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aed81407 | 1 | /* Definitions for C++ name lookup routines. |
2e034e32 | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
e77f031d | 3 | Free Software Foundation, Inc. |
aed81407 GDR |
4 | Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net> |
5 | ||
ed3cf953 | 6 | This file is part of GCC. |
aed81407 | 7 | |
ed3cf953 | 8 | GCC is free software; you can redistribute it and/or modify |
aed81407 | 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) |
aed81407 GDR |
11 | any later version. |
12 | ||
ed3cf953 | 13 | GCC is distributed in the hope that it will be useful, |
aed81407 GDR |
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/>. */ | |
aed81407 GDR |
21 | |
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
25 | #include "tm.h" | |
a5e6b29b | 26 | #include "flags.h" |
aed81407 GDR |
27 | #include "tree.h" |
28 | #include "cp-tree.h" | |
29 | #include "name-lookup.h" | |
ed3cf953 | 30 | #include "timevar.h" |
1da2ed5f | 31 | #include "diagnostic-core.h" |
501c95ff | 32 | #include "intl.h" |
6097b0c3 | 33 | #include "debug.h" |
39dabefd | 34 | #include "c-family/c-pragma.h" |
501c95ff | 35 | #include "params.h" |
00e8de68 | 36 | |
15f8ac7f GK |
37 | /* The bindings for a particular name in a particular scope. */ |
38 | ||
39 | struct scope_binding { | |
40 | tree value; | |
41 | tree type; | |
42 | }; | |
43 | #define EMPTY_SCOPE_BINDING { NULL_TREE, NULL_TREE } | |
44 | ||
00e8de68 | 45 | static cxx_scope *innermost_nonclass_level (void); |
5a167978 | 46 | static cxx_binding *binding_for_name (cxx_scope *, tree); |
d63d5d0c | 47 | static tree push_overloaded_decl (tree, int, bool); |
15f8ac7f | 48 | static bool lookup_using_namespace (tree, struct scope_binding *, tree, |
0cbd7506 | 49 | tree, int); |
15f8ac7f GK |
50 | static bool qualified_lookup_using_namespace (tree, tree, |
51 | struct scope_binding *, int); | |
a5e6b29b GDR |
52 | static tree lookup_type_current_level (tree); |
53 | static tree push_using_directive (tree); | |
ecba6c56 | 54 | static cxx_binding* lookup_extern_c_fun_binding_in_all_ns (tree); |
5a167978 GDR |
55 | |
56 | /* The :: namespace. */ | |
57 | ||
58 | tree global_namespace; | |
00e8de68 | 59 | |
ed36980c JM |
60 | /* The name of the anonymous namespace, throughout this translation |
61 | unit. */ | |
aa26a3f6 | 62 | static GTY(()) tree anonymous_namespace_name; |
ed36980c | 63 | |
811895d5 | 64 | /* Initialize anonymous_namespace_name if necessary, and return it. */ |
5880f14f | 65 | |
52669d59 | 66 | static tree |
61e6d522 | 67 | get_anonymous_namespace_name (void) |
5880f14f GK |
68 | { |
69 | if (!anonymous_namespace_name) | |
70 | { | |
71 | /* The anonymous namespace has to have a unique name | |
72 | if typeinfo objects are being compared by name. */ | |
52669d59 JQ |
73 | if (! flag_weak || ! SUPPORTS_ONE_ONLY) |
74 | anonymous_namespace_name = get_file_function_name ("N"); | |
75 | else | |
76 | /* The demangler expects anonymous namespaces to be called | |
77 | something starting with '_GLOBAL__N_'. */ | |
78 | anonymous_namespace_name = get_identifier ("_GLOBAL__N_1"); | |
5880f14f GK |
79 | } |
80 | return anonymous_namespace_name; | |
81 | } | |
aed81407 | 82 | |
5e0c54e5 GDR |
83 | /* Compute the chain index of a binding_entry given the HASH value of its |
84 | name and the total COUNT of chains. COUNT is assumed to be a power | |
85 | of 2. */ | |
daafa301 | 86 | |
5e0c54e5 GDR |
87 | #define ENTRY_INDEX(HASH, COUNT) (((HASH) >> 3) & ((COUNT) - 1)) |
88 | ||
89 | /* A free list of "binding_entry"s awaiting for re-use. */ | |
daafa301 | 90 | |
1431042e | 91 | static GTY((deletable)) binding_entry free_binding_entry = NULL; |
5e0c54e5 GDR |
92 | |
93 | /* Create a binding_entry object for (NAME, TYPE). */ | |
daafa301 | 94 | |
5e0c54e5 GDR |
95 | static inline binding_entry |
96 | binding_entry_make (tree name, tree type) | |
97 | { | |
98 | binding_entry entry; | |
99 | ||
100 | if (free_binding_entry) | |
101 | { | |
102 | entry = free_binding_entry; | |
103 | free_binding_entry = entry->chain; | |
104 | } | |
105 | else | |
a9429e29 | 106 | entry = ggc_alloc_binding_entry_s (); |
5e0c54e5 GDR |
107 | |
108 | entry->name = name; | |
109 | entry->type = type; | |
7e8f3096 | 110 | entry->chain = NULL; |
5e0c54e5 GDR |
111 | |
112 | return entry; | |
113 | } | |
114 | ||
115 | /* Put ENTRY back on the free list. */ | |
e57df6fe | 116 | #if 0 |
5e0c54e5 GDR |
117 | static inline void |
118 | binding_entry_free (binding_entry entry) | |
119 | { | |
04693f2f GDR |
120 | entry->name = NULL; |
121 | entry->type = NULL; | |
5e0c54e5 GDR |
122 | entry->chain = free_binding_entry; |
123 | free_binding_entry = entry; | |
124 | } | |
e57df6fe | 125 | #endif |
5e0c54e5 GDR |
126 | |
127 | /* The datatype used to implement the mapping from names to types at | |
128 | a given scope. */ | |
d1b38208 | 129 | struct GTY(()) binding_table_s { |
5e0c54e5 GDR |
130 | /* Array of chains of "binding_entry"s */ |
131 | binding_entry * GTY((length ("%h.chain_count"))) chain; | |
132 | ||
133 | /* The number of chains in this table. This is the length of the | |
39a13be5 | 134 | member "chain" considered as an array. */ |
5e0c54e5 GDR |
135 | size_t chain_count; |
136 | ||
137 | /* Number of "binding_entry"s in this table. */ | |
138 | size_t entry_count; | |
139 | }; | |
140 | ||
141 | /* Construct TABLE with an initial CHAIN_COUNT. */ | |
daafa301 | 142 | |
5e0c54e5 GDR |
143 | static inline void |
144 | binding_table_construct (binding_table table, size_t chain_count) | |
145 | { | |
146 | table->chain_count = chain_count; | |
147 | table->entry_count = 0; | |
a9429e29 | 148 | table->chain = ggc_alloc_cleared_vec_binding_entry (table->chain_count); |
5e0c54e5 GDR |
149 | } |
150 | ||
daafa301 | 151 | /* Make TABLE's entries ready for reuse. */ |
e57df6fe | 152 | #if 0 |
00e8de68 | 153 | static void |
5e0c54e5 GDR |
154 | binding_table_free (binding_table table) |
155 | { | |
156 | size_t i; | |
daafa301 GDR |
157 | size_t count; |
158 | ||
5e0c54e5 GDR |
159 | if (table == NULL) |
160 | return; | |
161 | ||
daafa301 | 162 | for (i = 0, count = table->chain_count; i < count; ++i) |
5e0c54e5 | 163 | { |
7e8f3096 AP |
164 | binding_entry temp = table->chain[i]; |
165 | while (temp != NULL) | |
0cbd7506 MS |
166 | { |
167 | binding_entry entry = temp; | |
168 | temp = entry->chain; | |
169 | binding_entry_free (entry); | |
170 | } | |
daafa301 | 171 | table->chain[i] = NULL; |
5e0c54e5 GDR |
172 | } |
173 | table->entry_count = 0; | |
174 | } | |
e57df6fe | 175 | #endif |
5e0c54e5 GDR |
176 | |
177 | /* Allocate a table with CHAIN_COUNT, assumed to be a power of two. */ | |
daafa301 | 178 | |
00e8de68 | 179 | static inline binding_table |
5e0c54e5 GDR |
180 | binding_table_new (size_t chain_count) |
181 | { | |
a9429e29 | 182 | binding_table table = ggc_alloc_binding_table_s (); |
7e8f3096 | 183 | table->chain = NULL; |
5e0c54e5 GDR |
184 | binding_table_construct (table, chain_count); |
185 | return table; | |
186 | } | |
187 | ||
188 | /* Expand TABLE to twice its current chain_count. */ | |
daafa301 | 189 | |
5e0c54e5 GDR |
190 | static void |
191 | binding_table_expand (binding_table table) | |
192 | { | |
193 | const size_t old_chain_count = table->chain_count; | |
194 | const size_t old_entry_count = table->entry_count; | |
195 | const size_t new_chain_count = 2 * old_chain_count; | |
196 | binding_entry *old_chains = table->chain; | |
197 | size_t i; | |
198 | ||
199 | binding_table_construct (table, new_chain_count); | |
200 | for (i = 0; i < old_chain_count; ++i) | |
201 | { | |
202 | binding_entry entry = old_chains[i]; | |
203 | for (; entry != NULL; entry = old_chains[i]) | |
0cbd7506 MS |
204 | { |
205 | const unsigned int hash = IDENTIFIER_HASH_VALUE (entry->name); | |
206 | const size_t j = ENTRY_INDEX (hash, new_chain_count); | |
207 | ||
208 | old_chains[i] = entry->chain; | |
209 | entry->chain = table->chain[j]; | |
210 | table->chain[j] = entry; | |
211 | } | |
5e0c54e5 GDR |
212 | } |
213 | table->entry_count = old_entry_count; | |
214 | } | |
215 | ||
daafa301 GDR |
216 | /* Insert a binding for NAME to TYPE into TABLE. */ |
217 | ||
00e8de68 | 218 | static void |
5e0c54e5 GDR |
219 | binding_table_insert (binding_table table, tree name, tree type) |
220 | { | |
221 | const unsigned int hash = IDENTIFIER_HASH_VALUE (name); | |
222 | const size_t i = ENTRY_INDEX (hash, table->chain_count); | |
223 | binding_entry entry = binding_entry_make (name, type); | |
224 | ||
225 | entry->chain = table->chain[i]; | |
226 | table->chain[i] = entry; | |
227 | ++table->entry_count; | |
228 | ||
229 | if (3 * table->chain_count < 5 * table->entry_count) | |
230 | binding_table_expand (table); | |
231 | } | |
232 | ||
233 | /* Return the binding_entry, if any, that maps NAME. */ | |
daafa301 | 234 | |
5e0c54e5 GDR |
235 | binding_entry |
236 | binding_table_find (binding_table table, tree name) | |
237 | { | |
238 | const unsigned int hash = IDENTIFIER_HASH_VALUE (name); | |
239 | binding_entry entry = table->chain[ENTRY_INDEX (hash, table->chain_count)]; | |
240 | ||
241 | while (entry != NULL && entry->name != name) | |
242 | entry = entry->chain; | |
243 | ||
244 | return entry; | |
245 | } | |
246 | ||
5e0c54e5 | 247 | /* Apply PROC -- with DATA -- to all entries in TABLE. */ |
daafa301 | 248 | |
5e0c54e5 GDR |
249 | void |
250 | binding_table_foreach (binding_table table, bt_foreach_proc proc, void *data) | |
251 | { | |
252 | const size_t chain_count = table->chain_count; | |
253 | size_t i; | |
254 | ||
255 | for (i = 0; i < chain_count; ++i) | |
256 | { | |
257 | binding_entry entry = table->chain[i]; | |
258 | for (; entry != NULL; entry = entry->chain) | |
0cbd7506 | 259 | proc (entry, data); |
5e0c54e5 GDR |
260 | } |
261 | } | |
262 | \f | |
00e8de68 GDR |
263 | #ifndef ENABLE_SCOPE_CHECKING |
264 | # define ENABLE_SCOPE_CHECKING 0 | |
265 | #else | |
266 | # define ENABLE_SCOPE_CHECKING 1 | |
267 | #endif | |
5e0c54e5 | 268 | |
aed81407 | 269 | /* A free list of "cxx_binding"s, connected by their PREVIOUS. */ |
daafa301 | 270 | |
1431042e | 271 | static GTY((deletable)) cxx_binding *free_bindings; |
aed81407 | 272 | |
89b578be MM |
273 | /* Initialize VALUE and TYPE field for BINDING, and set the PREVIOUS |
274 | field to NULL. */ | |
275 | ||
276 | static inline void | |
277 | cxx_binding_init (cxx_binding *binding, tree value, tree type) | |
278 | { | |
279 | binding->value = value; | |
280 | binding->type = type; | |
281 | binding->previous = NULL; | |
282 | } | |
283 | ||
aed81407 | 284 | /* (GC)-allocate a binding object with VALUE and TYPE member initialized. */ |
daafa301 | 285 | |
00e8de68 | 286 | static cxx_binding * |
aed81407 GDR |
287 | cxx_binding_make (tree value, tree type) |
288 | { | |
289 | cxx_binding *binding; | |
290 | if (free_bindings) | |
291 | { | |
292 | binding = free_bindings; | |
293 | free_bindings = binding->previous; | |
294 | } | |
295 | else | |
a9429e29 | 296 | binding = ggc_alloc_cxx_binding (); |
aed81407 | 297 | |
89b578be | 298 | cxx_binding_init (binding, value, type); |
aed81407 GDR |
299 | |
300 | return binding; | |
301 | } | |
302 | ||
303 | /* Put BINDING back on the free list. */ | |
daafa301 | 304 | |
00e8de68 | 305 | static inline void |
aed81407 GDR |
306 | cxx_binding_free (cxx_binding *binding) |
307 | { | |
daafa301 | 308 | binding->scope = NULL; |
aed81407 GDR |
309 | binding->previous = free_bindings; |
310 | free_bindings = binding; | |
311 | } | |
c87ceb13 | 312 | |
90ea9897 MM |
313 | /* Create a new binding for NAME (with the indicated VALUE and TYPE |
314 | bindings) in the class scope indicated by SCOPE. */ | |
00e8de68 | 315 | |
90ea9897 MM |
316 | static cxx_binding * |
317 | new_class_binding (tree name, tree value, tree type, cxx_scope *scope) | |
00e8de68 | 318 | { |
90ea9897 | 319 | cp_class_binding *cb; |
89b578be | 320 | cxx_binding *binding; |
c8094d83 | 321 | |
90ea9897 | 322 | if (VEC_length (cp_class_binding, scope->class_shadowed)) |
89b578be | 323 | { |
90ea9897 MM |
324 | cp_class_binding *old_base; |
325 | old_base = VEC_index (cp_class_binding, scope->class_shadowed, 0); | |
d4e6fecb | 326 | if (VEC_reserve (cp_class_binding, gc, scope->class_shadowed, 1)) |
7de5bccc NS |
327 | { |
328 | /* Fixup the current bindings, as they might have moved. */ | |
329 | size_t i; | |
c8094d83 | 330 | |
ac47786e | 331 | FOR_EACH_VEC_ELT (cp_class_binding, scope->class_shadowed, i, cb) |
90ea9897 MM |
332 | { |
333 | cxx_binding **b; | |
334 | b = &IDENTIFIER_BINDING (cb->identifier); | |
335 | while (*b != &old_base[i].base) | |
336 | b = &((*b)->previous); | |
337 | *b = &cb->base; | |
338 | } | |
7de5bccc | 339 | } |
90ea9897 MM |
340 | cb = VEC_quick_push (cp_class_binding, scope->class_shadowed, NULL); |
341 | } | |
342 | else | |
d4e6fecb | 343 | cb = VEC_safe_push (cp_class_binding, gc, scope->class_shadowed, NULL); |
c8094d83 | 344 | |
90ea9897 MM |
345 | cb->identifier = name; |
346 | binding = &cb->base; | |
347 | binding->scope = scope; | |
348 | cxx_binding_init (binding, value, type); | |
349 | return binding; | |
350 | } | |
351 | ||
352 | /* Make DECL the innermost binding for ID. The LEVEL is the binding | |
353 | level at which this declaration is being bound. */ | |
354 | ||
355 | static void | |
356 | push_binding (tree id, tree decl, cxx_scope* level) | |
357 | { | |
358 | cxx_binding *binding; | |
7de5bccc | 359 | |
90ea9897 MM |
360 | if (level != class_binding_level) |
361 | { | |
362 | binding = cxx_binding_make (decl, NULL_TREE); | |
363 | binding->scope = level; | |
89b578be | 364 | } |
90ea9897 MM |
365 | else |
366 | binding = new_class_binding (id, decl, /*type=*/NULL_TREE, level); | |
c8094d83 | 367 | |
00e8de68 GDR |
368 | /* Now, fill in the binding information. */ |
369 | binding->previous = IDENTIFIER_BINDING (id); | |
00e8de68 GDR |
370 | INHERITED_VALUE_BINDING_P (binding) = 0; |
371 | LOCAL_BINDING_P (binding) = (level != class_binding_level); | |
372 | ||
373 | /* And put it on the front of the list of bindings for ID. */ | |
374 | IDENTIFIER_BINDING (id) = binding; | |
375 | } | |
376 | ||
377 | /* Remove the binding for DECL which should be the innermost binding | |
378 | for ID. */ | |
379 | ||
380 | void | |
381 | pop_binding (tree id, tree decl) | |
382 | { | |
383 | cxx_binding *binding; | |
384 | ||
385 | if (id == NULL_TREE) | |
386 | /* It's easiest to write the loops that call this function without | |
387 | checking whether or not the entities involved have names. We | |
388 | get here for such an entity. */ | |
389 | return; | |
390 | ||
391 | /* Get the innermost binding for ID. */ | |
392 | binding = IDENTIFIER_BINDING (id); | |
393 | ||
394 | /* The name should be bound. */ | |
50bc768d | 395 | gcc_assert (binding != NULL); |
00e8de68 GDR |
396 | |
397 | /* The DECL will be either the ordinary binding or the type | |
398 | binding for this identifier. Remove that binding. */ | |
399 | if (binding->value == decl) | |
400 | binding->value = NULL_TREE; | |
00e8de68 | 401 | else |
315fb5db NS |
402 | { |
403 | gcc_assert (binding->type == decl); | |
404 | binding->type = NULL_TREE; | |
405 | } | |
00e8de68 GDR |
406 | |
407 | if (!binding->value && !binding->type) | |
408 | { | |
409 | /* We're completely done with the innermost binding for this | |
410 | identifier. Unhook it from the list of bindings. */ | |
411 | IDENTIFIER_BINDING (id) = binding->previous; | |
412 | ||
413 | /* Add it to the free list. */ | |
414 | cxx_binding_free (binding); | |
415 | } | |
416 | } | |
417 | ||
c72a1a86 | 418 | /* BINDING records an existing declaration for a name in the current scope. |
c87ceb13 GDR |
419 | But, DECL is another declaration for that same identifier in the |
420 | same scope. This is the `struct stat' hack whereby a non-typedef | |
421 | class name or enum-name can be bound at the same level as some other | |
422 | kind of entity. | |
423 | 3.3.7/1 | |
424 | ||
425 | A class name (9.1) or enumeration name (7.2) can be hidden by the | |
426 | name of an object, function, or enumerator declared in the same scope. | |
427 | If a class or enumeration name and an object, function, or enumerator | |
428 | are declared in the same scope (in any order) with the same name, the | |
429 | class or enumeration name is hidden wherever the object, function, or | |
430 | enumerator name is visible. | |
431 | ||
432 | It's the responsibility of the caller to check that | |
433 | inserting this name is valid here. Returns nonzero if the new binding | |
434 | was successful. */ | |
435 | ||
00e8de68 | 436 | static bool |
c87ceb13 GDR |
437 | supplement_binding (cxx_binding *binding, tree decl) |
438 | { | |
439 | tree bval = binding->value; | |
440 | bool ok = true; | |
441 | ||
442 | timevar_push (TV_NAME_LOOKUP); | |
443 | if (TREE_CODE (decl) == TYPE_DECL && DECL_ARTIFICIAL (decl)) | |
444 | /* The new name is the type name. */ | |
445 | binding->type = decl; | |
62d99768 MM |
446 | else if (/* BVAL is null when push_class_level_binding moves an |
447 | inherited type-binding out of the way to make room for a | |
448 | new value binding. */ | |
c8094d83 | 449 | !bval |
62d99768 MM |
450 | /* BVAL is error_mark_node when DECL's name has been used |
451 | in a non-class scope prior declaration. In that case, | |
452 | we should have already issued a diagnostic; for graceful | |
453 | error recovery purpose, pretend this was the intended | |
454 | declaration for that name. */ | |
455 | || bval == error_mark_node | |
d63d5d0c | 456 | /* If BVAL is anticipated but has not yet been declared, |
62d99768 MM |
457 | pretend it is not there at all. */ |
458 | || (TREE_CODE (bval) == FUNCTION_DECL | |
d63d5d0c ILT |
459 | && DECL_ANTICIPATED (bval) |
460 | && !DECL_HIDDEN_FRIEND_P (bval))) | |
c87ceb13 GDR |
461 | binding->value = decl; |
462 | else if (TREE_CODE (bval) == TYPE_DECL && DECL_ARTIFICIAL (bval)) | |
463 | { | |
464 | /* The old binding was a type name. It was placed in | |
147135cc | 465 | VALUE field because it was thought, at the point it was |
c87ceb13 GDR |
466 | declared, to be the only entity with such a name. Move the |
467 | type name into the type slot; it is now hidden by the new | |
468 | binding. */ | |
469 | binding->type = bval; | |
470 | binding->value = decl; | |
471 | binding->value_is_inherited = false; | |
472 | } | |
473 | else if (TREE_CODE (bval) == TYPE_DECL | |
474 | && TREE_CODE (decl) == TYPE_DECL | |
475 | && DECL_NAME (decl) == DECL_NAME (bval) | |
9306cccb | 476 | && binding->scope->kind != sk_class |
c87ceb13 GDR |
477 | && (same_type_p (TREE_TYPE (decl), TREE_TYPE (bval)) |
478 | /* If either type involves template parameters, we must | |
479 | wait until instantiation. */ | |
480 | || uses_template_parms (TREE_TYPE (decl)) | |
481 | || uses_template_parms (TREE_TYPE (bval)))) | |
482 | /* We have two typedef-names, both naming the same type to have | |
9306cccb | 483 | the same name. In general, this is OK because of: |
c87ceb13 | 484 | |
0cbd7506 | 485 | [dcl.typedef] |
c87ceb13 GDR |
486 | |
487 | In a given scope, a typedef specifier can be used to redefine | |
488 | the name of any type declared in that scope to refer to the | |
c8094d83 | 489 | type to which it already refers. |
9306cccb MM |
490 | |
491 | However, in class scopes, this rule does not apply due to the | |
492 | stricter language in [class.mem] prohibiting redeclarations of | |
493 | members. */ | |
c87ceb13 GDR |
494 | ok = false; |
495 | /* There can be two block-scope declarations of the same variable, | |
496 | so long as they are `extern' declarations. However, there cannot | |
497 | be two declarations of the same static data member: | |
498 | ||
499 | [class.mem] | |
500 | ||
501 | A member shall not be declared twice in the | |
502 | member-specification. */ | |
503 | else if (TREE_CODE (decl) == VAR_DECL && TREE_CODE (bval) == VAR_DECL | |
504 | && DECL_EXTERNAL (decl) && DECL_EXTERNAL (bval) | |
505 | && !DECL_CLASS_SCOPE_P (decl)) | |
506 | { | |
d63d5d0c | 507 | duplicate_decls (decl, binding->value, /*newdecl_is_friend=*/false); |
c87ceb13 GDR |
508 | ok = false; |
509 | } | |
f746161e MM |
510 | else if (TREE_CODE (decl) == NAMESPACE_DECL |
511 | && TREE_CODE (bval) == NAMESPACE_DECL | |
512 | && DECL_NAMESPACE_ALIAS (decl) | |
513 | && DECL_NAMESPACE_ALIAS (bval) | |
514 | && ORIGINAL_NAMESPACE (bval) == ORIGINAL_NAMESPACE (decl)) | |
515 | /* [namespace.alias] | |
c8094d83 | 516 | |
f746161e MM |
517 | In a declarative region, a namespace-alias-definition can be |
518 | used to redefine a namespace-alias declared in that declarative | |
519 | region to refer only to the namespace to which it already | |
520 | refers. */ | |
521 | ok = false; | |
c87ceb13 GDR |
522 | else |
523 | { | |
2a13a625 | 524 | error ("declaration of %q#D", decl); |
dee15844 | 525 | error ("conflicts with previous declaration %q+#D", bval); |
c87ceb13 GDR |
526 | ok = false; |
527 | } | |
528 | ||
529 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ok); | |
530 | } | |
00e8de68 GDR |
531 | |
532 | /* Add DECL to the list of things declared in B. */ | |
533 | ||
a5e6b29b | 534 | static void |
00e8de68 GDR |
535 | add_decl_to_level (tree decl, cxx_scope *b) |
536 | { | |
89bd2c03 OW |
537 | /* We used to record virtual tables as if they were ordinary |
538 | variables, but no longer do so. */ | |
539 | gcc_assert (!(TREE_CODE (decl) == VAR_DECL && DECL_VIRTUAL_P (decl))); | |
540 | ||
c8094d83 | 541 | if (TREE_CODE (decl) == NAMESPACE_DECL |
00e8de68 GDR |
542 | && !DECL_NAMESPACE_ALIAS (decl)) |
543 | { | |
910ad8de | 544 | DECL_CHAIN (decl) = b->namespaces; |
00e8de68 GDR |
545 | b->namespaces = decl; |
546 | } | |
c8094d83 | 547 | else |
00e8de68 GDR |
548 | { |
549 | /* We build up the list in reverse order, and reverse it later if | |
0cbd7506 | 550 | necessary. */ |
00e8de68 GDR |
551 | TREE_CHAIN (decl) = b->names; |
552 | b->names = decl; | |
553 | b->names_size++; | |
554 | ||
97b6d55b | 555 | /* If appropriate, add decl to separate list of statics. We |
c8094d83 | 556 | include extern variables because they might turn out to be |
97b6d55b | 557 | static later. It's OK for this list to contain a few false |
324f9dfb | 558 | positives. */ |
00e8de68 | 559 | if (b->kind == sk_namespace) |
97b6d55b MA |
560 | if ((TREE_CODE (decl) == VAR_DECL |
561 | && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))) | |
00e8de68 GDR |
562 | || (TREE_CODE (decl) == FUNCTION_DECL |
563 | && (!TREE_PUBLIC (decl) || DECL_DECLARED_INLINE_P (decl)))) | |
9857866d | 564 | VEC_safe_push (tree, gc, b->static_decls, decl); |
00e8de68 GDR |
565 | } |
566 | } | |
567 | ||
a5e6b29b GDR |
568 | /* Record a decl-node X as belonging to the current lexical scope. |
569 | Check for errors (such as an incompatible declaration for the same | |
d63d5d0c ILT |
570 | name already seen in the same scope). IS_FRIEND is true if X is |
571 | declared as a friend. | |
a5e6b29b GDR |
572 | |
573 | Returns either X or an old decl for the same name. | |
574 | If an old decl is returned, it may have been smashed | |
575 | to agree with what X says. */ | |
576 | ||
577 | tree | |
d63d5d0c | 578 | pushdecl_maybe_friend (tree x, bool is_friend) |
a5e6b29b | 579 | { |
926ce8bd KH |
580 | tree t; |
581 | tree name; | |
a5e6b29b GDR |
582 | int need_new_binding; |
583 | ||
584 | timevar_push (TV_NAME_LOOKUP); | |
585 | ||
2a50edcd VR |
586 | if (x == error_mark_node) |
587 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
588 | ||
a5e6b29b GDR |
589 | need_new_binding = 1; |
590 | ||
591 | if (DECL_TEMPLATE_PARM_P (x)) | |
592 | /* Template parameters have no context; they are not X::T even | |
593 | when declared within a class or namespace. */ | |
594 | ; | |
595 | else | |
596 | { | |
597 | if (current_function_decl && x != current_function_decl | |
598 | /* A local declaration for a function doesn't constitute | |
0cbd7506 | 599 | nesting. */ |
4656bc85 | 600 | && TREE_CODE (x) != FUNCTION_DECL |
a5e6b29b GDR |
601 | /* A local declaration for an `extern' variable is in the |
602 | scope of the current namespace, not the current | |
603 | function. */ | |
604 | && !(TREE_CODE (x) == VAR_DECL && DECL_EXTERNAL (x)) | |
b344d949 JM |
605 | /* When parsing the parameter list of a function declarator, |
606 | don't set DECL_CONTEXT to an enclosing function. When we | |
607 | push the PARM_DECLs in order to process the function body, | |
608 | current_binding_level->this_entity will be set. */ | |
609 | && !(TREE_CODE (x) == PARM_DECL | |
610 | && current_binding_level->kind == sk_function_parms | |
611 | && current_binding_level->this_entity == NULL) | |
a5e6b29b GDR |
612 | && !DECL_CONTEXT (x)) |
613 | DECL_CONTEXT (x) = current_function_decl; | |
614 | ||
615 | /* If this is the declaration for a namespace-scope function, | |
616 | but the declaration itself is in a local scope, mark the | |
617 | declaration. */ | |
618 | if (TREE_CODE (x) == FUNCTION_DECL | |
619 | && DECL_NAMESPACE_SCOPE_P (x) | |
620 | && current_function_decl | |
621 | && x != current_function_decl) | |
622 | DECL_LOCAL_FUNCTION_P (x) = 1; | |
623 | } | |
624 | ||
625 | name = DECL_NAME (x); | |
626 | if (name) | |
627 | { | |
628 | int different_binding_level = 0; | |
629 | ||
630 | if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
631 | name = TREE_OPERAND (name, 0); | |
632 | ||
633 | /* In case this decl was explicitly namespace-qualified, look it | |
634 | up in its namespace context. */ | |
7813d14c | 635 | if (DECL_NAMESPACE_SCOPE_P (x) && namespace_bindings_p ()) |
a5e6b29b GDR |
636 | t = namespace_binding (name, DECL_CONTEXT (x)); |
637 | else | |
461c6fce | 638 | t = lookup_name_innermost_nonclass_level (name); |
a5e6b29b GDR |
639 | |
640 | /* [basic.link] If there is a visible declaration of an entity | |
641 | with linkage having the same name and type, ignoring entities | |
642 | declared outside the innermost enclosing namespace scope, the | |
643 | block scope declaration declares that same entity and | |
644 | receives the linkage of the previous declaration. */ | |
645 | if (! t && current_function_decl && x != current_function_decl | |
646 | && (TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL) | |
647 | && DECL_EXTERNAL (x)) | |
648 | { | |
649 | /* Look in block scope. */ | |
90ea9897 | 650 | t = innermost_non_namespace_value (name); |
a5e6b29b GDR |
651 | /* Or in the innermost namespace. */ |
652 | if (! t) | |
653 | t = namespace_binding (name, DECL_CONTEXT (x)); | |
654 | /* Does it have linkage? Note that if this isn't a DECL, it's an | |
655 | OVERLOAD, which is OK. */ | |
656 | if (t && DECL_P (t) && ! (TREE_STATIC (t) || DECL_EXTERNAL (t))) | |
657 | t = NULL_TREE; | |
658 | if (t) | |
659 | different_binding_level = 1; | |
660 | } | |
661 | ||
662 | /* If we are declaring a function, and the result of name-lookup | |
663 | was an OVERLOAD, look for an overloaded instance that is | |
664 | actually the same as the function we are declaring. (If | |
665 | there is one, we have to merge our declaration with the | |
666 | previous declaration.) */ | |
667 | if (t && TREE_CODE (t) == OVERLOAD) | |
668 | { | |
669 | tree match; | |
670 | ||
671 | if (TREE_CODE (x) == FUNCTION_DECL) | |
672 | for (match = t; match; match = OVL_NEXT (match)) | |
673 | { | |
674 | if (decls_match (OVL_CURRENT (match), x)) | |
675 | break; | |
676 | } | |
677 | else | |
678 | /* Just choose one. */ | |
679 | match = t; | |
680 | ||
681 | if (match) | |
682 | t = OVL_CURRENT (match); | |
683 | else | |
684 | t = NULL_TREE; | |
685 | } | |
686 | ||
58ec3cc5 | 687 | if (t && t != error_mark_node) |
a5e6b29b GDR |
688 | { |
689 | if (different_binding_level) | |
690 | { | |
691 | if (decls_match (x, t)) | |
692 | /* The standard only says that the local extern | |
693 | inherits linkage from the previous decl; in | |
10827cd8 JJ |
694 | particular, default args are not shared. Add |
695 | the decl into a hash table to make sure only | |
696 | the previous decl in this case is seen by the | |
697 | middle end. */ | |
84b8b0e0 | 698 | { |
10827cd8 JJ |
699 | struct cxx_int_tree_map *h; |
700 | void **loc; | |
701 | ||
84b8b0e0 | 702 | TREE_PUBLIC (x) = TREE_PUBLIC (t); |
10827cd8 JJ |
703 | |
704 | if (cp_function_chain->extern_decl_map == NULL) | |
