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8d08fdba MS |
1 | /* Breadth-first and depth-first routines for |
2 | searching multiple-inheritance lattice for GNU C++. | |
99dee823 | 3 | Copyright (C) 1987-2021 Free Software Foundation, Inc. |
8d08fdba MS |
4 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
5 | ||
f5adbb8d | 6 | This file is part of GCC. |
8d08fdba | 7 | |
f5adbb8d | 8 | GCC is free software; you can redistribute it and/or modify |
8d08fdba | 9 | it under the terms of the GNU General Public License as published by |
e77f031d | 10 | the Free Software Foundation; either version 3, or (at your option) |
8d08fdba MS |
11 | any later version. |
12 | ||
f5adbb8d | 13 | GCC is distributed in the hope that it will be useful, |
8d08fdba MS |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
e77f031d NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
8d08fdba | 21 | |
e92cc029 | 22 | /* High-level class interface. */ |
8d08fdba MS |
23 | |
24 | #include "config.h" | |
8d052bc7 | 25 | #include "system.h" |
4977bab6 | 26 | #include "coretypes.h" |
8d08fdba | 27 | #include "cp-tree.h" |
f25a2b52 | 28 | #include "intl.h" |
54f92bfb | 29 | #include "toplev.h" |
6a3f203c | 30 | #include "spellcheck-tree.h" |
314e6352 ML |
31 | #include "stringpool.h" |
32 | #include "attribs.h" | |
8d08fdba | 33 | |
f8ad2d21 | 34 | static int is_subobject_of_p (tree, tree); |
2c2e8978 | 35 | static tree dfs_lookup_base (tree, void *); |
6936e493 NS |
36 | static tree dfs_dcast_hint_pre (tree, void *); |
37 | static tree dfs_dcast_hint_post (tree, void *); | |
86ac0575 | 38 | static tree dfs_debug_mark (tree, void *); |
8f2a734f NS |
39 | static int check_hidden_convs (tree, int, int, tree, tree, tree); |
40 | static tree split_conversions (tree, tree, tree, tree); | |
2e12a855 | 41 | static int lookup_conversions_r (tree, int, int, tree, tree, tree *); |
86ac0575 | 42 | static int look_for_overrides_r (tree, tree); |
86ac0575 | 43 | static tree lookup_field_r (tree, void *); |
6936e493 | 44 | static tree dfs_accessible_post (tree, void *); |
6936e493 NS |
45 | static tree dfs_walk_once_accessible (tree, bool, |
46 | tree (*pre_fn) (tree, void *), | |
47 | tree (*post_fn) (tree, void *), | |
48 | void *data); | |
86ac0575 NS |
49 | static tree dfs_access_in_type (tree, void *); |
50 | static access_kind access_in_type (tree, tree); | |
86ac0575 | 51 | static tree dfs_get_pure_virtuals (tree, void *); |
8d08fdba | 52 | |
8d08fdba | 53 | \f |
2c2e8978 NS |
54 | /* Data for lookup_base and its workers. */ |
55 | ||
56 | struct lookup_base_data_s | |
338d90b8 | 57 | { |
03fd3f84 | 58 | tree t; /* type being searched. */ |
0cbd7506 MS |
59 | tree base; /* The base type we're looking for. */ |
60 | tree binfo; /* Found binfo. */ | |
61 | bool via_virtual; /* Found via a virtual path. */ | |
2c2e8978 | 62 | bool ambiguous; /* Found multiply ambiguous */ |
0cbd7506 | 63 | bool repeated_base; /* Whether there are repeated bases in the |
2c2e8978 | 64 | hierarchy. */ |
0cbd7506 | 65 | bool want_any; /* Whether we want any matching binfo. */ |
2c2e8978 NS |
66 | }; |
67 | ||
68 | /* Worker function for lookup_base. See if we've found the desired | |
f0ec2b9a | 69 | base and update DATA_ (a pointer to LOOKUP_BASE_DATA_S). */ |
338d90b8 | 70 | |
2c2e8978 NS |
71 | static tree |
72 | dfs_lookup_base (tree binfo, void *data_) | |
73 | { | |
67f5655f | 74 | struct lookup_base_data_s *data = (struct lookup_base_data_s *) data_; |
338d90b8 | 75 | |
2c2e8978 NS |
76 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->base)) |
77 | { | |
78 | if (!data->binfo) | |
338d90b8 | 79 | { |
2c2e8978 NS |
80 | data->binfo = binfo; |
81 | data->via_virtual | |
82 | = binfo_via_virtual (data->binfo, data->t) != NULL_TREE; | |
c8094d83 | 83 | |
2c2e8978 NS |
84 | if (!data->repeated_base) |
85 | /* If there are no repeated bases, we can stop now. */ | |
86 | return binfo; | |
c8094d83 | 87 | |
2c2e8978 NS |
88 | if (data->want_any && !data->via_virtual) |
89 | /* If this is a non-virtual base, then we can't do | |
90 | better. */ | |
91 | return binfo; | |
c8094d83 | 92 | |
2c2e8978 NS |
93 | return dfs_skip_bases; |
94 | } | |
95 | else | |
96 | { | |
97 | gcc_assert (binfo != data->binfo); | |
c8094d83 | 98 | |
2c2e8978 NS |
99 | /* We've found more than one matching binfo. */ |
100 | if (!data->want_any) | |
101 | { | |
102 | /* This is immediately ambiguous. */ | |
103 | data->binfo = NULL_TREE; | |
104 | data->ambiguous = true; | |
105 | return error_mark_node; | |
106 | } | |
107 | ||
108 | /* Prefer one via a non-virtual path. */ | |
109 | if (!binfo_via_virtual (binfo, data->t)) | |
110 | { | |
111 | data->binfo = binfo; | |
112 | data->via_virtual = false; | |
113 | return binfo; | |
114 | } | |
127b8136 | 115 | |
2c2e8978 NS |
116 | /* There must be repeated bases, otherwise we'd have stopped |
117 | on the first base we found. */ | |
118 | return dfs_skip_bases; | |
338d90b8 NS |
119 | } |
120 | } | |
c8094d83 | 121 | |
2c2e8978 | 122 | return NULL_TREE; |
338d90b8 NS |
123 | } |
124 | ||
7e0f147a AS |
125 | /* This deals with bug PR17314. |
126 | ||
127 | DECL is a declaration and BINFO represents a class that has attempted (but | |
128 | failed) to access DECL. | |
129 | ||
130 | Examine the parent binfos of BINFO and determine whether any of them had | |
131 | private access to DECL. If they did, return the parent binfo. This helps | |
132 | in figuring out the correct error message to show (if the parents had | |
133 | access, it's their fault for not giving sufficient access to BINFO). | |
134 | ||
135 | If no parents had access, return NULL_TREE. */ | |
136 | ||
137 | tree | |
138 | get_parent_with_private_access (tree decl, tree binfo) | |
139 | { | |
140 | /* Only BINFOs should come through here. */ | |
141 | gcc_assert (TREE_CODE (binfo) == TREE_BINFO); | |
142 | ||
143 | tree base_binfo = NULL_TREE; | |
144 | ||
145 | /* Iterate through immediate parent classes. */ | |
146 | for (int i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
147 | { | |
148 | /* This parent had private access. Therefore that's why BINFO can't | |
149 | access DECL. */ | |
150 | if (access_in_type (BINFO_TYPE (base_binfo), decl) == ak_private) | |
151 | return base_binfo; | |
152 | } | |
153 | ||
154 | /* None of the parents had access. Note: it's impossible for one of the | |
155 | parents to have had public or protected access to DECL, since then | |
156 | BINFO would have been able to access DECL too. */ | |
157 | return NULL_TREE; | |
158 | } | |
159 | ||
bd16cb25 | 160 | /* Returns true if type BASE is accessible in T. (BASE is known to be |
18e4be85 NS |
161 | a (possibly non-proper) base class of T.) If CONSIDER_LOCAL_P is |
162 | true, consider any special access of the current scope, or access | |
163 | bestowed by friendship. */ | |
bd16cb25 MM |
164 | |
165 | bool | |
18e4be85 | 166 | accessible_base_p (tree t, tree base, bool consider_local_p) |
bd16cb25 MM |
167 | { |
168 | tree decl; | |
169 | ||
170 | /* [class.access.base] | |
171 | ||
172 | A base class is said to be accessible if an invented public | |
c8094d83 | 173 | member of the base class is accessible. |
26bcf8fc MM |
174 | |
175 | If BASE is a non-proper base, this condition is trivially | |
176 | true. */ | |
177 | if (same_type_p (t, base)) | |
178 | return true; | |
bd16cb25 MM |
179 | /* Rather than inventing a public member, we use the implicit |
180 | public typedef created in the scope of every class. */ | |
181 | decl = TYPE_FIELDS (base); | |
182 | while (!DECL_SELF_REFERENCE_P (decl)) | |
910ad8de | 183 | decl = DECL_CHAIN (decl); |
bd16cb25 MM |
184 | while (ANON_AGGR_TYPE_P (t)) |
185 | t = TYPE_CONTEXT (t); | |
18e4be85 | 186 | return accessible_p (t, decl, consider_local_p); |
bd16cb25 MM |
187 | } |
188 | ||
338d90b8 | 189 | /* Lookup BASE in the hierarchy dominated by T. Do access checking as |
dbbf88d1 NS |
190 | ACCESS specifies. Return the binfo we discover. If KIND_PTR is |
191 | non-NULL, fill with information about what kind of base we | |
192 | discovered. | |
338d90b8 | 193 | |
22854930 PC |
194 | If the base is inaccessible, or ambiguous, then error_mark_node is |
195 | returned. If the tf_error bit of COMPLAIN is not set, no error | |
196 | is issued. */ | |
338d90b8 NS |
197 | |
198 | tree | |
22854930 PC |
199 | lookup_base (tree t, tree base, base_access access, |
200 | base_kind *kind_ptr, tsubst_flags_t complain) | |
338d90b8 | 201 | { |
2c2e8978 NS |
202 | tree binfo; |
203 | tree t_binfo; | |
338d90b8 | 204 | base_kind bk; |
c8094d83 | 205 | |
ca2e264d JM |
206 | /* "Nothing" is definitely not derived from Base. */ |
207 | if (t == NULL_TREE) | |
208 | { | |
209 | if (kind_ptr) | |
210 | *kind_ptr = bk_not_base; | |
211 | return NULL_TREE; | |
212 | } | |
213 | ||
338d90b8 NS |
214 | if (t == error_mark_node || base == error_mark_node) |
215 | { | |
216 | if (kind_ptr) | |
217 | *kind_ptr = bk_not_base; | |
218 | return error_mark_node; | |
219 | } | |
50bc768d | 220 | gcc_assert (TYPE_P (base)); |
c8094d83 | 221 | |
4ba126e4 MM |
222 | if (!TYPE_P (t)) |
223 | { | |
224 | t_binfo = t; | |
225 | t = BINFO_TYPE (t); | |
226 | } | |
2c2e8978 | 227 | else |
cad7e87b NS |
228 | { |
229 | t = complete_type (TYPE_MAIN_VARIANT (t)); | |
d9338471 JM |
230 | if (dependent_type_p (t)) |
231 | if (tree open = currently_open_class (t)) | |
232 | t = open; | |
cad7e87b NS |
233 | t_binfo = TYPE_BINFO (t); |
234 | } | |
c8094d83 | 235 | |
f4ecc8fd | 236 | base = TYPE_MAIN_VARIANT (base); |
cad7e87b | 237 | |
f4ecc8fd JM |
238 | /* If BASE is incomplete, it can't be a base of T--and instantiating it |
239 | might cause an error. */ | |
01628e54 | 240 | if (t_binfo && CLASS_TYPE_P (base) && COMPLETE_OR_OPEN_TYPE_P (base)) |
2c2e8978 NS |
241 | { |
242 | struct lookup_base_data_s data; | |
243 | ||
244 | data.t = t; | |
245 | data.base = base; | |
246 | data.binfo = NULL_TREE; | |
247 | data.ambiguous = data.via_virtual = false; | |
248 | data.repeated_base = CLASSTYPE_REPEATED_BASE_P (t); | |
249 | data.want_any = access == ba_any; | |
250 | ||
251 | dfs_walk_once (t_binfo, dfs_lookup_base, NULL, &data); | |
252 | binfo = data.binfo; | |
c8094d83 | 253 | |
2c2e8978 NS |
254 | if (!binfo) |
255 | bk = data.ambiguous ? bk_ambig : bk_not_base; | |
256 | else if (binfo == t_binfo) | |
257 | bk = bk_same_type; | |
258 | else if (data.via_virtual) | |
259 | bk = bk_via_virtual; | |
260 | else | |
261 | bk = bk_proper_base; | |
262 | } | |
cad7e87b | 263 | else |
2c2e8978 NS |
264 | { |
265 | binfo = NULL_TREE; | |
266 | bk = bk_not_base; | |
267 | } | |
338d90b8 | 268 | |
e80706c4 MM |
269 | /* Check that the base is unambiguous and accessible. */ |
270 | if (access != ba_any) | |
271 | switch (bk) | |
272 | { | |
273 | case bk_not_base: | |
274 | break; | |
275 | ||
276 | case bk_ambig: | |
22854930 PC |
277 | if (complain & tf_error) |
278 | error ("%qT is an ambiguous base of %qT", base, t); | |
279 | binfo = error_mark_node; | |
e80706c4 MM |
280 | break; |
281 | ||
282 | default: | |
18e4be85 | 283 | if ((access & ba_check_bit) |
e80706c4 MM |
284 | /* If BASE is incomplete, then BASE and TYPE are probably |
285 | the same, in which case BASE is accessible. If they | |
286 | are not the same, then TYPE is invalid. In that case, | |
287 | there's no need to issue another error here, and | |
288 | there's no implicit typedef to use in the code that | |
289 | follows, so we skip the check. */ | |
bd16cb25 | 290 | && COMPLETE_TYPE_P (base) |
18e4be85 | 291 | && !accessible_base_p (t, base, !(access & ba_ignore_scope))) |
e80706c4 | 292 | { |
22854930 PC |
293 | if (complain & tf_error) |
294 | error ("%qT is an inaccessible base of %qT", base, t); | |
295 | binfo = error_mark_node; | |
bd16cb25 | 296 | bk = bk_inaccessible; |
e80706c4 MM |
297 | } |
298 | break; | |
299 | } | |
300 | ||
338d90b8 NS |
301 | if (kind_ptr) |
302 | *kind_ptr = bk; | |
c8094d83 | 303 | |
338d90b8 NS |
304 | return binfo; |
305 | } | |
306 | ||
6936e493 | 307 | /* Data for dcast_base_hint walker. */ |
4a9e5c67 | 308 | |
6936e493 | 309 | struct dcast_data_s |
4a9e5c67 | 310 | { |
6936e493 NS |
311 | tree subtype; /* The base type we're looking for. */ |
312 | int virt_depth; /* Number of virtual bases encountered from most | |
313 | derived. */ | |
314 | tree offset; /* Best hint offset discovered so far. */ | |
315 | bool repeated_base; /* Whether there are repeated bases in the | |
d740dbe7 | 316 | hierarchy. */ |
6936e493 NS |
317 | }; |
318 | ||
319 | /* Worker for dcast_base_hint. Search for the base type being cast | |
320 | from. */ | |
321 | ||
322 | static tree | |
323 | dfs_dcast_hint_pre (tree binfo, void *data_) | |
324 | { | |
67f5655f | 325 | struct dcast_data_s *data = (struct dcast_data_s *) data_; |
6936e493 NS |
326 | |
327 | if (BINFO_VIRTUAL_P (binfo)) | |
328 | data->virt_depth++; | |
c8094d83 | 329 | |
6936e493 | 330 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->subtype)) |
4a9e5c67 | 331 | { |
6936e493 NS |
332 | if (data->virt_depth) |
333 | { | |
334 | data->offset = ssize_int (-1); | |
335 | return data->offset; | |
336 | } | |
337 | if (data->offset) | |
338 | data->offset = ssize_int (-3); | |
4a9e5c67 | 339 | else |
6936e493 NS |
340 | data->offset = BINFO_OFFSET (binfo); |
341 | ||
342 | return data->repeated_base ? dfs_skip_bases : data->offset; | |
4a9e5c67 | 343 | } |
6936e493 NS |
344 | |
345 | return NULL_TREE; | |
346 | } | |
347 | ||
348 | /* Worker for dcast_base_hint. Track the virtual depth. */ | |
349 | ||
350 | static tree | |
351 | dfs_dcast_hint_post (tree binfo, void *data_) | |
352 | { | |
67f5655f | 353 | struct dcast_data_s *data = (struct dcast_data_s *) data_; |
6936e493 NS |
354 | |
355 | if (BINFO_VIRTUAL_P (binfo)) | |
356 | data->virt_depth--; | |
357 | ||
358 | return NULL_TREE; | |
4a9e5c67 NS |
359 | } |
360 | ||
f08dda39 NS |
361 | /* The dynamic cast runtime needs a hint about how the static SUBTYPE type |
