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Commit | Line | Data |
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8d08fdba | 1 | /* Functions related to building classes and their related objects. |
06ceef4e RK |
2 | Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
3 | 1999, 2000 Free Software Foundation, Inc. | |
8d08fdba MS |
4 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
5 | ||
6 | This file is part of GNU CC. | |
7 | ||
8 | GNU CC is free software; you can redistribute it and/or modify | |
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 | ||
13 | GNU CC is distributed in the hope that it will be useful, | |
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 | |
19 | along with GNU CC; 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" |
e7a587ef | 28 | #include "tree.h" |
8d08fdba MS |
29 | #include "cp-tree.h" |
30 | #include "flags.h" | |
28cbf42c | 31 | #include "rtl.h" |
e8abc66f | 32 | #include "output.h" |
54f92bfb | 33 | #include "toplev.h" |
9cd64686 | 34 | #include "ggc.h" |
11028a53 | 35 | #include "lex.h" |
8d08fdba MS |
36 | |
37 | #include "obstack.h" | |
38 | #define obstack_chunk_alloc xmalloc | |
39 | #define obstack_chunk_free free | |
40 | ||
61a127b3 MM |
41 | /* The number of nested classes being processed. If we are not in the |
42 | scope of any class, this is zero. */ | |
43 | ||
8d08fdba MS |
44 | int current_class_depth; |
45 | ||
61a127b3 MM |
46 | /* In order to deal with nested classes, we keep a stack of classes. |
47 | The topmost entry is the innermost class, and is the entry at index | |
48 | CURRENT_CLASS_DEPTH */ | |
49 | ||
50 | typedef struct class_stack_node { | |
51 | /* The name of the class. */ | |
52 | tree name; | |
53 | ||
54 | /* The _TYPE node for the class. */ | |
55 | tree type; | |
56 | ||
57 | /* The access specifier pending for new declarations in the scope of | |
58 | this class. */ | |
59 | tree access; | |
8f032717 MM |
60 | |
61 | /* If were defining TYPE, the names used in this class. */ | |
62 | splay_tree names_used; | |
61a127b3 MM |
63 | }* class_stack_node_t; |
64 | ||
911a71a7 | 65 | typedef struct vtbl_init_data_s |
c35cce41 | 66 | { |
911a71a7 MM |
67 | /* The base for which we're building initializers. */ |
68 | tree binfo; | |
c35cce41 MM |
69 | /* The binfo for the most-derived type. */ |
70 | tree derived; | |
9bab6c90 MM |
71 | /* The negative-index vtable initializers built up so far. These |
72 | are in order from least negative index to most negative index. */ | |
73 | tree inits; | |
74 | /* The last (i.e., most negative entry in INITS. */ | |
75 | tree* last_init; | |
c35cce41 | 76 | /* The binfo for the virtual base for which we're building |
911a71a7 | 77 | vcall offset initializers. */ |
c35cce41 | 78 | tree vbase; |
9bab6c90 MM |
79 | /* The functions in vbase for which we have already provided vcall |
80 | offsets. */ | |
81 | varray_type fns; | |
c35cce41 MM |
82 | /* The vtable index of the next vcall or vbase offset. */ |
83 | tree index; | |
84 | /* Nonzero if we are building the initializer for the primary | |
85 | vtable. */ | |
911a71a7 MM |
86 | int primary_vtbl_p; |
87 | /* Nonzero if we are building the initializer for a construction | |
88 | vtable. */ | |
89 | int ctor_vtbl_p; | |
90 | } vtbl_init_data; | |
c35cce41 | 91 | |
61a127b3 MM |
92 | /* The stack itself. This is an dynamically resized array. The |
93 | number of elements allocated is CURRENT_CLASS_STACK_SIZE. */ | |
94 | static int current_class_stack_size; | |
95 | static class_stack_node_t current_class_stack; | |
96 | ||
1f6e1acc AS |
97 | /* An array of all local classes present in this translation unit, in |
98 | declaration order. */ | |
99 | varray_type local_classes; | |
100 | ||
158991b7 KG |
101 | static tree get_vfield_name PARAMS ((tree)); |
102 | static void finish_struct_anon PARAMS ((tree)); | |
103 | static tree build_vbase_pointer PARAMS ((tree, tree)); | |
31f8e4f3 | 104 | static tree build_vtable_entry PARAMS ((tree, tree, tree, int)); |
669ec2b4 | 105 | static tree get_vtable_name PARAMS ((tree)); |
158991b7 KG |
106 | static tree get_derived_offset PARAMS ((tree, tree)); |
107 | static tree get_basefndecls PARAMS ((tree, tree)); | |
28531dd0 MM |
108 | static int build_primary_vtable PARAMS ((tree, tree)); |
109 | static int build_secondary_vtable PARAMS ((tree, tree)); | |
158991b7 | 110 | static tree dfs_finish_vtbls PARAMS ((tree, void *)); |
23656158 MM |
111 | static tree dfs_accumulate_vtbl_inits PARAMS ((tree, tree, tree, tree, |
112 | tree)); | |
158991b7 | 113 | static void finish_vtbls PARAMS ((tree)); |
5e19c053 | 114 | static void modify_vtable_entry PARAMS ((tree, tree, tree, tree, tree *)); |
158991b7 KG |
115 | static void add_virtual_function PARAMS ((tree *, tree *, int *, tree, tree)); |
116 | static tree delete_duplicate_fields_1 PARAMS ((tree, tree)); | |
117 | static void delete_duplicate_fields PARAMS ((tree)); | |
118 | static void finish_struct_bits PARAMS ((tree)); | |
aa52c1ff | 119 | static int alter_access PARAMS ((tree, tree, tree)); |
158991b7 | 120 | static void handle_using_decl PARAMS ((tree, tree)); |
9bab6c90 | 121 | static int same_signature_p PARAMS ((tree, tree)); |
158991b7 | 122 | static int strictly_overrides PARAMS ((tree, tree)); |
158991b7 KG |
123 | static void mark_overriders PARAMS ((tree, tree)); |
124 | static void check_for_override PARAMS ((tree, tree)); | |
158991b7 KG |
125 | static tree dfs_modify_vtables PARAMS ((tree, void *)); |
126 | static tree modify_all_vtables PARAMS ((tree, int *, tree)); | |
127 | static void determine_primary_base PARAMS ((tree, int *)); | |
128 | static void finish_struct_methods PARAMS ((tree)); | |
129 | static void maybe_warn_about_overly_private_class PARAMS ((tree)); | |
130 | static int field_decl_cmp PARAMS ((const tree *, const tree *)); | |
131 | static int method_name_cmp PARAMS ((const tree *, const tree *)); | |
132 | static tree add_implicitly_declared_members PARAMS ((tree, int, int, int)); | |
133 | static tree fixed_type_or_null PARAMS ((tree, int *)); | |
134 | static tree resolve_address_of_overloaded_function PARAMS ((tree, tree, int, | |
19420d00 | 135 | int, int, tree)); |
158991b7 | 136 | static void build_vtable_entry_ref PARAMS ((tree, tree, tree)); |
aabb4cd6 | 137 | static tree build_vtbl_initializer PARAMS ((tree, tree, tree, tree, int *)); |
158991b7 KG |
138 | static int count_fields PARAMS ((tree)); |
139 | static int add_fields_to_vec PARAMS ((tree, tree, int)); | |
140 | static void check_bitfield_decl PARAMS ((tree)); | |
141 | static void check_field_decl PARAMS ((tree, tree, int *, int *, int *, int *)); | |
142 | static void check_field_decls PARAMS ((tree, tree *, int *, int *, int *, | |
607cf131 | 143 | int *)); |
5c24fba6 MM |
144 | static void build_base_field PARAMS ((record_layout_info, tree, int *, |
145 | unsigned int *, varray_type *)); | |
146 | static varray_type build_base_fields PARAMS ((record_layout_info, int *)); | |
147 | static tree build_vbase_pointer_fields PARAMS ((record_layout_info, int *)); | |
07a3462a JW |
148 | static tree build_vtbl_or_vbase_field PARAMS ((tree, tree, tree, tree, tree, |
149 | int *)); | |
158991b7 KG |
150 | static void check_methods PARAMS ((tree)); |
151 | static void remove_zero_width_bit_fields PARAMS ((tree)); | |
152 | static void check_bases PARAMS ((tree, int *, int *, int *)); | |
153 | static void check_bases_and_members PARAMS ((tree, int *)); | |
5c24fba6 | 154 | static tree create_vtable_ptr PARAMS ((tree, int *, int *, tree *, tree *)); |
158991b7 KG |
155 | static void layout_class_type PARAMS ((tree, int *, int *, tree *, tree *)); |
156 | static void fixup_pending_inline PARAMS ((struct pending_inline *)); | |
157 | static void fixup_inline_methods PARAMS ((tree)); | |
911a71a7 | 158 | static void set_primary_base PARAMS ((tree, tree, int *)); |
158991b7 | 159 | static void propagate_binfo_offsets PARAMS ((tree, tree)); |
9785e4b1 | 160 | static void layout_virtual_bases PARAMS ((tree, varray_type *)); |
158991b7 | 161 | static tree dfs_set_offset_for_unshared_vbases PARAMS ((tree, void *)); |
911a71a7 | 162 | static void build_vbase_offset_vtbl_entries PARAMS ((tree, vtbl_init_data *)); |
b485e15b MM |
163 | static void add_vcall_offset_vtbl_entries_r PARAMS ((tree, vtbl_init_data *)); |
164 | static void add_vcall_offset_vtbl_entries_1 PARAMS ((tree, vtbl_init_data *)); | |
911a71a7 | 165 | static void build_vcall_offset_vtbl_entries PARAMS ((tree, vtbl_init_data *)); |
158991b7 | 166 | static void layout_vtable_decl PARAMS ((tree, int)); |
5e19c053 MM |
167 | static tree dfs_find_final_overrider PARAMS ((tree, void *)); |
168 | static tree find_final_overrider PARAMS ((tree, tree, tree)); | |
28531dd0 | 169 | static int make_new_vtable PARAMS ((tree, tree)); |
c35cce41 MM |
170 | static void dump_class_hierarchy_r PARAMS ((tree, tree, int)); |
171 | extern void dump_class_hierarchy PARAMS ((tree)); | |
b9f39201 | 172 | static tree build_vtable PARAMS ((tree, tree, tree)); |
8d7a5379 | 173 | static void initialize_vtable PARAMS ((tree, tree)); |
23656158 | 174 | static void initialize_array PARAMS ((tree, tree)); |
5c24fba6 MM |
175 | static void layout_nonempty_base_or_field PARAMS ((record_layout_info, |
176 | tree, tree, | |
177 | varray_type)); | |
9785e4b1 MM |
178 | static tree dfs_record_base_offsets PARAMS ((tree, void *)); |
179 | static void record_base_offsets PARAMS ((tree, varray_type *)); | |
180 | static tree dfs_search_base_offsets PARAMS ((tree, void *)); | |
181 | static int layout_conflict_p PARAMS ((tree, varray_type)); | |
182 | static unsigned HOST_WIDE_INT end_of_class PARAMS ((tree, int)); | |
183 | static void layout_empty_base PARAMS ((tree, tree, varray_type)); | |
23656158 | 184 | static void accumulate_vtbl_inits PARAMS ((tree, tree, tree, tree, tree)); |
da3d4dfa | 185 | static void set_vindex PARAMS ((tree, tree, int *)); |
911a71a7 | 186 | static void build_rtti_vtbl_entries PARAMS ((tree, tree, vtbl_init_data *)); |
c35cce41 | 187 | static void build_vcall_and_vbase_vtbl_entries PARAMS ((tree, |
911a71a7 | 188 | vtbl_init_data *)); |
c35cce41 MM |
189 | static tree dfs_mark_primary_bases PARAMS ((tree, void *)); |
190 | static void mark_primary_bases PARAMS ((tree)); | |
db9b2174 MM |
191 | static void clone_constructors_and_destructors PARAMS ((tree)); |
192 | static tree build_clone PARAMS ((tree, tree)); | |
1cea0434 | 193 | static void update_vtable_entry_for_fn PARAMS ((tree, tree, tree, tree *)); |
aabb4cd6 | 194 | static tree copy_virtuals PARAMS ((tree)); |
23656158 MM |
195 | static void build_ctor_vtbl_group PARAMS ((tree, tree)); |
196 | static void build_vtt PARAMS ((tree)); | |
9ccf6541 MM |
197 | static tree *build_vtt_inits PARAMS ((tree, tree, int, tree *, tree *)); |
198 | static tree dfs_build_secondary_vptr_vtt_inits PARAMS ((tree, void *)); | |
23656158 | 199 | static tree dfs_fixup_binfo_vtbls PARAMS ((tree, void *)); |
9ccf6541 | 200 | static tree get_matching_base PARAMS ((tree, tree)); |
911a71a7 | 201 | static tree dfs_get_primary_binfo PARAMS ((tree, void*)); |
8d08fdba | 202 | |
51c184be | 203 | /* Variables shared between class.c and call.c. */ |
8d08fdba | 204 | |
5566b478 | 205 | #ifdef GATHER_STATISTICS |
8d08fdba MS |
206 | int n_vtables = 0; |
207 | int n_vtable_entries = 0; | |
208 | int n_vtable_searches = 0; | |
209 | int n_vtable_elems = 0; | |
210 | int n_convert_harshness = 0; | |
211 | int n_compute_conversion_costs = 0; | |
212 | int n_build_method_call = 0; | |
213 | int n_inner_fields_searched = 0; | |
5566b478 | 214 | #endif |
8d08fdba | 215 | |
f8361147 MM |
216 | /* Virtual base class layout. */ |
217 | ||
218 | /* Returns a list of virtual base class pointers as a chain of | |
219 | FIELD_DECLS. */ | |
e92cc029 | 220 | |
bd6dd845 | 221 | static tree |
5c24fba6 MM |
222 | build_vbase_pointer_fields (rli, empty_p) |
223 | record_layout_info rli; | |
f8361147 | 224 | int *empty_p; |
8d08fdba | 225 | { |
f8361147 MM |
226 | /* Chain to hold all the new FIELD_DECLs which point at virtual |
227 | base classes. */ | |
5c24fba6 | 228 | tree rec = rli->t; |
f8361147 MM |
229 | tree vbase_decls = NULL_TREE; |
230 | tree binfos = TYPE_BINFO_BASETYPES (rec); | |
231 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec); | |
232 | tree decl; | |
233 | int i; | |
8d08fdba | 234 | |
bbd15aac MM |
235 | /* Under the new ABI, there are no vbase pointers in the object. |
236 | Instead, the offsets are stored in the vtable. */ | |
237 | if (vbase_offsets_in_vtable_p ()) | |
238 | return NULL_TREE; | |
f8361147 | 239 | |
bbd15aac | 240 | /* Loop over the baseclasses, adding vbase pointers as needed. */ |
f8361147 MM |
241 | for (i = 0; i < n_baseclasses; i++) |
242 | { | |
243 | register tree base_binfo = TREE_VEC_ELT (binfos, i); | |
244 | register tree basetype = BINFO_TYPE (base_binfo); | |
245 | ||
d0f062fb | 246 | if (!COMPLETE_TYPE_P (basetype)) |
f8361147 MM |
247 | /* This error is now reported in xref_tag, thus giving better |
248 | location information. */ | |
249 | continue; | |
250 | ||
251 | /* All basetypes are recorded in the association list of the | |
252 | derived type. */ | |
253 | ||
254 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
255 | { | |
256 | int j; | |
257 | const char *name; | |
258 | ||
259 | /* The offset for a virtual base class is only used in computing | |
260 | virtual function tables and for initializing virtual base | |
261 | pointers. It is built once `get_vbase_types' is called. */ | |
262 | ||
263 | /* If this basetype can come from another vbase pointer | |
264 | without an additional indirection, we will share | |
265 | that pointer. If an indirection is involved, we | |
266 | make our own pointer. */ | |
267 | for (j = 0; j < n_baseclasses; j++) | |
268 | { | |
269 | tree other_base_binfo = TREE_VEC_ELT (binfos, j); | |
270 | if (! TREE_VIA_VIRTUAL (other_base_binfo) | |
a55583e9 | 271 | && binfo_for_vbase (basetype, BINFO_TYPE (other_base_binfo))) |
f8361147 MM |
272 | goto got_it; |
273 | } | |
274 | FORMAT_VBASE_NAME (name, basetype); | |
275 | decl = build_vtbl_or_vbase_field (get_identifier (name), | |
276 | get_identifier (VTABLE_BASE), | |
277 | build_pointer_type (basetype), | |
278 | rec, | |
07a3462a | 279 | basetype, |
f8361147 MM |
280 | empty_p); |
281 | BINFO_VPTR_FIELD (base_binfo) = decl; | |
282 | TREE_CHAIN (decl) = vbase_decls; | |
770ae6cc | 283 | place_field (rli, decl); |
f8361147 MM |
284 | vbase_decls = decl; |
285 | *empty_p = 0; | |
286 | ||
287 | got_it: | |
288 | /* The space this decl occupies has already been accounted for. */ | |
289 | ; | |
290 | } | |
291 | } | |
292 | ||
293 | return vbase_decls; | |
8d08fdba MS |
294 | } |
295 | ||
ca36f057 MM |
296 | /* Returns a pointer to the virtual base class of EXP that has the |
297 | indicated TYPE. EXP is of class type, not a pointer type. */ | |
e92cc029 | 298 | |
f8361147 | 299 | static tree |
ca36f057 MM |
300 | build_vbase_pointer (exp, type) |
301 | tree exp, type; | |
8d08fdba | 302 | { |
ca36f057 | 303 | if (vbase_offsets_in_vtable_p ()) |
8d08fdba | 304 | { |
bbd15aac | 305 | tree vbase; |
ca36f057 | 306 | tree vbase_ptr; |
bbd15aac | 307 | |
ca36f057 MM |
308 | /* Find the shared copy of TYPE; that's where the vtable offset |
309 | is recorded. */ | |
a55583e9 | 310 | vbase = binfo_for_vbase (type, TREE_TYPE (exp)); |
ca36f057 MM |
311 | /* Find the virtual function table pointer. */ |
312 | vbase_ptr = build_vfield_ref (exp, TREE_TYPE (exp)); | |
313 | /* Compute the location where the offset will lie. */ | |
c35cce41 MM |
314 | vbase_ptr = build (PLUS_EXPR, |
315 | TREE_TYPE (vbase_ptr), | |
316 | vbase_ptr, | |
317 | BINFO_VPTR_FIELD (vbase)); | |
ca36f057 MM |
318 | vbase_ptr = build1 (NOP_EXPR, |
319 | build_pointer_type (ptrdiff_type_node), | |
320 | vbase_ptr); | |
321 | /* Add the contents of this location to EXP. */ | |
322 | return build (PLUS_EXPR, | |
323 | build_pointer_type (type), | |
324 | build_unary_op (ADDR_EXPR, exp, /*noconvert=*/0), | |
325 | build1 (INDIRECT_REF, ptrdiff_type_node, vbase_ptr)); | |
f8361147 | 326 | } |
ca36f057 | 327 | else |
f8361147 | 328 | { |
ca36f057 MM |
329 | char *name; |
330 | FORMAT_VBASE_NAME (name, type); | |
331 | return build_component_ref (exp, get_identifier (name), NULL_TREE, 0); | |
f8361147 | 332 | } |
f8361147 MM |
333 | } |
334 | ||
ca36f057 MM |
335 | /* Build multi-level access to EXPR using hierarchy path PATH. |
336 | CODE is PLUS_EXPR if we are going with the grain, | |
337 | and MINUS_EXPR if we are not (in which case, we cannot traverse | |
338 | virtual baseclass links). | |
1a588ad7 | 339 | |
ca36f057 | 340 | TYPE is the type we want this path to have on exit. |
1a588ad7 | 341 | |
ca36f057 MM |
342 | NONNULL is non-zero if we know (for any reason) that EXPR is |
343 | not, in fact, zero. */ | |
344 | ||
345 | tree | |
346 | build_vbase_path (code, type, expr, path, nonnull) | |
347 | enum tree_code code; | |
348 | tree type, expr, path; | |
349 | int nonnull; | |
1a588ad7 | 350 | { |
ca36f057 MM |
351 | register int changed = 0; |
352 | tree last = NULL_TREE, last_virtual = NULL_TREE; | |
353 | int fixed_type_p; | |
354 | tree null_expr = 0, nonnull_expr; | |
355 | tree basetype; | |
356 | tree offset = integer_zero_node; | |
1a588ad7 | 357 | |
ca36f057 MM |
358 | if (BINFO_INHERITANCE_CHAIN (path) == NULL_TREE) |
359 | return build1 (NOP_EXPR, type, expr); | |
1a588ad7 | 360 | |
ca36f057 MM |
361 | /* We could do better if we had additional logic to convert back to the |
362 | unconverted type (the static type of the complete object), and then | |
363 | convert back to the type we want. Until that is done, we only optimize | |
364 | if the complete type is the same type as expr has. */ | |
365 | fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull); | |
1a588ad7 | 366 | |
ca36f057 MM |
367 | if (!fixed_type_p && TREE_SIDE_EFFECTS (expr)) |
368 | expr = save_expr (expr); | |
369 | nonnull_expr = expr; | |
1a588ad7 | 370 | |
ca36f057 | 371 | path = reverse_path (path); |
1a588ad7 | 372 | |
ca36f057 | 373 | basetype = BINFO_TYPE (path); |
1a588ad7 | 374 | |
ca36f057 | 375 | while (path) |
1a588ad7 | 376 | { |
ca36f057 MM |
377 | if (TREE_VIA_VIRTUAL (TREE_VALUE (path))) |
378 | { | |
379 | last_virtual = BINFO_TYPE (TREE_VALUE (path)); | |
380 | if (code == PLUS_EXPR) | |
381 | { | |
382 | changed = ! fixed_type_p; | |
fed3cef0 | 383 | |
ca36f057 MM |
384 | if (changed) |
385 | { | |
386 | tree ind; | |
1a588ad7 | 387 | |
ca36f057 MM |
388 | /* We already check for ambiguous things in the caller, just |
389 | find a path. */ | |
390 | if (last) | |
391 | { | |
392 | tree binfo = get_binfo (last, TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (nonnull_expr))), 0); | |
393 | nonnull_expr = convert_pointer_to_real (binfo, nonnull_expr); | |
394 | } | |
395 | ind = build_indirect_ref (nonnull_expr, NULL_PTR); | |
396 | nonnull_expr = build_vbase_pointer (ind, last_virtual); | |
397 | if (nonnull == 0 | |
398 | && TREE_CODE (type) == POINTER_TYPE | |
399 | && null_expr == NULL_TREE) | |
400 | { | |
401 | null_expr = build1 (NOP_EXPR, build_pointer_type (last_virtual), integer_zero_node); | |
402 | expr = build (COND_EXPR, build_pointer_type (last_virtual), | |
403 | build (EQ_EXPR, boolean_type_node, expr, | |
404 | integer_zero_node), | |
405 | null_expr, nonnull_expr); | |
406 | } | |
407 | } | |
408 | /* else we'll figure out the offset below. */ | |
1a588ad7 | 409 | |
ca36f057 MM |
410 | /* Happens in the case of parse errors. */ |
411 | if (nonnull_expr == error_mark_node) | |
412 | return error_mark_node; | |
413 | } | |
414 | else | |
415 | { | |
416 | cp_error ("cannot cast up from virtual baseclass `%T'", | |
417 | last_virtual); | |
418 | return error_mark_node; | |
419 | } | |
420 | } | |
421 | last = TREE_VALUE (path); | |
422 | path = TREE_CHAIN (path); | |
423 | } | |
424 | /* LAST is now the last basetype assoc on the path. */ | |
8d08fdba MS |
425 | |
426 | /* A pointer to a virtual base member of a non-null object | |
427 | is non-null. Therefore, we only need to test for zeroness once. | |
428 | Make EXPR the canonical expression to deal with here. */ | |
429 | if (null_expr) | |
430 | { | |
431 | TREE_OPERAND (expr, 2) = nonnull_expr; | |
b9ddcfac JM |
432 | TREE_TYPE (expr) = TREE_TYPE (TREE_OPERAND (expr, 1)) |
433 | = TREE_TYPE (nonnull_expr); | |
8d08fdba MS |
434 | } |
435 | else | |
436 | expr = nonnull_expr; | |
437 | ||
438 | /* If we go through any virtual base pointers, make sure that | |
439 | casts to BASETYPE from the last virtual base class use | |
440 | the right value for BASETYPE. */ | |
441 | if (changed) | |
442 | { | |
443 | tree intype = TREE_TYPE (TREE_TYPE (expr)); | |
fed3cef0 | 444 | |
f30432d7 | 445 | if (TYPE_MAIN_VARIANT (intype) != BINFO_TYPE (last)) |
fed3cef0 RK |
446 | offset |
447 | = BINFO_OFFSET (get_binfo (last, TYPE_MAIN_VARIANT (intype), 0)); | |
8d08fdba MS |
448 | } |
449 | else | |
9d4c0187 | 450 | offset = BINFO_OFFSET (last); |
8d08fdba | 451 | |
665f2503 | 452 | if (! integer_zerop (offset)) |
8d08fdba | 453 | { |
59be85d7 | 454 | /* Bash types to make the backend happy. */ |
37c46b43 | 455 | offset = cp_convert (type, offset); |
59be85d7 | 456 | |
51ddb82e | 457 | /* If expr might be 0, we need to preserve that zeroness. */ |
f30432d7 | 458 | if (nonnull == 0) |
8d08fdba MS |
459 | { |
460 | if (null_expr) | |
461 | TREE_TYPE (null_expr) = type; | |
462 | else | |
463 | null_expr = build1 (NOP_EXPR, type, integer_zero_node); | |
464 | if (TREE_SIDE_EFFECTS (expr)) | |
465 | expr = save_expr (expr); | |
466 | ||
467 | return build (COND_EXPR, type, | |
b7484fbe | 468 | build (EQ_EXPR, boolean_type_node, expr, integer_zero_node), |
8d08fdba MS |
469 | null_expr, |
470 | build (code, type, expr, offset)); | |
471 | } | |
472 | else return build (code, type, expr, offset); | |
473 | } | |
474 | ||
475 | /* Cannot change the TREE_TYPE of a NOP_EXPR here, since it may | |
476 | be used multiple times in initialization of multiple inheritance. */ | |
477 | if (null_expr) | |
478 | { | |
479 | TREE_TYPE (expr) = type; | |
480 | return expr; | |
481 | } | |
482 | else | |
483 | return build1 (NOP_EXPR, type, expr); | |
484 | } | |
485 | ||
f8361147 | 486 | \f |
8d08fdba MS |
487 | /* Virtual function things. */ |
488 | ||
a1dd0d36 JM |
489 | /* We want to give the assembler the vtable identifier as well as |
490 | the offset to the function pointer. So we generate | |
491 | ||
59fa060f | 492 | __asm__ __volatile__ (".vtable_entry %c0, %c1" |
a1dd0d36 JM |
493 | : : "s"(&class_vtable), |
494 | "i"((long)&vtbl[idx].pfn - (long)&vtbl[0])); */ | |
495 | ||
496 | static void | |
497 | build_vtable_entry_ref (basetype, vtbl, idx) | |
498 | tree basetype, vtbl, idx; | |
499 | { | |
59fa060f | 500 | static char asm_stmt[] = ".vtable_entry %c0, %c1"; |
a1dd0d36 JM |
501 | tree s, i, i2; |
502 | ||
344e498c MM |
503 | s = build_unary_op (ADDR_EXPR, |
504 | get_vtbl_decl_for_binfo (TYPE_BINFO (basetype)), | |
505 | 0); | |
a1dd0d36 JM |
506 | s = build_tree_list (build_string (1, "s"), s); |
507 | ||
508 | i = build_array_ref (vtbl, idx); | |
509 | if (!flag_vtable_thunks) | |
510 | i = build_component_ref (i, pfn_identifier, vtable_entry_type, 0); | |
511 | i = build_c_cast (ptrdiff_type_node, build_unary_op (ADDR_EXPR, i, 0)); | |
512 | i2 = build_array_ref (vtbl, build_int_2(0,0)); | |
513 | i2 = build_c_cast (ptrdiff_type_node, build_unary_op (ADDR_EXPR, i2, 0)); | |
ab76ca54 | 514 | i = cp_build_binary_op (MINUS_EXPR, i, i2); |
a1dd0d36 JM |
515 | i = build_tree_list (build_string (1, "i"), i); |
516 | ||
11028a53 JM |
517 | finish_asm_stmt (ridpointers[RID_VOLATILE], |
518 | build_string (sizeof(asm_stmt)-1, asm_stmt), | |
519 | NULL_TREE, chainon (s, i), NULL_TREE); | |
a1dd0d36 JM |
520 | } |
521 | ||
8d08fdba | 522 | /* Given an object INSTANCE, return an expression which yields the |
6b5fbb55 MS |
523 | virtual function vtable element corresponding to INDEX. There are |
524 | many special cases for INSTANCE which we take care of here, mainly | |
525 | to avoid creating extra tree nodes when we don't have to. */ | |
e92cc029 | 526 | |
8d08fdba | 527 | tree |
6b5fbb55 MS |
528 | build_vtbl_ref (instance, idx) |
529 | tree instance, idx; | |
8d08fdba | 530 | { |
8d08fdba MS |
531 | tree vtbl, aref; |
532 | tree basetype = TREE_TYPE (instance); | |
533 | ||
534 | if (TREE_CODE (basetype) == REFERENCE_TYPE) | |
535 | basetype = TREE_TYPE (basetype); | |
536 | ||
4ac14744 | 537 | if (instance == current_class_ref) |
849da744 | 538 | vtbl = build_vfield_ref (instance, basetype); |
8d08fdba MS |
539 | else |
540 | { | |
541 | if (optimize) | |
542 | { | |
543 | /* Try to figure out what a reference refers to, and | |
544 | access its virtual function table directly. */ | |
545 | tree ref = NULL_TREE; | |
546 | ||
547 | if (TREE_CODE (instance) == INDIRECT_REF | |
548 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (instance, 0))) == REFERENCE_TYPE) | |
549 | ref = TREE_OPERAND (instance, 0); | |
550 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) | |
551 | ref = instance; | |
552 | ||
553 | if (ref && TREE_CODE (ref) == VAR_DECL | |
554 | && DECL_INITIAL (ref)) | |
555 | { | |
556 | tree init = DECL_INITIAL (ref); | |
557 | ||
558 | while (TREE_CODE (init) == NOP_EXPR | |
559 | || TREE_CODE (init) == NON_LVALUE_EXPR) | |
560 | init = TREE_OPERAND (init, 0); | |
561 | if (TREE_CODE (init) == ADDR_EXPR) | |
562 | { | |
563 | init = TREE_OPERAND (init, 0); | |
564 | if (IS_AGGR_TYPE (TREE_TYPE (init)) | |
565 | && (TREE_CODE (init) == PARM_DECL | |
566 | || TREE_CODE (init) == VAR_DECL)) | |
567 | instance = init; | |
568 | } | |
569 | } | |
570 | } | |
571 | ||
572 | if (IS_AGGR_TYPE (TREE_TYPE (instance)) | |
8d08fdba MS |
573 | && (TREE_CODE (instance) == RESULT_DECL |
574 | || TREE_CODE (instance) == PARM_DECL | |
575 | || TREE_CODE (instance) == VAR_DECL)) | |
c35cce41 MM |
576 | { |
577 | vtbl = TYPE_BINFO_VTABLE (basetype); | |
578 | /* Knowing the dynamic type of INSTANCE we can easily obtain | |
579 | the correct vtable entry. In the new ABI, we resolve | |
580 | this back to be in terms of the primary vtable. */ | |
581 | if (TREE_CODE (vtbl) == PLUS_EXPR) | |
582 | { | |
583 | idx = fold (build (PLUS_EXPR, | |
584 | TREE_TYPE (idx), | |
585 | idx, | |
586 | build (EXACT_DIV_EXPR, | |
587 | TREE_TYPE (idx), | |
588 | TREE_OPERAND (vtbl, 1), | |
589 | TYPE_SIZE_UNIT (vtable_entry_type)))); | |
590 | vtbl = get_vtbl_decl_for_binfo (TYPE_BINFO (basetype)); | |
591 | } | |
592 | } | |
8d08fdba | 593 | else |
849da744 | 594 | vtbl = build_vfield_ref (instance, basetype); |
8d08fdba | 595 | } |
a1dd0d36 | 596 | |
e3417fcd | 597 | assemble_external (vtbl); |
a1dd0d36 JM |
598 | |
599 | if (flag_vtable_gc) | |
600 | build_vtable_entry_ref (basetype, vtbl, idx); | |
601 | ||
8d08fdba MS |
602 | aref = build_array_ref (vtbl, idx); |
603 | ||
6b5fbb55 MS |
604 | return aref; |
605 | } | |
606 | ||
607 | /* Given an object INSTANCE, return an expression which yields the | |
608 | virtual function corresponding to INDEX. There are many special | |
609 | cases for INSTANCE which we take care of here, mainly to avoid | |
610 | creating extra tree nodes when we don't have to. */ | |
e92cc029 | 611 | |
6b5fbb55 MS |
612 | tree |
613 | build_vfn_ref (ptr_to_instptr, instance, idx) | |
614 | tree *ptr_to_instptr, instance; | |
615 | tree idx; | |
616 | { | |
617 | tree aref = build_vtbl_ref (instance, idx); | |
8d08fdba | 618 | |
6b5fbb55 MS |
619 | /* When using thunks, there is no extra delta, and we get the pfn |
620 | directly. */ | |
8926095f MS |
621 | if (flag_vtable_thunks) |
622 | return aref; | |
6b5fbb55 MS |
623 | |
624 | if (ptr_to_instptr) | |
8926095f | 625 | { |
6b5fbb55 MS |
626 | /* Save the intermediate result in a SAVE_EXPR so we don't have to |
627 | compute each component of the virtual function pointer twice. */ | |
628 | if (TREE_CODE (aref) == INDIRECT_REF) | |
629 | TREE_OPERAND (aref, 0) = save_expr (TREE_OPERAND (aref, 0)); | |
630 | ||
631 | *ptr_to_instptr | |
632 | = build (PLUS_EXPR, TREE_TYPE (*ptr_to_instptr), | |
633 | *ptr_to_instptr, | |
37c46b43 MS |
634 | cp_convert (ptrdiff_type_node, |
635 | build_component_ref (aref, delta_identifier, NULL_TREE, 0))); | |
8926095f | 636 | } |
6b5fbb55 MS |
637 | |
638 | return build_component_ref (aref, pfn_identifier, NULL_TREE, 0); | |
8d08fdba MS |
639 | } |
640 | ||
669ec2b4 JM |
641 | /* Return the name of the virtual function table (as an IDENTIFIER_NODE) |
642 | for the given TYPE. */ | |
643 | ||
644 | static tree | |
645 | get_vtable_name (type) | |
646 | tree type; | |
647 | { | |
648 | if (flag_new_abi) | |
649 | return mangle_vtbl_for_type (type); | |
650 | else | |
651 | return build_overload_with_type (get_identifier (VTABLE_NAME_PREFIX), | |
652 | type); | |
653 | } | |
654 | ||
655 | /* Return an IDENTIFIER_NODE for the name of the virtual table table | |
656 | for TYPE. */ | |
657 | ||
658 | tree | |
659 | get_vtt_name (type) | |
660 | tree type; | |
661 | { | |
662 | if (flag_new_abi) | |
663 | return mangle_vtt_for_type (type); | |
664 | else | |
665 | return build_overload_with_type (get_identifier (VTT_NAME_PREFIX), | |
666 | type); | |
667 | } | |
668 | ||
6b5fbb55 | 669 | /* Return the offset to the main vtable for a given base BINFO. */ |
e92cc029 | 670 | |
6b5fbb55 MS |
671 | tree |
672 | get_vfield_offset (binfo) | |
673 | tree binfo; | |
674 | { | |
770ae6cc RK |
675 | return |
676 | size_binop (PLUS_EXPR, byte_position (TYPE_VFIELD (BINFO_TYPE (binfo))), | |
677 | BINFO_OFFSET (binfo)); | |
6b5fbb55 MS |
678 | } |
679 | ||
680 | /* Get the offset to the start of the original binfo that we derived | |
681 | this binfo from. If we find TYPE first, return the offset only | |
682 | that far. The shortened search is useful because the this pointer | |
683 | on method calling is expected to point to a DECL_CONTEXT (fndecl) | |
fed3cef0 RK |
684 | object, and not a baseclass of it. */ |
685 | ||
6b5fbb55 MS |
686 | static tree |
687 | get_derived_offset (binfo, type) | |
688 | tree binfo, type; | |
689 | { | |
690 | tree offset1 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo))); | |
691 | tree offset2; | |
fed3cef0 | 692 | |
31f8e4f3 | 693 | while (!same_type_p (BINFO_TYPE (binfo), type)) |
911a71a7 | 694 | binfo = get_primary_binfo (binfo); |
fed3cef0 | 695 | |
6b5fbb55 MS |
696 | offset2 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo))); |
697 | return size_binop (MINUS_EXPR, offset1, offset2); | |
698 | } | |
699 | ||
459c43ad MM |
700 | /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE. |
701 | (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.) | |
702 | Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */ | |
b9f39201 MM |
703 | |
704 | static tree | |
705 | build_vtable (class_type, name, vtable_type) | |
706 | tree class_type; | |
707 | tree name; | |
708 | tree vtable_type; | |
709 | { | |
710 | tree decl; | |
711 | ||
712 | decl = build_lang_decl (VAR_DECL, name, vtable_type); | |
713 | DECL_CONTEXT (decl) = class_type; | |
714 | DECL_ARTIFICIAL (decl) = 1; | |
715 | TREE_STATIC (decl) = 1; | |
716 | #ifndef WRITABLE_VTABLES | |
717 | /* Make them READONLY by default. (mrs) */ | |
718 | TREE_READONLY (decl) = 1; | |
719 | #endif | |
720 | DECL_VIRTUAL_P (decl) = 1; | |
721 | import_export_vtable (decl, class_type, 0); | |
722 | ||
723 | return decl; | |
724 | } | |
725 | ||
1aa4ccd4 NS |
726 | /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic, |
727 | or even complete. If this does not exist, create it. If COMPLETE is | |
728 | non-zero, then complete the definition of it -- that will render it | |
729 | impossible to actually build the vtable, but is useful to get at those | |
730 | which are known to exist in the runtime. */ | |
731 | ||
7d52ae23 MM |
732 | tree |
733 | get_vtable_decl (type, complete) | |
1aa4ccd4 NS |
734 | tree type; |
735 | int complete; | |
736 | { | |
669ec2b4 | 737 | tree name = get_vtable_name (type); |
1aa4ccd4 NS |
738 | tree decl = IDENTIFIER_GLOBAL_VALUE (name); |
739 | ||
740 | if (decl) | |
741 | { | |
742 | my_friendly_assert (TREE_CODE (decl) == VAR_DECL | |
743 | && DECL_VIRTUAL_P (decl), 20000118); | |
744 | return decl; | |
745 | } | |
746 | ||
b9f39201 | 747 | decl = build_vtable (type, name, void_type_node); |
1aa4ccd4 | 748 | decl = pushdecl_top_level (decl); |
23656158 MM |
749 | my_friendly_assert (IDENTIFIER_GLOBAL_VALUE (name) == decl, |
750 | 20000517); | |
1aa4ccd4 | 751 | |
1aa4ccd4 NS |
752 | /* At one time the vtable info was grabbed 2 words at a time. This |
753 | fails on sparc unless you have 8-byte alignment. (tiemann) */ | |
754 | DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node), | |
755 | DECL_ALIGN (decl)); | |
756 | ||
1aa4ccd4 | 757 | if (complete) |
217f4eb9 MM |
758 | { |
759 | DECL_EXTERNAL (decl) = 1; | |
760 | cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0); | |
761 | } | |
1aa4ccd4 | 762 | |
1aa4ccd4 NS |
763 | return decl; |
764 | } | |
765 | ||
aabb4cd6 MM |
766 | /* Returns a copy of the BINFO_VIRTUALS list in BINFO. The |
767 | BV_VCALL_INDEX for each entry is cleared. */ | |
768 | ||
769 | static tree | |
770 | copy_virtuals (binfo) | |
771 | tree binfo; | |
772 | { | |
773 | tree copies; | |
774 | tree t; | |
775 | ||
776 | copies = copy_list (BINFO_VIRTUALS (binfo)); | |
777 | for (t = copies; t; t = TREE_CHAIN (t)) | |
31f8e4f3 MM |
778 | { |
779 | BV_VCALL_INDEX (t) = NULL_TREE; | |
780 | BV_USE_VCALL_INDEX_P (t) = 0; | |
781 | BV_GENERATE_THUNK_WITH_VTABLE_P (t) = 0; | |
782 | } | |
aabb4cd6 MM |
783 | |
784 | return copies; | |
785 | } | |
786 | ||
28531dd0 MM |
787 | /* Build the primary virtual function table for TYPE. If BINFO is |
788 | non-NULL, build the vtable starting with the initial approximation | |
789 | that it is the same as the one which is the head of the association | |
790 | list. Returns a non-zero value if a new vtable is actually | |
791 | created. */ | |
e92cc029 | 792 | |
28531dd0 MM |
793 | static int |
794 | build_primary_vtable (binfo, type) | |
8d08fdba MS |
795 | tree binfo, type; |
796 | { | |
31f8e4f3 MM |
797 | tree decl; |
798 | tree virtuals; | |
8d08fdba | 799 | |
1aa4ccd4 NS |
800 | decl = get_vtable_decl (type, /*complete=*/0); |
801 | ||
8d08fdba MS |
802 | if (binfo) |
803 | { | |
3c9d6359 | 804 | if (BINFO_NEW_VTABLE_MARKED (binfo, type)) |
0533d788 MM |
805 | /* We have already created a vtable for this base, so there's |
806 | no need to do it again. */ | |
28531dd0 MM |
807 | return 0; |
808 | ||
aabb4cd6 | 809 | virtuals = copy_virtuals (binfo); |
c35cce41 MM |
810 | TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo)); |
811 | DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl)); | |
812 | DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl)); | |
8d08fdba MS |
813 | } |
814 | else | |
815 | { | |
1aa4ccd4 NS |
816 | my_friendly_assert (TREE_CODE (TREE_TYPE (decl)) == VOID_TYPE, |
817 | 20000118); | |
8d08fdba | 818 | virtuals = NULL_TREE; |
8d08fdba MS |
819 | } |
820 | ||
821 | #ifdef GATHER_STATISTICS | |
822 | n_vtables += 1; | |
823 | n_vtable_elems += list_length (virtuals); | |
824 | #endif | |
825 | ||
8d08fdba MS |
826 | /* Initialize the association list for this type, based |
827 | on our first approximation. */ | |
828 | TYPE_BINFO_VTABLE (type) = decl; | |
829 | TYPE_BINFO_VIRTUALS (type) = virtuals; | |
31f8e4f3 | 830 | SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type), type); |
28531dd0 | 831 | return 1; |
8d08fdba MS |
832 | } |
833 | ||
8d08fdba MS |
834 | /* Give TYPE a new virtual function table which is initialized |
835 | with a skeleton-copy of its original initialization. The only | |
836 | entry that changes is the `delta' entry, so we can really | |
837 | share a lot of structure. | |
838 | ||
839 | FOR_TYPE is the derived type which caused this table to | |
840 | be needed. | |
841 | ||
2636fde4 JM |
842 | BINFO is the type association which provided TYPE for FOR_TYPE. |
843 | ||
844 | The order in which vtables are built (by calling this function) for | |
845 | an object must remain the same, otherwise a binary incompatibility | |
846 | can result. */ | |
e92cc029 | 847 | |
28531dd0 MM |
848 | static int |
849 | build_secondary_vtable (binfo, for_type) | |
7177d104 | 850 | tree binfo, for_type; |
8d08fdba | 851 | { |
2636fde4 | 852 | tree basetype; |
8d08fdba | 853 | tree orig_decl = BINFO_VTABLE (binfo); |
2636fde4 JM |
854 | tree name; |
855 | tree new_decl; | |
5566b478 | 856 | tree offset; |
2636fde4 JM |
857 | tree path = binfo; |
858 | char *buf, *buf2; | |
859 | char joiner = '_'; | |
860 | int i; | |
861 | ||
862 | #ifdef JOINER | |
863 | joiner = JOINER; | |
864 | #endif | |
865 | ||
8d7a5379 | 866 | if (TREE_VIA_VIRTUAL (binfo)) |
a55583e9 | 867 | my_friendly_assert (binfo == binfo_for_vbase (BINFO_TYPE (binfo), |
8d7a5379 MM |
868 | current_class_type), |
869 | 170); | |
870 | ||
3c9d6359 | 871 | if (BINFO_NEW_VTABLE_MARKED (binfo, current_class_type)) |
0533d788 MM |
872 | /* We already created a vtable for this base. There's no need to |
873 | do it again. */ | |
28531dd0 | 874 | return 0; |
0533d788 | 875 | |
8d7a5379 MM |
876 | /* Remember that we've created a vtable for this BINFO, so that we |
877 | don't try to do so again. */ | |
3c9d6359 | 878 | SET_BINFO_NEW_VTABLE_MARKED (binfo, current_class_type); |
8d7a5379 MM |
879 | |
880 | /* Make fresh virtual list, so we can smash it later. */ | |
aabb4cd6 | 881 | BINFO_VIRTUALS (binfo) = copy_virtuals (binfo); |
8d7a5379 MM |
882 | |
883 | if (TREE_VIA_VIRTUAL (binfo)) | |
884 | { | |
a55583e9 | 885 | tree binfo1 = binfo_for_vbase (BINFO_TYPE (binfo), for_type); |
8d7a5379 MM |
886 | |
887 | /* XXX - This should never happen, if it does, the caller should | |
888 | ensure that the binfo is from for_type's binfos, not from any | |
889 | base type's. We can remove all this code after a while. */ | |
890 | if (binfo1 != binfo) | |
891 | warning ("internal inconsistency: binfo offset error for rtti"); | |
892 | ||
893 | offset = BINFO_OFFSET (binfo1); | |
894 | } | |
895 | else | |
896 | offset = BINFO_OFFSET (binfo); | |
897 | ||
8d7a5379 MM |
898 | /* In the new ABI, secondary vtables are laid out as part of the |
899 | same structure as the primary vtable. */ | |
900 | if (merge_primary_and_secondary_vtables_p ()) | |
901 | { | |
902 | BINFO_VTABLE (binfo) = NULL_TREE; | |
903 | return 1; | |
904 | } | |
2636fde4 | 905 | |
8d7a5379 MM |
906 | /* Create the declaration for the secondary vtable. */ |
907 | basetype = TYPE_MAIN_VARIANT (BINFO_TYPE (binfo)); | |
2636fde4 JM |
908 | buf2 = TYPE_ASSEMBLER_NAME_STRING (basetype); |
909 | i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1; | |
910 | ||
911 | /* We know that the vtable that we are going to create doesn't exist | |
912 | yet in the global namespace, and when we finish, it will be | |
913 | pushed into the global namespace. In complex MI hierarchies, we | |
914 | have to loop while the name we are thinking of adding is globally | |
915 | defined, adding more name components to the vtable name as we | |
916 | loop, until the name is unique. This is because in complex MI | |
917 | cases, we might have the same base more than once. This means | |
918 | that the order in which this function is called for vtables must | |
919 | remain the same, otherwise binary compatibility can be | |
920 | compromised. */ | |
921 | ||
922 | while (1) | |
923 | { | |
de35891e JM |
924 | char *buf1 = (char *) alloca (TYPE_ASSEMBLER_NAME_LENGTH (for_type) |
925 | + 1 + i); | |
2636fde4 JM |
926 | char *new_buf2; |
927 | ||