705 | cp_function_chain->extern_decl_map | |
706 | = htab_create_ggc (20, cxx_int_tree_map_hash, | |
707 | cxx_int_tree_map_eq, NULL); | |
708 | ||
a9429e29 | 709 | h = ggc_alloc_cxx_int_tree_map (); |
10827cd8 JJ |
710 | h->uid = DECL_UID (x); |
711 | h->to = t; | |
712 | loc = htab_find_slot_with_hash | |
713 | (cp_function_chain->extern_decl_map, h, | |
714 | h->uid, INSERT); | |
715 | *(struct cxx_int_tree_map **) loc = h; | |
84b8b0e0 | 716 | } |
a5e6b29b GDR |
717 | } |
718 | else if (TREE_CODE (t) == PARM_DECL) | |
719 | { | |
a5e6b29b | 720 | /* Check for duplicate params. */ |
52a764ac L |
721 | tree d = duplicate_decls (x, t, is_friend); |
722 | if (d) | |
723 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, d); | |
a5e6b29b GDR |
724 | } |
725 | else if ((DECL_EXTERN_C_FUNCTION_P (x) | |
726 | || DECL_FUNCTION_TEMPLATE_P (x)) | |
727 | && is_overloaded_fn (t)) | |
728 | /* Don't do anything just yet. */; | |
729 | else if (t == wchar_decl_node) | |
730 | { | |
fcf73884 | 731 | if (! DECL_IN_SYSTEM_HEADER (x)) |
509c9d60 | 732 | pedwarn (input_location, OPT_pedantic, "redeclaration of %<wchar_t%> as %qT", |
0cbd7506 | 733 | TREE_TYPE (x)); |
fcf73884 | 734 | |
a5e6b29b GDR |
735 | /* Throw away the redeclaration. */ |
736 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
737 | } | |
b1a19c7c | 738 | else |
a5e6b29b | 739 | { |
d63d5d0c | 740 | tree olddecl = duplicate_decls (x, t, is_friend); |
c8094d83 | 741 | |
b1a19c7c MM |
742 | /* If the redeclaration failed, we can stop at this |
743 | point. */ | |
744 | if (olddecl == error_mark_node) | |
745 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
746 | ||
747 | if (olddecl) | |
748 | { | |
749 | if (TREE_CODE (t) == TYPE_DECL) | |
750 | SET_IDENTIFIER_TYPE_VALUE (name, TREE_TYPE (t)); | |
a5e6b29b | 751 | |
b1a19c7c MM |
752 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); |
753 | } | |
9d363a56 | 754 | else if (DECL_MAIN_P (x) && TREE_CODE (t) == FUNCTION_DECL) |
b1a19c7c MM |
755 | { |
756 | /* A redeclaration of main, but not a duplicate of the | |
757 | previous one. | |
c8094d83 | 758 | |
b1a19c7c | 759 | [basic.start.main] |
c8094d83 | 760 | |
b1a19c7c | 761 | This function shall not be overloaded. */ |
dee15844 | 762 | error ("invalid redeclaration of %q+D", t); |
2a13a625 | 763 | error ("as %qD", x); |
b1a19c7c MM |
764 | /* We don't try to push this declaration since that |
765 | causes a crash. */ | |
766 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
767 | } | |
a5e6b29b GDR |
768 | } |
769 | } | |
770 | ||
ecba6c56 DS |
771 | /* If x has C linkage-specification, (extern "C"), |
772 | lookup its binding, in case it's already bound to an object. | |
773 | The lookup is done in all namespaces. | |
774 | If we find an existing binding, make sure it has the same | |
775 | exception specification as x, otherwise, bail in error [7.5, 7.6]. */ | |
776 | if ((TREE_CODE (x) == FUNCTION_DECL) | |
777 | && DECL_EXTERN_C_P (x) | |
778 | /* We should ignore declarations happening in system headers. */ | |
a70f5987 | 779 | && !DECL_ARTIFICIAL (x) |
ecba6c56 DS |
780 | && !DECL_IN_SYSTEM_HEADER (x)) |
781 | { | |
782 | cxx_binding *function_binding = | |
783 | lookup_extern_c_fun_binding_in_all_ns (x); | |
a70f5987 JM |
784 | tree previous = (function_binding |
785 | ? function_binding->value | |
786 | : NULL_TREE); | |
787 | if (previous | |
788 | && !DECL_ARTIFICIAL (previous) | |
789 | && !DECL_IN_SYSTEM_HEADER (previous) | |
790 | && DECL_CONTEXT (previous) != DECL_CONTEXT (x)) | |
ecba6c56 DS |
791 | { |
792 | tree previous = function_binding->value; | |
793 | ||
794 | /* In case either x or previous is declared to throw an exception, | |
39a13be5 | 795 | make sure both exception specifications are equal. */ |
ecba6c56 DS |
796 | if (decls_match (x, previous)) |
797 | { | |
798 | tree x_exception_spec = NULL_TREE; | |
799 | tree previous_exception_spec = NULL_TREE; | |
800 | ||
801 | x_exception_spec = | |
802 | TYPE_RAISES_EXCEPTIONS (TREE_TYPE (x)); | |
803 | previous_exception_spec = | |
804 | TYPE_RAISES_EXCEPTIONS (TREE_TYPE (previous)); | |
805 | if (!comp_except_specs (previous_exception_spec, | |
806 | x_exception_spec, | |
3a55fb4c | 807 | ce_normal)) |
ecba6c56 | 808 | { |
509c9d60 | 809 | pedwarn (input_location, 0, "declaration of %q#D with C language linkage", |
fcf73884 | 810 | x); |
509c9d60 | 811 | pedwarn (input_location, 0, "conflicts with previous declaration %q+#D", |
fcf73884 | 812 | previous); |
509c9d60 | 813 | pedwarn (input_location, 0, "due to different exception specifications"); |
ecba6c56 DS |
814 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
815 | } | |
816 | } | |
a70f5987 JM |
817 | else |
818 | { | |
819 | pedwarn (input_location, 0, | |
820 | "declaration of %q#D with C language linkage", x); | |
821 | pedwarn (input_location, 0, | |
822 | "conflicts with previous declaration %q+#D", | |
823 | previous); | |
824 | } | |
ecba6c56 DS |
825 | } |
826 | } | |
827 | ||
a5e6b29b GDR |
828 | check_template_shadow (x); |
829 | ||
3b426391 | 830 | /* If this is a function conjured up by the back end, massage it |
a5e6b29b GDR |
831 | so it looks friendly. */ |
832 | if (DECL_NON_THUNK_FUNCTION_P (x) && ! DECL_LANG_SPECIFIC (x)) | |
833 | { | |
834 | retrofit_lang_decl (x); | |
835 | SET_DECL_LANGUAGE (x, lang_c); | |
836 | } | |
837 | ||
f7cbd40e | 838 | t = x; |
a5e6b29b GDR |
839 | if (DECL_NON_THUNK_FUNCTION_P (x) && ! DECL_FUNCTION_MEMBER_P (x)) |
840 | { | |
d63d5d0c | 841 | t = push_overloaded_decl (x, PUSH_LOCAL, is_friend); |
a5e6b29b GDR |
842 | if (!namespace_bindings_p ()) |
843 | /* We do not need to create a binding for this name; | |
844 | push_overloaded_decl will have already done so if | |
845 | necessary. */ | |
846 | need_new_binding = 0; | |
847 | } | |
848 | else if (DECL_FUNCTION_TEMPLATE_P (x) && DECL_NAMESPACE_SCOPE_P (x)) | |
849 | { | |
d63d5d0c | 850 | t = push_overloaded_decl (x, PUSH_GLOBAL, is_friend); |
a5e6b29b GDR |
851 | if (t == x) |
852 | add_decl_to_level (x, NAMESPACE_LEVEL (CP_DECL_CONTEXT (t))); | |
a5e6b29b GDR |
853 | } |
854 | ||
2e034e32 JJ |
855 | if (TREE_CODE (t) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (t)) |
856 | check_default_args (t); | |
f7cbd40e JM |
857 | |
858 | if (t != x || DECL_FUNCTION_TEMPLATE_P (t)) | |
859 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
860 | ||
a5e6b29b GDR |
861 | /* If declaring a type as a typedef, copy the type (unless we're |
862 | at line 0), and install this TYPE_DECL as the new type's typedef | |
d0940d56 | 863 | name. See the extensive comment of set_underlying_type (). */ |
a5e6b29b GDR |
864 | if (TREE_CODE (x) == TYPE_DECL) |
865 | { | |
866 | tree type = TREE_TYPE (x); | |
d0940d56 DS |
867 | |
868 | if (DECL_IS_BUILTIN (x) | |
869 | || (TREE_TYPE (x) != error_mark_node | |
870 | && TYPE_NAME (type) != x | |
871 | /* We don't want to copy the type when all we're | |
872 | doing is making a TYPE_DECL for the purposes of | |
873 | inlining. */ | |
874 | && (!TYPE_NAME (type) | |
875 | || TYPE_NAME (type) != DECL_ABSTRACT_ORIGIN (x)))) | |
6f1abb06 | 876 | set_underlying_type (x); |
a5e6b29b GDR |
877 | |
878 | if (type != error_mark_node | |
879 | && TYPE_NAME (type) | |
880 | && TYPE_IDENTIFIER (type)) | |
0cbd7506 | 881 | set_identifier_type_value (DECL_NAME (x), x); |
a5e6b29b GDR |
882 | } |
883 | ||
884 | /* Multiple external decls of the same identifier ought to match. | |
885 | ||
886 | We get warnings about inline functions where they are defined. | |
887 | We get warnings about other functions from push_overloaded_decl. | |
888 | ||
889 | Avoid duplicate warnings where they are used. */ | |
890 | if (TREE_PUBLIC (x) && TREE_CODE (x) != FUNCTION_DECL) | |
891 | { | |
892 | tree decl; | |
893 | ||
894 | decl = IDENTIFIER_NAMESPACE_VALUE (name); | |
895 | if (decl && TREE_CODE (decl) == OVERLOAD) | |
896 | decl = OVL_FUNCTION (decl); | |
897 | ||
898 | if (decl && decl != error_mark_node | |
899 | && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl)) | |
900 | /* If different sort of thing, we already gave an error. */ | |
901 | && TREE_CODE (decl) == TREE_CODE (x) | |
902 | && !same_type_p (TREE_TYPE (x), TREE_TYPE (decl))) | |
903 | { | |
cbe5f3b3 MLI |
904 | permerror (input_location, "type mismatch with previous external decl of %q#D", x); |
905 | permerror (input_location, "previous external decl of %q+#D", decl); | |
a5e6b29b GDR |
906 | } |
907 | } | |
908 | ||
d63d5d0c ILT |
909 | if (TREE_CODE (x) == FUNCTION_DECL |
910 | && is_friend | |
911 | && !flag_friend_injection) | |
912 | { | |
913 | /* This is a new declaration of a friend function, so hide | |
914 | it from ordinary function lookup. */ | |
915 | DECL_ANTICIPATED (x) = 1; | |
916 | DECL_HIDDEN_FRIEND_P (x) = 1; | |
917 | } | |
918 | ||
a5e6b29b GDR |
919 | /* This name is new in its binding level. |
920 | Install the new declaration and return it. */ | |
921 | if (namespace_bindings_p ()) | |
922 | { | |
923 | /* Install a global value. */ | |
924 | ||
925 | /* If the first global decl has external linkage, | |
926 | warn if we later see static one. */ | |
927 | if (IDENTIFIER_GLOBAL_VALUE (name) == NULL_TREE && TREE_PUBLIC (x)) | |
928 | TREE_PUBLIC (name) = 1; | |
929 | ||
0cbd7506 MS |
930 | /* Bind the name for the entity. */ |
931 | if (!(TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x) | |
932 | && t != NULL_TREE) | |
933 | && (TREE_CODE (x) == TYPE_DECL | |
934 | || TREE_CODE (x) == VAR_DECL | |
0cbd7506 MS |
935 | || TREE_CODE (x) == NAMESPACE_DECL |
936 | || TREE_CODE (x) == CONST_DECL | |
937 | || TREE_CODE (x) == TEMPLATE_DECL)) | |
938 | SET_IDENTIFIER_NAMESPACE_VALUE (name, x); | |
a5e6b29b | 939 | |
a5e6b29b GDR |
940 | /* If new decl is `static' and an `extern' was seen previously, |
941 | warn about it. */ | |
942 | if (x != NULL_TREE && t != NULL_TREE && decls_match (x, t)) | |
943 | warn_extern_redeclared_static (x, t); | |
944 | } | |
945 | else | |
946 | { | |
947 | /* Here to install a non-global value. */ | |
90ea9897 | 948 | tree oldlocal = innermost_non_namespace_value (name); |
a5e6b29b GDR |
949 | tree oldglobal = IDENTIFIER_NAMESPACE_VALUE (name); |
950 | ||
951 | if (need_new_binding) | |
952 | { | |
953 | push_local_binding (name, x, 0); | |
954 | /* Because push_local_binding will hook X on to the | |
955 | current_binding_level's name list, we don't want to | |
956 | do that again below. */ | |
957 | need_new_binding = 0; | |
958 | } | |
959 | ||
960 | /* If this is a TYPE_DECL, push it into the type value slot. */ | |
961 | if (TREE_CODE (x) == TYPE_DECL) | |
962 | set_identifier_type_value (name, x); | |
963 | ||
964 | /* Clear out any TYPE_DECL shadowed by a namespace so that | |
965 | we won't think this is a type. The C struct hack doesn't | |
966 | go through namespaces. */ | |
967 | if (TREE_CODE (x) == NAMESPACE_DECL) | |
968 | set_identifier_type_value (name, NULL_TREE); | |
969 | ||
970 | if (oldlocal) | |
971 | { | |
972 | tree d = oldlocal; | |
973 | ||
974 | while (oldlocal | |
975 | && TREE_CODE (oldlocal) == VAR_DECL | |
976 | && DECL_DEAD_FOR_LOCAL (oldlocal)) | |
977 | oldlocal = DECL_SHADOWED_FOR_VAR (oldlocal); | |
978 | ||
979 | if (oldlocal == NULL_TREE) | |
980 | oldlocal = IDENTIFIER_NAMESPACE_VALUE (DECL_NAME (d)); | |
981 | } | |
982 | ||
983 | /* If this is an extern function declaration, see if we | |
984 | have a global definition or declaration for the function. */ | |
985 | if (oldlocal == NULL_TREE | |
986 | && DECL_EXTERNAL (x) | |
987 | && oldglobal != NULL_TREE | |
988 | && TREE_CODE (x) == FUNCTION_DECL | |
989 | && TREE_CODE (oldglobal) == FUNCTION_DECL) | |
990 | { | |
991 | /* We have one. Their types must agree. */ | |
992 | if (decls_match (x, oldglobal)) | |
993 | /* OK */; | |
994 | else | |
995 | { | |
d8a07487 | 996 | warning (0, "extern declaration of %q#D doesn%'t match", x); |
dee15844 | 997 | warning (0, "global declaration %q+#D", oldglobal); |
a5e6b29b GDR |
998 | } |
999 | } | |
1000 | /* If we have a local external declaration, | |
1001 | and no file-scope declaration has yet been seen, | |
1002 | then if we later have a file-scope decl it must not be static. */ | |
1003 | if (oldlocal == NULL_TREE | |
1004 | && oldglobal == NULL_TREE | |
1005 | && DECL_EXTERNAL (x) | |
1006 | && TREE_PUBLIC (x)) | |
1007 | TREE_PUBLIC (name) = 1; | |
1008 | ||
f9b20c62 JM |
1009 | /* Don't complain about the parms we push and then pop |
1010 | while tentatively parsing a function declarator. */ | |
1011 | if (TREE_CODE (x) == PARM_DECL && DECL_CONTEXT (x) == NULL_TREE) | |
1012 | /* Ignore. */; | |
1013 | ||
a5e6b29b | 1014 | /* Warn if shadowing an argument at the top level of the body. */ |
f9b20c62 JM |
1015 | else if (oldlocal != NULL_TREE && !DECL_EXTERNAL (x) |
1016 | /* Inline decls shadow nothing. */ | |
1017 | && !DECL_FROM_INLINE (x) | |
74b80262 | 1018 | && (TREE_CODE (oldlocal) == PARM_DECL |
3f59fa1c LCW |
1019 | || TREE_CODE (oldlocal) == VAR_DECL |
1020 | /* If the old decl is a type decl, only warn if the | |
1021 | old decl is an explicit typedef or if both the old | |
1022 | and new decls are type decls. */ | |
1023 | || (TREE_CODE (oldlocal) == TYPE_DECL | |
1024 | && (!DECL_ARTIFICIAL (oldlocal) | |
1025 | || TREE_CODE (x) == TYPE_DECL))) | |
1026 | /* Don't check the `this' parameter or internally generated | |
1027 | vars unless it's an implicit typedef (see | |
1028 | create_implicit_typedef in decl.c). */ | |
1029 | && (!DECL_ARTIFICIAL (oldlocal) | |
1030 | || DECL_IMPLICIT_TYPEDEF_P (oldlocal)) | |
1031 | /* Don't check for internally generated vars unless | |
1032 | it's an implicit typedef (see create_implicit_typedef | |
1033 | in decl.c). */ | |
1034 | && (!DECL_ARTIFICIAL (x) || DECL_IMPLICIT_TYPEDEF_P (x))) | |
a5e6b29b | 1035 | { |
74b80262 | 1036 | bool nowarn = false; |
a5e6b29b GDR |
1037 | |
1038 | /* Don't complain if it's from an enclosing function. */ | |
1039 | if (DECL_CONTEXT (oldlocal) == current_function_decl | |
74b80262 SZ |
1040 | && TREE_CODE (x) != PARM_DECL |
1041 | && TREE_CODE (oldlocal) == PARM_DECL) | |
a5e6b29b GDR |
1042 | { |
1043 | /* Go to where the parms should be and see if we find | |
1044 | them there. */ | |
1045 | struct cp_binding_level *b = current_binding_level->level_chain; | |
1046 | ||
86ad3aa9 JM |
1047 | if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl)) |
1048 | /* Skip the ctor/dtor cleanup level. */ | |
1049 | b = b->level_chain; | |
a5e6b29b GDR |
1050 | |
1051 | /* ARM $8.3 */ | |
1052 | if (b->kind == sk_function_parms) | |
1053 | { | |
2a13a625 | 1054 | error ("declaration of %q#D shadows a parameter", x); |
74b80262 | 1055 | nowarn = true; |
a5e6b29b GDR |
1056 | } |
1057 | } | |
1058 | ||
74b80262 SZ |
1059 | /* The local structure or class can't use parameters of |
1060 | the containing function anyway. */ | |
1061 | if (DECL_CONTEXT (oldlocal) != current_function_decl) | |
a6f78652 | 1062 | { |
74b80262 SZ |
1063 | cxx_scope *scope = current_binding_level; |
1064 | tree context = DECL_CONTEXT (oldlocal); | |
1065 | for (; scope; scope = scope->level_chain) | |
1066 | { | |
1067 | if (scope->kind == sk_function_parms | |
1068 | && scope->this_entity == context) | |
1069 | break; | |
1070 | if (scope->kind == sk_class | |
1071 | && !LAMBDA_TYPE_P (scope->this_entity)) | |
1072 | { | |
1073 | nowarn = true; | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | if (warn_shadow && !nowarn) | |
1080 | { | |
1081 | if (TREE_CODE (oldlocal) == PARM_DECL) | |
1082 | warning_at (input_location, OPT_Wshadow, | |
1083 | "declaration of %q#D shadows a parameter", x); | |
1084 | else | |
1085 | warning_at (input_location, OPT_Wshadow, | |
1086 | "declaration of %qD shadows a previous local", | |
1087 | x); | |
1088 | warning_at (DECL_SOURCE_LOCATION (oldlocal), OPT_Wshadow, | |
1089 | "shadowed declaration is here"); | |
a6f78652 | 1090 | } |
a5e6b29b GDR |
1091 | } |
1092 | ||
1093 | /* Maybe warn if shadowing something else. */ | |
1094 | else if (warn_shadow && !DECL_EXTERNAL (x) | |
3f59fa1c LCW |
1095 | /* No shadow warnings for internally generated vars unless |
1096 | it's an implicit typedef (see create_implicit_typedef | |
1097 | in decl.c). */ | |
1098 | && (! DECL_ARTIFICIAL (x) || DECL_IMPLICIT_TYPEDEF_P (x)) | |
1099 | /* No shadow warnings for vars made for inlining. */ | |
1100 | && ! DECL_FROM_INLINE (x)) | |
a5e6b29b | 1101 | { |
39fb05d0 MM |
1102 | tree member; |
1103 | ||
1104 | if (current_class_ptr) | |
1105 | member = lookup_member (current_class_type, | |
1106 | name, | |
1107 | /*protect=*/0, | |
1108 | /*want_type=*/false); | |
1109 | else | |
1110 | member = NULL_TREE; | |
c8094d83 | 1111 | |
39fb05d0 | 1112 | if (member && !TREE_STATIC (member)) |
a6f78652 ZW |
1113 | { |
1114 | /* Location of previous decl is not useful in this case. */ | |
b323323f | 1115 | warning (OPT_Wshadow, "declaration of %qD shadows a member of 'this'", |
a6f78652 ZW |
1116 | x); |
1117 | } | |
a5e6b29b | 1118 | else if (oldglobal != NULL_TREE |
3f59fa1c LCW |
1119 | && (TREE_CODE (oldglobal) == VAR_DECL |
1120 | /* If the old decl is a type decl, only warn if the | |
1121 | old decl is an explicit typedef or if both the | |
1122 | old and new decls are type decls. */ | |
1123 | || (TREE_CODE (oldglobal) == TYPE_DECL | |
1124 | && (!DECL_ARTIFICIAL (oldglobal) | |
1125 | || TREE_CODE (x) == TYPE_DECL)))) | |
a5e6b29b | 1126 | /* XXX shadow warnings in outer-more namespaces */ |
a6f78652 | 1127 | { |
c5d75364 MLI |
1128 | warning_at (input_location, OPT_Wshadow, |
1129 | "declaration of %qD shadows a global declaration", x); | |
1130 | warning_at (DECL_SOURCE_LOCATION (oldglobal), OPT_Wshadow, | |
1131 | "shadowed declaration is here"); | |
a6f78652 | 1132 | } |
a5e6b29b GDR |
1133 | } |
1134 | } | |
1135 | ||
a5e6b29b GDR |
1136 | if (TREE_CODE (x) == VAR_DECL) |
1137 | maybe_register_incomplete_var (x); | |
1138 | } | |
1139 | ||
1140 | if (need_new_binding) | |
1141 | add_decl_to_level (x, | |
1142 | DECL_NAMESPACE_SCOPE_P (x) | |
1143 | ? NAMESPACE_LEVEL (CP_DECL_CONTEXT (x)) | |
1144 | : current_binding_level); | |
1145 | ||
1146 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
1147 | } | |
1148 | ||
d63d5d0c ILT |
1149 | /* Record a decl-node X as belonging to the current lexical scope. */ |
1150 | ||
1151 | tree | |
1152 | pushdecl (tree x) | |
1153 | { | |
1154 | return pushdecl_maybe_friend (x, false); | |
1155 | } | |
1156 | ||
a5e6b29b GDR |
1157 | /* Enter DECL into the symbol table, if that's appropriate. Returns |
1158 | DECL, or a modified version thereof. */ | |
1159 | ||
1160 | tree | |
1161 | maybe_push_decl (tree decl) | |
1162 | { | |
1163 | tree type = TREE_TYPE (decl); | |
1164 | ||
1165 | /* Add this decl to the current binding level, but not if it comes | |
1166 | from another scope, e.g. a static member variable. TEM may equal | |
1167 | DECL or it may be a previous decl of the same name. */ | |
1168 | if (decl == error_mark_node | |
1169 | || (TREE_CODE (decl) != PARM_DECL | |
1170 | && DECL_CONTEXT (decl) != NULL_TREE | |
1171 | /* Definitions of namespace members outside their namespace are | |
1172 | possible. */ | |
725214ac | 1173 | && !DECL_NAMESPACE_SCOPE_P (decl)) |
a5e6b29b | 1174 | || (TREE_CODE (decl) == TEMPLATE_DECL && !namespace_bindings_p ()) |
fbfc8363 | 1175 | || type == unknown_type_node |
a5e6b29b GDR |
1176 | /* The declaration of a template specialization does not affect |
1177 | the functions available for overload resolution, so we do not | |
1178 | call pushdecl. */ | |
1179 | || (TREE_CODE (decl) == FUNCTION_DECL | |
1180 | && DECL_TEMPLATE_SPECIALIZATION (decl))) | |
1181 | return decl; | |
1182 | else | |
1183 | return pushdecl (decl); | |
1184 | } | |
1185 | ||
00e8de68 GDR |
1186 | /* Bind DECL to ID in the current_binding_level, assumed to be a local |
1187 | binding level. If PUSH_USING is set in FLAGS, we know that DECL | |
1188 | doesn't really belong to this binding level, that it got here | |
1189 | through a using-declaration. */ | |
1190 | ||
58ec3cc5 | 1191 | void |
00e8de68 GDR |
1192 | push_local_binding (tree id, tree decl, int flags) |
1193 | { | |
1194 | struct cp_binding_level *b; | |
1195 | ||
1196 | /* Skip over any local classes. This makes sense if we call | |
1197 | push_local_binding with a friend decl of a local class. */ | |
1198 | b = innermost_nonclass_level (); | |
1199 | ||
461c6fce | 1200 | if (lookup_name_innermost_nonclass_level (id)) |
00e8de68 GDR |
1201 | { |
1202 | /* Supplement the existing binding. */ | |
1203 | if (!supplement_binding (IDENTIFIER_BINDING (id), decl)) | |
1204 | /* It didn't work. Something else must be bound at this | |
1205 | level. Do not add DECL to the list of things to pop | |
1206 | later. */ | |
1207 | return; | |
1208 | } | |
1209 | else | |
1210 | /* Create a new binding. */ | |
1211 | push_binding (id, decl, b); | |
1212 | ||
1213 | if (TREE_CODE (decl) == OVERLOAD || (flags & PUSH_USING)) | |
1214 | /* We must put the OVERLOAD into a TREE_LIST since the | |
1215 | TREE_CHAIN of an OVERLOAD is already used. Similarly for | |
1216 | decls that got here through a using-declaration. */ | |
1217 | decl = build_tree_list (NULL_TREE, decl); | |
1218 | ||
1219 | /* And put DECL on the list of things declared by the current | |
1220 | binding level. */ | |
1221 | add_decl_to_level (decl, b); | |
1222 | } | |
a5e6b29b | 1223 | |
a5e6b29b GDR |
1224 | /* Check to see whether or not DECL is a variable that would have been |
1225 | in scope under the ARM, but is not in scope under the ANSI/ISO | |
1226 | standard. If so, issue an error message. If name lookup would | |
1227 | work in both cases, but return a different result, this function | |
1228 | returns the result of ANSI/ISO lookup. Otherwise, it returns | |
1229 | DECL. */ | |
1230 | ||
1231 | tree | |
1232 | check_for_out_of_scope_variable (tree decl) | |
1233 | { | |
1234 | tree shadowed; | |
1235 | ||
1236 | /* We only care about out of scope variables. */ | |
1237 | if (!(TREE_CODE (decl) == VAR_DECL && DECL_DEAD_FOR_LOCAL (decl))) | |
1238 | return decl; | |
1239 | ||
3db45ab5 | 1240 | shadowed = DECL_HAS_SHADOWED_FOR_VAR_P (decl) |
820cc88f | 1241 | ? DECL_SHADOWED_FOR_VAR (decl) : NULL_TREE ; |
a5e6b29b GDR |
1242 | while (shadowed != NULL_TREE && TREE_CODE (shadowed) == VAR_DECL |
1243 | && DECL_DEAD_FOR_LOCAL (shadowed)) | |
3db45ab5 | 1244 | shadowed = DECL_HAS_SHADOWED_FOR_VAR_P (shadowed) |
820cc88f | 1245 | ? DECL_SHADOWED_FOR_VAR (shadowed) : NULL_TREE; |
a5e6b29b GDR |
1246 | if (!shadowed) |
1247 | shadowed = IDENTIFIER_NAMESPACE_VALUE (DECL_NAME (decl)); | |
1248 | if (shadowed) | |
1249 | { | |
1250 | if (!DECL_ERROR_REPORTED (decl)) | |
1251 | { | |
d4ee4d25 | 1252 | warning (0, "name lookup of %qD changed", DECL_NAME (decl)); |
dee15844 JM |
1253 | warning (0, " matches this %q+D under ISO standard rules", |
1254 | shadowed); | |
1255 | warning (0, " matches this %q+D under old rules", decl); | |
a5e6b29b GDR |
1256 | DECL_ERROR_REPORTED (decl) = 1; |
1257 | } | |
1258 | return shadowed; | |
1259 | } | |
1260 | ||
1261 | /* If we have already complained about this declaration, there's no | |
1262 | need to do it again. */ | |
1263 | if (DECL_ERROR_REPORTED (decl)) | |
1264 | return decl; | |
1265 | ||
1266 | DECL_ERROR_REPORTED (decl) = 1; | |
ae5cbc33 RS |
1267 | |
1268 | if (TREE_TYPE (decl) == error_mark_node) | |
1269 | return decl; | |
1270 | ||
a5e6b29b GDR |
1271 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) |
1272 | { | |
37ec60ed | 1273 | error ("name lookup of %qD changed for ISO %<for%> scoping", |
a5e6b29b | 1274 | DECL_NAME (decl)); |
dee15844 JM |
1275 | error (" cannot use obsolete binding at %q+D because " |
1276 | "it has a destructor", decl); | |
a5e6b29b GDR |
1277 | return error_mark_node; |
1278 | } | |
1279 | else | |
1280 | { | |
cbe5f3b3 | 1281 | permerror (input_location, "name lookup of %qD changed for ISO %<for%> scoping", |
37ec60ed JW |
1282 | DECL_NAME (decl)); |
1283 | if (flag_permissive) | |
cbe5f3b3 | 1284 | permerror (input_location, " using obsolete binding at %q+D", decl); |
37ec60ed JW |
1285 | else |
1286 | { | |
1287 | static bool hint; | |
1288 | if (!hint) | |
1289 | { | |
1f5b3869 | 1290 | inform (input_location, "(if you use %<-fpermissive%> G++ will accept your code)"); |
37ec60ed JW |
1291 | hint = true; |
1292 | } | |
1293 | } | |
a5e6b29b GDR |
1294 | } |
1295 | ||
1296 | return decl; | |
1297 | } | |
00e8de68 GDR |
1298 | \f |
1299 | /* true means unconditionally make a BLOCK for the next level pushed. */ | |
1300 | ||
1301 | static bool keep_next_level_flag; | |
1302 | ||
1303 | static int binding_depth = 0; | |
00e8de68 GDR |
1304 | |
1305 | static void | |
1306 | indent (int depth) | |
1307 | { | |
1308 | int i; | |
1309 | ||
1310 | for (i = 0; i < depth * 2; i++) | |
1311 | putc (' ', stderr); | |
1312 | } | |
1313 | ||
1314 | /* Return a string describing the kind of SCOPE we have. */ | |
1315 | static const char * | |
1316 | cxx_scope_descriptor (cxx_scope *scope) | |
1317 | { | |
1318 | /* The order of this table must match the "scope_kind" | |
1319 | enumerators. */ | |
1320 | static const char* scope_kind_names[] = { | |
1321 | "block-scope", | |
1322 | "cleanup-scope", | |
1323 | "try-scope", | |
1324 | "catch-scope", | |
1325 | "for-scope", | |
1326 | "function-parameter-scope", | |
1327 | "class-scope", | |
1328 | "namespace-scope", | |
1329 | "template-parameter-scope", | |
1330 | "template-explicit-spec-scope" | |
1331 | }; | |
1332 | const scope_kind kind = scope->explicit_spec_p | |
1333 | ? sk_template_spec : scope->kind; | |
1334 | ||
1335 | return scope_kind_names[kind]; | |
1336 | } | |
1337 | ||
cd0be382 | 1338 | /* Output a debugging information about SCOPE when performing |
00e8de68 GDR |
1339 | ACTION at LINE. */ |
1340 | static void | |
1341 | cxx_scope_debug (cxx_scope *scope, int line, const char *action) | |
1342 | { | |
1343 | const char *desc = cxx_scope_descriptor (scope); | |
1344 | if (scope->this_entity) | |
1345 | verbatim ("%s %s(%E) %p %d\n", action, desc, | |
0cbd7506 | 1346 | scope->this_entity, (void *) scope, line); |
00e8de68 GDR |
1347 | else |
1348 | verbatim ("%s %s %p %d\n", action, desc, (void *) scope, line); | |
1349 | } | |
1350 | ||
1351 | /* Return the estimated initial size of the hashtable of a NAMESPACE | |
1352 | scope. */ | |
1353 | ||
1354 | static inline size_t | |
1355 | namespace_scope_ht_size (tree ns) | |
1356 | { | |
1357 | tree name = DECL_NAME (ns); | |
1358 | ||
1359 | return name == std_identifier | |
1360 | ? NAMESPACE_STD_HT_SIZE | |
1361 | : (name == global_scope_name | |
1362 | ? GLOBAL_SCOPE_HT_SIZE | |
1363 | : NAMESPACE_ORDINARY_HT_SIZE); | |
1364 | } | |
1365 | ||
1366 | /* A chain of binding_level structures awaiting reuse. */ | |
1367 | ||
1431042e | 1368 | static GTY((deletable)) struct cp_binding_level *free_binding_level; |
00e8de68 | 1369 | |
89b578be MM |
1370 | /* Insert SCOPE as the innermost binding level. */ |
1371 | ||
1372 | void | |
1373 | push_binding_level (struct cp_binding_level *scope) | |
1374 | { | |
1375 | /* Add it to the front of currently active scopes stack. */ | |
1376 | scope->level_chain = current_binding_level; | |
1377 | current_binding_level = scope; | |
1378 | keep_next_level_flag = false; | |
1379 | ||
1380 | if (ENABLE_SCOPE_CHECKING) | |
1381 | { | |
1382 | scope->binding_depth = binding_depth; | |
1383 | indent (binding_depth); | |
1384 | cxx_scope_debug (scope, input_line, "push"); | |
89b578be MM |
1385 | binding_depth++; |
1386 | } | |
1387 | } | |
1388 | ||
00e8de68 GDR |
1389 | /* Create a new KIND scope and make it the top of the active scopes stack. |
1390 | ENTITY is the scope of the associated C++ entity (namespace, class, | |
adf2edec | 1391 | function, C++0x enumeration); it is NULL otherwise. */ |
00e8de68 GDR |
1392 | |
1393 | cxx_scope * | |
1394 | begin_scope (scope_kind kind, tree entity) | |
1395 | { | |
1396 | cxx_scope *scope; | |
c8094d83 | 1397 | |
00e8de68 GDR |
1398 | /* Reuse or create a struct for this binding level. */ |
1399 | if (!ENABLE_SCOPE_CHECKING && free_binding_level) | |
1400 | { | |
1401 | scope = free_binding_level; | |
b9eae1a9 | 1402 | memset (scope, 0, sizeof (cxx_scope)); |
00e8de68 GDR |
1403 | free_binding_level = scope->level_chain; |
1404 | } | |
1405 | else | |
