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aed81407 | 1 | /* Definitions for C++ name lookup routines. |
66647d44 | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
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" |
c87ceb13 | 31 | #include "toplev.h" |
00e8de68 | 32 | #include "diagnostic.h" |
6097b0c3 | 33 | #include "debug.h" |
0ed5edac | 34 | #include "c-pragma.h" |
00e8de68 | 35 | |
15f8ac7f GK |
36 | /* The bindings for a particular name in a particular scope. */ |
37 | ||
38 | struct scope_binding { | |
39 | tree value; | |
40 | tree type; | |
41 | }; | |
42 | #define EMPTY_SCOPE_BINDING { NULL_TREE, NULL_TREE } | |
43 | ||
00e8de68 | 44 | static cxx_scope *innermost_nonclass_level (void); |
5a167978 | 45 | static cxx_binding *binding_for_name (cxx_scope *, tree); |
d63d5d0c | 46 | static tree push_overloaded_decl (tree, int, bool); |
15f8ac7f | 47 | static bool lookup_using_namespace (tree, struct scope_binding *, tree, |
0cbd7506 | 48 | tree, int); |
15f8ac7f GK |
49 | static bool qualified_lookup_using_namespace (tree, tree, |
50 | struct scope_binding *, int); | |
a5e6b29b GDR |
51 | static tree lookup_type_current_level (tree); |
52 | static tree push_using_directive (tree); | |
ecba6c56 | 53 | static cxx_binding* lookup_extern_c_fun_binding_in_all_ns (tree); |
5a167978 GDR |
54 | |
55 | /* The :: namespace. */ | |
56 | ||
57 | tree global_namespace; | |
00e8de68 | 58 | |
ed36980c JM |
59 | /* The name of the anonymous namespace, throughout this translation |
60 | unit. */ | |
aa26a3f6 | 61 | static GTY(()) tree anonymous_namespace_name; |
ed36980c | 62 | |
811895d5 | 63 | /* Initialize anonymous_namespace_name if necessary, and return it. */ |
5880f14f GK |
64 | |
65 | static tree | |
66 | get_anonymous_namespace_name(void) | |
67 | { | |
68 | if (!anonymous_namespace_name) | |
69 | { | |
70 | /* The anonymous namespace has to have a unique name | |
71 | if typeinfo objects are being compared by name. */ | |
72 | if (! flag_weak || ! SUPPORTS_ONE_ONLY) | |
73 | anonymous_namespace_name = get_file_function_name ("N"); | |
74 | else | |
75 | /* The demangler expects anonymous namespaces to be called | |
76 | something starting with '_GLOBAL__N_'. */ | |
77 | anonymous_namespace_name = get_identifier ("_GLOBAL__N_1"); | |
78 | } | |
79 | return anonymous_namespace_name; | |
80 | } | |
aed81407 | 81 | |
5e0c54e5 GDR |
82 | /* Compute the chain index of a binding_entry given the HASH value of its |
83 | name and the total COUNT of chains. COUNT is assumed to be a power | |
84 | of 2. */ | |
daafa301 | 85 | |
5e0c54e5 GDR |
86 | #define ENTRY_INDEX(HASH, COUNT) (((HASH) >> 3) & ((COUNT) - 1)) |
87 | ||
88 | /* A free list of "binding_entry"s awaiting for re-use. */ | |
daafa301 | 89 | |
1431042e | 90 | static GTY((deletable)) binding_entry free_binding_entry = NULL; |
5e0c54e5 GDR |
91 | |
92 | /* Create a binding_entry object for (NAME, TYPE). */ | |
daafa301 | 93 | |
5e0c54e5 GDR |
94 | static inline binding_entry |
95 | binding_entry_make (tree name, tree type) | |
96 | { | |
97 | binding_entry entry; | |
98 | ||
99 | if (free_binding_entry) | |
100 | { | |
101 | entry = free_binding_entry; | |
102 | free_binding_entry = entry->chain; | |
103 | } | |
104 | else | |
99dd239f | 105 | entry = GGC_NEW (struct binding_entry_s); |
5e0c54e5 GDR |
106 | |
107 | entry->name = name; | |
108 | entry->type = type; | |
7e8f3096 | 109 | entry->chain = NULL; |
5e0c54e5 GDR |
110 | |
111 | return entry; | |
112 | } | |
113 | ||
114 | /* Put ENTRY back on the free list. */ | |
e57df6fe | 115 | #if 0 |
5e0c54e5 GDR |
116 | static inline void |
117 | binding_entry_free (binding_entry entry) | |
118 | { | |
04693f2f GDR |
119 | entry->name = NULL; |
120 | entry->type = NULL; | |
5e0c54e5 GDR |
121 | entry->chain = free_binding_entry; |
122 | free_binding_entry = entry; | |
123 | } | |
e57df6fe | 124 | #endif |
5e0c54e5 GDR |
125 | |
126 | /* The datatype used to implement the mapping from names to types at | |
127 | a given scope. */ | |
d1b38208 | 128 | struct GTY(()) binding_table_s { |
5e0c54e5 GDR |
129 | /* Array of chains of "binding_entry"s */ |
130 | binding_entry * GTY((length ("%h.chain_count"))) chain; | |
131 | ||
132 | /* The number of chains in this table. This is the length of the | |
39a13be5 | 133 | member "chain" considered as an array. */ |
5e0c54e5 GDR |
134 | size_t chain_count; |
135 | ||
136 | /* Number of "binding_entry"s in this table. */ | |
137 | size_t entry_count; | |
138 | }; | |
139 | ||
140 | /* Construct TABLE with an initial CHAIN_COUNT. */ | |
daafa301 | 141 | |
5e0c54e5 GDR |
142 | static inline void |
143 | binding_table_construct (binding_table table, size_t chain_count) | |
144 | { | |
145 | table->chain_count = chain_count; | |
146 | table->entry_count = 0; | |
99dd239f | 147 | table->chain = GGC_CNEWVEC (binding_entry, table->chain_count); |
5e0c54e5 GDR |
148 | } |
149 | ||
daafa301 | 150 | /* Make TABLE's entries ready for reuse. */ |
e57df6fe | 151 | #if 0 |
00e8de68 | 152 | static void |
5e0c54e5 GDR |
153 | binding_table_free (binding_table table) |
154 | { | |
155 | size_t i; | |
daafa301 GDR |
156 | size_t count; |
157 | ||
5e0c54e5 GDR |
158 | if (table == NULL) |
159 | return; | |
160 | ||
daafa301 | 161 | for (i = 0, count = table->chain_count; i < count; ++i) |
5e0c54e5 | 162 | { |
7e8f3096 AP |
163 | binding_entry temp = table->chain[i]; |
164 | while (temp != NULL) | |
0cbd7506 MS |
165 | { |
166 | binding_entry entry = temp; | |
167 | temp = entry->chain; | |
168 | binding_entry_free (entry); | |
169 | } | |
daafa301 | 170 | table->chain[i] = NULL; |
5e0c54e5 GDR |
171 | } |
172 | table->entry_count = 0; | |
173 | } | |
e57df6fe | 174 | #endif |
5e0c54e5 GDR |
175 | |
176 | /* Allocate a table with CHAIN_COUNT, assumed to be a power of two. */ | |
daafa301 | 177 | |
00e8de68 | 178 | static inline binding_table |
5e0c54e5 GDR |
179 | binding_table_new (size_t chain_count) |
180 | { | |
99dd239f | 181 | binding_table table = GGC_NEW (struct binding_table_s); |
7e8f3096 | 182 | table->chain = NULL; |
5e0c54e5 GDR |
183 | binding_table_construct (table, chain_count); |
184 | return table; | |
185 | } | |
186 | ||
187 | /* Expand TABLE to twice its current chain_count. */ | |
daafa301 | 188 | |
5e0c54e5 GDR |
189 | static void |
190 | binding_table_expand (binding_table table) | |
191 | { | |
192 | const size_t old_chain_count = table->chain_count; | |
193 | const size_t old_entry_count = table->entry_count; | |
194 | const size_t new_chain_count = 2 * old_chain_count; | |
195 | binding_entry *old_chains = table->chain; | |
196 | size_t i; | |
197 | ||
198 | binding_table_construct (table, new_chain_count); | |
199 | for (i = 0; i < old_chain_count; ++i) | |
200 | { | |
201 | binding_entry entry = old_chains[i]; | |
202 | for (; entry != NULL; entry = old_chains[i]) | |
0cbd7506 MS |
203 | { |
204 | const unsigned int hash = IDENTIFIER_HASH_VALUE (entry->name); | |
205 | const size_t j = ENTRY_INDEX (hash, new_chain_count); | |
206 | ||
207 | old_chains[i] = entry->chain; | |
208 | entry->chain = table->chain[j]; | |
209 | table->chain[j] = entry; | |
210 | } | |
5e0c54e5 GDR |
211 | } |
212 | table->entry_count = old_entry_count; | |
213 | } | |
214 | ||
daafa301 GDR |
215 | /* Insert a binding for NAME to TYPE into TABLE. */ |
216 | ||
00e8de68 | 217 | static void |
5e0c54e5 GDR |
218 | binding_table_insert (binding_table table, tree name, tree type) |
219 | { | |
220 | const unsigned int hash = IDENTIFIER_HASH_VALUE (name); | |
221 | const size_t i = ENTRY_INDEX (hash, table->chain_count); | |
222 | binding_entry entry = binding_entry_make (name, type); | |
223 | ||
224 | entry->chain = table->chain[i]; | |
225 | table->chain[i] = entry; | |
226 | ++table->entry_count; | |
227 | ||
228 | if (3 * table->chain_count < 5 * table->entry_count) | |
229 | binding_table_expand (table); | |
230 | } | |
231 | ||
232 | /* Return the binding_entry, if any, that maps NAME. */ | |
daafa301 | 233 | |
5e0c54e5 GDR |
234 | binding_entry |
235 | binding_table_find (binding_table table, tree name) | |
236 | { | |
237 | const unsigned int hash = IDENTIFIER_HASH_VALUE (name); | |
238 | binding_entry entry = table->chain[ENTRY_INDEX (hash, table->chain_count)]; | |
239 | ||
240 | while (entry != NULL && entry->name != name) | |
241 | entry = entry->chain; | |
242 | ||
243 | return entry; | |
244 | } | |
245 | ||
5e0c54e5 | 246 | /* Apply PROC -- with DATA -- to all entries in TABLE. */ |
daafa301 | 247 | |
5e0c54e5 GDR |
248 | void |
249 | binding_table_foreach (binding_table table, bt_foreach_proc proc, void *data) | |
250 | { | |
251 | const size_t chain_count = table->chain_count; | |
252 | size_t i; | |
253 | ||
254 | for (i = 0; i < chain_count; ++i) | |
255 | { | |
256 | binding_entry entry = table->chain[i]; | |
257 | for (; entry != NULL; entry = entry->chain) | |
0cbd7506 | 258 | proc (entry, data); |
5e0c54e5 GDR |
259 | } |
260 | } | |
261 | \f | |
00e8de68 GDR |
262 | #ifndef ENABLE_SCOPE_CHECKING |
263 | # define ENABLE_SCOPE_CHECKING 0 | |
264 | #else | |
265 | # define ENABLE_SCOPE_CHECKING 1 | |
266 | #endif | |
5e0c54e5 | 267 | |
aed81407 | 268 | /* A free list of "cxx_binding"s, connected by their PREVIOUS. */ |
daafa301 | 269 | |
1431042e | 270 | static GTY((deletable)) cxx_binding *free_bindings; |
aed81407 | 271 | |
89b578be MM |
272 | /* Initialize VALUE and TYPE field for BINDING, and set the PREVIOUS |
273 | field to NULL. */ | |
274 | ||
275 | static inline void | |
276 | cxx_binding_init (cxx_binding *binding, tree value, tree type) | |
277 | { | |
278 | binding->value = value; | |
279 | binding->type = type; | |
280 | binding->previous = NULL; | |
281 | } | |
282 | ||
aed81407 | 283 | /* (GC)-allocate a binding object with VALUE and TYPE member initialized. */ |
daafa301 | 284 | |
00e8de68 | 285 | static cxx_binding * |
aed81407 GDR |
286 | cxx_binding_make (tree value, tree type) |
287 | { | |
288 | cxx_binding *binding; | |
289 | if (free_bindings) | |
290 | { | |
291 | binding = free_bindings; | |
292 | free_bindings = binding->previous; | |
293 | } | |
294 | else | |
99dd239f | 295 | binding = GGC_NEW (cxx_binding); |
aed81407 | 296 | |
89b578be | 297 | cxx_binding_init (binding, value, type); |
aed81407 GDR |
298 | |
299 | return binding; | |
300 | } | |
301 | ||
302 | /* Put BINDING back on the free list. */ | |
daafa301 | 303 | |
00e8de68 | 304 | static inline void |
aed81407 GDR |
305 | cxx_binding_free (cxx_binding *binding) |
306 | { | |
daafa301 | 307 | binding->scope = NULL; |
aed81407 GDR |
308 | binding->previous = free_bindings; |
309 | free_bindings = binding; | |
310 | } | |
c87ceb13 | 311 | |
90ea9897 MM |
312 | /* Create a new binding for NAME (with the indicated VALUE and TYPE |
313 | bindings) in the class scope indicated by SCOPE. */ | |
00e8de68 | 314 | |
90ea9897 MM |
315 | static cxx_binding * |
316 | new_class_binding (tree name, tree value, tree type, cxx_scope *scope) | |
00e8de68 | 317 | { |
90ea9897 | 318 | cp_class_binding *cb; |
89b578be | 319 | cxx_binding *binding; |
c8094d83 | 320 | |
90ea9897 | 321 | if (VEC_length (cp_class_binding, scope->class_shadowed)) |
89b578be | 322 | { |
90ea9897 MM |
323 | cp_class_binding *old_base; |
324 | old_base = VEC_index (cp_class_binding, scope->class_shadowed, 0); | |
d4e6fecb | 325 | if (VEC_reserve (cp_class_binding, gc, scope->class_shadowed, 1)) |
7de5bccc NS |
326 | { |
327 | /* Fixup the current bindings, as they might have moved. */ | |
328 | size_t i; | |
c8094d83 | 329 | |
7de5bccc | 330 | for (i = 0; |
9ba5ff0f | 331 | VEC_iterate (cp_class_binding, scope->class_shadowed, i, cb); |
7de5bccc | 332 | i++) |
90ea9897 MM |
333 | { |
334 | cxx_binding **b; | |
335 | b = &IDENTIFIER_BINDING (cb->identifier); | |
336 | while (*b != &old_base[i].base) | |
337 | b = &((*b)->previous); | |
338 | *b = &cb->base; | |
339 | } | |
7de5bccc | 340 | } |
90ea9897 MM |
341 | cb = VEC_quick_push (cp_class_binding, scope->class_shadowed, NULL); |
342 | } | |
343 | else | |
d4e6fecb | 344 | cb = VEC_safe_push (cp_class_binding, gc, scope->class_shadowed, NULL); |
c8094d83 | 345 | |
90ea9897 MM |
346 | cb->identifier = name; |
347 | binding = &cb->base; | |
348 | binding->scope = scope; | |
349 | cxx_binding_init (binding, value, type); | |
350 | return binding; | |
351 | } | |
352 | ||
353 | /* Make DECL the innermost binding for ID. The LEVEL is the binding | |
354 | level at which this declaration is being bound. */ | |
355 | ||
356 | static void | |
357 | push_binding (tree id, tree decl, cxx_scope* level) | |
358 | { | |
359 | cxx_binding *binding; | |
7de5bccc | 360 | |
90ea9897 MM |
361 | if (level != class_binding_level) |
362 | { | |
363 | binding = cxx_binding_make (decl, NULL_TREE); | |
364 | binding->scope = level; | |
89b578be | 365 | } |
90ea9897 MM |
366 | else |
367 | binding = new_class_binding (id, decl, /*type=*/NULL_TREE, level); | |
c8094d83 | 368 | |
00e8de68 GDR |
369 | /* Now, fill in the binding information. */ |
370 | binding->previous = IDENTIFIER_BINDING (id); | |
00e8de68 GDR |
371 | INHERITED_VALUE_BINDING_P (binding) = 0; |
372 | LOCAL_BINDING_P (binding) = (level != class_binding_level); | |
373 | ||
374 | /* And put it on the front of the list of bindings for ID. */ | |
375 | IDENTIFIER_BINDING (id) = binding; | |
376 | } | |
377 | ||
378 | /* Remove the binding for DECL which should be the innermost binding | |
379 | for ID. */ | |
380 | ||
381 | void | |
382 | pop_binding (tree id, tree decl) | |
383 | { | |
384 | cxx_binding *binding; | |
385 | ||
386 | if (id == NULL_TREE) | |
387 | /* It's easiest to write the loops that call this function without | |
388 | checking whether or not the entities involved have names. We | |
389 | get here for such an entity. */ | |
390 | return; | |
391 | ||
392 | /* Get the innermost binding for ID. */ | |
393 | binding = IDENTIFIER_BINDING (id); | |
394 | ||
395 | /* The name should be bound. */ | |
50bc768d | 396 | gcc_assert (binding != NULL); |
00e8de68 GDR |
397 | |
398 | /* The DECL will be either the ordinary binding or the type | |
399 | binding for this identifier. Remove that binding. */ | |
400 | if (binding->value == decl) | |
401 | binding->value = NULL_TREE; | |
00e8de68 | 402 | else |
315fb5db NS |
403 | { |
404 | gcc_assert (binding->type == decl); | |
405 | binding->type = NULL_TREE; | |
406 | } | |
00e8de68 GDR |
407 | |
408 | if (!binding->value && !binding->type) | |
409 | { | |
410 | /* We're completely done with the innermost binding for this | |
411 | identifier. Unhook it from the list of bindings. */ | |
412 | IDENTIFIER_BINDING (id) = binding->previous; | |
413 | ||
414 | /* Add it to the free list. */ | |
415 | cxx_binding_free (binding); | |
416 | } | |
417 | } | |
418 | ||
c72a1a86 | 419 | /* BINDING records an existing declaration for a name in the current scope. |
c87ceb13 GDR |
420 | But, DECL is another declaration for that same identifier in the |
421 | same scope. This is the `struct stat' hack whereby a non-typedef | |
422 | class name or enum-name can be bound at the same level as some other | |
423 | kind of entity. | |
424 | 3.3.7/1 | |
425 | ||
426 | A class name (9.1) or enumeration name (7.2) can be hidden by the | |
427 | name of an object, function, or enumerator declared in the same scope. | |
428 | If a class or enumeration name and an object, function, or enumerator | |
429 | are declared in the same scope (in any order) with the same name, the | |
430 | class or enumeration name is hidden wherever the object, function, or | |
431 | enumerator name is visible. | |
432 | ||
433 | It's the responsibility of the caller to check that | |
434 | inserting this name is valid here. Returns nonzero if the new binding | |
435 | was successful. */ | |
436 | ||
00e8de68 | 437 | static bool |
c87ceb13 GDR |
438 | supplement_binding (cxx_binding *binding, tree decl) |
439 | { | |
440 | tree bval = binding->value; | |
441 | bool ok = true; | |
442 | ||
443 | timevar_push (TV_NAME_LOOKUP); | |
444 | if (TREE_CODE (decl) == TYPE_DECL && DECL_ARTIFICIAL (decl)) | |
445 | /* The new name is the type name. */ | |
446 | binding->type = decl; | |
62d99768 MM |
447 | else if (/* BVAL is null when push_class_level_binding moves an |
448 | inherited type-binding out of the way to make room for a | |
449 | new value binding. */ | |
c8094d83 | 450 | !bval |
62d99768 MM |
451 | /* BVAL is error_mark_node when DECL's name has been used |
452 | in a non-class scope prior declaration. In that case, | |
453 | we should have already issued a diagnostic; for graceful | |
454 | error recovery purpose, pretend this was the intended | |
455 | declaration for that name. */ | |
456 | || bval == error_mark_node | |
d63d5d0c | 457 | /* If BVAL is anticipated but has not yet been declared, |
62d99768 MM |
458 | pretend it is not there at all. */ |
459 | || (TREE_CODE (bval) == FUNCTION_DECL | |
d63d5d0c ILT |
460 | && DECL_ANTICIPATED (bval) |
461 | && !DECL_HIDDEN_FRIEND_P (bval))) | |
c87ceb13 GDR |
462 | binding->value = decl; |
463 | else if (TREE_CODE (bval) == TYPE_DECL && DECL_ARTIFICIAL (bval)) | |
464 | { | |
465 | /* The old binding was a type name. It was placed in | |
147135cc | 466 | VALUE field because it was thought, at the point it was |
c87ceb13 GDR |
467 | declared, to be the only entity with such a name. Move the |
468 | type name into the type slot; it is now hidden by the new | |
469 | binding. */ | |
470 | binding->type = bval; | |
471 | binding->value = decl; | |
472 | binding->value_is_inherited = false; | |
473 | } | |
474 | else if (TREE_CODE (bval) == TYPE_DECL | |
475 | && TREE_CODE (decl) == TYPE_DECL | |
476 | && DECL_NAME (decl) == DECL_NAME (bval) | |
9306cccb | 477 | && binding->scope->kind != sk_class |
c87ceb13 GDR |
478 | && (same_type_p (TREE_TYPE (decl), TREE_TYPE (bval)) |
479 | /* If either type involves template parameters, we must | |
480 | wait until instantiation. */ | |
481 | || uses_template_parms (TREE_TYPE (decl)) | |
482 | || uses_template_parms (TREE_TYPE (bval)))) | |
483 | /* We have two typedef-names, both naming the same type to have | |
9306cccb | 484 | the same name. In general, this is OK because of: |
c87ceb13 | 485 | |
0cbd7506 | 486 | [dcl.typedef] |
c87ceb13 GDR |
487 | |
488 | In a given scope, a typedef specifier can be used to redefine | |
489 | the name of any type declared in that scope to refer to the | |
c8094d83 | 490 | type to which it already refers. |
9306cccb MM |
491 | |
492 | However, in class scopes, this rule does not apply due to the | |
493 | stricter language in [class.mem] prohibiting redeclarations of | |
494 | members. */ | |
c87ceb13 GDR |
495 | ok = false; |
496 | /* There can be two block-scope declarations of the same variable, | |
497 | so long as they are `extern' declarations. However, there cannot | |
498 | be two declarations of the same static data member: | |
499 | ||
500 | [class.mem] | |
501 | ||
502 | A member shall not be declared twice in the | |
503 | member-specification. */ | |
504 | else if (TREE_CODE (decl) == VAR_DECL && TREE_CODE (bval) == VAR_DECL | |
505 | && DECL_EXTERNAL (decl) && DECL_EXTERNAL (bval) | |
506 | && !DECL_CLASS_SCOPE_P (decl)) | |
507 | { | |
d63d5d0c | 508 | duplicate_decls (decl, binding->value, /*newdecl_is_friend=*/false); |
c87ceb13 GDR |
509 | ok = false; |
510 | } | |
f746161e MM |
511 | else if (TREE_CODE (decl) == NAMESPACE_DECL |
512 | && TREE_CODE (bval) == NAMESPACE_DECL | |
513 | && DECL_NAMESPACE_ALIAS (decl) | |
514 | && DECL_NAMESPACE_ALIAS (bval) | |
515 | && ORIGINAL_NAMESPACE (bval) == ORIGINAL_NAMESPACE (decl)) | |
516 | /* [namespace.alias] | |
c8094d83 | 517 | |
f746161e MM |
518 | In a declarative region, a namespace-alias-definition can be |
519 | used to redefine a namespace-alias declared in that declarative | |
520 | region to refer only to the namespace to which it already | |
521 | refers. */ | |
522 | ok = false; | |
c87ceb13 GDR |
523 | else |
524 | { | |
2a13a625 | 525 | error ("declaration of %q#D", decl); |
dee15844 | 526 | error ("conflicts with previous declaration %q+#D", bval); |
c87ceb13 GDR |
527 | ok = false; |
528 | } | |
529 | ||
530 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ok); | |
531 | } | |
00e8de68 GDR |
532 | |
533 | /* Add DECL to the list of things declared in B. */ | |
534 | ||
a5e6b29b | 535 | static void |
00e8de68 GDR |
536 | add_decl_to_level (tree decl, cxx_scope *b) |
537 | { | |
89bd2c03 OW |
538 | /* We used to record virtual tables as if they were ordinary |
539 | variables, but no longer do so. */ | |
540 | gcc_assert (!(TREE_CODE (decl) == VAR_DECL && DECL_VIRTUAL_P (decl))); | |
541 | ||
c8094d83 | 542 | if (TREE_CODE (decl) == NAMESPACE_DECL |
00e8de68 GDR |
543 | && !DECL_NAMESPACE_ALIAS (decl)) |
544 | { | |
545 | TREE_CHAIN (decl) = b->namespaces; | |
546 | b->namespaces = decl; | |
547 | } | |
c8094d83 | 548 | else |
00e8de68 GDR |
549 | { |
550 | /* We build up the list in reverse order, and reverse it later if | |
0cbd7506 | 551 | necessary. */ |
00e8de68 GDR |
552 | TREE_CHAIN (decl) = b->names; |
553 | b->names = decl; | |
554 | b->names_size++; | |
555 | ||
97b6d55b | 556 | /* If appropriate, add decl to separate list of statics. We |
c8094d83 | 557 | include extern variables because they might turn out to be |
97b6d55b | 558 | static later. It's OK for this list to contain a few false |
324f9dfb | 559 | positives. */ |
00e8de68 | 560 | if (b->kind == sk_namespace) |
97b6d55b MA |
561 | if ((TREE_CODE (decl) == VAR_DECL |
562 | && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))) | |
00e8de68 GDR |
563 | || (TREE_CODE (decl) == FUNCTION_DECL |
564 | && (!TREE_PUBLIC (decl) || DECL_DECLARED_INLINE_P (decl)))) | |
9857866d | 565 | VEC_safe_push (tree, gc, b->static_decls, decl); |
00e8de68 GDR |
566 | } |
567 | } | |
568 | ||
a5e6b29b GDR |
569 | /* Record a decl-node X as belonging to the current lexical scope. |
570 | Check for errors (such as an incompatible declaration for the same | |
d63d5d0c ILT |
571 | name already seen in the same scope). IS_FRIEND is true if X is |
572 | declared as a friend. | |
a5e6b29b GDR |
573 | |
574 | Returns either X or an old decl for the same name. | |
575 | If an old decl is returned, it may have been smashed | |
576 | to agree with what X says. */ | |
577 | ||
578 | tree | |
d63d5d0c | 579 | pushdecl_maybe_friend (tree x, bool is_friend) |
a5e6b29b | 580 | { |
926ce8bd KH |
581 | tree t; |
582 | tree name; | |
a5e6b29b GDR |
583 | int need_new_binding; |
584 | ||
585 | timevar_push (TV_NAME_LOOKUP); | |
586 | ||
2a50edcd VR |
587 | if (x == error_mark_node) |
588 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
589 | ||
a5e6b29b GDR |
590 | need_new_binding = 1; |
591 | ||
592 | if (DECL_TEMPLATE_PARM_P (x)) | |
593 | /* Template parameters have no context; they are not X::T even | |
594 | when declared within a class or namespace. */ | |
595 | ; | |
596 | else | |
597 | { | |
598 | if (current_function_decl && x != current_function_decl | |
599 | /* A local declaration for a function doesn't constitute | |
0cbd7506 | 600 | nesting. */ |
4656bc85 | 601 | && TREE_CODE (x) != FUNCTION_DECL |
a5e6b29b GDR |
602 | /* A local declaration for an `extern' variable is in the |
603 | scope of the current namespace, not the current | |
604 | function. */ | |
605 | && !(TREE_CODE (x) == VAR_DECL && DECL_EXTERNAL (x)) | |
b344d949 JM |
606 | /* When parsing the parameter list of a function declarator, |
607 | don't set DECL_CONTEXT to an enclosing function. When we | |
608 | push the PARM_DECLs in order to process the function body, | |
609 | current_binding_level->this_entity will be set. */ | |
610 | && !(TREE_CODE (x) == PARM_DECL | |
611 | && current_binding_level->kind == sk_function_parms | |
612 | && current_binding_level->this_entity == NULL) | |
a5e6b29b GDR |
613 | && !DECL_CONTEXT (x)) |
614 | DECL_CONTEXT (x) = current_function_decl; | |
615 | ||
616 | /* If this is the declaration for a namespace-scope function, | |
617 | but the declaration itself is in a local scope, mark the | |
618 | declaration. */ | |
619 | if (TREE_CODE (x) == FUNCTION_DECL | |
620 | && DECL_NAMESPACE_SCOPE_P (x) | |
621 | && current_function_decl | |
622 | && x != current_function_decl) | |
623 | DECL_LOCAL_FUNCTION_P (x) = 1; | |
624 | } | |
625 | ||
626 | name = DECL_NAME (x); | |
627 | if (name) | |
628 | { | |
629 | int different_binding_level = 0; | |
630 | ||
631 | if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
632 | name = TREE_OPERAND (name, 0); | |
633 | ||
634 | /* In case this decl was explicitly namespace-qualified, look it | |
635 | up in its namespace context. */ | |
7813d14c | 636 | if (DECL_NAMESPACE_SCOPE_P (x) && namespace_bindings_p ()) |
a5e6b29b GDR |
637 | t = namespace_binding (name, DECL_CONTEXT (x)); |
638 | else | |
461c6fce | 639 | t = lookup_name_innermost_nonclass_level (name); |
a5e6b29b GDR |
640 | |
641 | /* [basic.link] If there is a visible declaration of an entity | |
642 | with linkage having the same name and type, ignoring entities | |
643 | declared outside the innermost enclosing namespace scope, the | |
644 | block scope declaration declares that same entity and | |
645 | receives the linkage of the previous declaration. */ | |
646 | if (! t && current_function_decl && x != current_function_decl | |
647 | && (TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL) | |
648 | && DECL_EXTERNAL (x)) | |
649 | { | |
650 | /* Look in block scope. */ | |
90ea9897 | 651 | t = innermost_non_namespace_value (name); |
a5e6b29b GDR |
652 | /* Or in the innermost namespace. */ |
653 | if (! t) | |
654 | t = namespace_binding (name, DECL_CONTEXT (x)); | |
655 | /* Does it have linkage? Note that if this isn't a DECL, it's an | |
656 | OVERLOAD, which is OK. */ | |
657 | if (t && DECL_P (t) && ! (TREE_STATIC (t) || DECL_EXTERNAL (t))) | |
658 | t = NULL_TREE; | |
659 | if (t) | |
660 | different_binding_level = 1; | |
661 | } | |
662 | ||
663 | /* If we are declaring a function, and the result of name-lookup | |
664 | was an OVERLOAD, look for an overloaded instance that is | |
665 | actually the same as the function we are declaring. (If | |
666 | there is one, we have to merge our declaration with the | |
667 | previous declaration.) */ | |
668 | if (t && TREE_CODE (t) == OVERLOAD) | |
669 | { | |
670 | tree match; | |
671 | ||
672 | if (TREE_CODE (x) == FUNCTION_DECL) | |
673 | for (match = t; match; match = OVL_NEXT (match)) | |
674 | { | |
675 | if (decls_match (OVL_CURRENT (match), x)) | |
676 | break; | |
677 | } | |
678 | else | |
679 | /* Just choose one. */ | |
680 | match = t; | |
681 | ||
682 | if (match) | |
683 | t = OVL_CURRENT (match); | |
684 | else | |
685 | t = NULL_TREE; | |
686 | } | |
687 | ||