928 | sprintf (buf1, "%s%c%s", TYPE_ASSEMBLER_NAME_STRING (for_type), joiner, | |
929 | buf2); | |
486837a7 KG |
930 | buf = (char *) alloca (strlen (VTABLE_NAME_PREFIX) + strlen (buf1) + 1); |
931 | sprintf (buf, "%s%s", VTABLE_NAME_PREFIX, buf1); | |
2636fde4 JM |
932 | name = get_identifier (buf); |
933 | ||
934 | /* If this name doesn't clash, then we can use it, otherwise | |
935 | we add more to the name until it is unique. */ | |
936 | ||
937 | if (! IDENTIFIER_GLOBAL_VALUE (name)) | |
938 | break; | |
939 | ||
940 | /* Set values for next loop through, if the name isn't unique. */ | |
941 | ||
942 | path = BINFO_INHERITANCE_CHAIN (path); | |
943 | ||
944 | /* We better not run out of stuff to make it unique. */ | |
945 | my_friendly_assert (path != NULL_TREE, 368); | |
946 | ||
947 | basetype = TYPE_MAIN_VARIANT (BINFO_TYPE (path)); | |
948 | ||
de35891e JM |
949 | if (for_type == basetype) |
950 | { | |
951 | /* If we run out of basetypes in the path, we have already | |
952 | found created a vtable with that name before, we now | |
953 | resort to tacking on _%d to distinguish them. */ | |
954 | int j = 2; | |
955 | i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1 + i + 1 + 3; | |
956 | buf1 = (char *) alloca (i); | |
957 | do { | |
958 | sprintf (buf1, "%s%c%s%c%d", | |
959 | TYPE_ASSEMBLER_NAME_STRING (basetype), joiner, | |
960 | buf2, joiner, j); | |
486837a7 | 961 | buf = (char *) alloca (strlen (VTABLE_NAME_PREFIX) |
de35891e | 962 | + strlen (buf1) + 1); |
486837a7 | 963 | sprintf (buf, "%s%s", VTABLE_NAME_PREFIX, buf1); |
de35891e JM |
964 | name = get_identifier (buf); |
965 | ||
966 | /* If this name doesn't clash, then we can use it, | |
967 | otherwise we add something different to the name until | |
968 | it is unique. */ | |
969 | } while (++j <= 999 && IDENTIFIER_GLOBAL_VALUE (name)); | |
970 | ||
971 | /* Hey, they really like MI don't they? Increase the 3 | |
972 | above to 6, and the 999 to 999999. :-) */ | |
973 | my_friendly_assert (j <= 999, 369); | |
974 | ||
975 | break; | |
976 | } | |
2636fde4 JM |
977 | |
978 | i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1 + i; | |
979 | new_buf2 = (char *) alloca (i); | |
980 | sprintf (new_buf2, "%s%c%s", | |
981 | TYPE_ASSEMBLER_NAME_STRING (basetype), joiner, buf2); | |
982 | buf2 = new_buf2; | |
983 | } | |
8d08fdba | 984 | |
b9f39201 | 985 | new_decl = build_vtable (for_type, name, TREE_TYPE (orig_decl)); |
8d08fdba | 986 | DECL_ALIGN (new_decl) = DECL_ALIGN (orig_decl); |
11cf4d18 | 987 | DECL_USER_ALIGN (new_decl) = DECL_USER_ALIGN (orig_decl); |
b9f39201 | 988 | BINFO_VTABLE (binfo) = pushdecl_top_level (new_decl); |
8d08fdba | 989 | |
8d08fdba MS |
990 | #ifdef GATHER_STATISTICS |
991 | n_vtables += 1; | |
992 | n_vtable_elems += list_length (BINFO_VIRTUALS (binfo)); | |
993 | #endif | |
994 | ||
28531dd0 | 995 | return 1; |
8d08fdba MS |
996 | } |
997 | ||
28531dd0 MM |
998 | /* Create a new vtable for BINFO which is the hierarchy dominated by |
999 | T. */ | |
1000 | ||
1001 | static int | |
1002 | make_new_vtable (t, binfo) | |
1003 | tree t; | |
1004 | tree binfo; | |
1005 | { | |
1006 | if (binfo == TYPE_BINFO (t)) | |
1007 | /* In this case, it is *type*'s vtable we are modifying. We start | |
1008 | with the approximation that it's vtable is that of the | |
1009 | immediate base class. */ | |
1010 | return build_primary_vtable (TYPE_BINFO (DECL_CONTEXT (TYPE_VFIELD (t))), | |
1011 | t); | |
1012 | else | |
1013 | /* This is our very own copy of `basetype' to play with. Later, | |
1014 | we will fill in all the virtual functions that override the | |
1015 | virtual functions in these base classes which are not defined | |
1016 | by the current type. */ | |
1017 | return build_secondary_vtable (binfo, t); | |
1018 | } | |
1019 | ||
1020 | /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO | |
1021 | (which is in the hierarchy dominated by T) list FNDECL as its | |
4e7512c9 MM |
1022 | BV_FN. DELTA is the required constant adjustment from the `this' |
1023 | pointer where the vtable entry appears to the `this' required when | |
1024 | the function is actually called. */ | |
8d08fdba MS |
1025 | |
1026 | static void | |
5e19c053 | 1027 | modify_vtable_entry (t, binfo, fndecl, delta, virtuals) |
c0bbf652 MM |
1028 | tree t; |
1029 | tree binfo; | |
1030 | tree fndecl; | |
5e19c053 | 1031 | tree delta; |
28531dd0 | 1032 | tree *virtuals; |
8d08fdba | 1033 | { |
28531dd0 | 1034 | tree v; |
c0bbf652 | 1035 | |
28531dd0 | 1036 | v = *virtuals; |
c0bbf652 | 1037 | |
5e19c053 | 1038 | if (fndecl != BV_FN (v) |
4e7512c9 | 1039 | || !tree_int_cst_equal (delta, BV_DELTA (v))) |
c0bbf652 MM |
1040 | { |
1041 | tree base_fndecl; | |
1042 | ||
28531dd0 MM |
1043 | /* We need a new vtable for BINFO. */ |
1044 | if (make_new_vtable (t, binfo)) | |
1045 | { | |
1046 | /* If we really did make a new vtable, we also made a copy | |
1047 | of the BINFO_VIRTUALS list. Now, we have to find the | |
1048 | corresponding entry in that list. */ | |
1049 | *virtuals = BINFO_VIRTUALS (binfo); | |
5e19c053 | 1050 | while (BV_FN (*virtuals) != BV_FN (v)) |
28531dd0 MM |
1051 | *virtuals = TREE_CHAIN (*virtuals); |
1052 | v = *virtuals; | |
1053 | } | |
8d08fdba | 1054 | |
5e19c053 MM |
1055 | base_fndecl = BV_FN (v); |
1056 | BV_DELTA (v) = delta; | |
aabb4cd6 | 1057 | BV_VCALL_INDEX (v) = NULL_TREE; |
5e19c053 | 1058 | BV_FN (v) = fndecl; |
e92cc029 | 1059 | |
c0bbf652 MM |
1060 | /* Now assign virtual dispatch information, if unset. We can |
1061 | dispatch this, through any overridden base function. */ | |
1062 | if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST) | |
1063 | { | |
1064 | DECL_VINDEX (fndecl) = DECL_VINDEX (base_fndecl); | |
1065 | DECL_VIRTUAL_CONTEXT (fndecl) = DECL_VIRTUAL_CONTEXT (base_fndecl); | |
1066 | } | |
8d08fdba | 1067 | } |
8d08fdba MS |
1068 | } |
1069 | ||
da3d4dfa MM |
1070 | /* Return the index (in the virtual function table) of the first |
1071 | virtual function. */ | |
1072 | ||
1073 | int | |
1074 | first_vfun_index (t) | |
1075 | tree t; | |
1076 | { | |
1077 | /* Under the old ABI, the offset-to-top and RTTI entries are at | |
1078 | indices zero and one; under the new ABI, the first virtual | |
1079 | function is at index zero. */ | |
1080 | if (!CLASSTYPE_COM_INTERFACE (t) && !flag_new_abi) | |
1081 | return flag_vtable_thunks ? 2 : 1; | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | /* Set DECL_VINDEX for DECL. VINDEX_P is the number of virtual | |
1087 | functions present in the vtable so far. */ | |
bbd15aac MM |
1088 | |
1089 | static void | |
da3d4dfa | 1090 | set_vindex (t, decl, vfuns_p) |
bbd15aac | 1091 | tree t; |
da3d4dfa MM |
1092 | tree decl; |
1093 | int *vfuns_p; | |
bbd15aac | 1094 | { |
da3d4dfa MM |
1095 | int vindex; |
1096 | ||
1097 | vindex = (*vfuns_p)++; | |
1098 | vindex += first_vfun_index (t); | |
1099 | DECL_VINDEX (decl) = build_shared_int_cst (vindex); | |
bbd15aac MM |
1100 | } |
1101 | ||
7177d104 MS |
1102 | /* Add a virtual function to all the appropriate vtables for the class |
1103 | T. DECL_VINDEX(X) should be error_mark_node, if we want to | |
1104 | allocate a new slot in our table. If it is error_mark_node, we | |
1105 | know that no other function from another vtable is overridden by X. | |
da3d4dfa MM |
1106 | VFUNS_P keeps track of how many virtuals there are in our |
1107 | main vtable for the type, and we build upon the NEW_VIRTUALS list | |
7177d104 | 1108 | and return it. */ |
e92cc029 | 1109 | |
aa598818 | 1110 | static void |
051e6fd7 | 1111 | add_virtual_function (new_virtuals_p, overridden_virtuals_p, |
da3d4dfa | 1112 | vfuns_p, fndecl, t) |
051e6fd7 MM |
1113 | tree *new_virtuals_p; |
1114 | tree *overridden_virtuals_p; | |
da3d4dfa | 1115 | int *vfuns_p; |
7177d104 | 1116 | tree fndecl; |
e92cc029 | 1117 | tree t; /* Structure type. */ |
8d08fdba | 1118 | { |
c0bbf652 MM |
1119 | tree new_virtual; |
1120 | ||
051e6fd7 MM |
1121 | /* If this function doesn't override anything from a base class, we |
1122 | can just assign it a new DECL_VINDEX now. Otherwise, if it does | |
1123 | override something, we keep it around and assign its DECL_VINDEX | |
1124 | later, in modify_all_vtables. */ | |
1125 | if (TREE_CODE (DECL_VINDEX (fndecl)) == INTEGER_CST) | |
1126 | /* We've already dealt with this function. */ | |
c0bbf652 MM |
1127 | return; |
1128 | ||
31f8e4f3 MM |
1129 | new_virtual = make_node (TREE_LIST); |
1130 | BV_FN (new_virtual) = fndecl; | |
4e7512c9 | 1131 | BV_DELTA (new_virtual) = integer_zero_node; |
c0bbf652 MM |
1132 | |
1133 | if (DECL_VINDEX (fndecl) == error_mark_node) | |
8d08fdba | 1134 | { |
051e6fd7 MM |
1135 | /* FNDECL is a new virtual function; it doesn't override any |
1136 | virtual function in a base class. */ | |
1137 | ||
6b5fbb55 MS |
1138 | /* We remember that this was the base sub-object for rtti. */ |
1139 | CLASSTYPE_RTTI (t) = t; | |
8d08fdba | 1140 | |
a68ad5bd | 1141 | /* Now assign virtual dispatch information. */ |
da3d4dfa | 1142 | set_vindex (t, fndecl, vfuns_p); |
a68ad5bd | 1143 | DECL_VIRTUAL_CONTEXT (fndecl) = t; |
8d08fdba | 1144 | |
051e6fd7 | 1145 | /* Save the state we've computed on the NEW_VIRTUALS list. */ |
c0bbf652 MM |
1146 | TREE_CHAIN (new_virtual) = *new_virtuals_p; |
1147 | *new_virtuals_p = new_virtual; | |
1148 | } | |
1149 | else | |
1150 | { | |
1151 | /* FNDECL overrides a function from a base class. */ | |
1152 | TREE_CHAIN (new_virtual) = *overridden_virtuals_p; | |
1153 | *overridden_virtuals_p = new_virtual; | |
1154 | } | |
8d08fdba MS |
1155 | } |
1156 | \f | |
8d08fdba MS |
1157 | extern struct obstack *current_obstack; |
1158 | ||
452a394b MM |
1159 | /* Add method METHOD to class TYPE. If ERROR_P is true, we are adding |
1160 | the method after the class has already been defined because a | |
1161 | declaration for it was seen. (Even though that is erroneous, we | |
1162 | add the method for improved error recovery.) */ | |
e92cc029 | 1163 | |
8d08fdba | 1164 | void |
452a394b MM |
1165 | add_method (type, method, error_p) |
1166 | tree type; | |
1167 | tree method; | |
1168 | int error_p; | |
8d08fdba | 1169 | { |
aa52c1ff | 1170 | int using = (DECL_CONTEXT (method) != type); |
452a394b MM |
1171 | int len; |
1172 | int slot; | |
1173 | tree method_vec; | |
1174 | ||
1175 | if (!CLASSTYPE_METHOD_VEC (type)) | |
1176 | /* Make a new method vector. We start with 8 entries. We must | |
1177 | allocate at least two (for constructors and destructors), and | |
1178 | we're going to end up with an assignment operator at some point | |
1179 | as well. | |
1180 | ||
1181 | We could use a TREE_LIST for now, and convert it to a TREE_VEC | |
1182 | in finish_struct, but we would probably waste more memory | |
1183 | making the links in the list than we would by over-allocating | |
1184 | the size of the vector here. Furthermore, we would complicate | |
1185 | all the code that expects this to be a vector. */ | |
1186 | CLASSTYPE_METHOD_VEC (type) = make_tree_vec (8); | |
1187 | ||
1188 | method_vec = CLASSTYPE_METHOD_VEC (type); | |
1189 | len = TREE_VEC_LENGTH (method_vec); | |
1190 | ||
1191 | /* Constructors and destructors go in special slots. */ | |
1192 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method)) | |
1193 | slot = CLASSTYPE_CONSTRUCTOR_SLOT; | |
1194 | else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) | |
1195 | slot = CLASSTYPE_DESTRUCTOR_SLOT; | |
1196 | else | |
61a127b3 | 1197 | { |
452a394b MM |
1198 | /* See if we already have an entry with this name. */ |
1199 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; slot < len; ++slot) | |
1200 | if (!TREE_VEC_ELT (method_vec, slot) | |
1201 | || (DECL_NAME (OVL_CURRENT (TREE_VEC_ELT (method_vec, | |
1202 | slot))) | |
1203 | == DECL_NAME (method))) | |
1204 | break; | |
61a127b3 | 1205 | |
452a394b MM |
1206 | if (slot == len) |
1207 | { | |
1208 | /* We need a bigger method vector. */ | |
1209 | int new_len; | |
1210 | tree new_vec; | |
1211 | ||
1212 | /* In the non-error case, we are processing a class | |
1213 | definition. Double the size of the vector to give room | |
1214 | for new methods. */ | |
1215 | if (!error_p) | |
1216 | new_len = 2 * len; | |
1217 | /* In the error case, the vector is already complete. We | |
1218 | don't expect many errors, and the rest of the front-end | |
1219 | will get confused if there are empty slots in the vector. */ | |
1220 | else | |
1221 | new_len = len + 1; | |
1222 | ||
1223 | new_vec = make_tree_vec (new_len); | |
1224 | bcopy ((PTR) &TREE_VEC_ELT (method_vec, 0), | |
1225 | (PTR) &TREE_VEC_ELT (new_vec, 0), | |
1226 | len * sizeof (tree)); | |
1227 | len = new_len; | |
1228 | method_vec = CLASSTYPE_METHOD_VEC (type) = new_vec; | |
1229 | } | |
61a127b3 | 1230 | |
452a394b MM |
1231 | if (DECL_CONV_FN_P (method) && !TREE_VEC_ELT (method_vec, slot)) |
1232 | { | |
1233 | /* Type conversion operators have to come before ordinary | |
1234 | methods; add_conversions depends on this to speed up | |
1235 | looking for conversion operators. So, if necessary, we | |
1236 | slide some of the vector elements up. In theory, this | |
1237 | makes this algorithm O(N^2) but we don't expect many | |
1238 | conversion operators. */ | |
1239 | for (slot = 2; slot < len; ++slot) | |
8d08fdba | 1240 | { |
452a394b | 1241 | tree fn = TREE_VEC_ELT (method_vec, slot); |
03017874 | 1242 | |
452a394b MM |
1243 | if (!fn) |
1244 | /* There are no more entries in the vector, so we | |
1245 | can insert the new conversion operator here. */ | |
1246 | break; | |
03017874 | 1247 | |
452a394b MM |
1248 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) |
1249 | /* We can insert the new function right at the | |
1250 | SLOTth position. */ | |
1251 | break; | |
1252 | } | |
03017874 | 1253 | |
452a394b MM |
1254 | if (!TREE_VEC_ELT (method_vec, slot)) |
1255 | /* There is nothing in the Ith slot, so we can avoid | |
1256 | moving anything. */ | |
61a127b3 | 1257 | ; |
452a394b MM |
1258 | else |
1259 | { | |
1260 | /* We know the last slot in the vector is empty | |
1261 | because we know that at this point there's room | |
1262 | for a new function. */ | |
1263 | bcopy ((PTR) &TREE_VEC_ELT (method_vec, slot), | |
1264 | (PTR) &TREE_VEC_ELT (method_vec, slot + 1), | |
1265 | (len - slot - 1) * sizeof (tree)); | |
1266 | TREE_VEC_ELT (method_vec, slot) = NULL_TREE; | |
8d08fdba | 1267 | } |
61a127b3 | 1268 | } |
452a394b | 1269 | } |
61a127b3 | 1270 | |
452a394b MM |
1271 | if (template_class_depth (type)) |
1272 | /* TYPE is a template class. Don't issue any errors now; wait | |
1273 | until instantiation time to complain. */ | |
1274 | ; | |
1275 | else | |
1276 | { | |
1277 | tree fns; | |
03017874 | 1278 | |
452a394b MM |
1279 | /* Check to see if we've already got this method. */ |
1280 | for (fns = TREE_VEC_ELT (method_vec, slot); | |
1281 | fns; | |
1282 | fns = OVL_NEXT (fns)) | |
1283 | { | |
1284 | tree fn = OVL_CURRENT (fns); | |
03017874 | 1285 | |
452a394b MM |
1286 | if (TREE_CODE (fn) != TREE_CODE (method)) |
1287 | continue; | |
03017874 | 1288 | |
452a394b MM |
1289 | if (TREE_CODE (method) != TEMPLATE_DECL) |
1290 | { | |
1291 | /* [over.load] Member function declarations with the | |
1292 | same name and the same parameter types cannot be | |
1293 | overloaded if any of them is a static member | |
1294 | function declaration. */ | |
1295 | if ((DECL_STATIC_FUNCTION_P (fn) | |
1296 | != DECL_STATIC_FUNCTION_P (method)) | |
1297 | || using) | |
03017874 | 1298 | { |
452a394b MM |
1299 | tree parms1 = TYPE_ARG_TYPES (TREE_TYPE (fn)); |
1300 | tree parms2 = TYPE_ARG_TYPES (TREE_TYPE (method)); | |
1301 | ||
1302 | if (! DECL_STATIC_FUNCTION_P (fn)) | |
1303 | parms1 = TREE_CHAIN (parms1); | |
1304 | if (! DECL_STATIC_FUNCTION_P (method)) | |
1305 | parms2 = TREE_CHAIN (parms2); | |
1306 | ||
1307 | if (compparms (parms1, parms2)) | |
03017874 | 1308 | { |
452a394b MM |
1309 | if (using) |
1310 | /* Defer to the local function. */ | |
1311 | return; | |
1312 | else | |
1313 | cp_error ("`%#D' and `%#D' cannot be overloaded", | |
1314 | fn, method); | |
03017874 | 1315 | } |
03017874 | 1316 | } |
452a394b MM |
1317 | |
1318 | /* Since this is an ordinary function in a | |
1319 | non-template class, it's mangled name can be used | |
1320 | as a unique identifier. This technique is only | |
1321 | an optimization; we would get the same results if | |
1322 | we just used decls_match here. */ | |
1323 | if (DECL_ASSEMBLER_NAME (fn) | |
1324 | != DECL_ASSEMBLER_NAME (method)) | |
03017874 | 1325 | continue; |
452a394b MM |
1326 | } |
1327 | else if (!decls_match (fn, method)) | |
1328 | continue; | |
03017874 | 1329 | |
452a394b MM |
1330 | /* There has already been a declaration of this method |
1331 | or member template. */ | |
1332 | cp_error_at ("`%D' has already been declared in `%T'", | |
1333 | method, type); | |
03017874 | 1334 | |
452a394b MM |
1335 | /* We don't call duplicate_decls here to merge the |
1336 | declarations because that will confuse things if the | |
1337 | methods have inline definitions. In particular, we | |
1338 | will crash while processing the definitions. */ | |
1339 | return; | |
03017874 | 1340 | } |
452a394b | 1341 | } |
03017874 | 1342 | |
452a394b MM |
1343 | /* Actually insert the new method. */ |
1344 | TREE_VEC_ELT (method_vec, slot) | |
1345 | = build_overload (method, TREE_VEC_ELT (method_vec, slot)); | |
8f032717 MM |
1346 | |
1347 | /* Add the new binding. */ | |
452a394b MM |
1348 | if (!DECL_CONSTRUCTOR_P (method) |
1349 | && !DECL_DESTRUCTOR_P (method)) | |
1350 | push_class_level_binding (DECL_NAME (method), | |
1351 | TREE_VEC_ELT (method_vec, slot)); | |
8d08fdba MS |
1352 | } |
1353 | ||
1354 | /* Subroutines of finish_struct. */ | |
1355 | ||
1356 | /* Look through the list of fields for this struct, deleting | |
1357 | duplicates as we go. This must be recursive to handle | |
1358 | anonymous unions. | |
1359 | ||
1360 | FIELD is the field which may not appear anywhere in FIELDS. | |
1361 | FIELD_PTR, if non-null, is the starting point at which | |
1362 | chained deletions may take place. | |
1363 | The value returned is the first acceptable entry found | |
1364 | in FIELDS. | |
1365 | ||
1366 | Note that anonymous fields which are not of UNION_TYPE are | |
1367 | not duplicates, they are just anonymous fields. This happens | |
1368 | when we have unnamed bitfields, for example. */ | |
e92cc029 | 1369 | |
8d08fdba | 1370 | static tree |
00595019 MS |
1371 | delete_duplicate_fields_1 (field, fields) |
1372 | tree field, fields; | |
8d08fdba MS |
1373 | { |
1374 | tree x; | |
00595019 | 1375 | tree prev = 0; |
8d08fdba MS |
1376 | if (DECL_NAME (field) == 0) |
1377 | { | |
6bdb8141 | 1378 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
8d08fdba MS |
1379 | return fields; |
1380 | ||
1381 | for (x = TYPE_FIELDS (TREE_TYPE (field)); x; x = TREE_CHAIN (x)) | |
00595019 | 1382 | fields = delete_duplicate_fields_1 (x, fields); |
8d08fdba MS |
1383 | return fields; |
1384 | } | |
1385 | else | |
1386 | { | |
1387 | for (x = fields; x; prev = x, x = TREE_CHAIN (x)) | |
1388 | { | |
1389 | if (DECL_NAME (x) == 0) | |
1390 | { | |
6bdb8141 | 1391 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (x))) |
8d08fdba MS |
1392 | continue; |
1393 | TYPE_FIELDS (TREE_TYPE (x)) | |
00595019 | 1394 | = delete_duplicate_fields_1 (field, TYPE_FIELDS (TREE_TYPE (x))); |
8d08fdba MS |
1395 | if (TYPE_FIELDS (TREE_TYPE (x)) == 0) |
1396 | { | |
1397 | if (prev == 0) | |
1398 | fields = TREE_CHAIN (fields); | |
1399 | else | |
1400 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
1401 | } | |
1402 | } | |
58010b57 MM |
1403 | else if (TREE_CODE (field) == USING_DECL) |
1404 | /* A using declaration may is allowed to appear more than | |
1405 | once. We'll prune these from the field list later, and | |
1406 | handle_using_decl will complain about invalid multiple | |
1407 | uses. */ | |
1408 | ; | |
1409 | else if (DECL_NAME (field) == DECL_NAME (x)) | |
8d08fdba | 1410 | { |
58010b57 MM |
1411 | if (TREE_CODE (field) == CONST_DECL |
1412 | && TREE_CODE (x) == CONST_DECL) | |
1413 | cp_error_at ("duplicate enum value `%D'", x); | |
1414 | else if (TREE_CODE (field) == CONST_DECL | |
1415 | || TREE_CODE (x) == CONST_DECL) | |
1416 | cp_error_at ("duplicate field `%D' (as enum and non-enum)", | |
1417 | x); | |
1418 | else if (DECL_DECLARES_TYPE_P (field) | |
1419 | && DECL_DECLARES_TYPE_P (x)) | |
8d08fdba | 1420 | { |
58010b57 MM |
1421 | if (same_type_p (TREE_TYPE (field), TREE_TYPE (x))) |
1422 | continue; | |
1423 | cp_error_at ("duplicate nested type `%D'", x); | |
8d08fdba | 1424 | } |
58010b57 MM |
1425 | else if (DECL_DECLARES_TYPE_P (field) |
1426 | || DECL_DECLARES_TYPE_P (x)) | |
1427 | { | |
1428 | /* Hide tag decls. */ | |
1429 | if ((TREE_CODE (field) == TYPE_DECL | |
1430 | && DECL_ARTIFICIAL (field)) | |
1431 | || (TREE_CODE (x) == TYPE_DECL | |
1432 | && DECL_ARTIFICIAL (x))) | |
1433 | continue; | |
1434 | cp_error_at ("duplicate field `%D' (as type and non-type)", | |
1435 | x); | |
1436 | } | |
1437 | else | |
1438 | cp_error_at ("duplicate member `%D'", x); | |
1439 | if (prev == 0) | |
1440 | fields = TREE_CHAIN (fields); | |
1441 | else | |
1442 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
8d08fdba MS |
1443 | } |
1444 | } | |
1445 | } | |
1446 | return fields; | |
1447 | } | |
1448 | ||
1449 | static void | |
1450 | delete_duplicate_fields (fields) | |
1451 | tree fields; | |
1452 | { | |
1453 | tree x; | |
1454 | for (x = fields; x && TREE_CHAIN (x); x = TREE_CHAIN (x)) | |
00595019 | 1455 | TREE_CHAIN (x) = delete_duplicate_fields_1 (x, TREE_CHAIN (x)); |
8d08fdba MS |
1456 | } |
1457 | ||
aa52c1ff JM |
1458 | /* Change the access of FDECL to ACCESS in T. Return 1 if change was |
1459 | legit, otherwise return 0. */ | |
e92cc029 | 1460 | |
8d08fdba | 1461 | static int |
aa52c1ff | 1462 | alter_access (t, fdecl, access) |
8d08fdba MS |
1463 | tree t; |
1464 | tree fdecl; | |
be99da77 | 1465 | tree access; |
8d08fdba | 1466 | { |
721c3b42 MM |
1467 | tree elem; |
1468 | ||
1469 | if (!DECL_LANG_SPECIFIC (fdecl)) | |
1470 | retrofit_lang_decl (fdecl); | |
1471 | ||
1472 | elem = purpose_member (t, DECL_ACCESS (fdecl)); | |
38afd588 | 1473 | if (elem) |
8d08fdba | 1474 | { |
38afd588 | 1475 | if (TREE_VALUE (elem) != access) |
8d08fdba | 1476 | { |
38afd588 | 1477 | if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL) |
8251199e | 1478 | cp_error_at ("conflicting access specifications for method `%D', ignored", TREE_TYPE (fdecl)); |
38afd588 | 1479 | else |
8251199e | 1480 | error ("conflicting access specifications for field `%s', ignored", |
38afd588 | 1481 | IDENTIFIER_POINTER (DECL_NAME (fdecl))); |
8d08fdba MS |
1482 | } |
1483 | else | |
430bb96b JL |
1484 | { |
1485 | /* They're changing the access to the same thing they changed | |
1486 | it to before. That's OK. */ | |
1487 | ; | |
1488 | } | |
db5ae43f | 1489 | } |
38afd588 | 1490 | else |
8d08fdba | 1491 | { |
aa52c1ff | 1492 | enforce_access (t, fdecl); |
be99da77 | 1493 | DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl)); |
8d08fdba MS |
1494 | return 1; |
1495 | } | |
1496 | return 0; | |
1497 | } | |
1498 | ||
58010b57 | 1499 | /* Process the USING_DECL, which is a member of T. */ |
79ad62b2 | 1500 | |
e9659ab0 | 1501 | static void |
58010b57 | 1502 | handle_using_decl (using_decl, t) |
79ad62b2 MM |
1503 | tree using_decl; |
1504 | tree t; | |
79ad62b2 MM |
1505 | { |
1506 | tree ctype = DECL_INITIAL (using_decl); | |
1507 | tree name = DECL_NAME (using_decl); | |
1508 | tree access | |
1509 | = TREE_PRIVATE (using_decl) ? access_private_node | |
1510 | : TREE_PROTECTED (using_decl) ? access_protected_node | |
1511 | : access_public_node; | |
1512 | tree fdecl, binfo; | |
1513 | tree flist = NULL_TREE; | |
aa52c1ff | 1514 | tree old_value; |
79ad62b2 MM |
1515 | |
1516 | binfo = binfo_or_else (ctype, t); | |
1517 | if (! binfo) | |
1518 | return; | |
1519 | ||
1520 | if (name == constructor_name (ctype) | |
1521 | || name == constructor_name_full (ctype)) | |
2036a15c MM |
1522 | { |
1523 | cp_error_at ("using-declaration for constructor", using_decl); | |
1524 | return; | |
1525 | } | |
1526 | ||
79ad62b2 MM |
1527 | fdecl = lookup_member (binfo, name, 0, 0); |
1528 | ||
1529 | if (!fdecl) | |
1530 | { | |
8251199e | 1531 | cp_error_at ("no members matching `%D' in `%#T'", using_decl, ctype); |
79ad62b2 MM |
1532 | return; |
1533 | } | |
1534 | ||
aa52c1ff | 1535 | if (BASELINK_P (fdecl)) |
79ad62b2 MM |
1536 | /* Ignore base type this came from. */ |
1537 | fdecl = TREE_VALUE (fdecl); | |
1538 | ||
aa52c1ff JM |
1539 | old_value = IDENTIFIER_CLASS_VALUE (name); |
1540 | if (old_value) | |
79ad62b2 | 1541 | { |
aa52c1ff JM |
1542 | if (is_overloaded_fn (old_value)) |
1543 | old_value = OVL_CURRENT (old_value); | |
1544 | ||
1545 | if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t) | |
1546 | /* OK */; | |
1547 | else | |
1548 | old_value = NULL_TREE; | |
79ad62b2 | 1549 | } |
1c35f5b6 | 1550 | |
aa52c1ff JM |
1551 | if (is_overloaded_fn (fdecl)) |
1552 | flist = fdecl; | |
aa52c1ff JM |
1553 | |
1554 | if (! old_value) | |
1555 | ; | |
1556 | else if (is_overloaded_fn (old_value)) | |
79ad62b2 | 1557 | { |
aa52c1ff JM |
1558 | if (flist) |
1559 | /* It's OK to use functions from a base when there are functions with | |
1560 | the same name already present in the current class. */; | |
1561 | else | |
79ad62b2 | 1562 | { |
aa52c1ff JM |
1563 | cp_error ("`%D' invalid in `%#T'", using_decl, t); |
1564 | cp_error_at (" because of local method `%#D' with same name", | |
1565 | OVL_CURRENT (old_value)); | |
1566 | return; | |
79ad62b2 MM |
1567 | } |
1568 | } | |
1569 | else | |
aa52c1ff JM |
1570 | { |
1571 | cp_error ("`%D' invalid in `%#T'", using_decl, t); | |
1572 | cp_error_at (" because of local field `%#D' with same name", old_value); | |
1573 | return; | |
1574 | } | |
1575 | ||
1576 | /* Make type T see field decl FDECL with access ACCESS.*/ | |
1577 | if (flist) | |
1578 | for (; flist; flist = OVL_NEXT (flist)) | |
1579 | { | |
452a394b | 1580 | add_method (t, OVL_CURRENT (flist), /*error_p=*/0); |
aa52c1ff JM |
1581 | alter_access (t, OVL_CURRENT (flist), access); |
1582 | } | |
1583 | else | |
1584 | alter_access (t, fdecl, access); | |
79ad62b2 | 1585 | } |
8d08fdba | 1586 | \f |
607cf131 MM |
1587 | /* Run through the base clases of T, updating |
1588 | CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and | |
1589 | NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of | |
1590 | the bases. */ | |
8d08fdba | 1591 | |
607cf131 MM |
1592 | static void |
1593 | check_bases (t, cant_have_default_ctor_p, cant_have_const_ctor_p, | |
1594 | no_const_asn_ref_p) | |
8d08fdba | 1595 | tree t; |
607cf131 MM |
1596 | int *cant_have_default_ctor_p; |
1597 | int *cant_have_const_ctor_p; | |
1598 | int *no_const_asn_ref_p; | |
8d08fdba | 1599 | { |
607cf131 MM |
1600 | int n_baseclasses; |
1601 | int i; | |
f9c528ea | 1602 | int seen_nearly_empty_base_p; |
607cf131 | 1603 | tree binfos; |
8d08fdba | 1604 | |
607cf131 MM |
1605 | binfos = TYPE_BINFO_BASETYPES (t); |
1606 | n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
f9c528ea | 1607 | seen_nearly_empty_base_p = 0; |
607cf131 MM |
1608 | |
1609 | /* An aggregate cannot have baseclasses. */ | |
1610 | CLASSTYPE_NON_AGGREGATE (t) |= (n_baseclasses != 0); | |
1611 | ||
1612 | for (i = 0; i < n_baseclasses; ++i) | |
8d08fdba | 1613 | { |
607cf131 MM |
1614 | tree base_binfo; |
1615 | tree basetype; | |
8d08fdba | 1616 | |
607cf131 MM |
1617 | /* Figure out what base we're looking at. */ |
1618 | base_binfo = TREE_VEC_ELT (binfos, i); | |
1619 | basetype = TREE_TYPE (base_binfo); | |
9a71c18b | 1620 | |
607cf131 MM |
1621 | /* If the type of basetype is incomplete, then we already |
1622 | complained about that fact (and we should have fixed it up as | |
1623 | well). */ | |
d0f062fb | 1624 | if (!COMPLETE_TYPE_P (basetype)) |
8d08fdba MS |
1625 | { |
1626 | int j; | |
1627 | /* The base type is of incomplete type. It is | |
1628 | probably best to pretend that it does not | |
1629 | exist. */ | |
1630 | if (i == n_baseclasses-1) | |
1631 | TREE_VEC_ELT (binfos, i) = NULL_TREE; | |
1632 | TREE_VEC_LENGTH (binfos) -= 1; | |
1633 | n_baseclasses -= 1; | |
1634 | for (j = i; j+1 < n_baseclasses; j++) | |
1635 | TREE_VEC_ELT (binfos, j) = TREE_VEC_ELT (binfos, j+1); | |
607cf131 | 1636 | continue; |
8d08fdba MS |
1637 | } |
1638 | ||
4c6b7393 | 1639 | /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P |
607cf131 MM |
1640 | here because the case of virtual functions but non-virtual |
1641 | dtor is handled in finish_struct_1. */ | |
4c6b7393 | 1642 | if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype) |
607cf131 MM |
1643 | && TYPE_HAS_DESTRUCTOR (basetype)) |
1644 | cp_warning ("base class `%#T' has a non-virtual destructor", | |
1645 | basetype); | |
8d08fdba | 1646 | |
607cf131 MM |
1647 | /* If the base class doesn't have copy constructors or |
1648 | assignment operators that take const references, then the | |
1649 | derived class cannot have such a member automatically | |
1650 | generated. */ | |
1651 | if (! TYPE_HAS_CONST_INIT_REF (basetype)) | |
1652 | *cant_have_const_ctor_p = 1; | |
1653 | if (TYPE_HAS_ASSIGN_REF (basetype) | |
1654 | && !TYPE_HAS_CONST_ASSIGN_REF (basetype)) | |
1655 | *no_const_asn_ref_p = 1; | |
1656 | /* Similarly, if the base class doesn't have a default | |
1657 | constructor, then the derived class won't have an | |
1658 | automatically generated default constructor. */ | |
8d08fdba MS |
1659 | if (TYPE_HAS_CONSTRUCTOR (basetype) |
1660 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype)) | |
1661 | { | |
607cf131 | 1662 | *cant_have_default_ctor_p = 1; |
8d08fdba | 1663 | if (! TYPE_HAS_CONSTRUCTOR (t)) |
cb9a3ff8 GDR |
1664 | cp_pedwarn ("base `%T' with only non-default constructor in class without a constructor", |
1665 | basetype); | |
8d08fdba MS |
1666 | } |
1667 | ||
f9c528ea MM |
1668 | /* If the base class is not empty or nearly empty, then this |
1669 | class cannot be nearly empty. */ | |
1670 | if (!CLASSTYPE_NEARLY_EMPTY_P (basetype) && !is_empty_class (basetype)) | |
1671 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1672 | /* And if there is more than one nearly empty base, then the | |
1673 | derived class is not nearly empty either. */ | |
1674 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype) | |
1675 | && seen_nearly_empty_base_p) | |
1676 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1677 | /* If this is the first nearly empty base class, then remember | |
1678 | that we saw it. */ | |
1679 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)) | |
1680 | seen_nearly_empty_base_p = 1; | |
1681 | ||
607cf131 MM |
1682 | /* A lot of properties from the bases also apply to the derived |
1683 | class. */ | |
8d08fdba | 1684 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype); |
834c6dff MM |
1685 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
1686 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype); | |
607cf131 MM |
1687 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
1688 | |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype); | |
e8abc66f | 1689 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype); |
8d08fdba MS |
1690 | TYPE_OVERLOADS_CALL_EXPR (t) |= TYPE_OVERLOADS_CALL_EXPR (basetype); |
1691 | TYPE_OVERLOADS_ARRAY_REF (t) |= TYPE_OVERLOADS_ARRAY_REF (basetype); | |
1692 | TYPE_OVERLOADS_ARROW (t) |= TYPE_OVERLOADS_ARROW (basetype); | |
4c6b7393 | 1693 | TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype); |
8d08fdba | 1694 | |
607cf131 MM |
1695 | /* Derived classes can implicitly become COMified if their bases |
1696 | are COM. */ | |
aff08c18 | 1697 | if (CLASSTYPE_COM_INTERFACE (basetype)) |
607cf131 MM |
1698 | CLASSTYPE_COM_INTERFACE (t) = 1; |
1699 | else if (i == 0 && CLASSTYPE_COM_INTERFACE (t)) | |
aff08c18 | 1700 | { |
5574ac39 MK |
1701 | cp_error |
1702 | ("COM interface type `%T' with non-COM leftmost base class `%T'", | |
1703 | t, basetype); | |
aff08c18 JM |
1704 | CLASSTYPE_COM_INTERFACE (t) = 0; |
1705 | } | |
607cf131 MM |
1706 | } |
1707 | } | |
1708 | ||
c35cce41 MM |
1709 | /* Called via dfs_walk from mark_primary_bases. Sets |
1710 | BINFO_PRIMARY_MARKED_P for BINFO, if appropriate. */ | |
1711 | ||
1712 | static tree | |
1713 | dfs_mark_primary_bases (binfo, data) | |
1714 | tree binfo; | |
1715 | void *data; | |
1716 | { | |
c35cce41 MM |
1717 | tree base_binfo; |
1718 | ||
1719 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (binfo))) | |
1720 | return NULL_TREE; | |
1721 | ||
911a71a7 | 1722 | base_binfo = get_primary_binfo (binfo); |
c35cce41 | 1723 | |
911a71a7 | 1724 | if (TREE_VIA_VIRTUAL (base_binfo)) |
c35cce41 MM |
1725 | { |
1726 | tree shared_binfo; | |
23656158 | 1727 | tree type; |
c35cce41 | 1728 | |
23656158 MM |
1729 | type = (tree) data; |
1730 | shared_binfo = binfo_for_vbase (BINFO_TYPE (base_binfo), type); | |
c35cce41 MM |
1731 | |
1732 | /* If this virtual base is not already primary somewhere else in | |
1733 | the hiearchy, then we'll be using this copy. */ | |
911a71a7 | 1734 | if (!BINFO_PRIMARY_MARKED_P (shared_binfo)) |
c35cce41 | 1735 | { |
23656158 MM |
1736 | /* Make sure the CLASSTYPE_VBASECLASSES list contains the |
1737 | primary copy; it's the one that really exists. */ | |
1738 | if (base_binfo != shared_binfo) | |
1739 | TREE_VALUE (purpose_member (BINFO_TYPE (base_binfo), | |
1740 | CLASSTYPE_VBASECLASSES (type))) | |
1741 | = base_binfo; | |
c35cce41 | 1742 | } |
911a71a7 MM |
1743 | else |
1744 | base_binfo = NULL_TREE; | |
c35cce41 MM |
1745 | } |
1746 | ||
911a71a7 MM |
1747 | if (base_binfo) |
1748 | BINFO_PRIMARY_BASE_OF (base_binfo) = binfo; | |
1749 | ||
c35cce41 MM |
1750 | return NULL_TREE; |
1751 | } | |
1752 | ||
1753 | /* Set BINFO_PRIMARY_MARKED_P for all binfos in the hierarchy | |
1754 | dominated by BINFO that are primary bases. */ | |
1755 | ||
1756 | static void | |
1757 | mark_primary_bases (type) | |
1758 | tree type; | |
1759 | { | |
1760 | tree vbases; | |
1761 | ||
1762 | /* Mark the TYPE_BINFO hierarchy. We need to mark primary bases in | |
1763 | pre-order to deal with primary virtual bases. (The virtual base | |
1764 | would be skipped if it were not marked as primary, and that | |
1765 | requires getting to dfs_mark_primary_bases before | |
1766 | dfs_skip_nonprimary_vbases_unmarkedp has a chance to skip the | |
1767 | virtual base.) */ | |
1768 | dfs_walk_real (TYPE_BINFO (type), dfs_mark_primary_bases, NULL, | |
1769 | dfs_skip_nonprimary_vbases_unmarkedp, type); | |
1770 | ||
1771 | /* Now go through the virtual base classes in inheritance graph | |
1772 | order. Any that are not already primary will need to be | |
1773 | allocated in TYPE, and so we need to mark their primary bases. */ | |
1774 | for (vbases = TYPE_BINFO (type); vbases; vbases = TREE_CHAIN (vbases)) | |
1775 | { | |
1776 | tree vbase; | |
1777 | ||
1778 | /* Make sure that only BINFOs appear on this list. | |
1779 | Historically, the TREE_CHAIN was used for other purposes, and | |
1780 | we want to make sure that none of those uses remain. */ | |
1781 | my_friendly_assert (TREE_CODE (vbases) == TREE_VEC, 20000402); | |
1782 | ||
1783 | if (!TREE_VIA_VIRTUAL (vbases)) | |
1784 | continue; | |
1785 | ||
a55583e9 | 1786 | vbase = binfo_for_vbase (BINFO_TYPE (vbases), type); |
911a71a7 | 1787 | if (BINFO_PRIMARY_MARKED_P (vbase)) |
c35cce41 MM |
1788 | /* This virtual base was already included in the hierarchy, so |
1789 | there's nothing to do here. */ | |
1790 | continue; | |
1791 | ||
c35cce41 MM |
1792 | /* Now, walk its bases. */ |
1793 | dfs_walk_real (vbase, dfs_mark_primary_bases, NULL, | |
1794 | dfs_skip_nonprimary_vbases_unmarkedp, type); | |
c35cce41 MM |
1795 | } |
1796 | } | |
1797 | ||
911a71a7 | 1798 | /* Make the BINFO the primary base of T. */ |
607cf131 | 1799 | |
03702748 | 1800 | static void |
911a71a7 | 1801 | set_primary_base (t, binfo, vfuns_p) |
03702748 | 1802 | tree t; |
911a71a7 | 1803 | tree binfo; |
da3d4dfa | 1804 | int *vfuns_p; |
03702748 MM |
1805 | { |
1806 | tree basetype; | |
1807 | ||
911a71a7 MM |
1808 | CLASSTYPE_PRIMARY_BINFO (t) = binfo; |
1809 | basetype = BINFO_TYPE (binfo); | |
03702748 MM |
1810 | TYPE_BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (basetype); |
1811 | TYPE_BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (basetype); | |
1812 | TYPE_VFIELD (t) = TYPE_VFIELD (basetype); | |
1813 | CLASSTYPE_RTTI (t) = CLASSTYPE_RTTI (basetype); | |
da3d4dfa | 1814 | *vfuns_p = CLASSTYPE_VSIZE (basetype); |
03702748 | 1815 | } |
607cf131 | 1816 | |
03702748 | 1817 | /* Determine the primary class for T. */ |
607cf131 | 1818 | |
03702748 | 1819 | static void |
da3d4dfa | 1820 | determine_primary_base (t, vfuns_p) |
607cf131 | 1821 | tree t; |
da3d4dfa | 1822 | int *vfuns_p; |
607cf131 | 1823 | { |
607cf131 | 1824 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); |
911a71a7 MM |
1825 | tree vbases; |
1826 | tree type_binfo; | |
d2c5305b | 1827 | |
8026246f MM |
1828 | /* If there are no baseclasses, there is certainly no primary base. */ |
1829 | if (n_baseclasses == 0) | |
1830 | return; | |
1831 | ||
911a71a7 | 1832 | type_binfo = TYPE_BINFO (t); |
607cf131 MM |
1833 | |
1834 | for (i = 0; i < n_baseclasses; i++) | |
1835 | { | |
911a71a7 | 1836 | tree base_binfo = BINFO_BASETYPE (type_binfo, i); |
607cf131 | 1837 | tree basetype = BINFO_TYPE (base_binfo); |
aff08c18 | 1838 | |
bbd15aac | 1839 | if (TYPE_CONTAINS_VPTR_P (basetype)) |
8d08fdba | 1840 | { |
03702748 MM |
1841 | /* Even a virtual baseclass can contain our RTTI |
1842 | information. But, we prefer a non-virtual polymorphic | |
1843 | baseclass. */ | |
1844 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
1845 | CLASSTYPE_RTTI (t) = CLASSTYPE_RTTI (basetype); | |
6b5fbb55 | 1846 | |
8026246f MM |
1847 | /* A virtual baseclass can't be the primary base under the |
1848 | old ABI. And under the new ABI we still prefer a | |
1849 | non-virtual base. */ | |
8d08fdba MS |
1850 | if (TREE_VIA_VIRTUAL (base_binfo)) |
1851 | continue; | |
1852 | ||
03702748 | 1853 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
8d08fdba | 1854 | { |
911a71a7 | 1855 | set_primary_base (t, base_binfo, vfuns_p); |
03702748 | 1856 | CLASSTYPE_VFIELDS (t) = copy_list (CLASSTYPE_VFIELDS (basetype)); |
8d08fdba MS |
1857 | } |
1858 | else | |
1859 | { | |
03702748 MM |
1860 | tree vfields; |
1861 | ||
8d08fdba | 1862 | /* Only add unique vfields, and flatten them out as we go. */ |
03702748 MM |
1863 | for (vfields = CLASSTYPE_VFIELDS (basetype); |
1864 | vfields; | |
1865 | vfields = TREE_CHAIN (vfields)) | |
1866 | if (VF_BINFO_VALUE (vfields) == NULL_TREE | |
1867 | || ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields))) | |
1868 | CLASSTYPE_VFIELDS (t) | |
1869 | = tree_cons (base_binfo, | |
1870 | VF_BASETYPE_VALUE (vfields), | |
1871 | CLASSTYPE_VFIELDS (t)); | |
8d08fdba | 1872 | |
c35cce41 | 1873 | if (!flag_new_abi && *vfuns_p == 0) |
911a71a7 | 1874 | set_primary_base (t, base_binfo, vfuns_p); |
8d08fdba MS |
1875 | } |
1876 | } | |
1877 | } | |
1878 | ||
03702748 | 1879 | if (!TYPE_VFIELD (t)) |
911a71a7 MM |
1880 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
1881 | ||
1882 | /* Mark the indirect primary bases. */ | |
1883 | for (vbases = CLASSTYPE_VBASECLASSES (t); | |
1884 | vbases; | |
1885 | vbases = TREE_CHAIN (vbases)) | |
1886 | { | |
1887 | tree binfo = TREE_VALUE (vbases); | |
1888 | ||
1889 | /* See if this virtual base is an indirect primary base. If so, | |
1890 | it must be either a primary base or an indirect primary base | |
