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8d08fdba | 1 | /* Handle parameterized types (templates) for GNU C++. |
3febd123 | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
4514aa8c | 3 | 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
8d08fdba | 4 | Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing. |
fc378698 | 5 | Rewritten by Jason Merrill (jason@cygnus.com). |
8d08fdba | 6 | |
f5adbb8d | 7 | This file is part of GCC. |
8d08fdba | 8 | |
f5adbb8d | 9 | GCC is free software; you can redistribute it and/or modify |
8d08fdba MS |
10 | it under the terms of the GNU General Public License as published by |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
f5adbb8d | 14 | GCC is distributed in the hope that it will be useful, |
8d08fdba MS |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
f5adbb8d | 20 | along with GCC; see the file COPYING. If not, write to |
e9fa0c7c RK |
21 | the Free Software Foundation, 59 Temple Place - Suite 330, |
22 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
23 | |
24 | /* Known bugs or deficiencies include: | |
e92cc029 | 25 | |
e92cc029 MS |
26 | all methods must be provided in header files; can't use a source |
27 | file that contains only the method templates and "just win". */ | |
8d08fdba MS |
28 | |
29 | #include "config.h" | |
8d052bc7 | 30 | #include "system.h" |
4977bab6 ZW |
31 | #include "coretypes.h" |
32 | #include "tm.h" | |
8d08fdba | 33 | #include "obstack.h" |
8d08fdba | 34 | #include "tree.h" |
0c58f841 | 35 | #include "pointer-set.h" |
8d08fdba MS |
36 | #include "flags.h" |
37 | #include "cp-tree.h" | |
25af8512 | 38 | #include "tree-inline.h" |
8d08fdba | 39 | #include "decl.h" |
e8abc66f | 40 | #include "output.h" |
49c249e1 | 41 | #include "except.h" |
54f92bfb | 42 | #include "toplev.h" |
3dcaad8b | 43 | #include "rtl.h" |
297a5329 | 44 | #include "timevar.h" |
325c3691 | 45 | #include "tree-iterator.h" |
49c249e1 | 46 | |
050367a3 MM |
47 | /* The type of functions taking a tree, and some additional data, and |
48 | returning an int. */ | |
3a978d72 | 49 | typedef int (*tree_fn_t) (tree, void*); |
050367a3 | 50 | |
0aafb128 MM |
51 | /* The PENDING_TEMPLATES is a TREE_LIST of templates whose |
52 | instantiations have been deferred, either because their definitions | |
d78e771d ZW |
53 | were not yet available, or because we were putting off doing the work. |
54 | The TREE_PURPOSE of each entry is either a DECL (for a function or | |
55 | static data member), or a TYPE (for a class) indicating what we are | |
56 | hoping to instantiate. The TREE_VALUE is not used. */ | |
e2500fed | 57 | static GTY(()) tree pending_templates; |
13e73b29 | 58 | static GTY(()) tree last_pending_template; |
73aad9b9 | 59 | |
67ffc812 | 60 | int processing_template_parmlist; |
386b8a85 JM |
61 | static int template_header_count; |
62 | ||
e2500fed GK |
63 | static GTY(()) tree saved_trees; |
64 | static GTY(()) varray_type inline_parm_levels; | |
3dcaad8b | 65 | static size_t inline_parm_levels_used; |
75650646 | 66 | |
e2500fed | 67 | static GTY(()) tree current_tinst_level; |
3ae18eaf | 68 | |
2b59fc25 KL |
69 | static GTY(()) tree saved_access_scope; |
70 | ||
0fe0caa6 RH |
71 | /* Live only within one (recursive) call to tsubst_expr. We use |
72 | this to pass the statement expression node from the STMT_EXPR | |
73 | to the EXPR_STMT that is its result. */ | |
74 | static tree cur_stmt_expr; | |
75 | ||
6dfbb909 MM |
76 | /* A map from local variable declarations in the body of the template |
77 | presently being instantiated to the corresponding instantiated | |
78 | local variables. */ | |
79 | static htab_t local_specializations; | |
80 | ||
830bfa74 MM |
81 | #define UNIFY_ALLOW_NONE 0 |
82 | #define UNIFY_ALLOW_MORE_CV_QUAL 1 | |
83 | #define UNIFY_ALLOW_LESS_CV_QUAL 2 | |
84 | #define UNIFY_ALLOW_DERIVED 4 | |
161c12b0 | 85 | #define UNIFY_ALLOW_INTEGER 8 |
028d1f20 | 86 | #define UNIFY_ALLOW_OUTER_LEVEL 16 |
62e4a758 NS |
87 | #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32 |
88 | #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64 | |
d9f818d9 | 89 | #define UNIFY_ALLOW_MAX_CORRECTION 128 |
830bfa74 | 90 | |
3a978d72 NN |
91 | static void push_access_scope (tree); |
92 | static void pop_access_scope (tree); | |
93 | static int resolve_overloaded_unification (tree, tree, tree, tree, | |
94 | unification_kind_t, int); | |
95 | static int try_one_overload (tree, tree, tree, tree, tree, | |
f23fb7f5 | 96 | unification_kind_t, int, bool); |
3a978d72 NN |
97 | static int unify (tree, tree, tree, tree, int); |
98 | static void add_pending_template (tree); | |
99 | static void reopen_tinst_level (tree); | |
100 | static tree classtype_mangled_name (tree); | |
101 | static char* mangle_class_name_for_template (const char *, tree, tree); | |
102 | static tree tsubst_initializer_list (tree, tree); | |
3a978d72 NN |
103 | static tree get_class_bindings (tree, tree, tree); |
104 | static tree coerce_template_parms (tree, tree, tree, tsubst_flags_t, int); | |
105 | static void tsubst_enum (tree, tree, tree); | |
106 | static tree add_to_template_args (tree, tree); | |
107 | static tree add_outermost_template_args (tree, tree); | |
108 | static bool check_instantiated_args (tree, tree, tsubst_flags_t); | |
109 | static int maybe_adjust_types_for_deduction (unification_kind_t, tree*, tree*); | |
110 | static int type_unification_real (tree, tree, tree, tree, | |
111 | int, unification_kind_t, int, int); | |
112 | static void note_template_header (int); | |
b6ab6892 | 113 | static tree convert_nontype_argument_function (tree, tree); |
3a978d72 NN |
114 | static tree convert_nontype_argument (tree, tree); |
115 | static tree convert_template_argument (tree, tree, tree, | |
116 | tsubst_flags_t, int, tree); | |
117 | static tree get_bindings_overload (tree, tree, tree); | |
0c58f841 MA |
118 | static int for_each_template_parm (tree, tree_fn_t, void*, |
119 | struct pointer_set_t*); | |
3a978d72 NN |
120 | static tree build_template_parm_index (int, int, int, tree, tree); |
121 | static int inline_needs_template_parms (tree); | |
122 | static void push_inline_template_parms_recursive (tree, int); | |
3a978d72 | 123 | static tree retrieve_local_specialization (tree); |
3a978d72 | 124 | static void register_local_specialization (tree, tree); |
3a978d72 | 125 | static tree reduce_template_parm_level (tree, tree, int); |
3a978d72 NN |
126 | static int mark_template_parm (tree, void *); |
127 | static int template_parm_this_level_p (tree, void *); | |
128 | static tree tsubst_friend_function (tree, tree); | |
129 | static tree tsubst_friend_class (tree, tree); | |
130 | static int can_complete_type_without_circularity (tree); | |
10b1d5e7 | 131 | static tree get_bindings (tree, tree, tree); |
3a978d72 NN |
132 | static tree get_bindings_real (tree, tree, tree, int, int, int); |
133 | static int template_decl_level (tree); | |
134 | static int check_cv_quals_for_unify (int, tree, tree); | |
a91db711 NS |
135 | static tree tsubst_template_arg (tree, tree, tsubst_flags_t, tree); |
136 | static tree tsubst_template_args (tree, tree, tsubst_flags_t, tree); | |
3a978d72 NN |
137 | static tree tsubst_template_parms (tree, tree, tsubst_flags_t); |
138 | static void regenerate_decl_from_template (tree, tree); | |
139 | static tree most_specialized (tree, tree, tree); | |
140 | static tree most_specialized_class (tree, tree); | |
141 | static int template_class_depth_real (tree, int); | |
142 | static tree tsubst_aggr_type (tree, tree, tsubst_flags_t, tree, int); | |
3a978d72 NN |
143 | static tree tsubst_arg_types (tree, tree, tsubst_flags_t, tree); |
144 | static tree tsubst_function_type (tree, tree, tsubst_flags_t, tree); | |
145 | static void check_specialization_scope (void); | |
146 | static tree process_partial_specialization (tree); | |
147 | static void set_current_access_from_decl (tree); | |
148 | static void check_default_tmpl_args (tree, tree, int, int); | |
149 | static tree tsubst_call_declarator_parms (tree, tree, tsubst_flags_t, tree); | |
3a978d72 NN |
150 | static tree get_template_base (tree, tree, tree, tree); |
151 | static int verify_class_unification (tree, tree, tree); | |
152 | static tree try_class_unification (tree, tree, tree, tree); | |
153 | static int coerce_template_template_parms (tree, tree, tsubst_flags_t, | |
154 | tree, tree); | |
5fe7b654 | 155 | static tree determine_specialization (tree, tree, tree *, int, int); |
3a978d72 NN |
156 | static int template_args_equal (tree, tree); |
157 | static void tsubst_default_arguments (tree); | |
158 | static tree for_each_template_parm_r (tree *, int *, void *); | |
159 | static tree copy_default_args_to_explicit_spec_1 (tree, tree); | |
160 | static void copy_default_args_to_explicit_spec (tree); | |
161 | static int invalid_nontype_parm_type_p (tree, tsubst_flags_t); | |
a723baf1 | 162 | static int eq_local_specializations (const void *, const void *); |
5552b43c | 163 | static bool dependent_type_p_r (tree); |
14d22dd6 MM |
164 | static tree tsubst (tree, tree, tsubst_flags_t, tree); |
165 | static tree tsubst_expr (tree, tree, tsubst_flags_t, tree); | |
166 | static tree tsubst_copy (tree, tree, tsubst_flags_t, tree); | |
36a117a5 | 167 | |
2b59fc25 KL |
168 | /* Make the current scope suitable for access checking when we are |
169 | processing T. T can be FUNCTION_DECL for instantiated function | |
2b907f5c KL |
170 | template, or VAR_DECL for static member variable (need by |
171 | instantiate_decl). */ | |
2b59fc25 | 172 | |
8ce33230 | 173 | static void |
2b907f5c | 174 | push_access_scope (tree t) |
2b59fc25 | 175 | { |
50bc768d NS |
176 | gcc_assert (TREE_CODE (t) == FUNCTION_DECL |
177 | || TREE_CODE (t) == VAR_DECL); | |
2b59fc25 | 178 | |
23ff7e2d KL |
179 | if (DECL_FRIEND_CONTEXT (t)) |
180 | push_nested_class (DECL_FRIEND_CONTEXT (t)); | |
181 | else if (DECL_CLASS_SCOPE_P (t)) | |
2b907f5c | 182 | push_nested_class (DECL_CONTEXT (t)); |
0f399e5f KL |
183 | else |
184 | push_to_top_level (); | |
185 | ||
2b907f5c | 186 | if (TREE_CODE (t) == FUNCTION_DECL) |
0f399e5f KL |
187 | { |
188 | saved_access_scope = tree_cons | |
189 | (NULL_TREE, current_function_decl, saved_access_scope); | |
190 | current_function_decl = t; | |
191 | } | |
2b59fc25 KL |
192 | } |
193 | ||
2b59fc25 KL |
194 | /* Restore the scope set up by push_access_scope. T is the node we |
195 | are processing. */ | |
196 | ||
8ce33230 | 197 | static void |
3a978d72 | 198 | pop_access_scope (tree t) |
2b59fc25 | 199 | { |
2b907f5c | 200 | if (TREE_CODE (t) == FUNCTION_DECL) |
2b59fc25 KL |
201 | { |
202 | current_function_decl = TREE_VALUE (saved_access_scope); | |
203 | saved_access_scope = TREE_CHAIN (saved_access_scope); | |
204 | } | |
0f399e5f | 205 | |
23ff7e2d | 206 | if (DECL_FRIEND_CONTEXT (t) || DECL_CLASS_SCOPE_P (t)) |
0f399e5f KL |
207 | pop_nested_class (); |
208 | else | |
209 | pop_from_top_level (); | |
2b59fc25 KL |
210 | } |
211 | ||
a723baf1 MM |
212 | /* Do any processing required when DECL (a member template |
213 | declaration) is finished. Returns the TEMPLATE_DECL corresponding | |
214 | to DECL, unless it is a specialization, in which case the DECL | |
215 | itself is returned. */ | |
e1467ff2 MM |
216 | |
217 | tree | |
3a978d72 | 218 | finish_member_template_decl (tree decl) |
e1467ff2 | 219 | { |
a723baf1 MM |
220 | if (decl == error_mark_node) |
221 | return error_mark_node; | |
222 | ||
50bc768d | 223 | gcc_assert (DECL_P (decl)); |
a723baf1 MM |
224 | |
225 | if (TREE_CODE (decl) == TYPE_DECL) | |
93cdc044 | 226 | { |
a723baf1 MM |
227 | tree type; |
228 | ||
229 | type = TREE_TYPE (decl); | |
230 | if (IS_AGGR_TYPE (type) | |
231 | && CLASSTYPE_TEMPLATE_INFO (type) | |
232 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (type)) | |
93cdc044 | 233 | { |
a723baf1 | 234 | tree tmpl = CLASSTYPE_TI_TEMPLATE (type); |
93cdc044 JM |
235 | check_member_template (tmpl); |
236 | return tmpl; | |
237 | } | |
8d019cef | 238 | return NULL_TREE; |
93cdc044 | 239 | } |
07c88314 | 240 | else if (TREE_CODE (decl) == FIELD_DECL) |
0f51ccfc | 241 | error ("data member %qD cannot be a member template", decl); |
a1da6cba | 242 | else if (DECL_TEMPLATE_INFO (decl)) |
e1467ff2 | 243 | { |
a1da6cba MM |
244 | if (!DECL_TEMPLATE_SPECIALIZATION (decl)) |
245 | { | |
246 | check_member_template (DECL_TI_TEMPLATE (decl)); | |
247 | return DECL_TI_TEMPLATE (decl); | |
248 | } | |
249 | else | |
250 | return decl; | |
251 | } | |
252 | else | |
0f51ccfc | 253 | error ("invalid member template declaration %qD", decl); |
e1467ff2 | 254 | |
a1da6cba | 255 | return error_mark_node; |
f84b4be9 | 256 | } |
e1467ff2 | 257 | |
f84b4be9 JM |
258 | /* Returns the template nesting level of the indicated class TYPE. |
259 | ||
260 | For example, in: | |
261 | template <class T> | |
262 | struct A | |
263 | { | |
264 | template <class U> | |
265 | struct B {}; | |
266 | }; | |
267 | ||
39c01e4c MM |
268 | A<T>::B<U> has depth two, while A<T> has depth one. |
269 | Both A<T>::B<int> and A<int>::B<U> have depth one, if | |
270 | COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not | |
271 | specializations. | |
272 | ||
273 | This function is guaranteed to return 0 if passed NULL_TREE so | |
274 | that, for example, `template_class_depth (current_class_type)' is | |
275 | always safe. */ | |
f84b4be9 | 276 | |
e9659ab0 | 277 | static int |
3a978d72 | 278 | template_class_depth_real (tree type, int count_specializations) |
f84b4be9 | 279 | { |
93cdc044 | 280 | int depth; |
f84b4be9 | 281 | |
2c73f9f5 | 282 | for (depth = 0; |
ed44da02 MM |
283 | type && TREE_CODE (type) != NAMESPACE_DECL; |
284 | type = (TREE_CODE (type) == FUNCTION_DECL) | |
4f1c5b7d | 285 | ? CP_DECL_CONTEXT (type) : TYPE_CONTEXT (type)) |
ed44da02 MM |
286 | { |
287 | if (TREE_CODE (type) != FUNCTION_DECL) | |
288 | { | |
289 | if (CLASSTYPE_TEMPLATE_INFO (type) | |
290 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type)) | |
291 | && ((count_specializations | |
370af2d5 | 292 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (type)) |
ed44da02 MM |
293 | || uses_template_parms (CLASSTYPE_TI_ARGS (type)))) |
294 | ++depth; | |
295 | } | |
296 | else | |
297 | { | |
298 | if (DECL_TEMPLATE_INFO (type) | |
299 | && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type)) | |
300 | && ((count_specializations | |
301 | && DECL_TEMPLATE_SPECIALIZATION (type)) | |
302 | || uses_template_parms (DECL_TI_ARGS (type)))) | |
303 | ++depth; | |
304 | } | |
305 | } | |
f84b4be9 JM |
306 | |
307 | return depth; | |
e1467ff2 | 308 | } |
98c1c668 | 309 | |
39c01e4c MM |
310 | /* Returns the template nesting level of the indicated class TYPE. |
311 | Like template_class_depth_real, but instantiations do not count in | |
312 | the depth. */ | |
313 | ||
314 | int | |
3a978d72 | 315 | template_class_depth (tree type) |
39c01e4c MM |
316 | { |
317 | return template_class_depth_real (type, /*count_specializations=*/0); | |
318 | } | |
319 | ||
cae40af6 JM |
320 | /* Returns 1 if processing DECL as part of do_pending_inlines |
321 | needs us to push template parms. */ | |
322 | ||
323 | static int | |
3a978d72 | 324 | inline_needs_template_parms (tree decl) |
cae40af6 JM |
325 | { |
326 | if (! DECL_TEMPLATE_INFO (decl)) | |
327 | return 0; | |
f84b4be9 | 328 | |
36a117a5 | 329 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl))) |
cae40af6 JM |
330 | > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl))); |
331 | } | |
332 | ||
333 | /* Subroutine of maybe_begin_member_template_processing. | |
334 | Push the template parms in PARMS, starting from LEVELS steps into the | |
335 | chain, and ending at the beginning, since template parms are listed | |
336 | innermost first. */ | |
337 | ||
338 | static void | |
3a978d72 | 339 | push_inline_template_parms_recursive (tree parmlist, int levels) |
cae40af6 JM |
340 | { |
341 | tree parms = TREE_VALUE (parmlist); | |
342 | int i; | |
343 | ||
344 | if (levels > 1) | |
345 | push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1); | |
786b5245 | 346 | |
98c1c668 | 347 | ++processing_template_decl; |
cae40af6 | 348 | current_template_parms |
4890c2f4 | 349 | = tree_cons (size_int (processing_template_decl), |
98c1c668 | 350 | parms, current_template_parms); |
cae40af6 JM |
351 | TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1; |
352 | ||
ac20c67a GDR |
353 | begin_scope (TREE_VEC_LENGTH (parms) ? sk_template_parms : sk_template_spec, |
354 | NULL); | |
98c1c668 JM |
355 | for (i = 0; i < TREE_VEC_LENGTH (parms); ++i) |
356 | { | |
786b5245 | 357 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
50bc768d | 358 | gcc_assert (DECL_P (parm)); |
cae40af6 | 359 | |
98c1c668 JM |
360 | switch (TREE_CODE (parm)) |
361 | { | |
786b5245 | 362 | case TYPE_DECL: |
73b0fce8 | 363 | case TEMPLATE_DECL: |
98c1c668 JM |
364 | pushdecl (parm); |
365 | break; | |
786b5245 MM |
366 | |
367 | case PARM_DECL: | |
368 | { | |
fc03edb3 MM |
369 | /* Make a CONST_DECL as is done in process_template_parm. |
370 | It is ugly that we recreate this here; the original | |
371 | version built in process_template_parm is no longer | |
372 | available. */ | |
786b5245 MM |
373 | tree decl = build_decl (CONST_DECL, DECL_NAME (parm), |
374 | TREE_TYPE (parm)); | |
c727aa5e | 375 | DECL_ARTIFICIAL (decl) = 1; |
6de9cd9a DN |
376 | TREE_CONSTANT (decl) = 1; |
377 | TREE_INVARIANT (decl) = 1; | |
378 | TREE_READONLY (decl) = 1; | |
786b5245 | 379 | DECL_INITIAL (decl) = DECL_INITIAL (parm); |
cd9f6678 | 380 | SET_DECL_TEMPLATE_PARM_P (decl); |
786b5245 MM |
381 | pushdecl (decl); |
382 | } | |
cae40af6 | 383 | break; |
786b5245 | 384 | |
98c1c668 | 385 | default: |
315fb5db | 386 | gcc_unreachable (); |
98c1c668 JM |
387 | } |
388 | } | |
389 | } | |
390 | ||
cae40af6 JM |
391 | /* Restore the template parameter context for a member template or |
392 | a friend template defined in a class definition. */ | |
393 | ||
394 | void | |
3a978d72 | 395 | maybe_begin_member_template_processing (tree decl) |
cae40af6 JM |
396 | { |
397 | tree parms; | |
3dcaad8b | 398 | int levels = 0; |
cae40af6 | 399 | |
3dcaad8b MM |
400 | if (inline_needs_template_parms (decl)) |
401 | { | |
402 | parms = DECL_TEMPLATE_PARMS (most_general_template (decl)); | |
403 | levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl; | |
cae40af6 | 404 | |
3dcaad8b MM |
405 | if (DECL_TEMPLATE_SPECIALIZATION (decl)) |
406 | { | |
407 | --levels; | |
408 | parms = TREE_CHAIN (parms); | |
409 | } | |
cae40af6 | 410 | |
3dcaad8b | 411 | push_inline_template_parms_recursive (parms, levels); |
cae40af6 JM |
412 | } |
413 | ||
3dcaad8b MM |
414 | /* Remember how many levels of template parameters we pushed so that |
415 | we can pop them later. */ | |
416 | if (!inline_parm_levels) | |
417 | VARRAY_INT_INIT (inline_parm_levels, 4, "inline_parm_levels"); | |
418 | if (inline_parm_levels_used == inline_parm_levels->num_elements) | |
419 | VARRAY_GROW (inline_parm_levels, 2 * inline_parm_levels_used); | |
420 | VARRAY_INT (inline_parm_levels, inline_parm_levels_used) = levels; | |
421 | ++inline_parm_levels_used; | |
cae40af6 JM |
422 | } |
423 | ||
c6002625 | 424 | /* Undo the effects of begin_member_template_processing. */ |
98c1c668 JM |
425 | |
426 | void | |
3a978d72 | 427 | maybe_end_member_template_processing (void) |
98c1c668 | 428 | { |
3dcaad8b MM |
429 | int i; |
430 | ||
431 | if (!inline_parm_levels_used) | |
98c1c668 JM |
432 | return; |
433 | ||
3dcaad8b MM |
434 | --inline_parm_levels_used; |
435 | for (i = 0; | |
436 | i < VARRAY_INT (inline_parm_levels, inline_parm_levels_used); | |
437 | ++i) | |
cae40af6 JM |
438 | { |
439 | --processing_template_decl; | |
440 | current_template_parms = TREE_CHAIN (current_template_parms); | |
441 | poplevel (0, 0, 0); | |
442 | } | |
98c1c668 JM |
443 | } |
444 | ||
36a117a5 | 445 | /* Return a new template argument vector which contains all of ARGS, |
f9a7ae04 | 446 | but has as its innermost set of arguments the EXTRA_ARGS. */ |
e6f1275f JM |
447 | |
448 | static tree | |
3a978d72 | 449 | add_to_template_args (tree args, tree extra_args) |
e6f1275f | 450 | { |
36a117a5 MM |
451 | tree new_args; |
452 | int extra_depth; | |
453 | int i; | |
454 | int j; | |
e6f1275f | 455 | |
36a117a5 | 456 | extra_depth = TMPL_ARGS_DEPTH (extra_args); |
f31c0a32 | 457 | new_args = make_tree_vec (TMPL_ARGS_DEPTH (args) + extra_depth); |
e6f1275f | 458 | |
36a117a5 MM |
459 | for (i = 1; i <= TMPL_ARGS_DEPTH (args); ++i) |
460 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (args, i)); | |
e6f1275f | 461 | |
36a117a5 MM |
462 | for (j = 1; j <= extra_depth; ++j, ++i) |
463 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (extra_args, j)); | |
464 | ||
e6f1275f JM |
465 | return new_args; |
466 | } | |
467 | ||
36a117a5 MM |
468 | /* Like add_to_template_args, but only the outermost ARGS are added to |
469 | the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH | |
470 | (EXTRA_ARGS) levels are added. This function is used to combine | |
471 | the template arguments from a partial instantiation with the | |
472 | template arguments used to attain the full instantiation from the | |
473 | partial instantiation. */ | |
98c1c668 | 474 | |
4966381a | 475 | static tree |
3a978d72 | 476 | add_outermost_template_args (tree args, tree extra_args) |
98c1c668 JM |
477 | { |
478 | tree new_args; | |
479 | ||
e4a84209 MM |
480 | /* If there are more levels of EXTRA_ARGS than there are ARGS, |
481 | something very fishy is going on. */ | |
50bc768d | 482 | gcc_assert (TMPL_ARGS_DEPTH (args) >= TMPL_ARGS_DEPTH (extra_args)); |
e4a84209 MM |
483 | |
484 | /* If *all* the new arguments will be the EXTRA_ARGS, just return | |
485 | them. */ | |
486 | if (TMPL_ARGS_DEPTH (args) == TMPL_ARGS_DEPTH (extra_args)) | |
487 | return extra_args; | |
488 | ||
36a117a5 MM |
489 | /* For the moment, we make ARGS look like it contains fewer levels. */ |
490 | TREE_VEC_LENGTH (args) -= TMPL_ARGS_DEPTH (extra_args); | |
491 | ||
492 | new_args = add_to_template_args (args, extra_args); | |
98c1c668 | 493 | |
36a117a5 MM |
494 | /* Now, we restore ARGS to its full dimensions. */ |
495 | TREE_VEC_LENGTH (args) += TMPL_ARGS_DEPTH (extra_args); | |
98c1c668 JM |
496 | |
497 | return new_args; | |
498 | } | |
5566b478 | 499 | |
f9a7ae04 MM |
500 | /* Return the N levels of innermost template arguments from the ARGS. */ |
501 | ||
502 | tree | |
3a978d72 | 503 | get_innermost_template_args (tree args, int n) |
f9a7ae04 MM |
504 | { |
505 | tree new_args; | |
506 | int extra_levels; | |
507 | int i; | |
508 | ||
50bc768d | 509 | gcc_assert (n >= 0); |
f9a7ae04 MM |
510 | |
511 | /* If N is 1, just return the innermost set of template arguments. */ | |
512 | if (n == 1) | |
513 | return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args)); | |
514 | ||
515 | /* If we're not removing anything, just return the arguments we were | |
516 | given. */ | |
517 | extra_levels = TMPL_ARGS_DEPTH (args) - n; | |
50bc768d | 518 | gcc_assert (extra_levels >= 0); |
f9a7ae04 MM |
519 | if (extra_levels == 0) |
520 | return args; | |
521 | ||
522 | /* Make a new set of arguments, not containing the outer arguments. */ | |
523 | new_args = make_tree_vec (n); | |
524 | for (i = 1; i <= n; ++i) | |
525 | SET_TMPL_ARGS_LEVEL (new_args, i, | |
526 | TMPL_ARGS_LEVEL (args, i + extra_levels)); | |
527 | ||
528 | return new_args; | |
529 | } | |
530 | ||
5566b478 MS |
531 | /* We've got a template header coming up; push to a new level for storing |
532 | the parms. */ | |
8d08fdba | 533 | |
8d08fdba | 534 | void |
3a978d72 | 535 | begin_template_parm_list (void) |
8d08fdba | 536 | { |
6757edfe MM |
537 | /* We use a non-tag-transparent scope here, which causes pushtag to |
538 | put tags in this scope, rather than in the enclosing class or | |
539 | namespace scope. This is the right thing, since we want | |
540 | TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a | |
541 | global template class, push_template_decl handles putting the | |
542 | TEMPLATE_DECL into top-level scope. For a nested template class, | |
543 | e.g.: | |
544 | ||
545 | template <class T> struct S1 { | |
546 | template <class T> struct S2 {}; | |
547 | }; | |
548 | ||
549 | pushtag contains special code to call pushdecl_with_scope on the | |
550 | TEMPLATE_DECL for S2. */ | |
ac20c67a | 551 | begin_scope (sk_template_parms, NULL); |
5156628f | 552 | ++processing_template_decl; |
67ffc812 | 553 | ++processing_template_parmlist; |
386b8a85 JM |
554 | note_template_header (0); |
555 | } | |
556 | ||
6c30752f | 557 | /* This routine is called when a specialization is declared. If it is |
0e339752 | 558 | invalid to declare a specialization here, an error is reported. */ |
6c30752f | 559 | |
e9659ab0 | 560 | static void |
3a978d72 | 561 | check_specialization_scope (void) |
6c30752f MM |
562 | { |
563 | tree scope = current_scope (); | |
3ddfb0e6 | 564 | |
6c30752f MM |
565 | /* [temp.expl.spec] |
566 | ||
567 | An explicit specialization shall be declared in the namespace of | |
568 | which the template is a member, or, for member templates, in the | |
569 | namespace of which the enclosing class or enclosing class | |
570 | template is a member. An explicit specialization of a member | |
571 | function, member class or static data member of a class template | |
572 | shall be declared in the namespace of which the class template | |
573 | is a member. */ | |
574 | if (scope && TREE_CODE (scope) != NAMESPACE_DECL) | |
0f51ccfc | 575 | error ("explicit specialization in non-namespace scope %qD", scope); |
3ddfb0e6 | 576 | |
6c30752f MM |
577 | /* [temp.expl.spec] |
578 | ||
579 | In an explicit specialization declaration for a member of a class | |
580 | template or a member template that appears in namespace scope, | |
581 | the member template and some of its enclosing class templates may | |
582 | remain unspecialized, except that the declaration shall not | |
583 | explicitly specialize a class member template if its enclosing | |
584 | class templates are not explicitly specialized as well. */ | |
585 | if (current_template_parms) | |
33bd39a2 | 586 | error ("enclosing class templates are not explicitly specialized"); |
6c30752f MM |
587 | } |
588 | ||
c6002625 | 589 | /* We've just seen template <>. */ |
386b8a85 JM |
590 | |
591 | void | |
3a978d72 | 592 | begin_specialization (void) |
386b8a85 | 593 | { |
ac20c67a | 594 | begin_scope (sk_template_spec, NULL); |
386b8a85 | 595 | note_template_header (1); |
6c30752f | 596 | check_specialization_scope (); |
386b8a85 JM |
597 | } |
598 | ||
dc957d14 | 599 | /* Called at then end of processing a declaration preceded by |
386b8a85 JM |
600 | template<>. */ |
601 | ||
602 | void | |
3a978d72 | 603 | end_specialization (void) |
386b8a85 | 604 | { |
74b846e0 | 605 | finish_scope (); |
386b8a85 JM |
606 | reset_specialization (); |
607 | } | |
608 | ||
386b8a85 | 609 | /* Any template <>'s that we have seen thus far are not referring to a |
c6002625 | 610 | function specialization. */ |
386b8a85 JM |
611 | |
612 | void | |
3a978d72 | 613 | reset_specialization (void) |
386b8a85 JM |
614 | { |
615 | processing_specialization = 0; | |
616 | template_header_count = 0; | |
617 | } | |
618 | ||
838dfd8a | 619 | /* We've just seen a template header. If SPECIALIZATION is nonzero, |
386b8a85 JM |
620 | it was of the form template <>. */ |
621 | ||
4966381a | 622 | static void |
3a978d72 | 623 | note_template_header (int specialization) |
386b8a85 JM |
624 | { |
625 | processing_specialization = specialization; | |
626 | template_header_count++; | |
627 | } | |
628 | ||
75650646 | 629 | /* We're beginning an explicit instantiation. */ |
386b8a85 | 630 | |
75650646 | 631 | void |
3a978d72 | 632 | begin_explicit_instantiation (void) |
386b8a85 | 633 | { |
50bc768d | 634 | gcc_assert (!processing_explicit_instantiation); |
a723baf1 | 635 | processing_explicit_instantiation = true; |
75650646 | 636 | } |
386b8a85 | 637 | |
386b8a85 | 638 | |
75650646 | 639 | void |
3a978d72 | 640 | end_explicit_instantiation (void) |
75650646 | 641 | { |
50bc768d | 642 | gcc_assert (processing_explicit_instantiation); |
a723baf1 | 643 | processing_explicit_instantiation = false; |
75650646 | 644 | } |
386b8a85 | 645 | |
b1cc95ce MM |
646 | /* A explicit specialization or partial specialization TMPL is being |
647 | declared. Check that the namespace in which the specialization is | |
648 | occurring is permissible. Returns false iff it is invalid to | |
649 | specialize TMPL in the current namespace. */ | |
650 | ||
651 | static bool | |
652 | check_specialization_namespace (tree tmpl) | |
653 | { | |
654 | tree tpl_ns = decl_namespace_context (tmpl); | |
655 | ||
656 | /* [tmpl.expl.spec] | |
657 | ||
658 | An explicit specialization shall be declared in the namespace of | |
659 | which the template is a member, or, for member templates, in the | |
660 | namespace of which the enclosing class or enclosing class | |
661 | template is a member. An explicit specialization of a member | |
662 | function, member class or static data member of a class template | |
663 | shall be declared in the namespace of which the class template is | |
664 | a member. */ | |
665 | if (is_associated_namespace (current_namespace, tpl_ns)) | |
666 | /* Same or super-using namespace. */ | |
667 | return true; | |
668 | else | |
669 | { | |
0f51ccfc GDR |
670 | pedwarn ("specialization of %qD in different namespace", tmpl); |
671 | cp_pedwarn_at (" from definition of %q#D", tmpl); | |
b1cc95ce MM |
672 | return false; |
673 | } | |
674 | } | |
675 | ||
36a117a5 MM |
676 | /* The TYPE is being declared. If it is a template type, that means it |
677 | is a partial specialization. Do appropriate error-checking. */ | |
678 | ||
679 | void | |
3a978d72 | 680 | maybe_process_partial_specialization (tree type) |
36a117a5 | 681 | { |
6e049fcd KL |
682 | /* TYPE maybe an ERROR_MARK_NODE. */ |
683 | tree context = TYPE_P (type) ? TYPE_CONTEXT (type) : NULL_TREE; | |
684 | ||
a723baf1 | 685 | if (CLASS_TYPE_P (type) && CLASSTYPE_USE_TEMPLATE (type)) |
36a117a5 | 686 | { |
6e049fcd KL |
687 | /* This is for ordinary explicit specialization and partial |
688 | specialization of a template class such as: | |
689 | ||
690 | template <> class C<int>; | |
691 | ||
692 | or: | |
693 | ||
694 | template <class T> class C<T*>; | |
695 | ||
696 | Make sure that `C<int>' and `C<T*>' are implicit instantiations. */ | |
697 | ||
36a117a5 | 698 | if (CLASSTYPE_IMPLICIT_INSTANTIATION (type) |
d0f062fb | 699 | && !COMPLETE_TYPE_P (type)) |
36a117a5 | 700 | { |
b1cc95ce | 701 | check_specialization_namespace (CLASSTYPE_TI_TEMPLATE (type)); |
370af2d5 | 702 | SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type); |
36a117a5 MM |
703 | if (processing_template_decl) |
704 | push_template_decl (TYPE_MAIN_DECL (type)); | |
705 | } | |
706 | else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
0f51ccfc | 707 | error ("specialization of %qT after instantiation", type); |
36a117a5 | 708 | } |
6e049fcd KL |
709 | else if (CLASS_TYPE_P (type) |
710 | && !CLASSTYPE_USE_TEMPLATE (type) | |
711 | && CLASSTYPE_TEMPLATE_INFO (type) | |
712 | && context && CLASS_TYPE_P (context) | |
713 | && CLASSTYPE_TEMPLATE_INFO (context)) | |
714 | { | |
715 | /* This is for an explicit specialization of member class | |
716 | template according to [temp.expl.spec/18]: | |
717 | ||
718 | template <> template <class U> class C<int>::D; | |
719 | ||
720 | The context `C<int>' must be an implicit instantiation. | |
721 | Otherwise this is just a member class template declared | |
722 | earlier like: | |
723 | ||
724 | template <> class C<int> { template <class U> class D; }; | |
725 | template <> template <class U> class C<int>::D; | |
726 | ||
727 | In the first case, `C<int>::D' is a specialization of `C<T>::D' | |
728 | while in the second case, `C<int>::D' is a primary template | |
729 | and `C<T>::D' may not exist. */ | |
730 | ||
731 | if (CLASSTYPE_IMPLICIT_INSTANTIATION (context) | |
732 | && !COMPLETE_TYPE_P (type)) | |
733 | { | |
734 | tree t; | |
735 | ||
736 | if (current_namespace | |
737 | != decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type))) | |
738 | { | |
0f51ccfc GDR |
739 | pedwarn ("specializing %q#T in different namespace", type); |
740 | cp_pedwarn_at (" from definition of %q#D", | |
6e049fcd KL |
741 | CLASSTYPE_TI_TEMPLATE (type)); |
742 | } | |
743 | ||
744 | /* Check for invalid specialization after instantiation: | |
745 | ||
746 | template <> template <> class C<int>::D<int>; | |
747 | template <> template <class U> class C<int>::D; */ | |
748 | ||
749 | for (t = DECL_TEMPLATE_INSTANTIATIONS | |
750 | (most_general_template (CLASSTYPE_TI_TEMPLATE (type))); | |
751 | t; t = TREE_CHAIN (t)) | |
752 | if (TREE_VALUE (t) != type | |
753 | && TYPE_CONTEXT (TREE_VALUE (t)) == context) | |
0f51ccfc | 754 | error ("specialization %qT after instantiation %qT", |
6e049fcd KL |
755 | type, TREE_VALUE (t)); |
756 | ||
757 | /* Mark TYPE as a specialization. And as a result, we only | |
758 | have one level of template argument for the innermost | |
759 | class template. */ | |
760 | SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type); | |
761 | CLASSTYPE_TI_ARGS (type) | |
762 | = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type)); | |
763 | } | |
764 | } | |
20496fa2 | 765 | else if (processing_specialization) |
0f51ccfc | 766 | error ("explicit specialization of non-template %qT", type); |
36a117a5 MM |
767 | } |
768 | ||
ee81147e | 769 | /* Returns nonzero if we can optimize the retrieval of specializations |
c7222c02 MM |
770 | for TMPL, a TEMPLATE_DECL. In particular, for such a template, we |
771 | do not use DECL_TEMPLATE_SPECIALIZATIONS at all. */ | |
772 | ||
773 | static inline bool | |
774 | optimize_specialization_lookup_p (tree tmpl) | |
775 | { | |
776 | return (DECL_FUNCTION_TEMPLATE_P (tmpl) | |
777 | && DECL_CLASS_SCOPE_P (tmpl) | |
778 | /* DECL_CLASS_SCOPE_P holds of T::f even if T is a template | |
779 | parameter. */ | |
780 | && CLASS_TYPE_P (DECL_CONTEXT (tmpl)) | |
1ca939e5 MM |
781 | /* The optimized lookup depends on the fact that the |
782 | template arguments for the member function template apply | |
783 | purely to the containing class, which is not true if the | |
784 | containing class is an explicit or partial | |
785 | specialization. */ | |
786 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (tmpl)) | |
c7222c02 MM |
787 | && !DECL_MEMBER_TEMPLATE_P (tmpl) |
788 | && !DECL_CONV_FN_P (tmpl) | |
789 | /* It is possible to have a template that is not a member | |
790 | template and is not a member of a template class: | |
791 | ||
792 | template <typename T> | |
793 | struct S { friend A::f(); }; | |
794 | ||
795 | Here, the friend function is a template, but the context does | |
796 | not have template information. The optimized lookup relies | |
797 | on having ARGS be the template arguments for both the class | |
798 | and the function template. */ | |
799 | && !DECL_FRIEND_P (DECL_TEMPLATE_RESULT (tmpl))); | |
800 | } | |
801 | ||
75650646 MM |
802 | /* Retrieve the specialization (in the sense of [temp.spec] - a |
803 | specialization is either an instantiation or an explicit | |
804 | specialization) of TMPL for the given template ARGS. If there is | |
805 | no such specialization, return NULL_TREE. The ARGS are a vector of | |
806 | arguments, or a vector of vectors of arguments, in the case of | |
c7222c02 MM |
807 | templates with more than one level of parameters. |
808 | ||
809 | If TMPL is a type template and CLASS_SPECIALIZATIONS_P is true, | |
810 | then we search for a partial specialization matching ARGS. This | |
811 | parameter is ignored if TMPL is not a class template. */ | |
75650646 MM |
812 | |
813 | static tree | |
c7222c02 MM |
814 | retrieve_specialization (tree tmpl, tree args, |
815 | bool class_specializations_p) | |
75650646 | 816 | { |
50bc768d | 817 | gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL); |
75650646 | 818 | |
36a117a5 MM |
819 | /* There should be as many levels of arguments as there are |
820 | levels of parameters. */ | |
50bc768d NS |
821 | gcc_assert (TMPL_ARGS_DEPTH (args) |
822 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl))); | |
c7222c02 MM |
823 | |
824 | if (optimize_specialization_lookup_p (tmpl)) | |
825 | { | |
826 | tree class_template; | |
827 | tree class_specialization; | |
828 | VEC(tree) *methods; | |
829 | tree fns; | |
830 | int idx; | |
831 | ||
832 | /* The template arguments actually apply to the containing | |
833 | class. Find the class specialization with those | |
834 | arguments. */ | |
835 | class_template = CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (tmpl)); | |
836 | class_specialization | |
837 | = retrieve_specialization (class_template, args, | |
838 | /*class_specializations_p=*/false); | |
839 | if (!class_specialization) | |
840 | return NULL_TREE; | |
841 | /* Now, find the appropriate entry in the CLASSTYPE_METHOD_VEC | |
842 | for the specialization. */ | |
843 | idx = class_method_index_for_fn (class_specialization, tmpl); | |
844 | if (idx == -1) | |
845 | return NULL_TREE; | |
846 | /* Iterate through the methods with the indicated name, looking | |
847 | for the one that has an instance of TMPL. */ | |
848 | methods = CLASSTYPE_METHOD_VEC (class_specialization); | |
849 | for (fns = VEC_index (tree, methods, idx); fns; fns = OVL_NEXT (fns)) | |
850 | { | |
851 | tree fn = OVL_CURRENT (fns); | |
852 | if (DECL_TEMPLATE_INFO (fn) && DECL_TI_TEMPLATE (fn) == tmpl) | |
853 | return fn; | |
854 | } | |
855 | return NULL_TREE; | |
856 | } | |
857 | else | |
858 | { | |
859 | tree *sp; | |
860 | tree *head; | |
861 | ||
862 | /* Class templates store their instantiations on the | |
863 | DECL_TEMPLATE_INSTANTIATIONS list; other templates use the | |
864 | DECL_TEMPLATE_SPECIALIZATIONS list. */ | |
865 | if (!class_specializations_p | |
866 | && TREE_CODE (DECL_TEMPLATE_RESULT (tmpl)) == TYPE_DECL) | |
867 | sp = &DECL_TEMPLATE_INSTANTIATIONS (tmpl); | |
868 | else | |
869 | sp = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl); | |
870 | head = sp; | |
871 | /* Iterate through the list until we find a matching template. */ | |
872 | while (*sp != NULL_TREE) | |
873 | { | |
874 | tree spec = *sp; | |
875 | ||
876 | if (comp_template_args (TREE_PURPOSE (spec), args)) | |
877 | { | |
878 | /* Use the move-to-front heuristic to speed up future | |
879 | searches. */ | |
880 | if (spec != *head) | |
881 | { | |
882 | *sp = TREE_CHAIN (*sp); | |
883 | TREE_CHAIN (spec) = *head; | |
884 | *head = spec; | |
885 | } | |
886 | return TREE_VALUE (spec); | |
887 | } | |
888 | sp = &TREE_CHAIN (spec); | |
889 | } | |
890 | } | |
75650646 MM |
891 | |
892 | return NULL_TREE; | |
386b8a85 JM |
893 | } |
894 | ||
dc957d14 | 895 | /* Like retrieve_specialization, but for local declarations. */ |
9188c363 MM |
896 | |
897 | static tree | |
3a978d72 | 898 | retrieve_local_specialization (tree tmpl) |
9188c363 | 899 | { |
c68b0a84 KG |
900 | tree spec = htab_find_with_hash (local_specializations, tmpl, |
901 | htab_hash_pointer (tmpl)); | |
a723baf1 | 902 | return spec ? TREE_PURPOSE (spec) : NULL_TREE; |
9188c363 MM |
903 | } |
904 | ||
838dfd8a | 905 | /* Returns nonzero iff DECL is a specialization of TMPL. */ |
6757edfe MM |
906 | |
907 | int | |
3a978d72 | 908 | is_specialization_of (tree decl, tree tmpl) |
6757edfe MM |
909 | { |
910 | tree t; | |
911 | ||
912 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
913 | { | |
914 | for (t = decl; | |
915 | t != NULL_TREE; | |
916 | t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE) | |
917 | if (t == tmpl) | |
918 | return 1; | |
919 | } | |
920 | else | |
921 | { | |
50bc768d | 922 | gcc_assert (TREE_CODE (decl) == TYPE_DECL); |
6757edfe MM |
923 | |
924 | for (t = TREE_TYPE (decl); | |
925 | t != NULL_TREE; | |
926 | t = CLASSTYPE_USE_TEMPLATE (t) | |
927 | ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE) | |
9edc3913 | 928 | if (same_type_ignoring_top_level_qualifiers_p (t, TREE_TYPE (tmpl))) |
6757edfe MM |
929 | return 1; |
930 | } | |
386b8a85 | 931 | |
6757edfe MM |
932 | return 0; |
933 | } | |
75650646 | 934 | |
d43f603d KL |
935 | /* Returns nonzero iff DECL is a specialization of friend declaration |
936 | FRIEND according to [temp.friend]. */ | |
937 | ||
938 | bool | |
939 | is_specialization_of_friend (tree decl, tree friend) | |
940 | { | |
941 | bool need_template = true; | |
942 | int template_depth; | |
943 | ||
b939a023 KL |
944 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL |
945 | || TREE_CODE (decl) == TYPE_DECL); | |
d43f603d KL |
946 | |
947 | /* For [temp.friend/6] when FRIEND is an ordinary member function | |
948 | of a template class, we want to check if DECL is a specialization | |
949 | if this. */ | |
950 | if (TREE_CODE (friend) == FUNCTION_DECL | |
951 | && DECL_TEMPLATE_INFO (friend) | |
952 | && !DECL_USE_TEMPLATE (friend)) | |
953 | { | |
b939a023 | 954 | /* We want a TEMPLATE_DECL for `is_specialization_of'. */ |
d43f603d KL |
955 | friend = DECL_TI_TEMPLATE (friend); |
956 | need_template = false; | |
957 | } | |
b939a023 KL |
958 | else if (TREE_CODE (friend) == TEMPLATE_DECL |
959 | && !PRIMARY_TEMPLATE_P (friend)) | |
960 | need_template = false; | |
d43f603d KL |
961 | |
962 | /* There is nothing to do if this is not a template friend. */ | |
963 | if (TREE_CODE (friend) != TEMPLATE_DECL) | |
b939a023 | 964 | return false; |
d43f603d KL |
965 | |
966 | if (is_specialization_of (decl, friend)) | |
b939a023 | 967 | return true; |
d43f603d KL |
968 | |
969 | /* [temp.friend/6] | |
970 | A member of a class template may be declared to be a friend of a | |
971 | non-template class. In this case, the corresponding member of | |
972 | every specialization of the class template is a friend of the | |
973 | class granting friendship. | |
974 | ||
975 | For example, given a template friend declaration | |
976 | ||
977 | template <class T> friend void A<T>::f(); | |
978 | ||
979 | the member function below is considered a friend | |
980 | ||
981 | template <> struct A<int> { | |
982 | void f(); | |
983 | }; | |
984 | ||
985 | For this type of template friend, TEMPLATE_DEPTH below will be | |
5c425df5 | 986 | nonzero. To determine if DECL is a friend of FRIEND, we first |
d43f603d KL |
987 | check if the enclosing class is a specialization of another. */ |
988 | ||
989 | template_depth = template_class_depth (DECL_CONTEXT (friend)); | |
990 | if (template_depth | |
991 | && DECL_CLASS_SCOPE_P (decl) | |
992 | && is_specialization_of (TYPE_NAME (DECL_CONTEXT (decl)), | |
993 | CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (friend)))) | |
994 | { | |
995 | /* Next, we check the members themselves. In order to handle | |
b939a023 | 996 | a few tricky cases, such as when FRIEND's are |
d43f603d KL |
997 | |
998 | template <class T> friend void A<T>::g(T t); | |
999 | template <class T> template <T t> friend void A<T>::h(); | |
1000 | ||
b939a023 KL |
1001 | and DECL's are |
1002 | ||
1003 | void A<int>::g(int); | |
1004 | template <int> void A<int>::h(); | |
1005 | ||
1006 | we need to figure out ARGS, the template arguments from | |
1007 | the context of DECL. This is required for template substitution | |
1008 | of `T' in the function parameter of `g' and template parameter | |
1009 | of `h' in the above examples. Here ARGS corresponds to `int'. */ | |
d43f603d KL |
1010 | |
1011 | tree context = DECL_CONTEXT (decl); | |
1012 | tree args = NULL_TREE; | |
1013 | int current_depth = 0; | |
b939a023 | 1014 | |
d43f603d KL |
1015 | while (current_depth < template_depth) |
1016 | { | |
1017 | if (CLASSTYPE_TEMPLATE_INFO (context)) | |
1018 | { | |
1019 | if (current_depth == 0) | |
1020 | args = TYPE_TI_ARGS (context); | |
1021 | else | |
1022 | args = add_to_template_args (TYPE_TI_ARGS (context), args); | |
1023 | current_depth++; | |
1024 | } | |
1025 | context = TYPE_CONTEXT (context); | |
1026 | } | |
1027 | ||
1028 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
1029 | { | |
1030 | bool is_template; | |
1031 | tree friend_type; | |
1032 | tree decl_type; | |
1033 | tree friend_args_type; | |
1034 | tree decl_args_type; | |
1035 | ||
1036 | /* Make sure that both DECL and FRIEND are templates or | |
1037 | non-templates. */ | |
1038 | is_template = DECL_TEMPLATE_INFO (decl) | |
1039 | && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl)); | |
1040 | if (need_template ^ is_template) | |
b939a023 | 1041 | return false; |
d43f603d KL |
1042 | else if (is_template) |
1043 | { | |
da1d7781 | 1044 | /* If both are templates, check template parameter list. */ |
d43f603d KL |
1045 | tree friend_parms |
1046 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend), | |
1047 | args, tf_none); | |
1048 | if (!comp_template_parms | |
1049 | (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (decl)), | |
1050 | friend_parms)) | |
b939a023 | 1051 | return false; |
d43f603d KL |
1052 | |
1053 | decl_type = TREE_TYPE (DECL_TI_TEMPLATE (decl)); | |
1054 | } | |
1055 | else | |
1056 | decl_type = TREE_TYPE (decl); | |
1057 | ||
1058 | friend_type = tsubst_function_type (TREE_TYPE (friend), args, | |
1059 | tf_none, NULL_TREE); | |
1060 | if (friend_type == error_mark_node) | |
b939a023 | 1061 | return false; |
d43f603d KL |
1062 | |
1063 | /* Check if return types match. */ | |
1064 | if (!same_type_p (TREE_TYPE (decl_type), TREE_TYPE (friend_type))) | |
b939a023 | 1065 | return false; |
d43f603d KL |
1066 | |
1067 | /* Check if function parameter types match, ignoring the | |
1068 | `this' parameter. */ | |
1069 | friend_args_type = TYPE_ARG_TYPES (friend_type); | |
1070 | decl_args_type = TYPE_ARG_TYPES (decl_type); | |
1071 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (friend)) | |
1072 | friend_args_type = TREE_CHAIN (friend_args_type); | |
1073 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1074 | decl_args_type = TREE_CHAIN (decl_args_type); | |
b939a023 KL |
1075 | |
1076 | return compparms (decl_args_type, friend_args_type); | |
1077 | } | |
1078 | else | |
1079 | { | |
1080 | /* DECL is a TYPE_DECL */ | |
1081 | bool is_template; | |
1082 | tree decl_type = TREE_TYPE (decl); | |
1083 | ||
1084 | /* Make sure that both DECL and FRIEND are templates or | |
1085 | non-templates. */ | |
1086 | is_template | |
1087 | = CLASSTYPE_TEMPLATE_INFO (decl_type) | |
1088 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (decl_type)); | |
1089 | ||
1090 | if (need_template ^ is_template) | |
1091 | return false; | |
1092 | else if (is_template) | |
1093 | { | |
1094 | tree friend_parms; | |
1095 | /* If both are templates, check the name of the two | |
1096 | TEMPLATE_DECL's first because is_friend didn't. */ | |
1097 | if (DECL_NAME (CLASSTYPE_TI_TEMPLATE (decl_type)) | |
1098 | != DECL_NAME (friend)) | |
1099 | return false; | |
1100 | ||
1101 | /* Now check template parameter list. */ | |
1102 | friend_parms | |
1103 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend), | |
1104 | args, tf_none); | |
1105 | return comp_template_parms | |
1106 | (DECL_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (decl_type)), | |
1107 | friend_parms); | |
1108 | } | |
1109 | else | |
1110 | return (DECL_NAME (decl) | |
1111 | == DECL_NAME (friend)); | |
d43f603d KL |
1112 | } |
1113 | } | |
b939a023 | 1114 | return false; |
d43f603d KL |
1115 | } |
1116 | ||
75650646 | 1117 | /* Register the specialization SPEC as a specialization of TMPL with |
36a117a5 MM |
1118 | the indicated ARGS. Returns SPEC, or an equivalent prior |
1119 | declaration, if available. */ | |
75650646 | 1120 | |
36a117a5 | 1121 | static tree |
3a978d72 | 1122 | register_specialization (tree spec, tree tmpl, tree args) |
75650646 | 1123 | { |
c7222c02 | 1124 | tree fn; |
75650646 | 1125 | |