a9429e29 | 1406 | scope = ggc_alloc_cleared_cxx_scope (); |
00e8de68 GDR |
1407 | |
1408 | scope->this_entity = entity; | |
1409 | scope->more_cleanups_ok = true; | |
1410 | switch (kind) | |
1411 | { | |
1412 | case sk_cleanup: | |
1413 | scope->keep = true; | |
1414 | break; | |
c8094d83 | 1415 | |
00e8de68 GDR |
1416 | case sk_template_spec: |
1417 | scope->explicit_spec_p = true; | |
1418 | kind = sk_template_parms; | |
f4f206f4 | 1419 | /* Fall through. */ |
00e8de68 GDR |
1420 | case sk_template_parms: |
1421 | case sk_block: | |
1422 | case sk_try: | |
1423 | case sk_catch: | |
1424 | case sk_for: | |
1425 | case sk_class: | |
adf2edec | 1426 | case sk_scoped_enum: |
00e8de68 | 1427 | case sk_function_parms: |
1799e5d5 | 1428 | case sk_omp: |
00e8de68 GDR |
1429 | scope->keep = keep_next_level_flag; |
1430 | break; | |
1431 | ||
1432 | case sk_namespace: | |
00e8de68 | 1433 | NAMESPACE_LEVEL (entity) = scope; |
9857866d KH |
1434 | scope->static_decls = |
1435 | VEC_alloc (tree, gc, | |
1436 | DECL_NAME (entity) == std_identifier | |
1437 | || DECL_NAME (entity) == global_scope_name | |
1438 | ? 200 : 10); | |
00e8de68 GDR |
1439 | break; |
1440 | ||
1441 | default: | |
1442 | /* Should not happen. */ | |
50bc768d | 1443 | gcc_unreachable (); |
00e8de68 GDR |
1444 | break; |
1445 | } | |
1446 | scope->kind = kind; | |
1447 | ||
89b578be | 1448 | push_binding_level (scope); |
00e8de68 GDR |
1449 | |
1450 | return scope; | |
1451 | } | |
1452 | ||
1453 | /* We're about to leave current scope. Pop the top of the stack of | |
1454 | currently active scopes. Return the enclosing scope, now active. */ | |
1455 | ||
1456 | cxx_scope * | |
1457 | leave_scope (void) | |
1458 | { | |
1459 | cxx_scope *scope = current_binding_level; | |
1460 | ||
1461 | if (scope->kind == sk_namespace && class_binding_level) | |
1462 | current_binding_level = class_binding_level; | |
1463 | ||
1464 | /* We cannot leave a scope, if there are none left. */ | |
1465 | if (NAMESPACE_LEVEL (global_namespace)) | |
50bc768d | 1466 | gcc_assert (!global_scope_p (scope)); |
c8094d83 | 1467 | |
00e8de68 GDR |
1468 | if (ENABLE_SCOPE_CHECKING) |
1469 | { | |
1470 | indent (--binding_depth); | |
93409b8c | 1471 | cxx_scope_debug (scope, input_line, "leave"); |
00e8de68 GDR |
1472 | } |
1473 | ||
1474 | /* Move one nesting level up. */ | |
1475 | current_binding_level = scope->level_chain; | |
1476 | ||
89b578be | 1477 | /* Namespace-scopes are left most probably temporarily, not |
0ed5edac | 1478 | completely; they can be reopened later, e.g. in namespace-extension |
89b578be MM |
1479 | or any name binding activity that requires us to resume a |
1480 | namespace. For classes, we cache some binding levels. For other | |
00e8de68 | 1481 | scopes, we just make the structure available for reuse. */ |
89b578be MM |
1482 | if (scope->kind != sk_namespace |
1483 | && scope->kind != sk_class) | |
00e8de68 GDR |
1484 | { |
1485 | scope->level_chain = free_binding_level; | |
50bc768d NS |
1486 | gcc_assert (!ENABLE_SCOPE_CHECKING |
1487 | || scope->binding_depth == binding_depth); | |
00e8de68 GDR |
1488 | free_binding_level = scope; |
1489 | } | |
1490 | ||
1491 | /* Find the innermost enclosing class scope, and reset | |
1492 | CLASS_BINDING_LEVEL appropriately. */ | |
5423d7eb RS |
1493 | if (scope->kind == sk_class) |
1494 | { | |
1495 | class_binding_level = NULL; | |
1496 | for (scope = current_binding_level; scope; scope = scope->level_chain) | |
1497 | if (scope->kind == sk_class) | |
1498 | { | |
1499 | class_binding_level = scope; | |
1500 | break; | |
1501 | } | |
1502 | } | |
00e8de68 GDR |
1503 | |
1504 | return current_binding_level; | |
1505 | } | |
1506 | ||
1507 | static void | |
1508 | resume_scope (struct cp_binding_level* b) | |
1509 | { | |
1510 | /* Resuming binding levels is meant only for namespaces, | |
1511 | and those cannot nest into classes. */ | |
50bc768d | 1512 | gcc_assert (!class_binding_level); |
00e8de68 | 1513 | /* Also, resuming a non-directly nested namespace is a no-no. */ |
50bc768d | 1514 | gcc_assert (b->level_chain == current_binding_level); |
00e8de68 GDR |
1515 | current_binding_level = b; |
1516 | if (ENABLE_SCOPE_CHECKING) | |
1517 | { | |
1518 | b->binding_depth = binding_depth; | |
1519 | indent (binding_depth); | |
93409b8c | 1520 | cxx_scope_debug (b, input_line, "resume"); |
00e8de68 GDR |
1521 | binding_depth++; |
1522 | } | |
1523 | } | |
1524 | ||
1525 | /* Return the innermost binding level that is not for a class scope. */ | |
1526 | ||
1527 | static cxx_scope * | |
1528 | innermost_nonclass_level (void) | |
1529 | { | |
1530 | cxx_scope *b; | |
1531 | ||
1532 | b = current_binding_level; | |
1533 | while (b->kind == sk_class) | |
1534 | b = b->level_chain; | |
1535 | ||
1536 | return b; | |
1537 | } | |
1538 | ||
1539 | /* We're defining an object of type TYPE. If it needs a cleanup, but | |
1540 | we're not allowed to add any more objects with cleanups to the current | |
1541 | scope, create a new binding level. */ | |
1542 | ||
1543 | void | |
1544 | maybe_push_cleanup_level (tree type) | |
1545 | { | |
bb8b4ed6 MM |
1546 | if (type != error_mark_node |
1547 | && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) | |
00e8de68 GDR |
1548 | && current_binding_level->more_cleanups_ok == 0) |
1549 | { | |
1550 | begin_scope (sk_cleanup, NULL); | |
325c3691 | 1551 | current_binding_level->statement_list = push_stmt_list (); |
00e8de68 GDR |
1552 | } |
1553 | } | |
1554 | ||
1555 | /* Nonzero if we are currently in the global binding level. */ | |
1556 | ||
1557 | int | |
1558 | global_bindings_p (void) | |
1559 | { | |
1560 | return global_scope_p (current_binding_level); | |
1561 | } | |
1562 | ||
1563 | /* True if we are currently in a toplevel binding level. This | |
1564 | means either the global binding level or a namespace in a toplevel | |
1565 | binding level. Since there are no non-toplevel namespace levels, | |
1566 | this really means any namespace or template parameter level. We | |
1567 | also include a class whose context is toplevel. */ | |
1568 | ||
1569 | bool | |
1570 | toplevel_bindings_p (void) | |
1571 | { | |
1572 | struct cp_binding_level *b = innermost_nonclass_level (); | |
1573 | ||
1574 | return b->kind == sk_namespace || b->kind == sk_template_parms; | |
1575 | } | |
1576 | ||
1577 | /* True if this is a namespace scope, or if we are defining a class | |
1578 | which is itself at namespace scope, or whose enclosing class is | |
1579 | such a class, etc. */ | |
1580 | ||
1581 | bool | |
1582 | namespace_bindings_p (void) | |
1583 | { | |
1584 | struct cp_binding_level *b = innermost_nonclass_level (); | |
1585 | ||
1586 | return b->kind == sk_namespace; | |
1587 | } | |
1588 | ||
1589 | /* True if the current level needs to have a BLOCK made. */ | |
1590 | ||
1591 | bool | |
1592 | kept_level_p (void) | |
1593 | { | |
1594 | return (current_binding_level->blocks != NULL_TREE | |
1595 | || current_binding_level->keep | |
0cbd7506 | 1596 | || current_binding_level->kind == sk_cleanup |
2ac1e975 DS |
1597 | || current_binding_level->names != NULL_TREE |
1598 | || current_binding_level->using_directives); | |
00e8de68 GDR |
1599 | } |
1600 | ||
1601 | /* Returns the kind of the innermost scope. */ | |
1602 | ||
1603 | scope_kind | |
1604 | innermost_scope_kind (void) | |
1605 | { | |
1606 | return current_binding_level->kind; | |
1607 | } | |
1608 | ||
1609 | /* Returns true if this scope was created to store template parameters. */ | |
1610 | ||
1611 | bool | |
1612 | template_parm_scope_p (void) | |
1613 | { | |
1614 | return innermost_scope_kind () == sk_template_parms; | |
1615 | } | |
1616 | ||
1617 | /* If KEEP is true, make a BLOCK node for the next binding level, | |
1618 | unconditionally. Otherwise, use the normal logic to decide whether | |
1619 | or not to create a BLOCK. */ | |
1620 | ||
1621 | void | |
1622 | keep_next_level (bool keep) | |
1623 | { | |
1624 | keep_next_level_flag = keep; | |
1625 | } | |
1626 | ||
1627 | /* Return the list of declarations of the current level. | |
1628 | Note that this list is in reverse order unless/until | |
1629 | you nreverse it; and when you do nreverse it, you must | |
1630 | store the result back using `storedecls' or you will lose. */ | |
1631 | ||
1632 | tree | |
1633 | getdecls (void) | |
1634 | { | |
1635 | return current_binding_level->names; | |
1636 | } | |
1637 | ||
67e18edb JM |
1638 | /* Return how many function prototypes we are currently nested inside. */ |
1639 | ||
1640 | int | |
1641 | function_parm_depth (void) | |
1642 | { | |
1643 | int level = 0; | |
1644 | struct cp_binding_level *b; | |
1645 | ||
1646 | for (b = current_binding_level; | |
1647 | b->kind == sk_function_parms; | |
1648 | b = b->level_chain) | |
1649 | ++level; | |
1650 | ||
1651 | return level; | |
1652 | } | |
1653 | ||
00e8de68 GDR |
1654 | /* For debugging. */ |
1655 | static int no_print_functions = 0; | |
1656 | static int no_print_builtins = 0; | |
1657 | ||
b8c1703b | 1658 | static void |
00e8de68 GDR |
1659 | print_binding_level (struct cp_binding_level* lvl) |
1660 | { | |
1661 | tree t; | |
1662 | int i = 0, len; | |
06145cb9 | 1663 | fprintf (stderr, " blocks=%p", (void *) lvl->blocks); |
00e8de68 GDR |
1664 | if (lvl->more_cleanups_ok) |
1665 | fprintf (stderr, " more-cleanups-ok"); | |
1666 | if (lvl->have_cleanups) | |
1667 | fprintf (stderr, " have-cleanups"); | |
1668 | fprintf (stderr, "\n"); | |
1669 | if (lvl->names) | |
1670 | { | |
1671 | fprintf (stderr, " names:\t"); | |
1672 | /* We can probably fit 3 names to a line? */ | |
1673 | for (t = lvl->names; t; t = TREE_CHAIN (t)) | |
1674 | { | |
1675 | if (no_print_functions && (TREE_CODE (t) == FUNCTION_DECL)) | |
1676 | continue; | |
1677 | if (no_print_builtins | |
1678 | && (TREE_CODE (t) == TYPE_DECL) | |
93409b8c | 1679 | && DECL_IS_BUILTIN (t)) |
00e8de68 GDR |
1680 | continue; |
1681 | ||
1682 | /* Function decls tend to have longer names. */ | |
1683 | if (TREE_CODE (t) == FUNCTION_DECL) | |
1684 | len = 3; | |
1685 | else | |
1686 | len = 2; | |
1687 | i += len; | |
1688 | if (i > 6) | |
1689 | { | |
1690 | fprintf (stderr, "\n\t"); | |
1691 | i = len; | |
1692 | } | |
1693 | print_node_brief (stderr, "", t, 0); | |
1694 | if (t == error_mark_node) | |
1695 | break; | |
1696 | } | |
1697 | if (i) | |
0cbd7506 | 1698 | fprintf (stderr, "\n"); |
00e8de68 | 1699 | } |
89b578be | 1700 | if (VEC_length (cp_class_binding, lvl->class_shadowed)) |
00e8de68 | 1701 | { |
89b578be MM |
1702 | size_t i; |
1703 | cp_class_binding *b; | |
00e8de68 | 1704 | fprintf (stderr, " class-shadowed:"); |
ac47786e | 1705 | FOR_EACH_VEC_ELT (cp_class_binding, lvl->class_shadowed, i, b) |
89b578be | 1706 | fprintf (stderr, " %s ", IDENTIFIER_POINTER (b->identifier)); |
00e8de68 GDR |
1707 | fprintf (stderr, "\n"); |
1708 | } | |
1709 | if (lvl->type_shadowed) | |
1710 | { | |
1711 | fprintf (stderr, " type-shadowed:"); | |
1712 | for (t = lvl->type_shadowed; t; t = TREE_CHAIN (t)) | |
0cbd7506 | 1713 | { |
00e8de68 | 1714 | fprintf (stderr, " %s ", IDENTIFIER_POINTER (TREE_PURPOSE (t))); |
0cbd7506 | 1715 | } |
00e8de68 GDR |
1716 | fprintf (stderr, "\n"); |
1717 | } | |
1718 | } | |
1719 | ||
1720 | void | |
1721 | print_other_binding_stack (struct cp_binding_level *stack) | |
1722 | { | |
1723 | struct cp_binding_level *level; | |
1724 | for (level = stack; !global_scope_p (level); level = level->level_chain) | |
1725 | { | |
06145cb9 | 1726 | fprintf (stderr, "binding level %p\n", (void *) level); |
00e8de68 GDR |
1727 | print_binding_level (level); |
1728 | } | |
1729 | } | |
1730 | ||
1731 | void | |
1732 | print_binding_stack (void) | |
1733 | { | |
1734 | struct cp_binding_level *b; | |
06145cb9 KG |
1735 | fprintf (stderr, "current_binding_level=%p\n" |
1736 | "class_binding_level=%p\n" | |
1737 | "NAMESPACE_LEVEL (global_namespace)=%p\n", | |
00e8de68 | 1738 | (void *) current_binding_level, (void *) class_binding_level, |
0cbd7506 | 1739 | (void *) NAMESPACE_LEVEL (global_namespace)); |
00e8de68 GDR |
1740 | if (class_binding_level) |
1741 | { | |
1742 | for (b = class_binding_level; b; b = b->level_chain) | |
1743 | if (b == current_binding_level) | |
1744 | break; | |
1745 | if (b) | |
1746 | b = class_binding_level; | |
1747 | else | |
1748 | b = current_binding_level; | |
1749 | } | |
1750 | else | |
1751 | b = current_binding_level; | |
1752 | print_other_binding_stack (b); | |
1753 | fprintf (stderr, "global:\n"); | |
1754 | print_binding_level (NAMESPACE_LEVEL (global_namespace)); | |
1755 | } | |
ed3cf953 | 1756 | \f |
00e8de68 GDR |
1757 | /* Return the type associated with id. */ |
1758 | ||
1759 | tree | |
1760 | identifier_type_value (tree id) | |
1761 | { | |
1762 | timevar_push (TV_NAME_LOOKUP); | |
1763 | /* There is no type with that name, anywhere. */ | |
1764 | if (REAL_IDENTIFIER_TYPE_VALUE (id) == NULL_TREE) | |
1765 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
1766 | /* This is not the type marker, but the real thing. */ | |
1767 | if (REAL_IDENTIFIER_TYPE_VALUE (id) != global_type_node) | |
1768 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, REAL_IDENTIFIER_TYPE_VALUE (id)); | |
1769 | /* Have to search for it. It must be on the global level, now. | |
1770 | Ask lookup_name not to return non-types. */ | |
12cf89fa | 1771 | id = lookup_name_real (id, 2, 1, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
1772 | if (id) |
1773 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, TREE_TYPE (id)); | |
1774 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
1775 | } | |
1776 | ||
1777 | /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since | |
1778 | the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */ | |
1779 | ||
1780 | tree | |
1781 | identifier_global_value (tree t) | |
1782 | { | |
1783 | return IDENTIFIER_GLOBAL_VALUE (t); | |
1784 | } | |
1785 | ||
1786 | /* Push a definition of struct, union or enum tag named ID. into | |
1787 | binding_level B. DECL is a TYPE_DECL for the type. We assume that | |
1788 | the tag ID is not already defined. */ | |
1789 | ||
1790 | static void | |
1791 | set_identifier_type_value_with_scope (tree id, tree decl, cxx_scope *b) | |
1792 | { | |
1793 | tree type; | |
1794 | ||
1795 | if (b->kind != sk_namespace) | |
1796 | { | |
1797 | /* Shadow the marker, not the real thing, so that the marker | |
1798 | gets restored later. */ | |
1799 | tree old_type_value = REAL_IDENTIFIER_TYPE_VALUE (id); | |
1800 | b->type_shadowed | |
1801 | = tree_cons (id, old_type_value, b->type_shadowed); | |
1802 | type = decl ? TREE_TYPE (decl) : NULL_TREE; | |
39fb05d0 | 1803 | TREE_TYPE (b->type_shadowed) = type; |
00e8de68 GDR |
1804 | } |
1805 | else | |
1806 | { | |
1807 | cxx_binding *binding = | |
1808 | binding_for_name (NAMESPACE_LEVEL (current_namespace), id); | |
315fb5db NS |
1809 | gcc_assert (decl); |
1810 | if (binding->value) | |
1811 | supplement_binding (binding, decl); | |
00e8de68 | 1812 | else |
315fb5db | 1813 | binding->value = decl; |
c8094d83 | 1814 | |
00e8de68 GDR |
1815 | /* Store marker instead of real type. */ |
1816 | type = global_type_node; | |
1817 | } | |
1818 | SET_IDENTIFIER_TYPE_VALUE (id, type); | |
1819 | } | |
1820 | ||
1821 | /* As set_identifier_type_value_with_scope, but using | |
1822 | current_binding_level. */ | |
1823 | ||
1824 | void | |
1825 | set_identifier_type_value (tree id, tree decl) | |
1826 | { | |
1827 | set_identifier_type_value_with_scope (id, decl, current_binding_level); | |
1828 | } | |
1829 | ||
5a167978 GDR |
1830 | /* Return the name for the constructor (or destructor) for the |
1831 | specified class TYPE. When given a template, this routine doesn't | |
1832 | lose the specialization. */ | |
1833 | ||
b8c1703b | 1834 | static inline tree |
5a167978 GDR |
1835 | constructor_name_full (tree type) |
1836 | { | |
508a1c9c | 1837 | return TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (type)); |
5a167978 GDR |
1838 | } |
1839 | ||
1840 | /* Return the name for the constructor (or destructor) for the | |
1841 | specified class. When given a template, return the plain | |
1842 | unspecialized name. */ | |
1843 | ||
1844 | tree | |
1845 | constructor_name (tree type) | |
1846 | { | |
1847 | tree name; | |
1848 | name = constructor_name_full (type); | |
1849 | if (IDENTIFIER_TEMPLATE (name)) | |
1850 | name = IDENTIFIER_TEMPLATE (name); | |
1851 | return name; | |
1852 | } | |
1853 | ||
dbc21af5 PC |
1854 | /* Returns TRUE if NAME is the name for the constructor for TYPE, |
1855 | which must be a class type. */ | |
5a167978 GDR |
1856 | |
1857 | bool | |
1858 | constructor_name_p (tree name, tree type) | |
1859 | { | |
1860 | tree ctor_name; | |
1861 | ||
9e1e64ec | 1862 | gcc_assert (MAYBE_CLASS_TYPE_P (type)); |
dbc21af5 | 1863 | |
5a167978 GDR |
1864 | if (!name) |
1865 | return false; | |
c8094d83 | 1866 | |
5a167978 GDR |
1867 | if (TREE_CODE (name) != IDENTIFIER_NODE) |
1868 | return false; | |
c8094d83 | 1869 | |
5a167978 GDR |
1870 | ctor_name = constructor_name_full (type); |
1871 | if (name == ctor_name) | |
1872 | return true; | |
1873 | if (IDENTIFIER_TEMPLATE (ctor_name) | |
1874 | && name == IDENTIFIER_TEMPLATE (ctor_name)) | |
1875 | return true; | |
1876 | return false; | |
1877 | } | |
1878 | ||
a5e6b29b GDR |
1879 | /* Counter used to create anonymous type names. */ |
1880 | ||
1881 | static GTY(()) int anon_cnt; | |
1882 | ||
1883 | /* Return an IDENTIFIER which can be used as a name for | |
1884 | anonymous structs and unions. */ | |
1885 | ||
1886 | tree | |
1887 | make_anon_name (void) | |
1888 | { | |
1889 | char buf[32]; | |
1890 | ||
1891 | sprintf (buf, ANON_AGGRNAME_FORMAT, anon_cnt++); | |
1892 | return get_identifier (buf); | |
1893 | } | |
1894 | ||
d5f4eddd JM |
1895 | /* This code is practically identical to that for creating |
1896 | anonymous names, but is just used for lambdas instead. This is necessary | |
1897 | because anonymous names are recognized and cannot be passed to template | |
1898 | functions. */ | |
1899 | /* FIXME is this still necessary? */ | |
1900 | ||
1901 | static GTY(()) int lambda_cnt = 0; | |
1902 | ||
1903 | tree | |
1904 | make_lambda_name (void) | |
1905 | { | |
1906 | char buf[32]; | |
1907 | ||
1908 | sprintf (buf, LAMBDANAME_FORMAT, lambda_cnt++); | |
1909 | return get_identifier (buf); | |
1910 | } | |
1911 | ||
c8094d83 | 1912 | /* Return (from the stack of) the BINDING, if any, established at SCOPE. */ |
ed3cf953 GDR |
1913 | |
1914 | static inline cxx_binding * | |
1915 | find_binding (cxx_scope *scope, cxx_binding *binding) | |
1916 | { | |
1917 | timevar_push (TV_NAME_LOOKUP); | |
1918 | ||
1919 | for (; binding != NULL; binding = binding->previous) | |
147135cc | 1920 | if (binding->scope == scope) |
ed3cf953 GDR |
1921 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, binding); |
1922 | ||
da247ccc | 1923 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, (cxx_binding *)0); |
ed3cf953 GDR |
1924 | } |
1925 | ||
1926 | /* Return the binding for NAME in SCOPE, if any. Otherwise, return NULL. */ | |
daafa301 | 1927 | |
5a167978 | 1928 | static inline cxx_binding * |
ed3cf953 GDR |
1929 | cxx_scope_find_binding_for_name (cxx_scope *scope, tree name) |
1930 | { | |
1931 | cxx_binding *b = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
1932 | if (b) | |
1933 | { | |
1934 | /* Fold-in case where NAME is used only once. */ | |
147135cc | 1935 | if (scope == b->scope && b->previous == NULL) |
0cbd7506 | 1936 | return b; |
ed3cf953 GDR |
1937 | return find_binding (scope, b); |
1938 | } | |
1939 | return NULL; | |
1940 | } | |
1941 | ||
1942 | /* Always returns a binding for name in scope. If no binding is | |
1943 | found, make a new one. */ | |
1944 | ||
5a167978 | 1945 | static cxx_binding * |
ed3cf953 GDR |
1946 | binding_for_name (cxx_scope *scope, tree name) |
1947 | { | |
1948 | cxx_binding *result; | |
1949 | ||
1950 | result = cxx_scope_find_binding_for_name (scope, name); | |
1951 | if (result) | |
1952 | return result; | |
1953 | /* Not found, make a new one. */ | |
1954 | result = cxx_binding_make (NULL, NULL); | |
1955 | result->previous = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
147135cc | 1956 | result->scope = scope; |
ed3cf953 GDR |
1957 | result->is_local = false; |
1958 | result->value_is_inherited = false; | |
1959 | IDENTIFIER_NAMESPACE_BINDINGS (name) = result; | |
1960 | return result; | |
1961 | } | |
ed3cf953 | 1962 | |
ecba6c56 DS |
1963 | /* Walk through the bindings associated to the name of FUNCTION, |
1964 | and return the first binding that declares a function with a | |
1965 | "C" linkage specification, a.k.a 'extern "C"'. | |
1966 | This function looks for the binding, regardless of which scope it | |
1967 | has been defined in. It basically looks in all the known scopes. | |
1968 | Note that this function does not lookup for bindings of builtin functions | |
1969 | or for functions declared in system headers. */ | |
1970 | static cxx_binding* | |
1971 | lookup_extern_c_fun_binding_in_all_ns (tree function) | |
1972 | { | |
1973 | tree name; | |
1974 | cxx_binding *iter; | |
1975 | ||
1976 | gcc_assert (function && TREE_CODE (function) == FUNCTION_DECL); | |
1977 | ||
1978 | name = DECL_NAME (function); | |
1979 | gcc_assert (name && TREE_CODE (name) == IDENTIFIER_NODE); | |
1980 | ||
1981 | for (iter = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
1982 | iter; | |
1983 | iter = iter->previous) | |
1984 | { | |
1985 | if (iter->value | |
1986 | && TREE_CODE (iter->value) == FUNCTION_DECL | |
1987 | && DECL_EXTERN_C_P (iter->value) | |
1988 | && !DECL_ARTIFICIAL (iter->value)) | |
1989 | { | |
1990 | return iter; | |
1991 | } | |
1992 | } | |
1993 | return NULL; | |
1994 | } | |
1995 | ||
a5e6b29b GDR |
1996 | /* Insert another USING_DECL into the current binding level, returning |
1997 | this declaration. If this is a redeclaration, do nothing, and | |
1998 | return NULL_TREE if this not in namespace scope (in namespace | |
1999 | scope, a using decl might extend any previous bindings). */ | |
2000 | ||
b5791fdc | 2001 | static tree |
a5e6b29b GDR |
2002 | push_using_decl (tree scope, tree name) |
2003 | { | |
2004 | tree decl; | |
2005 | ||
2006 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d NS |
2007 | gcc_assert (TREE_CODE (scope) == NAMESPACE_DECL); |
2008 | gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); | |
910ad8de | 2009 | for (decl = current_binding_level->usings; decl; decl = DECL_CHAIN (decl)) |
98ed9dae | 2010 | if (USING_DECL_SCOPE (decl) == scope && DECL_NAME (decl) == name) |
a5e6b29b GDR |
2011 | break; |
2012 | if (decl) | |
2013 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 2014 | namespace_bindings_p () ? decl : NULL_TREE); |
98ed9dae NS |
2015 | decl = build_lang_decl (USING_DECL, name, NULL_TREE); |
2016 | USING_DECL_SCOPE (decl) = scope; | |
910ad8de | 2017 | DECL_CHAIN (decl) = current_binding_level->usings; |
a5e6b29b GDR |
2018 | current_binding_level->usings = decl; |
2019 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
2020 | } | |
2021 | ||
00e8de68 GDR |
2022 | /* Same as pushdecl, but define X in binding-level LEVEL. We rely on the |
2023 | caller to set DECL_CONTEXT properly. */ | |
ed3cf953 GDR |
2024 | |
2025 | tree | |
d63d5d0c | 2026 | pushdecl_with_scope (tree x, cxx_scope *level, bool is_friend) |
ed3cf953 | 2027 | { |
926ce8bd | 2028 | struct cp_binding_level *b; |
00e8de68 | 2029 | tree function_decl = current_function_decl; |
ed3cf953 | 2030 | |
00e8de68 GDR |
2031 | timevar_push (TV_NAME_LOOKUP); |
2032 | current_function_decl = NULL_TREE; | |
2033 | if (level->kind == sk_class) | |
2034 | { | |
2035 | b = class_binding_level; | |
2036 | class_binding_level = level; | |
2037 | pushdecl_class_level (x); | |
2038 | class_binding_level = b; | |
2039 | } | |
2040 | else | |
2041 | { | |
2042 | b = current_binding_level; | |
2043 | current_binding_level = level; | |
d63d5d0c | 2044 | x = pushdecl_maybe_friend (x, is_friend); |
00e8de68 GDR |
2045 | current_binding_level = b; |
2046 | } | |
2047 | current_function_decl = function_decl; | |
2048 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
2049 | } | |
2050 | ||
a5e6b29b GDR |
2051 | /* DECL is a FUNCTION_DECL for a non-member function, which may have |
2052 | other definitions already in place. We get around this by making | |
2053 | the value of the identifier point to a list of all the things that | |
2054 | want to be referenced by that name. It is then up to the users of | |
2055 | that name to decide what to do with that list. | |
2056 | ||
2057 | DECL may also be a TEMPLATE_DECL, with a FUNCTION_DECL in its | |
2058 | DECL_TEMPLATE_RESULT. It is dealt with the same way. | |
2059 | ||
2060 | FLAGS is a bitwise-or of the following values: | |
2061 | PUSH_LOCAL: Bind DECL in the current scope, rather than at | |
0cbd7506 | 2062 | namespace scope. |
a5e6b29b | 2063 | PUSH_USING: DECL is being pushed as the result of a using |
0cbd7506 | 2064 | declaration. |
a5e6b29b | 2065 | |
d63d5d0c ILT |
2066 | IS_FRIEND is true if this is a friend declaration. |
2067 | ||
a5e6b29b GDR |
2068 | The value returned may be a previous declaration if we guessed wrong |
2069 | about what language DECL should belong to (C or C++). Otherwise, | |
2070 | it's always DECL (and never something that's not a _DECL). */ | |
2071 | ||
2072 | static tree | |
d63d5d0c | 2073 | push_overloaded_decl (tree decl, int flags, bool is_friend) |
a5e6b29b GDR |
2074 | { |
2075 | tree name = DECL_NAME (decl); | |
2076 | tree old; | |
2077 | tree new_binding; | |
2078 | int doing_global = (namespace_bindings_p () || !(flags & PUSH_LOCAL)); | |
2079 | ||
2080 | timevar_push (TV_NAME_LOOKUP); | |
2081 | if (doing_global) | |
2082 | old = namespace_binding (name, DECL_CONTEXT (decl)); | |
2083 | else | |
461c6fce | 2084 | old = lookup_name_innermost_nonclass_level (name); |
a5e6b29b GDR |
2085 | |
2086 | if (old) | |
2087 | { | |
2088 | if (TREE_CODE (old) == TYPE_DECL && DECL_ARTIFICIAL (old)) | |
2089 | { | |
2090 | tree t = TREE_TYPE (old); | |
9e1e64ec | 2091 | if (MAYBE_CLASS_TYPE_P (t) && warn_shadow |
a5e6b29b GDR |
2092 | && (! DECL_IN_SYSTEM_HEADER (decl) |
2093 | || ! DECL_IN_SYSTEM_HEADER (old))) | |
683d6ff9 | 2094 | warning (OPT_Wshadow, "%q#D hides constructor for %q#T", decl, t); |
a5e6b29b GDR |
2095 | old = NULL_TREE; |
2096 | } | |
2097 | else if (is_overloaded_fn (old)) | |
0cbd7506 MS |
2098 | { |
2099 | tree tmp; | |
a5e6b29b GDR |
2100 | |
2101 | for (tmp = old; tmp; tmp = OVL_NEXT (tmp)) | |
2102 | { | |
2103 | tree fn = OVL_CURRENT (tmp); | |
7ca383e6 | 2104 | tree dup; |
a5e6b29b GDR |
2105 | |
2106 | if (TREE_CODE (tmp) == OVERLOAD && OVL_USED (tmp) | |
2107 | && !(flags & PUSH_USING) | |
2108 | && compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
713101a6 AO |
2109 | TYPE_ARG_TYPES (TREE_TYPE (decl))) |
2110 | && ! decls_match (fn, decl)) | |
2a13a625 | 2111 | error ("%q#D conflicts with previous using declaration %q#D", |
0cbd7506 | 2112 | decl, fn); |
a5e6b29b | 2113 | |
7ca383e6 MM |
2114 | dup = duplicate_decls (decl, fn, is_friend); |
2115 | /* If DECL was a redeclaration of FN -- even an invalid | |
2116 | one -- pass that information along to our caller. */ | |
2117 | if (dup == fn || dup == error_mark_node) | |
2118 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, dup); | |
a5e6b29b | 2119 | } |
1a32490a AO |
2120 | |
2121 | /* We don't overload implicit built-ins. duplicate_decls() | |
2122 | may fail to merge the decls if the new decl is e.g. a | |
2123 | template function. */ | |
2124 | if (TREE_CODE (old) == FUNCTION_DECL | |
d63d5d0c ILT |
2125 | && DECL_ANTICIPATED (old) |
2126 | && !DECL_HIDDEN_FRIEND_P (old)) | |
1a32490a | 2127 | old = NULL; |
a5e6b29b GDR |
2128 | } |
2129 | else if (old == error_mark_node) | |
2130 | /* Ignore the undefined symbol marker. */ | |
2131 | old = NULL_TREE; | |
2132 | else | |
2133 | { | |
dee15844 | 2134 | error ("previous non-function declaration %q+#D", old); |
2a13a625 | 2135 | error ("conflicts with function declaration %q#D", decl); |
a5e6b29b GDR |
2136 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); |
2137 | } | |
2138 | } | |
2139 | ||
f3162000 GB |
2140 | if (old || TREE_CODE (decl) == TEMPLATE_DECL |