1891 | in one of the direct bases. */ | |
1892 | for (i = 0; i < n_baseclasses; ++i) | |
1893 | { | |
1894 | tree basetype; | |
1895 | tree v; | |
1896 | ||
1897 | basetype = TYPE_BINFO_BASETYPE (t, i); | |
1898 | for (v = CLASSTYPE_VBASECLASSES (basetype); | |
1899 | v; | |
1900 | v = TREE_CHAIN (v)) | |
1901 | { | |
1902 | tree b = TREE_VALUE (v); | |
1903 | if ((BINFO_PRIMARY_MARKED_P (b) | |
1904 | || BINFO_INDIRECT_PRIMARY_P (b)) | |
1905 | && same_type_p (BINFO_TYPE (b), BINFO_TYPE (binfo))) | |
1906 | { | |
1907 | BINFO_INDIRECT_PRIMARY_P (binfo) = 1; | |
1908 | break; | |
1909 | } | |
1910 | } | |
1911 | ||
1912 | /* If we've discovered that this virtual base is an indirect | |
1913 | primary base, then we can move on to the next virtual | |
1914 | base. */ | |
1915 | if (BINFO_INDIRECT_PRIMARY_P (binfo)) | |
1916 | break; | |
1917 | } | |
1918 | } | |
8026246f | 1919 | |
dd42e135 MM |
1920 | /* The new ABI allows for the use of a "nearly-empty" virtual base |
1921 | class as the primary base class if no non-virtual polymorphic | |
1922 | base can be found. */ | |
1923 | if (flag_new_abi && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
7cafdb8b | 1924 | { |
911a71a7 MM |
1925 | /* If not NULL, this is the best primary base candidate we have |
1926 | found so far. */ | |
1927 | tree candidate = NULL_TREE; | |
1928 | tree base_binfo; | |
7cafdb8b MM |
1929 | |
1930 | /* Loop over the baseclasses. */ | |
911a71a7 MM |
1931 | for (base_binfo = TYPE_BINFO (t); |
1932 | base_binfo; | |
1933 | base_binfo = TREE_CHAIN (base_binfo)) | |
7cafdb8b | 1934 | { |
7cafdb8b MM |
1935 | tree basetype = BINFO_TYPE (base_binfo); |
1936 | ||
1937 | if (TREE_VIA_VIRTUAL (base_binfo) | |
1938 | && CLASSTYPE_NEARLY_EMPTY_P (basetype)) | |
1939 | { | |
7cafdb8b MM |
1940 | /* If this is not an indirect primary base, then it's |
1941 | definitely our primary base. */ | |
911a71a7 | 1942 | if (!BINFO_INDIRECT_PRIMARY_P (base_binfo)) |
7cafdb8b | 1943 | { |
911a71a7 | 1944 | candidate = base_binfo; |
7cafdb8b MM |
1945 | break; |
1946 | } | |
1947 | /* If this was an indirect primary base, it's still our | |
1948 | primary base -- unless there's another nearly-empty | |
1949 | virtual base that isn't an indirect primary base. */ | |
911a71a7 MM |
1950 | else if (!candidate) |
1951 | candidate = base_binfo; | |
7cafdb8b MM |
1952 | } |
1953 | } | |
1954 | ||
1955 | /* If we've got a primary base, use it. */ | |
911a71a7 | 1956 | if (candidate) |
7cafdb8b MM |
1957 | { |
1958 | set_primary_base (t, candidate, vfuns_p); | |
1959 | CLASSTYPE_VFIELDS (t) | |
911a71a7 | 1960 | = copy_list (CLASSTYPE_VFIELDS (BINFO_TYPE (candidate))); |
7cafdb8b MM |
1961 | } |
1962 | } | |
dd42e135 MM |
1963 | |
1964 | /* Mark the primary base classes at this point. */ | |
8026246f | 1965 | mark_primary_bases (t); |
8d08fdba | 1966 | } |
8d08fdba | 1967 | \f |
d2c5305b MM |
1968 | /* Set memoizing fields and bits of T (and its variants) for later |
1969 | use. */ | |
e92cc029 | 1970 | |
8d08fdba | 1971 | static void |
d2c5305b | 1972 | finish_struct_bits (t) |
8d08fdba | 1973 | tree t; |
8d08fdba MS |
1974 | { |
1975 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
8d08fdba MS |
1976 | |
1977 | /* Fix up variants (if any). */ | |
1978 | tree variants = TYPE_NEXT_VARIANT (t); | |
1979 | while (variants) | |
1980 | { | |
1981 | /* These fields are in the _TYPE part of the node, not in | |
1982 | the TYPE_LANG_SPECIFIC component, so they are not shared. */ | |
1983 | TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t); | |
1984 | TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t); | |
1985 | TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t); | |
834c6dff MM |
1986 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants) |
1987 | = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); | |
8d08fdba | 1988 | |
4c6b7393 MM |
1989 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (variants) |
1990 | = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t); | |
1991 | TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t); | |
8d08fdba MS |
1992 | TYPE_USES_VIRTUAL_BASECLASSES (variants) = TYPE_USES_VIRTUAL_BASECLASSES (t); |
1993 | /* Copy whatever these are holding today. */ | |
1994 | TYPE_MIN_VALUE (variants) = TYPE_MIN_VALUE (t); | |
1995 | TYPE_MAX_VALUE (variants) = TYPE_MAX_VALUE (t); | |
5566b478 | 1996 | TYPE_FIELDS (variants) = TYPE_FIELDS (t); |
e92cc029 | 1997 | TYPE_SIZE (variants) = TYPE_SIZE (t); |
509087ae | 1998 | TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t); |
8d08fdba MS |
1999 | variants = TYPE_NEXT_VARIANT (variants); |
2000 | } | |
2001 | ||
d2c5305b | 2002 | if (n_baseclasses && TYPE_POLYMORPHIC_P (t)) |
fee7654e MM |
2003 | /* For a class w/o baseclasses, `finish_struct' has set |
2004 | CLASS_TYPE_ABSTRACT_VIRTUALS correctly (by | |
2005 | definition). Similarly for a class whose base classes do not | |
2006 | have vtables. When neither of these is true, we might have | |
2007 | removed abstract virtuals (by providing a definition), added | |
2008 | some (by declaring new ones), or redeclared ones from a base | |
2009 | class. We need to recalculate what's really an abstract virtual | |
2010 | at this point (by looking in the vtables). */ | |
2011 | get_pure_virtuals (t); | |
8d08fdba MS |
2012 | |
2013 | if (n_baseclasses) | |
2014 | { | |
2015 | /* Notice whether this class has type conversion functions defined. */ | |
2016 | tree binfo = TYPE_BINFO (t); | |
2017 | tree binfos = BINFO_BASETYPES (binfo); | |
2018 | tree basetype; | |
2019 | ||
2020 | for (i = n_baseclasses-1; i >= 0; i--) | |
2021 | { | |
2022 | basetype = BINFO_TYPE (TREE_VEC_ELT (binfos, i)); | |
2023 | ||
0b41abe6 | 2024 | TYPE_HAS_CONVERSION (t) |= TYPE_HAS_CONVERSION (basetype); |
8d08fdba MS |
2025 | } |
2026 | } | |
2027 | ||
e8abc66f MS |
2028 | /* If this type has a copy constructor, force its mode to be BLKmode, and |
2029 | force its TREE_ADDRESSABLE bit to be nonzero. This will cause it to | |
2030 | be passed by invisible reference and prevent it from being returned in | |
72b7eeff MS |
2031 | a register. |
2032 | ||
2033 | Also do this if the class has BLKmode but can still be returned in | |
2034 | registers, since function_cannot_inline_p won't let us inline | |
2035 | functions returning such a type. This affects the HP-PA. */ | |
2036 | if (! TYPE_HAS_TRIVIAL_INIT_REF (t) | |
2037 | || (TYPE_MODE (t) == BLKmode && ! aggregate_value_p (t) | |
2038 | && CLASSTYPE_NON_AGGREGATE (t))) | |
8d08fdba | 2039 | { |
e8abc66f | 2040 | tree variants; |
d2e5ee5c | 2041 | DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode; |
e8abc66f | 2042 | for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants)) |
8d08fdba MS |
2043 | { |
2044 | TYPE_MODE (variants) = BLKmode; | |
2045 | TREE_ADDRESSABLE (variants) = 1; | |
8d08fdba MS |
2046 | } |
2047 | } | |
2048 | } | |
2049 | ||
b0e0b31f MM |
2050 | /* Issue warnings about T having private constructors, but no friends, |
2051 | and so forth. | |
aed7b2a6 | 2052 | |
b0e0b31f MM |
2053 | HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or |
2054 | static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any | |
2055 | non-private static member functions. */ | |
2056 | ||
2057 | static void | |
2058 | maybe_warn_about_overly_private_class (t) | |
2059 | tree t; | |
aed7b2a6 | 2060 | { |
056a3b12 MM |
2061 | int has_member_fn = 0; |
2062 | int has_nonprivate_method = 0; | |
2063 | tree fn; | |
2064 | ||
2065 | if (!warn_ctor_dtor_privacy | |
b0e0b31f MM |
2066 | /* If the class has friends, those entities might create and |
2067 | access instances, so we should not warn. */ | |
056a3b12 MM |
2068 | || (CLASSTYPE_FRIEND_CLASSES (t) |
2069 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))) | |
b0e0b31f MM |
2070 | /* We will have warned when the template was declared; there's |
2071 | no need to warn on every instantiation. */ | |
056a3b12 MM |
2072 | || CLASSTYPE_TEMPLATE_INSTANTIATION (t)) |
2073 | /* There's no reason to even consider warning about this | |
2074 | class. */ | |
2075 | return; | |
2076 | ||
2077 | /* We only issue one warning, if more than one applies, because | |
2078 | otherwise, on code like: | |
2079 | ||
2080 | class A { | |
2081 | // Oops - forgot `public:' | |
2082 | A(); | |
2083 | A(const A&); | |
2084 | ~A(); | |
2085 | }; | |
2086 | ||
2087 | we warn several times about essentially the same problem. */ | |
2088 | ||
2089 | /* Check to see if all (non-constructor, non-destructor) member | |
2090 | functions are private. (Since there are no friends or | |
2091 | non-private statics, we can't ever call any of the private member | |
2092 | functions.) */ | |
2093 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
2094 | /* We're not interested in compiler-generated methods; they don't | |
2095 | provide any way to call private members. */ | |
2096 | if (!DECL_ARTIFICIAL (fn)) | |
2097 | { | |
2098 | if (!TREE_PRIVATE (fn)) | |
b0e0b31f | 2099 | { |
056a3b12 MM |
2100 | if (DECL_STATIC_FUNCTION_P (fn)) |
2101 | /* A non-private static member function is just like a | |
2102 | friend; it can create and invoke private member | |
2103 | functions, and be accessed without a class | |
2104 | instance. */ | |
2105 | return; | |
b0e0b31f | 2106 | |
056a3b12 MM |
2107 | has_nonprivate_method = 1; |
2108 | break; | |
2109 | } | |
ce0a5952 | 2110 | else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn)) |
056a3b12 MM |
2111 | has_member_fn = 1; |
2112 | } | |
aed7b2a6 | 2113 | |
056a3b12 MM |
2114 | if (!has_nonprivate_method && has_member_fn) |
2115 | { | |
ce0a5952 MM |
2116 | /* There are no non-private methods, and there's at least one |
2117 | private member function that isn't a constructor or | |
2118 | destructor. (If all the private members are | |
2119 | constructors/destructors we want to use the code below that | |
2120 | issues error messages specifically referring to | |
2121 | constructors/destructors.) */ | |
056a3b12 MM |
2122 | int i; |
2123 | tree binfos = BINFO_BASETYPES (TYPE_BINFO (t)); | |
2124 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); i++) | |
2125 | if (TREE_VIA_PUBLIC (TREE_VEC_ELT (binfos, i)) | |
2126 | || TREE_VIA_PROTECTED (TREE_VEC_ELT (binfos, i))) | |
2127 | { | |
2128 | has_nonprivate_method = 1; | |
2129 | break; | |
2130 | } | |
2131 | if (!has_nonprivate_method) | |
b0e0b31f | 2132 | { |
056a3b12 MM |
2133 | cp_warning ("all member functions in class `%T' are private", t); |
2134 | return; | |
b0e0b31f | 2135 | } |
056a3b12 | 2136 | } |
aed7b2a6 | 2137 | |
056a3b12 MM |
2138 | /* Even if some of the member functions are non-private, the class |
2139 | won't be useful for much if all the constructors or destructors | |
2140 | are private: such an object can never be created or destroyed. */ | |
2141 | if (TYPE_HAS_DESTRUCTOR (t)) | |
2142 | { | |
2143 | tree dtor = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1); | |
b0e0b31f | 2144 | |
056a3b12 MM |
2145 | if (TREE_PRIVATE (dtor)) |
2146 | { | |
2147 | cp_warning ("`%#T' only defines a private destructor and has no friends", | |
2148 | t); | |
2149 | return; | |
b0e0b31f | 2150 | } |
056a3b12 | 2151 | } |
b0e0b31f | 2152 | |
056a3b12 MM |
2153 | if (TYPE_HAS_CONSTRUCTOR (t)) |
2154 | { | |
2155 | int nonprivate_ctor = 0; | |
b0e0b31f | 2156 | |
056a3b12 MM |
2157 | /* If a non-template class does not define a copy |
2158 | constructor, one is defined for it, enabling it to avoid | |
2159 | this warning. For a template class, this does not | |
2160 | happen, and so we would normally get a warning on: | |
b0e0b31f | 2161 | |
056a3b12 | 2162 | template <class T> class C { private: C(); }; |
b0e0b31f | 2163 | |
056a3b12 MM |
2164 | To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All |
2165 | complete non-template or fully instantiated classes have this | |
2166 | flag set. */ | |
2167 | if (!TYPE_HAS_INIT_REF (t)) | |
2168 | nonprivate_ctor = 1; | |
2169 | else | |
2170 | for (fn = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 0); | |
2171 | fn; | |
2172 | fn = OVL_NEXT (fn)) | |
2173 | { | |
2174 | tree ctor = OVL_CURRENT (fn); | |
2175 | /* Ideally, we wouldn't count copy constructors (or, in | |
2176 | fact, any constructor that takes an argument of the | |
2177 | class type as a parameter) because such things cannot | |
2178 | be used to construct an instance of the class unless | |
2179 | you already have one. But, for now at least, we're | |
2180 | more generous. */ | |
2181 | if (! TREE_PRIVATE (ctor)) | |
b0e0b31f | 2182 | { |
056a3b12 MM |
2183 | nonprivate_ctor = 1; |
2184 | break; | |
b0e0b31f | 2185 | } |
056a3b12 | 2186 | } |
aed7b2a6 | 2187 | |
056a3b12 MM |
2188 | if (nonprivate_ctor == 0) |
2189 | { | |
2190 | cp_warning ("`%#T' only defines private constructors and has no friends", | |
2191 | t); | |
2192 | return; | |
b0e0b31f MM |
2193 | } |
2194 | } | |
aed7b2a6 MM |
2195 | } |
2196 | ||
f90cdf34 MT |
2197 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
2198 | ||
2199 | static int | |
2200 | field_decl_cmp (x, y) | |
2201 | const tree *x, *y; | |
2202 | { | |
2203 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
bff3ce71 JM |
2204 | /* A nontype is "greater" than a type. */ |
2205 | return DECL_DECLARES_TYPE_P (*y) - DECL_DECLARES_TYPE_P (*x); | |
f90cdf34 MT |
2206 | if (DECL_NAME (*x) == NULL_TREE) |
2207 | return -1; | |
2208 | if (DECL_NAME (*y) == NULL_TREE) | |
2209 | return 1; | |
2210 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
2211 | return -1; | |
2212 | return 1; | |
2213 | } | |
2214 | ||
2215 | /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */ | |
2216 | ||
2217 | static int | |
2218 | method_name_cmp (m1, m2) | |
2219 | const tree *m1, *m2; | |
2220 | { | |
2221 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) | |
2222 | return 0; | |
2223 | if (*m1 == NULL_TREE) | |
2224 | return -1; | |
2225 | if (*m2 == NULL_TREE) | |
2226 | return 1; | |
2227 | if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2))) | |
2228 | return -1; | |
2229 | return 1; | |
2230 | } | |
b0e0b31f | 2231 | |
8d08fdba MS |
2232 | /* Warn about duplicate methods in fn_fields. Also compact method |
2233 | lists so that lookup can be made faster. | |
2234 | ||
8d08fdba MS |
2235 | Data Structure: List of method lists. The outer list is a |
2236 | TREE_LIST, whose TREE_PURPOSE field is the field name and the | |
e1cd6e56 MS |
2237 | TREE_VALUE is the DECL_CHAIN of the FUNCTION_DECLs. TREE_CHAIN |
2238 | links the entire list of methods for TYPE_METHODS. Friends are | |
2239 | chained in the same way as member functions (? TREE_CHAIN or | |
2240 | DECL_CHAIN), but they live in the TREE_TYPE field of the outer | |
2241 | list. That allows them to be quickly deleted, and requires no | |
2242 | extra storage. | |
8d08fdba | 2243 | |
5b0cec3b MM |
2244 | Sort methods that are not special (i.e., constructors, destructors, |
2245 | and type conversion operators) so that we can find them faster in | |
2246 | search. */ | |
8d08fdba | 2247 | |
b0e0b31f MM |
2248 | static void |
2249 | finish_struct_methods (t) | |
8d08fdba | 2250 | tree t; |
8d08fdba | 2251 | { |
b0e0b31f | 2252 | tree fn_fields; |
58010b57 | 2253 | tree method_vec; |
58010b57 MM |
2254 | int slot, len; |
2255 | ||
2256 | if (!TYPE_METHODS (t)) | |
2257 | { | |
2258 | /* Clear these for safety; perhaps some parsing error could set | |
2259 | these incorrectly. */ | |
2260 | TYPE_HAS_CONSTRUCTOR (t) = 0; | |
2261 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
2262 | CLASSTYPE_METHOD_VEC (t) = NULL_TREE; | |
2263 | return; | |
2264 | } | |
2265 | ||
58010b57 | 2266 | method_vec = CLASSTYPE_METHOD_VEC (t); |
607cf131 | 2267 | my_friendly_assert (method_vec != NULL_TREE, 19991215); |
58010b57 | 2268 | len = TREE_VEC_LENGTH (method_vec); |
8d08fdba | 2269 | |
fc378698 MS |
2270 | /* First fill in entry 0 with the constructors, entry 1 with destructors, |
2271 | and the next few with type conversion operators (if any). */ | |
b0e0b31f MM |
2272 | for (fn_fields = TYPE_METHODS (t); fn_fields; |
2273 | fn_fields = TREE_CHAIN (fn_fields)) | |
5b0cec3b MM |
2274 | /* Clear out this flag. */ |
2275 | DECL_IN_AGGR_P (fn_fields) = 0; | |
8d08fdba | 2276 | |
0d9eb3ba | 2277 | if (TYPE_HAS_DESTRUCTOR (t) && !CLASSTYPE_DESTRUCTORS (t)) |
b0e0b31f MM |
2278 | /* We thought there was a destructor, but there wasn't. Some |
2279 | parse errors cause this anomalous situation. */ | |
2280 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
2281 | ||
2282 | /* Issue warnings about private constructors and such. If there are | |
2283 | no methods, then some public defaults are generated. */ | |
f90cdf34 MT |
2284 | maybe_warn_about_overly_private_class (t); |
2285 | ||
f90cdf34 MT |
2286 | /* Now sort the methods. */ |
2287 | while (len > 2 && TREE_VEC_ELT (method_vec, len-1) == NULL_TREE) | |
2288 | len--; | |
2289 | TREE_VEC_LENGTH (method_vec) = len; | |
2290 | ||
2291 | /* The type conversion ops have to live at the front of the vec, so we | |
2292 | can't sort them. */ | |
2293 | for (slot = 2; slot < len; ++slot) | |
2294 | { | |
2295 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
2296 | ||
2297 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
2298 | break; | |
2299 | } | |
2300 | if (len - slot > 1) | |
2301 | qsort (&TREE_VEC_ELT (method_vec, slot), len-slot, sizeof (tree), | |
2302 | (int (*)(const void *, const void *))method_name_cmp); | |
8d08fdba MS |
2303 | } |
2304 | ||
e92cc029 | 2305 | /* Emit error when a duplicate definition of a type is seen. Patch up. */ |
8d08fdba MS |
2306 | |
2307 | void | |
2308 | duplicate_tag_error (t) | |
2309 | tree t; | |
2310 | { | |
8251199e JM |
2311 | cp_error ("redefinition of `%#T'", t); |
2312 | cp_error_at ("previous definition here", t); | |
8d08fdba MS |
2313 | |
2314 | /* Pretend we haven't defined this type. */ | |
2315 | ||
2316 | /* All of the component_decl's were TREE_CHAINed together in the parser. | |
2317 | finish_struct_methods walks these chains and assembles all methods with | |
2318 | the same base name into DECL_CHAINs. Now we don't need the parser chains | |
e92cc029 MS |
2319 | anymore, so we unravel them. */ |
2320 | ||
2321 | /* This used to be in finish_struct, but it turns out that the | |
2322 | TREE_CHAIN is used by dbxout_type_methods and perhaps some other | |
2323 | things... */ | |
fc378698 | 2324 | if (CLASSTYPE_METHOD_VEC (t)) |
8d08fdba | 2325 | { |
fc378698 MS |
2326 | tree method_vec = CLASSTYPE_METHOD_VEC (t); |
2327 | int i, len = TREE_VEC_LENGTH (method_vec); | |
8d08fdba MS |
2328 | for (i = 0; i < len; i++) |
2329 | { | |
fc378698 | 2330 | tree unchain = TREE_VEC_ELT (method_vec, i); |
8d08fdba MS |
2331 | while (unchain != NULL_TREE) |
2332 | { | |
2c73f9f5 ML |
2333 | TREE_CHAIN (OVL_CURRENT (unchain)) = NULL_TREE; |
2334 | unchain = OVL_NEXT (unchain); | |
8d08fdba MS |
2335 | } |
2336 | } | |
2337 | } | |
2338 | ||
2339 | if (TYPE_LANG_SPECIFIC (t)) | |
2340 | { | |
8d08fdba | 2341 | tree binfo = TYPE_BINFO (t); |
8d08fdba MS |
2342 | int interface_only = CLASSTYPE_INTERFACE_ONLY (t); |
2343 | int interface_unknown = CLASSTYPE_INTERFACE_UNKNOWN (t); | |
13bd123d NS |
2344 | tree template_info = CLASSTYPE_TEMPLATE_INFO (t); |
2345 | int use_template = CLASSTYPE_USE_TEMPLATE (t); | |
8d08fdba | 2346 | |
1daa5dd8 | 2347 | bzero ((char *) TYPE_LANG_SPECIFIC (t), sizeof (struct lang_type)); |
8d08fdba MS |
2348 | BINFO_BASETYPES(binfo) = NULL_TREE; |
2349 | ||
8d08fdba | 2350 | TYPE_BINFO (t) = binfo; |
8d08fdba MS |
2351 | CLASSTYPE_INTERFACE_ONLY (t) = interface_only; |
2352 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t, interface_unknown); | |
8d08fdba | 2353 | TYPE_REDEFINED (t) = 1; |
13bd123d NS |
2354 | CLASSTYPE_TEMPLATE_INFO (t) = template_info; |
2355 | CLASSTYPE_USE_TEMPLATE (t) = use_template; | |
8d08fdba MS |
2356 | } |
2357 | TYPE_SIZE (t) = NULL_TREE; | |
2358 | TYPE_MODE (t) = VOIDmode; | |
2359 | TYPE_FIELDS (t) = NULL_TREE; | |
2360 | TYPE_METHODS (t) = NULL_TREE; | |
2361 | TYPE_VFIELD (t) = NULL_TREE; | |
2362 | TYPE_CONTEXT (t) = NULL_TREE; | |
6f1b4c42 | 2363 | TYPE_NONCOPIED_PARTS (t) = NULL_TREE; |
8d08fdba MS |
2364 | } |
2365 | ||
8d7a5379 MM |
2366 | /* Make the BINFO's vtablehave N entries, including RTTI entries, |
2367 | vbase and vcall offsets, etc. Set its type and call the backend | |
2368 | to lay it out. */ | |
1a588ad7 MM |
2369 | |
2370 | static void | |
2371 | layout_vtable_decl (binfo, n) | |
2372 | tree binfo; | |
2373 | int n; | |
2374 | { | |
2375 | tree itype; | |
2376 | tree atype; | |
c35cce41 | 2377 | tree vtable; |
1a588ad7 MM |
2378 | |
2379 | itype = size_int (n); | |
1a588ad7 MM |
2380 | atype = build_cplus_array_type (vtable_entry_type, |
2381 | build_index_type (itype)); | |
2382 | layout_type (atype); | |
2383 | ||
2384 | /* We may have to grow the vtable. */ | |
c35cce41 MM |
2385 | vtable = get_vtbl_decl_for_binfo (binfo); |
2386 | if (!same_type_p (TREE_TYPE (vtable), atype)) | |
1a588ad7 | 2387 | { |
06ceef4e | 2388 | TREE_TYPE (vtable) = atype; |
c35cce41 | 2389 | DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE; |
06ceef4e RK |
2390 | layout_decl (vtable, 0); |
2391 | ||
1a588ad7 | 2392 | /* At one time the vtable info was grabbed 2 words at a time. This |
06ceef4e RK |
2393 | fails on Sparc unless you have 8-byte alignment. */ |
2394 | DECL_ALIGN (vtable) = MAX (TYPE_ALIGN (double_type_node), | |
2395 | DECL_ALIGN (vtable)); | |
1a588ad7 MM |
2396 | } |
2397 | } | |
2398 | ||
9bab6c90 MM |
2399 | /* True iff FNDECL and BASE_FNDECL (both non-static member functions) |
2400 | have the same signature. */ | |
83f2ccf4 | 2401 | |
ca36f057 | 2402 | static int |
9bab6c90 | 2403 | same_signature_p (fndecl, base_fndecl) |
ca36f057 | 2404 | tree fndecl, base_fndecl; |
83f2ccf4 | 2405 | { |
872f37f9 MM |
2406 | /* One destructor overrides another if they are the same kind of |
2407 | destructor. */ | |
2408 | if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl) | |
2409 | && special_function_p (base_fndecl) == special_function_p (fndecl)) | |
ca36f057 | 2410 | return 1; |
872f37f9 MM |
2411 | /* But a non-destructor never overrides a destructor, nor vice |
2412 | versa, nor do different kinds of destructors override | |
2413 | one-another. For example, a complete object destructor does not | |
2414 | override a deleting destructor. */ | |
0d9eb3ba | 2415 | if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl)) |
ca36f057 | 2416 | return 0; |
872f37f9 | 2417 | |
ca36f057 | 2418 | if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)) |
83f2ccf4 | 2419 | { |
ca36f057 | 2420 | tree types, base_types; |
ca36f057 MM |
2421 | types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); |
2422 | base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl)); | |
2423 | if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types))) | |
2424 | == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types)))) | |
2425 | && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types))) | |
2426 | return 1; | |
83f2ccf4 | 2427 | } |
ca36f057 | 2428 | return 0; |
83f2ccf4 MM |
2429 | } |
2430 | ||
ca36f057 MM |
2431 | typedef struct find_final_overrider_data_s { |
2432 | /* The function for which we are trying to find a final overrider. */ | |
2433 | tree fn; | |
2434 | /* The base class in which the function was declared. */ | |
2435 | tree declaring_base; | |
2436 | /* The most derived class in the hierarchy. */ | |
2437 | tree most_derived_type; | |
2438 | /* The final overriding function. */ | |
2439 | tree overriding_fn; | |
2440 | /* The BINFO for the class in which the final overriding function | |
2441 | appears. */ | |
2442 | tree overriding_base; | |
2443 | } find_final_overrider_data; | |
8d7a5379 | 2444 | |
ca36f057 | 2445 | /* Called from find_final_overrider via dfs_walk. */ |
8d7a5379 MM |
2446 | |
2447 | static tree | |
ca36f057 | 2448 | dfs_find_final_overrider (binfo, data) |
8d7a5379 MM |
2449 | tree binfo; |
2450 | void *data; | |
7177d104 | 2451 | { |
ca36f057 | 2452 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; |
3c9d6359 | 2453 | |
ca36f057 MM |
2454 | if (same_type_p (BINFO_TYPE (binfo), |
2455 | BINFO_TYPE (ffod->declaring_base)) | |
2456 | && tree_int_cst_equal (BINFO_OFFSET (binfo), | |
2457 | BINFO_OFFSET (ffod->declaring_base))) | |
7177d104 | 2458 | { |
ca36f057 MM |
2459 | tree path; |
2460 | tree method; | |
2461 | ||
db3d8cde MM |
2462 | /* We haven't found an overrider yet. */ |
2463 | method = NULL_TREE; | |
ca36f057 MM |
2464 | /* We've found a path to the declaring base. Walk down the path |
2465 | looking for an overrider for FN. */ | |
db3d8cde | 2466 | for (path = reverse_path (binfo); |
ca36f057 MM |
2467 | path; |
2468 | path = TREE_CHAIN (path)) | |
8d7a5379 | 2469 | { |
ca36f057 MM |
2470 | for (method = TYPE_METHODS (BINFO_TYPE (TREE_VALUE (path))); |
2471 | method; | |
2472 | method = TREE_CHAIN (method)) | |
9bab6c90 MM |
2473 | if (DECL_VIRTUAL_P (method) |
2474 | && same_signature_p (method, ffod->fn)) | |
ca36f057 | 2475 | break; |
a292b002 | 2476 | |
5e19c053 MM |
2477 | if (method) |
2478 | break; | |
2479 | } | |
2480 | ||
2481 | /* If we found an overrider, record the overriding function, and | |
2482 | the base from which it came. */ | |
2483 | if (path) | |
a292b002 | 2484 | { |
db3d8cde MM |
2485 | tree base; |
2486 | ||
911a71a7 MM |
2487 | /* Assume the path is non-virtual. See if there are any |
2488 | virtual bases from (but not including) the overrider up | |
2489 | to and including the base where the function is | |
2490 | defined. */ | |
db3d8cde MM |
2491 | for (base = TREE_CHAIN (path); base; base = TREE_CHAIN (base)) |
2492 | if (TREE_VIA_VIRTUAL (TREE_VALUE (base))) | |
2493 | { | |
2494 | base = ffod->declaring_base; | |
2495 | while (BINFO_PRIMARY_MARKED_P (base)) | |
2496 | { | |
2497 | BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (base) = 1; | |
2498 | base = BINFO_INHERITANCE_CHAIN (base); | |
2499 | } | |
2500 | BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (base) = 1; | |
2501 | break; | |
2502 | } | |
2503 | ||
5e19c053 | 2504 | if (ffod->overriding_fn && ffod->overriding_fn != method) |
a292b002 | 2505 | { |
5e19c053 MM |
2506 | /* We've found a different overrider along a different |
2507 | path. That can be OK if the new one overrides the | |
2508 | old one. Consider: | |
2509 | ||
2510 | struct S { virtual void f(); }; | |
2511 | struct T : public virtual S { virtual void f(); }; | |
2512 | struct U : public virtual S, public virtual T {}; | |
2513 | ||
2514 | Here `T::f' is the final overrider for `S::f'. */ | |
2515 | if (strictly_overrides (method, ffod->overriding_fn)) | |
2516 | { | |
2517 | ffod->overriding_fn = method; | |
2518 | ffod->overriding_base = TREE_VALUE (path); | |
2519 | } | |
2520 | else if (!strictly_overrides (ffod->overriding_fn, method)) | |
2521 | { | |
2522 | cp_error ("no unique final overrider for `%D' in `%T'", | |
2523 | ffod->most_derived_type, | |
2524 | ffod->fn); | |
2525 | cp_error ("candidates are: `%#D'", ffod->overriding_fn); | |
2526 | cp_error (" `%#D'", method); | |
2527 | return error_mark_node; | |
2528 | } | |
2529 | } | |
2530 | else if (ffod->overriding_base | |
2531 | && (!tree_int_cst_equal | |
2532 | (BINFO_OFFSET (TREE_VALUE (path)), | |
2533 | BINFO_OFFSET (ffod->overriding_base)))) | |
2534 | { | |
2535 | /* We've found two instances of the same base that | |
2536 | provide overriders. */ | |
2537 | cp_error ("no unique final overrider for `%D' since there two instances of `%T' in `%T'", | |
2538 | ffod->fn, | |
2539 | BINFO_TYPE (ffod->overriding_base), | |
2540 | ffod->most_derived_type); | |
2541 | return error_mark_node; | |
2542 | } | |
2543 | else | |
2544 | { | |
2545 | ffod->overriding_fn = method; | |
2546 | ffod->overriding_base = TREE_VALUE (path); | |
a292b002 | 2547 | } |
a292b002 MS |
2548 | } |
2549 | } | |
dd42e135 MM |
2550 | |
2551 | return NULL_TREE; | |
2552 | } | |
2553 | ||
5e19c053 MM |
2554 | /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for |
2555 | FN and whose TREE_VALUE is the binfo for the base where the | |
2556 | overriding occurs. BINFO (in the hierarchy dominated by T) is the | |
2557 | base object in which FN is declared. */ | |
e92cc029 | 2558 | |
a292b002 | 2559 | static tree |
5e19c053 MM |
2560 | find_final_overrider (t, binfo, fn) |
2561 | tree t; | |
2562 | tree binfo; | |
2563 | tree fn; | |
a292b002 | 2564 | { |
5e19c053 | 2565 | find_final_overrider_data ffod; |
a292b002 | 2566 | |
5e19c053 | 2567 | /* Getting this right is a little tricky. This is legal: |
a292b002 | 2568 | |
5e19c053 MM |
2569 | struct S { virtual void f (); }; |
2570 | struct T { virtual void f (); }; | |
2571 | struct U : public S, public T { }; | |
a292b002 | 2572 | |
5e19c053 | 2573 | even though calling `f' in `U' is ambiguous. But, |
a292b002 | 2574 | |
5e19c053 MM |
2575 | struct R { virtual void f(); }; |
2576 | struct S : virtual public R { virtual void f (); }; | |
2577 | struct T : virtual public R { virtual void f (); }; | |
2578 | struct U : public S, public T { }; | |
dd42e135 | 2579 | |
5e19c053 MM |
2580 | is not -- there's no way to decide whether to put `S::f' or |
2581 | `T::f' in the vtable for `R'. | |
2582 | ||
2583 | The solution is to look at all paths to BINFO. If we find | |
2584 | different overriders along any two, then there is a problem. */ | |
2585 | ffod.fn = fn; | |
2586 | ffod.declaring_base = binfo; | |
2587 | ffod.most_derived_type = t; | |
2588 | ffod.overriding_fn = NULL_TREE; | |
2589 | ffod.overriding_base = NULL_TREE; | |
2590 | ||
2591 | if (dfs_walk (TYPE_BINFO (t), | |
2592 | dfs_find_final_overrider, | |
2593 | NULL, | |
2594 | &ffod)) | |
2595 | return error_mark_node; | |
dd42e135 | 2596 | |
5e19c053 | 2597 | return build_tree_list (ffod.overriding_fn, ffod.overriding_base); |
a292b002 MS |
2598 | } |
2599 | ||
4e7512c9 MM |
2600 | /* Update a entry in the vtable for BINFO, which is in the hierarchy |
2601 | dominated by T. FN has been overridden in BINFO; VIRTUALS points | |
2602 | to the corresponding position in the BINFO_VIRTUALS list. */ | |
2603 | ||
2604 | static void | |
2605 | update_vtable_entry_for_fn (t, binfo, fn, virtuals) | |
2606 | tree t; | |
2607 | tree binfo; | |
2608 | tree fn; | |
2609 | tree *virtuals; | |
2610 | { | |
2611 | tree b; | |
2612 | tree overrider; | |
4e7512c9 | 2613 | tree delta; |
31f8e4f3 MM |
2614 | tree virtual_base; |
2615 | int generate_thunk_with_vtable_p; | |
4e7512c9 MM |
2616 | |
2617 | /* Find the function which originally caused this vtable | |
2618 | entry to be present. */ | |
31f8e4f3 MM |
2619 | b = binfo; |
2620 | while (1) | |
4e7512c9 | 2621 | { |
31f8e4f3 MM |
2622 | tree primary_base; |
2623 | tree f; | |
2624 | ||
911a71a7 | 2625 | primary_base = get_primary_binfo (b); |
31f8e4f3 MM |
2626 | if (!primary_base) |
2627 | break; | |
2628 | ||
2629 | for (f = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (primary_base))); | |
2630 | f; | |
2631 | f = TREE_CHAIN (f)) | |
2632 | if (same_signature_p (BV_FN (f), fn)) | |
2633 | break; | |
2634 | ||
2635 | if (!f) | |
2636 | break; | |
2637 | ||
2638 | fn = BV_FN (f); | |
2639 | b = primary_base; | |
4e7512c9 | 2640 | } |
4e7512c9 | 2641 | |
31f8e4f3 | 2642 | /* Find the final overrider. */ |
4e7512c9 MM |
2643 | overrider = find_final_overrider (t, b, fn); |
2644 | if (overrider == error_mark_node) | |
2645 | return; | |
2646 | ||
2647 | /* Compute the constant adjustment to the `this' pointer. The | |
2648 | `this' pointer, when this function is called, will point at the | |
2649 | class whose vtable this is. */ | |
2650 | delta = size_binop (PLUS_EXPR, | |
2651 | get_derived_offset (binfo, | |
2652 | DECL_VIRTUAL_CONTEXT (fn)), | |
2653 | BINFO_OFFSET (binfo)); | |
31f8e4f3 MM |
2654 | |
2655 | /* Assume that we will produce a thunk that convert all the way to | |
2656 | the final overrider, and not to an intermediate virtual base. */ | |
9ccf6541 | 2657 | virtual_base = NULL_TREE; |
31f8e4f3 MM |
2658 | |
2659 | /* Assume that we will always generate thunks with the vtables that | |
2660 | reference them. */ | |
2661 | generate_thunk_with_vtable_p = 1; | |
2662 | ||
2663 | /* Under the new ABI, we will convert to an intermediate virtual | |
2664 | base first, and then use the vcall offset located there to finish | |
2665 | the conversion. */ | |
4e7512c9 MM |
2666 | if (flag_new_abi) |
2667 | { | |
31f8e4f3 | 2668 | while (b) |
4e7512c9 | 2669 | { |
31f8e4f3 MM |
2670 | /* If we find BINFO, then the final overrider is in a class |
2671 | derived from BINFO, so the thunks can be generated with | |
2672 | the final overrider. */ | |
9ccf6541 MM |
2673 | if (!virtual_base |
2674 | && same_type_p (BINFO_TYPE (b), BINFO_TYPE (binfo))) | |
31f8e4f3 MM |
2675 | generate_thunk_with_vtable_p = 0; |
2676 | ||
2677 | /* If we find the final overrider, then we can stop | |
2678 | walking. */ | |
4e7512c9 MM |
2679 | if (same_type_p (BINFO_TYPE (b), |
2680 | BINFO_TYPE (TREE_VALUE (overrider)))) | |
2681 | break; | |
31f8e4f3 MM |
2682 | |
2683 | /* If we find a virtual base, and we haven't yet found the | |
2684 | overrider, then there is a virtual base between the | |
2685 | declaring base and the final overrider. */ | |
2686 | if (!virtual_base && TREE_VIA_VIRTUAL (b)) | |
2687 | { | |
2688 | generate_thunk_with_vtable_p = 1; | |
2689 | virtual_base = b; | |
2690 | } | |
2691 | ||
2692 | b = BINFO_INHERITANCE_CHAIN (b); | |
4e7512c9 MM |
2693 | } |
2694 | } | |
2695 | else | |
31f8e4f3 | 2696 | virtual_base = NULL_TREE; |
4e7512c9 | 2697 | |
31f8e4f3 | 2698 | if (virtual_base) |
4e7512c9 MM |
2699 | /* The `this' pointer needs to be adjusted to the nearest virtual |
2700 | base. */ | |
31f8e4f3 | 2701 | delta = size_diffop (BINFO_OFFSET (virtual_base), delta); |
4e7512c9 MM |
2702 | else |
2703 | /* The `this' pointer needs to be adjusted from pointing to | |
2704 | BINFO to pointing at the base where the final overrider | |
2705 | appears. */ | |
2706 | delta = size_diffop (BINFO_OFFSET (TREE_VALUE (overrider)), delta); | |
2707 | ||
2708 | modify_vtable_entry (t, | |
2709 | binfo, | |
2710 | TREE_PURPOSE (overrider), | |
2711 | delta, | |
2712 | virtuals); | |
31f8e4f3 MM |
2713 | |
2714 | if (virtual_base) | |
2715 | BV_USE_VCALL_INDEX_P (*virtuals) = 1; | |
2716 | if (generate_thunk_with_vtable_p) | |
2717 | BV_GENERATE_THUNK_WITH_VTABLE_P (*virtuals) = 1; | |
4e7512c9 MM |
2718 | } |
2719 | ||
8026246f | 2720 | /* Called from modify_all_vtables via dfs_walk. */ |
e92cc029 | 2721 | |
8026246f MM |
2722 | static tree |
2723 | dfs_modify_vtables (binfo, data) | |
2724 | tree binfo; | |
2725 | void *data; | |
2726 | { | |
2727 | if (/* There's no need to modify the vtable for a primary base; | |
2728 | we're not going to use that vtable anyhow. */ | |
2729 | !BINFO_PRIMARY_MARKED_P (binfo) | |
2730 | /* Similarly, a base without a vtable needs no modification. */ | |
2731 | && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))) | |
7177d104 | 2732 | { |
5e19c053 MM |
2733 | tree t; |
2734 | tree virtuals; | |
2735 | tree old_virtuals; | |
2736 | ||
2737 | t = (tree) data; | |
2738 | ||
64cfdfb8 MM |
2739 | /* If we're supporting RTTI then we always need a new vtable to |
2740 | point to the RTTI information. Under the new ABI we may need | |
2741 | a new vtable to contain vcall and vbase offsets. */ | |
5e19c053 MM |
2742 | if (flag_rtti || flag_new_abi) |
2743 | make_new_vtable (t, binfo); | |
2744 | ||
2745 | /* Now, go through each of the virtual functions in the virtual | |
2746 | function table for BINFO. Find the final overrider, and | |
2747 | update the BINFO_VIRTUALS list appropriately. */ | |
da3d4dfa MM |
2748 | for (virtuals = BINFO_VIRTUALS (binfo), |
2749 | old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
5e19c053 MM |
2750 | virtuals; |
2751 | virtuals = TREE_CHAIN (virtuals), | |
2752 | old_virtuals = TREE_CHAIN (old_virtuals)) | |
4e7512c9 MM |
2753 | update_vtable_entry_for_fn (t, |
2754 | binfo, | |
2755 | BV_FN (old_virtuals), | |
2756 | &virtuals); | |
7177d104 | 2757 | } |
8026246f MM |
2758 | |
2759 | SET_BINFO_MARKED (binfo); | |
2760 | ||
2761 | return NULL_TREE; | |
2762 | } | |
2763 | ||
a68ad5bd MM |
2764 | /* Update all of the primary and secondary vtables for T. Create new |
2765 | vtables as required, and initialize their RTTI information. Each | |
2766 | of the functions in OVERRIDDEN_VIRTUALS overrides a virtual | |
2767 | function from a base class; find and modify the appropriate entries | |
2768 | to point to the overriding functions. Returns a list, in | |
2769 | declaration order, of the functions that are overridden in this | |
2770 | class, but do not appear in the primary base class vtable, and | |
2771 | which should therefore be appended to the end of the vtable for T. */ | |
2772 | ||
2773 | static tree | |
da3d4dfa | 2774 | modify_all_vtables (t, vfuns_p, overridden_virtuals) |
8026246f | 2775 | tree t; |
da3d4dfa | 2776 | int *vfuns_p; |
a68ad5bd | 2777 | tree overridden_virtuals; |
8026246f | 2778 | { |
a68ad5bd | 2779 | tree binfo; |
8026246f | 2780 | |
a68ad5bd MM |
2781 | binfo = TYPE_BINFO (t); |
2782 | ||
5e19c053 MM |
2783 | /* Update all of the vtables. */ |
2784 | dfs_walk (binfo, | |
2785 | dfs_modify_vtables, | |
2786 | dfs_unmarked_real_bases_queue_p, | |
2787 | t); | |
2788 | dfs_walk (binfo, dfs_unmark, dfs_marked_real_bases_queue_p, t); | |
a68ad5bd MM |
2789 | |
2790 | /* If we should include overriding functions for secondary vtables | |
2791 | in our primary vtable, add them now. */ | |
2792 | if (all_overridden_vfuns_in_vtables_p ()) | |
2793 | { | |
2794 | tree *fnsp = &overridden_virtuals; | |
2795 | ||
2796 | while (*fnsp) | |
2797 | { | |
2798 | tree fn = TREE_VALUE (*fnsp); | |
2799 | ||
4e7512c9 MM |
2800 | if (!BINFO_VIRTUALS (binfo) |
2801 | || !value_member (fn, BINFO_VIRTUALS (binfo))) | |
a68ad5bd | 2802 | { |
a68ad5bd | 2803 | /* Set the vtable index. */ |
da3d4dfa | 2804 | set_vindex (t, fn, vfuns_p); |
a68ad5bd MM |
2805 | /* We don't need to convert to a base class when calling |
2806 | this function. */ | |
2807 | DECL_VIRTUAL_CONTEXT (fn) = t; | |
7d52ae23 | 2808 | |
a68ad5bd MM |
2809 | /* We don't need to adjust the `this' pointer when |
2810 | calling this function. */ | |
5e19c053 | 2811 | BV_DELTA (*fnsp) = integer_zero_node; |
aabb4cd6 | 2812 | BV_VCALL_INDEX (*fnsp) = NULL_TREE; |
a68ad5bd MM |
2813 | |
2814 | /* This is an overridden function not already in our | |
2815 | vtable. Keep it. */ | |
2816 | fnsp = &TREE_CHAIN (*fnsp); | |
2817 | } | |
2818 | else | |
2819 | /* We've already got an entry for this function. Skip | |
2820 | it. */ | |
2821 | *fnsp = TREE_CHAIN (*fnsp); | |
2822 | } | |
2823 | } | |
2824 | else | |
2825 | overridden_virtuals = NULL_TREE; | |
2826 | ||
2827 | return overridden_virtuals; | |
7177d104 MS |
2828 | } |
2829 | ||
39211cd5 MS |
2830 | /* Here, we already know that they match in every respect. |
2831 | All we have to check is where they had their declarations. */ | |
e92cc029 | 2832 | |
39211cd5 MS |
2833 | static int |
2834 | strictly_overrides (fndecl1, fndecl2) | |
2835 | tree fndecl1, fndecl2; | |
2836 | { | |
4f1c5b7d MM |
2837 | int distance = get_base_distance (DECL_CONTEXT (fndecl2), |
2838 | DECL_CONTEXT (fndecl1), | |
39211cd5 MS |
2839 | 0, (tree *)0); |
2840 | if (distance == -2 || distance > 0) | |
2841 | return 1; | |
2842 | return 0; | |
2843 | } | |
2844 | ||
9e9ff709 MS |
2845 | /* Get the base virtual function declarations in T that are either |
2846 | overridden or hidden by FNDECL as a list. We set TREE_PURPOSE with | |
2847 | the overrider/hider. */ | |