50bc768d | 1126 | gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL); |
75650646 | 1127 | |
36a117a5 MM |
1128 | if (TREE_CODE (spec) == FUNCTION_DECL |
1129 | && uses_template_parms (DECL_TI_ARGS (spec))) | |
1130 | /* This is the FUNCTION_DECL for a partial instantiation. Don't | |
1131 | register it; we want the corresponding TEMPLATE_DECL instead. | |
1132 | We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than | |
1133 | the more obvious `uses_template_parms (spec)' to avoid problems | |
1134 | with default function arguments. In particular, given | |
1135 | something like this: | |
1136 | ||
1137 | template <class T> void f(T t1, T t = T()) | |
1138 | ||
1139 | the default argument expression is not substituted for in an | |
1140 | instantiation unless and until it is actually needed. */ | |
1141 | return spec; | |
28ba38e3 | 1142 | |
36a117a5 MM |
1143 | /* There should be as many levels of arguments as there are |
1144 | levels of parameters. */ | |
50bc768d NS |
1145 | gcc_assert (TMPL_ARGS_DEPTH (args) |
1146 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl))); | |
36a117a5 | 1147 | |
c7222c02 MM |
1148 | fn = retrieve_specialization (tmpl, args, |
1149 | /*class_specializations_p=*/false); | |
1150 | /* We can sometimes try to re-register a specialization that we've | |
1151 | already got. In particular, regenerate_decl_from_template calls | |
1152 | duplicate_decls which will update the specialization list. But, | |
1153 | we'll still get called again here anyhow. It's more convenient | |
1154 | to simply allow this than to try to prevent it. */ | |
1155 | if (fn == spec) | |
1156 | return spec; | |
1157 | else if (fn && DECL_TEMPLATE_SPECIALIZATION (spec)) | |
22e9174f | 1158 | { |
c7222c02 | 1159 | if (DECL_TEMPLATE_INSTANTIATION (fn)) |
22e9174f | 1160 | { |
c7222c02 MM |
1161 | if (TREE_USED (fn) |
1162 | || DECL_EXPLICIT_INSTANTIATION (fn)) | |
22e9174f | 1163 | { |
c7222c02 MM |
1164 | error ("specialization of %qD after instantiation", |
1165 | fn); | |
1166 | return spec; | |
22e9174f | 1167 | } |
c7222c02 | 1168 | else |
b1cc95ce | 1169 | { |
c7222c02 MM |
1170 | /* This situation should occur only if the first |
1171 | specialization is an implicit instantiation, the | |
1172 | second is an explicit specialization, and the | |
1173 | implicit instantiation has not yet been used. That | |
1174 | situation can occur if we have implicitly | |
1175 | instantiated a member function and then specialized | |
1176 | it later. | |
1177 | ||
1178 | We can also wind up here if a friend declaration that | |
1179 | looked like an instantiation turns out to be a | |
1180 | specialization: | |
1181 | ||
1182 | template <class T> void foo(T); | |
1183 | class S { friend void foo<>(int) }; | |
1184 | template <> void foo(int); | |
1185 | ||
1186 | We transform the existing DECL in place so that any | |
1187 | pointers to it become pointers to the updated | |
1188 | declaration. | |
1189 | ||
1190 | If there was a definition for the template, but not | |
1191 | for the specialization, we want this to look as if | |
1192 | there were no definition, and vice versa. */ | |
1193 | DECL_INITIAL (fn) = NULL_TREE; | |
1194 | duplicate_decls (spec, fn); | |
b1cc95ce MM |
1195 | |
1196 | return fn; | |
1197 | } | |
22e9174f | 1198 | } |
c7222c02 MM |
1199 | else if (DECL_TEMPLATE_SPECIALIZATION (fn)) |
1200 | { | |
1201 | if (!duplicate_decls (spec, fn) && DECL_INITIAL (spec)) | |
1202 | /* Dup decl failed, but this is a new definition. Set the | |
1203 | line number so any errors match this new | |
1204 | definition. */ | |
1205 | DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (spec); | |
1206 | ||
1207 | return fn; | |
1208 | } | |
b1cc95ce MM |
1209 | } |
1210 | ||
1211 | /* A specialization must be declared in the same namespace as the | |
1212 | template it is specializing. */ | |
1213 | if (DECL_TEMPLATE_SPECIALIZATION (spec) | |
1214 | && !check_specialization_namespace (tmpl)) | |
1215 | DECL_CONTEXT (spec) = decl_namespace_context (tmpl); | |
75650646 | 1216 | |
c7222c02 MM |
1217 | if (!optimize_specialization_lookup_p (tmpl)) |
1218 | DECL_TEMPLATE_SPECIALIZATIONS (tmpl) | |
1219 | = tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl)); | |
36a117a5 MM |
1220 | |
1221 | return spec; | |
1222 | } | |
1223 | ||
1224 | /* Unregister the specialization SPEC as a specialization of TMPL. | |
b3445994 MM |
1225 | Replace it with NEW_SPEC, if NEW_SPEC is non-NULL. Returns true |
1226 | if the SPEC was listed as a specialization of TMPL. */ | |
36a117a5 | 1227 | |
b3445994 MM |
1228 | bool |
1229 | reregister_specialization (tree spec, tree tmpl, tree new_spec) | |
36a117a5 MM |
1230 | { |
1231 | tree* s; | |
1232 | ||
1233 | for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl); | |
1234 | *s != NULL_TREE; | |
1235 | s = &TREE_CHAIN (*s)) | |
1236 | if (TREE_VALUE (*s) == spec) | |
1237 | { | |
b3445994 MM |
1238 | if (!new_spec) |
1239 | *s = TREE_CHAIN (*s); | |
1240 | else | |
a3d87771 | 1241 | TREE_VALUE (*s) = new_spec; |
36a117a5 MM |
1242 | return 1; |
1243 | } | |
1244 | ||
1245 | return 0; | |
75650646 MM |
1246 | } |
1247 | ||
a723baf1 MM |
1248 | /* Compare an entry in the local specializations hash table P1 (which |
1249 | is really a pointer to a TREE_LIST) with P2 (which is really a | |
1250 | DECL). */ | |
1251 | ||
1252 | static int | |
1253 | eq_local_specializations (const void *p1, const void *p2) | |
1254 | { | |
1255 | return TREE_VALUE ((tree) p1) == (tree) p2; | |
1256 | } | |
1257 | ||
69f794a7 MM |
1258 | /* Hash P1, an entry in the local specializations table. */ |
1259 | ||
1260 | static hashval_t | |
1261 | hash_local_specialization (const void* p1) | |
1262 | { | |
1263 | return htab_hash_pointer (TREE_VALUE ((tree) p1)); | |
1264 | } | |
1265 | ||
6dfbb909 MM |
1266 | /* Like register_specialization, but for local declarations. We are |
1267 | registering SPEC, an instantiation of TMPL. */ | |
9188c363 | 1268 | |
414ea4aa | 1269 | static void |
3a978d72 | 1270 | register_local_specialization (tree spec, tree tmpl) |
9188c363 | 1271 | { |
6dfbb909 MM |
1272 | void **slot; |
1273 | ||
69f794a7 MM |
1274 | slot = htab_find_slot_with_hash (local_specializations, tmpl, |
1275 | htab_hash_pointer (tmpl), INSERT); | |
a723baf1 | 1276 | *slot = build_tree_list (spec, tmpl); |
9188c363 MM |
1277 | } |
1278 | ||
e1467ff2 MM |
1279 | /* Print the list of candidate FNS in an error message. */ |
1280 | ||
104bf76a | 1281 | void |
3a978d72 | 1282 | print_candidates (tree fns) |
e1467ff2 MM |
1283 | { |
1284 | tree fn; | |
1285 | ||
d8e178a0 | 1286 | const char *str = "candidates are:"; |
e1467ff2 MM |
1287 | |
1288 | for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn)) | |
1289 | { | |
d6479fe7 MM |
1290 | tree f; |
1291 | ||
1292 | for (f = TREE_VALUE (fn); f; f = OVL_NEXT (f)) | |
1293 | cp_error_at ("%s %+#D", str, OVL_CURRENT (f)); | |
e1467ff2 MM |
1294 | str = " "; |
1295 | } | |
1296 | } | |
1297 | ||
75650646 | 1298 | /* Returns the template (one of the functions given by TEMPLATE_ID) |
e1467ff2 | 1299 | which can be specialized to match the indicated DECL with the |
03017874 MM |
1300 | explicit template args given in TEMPLATE_ID. The DECL may be |
1301 | NULL_TREE if none is available. In that case, the functions in | |
1302 | TEMPLATE_ID are non-members. | |
1303 | ||
838dfd8a | 1304 | If NEED_MEMBER_TEMPLATE is nonzero the function is known to be a |
03017874 MM |
1305 | specialization of a member template. |
1306 | ||
5fe7b654 GB |
1307 | The TEMPLATE_COUNT is the number of references to qualifying |
1308 | template classes that appeared in the name of the function. See | |
1309 | check_explicit_specialization for a more accurate description. | |
1310 | ||
03017874 MM |
1311 | The template args (those explicitly specified and those deduced) |
1312 | are output in a newly created vector *TARGS_OUT. | |
1313 | ||
1314 | If it is impossible to determine the result, an error message is | |
bf8f3f93 | 1315 | issued. The error_mark_node is returned to indicate failure. */ |
75650646 | 1316 | |
e9659ab0 | 1317 | static tree |
3a978d72 NN |
1318 | determine_specialization (tree template_id, |
1319 | tree decl, | |
1320 | tree* targs_out, | |
5fe7b654 GB |
1321 | int need_member_template, |
1322 | int template_count) | |
386b8a85 | 1323 | { |
03017874 MM |
1324 | tree fns; |
1325 | tree targs; | |
1326 | tree explicit_targs; | |
1327 | tree candidates = NULL_TREE; | |
1328 | tree templates = NULL_TREE; | |
5fe7b654 GB |
1329 | int header_count; |
1330 | struct cp_binding_level *b; | |
386b8a85 | 1331 | |
e1467ff2 MM |
1332 | *targs_out = NULL_TREE; |
1333 | ||
f2e48b67 BK |
1334 | if (template_id == error_mark_node) |
1335 | return error_mark_node; | |
1336 | ||
1337 | fns = TREE_OPERAND (template_id, 0); | |
03017874 | 1338 | explicit_targs = TREE_OPERAND (template_id, 1); |
f2e48b67 | 1339 | |
27fafc8d JM |
1340 | if (fns == error_mark_node) |
1341 | return error_mark_node; | |
1342 | ||
c6002625 | 1343 | /* Check for baselinks. */ |
91e490ab | 1344 | if (BASELINK_P (fns)) |
da15dae6 | 1345 | fns = BASELINK_FUNCTIONS (fns); |
386b8a85 | 1346 | |
91e490ab MM |
1347 | if (!is_overloaded_fn (fns)) |
1348 | { | |
0f51ccfc | 1349 | error ("%qD is not a function template", fns); |
91e490ab MM |
1350 | return error_mark_node; |
1351 | } | |
1352 | ||
5fe7b654 GB |
1353 | /* Count the number of template headers specified for this |
1354 | specialization. */ | |
1355 | header_count = 0; | |
1356 | for (b = current_binding_level; | |
1357 | b->kind == sk_template_parms || b->kind == sk_template_spec; | |
1358 | b = b->level_chain) | |
1359 | ++header_count; | |
1360 | ||
2c73f9f5 | 1361 | for (; fns; fns = OVL_NEXT (fns)) |
386b8a85 | 1362 | { |
9dfce8fd | 1363 | tree fn = OVL_CURRENT (fns); |
03017874 MM |
1364 | |
1365 | if (TREE_CODE (fn) == TEMPLATE_DECL) | |
d955f6ea KL |
1366 | { |
1367 | tree decl_arg_types; | |
0da99d4e | 1368 | tree fn_arg_types; |
d955f6ea KL |
1369 | |
1370 | /* DECL might be a specialization of FN. */ | |
1371 | ||
1372 | /* Adjust the type of DECL in case FN is a static member. */ | |
1373 | decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1374 | if (DECL_STATIC_FUNCTION_P (fn) | |
1375 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1376 | decl_arg_types = TREE_CHAIN (decl_arg_types); | |
1377 | ||
1378 | /* Check that the number of function parameters matches. | |
1379 | For example, | |
1380 | template <class T> void f(int i = 0); | |
1381 | template <> void f<int>(); | |
0e339752 | 1382 | The specialization f<int> is invalid but is not caught |
d955f6ea KL |
1383 | by get_bindings below. */ |
1384 | ||
0da99d4e GB |
1385 | fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn)); |
1386 | if (list_length (fn_arg_types) != list_length (decl_arg_types)) | |
1387 | continue; | |
1388 | ||
1389 | /* For a non-static member function, we need to make sure that | |
1390 | the const qualification is the same. This can be done by | |
1391 | checking the 'this' in the argument list. */ | |
1392 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn) | |
1393 | && !same_type_p (TREE_VALUE (fn_arg_types), | |
1394 | TREE_VALUE (decl_arg_types))) | |
d955f6ea KL |
1395 | continue; |
1396 | ||
5fe7b654 GB |
1397 | /* In case of explicit specialization, we need to check if |
1398 | the number of template headers appearing in the specialization | |
1399 | is correct. This is usually done in check_explicit_specialization, | |
1400 | but the check done there cannot be exhaustive when specializing | |
1401 | member functions. Consider the following code: | |
1402 | ||
1403 | template <> void A<int>::f(int); | |
1404 | template <> template <> void A<int>::f(int); | |
1405 | ||
1406 | Assuming that A<int> is not itself an explicit specialization | |
1407 | already, the first line specializes "f" which is a non-template | |
1408 | member function, whilst the second line specializes "f" which | |
1409 | is a template member function. So both lines are syntactically | |
1410 | correct, and check_explicit_specialization does not reject | |
1411 | them. | |
1412 | ||
1413 | Here, we can do better, as we are matching the specialization | |
1414 | against the declarations. We count the number of template | |
1415 | headers, and we check if they match TEMPLATE_COUNT + 1 | |
1416 | (TEMPLATE_COUNT is the number of qualifying template classes, | |
1417 | plus there must be another header for the member template | |
1418 | itself). | |
1419 | ||
1420 | Notice that if header_count is zero, this is not a | |
1421 | specialization but rather a template instantiation, so there | |
1422 | is no check we can perform here. */ | |
1423 | if (header_count && header_count != template_count + 1) | |
1424 | continue; | |
1425 | ||
d955f6ea KL |
1426 | /* See whether this function might be a specialization of this |
1427 | template. */ | |
1428 | targs = get_bindings (fn, decl, explicit_targs); | |
1429 | ||
1430 | if (!targs) | |
1431 | /* We cannot deduce template arguments that when used to | |
1432 | specialize TMPL will produce DECL. */ | |
1433 | continue; | |
1434 | ||
1435 | /* Save this template, and the arguments deduced. */ | |
1436 | templates = tree_cons (targs, fn, templates); | |
1437 | } | |
03017874 MM |
1438 | else if (need_member_template) |
1439 | /* FN is an ordinary member function, and we need a | |
1440 | specialization of a member template. */ | |
d955f6ea | 1441 | ; |
03017874 MM |
1442 | else if (TREE_CODE (fn) != FUNCTION_DECL) |
1443 | /* We can get IDENTIFIER_NODEs here in certain erroneous | |
1444 | cases. */ | |
d955f6ea | 1445 | ; |
03017874 MM |
1446 | else if (!DECL_FUNCTION_MEMBER_P (fn)) |
1447 | /* This is just an ordinary non-member function. Nothing can | |
1448 | be a specialization of that. */ | |
d955f6ea | 1449 | ; |
3b82c249 KL |
1450 | else if (DECL_ARTIFICIAL (fn)) |
1451 | /* Cannot specialize functions that are created implicitly. */ | |
d955f6ea | 1452 | ; |
75650646 | 1453 | else |
03017874 MM |
1454 | { |
1455 | tree decl_arg_types; | |
386b8a85 | 1456 | |
03017874 MM |
1457 | /* This is an ordinary member function. However, since |
1458 | we're here, we can assume it's enclosing class is a | |
1459 | template class. For example, | |
1460 | ||
1461 | template <typename T> struct S { void f(); }; | |
1462 | template <> void S<int>::f() {} | |
1463 | ||
1464 | Here, S<int>::f is a non-template, but S<int> is a | |
1465 | template class. If FN has the same type as DECL, we | |
1466 | might be in business. */ | |
f5d47abd KL |
1467 | |
1468 | if (!DECL_TEMPLATE_INFO (fn)) | |
1469 | /* Its enclosing class is an explicit specialization | |
1470 | of a template class. This is not a candidate. */ | |
1471 | continue; | |
1472 | ||
03017874 MM |
1473 | if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)), |
1474 | TREE_TYPE (TREE_TYPE (fn)))) | |
1475 | /* The return types differ. */ | |
1476 | continue; | |
1477 | ||
1478 | /* Adjust the type of DECL in case FN is a static member. */ | |
1479 | decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1480 | if (DECL_STATIC_FUNCTION_P (fn) | |
1481 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1482 | decl_arg_types = TREE_CHAIN (decl_arg_types); | |
1483 | ||
1484 | if (compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
1485 | decl_arg_types)) | |
1486 | /* They match! */ | |
1487 | candidates = tree_cons (NULL_TREE, fn, candidates); | |
03017874 | 1488 | } |
386b8a85 | 1489 | } |
03017874 | 1490 | |
bf8f3f93 | 1491 | if (templates && TREE_CHAIN (templates)) |
386b8a85 | 1492 | { |
03017874 MM |
1493 | /* We have: |
1494 | ||
1495 | [temp.expl.spec] | |
1496 | ||
1497 | It is possible for a specialization with a given function | |
1498 | signature to be instantiated from more than one function | |
1499 | template. In such cases, explicit specification of the | |
1500 | template arguments must be used to uniquely identify the | |
1501 | function template specialization being specialized. | |
1502 | ||
1503 | Note that here, there's no suggestion that we're supposed to | |
1504 | determine which of the candidate templates is most | |
1505 | specialized. However, we, also have: | |
1506 | ||
1507 | [temp.func.order] | |
1508 | ||
1509 | Partial ordering of overloaded function template | |
1510 | declarations is used in the following contexts to select | |
1511 | the function template to which a function template | |
1512 | specialization refers: | |
1513 | ||
1514 | -- when an explicit specialization refers to a function | |
1515 | template. | |
1516 | ||
1517 | So, we do use the partial ordering rules, at least for now. | |
0e339752 | 1518 | This extension can only serve to make invalid programs valid, |
03017874 MM |
1519 | so it's safe. And, there is strong anecdotal evidence that |
1520 | the committee intended the partial ordering rules to apply; | |
1521 | the EDG front-end has that behavior, and John Spicer claims | |
1522 | that the committee simply forgot to delete the wording in | |
1523 | [temp.expl.spec]. */ | |
1524 | tree tmpl = most_specialized (templates, decl, explicit_targs); | |
1525 | if (tmpl && tmpl != error_mark_node) | |
1526 | { | |
1527 | targs = get_bindings (tmpl, decl, explicit_targs); | |
e1b3e07d | 1528 | templates = tree_cons (targs, tmpl, NULL_TREE); |
03017874 | 1529 | } |
e1467ff2 MM |
1530 | } |
1531 | ||
03017874 | 1532 | if (templates == NULL_TREE && candidates == NULL_TREE) |
e1467ff2 | 1533 | { |
0f51ccfc GDR |
1534 | cp_error_at ("template-id %qD for %q+D does not match any template " |
1535 | "declaration", | |
bf8f3f93 | 1536 | template_id, decl); |
03017874 | 1537 | return error_mark_node; |
386b8a85 | 1538 | } |
03017874 | 1539 | else if ((templates && TREE_CHAIN (templates)) |
bf8f3f93 MM |
1540 | || (candidates && TREE_CHAIN (candidates)) |
1541 | || (templates && candidates)) | |
386b8a85 | 1542 | { |
0f51ccfc | 1543 | cp_error_at ("ambiguous template specialization %qD for %q+D", |
bf8f3f93 MM |
1544 | template_id, decl); |
1545 | chainon (candidates, templates); | |
1546 | print_candidates (candidates); | |
03017874 | 1547 | return error_mark_node; |
386b8a85 JM |
1548 | } |
1549 | ||
c6002625 | 1550 | /* We have one, and exactly one, match. */ |
03017874 MM |
1551 | if (candidates) |
1552 | { | |
1553 | /* It was a specialization of an ordinary member function in a | |
1554 | template class. */ | |
1555 | *targs_out = copy_node (DECL_TI_ARGS (TREE_VALUE (candidates))); | |
1556 | return DECL_TI_TEMPLATE (TREE_VALUE (candidates)); | |
1557 | } | |
1558 | ||
1559 | /* It was a specialization of a template. */ | |
17aec3eb | 1560 | targs = DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates))); |
03017874 MM |
1561 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs)) |
1562 | { | |
1563 | *targs_out = copy_node (targs); | |
1564 | SET_TMPL_ARGS_LEVEL (*targs_out, | |
1565 | TMPL_ARGS_DEPTH (*targs_out), | |
1566 | TREE_PURPOSE (templates)); | |
1567 | } | |
1568 | else | |
1569 | *targs_out = TREE_PURPOSE (templates); | |
e1467ff2 | 1570 | return TREE_VALUE (templates); |
8d08fdba | 1571 | } |
8afa707f MM |
1572 | |
1573 | /* Returns a chain of parameter types, exactly like the SPEC_TYPES, | |
1574 | but with the default argument values filled in from those in the | |
1575 | TMPL_TYPES. */ | |
6757edfe | 1576 | |
8afa707f | 1577 | static tree |
3a978d72 NN |
1578 | copy_default_args_to_explicit_spec_1 (tree spec_types, |
1579 | tree tmpl_types) | |
8afa707f MM |
1580 | { |
1581 | tree new_spec_types; | |
1582 | ||
1583 | if (!spec_types) | |
1584 | return NULL_TREE; | |
1585 | ||
1586 | if (spec_types == void_list_node) | |
1587 | return void_list_node; | |
1588 | ||
1589 | /* Substitute into the rest of the list. */ | |
1590 | new_spec_types = | |
1591 | copy_default_args_to_explicit_spec_1 (TREE_CHAIN (spec_types), | |
1592 | TREE_CHAIN (tmpl_types)); | |
1593 | ||
1594 | /* Add the default argument for this parameter. */ | |
1595 | return hash_tree_cons (TREE_PURPOSE (tmpl_types), | |
1596 | TREE_VALUE (spec_types), | |
1597 | new_spec_types); | |
1598 | } | |
1599 | ||
1600 | /* DECL is an explicit specialization. Replicate default arguments | |
1601 | from the template it specializes. (That way, code like: | |
1602 | ||
1603 | template <class T> void f(T = 3); | |
1604 | template <> void f(double); | |
1605 | void g () { f (); } | |
1606 | ||
1607 | works, as required.) An alternative approach would be to look up | |
1608 | the correct default arguments at the call-site, but this approach | |
1609 | is consistent with how implicit instantiations are handled. */ | |
1610 | ||
1611 | static void | |
3a978d72 | 1612 | copy_default_args_to_explicit_spec (tree decl) |
8afa707f MM |
1613 | { |
1614 | tree tmpl; | |
1615 | tree spec_types; | |
1616 | tree tmpl_types; | |
1617 | tree new_spec_types; | |
1618 | tree old_type; | |
1619 | tree new_type; | |
1620 | tree t; | |
08c2df0f NS |
1621 | tree object_type = NULL_TREE; |
1622 | tree in_charge = NULL_TREE; | |
e0fff4b3 | 1623 | tree vtt = NULL_TREE; |
8afa707f MM |
1624 | |
1625 | /* See if there's anything we need to do. */ | |
1626 | tmpl = DECL_TI_TEMPLATE (decl); | |
1627 | tmpl_types = TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl))); | |
1628 | for (t = tmpl_types; t; t = TREE_CHAIN (t)) | |
1629 | if (TREE_PURPOSE (t)) | |
1630 | break; | |
1631 | if (!t) | |
1632 | return; | |
1633 | ||
1634 | old_type = TREE_TYPE (decl); | |
1635 | spec_types = TYPE_ARG_TYPES (old_type); | |
1636 | ||
8afa707f MM |
1637 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) |
1638 | { | |
08c2df0f NS |
1639 | /* Remove the this pointer, but remember the object's type for |
1640 | CV quals. */ | |
1641 | object_type = TREE_TYPE (TREE_VALUE (spec_types)); | |
8afa707f MM |
1642 | spec_types = TREE_CHAIN (spec_types); |
1643 | tmpl_types = TREE_CHAIN (tmpl_types); | |
08c2df0f | 1644 | |
8afa707f | 1645 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) |
08c2df0f NS |
1646 | { |
1647 | /* DECL may contain more parameters than TMPL due to the extra | |
1648 | in-charge parameter in constructors and destructors. */ | |
1649 | in_charge = spec_types; | |
1650 | spec_types = TREE_CHAIN (spec_types); | |
1651 | } | |
e0fff4b3 JM |
1652 | if (DECL_HAS_VTT_PARM_P (decl)) |
1653 | { | |
1654 | vtt = spec_types; | |
1655 | spec_types = TREE_CHAIN (spec_types); | |
1656 | } | |
8afa707f MM |
1657 | } |
1658 | ||
1659 | /* Compute the merged default arguments. */ | |
1660 | new_spec_types = | |
1661 | copy_default_args_to_explicit_spec_1 (spec_types, tmpl_types); | |
1662 | ||
08c2df0f NS |
1663 | /* Compute the new FUNCTION_TYPE. */ |
1664 | if (object_type) | |
8afa707f | 1665 | { |
e0fff4b3 JM |
1666 | if (vtt) |
1667 | new_spec_types = hash_tree_cons (TREE_PURPOSE (vtt), | |
1668 | TREE_VALUE (vtt), | |
1669 | new_spec_types); | |
1670 | ||
08c2df0f NS |
1671 | if (in_charge) |
1672 | /* Put the in-charge parameter back. */ | |
1673 | new_spec_types = hash_tree_cons (TREE_PURPOSE (in_charge), | |
1674 | TREE_VALUE (in_charge), | |
1675 | new_spec_types); | |
1676 | ||
43dc123f MM |
1677 | new_type = build_method_type_directly (object_type, |
1678 | TREE_TYPE (old_type), | |
1679 | new_spec_types); | |
8afa707f | 1680 | } |
8afa707f MM |
1681 | else |
1682 | new_type = build_function_type (TREE_TYPE (old_type), | |
08c2df0f | 1683 | new_spec_types); |
e9525111 MM |
1684 | new_type = cp_build_type_attribute_variant (new_type, |
1685 | TYPE_ATTRIBUTES (old_type)); | |
8afa707f MM |
1686 | new_type = build_exception_variant (new_type, |
1687 | TYPE_RAISES_EXCEPTIONS (old_type)); | |
1688 | TREE_TYPE (decl) = new_type; | |
1689 | } | |
1690 | ||
386b8a85 | 1691 | /* Check to see if the function just declared, as indicated in |
75650646 MM |
1692 | DECLARATOR, and in DECL, is a specialization of a function |
1693 | template. We may also discover that the declaration is an explicit | |
1694 | instantiation at this point. | |
1695 | ||
e1467ff2 | 1696 | Returns DECL, or an equivalent declaration that should be used |
03017874 MM |
1697 | instead if all goes well. Issues an error message if something is |
1698 | amiss. Returns error_mark_node if the error is not easily | |
1699 | recoverable. | |
75650646 | 1700 | |
75650646 MM |
1701 | FLAGS is a bitmask consisting of the following flags: |
1702 | ||
75650646 MM |
1703 | 2: The function has a definition. |
1704 | 4: The function is a friend. | |
75650646 MM |
1705 | |
1706 | The TEMPLATE_COUNT is the number of references to qualifying | |
1707 | template classes that appeared in the name of the function. For | |
1708 | example, in | |
1709 | ||
1710 | template <class T> struct S { void f(); }; | |
1711 | void S<int>::f(); | |
1712 | ||
1713 | the TEMPLATE_COUNT would be 1. However, explicitly specialized | |
1714 | classes are not counted in the TEMPLATE_COUNT, so that in | |
1715 | ||
1716 | template <class T> struct S {}; | |
1717 | template <> struct S<int> { void f(); } | |
36a117a5 | 1718 | template <> void S<int>::f(); |
75650646 MM |
1719 | |
1720 | the TEMPLATE_COUNT would be 0. (Note that this declaration is | |
0e339752 | 1721 | invalid; there should be no template <>.) |
75650646 MM |
1722 | |
1723 | If the function is a specialization, it is marked as such via | |
1724 | DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO | |
1725 | is set up correctly, and it is added to the list of specializations | |
1726 | for that template. */ | |
386b8a85 | 1727 | |
e1467ff2 | 1728 | tree |
3a978d72 NN |
1729 | check_explicit_specialization (tree declarator, |
1730 | tree decl, | |
1731 | int template_count, | |
1732 | int flags) | |
386b8a85 | 1733 | { |
75650646 MM |
1734 | int have_def = flags & 2; |
1735 | int is_friend = flags & 4; | |
1736 | int specialization = 0; | |
e1467ff2 | 1737 | int explicit_instantiation = 0; |
fd4de5ff | 1738 | int member_specialization = 0; |
75650646 MM |
1739 | tree ctype = DECL_CLASS_CONTEXT (decl); |
1740 | tree dname = DECL_NAME (decl); | |
74b846e0 | 1741 | tmpl_spec_kind tsk; |
386b8a85 | 1742 | |
f65b7de3 GB |
1743 | if (is_friend) |
1744 | { | |
1745 | if (!processing_specialization) | |
1746 | tsk = tsk_none; | |
1747 | else | |
1748 | tsk = tsk_excessive_parms; | |
1749 | } | |
1750 | else | |
1751 | tsk = current_tmpl_spec_kind (template_count); | |
75650646 | 1752 | |
74b846e0 MM |
1753 | switch (tsk) |
1754 | { | |
1755 | case tsk_none: | |
1756 | if (processing_specialization) | |
75650646 | 1757 | { |
fd4de5ff MM |
1758 | specialization = 1; |
1759 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
75650646 | 1760 | } |
74b846e0 | 1761 | else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) |
386b8a85 | 1762 | { |
74b846e0 MM |
1763 | if (is_friend) |
1764 | /* This could be something like: | |
75650646 | 1765 | |
74b846e0 MM |
1766 | template <class T> void f(T); |
1767 | class S { friend void f<>(int); } */ | |
1768 | specialization = 1; | |
1769 | else | |
1770 | { | |
1771 | /* This case handles bogus declarations like template <> | |
1772 | template <class T> void f<int>(); */ | |
1773 | ||
0f51ccfc GDR |
1774 | error ("template-id %qD in declaration of primary template", |
1775 | declarator); | |
74b846e0 MM |
1776 | return decl; |
1777 | } | |
1778 | } | |
1779 | break; | |
1780 | ||
1781 | case tsk_invalid_member_spec: | |
1782 | /* The error has already been reported in | |
1783 | check_specialization_scope. */ | |
1784 | return error_mark_node; | |
1785 | ||
1786 | case tsk_invalid_expl_inst: | |
33bd39a2 | 1787 | error ("template parameter list used in explicit instantiation"); |
74b846e0 MM |
1788 | |
1789 | /* Fall through. */ | |
1790 | ||
1791 | case tsk_expl_inst: | |
fd4de5ff | 1792 | if (have_def) |
33bd39a2 | 1793 | error ("definition provided for explicit instantiation"); |
74b846e0 | 1794 | |
fd4de5ff | 1795 | explicit_instantiation = 1; |
74b846e0 | 1796 | break; |
fd4de5ff | 1797 | |
74b846e0 | 1798 | case tsk_excessive_parms: |
f03adc6b GB |
1799 | case tsk_insufficient_parms: |
1800 | if (tsk == tsk_excessive_parms) | |
0f51ccfc | 1801 | error ("too many template parameter lists in declaration of %qD", |
f03adc6b GB |
1802 | decl); |
1803 | else if (template_header_count) | |
0f51ccfc | 1804 | error("too few template parameter lists in declaration of %qD", decl); |
f03adc6b | 1805 | else |
0f51ccfc | 1806 | error("explicit specialization of %qD must be introduced by " |
9e637a26 | 1807 | "%<template <>%>", decl); |
75650646 | 1808 | |
74b846e0 MM |
1809 | /* Fall through. */ |
1810 | case tsk_expl_spec: | |
1811 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1812 | if (ctype) | |
1813 | member_specialization = 1; | |
1814 | else | |
1815 | specialization = 1; | |
1816 | break; | |
74b846e0 MM |
1817 | |
1818 | case tsk_template: | |
1819 | if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
c6f2ed0d | 1820 | { |
fd4de5ff MM |
1821 | /* This case handles bogus declarations like template <> |
1822 | template <class T> void f<int>(); */ | |
75650646 | 1823 | |
655dc6ee | 1824 | if (uses_template_parms (declarator)) |
0f51ccfc | 1825 | error ("function template partial specialization %qD " |
e1e93ad8 | 1826 | "is not allowed", declarator); |
655dc6ee | 1827 | else |
0f51ccfc GDR |
1828 | error ("template-id %qD in declaration of primary template", |
1829 | declarator); | |
fd4de5ff | 1830 | return decl; |
386b8a85 | 1831 | } |
74b846e0 MM |
1832 | |
1833 | if (ctype && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype)) | |
1834 | /* This is a specialization of a member template, without | |
1835 | specialization the containing class. Something like: | |
1836 | ||
1837 | template <class T> struct S { | |
1838 | template <class U> void f (U); | |
1839 | }; | |
1840 | template <> template <class U> void S<int>::f(U) {} | |
1841 | ||
1842 | That's a specialization -- but of the entire template. */ | |
1843 | specialization = 1; | |
1844 | break; | |
1845 | ||
1846 | default: | |
315fb5db | 1847 | gcc_unreachable (); |
75650646 | 1848 | } |
386b8a85 | 1849 | |
670960ac JM |
1850 | if (specialization || member_specialization) |
1851 | { | |
1852 | tree t = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1853 | for (; t; t = TREE_CHAIN (t)) | |
1854 | if (TREE_PURPOSE (t)) | |
1855 | { | |
33bd39a2 | 1856 | pedwarn |
8251199e | 1857 | ("default argument specified in explicit specialization"); |
670960ac JM |
1858 | break; |
1859 | } | |
f3400fe2 | 1860 | if (current_lang_name == lang_name_c) |
33bd39a2 | 1861 | error ("template specialization with C linkage"); |
670960ac JM |
1862 | } |
1863 | ||
e1467ff2 | 1864 | if (specialization || member_specialization || explicit_instantiation) |
75650646 MM |
1865 | { |
1866 | tree tmpl = NULL_TREE; | |
1867 | tree targs = NULL_TREE; | |
75650646 MM |
1868 | |
1869 | /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */ | |
386b8a85 JM |
1870 | if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR) |
1871 | { | |
1872 | tree fns; | |
1873 | ||
50bc768d | 1874 | gcc_assert (TREE_CODE (declarator) == IDENTIFIER_NODE); |
2f54a1db | 1875 | if (ctype) |
386b8a85 | 1876 | fns = dname; |
2f54a1db GB |
1877 | else |
1878 | { | |
1879 | /* If there is no class context, the explicit instantiation | |
1880 | must be at namespace scope. */ | |
50bc768d | 1881 | gcc_assert (DECL_NAMESPACE_SCOPE_P (decl)); |
2f54a1db GB |
1882 | |
1883 | /* Find the namespace binding, using the declaration | |
1884 | context. */ | |
1885 | fns = namespace_binding (dname, CP_DECL_CONTEXT (decl)); | |
1886 | } | |
386b8a85 | 1887 | |
2f54a1db | 1888 | declarator = lookup_template_function (fns, NULL_TREE); |
386b8a85 JM |
1889 | } |
1890 | ||
f2e48b67 BK |
1891 | if (declarator == error_mark_node) |
1892 | return error_mark_node; | |
1893 | ||
75650646 MM |
1894 | if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype)) |
1895 | { | |
8ec2ac34 | 1896 | if (!explicit_instantiation) |
0e339752 | 1897 | /* A specialization in class scope. This is invalid, |
6c30752f MM |
1898 | but the error will already have been flagged by |
1899 | check_specialization_scope. */ | |
1900 | return error_mark_node; | |
8ec2ac34 | 1901 | else |
b370501f | 1902 | { |
0e339752 | 1903 | /* It's not valid to write an explicit instantiation in |
b370501f | 1904 | class scope, e.g.: |
8ec2ac34 | 1905 | |
b370501f | 1906 | class C { template void f(); } |
8ec2ac34 | 1907 | |
b370501f KG |
1908 | This case is caught by the parser. However, on |
1909 | something like: | |
8ec2ac34 | 1910 | |
b370501f | 1911 | template class C { void f(); }; |
8ec2ac34 | 1912 | |
0e339752 | 1913 | (which is invalid) we can get here. The error will be |
b370501f KG |
1914 | issued later. */ |
1915 | ; | |
1916 | } | |
8ec2ac34 | 1917 | |
e1467ff2 | 1918 | return decl; |
75650646 MM |
1919 | } |
1920 | else if (ctype != NULL_TREE | |
1921 | && (TREE_CODE (TREE_OPERAND (declarator, 0)) == | |
1922 | IDENTIFIER_NODE)) | |
386b8a85 | 1923 | { |
75650646 MM |
1924 | /* Find the list of functions in ctype that have the same |
1925 | name as the declared function. */ | |
1926 | tree name = TREE_OPERAND (declarator, 0); | |
03017874 MM |
1927 | tree fns = NULL_TREE; |
1928 | int idx; | |
1929 | ||
8ba658ee | 1930 | if (constructor_name_p (name, ctype)) |
386b8a85 | 1931 | { |
75650646 MM |
1932 | int is_constructor = DECL_CONSTRUCTOR_P (decl); |
1933 | ||
1934 | if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype) | |
9f4faeae | 1935 | : !CLASSTYPE_DESTRUCTORS (ctype)) |
75650646 MM |
1936 | { |
1937 | /* From [temp.expl.spec]: | |
e1467ff2 | 1938 | |
75650646 MM |
1939 | If such an explicit specialization for the member |
1940 | of a class template names an implicitly-declared | |
1941 | special member function (clause _special_), the | |
e1467ff2 MM |
1942 | program is ill-formed. |
1943 | ||
1944 | Similar language is found in [temp.explicit]. */ | |
33bd39a2 | 1945 | error ("specialization of implicitly-declared special member function"); |
03017874 | 1946 | return error_mark_node; |
75650646 | 1947 | } |
386b8a85 | 1948 | |
42da2fd8 | 1949 | name = is_constructor ? ctor_identifier : dtor_identifier; |
75650646 | 1950 | } |
42da2fd8 | 1951 | |
421844e7 | 1952 | if (!DECL_CONV_FN_P (decl)) |
03017874 MM |
1953 | { |
1954 | idx = lookup_fnfields_1 (ctype, name); | |
1955 | if (idx >= 0) | |
aaaa46d2 | 1956 | fns = VEC_index (tree, CLASSTYPE_METHOD_VEC (ctype), idx); |
03017874 MM |
1957 | } |
1958 | else | |
1959 | { | |
aaaa46d2 MM |
1960 | VEC(tree) *methods; |
1961 | tree ovl; | |
03017874 MM |
1962 | |
1963 | /* For a type-conversion operator, we cannot do a | |
1964 | name-based lookup. We might be looking for `operator | |
1965 | int' which will be a specialization of `operator T'. | |
1966 | So, we find *all* the conversion operators, and then | |
1967 | select from them. */ | |
1968 | fns = NULL_TREE; | |
1969 | ||
1970 | methods = CLASSTYPE_METHOD_VEC (ctype); | |
1971 | if (methods) | |
5dd236e2 | 1972 | for (idx = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 1973 | VEC_iterate (tree, methods, idx, ovl); |
aaaa46d2 | 1974 | ++idx) |
03017874 | 1975 | { |
aaaa46d2 | 1976 | if (!DECL_CONV_FN_P (OVL_CURRENT (ovl))) |
03017874 MM |
1977 | /* There are no more conversion functions. */ |
1978 | break; | |
1979 | ||
1980 | /* Glue all these conversion functions together | |
1981 | with those we already have. */ | |
1982 | for (; ovl; ovl = OVL_NEXT (ovl)) | |
1983 | fns = ovl_cons (OVL_CURRENT (ovl), fns); | |
1984 | } | |
1985 | } | |
1986 | ||
386b8a85 JM |
1987 | if (fns == NULL_TREE) |
1988 | { | |
0f51ccfc | 1989 | error ("no member function %qD declared in %qT", name, ctype); |
03017874 | 1990 | return error_mark_node; |
386b8a85 JM |
1991 | } |
1992 | else | |
1993 | TREE_OPERAND (declarator, 0) = fns; | |
1994 | } | |
75650646 | 1995 | |
e1467ff2 MM |
1996 | /* Figure out what exactly is being specialized at this point. |
1997 | Note that for an explicit instantiation, even one for a | |
38e01259 | 1998 | member function, we cannot tell apriori whether the |
e1467ff2 | 1999 | instantiation is for a member template, or just a member |
36a117a5 MM |
2000 | function of a template class. Even if a member template is |
2001 | being instantiated, the member template arguments may be | |
2002 | elided if they can be deduced from the rest of the | |
2003 | declaration. */ | |
e1467ff2 MM |
2004 | tmpl = determine_specialization (declarator, decl, |
2005 | &targs, | |
5fe7b654 GB |
2006 | member_specialization, |
2007 | template_count); | |
386b8a85 | 2008 | |
03017874 MM |
2009 | if (!tmpl || tmpl == error_mark_node) |
2010 | /* We couldn't figure out what this declaration was | |
2011 | specializing. */ | |
2012 | return error_mark_node; | |
2013 | else | |
386b8a85 | 2014 | { |
25aab5d0 | 2015 | tree gen_tmpl = most_general_template (tmpl); |
36a117a5 | 2016 | |
e1467ff2 MM |
2017 | if (explicit_instantiation) |
2018 | { | |
03d0f4af | 2019 | /* We don't set DECL_EXPLICIT_INSTANTIATION here; that |
25aab5d0 MM |
2020 | is done by do_decl_instantiation later. */ |
2021 | ||
2022 | int arg_depth = TMPL_ARGS_DEPTH (targs); | |
2023 | int parm_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)); | |
2024 | ||
2025 | if (arg_depth > parm_depth) | |
2026 | { | |
2027 | /* If TMPL is not the most general template (for | |
2028 | example, if TMPL is a friend template that is | |
2029 | injected into namespace scope), then there will | |
dc957d14 | 2030 | be too many levels of TARGS. Remove some of them |
25aab5d0 MM |
2031 | here. */ |
2032 | int i; | |
2033 | tree new_targs; | |
2034 | ||
f31c0a32 | 2035 | new_targs = make_tree_vec (parm_depth); |
25aab5d0 MM |
2036 | for (i = arg_depth - parm_depth; i < arg_depth; ++i) |
2037 | TREE_VEC_ELT (new_targs, i - (arg_depth - parm_depth)) | |
2038 | = TREE_VEC_ELT (targs, i); | |
2039 | targs = new_targs; | |
2040 | } | |
2041 | ||
3e4a3562 | 2042 | return instantiate_template (tmpl, targs, tf_error); |
e1467ff2 | 2043 | } |
74b846e0 | 2044 | |
6c07f448 KL |
2045 | /* If we thought that the DECL was a member function, but it |
2046 | turns out to be specializing a static member function, | |
4546865e | 2047 | make DECL a static member function as well. */ |
6c07f448 KL |
2048 | if (DECL_STATIC_FUNCTION_P (tmpl) |
2049 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
4546865e | 2050 | revert_static_member_fn (decl); |
6c07f448 | 2051 | |
f9a7ae04 MM |
2052 | /* If this is a specialization of a member template of a |
2053 | template class. In we want to return the TEMPLATE_DECL, | |
2054 | not the specialization of it. */ | |
74b846e0 MM |
2055 | if (tsk == tsk_template) |
2056 | { | |
2057 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
f9a7ae04 | 2058 | DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl)) = NULL_TREE; |
b190f239 NS |
2059 | if (have_def) |
2060 | { | |
f31686a3 RH |
2061 | DECL_SOURCE_LOCATION (tmpl) = DECL_SOURCE_LOCATION (decl); |
2062 | DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (tmpl)) | |
2063 | = DECL_SOURCE_LOCATION (decl); | |
08167d1c AO |
2064 | /* We want to use the argument list specified in the |
2065 | definition, not in the original declaration. */ | |
2066 | DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (tmpl)) | |
2067 | = DECL_ARGUMENTS (decl); | |
b190f239 | 2068 | } |
74b846e0 MM |
2069 | return tmpl; |
2070 | } | |
2071 | ||
36a117a5 | 2072 | /* Set up the DECL_TEMPLATE_INFO for DECL. */ |
e1b3e07d | 2073 | DECL_TEMPLATE_INFO (decl) = tree_cons (tmpl, targs, NULL_TREE); |
36a117a5 | 2074 | |
8afa707f MM |
2075 | /* Inherit default function arguments from the template |
2076 | DECL is specializing. */ | |
2077 | copy_default_args_to_explicit_spec (decl); | |
2078 | ||
c750255c MM |
2079 | /* This specialization has the same protection as the |
2080 | template it specializes. */ | |
2081 | TREE_PRIVATE (decl) = TREE_PRIVATE (gen_tmpl); | |
2082 | TREE_PROTECTED (decl) = TREE_PROTECTED (gen_tmpl); | |
2083 | ||
386b8a85 | 2084 | if (is_friend && !have_def) |
36a117a5 MM |
2085 | /* This is not really a declaration of a specialization. |
2086 | It's just the name of an instantiation. But, it's not | |
2087 | a request for an instantiation, either. */ | |
fbf1c34b | 2088 | SET_DECL_IMPLICIT_INSTANTIATION (decl); |
08511114 KL |
2089 | else if (DECL_CONSTRUCTOR_P (decl) || DECL_DESTRUCTOR_P (decl)) |
2090 | /* This is indeed a specialization. In case of constructors | |
2091 | and destructors, we need in-charge and not-in-charge | |
2092 | versions in V3 ABI. */ | |
2093 | clone_function_decl (decl, /*update_method_vec_p=*/0); | |
75650646 | 2094 | |
36a117a5 MM |
2095 | /* Register this specialization so that we can find it |
2096 | again. */ | |
2097 | decl = register_specialization (decl, gen_tmpl, targs); | |
386b8a85 JM |
2098 | } |
2099 | } | |
75650646 | 2100 | |
e1467ff2 | 2101 | return decl; |
386b8a85 | 2102 | } |
75650646 | 2103 | |
75650646 MM |
2104 | /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template |
2105 | parameters. These are represented in the same format used for | |
2106 | DECL_TEMPLATE_PARMS. */ | |
2107 | ||
50bc768d NS |
2108 | int |
2109 | comp_template_parms (tree parms1, tree parms2) | |
75650646 MM |
2110 | { |
2111 | tree p1; | |
2112 | tree p2; | |
2113 | ||
2114 | if (parms1 == parms2) | |
2115 | return 1; | |
2116 | ||
2117 | for (p1 = parms1, p2 = parms2; | |
2118 | p1 != NULL_TREE && p2 != NULL_TREE; | |
2119 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2)) | |
2120 | { | |
2121 | tree t1 = TREE_VALUE (p1); | |
2122 | tree t2 = TREE_VALUE (p2); | |
2123 | int i; | |
2124 | ||
50bc768d NS |
2125 | gcc_assert (TREE_CODE (t1) == TREE_VEC); |
2126 | gcc_assert (TREE_CODE (t2) == TREE_VEC); | |
75650646 MM |
2127 | |
2128 | if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2)) | |
2129 | return 0; | |
2130 | ||
2131 | for (i = 0; i < TREE_VEC_LENGTH (t2); ++i) | |
2132 | { | |
2133 | tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i)); | |
2134 | tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i)); | |
2135 | ||
2136 | if (TREE_CODE (parm1) != TREE_CODE (parm2)) | |
2137 | return 0; | |
2138 | ||
2139 | if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM) | |
2140 | continue; | |
3bfdc719 | 2141 | else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2))) |
75650646 MM |
2142 | return 0; |
2143 | } | |
2144 | } | |
2145 | ||
2146 | if ((p1 != NULL_TREE) != (p2 != NULL_TREE)) | |
2147 | /* One set of parameters has more parameters lists than the | |
2148 | other. */ | |
2149 | return 0; | |
2150 | ||
2151 | return 1; | |
2152 | } | |
2153 | ||
f3400fe2 JM |
2154 | /* Complain if DECL shadows a template parameter. |
2155 | ||
2156 | [temp.local]: A template-parameter shall not be redeclared within its | |
2157 | scope (including nested scopes). */ | |
2158 | ||
2159 | void | |
3a978d72 | 2160 | check_template_shadow (tree decl) |
f3400fe2 | 2161 | { |
8f032717 MM |
2162 | tree olddecl; |
2163 | ||
b5d9b9ab MM |
2164 | /* If we're not in a template, we can't possibly shadow a template |
2165 | parameter. */ | |
2166 | if (!current_template_parms) | |
2167 | return; | |
2168 | ||
2169 | /* Figure out what we're shadowing. */ | |
8f032717 MM |
2170 | if (TREE_CODE (decl) == OVERLOAD) |
2171 | decl = OVL_CURRENT (decl); | |
90ea9897 | 2172 | olddecl = innermost_non_namespace_value (DECL_NAME (decl)); |
f3400fe2 | 2173 | |
b5d9b9ab MM |
2174 | /* If there's no previous binding for this name, we're not shadowing |
2175 | anything, let alone a template parameter. */ | |
2176 | if (!olddecl) | |
2177 | return; | |
2178 | ||
2179 | /* If we're not shadowing a template parameter, we're done. Note | |
2180 | that OLDDECL might be an OVERLOAD (or perhaps even an | |
2181 | ERROR_MARK), so we can't just blithely assume it to be a _DECL | |
2182 | node. */ | |
2f939d94 | 2183 | if (!DECL_P (olddecl) || !DECL_TEMPLATE_PARM_P (olddecl)) |
b5d9b9ab MM |
2184 | return; |
2185 | ||
2186 | /* We check for decl != olddecl to avoid bogus errors for using a | |
2187 | name inside a class. We check TPFI to avoid duplicate errors for | |
2188 | inline member templates. */ | |
2189 | if (decl == olddecl | |
2190 | || TEMPLATE_PARMS_FOR_INLINE (current_template_parms)) | |
2191 | return; | |
2192 | ||
0f51ccfc GDR |
2193 | cp_error_at ("declaration of %q#D", decl); |
2194 | cp_error_at (" shadows template parm %q#D", olddecl); | |
f3400fe2 | 2195 | } |
22a7be53 | 2196 | |
f3400fe2 | 2197 | /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL, |
f84b4be9 JM |
2198 | ORIG_LEVEL, DECL, and TYPE. */ |
2199 | ||
2200 | static tree | |
3a978d72 NN |
2201 | build_template_parm_index (int index, |
2202 | int level, | |
2203 | int orig_level, | |
2204 | tree decl, | |
2205 | tree type) | |
f84b4be9 JM |
2206 | { |
2207 | tree t = make_node (TEMPLATE_PARM_INDEX); | |
2208 | TEMPLATE_PARM_IDX (t) = index; | |
2209 | TEMPLATE_PARM_LEVEL (t) = level; | |
2210 | TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level; | |
2211 | TEMPLATE_PARM_DECL (t) = decl; | |
2212 | TREE_TYPE (t) = type; | |
3e4a3562 | 2213 | TREE_CONSTANT (t) = TREE_CONSTANT (decl); |
6de9cd9a | 2214 | TREE_INVARIANT (t) = TREE_INVARIANT (decl); |
3e4a3562 | 2215 | TREE_READONLY (t) = TREE_READONLY (decl); |
f84b4be9 JM |
2216 | |
2217 | return t; | |
2218 | } | |
2219 | ||
f84b4be9 | 2220 | /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose |
93cdc044 | 2221 | TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a |
f84b4be9 JM |
2222 | TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a |
2223 | new one is created. */ | |
2224 | ||
2225 | static tree | |
3a978d72 | 2226 | reduce_template_parm_level (tree index, tree type, int levels) |
f84b4be9 JM |
2227 | { |
2228 | if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE | |
2229 | || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index)) | |
93cdc044 | 2230 | != TEMPLATE_PARM_LEVEL (index) - levels)) |
f84b4be9 | 2231 | { |
3e4a3562 NS |
2232 | tree orig_decl = TEMPLATE_PARM_DECL (index); |
2233 | tree decl, t; | |
2234 | ||
2235 | decl = build_decl (TREE_CODE (orig_decl), DECL_NAME (orig_decl), type); | |
2236 | TREE_CONSTANT (decl) = TREE_CONSTANT (orig_decl); | |
6de9cd9a | 2237 | TREE_INVARIANT (decl) = TREE_INVARIANT (orig_decl); |
3e4a3562 NS |
2238 | TREE_READONLY (decl) = TREE_READONLY (orig_decl); |
2239 | DECL_ARTIFICIAL (decl) = 1; | |
2240 | SET_DECL_TEMPLATE_PARM_P (decl); | |
2241 | ||
2242 | t = build_template_parm_index (TEMPLATE_PARM_IDX (index), | |
93cdc044 | 2243 | TEMPLATE_PARM_LEVEL (index) - levels, |
f84b4be9 JM |
2244 | TEMPLATE_PARM_ORIG_LEVEL (index), |
2245 | decl, type); | |
2246 | TEMPLATE_PARM_DESCENDANTS (index) = t; | |
cae40af6 JM |
2247 | |
2248 | /* Template template parameters need this. */ | |
2249 | DECL_TEMPLATE_PARMS (decl) | |
2250 | = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index)); | |
f84b4be9 JM |
2251 | } |
2252 | ||
2253 | return TEMPLATE_PARM_DESCENDANTS (index); | |
2254 | } | |
2255 | ||
8d08fdba | 2256 | /* Process information from new template parameter NEXT and append it to the |
058b15c1 MM |
2257 | LIST being built. This new parameter is a non-type parameter iff |
2258 | IS_NON_TYPE is true. */ | |
e92cc029 | 2259 | |
8d08fdba | 2260 | tree |
058b15c1 | 2261 | process_template_parm (tree list, tree next, bool is_non_type) |
8d08fdba MS |
2262 | { |
2263 | tree parm; | |
2264 | tree decl = 0; | |
a292b002 | 2265 | tree defval; |
058b15c1 | 2266 | int idx; |
f84b4be9 | 2267 | |
8d08fdba | 2268 | parm = next; |
50bc768d | 2269 | gcc_assert (TREE_CODE (parm) == TREE_LIST); |
a292b002 | 2270 | defval = TREE_PURPOSE (parm); |
5566b478 MS |
2271 | |
2272 | if (list) | |
2273 | { | |
2274 | tree p = TREE_VALUE (tree_last (list)); | |
2275 | ||
1899c3a4 | 2276 | if (TREE_CODE (p) == TYPE_DECL || TREE_CODE (p) == TEMPLATE_DECL) |
5566b478 MS |