2141 | /* If it's a using declaration, we always need to build an OVERLOAD, | |
2142 | because it's the only way to remember that the declaration comes | |
2143 | from 'using', and have the lookup behave correctly. */ | |
2144 | || (flags & PUSH_USING)) | |
a5e6b29b GDR |
2145 | { |
2146 | if (old && TREE_CODE (old) != OVERLOAD) | |
2147 | new_binding = ovl_cons (decl, ovl_cons (old, NULL_TREE)); | |
2148 | else | |
2149 | new_binding = ovl_cons (decl, old); | |
2150 | if (flags & PUSH_USING) | |
2151 | OVL_USED (new_binding) = 1; | |
2152 | } | |
2153 | else | |
3c28fc74 | 2154 | /* NAME is not ambiguous. */ |
a5e6b29b GDR |
2155 | new_binding = decl; |
2156 | ||
2157 | if (doing_global) | |
2158 | set_namespace_binding (name, current_namespace, new_binding); | |
2159 | else | |
2160 | { | |
2161 | /* We only create an OVERLOAD if there was a previous binding at | |
2162 | this level, or if decl is a template. In the former case, we | |
2163 | need to remove the old binding and replace it with the new | |
2164 | binding. We must also run through the NAMES on the binding | |
2165 | level where the name was bound to update the chain. */ | |
2166 | ||
2167 | if (TREE_CODE (new_binding) == OVERLOAD && old) | |
2168 | { | |
2169 | tree *d; | |
2170 | ||
2171 | for (d = &IDENTIFIER_BINDING (name)->scope->names; | |
2172 | *d; | |
c043ee4a | 2173 | d = &TREE_CHAIN (*d)) |
a5e6b29b GDR |
2174 | if (*d == old |
2175 | || (TREE_CODE (*d) == TREE_LIST | |
2176 | && TREE_VALUE (*d) == old)) | |
2177 | { | |
2178 | if (TREE_CODE (*d) == TREE_LIST) | |
2179 | /* Just replace the old binding with the new. */ | |
2180 | TREE_VALUE (*d) = new_binding; | |
2181 | else | |
2182 | /* Build a TREE_LIST to wrap the OVERLOAD. */ | |
2183 | *d = tree_cons (NULL_TREE, new_binding, | |
c043ee4a | 2184 | TREE_CHAIN (*d)); |
a5e6b29b GDR |
2185 | |
2186 | /* And update the cxx_binding node. */ | |
2187 | IDENTIFIER_BINDING (name)->value = new_binding; | |
2188 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
2189 | } | |
2190 | ||
2191 | /* We should always find a previous binding in this case. */ | |
315fb5db | 2192 | gcc_unreachable (); |
a5e6b29b GDR |
2193 | } |
2194 | ||
2195 | /* Install the new binding. */ | |
2196 | push_local_binding (name, new_binding, flags); | |
2197 | } | |
2198 | ||
2199 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
2200 | } | |
2201 | ||
5a167978 GDR |
2202 | /* Check a non-member using-declaration. Return the name and scope |
2203 | being used, and the USING_DECL, or NULL_TREE on failure. */ | |
2204 | ||
2205 | static tree | |
ed5f054f | 2206 | validate_nonmember_using_decl (tree decl, tree scope, tree name) |
5a167978 | 2207 | { |
7756db03 MM |
2208 | /* [namespace.udecl] |
2209 | A using-declaration for a class member shall be a | |
2210 | member-declaration. */ | |
2211 | if (TYPE_P (scope)) | |
2212 | { | |
2a13a625 | 2213 | error ("%qT is not a namespace", scope); |
7756db03 MM |
2214 | return NULL_TREE; |
2215 | } | |
2216 | else if (scope == error_mark_node) | |
2217 | return NULL_TREE; | |
2218 | ||
5a167978 GDR |
2219 | if (TREE_CODE (decl) == TEMPLATE_ID_EXPR) |
2220 | { | |
5a167978 GDR |
2221 | /* 7.3.3/5 |
2222 | A using-declaration shall not name a template-id. */ | |
2a13a625 | 2223 | error ("a using-declaration cannot specify a template-id. " |
0cbd7506 | 2224 | "Try %<using %D%>", name); |
5a167978 GDR |
2225 | return NULL_TREE; |
2226 | } | |
2227 | ||
2228 | if (TREE_CODE (decl) == NAMESPACE_DECL) | |
2229 | { | |
2a13a625 | 2230 | error ("namespace %qD not allowed in using-declaration", decl); |
5a167978 GDR |
2231 | return NULL_TREE; |
2232 | } | |
2233 | ||
2234 | if (TREE_CODE (decl) == SCOPE_REF) | |
2235 | { | |
2236 | /* It's a nested name with template parameter dependent scope. | |
2237 | This can only be using-declaration for class member. */ | |
2a13a625 | 2238 | error ("%qT is not a namespace", TREE_OPERAND (decl, 0)); |
5a167978 GDR |
2239 | return NULL_TREE; |
2240 | } | |
2241 | ||
2242 | if (is_overloaded_fn (decl)) | |
2243 | decl = get_first_fn (decl); | |
2244 | ||
50bc768d | 2245 | gcc_assert (DECL_P (decl)); |
5a167978 | 2246 | |
5a167978 | 2247 | /* Make a USING_DECL. */ |
ed5f054f | 2248 | return push_using_decl (scope, name); |
5a167978 GDR |
2249 | } |
2250 | ||
2251 | /* Process local and global using-declarations. */ | |
2252 | ||
2253 | static void | |
2254 | do_nonmember_using_decl (tree scope, tree name, tree oldval, tree oldtype, | |
0cbd7506 | 2255 | tree *newval, tree *newtype) |
5a167978 | 2256 | { |
15f8ac7f | 2257 | struct scope_binding decls = EMPTY_SCOPE_BINDING; |
5a167978 GDR |
2258 | |
2259 | *newval = *newtype = NULL_TREE; | |
5a167978 GDR |
2260 | if (!qualified_lookup_using_namespace (name, scope, &decls, 0)) |
2261 | /* Lookup error */ | |
2262 | return; | |
2263 | ||
2264 | if (!decls.value && !decls.type) | |
2265 | { | |
2a13a625 | 2266 | error ("%qD not declared", name); |
5a167978 GDR |
2267 | return; |
2268 | } | |
2269 | ||
44fd0e80 OW |
2270 | /* Shift the old and new bindings around so we're comparing class and |
2271 | enumeration names to each other. */ | |
2272 | if (oldval && DECL_IMPLICIT_TYPEDEF_P (oldval)) | |
2273 | { | |
2274 | oldtype = oldval; | |
2275 | oldval = NULL_TREE; | |
2276 | } | |
2277 | ||
2278 | if (decls.value && DECL_IMPLICIT_TYPEDEF_P (decls.value)) | |
2279 | { | |
2280 | decls.type = decls.value; | |
2281 | decls.value = NULL_TREE; | |
2282 | } | |
2283 | ||
d035c296 MM |
2284 | /* It is impossible to overload a built-in function; any explicit |
2285 | declaration eliminates the built-in declaration. So, if OLDVAL | |
2286 | is a built-in, then we can just pretend it isn't there. */ | |
c8094d83 | 2287 | if (oldval |
d035c296 | 2288 | && TREE_CODE (oldval) == FUNCTION_DECL |
d63d5d0c ILT |
2289 | && DECL_ANTICIPATED (oldval) |
2290 | && !DECL_HIDDEN_FRIEND_P (oldval)) | |
d035c296 MM |
2291 | oldval = NULL_TREE; |
2292 | ||
44fd0e80 | 2293 | if (decls.value) |
5a167978 | 2294 | { |
44fd0e80 OW |
2295 | /* Check for using functions. */ |
2296 | if (is_overloaded_fn (decls.value)) | |
5a167978 | 2297 | { |
44fd0e80 | 2298 | tree tmp, tmp1; |
5a167978 | 2299 | |
44fd0e80 OW |
2300 | if (oldval && !is_overloaded_fn (oldval)) |
2301 | { | |
2302 | error ("%qD is already declared in this scope", name); | |
2303 | oldval = NULL_TREE; | |
2304 | } | |
5a167978 | 2305 | |
44fd0e80 OW |
2306 | *newval = oldval; |
2307 | for (tmp = decls.value; tmp; tmp = OVL_NEXT (tmp)) | |
5a167978 | 2308 | { |
44fd0e80 OW |
2309 | tree new_fn = OVL_CURRENT (tmp); |
2310 | ||
2311 | /* [namespace.udecl] | |
2312 | ||
2313 | If a function declaration in namespace scope or block | |
2314 | scope has the same name and the same parameter types as a | |
2315 | function introduced by a using declaration the program is | |
2316 | ill-formed. */ | |
2317 | for (tmp1 = oldval; tmp1; tmp1 = OVL_NEXT (tmp1)) | |
5a167978 | 2318 | { |
44fd0e80 | 2319 | tree old_fn = OVL_CURRENT (tmp1); |
e3016344 | 2320 | |
44fd0e80 OW |
2321 | if (new_fn == old_fn) |
2322 | /* The function already exists in the current namespace. */ | |
e3016344 | 2323 | break; |
44fd0e80 OW |
2324 | else if (OVL_USED (tmp1)) |
2325 | continue; /* this is a using decl */ | |
2326 | else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (new_fn)), | |
2327 | TYPE_ARG_TYPES (TREE_TYPE (old_fn)))) | |
0cbd7506 | 2328 | { |
44fd0e80 OW |
2329 | gcc_assert (!DECL_ANTICIPATED (old_fn) |
2330 | || DECL_HIDDEN_FRIEND_P (old_fn)); | |
2331 | ||
2332 | /* There was already a non-using declaration in | |
2333 | this scope with the same parameter types. If both | |
2334 | are the same extern "C" functions, that's ok. */ | |
2335 | if (decls_match (new_fn, old_fn)) | |
2336 | break; | |
2337 | else | |
2338 | { | |
2339 | error ("%qD is already declared in this scope", name); | |
2340 | break; | |
2341 | } | |
5a167978 | 2342 | } |
5a167978 | 2343 | } |
5a167978 | 2344 | |
44fd0e80 OW |
2345 | /* If we broke out of the loop, there's no reason to add |
2346 | this function to the using declarations for this | |
2347 | scope. */ | |
2348 | if (tmp1) | |
2349 | continue; | |
2350 | ||
2351 | /* If we are adding to an existing OVERLOAD, then we no | |
2352 | longer know the type of the set of functions. */ | |
2353 | if (*newval && TREE_CODE (*newval) == OVERLOAD) | |
2354 | TREE_TYPE (*newval) = unknown_type_node; | |
2355 | /* Add this new function to the set. */ | |
2356 | *newval = build_overload (OVL_CURRENT (tmp), *newval); | |
2357 | /* If there is only one function, then we use its type. (A | |
2358 | using-declaration naming a single function can be used in | |
2359 | contexts where overload resolution cannot be | |
2360 | performed.) */ | |
2361 | if (TREE_CODE (*newval) != OVERLOAD) | |
2362 | { | |
2363 | *newval = ovl_cons (*newval, NULL_TREE); | |
2364 | TREE_TYPE (*newval) = TREE_TYPE (OVL_CURRENT (tmp)); | |
2365 | } | |
2366 | OVL_USED (*newval) = 1; | |
26bcf8fc | 2367 | } |
44fd0e80 OW |
2368 | } |
2369 | else | |
2370 | { | |
2371 | *newval = decls.value; | |
2372 | if (oldval && !decls_match (*newval, oldval)) | |
2373 | error ("%qD is already declared in this scope", name); | |
5a167978 GDR |
2374 | } |
2375 | } | |
c8094d83 | 2376 | else |
44fd0e80 | 2377 | *newval = oldval; |
5a167978 | 2378 | |
19831e2b | 2379 | if (decls.type && TREE_CODE (decls.type) == TREE_LIST) |
5a167978 | 2380 | { |
19831e2b OW |
2381 | error ("reference to %qD is ambiguous", name); |
2382 | print_candidates (decls.type); | |
2383 | } | |
2384 | else | |
2385 | { | |
2386 | *newtype = decls.type; | |
44fd0e80 OW |
2387 | if (oldtype && *newtype && !decls_match (oldtype, *newtype)) |
2388 | error ("%qD is already declared in this scope", name); | |
5a167978 | 2389 | } |
44fd0e80 OW |
2390 | |
2391 | /* If *newval is empty, shift any class or enumeration name down. */ | |
2392 | if (!*newval) | |
2393 | { | |
2394 | *newval = *newtype; | |
2395 | *newtype = NULL_TREE; | |
2396 | } | |
5a167978 GDR |
2397 | } |
2398 | ||
2399 | /* Process a using-declaration at function scope. */ | |
2400 | ||
2401 | void | |
ed5f054f | 2402 | do_local_using_decl (tree decl, tree scope, tree name) |
5a167978 | 2403 | { |
5a167978 | 2404 | tree oldval, oldtype, newval, newtype; |
6097b0c3 | 2405 | tree orig_decl = decl; |
5a167978 | 2406 | |
ed5f054f | 2407 | decl = validate_nonmember_using_decl (decl, scope, name); |
5a167978 GDR |
2408 | if (decl == NULL_TREE) |
2409 | return; | |
2410 | ||
2411 | if (building_stmt_tree () | |
2412 | && at_function_scope_p ()) | |
350fae66 | 2413 | add_decl_expr (decl); |
5a167978 | 2414 | |
461c6fce | 2415 | oldval = lookup_name_innermost_nonclass_level (name); |
5a167978 GDR |
2416 | oldtype = lookup_type_current_level (name); |
2417 | ||
2418 | do_nonmember_using_decl (scope, name, oldval, oldtype, &newval, &newtype); | |
2419 | ||
2420 | if (newval) | |
2421 | { | |
2422 | if (is_overloaded_fn (newval)) | |
2423 | { | |
2424 | tree fn, term; | |
2425 | ||
2426 | /* We only need to push declarations for those functions | |
2427 | that were not already bound in the current level. | |
2428 | The old value might be NULL_TREE, it might be a single | |
2429 | function, or an OVERLOAD. */ | |
2430 | if (oldval && TREE_CODE (oldval) == OVERLOAD) | |
2431 | term = OVL_FUNCTION (oldval); | |
2432 | else | |
2433 | term = oldval; | |
c8094d83 | 2434 | for (fn = newval; fn && OVL_CURRENT (fn) != term; |
5a167978 | 2435 | fn = OVL_NEXT (fn)) |
c8094d83 | 2436 | push_overloaded_decl (OVL_CURRENT (fn), |
d63d5d0c ILT |
2437 | PUSH_LOCAL | PUSH_USING, |
2438 | false); | |
5a167978 GDR |
2439 | } |
2440 | else | |
2441 | push_local_binding (name, newval, PUSH_USING); | |
2442 | } | |
2443 | if (newtype) | |
4546865e MM |
2444 | { |
2445 | push_local_binding (name, newtype, PUSH_USING); | |
2446 | set_identifier_type_value (name, newtype); | |
2447 | } | |
6097b0c3 DP |
2448 | |
2449 | /* Emit debug info. */ | |
2450 | if (!processing_template_decl) | |
2451 | cp_emit_debug_info_for_using (orig_decl, current_scope()); | |
5a167978 GDR |
2452 | } |
2453 | ||
5a167978 GDR |
2454 | /* Returns true if ROOT (a namespace, class, or function) encloses |
2455 | CHILD. CHILD may be either a class type or a namespace. */ | |
2456 | ||
2457 | bool | |
2458 | is_ancestor (tree root, tree child) | |
2459 | { | |
50bc768d NS |
2460 | gcc_assert ((TREE_CODE (root) == NAMESPACE_DECL |
2461 | || TREE_CODE (root) == FUNCTION_DECL | |
2462 | || CLASS_TYPE_P (root))); | |
2463 | gcc_assert ((TREE_CODE (child) == NAMESPACE_DECL | |
2464 | || CLASS_TYPE_P (child))); | |
c8094d83 | 2465 | |
5a167978 GDR |
2466 | /* The global namespace encloses everything. */ |
2467 | if (root == global_namespace) | |
2468 | return true; | |
2469 | ||
2470 | while (true) | |
2471 | { | |
2472 | /* If we've run out of scopes, stop. */ | |
2473 | if (!child) | |
2474 | return false; | |
2475 | /* If we've reached the ROOT, it encloses CHILD. */ | |
2476 | if (root == child) | |
2477 | return true; | |
2478 | /* Go out one level. */ | |
2479 | if (TYPE_P (child)) | |
2480 | child = TYPE_NAME (child); | |
2481 | child = DECL_CONTEXT (child); | |
2482 | } | |
2483 | } | |
2484 | ||
4514aa8c NS |
2485 | /* Enter the class or namespace scope indicated by T suitable for name |
2486 | lookup. T can be arbitrary scope, not necessary nested inside the | |
2487 | current scope. Returns a non-null scope to pop iff pop_scope | |
2488 | should be called later to exit this scope. */ | |
5a167978 | 2489 | |
4514aa8c | 2490 | tree |
5a167978 GDR |
2491 | push_scope (tree t) |
2492 | { | |
2493 | if (TREE_CODE (t) == NAMESPACE_DECL) | |
2494 | push_decl_namespace (t); | |
91b004e5 MM |
2495 | else if (CLASS_TYPE_P (t)) |
2496 | { | |
2497 | if (!at_class_scope_p () | |
2498 | || !same_type_p (current_class_type, t)) | |
2499 | push_nested_class (t); | |
2500 | else | |
2501 | /* T is the same as the current scope. There is therefore no | |
2502 | need to re-enter the scope. Since we are not actually | |
2503 | pushing a new scope, our caller should not call | |
2504 | pop_scope. */ | |
4514aa8c | 2505 | t = NULL_TREE; |
91b004e5 MM |
2506 | } |
2507 | ||
4514aa8c | 2508 | return t; |
5a167978 GDR |
2509 | } |
2510 | ||
2511 | /* Leave scope pushed by push_scope. */ | |
2512 | ||
2513 | void | |
2514 | pop_scope (tree t) | |
2515 | { | |
46408846 JM |
2516 | if (t == NULL_TREE) |
2517 | return; | |
5a167978 GDR |
2518 | if (TREE_CODE (t) == NAMESPACE_DECL) |
2519 | pop_decl_namespace (); | |
2520 | else if CLASS_TYPE_P (t) | |
2521 | pop_nested_class (); | |
2522 | } | |
87c465f5 KL |
2523 | |
2524 | /* Subroutine of push_inner_scope. */ | |
2525 | ||
2526 | static void | |
2527 | push_inner_scope_r (tree outer, tree inner) | |
2528 | { | |
2529 | tree prev; | |
2530 | ||
2531 | if (outer == inner | |
2532 | || (TREE_CODE (inner) != NAMESPACE_DECL && !CLASS_TYPE_P (inner))) | |
2533 | return; | |
2534 | ||
2535 | prev = CP_DECL_CONTEXT (TREE_CODE (inner) == NAMESPACE_DECL ? inner : TYPE_NAME (inner)); | |
2536 | if (outer != prev) | |
2537 | push_inner_scope_r (outer, prev); | |
2538 | if (TREE_CODE (inner) == NAMESPACE_DECL) | |
2539 | { | |
2540 | struct cp_binding_level *save_template_parm = 0; | |
2541 | /* Temporary take out template parameter scopes. They are saved | |
2542 | in reversed order in save_template_parm. */ | |
2543 | while (current_binding_level->kind == sk_template_parms) | |
2544 | { | |
2545 | struct cp_binding_level *b = current_binding_level; | |
2546 | current_binding_level = b->level_chain; | |
2547 | b->level_chain = save_template_parm; | |
2548 | save_template_parm = b; | |
2549 | } | |
2550 | ||
2551 | resume_scope (NAMESPACE_LEVEL (inner)); | |
2552 | current_namespace = inner; | |
2553 | ||
2554 | /* Restore template parameter scopes. */ | |
2555 | while (save_template_parm) | |
2556 | { | |
2557 | struct cp_binding_level *b = save_template_parm; | |
2558 | save_template_parm = b->level_chain; | |
2559 | b->level_chain = current_binding_level; | |
2560 | current_binding_level = b; | |
2561 | } | |
2562 | } | |
2563 | else | |
2564 | pushclass (inner); | |
2565 | } | |
2566 | ||
2567 | /* Enter the scope INNER from current scope. INNER must be a scope | |
2568 | nested inside current scope. This works with both name lookup and | |
2569 | pushing name into scope. In case a template parameter scope is present, | |
2570 | namespace is pushed under the template parameter scope according to | |
2571 | name lookup rule in 14.6.1/6. | |
c8094d83 | 2572 | |
87c465f5 KL |
2573 | Return the former current scope suitable for pop_inner_scope. */ |
2574 | ||
2575 | tree | |
2576 | push_inner_scope (tree inner) | |
2577 | { | |
2578 | tree outer = current_scope (); | |
2579 | if (!outer) | |
2580 | outer = current_namespace; | |
2581 | ||
2582 | push_inner_scope_r (outer, inner); | |
2583 | return outer; | |
2584 | } | |
2585 | ||
2586 | /* Exit the current scope INNER back to scope OUTER. */ | |
2587 | ||
2588 | void | |
2589 | pop_inner_scope (tree outer, tree inner) | |
2590 | { | |
2591 | if (outer == inner | |
2592 | || (TREE_CODE (inner) != NAMESPACE_DECL && !CLASS_TYPE_P (inner))) | |
2593 | return; | |
2594 | ||
2595 | while (outer != inner) | |
2596 | { | |
2597 | if (TREE_CODE (inner) == NAMESPACE_DECL) | |
2598 | { | |
2599 | struct cp_binding_level *save_template_parm = 0; | |
2600 | /* Temporary take out template parameter scopes. They are saved | |
2601 | in reversed order in save_template_parm. */ | |
2602 | while (current_binding_level->kind == sk_template_parms) | |
2603 | { | |
2604 | struct cp_binding_level *b = current_binding_level; | |
2605 | current_binding_level = b->level_chain; | |
2606 | b->level_chain = save_template_parm; | |
2607 | save_template_parm = b; | |
2608 | } | |
2609 | ||
2610 | pop_namespace (); | |
2611 | ||
2612 | /* Restore template parameter scopes. */ | |
2613 | while (save_template_parm) | |
2614 | { | |
2615 | struct cp_binding_level *b = save_template_parm; | |
2616 | save_template_parm = b->level_chain; | |
2617 | b->level_chain = current_binding_level; | |
2618 | current_binding_level = b; | |
2619 | } | |
2620 | } | |
2621 | else | |
2622 | popclass (); | |
2623 | ||
2624 | inner = CP_DECL_CONTEXT (TREE_CODE (inner) == NAMESPACE_DECL ? inner : TYPE_NAME (inner)); | |
2625 | } | |
2626 | } | |
00e8de68 GDR |
2627 | \f |
2628 | /* Do a pushlevel for class declarations. */ | |
2629 | ||
2630 | void | |
2631 | pushlevel_class (void) | |
2632 | { | |
00e8de68 GDR |
2633 | class_binding_level = begin_scope (sk_class, current_class_type); |
2634 | } | |
2635 | ||
2636 | /* ...and a poplevel for class declarations. */ | |
2637 | ||
2638 | void | |
2639 | poplevel_class (void) | |
2640 | { | |
926ce8bd | 2641 | struct cp_binding_level *level = class_binding_level; |
89b578be MM |
2642 | cp_class_binding *cb; |
2643 | size_t i; | |
00e8de68 GDR |
2644 | tree shadowed; |
2645 | ||
2646 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d | 2647 | gcc_assert (level != 0); |
00e8de68 | 2648 | |
39fb05d0 MM |
2649 | /* If we're leaving a toplevel class, cache its binding level. */ |
2650 | if (current_class_depth == 1) | |
89b578be | 2651 | previous_class_level = level; |
00e8de68 GDR |
2652 | for (shadowed = level->type_shadowed; |
2653 | shadowed; | |
2654 | shadowed = TREE_CHAIN (shadowed)) | |
2655 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (shadowed), TREE_VALUE (shadowed)); | |
2656 | ||
2657 | /* Remove the bindings for all of the class-level declarations. */ | |
90ea9897 MM |
2658 | if (level->class_shadowed) |
2659 | { | |
ac47786e | 2660 | FOR_EACH_VEC_ELT (cp_class_binding, level->class_shadowed, i, cb) |
90ea9897 MM |
2661 | IDENTIFIER_BINDING (cb->identifier) = cb->base.previous; |
2662 | ggc_free (level->class_shadowed); | |
2663 | level->class_shadowed = NULL; | |
2664 | } | |
00e8de68 GDR |
2665 | |
2666 | /* Now, pop out of the binding level which we created up in the | |
2667 | `pushlevel_class' routine. */ | |
f33ab5c3 | 2668 | gcc_assert (current_binding_level == level); |
00e8de68 GDR |
2669 | leave_scope (); |
2670 | timevar_pop (TV_NAME_LOOKUP); | |
2671 | } | |
2672 | ||
90ea9897 MM |
2673 | /* Set INHERITED_VALUE_BINDING_P on BINDING to true or false, as |
2674 | appropriate. DECL is the value to which a name has just been | |
df05a794 | 2675 | bound. CLASS_TYPE is the class in which the lookup occurred. */ |
00e8de68 | 2676 | |
90ea9897 | 2677 | static void |
df05a794 MM |
2678 | set_inherited_value_binding_p (cxx_binding *binding, tree decl, |
2679 | tree class_type) | |
00e8de68 | 2680 | { |
00e8de68 GDR |
2681 | if (binding->value == decl && TREE_CODE (decl) != TREE_LIST) |
2682 | { | |
90ea9897 MM |
2683 | tree context; |
2684 | ||
00e8de68 GDR |
2685 | if (TREE_CODE (decl) == OVERLOAD) |
2686 | context = CP_DECL_CONTEXT (OVL_CURRENT (decl)); | |
2687 | else | |
2688 | { | |
50bc768d | 2689 | gcc_assert (DECL_P (decl)); |
00e8de68 GDR |
2690 | context = context_for_name_lookup (decl); |
2691 | } | |
2692 | ||
df05a794 | 2693 | if (is_properly_derived_from (class_type, context)) |
00e8de68 GDR |
2694 | INHERITED_VALUE_BINDING_P (binding) = 1; |
2695 | else | |
2696 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
2697 | } | |
2698 | else if (binding->value == decl) | |
90ea9897 MM |
2699 | /* We only encounter a TREE_LIST when there is an ambiguity in the |
2700 | base classes. Such an ambiguity can be overridden by a | |
2701 | definition in this class. */ | |
00e8de68 | 2702 | INHERITED_VALUE_BINDING_P (binding) = 1; |
90ea9897 MM |
2703 | else |
2704 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
00e8de68 GDR |
2705 | } |
2706 | ||
00e8de68 GDR |
2707 | /* Make the declaration of X appear in CLASS scope. */ |
2708 | ||
2709 | bool | |
2710 | pushdecl_class_level (tree x) | |
2711 | { | |
2712 | tree name; | |
2713 | bool is_valid = true; | |
2714 | ||
d5f4eddd JM |
2715 | /* Do nothing if we're adding to an outer lambda closure type, |
2716 | outer_binding will add it later if it's needed. */ | |
2717 | if (current_class_type != class_binding_level->this_entity) | |
2718 | return true; | |
2719 | ||
00e8de68 GDR |
2720 | timevar_push (TV_NAME_LOOKUP); |
2721 | /* Get the name of X. */ | |
2722 | if (TREE_CODE (x) == OVERLOAD) | |
2723 | name = DECL_NAME (get_first_fn (x)); | |
2724 | else | |
2725 | name = DECL_NAME (x); | |
2726 | ||
2727 | if (name) | |
2728 | { | |
2729 | is_valid = push_class_level_binding (name, x); | |
2730 | if (TREE_CODE (x) == TYPE_DECL) | |
2731 | set_identifier_type_value (name, x); | |
2732 | } | |
2733 | else if (ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2734 | { | |
2735 | /* If X is an anonymous aggregate, all of its members are | |
2736 | treated as if they were members of the class containing the | |
2737 | aggregate, for naming purposes. */ | |
2738 | tree f; | |
2739 | ||
910ad8de | 2740 | for (f = TYPE_FIELDS (TREE_TYPE (x)); f; f = DECL_CHAIN (f)) |
00e8de68 GDR |
2741 | { |
2742 | location_t save_location = input_location; | |
2743 | input_location = DECL_SOURCE_LOCATION (f); | |
2744 | if (!pushdecl_class_level (f)) | |
2745 | is_valid = false; | |
2746 | input_location = save_location; | |
2747 | } | |
2748 | } | |
be99edf8 | 2749 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, is_valid); |
00e8de68 GDR |
2750 | } |
2751 | ||
90ea9897 MM |
2752 | /* Return the BINDING (if any) for NAME in SCOPE, which is a class |
2753 | scope. If the value returned is non-NULL, and the PREVIOUS field | |
2754 | is not set, callers must set the PREVIOUS field explicitly. */ | |
2755 | ||
2756 | static cxx_binding * | |
2757 | get_class_binding (tree name, cxx_scope *scope) | |
2758 | { | |
2759 | tree class_type; | |
2760 | tree type_binding; | |
2761 | tree value_binding; | |
2762 | cxx_binding *binding; | |
2763 | ||
2764 | class_type = scope->this_entity; | |
2765 | ||
2766 | /* Get the type binding. */ | |
2767 | type_binding = lookup_member (class_type, name, | |
2768 | /*protect=*/2, /*want_type=*/true); | |
2769 | /* Get the value binding. */ | |
2770 | value_binding = lookup_member (class_type, name, | |
2771 | /*protect=*/2, /*want_type=*/false); | |
2772 | ||
2773 | if (value_binding | |
2774 | && (TREE_CODE (value_binding) == TYPE_DECL | |
2775 | || DECL_CLASS_TEMPLATE_P (value_binding) | |
2776 | || (TREE_CODE (value_binding) == TREE_LIST | |
2777 | && TREE_TYPE (value_binding) == error_mark_node | |
2778 | && (TREE_CODE (TREE_VALUE (value_binding)) | |
2779 | == TYPE_DECL)))) | |
2780 | /* We found a type binding, even when looking for a non-type | |
2781 | binding. This means that we already processed this binding | |
2782 | above. */ | |
2783 | ; | |
2784 | else if (value_binding) | |
2785 | { | |
c8094d83 | 2786 | if (TREE_CODE (value_binding) == TREE_LIST |
90ea9897 MM |
2787 | && TREE_TYPE (value_binding) == error_mark_node) |
2788 | /* NAME is ambiguous. */ | |
2789 | ; | |
2790 | else if (BASELINK_P (value_binding)) | |
2791 | /* NAME is some overloaded functions. */ | |
2792 | value_binding = BASELINK_FUNCTIONS (value_binding); | |
2793 | } | |
2794 | ||
2795 | /* If we found either a type binding or a value binding, create a | |
2796 | new binding object. */ | |
2797 | if (type_binding || value_binding) | |
2798 | { | |
c8094d83 MS |
2799 | binding = new_class_binding (name, |
2800 | value_binding, | |
90ea9897 MM |
2801 | type_binding, |
2802 | scope); | |
2803 | /* This is a class-scope binding, not a block-scope binding. */ | |
2804 | LOCAL_BINDING_P (binding) = 0; | |
df05a794 | 2805 | set_inherited_value_binding_p (binding, value_binding, class_type); |
90ea9897 MM |
2806 | } |
2807 | else | |
2808 | binding = NULL; | |
2809 | ||
2810 | return binding; | |
2811 | } | |
c8094d83 | 2812 | |
00e8de68 GDR |
2813 | /* Make the declaration(s) of X appear in CLASS scope under the name |
2814 | NAME. Returns true if the binding is valid. */ | |
2815 | ||
2816 | bool | |
2817 | push_class_level_binding (tree name, tree x) | |
2818 | { | |
2819 | cxx_binding *binding; | |
90ea9897 MM |
2820 | tree decl = x; |
2821 | bool ok; | |
00e8de68 GDR |
2822 | |
2823 | timevar_push (TV_NAME_LOOKUP); | |
2824 | /* The class_binding_level will be NULL if x is a template | |
2825 | parameter name in a member template. */ | |
2826 | if (!class_binding_level) | |
2827 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
2828 | ||
0fdc23b9 LM |
2829 | if (name == error_mark_node) |
2830 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
2831 | ||
90ea9897 | 2832 | /* Check for invalid member names. */ |
50bc768d | 2833 | gcc_assert (TYPE_BEING_DEFINED (current_class_type)); |
c67a1c46 JM |
2834 | /* Check that we're pushing into the right binding level. */ |
2835 | gcc_assert (current_class_type == class_binding_level->this_entity); | |
2836 | ||
90ea9897 MM |
2837 | /* We could have been passed a tree list if this is an ambiguous |
2838 | declaration. If so, pull the declaration out because | |
03fd3f84 | 2839 | check_template_shadow will not handle a TREE_LIST. */ |
c8094d83 | 2840 | if (TREE_CODE (decl) == TREE_LIST |
90ea9897 MM |
2841 | && TREE_TYPE (decl) == error_mark_node) |
2842 | decl = TREE_VALUE (decl); | |
ece95d90 | 2843 | |
157b0647 PC |
2844 | if (!check_template_shadow (decl)) |
2845 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
00e8de68 | 2846 | |
90ea9897 | 2847 | /* [class.mem] |
d2f2c87b | 2848 | |
90ea9897 MM |
2849 | If T is the name of a class, then each of the following shall |
2850 | have a name different from T: | |
d2f2c87b | 2851 | |
90ea9897 | 2852 | -- every static data member of class T; |
d2f2c87b | 2853 | |
90ea9897 | 2854 | -- every member of class T that is itself a type; |
d2f2c87b | 2855 | |
90ea9897 MM |
2856 | -- every enumerator of every member of class T that is an |
2857 | enumerated type; | |
d2f2c87b | 2858 | |
90ea9897 MM |
2859 | -- every member of every anonymous union that is a member of |
2860 | class T. | |
d2f2c87b | 2861 | |
90ea9897 MM |
2862 | (Non-static data members were also forbidden to have the same |
2863 | name as T until TC1.) */ | |
2864 | if ((TREE_CODE (x) == VAR_DECL | |
2865 | || TREE_CODE (x) == CONST_DECL | |
2866 | || (TREE_CODE (x) == TYPE_DECL | |
2867 | && !DECL_SELF_REFERENCE_P (x)) | |
2868 | /* A data member of an anonymous union. */ | |