e92cc029 | 2848 | |
5ddc28a5 | 2849 | static tree |
9e9ff709 MS |
2850 | get_basefndecls (fndecl, t) |
2851 | tree fndecl, t; | |
2852 | { | |
2853 | tree methods = TYPE_METHODS (t); | |
2854 | tree base_fndecls = NULL_TREE; | |
2855 | tree binfos = BINFO_BASETYPES (TYPE_BINFO (t)); | |
2856 | int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2857 | ||
2858 | while (methods) | |
2859 | { | |
9e9ff709 MS |
2860 | if (TREE_CODE (methods) == FUNCTION_DECL |
2861 | && DECL_VINDEX (methods) != NULL_TREE | |
2862 | && DECL_NAME (fndecl) == DECL_NAME (methods)) | |
58010b57 | 2863 | base_fndecls = tree_cons (fndecl, methods, base_fndecls); |
9e9ff709 MS |
2864 | |
2865 | methods = TREE_CHAIN (methods); | |
2866 | } | |
2867 | ||
2868 | if (base_fndecls) | |
2869 | return base_fndecls; | |
2870 | ||
2871 | for (i = 0; i < n_baseclasses; i++) | |
2872 | { | |
2873 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
2874 | tree basetype = BINFO_TYPE (base_binfo); | |
9e9ff709 MS |
2875 | |
2876 | base_fndecls = chainon (get_basefndecls (fndecl, basetype), | |
2877 | base_fndecls); | |
2878 | } | |
2879 | ||
2880 | return base_fndecls; | |
2881 | } | |
2882 | ||
2883 | /* Mark the functions that have been hidden with their overriders. | |
2884 | Since we start out with all functions already marked with a hider, | |
a4832853 JM |
2885 | no need to mark functions that are just hidden. |
2886 | ||
2887 | Subroutine of warn_hidden. */ | |
e92cc029 | 2888 | |
bd6dd845 | 2889 | static void |
9e9ff709 MS |
2890 | mark_overriders (fndecl, base_fndecls) |
2891 | tree fndecl, base_fndecls; | |
2892 | { | |
a4832853 | 2893 | for (; base_fndecls; base_fndecls = TREE_CHAIN (base_fndecls)) |
9bab6c90 MM |
2894 | if (same_signature_p (fndecl, TREE_VALUE (base_fndecls))) |
2895 | TREE_PURPOSE (base_fndecls) = fndecl; | |
9e9ff709 MS |
2896 | } |
2897 | ||
2ee887f2 MS |
2898 | /* If this declaration supersedes the declaration of |
2899 | a method declared virtual in the base class, then | |
2900 | mark this field as being virtual as well. */ | |
2901 | ||
bd6dd845 | 2902 | static void |
cffa8729 | 2903 | check_for_override (decl, ctype) |
2ee887f2 MS |
2904 | tree decl, ctype; |
2905 | { | |
2906 | tree binfos = BINFO_BASETYPES (TYPE_BINFO (ctype)); | |
2907 | int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2908 | int virtualp = DECL_VIRTUAL_P (decl); | |
ed70c426 | 2909 | int found_overriden_fn = 0; |
2ee887f2 MS |
2910 | |
2911 | for (i = 0; i < n_baselinks; i++) | |
2912 | { | |
2913 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
4c6b7393 | 2914 | if (TYPE_POLYMORPHIC_P (BINFO_TYPE (base_binfo))) |
2ee887f2 MS |
2915 | { |
2916 | tree tmp = get_matching_virtual | |
0d9eb3ba | 2917 | (base_binfo, decl, DECL_DESTRUCTOR_P (decl)); |
ed70c426 MM |
2918 | |
2919 | if (tmp && !found_overriden_fn) | |
2ee887f2 MS |
2920 | { |
2921 | /* If this function overrides some virtual in some base | |
2922 | class, then the function itself is also necessarily | |
2923 | virtual, even if the user didn't explicitly say so. */ | |
2924 | DECL_VIRTUAL_P (decl) = 1; | |
2925 | ||
2926 | /* The TMP we really want is the one from the deepest | |
2927 | baseclass on this path, taking care not to | |
2928 | duplicate if we have already found it (via another | |
2929 | path to its virtual baseclass. */ | |
2930 | if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE) | |
2931 | { | |
4cc1d462 NS |
2932 | cp_error_at ("`static %#D' cannot be declared", decl); |
2933 | cp_error_at (" since `virtual %#D' declared in base class", | |
2ee887f2 MS |
2934 | tmp); |
2935 | break; | |
2936 | } | |
2937 | virtualp = 1; | |
2938 | ||
051e6fd7 MM |
2939 | /* Set DECL_VINDEX to a value that is neither an |
2940 | INTEGER_CST nor the error_mark_node so that | |
2941 | add_virtual_function will realize this is an | |
2942 | overridden function. */ | |
2943 | DECL_VINDEX (decl) | |
2944 | = tree_cons (tmp, NULL_TREE, DECL_VINDEX (decl)); | |
ed70c426 MM |
2945 | |
2946 | /* We now know that DECL overrides something, | |
2947 | which is all that is important. But, we must | |
2948 | continue to iterate through all the base-classes | |
2949 | in order to allow get_matching_virtual to check for | |
2950 | various illegal overrides. */ | |
2951 | found_overriden_fn = 1; | |
2ee887f2 MS |
2952 | } |
2953 | } | |
2954 | } | |
2955 | if (virtualp) | |
2956 | { | |
2957 | if (DECL_VINDEX (decl) == NULL_TREE) | |
2958 | DECL_VINDEX (decl) = error_mark_node; | |
2959 | IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1; | |
2960 | } | |
2961 | } | |
2962 | ||
fc378698 MS |
2963 | /* Warn about hidden virtual functions that are not overridden in t. |
2964 | We know that constructors and destructors don't apply. */ | |
e92cc029 | 2965 | |
9e9ff709 MS |
2966 | void |
2967 | warn_hidden (t) | |
2968 | tree t; | |
2969 | { | |
2970 | tree method_vec = CLASSTYPE_METHOD_VEC (t); | |
2971 | int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0; | |
2972 | int i; | |
2973 | ||
2974 | /* We go through each separately named virtual function. */ | |
61a127b3 | 2975 | for (i = 2; i < n_methods && TREE_VEC_ELT (method_vec, i); ++i) |
9e9ff709 | 2976 | { |
2b9dc906 | 2977 | tree fns = TREE_VEC_ELT (method_vec, i); |
a544cfd2 | 2978 | tree fndecl = NULL_TREE; |
9e9ff709 MS |
2979 | |
2980 | tree base_fndecls = NULL_TREE; | |
2981 | tree binfos = BINFO_BASETYPES (TYPE_BINFO (t)); | |
2982 | int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0; | |
2983 | ||
a4832853 JM |
2984 | /* First see if we have any virtual functions in this batch. */ |
2985 | for (; fns; fns = OVL_NEXT (fns)) | |
2986 | { | |
2987 | fndecl = OVL_CURRENT (fns); | |
2988 | if (DECL_VINDEX (fndecl)) | |
2989 | break; | |
2990 | } | |
2991 | ||
2992 | if (fns == NULL_TREE) | |
9e9ff709 MS |
2993 | continue; |
2994 | ||
2995 | /* First we get a list of all possible functions that might be | |
2996 | hidden from each base class. */ | |
2997 | for (i = 0; i < n_baseclasses; i++) | |
2998 | { | |
2999 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
3000 | tree basetype = BINFO_TYPE (base_binfo); | |
3001 | ||
3002 | base_fndecls = chainon (get_basefndecls (fndecl, basetype), | |
3003 | base_fndecls); | |
3004 | } | |
3005 | ||
2b9dc906 | 3006 | fns = OVL_NEXT (fns); |
9e9ff709 MS |
3007 | |
3008 | /* ...then mark up all the base functions with overriders, preferring | |
3009 | overriders to hiders. */ | |
3010 | if (base_fndecls) | |
a4832853 | 3011 | for (; fns; fns = OVL_NEXT (fns)) |
9e9ff709 | 3012 | { |
a4832853 JM |
3013 | fndecl = OVL_CURRENT (fns); |
3014 | if (DECL_VINDEX (fndecl)) | |
3015 | mark_overriders (fndecl, base_fndecls); | |
9e9ff709 MS |
3016 | } |
3017 | ||
3018 | /* Now give a warning for all base functions without overriders, | |
3019 | as they are hidden. */ | |
a4832853 | 3020 | for (; base_fndecls; base_fndecls = TREE_CHAIN (base_fndecls)) |
9bab6c90 MM |
3021 | if (!same_signature_p (TREE_PURPOSE (base_fndecls), |
3022 | TREE_VALUE (base_fndecls))) | |
3023 | { | |
3024 | /* Here we know it is a hider, and no overrider exists. */ | |
3025 | cp_warning_at ("`%D' was hidden", TREE_VALUE (base_fndecls)); | |
3026 | cp_warning_at (" by `%D'", TREE_PURPOSE (base_fndecls)); | |
3027 | } | |
9e9ff709 MS |
3028 | } |
3029 | } | |
3030 | ||
3031 | /* Check for things that are invalid. There are probably plenty of other | |
3032 | things we should check for also. */ | |
e92cc029 | 3033 | |
9e9ff709 MS |
3034 | static void |
3035 | finish_struct_anon (t) | |
3036 | tree t; | |
3037 | { | |
3038 | tree field; | |
f90cdf34 | 3039 | |
9e9ff709 MS |
3040 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) |
3041 | { | |
3042 | if (TREE_STATIC (field)) | |
3043 | continue; | |
3044 | if (TREE_CODE (field) != FIELD_DECL) | |
3045 | continue; | |
3046 | ||
3047 | if (DECL_NAME (field) == NULL_TREE | |
6bdb8141 | 3048 | && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
9e9ff709 | 3049 | { |
f90cdf34 MT |
3050 | tree elt = TYPE_FIELDS (TREE_TYPE (field)); |
3051 | for (; elt; elt = TREE_CHAIN (elt)) | |
9e9ff709 | 3052 | { |
f90cdf34 | 3053 | if (DECL_ARTIFICIAL (elt)) |
9e9ff709 MS |
3054 | continue; |
3055 | ||
f90cdf34 | 3056 | if (DECL_NAME (elt) == constructor_name (t)) |
cb9a3ff8 | 3057 | cp_pedwarn_at ("ISO C++ forbids member `%D' with same name as enclosing class", |
f90cdf34 | 3058 | elt); |
8ebeee52 | 3059 | |
f90cdf34 | 3060 | if (TREE_CODE (elt) != FIELD_DECL) |
8ebeee52 JM |
3061 | { |
3062 | cp_pedwarn_at ("`%#D' invalid; an anonymous union can only have non-static data members", | |
f90cdf34 | 3063 | elt); |
8ebeee52 JM |
3064 | continue; |
3065 | } | |
3066 | ||
f90cdf34 | 3067 | if (TREE_PRIVATE (elt)) |
8251199e | 3068 | cp_pedwarn_at ("private member `%#D' in anonymous union", |
f90cdf34 MT |
3069 | elt); |
3070 | else if (TREE_PROTECTED (elt)) | |
8251199e | 3071 | cp_pedwarn_at ("protected member `%#D' in anonymous union", |
f90cdf34 | 3072 | elt); |
fc378698 | 3073 | |
f90cdf34 MT |
3074 | TREE_PRIVATE (elt) = TREE_PRIVATE (field); |
3075 | TREE_PROTECTED (elt) = TREE_PROTECTED (field); | |
9e9ff709 MS |
3076 | } |
3077 | } | |
3078 | } | |
3079 | } | |
3080 | ||
61a127b3 MM |
3081 | /* Create default constructors, assignment operators, and so forth for |
3082 | the type indicated by T, if they are needed. | |
3083 | CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and | |
9eb71d8c MM |
3084 | CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, the |
3085 | class cannot have a default constructor, copy constructor taking a | |
3086 | const reference argument, or an assignment operator taking a const | |
3087 | reference, respectively. If a virtual destructor is created, its | |
3088 | DECL is returned; otherwise the return value is NULL_TREE. */ | |
61a127b3 MM |
3089 | |
3090 | static tree | |
3091 | add_implicitly_declared_members (t, cant_have_default_ctor, | |
3092 | cant_have_const_cctor, | |
9eb71d8c | 3093 | cant_have_const_assignment) |
61a127b3 MM |
3094 | tree t; |
3095 | int cant_have_default_ctor; | |
3096 | int cant_have_const_cctor; | |
9eb71d8c | 3097 | int cant_have_const_assignment; |
61a127b3 MM |
3098 | { |
3099 | tree default_fn; | |
3100 | tree implicit_fns = NULL_TREE; | |
61a127b3 MM |
3101 | tree virtual_dtor = NULL_TREE; |
3102 | tree *f; | |
3103 | ||
3104 | /* Destructor. */ | |
834c6dff | 3105 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t)) |
61a127b3 | 3106 | { |
9eb71d8c | 3107 | default_fn = implicitly_declare_fn (sfk_destructor, t, /*const_p=*/0); |
61a127b3 MM |
3108 | check_for_override (default_fn, t); |
3109 | ||
3110 | /* If we couldn't make it work, then pretend we didn't need it. */ | |
3111 | if (default_fn == void_type_node) | |
834c6dff | 3112 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 0; |
61a127b3 MM |
3113 | else |
3114 | { | |
3115 | TREE_CHAIN (default_fn) = implicit_fns; | |
3116 | implicit_fns = default_fn; | |
3117 | ||
3118 | if (DECL_VINDEX (default_fn)) | |
3119 | virtual_dtor = default_fn; | |
3120 | } | |
3121 | } | |
834c6dff MM |
3122 | else |
3123 | /* Any non-implicit destructor is non-trivial. */ | |
3124 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t); | |
61a127b3 MM |
3125 | |
3126 | /* Default constructor. */ | |
6eabb241 | 3127 | if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor) |
61a127b3 | 3128 | { |
9eb71d8c | 3129 | default_fn = implicitly_declare_fn (sfk_constructor, t, /*const_p=*/0); |
61a127b3 MM |
3130 | TREE_CHAIN (default_fn) = implicit_fns; |
3131 | implicit_fns = default_fn; | |
3132 | } | |
3133 | ||
3134 | /* Copy constructor. */ | |
6eabb241 | 3135 | if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 MM |
3136 | { |
3137 | /* ARM 12.18: You get either X(X&) or X(const X&), but | |
3138 | not both. --Chip */ | |
9eb71d8c MM |
3139 | default_fn |
3140 | = implicitly_declare_fn (sfk_copy_constructor, t, | |
3141 | /*const_p=*/!cant_have_const_cctor); | |
61a127b3 MM |
3142 | TREE_CHAIN (default_fn) = implicit_fns; |
3143 | implicit_fns = default_fn; | |
3144 | } | |
3145 | ||
3146 | /* Assignment operator. */ | |
6eabb241 | 3147 | if (! TYPE_HAS_ASSIGN_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 | 3148 | { |
9eb71d8c MM |
3149 | default_fn |
3150 | = implicitly_declare_fn (sfk_assignment_operator, t, | |
3151 | /*const_p=*/!cant_have_const_assignment); | |
61a127b3 MM |
3152 | TREE_CHAIN (default_fn) = implicit_fns; |
3153 | implicit_fns = default_fn; | |
3154 | } | |
3155 | ||
3156 | /* Now, hook all of the new functions on to TYPE_METHODS, | |
3157 | and add them to the CLASSTYPE_METHOD_VEC. */ | |
3158 | for (f = &implicit_fns; *f; f = &TREE_CHAIN (*f)) | |
452a394b | 3159 | add_method (t, *f, /*error_p=*/0); |
61a127b3 MM |
3160 | *f = TYPE_METHODS (t); |
3161 | TYPE_METHODS (t) = implicit_fns; | |
3162 | ||
3163 | return virtual_dtor; | |
3164 | } | |
3165 | ||
f90cdf34 MT |
3166 | /* Subroutine of finish_struct_1. Recursively count the number of fields |
3167 | in TYPE, including anonymous union members. */ | |
3168 | ||
3169 | static int | |
3170 | count_fields (fields) | |
3171 | tree fields; | |
3172 | { | |
3173 | tree x; | |
3174 | int n_fields = 0; | |
3175 | for (x = fields; x; x = TREE_CHAIN (x)) | |
3176 | { | |
3177 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
3178 | n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x))); | |
3179 | else | |
3180 | n_fields += 1; | |
3181 | } | |
3182 | return n_fields; | |
3183 | } | |
3184 | ||
3185 | /* Subroutine of finish_struct_1. Recursively add all the fields in the | |
3186 | TREE_LIST FIELDS to the TREE_VEC FIELD_VEC, starting at offset IDX. */ | |
3187 | ||
3188 | static int | |
3189 | add_fields_to_vec (fields, field_vec, idx) | |
3190 | tree fields, field_vec; | |
3191 | int idx; | |
3192 | { | |
3193 | tree x; | |
3194 | for (x = fields; x; x = TREE_CHAIN (x)) | |
3195 | { | |
3196 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
3197 | idx = add_fields_to_vec (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx); | |
3198 | else | |
3199 | TREE_VEC_ELT (field_vec, idx++) = x; | |
3200 | } | |
3201 | return idx; | |
3202 | } | |
3203 | ||
1e30f9b4 MM |
3204 | /* FIELD is a bit-field. We are finishing the processing for its |
3205 | enclosing type. Issue any appropriate messages and set appropriate | |
3206 | flags. */ | |
3207 | ||
3208 | static void | |
3209 | check_bitfield_decl (field) | |
3210 | tree field; | |
3211 | { | |
3212 | tree type = TREE_TYPE (field); | |
cd8ed629 | 3213 | tree w = NULL_TREE; |
1e30f9b4 | 3214 | |
cd8ed629 | 3215 | /* Detect invalid bit-field type. */ |
1e30f9b4 MM |
3216 | if (DECL_INITIAL (field) |
3217 | && ! INTEGRAL_TYPE_P (TREE_TYPE (field))) | |
3218 | { | |
3219 | cp_error_at ("bit-field `%#D' with non-integral type", field); | |
cd8ed629 | 3220 | w = error_mark_node; |
1e30f9b4 MM |
3221 | } |
3222 | ||
3223 | /* Detect and ignore out of range field width. */ | |
3224 | if (DECL_INITIAL (field)) | |
3225 | { | |
cd8ed629 | 3226 | w = DECL_INITIAL (field); |
1e30f9b4 MM |
3227 | |
3228 | /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */ | |
3229 | STRIP_NOPS (w); | |
3230 | ||
3231 | /* detect invalid field size. */ | |
3232 | if (TREE_CODE (w) == CONST_DECL) | |
3233 | w = DECL_INITIAL (w); | |
fc611ce0 | 3234 | else |
1e30f9b4 MM |
3235 | w = decl_constant_value (w); |
3236 | ||
3237 | if (TREE_CODE (w) != INTEGER_CST) | |
3238 | { | |
3239 | cp_error_at ("bit-field `%D' width not an integer constant", | |
3240 | field); | |
cd8ed629 | 3241 | w = error_mark_node; |
1e30f9b4 | 3242 | } |
05bccae2 | 3243 | else if (tree_int_cst_sgn (w) < 0) |
1e30f9b4 | 3244 | { |
1e30f9b4 | 3245 | cp_error_at ("negative width in bit-field `%D'", field); |
cd8ed629 | 3246 | w = error_mark_node; |
1e30f9b4 | 3247 | } |
05bccae2 | 3248 | else if (integer_zerop (w) && DECL_NAME (field) != 0) |
1e30f9b4 | 3249 | { |
1e30f9b4 | 3250 | cp_error_at ("zero width for bit-field `%D'", field); |
cd8ed629 | 3251 | w = error_mark_node; |
1e30f9b4 | 3252 | } |
05bccae2 | 3253 | else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0 |
1e30f9b4 MM |
3254 | && TREE_CODE (type) != ENUMERAL_TYPE |
3255 | && TREE_CODE (type) != BOOLEAN_TYPE) | |
3256 | cp_warning_at ("width of `%D' exceeds its type", field); | |
3257 | else if (TREE_CODE (type) == ENUMERAL_TYPE | |
05bccae2 RK |
3258 | && (0 > compare_tree_int (w, |
3259 | min_precision (TYPE_MIN_VALUE (type), | |
3260 | TREE_UNSIGNED (type))) | |
3261 | || 0 > compare_tree_int (w, | |
3262 | min_precision | |
3263 | (TYPE_MAX_VALUE (type), | |
3264 | TREE_UNSIGNED (type))))) | |
1e30f9b4 MM |
3265 | cp_warning_at ("`%D' is too small to hold all values of `%#T'", |
3266 | field, type); | |
cd8ed629 MM |
3267 | } |
3268 | ||
3269 | /* Remove the bit-field width indicator so that the rest of the | |
3270 | compiler does not treat that value as an initializer. */ | |
3271 | DECL_INITIAL (field) = NULL_TREE; | |
1e30f9b4 | 3272 | |
cd8ed629 MM |
3273 | if (w != error_mark_node) |
3274 | { | |
3275 | DECL_SIZE (field) = convert (bitsizetype, w); | |
3276 | DECL_BIT_FIELD (field) = 1; | |
1e30f9b4 | 3277 | |
cd8ed629 MM |
3278 | if (integer_zerop (w)) |
3279 | { | |
1e30f9b4 | 3280 | #ifdef EMPTY_FIELD_BOUNDARY |
cd8ed629 MM |
3281 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), |
3282 | EMPTY_FIELD_BOUNDARY); | |
1e30f9b4 MM |
3283 | #endif |
3284 | #ifdef PCC_BITFIELD_TYPE_MATTERS | |
cd8ed629 | 3285 | if (PCC_BITFIELD_TYPE_MATTERS) |
11cf4d18 JJ |
3286 | { |
3287 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), | |
3288 | TYPE_ALIGN (type)); | |
3289 | DECL_USER_ALIGN (field) |= TYPE_USER_ALIGN (type); | |
3290 | } | |
1e30f9b4 | 3291 | #endif |
1e30f9b4 MM |
3292 | } |
3293 | } | |
3294 | else | |
cd8ed629 MM |
3295 | { |
3296 | /* Non-bit-fields are aligned for their type. */ | |
3297 | DECL_BIT_FIELD (field) = 0; | |
3298 | CLEAR_DECL_C_BIT_FIELD (field); | |
3299 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), TYPE_ALIGN (type)); | |
11cf4d18 | 3300 | DECL_USER_ALIGN (field) |= TYPE_USER_ALIGN (type); |
cd8ed629 | 3301 | } |
1e30f9b4 MM |
3302 | } |
3303 | ||
3304 | /* FIELD is a non bit-field. We are finishing the processing for its | |
3305 | enclosing type T. Issue any appropriate messages and set appropriate | |
3306 | flags. */ | |
3307 | ||
3308 | static void | |
3309 | check_field_decl (field, t, cant_have_const_ctor, | |
3310 | cant_have_default_ctor, no_const_asn_ref, | |
3311 | any_default_members) | |
3312 | tree field; | |
3313 | tree t; | |
3314 | int *cant_have_const_ctor; | |
3315 | int *cant_have_default_ctor; | |
3316 | int *no_const_asn_ref; | |
3317 | int *any_default_members; | |
3318 | { | |
3319 | tree type = strip_array_types (TREE_TYPE (field)); | |
3320 | ||
3321 | /* An anonymous union cannot contain any fields which would change | |
3322 | the settings of CANT_HAVE_CONST_CTOR and friends. */ | |
3323 | if (ANON_UNION_TYPE_P (type)) | |
3324 | ; | |
3325 | /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous | |
3326 | structs. So, we recurse through their fields here. */ | |
3327 | else if (ANON_AGGR_TYPE_P (type)) | |
3328 | { | |
3329 | tree fields; | |
3330 | ||
3331 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
17aec3eb | 3332 | if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field)) |
1e30f9b4 MM |
3333 | check_field_decl (fields, t, cant_have_const_ctor, |
3334 | cant_have_default_ctor, no_const_asn_ref, | |
3335 | any_default_members); | |
3336 | } | |
3337 | /* Check members with class type for constructors, destructors, | |
3338 | etc. */ | |
3339 | else if (CLASS_TYPE_P (type)) | |
3340 | { | |
3341 | /* Never let anything with uninheritable virtuals | |
3342 | make it through without complaint. */ | |
3343 | abstract_virtuals_error (field, type); | |
3344 | ||
3345 | if (TREE_CODE (t) == UNION_TYPE) | |
3346 | { | |
3347 | if (TYPE_NEEDS_CONSTRUCTING (type)) | |
3348 | cp_error_at ("member `%#D' with constructor not allowed in union", | |
3349 | field); | |
834c6dff | 3350 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) |
1e30f9b4 MM |
3351 | cp_error_at ("member `%#D' with destructor not allowed in union", |
3352 | field); | |
3353 | if (TYPE_HAS_COMPLEX_ASSIGN_REF (type)) | |
3354 | cp_error_at ("member `%#D' with copy assignment operator not allowed in union", | |
3355 | field); | |
3356 | } | |
3357 | else | |
3358 | { | |
3359 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type); | |
834c6dff MM |
3360 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
3361 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type); | |
1e30f9b4 MM |
3362 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type); |
3363 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type); | |
3364 | } | |
3365 | ||
3366 | if (!TYPE_HAS_CONST_INIT_REF (type)) | |
3367 | *cant_have_const_ctor = 1; | |
3368 | ||
3369 | if (!TYPE_HAS_CONST_ASSIGN_REF (type)) | |
3370 | *no_const_asn_ref = 1; | |
3371 | ||
3372 | if (TYPE_HAS_CONSTRUCTOR (type) | |
3373 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) | |
3374 | *cant_have_default_ctor = 1; | |
3375 | } | |
3376 | if (DECL_INITIAL (field) != NULL_TREE) | |
3377 | { | |
3378 | /* `build_class_init_list' does not recognize | |
3379 | non-FIELD_DECLs. */ | |
3380 | if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0) | |
3381 | cp_error_at ("multiple fields in union `%T' initialized"); | |
3382 | *any_default_members = 1; | |
3383 | } | |
3384 | ||
3385 | /* Non-bit-fields are aligned for their type, except packed fields | |
3386 | which require only BITS_PER_UNIT alignment. */ | |
3387 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), | |
3388 | (DECL_PACKED (field) | |
3389 | ? BITS_PER_UNIT | |
3390 | : TYPE_ALIGN (TREE_TYPE (field)))); | |
11cf4d18 JJ |
3391 | if (! DECL_PACKED (field)) |
3392 | DECL_USER_ALIGN (field) |= TYPE_USER_ALIGN (TREE_TYPE (field)); | |
6bb88f3b | 3393 | } |
1e30f9b4 | 3394 | |
08b962b0 MM |
3395 | /* Check the data members (both static and non-static), class-scoped |
3396 | typedefs, etc., appearing in the declaration of T. Issue | |
3397 | appropriate diagnostics. Sets ACCESS_DECLS to a list (in | |
3398 | declaration order) of access declarations; each TREE_VALUE in this | |
3399 | list is a USING_DECL. | |
8d08fdba | 3400 | |
08b962b0 | 3401 | In addition, set the following flags: |
8d08fdba | 3402 | |
08b962b0 MM |
3403 | EMPTY_P |
3404 | The class is empty, i.e., contains no non-static data members. | |
8d08fdba | 3405 | |
08b962b0 MM |
3406 | CANT_HAVE_DEFAULT_CTOR_P |
3407 | This class cannot have an implicitly generated default | |
3408 | constructor. | |
8d08fdba | 3409 | |
08b962b0 MM |
3410 | CANT_HAVE_CONST_CTOR_P |
3411 | This class cannot have an implicitly generated copy constructor | |
3412 | taking a const reference. | |
8d08fdba | 3413 | |
08b962b0 MM |
3414 | CANT_HAVE_CONST_ASN_REF |
3415 | This class cannot have an implicitly generated assignment | |
3416 | operator taking a const reference. | |
8d08fdba | 3417 | |
08b962b0 MM |
3418 | All of these flags should be initialized before calling this |
3419 | function. | |
8d08fdba | 3420 | |
08b962b0 MM |
3421 | Returns a pointer to the end of the TYPE_FIELDs chain; additional |
3422 | fields can be added by adding to this chain. */ | |
8d08fdba | 3423 | |
607cf131 | 3424 | static void |
08b962b0 MM |
3425 | check_field_decls (t, access_decls, empty_p, |
3426 | cant_have_default_ctor_p, cant_have_const_ctor_p, | |
3427 | no_const_asn_ref_p) | |
3428 | tree t; | |
3429 | tree *access_decls; | |
3430 | int *empty_p; | |
3431 | int *cant_have_default_ctor_p; | |
3432 | int *cant_have_const_ctor_p; | |
3433 | int *no_const_asn_ref_p; | |
3434 | { | |
3435 | tree *field; | |
3436 | tree *next; | |
3437 | int has_pointers; | |
3438 | int any_default_members; | |
3439 | ||
58010b57 MM |
3440 | /* First, delete any duplicate fields. */ |
3441 | delete_duplicate_fields (TYPE_FIELDS (t)); | |
3442 | ||
08b962b0 MM |
3443 | /* Assume there are no access declarations. */ |
3444 | *access_decls = NULL_TREE; | |
3445 | /* Assume this class has no pointer members. */ | |
3446 | has_pointers = 0; | |
3447 | /* Assume none of the members of this class have default | |
3448 | initializations. */ | |
3449 | any_default_members = 0; | |
3450 | ||
3451 | for (field = &TYPE_FIELDS (t); *field; field = next) | |
8d08fdba | 3452 | { |
08b962b0 MM |
3453 | tree x = *field; |
3454 | tree type = TREE_TYPE (x); | |
8d08fdba | 3455 | |
f30432d7 | 3456 | GNU_xref_member (current_class_name, x); |
8d08fdba | 3457 | |
08b962b0 | 3458 | next = &TREE_CHAIN (x); |
8d08fdba | 3459 | |
c91a56d2 | 3460 | if (TREE_CODE (x) == FIELD_DECL) |
691c003d MS |
3461 | { |
3462 | DECL_PACKED (x) |= TYPE_PACKED (t); | |
e6267549 JM |
3463 | |
3464 | if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x))) | |
08b962b0 MM |
3465 | /* We don't treat zero-width bitfields as making a class |
3466 | non-empty. */ | |
3467 | ; | |
e6267549 | 3468 | else |
f9c528ea MM |
3469 | { |
3470 | /* The class is non-empty. */ | |
3471 | *empty_p = 0; | |
3472 | /* The class is not even nearly empty. */ | |
3473 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3474 | } | |
691c003d | 3475 | } |
c91a56d2 | 3476 | |
cffa8729 | 3477 | if (TREE_CODE (x) == USING_DECL) |
f30432d7 | 3478 | { |
08b962b0 MM |
3479 | /* Prune the access declaration from the list of fields. */ |
3480 | *field = TREE_CHAIN (x); | |
3481 | ||
3482 | /* Save the access declarations for our caller. */ | |
3483 | *access_decls = tree_cons (NULL_TREE, x, *access_decls); | |
3484 | ||
3485 | /* Since we've reset *FIELD there's no reason to skip to the | |
3486 | next field. */ | |
3487 | next = field; | |
f30432d7 MS |
3488 | continue; |
3489 | } | |
8d08fdba | 3490 | |
050367a3 MM |
3491 | if (TREE_CODE (x) == TYPE_DECL |
3492 | || TREE_CODE (x) == TEMPLATE_DECL) | |
f30432d7 | 3493 | continue; |
8d08fdba | 3494 | |
f30432d7 | 3495 | /* If we've gotten this far, it's a data member, possibly static, |
e92cc029 | 3496 | or an enumerator. */ |
8d08fdba | 3497 | |
17aec3eb | 3498 | DECL_CONTEXT (x) = t; |
8d08fdba | 3499 | |
f30432d7 MS |
3500 | /* ``A local class cannot have static data members.'' ARM 9.4 */ |
3501 | if (current_function_decl && TREE_STATIC (x)) | |
8251199e | 3502 | cp_error_at ("field `%D' in local class cannot be static", x); |
8d08fdba | 3503 | |
f30432d7 MS |
3504 | /* Perform error checking that did not get done in |
3505 | grokdeclarator. */ | |
52fb2769 | 3506 | if (TREE_CODE (type) == FUNCTION_TYPE) |
f30432d7 | 3507 | { |
8251199e | 3508 | cp_error_at ("field `%D' invalidly declared function type", |
f30432d7 | 3509 | x); |
52fb2769 NS |
3510 | type = build_pointer_type (type); |
3511 | TREE_TYPE (x) = type; | |
f30432d7 | 3512 | } |
52fb2769 | 3513 | else if (TREE_CODE (type) == METHOD_TYPE) |
f30432d7 | 3514 | { |
8251199e | 3515 | cp_error_at ("field `%D' invalidly declared method type", x); |
52fb2769 NS |
3516 | type = build_pointer_type (type); |
3517 | TREE_TYPE (x) = type; | |
f30432d7 | 3518 | } |
52fb2769 | 3519 | else if (TREE_CODE (type) == OFFSET_TYPE) |
f30432d7 | 3520 | { |
8251199e | 3521 | cp_error_at ("field `%D' invalidly declared offset type", x); |
52fb2769 NS |
3522 | type = build_pointer_type (type); |
3523 | TREE_TYPE (x) = type; | |
f30432d7 | 3524 | } |
8d08fdba | 3525 | |
52fb2769 | 3526 | if (type == error_mark_node) |
f30432d7 | 3527 | continue; |
8d08fdba | 3528 | |
f30432d7 MS |
3529 | /* When this goes into scope, it will be a non-local reference. */ |
3530 | DECL_NONLOCAL (x) = 1; | |
8d08fdba | 3531 | |
f30432d7 MS |
3532 | if (TREE_CODE (x) == CONST_DECL) |
3533 | continue; | |
8d08fdba | 3534 | |
f30432d7 MS |
3535 | if (TREE_CODE (x) == VAR_DECL) |
3536 | { | |
3537 | if (TREE_CODE (t) == UNION_TYPE) | |
3538 | /* Unions cannot have static members. */ | |
8251199e | 3539 | cp_error_at ("field `%D' declared static in union", x); |
8d08fdba | 3540 | |
f30432d7 MS |
3541 | continue; |
3542 | } | |
8d08fdba | 3543 | |
f30432d7 | 3544 | /* Now it can only be a FIELD_DECL. */ |
8d08fdba | 3545 | |
f30432d7 | 3546 | if (TREE_PRIVATE (x) || TREE_PROTECTED (x)) |
08b962b0 | 3547 | CLASSTYPE_NON_AGGREGATE (t) = 1; |
8d08fdba | 3548 | |
f30432d7 MS |
3549 | /* If this is of reference type, check if it needs an init. |
3550 | Also do a little ANSI jig if necessary. */ | |
52fb2769 | 3551 | if (TREE_CODE (type) == REFERENCE_TYPE) |
f30432d7 | 3552 | { |
08b962b0 | 3553 | CLASSTYPE_NON_POD_P (t) = 1; |
f30432d7 | 3554 | if (DECL_INITIAL (x) == NULL_TREE) |
08b962b0 | 3555 | CLASSTYPE_REF_FIELDS_NEED_INIT (t) = 1; |
8d08fdba | 3556 | |
f30432d7 MS |
3557 | /* ARM $12.6.2: [A member initializer list] (or, for an |
3558 | aggregate, initialization by a brace-enclosed list) is the | |
3559 | only way to initialize nonstatic const and reference | |
3560 | members. */ | |
08b962b0 | 3561 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3562 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 MS |
3563 | |
3564 | if (! TYPE_HAS_CONSTRUCTOR (t) && extra_warnings) | |
3565 | { | |
3566 | if (DECL_NAME (x)) | |
8251199e | 3567 | cp_warning_at ("non-static reference `%#D' in class without a constructor", x); |
f30432d7 | 3568 | else |
8251199e | 3569 | cp_warning_at ("non-static reference in class without a constructor", x); |
8d08fdba | 3570 | } |
f30432d7 | 3571 | } |
8d08fdba | 3572 | |
1e30f9b4 | 3573 | type = strip_array_types (type); |
52fb2769 NS |
3574 | |
3575 | if (TREE_CODE (type) == POINTER_TYPE) | |
824b9a4c MS |
3576 | has_pointers = 1; |
3577 | ||
52fb2769 | 3578 | if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type)) |
08b962b0 | 3579 | CLASSTYPE_HAS_MUTABLE (t) = 1; |
a7a7710d | 3580 | |
c4d6cee3 JM |
3581 | if (! pod_type_p (type) |
3582 | /* For some reason, pointers to members are POD types themselves, | |
3583 | but are not allowed in POD structs. Silly. */ | |
3584 | || TYPE_PTRMEM_P (type) || TYPE_PTRMEMFUNC_P (type)) | |
08b962b0 | 3585 | CLASSTYPE_NON_POD_P (t) = 1; |
52fb2769 | 3586 | |
f30432d7 | 3587 | /* If any field is const, the structure type is pseudo-const. */ |
52fb2769 | 3588 | if (CP_TYPE_CONST_P (type)) |
f30432d7 MS |
3589 | { |
3590 | C_TYPE_FIELDS_READONLY (t) = 1; | |
3591 | if (DECL_INITIAL (x) == NULL_TREE) | |
08b962b0 | 3592 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) = 1; |
f30432d7 MS |
3593 | |
3594 | /* ARM $12.6.2: [A member initializer list] (or, for an | |
3595 | aggregate, initialization by a brace-enclosed list) is the | |
3596 | only way to initialize nonstatic const and reference | |
3597 | members. */ | |
08b962b0 | 3598 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3599 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3600 | |
6eabb241 | 3601 | if (! TYPE_HAS_CONSTRUCTOR (t) && extra_warnings) |
f30432d7 MS |
3602 | { |
3603 | if (DECL_NAME (x)) | |
8251199e | 3604 | cp_warning_at ("non-static const member `%#D' in class without a constructor", x); |
f30432d7 | 3605 | else |
8251199e | 3606 | cp_warning_at ("non-static const member in class without a constructor", x); |
f30432d7 MS |
3607 | } |
3608 | } | |
08b962b0 MM |
3609 | /* A field that is pseudo-const makes the structure likewise. */ |
3610 | else if (IS_AGGR_TYPE (type)) | |
f30432d7 | 3611 | { |
08b962b0 MM |
3612 | C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type); |
3613 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) | |
3614 | |= CLASSTYPE_READONLY_FIELDS_NEED_INIT (type); | |
f30432d7 | 3615 | } |
8d08fdba | 3616 | |
c10bffd0 JM |
3617 | /* Core issue 80: A nonstatic data member is required to have a |
3618 | different name from the class iff the class has a | |
3619 | user-defined constructor. */ | |
3620 | if (DECL_NAME (x) == constructor_name (t) | |
3621 | && TYPE_HAS_CONSTRUCTOR (t)) | |
d80c3489 | 3622 | cp_pedwarn_at ("field `%#D' with same name as class", x); |
c10bffd0 | 3623 | |
162bc98d JM |
3624 | /* We set DECL_C_BIT_FIELD in grokbitfield. |
3625 | If the type and width are valid, we'll also set DECL_BIT_FIELD. */ | |
3626 | if (DECL_C_BIT_FIELD (x)) | |
1e30f9b4 | 3627 | check_bitfield_decl (x); |
f30432d7 | 3628 | else |
1e30f9b4 | 3629 | check_field_decl (x, t, |
08b962b0 MM |
3630 | cant_have_const_ctor_p, |
3631 | cant_have_default_ctor_p, | |
3632 | no_const_asn_ref_p, | |
1e30f9b4 | 3633 | &any_default_members); |
8d08fdba MS |
3634 | } |
3635 | ||
824b9a4c | 3636 | /* Effective C++ rule 11. */ |
7834ab39 | 3637 | if (has_pointers && warn_ecpp && TYPE_HAS_CONSTRUCTOR (t) |
824b9a4c MS |
3638 | && ! (TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t))) |
3639 | { | |
8251199e | 3640 | cp_warning ("`%#T' has pointer data members", t); |
824b9a4c MS |
3641 | |
3642 | if (! TYPE_HAS_INIT_REF (t)) | |
3643 | { | |
8251199e | 3644 | cp_warning (" but does not override `%T(const %T&)'", t, t); |
824b9a4c | 3645 | if (! TYPE_HAS_ASSIGN_REF (t)) |
8251199e | 3646 | cp_warning (" or `operator=(const %T&)'", t); |
824b9a4c MS |
3647 | } |
3648 | else if (! TYPE_HAS_ASSIGN_REF (t)) | |
8251199e | 3649 | cp_warning (" but does not override `operator=(const %T&)'", t); |
824b9a4c | 3650 | } |
08b962b0 | 3651 | |
607cf131 MM |
3652 | |
3653 | /* Check anonymous struct/anonymous union fields. */ | |
3654 | finish_struct_anon (t); | |
3655 | ||
08b962b0 MM |
3656 | /* We've built up the list of access declarations in reverse order. |
3657 | Fix that now. */ | |
3658 | *access_decls = nreverse (*access_decls); | |
08b962b0 MM |
3659 | } |
3660 | ||
58010b57 MM |
3661 | /* Return a FIELD_DECL for a pointer-to-virtual-table or |
3662 | pointer-to-virtual-base. The NAME, ASSEMBLER_NAME, and TYPE of the | |
3663 | field are as indicated. The CLASS_TYPE in which this field occurs | |
07a3462a JW |
3664 | is also indicated. FCONTEXT is the type that is needed for the debug |
3665 | info output routines. *EMPTY_P is set to a non-zero value by this | |
58010b57 MM |
3666 | function to indicate that a class containing this field is |
3667 | non-empty. */ | |
3668 | ||
3669 | static tree | |
07a3462a | 3670 | build_vtbl_or_vbase_field (name, assembler_name, type, class_type, fcontext, |
58010b57 MM |
3671 | empty_p) |
3672 | tree name; | |
3673 | tree assembler_name; | |
3674 | tree type; | |
3675 | tree class_type; | |
07a3462a | 3676 | tree fcontext; |
58010b57 MM |
3677 | int *empty_p; |
3678 | { | |
3679 | tree field; | |
3680 | ||
3681 | /* This class is non-empty. */ | |
3682 | *empty_p = 0; | |
3683 | ||
3684 | /* Build the FIELD_DECL. */ | |
721c3b42 | 3685 | field = build_decl (FIELD_DECL, name, type); |
58010b57 MM |
3686 | DECL_ASSEMBLER_NAME (field) = assembler_name; |
3687 | DECL_VIRTUAL_P (field) = 1; | |
3688 | DECL_ARTIFICIAL (field) = 1; | |
3689 | DECL_FIELD_CONTEXT (field) = class_type; | |
07a3462a | 3690 | DECL_FCONTEXT (field) = fcontext; |
58010b57 | 3691 | DECL_ALIGN (field) = TYPE_ALIGN (type); |
11cf4d18 | 3692 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (type); |
58010b57 MM |
3693 | |
3694 | /* Return it. */ | |
3695 | return field; | |
3696 | } | |
3697 | ||
5c24fba6 MM |
3698 | /* Record the type of BINFO in the slot in DATA (which is really a |
3699 | `varray_type *') corresponding to the BINFO_OFFSET. */ | |
607cf131 | 3700 | |
5c24fba6 MM |
3701 | static tree |
3702 | dfs_record_base_offsets (binfo, data) | |
3703 | tree binfo; | |
3704 | void *data; | |
3705 | { | |
3706 | varray_type *v; | |
770ae6cc | 3707 | unsigned HOST_WIDE_INT offset = tree_low_cst (BINFO_OFFSET (binfo), 1); |
5c24fba6 MM |
3708 | |
3709 | v = (varray_type *) data; | |
3710 | while (VARRAY_SIZE (*v) <= offset) | |
3711 | VARRAY_GROW (*v, 2 * VARRAY_SIZE (*v)); | |
3712 | VARRAY_TREE (*v, offset) = tree_cons (NULL_TREE, | |
3713 | BINFO_TYPE (binfo), | |
3714 | VARRAY_TREE (*v, offset)); | |
3715 | ||
3716 | return NULL_TREE; | |
607cf131 MM |
3717 | } |
3718 | ||
9785e4b1 MM |
3719 | /* Add the offset of BINFO and its bases to BASE_OFFSETS. */ |
3720 | ||
3721 | static void | |
3722 | record_base_offsets (binfo, base_offsets) | |
3723 | tree binfo; | |
3724 | varray_type *base_offsets; | |
3725 | { | |
9785e4b1 MM |
3726 | dfs_walk (binfo, |
3727 | dfs_record_base_offsets, | |
3728 | dfs_skip_vbases, | |
3729 | base_offsets); | |
9785e4b1 MM |
3730 | } |
3731 | ||
5c24fba6 MM |
3732 | /* Returns non-NULL if there is already an entry in DATA (which is |
3733 | really a `varray_type') indicating that an object with the same | |
3734 | type of BINFO is already at the BINFO_OFFSET for BINFO. */ | |
d77249e7 MM |
3735 | |
3736 | static tree | |
5c24fba6 MM |
3737 | dfs_search_base_offsets (binfo, data) |
3738 | tree binfo; | |
3739 | void *data; | |
3740 | { | |
3741 | if (is_empty_class (BINFO_TYPE (binfo))) | |
3742 | { | |
3743 | varray_type v = (varray_type) data; | |
770ae6cc RK |
3744 | /* Find the offset for this BINFO. */ |
3745 | unsigned HOST_WIDE_INT offset = tree_low_cst (BINFO_OFFSET (binfo), 1); | |
5c24fba6 MM |
3746 | tree t; |
3747 | ||
5c24fba6 MM |
3748 | /* If we haven't yet encountered any objects at offsets that |
3749 | big, then there's no conflict. */ | |
3750 | if (VARRAY_SIZE (v) <= offset) | |
3751 | return NULL_TREE; | |
3752 | /* Otherwise, go through the objects already allocated at this | |
3753 | offset. */ | |
3754 | for (t = VARRAY_TREE (v, offset); t; t = TREE_CHAIN (t)) | |
3755 | if (same_type_p (TREE_VALUE (t), BINFO_TYPE (binfo))) | |
3756 | return binfo; | |
3757 | } | |
3758 | ||
3759 | return NULL_TREE; | |
3760 | } | |
3761 | ||
9785e4b1 MM |
3762 | /* Returns non-zero if there's a conflict between BINFO and a base |
3763 | already mentioned in BASE_OFFSETS if BINFO is placed at its current | |
3764 | BINFO_OFFSET. */ | |
3765 | ||
3766 | static int | |
3767 | layout_conflict_p (binfo, base_offsets) | |
3768 | tree binfo; | |
3769 | varray_type base_offsets; | |
3770 | { | |
3771 | return dfs_walk (binfo, dfs_search_base_offsets, dfs_skip_vbases, | |
3772 | base_offsets) != NULL_TREE; | |
3773 | } | |
3774 | ||
5c24fba6 MM |
3775 | /* DECL is a FIELD_DECL corresponding either to a base subobject of a |
3776 | non-static data member of the type indicated by RLI. BINFO is the | |
3777 | binfo corresponding to the base subobject, or, if this is a | |
3778 | non-static data-member, a dummy BINFO for the type of the data | |
01955e96 MM |
3779 | member. BINFO may be NULL if checks to see if the field overlaps |
3780 | an existing field with the same type are not required. V maps | |
3781 | offsets to types already located at those offsets. This function | |
3782 | determines the position of the DECL. */ | |
5c24fba6 MM |
3783 | |
3784 | static void | |
3785 | layout_nonempty_base_or_field (rli, decl, binfo, v) | |
3786 | record_layout_info rli; | |
3787 | tree decl; | |
3788 | tree binfo; | |
3789 | varray_type v; | |
3790 | { | |
3791 | /* Try to place the field. It may take more than one try if we have | |
3792 | a hard time placing the field without putting two objects of the | |
3793 | same type at the same address. */ | |
3794 | while (1) | |
3795 | { | |
3796 | tree offset; | |
defd0dea | 3797 | struct record_layout_info_s old_rli = *rli; |
5c24fba6 | 3798 | |
770ae6cc RK |
3799 | /* Place this field. */ |
3800 | place_field (rli, decl); | |
5c24fba6 MM |
3801 | |
3802 | /* Now that we know where it wil be placed, update its | |
3803 | BINFO_OFFSET. */ | |
da3d4dfa | 3804 | offset = byte_position (decl); |
911a71a7 | 3805 | if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo))) |
da3d4dfa MM |
3806 | propagate_binfo_offsets (binfo, |
3807 | convert (ssizetype, offset)); | |
5c24fba6 MM |
3808 | |