2277 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p)); |
2278 | else | |
f84b4be9 | 2279 | idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p)); |
5566b478 MS |
2280 | ++idx; |
2281 | } | |
2282 | else | |
2283 | idx = 0; | |
2284 | ||
058b15c1 | 2285 | if (is_non_type) |
8d08fdba | 2286 | { |
058b15c1 MM |
2287 | parm = TREE_VALUE (parm); |
2288 | ||
833aa4c4 | 2289 | SET_DECL_TEMPLATE_PARM_P (parm); |
d490621d MM |
2290 | |
2291 | /* [temp.param] | |
2292 | ||
2293 | The top-level cv-qualifiers on the template-parameter are | |
2294 | ignored when determining its type. */ | |
2295 | TREE_TYPE (parm) = TYPE_MAIN_VARIANT (TREE_TYPE (parm)); | |
2296 | ||
8d08fdba | 2297 | /* A template parameter is not modifiable. */ |
6de9cd9a DN |
2298 | TREE_CONSTANT (parm) = 1; |
2299 | TREE_INVARIANT (parm) = 1; | |
2300 | TREE_READONLY (parm) = 1; | |
11b810f1 | 2301 | if (invalid_nontype_parm_type_p (TREE_TYPE (parm), 1)) |
db3f4e4e | 2302 | TREE_TYPE (parm) = void_type_node; |
8d08fdba | 2303 | decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm)); |
6de9cd9a DN |
2304 | TREE_CONSTANT (decl) = 1; |
2305 | TREE_INVARIANT (decl) = 1; | |
2306 | TREE_READONLY (decl) = 1; | |
f84b4be9 JM |
2307 | DECL_INITIAL (parm) = DECL_INITIAL (decl) |
2308 | = build_template_parm_index (idx, processing_template_decl, | |
2309 | processing_template_decl, | |
2310 | decl, TREE_TYPE (parm)); | |
8d08fdba MS |
2311 | } |
2312 | else | |
2313 | { | |
73b0fce8 | 2314 | tree t; |
058b15c1 | 2315 | parm = TREE_VALUE (TREE_VALUE (parm)); |
73b0fce8 KL |
2316 | |
2317 | if (parm && TREE_CODE (parm) == TEMPLATE_DECL) | |
2318 | { | |
33848bb0 | 2319 | t = make_aggr_type (TEMPLATE_TEMPLATE_PARM); |
73b0fce8 KL |
2320 | /* This is for distinguishing between real templates and template |
2321 | template parameters */ | |
2322 | TREE_TYPE (parm) = t; | |
2323 | TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t; | |
2324 | decl = parm; | |
2325 | } | |
2326 | else | |
2327 | { | |
33848bb0 | 2328 | t = make_aggr_type (TEMPLATE_TYPE_PARM); |
f4f206f4 | 2329 | /* parm is either IDENTIFIER_NODE or NULL_TREE. */ |
73b0fce8 KL |
2330 | decl = build_decl (TYPE_DECL, parm, t); |
2331 | } | |
2332 | ||
d2e5ee5c MS |
2333 | TYPE_NAME (t) = decl; |
2334 | TYPE_STUB_DECL (t) = decl; | |
a292b002 | 2335 | parm = decl; |
f84b4be9 JM |
2336 | TEMPLATE_TYPE_PARM_INDEX (t) |
2337 | = build_template_parm_index (idx, processing_template_decl, | |
2338 | processing_template_decl, | |
2339 | decl, TREE_TYPE (parm)); | |
8d08fdba | 2340 | } |
c727aa5e | 2341 | DECL_ARTIFICIAL (decl) = 1; |
cd9f6678 | 2342 | SET_DECL_TEMPLATE_PARM_P (decl); |
8d08fdba | 2343 | pushdecl (decl); |
a292b002 | 2344 | parm = build_tree_list (defval, parm); |
8d08fdba MS |
2345 | return chainon (list, parm); |
2346 | } | |
2347 | ||
2348 | /* The end of a template parameter list has been reached. Process the | |
2349 | tree list into a parameter vector, converting each parameter into a more | |
2350 | useful form. Type parameters are saved as IDENTIFIER_NODEs, and others | |
2351 | as PARM_DECLs. */ | |
2352 | ||
2353 | tree | |
3a978d72 | 2354 | end_template_parm_list (tree parms) |
8d08fdba | 2355 | { |
5566b478 | 2356 | int nparms; |
9471d3e2 | 2357 | tree parm, next; |
5566b478 MS |
2358 | tree saved_parmlist = make_tree_vec (list_length (parms)); |
2359 | ||
5566b478 | 2360 | current_template_parms |
4890c2f4 | 2361 | = tree_cons (size_int (processing_template_decl), |
5566b478 | 2362 | saved_parmlist, current_template_parms); |
8d08fdba | 2363 | |
9471d3e2 NS |
2364 | for (parm = parms, nparms = 0; parm; parm = next, nparms++) |
2365 | { | |
2366 | next = TREE_CHAIN (parm); | |
2367 | TREE_VEC_ELT (saved_parmlist, nparms) = parm; | |
2368 | TREE_CHAIN (parm) = NULL_TREE; | |
2369 | } | |
a292b002 | 2370 | |
67ffc812 MM |
2371 | --processing_template_parmlist; |
2372 | ||
8d08fdba MS |
2373 | return saved_parmlist; |
2374 | } | |
2375 | ||
5566b478 MS |
2376 | /* end_template_decl is called after a template declaration is seen. */ |
2377 | ||
8d08fdba | 2378 | void |
3a978d72 | 2379 | end_template_decl (void) |
8d08fdba | 2380 | { |
386b8a85 JM |
2381 | reset_specialization (); |
2382 | ||
5156628f | 2383 | if (! processing_template_decl) |
73aad9b9 JM |
2384 | return; |
2385 | ||
5566b478 | 2386 | /* This matches the pushlevel in begin_template_parm_list. */ |
74b846e0 | 2387 | finish_scope (); |
8d08fdba | 2388 | |
5566b478 MS |
2389 | --processing_template_decl; |
2390 | current_template_parms = TREE_CHAIN (current_template_parms); | |
5566b478 | 2391 | } |
8d08fdba | 2392 | |
36a117a5 MM |
2393 | /* Given a template argument vector containing the template PARMS. |
2394 | The innermost PARMS are given first. */ | |
9a3b49ac MS |
2395 | |
2396 | tree | |
3a978d72 | 2397 | current_template_args (void) |
5566b478 | 2398 | { |
36a117a5 | 2399 | tree header; |
b370501f | 2400 | tree args = NULL_TREE; |
36a117a5 | 2401 | int length = TMPL_PARMS_DEPTH (current_template_parms); |
98c1c668 JM |
2402 | int l = length; |
2403 | ||
36a117a5 MM |
2404 | /* If there is only one level of template parameters, we do not |
2405 | create a TREE_VEC of TREE_VECs. Instead, we return a single | |
2406 | TREE_VEC containing the arguments. */ | |
2407 | if (length > 1) | |
2408 | args = make_tree_vec (length); | |
2409 | ||
2410 | for (header = current_template_parms; header; header = TREE_CHAIN (header)) | |
8d08fdba | 2411 | { |
5566b478 | 2412 | tree a = copy_node (TREE_VALUE (header)); |
36a117a5 MM |
2413 | int i; |
2414 | ||
5566b478 | 2415 | TREE_TYPE (a) = NULL_TREE; |
36a117a5 | 2416 | for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i) |
5566b478 | 2417 | { |
98c1c668 JM |
2418 | tree t = TREE_VEC_ELT (a, i); |
2419 | ||
36a117a5 | 2420 | /* T will be a list if we are called from within a |
98c1c668 JM |
2421 | begin/end_template_parm_list pair, but a vector directly |
2422 | if within a begin/end_member_template_processing pair. */ | |
2423 | if (TREE_CODE (t) == TREE_LIST) | |
2424 | { | |
2425 | t = TREE_VALUE (t); | |
2426 | ||
73b0fce8 KL |
2427 | if (TREE_CODE (t) == TYPE_DECL |
2428 | || TREE_CODE (t) == TEMPLATE_DECL) | |
98c1c668 JM |
2429 | t = TREE_TYPE (t); |
2430 | else | |
2431 | t = DECL_INITIAL (t); | |
36a117a5 | 2432 | TREE_VEC_ELT (a, i) = t; |
98c1c668 | 2433 | } |
5566b478 | 2434 | } |
36a117a5 MM |
2435 | |
2436 | if (length > 1) | |
2437 | TREE_VEC_ELT (args, --l) = a; | |
2438 | else | |
2439 | args = a; | |
8d08fdba MS |
2440 | } |
2441 | ||
9a3b49ac MS |
2442 | return args; |
2443 | } | |
75650646 | 2444 | |
e1467ff2 | 2445 | /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated |
c7222c02 | 2446 | template PARMS. If MEMBER_TEMPLATE_P is true, the new template is |
ee81147e | 2447 | a member template. Used by push_template_decl below. */ |
e1467ff2 | 2448 | |
75650646 | 2449 | static tree |
c7222c02 | 2450 | build_template_decl (tree decl, tree parms, bool member_template_p) |
75650646 MM |
2451 | { |
2452 | tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE); | |
2453 | DECL_TEMPLATE_PARMS (tmpl) = parms; | |
2454 | DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl); | |
c7222c02 | 2455 | DECL_MEMBER_TEMPLATE_P (tmpl) = member_template_p; |
75650646 MM |
2456 | if (DECL_LANG_SPECIFIC (decl)) |
2457 | { | |
8f032717 MM |
2458 | DECL_STATIC_FUNCTION_P (tmpl) = DECL_STATIC_FUNCTION_P (decl); |
2459 | DECL_CONSTRUCTOR_P (tmpl) = DECL_CONSTRUCTOR_P (decl); | |
c8460010 | 2460 | DECL_DESTRUCTOR_P (tmpl) = DECL_DESTRUCTOR_P (decl); |
11f98788 | 2461 | DECL_NONCONVERTING_P (tmpl) = DECL_NONCONVERTING_P (decl); |
1f6e1acc AS |
2462 | DECL_ASSIGNMENT_OPERATOR_P (tmpl) = DECL_ASSIGNMENT_OPERATOR_P (decl); |
2463 | if (DECL_OVERLOADED_OPERATOR_P (decl)) | |
2464 | SET_OVERLOADED_OPERATOR_CODE (tmpl, | |
2465 | DECL_OVERLOADED_OPERATOR_P (decl)); | |
75650646 MM |
2466 | } |
2467 | ||
2468 | return tmpl; | |
2469 | } | |
2470 | ||
050367a3 MM |
2471 | struct template_parm_data |
2472 | { | |
6c30752f MM |
2473 | /* The level of the template parameters we are currently |
2474 | processing. */ | |
050367a3 | 2475 | int level; |
6c30752f MM |
2476 | |
2477 | /* The index of the specialization argument we are currently | |
2478 | processing. */ | |
2479 | int current_arg; | |
2480 | ||
2481 | /* An array whose size is the number of template parameters. The | |
838dfd8a | 2482 | elements are nonzero if the parameter has been used in any one |
6c30752f | 2483 | of the arguments processed so far. */ |
050367a3 | 2484 | int* parms; |
6c30752f MM |
2485 | |
2486 | /* An array whose size is the number of template arguments. The | |
838dfd8a | 2487 | elements are nonzero if the argument makes use of template |
6c30752f MM |
2488 | parameters of this level. */ |
2489 | int* arg_uses_template_parms; | |
050367a3 MM |
2490 | }; |
2491 | ||
2492 | /* Subroutine of push_template_decl used to see if each template | |
2493 | parameter in a partial specialization is used in the explicit | |
2494 | argument list. If T is of the LEVEL given in DATA (which is | |
2495 | treated as a template_parm_data*), then DATA->PARMS is marked | |
2496 | appropriately. */ | |
2497 | ||
2498 | static int | |
3a978d72 | 2499 | mark_template_parm (tree t, void* data) |
050367a3 MM |
2500 | { |
2501 | int level; | |
2502 | int idx; | |
2503 | struct template_parm_data* tpd = (struct template_parm_data*) data; | |
2504 | ||
2505 | if (TREE_CODE (t) == TEMPLATE_PARM_INDEX) | |
2506 | { | |
2507 | level = TEMPLATE_PARM_LEVEL (t); | |
2508 | idx = TEMPLATE_PARM_IDX (t); | |
2509 | } | |
2510 | else | |
2511 | { | |
2512 | level = TEMPLATE_TYPE_LEVEL (t); | |
2513 | idx = TEMPLATE_TYPE_IDX (t); | |
2514 | } | |
2515 | ||
2516 | if (level == tpd->level) | |
6c30752f MM |
2517 | { |
2518 | tpd->parms[idx] = 1; | |
2519 | tpd->arg_uses_template_parms[tpd->current_arg] = 1; | |
2520 | } | |
050367a3 MM |
2521 | |
2522 | /* Return zero so that for_each_template_parm will continue the | |
2523 | traversal of the tree; we want to mark *every* template parm. */ | |
2524 | return 0; | |
2525 | } | |
2526 | ||
6c30752f MM |
2527 | /* Process the partial specialization DECL. */ |
2528 | ||
e9659ab0 | 2529 | static tree |
3a978d72 | 2530 | process_partial_specialization (tree decl) |
6c30752f MM |
2531 | { |
2532 | tree type = TREE_TYPE (decl); | |
2533 | tree maintmpl = CLASSTYPE_TI_TEMPLATE (type); | |
2534 | tree specargs = CLASSTYPE_TI_ARGS (type); | |
f9a7ae04 | 2535 | tree inner_args = INNERMOST_TEMPLATE_ARGS (specargs); |
6c30752f MM |
2536 | tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms); |
2537 | tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl); | |
2538 | int nargs = TREE_VEC_LENGTH (inner_args); | |
2539 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2540 | int i; | |
2541 | int did_error_intro = 0; | |
6c30752f MM |
2542 | struct template_parm_data tpd; |
2543 | struct template_parm_data tpd2; | |
2544 | ||
6c30752f MM |
2545 | /* We check that each of the template parameters given in the |
2546 | partial specialization is used in the argument list to the | |
2547 | specialization. For example: | |
2548 | ||
2549 | template <class T> struct S; | |
2550 | template <class T> struct S<T*>; | |
2551 | ||
2552 | The second declaration is OK because `T*' uses the template | |
2553 | parameter T, whereas | |
2554 | ||
2555 | template <class T> struct S<int>; | |
2556 | ||
2557 | is no good. Even trickier is: | |
2558 | ||
2559 | template <class T> | |
2560 | struct S1 | |
2561 | { | |
2562 | template <class U> | |
2563 | struct S2; | |
2564 | template <class U> | |
2565 | struct S2<T>; | |
2566 | }; | |
2567 | ||
0e339752 | 2568 | The S2<T> declaration is actually invalid; it is a |
6c30752f MM |
2569 | full-specialization. Of course, |
2570 | ||
2571 | template <class U> | |
2572 | struct S2<T (*)(U)>; | |
2573 | ||
2574 | or some such would have been OK. */ | |
2575 | tpd.level = TMPL_PARMS_DEPTH (current_template_parms); | |
2576 | tpd.parms = alloca (sizeof (int) * ntparms); | |
fad205ff | 2577 | memset (tpd.parms, 0, sizeof (int) * ntparms); |
6c30752f MM |
2578 | |
2579 | tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs); | |
fad205ff | 2580 | memset (tpd.arg_uses_template_parms, 0, sizeof (int) * nargs); |
6c30752f MM |
2581 | for (i = 0; i < nargs; ++i) |
2582 | { | |
2583 | tpd.current_arg = i; | |
2584 | for_each_template_parm (TREE_VEC_ELT (inner_args, i), | |
2585 | &mark_template_parm, | |
4f2c9d7e MM |
2586 | &tpd, |
2587 | NULL); | |
6c30752f MM |
2588 | } |
2589 | for (i = 0; i < ntparms; ++i) | |
2590 | if (tpd.parms[i] == 0) | |
2591 | { | |
2592 | /* One of the template parms was not used in the | |
f9a7ae04 | 2593 | specialization. */ |
6c30752f MM |
2594 | if (!did_error_intro) |
2595 | { | |
33bd39a2 | 2596 | error ("template parameters not used in partial specialization:"); |
6c30752f MM |
2597 | did_error_intro = 1; |
2598 | } | |
2599 | ||
0f51ccfc | 2600 | error (" %qD", TREE_VALUE (TREE_VEC_ELT (inner_parms, i))); |
6c30752f MM |
2601 | } |
2602 | ||
2603 | /* [temp.class.spec] | |
2604 | ||
2605 | The argument list of the specialization shall not be identical to | |
2606 | the implicit argument list of the primary template. */ | |
f9a7ae04 MM |
2607 | if (comp_template_args |
2608 | (inner_args, | |
2609 | INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE | |
2610 | (maintmpl))))) | |
0f51ccfc | 2611 | error ("partial specialization %qT does not specialize any template arguments", type); |
6c30752f MM |
2612 | |
2613 | /* [temp.class.spec] | |
2614 | ||
2615 | A partially specialized non-type argument expression shall not | |
2616 | involve template parameters of the partial specialization except | |
2617 | when the argument expression is a simple identifier. | |
2618 | ||
2619 | The type of a template parameter corresponding to a specialized | |
2620 | non-type argument shall not be dependent on a parameter of the | |
2621 | specialization. */ | |
50bc768d | 2622 | gcc_assert (nargs == DECL_NTPARMS (maintmpl)); |
6c30752f MM |
2623 | tpd2.parms = 0; |
2624 | for (i = 0; i < nargs; ++i) | |
2625 | { | |
2626 | tree arg = TREE_VEC_ELT (inner_args, i); | |
2627 | if (/* These first two lines are the `non-type' bit. */ | |
2f939d94 | 2628 | !TYPE_P (arg) |
6c30752f MM |
2629 | && TREE_CODE (arg) != TEMPLATE_DECL |
2630 | /* This next line is the `argument expression is not just a | |
2631 | simple identifier' condition and also the `specialized | |
2632 | non-type argument' bit. */ | |
2633 | && TREE_CODE (arg) != TEMPLATE_PARM_INDEX) | |
2634 | { | |
2635 | if (tpd.arg_uses_template_parms[i]) | |
0f51ccfc | 2636 | error ("template argument %qE involves template parameter(s)", arg); |
6c30752f MM |
2637 | else |
2638 | { | |
2639 | /* Look at the corresponding template parameter, | |
2640 | marking which template parameters its type depends | |
2641 | upon. */ | |
2642 | tree type = | |
2643 | TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms, | |
2644 | i))); | |
2645 | ||
2646 | if (!tpd2.parms) | |
2647 | { | |
2648 | /* We haven't yet initialized TPD2. Do so now. */ | |
2649 | tpd2.arg_uses_template_parms | |
c68b0a84 | 2650 | = alloca (sizeof (int) * nargs); |
104bf76a | 2651 | /* The number of parameters here is the number in the |
76a83782 RH |
2652 | main template, which, as checked in the assertion |
2653 | above, is NARGS. */ | |
c68b0a84 | 2654 | tpd2.parms = alloca (sizeof (int) * nargs); |
6c30752f MM |
2655 | tpd2.level = |
2656 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl)); | |
2657 | } | |
2658 | ||
104bf76a | 2659 | /* Mark the template parameters. But this time, we're |
6c30752f MM |
2660 | looking for the template parameters of the main |
2661 | template, not in the specialization. */ | |
2662 | tpd2.current_arg = i; | |
2663 | tpd2.arg_uses_template_parms[i] = 0; | |
fad205ff | 2664 | memset (tpd2.parms, 0, sizeof (int) * nargs); |
6c30752f MM |
2665 | for_each_template_parm (type, |
2666 | &mark_template_parm, | |
4f2c9d7e MM |
2667 | &tpd2, |
2668 | NULL); | |
6c30752f MM |
2669 | |
2670 | if (tpd2.arg_uses_template_parms [i]) | |
2671 | { | |
2672 | /* The type depended on some template parameters. | |
2673 | If they are fully specialized in the | |
2674 | specialization, that's OK. */ | |
2675 | int j; | |
2676 | for (j = 0; j < nargs; ++j) | |
2677 | if (tpd2.parms[j] != 0 | |
2678 | && tpd.arg_uses_template_parms [j]) | |
2679 | { | |
0f51ccfc GDR |
2680 | error ("type %qT of template argument %qE depends " |
2681 | "on template parameter(s)", | |
2682 | type, | |
2683 | arg); | |
6c30752f MM |
2684 | break; |
2685 | } | |
2686 | } | |
2687 | } | |
2688 | } | |
2689 | } | |
2690 | ||
c7222c02 MM |
2691 | if (retrieve_specialization (maintmpl, specargs, |
2692 | /*class_specializations_p=*/true)) | |
6c30752f MM |
2693 | /* We've already got this specialization. */ |
2694 | return decl; | |
2695 | ||
d8b64f80 | 2696 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl) |
e1b3e07d MM |
2697 | = tree_cons (inner_args, inner_parms, |
2698 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)); | |
6c30752f MM |
2699 | TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type; |
2700 | return decl; | |
2701 | } | |
2702 | ||
6ba89f8e MM |
2703 | /* Check that a template declaration's use of default arguments is not |
2704 | invalid. Here, PARMS are the template parameters. IS_PRIMARY is | |
838dfd8a KH |
2705 | nonzero if DECL is the thing declared by a primary template. |
2706 | IS_PARTIAL is nonzero if DECL is a partial specialization. */ | |
6ba89f8e MM |
2707 | |
2708 | static void | |
3a978d72 | 2709 | check_default_tmpl_args (tree decl, tree parms, int is_primary, int is_partial) |
6ba89f8e | 2710 | { |
d8e178a0 | 2711 | const char *msg; |
66191c20 MM |
2712 | int last_level_to_check; |
2713 | tree parm_level; | |
6ba89f8e MM |
2714 | |
2715 | /* [temp.param] | |
2716 | ||
2717 | A default template-argument shall not be specified in a | |
2718 | function template declaration or a function template definition, nor | |
2719 | in the template-parameter-list of the definition of a member of a | |
2720 | class template. */ | |
2721 | ||
4f1c5b7d | 2722 | if (TREE_CODE (CP_DECL_CONTEXT (decl)) == FUNCTION_DECL) |
e0942dcd MM |
2723 | /* You can't have a function template declaration in a local |
2724 | scope, nor you can you define a member of a class template in a | |
2725 | local scope. */ | |
2726 | return; | |
2727 | ||
6ba89f8e MM |
2728 | if (current_class_type |
2729 | && !TYPE_BEING_DEFINED (current_class_type) | |
3d7de1fa | 2730 | && DECL_LANG_SPECIFIC (decl) |
5937a6f9 MM |
2731 | /* If this is either a friend defined in the scope of the class |
2732 | or a member function. */ | |
6df5158a NS |
2733 | && (DECL_FUNCTION_MEMBER_P (decl) |
2734 | ? same_type_p (DECL_CONTEXT (decl), current_class_type) | |
2735 | : DECL_FRIEND_CONTEXT (decl) | |
2736 | ? same_type_p (DECL_FRIEND_CONTEXT (decl), current_class_type) | |
2737 | : false) | |
5937a6f9 MM |
2738 | /* And, if it was a member function, it really was defined in |
2739 | the scope of the class. */ | |
6df5158a NS |
2740 | && (!DECL_FUNCTION_MEMBER_P (decl) |
2741 | || DECL_INITIALIZED_IN_CLASS_P (decl))) | |
6ba89f8e | 2742 | /* We already checked these parameters when the template was |
5937a6f9 MM |
2743 | declared, so there's no need to do it again now. This function |
2744 | was defined in class scope, but we're processing it's body now | |
2745 | that the class is complete. */ | |
6ba89f8e MM |
2746 | return; |
2747 | ||
66191c20 MM |
2748 | /* [temp.param] |
2749 | ||
2750 | If a template-parameter has a default template-argument, all | |
2751 | subsequent template-parameters shall have a default | |
2752 | template-argument supplied. */ | |
2753 | for (parm_level = parms; parm_level; parm_level = TREE_CHAIN (parm_level)) | |
2754 | { | |
2755 | tree inner_parms = TREE_VALUE (parm_level); | |
2756 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2757 | int seen_def_arg_p = 0; | |
2758 | int i; | |
2759 | ||
2760 | for (i = 0; i < ntparms; ++i) | |
2761 | { | |
2762 | tree parm = TREE_VEC_ELT (inner_parms, i); | |
2763 | if (TREE_PURPOSE (parm)) | |
2764 | seen_def_arg_p = 1; | |
2765 | else if (seen_def_arg_p) | |
2766 | { | |
0f51ccfc | 2767 | error ("no default argument for %qD", TREE_VALUE (parm)); |
66191c20 MM |
2768 | /* For better subsequent error-recovery, we indicate that |
2769 | there should have been a default argument. */ | |
2770 | TREE_PURPOSE (parm) = error_mark_node; | |
2771 | } | |
2772 | } | |
2773 | } | |
2774 | ||
6ba89f8e MM |
2775 | if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary) |
2776 | /* For an ordinary class template, default template arguments are | |
2777 | allowed at the innermost level, e.g.: | |
2778 | template <class T = int> | |
2779 | struct S {}; | |
2780 | but, in a partial specialization, they're not allowed even | |
2781 | there, as we have in [temp.class.spec]: | |
2782 | ||
2783 | The template parameter list of a specialization shall not | |
2784 | contain default template argument values. | |
2785 | ||
2786 | So, for a partial specialization, or for a function template, | |
2787 | we look at all of them. */ | |
2788 | ; | |
2789 | else | |
2790 | /* But, for a primary class template that is not a partial | |
2791 | specialization we look at all template parameters except the | |
2792 | innermost ones. */ | |
2793 | parms = TREE_CHAIN (parms); | |
2794 | ||
2795 | /* Figure out what error message to issue. */ | |
2796 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
8653a2c3 | 2797 | msg = "default template arguments may not be used in function templates"; |
6ba89f8e | 2798 | else if (is_partial) |
8653a2c3 | 2799 | msg = "default template arguments may not be used in partial specializations"; |
6ba89f8e | 2800 | else |
0f51ccfc | 2801 | msg = "default argument for template parameter for class enclosing %qD"; |
6ba89f8e MM |
2802 | |
2803 | if (current_class_type && TYPE_BEING_DEFINED (current_class_type)) | |
2804 | /* If we're inside a class definition, there's no need to | |
104bf76a | 2805 | examine the parameters to the class itself. On the one |
6ba89f8e | 2806 | hand, they will be checked when the class is defined, and, |
0e339752 | 2807 | on the other, default arguments are valid in things like: |
6ba89f8e MM |
2808 | template <class T = double> |
2809 | struct S { template <class U> void f(U); }; | |
2810 | Here the default argument for `S' has no bearing on the | |
2811 | declaration of `f'. */ | |
2812 | last_level_to_check = template_class_depth (current_class_type) + 1; | |
2813 | else | |
2814 | /* Check everything. */ | |
2815 | last_level_to_check = 0; | |
2816 | ||
66191c20 MM |
2817 | for (parm_level = parms; |
2818 | parm_level && TMPL_PARMS_DEPTH (parm_level) >= last_level_to_check; | |
2819 | parm_level = TREE_CHAIN (parm_level)) | |
6ba89f8e | 2820 | { |
66191c20 MM |
2821 | tree inner_parms = TREE_VALUE (parm_level); |
2822 | int i; | |
2823 | int ntparms; | |
6ba89f8e MM |
2824 | |
2825 | ntparms = TREE_VEC_LENGTH (inner_parms); | |
2826 | for (i = 0; i < ntparms; ++i) | |
2827 | if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i))) | |
2828 | { | |
2829 | if (msg) | |
2830 | { | |
33bd39a2 | 2831 | error (msg, decl); |
6ba89f8e MM |
2832 | msg = 0; |
2833 | } | |
2834 | ||
2835 | /* Clear out the default argument so that we are not | |
2836 | confused later. */ | |
2837 | TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE; | |
2838 | } | |
2839 | ||
2840 | /* At this point, if we're still interested in issuing messages, | |
2841 | they must apply to classes surrounding the object declared. */ | |
2842 | if (msg) | |
0f51ccfc | 2843 | msg = "default argument for template parameter for class enclosing %qD"; |
6ba89f8e MM |
2844 | } |
2845 | } | |
2846 | ||
5dd236e2 NS |
2847 | /* Worker for push_template_decl_real, called via |
2848 | for_each_template_parm. DATA is really an int, indicating the | |
2849 | level of the parameters we are interested in. If T is a template | |
838dfd8a | 2850 | parameter of that level, return nonzero. */ |
5dd236e2 NS |
2851 | |
2852 | static int | |
3a978d72 | 2853 | template_parm_this_level_p (tree t, void* data) |
5dd236e2 | 2854 | { |
6e04241f | 2855 | int this_level = *(int *)data; |
5dd236e2 NS |
2856 | int level; |
2857 | ||
2858 | if (TREE_CODE (t) == TEMPLATE_PARM_INDEX) | |
2859 | level = TEMPLATE_PARM_LEVEL (t); | |
2860 | else | |
2861 | level = TEMPLATE_TYPE_LEVEL (t); | |
2862 | return level == this_level; | |
2863 | } | |
2864 | ||
3ac3d9ea | 2865 | /* Creates a TEMPLATE_DECL for the indicated DECL using the template |
f84b4be9 JM |
2866 | parameters given by current_template_args, or reuses a |
2867 | previously existing one, if appropriate. Returns the DECL, or an | |
6757edfe MM |
2868 | equivalent one, if it is replaced via a call to duplicate_decls. |
2869 | ||
838dfd8a | 2870 | If IS_FRIEND is nonzero, DECL is a friend declaration. */ |
3ac3d9ea MM |
2871 | |
2872 | tree | |
3a978d72 | 2873 | push_template_decl_real (tree decl, int is_friend) |
9a3b49ac MS |
2874 | { |
2875 | tree tmpl; | |
f84b4be9 | 2876 | tree args; |
9a3b49ac | 2877 | tree info; |
f84b4be9 JM |
2878 | tree ctx; |
2879 | int primary; | |
6ba89f8e | 2880 | int is_partial; |
cfe507be | 2881 | int new_template_p = 0; |
c7222c02 MM |
2882 | /* True if the template is a member template, in the sense of |
2883 | [temp.mem]. */ | |
2884 | bool member_template_p = false; | |
6ba89f8e | 2885 | |
c0694c4b MM |
2886 | if (decl == error_mark_node) |
2887 | return decl; | |
2888 | ||
6ba89f8e | 2889 | /* See if this is a partial specialization. */ |
9188c363 | 2890 | is_partial = (DECL_IMPLICIT_TYPEDEF_P (decl) |
6ba89f8e | 2891 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE |
370af2d5 | 2892 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl))); |
6757edfe MM |
2893 | |
2894 | is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl)); | |
f84b4be9 JM |
2895 | |
2896 | if (is_friend) | |
2897 | /* For a friend, we want the context of the friend function, not | |
2898 | the type of which it is a friend. */ | |
2899 | ctx = DECL_CONTEXT (decl); | |
4f1c5b7d MM |
2900 | else if (CP_DECL_CONTEXT (decl) |
2901 | && TREE_CODE (CP_DECL_CONTEXT (decl)) != NAMESPACE_DECL) | |
f84b4be9 JM |
2902 | /* In the case of a virtual function, we want the class in which |
2903 | it is defined. */ | |
4f1c5b7d | 2904 | ctx = CP_DECL_CONTEXT (decl); |
f84b4be9 | 2905 | else |
dc957d14 | 2906 | /* Otherwise, if we're currently defining some class, the DECL |
f84b4be9 | 2907 | is assumed to be a member of the class. */ |
9188c363 | 2908 | ctx = current_scope (); |
f84b4be9 | 2909 | |
2c73f9f5 ML |
2910 | if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL) |
2911 | ctx = NULL_TREE; | |
2912 | ||
2913 | if (!DECL_CONTEXT (decl)) | |
cb0dbb9a | 2914 | DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace); |
2c73f9f5 | 2915 | |
6ba89f8e | 2916 | /* See if this is a primary template. */ |
74b846e0 | 2917 | primary = template_parm_scope_p (); |
9a3b49ac | 2918 | |
83566abf JM |
2919 | if (primary) |
2920 | { | |
c7222c02 MM |
2921 | if (DECL_CLASS_SCOPE_P (decl)) |
2922 | member_template_p = true; | |
83566abf | 2923 | if (current_lang_name == lang_name_c) |
33bd39a2 | 2924 | error ("template with C linkage"); |
4ce3d537 MM |
2925 | else if (TREE_CODE (decl) == TYPE_DECL |
2926 | && ANON_AGGRNAME_P (DECL_NAME (decl))) | |
33bd39a2 | 2927 | error ("template class without a name"); |
717a7d5d | 2928 | else if (TREE_CODE (decl) == FUNCTION_DECL) |
4b0d3cbe | 2929 | { |
717a7d5d MM |
2930 | if (DECL_DESTRUCTOR_P (decl)) |
2931 | { | |
2932 | /* [temp.mem] | |
2933 | ||
2934 | A destructor shall not be a member template. */ | |
0f51ccfc | 2935 | error ("destructor %qD declared as member template", decl); |
717a7d5d MM |
2936 | return error_mark_node; |
2937 | } | |
2938 | if (NEW_DELETE_OPNAME_P (DECL_NAME (decl)) | |
2939 | && (!TYPE_ARG_TYPES (TREE_TYPE (decl)) | |
2940 | || TYPE_ARG_TYPES (TREE_TYPE (decl)) == void_list_node | |
2941 | || !TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl))) | |
2942 | || (TREE_CHAIN (TYPE_ARG_TYPES ((TREE_TYPE (decl)))) | |
2943 | == void_list_node))) | |
2944 | { | |
2945 | /* [basic.stc.dynamic.allocation] | |
2946 | ||
2947 | An allocation function can be a function | |
2948 | template. ... Template allocation functions shall | |
2949 | have two or more parameters. */ | |
0f51ccfc | 2950 | error ("invalid template declaration of %qD", decl); |
717a7d5d MM |
2951 | return decl; |
2952 | } | |
4b0d3cbe | 2953 | } |
2aaf816d JM |
2954 | else if ((DECL_IMPLICIT_TYPEDEF_P (decl) |
2955 | && CLASS_TYPE_P (TREE_TYPE (decl))) | |
717a7d5d | 2956 | || (TREE_CODE (decl) == VAR_DECL && ctx && CLASS_TYPE_P (ctx))) |
2aaf816d JM |
2957 | /* OK */; |
2958 | else | |
11325dcd | 2959 | { |
0f51ccfc | 2960 | error ("template declaration of %q#D", decl); |
11325dcd KL |
2961 | return error_mark_node; |
2962 | } | |
83566abf JM |
2963 | } |
2964 | ||
6ba89f8e MM |
2965 | /* Check to see that the rules regarding the use of default |
2966 | arguments are not being violated. */ | |
2967 | check_default_tmpl_args (decl, current_template_parms, | |
2968 | primary, is_partial); | |
73aad9b9 | 2969 | |
6ba89f8e MM |
2970 | if (is_partial) |
2971 | return process_partial_specialization (decl); | |
d32789d8 | 2972 | |
9a3b49ac MS |
2973 | args = current_template_args (); |
2974 | ||
f84b4be9 JM |
2975 | if (!ctx |
2976 | || TREE_CODE (ctx) == FUNCTION_DECL | |
a723baf1 | 2977 | || (CLASS_TYPE_P (ctx) && TYPE_BEING_DEFINED (ctx)) |
f84b4be9 | 2978 | || (is_friend && !DECL_TEMPLATE_INFO (decl))) |
8d08fdba | 2979 | { |
75650646 | 2980 | if (DECL_LANG_SPECIFIC (decl) |
f84b4be9 JM |
2981 | && DECL_TEMPLATE_INFO (decl) |
2982 | && DECL_TI_TEMPLATE (decl)) | |
2983 | tmpl = DECL_TI_TEMPLATE (decl); | |
1c10870d AS |
2984 | /* If DECL is a TYPE_DECL for a class-template, then there won't |
2985 | be DECL_LANG_SPECIFIC. The information equivalent to | |
2986 | DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */ | |
2987 | else if (DECL_IMPLICIT_TYPEDEF_P (decl) | |
2988 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2989 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2990 | { | |
2991 | /* Since a template declaration already existed for this | |
2992 | class-type, we must be redeclaring it here. Make sure | |
0e339752 | 2993 | that the redeclaration is valid. */ |
1c10870d AS |
2994 | redeclare_class_template (TREE_TYPE (decl), |
2995 | current_template_parms); | |
2996 | /* We don't need to create a new TEMPLATE_DECL; just use the | |
2997 | one we already had. */ | |
2998 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
2999 | } | |
f84b4be9 | 3000 | else |
786b5245 | 3001 | { |
c7222c02 MM |
3002 | tmpl = build_template_decl (decl, current_template_parms, |
3003 | member_template_p); | |
cfe507be MM |
3004 | new_template_p = 1; |
3005 | ||
f84b4be9 JM |
3006 | if (DECL_LANG_SPECIFIC (decl) |
3007 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
3008 | { | |
3009 | /* A specialization of a member template of a template | |
c6002625 | 3010 | class. */ |
f84b4be9 JM |
3011 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); |
3012 | DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl); | |
3013 | DECL_TEMPLATE_INFO (decl) = NULL_TREE; | |
3014 | } | |
786b5245 | 3015 | } |
8d08fdba MS |
3016 | } |
3017 | else | |
3018 | { | |
e1a5ccf7 | 3019 | tree a, t, current, parms; |
ba4f4e5d | 3020 | int i; |
6633d636 | 3021 | |
6b9ab5cc MM |
3022 | if (TREE_CODE (decl) == TYPE_DECL) |
3023 | { | |
ed44da02 MM |
3024 | if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl))) |
3025 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
3026 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
3027 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
3028 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
6b9ab5cc MM |
3029 | else |
3030 | { | |
0f51ccfc | 3031 | error ("%qD does not declare a template type", decl); |
6b9ab5cc MM |
3032 | return decl; |
3033 | } | |
3034 | } | |
f3368a90 | 3035 | else if (!DECL_LANG_SPECIFIC (decl) || !DECL_TEMPLATE_INFO (decl)) |
c91a56d2 | 3036 | { |
0f51ccfc | 3037 | error ("template definition of non-template %q#D", decl); |
3ac3d9ea | 3038 | return decl; |
c91a56d2 | 3039 | } |
8d08fdba | 3040 | else |
5566b478 | 3041 | tmpl = DECL_TI_TEMPLATE (decl); |
98c1c668 | 3042 | |
c353b8e3 | 3043 | if (DECL_FUNCTION_TEMPLATE_P (tmpl) |
e1a5ccf7 | 3044 | && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl) |
c353b8e3 | 3045 | && DECL_TEMPLATE_SPECIALIZATION (decl) |
c7222c02 | 3046 | && DECL_MEMBER_TEMPLATE_P (tmpl)) |
98c1c668 | 3047 | { |
e1a5ccf7 JM |
3048 | tree new_tmpl; |
3049 | ||
3050 | /* The declaration is a specialization of a member | |
3051 | template, declared outside the class. Therefore, the | |
3052 | innermost template arguments will be NULL, so we | |
3053 | replace them with the arguments determined by the | |
3054 | earlier call to check_explicit_specialization. */ | |
3055 | args = DECL_TI_ARGS (decl); | |
3056 | ||
3057 | new_tmpl | |
c7222c02 MM |
3058 | = build_template_decl (decl, current_template_parms, |
3059 | member_template_p); | |
e1a5ccf7 JM |
3060 | DECL_TEMPLATE_RESULT (new_tmpl) = decl; |
3061 | TREE_TYPE (new_tmpl) = TREE_TYPE (decl); | |
3062 | DECL_TI_TEMPLATE (decl) = new_tmpl; | |
3063 | SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl); | |
e1b3e07d MM |
3064 | DECL_TEMPLATE_INFO (new_tmpl) |
3065 | = tree_cons (tmpl, args, NULL_TREE); | |
e1a5ccf7 | 3066 | |
f9a7ae04 MM |
3067 | register_specialization (new_tmpl, |
3068 | most_general_template (tmpl), | |
3069 | args); | |
e1a5ccf7 | 3070 | return decl; |
98c1c668 | 3071 | } |
98c1c668 | 3072 | |
e1a5ccf7 | 3073 | /* Make sure the template headers we got make sense. */ |
6633d636 | 3074 | |
e1a5ccf7 JM |
3075 | parms = DECL_TEMPLATE_PARMS (tmpl); |
3076 | i = TMPL_PARMS_DEPTH (parms); | |
3077 | if (TMPL_ARGS_DEPTH (args) != i) | |
98c1c668 | 3078 | { |
0f51ccfc GDR |
3079 | error ("expected %d levels of template parms for %q#D, got %d", |
3080 | i, decl, TMPL_ARGS_DEPTH (args)); | |
98c1c668 | 3081 | } |
e1a5ccf7 JM |
3082 | else |
3083 | for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms)) | |
3084 | { | |
3085 | a = TMPL_ARGS_LEVEL (args, i); | |
3086 | t = INNERMOST_TEMPLATE_PARMS (parms); | |
3087 | ||
3088 | if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a)) | |
3089 | { | |
3090 | if (current == decl) | |
0f51ccfc GDR |
3091 | error ("got %d template parameters for %q#D", |
3092 | TREE_VEC_LENGTH (a), decl); | |
e1a5ccf7 | 3093 | else |
0f51ccfc GDR |
3094 | error ("got %d template parameters for %q#T", |
3095 | TREE_VEC_LENGTH (a), current); | |
33bd39a2 | 3096 | error (" but %d required", TREE_VEC_LENGTH (t)); |
e1a5ccf7 | 3097 | } |
98c1c668 | 3098 | |
e1a5ccf7 JM |
3099 | /* Perhaps we should also check that the parms are used in the |
3100 | appropriate qualifying scopes in the declarator? */ | |
6633d636 | 3101 | |
e1a5ccf7 JM |
3102 | if (current == decl) |
3103 | current = ctx; | |
3104 | else | |
3105 | current = TYPE_CONTEXT (current); | |
3106 | } | |
5566b478 | 3107 | } |
8d08fdba | 3108 | |
5566b478 MS |
3109 | DECL_TEMPLATE_RESULT (tmpl) = decl; |
3110 | TREE_TYPE (tmpl) = TREE_TYPE (decl); | |
8d08fdba | 3111 | |
36a117a5 MM |
3112 | /* Push template declarations for global functions and types. Note |
3113 | that we do not try to push a global template friend declared in a | |
3114 | template class; such a thing may well depend on the template | |
39c01e4c | 3115 | parameters of the class. */ |
cfe507be | 3116 | if (new_template_p && !ctx |
36a117a5 | 3117 | && !(is_friend && template_class_depth (current_class_type) > 0)) |
c6f9f83b KL |
3118 | { |
3119 | tmpl = pushdecl_namespace_level (tmpl); | |
3120 | if (tmpl == error_mark_node) | |
3121 | return error_mark_node; | |
3122 | } | |
8d08fdba | 3123 | |
5566b478 | 3124 | if (primary) |
5dd236e2 NS |
3125 | { |
3126 | DECL_PRIMARY_TEMPLATE (tmpl) = tmpl; | |
3127 | if (DECL_CONV_FN_P (tmpl)) | |
3128 | { | |
6e04241f GS |
3129 | int depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)); |
3130 | ||
5dd236e2 NS |
3131 | /* It is a conversion operator. See if the type converted to |
3132 | depends on innermost template operands. */ | |
3133 | ||
d43f603d KL |
3134 | if (uses_template_parms_level (TREE_TYPE (TREE_TYPE (tmpl)), |
3135 | depth)) | |
5dd236e2 NS |
3136 | DECL_TEMPLATE_CONV_FN_P (tmpl) = 1; |
3137 | } | |
3138 | } | |
5566b478 | 3139 | |
a692ad2e | 3140 | /* The DECL_TI_ARGS of DECL contains full set of arguments referring |
28ba38e3 KL |
3141 | back to its most general template. If TMPL is a specialization, |
3142 | ARGS may only have the innermost set of arguments. Add the missing | |
3143 | argument levels if necessary. */ | |
3144 | if (DECL_TEMPLATE_INFO (tmpl)) | |
3145 | args = add_outermost_template_args (DECL_TI_ARGS (tmpl), args); | |
3146 | ||
e1b3e07d | 3147 | info = tree_cons (tmpl, args, NULL_TREE); |
5566b478 | 3148 | |
9188c363 | 3149 | if (DECL_IMPLICIT_TYPEDEF_P (decl)) |
8d08fdba | 3150 | { |
ed44da02 MM |
3151 | SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info); |
3152 | if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL) | |
b60ecc04 MM |
3153 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE |
3154 | /* Don't change the name if we've already set it up. */ | |
3155 | && !IDENTIFIER_TEMPLATE (DECL_NAME (decl))) | |
75650646 | 3156 | DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl)); |
51c184be | 3157 | } |
2aaf816d | 3158 | else if (DECL_LANG_SPECIFIC (decl)) |
5566b478 | 3159 | DECL_TEMPLATE_INFO (decl) = info; |
3ac3d9ea MM |
3160 | |
3161 | return DECL_TEMPLATE_RESULT (tmpl); | |
8d08fdba MS |
3162 | } |
3163 | ||
6757edfe | 3164 | tree |
3a978d72 | 3165 | push_template_decl (tree decl) |
6757edfe MM |
3166 | { |
3167 | return push_template_decl_real (decl, 0); | |
3168 | } | |
3169 | ||
3170 | /* Called when a class template TYPE is redeclared with the indicated | |
3171 | template PARMS, e.g.: | |
7fe6899f MM |
3172 | |
3173 | template <class T> struct S; | |
3174 | template <class T> struct S {}; */ | |
3175 | ||
3176 | void | |
3a978d72 | 3177 | redeclare_class_template (tree type, tree parms) |
7fe6899f | 3178 | { |
3d7de1fa | 3179 | tree tmpl; |
6757edfe | 3180 | tree tmpl_parms; |
7fe6899f MM |
3181 | int i; |
3182 | ||
3d7de1fa MM |
3183 | if (!TYPE_TEMPLATE_INFO (type)) |
3184 | { | |
0f51ccfc | 3185 | error ("%qT is not a template type", type); |
3d7de1fa MM |
3186 | return; |
3187 | } | |
3188 | ||
3189 | tmpl = TYPE_TI_TEMPLATE (type); | |
7fe6899f MM |
3190 | if (!PRIMARY_TEMPLATE_P (tmpl)) |
3191 | /* The type is nested in some template class. Nothing to worry | |
3192 | about here; there are no new template parameters for the nested | |
3193 | type. */ | |
3194 | return; | |
3195 | ||
ee921ddf MM |
3196 | if (!parms) |
3197 | { | |
3198 | error ("template specifiers not specified in declaration of %qD", | |
3199 | tmpl); | |
3200 | return; | |
3201 | } | |
3202 | ||
6757edfe MM |
3203 | parms = INNERMOST_TEMPLATE_PARMS (parms); |
3204 | tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl); | |
3205 | ||
7fe6899f MM |
3206 | if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms)) |
3207 | { | |
0f51ccfc | 3208 | cp_error_at ("previous declaration %qD", tmpl); |
33bd39a2 | 3209 | error ("used %d template parameter%s instead of %d", |
7fe6899f MM |
3210 | TREE_VEC_LENGTH (tmpl_parms), |
3211 | TREE_VEC_LENGTH (tmpl_parms) == 1 ? "" : "s", | |
3212 | TREE_VEC_LENGTH (parms)); | |
3213 | return; | |
3214 | } | |
3215 | ||
3216 | for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i) | |
3217 | { | |
3218 | tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i)); | |
3219 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); | |
3220 | tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)); | |
3221 | tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i)); | |
3222 | ||
2649701f KL |
3223 | /* TMPL_PARM and PARM can be either TYPE_DECL, PARM_DECL, or |
3224 | TEMPLATE_DECL. */ | |
3225 | if (TREE_CODE (tmpl_parm) != TREE_CODE (parm) | |
3226 | || (TREE_CODE (tmpl_parm) != TYPE_DECL | |
3227 | && !same_type_p (TREE_TYPE (tmpl_parm), TREE_TYPE (parm)))) | |
7fe6899f | 3228 | { |
0f51ccfc GDR |
3229 | cp_error_at ("template parameter %q#D", tmpl_parm); |
3230 | error ("redeclared here as %q#D", parm); | |
7fe6899f MM |
3231 | return; |
3232 | } | |
3233 | ||
3234 | if (tmpl_default != NULL_TREE && parm_default != NULL_TREE) | |
3235 | { | |
3236 | /* We have in [temp.param]: | |
3237 | ||
3238 | A template-parameter may not be given default arguments | |
3239 | by two different declarations in the same scope. */ | |
0f51ccfc | 3240 | error ("redefinition of default argument for %q#D", parm); |
ddd2d57e | 3241 | error ("%J original definition appeared here", tmpl_parm); |
7fe6899f MM |
3242 | return; |
3243 | } | |
3244 | ||
3245 | if (parm_default != NULL_TREE) | |
3246 | /* Update the previous template parameters (which are the ones | |
3247 | that will really count) with the new default value. */ | |
3248 | TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default; | |
7ce74c5e MM |
3249 | else if (tmpl_default != NULL_TREE) |
3250 | /* Update the new parameters, too; they'll be used as the | |
3251 | parameters for any members. */ | |
3252 | TREE_PURPOSE (TREE_VEC_ELT (parms, i)) = tmpl_default; | |
7fe6899f MM |
3253 | } |
3254 | } | |
75650646 | 3255 | |
9baa27a9 MM |
3256 | /* Simplify EXPR if it is a non-dependent expression. Returns the |
3257 | (possibly simplified) expression. */ | |
3258 | ||
3259 | tree | |
3260 | fold_non_dependent_expr (tree expr) | |
3261 | { | |
3262 | /* If we're in a template, but EXPR isn't value dependent, simplify | |
3263 | it. We're supposed to treat: | |
3264 | ||
3265 | template <typename T> void f(T[1 + 1]); | |
3266 | template <typename T> void f(T[2]); | |
3267 | ||
3268 | as two declarations of the same function, for example. */ | |
3269 | if (processing_template_decl | |
3270 | && !type_dependent_expression_p (expr) | |
3271 | && !value_dependent_expression_p (expr)) | |
3272 | { | |
3273 | HOST_WIDE_INT saved_processing_template_decl; | |
3274 | ||
3275 | saved_processing_template_decl = processing_template_decl; | |
3276 | processing_template_decl = 0; | |
3277 | expr = tsubst_copy_and_build (expr, | |
3278 | /*args=*/NULL_TREE, | |
3279 | tf_error, | |
3280 | /*in_decl=*/NULL_TREE, | |
3281 | /*function_p=*/false); | |
3282 | processing_template_decl = saved_processing_template_decl; | |
3283 | } | |
3284 | return expr; | |
3285 | } | |
3286 | ||
b6ab6892 GB |
3287 | /* EXPR is an expression which is used in a constant-expression context. |
3288 | For instance, it could be a VAR_DECL with a constant initializer. | |
3289 | Extract the innest constant expression. | |
3290 | ||
8a784e4a NS |
3291 | This is basically a more powerful version of |
3292 | integral_constant_value, which can be used also in templates where | |
3293 | initializers can maintain a syntactic rather than semantic form | |
3294 | (even if they are non-dependent, for access-checking purposes). */ | |
b6ab6892 GB |
3295 | |
3296 | tree | |
3297 | fold_decl_constant_value (tree expr) | |
3298 | { | |
4ef69b83 GB |
3299 | tree const_expr = expr; |
3300 | do | |
b6ab6892 | 3301 | { |
b6ab6892 | 3302 | expr = fold_non_dependent_expr (const_expr); |
4ef69b83 | 3303 | const_expr = integral_constant_value (expr); |
b6ab6892 | 3304 | } |
4ef69b83 | 3305 | while (expr != const_expr); |
b6ab6892 | 3306 | |
8a784e4a | 3307 | return expr; |
b6ab6892 GB |
3308 | } |
3309 | ||
3310 | /* Subroutine of convert_nontype_argument. Converts EXPR to TYPE, which | |
3311 | must be a function or a pointer-to-function type, as specified | |
3312 | in [temp.arg.nontype]: disambiguate EXPR if it is an overload set, | |
3313 | and check that the resulting function has external linkage. */ | |
3314 | ||
3315 | static tree | |
3316 | convert_nontype_argument_function (tree type, tree expr) | |
3317 | { | |
3318 | tree fns = expr; | |
3319 | tree fn, fn_no_ptr; | |
3320 | ||
3321 | fn = instantiate_type (type, fns, tf_none); | |
3322 | if (fn == error_mark_node) | |
3323 | return error_mark_node; | |
3324 | ||
3325 | fn_no_ptr = fn; | |
3326 | if (TREE_CODE (fn_no_ptr) == ADDR_EXPR) | |
3327 | fn_no_ptr = TREE_OPERAND (fn_no_ptr, 0); | |
3328 | ||
3329 | /* [temp.arg.nontype]/1 | |
3330 | ||
3331 | A template-argument for a non-type, non-template template-parameter | |
3332 | shall be one of: | |
3333 | [...] | |
3334 | -- the address of an object or function with external linkage. */ | |
3335 | if (!DECL_EXTERNAL_LINKAGE_P (fn_no_ptr)) | |
3336 | { | |
3337 | error ("%qE is not a valid template argument for type %qT " | |
3338 | "because function %qD has not external linkage", | |
3339 | expr, type, fn_no_ptr); | |
3340 | return NULL_TREE; | |
3341 | } | |
3342 | ||
3343 | return fn; | |
3344 | } | |
3345 | ||
75650646 MM |
3346 | /* Attempt to convert the non-type template parameter EXPR to the |
3347 | indicated TYPE. If the conversion is successful, return the | |
dc957d14 | 3348 | converted value. If the conversion is unsuccessful, return |
75650646 MM |
3349 | NULL_TREE if we issued an error message, or error_mark_node if we |
3350 | did not. We issue error messages for out-and-out bad template | |
3351 | parameters, but not simply because the conversion failed, since we | |
9baa27a9 | 3352 | might be just trying to do argument deduction. Both TYPE and EXPR |
b6ab6892 GB |
3353 | must be non-dependent. |
3354 | ||
3355 | The conversion follows the special rules described in | |
3356 | [temp.arg.nontype], and it is much more strict than an implicit | |
3357 | conversion. | |
3358 | ||
3359 | This function is called twice for each template argument (see | |
3360 | lookup_template_class for a more accurate description of this | |
3361 | problem). This means that we need to handle expressions which | |
3362 | are not valid in a C++ source, but can be created from the | |
3363 | first call (for instance, casts to perform conversions). These | |
3364 | hacks can go away after we fix the double coercion problem. */ | |
75650646 MM |
3365 | |
3366 | static tree | |
3a978d72 | 3367 | convert_nontype_argument (tree type, tree expr) |
75650646 | 3368 | { |
9baa27a9 MM |
3369 | tree expr_type; |
3370 | ||
b6ab6892 GB |
3371 | /* Detect immediately string literals as invalid non-type argument. |
3372 | This special-case is not needed for correctness (we would easily | |
3373 | catch this later), but only to provide better diagnostic for this | |
3374 | common user mistake. As suggested by DR 100, we do not mention | |
3375 | linkage issues in the diagnostic as this is not the point. */ | |
3376 | if (TREE_CODE (expr) == STRING_CST) | |
3377 | { | |
3378 | error ("%qE is not a valid template argument for type %qT " | |
3379 | "because string literals can never be used in this context", | |
3380 | expr, type); | |
3381 | return NULL_TREE; | |
3382 | } | |
3383 | ||
9baa27a9 MM |
3384 | /* If we are in a template, EXPR may be non-dependent, but still |
3385 | have a syntactic, rather than semantic, form. For example, EXPR | |
3386 | might be a SCOPE_REF, rather than the VAR_DECL to which the | |
3387 | SCOPE_REF refers. Preserving the qualifying scope is necessary | |
3388 | so that access checking can be performed when the template is | |
3389 | instantiated -- but here we need the resolved form so that we can | |
3390 | convert the argument. */ | |
3391 | expr = fold_non_dependent_expr (expr); | |
3392 | expr_type = TREE_TYPE (expr); | |
75650646 | 3393 | |
b6ab6892 GB |
3394 | /* HACK: Due to double coercion, we can get a |