362 | started from is related to the required TARGET type, in order to optimize | |
306ef644 | 363 | the inheritance graph search. This information is independent of the |
4a9e5c67 NS |
364 | current context, and ignores private paths, hence get_base_distance is |
365 | inappropriate. Return a TREE specifying the base offset, BOFF. | |
366 | BOFF >= 0, there is only one public non-virtual SUBTYPE base at offset BOFF, | |
367 | and there are no public virtual SUBTYPE bases. | |
f08dda39 NS |
368 | BOFF == -1, SUBTYPE occurs as multiple public virtual or non-virtual bases. |
369 | BOFF == -2, SUBTYPE is not a public base. | |
370 | BOFF == -3, SUBTYPE occurs as multiple public non-virtual bases. */ | |
4a9e5c67 NS |
371 | |
372 | tree | |
6936e493 | 373 | dcast_base_hint (tree subtype, tree target) |
4a9e5c67 | 374 | { |
6936e493 NS |
375 | struct dcast_data_s data; |
376 | ||
377 | data.subtype = subtype; | |
378 | data.virt_depth = 0; | |
379 | data.offset = NULL_TREE; | |
380 | data.repeated_base = CLASSTYPE_REPEATED_BASE_P (target); | |
c8094d83 | 381 | |
6936e493 NS |
382 | dfs_walk_once_accessible (TYPE_BINFO (target), /*friends=*/false, |
383 | dfs_dcast_hint_pre, dfs_dcast_hint_post, &data); | |
384 | return data.offset ? data.offset : ssize_int (-2); | |
4a9e5c67 NS |
385 | } |
386 | ||
c717c5af MM |
387 | /* Search for a member with name NAME in a multiple inheritance |
388 | lattice specified by TYPE. If it does not exist, return NULL_TREE. | |
8d08fdba | 389 | If the member is ambiguously referenced, return `error_mark_node'. |
c717c5af MM |
390 | Otherwise, return a DECL with the indicated name. If WANT_TYPE is |
391 | true, type declarations are preferred. */ | |
8d08fdba | 392 | |
a5201a91 | 393 | /* Return the FUNCTION_DECL, RECORD_TYPE, UNION_TYPE, or |
c8094d83 | 394 | NAMESPACE_DECL corresponding to the innermost non-block scope. */ |
a5201a91 MM |
395 | |
396 | tree | |
6ac1920d | 397 | current_scope (void) |
a5201a91 MM |
398 | { |
399 | /* There are a number of cases we need to be aware of here: | |
7177d104 | 400 | current_class_type current_function_decl |
e92cc029 MS |
401 | global NULL NULL |
402 | fn-local NULL SET | |
403 | class-local SET NULL | |
404 | class->fn SET SET | |
405 | fn->class SET SET | |
7177d104 | 406 | |
a5201a91 MM |
407 | Those last two make life interesting. If we're in a function which is |
408 | itself inside a class, we need decls to go into the fn's decls (our | |
409 | second case below). But if we're in a class and the class itself is | |
410 | inside a function, we need decls to go into the decls for the class. To | |
411 | achieve this last goal, we must see if, when both current_class_ptr and | |
412 | current_function_decl are set, the class was declared inside that | |
413 | function. If so, we know to put the decls into the class's scope. */ | |
414 | if (current_function_decl && current_class_type | |
415 | && ((DECL_FUNCTION_MEMBER_P (current_function_decl) | |
416 | && same_type_p (DECL_CONTEXT (current_function_decl), | |
417 | current_class_type)) | |
418 | || (DECL_FRIEND_CONTEXT (current_function_decl) | |
419 | && same_type_p (DECL_FRIEND_CONTEXT (current_function_decl), | |
420 | current_class_type)))) | |
8d08fdba | 421 | return current_function_decl; |
e9888922 | 422 | |
a5201a91 MM |
423 | if (current_class_type) |
424 | return current_class_type; | |
e9888922 | 425 | |
a5201a91 | 426 | if (current_function_decl) |
8d08fdba | 427 | return current_function_decl; |
e9888922 | 428 | |
a5201a91 | 429 | return current_namespace; |
8d08fdba MS |
430 | } |
431 | ||
838dfd8a | 432 | /* Returns nonzero if we are currently in a function scope. Note |
9188c363 MM |
433 | that this function returns zero if we are within a local class, but |
434 | not within a member function body of the local class. */ | |
435 | ||
436 | int | |
edaf3e03 | 437 | at_function_scope_p (void) |
9188c363 MM |
438 | { |
439 | tree cs = current_scope (); | |
ef2361a9 JM |
440 | /* Also check cfun to make sure that we're really compiling |
441 | this function (as opposed to having set current_function_decl | |
442 | for access checking or some such). */ | |
443 | return (cs && TREE_CODE (cs) == FUNCTION_DECL | |
444 | && cfun && cfun->decl == current_function_decl); | |
9188c363 MM |
445 | } |
446 | ||
5f261ba9 MM |
447 | /* Returns true if the innermost active scope is a class scope. */ |
448 | ||
449 | bool | |
edaf3e03 | 450 | at_class_scope_p (void) |
5f261ba9 MM |
451 | { |
452 | tree cs = current_scope (); | |
453 | return cs && TYPE_P (cs); | |
454 | } | |
455 | ||
afb0918a MM |
456 | /* Returns true if the innermost active scope is a namespace scope. */ |
457 | ||
458 | bool | |
459 | at_namespace_scope_p (void) | |
460 | { | |
a5201a91 MM |
461 | tree cs = current_scope (); |
462 | return cs && TREE_CODE (cs) == NAMESPACE_DECL; | |
afb0918a MM |
463 | } |
464 | ||
d6479fe7 | 465 | /* Return the scope of DECL, as appropriate when doing name-lookup. */ |
8d08fdba | 466 | |
55de1b66 | 467 | tree |
86ac0575 | 468 | context_for_name_lookup (tree decl) |
d6479fe7 MM |
469 | { |
470 | /* [class.union] | |
c8094d83 | 471 | |
d6479fe7 MM |
472 | For the purposes of name lookup, after the anonymous union |
473 | definition, the members of the anonymous union are considered to | |
834c6dff | 474 | have been defined in the scope in which the anonymous union is |
c8094d83 | 475 | declared. */ |
55de1b66 | 476 | tree context = DECL_CONTEXT (decl); |
d6479fe7 | 477 | |
8d0d1915 JM |
478 | while (context && TYPE_P (context) |
479 | && (ANON_AGGR_TYPE_P (context) || UNSCOPED_ENUM_P (context))) | |
d6479fe7 MM |
480 | context = TYPE_CONTEXT (context); |
481 | if (!context) | |
482 | context = global_namespace; | |
8d08fdba | 483 | |
d6479fe7 MM |
484 | return context; |
485 | } | |
8d08fdba | 486 | |
7ac2c0bd JM |
487 | /* Returns true iff DECL is declared in TYPE. */ |
488 | ||
489 | static bool | |
490 | member_declared_in_type (tree decl, tree type) | |
491 | { | |
492 | /* A normal declaration obviously counts. */ | |
493 | if (context_for_name_lookup (decl) == type) | |
494 | return true; | |
495 | /* So does a using or access declaration. */ | |
496 | if (DECL_LANG_SPECIFIC (decl) && !DECL_DISCRIMINATOR_P (decl) | |
497 | && purpose_member (type, DECL_ACCESS (decl))) | |
498 | return true; | |
499 | return false; | |
500 | } | |
501 | ||
c35cce41 | 502 | /* The accessibility routines use BINFO_ACCESS for scratch space |
cd0be382 | 503 | during the computation of the accessibility of some declaration. */ |
c35cce41 | 504 | |
7ac2c0bd JM |
505 | /* Avoid walking up past a declaration of the member. */ |
506 | ||
507 | static tree | |
508 | dfs_access_in_type_pre (tree binfo, void *data) | |
509 | { | |
510 | tree decl = (tree) data; | |
511 | tree type = BINFO_TYPE (binfo); | |
512 | if (member_declared_in_type (decl, type)) | |
513 | return dfs_skip_bases; | |
514 | return NULL_TREE; | |
515 | } | |
516 | ||
c35cce41 | 517 | #define BINFO_ACCESS(NODE) \ |
dbbf88d1 | 518 | ((access_kind) ((TREE_PUBLIC (NODE) << 1) | TREE_PRIVATE (NODE))) |
c35cce41 MM |
519 | |
520 | /* Set the access associated with NODE to ACCESS. */ | |
521 | ||
522 | #define SET_BINFO_ACCESS(NODE, ACCESS) \ | |
dbbf88d1 NS |
523 | ((TREE_PUBLIC (NODE) = ((ACCESS) & 2) != 0), \ |
524 | (TREE_PRIVATE (NODE) = ((ACCESS) & 1) != 0)) | |
c35cce41 | 525 | |
d6479fe7 MM |
526 | /* Called from access_in_type via dfs_walk. Calculate the access to |
527 | DATA (which is really a DECL) in BINFO. */ | |
eae89e04 | 528 | |
d6479fe7 | 529 | static tree |
86ac0575 | 530 | dfs_access_in_type (tree binfo, void *data) |
d6479fe7 MM |
531 | { |
532 | tree decl = (tree) data; | |
533 | tree type = BINFO_TYPE (binfo); | |
c35cce41 | 534 | access_kind access = ak_none; |
8d08fdba | 535 | |
d6479fe7 | 536 | if (context_for_name_lookup (decl) == type) |
8d08fdba | 537 | { |
a653d067 | 538 | /* If we have descended to the scope of DECL, just note the |
d6479fe7 MM |
539 | appropriate access. */ |
540 | if (TREE_PRIVATE (decl)) | |
c35cce41 | 541 | access = ak_private; |
d6479fe7 | 542 | else if (TREE_PROTECTED (decl)) |
c35cce41 | 543 | access = ak_protected; |
d6479fe7 | 544 | else |
c35cce41 | 545 | access = ak_public; |
8d08fdba | 546 | } |
c8094d83 | 547 | else |
d6479fe7 MM |
548 | { |
549 | /* First, check for an access-declaration that gives us more | |
8d0d1915 | 550 | access to the DECL. */ |
8e4ce833 | 551 | if (DECL_LANG_SPECIFIC (decl) && !DECL_DISCRIMINATOR_P (decl)) |
d6479fe7 | 552 | { |
c35cce41 | 553 | tree decl_access = purpose_member (type, DECL_ACCESS (decl)); |
c8094d83 | 554 | |
c35cce41 | 555 | if (decl_access) |
dbbf88d1 NS |
556 | { |
557 | decl_access = TREE_VALUE (decl_access); | |
c8094d83 | 558 | |
dbbf88d1 NS |
559 | if (decl_access == access_public_node) |
560 | access = ak_public; | |
561 | else if (decl_access == access_protected_node) | |
562 | access = ak_protected; | |
563 | else if (decl_access == access_private_node) | |
564 | access = ak_private; | |
565 | else | |
50bc768d | 566 | gcc_unreachable (); |
dbbf88d1 | 567 | } |
d6479fe7 MM |
568 | } |
569 | ||
570 | if (!access) | |
571 | { | |
572 | int i; | |
63d1c7b3 | 573 | tree base_binfo; |
9771b263 | 574 | vec<tree, va_gc> *accesses; |
c8094d83 | 575 | |
d6479fe7 MM |
576 | /* Otherwise, scan our baseclasses, and pick the most favorable |
577 | access. */ | |
604a3205 | 578 | accesses = BINFO_BASE_ACCESSES (binfo); |
fa743e8c | 579 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
d6479fe7 | 580 | { |
9771b263 | 581 | tree base_access = (*accesses)[i]; |
dbbf88d1 | 582 | access_kind base_access_now = BINFO_ACCESS (base_binfo); |
d6479fe7 | 583 | |
dbbf88d1 | 584 | if (base_access_now == ak_none || base_access_now == ak_private) |
d6479fe7 MM |
585 | /* If it was not accessible in the base, or only |
586 | accessible as a private member, we can't access it | |
587 | all. */ | |
dbbf88d1 NS |
588 | base_access_now = ak_none; |
589 | else if (base_access == access_protected_node) | |
590 | /* Public and protected members in the base become | |
d6479fe7 | 591 | protected here. */ |
dbbf88d1 NS |
592 | base_access_now = ak_protected; |
593 | else if (base_access == access_private_node) | |
594 | /* Public and protected members in the base become | |
d6479fe7 | 595 | private here. */ |
dbbf88d1 | 596 | base_access_now = ak_private; |
d6479fe7 MM |
597 | |
598 | /* See if the new access, via this base, gives more | |
599 | access than our previous best access. */ | |
dbbf88d1 NS |
600 | if (base_access_now != ak_none |
601 | && (access == ak_none || base_access_now < access)) | |
d6479fe7 | 602 | { |
dbbf88d1 | 603 | access = base_access_now; |
8d08fdba | 604 | |
d6479fe7 | 605 | /* If the new access is public, we can't do better. */ |
c35cce41 | 606 | if (access == ak_public) |
d6479fe7 MM |
607 | break; |
608 | } | |
609 | } | |
610 | } | |
611 | } | |
faae18ab | 612 | |
d6479fe7 | 613 | /* Note the access to DECL in TYPE. */ |
c35cce41 | 614 | SET_BINFO_ACCESS (binfo, access); |
02020185 | 615 | |
d6479fe7 MM |
616 | return NULL_TREE; |
617 | } | |
8d08fdba | 618 | |
d6479fe7 | 619 | /* Return the access to DECL in TYPE. */ |
8d08fdba | 620 | |
c35cce41 | 621 | static access_kind |
86ac0575 | 622 | access_in_type (tree type, tree decl) |
d6479fe7 MM |
623 | { |
624 | tree binfo = TYPE_BINFO (type); | |
8d08fdba | 625 | |
d6479fe7 | 626 | /* We must take into account |
8d08fdba | 627 | |
d6479fe7 | 628 | [class.paths] |
8d08fdba | 629 | |
d6479fe7 MM |
630 | If a name can be reached by several paths through a multiple |
631 | inheritance graph, the access is that of the path that gives | |
c8094d83 | 632 | most access. |
8d08fdba | 633 | |
d6479fe7 MM |
634 | The algorithm we use is to make a post-order depth-first traversal |
635 | of the base-class hierarchy. As we come up the tree, we annotate | |
636 | each node with the most lenient access. */ | |
7ac2c0bd | 637 | dfs_walk_once (binfo, dfs_access_in_type_pre, dfs_access_in_type, decl); |
8d08fdba | 638 | |
c35cce41 | 639 | return BINFO_ACCESS (binfo); |
d6479fe7 MM |
640 | } |
641 | ||
7ac2c0bd JM |
642 | /* Returns nonzero if it is OK to access DECL named in TYPE through an object |
643 | of OTYPE in the context of DERIVED. */ | |
6a629cac MM |
644 | |
645 | static int | |
7ac2c0bd | 646 | protected_accessible_p (tree decl, tree derived, tree type, tree otype) |
6a629cac | 647 | { |
6a629cac MM |
648 | /* We're checking this clause from [class.access.base] |
649 | ||
650 | m as a member of N is protected, and the reference occurs in a | |
651 | member or friend of class N, or in a member or friend of a | |
1ceb2263 JM |
652 | class P derived from N, where m as a member of P is public, private |
653 | or protected. | |
6a629cac | 654 | |
7ac2c0bd | 655 | Here DERIVED is a possible P, DECL is m and TYPE is N. */ |
d7cca31e | 656 | |
1ceb2263 | 657 | /* If DERIVED isn't derived from N, then it can't be a P. */ |
7ac2c0bd | 658 | if (!DERIVED_FROM_P (type, derived)) |
6a629cac | 659 | return 0; |
c8094d83 | 660 | |
10839133 AO |
661 | /* DECL_NONSTATIC_MEMBER_P won't work for USING_DECLs. */ |
662 | decl = strip_using_decl (decl); | |
663 | /* We don't expect or support dependent decls. */ | |
664 | gcc_assert (TREE_CODE (decl) != USING_DECL); | |
665 | ||
6a629cac MM |
666 | /* [class.protected] |
667 | ||
668 | When a friend or a member function of a derived class references | |
d20b7173 | 669 | a protected non-static member of a base class, an access check |
6a629cac | 670 | applies in addition to those described earlier in clause |
d7cca31e | 671 | _class.access_) Except when forming a pointer to member |
6a629cac MM |
672 | (_expr.unary.op_), the access must be through a pointer to, |
673 | reference to, or object of the derived class itself (or any class | |
674 | derived from that class) (_expr.ref_). If the access is to form | |
675 | a pointer to member, the nested-name-specifier shall name the | |