3809 | /* We have to check to see whether or not there is already | |
3810 | something of the same type at the offset we're about to use. | |
3811 | For example: | |
3812 | ||
3813 | struct S {}; | |
3814 | struct T : public S { int i; }; | |
3815 | struct U : public S, public T {}; | |
3816 | ||
3817 | Here, we put S at offset zero in U. Then, we can't put T at | |
3818 | offset zero -- its S component would be at the same address | |
3819 | as the S we already allocated. So, we have to skip ahead. | |
3820 | Since all data members, including those whose type is an | |
3821 | empty class, have non-zero size, any overlap can happen only | |
3822 | with a direct or indirect base-class -- it can't happen with | |
3823 | a data member. */ | |
9785e4b1 | 3824 | if (binfo && flag_new_abi && layout_conflict_p (binfo, v)) |
5c24fba6 | 3825 | { |
a55583e9 | 3826 | /* Undo the propagate_binfo_offsets call. */ |
770ae6cc | 3827 | offset = size_diffop (size_zero_node, offset); |
da3d4dfa | 3828 | propagate_binfo_offsets (binfo, convert (ssizetype, offset)); |
770ae6cc | 3829 | |
5c24fba6 MM |
3830 | /* Strip off the size allocated to this field. That puts us |
3831 | at the first place we could have put the field with | |
3832 | proper alignment. */ | |
770ae6cc RK |
3833 | *rli = old_rli; |
3834 | ||
3835 | /* Bump up by the alignment required for the type, without | |
5c24fba6 | 3836 | virtual base classes. */ |
770ae6cc RK |
3837 | rli->bitpos |
3838 | = size_binop (PLUS_EXPR, rli->bitpos, | |
3839 | bitsize_int (CLASSTYPE_ALIGN (BINFO_TYPE (binfo)))); | |
3840 | normalize_rli (rli); | |
5c24fba6 MM |
3841 | } |
3842 | else | |
3843 | /* There was no conflict. We're done laying out this field. */ | |
3844 | break; | |
3845 | } | |
3846 | } | |
3847 | ||
9785e4b1 | 3848 | /* Layout the empty base BINFO. EOC indicates the byte currently just |
ec386958 MM |
3849 | past the end of the class, and should be correctly aligned for a |
3850 | class of the type indicated by BINFO; BINFO_OFFSETS gives the | |
3851 | offsets of the other bases allocated so far. */ | |
9785e4b1 MM |
3852 | |
3853 | static void | |
3854 | layout_empty_base (binfo, eoc, binfo_offsets) | |
3855 | tree binfo; | |
3856 | tree eoc; | |
3857 | varray_type binfo_offsets; | |
3858 | { | |
ec386958 | 3859 | tree alignment; |
9785e4b1 MM |
3860 | tree basetype = BINFO_TYPE (binfo); |
3861 | ||
3862 | /* This routine should only be used for empty classes. */ | |
3863 | my_friendly_assert (is_empty_class (basetype), 20000321); | |
1b50716d | 3864 | alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype)); |
9785e4b1 MM |
3865 | |
3866 | /* This is an empty base class. We first try to put it at offset | |
3867 | zero. */ | |
3868 | if (layout_conflict_p (binfo, binfo_offsets)) | |
3869 | { | |
3870 | /* That didn't work. Now, we move forward from the next | |
3871 | available spot in the class. */ | |
770ae6cc | 3872 | propagate_binfo_offsets (binfo, convert (ssizetype, eoc)); |
9785e4b1 MM |
3873 | while (1) |
3874 | { | |
3875 | if (!layout_conflict_p (binfo, binfo_offsets)) | |
3876 | /* We finally found a spot where there's no overlap. */ | |
3877 | break; | |
3878 | ||
3879 | /* There's overlap here, too. Bump along to the next spot. */ | |
ec386958 | 3880 | propagate_binfo_offsets (binfo, alignment); |
9785e4b1 MM |
3881 | } |
3882 | } | |
3883 | } | |
3884 | ||
5c24fba6 | 3885 | /* Build a FIELD_DECL for the base given by BINFO in the class |
c966901c | 3886 | indicated by RLI. If the new object is non-empty, clear *EMPTY_P. |
5c24fba6 | 3887 | *BASE_ALIGN is a running maximum of the alignments of any base |
c966901c | 3888 | class. */ |
5c24fba6 MM |
3889 | |
3890 | static void | |
3891 | build_base_field (rli, binfo, empty_p, base_align, v) | |
3892 | record_layout_info rli; | |
d77249e7 MM |
3893 | tree binfo; |
3894 | int *empty_p; | |
d77249e7 | 3895 | unsigned int *base_align; |
5c24fba6 | 3896 | varray_type *v; |
d77249e7 MM |
3897 | { |
3898 | tree basetype = BINFO_TYPE (binfo); | |
3899 | tree decl; | |
3900 | ||
d0f062fb | 3901 | if (!COMPLETE_TYPE_P (basetype)) |
d77249e7 MM |
3902 | /* This error is now reported in xref_tag, thus giving better |
3903 | location information. */ | |
5c24fba6 | 3904 | return; |
d77249e7 | 3905 | |
721c3b42 | 3906 | decl = build_decl (FIELD_DECL, NULL_TREE, basetype); |
d77249e7 | 3907 | DECL_ARTIFICIAL (decl) = 1; |
5c24fba6 | 3908 | DECL_FIELD_CONTEXT (decl) = rli->t; |
d77249e7 | 3909 | DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype); |
06ceef4e | 3910 | DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype); |
d77249e7 | 3911 | DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype); |
11cf4d18 | 3912 | DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype); |
d77249e7 | 3913 | |
d77249e7 MM |
3914 | if (! flag_new_abi) |
3915 | { | |
3916 | /* Brain damage for backwards compatibility. For no good | |
9785e4b1 | 3917 | reason, the old basetype layout made every base have at least |
d77249e7 | 3918 | as large as the alignment for the bases up to that point, |
9785e4b1 | 3919 | gratuitously wasting space. So we do the same thing here. */ |
d77249e7 MM |
3920 | *base_align = MAX (*base_align, DECL_ALIGN (decl)); |
3921 | DECL_SIZE (decl) | |
665f2503 | 3922 | = size_binop (MAX_EXPR, DECL_SIZE (decl), bitsize_int (*base_align)); |
06ceef4e | 3923 | DECL_SIZE_UNIT (decl) |
665f2503 RK |
3924 | = size_binop (MAX_EXPR, DECL_SIZE_UNIT (decl), |
3925 | size_int (*base_align / BITS_PER_UNIT)); | |
d77249e7 MM |
3926 | } |
3927 | ||
5c24fba6 MM |
3928 | if (!integer_zerop (DECL_SIZE (decl))) |
3929 | { | |
3930 | /* The containing class is non-empty because it has a non-empty | |
3931 | base class. */ | |
3932 | *empty_p = 0; | |
3933 | ||
3934 | /* Try to place the field. It may take more than one try if we | |
3935 | have a hard time placing the field without putting two | |
3936 | objects of the same type at the same address. */ | |
3937 | layout_nonempty_base_or_field (rli, decl, binfo, *v); | |
3938 | } | |
3939 | else | |
ec386958 MM |
3940 | { |
3941 | unsigned HOST_WIDE_INT eoc; | |
3942 | ||
3943 | /* On some platforms (ARM), even empty classes will not be | |
3944 | byte-aligned. */ | |
3945 | eoc = tree_low_cst (rli_size_unit_so_far (rli), 0); | |
3946 | eoc = CEIL (eoc, DECL_ALIGN (decl)) * DECL_ALIGN (decl); | |
3947 | layout_empty_base (binfo, size_int (eoc), *v); | |
3948 | } | |
5c24fba6 MM |
3949 | |
3950 | /* Check for inaccessible base classes. If the same base class | |
3951 | appears more than once in the hierarchy, but isn't virtual, then | |
3952 | it's ambiguous. */ | |
3953 | if (get_base_distance (basetype, rli->t, 0, NULL) == -2) | |
3954 | cp_warning ("direct base `%T' inaccessible in `%T' due to ambiguity", | |
3955 | basetype, rli->t); | |
3956 | ||
3957 | /* Record the offsets of BINFO and its base subobjects. */ | |
9785e4b1 | 3958 | record_base_offsets (binfo, v); |
d77249e7 MM |
3959 | } |
3960 | ||
5c24fba6 MM |
3961 | /* Layout all of the non-virtual base classes. Returns a map from |
3962 | offsets to types present at those offsets. */ | |
607cf131 | 3963 | |
5c24fba6 MM |
3964 | static varray_type |
3965 | build_base_fields (rli, empty_p) | |
3966 | record_layout_info rli; | |
607cf131 MM |
3967 | int *empty_p; |
3968 | { | |
3969 | /* Chain to hold all the new FIELD_DECLs which stand in for base class | |
3970 | subobjects. */ | |
5c24fba6 | 3971 | tree rec = rli->t; |
607cf131 | 3972 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec); |
5c24fba6 MM |
3973 | int i; |
3974 | varray_type v; | |
607cf131 MM |
3975 | unsigned int base_align = 0; |
3976 | ||
5c24fba6 MM |
3977 | /* Create the table mapping offsets to empty base classes. */ |
3978 | VARRAY_TREE_INIT (v, 32, "v"); | |
3979 | ||
d77249e7 MM |
3980 | /* Under the new ABI, the primary base class is always allocated |
3981 | first. */ | |
3982 | if (flag_new_abi && CLASSTYPE_HAS_PRIMARY_BASE_P (rec)) | |
5c24fba6 MM |
3983 | build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (rec), |
3984 | empty_p, &base_align, &v); | |
d77249e7 MM |
3985 | |
3986 | /* Now allocate the rest of the bases. */ | |
607cf131 MM |
3987 | for (i = 0; i < n_baseclasses; ++i) |
3988 | { | |
d77249e7 | 3989 | tree base_binfo; |
607cf131 | 3990 | |
911a71a7 MM |
3991 | base_binfo = BINFO_BASETYPE (TYPE_BINFO (rec), i); |
3992 | ||
d77249e7 MM |
3993 | /* Under the new ABI, the primary base was already allocated |
3994 | above, so we don't need to allocate it again here. */ | |
911a71a7 | 3995 | if (flag_new_abi && base_binfo == CLASSTYPE_PRIMARY_BINFO (rec)) |
607cf131 MM |
3996 | continue; |
3997 | ||
8026246f MM |
3998 | /* A primary virtual base class is allocated just like any other |
3999 | base class, but a non-primary virtual base is allocated | |
9785e4b1 | 4000 | later, in layout_virtual_bases. */ |
8026246f | 4001 | if (TREE_VIA_VIRTUAL (base_binfo) |
d77249e7 | 4002 | && !BINFO_PRIMARY_MARKED_P (base_binfo)) |
607cf131 MM |
4003 | continue; |
4004 | ||
5c24fba6 | 4005 | build_base_field (rli, base_binfo, empty_p, &base_align, &v); |
607cf131 MM |
4006 | } |
4007 | ||
5c24fba6 | 4008 | return v; |
607cf131 MM |
4009 | } |
4010 | ||
58010b57 MM |
4011 | /* Go through the TYPE_METHODS of T issuing any appropriate |
4012 | diagnostics, figuring out which methods override which other | |
3ef397c1 | 4013 | methods, and so forth. */ |
58010b57 MM |
4014 | |
4015 | static void | |
4016 | check_methods (t) | |
4017 | tree t; | |
4018 | { | |
4019 | tree x; | |
834c6dff | 4020 | int seen_one_arg_array_delete_p = 0; |
58010b57 MM |
4021 | |
4022 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) | |
4023 | { | |
4024 | GNU_xref_member (current_class_name, x); | |
4025 | ||
4026 | /* If this was an evil function, don't keep it in class. */ | |
4027 | if (IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (x))) | |
4028 | continue; | |
4029 | ||
58010b57 | 4030 | check_for_override (x, t); |
fee7654e | 4031 | if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x)) |
58010b57 MM |
4032 | cp_error_at ("initializer specified for non-virtual method `%D'", x); |
4033 | ||
4034 | /* The name of the field is the original field name | |
4035 | Save this in auxiliary field for later overloading. */ | |
4036 | if (DECL_VINDEX (x)) | |
4037 | { | |
3ef397c1 | 4038 | TYPE_POLYMORPHIC_P (t) = 1; |
fee7654e MM |
4039 | if (DECL_PURE_VIRTUAL_P (x)) |
4040 | CLASSTYPE_PURE_VIRTUALS (t) | |
4041 | = tree_cons (NULL_TREE, x, CLASSTYPE_PURE_VIRTUALS (t)); | |
58010b57 | 4042 | } |
834c6dff MM |
4043 | |
4044 | if (DECL_ARRAY_DELETE_OPERATOR_P (x)) | |
4045 | { | |
4046 | tree second_parm; | |
4047 | ||
4048 | /* When dynamically allocating an array of this type, we | |
4049 | need a "cookie" to record how many elements we allocated, | |
4050 | even if the array elements have no non-trivial | |
4051 | destructor, if the usual array deallocation function | |
4052 | takes a second argument of type size_t. The standard (in | |
4053 | [class.free]) requires that the second argument be set | |
4054 | correctly. */ | |
4055 | second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (x))); | |
4056 | /* This is overly conservative, but we must maintain this | |
4057 | behavior for backwards compatibility. */ | |
4058 | if (!flag_new_abi && second_parm != void_list_node) | |
4059 | TYPE_VEC_DELETE_TAKES_SIZE (t) = 1; | |
4060 | /* Under the new ABI, we choose only those function that are | |
4061 | explicitly declared as `operator delete[] (void *, | |
4062 | size_t)'. */ | |
4063 | else if (flag_new_abi | |
4064 | && !seen_one_arg_array_delete_p | |
4065 | && second_parm | |
4066 | && TREE_CHAIN (second_parm) == void_list_node | |
4067 | && same_type_p (TREE_VALUE (second_parm), sizetype)) | |
4068 | TYPE_VEC_DELETE_TAKES_SIZE (t) = 1; | |
4069 | /* If there's no second parameter, then this is the usual | |
4070 | deallocation function. */ | |
4071 | else if (second_parm == void_list_node) | |
4072 | seen_one_arg_array_delete_p = 1; | |
4073 | } | |
58010b57 | 4074 | } |
58010b57 MM |
4075 | } |
4076 | ||
db9b2174 MM |
4077 | /* FN is a constructor or destructor. Clone the declaration to create |
4078 | a specialized in-charge or not-in-charge version, as indicated by | |
4079 | NAME. */ | |
4080 | ||
4081 | static tree | |
4082 | build_clone (fn, name) | |
4083 | tree fn; | |
4084 | tree name; | |
4085 | { | |
4086 | tree parms; | |
4087 | tree clone; | |
4088 | ||
4089 | /* Copy the function. */ | |
4090 | clone = copy_decl (fn); | |
4091 | /* Remember where this function came from. */ | |
4092 | DECL_CLONED_FUNCTION (clone) = fn; | |
4093 | /* Reset the function name. */ | |
4094 | DECL_NAME (clone) = name; | |
4095 | DECL_ASSEMBLER_NAME (clone) = DECL_NAME (clone); | |
4096 | /* There's no pending inline data for this function. */ | |
4097 | DECL_PENDING_INLINE_INFO (clone) = NULL; | |
4098 | DECL_PENDING_INLINE_P (clone) = 0; | |
4099 | /* And it hasn't yet been deferred. */ | |
4100 | DECL_DEFERRED_FN (clone) = 0; | |
3ec6bad3 MM |
4101 | /* There's no magic VTT parameter in the clone. */ |
4102 | DECL_VTT_PARM (clone) = NULL_TREE; | |
db9b2174 | 4103 | |
298d6f60 MM |
4104 | /* The base-class destructor is not virtual. */ |
4105 | if (name == base_dtor_identifier) | |
4106 | { | |
4107 | DECL_VIRTUAL_P (clone) = 0; | |
4108 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
4109 | DECL_VINDEX (clone) = NULL_TREE; | |
4110 | } | |
4111 | ||
4e7512c9 | 4112 | /* If there was an in-charge parameter, drop it from the function |
db9b2174 MM |
4113 | type. */ |
4114 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
4115 | { | |
4116 | tree basetype; | |
4117 | tree parmtypes; | |
4118 | tree exceptions; | |
4119 | ||
4120 | exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); | |
4121 | basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
4122 | parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
4123 | /* Skip the `this' parameter. */ | |
4124 | parmtypes = TREE_CHAIN (parmtypes); | |
4125 | /* Skip the in-charge parameter. */ | |
4126 | parmtypes = TREE_CHAIN (parmtypes); | |
3ec6bad3 MM |
4127 | /* If this is subobject constructor or destructor, add the vtt |
4128 | parameter. */ | |
4129 | if (DECL_NEEDS_VTT_PARM_P (clone)) | |
4130 | parmtypes = hash_tree_chain (vtt_parm_type, parmtypes); | |
db9b2174 MM |
4131 | TREE_TYPE (clone) |
4132 | = build_cplus_method_type (basetype, | |
4133 | TREE_TYPE (TREE_TYPE (clone)), | |
4134 | parmtypes); | |
4135 | if (exceptions) | |
4136 | TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), | |
4137 | exceptions); | |
4138 | } | |
4139 | ||
4140 | /* Copy the function parameters. But, DECL_ARGUMENTS aren't | |
4141 | function parameters; instead, those are the template parameters. */ | |
4142 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
4143 | { | |
4144 | DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone)); | |
4145 | /* Remove the in-charge parameter. */ | |
4146 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
4147 | { | |
4148 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
4149 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
4150 | DECL_HAS_IN_CHARGE_PARM_P (clone) = 0; | |
4151 | } | |
3ec6bad3 MM |
4152 | |
4153 | /* Add the VTT parameter. */ | |
4154 | if (DECL_NEEDS_VTT_PARM_P (clone)) | |
4155 | { | |
4156 | tree parm; | |
4157 | ||
4158 | parm = build_artificial_parm (vtt_parm_identifier, | |
4159 | vtt_parm_type); | |
4160 | TREE_CHAIN (parm) = TREE_CHAIN (DECL_ARGUMENTS (clone)); | |
4161 | TREE_CHAIN (DECL_ARGUMENTS (clone)) = parm; | |
4162 | } | |
4163 | ||
db9b2174 MM |
4164 | for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms)) |
4165 | { | |
4166 | DECL_CONTEXT (parms) = clone; | |
4167 | copy_lang_decl (parms); | |
4168 | } | |
4169 | } | |
4170 | ||
4171 | /* Mangle the function name. */ | |
4172 | set_mangled_name_for_decl (clone); | |
4173 | ||
4174 | /* Create the RTL for this function. */ | |
4175 | DECL_RTL (clone) = NULL_RTX; | |
4176 | rest_of_decl_compilation (clone, NULL, /*top_level=*/1, at_eof); | |
4177 | ||
4178 | /* Make it easy to find the CLONE given the FN. */ | |
4179 | TREE_CHAIN (clone) = TREE_CHAIN (fn); | |
4180 | TREE_CHAIN (fn) = clone; | |
4181 | ||
4182 | /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */ | |
4183 | if (TREE_CODE (clone) == TEMPLATE_DECL) | |
4184 | { | |
4185 | tree result; | |
4186 | ||
4187 | DECL_TEMPLATE_RESULT (clone) | |
4188 | = build_clone (DECL_TEMPLATE_RESULT (clone), name); | |
4189 | result = DECL_TEMPLATE_RESULT (clone); | |
4190 | DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result)); | |
4191 | DECL_TI_TEMPLATE (result) = clone; | |
4192 | } | |
298d6f60 MM |
4193 | else if (DECL_DEFERRED_FN (fn)) |
4194 | defer_fn (clone); | |
db9b2174 MM |
4195 | |
4196 | return clone; | |
4197 | } | |
4198 | ||
4199 | /* Produce declarations for all appropriate clones of FN. If | |
4200 | UPDATE_METHOD_VEC_P is non-zero, the clones are added to the | |
4201 | CLASTYPE_METHOD_VEC as well. */ | |
4202 | ||
4203 | void | |
4204 | clone_function_decl (fn, update_method_vec_p) | |
4205 | tree fn; | |
4206 | int update_method_vec_p; | |
4207 | { | |
4208 | tree clone; | |
4209 | ||
298d6f60 | 4210 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)) |
db9b2174 | 4211 | { |
298d6f60 MM |
4212 | /* For each constructor, we need two variants: an in-charge version |
4213 | and a not-in-charge version. */ | |
db9b2174 MM |
4214 | clone = build_clone (fn, complete_ctor_identifier); |
4215 | if (update_method_vec_p) | |
452a394b | 4216 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
4217 | clone = build_clone (fn, base_ctor_identifier); |
4218 | if (update_method_vec_p) | |
452a394b | 4219 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
4220 | } |
4221 | else | |
298d6f60 MM |
4222 | { |
4223 | my_friendly_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn), 20000411); | |
4224 | ||
3ec6bad3 | 4225 | /* For each destructor, we need three variants: an in-charge |
298d6f60 | 4226 | version, a not-in-charge version, and an in-charge deleting |
4e7512c9 MM |
4227 | version. We clone the deleting version first because that |
4228 | means it will go second on the TYPE_METHODS list -- and that | |
4229 | corresponds to the correct layout order in the virtual | |
4230 | function table. */ | |
4231 | clone = build_clone (fn, deleting_dtor_identifier); | |
298d6f60 | 4232 | if (update_method_vec_p) |
452a394b | 4233 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
4e7512c9 | 4234 | clone = build_clone (fn, complete_dtor_identifier); |
298d6f60 | 4235 | if (update_method_vec_p) |
452a394b | 4236 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 MM |
4237 | clone = build_clone (fn, base_dtor_identifier); |
4238 | if (update_method_vec_p) | |
452a394b | 4239 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 | 4240 | } |
db9b2174 MM |
4241 | } |
4242 | ||
4243 | /* For each of the constructors and destructors in T, create an | |
4244 | in-charge and not-in-charge variant. */ | |
4245 | ||
4246 | static void | |
4247 | clone_constructors_and_destructors (t) | |
4248 | tree t; | |
4249 | { | |
4250 | tree fns; | |
4251 | ||
4252 | /* We only clone constructors and destructors under the new ABI. */ | |
4253 | if (!flag_new_abi) | |
4254 | return; | |
4255 | ||
4256 | /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail | |
4257 | out now. */ | |
4258 | if (!CLASSTYPE_METHOD_VEC (t)) | |
4259 | return; | |
4260 | ||
db9b2174 MM |
4261 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4262 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
298d6f60 MM |
4263 | for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4264 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
db9b2174 MM |
4265 | } |
4266 | ||
58010b57 MM |
4267 | /* Remove all zero-width bit-fields from T. */ |
4268 | ||
4269 | static void | |
4270 | remove_zero_width_bit_fields (t) | |
4271 | tree t; | |
4272 | { | |
4273 | tree *fieldsp; | |
4274 | ||
4275 | fieldsp = &TYPE_FIELDS (t); | |
4276 | while (*fieldsp) | |
4277 | { | |
4278 | if (TREE_CODE (*fieldsp) == FIELD_DECL | |
4279 | && DECL_C_BIT_FIELD (*fieldsp) | |
4280 | && DECL_INITIAL (*fieldsp)) | |
4281 | *fieldsp = TREE_CHAIN (*fieldsp); | |
4282 | else | |
4283 | fieldsp = &TREE_CHAIN (*fieldsp); | |
4284 | } | |
4285 | } | |
4286 | ||
607cf131 MM |
4287 | /* Check the validity of the bases and members declared in T. Add any |
4288 | implicitly-generated functions (like copy-constructors and | |
4289 | assignment operators). Compute various flag bits (like | |
4290 | CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++ | |
4291 | level: i.e., independently of the ABI in use. */ | |
4292 | ||
4293 | static void | |
4294 | check_bases_and_members (t, empty_p) | |
4295 | tree t; | |
4296 | int *empty_p; | |
4297 | { | |
4298 | /* Nonzero if we are not allowed to generate a default constructor | |
4299 | for this case. */ | |
4300 | int cant_have_default_ctor; | |
4301 | /* Nonzero if the implicitly generated copy constructor should take | |
4302 | a non-const reference argument. */ | |
4303 | int cant_have_const_ctor; | |
4304 | /* Nonzero if the the implicitly generated assignment operator | |
4305 | should take a non-const reference argument. */ | |
4306 | int no_const_asn_ref; | |
4307 | tree access_decls; | |
4308 | ||
4309 | /* By default, we use const reference arguments and generate default | |
4310 | constructors. */ | |
4311 | cant_have_default_ctor = 0; | |
4312 | cant_have_const_ctor = 0; | |
4313 | no_const_asn_ref = 0; | |
4314 | ||
f9c528ea MM |
4315 | /* Assume that the class is nearly empty; we'll clear this flag if |
4316 | it turns out not to be nearly empty. */ | |
4317 | CLASSTYPE_NEARLY_EMPTY_P (t) = 1; | |
4318 | ||
607cf131 MM |
4319 | /* Check all the base-classes. */ |
4320 | check_bases (t, &cant_have_default_ctor, &cant_have_const_ctor, | |
4321 | &no_const_asn_ref); | |
4322 | ||
4323 | /* Check all the data member declarations. */ | |
4324 | check_field_decls (t, &access_decls, empty_p, | |
4325 | &cant_have_default_ctor, | |
4326 | &cant_have_const_ctor, | |
4327 | &no_const_asn_ref); | |
4328 | ||
4329 | /* Check all the method declarations. */ | |
4330 | check_methods (t); | |
4331 | ||
bbd15aac MM |
4332 | /* A nearly-empty class has to be vptr-containing; a nearly empty |
4333 | class contains just a vptr. */ | |
4334 | if (!TYPE_CONTAINS_VPTR_P (t)) | |
f9c528ea MM |
4335 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; |
4336 | ||
607cf131 MM |
4337 | /* Do some bookkeeping that will guide the generation of implicitly |
4338 | declared member functions. */ | |
4339 | TYPE_HAS_COMPLEX_INIT_REF (t) | |
3ef397c1 MM |
4340 | |= (TYPE_HAS_INIT_REF (t) |
4341 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4342 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 | 4343 | TYPE_NEEDS_CONSTRUCTING (t) |
3ef397c1 MM |
4344 | |= (TYPE_HAS_CONSTRUCTOR (t) |
4345 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4346 | || TYPE_POLYMORPHIC_P (t)); | |
4347 | CLASSTYPE_NON_AGGREGATE (t) |= (TYPE_HAS_CONSTRUCTOR (t) | |
4348 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 MM |
4349 | CLASSTYPE_NON_POD_P (t) |
4350 | |= (CLASSTYPE_NON_AGGREGATE (t) || TYPE_HAS_DESTRUCTOR (t) | |
4351 | || TYPE_HAS_ASSIGN_REF (t)); | |
4352 | TYPE_HAS_REAL_ASSIGN_REF (t) |= TYPE_HAS_ASSIGN_REF (t); | |
4353 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) | |
4354 | |= TYPE_HAS_ASSIGN_REF (t) || TYPE_USES_VIRTUAL_BASECLASSES (t); | |
4355 | ||
4356 | /* Synthesize any needed methods. Note that methods will be synthesized | |
4357 | for anonymous unions; grok_x_components undoes that. */ | |
4358 | add_implicitly_declared_members (t, cant_have_default_ctor, | |
4359 | cant_have_const_ctor, | |
4360 | no_const_asn_ref); | |
4361 | ||
db9b2174 MM |
4362 | /* Create the in-charge and not-in-charge variants of constructors |
4363 | and destructors. */ | |
4364 | clone_constructors_and_destructors (t); | |
4365 | ||
aa52c1ff JM |
4366 | /* Process the using-declarations. */ |
4367 | for (; access_decls; access_decls = TREE_CHAIN (access_decls)) | |
4368 | handle_using_decl (TREE_VALUE (access_decls), t); | |
4369 | ||
607cf131 MM |
4370 | /* Build and sort the CLASSTYPE_METHOD_VEC. */ |
4371 | finish_struct_methods (t); | |
607cf131 MM |
4372 | } |
4373 | ||
3ef397c1 | 4374 | /* If T needs a pointer to its virtual function table, set TYPE_VFIELD |
5c24fba6 MM |
4375 | accordingly. If a new vfield was created (because T doesn't have a |
4376 | primary base class), then the newly created field is returned. It | |
c35cce41 | 4377 | is not added to the TYPE_FIELDS list; it is the caller's |
5c24fba6 | 4378 | responsibility to do that. */ |
3ef397c1 | 4379 | |
5c24fba6 | 4380 | static tree |
da3d4dfa | 4381 | create_vtable_ptr (t, empty_p, vfuns_p, |
051e6fd7 | 4382 | new_virtuals_p, overridden_virtuals_p) |
3ef397c1 MM |
4383 | tree t; |
4384 | int *empty_p; | |
da3d4dfa | 4385 | int *vfuns_p; |
051e6fd7 MM |
4386 | tree *new_virtuals_p; |
4387 | tree *overridden_virtuals_p; | |
3ef397c1 MM |
4388 | { |
4389 | tree fn; | |
4390 | ||
3ef397c1 MM |
4391 | /* Loop over the virtual functions, adding them to our various |
4392 | vtables. */ | |
4393 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
298d6f60 MM |
4394 | if (DECL_VINDEX (fn) |
4395 | && !(flag_new_abi && DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn))) | |
051e6fd7 | 4396 | add_virtual_function (new_virtuals_p, overridden_virtuals_p, |
da3d4dfa | 4397 | vfuns_p, fn, t); |
3ef397c1 | 4398 | |
da3d4dfa MM |
4399 | /* If we couldn't find an appropriate base class, create a new field |
4400 | here. Even if there weren't any new virtual functions, we might need a | |
bbd15aac MM |
4401 | new virtual function table if we're supposed to include vptrs in |
4402 | all classes that need them. */ | |
da3d4dfa MM |
4403 | if (!TYPE_VFIELD (t) |
4404 | && (*vfuns_p | |
4405 | || (TYPE_CONTAINS_VPTR_P (t) && vptrs_present_everywhere_p ()))) | |
3ef397c1 MM |
4406 | { |
4407 | /* We build this decl with vtbl_ptr_type_node, which is a | |
4408 | `vtable_entry_type*'. It might seem more precise to use | |
4409 | `vtable_entry_type (*)[N]' where N is the number of firtual | |
4410 | functions. However, that would require the vtable pointer in | |
4411 | base classes to have a different type than the vtable pointer | |
4412 | in derived classes. We could make that happen, but that | |
4413 | still wouldn't solve all the problems. In particular, the | |
4414 | type-based alias analysis code would decide that assignments | |
4415 | to the base class vtable pointer can't alias assignments to | |
4416 | the derived class vtable pointer, since they have different | |
4417 | types. Thus, in an derived class destructor, where the base | |
4418 | class constructor was inlined, we could generate bad code for | |
4419 | setting up the vtable pointer. | |
4420 | ||
4421 | Therefore, we use one type for all vtable pointers. We still | |
4422 | use a type-correct type; it's just doesn't indicate the array | |
4423 | bounds. That's better than using `void*' or some such; it's | |
4424 | cleaner, and it let's the alias analysis code know that these | |
4425 | stores cannot alias stores to void*! */ | |
4426 | TYPE_VFIELD (t) | |
4427 | = build_vtbl_or_vbase_field (get_vfield_name (t), | |
4428 | get_identifier (VFIELD_BASE), | |
4429 | vtbl_ptr_type_node, | |
4430 | t, | |
07a3462a | 4431 | t, |
3ef397c1 MM |
4432 | empty_p); |
4433 | ||
5c24fba6 MM |
4434 | if (flag_new_abi && CLASSTYPE_N_BASECLASSES (t)) |
4435 | /* If there were any baseclasses, they can't possibly be at | |
4436 | offset zero any more, because that's where the vtable | |
4437 | pointer is. So, converting to a base class is going to | |
4438 | take work. */ | |
4439 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t) = 1; | |
3ef397c1 | 4440 | |
5c24fba6 | 4441 | return TYPE_VFIELD (t); |
3ef397c1 | 4442 | } |
5c24fba6 MM |
4443 | |
4444 | return NULL_TREE; | |
3ef397c1 MM |
4445 | } |
4446 | ||
2ef16140 MM |
4447 | /* Fixup the inline function given by INFO now that the class is |
4448 | complete. */ | |
08b962b0 | 4449 | |
2ef16140 MM |
4450 | static void |
4451 | fixup_pending_inline (info) | |
4452 | struct pending_inline *info; | |
4453 | { | |
4454 | if (info) | |
4455 | { | |
4456 | tree args; | |
4457 | tree fn = info->fndecl; | |
08b962b0 | 4458 | |
2ef16140 MM |
4459 | args = DECL_ARGUMENTS (fn); |
4460 | while (args) | |
4461 | { | |
4462 | DECL_CONTEXT (args) = fn; | |
4463 | args = TREE_CHAIN (args); | |
4464 | } | |
4465 | } | |
4466 | } | |
08b962b0 | 4467 | |
2ef16140 MM |
4468 | /* Fixup the inline methods and friends in TYPE now that TYPE is |
4469 | complete. */ | |
08b962b0 | 4470 | |
2ef16140 MM |
4471 | static void |
4472 | fixup_inline_methods (type) | |
4473 | tree type; | |
08b962b0 | 4474 | { |
2ef16140 | 4475 | tree method = TYPE_METHODS (type); |
08b962b0 | 4476 | |
2ef16140 | 4477 | if (method && TREE_CODE (method) == TREE_VEC) |
08b962b0 | 4478 | { |
2ef16140 MM |
4479 | if (TREE_VEC_ELT (method, 1)) |
4480 | method = TREE_VEC_ELT (method, 1); | |
4481 | else if (TREE_VEC_ELT (method, 0)) | |
4482 | method = TREE_VEC_ELT (method, 0); | |
08b962b0 | 4483 | else |
2ef16140 | 4484 | method = TREE_VEC_ELT (method, 2); |
08b962b0 MM |
4485 | } |
4486 | ||
2ef16140 MM |
4487 | /* Do inline member functions. */ |
4488 | for (; method; method = TREE_CHAIN (method)) | |
4489 | fixup_pending_inline (DECL_PENDING_INLINE_INFO (method)); | |
08b962b0 | 4490 | |
2ef16140 MM |
4491 | /* Do friends. */ |
4492 | for (method = CLASSTYPE_INLINE_FRIENDS (type); | |
4493 | method; | |
4494 | method = TREE_CHAIN (method)) | |
4495 | fixup_pending_inline (DECL_PENDING_INLINE_INFO (TREE_VALUE (method))); | |
351c54c8 | 4496 | CLASSTYPE_INLINE_FRIENDS (type) = NULL_TREE; |
2ef16140 | 4497 | } |
08b962b0 | 4498 | |
9d4c0187 MM |
4499 | /* Add OFFSET to all base types of BINFO which is a base in the |
4500 | hierarchy dominated by T. | |
80fd5f48 | 4501 | |
911a71a7 | 4502 | OFFSET, which is a type offset, is number of bytes. */ |
80fd5f48 MM |
4503 | |
4504 | static void | |
4505 | propagate_binfo_offsets (binfo, offset) | |
4506 | tree binfo; | |
4507 | tree offset; | |
4508 | { | |
911a71a7 MM |
4509 | int i; |
4510 | tree primary_binfo; | |
80fd5f48 | 4511 | |
911a71a7 MM |
4512 | /* Update BINFO's offset. */ |
4513 | BINFO_OFFSET (binfo) | |
4514 | = convert (sizetype, | |
4515 | size_binop (PLUS_EXPR, | |
4516 | convert (ssizetype, BINFO_OFFSET (binfo)), | |
4517 | offset)); | |
80fd5f48 | 4518 | |
911a71a7 MM |
4519 | /* Find the primary base class. */ |
4520 | primary_binfo = get_primary_binfo (binfo); | |
4521 | ||
4522 | /* Scan all of the bases, pushing the BINFO_OFFSET adjust | |
4523 | downwards. */ | |
4524 | for (i = -1; i < BINFO_N_BASETYPES (binfo); ++i) | |
80fd5f48 | 4525 | { |
911a71a7 | 4526 | tree base_binfo; |
80fd5f48 | 4527 | |
911a71a7 MM |
4528 | /* On the first through the loop, do the primary base. Because |
4529 | the primary base need not be an immediate base, we must | |
4530 | handle the primary base specially. */ | |
4531 | if (i == -1) | |
4532 | { | |
4533 | if (!primary_binfo) | |
4534 | continue; | |
80fd5f48 | 4535 | |
911a71a7 MM |
4536 | base_binfo = primary_binfo; |
4537 | } | |
4538 | else | |
4539 | { | |
4540 | base_binfo = BINFO_BASETYPE (binfo, i); | |
4541 | /* Don't do the primary base twice. */ | |
4542 | if (base_binfo == primary_binfo) | |
4543 | continue; | |
4544 | } | |
4545 | ||
4546 | /* Skip virtual bases that aren't our primary base. */ | |
4547 | if (TREE_VIA_VIRTUAL (base_binfo) | |
4548 | && BINFO_PRIMARY_BASE_OF (base_binfo) != binfo) | |
4549 | continue; | |
4550 | ||
4551 | propagate_binfo_offsets (base_binfo, offset); | |
4552 | } | |
9d4c0187 MM |
4553 | } |
4554 | ||
4555 | /* Called via dfs_walk from layout_virtual bases. */ | |
4556 | ||
4557 | static tree | |
4558 | dfs_set_offset_for_unshared_vbases (binfo, data) | |
4559 | tree binfo; | |
4560 | void *data; | |
4561 | { | |
4562 | /* If this is a virtual base, make sure it has the same offset as | |
4563 | the shared copy. If it's a primary base, then we know it's | |
4564 | correct. */ | |
4565 | if (TREE_VIA_VIRTUAL (binfo) && !BINFO_PRIMARY_MARKED_P (binfo)) | |
4566 | { | |
4567 | tree t = (tree) data; | |
4568 | tree vbase; | |
4569 | tree offset; | |
4570 | ||
a55583e9 | 4571 | vbase = binfo_for_vbase (BINFO_TYPE (binfo), t); |
cd8ed629 | 4572 | offset = size_diffop (BINFO_OFFSET (vbase), BINFO_OFFSET (binfo)); |
9d4c0187 MM |
4573 | propagate_binfo_offsets (binfo, offset); |
4574 | } | |
80fd5f48 MM |
4575 | |
4576 | return NULL_TREE; | |
4577 | } | |
4578 | ||
4579 | /* Set BINFO_OFFSET for all of the virtual bases for T. Update | |
9785e4b1 MM |
4580 | TYPE_ALIGN and TYPE_SIZE for T. BASE_OFFSETS is a varray mapping |
4581 | offsets to the types at those offsets. */ | |
80fd5f48 | 4582 | |
d2c5305b | 4583 | static void |
9785e4b1 | 4584 | layout_virtual_bases (t, base_offsets) |
80fd5f48 | 4585 | tree t; |
9785e4b1 | 4586 | varray_type *base_offsets; |
80fd5f48 | 4587 | { |
c35cce41 | 4588 | tree vbases; |
665f2503 | 4589 | unsigned HOST_WIDE_INT dsize; |
9785e4b1 MM |
4590 | unsigned HOST_WIDE_INT eoc; |
4591 | ||
4592 | if (CLASSTYPE_N_BASECLASSES (t) == 0) | |
4593 | return; | |
4594 | ||
4595 | #ifdef STRUCTURE_SIZE_BOUNDARY | |
4596 | /* Packed structures don't need to have minimum size. */ | |
736fb497 MM |
4597 | if (! TYPE_PACKED (t)) |
4598 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), STRUCTURE_SIZE_BOUNDARY); | |
9785e4b1 | 4599 | #endif |
80fd5f48 | 4600 | |
80fd5f48 | 4601 | /* DSIZE is the size of the class without the virtual bases. */ |
665f2503 RK |
4602 | dsize = tree_low_cst (TYPE_SIZE (t), 1); |
4603 | ||
80fd5f48 MM |
4604 | /* Make every class have alignment of at least one. */ |
4605 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), BITS_PER_UNIT); | |
4606 | ||
9d4c0187 | 4607 | /* Go through the virtual bases, allocating space for each virtual |
c35cce41 MM |
4608 | base that is not already a primary base class. Under the new |
4609 | ABI, these are allocated according to a depth-first left-to-right | |
4610 | postorder traversal; in the new ABI, inheritance graph order is | |
4611 | used instead. */ | |
4612 | for (vbases = (flag_new_abi | |
4613 | ? TYPE_BINFO (t) | |
4614 | : CLASSTYPE_VBASECLASSES (t)); | |
4615 | vbases; | |
4616 | vbases = TREE_CHAIN (vbases)) | |
4617 | { | |
4618 | tree vbase; | |
4619 | ||
c35cce41 | 4620 | if (flag_new_abi) |
a55583e9 MM |
4621 | { |
4622 | if (!TREE_VIA_VIRTUAL (vbases)) | |
4623 | continue; | |
4624 | vbase = binfo_for_vbase (BINFO_TYPE (vbases), t); | |
4625 | } | |
c35cce41 | 4626 | else |
a55583e9 | 4627 | vbase = TREE_VALUE (vbases); |
c35cce41 | 4628 | |
911a71a7 | 4629 | if (!BINFO_PRIMARY_MARKED_P (vbase)) |
c35cce41 MM |
4630 | { |
4631 | /* This virtual base is not a primary base of any class in the | |
4632 | hierarchy, so we have to add space for it. */ | |
4633 | tree basetype; | |
4634 | unsigned int desired_align; | |
80fd5f48 | 4635 | |
c35cce41 | 4636 | basetype = BINFO_TYPE (vbase); |
9785e4b1 | 4637 | |
c35cce41 MM |
4638 | if (flag_new_abi) |
4639 | desired_align = CLASSTYPE_ALIGN (basetype); | |
4640 | else | |
4641 | /* Under the old ABI, virtual bases were aligned as for the | |
ec386958 MM |
4642 | entire base object (including its virtual bases). That's |
4643 | wasteful, in general. */ | |
c35cce41 MM |
4644 | desired_align = TYPE_ALIGN (basetype); |
4645 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), desired_align); | |
4646 | ||
4647 | /* Add padding so that we can put the virtual base class at an | |
4648 | appropriately aligned offset. */ | |
4649 | dsize = CEIL (dsize, desired_align) * desired_align; | |
4650 | ||
4651 | /* Under the new ABI, we try to squish empty virtual bases in | |
4652 | just like ordinary empty bases. */ | |
4653 | if (flag_new_abi && is_empty_class (basetype)) | |
4654 | layout_empty_base (vbase, | |
4655 | size_int (CEIL (dsize, BITS_PER_UNIT)), | |
4656 | *base_offsets); | |
4657 | else | |
4658 | { | |
a55583e9 MM |
4659 | tree offset; |
4660 | ||
4661 | offset = ssize_int (CEIL (dsize, BITS_PER_UNIT)); | |
4662 | offset = size_diffop (offset, | |
4663 | convert (ssizetype, | |
4664 | BINFO_OFFSET (vbase))); | |
4665 | ||
c35cce41 | 4666 | /* And compute the offset of the virtual base. */ |
a55583e9 | 4667 | propagate_binfo_offsets (vbase, offset); |
c35cce41 MM |
4668 | /* Every virtual baseclass takes a least a UNIT, so that |
4669 | we can take it's address and get something different | |
4670 | for each base. */ | |
4671 | dsize += MAX (BITS_PER_UNIT, | |
4672 | tree_low_cst (CLASSTYPE_SIZE (basetype), 0)); | |
4673 | } | |
9785e4b1 | 4674 | |
c35cce41 MM |
4675 | /* Keep track of the offsets assigned to this virtual base. */ |
4676 | record_base_offsets (vbase, base_offsets); | |
4677 | } | |
4678 | } | |
80fd5f48 | 4679 | |
911a71a7 | 4680 | /* Now, go through the TYPE_BINFO hierarchy, setting the |
9d4c0187 MM |
4681 | BINFO_OFFSETs correctly for all non-primary copies of the virtual |
4682 | bases and their direct and indirect bases. The ambiguity checks | |
4683 | in get_base_distance depend on the BINFO_OFFSETs being set | |
4684 | correctly. */ | |
4685 | dfs_walk (TYPE_BINFO (t), dfs_set_offset_for_unshared_vbases, NULL, t); | |
4686 | ||
9785e4b1 MM |
4687 | /* If we had empty base classes that protruded beyond the end of the |
4688 | class, we didn't update DSIZE above; we were hoping to overlay | |
4689 | multiple such bases at the same location. */ | |
4690 | eoc = end_of_class (t, /*include_virtuals_p=*/1); | |
4691 | if (eoc * BITS_PER_UNIT > dsize) | |
4692 | dsize = (eoc + 1) * BITS_PER_UNIT; | |
4693 | ||
80fd5f48 MM |
4694 | /* Now, make sure that the total size of the type is a multiple of |
4695 | its alignment. */ | |
4696 | dsize = CEIL (dsize, TYPE_ALIGN (t)) * TYPE_ALIGN (t); | |
fed3cef0 RK |
4697 | TYPE_SIZE (t) = bitsize_int (dsize); |
4698 | TYPE_SIZE_UNIT (t) = convert (sizetype, | |
770ae6cc RK |
4699 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (t), |
4700 | bitsize_unit_node)); | |
9785e4b1 MM |
4701 | |
4702 | /* Check for ambiguous virtual bases. */ | |
4703 | if (extra_warnings) | |
c35cce41 MM |
4704 | for (vbases = CLASSTYPE_VBASECLASSES (t); |
4705 | vbases; | |
4706 | vbases = TREE_CHAIN (vbases)) | |
9785e4b1 | 4707 | { |
a55583e9 | 4708 | tree basetype = BINFO_TYPE (TREE_VALUE (vbases)); |
9785e4b1 MM |
4709 | if (get_base_distance (basetype, t, 0, (tree*)0) == -2) |
4710 | cp_warning ("virtual base `%T' inaccessible in `%T' due to ambiguity", | |
4711 | basetype, t); | |
4712 | } | |
80fd5f48 MM |
4713 | } |
4714 | ||
9785e4b1 MM |
4715 | /* Returns the offset of the byte just past the end of the base class |
4716 | with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then | |
4717 | only non-virtual bases are included. */ | |
80fd5f48 | 4718 | |
9785e4b1 MM |
4719 | static unsigned HOST_WIDE_INT |
4720 | end_of_class (t, include_virtuals_p) | |
4721 | tree t; | |
4722 | int include_virtuals_p; | |
80fd5f48 | 4723 | { |
9785e4b1 MM |
4724 | unsigned HOST_WIDE_INT result = 0; |
4725 | int i; | |
80fd5f48 | 4726 | |
9785e4b1 MM |
4727 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i) |
4728 | { | |
4729 | tree base_binfo; | |
4730 | tree offset; | |
4731 | unsigned HOST_WIDE_INT end_of_base; | |
5c24fba6 | 4732 | |
9785e4b1 MM |
4733 | base_binfo = BINFO_BASETYPE (TYPE_BINFO (t), i); |
4734 | ||
4735 | if (!include_virtuals_p | |