3395 | NOP_EXPR<REFERENCE_TYPE>(ADDR_EXPR<POINTER_TYPE> (arg)) here, | |
3396 | which is the tree that we built on the first call (see | |
3397 | below when coercing to reference to object or to reference to | |
3398 | function). We just strip everything and get to the arg. | |
3399 | See g++.old-deja/g++.oliva/template4.C and g++.dg/template/nontype9.C | |
3400 | for examples. */ | |
3401 | if (TREE_CODE (expr) == NOP_EXPR) | |
75650646 | 3402 | { |
b6ab6892 | 3403 | if (TYPE_REF_OBJ_P (type) || TYPE_REFFN_P (type)) |
75650646 | 3404 | { |
b6ab6892 GB |
3405 | /* ??? Maybe we could use convert_from_reference here, but we |
3406 | would need to relax its constraints because the NOP_EXPR | |
3407 | could actually change the type to something more cv-qualified, | |
3408 | and this is not folded by convert_from_reference. */ | |
3409 | tree addr = TREE_OPERAND (expr, 0); | |
3410 | gcc_assert (TREE_CODE (expr_type) == REFERENCE_TYPE); | |
3411 | gcc_assert (TREE_CODE (addr) == ADDR_EXPR); | |
3412 | gcc_assert (TREE_CODE (TREE_TYPE (addr)) == POINTER_TYPE); | |
3413 | gcc_assert (same_type_ignoring_top_level_qualifiers_p | |
3414 | (TREE_TYPE (expr_type), | |
3415 | TREE_TYPE (TREE_TYPE (addr)))); | |
3416 | ||
3417 | expr = TREE_OPERAND (addr, 0); | |
3418 | expr_type = TREE_TYPE (expr); | |
75650646 MM |
3419 | } |
3420 | ||
b6ab6892 GB |
3421 | /* We could also generate a NOP_EXPR(ADDR_EXPR()) when the |
3422 | parameter is a pointer to object, through decay and | |
3423 | qualification conversion. Let's strip everything. */ | |
3424 | else if (TYPE_PTROBV_P (type)) | |
75650646 | 3425 | { |
b6ab6892 GB |
3426 | STRIP_NOPS (expr); |
3427 | gcc_assert (TREE_CODE (expr) == ADDR_EXPR); | |
3428 | gcc_assert (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE); | |
3429 | /* Skip the ADDR_EXPR only if it is part of the decay for | |
3430 | an array. Otherwise, it is part of the original argument | |
3431 | in the source code. */ | |
3432 | if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == ARRAY_TYPE) | |
3433 | expr = TREE_OPERAND (expr, 0); | |
3434 | expr_type = TREE_TYPE (expr); | |
f3400fe2 | 3435 | } |
75650646 | 3436 | } |
c61dce3a | 3437 | |
b6ab6892 | 3438 | /* [temp.arg.nontype]/5, bullet 1 |
75650646 | 3439 | |
b6ab6892 GB |
3440 | For a non-type template-parameter of integral or enumeration type, |
3441 | integral promotions (_conv.prom_) and integral conversions | |
3442 | (_conv.integral_) are applied. */ | |
3443 | if (INTEGRAL_TYPE_P (type)) | |
75650646 | 3444 | { |
75650646 MM |
3445 | if (!INTEGRAL_TYPE_P (expr_type)) |
3446 | return error_mark_node; | |
fddabb2c | 3447 | |
b6ab6892 GB |
3448 | expr = fold_decl_constant_value (expr); |
3449 | /* Notice that there are constant expressions like '4 % 0' which | |
3450 | do not fold into integer constants. */ | |
db02b6b9 | 3451 | if (TREE_CODE (expr) != INTEGER_CST) |
b6ab6892 GB |
3452 | { |
3453 | error ("%qE is not a valid template argument for type %qT " | |
3454 | "because it is a non-constant expression", expr, type); | |
3455 | return NULL_TREE; | |
3456 | } | |
75650646 | 3457 | |
b6ab6892 GB |
3458 | /* At this point, an implicit conversion does what we want, |
3459 | because we already know that the expression is of integral | |
3460 | type. */ | |
3461 | expr = ocp_convert (type, expr, CONV_IMPLICIT, LOOKUP_PROTECT); | |
3462 | if (expr == error_mark_node) | |
3463 | return error_mark_node; | |
75650646 | 3464 | |
b6ab6892 GB |
3465 | /* Conversion was allowed: fold it to a bare integer constant. */ |
3466 | expr = fold (expr); | |
3467 | } | |
3468 | /* [temp.arg.nontype]/5, bullet 2 | |
75650646 | 3469 | |
b6ab6892 GB |
3470 | For a non-type template-parameter of type pointer to object, |
3471 | qualification conversions (_conv.qual_) and the array-to-pointer | |
3472 | conversion (_conv.array_) are applied. */ | |
3473 | else if (TYPE_PTROBV_P (type)) | |
3474 | { | |
3475 | /* [temp.arg.nontype]/1 (TC1 version, DR 49): | |
75650646 | 3476 | |
b6ab6892 GB |
3477 | A template-argument for a non-type, non-template template-parameter |
3478 | shall be one of: [...] | |
75650646 | 3479 | |
b6ab6892 GB |
3480 | -- the name of a non-type template-parameter; |
3481 | -- the address of an object or function with external linkage, [...] | |
3482 | expressed as "& id-expression" where the & is optional if the name | |
3483 | refers to a function or array, or if the corresponding | |
3484 | template-parameter is a reference. | |
e1467ff2 | 3485 | |
b6ab6892 GB |
3486 | Here, we do not care about functions, as they are invalid anyway |
3487 | for a parameter of type pointer-to-object. */ | |
3488 | bool constant_address_p = | |
3489 | (TREE_CODE (expr) == ADDR_EXPR | |
3490 | || TREE_CODE (expr_type) == ARRAY_TYPE | |
3491 | || (DECL_P (expr) && DECL_TEMPLATE_PARM_P (expr))); | |
3492 | ||
3493 | expr = decay_conversion (expr); | |
3494 | if (expr == error_mark_node) | |
3495 | return error_mark_node; | |
75650646 | 3496 | |
b6ab6892 GB |
3497 | expr = perform_qualification_conversions (type, expr); |
3498 | if (expr == error_mark_node) | |
3499 | return error_mark_node; | |
0dc09a61 | 3500 | |
b6ab6892 GB |
3501 | if (!constant_address_p) |
3502 | { | |
3503 | error ("%qE is not a valid template argument for type %qT " | |
3504 | "because it is not a constant pointer", expr, type); | |
3505 | return NULL_TREE; | |
3506 | } | |
3507 | } | |
3508 | /* [temp.arg.nontype]/5, bullet 3 | |
3509 | ||
3510 | For a non-type template-parameter of type reference to object, no | |
3511 | conversions apply. The type referred to by the reference may be more | |
3512 | cv-qualified than the (otherwise identical) type of the | |
3513 | template-argument. The template-parameter is bound directly to the | |
3514 | template-argument, which must be an lvalue. */ | |
3515 | else if (TYPE_REF_OBJ_P (type)) | |
3516 | { | |
3517 | if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type), | |
3518 | expr_type)) | |
3519 | return error_mark_node; | |
75650646 | 3520 | |
b6ab6892 GB |
3521 | if (!at_least_as_qualified_p (TREE_TYPE (type), expr_type)) |
3522 | { | |
3523 | error ("%qE is not a valid template argument for type %qT " | |
3524 | "because of conflicts in cv-qualification", expr, type); | |
3525 | return NULL_TREE; | |
3526 | } | |
3527 | ||
3528 | if (!real_lvalue_p (expr)) | |
3529 | { | |
3530 | error ("%qE is not a valid template argument for type %qT " | |
3531 | "because it is not a lvalue", expr, type); | |
3532 | return NULL_TREE; | |
3533 | } | |
e6e174e5 | 3534 | |
b6ab6892 | 3535 | /* [temp.arg.nontype]/1 |
75650646 | 3536 | |
b6ab6892 GB |
3537 | A template-argument for a non-type, non-template template-parameter |
3538 | shall be one of: [...] | |
75650646 | 3539 | |
03fd3f84 | 3540 | -- the address of an object or function with external linkage. */ |
b6ab6892 GB |
3541 | if (!DECL_EXTERNAL_LINKAGE_P (expr)) |
3542 | { | |
3543 | error ("%qE is not a valid template argument for type %qT " | |
3544 | "because object %qD has not external linkage", | |
3545 | expr, type, expr); | |
3546 | return NULL_TREE; | |
3547 | } | |
0dc09a61 | 3548 | |
b6ab6892 GB |
3549 | expr = build_nop (type, build_address (expr)); |
3550 | } | |
3551 | /* [temp.arg.nontype]/5, bullet 4 | |
3552 | ||
3553 | For a non-type template-parameter of type pointer to function, only | |
3554 | the function-to-pointer conversion (_conv.func_) is applied. If the | |
3555 | template-argument represents a set of overloaded functions (or a | |
3556 | pointer to such), the matching function is selected from the set | |
3557 | (_over.over_). */ | |
3558 | else if (TYPE_PTRFN_P (type)) | |
3559 | { | |
3560 | /* If the argument is a template-id, we might not have enough | |
3561 | context information to decay the pointer. | |
3562 | ??? Why static5.C requires decay and subst1.C works fine | |
3563 | even without it? */ | |
3564 | if (!type_unknown_p (expr_type)) | |
3565 | { | |
3566 | expr = decay_conversion (expr); | |
3567 | if (expr == error_mark_node) | |
3568 | return error_mark_node; | |
3569 | } | |
75650646 | 3570 | |
b6ab6892 GB |
3571 | expr = convert_nontype_argument_function (type, expr); |
3572 | if (!expr || expr == error_mark_node) | |
3573 | return expr; | |
3574 | } | |
3575 | /* [temp.arg.nontype]/5, bullet 5 | |
75650646 | 3576 | |
b6ab6892 GB |
3577 | For a non-type template-parameter of type reference to function, no |
3578 | conversions apply. If the template-argument represents a set of | |
3579 | overloaded functions, the matching function is selected from the set | |
3580 | (_over.over_). */ | |
3581 | else if (TYPE_REFFN_P (type)) | |
3582 | { | |
3583 | if (TREE_CODE (expr) == ADDR_EXPR) | |
3584 | { | |
3585 | error ("%qE is not a valid template argument for type %qT " | |
3586 | "because it is a pointer", expr, type); | |
3587 | inform ("try using %qE instead", TREE_OPERAND (expr, 0)); | |
3588 | return NULL_TREE; | |
3589 | } | |
75650646 | 3590 | |
b6ab6892 GB |
3591 | expr = convert_nontype_argument_function (TREE_TYPE (type), expr); |
3592 | if (!expr || expr == error_mark_node) | |
3593 | return expr; | |
75650646 | 3594 | |
b6ab6892 GB |
3595 | expr = build_nop(type, build_address (expr)); |
3596 | } | |
3597 | /* [temp.arg.nontype]/5, bullet 6 | |
75650646 | 3598 | |
b6ab6892 GB |
3599 | For a non-type template-parameter of type pointer to member function, |
3600 | no conversions apply. If the template-argument represents a set of | |
3601 | overloaded member functions, the matching member function is selected | |
3602 | from the set (_over.over_). */ | |
3603 | else if (TYPE_PTRMEMFUNC_P (type)) | |
3604 | { | |
3605 | expr = instantiate_type (type, expr, tf_none); | |
3606 | if (expr == error_mark_node) | |
3607 | return error_mark_node; | |
75650646 | 3608 | |
b6ab6892 GB |
3609 | /* There is no way to disable standard conversions in |
3610 | resolve_address_of_overloaded_function (called by | |
3611 | instantiate_type). It is possible that the call succeeded by | |
3612 | converting &B::I to &D::I (where B is a base of D), so we need | |
3613 | to reject this conversion here. | |
75650646 | 3614 | |
b6ab6892 GB |
3615 | Actually, even if there was a way to disable standard conversions, |
3616 | it would still be better to reject them here so that we can | |
3617 | provide a superior diagnostic. */ | |
3618 | if (!same_type_p (TREE_TYPE (expr), type)) | |
3619 | { | |
3620 | /* Make sure we are just one standard conversion off. */ | |
3621 | gcc_assert (can_convert (type, TREE_TYPE (expr))); | |
3622 | error ("%qE is not a valid template argument for type %qT " | |
3623 | "because it is of type %qT", expr, type, | |
3624 | TREE_TYPE (expr)); | |
3625 | inform ("standard conversions are not allowed in this context"); | |
3626 | return NULL_TREE; | |
3627 | } | |
3628 | } | |
3629 | /* [temp.arg.nontype]/5, bullet 7 | |
59e7a901 | 3630 | |
b6ab6892 GB |
3631 | For a non-type template-parameter of type pointer to data member, |
3632 | qualification conversions (_conv.qual_) are applied. */ | |
3633 | else if (TYPE_PTRMEM_P (type)) | |
3634 | { | |
3635 | expr = perform_qualification_conversions (type, expr); | |
3636 | if (expr == error_mark_node) | |
75650646 | 3637 | return expr; |
75650646 | 3638 | } |
b6ab6892 GB |
3639 | /* A template non-type parameter must be one of the above. */ |
3640 | else | |
3641 | gcc_unreachable (); | |
75650646 | 3642 | |
b6ab6892 GB |
3643 | /* Sanity check: did we actually convert the argument to the |
3644 | right type? */ | |
3645 | gcc_assert (same_type_p (type, TREE_TYPE (expr))); | |
3646 | return expr; | |
75650646 MM |
3647 | } |
3648 | ||
b6ab6892 | 3649 | |
744fac59 KL |
3650 | /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for |
3651 | template template parameters. Both PARM_PARMS and ARG_PARMS are | |
3652 | vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL | |
3653 | or PARM_DECL. | |
3654 | ||
3655 | ARG_PARMS may contain more parameters than PARM_PARMS. If this is | |
3656 | the case, then extra parameters must have default arguments. | |
3657 | ||
3658 | Consider the example: | |
3659 | template <class T, class Allocator = allocator> class vector; | |
3660 | template<template <class U> class TT> class C; | |
3661 | ||
3662 | C<vector> is a valid instantiation. PARM_PARMS for the above code | |
3663 | contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for | |
3664 | T and Allocator) and OUTER_ARGS contains the argument that is used to | |
3665 | substitute the TT parameter. */ | |
3666 | ||
3667 | static int | |
3a978d72 NN |
3668 | coerce_template_template_parms (tree parm_parms, |
3669 | tree arg_parms, | |
3670 | tsubst_flags_t complain, | |
3671 | tree in_decl, | |
3672 | tree outer_args) | |
744fac59 KL |
3673 | { |
3674 | int nparms, nargs, i; | |
3675 | tree parm, arg; | |
3676 | ||
50bc768d NS |
3677 | gcc_assert (TREE_CODE (parm_parms) == TREE_VEC); |
3678 | gcc_assert (TREE_CODE (arg_parms) == TREE_VEC); | |
744fac59 KL |
3679 | |
3680 | nparms = TREE_VEC_LENGTH (parm_parms); | |
3681 | nargs = TREE_VEC_LENGTH (arg_parms); | |
3682 | ||
3683 | /* The rule here is opposite of coerce_template_parms. */ | |
3684 | if (nargs < nparms | |
3685 | || (nargs > nparms | |
3686 | && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE)) | |
3687 | return 0; | |
3688 | ||
3689 | for (i = 0; i < nparms; ++i) | |
3690 | { | |
3691 | parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i)); | |
3692 | arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i)); | |
3693 | ||
3694 | if (arg == NULL_TREE || arg == error_mark_node | |
3695 | || parm == NULL_TREE || parm == error_mark_node) | |
3696 | return 0; | |
3697 | ||
3698 | if (TREE_CODE (arg) != TREE_CODE (parm)) | |
3699 | return 0; | |
3700 | ||
3701 | switch (TREE_CODE (parm)) | |
3702 | { | |
3703 | case TYPE_DECL: | |
3704 | break; | |
3705 | ||
3706 | case TEMPLATE_DECL: | |
3707 | /* We encounter instantiations of templates like | |
3708 | template <template <template <class> class> class TT> | |
3709 | class C; */ | |
700466c2 JM |
3710 | { |
3711 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
3712 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3713 | ||
8c6ab2db NS |
3714 | if (!coerce_template_template_parms |
3715 | (parmparm, argparm, complain, in_decl, outer_args)) | |
700466c2 JM |
3716 | return 0; |
3717 | } | |
3718 | break; | |
744fac59 KL |
3719 | |
3720 | case PARM_DECL: | |
3721 | /* The tsubst call is used to handle cases such as | |
00bdb87f KL |
3722 | |
3723 | template <int> class C {}; | |
3724 | template <class T, template <T> class TT> class D {}; | |
3725 | D<int, C> d; | |
3726 | ||
744fac59 | 3727 | i.e. the parameter list of TT depends on earlier parameters. */ |
00bdb87f KL |
3728 | if (!dependent_type_p (TREE_TYPE (arg)) |
3729 | && !same_type_p | |
3730 | (tsubst (TREE_TYPE (parm), outer_args, complain, in_decl), | |
3731 | TREE_TYPE (arg))) | |
744fac59 KL |
3732 | return 0; |
3733 | break; | |
3734 | ||
3735 | default: | |
315fb5db | 3736 | gcc_unreachable (); |
744fac59 KL |
3737 | } |
3738 | } | |
3739 | return 1; | |
3740 | } | |
3741 | ||
8b5b8b7c MM |
3742 | /* Convert the indicated template ARG as necessary to match the |
3743 | indicated template PARM. Returns the converted ARG, or | |
c2ea3a40 NS |
3744 | error_mark_node if the conversion was unsuccessful. Error and |
3745 | warning messages are issued under control of COMPLAIN. This | |
3746 | conversion is for the Ith parameter in the parameter list. ARGS is | |
3747 | the full set of template arguments deduced so far. */ | |
8b5b8b7c MM |
3748 | |
3749 | static tree | |
3a978d72 NN |
3750 | convert_template_argument (tree parm, |
3751 | tree arg, | |
3752 | tree args, | |
3753 | tsubst_flags_t complain, | |
3754 | int i, | |
3755 | tree in_decl) | |
8b5b8b7c MM |
3756 | { |
3757 | tree val; | |
3758 | tree inner_args; | |
3759 | int is_type, requires_type, is_tmpl_type, requires_tmpl_type; | |
3760 | ||
f9a7ae04 | 3761 | inner_args = INNERMOST_TEMPLATE_ARGS (args); |
8b5b8b7c MM |
3762 | |
3763 | if (TREE_CODE (arg) == TREE_LIST | |
a5ac359a | 3764 | && TREE_CODE (TREE_VALUE (arg)) == OFFSET_REF) |
8b5b8b7c MM |
3765 | { |
3766 | /* The template argument was the name of some | |
3767 | member function. That's usually | |
0e339752 | 3768 | invalid, but static members are OK. In any |
8b5b8b7c MM |
3769 | case, grab the underlying fields/functions |
3770 | and issue an error later if required. */ | |
3771 | arg = TREE_VALUE (arg); | |
3772 | TREE_TYPE (arg) = unknown_type_node; | |
3773 | } | |
3774 | ||
3775 | requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL; | |
3776 | requires_type = (TREE_CODE (parm) == TYPE_DECL | |
3777 | || requires_tmpl_type); | |
3778 | ||
cbd63935 KL |
3779 | is_tmpl_type = ((TREE_CODE (arg) == TEMPLATE_DECL |
3780 | && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL) | |
3781 | || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
3782 | || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE); | |
303d1c55 | 3783 | |
b8c6534b KL |
3784 | if (is_tmpl_type |
3785 | && (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
3786 | || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE)) | |
8b5b8b7c | 3787 | arg = TYPE_STUB_DECL (arg); |
8b5b8b7c | 3788 | |
2f939d94 | 3789 | is_type = TYPE_P (arg) || is_tmpl_type; |
8b5b8b7c MM |
3790 | |
3791 | if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF | |
3792 | && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM) | |
3793 | { | |
0f51ccfc GDR |
3794 | pedwarn ("to refer to a type member of a template parameter, " |
3795 | "use %<typename %E%>", arg); | |
8b5b8b7c MM |
3796 | |
3797 | arg = make_typename_type (TREE_OPERAND (arg, 0), | |
3baa501d | 3798 | TREE_OPERAND (arg, 1), |
fc6a28d7 | 3799 | typename_type, |
c2ea3a40 | 3800 | complain & tf_error); |
8b5b8b7c MM |
3801 | is_type = 1; |
3802 | } | |
3803 | if (is_type != requires_type) | |
3804 | { | |
3805 | if (in_decl) | |
3806 | { | |
c2ea3a40 | 3807 | if (complain & tf_error) |
8b5b8b7c | 3808 | { |
0f51ccfc GDR |
3809 | error ("type/value mismatch at argument %d in template " |
3810 | "parameter list for %qD", | |
3811 | i + 1, in_decl); | |
8b5b8b7c | 3812 | if (is_type) |
0f51ccfc GDR |
3813 | error (" expected a constant of type %qT, got %qT", |
3814 | TREE_TYPE (parm), | |
3815 | (is_tmpl_type ? DECL_NAME (arg) : arg)); | |
d12a7283 | 3816 | else if (requires_tmpl_type) |
0f51ccfc | 3817 | error (" expected a class template, got %qE", arg); |
8b5b8b7c | 3818 | else |
0f51ccfc | 3819 | error (" expected a type, got %qE", arg); |
8b5b8b7c MM |
3820 | } |
3821 | } | |
3822 | return error_mark_node; | |
3823 | } | |
3824 | if (is_tmpl_type ^ requires_tmpl_type) | |
3825 | { | |
c2ea3a40 | 3826 | if (in_decl && (complain & tf_error)) |
8b5b8b7c | 3827 | { |
0f51ccfc GDR |
3828 | error ("type/value mismatch at argument %d in template " |
3829 | "parameter list for %qD", | |
3830 | i + 1, in_decl); | |
8b5b8b7c | 3831 | if (is_tmpl_type) |
0f51ccfc | 3832 | error (" expected a type, got %qT", DECL_NAME (arg)); |
8b5b8b7c | 3833 | else |
0f51ccfc | 3834 | error (" expected a class template, got %qT", arg); |
8b5b8b7c MM |
3835 | } |
3836 | return error_mark_node; | |
3837 | } | |
3838 | ||
3839 | if (is_type) | |
3840 | { | |
3841 | if (requires_tmpl_type) | |
3842 | { | |
b8c6534b KL |
3843 | if (TREE_CODE (TREE_TYPE (arg)) == UNBOUND_CLASS_TEMPLATE) |
3844 | /* The number of argument required is not known yet. | |
3845 | Just accept it for now. */ | |
3846 | val = TREE_TYPE (arg); | |
8b5b8b7c MM |
3847 | else |
3848 | { | |
b8c6534b KL |
3849 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); |
3850 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3851 | ||
3852 | if (coerce_template_template_parms (parmparm, argparm, | |
3853 | complain, in_decl, | |
3854 | inner_args)) | |
8b5b8b7c | 3855 | { |
b8c6534b KL |
3856 | val = arg; |
3857 | ||
3858 | /* TEMPLATE_TEMPLATE_PARM node is preferred over | |
3859 | TEMPLATE_DECL. */ | |
3860 | if (val != error_mark_node | |
3861 | && DECL_TEMPLATE_TEMPLATE_PARM_P (val)) | |
3862 | val = TREE_TYPE (val); | |
8b5b8b7c | 3863 | } |
b8c6534b KL |
3864 | else |
3865 | { | |
c2ea3a40 | 3866 | if (in_decl && (complain & tf_error)) |
b8c6534b | 3867 | { |
0f51ccfc GDR |
3868 | error ("type/value mismatch at argument %d in " |
3869 | "template parameter list for %qD", | |
3870 | i + 1, in_decl); | |
3871 | error (" expected a template of type %qD, got %qD", | |
3872 | parm, arg); | |
b8c6534b | 3873 | } |
8b5b8b7c | 3874 | |
b8c6534b KL |
3875 | val = error_mark_node; |
3876 | } | |
8b5b8b7c MM |
3877 | } |
3878 | } | |
3879 | else | |
058b15c1 | 3880 | val = arg; |
8b5b8b7c MM |
3881 | } |
3882 | else | |
3883 | { | |
4393e105 | 3884 | tree t = tsubst (TREE_TYPE (parm), args, complain, in_decl); |
8b5b8b7c | 3885 | |
11b810f1 | 3886 | if (invalid_nontype_parm_type_p (t, complain)) |
db3f4e4e NS |
3887 | return error_mark_node; |
3888 | ||
d768a589 | 3889 | if (!uses_template_parms (arg) && !uses_template_parms (t)) |
8b5b8b7c MM |
3890 | /* We used to call digest_init here. However, digest_init |
3891 | will report errors, which we don't want when complain | |
3892 | is zero. More importantly, digest_init will try too | |
3893 | hard to convert things: for example, `0' should not be | |
3894 | converted to pointer type at this point according to | |
3895 | the standard. Accepting this is not merely an | |
3896 | extension, since deciding whether or not these | |
3897 | conversions can occur is part of determining which | |
dc957d14 | 3898 | function template to call, or whether a given explicit |
0e339752 | 3899 | argument specification is valid. */ |
8b5b8b7c MM |
3900 | val = convert_nontype_argument (t, arg); |
3901 | else | |
3902 | val = arg; | |
3903 | ||
3904 | if (val == NULL_TREE) | |
3905 | val = error_mark_node; | |
c2ea3a40 | 3906 | else if (val == error_mark_node && (complain & tf_error)) |
0f51ccfc | 3907 | error ("could not convert template argument %qE to %qT", arg, t); |
8b5b8b7c MM |
3908 | } |
3909 | ||
3910 | return val; | |
3911 | } | |
3912 | ||
3913 | /* Convert all template arguments to their appropriate types, and | |
3914 | return a vector containing the innermost resulting template | |
c2ea3a40 | 3915 | arguments. If any error occurs, return error_mark_node. Error and |
3e4a3562 | 3916 | warning messages are issued under control of COMPLAIN. |
75650646 | 3917 | |
838dfd8a | 3918 | If REQUIRE_ALL_ARGUMENTS is nonzero, all arguments must be |
75650646 MM |
3919 | provided in ARGLIST, or else trailing parameters must have default |
3920 | values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument | |
6dfbb909 | 3921 | deduction for any unspecified trailing arguments. */ |
de575009 | 3922 | |
8d08fdba | 3923 | static tree |
3a978d72 NN |
3924 | coerce_template_parms (tree parms, |
3925 | tree args, | |
3926 | tree in_decl, | |
3927 | tsubst_flags_t complain, | |
3928 | int require_all_arguments) | |
8d08fdba | 3929 | { |
a292b002 | 3930 | int nparms, nargs, i, lost = 0; |
e4a84209 | 3931 | tree inner_args; |
8b5b8b7c MM |
3932 | tree new_args; |
3933 | tree new_inner_args; | |
a292b002 | 3934 | |
f9a7ae04 | 3935 | inner_args = INNERMOST_TEMPLATE_ARGS (args); |
bf12d54d | 3936 | nargs = inner_args ? NUM_TMPL_ARGS (inner_args) : 0; |
a292b002 MS |
3937 | nparms = TREE_VEC_LENGTH (parms); |
3938 | ||
3939 | if (nargs > nparms | |
3940 | || (nargs < nparms | |
75650646 | 3941 | && require_all_arguments |
a292b002 | 3942 | && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE)) |
8d08fdba | 3943 | { |
c2ea3a40 | 3944 | if (complain & tf_error) |
75650646 | 3945 | { |
33bd39a2 | 3946 | error ("wrong number of template arguments (%d, should be %d)", |
0f51ccfc | 3947 | nargs, nparms); |
75650646 MM |
3948 | |
3949 | if (in_decl) | |
0f51ccfc | 3950 | cp_error_at ("provided for %qD", in_decl); |
75650646 MM |
3951 | } |
3952 | ||
8d08fdba MS |
3953 | return error_mark_node; |
3954 | } | |
3955 | ||
f31c0a32 | 3956 | new_inner_args = make_tree_vec (nparms); |
8b5b8b7c MM |
3957 | new_args = add_outermost_template_args (args, new_inner_args); |
3958 | for (i = 0; i < nparms; i++) | |
8d08fdba | 3959 | { |
8b5b8b7c MM |
3960 | tree arg; |
3961 | tree parm; | |
e4a84209 | 3962 | |
8b5b8b7c MM |
3963 | /* Get the Ith template parameter. */ |
3964 | parm = TREE_VEC_ELT (parms, i); | |
75650646 | 3965 | |
8b5b8b7c | 3966 | /* Calculate the Ith argument. */ |
bf12d54d | 3967 | if (i < nargs) |
8b5b8b7c | 3968 | arg = TREE_VEC_ELT (inner_args, i); |
ffd49b19 | 3969 | else if (require_all_arguments) |
04c06002 | 3970 | /* There must be a default arg in this case. */ |
a91db711 NS |
3971 | arg = tsubst_template_arg (TREE_PURPOSE (parm), new_args, |
3972 | complain, in_decl); | |
ffd49b19 NS |
3973 | else |
3974 | break; | |
3975 | ||
50bc768d | 3976 | gcc_assert (arg); |
ffd49b19 | 3977 | if (arg == error_mark_node) |
e34b0922 KL |
3978 | { |
3979 | if (complain & tf_error) | |
3980 | error ("template argument %d is invalid", i + 1); | |
3981 | } | |
8b5b8b7c MM |
3982 | else |
3983 | arg = convert_template_argument (TREE_VALUE (parm), | |
3984 | arg, new_args, complain, i, | |
3985 | in_decl); | |
3986 | ||
3987 | if (arg == error_mark_node) | |
8d08fdba | 3988 | lost++; |
8b5b8b7c | 3989 | TREE_VEC_ELT (new_inner_args, i) = arg; |
8d08fdba | 3990 | } |
8b5b8b7c | 3991 | |
8d08fdba MS |
3992 | if (lost) |
3993 | return error_mark_node; | |
8b5b8b7c MM |
3994 | |
3995 | return new_inner_args; | |
8d08fdba MS |
3996 | } |
3997 | ||
34016c81 JM |
3998 | /* Returns 1 if template args OT and NT are equivalent. */ |
3999 | ||
d8e178a0 | 4000 | static int |
3a978d72 | 4001 | template_args_equal (tree ot, tree nt) |
34016c81 JM |
4002 | { |
4003 | if (nt == ot) | |
4004 | return 1; | |
74601d7c | 4005 | |
34016c81 JM |
4006 | if (TREE_CODE (nt) == TREE_VEC) |
4007 | /* For member templates */ | |
74601d7c KL |
4008 | return TREE_CODE (ot) == TREE_VEC && comp_template_args (ot, nt); |
4009 | else if (TYPE_P (nt)) | |
4010 | return TYPE_P (ot) && same_type_p (ot, nt); | |
4011 | else if (TREE_CODE (ot) == TREE_VEC || TYPE_P (ot)) | |
4012 | return 0; | |
34016c81 | 4013 | else |
c8a209ca | 4014 | return cp_tree_equal (ot, nt); |
34016c81 JM |
4015 | } |
4016 | ||
4017 | /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets | |
f84b4be9 JM |
4018 | of template arguments. Returns 0 otherwise. */ |
4019 | ||
6757edfe | 4020 | int |
3a978d72 | 4021 | comp_template_args (tree oldargs, tree newargs) |
5566b478 MS |
4022 | { |
4023 | int i; | |
4024 | ||
386b8a85 JM |
4025 | if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs)) |
4026 | return 0; | |
4027 | ||
5566b478 MS |
4028 | for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i) |
4029 | { | |
4030 | tree nt = TREE_VEC_ELT (newargs, i); | |
4031 | tree ot = TREE_VEC_ELT (oldargs, i); | |
4032 | ||
34016c81 | 4033 | if (! template_args_equal (ot, nt)) |
61a127b3 | 4034 | return 0; |
5566b478 MS |
4035 | } |
4036 | return 1; | |
4037 | } | |
4038 | ||
8d08fdba MS |
4039 | /* Given class template name and parameter list, produce a user-friendly name |
4040 | for the instantiation. */ | |
e92cc029 | 4041 | |
8d08fdba | 4042 | static char * |
3a978d72 | 4043 | mangle_class_name_for_template (const char* name, tree parms, tree arglist) |
8d08fdba MS |
4044 | { |
4045 | static struct obstack scratch_obstack; | |
4046 | static char *scratch_firstobj; | |
4047 | int i, nparms; | |
8d08fdba MS |
4048 | |
4049 | if (!scratch_firstobj) | |
fc378698 | 4050 | gcc_obstack_init (&scratch_obstack); |
8d08fdba MS |
4051 | else |
4052 | obstack_free (&scratch_obstack, scratch_firstobj); | |
fc378698 | 4053 | scratch_firstobj = obstack_alloc (&scratch_obstack, 1); |
8d08fdba | 4054 | |
18e314ad GS |
4055 | #define ccat(C) obstack_1grow (&scratch_obstack, (C)); |
4056 | #define cat(S) obstack_grow (&scratch_obstack, (S), strlen (S)) | |
8d08fdba MS |
4057 | |
4058 | cat (name); | |
4059 | ccat ('<'); | |
4060 | nparms = TREE_VEC_LENGTH (parms); | |
f9a7ae04 | 4061 | arglist = INNERMOST_TEMPLATE_ARGS (arglist); |
50bc768d | 4062 | gcc_assert (nparms == TREE_VEC_LENGTH (arglist)); |
8d08fdba MS |
4063 | for (i = 0; i < nparms; i++) |
4064 | { | |
a292b002 MS |
4065 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
4066 | tree arg = TREE_VEC_ELT (arglist, i); | |
8d08fdba MS |
4067 | |
4068 | if (i) | |
4069 | ccat (','); | |
4070 | ||
a292b002 | 4071 | if (TREE_CODE (parm) == TYPE_DECL) |
8d08fdba | 4072 | { |
761f0855 | 4073 | cat (type_as_string (arg, TFF_CHASE_TYPEDEF)); |
8d08fdba MS |
4074 | continue; |
4075 | } | |
73b0fce8 KL |
4076 | else if (TREE_CODE (parm) == TEMPLATE_DECL) |
4077 | { | |
4078 | if (TREE_CODE (arg) == TEMPLATE_DECL) | |
2c73f9f5 ML |
4079 | { |
4080 | /* Already substituted with real template. Just output | |
4081 | the template name here */ | |
cb0dbb9a | 4082 | tree context = DECL_CONTEXT (arg); |
ec4f972f AS |
4083 | if (context) |
4084 | { | |
4085 | /* The template may be defined in a namespace, or | |
4086 | may be a member template. */ | |
50bc768d NS |
4087 | gcc_assert (TREE_CODE (context) == NAMESPACE_DECL |
4088 | || CLASS_TYPE_P (context)); | |
4089 | cat (decl_as_string (DECL_CONTEXT (arg), | |
4090 | TFF_PLAIN_IDENTIFIER)); | |
4091 | cat ("::"); | |
2c73f9f5 ML |
4092 | } |
4093 | cat (IDENTIFIER_POINTER (DECL_NAME (arg))); | |
4094 | } | |
73b0fce8 | 4095 | else |
f4f206f4 | 4096 | /* Output the parameter declaration. */ |
761f0855 | 4097 | cat (type_as_string (arg, TFF_CHASE_TYPEDEF)); |
73b0fce8 KL |
4098 | continue; |
4099 | } | |
8d08fdba | 4100 | else |
50bc768d | 4101 | gcc_assert (TREE_CODE (parm) == PARM_DECL); |
8d08fdba | 4102 | |
8d08fdba MS |
4103 | /* No need to check arglist against parmlist here; we did that |
4104 | in coerce_template_parms, called from lookup_template_class. */ | |
761f0855 | 4105 | cat (expr_as_string (arg, TFF_PLAIN_IDENTIFIER)); |
8d08fdba MS |
4106 | } |
4107 | { | |
4108 | char *bufp = obstack_next_free (&scratch_obstack); | |
4109 | int offset = 0; | |
4110 | while (bufp[offset - 1] == ' ') | |
4111 | offset--; | |
4112 | obstack_blank_fast (&scratch_obstack, offset); | |
4113 | ||
4114 | /* B<C<char> >, not B<C<char>> */ | |
4115 | if (bufp[offset - 1] == '>') | |
4116 | ccat (' '); | |
4117 | } | |
4118 | ccat ('>'); | |
4119 | ccat ('\0'); | |
4120 | return (char *) obstack_base (&scratch_obstack); | |
8d08fdba MS |
4121 | } |
4122 | ||
bd6dd845 | 4123 | static tree |
3a978d72 | 4124 | classtype_mangled_name (tree t) |
5566b478 MS |
4125 | { |
4126 | if (CLASSTYPE_TEMPLATE_INFO (t) | |
36a117a5 MM |
4127 | /* Specializations have already had their names set up in |
4128 | lookup_template_class. */ | |
370af2d5 | 4129 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
9fbf56f7 MM |
4130 | { |
4131 | tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t)); | |
4132 | ||
36a117a5 MM |
4133 | /* For non-primary templates, the template parameters are |
4134 | implicit from their surrounding context. */ | |
9fbf56f7 MM |
4135 | if (PRIMARY_TEMPLATE_P (tmpl)) |
4136 | { | |
4137 | tree name = DECL_NAME (tmpl); | |
4138 | char *mangled_name = mangle_class_name_for_template | |
4139 | (IDENTIFIER_POINTER (name), | |
4140 | DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
4141 | CLASSTYPE_TI_ARGS (t)); | |
4142 | tree id = get_identifier (mangled_name); | |
4143 | IDENTIFIER_TEMPLATE (id) = name; | |
4144 | return id; | |
4145 | } | |
5566b478 | 4146 | } |
9fbf56f7 MM |
4147 | |
4148 | return TYPE_IDENTIFIER (t); | |
5566b478 MS |
4149 | } |
4150 | ||
4151 | static void | |
3a978d72 | 4152 | add_pending_template (tree d) |
5566b478 | 4153 | { |
3ae18eaf JM |
4154 | tree ti = (TYPE_P (d) |
4155 | ? CLASSTYPE_TEMPLATE_INFO (d) | |
4156 | : DECL_TEMPLATE_INFO (d)); | |
46ccf50a | 4157 | tree pt; |
3ae18eaf | 4158 | int level; |
e92cc029 | 4159 | |
824b9a4c | 4160 | if (TI_PENDING_TEMPLATE_FLAG (ti)) |
5566b478 MS |
4161 | return; |
4162 | ||
3ae18eaf JM |
4163 | /* We are called both from instantiate_decl, where we've already had a |
4164 | tinst_level pushed, and instantiate_template, where we haven't. | |
4165 | Compensate. */ | |
4166 | level = !(current_tinst_level && TINST_DECL (current_tinst_level) == d); | |
4167 | ||
4168 | if (level) | |
4169 | push_tinst_level (d); | |
4170 | ||
46ccf50a JM |
4171 | pt = tree_cons (current_tinst_level, d, NULL_TREE); |
4172 | if (last_pending_template) | |
4173 | TREE_CHAIN (last_pending_template) = pt; | |
4174 | else | |
4175 | pending_templates = pt; | |
4176 | ||
4177 | last_pending_template = pt; | |
4178 | ||
824b9a4c | 4179 | TI_PENDING_TEMPLATE_FLAG (ti) = 1; |
3ae18eaf JM |
4180 | |
4181 | if (level) | |
4182 | pop_tinst_level (); | |
5566b478 MS |
4183 | } |
4184 | ||
386b8a85 | 4185 | |
4ba126e4 MM |
4186 | /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS and |
4187 | ARGLIST. Valid choices for FNS are given in the cp-tree.def | |
4188 | documentation for TEMPLATE_ID_EXPR. */ | |
386b8a85 JM |
4189 | |
4190 | tree | |
3a978d72 | 4191 | lookup_template_function (tree fns, tree arglist) |
386b8a85 | 4192 | { |
2c73f9f5 | 4193 | tree type; |
050367a3 | 4194 | |
4ba126e4 MM |
4195 | if (fns == error_mark_node || arglist == error_mark_node) |
4196 | return error_mark_node; | |
4197 | ||
50bc768d | 4198 | gcc_assert (!arglist || TREE_CODE (arglist) == TREE_VEC); |
ceeae2d1 MM |
4199 | if (fns == NULL_TREE |
4200 | || TREE_CODE (fns) == FUNCTION_DECL) | |
386b8a85 | 4201 | { |
33bd39a2 | 4202 | error ("non-template used as template"); |
386b8a85 JM |
4203 | return error_mark_node; |
4204 | } | |
4205 | ||
50bc768d NS |
4206 | gcc_assert (TREE_CODE (fns) == TEMPLATE_DECL |
4207 | || TREE_CODE (fns) == OVERLOAD | |
4208 | || BASELINK_P (fns) | |
4209 | || TREE_CODE (fns) == IDENTIFIER_NODE); | |
4ba126e4 | 4210 | |
50ad9642 MM |
4211 | if (BASELINK_P (fns)) |
4212 | { | |
f293ce4b RS |
4213 | BASELINK_FUNCTIONS (fns) = build2 (TEMPLATE_ID_EXPR, |
4214 | unknown_type_node, | |
4215 | BASELINK_FUNCTIONS (fns), | |
4216 | arglist); | |
50ad9642 MM |
4217 | return fns; |
4218 | } | |
4219 | ||
2c73f9f5 ML |
4220 | type = TREE_TYPE (fns); |
4221 | if (TREE_CODE (fns) == OVERLOAD || !type) | |
4222 | type = unknown_type_node; | |
4ba126e4 | 4223 | |
f293ce4b | 4224 | return build2 (TEMPLATE_ID_EXPR, type, fns, arglist); |
386b8a85 JM |
4225 | } |
4226 | ||
a2b60a0e MM |
4227 | /* Within the scope of a template class S<T>, the name S gets bound |
4228 | (in build_self_reference) to a TYPE_DECL for the class, not a | |
4229 | TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type, | |
4230 | or one of its enclosing classes, and that type is a template, | |
4231 | return the associated TEMPLATE_DECL. Otherwise, the original | |
4232 | DECL is returned. */ | |
4233 | ||
a723baf1 | 4234 | tree |
3a978d72 | 4235 | maybe_get_template_decl_from_type_decl (tree decl) |
a2b60a0e MM |
4236 | { |
4237 | return (decl != NULL_TREE | |
4238 | && TREE_CODE (decl) == TYPE_DECL | |
4239 | && DECL_ARTIFICIAL (decl) | |
511b60ff | 4240 | && CLASS_TYPE_P (TREE_TYPE (decl)) |
a2b60a0e MM |
4241 | && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl))) |
4242 | ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl; | |
4243 | } | |
386b8a85 | 4244 | |
8d08fdba MS |
4245 | /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of |
4246 | parameters, find the desired type. | |
4247 | ||
4248 | D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments. | |
8d08fdba MS |
4249 | |
4250 | IN_DECL, if non-NULL, is the template declaration we are trying to | |
75650646 MM |
4251 | instantiate. |
4252 | ||
838dfd8a | 4253 | If ENTERING_SCOPE is nonzero, we are about to enter the scope of |
36a117a5 | 4254 | the class we are looking up. |
f9c244b8 | 4255 | |
c2ea3a40 | 4256 | Issue error and warning messages under control of COMPLAIN. |
36a117a5 | 4257 | |
75650646 MM |
4258 | If the template class is really a local class in a template |
4259 | function, then the FUNCTION_CONTEXT is the function in which it is | |
b6ab6892 GB |
4260 | being instantiated. |
4261 | ||
4262 | ??? Note that this function is currently called *twice* for each | |
4263 | template-id: the first time from the parser, while creating the | |
4264 | incomplete type (finish_template_type), and the second type during the | |
4265 | real instantiation (instantiate_template_class). This is surely something | |
4266 | that we want to avoid. It also causes some problems with argument | |
4267 | coercion (see convert_nontype_argument for more information on this). */ | |
e92cc029 | 4268 | |
8d08fdba | 4269 | tree |
3a978d72 NN |
4270 | lookup_template_class (tree d1, |
4271 | tree arglist, | |
4272 | tree in_decl, | |
4273 | tree context, | |
4274 | int entering_scope, | |
4275 | tsubst_flags_t complain) | |
8d08fdba | 4276 | { |
a703fb38 | 4277 | tree template = NULL_TREE, parmlist; |
dbfe2124 | 4278 | tree t; |
42eaed49 | 4279 | |
fd295cb2 | 4280 | timevar_push (TV_NAME_LOOKUP); |
42eaed49 | 4281 | |
5566b478 MS |
4282 | if (TREE_CODE (d1) == IDENTIFIER_NODE) |
4283 | { | |
90ea9897 MM |
4284 | tree value = innermost_non_namespace_value (d1); |
4285 | if (value && DECL_TEMPLATE_TEMPLATE_PARM_P (value)) | |
4286 | template = value; | |
73b0fce8 KL |
4287 | else |
4288 | { | |
2c73f9f5 ML |
4289 | if (context) |
4290 | push_decl_namespace (context); | |
3ebc5c52 MM |
4291 | template = lookup_name (d1, /*prefer_type=*/0); |
4292 | template = maybe_get_template_decl_from_type_decl (template); | |
2c73f9f5 ML |
4293 | if (context) |
4294 | pop_decl_namespace (); | |
73b0fce8 | 4295 | } |
8d019cef JM |
4296 | if (template) |
4297 | context = DECL_CONTEXT (template); | |
5566b478 | 4298 | } |
c91a56d2 MS |
4299 | else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1))) |
4300 | { | |
802dbc34 JM |
4301 | tree type = TREE_TYPE (d1); |
4302 | ||
4303 | /* If we are declaring a constructor, say A<T>::A<T>, we will get | |
4304 | an implicit typename for the second A. Deal with it. */ | |
4305 | if (TREE_CODE (type) == TYPENAME_TYPE && TREE_TYPE (type)) | |
4306 | type = TREE_TYPE (type); | |
4307 | ||
4308 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
f3400fe2 | 4309 | { |
802dbc34 | 4310 | template = CLASSTYPE_TI_TEMPLATE (type); |
f3400fe2 JM |
4311 | d1 = DECL_NAME (template); |
4312 | } | |
c91a56d2 | 4313 | } |
ed44da02 | 4314 | else if (TREE_CODE (d1) == ENUMERAL_TYPE |
2f939d94 | 4315 | || (TYPE_P (d1) && IS_AGGR_TYPE (d1))) |
5566b478 | 4316 | { |
ed44da02 | 4317 | template = TYPE_TI_TEMPLATE (d1); |
5566b478 MS |
4318 | d1 = DECL_NAME (template); |
4319 | } | |
93cdc044 | 4320 | else if (TREE_CODE (d1) == TEMPLATE_DECL |
17aec3eb | 4321 | && TREE_CODE (DECL_TEMPLATE_RESULT (d1)) == TYPE_DECL) |
93cdc044 JM |
4322 | { |
4323 | template = d1; | |
4324 | d1 = DECL_NAME (template); | |
4325 | context = DECL_CONTEXT (template); | |
4326 | } | |
8d08fdba | 4327 | |
90ea9897 | 4328 | /* Issue an error message if we didn't find a template. */ |
8d08fdba | 4329 | if (! template) |
f3400fe2 | 4330 | { |
c2ea3a40 | 4331 | if (complain & tf_error) |
0f51ccfc | 4332 | error ("%qT is not a template", d1); |
fd295cb2 | 4333 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
f3400fe2 | 4334 | } |
2c73f9f5 | 4335 | |
a87b4257 | 4336 | if (TREE_CODE (template) != TEMPLATE_DECL |
42eaed49 NS |
4337 | /* Make sure it's a user visible template, if it was named by |
4338 | the user. */ | |
4339 | || ((complain & tf_user) && !DECL_TEMPLATE_PARM_P (template) | |
4340 | && !PRIMARY_TEMPLATE_P (template))) | |
8d08fdba | 4341 | { |
c2ea3a40 | 4342 | if (complain & tf_error) |
f9c244b8 | 4343 | { |
0f51ccfc | 4344 | error ("non-template type %qT used as a template", d1); |
f9c244b8 | 4345 | if (in_decl) |
0f51ccfc | 4346 | cp_error_at ("for template declaration %qD", in_decl); |
f9c244b8 | 4347 | } |
fd295cb2 | 4348 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
8d08fdba | 4349 | } |
8d08fdba | 4350 | |
42eaed49 NS |
4351 | complain &= ~tf_user; |
4352 | ||
73b0fce8 KL |
4353 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (template)) |
4354 | { | |
4355 | /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store | |
4356 | template arguments */ | |
4357 | ||
1899c3a4 | 4358 | tree parm; |
73b0fce8 KL |
4359 | tree arglist2; |
4360 | ||
73b0fce8 KL |
4361 | parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template); |
4362 | ||
4f96ff63 KL |
4363 | /* Consider an example where a template template parameter declared as |
4364 | ||
4365 | template <class T, class U = std::allocator<T> > class TT | |
4366 | ||
4367 | The template parameter level of T and U are one level larger than | |
4368 | of TT. To proper process the default argument of U, say when an | |
4369 | instantiation `TT<int>' is seen, we need to build the full | |
342cea95 KL |
4370 | arguments containing {int} as the innermost level. Outer levels, |
4371 | available when not appearing as default template argument, can be | |
4372 | obtained from `current_template_args ()'. | |
4f96ff63 | 4373 | |
342cea95 KL |
4374 | Suppose that TT is later substituted with std::vector. The above |
4375 | instantiation is `TT<int, std::allocator<T> >' with TT at | |
4376 | level 1, and T at level 2, while the template arguments at level 1 | |
4377 | becomes {std::vector} and the inner level 2 is {int}. */ | |
4378 | ||
4379 | if (current_template_parms) | |
4f96ff63 KL |
4380 | arglist = add_to_template_args (current_template_args (), arglist); |
4381 | ||
f9c244b8 NS |
4382 | arglist2 = coerce_template_parms (parmlist, arglist, template, |
4383 | complain, /*require_all_args=*/1); | |
3e4a3562 | 4384 | if (arglist2 == error_mark_node |
544aef8c | 4385 | || (!uses_template_parms (arglist2) |
3e4a3562 | 4386 | && check_instantiated_args (template, arglist2, complain))) |
fd295cb2 | 4387 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
73b0fce8 | 4388 | |
dac65501 | 4389 | parm = bind_template_template_parm (TREE_TYPE (template), arglist2); |
fd295cb2 | 4390 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, parm); |
73b0fce8 | 4391 | } |
36a117a5 | 4392 | else |
8d08fdba | 4393 | { |
36a117a5 | 4394 | tree template_type = TREE_TYPE (template); |
7ac7b28f | 4395 | tree gen_tmpl; |
36a117a5 MM |
4396 | tree type_decl; |
4397 | tree found = NULL_TREE; | |
4398 | int arg_depth; | |
4399 | int parm_depth; | |
dbfe2124 | 4400 | int is_partial_instantiation; |
830bfa74 | 4401 | |
7ac7b28f MM |
4402 | gen_tmpl = most_general_template (template); |
4403 | parmlist = DECL_TEMPLATE_PARMS (gen_tmpl); | |
36a117a5 MM |
4404 | parm_depth = TMPL_PARMS_DEPTH (parmlist); |
4405 | arg_depth = TMPL_ARGS_DEPTH (arglist); | |
4406 | ||
4407 | if (arg_depth == 1 && parm_depth > 1) | |
4408 | { | |
39c01e4c | 4409 | /* We've been given an incomplete set of template arguments. |
36a117a5 MM |
4410 | For example, given: |
4411 | ||
4412 | template <class T> struct S1 { | |
4413 | template <class U> struct S2 {}; | |
4414 | template <class U> struct S2<U*> {}; | |
4415 | }; | |
4416 | ||
4417 | we will be called with an ARGLIST of `U*', but the | |
4418 | TEMPLATE will be `template <class T> template | |
4419 | <class U> struct S1<T>::S2'. We must fill in the missing | |
4420 | arguments. */ | |
7ac7b28f MM |
4421 | arglist |
4422 | = add_outermost_template_args (TYPE_TI_ARGS (TREE_TYPE (template)), | |
4423 | arglist); | |
36a117a5 MM |
4424 | arg_depth = TMPL_ARGS_DEPTH (arglist); |
4425 | } | |
5566b478 | 4426 | |
41f5d4b1 | 4427 | /* Now we should have enough arguments. */ |
50bc768d | 4428 | gcc_assert (parm_depth == arg_depth); |
36a117a5 | 4429 | |
7ac7b28f MM |
4430 | /* From here on, we're only interested in the most general |
4431 | template. */ | |
4432 | template = gen_tmpl; | |
4433 | ||
36a117a5 MM |
4434 | /* Calculate the BOUND_ARGS. These will be the args that are |
4435 | actually tsubst'd into the definition to create the | |
4436 | instantiation. */ | |
4437 | if (parm_depth > 1) | |
830bfa74 MM |
4438 | { |
4439 | /* We have multiple levels of arguments to coerce, at once. */ | |
830bfa74 | 4440 | int i; |
e4a84209 | 4441 | int saved_depth = TMPL_ARGS_DEPTH (arglist); |
36a117a5 | 4442 | |
f31c0a32 | 4443 | tree bound_args = make_tree_vec (parm_depth); |
830bfa74 | 4444 | |
e4a84209 | 4445 | for (i = saved_depth, |
830bfa74 | 4446 | t = DECL_TEMPLATE_PARMS (template); |
e4a84209 | 4447 | i > 0 && t != NULL_TREE; |
830bfa74 | 4448 | --i, t = TREE_CHAIN (t)) |
e4a84209 | 4449 | { |
ee3071ef NS |
4450 | tree a = coerce_template_parms (TREE_VALUE (t), |
4451 | arglist, template, | |
4452 | complain, /*require_all_args=*/1); | |
88e98cfe KL |
4453 | |
4454 | /* Don't process further if one of the levels fails. */ | |
4455 | if (a == error_mark_node) | |
4456 | { | |
4457 | /* Restore the ARGLIST to its full size. */ | |
4458 | TREE_VEC_LENGTH (arglist) = saved_depth; | |
4459 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
4460 | } | |
4461 | ||
e4a84209 MM |
4462 | SET_TMPL_ARGS_LEVEL (bound_args, i, a); |
4463 | ||
4464 | /* We temporarily reduce the length of the ARGLIST so | |
4465 | that coerce_template_parms will see only the arguments | |
4466 | corresponding to the template parameters it is | |
4467 | examining. */ | |
4468 | TREE_VEC_LENGTH (arglist)--; | |
4469 | } | |
4470 | ||
4471 | /* Restore the ARGLIST to its full size. */ | |
4472 | TREE_VEC_LENGTH (arglist) = saved_depth; | |
4473 | ||
36a117a5 | 4474 | arglist = bound_args; |
830bfa74 MM |
4475 | } |
4476 | else | |
36a117a5 MM |
4477 | arglist |
4478 | = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist), | |
f9a7ae04 | 4479 | INNERMOST_TEMPLATE_ARGS (arglist), |
f9c244b8 NS |
4480 | template, |
4481 | complain, /*require_all_args=*/1); | |
36a117a5 | 4482 | |
c353b8e3 | 4483 | if (arglist == error_mark_node) |
36a117a5 | 4484 | /* We were unable to bind the arguments. */ |
fd295cb2 | 4485 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); |
5566b478 | 4486 | |
36a117a5 MM |
4487 | /* In the scope of a template class, explicit references to the |
4488 | template class refer to the type of the template, not any | |
4489 | instantiation of it. For example, in: | |
4490 | ||
4491 | template <class T> class C { void f(C<T>); } | |
4492 | ||
4493 | the `C<T>' is just the same as `C'. Outside of the | |
4494 | class, however, such a reference is an instantiation. */ | |
ed44da02 | 4495 | if (comp_template_args (TYPE_TI_ARGS (template_type), |
36a117a5 MM |
4496 | arglist)) |
4497 | { | |
4498 | found = template_type; | |
4499 | ||
4500 | if (!entering_scope && PRIMARY_TEMPLATE_P (template)) | |
5566b478 | 4501 | { |
36a117a5 MM |
4502 | tree ctx; |
4503 | ||
36a117a5 | 4504 | for (ctx = current_class_type; |
5f04800c KL |
4505 | ctx && TREE_CODE (ctx) != NAMESPACE_DECL; |
4506 | ctx = (TYPE_P (ctx) | |
4507 | ? TYPE_CONTEXT (ctx) | |
4508 | : DECL_CONTEXT (ctx))) | |
4509 | if (TYPE_P (ctx) && same_type_p (ctx, template_type)) | |
4510 | goto found_ctx; | |
36a117a5 | 4511 | |
6df5158a NS |
4512 | /* We're not in the scope of the class, so the |
4513 | TEMPLATE_TYPE is not the type we want after all. */ | |
4514 | found = NULL_TREE; | |
4515 | found_ctx:; | |
5566b478 MS |
4516 | } |
4517 | } | |
36a117a5 | 4518 | if (found) |
fd295cb2 | 4519 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found); |
414ea4aa | 4520 | |
c7222c02 MM |
4521 | /* If we already have this specialization, return it. */ |
4522 | found = retrieve_specialization (template, arglist, | |
4523 | /*class_specializations_p=*/false); | |
4524 | if (found) | |
4525 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found); | |
5566b478 | 4526 | |
dbfe2124 | 4527 | /* This type is a "partial instantiation" if any of the template |
ab097535 | 4528 | arguments still involve template parameters. Note that we set |
486e4077 MM |
4529 | IS_PARTIAL_INSTANTIATION for partial specializations as |