676 | derived class (or any class derived from that class). */ | |
7ac2c0bd JM |
677 | if (DECL_NONSTATIC_MEMBER_P (decl) |
678 | && !DERIVED_FROM_P (derived, otype)) | |
679 | return 0; | |
6a629cac MM |
680 | |
681 | return 1; | |
682 | } | |
683 | ||
7ac2c0bd JM |
684 | /* Returns nonzero if SCOPE is a type or a friend of a type which would be able |
685 | to access DECL through TYPE. OTYPE is the type of the object. */ | |
6a629cac MM |
686 | |
687 | static int | |
7ac2c0bd | 688 | friend_accessible_p (tree scope, tree decl, tree type, tree otype) |
6a629cac | 689 | { |
7ac2c0bd JM |
690 | /* We're checking this clause from [class.access.base] |
691 | ||
692 | m as a member of N is protected, and the reference occurs in a | |
693 | member or friend of class N, or in a member or friend of a | |
694 | class P derived from N, where m as a member of P is public, private | |
695 | or protected. | |
696 | ||
697 | Here DECL is m and TYPE is N. SCOPE is the current context, | |
698 | and we check all its possible Ps. */ | |
6a629cac MM |
699 | tree befriending_classes; |
700 | tree t; | |
701 | ||
702 | if (!scope) | |
703 | return 0; | |
704 | ||
8db29d88 AO |
705 | if (is_global_friend (scope)) |
706 | return 1; | |
707 | ||
7ac2c0bd JM |
708 | /* Is SCOPE itself a suitable P? */ |
709 | if (TYPE_P (scope) && protected_accessible_p (decl, scope, type, otype)) | |
710 | return 1; | |
711 | ||
9ededfc5 | 712 | if (DECL_DECLARES_FUNCTION_P (scope)) |
6a629cac MM |
713 | befriending_classes = DECL_BEFRIENDING_CLASSES (scope); |
714 | else if (TYPE_P (scope)) | |
715 | befriending_classes = CLASSTYPE_BEFRIENDING_CLASSES (scope); | |
716 | else | |
717 | return 0; | |
718 | ||
719 | for (t = befriending_classes; t; t = TREE_CHAIN (t)) | |
7ac2c0bd | 720 | if (protected_accessible_p (decl, TREE_VALUE (t), type, otype)) |
6a629cac MM |
721 | return 1; |
722 | ||
03b1c206 | 723 | /* Nested classes have the same access as their enclosing types, as |
7ac2c0bd | 724 | per DR 45 (this is a change from C++98). */ |
445ab443 | 725 | if (TYPE_P (scope)) |
7ac2c0bd JM |
726 | if (friend_accessible_p (TYPE_CONTEXT (scope), decl, type, otype)) |
727 | return 1; | |
445ab443 | 728 | |
9ededfc5 | 729 | if (DECL_DECLARES_FUNCTION_P (scope)) |
6a629cac | 730 | { |
c8094d83 MS |
731 | /* Perhaps this SCOPE is a member of a class which is a |
732 | friend. */ | |
18e4be85 | 733 | if (DECL_CLASS_SCOPE_P (scope) |
7ac2c0bd | 734 | && friend_accessible_p (DECL_CONTEXT (scope), decl, type, otype)) |
6a629cac | 735 | return 1; |
29853c65 PP |
736 | /* Perhaps SCOPE is a friend function defined inside a class from which |
737 | DECL is accessible. Checking this is necessary only when the class | |
738 | is dependent, for otherwise add_friend will already have added the | |
739 | class to SCOPE's DECL_BEFRIENDING_CLASSES. */ | |
740 | if (tree fctx = DECL_FRIEND_CONTEXT (scope)) | |
741 | if (dependent_type_p (fctx) | |
742 | && protected_accessible_p (decl, fctx, type, otype)) | |
743 | return 1; | |
7ac2c0bd | 744 | } |
6a629cac | 745 | |
7ac2c0bd JM |
746 | /* Maybe scope's template is a friend. */ |
747 | if (tree tinfo = get_template_info (scope)) | |
748 | { | |
749 | tree tmpl = TI_TEMPLATE (tinfo); | |
750 | if (DECL_CLASS_TEMPLATE_P (tmpl)) | |
751 | tmpl = TREE_TYPE (tmpl); | |
752 | else | |
753 | tmpl = DECL_TEMPLATE_RESULT (tmpl); | |
754 | if (tmpl != scope) | |
e59f7322 | 755 | { |
e59f7322 KL |
756 | /* Increment processing_template_decl to make sure that |
757 | dependent_type_p works correctly. */ | |
758 | ++processing_template_decl; | |
7ac2c0bd | 759 | int ret = friend_accessible_p (tmpl, decl, type, otype); |
e59f7322 | 760 | --processing_template_decl; |
7ac2c0bd JM |
761 | if (ret) |
762 | return 1; | |
e59f7322 | 763 | } |
6a629cac | 764 | } |
6a629cac | 765 | |
7ac2c0bd JM |
766 | /* If is_friend is true, we should have found a befriending class. */ |
767 | gcc_checking_assert (!is_friend (type, scope)); | |
768 | ||
6a629cac | 769 | return 0; |
70adf8a9 JM |
770 | } |
771 | ||
7ac2c0bd JM |
772 | struct dfs_accessible_data |
773 | { | |
774 | tree decl; | |
775 | tree object_type; | |
776 | }; | |
777 | ||
778 | /* Avoid walking up past a declaration of the member. */ | |
779 | ||
780 | static tree | |
781 | dfs_accessible_pre (tree binfo, void *data) | |
782 | { | |
783 | dfs_accessible_data *d = (dfs_accessible_data *)data; | |
784 | tree type = BINFO_TYPE (binfo); | |
785 | if (member_declared_in_type (d->decl, type)) | |
786 | return dfs_skip_bases; | |
787 | return NULL_TREE; | |
788 | } | |
789 | ||
6936e493 NS |
790 | /* Called via dfs_walk_once_accessible from accessible_p */ |
791 | ||
5d5a519f | 792 | static tree |
7ac2c0bd | 793 | dfs_accessible_post (tree binfo, void *data) |
5d5a519f | 794 | { |
7ac2c0bd JM |
795 | /* access_in_type already set BINFO_ACCESS for us. */ |
796 | access_kind access = BINFO_ACCESS (binfo); | |
797 | tree N = BINFO_TYPE (binfo); | |
798 | dfs_accessible_data *d = (dfs_accessible_data *)data; | |
799 | tree decl = d->decl; | |
800 | tree scope = current_nonlambda_scope (); | |
801 | ||
802 | /* A member m is accessible at the point R when named in class N if */ | |
803 | switch (access) | |
a5201a91 | 804 | { |
7ac2c0bd JM |
805 | case ak_none: |
806 | return NULL_TREE; | |
c8094d83 | 807 | |
7ac2c0bd JM |
808 | case ak_public: |
809 | /* m as a member of N is public, or */ | |
810 | return binfo; | |
811 | ||
812 | case ak_private: | |
813 | { | |
814 | /* m as a member of N is private, and R occurs in a member or friend of | |
815 | class N, or */ | |
816 | if (scope && TREE_CODE (scope) != NAMESPACE_DECL | |
817 | && is_friend (N, scope)) | |
818 | return binfo; | |
819 | return NULL_TREE; | |
820 | } | |
821 | ||
822 | case ak_protected: | |
823 | { | |
824 | /* m as a member of N is protected, and R occurs in a member or friend | |
825 | of class N, or in a member or friend of a class P derived from N, | |
826 | where m as a member of P is public, private, or protected */ | |
827 | if (friend_accessible_p (scope, decl, N, d->object_type)) | |
828 | return binfo; | |
829 | return NULL_TREE; | |
830 | } | |
831 | ||
832 | default: | |
833 | gcc_unreachable (); | |
834 | } | |
5d5a519f NS |
835 | } |
836 | ||
cf3c30d3 JM |
837 | /* Like accessible_p below, but within a template returns true iff DECL is |
838 | accessible in TYPE to all possible instantiations of the template. */ | |
839 | ||
840 | int | |
841 | accessible_in_template_p (tree type, tree decl) | |
842 | { | |
843 | int save_ptd = processing_template_decl; | |
844 | processing_template_decl = 0; | |
845 | int val = accessible_p (type, decl, false); | |
846 | processing_template_decl = save_ptd; | |
847 | return val; | |
848 | } | |
849 | ||
d6479fe7 | 850 | /* DECL is a declaration from a base class of TYPE, which was the |
838dfd8a | 851 | class used to name DECL. Return nonzero if, in the current |
d6479fe7 | 852 | context, DECL is accessible. If TYPE is actually a BINFO node, |
8084bf81 | 853 | then we can tell in what context the access is occurring by looking |
18e4be85 NS |
854 | at the most derived class along the path indicated by BINFO. If |
855 | CONSIDER_LOCAL is true, do consider special access the current | |
03fd3f84 | 856 | scope or friendship thereof we might have. */ |
d6479fe7 | 857 | |
c8094d83 | 858 | int |
18e4be85 | 859 | accessible_p (tree type, tree decl, bool consider_local_p) |
d6479fe7 | 860 | { |
d6479fe7 | 861 | tree binfo; |
a653d067 | 862 | access_kind access; |
d6479fe7 | 863 | |
d6479fe7 MM |
864 | /* If this declaration is in a block or namespace scope, there's no |
865 | access control. */ | |
866 | if (!TYPE_P (context_for_name_lookup (decl))) | |
867 | return 1; | |
868 | ||
0e8c9b28 | 869 | /* There is no need to perform access checks inside a thunk. */ |
7ac2c0bd | 870 | if (current_function_decl && DECL_THUNK_P (current_function_decl)) |
0e8c9b28 MM |
871 | return 1; |
872 | ||
b850dd2f | 873 | tree otype = NULL_TREE; |
d6479fe7 MM |
874 | if (!TYPE_P (type)) |
875 | { | |
7ac2c0bd JM |
876 | /* When accessing a non-static member, the most derived type in the |
877 | binfo chain is the type of the object; remember that type for | |
878 | protected_accessible_p. */ | |
879 | for (tree b = type; b; b = BINFO_INHERITANCE_CHAIN (b)) | |
880 | otype = BINFO_TYPE (b); | |
d6479fe7 | 881 | type = BINFO_TYPE (type); |
8d08fdba | 882 | } |
d6479fe7 | 883 | else |
7ac2c0bd | 884 | otype = type; |
d6479fe7 MM |
885 | |
886 | /* [class.access.base] | |
887 | ||
888 | A member m is accessible when named in class N if | |
889 | ||
890 | --m as a member of N is public, or | |
8d08fdba | 891 | |
d6479fe7 MM |
892 | --m as a member of N is private, and the reference occurs in a |
893 | member or friend of class N, or | |
8d08fdba | 894 | |
d6479fe7 MM |
895 | --m as a member of N is protected, and the reference occurs in a |
896 | member or friend of class N, or in a member or friend of a | |
7ac2c0bd | 897 | class P derived from N, where m as a member of P is public, private or |
d6479fe7 MM |
898 | protected, or |
899 | ||
900 | --there exists a base class B of N that is accessible at the point | |
c8094d83 | 901 | of reference, and m is accessible when named in class B. |
d6479fe7 MM |
902 | |
903 | We walk the base class hierarchy, checking these conditions. */ | |
904 | ||
7ac2c0bd JM |
905 | /* We walk using TYPE_BINFO (type) because access_in_type will set |
906 | BINFO_ACCESS on it and its bases. */ | |
d6479fe7 MM |
907 | binfo = TYPE_BINFO (type); |
908 | ||
909 | /* Compute the accessibility of DECL in the class hierarchy | |
910 | dominated by type. */ | |
a653d067 | 911 | access = access_in_type (type, decl); |
7ac2c0bd | 912 | if (access == ak_public) |
a653d067 | 913 | return 1; |
c8094d83 | 914 | |
7ac2c0bd JM |
915 | /* If we aren't considering the point of reference, only the first bullet |
916 | applies. */ | |
18e4be85 NS |
917 | if (!consider_local_p) |
918 | return 0; | |
c8094d83 | 919 | |
7ac2c0bd JM |
920 | dfs_accessible_data d = { decl, otype }; |
921 | ||
18e4be85 NS |
922 | /* Walk the hierarchy again, looking for a base class that allows |
923 | access. */ | |
924 | return dfs_walk_once_accessible (binfo, /*friends=*/true, | |
7ac2c0bd JM |
925 | dfs_accessible_pre, |
926 | dfs_accessible_post, &d) | |
18e4be85 | 927 | != NULL_TREE; |
8d08fdba MS |
928 | } |
929 | ||
7d4bdeed | 930 | struct lookup_field_info { |
d6479fe7 MM |
931 | /* The type in which we're looking. */ |
932 | tree type; | |
7d4bdeed MM |
933 | /* The name of the field for which we're looking. */ |
934 | tree name; | |
935 | /* If non-NULL, the current result of the lookup. */ | |
936 | tree rval; | |
937 | /* The path to RVAL. */ | |
938 | tree rval_binfo; | |
d6479fe7 MM |
939 | /* If non-NULL, the lookup was ambiguous, and this is a list of the |
940 | candidates. */ | |
7d4bdeed | 941 | tree ambiguous; |
838dfd8a | 942 | /* If nonzero, we are looking for types, not data members. */ |
7d4bdeed MM |
943 | int want_type; |
944 | /* If something went wrong, a message indicating what. */ | |
d8e178a0 | 945 | const char *errstr; |
7d4bdeed MM |
946 | }; |
947 | ||
a8cef3cb | 948 | /* True for a class member means that it is shared between all objects |
bd0d5d4a JM |
949 | of that class. |
950 | ||
951 | [class.member.lookup]:If the resulting set of declarations are not all | |
d20b7173 | 952 | from sub-objects of the same type, or the set has a non-static member |
bd0d5d4a JM |
953 | and includes members from distinct sub-objects, there is an ambiguity |
954 | and the program is ill-formed. | |
955 | ||
d20b7173 | 956 | This function checks that T contains no non-static members. */ |
bd0d5d4a | 957 | |
a8cef3cb | 958 | bool |
86ac0575 | 959 | shared_member_p (tree t) |
bd0d5d4a | 960 | { |
a8cef3cb | 961 | if (VAR_P (t) || TREE_CODE (t) == TYPE_DECL |
bd0d5d4a | 962 | || TREE_CODE (t) == CONST_DECL) |
a8cef3cb | 963 | return true; |
bd0d5d4a JM |
964 | if (is_overloaded_fn (t)) |
965 | { | |
19b476fb | 966 | for (ovl_iterator iter (get_fns (t)); iter; ++iter) |
10839133 AO |
967 | { |
968 | tree decl = strip_using_decl (*iter); | |
a8cef3cb PP |
969 | if (TREE_CODE (decl) == USING_DECL) |
970 | /* Conservatively assume a dependent using-declaration | |
971 | might resolve to a non-static member. */ | |
972 | return false; | |
10839133 | 973 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) |
a8cef3cb | 974 | return false; |
10839133 | 975 | } |
a8cef3cb | 976 | return true; |
bd0d5d4a | 977 | } |
a8cef3cb | 978 | return false; |
bd0d5d4a JM |
979 | } |
980 | ||
f8ad2d21 NS |
981 | /* Routine to see if the sub-object denoted by the binfo PARENT can be |
982 | found as a base class and sub-object of the object denoted by | |
983 | BINFO. */ | |
984 | ||
985 | static int | |
986 | is_subobject_of_p (tree parent, tree binfo) | |
987 | { | |
988 | tree probe; | |
c8094d83 | 989 | |
f8ad2d21 NS |
990 | for (probe = parent; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) |
991 | { | |
992 | if (probe == binfo) | |
993 | return 1; | |
994 | if (BINFO_VIRTUAL_P (probe)) | |
995 | return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (binfo)) | |
996 | != NULL_TREE); | |
997 | } | |
998 | return 0; | |
999 | } | |
1000 | ||
7d4bdeed MM |
1001 | /* DATA is really a struct lookup_field_info. Look for a field with |
1002 | the name indicated there in BINFO. If this function returns a | |
1003 | non-NULL value it is the result of the lookup. Called from | |
1004 | lookup_field via breadth_first_search. */ | |
1005 | ||
1006 | static tree | |
86ac0575 | 1007 | lookup_field_r (tree binfo, void *data) |
7d4bdeed MM |
1008 | { |
1009 | struct lookup_field_info *lfi = (struct lookup_field_info *) data; | |
1010 | tree type = BINFO_TYPE (binfo); | |
4bb0968f | 1011 | tree nval = NULL_TREE; |
7d4bdeed | 1012 | |
5d5a519f NS |
1013 | /* If this is a dependent base, don't look in it. */ |
1014 | if (BINFO_DEPENDENT_BASE_P (binfo)) | |