58ec3cc5 | 688 | if (t && t != error_mark_node) |
a5e6b29b GDR |
689 | { |
690 | if (different_binding_level) | |
691 | { | |
692 | if (decls_match (x, t)) | |
693 | /* The standard only says that the local extern | |
694 | inherits linkage from the previous decl; in | |
10827cd8 JJ |
695 | particular, default args are not shared. Add |
696 | the decl into a hash table to make sure only | |
697 | the previous decl in this case is seen by the | |
698 | middle end. */ | |
84b8b0e0 | 699 | { |
10827cd8 JJ |
700 | struct cxx_int_tree_map *h; |
701 | void **loc; | |
702 | ||
84b8b0e0 | 703 | TREE_PUBLIC (x) = TREE_PUBLIC (t); |
10827cd8 JJ |
704 | |
705 | if (cp_function_chain->extern_decl_map == NULL) | |
706 | cp_function_chain->extern_decl_map | |
707 | = htab_create_ggc (20, cxx_int_tree_map_hash, | |
708 | cxx_int_tree_map_eq, NULL); | |
709 | ||
710 | h = GGC_NEW (struct cxx_int_tree_map); | |
711 | h->uid = DECL_UID (x); | |
712 | h->to = t; | |
713 | loc = htab_find_slot_with_hash | |
714 | (cp_function_chain->extern_decl_map, h, | |
715 | h->uid, INSERT); | |
716 | *(struct cxx_int_tree_map **) loc = h; | |
84b8b0e0 | 717 | } |
a5e6b29b GDR |
718 | } |
719 | else if (TREE_CODE (t) == PARM_DECL) | |
720 | { | |
a5e6b29b | 721 | /* Check for duplicate params. */ |
52a764ac L |
722 | tree d = duplicate_decls (x, t, is_friend); |
723 | if (d) | |
724 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, d); | |
a5e6b29b GDR |
725 | } |
726 | else if ((DECL_EXTERN_C_FUNCTION_P (x) | |
727 | || DECL_FUNCTION_TEMPLATE_P (x)) | |
728 | && is_overloaded_fn (t)) | |
729 | /* Don't do anything just yet. */; | |
730 | else if (t == wchar_decl_node) | |
731 | { | |
fcf73884 | 732 | if (! DECL_IN_SYSTEM_HEADER (x)) |
509c9d60 | 733 | pedwarn (input_location, OPT_pedantic, "redeclaration of %<wchar_t%> as %qT", |
0cbd7506 | 734 | TREE_TYPE (x)); |
fcf73884 | 735 | |
a5e6b29b GDR |
736 | /* Throw away the redeclaration. */ |
737 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
738 | } | |
b1a19c7c | 739 | else |
a5e6b29b | 740 | { |
d63d5d0c | 741 | tree olddecl = duplicate_decls (x, t, is_friend); |
c8094d83 | 742 | |
b1a19c7c MM |
743 | /* If the redeclaration failed, we can stop at this |
744 | point. */ | |
745 | if (olddecl == error_mark_node) | |
746 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
747 | ||
748 | if (olddecl) | |
749 | { | |
750 | if (TREE_CODE (t) == TYPE_DECL) | |
751 | SET_IDENTIFIER_TYPE_VALUE (name, TREE_TYPE (t)); | |
a5e6b29b | 752 | |
b1a19c7c MM |
753 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); |
754 | } | |
9d363a56 | 755 | else if (DECL_MAIN_P (x) && TREE_CODE (t) == FUNCTION_DECL) |
b1a19c7c MM |
756 | { |
757 | /* A redeclaration of main, but not a duplicate of the | |
758 | previous one. | |
c8094d83 | 759 | |
b1a19c7c | 760 | [basic.start.main] |
c8094d83 | 761 | |
b1a19c7c | 762 | This function shall not be overloaded. */ |
dee15844 | 763 | error ("invalid redeclaration of %q+D", t); |
2a13a625 | 764 | error ("as %qD", x); |
b1a19c7c MM |
765 | /* We don't try to push this declaration since that |
766 | causes a crash. */ | |
767 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
768 | } | |
a5e6b29b GDR |
769 | } |
770 | } | |
771 | ||
ecba6c56 DS |
772 | /* If x has C linkage-specification, (extern "C"), |
773 | lookup its binding, in case it's already bound to an object. | |
774 | The lookup is done in all namespaces. | |
775 | If we find an existing binding, make sure it has the same | |
776 | exception specification as x, otherwise, bail in error [7.5, 7.6]. */ | |
777 | if ((TREE_CODE (x) == FUNCTION_DECL) | |
778 | && DECL_EXTERN_C_P (x) | |
779 | /* We should ignore declarations happening in system headers. */ | |
a70f5987 | 780 | && !DECL_ARTIFICIAL (x) |
ecba6c56 DS |
781 | && !DECL_IN_SYSTEM_HEADER (x)) |
782 | { | |
783 | cxx_binding *function_binding = | |
784 | lookup_extern_c_fun_binding_in_all_ns (x); | |
a70f5987 JM |
785 | tree previous = (function_binding |
786 | ? function_binding->value | |
787 | : NULL_TREE); | |
788 | if (previous | |
789 | && !DECL_ARTIFICIAL (previous) | |
790 | && !DECL_IN_SYSTEM_HEADER (previous) | |
791 | && DECL_CONTEXT (previous) != DECL_CONTEXT (x)) | |
ecba6c56 DS |
792 | { |
793 | tree previous = function_binding->value; | |
794 | ||
795 | /* In case either x or previous is declared to throw an exception, | |
39a13be5 | 796 | make sure both exception specifications are equal. */ |
ecba6c56 DS |
797 | if (decls_match (x, previous)) |
798 | { | |
799 | tree x_exception_spec = NULL_TREE; | |
800 | tree previous_exception_spec = NULL_TREE; | |
801 | ||
802 | x_exception_spec = | |
803 | TYPE_RAISES_EXCEPTIONS (TREE_TYPE (x)); | |
804 | previous_exception_spec = | |
805 | TYPE_RAISES_EXCEPTIONS (TREE_TYPE (previous)); | |
806 | if (!comp_except_specs (previous_exception_spec, | |
807 | x_exception_spec, | |
808 | true)) | |
809 | { | |
509c9d60 | 810 | pedwarn (input_location, 0, "declaration of %q#D with C language linkage", |
fcf73884 | 811 | x); |
509c9d60 | 812 | pedwarn (input_location, 0, "conflicts with previous declaration %q+#D", |
fcf73884 | 813 | previous); |
509c9d60 | 814 | pedwarn (input_location, 0, "due to different exception specifications"); |
ecba6c56 DS |
815 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
816 | } | |
817 | } | |
a70f5987 JM |
818 | else |
819 | { | |
820 | pedwarn (input_location, 0, | |
821 | "declaration of %q#D with C language linkage", x); | |
822 | pedwarn (input_location, 0, | |
823 | "conflicts with previous declaration %q+#D", | |
824 | previous); | |
825 | } | |
ecba6c56 DS |
826 | } |
827 | } | |
828 | ||
a5e6b29b GDR |
829 | check_template_shadow (x); |
830 | ||
3b426391 | 831 | /* If this is a function conjured up by the back end, massage it |
a5e6b29b GDR |
832 | so it looks friendly. */ |
833 | if (DECL_NON_THUNK_FUNCTION_P (x) && ! DECL_LANG_SPECIFIC (x)) | |
834 | { | |
835 | retrofit_lang_decl (x); | |
836 | SET_DECL_LANGUAGE (x, lang_c); | |
837 | } | |
838 | ||
f7cbd40e | 839 | t = x; |
a5e6b29b GDR |
840 | if (DECL_NON_THUNK_FUNCTION_P (x) && ! DECL_FUNCTION_MEMBER_P (x)) |
841 | { | |
d63d5d0c | 842 | t = push_overloaded_decl (x, PUSH_LOCAL, is_friend); |
a5e6b29b GDR |
843 | if (!namespace_bindings_p ()) |
844 | /* We do not need to create a binding for this name; | |
845 | push_overloaded_decl will have already done so if | |
846 | necessary. */ | |
847 | need_new_binding = 0; | |
848 | } | |
849 | else if (DECL_FUNCTION_TEMPLATE_P (x) && DECL_NAMESPACE_SCOPE_P (x)) | |
850 | { | |
d63d5d0c | 851 | t = push_overloaded_decl (x, PUSH_GLOBAL, is_friend); |
a5e6b29b GDR |
852 | if (t == x) |
853 | add_decl_to_level (x, NAMESPACE_LEVEL (CP_DECL_CONTEXT (t))); | |
a5e6b29b GDR |
854 | } |
855 | ||
f7cbd40e JM |
856 | if (TREE_CODE (x) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (x)) |
857 | check_default_args (x); | |
858 | ||
859 | if (t != x || DECL_FUNCTION_TEMPLATE_P (t)) | |
860 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
861 | ||
a5e6b29b GDR |
862 | /* If declaring a type as a typedef, copy the type (unless we're |
863 | at line 0), and install this TYPE_DECL as the new type's typedef | |
d0940d56 | 864 | name. See the extensive comment of set_underlying_type (). */ |
a5e6b29b GDR |
865 | if (TREE_CODE (x) == TYPE_DECL) |
866 | { | |
867 | tree type = TREE_TYPE (x); | |
d0940d56 DS |
868 | |
869 | if (DECL_IS_BUILTIN (x) | |
870 | || (TREE_TYPE (x) != error_mark_node | |
871 | && TYPE_NAME (type) != x | |
872 | /* We don't want to copy the type when all we're | |
873 | doing is making a TYPE_DECL for the purposes of | |
874 | inlining. */ | |
875 | && (!TYPE_NAME (type) | |
876 | || TYPE_NAME (type) != DECL_ABSTRACT_ORIGIN (x)))) | |
877 | set_underlying_type (x); | |
a5e6b29b GDR |
878 | |
879 | if (type != error_mark_node | |
880 | && TYPE_NAME (type) | |
881 | && TYPE_IDENTIFIER (type)) | |
0cbd7506 | 882 | set_identifier_type_value (DECL_NAME (x), x); |
a5e6b29b GDR |
883 | } |
884 | ||
885 | /* Multiple external decls of the same identifier ought to match. | |
886 | ||
887 | We get warnings about inline functions where they are defined. | |
888 | We get warnings about other functions from push_overloaded_decl. | |
889 | ||
890 | Avoid duplicate warnings where they are used. */ | |
891 | if (TREE_PUBLIC (x) && TREE_CODE (x) != FUNCTION_DECL) | |
892 | { | |
893 | tree decl; | |
894 | ||
895 | decl = IDENTIFIER_NAMESPACE_VALUE (name); | |
896 | if (decl && TREE_CODE (decl) == OVERLOAD) | |
897 | decl = OVL_FUNCTION (decl); | |
898 | ||
899 | if (decl && decl != error_mark_node | |
900 | && (DECL_EXTERNAL (decl) || TREE_PUBLIC (decl)) | |
901 | /* If different sort of thing, we already gave an error. */ | |
902 | && TREE_CODE (decl) == TREE_CODE (x) | |
903 | && !same_type_p (TREE_TYPE (x), TREE_TYPE (decl))) | |
904 | { | |
cbe5f3b3 MLI |
905 | permerror (input_location, "type mismatch with previous external decl of %q#D", x); |
906 | permerror (input_location, "previous external decl of %q+#D", decl); | |
a5e6b29b GDR |
907 | } |
908 | } | |
909 | ||
d63d5d0c ILT |
910 | if (TREE_CODE (x) == FUNCTION_DECL |
911 | && is_friend | |
912 | && !flag_friend_injection) | |
913 | { | |
914 | /* This is a new declaration of a friend function, so hide | |
915 | it from ordinary function lookup. */ | |
916 | DECL_ANTICIPATED (x) = 1; | |
917 | DECL_HIDDEN_FRIEND_P (x) = 1; | |
918 | } | |
919 | ||
a5e6b29b GDR |
920 | /* This name is new in its binding level. |
921 | Install the new declaration and return it. */ | |
922 | if (namespace_bindings_p ()) | |
923 | { | |
924 | /* Install a global value. */ | |
925 | ||
926 | /* If the first global decl has external linkage, | |
927 | warn if we later see static one. */ | |
928 | if (IDENTIFIER_GLOBAL_VALUE (name) == NULL_TREE && TREE_PUBLIC (x)) | |
929 | TREE_PUBLIC (name) = 1; | |
930 | ||
0cbd7506 MS |
931 | /* Bind the name for the entity. */ |
932 | if (!(TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x) | |
933 | && t != NULL_TREE) | |
934 | && (TREE_CODE (x) == TYPE_DECL | |
935 | || TREE_CODE (x) == VAR_DECL | |
0cbd7506 MS |
936 | || TREE_CODE (x) == NAMESPACE_DECL |
937 | || TREE_CODE (x) == CONST_DECL | |
938 | || TREE_CODE (x) == TEMPLATE_DECL)) | |
939 | SET_IDENTIFIER_NAMESPACE_VALUE (name, x); | |
a5e6b29b | 940 | |
a5e6b29b GDR |
941 | /* If new decl is `static' and an `extern' was seen previously, |
942 | warn about it. */ | |
943 | if (x != NULL_TREE && t != NULL_TREE && decls_match (x, t)) | |
944 | warn_extern_redeclared_static (x, t); | |
945 | } | |
946 | else | |
947 | { | |
948 | /* Here to install a non-global value. */ | |
90ea9897 | 949 | tree oldlocal = innermost_non_namespace_value (name); |
a5e6b29b GDR |
950 | tree oldglobal = IDENTIFIER_NAMESPACE_VALUE (name); |
951 | ||
952 | if (need_new_binding) | |
953 | { | |
954 | push_local_binding (name, x, 0); | |
955 | /* Because push_local_binding will hook X on to the | |
956 | current_binding_level's name list, we don't want to | |
957 | do that again below. */ | |
958 | need_new_binding = 0; | |
959 | } | |
960 | ||
961 | /* If this is a TYPE_DECL, push it into the type value slot. */ | |
962 | if (TREE_CODE (x) == TYPE_DECL) | |
963 | set_identifier_type_value (name, x); | |
964 | ||
965 | /* Clear out any TYPE_DECL shadowed by a namespace so that | |
966 | we won't think this is a type. The C struct hack doesn't | |
967 | go through namespaces. */ | |
968 | if (TREE_CODE (x) == NAMESPACE_DECL) | |
969 | set_identifier_type_value (name, NULL_TREE); | |
970 | ||
971 | if (oldlocal) | |
972 | { | |
973 | tree d = oldlocal; | |
974 | ||
975 | while (oldlocal | |
976 | && TREE_CODE (oldlocal) == VAR_DECL | |
977 | && DECL_DEAD_FOR_LOCAL (oldlocal)) | |
978 | oldlocal = DECL_SHADOWED_FOR_VAR (oldlocal); | |
979 | ||
980 | if (oldlocal == NULL_TREE) | |
981 | oldlocal = IDENTIFIER_NAMESPACE_VALUE (DECL_NAME (d)); | |
982 | } | |
983 | ||
984 | /* If this is an extern function declaration, see if we | |
985 | have a global definition or declaration for the function. */ | |
986 | if (oldlocal == NULL_TREE | |
987 | && DECL_EXTERNAL (x) | |
988 | && oldglobal != NULL_TREE | |
989 | && TREE_CODE (x) == FUNCTION_DECL | |
990 | && TREE_CODE (oldglobal) == FUNCTION_DECL) | |
991 | { | |
992 | /* We have one. Their types must agree. */ | |
993 | if (decls_match (x, oldglobal)) | |
994 | /* OK */; | |
995 | else | |
996 | { | |
d4ee4d25 | 997 | warning (0, "extern declaration of %q#D doesn't match", x); |
dee15844 | 998 | warning (0, "global declaration %q+#D", oldglobal); |
a5e6b29b GDR |
999 | } |
1000 | } | |
1001 | /* If we have a local external declaration, | |
1002 | and no file-scope declaration has yet been seen, | |
1003 | then if we later have a file-scope decl it must not be static. */ | |
1004 | if (oldlocal == NULL_TREE | |
1005 | && oldglobal == NULL_TREE | |
1006 | && DECL_EXTERNAL (x) | |
1007 | && TREE_PUBLIC (x)) | |
1008 | TREE_PUBLIC (name) = 1; | |
1009 | ||
f9b20c62 JM |
1010 | /* Don't complain about the parms we push and then pop |
1011 | while tentatively parsing a function declarator. */ | |
1012 | if (TREE_CODE (x) == PARM_DECL && DECL_CONTEXT (x) == NULL_TREE) | |
1013 | /* Ignore. */; | |
1014 | ||
a5e6b29b | 1015 | /* Warn if shadowing an argument at the top level of the body. */ |
f9b20c62 JM |
1016 | else if (oldlocal != NULL_TREE && !DECL_EXTERNAL (x) |
1017 | /* Inline decls shadow nothing. */ | |
1018 | && !DECL_FROM_INLINE (x) | |
1019 | && TREE_CODE (oldlocal) == PARM_DECL | |
1020 | /* Don't check the `this' parameter. */ | |
1021 | && !DECL_ARTIFICIAL (oldlocal)) | |
a5e6b29b GDR |
1022 | { |
1023 | bool err = false; | |
1024 | ||
1025 | /* Don't complain if it's from an enclosing function. */ | |
1026 | if (DECL_CONTEXT (oldlocal) == current_function_decl | |
1027 | && TREE_CODE (x) != PARM_DECL) | |
1028 | { | |
1029 | /* Go to where the parms should be and see if we find | |
1030 | them there. */ | |
1031 | struct cp_binding_level *b = current_binding_level->level_chain; | |
1032 | ||
86ad3aa9 JM |
1033 | if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl)) |
1034 | /* Skip the ctor/dtor cleanup level. */ | |
1035 | b = b->level_chain; | |
a5e6b29b GDR |
1036 | |
1037 | /* ARM $8.3 */ | |
1038 | if (b->kind == sk_function_parms) | |
1039 | { | |
2a13a625 | 1040 | error ("declaration of %q#D shadows a parameter", x); |
a5e6b29b GDR |
1041 | err = true; |
1042 | } | |
1043 | } | |
1044 | ||
f9b20c62 | 1045 | if (warn_shadow && !err) |
a6f78652 | 1046 | { |
b323323f LM |
1047 | warning (OPT_Wshadow, "declaration of %q#D shadows a parameter", x); |
1048 | warning (OPT_Wshadow, "%Jshadowed declaration is here", oldlocal); | |
a6f78652 | 1049 | } |
a5e6b29b GDR |
1050 | } |
1051 | ||
1052 | /* Maybe warn if shadowing something else. */ | |
1053 | else if (warn_shadow && !DECL_EXTERNAL (x) | |
1054 | /* No shadow warnings for internally generated vars. */ | |
1055 | && ! DECL_ARTIFICIAL (x) | |
1056 | /* No shadow warnings for vars made for inlining. */ | |
1057 | && ! DECL_FROM_INLINE (x)) | |
1058 | { | |
39fb05d0 MM |
1059 | tree member; |
1060 | ||
1061 | if (current_class_ptr) | |
1062 | member = lookup_member (current_class_type, | |
1063 | name, | |
1064 | /*protect=*/0, | |
1065 | /*want_type=*/false); | |
1066 | else | |
1067 | member = NULL_TREE; | |
c8094d83 | 1068 | |
39fb05d0 | 1069 | if (member && !TREE_STATIC (member)) |
a6f78652 ZW |
1070 | { |
1071 | /* Location of previous decl is not useful in this case. */ | |
b323323f | 1072 | warning (OPT_Wshadow, "declaration of %qD shadows a member of 'this'", |
a6f78652 ZW |
1073 | x); |
1074 | } | |
a5e6b29b GDR |
1075 | else if (oldlocal != NULL_TREE |
1076 | && TREE_CODE (oldlocal) == VAR_DECL) | |
a6f78652 | 1077 | { |
b323323f LM |
1078 | warning (OPT_Wshadow, "declaration of %qD shadows a previous local", x); |
1079 | warning (OPT_Wshadow, "%Jshadowed declaration is here", oldlocal); | |
a6f78652 | 1080 | } |
a5e6b29b GDR |
1081 | else if (oldglobal != NULL_TREE |
1082 | && TREE_CODE (oldglobal) == VAR_DECL) | |
1083 | /* XXX shadow warnings in outer-more namespaces */ | |
a6f78652 | 1084 | { |
b323323f | 1085 | warning (OPT_Wshadow, "declaration of %qD shadows a global declaration", |
a6f78652 | 1086 | x); |
b323323f | 1087 | warning (OPT_Wshadow, "%Jshadowed declaration is here", oldglobal); |
a6f78652 | 1088 | } |
a5e6b29b GDR |
1089 | } |
1090 | } | |
1091 | ||
a5e6b29b GDR |
1092 | if (TREE_CODE (x) == VAR_DECL) |
1093 | maybe_register_incomplete_var (x); | |
1094 | } | |
1095 | ||
1096 | if (need_new_binding) | |
1097 | add_decl_to_level (x, | |
1098 | DECL_NAMESPACE_SCOPE_P (x) | |
1099 | ? NAMESPACE_LEVEL (CP_DECL_CONTEXT (x)) | |
1100 | : current_binding_level); | |
1101 | ||
1102 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
1103 | } | |
1104 | ||
d63d5d0c ILT |
1105 | /* Record a decl-node X as belonging to the current lexical scope. */ |
1106 | ||
1107 | tree | |
1108 | pushdecl (tree x) | |
1109 | { | |
1110 | return pushdecl_maybe_friend (x, false); | |
1111 | } | |
1112 | ||
a5e6b29b GDR |
1113 | /* Enter DECL into the symbol table, if that's appropriate. Returns |
1114 | DECL, or a modified version thereof. */ | |
1115 | ||
1116 | tree | |
1117 | maybe_push_decl (tree decl) | |
1118 | { | |
1119 | tree type = TREE_TYPE (decl); | |
1120 | ||
1121 | /* Add this decl to the current binding level, but not if it comes | |
1122 | from another scope, e.g. a static member variable. TEM may equal | |
1123 | DECL or it may be a previous decl of the same name. */ | |
1124 | if (decl == error_mark_node | |
1125 | || (TREE_CODE (decl) != PARM_DECL | |
1126 | && DECL_CONTEXT (decl) != NULL_TREE | |
1127 | /* Definitions of namespace members outside their namespace are | |
1128 | possible. */ | |
1129 | && TREE_CODE (DECL_CONTEXT (decl)) != NAMESPACE_DECL) | |
1130 | || (TREE_CODE (decl) == TEMPLATE_DECL && !namespace_bindings_p ()) | |
1131 | || TREE_CODE (type) == UNKNOWN_TYPE | |
1132 | /* The declaration of a template specialization does not affect | |
1133 | the functions available for overload resolution, so we do not | |
1134 | call pushdecl. */ | |
1135 | || (TREE_CODE (decl) == FUNCTION_DECL | |
1136 | && DECL_TEMPLATE_SPECIALIZATION (decl))) | |
1137 | return decl; | |
1138 | else | |
1139 | return pushdecl (decl); | |
1140 | } | |
1141 | ||
00e8de68 GDR |
1142 | /* Bind DECL to ID in the current_binding_level, assumed to be a local |
1143 | binding level. If PUSH_USING is set in FLAGS, we know that DECL | |
1144 | doesn't really belong to this binding level, that it got here | |
1145 | through a using-declaration. */ | |
1146 | ||
58ec3cc5 | 1147 | void |
00e8de68 GDR |
1148 | push_local_binding (tree id, tree decl, int flags) |
1149 | { | |
1150 | struct cp_binding_level *b; | |
1151 | ||
1152 | /* Skip over any local classes. This makes sense if we call | |
1153 | push_local_binding with a friend decl of a local class. */ | |
1154 | b = innermost_nonclass_level (); | |
1155 | ||
461c6fce | 1156 | if (lookup_name_innermost_nonclass_level (id)) |
00e8de68 GDR |
1157 | { |
1158 | /* Supplement the existing binding. */ | |
1159 | if (!supplement_binding (IDENTIFIER_BINDING (id), decl)) | |
1160 | /* It didn't work. Something else must be bound at this | |
1161 | level. Do not add DECL to the list of things to pop | |
1162 | later. */ | |
1163 | return; | |
1164 | } | |
1165 | else | |
1166 | /* Create a new binding. */ | |
1167 | push_binding (id, decl, b); | |
1168 | ||
1169 | if (TREE_CODE (decl) == OVERLOAD || (flags & PUSH_USING)) | |
1170 | /* We must put the OVERLOAD into a TREE_LIST since the | |
1171 | TREE_CHAIN of an OVERLOAD is already used. Similarly for | |
1172 | decls that got here through a using-declaration. */ | |
1173 | decl = build_tree_list (NULL_TREE, decl); | |
1174 | ||
1175 | /* And put DECL on the list of things declared by the current | |
1176 | binding level. */ | |
1177 | add_decl_to_level (decl, b); | |
1178 | } | |
a5e6b29b | 1179 | |
a5e6b29b GDR |
1180 | /* Check to see whether or not DECL is a variable that would have been |
1181 | in scope under the ARM, but is not in scope under the ANSI/ISO | |
1182 | standard. If so, issue an error message. If name lookup would | |
1183 | work in both cases, but return a different result, this function | |
1184 | returns the result of ANSI/ISO lookup. Otherwise, it returns | |
1185 | DECL. */ | |
1186 | ||
1187 | tree | |
1188 | check_for_out_of_scope_variable (tree decl) | |
1189 | { | |
1190 | tree shadowed; | |
1191 | ||
1192 | /* We only care about out of scope variables. */ | |
1193 | if (!(TREE_CODE (decl) == VAR_DECL && DECL_DEAD_FOR_LOCAL (decl))) | |
1194 | return decl; | |
1195 | ||
3db45ab5 | 1196 | shadowed = DECL_HAS_SHADOWED_FOR_VAR_P (decl) |
820cc88f | 1197 | ? DECL_SHADOWED_FOR_VAR (decl) : NULL_TREE ; |
a5e6b29b GDR |
1198 | while (shadowed != NULL_TREE && TREE_CODE (shadowed) == VAR_DECL |
1199 | && DECL_DEAD_FOR_LOCAL (shadowed)) | |
3db45ab5 | 1200 | shadowed = DECL_HAS_SHADOWED_FOR_VAR_P (shadowed) |
820cc88f | 1201 | ? DECL_SHADOWED_FOR_VAR (shadowed) : NULL_TREE; |
a5e6b29b GDR |
1202 | if (!shadowed) |
1203 | shadowed = IDENTIFIER_NAMESPACE_VALUE (DECL_NAME (decl)); | |
1204 | if (shadowed) | |
1205 | { | |
1206 | if (!DECL_ERROR_REPORTED (decl)) | |
1207 | { | |
d4ee4d25 | 1208 | warning (0, "name lookup of %qD changed", DECL_NAME (decl)); |
dee15844 JM |
1209 | warning (0, " matches this %q+D under ISO standard rules", |
1210 | shadowed); | |
1211 | warning (0, " matches this %q+D under old rules", decl); | |
a5e6b29b GDR |
1212 | DECL_ERROR_REPORTED (decl) = 1; |
1213 | } | |
1214 | return shadowed; | |
1215 | } | |
1216 | ||
1217 | /* If we have already complained about this declaration, there's no | |
1218 | need to do it again. */ | |
1219 | if (DECL_ERROR_REPORTED (decl)) | |
1220 | return decl; | |
1221 | ||
1222 | DECL_ERROR_REPORTED (decl) = 1; | |
ae5cbc33 RS |
1223 | |
1224 | if (TREE_TYPE (decl) == error_mark_node) | |
1225 | return decl; | |
1226 | ||
a5e6b29b GDR |
1227 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) |
1228 | { | |
37ec60ed | 1229 | error ("name lookup of %qD changed for ISO %<for%> scoping", |
a5e6b29b | 1230 | DECL_NAME (decl)); |
dee15844 JM |
1231 | error (" cannot use obsolete binding at %q+D because " |
1232 | "it has a destructor", decl); | |
a5e6b29b GDR |
1233 | return error_mark_node; |
1234 | } | |
1235 | else | |
1236 | { | |
cbe5f3b3 | 1237 | permerror (input_location, "name lookup of %qD changed for ISO %<for%> scoping", |
37ec60ed JW |
1238 | DECL_NAME (decl)); |
1239 | if (flag_permissive) | |
cbe5f3b3 | 1240 | permerror (input_location, " using obsolete binding at %q+D", decl); |
37ec60ed JW |
1241 | else |
1242 | { | |
1243 | static bool hint; | |
1244 | if (!hint) | |
1245 | { | |
1f5b3869 | 1246 | inform (input_location, "(if you use %<-fpermissive%> G++ will accept your code)"); |
37ec60ed JW |
1247 | hint = true; |
1248 | } | |
1249 | } | |
a5e6b29b GDR |
1250 | } |
1251 | ||
1252 | return decl; | |
1253 | } | |
00e8de68 GDR |
1254 | \f |
1255 | /* true means unconditionally make a BLOCK for the next level pushed. */ | |
1256 | ||
1257 | static bool keep_next_level_flag; | |
1258 | ||
1259 | static int binding_depth = 0; | |
1260 | static int is_class_level = 0; | |
1261 | ||
1262 | static void | |
1263 | indent (int depth) | |
1264 | { | |
1265 | int i; | |
1266 | ||
1267 | for (i = 0; i < depth * 2; i++) | |
1268 | putc (' ', stderr); | |
1269 | } | |
1270 | ||
1271 | /* Return a string describing the kind of SCOPE we have. */ | |
1272 | static const char * | |
1273 | cxx_scope_descriptor (cxx_scope *scope) | |
1274 | { | |
1275 | /* The order of this table must match the "scope_kind" | |
1276 | enumerators. */ | |
1277 | static const char* scope_kind_names[] = { | |
1278 | "block-scope", | |
1279 | "cleanup-scope", | |
1280 | "try-scope", | |
1281 | "catch-scope", | |
1282 | "for-scope", | |
1283 | "function-parameter-scope", | |
1284 | "class-scope", | |
1285 | "namespace-scope", | |
1286 | "template-parameter-scope", | |
1287 | "template-explicit-spec-scope" | |
1288 | }; | |
1289 | const scope_kind kind = scope->explicit_spec_p | |
1290 | ? sk_template_spec : scope->kind; | |
1291 | ||
1292 | return scope_kind_names[kind]; | |
1293 | } | |
1294 | ||
cd0be382 | 1295 | /* Output a debugging information about SCOPE when performing |
00e8de68 GDR |
1296 | ACTION at LINE. */ |
1297 | static void | |
1298 | cxx_scope_debug (cxx_scope *scope, int line, const char *action) | |
1299 | { | |
1300 | const char *desc = cxx_scope_descriptor (scope); | |
1301 | if (scope->this_entity) | |
1302 | verbatim ("%s %s(%E) %p %d\n", action, desc, | |
0cbd7506 | 1303 | scope->this_entity, (void *) scope, line); |
00e8de68 GDR |
1304 | else |
1305 | verbatim ("%s %s %p %d\n", action, desc, (void *) scope, line); | |
1306 | } | |
1307 | ||
1308 | /* Return the estimated initial size of the hashtable of a NAMESPACE | |
1309 | scope. */ | |
1310 | ||
1311 | static inline size_t | |
1312 | namespace_scope_ht_size (tree ns) | |
1313 | { | |
1314 | tree name = DECL_NAME (ns); | |
1315 | ||
1316 | return name == std_identifier | |
1317 | ? NAMESPACE_STD_HT_SIZE | |
1318 | : (name == global_scope_name | |
1319 | ? GLOBAL_SCOPE_HT_SIZE | |
1320 | : NAMESPACE_ORDINARY_HT_SIZE); | |
1321 | } | |
1322 | ||
1323 | /* A chain of binding_level structures awaiting reuse. */ | |
1324 | ||
1431042e | 1325 | static GTY((deletable)) struct cp_binding_level *free_binding_level; |
00e8de68 | 1326 | |
89b578be MM |
1327 | /* Insert SCOPE as the innermost binding level. */ |
1328 | ||
1329 | void | |
1330 | push_binding_level (struct cp_binding_level *scope) | |
1331 | { | |
1332 | /* Add it to the front of currently active scopes stack. */ | |
1333 | scope->level_chain = current_binding_level; | |
1334 | current_binding_level = scope; | |
1335 | keep_next_level_flag = false; | |
1336 | ||
1337 | if (ENABLE_SCOPE_CHECKING) | |
1338 | { | |
1339 | scope->binding_depth = binding_depth; | |
1340 | indent (binding_depth); | |
1341 | cxx_scope_debug (scope, input_line, "push"); | |
1342 | is_class_level = 0; | |
1343 | binding_depth++; | |
1344 | } | |
1345 | } | |
1346 | ||
00e8de68 GDR |
1347 | /* Create a new KIND scope and make it the top of the active scopes stack. |
1348 | ENTITY is the scope of the associated C++ entity (namespace, class, | |
adf2edec | 1349 | function, C++0x enumeration); it is NULL otherwise. */ |
00e8de68 GDR |
1350 | |
1351 | cxx_scope * | |
1352 | begin_scope (scope_kind kind, tree entity) | |
1353 | { | |
1354 | cxx_scope *scope; | |
c8094d83 | 1355 | |
00e8de68 GDR |
1356 | /* Reuse or create a struct for this binding level. */ |