4736 | && TREE_VIA_VIRTUAL (base_binfo) | |
4737 | && !BINFO_PRIMARY_MARKED_P (base_binfo)) | |
4738 | continue; | |
80fd5f48 | 4739 | |
9785e4b1 MM |
4740 | offset = size_binop (PLUS_EXPR, |
4741 | BINFO_OFFSET (base_binfo), | |
4742 | CLASSTYPE_SIZE_UNIT (BINFO_TYPE (base_binfo))); | |
4743 | end_of_base = tree_low_cst (offset, /*pos=*/1); | |
4744 | if (end_of_base > result) | |
4745 | result = end_of_base; | |
4746 | } | |
80fd5f48 | 4747 | |
9785e4b1 | 4748 | return result; |
80fd5f48 MM |
4749 | } |
4750 | ||
2ef16140 MM |
4751 | /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate |
4752 | BINFO_OFFSETs for all of the base-classes. Position the vtable | |
4753 | pointer. */ | |
607cf131 | 4754 | |
2ef16140 | 4755 | static void |
da3d4dfa | 4756 | layout_class_type (t, empty_p, vfuns_p, |
051e6fd7 | 4757 | new_virtuals_p, overridden_virtuals_p) |
2ef16140 MM |
4758 | tree t; |
4759 | int *empty_p; | |
da3d4dfa | 4760 | int *vfuns_p; |
051e6fd7 MM |
4761 | tree *new_virtuals_p; |
4762 | tree *overridden_virtuals_p; | |
2ef16140 | 4763 | { |
5c24fba6 MM |
4764 | tree non_static_data_members; |
4765 | tree field; | |
4766 | tree vptr; | |
4767 | record_layout_info rli; | |
4768 | varray_type v; | |
9785e4b1 | 4769 | unsigned HOST_WIDE_INT eoc; |
5c24fba6 MM |
4770 | |
4771 | /* Keep track of the first non-static data member. */ | |
4772 | non_static_data_members = TYPE_FIELDS (t); | |
4773 | ||
770ae6cc RK |
4774 | /* Start laying out the record. */ |
4775 | rli = start_record_layout (t); | |
534170eb | 4776 | |
8026246f MM |
4777 | /* If possible, we reuse the virtual function table pointer from one |
4778 | of our base classes. */ | |
da3d4dfa | 4779 | determine_primary_base (t, vfuns_p); |
8026246f | 4780 | |
5c24fba6 | 4781 | /* Create a pointer to our virtual function table. */ |
da3d4dfa | 4782 | vptr = create_vtable_ptr (t, empty_p, vfuns_p, |
5c24fba6 MM |
4783 | new_virtuals_p, overridden_virtuals_p); |
4784 | ||
4785 | /* Under the new ABI, the vptr is always the first thing in the | |
4786 | class. */ | |
4787 | if (flag_new_abi && vptr) | |
4788 | { | |
4789 | TYPE_FIELDS (t) = chainon (vptr, TYPE_FIELDS (t)); | |
770ae6cc | 4790 | place_field (rli, vptr); |
5c24fba6 MM |
4791 | } |
4792 | ||
72a50ab0 MM |
4793 | /* Build FIELD_DECLs for all of the non-virtual base-types. */ |
4794 | v = build_base_fields (rli, empty_p); | |
607cf131 | 4795 | /* Add pointers to all of our virtual base-classes. */ |
5c24fba6 | 4796 | TYPE_FIELDS (t) = chainon (build_vbase_pointer_fields (rli, empty_p), |
607cf131 | 4797 | TYPE_FIELDS (t)); |
8d08fdba | 4798 | |
c1aa4de7 MM |
4799 | /* CLASSTYPE_INLINE_FRIENDS is really TYPE_NONCOPIED_PARTS. Thus, |
4800 | we have to save this before we start modifying | |
4801 | TYPE_NONCOPIED_PARTS. */ | |
2ef16140 | 4802 | fixup_inline_methods (t); |
c1aa4de7 | 4803 | |
5c24fba6 | 4804 | /* Layout the non-static data members. */ |
770ae6cc | 4805 | for (field = non_static_data_members; field; field = TREE_CHAIN (field)) |
5c24fba6 MM |
4806 | { |
4807 | tree binfo; | |
01955e96 MM |
4808 | tree type; |
4809 | tree padding; | |
5c24fba6 MM |
4810 | |
4811 | /* We still pass things that aren't non-static data members to | |
4812 | the back-end, in case it wants to do something with them. */ | |
4813 | if (TREE_CODE (field) != FIELD_DECL) | |
4814 | { | |
770ae6cc | 4815 | place_field (rli, field); |
5c24fba6 MM |
4816 | continue; |
4817 | } | |
4818 | ||
01955e96 MM |
4819 | type = TREE_TYPE (field); |
4820 | ||
4821 | /* If this field is a bit-field whose width is greater than its | |
4822 | type, then there are some special rules for allocating it | |
4823 | under the new ABI. Under the old ABI, there were no special | |
4824 | rules, but the back-end can't handle bitfields longer than a | |
4825 | `long long', so we use the same mechanism. */ | |
4826 | if (DECL_C_BIT_FIELD (field) | |
4827 | && ((flag_new_abi | |
4828 | && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field))) | |
4829 | || (!flag_new_abi | |
770ae6cc RK |
4830 | && 0 < compare_tree_int (DECL_SIZE (field), |
4831 | TYPE_PRECISION | |
4832 | (long_long_unsigned_type_node))))) | |
01955e96 MM |
4833 | { |
4834 | integer_type_kind itk; | |
4835 | tree integer_type; | |
4836 | ||
4837 | /* We must allocate the bits as if suitably aligned for the | |
4838 | longest integer type that fits in this many bits. type | |
4839 | of the field. Then, we are supposed to use the left over | |
4840 | bits as additional padding. */ | |
4841 | for (itk = itk_char; itk != itk_none; ++itk) | |
4842 | if (INT_CST_LT (DECL_SIZE (field), | |
4843 | TYPE_SIZE (integer_types[itk]))) | |
4844 | break; | |
4845 | ||
4846 | /* ITK now indicates a type that is too large for the | |
4847 | field. We have to back up by one to find the largest | |
4848 | type that fits. */ | |
4849 | integer_type = integer_types[itk - 1]; | |
770ae6cc RK |
4850 | padding = size_binop (MINUS_EXPR, DECL_SIZE (field), |
4851 | TYPE_SIZE (integer_type)); | |
01955e96 MM |
4852 | DECL_SIZE (field) = TYPE_SIZE (integer_type); |
4853 | DECL_ALIGN (field) = TYPE_ALIGN (integer_type); | |
11cf4d18 | 4854 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type); |
01955e96 MM |
4855 | } |
4856 | else | |
4857 | padding = NULL_TREE; | |
4858 | ||
5c24fba6 | 4859 | /* Create a dummy BINFO corresponding to this field. */ |
01955e96 | 4860 | binfo = make_binfo (size_zero_node, type, NULL_TREE, NULL_TREE); |
5c24fba6 MM |
4861 | unshare_base_binfos (binfo); |
4862 | layout_nonempty_base_or_field (rli, field, binfo, v); | |
01955e96 MM |
4863 | |
4864 | /* If we needed additional padding after this field, add it | |
4865 | now. */ | |
4866 | if (padding) | |
4867 | { | |
4868 | tree padding_field; | |
4869 | ||
4870 | padding_field = build_decl (FIELD_DECL, | |
4871 | NULL_TREE, | |
4872 | char_type_node); | |
4873 | DECL_BIT_FIELD (padding_field) = 1; | |
4874 | DECL_SIZE (padding_field) = padding; | |
4875 | DECL_ALIGN (padding_field) = 1; | |
11cf4d18 | 4876 | DECL_USER_ALIGN (padding_field) = 0; |
01955e96 MM |
4877 | layout_nonempty_base_or_field (rli, padding_field, NULL_TREE, v); |
4878 | } | |
5c24fba6 MM |
4879 | } |
4880 | ||
5c24fba6 MM |
4881 | /* It might be the case that we grew the class to allocate a |
4882 | zero-sized base class. That won't be reflected in RLI, yet, | |
4883 | because we are willing to overlay multiple bases at the same | |
4884 | offset. However, now we need to make sure that RLI is big enough | |
4885 | to reflect the entire class. */ | |
9785e4b1 | 4886 | eoc = end_of_class (t, /*include_virtuals_p=*/0); |
770ae6cc RK |
4887 | if (TREE_CODE (rli_size_unit_so_far (rli)) == INTEGER_CST |
4888 | && compare_tree_int (rli_size_unit_so_far (rli), eoc) < 0) | |
5c24fba6 | 4889 | { |
9785e4b1 MM |
4890 | /* We don't handle zero-sized base classes specially under the |
4891 | old ABI, so if we get here, we had better be operating under | |
4892 | the new ABI rules. */ | |
4893 | my_friendly_assert (flag_new_abi, 20000321); | |
770ae6cc RK |
4894 | rli->offset = size_binop (MAX_EXPR, rli->offset, size_int (eoc + 1)); |
4895 | rli->bitpos = bitsize_zero_node; | |
5c24fba6 MM |
4896 | } |
4897 | ||
58010b57 | 4898 | /* We make all structures have at least one element, so that they |
5c24fba6 MM |
4899 | have non-zero size. In the new ABI, the class may be empty even |
4900 | if it has basetypes. Therefore, we add the fake field after all | |
4901 | the other fields; if there are already FIELD_DECLs on the list, | |
4902 | their offsets will not be disturbed. */ | |
2ef16140 | 4903 | if (*empty_p) |
691c003d | 4904 | { |
5c24fba6 MM |
4905 | tree padding; |
4906 | ||
721c3b42 | 4907 | padding = build_decl (FIELD_DECL, NULL_TREE, char_type_node); |
770ae6cc | 4908 | place_field (rli, padding); |
c1aa4de7 | 4909 | TYPE_NONCOPIED_PARTS (t) |
534170eb | 4910 | = tree_cons (NULL_TREE, padding, TYPE_NONCOPIED_PARTS (t)); |
c1aa4de7 | 4911 | TREE_STATIC (TYPE_NONCOPIED_PARTS (t)) = 1; |
691c003d | 4912 | } |
c1aa4de7 | 4913 | |
5c24fba6 MM |
4914 | /* Under the old ABI, the vptr comes at the very end of the |
4915 | class. */ | |
4916 | if (!flag_new_abi && vptr) | |
4917 | { | |
770ae6cc | 4918 | place_field (rli, vptr); |
5c24fba6 MM |
4919 | TYPE_FIELDS (t) = chainon (TYPE_FIELDS (t), vptr); |
4920 | } | |
4921 | ||
3ef397c1 MM |
4922 | /* Let the back-end lay out the type. Note that at this point we |
4923 | have only included non-virtual base-classes; we will lay out the | |
4924 | virtual base classes later. So, the TYPE_SIZE/TYPE_ALIGN after | |
4925 | this call are not necessarily correct; they are just the size and | |
4926 | alignment when no virtual base clases are used. */ | |
5c24fba6 | 4927 | finish_record_layout (rli); |
58010b57 | 4928 | |
3ef397c1 MM |
4929 | /* Delete all zero-width bit-fields from the list of fields. Now |
4930 | that the type is laid out they are no longer important. */ | |
4931 | remove_zero_width_bit_fields (t); | |
4932 | ||
9a71c18b | 4933 | /* Remember the size and alignment of the class before adding |
0b41abe6 | 4934 | the virtual bases. */ |
2ef16140 | 4935 | if (*empty_p && flag_new_abi) |
06ceef4e | 4936 | { |
770ae6cc | 4937 | CLASSTYPE_SIZE (t) = bitsize_zero_node; |
fed3cef0 | 4938 | CLASSTYPE_SIZE_UNIT (t) = size_zero_node; |
06ceef4e | 4939 | } |
911a71a7 | 4940 | else if (flag_new_abi) |
06ceef4e RK |
4941 | { |
4942 | CLASSTYPE_SIZE (t) = TYPE_BINFO_SIZE (t); | |
4943 | CLASSTYPE_SIZE_UNIT (t) = TYPE_BINFO_SIZE_UNIT (t); | |
4944 | } | |
732dcb6f | 4945 | else |
06ceef4e RK |
4946 | { |
4947 | CLASSTYPE_SIZE (t) = TYPE_SIZE (t); | |
4948 | CLASSTYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (t); | |
4949 | } | |
4950 | ||
0b41abe6 | 4951 | CLASSTYPE_ALIGN (t) = TYPE_ALIGN (t); |
11cf4d18 | 4952 | CLASSTYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (t); |
0b41abe6 | 4953 | |
8d08fdba MS |
4954 | /* Set the TYPE_DECL for this type to contain the right |
4955 | value for DECL_OFFSET, so that we can use it as part | |
4956 | of a COMPONENT_REF for multiple inheritance. */ | |
d2e5ee5c | 4957 | layout_decl (TYPE_MAIN_DECL (t), 0); |
8d08fdba | 4958 | |
7177d104 MS |
4959 | /* Now fix up any virtual base class types that we left lying |
4960 | around. We must get these done before we try to lay out the | |
5c24fba6 MM |
4961 | virtual function table. As a side-effect, this will remove the |
4962 | base subobject fields. */ | |
9785e4b1 MM |
4963 | layout_virtual_bases (t, &v); |
4964 | ||
4965 | /* Clean up. */ | |
4966 | VARRAY_FREE (v); | |
2ef16140 | 4967 | } |
c35cce41 | 4968 | |
2ef16140 MM |
4969 | /* Create a RECORD_TYPE or UNION_TYPE node for a C struct or union declaration |
4970 | (or C++ class declaration). | |
4971 | ||
4972 | For C++, we must handle the building of derived classes. | |
4973 | Also, C++ allows static class members. The way that this is | |
4974 | handled is to keep the field name where it is (as the DECL_NAME | |
665f2503 | 4975 | of the field), and place the overloaded decl in the bit position |
2ef16140 MM |
4976 | of the field. layout_record and layout_union will know about this. |
4977 | ||
4978 | More C++ hair: inline functions have text in their | |
4979 | DECL_PENDING_INLINE_INFO nodes which must somehow be parsed into | |
4980 | meaningful tree structure. After the struct has been laid out, set | |
4981 | things up so that this can happen. | |
4982 | ||
4983 | And still more: virtual functions. In the case of single inheritance, | |
4984 | when a new virtual function is seen which redefines a virtual function | |
4985 | from the base class, the new virtual function is placed into | |
4986 | the virtual function table at exactly the same address that | |
4987 | it had in the base class. When this is extended to multiple | |
4988 | inheritance, the same thing happens, except that multiple virtual | |
4989 | function tables must be maintained. The first virtual function | |
4990 | table is treated in exactly the same way as in the case of single | |
4991 | inheritance. Additional virtual function tables have different | |
4992 | DELTAs, which tell how to adjust `this' to point to the right thing. | |
4993 | ||
4994 | ATTRIBUTES is the set of decl attributes to be applied, if any. */ | |
4995 | ||
4996 | void | |
4997 | finish_struct_1 (t) | |
4998 | tree t; | |
4999 | { | |
5000 | tree x; | |
da3d4dfa | 5001 | int vfuns; |
051e6fd7 MM |
5002 | /* The NEW_VIRTUALS is a TREE_LIST. The TREE_VALUE of each node is |
5003 | a FUNCTION_DECL. Each of these functions is a virtual function | |
5004 | declared in T that does not override any virtual function from a | |
5005 | base class. */ | |
5006 | tree new_virtuals = NULL_TREE; | |
5007 | /* The OVERRIDDEN_VIRTUALS list is like the NEW_VIRTUALS list, | |
5008 | except that each declaration here overrides the declaration from | |
5009 | a base class. */ | |
5010 | tree overridden_virtuals = NULL_TREE; | |
2ef16140 MM |
5011 | int n_fields = 0; |
5012 | tree vfield; | |
2ef16140 MM |
5013 | int empty = 1; |
5014 | ||
d0f062fb | 5015 | if (COMPLETE_TYPE_P (t)) |
2ef16140 MM |
5016 | { |
5017 | if (IS_AGGR_TYPE (t)) | |
5018 | cp_error ("redefinition of `%#T'", t); | |
5019 | else | |
5020 | my_friendly_abort (172); | |
5021 | popclass (); | |
5022 | return; | |
5023 | } | |
5024 | ||
5025 | GNU_xref_decl (current_function_decl, t); | |
5026 | ||
5027 | /* If this type was previously laid out as a forward reference, | |
5028 | make sure we lay it out again. */ | |
2ef16140 MM |
5029 | TYPE_SIZE (t) = NULL_TREE; |
5030 | CLASSTYPE_GOT_SEMICOLON (t) = 0; | |
911a71a7 | 5031 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
da3d4dfa | 5032 | vfuns = 0; |
2ef16140 | 5033 | CLASSTYPE_RTTI (t) = NULL_TREE; |
2ef16140 MM |
5034 | |
5035 | /* Do end-of-class semantic processing: checking the validity of the | |
03702748 | 5036 | bases and members and add implicitly generated methods. */ |
2ef16140 MM |
5037 | check_bases_and_members (t, &empty); |
5038 | ||
5039 | /* Layout the class itself. */ | |
da3d4dfa | 5040 | layout_class_type (t, &empty, &vfuns, |
051e6fd7 | 5041 | &new_virtuals, &overridden_virtuals); |
8ebeee52 | 5042 | |
2986ae00 MS |
5043 | /* Set up the DECL_FIELD_BITPOS of the vfield if we need to, as we |
5044 | might need to know it for setting up the offsets in the vtable | |
5045 | (or in thunks) below. */ | |
3ef397c1 | 5046 | vfield = TYPE_VFIELD (t); |
2986ae00 MS |
5047 | if (vfield != NULL_TREE |
5048 | && DECL_FIELD_CONTEXT (vfield) != t) | |
5049 | { | |
ec386958 MM |
5050 | tree binfo = get_binfo (DECL_FIELD_CONTEXT (vfield), t, 0); |
5051 | ||
0acf7199 | 5052 | vfield = copy_decl (vfield); |
2986ae00 | 5053 | |
2986ae00 | 5054 | DECL_FIELD_CONTEXT (vfield) = t; |
770ae6cc RK |
5055 | DECL_FIELD_OFFSET (vfield) |
5056 | = size_binop (PLUS_EXPR, | |
ec386958 | 5057 | BINFO_OFFSET (binfo), |
770ae6cc | 5058 | DECL_FIELD_OFFSET (vfield)); |
d3a3fb6a | 5059 | TYPE_VFIELD (t) = vfield; |
2986ae00 | 5060 | } |
4c6b7393 | 5061 | |
a68ad5bd | 5062 | overridden_virtuals |
da3d4dfa | 5063 | = modify_all_vtables (t, &vfuns, nreverse (overridden_virtuals)); |
db5ae43f | 5064 | |
23656158 MM |
5065 | /* If we created a new vtbl pointer for this class, add it to the |
5066 | list. */ | |
5067 | if (TYPE_VFIELD (t) && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5068 | CLASSTYPE_VFIELDS (t) | |
5069 | = chainon (CLASSTYPE_VFIELDS (t), build_tree_list (NULL_TREE, t)); | |
5070 | ||
5e19c053 | 5071 | /* If necessary, create the primary vtable for this class. */ |
051e6fd7 | 5072 | if (new_virtuals |
a68ad5bd | 5073 | || overridden_virtuals |
bbd15aac | 5074 | || (TYPE_CONTAINS_VPTR_P (t) && vptrs_present_everywhere_p ())) |
8d08fdba | 5075 | { |
051e6fd7 | 5076 | new_virtuals = nreverse (new_virtuals); |
8d08fdba | 5077 | /* We must enter these virtuals into the table. */ |
3ef397c1 | 5078 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
da3d4dfa | 5079 | build_primary_vtable (NULL_TREE, t); |
3c9d6359 | 5080 | else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t), t)) |
0533d788 MM |
5081 | /* Here we know enough to change the type of our virtual |
5082 | function table, but we will wait until later this function. */ | |
28531dd0 | 5083 | build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t); |
8d08fdba MS |
5084 | |
5085 | /* If this type has basetypes with constructors, then those | |
5086 | constructors might clobber the virtual function table. But | |
5087 | they don't if the derived class shares the exact vtable of the base | |
5088 | class. */ | |
5089 | ||
5090 | CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1; | |
5091 | } | |
bbd15aac MM |
5092 | /* If we didn't need a new vtable, see if we should copy one from |
5093 | the base. */ | |
3ef397c1 | 5094 | else if (CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
8d08fdba | 5095 | { |
3ef397c1 MM |
5096 | tree binfo = CLASSTYPE_PRIMARY_BINFO (t); |
5097 | ||
31f8e4f3 MM |
5098 | /* If this class uses a different vtable than its primary base |
5099 | then when we will need to initialize our vptr after the base | |
5100 | class constructor runs. */ | |
8d08fdba MS |
5101 | if (TYPE_BINFO_VTABLE (t) != BINFO_VTABLE (binfo)) |
5102 | CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1; | |
5103 | } | |
5104 | ||
bbd15aac | 5105 | if (TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5106 | { |
1eb4bea9 MM |
5107 | if (TYPE_BINFO_VTABLE (t)) |
5108 | my_friendly_assert (DECL_VIRTUAL_P (TYPE_BINFO_VTABLE (t)), | |
5109 | 20000116); | |
5110 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5111 | my_friendly_assert (TYPE_BINFO_VIRTUALS (t) == NULL_TREE, | |
5112 | 20000116); | |
5113 | ||
da3d4dfa | 5114 | CLASSTYPE_VSIZE (t) = vfuns; |
1eb4bea9 MM |
5115 | /* Entries for virtual functions defined in the primary base are |
5116 | followed by entries for new functions unique to this class. */ | |
5117 | TYPE_BINFO_VIRTUALS (t) | |
051e6fd7 | 5118 | = chainon (TYPE_BINFO_VIRTUALS (t), new_virtuals); |
a68ad5bd MM |
5119 | /* Finally, add entries for functions that override virtuals |
5120 | from non-primary bases. */ | |
5121 | TYPE_BINFO_VIRTUALS (t) | |
5122 | = chainon (TYPE_BINFO_VIRTUALS (t), overridden_virtuals); | |
8d08fdba MS |
5123 | } |
5124 | ||
d2c5305b | 5125 | finish_struct_bits (t); |
8d08fdba | 5126 | |
f30432d7 MS |
5127 | /* Complete the rtl for any static member objects of the type we're |
5128 | working on. */ | |
58010b57 | 5129 | for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x)) |
8d08fdba | 5130 | { |
8d08fdba MS |
5131 | if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x) |
5132 | && TREE_TYPE (x) == t) | |
5133 | { | |
5134 | DECL_MODE (x) = TYPE_MODE (t); | |
5135 | make_decl_rtl (x, NULL, 0); | |
5136 | } | |
5137 | } | |
5138 | ||
f90cdf34 | 5139 | /* Done with FIELDS...now decide whether to sort these for |
58010b57 | 5140 | faster lookups later. |
f90cdf34 MT |
5141 | |
5142 | The C front-end only does this when n_fields > 15. We use | |
5143 | a smaller number because most searches fail (succeeding | |
5144 | ultimately as the search bores through the inheritance | |
5145 | hierarchy), and we want this failure to occur quickly. */ | |
5146 | ||
58010b57 MM |
5147 | n_fields = count_fields (TYPE_FIELDS (t)); |
5148 | if (n_fields > 7) | |
f90cdf34 MT |
5149 | { |
5150 | tree field_vec = make_tree_vec (n_fields); | |
58010b57 | 5151 | add_fields_to_vec (TYPE_FIELDS (t), field_vec, 0); |
f90cdf34 MT |
5152 | qsort (&TREE_VEC_ELT (field_vec, 0), n_fields, sizeof (tree), |
5153 | (int (*)(const void *, const void *))field_decl_cmp); | |
5154 | if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t))) | |
5155 | retrofit_lang_decl (TYPE_MAIN_DECL (t)); | |
5156 | DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec; | |
5157 | } | |
5158 | ||
8d08fdba MS |
5159 | if (TYPE_HAS_CONSTRUCTOR (t)) |
5160 | { | |
5161 | tree vfields = CLASSTYPE_VFIELDS (t); | |
5162 | ||
5163 | while (vfields) | |
5164 | { | |
5165 | /* Mark the fact that constructor for T | |
5166 | could affect anybody inheriting from T | |
5167 | who wants to initialize vtables for VFIELDS's type. */ | |
5168 | if (VF_DERIVED_VALUE (vfields)) | |
5169 | TREE_ADDRESSABLE (vfields) = 1; | |
5170 | vfields = TREE_CHAIN (vfields); | |
5171 | } | |
8d08fdba | 5172 | } |
8d08fdba | 5173 | |
8d7a5379 MM |
5174 | /* Make the rtl for any new vtables we have created, and unmark |
5175 | the base types we marked. */ | |
5176 | finish_vtbls (t); | |
23656158 MM |
5177 | /* Build the VTT for T. */ |
5178 | build_vtt (t); | |
8d7a5379 | 5179 | |
c35cce41 | 5180 | if (TYPE_VFIELD (t)) |
8d08fdba | 5181 | { |
e92cc029 | 5182 | /* In addition to this one, all the other vfields should be listed. */ |
8d08fdba MS |
5183 | /* Before that can be done, we have to have FIELD_DECLs for them, and |
5184 | a place to find them. */ | |
c1aa4de7 MM |
5185 | TYPE_NONCOPIED_PARTS (t) |
5186 | = tree_cons (default_conversion (TYPE_BINFO_VTABLE (t)), | |
3ef397c1 | 5187 | TYPE_VFIELD (t), TYPE_NONCOPIED_PARTS (t)); |
8d08fdba MS |
5188 | |
5189 | if (warn_nonvdtor && TYPE_HAS_DESTRUCTOR (t) | |
58010b57 | 5190 | && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1)) == NULL_TREE) |
8251199e | 5191 | cp_warning ("`%#T' has virtual functions but non-virtual destructor", |
8d08fdba MS |
5192 | t); |
5193 | } | |
5194 | ||
8145f082 | 5195 | hack_incomplete_structures (t); |
8d08fdba | 5196 | |
9e9ff709 MS |
5197 | if (warn_overloaded_virtual) |
5198 | warn_hidden (t); | |
8d08fdba | 5199 | |
ae673f14 | 5200 | maybe_suppress_debug_info (t); |
8d08fdba | 5201 | |
d2e5ee5c MS |
5202 | /* Finish debugging output for this type. */ |
5203 | rest_of_type_compilation (t, toplevel_bindings_p ()); | |
8d08fdba | 5204 | } |
f30432d7 | 5205 | |
61a127b3 MM |
5206 | /* When T was built up, the member declarations were added in reverse |
5207 | order. Rearrange them to declaration order. */ | |
5208 | ||
5209 | void | |
5210 | unreverse_member_declarations (t) | |
5211 | tree t; | |
5212 | { | |
5213 | tree next; | |
5214 | tree prev; | |
5215 | tree x; | |
5216 | ||
5217 | /* The TYPE_FIELDS, TYPE_METHODS, and CLASSTYPE_TAGS are all in | |
5218 | reverse order. Put them in declaration order now. */ | |
5219 | TYPE_METHODS (t) = nreverse (TYPE_METHODS (t)); | |
5220 | CLASSTYPE_TAGS (t) = nreverse (CLASSTYPE_TAGS (t)); | |
5221 | ||
5222 | /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in | |
5223 | reverse order, so we can't just use nreverse. */ | |
5224 | prev = NULL_TREE; | |
5225 | for (x = TYPE_FIELDS (t); | |
5226 | x && TREE_CODE (x) != TYPE_DECL; | |
5227 | x = next) | |
5228 | { | |
5229 | next = TREE_CHAIN (x); | |
5230 | TREE_CHAIN (x) = prev; | |
5231 | prev = x; | |
5232 | } | |
5233 | if (prev) | |
5234 | { | |
5235 | TREE_CHAIN (TYPE_FIELDS (t)) = x; | |
5236 | if (prev) | |
5237 | TYPE_FIELDS (t) = prev; | |
5238 | } | |
5239 | } | |
5240 | ||
f30432d7 | 5241 | tree |
9f33663b | 5242 | finish_struct (t, attributes) |
61a127b3 | 5243 | tree t, attributes; |
f30432d7 | 5244 | { |
61a127b3 MM |
5245 | /* Now that we've got all the field declarations, reverse everything |
5246 | as necessary. */ | |
5247 | unreverse_member_declarations (t); | |
f30432d7 | 5248 | |
6467930b MS |
5249 | cplus_decl_attributes (t, attributes, NULL_TREE); |
5250 | ||
5566b478 | 5251 | if (processing_template_decl) |
f30432d7 | 5252 | { |
b0e0b31f | 5253 | finish_struct_methods (t); |
867580ce | 5254 | TYPE_SIZE (t) = bitsize_zero_node; |
6f1b4c42 | 5255 | } |
f30432d7 | 5256 | else |
9f33663b | 5257 | finish_struct_1 (t); |
5566b478 MS |
5258 | |
5259 | TYPE_BEING_DEFINED (t) = 0; | |
8f032717 | 5260 | |
5566b478 | 5261 | if (current_class_type) |
b74a0560 | 5262 | popclass (); |
5566b478 | 5263 | else |
8251199e | 5264 | error ("trying to finish struct, but kicked out due to previous parse errors."); |
5566b478 | 5265 | |
ae673f14 JM |
5266 | if (processing_template_decl) |
5267 | { | |
5268 | tree scope = current_scope (); | |
5269 | if (scope && TREE_CODE (scope) == FUNCTION_DECL) | |
5270 | add_tree (build_min (TAG_DEFN, t)); | |
5271 | } | |
5272 | ||
5566b478 | 5273 | return t; |
f30432d7 | 5274 | } |
8d08fdba | 5275 | \f |
51ddb82e | 5276 | /* Return the dynamic type of INSTANCE, if known. |
8d08fdba MS |
5277 | Used to determine whether the virtual function table is needed |
5278 | or not. | |
5279 | ||
5280 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5281 | of our knowledge of its type. *NONNULL should be initialized |
5282 | before this function is called. */ | |
e92cc029 | 5283 | |
d8e178a0 | 5284 | static tree |
51ddb82e | 5285 | fixed_type_or_null (instance, nonnull) |
8d08fdba MS |
5286 | tree instance; |
5287 | int *nonnull; | |
5288 | { | |
5289 | switch (TREE_CODE (instance)) | |
5290 | { | |
5291 | case INDIRECT_REF: | |
5292 | /* Check that we are not going through a cast of some sort. */ | |
5293 | if (TREE_TYPE (instance) | |
5294 | == TREE_TYPE (TREE_TYPE (TREE_OPERAND (instance, 0)))) | |
5295 | instance = TREE_OPERAND (instance, 0); | |
5296 | /* fall through... */ | |
5297 | case CALL_EXPR: | |
5298 | /* This is a call to a constructor, hence it's never zero. */ | |
5299 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5300 | { | |
5301 | if (nonnull) | |
5302 | *nonnull = 1; | |
51ddb82e | 5303 | return TREE_TYPE (instance); |
8d08fdba | 5304 | } |
51ddb82e | 5305 | return NULL_TREE; |
8d08fdba MS |
5306 | |
5307 | case SAVE_EXPR: | |
5308 | /* This is a call to a constructor, hence it's never zero. */ | |
5309 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5310 | { | |
5311 | if (nonnull) | |
5312 | *nonnull = 1; | |
51ddb82e | 5313 | return TREE_TYPE (instance); |
8d08fdba | 5314 | } |
51ddb82e | 5315 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull); |
8d08fdba MS |
5316 | |
5317 | case RTL_EXPR: | |
51ddb82e | 5318 | return NULL_TREE; |
8d08fdba MS |
5319 | |
5320 | case PLUS_EXPR: | |
5321 | case MINUS_EXPR: | |
5322 | if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST) | |
5323 | /* Propagate nonnull. */ | |
51ddb82e | 5324 | fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull); |
8d08fdba | 5325 | if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR) |
51ddb82e JM |
5326 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull); |
5327 | return NULL_TREE; | |
8d08fdba MS |
5328 | |
5329 | case NOP_EXPR: | |
5330 | case CONVERT_EXPR: | |
51ddb82e | 5331 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull); |
8d08fdba MS |
5332 | |
5333 | case ADDR_EXPR: | |
5334 | if (nonnull) | |
5335 | *nonnull = 1; | |
51ddb82e | 5336 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull); |
8d08fdba MS |
5337 | |
5338 | case COMPONENT_REF: | |
51ddb82e | 5339 | return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull); |
8d08fdba | 5340 | |
8d08fdba MS |
5341 | case VAR_DECL: |
5342 | case FIELD_DECL: | |
5343 | if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE | |
5344 | && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance)))) | |
5345 | { | |
5346 | if (nonnull) | |
5347 | *nonnull = 1; | |
51ddb82e | 5348 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba | 5349 | } |
e92cc029 | 5350 | /* fall through... */ |
8d08fdba MS |
5351 | case TARGET_EXPR: |
5352 | case PARM_DECL: | |
5353 | if (IS_AGGR_TYPE (TREE_TYPE (instance))) | |
5354 | { | |
5355 | if (nonnull) | |
5356 | *nonnull = 1; | |
51ddb82e | 5357 | return TREE_TYPE (instance); |
8d08fdba MS |
5358 | } |
5359 | else if (nonnull) | |
5360 | { | |
4ac14744 | 5361 | if (instance == current_class_ptr |
8d08fdba MS |
5362 | && flag_this_is_variable <= 0) |
5363 | { | |
51ddb82e JM |
5364 | /* Normally, 'this' must be non-null. */ |
5365 | if (flag_this_is_variable == 0) | |
5366 | *nonnull = 1; | |
5367 | ||
5368 | /* <0 means we're in a constructor and we know our type. */ | |
8d08fdba | 5369 | if (flag_this_is_variable < 0) |
51ddb82e | 5370 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba MS |
5371 | } |
5372 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) | |
5373 | /* Reference variables should be references to objects. */ | |
5374 | *nonnull = 1; | |
5375 | } | |
51ddb82e | 5376 | return NULL_TREE; |
8d08fdba MS |
5377 | |
5378 | default: | |
51ddb82e | 5379 | return NULL_TREE; |
8d08fdba MS |
5380 | } |
5381 | } | |
51ddb82e JM |
5382 | |
5383 | /* Return non-zero if the dynamic type of INSTANCE is known, and equivalent | |
5384 | to the static type. We also handle the case where INSTANCE is really | |
5385 | a pointer. | |
5386 | ||
5387 | Used to determine whether the virtual function table is needed | |
5388 | or not. | |
5389 | ||
5390 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5391 | of our knowledge of its type. *NONNULL should be initialized |
5392 | before this function is called. */ | |
51ddb82e JM |
5393 | |
5394 | int | |
5395 | resolves_to_fixed_type_p (instance, nonnull) | |
5396 | tree instance; | |
5397 | int *nonnull; | |
5398 | { | |
5399 | tree t = TREE_TYPE (instance); | |
5400 | tree fixed = fixed_type_or_null (instance, nonnull); | |
5401 | if (fixed == NULL_TREE) | |
5402 | return 0; | |
5403 | if (POINTER_TYPE_P (t)) | |
5404 | t = TREE_TYPE (t); | |
9edc3913 | 5405 | return same_type_ignoring_top_level_qualifiers_p (t, fixed); |
51ddb82e JM |
5406 | } |
5407 | ||
8d08fdba MS |
5408 | \f |
5409 | void | |
5410 | init_class_processing () | |
5411 | { | |
5412 | current_class_depth = 0; | |
61a127b3 MM |
5413 | current_class_stack_size = 10; |
5414 | current_class_stack | |
5415 | = (class_stack_node_t) xmalloc (current_class_stack_size | |
5416 | * sizeof (struct class_stack_node)); | |
1f6e1acc AS |
5417 | VARRAY_TREE_INIT (local_classes, 8, "local_classes"); |
5418 | ggc_add_tree_varray_root (&local_classes, 1); | |
8d08fdba | 5419 | |
be99da77 | 5420 | access_default_node = build_int_2 (0, 0); |
c35cce41 MM |
5421 | access_public_node = build_int_2 (ak_public, 0); |
5422 | access_protected_node = build_int_2 (ak_protected, 0); | |
5423 | access_private_node = build_int_2 (ak_private, 0); | |
be99da77 | 5424 | access_default_virtual_node = build_int_2 (4, 0); |
c35cce41 MM |
5425 | access_public_virtual_node = build_int_2 (4 | ak_public, 0); |
5426 | access_protected_virtual_node = build_int_2 (4 | ak_protected, 0); | |
5427 | access_private_virtual_node = build_int_2 (4 | ak_private, 0); | |
8d08fdba MS |
5428 | } |
5429 | ||
5430 | /* Set current scope to NAME. CODE tells us if this is a | |
5431 | STRUCT, UNION, or ENUM environment. | |
5432 | ||
5433 | NAME may end up being NULL_TREE if this is an anonymous or | |
5434 | late-bound struct (as in "struct { ... } foo;") */ | |
5435 | ||
5436 | /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE to | |
5437 | appropriate values, found by looking up the type definition of | |
5438 | NAME (as a CODE). | |
5439 | ||
5440 | If MODIFY is 1, we set IDENTIFIER_CLASS_VALUE's of names | |
5441 | which can be seen locally to the class. They are shadowed by | |
5442 | any subsequent local declaration (including parameter names). | |
5443 | ||
5444 | If MODIFY is 2, we set IDENTIFIER_CLASS_VALUE's of names | |
5445 | which have static meaning (i.e., static members, static | |
5446 | member functions, enum declarations, etc). | |
5447 | ||
5448 | If MODIFY is 3, we set IDENTIFIER_CLASS_VALUE of names | |
5449 | which can be seen locally to the class (as in 1), but | |
5450 | know that we are doing this for declaration purposes | |
5451 | (i.e. friend foo::bar (int)). | |
5452 | ||
5453 | So that we may avoid calls to lookup_name, we cache the _TYPE | |
5454 | nodes of local TYPE_DECLs in the TREE_TYPE field of the name. | |
5455 | ||
5456 | For multiple inheritance, we perform a two-pass depth-first search | |
5457 | of the type lattice. The first pass performs a pre-order search, | |
5458 | marking types after the type has had its fields installed in | |
5459 | the appropriate IDENTIFIER_CLASS_VALUE slot. The second pass merely | |
5460 | unmarks the marked types. If a field or member function name | |
5461 | appears in an ambiguous way, the IDENTIFIER_CLASS_VALUE of | |
5462 | that name becomes `error_mark_node'. */ | |
5463 | ||
5464 | void | |
5465 | pushclass (type, modify) | |
5466 | tree type; | |
5467 | int modify; | |
5468 | { | |
7fb4a8f7 | 5469 | type = TYPE_MAIN_VARIANT (type); |
8d08fdba | 5470 | |
61a127b3 MM |
5471 | /* Make sure there is enough room for the new entry on the stack. */ |
5472 | if (current_class_depth + 1 >= current_class_stack_size) | |
8d08fdba | 5473 | { |
61a127b3 MM |
5474 | current_class_stack_size *= 2; |
5475 | current_class_stack | |
5476 | = (class_stack_node_t) xrealloc (current_class_stack, | |
5477 | current_class_stack_size | |
5478 | * sizeof (struct class_stack_node)); | |
8d08fdba MS |
5479 | } |
5480 | ||
61a127b3 MM |
5481 | /* Insert a new entry on the class stack. */ |
5482 | current_class_stack[current_class_depth].name = current_class_name; | |
5483 | current_class_stack[current_class_depth].type = current_class_type; | |
5484 | current_class_stack[current_class_depth].access = current_access_specifier; | |
8f032717 | 5485 | current_class_stack[current_class_depth].names_used = 0; |
61a127b3 MM |
5486 | current_class_depth++; |
5487 | ||
5488 | /* Now set up the new type. */ | |
8d08fdba MS |
5489 | current_class_name = TYPE_NAME (type); |
5490 | if (TREE_CODE (current_class_name) == TYPE_DECL) | |
5491 | current_class_name = DECL_NAME (current_class_name); | |
5492 | current_class_type = type; | |
5493 | ||
61a127b3 MM |
5494 | /* By default, things in classes are private, while things in |
5495 | structures or unions are public. */ | |
5496 | current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type) | |
5497 | ? access_private_node | |
5498 | : access_public_node); | |
5499 | ||
8d08fdba | 5500 | if (previous_class_type != NULL_TREE |
8f032717 | 5501 | && (type != previous_class_type |
d0f062fb | 5502 | || !COMPLETE_TYPE_P (previous_class_type)) |
8d08fdba MS |
5503 | && current_class_depth == 1) |
5504 | { | |
5505 | /* Forcibly remove any old class remnants. */ | |
8f032717 | 5506 | invalidate_class_lookup_cache (); |
8d08fdba MS |
5507 | } |
5508 | ||
8f032717 MM |
5509 | /* If we're about to enter a nested class, clear |
5510 | IDENTIFIER_CLASS_VALUE for the enclosing classes. */ | |
5511 | if (modify && current_class_depth > 1) | |
5512 | clear_identifier_class_values (); | |
5513 | ||
8d08fdba MS |
5514 | pushlevel_class (); |
5515 | ||
37c46b43 | 5516 | #if 0 |
5566b478 MS |
5517 | if (CLASSTYPE_TEMPLATE_INFO (type)) |
5518 | overload_template_name (type); | |
37c46b43 | 5519 | #endif |
5566b478 | 5520 | |
8d08fdba MS |
5521 | if (modify) |
5522 | { | |
5566b478 | 5523 | if (type != previous_class_type || current_class_depth > 1) |
8f032717 | 5524 | push_class_decls (type); |
8d08fdba MS |
5525 | else |
5526 | { | |
5527 | tree item; | |
5528 | ||
f181d4ae MM |
5529 | /* We are re-entering the same class we just left, so we |
5530 | don't have to search the whole inheritance matrix to find | |
5531 | all the decls to bind again. Instead, we install the | |
5532 | cached class_shadowed list, and walk through it binding | |
5533 | names and setting up IDENTIFIER_TYPE_VALUEs. */ | |
8d08fdba MS |
5534 | set_class_shadows (previous_class_values); |
5535 | for (item = previous_class_values; item; item = TREE_CHAIN (item)) | |
5536 | { | |
5537 | tree id = TREE_PURPOSE (item); | |
d8f8dca1 | 5538 | tree decl = TREE_TYPE (item); |
8d08fdba | 5539 | |
f181d4ae | 5540 | push_class_binding (id, decl); |
8d08fdba MS |
5541 | if (TREE_CODE (decl) == TYPE_DECL) |
5542 | set_identifier_type_value (id, TREE_TYPE (decl)); | |
5543 | } | |
5544 | unuse_fields (type); | |
5545 | } | |
5546 | ||
280f9385 | 5547 | storetags (CLASSTYPE_TAGS (type)); |
8f032717 MM |
5548 | } |
5549 | } | |
5550 | ||
5551 | /* When we exit a toplevel class scope, we save the | |
5552 | IDENTIFIER_CLASS_VALUEs so that we can restore them quickly if we | |
5553 | reenter the class. Here, we've entered some other class, so we | |
5554 | must invalidate our cache. */ | |
8d08fdba | 5555 | |
8f032717 MM |
5556 | void |
5557 | invalidate_class_lookup_cache () | |
5558 | { | |
8f032717 MM |
5559 | tree t; |
5560 | ||
5561 | /* This code can be seen as a cache miss. When we've cached a | |
5562 | class' scope's bindings and we can't use them, we need to reset | |
5563 | them. This is it! */ | |
5564 | for (t = previous_class_values; t; t = TREE_CHAIN (t)) | |
5565 | IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE; | |
8f032717 MM |
5566 | |
5567 | previous_class_type = NULL_TREE; | |
8d08fdba MS |
5568 | } |
5569 | ||
5570 | /* Get out of the current class scope. If we were in a class scope | |
b74a0560 | 5571 | previously, that is the one popped to. */ |
e92cc029 | 5572 | |
8d08fdba | 5573 | void |
b74a0560 | 5574 | popclass () |
8d08fdba | 5575 | { |
273a708f | 5576 | poplevel_class (); |
8d08fdba | 5577 | /* Since poplevel_class does the popping of class decls nowadays, |
b74a0560 MM |
5578 | this really only frees the obstack used for these decls. */ |
5579 | pop_class_decls (); | |
8d08fdba MS |
5580 | |
5581 | current_class_depth--; | |
61a127b3 MM |
5582 | current_class_name = current_class_stack[current_class_depth].name; |
5583 | current_class_type = current_class_stack[current_class_depth].type; | |
5584 | current_access_specifier = current_class_stack[current_class_depth].access; | |
8f032717 MM |
5585 | if (current_class_stack[current_class_depth].names_used) |
5586 | splay_tree_delete (current_class_stack[current_class_depth].names_used); | |
8d08fdba MS |
5587 | } |
5588 | ||
70adf8a9 JM |
5589 | /* Returns 1 if current_class_type is either T or a nested type of T. |
5590 | We start looking from 1 because entry 0 is from global scope, and has | |
5591 | no type. */ | |
b9082e8a JM |
5592 | |
5593 | int | |
5594 | currently_open_class (t) | |
5595 | tree t; | |
5596 | { | |
5597 | int i; | |
5598 | if (t == current_class_type) | |
5599 | return 1; | |
70adf8a9 | 5600 | for (i = 1; i < current_class_depth; ++i) |
61a127b3 | 5601 | if (current_class_stack [i].type == t) |
b9082e8a JM |
5602 | return 1; |
5603 | return 0; | |
5604 | } | |
5605 | ||
70adf8a9 JM |
5606 | /* If either current_class_type or one of its enclosing classes are derived |
5607 | from T, return the appropriate type. Used to determine how we found | |
5608 | something via unqualified lookup. */ | |
5609 | ||
5610 | tree | |
5611 | currently_open_derived_class (t) | |
5612 | tree t; | |
5613 | { | |
5614 | int i; | |
5615 | ||
5616 | if (DERIVED_FROM_P (t, current_class_type)) | |
5617 | return current_class_type; | |
5618 | ||
5619 | for (i = current_class_depth - 1; i > 0; --i) | |
5620 | if (DERIVED_FROM_P (t, current_class_stack[i].type)) | |
5621 | return current_class_stack[i].type; | |
5622 | ||
5623 | return NULL_TREE; | |
5624 | } | |
5625 | ||
8d08fdba MS |
5626 | /* When entering a class scope, all enclosing class scopes' names with |
5627 | static meaning (static variables, static functions, types and enumerators) | |
5628 | have to be visible. This recursive function calls pushclass for all | |
5629 | enclosing class contexts until global or a local scope is reached. | |
5630 | TYPE is the enclosed class and MODIFY is equivalent with the pushclass | |
5631 | formal of the same name. */ | |
5632 | ||
5633 | void | |
5634 | push_nested_class (type, modify) | |
5635 | tree type; | |
5636 | int modify; | |
5637 | { | |
a28e3c7f MS |
5638 | tree context; |
5639 | ||
b262d64c | 5640 | /* A namespace might be passed in error cases, like A::B:C. */ |