1015 | return NULL_TREE; | |
c8094d83 | 1016 | |
5d5a519f NS |
1017 | /* If this base class is hidden by the best-known value so far, we |
1018 | don't need to look. */ | |
1019 | if (lfi->rval_binfo && BINFO_INHERITANCE_CHAIN (binfo) == lfi->rval_binfo | |
1020 | && !BINFO_VIRTUAL_P (binfo)) | |
1021 | return dfs_skip_bases; | |
1022 | ||
b991151b | 1023 | nval = get_class_binding (type, lfi->name, lfi->want_type); |
d6479fe7 | 1024 | |
3d9850f4 NS |
1025 | /* If there is no declaration with the indicated name in this type, |
1026 | then there's nothing to do. */ | |
1027 | if (!nval) | |
1028 | goto done; | |
1029 | ||
7d4bdeed MM |
1030 | /* If the lookup already found a match, and the new value doesn't |
1031 | hide the old one, we might have an ambiguity. */ | |
f8ad2d21 NS |
1032 | if (lfi->rval_binfo |
1033 | && !is_subobject_of_p (lfi->rval_binfo, binfo)) | |
c8094d83 | 1034 | |
7d4bdeed | 1035 | { |
bd0d5d4a | 1036 | if (nval == lfi->rval && shared_member_p (nval)) |
7d4bdeed MM |
1037 | /* The two things are really the same. */ |
1038 | ; | |
f8ad2d21 | 1039 | else if (is_subobject_of_p (binfo, lfi->rval_binfo)) |
7d4bdeed MM |
1040 | /* The previous value hides the new one. */ |
1041 | ; | |
1042 | else | |
1043 | { | |
1044 | /* We have a real ambiguity. We keep a chain of all the | |
1045 | candidates. */ | |
1046 | if (!lfi->ambiguous && lfi->rval) | |
aa65d1a2 MM |
1047 | { |
1048 | /* This is the first time we noticed an ambiguity. Add | |
1049 | what we previously thought was a reasonable candidate | |
1050 | to the list. */ | |
e1b3e07d | 1051 | lfi->ambiguous = tree_cons (NULL_TREE, lfi->rval, NULL_TREE); |
aa65d1a2 MM |
1052 | TREE_TYPE (lfi->ambiguous) = error_mark_node; |
1053 | } | |
1054 | ||
7d4bdeed | 1055 | /* Add the new value. */ |
e1b3e07d | 1056 | lfi->ambiguous = tree_cons (NULL_TREE, nval, lfi->ambiguous); |
aa65d1a2 | 1057 | TREE_TYPE (lfi->ambiguous) = error_mark_node; |
f25a2b52 | 1058 | lfi->errstr = G_("request for member %qD is ambiguous"); |
7d4bdeed MM |
1059 | } |
1060 | } | |
1061 | else | |
1062 | { | |
d6479fe7 | 1063 | lfi->rval = nval; |
7d4bdeed MM |
1064 | lfi->rval_binfo = binfo; |
1065 | } | |
1066 | ||
5d5a519f NS |
1067 | done: |
1068 | /* Don't look for constructors or destructors in base classes. */ | |
84c0088f | 1069 | if (IDENTIFIER_CDTOR_P (lfi->name)) |
5d5a519f | 1070 | return dfs_skip_bases; |
d6479fe7 | 1071 | return NULL_TREE; |
7d4bdeed MM |
1072 | } |
1073 | ||
c2a124b2 | 1074 | /* Return a "baselink" with BASELINK_BINFO, BASELINK_ACCESS_BINFO, |
4ba126e4 MM |
1075 | BASELINK_FUNCTIONS, and BASELINK_OPTYPE set to BINFO, ACCESS_BINFO, |
1076 | FUNCTIONS, and OPTYPE respectively. */ | |
1077 | ||
1078 | tree | |
1079 | build_baselink (tree binfo, tree access_binfo, tree functions, tree optype) | |
1080 | { | |
1081 | tree baselink; | |
1082 | ||
d509bb8c | 1083 | gcc_assert (OVL_P (functions) || TREE_CODE (functions) == TEMPLATE_ID_EXPR); |
50bc768d NS |
1084 | gcc_assert (!optype || TYPE_P (optype)); |
1085 | gcc_assert (TREE_TYPE (functions)); | |
4ba126e4 | 1086 | |
5dae1114 MM |
1087 | baselink = make_node (BASELINK); |
1088 | TREE_TYPE (baselink) = TREE_TYPE (functions); | |
4ba126e4 MM |
1089 | BASELINK_BINFO (baselink) = binfo; |
1090 | BASELINK_ACCESS_BINFO (baselink) = access_binfo; | |
1091 | BASELINK_FUNCTIONS (baselink) = functions; | |
1092 | BASELINK_OPTYPE (baselink) = optype; | |
1093 | ||
1094 | return baselink; | |
1095 | } | |
1096 | ||
1a03d967 | 1097 | /* Look for a member named NAME in an inheritance lattice dominated by |
171d2f50 NS |
1098 | XBASETYPE. If PROTECT is 0 or two, we do not check access. If it |
1099 | is 1, we enforce accessibility. If PROTECT is zero, then, for an | |
1100 | ambiguous lookup, we return NULL. If PROTECT is 1, we issue error | |
1101 | messages about inaccessible or ambiguous lookup. If PROTECT is 2, | |
1102 | we return a TREE_LIST whose TREE_TYPE is error_mark_node and whose | |
1103 | TREE_VALUEs are the list of ambiguous candidates. | |
1104 | ||
1105 | WANT_TYPE is 1 when we should only return TYPE_DECLs. | |
1106 | ||
10791753 DM |
1107 | If nothing can be found return NULL_TREE and do not issue an error. |
1108 | ||
1109 | If non-NULL, failure information is written back to AFI. */ | |
e92cc029 | 1110 | |
8d08fdba | 1111 | tree |
db422ace | 1112 | lookup_member (tree xbasetype, tree name, int protect, bool want_type, |
10791753 | 1113 | tsubst_flags_t complain, access_failure_info *afi) |
8d08fdba | 1114 | { |
7d4bdeed MM |
1115 | tree rval, rval_binfo = NULL_TREE; |
1116 | tree type = NULL_TREE, basetype_path = NULL_TREE; | |
1117 | struct lookup_field_info lfi; | |
8d08fdba MS |
1118 | |
1119 | /* rval_binfo is the binfo associated with the found member, note, | |
1120 | this can be set with useful information, even when rval is not | |
1121 | set, because it must deal with ALL members, not just non-function | |
1122 | members. It is used for ambiguity checking and the hidden | |
1123 | checks. Whereas rval is only set if a proper (not hidden) | |
1124 | non-function member is found. */ | |
1125 | ||
d8e178a0 | 1126 | const char *errstr = 0; |
8d08fdba | 1127 | |
7063212f DS |
1128 | if (name == error_mark_node |
1129 | || xbasetype == NULL_TREE | |
1130 | || xbasetype == error_mark_node) | |
5973c743 PC |
1131 | return NULL_TREE; |
1132 | ||
9dc6f476 | 1133 | gcc_assert (identifier_p (name)); |
de22184b | 1134 | |
95b4aca6 | 1135 | if (TREE_CODE (xbasetype) == TREE_BINFO) |
8d08fdba | 1136 | { |
8d08fdba | 1137 | type = BINFO_TYPE (xbasetype); |
39211cd5 | 1138 | basetype_path = xbasetype; |
8d08fdba | 1139 | } |
6df5158a | 1140 | else |
39211cd5 | 1141 | { |
9e1e64ec | 1142 | if (!RECORD_OR_UNION_CODE_P (TREE_CODE (xbasetype))) |
a82f93ac | 1143 | return NULL_TREE; |
238109cd | 1144 | type = xbasetype; |
cad7e87b | 1145 | xbasetype = NULL_TREE; |
6df5158a NS |
1146 | } |
1147 | ||
cad7e87b | 1148 | type = complete_type (type); |
971e17ff AS |
1149 | |
1150 | /* Make sure we're looking for a member of the current instantiation in the | |
1151 | right partial specialization. */ | |
d9338471 | 1152 | if (dependent_type_p (type)) |
aabdb831 JM |
1153 | if (tree t = currently_open_class (type)) |
1154 | type = t; | |
971e17ff | 1155 | |
cad7e87b NS |
1156 | if (!basetype_path) |
1157 | basetype_path = TYPE_BINFO (type); | |
1158 | ||
1159 | if (!basetype_path) | |
1160 | return NULL_TREE; | |
8d08fdba | 1161 | |
fad205ff | 1162 | memset (&lfi, 0, sizeof (lfi)); |
d6479fe7 | 1163 | lfi.type = type; |
7d4bdeed | 1164 | lfi.name = name; |
7d4bdeed | 1165 | lfi.want_type = want_type; |
5d5a519f | 1166 | dfs_walk_all (basetype_path, &lookup_field_r, NULL, &lfi); |
7d4bdeed MM |
1167 | rval = lfi.rval; |
1168 | rval_binfo = lfi.rval_binfo; | |
1169 | if (rval_binfo) | |
1170 | type = BINFO_TYPE (rval_binfo); | |
1171 | errstr = lfi.errstr; | |
1172 | ||
1173 | /* If we are not interested in ambiguities, don't report them; | |
1174 | just return NULL_TREE. */ | |
1175 | if (!protect && lfi.ambiguous) | |
1176 | return NULL_TREE; | |
c8094d83 MS |
1177 | |
1178 | if (protect == 2) | |
8f032717 MM |
1179 | { |
1180 | if (lfi.ambiguous) | |
aa65d1a2 | 1181 | return lfi.ambiguous; |
8f032717 MM |
1182 | else |
1183 | protect = 0; | |
1184 | } | |
1185 | ||
d6479fe7 MM |
1186 | /* [class.access] |
1187 | ||
1188 | In the case of overloaded function names, access control is | |
eff3a276 MM |
1189 | applied to the function selected by overloaded resolution. |
1190 | ||
1191 | We cannot check here, even if RVAL is only a single non-static | |
1192 | member function, since we do not know what the "this" pointer | |
1193 | will be. For: | |
1194 | ||
1195 | class A { protected: void f(); }; | |
1196 | class B : public A { | |
1197 | void g(A *p) { | |
1198 | f(); // OK | |
1199 | p->f(); // Not OK. | |
1200 | } | |
1201 | }; | |
1202 | ||
1203 | only the first call to "f" is valid. However, if the function is | |
1204 | static, we can check. */ | |
1205 | if (rval && protect | |
57910f3a JM |
1206 | && !really_overloaded_fn (rval)) |
1207 | { | |
1208 | tree decl = is_overloaded_fn (rval) ? get_first_fn (rval) : rval; | |
10839133 AO |
1209 | decl = strip_using_decl (decl); |
1210 | /* A dependent USING_DECL will be checked after tsubsting. */ | |
1211 | if (TREE_CODE (decl) != USING_DECL | |
1212 | && !DECL_NONSTATIC_MEMBER_FUNCTION_P (decl) | |
0e69fdf0 | 1213 | && !perform_or_defer_access_check (basetype_path, decl, decl, |
10791753 | 1214 | complain, afi)) |
0e69fdf0 | 1215 | rval = error_mark_node; |
57910f3a | 1216 | } |
9e9ff709 | 1217 | |
8251199e | 1218 | if (errstr && protect) |
8d08fdba | 1219 | { |
db422ace PC |
1220 | if (complain & tf_error) |
1221 | { | |
1222 | error (errstr, name, type); | |
1223 | if (lfi.ambiguous) | |
1224 | print_candidates (lfi.ambiguous); | |
1225 | } | |
8d08fdba MS |
1226 | rval = error_mark_node; |
1227 | } | |
b3709d9b | 1228 | |
8d75b883 PP |
1229 | if (rval && is_overloaded_fn (rval) |
1230 | /* Don't use a BASELINK for class-scope deduction guides since | |
1231 | they're not actually member functions. */ | |
1232 | && !dguide_name_p (name)) | |
4ba126e4 | 1233 | rval = build_baselink (rval_binfo, basetype_path, rval, |
84c0088f | 1234 | (IDENTIFIER_CONV_OP_P (name) |
4ba126e4 | 1235 | ? TREE_TYPE (name): NULL_TREE)); |
d6479fe7 MM |
1236 | return rval; |
1237 | } | |
1238 | ||
8ece8dfb DM |
1239 | /* Helper class for lookup_member_fuzzy. */ |
1240 | ||
1241 | class lookup_field_fuzzy_info | |
1242 | { | |
1243 | public: | |
1244 | lookup_field_fuzzy_info (bool want_type_p) : | |
1245 | m_want_type_p (want_type_p), m_candidates () {} | |
1246 | ||
8ece8dfb DM |
1247 | void fuzzy_lookup_field (tree type); |
1248 | ||
1249 | /* If true, we are looking for types, not data members. */ | |
1250 | bool m_want_type_p; | |
1251 | /* The result: a vec of identifiers. */ | |
1252 | auto_vec<tree> m_candidates; | |
1253 | }; | |
1254 | ||
8ece8dfb DM |
1255 | /* Locate all fields within TYPE, append them to m_candidates. */ |
1256 | ||
1257 | void | |
1258 | lookup_field_fuzzy_info::fuzzy_lookup_field (tree type) | |
1259 | { | |
52ed68f7 | 1260 | if (!CLASS_TYPE_P (type)) |
8ece8dfb DM |
1261 | return; |
1262 | ||
1263 | for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) | |
1264 | { | |
66bd3086 DM |
1265 | if (m_want_type_p && !DECL_DECLARES_TYPE_P (field)) |
1266 | continue; | |
1267 | ||
1268 | if (!DECL_NAME (field)) | |
1269 | continue; | |
1270 | ||
1271 | if (is_lambda_ignored_entity (field)) | |
1272 | continue; | |
1273 | ||
1274 | m_candidates.safe_push (DECL_NAME (field)); | |
8ece8dfb DM |
1275 | } |
1276 | } | |
1277 | ||
1278 | ||
1279 | /* Helper function for lookup_member_fuzzy, called via dfs_walk_all | |
1280 | DATA is really a lookup_field_fuzzy_info. Look for a field with | |
1281 | the name indicated there in BINFO. Gathers pertinent identifiers into | |
1282 | m_candidates. */ | |
1283 | ||
1284 | static tree | |
1285 | lookup_field_fuzzy_r (tree binfo, void *data) | |
1286 | { | |
1287 | lookup_field_fuzzy_info *lffi = (lookup_field_fuzzy_info *) data; | |
1288 | tree type = BINFO_TYPE (binfo); | |
1289 | ||
8ece8dfb DM |
1290 | lffi->fuzzy_lookup_field (type); |
1291 | ||
1292 | return NULL_TREE; | |
1293 | } | |
1294 | ||
1295 | /* Like lookup_member, but try to find the closest match for NAME, | |
1296 | rather than an exact match, and return an identifier (or NULL_TREE). | |
1297 | Do not complain. */ | |
1298 | ||
1299 | tree | |
1300 | lookup_member_fuzzy (tree xbasetype, tree name, bool want_type_p) | |
1301 | { | |
1302 | tree type = NULL_TREE, basetype_path = NULL_TREE; | |
99b1c316 | 1303 | class lookup_field_fuzzy_info lffi (want_type_p); |
8ece8dfb DM |
1304 | |
1305 | /* rval_binfo is the binfo associated with the found member, note, | |
1306 | this can be set with useful information, even when rval is not | |
1307 | set, because it must deal with ALL members, not just non-function | |
1308 | members. It is used for ambiguity checking and the hidden | |
1309 | checks. Whereas rval is only set if a proper (not hidden) | |
1310 | non-function member is found. */ | |
1311 | ||
1312 | if (name == error_mark_node | |
1313 | || xbasetype == NULL_TREE | |
1314 | || xbasetype == error_mark_node) | |
1315 | return NULL_TREE; | |
1316 | ||
1317 | gcc_assert (identifier_p (name)); | |
1318 | ||
1319 | if (TREE_CODE (xbasetype) == TREE_BINFO) | |
1320 | { | |
1321 | type = BINFO_TYPE (xbasetype); | |
1322 | basetype_path = xbasetype; | |
1323 | } | |
1324 | else | |
1325 | { | |
1326 | if (!RECORD_OR_UNION_CODE_P (TREE_CODE (xbasetype))) | |
1327 | return NULL_TREE; | |
1328 | type = xbasetype; | |
1329 | xbasetype = NULL_TREE; | |
1330 | } | |
1331 | ||
1332 | type = complete_type (type); | |
1333 | ||
1334 | /* Make sure we're looking for a member of the current instantiation in the | |
1335 | right partial specialization. */ | |
1336 | if (flag_concepts && dependent_type_p (type)) | |
1337 | type = currently_open_class (type); | |
1338 | ||
1339 | if (!basetype_path) | |
1340 | basetype_path = TYPE_BINFO (type); | |
1341 | ||
1342 | if (!basetype_path) | |
1343 | return NULL_TREE; | |
1344 | ||
1345 | /* Populate lffi.m_candidates. */ | |
1346 | dfs_walk_all (basetype_path, &lookup_field_fuzzy_r, NULL, &lffi); | |
1347 | ||
1348 | return find_closest_identifier (name, &lffi.m_candidates); | |
1349 | } | |
1350 | ||
d6479fe7 MM |
1351 | /* Like lookup_member, except that if we find a function member we |
1352 | return NULL_TREE. */ | |
1353 | ||
1354 | tree | |
86ac0575 | 1355 | lookup_field (tree xbasetype, tree name, int protect, bool want_type) |
d6479fe7 | 1356 | { |
db422ace PC |
1357 | tree rval = lookup_member (xbasetype, name, protect, want_type, |
1358 | tf_warning_or_error); | |
c8094d83 | 1359 | |
c566721f GB |
1360 | /* Ignore functions, but propagate the ambiguity list. */ |
1361 | if (!error_operand_p (rval) | |