1357 | if (!ENABLE_SCOPE_CHECKING && free_binding_level) | |
1358 | { | |
1359 | scope = free_binding_level; | |
b9eae1a9 | 1360 | memset (scope, 0, sizeof (cxx_scope)); |
00e8de68 GDR |
1361 | free_binding_level = scope->level_chain; |
1362 | } | |
1363 | else | |
b9eae1a9 | 1364 | scope = GGC_CNEW (cxx_scope); |
00e8de68 GDR |
1365 | |
1366 | scope->this_entity = entity; | |
1367 | scope->more_cleanups_ok = true; | |
1368 | switch (kind) | |
1369 | { | |
1370 | case sk_cleanup: | |
1371 | scope->keep = true; | |
1372 | break; | |
c8094d83 | 1373 | |
00e8de68 GDR |
1374 | case sk_template_spec: |
1375 | scope->explicit_spec_p = true; | |
1376 | kind = sk_template_parms; | |
f4f206f4 | 1377 | /* Fall through. */ |
00e8de68 GDR |
1378 | case sk_template_parms: |
1379 | case sk_block: | |
1380 | case sk_try: | |
1381 | case sk_catch: | |
1382 | case sk_for: | |
1383 | case sk_class: | |
adf2edec | 1384 | case sk_scoped_enum: |
00e8de68 | 1385 | case sk_function_parms: |
1799e5d5 | 1386 | case sk_omp: |
00e8de68 GDR |
1387 | scope->keep = keep_next_level_flag; |
1388 | break; | |
1389 | ||
1390 | case sk_namespace: | |
00e8de68 | 1391 | NAMESPACE_LEVEL (entity) = scope; |
9857866d KH |
1392 | scope->static_decls = |
1393 | VEC_alloc (tree, gc, | |
1394 | DECL_NAME (entity) == std_identifier | |
1395 | || DECL_NAME (entity) == global_scope_name | |
1396 | ? 200 : 10); | |
00e8de68 GDR |
1397 | break; |
1398 | ||
1399 | default: | |
1400 | /* Should not happen. */ | |
50bc768d | 1401 | gcc_unreachable (); |
00e8de68 GDR |
1402 | break; |
1403 | } | |
1404 | scope->kind = kind; | |
1405 | ||
89b578be | 1406 | push_binding_level (scope); |
00e8de68 GDR |
1407 | |
1408 | return scope; | |
1409 | } | |
1410 | ||
1411 | /* We're about to leave current scope. Pop the top of the stack of | |
1412 | currently active scopes. Return the enclosing scope, now active. */ | |
1413 | ||
1414 | cxx_scope * | |
1415 | leave_scope (void) | |
1416 | { | |
1417 | cxx_scope *scope = current_binding_level; | |
1418 | ||
1419 | if (scope->kind == sk_namespace && class_binding_level) | |
1420 | current_binding_level = class_binding_level; | |
1421 | ||
1422 | /* We cannot leave a scope, if there are none left. */ | |
1423 | if (NAMESPACE_LEVEL (global_namespace)) | |
50bc768d | 1424 | gcc_assert (!global_scope_p (scope)); |
c8094d83 | 1425 | |
00e8de68 GDR |
1426 | if (ENABLE_SCOPE_CHECKING) |
1427 | { | |
1428 | indent (--binding_depth); | |
93409b8c | 1429 | cxx_scope_debug (scope, input_line, "leave"); |
00e8de68 | 1430 | if (is_class_level != (scope == class_binding_level)) |
0cbd7506 MS |
1431 | { |
1432 | indent (binding_depth); | |
1433 | verbatim ("XXX is_class_level != (current_scope == class_scope)\n"); | |
1434 | } | |
00e8de68 GDR |
1435 | is_class_level = 0; |
1436 | } | |
1437 | ||
1438 | /* Move one nesting level up. */ | |
1439 | current_binding_level = scope->level_chain; | |
1440 | ||
89b578be | 1441 | /* Namespace-scopes are left most probably temporarily, not |
0ed5edac | 1442 | completely; they can be reopened later, e.g. in namespace-extension |
89b578be MM |
1443 | or any name binding activity that requires us to resume a |
1444 | namespace. For classes, we cache some binding levels. For other | |
00e8de68 | 1445 | scopes, we just make the structure available for reuse. */ |
89b578be MM |
1446 | if (scope->kind != sk_namespace |
1447 | && scope->kind != sk_class) | |
00e8de68 GDR |
1448 | { |
1449 | scope->level_chain = free_binding_level; | |
50bc768d NS |
1450 | gcc_assert (!ENABLE_SCOPE_CHECKING |
1451 | || scope->binding_depth == binding_depth); | |
00e8de68 GDR |
1452 | free_binding_level = scope; |
1453 | } | |
1454 | ||
1455 | /* Find the innermost enclosing class scope, and reset | |
1456 | CLASS_BINDING_LEVEL appropriately. */ | |
5423d7eb RS |
1457 | if (scope->kind == sk_class) |
1458 | { | |
1459 | class_binding_level = NULL; | |
1460 | for (scope = current_binding_level; scope; scope = scope->level_chain) | |
1461 | if (scope->kind == sk_class) | |
1462 | { | |
1463 | class_binding_level = scope; | |
1464 | break; | |
1465 | } | |
1466 | } | |
00e8de68 GDR |
1467 | |
1468 | return current_binding_level; | |
1469 | } | |
1470 | ||
1471 | static void | |
1472 | resume_scope (struct cp_binding_level* b) | |
1473 | { | |
1474 | /* Resuming binding levels is meant only for namespaces, | |
1475 | and those cannot nest into classes. */ | |
50bc768d | 1476 | gcc_assert (!class_binding_level); |
00e8de68 | 1477 | /* Also, resuming a non-directly nested namespace is a no-no. */ |
50bc768d | 1478 | gcc_assert (b->level_chain == current_binding_level); |
00e8de68 GDR |
1479 | current_binding_level = b; |
1480 | if (ENABLE_SCOPE_CHECKING) | |
1481 | { | |
1482 | b->binding_depth = binding_depth; | |
1483 | indent (binding_depth); | |
93409b8c | 1484 | cxx_scope_debug (b, input_line, "resume"); |
00e8de68 GDR |
1485 | is_class_level = 0; |
1486 | binding_depth++; | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | /* Return the innermost binding level that is not for a class scope. */ | |
1491 | ||
1492 | static cxx_scope * | |
1493 | innermost_nonclass_level (void) | |
1494 | { | |
1495 | cxx_scope *b; | |
1496 | ||
1497 | b = current_binding_level; | |
1498 | while (b->kind == sk_class) | |
1499 | b = b->level_chain; | |
1500 | ||
1501 | return b; | |
1502 | } | |
1503 | ||
1504 | /* We're defining an object of type TYPE. If it needs a cleanup, but | |
1505 | we're not allowed to add any more objects with cleanups to the current | |
1506 | scope, create a new binding level. */ | |
1507 | ||
1508 | void | |
1509 | maybe_push_cleanup_level (tree type) | |
1510 | { | |
bb8b4ed6 MM |
1511 | if (type != error_mark_node |
1512 | && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) | |
00e8de68 GDR |
1513 | && current_binding_level->more_cleanups_ok == 0) |
1514 | { | |
1515 | begin_scope (sk_cleanup, NULL); | |
325c3691 | 1516 | current_binding_level->statement_list = push_stmt_list (); |
00e8de68 GDR |
1517 | } |
1518 | } | |
1519 | ||
1520 | /* Nonzero if we are currently in the global binding level. */ | |
1521 | ||
1522 | int | |
1523 | global_bindings_p (void) | |
1524 | { | |
1525 | return global_scope_p (current_binding_level); | |
1526 | } | |
1527 | ||
1528 | /* True if we are currently in a toplevel binding level. This | |
1529 | means either the global binding level or a namespace in a toplevel | |
1530 | binding level. Since there are no non-toplevel namespace levels, | |
1531 | this really means any namespace or template parameter level. We | |
1532 | also include a class whose context is toplevel. */ | |
1533 | ||
1534 | bool | |
1535 | toplevel_bindings_p (void) | |
1536 | { | |
1537 | struct cp_binding_level *b = innermost_nonclass_level (); | |
1538 | ||
1539 | return b->kind == sk_namespace || b->kind == sk_template_parms; | |
1540 | } | |
1541 | ||
1542 | /* True if this is a namespace scope, or if we are defining a class | |
1543 | which is itself at namespace scope, or whose enclosing class is | |
1544 | such a class, etc. */ | |
1545 | ||
1546 | bool | |
1547 | namespace_bindings_p (void) | |
1548 | { | |
1549 | struct cp_binding_level *b = innermost_nonclass_level (); | |
1550 | ||
1551 | return b->kind == sk_namespace; | |
1552 | } | |
1553 | ||
1554 | /* True if the current level needs to have a BLOCK made. */ | |
1555 | ||
1556 | bool | |
1557 | kept_level_p (void) | |
1558 | { | |
1559 | return (current_binding_level->blocks != NULL_TREE | |
1560 | || current_binding_level->keep | |
0cbd7506 | 1561 | || current_binding_level->kind == sk_cleanup |
2ac1e975 DS |
1562 | || current_binding_level->names != NULL_TREE |
1563 | || current_binding_level->using_directives); | |
00e8de68 GDR |
1564 | } |
1565 | ||
1566 | /* Returns the kind of the innermost scope. */ | |
1567 | ||
1568 | scope_kind | |
1569 | innermost_scope_kind (void) | |
1570 | { | |
1571 | return current_binding_level->kind; | |
1572 | } | |
1573 | ||
1574 | /* Returns true if this scope was created to store template parameters. */ | |
1575 | ||
1576 | bool | |
1577 | template_parm_scope_p (void) | |
1578 | { | |
1579 | return innermost_scope_kind () == sk_template_parms; | |
1580 | } | |
1581 | ||
1582 | /* If KEEP is true, make a BLOCK node for the next binding level, | |
1583 | unconditionally. Otherwise, use the normal logic to decide whether | |
1584 | or not to create a BLOCK. */ | |
1585 | ||
1586 | void | |
1587 | keep_next_level (bool keep) | |
1588 | { | |
1589 | keep_next_level_flag = keep; | |
1590 | } | |
1591 | ||
1592 | /* Return the list of declarations of the current level. | |
1593 | Note that this list is in reverse order unless/until | |
1594 | you nreverse it; and when you do nreverse it, you must | |
1595 | store the result back using `storedecls' or you will lose. */ | |
1596 | ||
1597 | tree | |
1598 | getdecls (void) | |
1599 | { | |
1600 | return current_binding_level->names; | |
1601 | } | |
1602 | ||
00e8de68 GDR |
1603 | /* For debugging. */ |
1604 | static int no_print_functions = 0; | |
1605 | static int no_print_builtins = 0; | |
1606 | ||
b8c1703b | 1607 | static void |
00e8de68 GDR |
1608 | print_binding_level (struct cp_binding_level* lvl) |
1609 | { | |
1610 | tree t; | |
1611 | int i = 0, len; | |
06145cb9 | 1612 | fprintf (stderr, " blocks=%p", (void *) lvl->blocks); |
00e8de68 GDR |
1613 | if (lvl->more_cleanups_ok) |
1614 | fprintf (stderr, " more-cleanups-ok"); | |
1615 | if (lvl->have_cleanups) | |
1616 | fprintf (stderr, " have-cleanups"); | |
1617 | fprintf (stderr, "\n"); | |
1618 | if (lvl->names) | |
1619 | { | |
1620 | fprintf (stderr, " names:\t"); | |
1621 | /* We can probably fit 3 names to a line? */ | |
1622 | for (t = lvl->names; t; t = TREE_CHAIN (t)) | |
1623 | { | |
1624 | if (no_print_functions && (TREE_CODE (t) == FUNCTION_DECL)) | |
1625 | continue; | |
1626 | if (no_print_builtins | |
1627 | && (TREE_CODE (t) == TYPE_DECL) | |
93409b8c | 1628 | && DECL_IS_BUILTIN (t)) |
00e8de68 GDR |
1629 | continue; |
1630 | ||
1631 | /* Function decls tend to have longer names. */ | |
1632 | if (TREE_CODE (t) == FUNCTION_DECL) | |
1633 | len = 3; | |
1634 | else | |
1635 | len = 2; | |
1636 | i += len; | |
1637 | if (i > 6) | |
1638 | { | |
1639 | fprintf (stderr, "\n\t"); | |
1640 | i = len; | |
1641 | } | |
1642 | print_node_brief (stderr, "", t, 0); | |
1643 | if (t == error_mark_node) | |
1644 | break; | |
1645 | } | |
1646 | if (i) | |
0cbd7506 | 1647 | fprintf (stderr, "\n"); |
00e8de68 | 1648 | } |
89b578be | 1649 | if (VEC_length (cp_class_binding, lvl->class_shadowed)) |
00e8de68 | 1650 | { |
89b578be MM |
1651 | size_t i; |
1652 | cp_class_binding *b; | |
00e8de68 | 1653 | fprintf (stderr, " class-shadowed:"); |
c8094d83 | 1654 | for (i = 0; |
9ba5ff0f | 1655 | VEC_iterate(cp_class_binding, lvl->class_shadowed, i, b); |
c8094d83 | 1656 | ++i) |
89b578be | 1657 | fprintf (stderr, " %s ", IDENTIFIER_POINTER (b->identifier)); |
00e8de68 GDR |
1658 | fprintf (stderr, "\n"); |
1659 | } | |
1660 | if (lvl->type_shadowed) | |
1661 | { | |
1662 | fprintf (stderr, " type-shadowed:"); | |
1663 | for (t = lvl->type_shadowed; t; t = TREE_CHAIN (t)) | |
0cbd7506 | 1664 | { |
00e8de68 | 1665 | fprintf (stderr, " %s ", IDENTIFIER_POINTER (TREE_PURPOSE (t))); |
0cbd7506 | 1666 | } |
00e8de68 GDR |
1667 | fprintf (stderr, "\n"); |
1668 | } | |
1669 | } | |
1670 | ||
1671 | void | |
1672 | print_other_binding_stack (struct cp_binding_level *stack) | |
1673 | { | |
1674 | struct cp_binding_level *level; | |
1675 | for (level = stack; !global_scope_p (level); level = level->level_chain) | |
1676 | { | |
06145cb9 | 1677 | fprintf (stderr, "binding level %p\n", (void *) level); |
00e8de68 GDR |
1678 | print_binding_level (level); |
1679 | } | |
1680 | } | |
1681 | ||
1682 | void | |
1683 | print_binding_stack (void) | |
1684 | { | |
1685 | struct cp_binding_level *b; | |
06145cb9 KG |
1686 | fprintf (stderr, "current_binding_level=%p\n" |
1687 | "class_binding_level=%p\n" | |
1688 | "NAMESPACE_LEVEL (global_namespace)=%p\n", | |
00e8de68 | 1689 | (void *) current_binding_level, (void *) class_binding_level, |
0cbd7506 | 1690 | (void *) NAMESPACE_LEVEL (global_namespace)); |
00e8de68 GDR |
1691 | if (class_binding_level) |
1692 | { | |
1693 | for (b = class_binding_level; b; b = b->level_chain) | |
1694 | if (b == current_binding_level) | |
1695 | break; | |
1696 | if (b) | |
1697 | b = class_binding_level; | |
1698 | else | |
1699 | b = current_binding_level; | |
1700 | } | |
1701 | else | |
1702 | b = current_binding_level; | |
1703 | print_other_binding_stack (b); | |
1704 | fprintf (stderr, "global:\n"); | |
1705 | print_binding_level (NAMESPACE_LEVEL (global_namespace)); | |
1706 | } | |
ed3cf953 | 1707 | \f |
00e8de68 GDR |
1708 | /* Return the type associated with id. */ |
1709 | ||
1710 | tree | |
1711 | identifier_type_value (tree id) | |
1712 | { | |
1713 | timevar_push (TV_NAME_LOOKUP); | |
1714 | /* There is no type with that name, anywhere. */ | |
1715 | if (REAL_IDENTIFIER_TYPE_VALUE (id) == NULL_TREE) | |
1716 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
1717 | /* This is not the type marker, but the real thing. */ | |
1718 | if (REAL_IDENTIFIER_TYPE_VALUE (id) != global_type_node) | |
1719 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, REAL_IDENTIFIER_TYPE_VALUE (id)); | |
1720 | /* Have to search for it. It must be on the global level, now. | |
1721 | Ask lookup_name not to return non-types. */ | |
12cf89fa | 1722 | id = lookup_name_real (id, 2, 1, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
1723 | if (id) |
1724 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, TREE_TYPE (id)); | |
1725 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
1726 | } | |
1727 | ||
1728 | /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since | |
1729 | the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */ | |
1730 | ||
1731 | tree | |
1732 | identifier_global_value (tree t) | |
1733 | { | |
1734 | return IDENTIFIER_GLOBAL_VALUE (t); | |
1735 | } | |
1736 | ||
1737 | /* Push a definition of struct, union or enum tag named ID. into | |
1738 | binding_level B. DECL is a TYPE_DECL for the type. We assume that | |
1739 | the tag ID is not already defined. */ | |
1740 | ||
1741 | static void | |
1742 | set_identifier_type_value_with_scope (tree id, tree decl, cxx_scope *b) | |
1743 | { | |
1744 | tree type; | |
1745 | ||
1746 | if (b->kind != sk_namespace) | |
1747 | { | |
1748 | /* Shadow the marker, not the real thing, so that the marker | |
1749 | gets restored later. */ | |
1750 | tree old_type_value = REAL_IDENTIFIER_TYPE_VALUE (id); | |
1751 | b->type_shadowed | |
1752 | = tree_cons (id, old_type_value, b->type_shadowed); | |
1753 | type = decl ? TREE_TYPE (decl) : NULL_TREE; | |
39fb05d0 | 1754 | TREE_TYPE (b->type_shadowed) = type; |
00e8de68 GDR |
1755 | } |
1756 | else | |
1757 | { | |
1758 | cxx_binding *binding = | |
1759 | binding_for_name (NAMESPACE_LEVEL (current_namespace), id); | |
315fb5db NS |
1760 | gcc_assert (decl); |
1761 | if (binding->value) | |
1762 | supplement_binding (binding, decl); | |
00e8de68 | 1763 | else |
315fb5db | 1764 | binding->value = decl; |
c8094d83 | 1765 | |
00e8de68 GDR |
1766 | /* Store marker instead of real type. */ |
1767 | type = global_type_node; | |
1768 | } | |
1769 | SET_IDENTIFIER_TYPE_VALUE (id, type); | |
1770 | } | |
1771 | ||
1772 | /* As set_identifier_type_value_with_scope, but using | |
1773 | current_binding_level. */ | |
1774 | ||
1775 | void | |
1776 | set_identifier_type_value (tree id, tree decl) | |
1777 | { | |
1778 | set_identifier_type_value_with_scope (id, decl, current_binding_level); | |
1779 | } | |
1780 | ||
5a167978 GDR |
1781 | /* Return the name for the constructor (or destructor) for the |
1782 | specified class TYPE. When given a template, this routine doesn't | |
1783 | lose the specialization. */ | |
1784 | ||
b8c1703b | 1785 | static inline tree |
5a167978 GDR |
1786 | constructor_name_full (tree type) |
1787 | { | |
508a1c9c | 1788 | return TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (type)); |
5a167978 GDR |
1789 | } |
1790 | ||
1791 | /* Return the name for the constructor (or destructor) for the | |
1792 | specified class. When given a template, return the plain | |
1793 | unspecialized name. */ | |
1794 | ||
1795 | tree | |
1796 | constructor_name (tree type) | |
1797 | { | |
1798 | tree name; | |
1799 | name = constructor_name_full (type); | |
1800 | if (IDENTIFIER_TEMPLATE (name)) | |
1801 | name = IDENTIFIER_TEMPLATE (name); | |
1802 | return name; | |
1803 | } | |
1804 | ||
dbc21af5 PC |
1805 | /* Returns TRUE if NAME is the name for the constructor for TYPE, |
1806 | which must be a class type. */ | |
5a167978 GDR |
1807 | |
1808 | bool | |
1809 | constructor_name_p (tree name, tree type) | |
1810 | { | |
1811 | tree ctor_name; | |
1812 | ||
9e1e64ec | 1813 | gcc_assert (MAYBE_CLASS_TYPE_P (type)); |
dbc21af5 | 1814 | |
5a167978 GDR |
1815 | if (!name) |
1816 | return false; | |
c8094d83 | 1817 | |
5a167978 GDR |
1818 | if (TREE_CODE (name) != IDENTIFIER_NODE) |
1819 | return false; | |
c8094d83 | 1820 | |
5a167978 GDR |
1821 | ctor_name = constructor_name_full (type); |
1822 | if (name == ctor_name) | |
1823 | return true; | |
1824 | if (IDENTIFIER_TEMPLATE (ctor_name) | |
1825 | && name == IDENTIFIER_TEMPLATE (ctor_name)) | |
1826 | return true; | |
1827 | return false; | |
1828 | } | |
1829 | ||
a5e6b29b GDR |
1830 | /* Counter used to create anonymous type names. */ |
1831 | ||
1832 | static GTY(()) int anon_cnt; | |
1833 | ||
1834 | /* Return an IDENTIFIER which can be used as a name for | |
1835 | anonymous structs and unions. */ | |
1836 | ||
1837 | tree | |
1838 | make_anon_name (void) | |
1839 | { | |
1840 | char buf[32]; | |
1841 | ||
1842 | sprintf (buf, ANON_AGGRNAME_FORMAT, anon_cnt++); | |
1843 | return get_identifier (buf); | |
1844 | } | |
1845 | ||
c8094d83 | 1846 | /* Return (from the stack of) the BINDING, if any, established at SCOPE. */ |
ed3cf953 GDR |
1847 | |
1848 | static inline cxx_binding * | |
1849 | find_binding (cxx_scope *scope, cxx_binding *binding) | |
1850 | { | |
1851 | timevar_push (TV_NAME_LOOKUP); | |
1852 | ||
1853 | for (; binding != NULL; binding = binding->previous) | |
147135cc | 1854 | if (binding->scope == scope) |
ed3cf953 GDR |
1855 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, binding); |
1856 | ||
da247ccc | 1857 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, (cxx_binding *)0); |
ed3cf953 GDR |
1858 | } |
1859 | ||
1860 | /* Return the binding for NAME in SCOPE, if any. Otherwise, return NULL. */ | |
daafa301 | 1861 | |
5a167978 | 1862 | static inline cxx_binding * |
ed3cf953 GDR |
1863 | cxx_scope_find_binding_for_name (cxx_scope *scope, tree name) |
1864 | { | |
1865 | cxx_binding *b = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
1866 | if (b) | |
1867 | { | |
1868 | /* Fold-in case where NAME is used only once. */ | |
147135cc | 1869 | if (scope == b->scope && b->previous == NULL) |
0cbd7506 | 1870 | return b; |
ed3cf953 GDR |
1871 | return find_binding (scope, b); |
1872 | } | |
1873 | return NULL; | |
1874 | } | |
1875 | ||
1876 | /* Always returns a binding for name in scope. If no binding is | |
1877 | found, make a new one. */ | |
1878 | ||
5a167978 | 1879 | static cxx_binding * |
ed3cf953 GDR |
1880 | binding_for_name (cxx_scope *scope, tree name) |
1881 | { | |
1882 | cxx_binding *result; | |
1883 | ||
1884 | result = cxx_scope_find_binding_for_name (scope, name); | |
1885 | if (result) | |
1886 | return result; | |
1887 | /* Not found, make a new one. */ | |
1888 | result = cxx_binding_make (NULL, NULL); | |
1889 | result->previous = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
147135cc | 1890 | result->scope = scope; |
ed3cf953 GDR |
1891 | result->is_local = false; |
1892 | result->value_is_inherited = false; | |
1893 | IDENTIFIER_NAMESPACE_BINDINGS (name) = result; | |
1894 | return result; | |
1895 | } | |
ed3cf953 | 1896 | |
ecba6c56 DS |
1897 | /* Walk through the bindings associated to the name of FUNCTION, |
1898 | and return the first binding that declares a function with a | |
1899 | "C" linkage specification, a.k.a 'extern "C"'. | |
1900 | This function looks for the binding, regardless of which scope it | |
1901 | has been defined in. It basically looks in all the known scopes. | |
1902 | Note that this function does not lookup for bindings of builtin functions | |
1903 | or for functions declared in system headers. */ | |
1904 | static cxx_binding* | |
1905 | lookup_extern_c_fun_binding_in_all_ns (tree function) | |
1906 | { | |
1907 | tree name; | |
1908 | cxx_binding *iter; | |
1909 | ||
1910 | gcc_assert (function && TREE_CODE (function) == FUNCTION_DECL); | |
1911 | ||
1912 | name = DECL_NAME (function); | |
1913 | gcc_assert (name && TREE_CODE (name) == IDENTIFIER_NODE); | |
1914 | ||
1915 | for (iter = IDENTIFIER_NAMESPACE_BINDINGS (name); | |
1916 | iter; | |
1917 | iter = iter->previous) | |
1918 | { | |
1919 | if (iter->value | |
1920 | && TREE_CODE (iter->value) == FUNCTION_DECL | |
1921 | && DECL_EXTERN_C_P (iter->value) | |
1922 | && !DECL_ARTIFICIAL (iter->value)) | |
1923 | { | |
1924 | return iter; | |
1925 | } | |
1926 | } | |
1927 | return NULL; | |
1928 | } | |
1929 | ||
a5e6b29b GDR |
1930 | /* Insert another USING_DECL into the current binding level, returning |
1931 | this declaration. If this is a redeclaration, do nothing, and | |
1932 | return NULL_TREE if this not in namespace scope (in namespace | |
1933 | scope, a using decl might extend any previous bindings). */ | |
1934 | ||
b5791fdc | 1935 | static tree |
a5e6b29b GDR |
1936 | push_using_decl (tree scope, tree name) |
1937 | { | |
1938 | tree decl; | |
1939 | ||
1940 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d NS |
1941 | gcc_assert (TREE_CODE (scope) == NAMESPACE_DECL); |
1942 | gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); | |
a5e6b29b | 1943 | for (decl = current_binding_level->usings; decl; decl = TREE_CHAIN (decl)) |
98ed9dae | 1944 | if (USING_DECL_SCOPE (decl) == scope && DECL_NAME (decl) == name) |
a5e6b29b GDR |
1945 | break; |
1946 | if (decl) | |
1947 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 1948 | namespace_bindings_p () ? decl : NULL_TREE); |
98ed9dae NS |
1949 | decl = build_lang_decl (USING_DECL, name, NULL_TREE); |
1950 | USING_DECL_SCOPE (decl) = scope; | |
a5e6b29b GDR |
1951 | TREE_CHAIN (decl) = current_binding_level->usings; |
1952 | current_binding_level->usings = decl; | |
1953 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
1954 | } | |
1955 | ||
00e8de68 GDR |
1956 | /* Same as pushdecl, but define X in binding-level LEVEL. We rely on the |
1957 | caller to set DECL_CONTEXT properly. */ | |
ed3cf953 GDR |
1958 | |
1959 | tree | |
d63d5d0c | 1960 | pushdecl_with_scope (tree x, cxx_scope *level, bool is_friend) |
ed3cf953 | 1961 | { |
926ce8bd | 1962 | struct cp_binding_level *b; |
00e8de68 | 1963 | tree function_decl = current_function_decl; |
ed3cf953 | 1964 | |
00e8de68 GDR |
1965 | timevar_push (TV_NAME_LOOKUP); |
1966 | current_function_decl = NULL_TREE; | |
1967 | if (level->kind == sk_class) | |
1968 | { | |
1969 | b = class_binding_level; | |
1970 | class_binding_level = level; | |
1971 | pushdecl_class_level (x); | |
1972 | class_binding_level = b; | |
1973 | } | |
1974 | else | |
1975 | { | |
1976 | b = current_binding_level; | |
1977 | current_binding_level = level; | |
d63d5d0c | 1978 | x = pushdecl_maybe_friend (x, is_friend); |
00e8de68 GDR |
1979 | current_binding_level = b; |
1980 | } | |
1981 | current_function_decl = function_decl; | |
1982 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
1983 | } | |
1984 | ||
a5e6b29b GDR |
1985 | /* DECL is a FUNCTION_DECL for a non-member function, which may have |
1986 | other definitions already in place. We get around this by making | |
1987 | the value of the identifier point to a list of all the things that | |
1988 | want to be referenced by that name. It is then up to the users of | |
1989 | that name to decide what to do with that list. | |
1990 | ||
1991 | DECL may also be a TEMPLATE_DECL, with a FUNCTION_DECL in its | |
1992 | DECL_TEMPLATE_RESULT. It is dealt with the same way. | |
1993 | ||
1994 | FLAGS is a bitwise-or of the following values: | |
1995 | PUSH_LOCAL: Bind DECL in the current scope, rather than at | |
0cbd7506 | 1996 | namespace scope. |
a5e6b29b | 1997 | PUSH_USING: DECL is being pushed as the result of a using |
0cbd7506 | 1998 | declaration. |
a5e6b29b | 1999 | |
d63d5d0c ILT |
2000 | IS_FRIEND is true if this is a friend declaration. |
2001 | ||
a5e6b29b GDR |
2002 | The value returned may be a previous declaration if we guessed wrong |
2003 | about what language DECL should belong to (C or C++). Otherwise, | |
2004 | it's always DECL (and never something that's not a _DECL). */ | |
2005 | ||
2006 | static tree | |
d63d5d0c | 2007 | push_overloaded_decl (tree decl, int flags, bool is_friend) |
a5e6b29b GDR |
2008 | { |
2009 | tree name = DECL_NAME (decl); | |
2010 | tree old; | |
2011 | tree new_binding; | |
2012 | int doing_global = (namespace_bindings_p () || !(flags & PUSH_LOCAL)); | |
2013 | ||
2014 | timevar_push (TV_NAME_LOOKUP); | |
2015 | if (doing_global) | |
2016 | old = namespace_binding (name, DECL_CONTEXT (decl)); | |
2017 | else | |
461c6fce | 2018 | old = lookup_name_innermost_nonclass_level (name); |
a5e6b29b GDR |
2019 | |
2020 | if (old) | |
2021 | { | |
2022 | if (TREE_CODE (old) == TYPE_DECL && DECL_ARTIFICIAL (old)) | |
2023 | { | |
2024 | tree t = TREE_TYPE (old); | |
9e1e64ec | 2025 | if (MAYBE_CLASS_TYPE_P (t) && warn_shadow |
a5e6b29b GDR |
2026 | && (! DECL_IN_SYSTEM_HEADER (decl) |
2027 | || ! DECL_IN_SYSTEM_HEADER (old))) | |
683d6ff9 | 2028 | warning (OPT_Wshadow, "%q#D hides constructor for %q#T", decl, t); |
a5e6b29b GDR |
2029 | old = NULL_TREE; |
2030 | } | |
2031 | else if (is_overloaded_fn (old)) | |
0cbd7506 MS |
2032 | { |
2033 | tree tmp; | |
a5e6b29b GDR |
2034 | |
2035 | for (tmp = old; tmp; tmp = OVL_NEXT (tmp)) | |
2036 | { | |
2037 | tree fn = OVL_CURRENT (tmp); | |
7ca383e6 | 2038 | tree dup; |
a5e6b29b GDR |
2039 | |
2040 | if (TREE_CODE (tmp) == OVERLOAD && OVL_USED (tmp) | |
2041 | && !(flags & PUSH_USING) | |
2042 | && compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
713101a6 AO |
2043 | TYPE_ARG_TYPES (TREE_TYPE (decl))) |
2044 | && ! decls_match (fn, decl)) | |
2a13a625 | 2045 | error ("%q#D conflicts with previous using declaration %q#D", |
0cbd7506 | 2046 | decl, fn); |
a5e6b29b | 2047 | |
7ca383e6 MM |
2048 | dup = duplicate_decls (decl, fn, is_friend); |
2049 | /* If DECL was a redeclaration of FN -- even an invalid | |