2869 | || (TREE_CODE (x) == FIELD_DECL | |
2870 | && DECL_CONTEXT (x) != current_class_type)) | |
2871 | && DECL_NAME (x) == constructor_name (current_class_type)) | |
2872 | { | |
2873 | tree scope = context_for_name_lookup (x); | |
2874 | if (TYPE_P (scope) && same_type_p (scope, current_class_type)) | |
a6567a0f | 2875 | { |
2a13a625 | 2876 | error ("%qD has the same name as the class in which it is " |
90ea9897 MM |
2877 | "declared", |
2878 | x); | |
2879 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
a6567a0f | 2880 | } |
d2f2c87b MM |
2881 | } |
2882 | ||
90ea9897 | 2883 | /* Get the current binding for NAME in this class, if any. */ |
00e8de68 | 2884 | binding = IDENTIFIER_BINDING (name); |
90ea9897 MM |
2885 | if (!binding || binding->scope != class_binding_level) |
2886 | { | |
2887 | binding = get_class_binding (name, class_binding_level); | |
2888 | /* If a new binding was created, put it at the front of the | |
2889 | IDENTIFIER_BINDING list. */ | |
2890 | if (binding) | |
2891 | { | |
2892 | binding->previous = IDENTIFIER_BINDING (name); | |
2893 | IDENTIFIER_BINDING (name) = binding; | |
2894 | } | |
2895 | } | |
2896 | ||
2897 | /* If there is already a binding, then we may need to update the | |
2898 | current value. */ | |
00e8de68 GDR |
2899 | if (binding && binding->value) |
2900 | { | |
2901 | tree bval = binding->value; | |
2902 | tree old_decl = NULL_TREE; | |
2903 | ||
2904 | if (INHERITED_VALUE_BINDING_P (binding)) | |
2905 | { | |
2906 | /* If the old binding was from a base class, and was for a | |
0cbd7506 MS |
2907 | tag name, slide it over to make room for the new binding. |
2908 | The old binding is still visible if explicitly qualified | |
2909 | with a class-key. */ | |
00e8de68 GDR |
2910 | if (TREE_CODE (bval) == TYPE_DECL && DECL_ARTIFICIAL (bval) |
2911 | && !(TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x))) | |
2912 | { | |
2913 | old_decl = binding->type; | |
2914 | binding->type = bval; | |
2915 | binding->value = NULL_TREE; | |
2916 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
2917 | } | |
2918 | else | |
862e1e62 MM |
2919 | { |
2920 | old_decl = bval; | |
2921 | /* Any inherited type declaration is hidden by the type | |
2922 | declaration in the derived class. */ | |
2923 | if (TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x)) | |
2924 | binding->type = NULL_TREE; | |
2925 | } | |
00e8de68 GDR |
2926 | } |
2927 | else if (TREE_CODE (x) == OVERLOAD && is_overloaded_fn (bval)) | |
2928 | old_decl = bval; | |
2929 | else if (TREE_CODE (x) == USING_DECL && TREE_CODE (bval) == USING_DECL) | |
2930 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
2931 | else if (TREE_CODE (x) == USING_DECL && is_overloaded_fn (bval)) | |
2932 | old_decl = bval; | |
2933 | else if (TREE_CODE (bval) == USING_DECL && is_overloaded_fn (x)) | |
2934 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
89b578be | 2935 | |
90ea9897 | 2936 | if (old_decl && binding->scope == class_binding_level) |
00e8de68 | 2937 | { |
f31045fd MM |
2938 | binding->value = x; |
2939 | /* It is always safe to clear INHERITED_VALUE_BINDING_P | |
df05a794 MM |
2940 | here. This function is only used to register bindings |
2941 | from with the class definition itself. */ | |
f31045fd | 2942 | INHERITED_VALUE_BINDING_P (binding) = 0; |
f31045fd | 2943 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); |
00e8de68 GDR |
2944 | } |
2945 | } | |
2946 | ||
90ea9897 MM |
2947 | /* Note that we declared this value so that we can issue an error if |
2948 | this is an invalid redeclaration of a name already used for some | |
2949 | other purpose. */ | |
2950 | note_name_declared_in_class (name, decl); | |
2951 | ||
00e8de68 | 2952 | /* If we didn't replace an existing binding, put the binding on the |
90ea9897 MM |
2953 | stack of bindings for the identifier, and update the shadowed |
2954 | list. */ | |
2955 | if (binding && binding->scope == class_binding_level) | |
2956 | /* Supplement the existing binding. */ | |
2957 | ok = supplement_binding (binding, decl); | |
2958 | else | |
2959 | { | |
2960 | /* Create a new binding. */ | |
2961 | push_binding (name, decl, class_binding_level); | |
2962 | ok = true; | |
2963 | } | |
00e8de68 | 2964 | |
90ea9897 | 2965 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ok); |
00e8de68 GDR |
2966 | } |
2967 | ||
1d786913 MM |
2968 | /* Process "using SCOPE::NAME" in a class scope. Return the |
2969 | USING_DECL created. */ | |
2970 | ||
5a167978 | 2971 | tree |
1d786913 | 2972 | do_class_using_decl (tree scope, tree name) |
5a167978 | 2973 | { |
577b02d8 MM |
2974 | /* The USING_DECL returned by this function. */ |
2975 | tree value; | |
2976 | /* The declaration (or declarations) name by this using | |
2977 | declaration. NULL if we are in a template and cannot figure out | |
2978 | what has been named. */ | |
2979 | tree decl; | |
2980 | /* True if SCOPE is a dependent type. */ | |
2981 | bool scope_dependent_p; | |
2982 | /* True if SCOPE::NAME is dependent. */ | |
2983 | bool name_dependent_p; | |
2984 | /* True if any of the bases of CURRENT_CLASS_TYPE are dependent. */ | |
2985 | bool bases_dependent_p; | |
2986 | tree binfo; | |
2987 | tree base_binfo; | |
2988 | int i; | |
c8094d83 | 2989 | |
0fdc23b9 LM |
2990 | if (name == error_mark_node) |
2991 | return NULL_TREE; | |
2992 | ||
1d786913 | 2993 | if (!scope || !TYPE_P (scope)) |
5a167978 GDR |
2994 | { |
2995 | error ("using-declaration for non-member at class scope"); | |
2996 | return NULL_TREE; | |
2997 | } | |
98ed9dae | 2998 | |
98ed9dae | 2999 | /* Make sure the name is not invalid */ |
5a167978 GDR |
3000 | if (TREE_CODE (name) == BIT_NOT_EXPR) |
3001 | { | |
98ed9dae NS |
3002 | error ("%<%T::%D%> names destructor", scope, name); |
3003 | return NULL_TREE; | |
3004 | } | |
9e1e64ec | 3005 | if (MAYBE_CLASS_TYPE_P (scope) && constructor_name_p (name, scope)) |
98ed9dae NS |
3006 | { |
3007 | error ("%<%T::%D%> names constructor", scope, name); | |
3008 | return NULL_TREE; | |
3009 | } | |
3010 | if (constructor_name_p (name, current_class_type)) | |
3011 | { | |
3012 | error ("%<%T::%D%> names constructor in %qT", | |
3013 | scope, name, current_class_type); | |
5a167978 GDR |
3014 | return NULL_TREE; |
3015 | } | |
5a167978 | 3016 | |
577b02d8 | 3017 | scope_dependent_p = dependent_type_p (scope); |
3db45ab5 | 3018 | name_dependent_p = (scope_dependent_p |
82d6b018 | 3019 | || (IDENTIFIER_TYPENAME_P (name) |
577b02d8 | 3020 | && dependent_type_p (TREE_TYPE (name)))); |
6097b0c3 | 3021 | |
577b02d8 MM |
3022 | bases_dependent_p = false; |
3023 | if (processing_template_decl) | |
3024 | for (binfo = TYPE_BINFO (current_class_type), i = 0; | |
3db45ab5 | 3025 | BINFO_BASE_ITERATE (binfo, i, base_binfo); |
577b02d8 MM |
3026 | i++) |
3027 | if (dependent_type_p (TREE_TYPE (base_binfo))) | |
3028 | { | |
3029 | bases_dependent_p = true; | |
3030 | break; | |
3031 | } | |
3032 | ||
3033 | decl = NULL_TREE; | |
3034 | ||
3035 | /* From [namespace.udecl]: | |
c8094d83 | 3036 | |
577b02d8 | 3037 | A using-declaration used as a member-declaration shall refer to a |
3db45ab5 MS |
3038 | member of a base class of the class being defined. |
3039 | ||
577b02d8 MM |
3040 | In general, we cannot check this constraint in a template because |
3041 | we do not know the entire set of base classes of the current | |
3042 | class type. However, if all of the base classes are | |
3043 | non-dependent, then we can avoid delaying the check until | |
3044 | instantiation. */ | |
b01e6d2b | 3045 | if (!scope_dependent_p) |
577b02d8 MM |
3046 | { |
3047 | base_kind b_kind; | |
577b02d8 MM |
3048 | binfo = lookup_base (current_class_type, scope, ba_any, &b_kind); |
3049 | if (b_kind < bk_proper_base) | |
98ed9dae | 3050 | { |
b01e6d2b JM |
3051 | if (!bases_dependent_p) |
3052 | { | |
3053 | error_not_base_type (scope, current_class_type); | |
3054 | return NULL_TREE; | |
3055 | } | |
98ed9dae | 3056 | } |
b01e6d2b | 3057 | else if (!name_dependent_p) |
577b02d8 MM |
3058 | { |
3059 | decl = lookup_member (binfo, name, 0, false); | |
3060 | if (!decl) | |
3061 | { | |
3db45ab5 | 3062 | error ("no members matching %<%T::%D%> in %q#T", scope, name, |
577b02d8 MM |
3063 | scope); |
3064 | return NULL_TREE; | |
3065 | } | |
3066 | /* The binfo from which the functions came does not matter. */ | |
3067 | if (BASELINK_P (decl)) | |
3068 | decl = BASELINK_FUNCTIONS (decl); | |
3069 | } | |
98ed9dae | 3070 | } |
98ed9dae NS |
3071 | |
3072 | value = build_lang_decl (USING_DECL, name, NULL_TREE); | |
3073 | USING_DECL_DECLS (value) = decl; | |
3074 | USING_DECL_SCOPE (value) = scope; | |
577b02d8 | 3075 | DECL_DEPENDENT_P (value) = !decl; |
6097b0c3 | 3076 | |
5a167978 GDR |
3077 | return value; |
3078 | } | |
3079 | ||
00e8de68 GDR |
3080 | \f |
3081 | /* Return the binding value for name in scope. */ | |
3082 | ||
3083 | tree | |
3084 | namespace_binding (tree name, tree scope) | |
3085 | { | |
3086 | cxx_binding *binding; | |
3087 | ||
725214ac | 3088 | if (SCOPE_FILE_SCOPE_P (scope)) |
00e8de68 | 3089 | scope = global_namespace; |
8245c194 MA |
3090 | else |
3091 | /* Unnecessary for the global namespace because it can't be an alias. */ | |
3092 | scope = ORIGINAL_NAMESPACE (scope); | |
3093 | ||
00e8de68 GDR |
3094 | binding = cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); |
3095 | ||
3096 | return binding ? binding->value : NULL_TREE; | |
3097 | } | |
3098 | ||
3099 | /* Set the binding value for name in scope. */ | |
ed3cf953 GDR |
3100 | |
3101 | void | |
3102 | set_namespace_binding (tree name, tree scope, tree val) | |
3103 | { | |
3104 | cxx_binding *b; | |
3105 | ||
3106 | timevar_push (TV_NAME_LOOKUP); | |
3107 | if (scope == NULL_TREE) | |
3108 | scope = global_namespace; | |
3109 | b = binding_for_name (NAMESPACE_LEVEL (scope), name); | |
3c28fc74 | 3110 | if (!b->value || TREE_CODE (val) == OVERLOAD || val == error_mark_node) |
147135cc | 3111 | b->value = val; |
4b0d3cbe | 3112 | else |
c87ceb13 | 3113 | supplement_binding (b, val); |
ed3cf953 GDR |
3114 | timevar_pop (TV_NAME_LOOKUP); |
3115 | } | |
3116 | ||
5a167978 GDR |
3117 | /* Set the context of a declaration to scope. Complain if we are not |
3118 | outside scope. */ | |
3119 | ||
3120 | void | |
3121 | set_decl_namespace (tree decl, tree scope, bool friendp) | |
3122 | { | |
160594b0 | 3123 | tree old; |
c8094d83 | 3124 | |
5a167978 GDR |
3125 | /* Get rid of namespace aliases. */ |
3126 | scope = ORIGINAL_NAMESPACE (scope); | |
c8094d83 | 3127 | |
5a167978 GDR |
3128 | /* It is ok for friends to be qualified in parallel space. */ |
3129 | if (!friendp && !is_ancestor (current_namespace, scope)) | |
c4f73174 | 3130 | error ("declaration of %qD not in a namespace surrounding %qD", |
0cbd7506 | 3131 | decl, scope); |
5a167978 | 3132 | DECL_CONTEXT (decl) = FROB_CONTEXT (scope); |
5ae9ba3e | 3133 | |
c8094d83 MS |
3134 | /* Writing "int N::i" to declare a variable within "N" is invalid. */ |
3135 | if (scope == current_namespace) | |
5ae9ba3e MM |
3136 | { |
3137 | if (at_namespace_scope_p ()) | |
c85ce869 | 3138 | error ("explicit qualification in declaration of %qD", |
5ae9ba3e MM |
3139 | decl); |
3140 | return; | |
5a167978 | 3141 | } |
5ae9ba3e MM |
3142 | |
3143 | /* See whether this has been declared in the namespace. */ | |
664a90c0 | 3144 | old = lookup_qualified_name (scope, DECL_NAME (decl), false, true); |
97dc8e5b | 3145 | if (old == error_mark_node) |
5ae9ba3e MM |
3146 | /* No old declaration at all. */ |
3147 | goto complain; | |
160594b0 JM |
3148 | /* If it's a TREE_LIST, the result of the lookup was ambiguous. */ |
3149 | if (TREE_CODE (old) == TREE_LIST) | |
3150 | { | |
3151 | error ("reference to %qD is ambiguous", decl); | |
3152 | print_candidates (old); | |
3153 | return; | |
3154 | } | |
5ae9ba3e | 3155 | if (!is_overloaded_fn (decl)) |
160594b0 JM |
3156 | { |
3157 | /* We might have found OLD in an inline namespace inside SCOPE. */ | |
77278f4a JM |
3158 | if (TREE_CODE (decl) == TREE_CODE (old)) |
3159 | DECL_CONTEXT (decl) = DECL_CONTEXT (old); | |
160594b0 JM |
3160 | /* Don't compare non-function decls with decls_match here, since |
3161 | it can't check for the correct constness at this | |
3162 | point. pushdecl will find those errors later. */ | |
3163 | return; | |
3164 | } | |
5ae9ba3e MM |
3165 | /* Since decl is a function, old should contain a function decl. */ |
3166 | if (!is_overloaded_fn (old)) | |
3167 | goto complain; | |
664a90c0 JM |
3168 | /* A template can be explicitly specialized in any namespace. */ |
3169 | if (processing_explicit_instantiation) | |
3170 | return; | |
5ae9ba3e MM |
3171 | if (processing_template_decl || processing_specialization) |
3172 | /* We have not yet called push_template_decl to turn a | |
3173 | FUNCTION_DECL into a TEMPLATE_DECL, so the declarations won't | |
3174 | match. But, we'll check later, when we construct the | |
3175 | template. */ | |
5a167978 | 3176 | return; |
abc088aa MM |
3177 | /* Instantiations or specializations of templates may be declared as |
3178 | friends in any namespace. */ | |
3179 | if (friendp && DECL_USE_TEMPLATE (decl)) | |
3180 | return; | |
5ae9ba3e MM |
3181 | if (is_overloaded_fn (old)) |
3182 | { | |
160594b0 JM |
3183 | tree found = NULL_TREE; |
3184 | tree elt = old; | |
3185 | for (; elt; elt = OVL_NEXT (elt)) | |
3186 | { | |
3187 | tree ofn = OVL_CURRENT (elt); | |
3188 | /* Adjust DECL_CONTEXT first so decls_match will return true | |
3189 | if DECL will match a declaration in an inline namespace. */ | |
3190 | DECL_CONTEXT (decl) = DECL_CONTEXT (ofn); | |
3191 | if (decls_match (decl, ofn)) | |
3192 | { | |
3193 | if (found && !decls_match (found, ofn)) | |
3194 | { | |
3195 | DECL_CONTEXT (decl) = FROB_CONTEXT (scope); | |
3196 | error ("reference to %qD is ambiguous", decl); | |
3197 | print_candidates (old); | |
3198 | return; | |
3199 | } | |
3200 | found = ofn; | |
3201 | } | |
3202 | } | |
3203 | if (found) | |
3204 | { | |
3205 | if (!is_associated_namespace (scope, CP_DECL_CONTEXT (found))) | |
3206 | goto complain; | |
3207 | DECL_CONTEXT (decl) = DECL_CONTEXT (found); | |
5ae9ba3e | 3208 | return; |
160594b0 | 3209 | } |
5ae9ba3e | 3210 | } |
160594b0 JM |
3211 | else |
3212 | { | |
3213 | DECL_CONTEXT (decl) = DECL_CONTEXT (old); | |
3214 | if (decls_match (decl, old)) | |
3215 | return; | |
3216 | } | |
3217 | ||
3218 | /* It didn't work, go back to the explicit scope. */ | |
3219 | DECL_CONTEXT (decl) = FROB_CONTEXT (scope); | |
5a167978 | 3220 | complain: |
2a13a625 | 3221 | error ("%qD should have been declared inside %qD", decl, scope); |
c8094d83 | 3222 | } |
5a167978 GDR |
3223 | |
3224 | /* Return the namespace where the current declaration is declared. */ | |
3225 | ||
ae099258 | 3226 | tree |
5a167978 GDR |
3227 | current_decl_namespace (void) |
3228 | { | |
3229 | tree result; | |
3230 | /* If we have been pushed into a different namespace, use it. */ | |
2a4449a3 NF |
3231 | if (!VEC_empty (tree, decl_namespace_list)) |
3232 | return VEC_last (tree, decl_namespace_list); | |
5a167978 GDR |
3233 | |
3234 | if (current_class_type) | |
b1cc95ce | 3235 | result = decl_namespace_context (current_class_type); |
5a167978 | 3236 | else if (current_function_decl) |
b1cc95ce | 3237 | result = decl_namespace_context (current_function_decl); |
c8094d83 | 3238 | else |
5a167978 GDR |
3239 | result = current_namespace; |
3240 | return result; | |
3241 | } | |
3242 | ||
65567efa JM |
3243 | /* Process any ATTRIBUTES on a namespace definition. Currently only |
3244 | attribute visibility is meaningful, which is a property of the syntactic | |
3245 | block rather than the namespace as a whole, so we don't touch the | |
3246 | NAMESPACE_DECL at all. Returns true if attribute visibility is seen. */ | |
00e8de68 | 3247 | |
65567efa JM |
3248 | bool |
3249 | handle_namespace_attrs (tree ns, tree attributes) | |
0ed5edac | 3250 | { |
65567efa JM |
3251 | tree d; |
3252 | bool saw_vis = false; | |
0ed5edac | 3253 | |
65567efa JM |
3254 | for (d = attributes; d; d = TREE_CHAIN (d)) |
3255 | { | |
3256 | tree name = TREE_PURPOSE (d); | |
3257 | tree args = TREE_VALUE (d); | |
3258 | ||
65567efa JM |
3259 | if (is_attribute_p ("visibility", name)) |
3260 | { | |
3261 | tree x = args ? TREE_VALUE (args) : NULL_TREE; | |
3262 | if (x == NULL_TREE || TREE_CODE (x) != STRING_CST || TREE_CHAIN (args)) | |
3263 | { | |
3264 | warning (OPT_Wattributes, | |
3265 | "%qD attribute requires a single NTBS argument", | |
3266 | name); | |
3267 | continue; | |
3268 | } | |
3269 | ||
3270 | if (!TREE_PUBLIC (ns)) | |
3271 | warning (OPT_Wattributes, | |
3272 | "%qD attribute is meaningless since members of the " | |
3273 | "anonymous namespace get local symbols", name); | |
3274 | ||
9789ba46 | 3275 | push_visibility (TREE_STRING_POINTER (x), 1); |
65567efa JM |
3276 | saw_vis = true; |
3277 | } | |
3278 | else | |
65567efa JM |
3279 | { |
3280 | warning (OPT_Wattributes, "%qD attribute directive ignored", | |
3281 | name); | |
3282 | continue; | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | return saw_vis; | |
3287 | } | |
3288 | ||
3289 | /* Push into the scope of the NAME namespace. If NAME is NULL_TREE, then we | |
3290 | select a name that is unique to this compilation unit. */ | |
0ed5edac JM |
3291 | |
3292 | void | |
65567efa | 3293 | push_namespace (tree name) |
00e8de68 GDR |
3294 | { |
3295 | tree d = NULL_TREE; | |
3296 | int need_new = 1; | |
3297 | int implicit_use = 0; | |
ed36980c | 3298 | bool anon = !name; |
00e8de68 GDR |
3299 | |
3300 | timevar_push (TV_NAME_LOOKUP); | |
c8094d83 | 3301 | |
00e8de68 GDR |
3302 | /* We should not get here if the global_namespace is not yet constructed |
3303 | nor if NAME designates the global namespace: The global scope is | |
3304 | constructed elsewhere. */ | |
50bc768d | 3305 | gcc_assert (global_namespace != NULL && name != global_scope_name); |
00e8de68 | 3306 | |
ed36980c | 3307 | if (anon) |
00e8de68 | 3308 | { |
5880f14f | 3309 | name = get_anonymous_namespace_name(); |
00e8de68 GDR |
3310 | d = IDENTIFIER_NAMESPACE_VALUE (name); |
3311 | if (d) | |
0cbd7506 MS |
3312 | /* Reopening anonymous namespace. */ |
3313 | need_new = 0; | |
00e8de68 GDR |
3314 | implicit_use = 1; |
3315 | } | |
3316 | else | |
3317 | { | |
3318 | /* Check whether this is an extended namespace definition. */ | |
3319 | d = IDENTIFIER_NAMESPACE_VALUE (name); | |
3320 | if (d != NULL_TREE && TREE_CODE (d) == NAMESPACE_DECL) | |
0cbd7506 MS |
3321 | { |
3322 | need_new = 0; | |
3323 | if (DECL_NAMESPACE_ALIAS (d)) | |
3324 | { | |
3325 | error ("namespace alias %qD not allowed here, assuming %qD", | |
3326 | d, DECL_NAMESPACE_ALIAS (d)); | |
3327 | d = DECL_NAMESPACE_ALIAS (d); | |
3328 | } | |
3329 | } | |
00e8de68 GDR |
3330 | } |
3331 | ||
3332 | if (need_new) | |
3333 | { | |
3334 | /* Make a new namespace, binding the name to it. */ | |
3335 | d = build_lang_decl (NAMESPACE_DECL, name, void_type_node); | |
3336 | DECL_CONTEXT (d) = FROB_CONTEXT (current_namespace); | |
b9e75696 JM |
3337 | /* The name of this namespace is not visible to other translation |
3338 | units if it is an anonymous namespace or member thereof. */ | |
3339 | if (anon || decl_anon_ns_mem_p (current_namespace)) | |
3340 | TREE_PUBLIC (d) = 0; | |
3341 | else | |
3342 | TREE_PUBLIC (d) = 1; | |
c0694c4b | 3343 | pushdecl (d); |
ed36980c JM |
3344 | if (anon) |
3345 | { | |
3346 | /* Clear DECL_NAME for the benefit of debugging back ends. */ | |
3347 | SET_DECL_ASSEMBLER_NAME (d, name); | |
3348 | DECL_NAME (d) = NULL_TREE; | |
3349 | } | |
00e8de68 GDR |
3350 | begin_scope (sk_namespace, d); |
3351 | } | |
3352 | else | |
3353 | resume_scope (NAMESPACE_LEVEL (d)); | |
3354 | ||
3355 | if (implicit_use) | |
3356 | do_using_directive (d); | |
3357 | /* Enter the name space. */ | |
3358 | current_namespace = d; | |
3359 | ||
3360 | timevar_pop (TV_NAME_LOOKUP); | |
3361 | } | |
3362 | ||
3363 | /* Pop from the scope of the current namespace. */ | |
3364 | ||
3365 | void | |
3366 | pop_namespace (void) | |
3367 | { | |
50bc768d | 3368 | gcc_assert (current_namespace != global_namespace); |
00e8de68 GDR |
3369 | current_namespace = CP_DECL_CONTEXT (current_namespace); |
3370 | /* The binding level is not popped, as it might be re-opened later. */ | |
3371 | leave_scope (); | |
3372 | } | |
3373 | ||
3374 | /* Push into the scope of the namespace NS, even if it is deeply | |
3375 | nested within another namespace. */ | |
3376 | ||
3377 | void | |
3378 | push_nested_namespace (tree ns) | |
3379 | { | |
3380 | if (ns == global_namespace) | |
3381 | push_to_top_level (); | |
3382 | else | |
3383 | { | |
3384 | push_nested_namespace (CP_DECL_CONTEXT (ns)); | |
3385 | push_namespace (DECL_NAME (ns)); | |
3386 | } | |
3387 | } | |
3388 | ||
3389 | /* Pop back from the scope of the namespace NS, which was previously | |
3390 | entered with push_nested_namespace. */ | |
3391 | ||
3392 | void | |
3393 | pop_nested_namespace (tree ns) | |
3394 | { | |
3395 | timevar_push (TV_NAME_LOOKUP); | |
ae099258 | 3396 | gcc_assert (current_namespace == ns); |
00e8de68 GDR |
3397 | while (ns != global_namespace) |
3398 | { | |
3399 | pop_namespace (); | |
3400 | ns = CP_DECL_CONTEXT (ns); | |
3401 | } | |
3402 | ||
3403 | pop_from_top_level (); | |
3404 | timevar_pop (TV_NAME_LOOKUP); | |
3405 | } | |
3406 | ||
5a167978 GDR |
3407 | /* Temporarily set the namespace for the current declaration. */ |
3408 | ||
3409 | void | |
3410 | push_decl_namespace (tree decl) | |
3411 | { | |
3412 | if (TREE_CODE (decl) != NAMESPACE_DECL) | |
b1cc95ce | 3413 | decl = decl_namespace_context (decl); |
2a4449a3 | 3414 | VEC_safe_push (tree, gc, decl_namespace_list, ORIGINAL_NAMESPACE (decl)); |
5a167978 GDR |
3415 | } |
3416 | ||
3417 | /* [namespace.memdef]/2 */ | |
3418 | ||
3419 | void | |
3420 | pop_decl_namespace (void) | |
3421 | { | |
2a4449a3 | 3422 | VEC_pop (tree, decl_namespace_list); |
5a167978 GDR |
3423 | } |
3424 | ||
c8094d83 | 3425 | /* Return the namespace that is the common ancestor |
5a167978 GDR |
3426 | of two given namespaces. */ |
3427 | ||
a5e6b29b | 3428 | static tree |
5a167978 GDR |
3429 | namespace_ancestor (tree ns1, tree ns2) |
3430 | { | |
3431 | timevar_push (TV_NAME_LOOKUP); | |
3432 | if (is_ancestor (ns1, ns2)) | |
3433 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ns1); | |
3434 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 3435 | namespace_ancestor (CP_DECL_CONTEXT (ns1), ns2)); |
5a167978 GDR |
3436 | } |
3437 | ||
3438 | /* Process a namespace-alias declaration. */ | |
3439 | ||
3440 | void | |
be93747e | 3441 | do_namespace_alias (tree alias, tree name_space) |
5a167978 | 3442 | { |
be93747e | 3443 | if (name_space == error_mark_node) |
166206ce VR |
3444 | return; |
3445 | ||
be93747e | 3446 | gcc_assert (TREE_CODE (name_space) == NAMESPACE_DECL); |
5a167978 | 3447 | |
be93747e | 3448 | name_space = ORIGINAL_NAMESPACE (name_space); |
5a167978 GDR |
3449 | |
3450 | /* Build the alias. */ | |
c8094d83 | 3451 | alias = build_lang_decl (NAMESPACE_DECL, alias, void_type_node); |
be93747e | 3452 | DECL_NAMESPACE_ALIAS (alias) = name_space; |
5a167978 | 3453 | DECL_EXTERNAL (alias) = 1; |
6ac1920d | 3454 | DECL_CONTEXT (alias) = FROB_CONTEXT (current_scope ()); |
5a167978 | 3455 | pushdecl (alias); |
6097b0c3 DP |
3456 | |
3457 | /* Emit debug info for namespace alias. */ | |
47512a6e JJ |
3458 | if (!building_stmt_tree ()) |
3459 | (*debug_hooks->global_decl) (alias); | |
5a167978 GDR |
3460 | } |
3461 | ||
00e8de68 GDR |
3462 | /* Like pushdecl, only it places X in the current namespace, |
3463 | if appropriate. */ | |
3464 | ||
3465 | tree | |
d63d5d0c | 3466 | pushdecl_namespace_level (tree x, bool is_friend) |
00e8de68 | 3467 | { |
926ce8bd KH |
3468 | struct cp_binding_level *b = current_binding_level; |
3469 | tree t; | |
00e8de68 GDR |
3470 | |
3471 | timevar_push (TV_NAME_LOOKUP); | |
d63d5d0c | 3472 | t = pushdecl_with_scope (x, NAMESPACE_LEVEL (current_namespace), is_friend); |
00e8de68 GDR |
3473 | |
3474 | /* Now, the type_shadowed stack may screw us. Munge it so it does | |
3475 | what we want. */ | |
6fc98adf | 3476 | if (TREE_CODE (t) == TYPE_DECL) |
00e8de68 | 3477 | { |
6fc98adf | 3478 | tree name = DECL_NAME (t); |
00e8de68 GDR |
3479 | tree newval; |
3480 | tree *ptr = (tree *)0; | |
3481 | for (; !global_scope_p (b); b = b->level_chain) | |
0cbd7506 MS |
3482 | { |
3483 | tree shadowed = b->type_shadowed; | |
3484 | for (; shadowed; shadowed = TREE_CHAIN (shadowed)) | |
3485 | if (TREE_PURPOSE (shadowed) == name) | |
3486 | { | |
00e8de68 GDR |
3487 | ptr = &TREE_VALUE (shadowed); |
3488 | /* Can't break out of the loop here because sometimes | |
3489 | a binding level will have duplicate bindings for | |
3490 | PT names. It's gross, but I haven't time to fix it. */ | |
0cbd7506 MS |
3491 | } |
3492 | } | |
6fc98adf | 3493 | newval = TREE_TYPE (t); |
00e8de68 | 3494 | if (ptr == (tree *)0) |
0cbd7506 MS |
3495 | { |
3496 | /* @@ This shouldn't be needed. My test case "zstring.cc" trips | |
3497 | up here if this is changed to an assertion. --KR */ | |
6fc98adf | 3498 | SET_IDENTIFIER_TYPE_VALUE (name, t); |
00e8de68 GDR |
3499 | } |
3500 | else | |
0cbd7506 | 3501 | { |
00e8de68 | 3502 | *ptr = newval; |
0cbd7506 | 3503 | } |
00e8de68 GDR |
3504 | } |
3505 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
3506 | } | |
3507 | ||
5a167978 GDR |
3508 | /* Insert USED into the using list of USER. Set INDIRECT_flag if this |
3509 | directive is not directly from the source. Also find the common | |
3510 | ancestor and let our users know about the new namespace */ | |
c8094d83 | 3511 | static void |
5a167978 GDR |
3512 | add_using_namespace (tree user, tree used, bool indirect) |
3513 | { | |
3514 | tree t; | |
3515 | timevar_push (TV_NAME_LOOKUP); | |
3516 | /* Using oneself is a no-op. */ | |
3517 | if (user == used) | |
3518 | { | |
3519 | timevar_pop (TV_NAME_LOOKUP); | |
3520 | return; | |
3521 | } | |
50bc768d NS |
3522 | gcc_assert (TREE_CODE (user) == NAMESPACE_DECL); |
3523 | gcc_assert (TREE_CODE (used) == NAMESPACE_DECL); | |
5a167978 GDR |
3524 | /* Check if we already have this. */ |
3525 | t = purpose_member (used, DECL_NAMESPACE_USING (user)); | |
3526 | if (t != NULL_TREE) | |
3527 | { | |
3528 | if (!indirect) | |
3529 | /* Promote to direct usage. */ | |
3530 | TREE_INDIRECT_USING (t) = 0; | |
3531 | timevar_pop (TV_NAME_LOOKUP); | |
3532 | return; | |
3533 | } | |
3534 | ||
3535 | /* Add used to the user's using list. */ | |
c8094d83 MS |
3536 | DECL_NAMESPACE_USING (user) |
3537 | = tree_cons (used, namespace_ancestor (user, used), | |
5a167978 GDR |
3538 | DECL_NAMESPACE_USING (user)); |
3539 | ||
3540 | TREE_INDIRECT_USING (DECL_NAMESPACE_USING (user)) = indirect; | |
3541 | ||
3542 | /* Add user to the used's users list. */ | |
3543 | DECL_NAMESPACE_USERS (used) | |
3544 | = tree_cons (user, 0, DECL_NAMESPACE_USERS (used)); | |
3545 | ||
3546 | /* Recursively add all namespaces used. */ | |
3547 | for (t = DECL_NAMESPACE_USING (used); t; t = TREE_CHAIN (t)) | |
3548 | /* indirect usage */ | |
3549 | add_using_namespace (user, TREE_PURPOSE (t), 1); | |
3550 | ||
3551 | /* Tell everyone using us about the new used namespaces. */ | |
3552 | for (t = DECL_NAMESPACE_USERS (user); t; t = TREE_CHAIN (t)) | |
3553 | add_using_namespace (TREE_PURPOSE (t), used, 1); | |
3554 | timevar_pop (TV_NAME_LOOKUP); | |
3555 | } | |
3556 | ||
3557 | /* Process a using-declaration not appearing in class or local scope. */ | |
3558 | ||
3559 | void | |
ed5f054f | 3560 | do_toplevel_using_decl (tree decl, tree scope, tree name) |
5a167978 | 3561 | { |
5a167978 | 3562 | tree oldval, oldtype, newval, newtype; |
6097b0c3 | 3563 | tree orig_decl = decl; |
5a167978 GDR |
3564 | cxx_binding *binding; |
3565 | ||
ed5f054f | 3566 | decl = validate_nonmember_using_decl (decl, scope, name); |
5a167978 GDR |
3567 | if (decl == NULL_TREE) |
3568 | return; | |
c8094d83 | 3569 | |
5a167978 GDR |
3570 | binding = binding_for_name (NAMESPACE_LEVEL (current_namespace), name); |
3571 | ||
3572 | oldval = binding->value; | |
3573 | oldtype = binding->type; | |
3574 | ||
3575 | do_nonmember_using_decl (scope, name, oldval, oldtype, &newval, &newtype); | |
3576 | ||
6097b0c3 DP |