1362 | && (rval && BASELINK_P (rval))) | |
d6479fe7 MM |
1363 | return NULL_TREE; |
1364 | ||
1365 | return rval; | |
1366 | } | |
1367 | ||
1368 | /* Like lookup_member, except that if we find a non-function member we | |
1369 | return NULL_TREE. */ | |
1370 | ||
1371 | tree | |
098cf31a PP |
1372 | lookup_fnfields (tree xbasetype, tree name, int protect, |
1373 | tsubst_flags_t complain) | |
d6479fe7 | 1374 | { |
db422ace | 1375 | tree rval = lookup_member (xbasetype, name, protect, /*want_type=*/false, |
098cf31a | 1376 | complain); |
d6479fe7 | 1377 | |
c566721f GB |
1378 | /* Ignore non-functions, but propagate the ambiguity list. */ |
1379 | if (!error_operand_p (rval) | |
1380 | && (rval && !BASELINK_P (rval))) | |
d6479fe7 MM |
1381 | return NULL_TREE; |
1382 | ||
8d08fdba MS |
1383 | return rval; |
1384 | } | |
1385 | ||
a723baf1 MM |
1386 | /* DECL is the result of a qualified name lookup. QUALIFYING_SCOPE is |
1387 | the class or namespace used to qualify the name. CONTEXT_CLASS is | |
1388 | the class corresponding to the object in which DECL will be used. | |
1389 | Return a possibly modified version of DECL that takes into account | |
1390 | the CONTEXT_CLASS. | |
9e259dd1 MM |
1391 | |
1392 | In particular, consider an expression like `B::m' in the context of | |
1393 | a derived class `D'. If `B::m' has been resolved to a BASELINK, | |
1394 | then the most derived class indicated by the BASELINK_BINFO will be | |
1395 | `B', not `D'. This function makes that adjustment. */ | |
1396 | ||
1397 | tree | |
c8094d83 | 1398 | adjust_result_of_qualified_name_lookup (tree decl, |
a723baf1 | 1399 | tree qualifying_scope, |
9e259dd1 MM |
1400 | tree context_class) |
1401 | { | |
0616700c | 1402 | if (context_class && context_class != error_mark_node |
9c23e505 | 1403 | && CLASS_TYPE_P (context_class) |
0616700c | 1404 | && CLASS_TYPE_P (qualifying_scope) |
a723baf1 MM |
1405 | && DERIVED_FROM_P (qualifying_scope, context_class) |
1406 | && BASELINK_P (decl)) | |
9e259dd1 MM |
1407 | { |
1408 | tree base; | |
1409 | ||
127b8136 MM |
1410 | /* Look for the QUALIFYING_SCOPE as a base of the CONTEXT_CLASS. |
1411 | Because we do not yet know which function will be chosen by | |
1412 | overload resolution, we cannot yet check either accessibility | |
1413 | or ambiguity -- in either case, the choice of a static member | |
1414 | function might make the usage valid. */ | |
a723baf1 | 1415 | base = lookup_base (context_class, qualifying_scope, |
22854930 PC |
1416 | ba_unique, NULL, tf_none); |
1417 | if (base && base != error_mark_node) | |
9e259dd1 MM |
1418 | { |
1419 | BASELINK_ACCESS_BINFO (decl) = base; | |
91914f0a | 1420 | tree decl_binfo |
9e259dd1 | 1421 | = lookup_base (base, BINFO_TYPE (BASELINK_BINFO (decl)), |
22854930 | 1422 | ba_unique, NULL, tf_none); |
91914f0a PP |
1423 | if (decl_binfo && decl_binfo != error_mark_node) |
1424 | BASELINK_BINFO (decl) = decl_binfo; | |
9e259dd1 MM |
1425 | } |
1426 | } | |
1427 | ||
4643a68e JM |
1428 | if (BASELINK_P (decl)) |
1429 | BASELINK_QUALIFIED_P (decl) = true; | |
1430 | ||
9e259dd1 MM |
1431 | return decl; |
1432 | } | |
1433 | ||
8d08fdba | 1434 | \f |
5cf447db | 1435 | /* Walk the class hierarchy within BINFO, in a depth-first traversal. |
5d5a519f NS |
1436 | PRE_FN is called in preorder, while POST_FN is called in postorder. |
1437 | If PRE_FN returns DFS_SKIP_BASES, child binfos will not be | |
1438 | walked. If PRE_FN or POST_FN returns a different non-NULL value, | |
1439 | that value is immediately returned and the walk is terminated. One | |
1440 | of PRE_FN and POST_FN can be NULL. At each node, PRE_FN and | |
1441 | POST_FN are passed the binfo to examine and the caller's DATA | |
1442 | value. All paths are walked, thus virtual and morally virtual | |
1443 | binfos can be multiply walked. */ | |
d6479fe7 | 1444 | |
bbd15aac | 1445 | tree |
5d5a519f NS |
1446 | dfs_walk_all (tree binfo, tree (*pre_fn) (tree, void *), |
1447 | tree (*post_fn) (tree, void *), void *data) | |
d6479fe7 | 1448 | { |
5d5a519f NS |
1449 | tree rval; |
1450 | unsigned ix; | |
fa743e8c | 1451 | tree base_binfo; |
c8094d83 | 1452 | |
d6479fe7 | 1453 | /* Call the pre-order walking function. */ |
5d5a519f | 1454 | if (pre_fn) |
7d4bdeed | 1455 | { |
5d5a519f NS |
1456 | rval = pre_fn (binfo, data); |
1457 | if (rval) | |
1458 | { | |
1459 | if (rval == dfs_skip_bases) | |
1460 | goto skip_bases; | |
1461 | return rval; | |
1462 | } | |
1463 | } | |
1464 | ||
1465 | /* Find the next child binfo to walk. */ | |
1466 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
1467 | { | |
1468 | rval = dfs_walk_all (base_binfo, pre_fn, post_fn, data); | |
d6479fe7 MM |
1469 | if (rval) |
1470 | return rval; | |
8d08fdba | 1471 | } |
8d08fdba | 1472 | |
5d5a519f NS |
1473 | skip_bases: |
1474 | /* Call the post-order walking function. */ | |
1475 | if (post_fn) | |
5b94d9dd NS |
1476 | { |
1477 | rval = post_fn (binfo, data); | |
1478 | gcc_assert (rval != dfs_skip_bases); | |
1479 | return rval; | |
1480 | } | |
c8094d83 | 1481 | |
5d5a519f NS |
1482 | return NULL_TREE; |
1483 | } | |
1484 | ||
1485 | /* Worker for dfs_walk_once. This behaves as dfs_walk_all, except | |
1486 | that binfos are walked at most once. */ | |
1487 | ||
1488 | static tree | |
1489 | dfs_walk_once_r (tree binfo, tree (*pre_fn) (tree, void *), | |
e448880c JM |
1490 | tree (*post_fn) (tree, void *), hash_set<tree> *pset, |
1491 | void *data) | |
5d5a519f NS |
1492 | { |
1493 | tree rval; | |
1494 | unsigned ix; | |
1495 | tree base_binfo; | |
c8094d83 | 1496 | |
5d5a519f NS |
1497 | /* Call the pre-order walking function. */ |
1498 | if (pre_fn) | |
d6479fe7 | 1499 | { |
5d5a519f NS |
1500 | rval = pre_fn (binfo, data); |
1501 | if (rval) | |
d6479fe7 | 1502 | { |
5d5a519f NS |
1503 | if (rval == dfs_skip_bases) |
1504 | goto skip_bases; | |
c8094d83 | 1505 | |
5d5a519f NS |
1506 | return rval; |
1507 | } | |
1508 | } | |
1509 | ||
1510 | /* Find the next child binfo to walk. */ | |
1511 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
1512 | { | |
1513 | if (BINFO_VIRTUAL_P (base_binfo)) | |
e448880c JM |
1514 | if (pset->add (base_binfo)) |
1515 | continue; | |
c8094d83 | 1516 | |
e448880c | 1517 | rval = dfs_walk_once_r (base_binfo, pre_fn, post_fn, pset, data); |
fa743e8c NS |
1518 | if (rval) |
1519 | return rval; | |
d6479fe7 | 1520 | } |
c8094d83 | 1521 | |
5d5a519f | 1522 | skip_bases: |
d6479fe7 | 1523 | /* Call the post-order walking function. */ |
5d5a519f | 1524 | if (post_fn) |
5b94d9dd NS |
1525 | { |
1526 | rval = post_fn (binfo, data); | |
1527 | gcc_assert (rval != dfs_skip_bases); | |
1528 | return rval; | |
1529 | } | |
c8094d83 | 1530 | |
5d5a519f NS |
1531 | return NULL_TREE; |
1532 | } | |
1533 | ||
5d5a519f NS |
1534 | /* Like dfs_walk_all, except that binfos are not multiply walked. For |
1535 | non-diamond shaped hierarchies this is the same as dfs_walk_all. | |
1536 | For diamond shaped hierarchies we must mark the virtual bases, to | |
1537 | avoid multiple walks. */ | |
d6479fe7 MM |
1538 | |
1539 | tree | |
5d5a519f NS |
1540 | dfs_walk_once (tree binfo, tree (*pre_fn) (tree, void *), |
1541 | tree (*post_fn) (tree, void *), void *data) | |
d6479fe7 | 1542 | { |
12a669d1 | 1543 | static int active = 0; /* We must not be called recursively. */ |
5d5a519f NS |
1544 | tree rval; |
1545 | ||
1546 | gcc_assert (pre_fn || post_fn); | |
12a669d1 NS |
1547 | gcc_assert (!active); |
1548 | active++; | |
c8094d83 | 1549 | |
5d5a519f NS |
1550 | if (!CLASSTYPE_DIAMOND_SHAPED_P (BINFO_TYPE (binfo))) |
1551 | /* We are not diamond shaped, and therefore cannot encounter the | |
1552 | same binfo twice. */ | |
1553 | rval = dfs_walk_all (binfo, pre_fn, post_fn, data); | |
1554 | else | |
1555 | { | |
e448880c JM |
1556 | hash_set<tree> pset; |
1557 | rval = dfs_walk_once_r (binfo, pre_fn, post_fn, &pset, data); | |
5d5a519f | 1558 | } |
12a669d1 NS |
1559 | |
1560 | active--; | |
c8094d83 | 1561 | |
5d5a519f | 1562 | return rval; |
d6479fe7 MM |
1563 | } |
1564 | ||
6936e493 NS |
1565 | /* Worker function for dfs_walk_once_accessible. Behaves like |
1566 | dfs_walk_once_r, except (a) FRIENDS_P is true if special | |
1567 | access given by the current context should be considered, (b) ONCE | |
1568 | indicates whether bases should be marked during traversal. */ | |
1569 | ||
1570 | static tree | |
e448880c | 1571 | dfs_walk_once_accessible_r (tree binfo, bool friends_p, hash_set<tree> *pset, |
6936e493 NS |
1572 | tree (*pre_fn) (tree, void *), |
1573 | tree (*post_fn) (tree, void *), void *data) | |
1574 | { | |
1575 | tree rval = NULL_TREE; | |
1576 | unsigned ix; | |
1577 | tree base_binfo; | |
1578 | ||
1579 | /* Call the pre-order walking function. */ | |
1580 | if (pre_fn) | |
1581 | { | |
1582 | rval = pre_fn (binfo, data); | |
1583 | if (rval) | |
1584 | { | |
1585 | if (rval == dfs_skip_bases) | |
1586 | goto skip_bases; | |
c8094d83 | 1587 | |
6936e493 NS |
1588 | return rval; |
1589 | } | |
1590 | } | |
1591 | ||
1592 | /* Find the next child binfo to walk. */ | |
1593 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
1594 | { | |
e448880c | 1595 | bool mark = pset && BINFO_VIRTUAL_P (base_binfo); |
6936e493 | 1596 | |
e448880c | 1597 | if (mark && pset->contains (base_binfo)) |
6936e493 | 1598 | continue; |
c8094d83 | 1599 | |
6936e493 | 1600 | /* If the base is inherited via private or protected |
0cbd7506 MS |
1601 | inheritance, then we can't see it, unless we are a friend of |
1602 | the current binfo. */ | |
a5201a91 MM |
1603 | if (BINFO_BASE_ACCESS (binfo, ix) != access_public_node) |
1604 | { | |
1605 | tree scope; | |
1606 | if (!friends_p) | |
1607 | continue; | |
1608 | scope = current_scope (); | |
c8094d83 | 1609 | if (!scope |
a5201a91 MM |
1610 | || TREE_CODE (scope) == NAMESPACE_DECL |
1611 | || !is_friend (BINFO_TYPE (binfo), scope)) | |
1612 | continue; | |
1613 | } | |
6936e493 NS |
1614 | |
1615 | if (mark) | |
e448880c | 1616 | pset->add (base_binfo); |
6936e493 | 1617 | |
e448880c | 1618 | rval = dfs_walk_once_accessible_r (base_binfo, friends_p, pset, |
6936e493 NS |
1619 | pre_fn, post_fn, data); |
1620 | if (rval) | |
1621 | return rval; | |
1622 | } | |
c8094d83 | 1623 | |
6936e493 NS |
1624 | skip_bases: |
1625 | /* Call the post-order walking function. */ | |
1626 | if (post_fn) | |
5b94d9dd NS |
1627 | { |
1628 | rval = post_fn (binfo, data); | |
1629 | gcc_assert (rval != dfs_skip_bases); | |
1630 | return rval; | |
1631 | } | |
c8094d83 | 1632 | |
6936e493 NS |
1633 | return NULL_TREE; |
1634 | } | |
1635 | ||
1636 | /* Like dfs_walk_once except that only accessible bases are walked. | |
1637 | FRIENDS_P indicates whether friendship of the local context | |
1638 | should be considered when determining accessibility. */ | |
1639 | ||
1640 | static tree | |
1641 | dfs_walk_once_accessible (tree binfo, bool friends_p, | |
1642 | tree (*pre_fn) (tree, void *), | |
1643 | tree (*post_fn) (tree, void *), void *data) | |
1644 | { | |
e448880c JM |
1645 | hash_set<tree> *pset = NULL; |
1646 | if (CLASSTYPE_DIAMOND_SHAPED_P (BINFO_TYPE (binfo))) | |
1647 | pset = new hash_set<tree>; | |
1648 | tree rval = dfs_walk_once_accessible_r (binfo, friends_p, pset, | |
6936e493 | 1649 | pre_fn, post_fn, data); |
c8094d83 | 1650 | |
e448880c JM |
1651 | if (pset) |
1652 | delete pset; | |
6936e493 NS |
1653 | return rval; |
1654 | } | |
1655 | ||
10791753 DM |
1656 | /* Return true iff the code of T is CODE, and it has compatible |
1657 | type with TYPE. */ | |
1658 | ||
1659 | static bool | |
1660 | matches_code_and_type_p (tree t, enum tree_code code, tree type) | |
1661 | { | |
1662 | if (TREE_CODE (t) != code) | |
1663 | return false; | |
1664 | if (!cxx_types_compatible_p (TREE_TYPE (t), type)) | |
1665 | return false; | |
1666 | return true; | |
1667 | } | |
1668 | ||
1669 | /* Subroutine of direct_accessor_p and reference_accessor_p. | |
1670 | Determine if COMPONENT_REF is a simple field lookup of this->FIELD_DECL. | |
1671 | We expect a tree of the form: | |
1672 | <component_ref: | |
1673 | <indirect_ref:S> | |
1674 | <nop_expr:P* | |
1675 | <parm_decl (this)> | |
1676 | <field_decl (FIELD_DECL)>>>. */ | |
1677 | ||
1678 | static bool | |
1679 | field_access_p (tree component_ref, tree field_decl, tree field_type) | |
1680 | { | |
1681 | if (!matches_code_and_type_p (component_ref, COMPONENT_REF, field_type)) | |
1682 | return false; | |
1683 | ||
1684 | tree indirect_ref = TREE_OPERAND (component_ref, 0); | |
a7f8415c | 1685 | if (!INDIRECT_REF_P (indirect_ref)) |
10791753 DM |
1686 | return false; |
1687 | ||
1688 | tree ptr = STRIP_NOPS (TREE_OPERAND (indirect_ref, 0)); | |
1689 | if (!is_this_parameter (ptr)) | |
1690 | return false; | |
1691 | ||
1692 | /* Must access the correct field. */ | |
1693 | if (TREE_OPERAND (component_ref, 1) != field_decl) | |
1694 | return false; | |
1695 | return true; | |
1696 | } | |
1697 | ||
1698 | /* Subroutine of field_accessor_p. | |
1699 | ||
1700 | Assuming that INIT_EXPR has already had its code and type checked, | |
1701 | determine if it is a simple accessor for FIELD_DECL | |
1702 | (of type FIELD_TYPE). | |
1703 | ||
1704 | Specifically, a simple accessor within struct S of the form: | |
1705 | T get_field () { return m_field; } | |
5afef8b1 | 1706 | should have a constexpr_fn_retval (saved_tree) of the form: |
10791753 DM |
1707 | <init_expr:T |
1708 | <result_decl:T | |
1709 | <nop_expr:T | |
1710 | <component_ref: | |
1711 | <indirect_ref:S> | |
1712 | <nop_expr:P* | |
1713 | <parm_decl (this)> | |
5afef8b1 | 1714 | <field_decl (FIELD_DECL)>>>>>. */ |
10791753 DM |
1715 | |
1716 | static bool | |
1717 | direct_accessor_p (tree init_expr, tree field_decl, tree field_type) | |
1718 | { | |
1719 | tree result_decl = TREE_OPERAND (init_expr, 0); | |
1720 | if (!matches_code_and_type_p (result_decl, RESULT_DECL, field_type)) | |
1721 | return false; | |
1722 | ||
1723 | tree component_ref = STRIP_NOPS (TREE_OPERAND (init_expr, 1)); | |