2050 | one -- pass that information along to our caller. */ | |
2051 | if (dup == fn || dup == error_mark_node) | |
2052 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, dup); | |
a5e6b29b | 2053 | } |
1a32490a AO |
2054 | |
2055 | /* We don't overload implicit built-ins. duplicate_decls() | |
2056 | may fail to merge the decls if the new decl is e.g. a | |
2057 | template function. */ | |
2058 | if (TREE_CODE (old) == FUNCTION_DECL | |
d63d5d0c ILT |
2059 | && DECL_ANTICIPATED (old) |
2060 | && !DECL_HIDDEN_FRIEND_P (old)) | |
1a32490a | 2061 | old = NULL; |
a5e6b29b GDR |
2062 | } |
2063 | else if (old == error_mark_node) | |
2064 | /* Ignore the undefined symbol marker. */ | |
2065 | old = NULL_TREE; | |
2066 | else | |
2067 | { | |
dee15844 | 2068 | error ("previous non-function declaration %q+#D", old); |
2a13a625 | 2069 | error ("conflicts with function declaration %q#D", decl); |
a5e6b29b GDR |
2070 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); |
2071 | } | |
2072 | } | |
2073 | ||
f3162000 GB |
2074 | if (old || TREE_CODE (decl) == TEMPLATE_DECL |
2075 | /* If it's a using declaration, we always need to build an OVERLOAD, | |
2076 | because it's the only way to remember that the declaration comes | |
2077 | from 'using', and have the lookup behave correctly. */ | |
2078 | || (flags & PUSH_USING)) | |
a5e6b29b GDR |
2079 | { |
2080 | if (old && TREE_CODE (old) != OVERLOAD) | |
2081 | new_binding = ovl_cons (decl, ovl_cons (old, NULL_TREE)); | |
2082 | else | |
2083 | new_binding = ovl_cons (decl, old); | |
2084 | if (flags & PUSH_USING) | |
2085 | OVL_USED (new_binding) = 1; | |
2086 | } | |
2087 | else | |
3c28fc74 | 2088 | /* NAME is not ambiguous. */ |
a5e6b29b GDR |
2089 | new_binding = decl; |
2090 | ||
2091 | if (doing_global) | |
2092 | set_namespace_binding (name, current_namespace, new_binding); | |
2093 | else | |
2094 | { | |
2095 | /* We only create an OVERLOAD if there was a previous binding at | |
2096 | this level, or if decl is a template. In the former case, we | |
2097 | need to remove the old binding and replace it with the new | |
2098 | binding. We must also run through the NAMES on the binding | |
2099 | level where the name was bound to update the chain. */ | |
2100 | ||
2101 | if (TREE_CODE (new_binding) == OVERLOAD && old) | |
2102 | { | |
2103 | tree *d; | |
2104 | ||
2105 | for (d = &IDENTIFIER_BINDING (name)->scope->names; | |
2106 | *d; | |
2107 | d = &TREE_CHAIN (*d)) | |
2108 | if (*d == old | |
2109 | || (TREE_CODE (*d) == TREE_LIST | |
2110 | && TREE_VALUE (*d) == old)) | |
2111 | { | |
2112 | if (TREE_CODE (*d) == TREE_LIST) | |
2113 | /* Just replace the old binding with the new. */ | |
2114 | TREE_VALUE (*d) = new_binding; | |
2115 | else | |
2116 | /* Build a TREE_LIST to wrap the OVERLOAD. */ | |
2117 | *d = tree_cons (NULL_TREE, new_binding, | |
2118 | TREE_CHAIN (*d)); | |
2119 | ||
2120 | /* And update the cxx_binding node. */ | |
2121 | IDENTIFIER_BINDING (name)->value = new_binding; | |
2122 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
2123 | } | |
2124 | ||
2125 | /* We should always find a previous binding in this case. */ | |
315fb5db | 2126 | gcc_unreachable (); |
a5e6b29b GDR |
2127 | } |
2128 | ||
2129 | /* Install the new binding. */ | |
2130 | push_local_binding (name, new_binding, flags); | |
2131 | } | |
2132 | ||
2133 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
2134 | } | |
2135 | ||
5a167978 GDR |
2136 | /* Check a non-member using-declaration. Return the name and scope |
2137 | being used, and the USING_DECL, or NULL_TREE on failure. */ | |
2138 | ||
2139 | static tree | |
ed5f054f | 2140 | validate_nonmember_using_decl (tree decl, tree scope, tree name) |
5a167978 | 2141 | { |
7756db03 MM |
2142 | /* [namespace.udecl] |
2143 | A using-declaration for a class member shall be a | |
2144 | member-declaration. */ | |
2145 | if (TYPE_P (scope)) | |
2146 | { | |
2a13a625 | 2147 | error ("%qT is not a namespace", scope); |
7756db03 MM |
2148 | return NULL_TREE; |
2149 | } | |
2150 | else if (scope == error_mark_node) | |
2151 | return NULL_TREE; | |
2152 | ||
5a167978 GDR |
2153 | if (TREE_CODE (decl) == TEMPLATE_ID_EXPR) |
2154 | { | |
5a167978 GDR |
2155 | /* 7.3.3/5 |
2156 | A using-declaration shall not name a template-id. */ | |
2a13a625 | 2157 | error ("a using-declaration cannot specify a template-id. " |
0cbd7506 | 2158 | "Try %<using %D%>", name); |
5a167978 GDR |
2159 | return NULL_TREE; |
2160 | } | |
2161 | ||
2162 | if (TREE_CODE (decl) == NAMESPACE_DECL) | |
2163 | { | |
2a13a625 | 2164 | error ("namespace %qD not allowed in using-declaration", decl); |
5a167978 GDR |
2165 | return NULL_TREE; |
2166 | } | |
2167 | ||
2168 | if (TREE_CODE (decl) == SCOPE_REF) | |
2169 | { | |
2170 | /* It's a nested name with template parameter dependent scope. | |
2171 | This can only be using-declaration for class member. */ | |
2a13a625 | 2172 | error ("%qT is not a namespace", TREE_OPERAND (decl, 0)); |
5a167978 GDR |
2173 | return NULL_TREE; |
2174 | } | |
2175 | ||
2176 | if (is_overloaded_fn (decl)) | |
2177 | decl = get_first_fn (decl); | |
2178 | ||
50bc768d | 2179 | gcc_assert (DECL_P (decl)); |
5a167978 | 2180 | |
5a167978 | 2181 | /* Make a USING_DECL. */ |
ed5f054f | 2182 | return push_using_decl (scope, name); |
5a167978 GDR |
2183 | } |
2184 | ||
2185 | /* Process local and global using-declarations. */ | |
2186 | ||
2187 | static void | |
2188 | do_nonmember_using_decl (tree scope, tree name, tree oldval, tree oldtype, | |
0cbd7506 | 2189 | tree *newval, tree *newtype) |
5a167978 | 2190 | { |
15f8ac7f | 2191 | struct scope_binding decls = EMPTY_SCOPE_BINDING; |
5a167978 GDR |
2192 | |
2193 | *newval = *newtype = NULL_TREE; | |
5a167978 GDR |
2194 | if (!qualified_lookup_using_namespace (name, scope, &decls, 0)) |
2195 | /* Lookup error */ | |
2196 | return; | |
2197 | ||
2198 | if (!decls.value && !decls.type) | |
2199 | { | |
2a13a625 | 2200 | error ("%qD not declared", name); |
5a167978 GDR |
2201 | return; |
2202 | } | |
2203 | ||
44fd0e80 OW |
2204 | /* Shift the old and new bindings around so we're comparing class and |
2205 | enumeration names to each other. */ | |
2206 | if (oldval && DECL_IMPLICIT_TYPEDEF_P (oldval)) | |
2207 | { | |
2208 | oldtype = oldval; | |
2209 | oldval = NULL_TREE; | |
2210 | } | |
2211 | ||
2212 | if (decls.value && DECL_IMPLICIT_TYPEDEF_P (decls.value)) | |
2213 | { | |
2214 | decls.type = decls.value; | |
2215 | decls.value = NULL_TREE; | |
2216 | } | |
2217 | ||
d035c296 MM |
2218 | /* It is impossible to overload a built-in function; any explicit |
2219 | declaration eliminates the built-in declaration. So, if OLDVAL | |
2220 | is a built-in, then we can just pretend it isn't there. */ | |
c8094d83 | 2221 | if (oldval |
d035c296 | 2222 | && TREE_CODE (oldval) == FUNCTION_DECL |
d63d5d0c ILT |
2223 | && DECL_ANTICIPATED (oldval) |
2224 | && !DECL_HIDDEN_FRIEND_P (oldval)) | |
d035c296 MM |
2225 | oldval = NULL_TREE; |
2226 | ||
44fd0e80 | 2227 | if (decls.value) |
5a167978 | 2228 | { |
44fd0e80 OW |
2229 | /* Check for using functions. */ |
2230 | if (is_overloaded_fn (decls.value)) | |
5a167978 | 2231 | { |
44fd0e80 | 2232 | tree tmp, tmp1; |
5a167978 | 2233 | |
44fd0e80 OW |
2234 | if (oldval && !is_overloaded_fn (oldval)) |
2235 | { | |
2236 | error ("%qD is already declared in this scope", name); | |
2237 | oldval = NULL_TREE; | |
2238 | } | |
5a167978 | 2239 | |
44fd0e80 OW |
2240 | *newval = oldval; |
2241 | for (tmp = decls.value; tmp; tmp = OVL_NEXT (tmp)) | |
5a167978 | 2242 | { |
44fd0e80 OW |
2243 | tree new_fn = OVL_CURRENT (tmp); |
2244 | ||
2245 | /* [namespace.udecl] | |
2246 | ||
2247 | If a function declaration in namespace scope or block | |
2248 | scope has the same name and the same parameter types as a | |
2249 | function introduced by a using declaration the program is | |
2250 | ill-formed. */ | |
2251 | for (tmp1 = oldval; tmp1; tmp1 = OVL_NEXT (tmp1)) | |
5a167978 | 2252 | { |
44fd0e80 | 2253 | tree old_fn = OVL_CURRENT (tmp1); |
e3016344 | 2254 | |
44fd0e80 OW |
2255 | if (new_fn == old_fn) |
2256 | /* The function already exists in the current namespace. */ | |
e3016344 | 2257 | break; |
44fd0e80 OW |
2258 | else if (OVL_USED (tmp1)) |
2259 | continue; /* this is a using decl */ | |
2260 | else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (new_fn)), | |
2261 | TYPE_ARG_TYPES (TREE_TYPE (old_fn)))) | |
0cbd7506 | 2262 | { |
44fd0e80 OW |
2263 | gcc_assert (!DECL_ANTICIPATED (old_fn) |
2264 | || DECL_HIDDEN_FRIEND_P (old_fn)); | |
2265 | ||
2266 | /* There was already a non-using declaration in | |
2267 | this scope with the same parameter types. If both | |
2268 | are the same extern "C" functions, that's ok. */ | |
2269 | if (decls_match (new_fn, old_fn)) | |
2270 | break; | |
2271 | else | |
2272 | { | |
2273 | error ("%qD is already declared in this scope", name); | |
2274 | break; | |
2275 | } | |
5a167978 | 2276 | } |
5a167978 | 2277 | } |
5a167978 | 2278 | |
44fd0e80 OW |
2279 | /* If we broke out of the loop, there's no reason to add |
2280 | this function to the using declarations for this | |
2281 | scope. */ | |
2282 | if (tmp1) | |
2283 | continue; | |
2284 | ||
2285 | /* If we are adding to an existing OVERLOAD, then we no | |
2286 | longer know the type of the set of functions. */ | |
2287 | if (*newval && TREE_CODE (*newval) == OVERLOAD) | |
2288 | TREE_TYPE (*newval) = unknown_type_node; | |
2289 | /* Add this new function to the set. */ | |
2290 | *newval = build_overload (OVL_CURRENT (tmp), *newval); | |
2291 | /* If there is only one function, then we use its type. (A | |
2292 | using-declaration naming a single function can be used in | |
2293 | contexts where overload resolution cannot be | |
2294 | performed.) */ | |
2295 | if (TREE_CODE (*newval) != OVERLOAD) | |
2296 | { | |
2297 | *newval = ovl_cons (*newval, NULL_TREE); | |
2298 | TREE_TYPE (*newval) = TREE_TYPE (OVL_CURRENT (tmp)); | |
2299 | } | |
2300 | OVL_USED (*newval) = 1; | |
26bcf8fc | 2301 | } |
44fd0e80 OW |
2302 | } |
2303 | else | |
2304 | { | |
2305 | *newval = decls.value; | |
2306 | if (oldval && !decls_match (*newval, oldval)) | |
2307 | error ("%qD is already declared in this scope", name); | |
5a167978 GDR |
2308 | } |
2309 | } | |
c8094d83 | 2310 | else |
44fd0e80 | 2311 | *newval = oldval; |
5a167978 | 2312 | |
19831e2b | 2313 | if (decls.type && TREE_CODE (decls.type) == TREE_LIST) |
5a167978 | 2314 | { |
19831e2b OW |
2315 | error ("reference to %qD is ambiguous", name); |
2316 | print_candidates (decls.type); | |
2317 | } | |
2318 | else | |
2319 | { | |
2320 | *newtype = decls.type; | |
44fd0e80 OW |
2321 | if (oldtype && *newtype && !decls_match (oldtype, *newtype)) |
2322 | error ("%qD is already declared in this scope", name); | |
5a167978 | 2323 | } |
44fd0e80 OW |
2324 | |
2325 | /* If *newval is empty, shift any class or enumeration name down. */ | |
2326 | if (!*newval) | |
2327 | { | |
2328 | *newval = *newtype; | |
2329 | *newtype = NULL_TREE; | |
2330 | } | |
5a167978 GDR |
2331 | } |
2332 | ||
2333 | /* Process a using-declaration at function scope. */ | |
2334 | ||
2335 | void | |
ed5f054f | 2336 | do_local_using_decl (tree decl, tree scope, tree name) |
5a167978 | 2337 | { |
5a167978 | 2338 | tree oldval, oldtype, newval, newtype; |
6097b0c3 | 2339 | tree orig_decl = decl; |
5a167978 | 2340 | |
ed5f054f | 2341 | decl = validate_nonmember_using_decl (decl, scope, name); |
5a167978 GDR |
2342 | if (decl == NULL_TREE) |
2343 | return; | |
2344 | ||
2345 | if (building_stmt_tree () | |
2346 | && at_function_scope_p ()) | |
350fae66 | 2347 | add_decl_expr (decl); |
5a167978 | 2348 | |
461c6fce | 2349 | oldval = lookup_name_innermost_nonclass_level (name); |
5a167978 GDR |
2350 | oldtype = lookup_type_current_level (name); |
2351 | ||
2352 | do_nonmember_using_decl (scope, name, oldval, oldtype, &newval, &newtype); | |
2353 | ||
2354 | if (newval) | |
2355 | { | |
2356 | if (is_overloaded_fn (newval)) | |
2357 | { | |
2358 | tree fn, term; | |
2359 | ||
2360 | /* We only need to push declarations for those functions | |
2361 | that were not already bound in the current level. | |
2362 | The old value might be NULL_TREE, it might be a single | |
2363 | function, or an OVERLOAD. */ | |
2364 | if (oldval && TREE_CODE (oldval) == OVERLOAD) | |
2365 | term = OVL_FUNCTION (oldval); | |
2366 | else | |
2367 | term = oldval; | |
c8094d83 | 2368 | for (fn = newval; fn && OVL_CURRENT (fn) != term; |
5a167978 | 2369 | fn = OVL_NEXT (fn)) |
c8094d83 | 2370 | push_overloaded_decl (OVL_CURRENT (fn), |
d63d5d0c ILT |
2371 | PUSH_LOCAL | PUSH_USING, |
2372 | false); | |
5a167978 GDR |
2373 | } |
2374 | else | |
2375 | push_local_binding (name, newval, PUSH_USING); | |
2376 | } | |
2377 | if (newtype) | |
4546865e MM |
2378 | { |
2379 | push_local_binding (name, newtype, PUSH_USING); | |
2380 | set_identifier_type_value (name, newtype); | |
2381 | } | |
6097b0c3 DP |
2382 | |
2383 | /* Emit debug info. */ | |
2384 | if (!processing_template_decl) | |
2385 | cp_emit_debug_info_for_using (orig_decl, current_scope()); | |
5a167978 GDR |
2386 | } |
2387 | ||
5a167978 GDR |
2388 | /* Returns true if ROOT (a namespace, class, or function) encloses |
2389 | CHILD. CHILD may be either a class type or a namespace. */ | |
2390 | ||
2391 | bool | |
2392 | is_ancestor (tree root, tree child) | |
2393 | { | |
50bc768d NS |
2394 | gcc_assert ((TREE_CODE (root) == NAMESPACE_DECL |
2395 | || TREE_CODE (root) == FUNCTION_DECL | |
2396 | || CLASS_TYPE_P (root))); | |
2397 | gcc_assert ((TREE_CODE (child) == NAMESPACE_DECL | |
2398 | || CLASS_TYPE_P (child))); | |
c8094d83 | 2399 | |
5a167978 GDR |
2400 | /* The global namespace encloses everything. */ |
2401 | if (root == global_namespace) | |
2402 | return true; | |
2403 | ||
2404 | while (true) | |
2405 | { | |
2406 | /* If we've run out of scopes, stop. */ | |
2407 | if (!child) | |
2408 | return false; | |
2409 | /* If we've reached the ROOT, it encloses CHILD. */ | |
2410 | if (root == child) | |
2411 | return true; | |
2412 | /* Go out one level. */ | |
2413 | if (TYPE_P (child)) | |
2414 | child = TYPE_NAME (child); | |
2415 | child = DECL_CONTEXT (child); | |
2416 | } | |
2417 | } | |
2418 | ||
4514aa8c NS |
2419 | /* Enter the class or namespace scope indicated by T suitable for name |
2420 | lookup. T can be arbitrary scope, not necessary nested inside the | |
2421 | current scope. Returns a non-null scope to pop iff pop_scope | |
2422 | should be called later to exit this scope. */ | |
5a167978 | 2423 | |
4514aa8c | 2424 | tree |
5a167978 GDR |
2425 | push_scope (tree t) |
2426 | { | |
2427 | if (TREE_CODE (t) == NAMESPACE_DECL) | |
2428 | push_decl_namespace (t); | |
91b004e5 MM |
2429 | else if (CLASS_TYPE_P (t)) |
2430 | { | |
2431 | if (!at_class_scope_p () | |
2432 | || !same_type_p (current_class_type, t)) | |
2433 | push_nested_class (t); | |
2434 | else | |
2435 | /* T is the same as the current scope. There is therefore no | |
2436 | need to re-enter the scope. Since we are not actually | |
2437 | pushing a new scope, our caller should not call | |
2438 | pop_scope. */ | |
4514aa8c | 2439 | t = NULL_TREE; |
91b004e5 MM |
2440 | } |
2441 | ||
4514aa8c | 2442 | return t; |
5a167978 GDR |
2443 | } |
2444 | ||
2445 | /* Leave scope pushed by push_scope. */ | |
2446 | ||
2447 | void | |
2448 | pop_scope (tree t) | |
2449 | { | |
2450 | if (TREE_CODE (t) == NAMESPACE_DECL) | |
2451 | pop_decl_namespace (); | |
2452 | else if CLASS_TYPE_P (t) | |
2453 | pop_nested_class (); | |
2454 | } | |
87c465f5 KL |
2455 | |
2456 | /* Subroutine of push_inner_scope. */ | |
2457 | ||
2458 | static void | |
2459 | push_inner_scope_r (tree outer, tree inner) | |
2460 | { | |
2461 | tree prev; | |
2462 | ||
2463 | if (outer == inner | |
2464 | || (TREE_CODE (inner) != NAMESPACE_DECL && !CLASS_TYPE_P (inner))) | |
2465 | return; | |
2466 | ||
2467 | prev = CP_DECL_CONTEXT (TREE_CODE (inner) == NAMESPACE_DECL ? inner : TYPE_NAME (inner)); | |
2468 | if (outer != prev) | |
2469 | push_inner_scope_r (outer, prev); | |
2470 | if (TREE_CODE (inner) == NAMESPACE_DECL) | |
2471 | { | |
2472 | struct cp_binding_level *save_template_parm = 0; | |
2473 | /* Temporary take out template parameter scopes. They are saved | |
2474 | in reversed order in save_template_parm. */ | |
2475 | while (current_binding_level->kind == sk_template_parms) | |
2476 | { | |
2477 | struct cp_binding_level *b = current_binding_level; | |
2478 | current_binding_level = b->level_chain; | |
2479 | b->level_chain = save_template_parm; | |
2480 | save_template_parm = b; | |
2481 | } | |
2482 | ||
2483 | resume_scope (NAMESPACE_LEVEL (inner)); | |
2484 | current_namespace = inner; | |
2485 | ||
2486 | /* Restore template parameter scopes. */ | |
2487 | while (save_template_parm) | |
2488 | { | |
2489 | struct cp_binding_level *b = save_template_parm; | |
2490 | save_template_parm = b->level_chain; | |
2491 | b->level_chain = current_binding_level; | |
2492 | current_binding_level = b; | |
2493 | } | |
2494 | } | |
2495 | else | |
2496 | pushclass (inner); | |
2497 | } | |
2498 | ||
2499 | /* Enter the scope INNER from current scope. INNER must be a scope | |
2500 | nested inside current scope. This works with both name lookup and | |
2501 | pushing name into scope. In case a template parameter scope is present, | |
2502 | namespace is pushed under the template parameter scope according to | |
2503 | name lookup rule in 14.6.1/6. | |
c8094d83 | 2504 | |
87c465f5 KL |
2505 | Return the former current scope suitable for pop_inner_scope. */ |
2506 | ||
2507 | tree | |
2508 | push_inner_scope (tree inner) | |
2509 | { | |
2510 | tree outer = current_scope (); | |
2511 | if (!outer) | |
2512 | outer = current_namespace; | |
2513 | ||
2514 | push_inner_scope_r (outer, inner); | |
2515 | return outer; | |
2516 | } | |
2517 | ||
2518 | /* Exit the current scope INNER back to scope OUTER. */ | |
2519 | ||
2520 | void | |
2521 | pop_inner_scope (tree outer, tree inner) | |
2522 | { | |
2523 | if (outer == inner | |
2524 | || (TREE_CODE (inner) != NAMESPACE_DECL && !CLASS_TYPE_P (inner))) | |
2525 | return; | |
2526 | ||
2527 | while (outer != inner) | |
2528 | { | |
2529 | if (TREE_CODE (inner) == NAMESPACE_DECL) | |
2530 | { | |
2531 | struct cp_binding_level *save_template_parm = 0; | |
2532 | /* Temporary take out template parameter scopes. They are saved | |
2533 | in reversed order in save_template_parm. */ | |
2534 | while (current_binding_level->kind == sk_template_parms) | |
2535 | { | |
2536 | struct cp_binding_level *b = current_binding_level; | |
2537 | current_binding_level = b->level_chain; | |
2538 | b->level_chain = save_template_parm; | |
2539 | save_template_parm = b; | |
2540 | } | |
2541 | ||
2542 | pop_namespace (); | |
2543 | ||
2544 | /* Restore template parameter scopes. */ | |
2545 | while (save_template_parm) | |
2546 | { | |
2547 | struct cp_binding_level *b = save_template_parm; | |
2548 | save_template_parm = b->level_chain; | |
2549 | b->level_chain = current_binding_level; | |
2550 | current_binding_level = b; | |
2551 | } | |
2552 | } | |
2553 | else | |
2554 | popclass (); | |
2555 | ||
2556 | inner = CP_DECL_CONTEXT (TREE_CODE (inner) == NAMESPACE_DECL ? inner : TYPE_NAME (inner)); | |
2557 | } | |
2558 | } | |
00e8de68 GDR |
2559 | \f |
2560 | /* Do a pushlevel for class declarations. */ | |
2561 | ||
2562 | void | |
2563 | pushlevel_class (void) | |
2564 | { | |
2565 | if (ENABLE_SCOPE_CHECKING) | |
2566 | is_class_level = 1; | |
2567 | ||
2568 | class_binding_level = begin_scope (sk_class, current_class_type); | |
2569 | } | |
2570 | ||
2571 | /* ...and a poplevel for class declarations. */ | |
2572 | ||
2573 | void | |
2574 | poplevel_class (void) | |
2575 | { | |
926ce8bd | 2576 | struct cp_binding_level *level = class_binding_level; |
89b578be MM |
2577 | cp_class_binding *cb; |
2578 | size_t i; | |
00e8de68 GDR |
2579 | tree shadowed; |
2580 | ||
2581 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d | 2582 | gcc_assert (level != 0); |
00e8de68 | 2583 | |
39fb05d0 MM |
2584 | /* If we're leaving a toplevel class, cache its binding level. */ |
2585 | if (current_class_depth == 1) | |
89b578be | 2586 | previous_class_level = level; |
00e8de68 GDR |
2587 | for (shadowed = level->type_shadowed; |
2588 | shadowed; | |
2589 | shadowed = TREE_CHAIN (shadowed)) | |
2590 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (shadowed), TREE_VALUE (shadowed)); | |
2591 | ||
2592 | /* Remove the bindings for all of the class-level declarations. */ | |
90ea9897 MM |
2593 | if (level->class_shadowed) |
2594 | { | |
2595 | for (i = 0; | |
9ba5ff0f | 2596 | VEC_iterate (cp_class_binding, level->class_shadowed, i, cb); |
90ea9897 MM |
2597 | ++i) |
2598 | IDENTIFIER_BINDING (cb->identifier) = cb->base.previous; | |
2599 | ggc_free (level->class_shadowed); | |
2600 | level->class_shadowed = NULL; | |
2601 | } | |
00e8de68 GDR |
2602 | |
2603 | /* Now, pop out of the binding level which we created up in the | |
2604 | `pushlevel_class' routine. */ | |
2605 | if (ENABLE_SCOPE_CHECKING) | |
2606 | is_class_level = 1; | |
2607 | ||
2608 | leave_scope (); | |
2609 | timevar_pop (TV_NAME_LOOKUP); | |
2610 | } | |
2611 | ||
90ea9897 MM |
2612 | /* Set INHERITED_VALUE_BINDING_P on BINDING to true or false, as |
2613 | appropriate. DECL is the value to which a name has just been | |
df05a794 | 2614 | bound. CLASS_TYPE is the class in which the lookup occurred. */ |
00e8de68 | 2615 | |
90ea9897 | 2616 | static void |
df05a794 MM |
2617 | set_inherited_value_binding_p (cxx_binding *binding, tree decl, |
2618 | tree class_type) | |
00e8de68 | 2619 | { |
00e8de68 GDR |
2620 | if (binding->value == decl && TREE_CODE (decl) != TREE_LIST) |
2621 | { | |
90ea9897 MM |
2622 | tree context; |
2623 | ||
00e8de68 GDR |
2624 | if (TREE_CODE (decl) == OVERLOAD) |
2625 | context = CP_DECL_CONTEXT (OVL_CURRENT (decl)); | |
2626 | else | |
2627 | { | |
50bc768d | 2628 | gcc_assert (DECL_P (decl)); |
00e8de68 GDR |
2629 | context = context_for_name_lookup (decl); |
2630 | } | |
2631 | ||
df05a794 | 2632 | if (is_properly_derived_from (class_type, context)) |
00e8de68 GDR |
2633 | INHERITED_VALUE_BINDING_P (binding) = 1; |
2634 | else | |
2635 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
2636 | } | |
2637 | else if (binding->value == decl) | |
90ea9897 MM |
2638 | /* We only encounter a TREE_LIST when there is an ambiguity in the |
2639 | base classes. Such an ambiguity can be overridden by a | |
2640 | definition in this class. */ | |
00e8de68 | 2641 | INHERITED_VALUE_BINDING_P (binding) = 1; |
90ea9897 MM |
2642 | else |
2643 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
00e8de68 GDR |
2644 | } |
2645 | ||
00e8de68 GDR |
2646 | /* Make the declaration of X appear in CLASS scope. */ |
2647 | ||
2648 | bool | |
2649 | pushdecl_class_level (tree x) | |
2650 | { | |
2651 | tree name; | |
2652 | bool is_valid = true; | |
2653 | ||
2654 | timevar_push (TV_NAME_LOOKUP); | |
2655 | /* Get the name of X. */ | |
2656 | if (TREE_CODE (x) == OVERLOAD) | |
2657 | name = DECL_NAME (get_first_fn (x)); | |
2658 | else | |
2659 | name = DECL_NAME (x); | |
2660 | ||
2661 | if (name) | |
2662 | { | |
2663 | is_valid = push_class_level_binding (name, x); | |
2664 | if (TREE_CODE (x) == TYPE_DECL) | |
2665 | set_identifier_type_value (name, x); | |
2666 | } | |
2667 | else if (ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2668 | { | |
2669 | /* If X is an anonymous aggregate, all of its members are | |
2670 | treated as if they were members of the class containing the | |
2671 | aggregate, for naming purposes. */ | |
2672 | tree f; | |
2673 | ||
2674 | for (f = TYPE_FIELDS (TREE_TYPE (x)); f; f = TREE_CHAIN (f)) | |
2675 | { | |
2676 | location_t save_location = input_location; | |
2677 | input_location = DECL_SOURCE_LOCATION (f); | |
2678 | if (!pushdecl_class_level (f)) | |
2679 | is_valid = false; | |
2680 | input_location = save_location; | |
2681 | } | |
2682 | } | |
be99edf8 | 2683 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, is_valid); |
00e8de68 GDR |
2684 | } |
2685 | ||
90ea9897 MM |
2686 | /* Return the BINDING (if any) for NAME in SCOPE, which is a class |
2687 | scope. If the value returned is non-NULL, and the PREVIOUS field | |
2688 | is not set, callers must set the PREVIOUS field explicitly. */ | |
2689 | ||
2690 | static cxx_binding * | |
2691 | get_class_binding (tree name, cxx_scope *scope) | |
2692 | { | |
2693 | tree class_type; | |
2694 | tree type_binding; | |
2695 | tree value_binding; | |
2696 | cxx_binding *binding; | |
2697 | ||
2698 | class_type = scope->this_entity; | |
2699 | ||
2700 | /* Get the type binding. */ | |
2701 | type_binding = lookup_member (class_type, name, | |
2702 | /*protect=*/2, /*want_type=*/true); | |
2703 | /* Get the value binding. */ | |
2704 | value_binding = lookup_member (class_type, name, | |
2705 | /*protect=*/2, /*want_type=*/false); | |
2706 | ||
2707 | if (value_binding | |
2708 | && (TREE_CODE (value_binding) == TYPE_DECL | |
2709 | || DECL_CLASS_TEMPLATE_P (value_binding) | |
2710 | || (TREE_CODE (value_binding) == TREE_LIST | |
2711 | && TREE_TYPE (value_binding) == error_mark_node | |
2712 | && (TREE_CODE (TREE_VALUE (value_binding)) | |
2713 | == TYPE_DECL)))) | |
2714 | /* We found a type binding, even when looking for a non-type | |
2715 | binding. This means that we already processed this binding | |
2716 | above. */ | |
2717 | ; | |
2718 | else if (value_binding) | |
2719 | { | |
c8094d83 | 2720 | if (TREE_CODE (value_binding) == TREE_LIST |
90ea9897 MM |
2721 | && TREE_TYPE (value_binding) == error_mark_node) |
2722 | /* NAME is ambiguous. */ | |
2723 | ; | |
2724 | else if (BASELINK_P (value_binding)) | |
2725 | /* NAME is some overloaded functions. */ | |
2726 | value_binding = BASELINK_FUNCTIONS (value_binding); | |
2727 | } | |
2728 | ||
2729 | /* If we found either a type binding or a value binding, create a | |
2730 | new binding object. */ | |
2731 | if (type_binding || value_binding) | |
2732 | { | |
c8094d83 MS |
2733 | binding = new_class_binding (name, |
2734 | value_binding, | |
90ea9897 MM |
2735 | type_binding, |
2736 | scope); | |
2737 | /* This is a class-scope binding, not a block-scope binding. */ | |
2738 | LOCAL_BINDING_P (binding) = 0; | |
df05a794 | 2739 | set_inherited_value_binding_p (binding, value_binding, class_type); |
90ea9897 MM |
2740 | } |
2741 | else | |
2742 | binding = NULL; | |
2743 | ||
2744 | return binding; | |
2745 | } | |
c8094d83 | 2746 | |
00e8de68 GDR |
2747 | /* Make the declaration(s) of X appear in CLASS scope under the name |
2748 | NAME. Returns true if the binding is valid. */ | |
2749 | ||
2750 | bool | |
2751 | push_class_level_binding (tree name, tree x) | |