3577 | /* Emit debug info. */ |
3578 | if (!processing_template_decl) | |
3579 | cp_emit_debug_info_for_using (orig_decl, current_namespace); | |
3580 | ||
5a167978 GDR |
3581 | /* Copy declarations found. */ |
3582 | if (newval) | |
3583 | binding->value = newval; | |
3584 | if (newtype) | |
3585 | binding->type = newtype; | |
5a167978 GDR |
3586 | } |
3587 | ||
3588 | /* Process a using-directive. */ | |
3589 | ||
3590 | void | |
be93747e | 3591 | do_using_directive (tree name_space) |
5a167978 | 3592 | { |
6097b0c3 DP |
3593 | tree context = NULL_TREE; |
3594 | ||
be93747e | 3595 | if (name_space == error_mark_node) |
166206ce VR |
3596 | return; |
3597 | ||
be93747e | 3598 | gcc_assert (TREE_CODE (name_space) == NAMESPACE_DECL); |
166206ce | 3599 | |
5a167978 | 3600 | if (building_stmt_tree ()) |
c2255bc4 | 3601 | add_stmt (build_stmt (input_location, USING_STMT, name_space)); |
be93747e | 3602 | name_space = ORIGINAL_NAMESPACE (name_space); |
166206ce | 3603 | |
5a167978 | 3604 | if (!toplevel_bindings_p ()) |
6097b0c3 | 3605 | { |
be93747e | 3606 | push_using_directive (name_space); |
6097b0c3 | 3607 | } |
5a167978 | 3608 | else |
6097b0c3 DP |
3609 | { |
3610 | /* direct usage */ | |
be93747e | 3611 | add_using_namespace (current_namespace, name_space, 0); |
6097b0c3 DP |
3612 | if (current_namespace != global_namespace) |
3613 | context = current_namespace; | |
c8094d83 | 3614 | |
d19c0f4b DS |
3615 | /* Emit debugging info. */ |
3616 | if (!processing_template_decl) | |
3617 | (*debug_hooks->imported_module_or_decl) (name_space, NULL_TREE, | |
3618 | context, false); | |
3619 | } | |
5a167978 GDR |
3620 | } |
3621 | ||
86098eb8 JM |
3622 | /* Deal with a using-directive seen by the parser. Currently we only |
3623 | handle attributes here, since they cannot appear inside a template. */ | |
3624 | ||
3625 | void | |
be93747e | 3626 | parse_using_directive (tree name_space, tree attribs) |
86098eb8 JM |
3627 | { |
3628 | tree a; | |
3629 | ||
be93747e | 3630 | do_using_directive (name_space); |
86098eb8 JM |
3631 | |
3632 | for (a = attribs; a; a = TREE_CHAIN (a)) | |
3633 | { | |
3634 | tree name = TREE_PURPOSE (a); | |
3635 | if (is_attribute_p ("strong", name)) | |
3636 | { | |
3637 | if (!toplevel_bindings_p ()) | |
3638 | error ("strong using only meaningful at namespace scope"); | |
be93747e | 3639 | else if (name_space != error_mark_node) |
9deb204a | 3640 | { |
be93747e | 3641 | if (!is_ancestor (current_namespace, name_space)) |
9deb204a | 3642 | error ("current namespace %qD does not enclose strongly used namespace %qD", |
be93747e KG |
3643 | current_namespace, name_space); |
3644 | DECL_NAMESPACE_ASSOCIATIONS (name_space) | |
9deb204a | 3645 | = tree_cons (current_namespace, 0, |
be93747e | 3646 | DECL_NAMESPACE_ASSOCIATIONS (name_space)); |
9deb204a | 3647 | } |
86098eb8 JM |
3648 | } |
3649 | else | |
5c498b10 | 3650 | warning (OPT_Wattributes, "%qD attribute directive ignored", name); |
86098eb8 JM |
3651 | } |
3652 | } | |
3653 | ||
a5e6b29b GDR |
3654 | /* Like pushdecl, only it places X in the global scope if appropriate. |
3655 | Calls cp_finish_decl to register the variable, initializing it with | |
3656 | *INIT, if INIT is non-NULL. */ | |
3657 | ||
3658 | static tree | |
d63d5d0c | 3659 | pushdecl_top_level_1 (tree x, tree *init, bool is_friend) |
a5e6b29b GDR |
3660 | { |
3661 | timevar_push (TV_NAME_LOOKUP); | |
3662 | push_to_top_level (); | |
d63d5d0c | 3663 | x = pushdecl_namespace_level (x, is_friend); |
a5e6b29b | 3664 | if (init) |
3600f678 | 3665 | cp_finish_decl (x, *init, false, NULL_TREE, 0); |
a5e6b29b GDR |
3666 | pop_from_top_level (); |
3667 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
3668 | } | |
3669 | ||
3670 | /* Like pushdecl, only it places X in the global scope if appropriate. */ | |
3671 | ||
3672 | tree | |
3673 | pushdecl_top_level (tree x) | |
3674 | { | |
d63d5d0c ILT |
3675 | return pushdecl_top_level_1 (x, NULL, false); |
3676 | } | |
3677 | ||
3678 | /* Like pushdecl_top_level, but adding the IS_FRIEND parameter. */ | |
3679 | ||
3680 | tree | |
3681 | pushdecl_top_level_maybe_friend (tree x, bool is_friend) | |
3682 | { | |
3683 | return pushdecl_top_level_1 (x, NULL, is_friend); | |
a5e6b29b GDR |
3684 | } |
3685 | ||
3686 | /* Like pushdecl, only it places X in the global scope if | |
3687 | appropriate. Calls cp_finish_decl to register the variable, | |
3688 | initializing it with INIT. */ | |
3689 | ||
3690 | tree | |
3691 | pushdecl_top_level_and_finish (tree x, tree init) | |
3692 | { | |
d63d5d0c | 3693 | return pushdecl_top_level_1 (x, &init, false); |
a5e6b29b GDR |
3694 | } |
3695 | ||
5a167978 GDR |
3696 | /* Combines two sets of overloaded functions into an OVERLOAD chain, removing |
3697 | duplicates. The first list becomes the tail of the result. | |
3698 | ||
3699 | The algorithm is O(n^2). We could get this down to O(n log n) by | |
3700 | doing a sort on the addresses of the functions, if that becomes | |
3701 | necessary. */ | |
3702 | ||
3703 | static tree | |
3704 | merge_functions (tree s1, tree s2) | |
3705 | { | |
3706 | for (; s2; s2 = OVL_NEXT (s2)) | |
3707 | { | |
3708 | tree fn2 = OVL_CURRENT (s2); | |
3709 | tree fns1; | |
3710 | ||
3711 | for (fns1 = s1; fns1; fns1 = OVL_NEXT (fns1)) | |
3712 | { | |
3713 | tree fn1 = OVL_CURRENT (fns1); | |
3714 | ||
3715 | /* If the function from S2 is already in S1, there is no | |
3716 | need to add it again. For `extern "C"' functions, we | |
3717 | might have two FUNCTION_DECLs for the same function, in | |
e04c614e JM |
3718 | different namespaces, but let's leave them in in case |
3719 | they have different default arguments. */ | |
3720 | if (fn1 == fn2) | |
5a167978 GDR |
3721 | break; |
3722 | } | |
c8094d83 | 3723 | |
5a167978 GDR |
3724 | /* If we exhausted all of the functions in S1, FN2 is new. */ |
3725 | if (!fns1) | |
3726 | s1 = build_overload (fn2, s1); | |
3727 | } | |
3728 | return s1; | |
3729 | } | |
3730 | ||
1e003829 JM |
3731 | /* Returns TRUE iff OLD and NEW are the same entity. |
3732 | ||
3733 | 3 [basic]/3: An entity is a value, object, reference, function, | |
3734 | enumerator, type, class member, template, template specialization, | |
3735 | namespace, parameter pack, or this. | |
3736 | ||
3737 | 7.3.4 [namespace.udir]/4: If name lookup finds a declaration for a name | |
3738 | in two different namespaces, and the declarations do not declare the | |
3739 | same entity and do not declare functions, the use of the name is | |
3740 | ill-formed. */ | |
3741 | ||
3742 | static bool | |
3743 | same_entity_p (tree one, tree two) | |
3744 | { | |
3745 | if (one == two) | |
3746 | return true; | |
3747 | if (!one || !two) | |
3748 | return false; | |
3749 | if (TREE_CODE (one) == TYPE_DECL | |
3750 | && TREE_CODE (two) == TYPE_DECL | |
3751 | && same_type_p (TREE_TYPE (one), TREE_TYPE (two))) | |
3752 | return true; | |
3753 | return false; | |
3754 | } | |
3755 | ||
5a167978 GDR |
3756 | /* This should return an error not all definitions define functions. |
3757 | It is not an error if we find two functions with exactly the | |
3758 | same signature, only if these are selected in overload resolution. | |
be93747e | 3759 | old is the current set of bindings, new_binding the freshly-found binding. |
5a167978 GDR |
3760 | XXX Do we want to give *all* candidates in case of ambiguity? |
3761 | XXX In what way should I treat extern declarations? | |
3762 | XXX I don't want to repeat the entire duplicate_decls here */ | |
3763 | ||
15f8ac7f | 3764 | static void |
be93747e | 3765 | ambiguous_decl (struct scope_binding *old, cxx_binding *new_binding, int flags) |
5a167978 GDR |
3766 | { |
3767 | tree val, type; | |
50bc768d | 3768 | gcc_assert (old != NULL); |
af92ab36 OW |
3769 | |
3770 | /* Copy the type. */ | |
be93747e | 3771 | type = new_binding->type; |
af92ab36 OW |
3772 | if (LOOKUP_NAMESPACES_ONLY (flags) |
3773 | || (type && hidden_name_p (type) && !(flags & LOOKUP_HIDDEN))) | |
3774 | type = NULL_TREE; | |
3775 | ||
5a167978 | 3776 | /* Copy the value. */ |
be93747e | 3777 | val = new_binding->value; |
5a167978 | 3778 | if (val) |
af92ab36 OW |
3779 | { |
3780 | if (hidden_name_p (val) && !(flags & LOOKUP_HIDDEN)) | |
3781 | val = NULL_TREE; | |
3782 | else | |
3783 | switch (TREE_CODE (val)) | |
3784 | { | |
3785 | case TEMPLATE_DECL: | |
3786 | /* If we expect types or namespaces, and not templates, | |
3787 | or this is not a template class. */ | |
3788 | if ((LOOKUP_QUALIFIERS_ONLY (flags) | |
3789 | && !DECL_CLASS_TEMPLATE_P (val))) | |
3790 | val = NULL_TREE; | |
3791 | break; | |
3792 | case TYPE_DECL: | |
3793 | if (LOOKUP_NAMESPACES_ONLY (flags) | |
3794 | || (type && (flags & LOOKUP_PREFER_TYPES))) | |
3795 | val = NULL_TREE; | |
3796 | break; | |
3797 | case NAMESPACE_DECL: | |
3798 | if (LOOKUP_TYPES_ONLY (flags)) | |
3799 | val = NULL_TREE; | |
3800 | break; | |
3801 | case FUNCTION_DECL: | |
3802 | /* Ignore built-in functions that are still anticipated. */ | |
3803 | if (LOOKUP_QUALIFIERS_ONLY (flags)) | |
3804 | val = NULL_TREE; | |
3805 | break; | |
3806 | default: | |
3807 | if (LOOKUP_QUALIFIERS_ONLY (flags)) | |
3808 | val = NULL_TREE; | |
3809 | } | |
3810 | } | |
3811 | ||
3812 | /* If val is hidden, shift down any class or enumeration name. */ | |
3813 | if (!val) | |
3814 | { | |
3815 | val = type; | |
3816 | type = NULL_TREE; | |
3817 | } | |
c8094d83 | 3818 | |
5a167978 GDR |
3819 | if (!old->value) |
3820 | old->value = val; | |
1e003829 | 3821 | else if (val && !same_entity_p (val, old->value)) |
5a167978 GDR |
3822 | { |
3823 | if (is_overloaded_fn (old->value) && is_overloaded_fn (val)) | |
0cbd7506 | 3824 | old->value = merge_functions (old->value, val); |
5a167978 GDR |
3825 | else |
3826 | { | |
91b1ca65 | 3827 | old->value = tree_cons (NULL_TREE, old->value, |
af92ab36 | 3828 | build_tree_list (NULL_TREE, val)); |
91b1ca65 | 3829 | TREE_TYPE (old->value) = error_mark_node; |
5a167978 GDR |
3830 | } |
3831 | } | |
af92ab36 | 3832 | |
5a167978 GDR |
3833 | if (!old->type) |
3834 | old->type = type; | |
3835 | else if (type && old->type != type) | |
3836 | { | |
19831e2b OW |
3837 | old->type = tree_cons (NULL_TREE, old->type, |
3838 | build_tree_list (NULL_TREE, type)); | |
3839 | TREE_TYPE (old->type) = error_mark_node; | |
5a167978 | 3840 | } |
5a167978 GDR |
3841 | } |
3842 | ||
00e8de68 GDR |
3843 | /* Return the declarations that are members of the namespace NS. */ |
3844 | ||
3845 | tree | |
3846 | cp_namespace_decls (tree ns) | |
3847 | { | |
3848 | return NAMESPACE_LEVEL (ns)->names; | |
3849 | } | |
3850 | ||
3851 | /* Combine prefer_type and namespaces_only into flags. */ | |
3852 | ||
3853 | static int | |
3854 | lookup_flags (int prefer_type, int namespaces_only) | |
3855 | { | |
3856 | if (namespaces_only) | |
3857 | return LOOKUP_PREFER_NAMESPACES; | |
3858 | if (prefer_type > 1) | |
3859 | return LOOKUP_PREFER_TYPES; | |
3860 | if (prefer_type > 0) | |
3861 | return LOOKUP_PREFER_BOTH; | |
3862 | return 0; | |
3863 | } | |
3864 | ||
3865 | /* Given a lookup that returned VAL, use FLAGS to decide if we want to | |
bd3d082e KL |
3866 | ignore it or not. Subroutine of lookup_name_real and |
3867 | lookup_type_scope. */ | |
00e8de68 | 3868 | |
bd3d082e | 3869 | static bool |
00e8de68 GDR |
3870 | qualify_lookup (tree val, int flags) |
3871 | { | |
3872 | if (val == NULL_TREE) | |
bd3d082e | 3873 | return false; |
00e8de68 | 3874 | if ((flags & LOOKUP_PREFER_NAMESPACES) && TREE_CODE (val) == NAMESPACE_DECL) |
bd3d082e | 3875 | return true; |
00e8de68 GDR |
3876 | if ((flags & LOOKUP_PREFER_TYPES) |
3877 | && (TREE_CODE (val) == TYPE_DECL || TREE_CODE (val) == TEMPLATE_DECL)) | |
bd3d082e | 3878 | return true; |
00e8de68 | 3879 | if (flags & (LOOKUP_PREFER_NAMESPACES | LOOKUP_PREFER_TYPES)) |
bd3d082e | 3880 | return false; |
37a7519a | 3881 | /* In unevaluated context, look past normal capture fields. */ |
d5f4eddd | 3882 | if (cp_unevaluated_operand && TREE_CODE (val) == FIELD_DECL |
37a7519a | 3883 | && DECL_NORMAL_CAPTURE_P (val)) |
d5f4eddd | 3884 | return false; |
a6846853 JM |
3885 | /* None of the lookups that use qualify_lookup want the op() from the |
3886 | lambda; they want the one from the enclosing class. */ | |
3887 | if (TREE_CODE (val) == FUNCTION_DECL && LAMBDA_FUNCTION_P (val)) | |
3888 | return false; | |
bd3d082e KL |
3889 | return true; |
3890 | } | |
3891 | ||
c8094d83 | 3892 | /* Given a lookup that returned VAL, decide if we want to ignore it or |
d63d5d0c | 3893 | not based on DECL_ANTICIPATED. */ |
bd3d082e KL |
3894 | |
3895 | bool | |
3896 | hidden_name_p (tree val) | |
3897 | { | |
3898 | if (DECL_P (val) | |
3899 | && DECL_LANG_SPECIFIC (val) | |
3900 | && DECL_ANTICIPATED (val)) | |
3901 | return true; | |
3902 | return false; | |
00e8de68 GDR |
3903 | } |
3904 | ||
d63d5d0c ILT |
3905 | /* Remove any hidden friend functions from a possibly overloaded set |
3906 | of functions. */ | |
3907 | ||
3908 | tree | |
3909 | remove_hidden_names (tree fns) | |
3910 | { | |
3911 | if (!fns) | |
3912 | return fns; | |
3913 | ||
3914 | if (TREE_CODE (fns) == FUNCTION_DECL && hidden_name_p (fns)) | |
3915 | fns = NULL_TREE; | |
3916 | else if (TREE_CODE (fns) == OVERLOAD) | |
3917 | { | |
3918 | tree o; | |
3919 | ||
3920 | for (o = fns; o; o = OVL_NEXT (o)) | |
3921 | if (hidden_name_p (OVL_CURRENT (o))) | |
3922 | break; | |
3923 | if (o) | |
3924 | { | |
3925 | tree n = NULL_TREE; | |
3926 | ||
3927 | for (o = fns; o; o = OVL_NEXT (o)) | |
3928 | if (!hidden_name_p (OVL_CURRENT (o))) | |
3929 | n = build_overload (OVL_CURRENT (o), n); | |
3930 | fns = n; | |
3931 | } | |
3932 | } | |
3933 | ||
3934 | return fns; | |
3935 | } | |
3936 | ||
501c95ff NF |
3937 | /* Suggest alternatives for NAME, an IDENTIFIER_NODE for which name |
3938 | lookup failed. Search through all available namespaces and print out | |
3939 | possible candidates. */ | |
3940 | ||
3941 | void | |
993acb36 | 3942 | suggest_alternatives_for (location_t location, tree name) |
501c95ff NF |
3943 | { |
3944 | VEC(tree,heap) *candidates = NULL; | |
3945 | VEC(tree,heap) *namespaces_to_search = NULL; | |
3946 | int max_to_search = PARAM_VALUE (CXX_MAX_NAMESPACES_FOR_DIAGNOSTIC_HELP); | |
3947 | int n_searched = 0; | |
3948 | tree t; | |
3949 | unsigned ix; | |
501c95ff NF |
3950 | |
3951 | VEC_safe_push (tree, heap, namespaces_to_search, global_namespace); | |
3952 | ||
3953 | while (!VEC_empty (tree, namespaces_to_search) | |
3954 | && n_searched < max_to_search) | |
3955 | { | |
3956 | tree scope = VEC_pop (tree, namespaces_to_search); | |
3957 | struct scope_binding binding = EMPTY_SCOPE_BINDING; | |
3958 | struct cp_binding_level *level = NAMESPACE_LEVEL (scope); | |
3959 | ||
3960 | /* Look in this namespace. */ | |
3961 | qualified_lookup_using_namespace (name, scope, &binding, 0); | |
3962 | ||
3963 | n_searched++; | |
3964 | ||
3965 | if (binding.value) | |
3966 | VEC_safe_push (tree, heap, candidates, binding.value); | |
3967 | ||
3968 | /* Add child namespaces. */ | |
3969 | for (t = level->namespaces; t; t = DECL_CHAIN (t)) | |
3970 | VEC_safe_push (tree, heap, namespaces_to_search, t); | |
3971 | } | |
3972 | ||
501c95ff NF |
3973 | /* If we stopped before we could examine all namespaces, inform the |
3974 | user. Do this even if we don't have any candidates, since there | |
3975 | might be more candidates further down that we weren't able to | |
3976 | find. */ | |
3977 | if (n_searched >= max_to_search | |
3978 | && !VEC_empty (tree, namespaces_to_search)) | |
993acb36 | 3979 | inform (location, |
501c95ff NF |
3980 | "maximum limit of %d namespaces searched for %qE", |
3981 | max_to_search, name); | |
3982 | ||
3983 | VEC_free (tree, heap, namespaces_to_search); | |
3984 | ||
3985 | /* Nothing useful to report. */ | |
3986 | if (VEC_empty (tree, candidates)) | |
3987 | return; | |
3988 | ||
993acb36 | 3989 | inform_n (location, VEC_length (tree, candidates), |
501c95ff NF |
3990 | "suggested alternative:", |
3991 | "suggested alternatives:"); | |
3992 | ||
3993 | FOR_EACH_VEC_ELT (tree, candidates, ix, t) | |
3994 | inform (location_of (t), " %qE", t); | |
3995 | ||
3996 | VEC_free (tree, heap, candidates); | |
3997 | } | |
3998 | ||
00e8de68 | 3999 | /* Unscoped lookup of a global: iterate over current namespaces, |
543ebd4a | 4000 | considering using-directives. */ |
00e8de68 | 4001 | |
a5e6b29b | 4002 | static tree |
543ebd4a | 4003 | unqualified_namespace_lookup (tree name, int flags) |
00e8de68 GDR |
4004 | { |
4005 | tree initial = current_decl_namespace (); | |
4006 | tree scope = initial; | |
4007 | tree siter; | |
4008 | struct cp_binding_level *level; | |
4009 | tree val = NULL_TREE; | |
00e8de68 GDR |
4010 | |
4011 | timevar_push (TV_NAME_LOOKUP); | |
00e8de68 GDR |
4012 | |
4013 | for (; !val; scope = CP_DECL_CONTEXT (scope)) | |
4014 | { | |
af92ab36 | 4015 | struct scope_binding binding = EMPTY_SCOPE_BINDING; |
00e8de68 | 4016 | cxx_binding *b = |
0cbd7506 | 4017 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); |
00e8de68 | 4018 | |
ba18e4db | 4019 | if (b) |
19831e2b | 4020 | ambiguous_decl (&binding, b, flags); |
00e8de68 GDR |
4021 | |
4022 | /* Add all _DECLs seen through local using-directives. */ | |
4023 | for (level = current_binding_level; | |
4024 | level->kind != sk_namespace; | |
4025 | level = level->level_chain) | |
4026 | if (!lookup_using_namespace (name, &binding, level->using_directives, | |
0cbd7506 | 4027 | scope, flags)) |
00e8de68 GDR |
4028 | /* Give up because of error. */ |
4029 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
4030 | ||
4031 | /* Add all _DECLs seen through global using-directives. */ | |
4032 | /* XXX local and global using lists should work equally. */ | |
4033 | siter = initial; | |
4034 | while (1) | |
4035 | { | |
4036 | if (!lookup_using_namespace (name, &binding, | |
0cbd7506 | 4037 | DECL_NAMESPACE_USING (siter), |
543ebd4a | 4038 | scope, flags)) |
00e8de68 GDR |
4039 | /* Give up because of error. */ |
4040 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
4041 | if (siter == scope) break; | |
4042 | siter = CP_DECL_CONTEXT (siter); | |
4043 | } | |
4044 | ||
af92ab36 | 4045 | val = binding.value; |
00e8de68 GDR |
4046 | if (scope == global_namespace) |
4047 | break; | |
4048 | } | |
4049 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
4050 | } | |
4051 | ||
4052 | /* Look up NAME (an IDENTIFIER_NODE) in SCOPE (either a NAMESPACE_DECL | |
4053 | or a class TYPE). If IS_TYPE_P is TRUE, then ignore non-type | |
c8094d83 | 4054 | bindings. |
00e8de68 GDR |
4055 | |
4056 | Returns a DECL (or OVERLOAD, or BASELINK) representing the | |
4057 | declaration found. If no suitable declaration can be found, | |
8f78f01f | 4058 | ERROR_MARK_NODE is returned. If COMPLAIN is true and SCOPE is |
00e8de68 GDR |
4059 | neither a class-type nor a namespace a diagnostic is issued. */ |
4060 | ||
4061 | tree | |
4062 | lookup_qualified_name (tree scope, tree name, bool is_type_p, bool complain) | |
4063 | { | |
4064 | int flags = 0; | |
ff8fe3e0 | 4065 | tree t = NULL_TREE; |
00e8de68 GDR |
4066 | |
4067 | if (TREE_CODE (scope) == NAMESPACE_DECL) | |
4068 | { | |
15f8ac7f | 4069 | struct scope_binding binding = EMPTY_SCOPE_BINDING; |
00e8de68 | 4070 | |
00e8de68 GDR |
4071 | flags |= LOOKUP_COMPLAIN; |
4072 | if (is_type_p) | |
4073 | flags |= LOOKUP_PREFER_TYPES; | |
543ebd4a | 4074 | if (qualified_lookup_using_namespace (name, scope, &binding, flags)) |
af92ab36 | 4075 | t = binding.value; |
00e8de68 | 4076 | } |
adf2edec DG |
4077 | else if (cxx_dialect != cxx98 && TREE_CODE (scope) == ENUMERAL_TYPE) |
4078 | t = lookup_enumerator (scope, name); | |
9e1e64ec | 4079 | else if (is_class_type (scope, complain)) |
ff8fe3e0 | 4080 | t = lookup_member (scope, name, 2, is_type_p); |
00e8de68 | 4081 | |
ff8fe3e0 VR |
4082 | if (!t) |
4083 | return error_mark_node; | |
4084 | return t; | |
00e8de68 GDR |
4085 | } |
4086 | ||
cd0be382 | 4087 | /* Subroutine of unqualified_namespace_lookup: |
5a167978 GDR |
4088 | Add the bindings of NAME in used namespaces to VAL. |
4089 | We are currently looking for names in namespace SCOPE, so we | |
4090 | look through USINGS for using-directives of namespaces | |
4091 | which have SCOPE as a common ancestor with the current scope. | |
4092 | Returns false on errors. */ | |
4093 | ||
a5e6b29b | 4094 | static bool |
15f8ac7f GK |
4095 | lookup_using_namespace (tree name, struct scope_binding *val, |
4096 | tree usings, tree scope, int flags) | |
5a167978 GDR |
4097 | { |
4098 | tree iter; | |
4099 | timevar_push (TV_NAME_LOOKUP); | |
4100 | /* Iterate over all used namespaces in current, searching for using | |
4101 | directives of scope. */ | |
4102 | for (iter = usings; iter; iter = TREE_CHAIN (iter)) | |
4103 | if (TREE_VALUE (iter) == scope) | |
4104 | { | |
0cbd7506 MS |
4105 | tree used = ORIGINAL_NAMESPACE (TREE_PURPOSE (iter)); |
4106 | cxx_binding *val1 = | |
4107 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (used), name); | |
4108 | /* Resolve ambiguities. */ | |
4109 | if (val1) | |
19831e2b | 4110 | ambiguous_decl (val, val1, flags); |
5a167978 GDR |
4111 | } |
4112 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val->value != error_mark_node); | |
4113 | } | |
4114 | ||
160594b0 JM |
4115 | /* Returns true iff VEC contains TARGET. */ |
4116 | ||
4117 | static bool | |
4118 | tree_vec_contains (VEC(tree,gc)* vec, tree target) | |
4119 | { | |
4120 | unsigned int i; | |
4121 | tree elt; | |
ac47786e | 4122 | FOR_EACH_VEC_ELT (tree,vec,i,elt) |
160594b0 JM |
4123 | if (elt == target) |
4124 | return true; | |
4125 | return false; | |
4126 | } | |
4127 | ||
5a167978 GDR |
4128 | /* [namespace.qual] |
4129 | Accepts the NAME to lookup and its qualifying SCOPE. | |
4130 | Returns the name/type pair found into the cxx_binding *RESULT, | |
4131 | or false on error. */ | |
4132 | ||
a5e6b29b | 4133 | static bool |
15f8ac7f GK |
4134 | qualified_lookup_using_namespace (tree name, tree scope, |
4135 | struct scope_binding *result, int flags) | |
5a167978 GDR |
4136 | { |
4137 | /* Maintain a list of namespaces visited... */ | |
160594b0 JM |
4138 | VEC(tree,gc) *seen = NULL; |
4139 | VEC(tree,gc) *seen_inline = NULL; | |
5a167978 | 4140 | /* ... and a list of namespace yet to see. */ |
160594b0 JM |
4141 | VEC(tree,gc) *todo = NULL; |
4142 | VEC(tree,gc) *todo_maybe = NULL; | |
4143 | VEC(tree,gc) *todo_inline = NULL; | |
5a167978 GDR |
4144 | tree usings; |
4145 | timevar_push (TV_NAME_LOOKUP); | |
4146 | /* Look through namespace aliases. */ | |
4147 | scope = ORIGINAL_NAMESPACE (scope); | |
160594b0 | 4148 | |
dd5a833e | 4149 | /* Algorithm: Starting with SCOPE, walk through the set of used |
160594b0 | 4150 | namespaces. For each used namespace, look through its inline |
dd5a833e MS |
4151 | namespace set for any bindings and usings. If no bindings are |
4152 | found, add any usings seen to the set of used namespaces. */ | |
160594b0 JM |
4153 | VEC_safe_push (tree, gc, todo, scope); |
4154 | ||
4155 | while (VEC_length (tree, todo)) | |
5a167978 | 4156 | { |
160594b0 JM |
4157 | bool found_here; |
4158 | scope = VEC_pop (tree, todo); | |
4159 | if (tree_vec_contains (seen, scope)) | |
4160 | continue; | |
4161 | VEC_safe_push (tree, gc, seen, scope); | |
4162 | VEC_safe_push (tree, gc, todo_inline, scope); | |
4163 | ||
4164 | found_here = false; | |
4165 | while (VEC_length (tree, todo_inline)) | |
dc55c941 | 4166 | { |
160594b0 JM |
4167 | cxx_binding *binding; |
4168 | ||
4169 | scope = VEC_pop (tree, todo_inline); | |
4170 | if (tree_vec_contains (seen_inline, scope)) | |
4171 | continue; | |
4172 | VEC_safe_push (tree, gc, seen_inline, scope); | |
4173 | ||
4174 | binding = | |
4175 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); | |
4176 | if (binding) | |
4177 | { | |
4178 | found_here = true; | |
4179 | ambiguous_decl (result, binding, flags); | |
4180 | } | |
4181 | ||
4182 | for (usings = DECL_NAMESPACE_USING (scope); usings; | |
4183 | usings = TREE_CHAIN (usings)) | |
4184 | if (!TREE_INDIRECT_USING (usings)) | |
4185 | { | |
4186 | if (is_associated_namespace (scope, TREE_PURPOSE (usings))) | |
4187 | VEC_safe_push (tree, gc, todo_inline, TREE_PURPOSE (usings)); | |
4188 | else | |
4189 | VEC_safe_push (tree, gc, todo_maybe, TREE_PURPOSE (usings)); | |
4190 | } | |
dc55c941 | 4191 | } |
160594b0 JM |
4192 | |
4193 | if (found_here) | |
4194 | VEC_truncate (tree, todo_maybe, 0); | |
5a167978 | 4195 | else |
160594b0 JM |
4196 | while (VEC_length (tree, todo_maybe)) |
4197 | VEC_safe_push (tree, gc, todo, VEC_pop (tree, todo_maybe)); | |
4198 | } | |
4199 | VEC_free (tree,gc,todo); | |
4200 | VEC_free (tree,gc,todo_maybe); | |
4201 | VEC_free (tree,gc,todo_inline); | |
4202 | VEC_free (tree,gc,seen); | |
4203 | VEC_free (tree,gc,seen_inline); | |
5a167978 GDR |
4204 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, result->value != error_mark_node); |
4205 | } | |
4206 | ||
172a4594 | 4207 | /* Subroutine of outer_binding. |
9ca6556e DS |
4208 | |
4209 | Returns TRUE if BINDING is a binding to a template parameter of | |
4210 | SCOPE. In that case SCOPE is the scope of a primary template | |
4211 | parameter -- in the sense of G++, i.e, a template that has its own | |
4212 | template header. | |
4213 | ||
4214 | Returns FALSE otherwise. */ | |
172a4594 DS |
4215 | |
4216 | static bool | |
4217 | binding_to_template_parms_of_scope_p (cxx_binding *binding, | |
4218 | cxx_scope *scope) | |
4219 | { | |
4220 | tree binding_value; | |
4221 | ||
4222 | if (!binding || !scope) | |
4223 | return false; | |
4224 | ||
4225 | binding_value = binding->value ? binding->value : binding->type; | |
4226 | ||
4227 | return (scope | |
4228 | && scope->this_entity | |
4229 | && get_template_info (scope->this_entity) | |
9ca6556e DS |
4230 | && PRIMARY_TEMPLATE_P (TI_TEMPLATE |
4231 | (get_template_info (scope->this_entity))) | |
172a4594 DS |
4232 | && parameter_of_template_p (binding_value, |
4233 | TI_TEMPLATE (get_template_info \ | |
4234 | (scope->this_entity)))); | |
4235 | } | |
4236 | ||
90ea9897 | 4237 | /* Return the innermost non-namespace binding for NAME from a scope |
172a4594 DS |
4238 | containing BINDING, or, if BINDING is NULL, the current scope. |
4239 | Please note that for a given template, the template parameters are | |
4240 | considered to be in the scope containing the current scope. | |
4241 | If CLASS_P is false, then class bindings are ignored. */ | |
90ea9897 MM |
4242 | |
4243 | cxx_binding * | |
c8094d83 | 4244 | outer_binding (tree name, |
90ea9897 MM |
4245 | cxx_binding *binding, |
4246 | bool class_p) | |
4247 | { | |
4248 | cxx_binding *outer; | |
4249 | cxx_scope *scope; | |
4250 | cxx_scope *outer_scope; | |
4251 | ||
4252 | if (binding) | |
4253 | { | |
4254 | scope = binding->scope->level_chain; | |
4255 | outer = binding->previous; | |
4256 | } | |
4257 | else | |
4258 | { | |
4259 | scope = current_binding_level; | |
4260 | outer = IDENTIFIER_BINDING (name); | |
4261 | } | |
4262 | outer_scope = outer ? outer->scope : NULL; | |
4263 | ||
4264 | /* Because we create class bindings lazily, we might be missing a | |
4265 | class binding for NAME. If there are any class binding levels | |
4266 | between the LAST_BINDING_LEVEL and the scope in which OUTER was | |
4267 | declared, we must lookup NAME in those class scopes. */ | |
4268 | if (class_p) | |
4269 | while (scope && scope != outer_scope && scope->kind != sk_namespace) | |
4270 | { | |
c8094d83 | 4271 | if (scope->kind == sk_class) |
90ea9897 MM |
4272 | { |
4273 | cxx_binding *class_binding; | |
c8094d83 | 4274 | |
90ea9897 MM |
4275 | class_binding = get_class_binding (name, scope); |
4276 | if (class_binding) | |
4277 | { | |
4278 | /* Thread this new class-scope binding onto the | |
4279 | IDENTIFIER_BINDING list so that future lookups | |
4280 | find it quickly. */ | |
4281 | class_binding->previous = outer; | |
4282 | if (binding) | |
4283 | binding->previous = class_binding; | |
4284 | else | |
4285 | IDENTIFIER_BINDING (name) = class_binding; | |
4286 | return class_binding; | |
4287 | } | |
4288 | } | |
8e39b368 JM |
4289 | /* If we are in a member template, the template parms of the member |
4290 | template are considered to be inside the scope of the containing | |