1724 | if (!field_access_p (component_ref, field_decl, field_type)) | |
1725 | return false; | |
1726 | ||
1727 | return true; | |
1728 | } | |
1729 | ||
1730 | /* Subroutine of field_accessor_p. | |
1731 | ||
1732 | Assuming that INIT_EXPR has already had its code and type checked, | |
1733 | determine if it is a "reference" accessor for FIELD_DECL | |
1734 | (of type FIELD_REFERENCE_TYPE). | |
1735 | ||
1736 | Specifically, a simple accessor within struct S of the form: | |
1737 | T& get_field () { return m_field; } | |
5afef8b1 | 1738 | should have a constexpr_fn_retval (saved_tree) of the form: |
10791753 DM |
1739 | <init_expr:T& |
1740 | <result_decl:T& | |
1741 | <nop_expr: T& | |
1742 | <addr_expr: T* | |
1743 | <component_ref:T | |
1744 | <indirect_ref:S | |
1745 | <nop_expr | |
1746 | <parm_decl (this)>> | |
1747 | <field (FIELD_DECL)>>>>>>. */ | |
1748 | static bool | |
1749 | reference_accessor_p (tree init_expr, tree field_decl, tree field_type, | |
1750 | tree field_reference_type) | |
1751 | { | |
1752 | tree result_decl = TREE_OPERAND (init_expr, 0); | |
1753 | if (!matches_code_and_type_p (result_decl, RESULT_DECL, field_reference_type)) | |
1754 | return false; | |
1755 | ||
1756 | tree field_pointer_type = build_pointer_type (field_type); | |
1757 | tree addr_expr = STRIP_NOPS (TREE_OPERAND (init_expr, 1)); | |
1758 | if (!matches_code_and_type_p (addr_expr, ADDR_EXPR, field_pointer_type)) | |
1759 | return false; | |
1760 | ||
1761 | tree component_ref = STRIP_NOPS (TREE_OPERAND (addr_expr, 0)); | |
1762 | ||
1763 | if (!field_access_p (component_ref, field_decl, field_type)) | |
1764 | return false; | |
1765 | ||
1766 | return true; | |
1767 | } | |
1768 | ||
1769 | /* Return true if FN is an accessor method for FIELD_DECL. | |
1770 | i.e. a method of the form { return FIELD; }, with no | |
1771 | conversions. | |
1772 | ||
1773 | If CONST_P, then additionally require that FN be a const | |
1774 | method. */ | |
1775 | ||
1776 | static bool | |
1777 | field_accessor_p (tree fn, tree field_decl, bool const_p) | |
1778 | { | |
1779 | if (TREE_CODE (fn) != FUNCTION_DECL) | |
1780 | return false; | |
1781 | ||
1782 | /* We don't yet support looking up static data, just fields. */ | |
1783 | if (TREE_CODE (field_decl) != FIELD_DECL) | |
1784 | return false; | |
1785 | ||
1786 | tree fntype = TREE_TYPE (fn); | |
1787 | if (TREE_CODE (fntype) != METHOD_TYPE) | |
1788 | return false; | |
1789 | ||
1790 | /* If the field is accessed via a const "this" argument, verify | |
1791 | that the "this" parameter is const. */ | |
1792 | if (const_p) | |
1793 | { | |
2a80d3ae DM |
1794 | tree this_class = class_of_this_parm (fntype); |
1795 | if (!TYPE_READONLY (this_class)) | |
10791753 DM |
1796 | return false; |
1797 | } | |
1798 | ||
1799 | tree saved_tree = DECL_SAVED_TREE (fn); | |
1800 | ||
1801 | if (saved_tree == NULL_TREE) | |
1802 | return false; | |
1803 | ||
5afef8b1 DM |
1804 | /* Attempt to extract a single return value from the function, |
1805 | if it has one. */ | |
1806 | tree retval = constexpr_fn_retval (saved_tree); | |
1807 | if (retval == NULL_TREE || retval == error_mark_node) | |
10791753 | 1808 | return false; |
5afef8b1 DM |
1809 | /* Require an INIT_EXPR. */ |
1810 | if (TREE_CODE (retval) != INIT_EXPR) | |
10791753 | 1811 | return false; |
5afef8b1 | 1812 | tree init_expr = retval; |
10791753 DM |
1813 | |
1814 | /* Determine if this is a simple accessor within struct S of the form: | |
1815 | T get_field () { return m_field; }. */ | |
5afef8b1 | 1816 | tree field_type = TREE_TYPE (field_decl); |
10791753 DM |
1817 | if (cxx_types_compatible_p (TREE_TYPE (init_expr), field_type)) |
1818 | return direct_accessor_p (init_expr, field_decl, field_type); | |
1819 | ||
1820 | /* Failing that, determine if it is an accessor of the form: | |
1821 | T& get_field () { return m_field; }. */ | |
1822 | tree field_reference_type = cp_build_reference_type (field_type, false); | |
1823 | if (cxx_types_compatible_p (TREE_TYPE (init_expr), field_reference_type)) | |
1824 | return reference_accessor_p (init_expr, field_decl, field_type, | |
1825 | field_reference_type); | |
1826 | ||
1827 | return false; | |
1828 | } | |
1829 | ||
1830 | /* Callback data for dfs_locate_field_accessor_pre. */ | |
1831 | ||
6c1dae73 | 1832 | class locate_field_data |
10791753 | 1833 | { |
6c1dae73 | 1834 | public: |
10791753 DM |
1835 | locate_field_data (tree field_decl_, bool const_p_) |
1836 | : field_decl (field_decl_), const_p (const_p_) {} | |
1837 | ||
1838 | tree field_decl; | |
1839 | bool const_p; | |
1840 | }; | |
1841 | ||
1842 | /* Return a FUNCTION_DECL that is an "accessor" method for DATA, a FIELD_DECL, | |
1843 | callable via binfo, if one exists, otherwise return NULL_TREE. | |
1844 | ||
1845 | Callback for dfs_walk_once_accessible for use within | |
1846 | locate_field_accessor. */ | |
1847 | ||
1848 | static tree | |
1849 | dfs_locate_field_accessor_pre (tree binfo, void *data) | |
1850 | { | |
1851 | locate_field_data *lfd = (locate_field_data *)data; | |
1852 | tree type = BINFO_TYPE (binfo); | |
1853 | ||
783dc739 | 1854 | vec<tree, va_gc> *member_vec; |
10791753 DM |
1855 | tree fn; |
1856 | size_t i; | |
1857 | ||
1858 | if (!CLASS_TYPE_P (type)) | |
1859 | return NULL_TREE; | |
1860 | ||
783dc739 NS |
1861 | member_vec = CLASSTYPE_MEMBER_VEC (type); |
1862 | if (!member_vec) | |
10791753 DM |
1863 | return NULL_TREE; |
1864 | ||
783dc739 | 1865 | for (i = 0; vec_safe_iterate (member_vec, i, &fn); ++i) |
10791753 DM |
1866 | if (fn) |
1867 | if (field_accessor_p (fn, lfd->field_decl, lfd->const_p)) | |
1868 | return fn; | |
1869 | ||
1870 | return NULL_TREE; | |
1871 | } | |
1872 | ||
1873 | /* Return a FUNCTION_DECL that is an "accessor" method for FIELD_DECL, | |
1874 | callable via BASETYPE_PATH, if one exists, otherwise return NULL_TREE. */ | |
1875 | ||
1876 | tree | |
1877 | locate_field_accessor (tree basetype_path, tree field_decl, bool const_p) | |
1878 | { | |
1879 | if (TREE_CODE (basetype_path) != TREE_BINFO) | |
1880 | return NULL_TREE; | |
1881 | ||
1882 | /* Walk the hierarchy, looking for a method of some base class that allows | |
1883 | access to the field. */ | |
1884 | locate_field_data lfd (field_decl, const_p); | |
1885 | return dfs_walk_once_accessible (basetype_path, /*friends=*/true, | |
1886 | dfs_locate_field_accessor_pre, | |
1887 | NULL, &lfd); | |
1888 | } | |
1889 | ||
78f7607d MP |
1890 | /* Check throw specifier of OVERRIDER is at least as strict as |
1891 | the one of BASEFN. */ | |
1892 | ||
1893 | bool | |
1894 | maybe_check_overriding_exception_spec (tree overrider, tree basefn) | |
1895 | { | |
1896 | maybe_instantiate_noexcept (basefn); | |
1897 | maybe_instantiate_noexcept (overrider); | |
1898 | tree base_throw = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (basefn)); | |
1899 | tree over_throw = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (overrider)); | |
1900 | ||
1901 | if (DECL_INVALID_OVERRIDER_P (overrider)) | |
1902 | return true; | |
1903 | ||
1904 | /* Can't check this yet. Pretend this is fine and let | |
1905 | noexcept_override_late_checks check this later. */ | |
1906 | if (UNPARSED_NOEXCEPT_SPEC_P (base_throw) | |
1907 | || UNPARSED_NOEXCEPT_SPEC_P (over_throw)) | |
1908 | return true; | |
1909 | ||
1910 | if (!comp_except_specs (base_throw, over_throw, ce_derived)) | |
1911 | { | |
1912 | auto_diagnostic_group d; | |
1913 | error ("looser exception specification on overriding virtual function " | |
1914 | "%q+#F", overrider); | |
1915 | inform (DECL_SOURCE_LOCATION (basefn), | |
1916 | "overridden function is %q#F", basefn); | |
1917 | DECL_INVALID_OVERRIDER_P (overrider) = 1; | |
1918 | return false; | |
1919 | } | |
1920 | return true; | |
1921 | } | |
1922 | ||
4cc1d462 NS |
1923 | /* Check that virtual overrider OVERRIDER is acceptable for base function |
1924 | BASEFN. Issue diagnostic, and return zero, if unacceptable. */ | |
1925 | ||
af746697 | 1926 | static int |
86ac0575 | 1927 | check_final_overrider (tree overrider, tree basefn) |
4cc1d462 NS |
1928 | { |
1929 | tree over_type = TREE_TYPE (overrider); | |
1930 | tree base_type = TREE_TYPE (basefn); | |
79d8a272 JM |
1931 | tree over_return = fndecl_declared_return_type (overrider); |
1932 | tree base_return = fndecl_declared_return_type (basefn); | |
10261728 | 1933 | |
4977bab6 | 1934 | int fail = 0; |
58ec3cc5 MM |
1935 | |
1936 | if (DECL_INVALID_OVERRIDER_P (overrider)) | |
1937 | return 0; | |
1938 | ||
4cc1d462 NS |
1939 | if (same_type_p (base_return, over_return)) |
1940 | /* OK */; | |
4977bab6 ZW |
1941 | else if ((CLASS_TYPE_P (over_return) && CLASS_TYPE_P (base_return)) |
1942 | || (TREE_CODE (base_return) == TREE_CODE (over_return) | |
71a93b08 | 1943 | && INDIRECT_TYPE_P (base_return))) |
4cc1d462 | 1944 | { |
9bcb9aae | 1945 | /* Potentially covariant. */ |
4977bab6 | 1946 | unsigned base_quals, over_quals; |
c8094d83 | 1947 | |
71a93b08 | 1948 | fail = !INDIRECT_TYPE_P (base_return); |
4977bab6 ZW |
1949 | if (!fail) |
1950 | { | |
d04b0c75 PP |
1951 | if (cp_type_quals (base_return) != cp_type_quals (over_return)) |
1952 | fail = 1; | |
1953 | ||
1954 | if (TYPE_REF_P (base_return) | |
1955 | && (TYPE_REF_IS_RVALUE (base_return) | |
1956 | != TYPE_REF_IS_RVALUE (over_return))) | |
1957 | fail = 1; | |
c8094d83 | 1958 | |
4977bab6 ZW |
1959 | base_return = TREE_TYPE (base_return); |
1960 | over_return = TREE_TYPE (over_return); | |
1961 | } | |
1962 | base_quals = cp_type_quals (base_return); | |
1963 | over_quals = cp_type_quals (over_return); | |
1964 | ||
1965 | if ((base_quals & over_quals) != over_quals) | |
1966 | fail = 1; | |
c8094d83 | 1967 | |
4977bab6 ZW |
1968 | if (CLASS_TYPE_P (base_return) && CLASS_TYPE_P (over_return)) |
1969 | { | |
38ffa828 JM |
1970 | /* Strictly speaking, the standard requires the return type to be |
1971 | complete even if it only differs in cv-quals, but that seems | |
1972 | like a bug in the wording. */ | |
22854930 PC |
1973 | if (!same_type_ignoring_top_level_qualifiers_p (base_return, |
1974 | over_return)) | |
38ffa828 JM |
1975 | { |
1976 | tree binfo = lookup_base (over_return, base_return, | |
22854930 | 1977 | ba_check, NULL, tf_none); |
4cc1d462 | 1978 | |
22854930 | 1979 | if (!binfo || binfo == error_mark_node) |
38ffa828 JM |
1980 | fail = 1; |
1981 | } | |
4977bab6 | 1982 | } |
53db1bc0 JM |
1983 | else if (can_convert_standard (TREE_TYPE (base_type), |
1984 | TREE_TYPE (over_type), | |
1985 | tf_warning_or_error)) | |
4977bab6 ZW |
1986 | /* GNU extension, allow trivial pointer conversions such as |
1987 | converting to void *, or qualification conversion. */ | |
4cc1d462 | 1988 | { |
097f82ec | 1989 | auto_diagnostic_group d; |
53db1bc0 JM |
1990 | if (pedwarn (DECL_SOURCE_LOCATION (overrider), 0, |
1991 | "invalid covariant return type for %q#D", overrider)) | |
1992 | inform (DECL_SOURCE_LOCATION (basefn), | |
d555040f | 1993 | "overridden function is %q#D", basefn); |
4cc1d462 | 1994 | } |
4977bab6 ZW |
1995 | else |
1996 | fail = 2; | |
4cc1d462 | 1997 | } |
4977bab6 ZW |
1998 | else |
1999 | fail = 2; | |
2000 | if (!fail) | |
2001 | /* OK */; | |
4977bab6 | 2002 | else |
4cc1d462 | 2003 | { |
e6321c45 | 2004 | auto_diagnostic_group d; |
4977bab6 | 2005 | if (fail == 1) |
e6321c45 | 2006 | error ("invalid covariant return type for %q+#D", overrider); |
4977bab6 | 2007 | else |
e6321c45 JM |
2008 | error ("conflicting return type specified for %q+#D", overrider); |
2009 | inform (DECL_SOURCE_LOCATION (basefn), | |
2010 | "overridden function is %q#D", basefn); | |
58ec3cc5 | 2011 | DECL_INVALID_OVERRIDER_P (overrider) = 1; |
4cc1d462 NS |
2012 | return 0; |
2013 | } | |
c8094d83 | 2014 | |
78f7607d MP |
2015 | if (!maybe_check_overriding_exception_spec (overrider, basefn)) |
2016 | return 0; | |
c8094d83 | 2017 | |
b8fd7909 JM |
2018 | /* Check for conflicting type attributes. But leave transaction_safe for |
2019 | set_one_vmethod_tm_attributes. */ | |
2020 | if (!comp_type_attributes (over_type, base_type) | |
2021 | && !tx_safe_fn_type_p (base_type) | |
2022 | && !tx_safe_fn_type_p (over_type)) | |
18ff3013 | 2023 | { |
097f82ec | 2024 | auto_diagnostic_group d; |
18ff3013 | 2025 | error ("conflicting type attributes specified for %q+#D", overrider); |
d555040f VR |
2026 | inform (DECL_SOURCE_LOCATION (basefn), |
2027 | "overridden function is %q#D", basefn); | |
18ff3013 DS |
2028 | DECL_INVALID_OVERRIDER_P (overrider) = 1; |
2029 | return 0; | |
2030 | } | |
2031 | ||
e6321c45 JM |
2032 | /* A consteval virtual function shall not override a virtual function that is |
2033 | not consteval. A consteval virtual function shall not be overridden by a | |
2034 | virtual function that is not consteval. */ | |
2035 | if (DECL_IMMEDIATE_FUNCTION_P (overrider) | |
2036 | != DECL_IMMEDIATE_FUNCTION_P (basefn)) | |
2037 | { | |
2038 | auto_diagnostic_group d; | |
2039 | if (DECL_IMMEDIATE_FUNCTION_P (overrider)) | |
2040 | error ("%<consteval%> function %q+D overriding non-%<consteval%> " | |
2041 | "function", overrider); | |
2042 | else | |
2043 | error ("non-%<consteval%> function %q+D overriding %<consteval%> " | |
2044 | "function", overrider); | |
2045 | inform (DECL_SOURCE_LOCATION (basefn), | |
2046 | "overridden function is %qD", basefn); | |
2047 | DECL_INVALID_OVERRIDER_P (overrider) = 1; | |
2048 | return 0; | |
2049 | } | |
2050 | ||
b8fd7909 JM |
2051 | /* A function declared transaction_safe_dynamic that overrides a function |
2052 | declared transaction_safe (but not transaction_safe_dynamic) is | |
2053 | ill-formed. */ | |
2054 | if (tx_safe_fn_type_p (base_type) | |
2055 | && lookup_attribute ("transaction_safe_dynamic", | |
2056 | DECL_ATTRIBUTES (overrider)) | |
2057 | && !lookup_attribute ("transaction_safe_dynamic", | |
2058 | DECL_ATTRIBUTES (basefn))) | |
2059 | { | |
097f82ec | 2060 | auto_diagnostic_group d; |
b8fd7909 JM |
2061 | error_at (DECL_SOURCE_LOCATION (overrider), |