2752 | { | |
2753 | cxx_binding *binding; | |
90ea9897 MM |
2754 | tree decl = x; |
2755 | bool ok; | |
00e8de68 GDR |
2756 | |
2757 | timevar_push (TV_NAME_LOOKUP); | |
2758 | /* The class_binding_level will be NULL if x is a template | |
2759 | parameter name in a member template. */ | |
2760 | if (!class_binding_level) | |
2761 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
2762 | ||
0fdc23b9 LM |
2763 | if (name == error_mark_node) |
2764 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
2765 | ||
90ea9897 | 2766 | /* Check for invalid member names. */ |
50bc768d | 2767 | gcc_assert (TYPE_BEING_DEFINED (current_class_type)); |
90ea9897 MM |
2768 | /* We could have been passed a tree list if this is an ambiguous |
2769 | declaration. If so, pull the declaration out because | |
03fd3f84 | 2770 | check_template_shadow will not handle a TREE_LIST. */ |
c8094d83 | 2771 | if (TREE_CODE (decl) == TREE_LIST |
90ea9897 MM |
2772 | && TREE_TYPE (decl) == error_mark_node) |
2773 | decl = TREE_VALUE (decl); | |
ece95d90 | 2774 | |
157b0647 PC |
2775 | if (!check_template_shadow (decl)) |
2776 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
00e8de68 | 2777 | |
90ea9897 | 2778 | /* [class.mem] |
d2f2c87b | 2779 | |
90ea9897 MM |
2780 | If T is the name of a class, then each of the following shall |
2781 | have a name different from T: | |
d2f2c87b | 2782 | |
90ea9897 | 2783 | -- every static data member of class T; |
d2f2c87b | 2784 | |
90ea9897 | 2785 | -- every member of class T that is itself a type; |
d2f2c87b | 2786 | |
90ea9897 MM |
2787 | -- every enumerator of every member of class T that is an |
2788 | enumerated type; | |
d2f2c87b | 2789 | |
90ea9897 MM |
2790 | -- every member of every anonymous union that is a member of |
2791 | class T. | |
d2f2c87b | 2792 | |
90ea9897 MM |
2793 | (Non-static data members were also forbidden to have the same |
2794 | name as T until TC1.) */ | |
2795 | if ((TREE_CODE (x) == VAR_DECL | |
2796 | || TREE_CODE (x) == CONST_DECL | |
2797 | || (TREE_CODE (x) == TYPE_DECL | |
2798 | && !DECL_SELF_REFERENCE_P (x)) | |
2799 | /* A data member of an anonymous union. */ | |
2800 | || (TREE_CODE (x) == FIELD_DECL | |
2801 | && DECL_CONTEXT (x) != current_class_type)) | |
2802 | && DECL_NAME (x) == constructor_name (current_class_type)) | |
2803 | { | |
2804 | tree scope = context_for_name_lookup (x); | |
2805 | if (TYPE_P (scope) && same_type_p (scope, current_class_type)) | |
a6567a0f | 2806 | { |
2a13a625 | 2807 | error ("%qD has the same name as the class in which it is " |
90ea9897 MM |
2808 | "declared", |
2809 | x); | |
2810 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, false); | |
a6567a0f | 2811 | } |
d2f2c87b MM |
2812 | } |
2813 | ||
90ea9897 | 2814 | /* Get the current binding for NAME in this class, if any. */ |
00e8de68 | 2815 | binding = IDENTIFIER_BINDING (name); |
90ea9897 MM |
2816 | if (!binding || binding->scope != class_binding_level) |
2817 | { | |
2818 | binding = get_class_binding (name, class_binding_level); | |
2819 | /* If a new binding was created, put it at the front of the | |
2820 | IDENTIFIER_BINDING list. */ | |
2821 | if (binding) | |
2822 | { | |
2823 | binding->previous = IDENTIFIER_BINDING (name); | |
2824 | IDENTIFIER_BINDING (name) = binding; | |
2825 | } | |
2826 | } | |
2827 | ||
2828 | /* If there is already a binding, then we may need to update the | |
2829 | current value. */ | |
00e8de68 GDR |
2830 | if (binding && binding->value) |
2831 | { | |
2832 | tree bval = binding->value; | |
2833 | tree old_decl = NULL_TREE; | |
2834 | ||
2835 | if (INHERITED_VALUE_BINDING_P (binding)) | |
2836 | { | |
2837 | /* If the old binding was from a base class, and was for a | |
0cbd7506 MS |
2838 | tag name, slide it over to make room for the new binding. |
2839 | The old binding is still visible if explicitly qualified | |
2840 | with a class-key. */ | |
00e8de68 GDR |
2841 | if (TREE_CODE (bval) == TYPE_DECL && DECL_ARTIFICIAL (bval) |
2842 | && !(TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x))) | |
2843 | { | |
2844 | old_decl = binding->type; | |
2845 | binding->type = bval; | |
2846 | binding->value = NULL_TREE; | |
2847 | INHERITED_VALUE_BINDING_P (binding) = 0; | |
2848 | } | |
2849 | else | |
862e1e62 MM |
2850 | { |
2851 | old_decl = bval; | |
2852 | /* Any inherited type declaration is hidden by the type | |
2853 | declaration in the derived class. */ | |
2854 | if (TREE_CODE (x) == TYPE_DECL && DECL_ARTIFICIAL (x)) | |
2855 | binding->type = NULL_TREE; | |
2856 | } | |
00e8de68 GDR |
2857 | } |
2858 | else if (TREE_CODE (x) == OVERLOAD && is_overloaded_fn (bval)) | |
2859 | old_decl = bval; | |
2860 | else if (TREE_CODE (x) == USING_DECL && TREE_CODE (bval) == USING_DECL) | |
2861 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
2862 | else if (TREE_CODE (x) == USING_DECL && is_overloaded_fn (bval)) | |
2863 | old_decl = bval; | |
2864 | else if (TREE_CODE (bval) == USING_DECL && is_overloaded_fn (x)) | |
2865 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); | |
89b578be | 2866 | |
90ea9897 | 2867 | if (old_decl && binding->scope == class_binding_level) |
00e8de68 | 2868 | { |
f31045fd MM |
2869 | binding->value = x; |
2870 | /* It is always safe to clear INHERITED_VALUE_BINDING_P | |
df05a794 MM |
2871 | here. This function is only used to register bindings |
2872 | from with the class definition itself. */ | |
f31045fd | 2873 | INHERITED_VALUE_BINDING_P (binding) = 0; |
f31045fd | 2874 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, true); |
00e8de68 GDR |
2875 | } |
2876 | } | |
2877 | ||
90ea9897 MM |
2878 | /* Note that we declared this value so that we can issue an error if |
2879 | this is an invalid redeclaration of a name already used for some | |
2880 | other purpose. */ | |
2881 | note_name_declared_in_class (name, decl); | |
2882 | ||
00e8de68 | 2883 | /* If we didn't replace an existing binding, put the binding on the |
90ea9897 MM |
2884 | stack of bindings for the identifier, and update the shadowed |
2885 | list. */ | |
2886 | if (binding && binding->scope == class_binding_level) | |
2887 | /* Supplement the existing binding. */ | |
2888 | ok = supplement_binding (binding, decl); | |
2889 | else | |
2890 | { | |
2891 | /* Create a new binding. */ | |
2892 | push_binding (name, decl, class_binding_level); | |
2893 | ok = true; | |
2894 | } | |
00e8de68 | 2895 | |
90ea9897 | 2896 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ok); |
00e8de68 GDR |
2897 | } |
2898 | ||
1d786913 MM |
2899 | /* Process "using SCOPE::NAME" in a class scope. Return the |
2900 | USING_DECL created. */ | |
2901 | ||
5a167978 | 2902 | tree |
1d786913 | 2903 | do_class_using_decl (tree scope, tree name) |
5a167978 | 2904 | { |
577b02d8 MM |
2905 | /* The USING_DECL returned by this function. */ |
2906 | tree value; | |
2907 | /* The declaration (or declarations) name by this using | |
2908 | declaration. NULL if we are in a template and cannot figure out | |
2909 | what has been named. */ | |
2910 | tree decl; | |
2911 | /* True if SCOPE is a dependent type. */ | |
2912 | bool scope_dependent_p; | |
2913 | /* True if SCOPE::NAME is dependent. */ | |
2914 | bool name_dependent_p; | |
2915 | /* True if any of the bases of CURRENT_CLASS_TYPE are dependent. */ | |
2916 | bool bases_dependent_p; | |
2917 | tree binfo; | |
2918 | tree base_binfo; | |
2919 | int i; | |
c8094d83 | 2920 | |
0fdc23b9 LM |
2921 | if (name == error_mark_node) |
2922 | return NULL_TREE; | |
2923 | ||
1d786913 | 2924 | if (!scope || !TYPE_P (scope)) |
5a167978 GDR |
2925 | { |
2926 | error ("using-declaration for non-member at class scope"); | |
2927 | return NULL_TREE; | |
2928 | } | |
98ed9dae | 2929 | |
98ed9dae | 2930 | /* Make sure the name is not invalid */ |
5a167978 GDR |
2931 | if (TREE_CODE (name) == BIT_NOT_EXPR) |
2932 | { | |
98ed9dae NS |
2933 | error ("%<%T::%D%> names destructor", scope, name); |
2934 | return NULL_TREE; | |
2935 | } | |
9e1e64ec | 2936 | if (MAYBE_CLASS_TYPE_P (scope) && constructor_name_p (name, scope)) |
98ed9dae NS |
2937 | { |
2938 | error ("%<%T::%D%> names constructor", scope, name); | |
2939 | return NULL_TREE; | |
2940 | } | |
2941 | if (constructor_name_p (name, current_class_type)) | |
2942 | { | |
2943 | error ("%<%T::%D%> names constructor in %qT", | |
2944 | scope, name, current_class_type); | |
5a167978 GDR |
2945 | return NULL_TREE; |
2946 | } | |
5a167978 | 2947 | |
577b02d8 | 2948 | scope_dependent_p = dependent_type_p (scope); |
3db45ab5 | 2949 | name_dependent_p = (scope_dependent_p |
82d6b018 | 2950 | || (IDENTIFIER_TYPENAME_P (name) |
577b02d8 | 2951 | && dependent_type_p (TREE_TYPE (name)))); |
6097b0c3 | 2952 | |
577b02d8 MM |
2953 | bases_dependent_p = false; |
2954 | if (processing_template_decl) | |
2955 | for (binfo = TYPE_BINFO (current_class_type), i = 0; | |
3db45ab5 | 2956 | BINFO_BASE_ITERATE (binfo, i, base_binfo); |
577b02d8 MM |
2957 | i++) |
2958 | if (dependent_type_p (TREE_TYPE (base_binfo))) | |
2959 | { | |
2960 | bases_dependent_p = true; | |
2961 | break; | |
2962 | } | |
2963 | ||
2964 | decl = NULL_TREE; | |
2965 | ||
2966 | /* From [namespace.udecl]: | |
c8094d83 | 2967 | |
577b02d8 | 2968 | A using-declaration used as a member-declaration shall refer to a |
3db45ab5 MS |
2969 | member of a base class of the class being defined. |
2970 | ||
577b02d8 MM |
2971 | In general, we cannot check this constraint in a template because |
2972 | we do not know the entire set of base classes of the current | |
2973 | class type. However, if all of the base classes are | |
2974 | non-dependent, then we can avoid delaying the check until | |
2975 | instantiation. */ | |
b01e6d2b | 2976 | if (!scope_dependent_p) |
577b02d8 MM |
2977 | { |
2978 | base_kind b_kind; | |
577b02d8 MM |
2979 | binfo = lookup_base (current_class_type, scope, ba_any, &b_kind); |
2980 | if (b_kind < bk_proper_base) | |
98ed9dae | 2981 | { |
b01e6d2b JM |
2982 | if (!bases_dependent_p) |
2983 | { | |
2984 | error_not_base_type (scope, current_class_type); | |
2985 | return NULL_TREE; | |
2986 | } | |
98ed9dae | 2987 | } |
b01e6d2b | 2988 | else if (!name_dependent_p) |
577b02d8 MM |
2989 | { |
2990 | decl = lookup_member (binfo, name, 0, false); | |
2991 | if (!decl) | |
2992 | { | |
3db45ab5 | 2993 | error ("no members matching %<%T::%D%> in %q#T", scope, name, |
577b02d8 MM |
2994 | scope); |
2995 | return NULL_TREE; | |
2996 | } | |
2997 | /* The binfo from which the functions came does not matter. */ | |
2998 | if (BASELINK_P (decl)) | |
2999 | decl = BASELINK_FUNCTIONS (decl); | |
3000 | } | |
98ed9dae | 3001 | } |
98ed9dae NS |
3002 | |
3003 | value = build_lang_decl (USING_DECL, name, NULL_TREE); | |
3004 | USING_DECL_DECLS (value) = decl; | |
3005 | USING_DECL_SCOPE (value) = scope; | |
577b02d8 | 3006 | DECL_DEPENDENT_P (value) = !decl; |
6097b0c3 | 3007 | |
5a167978 GDR |
3008 | return value; |
3009 | } | |
3010 | ||
00e8de68 GDR |
3011 | \f |
3012 | /* Return the binding value for name in scope. */ | |
3013 | ||
3014 | tree | |
3015 | namespace_binding (tree name, tree scope) | |
3016 | { | |
3017 | cxx_binding *binding; | |
3018 | ||
3019 | if (scope == NULL) | |
3020 | scope = global_namespace; | |
8245c194 MA |
3021 | else |
3022 | /* Unnecessary for the global namespace because it can't be an alias. */ | |
3023 | scope = ORIGINAL_NAMESPACE (scope); | |
3024 | ||
00e8de68 GDR |
3025 | binding = cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); |
3026 | ||
3027 | return binding ? binding->value : NULL_TREE; | |
3028 | } | |
3029 | ||
3030 | /* Set the binding value for name in scope. */ | |
ed3cf953 GDR |
3031 | |
3032 | void | |
3033 | set_namespace_binding (tree name, tree scope, tree val) | |
3034 | { | |
3035 | cxx_binding *b; | |
3036 | ||
3037 | timevar_push (TV_NAME_LOOKUP); | |
3038 | if (scope == NULL_TREE) | |
3039 | scope = global_namespace; | |
3040 | b = binding_for_name (NAMESPACE_LEVEL (scope), name); | |
3c28fc74 | 3041 | if (!b->value || TREE_CODE (val) == OVERLOAD || val == error_mark_node) |
147135cc | 3042 | b->value = val; |
4b0d3cbe | 3043 | else |
c87ceb13 | 3044 | supplement_binding (b, val); |
ed3cf953 GDR |
3045 | timevar_pop (TV_NAME_LOOKUP); |
3046 | } | |
3047 | ||
5a167978 GDR |
3048 | /* Set the context of a declaration to scope. Complain if we are not |
3049 | outside scope. */ | |
3050 | ||
3051 | void | |
3052 | set_decl_namespace (tree decl, tree scope, bool friendp) | |
3053 | { | |
664a90c0 | 3054 | tree old, fn; |
c8094d83 | 3055 | |
5a167978 GDR |
3056 | /* Get rid of namespace aliases. */ |
3057 | scope = ORIGINAL_NAMESPACE (scope); | |
c8094d83 | 3058 | |
5a167978 GDR |
3059 | /* It is ok for friends to be qualified in parallel space. */ |
3060 | if (!friendp && !is_ancestor (current_namespace, scope)) | |
c4f73174 | 3061 | error ("declaration of %qD not in a namespace surrounding %qD", |
0cbd7506 | 3062 | decl, scope); |
5a167978 | 3063 | DECL_CONTEXT (decl) = FROB_CONTEXT (scope); |
5ae9ba3e | 3064 | |
c8094d83 MS |
3065 | /* Writing "int N::i" to declare a variable within "N" is invalid. */ |
3066 | if (scope == current_namespace) | |
5ae9ba3e MM |
3067 | { |
3068 | if (at_namespace_scope_p ()) | |
c85ce869 | 3069 | error ("explicit qualification in declaration of %qD", |
5ae9ba3e MM |
3070 | decl); |
3071 | return; | |
5a167978 | 3072 | } |
5ae9ba3e MM |
3073 | |
3074 | /* See whether this has been declared in the namespace. */ | |
664a90c0 | 3075 | old = lookup_qualified_name (scope, DECL_NAME (decl), false, true); |
97dc8e5b | 3076 | if (old == error_mark_node) |
5ae9ba3e MM |
3077 | /* No old declaration at all. */ |
3078 | goto complain; | |
5ae9ba3e MM |
3079 | if (!is_overloaded_fn (decl)) |
3080 | /* Don't compare non-function decls with decls_match here, since | |
3081 | it can't check for the correct constness at this | |
3082 | point. pushdecl will find those errors later. */ | |
3083 | return; | |
3084 | /* Since decl is a function, old should contain a function decl. */ | |
3085 | if (!is_overloaded_fn (old)) | |
3086 | goto complain; | |
664a90c0 | 3087 | fn = OVL_CURRENT (old); |
08d295c5 | 3088 | if (!is_associated_namespace (scope, CP_DECL_CONTEXT (fn))) |
664a90c0 JM |
3089 | goto complain; |
3090 | /* A template can be explicitly specialized in any namespace. */ | |
3091 | if (processing_explicit_instantiation) | |
3092 | return; | |
5ae9ba3e MM |
3093 | if (processing_template_decl || processing_specialization) |
3094 | /* We have not yet called push_template_decl to turn a | |
3095 | FUNCTION_DECL into a TEMPLATE_DECL, so the declarations won't | |
3096 | match. But, we'll check later, when we construct the | |
3097 | template. */ | |
5a167978 | 3098 | return; |
abc088aa MM |
3099 | /* Instantiations or specializations of templates may be declared as |
3100 | friends in any namespace. */ | |
3101 | if (friendp && DECL_USE_TEMPLATE (decl)) | |
3102 | return; | |
5ae9ba3e MM |
3103 | if (is_overloaded_fn (old)) |
3104 | { | |
3105 | for (; old; old = OVL_NEXT (old)) | |
3106 | if (decls_match (decl, OVL_CURRENT (old))) | |
3107 | return; | |
3108 | } | |
3109 | else if (decls_match (decl, old)) | |
3110 | return; | |
5a167978 | 3111 | complain: |
2a13a625 | 3112 | error ("%qD should have been declared inside %qD", decl, scope); |
c8094d83 | 3113 | } |
5a167978 GDR |
3114 | |
3115 | /* Return the namespace where the current declaration is declared. */ | |
3116 | ||
b8c1703b | 3117 | static tree |
5a167978 GDR |
3118 | current_decl_namespace (void) |
3119 | { | |
3120 | tree result; | |
3121 | /* If we have been pushed into a different namespace, use it. */ | |
3122 | if (decl_namespace_list) | |
3123 | return TREE_PURPOSE (decl_namespace_list); | |
3124 | ||
3125 | if (current_class_type) | |
b1cc95ce | 3126 | result = decl_namespace_context (current_class_type); |
5a167978 | 3127 | else if (current_function_decl) |
b1cc95ce | 3128 | result = decl_namespace_context (current_function_decl); |
c8094d83 | 3129 | else |
5a167978 GDR |
3130 | result = current_namespace; |
3131 | return result; | |
3132 | } | |
3133 | ||
65567efa JM |
3134 | /* Process any ATTRIBUTES on a namespace definition. Currently only |
3135 | attribute visibility is meaningful, which is a property of the syntactic | |
3136 | block rather than the namespace as a whole, so we don't touch the | |
3137 | NAMESPACE_DECL at all. Returns true if attribute visibility is seen. */ | |
00e8de68 | 3138 | |
65567efa JM |
3139 | bool |
3140 | handle_namespace_attrs (tree ns, tree attributes) | |
0ed5edac | 3141 | { |
65567efa JM |
3142 | tree d; |
3143 | bool saw_vis = false; | |
0ed5edac | 3144 | |
65567efa JM |
3145 | for (d = attributes; d; d = TREE_CHAIN (d)) |
3146 | { | |
3147 | tree name = TREE_PURPOSE (d); | |
3148 | tree args = TREE_VALUE (d); | |
3149 | ||
3150 | #ifdef HANDLE_PRAGMA_VISIBILITY | |
3151 | if (is_attribute_p ("visibility", name)) | |
3152 | { | |
3153 | tree x = args ? TREE_VALUE (args) : NULL_TREE; | |
3154 | if (x == NULL_TREE || TREE_CODE (x) != STRING_CST || TREE_CHAIN (args)) | |
3155 | { | |
3156 | warning (OPT_Wattributes, | |
3157 | "%qD attribute requires a single NTBS argument", | |
3158 | name); | |
3159 | continue; | |
3160 | } | |
3161 | ||
3162 | if (!TREE_PUBLIC (ns)) | |
3163 | warning (OPT_Wattributes, | |
3164 | "%qD attribute is meaningless since members of the " | |
3165 | "anonymous namespace get local symbols", name); | |
3166 | ||
3167 | push_visibility (TREE_STRING_POINTER (x)); | |
3168 | saw_vis = true; | |
3169 | } | |
3170 | else | |
3171 | #endif | |
3172 | { | |
3173 | warning (OPT_Wattributes, "%qD attribute directive ignored", | |
3174 | name); | |
3175 | continue; | |
3176 | } | |
3177 | } | |
3178 | ||
3179 | return saw_vis; | |
3180 | } | |
3181 | ||
3182 | /* Push into the scope of the NAME namespace. If NAME is NULL_TREE, then we | |
3183 | select a name that is unique to this compilation unit. */ | |
0ed5edac JM |
3184 | |
3185 | void | |
65567efa | 3186 | push_namespace (tree name) |
00e8de68 GDR |
3187 | { |
3188 | tree d = NULL_TREE; | |
3189 | int need_new = 1; | |
3190 | int implicit_use = 0; | |
ed36980c | 3191 | bool anon = !name; |
00e8de68 GDR |
3192 | |
3193 | timevar_push (TV_NAME_LOOKUP); | |
c8094d83 | 3194 | |
00e8de68 GDR |
3195 | /* We should not get here if the global_namespace is not yet constructed |
3196 | nor if NAME designates the global namespace: The global scope is | |
3197 | constructed elsewhere. */ | |
50bc768d | 3198 | gcc_assert (global_namespace != NULL && name != global_scope_name); |
00e8de68 | 3199 | |
ed36980c | 3200 | if (anon) |
00e8de68 | 3201 | { |
5880f14f | 3202 | name = get_anonymous_namespace_name(); |
00e8de68 GDR |
3203 | d = IDENTIFIER_NAMESPACE_VALUE (name); |
3204 | if (d) | |
0cbd7506 MS |
3205 | /* Reopening anonymous namespace. */ |
3206 | need_new = 0; | |
00e8de68 GDR |
3207 | implicit_use = 1; |
3208 | } | |
3209 | else | |
3210 | { | |
3211 | /* Check whether this is an extended namespace definition. */ | |
3212 | d = IDENTIFIER_NAMESPACE_VALUE (name); | |
3213 | if (d != NULL_TREE && TREE_CODE (d) == NAMESPACE_DECL) | |
0cbd7506 MS |
3214 | { |
3215 | need_new = 0; | |
3216 | if (DECL_NAMESPACE_ALIAS (d)) | |
3217 | { | |
3218 | error ("namespace alias %qD not allowed here, assuming %qD", | |
3219 | d, DECL_NAMESPACE_ALIAS (d)); | |
3220 | d = DECL_NAMESPACE_ALIAS (d); | |
3221 | } | |
3222 | } | |
00e8de68 GDR |
3223 | } |
3224 | ||
3225 | if (need_new) | |
3226 | { | |
3227 | /* Make a new namespace, binding the name to it. */ | |
3228 | d = build_lang_decl (NAMESPACE_DECL, name, void_type_node); | |
3229 | DECL_CONTEXT (d) = FROB_CONTEXT (current_namespace); | |
b9e75696 JM |
3230 | /* The name of this namespace is not visible to other translation |
3231 | units if it is an anonymous namespace or member thereof. */ | |
3232 | if (anon || decl_anon_ns_mem_p (current_namespace)) | |
3233 | TREE_PUBLIC (d) = 0; | |
3234 | else | |
3235 | TREE_PUBLIC (d) = 1; | |
c0694c4b | 3236 | pushdecl (d); |
ed36980c JM |
3237 | if (anon) |
3238 | { | |
3239 | /* Clear DECL_NAME for the benefit of debugging back ends. */ | |
3240 | SET_DECL_ASSEMBLER_NAME (d, name); | |
3241 | DECL_NAME (d) = NULL_TREE; | |
3242 | } | |
00e8de68 GDR |
3243 | begin_scope (sk_namespace, d); |
3244 | } | |
3245 | else | |
3246 | resume_scope (NAMESPACE_LEVEL (d)); | |
3247 | ||
3248 | if (implicit_use) | |
3249 | do_using_directive (d); | |
3250 | /* Enter the name space. */ | |
3251 | current_namespace = d; | |
3252 | ||
3253 | timevar_pop (TV_NAME_LOOKUP); | |
3254 | } | |
3255 | ||
3256 | /* Pop from the scope of the current namespace. */ | |
3257 | ||
3258 | void | |
3259 | pop_namespace (void) | |
3260 | { | |
50bc768d | 3261 | gcc_assert (current_namespace != global_namespace); |
00e8de68 GDR |
3262 | current_namespace = CP_DECL_CONTEXT (current_namespace); |
3263 | /* The binding level is not popped, as it might be re-opened later. */ | |
3264 | leave_scope (); | |
3265 | } | |
3266 | ||
3267 | /* Push into the scope of the namespace NS, even if it is deeply | |
3268 | nested within another namespace. */ | |
3269 | ||
3270 | void | |
3271 | push_nested_namespace (tree ns) | |
3272 | { | |
3273 | if (ns == global_namespace) | |
3274 | push_to_top_level (); | |
3275 | else | |
3276 | { | |
3277 | push_nested_namespace (CP_DECL_CONTEXT (ns)); | |
3278 | push_namespace (DECL_NAME (ns)); | |
3279 | } | |
3280 | } | |
3281 | ||
3282 | /* Pop back from the scope of the namespace NS, which was previously | |
3283 | entered with push_nested_namespace. */ | |
3284 | ||
3285 | void | |
3286 | pop_nested_namespace (tree ns) | |
3287 | { | |
3288 | timevar_push (TV_NAME_LOOKUP); | |
3289 | while (ns != global_namespace) | |
3290 | { | |
3291 | pop_namespace (); | |
3292 | ns = CP_DECL_CONTEXT (ns); | |
3293 | } | |
3294 | ||
3295 | pop_from_top_level (); | |
3296 | timevar_pop (TV_NAME_LOOKUP); | |
3297 | } | |
3298 | ||
5a167978 GDR |
3299 | /* Temporarily set the namespace for the current declaration. */ |
3300 | ||
3301 | void | |
3302 | push_decl_namespace (tree decl) | |
3303 | { | |
3304 | if (TREE_CODE (decl) != NAMESPACE_DECL) | |
b1cc95ce | 3305 | decl = decl_namespace_context (decl); |
5a167978 | 3306 | decl_namespace_list = tree_cons (ORIGINAL_NAMESPACE (decl), |
0cbd7506 | 3307 | NULL_TREE, decl_namespace_list); |
5a167978 GDR |
3308 | } |
3309 | ||
3310 | /* [namespace.memdef]/2 */ | |
3311 | ||
3312 | void | |
3313 | pop_decl_namespace (void) | |
3314 | { | |
3315 | decl_namespace_list = TREE_CHAIN (decl_namespace_list); | |
3316 | } | |
3317 | ||
c8094d83 | 3318 | /* Return the namespace that is the common ancestor |
5a167978 GDR |
3319 | of two given namespaces. */ |
3320 | ||
a5e6b29b | 3321 | static tree |
5a167978 GDR |
3322 | namespace_ancestor (tree ns1, tree ns2) |
3323 | { | |
3324 | timevar_push (TV_NAME_LOOKUP); | |
3325 | if (is_ancestor (ns1, ns2)) | |
3326 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ns1); | |
3327 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 3328 | namespace_ancestor (CP_DECL_CONTEXT (ns1), ns2)); |
5a167978 GDR |
3329 | } |
3330 | ||
3331 | /* Process a namespace-alias declaration. */ | |
3332 | ||
3333 | void | |
be93747e | 3334 | do_namespace_alias (tree alias, tree name_space) |
5a167978 | 3335 | { |
be93747e | 3336 | if (name_space == error_mark_node) |
166206ce VR |
3337 | return; |
3338 | ||
be93747e | 3339 | gcc_assert (TREE_CODE (name_space) == NAMESPACE_DECL); |
5a167978 | 3340 | |
be93747e | 3341 | name_space = ORIGINAL_NAMESPACE (name_space); |
5a167978 GDR |
3342 | |
3343 | /* Build the alias. */ | |
c8094d83 | 3344 | alias = build_lang_decl (NAMESPACE_DECL, alias, void_type_node); |
be93747e | 3345 | DECL_NAMESPACE_ALIAS (alias) = name_space; |
5a167978 | 3346 | DECL_EXTERNAL (alias) = 1; |
6ac1920d | 3347 | DECL_CONTEXT (alias) = FROB_CONTEXT (current_scope ()); |
5a167978 | 3348 | pushdecl (alias); |
6097b0c3 DP |
3349 | |
3350 | /* Emit debug info for namespace alias. */ | |
47512a6e JJ |
3351 | if (!building_stmt_tree ()) |
3352 | (*debug_hooks->global_decl) (alias); | |
5a167978 GDR |
3353 | } |
3354 | ||
00e8de68 GDR |
3355 | /* Like pushdecl, only it places X in the current namespace, |
3356 | if appropriate. */ | |
3357 | ||
3358 | tree | |
d63d5d0c | 3359 | pushdecl_namespace_level (tree x, bool is_friend) |
00e8de68 | 3360 | { |
926ce8bd KH |
3361 | struct cp_binding_level *b = current_binding_level; |
3362 | tree t; | |
00e8de68 GDR |
3363 | |
3364 | timevar_push (TV_NAME_LOOKUP); | |
d63d5d0c | 3365 | t = pushdecl_with_scope (x, NAMESPACE_LEVEL (current_namespace), is_friend); |
00e8de68 GDR |
3366 | |
3367 | /* Now, the type_shadowed stack may screw us. Munge it so it does | |
3368 | what we want. */ | |
6fc98adf | 3369 | if (TREE_CODE (t) == TYPE_DECL) |
00e8de68 | 3370 | { |
6fc98adf | 3371 | tree name = DECL_NAME (t); |
00e8de68 GDR |
3372 | tree newval; |
3373 | tree *ptr = (tree *)0; | |
3374 | for (; !global_scope_p (b); b = b->level_chain) | |
0cbd7506 MS |
3375 | { |
3376 | tree shadowed = b->type_shadowed; | |
3377 | for (; shadowed; shadowed = TREE_CHAIN (shadowed)) | |
3378 | if (TREE_PURPOSE (shadowed) == name) | |
3379 | { | |
00e8de68 GDR |
3380 | ptr = &TREE_VALUE (shadowed); |
3381 | /* Can't break out of the loop here because sometimes | |
3382 | a binding level will have duplicate bindings for | |
3383 | PT names. It's gross, but I haven't time to fix it. */ | |
0cbd7506 MS |
3384 | } |
3385 | } | |
6fc98adf | 3386 | newval = TREE_TYPE (t); |
00e8de68 | 3387 | if (ptr == (tree *)0) |
0cbd7506 MS |
3388 | { |
3389 | /* @@ This shouldn't be needed. My test case "zstring.cc" trips | |
3390 | up here if this is changed to an assertion. --KR */ | |
6fc98adf | 3391 | SET_IDENTIFIER_TYPE_VALUE (name, t); |
00e8de68 GDR |
3392 | } |
3393 | else | |
0cbd7506 | 3394 | { |
00e8de68 | 3395 | *ptr = newval; |
0cbd7506 | 3396 | } |
00e8de68 GDR |
3397 | } |
3398 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
3399 | } | |
3400 | ||
5a167978 GDR |
3401 | /* Insert USED into the using list of USER. Set INDIRECT_flag if this |
3402 | directive is not directly from the source. Also find the common | |
3403 | ancestor and let our users know about the new namespace */ | |
c8094d83 | 3404 | static void |
5a167978 GDR |
3405 | add_using_namespace (tree user, tree used, bool indirect) |
3406 | { | |
3407 | tree t; | |
3408 | timevar_push (TV_NAME_LOOKUP); | |
3409 | /* Using oneself is a no-op. */ | |
3410 | if (user == used) | |
3411 | { | |
3412 | timevar_pop (TV_NAME_LOOKUP); | |
3413 | return; | |
3414 | } | |
50bc768d NS |
3415 | gcc_assert (TREE_CODE (user) == NAMESPACE_DECL); |
3416 | gcc_assert (TREE_CODE (used) == NAMESPACE_DECL); | |