4291 | class, but within G++ the class bindings are all pushed between the | |
4292 | template parms and the function body. So if the outer binding is | |
4293 | a template parm for the current scope, return it now rather than | |
4294 | look for a class binding. */ | |
172a4594 DS |
4295 | if (outer_scope && outer_scope->kind == sk_template_parms |
4296 | && binding_to_template_parms_of_scope_p (outer, scope)) | |
4297 | return outer; | |
4298 | ||
90ea9897 MM |
4299 | scope = scope->level_chain; |
4300 | } | |
4301 | ||
4302 | return outer; | |
4303 | } | |
4304 | ||
4305 | /* Return the innermost block-scope or class-scope value binding for | |
4306 | NAME, or NULL_TREE if there is no such binding. */ | |
4307 | ||
4308 | tree | |
4309 | innermost_non_namespace_value (tree name) | |
4310 | { | |
4311 | cxx_binding *binding; | |
4312 | binding = outer_binding (name, /*binding=*/NULL, /*class_p=*/true); | |
4313 | return binding ? binding->value : NULL_TREE; | |
4314 | } | |
4315 | ||
00e8de68 GDR |
4316 | /* Look up NAME in the current binding level and its superiors in the |
4317 | namespace of variables, functions and typedefs. Return a ..._DECL | |
4318 | node of some kind representing its definition if there is only one | |
4319 | such declaration, or return a TREE_LIST with all the overloaded | |
4320 | definitions if there are many, or return 0 if it is undefined. | |
bd3d082e KL |
4321 | Hidden name, either friend declaration or built-in function, are |
4322 | not ignored. | |
00e8de68 GDR |
4323 | |
4324 | If PREFER_TYPE is > 0, we prefer TYPE_DECLs or namespaces. | |
4325 | If PREFER_TYPE is > 1, we reject non-type decls (e.g. namespaces). | |
4326 | Otherwise we prefer non-TYPE_DECLs. | |
4327 | ||
39fb05d0 MM |
4328 | If NONCLASS is nonzero, bindings in class scopes are ignored. If |
4329 | BLOCK_P is false, bindings in block scopes are ignored. */ | |
00e8de68 GDR |
4330 | |
4331 | tree | |
12cf89fa | 4332 | lookup_name_real (tree name, int prefer_type, int nonclass, bool block_p, |
00e8de68 GDR |
4333 | int namespaces_only, int flags) |
4334 | { | |
4335 | cxx_binding *iter; | |
4336 | tree val = NULL_TREE; | |
4337 | ||
4338 | timevar_push (TV_NAME_LOOKUP); | |
4339 | /* Conversion operators are handled specially because ordinary | |
4340 | unqualified name lookup will not find template conversion | |
4341 | operators. */ | |
c8094d83 | 4342 | if (IDENTIFIER_TYPENAME_P (name)) |
00e8de68 GDR |
4343 | { |
4344 | struct cp_binding_level *level; | |
4345 | ||
c8094d83 | 4346 | for (level = current_binding_level; |
00e8de68 GDR |
4347 | level && level->kind != sk_namespace; |
4348 | level = level->level_chain) | |
4349 | { | |
4350 | tree class_type; | |
4351 | tree operators; | |
c8094d83 MS |
4352 | |
4353 | /* A conversion operator can only be declared in a class | |
00e8de68 GDR |
4354 | scope. */ |
4355 | if (level->kind != sk_class) | |
4356 | continue; | |
c8094d83 | 4357 | |
00e8de68 GDR |
4358 | /* Lookup the conversion operator in the class. */ |
4359 | class_type = level->this_entity; | |
4360 | operators = lookup_fnfields (class_type, name, /*protect=*/0); | |
4361 | if (operators) | |
4362 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, operators); | |
4363 | } | |
4364 | ||
4365 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
4366 | } | |
4367 | ||
4368 | flags |= lookup_flags (prefer_type, namespaces_only); | |
4369 | ||
4370 | /* First, look in non-namespace scopes. */ | |
4371 | ||
4372 | if (current_class_type == NULL_TREE) | |
4373 | nonclass = 1; | |
4374 | ||
12cf89fa | 4375 | if (block_p || !nonclass) |
90ea9897 MM |
4376 | for (iter = outer_binding (name, NULL, !nonclass); |
4377 | iter; | |
4378 | iter = outer_binding (name, iter, !nonclass)) | |
12cf89fa MM |
4379 | { |
4380 | tree binding; | |
c8094d83 | 4381 | |
12cf89fa MM |
4382 | /* Skip entities we don't want. */ |
4383 | if (LOCAL_BINDING_P (iter) ? !block_p : nonclass) | |
4384 | continue; | |
c8094d83 | 4385 | |
12cf89fa | 4386 | /* If this is the kind of thing we're looking for, we're done. */ |
105d72c5 | 4387 | if (qualify_lookup (iter->value, flags)) |
12cf89fa MM |
4388 | binding = iter->value; |
4389 | else if ((flags & LOOKUP_PREFER_TYPES) | |
105d72c5 | 4390 | && qualify_lookup (iter->type, flags)) |
12cf89fa MM |
4391 | binding = iter->type; |
4392 | else | |
4393 | binding = NULL_TREE; | |
c8094d83 | 4394 | |
12cf89fa MM |
4395 | if (binding) |
4396 | { | |
d4d8c232 SM |
4397 | if (hidden_name_p (binding)) |
4398 | { | |
b9f673eb JM |
4399 | /* A non namespace-scope binding can only be hidden in the |
4400 | presence of a local class, due to friend declarations. | |
4401 | ||
d4d8c232 SM |
4402 | In particular, consider: |
4403 | ||
b9f673eb | 4404 | struct C; |
d4d8c232 SM |
4405 | void f() { |
4406 | struct A { | |
4407 | friend struct B; | |
b9f673eb JM |
4408 | friend struct C; |
4409 | void g() { | |
4410 | B* b; // error: B is hidden | |
4411 | C* c; // OK, finds ::C | |
4412 | } | |
4413 | }; | |
4414 | B *b; // error: B is hidden | |
4415 | C *c; // OK, finds ::C | |
d4d8c232 | 4416 | struct B {}; |
b9f673eb | 4417 | B *bb; // OK |
d4d8c232 SM |
4418 | } |
4419 | ||
4420 | The standard says that "B" is a local class in "f" | |
4421 | (but not nested within "A") -- but that name lookup | |
4422 | for "B" does not find this declaration until it is | |
4423 | declared directly with "f". | |
4424 | ||
4425 | In particular: | |
4426 | ||
4427 | [class.friend] | |
4428 | ||
4429 | If a friend declaration appears in a local class and | |
4430 | the name specified is an unqualified name, a prior | |
4431 | declaration is looked up without considering scopes | |
4432 | that are outside the innermost enclosing non-class | |
b9f673eb JM |
4433 | scope. For a friend function declaration, if there is |
4434 | no prior declaration, the program is ill-formed. For a | |
4435 | friend class declaration, if there is no prior | |
4436 | declaration, the class that is specified belongs to the | |
4437 | innermost enclosing non-class scope, but if it is | |
4438 | subsequently referenced, its name is not found by name | |
4439 | lookup until a matching declaration is provided in the | |
4440 | innermost enclosing nonclass scope. | |
4441 | ||
4442 | So just keep looking for a non-hidden binding. | |
d4d8c232 | 4443 | */ |
b9f673eb JM |
4444 | gcc_assert (TREE_CODE (binding) == TYPE_DECL); |
4445 | continue; | |
d4d8c232 | 4446 | } |
12cf89fa MM |
4447 | val = binding; |
4448 | break; | |
4449 | } | |
4450 | } | |
00e8de68 GDR |
4451 | |
4452 | /* Now lookup in namespace scopes. */ | |
4453 | if (!val) | |
29ef83de | 4454 | val = unqualified_namespace_lookup (name, flags); |
00e8de68 | 4455 | |
0c8ce11b VR |
4456 | /* If we have a single function from a using decl, pull it out. */ |
4457 | if (val && TREE_CODE (val) == OVERLOAD && !really_overloaded_fn (val)) | |
4458 | val = OVL_FUNCTION (val); | |
00e8de68 GDR |
4459 | |
4460 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
4461 | } | |
4462 | ||
4463 | tree | |
4464 | lookup_name_nonclass (tree name) | |
4465 | { | |
12cf89fa | 4466 | return lookup_name_real (name, 0, 1, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
4467 | } |
4468 | ||
4469 | tree | |
c166b898 | 4470 | lookup_function_nonclass (tree name, VEC(tree,gc) *args, bool block_p) |
00e8de68 | 4471 | { |
c8094d83 MS |
4472 | return |
4473 | lookup_arg_dependent (name, | |
4474 | lookup_name_real (name, 0, 1, block_p, 0, | |
12cf89fa | 4475 | LOOKUP_COMPLAIN), |
f9132eb7 | 4476 | args, false); |
00e8de68 GDR |
4477 | } |
4478 | ||
4479 | tree | |
10e6657a | 4480 | lookup_name (tree name) |
00e8de68 | 4481 | { |
10e6657a | 4482 | return lookup_name_real (name, 0, 0, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
4483 | } |
4484 | ||
98803730 | 4485 | tree |
10e6657a | 4486 | lookup_name_prefer_type (tree name, int prefer_type) |
98803730 | 4487 | { |
10e6657a RH |
4488 | return lookup_name_real (name, prefer_type, 0, /*block_p=*/true, |
4489 | 0, LOOKUP_COMPLAIN); | |
98803730 MS |
4490 | } |
4491 | ||
461c6fce | 4492 | /* Look up NAME for type used in elaborated name specifier in |
29ef83de | 4493 | the scopes given by SCOPE. SCOPE can be either TS_CURRENT or |
87c465f5 KL |
4494 | TS_WITHIN_ENCLOSING_NON_CLASS. Although not implied by the |
4495 | name, more scopes are checked if cleanup or template parameter | |
4496 | scope is encountered. | |
29ef83de KL |
4497 | |
4498 | Unlike lookup_name_real, we make sure that NAME is actually | |
87c465f5 KL |
4499 | declared in the desired scope, not from inheritance, nor using |
4500 | directive. For using declaration, there is DR138 still waiting | |
13a44ee0 | 4501 | to be resolved. Hidden name coming from an earlier friend |
bd3d082e | 4502 | declaration is also returned. |
87c465f5 KL |
4503 | |
4504 | A TYPE_DECL best matching the NAME is returned. Catching error | |
4505 | and issuing diagnostics are caller's responsibility. */ | |
461c6fce KL |
4506 | |
4507 | tree | |
29ef83de | 4508 | lookup_type_scope (tree name, tag_scope scope) |
461c6fce KL |
4509 | { |
4510 | cxx_binding *iter = NULL; | |
4511 | tree val = NULL_TREE; | |
4512 | ||
4513 | timevar_push (TV_NAME_LOOKUP); | |
4514 | ||
4515 | /* Look in non-namespace scope first. */ | |
4516 | if (current_binding_level->kind != sk_namespace) | |
4517 | iter = outer_binding (name, NULL, /*class_p=*/ true); | |
4518 | for (; iter; iter = outer_binding (name, iter, /*class_p=*/ true)) | |
4519 | { | |
4520 | /* Check if this is the kind of thing we're looking for. | |
c8094d83 | 4521 | If SCOPE is TS_CURRENT, also make sure it doesn't come from |
29ef83de | 4522 | base class. For ITER->VALUE, we can simply use |
c8094d83 | 4523 | INHERITED_VALUE_BINDING_P. For ITER->TYPE, we have to use |
29ef83de | 4524 | our own check. |
461c6fce KL |
4525 | |
4526 | We check ITER->TYPE before ITER->VALUE in order to handle | |
4527 | typedef struct C {} C; | |
4528 | correctly. */ | |
4529 | ||
4530 | if (qualify_lookup (iter->type, LOOKUP_PREFER_TYPES) | |
29ef83de KL |
4531 | && (scope != ts_current |
4532 | || LOCAL_BINDING_P (iter) | |
461c6fce KL |
4533 | || DECL_CONTEXT (iter->type) == iter->scope->this_entity)) |
4534 | val = iter->type; | |
29ef83de KL |
4535 | else if ((scope != ts_current |
4536 | || !INHERITED_VALUE_BINDING_P (iter)) | |
461c6fce KL |
4537 | && qualify_lookup (iter->value, LOOKUP_PREFER_TYPES)) |
4538 | val = iter->value; | |
4539 | ||
4540 | if (val) | |
4541 | break; | |
4542 | } | |
4543 | ||
4544 | /* Look in namespace scope. */ | |
4545 | if (!val) | |
4546 | { | |
4547 | iter = cxx_scope_find_binding_for_name | |
4548 | (NAMESPACE_LEVEL (current_decl_namespace ()), name); | |
4549 | ||
4550 | if (iter) | |
4551 | { | |
bd3d082e | 4552 | /* If this is the kind of thing we're looking for, we're done. */ |
87c465f5 | 4553 | if (qualify_lookup (iter->type, LOOKUP_PREFER_TYPES)) |
461c6fce | 4554 | val = iter->type; |
87c465f5 | 4555 | else if (qualify_lookup (iter->value, LOOKUP_PREFER_TYPES)) |
461c6fce KL |
4556 | val = iter->value; |
4557 | } | |
c8094d83 | 4558 | |
461c6fce KL |
4559 | } |
4560 | ||
29ef83de | 4561 | /* Type found, check if it is in the allowed scopes, ignoring cleanup |
461c6fce KL |
4562 | and template parameter scopes. */ |
4563 | if (val) | |
4564 | { | |
4565 | struct cp_binding_level *b = current_binding_level; | |
4566 | while (b) | |
4567 | { | |
4568 | if (iter->scope == b) | |
4569 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
4570 | ||
118dde55 JM |
4571 | if (b->kind == sk_cleanup || b->kind == sk_template_parms |
4572 | || b->kind == sk_function_parms) | |
461c6fce | 4573 | b = b->level_chain; |
29ef83de KL |
4574 | else if (b->kind == sk_class |
4575 | && scope == ts_within_enclosing_non_class) | |
4576 | b = b->level_chain; | |
461c6fce KL |
4577 | else |
4578 | break; | |
4579 | } | |
4580 | } | |
4581 | ||
4582 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
4583 | } | |
4584 | ||
00e8de68 GDR |
4585 | /* Similar to `lookup_name' but look only in the innermost non-class |
4586 | binding level. */ | |
4587 | ||
7655e009 | 4588 | tree |
461c6fce | 4589 | lookup_name_innermost_nonclass_level (tree name) |
00e8de68 GDR |
4590 | { |
4591 | struct cp_binding_level *b; | |
4592 | tree t = NULL_TREE; | |
4593 | ||
4594 | timevar_push (TV_NAME_LOOKUP); | |
4595 | b = innermost_nonclass_level (); | |
4596 | ||
4597 | if (b->kind == sk_namespace) | |
4598 | { | |
4599 | t = IDENTIFIER_NAMESPACE_VALUE (name); | |
4600 | ||
4601 | /* extern "C" function() */ | |
4602 | if (t != NULL_TREE && TREE_CODE (t) == TREE_LIST) | |
4603 | t = TREE_VALUE (t); | |
4604 | } | |
4605 | else if (IDENTIFIER_BINDING (name) | |
4606 | && LOCAL_BINDING_P (IDENTIFIER_BINDING (name))) | |
4607 | { | |
90ea9897 MM |
4608 | cxx_binding *binding; |
4609 | binding = IDENTIFIER_BINDING (name); | |
00e8de68 GDR |
4610 | while (1) |
4611 | { | |
90ea9897 MM |
4612 | if (binding->scope == b |
4613 | && !(TREE_CODE (binding->value) == VAR_DECL | |
4614 | && DECL_DEAD_FOR_LOCAL (binding->value))) | |
4615 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, binding->value); | |
00e8de68 GDR |
4616 | |
4617 | if (b->kind == sk_cleanup) | |
4618 | b = b->level_chain; | |
4619 | else | |
4620 | break; | |
4621 | } | |
4622 | } | |
4623 | ||
4624 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
4625 | } | |
4626 | ||
e8f43da6 JM |
4627 | /* Returns true iff DECL is a block-scope extern declaration of a function |
4628 | or variable. */ | |
4629 | ||
4630 | bool | |
4631 | is_local_extern (tree decl) | |
4632 | { | |
4633 | cxx_binding *binding; | |
4634 | ||
4635 | /* For functions, this is easy. */ | |
4636 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
4637 | return DECL_LOCAL_FUNCTION_P (decl); | |
4638 | ||
4639 | if (TREE_CODE (decl) != VAR_DECL) | |
4640 | return false; | |
4641 | if (!current_function_decl) | |
4642 | return false; | |
4643 | ||
4644 | /* For variables, this is not easy. We need to look at the binding stack | |
4645 | for the identifier to see whether the decl we have is a local. */ | |
4646 | for (binding = IDENTIFIER_BINDING (DECL_NAME (decl)); | |
4647 | binding && binding->scope->kind != sk_namespace; | |
4648 | binding = binding->previous) | |
4649 | if (binding->value == decl) | |
4650 | return LOCAL_BINDING_P (binding); | |
4651 | ||
4652 | return false; | |
4653 | } | |
4654 | ||
461c6fce | 4655 | /* Like lookup_name_innermost_nonclass_level, but for types. */ |
00e8de68 | 4656 | |
a5e6b29b | 4657 | static tree |
00e8de68 GDR |
4658 | lookup_type_current_level (tree name) |
4659 | { | |
926ce8bd | 4660 | tree t = NULL_TREE; |
00e8de68 GDR |
4661 | |
4662 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d | 4663 | gcc_assert (current_binding_level->kind != sk_namespace); |
00e8de68 GDR |
4664 | |
4665 | if (REAL_IDENTIFIER_TYPE_VALUE (name) != NULL_TREE | |
4666 | && REAL_IDENTIFIER_TYPE_VALUE (name) != global_type_node) | |
4667 | { | |
4668 | struct cp_binding_level *b = current_binding_level; | |
4669 | while (1) | |
4670 | { | |
4671 | if (purpose_member (name, b->type_shadowed)) | |
4672 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 4673 | REAL_IDENTIFIER_TYPE_VALUE (name)); |
00e8de68 GDR |
4674 | if (b->kind == sk_cleanup) |
4675 | b = b->level_chain; | |
4676 | else | |
4677 | break; | |
4678 | } | |
4679 | } | |
4680 | ||
4681 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
4682 | } | |
4683 | ||
5a167978 GDR |
4684 | /* [basic.lookup.koenig] */ |
4685 | /* A nonzero return value in the functions below indicates an error. */ | |
4686 | ||
4687 | struct arg_lookup | |
4688 | { | |
4689 | tree name; | |
c166b898 | 4690 | VEC(tree,gc) *args; |
bfdb7b70 NF |
4691 | VEC(tree,gc) *namespaces; |
4692 | VEC(tree,gc) *classes; | |
5a167978 GDR |
4693 | tree functions; |
4694 | }; | |
4695 | ||
4696 | static bool arg_assoc (struct arg_lookup*, tree); | |
4697 | static bool arg_assoc_args (struct arg_lookup*, tree); | |
c166b898 | 4698 | static bool arg_assoc_args_vec (struct arg_lookup*, VEC(tree,gc) *); |
5a167978 GDR |
4699 | static bool arg_assoc_type (struct arg_lookup*, tree); |
4700 | static bool add_function (struct arg_lookup *, tree); | |
4701 | static bool arg_assoc_namespace (struct arg_lookup *, tree); | |
db10df3d JM |
4702 | static bool arg_assoc_class_only (struct arg_lookup *, tree); |
4703 | static bool arg_assoc_bases (struct arg_lookup *, tree); | |
5a167978 GDR |
4704 | static bool arg_assoc_class (struct arg_lookup *, tree); |
4705 | static bool arg_assoc_template_arg (struct arg_lookup*, tree); | |
4706 | ||
4707 | /* Add a function to the lookup structure. | |
4708 | Returns true on error. */ | |
4709 | ||
4710 | static bool | |
4711 | add_function (struct arg_lookup *k, tree fn) | |
4712 | { | |
4713 | /* We used to check here to see if the function was already in the list, | |
4714 | but that's O(n^2), which is just too expensive for function lookup. | |
4715 | Now we deal with the occasional duplicate in joust. In doing this, we | |
4716 | assume that the number of duplicates will be small compared to the | |
4717 | total number of functions being compared, which should usually be the | |
4718 | case. */ | |
4719 | ||
ac3554c5 JM |
4720 | if (!is_overloaded_fn (fn)) |
4721 | /* All names except those of (possibly overloaded) functions and | |
4722 | function templates are ignored. */; | |
4723 | else if (!k->functions) | |
5a167978 GDR |
4724 | k->functions = fn; |
4725 | else if (fn == k->functions) | |
4726 | ; | |
5a167978 | 4727 | else |
3a2cb4d0 JM |
4728 | { |
4729 | k->functions = build_overload (fn, k->functions); | |
4730 | if (TREE_CODE (k->functions) == OVERLOAD) | |
4731 | OVL_ARG_DEPENDENT (k->functions) = true; | |
4732 | } | |
5a167978 GDR |
4733 | |
4734 | return false; | |
4735 | } | |
4736 | ||
86098eb8 JM |
4737 | /* Returns true iff CURRENT has declared itself to be an associated |
4738 | namespace of SCOPE via a strong using-directive (or transitive chain | |
4739 | thereof). Both are namespaces. */ | |
4740 | ||
4741 | bool | |
4742 | is_associated_namespace (tree current, tree scope) | |
4743 | { | |
d4ccba66 NF |
4744 | VEC(tree,gc) *seen = make_tree_vector (); |
4745 | VEC(tree,gc) *todo = make_tree_vector (); | |
86098eb8 | 4746 | tree t; |
d4ccba66 NF |
4747 | bool ret; |
4748 | ||
86098eb8 JM |
4749 | while (1) |
4750 | { | |
4751 | if (scope == current) | |
d4ccba66 NF |
4752 | { |
4753 | ret = true; | |
4754 | break; | |
4755 | } | |
4756 | VEC_safe_push (tree, gc, seen, scope); | |
86098eb8 | 4757 | for (t = DECL_NAMESPACE_ASSOCIATIONS (scope); t; t = TREE_CHAIN (t)) |
d4ccba66 NF |
4758 | if (!vec_member (TREE_PURPOSE (t), seen)) |
4759 | VEC_safe_push (tree, gc, todo, TREE_PURPOSE (t)); | |
4760 | if (!VEC_empty (tree, todo)) | |
86098eb8 | 4761 | { |
d4ccba66 NF |
4762 | scope = VEC_last (tree, todo); |
4763 | VEC_pop (tree, todo); | |
86098eb8 JM |
4764 | } |
4765 | else | |
d4ccba66 NF |
4766 | { |
4767 | ret = false; | |
4768 | break; | |
4769 | } | |
86098eb8 | 4770 | } |
d4ccba66 NF |
4771 | |
4772 | release_tree_vector (seen); | |
4773 | release_tree_vector (todo); | |
4774 | ||
4775 | return ret; | |
86098eb8 JM |
4776 | } |
4777 | ||
5a167978 GDR |
4778 | /* Add functions of a namespace to the lookup structure. |
4779 | Returns true on error. */ | |
4780 | ||
4781 | static bool | |
4782 | arg_assoc_namespace (struct arg_lookup *k, tree scope) | |
4783 | { | |
4784 | tree value; | |
4785 | ||
bfdb7b70 NF |
4786 | if (vec_member (scope, k->namespaces)) |
4787 | return false; | |
4788 | VEC_safe_push (tree, gc, k->namespaces, scope); | |
86098eb8 JM |
4789 | |
4790 | /* Check out our super-users. */ | |
4791 | for (value = DECL_NAMESPACE_ASSOCIATIONS (scope); value; | |
4792 | value = TREE_CHAIN (value)) | |
4793 | if (arg_assoc_namespace (k, TREE_PURPOSE (value))) | |
4794 | return true; | |
c8094d83 | 4795 | |
4cfaec1c JM |
4796 | /* Also look down into inline namespaces. */ |
4797 | for (value = DECL_NAMESPACE_USING (scope); value; | |
4798 | value = TREE_CHAIN (value)) | |
4799 | if (is_associated_namespace (scope, TREE_PURPOSE (value))) | |
4800 | if (arg_assoc_namespace (k, TREE_PURPOSE (value))) | |
4801 | return true; | |
4802 | ||
5a167978 GDR |
4803 | value = namespace_binding (k->name, scope); |
4804 | if (!value) | |
4805 | return false; | |
4806 | ||
4807 | for (; value; value = OVL_NEXT (value)) | |
d63d5d0c ILT |
4808 | { |
4809 | /* We don't want to find arbitrary hidden functions via argument | |
4810 | dependent lookup. We only want to find friends of associated | |
db10df3d | 4811 | classes, which we'll do via arg_assoc_class. */ |
d63d5d0c | 4812 | if (hidden_name_p (OVL_CURRENT (value))) |
db10df3d | 4813 | continue; |
d63d5d0c ILT |
4814 | |
4815 | if (add_function (k, OVL_CURRENT (value))) | |
4816 | return true; | |
4817 | } | |
c8094d83 | 4818 | |
5a167978 GDR |
4819 | return false; |
4820 | } | |
4821 | ||
4822 | /* Adds everything associated with a template argument to the lookup | |
4823 | structure. Returns true on error. */ | |
4824 | ||
4825 | static bool | |
4826 | arg_assoc_template_arg (struct arg_lookup *k, tree arg) | |
4827 | { | |
4828 | /* [basic.lookup.koenig] | |
4829 | ||
4830 | If T is a template-id, its associated namespaces and classes are | |
4831 | ... the namespaces and classes associated with the types of the | |
4832 | template arguments provided for template type parameters | |
4833 | (excluding template template parameters); the namespaces in which | |
4834 | any template template arguments are defined; and the classes in | |
4835 | which any member templates used as template template arguments | |
4836 | are defined. [Note: non-type template arguments do not | |
4837 | contribute to the set of associated namespaces. ] */ | |
4838 | ||
4839 | /* Consider first template template arguments. */ | |
4840 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
4841 | || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE) | |
4842 | return false; | |
4843 | else if (TREE_CODE (arg) == TEMPLATE_DECL) | |
4844 | { | |
4845 | tree ctx = CP_DECL_CONTEXT (arg); | |
4846 | ||
4847 | /* It's not a member template. */ | |
4848 | if (TREE_CODE (ctx) == NAMESPACE_DECL) | |
0cbd7506 | 4849 | return arg_assoc_namespace (k, ctx); |
5a167978 | 4850 | /* Otherwise, it must be member template. */ |
c8094d83 | 4851 | else |
db10df3d | 4852 | return arg_assoc_class_only (k, ctx); |
5a167978 | 4853 | } |
ba796308 DG |
4854 | /* It's an argument pack; handle it recursively. */ |
4855 | else if (ARGUMENT_PACK_P (arg)) | |
4856 | { | |
4857 | tree args = ARGUMENT_PACK_ARGS (arg); | |
4858 | int i, len = TREE_VEC_LENGTH (args); | |
4859 | for (i = 0; i < len; ++i) | |
4860 | if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, i))) | |
4861 | return true; | |
4862 | ||
4863 | return false; | |
4864 | } | |
5a167978 GDR |
4865 | /* It's not a template template argument, but it is a type template |
4866 | argument. */ | |
4867 | else if (TYPE_P (arg)) | |
4868 | return arg_assoc_type (k, arg); | |
4869 | /* It's a non-type template argument. */ | |
4870 | else | |
4871 | return false; | |
4872 | } | |
4873 | ||
db10df3d | 4874 | /* Adds the class and its friends to the lookup structure. |
5a167978 GDR |
4875 | Returns true on error. */ |
4876 | ||
4877 | static bool | |
db10df3d | 4878 | arg_assoc_class_only (struct arg_lookup *k, tree type) |
5a167978 GDR |
4879 | { |
4880 | tree list, friends, context; | |
c8094d83 | 4881 | |
db10df3d | 4882 | /* Backend-built structures, such as __builtin_va_list, aren't |
5a167978 GDR |
4883 | affected by all this. */ |
4884 | if (!CLASS_TYPE_P (type)) | |
4885 | return false; | |
4886 | ||
b1cc95ce | 4887 | context = decl_namespace_context (type); |
5a167978 GDR |
4888 | if (arg_assoc_namespace (k, context)) |
4889 | return true; | |
ccb14335 | 4890 | |
2395cd2e JM |
4891 | complete_type (type); |
4892 | ||
5a167978 | 4893 | /* Process friends. */ |
c8094d83 | 4894 | for (list = DECL_FRIENDLIST (TYPE_MAIN_DECL (type)); list; |
5a167978 GDR |
4895 | list = TREE_CHAIN (list)) |
4896 | if (k->name == FRIEND_NAME (list)) | |
c8094d83 | 4897 | for (friends = FRIEND_DECLS (list); friends; |
5a167978 | 4898 | friends = TREE_CHAIN (friends)) |
c8b2e872 MM |
4899 | { |
4900 | tree fn = TREE_VALUE (friends); | |
4901 | ||
4902 | /* Only interested in global functions with potentially hidden | |
4903 | (i.e. unqualified) declarations. */ | |
4904 | if (CP_DECL_CONTEXT (fn) != context) | |
4905 | continue; | |
4906 | /* Template specializations are never found by name lookup. | |
4907 | (Templates themselves can be found, but not template | |
4908 | specializations.) */ | |
4909 | if (TREE_CODE (fn) == FUNCTION_DECL && DECL_USE_TEMPLATE (fn)) | |
4910 | continue; | |
4911 | if (add_function (k, fn)) | |
5a167978 | 4912 | return true; |
c8b2e872 | 4913 | } |
5a167978 | 4914 | |
db10df3d JM |
4915 | return false; |
4916 | } | |
4917 | ||
4918 | /* Adds the class and its bases to the lookup structure. | |
4919 | Returns true on error. */ | |
4920 | ||
4921 | static bool | |
4922 | arg_assoc_bases (struct arg_lookup *k, tree type) | |
4923 | { | |
4924 | if (arg_assoc_class_only (k, type)) | |
4925 | return true; | |
4926 | ||
4927 | if (TYPE_BINFO (type)) | |
4928 | { | |
4929 | /* Process baseclasses. */ | |
4930 | tree binfo, base_binfo; | |
4931 | int i; | |
4932 | ||
4933 | for (binfo = TYPE_BINFO (type), i = 0; | |
4934 | BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
4935 | if (arg_assoc_bases (k, BINFO_TYPE (base_binfo))) | |
4936 | return true; | |
4937 | } | |
4938 | ||
4939 | return false; | |
4940 | } | |
4941 | ||
4942 | /* Adds everything associated with a class argument type to the lookup | |
4943 | structure. Returns true on error. | |
4944 | ||
4945 | If T is a class type (including unions), its associated classes are: the | |
4946 | class itself; the class of which it is a member, if any; and its direct | |
4947 | and indirect base classes. Its associated namespaces are the namespaces | |
4948 | of which its associated classes are members. Furthermore, if T is a | |
4949 | class template specialization, its associated namespaces and classes | |
4950 | also include: the namespaces and classes associated with the types of | |
4951 | the template arguments provided for template type parameters (excluding | |
4952 | template template parameters); the namespaces of which any template | |
4953 | template arguments are members; and the classes of which any member | |
4954 | templates used as template template arguments are members. [ Note: | |
4955 | non-type template arguments do not contribute to the set of associated | |
4956 | namespaces. --end note] */ | |
4957 | ||
4958 | static bool | |
4959 | arg_assoc_class (struct arg_lookup *k, tree type) | |
4960 | { | |
4961 | tree list; | |
4962 | int i; | |
4963 | ||
4964 | /* Backend build structures, such as __builtin_va_list, aren't | |
4965 | affected by all this. */ | |
4966 | if (!CLASS_TYPE_P (type)) | |
4967 | return false; | |
4968 | ||
bfdb7b70 | 4969 | if (vec_member (type, k->classes)) |
db10df3d | 4970 | return false; |
bfdb7b70 | 4971 | VEC_safe_push (tree, gc, k->classes, type); |
db10df3d JM |
4972 | |
4973 | if (TYPE_CLASS_SCOPE_P (type) | |
4974 | && arg_assoc_class_only (k, TYPE_CONTEXT (type))) | |
4975 | return true; | |
4976 | ||
4977 | if (arg_assoc_bases (k, type)) | |
4978 | return true; | |
4979 | ||
5a167978 | 4980 | /* Process template arguments. */ |
c8094d83 | 4981 | if (CLASSTYPE_TEMPLATE_INFO (type) |
146d3c99 | 4982 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type))) |
5a167978 GDR |
4983 | { |
4984 | list = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type)); | |
c8094d83 | 4985 | for (i = 0; i < TREE_VEC_LENGTH (list); ++i) |
db10df3d JM |
4986 | if (arg_assoc_template_arg (k, TREE_VEC_ELT (list, i))) |
4987 | return true; | |
5a167978 GDR |
4988 | } |
4989 | ||
4990 | return false; | |
4991 | } | |
4992 | ||
4993 | /* Adds everything associated with a given type. | |
4994 | Returns 1 on error. */ | |
4995 | ||
4996 | static bool | |
4997 | arg_assoc_type (struct arg_lookup *k, tree type) | |
4998 | { | |
4999 | /* As we do not get the type of non-type dependent expressions | |