07c88314 MM |
5641 | if (type == NULL_TREE |
5642 | || type == error_mark_node | |
b262d64c | 5643 | || TREE_CODE (type) == NAMESPACE_DECL |
07c88314 | 5644 | || ! IS_AGGR_TYPE (type) |
73b0fce8 KL |
5645 | || TREE_CODE (type) == TEMPLATE_TYPE_PARM |
5646 | || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM) | |
a28e3c7f MS |
5647 | return; |
5648 | ||
d2e5ee5c | 5649 | context = DECL_CONTEXT (TYPE_MAIN_DECL (type)); |
8d08fdba | 5650 | |
6b400b21 | 5651 | if (context && CLASS_TYPE_P (context)) |
8d08fdba MS |
5652 | push_nested_class (context, 2); |
5653 | pushclass (type, modify); | |
5654 | } | |
5655 | ||
5656 | /* Undoes a push_nested_class call. MODIFY is passed on to popclass. */ | |
5657 | ||
5658 | void | |
b74a0560 | 5659 | pop_nested_class () |
8d08fdba | 5660 | { |
d2e5ee5c | 5661 | tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
8d08fdba | 5662 | |
b74a0560 | 5663 | popclass (); |
6b400b21 | 5664 | if (context && CLASS_TYPE_P (context)) |
b74a0560 | 5665 | pop_nested_class (); |
8d08fdba MS |
5666 | } |
5667 | ||
5668 | /* Set global variables CURRENT_LANG_NAME to appropriate value | |
5669 | so that behavior of name-mangling machinery is correct. */ | |
5670 | ||
5671 | void | |
5672 | push_lang_context (name) | |
5673 | tree name; | |
5674 | { | |
5675 | *current_lang_stack++ = current_lang_name; | |
9cd64686 MM |
5676 | if (current_lang_stack - &VARRAY_TREE (current_lang_base, 0) |
5677 | >= (ptrdiff_t) VARRAY_SIZE (current_lang_base)) | |
8d08fdba | 5678 | { |
9cd64686 MM |
5679 | size_t old_size = VARRAY_SIZE (current_lang_base); |
5680 | ||
5681 | VARRAY_GROW (current_lang_base, old_size + 10); | |
5682 | current_lang_stack = &VARRAY_TREE (current_lang_base, old_size); | |
8d08fdba MS |
5683 | } |
5684 | ||
e229f2cd | 5685 | if (name == lang_name_cplusplus) |
8d08fdba | 5686 | { |
8d08fdba MS |
5687 | current_lang_name = name; |
5688 | } | |
e229f2cd PB |
5689 | else if (name == lang_name_java) |
5690 | { | |
e229f2cd PB |
5691 | current_lang_name = name; |
5692 | /* DECL_IGNORED_P is initially set for these types, to avoid clutter. | |
5693 | (See record_builtin_java_type in decl.c.) However, that causes | |
5694 | incorrect debug entries if these types are actually used. | |
5695 | So we re-enable debug output after extern "Java". */ | |
e3cd9945 APB |
5696 | DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0; |
5697 | DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0; | |
5698 | DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0; | |
5699 | DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0; | |
5700 | DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0; | |
5701 | DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0; | |
5702 | DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0; | |
5703 | DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0; | |
e229f2cd | 5704 | } |
8d08fdba MS |
5705 | else if (name == lang_name_c) |
5706 | { | |
8d08fdba MS |
5707 | current_lang_name = name; |
5708 | } | |
5709 | else | |
8251199e | 5710 | error ("language string `\"%s\"' not recognized", IDENTIFIER_POINTER (name)); |
8d08fdba MS |
5711 | } |
5712 | ||
5713 | /* Get out of the current language scope. */ | |
e92cc029 | 5714 | |
8d08fdba MS |
5715 | void |
5716 | pop_lang_context () | |
5717 | { | |
9cd64686 MM |
5718 | /* Clear the current entry so that garbage collector won't hold on |
5719 | to it. */ | |
5720 | *current_lang_stack = NULL_TREE; | |
8d08fdba | 5721 | current_lang_name = *--current_lang_stack; |
8d08fdba | 5722 | } |
8d08fdba MS |
5723 | \f |
5724 | /* Type instantiation routines. */ | |
5725 | ||
104bf76a MM |
5726 | /* Given an OVERLOAD and a TARGET_TYPE, return the function that |
5727 | matches the TARGET_TYPE. If there is no satisfactory match, return | |
5728 | error_mark_node, and issue an error message if COMPLAIN is | |
19420d00 NS |
5729 | non-zero. Permit pointers to member function if PTRMEM is non-zero. |
5730 | If TEMPLATE_ONLY, the name of the overloaded function | |
104bf76a MM |
5731 | was a template-id, and EXPLICIT_TARGS are the explicitly provided |
5732 | template arguments. */ | |
5733 | ||
2c73f9f5 | 5734 | static tree |
104bf76a MM |
5735 | resolve_address_of_overloaded_function (target_type, |
5736 | overload, | |
19420d00 NS |
5737 | complain, |
5738 | ptrmem, | |
104bf76a MM |
5739 | template_only, |
5740 | explicit_targs) | |
5741 | tree target_type; | |
5742 | tree overload; | |
2c73f9f5 | 5743 | int complain; |
19420d00 | 5744 | int ptrmem; |
104bf76a MM |
5745 | int template_only; |
5746 | tree explicit_targs; | |
2c73f9f5 | 5747 | { |
104bf76a MM |
5748 | /* Here's what the standard says: |
5749 | ||
5750 | [over.over] | |
5751 | ||
5752 | If the name is a function template, template argument deduction | |
5753 | is done, and if the argument deduction succeeds, the deduced | |
5754 | arguments are used to generate a single template function, which | |
5755 | is added to the set of overloaded functions considered. | |
5756 | ||
5757 | Non-member functions and static member functions match targets of | |
5758 | type "pointer-to-function" or "reference-to-function." Nonstatic | |
5759 | member functions match targets of type "pointer-to-member | |
5760 | function;" the function type of the pointer to member is used to | |
5761 | select the member function from the set of overloaded member | |
5762 | functions. If a nonstatic member function is selected, the | |
5763 | reference to the overloaded function name is required to have the | |
5764 | form of a pointer to member as described in 5.3.1. | |
5765 | ||
5766 | If more than one function is selected, any template functions in | |
5767 | the set are eliminated if the set also contains a non-template | |
5768 | function, and any given template function is eliminated if the | |
5769 | set contains a second template function that is more specialized | |
5770 | than the first according to the partial ordering rules 14.5.5.2. | |
5771 | After such eliminations, if any, there shall remain exactly one | |
5772 | selected function. */ | |
5773 | ||
5774 | int is_ptrmem = 0; | |
5775 | int is_reference = 0; | |
5776 | /* We store the matches in a TREE_LIST rooted here. The functions | |
5777 | are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy | |
5778 | interoperability with most_specialized_instantiation. */ | |
5779 | tree matches = NULL_TREE; | |
50714e79 | 5780 | tree fn; |
104bf76a | 5781 | |
d8f8dca1 MM |
5782 | /* By the time we get here, we should be seeing only real |
5783 | pointer-to-member types, not the internal POINTER_TYPE to | |
5784 | METHOD_TYPE representation. */ | |
5785 | my_friendly_assert (!(TREE_CODE (target_type) == POINTER_TYPE | |
5786 | && (TREE_CODE (TREE_TYPE (target_type)) | |
5787 | == METHOD_TYPE)), 0); | |
104bf76a | 5788 | |
2bdb0643 JM |
5789 | if (TREE_CODE (overload) == COMPONENT_REF) |
5790 | overload = TREE_OPERAND (overload, 1); | |
5791 | ||
104bf76a MM |
5792 | /* Check that the TARGET_TYPE is reasonable. */ |
5793 | if (TYPE_PTRFN_P (target_type)) | |
5794 | /* This is OK. */ | |
5795 | ; | |
5796 | else if (TYPE_PTRMEMFUNC_P (target_type)) | |
5797 | /* This is OK, too. */ | |
5798 | is_ptrmem = 1; | |
5799 | else if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
5800 | { | |
5801 | /* This is OK, too. This comes from a conversion to reference | |
5802 | type. */ | |
5803 | target_type = build_reference_type (target_type); | |
5804 | is_reference = 1; | |
5805 | } | |
5806 | else | |
5807 | { | |
5808 | if (complain) | |
5809 | cp_error("cannot resolve overloaded function `%D' based on conversion to type `%T'", | |
5810 | DECL_NAME (OVL_FUNCTION (overload)), target_type); | |
5811 | return error_mark_node; | |
5812 | } | |
5813 | ||
5814 | /* If we can find a non-template function that matches, we can just | |
5815 | use it. There's no point in generating template instantiations | |
5816 | if we're just going to throw them out anyhow. But, of course, we | |
5817 | can only do this when we don't *need* a template function. */ | |
5818 | if (!template_only) | |
5819 | { | |
5820 | tree fns; | |
5821 | ||
5822 | for (fns = overload; fns; fns = OVL_CHAIN (fns)) | |
5823 | { | |
5824 | tree fn = OVL_FUNCTION (fns); | |
5825 | tree fntype; | |
2c73f9f5 | 5826 | |
104bf76a MM |
5827 | if (TREE_CODE (fn) == TEMPLATE_DECL) |
5828 | /* We're not looking for templates just yet. */ | |
5829 | continue; | |
5830 | ||
5831 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5832 | != is_ptrmem) | |
5833 | /* We're looking for a non-static member, and this isn't | |
5834 | one, or vice versa. */ | |
5835 | continue; | |
5836 | ||
5837 | /* See if there's a match. */ | |
5838 | fntype = TREE_TYPE (fn); | |
5839 | if (is_ptrmem) | |
5840 | fntype = build_ptrmemfunc_type (build_pointer_type (fntype)); | |
5841 | else if (!is_reference) | |
5842 | fntype = build_pointer_type (fntype); | |
5843 | ||
5844 | if (can_convert_arg (target_type, fntype, fn)) | |
e1b3e07d | 5845 | matches = tree_cons (fn, NULL_TREE, matches); |
104bf76a MM |
5846 | } |
5847 | } | |
5848 | ||
5849 | /* Now, if we've already got a match (or matches), there's no need | |
5850 | to proceed to the template functions. But, if we don't have a | |
5851 | match we need to look at them, too. */ | |
5852 | if (!matches) | |
2c73f9f5 | 5853 | { |
104bf76a MM |
5854 | tree target_fn_type; |
5855 | tree target_arg_types; | |
8d3631f8 | 5856 | tree target_ret_type; |
104bf76a MM |
5857 | tree fns; |
5858 | ||
5859 | if (is_ptrmem) | |
4393e105 MM |
5860 | target_fn_type |
5861 | = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type)); | |
2c73f9f5 | 5862 | else |
4393e105 MM |
5863 | target_fn_type = TREE_TYPE (target_type); |
5864 | target_arg_types = TYPE_ARG_TYPES (target_fn_type); | |
8d3631f8 | 5865 | target_ret_type = TREE_TYPE (target_fn_type); |
4393e105 | 5866 | |
104bf76a MM |
5867 | for (fns = overload; fns; fns = OVL_CHAIN (fns)) |
5868 | { | |
5869 | tree fn = OVL_FUNCTION (fns); | |
104bf76a MM |
5870 | tree instantiation; |
5871 | tree instantiation_type; | |
5872 | tree targs; | |
5873 | ||
5874 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
5875 | /* We're only looking for templates. */ | |
5876 | continue; | |
5877 | ||
5878 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5879 | != is_ptrmem) | |
4393e105 | 5880 | /* We're not looking for a non-static member, and this is |
104bf76a MM |
5881 | one, or vice versa. */ |
5882 | continue; | |
5883 | ||
104bf76a | 5884 | /* Try to do argument deduction. */ |
f31c0a32 | 5885 | targs = make_tree_vec (DECL_NTPARMS (fn)); |
4393e105 | 5886 | if (fn_type_unification (fn, explicit_targs, targs, |
8d3631f8 | 5887 | target_arg_types, target_ret_type, |
03017874 | 5888 | DEDUCE_EXACT) != 0) |
104bf76a MM |
5889 | /* Argument deduction failed. */ |
5890 | continue; | |
5891 | ||
5892 | /* Instantiate the template. */ | |
5893 | instantiation = instantiate_template (fn, targs); | |
5894 | if (instantiation == error_mark_node) | |
5895 | /* Instantiation failed. */ | |
5896 | continue; | |
5897 | ||
5898 | /* See if there's a match. */ | |
5899 | instantiation_type = TREE_TYPE (instantiation); | |
5900 | if (is_ptrmem) | |
5901 | instantiation_type = | |
5902 | build_ptrmemfunc_type (build_pointer_type (instantiation_type)); | |
5903 | else if (!is_reference) | |
5904 | instantiation_type = build_pointer_type (instantiation_type); | |
5905 | if (can_convert_arg (target_type, instantiation_type, instantiation)) | |
e1b3e07d | 5906 | matches = tree_cons (instantiation, fn, matches); |
104bf76a MM |
5907 | } |
5908 | ||
5909 | /* Now, remove all but the most specialized of the matches. */ | |
5910 | if (matches) | |
5911 | { | |
5912 | tree match = most_specialized_instantiation (matches, | |
5913 | explicit_targs); | |
5914 | ||
5915 | if (match != error_mark_node) | |
e1b3e07d | 5916 | matches = tree_cons (match, NULL_TREE, NULL_TREE); |
104bf76a MM |
5917 | } |
5918 | } | |
5919 | ||
5920 | /* Now we should have exactly one function in MATCHES. */ | |
5921 | if (matches == NULL_TREE) | |
5922 | { | |
5923 | /* There were *no* matches. */ | |
5924 | if (complain) | |
5925 | { | |
6b9b6b15 | 5926 | cp_error ("no matches converting function `%D' to type `%#T'", |
104bf76a MM |
5927 | DECL_NAME (OVL_FUNCTION (overload)), |
5928 | target_type); | |
6b9b6b15 JM |
5929 | |
5930 | /* print_candidates expects a chain with the functions in | |
5931 | TREE_VALUE slots, so we cons one up here (we're losing anyway, | |
5932 | so why be clever?). */ | |
5933 | for (; overload; overload = OVL_NEXT (overload)) | |
e1b3e07d MM |
5934 | matches = tree_cons (NULL_TREE, OVL_CURRENT (overload), |
5935 | matches); | |
6b9b6b15 JM |
5936 | |
5937 | print_candidates (matches); | |
104bf76a MM |
5938 | } |
5939 | return error_mark_node; | |
2c73f9f5 | 5940 | } |
104bf76a MM |
5941 | else if (TREE_CHAIN (matches)) |
5942 | { | |
5943 | /* There were too many matches. */ | |
5944 | ||
5945 | if (complain) | |
5946 | { | |
5947 | tree match; | |
5948 | ||
5949 | cp_error ("converting overloaded function `%D' to type `%#T' is ambiguous", | |
5950 | DECL_NAME (OVL_FUNCTION (overload)), | |
5951 | target_type); | |
5952 | ||
5953 | /* Since print_candidates expects the functions in the | |
5954 | TREE_VALUE slot, we flip them here. */ | |
5955 | for (match = matches; match; match = TREE_CHAIN (match)) | |
5956 | TREE_VALUE (match) = TREE_PURPOSE (match); | |
5957 | ||
5958 | print_candidates (matches); | |
5959 | } | |
5960 | ||
5961 | return error_mark_node; | |
5962 | } | |
5963 | ||
50714e79 MM |
5964 | /* Good, exactly one match. Now, convert it to the correct type. */ |
5965 | fn = TREE_PURPOSE (matches); | |
5966 | ||
19420d00 NS |
5967 | if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE |
5968 | && !ptrmem && !flag_ms_extensions) | |
5969 | { | |
5970 | if (!complain) | |
5971 | return error_mark_node; | |
5972 | ||
5973 | cp_pedwarn ("assuming pointer to member `%D'", fn); | |
5974 | } | |
a6ecf8b6 JM |
5975 | mark_used (fn); |
5976 | ||
50714e79 MM |
5977 | if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type)) |
5978 | return build_unary_op (ADDR_EXPR, fn, 0); | |
5979 | else | |
5980 | { | |
5981 | /* The target must be a REFERENCE_TYPE. Above, build_unary_op | |
5982 | will mark the function as addressed, but here we must do it | |
5983 | explicitly. */ | |
5984 | mark_addressable (fn); | |
5985 | ||
5986 | return fn; | |
5987 | } | |
2c73f9f5 ML |
5988 | } |
5989 | ||
ec255269 MS |
5990 | /* This function will instantiate the type of the expression given in |
5991 | RHS to match the type of LHSTYPE. If errors exist, then return | |
5e76004e NS |
5992 | error_mark_node. FLAGS is a bit mask. If ITF_COMPLAIN is set, then |
5993 | we complain on errors. If we are not complaining, never modify rhs, | |
5994 | as overload resolution wants to try many possible instantiations, in | |
5995 | the hope that at least one will work. | |
5996 | ||
e6e174e5 JM |
5997 | For non-recursive calls, LHSTYPE should be a function, pointer to |
5998 | function, or a pointer to member function. */ | |
e92cc029 | 5999 | |
8d08fdba | 6000 | tree |
940ff223 | 6001 | instantiate_type (lhstype, rhs, flags) |
8d08fdba | 6002 | tree lhstype, rhs; |
5e76004e | 6003 | enum instantiate_type_flags flags; |
8d08fdba | 6004 | { |
5e76004e NS |
6005 | int complain = (flags & itf_complain); |
6006 | int strict = (flags & itf_no_attributes) | |
6007 | ? COMPARE_NO_ATTRIBUTES : COMPARE_STRICT; | |
19420d00 NS |
6008 | int allow_ptrmem = flags & itf_ptrmem_ok; |
6009 | ||
6010 | flags &= ~itf_ptrmem_ok; | |
105d8e1f | 6011 | |
8d08fdba MS |
6012 | if (TREE_CODE (lhstype) == UNKNOWN_TYPE) |
6013 | { | |
6014 | if (complain) | |
8251199e | 6015 | error ("not enough type information"); |
8d08fdba MS |
6016 | return error_mark_node; |
6017 | } | |
6018 | ||
6019 | if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs))) | |
abff8e06 | 6020 | { |
940ff223 | 6021 | if (comptypes (lhstype, TREE_TYPE (rhs), strict)) |
abff8e06 JM |
6022 | return rhs; |
6023 | if (complain) | |
8251199e | 6024 | cp_error ("argument of type `%T' does not match `%T'", |
abff8e06 JM |
6025 | TREE_TYPE (rhs), lhstype); |
6026 | return error_mark_node; | |
6027 | } | |
8d08fdba | 6028 | |
2c73f9f5 ML |
6029 | /* We don't overwrite rhs if it is an overloaded function. |
6030 | Copying it would destroy the tree link. */ | |
6031 | if (TREE_CODE (rhs) != OVERLOAD) | |
6032 | rhs = copy_node (rhs); | |
c73964b2 | 6033 | |
8d08fdba MS |
6034 | /* This should really only be used when attempting to distinguish |
6035 | what sort of a pointer to function we have. For now, any | |
6036 | arithmetic operation which is not supported on pointers | |
6037 | is rejected as an error. */ | |
6038 | ||
6039 | switch (TREE_CODE (rhs)) | |
6040 | { | |
6041 | case TYPE_EXPR: | |
6042 | case CONVERT_EXPR: | |
6043 | case SAVE_EXPR: | |
6044 | case CONSTRUCTOR: | |
6045 | case BUFFER_REF: | |
6046 | my_friendly_abort (177); | |
6047 | return error_mark_node; | |
6048 | ||
6049 | case INDIRECT_REF: | |
6050 | case ARRAY_REF: | |
ec255269 MS |
6051 | { |
6052 | tree new_rhs; | |
8d08fdba | 6053 | |
ec255269 | 6054 | new_rhs = instantiate_type (build_pointer_type (lhstype), |
940ff223 | 6055 | TREE_OPERAND (rhs, 0), flags); |
ec255269 MS |
6056 | if (new_rhs == error_mark_node) |
6057 | return error_mark_node; | |
6058 | ||
6059 | TREE_TYPE (rhs) = lhstype; | |
6060 | TREE_OPERAND (rhs, 0) = new_rhs; | |
6061 | return rhs; | |
6062 | } | |
8d08fdba MS |
6063 | |
6064 | case NOP_EXPR: | |
6065 | rhs = copy_node (TREE_OPERAND (rhs, 0)); | |
6066 | TREE_TYPE (rhs) = unknown_type_node; | |
940ff223 | 6067 | return instantiate_type (lhstype, rhs, flags); |
8d08fdba MS |
6068 | |
6069 | case COMPONENT_REF: | |
19420d00 | 6070 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba | 6071 | |
2a238a97 | 6072 | case OFFSET_REF: |
05e0b2f4 JM |
6073 | rhs = TREE_OPERAND (rhs, 1); |
6074 | if (BASELINK_P (rhs)) | |
19420d00 NS |
6075 | return instantiate_type (lhstype, TREE_VALUE (rhs), |
6076 | flags | allow_ptrmem); | |
05e0b2f4 | 6077 | |
2a238a97 MM |
6078 | /* This can happen if we are forming a pointer-to-member for a |
6079 | member template. */ | |
2a238a97 | 6080 | my_friendly_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR, 0); |
05e0b2f4 | 6081 | |
2a238a97 | 6082 | /* Fall through. */ |
874503bc | 6083 | |
386b8a85 | 6084 | case TEMPLATE_ID_EXPR: |
2bdb0643 JM |
6085 | { |
6086 | tree fns = TREE_OPERAND (rhs, 0); | |
6087 | tree args = TREE_OPERAND (rhs, 1); | |
6088 | ||
19420d00 | 6089 | return |
2bdb0643 JM |
6090 | resolve_address_of_overloaded_function (lhstype, |
6091 | fns, | |
6092 | complain, | |
19420d00 | 6093 | allow_ptrmem, |
2bdb0643 JM |
6094 | /*template_only=*/1, |
6095 | args); | |
2bdb0643 | 6096 | } |
386b8a85 | 6097 | |
2c73f9f5 | 6098 | case OVERLOAD: |
104bf76a MM |
6099 | return |
6100 | resolve_address_of_overloaded_function (lhstype, | |
6101 | rhs, | |
6102 | complain, | |
19420d00 | 6103 | allow_ptrmem, |
104bf76a MM |
6104 | /*template_only=*/0, |
6105 | /*explicit_targs=*/NULL_TREE); | |
2c73f9f5 ML |
6106 | |
6107 | case TREE_LIST: | |
940ff223 JM |
6108 | /* Now we should have a baselink. */ |
6109 | my_friendly_assert (BASELINK_P (rhs), 990412); | |
e5966228 | 6110 | |
940ff223 | 6111 | return instantiate_type (lhstype, TREE_VALUE (rhs), flags); |
8d08fdba MS |
6112 | |
6113 | case CALL_EXPR: | |
6114 | /* This is too hard for now. */ | |
6115 | my_friendly_abort (183); | |
6116 | return error_mark_node; | |
6117 | ||
6118 | case PLUS_EXPR: | |
6119 | case MINUS_EXPR: | |
6120 | case COMPOUND_EXPR: | |
a0a33927 | 6121 | TREE_OPERAND (rhs, 0) |
940ff223 | 6122 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
8d08fdba MS |
6123 | if (TREE_OPERAND (rhs, 0) == error_mark_node) |
6124 | return error_mark_node; | |
a0a33927 | 6125 | TREE_OPERAND (rhs, 1) |
940ff223 | 6126 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba MS |
6127 | if (TREE_OPERAND (rhs, 1) == error_mark_node) |
6128 | return error_mark_node; | |
6129 | ||
6130 | TREE_TYPE (rhs) = lhstype; | |
6131 | return rhs; | |
6132 | ||
6133 | case MULT_EXPR: | |
6134 | case TRUNC_DIV_EXPR: | |
6135 | case FLOOR_DIV_EXPR: | |
6136 | case CEIL_DIV_EXPR: | |
6137 | case ROUND_DIV_EXPR: | |
6138 | case RDIV_EXPR: | |
6139 | case TRUNC_MOD_EXPR: | |
6140 | case FLOOR_MOD_EXPR: | |
6141 | case CEIL_MOD_EXPR: | |
6142 | case ROUND_MOD_EXPR: | |
6143 | case FIX_ROUND_EXPR: | |
6144 | case FIX_FLOOR_EXPR: | |
6145 | case FIX_CEIL_EXPR: | |
6146 | case FIX_TRUNC_EXPR: | |
6147 | case FLOAT_EXPR: | |
6148 | case NEGATE_EXPR: | |
6149 | case ABS_EXPR: | |
6150 | case MAX_EXPR: | |
6151 | case MIN_EXPR: | |
6152 | case FFS_EXPR: | |
6153 | ||
6154 | case BIT_AND_EXPR: | |
6155 | case BIT_IOR_EXPR: | |
6156 | case BIT_XOR_EXPR: | |
6157 | case LSHIFT_EXPR: | |
6158 | case RSHIFT_EXPR: | |
6159 | case LROTATE_EXPR: | |
6160 | case RROTATE_EXPR: | |
6161 | ||
6162 | case PREINCREMENT_EXPR: | |
6163 | case PREDECREMENT_EXPR: | |
6164 | case POSTINCREMENT_EXPR: | |
6165 | case POSTDECREMENT_EXPR: | |
6166 | if (complain) | |
8251199e | 6167 | error ("invalid operation on uninstantiated type"); |
8d08fdba MS |
6168 | return error_mark_node; |
6169 | ||
6170 | case TRUTH_AND_EXPR: | |
6171 | case TRUTH_OR_EXPR: | |
6172 | case TRUTH_XOR_EXPR: | |
6173 | case LT_EXPR: | |
6174 | case LE_EXPR: | |
6175 | case GT_EXPR: | |
6176 | case GE_EXPR: | |
6177 | case EQ_EXPR: | |
6178 | case NE_EXPR: | |
6179 | case TRUTH_ANDIF_EXPR: | |
6180 | case TRUTH_ORIF_EXPR: | |
6181 | case TRUTH_NOT_EXPR: | |
6182 | if (complain) | |
8251199e | 6183 | error ("not enough type information"); |
8d08fdba MS |
6184 | return error_mark_node; |
6185 | ||
ca36f057 MM |
6186 | case COND_EXPR: |
6187 | if (type_unknown_p (TREE_OPERAND (rhs, 0))) | |
6188 | { | |
6189 | if (complain) | |
6190 | error ("not enough type information"); | |
6191 | return error_mark_node; | |
6192 | } | |
6193 | TREE_OPERAND (rhs, 1) | |
6194 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6195 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6196 | return error_mark_node; | |
6197 | TREE_OPERAND (rhs, 2) | |
6198 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags); | |
6199 | if (TREE_OPERAND (rhs, 2) == error_mark_node) | |
6200 | return error_mark_node; | |
6201 | ||
6202 | TREE_TYPE (rhs) = lhstype; | |
6203 | return rhs; | |
6204 | ||
6205 | case MODIFY_EXPR: | |
6206 | TREE_OPERAND (rhs, 1) | |
6207 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6208 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6209 | return error_mark_node; | |
6210 | ||
6211 | TREE_TYPE (rhs) = lhstype; | |
6212 | return rhs; | |
6213 | ||
6214 | case ADDR_EXPR: | |
19420d00 NS |
6215 | { |
6216 | if (PTRMEM_OK_P (rhs)) | |
6217 | flags |= itf_ptrmem_ok; | |
6218 | ||
ca36f057 | 6219 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
19420d00 | 6220 | } |
ca36f057 MM |
6221 | case ENTRY_VALUE_EXPR: |
6222 | my_friendly_abort (184); | |
6223 | return error_mark_node; | |
6224 | ||
6225 | case ERROR_MARK: | |
6226 | return error_mark_node; | |
6227 | ||
6228 | default: | |
6229 | my_friendly_abort (185); | |
6230 | return error_mark_node; | |
6231 | } | |
6232 | } | |
6233 | \f | |
6234 | /* Return the name of the virtual function pointer field | |
6235 | (as an IDENTIFIER_NODE) for the given TYPE. Note that | |
6236 | this may have to look back through base types to find the | |
6237 | ultimate field name. (For single inheritance, these could | |
6238 | all be the same name. Who knows for multiple inheritance). */ | |
6239 | ||
6240 | static tree | |
6241 | get_vfield_name (type) | |
6242 | tree type; | |
6243 | { | |
6244 | tree binfo = TYPE_BINFO (type); | |
6245 | char *buf; | |
6246 | ||
6247 | while (BINFO_BASETYPES (binfo) | |
6248 | && TYPE_CONTAINS_VPTR_P (BINFO_TYPE (BINFO_BASETYPE (binfo, 0))) | |
6249 | && ! TREE_VIA_VIRTUAL (BINFO_BASETYPE (binfo, 0))) | |
6250 | binfo = BINFO_BASETYPE (binfo, 0); | |
6251 | ||
6252 | type = BINFO_TYPE (binfo); | |
6253 | buf = (char *) alloca (sizeof (VFIELD_NAME_FORMAT) | |
6254 | + TYPE_NAME_LENGTH (type) + 2); | |
6255 | sprintf (buf, VFIELD_NAME_FORMAT, TYPE_NAME_STRING (type)); | |
6256 | return get_identifier (buf); | |
6257 | } | |
6258 | ||
6259 | void | |
6260 | print_class_statistics () | |
6261 | { | |
6262 | #ifdef GATHER_STATISTICS | |
6263 | fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness); | |
6264 | fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs); | |
6265 | fprintf (stderr, "build_method_call = %d (inner = %d)\n", | |
6266 | n_build_method_call, n_inner_fields_searched); | |
6267 | if (n_vtables) | |
6268 | { | |
6269 | fprintf (stderr, "vtables = %d; vtable searches = %d\n", | |
6270 | n_vtables, n_vtable_searches); | |
6271 | fprintf (stderr, "vtable entries = %d; vtable elems = %d\n", | |
6272 | n_vtable_entries, n_vtable_elems); | |
6273 | } | |
6274 | #endif | |
6275 | } | |
6276 | ||
6277 | /* Build a dummy reference to ourselves so Derived::Base (and A::A) works, | |
6278 | according to [class]: | |
6279 | The class-name is also inserted | |
6280 | into the scope of the class itself. For purposes of access checking, | |
6281 | the inserted class name is treated as if it were a public member name. */ | |
6282 | ||
6283 | void | |
6284 | build_self_reference () | |
6285 | { | |
6286 | tree name = constructor_name (current_class_type); | |
6287 | tree value = build_lang_decl (TYPE_DECL, name, current_class_type); | |
6288 | tree saved_cas; | |
6289 | ||
6290 | DECL_NONLOCAL (value) = 1; | |
6291 | DECL_CONTEXT (value) = current_class_type; | |
6292 | DECL_ARTIFICIAL (value) = 1; | |
6293 | ||
6294 | if (processing_template_decl) | |
6295 | value = push_template_decl (value); | |
6296 | ||
6297 | saved_cas = current_access_specifier; | |
6298 | current_access_specifier = access_public_node; | |
6299 | finish_member_declaration (value); | |
6300 | current_access_specifier = saved_cas; | |
6301 | } | |
6302 | ||
6303 | /* Returns 1 if TYPE contains only padding bytes. */ | |
6304 | ||
6305 | int | |
6306 | is_empty_class (type) | |
6307 | tree type; | |
6308 | { | |
6309 | tree t; | |
6310 | ||
6311 | if (type == error_mark_node) | |
6312 | return 0; | |
6313 | ||
6314 | if (! IS_AGGR_TYPE (type)) | |
6315 | return 0; | |
6316 | ||
6317 | if (flag_new_abi) | |
6318 | return integer_zerop (CLASSTYPE_SIZE (type)); | |
6319 | ||
6320 | if (TYPE_BINFO_BASETYPES (type)) | |
6321 | return 0; | |
6322 | t = TYPE_FIELDS (type); | |
6323 | while (t && TREE_CODE (t) != FIELD_DECL) | |
6324 | t = TREE_CHAIN (t); | |
6325 | return (t == NULL_TREE); | |
6326 | } | |
6327 | ||
6328 | /* Find the enclosing class of the given NODE. NODE can be a *_DECL or | |
6329 | a *_TYPE node. NODE can also be a local class. */ | |
6330 | ||
6331 | tree | |
6332 | get_enclosing_class (type) | |
6333 | tree type; | |
6334 | { | |
6335 | tree node = type; | |
6336 | ||
6337 | while (node && TREE_CODE (node) != NAMESPACE_DECL) | |
6338 | { | |
6339 | switch (TREE_CODE_CLASS (TREE_CODE (node))) | |
6340 | { | |
6341 | case 'd': | |
6342 | node = DECL_CONTEXT (node); | |
6343 | break; | |
6344 | ||
6345 | case 't': | |
6346 | if (node != type) | |
6347 | return node; | |
6348 | node = TYPE_CONTEXT (node); | |
6349 | break; | |
6350 | ||
6351 | default: | |
6352 | my_friendly_abort (0); | |
6353 | } | |
6354 | } | |
6355 | return NULL_TREE; | |
6356 | } | |
6357 | ||
6358 | /* Return 1 if TYPE or one of its enclosing classes is derived from BASE. */ | |
6359 | ||
6360 | int | |
6361 | is_base_of_enclosing_class (base, type) | |
6362 | tree base, type; | |
6363 | { | |
6364 | while (type) | |
6365 | { | |
6366 | if (get_binfo (base, type, 0)) | |
6367 | return 1; | |
6368 | ||
6369 | type = get_enclosing_class (type); | |
6370 | } | |
6371 | return 0; | |
6372 | } | |
6373 | ||
6374 | /* Note that NAME was looked up while the current class was being | |
6375 | defined and that the result of that lookup was DECL. */ | |
6376 | ||
6377 | void | |
6378 | maybe_note_name_used_in_class (name, decl) | |
6379 | tree name; | |
6380 | tree decl; | |
6381 | { | |
6382 | splay_tree names_used; | |
6383 | ||
6384 | /* If we're not defining a class, there's nothing to do. */ | |
6385 | if (!current_class_type || !TYPE_BEING_DEFINED (current_class_type)) | |
6386 | return; | |
6387 | ||
6388 | /* If there's already a binding for this NAME, then we don't have | |
6389 | anything to worry about. */ | |
6390 | if (IDENTIFIER_CLASS_VALUE (name)) | |
6391 | return; | |
6392 | ||
6393 | if (!current_class_stack[current_class_depth - 1].names_used) | |
6394 | current_class_stack[current_class_depth - 1].names_used | |
6395 | = splay_tree_new (splay_tree_compare_pointers, 0, 0); | |
6396 | names_used = current_class_stack[current_class_depth - 1].names_used; | |
6397 | ||
6398 | splay_tree_insert (names_used, | |
6399 | (splay_tree_key) name, | |
6400 | (splay_tree_value) decl); | |
6401 | } | |
6402 | ||
6403 | /* Note that NAME was declared (as DECL) in the current class. Check | |
6404 | to see that the declaration is legal. */ | |
6405 | ||
6406 | void | |
6407 | note_name_declared_in_class (name, decl) | |
6408 | tree name; | |
6409 | tree decl; | |
6410 | { | |
6411 | splay_tree names_used; | |
6412 | splay_tree_node n; | |
6413 | ||
6414 | /* Look to see if we ever used this name. */ | |
6415 | names_used | |
6416 | = current_class_stack[current_class_depth - 1].names_used; | |
6417 | if (!names_used) | |
6418 | return; | |
6419 | ||
6420 | n = splay_tree_lookup (names_used, (splay_tree_key) name); | |
6421 | if (n) | |
6422 | { | |
6423 | /* [basic.scope.class] | |
6424 | ||
6425 | A name N used in a class S shall refer to the same declaration | |
6426 | in its context and when re-evaluated in the completed scope of | |
6427 | S. */ | |
6428 | cp_error ("declaration of `%#D'", decl); | |
6429 | cp_error_at ("changes meaning of `%s' from `%+#D'", | |
6430 | IDENTIFIER_POINTER (DECL_NAME (OVL_CURRENT (decl))), | |
6431 | (tree) n->value); | |
6432 | } | |
6433 | } | |
6434 | ||
c35cce41 MM |
6435 | /* Returns the VAR_DECL for the complete vtable associated with |
6436 | BINFO. (Under the new ABI, secondary vtables are merged with | |
6437 | primary vtables; this function will return the VAR_DECL for the | |
6438 | primary vtable.) */ | |
ca36f057 | 6439 | |
c35cce41 MM |
6440 | tree |
6441 | get_vtbl_decl_for_binfo (binfo) | |
6442 | tree binfo; | |
6443 | { | |
6444 | tree decl; | |
6445 | ||
6446 | decl = BINFO_VTABLE (binfo); | |
6447 | if (decl && TREE_CODE (decl) == PLUS_EXPR) | |
6448 | { | |
6449 | my_friendly_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR, | |
6450 | 2000403); | |
6451 | decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0); | |
6452 | } | |
6453 | if (decl) | |
6454 | my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 20000403); | |
6455 | return decl; | |
6456 | } | |
6457 | ||
911a71a7 MM |
6458 | /* Called from get_primary_binfo via dfs_walk. */ |
6459 | ||
6460 | static tree | |
6461 | dfs_get_primary_binfo (binfo, data) | |
6462 | tree binfo; | |
6463 | void *data; | |
6464 | { | |
6465 | tree primary_base = (tree) data; | |
6466 | ||
6467 | if (TREE_VIA_VIRTUAL (binfo) | |
6468 | && same_type_p (TREE_TYPE (binfo), TREE_TYPE (primary_base))) | |
6469 | return binfo; | |
6470 | ||
6471 | return NULL_TREE; | |
6472 | } | |
6473 | ||
6474 | /* Returns the binfo for the primary base of BINFO. Note that in a | |
6475 | complex hierarchy the resulting BINFO may not actually *be* | |
6476 | primary. In particular if the resulting BINFO is a virtual base, | |
6477 | and it occurs elsewhere in the hierarchy, then this occurrence may | |
6478 | not actually be a primary base in the complete object. Check | |
6479 | BINFO_PRIMARY_MARKED_P to be sure. */ | |
6480 | ||
6481 | tree | |
6482 | get_primary_binfo (binfo) | |
6483 | tree binfo; | |
6484 | { | |
6485 | tree primary_base; | |
6486 | tree result; | |
6487 | ||
6488 | primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo)); | |
6489 | if (!primary_base) | |
6490 | return NULL_TREE; | |
6491 | ||
6492 | /* A non-virtual primary base is always a direct base, and easy to | |
6493 | find. */ | |
6494 | if (!TREE_VIA_VIRTUAL (primary_base)) | |
6495 | { | |
6496 | int i; | |
6497 | ||
6498 | /* Scan the direct basetypes until we find a base with the same | |
6499 | type as the primary base. */ | |
6500 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
6501 | { | |
6502 | tree base_binfo = BINFO_BASETYPE (binfo, i); | |
6503 | ||
6504 | if (same_type_p (BINFO_TYPE (base_binfo), | |
6505 | BINFO_TYPE (primary_base))) | |
6506 | return base_binfo; | |
6507 | } | |
6508 | ||
6509 | /* We should always find the primary base. */ | |
6510 | my_friendly_abort (20000729); | |
6511 | } | |
6512 | ||
6513 | /* For a primary virtual base, we have to scan the entire hierarchy | |
6514 | rooted at BINFO; the virtual base could be an indirect virtual | |
6515 | base. */ | |
6516 | result = dfs_walk (binfo, dfs_get_primary_binfo, NULL, primary_base); | |
6517 | my_friendly_assert (result != NULL_TREE, 20000730); | |
6518 | return result; | |
6519 | } | |
6520 | ||
c35cce41 MM |
6521 | /* Dump the offsets of all the bases rooted at BINFO (in the hierarchy |
6522 | dominated by T) to stderr. INDENT should be zero when called from | |
6523 | the top level; it is incremented recursively. */ | |
6524 | ||
6525 | static void | |
6526 | dump_class_hierarchy_r (t, binfo, indent) | |
6527 | tree t; | |
ca36f057 MM |
6528 | tree binfo; |
6529 | int indent; | |
6530 | { | |
6531 | int i; | |
6532 | ||
6533 | fprintf (stderr, "%*s0x%lx (%s) ", indent, "", | |
6534 | (unsigned long) binfo, | |
6535 | type_as_string (binfo, TS_PLAIN)); | |
6536 | fprintf (stderr, HOST_WIDE_INT_PRINT_DEC, | |
6537 | tree_low_cst (BINFO_OFFSET (binfo), 0)); | |
c35cce41 MM |
6538 | if (TREE_VIA_VIRTUAL (binfo)) |
6539 | fprintf (stderr, " virtual"); | |
6540 | if (BINFO_PRIMARY_MARKED_P (binfo) | |
6541 | || (TREE_VIA_VIRTUAL (binfo) | |
911a71a7 MM |
6542 | && BINFO_PRIMARY_MARKED_P (binfo_for_vbase (BINFO_TYPE (binfo), |
6543 | t)))) | |
c35cce41 MM |
6544 | fprintf (stderr, " primary"); |
6545 | fprintf (stderr, "\n"); | |
ca36f057 MM |
6546 | |
6547 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
c35cce41 MM |
6548 | dump_class_hierarchy_r (t, BINFO_BASETYPE (binfo, i), indent + 2); |
6549 | } | |
6550 | ||
6551 | /* Dump the BINFO hierarchy for T. */ | |
6552 | ||
6553 | void | |
6554 | dump_class_hierarchy (t) | |
6555 | tree t; | |
6556 | { | |
c35cce41 | 6557 | dump_class_hierarchy_r (t, TYPE_BINFO (t), 0); |
ca36f057 MM |
6558 | } |
6559 | ||
6560 | /* Virtual function table initialization. */ | |
6561 | ||
6562 | /* Create all the necessary vtables for T and its base classes. */ | |
6563 | ||
6564 | static void | |
6565 | finish_vtbls (t) | |
6566 | tree t; | |
6567 | { | |
6568 | if (merge_primary_and_secondary_vtables_p ()) | |
6569 | { | |
6570 | tree list; | |
6571 | tree vbase; | |
6572 | ||
6573 | /* Under the new ABI, we lay out the primary and secondary | |
6574 | vtables in one contiguous vtable. The primary vtable is | |
6575 | first, followed by the non-virtual secondary vtables in | |
6576 | inheritance graph order. */ | |
c35cce41 | 6577 | list = build_tree_list (TYPE_BINFO_VTABLE (t), NULL_TREE); |
23656158 MM |
6578 | accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), |
6579 | TYPE_BINFO (t), t, list); | |
ca36f057 MM |
6580 | /* Then come the virtual bases, also in inheritance graph |
6581 | order. */ | |
c35cce41 MM |
6582 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) |
6583 | { | |
6584 | if (!TREE_VIA_VIRTUAL (vbase)) | |
6585 | continue; | |
23656158 MM |
6586 | |
6587 | accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list); | |
c35cce41 | 6588 | } |
ca36f057 MM |
6589 | |
6590 | if (TYPE_BINFO_VTABLE (t)) | |
6591 | initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list)); | |
6592 | } | |
6593 | else | |
6594 | { | |
6595 | dfs_walk (TYPE_BINFO (t), dfs_finish_vtbls, | |
6596 | dfs_unmarked_real_bases_queue_p, t); | |
6597 | dfs_walk (TYPE_BINFO (t), dfs_unmark, | |
6598 | dfs_marked_real_bases_queue_p, t); | |
6599 | } | |
6600 | } | |
6601 | ||
6602 | /* Called from finish_vtbls via dfs_walk. */ | |
6603 | ||
6604 | static tree | |
6605 | dfs_finish_vtbls (binfo, data) | |
6606 | tree binfo; | |
6607 | void *data; | |
6608 | { | |
6609 | tree t = (tree) data; | |
6610 | ||
23656158 | 6611 | if (BINFO_NEW_VTABLE_MARKED (binfo, t)) |
ca36f057 | 6612 | initialize_vtable (binfo, |
aabb4cd6 MM |
6613 | build_vtbl_initializer (binfo, binfo, t, |
6614 | TYPE_BINFO (t), NULL)); | |
ca36f057 | 6615 | |
ca36f057 MM |
6616 | SET_BINFO_MARKED (binfo); |
6617 | ||
6618 | return NULL_TREE; | |
6619 | } | |
6620 | ||
6621 | /* Initialize the vtable for BINFO with the INITS. */ | |
6622 | ||
6623 | static void | |
6624 | initialize_vtable (binfo, inits) | |
6625 | tree binfo; | |
6626 | tree inits; | |
6627 | { | |
ca36f057 MM |
6628 | tree decl; |
6629 | ||
6630 | layout_vtable_decl (binfo, list_length (inits)); | |
c35cce41 | 6631 | decl = get_vtbl_decl_for_binfo (binfo); |
23656158 MM |
6632 | initialize_array (decl, inits); |
6633 | } | |
6634 | ||
6635 | /* Initialize DECL (a declaration for a namespace-scope array) with | |
6636 | the INITS. */ | |
6637 | ||
6638 | static void | |
6639 | initialize_array (decl, inits) | |
6640 | tree decl; | |
6641 | tree inits; | |
6642 | { | |
6643 | tree context; | |
6644 | ||
ca36f057 | 6645 | context = DECL_CONTEXT (decl); |
23656158 | 6646 | DECL_CONTEXT (decl) = NULL_TREE; |
ca36f057 MM |
6647 | DECL_INITIAL (decl) = build_nt (CONSTRUCTOR, NULL_TREE, inits); |
6648 | cp_finish_decl (decl, DECL_INITIAL (decl), NULL_TREE, 0); | |
6649 | DECL_CONTEXT (decl) = context; | |
6650 | } | |
6651 | ||
23656158 MM |
6652 | /* Build the VTT (virtual table table) for T. */ |
6653 | ||
6654 | static void | |
6655 | build_vtt (t) | |
6656 | tree t; | |
6657 | { | |
6658 | tree inits; | |
6659 | tree type; | |
6660 | tree vtt; | |
3ec6bad3 | 6661 | tree index; |
23656158 MM |
6662 | |
6663 | /* Under the old ABI, we don't use VTTs. */ | |
6664 | if (!flag_new_abi) | |
6665 | return; | |
6666 | ||
6667 | /* Build up the initializers for the VTT. */ | |
6668 | inits = NULL_TREE; | |
3ec6bad3 | 6669 | index = size_zero_node; |
9ccf6541 MM |
6670 | build_vtt_inits (TYPE_BINFO (t), t, /*virtual_vtts_p=*/1, |
6671 | &inits, &index); | |
23656158 MM |
6672 | |
6673 | /* If we didn't need a VTT, we're done. */ | |
6674 | if (!inits) | |
6675 | return; | |
6676 | ||
6677 | /* Figure out the type of the VTT. */ | |
6678 | type = build_index_type (size_int (list_length (inits))); | |
6679 | type = build_cplus_array_type (const_ptr_type_node, type); | |
6680 | ||
6681 | /* Now, build the VTT object itself. */ | |
669ec2b4 | 6682 | vtt = build_vtable (t, get_vtt_name (t), type); |
23656158 MM |
6683 | pushdecl_top_level (vtt); |
6684 | initialize_array (vtt, inits); | |
6685 | } | |
6686 | ||
9ccf6541 MM |
6687 | /* The type corresponding to BINFO is a base class of T, but BINFO is |
6688 | in the base class hierarchy of a class derived from T. Return the | |
6689 | base, in T's hierarchy, that corresponds to BINFO. */ | |
6690 | ||
6691 | static tree | |
6692 | get_matching_base (binfo, t) | |
6693 | tree binfo; | |
6694 | tree t; | |
6695 | { | |
6696 | tree derived; | |
6697 | int i; | |
6698 | ||
6699 | if (same_type_p (BINFO_TYPE (binfo), t)) | |
6700 | return binfo; | |