5a167978 GDR |
3417 | /* Check if we already have this. */ |
3418 | t = purpose_member (used, DECL_NAMESPACE_USING (user)); | |
3419 | if (t != NULL_TREE) | |
3420 | { | |
3421 | if (!indirect) | |
3422 | /* Promote to direct usage. */ | |
3423 | TREE_INDIRECT_USING (t) = 0; | |
3424 | timevar_pop (TV_NAME_LOOKUP); | |
3425 | return; | |
3426 | } | |
3427 | ||
3428 | /* Add used to the user's using list. */ | |
c8094d83 MS |
3429 | DECL_NAMESPACE_USING (user) |
3430 | = tree_cons (used, namespace_ancestor (user, used), | |
5a167978 GDR |
3431 | DECL_NAMESPACE_USING (user)); |
3432 | ||
3433 | TREE_INDIRECT_USING (DECL_NAMESPACE_USING (user)) = indirect; | |
3434 | ||
3435 | /* Add user to the used's users list. */ | |
3436 | DECL_NAMESPACE_USERS (used) | |
3437 | = tree_cons (user, 0, DECL_NAMESPACE_USERS (used)); | |
3438 | ||
3439 | /* Recursively add all namespaces used. */ | |
3440 | for (t = DECL_NAMESPACE_USING (used); t; t = TREE_CHAIN (t)) | |
3441 | /* indirect usage */ | |
3442 | add_using_namespace (user, TREE_PURPOSE (t), 1); | |
3443 | ||
3444 | /* Tell everyone using us about the new used namespaces. */ | |
3445 | for (t = DECL_NAMESPACE_USERS (user); t; t = TREE_CHAIN (t)) | |
3446 | add_using_namespace (TREE_PURPOSE (t), used, 1); | |
3447 | timevar_pop (TV_NAME_LOOKUP); | |
3448 | } | |
3449 | ||
3450 | /* Process a using-declaration not appearing in class or local scope. */ | |
3451 | ||
3452 | void | |
ed5f054f | 3453 | do_toplevel_using_decl (tree decl, tree scope, tree name) |
5a167978 | 3454 | { |
5a167978 | 3455 | tree oldval, oldtype, newval, newtype; |
6097b0c3 | 3456 | tree orig_decl = decl; |
5a167978 GDR |
3457 | cxx_binding *binding; |
3458 | ||
ed5f054f | 3459 | decl = validate_nonmember_using_decl (decl, scope, name); |
5a167978 GDR |
3460 | if (decl == NULL_TREE) |
3461 | return; | |
c8094d83 | 3462 | |
5a167978 GDR |
3463 | binding = binding_for_name (NAMESPACE_LEVEL (current_namespace), name); |
3464 | ||
3465 | oldval = binding->value; | |
3466 | oldtype = binding->type; | |
3467 | ||
3468 | do_nonmember_using_decl (scope, name, oldval, oldtype, &newval, &newtype); | |
3469 | ||
6097b0c3 DP |
3470 | /* Emit debug info. */ |
3471 | if (!processing_template_decl) | |
3472 | cp_emit_debug_info_for_using (orig_decl, current_namespace); | |
3473 | ||
5a167978 GDR |
3474 | /* Copy declarations found. */ |
3475 | if (newval) | |
3476 | binding->value = newval; | |
3477 | if (newtype) | |
3478 | binding->type = newtype; | |
5a167978 GDR |
3479 | } |
3480 | ||
3481 | /* Process a using-directive. */ | |
3482 | ||
3483 | void | |
be93747e | 3484 | do_using_directive (tree name_space) |
5a167978 | 3485 | { |
6097b0c3 DP |
3486 | tree context = NULL_TREE; |
3487 | ||
be93747e | 3488 | if (name_space == error_mark_node) |
166206ce VR |
3489 | return; |
3490 | ||
be93747e | 3491 | gcc_assert (TREE_CODE (name_space) == NAMESPACE_DECL); |
166206ce | 3492 | |
5a167978 | 3493 | if (building_stmt_tree ()) |
c2255bc4 | 3494 | add_stmt (build_stmt (input_location, USING_STMT, name_space)); |
be93747e | 3495 | name_space = ORIGINAL_NAMESPACE (name_space); |
166206ce | 3496 | |
5a167978 | 3497 | if (!toplevel_bindings_p ()) |
6097b0c3 | 3498 | { |
be93747e | 3499 | push_using_directive (name_space); |
6097b0c3 | 3500 | } |
5a167978 | 3501 | else |
6097b0c3 DP |
3502 | { |
3503 | /* direct usage */ | |
be93747e | 3504 | add_using_namespace (current_namespace, name_space, 0); |
6097b0c3 DP |
3505 | if (current_namespace != global_namespace) |
3506 | context = current_namespace; | |
c8094d83 | 3507 | |
d19c0f4b DS |
3508 | /* Emit debugging info. */ |
3509 | if (!processing_template_decl) | |
3510 | (*debug_hooks->imported_module_or_decl) (name_space, NULL_TREE, | |
3511 | context, false); | |
3512 | } | |
5a167978 GDR |
3513 | } |
3514 | ||
86098eb8 JM |
3515 | /* Deal with a using-directive seen by the parser. Currently we only |
3516 | handle attributes here, since they cannot appear inside a template. */ | |
3517 | ||
3518 | void | |
be93747e | 3519 | parse_using_directive (tree name_space, tree attribs) |
86098eb8 JM |
3520 | { |
3521 | tree a; | |
3522 | ||
be93747e | 3523 | do_using_directive (name_space); |
86098eb8 JM |
3524 | |
3525 | for (a = attribs; a; a = TREE_CHAIN (a)) | |
3526 | { | |
3527 | tree name = TREE_PURPOSE (a); | |
3528 | if (is_attribute_p ("strong", name)) | |
3529 | { | |
3530 | if (!toplevel_bindings_p ()) | |
3531 | error ("strong using only meaningful at namespace scope"); | |
be93747e | 3532 | else if (name_space != error_mark_node) |
9deb204a | 3533 | { |
be93747e | 3534 | if (!is_ancestor (current_namespace, name_space)) |
9deb204a | 3535 | error ("current namespace %qD does not enclose strongly used namespace %qD", |
be93747e KG |
3536 | current_namespace, name_space); |
3537 | DECL_NAMESPACE_ASSOCIATIONS (name_space) | |
9deb204a | 3538 | = tree_cons (current_namespace, 0, |
be93747e | 3539 | DECL_NAMESPACE_ASSOCIATIONS (name_space)); |
9deb204a | 3540 | } |
86098eb8 JM |
3541 | } |
3542 | else | |
5c498b10 | 3543 | warning (OPT_Wattributes, "%qD attribute directive ignored", name); |
86098eb8 JM |
3544 | } |
3545 | } | |
3546 | ||
a5e6b29b GDR |
3547 | /* Like pushdecl, only it places X in the global scope if appropriate. |
3548 | Calls cp_finish_decl to register the variable, initializing it with | |
3549 | *INIT, if INIT is non-NULL. */ | |
3550 | ||
3551 | static tree | |
d63d5d0c | 3552 | pushdecl_top_level_1 (tree x, tree *init, bool is_friend) |
a5e6b29b GDR |
3553 | { |
3554 | timevar_push (TV_NAME_LOOKUP); | |
3555 | push_to_top_level (); | |
d63d5d0c | 3556 | x = pushdecl_namespace_level (x, is_friend); |
a5e6b29b | 3557 | if (init) |
bbbbb16a | 3558 | finish_decl (x, *init, NULL_TREE, NULL_TREE); |
a5e6b29b GDR |
3559 | pop_from_top_level (); |
3560 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, x); | |
3561 | } | |
3562 | ||
3563 | /* Like pushdecl, only it places X in the global scope if appropriate. */ | |
3564 | ||
3565 | tree | |
3566 | pushdecl_top_level (tree x) | |
3567 | { | |
d63d5d0c ILT |
3568 | return pushdecl_top_level_1 (x, NULL, false); |
3569 | } | |
3570 | ||
3571 | /* Like pushdecl_top_level, but adding the IS_FRIEND parameter. */ | |
3572 | ||
3573 | tree | |
3574 | pushdecl_top_level_maybe_friend (tree x, bool is_friend) | |
3575 | { | |
3576 | return pushdecl_top_level_1 (x, NULL, is_friend); | |
a5e6b29b GDR |
3577 | } |
3578 | ||
3579 | /* Like pushdecl, only it places X in the global scope if | |
3580 | appropriate. Calls cp_finish_decl to register the variable, | |
3581 | initializing it with INIT. */ | |
3582 | ||
3583 | tree | |
3584 | pushdecl_top_level_and_finish (tree x, tree init) | |
3585 | { | |
d63d5d0c | 3586 | return pushdecl_top_level_1 (x, &init, false); |
a5e6b29b GDR |
3587 | } |
3588 | ||
5a167978 GDR |
3589 | /* Combines two sets of overloaded functions into an OVERLOAD chain, removing |
3590 | duplicates. The first list becomes the tail of the result. | |
3591 | ||
3592 | The algorithm is O(n^2). We could get this down to O(n log n) by | |
3593 | doing a sort on the addresses of the functions, if that becomes | |
3594 | necessary. */ | |
3595 | ||
3596 | static tree | |
3597 | merge_functions (tree s1, tree s2) | |
3598 | { | |
3599 | for (; s2; s2 = OVL_NEXT (s2)) | |
3600 | { | |
3601 | tree fn2 = OVL_CURRENT (s2); | |
3602 | tree fns1; | |
3603 | ||
3604 | for (fns1 = s1; fns1; fns1 = OVL_NEXT (fns1)) | |
3605 | { | |
3606 | tree fn1 = OVL_CURRENT (fns1); | |
3607 | ||
3608 | /* If the function from S2 is already in S1, there is no | |
3609 | need to add it again. For `extern "C"' functions, we | |
3610 | might have two FUNCTION_DECLs for the same function, in | |
e04c614e JM |
3611 | different namespaces, but let's leave them in in case |
3612 | they have different default arguments. */ | |
3613 | if (fn1 == fn2) | |
5a167978 GDR |
3614 | break; |
3615 | } | |
c8094d83 | 3616 | |
5a167978 GDR |
3617 | /* If we exhausted all of the functions in S1, FN2 is new. */ |
3618 | if (!fns1) | |
3619 | s1 = build_overload (fn2, s1); | |
3620 | } | |
3621 | return s1; | |
3622 | } | |
3623 | ||
3624 | /* This should return an error not all definitions define functions. | |
3625 | It is not an error if we find two functions with exactly the | |
3626 | same signature, only if these are selected in overload resolution. | |
be93747e | 3627 | old is the current set of bindings, new_binding the freshly-found binding. |
5a167978 GDR |
3628 | XXX Do we want to give *all* candidates in case of ambiguity? |
3629 | XXX In what way should I treat extern declarations? | |
3630 | XXX I don't want to repeat the entire duplicate_decls here */ | |
3631 | ||
15f8ac7f | 3632 | static void |
be93747e | 3633 | ambiguous_decl (struct scope_binding *old, cxx_binding *new_binding, int flags) |
5a167978 GDR |
3634 | { |
3635 | tree val, type; | |
50bc768d | 3636 | gcc_assert (old != NULL); |
af92ab36 OW |
3637 | |
3638 | /* Copy the type. */ | |
be93747e | 3639 | type = new_binding->type; |
af92ab36 OW |
3640 | if (LOOKUP_NAMESPACES_ONLY (flags) |
3641 | || (type && hidden_name_p (type) && !(flags & LOOKUP_HIDDEN))) | |
3642 | type = NULL_TREE; | |
3643 | ||
5a167978 | 3644 | /* Copy the value. */ |
be93747e | 3645 | val = new_binding->value; |
5a167978 | 3646 | if (val) |
af92ab36 OW |
3647 | { |
3648 | if (hidden_name_p (val) && !(flags & LOOKUP_HIDDEN)) | |
3649 | val = NULL_TREE; | |
3650 | else | |
3651 | switch (TREE_CODE (val)) | |
3652 | { | |
3653 | case TEMPLATE_DECL: | |
3654 | /* If we expect types or namespaces, and not templates, | |
3655 | or this is not a template class. */ | |
3656 | if ((LOOKUP_QUALIFIERS_ONLY (flags) | |
3657 | && !DECL_CLASS_TEMPLATE_P (val))) | |
3658 | val = NULL_TREE; | |
3659 | break; | |
3660 | case TYPE_DECL: | |
3661 | if (LOOKUP_NAMESPACES_ONLY (flags) | |
3662 | || (type && (flags & LOOKUP_PREFER_TYPES))) | |
3663 | val = NULL_TREE; | |
3664 | break; | |
3665 | case NAMESPACE_DECL: | |
3666 | if (LOOKUP_TYPES_ONLY (flags)) | |
3667 | val = NULL_TREE; | |
3668 | break; | |
3669 | case FUNCTION_DECL: | |
3670 | /* Ignore built-in functions that are still anticipated. */ | |
3671 | if (LOOKUP_QUALIFIERS_ONLY (flags)) | |
3672 | val = NULL_TREE; | |
3673 | break; | |
3674 | default: | |
3675 | if (LOOKUP_QUALIFIERS_ONLY (flags)) | |
3676 | val = NULL_TREE; | |
3677 | } | |
3678 | } | |
3679 | ||
3680 | /* If val is hidden, shift down any class or enumeration name. */ | |
3681 | if (!val) | |
3682 | { | |
3683 | val = type; | |
3684 | type = NULL_TREE; | |
3685 | } | |
c8094d83 | 3686 | |
5a167978 GDR |
3687 | if (!old->value) |
3688 | old->value = val; | |
3689 | else if (val && val != old->value) | |
3690 | { | |
3691 | if (is_overloaded_fn (old->value) && is_overloaded_fn (val)) | |
0cbd7506 | 3692 | old->value = merge_functions (old->value, val); |
5a167978 GDR |
3693 | else |
3694 | { | |
91b1ca65 | 3695 | old->value = tree_cons (NULL_TREE, old->value, |
af92ab36 | 3696 | build_tree_list (NULL_TREE, val)); |
91b1ca65 | 3697 | TREE_TYPE (old->value) = error_mark_node; |
5a167978 GDR |
3698 | } |
3699 | } | |
af92ab36 | 3700 | |
5a167978 GDR |
3701 | if (!old->type) |
3702 | old->type = type; | |
3703 | else if (type && old->type != type) | |
3704 | { | |
19831e2b OW |
3705 | old->type = tree_cons (NULL_TREE, old->type, |
3706 | build_tree_list (NULL_TREE, type)); | |
3707 | TREE_TYPE (old->type) = error_mark_node; | |
5a167978 | 3708 | } |
5a167978 GDR |
3709 | } |
3710 | ||
00e8de68 GDR |
3711 | /* Return the declarations that are members of the namespace NS. */ |
3712 | ||
3713 | tree | |
3714 | cp_namespace_decls (tree ns) | |
3715 | { | |
3716 | return NAMESPACE_LEVEL (ns)->names; | |
3717 | } | |
3718 | ||
3719 | /* Combine prefer_type and namespaces_only into flags. */ | |
3720 | ||
3721 | static int | |
3722 | lookup_flags (int prefer_type, int namespaces_only) | |
3723 | { | |
3724 | if (namespaces_only) | |
3725 | return LOOKUP_PREFER_NAMESPACES; | |
3726 | if (prefer_type > 1) | |
3727 | return LOOKUP_PREFER_TYPES; | |
3728 | if (prefer_type > 0) | |
3729 | return LOOKUP_PREFER_BOTH; | |
3730 | return 0; | |
3731 | } | |
3732 | ||
3733 | /* Given a lookup that returned VAL, use FLAGS to decide if we want to | |
bd3d082e KL |
3734 | ignore it or not. Subroutine of lookup_name_real and |
3735 | lookup_type_scope. */ | |
00e8de68 | 3736 | |
bd3d082e | 3737 | static bool |
00e8de68 GDR |
3738 | qualify_lookup (tree val, int flags) |
3739 | { | |
3740 | if (val == NULL_TREE) | |
bd3d082e | 3741 | return false; |
00e8de68 | 3742 | if ((flags & LOOKUP_PREFER_NAMESPACES) && TREE_CODE (val) == NAMESPACE_DECL) |
bd3d082e | 3743 | return true; |
00e8de68 GDR |
3744 | if ((flags & LOOKUP_PREFER_TYPES) |
3745 | && (TREE_CODE (val) == TYPE_DECL || TREE_CODE (val) == TEMPLATE_DECL)) | |
bd3d082e | 3746 | return true; |
00e8de68 | 3747 | if (flags & (LOOKUP_PREFER_NAMESPACES | LOOKUP_PREFER_TYPES)) |
bd3d082e KL |
3748 | return false; |
3749 | return true; | |
3750 | } | |
3751 | ||
c8094d83 | 3752 | /* Given a lookup that returned VAL, decide if we want to ignore it or |
d63d5d0c | 3753 | not based on DECL_ANTICIPATED. */ |
bd3d082e KL |
3754 | |
3755 | bool | |
3756 | hidden_name_p (tree val) | |
3757 | { | |
3758 | if (DECL_P (val) | |
3759 | && DECL_LANG_SPECIFIC (val) | |
3760 | && DECL_ANTICIPATED (val)) | |
3761 | return true; | |
3762 | return false; | |
00e8de68 GDR |
3763 | } |
3764 | ||
d63d5d0c ILT |
3765 | /* Remove any hidden friend functions from a possibly overloaded set |
3766 | of functions. */ | |
3767 | ||
3768 | tree | |
3769 | remove_hidden_names (tree fns) | |
3770 | { | |
3771 | if (!fns) | |
3772 | return fns; | |
3773 | ||
3774 | if (TREE_CODE (fns) == FUNCTION_DECL && hidden_name_p (fns)) | |
3775 | fns = NULL_TREE; | |
3776 | else if (TREE_CODE (fns) == OVERLOAD) | |
3777 | { | |
3778 | tree o; | |
3779 | ||
3780 | for (o = fns; o; o = OVL_NEXT (o)) | |
3781 | if (hidden_name_p (OVL_CURRENT (o))) | |
3782 | break; | |
3783 | if (o) | |
3784 | { | |
3785 | tree n = NULL_TREE; | |
3786 | ||
3787 | for (o = fns; o; o = OVL_NEXT (o)) | |
3788 | if (!hidden_name_p (OVL_CURRENT (o))) | |
3789 | n = build_overload (OVL_CURRENT (o), n); | |
3790 | fns = n; | |
3791 | } | |
3792 | } | |
3793 | ||
3794 | return fns; | |
3795 | } | |
3796 | ||
00e8de68 | 3797 | /* Unscoped lookup of a global: iterate over current namespaces, |
543ebd4a | 3798 | considering using-directives. */ |
00e8de68 | 3799 | |
a5e6b29b | 3800 | static tree |
543ebd4a | 3801 | unqualified_namespace_lookup (tree name, int flags) |
00e8de68 GDR |
3802 | { |
3803 | tree initial = current_decl_namespace (); | |
3804 | tree scope = initial; | |
3805 | tree siter; | |
3806 | struct cp_binding_level *level; | |
3807 | tree val = NULL_TREE; | |
00e8de68 GDR |
3808 | |
3809 | timevar_push (TV_NAME_LOOKUP); | |
00e8de68 GDR |
3810 | |
3811 | for (; !val; scope = CP_DECL_CONTEXT (scope)) | |
3812 | { | |
af92ab36 | 3813 | struct scope_binding binding = EMPTY_SCOPE_BINDING; |
00e8de68 | 3814 | cxx_binding *b = |
0cbd7506 | 3815 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); |
00e8de68 | 3816 | |
ba18e4db | 3817 | if (b) |
19831e2b | 3818 | ambiguous_decl (&binding, b, flags); |
00e8de68 GDR |
3819 | |
3820 | /* Add all _DECLs seen through local using-directives. */ | |
3821 | for (level = current_binding_level; | |
3822 | level->kind != sk_namespace; | |
3823 | level = level->level_chain) | |
3824 | if (!lookup_using_namespace (name, &binding, level->using_directives, | |
0cbd7506 | 3825 | scope, flags)) |
00e8de68 GDR |
3826 | /* Give up because of error. */ |
3827 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
3828 | ||
3829 | /* Add all _DECLs seen through global using-directives. */ | |
3830 | /* XXX local and global using lists should work equally. */ | |
3831 | siter = initial; | |
3832 | while (1) | |
3833 | { | |
3834 | if (!lookup_using_namespace (name, &binding, | |
0cbd7506 | 3835 | DECL_NAMESPACE_USING (siter), |
543ebd4a | 3836 | scope, flags)) |
00e8de68 GDR |
3837 | /* Give up because of error. */ |
3838 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
3839 | if (siter == scope) break; | |
3840 | siter = CP_DECL_CONTEXT (siter); | |
3841 | } | |
3842 | ||
af92ab36 | 3843 | val = binding.value; |
00e8de68 GDR |
3844 | if (scope == global_namespace) |
3845 | break; | |
3846 | } | |
3847 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
3848 | } | |
3849 | ||
3850 | /* Look up NAME (an IDENTIFIER_NODE) in SCOPE (either a NAMESPACE_DECL | |
3851 | or a class TYPE). If IS_TYPE_P is TRUE, then ignore non-type | |
c8094d83 | 3852 | bindings. |
00e8de68 GDR |
3853 | |
3854 | Returns a DECL (or OVERLOAD, or BASELINK) representing the | |
3855 | declaration found. If no suitable declaration can be found, | |
8f78f01f | 3856 | ERROR_MARK_NODE is returned. If COMPLAIN is true and SCOPE is |
00e8de68 GDR |
3857 | neither a class-type nor a namespace a diagnostic is issued. */ |
3858 | ||
3859 | tree | |
3860 | lookup_qualified_name (tree scope, tree name, bool is_type_p, bool complain) | |
3861 | { | |
3862 | int flags = 0; | |
ff8fe3e0 | 3863 | tree t = NULL_TREE; |
00e8de68 GDR |
3864 | |
3865 | if (TREE_CODE (scope) == NAMESPACE_DECL) | |
3866 | { | |
15f8ac7f | 3867 | struct scope_binding binding = EMPTY_SCOPE_BINDING; |
00e8de68 | 3868 | |
00e8de68 GDR |
3869 | flags |= LOOKUP_COMPLAIN; |
3870 | if (is_type_p) | |
3871 | flags |= LOOKUP_PREFER_TYPES; | |
543ebd4a | 3872 | if (qualified_lookup_using_namespace (name, scope, &binding, flags)) |
af92ab36 | 3873 | t = binding.value; |
00e8de68 | 3874 | } |
adf2edec DG |
3875 | else if (cxx_dialect != cxx98 && TREE_CODE (scope) == ENUMERAL_TYPE) |
3876 | t = lookup_enumerator (scope, name); | |
9e1e64ec | 3877 | else if (is_class_type (scope, complain)) |
ff8fe3e0 | 3878 | t = lookup_member (scope, name, 2, is_type_p); |
00e8de68 | 3879 | |
ff8fe3e0 VR |
3880 | if (!t) |
3881 | return error_mark_node; | |
3882 | return t; | |
00e8de68 GDR |
3883 | } |
3884 | ||
cd0be382 | 3885 | /* Subroutine of unqualified_namespace_lookup: |
5a167978 GDR |
3886 | Add the bindings of NAME in used namespaces to VAL. |
3887 | We are currently looking for names in namespace SCOPE, so we | |
3888 | look through USINGS for using-directives of namespaces | |
3889 | which have SCOPE as a common ancestor with the current scope. | |
3890 | Returns false on errors. */ | |
3891 | ||
a5e6b29b | 3892 | static bool |
15f8ac7f GK |
3893 | lookup_using_namespace (tree name, struct scope_binding *val, |
3894 | tree usings, tree scope, int flags) | |
5a167978 GDR |
3895 | { |
3896 | tree iter; | |
3897 | timevar_push (TV_NAME_LOOKUP); | |
3898 | /* Iterate over all used namespaces in current, searching for using | |
3899 | directives of scope. */ | |
3900 | for (iter = usings; iter; iter = TREE_CHAIN (iter)) | |
3901 | if (TREE_VALUE (iter) == scope) | |
3902 | { | |
0cbd7506 MS |
3903 | tree used = ORIGINAL_NAMESPACE (TREE_PURPOSE (iter)); |
3904 | cxx_binding *val1 = | |
3905 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (used), name); | |
3906 | /* Resolve ambiguities. */ | |
3907 | if (val1) | |
19831e2b | 3908 | ambiguous_decl (val, val1, flags); |
5a167978 GDR |
3909 | } |
3910 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val->value != error_mark_node); | |
3911 | } | |
3912 | ||
3913 | /* [namespace.qual] | |
3914 | Accepts the NAME to lookup and its qualifying SCOPE. | |
3915 | Returns the name/type pair found into the cxx_binding *RESULT, | |
3916 | or false on error. */ | |
3917 | ||
a5e6b29b | 3918 | static bool |
15f8ac7f GK |
3919 | qualified_lookup_using_namespace (tree name, tree scope, |
3920 | struct scope_binding *result, int flags) | |
5a167978 GDR |
3921 | { |
3922 | /* Maintain a list of namespaces visited... */ | |
3923 | tree seen = NULL_TREE; | |
3924 | /* ... and a list of namespace yet to see. */ | |
3925 | tree todo = NULL_TREE; | |
dc55c941 | 3926 | tree todo_maybe = NULL_TREE; |
5a167978 GDR |
3927 | tree usings; |
3928 | timevar_push (TV_NAME_LOOKUP); | |
3929 | /* Look through namespace aliases. */ | |
3930 | scope = ORIGINAL_NAMESPACE (scope); | |
3931 | while (scope && result->value != error_mark_node) | |
3932 | { | |
3933 | cxx_binding *binding = | |
dc55c941 | 3934 | cxx_scope_find_binding_for_name (NAMESPACE_LEVEL (scope), name); |
5a167978 GDR |
3935 | seen = tree_cons (scope, NULL_TREE, seen); |
3936 | if (binding) | |
19831e2b | 3937 | ambiguous_decl (result, binding, flags); |
c404ab02 AO |
3938 | |
3939 | /* Consider strong using directives always, and non-strong ones | |
3940 | if we haven't found a binding yet. ??? Shouldn't we consider | |
3941 | non-strong ones if the initial RESULT is non-NULL, but the | |
3942 | binding in the given namespace is? */ | |
3943 | for (usings = DECL_NAMESPACE_USING (scope); usings; | |
3944 | usings = TREE_CHAIN (usings)) | |
3945 | /* If this was a real directive, and we have not seen it. */ | |
dc55c941 AO |
3946 | if (!TREE_INDIRECT_USING (usings)) |
3947 | { | |
3948 | /* Try to avoid queuing the same namespace more than once, | |
3949 | the exception being when a namespace was already | |
3950 | enqueued for todo_maybe and then a strong using is | |
3951 | found for it. We could try to remove it from | |
3952 | todo_maybe, but it's probably not worth the effort. */ | |
3953 | if (is_associated_namespace (scope, TREE_PURPOSE (usings)) | |
3954 | && !purpose_member (TREE_PURPOSE (usings), seen) | |
3955 | && !purpose_member (TREE_PURPOSE (usings), todo)) | |
3956 | todo = tree_cons (TREE_PURPOSE (usings), NULL_TREE, todo); | |
3957 | else if ((!result->value && !result->type) | |
3958 | && !purpose_member (TREE_PURPOSE (usings), seen) | |
3959 | && !purpose_member (TREE_PURPOSE (usings), todo) | |
3960 | && !purpose_member (TREE_PURPOSE (usings), todo_maybe)) | |
3961 | todo_maybe = tree_cons (TREE_PURPOSE (usings), NULL_TREE, | |
3962 | todo_maybe); | |
3963 | } | |
5a167978 GDR |
3964 | if (todo) |
3965 | { | |
3966 | scope = TREE_PURPOSE (todo); | |
3967 | todo = TREE_CHAIN (todo); | |
3968 | } | |
dc55c941 AO |
3969 | else if (todo_maybe |
3970 | && (!result->value && !result->type)) | |
3971 | { | |
3972 | scope = TREE_PURPOSE (todo_maybe); | |
3973 | todo = TREE_CHAIN (todo_maybe); | |
3974 | todo_maybe = NULL_TREE; | |
3975 | } | |
5a167978 GDR |
3976 | else |
3977 | scope = NULL_TREE; /* If there never was a todo list. */ | |
3978 | } | |
3979 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, result->value != error_mark_node); | |
3980 | } | |
3981 | ||
172a4594 DS |
3982 | /* Subroutine of outer_binding. |
3983 | Returns TRUE if BINDING is a binding to a template parameter of SCOPE, | |
3984 | FALSE otherwise. */ | |
3985 | ||
3986 | static bool | |
3987 | binding_to_template_parms_of_scope_p (cxx_binding *binding, | |
3988 | cxx_scope *scope) | |
3989 | { | |
3990 | tree binding_value; | |
3991 | ||
3992 | if (!binding || !scope) | |
3993 | return false; | |
3994 | ||
3995 | binding_value = binding->value ? binding->value : binding->type; | |
3996 | ||
3997 | return (scope | |
3998 | && scope->this_entity | |
3999 | && get_template_info (scope->this_entity) | |
4000 | && parameter_of_template_p (binding_value, | |
4001 | TI_TEMPLATE (get_template_info \ | |
4002 | (scope->this_entity)))); | |
4003 | } | |
4004 | ||
90ea9897 | 4005 | /* Return the innermost non-namespace binding for NAME from a scope |
172a4594 DS |
4006 | containing BINDING, or, if BINDING is NULL, the current scope. |
4007 | Please note that for a given template, the template parameters are | |
4008 | considered to be in the scope containing the current scope. | |
4009 | If CLASS_P is false, then class bindings are ignored. */ | |
90ea9897 MM |
4010 | |
4011 | cxx_binding * | |
c8094d83 | 4012 | outer_binding (tree name, |
90ea9897 MM |
4013 | cxx_binding *binding, |
4014 | bool class_p) | |
4015 | { | |
4016 | cxx_binding *outer; | |
4017 | cxx_scope *scope; | |
4018 | cxx_scope *outer_scope; | |
4019 | ||
4020 | if (binding) | |
4021 | { | |
4022 | scope = binding->scope->level_chain; | |
4023 | outer = binding->previous; | |
4024 | } | |
4025 | else | |
4026 | { | |
4027 | scope = current_binding_level; | |
4028 | outer = IDENTIFIER_BINDING (name); | |
4029 | } | |
4030 | outer_scope = outer ? outer->scope : NULL; | |
4031 | ||
4032 | /* Because we create class bindings lazily, we might be missing a | |
4033 | class binding for NAME. If there are any class binding levels | |
4034 | between the LAST_BINDING_LEVEL and the scope in which OUTER was | |
4035 | declared, we must lookup NAME in those class scopes. */ | |
4036 | if (class_p) | |
4037 | while (scope && scope != outer_scope && scope->kind != sk_namespace) | |
4038 | { | |
c8094d83 | 4039 | if (scope->kind == sk_class) |
90ea9897 MM |
4040 | { |
4041 | cxx_binding *class_binding; | |
c8094d83 | 4042 | |
90ea9897 MM |
4043 | class_binding = get_class_binding (name, scope); |
4044 | if (class_binding) | |
4045 | { | |
4046 | /* Thread this new class-scope binding onto the | |
4047 | IDENTIFIER_BINDING list so that future lookups | |
4048 | find it quickly. */ | |
4049 | class_binding->previous = outer; | |
4050 | if (binding) | |
4051 | binding->previous = class_binding; | |
4052 | else | |
4053 | IDENTIFIER_BINDING (name) = class_binding; | |
4054 | return class_binding; | |
4055 | } | |
4056 | } | |
8e39b368 JM |
4057 | /* If we are in a member template, the template parms of the member |
4058 | template are considered to be inside the scope of the containing | |
4059 | class, but within G++ the class bindings are all pushed between the | |
4060 | template parms and the function body. So if the outer binding is | |
4061 | a template parm for the current scope, return it now rather than | |
4062 | look for a class binding. */ | |
172a4594 DS |
4063 | if (outer_scope && outer_scope->kind == sk_template_parms |
4064 | && binding_to_template_parms_of_scope_p (outer, scope)) | |
4065 | return outer; | |
4066 | ||
90ea9897 MM |
4067 | scope = scope->level_chain; |
4068 | } | |
4069 | ||
4070 | return outer; | |
4071 | } | |
4072 | ||
4073 | /* Return the innermost block-scope or class-scope value binding for | |
4074 | NAME, or NULL_TREE if there is no such binding. */ | |
4075 | ||
4076 | tree | |
4077 | innermost_non_namespace_value (tree name) | |
4078 | { | |
4079 | cxx_binding *binding; | |
4080 | binding = outer_binding (name, /*binding=*/NULL, /*class_p=*/true); | |
4081 | return binding ? binding->value : NULL_TREE; | |
4082 | } | |
4083 | ||
00e8de68 GDR |
4084 | /* Look up NAME in the current binding level and its superiors in the |
4085 | namespace of variables, functions and typedefs. Return a ..._DECL | |