5000 | right, we can end up with such things without a type. */ | |
5001 | if (!type) | |
5002 | return false; | |
5003 | ||
5004 | if (TYPE_PTRMEM_P (type)) | |
5005 | { | |
5006 | /* Pointer to member: associate class type and value type. */ | |
5007 | if (arg_assoc_type (k, TYPE_PTRMEM_CLASS_TYPE (type))) | |
5008 | return true; | |
5009 | return arg_assoc_type (k, TYPE_PTRMEM_POINTED_TO_TYPE (type)); | |
5010 | } | |
5011 | else switch (TREE_CODE (type)) | |
5012 | { | |
5013 | case ERROR_MARK: | |
5014 | return false; | |
5015 | case VOID_TYPE: | |
5016 | case INTEGER_TYPE: | |
5017 | case REAL_TYPE: | |
5018 | case COMPLEX_TYPE: | |
5019 | case VECTOR_TYPE: | |
5a167978 | 5020 | case BOOLEAN_TYPE: |
50a70b6b | 5021 | case FIXED_POINT_TYPE: |
3feb128f | 5022 | case DECLTYPE_TYPE: |
1e85e720 | 5023 | case NULLPTR_TYPE: |
5a167978 GDR |
5024 | return false; |
5025 | case RECORD_TYPE: | |
5026 | if (TYPE_PTRMEMFUNC_P (type)) | |
5027 | return arg_assoc_type (k, TYPE_PTRMEMFUNC_FN_TYPE (type)); | |
db10df3d | 5028 | case UNION_TYPE: |
5a167978 GDR |
5029 | return arg_assoc_class (k, type); |
5030 | case POINTER_TYPE: | |
5031 | case REFERENCE_TYPE: | |
5032 | case ARRAY_TYPE: | |
5033 | return arg_assoc_type (k, TREE_TYPE (type)); | |
5a167978 | 5034 | case ENUMERAL_TYPE: |
db10df3d JM |
5035 | if (TYPE_CLASS_SCOPE_P (type) |
5036 | && arg_assoc_class_only (k, TYPE_CONTEXT (type))) | |
5037 | return true; | |
b1cc95ce | 5038 | return arg_assoc_namespace (k, decl_namespace_context (type)); |
5a167978 GDR |
5039 | case METHOD_TYPE: |
5040 | /* The basetype is referenced in the first arg type, so just | |
5041 | fall through. */ | |
5042 | case FUNCTION_TYPE: | |
5043 | /* Associate the parameter types. */ | |
5044 | if (arg_assoc_args (k, TYPE_ARG_TYPES (type))) | |
5045 | return true; | |
5046 | /* Associate the return type. */ | |
5047 | return arg_assoc_type (k, TREE_TYPE (type)); | |
5048 | case TEMPLATE_TYPE_PARM: | |
5049 | case BOUND_TEMPLATE_TEMPLATE_PARM: | |
5050 | return false; | |
5051 | case TYPENAME_TYPE: | |
5052 | return false; | |
5053 | case LANG_TYPE: | |
09357846 JM |
5054 | gcc_assert (type == unknown_type_node |
5055 | || type == init_list_type_node); | |
315fb5db | 5056 | return false; |
5d80a306 DG |
5057 | case TYPE_PACK_EXPANSION: |
5058 | return arg_assoc_type (k, PACK_EXPANSION_PATTERN (type)); | |
5d80a306 | 5059 | |
5a167978 | 5060 | default: |
315fb5db | 5061 | gcc_unreachable (); |
5a167978 GDR |
5062 | } |
5063 | return false; | |
5064 | } | |
5065 | ||
5066 | /* Adds everything associated with arguments. Returns true on error. */ | |
5067 | ||
5068 | static bool | |
5069 | arg_assoc_args (struct arg_lookup *k, tree args) | |
5070 | { | |
5071 | for (; args; args = TREE_CHAIN (args)) | |
5072 | if (arg_assoc (k, TREE_VALUE (args))) | |
5073 | return true; | |
5074 | return false; | |
5075 | } | |
5076 | ||
c166b898 ILT |
5077 | /* Adds everything associated with an argument vector. Returns true |
5078 | on error. */ | |
5079 | ||
5080 | static bool | |
5081 | arg_assoc_args_vec (struct arg_lookup *k, VEC(tree,gc) *args) | |
5082 | { | |
5083 | unsigned int ix; | |
5084 | tree arg; | |
5085 | ||
ac47786e | 5086 | FOR_EACH_VEC_ELT (tree, args, ix, arg) |
c166b898 ILT |
5087 | if (arg_assoc (k, arg)) |
5088 | return true; | |
5089 | return false; | |
5090 | } | |
5091 | ||
5a167978 GDR |
5092 | /* Adds everything associated with a given tree_node. Returns 1 on error. */ |
5093 | ||
5094 | static bool | |
5095 | arg_assoc (struct arg_lookup *k, tree n) | |
5096 | { | |
5097 | if (n == error_mark_node) | |
5098 | return false; | |
5099 | ||
5100 | if (TYPE_P (n)) | |
5101 | return arg_assoc_type (k, n); | |
5102 | ||
5103 | if (! type_unknown_p (n)) | |
5104 | return arg_assoc_type (k, TREE_TYPE (n)); | |
5105 | ||
5106 | if (TREE_CODE (n) == ADDR_EXPR) | |
5107 | n = TREE_OPERAND (n, 0); | |
5108 | if (TREE_CODE (n) == COMPONENT_REF) | |
5109 | n = TREE_OPERAND (n, 1); | |
5110 | if (TREE_CODE (n) == OFFSET_REF) | |
5111 | n = TREE_OPERAND (n, 1); | |
5112 | while (TREE_CODE (n) == TREE_LIST) | |
5113 | n = TREE_VALUE (n); | |
5114 | if (TREE_CODE (n) == BASELINK) | |
5115 | n = BASELINK_FUNCTIONS (n); | |
5116 | ||
5117 | if (TREE_CODE (n) == FUNCTION_DECL) | |
5118 | return arg_assoc_type (k, TREE_TYPE (n)); | |
5119 | if (TREE_CODE (n) == TEMPLATE_ID_EXPR) | |
5120 | { | |
db10df3d JM |
5121 | /* The working paper doesn't currently say how to handle template-id |
5122 | arguments. The sensible thing would seem to be to handle the list | |
5123 | of template candidates like a normal overload set, and handle the | |
5124 | template arguments like we do for class template | |
5125 | specializations. */ | |
be93747e | 5126 | tree templ = TREE_OPERAND (n, 0); |
5a167978 | 5127 | tree args = TREE_OPERAND (n, 1); |
5a167978 GDR |
5128 | int ix; |
5129 | ||
db10df3d JM |
5130 | /* First the templates. */ |
5131 | if (arg_assoc (k, templ)) | |
5a167978 GDR |
5132 | return true; |
5133 | ||
5134 | /* Now the arguments. */ | |
c19aaba5 NS |
5135 | if (args) |
5136 | for (ix = TREE_VEC_LENGTH (args); ix--;) | |
5137 | if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, ix)) == 1) | |
5138 | return true; | |
5a167978 | 5139 | } |
c1cca8d4 | 5140 | else if (TREE_CODE (n) == OVERLOAD) |
5a167978 | 5141 | { |
b06a1f50 JM |
5142 | for (; n; n = OVL_NEXT (n)) |
5143 | if (arg_assoc_type (k, TREE_TYPE (OVL_CURRENT (n)))) | |
5a167978 GDR |
5144 | return true; |
5145 | } | |
5146 | ||
5147 | return false; | |
5148 | } | |
5149 | ||
5150 | /* Performs Koenig lookup depending on arguments, where fns | |
5151 | are the functions found in normal lookup. */ | |
5152 | ||
5153 | tree | |
f9132eb7 RRC |
5154 | lookup_arg_dependent (tree name, tree fns, VEC(tree,gc) *args, |
5155 | bool include_std) | |
5a167978 GDR |
5156 | { |
5157 | struct arg_lookup k; | |
5a167978 GDR |
5158 | |
5159 | timevar_push (TV_NAME_LOOKUP); | |
d63d5d0c ILT |
5160 | |
5161 | /* Remove any hidden friend functions from the list of functions | |
5162 | found so far. They will be added back by arg_assoc_class as | |
5163 | appropriate. */ | |
5164 | fns = remove_hidden_names (fns); | |
5165 | ||
5a167978 | 5166 | k.name = name; |
d63d5d0c | 5167 | k.args = args; |
5a167978 | 5168 | k.functions = fns; |
bfdb7b70 | 5169 | k.classes = make_tree_vector (); |
5a167978 | 5170 | |
20ac1e03 DG |
5171 | /* We previously performed an optimization here by setting |
5172 | NAMESPACES to the current namespace when it was safe. However, DR | |
5173 | 164 says that namespaces that were already searched in the first | |
5174 | stage of template processing are searched again (potentially | |
5175 | picking up later definitions) in the second stage. */ | |
bfdb7b70 | 5176 | k.namespaces = make_tree_vector (); |
5a167978 | 5177 | |
f9132eb7 RRC |
5178 | if (include_std) |
5179 | arg_assoc_namespace (&k, std_node); | |
c166b898 | 5180 | arg_assoc_args_vec (&k, args); |
4860b874 NS |
5181 | |
5182 | fns = k.functions; | |
5183 | ||
5184 | if (fns | |
5185 | && TREE_CODE (fns) != VAR_DECL | |
5186 | && !is_overloaded_fn (fns)) | |
5187 | { | |
5188 | error ("argument dependent lookup finds %q+D", fns); | |
5189 | error (" in call to %qD", name); | |
5190 | fns = error_mark_node; | |
5191 | } | |
bfdb7b70 NF |
5192 | |
5193 | release_tree_vector (k.classes); | |
5194 | release_tree_vector (k.namespaces); | |
4860b874 NS |
5195 | |
5196 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, fns); | |
5a167978 GDR |
5197 | } |
5198 | ||
00e8de68 GDR |
5199 | /* Add namespace to using_directives. Return NULL_TREE if nothing was |
5200 | changed (i.e. there was already a directive), or the fresh | |
5201 | TREE_LIST otherwise. */ | |
5202 | ||
a5e6b29b | 5203 | static tree |
00e8de68 GDR |
5204 | push_using_directive (tree used) |
5205 | { | |
5206 | tree ud = current_binding_level->using_directives; | |
5207 | tree iter, ancestor; | |
5208 | ||
5209 | timevar_push (TV_NAME_LOOKUP); | |
5210 | /* Check if we already have this. */ | |
5211 | if (purpose_member (used, ud) != NULL_TREE) | |
5212 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
5213 | ||
5214 | ancestor = namespace_ancestor (current_decl_namespace (), used); | |
5215 | ud = current_binding_level->using_directives; | |
5216 | ud = tree_cons (used, ancestor, ud); | |
5217 | current_binding_level->using_directives = ud; | |
5218 | ||
5219 | /* Recursively add all namespaces used. */ | |
5220 | for (iter = DECL_NAMESPACE_USING (used); iter; iter = TREE_CHAIN (iter)) | |
5221 | push_using_directive (TREE_PURPOSE (iter)); | |
5222 | ||
5223 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ud); | |
5224 | } | |
5225 | ||
5226 | /* The type TYPE is being declared. If it is a class template, or a | |
5227 | specialization of a class template, do any processing required and | |
5228 | perform error-checking. If IS_FRIEND is nonzero, this TYPE is | |
5229 | being declared a friend. B is the binding level at which this TYPE | |
5230 | should be bound. | |
5231 | ||
5232 | Returns the TYPE_DECL for TYPE, which may have been altered by this | |
5233 | processing. */ | |
5234 | ||
5235 | static tree | |
bd3d082e | 5236 | maybe_process_template_type_declaration (tree type, int is_friend, |
0cbd7506 | 5237 | cxx_scope *b) |
00e8de68 GDR |
5238 | { |
5239 | tree decl = TYPE_NAME (type); | |
5240 | ||
5241 | if (processing_template_parmlist) | |
5242 | /* You can't declare a new template type in a template parameter | |
5243 | list. But, you can declare a non-template type: | |
5244 | ||
0cbd7506 | 5245 | template <class A*> struct S; |
00e8de68 GDR |
5246 | |
5247 | is a forward-declaration of `A'. */ | |
5248 | ; | |
c43e95f8 MM |
5249 | else if (b->kind == sk_namespace |
5250 | && current_binding_level->kind != sk_namespace) | |
5251 | /* If this new type is being injected into a containing scope, | |
5252 | then it's not a template type. */ | |
5253 | ; | |
00e8de68 GDR |
5254 | else |
5255 | { | |
9e1e64ec PC |
5256 | gcc_assert (MAYBE_CLASS_TYPE_P (type) |
5257 | || TREE_CODE (type) == ENUMERAL_TYPE); | |
00e8de68 GDR |
5258 | |
5259 | if (processing_template_decl) | |
5260 | { | |
5261 | /* This may change after the call to | |
5262 | push_template_decl_real, but we want the original value. */ | |
5263 | tree name = DECL_NAME (decl); | |
5264 | ||
bd3d082e | 5265 | decl = push_template_decl_real (decl, is_friend); |
79faac54 PC |
5266 | if (decl == error_mark_node) |
5267 | return error_mark_node; | |
5268 | ||
00e8de68 GDR |
5269 | /* If the current binding level is the binding level for the |
5270 | template parameters (see the comment in | |
5271 | begin_template_parm_list) and the enclosing level is a class | |
5272 | scope, and we're not looking at a friend, push the | |
5273 | declaration of the member class into the class scope. In the | |
5274 | friend case, push_template_decl will already have put the | |
5275 | friend into global scope, if appropriate. */ | |
5276 | if (TREE_CODE (type) != ENUMERAL_TYPE | |
bd3d082e | 5277 | && !is_friend && b->kind == sk_template_parms |
00e8de68 GDR |
5278 | && b->level_chain->kind == sk_class) |
5279 | { | |
5280 | finish_member_declaration (CLASSTYPE_TI_TEMPLATE (type)); | |
e57df6fe | 5281 | |
00e8de68 GDR |
5282 | if (!COMPLETE_TYPE_P (current_class_type)) |
5283 | { | |
5284 | maybe_add_class_template_decl_list (current_class_type, | |
5285 | type, /*friend_p=*/0); | |
c72a1a86 | 5286 | /* Put this UTD in the table of UTDs for the class. */ |
e57df6fe KL |
5287 | if (CLASSTYPE_NESTED_UTDS (current_class_type) == NULL) |
5288 | CLASSTYPE_NESTED_UTDS (current_class_type) = | |
5289 | binding_table_new (SCOPE_DEFAULT_HT_SIZE); | |
5290 | ||
5291 | binding_table_insert | |
5292 | (CLASSTYPE_NESTED_UTDS (current_class_type), name, type); | |
00e8de68 GDR |
5293 | } |
5294 | } | |
5295 | } | |
5296 | } | |
5297 | ||
5298 | return decl; | |
5299 | } | |
5300 | ||
5a24482e KL |
5301 | /* Push a tag name NAME for struct/class/union/enum type TYPE. In case |
5302 | that the NAME is a class template, the tag is processed but not pushed. | |
5303 | ||
5304 | The pushed scope depend on the SCOPE parameter: | |
5305 | - When SCOPE is TS_CURRENT, put it into the inner-most non-sk_cleanup | |
5306 | scope. | |
5307 | - When SCOPE is TS_GLOBAL, put it in the inner-most non-class and | |
5308 | non-template-parameter scope. This case is needed for forward | |
5309 | declarations. | |
5310 | - When SCOPE is TS_WITHIN_ENCLOSING_NON_CLASS, this is similar to | |
5311 | TS_GLOBAL case except that names within template-parameter scopes | |
5312 | are not pushed at all. | |
5313 | ||
c6f9f83b | 5314 | Returns TYPE upon success and ERROR_MARK_NODE otherwise. */ |
00e8de68 | 5315 | |
c6f9f83b | 5316 | tree |
bd3d082e | 5317 | pushtag (tree name, tree type, tag_scope scope) |
00e8de68 | 5318 | { |
926ce8bd | 5319 | struct cp_binding_level *b; |
6a000704 | 5320 | tree decl; |
00e8de68 GDR |
5321 | |
5322 | timevar_push (TV_NAME_LOOKUP); | |
5323 | b = current_binding_level; | |
7c82a41e MM |
5324 | while (/* Cleanup scopes are not scopes from the point of view of |
5325 | the language. */ | |
5326 | b->kind == sk_cleanup | |
b344d949 JM |
5327 | /* Neither are function parameter scopes. */ |
5328 | || b->kind == sk_function_parms | |
7c82a41e MM |
5329 | /* Neither are the scopes used to hold template parameters |
5330 | for an explicit specialization. For an ordinary template | |
5331 | declaration, these scopes are not scopes from the point of | |
5a24482e KL |
5332 | view of the language. */ |
5333 | || (b->kind == sk_template_parms | |
5334 | && (b->explicit_spec_p || scope == ts_global)) | |
00e8de68 | 5335 | || (b->kind == sk_class |
bd3d082e | 5336 | && (scope != ts_current |
00e8de68 GDR |
5337 | /* We may be defining a new type in the initializer |
5338 | of a static member variable. We allow this when | |
5339 | not pedantic, and it is particularly useful for | |
5340 | type punning via an anonymous union. */ | |
5341 | || COMPLETE_TYPE_P (b->this_entity)))) | |
5342 | b = b->level_chain; | |
5343 | ||
6a000704 | 5344 | gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); |
3db45ab5 | 5345 | |
6a000704 NS |
5346 | /* Do C++ gratuitous typedefing. */ |
5347 | if (IDENTIFIER_TYPE_VALUE (name) != type) | |
00e8de68 | 5348 | { |
6a000704 NS |
5349 | tree tdef; |
5350 | int in_class = 0; | |
5351 | tree context = TYPE_CONTEXT (type); | |
00e8de68 | 5352 | |
6a000704 NS |
5353 | if (! context) |
5354 | { | |
5355 | tree cs = current_scope (); | |
3db45ab5 | 5356 | |
d5f4eddd JM |
5357 | if (scope == ts_current |
5358 | || (cs && TREE_CODE (cs) == FUNCTION_DECL)) | |
6a000704 NS |
5359 | context = cs; |
5360 | else if (cs != NULL_TREE && TYPE_P (cs)) | |
5361 | /* When declaring a friend class of a local class, we want | |
5362 | to inject the newly named class into the scope | |
5363 | containing the local class, not the namespace | |
5364 | scope. */ | |
5365 | context = decl_function_context (get_type_decl (cs)); | |
5366 | } | |
5367 | if (!context) | |
5368 | context = current_namespace; | |
bd3d082e | 5369 | |
6a000704 NS |
5370 | if (b->kind == sk_class |
5371 | || (b->kind == sk_template_parms | |
5372 | && b->level_chain->kind == sk_class)) | |
5373 | in_class = 1; | |
00e8de68 | 5374 | |
6a000704 NS |
5375 | if (current_lang_name == lang_name_java) |
5376 | TYPE_FOR_JAVA (type) = 1; | |
00e8de68 | 5377 | |
6a000704 NS |
5378 | tdef = create_implicit_typedef (name, type); |
5379 | DECL_CONTEXT (tdef) = FROB_CONTEXT (context); | |
5380 | if (scope == ts_within_enclosing_non_class) | |
00e8de68 | 5381 | { |
6a000704 NS |
5382 | /* This is a friend. Make this TYPE_DECL node hidden from |
5383 | ordinary name lookup. Its corresponding TEMPLATE_DECL | |
5384 | will be marked in push_template_decl_real. */ | |
5385 | retrofit_lang_decl (tdef); | |
5386 | DECL_ANTICIPATED (tdef) = 1; | |
5387 | DECL_FRIEND_P (tdef) = 1; | |
5388 | } | |
e57df6fe | 5389 | |
6a000704 NS |
5390 | decl = maybe_process_template_type_declaration |
5391 | (type, scope == ts_within_enclosing_non_class, b); | |
5392 | if (decl == error_mark_node) | |
5393 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
3db45ab5 | 5394 | |
6a000704 NS |
5395 | if (b->kind == sk_class) |
5396 | { | |
0efc4442 DS |
5397 | if (!TYPE_BEING_DEFINED (current_class_type)) |
5398 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
5399 | ||
6a000704 NS |
5400 | if (!PROCESSING_REAL_TEMPLATE_DECL_P ()) |
5401 | /* Put this TYPE_DECL on the TYPE_FIELDS list for the | |
5402 | class. But if it's a member template class, we want | |
5403 | the TEMPLATE_DECL, not the TYPE_DECL, so this is done | |
5404 | later. */ | |
5405 | finish_member_declaration (decl); | |
5406 | else | |
5407 | pushdecl_class_level (decl); | |
00e8de68 | 5408 | } |
6a000704 | 5409 | else if (b->kind != sk_template_parms) |
c5f8391c SE |
5410 | { |
5411 | decl = pushdecl_with_scope (decl, b, /*is_friend=*/false); | |
5412 | if (decl == error_mark_node) | |
5413 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
5414 | } | |
6a000704 | 5415 | |
dc3ca06f SM |
5416 | if (! in_class) |
5417 | set_identifier_type_value_with_scope (name, tdef, b); | |
5418 | ||
6a000704 NS |
5419 | TYPE_CONTEXT (type) = DECL_CONTEXT (decl); |
5420 | ||
5421 | /* If this is a local class, keep track of it. We need this | |
5422 | information for name-mangling, and so that it is possible to | |
5423 | find all function definitions in a translation unit in a | |
5424 | convenient way. (It's otherwise tricky to find a member | |
5425 | function definition it's only pointed to from within a local | |
5426 | class.) */ | |
5427 | if (TYPE_CONTEXT (type) | |
5428 | && TREE_CODE (TYPE_CONTEXT (type)) == FUNCTION_DECL) | |
5429 | VEC_safe_push (tree, gc, local_classes, type); | |
00e8de68 | 5430 | } |
6a000704 NS |
5431 | if (b->kind == sk_class |
5432 | && !COMPLETE_TYPE_P (current_class_type)) | |
00e8de68 | 5433 | { |
6a000704 NS |
5434 | maybe_add_class_template_decl_list (current_class_type, |
5435 | type, /*friend_p=*/0); | |
3db45ab5 | 5436 | |
6a000704 NS |
5437 | if (CLASSTYPE_NESTED_UTDS (current_class_type) == NULL) |
5438 | CLASSTYPE_NESTED_UTDS (current_class_type) | |
5439 | = binding_table_new (SCOPE_DEFAULT_HT_SIZE); | |
3db45ab5 | 5440 | |
6a000704 NS |
5441 | binding_table_insert |
5442 | (CLASSTYPE_NESTED_UTDS (current_class_type), name, type); | |
00e8de68 | 5443 | } |
6a000704 NS |
5444 | |
5445 | decl = TYPE_NAME (type); | |
5446 | gcc_assert (TREE_CODE (decl) == TYPE_DECL); | |
6a000704 | 5447 | |
b9e75696 JM |
5448 | /* Set type visibility now if this is a forward declaration. */ |
5449 | TREE_PUBLIC (decl) = 1; | |
5450 | determine_visibility (decl); | |
5451 | ||
c6f9f83b | 5452 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, type); |
00e8de68 GDR |
5453 | } |
5454 | \f | |
00e8de68 GDR |
5455 | /* Subroutines for reverting temporarily to top-level for instantiation |
5456 | of templates and such. We actually need to clear out the class- and | |
5457 | local-value slots of all identifiers, so that only the global values | |
5458 | are at all visible. Simply setting current_binding_level to the global | |
5459 | scope isn't enough, because more binding levels may be pushed. */ | |
5460 | struct saved_scope *scope_chain; | |
5461 | ||
f44b0c8e MM |
5462 | /* If ID has not already been marked, add an appropriate binding to |
5463 | *OLD_BINDINGS. */ | |
89b578be | 5464 | |
f44b0c8e | 5465 | static void |
d4e6fecb | 5466 | store_binding (tree id, VEC(cxx_saved_binding,gc) **old_bindings) |
89b578be MM |
5467 | { |
5468 | cxx_saved_binding *saved; | |
89b578be | 5469 | |
39fb05d0 | 5470 | if (!id || !IDENTIFIER_BINDING (id)) |
f44b0c8e | 5471 | return; |
89b578be | 5472 | |
f44b0c8e MM |
5473 | if (IDENTIFIER_MARKED (id)) |
5474 | return; | |
c8094d83 | 5475 | |
f44b0c8e | 5476 | IDENTIFIER_MARKED (id) = 1; |
89b578be | 5477 | |
d4e6fecb | 5478 | saved = VEC_safe_push (cxx_saved_binding, gc, *old_bindings, NULL); |
89b578be MM |
5479 | saved->identifier = id; |
5480 | saved->binding = IDENTIFIER_BINDING (id); | |
89b578be MM |
5481 | saved->real_type_value = REAL_IDENTIFIER_TYPE_VALUE (id); |
5482 | IDENTIFIER_BINDING (id) = NULL; | |
89b578be MM |
5483 | } |
5484 | ||
f44b0c8e | 5485 | static void |
d4e6fecb | 5486 | store_bindings (tree names, VEC(cxx_saved_binding,gc) **old_bindings) |
00e8de68 GDR |
5487 | { |
5488 | tree t; | |
00e8de68 GDR |
5489 | |
5490 | timevar_push (TV_NAME_LOOKUP); | |
5491 | for (t = names; t; t = TREE_CHAIN (t)) | |
5492 | { | |
5493 | tree id; | |
00e8de68 GDR |
5494 | |
5495 | if (TREE_CODE (t) == TREE_LIST) | |
5496 | id = TREE_PURPOSE (t); | |
5497 | else | |
5498 | id = DECL_NAME (t); | |
5499 | ||
f44b0c8e | 5500 | store_binding (id, old_bindings); |
00e8de68 | 5501 | } |
f44b0c8e | 5502 | timevar_pop (TV_NAME_LOOKUP); |
00e8de68 GDR |
5503 | } |
5504 | ||
89b578be MM |
5505 | /* Like store_bindings, but NAMES is a vector of cp_class_binding |
5506 | objects, rather than a TREE_LIST. */ | |
5507 | ||
f44b0c8e | 5508 | static void |
c8094d83 | 5509 | store_class_bindings (VEC(cp_class_binding,gc) *names, |
d4e6fecb | 5510 | VEC(cxx_saved_binding,gc) **old_bindings) |
89b578be MM |
5511 | { |
5512 | size_t i; | |
5513 | cp_class_binding *cb; | |
89b578be MM |
5514 | |
5515 | timevar_push (TV_NAME_LOOKUP); | |
9ba5ff0f | 5516 | for (i = 0; VEC_iterate(cp_class_binding, names, i, cb); ++i) |
f44b0c8e MM |
5517 | store_binding (cb->identifier, old_bindings); |
5518 | timevar_pop (TV_NAME_LOOKUP); | |
89b578be MM |
5519 | } |
5520 | ||
00e8de68 | 5521 | void |
c353b8e3 | 5522 | push_to_top_level (void) |
00e8de68 GDR |
5523 | { |
5524 | struct saved_scope *s; | |
5525 | struct cp_binding_level *b; | |
f44b0c8e MM |
5526 | cxx_saved_binding *sb; |
5527 | size_t i; | |
30bcc028 | 5528 | bool need_pop; |
00e8de68 GDR |
5529 | |
5530 | timevar_push (TV_NAME_LOOKUP); | |
a9429e29 | 5531 | s = ggc_alloc_cleared_saved_scope (); |
00e8de68 GDR |
5532 | |
5533 | b = scope_chain ? current_binding_level : 0; | |
5534 | ||
5535 | /* If we're in the middle of some function, save our state. */ | |
5536 | if (cfun) | |
5537 | { | |
30bcc028 | 5538 | need_pop = true; |
d2784db4 | 5539 | push_function_context (); |
00e8de68 GDR |
5540 | } |
5541 | else | |
30bcc028 | 5542 | need_pop = false; |
00e8de68 | 5543 | |
89b578be | 5544 | if (scope_chain && previous_class_level) |
f44b0c8e MM |
5545 | store_class_bindings (previous_class_level->class_shadowed, |
5546 | &s->old_bindings); | |
00e8de68 GDR |
5547 | |
5548 | /* Have to include the global scope, because class-scope decls | |
5549 | aren't listed anywhere useful. */ | |
5550 | for (; b; b = b->level_chain) | |
5551 | { | |
5552 | tree t; | |
5553 | ||
5554 | /* Template IDs are inserted into the global level. If they were | |
5555 | inserted into namespace level, finish_file wouldn't find them | |
5556 | when doing pending instantiations. Therefore, don't stop at | |
5557 | namespace level, but continue until :: . */ | |
c353b8e3 | 5558 | if (global_scope_p (b)) |
00e8de68 GDR |
5559 | break; |
5560 | ||
f44b0c8e | 5561 | store_bindings (b->names, &s->old_bindings); |
00e8de68 GDR |
5562 | /* We also need to check class_shadowed to save class-level type |
5563 | bindings, since pushclass doesn't fill in b->names. */ | |
5564 | if (b->kind == sk_class) | |
f44b0c8e | 5565 | store_class_bindings (b->class_shadowed, &s->old_bindings); |
00e8de68 GDR |
5566 | |
5567 | /* Unwind type-value slots back to top level. */ | |
5568 | for (t = b->type_shadowed; t; t = TREE_CHAIN (t)) | |
5569 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (t), TREE_VALUE (t)); | |
5570 | } | |
f44b0c8e | 5571 | |
ac47786e | 5572 | FOR_EACH_VEC_ELT (cxx_saved_binding, s->old_bindings, i, sb) |
f44b0c8e MM |
5573 | IDENTIFIER_MARKED (sb->identifier) = 0; |
5574 | ||
00e8de68 | 5575 | s->prev = scope_chain; |
00e8de68 GDR |
5576 | s->bindings = b; |
5577 | s->need_pop_function_context = need_pop; | |
5578 | s->function_decl = current_function_decl; | |
7d882b83 ILT |
5579 | s->unevaluated_operand = cp_unevaluated_operand; |
5580 | s->inhibit_evaluation_warnings = c_inhibit_evaluation_warnings; | |
00e8de68 GDR |
5581 | |
5582 | scope_chain = s; | |
5583 | current_function_decl = NULL_TREE; | |
aff44741 | 5584 | current_lang_base = VEC_alloc (tree, gc, 10); |
00e8de68 GDR |
5585 | current_lang_name = lang_name_cplusplus; |
5586 | current_namespace = global_namespace; | |
c888c93b | 5587 | push_class_stack (); |
7d882b83 ILT |
5588 | cp_unevaluated_operand = 0; |
5589 | c_inhibit_evaluation_warnings = 0; | |
00e8de68 GDR |
5590 | timevar_pop (TV_NAME_LOOKUP); |
5591 | } | |
5592 | ||
00e8de68 GDR |
5593 | void |
5594 | pop_from_top_level (void) | |
5595 | { | |
5596 | struct saved_scope *s = scope_chain; | |
5597 | cxx_saved_binding *saved; | |
f44b0c8e | 5598 | size_t i; |
00e8de68 | 5599 | |
c8094d83 | 5600 | timevar_push (TV_NAME_LOOKUP); |
00e8de68 | 5601 | /* Clear out class-level bindings cache. */ |
89b578be | 5602 | if (previous_class_level) |
00e8de68 | 5603 | invalidate_class_lookup_cache (); |
c888c93b | 5604 | pop_class_stack (); |
00e8de68 GDR |
5605 | |
5606 | current_lang_base = 0; | |
5607 | ||
5608 | scope_chain = s->prev; | |
ac47786e | 5609 | FOR_EACH_VEC_ELT (cxx_saved_binding, s->old_bindings, i, saved) |
00e8de68 GDR |
5610 | { |
5611 | tree id = saved->identifier; | |
5612 | ||
5613 | IDENTIFIER_BINDING (id) = saved->binding; | |
00e8de68 GDR |
5614 | SET_IDENTIFIER_TYPE_VALUE (id, saved->real_type_value); |
5615 | } | |
5616 | ||
5617 | /* If we were in the middle of compiling a function, restore our | |
5618 | state. */ | |
5619 | if (s->need_pop_function_context) | |
d2784db4 | 5620 | pop_function_context (); |
00e8de68 | 5621 | current_function_decl = s->function_decl; |
7d882b83 ILT |
5622 | cp_unevaluated_operand = s->unevaluated_operand; |
5623 | c_inhibit_evaluation_warnings = s->inhibit_evaluation_warnings; | |
00e8de68 GDR |
5624 | timevar_pop (TV_NAME_LOOKUP); |
5625 | } | |
5626 | ||
5627 | /* Pop off extraneous binding levels left over due to syntax errors. | |
5628 | ||
5629 | We don't pop past namespaces, as they might be valid. */ | |
5630 | ||
5631 | void | |
5632 | pop_everything (void) | |
5633 | { | |
5634 | if (ENABLE_SCOPE_CHECKING) | |
5635 | verbatim ("XXX entering pop_everything ()\n"); | |
5636 | while (!toplevel_bindings_p ()) | |
5637 | { | |
5638 | if (current_binding_level->kind == sk_class) | |
5639 | pop_nested_class (); | |
5640 | else | |
5641 | poplevel (0, 0, 0); | |
5642 | } | |
5643 | if (ENABLE_SCOPE_CHECKING) | |
5644 | verbatim ("XXX leaving pop_everything ()\n"); | |
5645 | } | |
5646 | ||
6097b0c3 | 5647 | /* Emit debugging information for using declarations and directives. |
c8094d83 | 5648 | If input tree is overloaded fn then emit debug info for all |
6097b0c3 DP |
5649 | candidates. */ |
5650 | ||
98ed9dae | 5651 | void |
6097b0c3 DP |
5652 | cp_emit_debug_info_for_using (tree t, tree context) |
5653 | { | |
099f36ab | 5654 | /* Don't try to emit any debug information if we have errors. */ |
1da2ed5f | 5655 | if (seen_error ()) |
099f36ab JM |
5656 | return; |
5657 | ||
c8094d83 | 5658 | /* Ignore this FUNCTION_DECL if it refers to a builtin declaration |
6097b0c3 | 5659 | of a builtin function. */ |
c8094d83 | 5660 | if (TREE_CODE (t) == FUNCTION_DECL |
6097b0c3 DP |
5661 | && DECL_EXTERNAL (t) |
5662 | && DECL_BUILT_IN (t)) | |
5663 | return; | |
5664 | ||
5665 | /* Do not supply context to imported_module_or_decl, if | |
5666 | it is a global namespace. */ | |
5667 | if (context == global_namespace) | |
5668 | context = NULL_TREE; | |
c8094d83 | 5669 | |
6097b0c3 DP |
5670 | if (BASELINK_P (t)) |
5671 | t = BASELINK_FUNCTIONS (t); | |
c8094d83 | 5672 | |
6097b0c3 DP |
5673 | /* FIXME: Handle TEMPLATE_DECLs. */ |
5674 | for (t = OVL_CURRENT (t); t; t = OVL_NEXT (t)) | |
5675 | if (TREE_CODE (t) != TEMPLATE_DECL) | |
98381eb4 JJ |
5676 | { |
5677 | if (building_stmt_tree ()) | |
c2255bc4 | 5678 | add_stmt (build_stmt (input_location, USING_STMT, t)); |
98381eb4 JJ |
5679 | else |
5680 | (*debug_hooks->imported_module_or_decl) (t, NULL_TREE, context, false); | |
5681 | } | |
98ed9dae | 5682 | } |
6097b0c3 | 5683 | |
28ea4c88 | 5684 | #include "gt-cp-name-lookup.h" |