2062 | "%qD declared %<transaction_safe_dynamic%>", overrider); | |
2063 | inform (DECL_SOURCE_LOCATION (basefn), | |
2064 | "overriding %qD declared %<transaction_safe%>", basefn); | |
2065 | } | |
2066 | ||
b87d79e6 JM |
2067 | if (DECL_DELETED_FN (basefn) != DECL_DELETED_FN (overrider)) |
2068 | { | |
2069 | if (DECL_DELETED_FN (overrider)) | |
2070 | { | |
097f82ec | 2071 | auto_diagnostic_group d; |
d555040f VR |
2072 | error ("deleted function %q+D overriding non-deleted function", |
2073 | overrider); | |
2074 | inform (DECL_SOURCE_LOCATION (basefn), | |
2075 | "overridden function is %qD", basefn); | |
ac177431 | 2076 | maybe_explain_implicit_delete (overrider); |
b87d79e6 JM |
2077 | } |
2078 | else | |
2079 | { | |
097f82ec | 2080 | auto_diagnostic_group d; |
d555040f VR |
2081 | error ("non-deleted function %q+D overriding deleted function", |
2082 | overrider); | |
2083 | inform (DECL_SOURCE_LOCATION (basefn), | |
2084 | "overridden function is %qD", basefn); | |
b87d79e6 JM |
2085 | } |
2086 | return 0; | |
2087 | } | |
b5da71d4 VV |
2088 | if (DECL_FINAL_P (basefn)) |
2089 | { | |
097f82ec | 2090 | auto_diagnostic_group d; |
d555040f VR |
2091 | error ("virtual function %q+D overriding final function", overrider); |
2092 | inform (DECL_SOURCE_LOCATION (basefn), | |
2093 | "overridden function is %qD", basefn); | |
b5da71d4 VV |
2094 | return 0; |
2095 | } | |
4cc1d462 NS |
2096 | return 1; |
2097 | } | |
2098 | ||
cbb40945 NS |
2099 | /* Given a class TYPE, and a function decl FNDECL, look for |
2100 | virtual functions in TYPE's hierarchy which FNDECL overrides. | |
2101 | We do not look in TYPE itself, only its bases. | |
c8094d83 | 2102 | |
838dfd8a | 2103 | Returns nonzero, if we find any. Set FNDECL's DECL_VIRTUAL_P, if we |
cbb40945 | 2104 | find that it overrides anything. |
c8094d83 | 2105 | |
cbb40945 NS |
2106 | We check that every function which is overridden, is correctly |
2107 | overridden. */ | |
e92cc029 | 2108 | |
cbb40945 | 2109 | int |
86ac0575 | 2110 | look_for_overrides (tree type, tree fndecl) |
8d08fdba | 2111 | { |
cbb40945 | 2112 | tree binfo = TYPE_BINFO (type); |
fa743e8c | 2113 | tree base_binfo; |
cbb40945 NS |
2114 | int ix; |
2115 | int found = 0; | |
8d08fdba | 2116 | |
e52a5db6 JM |
2117 | /* A constructor for a class T does not override a function T |
2118 | in a base class. */ | |
2119 | if (DECL_CONSTRUCTOR_P (fndecl)) | |
2120 | return 0; | |
2121 | ||
fa743e8c | 2122 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) |
cbb40945 | 2123 | { |
fa743e8c | 2124 | tree basetype = BINFO_TYPE (base_binfo); |
c8094d83 | 2125 | |
cbb40945 | 2126 | if (TYPE_POLYMORPHIC_P (basetype)) |
0cbd7506 | 2127 | found += look_for_overrides_r (basetype, fndecl); |
cbb40945 NS |
2128 | } |
2129 | return found; | |
2130 | } | |
5e795528 | 2131 | |
548502d3 MM |
2132 | /* Look in TYPE for virtual functions with the same signature as |
2133 | FNDECL. */ | |
5e795528 | 2134 | |
d0cd8b44 | 2135 | tree |
86ac0575 | 2136 | look_for_overrides_here (tree type, tree fndecl) |
cbb40945 | 2137 | { |
527b7b19 | 2138 | tree ovl = get_class_binding (type, DECL_NAME (fndecl)); |
d0cd8b44 | 2139 | |
2401ffc3 NS |
2140 | for (ovl_iterator iter (ovl); iter; ++iter) |
2141 | { | |
2142 | tree fn = *iter; | |
c8094d83 | 2143 | |
2401ffc3 NS |
2144 | if (!DECL_VIRTUAL_P (fn)) |
2145 | /* Not a virtual. */; | |
2146 | else if (DECL_CONTEXT (fn) != type) | |
2147 | /* Introduced with a using declaration. */; | |
2148 | else if (DECL_STATIC_FUNCTION_P (fndecl)) | |
2149 | { | |
2150 | tree btypes = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
2151 | tree dtypes = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
2152 | if (compparms (TREE_CHAIN (btypes), dtypes)) | |
2153 | return fn; | |
2154 | } | |
2155 | else if (same_signature_p (fndecl, fn)) | |
2156 | return fn; | |
2157 | } | |
d0cd8b44 | 2158 | |
d0cd8b44 JM |
2159 | return NULL_TREE; |
2160 | } | |
e0fff4b3 | 2161 | |
d0cd8b44 | 2162 | /* Look in TYPE for virtual functions overridden by FNDECL. Check both |
c6002625 | 2163 | TYPE itself and its bases. */ |
d0cd8b44 JM |
2164 | |
2165 | static int | |
86ac0575 | 2166 | look_for_overrides_r (tree type, tree fndecl) |
d0cd8b44 JM |
2167 | { |
2168 | tree fn = look_for_overrides_here (type, fndecl); | |
2169 | if (fn) | |
2170 | { | |
2171 | if (DECL_STATIC_FUNCTION_P (fndecl)) | |
2172 | { | |
2173 | /* A static member function cannot match an inherited | |
2174 | virtual member function. */ | |
097f82ec | 2175 | auto_diagnostic_group d; |
dee15844 JM |
2176 | error ("%q+#D cannot be declared", fndecl); |
2177 | error (" since %q+#D declared in base class", fn); | |
d0cd8b44 JM |
2178 | } |
2179 | else | |
2180 | { | |
2181 | /* It's definitely virtual, even if not explicitly set. */ | |
2182 | DECL_VIRTUAL_P (fndecl) = 1; | |
2183 | check_final_overrider (fndecl, fn); | |
8d08fdba | 2184 | } |
d0cd8b44 | 2185 | return 1; |
8d08fdba | 2186 | } |
d0cd8b44 | 2187 | |
cbb40945 NS |
2188 | /* We failed to find one declared in this class. Look in its bases. */ |
2189 | return look_for_overrides (type, fndecl); | |
8d08fdba MS |
2190 | } |
2191 | ||
99a6c6f4 MM |
2192 | /* Called via dfs_walk from dfs_get_pure_virtuals. */ |
2193 | ||
2194 | static tree | |
86ac0575 | 2195 | dfs_get_pure_virtuals (tree binfo, void *data) |
99a6c6f4 | 2196 | { |
174eceea MM |
2197 | tree type = (tree) data; |
2198 | ||
99a6c6f4 MM |
2199 | /* We're not interested in primary base classes; the derived class |
2200 | of which they are a primary base will contain the information we | |
2201 | need. */ | |
9965d119 | 2202 | if (!BINFO_PRIMARY_P (binfo)) |
8926095f | 2203 | { |
07b7a812 | 2204 | tree virtuals; |
c8094d83 | 2205 | |
da3d4dfa | 2206 | for (virtuals = BINFO_VIRTUALS (binfo); |
99a6c6f4 MM |
2207 | virtuals; |
2208 | virtuals = TREE_CHAIN (virtuals)) | |
31f8e4f3 | 2209 | if (DECL_PURE_VIRTUAL_P (BV_FN (virtuals))) |
9771b263 | 2210 | vec_safe_push (CLASSTYPE_PURE_VIRTUALS (type), BV_FN (virtuals)); |
99a6c6f4 | 2211 | } |
8d08fdba | 2212 | |
99a6c6f4 | 2213 | return NULL_TREE; |
8926095f MS |
2214 | } |
2215 | ||
fee7654e | 2216 | /* Set CLASSTYPE_PURE_VIRTUALS for TYPE. */ |
e92cc029 | 2217 | |
fee7654e | 2218 | void |
86ac0575 | 2219 | get_pure_virtuals (tree type) |
8926095f | 2220 | { |
99a6c6f4 MM |
2221 | /* Clear the CLASSTYPE_PURE_VIRTUALS list; whatever is already there |
2222 | is going to be overridden. */ | |
585b44d3 | 2223 | CLASSTYPE_PURE_VIRTUALS (type) = NULL; |
99a6c6f4 MM |
2224 | /* Now, run through all the bases which are not primary bases, and |
2225 | collect the pure virtual functions. We look at the vtable in | |
2226 | each class to determine what pure virtual functions are present. | |
2227 | (A primary base is not interesting because the derived class of | |
2228 | which it is a primary base will contain vtable entries for the | |
2229 | pure virtuals in the base class. */ | |
5d5a519f | 2230 | dfs_walk_once (TYPE_BINFO (type), NULL, dfs_get_pure_virtuals, type); |
8d08fdba | 2231 | } |
8d08fdba | 2232 | \f |
ae673f14 JM |
2233 | /* Debug info for C++ classes can get very large; try to avoid |
2234 | emitting it everywhere. | |
2235 | ||
50e159f6 JM |
2236 | Note that this optimization wins even when the target supports |
2237 | BINCL (if only slightly), and reduces the amount of work for the | |
2238 | linker. */ | |
ae673f14 JM |
2239 | |
2240 | void | |
86ac0575 | 2241 | maybe_suppress_debug_info (tree t) |
ae673f14 | 2242 | { |
f8ca7e49 | 2243 | if (write_symbols == NO_DEBUG) |
ae673f14 JM |
2244 | return; |
2245 | ||
50e159f6 JM |
2246 | /* We might have set this earlier in cp_finish_decl. */ |
2247 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t)) = 0; | |
2248 | ||
e713adf6 CD |
2249 | /* Always emit the information for each class every time. */ |
2250 | if (flag_emit_class_debug_always) | |
2251 | return; | |
2252 | ||
ae673f14 JM |
2253 | /* If we already know how we're handling this class, handle debug info |
2254 | the same way. */ | |
3ae18eaf JM |
2255 | if (CLASSTYPE_INTERFACE_KNOWN (t)) |
2256 | { | |
2257 | if (CLASSTYPE_INTERFACE_ONLY (t)) | |
2258 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t)) = 1; | |
2259 | /* else don't set it. */ | |
2260 | } | |
bbd15aac MM |
2261 | /* If the class has a vtable, write out the debug info along with |
2262 | the vtable. */ | |
2263 | else if (TYPE_CONTAINS_VPTR_P (t)) | |
ae673f14 JM |
2264 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t)) = 1; |
2265 | ||
2266 | /* Otherwise, just emit the debug info normally. */ | |
2267 | } | |
2268 | ||
6db20143 JM |
2269 | /* Note that we want debugging information for a base class of a class |
2270 | whose vtable is being emitted. Normally, this would happen because | |
2271 | calling the constructor for a derived class implies calling the | |
2272 | constructors for all bases, which involve initializing the | |
2273 | appropriate vptr with the vtable for the base class; but in the | |
2274 | presence of optimization, this initialization may be optimized | |
2275 | away, so we tell finish_vtable_vardecl that we want the debugging | |
2276 | information anyway. */ | |
2277 | ||
2278 | static tree | |
12308bc6 | 2279 | dfs_debug_mark (tree binfo, void * /*data*/) |
6db20143 JM |
2280 | { |
2281 | tree t = BINFO_TYPE (binfo); | |
2282 | ||
5d5a519f NS |
2283 | if (CLASSTYPE_DEBUG_REQUESTED (t)) |
2284 | return dfs_skip_bases; | |
2285 | ||
6db20143 JM |
2286 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; |
2287 | ||
2288 | return NULL_TREE; | |
2289 | } | |
2290 | ||
6db20143 JM |
2291 | /* Write out the debugging information for TYPE, whose vtable is being |
2292 | emitted. Also walk through our bases and note that we want to | |
2293 | write out information for them. This avoids the problem of not | |
2294 | writing any debug info for intermediate basetypes whose | |
2295 | constructors, and thus the references to their vtables, and thus | |
2296 | the vtables themselves, were optimized away. */ | |
8d08fdba MS |
2297 | |
2298 | void | |
86ac0575 | 2299 | note_debug_info_needed (tree type) |
8d08fdba | 2300 | { |
15f1a795 JM |
2301 | if (TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type))) |
2302 | { | |
2303 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type)) = 0; | |
056a17ee | 2304 | rest_of_type_compilation (type, namespace_bindings_p ()); |
15f1a795 | 2305 | } |
d2e5ee5c | 2306 | |
5d5a519f | 2307 | dfs_walk_all (TYPE_BINFO (type), dfs_debug_mark, NULL, 0); |
8d08fdba MS |
2308 | } |
2309 | \f | |
8f2a734f | 2310 | /* Helper for lookup_conversions_r. TO_TYPE is the type converted to |
9c763d19 KH |
2311 | by a conversion op in base BINFO. VIRTUAL_DEPTH is nonzero if |
2312 | BINFO is morally virtual, and VIRTUALNESS is nonzero if virtual | |
8f2a734f NS |
2313 | bases have been encountered already in the tree walk. PARENT_CONVS |
2314 | is the list of lists of conversion functions that could hide CONV | |
2315 | and OTHER_CONVS is the list of lists of conversion functions that | |
2316 | could hide or be hidden by CONV, should virtualness be involved in | |
2317 | the hierarchy. Merely checking the conversion op's name is not | |
2318 | enough because two conversion operators to the same type can have | |
9c763d19 | 2319 | different names. Return nonzero if we are visible. */ |
8f2a734f NS |
2320 | |
2321 | static int | |
2322 | check_hidden_convs (tree binfo, int virtual_depth, int virtualness, | |
2323 | tree to_type, tree parent_convs, tree other_convs) | |
2324 | { | |
2325 | tree level, probe; | |
2326 | ||
2327 | /* See if we are hidden by a parent conversion. */ | |
2328 | for (level = parent_convs; level; level = TREE_CHAIN (level)) | |
2329 | for (probe = TREE_VALUE (level); probe; probe = TREE_CHAIN (probe)) | |
2330 | if (same_type_p (to_type, TREE_TYPE (probe))) | |
2331 | return 0; | |
2332 | ||
2333 | if (virtual_depth || virtualness) | |
2334 | { | |
2335 | /* In a virtual hierarchy, we could be hidden, or could hide a | |
0cbd7506 | 2336 | conversion function on the other_convs list. */ |
8f2a734f NS |
2337 | for (level = other_convs; level; level = TREE_CHAIN (level)) |
2338 | { | |
2339 | int we_hide_them; | |
2340 | int they_hide_us; | |
2341 | tree *prev, other; | |
c8094d83 | 2342 | |
8f2a734f | 2343 | if (!(virtual_depth || TREE_STATIC (level))) |
03fd3f84 | 2344 | /* Neither is morally virtual, so cannot hide each other. */ |
8f2a734f | 2345 | continue; |
c8094d83 | 2346 | |
8f2a734f NS |
2347 | if (!TREE_VALUE (level)) |
2348 | /* They evaporated away already. */ | |
2349 | continue; | |
2350 | ||
2351 | they_hide_us = (virtual_depth | |
2352 | && original_binfo (binfo, TREE_PURPOSE (level))); | |
2353 | we_hide_them = (!they_hide_us && TREE_STATIC (level) | |
2354 | && original_binfo (TREE_PURPOSE (level), binfo)); | |
2355 | ||
2356 | if (!(we_hide_them || they_hide_us)) | |
2357 | /* Neither is within the other, so no hiding can occur. */ | |
2358 | continue; | |
c8094d83 | 2359 | |
8f2a734f NS |
2360 | for (prev = &TREE_VALUE (level), other = *prev; other;) |
2361 | { | |
2362 | if (same_type_p (to_type, TREE_TYPE (other))) | |
2363 | { | |
2364 | if (they_hide_us) | |
03fd3f84 | 2365 | /* We are hidden. */ |
8f2a734f NS |
2366 | return 0; |
2367 | ||
2368 | if (we_hide_them) | |
2369 | { | |
2370 | /* We hide the other one. */ | |
2371 | other = TREE_CHAIN (other); | |
2372 | *prev = other; | |
2373 | continue; | |
2374 | } | |
2375 | } | |
2376 | prev = &TREE_CHAIN (other); | |
2377 | other = *prev; | |
2378 | } | |
2379 | } | |
2380 | } | |
2381 | return 1; | |
2382 | } | |
2383 | ||
2384 | /* Helper for lookup_conversions_r. PARENT_CONVS is a list of lists | |
2385 | of conversion functions, the first slot will be for the current | |
2386 | binfo, if MY_CONVS is non-NULL. CHILD_CONVS is the list of lists | |
77880ae4 KH |
2387 | of conversion functions from children of the current binfo, |