6701 | ||
6702 | if (TREE_VIA_VIRTUAL (binfo)) | |
6703 | return binfo_for_vbase (BINFO_TYPE (binfo), t); | |
6704 | ||
6705 | derived = get_matching_base (BINFO_INHERITANCE_CHAIN (binfo), t); | |
6706 | for (i = 0; i < BINFO_N_BASETYPES (derived); ++i) | |
6707 | if (same_type_p (BINFO_TYPE (BINFO_BASETYPE (derived, i)), | |
6708 | BINFO_TYPE (binfo))) | |
6709 | return BINFO_BASETYPE (derived, i); | |
6710 | ||
6711 | my_friendly_abort (20000628); | |
6712 | return NULL_TREE; | |
6713 | } | |
6714 | ||
23656158 | 6715 | /* Recursively build the VTT-initializer for BINFO (which is in the |
9ccf6541 MM |
6716 | hierarchy dominated by T). If VIRTUAL_VTTS_P is non-zero, then |
6717 | sub-VTTs for virtual bases are included. INITS points to the end | |
6718 | of the initializer list to date. INDEX is the VTT index where the | |
6719 | next element will be placed. */ | |
23656158 MM |
6720 | |
6721 | static tree * | |
9ccf6541 | 6722 | build_vtt_inits (binfo, t, virtual_vtts_p, inits, index) |
23656158 MM |
6723 | tree binfo; |
6724 | tree t; | |
9ccf6541 | 6725 | int virtual_vtts_p; |
23656158 | 6726 | tree *inits; |
3ec6bad3 | 6727 | tree *index; |
23656158 MM |
6728 | { |
6729 | int i; | |
6730 | tree b; | |
6731 | tree init; | |
6732 | tree secondary_vptrs; | |
6733 | int ctor_vtbl_p; | |
6734 | ||
6735 | /* We only need VTTs for subobjects with virtual bases. */ | |
6736 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
6737 | return inits; | |
6738 | ||
6739 | /* We need to use a construction vtable if this is not the primary | |
6740 | VTT. */ | |
6741 | ctor_vtbl_p = !same_type_p (TREE_TYPE (binfo), t); | |
6742 | if (ctor_vtbl_p) | |
3ec6bad3 MM |
6743 | { |
6744 | build_ctor_vtbl_group (binfo, t); | |
6745 | ||
6746 | /* Record the offset in the VTT where this sub-VTT can be found. */ | |
6747 | BINFO_SUBVTT_INDEX (binfo) = *index; | |
6748 | } | |
23656158 MM |
6749 | |
6750 | /* Add the address of the primary vtable for the complete object. */ | |
6751 | init = BINFO_VTABLE (binfo); | |
6752 | if (TREE_CODE (init) == TREE_LIST) | |
9ccf6541 | 6753 | init = TREE_VALUE (init); |
23656158 MM |
6754 | *inits = build_tree_list (NULL_TREE, init); |
6755 | inits = &TREE_CHAIN (*inits); | |
3ec6bad3 MM |
6756 | BINFO_VPTR_INDEX (binfo) = *index; |
6757 | *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node)); | |
6758 | ||
23656158 MM |
6759 | /* Recursively add the secondary VTTs for non-virtual bases. */ |
6760 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
6761 | { | |
6762 | b = BINFO_BASETYPE (binfo, i); | |
6763 | if (!TREE_VIA_VIRTUAL (b)) | |
9ccf6541 MM |
6764 | inits = build_vtt_inits (BINFO_BASETYPE (binfo, i), t, |
6765 | /*virtuals_vtts_p=*/0, | |
6766 | inits, index); | |
23656158 | 6767 | } |
3ec6bad3 | 6768 | |
23656158 MM |
6769 | /* Add secondary virtual pointers for all subobjects of BINFO with |
6770 | either virtual bases or virtual functions overridden along a | |
6771 | virtual path between the declaration and D, except subobjects | |
6772 | that are non-virtual primary bases. */ | |
9ccf6541 | 6773 | secondary_vptrs = tree_cons (t, NULL_TREE, BINFO_TYPE (binfo)); |
3ec6bad3 | 6774 | TREE_TYPE (secondary_vptrs) = *index; |
23656158 | 6775 | dfs_walk_real (binfo, |
9ccf6541 | 6776 | dfs_build_secondary_vptr_vtt_inits, |
23656158 MM |
6777 | NULL, |
6778 | dfs_unmarked_real_bases_queue_p, | |
6779 | secondary_vptrs); | |
9ccf6541 | 6780 | dfs_walk (binfo, dfs_unmark, dfs_marked_real_bases_queue_p, t); |
3ec6bad3 | 6781 | *index = TREE_TYPE (secondary_vptrs); |
23656158 MM |
6782 | |
6783 | /* The secondary vptrs come back in reverse order. After we reverse | |
6784 | them, and add the INITS, the last init will be the first element | |
6785 | of the chain. */ | |
6786 | secondary_vptrs = TREE_VALUE (secondary_vptrs); | |
6787 | if (secondary_vptrs) | |
6788 | { | |
6789 | *inits = nreverse (secondary_vptrs); | |
6790 | inits = &TREE_CHAIN (secondary_vptrs); | |
6791 | my_friendly_assert (*inits == NULL_TREE, 20000517); | |
6792 | } | |
6793 | ||
6794 | /* Add the secondary VTTs for virtual bases. */ | |
9ccf6541 MM |
6795 | if (virtual_vtts_p) |
6796 | for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b)) | |
6797 | { | |
6798 | tree vbase; | |
6799 | ||
6800 | if (!TREE_VIA_VIRTUAL (b)) | |
6801 | continue; | |
6802 | ||
6803 | vbase = binfo_for_vbase (BINFO_TYPE (b), t); | |
6804 | inits = build_vtt_inits (vbase, t, /*virtual_vtts_p=*/0, | |
6805 | inits, index); | |
6806 | } | |
23656158 | 6807 | |
9ccf6541 MM |
6808 | dfs_walk (binfo, dfs_fixup_binfo_vtbls, |
6809 | dfs_unmarked_real_bases_queue_p, | |
6810 | build_tree_list (t, binfo)); | |
23656158 MM |
6811 | |
6812 | return inits; | |
6813 | } | |
6814 | ||
6815 | /* Called from build_vtt_inits via dfs_walk. */ | |
6816 | ||
6817 | static tree | |
9ccf6541 | 6818 | dfs_build_secondary_vptr_vtt_inits (binfo, data) |
23656158 MM |
6819 | tree binfo; |
6820 | void *data; | |
6821 | { | |
6822 | tree l; | |
6823 | tree t; | |
6824 | tree init; | |
3ec6bad3 | 6825 | tree index; |
23656158 MM |
6826 | |
6827 | l = (tree) data; | |
9ccf6541 | 6828 | t = TREE_CHAIN (l); |
23656158 MM |
6829 | |
6830 | SET_BINFO_MARKED (binfo); | |
6831 | ||
6832 | /* We don't care about bases that don't have vtables. */ | |
6833 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
6834 | return NULL_TREE; | |
6835 | ||
6836 | /* We're only interested in proper subobjects of T. */ | |
6837 | if (same_type_p (BINFO_TYPE (binfo), t)) | |
6838 | return NULL_TREE; | |
6839 | ||
6840 | /* We're not interested in non-virtual primary bases. */ | |
6841 | if (!TREE_VIA_VIRTUAL (binfo) && BINFO_PRIMARY_MARKED_P (binfo)) | |
6842 | return NULL_TREE; | |
6843 | ||
6844 | /* If BINFO doesn't have virtual bases, then we have to look to see | |
6845 | whether or not any virtual functions were overidden along a | |
db3d8cde MM |
6846 | virtual path. The point is that given: |
6847 | ||
6848 | struct V { virtual void f(); int i; }; | |
9ccf6541 | 6849 | struct C : public virtual V { void f (); }; |
db3d8cde MM |
6850 | |
6851 | when we constrct C we need a secondary vptr for V-in-C because we | |
6852 | don't know what the vcall offset for `f' should be. If `V' ends | |
6853 | up in a different place in the complete object, then we'll need a | |
6854 | different vcall offset than that present in the normal V-in-C | |
6855 | vtable. */ | |
6856 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) | |
9ccf6541 | 6857 | && !BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (get_matching_base (binfo, t))) |
db3d8cde | 6858 | return NULL_TREE; |
23656158 | 6859 | |
3ec6bad3 MM |
6860 | /* Record the index where this secondary vptr can be found. */ |
6861 | index = TREE_TYPE (l); | |
6862 | BINFO_VPTR_INDEX (binfo) = index; | |
6863 | TREE_TYPE (l) = size_binop (PLUS_EXPR, index, | |
6864 | TYPE_SIZE_UNIT (ptr_type_node)); | |
6865 | ||
6866 | /* Add the initializer for the secondary vptr itself. */ | |
23656158 MM |
6867 | init = BINFO_VTABLE (binfo); |
6868 | if (TREE_CODE (init) == TREE_LIST) | |
9ccf6541 | 6869 | init = TREE_VALUE (init); |
23656158 | 6870 | TREE_VALUE (l) = tree_cons (NULL_TREE, init, TREE_VALUE (l)); |
3ec6bad3 | 6871 | |
23656158 MM |
6872 | return NULL_TREE; |
6873 | } | |
6874 | ||
6875 | /* Called from build_vtt_inits via dfs_walk. */ | |
6876 | ||
6877 | static tree | |
6878 | dfs_fixup_binfo_vtbls (binfo, data) | |
6879 | tree binfo; | |
9ccf6541 | 6880 | void *data; |
23656158 MM |
6881 | { |
6882 | CLEAR_BINFO_MARKED (binfo); | |
6883 | ||
6884 | /* We don't care about bases that don't have vtables. */ | |
6885 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
6886 | return NULL_TREE; | |
6887 | ||
6888 | /* If we scribbled the construction vtable vptr into BINFO, clear it | |
6889 | out now. */ | |
9ccf6541 MM |
6890 | if (TREE_CODE (BINFO_VTABLE (binfo)) == TREE_LIST |
6891 | && (TREE_PURPOSE (BINFO_VTABLE (binfo)) | |
6892 | == TREE_VALUE ((tree) data))) | |
6893 | BINFO_VTABLE (binfo) = TREE_CHAIN (BINFO_VTABLE (binfo)); | |
23656158 MM |
6894 | |
6895 | return NULL_TREE; | |
6896 | } | |
6897 | ||
6898 | /* Build the construction vtable group for BINFO which is in the | |
6899 | hierarchy dominated by T. */ | |
6900 | ||
6901 | static void | |
6902 | build_ctor_vtbl_group (binfo, t) | |
6903 | tree binfo; | |
6904 | tree t; | |
6905 | { | |
6906 | tree list; | |
6907 | tree type; | |
6908 | tree vtbl; | |
6909 | tree inits; | |
6910 | tree id; | |
9ccf6541 | 6911 | tree vbase; |
23656158 MM |
6912 | |
6913 | /* See if we've already create this construction vtable group. */ | |
669ec2b4 JM |
6914 | if (flag_new_abi) |
6915 | id = mangle_ctor_vtbl_for_type (t, binfo); | |
6916 | else | |
6917 | id = get_ctor_vtbl_name (t, binfo); | |
23656158 MM |
6918 | if (IDENTIFIER_GLOBAL_VALUE (id)) |
6919 | return; | |
6920 | ||
6921 | /* Build a version of VTBL (with the wrong type) for use in | |
6922 | constructing the addresses of secondary vtables in the | |
6923 | construction vtable group. */ | |
459c43ad | 6924 | vtbl = build_vtable (t, id, ptr_type_node); |
23656158 MM |
6925 | list = build_tree_list (vtbl, NULL_TREE); |
6926 | accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)), | |
6927 | binfo, t, list); | |
9ccf6541 MM |
6928 | for (vbase = TYPE_BINFO (TREE_TYPE (binfo)); |
6929 | vbase; | |
6930 | vbase = TREE_CHAIN (vbase)) | |
6931 | { | |
6932 | tree b; | |
6933 | ||
6934 | if (!TREE_VIA_VIRTUAL (vbase)) | |
6935 | continue; | |
6936 | ||
6937 | b = binfo_for_vbase (BINFO_TYPE (vbase), t); | |
6938 | accumulate_vtbl_inits (b, vbase, binfo, t, list); | |
6939 | } | |
6940 | ||
99389463 | 6941 | inits = TREE_VALUE (list); |
23656158 MM |
6942 | |
6943 | /* Figure out the type of the construction vtable. */ | |
6944 | type = build_index_type (size_int (list_length (inits))); | |
6945 | type = build_cplus_array_type (vtable_entry_type, type); | |
6946 | TREE_TYPE (vtbl) = type; | |
6947 | ||
6948 | /* Initialize the construction vtable. */ | |
6949 | pushdecl_top_level (vtbl); | |
6950 | initialize_array (vtbl, inits); | |
6951 | } | |
6952 | ||
ca36f057 | 6953 | /* Add the vtbl initializers for BINFO (and its non-primary, |
23656158 MM |
6954 | non-virtual bases) to the list of INITS. BINFO is in the hierarchy |
6955 | dominated by T. ORIG_BINFO must have the same type as BINFO, but | |
6956 | may be different from BINFO if we are building a construction | |
6957 | vtable. RTTI_BINFO gives the object that should be used as the | |
6958 | complete object for BINFO. */ | |
ca36f057 MM |
6959 | |
6960 | static void | |
23656158 | 6961 | accumulate_vtbl_inits (binfo, orig_binfo, rtti_binfo, t, inits) |
ca36f057 | 6962 | tree binfo; |
23656158 MM |
6963 | tree orig_binfo; |
6964 | tree rtti_binfo; | |
6965 | tree t; | |
ca36f057 MM |
6966 | tree inits; |
6967 | { | |
23656158 MM |
6968 | int i; |
6969 | int ctor_vtbl_p; | |
6970 | ||
6971 | my_friendly_assert (same_type_p (BINFO_TYPE (binfo), | |
6972 | BINFO_TYPE (orig_binfo)), | |
6973 | 20000517); | |
6974 | ||
6975 | /* This is a construction vtable if the RTTI type is not the most | |
6976 | derived type in the hierarchy. */ | |
6977 | ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
6978 | ||
6979 | /* If we're building a construction vtable, we're not interested in | |
6980 | subobjects that don't require construction vtables. */ | |
6981 | if (ctor_vtbl_p | |
9ccf6541 MM |
6982 | && !TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) |
6983 | && !(BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P | |
6984 | (get_matching_base (binfo, BINFO_TYPE (rtti_binfo))))) | |
23656158 MM |
6985 | return; |
6986 | ||
6987 | /* Build the initializers for the BINFO-in-T vtable. */ | |
6988 | TREE_VALUE (inits) | |
6989 | = chainon (TREE_VALUE (inits), | |
6990 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, | |
6991 | rtti_binfo, t, inits)); | |
6992 | ||
c35cce41 MM |
6993 | /* Walk the BINFO and its bases. We walk in preorder so that as we |
6994 | initialize each vtable we can figure out at what offset the | |
23656158 MM |
6995 | secondary vtable lies from the primary vtable. We can't use |
6996 | dfs_walk here because we need to iterate through bases of BINFO | |
6997 | and RTTI_BINFO simultaneously. */ | |
6998 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
6999 | { | |
7000 | tree base_binfo; | |
7001 | ||
7002 | base_binfo = BINFO_BASETYPE (binfo, i); | |
7003 | /* Skip virtual bases. */ | |
7004 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
7005 | continue; | |
7006 | accumulate_vtbl_inits (base_binfo, | |
7007 | BINFO_BASETYPE (orig_binfo, i), | |
7008 | rtti_binfo, | |
7009 | t, | |
7010 | inits); | |
7011 | } | |
ca36f057 MM |
7012 | } |
7013 | ||
7014 | /* Called from finish_vtbls via dfs_walk when using the new ABI. | |
7015 | Accumulates the vtable initializers for all of the vtables into | |
23656158 | 7016 | TREE_VALUE (DATA). Returns the initializers for the BINFO vtable. */ |
ca36f057 MM |
7017 | |
7018 | static tree | |
23656158 | 7019 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, rtti_binfo, t, l) |
ca36f057 | 7020 | tree binfo; |
23656158 MM |
7021 | tree orig_binfo; |
7022 | tree rtti_binfo; | |
7023 | tree t; | |
7024 | tree l; | |
ca36f057 | 7025 | { |
23656158 | 7026 | tree inits = NULL_TREE; |
ca36f057 | 7027 | |
9ccf6541 | 7028 | if (BINFO_NEW_VTABLE_MARKED (orig_binfo, t)) |
ca36f057 | 7029 | { |
c35cce41 MM |
7030 | tree vtbl; |
7031 | tree index; | |
7032 | int non_fn_entries; | |
7033 | ||
7034 | /* Compute the initializer for this vtable. */ | |
23656158 | 7035 | inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, |
aabb4cd6 | 7036 | &non_fn_entries); |
c35cce41 | 7037 | |
23656158 | 7038 | /* Figure out the position to which the VPTR should point. */ |
c35cce41 MM |
7039 | vtbl = TREE_PURPOSE (l); |
7040 | vtbl = build1 (ADDR_EXPR, | |
23656158 | 7041 | vtbl_ptr_type_node, |
c35cce41 MM |
7042 | vtbl); |
7043 | index = size_binop (PLUS_EXPR, | |
7044 | size_int (non_fn_entries), | |
7045 | size_int (list_length (TREE_VALUE (l)))); | |
23656158 MM |
7046 | index = size_binop (MULT_EXPR, |
7047 | TYPE_SIZE_UNIT (vtable_entry_type), | |
7048 | index); | |
7049 | vtbl = build (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index); | |
7050 | TREE_CONSTANT (vtbl) = 1; | |
7051 | ||
7052 | /* For an ordinary vtable, set BINFO_VTABLE. */ | |
9ccf6541 | 7053 | if (same_type_p (BINFO_TYPE (rtti_binfo), t)) |
23656158 MM |
7054 | BINFO_VTABLE (binfo) = vtbl; |
7055 | /* For a construction vtable, we can't overwrite BINFO_VTABLE. | |
7056 | So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will | |
7057 | straighten this out. */ | |
7058 | else | |
9ccf6541 MM |
7059 | BINFO_VTABLE (binfo) = |
7060 | tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo)); | |
ca36f057 MM |
7061 | } |
7062 | ||
23656158 | 7063 | return inits; |
ca36f057 MM |
7064 | } |
7065 | ||
7066 | /* Construct the initializer for BINFOs virtual function table. BINFO | |
aabb4cd6 | 7067 | is part of the hierarchy dominated by T. If we're building a |
23656158 MM |
7068 | construction vtable, the ORIG_BINFO is the binfo we should use to |
7069 | find the actual function pointers to put in the vtable. Otherwise, | |
911a71a7 | 7070 | ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the |
23656158 MM |
7071 | BINFO that should be indicated by the RTTI information in the |
7072 | vtable; it will be a base class of T, rather than T itself, if we | |
7073 | are building a construction vtable. | |
aabb4cd6 MM |
7074 | |
7075 | The value returned is a TREE_LIST suitable for wrapping in a | |
7076 | CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If | |
7077 | NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the | |
911a71a7 MM |
7078 | number of non-function entries in the vtable. |
7079 | ||
7080 | It might seem that this function should never be called with a | |
7081 | BINFO for which BINFO_PRIMARY_MARKED_P holds, the vtable for such a | |
7082 | base is always subsumed by a derived class vtable. However, when | |
7083 | we are building construction vtables we do build vtables for | |
7084 | primary bases; we need these while the primary base is being | |
7085 | constructed. */ | |
ca36f057 MM |
7086 | |
7087 | static tree | |
23656158 | 7088 | build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, non_fn_entries_p) |
ca36f057 | 7089 | tree binfo; |
23656158 | 7090 | tree orig_binfo; |
ca36f057 | 7091 | tree t; |
aabb4cd6 | 7092 | tree rtti_binfo; |
c35cce41 | 7093 | int *non_fn_entries_p; |
ca36f057 | 7094 | { |
aabb4cd6 | 7095 | tree v; |
911a71a7 | 7096 | tree vfun_inits; |
c35cce41 | 7097 | tree vbase; |
911a71a7 MM |
7098 | vtbl_init_data vid; |
7099 | ||
7100 | /* Initialize VID. */ | |
b485e15b | 7101 | bzero (&vid, sizeof (vid)); |
911a71a7 MM |
7102 | vid.binfo = binfo; |
7103 | vid.derived = t; | |
911a71a7 MM |
7104 | vid.last_init = &vid.inits; |
7105 | vid.primary_vtbl_p = (binfo == TYPE_BINFO (t)); | |
7106 | vid.ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
c35cce41 | 7107 | /* The first vbase or vcall offset is at index -3 in the vtable. */ |
911a71a7 | 7108 | vid.index = ssize_int (-3); |
c35cce41 | 7109 | |
9bab6c90 | 7110 | /* Add entries to the vtable for RTTI. */ |
911a71a7 | 7111 | build_rtti_vtbl_entries (binfo, rtti_binfo, &vid); |
9bab6c90 | 7112 | |
b485e15b MM |
7113 | /* Create an array for keeping track of the functions we've |
7114 | processed. When we see multiple functions with the same | |
7115 | signature, we share the vcall offsets. */ | |
7116 | VARRAY_TREE_INIT (vid.fns, 32, "fns"); | |
c35cce41 | 7117 | /* Add the vcall and vbase offset entries. */ |
911a71a7 | 7118 | build_vcall_and_vbase_vtbl_entries (binfo, &vid); |
b485e15b MM |
7119 | /* Clean up. */ |
7120 | VARRAY_FREE (vid.fns); | |
7121 | /* Clear BINFO_VTABLE_PAATH_MARKED; it's set by | |
c35cce41 MM |
7122 | build_vbase_offset_vtbl_entries. */ |
7123 | for (vbase = CLASSTYPE_VBASECLASSES (t); | |
7124 | vbase; | |
7125 | vbase = TREE_CHAIN (vbase)) | |
a55583e9 | 7126 | CLEAR_BINFO_VTABLE_PATH_MARKED (TREE_VALUE (vbase)); |
ca36f057 | 7127 | |
c35cce41 | 7128 | if (non_fn_entries_p) |
911a71a7 | 7129 | *non_fn_entries_p = list_length (vid.inits); |
ca36f057 MM |
7130 | |
7131 | /* Go through all the ordinary virtual functions, building up | |
7132 | initializers. */ | |
c35cce41 | 7133 | vfun_inits = NULL_TREE; |
23656158 | 7134 | for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v)) |
ca36f057 MM |
7135 | { |
7136 | tree delta; | |
7137 | tree vcall_index; | |
7138 | tree fn; | |
7139 | tree pfn; | |
7140 | tree init; | |
7141 | ||
7142 | /* Pull the offset for `this', and the function to call, out of | |
7143 | the list. */ | |
7144 | delta = BV_DELTA (v); | |
31f8e4f3 MM |
7145 | |
7146 | if (BV_USE_VCALL_INDEX_P (v)) | |
7147 | { | |
7148 | vcall_index = BV_VCALL_INDEX (v); | |
7149 | my_friendly_assert (vcall_index != NULL_TREE, 20000621); | |
7150 | } | |
7151 | else | |
7152 | vcall_index = NULL_TREE; | |
7153 | ||
ca36f057 MM |
7154 | fn = BV_FN (v); |
7155 | my_friendly_assert (TREE_CODE (delta) == INTEGER_CST, 19990727); | |
7156 | my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 19990727); | |
7157 | ||
7158 | /* You can't call an abstract virtual function; it's abstract. | |
7159 | So, we replace these functions with __pure_virtual. */ | |
7160 | if (DECL_PURE_VIRTUAL_P (fn)) | |
7161 | fn = abort_fndecl; | |
7162 | ||
7163 | /* Take the address of the function, considering it to be of an | |
7164 | appropriate generic type. */ | |
7165 | pfn = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); | |
7166 | /* The address of a function can't change. */ | |
7167 | TREE_CONSTANT (pfn) = 1; | |
7168 | /* Enter it in the vtable. */ | |
31f8e4f3 MM |
7169 | init = build_vtable_entry (delta, vcall_index, pfn, |
7170 | BV_GENERATE_THUNK_WITH_VTABLE_P (v)); | |
ca36f057 | 7171 | /* And add it to the chain of initializers. */ |
c35cce41 | 7172 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); |
ca36f057 MM |
7173 | } |
7174 | ||
c35cce41 MM |
7175 | /* The initializers for virtual functions were built up in reverse |
7176 | order; straighten them out now. */ | |
7177 | vfun_inits = nreverse (vfun_inits); | |
7178 | ||
9bab6c90 | 7179 | /* The negative offset initializers are also in reverse order. */ |
911a71a7 | 7180 | vid.inits = nreverse (vid.inits); |
9bab6c90 MM |
7181 | |
7182 | /* Chain the two together. */ | |
911a71a7 | 7183 | return chainon (vid.inits, vfun_inits); |
ca36f057 MM |
7184 | } |
7185 | ||
911a71a7 | 7186 | /* Sets vid->inits to be the initializers for the vbase and vcall |
c35cce41 | 7187 | offsets in BINFO, which is in the hierarchy dominated by T. */ |
ca36f057 | 7188 | |
c35cce41 | 7189 | static void |
911a71a7 | 7190 | build_vcall_and_vbase_vtbl_entries (binfo, vid) |
ca36f057 | 7191 | tree binfo; |
911a71a7 | 7192 | vtbl_init_data *vid; |
ca36f057 | 7193 | { |
c35cce41 | 7194 | tree b; |
8d08fdba | 7195 | |
c35cce41 | 7196 | /* If this is a derived class, we must first create entries |
9bab6c90 | 7197 | corresponding to the primary base class. */ |
911a71a7 | 7198 | b = get_primary_binfo (binfo); |
c35cce41 | 7199 | if (b) |
911a71a7 | 7200 | build_vcall_and_vbase_vtbl_entries (b, vid); |
c35cce41 MM |
7201 | |
7202 | /* Add the vbase entries for this base. */ | |
911a71a7 | 7203 | build_vbase_offset_vtbl_entries (binfo, vid); |
c35cce41 | 7204 | /* Add the vcall entries for this base. */ |
911a71a7 | 7205 | build_vcall_offset_vtbl_entries (binfo, vid); |
ca36f057 | 7206 | } |
8d08fdba | 7207 | |
ca36f057 MM |
7208 | /* Returns the initializers for the vbase offset entries in the vtable |
7209 | for BINFO (which is part of the class hierarchy dominated by T), in | |
c35cce41 MM |
7210 | reverse order. VBASE_OFFSET_INDEX gives the vtable index |
7211 | where the next vbase offset will go. */ | |
8d08fdba | 7212 | |
c35cce41 | 7213 | static void |
911a71a7 | 7214 | build_vbase_offset_vtbl_entries (binfo, vid) |
ca36f057 | 7215 | tree binfo; |
911a71a7 | 7216 | vtbl_init_data *vid; |
ca36f057 | 7217 | { |
c35cce41 MM |
7218 | tree vbase; |
7219 | tree t; | |
8d08fdba | 7220 | |
ca36f057 MM |
7221 | /* Under the old ABI, pointers to virtual bases are stored in each |
7222 | object. */ | |
7223 | if (!vbase_offsets_in_vtable_p ()) | |
c35cce41 | 7224 | return; |
8d08fdba | 7225 | |
ca36f057 MM |
7226 | /* If there are no virtual baseclasses, then there is nothing to |
7227 | do. */ | |
7228 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
c35cce41 | 7229 | return; |
ca36f057 | 7230 | |
911a71a7 | 7231 | t = vid->derived; |
ca36f057 | 7232 | |
c35cce41 MM |
7233 | /* Go through the virtual bases, adding the offsets. */ |
7234 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
7235 | vbase; | |
7236 | vbase = TREE_CHAIN (vbase)) | |
7237 | { | |
7238 | tree b; | |
7239 | tree delta; | |
7240 | ||
7241 | if (!TREE_VIA_VIRTUAL (vbase)) | |
7242 | continue; | |
ca36f057 | 7243 | |
c35cce41 MM |
7244 | /* Find the instance of this virtual base in the complete |
7245 | object. */ | |
a55583e9 | 7246 | b = binfo_for_vbase (BINFO_TYPE (vbase), t); |
c35cce41 MM |
7247 | |
7248 | /* If we've already got an offset for this virtual base, we | |
7249 | don't need another one. */ | |
7250 | if (BINFO_VTABLE_PATH_MARKED (b)) | |
7251 | continue; | |
7252 | SET_BINFO_VTABLE_PATH_MARKED (b); | |
7253 | ||
7254 | /* Figure out where we can find this vbase offset. */ | |
7255 | delta = size_binop (MULT_EXPR, | |
911a71a7 | 7256 | vid->index, |
c35cce41 MM |
7257 | convert (ssizetype, |
7258 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
911a71a7 | 7259 | if (vid->primary_vtbl_p) |
c35cce41 MM |
7260 | BINFO_VPTR_FIELD (b) = delta; |
7261 | ||
7262 | if (binfo != TYPE_BINFO (t)) | |
7263 | { | |
7264 | tree orig_vbase; | |
7265 | ||
7266 | /* Find the instance of this virtual base in the type of BINFO. */ | |
a55583e9 | 7267 | orig_vbase = binfo_for_vbase (BINFO_TYPE (vbase), |
c35cce41 MM |
7268 | BINFO_TYPE (binfo)); |
7269 | ||
7270 | /* The vbase offset had better be the same. */ | |
7271 | if (!tree_int_cst_equal (delta, | |
7272 | BINFO_VPTR_FIELD (orig_vbase))) | |
7273 | my_friendly_abort (20000403); | |
7274 | } | |
7275 | ||
7276 | /* The next vbase will come at a more negative offset. */ | |
911a71a7 | 7277 | vid->index = size_binop (MINUS_EXPR, vid->index, ssize_int (1)); |
c35cce41 MM |
7278 | |
7279 | /* The initializer is the delta from BINFO to this virtual base. | |
4e7512c9 MM |
7280 | The vbase offsets go in reverse inheritance-graph order, and |
7281 | we are walking in inheritance graph order so these end up in | |
7282 | the right order. */ | |
c35cce41 | 7283 | delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (binfo)); |
911a71a7 | 7284 | *vid->last_init |
9bab6c90 MM |
7285 | = build_tree_list (NULL_TREE, |
7286 | fold (build1 (NOP_EXPR, | |
7287 | vtable_entry_type, | |
7288 | delta))); | |
911a71a7 | 7289 | vid->last_init = &TREE_CHAIN (*vid->last_init); |
c35cce41 | 7290 | } |
8d08fdba | 7291 | } |
ca36f057 | 7292 | |
b485e15b MM |
7293 | /* Adds the initializers for the vcall offset entries in the vtable |
7294 | for BINFO (which is part of the class hierarchy dominated by T) to | |
7295 | VID->INITS. */ | |
7296 | ||
7297 | static void | |
7298 | build_vcall_offset_vtbl_entries (binfo, vid) | |
7299 | tree binfo; | |
7300 | vtbl_init_data *vid; | |
7301 | { | |
7302 | /* Under the old ABI, the adjustments to the `this' pointer were made | |
7303 | elsewhere. */ | |
7304 | if (!vcall_offsets_in_vtable_p ()) | |
7305 | return; | |
7306 | ||
7307 | /* We only need these entries if this base is a virtual base. */ | |
7308 | if (!TREE_VIA_VIRTUAL (binfo)) | |
7309 | return; | |
7310 | ||
7311 | /* We need a vcall offset for each of the virtual functions in this | |
7312 | vtable. For example: | |
7313 | ||
7314 | class A { virtual void f (); }; | |
7315 | class B : virtual public A { }; | |
7316 | class C: virtual public A, public B {}; | |
7317 | ||
7318 | Now imagine: | |
7319 | ||
7320 | B* b = new C; | |
7321 | b->f(); | |
7322 | ||
7323 | The location of `A' is not at a fixed offset relative to `B'; the | |
7324 | offset depends on the complete object derived from `B'. So, | |
7325 | `B' vtable contains an entry for `f' that indicates by what | |
7326 | amount the `this' pointer for `B' needs to be adjusted to arrive | |
7327 | at `A'. | |
7328 | ||
7329 | We need entries for all the functions in our primary vtable and | |
7330 | in our non-virtual bases vtables. */ | |
7331 | vid->vbase = binfo; | |
7332 | /* Now, walk through the non-virtual bases, adding vcall offsets. */ | |
7333 | add_vcall_offset_vtbl_entries_r (binfo, vid); | |
7334 | } | |
7335 | ||
7336 | /* Build vcall offsets, starting with those for BINFO. */ | |
7337 | ||
7338 | static void | |
7339 | add_vcall_offset_vtbl_entries_r (binfo, vid) | |
7340 | tree binfo; | |
7341 | vtbl_init_data *vid; | |
7342 | { | |
7343 | int i; | |
7344 | tree primary_binfo; | |
7345 | ||
7346 | /* Don't walk into virtual bases -- except, of course, for the | |
7347 | virtual base for which we are building vcall offsets. */ | |
7348 | if (TREE_VIA_VIRTUAL (binfo) && vid->vbase != binfo) | |
7349 | return; | |
7350 | ||
7351 | /* If BINFO has a primary base, process it first. */ | |
7352 | primary_binfo = get_primary_binfo (binfo); | |
7353 | if (primary_binfo) | |
7354 | add_vcall_offset_vtbl_entries_r (primary_binfo, vid); | |
7355 | ||
7356 | /* Add BINFO itself to the list. */ | |
7357 | add_vcall_offset_vtbl_entries_1 (binfo, vid); | |
7358 | ||
7359 | /* Scan the non-primary bases of BINFO. */ | |
7360 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
7361 | { | |
7362 | tree base_binfo; | |
7363 | ||
7364 | base_binfo = BINFO_BASETYPE (binfo, i); | |
7365 | if (base_binfo != primary_binfo) | |
7366 | add_vcall_offset_vtbl_entries_r (base_binfo, vid); | |
7367 | } | |
7368 | } | |
7369 | ||
ca36f057 | 7370 | /* Called from build_vcall_offset_vtbl_entries via dfs_walk. */ |
e92cc029 | 7371 | |
b485e15b MM |
7372 | static void |
7373 | add_vcall_offset_vtbl_entries_1 (binfo, vid) | |
ca36f057 | 7374 | tree binfo; |
b485e15b | 7375 | vtbl_init_data* vid; |
8d08fdba | 7376 | { |
4e7512c9 MM |
7377 | tree derived_virtuals; |
7378 | tree base_virtuals; | |
b485e15b | 7379 | tree orig_virtuals; |
ca36f057 | 7380 | tree binfo_inits; |
31f8e4f3 MM |
7381 | /* If BINFO is a primary base, this is the least derived class of |
7382 | BINFO that is not a primary base. */ | |
4e7512c9 | 7383 | tree non_primary_binfo; |
ca36f057 | 7384 | |
ca36f057 | 7385 | binfo_inits = NULL_TREE; |
4e7512c9 MM |
7386 | |
7387 | /* We might be a primary base class. Go up the inheritance | |
7388 | hierarchy until we find the class of which we are a primary base: | |
7389 | it is the BINFO_VIRTUALS there that we need to consider. */ | |
7390 | non_primary_binfo = binfo; | |
31f8e4f3 MM |
7391 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) |
7392 | { | |
911a71a7 MM |
7393 | tree b; |
7394 | ||
7395 | /* If we have reached a virtual base, then it must be the | |
7396 | virtual base for which we are building vcall offsets. In | |
7397 | turn, the virtual base must be a (possibly indirect) primary | |
7398 | base of the class that we are initializing, or we wouldn't | |
7399 | care about its vtable offsets. */ | |
7400 | if (TREE_VIA_VIRTUAL (non_primary_binfo)) | |
7401 | { | |
7402 | non_primary_binfo = vid->binfo; | |
7403 | break; | |
7404 | } | |
7405 | ||
7406 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); | |
7407 | if (get_primary_binfo (b) != non_primary_binfo) | |
31f8e4f3 MM |
7408 | break; |
7409 | non_primary_binfo = b; | |
7410 | } | |
4e7512c9 | 7411 | |
c35cce41 | 7412 | /* Make entries for the rest of the virtuals. */ |
b485e15b MM |
7413 | for (base_virtuals = BINFO_VIRTUALS (binfo), |
7414 | derived_virtuals = BINFO_VIRTUALS (non_primary_binfo), | |
7415 | orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
7416 | base_virtuals; | |
7417 | base_virtuals = TREE_CHAIN (base_virtuals), | |
7418 | derived_virtuals = TREE_CHAIN (derived_virtuals), | |
7419 | orig_virtuals = TREE_CHAIN (orig_virtuals)) | |
7420 | { | |
7421 | tree orig_fn; | |
7422 | tree fn; | |
9bab6c90 MM |
7423 | tree base; |
7424 | tree base_binfo; | |
7425 | size_t i; | |
7426 | ||
b485e15b MM |
7427 | /* Find the declaration that originally caused this function to |
7428 | be present. */ | |
7429 | orig_fn = BV_FN (orig_virtuals); | |
7430 | ||
7431 | /* We do not need an entry if this function is declared in a | |
7432 | virtual base (or one of its virtual bases), and not | |
7433 | overridden in the section of the hierarchy dominated by the | |
7434 | virtual base for which we are building vcall offsets. */ | |
7435 | if (!same_type_p (DECL_CONTEXT (orig_fn), BINFO_TYPE (binfo))) | |
7436 | continue; | |
7437 | ||
7438 | /* Find the overriding function. */ | |
7439 | fn = BV_FN (derived_virtuals); | |
7440 | ||
9bab6c90 MM |
7441 | /* If there is already an entry for a function with the same |
7442 | signature as FN, then we do not need a second vcall offset. | |
7443 | Check the list of functions already present in the derived | |
7444 | class vtable. */ | |
911a71a7 | 7445 | for (i = 0; i < VARRAY_ACTIVE_SIZE (vid->fns); ++i) |
9bab6c90 MM |
7446 | { |
7447 | tree derived_entry; | |
7448 | ||
911a71a7 | 7449 | derived_entry = VARRAY_TREE (vid->fns, i); |
31f8e4f3 | 7450 | if (same_signature_p (BV_FN (derived_entry), fn)) |
9bab6c90 MM |
7451 | { |
7452 | BV_VCALL_INDEX (derived_virtuals) | |
7453 | = BV_VCALL_INDEX (derived_entry); | |
7454 | break; | |
7455 | } | |
7456 | } | |
911a71a7 | 7457 | if (i != VARRAY_ACTIVE_SIZE (vid->fns)) |
9bab6c90 MM |
7458 | continue; |
7459 | ||
ca36f057 MM |
7460 | /* The FN comes from BASE. So, we must caculate the adjustment |
7461 | from the virtual base that derived from BINFO to BASE. */ | |
9bab6c90 | 7462 | base = DECL_CONTEXT (fn); |
911a71a7 | 7463 | base_binfo = get_binfo (base, vid->derived, /*protect=*/0); |
ca36f057 | 7464 | |
4e7512c9 | 7465 | /* Compute the vcall offset. */ |
911a71a7 | 7466 | *vid->last_init |
9bab6c90 MM |
7467 | = (build_tree_list |
7468 | (NULL_TREE, | |
7469 | fold (build1 (NOP_EXPR, vtable_entry_type, | |
7470 | size_diffop (BINFO_OFFSET (base_binfo), | |
911a71a7 MM |
7471 | BINFO_OFFSET (vid->vbase)))))); |
7472 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
7473 | ||
4e7512c9 | 7474 | /* Keep track of the vtable index where this vcall offset can be |
911a71a7 MM |
7475 | found. For a construction vtable, we already made this |
7476 | annotation when we build the original vtable. */ | |
7477 | if (!vid->ctor_vtbl_p) | |
7478 | BV_VCALL_INDEX (derived_virtuals) = vid->index; | |
aabb4cd6 | 7479 | |
4e7512c9 MM |
7480 | /* The next vcall offset will be found at a more negative |
7481 | offset. */ | |
911a71a7 | 7482 | vid->index = size_binop (MINUS_EXPR, vid->index, ssize_int (1)); |
4e7512c9 | 7483 | |
9bab6c90 | 7484 | /* Keep track of this function. */ |
911a71a7 | 7485 | VARRAY_PUSH_TREE (vid->fns, derived_virtuals); |
c35cce41 | 7486 | } |
570221c2 | 7487 | } |
b54ccf71 | 7488 | |
ca36f057 | 7489 | /* Return vtbl initializers for the RTTI entries coresponding to the |
aabb4cd6 MM |
7490 | BINFO's vtable. The RTTI entries should indicate the object given |
7491 | by RTTI_BINFO. */ | |
b54ccf71 | 7492 | |
9bab6c90 | 7493 | static void |
911a71a7 | 7494 | build_rtti_vtbl_entries (binfo, rtti_binfo, vid) |
ca36f057 | 7495 | tree binfo; |
aabb4cd6 | 7496 | tree rtti_binfo; |
911a71a7 | 7497 | vtbl_init_data *vid; |
b54ccf71 | 7498 | { |
ca36f057 | 7499 | tree b; |
aabb4cd6 | 7500 | tree t; |
ca36f057 | 7501 | tree basetype; |
ca36f057 MM |
7502 | tree offset; |
7503 | tree decl; | |
7504 | tree init; | |
b54ccf71 | 7505 | |
ca36f057 | 7506 | basetype = BINFO_TYPE (binfo); |
aabb4cd6 | 7507 | t = BINFO_TYPE (rtti_binfo); |
b54ccf71 | 7508 | |
ca36f057 MM |
7509 | /* For a COM object there is no RTTI entry. */ |
7510 | if (CLASSTYPE_COM_INTERFACE (basetype)) | |
9bab6c90 | 7511 | return; |
b54ccf71 | 7512 | |
ca36f057 MM |
7513 | /* To find the complete object, we will first convert to our most |
7514 | primary base, and then add the offset in the vtbl to that value. */ | |
7515 | b = binfo; | |
7516 | while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))) | |
b54ccf71 | 7517 | { |
c35cce41 MM |
7518 | tree primary_base; |
7519 | ||
911a71a7 | 7520 | primary_base = get_primary_binfo (b); |
c35cce41 MM |
7521 | if (!BINFO_PRIMARY_MARKED_P (primary_base)) |
7522 | break; | |
7523 | b = primary_base; | |
b54ccf71 | 7524 | } |
aabb4cd6 | 7525 | offset = size_diffop (BINFO_OFFSET (rtti_binfo), BINFO_OFFSET (b)); |
8f032717 | 7526 | |
ca36f057 MM |
7527 | /* The second entry is, in the case of the new ABI, the address of |
7528 | the typeinfo object, or, in the case of the old ABI, a function | |
7529 | which returns a typeinfo object. */ | |
7530 | if (new_abi_rtti_p ()) | |
7531 | { | |
7532 | if (flag_rtti) | |
7533 | decl = build_unary_op (ADDR_EXPR, get_tinfo_decl (t), 0); | |
7534 | else | |
7535 | decl = integer_zero_node; | |
8f032717 | 7536 | |
ca36f057 MM |
7537 | /* Convert the declaration to a type that can be stored in the |
7538 | vtable. */ | |
7539 | init = build1 (NOP_EXPR, vfunc_ptr_type_node, decl); | |
7540 | TREE_CONSTANT (init) = 1; | |
7541 | } | |
7542 | else | |
7543 | { | |
7544 | if (flag_rtti) | |
7545 | decl = get_tinfo_decl (t); | |
7546 | else | |
7547 | decl = abort_fndecl; | |
8f032717 | 7548 | |
ca36f057 MM |
7549 | /* Convert the declaration to a type that can be stored in the |
7550 | vtable. */ | |
7551 | init = build1 (ADDR_EXPR, vfunc_ptr_type_node, decl); | |
7552 | TREE_CONSTANT (init) = 1; | |
31f8e4f3 MM |
7553 | init = build_vtable_entry (offset, NULL_TREE, init, |
7554 | /*generate_with_vtable_p=*/0); | |
ca36f057 | 7555 | } |
911a71a7 MM |
7556 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7557 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7558 | |
c35cce41 MM |
7559 | /* Add the offset-to-top entry. It comes earlier in the vtable that |
7560 | the the typeinfo entry. */ | |
7561 | if (flag_vtable_thunks) | |
7562 | { | |
7563 | /* Convert the offset to look like a function pointer, so that | |
7564 | we can put it in the vtable. */ | |
7565 | init = build1 (NOP_EXPR, vfunc_ptr_type_node, offset); | |
7566 | TREE_CONSTANT (init) = 1; | |
911a71a7 MM |
7567 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7568 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
c35cce41 | 7569 | } |
8f032717 MM |
7570 | } |
7571 | ||
ca36f057 MM |
7572 | /* Build an entry in the virtual function table. DELTA is the offset |
7573 | for the `this' pointer. VCALL_INDEX is the vtable index containing | |
7574 | the vcall offset; zero if none. ENTRY is the virtual function | |
7575 | table entry itself. It's TREE_TYPE must be VFUNC_PTR_TYPE_NODE, | |
7576 | but it may not actually be a virtual function table pointer. (For | |
7577 | example, it might be the address of the RTTI object, under the new | |
7578 | ABI.) */ | |
8f032717 | 7579 | |
ca36f057 | 7580 | static tree |
31f8e4f3 | 7581 | build_vtable_entry (delta, vcall_index, entry, generate_with_vtable_p) |
ca36f057 MM |
7582 | tree delta; |
7583 | tree vcall_index; | |
7584 | tree entry; | |
31f8e4f3 | 7585 | int generate_with_vtable_p; |
8f032717 | 7586 | { |
ca36f057 | 7587 | if (flag_vtable_thunks) |
8f032717 | 7588 | { |
256309e4 | 7589 | tree fn; |
ca36f057 | 7590 | |
256309e4 | 7591 | fn = TREE_OPERAND (entry, 0); |
31f8e4f3 | 7592 | if ((!integer_zerop (delta) || vcall_index != NULL_TREE) |
256309e4 MM |
7593 | && fn != abort_fndecl |
7594 | && !DECL_TINFO_FN_P (fn)) | |
ca36f057 | 7595 | { |
31f8e4f3 MM |
7596 | entry = make_thunk (entry, delta, vcall_index, |
7597 | generate_with_vtable_p); | |
ca36f057 MM |
7598 | entry = build1 (ADDR_EXPR, vtable_entry_type, entry); |
7599 | TREE_READONLY (entry) = 1; | |
7600 | TREE_CONSTANT (entry) = 1; | |
7601 | } | |
7602 | #ifdef GATHER_STATISTICS | |
7603 | n_vtable_entries += 1; | |
7604 | #endif | |
7605 | return entry; | |
8f032717 | 7606 | } |
ca36f057 MM |
7607 | else |
7608 | { | |
ca36f057 MM |
7609 | tree elems = tree_cons (NULL_TREE, delta, |
7610 | tree_cons (NULL_TREE, integer_zero_node, | |
7611 | build_tree_list (NULL_TREE, entry))); | |
7612 | tree entry = build (CONSTRUCTOR, vtable_entry_type, NULL_TREE, elems); | |
4a314e0c | 7613 | |
ca36f057 | 7614 | /* We don't use vcall offsets when not using vtable thunks. */ |
31f8e4f3 | 7615 | my_friendly_assert (vcall_index == NULL_TREE, 20000125); |
4a314e0c | 7616 | |
ca36f057 MM |
7617 | /* DELTA used to be constructed by `size_int' and/or size_binop, |
7618 | which caused overflow problems when it was negative. That should | |
7619 | be fixed now. */ | |
4a314e0c | 7620 | |
ca36f057 MM |
7621 | if (! int_fits_type_p (delta, delta_type_node)) |
7622 | { | |
7623 | if (flag_huge_objects) | |
7624 | sorry ("object size exceeds built-in limit for virtual function table implementation"); | |
7625 | else | |
7626 | sorry ("object size exceeds normal limit for virtual function table implementation, recompile all source and use -fhuge-objects"); | |
7627 | } | |
7628 | ||
7629 | TREE_CONSTANT (entry) = 1; | |
7630 | TREE_STATIC (entry) = 1; | |
7631 | TREE_READONLY (entry) = 1; | |
4a314e0c | 7632 | |
ca36f057 MM |
7633 | #ifdef GATHER_STATISTICS |
7634 | n_vtable_entries += 1; | |
7635 | #endif | |
7636 | ||
7637 | return entry; | |
7638 | } | |
4a314e0c | 7639 | } |