4530 | well. */ | |
dbfe2124 MM |
4531 | is_partial_instantiation = uses_template_parms (arglist); |
4532 | ||
c353b8e3 MM |
4533 | /* If the deduced arguments are invalid, then the binding |
4534 | failed. */ | |
4535 | if (!is_partial_instantiation | |
4536 | && check_instantiated_args (template, | |
4537 | INNERMOST_TEMPLATE_ARGS (arglist), | |
4538 | complain)) | |
4539 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node); | |
4540 | ||
3ebc5c52 MM |
4541 | if (!is_partial_instantiation |
4542 | && !PRIMARY_TEMPLATE_P (template) | |
4543 | && TREE_CODE (CP_DECL_CONTEXT (template)) == NAMESPACE_DECL) | |
4544 | { | |
3ebc5c52 MM |
4545 | found = xref_tag_from_type (TREE_TYPE (template), |
4546 | DECL_NAME (template), | |
29ef83de | 4547 | /*tag_scope=*/ts_global); |
fd295cb2 | 4548 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found); |
3ebc5c52 | 4549 | } |
3ebc5c52 | 4550 | |
95ee998c | 4551 | context = tsubst (DECL_CONTEXT (template), arglist, |
c2ea3a40 | 4552 | complain, in_decl); |
95ee998c MM |
4553 | if (!context) |
4554 | context = global_namespace; | |
4555 | ||
36a117a5 | 4556 | /* Create the type. */ |
ed44da02 MM |
4557 | if (TREE_CODE (template_type) == ENUMERAL_TYPE) |
4558 | { | |
dbfe2124 | 4559 | if (!is_partial_instantiation) |
92777ce4 NS |
4560 | { |
4561 | set_current_access_from_decl (TYPE_NAME (template_type)); | |
4562 | t = start_enum (TYPE_IDENTIFIER (template_type)); | |
4563 | } | |
ed44da02 | 4564 | else |
dbfe2124 | 4565 | /* We don't want to call start_enum for this type, since |
ed44da02 MM |
4566 | the values for the enumeration constants may involve |
4567 | template parameters. And, no one should be interested | |
4568 | in the enumeration constants for such a type. */ | |
4569 | t = make_node (ENUMERAL_TYPE); | |
4570 | } | |
4571 | else | |
4572 | { | |
33848bb0 | 4573 | t = make_aggr_type (TREE_CODE (template_type)); |
ed44da02 MM |
4574 | CLASSTYPE_DECLARED_CLASS (t) |
4575 | = CLASSTYPE_DECLARED_CLASS (template_type); | |
ed44da02 | 4576 | SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t); |
f668f160 | 4577 | TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type); |
ae673f14 JM |
4578 | |
4579 | /* A local class. Make sure the decl gets registered properly. */ | |
4580 | if (context == current_function_decl) | |
4581 | pushtag (DECL_NAME (template), t, 0); | |
ed44da02 MM |
4582 | } |
4583 | ||
ae673f14 JM |
4584 | /* If we called start_enum or pushtag above, this information |
4585 | will already be set up. */ | |
ed44da02 MM |
4586 | if (!TYPE_NAME (t)) |
4587 | { | |
4588 | TYPE_CONTEXT (t) = FROB_CONTEXT (context); | |
36a117a5 | 4589 | |
9188c363 | 4590 | type_decl = create_implicit_typedef (DECL_NAME (template), t); |
ed44da02 | 4591 | DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t); |
9188c363 | 4592 | TYPE_STUB_DECL (t) = type_decl; |
f31686a3 RH |
4593 | DECL_SOURCE_LOCATION (type_decl) |
4594 | = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (template_type)); | |
ed44da02 MM |
4595 | } |
4596 | else | |
4597 | type_decl = TYPE_NAME (t); | |
36a117a5 | 4598 | |
cab7a9a3 KL |
4599 | TREE_PRIVATE (type_decl) |
4600 | = TREE_PRIVATE (TYPE_STUB_DECL (template_type)); | |
4601 | TREE_PROTECTED (type_decl) | |
4602 | = TREE_PROTECTED (TYPE_STUB_DECL (template_type)); | |
4603 | ||
9fbf56f7 MM |
4604 | /* Set up the template information. We have to figure out which |
4605 | template is the immediate parent if this is a full | |
4606 | instantiation. */ | |
4607 | if (parm_depth == 1 || is_partial_instantiation | |
4608 | || !PRIMARY_TEMPLATE_P (template)) | |
4609 | /* This case is easy; there are no member templates involved. */ | |
4610 | found = template; | |
4611 | else | |
4612 | { | |
ab097535 NS |
4613 | /* This is a full instantiation of a member template. Look |
4614 | for a partial instantiation of which this is an instance. */ | |
9fbf56f7 MM |
4615 | |
4616 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); | |
4617 | found; found = TREE_CHAIN (found)) | |
4618 | { | |
4619 | int success; | |
4620 | tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found)); | |
4621 | ||
4622 | /* We only want partial instantiations, here, not | |
4623 | specializations or full instantiations. */ | |
370af2d5 | 4624 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found)) |
9fbf56f7 MM |
4625 | || !uses_template_parms (TREE_VALUE (found))) |
4626 | continue; | |
4627 | ||
4628 | /* Temporarily reduce by one the number of levels in the | |
4629 | ARGLIST and in FOUND so as to avoid comparing the | |
4630 | last set of arguments. */ | |
4631 | TREE_VEC_LENGTH (arglist)--; | |
4632 | TREE_VEC_LENGTH (TREE_PURPOSE (found)) --; | |
4633 | ||
4634 | /* See if the arguments match. If they do, then TMPL is | |
4635 | the partial instantiation we want. */ | |
4636 | success = comp_template_args (TREE_PURPOSE (found), arglist); | |
4637 | ||
4638 | /* Restore the argument vectors to their full size. */ | |
4639 | TREE_VEC_LENGTH (arglist)++; | |
4640 | TREE_VEC_LENGTH (TREE_PURPOSE (found))++; | |
4641 | ||
4642 | if (success) | |
4643 | { | |
4644 | found = tmpl; | |
4645 | break; | |
4646 | } | |
4647 | } | |
4648 | ||
4649 | if (!found) | |
ab097535 NS |
4650 | { |
4651 | /* There was no partial instantiation. This happens | |
4652 | where C<T> is a member template of A<T> and it's used | |
4653 | in something like | |
4654 | ||
4655 | template <typename T> struct B { A<T>::C<int> m; }; | |
4656 | B<float>; | |
4657 | ||
4658 | Create the partial instantiation. | |
4659 | */ | |
4660 | TREE_VEC_LENGTH (arglist)--; | |
c2ea3a40 | 4661 | found = tsubst (template, arglist, complain, NULL_TREE); |
ab097535 | 4662 | TREE_VEC_LENGTH (arglist)++; |
ab097535 | 4663 | } |
9fbf56f7 MM |
4664 | } |
4665 | ||
ab097535 | 4666 | SET_TYPE_TEMPLATE_INFO (t, tree_cons (found, arglist, NULL_TREE)); |
dbfe2124 MM |
4667 | DECL_TEMPLATE_INSTANTIATIONS (template) |
4668 | = tree_cons (arglist, t, | |
4669 | DECL_TEMPLATE_INSTANTIATIONS (template)); | |
4670 | ||
4671 | if (TREE_CODE (t) == ENUMERAL_TYPE | |
4672 | && !is_partial_instantiation) | |
61a127b3 MM |
4673 | /* Now that the type has been registered on the instantiations |
4674 | list, we set up the enumerators. Because the enumeration | |
4675 | constants may involve the enumeration type itself, we make | |
4676 | sure to register the type first, and then create the | |
4677 | constants. That way, doing tsubst_expr for the enumeration | |
4678 | constants won't result in recursive calls here; we'll find | |
4679 | the instantiation and exit above. */ | |
4680 | tsubst_enum (template_type, t, arglist); | |
dbfe2124 | 4681 | |
36a117a5 MM |
4682 | /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO |
4683 | is set up. */ | |
ed44da02 MM |
4684 | if (TREE_CODE (t) != ENUMERAL_TYPE) |
4685 | DECL_NAME (type_decl) = classtype_mangled_name (t); | |
7813d14c | 4686 | if (is_partial_instantiation) |
077e7015 MM |
4687 | /* If the type makes use of template parameters, the |
4688 | code that generates debugging information will crash. */ | |
4689 | DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1; | |
8d08fdba | 4690 | |
fd295cb2 | 4691 | POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t); |
36a117a5 | 4692 | } |
fd295cb2 | 4693 | timevar_pop (TV_NAME_LOOKUP); |
8d08fdba MS |
4694 | } |
4695 | \f | |
8dfaeb63 | 4696 | struct pair_fn_data |
8d08fdba | 4697 | { |
8dfaeb63 MM |
4698 | tree_fn_t fn; |
4699 | void *data; | |
0c58f841 | 4700 | struct pointer_set_t *visited; |
8dfaeb63 MM |
4701 | }; |
4702 | ||
4703 | /* Called from for_each_template_parm via walk_tree. */ | |
581d38d0 | 4704 | |
8dfaeb63 | 4705 | static tree |
350fae66 | 4706 | for_each_template_parm_r (tree *tp, int *walk_subtrees, void *d) |
8dfaeb63 MM |
4707 | { |
4708 | tree t = *tp; | |
4709 | struct pair_fn_data *pfd = (struct pair_fn_data *) d; | |
4710 | tree_fn_t fn = pfd->fn; | |
4711 | void *data = pfd->data; | |
4f2c9d7e | 4712 | |
2f939d94 | 4713 | if (TYPE_P (t) |
4f2c9d7e | 4714 | && for_each_template_parm (TYPE_CONTEXT (t), fn, data, pfd->visited)) |
8dfaeb63 | 4715 | return error_mark_node; |
581d38d0 | 4716 | |
8d08fdba MS |
4717 | switch (TREE_CODE (t)) |
4718 | { | |
8d08fdba | 4719 | case RECORD_TYPE: |
9076e292 | 4720 | if (TYPE_PTRMEMFUNC_P (t)) |
8dfaeb63 | 4721 | break; |
ed44da02 MM |
4722 | /* Fall through. */ |
4723 | ||
8d08fdba | 4724 | case UNION_TYPE: |
ed44da02 | 4725 | case ENUMERAL_TYPE: |
8dfaeb63 MM |
4726 | if (!TYPE_TEMPLATE_INFO (t)) |
4727 | *walk_subtrees = 0; | |
4728 | else if (for_each_template_parm (TREE_VALUE (TYPE_TEMPLATE_INFO (t)), | |
4f2c9d7e | 4729 | fn, data, pfd->visited)) |
8dfaeb63 MM |
4730 | return error_mark_node; |
4731 | break; | |
4732 | ||
588c2d1c | 4733 | case METHOD_TYPE: |
8dfaeb63 MM |
4734 | /* Since we're not going to walk subtrees, we have to do this |
4735 | explicitly here. */ | |
4f2c9d7e MM |
4736 | if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data, |
4737 | pfd->visited)) | |
8dfaeb63 | 4738 | return error_mark_node; |
4890c2f4 | 4739 | /* Fall through. */ |
588c2d1c MM |
4740 | |
4741 | case FUNCTION_TYPE: | |
8dfaeb63 | 4742 | /* Check the return type. */ |
4f2c9d7e | 4743 | if (for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited)) |
8dfaeb63 MM |
4744 | return error_mark_node; |
4745 | ||
588c2d1c MM |
4746 | /* Check the parameter types. Since default arguments are not |
4747 | instantiated until they are needed, the TYPE_ARG_TYPES may | |
4748 | contain expressions that involve template parameters. But, | |
4749 | no-one should be looking at them yet. And, once they're | |
4750 | instantiated, they don't contain template parameters, so | |
4751 | there's no point in looking at them then, either. */ | |
4752 | { | |
4753 | tree parm; | |
4754 | ||
4755 | for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm)) | |
4f2c9d7e MM |
4756 | if (for_each_template_parm (TREE_VALUE (parm), fn, data, |
4757 | pfd->visited)) | |
8dfaeb63 | 4758 | return error_mark_node; |
5566b478 | 4759 | |
8dfaeb63 MM |
4760 | /* Since we've already handled the TYPE_ARG_TYPES, we don't |
4761 | want walk_tree walking into them itself. */ | |
4762 | *walk_subtrees = 0; | |
4763 | } | |
4764 | break; | |
3ac3d9ea | 4765 | |
a723baf1 MM |
4766 | case TYPEOF_TYPE: |
4767 | if (for_each_template_parm (TYPE_FIELDS (t), fn, data, | |
4768 | pfd->visited)) | |
4769 | return error_mark_node; | |
4770 | break; | |
4771 | ||
8d08fdba | 4772 | case FUNCTION_DECL: |
5566b478 | 4773 | case VAR_DECL: |
5566b478 | 4774 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t) |
4f2c9d7e MM |
4775 | && for_each_template_parm (DECL_TI_ARGS (t), fn, data, |
4776 | pfd->visited)) | |
8dfaeb63 MM |
4777 | return error_mark_node; |
4778 | /* Fall through. */ | |
4779 | ||
8d08fdba | 4780 | case PARM_DECL: |
a723baf1 MM |
4781 | case CONST_DECL: |
4782 | if (TREE_CODE (t) == CONST_DECL && DECL_TEMPLATE_PARM_P (t) | |
4783 | && for_each_template_parm (DECL_INITIAL (t), fn, data, | |
4784 | pfd->visited)) | |
4785 | return error_mark_node; | |
050367a3 | 4786 | if (DECL_CONTEXT (t) |
4f2c9d7e MM |
4787 | && for_each_template_parm (DECL_CONTEXT (t), fn, data, |
4788 | pfd->visited)) | |
8dfaeb63 MM |
4789 | return error_mark_node; |
4790 | break; | |
8d08fdba | 4791 | |
a1281f45 | 4792 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
744fac59 | 4793 | /* Record template parameters such as `T' inside `TT<T>'. */ |
4f2c9d7e | 4794 | if (for_each_template_parm (TYPE_TI_ARGS (t), fn, data, pfd->visited)) |
8dfaeb63 MM |
4795 | return error_mark_node; |
4796 | /* Fall through. */ | |
4797 | ||
a1281f45 | 4798 | case TEMPLATE_TEMPLATE_PARM: |
744fac59 | 4799 | case TEMPLATE_TYPE_PARM: |
f84b4be9 | 4800 | case TEMPLATE_PARM_INDEX: |
8dfaeb63 MM |
4801 | if (fn && (*fn)(t, data)) |
4802 | return error_mark_node; | |
4803 | else if (!fn) | |
4804 | return error_mark_node; | |
4805 | break; | |
5156628f | 4806 | |
8dfaeb63 | 4807 | case TEMPLATE_DECL: |
f4f206f4 | 4808 | /* A template template parameter is encountered. */ |
8dfaeb63 | 4809 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t) |
4f2c9d7e | 4810 | && for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited)) |
8dfaeb63 | 4811 | return error_mark_node; |
db5ae43f | 4812 | |
8dfaeb63 MM |
4813 | /* Already substituted template template parameter */ |
4814 | *walk_subtrees = 0; | |
4815 | break; | |
b8865407 | 4816 | |
4699c561 | 4817 | case TYPENAME_TYPE: |
4f2c9d7e MM |
4818 | if (!fn |
4819 | || for_each_template_parm (TYPENAME_TYPE_FULLNAME (t), fn, | |
4820 | data, pfd->visited)) | |
8dfaeb63 MM |
4821 | return error_mark_node; |
4822 | break; | |
4699c561 | 4823 | |
8dfaeb63 MM |
4824 | case CONSTRUCTOR: |
4825 | if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)) | |
4826 | && for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE | |
4f2c9d7e MM |
4827 | (TREE_TYPE (t)), fn, data, |
4828 | pfd->visited)) | |
8dfaeb63 MM |
4829 | return error_mark_node; |
4830 | break; | |
4831 | ||
b8865407 MM |
4832 | case INDIRECT_REF: |
4833 | case COMPONENT_REF: | |
4699c561 | 4834 | /* If there's no type, then this thing must be some expression |
b8865407 | 4835 | involving template parameters. */ |
4699c561 | 4836 | if (!fn && !TREE_TYPE (t)) |
8dfaeb63 MM |
4837 | return error_mark_node; |
4838 | break; | |
b8865407 | 4839 | |
42976354 BK |
4840 | case MODOP_EXPR: |
4841 | case CAST_EXPR: | |
4842 | case REINTERPRET_CAST_EXPR: | |
4843 | case CONST_CAST_EXPR: | |
4844 | case STATIC_CAST_EXPR: | |
4845 | case DYNAMIC_CAST_EXPR: | |
42976354 BK |
4846 | case ARROW_EXPR: |
4847 | case DOTSTAR_EXPR: | |
4848 | case TYPEID_EXPR: | |
40242ccf | 4849 | case PSEUDO_DTOR_EXPR: |
b8865407 | 4850 | if (!fn) |
8dfaeb63 MM |
4851 | return error_mark_node; |
4852 | break; | |
abff8e06 | 4853 | |
bd9bb3d2 MM |
4854 | case BASELINK: |
4855 | /* If we do not handle this case specially, we end up walking | |
4856 | the BINFO hierarchy, which is circular, and therefore | |
4857 | confuses walk_tree. */ | |
4858 | *walk_subtrees = 0; | |
4f2c9d7e MM |
4859 | if (for_each_template_parm (BASELINK_FUNCTIONS (*tp), fn, data, |
4860 | pfd->visited)) | |
bd9bb3d2 MM |
4861 | return error_mark_node; |
4862 | break; | |
4863 | ||
8d08fdba | 4864 | default: |
8dfaeb63 | 4865 | break; |
8d08fdba | 4866 | } |
8dfaeb63 MM |
4867 | |
4868 | /* We didn't find any template parameters we liked. */ | |
4869 | return NULL_TREE; | |
4870 | } | |
4871 | ||
a1281f45 KL |
4872 | /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM, |
4873 | BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T, | |
4874 | call FN with the parameter and the DATA. | |
838dfd8a | 4875 | If FN returns nonzero, the iteration is terminated, and |
8dfaeb63 | 4876 | for_each_template_parm returns 1. Otherwise, the iteration |
838dfd8a | 4877 | continues. If FN never returns a nonzero value, the value |
8dfaeb63 MM |
4878 | returned by for_each_template_parm is 0. If FN is NULL, it is |
4879 | considered to be the function which always returns 1. */ | |
4880 | ||
4881 | static int | |
0c58f841 MA |
4882 | for_each_template_parm (tree t, tree_fn_t fn, void* data, |
4883 | struct pointer_set_t *visited) | |
8dfaeb63 MM |
4884 | { |
4885 | struct pair_fn_data pfd; | |
ad2ae3b2 | 4886 | int result; |
8dfaeb63 MM |
4887 | |
4888 | /* Set up. */ | |
4889 | pfd.fn = fn; | |
4890 | pfd.data = data; | |
4891 | ||
4890c2f4 MM |
4892 | /* Walk the tree. (Conceptually, we would like to walk without |
4893 | duplicates, but for_each_template_parm_r recursively calls | |
4894 | for_each_template_parm, so we would need to reorganize a fair | |
4f2c9d7e MM |
4895 | bit to use walk_tree_without_duplicates, so we keep our own |
4896 | visited list.) */ | |
4897 | if (visited) | |
4898 | pfd.visited = visited; | |
4899 | else | |
0c58f841 | 4900 | pfd.visited = pointer_set_create (); |
ad2ae3b2 MM |
4901 | result = walk_tree (&t, |
4902 | for_each_template_parm_r, | |
4903 | &pfd, | |
c1e39976 | 4904 | pfd.visited) != NULL_TREE; |
ad2ae3b2 MM |
4905 | |
4906 | /* Clean up. */ | |
4907 | if (!visited) | |
0c58f841 MA |
4908 | { |
4909 | pointer_set_destroy (pfd.visited); | |
4910 | pfd.visited = 0; | |
4911 | } | |
ad2ae3b2 MM |
4912 | |
4913 | return result; | |
8d08fdba MS |
4914 | } |
4915 | ||
d43f603d KL |
4916 | /* Returns true if T depends on any template parameter. */ |
4917 | ||
050367a3 | 4918 | int |
3a978d72 | 4919 | uses_template_parms (tree t) |
050367a3 | 4920 | { |
c353b8e3 MM |
4921 | bool dependent_p; |
4922 | int saved_processing_template_decl; | |
4923 | ||
4924 | saved_processing_template_decl = processing_template_decl; | |
4925 | if (!saved_processing_template_decl) | |
4926 | processing_template_decl = 1; | |
4927 | if (TYPE_P (t)) | |
4928 | dependent_p = dependent_type_p (t); | |
4929 | else if (TREE_CODE (t) == TREE_VEC) | |
4930 | dependent_p = any_dependent_template_arguments_p (t); | |
4931 | else if (TREE_CODE (t) == TREE_LIST) | |
4932 | dependent_p = (uses_template_parms (TREE_VALUE (t)) | |
4933 | || uses_template_parms (TREE_CHAIN (t))); | |
4934 | else if (DECL_P (t) | |
4935 | || EXPR_P (t) | |
4936 | || TREE_CODE (t) == TEMPLATE_PARM_INDEX | |
4937 | || TREE_CODE (t) == OVERLOAD | |
4938 | || TREE_CODE (t) == BASELINK | |
6615c446 | 4939 | || CONSTANT_CLASS_P (t)) |
c353b8e3 MM |
4940 | dependent_p = (type_dependent_expression_p (t) |
4941 | || value_dependent_expression_p (t)); | |
315fb5db NS |
4942 | else |
4943 | { | |
4944 | gcc_assert (t == error_mark_node); | |
4945 | dependent_p = false; | |
4946 | } | |
4947 | ||
c353b8e3 MM |
4948 | processing_template_decl = saved_processing_template_decl; |
4949 | ||
4950 | return dependent_p; | |
050367a3 MM |
4951 | } |
4952 | ||
d43f603d KL |
4953 | /* Returns true if T depends on any template parameter with level LEVEL. */ |
4954 | ||
4955 | int | |
4956 | uses_template_parms_level (tree t, int level) | |
4957 | { | |
4958 | return for_each_template_parm (t, template_parm_this_level_p, &level, NULL); | |
4959 | } | |
4960 | ||
27fafc8d | 4961 | static int tinst_depth; |
e9f32eb5 | 4962 | extern int max_tinst_depth; |
5566b478 | 4963 | #ifdef GATHER_STATISTICS |
27fafc8d | 4964 | int depth_reached; |
5566b478 | 4965 | #endif |
8dfaeb63 MM |
4966 | static int tinst_level_tick; |
4967 | static int last_template_error_tick; | |
8d08fdba | 4968 | |
3ae18eaf JM |
4969 | /* We're starting to instantiate D; record the template instantiation context |
4970 | for diagnostics and to restore it later. */ | |
4971 | ||
742a37d5 | 4972 | int |
3a978d72 | 4973 | push_tinst_level (tree d) |
8d08fdba | 4974 | { |
3ae18eaf | 4975 | tree new; |
8d08fdba | 4976 | |
7215f9a0 MS |
4977 | if (tinst_depth >= max_tinst_depth) |
4978 | { | |
8adf5b5e JM |
4979 | /* If the instantiation in question still has unbound template parms, |
4980 | we don't really care if we can't instantiate it, so just return. | |
4981 | This happens with base instantiation for implicit `typename'. */ | |
4982 | if (uses_template_parms (d)) | |
4983 | return 0; | |
4984 | ||
1139b3d8 | 4985 | last_template_error_tick = tinst_level_tick; |
0f51ccfc GDR |
4986 | error ("template instantiation depth exceeds maximum of %d (use " |
4987 | "-ftemplate-depth-NN to increase the maximum) instantiating %qD", | |
b4f4233d | 4988 | max_tinst_depth, d); |
5566b478 | 4989 | |
cb753e49 | 4990 | print_instantiation_context (); |
5566b478 | 4991 | |
7215f9a0 MS |
4992 | return 0; |
4993 | } | |
4994 | ||
406d77a4 | 4995 | new = make_tinst_level (d, input_location); |
3ae18eaf | 4996 | TREE_CHAIN (new) = current_tinst_level; |
8d08fdba | 4997 | current_tinst_level = new; |
5566b478 | 4998 | |
7215f9a0 | 4999 | ++tinst_depth; |
5566b478 MS |
5000 | #ifdef GATHER_STATISTICS |
5001 | if (tinst_depth > depth_reached) | |
5002 | depth_reached = tinst_depth; | |
5003 | #endif | |
5004 | ||
27fafc8d | 5005 | ++tinst_level_tick; |
7215f9a0 | 5006 | return 1; |
8d08fdba MS |
5007 | } |
5008 | ||
3ae18eaf JM |
5009 | /* We're done instantiating this template; return to the instantiation |
5010 | context. */ | |
5011 | ||
8d08fdba | 5012 | void |
3a978d72 | 5013 | pop_tinst_level (void) |
8d08fdba | 5014 | { |
3ae18eaf | 5015 | tree old = current_tinst_level; |
8d08fdba | 5016 | |
ae58fa02 MM |
5017 | /* Restore the filename and line number stashed away when we started |
5018 | this instantiation. */ | |
406d77a4 | 5019 | input_location = TINST_LOCATION (old); |
3ae18eaf | 5020 | current_tinst_level = TREE_CHAIN (old); |
7215f9a0 | 5021 | --tinst_depth; |
27fafc8d | 5022 | ++tinst_level_tick; |
8d08fdba MS |
5023 | } |
5024 | ||
3ae18eaf JM |
5025 | /* We're instantiating a deferred template; restore the template |
5026 | instantiation context in which the instantiation was requested, which | |
5027 | is one step out from LEVEL. */ | |
5028 | ||
5029 | static void | |
3a978d72 | 5030 | reopen_tinst_level (tree level) |
3ae18eaf JM |
5031 | { |
5032 | tree t; | |
5033 | ||
5034 | tinst_depth = 0; | |
5035 | for (t = level; t; t = TREE_CHAIN (t)) | |
5036 | ++tinst_depth; | |
5037 | ||
5038 | current_tinst_level = level; | |
5039 | pop_tinst_level (); | |
5040 | } | |
5041 | ||
f84b4be9 JM |
5042 | /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the |
5043 | vector of template arguments, as for tsubst. | |
5044 | ||
dc957d14 | 5045 | Returns an appropriate tsubst'd friend declaration. */ |
f84b4be9 JM |
5046 | |
5047 | static tree | |
3a978d72 | 5048 | tsubst_friend_function (tree decl, tree args) |
f84b4be9 JM |
5049 | { |
5050 | tree new_friend; | |
27fafc8d | 5051 | |
f84b4be9 JM |
5052 | if (TREE_CODE (decl) == FUNCTION_DECL |
5053 | && DECL_TEMPLATE_INSTANTIATION (decl) | |
5054 | && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) | |
5055 | /* This was a friend declared with an explicit template | |
5056 | argument list, e.g.: | |
5057 | ||
5058 | friend void f<>(T); | |
5059 | ||
5060 | to indicate that f was a template instantiation, not a new | |
5061 | function declaration. Now, we have to figure out what | |
5062 | instantiation of what template. */ | |
5063 | { | |
76e57b45 | 5064 | tree template_id, arglist, fns; |
f84b4be9 JM |
5065 | tree new_args; |
5066 | tree tmpl; | |
ed2fa432 | 5067 | tree ns = decl_namespace_context (TYPE_MAIN_DECL (current_class_type)); |
76e57b45 NS |
5068 | |
5069 | /* Friend functions are looked up in the containing namespace scope. | |
5070 | We must enter that scope, to avoid finding member functions of the | |
5071 | current cless with same name. */ | |
5072 | push_nested_namespace (ns); | |
5073 | fns = tsubst_expr (DECL_TI_TEMPLATE (decl), args, | |
c2ea3a40 | 5074 | tf_error | tf_warning, NULL_TREE); |
76e57b45 NS |
5075 | pop_nested_namespace (ns); |
5076 | arglist = tsubst (DECL_TI_ARGS (decl), args, | |
c2ea3a40 | 5077 | tf_error | tf_warning, NULL_TREE); |
76e57b45 NS |
5078 | template_id = lookup_template_function (fns, arglist); |
5079 | ||
c2ea3a40 | 5080 | new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE); |
36a117a5 MM |
5081 | tmpl = determine_specialization (template_id, new_friend, |
5082 | &new_args, | |
5fe7b654 GB |
5083 | /*need_member_template=*/0, |
5084 | TREE_VEC_LENGTH (args)); | |
6e432b31 | 5085 | return instantiate_template (tmpl, new_args, tf_error); |
f84b4be9 | 5086 | } |
36a117a5 | 5087 | |
c2ea3a40 | 5088 | new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE); |
f84b4be9 | 5089 | |
36a117a5 | 5090 | /* The NEW_FRIEND will look like an instantiation, to the |
f84b4be9 JM |
5091 | compiler, but is not an instantiation from the point of view of |
5092 | the language. For example, we might have had: | |
5093 | ||
5094 | template <class T> struct S { | |
5095 | template <class U> friend void f(T, U); | |
5096 | }; | |
5097 | ||
5098 | Then, in S<int>, template <class U> void f(int, U) is not an | |
5099 | instantiation of anything. */ | |
ac2b3222 AP |
5100 | if (new_friend == error_mark_node) |
5101 | return error_mark_node; | |
5102 | ||
f84b4be9 JM |
5103 | DECL_USE_TEMPLATE (new_friend) = 0; |
5104 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
655dc6ee JM |
5105 | { |
5106 | DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0; | |
5107 | DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend)) | |
5108 | = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl)); | |
5109 | } | |
36a117a5 | 5110 | |
92643fea MM |
5111 | /* The mangled name for the NEW_FRIEND is incorrect. The function |
5112 | is not a template instantiation and should not be mangled like | |
5113 | one. Therefore, we forget the mangling here; we'll recompute it | |
5114 | later if we need it. */ | |
36a117a5 MM |
5115 | if (TREE_CODE (new_friend) != TEMPLATE_DECL) |
5116 | { | |
19e7881c | 5117 | SET_DECL_RTL (new_friend, NULL_RTX); |
92643fea | 5118 | SET_DECL_ASSEMBLER_NAME (new_friend, NULL_TREE); |
36a117a5 MM |
5119 | } |
5120 | ||
6eb3bb27 | 5121 | if (DECL_NAMESPACE_SCOPE_P (new_friend)) |
f84b4be9 | 5122 | { |
36a117a5 | 5123 | tree old_decl; |
fbf1c34b MM |
5124 | tree new_friend_template_info; |
5125 | tree new_friend_result_template_info; | |
92da7074 | 5126 | tree ns; |
fbf1c34b MM |
5127 | int new_friend_is_defn; |
5128 | ||
5129 | /* We must save some information from NEW_FRIEND before calling | |
5130 | duplicate decls since that function will free NEW_FRIEND if | |
5131 | possible. */ | |
5132 | new_friend_template_info = DECL_TEMPLATE_INFO (new_friend); | |
5bd61841 MM |
5133 | new_friend_is_defn = |
5134 | (DECL_INITIAL (DECL_TEMPLATE_RESULT | |
5135 | (template_for_substitution (new_friend))) | |
5136 | != NULL_TREE); | |
f84b4be9 | 5137 | if (TREE_CODE (new_friend) == TEMPLATE_DECL) |
fbf1c34b MM |
5138 | { |
5139 | /* This declaration is a `primary' template. */ | |
5140 | DECL_PRIMARY_TEMPLATE (new_friend) = new_friend; | |
5141 | ||
fbf1c34b | 5142 | new_friend_result_template_info |
17aec3eb | 5143 | = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend)); |
fbf1c34b MM |
5144 | } |
5145 | else | |
5bd61841 | 5146 | new_friend_result_template_info = NULL_TREE; |
36a117a5 | 5147 | |
1c227897 MM |
5148 | /* Inside pushdecl_namespace_level, we will push into the |
5149 | current namespace. However, the friend function should go | |
c6002625 | 5150 | into the namespace of the template. */ |
92da7074 ML |
5151 | ns = decl_namespace_context (new_friend); |
5152 | push_nested_namespace (ns); | |
36a117a5 | 5153 | old_decl = pushdecl_namespace_level (new_friend); |
92da7074 | 5154 | pop_nested_namespace (ns); |
36a117a5 MM |
5155 | |
5156 | if (old_decl != new_friend) | |
5157 | { | |
5158 | /* This new friend declaration matched an existing | |
5159 | declaration. For example, given: | |
5160 | ||
5161 | template <class T> void f(T); | |
5162 | template <class U> class C { | |
5163 | template <class T> friend void f(T) {} | |
5164 | }; | |
5165 | ||
5166 | the friend declaration actually provides the definition | |
5167 | of `f', once C has been instantiated for some type. So, | |
5168 | old_decl will be the out-of-class template declaration, | |
5169 | while new_friend is the in-class definition. | |
5170 | ||
5171 | But, if `f' was called before this point, the | |
5172 | instantiation of `f' will have DECL_TI_ARGS corresponding | |
5173 | to `T' but not to `U', references to which might appear | |
5174 | in the definition of `f'. Previously, the most general | |
5175 | template for an instantiation of `f' was the out-of-class | |
5176 | version; now it is the in-class version. Therefore, we | |
5177 | run through all specialization of `f', adding to their | |
5178 | DECL_TI_ARGS appropriately. In particular, they need a | |
5179 | new set of outer arguments, corresponding to the | |
5180 | arguments for this class instantiation. | |
5181 | ||
5182 | The same situation can arise with something like this: | |
5183 | ||
5184 | friend void f(int); | |
5185 | template <class T> class C { | |
5186 | friend void f(T) {} | |
5187 | }; | |
5188 | ||
5189 | when `C<int>' is instantiated. Now, `f(int)' is defined | |
5190 | in the class. */ | |
5191 | ||
fbf1c34b MM |
5192 | if (!new_friend_is_defn) |
5193 | /* On the other hand, if the in-class declaration does | |
5194 | *not* provide a definition, then we don't want to alter | |
5195 | existing definitions. We can just leave everything | |
5196 | alone. */ | |
36a117a5 | 5197 | ; |
fbf1c34b | 5198 | else |
36a117a5 | 5199 | { |
fbf1c34b MM |
5200 | /* Overwrite whatever template info was there before, if |
5201 | any, with the new template information pertaining to | |
5202 | the declaration. */ | |
5203 | DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info; | |
5204 | ||
5205 | if (TREE_CODE (old_decl) != TEMPLATE_DECL) | |
8d83f792 MM |
5206 | reregister_specialization (new_friend, |
5207 | most_general_template (old_decl), | |
5208 | old_decl); | |
fbf1c34b | 5209 | else |
36a117a5 | 5210 | { |
fbf1c34b MM |
5211 | tree t; |
5212 | tree new_friend_args; | |
5213 | ||
17aec3eb | 5214 | DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl)) |
fbf1c34b MM |
5215 | = new_friend_result_template_info; |
5216 | ||
5217 | new_friend_args = TI_ARGS (new_friend_template_info); | |
5218 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl); | |
5219 | t != NULL_TREE; | |
5220 | t = TREE_CHAIN (t)) | |
5221 | { | |
5222 | tree spec = TREE_VALUE (t); | |
36a117a5 | 5223 | |
fbf1c34b MM |
5224 | DECL_TI_ARGS (spec) |
5225 | = add_outermost_template_args (new_friend_args, | |
5226 | DECL_TI_ARGS (spec)); | |
fbf1c34b MM |
5227 | } |
5228 | ||
5229 | /* Now, since specializations are always supposed to | |
5230 | hang off of the most general template, we must move | |
5231 | them. */ | |
5232 | t = most_general_template (old_decl); | |
5233 | if (t != old_decl) | |
5234 | { | |
5235 | DECL_TEMPLATE_SPECIALIZATIONS (t) | |
5236 | = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t), | |
5237 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl)); | |
5238 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE; | |
5239 | } | |
36a117a5 MM |
5240 | } |
5241 | } | |
5242 | ||
5243 | /* The information from NEW_FRIEND has been merged into OLD_DECL | |
5244 | by duplicate_decls. */ | |
5245 | new_friend = old_decl; | |
5246 | } | |
f84b4be9 | 5247 | } |
6e432b31 | 5248 | else |
f84b4be9 | 5249 | { |
6e432b31 KL |
5250 | tree context = DECL_CONTEXT (new_friend); |
5251 | bool dependent_p; | |
5252 | ||
5253 | /* In the code | |
5254 | template <class T> class C { | |
5255 | template <class U> friend void C1<U>::f (); // case 1 | |
5256 | friend void C2<T>::f (); // case 2 | |
5257 | }; | |
5258 | we only need to make sure CONTEXT is a complete type for | |
5259 | case 2. To distinguish between the two cases, we note that | |
5260 | CONTEXT of case 1 remains dependent type after tsubst while | |
5261 | this isn't true for case 2. */ | |
5262 | ++processing_template_decl; | |
5263 | dependent_p = dependent_type_p (context); | |
5264 | --processing_template_decl; | |
5265 | ||
5266 | if (!dependent_p | |
5267 | && !complete_type_or_else (context, NULL_TREE)) | |
5268 | return error_mark_node; | |
5269 | ||
5270 | if (COMPLETE_TYPE_P (context)) | |
5271 | { | |
5272 | /* Check to see that the declaration is really present, and, | |
5273 | possibly obtain an improved declaration. */ | |
5274 | tree fn = check_classfn (context, | |
5275 | new_friend, NULL_TREE); | |
5276 | ||
5277 | if (fn) | |
5278 | new_friend = fn; | |
5279 | } | |
f84b4be9 JM |
5280 | } |
5281 | ||
5282 | return new_friend; | |
5283 | } | |
5284 | ||
1aed5355 MM |
5285 | /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of |
5286 | template arguments, as for tsubst. | |
6757edfe | 5287 | |
dc957d14 | 5288 | Returns an appropriate tsubst'd friend type or error_mark_node on |
4b054b80 | 5289 | failure. */ |
6757edfe MM |
5290 | |
5291 | static tree | |
3a978d72 | 5292 | tsubst_friend_class (tree friend_tmpl, tree args) |
6757edfe | 5293 | { |
1aed5355 | 5294 | tree friend_type; |
25aab5d0 | 5295 | tree tmpl; |
3e0ec82f | 5296 | tree context; |
6757edfe | 5297 | |
3e0ec82f MM |
5298 | context = DECL_CONTEXT (friend_tmpl); |
5299 | ||
5300 | if (context) | |
77adef84 | 5301 | { |
3e0ec82f MM |
5302 | if (TREE_CODE (context) == NAMESPACE_DECL) |
5303 | push_nested_namespace (context); | |
5304 | else | |
14d22dd6 | 5305 | push_nested_class (tsubst (context, args, tf_none, NULL_TREE)); |
3e0ec82f | 5306 | } |
25aab5d0 | 5307 | |
3e0ec82f MM |
5308 | /* First, we look for a class template. */ |
5309 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/0); | |
25aab5d0 | 5310 | |
3e0ec82f MM |
5311 | /* But, if we don't find one, it might be because we're in a |
5312 | situation like this: | |
77adef84 | 5313 | |
3e0ec82f MM |
5314 | template <class T> |
5315 | struct S { | |
5316 | template <class U> | |
5317 | friend struct S; | |
5318 | }; | |
5319 | ||
5320 | Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL | |
5321 | for `S<int>', not the TEMPLATE_DECL. */ | |
5322 | if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl)) | |
5323 | { | |
5324 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/1); | |
5325 | tmpl = maybe_get_template_decl_from_type_decl (tmpl); | |
25aab5d0 | 5326 | } |
6757edfe | 5327 | |
25aab5d0 | 5328 | if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl)) |
6757edfe MM |
5329 | { |
5330 | /* The friend template has already been declared. Just | |
36a117a5 MM |
5331 | check to see that the declarations match, and install any new |
5332 | default parameters. We must tsubst the default parameters, | |
5333 | of course. We only need the innermost template parameters | |
5334 | because that is all that redeclare_class_template will look | |
5335 | at. */ | |
3e0ec82f MM |
5336 | if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl)) |
5337 | > TMPL_ARGS_DEPTH (args)) | |
5338 | { | |
5339 | tree parms; | |
5340 | parms = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl), | |
5341 | args, tf_error | tf_warning); | |
5342 | redeclare_class_template (TREE_TYPE (tmpl), parms); | |
5343 | } | |
5344 | ||
6757edfe MM |
5345 | friend_type = TREE_TYPE (tmpl); |
5346 | } | |
5347 | else | |
5348 | { | |
5349 | /* The friend template has not already been declared. In this | |
5350 | case, the instantiation of the template class will cause the | |
5351 | injection of this template into the global scope. */ | |
c2ea3a40 | 5352 | tmpl = tsubst (friend_tmpl, args, tf_error | tf_warning, NULL_TREE); |
6757edfe MM |
5353 | |
5354 | /* The new TMPL is not an instantiation of anything, so we | |
5355 | forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for | |
5356 | the new type because that is supposed to be the corresponding | |
5357 | template decl, i.e., TMPL. */ | |
5358 | DECL_USE_TEMPLATE (tmpl) = 0; | |
5359 | DECL_TEMPLATE_INFO (tmpl) = NULL_TREE; | |
5360 | CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0; | |
68c78847 KL |
5361 | CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl)) |
5362 | = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl))); | |
6757edfe MM |
5363 | |
5364 | /* Inject this template into the global scope. */ | |
5365 | friend_type = TREE_TYPE (pushdecl_top_level (tmpl)); | |
5366 | } | |
5367 | ||
3e0ec82f MM |
5368 | if (context) |
5369 | { | |
5370 | if (TREE_CODE (context) == NAMESPACE_DECL) | |
5371 | pop_nested_namespace (context); | |
5372 | else | |
5373 | pop_nested_class (); | |
5374 | } | |
5375 | ||
6757edfe MM |
5376 | return friend_type; |
5377 | } | |
f84b4be9 | 5378 | |
17f29637 KL |
5379 | /* Returns zero if TYPE cannot be completed later due to circularity. |
5380 | Otherwise returns one. */ | |
5381 | ||
d5372501 | 5382 | static int |
3a978d72 | 5383 | can_complete_type_without_circularity (tree type) |
17f29637 KL |
5384 | { |
5385 | if (type == NULL_TREE || type == error_mark_node) | |
5386 | return 0; | |
5387 | else if (COMPLETE_TYPE_P (type)) | |
5388 | return 1; | |
5389 | else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type)) | |
5390 | return can_complete_type_without_circularity (TREE_TYPE (type)); | |
8c6ab2db NS |
5391 | else if (CLASS_TYPE_P (type) |
5392 | && TYPE_BEING_DEFINED (TYPE_MAIN_VARIANT (type))) | |
17f29637 KL |
5393 | return 0; |
5394 | else | |
5395 | return 1; | |
5396 | } | |
5397 | ||
8d08fdba | 5398 | tree |
3a978d72 | 5399 | instantiate_class_template (tree type) |
8d08fdba | 5400 | { |
7088fca9 | 5401 | tree template, args, pattern, t, member; |
36a117a5 | 5402 | tree typedecl; |
dbbf88d1 | 5403 | tree pbinfo; |
cad7e87b | 5404 | tree base_list; |
dbbf88d1 | 5405 | |
5566b478 | 5406 | if (type == error_mark_node) |
8d08fdba MS |
5407 | return error_mark_node; |
5408 | ||
ca099ac8 MM |
5409 | if (TYPE_BEING_DEFINED (type) |
5410 | || COMPLETE_TYPE_P (type) | |
5411 | || dependent_type_p (type)) | |
5566b478 MS |
5412 | return type; |
5413 | ||
6bdb985f | 5414 | /* Figure out which template is being instantiated. */ |
36a117a5 | 5415 | template = most_general_template (CLASSTYPE_TI_TEMPLATE (type)); |
50bc768d | 5416 | gcc_assert (TREE_CODE (template) == TEMPLATE_DECL); |
73aad9b9 | 5417 | |
6bdb985f MM |
5418 | /* Figure out which arguments are being used to do the |
5419 | instantiation. */ | |
5420 | args = CLASSTYPE_TI_ARGS (type); | |
4c571114 MM |
5421 | |
5422 | /* Determine what specialization of the original template to | |
5423 | instantiate. */ | |
8fbc5ae7 MM |
5424 | t = most_specialized_class (template, args); |
5425 | if (t == error_mark_node) | |
73aad9b9 | 5426 | { |
8fbc5ae7 | 5427 | const char *str = "candidates are:"; |
0f51ccfc | 5428 | error ("ambiguous class template instantiation for %q#T", type); |
8fbc5ae7 MM |
5429 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t; |
5430 | t = TREE_CHAIN (t)) | |
73aad9b9 | 5431 | { |
8c6ab2db | 5432 | if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args)) |
73aad9b9 | 5433 | { |
8fbc5ae7 MM |
5434 | cp_error_at ("%s %+#T", str, TREE_TYPE (t)); |
5435 | str = " "; | |
73aad9b9 JM |
5436 | } |
5437 | } | |
8fbc5ae7 MM |
5438 | TYPE_BEING_DEFINED (type) = 1; |
5439 | return error_mark_node; | |
73aad9b9 | 5440 | } |
6bdb985f MM |
5441 | |
5442 | if (t) | |
73aad9b9 JM |
5443 | pattern = TREE_TYPE (t); |
5444 | else | |
5445 | pattern = TREE_TYPE (template); | |
5566b478 | 5446 | |
4c571114 MM |
5447 | /* If the template we're instantiating is incomplete, then clearly |
5448 | there's nothing we can do. */ | |
d0f062fb | 5449 | if (!COMPLETE_TYPE_P (pattern)) |
f31c0a32 | 5450 | return type; |
5566b478 | 5451 | |
4c571114 MM |
5452 | /* If we've recursively instantiated too many templates, stop. */ |
5453 | if (! push_tinst_level (type)) | |
f31c0a32 | 5454 | return type; |
4c571114 MM |
5455 | |
5456 | /* Now we're really doing the instantiation. Mark the type as in | |
5457 | the process of being defined. */ | |
5458 | TYPE_BEING_DEFINED (type) = 1; | |
5459 | ||
78757caa KL |
5460 | /* We may be in the middle of deferred access check. Disable |
5461 | it now. */ | |
5462 | push_deferring_access_checks (dk_no_deferred); | |
5463 | ||
c353b8e3 | 5464 | push_to_top_level (); |
4c571114 | 5465 | |
73aad9b9 | 5466 | if (t) |
36a117a5 | 5467 | { |
27631dae | 5468 | /* This TYPE is actually an instantiation of a partial |
36a117a5 MM |
5469 | specialization. We replace the innermost set of ARGS with |
5470 | the arguments appropriate for substitution. For example, | |
5471 | given: | |
5472 | ||
5473 | template <class T> struct S {}; | |
5474 | template <class T> struct S<T*> {}; | |
5475 | ||
5476 | and supposing that we are instantiating S<int*>, ARGS will | |
5477 | present be {int*} but we need {int}. */ | |
5478 | tree inner_args | |
5479 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), | |
5480 | args); | |
5481 | ||
5482 | /* If there were multiple levels in ARGS, replacing the | |
5483 | innermost level would alter CLASSTYPE_TI_ARGS, which we don't | |
5484 | want, so we make a copy first. */ | |
5485 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args)) | |
5486 | { | |
5487 | args = copy_node (args); | |
5488 | SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args); | |
5489 | } | |
5490 | else | |
5491 | args = inner_args; | |
5492 | } | |
8d019cef | 5493 | |
7813d14c | 5494 | SET_CLASSTYPE_INTERFACE_UNKNOWN (type); |
8d08fdba | 5495 | |
68ea098a NS |
5496 | /* Set the input location to the template definition. This is needed |
5497 | if tsubsting causes an error. */ | |
f31686a3 | 5498 | input_location = DECL_SOURCE_LOCATION (TYPE_NAME (pattern)); |
68ea098a | 5499 | |
f7da6097 | 5500 | TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern); |
834c6dff MM |
5501 | TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern); |
5502 | TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern); | |
f7da6097 | 5503 | TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern); |
f7da6097 MS |
5504 | TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern); |
5505 | TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern); | |
f7da6097 MS |
5506 | TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern); |
5507 | TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern); | |
f7da6097 MS |
5508 | TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern); |
5509 | TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern); | |
f7da6097 MS |
5510 | TYPE_PACKED (type) = TYPE_PACKED (pattern); |
5511 | TYPE_ALIGN (type) = TYPE_ALIGN (pattern); | |
11cf4d18 | 5512 | TYPE_USER_ALIGN (type) = TYPE_USER_ALIGN (pattern); |
eff71ab0 | 5513 | TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */ |
6bdb8141 JM |
5514 | if (ANON_AGGR_TYPE_P (pattern)) |
5515 | SET_ANON_AGGR_TYPE_P (type); | |
f7da6097 | 5516 | |
dbbf88d1 | 5517 | pbinfo = TYPE_BINFO (pattern); |
1456deaf | 5518 | |
315fb5db NS |
5519 | /* We should never instantiate a nested class before its enclosing |
5520 | class; we need to look up the nested class by name before we can | |
5521 | instantiate it, and that lookup should instantiate the enclosing | |
5522 | class. */ | |
5523 | gcc_assert (!DECL_CLASS_SCOPE_P (TYPE_MAIN_DECL (pattern)) | |
5524 | || COMPLETE_TYPE_P (TYPE_CONTEXT (type)) | |
5525 | || TYPE_BEING_DEFINED (TYPE_CONTEXT (type))); | |
1456deaf | 5526 | |
cad7e87b | 5527 | base_list = NULL_TREE; |
fa743e8c | 5528 | if (BINFO_N_BASE_BINFOS (pbinfo)) |
3fd71a52 | 5529 | { |
fa743e8c | 5530 | tree pbase_binfo; |
a2507277 | 5531 | tree context = TYPE_CONTEXT (type); |
4514aa8c | 5532 | tree pushed_scope; |
3fd71a52 | 5533 | int i; |
5566b478 | 5534 | |
a2507277 NS |
5535 | /* We must enter the scope containing the type, as that is where |
5536 | the accessibility of types named in dependent bases are | |
5537 | looked up from. */ | |
4514aa8c | 5538 | pushed_scope = push_scope (context ? context : global_namespace); |
a2507277 | 5539 | |
3fd71a52 MM |
5540 | /* Substitute into each of the bases to determine the actual |
5541 | basetypes. */ | |
fa743e8c | 5542 | for (i = 0; BINFO_BASE_ITERATE (pbinfo, i, pbase_binfo); i++) |
3fd71a52 MM |
5543 | { |
5544 | tree base; | |
fa743e8c | 5545 | tree access = BINFO_BASE_ACCESS (pbinfo, i); |
711734a9 | 5546 | |
dc957d14 | 5547 | /* Substitute to figure out the base class. */ |
fa743e8c | 5548 | base = tsubst (BINFO_TYPE (pbase_binfo), args, tf_error, NULL_TREE); |
3fd71a52 MM |
5549 | if (base == error_mark_node) |
5550 | continue; | |
dbbf88d1 | 5551 | |
3fd71a52 | 5552 | base_list = tree_cons (access, base, base_list); |
fa743e8c | 5553 | if (BINFO_VIRTUAL_P (pbase_binfo)) |
809e3e7f | 5554 | TREE_TYPE (base_list) = integer_type_node; |
3fd71a52 | 5555 | } |
dfbcd65a | 5556 | |
3fd71a52 MM |
5557 | /* The list is now in reverse order; correct that. */ |
5558 | base_list = nreverse (base_list); | |
5559 | ||
4514aa8c NS |
5560 | if (pushed_scope) |
5561 | pop_scope (pushed_scope); | |
3fd71a52 | 5562 | } |
cad7e87b NS |
5563 | /* Now call xref_basetypes to set up all the base-class |
5564 | information. */ | |
5565 | xref_basetypes (type, base_list); | |
5566 | ||
5566b478 | 5567 | |
b74a0560 MM |
5568 | /* Now that our base classes are set up, enter the scope of the |
5569 | class, so that name lookups into base classes, etc. will work | |
dc957d14 | 5570 | correctly. This is precisely analogous to what we do in |
b74a0560 MM |
5571 | begin_class_definition when defining an ordinary non-template |
5572 | class. */ | |
29370796 | 5573 | pushclass (type); |
b74a0560 | 5574 | |
7088fca9 | 5575 | /* Now members are processed in the order of declaration. */ |
8c6ab2db NS |
5576 | for (member = CLASSTYPE_DECL_LIST (pattern); |
5577 | member; member = TREE_CHAIN (member)) | |
8d08fdba | 5578 | { |
7088fca9 | 5579 | tree t = TREE_VALUE (member); |
5566b478 | 5580 | |
7088fca9 | 5581 | if (TREE_PURPOSE (member)) |
ed44da02 | 5582 | { |
7088fca9 KL |
5583 | if (TYPE_P (t)) |
5584 | { | |
5e0c54e5 | 5585 | /* Build new CLASSTYPE_NESTED_UTDS. */ |
8d08fdba | 5586 | |
7088fca9 KL |
5587 | tree tag = t; |
5588 | tree name = TYPE_IDENTIFIER (tag); | |
5589 | tree newtag; | |
883a2bff MM |
5590 | bool class_template_p; |
5591 | ||
5592 | class_template_p = (TREE_CODE (tag) != ENUMERAL_TYPE | |
5593 | && TYPE_LANG_SPECIFIC (tag) | |
5594 | && CLASSTYPE_IS_TEMPLATE (tag)); | |
5595 | /* If the member is a class template, then -- even after | |
6c745393 | 5596 | substitution -- there may be dependent types in the |
883a2bff MM |
5597 | template argument list for the class. We increment |
5598 | PROCESSING_TEMPLATE_DECL so that dependent_type_p, as | |
5599 | that function will assume that no types are dependent | |
5600 | when outside of a template. */ | |
5601 | if (class_template_p) | |
5602 | ++processing_template_decl; | |
7088fca9 | 5603 | newtag = tsubst (tag, args, tf_error, NULL_TREE); |
883a2bff MM |
5604 | if (class_template_p) |
5605 | --processing_template_decl; | |
2620d095 KL |
5606 | if (newtag == error_mark_node) |
5607 | continue; | |
5608 | ||
7088fca9 KL |
5609 | if (TREE_CODE (newtag) != ENUMERAL_TYPE) |
5610 | { | |
883a2bff | 5611 | if (class_template_p) |
7088fca9 KL |
5612 | /* Unfortunately, lookup_template_class sets |
5613 | CLASSTYPE_IMPLICIT_INSTANTIATION for a partial | |
3afd2e20 NS |
5614 | instantiation (i.e., for the type of a member |
5615 | template class nested within a template class.) | |
5616 | This behavior is required for | |
5617 | maybe_process_partial_specialization to work | |
5618 | correctly, but is not accurate in this case; | |
5619 | the TAG is not an instantiation of anything. | |
5620 | (The corresponding TEMPLATE_DECL is an | |
5621 | instantiation, but the TYPE is not.) */ | |
7088fca9 KL |
5622 | CLASSTYPE_USE_TEMPLATE (newtag) = 0; |
5623 | ||
5624 | /* Now, we call pushtag to put this NEWTAG into the scope of | |
5625 | TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid | |
5626 | pushtag calling push_template_decl. We don't have to do | |
5627 | this for enums because it will already have been done in | |
5628 | tsubst_enum. */ | |
5629 | if (name) | |
5630 | SET_IDENTIFIER_TYPE_VALUE (name, newtag); | |
5631 | pushtag (name, newtag, /*globalize=*/0); | |
5632 | } | |
5633 | } | |
5634 | else if (TREE_CODE (t) == FUNCTION_DECL | |
5635 | || DECL_FUNCTION_TEMPLATE_P (t)) | |
5636 | { | |
5637 | /* Build new TYPE_METHODS. */ | |
fecafe5e NS |
5638 | tree r; |
5639 | ||
5640 | if (TREE_CODE (t) == TEMPLATE_DECL) | |
9579624e | 5641 | ++processing_template_decl; |
fecafe5e NS |
5642 | r = tsubst (t, args, tf_error, NULL_TREE); |
5643 | if (TREE_CODE (t) == TEMPLATE_DECL) | |
9579624e | 5644 | --processing_template_decl; |
7088fca9 KL |
5645 | set_current_access_from_decl (r); |
5646 | grok_special_member_properties (r); | |
5647 | finish_member_declaration (r); | |
5648 | } | |
5649 | else | |
5650 | { | |
5651 | /* Build new TYPE_FIELDS. */ | |
fa8d6e85 | 5652 | |
7088fca9 KL |
5653 | if (TREE_CODE (t) != CONST_DECL) |