2388 | concatenated with conversions from elsewhere in the hierarchy -- | |
8f2a734f NS |
2389 | that list begins with OTHER_CONVS. Return a single list of lists |
2390 | containing only conversions from the current binfo and its | |
2391 | children. */ | |
2392 | ||
72c4a2a6 | 2393 | static tree |
8f2a734f NS |
2394 | split_conversions (tree my_convs, tree parent_convs, |
2395 | tree child_convs, tree other_convs) | |
e1cd6e56 | 2396 | { |
8f2a734f NS |
2397 | tree t; |
2398 | tree prev; | |
c8094d83 | 2399 | |
8f2a734f NS |
2400 | /* Remove the original other_convs portion from child_convs. */ |
2401 | for (prev = NULL, t = child_convs; | |
2402 | t != other_convs; prev = t, t = TREE_CHAIN (t)) | |
2403 | continue; | |
c8094d83 | 2404 | |
8f2a734f NS |
2405 | if (prev) |
2406 | TREE_CHAIN (prev) = NULL_TREE; | |
2407 | else | |
2408 | child_convs = NULL_TREE; | |
72b7eeff | 2409 | |
8f2a734f NS |
2410 | /* Attach the child convs to any we had at this level. */ |
2411 | if (my_convs) | |
2412 | { | |
2413 | my_convs = parent_convs; | |
2414 | TREE_CHAIN (my_convs) = child_convs; | |
2415 | } | |
2416 | else | |
2417 | my_convs = child_convs; | |
c8094d83 | 2418 | |
8f2a734f NS |
2419 | return my_convs; |
2420 | } | |
2421 | ||
2422 | /* Worker for lookup_conversions. Lookup conversion functions in | |
2e12a855 NS |
2423 | BINFO and its children. VIRTUAL_DEPTH is nonzero, if BINFO is in a |
2424 | morally virtual base, and VIRTUALNESS is nonzero, if we've | |
2425 | encountered virtual bases already in the tree walk. PARENT_CONVS | |
2426 | is a list of conversions within parent binfos. OTHER_CONVS are | |
2427 | conversions found elsewhere in the tree. Return the conversions | |
2428 | found within this portion of the graph in CONVS. Return nonzero if | |
2429 | we encountered virtualness. We keep template and non-template | |
8f2a734f NS |
2430 | conversions separate, to avoid unnecessary type comparisons. |
2431 | ||
2432 | The located conversion functions are held in lists of lists. The | |
2433 | TREE_VALUE of the outer list is the list of conversion functions | |
2434 | found in a particular binfo. The TREE_PURPOSE of both the outer | |
2435 | and inner lists is the binfo at which those conversions were | |
2436 | found. TREE_STATIC is set for those lists within of morally | |
2437 | virtual binfos. The TREE_VALUE of the inner list is the conversion | |
2438 | function or overload itself. The TREE_TYPE of each inner list node | |
2439 | is the converted-to type. */ | |
2440 | ||
2441 | static int | |
2e12a855 NS |
2442 | lookup_conversions_r (tree binfo, int virtual_depth, int virtualness, |
2443 | tree parent_convs, tree other_convs, tree *convs) | |
8f2a734f NS |
2444 | { |
2445 | int my_virtualness = 0; | |
2446 | tree my_convs = NULL_TREE; | |
8f2a734f | 2447 | tree child_convs = NULL_TREE; |
a7a64a77 | 2448 | |
8f2a734f NS |
2449 | /* If we have no conversion operators, then don't look. */ |
2450 | if (!TYPE_HAS_CONVERSION (BINFO_TYPE (binfo))) | |
2451 | { | |
2e12a855 | 2452 | *convs = NULL_TREE; |
c8094d83 | 2453 | |
8f2a734f NS |
2454 | return 0; |
2455 | } | |
c8094d83 | 2456 | |
8f2a734f NS |
2457 | if (BINFO_VIRTUAL_P (binfo)) |
2458 | virtual_depth++; | |
c8094d83 | 2459 | |
8f2a734f | 2460 | /* First, locate the unhidden ones at this level. */ |
527b7b19 | 2461 | if (tree conv = get_class_binding (BINFO_TYPE (binfo), conv_op_identifier)) |
2e12a855 NS |
2462 | for (ovl_iterator iter (conv); iter; ++iter) |
2463 | { | |
2464 | tree fn = *iter; | |
2465 | tree type = DECL_CONV_FN_TYPE (fn); | |
72c4a2a6 | 2466 | |
2e12a855 | 2467 | if (TREE_CODE (fn) != TEMPLATE_DECL && type_uses_auto (type)) |
8f2a734f | 2468 | { |
2e12a855 NS |
2469 | mark_used (fn); |
2470 | type = DECL_CONV_FN_TYPE (fn); | |
2471 | } | |
8f2a734f | 2472 | |
2e12a855 NS |
2473 | if (check_hidden_convs (binfo, virtual_depth, virtualness, |
2474 | type, parent_convs, other_convs)) | |
2475 | { | |
2476 | my_convs = tree_cons (binfo, fn, my_convs); | |
2477 | TREE_TYPE (my_convs) = type; | |
2478 | if (virtual_depth) | |
20d65560 | 2479 | { |
2e12a855 NS |
2480 | TREE_STATIC (my_convs) = 1; |
2481 | my_virtualness = 1; | |
20d65560 | 2482 | } |
72c4a2a6 | 2483 | } |
72b7eeff | 2484 | } |
8f2a734f NS |
2485 | |
2486 | if (my_convs) | |
2487 | { | |
2488 | parent_convs = tree_cons (binfo, my_convs, parent_convs); | |
2489 | if (virtual_depth) | |
2490 | TREE_STATIC (parent_convs) = 1; | |
2491 | } | |
c8094d83 | 2492 | |
8f2a734f | 2493 | child_convs = other_convs; |
c8094d83 | 2494 | |
8f2a734f | 2495 | /* Now iterate over each base, looking for more conversions. */ |
2e12a855 NS |
2496 | unsigned i; |
2497 | tree base_binfo; | |
8f2a734f NS |
2498 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
2499 | { | |
2e12a855 | 2500 | tree base_convs; |
8f2a734f NS |
2501 | unsigned base_virtualness; |
2502 | ||
2503 | base_virtualness = lookup_conversions_r (base_binfo, | |
2504 | virtual_depth, virtualness, | |
2e12a855 NS |
2505 | parent_convs, child_convs, |
2506 | &base_convs); | |
8f2a734f NS |
2507 | if (base_virtualness) |
2508 | my_virtualness = virtualness = 1; | |
2509 | child_convs = chainon (base_convs, child_convs); | |
8f2a734f NS |
2510 | } |
2511 | ||
8f2a734f NS |
2512 | *convs = split_conversions (my_convs, parent_convs, |
2513 | child_convs, other_convs); | |
c8094d83 | 2514 | |
8f2a734f | 2515 | return my_virtualness; |
e1cd6e56 MS |
2516 | } |
2517 | ||
27b8d0cd MM |
2518 | /* Return a TREE_LIST containing all the non-hidden user-defined |
2519 | conversion functions for TYPE (and its base-classes). The | |
8f2a734f NS |
2520 | TREE_VALUE of each node is the FUNCTION_DECL of the conversion |
2521 | function. The TREE_PURPOSE is the BINFO from which the conversion | |
2522 | functions in this node were selected. This function is effectively | |
2523 | performing a set of member lookups as lookup_fnfield does, but | |
2524 | using the type being converted to as the unique key, rather than the | |
9c7d5cae | 2525 | field name. */ |
27b8d0cd | 2526 | |
e1cd6e56 | 2527 | tree |
9c7d5cae | 2528 | lookup_conversions (tree type) |
e1cd6e56 | 2529 | { |
2e12a855 | 2530 | tree convs; |
c8094d83 | 2531 | |
0171b21c | 2532 | complete_type (type); |
ae8310ec | 2533 | if (!CLASS_TYPE_P (type) || !TYPE_BINFO (type)) |
8f2a734f | 2534 | return NULL_TREE; |
c8094d83 | 2535 | |
2e12a855 | 2536 | lookup_conversions_r (TYPE_BINFO (type), 0, 0, NULL_TREE, NULL_TREE, &convs); |
c8094d83 | 2537 | |
2e12a855 NS |
2538 | tree list = NULL_TREE; |
2539 | ||
8f2a734f NS |
2540 | /* Flatten the list-of-lists */ |
2541 | for (; convs; convs = TREE_CHAIN (convs)) | |
2542 | { | |
2543 | tree probe, next; | |
2544 | ||
2545 | for (probe = TREE_VALUE (convs); probe; probe = next) | |
2546 | { | |
2547 | next = TREE_CHAIN (probe); | |
2548 | ||
2549 | TREE_CHAIN (probe) = list; | |
2550 | list = probe; | |
2551 | } | |
2552 | } | |
c8094d83 | 2553 | |
8f2a734f | 2554 | return list; |
e1cd6e56 | 2555 | } |
6467930b | 2556 | |
9965d119 NS |
2557 | /* Returns the binfo of the first direct or indirect virtual base derived |
2558 | from BINFO, or NULL if binfo is not via virtual. */ | |
6ad07332 | 2559 | |
f9825168 | 2560 | tree |
86ac0575 | 2561 | binfo_from_vbase (tree binfo) |
6ad07332 JM |
2562 | { |
2563 | for (; binfo; binfo = BINFO_INHERITANCE_CHAIN (binfo)) | |
2564 | { | |
809e3e7f | 2565 | if (BINFO_VIRTUAL_P (binfo)) |
f9825168 | 2566 | return binfo; |
6ad07332 | 2567 | } |
f9825168 | 2568 | return NULL_TREE; |
6ad07332 | 2569 | } |
a55583e9 | 2570 | |
9965d119 NS |
2571 | /* Returns the binfo of the first direct or indirect virtual base derived |
2572 | from BINFO up to the TREE_TYPE, LIMIT, or NULL if binfo is not | |
2573 | via virtual. */ | |
2574 | ||
2575 | tree | |
86ac0575 | 2576 | binfo_via_virtual (tree binfo, tree limit) |
9965d119 | 2577 | { |
2c2e8978 NS |
2578 | if (limit && !CLASSTYPE_VBASECLASSES (limit)) |
2579 | /* LIMIT has no virtual bases, so BINFO cannot be via one. */ | |
2580 | return NULL_TREE; | |
c8094d83 | 2581 | |
539ed333 | 2582 | for (; binfo && !SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), limit); |
9965d119 NS |
2583 | binfo = BINFO_INHERITANCE_CHAIN (binfo)) |
2584 | { | |
809e3e7f | 2585 | if (BINFO_VIRTUAL_P (binfo)) |
9965d119 NS |
2586 | return binfo; |
2587 | } | |
2588 | return NULL_TREE; | |
2589 | } | |
2590 | ||
84eb0f1a JM |
2591 | /* BINFO is for a base class in some hierarchy. Return true iff it is a |
2592 | direct base. */ | |
2593 | ||
2594 | bool | |
2595 | binfo_direct_p (tree binfo) | |
2596 | { | |
2597 | tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo); | |
2598 | if (BINFO_INHERITANCE_CHAIN (d_binfo)) | |
2599 | /* A second inheritance chain means indirect. */ | |
2600 | return false; | |
2601 | if (!BINFO_VIRTUAL_P (binfo)) | |
2602 | /* Non-virtual, so only one inheritance chain means direct. */ | |
2603 | return true; | |
2604 | /* A virtual base looks like a direct base, so we need to look through the | |
2605 | direct bases to see if it's there. */ | |
2606 | tree b_binfo; | |
2607 | for (int i = 0; BINFO_BASE_ITERATE (d_binfo, i, b_binfo); ++i) | |
2608 | if (b_binfo == binfo) | |
2609 | return true; | |
2610 | return false; | |
2611 | } | |
2612 | ||
dbbf88d1 NS |
2613 | /* BINFO is a base binfo in the complete type BINFO_TYPE (HERE). |
2614 | Find the equivalent binfo within whatever graph HERE is located. | |
9bcb9aae | 2615 | This is the inverse of original_binfo. */ |
a55583e9 MM |
2616 | |
2617 | tree | |
dbbf88d1 | 2618 | copied_binfo (tree binfo, tree here) |
a55583e9 | 2619 | { |
dbbf88d1 | 2620 | tree result = NULL_TREE; |
c8094d83 | 2621 | |
809e3e7f | 2622 | if (BINFO_VIRTUAL_P (binfo)) |
dbbf88d1 NS |
2623 | { |
2624 | tree t; | |
a55583e9 | 2625 | |
dbbf88d1 NS |
2626 | for (t = here; BINFO_INHERITANCE_CHAIN (t); |
2627 | t = BINFO_INHERITANCE_CHAIN (t)) | |
2628 | continue; | |
58c42dc2 NS |
2629 | |
2630 | result = binfo_for_vbase (BINFO_TYPE (binfo), BINFO_TYPE (t)); | |
dbbf88d1 NS |
2631 | } |
2632 | else if (BINFO_INHERITANCE_CHAIN (binfo)) | |
2633 | { | |
fa743e8c NS |
2634 | tree cbinfo; |
2635 | tree base_binfo; | |
2636 | int ix; | |
c8094d83 | 2637 | |
fa743e8c NS |
2638 | cbinfo = copied_binfo (BINFO_INHERITANCE_CHAIN (binfo), here); |
2639 | for (ix = 0; BINFO_BASE_ITERATE (cbinfo, ix, base_binfo); ix++) | |
539ed333 | 2640 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo), BINFO_TYPE (binfo))) |
fa743e8c NS |
2641 | { |
2642 | result = base_binfo; | |
2643 | break; | |
2644 | } | |
dbbf88d1 NS |
2645 | } |
2646 | else | |
2647 | { | |
539ed333 | 2648 | gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (here), BINFO_TYPE (binfo))); |
dbbf88d1 NS |
2649 | result = here; |
2650 | } | |
2651 | ||
50bc768d | 2652 | gcc_assert (result); |
dbbf88d1 | 2653 | return result; |
a55583e9 | 2654 | } |
dbbf88d1 | 2655 | |
58c42dc2 NS |
2656 | tree |
2657 | binfo_for_vbase (tree base, tree t) | |
2658 | { | |
2659 | unsigned ix; | |
2660 | tree binfo; | |
9771b263 | 2661 | vec<tree, va_gc> *vbases; |
c8094d83 | 2662 | |
9ba5ff0f | 2663 | for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0; |
9771b263 | 2664 | vec_safe_iterate (vbases, ix, &binfo); ix++) |
539ed333 | 2665 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), base)) |
58c42dc2 NS |
2666 | return binfo; |
2667 | return NULL; | |
2668 | } | |
2669 | ||
dbbf88d1 | 2670 | /* BINFO is some base binfo of HERE, within some other |
34cd5ae7 | 2671 | hierarchy. Return the equivalent binfo, but in the hierarchy |
dbbf88d1 | 2672 | dominated by HERE. This is the inverse of copied_binfo. If BINFO |
9bcb9aae | 2673 | is not a base binfo of HERE, returns NULL_TREE. */ |
dbbf88d1 NS |
2674 | |
2675 | tree | |
2676 | original_binfo (tree binfo, tree here) | |
2677 | { | |
2678 | tree result = NULL; | |
c8094d83 | 2679 | |
539ed333 | 2680 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (here))) |
dbbf88d1 | 2681 | result = here; |
809e3e7f | 2682 | else if (BINFO_VIRTUAL_P (binfo)) |
58c42dc2 NS |
2683 | result = (CLASSTYPE_VBASECLASSES (BINFO_TYPE (here)) |
2684 | ? binfo_for_vbase (BINFO_TYPE (binfo), BINFO_TYPE (here)) | |
2685 | : NULL_TREE); | |
dbbf88d1 NS |
2686 | else if (BINFO_INHERITANCE_CHAIN (binfo)) |
2687 | { | |
2688 | tree base_binfos; | |
c8094d83 | 2689 | |
dbbf88d1 NS |
2690 | base_binfos = original_binfo (BINFO_INHERITANCE_CHAIN (binfo), here); |
2691 | if (base_binfos) | |
2692 | { | |
fa743e8c NS |
2693 | int ix; |
2694 | tree base_binfo; | |
c8094d83 | 2695 | |
fa743e8c | 2696 | for (ix = 0; (base_binfo = BINFO_BASE_BINFO (base_binfos, ix)); ix++) |
539ed333 NS |
2697 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo), |
2698 | BINFO_TYPE (binfo))) | |
fa743e8c NS |
2699 | { |
2700 | result = base_binfo; | |
2701 | break; | |
2702 | } | |
dbbf88d1 NS |
2703 | } |
2704 | } | |
c8094d83 | 2705 | |
dbbf88d1 NS |
2706 | return result; |
2707 | } | |
2708 | ||
23cb7266 JM |
2709 | /* True iff TYPE has any dependent bases (and therefore we can't say |
2710 | definitively that another class is not a base of an instantiation of | |
2711 | TYPE). */ | |
2712 | ||
2713 | bool | |
2714 | any_dependent_bases_p (tree type) | |
2715 | { | |
e597f682 | 2716 | if (!type || !CLASS_TYPE_P (type) || !uses_template_parms (type)) |
23cb7266 JM |
2717 | return false; |
2718 | ||
b4cda6a6 JM |
2719 | /* If we haven't set TYPE_BINFO yet, we don't know anything about the bases. |
2720 | Return false because in this situation we aren't actually looking up names | |
2721 | in the scope of the class, so it doesn't matter whether it has dependent | |
2722 | bases. */ | |
2723 | if (!TYPE_BINFO (type)) | |
2724 | return false; | |
2725 | ||
23cb7266 JM |
2726 | unsigned i; |
2727 | tree base_binfo; | |
2728 | FOR_EACH_VEC_SAFE_ELT (BINFO_BASE_BINFOS (TYPE_BINFO (type)), i, base_binfo) | |
2729 | if (BINFO_DEPENDENT_BASE_P (base_binfo)) | |
2730 | return true; | |
2731 | ||
2732 | return false; | |
2733 | } |