4086 | node of some kind representing its definition if there is only one | |
4087 | such declaration, or return a TREE_LIST with all the overloaded | |
4088 | definitions if there are many, or return 0 if it is undefined. | |
bd3d082e KL |
4089 | Hidden name, either friend declaration or built-in function, are |
4090 | not ignored. | |
00e8de68 GDR |
4091 | |
4092 | If PREFER_TYPE is > 0, we prefer TYPE_DECLs or namespaces. | |
4093 | If PREFER_TYPE is > 1, we reject non-type decls (e.g. namespaces). | |
4094 | Otherwise we prefer non-TYPE_DECLs. | |
4095 | ||
39fb05d0 MM |
4096 | If NONCLASS is nonzero, bindings in class scopes are ignored. If |
4097 | BLOCK_P is false, bindings in block scopes are ignored. */ | |
00e8de68 GDR |
4098 | |
4099 | tree | |
12cf89fa | 4100 | lookup_name_real (tree name, int prefer_type, int nonclass, bool block_p, |
00e8de68 GDR |
4101 | int namespaces_only, int flags) |
4102 | { | |
4103 | cxx_binding *iter; | |
4104 | tree val = NULL_TREE; | |
4105 | ||
4106 | timevar_push (TV_NAME_LOOKUP); | |
4107 | /* Conversion operators are handled specially because ordinary | |
4108 | unqualified name lookup will not find template conversion | |
4109 | operators. */ | |
c8094d83 | 4110 | if (IDENTIFIER_TYPENAME_P (name)) |
00e8de68 GDR |
4111 | { |
4112 | struct cp_binding_level *level; | |
4113 | ||
c8094d83 | 4114 | for (level = current_binding_level; |
00e8de68 GDR |
4115 | level && level->kind != sk_namespace; |
4116 | level = level->level_chain) | |
4117 | { | |
4118 | tree class_type; | |
4119 | tree operators; | |
c8094d83 MS |
4120 | |
4121 | /* A conversion operator can only be declared in a class | |
00e8de68 GDR |
4122 | scope. */ |
4123 | if (level->kind != sk_class) | |
4124 | continue; | |
c8094d83 | 4125 | |
00e8de68 GDR |
4126 | /* Lookup the conversion operator in the class. */ |
4127 | class_type = level->this_entity; | |
4128 | operators = lookup_fnfields (class_type, name, /*protect=*/0); | |
4129 | if (operators) | |
4130 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, operators); | |
4131 | } | |
4132 | ||
4133 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
4134 | } | |
4135 | ||
4136 | flags |= lookup_flags (prefer_type, namespaces_only); | |
4137 | ||
4138 | /* First, look in non-namespace scopes. */ | |
4139 | ||
4140 | if (current_class_type == NULL_TREE) | |
4141 | nonclass = 1; | |
4142 | ||
12cf89fa | 4143 | if (block_p || !nonclass) |
90ea9897 MM |
4144 | for (iter = outer_binding (name, NULL, !nonclass); |
4145 | iter; | |
4146 | iter = outer_binding (name, iter, !nonclass)) | |
12cf89fa MM |
4147 | { |
4148 | tree binding; | |
c8094d83 | 4149 | |
12cf89fa MM |
4150 | /* Skip entities we don't want. */ |
4151 | if (LOCAL_BINDING_P (iter) ? !block_p : nonclass) | |
4152 | continue; | |
c8094d83 | 4153 | |
12cf89fa | 4154 | /* If this is the kind of thing we're looking for, we're done. */ |
105d72c5 | 4155 | if (qualify_lookup (iter->value, flags)) |
12cf89fa MM |
4156 | binding = iter->value; |
4157 | else if ((flags & LOOKUP_PREFER_TYPES) | |
105d72c5 | 4158 | && qualify_lookup (iter->type, flags)) |
12cf89fa MM |
4159 | binding = iter->type; |
4160 | else | |
4161 | binding = NULL_TREE; | |
c8094d83 | 4162 | |
12cf89fa MM |
4163 | if (binding) |
4164 | { | |
d4d8c232 SM |
4165 | if (hidden_name_p (binding)) |
4166 | { | |
b9f673eb JM |
4167 | /* A non namespace-scope binding can only be hidden in the |
4168 | presence of a local class, due to friend declarations. | |
4169 | ||
d4d8c232 SM |
4170 | In particular, consider: |
4171 | ||
b9f673eb | 4172 | struct C; |
d4d8c232 SM |
4173 | void f() { |
4174 | struct A { | |
4175 | friend struct B; | |
b9f673eb JM |
4176 | friend struct C; |
4177 | void g() { | |
4178 | B* b; // error: B is hidden | |
4179 | C* c; // OK, finds ::C | |
4180 | } | |
4181 | }; | |
4182 | B *b; // error: B is hidden | |
4183 | C *c; // OK, finds ::C | |
d4d8c232 | 4184 | struct B {}; |
b9f673eb | 4185 | B *bb; // OK |
d4d8c232 SM |
4186 | } |
4187 | ||
4188 | The standard says that "B" is a local class in "f" | |
4189 | (but not nested within "A") -- but that name lookup | |
4190 | for "B" does not find this declaration until it is | |
4191 | declared directly with "f". | |
4192 | ||
4193 | In particular: | |
4194 | ||
4195 | [class.friend] | |
4196 | ||
4197 | If a friend declaration appears in a local class and | |
4198 | the name specified is an unqualified name, a prior | |
4199 | declaration is looked up without considering scopes | |
4200 | that are outside the innermost enclosing non-class | |
b9f673eb JM |
4201 | scope. For a friend function declaration, if there is |
4202 | no prior declaration, the program is ill-formed. For a | |
4203 | friend class declaration, if there is no prior | |
4204 | declaration, the class that is specified belongs to the | |
4205 | innermost enclosing non-class scope, but if it is | |
4206 | subsequently referenced, its name is not found by name | |
4207 | lookup until a matching declaration is provided in the | |
4208 | innermost enclosing nonclass scope. | |
4209 | ||
4210 | So just keep looking for a non-hidden binding. | |
d4d8c232 | 4211 | */ |
b9f673eb JM |
4212 | gcc_assert (TREE_CODE (binding) == TYPE_DECL); |
4213 | continue; | |
d4d8c232 | 4214 | } |
12cf89fa MM |
4215 | val = binding; |
4216 | break; | |
4217 | } | |
4218 | } | |
00e8de68 GDR |
4219 | |
4220 | /* Now lookup in namespace scopes. */ | |
4221 | if (!val) | |
29ef83de | 4222 | val = unqualified_namespace_lookup (name, flags); |
00e8de68 | 4223 | |
0c8ce11b VR |
4224 | /* If we have a single function from a using decl, pull it out. */ |
4225 | if (val && TREE_CODE (val) == OVERLOAD && !really_overloaded_fn (val)) | |
4226 | val = OVL_FUNCTION (val); | |
00e8de68 GDR |
4227 | |
4228 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
4229 | } | |
4230 | ||
4231 | tree | |
4232 | lookup_name_nonclass (tree name) | |
4233 | { | |
12cf89fa | 4234 | return lookup_name_real (name, 0, 1, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
4235 | } |
4236 | ||
4237 | tree | |
c166b898 | 4238 | lookup_function_nonclass (tree name, VEC(tree,gc) *args, bool block_p) |
00e8de68 | 4239 | { |
c8094d83 MS |
4240 | return |
4241 | lookup_arg_dependent (name, | |
4242 | lookup_name_real (name, 0, 1, block_p, 0, | |
12cf89fa MM |
4243 | LOOKUP_COMPLAIN), |
4244 | args); | |
00e8de68 GDR |
4245 | } |
4246 | ||
4247 | tree | |
10e6657a | 4248 | lookup_name (tree name) |
00e8de68 | 4249 | { |
10e6657a | 4250 | return lookup_name_real (name, 0, 0, /*block_p=*/true, 0, LOOKUP_COMPLAIN); |
00e8de68 GDR |
4251 | } |
4252 | ||
98803730 | 4253 | tree |
10e6657a | 4254 | lookup_name_prefer_type (tree name, int prefer_type) |
98803730 | 4255 | { |
10e6657a RH |
4256 | return lookup_name_real (name, prefer_type, 0, /*block_p=*/true, |
4257 | 0, LOOKUP_COMPLAIN); | |
98803730 MS |
4258 | } |
4259 | ||
461c6fce | 4260 | /* Look up NAME for type used in elaborated name specifier in |
29ef83de | 4261 | the scopes given by SCOPE. SCOPE can be either TS_CURRENT or |
87c465f5 KL |
4262 | TS_WITHIN_ENCLOSING_NON_CLASS. Although not implied by the |
4263 | name, more scopes are checked if cleanup or template parameter | |
4264 | scope is encountered. | |
29ef83de KL |
4265 | |
4266 | Unlike lookup_name_real, we make sure that NAME is actually | |
87c465f5 KL |
4267 | declared in the desired scope, not from inheritance, nor using |
4268 | directive. For using declaration, there is DR138 still waiting | |
13a44ee0 | 4269 | to be resolved. Hidden name coming from an earlier friend |
bd3d082e | 4270 | declaration is also returned. |
87c465f5 KL |
4271 | |
4272 | A TYPE_DECL best matching the NAME is returned. Catching error | |
4273 | and issuing diagnostics are caller's responsibility. */ | |
461c6fce KL |
4274 | |
4275 | tree | |
29ef83de | 4276 | lookup_type_scope (tree name, tag_scope scope) |
461c6fce KL |
4277 | { |
4278 | cxx_binding *iter = NULL; | |
4279 | tree val = NULL_TREE; | |
4280 | ||
4281 | timevar_push (TV_NAME_LOOKUP); | |
4282 | ||
4283 | /* Look in non-namespace scope first. */ | |
4284 | if (current_binding_level->kind != sk_namespace) | |
4285 | iter = outer_binding (name, NULL, /*class_p=*/ true); | |
4286 | for (; iter; iter = outer_binding (name, iter, /*class_p=*/ true)) | |
4287 | { | |
4288 | /* Check if this is the kind of thing we're looking for. | |
c8094d83 | 4289 | If SCOPE is TS_CURRENT, also make sure it doesn't come from |
29ef83de | 4290 | base class. For ITER->VALUE, we can simply use |
c8094d83 | 4291 | INHERITED_VALUE_BINDING_P. For ITER->TYPE, we have to use |
29ef83de | 4292 | our own check. |
461c6fce KL |
4293 | |
4294 | We check ITER->TYPE before ITER->VALUE in order to handle | |
4295 | typedef struct C {} C; | |
4296 | correctly. */ | |
4297 | ||
4298 | if (qualify_lookup (iter->type, LOOKUP_PREFER_TYPES) | |
29ef83de KL |
4299 | && (scope != ts_current |
4300 | || LOCAL_BINDING_P (iter) | |
461c6fce KL |
4301 | || DECL_CONTEXT (iter->type) == iter->scope->this_entity)) |
4302 | val = iter->type; | |
29ef83de KL |
4303 | else if ((scope != ts_current |
4304 | || !INHERITED_VALUE_BINDING_P (iter)) | |
461c6fce KL |
4305 | && qualify_lookup (iter->value, LOOKUP_PREFER_TYPES)) |
4306 | val = iter->value; | |
4307 | ||
4308 | if (val) | |
4309 | break; | |
4310 | } | |
4311 | ||
4312 | /* Look in namespace scope. */ | |
4313 | if (!val) | |
4314 | { | |
4315 | iter = cxx_scope_find_binding_for_name | |
4316 | (NAMESPACE_LEVEL (current_decl_namespace ()), name); | |
4317 | ||
4318 | if (iter) | |
4319 | { | |
bd3d082e | 4320 | /* If this is the kind of thing we're looking for, we're done. */ |
87c465f5 | 4321 | if (qualify_lookup (iter->type, LOOKUP_PREFER_TYPES)) |
461c6fce | 4322 | val = iter->type; |
87c465f5 | 4323 | else if (qualify_lookup (iter->value, LOOKUP_PREFER_TYPES)) |
461c6fce KL |
4324 | val = iter->value; |
4325 | } | |
c8094d83 | 4326 | |
461c6fce KL |
4327 | } |
4328 | ||
29ef83de | 4329 | /* Type found, check if it is in the allowed scopes, ignoring cleanup |
461c6fce KL |
4330 | and template parameter scopes. */ |
4331 | if (val) | |
4332 | { | |
4333 | struct cp_binding_level *b = current_binding_level; | |
4334 | while (b) | |
4335 | { | |
4336 | if (iter->scope == b) | |
4337 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, val); | |
4338 | ||
118dde55 JM |
4339 | if (b->kind == sk_cleanup || b->kind == sk_template_parms |
4340 | || b->kind == sk_function_parms) | |
461c6fce | 4341 | b = b->level_chain; |
29ef83de KL |
4342 | else if (b->kind == sk_class |
4343 | && scope == ts_within_enclosing_non_class) | |
4344 | b = b->level_chain; | |
461c6fce KL |
4345 | else |
4346 | break; | |
4347 | } | |
4348 | } | |
4349 | ||
4350 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
4351 | } | |
4352 | ||
00e8de68 GDR |
4353 | /* Similar to `lookup_name' but look only in the innermost non-class |
4354 | binding level. */ | |
4355 | ||
7655e009 | 4356 | tree |
461c6fce | 4357 | lookup_name_innermost_nonclass_level (tree name) |
00e8de68 GDR |
4358 | { |
4359 | struct cp_binding_level *b; | |
4360 | tree t = NULL_TREE; | |
4361 | ||
4362 | timevar_push (TV_NAME_LOOKUP); | |
4363 | b = innermost_nonclass_level (); | |
4364 | ||
4365 | if (b->kind == sk_namespace) | |
4366 | { | |
4367 | t = IDENTIFIER_NAMESPACE_VALUE (name); | |
4368 | ||
4369 | /* extern "C" function() */ | |
4370 | if (t != NULL_TREE && TREE_CODE (t) == TREE_LIST) | |
4371 | t = TREE_VALUE (t); | |
4372 | } | |
4373 | else if (IDENTIFIER_BINDING (name) | |
4374 | && LOCAL_BINDING_P (IDENTIFIER_BINDING (name))) | |
4375 | { | |
90ea9897 MM |
4376 | cxx_binding *binding; |
4377 | binding = IDENTIFIER_BINDING (name); | |
00e8de68 GDR |
4378 | while (1) |
4379 | { | |
90ea9897 MM |
4380 | if (binding->scope == b |
4381 | && !(TREE_CODE (binding->value) == VAR_DECL | |
4382 | && DECL_DEAD_FOR_LOCAL (binding->value))) | |
4383 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, binding->value); | |
00e8de68 GDR |
4384 | |
4385 | if (b->kind == sk_cleanup) | |
4386 | b = b->level_chain; | |
4387 | else | |
4388 | break; | |
4389 | } | |
4390 | } | |
4391 | ||
4392 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
4393 | } | |
4394 | ||
461c6fce | 4395 | /* Like lookup_name_innermost_nonclass_level, but for types. */ |
00e8de68 | 4396 | |
a5e6b29b | 4397 | static tree |
00e8de68 GDR |
4398 | lookup_type_current_level (tree name) |
4399 | { | |
926ce8bd | 4400 | tree t = NULL_TREE; |
00e8de68 GDR |
4401 | |
4402 | timevar_push (TV_NAME_LOOKUP); | |
50bc768d | 4403 | gcc_assert (current_binding_level->kind != sk_namespace); |
00e8de68 GDR |
4404 | |
4405 | if (REAL_IDENTIFIER_TYPE_VALUE (name) != NULL_TREE | |
4406 | && REAL_IDENTIFIER_TYPE_VALUE (name) != global_type_node) | |
4407 | { | |
4408 | struct cp_binding_level *b = current_binding_level; | |
4409 | while (1) | |
4410 | { | |
4411 | if (purpose_member (name, b->type_shadowed)) | |
4412 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, | |
0cbd7506 | 4413 | REAL_IDENTIFIER_TYPE_VALUE (name)); |
00e8de68 GDR |
4414 | if (b->kind == sk_cleanup) |
4415 | b = b->level_chain; | |
4416 | else | |
4417 | break; | |
4418 | } | |
4419 | } | |
4420 | ||
4421 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); | |
4422 | } | |
4423 | ||
5a167978 GDR |
4424 | /* [basic.lookup.koenig] */ |
4425 | /* A nonzero return value in the functions below indicates an error. */ | |
4426 | ||
4427 | struct arg_lookup | |
4428 | { | |
4429 | tree name; | |
c166b898 | 4430 | VEC(tree,gc) *args; |
5a167978 GDR |
4431 | tree namespaces; |
4432 | tree classes; | |
4433 | tree functions; | |
4434 | }; | |
4435 | ||
4436 | static bool arg_assoc (struct arg_lookup*, tree); | |
4437 | static bool arg_assoc_args (struct arg_lookup*, tree); | |
c166b898 | 4438 | static bool arg_assoc_args_vec (struct arg_lookup*, VEC(tree,gc) *); |
5a167978 GDR |
4439 | static bool arg_assoc_type (struct arg_lookup*, tree); |
4440 | static bool add_function (struct arg_lookup *, tree); | |
4441 | static bool arg_assoc_namespace (struct arg_lookup *, tree); | |
4442 | static bool arg_assoc_class (struct arg_lookup *, tree); | |
4443 | static bool arg_assoc_template_arg (struct arg_lookup*, tree); | |
4444 | ||
4445 | /* Add a function to the lookup structure. | |
4446 | Returns true on error. */ | |
4447 | ||
4448 | static bool | |
4449 | add_function (struct arg_lookup *k, tree fn) | |
4450 | { | |
4451 | /* We used to check here to see if the function was already in the list, | |
4452 | but that's O(n^2), which is just too expensive for function lookup. | |
4453 | Now we deal with the occasional duplicate in joust. In doing this, we | |
4454 | assume that the number of duplicates will be small compared to the | |
4455 | total number of functions being compared, which should usually be the | |
4456 | case. */ | |
4457 | ||
4458 | /* We must find only functions, or exactly one non-function. */ | |
c8094d83 | 4459 | if (!k->functions) |
5a167978 GDR |
4460 | k->functions = fn; |
4461 | else if (fn == k->functions) | |
4462 | ; | |
4463 | else if (is_overloaded_fn (k->functions) && is_overloaded_fn (fn)) | |
4464 | k->functions = build_overload (fn, k->functions); | |
4465 | else | |
4466 | { | |
4467 | tree f1 = OVL_CURRENT (k->functions); | |
4468 | tree f2 = fn; | |
4469 | if (is_overloaded_fn (f1)) | |
4470 | { | |
4471 | fn = f1; f1 = f2; f2 = fn; | |
4472 | } | |
dee15844 JM |
4473 | error ("%q+D is not a function,", f1); |
4474 | error (" conflict with %q+D", f2); | |
2a13a625 | 4475 | error (" in call to %qD", k->name); |
5a167978 GDR |
4476 | return true; |
4477 | } | |
4478 | ||
4479 | return false; | |
4480 | } | |
4481 | ||
86098eb8 JM |
4482 | /* Returns true iff CURRENT has declared itself to be an associated |
4483 | namespace of SCOPE via a strong using-directive (or transitive chain | |
4484 | thereof). Both are namespaces. */ | |
4485 | ||
4486 | bool | |
4487 | is_associated_namespace (tree current, tree scope) | |
4488 | { | |
4489 | tree seen = NULL_TREE; | |
4490 | tree todo = NULL_TREE; | |
4491 | tree t; | |
4492 | while (1) | |
4493 | { | |
4494 | if (scope == current) | |
4495 | return true; | |
4496 | seen = tree_cons (scope, NULL_TREE, seen); | |
4497 | for (t = DECL_NAMESPACE_ASSOCIATIONS (scope); t; t = TREE_CHAIN (t)) | |
4498 | if (!purpose_member (TREE_PURPOSE (t), seen)) | |
4499 | todo = tree_cons (TREE_PURPOSE (t), NULL_TREE, todo); | |
4500 | if (todo) | |
4501 | { | |
4502 | scope = TREE_PURPOSE (todo); | |
4503 | todo = TREE_CHAIN (todo); | |
4504 | } | |
4505 | else | |
4506 | return false; | |
4507 | } | |
4508 | } | |
4509 | ||
d63d5d0c ILT |
4510 | /* Return whether FN is a friend of an associated class of ARG. */ |
4511 | ||
4512 | static bool | |
4513 | friend_of_associated_class_p (tree arg, tree fn) | |
4514 | { | |
4515 | tree type; | |
4516 | ||
4517 | if (TYPE_P (arg)) | |
4518 | type = arg; | |
4519 | else if (type_unknown_p (arg)) | |
4520 | return false; | |
4521 | else | |
4522 | type = TREE_TYPE (arg); | |
4523 | ||
4524 | /* If TYPE is a class, the class itself and all base classes are | |
4525 | associated classes. */ | |
4526 | if (CLASS_TYPE_P (type)) | |
4527 | { | |
4528 | if (is_friend (type, fn)) | |
4529 | return true; | |
4530 | ||
4531 | if (TYPE_BINFO (type)) | |
4532 | { | |
4533 | tree binfo, base_binfo; | |
4534 | int i; | |
4535 | ||
4536 | for (binfo = TYPE_BINFO (type), i = 0; | |
4537 | BINFO_BASE_ITERATE (binfo, i, base_binfo); | |
4538 | i++) | |
4539 | if (is_friend (BINFO_TYPE (base_binfo), fn)) | |
4540 | return true; | |
4541 | } | |
4542 | } | |
4543 | ||
4544 | /* If TYPE is a class member, the class of which it is a member is | |
4545 | an associated class. */ | |
4546 | if ((CLASS_TYPE_P (type) | |
4547 | || TREE_CODE (type) == UNION_TYPE | |
4548 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
4549 | && TYPE_CONTEXT (type) | |
4550 | && CLASS_TYPE_P (TYPE_CONTEXT (type)) | |
4551 | && is_friend (TYPE_CONTEXT (type), fn)) | |
4552 | return true; | |
4553 | ||
4554 | return false; | |
4555 | } | |
4556 | ||
5a167978 GDR |
4557 | /* Add functions of a namespace to the lookup structure. |
4558 | Returns true on error. */ | |
4559 | ||
4560 | static bool | |
4561 | arg_assoc_namespace (struct arg_lookup *k, tree scope) | |
4562 | { | |
4563 | tree value; | |
4564 | ||
4565 | if (purpose_member (scope, k->namespaces)) | |
4566 | return 0; | |
4567 | k->namespaces = tree_cons (scope, NULL_TREE, k->namespaces); | |
86098eb8 JM |
4568 | |
4569 | /* Check out our super-users. */ | |
4570 | for (value = DECL_NAMESPACE_ASSOCIATIONS (scope); value; | |
4571 | value = TREE_CHAIN (value)) | |
4572 | if (arg_assoc_namespace (k, TREE_PURPOSE (value))) | |
4573 | return true; | |
c8094d83 | 4574 | |
4cfaec1c JM |
4575 | /* Also look down into inline namespaces. */ |
4576 | for (value = DECL_NAMESPACE_USING (scope); value; | |
4577 | value = TREE_CHAIN (value)) | |
4578 | if (is_associated_namespace (scope, TREE_PURPOSE (value))) | |
4579 | if (arg_assoc_namespace (k, TREE_PURPOSE (value))) | |
4580 | return true; | |
4581 | ||
5a167978 GDR |
4582 | value = namespace_binding (k->name, scope); |
4583 | if (!value) | |
4584 | return false; | |
4585 | ||
4586 | for (; value; value = OVL_NEXT (value)) | |
d63d5d0c ILT |
4587 | { |
4588 | /* We don't want to find arbitrary hidden functions via argument | |
4589 | dependent lookup. We only want to find friends of associated | |
4590 | classes. */ | |
4591 | if (hidden_name_p (OVL_CURRENT (value))) | |
4592 | { | |
c166b898 ILT |
4593 | unsigned int ix; |
4594 | tree arg; | |
d63d5d0c | 4595 | |
c166b898 ILT |
4596 | for (ix = 0; VEC_iterate (tree, k->args, ix, arg); ++ix) |
4597 | if (friend_of_associated_class_p (arg, OVL_CURRENT (value))) | |
d63d5d0c | 4598 | break; |
c166b898 | 4599 | if (ix >= VEC_length (tree, k->args)) |
d63d5d0c ILT |
4600 | continue; |
4601 | } | |
4602 | ||
4603 | if (add_function (k, OVL_CURRENT (value))) | |
4604 | return true; | |
4605 | } | |
c8094d83 | 4606 | |
5a167978 GDR |
4607 | return false; |
4608 | } | |
4609 | ||
4610 | /* Adds everything associated with a template argument to the lookup | |
4611 | structure. Returns true on error. */ | |
4612 | ||
4613 | static bool | |
4614 | arg_assoc_template_arg (struct arg_lookup *k, tree arg) | |
4615 | { | |
4616 | /* [basic.lookup.koenig] | |
4617 | ||
4618 | If T is a template-id, its associated namespaces and classes are | |
4619 | ... the namespaces and classes associated with the types of the | |
4620 | template arguments provided for template type parameters | |
4621 | (excluding template template parameters); the namespaces in which | |
4622 | any template template arguments are defined; and the classes in | |
4623 | which any member templates used as template template arguments | |
4624 | are defined. [Note: non-type template arguments do not | |
4625 | contribute to the set of associated namespaces. ] */ | |
4626 | ||
4627 | /* Consider first template template arguments. */ | |
4628 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
4629 | || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE) | |
4630 | return false; | |
4631 | else if (TREE_CODE (arg) == TEMPLATE_DECL) | |
4632 | { | |
4633 | tree ctx = CP_DECL_CONTEXT (arg); | |
4634 | ||
4635 | /* It's not a member template. */ | |
4636 | if (TREE_CODE (ctx) == NAMESPACE_DECL) | |
0cbd7506 | 4637 | return arg_assoc_namespace (k, ctx); |
5a167978 | 4638 | /* Otherwise, it must be member template. */ |
c8094d83 | 4639 | else |
0cbd7506 | 4640 | return arg_assoc_class (k, ctx); |
5a167978 | 4641 | } |
ba796308 DG |
4642 | /* It's an argument pack; handle it recursively. */ |
4643 | else if (ARGUMENT_PACK_P (arg)) | |
4644 | { | |
4645 | tree args = ARGUMENT_PACK_ARGS (arg); | |
4646 | int i, len = TREE_VEC_LENGTH (args); | |
4647 | for (i = 0; i < len; ++i) | |
4648 | if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, i))) | |
4649 | return true; | |
4650 | ||
4651 | return false; | |
4652 | } | |
5a167978 GDR |
4653 | /* It's not a template template argument, but it is a type template |
4654 | argument. */ | |
4655 | else if (TYPE_P (arg)) | |
4656 | return arg_assoc_type (k, arg); | |
4657 | /* It's a non-type template argument. */ | |
4658 | else | |
4659 | return false; | |
4660 | } | |
4661 | ||
4662 | /* Adds everything associated with class to the lookup structure. | |
4663 | Returns true on error. */ | |
4664 | ||
4665 | static bool | |
4666 | arg_assoc_class (struct arg_lookup *k, tree type) | |
4667 | { | |
4668 | tree list, friends, context; | |
4669 | int i; | |
c8094d83 | 4670 | |
5a167978 GDR |
4671 | /* Backend build structures, such as __builtin_va_list, aren't |
4672 | affected by all this. */ | |
4673 | if (!CLASS_TYPE_P (type)) | |
4674 | return false; | |
4675 | ||
4676 | if (purpose_member (type, k->classes)) | |
4677 | return false; | |
4678 | k->classes = tree_cons (type, NULL_TREE, k->classes); | |
c8094d83 | 4679 | |
b1cc95ce | 4680 | context = decl_namespace_context (type); |
5a167978 GDR |
4681 | if (arg_assoc_namespace (k, context)) |
4682 | return true; | |
ccb14335 NS |
4683 | |
4684 | if (TYPE_BINFO (type)) | |
fa743e8c NS |
4685 | { |
4686 | /* Process baseclasses. */ | |
4687 | tree binfo, base_binfo; | |
c8094d83 | 4688 | |
fa743e8c NS |
4689 | for (binfo = TYPE_BINFO (type), i = 0; |
4690 | BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
4691 | if (arg_assoc_class (k, BINFO_TYPE (base_binfo))) | |
4692 | return true; | |
4693 | } | |
c8094d83 | 4694 | |
5a167978 | 4695 | /* Process friends. */ |
c8094d83 | 4696 | for (list = DECL_FRIENDLIST (TYPE_MAIN_DECL (type)); list; |
5a167978 GDR |
4697 | list = TREE_CHAIN (list)) |
4698 | if (k->name == FRIEND_NAME (list)) | |
c8094d83 | 4699 | for (friends = FRIEND_DECLS (list); friends; |
5a167978 | 4700 | friends = TREE_CHAIN (friends)) |
c8b2e872 MM |
4701 | { |
4702 | tree fn = TREE_VALUE (friends); | |
4703 | ||
4704 | /* Only interested in global functions with potentially hidden | |
4705 | (i.e. unqualified) declarations. */ | |
4706 | if (CP_DECL_CONTEXT (fn) != context) | |
4707 | continue; | |
4708 | /* Template specializations are never found by name lookup. | |
4709 | (Templates themselves can be found, but not template | |
4710 | specializations.) */ | |
4711 | if (TREE_CODE (fn) == FUNCTION_DECL && DECL_USE_TEMPLATE (fn)) | |
4712 | continue; | |
4713 | if (add_function (k, fn)) | |
5a167978 | 4714 | return true; |
c8b2e872 | 4715 | } |
5a167978 GDR |
4716 | |
4717 | /* Process template arguments. */ | |
c8094d83 | 4718 | if (CLASSTYPE_TEMPLATE_INFO (type) |
146d3c99 | 4719 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type))) |
5a167978 GDR |
4720 | { |
4721 | list = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type)); | |
c8094d83 | 4722 | for (i = 0; i < TREE_VEC_LENGTH (list); ++i) |
0cbd7506 | 4723 | arg_assoc_template_arg (k, TREE_VEC_ELT (list, i)); |
5a167978 GDR |
4724 | } |
4725 | ||
4726 | return false; | |
4727 | } | |
4728 | ||
4729 | /* Adds everything associated with a given type. | |
4730 | Returns 1 on error. */ | |
4731 | ||
4732 | static bool | |
4733 | arg_assoc_type (struct arg_lookup *k, tree type) | |
4734 | { | |
4735 | /* As we do not get the type of non-type dependent expressions | |
4736 | right, we can end up with such things without a type. */ | |
4737 | if (!type) | |
4738 | return false; | |
4739 | ||
4740 | if (TYPE_PTRMEM_P (type)) | |
4741 | { | |
4742 | /* Pointer to member: associate class type and value type. */ | |
4743 | if (arg_assoc_type (k, TYPE_PTRMEM_CLASS_TYPE (type))) | |
4744 | return true; | |
4745 | return arg_assoc_type (k, TYPE_PTRMEM_POINTED_TO_TYPE (type)); | |
4746 | } | |
4747 | else switch (TREE_CODE (type)) | |
4748 | { | |
4749 | case ERROR_MARK: | |
4750 | return false; | |
4751 | case VOID_TYPE: | |
4752 | case INTEGER_TYPE: | |
4753 | case REAL_TYPE: | |
4754 | case COMPLEX_TYPE: | |
4755 | case VECTOR_TYPE: | |
5a167978 | 4756 | case BOOLEAN_TYPE: |
50a70b6b | 4757 | case FIXED_POINT_TYPE: |
3feb128f | 4758 | case DECLTYPE_TYPE: |
5a167978 GDR |
4759 | return false; |
4760 | case RECORD_TYPE: | |
4761 | if (TYPE_PTRMEMFUNC_P (type)) | |
4762 | return arg_assoc_type (k, TYPE_PTRMEMFUNC_FN_TYPE (type)); | |
4763 | return arg_assoc_class (k, type); | |
4764 | case POINTER_TYPE: | |
4765 | case REFERENCE_TYPE: | |
4766 | case ARRAY_TYPE: | |
4767 | return arg_assoc_type (k, TREE_TYPE (type)); | |
4768 | case UNION_TYPE: | |
4769 | case ENUMERAL_TYPE: | |
b1cc95ce | 4770 | return arg_assoc_namespace (k, decl_namespace_context (type)); |
5a167978 GDR |
4771 | case METHOD_TYPE: |
4772 | /* The basetype is referenced in the first arg type, so just | |
4773 | fall through. */ | |