5654 | { | |
5655 | tree r; | |
fa8d6e85 | 5656 | |
d479d37f NS |
5657 | /* The the file and line for this declaration, to |
5658 | assist in error message reporting. Since we | |
5659 | called push_tinst_level above, we don't need to | |
5660 | restore these. */ | |
f31686a3 | 5661 | input_location = DECL_SOURCE_LOCATION (t); |
fa8d6e85 | 5662 | |
fb5ce3c9 | 5663 | if (TREE_CODE (t) == TEMPLATE_DECL) |
9579624e | 5664 | ++processing_template_decl; |
7088fca9 | 5665 | r = tsubst (t, args, tf_error | tf_warning, NULL_TREE); |
fb5ce3c9 | 5666 | if (TREE_CODE (t) == TEMPLATE_DECL) |
9579624e | 5667 | --processing_template_decl; |
7088fca9 KL |
5668 | if (TREE_CODE (r) == VAR_DECL) |
5669 | { | |
5670 | tree init; | |
17f29637 | 5671 | |
7088fca9 KL |
5672 | if (DECL_INITIALIZED_IN_CLASS_P (r)) |
5673 | init = tsubst_expr (DECL_INITIAL (t), args, | |
5674 | tf_error | tf_warning, NULL_TREE); | |
5675 | else | |
5676 | init = NULL_TREE; | |
8d08fdba | 5677 | |
8c6ab2db NS |
5678 | finish_static_data_member_decl |
5679 | (r, init, /*asmspec_tree=*/NULL_TREE, /*flags=*/0); | |
8d08fdba | 5680 | |
7088fca9 KL |
5681 | if (DECL_INITIALIZED_IN_CLASS_P (r)) |
5682 | check_static_variable_definition (r, TREE_TYPE (r)); | |
5683 | } | |
5684 | else if (TREE_CODE (r) == FIELD_DECL) | |
5685 | { | |
5686 | /* Determine whether R has a valid type and can be | |
5687 | completed later. If R is invalid, then it is | |
5688 | replaced by error_mark_node so that it will not be | |
5689 | added to TYPE_FIELDS. */ | |
5690 | tree rtype = TREE_TYPE (r); | |
5691 | if (can_complete_type_without_circularity (rtype)) | |
5692 | complete_type (rtype); | |
5693 | ||
5694 | if (!COMPLETE_TYPE_P (rtype)) | |
5695 | { | |
5696 | cxx_incomplete_type_error (r, rtype); | |
5697 | r = error_mark_node; | |
5698 | } | |
5699 | } | |
5566b478 | 5700 | |
7088fca9 KL |
5701 | /* If it is a TYPE_DECL for a class-scoped ENUMERAL_TYPE, |
5702 | such a thing will already have been added to the field | |
5703 | list by tsubst_enum in finish_member_declaration in the | |
5e0c54e5 | 5704 | CLASSTYPE_NESTED_UTDS case above. */ |
7088fca9 KL |
5705 | if (!(TREE_CODE (r) == TYPE_DECL |
5706 | && TREE_CODE (TREE_TYPE (r)) == ENUMERAL_TYPE | |
43b26a01 | 5707 | && DECL_ARTIFICIAL (r))) |
7088fca9 KL |
5708 | { |
5709 | set_current_access_from_decl (r); | |
5710 | finish_member_declaration (r); | |
5711 | } | |
5712 | } | |
5713 | } | |
61fc8c9e | 5714 | } |
7088fca9 KL |
5715 | else |
5716 | { | |
5717 | if (TYPE_P (t) || DECL_CLASS_TEMPLATE_P (t)) | |
5718 | { | |
5719 | /* Build new CLASSTYPE_FRIEND_CLASSES. */ | |
5720 | ||
5721 | tree friend_type = t; | |
b939a023 | 5722 | bool adjust_processing_template_decl = false; |
1aed5355 | 5723 | |
7088fca9 | 5724 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
b939a023 KL |
5725 | { |
5726 | friend_type = tsubst_friend_class (friend_type, args); | |
5727 | adjust_processing_template_decl = true; | |
5728 | } | |
5729 | else if (TREE_CODE (friend_type) == UNBOUND_CLASS_TEMPLATE) | |
5730 | { | |
5731 | friend_type = tsubst (friend_type, args, | |
5732 | tf_error | tf_warning, NULL_TREE); | |
5733 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) | |
5734 | friend_type = TREE_TYPE (friend_type); | |
5735 | adjust_processing_template_decl = true; | |
5736 | } | |
5737 | else if (TREE_CODE (friend_type) == TYPENAME_TYPE) | |
5738 | { | |
5739 | friend_type = tsubst (friend_type, args, | |
5740 | tf_error | tf_warning, NULL_TREE); | |
5741 | /* Bump processing_template_decl for correct | |
5742 | dependent_type_p calculation. */ | |
5743 | ++processing_template_decl; | |
5744 | if (dependent_type_p (friend_type)) | |
5745 | adjust_processing_template_decl = true; | |
5746 | --processing_template_decl; | |
5747 | } | |
7088fca9 | 5748 | else if (uses_template_parms (friend_type)) |
b939a023 KL |
5749 | friend_type = tsubst (friend_type, args, |
5750 | tf_error | tf_warning, NULL_TREE); | |
c4d0910c | 5751 | else if (CLASSTYPE_USE_TEMPLATE (friend_type)) |
b939a023 | 5752 | friend_type = friend_type; |
7088fca9 KL |
5753 | else |
5754 | { | |
5755 | tree ns = decl_namespace_context (TYPE_MAIN_DECL (friend_type)); | |
5756 | ||
5757 | /* The call to xref_tag_from_type does injection for friend | |
5758 | classes. */ | |
5759 | push_nested_namespace (ns); | |
b939a023 | 5760 | friend_type = |
29ef83de KL |
5761 | xref_tag_from_type (friend_type, NULL_TREE, |
5762 | /*tag_scope=*/ts_global); | |
7088fca9 KL |
5763 | pop_nested_namespace (ns); |
5764 | } | |
1aed5355 | 5765 | |
b939a023 | 5766 | if (adjust_processing_template_decl) |
7088fca9 KL |
5767 | /* Trick make_friend_class into realizing that the friend |
5768 | we're adding is a template, not an ordinary class. It's | |
5769 | important that we use make_friend_class since it will | |
5770 | perform some error-checking and output cross-reference | |
5771 | information. */ | |
5772 | ++processing_template_decl; | |
fc378698 | 5773 | |
b939a023 KL |
5774 | if (friend_type != error_mark_node) |
5775 | make_friend_class (type, friend_type, /*complain=*/false); | |
fc378698 | 5776 | |
b939a023 | 5777 | if (adjust_processing_template_decl) |
7088fca9 KL |
5778 | --processing_template_decl; |
5779 | } | |
5780 | else | |
9579624e KL |
5781 | { |
5782 | /* Build new DECL_FRIENDLIST. */ | |
5783 | tree r; | |
5784 | ||
6e432b31 KL |
5785 | /* The the file and line for this declaration, to |
5786 | assist in error message reporting. Since we | |
5787 | called push_tinst_level above, we don't need to | |
5788 | restore these. */ | |
5789 | input_location = DECL_SOURCE_LOCATION (t); | |
5790 | ||
9579624e | 5791 | if (TREE_CODE (t) == TEMPLATE_DECL) |
cad7e87b NS |
5792 | { |
5793 | ++processing_template_decl; | |
5794 | push_deferring_access_checks (dk_no_check); | |
5795 | } | |
5796 | ||
9579624e | 5797 | r = tsubst_friend_function (t, args); |
9579624e | 5798 | add_friend (type, r, /*complain=*/false); |
cad7e87b NS |
5799 | if (TREE_CODE (t) == TEMPLATE_DECL) |
5800 | { | |
5801 | pop_deferring_access_checks (); | |
5802 | --processing_template_decl; | |
5803 | } | |
9579624e | 5804 | } |
7088fca9 KL |
5805 | } |
5806 | } | |
5566b478 | 5807 | |
61a127b3 MM |
5808 | /* Set the file and line number information to whatever is given for |
5809 | the class itself. This puts error messages involving generated | |
5810 | implicit functions at a predictable point, and the same point | |
5811 | that would be used for non-template classes. */ | |
7088fca9 | 5812 | typedecl = TYPE_MAIN_DECL (type); |
f31686a3 | 5813 | input_location = DECL_SOURCE_LOCATION (typedecl); |
6de9cd9a | 5814 | |
61a127b3 | 5815 | unreverse_member_declarations (type); |
9f33663b | 5816 | finish_struct_1 (type); |
5524676d | 5817 | TYPE_BEING_DEFINED (type) = 0; |
8d08fdba | 5818 | |
9188c363 MM |
5819 | /* Now that the class is complete, instantiate default arguments for |
5820 | any member functions. We don't do this earlier because the | |
5821 | default arguments may reference members of the class. */ | |
5822 | if (!PRIMARY_TEMPLATE_P (template)) | |
5823 | for (t = TYPE_METHODS (type); t; t = TREE_CHAIN (t)) | |
5824 | if (TREE_CODE (t) == FUNCTION_DECL | |
dc957d14 | 5825 | /* Implicitly generated member functions will not have template |
9188c363 MM |
5826 | information; they are not instantiations, but instead are |
5827 | created "fresh" for each instantiation. */ | |
5828 | && DECL_TEMPLATE_INFO (t)) | |
5829 | tsubst_default_arguments (t); | |
5830 | ||
b74a0560 | 5831 | popclass (); |
5566b478 | 5832 | pop_from_top_level (); |
78757caa | 5833 | pop_deferring_access_checks (); |
5566b478 MS |
5834 | pop_tinst_level (); |
5835 | ||
4684cd27 MM |
5836 | /* The vtable for a template class can be emitted in any translation |
5837 | unit in which the class is instantiated. When there is no key | |
5838 | method, however, finish_struct_1 will already have added TYPE to | |
5839 | the keyed_classes list. */ | |
5840 | if (TYPE_CONTAINS_VPTR_P (type) && CLASSTYPE_KEY_METHOD (type)) | |
9aad8f83 MA |
5841 | keyed_classes = tree_cons (NULL_TREE, type, keyed_classes); |
5842 | ||
5566b478 | 5843 | return type; |
8d08fdba MS |
5844 | } |
5845 | ||
00d3396f | 5846 | static tree |
a91db711 | 5847 | tsubst_template_arg (tree t, tree args, tsubst_flags_t complain, tree in_decl) |
00d3396f | 5848 | { |
a91db711 NS |
5849 | tree r; |
5850 | ||
5851 | if (!t) | |
5852 | r = t; | |
5853 | else if (TYPE_P (t)) | |
5854 | r = tsubst (t, args, complain, in_decl); | |
5855 | else | |
00d3396f | 5856 | { |
a91db711 NS |
5857 | r = tsubst_expr (t, args, complain, in_decl); |
5858 | ||
5859 | if (!uses_template_parms (r)) | |
4d5f3fbd | 5860 | { |
a91db711 NS |
5861 | /* Sometimes, one of the args was an expression involving a |
5862 | template constant parameter, like N - 1. Now that we've | |
5863 | tsubst'd, we might have something like 2 - 1. This will | |
5864 | confuse lookup_template_class, so we do constant folding | |
5865 | here. We have to unset processing_template_decl, to fool | |
5866 | tsubst_copy_and_build() into building an actual tree. */ | |
5867 | ||
5868 | /* If the TREE_TYPE of ARG is not NULL_TREE, ARG is already | |
5869 | as simple as it's going to get, and trying to reprocess | |
5870 | the trees will break. Once tsubst_expr et al DTRT for | |
5871 | non-dependent exprs, this code can go away, as the type | |
5872 | will always be set. */ | |
5873 | if (!TREE_TYPE (r)) | |
5874 | { | |
5875 | int saved_processing_template_decl = processing_template_decl; | |
5876 | processing_template_decl = 0; | |
5877 | r = tsubst_copy_and_build (r, /*args=*/NULL_TREE, | |
5878 | tf_error, /*in_decl=*/NULL_TREE, | |
5879 | /*function_p=*/false); | |
5880 | processing_template_decl = saved_processing_template_decl; | |
5881 | } | |
5882 | r = fold (r); | |
4d5f3fbd | 5883 | } |
bd83b409 | 5884 | } |
a91db711 | 5885 | return r; |
bd83b409 NS |
5886 | } |
5887 | ||
a91db711 | 5888 | /* Substitute ARGS into the vector or list of template arguments T. */ |
830bfa74 | 5889 | |
e9659ab0 | 5890 | static tree |
a91db711 | 5891 | tsubst_template_args (tree t, tree args, tsubst_flags_t complain, tree in_decl) |
830bfa74 | 5892 | { |
bf12d54d | 5893 | int len = TREE_VEC_LENGTH (t); |
a91db711 | 5894 | int need_new = 0, i; |
c68b0a84 | 5895 | tree *elts = alloca (len * sizeof (tree)); |
830bfa74 | 5896 | |
830bfa74 MM |
5897 | for (i = 0; i < len; i++) |
5898 | { | |
bf12d54d NS |
5899 | tree orig_arg = TREE_VEC_ELT (t, i); |
5900 | tree new_arg; | |
a91db711 | 5901 | |
bf12d54d NS |
5902 | if (TREE_CODE (orig_arg) == TREE_VEC) |
5903 | new_arg = tsubst_template_args (orig_arg, args, complain, in_decl); | |
830bfa74 | 5904 | else |
a91db711 | 5905 | new_arg = tsubst_template_arg (orig_arg, args, complain, in_decl); |
830bfa74 | 5906 | |
a91db711 | 5907 | if (new_arg == error_mark_node) |
08e72a19 JM |
5908 | return error_mark_node; |
5909 | ||
a91db711 NS |
5910 | elts[i] = new_arg; |
5911 | if (new_arg != orig_arg) | |
830bfa74 MM |
5912 | need_new = 1; |
5913 | } | |
5914 | ||
5915 | if (!need_new) | |
5916 | return t; | |
a91db711 | 5917 | |
bf12d54d NS |
5918 | t = make_tree_vec (len); |
5919 | for (i = 0; i < len; i++) | |
5920 | TREE_VEC_ELT (t, i) = elts[i]; | |
830bfa74 MM |
5921 | |
5922 | return t; | |
5923 | } | |
5924 | ||
36a117a5 MM |
5925 | /* Return the result of substituting ARGS into the template parameters |
5926 | given by PARMS. If there are m levels of ARGS and m + n levels of | |
5927 | PARMS, then the result will contain n levels of PARMS. For | |
5928 | example, if PARMS is `template <class T> template <class U> | |
5929 | template <T*, U, class V>' and ARGS is {{int}, {double}} then the | |
5930 | result will be `template <int*, double, class V>'. */ | |
5931 | ||
e9659ab0 | 5932 | static tree |
3a978d72 | 5933 | tsubst_template_parms (tree parms, tree args, tsubst_flags_t complain) |
36a117a5 | 5934 | { |
f71f87f9 MM |
5935 | tree r = NULL_TREE; |
5936 | tree* new_parms; | |
36a117a5 MM |
5937 | |
5938 | for (new_parms = &r; | |
5939 | TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args); | |
5940 | new_parms = &(TREE_CHAIN (*new_parms)), | |
5941 | parms = TREE_CHAIN (parms)) | |
5942 | { | |
5943 | tree new_vec = | |
5944 | make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms))); | |
5945 | int i; | |
5946 | ||
5947 | for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i) | |
5948 | { | |
833aa4c4 NS |
5949 | tree tuple = TREE_VEC_ELT (TREE_VALUE (parms), i); |
5950 | tree default_value = TREE_PURPOSE (tuple); | |
5951 | tree parm_decl = TREE_VALUE (tuple); | |
5952 | ||
5953 | parm_decl = tsubst (parm_decl, args, complain, NULL_TREE); | |
a91db711 NS |
5954 | default_value = tsubst_template_arg (default_value, args, |
5955 | complain, NULL_TREE); | |
5956 | ||
5957 | tuple = build_tree_list (default_value, parm_decl); | |
833aa4c4 | 5958 | TREE_VEC_ELT (new_vec, i) = tuple; |
36a117a5 MM |
5959 | } |
5960 | ||
5961 | *new_parms = | |
4890c2f4 MM |
5962 | tree_cons (size_int (TMPL_PARMS_DEPTH (parms) |
5963 | - TMPL_ARGS_DEPTH (args)), | |
36a117a5 MM |
5964 | new_vec, NULL_TREE); |
5965 | } | |
5966 | ||
5967 | return r; | |
5968 | } | |
5969 | ||
ed44da02 MM |
5970 | /* Substitute the ARGS into the indicated aggregate (or enumeration) |
5971 | type T. If T is not an aggregate or enumeration type, it is | |
5972 | handled as if by tsubst. IN_DECL is as for tsubst. If | |
838dfd8a | 5973 | ENTERING_SCOPE is nonzero, T is the context for a template which |
dc957d14 | 5974 | we are presently tsubst'ing. Return the substituted value. */ |
36a117a5 | 5975 | |
e9659ab0 | 5976 | static tree |
3a978d72 NN |
5977 | tsubst_aggr_type (tree t, |
5978 | tree args, | |
5979 | tsubst_flags_t complain, | |
5980 | tree in_decl, | |
5981 | int entering_scope) | |
36a117a5 MM |
5982 | { |
5983 | if (t == NULL_TREE) | |
5984 | return NULL_TREE; | |
5985 | ||
5986 | switch (TREE_CODE (t)) | |
5987 | { | |
5988 | case RECORD_TYPE: | |
5989 | if (TYPE_PTRMEMFUNC_P (t)) | |
46c895ac | 5990 | return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl); |
36a117a5 | 5991 | |
f4f206f4 | 5992 | /* Else fall through. */ |
ed44da02 | 5993 | case ENUMERAL_TYPE: |
36a117a5 | 5994 | case UNION_TYPE: |
5db698f6 | 5995 | if (TYPE_TEMPLATE_INFO (t)) |
36a117a5 MM |
5996 | { |
5997 | tree argvec; | |
5998 | tree context; | |
5999 | tree r; | |
6000 | ||
6001 | /* First, determine the context for the type we are looking | |
6002 | up. */ | |
4f7847ca NS |
6003 | context = TYPE_CONTEXT (t); |
6004 | if (context) | |
6005 | context = tsubst_aggr_type (context, args, complain, | |
36a117a5 | 6006 | in_decl, /*entering_scope=*/1); |
36a117a5 MM |
6007 | |
6008 | /* Then, figure out what arguments are appropriate for the | |
6009 | type we are trying to find. For example, given: | |
6010 | ||
6011 | template <class T> struct S; | |
6012 | template <class T, class U> void f(T, U) { S<U> su; } | |
6013 | ||
6014 | and supposing that we are instantiating f<int, double>, | |
6015 | then our ARGS will be {int, double}, but, when looking up | |
6016 | S we only want {double}. */ | |
a91db711 NS |
6017 | argvec = tsubst_template_args (TYPE_TI_ARGS (t), args, |
6018 | complain, in_decl); | |
08e72a19 JM |
6019 | if (argvec == error_mark_node) |
6020 | return error_mark_node; | |
36a117a5 MM |
6021 | |
6022 | r = lookup_template_class (t, argvec, in_decl, context, | |
f9c244b8 | 6023 | entering_scope, complain); |
36a117a5 | 6024 | |
c2ea3a40 | 6025 | return cp_build_qualified_type_real (r, TYPE_QUALS (t), complain); |
36a117a5 MM |
6026 | } |
6027 | else | |
6028 | /* This is not a template type, so there's nothing to do. */ | |
6029 | return t; | |
6030 | ||
6031 | default: | |
4393e105 | 6032 | return tsubst (t, args, complain, in_decl); |
36a117a5 MM |
6033 | } |
6034 | } | |
6035 | ||
9188c363 MM |
6036 | /* Substitute into the default argument ARG (a default argument for |
6037 | FN), which has the indicated TYPE. */ | |
6038 | ||
6039 | tree | |
3a978d72 | 6040 | tsubst_default_argument (tree fn, tree type, tree arg) |
9188c363 | 6041 | { |
2436b51f MM |
6042 | tree saved_class_ptr = NULL_TREE; |
6043 | tree saved_class_ref = NULL_TREE; | |
6044 | ||
9188c363 MM |
6045 | /* This default argument came from a template. Instantiate the |
6046 | default argument here, not in tsubst. In the case of | |
6047 | something like: | |
6048 | ||
6049 | template <class T> | |
6050 | struct S { | |
6051 | static T t(); | |
6052 | void f(T = t()); | |
6053 | }; | |
6054 | ||
6055 | we must be careful to do name lookup in the scope of S<T>, | |
d5a10cf0 | 6056 | rather than in the current class. */ |
2b59fc25 | 6057 | push_access_scope (fn); |
c6671cbb MM |
6058 | /* The default argument expression should not be considered to be |
6059 | within the scope of FN. Since push_access_scope sets | |
6060 | current_function_decl, we must explicitly clear it here. */ | |
6061 | current_function_decl = NULL_TREE; | |
2436b51f MM |
6062 | /* The "this" pointer is not valid in a default argument. */ |
6063 | if (cfun) | |
6064 | { | |
6065 | saved_class_ptr = current_class_ptr; | |
6066 | cp_function_chain->x_current_class_ptr = NULL_TREE; | |
6067 | saved_class_ref = current_class_ref; | |
6068 | cp_function_chain->x_current_class_ref = NULL_TREE; | |
6069 | } | |
9188c363 | 6070 | |
d5a10cf0 | 6071 | push_deferring_access_checks(dk_no_deferred); |
c2ea3a40 NS |
6072 | arg = tsubst_expr (arg, DECL_TI_ARGS (fn), |
6073 | tf_error | tf_warning, NULL_TREE); | |
d5a10cf0 MM |
6074 | pop_deferring_access_checks(); |
6075 | ||
2436b51f MM |
6076 | /* Restore the "this" pointer. */ |
6077 | if (cfun) | |
6078 | { | |
6079 | cp_function_chain->x_current_class_ptr = saved_class_ptr; | |
6080 | cp_function_chain->x_current_class_ref = saved_class_ref; | |
6081 | } | |
6082 | ||
2b59fc25 | 6083 | pop_access_scope (fn); |
9188c363 MM |
6084 | |
6085 | /* Make sure the default argument is reasonable. */ | |
6086 | arg = check_default_argument (type, arg); | |
6087 | ||
6088 | return arg; | |
6089 | } | |
6090 | ||
6091 | /* Substitute into all the default arguments for FN. */ | |
6092 | ||
6093 | static void | |
3a978d72 | 6094 | tsubst_default_arguments (tree fn) |
9188c363 MM |
6095 | { |
6096 | tree arg; | |
6097 | tree tmpl_args; | |
6098 | ||
6099 | tmpl_args = DECL_TI_ARGS (fn); | |
6100 | ||
6101 | /* If this function is not yet instantiated, we certainly don't need | |
6102 | its default arguments. */ | |
6103 | if (uses_template_parms (tmpl_args)) | |
6104 | return; | |
6105 | ||
6106 | for (arg = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
6107 | arg; | |
6108 | arg = TREE_CHAIN (arg)) | |
6109 | if (TREE_PURPOSE (arg)) | |
6110 | TREE_PURPOSE (arg) = tsubst_default_argument (fn, | |
6111 | TREE_VALUE (arg), | |
6112 | TREE_PURPOSE (arg)); | |
6113 | } | |
6114 | ||
fc6a28d7 MM |
6115 | /* Substitute the ARGS into the T, which is a _DECL. Return the |
6116 | result of the substitution. Issue error and warning messages under | |
6117 | control of COMPLAIN. */ | |
00d3396f | 6118 | |
e9659ab0 | 6119 | static tree |
fc6a28d7 | 6120 | tsubst_decl (tree t, tree args, tsubst_flags_t complain) |
8d08fdba | 6121 | { |
82a98427 | 6122 | location_t saved_loc; |
b370501f | 6123 | tree r = NULL_TREE; |
4b2811e9 | 6124 | tree in_decl = t; |
830bfa74 | 6125 | |
ae58fa02 | 6126 | /* Set the filename and linenumber to improve error-reporting. */ |
82a98427 | 6127 | saved_loc = input_location; |
f31686a3 | 6128 | input_location = DECL_SOURCE_LOCATION (t); |
b7484fbe | 6129 | |
8d08fdba MS |
6130 | switch (TREE_CODE (t)) |
6131 | { | |
98c1c668 JM |
6132 | case TEMPLATE_DECL: |
6133 | { | |
28e42b7e KL |
6134 | /* We can get here when processing a member function template, |
6135 | member class template, and template template parameter of | |
6136 | a template class. */ | |
98c1c668 | 6137 | tree decl = DECL_TEMPLATE_RESULT (t); |
386b8a85 | 6138 | tree spec; |
28e42b7e KL |
6139 | tree tmpl_args; |
6140 | tree full_args; | |
98c1c668 | 6141 | |
28e42b7e | 6142 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t)) |
db2767b6 | 6143 | { |
28e42b7e KL |
6144 | /* Template template parameter is treated here. */ |
6145 | tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
6146 | if (new_type == error_mark_node) | |
6147 | return error_mark_node; | |
36a117a5 | 6148 | |
28e42b7e KL |
6149 | r = copy_decl (t); |
6150 | TREE_CHAIN (r) = NULL_TREE; | |
6151 | TREE_TYPE (r) = new_type; | |
6152 | DECL_TEMPLATE_RESULT (r) | |
6153 | = build_decl (TYPE_DECL, DECL_NAME (decl), new_type); | |
6154 | DECL_TEMPLATE_PARMS (r) | |
6155 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args, | |
6156 | complain); | |
6157 | TYPE_NAME (new_type) = r; | |
6158 | break; | |
6159 | } | |
36a117a5 | 6160 | |
28e42b7e KL |
6161 | /* We might already have an instance of this template. |
6162 | The ARGS are for the surrounding class type, so the | |
6163 | full args contain the tsubst'd args for the context, | |
6164 | plus the innermost args from the template decl. */ | |
6165 | tmpl_args = DECL_CLASS_TEMPLATE_P (t) | |
6166 | ? CLASSTYPE_TI_ARGS (TREE_TYPE (t)) | |
6167 | : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t)); | |
6168 | full_args = tsubst_template_args (tmpl_args, args, | |
6169 | complain, in_decl); | |
6170 | ||
6171 | /* tsubst_template_args doesn't copy the vector if | |
6172 | nothing changed. But, *something* should have | |
6173 | changed. */ | |
6174 | gcc_assert (full_args != tmpl_args); | |
6175 | ||
6176 | spec = retrieve_specialization (t, full_args, | |
6177 | /*class_specializations_p=*/true); | |
6178 | if (spec != NULL_TREE) | |
6179 | { | |
6180 | r = spec; | |
6181 | break; | |
db2767b6 | 6182 | } |
98c1c668 JM |
6183 | |
6184 | /* Make a new template decl. It will be similar to the | |
6185 | original, but will record the current template arguments. | |
6186 | We also create a new function declaration, which is just | |
6187 | like the old one, but points to this new template, rather | |
6188 | than the old one. */ | |
0acf7199 | 6189 | r = copy_decl (t); |
50bc768d | 6190 | gcc_assert (DECL_LANG_SPECIFIC (r) != 0); |
ae58fa02 | 6191 | TREE_CHAIN (r) = NULL_TREE; |
db2767b6 | 6192 | |
ae58fa02 | 6193 | DECL_CONTEXT (r) |
4f1c5b7d | 6194 | = tsubst_aggr_type (DECL_CONTEXT (t), args, |
c2ea3a40 | 6195 | complain, in_decl, |
4393e105 | 6196 | /*entering_scope=*/1); |
ae58fa02 | 6197 | DECL_TEMPLATE_INFO (r) = build_tree_list (t, args); |
93cdc044 JM |
6198 | |
6199 | if (TREE_CODE (decl) == TYPE_DECL) | |
6200 | { | |
c2ea3a40 | 6201 | tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
2620d095 KL |
6202 | if (new_type == error_mark_node) |
6203 | return error_mark_node; | |
6204 | ||
ae58fa02 MM |
6205 | TREE_TYPE (r) = new_type; |
6206 | CLASSTYPE_TI_TEMPLATE (new_type) = r; | |
17aec3eb | 6207 | DECL_TEMPLATE_RESULT (r) = TYPE_MAIN_DECL (new_type); |
ae58fa02 | 6208 | DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type); |
93cdc044 JM |
6209 | } |
6210 | else | |
6211 | { | |
c2ea3a40 | 6212 | tree new_decl = tsubst (decl, args, complain, in_decl); |
caec1dc0 KL |
6213 | if (new_decl == error_mark_node) |
6214 | return error_mark_node; | |
17aec3eb RK |
6215 | |
6216 | DECL_TEMPLATE_RESULT (r) = new_decl; | |
ae58fa02 MM |
6217 | DECL_TI_TEMPLATE (new_decl) = r; |
6218 | TREE_TYPE (r) = TREE_TYPE (new_decl); | |
6219 | DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl); | |
93cdc044 JM |
6220 | } |
6221 | ||
ae58fa02 MM |
6222 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
6223 | DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE; | |
6224 | DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE; | |
98c1c668 JM |
6225 | |
6226 | /* The template parameters for this new template are all the | |
6227 | template parameters for the old template, except the | |
c6002625 | 6228 | outermost level of parameters. */ |
ae58fa02 | 6229 | DECL_TEMPLATE_PARMS (r) |
4393e105 | 6230 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args, |
c2ea3a40 | 6231 | complain); |
98c1c668 | 6232 | |
93cdc044 | 6233 | if (PRIMARY_TEMPLATE_P (t)) |
ae58fa02 | 6234 | DECL_PRIMARY_TEMPLATE (r) = r; |
93cdc044 | 6235 | |
8c6ab2db NS |
6236 | if (TREE_CODE (decl) != TYPE_DECL) |
6237 | /* Record this non-type partial instantiation. */ | |
6238 | register_specialization (r, t, | |
6239 | DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r))); | |
98c1c668 | 6240 | } |
ae58fa02 | 6241 | break; |
8d08fdba MS |
6242 | |
6243 | case FUNCTION_DECL: | |
6244 | { | |
386b8a85 | 6245 | tree ctx; |
87603ed0 | 6246 | tree argvec = NULL_TREE; |
cf38f48a | 6247 | tree *friends; |
36a117a5 | 6248 | tree gen_tmpl; |
fc6a28d7 | 6249 | tree type; |
5566b478 | 6250 | int member; |
d8c4447d MM |
6251 | int args_depth; |
6252 | int parms_depth; | |
5566b478 | 6253 | |
36a117a5 | 6254 | /* Nobody should be tsubst'ing into non-template functions. */ |
50bc768d | 6255 | gcc_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE); |
36a117a5 MM |
6256 | |
6257 | if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL) | |
6258 | { | |
6259 | tree spec; | |
00cf3e31 MM |
6260 | bool dependent_p; |
6261 | ||
6262 | /* If T is not dependent, just return it. We have to | |
6263 | increment PROCESSING_TEMPLATE_DECL because | |
6264 | value_dependent_expression_p assumes that nothing is | |
6265 | dependent when PROCESSING_TEMPLATE_DECL is zero. */ | |
6266 | ++processing_template_decl; | |
6267 | dependent_p = value_dependent_expression_p (t); | |
6268 | --processing_template_decl; | |
6269 | if (!dependent_p) | |
6270 | return t; | |
36a117a5 MM |
6271 | |
6272 | /* Calculate the most general template of which R is a | |
6273 | specialization, and the complete set of arguments used to | |
6274 | specialize R. */ | |
6275 | gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t)); | |
a91db711 NS |
6276 | argvec = tsubst_template_args (DECL_TI_ARGS |
6277 | (DECL_TEMPLATE_RESULT (gen_tmpl)), | |
6278 | args, complain, in_decl); | |
36a117a5 MM |
6279 | |
6280 | /* Check to see if we already have this specialization. */ | |
c7222c02 MM |
6281 | spec = retrieve_specialization (gen_tmpl, argvec, |
6282 | /*class_specializations_p=*/false); | |
7ddedda4 | 6283 | |
36a117a5 | 6284 | if (spec) |
ae58fa02 MM |
6285 | { |
6286 | r = spec; | |
6287 | break; | |
6288 | } | |
d8c4447d | 6289 | |
f9a7ae04 MM |
6290 | /* We can see more levels of arguments than parameters if |
6291 | there was a specialization of a member template, like | |
6292 | this: | |
6293 | ||
6294 | template <class T> struct S { template <class U> void f(); } | |
6295 | template <> template <class U> void S<int>::f(U); | |
6296 | ||
dc957d14 | 6297 | Here, we'll be substituting into the specialization, |
f9a7ae04 MM |
6298 | because that's where we can find the code we actually |
6299 | want to generate, but we'll have enough arguments for | |
6300 | the most general template. | |
6301 | ||
6302 | We also deal with the peculiar case: | |
d8c4447d MM |
6303 | |
6304 | template <class T> struct S { | |
6305 | template <class U> friend void f(); | |
6306 | }; | |
74b846e0 | 6307 | template <class U> void f() {} |
d8c4447d MM |
6308 | template S<int>; |
6309 | template void f<double>(); | |
6310 | ||
6311 | Here, the ARGS for the instantiation of will be {int, | |
6312 | double}. But, we only need as many ARGS as there are | |
6313 | levels of template parameters in CODE_PATTERN. We are | |
6314 | careful not to get fooled into reducing the ARGS in | |
6315 | situations like: | |
6316 | ||
6317 | template <class T> struct S { template <class U> void f(U); } | |
6318 | template <class T> template <> void S<T>::f(int) {} | |
6319 | ||
6320 | which we can spot because the pattern will be a | |
6321 | specialization in this case. */ | |
6322 | args_depth = TMPL_ARGS_DEPTH (args); | |
6323 | parms_depth = | |
6324 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t))); | |
6325 | if (args_depth > parms_depth | |
6326 | && !DECL_TEMPLATE_SPECIALIZATION (t)) | |
f9a7ae04 | 6327 | args = get_innermost_template_args (args, parms_depth); |
36a117a5 MM |
6328 | } |
6329 | else | |
6330 | { | |
6331 | /* This special case arises when we have something like this: | |
6332 | ||
6333 | template <class T> struct S { | |
6334 | friend void f<int>(int, double); | |
6335 | }; | |
6336 | ||
6337 | Here, the DECL_TI_TEMPLATE for the friend declaration | |
10b1d5e7 MM |
6338 | will be an IDENTIFIER_NODE. We are being called from |
6339 | tsubst_friend_function, and we want only to create a | |
6340 | new decl (R) with appropriate types so that we can call | |
6341 | determine_specialization. */ | |
36a117a5 MM |
6342 | gen_tmpl = NULL_TREE; |
6343 | } | |
6344 | ||
6eb3bb27 | 6345 | if (DECL_CLASS_SCOPE_P (t)) |
8d08fdba | 6346 | { |
5566b478 MS |
6347 | if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t))) |
6348 | member = 2; | |
6349 | else | |
6350 | member = 1; | |
4f1c5b7d | 6351 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
8c6ab2db | 6352 | complain, t, /*entering_scope=*/1); |
5566b478 MS |
6353 | } |
6354 | else | |
6355 | { | |
6356 | member = 0; | |
4f1c5b7d | 6357 | ctx = DECL_CONTEXT (t); |
5566b478 | 6358 | } |
fc6a28d7 | 6359 | type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
b3da7bb1 MM |
6360 | if (type == error_mark_node) |
6361 | return error_mark_node; | |
8d08fdba | 6362 | |
5566b478 MS |
6363 | /* We do NOT check for matching decls pushed separately at this |
6364 | point, as they may not represent instantiations of this | |
6365 | template, and in any case are considered separate under the | |
0a7394bc | 6366 | discrete model. */ |
0acf7199 | 6367 | r = copy_decl (t); |
e1467ff2 | 6368 | DECL_USE_TEMPLATE (r) = 0; |
5566b478 | 6369 | TREE_TYPE (r) = type; |
92643fea MM |
6370 | /* Clear out the mangled name and RTL for the instantiation. */ |
6371 | SET_DECL_ASSEMBLER_NAME (r, NULL_TREE); | |
6372 | SET_DECL_RTL (r, NULL_RTX); | |
5bd61841 | 6373 | DECL_INITIAL (r) = NULL_TREE; |
4f1c5b7d | 6374 | DECL_CONTEXT (r) = ctx; |
5566b478 | 6375 | |
1f6e1acc | 6376 | if (member && DECL_CONV_FN_P (r)) |
1f84ec23 MM |
6377 | /* Type-conversion operator. Reconstruct the name, in |
6378 | case it's the name of one of the template's parameters. */ | |
6379 | DECL_NAME (r) = mangle_conv_op_name_for_type (TREE_TYPE (type)); | |
5566b478 | 6380 | |
4393e105 | 6381 | DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args, |
c2ea3a40 | 6382 | complain, t); |
477f6664 | 6383 | DECL_RESULT (r) = NULL_TREE; |
711734a9 JM |
6384 | |
6385 | TREE_STATIC (r) = 0; | |
6386 | TREE_PUBLIC (r) = TREE_PUBLIC (t); | |
6387 | DECL_EXTERNAL (r) = 1; | |
4684cd27 MM |
6388 | /* If this is an instantiation of a function with internal |
6389 | linkage, we already know what object file linkage will be | |
6390 | assigned to the instantiation. */ | |
6391 | DECL_INTERFACE_KNOWN (r) = !TREE_PUBLIC (r); | |
711734a9 JM |
6392 | DECL_DEFER_OUTPUT (r) = 0; |
6393 | TREE_CHAIN (r) = NULL_TREE; | |
6394 | DECL_PENDING_INLINE_INFO (r) = 0; | |
59026e79 | 6395 | DECL_PENDING_INLINE_P (r) = 0; |
655dc6ee | 6396 | DECL_SAVED_TREE (r) = NULL_TREE; |
711734a9 | 6397 | TREE_USED (r) = 0; |
db9b2174 MM |
6398 | if (DECL_CLONED_FUNCTION (r)) |
6399 | { | |
6400 | DECL_CLONED_FUNCTION (r) = tsubst (DECL_CLONED_FUNCTION (t), | |
c2ea3a40 | 6401 | args, complain, t); |
db9b2174 MM |
6402 | TREE_CHAIN (r) = TREE_CHAIN (DECL_CLONED_FUNCTION (r)); |
6403 | TREE_CHAIN (DECL_CLONED_FUNCTION (r)) = r; | |
6404 | } | |
711734a9 | 6405 | |
92643fea MM |
6406 | /* Set up the DECL_TEMPLATE_INFO for R. There's no need to do |
6407 | this in the special friend case mentioned above where | |
6408 | GEN_TMPL is NULL. */ | |
36a117a5 | 6409 | if (gen_tmpl) |
386b8a85 | 6410 | { |
36a117a5 | 6411 | DECL_TEMPLATE_INFO (r) |
e1b3e07d | 6412 | = tree_cons (gen_tmpl, argvec, NULL_TREE); |
36a117a5 MM |
6413 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
6414 | register_specialization (r, gen_tmpl, argvec); | |
6415 | ||
9188c363 MM |
6416 | /* We're not supposed to instantiate default arguments |
6417 | until they are called, for a template. But, for a | |
6418 | declaration like: | |
6419 | ||
6420 | template <class T> void f () | |
6421 | { extern void g(int i = T()); } | |
6422 | ||
6423 | we should do the substitution when the template is | |
6424 | instantiated. We handle the member function case in | |
6425 | instantiate_class_template since the default arguments | |
6426 | might refer to other members of the class. */ | |
6427 | if (!member | |
6428 | && !PRIMARY_TEMPLATE_P (gen_tmpl) | |
6429 | && !uses_template_parms (argvec)) | |
6430 | tsubst_default_arguments (r); | |
386b8a85 | 6431 | } |
f181d4ae | 6432 | |
cf38f48a MM |
6433 | /* Copy the list of befriending classes. */ |
6434 | for (friends = &DECL_BEFRIENDING_CLASSES (r); | |
6435 | *friends; | |
6436 | friends = &TREE_CHAIN (*friends)) | |
6437 | { | |
6438 | *friends = copy_node (*friends); | |
6439 | TREE_VALUE (*friends) = tsubst (TREE_VALUE (*friends), | |
c2ea3a40 | 6440 | args, complain, |
cf38f48a MM |
6441 | in_decl); |
6442 | } | |
6443 | ||
212e7048 | 6444 | if (DECL_CONSTRUCTOR_P (r) || DECL_DESTRUCTOR_P (r)) |
f181d4ae MM |
6445 | { |
6446 | maybe_retrofit_in_chrg (r); | |
212e7048 MM |
6447 | if (DECL_CONSTRUCTOR_P (r)) |
6448 | grok_ctor_properties (ctx, r); | |
2be678ff JM |
6449 | /* If this is an instantiation of a member template, clone it. |
6450 | If it isn't, that'll be handled by | |
6451 | clone_constructors_and_destructors. */ | |
5e818b93 | 6452 | if (PRIMARY_TEMPLATE_P (gen_tmpl)) |
271e6f02 | 6453 | clone_function_decl (r, /*update_method_vec_p=*/0); |
f181d4ae | 6454 | } |
596ea4e5 | 6455 | else if (IDENTIFIER_OPNAME_P (DECL_NAME (r))) |
4b0d3cbe MM |
6456 | grok_op_properties (r, DECL_FRIEND_P (r), |
6457 | (complain & tf_error) != 0); | |
c8b2e872 MM |
6458 | |
6459 | if (DECL_FRIEND_P (t) && DECL_FRIEND_CONTEXT (t)) | |
6460 | SET_DECL_FRIEND_CONTEXT (r, | |
6461 | tsubst (DECL_FRIEND_CONTEXT (t), | |
6462 | args, complain, in_decl)); | |
8d08fdba | 6463 | } |
ae58fa02 | 6464 | break; |
8d08fdba MS |
6465 | |
6466 | case PARM_DECL: | |
6467 | { | |
fc6a28d7 MM |
6468 | tree type; |
6469 | ||
ae58fa02 | 6470 | r = copy_node (t); |
833aa4c4 NS |
6471 | if (DECL_TEMPLATE_PARM_P (t)) |
6472 | SET_DECL_TEMPLATE_PARM_P (r); | |
8e51619a | 6473 | |
fc6a28d7 | 6474 | type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
5566b478 | 6475 | TREE_TYPE (r) = type; |
89d684bb | 6476 | c_apply_type_quals_to_decl (cp_type_quals (type), r); |
1b8899d1 | 6477 | |
560ad596 MM |
6478 | if (DECL_INITIAL (r)) |
6479 | { | |
6480 | if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX) | |
6481 | DECL_INITIAL (r) = TREE_TYPE (r); | |
6482 | else | |
6483 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args, | |
6484 | complain, in_decl); | |
6485 | } | |
db2767b6 | 6486 | |
5566b478 | 6487 | DECL_CONTEXT (r) = NULL_TREE; |
8e51619a JM |
6488 | |
6489 | if (!DECL_TEMPLATE_PARM_P (r)) | |
6490 | DECL_ARG_TYPE (r) = type_passed_as (type); | |
8d08fdba | 6491 | if (TREE_CHAIN (t)) |
4393e105 | 6492 | TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args, |
c2ea3a40 | 6493 | complain, TREE_CHAIN (t)); |
8d08fdba | 6494 | } |
ae58fa02 | 6495 | break; |
8d08fdba | 6496 | |
5566b478 MS |
6497 | case FIELD_DECL: |
6498 | { | |
fc6a28d7 MM |
6499 | tree type; |
6500 | ||
0acf7199 | 6501 | r = copy_decl (t); |
fc6a28d7 MM |
6502 | type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
6503 | if (type == error_mark_node) | |
6504 | return error_mark_node; | |
1b8899d1 | 6505 | TREE_TYPE (r) = type; |
89d684bb | 6506 | c_apply_type_quals_to_decl (cp_type_quals (type), r); |
1b8899d1 MM |
6507 | |
6508 | /* We don't have to set DECL_CONTEXT here; it is set by | |
6509 | finish_member_declaration. */ | |
4393e105 | 6510 | DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args, |
c2ea3a40 | 6511 | complain, in_decl); |
5566b478 | 6512 | TREE_CHAIN (r) = NULL_TREE; |
dfbb4f34 | 6513 | if (VOID_TYPE_P (type)) |
0f51ccfc | 6514 | cp_error_at ("instantiation of %qD as type %qT", r, type); |
5566b478 | 6515 | } |
ae58fa02 | 6516 | break; |
5566b478 MS |
6517 | |
6518 | case USING_DECL: | |
6519 | { | |
ae58fa02 | 6520 | r = copy_node (t); |
fd9aef9d NS |
6521 | /* It is not a dependent using decl any more. */ |
6522 | TREE_TYPE (r) = void_type_node; | |
5566b478 | 6523 | DECL_INITIAL (r) |
c2ea3a40 | 6524 | = tsubst_copy (DECL_INITIAL (t), args, complain, in_decl); |
53400b9e GB |
6525 | DECL_NAME (r) |
6526 | = tsubst_copy (DECL_NAME (t), args, complain, in_decl); | |
5566b478 | 6527 | TREE_CHAIN (r) = NULL_TREE; |
5566b478 | 6528 | } |
ae58fa02 | 6529 | break; |
5566b478 | 6530 | |
9188c363 | 6531 | case TYPE_DECL: |
5566b478 MS |
6532 | case VAR_DECL: |
6533 | { | |
1cea0434 KG |
6534 | tree argvec = NULL_TREE; |
6535 | tree gen_tmpl = NULL_TREE; | |
36a117a5 | 6536 | tree spec; |
1cea0434 | 6537 | tree tmpl = NULL_TREE; |
9188c363 | 6538 | tree ctx; |
fc6a28d7 | 6539 | tree type = NULL_TREE; |
6dfbb909 | 6540 | int local_p; |
9188c363 | 6541 | |
fc6a28d7 MM |
6542 | if (TREE_CODE (t) == TYPE_DECL) |
6543 | { | |
6544 | type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
6545 | if (TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM | |
6546 | || t == TYPE_MAIN_DECL (TREE_TYPE (t))) | |
6547 | { | |
6548 | /* If this is the canonical decl, we don't have to | |
6549 | mess with instantiations, and often we can't (for | |
6550 | typename, template type parms and such). Note that | |
6551 | TYPE_NAME is not correct for the above test if | |
6552 | we've copied the type for a typedef. */ | |
6553 | r = TYPE_NAME (type); | |
6554 | break; | |
6555 | } | |
6556 | } | |
6557 | ||
6dfbb909 MM |
6558 | /* Assume this is a non-local variable. */ |
6559 | local_p = 0; | |
5566b478 | 6560 | |
de96bf57 | 6561 | if (TYPE_P (CP_DECL_CONTEXT (t))) |
9188c363 | 6562 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
c2ea3a40 | 6563 | complain, |
9188c363 | 6564 | in_decl, /*entering_scope=*/1); |
2ba9c47e MM |
6565 | else if (DECL_NAMESPACE_SCOPE_P (t)) |
6566 | ctx = DECL_CONTEXT (t); | |
9188c363 | 6567 | else |
6dfbb909 MM |
6568 | { |
6569 | /* Subsequent calls to pushdecl will fill this in. */ | |
6570 | ctx = NULL_TREE; | |
2ba9c47e | 6571 | local_p = 1; |
6dfbb909 | 6572 | } |
9188c363 | 6573 | |
36a117a5 | 6574 | /* Check to see if we already have this specialization. */ |
6dfbb909 MM |
6575 | if (!local_p) |
6576 | { | |
6577 | tmpl = DECL_TI_TEMPLATE (t); | |
6578 | gen_tmpl = most_general_template (tmpl); | |
c2ea3a40 | 6579 | argvec = tsubst (DECL_TI_ARGS (t), args, complain, in_decl); |
c7222c02 MM |
6580 | spec = retrieve_specialization (gen_tmpl, argvec, |
6581 | /*class_specializations_p=*/false); | |
6dfbb909 | 6582 | } |
9188c363 | 6583 | else |
6dfbb909 | 6584 | spec = retrieve_local_specialization (t); |
9188c363 | 6585 | |
36a117a5 | 6586 | if (spec) |
ae58fa02 MM |
6587 | { |
6588 | r = spec; | |
6589 | break; | |
6590 | } | |
5566b478 | 6591 | |
0acf7199 | 6592 | r = copy_decl (t); |
edebf865 | 6593 | if (TREE_CODE (r) == VAR_DECL) |
39703eb9 | 6594 | { |
fc6a28d7 MM |
6595 | type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
6596 | if (type == error_mark_node) | |
6597 | return error_mark_node; | |
39703eb9 MM |
6598 | type = complete_type (type); |
6599 | DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r) | |
6600 | = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (t); | |
62e19030 | 6601 | type = check_var_type (DECL_NAME (r), type); |
39703eb9 | 6602 | } |
a3d87771 MM |
6603 | else if (DECL_SELF_REFERENCE_P (t)) |
6604 | SET_DECL_SELF_REFERENCE_P (r); | |
01f4137f | 6605 | TREE_TYPE (r) = type; |
89d684bb | 6606 | c_apply_type_quals_to_decl (cp_type_quals (type), r); |
5566b478 | 6607 | DECL_CONTEXT (r) = ctx; |
92643fea MM |
6608 | /* Clear out the mangled name and RTL for the instantiation. */ |
6609 | SET_DECL_ASSEMBLER_NAME (r, NULL_TREE); | |
6610 | SET_DECL_RTL (r, NULL_RTX); | |
d11ad92e MS |
6611 | |
6612 | /* Don't try to expand the initializer until someone tries to use | |
6613 | this variable; otherwise we run into circular dependencies. */ | |
6614 | DECL_INITIAL (r) = NULL_TREE; | |
19e7881c | 6615 | SET_DECL_RTL (r, NULL_RTX); |
06ceef4e | 6616 | DECL_SIZE (r) = DECL_SIZE_UNIT (r) = 0; |
5566b478 | 6617 | |
e0942dcd MM |
6618 | /* Even if the original location is out of scope, the newly |
6619 | substituted one is not. */ | |
6620 | if (TREE_CODE (r) == VAR_DECL) | |
17bbb839 MM |
6621 | { |
6622 | DECL_DEAD_FOR_LOCAL (r) = 0; | |
6623 | DECL_INITIALIZED_P (r) = 0; | |
6624 | } | |
e0942dcd | 6625 | |
6dfbb909 MM |
6626 | if (!local_p) |
6627 | { | |
6628 | /* A static data member declaration is always marked | |
6629 | external when it is declared in-class, even if an | |
6630 | initializer is present. We mimic the non-template | |
6631 | processing here. */ | |
6632 | DECL_EXTERNAL (r) = 1; | |
fa8d6e85 | 6633 | |
6dfbb909 MM |
6634 | register_specialization (r, gen_tmpl, argvec); |
6635 | DECL_TEMPLATE_INFO (r) = tree_cons (tmpl, argvec, NULL_TREE); | |
6636 | SET_DECL_IMPLICIT_INSTANTIATION (r); | |
6637 | } | |
9188c363 | 6638 | else |
6dfbb909 | 6639 | register_local_specialization (r, t); |
5566b478 | 6640 | |
5566b478 | 6641 | TREE_CHAIN (r) = NULL_TREE; |
edebf865 | 6642 | layout_decl (r, 0); |
5566b478 | 6643 | } |
ae58fa02 | 6644 | break; |
5566b478 | 6645 | |
ae58fa02 | 6646 | default: |
315fb5db | 6647 | gcc_unreachable (); |
ae58fa02 MM |
6648 | } |
6649 | ||
6650 | /* Restore the file and line information. */ | |
82a98427 | 6651 | input_location = saved_loc; |
ae58fa02 MM |
6652 | |
6653 | return r; | |
6654 | } | |
6655 | ||
34cd5ae7 | 6656 | /* Substitute into the ARG_TYPES of a function type. */ |
cabc336a | 6657 | |
e9659ab0 | 6658 | static tree |
3a978d72 NN |
6659 | tsubst_arg_types (tree arg_types, |
6660 | tree args, | |
6661 | tsubst_flags_t complain, | |
6662 | tree in_decl) | |
cabc336a MM |
6663 | { |
6664 | tree remaining_arg_types; | |
cabc336a MM |
6665 | tree type; |
6666 | ||
6667 | if (!arg_types || arg_types == void_list_node) | |
6668 | return arg_types; | |
6669 | ||
6670 | remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types), | |
4393e105 MM |
6671 | args, complain, in_decl); |
6672 | if (remaining_arg_types == error_mark_node) | |
6673 | return error_mark_node; | |
6674 | ||
6675 | type = tsubst (TREE_VALUE (arg_types), args, complain, in_decl); | |
6676 | if (type == error_mark_node) | |
6677 | return error_mark_node; | |
4b2811e9 NS |
6678 | if (VOID_TYPE_P (type)) |
6679 | { | |
c2ea3a40 | 6680 | if (complain & tf_error) |
4b2811e9 | 6681 | { |
0f51ccfc | 6682 | error ("invalid parameter type %qT", type); |
4b2811e9 | 6683 | if (in_decl) |
0f51ccfc | 6684 | cp_error_at ("in declaration %qD", in_decl); |
4b2811e9 NS |
6685 | } |
6686 | return error_mark_node; | |
6687 | } | |
cabc336a | 6688 | |
4393e105 MM |
6689 | /* Do array-to-pointer, function-to-pointer conversion, and ignore |
6690 | top-level qualifiers as required. */ | |
6691 | type = TYPE_MAIN_VARIANT (type_decays_to (type)); | |
cabc336a MM |
6692 | |
6693 | /* Note that we do not substitute into default arguments here. The | |
6694 | standard mandates that they be instantiated only when needed, | |
6695 | which is done in build_over_call. */ | |
51632249 JM |
6696 | return hash_tree_cons (TREE_PURPOSE (arg_types), type, |
6697 | remaining_arg_types); | |
cabc336a MM |
6698 | |
6699 | } | |
6700 | ||
4393e105 MM |
6701 | /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does |
6702 | *not* handle the exception-specification for FNTYPE, because the | |
6703 | initial substitution of explicitly provided template parameters | |
6704 | during argument deduction forbids substitution into the | |
6705 | exception-specification: | |
6706 | ||
6707 | [temp.deduct] | |
6708 | ||
6709 | All references in the function type of the function template to the | |
6710 | corresponding template parameters are replaced by the specified tem- | |
6711 | plate argument values. If a substitution in a template parameter or | |
6712 | in the function type of the function template results in an invalid | |
6713 | type, type deduction fails. [Note: The equivalent substitution in | |
6714 | exception specifications is done only when the function is instanti- | |
6715 | ated, at which point a program is ill-formed if the substitution | |
6716 | results in an invalid type.] */ | |
6717 | ||
6718 | static tree | |
3a978d72 NN |
6719 | tsubst_function_type (tree t, |
6720 | tree args, | |
6721 | tsubst_flags_t complain, | |
6722 | tree in_decl) | |
4393e105 MM |
6723 | { |
6724 | tree return_type; | |
6725 | tree arg_types; | |
6726 | tree fntype; | |
6727 | ||
8dd3f57a | 6728 | /* The TYPE_CONTEXT is not used for function/method types. */ |
50bc768d | 6729 | gcc_assert (TYPE_CONTEXT (t) == NULL_TREE); |
4393e105 | 6730 | |
46c895ac | 6731 | /* Substitute the return type. */ |
4393e105 MM |
6732 | return_type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
6733 | if (return_type == error_mark_node) | |
6734 | return error_mark_node; | |
6e2993bf MM |
6735 | /* The standard does not presently indicate that creation of a |
6736 | function type with an invalid return type is a deduction failure. | |
270af55d | 6737 | However, that is clearly analogous to creating an array of "void" |
6e2993bf MM |
6738 | or a reference to a reference. This is core issue #486. */ |
6739 | if (TREE_CODE (return_type) == ARRAY_TYPE | |
6740 | || TREE_CODE (return_type) == FUNCTION_TYPE) | |
6741 | { | |
6742 | if (complain & tf_error) | |
6743 | { | |
6744 | if (TREE_CODE (return_type) == ARRAY_TYPE) | |
6745 | error ("function returning an array"); | |
6746 | else | |
6747 | error ("function returning a function"); | |
6748 | } | |
6749 | return error_mark_node; | |
6750 | } | |
4393e105 | 6751 | |
34cd5ae7 | 6752 | /* Substitute the argument types. */ |
4393e105 MM |
6753 | arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args, |
6754 | complain, in_decl); | |
6755 | if (arg_types == error_mark_node) | |
6756 | return error_mark_node; | |
6757 | ||
6758 | /* Construct a new type node and return it. */ | |
6759 | if (TREE_CODE (t) == FUNCTION_TYPE) | |
6760 | fntype = build_function_type (return_type, arg_types); | |
6761 | else | |
6762 | { | |
6763 | tree r = TREE_TYPE (TREE_VALUE (arg_types)); | |
6764 | if (! IS_AGGR_TYPE (r)) | |
6765 | { | |
6766 | /* [temp.deduct] | |
6767 | ||
6768 | Type deduction may fail for any of the following | |
6769 | reasons: | |
6770 | ||
6771 | -- Attempting to create "pointer to member of T" when T | |
6772 | is not a class type. */ | |
c2ea3a40 | 6773 | if (complain & tf_error) |
0f51ccfc | 6774 | error ("creating pointer to member function of non-class type %qT", |
4393e105 MM |
6775 | r); |
6776 | return error_mark_node; | |
6777 | } | |
6778 | ||
43dc123f MM |
6779 | fntype = build_method_type_directly (r, return_type, |
6780 | TREE_CHAIN (arg_types)); | |
4393e105 | 6781 | } |
c2ea3a40 | 6782 | fntype = cp_build_qualified_type_real (fntype, TYPE_QUALS (t), complain); |
e9525111 | 6783 | fntype = cp_build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (t)); |
4393e105 MM |
6784 | |
6785 | return fntype; | |
6786 | } | |
6787 | ||
c7222c02 MM |
6788 | /* FNTYPE is a FUNCTION_TYPE or METHOD_TYPE. Substitute the template |
6789 | ARGS into that specification, and return the substituted | |
6790 | specification. If there is no specification, return NULL_TREE. */ | |
6791 | ||
6792 | static tree | |
6793 | tsubst_exception_specification (tree fntype, | |
6794 | tree args, | |
6795 | tsubst_flags_t complain, | |
6796 | tree in_decl) | |
6797 | { | |
6798 | tree specs; | |
6799 | tree new_specs; | |
6800 | ||
6801 | specs = TYPE_RAISES_EXCEPTIONS (fntype); | |
6802 | new_specs = NULL_TREE; | |
6803 | if (specs) | |
6804 | { | |
6805 | if (! TREE_VALUE (specs)) | |
6806 | new_specs = specs; | |
6807 | else | |
6808 | while (specs) | |
6809 | { | |
6810 | tree spec; | |
6811 | spec = tsubst (TREE_VALUE (specs), args, complain, in_decl); | |
6812 | if (spec == error_mark_node) | |
6813 | return spec; | |
6814 | new_specs = add_exception_specifier (new_specs, spec, complain); | |
6815 | specs = TREE_CHAIN (specs); | |
6816 | } | |
6817 | } | |
6818 | return new_specs; | |
6819 | } | |
6820 | ||
297e73d8 MM |
6821 | /* Substitute into the PARMS of a call-declarator. */ |
6822 | ||
e9659ab0 | 6823 | static tree |
3a978d72 NN |
6824 | tsubst_call_declarator_parms (tree parms, |
6825 | tree args, | |
6826 | tsubst_flags_t complain, | |
6827 | tree in_decl) | |
297e73d8 MM |
6828 | { |
6829 | tree new_parms; | |
6830 | tree type; | |
6831 | tree defarg; | |
6832 | ||
6833 | if (!parms || parms == void_list_node) | |
6834 | return parms; | |
6835 | ||
6836 | new_parms = tsubst_call_declarator_parms (TREE_CHAIN (parms), | |
4393e105 | 6837 | args, complain, in_decl); |
297e73d8 MM |
6838 | |
6839 | /* Figure out the type of this parameter. */ | |
4393e105 | 6840 | type = tsubst (TREE_VALUE (parms), args, complain, in_decl); |
297e73d8 MM |
6841 | |
6842 | /* Figure out the default argument as well. Note that we use | |
4393e105 MM |
6843 | tsubst_expr since the default argument is really an expression. */ |
6844 | defarg = tsubst_expr (TREE_PURPOSE (parms), args, complain, in_decl); | |
297e73d8 MM |
6845 | |
6846 | /* Chain this parameter on to the front of those we have already | |
6847 | processed. We don't use hash_tree_cons because that function | |
6848 | doesn't check TREE_PARMLIST. */ | |
6849 | new_parms = tree_cons (defarg, type, new_parms); | |
6850 | ||
297e73d8 MM |
6851 | return new_parms; |
6852 | } | |
6853 | ||
4393e105 MM |
6854 | /* Take the tree structure T and replace template parameters used |
6855 | therein with the argument vector ARGS. IN_DECL is an associated | |
6856 | decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE. | |
c2ea3a40 NS |
6857 | Issue error and warning messages under control of COMPLAIN. Note |
6858 | that we must be relatively non-tolerant of extensions here, in | |
6859 | order to preserve conformance; if we allow substitutions that | |
6860 | should not be allowed, we may allow argument deductions that should | |
6861 | not succeed, and therefore report ambiguous overload situations | |
6862 | where there are none. In theory, we could allow the substitution, | |
6863 | but indicate that it should have failed, and allow our caller to | |
6864 | make sure that the right thing happens, but we don't try to do this | |
6865 | yet. | |
4393e105 MM |
6866 | |
6867 | This function is used for dealing with types, decls and the like; | |
6868 | for expressions, use tsubst_expr or tsubst_copy. */ | |
ae58fa02 | 6869 | |
14d22dd6 | 6870 | static tree |
3a978d72 | 6871 | tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl) |
ae58fa02 | 6872 | { |
0ecfe0b4 | 6873 | tree type, r; |
ae58fa02 MM |
6874 | |
6875 | if (t == NULL_TREE || t == error_mark_node | |
6876 | || t == integer_type_node | |
6877 | || t == void_type_node | |
6878 | || t == char_type_node | |
539599c1 | 6879 | || t == unknown_type_node |
ae58fa02 MM |
6880 | || TREE_CODE (t) == NAMESPACE_DECL) |
6881 | return t; | |
6882 | ||
fc6a28d7 MM |
6883 | if (DECL_P (t)) |
6884 | return tsubst_decl (t, args, complain); | |
6885 | ||
ae58fa02 MM |
6886 | if (TREE_CODE (t) == IDENTIFIER_NODE) |
6887 | type = IDENTIFIER_TYPE_VALUE (t); | |
6888 | else | |
6889 | type = TREE_TYPE (t); | |
399dedb9 | 6890 | |
50bc768d | 6891 | gcc_assert (type != unknown_type_node); |
ae58fa02 | 6892 | |
fc6a28d7 | 6893 | if (type |
ae58fa02 | 6894 | && TREE_CODE (t) != TYPENAME_TYPE |
4393e105 MM |
6895 | && TREE_CODE (t) != IDENTIFIER_NODE |
6896 | && TREE_CODE (t) != FUNCTION_TYPE | |
6897 | && TREE_CODE (t) != METHOD_TYPE) | |
6898 | type = tsubst (type, args, complain, in_decl); | |
6899 | if (type == error_mark_node) | |
6900 | return error_mark_node; | |
ae58fa02 | 6901 | |
ae58fa02 MM |
6902 | switch (TREE_CODE (t)) |
6903 | { | |
6904 | case RECORD_TYPE: | |
6905 | case UNION_TYPE: | |
6906 | case ENUMERAL_TYPE: | |
4393e105 MM |
6907 | return tsubst_aggr_type (t, args, complain, in_decl, |
6908 | /*entering_scope=*/0); | |
ae58fa02 MM |
6909 | |
6910 | case ERROR_MARK: | |
6911 | case IDENTIFIER_NODE: | |
ae58fa02 MM |
6912 | case VOID_TYPE: |
6913 | case REAL_TYPE: | |
6914 | case COMPLEX_TYPE: | |
c00996a3 | 6915 | case VECTOR_TYPE: |
ae58fa02 MM |
6916 | case BOOLEAN_TYPE: |
6917 | case INTEGER_CST: | |
6918 | case REAL_CST: | |
6919 | case STRING_CST: | |
6920 | return t; | |
6921 | ||
6922 | case INTEGER_TYPE: | |
6923 | if (t == integer_type_node) | |
6924 | return t; | |
6925 | ||
6926 | if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST | |
6927 | && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST) | |
6928 | return t; | |
d2e5ee5c | 6929 | |
5566b478 | 6930 | { |
ddce3528 | 6931 | tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0); |
7ddedda4 | 6932 | |
a91db711 NS |
6933 | /* The array dimension behaves like a non-type template arg, |
6934 | in that we want to fold it as much as possible. */ | |
6935 | max = tsubst_template_arg (omax, args, complain, in_decl); | |
4ef69b83 | 6936 | max = fold_decl_constant_value (max); |
8dd3f57a | 6937 | |
ddce3528 JM |
6938 | if (integer_zerop (omax)) |
6939 | { | |
6940 | /* Still allow an explicit array of size zero. */ | |
6941 | if (pedantic) | |
6942 | pedwarn ("creating array with size zero"); | |
6943 | } | |
07c88314 MM |
6944 | else if (integer_zerop (max) |
6945 | || (TREE_CODE (max) == INTEGER_CST | |
6946 | && INT_CST_LT (max, integer_zero_node))) | |
0ecfe0b4 | 6947 | { |
4393e105 MM |
6948 | /* [temp.deduct] |
6949 | ||
6950 | Type deduction may fail for any of the following | |
6951 | reasons: | |
6952 | ||
bf8f3f93 MM |
6953 | Attempting to create an array with a size that is |
6954 | zero or negative. */ | |
c2ea3a40 | 6955 | if (complain & tf_error) |
0f51ccfc | 6956 | error ("creating array with size zero (%qE)", max); |
4393e105 MM |
6957 | |
6958 | return error_mark_node; | |
0ecfe0b4 JM |
6959 | } |
6960 | ||
c95cd22e | 6961 | return compute_array_index_type (NULL_TREE, max); |
ae58fa02 MM |
6962 | } |
6963 | ||
6964 | case TEMPLATE_TYPE_PARM: | |
6965 | case TEMPLATE_TEMPLATE_PARM: | |
a1281f45 | 6966 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
ae58fa02 MM |
6967 | case TEMPLATE_PARM_INDEX: |
6968 | { | |
6969 | int idx; | |
6970 | int level; | |
6971 | int levels; | |
315fb5db | 6972 | tree arg = NULL_TREE; |
0ecfe0b4 JM |
6973 | |
6974 | r = NULL_TREE; | |
ae58fa02 | 6975 | |
315fb5db | 6976 | gcc_assert (TREE_VEC_LENGTH (args) > 0); |
ae58fa02 | 6977 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM |
a1281f45 KL |
6978 | || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM |
6979 | || TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
ae58fa02 MM |
6980 | { |
6981 | idx = TEMPLATE_TYPE_IDX (t); | |
6982 | level = TEMPLATE_TYPE_LEVEL (t); | |
6983 | } | |
6984 | else | |
6985 | { | |
6986 | idx = TEMPLATE_PARM_IDX (t); | |
6987 | level = TEMPLATE_PARM_LEVEL (t); | |
6988 | } | |
6989 | ||
315fb5db NS |
6990 | levels = TMPL_ARGS_DEPTH (args); |
6991 | if (level <= levels) | |
6992 | arg = TMPL_ARG (args, level, idx); | |
ae58fa02 | 6993 | |
315fb5db NS |
6994 | if (arg == error_mark_node) |
6995 | return error_mark_node; | |
6996 | else if (arg != NULL_TREE) | |
6997 | { | |
6998 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM) | |
ae58fa02 | 6999 | { |
315fb5db NS |
7000 | gcc_assert (TYPE_P (arg)); |
7001 | return cp_build_qualified_type_real | |
7002 | (arg, cp_type_quals (arg) | cp_type_quals (t), | |
7003 | complain | tf_ignore_bad_quals); | |
7004 | } | |
7005 | else if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
7006 | { | |
7007 | /* We are processing a type constructed from a | |
7008 | template template parameter. */ | |
7009 | tree argvec = tsubst (TYPE_TI_ARGS (t), | |
7010 | args, complain, in_decl); | |
7011 | if (argvec == error_mark_node) | |
7012 | return error_mark_node; | |
4393e105 | 7013 | |
315fb5db NS |
7014 | /* We can get a TEMPLATE_TEMPLATE_PARM here when we |
7015 | are resolving nested-types in the signature of a | |
7016 | member function templates. Otherwise ARG is a | |
7017 | TEMPLATE_DECL and is the real template to be | |
7018 | instantiated. */ | |
7019 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
7020 | arg = TYPE_NAME (arg); | |
7021 | ||
7022 | r = lookup_template_class (arg, | |
7023 | argvec, in_decl, | |
7024 | DECL_CONTEXT (arg), | |
7025 | /*entering_scope=*/0, | |
7026 | complain); | |
7027 | return cp_build_qualified_type_real | |
7028 | (r, TYPE_QUALS (t), complain); | |
ae58fa02 | 7029 | } |
315fb5db NS |
7030 | else |
7031 | /* TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX. */ | |
7032 | return arg; | |
ae58fa02 MM |
7033 | } |
7034 | ||
7035 | if (level == 1) | |
7036 | /* This can happen during the attempted tsubst'ing in | |
7037 | unify. This means that we don't yet have any information | |
7038 | about the template parameter in question. */ | |
7039 | return t; | |
7040 | ||
7041 | /* If we get here, we must have been looking at a parm for a | |
7042 | more deeply nested template. Make a new version of this | |
7043 | template parameter, but with a lower level. */ | |
7044 | switch (TREE_CODE (t)) | |
7045 | { | |
7046 | case TEMPLATE_TYPE_PARM: | |
7047 | case TEMPLATE_TEMPLATE_PARM: | |
a1281f45 | 7048 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
89d684bb | 7049 | if (cp_type_quals (t)) |
ae58fa02 | 7050 | { |
9ccf6541 | 7051 | r = tsubst (TYPE_MAIN_VARIANT (t), args, complain, in_decl); |
4f2b0fb2 NS |
7052 | r = cp_build_qualified_type_real |
7053 | (r, cp_type_quals (t), | |
7054 | complain | (TREE_CODE (t) == TEMPLATE_TYPE_PARM | |
7055 | ? tf_ignore_bad_quals : 0)); | |
9ccf6541 MM |
7056 | } |
7057 | else | |
7058 | { | |
11e74ea6 | 7059 | r = copy_type (t); |
9ccf6541 MM |
7060 | TEMPLATE_TYPE_PARM_INDEX (r) |
7061 | = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t), | |
7062 | r, levels); | |
7063 | TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r); | |
7064 | TYPE_MAIN_VARIANT (r) = r; | |
7065 | TYPE_POINTER_TO (r) = NULL_TREE; | |
7066 | TYPE_REFERENCE_TO (r) = NULL_TREE; | |
7067 | ||
a1281f45 | 7068 | if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) |
9ccf6541 MM |
7069 | { |
7070 | tree argvec = tsubst (TYPE_TI_ARGS (t), args, | |
7071 | complain, in_decl); | |
7072 | if (argvec == error_mark_node) | |
7073 | return error_mark_node; | |
4393e105 | 7074 | |
9ccf6541 MM |
7075 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r) |
7076 | = tree_cons (TYPE_TI_TEMPLATE (t), argvec, NULL_TREE); | |
7077 | } | |
ae58fa02 MM |
7078 | } |
7079 | break; | |
7080 | ||
7081 | case TEMPLATE_PARM_INDEX: | |
7082 | r = reduce_template_parm_level (t, type, levels); | |
7083 | break; | |
7084 | ||
7085 | default: | |
315fb5db | 7086 | gcc_unreachable (); |
ae58fa02 MM |
7087 | } |
7088 | ||
5566b478 | 7089 | return r; |
ae58fa02 | 7090 | } |
5566b478 | 7091 | |
8d08fdba MS |
7092 | case TREE_LIST: |
7093 | { | |
058b15c1 | 7094 | tree purpose, value, chain; |
8d08fdba MS |
7095 | |
7096 | if (t == void_list_node) | |
7097 | return t; | |
7098 | ||
8d08fdba MS |
7099 | purpose = TREE_PURPOSE (t); |
7100 | if (purpose) | |
4393e105 MM |
7101 | { |
7102 | purpose = tsubst (purpose, args, complain, in_decl); | |
7103 | if (purpose == error_mark_node) | |
7104 | return error_mark_node; | |
7105 | } | |
8d08fdba MS |
7106 | value = TREE_VALUE (t); |
7107 | if (value) | |
4393e105 MM |
7108 | { |
7109 | value = tsubst (value, args, complain, in_decl); | |
7110 | if (value == error_mark_node) | |
7111 | return error_mark_node; | |
7112 | } | |
8d08fdba MS |
7113 | chain = TREE_CHAIN (t); |
7114 | if (chain && chain != void_type_node) | |
4393e105 MM |
7115 | { |
7116 | chain = tsubst (chain, args, complain, in_decl); | |
7117 | if (chain == error_mark_node) | |
7118 | return error_mark_node; | |
7119 | } | |
8d08fdba MS |
7120 | if (purpose == TREE_PURPOSE (t) |
7121 | && value == TREE_VALUE (t) | |
7122 | && chain == TREE_CHAIN (t)) | |
7123 | return t; | |
058b15c1 | 7124 | return hash_tree_cons (purpose, value, chain); |
8d08fdba | 7125 | } |
95b4aca6 NS |
7126 | |
7127 | case TREE_BINFO: | |
bd7eccc4 | 7128 | /* We should never be tsubsting a binfo. */ |
315fb5db | 7129 | gcc_unreachable (); |
85b71cf2 | 7130 | |
95b4aca6 NS |
7131 | case TREE_VEC: |
7132 | /* A vector of template arguments. */ | |
50bc768d | 7133 | gcc_assert (!type); |
a91db711 | 7134 | return tsubst_template_args (t, args, complain, in_decl); |
8d08fdba | 7135 | |
8d08fdba MS |
7136 | case POINTER_TYPE: |
7137 | case REFERENCE_TYPE: | |
7138 | { | |
8d08fdba | 7139 | enum tree_code code; |
79a7c7fa | 7140 | |
46c895ac | 7141 | if (type == TREE_TYPE (t) && TREE_CODE (type) != METHOD_TYPE) |
8d08fdba MS |
7142 | return t; |
7143 | ||
7144 | code = TREE_CODE (t); | |
4393e105 MM |
7145 | |
7146 | ||
7147 | /* [temp.deduct] | |
7148 | ||
7149 | Type deduction may fail for any of the following | |
7150 | reasons: | |
7151 | ||
7152 | -- Attempting to create a pointer to reference type. | |
7153 | -- Attempting to create a reference to a reference type or | |
7154 | a reference to void. */ | |
0ecfe0b4 JM |
7155 | if (TREE_CODE (type) == REFERENCE_TYPE |
7156 | || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE)) | |
79a7c7fa | 7157 | { |
82a98427 | 7158 | static location_t last_loc; |
79a7c7fa JM |
7159 | |
7160 | /* We keep track of the last time we issued this error | |
7161 | message to avoid spewing a ton of messages during a | |
7162 | single bad template instantiation. */ | |
c2ea3a40 | 7163 | if (complain & tf_error |
93409b8c | 7164 | #ifdef USE_MAPPED_LOCATION |
9b60dfd7 | 7165 | && last_loc != input_location |
93409b8c | 7166 | #else |
82a98427 | 7167 | && (last_loc.line != input_line |
9b60dfd7 | 7168 | || last_loc.file != input_filename) |
93409b8c | 7169 | #endif |
9b60dfd7 | 7170 | ) |
79a7c7fa | 7171 | { |
0ecfe0b4 | 7172 | if (TREE_CODE (type) == VOID_TYPE) |
33bd39a2 | 7173 | error ("forming reference to void"); |
0ecfe0b4 | 7174 | else |
0f51ccfc GDR |
7175 | error ("forming %s to reference type %qT", |
7176 | (code == POINTER_TYPE) ? "pointer" : "reference", | |
7177 | type); | |
82a98427 | 7178 | last_loc = input_location; |
79a7c7fa JM |
7179 | } |
7180 | ||
4393e105 | 7181 | return error_mark_node; |
79a7c7fa JM |
7182 | } |
7183 | else if (code == POINTER_TYPE) | |
46c895ac NS |
7184 | { |
7185 | r = build_pointer_type (type); | |
7186 | if (TREE_CODE (type) == METHOD_TYPE) | |
7187 | r = build_ptrmemfunc_type (r); | |
7188 | } | |
8d08fdba MS |
7189 | else |
7190 | r = build_reference_type (type); | |
adecb3f4 | 7191 | r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain); |
79a7c7fa | 7192 | |
a5f1c5f8 NS |
7193 | if (r != error_mark_node) |
7194 | /* Will this ever be needed for TYPE_..._TO values? */ | |
7195 | layout_type (r); | |
7196 | ||
8d08fdba MS |
7197 | return r; |
7198 | } | |
a4443a08 | 7199 | case OFFSET_TYPE: |
0ecfe0b4 | 7200 | { |
4393e105 MM |
7201 | r = tsubst (TYPE_OFFSET_BASETYPE (t), args, complain, in_decl); |
7202 | if (r == error_mark_node || !IS_AGGR_TYPE (r)) | |
7203 | { | |
7204 | /* [temp.deduct] | |
7205 | ||
7206 | Type deduction may fail for any of the following | |
7207 | reasons: | |
7208 | ||
7209 | -- Attempting to create "pointer to member of T" when T | |
7210 | is not a class type. */ | |
c2ea3a40 | 7211 | if (complain & tf_error) |
0f51ccfc | 7212 | error ("creating pointer to member of non-class type %qT", r); |
4393e105 MM |
7213 | return error_mark_node; |
7214 | } | |
46c895ac NS |
7215 | if (TREE_CODE (type) == REFERENCE_TYPE) |
7216 | { | |
4f09be91 | 7217 | if (complain & tf_error) |
0f51ccfc | 7218 | error ("creating pointer to member reference type %qT", type); |
46c895ac NS |
7219 | |
7220 | return error_mark_node; | |
7221 | } | |
50bc768d | 7222 | gcc_assert (TREE_CODE (type) != METHOD_TYPE); |
46c895ac | 7223 | if (TREE_CODE (type) == FUNCTION_TYPE) |
a5ac359a MM |
7224 | { |
7225 | /* This is really a method type. The cv qualifiers of the | |
7226 | this pointer should _not_ be determined by the cv | |
7227 | qualifiers of the class type. They should be held | |
7228 | somewhere in the FUNCTION_TYPE, but we don't do that at | |
7229 | the moment. Consider | |
7230 | typedef void (Func) () const; | |
7231 | ||
7232 | template <typename T1> void Foo (Func T1::*); | |
7233 | ||
7234 | */ | |
7235 | tree method_type; | |
7236 | ||
43dc123f MM |
7237 | method_type = build_method_type_directly (TYPE_MAIN_VARIANT (r), |
7238 | TREE_TYPE (type), | |
7239 | TYPE_ARG_TYPES (type)); | |
a5ac359a MM |
7240 | return build_ptrmemfunc_type (build_pointer_type (method_type)); |
7241 | } | |
46c895ac | 7242 | else |
b7a78333 MM |
7243 | return cp_build_qualified_type_real (build_ptrmem_type (r, type), |
7244 | TYPE_QUALS (t), | |
7245 | complain); | |
0ecfe0b4 | 7246 | } |
8d08fdba MS |
7247 | case FUNCTION_TYPE: |
7248 | case METHOD_TYPE: | |
7249 | { | |
c11b6f21 | 7250 | tree fntype; |
c7222c02 | 7251 | tree specs; |
4393e105 MM |
7252 | fntype = tsubst_function_type (t, args, complain, in_decl); |
7253 | if (fntype == error_mark_node) | |
7254 | return error_mark_node; | |
cabc336a | 7255 | |
34cd5ae7 | 7256 | /* Substitute the exception specification. */ |
c7222c02 MM |
7257 | specs = tsubst_exception_specification (t, args, complain, |
7258 | in_decl); | |
7259 | if (specs) | |
7260 | fntype = build_exception_variant (fntype, specs); | |
c11b6f21 | 7261 | return fntype; |
8d08fdba MS |
7262 | } |
7263 | case ARRAY_TYPE: | |
7264 | { | |
4393e105 MM |
7265 | tree domain = tsubst (TYPE_DOMAIN (t), args, complain, in_decl); |
7266 | if (domain == error_mark_node) | |
7267 | return error_mark_node; | |
7268 | ||
7269 | /* As an optimization, we avoid regenerating the array type if | |
7270 | it will obviously be the same as T. */ | |
8d08fdba MS |
7271 | if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) |
7272 | return t; | |
0ecfe0b4 | 7273 | |
4393e105 MM |
7274 | /* These checks should match the ones in grokdeclarator. |
7275 | ||
7276 | [temp.deduct] | |
7277 | ||
7278 | The deduction may fail for any of the following reasons: | |
7279 | ||
7280 | -- Attempting to create an array with an element type that | |
cfb91b67 GB |
7281 | is void, a function type, or a reference type, or [DR337] |
7282 | an abstract class type. */ | |
4393e105 MM |
7283 | if (TREE_CODE (type) == VOID_TYPE |
7284 | || TREE_CODE (type) == FUNCTION_TYPE | |
7285 | || TREE_CODE (type) == REFERENCE_TYPE) | |
0ecfe0b4 | 7286 | { |
c2ea3a40 | 7287 | if (complain & tf_error) |
0f51ccfc | 7288 | error ("creating array of %qT", type); |
4393e105 | 7289 | return error_mark_node; |
0ecfe0b4 | 7290 | } |
cfb91b67 GB |
7291 | if (CLASS_TYPE_P (type) && CLASSTYPE_PURE_VIRTUALS (type)) |
7292 | { | |
7293 | if (complain & tf_error) | |
0f51ccfc | 7294 | error ("creating array of %qT, which is an abstract class type", |
cfb91b67 GB |
7295 | type); |
7296 | return error_mark_node; | |
7297 | } | |
0ecfe0b4 | 7298 | |
8d08fdba MS |
7299 | r = build_cplus_array_type (type, domain); |
7300 | return r; | |
7301 | } | |
7302 | ||
8d08fdba | 7303 | case PLUS_EXPR: |
5566b478 | 7304 | case MINUS_EXPR: |
4393e105 | 7305 | { |
c2ea3a40 NS |
7306 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl); |
7307 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl); | |
4393e105 MM |
7308 | |
7309 | if (e1 == error_mark_node || e2 == error_mark_node) | |
7310 | return error_mark_node; | |
7311 | ||
f293ce4b | 7312 | return fold (build2 (TREE_CODE (t), TREE_TYPE (t), e1, e2)); |
4393e105 | 7313 | } |
8d08fdba MS |
7314 | |
7315 | case NEGATE_EXPR: | |
7316 | case NOP_EXPR: | |
4393e105 | 7317 | { |
c2ea3a40 | 7318 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl); |
4393e105 MM |
7319 | if (e == error_mark_node) |
7320 | return error_mark_node; | |
7321 | ||
f293ce4b | 7322 | return fold (build1 (TREE_CODE (t), TREE_TYPE (t), e)); |
4393e105 | 7323 | } |
8d08fdba | 7324 | |
5566b478 MS |
7325 | case TYPENAME_TYPE: |
7326 | { | |
4393e105 MM |
7327 | tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain, |
7328 | in_decl, /*entering_scope=*/1); | |
7329 | tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args, | |
7330 | complain, in_decl); | |
7331 | ||
7332 | if (ctx == error_mark_node || f == error_mark_node) | |
7333 | return error_mark_node; | |
ae58fa02 | 7334 | |
bf8f3f93 MM |
7335 | if (!IS_AGGR_TYPE (ctx)) |
7336 | { | |
c2ea3a40 | 7337 | if (complain & tf_error) |
0f51ccfc | 7338 | error ("%qT is not a class, struct, or union type", ctx); |
bf8f3f93 MM |
7339 | return error_mark_node; |
7340 | } | |
7341 | else if (!uses_template_parms (ctx) && !TYPE_BEING_DEFINED (ctx)) | |
7342 | { | |
7343 | /* Normally, make_typename_type does not require that the CTX | |
7344 | have complete type in order to allow things like: | |
ae58fa02 | 7345 | |
bf8f3f93 | 7346 | template <class T> struct S { typename S<T>::X Y; }; |
ae58fa02 | 7347 | |
bf8f3f93 MM |
7348 | But, such constructs have already been resolved by this |
7349 | point, so here CTX really should have complete type, unless | |
7350 | it's a partial instantiation. */ | |
4393e105 | 7351 | ctx = complete_type (ctx); |
d0f062fb | 7352 | if (!COMPLETE_TYPE_P (ctx)) |
4393e105 | 7353 | { |
c2ea3a40 | 7354 | if (complain & tf_error) |
7a228918 | 7355 | cxx_incomplete_type_error (NULL_TREE, ctx); |
4393e105 MM |
7356 | return error_mark_node; |
7357 | } | |
7358 | } | |
ae58fa02 | 7359 | |
fc6a28d7 | 7360 | f = make_typename_type (ctx, f, typename_type, |
4f2b0fb2 | 7361 | (complain & tf_error) | tf_keep_type_decl); |
f0bcd168 MM |
7362 | if (f == error_mark_node) |
7363 | return f; | |
4f2b0fb2 NS |
7364 | if (TREE_CODE (f) == TYPE_DECL) |
7365 | { | |
7366 | complain |= tf_ignore_bad_quals; | |
7367 | f = TREE_TYPE (f); | |
7368 | } | |
7369 | ||
fc6a28d7 MM |
7370 | if (TREE_CODE (f) != TYPENAME_TYPE) |
7371 | { | |
7372 | if (TYPENAME_IS_ENUM_P (t) && TREE_CODE (f) != ENUMERAL_TYPE) | |
7373 | error ("%qT resolves to %qT, which is not an enumeration type", | |
7374 | t, f); | |
7375 | else if (TYPENAME_IS_CLASS_P (t) && !CLASS_TYPE_P (f)) | |
7376 | error ("%qT resolves to %qT, which is is not a class type", | |
7377 | t, f); | |
7378 | } | |
7379 | ||
4f2b0fb2 NS |
7380 | return cp_build_qualified_type_real |
7381 | (f, cp_type_quals (f) | cp_type_quals (t), complain); | |
5566b478 | 7382 | } |
c2ea3a40 | 7383 | |
b8c6534b KL |
7384 | case UNBOUND_CLASS_TEMPLATE: |
7385 | { | |
7386 | tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain, | |
7387 | in_decl, /*entering_scope=*/1); | |
7388 | tree name = TYPE_IDENTIFIER (t); | |
b939a023 | 7389 | tree parm_list = DECL_TEMPLATE_PARMS (TYPE_NAME (t)); |
b8c6534b KL |
7390 | |
7391 | if (ctx == error_mark_node || name == error_mark_node) | |
7392 | return error_mark_node; | |
7393 | ||
b939a023 KL |
7394 | if (parm_list) |
7395 | parm_list = tsubst_template_parms (parm_list, args, complain); | |
7396 | return make_unbound_class_template (ctx, name, parm_list, complain); | |
b8c6534b KL |
7397 | } |
7398 | ||
5566b478 | 7399 | case INDIRECT_REF: |
5566b478 | 7400 | case ADDR_EXPR: |
058b15c1 | 7401 | case CALL_EXPR: |
315fb5db | 7402 | gcc_unreachable (); |
5566b478 MS |
7403 | |
7404 | case ARRAY_REF: | |
4393e105 | 7405 | { |
c2ea3a40 NS |
7406 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl); |
7407 | tree e2 = tsubst_expr (TREE_OPERAND (t, 1), args, complain, in_decl); | |
4393e105 MM |
7408 | if (e1 == error_mark_node || e2 == error_mark_node) |
7409 | return error_mark_node; | |
7410 | ||
44de5aeb | 7411 | return build_nt (ARRAY_REF, e1, e2, NULL_TREE, NULL_TREE); |
4393e105 | 7412 | } |
5566b478 | 7413 | |
fc378698 | 7414 | case SCOPE_REF: |
4393e105 | 7415 | { |
c2ea3a40 | 7416 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl); |
4393e105 MM |
7417 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl); |
7418 | if (e1 == error_mark_node || e2 == error_mark_node) | |
7419 | return error_mark_node; | |
7420 | ||
718b8ea5 | 7421 | return build_nt (TREE_CODE (t), e1, e2); |
4393e105 | 7422 | } |
fc378698 | 7423 | |
b894fc05 | 7424 | case TYPEOF_TYPE: |
4393e105 | 7425 | { |
b830b74c | 7426 | tree type; |
4393e105 | 7427 | |
eb34af89 RK |
7428 | type = finish_typeof (tsubst_expr (TYPEOF_TYPE_EXPR (t), args, |
7429 | complain, in_decl)); | |
b830b74c | 7430 | return cp_build_qualified_type_real (type, |
dce50630 | 7431 | cp_type_quals (t) |
b830b74c | 7432 | | cp_type_quals (type), |
dce50630 | 7433 | complain); |
4393e105 | 7434 | } |
b894fc05 | 7435 | |
8d08fdba | 7436 | default: |
9e637a26 | 7437 | sorry ("use of %qs in template", |
8d08fdba MS |
7438 | tree_code_name [(int) TREE_CODE (t)]); |
7439 | return error_mark_node; | |
7440 | } | |
7441 | } | |
7442 | ||
ee76b931 MM |
7443 | /* Like tsubst_expr for a BASELINK. OBJECT_TYPE, if non-NULL, is the |
7444 | type of the expression on the left-hand side of the "." or "->" | |
7445 | operator. */ | |
7446 | ||
7447 | static tree | |
7448 | tsubst_baselink (tree baselink, tree object_type, | |
7449 | tree args, tsubst_flags_t complain, tree in_decl) | |
7450 | { | |
7451 | tree name; | |
7452 | tree qualifying_scope; | |
7453 | tree fns; | |
7454 | tree template_args = 0; | |
7455 | bool template_id_p = false; | |
7456 | ||
7457 | /* A baselink indicates a function from a base class. The | |
7458 | BASELINK_ACCESS_BINFO and BASELINK_BINFO are going to have | |
7459 | non-dependent types; otherwise, the lookup could not have | |
7460 | succeeded. However, they may indicate bases of the template | |
7461 | class, rather than the instantiated class. | |
7462 | ||
7463 | In addition, lookups that were not ambiguous before may be | |
04c06002 | 7464 | ambiguous now. Therefore, we perform the lookup again. */ |
ee76b931 MM |
7465 | qualifying_scope = BINFO_TYPE (BASELINK_ACCESS_BINFO (baselink)); |
7466 | fns = BASELINK_FUNCTIONS (baselink); | |
7467 | if (TREE_CODE (fns) == TEMPLATE_ID_EXPR) | |
7468 | { | |
7469 | template_id_p = true; | |
7470 | template_args = TREE_OPERAND (fns, 1); | |
7471 | fns = TREE_OPERAND (fns, 0); | |
bf12d54d NS |
7472 | if (template_args) |
7473 | template_args = tsubst_template_args (template_args, args, | |
7474 | complain, in_decl); | |
ee76b931 MM |
7475 | } |
7476 | name = DECL_NAME (get_first_fn (fns)); | |
7477 | baselink = lookup_fnfields (qualifying_scope, name, /*protect=*/1); | |
9b60dfd7 MM |
7478 | |
7479 | /* If lookup found a single function, mark it as used at this | |
7480 | point. (If it lookup found multiple functions the one selected | |
7481 | later by overload resolution will be marked as used at that | |
7482 | point.) */ | |
7483 | if (BASELINK_P (baselink)) | |
7484 | fns = BASELINK_FUNCTIONS (baselink); | |
7485 | if (!template_id_p && !really_overloaded_fn (fns)) | |
7486 | mark_used (OVL_CURRENT (fns)); | |
7487 | ||
7488 | /* Add back the template arguments, if present. */ | |
ee76b931 MM |
7489 | if (BASELINK_P (baselink) && template_id_p) |
7490 | BASELINK_FUNCTIONS (baselink) | |
7491 | = build_nt (TEMPLATE_ID_EXPR, | |
7492 | BASELINK_FUNCTIONS (baselink), | |
7493 | template_args); | |
9b60dfd7 | 7494 | |
ee76b931 MM |
7495 | if (!object_type) |
7496 | object_type = current_class_type; | |
7497 | return adjust_result_of_qualified_name_lookup (baselink, | |
7498 | qualifying_scope, | |
7499 | object_type); | |
7500 | } | |
7501 | ||
7502 | /* Like tsubst_expr for a SCOPE_REF, given by QUALIFIED_ID. DONE is | |
7503 | true if the qualified-id will be a postfix-expression in-and-of | |
7504 | itself; false if more of the postfix-expression follows the | |
7505 | QUALIFIED_ID. ADDRESS_P is true if the qualified-id is the operand | |
7506 | of "&". */ | |
7507 | ||
7508 | static tree | |
7509 | tsubst_qualified_id (tree qualified_id, tree args, | |
7510 | tsubst_flags_t complain, tree in_decl, | |
7511 | bool done, bool address_p) | |
7512 | { | |
7513 | tree expr; | |
7514 | tree scope; | |
7515 | tree name; | |
7516 | bool is_template; | |
7517 | tree template_args; | |
7518 | ||
50bc768d | 7519 | gcc_assert (TREE_CODE (qualified_id) == SCOPE_REF); |
ee76b931 | 7520 | |
ee76b931 MM |
7521 | /* Figure out what name to look up. */ |
7522 | name = TREE_OPERAND (qualified_id, 1); | |
7523 | if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
7524 | { | |
7525 | is_template = true; | |
bf12d54d NS |
7526 | template_args = TREE_OPERAND (name, 1); |
7527 | if (template_args) | |
7528 | template_args = tsubst_template_args (template_args, args, | |
7529 | complain, in_decl); | |
ee76b931 MM |
7530 | name = TREE_OPERAND (name, 0); |
7531 | } | |
7532 | else | |
7533 | { | |
7534 | is_template = false; | |
7535 | template_args = NULL_TREE; | |
7536 | } | |
7537 | ||
6eeba0cc MM |
7538 | /* Substitute into the qualifying scope. When there are no ARGS, we |
7539 | are just trying to simplify a non-dependent expression. In that | |
7540 | case the qualifying scope may be dependent, and, in any case, | |
7541 | substituting will not help. */ | |
7542 | scope = TREE_OPERAND (qualified_id, 0); | |
7543 | if (args) | |
7544 | { | |
7545 | scope = tsubst (scope, args, complain, in_decl); | |
7546 | expr = tsubst_copy (name, args, complain, in_decl); | |
7547 | } | |
7548 | else | |
7549 | expr = name; | |
10b1d5e7 | 7550 | |
ab73670a MM |
7551 | if (dependent_type_p (scope)) |
7552 | return build_nt (SCOPE_REF, scope, expr); | |
fb5ce3c9 | 7553 | |
5e08432e | 7554 | if (!BASELINK_P (name) && !DECL_P (expr)) |
12483c9f NS |
7555 | { |
7556 | expr = lookup_qualified_name (scope, expr, /*is_type_p=*/0, false); | |
7557 | if (TREE_CODE (TREE_CODE (expr) == TEMPLATE_DECL | |
7558 | ? DECL_TEMPLATE_RESULT (expr) : expr) == TYPE_DECL) | |
7559 | { | |
7560 | if (complain & tf_error) | |
b2693faf | 7561 | { |
0f51ccfc | 7562 | error ("dependent-name %qE is parsed as a non-type, but " |
b2693faf | 7563 | "instantiation yields a type", qualified_id); |
0f51ccfc | 7564 | inform ("say %<typename %E%> if a type is meant", qualified_id); |
b2693faf | 7565 | } |
12483c9f NS |
7566 | return error_mark_node; |
7567 | } | |
7568 | } | |
fb5ce3c9 | 7569 | |
279b8466 | 7570 | if (DECL_P (expr)) |
8f78f01f MM |
7571 | { |
7572 | check_accessibility_of_qualified_id (expr, /*object_type=*/NULL_TREE, | |
7573 | scope); | |
7574 | /* Remember that there was a reference to this entity. */ | |
7575 | mark_used (expr); | |
7576 | } | |
7577 | ||
7578 | if (expr == error_mark_node || TREE_CODE (expr) == TREE_LIST) | |
7579 | { | |
7580 | if (complain & tf_error) | |
7581 | qualified_name_lookup_error (scope, | |
7582 | TREE_OPERAND (qualified_id, 1), | |
7583 | expr); | |
7584 | return error_mark_node; | |
7585 | } | |
ee76b931 MM |
7586 | |
7587 | if (is_template) | |
10b1d5e7 | 7588 | expr = lookup_template_function (expr, template_args); |
ee76b931 | 7589 | |
22038b2c | 7590 | if (expr == error_mark_node && complain & tf_error) |
8f78f01f MM |
7591 | qualified_name_lookup_error (scope, TREE_OPERAND (qualified_id, 1), |
7592 | expr); | |
22038b2c | 7593 | else if (TYPE_P (scope)) |
ee76b931 MM |
7594 | { |
7595 | expr = (adjust_result_of_qualified_name_lookup | |
7596 | (expr, scope, current_class_type)); | |
7597 | expr = finish_qualified_id_expr (scope, expr, done, address_p); | |
7598 | } | |
5aa56f9d NS |
7599 | |
7600 | expr = convert_from_reference (expr); | |
ee76b931 MM |
7601 | |
7602 | return expr; | |
7603 | } | |
7604 | ||
00d3396f JM |
7605 | /* Like tsubst, but deals with expressions. This function just replaces |
7606 | template parms; to finish processing the resultant expression, use | |
7607 | tsubst_expr. */ | |
7608 | ||
14d22dd6 | 7609 | static tree |
3a978d72 | 7610 | tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl) |
5566b478 MS |
7611 | { |
7612 | enum tree_code code; | |
8452b1d3 | 7613 | tree r; |
8d08fdba | 7614 | |
5566b478 MS |
7615 | if (t == NULL_TREE || t == error_mark_node) |
7616 | return t; | |
7617 | ||
7618 | code = TREE_CODE (t); | |
b7484fbe | 7619 | |
5566b478 MS |
7620 | switch (code) |
7621 | { | |
7622 | case PARM_DECL: | |
a723baf1 | 7623 | r = retrieve_local_specialization (t); |
50bc768d | 7624 | gcc_assert (r != NULL); |
c0694c4b | 7625 | mark_used (r); |
a723baf1 | 7626 | return r; |
5566b478 MS |
7627 | |
7628 | case CONST_DECL: | |
ed44da02 MM |
7629 | { |
7630 | tree enum_type; | |
7631 | tree v; | |
7632 | ||
a723baf1 MM |
7633 | if (DECL_TEMPLATE_PARM_P (t)) |
7634 | return tsubst_copy (DECL_INITIAL (t), args, complain, in_decl); | |
7b6d72fc MM |
7635 | /* There is no need to substitute into namespace-scope |
7636 | enumerators. */ | |
7637 | if (DECL_NAMESPACE_SCOPE_P (t)) | |
ed44da02 | 7638 | return t; |
d5a10cf0 MM |
7639 | /* If ARGS is NULL, then T is known to be non-dependent. */ |
7640 | if (args == NULL_TREE) | |
8a784e4a | 7641 | return integral_constant_value (t); |
ed44da02 MM |
7642 | |
7643 | /* Unfortunately, we cannot just call lookup_name here. | |
9188c363 MM |
7644 | Consider: |
7645 | ||
7646 | template <int I> int f() { | |
7647 | enum E { a = I }; | |
7648 | struct S { void g() { E e = a; } }; | |
7649 | }; | |
7650 | ||
7651 | When we instantiate f<7>::S::g(), say, lookup_name is not | |
7652 | clever enough to find f<7>::a. */ | |
ed44da02 | 7653 | enum_type |
4393e105 | 7654 | = tsubst_aggr_type (TREE_TYPE (t), args, complain, in_decl, |
ed44da02 MM |
7655 | /*entering_scope=*/0); |
7656 | ||
7657 | for (v = TYPE_VALUES (enum_type); | |
7658 | v != NULL_TREE; | |
7659 | v = TREE_CHAIN (v)) | |
7660 | if (TREE_PURPOSE (v) == DECL_NAME (t)) | |
7661 | return TREE_VALUE (v); | |
7662 | ||
7663 | /* We didn't find the name. That should never happen; if | |
7664 | name-lookup found it during preliminary parsing, we | |
7665 | should find it again here during instantiation. */ | |
315fb5db | 7666 | gcc_unreachable (); |
ed44da02 | 7667 | } |
db04386f | 7668 | return t; |
ed44da02 | 7669 | |
5566b478 MS |
7670 | case FIELD_DECL: |
7671 | if (DECL_CONTEXT (t)) | |
7672 | { | |
0978790f | 7673 | tree ctx; |
0978790f | 7674 | |
4393e105 | 7675 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, complain, in_decl, |
36a117a5 | 7676 | /*entering_scope=*/1); |
0978790f | 7677 | if (ctx != DECL_CONTEXT (t)) |
bad1f462 KL |
7678 | { |
7679 | tree r = lookup_field (ctx, DECL_NAME (t), 0, false); | |
7680 | if (!r) | |
7681 | { | |
7682 | if (complain & tf_error) | |
7683 | error ("using invalid field %qD", t); | |
7684 | return error_mark_node; | |
7685 | } | |
7686 | return r; | |
7687 | } | |
5566b478 | 7688 | } |
fa743e8c | 7689 | |
5566b478 MS |
7690 | return t; |
7691 | ||
7692 | case VAR_DECL: | |
7693 | case FUNCTION_DECL: | |
a723baf1 MM |
7694 | if ((DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)) |
7695 | || local_variable_p (t)) | |
4393e105 | 7696 | t = tsubst (t, args, complain, in_decl); |
5566b478 MS |
7697 | mark_used (t); |
7698 | return t; | |
7699 | ||
a723baf1 | 7700 | case BASELINK: |
ee76b931 | 7701 | return tsubst_baselink (t, current_class_type, args, complain, in_decl); |
a723baf1 | 7702 | |
98c1c668 | 7703 | case TEMPLATE_DECL: |
a723baf1 MM |
7704 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t)) |
7705 | return tsubst (TREE_TYPE (DECL_TEMPLATE_RESULT (t)), | |
7706 | args, complain, in_decl); | |
c7222c02 | 7707 | else if (DECL_FUNCTION_TEMPLATE_P (t) && DECL_MEMBER_TEMPLATE_P (t)) |
4393e105 | 7708 | return tsubst (t, args, complain, in_decl); |
fcea7401 KL |
7709 | else if (DECL_CLASS_SCOPE_P (t) |
7710 | && uses_template_parms (DECL_CONTEXT (t))) | |
7711 | { | |
7712 | /* Template template argument like the following example need | |
7713 | special treatment: | |
7714 | ||
7715 | template <template <class> class TT> struct C {}; | |
7716 | template <class T> struct D { | |
7717 | template <class U> struct E {}; | |
7718 | C<E> c; // #1 | |
7719 | }; | |
7720 | D<int> d; // #2 | |
7721 | ||
7722 | We are processing the template argument `E' in #1 for | |
7723 | the template instantiation #2. Originally, `E' is a | |
7724 | TEMPLATE_DECL with `D<T>' as its DECL_CONTEXT. Now we | |
7725 | have to substitute this with one having context `D<int>'. */ | |
7726 | ||
7727 | tree context = tsubst (DECL_CONTEXT (t), args, complain, in_decl); | |
7728 | return lookup_field (context, DECL_NAME(t), 0, false); | |
7729 | } | |
98c1c668 | 7730 | else |
fcea7401 | 7731 | /* Ordinary template template argument. */ |
98c1c668 JM |
7732 | return t; |
7733 | ||
5566b478 MS |
7734 | case CAST_EXPR: |
7735 | case REINTERPRET_CAST_EXPR: | |
e92cc029 MS |
7736 | case CONST_CAST_EXPR: |
7737 | case STATIC_CAST_EXPR: | |
7738 | case DYNAMIC_CAST_EXPR: | |
51924768 | 7739 | case NOP_EXPR: |
5566b478 | 7740 | return build1 |
4393e105 MM |
7741 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
7742 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); | |
5566b478 MS |
7743 | |
7744 | case INDIRECT_REF: | |
5566b478 MS |
7745 | case NEGATE_EXPR: |
7746 | case TRUTH_NOT_EXPR: | |
b87692e5 | 7747 | case BIT_NOT_EXPR: |
5566b478 MS |
7748 | case ADDR_EXPR: |
7749 | case CONVERT_EXPR: /* Unary + */ | |
7750 | case SIZEOF_EXPR: | |
abff8e06 | 7751 | case ALIGNOF_EXPR: |
5566b478 | 7752 | case ARROW_EXPR: |
fc378698 | 7753 | case THROW_EXPR: |
5156628f | 7754 | case TYPEID_EXPR: |
f5733617 SS |
7755 | case REALPART_EXPR: |
7756 | case IMAGPART_EXPR: | |
5566b478 | 7757 | return build1 |
6a629cac | 7758 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
4393e105 | 7759 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); |
5566b478 | 7760 | |
a723baf1 MM |
7761 | case COMPONENT_REF: |
7762 | { | |
7763 | tree object; | |
7764 | tree name; | |
7765 | ||
7766 | object = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl); | |
7767 | name = TREE_OPERAND (t, 1); | |
7768 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
7769 | { | |
7770 | name = tsubst_copy (TREE_OPERAND (name, 0), args, | |
7771 | complain, in_decl); | |
7772 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); | |
7773 | } | |
7774 | else if (TREE_CODE (name) == SCOPE_REF | |
7775 | && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR) | |
7776 | { | |
7777 | tree base = tsubst_copy (TREE_OPERAND (name, 0), args, | |
7778 | complain, in_decl); | |
7779 | name = TREE_OPERAND (name, 1); | |
7780 | name = tsubst_copy (TREE_OPERAND (name, 0), args, | |
7781 | complain, in_decl); | |
7782 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); | |
7783 | name = build_nt (SCOPE_REF, base, name); | |
7784 | } | |
ee76b931 MM |
7785 | else if (TREE_CODE (name) == BASELINK) |
7786 | name = tsubst_baselink (name, | |
7787 | non_reference (TREE_TYPE (object)), | |
7788 | args, complain, | |
7789 | in_decl); | |
a723baf1 | 7790 | else |
ee76b931 | 7791 | name = tsubst_copy (name, args, complain, in_decl); |
44de5aeb | 7792 | return build_nt (COMPONENT_REF, object, name, NULL_TREE); |
a723baf1 MM |
7793 | } |
7794 | ||
5566b478 MS |
7795 | case PLUS_EXPR: |
7796 | case MINUS_EXPR: | |
7797 | case MULT_EXPR: | |
7798 | case TRUNC_DIV_EXPR: | |
7799 | case CEIL_DIV_EXPR: | |
7800 | case FLOOR_DIV_EXPR: | |
7801 | case ROUND_DIV_EXPR: | |
7802 | case EXACT_DIV_EXPR: | |
7803 | case BIT_AND_EXPR: | |
5566b478 MS |
7804 | case BIT_IOR_EXPR: |
7805 | case BIT_XOR_EXPR: | |
7806 | case TRUNC_MOD_EXPR: | |
7807 | case FLOOR_MOD_EXPR: | |
7808 | case TRUTH_ANDIF_EXPR: | |
7809 | case TRUTH_ORIF_EXPR: | |
7810 | case TRUTH_AND_EXPR: | |
7811 | case TRUTH_OR_EXPR: | |
7812 | case RSHIFT_EXPR: | |
7813 | case LSHIFT_EXPR: | |
7814 | case RROTATE_EXPR: | |
7815 | case LROTATE_EXPR: | |
7816 | case EQ_EXPR: | |
7817 | case NE_EXPR: | |
7818 | case MAX_EXPR: | |
7819 | case MIN_EXPR: | |
7820 | case LE_EXPR: | |
7821 | case GE_EXPR: | |
7822 | case LT_EXPR: | |
7823 | case GT_EXPR: | |
5566b478 MS |
7824 | case COMPOUND_EXPR: |
7825 | case SCOPE_REF: | |
7826 | case DOTSTAR_EXPR: | |
7827 | case MEMBER_REF: | |
519c9806 MM |
7828 | case PREDECREMENT_EXPR: |
7829 | case PREINCREMENT_EXPR: | |
7830 | case POSTDECREMENT_EXPR: | |
7831 | case POSTINCREMENT_EXPR: | |
5566b478 | 7832 | return build_nt |
4393e105 MM |
7833 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7834 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 | 7835 | |
d8987adb NS |
7836 | case ARRAY_REF: |
7837 | return build_nt | |
7838 | (ARRAY_REF, | |
7839 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), | |
7840 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
7841 | NULL_TREE, NULL_TREE); | |
7842 | ||
5566b478 | 7843 | case CALL_EXPR: |
a723baf1 MM |
7844 | return build_nt (code, |
7845 | tsubst_copy (TREE_OPERAND (t, 0), args, | |
7846 | complain, in_decl), | |
7847 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, | |
7848 | in_decl), | |
7849 | NULL_TREE); | |
5566b478 | 7850 | |
5566b478 MS |
7851 | case COND_EXPR: |
7852 | case MODOP_EXPR: | |
40242ccf | 7853 | case PSEUDO_DTOR_EXPR: |
67da3287 | 7854 | { |
8452b1d3 | 7855 | r = build_nt |
4393e105 MM |
7856 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7857 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
7858 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
e4c2c34b | 7859 | TREE_NO_WARNING (r) = TREE_NO_WARNING (t); |
67da3287 MM |
7860 | return r; |
7861 | } | |
5566b478 MS |
7862 | |
7863 | case NEW_EXPR: | |
7864 | { | |
8452b1d3 | 7865 | r = build_nt |
4393e105 MM |
7866 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7867 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
7868 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
5566b478 MS |
7869 | NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t); |
7870 | return r; | |
7871 | } | |
7872 | ||
7873 | case DELETE_EXPR: | |
7874 | { | |
8452b1d3 | 7875 | r = build_nt |
4393e105 MM |
7876 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7877 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 MS |
7878 | DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t); |
7879 | DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t); | |
7880 | return r; | |
7881 | } | |
7882 | ||
386b8a85 JM |
7883 | case TEMPLATE_ID_EXPR: |
7884 | { | |
00d3396f | 7885 | /* Substituted template arguments */ |
a91db711 NS |
7886 | tree fn = TREE_OPERAND (t, 0); |
7887 | tree targs = TREE_OPERAND (t, 1); | |
856216bb | 7888 | |
a91db711 | 7889 | fn = tsubst_copy (fn, args, complain, in_decl); |
bf12d54d NS |
7890 | if (targs) |
7891 | targs = tsubst_template_args (targs, args, complain, in_decl); | |
a91db711 NS |
7892 | |
7893 | return lookup_template_function (fn, targs); | |
386b8a85 JM |
7894 | } |
7895 | ||
5566b478 MS |
7896 | case TREE_LIST: |
7897 | { | |
7898 | tree purpose, value, chain; | |
7899 | ||
7900 | if (t == void_list_node) | |
7901 | return t; | |
7902 | ||
7903 | purpose = TREE_PURPOSE (t); | |
7904 | if (purpose) | |
4393e105 | 7905 | purpose = tsubst_copy (purpose, args, complain, in_decl); |
5566b478 MS |
7906 | value = TREE_VALUE (t); |
7907 | if (value) | |
4393e105 | 7908 | value = tsubst_copy (value, args, complain, in_decl); |
5566b478 MS |
7909 | chain = TREE_CHAIN (t); |
7910 | if (chain && chain != void_type_node) | |
4393e105 | 7911 | chain = tsubst_copy (chain, args, complain, in_decl); |
5566b478 MS |
7912 | if (purpose == TREE_PURPOSE (t) |
7913 | && value == TREE_VALUE (t) | |
7914 | && chain == TREE_CHAIN (t)) | |
7915 | return t; | |
7916 | return tree_cons (purpose, value, chain); | |
7917 | } | |
7918 | ||
7919 | case RECORD_TYPE: | |
7920 | case UNION_TYPE: | |
7921 | case ENUMERAL_TYPE: | |
7922 | case INTEGER_TYPE: | |
7923 | case TEMPLATE_TYPE_PARM: | |
73b0fce8 | 7924 | case TEMPLATE_TEMPLATE_PARM: |
a1281f45 | 7925 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
f84b4be9 | 7926 | case TEMPLATE_PARM_INDEX: |
5566b478 MS |
7927 | case POINTER_TYPE: |
7928 | case REFERENCE_TYPE: | |
7929 | case OFFSET_TYPE: | |
7930 | case FUNCTION_TYPE: | |
7931 | case METHOD_TYPE: | |
7932 | case ARRAY_TYPE: | |
7933 | case TYPENAME_TYPE: | |
b8c6534b | 7934 | case UNBOUND_CLASS_TEMPLATE: |
2a2b1d56 | 7935 | case TYPEOF_TYPE: |
f84b4be9 | 7936 | case TYPE_DECL: |
4393e105 | 7937 | return tsubst (t, args, complain, in_decl); |
5566b478 | 7938 | |
e92cc029 | 7939 | case IDENTIFIER_NODE: |
421844e7 | 7940 | if (IDENTIFIER_TYPENAME_P (t)) |
1f6e1acc AS |
7941 | { |
7942 | tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
1f84ec23 | 7943 | return mangle_conv_op_name_for_type (new_type); |
1f6e1acc | 7944 | } |
e92cc029 MS |
7945 | else |
7946 | return t; | |
7947 | ||
5156628f | 7948 | case CONSTRUCTOR: |
8452b1d3 | 7949 | { |
dcf92453 ZW |
7950 | r = build_constructor |
7951 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
7952 | tsubst_copy (CONSTRUCTOR_ELTS (t), args, complain, in_decl)); | |
8452b1d3 JM |
7953 | TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t); |
7954 | return r; | |
7955 | } | |
5156628f | 7956 | |
371534a9 | 7957 | case VA_ARG_EXPR: |
ea333e1c | 7958 | return build_x_va_arg (tsubst_copy (TREE_OPERAND (t, 0), args, complain, |
c2ea3a40 NS |
7959 | in_decl), |
7960 | tsubst (TREE_TYPE (t), args, complain, in_decl)); | |
f9817201 | 7961 | |
543a0daa RH |
7962 | case CLEANUP_POINT_EXPR: |
7963 | /* We shouldn't have built any of these during initial template | |
7964 | generation. Instead, they should be built during instantiation | |
7965 | in response to the saved STMT_IS_FULL_EXPR_P setting. */ | |
315fb5db | 7966 | gcc_unreachable (); |
543a0daa | 7967 | |
5566b478 MS |
7968 | default: |
7969 | return t; | |
7970 | } | |
7971 | } | |
7972 | ||
cc23546e JO |
7973 | /* Like tsubst_copy for expressions, etc. but also does semantic |
7974 | processing. */ | |
00d3396f | 7975 | |
14d22dd6 | 7976 | static tree |
3a978d72 | 7977 | tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl) |
5566b478 | 7978 | { |
fd10dd09 | 7979 | tree stmt, tmp; |
558475f0 | 7980 | |
5566b478 MS |
7981 | if (t == NULL_TREE || t == error_mark_node) |
7982 | return t; | |
7983 | ||
93409b8c PB |
7984 | if (EXPR_HAS_LOCATION (t)) |
7985 | input_location = EXPR_LOCATION (t); | |
7c34ced1 RH |
7986 | if (STATEMENT_CODE_P (TREE_CODE (t))) |
7987 | current_stmt_tree ()->stmts_are_full_exprs_p = STMT_IS_FULL_EXPR_P (t); | |
7988 | ||
5566b478 | 7989 | switch (TREE_CODE (t)) |
8d08fdba | 7990 | { |
325c3691 RH |
7991 | case STATEMENT_LIST: |
7992 | { | |
7993 | tree_stmt_iterator i; | |
7994 | for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i)) | |
7995 | tsubst_expr (tsi_stmt (i), args, complain, in_decl); | |
7996 | break; | |
7997 | } | |
7998 | ||
558475f0 | 7999 | case CTOR_INITIALIZER: |
2282d28d MM |
8000 | finish_mem_initializers (tsubst_initializer_list |
8001 | (TREE_OPERAND (t, 0), args)); | |
8002 | break; | |
558475f0 | 8003 | |
5088b058 RH |
8004 | case RETURN_EXPR: |
8005 | finish_return_stmt (tsubst_expr (TREE_OPERAND (t, 0), | |
4393e105 | 8006 | args, complain, in_decl)); |
5566b478 MS |
8007 | break; |
8008 | ||
8009 | case EXPR_STMT: | |
7c34ced1 RH |
8010 | tmp = tsubst_expr (EXPR_STMT_EXPR (t), args, complain, in_decl); |
8011 | if (EXPR_STMT_STMT_EXPR_RESULT (t)) | |
8012 | finish_stmt_expr_expr (tmp, cur_stmt_expr); | |
8013 | else | |
8014 | finish_expr_stmt (tmp); | |
8015 | break; | |
5566b478 | 8016 | |
9da99f7d | 8017 | case USING_STMT: |
9da99f7d NS |
8018 | do_using_directive (tsubst_expr (USING_STMT_NAMESPACE (t), |
8019 | args, complain, in_decl)); | |
8020 | break; | |
8021 | ||
350fae66 | 8022 | case DECL_EXPR: |
5566b478 | 8023 | { |