4774 | case FUNCTION_TYPE: | |
4775 | /* Associate the parameter types. */ | |
4776 | if (arg_assoc_args (k, TYPE_ARG_TYPES (type))) | |
4777 | return true; | |
4778 | /* Associate the return type. */ | |
4779 | return arg_assoc_type (k, TREE_TYPE (type)); | |
4780 | case TEMPLATE_TYPE_PARM: | |
4781 | case BOUND_TEMPLATE_TEMPLATE_PARM: | |
4782 | return false; | |
4783 | case TYPENAME_TYPE: | |
4784 | return false; | |
4785 | case LANG_TYPE: | |
09357846 JM |
4786 | gcc_assert (type == unknown_type_node |
4787 | || type == init_list_type_node); | |
315fb5db | 4788 | return false; |
5d80a306 DG |
4789 | case TYPE_PACK_EXPANSION: |
4790 | return arg_assoc_type (k, PACK_EXPANSION_PATTERN (type)); | |
5d80a306 | 4791 | |
5a167978 | 4792 | default: |
315fb5db | 4793 | gcc_unreachable (); |
5a167978 GDR |
4794 | } |
4795 | return false; | |
4796 | } | |
4797 | ||
4798 | /* Adds everything associated with arguments. Returns true on error. */ | |
4799 | ||
4800 | static bool | |
4801 | arg_assoc_args (struct arg_lookup *k, tree args) | |
4802 | { | |
4803 | for (; args; args = TREE_CHAIN (args)) | |
4804 | if (arg_assoc (k, TREE_VALUE (args))) | |
4805 | return true; | |
4806 | return false; | |
4807 | } | |
4808 | ||
c166b898 ILT |
4809 | /* Adds everything associated with an argument vector. Returns true |
4810 | on error. */ | |
4811 | ||
4812 | static bool | |
4813 | arg_assoc_args_vec (struct arg_lookup *k, VEC(tree,gc) *args) | |
4814 | { | |
4815 | unsigned int ix; | |
4816 | tree arg; | |
4817 | ||
4818 | for (ix = 0; VEC_iterate (tree, args, ix, arg); ++ix) | |
4819 | if (arg_assoc (k, arg)) | |
4820 | return true; | |
4821 | return false; | |
4822 | } | |
4823 | ||
5a167978 GDR |
4824 | /* Adds everything associated with a given tree_node. Returns 1 on error. */ |
4825 | ||
4826 | static bool | |
4827 | arg_assoc (struct arg_lookup *k, tree n) | |
4828 | { | |
4829 | if (n == error_mark_node) | |
4830 | return false; | |
4831 | ||
4832 | if (TYPE_P (n)) | |
4833 | return arg_assoc_type (k, n); | |
4834 | ||
4835 | if (! type_unknown_p (n)) | |
4836 | return arg_assoc_type (k, TREE_TYPE (n)); | |
4837 | ||
4838 | if (TREE_CODE (n) == ADDR_EXPR) | |
4839 | n = TREE_OPERAND (n, 0); | |
4840 | if (TREE_CODE (n) == COMPONENT_REF) | |
4841 | n = TREE_OPERAND (n, 1); | |
4842 | if (TREE_CODE (n) == OFFSET_REF) | |
4843 | n = TREE_OPERAND (n, 1); | |
4844 | while (TREE_CODE (n) == TREE_LIST) | |
4845 | n = TREE_VALUE (n); | |
4846 | if (TREE_CODE (n) == BASELINK) | |
4847 | n = BASELINK_FUNCTIONS (n); | |
4848 | ||
4849 | if (TREE_CODE (n) == FUNCTION_DECL) | |
4850 | return arg_assoc_type (k, TREE_TYPE (n)); | |
4851 | if (TREE_CODE (n) == TEMPLATE_ID_EXPR) | |
4852 | { | |
4853 | /* [basic.lookup.koenig] | |
4854 | ||
4855 | If T is a template-id, its associated namespaces and classes | |
4856 | are the namespace in which the template is defined; for | |
4857 | member templates, the member template's class... */ | |
be93747e | 4858 | tree templ = TREE_OPERAND (n, 0); |
5a167978 GDR |
4859 | tree args = TREE_OPERAND (n, 1); |
4860 | tree ctx; | |
4861 | int ix; | |
4862 | ||
be93747e KG |
4863 | if (TREE_CODE (templ) == COMPONENT_REF) |
4864 | templ = TREE_OPERAND (templ, 1); | |
c8094d83 | 4865 | |
5a167978 GDR |
4866 | /* First, the template. There may actually be more than one if |
4867 | this is an overloaded function template. But, in that case, | |
4868 | we only need the first; all the functions will be in the same | |
4869 | namespace. */ | |
be93747e | 4870 | templ = OVL_CURRENT (templ); |
5a167978 | 4871 | |
be93747e | 4872 | ctx = CP_DECL_CONTEXT (templ); |
c8094d83 | 4873 | |
5a167978 GDR |
4874 | if (TREE_CODE (ctx) == NAMESPACE_DECL) |
4875 | { | |
4876 | if (arg_assoc_namespace (k, ctx) == 1) | |
4877 | return true; | |
4878 | } | |
4879 | /* It must be a member template. */ | |
4880 | else if (arg_assoc_class (k, ctx) == 1) | |
4881 | return true; | |
4882 | ||
4883 | /* Now the arguments. */ | |
c19aaba5 NS |
4884 | if (args) |
4885 | for (ix = TREE_VEC_LENGTH (args); ix--;) | |
4886 | if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, ix)) == 1) | |
4887 | return true; | |
5a167978 | 4888 | } |
c1cca8d4 | 4889 | else if (TREE_CODE (n) == OVERLOAD) |
5a167978 | 4890 | { |
5a167978 GDR |
4891 | for (; n; n = OVL_CHAIN (n)) |
4892 | if (arg_assoc_type (k, TREE_TYPE (OVL_FUNCTION (n)))) | |
4893 | return true; | |
4894 | } | |
4895 | ||
4896 | return false; | |
4897 | } | |
4898 | ||
4899 | /* Performs Koenig lookup depending on arguments, where fns | |
4900 | are the functions found in normal lookup. */ | |
4901 | ||
4902 | tree | |
c166b898 | 4903 | lookup_arg_dependent (tree name, tree fns, VEC(tree,gc) *args) |
5a167978 GDR |
4904 | { |
4905 | struct arg_lookup k; | |
5a167978 GDR |
4906 | |
4907 | timevar_push (TV_NAME_LOOKUP); | |
d63d5d0c ILT |
4908 | |
4909 | /* Remove any hidden friend functions from the list of functions | |
4910 | found so far. They will be added back by arg_assoc_class as | |
4911 | appropriate. */ | |
4912 | fns = remove_hidden_names (fns); | |
4913 | ||
5a167978 | 4914 | k.name = name; |
d63d5d0c | 4915 | k.args = args; |
5a167978 GDR |
4916 | k.functions = fns; |
4917 | k.classes = NULL_TREE; | |
4918 | ||
20ac1e03 DG |
4919 | /* We previously performed an optimization here by setting |
4920 | NAMESPACES to the current namespace when it was safe. However, DR | |
4921 | 164 says that namespaces that were already searched in the first | |
4922 | stage of template processing are searched again (potentially | |
4923 | picking up later definitions) in the second stage. */ | |
4924 | k.namespaces = NULL_TREE; | |
5a167978 | 4925 | |
c166b898 | 4926 | arg_assoc_args_vec (&k, args); |
4860b874 NS |
4927 | |
4928 | fns = k.functions; | |
4929 | ||
4930 | if (fns | |
4931 | && TREE_CODE (fns) != VAR_DECL | |
4932 | && !is_overloaded_fn (fns)) | |
4933 | { | |
4934 | error ("argument dependent lookup finds %q+D", fns); | |
4935 | error (" in call to %qD", name); | |
4936 | fns = error_mark_node; | |
4937 | } | |
4938 | ||
4939 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, fns); | |
5a167978 GDR |
4940 | } |
4941 | ||
00e8de68 GDR |
4942 | /* Add namespace to using_directives. Return NULL_TREE if nothing was |
4943 | changed (i.e. there was already a directive), or the fresh | |
4944 | TREE_LIST otherwise. */ | |
4945 | ||
a5e6b29b | 4946 | static tree |
00e8de68 GDR |
4947 | push_using_directive (tree used) |
4948 | { | |
4949 | tree ud = current_binding_level->using_directives; | |
4950 | tree iter, ancestor; | |
4951 | ||
4952 | timevar_push (TV_NAME_LOOKUP); | |
4953 | /* Check if we already have this. */ | |
4954 | if (purpose_member (used, ud) != NULL_TREE) | |
4955 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE); | |
4956 | ||
4957 | ancestor = namespace_ancestor (current_decl_namespace (), used); | |
4958 | ud = current_binding_level->using_directives; | |
4959 | ud = tree_cons (used, ancestor, ud); | |
4960 | current_binding_level->using_directives = ud; | |
4961 | ||
4962 | /* Recursively add all namespaces used. */ | |
4963 | for (iter = DECL_NAMESPACE_USING (used); iter; iter = TREE_CHAIN (iter)) | |
4964 | push_using_directive (TREE_PURPOSE (iter)); | |
4965 | ||
4966 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, ud); | |
4967 | } | |
4968 | ||
4969 | /* The type TYPE is being declared. If it is a class template, or a | |
4970 | specialization of a class template, do any processing required and | |
4971 | perform error-checking. If IS_FRIEND is nonzero, this TYPE is | |
4972 | being declared a friend. B is the binding level at which this TYPE | |
4973 | should be bound. | |
4974 | ||
4975 | Returns the TYPE_DECL for TYPE, which may have been altered by this | |
4976 | processing. */ | |
4977 | ||
4978 | static tree | |
bd3d082e | 4979 | maybe_process_template_type_declaration (tree type, int is_friend, |
0cbd7506 | 4980 | cxx_scope *b) |
00e8de68 GDR |
4981 | { |
4982 | tree decl = TYPE_NAME (type); | |
4983 | ||
4984 | if (processing_template_parmlist) | |
4985 | /* You can't declare a new template type in a template parameter | |
4986 | list. But, you can declare a non-template type: | |
4987 | ||
0cbd7506 | 4988 | template <class A*> struct S; |
00e8de68 GDR |
4989 | |
4990 | is a forward-declaration of `A'. */ | |
4991 | ; | |
c43e95f8 MM |
4992 | else if (b->kind == sk_namespace |
4993 | && current_binding_level->kind != sk_namespace) | |
4994 | /* If this new type is being injected into a containing scope, | |
4995 | then it's not a template type. */ | |
4996 | ; | |
00e8de68 GDR |
4997 | else |
4998 | { | |
9e1e64ec PC |
4999 | gcc_assert (MAYBE_CLASS_TYPE_P (type) |
5000 | || TREE_CODE (type) == ENUMERAL_TYPE); | |
00e8de68 GDR |
5001 | |
5002 | if (processing_template_decl) | |
5003 | { | |
5004 | /* This may change after the call to | |
5005 | push_template_decl_real, but we want the original value. */ | |
5006 | tree name = DECL_NAME (decl); | |
5007 | ||
bd3d082e | 5008 | decl = push_template_decl_real (decl, is_friend); |
79faac54 PC |
5009 | if (decl == error_mark_node) |
5010 | return error_mark_node; | |
5011 | ||
00e8de68 GDR |
5012 | /* If the current binding level is the binding level for the |
5013 | template parameters (see the comment in | |
5014 | begin_template_parm_list) and the enclosing level is a class | |
5015 | scope, and we're not looking at a friend, push the | |
5016 | declaration of the member class into the class scope. In the | |
5017 | friend case, push_template_decl will already have put the | |
5018 | friend into global scope, if appropriate. */ | |
5019 | if (TREE_CODE (type) != ENUMERAL_TYPE | |
bd3d082e | 5020 | && !is_friend && b->kind == sk_template_parms |
00e8de68 GDR |
5021 | && b->level_chain->kind == sk_class) |
5022 | { | |
5023 | finish_member_declaration (CLASSTYPE_TI_TEMPLATE (type)); | |
e57df6fe | 5024 | |
00e8de68 GDR |
5025 | if (!COMPLETE_TYPE_P (current_class_type)) |
5026 | { | |
5027 | maybe_add_class_template_decl_list (current_class_type, | |
5028 | type, /*friend_p=*/0); | |
c72a1a86 | 5029 | /* Put this UTD in the table of UTDs for the class. */ |
e57df6fe KL |
5030 | if (CLASSTYPE_NESTED_UTDS (current_class_type) == NULL) |
5031 | CLASSTYPE_NESTED_UTDS (current_class_type) = | |
5032 | binding_table_new (SCOPE_DEFAULT_HT_SIZE); | |
5033 | ||
5034 | binding_table_insert | |
5035 | (CLASSTYPE_NESTED_UTDS (current_class_type), name, type); | |
00e8de68 GDR |
5036 | } |
5037 | } | |
5038 | } | |
5039 | } | |
5040 | ||
5041 | return decl; | |
5042 | } | |
5043 | ||
5a24482e KL |
5044 | /* Push a tag name NAME for struct/class/union/enum type TYPE. In case |
5045 | that the NAME is a class template, the tag is processed but not pushed. | |
5046 | ||
5047 | The pushed scope depend on the SCOPE parameter: | |
5048 | - When SCOPE is TS_CURRENT, put it into the inner-most non-sk_cleanup | |
5049 | scope. | |
5050 | - When SCOPE is TS_GLOBAL, put it in the inner-most non-class and | |
5051 | non-template-parameter scope. This case is needed for forward | |
5052 | declarations. | |
5053 | - When SCOPE is TS_WITHIN_ENCLOSING_NON_CLASS, this is similar to | |
5054 | TS_GLOBAL case except that names within template-parameter scopes | |
5055 | are not pushed at all. | |
5056 | ||
c6f9f83b | 5057 | Returns TYPE upon success and ERROR_MARK_NODE otherwise. */ |
00e8de68 | 5058 | |
c6f9f83b | 5059 | tree |
bd3d082e | 5060 | pushtag (tree name, tree type, tag_scope scope) |
00e8de68 | 5061 | { |
926ce8bd | 5062 | struct cp_binding_level *b; |
6a000704 | 5063 | tree decl; |
00e8de68 GDR |
5064 | |
5065 | timevar_push (TV_NAME_LOOKUP); | |
5066 | b = current_binding_level; | |
7c82a41e MM |
5067 | while (/* Cleanup scopes are not scopes from the point of view of |
5068 | the language. */ | |
5069 | b->kind == sk_cleanup | |
b344d949 JM |
5070 | /* Neither are function parameter scopes. */ |
5071 | || b->kind == sk_function_parms | |
7c82a41e MM |
5072 | /* Neither are the scopes used to hold template parameters |
5073 | for an explicit specialization. For an ordinary template | |
5074 | declaration, these scopes are not scopes from the point of | |
5a24482e KL |
5075 | view of the language. */ |
5076 | || (b->kind == sk_template_parms | |
5077 | && (b->explicit_spec_p || scope == ts_global)) | |
00e8de68 | 5078 | || (b->kind == sk_class |
bd3d082e | 5079 | && (scope != ts_current |
00e8de68 GDR |
5080 | /* We may be defining a new type in the initializer |
5081 | of a static member variable. We allow this when | |
5082 | not pedantic, and it is particularly useful for | |
5083 | type punning via an anonymous union. */ | |
5084 | || COMPLETE_TYPE_P (b->this_entity)))) | |
5085 | b = b->level_chain; | |
5086 | ||
6a000704 | 5087 | gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE); |
3db45ab5 | 5088 | |
6a000704 NS |
5089 | /* Do C++ gratuitous typedefing. */ |
5090 | if (IDENTIFIER_TYPE_VALUE (name) != type) | |
00e8de68 | 5091 | { |
6a000704 NS |
5092 | tree tdef; |
5093 | int in_class = 0; | |
5094 | tree context = TYPE_CONTEXT (type); | |
00e8de68 | 5095 | |
6a000704 NS |
5096 | if (! context) |
5097 | { | |
5098 | tree cs = current_scope (); | |
3db45ab5 | 5099 | |
6a000704 NS |
5100 | if (scope == ts_current) |
5101 | context = cs; | |
5102 | else if (cs != NULL_TREE && TYPE_P (cs)) | |
5103 | /* When declaring a friend class of a local class, we want | |
5104 | to inject the newly named class into the scope | |
5105 | containing the local class, not the namespace | |
5106 | scope. */ | |
5107 | context = decl_function_context (get_type_decl (cs)); | |
5108 | } | |
5109 | if (!context) | |
5110 | context = current_namespace; | |
bd3d082e | 5111 | |
6a000704 NS |
5112 | if (b->kind == sk_class |
5113 | || (b->kind == sk_template_parms | |
5114 | && b->level_chain->kind == sk_class)) | |
5115 | in_class = 1; | |
00e8de68 | 5116 | |
6a000704 NS |
5117 | if (current_lang_name == lang_name_java) |
5118 | TYPE_FOR_JAVA (type) = 1; | |
00e8de68 | 5119 | |
6a000704 NS |
5120 | tdef = create_implicit_typedef (name, type); |
5121 | DECL_CONTEXT (tdef) = FROB_CONTEXT (context); | |
5122 | if (scope == ts_within_enclosing_non_class) | |
00e8de68 | 5123 | { |
6a000704 NS |
5124 | /* This is a friend. Make this TYPE_DECL node hidden from |
5125 | ordinary name lookup. Its corresponding TEMPLATE_DECL | |
5126 | will be marked in push_template_decl_real. */ | |
5127 | retrofit_lang_decl (tdef); | |
5128 | DECL_ANTICIPATED (tdef) = 1; | |
5129 | DECL_FRIEND_P (tdef) = 1; | |
5130 | } | |
e57df6fe | 5131 | |
6a000704 NS |
5132 | decl = maybe_process_template_type_declaration |
5133 | (type, scope == ts_within_enclosing_non_class, b); | |
5134 | if (decl == error_mark_node) | |
5135 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
3db45ab5 | 5136 | |
6a000704 NS |
5137 | if (b->kind == sk_class) |
5138 | { | |
0efc4442 DS |
5139 | if (!TYPE_BEING_DEFINED (current_class_type)) |
5140 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
5141 | ||
6a000704 NS |
5142 | if (!PROCESSING_REAL_TEMPLATE_DECL_P ()) |
5143 | /* Put this TYPE_DECL on the TYPE_FIELDS list for the | |
5144 | class. But if it's a member template class, we want | |
5145 | the TEMPLATE_DECL, not the TYPE_DECL, so this is done | |
5146 | later. */ | |
5147 | finish_member_declaration (decl); | |
5148 | else | |
5149 | pushdecl_class_level (decl); | |
00e8de68 | 5150 | } |
6a000704 | 5151 | else if (b->kind != sk_template_parms) |
c5f8391c SE |
5152 | { |
5153 | decl = pushdecl_with_scope (decl, b, /*is_friend=*/false); | |
5154 | if (decl == error_mark_node) | |
5155 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl); | |
5156 | } | |
6a000704 | 5157 | |
dc3ca06f SM |
5158 | if (! in_class) |
5159 | set_identifier_type_value_with_scope (name, tdef, b); | |
5160 | ||
6a000704 NS |
5161 | TYPE_CONTEXT (type) = DECL_CONTEXT (decl); |
5162 | ||
5163 | /* If this is a local class, keep track of it. We need this | |
5164 | information for name-mangling, and so that it is possible to | |
5165 | find all function definitions in a translation unit in a | |
5166 | convenient way. (It's otherwise tricky to find a member | |
5167 | function definition it's only pointed to from within a local | |
5168 | class.) */ | |
5169 | if (TYPE_CONTEXT (type) | |
5170 | && TREE_CODE (TYPE_CONTEXT (type)) == FUNCTION_DECL) | |
5171 | VEC_safe_push (tree, gc, local_classes, type); | |
00e8de68 | 5172 | } |
6a000704 NS |
5173 | if (b->kind == sk_class |
5174 | && !COMPLETE_TYPE_P (current_class_type)) | |
00e8de68 | 5175 | { |
6a000704 NS |
5176 | maybe_add_class_template_decl_list (current_class_type, |
5177 | type, /*friend_p=*/0); | |
3db45ab5 | 5178 | |
6a000704 NS |
5179 | if (CLASSTYPE_NESTED_UTDS (current_class_type) == NULL) |
5180 | CLASSTYPE_NESTED_UTDS (current_class_type) | |
5181 | = binding_table_new (SCOPE_DEFAULT_HT_SIZE); | |
3db45ab5 | 5182 | |
6a000704 NS |
5183 | binding_table_insert |
5184 | (CLASSTYPE_NESTED_UTDS (current_class_type), name, type); | |
00e8de68 | 5185 | } |
6a000704 NS |
5186 | |
5187 | decl = TYPE_NAME (type); | |
5188 | gcc_assert (TREE_CODE (decl) == TYPE_DECL); | |
5189 | TYPE_STUB_DECL (type) = decl; | |
5190 | ||
b9e75696 JM |
5191 | /* Set type visibility now if this is a forward declaration. */ |
5192 | TREE_PUBLIC (decl) = 1; | |
5193 | determine_visibility (decl); | |
5194 | ||
c6f9f83b | 5195 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, type); |
00e8de68 GDR |
5196 | } |
5197 | \f | |
00e8de68 GDR |
5198 | /* Subroutines for reverting temporarily to top-level for instantiation |
5199 | of templates and such. We actually need to clear out the class- and | |
5200 | local-value slots of all identifiers, so that only the global values | |
5201 | are at all visible. Simply setting current_binding_level to the global | |
5202 | scope isn't enough, because more binding levels may be pushed. */ | |
5203 | struct saved_scope *scope_chain; | |
5204 | ||
f44b0c8e MM |
5205 | /* If ID has not already been marked, add an appropriate binding to |
5206 | *OLD_BINDINGS. */ | |
89b578be | 5207 | |
f44b0c8e | 5208 | static void |
d4e6fecb | 5209 | store_binding (tree id, VEC(cxx_saved_binding,gc) **old_bindings) |
89b578be MM |
5210 | { |
5211 | cxx_saved_binding *saved; | |
89b578be | 5212 | |
39fb05d0 | 5213 | if (!id || !IDENTIFIER_BINDING (id)) |
f44b0c8e | 5214 | return; |
89b578be | 5215 | |
f44b0c8e MM |
5216 | if (IDENTIFIER_MARKED (id)) |
5217 | return; | |
c8094d83 | 5218 | |
f44b0c8e | 5219 | IDENTIFIER_MARKED (id) = 1; |
89b578be | 5220 | |
d4e6fecb | 5221 | saved = VEC_safe_push (cxx_saved_binding, gc, *old_bindings, NULL); |
89b578be MM |
5222 | saved->identifier = id; |
5223 | saved->binding = IDENTIFIER_BINDING (id); | |
89b578be MM |
5224 | saved->real_type_value = REAL_IDENTIFIER_TYPE_VALUE (id); |
5225 | IDENTIFIER_BINDING (id) = NULL; | |
89b578be MM |
5226 | } |
5227 | ||
f44b0c8e | 5228 | static void |
d4e6fecb | 5229 | store_bindings (tree names, VEC(cxx_saved_binding,gc) **old_bindings) |
00e8de68 GDR |
5230 | { |
5231 | tree t; | |
00e8de68 GDR |
5232 | |
5233 | timevar_push (TV_NAME_LOOKUP); | |
5234 | for (t = names; t; t = TREE_CHAIN (t)) | |
5235 | { | |
5236 | tree id; | |
00e8de68 GDR |
5237 | |
5238 | if (TREE_CODE (t) == TREE_LIST) | |
5239 | id = TREE_PURPOSE (t); | |
5240 | else | |
5241 | id = DECL_NAME (t); | |
5242 | ||
f44b0c8e | 5243 | store_binding (id, old_bindings); |
00e8de68 | 5244 | } |
f44b0c8e | 5245 | timevar_pop (TV_NAME_LOOKUP); |
00e8de68 GDR |
5246 | } |
5247 | ||
89b578be MM |
5248 | /* Like store_bindings, but NAMES is a vector of cp_class_binding |
5249 | objects, rather than a TREE_LIST. */ | |
5250 | ||
f44b0c8e | 5251 | static void |
c8094d83 | 5252 | store_class_bindings (VEC(cp_class_binding,gc) *names, |
d4e6fecb | 5253 | VEC(cxx_saved_binding,gc) **old_bindings) |
89b578be MM |
5254 | { |
5255 | size_t i; | |
5256 | cp_class_binding *cb; | |
89b578be MM |
5257 | |
5258 | timevar_push (TV_NAME_LOOKUP); | |
9ba5ff0f | 5259 | for (i = 0; VEC_iterate(cp_class_binding, names, i, cb); ++i) |
f44b0c8e MM |
5260 | store_binding (cb->identifier, old_bindings); |
5261 | timevar_pop (TV_NAME_LOOKUP); | |
89b578be MM |
5262 | } |
5263 | ||
00e8de68 | 5264 | void |
c353b8e3 | 5265 | push_to_top_level (void) |
00e8de68 GDR |
5266 | { |
5267 | struct saved_scope *s; | |
5268 | struct cp_binding_level *b; | |
f44b0c8e MM |
5269 | cxx_saved_binding *sb; |
5270 | size_t i; | |
30bcc028 | 5271 | bool need_pop; |
00e8de68 GDR |
5272 | |
5273 | timevar_push (TV_NAME_LOOKUP); | |
99dd239f | 5274 | s = GGC_CNEW (struct saved_scope); |
00e8de68 GDR |
5275 | |
5276 | b = scope_chain ? current_binding_level : 0; | |
5277 | ||
5278 | /* If we're in the middle of some function, save our state. */ | |
5279 | if (cfun) | |
5280 | { | |
30bcc028 | 5281 | need_pop = true; |
d2784db4 | 5282 | push_function_context (); |
00e8de68 GDR |
5283 | } |
5284 | else | |
30bcc028 | 5285 | need_pop = false; |
00e8de68 | 5286 | |
89b578be | 5287 | if (scope_chain && previous_class_level) |
f44b0c8e MM |
5288 | store_class_bindings (previous_class_level->class_shadowed, |
5289 | &s->old_bindings); | |
00e8de68 GDR |
5290 | |
5291 | /* Have to include the global scope, because class-scope decls | |
5292 | aren't listed anywhere useful. */ | |
5293 | for (; b; b = b->level_chain) | |
5294 | { | |
5295 | tree t; | |
5296 | ||
5297 | /* Template IDs are inserted into the global level. If they were | |
5298 | inserted into namespace level, finish_file wouldn't find them | |
5299 | when doing pending instantiations. Therefore, don't stop at | |
5300 | namespace level, but continue until :: . */ | |
c353b8e3 | 5301 | if (global_scope_p (b)) |
00e8de68 GDR |
5302 | break; |
5303 | ||
f44b0c8e | 5304 | store_bindings (b->names, &s->old_bindings); |
00e8de68 GDR |
5305 | /* We also need to check class_shadowed to save class-level type |
5306 | bindings, since pushclass doesn't fill in b->names. */ | |
5307 | if (b->kind == sk_class) | |
f44b0c8e | 5308 | store_class_bindings (b->class_shadowed, &s->old_bindings); |
00e8de68 GDR |
5309 | |
5310 | /* Unwind type-value slots back to top level. */ | |
5311 | for (t = b->type_shadowed; t; t = TREE_CHAIN (t)) | |
5312 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (t), TREE_VALUE (t)); | |
5313 | } | |
f44b0c8e | 5314 | |
9ba5ff0f | 5315 | for (i = 0; VEC_iterate (cxx_saved_binding, s->old_bindings, i, sb); ++i) |
f44b0c8e MM |
5316 | IDENTIFIER_MARKED (sb->identifier) = 0; |
5317 | ||
00e8de68 | 5318 | s->prev = scope_chain; |
00e8de68 GDR |
5319 | s->bindings = b; |
5320 | s->need_pop_function_context = need_pop; | |
5321 | s->function_decl = current_function_decl; | |
b794e321 | 5322 | s->skip_evaluation = skip_evaluation; |
00e8de68 GDR |
5323 | |
5324 | scope_chain = s; | |
5325 | current_function_decl = NULL_TREE; | |
aff44741 | 5326 | current_lang_base = VEC_alloc (tree, gc, 10); |
00e8de68 GDR |
5327 | current_lang_name = lang_name_cplusplus; |
5328 | current_namespace = global_namespace; | |
c888c93b | 5329 | push_class_stack (); |
b794e321 | 5330 | skip_evaluation = 0; |
00e8de68 GDR |
5331 | timevar_pop (TV_NAME_LOOKUP); |
5332 | } | |
5333 | ||
00e8de68 GDR |
5334 | void |
5335 | pop_from_top_level (void) | |
5336 | { | |
5337 | struct saved_scope *s = scope_chain; | |
5338 | cxx_saved_binding *saved; | |
f44b0c8e | 5339 | size_t i; |
00e8de68 | 5340 | |
c8094d83 | 5341 | timevar_push (TV_NAME_LOOKUP); |
00e8de68 | 5342 | /* Clear out class-level bindings cache. */ |
89b578be | 5343 | if (previous_class_level) |
00e8de68 | 5344 | invalidate_class_lookup_cache (); |
c888c93b | 5345 | pop_class_stack (); |
00e8de68 GDR |
5346 | |
5347 | current_lang_base = 0; | |
5348 | ||
5349 | scope_chain = s->prev; | |
9ba5ff0f | 5350 | for (i = 0; VEC_iterate (cxx_saved_binding, s->old_bindings, i, saved); ++i) |
00e8de68 GDR |
5351 | { |
5352 | tree id = saved->identifier; | |
5353 | ||
5354 | IDENTIFIER_BINDING (id) = saved->binding; | |
00e8de68 GDR |
5355 | SET_IDENTIFIER_TYPE_VALUE (id, saved->real_type_value); |
5356 | } | |
5357 | ||
5358 | /* If we were in the middle of compiling a function, restore our | |
5359 | state. */ | |
5360 | if (s->need_pop_function_context) | |
d2784db4 | 5361 | pop_function_context (); |
00e8de68 | 5362 | current_function_decl = s->function_decl; |
b794e321 | 5363 | skip_evaluation = s->skip_evaluation; |
00e8de68 GDR |
5364 | timevar_pop (TV_NAME_LOOKUP); |
5365 | } | |
5366 | ||
5367 | /* Pop off extraneous binding levels left over due to syntax errors. | |
5368 | ||
5369 | We don't pop past namespaces, as they might be valid. */ | |
5370 | ||
5371 | void | |
5372 | pop_everything (void) | |
5373 | { | |
5374 | if (ENABLE_SCOPE_CHECKING) | |
5375 | verbatim ("XXX entering pop_everything ()\n"); | |
5376 | while (!toplevel_bindings_p ()) | |
5377 | { | |
5378 | if (current_binding_level->kind == sk_class) | |
5379 | pop_nested_class (); | |
5380 | else | |
5381 | poplevel (0, 0, 0); | |
5382 | } | |
5383 | if (ENABLE_SCOPE_CHECKING) | |
5384 | verbatim ("XXX leaving pop_everything ()\n"); | |
5385 | } | |
5386 | ||
6097b0c3 | 5387 | /* Emit debugging information for using declarations and directives. |
c8094d83 | 5388 | If input tree is overloaded fn then emit debug info for all |
6097b0c3 DP |
5389 | candidates. */ |
5390 | ||
98ed9dae | 5391 | void |
6097b0c3 DP |
5392 | cp_emit_debug_info_for_using (tree t, tree context) |
5393 | { | |
099f36ab JM |
5394 | /* Don't try to emit any debug information if we have errors. */ |
5395 | if (sorrycount || errorcount) | |
5396 | return; | |
5397 | ||
c8094d83 | 5398 | /* Ignore this FUNCTION_DECL if it refers to a builtin declaration |
6097b0c3 | 5399 | of a builtin function. */ |
c8094d83 | 5400 | if (TREE_CODE (t) == FUNCTION_DECL |
6097b0c3 DP |
5401 | && DECL_EXTERNAL (t) |
5402 | && DECL_BUILT_IN (t)) | |
5403 | return; | |
5404 | ||
5405 | /* Do not supply context to imported_module_or_decl, if | |
5406 | it is a global namespace. */ | |
5407 | if (context == global_namespace) | |
5408 | context = NULL_TREE; | |
c8094d83 | 5409 | |
6097b0c3 DP |
5410 | if (BASELINK_P (t)) |
5411 | t = BASELINK_FUNCTIONS (t); | |
c8094d83 | 5412 | |
6097b0c3 DP |
5413 | /* FIXME: Handle TEMPLATE_DECLs. */ |
5414 | for (t = OVL_CURRENT (t); t; t = OVL_NEXT (t)) | |
5415 | if (TREE_CODE (t) != TEMPLATE_DECL) | |
98381eb4 JJ |
5416 | { |
5417 | if (building_stmt_tree ()) | |
c2255bc4 | 5418 | add_stmt (build_stmt (input_location, USING_STMT, t)); |
98381eb4 JJ |
5419 | else |
5420 | (*debug_hooks->imported_module_or_decl) (t, NULL_TREE, context, false); | |
5421 | } | |
98ed9dae | 5422 | } |
6097b0c3 | 5423 | |
28ea4c88 | 5424 | #include "gt-cp-name-lookup.h" |