e0942dcd MM |
8024 | tree decl; |
8025 | tree init; | |
5566b478 | 8026 | |
350fae66 | 8027 | decl = DECL_EXPR_DECL (t); |
acef433b MM |
8028 | if (TREE_CODE (decl) == LABEL_DECL) |
8029 | finish_label_decl (DECL_NAME (decl)); | |
fbfe8c9e NS |
8030 | else if (TREE_CODE (decl) == USING_DECL) |
8031 | { | |
8032 | tree scope = DECL_INITIAL (decl); | |
8033 | tree name = DECL_NAME (decl); | |
22038b2c | 8034 | tree decl; |
fbfe8c9e NS |
8035 | |
8036 | scope = tsubst_expr (scope, args, complain, in_decl); | |
22038b2c | 8037 | decl = lookup_qualified_name (scope, name, |
12483c9f NS |
8038 | /*is_type_p=*/false, |
8039 | /*complain=*/false); | |
8f78f01f MM |
8040 | if (decl == error_mark_node || TREE_CODE (decl) == TREE_LIST) |
8041 | qualified_name_lookup_error (scope, name, decl); | |
22038b2c | 8042 | else |
ed5f054f | 8043 | do_local_using_decl (decl, scope, name); |
fbfe8c9e | 8044 | } |
acef433b MM |
8045 | else |
8046 | { | |
8047 | init = DECL_INITIAL (decl); | |
8048 | decl = tsubst (decl, args, complain, in_decl); | |
ce2e5191 NS |
8049 | if (decl != error_mark_node) |
8050 | { | |
8051 | if (init) | |
8052 | DECL_INITIAL (decl) = error_mark_node; | |
8053 | /* By marking the declaration as instantiated, we avoid | |
8054 | trying to instantiate it. Since instantiate_decl can't | |
8055 | handle local variables, and since we've already done | |
8056 | all that needs to be done, that's the right thing to | |
8057 | do. */ | |
8058 | if (TREE_CODE (decl) == VAR_DECL) | |
8059 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
edebf865 MM |
8060 | if (TREE_CODE (decl) == VAR_DECL |
8061 | && ANON_AGGR_TYPE_P (TREE_TYPE (decl))) | |
8062 | /* Anonymous aggregates are a special case. */ | |
8063 | finish_anon_union (decl); | |
8064 | else | |
ed2fa432 | 8065 | { |
edebf865 | 8066 | maybe_push_decl (decl); |
39703eb9 MM |
8067 | if (TREE_CODE (decl) == VAR_DECL |
8068 | && DECL_PRETTY_FUNCTION_P (decl)) | |
edebf865 MM |
8069 | { |
8070 | /* For __PRETTY_FUNCTION__ we have to adjust the | |
8071 | initializer. */ | |
8072 | const char *const name | |
8073 | = cxx_printable_name (current_function_decl, 2); | |
bb885938 | 8074 | init = cp_fname_init (name, &TREE_TYPE (decl)); |
edebf865 MM |
8075 | } |
8076 | else | |
8077 | init = tsubst_expr (init, args, complain, in_decl); | |
8078 | cp_finish_decl (decl, init, NULL_TREE, 0); | |
ed2fa432 | 8079 | } |
ce2e5191 | 8080 | } |
acef433b | 8081 | } |
fd10dd09 | 8082 | |
350fae66 | 8083 | /* A DECL_EXPR can also be used as an expression, in the condition |
325c3691 RH |
8084 | clause of an if/for/while construct. */ |
8085 | return decl; | |
5566b478 | 8086 | } |
8d08fdba | 8087 | |
5566b478 | 8088 | case FOR_STMT: |
7c34ced1 RH |
8089 | stmt = begin_for_stmt (); |
8090 | tsubst_expr (FOR_INIT_STMT (t), args, complain, in_decl); | |
8091 | finish_for_init_stmt (stmt); | |
8092 | tmp = tsubst_expr (FOR_COND (t), args, complain, in_decl); | |
8093 | finish_for_cond (tmp, stmt); | |
8094 | tmp = tsubst_expr (FOR_EXPR (t), args, complain, in_decl); | |
8095 | finish_for_expr (tmp, stmt); | |
8096 | tsubst_expr (FOR_BODY (t), args, complain, in_decl); | |
8097 | finish_for_stmt (stmt); | |
5566b478 | 8098 | break; |
8d08fdba | 8099 | |
5566b478 | 8100 | case WHILE_STMT: |
7c34ced1 RH |
8101 | stmt = begin_while_stmt (); |
8102 | tmp = tsubst_expr (WHILE_COND (t), args, complain, in_decl); | |
8103 | finish_while_stmt_cond (tmp, stmt); | |
8104 | tsubst_expr (WHILE_BODY (t), args, complain, in_decl); | |
8105 | finish_while_stmt (stmt); | |
5566b478 | 8106 | break; |
8d08fdba | 8107 | |
5566b478 | 8108 | case DO_STMT: |
7c34ced1 RH |
8109 | stmt = begin_do_stmt (); |
8110 | tsubst_expr (DO_BODY (t), args, complain, in_decl); | |
8111 | finish_do_body (stmt); | |
8112 | tmp = tsubst_expr (DO_COND (t), args, complain, in_decl); | |
8113 | finish_do_stmt (tmp, stmt); | |
5566b478 | 8114 | break; |
a0a33927 | 8115 | |
5566b478 | 8116 | case IF_STMT: |
7c34ced1 RH |
8117 | stmt = begin_if_stmt (); |
8118 | tmp = tsubst_expr (IF_COND (t), args, complain, in_decl); | |
8119 | finish_if_stmt_cond (tmp, stmt); | |
8120 | tsubst_expr (THEN_CLAUSE (t), args, complain, in_decl); | |
8121 | finish_then_clause (stmt); | |
8d08fdba | 8122 | |
7c34ced1 RH |
8123 | if (ELSE_CLAUSE (t)) |
8124 | { | |
8125 | begin_else_clause (stmt); | |
8126 | tsubst_expr (ELSE_CLAUSE (t), args, complain, in_decl); | |
8127 | finish_else_clause (stmt); | |
8128 | } | |
8129 | ||
8130 | finish_if_stmt (stmt); | |
5566b478 | 8131 | break; |
8d08fdba | 8132 | |
5882f0f3 | 8133 | case BIND_EXPR: |
7c34ced1 RH |
8134 | if (BIND_EXPR_BODY_BLOCK (t)) |
8135 | stmt = begin_function_body (); | |
8136 | else | |
8137 | stmt = begin_compound_stmt (BIND_EXPR_TRY_BLOCK (t) | |
8138 | ? BCS_TRY_BLOCK : 0); | |
ade3dc07 | 8139 | |
7c34ced1 | 8140 | tsubst_expr (BIND_EXPR_BODY (t), args, complain, in_decl); |
ade3dc07 | 8141 | |
7c34ced1 RH |
8142 | if (BIND_EXPR_BODY_BLOCK (t)) |
8143 | finish_function_body (stmt); | |
8144 | else | |
8145 | finish_compound_stmt (stmt); | |
5566b478 | 8146 | break; |
8d08fdba | 8147 | |
5566b478 | 8148 | case BREAK_STMT: |
ad321293 | 8149 | finish_break_stmt (); |
5566b478 | 8150 | break; |
8d08fdba | 8151 | |
6467930b | 8152 | case CONTINUE_STMT: |
ad321293 | 8153 | finish_continue_stmt (); |
6467930b MS |
8154 | break; |
8155 | ||
5566b478 | 8156 | case SWITCH_STMT: |
7c34ced1 | 8157 | stmt = begin_switch_stmt (); |
ebaae582 | 8158 | tmp = tsubst_expr (SWITCH_STMT_COND (t), args, complain, in_decl); |
7c34ced1 | 8159 | finish_switch_cond (tmp, stmt); |
ebaae582 | 8160 | tsubst_expr (SWITCH_STMT_BODY (t), args, complain, in_decl); |
7c34ced1 | 8161 | finish_switch_stmt (stmt); |
5566b478 MS |
8162 | break; |
8163 | ||
8c161995 | 8164 | case CASE_LABEL_EXPR: |
4393e105 | 8165 | finish_case_label (tsubst_expr (CASE_LOW (t), args, complain, in_decl), |
56cb9733 MM |
8166 | tsubst_expr (CASE_HIGH (t), args, complain, |
8167 | in_decl)); | |
5566b478 MS |
8168 | break; |
8169 | ||
9e14e18f | 8170 | case LABEL_EXPR: |
9e14e18f | 8171 | finish_label_stmt (DECL_NAME (LABEL_EXPR_LABEL (t))); |
5566b478 MS |
8172 | break; |
8173 | ||
9e14e18f | 8174 | case GOTO_EXPR: |
fd10dd09 JM |
8175 | tmp = GOTO_DESTINATION (t); |
8176 | if (TREE_CODE (tmp) != LABEL_DECL) | |
aa09da44 MM |
8177 | /* Computed goto's must be tsubst'd into. On the other hand, |
8178 | non-computed gotos must not be; the identifier in question | |
8179 | will have no binding. */ | |
fd10dd09 | 8180 | tmp = tsubst_expr (tmp, args, complain, in_decl); |
3fa56191 | 8181 | else |
fd10dd09 JM |
8182 | tmp = DECL_NAME (tmp); |
8183 | finish_goto_stmt (tmp); | |
ad321293 MM |
8184 | break; |
8185 | ||
e130a54b | 8186 | case ASM_EXPR: |
c87978aa | 8187 | tmp = finish_asm_stmt |
6de9cd9a | 8188 | (ASM_VOLATILE_P (t), |
c87978aa JM |
8189 | tsubst_expr (ASM_STRING (t), args, complain, in_decl), |
8190 | tsubst_expr (ASM_OUTPUTS (t), args, complain, in_decl), | |
8191 | tsubst_expr (ASM_INPUTS (t), args, complain, in_decl), | |
8192 | tsubst_expr (ASM_CLOBBERS (t), args, complain, in_decl)); | |
131263fa AP |
8193 | { |
8194 | tree asm_expr = tmp; | |
8195 | if (TREE_CODE (asm_expr) == CLEANUP_POINT_EXPR) | |
8196 | asm_expr = TREE_OPERAND (asm_expr, 0); | |
8197 | ASM_INPUT_P (asm_expr) = ASM_INPUT_P (t); | |
8198 | } | |
5566b478 | 8199 | break; |
faf5394a MS |
8200 | |
8201 | case TRY_BLOCK: | |
f1dedc31 | 8202 | if (CLEANUP_P (t)) |
62409b39 | 8203 | { |
57b52417 | 8204 | stmt = begin_try_block (); |
62409b39 MM |
8205 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); |
8206 | finish_cleanup_try_block (stmt); | |
8207 | finish_cleanup (tsubst_expr (TRY_HANDLERS (t), args, | |
8208 | complain, in_decl), | |
8209 | stmt); | |
8210 | } | |
f1dedc31 MM |
8211 | else |
8212 | { | |
62409b39 MM |
8213 | if (FN_TRY_BLOCK_P (t)) |
8214 | stmt = begin_function_try_block (); | |
8215 | else | |
8216 | stmt = begin_try_block (); | |
8217 | ||
8218 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); | |
8219 | ||
8220 | if (FN_TRY_BLOCK_P (t)) | |
8221 | finish_function_try_block (stmt); | |
8222 | else | |
8223 | finish_try_block (stmt); | |
8224 | ||
fd10dd09 | 8225 | tsubst_expr (TRY_HANDLERS (t), args, complain, in_decl); |
84df082b MM |
8226 | if (FN_TRY_BLOCK_P (t)) |
8227 | finish_function_handler_sequence (stmt); | |
8228 | else | |
8229 | finish_handler_sequence (stmt); | |
f1dedc31 | 8230 | } |
faf5394a | 8231 | break; |
b35d4555 | 8232 | |
faf5394a | 8233 | case HANDLER: |
b35d4555 MM |
8234 | { |
8235 | tree decl; | |
b35d4555 | 8236 | |
b35d4555 MM |
8237 | stmt = begin_handler (); |
8238 | if (HANDLER_PARMS (t)) | |
8239 | { | |
325c3691 | 8240 | decl = HANDLER_PARMS (t); |
b35d4555 | 8241 | decl = tsubst (decl, args, complain, in_decl); |
f8191e64 MM |
8242 | /* Prevent instantiate_decl from trying to instantiate |
8243 | this variable. We've already done all that needs to be | |
8244 | done. */ | |
8245 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
b35d4555 MM |
8246 | } |
8247 | else | |
8248 | decl = NULL_TREE; | |
1a6025b4 | 8249 | finish_handler_parms (decl, stmt); |
b35d4555 | 8250 | tsubst_expr (HANDLER_BODY (t), args, complain, in_decl); |
1a6025b4 | 8251 | finish_handler (stmt); |
b35d4555 | 8252 | } |
faf5394a MS |
8253 | break; |
8254 | ||
b87692e5 | 8255 | case TAG_DEFN: |
fd10dd09 | 8256 | tsubst (TREE_TYPE (t), args, complain, NULL_TREE); |
b87692e5 MS |
8257 | break; |
8258 | ||
5566b478 | 8259 | default: |
315fb5db NS |
8260 | gcc_assert (!STATEMENT_CODE_P (TREE_CODE (t))); |
8261 | ||
8262 | return tsubst_copy_and_build (t, args, complain, in_decl, | |
8263 | /*function_p=*/false); | |
5566b478 | 8264 | } |
fd10dd09 | 8265 | |
325c3691 | 8266 | return NULL_TREE; |
8d08fdba MS |
8267 | } |
8268 | ||
b3445994 MM |
8269 | /* T is a postfix-expression that is not being used in a function |
8270 | call. Return the substituted version of T. */ | |
8271 | ||
8272 | static tree | |
8273 | tsubst_non_call_postfix_expression (tree t, tree args, | |
8274 | tsubst_flags_t complain, | |
8275 | tree in_decl) | |
8276 | { | |
8277 | if (TREE_CODE (t) == SCOPE_REF) | |
8278 | t = tsubst_qualified_id (t, args, complain, in_decl, | |
8279 | /*done=*/false, /*address_p=*/false); | |
8280 | else | |
8281 | t = tsubst_copy_and_build (t, args, complain, in_decl, | |
8282 | /*function_p=*/false); | |
8283 | ||
8284 | return t; | |
8285 | } | |
8286 | ||
cc23546e | 8287 | /* Like tsubst but deals with expressions and performs semantic |
b3445994 | 8288 | analysis. FUNCTION_P is true if T is the "F" in "F (ARGS)". */ |
cc23546e | 8289 | |
ee76b931 | 8290 | tree |
3a978d72 NN |
8291 | tsubst_copy_and_build (tree t, |
8292 | tree args, | |
8293 | tsubst_flags_t complain, | |
b3445994 MM |
8294 | tree in_decl, |
8295 | bool function_p) | |
cc23546e | 8296 | { |
b3445994 MM |
8297 | #define RECUR(NODE) \ |
8298 | tsubst_copy_and_build (NODE, args, complain, in_decl, /*function_p=*/false) | |
8299 | ||
ee76b931 MM |
8300 | tree op1; |
8301 | ||
cc23546e JO |
8302 | if (t == NULL_TREE || t == error_mark_node) |
8303 | return t; | |
8304 | ||
8305 | switch (TREE_CODE (t)) | |
8306 | { | |
399dedb9 NS |
8307 | case USING_DECL: |
8308 | t = DECL_NAME (t); | |
852dcbdd | 8309 | /* Fall through. */ |
b3445994 | 8310 | case IDENTIFIER_NODE: |
cc23546e | 8311 | { |
b3445994 | 8312 | tree decl; |
b3445994 MM |
8313 | cp_id_kind idk; |
8314 | tree qualifying_class; | |
67c03833 | 8315 | bool non_integral_constant_expression_p; |
b3445994 MM |
8316 | const char *error_msg; |
8317 | ||
b3445994 | 8318 | if (IDENTIFIER_TYPENAME_P (t)) |
cc23546e | 8319 | { |
b3445994 MM |
8320 | tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl); |
8321 | t = mangle_conv_op_name_for_type (new_type); | |
cc23546e | 8322 | } |
b3445994 MM |
8323 | |
8324 | /* Look up the name. */ | |
10b1d5e7 | 8325 | decl = lookup_name (t, 0); |
b3445994 MM |
8326 | |
8327 | /* By convention, expressions use ERROR_MARK_NODE to indicate | |
8328 | failure, not NULL_TREE. */ | |
8329 | if (decl == NULL_TREE) | |
8330 | decl = error_mark_node; | |
8331 | ||
10b1d5e7 | 8332 | decl = finish_id_expression (t, decl, NULL_TREE, |
b3445994 MM |
8333 | &idk, |
8334 | &qualifying_class, | |
67c03833 JM |
8335 | /*integral_constant_expression_p=*/false, |
8336 | /*allow_non_integral_constant_expression_p=*/false, | |
8337 | &non_integral_constant_expression_p, | |
b3445994 MM |
8338 | &error_msg); |
8339 | if (error_msg) | |
8340 | error (error_msg); | |
8341 | if (!function_p && TREE_CODE (decl) == IDENTIFIER_NODE) | |
8342 | decl = unqualified_name_lookup_error (decl); | |
8343 | return decl; | |
cc23546e JO |
8344 | } |
8345 | ||
8346 | case TEMPLATE_ID_EXPR: | |
8347 | { | |
8348 | tree object; | |
b3445994 | 8349 | tree template = RECUR (TREE_OPERAND (t, 0)); |
bf12d54d NS |
8350 | tree targs = TREE_OPERAND (t, 1); |
8351 | ||
8352 | if (targs) | |
8353 | targs = tsubst_template_args (targs, args, complain, in_decl); | |
cc23546e JO |
8354 | |
8355 | if (TREE_CODE (template) == COMPONENT_REF) | |
8356 | { | |
8357 | object = TREE_OPERAND (template, 0); | |
8358 | template = TREE_OPERAND (template, 1); | |
8359 | } | |
8360 | else | |
8361 | object = NULL_TREE; | |
bd83b409 | 8362 | template = lookup_template_function (template, targs); |
cc23546e JO |
8363 | |
8364 | if (object) | |
f293ce4b RS |
8365 | return build3 (COMPONENT_REF, TREE_TYPE (template), |
8366 | object, template, NULL_TREE); | |
cc23546e JO |
8367 | else |
8368 | return template; | |
8369 | } | |
8370 | ||
8371 | case INDIRECT_REF: | |
db24eb1f NS |
8372 | { |
8373 | tree r = RECUR (TREE_OPERAND (t, 0)); | |
8374 | ||
8375 | if (REFERENCE_REF_P (t)) | |
8376 | { | |
e8c66fe0 NS |
8377 | /* A type conversion to reference type will be enclosed in |
8378 | such an indirect ref, but the substitution of the cast | |
8379 | will have also added such an indirect ref. */ | |
8380 | if (TREE_CODE (TREE_TYPE (r)) == REFERENCE_TYPE) | |
8381 | r = convert_from_reference (r); | |
db24eb1f NS |
8382 | } |
8383 | else | |
8384 | r = build_x_indirect_ref (r, "unary *"); | |
8385 | return r; | |
8386 | } | |
cc23546e | 8387 | |
0da99d4e GB |
8388 | case NOP_EXPR: |
8389 | return build_nop | |
8390 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
8391 | RECUR (TREE_OPERAND (t, 0))); | |
8392 | ||
cc23546e JO |
8393 | case CAST_EXPR: |
8394 | return build_functional_cast | |
8395 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
b3445994 | 8396 | RECUR (TREE_OPERAND (t, 0))); |
cc23546e JO |
8397 | |
8398 | case REINTERPRET_CAST_EXPR: | |
8399 | return build_reinterpret_cast | |
8400 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
b3445994 | 8401 | RECUR (TREE_OPERAND (t, 0))); |
cc23546e JO |
8402 | |
8403 | case CONST_CAST_EXPR: | |
8404 | return build_const_cast | |
8405 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
b3445994 | 8406 | RECUR (TREE_OPERAND (t, 0))); |
cc23546e JO |
8407 | |
8408 | case DYNAMIC_CAST_EXPR: | |
8409 | return build_dynamic_cast | |
8410 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
b3445994 | 8411 | RECUR (TREE_OPERAND (t, 0))); |
cc23546e JO |
8412 | |
8413 | case STATIC_CAST_EXPR: | |
8414 | return build_static_cast | |
8415 | (tsubst (TREE_TYPE (t), args, complain, in_decl), | |
b3445994 | 8416 | RECUR (TREE_OPERAND (t, 0))); |
cc23546e | 8417 | |
cc23546e JO |
8418 | case POSTDECREMENT_EXPR: |
8419 | case POSTINCREMENT_EXPR: | |
b3445994 MM |
8420 | op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0), |
8421 | args, complain, in_decl); | |
ee76b931 MM |
8422 | return build_x_unary_op (TREE_CODE (t), op1); |
8423 | ||
8424 | case PREDECREMENT_EXPR: | |
8425 | case PREINCREMENT_EXPR: | |
cc23546e JO |
8426 | case NEGATE_EXPR: |
8427 | case BIT_NOT_EXPR: | |
cc23546e | 8428 | case ABS_EXPR: |
d17811fd MM |
8429 | case TRUTH_NOT_EXPR: |
8430 | case CONVERT_EXPR: /* Unary + */ | |
8431 | case REALPART_EXPR: | |
8432 | case IMAGPART_EXPR: | |
b3445994 | 8433 | return build_x_unary_op (TREE_CODE (t), RECUR (TREE_OPERAND (t, 0))); |
cc23546e | 8434 | |
cc23546e | 8435 | case ADDR_EXPR: |
ee76b931 MM |
8436 | op1 = TREE_OPERAND (t, 0); |
8437 | if (TREE_CODE (op1) == SCOPE_REF) | |
8438 | op1 = tsubst_qualified_id (op1, args, complain, in_decl, | |
8439 | /*done=*/true, /*address_p=*/true); | |
8440 | else | |
b3445994 MM |
8441 | op1 = tsubst_non_call_postfix_expression (op1, args, complain, |
8442 | in_decl); | |
fc2b8477 MM |
8443 | if (TREE_CODE (op1) == LABEL_DECL) |
8444 | return finish_label_address_expr (DECL_NAME (op1)); | |
ee76b931 MM |
8445 | return build_x_unary_op (ADDR_EXPR, op1); |
8446 | ||
cc23546e JO |
8447 | case PLUS_EXPR: |
8448 | case MINUS_EXPR: | |
8449 | case MULT_EXPR: | |
8450 | case TRUNC_DIV_EXPR: | |
8451 | case CEIL_DIV_EXPR: | |
8452 | case FLOOR_DIV_EXPR: | |
8453 | case ROUND_DIV_EXPR: | |
8454 | case EXACT_DIV_EXPR: | |
8455 | case BIT_AND_EXPR: | |
cc23546e JO |
8456 | case BIT_IOR_EXPR: |
8457 | case BIT_XOR_EXPR: | |
8458 | case TRUNC_MOD_EXPR: | |
8459 | case FLOOR_MOD_EXPR: | |
8460 | case TRUTH_ANDIF_EXPR: | |
8461 | case TRUTH_ORIF_EXPR: | |
8462 | case TRUTH_AND_EXPR: | |
8463 | case TRUTH_OR_EXPR: | |
8464 | case RSHIFT_EXPR: | |
8465 | case LSHIFT_EXPR: | |
8466 | case RROTATE_EXPR: | |
8467 | case LROTATE_EXPR: | |
8468 | case EQ_EXPR: | |
8469 | case NE_EXPR: | |
8470 | case MAX_EXPR: | |
8471 | case MIN_EXPR: | |
8472 | case LE_EXPR: | |
8473 | case GE_EXPR: | |
8474 | case LT_EXPR: | |
8475 | case GT_EXPR: | |
8476 | case MEMBER_REF: | |
b3445994 | 8477 | case DOTSTAR_EXPR: |
cc23546e JO |
8478 | return build_x_binary_op |
8479 | (TREE_CODE (t), | |
b3445994 | 8480 | RECUR (TREE_OPERAND (t, 0)), |
ec835fb2 MM |
8481 | RECUR (TREE_OPERAND (t, 1)), |
8482 | /*overloaded_p=*/NULL); | |
cc23546e JO |
8483 | |
8484 | case SCOPE_REF: | |
ee76b931 MM |
8485 | return tsubst_qualified_id (t, args, complain, in_decl, /*done=*/true, |
8486 | /*address_p=*/false); | |
cc23546e | 8487 | case ARRAY_REF: |
b3445994 MM |
8488 | op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0), |
8489 | args, complain, in_decl); | |
d8987adb NS |
8490 | return build_x_binary_op (ARRAY_REF, op1, RECUR (TREE_OPERAND (t, 1)), |
8491 | /*overloaded_p=*/NULL); | |
8492 | ||
cc23546e JO |
8493 | case SIZEOF_EXPR: |
8494 | case ALIGNOF_EXPR: | |
d17811fd MM |
8495 | op1 = TREE_OPERAND (t, 0); |
8496 | if (!args) | |
8497 | { | |
8498 | /* When there are no ARGS, we are trying to evaluate a | |
8499 | non-dependent expression from the parser. Trying to do | |
8500 | the substitutions may not work. */ | |
8501 | if (!TYPE_P (op1)) | |
8502 | op1 = TREE_TYPE (op1); | |
8503 | } | |
8504 | else | |
8505 | { | |
8506 | ++skip_evaluation; | |
b3445994 | 8507 | op1 = RECUR (op1); |
d17811fd MM |
8508 | --skip_evaluation; |
8509 | } | |
7a18b933 NS |
8510 | if (TYPE_P (op1)) |
8511 | return cxx_sizeof_or_alignof_type (op1, TREE_CODE (t), true); | |
d17811fd | 8512 | else |
7a18b933 | 8513 | return cxx_sizeof_or_alignof_expr (op1, TREE_CODE (t)); |
cc23546e JO |
8514 | |
8515 | case MODOP_EXPR: | |
e4c2c34b JM |
8516 | { |
8517 | tree r = build_x_modify_expr | |
8518 | (RECUR (TREE_OPERAND (t, 0)), | |
8519 | TREE_CODE (TREE_OPERAND (t, 1)), | |
8520 | RECUR (TREE_OPERAND (t, 2))); | |
bcf9a914 JM |
8521 | /* TREE_NO_WARNING must be set if either the expression was |
8522 | parenthesized or it uses an operator such as >>= rather | |
8523 | than plain assignment. In the former case, it was already | |
8524 | set and must be copied. In the latter case, | |
8525 | build_x_modify_expr sets it and it must not be reset | |
8526 | here. */ | |
8527 | if (TREE_NO_WARNING (t)) | |
8528 | TREE_NO_WARNING (r) = TREE_NO_WARNING (t); | |
e4c2c34b JM |
8529 | return r; |
8530 | } | |
cc23546e JO |
8531 | |
8532 | case ARROW_EXPR: | |
b3445994 MM |
8533 | op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0), |
8534 | args, complain, in_decl); | |
ee76b931 MM |
8535 | /* Remember that there was a reference to this entity. */ |
8536 | if (DECL_P (op1)) | |
8537 | mark_used (op1); | |
8538 | return build_x_arrow (op1); | |
cc23546e JO |
8539 | |
8540 | case NEW_EXPR: | |
8541 | return build_new | |
b3445994 MM |
8542 | (RECUR (TREE_OPERAND (t, 0)), |
8543 | RECUR (TREE_OPERAND (t, 1)), | |
8544 | RECUR (TREE_OPERAND (t, 2)), | |
058b15c1 | 8545 | RECUR (TREE_OPERAND (t, 3)), |
cc23546e JO |
8546 | NEW_EXPR_USE_GLOBAL (t)); |
8547 | ||
8548 | case DELETE_EXPR: | |
8549 | return delete_sanity | |
b3445994 MM |
8550 | (RECUR (TREE_OPERAND (t, 0)), |
8551 | RECUR (TREE_OPERAND (t, 1)), | |
cc23546e JO |
8552 | DELETE_EXPR_USE_VEC (t), |
8553 | DELETE_EXPR_USE_GLOBAL (t)); | |
8554 | ||
8555 | case COMPOUND_EXPR: | |
b3445994 MM |
8556 | return build_x_compound_expr (RECUR (TREE_OPERAND (t, 0)), |
8557 | RECUR (TREE_OPERAND (t, 1))); | |
cc23546e | 8558 | |
ee76b931 | 8559 | case CALL_EXPR: |
cc23546e | 8560 | { |
ee76b931 MM |
8561 | tree function; |
8562 | tree call_args; | |
ee76b931 | 8563 | bool qualified_p; |
ee935db4 | 8564 | bool koenig_p; |
ee76b931 MM |
8565 | |
8566 | function = TREE_OPERAND (t, 0); | |
6d80c4b9 MM |
8567 | /* When we parsed the expression, we determined whether or |
8568 | not Koenig lookup should be performed. */ | |
8569 | koenig_p = KOENIG_LOOKUP_P (t); | |
ee76b931 | 8570 | if (TREE_CODE (function) == SCOPE_REF) |
cc23546e | 8571 | { |
ee76b931 MM |
8572 | qualified_p = true; |
8573 | function = tsubst_qualified_id (function, args, complain, in_decl, | |
8574 | /*done=*/false, | |
8575 | /*address_p=*/false); | |
cc23546e | 8576 | } |
ee76b931 | 8577 | else |
cc23546e | 8578 | { |
ee76b931 MM |
8579 | qualified_p = (TREE_CODE (function) == COMPONENT_REF |
8580 | && (TREE_CODE (TREE_OPERAND (function, 1)) | |
8581 | == SCOPE_REF)); | |
8582 | function = tsubst_copy_and_build (function, args, complain, | |
b3445994 MM |
8583 | in_decl, |
8584 | !qualified_p); | |
6d80c4b9 MM |
8585 | if (BASELINK_P (function)) |
8586 | qualified_p = true; | |
cc23546e | 8587 | } |
cc23546e | 8588 | |
b3445994 | 8589 | call_args = RECUR (TREE_OPERAND (t, 1)); |
676e33ca MM |
8590 | |
8591 | /* We do not perform argument-dependent lookup if normal | |
8592 | lookup finds a non-function, in accordance with the | |
8593 | expected resolution of DR 218. */ | |
ee935db4 | 8594 | if (koenig_p |
44370687 MM |
8595 | && ((is_overloaded_fn (function) |
8596 | /* If lookup found a member function, the Koenig lookup is | |
8597 | not appropriate, even if an unqualified-name was used | |
8598 | to denote the function. */ | |
8599 | && !DECL_FUNCTION_MEMBER_P (get_first_fn (function))) | |
b3445994 | 8600 | || TREE_CODE (function) == IDENTIFIER_NODE)) |
6d80c4b9 MM |
8601 | function = perform_koenig_lookup (function, call_args); |
8602 | ||
8603 | if (TREE_CODE (function) == IDENTIFIER_NODE) | |
b3445994 | 8604 | { |
6d80c4b9 MM |
8605 | unqualified_name_lookup_error (function); |
8606 | return error_mark_node; | |
b3445994 MM |
8607 | } |
8608 | ||
8609 | /* Remember that there was a reference to this entity. */ | |
8610 | if (DECL_P (function)) | |
8611 | mark_used (function); | |
8612 | ||
d17811fd MM |
8613 | if (TREE_CODE (function) == OFFSET_REF) |
8614 | return build_offset_ref_call_from_tree (function, call_args); | |
8615 | if (TREE_CODE (function) == COMPONENT_REF) | |
9f880ef9 MM |
8616 | { |
8617 | if (!BASELINK_P (TREE_OPERAND (function, 1))) | |
8618 | return finish_call_expr (function, call_args, | |
8619 | /*disallow_virtual=*/false, | |
8620 | /*koenig_p=*/false); | |
8621 | else | |
8622 | return (build_new_method_call | |
8623 | (TREE_OPERAND (function, 0), | |
8624 | TREE_OPERAND (function, 1), | |
8625 | call_args, NULL_TREE, | |
8626 | qualified_p ? LOOKUP_NONVIRTUAL : LOOKUP_NORMAL)); | |
8627 | } | |
d17811fd | 8628 | return finish_call_expr (function, call_args, |
6d80c4b9 MM |
8629 | /*disallow_virtual=*/qualified_p, |
8630 | koenig_p); | |
cc23546e JO |
8631 | } |
8632 | ||
8633 | case COND_EXPR: | |
8634 | return build_x_conditional_expr | |
b3445994 MM |
8635 | (RECUR (TREE_OPERAND (t, 0)), |
8636 | RECUR (TREE_OPERAND (t, 1)), | |
8637 | RECUR (TREE_OPERAND (t, 2))); | |
cc23546e JO |
8638 | |
8639 | case PSEUDO_DTOR_EXPR: | |
8640 | return finish_pseudo_destructor_expr | |
b3445994 MM |
8641 | (RECUR (TREE_OPERAND (t, 0)), |
8642 | RECUR (TREE_OPERAND (t, 1)), | |
8643 | RECUR (TREE_OPERAND (t, 2))); | |
cc23546e JO |
8644 | |
8645 | case TREE_LIST: | |
8646 | { | |
8647 | tree purpose, value, chain; | |
8648 | ||
8649 | if (t == void_list_node) | |
8650 | return t; | |
8651 | ||
8652 | purpose = TREE_PURPOSE (t); | |
8653 | if (purpose) | |
b3445994 | 8654 | purpose = RECUR (purpose); |
cc23546e JO |
8655 | value = TREE_VALUE (t); |
8656 | if (value) | |
b3445994 | 8657 | value = RECUR (value); |
cc23546e JO |
8658 | chain = TREE_CHAIN (t); |
8659 | if (chain && chain != void_type_node) | |
b3445994 | 8660 | chain = RECUR (chain); |
cc23546e JO |
8661 | if (purpose == TREE_PURPOSE (t) |
8662 | && value == TREE_VALUE (t) | |
8663 | && chain == TREE_CHAIN (t)) | |
8664 | return t; | |
8665 | return tree_cons (purpose, value, chain); | |
8666 | } | |
8667 | ||
8668 | case COMPONENT_REF: | |
8669 | { | |
ee76b931 MM |
8670 | tree object; |
8671 | tree member; | |
8672 | ||
b3445994 MM |
8673 | object = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0), |
8674 | args, complain, in_decl); | |
ee76b931 MM |
8675 | /* Remember that there was a reference to this entity. */ |
8676 | if (DECL_P (object)) | |
8677 | mark_used (object); | |
8678 | ||
8679 | member = TREE_OPERAND (t, 1); | |
8680 | if (BASELINK_P (member)) | |
8681 | member = tsubst_baselink (member, | |
8682 | non_reference (TREE_TYPE (object)), | |
8683 | args, complain, in_decl); | |
8684 | else | |
8685 | member = tsubst_copy (member, args, complain, in_decl); | |
cc23546e | 8686 | |
bad1f462 KL |
8687 | if (member == error_mark_node) |
8688 | return error_mark_node; | |
8689 | else if (!CLASS_TYPE_P (TREE_TYPE (object))) | |
cc23546e JO |
8690 | { |
8691 | if (TREE_CODE (member) == BIT_NOT_EXPR) | |
8692 | return finish_pseudo_destructor_expr (object, | |
8693 | NULL_TREE, | |
8694 | TREE_TYPE (object)); | |
8695 | else if (TREE_CODE (member) == SCOPE_REF | |
8696 | && (TREE_CODE (TREE_OPERAND (member, 1)) == BIT_NOT_EXPR)) | |
8697 | return finish_pseudo_destructor_expr (object, | |
8698 | object, | |
8699 | TREE_TYPE (object)); | |
8700 | } | |
8701 | else if (TREE_CODE (member) == SCOPE_REF | |
8702 | && TREE_CODE (TREE_OPERAND (member, 1)) == TEMPLATE_ID_EXPR) | |
8703 | { | |
8704 | tree tmpl; | |
8705 | tree args; | |
8706 | ||
8707 | /* Lookup the template functions now that we know what the | |
8708 | scope is. */ | |
8709 | tmpl = TREE_OPERAND (TREE_OPERAND (member, 1), 0); | |
8710 | args = TREE_OPERAND (TREE_OPERAND (member, 1), 1); | |
22038b2c | 8711 | member = lookup_qualified_name (TREE_OPERAND (member, 0), tmpl, |
12483c9f NS |
8712 | /*is_type_p=*/false, |
8713 | /*complain=*/false); | |
cc23546e | 8714 | if (BASELINK_P (member)) |
44370687 MM |
8715 | { |
8716 | BASELINK_FUNCTIONS (member) | |
8717 | = build_nt (TEMPLATE_ID_EXPR, BASELINK_FUNCTIONS (member), | |
8718 | args); | |
8719 | member = (adjust_result_of_qualified_name_lookup | |
8720 | (member, BINFO_TYPE (BASELINK_BINFO (member)), | |
8721 | TREE_TYPE (object))); | |
8722 | } | |
cc23546e JO |
8723 | else |
8724 | { | |
8f78f01f MM |
8725 | qualified_name_lookup_error (TREE_TYPE (object), tmpl, |
8726 | member); | |
cc23546e JO |
8727 | return error_mark_node; |
8728 | } | |
8729 | } | |
2436b51f MM |
8730 | else if (TREE_CODE (member) == SCOPE_REF |
8731 | && !CLASS_TYPE_P (TREE_OPERAND (member, 0)) | |
8732 | && TREE_CODE (TREE_OPERAND (member, 0)) != NAMESPACE_DECL) | |
8733 | { | |
8734 | if (complain & tf_error) | |
8735 | { | |
8736 | if (TYPE_P (TREE_OPERAND (member, 0))) | |
0f51ccfc | 8737 | error ("%qT is not a class or namespace", |
2436b51f MM |
8738 | TREE_OPERAND (member, 0)); |
8739 | else | |
0f51ccfc | 8740 | error ("%qD is not a class or namespace", |
2436b51f MM |
8741 | TREE_OPERAND (member, 0)); |
8742 | } | |
8743 | return error_mark_node; | |
8744 | } | |
a3f10e50 NS |
8745 | else if (TREE_CODE (member) == FIELD_DECL) |
8746 | return finish_non_static_data_member (member, object, NULL_TREE); | |
cc23546e JO |
8747 | |
8748 | return finish_class_member_access_expr (object, member); | |
8749 | } | |
8750 | ||
8751 | case THROW_EXPR: | |
8752 | return build_throw | |
b3445994 | 8753 | (RECUR (TREE_OPERAND (t, 0))); |
cc23546e JO |
8754 | |
8755 | case CONSTRUCTOR: | |
8756 | { | |
8757 | tree r; | |
8758 | tree elts; | |
8759 | tree type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
8760 | bool purpose_p; | |
8761 | ||
8762 | /* digest_init will do the wrong thing if we let it. */ | |
8763 | if (type && TYPE_PTRMEMFUNC_P (type)) | |
8764 | return t; | |
8765 | ||
8766 | r = NULL_TREE; | |
8767 | /* We do not want to process the purpose of aggregate | |
8768 | initializers as they are identifier nodes which will be | |
8769 | looked up by digest_init. */ | |
8770 | purpose_p = !(type && IS_AGGR_TYPE (type)); | |
db77ef4c | 8771 | for (elts = CONSTRUCTOR_ELTS (t); |
cc23546e JO |
8772 | elts; |
8773 | elts = TREE_CHAIN (elts)) | |
8774 | { | |
8775 | tree purpose = TREE_PURPOSE (elts); | |
8776 | tree value = TREE_VALUE (elts); | |
8777 | ||
8778 | if (purpose && purpose_p) | |
b3445994 MM |
8779 | purpose = RECUR (purpose); |
8780 | value = RECUR (value); | |
cc23546e JO |
8781 | r = tree_cons (purpose, value, r); |
8782 | } | |
8783 | ||
dcf92453 | 8784 | r = build_constructor (NULL_TREE, nreverse (r)); |
cc23546e JO |
8785 | TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t); |
8786 | ||
8787 | if (type) | |
8788 | return digest_init (type, r, 0); | |
8789 | return r; | |
8790 | } | |
8791 | ||
8792 | case TYPEID_EXPR: | |
8793 | { | |
b3445994 | 8794 | tree operand_0 = RECUR (TREE_OPERAND (t, 0)); |
cc23546e JO |
8795 | if (TYPE_P (operand_0)) |
8796 | return get_typeid (operand_0); | |
8797 | return build_typeid (operand_0); | |
8798 | } | |
8799 | ||
cc23546e | 8800 | case VAR_DECL: |
db24eb1f NS |
8801 | if (!args) |
8802 | return t; | |
8803 | /* Fall through */ | |
8804 | ||
8805 | case PARM_DECL: | |
8806 | { | |
8807 | tree r = tsubst_copy (t, args, complain, in_decl); | |
8808 | ||
8809 | if (TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE) | |
8810 | /* If the original type was a reference, we'll be wrapped in | |
8811 | the appropriate INDIRECT_REF. */ | |
8812 | r = convert_from_reference (r); | |
8813 | return r; | |
8814 | } | |
cc23546e JO |
8815 | |
8816 | case VA_ARG_EXPR: | |
b3445994 MM |
8817 | return build_x_va_arg (RECUR (TREE_OPERAND (t, 0)), |
8818 | tsubst_copy (TREE_TYPE (t), args, complain, | |
8819 | in_decl)); | |
cc23546e | 8820 | |
4bceb077 RH |
8821 | case OFFSETOF_EXPR: |
8822 | return fold_offsetof (RECUR (TREE_OPERAND (t, 0))); | |
8823 | ||
0fe0caa6 RH |
8824 | case STMT_EXPR: |
8825 | { | |
8826 | tree old_stmt_expr = cur_stmt_expr; | |
8827 | tree stmt_expr = begin_stmt_expr (); | |
8828 | ||
8829 | cur_stmt_expr = stmt_expr; | |
8830 | tsubst_expr (STMT_EXPR_STMT (t), args, complain, in_decl); | |
8831 | stmt_expr = finish_stmt_expr (stmt_expr, false); | |
8832 | cur_stmt_expr = old_stmt_expr; | |
8833 | ||
8834 | return stmt_expr; | |
8835 | } | |
8836 | ||
a5201a91 MM |
8837 | case CONST_DECL: |
8838 | t = tsubst_copy (t, args, complain, in_decl); | |
8839 | /* As in finish_id_expression, we resolve enumeration constants | |
8840 | to their underlying values. */ | |
8841 | if (TREE_CODE (t) == CONST_DECL) | |
8842 | return DECL_INITIAL (t); | |
8843 | return t; | |
8844 | ||
cc23546e JO |
8845 | default: |
8846 | return tsubst_copy (t, args, complain, in_decl); | |
8847 | } | |
b3445994 MM |
8848 | |
8849 | #undef RECUR | |
cc23546e JO |
8850 | } |
8851 | ||
3e4a3562 NS |
8852 | /* Verify that the instantiated ARGS are valid. For type arguments, |
8853 | make sure that the type's linkage is ok. For non-type arguments, | |
34cd5ae7 | 8854 | make sure they are constants if they are integral or enumerations. |
9bcb9aae | 8855 | Emit an error under control of COMPLAIN, and return TRUE on error. */ |
3e4a3562 NS |
8856 | |
8857 | static bool | |
3a978d72 | 8858 | check_instantiated_args (tree tmpl, tree args, tsubst_flags_t complain) |
3e4a3562 NS |
8859 | { |
8860 | int ix, len = DECL_NTPARMS (tmpl); | |
8861 | bool result = false; | |
6c02751b | 8862 | bool error_p = complain & tf_error; |
3e4a3562 NS |
8863 | |
8864 | for (ix = 0; ix != len; ix++) | |
8865 | { | |
8866 | tree t = TREE_VEC_ELT (args, ix); | |
8867 | ||
8868 | if (TYPE_P (t)) | |
8869 | { | |
8870 | /* [basic.link]: A name with no linkage (notably, the name | |
8871 | of a class or enumeration declared in a local scope) | |
8872 | shall not be used to declare an entity with linkage. | |
8873 | This implies that names with no linkage cannot be used as | |
8874 | template arguments. */ | |
4684cd27 | 8875 | tree nt = no_linkage_check (t, /*relaxed_p=*/false); |
3e4a3562 NS |
8876 | |
8877 | if (nt) | |
8878 | { | |
aae4a277 | 8879 | if (TYPE_ANONYMOUS_P (nt)) |
6c02751b | 8880 | error ("%qT is/uses anonymous type", t); |
3e4a3562 | 8881 | else |
0f51ccfc | 8882 | error ("%qT uses local type %qT", t, nt); |
3e4a3562 | 8883 | result = true; |
6c02751b | 8884 | error_p = true; |
3e4a3562 NS |
8885 | } |
8886 | /* In order to avoid all sorts of complications, we do not | |
8887 | allow variably-modified types as template arguments. */ | |
5377d5ba | 8888 | else if (variably_modified_type_p (t, NULL_TREE)) |
3e4a3562 NS |
8889 | { |
8890 | if (complain & tf_error) | |
0f51ccfc | 8891 | error ("%qT is a variably modified type", t); |
3e4a3562 NS |
8892 | result = true; |
8893 | } | |
8894 | } | |
8895 | /* A non-type argument of integral or enumerated type must be a | |
8896 | constant. */ | |
8897 | else if (TREE_TYPE (t) | |
8898 | && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t)) | |
8899 | && !TREE_CONSTANT (t)) | |
8900 | { | |
8901 | if (complain & tf_error) | |
0f51ccfc | 8902 | error ("integral expression %qE is not constant", t); |
3e4a3562 NS |
8903 | result = true; |
8904 | } | |
8905 | } | |
6c02751b | 8906 | if (result && error_p) |
0f51ccfc | 8907 | error (" trying to instantiate %qD", tmpl); |
3e4a3562 NS |
8908 | return result; |
8909 | } | |
8910 | ||
6ba89f8e | 8911 | /* Instantiate the indicated variable or function template TMPL with |
36a117a5 MM |
8912 | the template arguments in TARG_PTR. */ |
8913 | ||
5566b478 | 8914 | tree |
3a978d72 | 8915 | instantiate_template (tree tmpl, tree targ_ptr, tsubst_flags_t complain) |
8d08fdba | 8916 | { |
5566b478 | 8917 | tree fndecl; |
36a117a5 MM |
8918 | tree gen_tmpl; |
8919 | tree spec; | |
5566b478 | 8920 | |
27fafc8d JM |
8921 | if (tmpl == error_mark_node) |
8922 | return error_mark_node; | |
8923 | ||
50bc768d | 8924 | gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL); |
386b8a85 | 8925 | |
db9b2174 MM |
8926 | /* If this function is a clone, handle it specially. */ |
8927 | if (DECL_CLONED_FUNCTION_P (tmpl)) | |
3ad97789 | 8928 | { |
a30f62e0 | 8929 | tree spec; |
3ad97789 NS |
8930 | tree clone; |
8931 | ||
a30f62e0 MM |
8932 | spec = instantiate_template (DECL_CLONED_FUNCTION (tmpl), targ_ptr, |
8933 | complain); | |
8934 | if (spec == error_mark_node) | |
8935 | return error_mark_node; | |
8936 | ||
c6002625 | 8937 | /* Look for the clone. */ |
4684cd27 | 8938 | FOR_EACH_CLONE (clone, spec) |
3ad97789 NS |
8939 | if (DECL_NAME (clone) == DECL_NAME (tmpl)) |
8940 | return clone; | |
8941 | /* We should always have found the clone by now. */ | |
315fb5db | 8942 | gcc_unreachable (); |
3ad97789 NS |
8943 | return NULL_TREE; |
8944 | } | |
8945 | ||
36a117a5 | 8946 | /* Check to see if we already have this specialization. */ |
c7222c02 MM |
8947 | spec = retrieve_specialization (tmpl, targ_ptr, |
8948 | /*class_specializations_p=*/false); | |
36a117a5 MM |
8949 | if (spec != NULL_TREE) |
8950 | return spec; | |
8951 | ||
f9a7ae04 MM |
8952 | gen_tmpl = most_general_template (tmpl); |
8953 | if (tmpl != gen_tmpl) | |
386b8a85 | 8954 | { |
36a117a5 MM |
8955 | /* The TMPL is a partial instantiation. To get a full set of |
8956 | arguments we must add the arguments used to perform the | |
8957 | partial instantiation. */ | |
8958 | targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl), | |
8959 | targ_ptr); | |
36a117a5 MM |
8960 | |
8961 | /* Check to see if we already have this specialization. */ | |
c7222c02 MM |
8962 | spec = retrieve_specialization (gen_tmpl, targ_ptr, |
8963 | /*class_specializations_p=*/false); | |
75650646 MM |
8964 | if (spec != NULL_TREE) |
8965 | return spec; | |
386b8a85 JM |
8966 | } |
8967 | ||
3e4a3562 NS |
8968 | if (check_instantiated_args (gen_tmpl, INNERMOST_TEMPLATE_ARGS (targ_ptr), |
8969 | complain)) | |
8970 | return error_mark_node; | |
8971 | ||
2b907f5c KL |
8972 | /* We are building a FUNCTION_DECL, during which the access of its |
8973 | parameters and return types have to be checked. However this | |
8974 | FUNCTION_DECL which is the desired context for access checking | |
8975 | is not built yet. We solve this chicken-and-egg problem by | |
8976 | deferring all checks until we have the FUNCTION_DECL. */ | |
8977 | push_deferring_access_checks (dk_deferred); | |
5c74d5b0 | 8978 | |
f4f206f4 | 8979 | /* Substitute template parameters. */ |
17aec3eb | 8980 | fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl), |
3e4a3562 | 8981 | targ_ptr, complain, gen_tmpl); |
5c74d5b0 | 8982 | |
2b907f5c KL |
8983 | /* Now we know the specialization, compute access previously |
8984 | deferred. */ | |
8985 | push_access_scope (fndecl); | |
8986 | perform_deferred_access_checks (); | |
8987 | pop_access_scope (fndecl); | |
8988 | pop_deferring_access_checks (); | |
5c74d5b0 | 8989 | |
36a117a5 MM |
8990 | /* The DECL_TI_TEMPLATE should always be the immediate parent |
8991 | template, not the most general template. */ | |
8992 | DECL_TI_TEMPLATE (fndecl) = tmpl; | |
8d08fdba | 8993 | |
94350948 | 8994 | /* If we've just instantiated the main entry point for a function, |
3ad97789 NS |
8995 | instantiate all the alternate entry points as well. We do this |
8996 | by cloning the instantiation of the main entry point, not by | |
8997 | instantiating the template clones. */ | |
8998 | if (TREE_CHAIN (gen_tmpl) && DECL_CLONED_FUNCTION_P (TREE_CHAIN (gen_tmpl))) | |
8999 | clone_function_decl (fndecl, /*update_method_vec_p=*/0); | |
94350948 | 9000 | |
5566b478 | 9001 | return fndecl; |
8d08fdba | 9002 | } |
5566b478 | 9003 | |
4393e105 MM |
9004 | /* The FN is a TEMPLATE_DECL for a function. The ARGS are the |
9005 | arguments that are being used when calling it. TARGS is a vector | |
9006 | into which the deduced template arguments are placed. | |
8d08fdba MS |
9007 | |
9008 | Return zero for success, 2 for an incomplete match that doesn't resolve | |
9009 | all the types, and 1 for complete failure. An error message will be | |
9010 | printed only for an incomplete match. | |
9011 | ||
e5214479 JM |
9012 | If FN is a conversion operator, or we are trying to produce a specific |
9013 | specialization, RETURN_TYPE is the return type desired. | |
9f54c803 MM |
9014 | |
9015 | The EXPLICIT_TARGS are explicit template arguments provided via a | |
9016 | template-id. | |
6467930b | 9017 | |
830bfa74 MM |
9018 | The parameter STRICT is one of: |
9019 | ||
9020 | DEDUCE_CALL: | |
9021 | We are deducing arguments for a function call, as in | |
9022 | [temp.deduct.call]. | |
9023 | ||
9024 | DEDUCE_CONV: | |
9025 | We are deducing arguments for a conversion function, as in | |
9026 | [temp.deduct.conv]. | |
9027 | ||
9028 | DEDUCE_EXACT: | |
62e4a758 NS |
9029 | We are deducing arguments when doing an explicit instantiation |
9030 | as in [temp.explicit], when determining an explicit specialization | |
9031 | as in [temp.expl.spec], or when taking the address of a function | |
9032 | template, as in [temp.deduct.funcaddr]. | |
9033 | ||
9034 | DEDUCE_ORDER: | |
830bfa74 MM |
9035 | We are deducing arguments when calculating the partial |
9036 | ordering between specializations of function or class | |
62e4a758 | 9037 | templates, as in [temp.func.order] and [temp.class.order]. |
4393e105 | 9038 | |
e5214479 JM |
9039 | LEN is the number of parms to consider before returning success, or -1 |
9040 | for all. This is used in partial ordering to avoid comparing parms for | |
9041 | which no actual argument was passed, since they are not considered in | |
9042 | overload resolution (and are explicitly excluded from consideration in | |
9043 | partial ordering in [temp.func.order]/6). */ | |
8d08fdba MS |
9044 | |
9045 | int | |
3a978d72 NN |
9046 | fn_type_unification (tree fn, |
9047 | tree explicit_targs, | |
9048 | tree targs, | |
9049 | tree args, | |
9050 | tree return_type, | |
9051 | unification_kind_t strict, | |
9052 | int len) | |
386b8a85 | 9053 | { |
4393e105 MM |
9054 | tree parms; |
9055 | tree fntype; | |
adecb3f4 | 9056 | int result; |
386b8a85 | 9057 | |
50bc768d | 9058 | gcc_assert (TREE_CODE (fn) == TEMPLATE_DECL); |
2b59fc25 | 9059 | |
4393e105 MM |
9060 | fntype = TREE_TYPE (fn); |
9061 | if (explicit_targs) | |
75650646 | 9062 | { |
4393e105 MM |
9063 | /* [temp.deduct] |
9064 | ||
9065 | The specified template arguments must match the template | |
9066 | parameters in kind (i.e., type, nontype, template), and there | |
9067 | must not be more arguments than there are parameters; | |
9068 | otherwise type deduction fails. | |
9069 | ||
9070 | Nontype arguments must match the types of the corresponding | |
9071 | nontype template parameters, or must be convertible to the | |
9072 | types of the corresponding nontype parameters as specified in | |
9073 | _temp.arg.nontype_, otherwise type deduction fails. | |
9074 | ||
9075 | All references in the function type of the function template | |
9076 | to the corresponding template parameters are replaced by the | |
9077 | specified template argument values. If a substitution in a | |
9078 | template parameter or in the function type of the function | |
9079 | template results in an invalid type, type deduction fails. */ | |
9080 | int i; | |
9081 | tree converted_args; | |
ffd49b19 | 9082 | bool incomplete; |
75650646 | 9083 | |
c8a7ed43 AO |
9084 | if (explicit_targs == error_mark_node) |
9085 | return 1; | |
9086 | ||
4393e105 MM |
9087 | converted_args |
9088 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn), | |
c2ea3a40 | 9089 | explicit_targs, NULL_TREE, tf_none, |
4393e105 MM |
9090 | /*require_all_arguments=*/0)); |
9091 | if (converted_args == error_mark_node) | |
75650646 | 9092 | return 1; |
386b8a85 | 9093 | |
ffd49b19 NS |
9094 | /* Substitute the explicit args into the function type. This is |
9095 | necessary so that, for instance, explicitly declared function | |
9096 | arguments can match null pointed constants. If we were given | |
9097 | an incomplete set of explicit args, we must not do semantic | |
9098 | processing during substitution as we could create partial | |
9099 | instantiations. */ | |
9100 | incomplete = NUM_TMPL_ARGS (explicit_targs) != NUM_TMPL_ARGS (targs); | |
9101 | processing_template_decl += incomplete; | |
c2ea3a40 | 9102 | fntype = tsubst (fntype, converted_args, tf_none, NULL_TREE); |
ffd49b19 NS |
9103 | processing_template_decl -= incomplete; |
9104 | ||
4393e105 MM |
9105 | if (fntype == error_mark_node) |
9106 | return 1; | |
050367a3 | 9107 | |
4393e105 | 9108 | /* Place the explicitly specified arguments in TARGS. */ |
ffd49b19 | 9109 | for (i = NUM_TMPL_ARGS (converted_args); i--;) |
4393e105 | 9110 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (converted_args, i); |
75650646 | 9111 | } |
4393e105 MM |
9112 | |
9113 | parms = TYPE_ARG_TYPES (fntype); | |
e5214479 JM |
9114 | /* Never do unification on the 'this' parameter. */ |
9115 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)) | |
9116 | parms = TREE_CHAIN (parms); | |
8d3631f8 NS |
9117 | |
9118 | if (return_type) | |
9119 | { | |
9120 | /* We've been given a return type to match, prepend it. */ | |
9121 | parms = tree_cons (NULL_TREE, TREE_TYPE (fntype), parms); | |
9122 | args = tree_cons (NULL_TREE, return_type, args); | |
16e42e7c JM |
9123 | if (len >= 0) |
9124 | ++len; | |
4393e105 MM |
9125 | } |
9126 | ||
4393e105 MM |
9127 | /* We allow incomplete unification without an error message here |
9128 | because the standard doesn't seem to explicitly prohibit it. Our | |
9129 | callers must be ready to deal with unification failures in any | |
9130 | event. */ | |
adecb3f4 MM |
9131 | result = type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn), |
9132 | targs, parms, args, /*subr=*/0, | |
e5214479 | 9133 | strict, /*allow_incomplete*/1, len); |
adecb3f4 MM |
9134 | |
9135 | if (result == 0) | |
9136 | /* All is well so far. Now, check: | |
9137 | ||
9138 | [temp.deduct] | |
9139 | ||
9140 | When all template arguments have been deduced, all uses of | |
9141 | template parameters in nondeduced contexts are replaced with | |
9142 | the corresponding deduced argument values. If the | |
9143 | substitution results in an invalid type, as described above, | |
9144 | type deduction fails. */ | |
c2ea3a40 | 9145 | if (tsubst (TREE_TYPE (fn), targs, tf_none, NULL_TREE) |
adecb3f4 MM |
9146 | == error_mark_node) |
9147 | return 1; | |
9148 | ||
9149 | return result; | |
830bfa74 MM |
9150 | } |
9151 | ||
9152 | /* Adjust types before performing type deduction, as described in | |
9153 | [temp.deduct.call] and [temp.deduct.conv]. The rules in these two | |
4c7d0dff MM |
9154 | sections are symmetric. PARM is the type of a function parameter |
9155 | or the return type of the conversion function. ARG is the type of | |
9156 | the argument passed to the call, or the type of the value | |
dc957d14 | 9157 | initialized with the result of the conversion function. */ |
386b8a85 | 9158 | |
62e4a758 | 9159 | static int |
3a978d72 NN |
9160 | maybe_adjust_types_for_deduction (unification_kind_t strict, |
9161 | tree* parm, | |
9162 | tree* arg) | |
830bfa74 | 9163 | { |
62e4a758 NS |
9164 | int result = 0; |
9165 | ||
830bfa74 MM |
9166 | switch (strict) |
9167 | { | |
9168 | case DEDUCE_CALL: | |
9169 | break; | |
9170 | ||
9171 | case DEDUCE_CONV: | |
9172 | { | |
4c7d0dff MM |
9173 | /* Swap PARM and ARG throughout the remainder of this |
9174 | function; the handling is precisely symmetric since PARM | |
9175 | will initialize ARG rather than vice versa. */ | |
830bfa74 MM |
9176 | tree* temp = parm; |
9177 | parm = arg; | |
9178 | arg = temp; | |
9179 | break; | |
9180 | } | |
9181 | ||
9182 | case DEDUCE_EXACT: | |
9183 | /* There is nothing to do in this case. */ | |
62e4a758 | 9184 | return 0; |
830bfa74 | 9185 | |
62e4a758 NS |
9186 | case DEDUCE_ORDER: |
9187 | /* DR 214. [temp.func.order] is underspecified, and leads to no | |
9188 | ordering between things like `T *' and `T const &' for `U *'. | |
9189 | The former has T=U and the latter T=U*. The former looks more | |
9190 | specialized and John Spicer considers it well-formed (the EDG | |
9191 | compiler accepts it). | |
9192 | ||
9193 | John also confirms that deduction should proceed as in a function | |
996065b4 | 9194 | call. Which implies the usual ARG and PARM conversions as DEDUCE_CALL. |
62e4a758 NS |
9195 | However, in ordering, ARG can have REFERENCE_TYPE, but no argument |
9196 | to an actual call can have such a type. | |
9197 | ||
996065b4 NS |
9198 | If both ARG and PARM are REFERENCE_TYPE, we change neither. |
9199 | If only ARG is a REFERENCE_TYPE, we look through that and then | |
9200 | proceed as with DEDUCE_CALL (which could further convert it). */ | |
62e4a758 NS |
9201 | if (TREE_CODE (*arg) == REFERENCE_TYPE) |
9202 | { | |
9203 | if (TREE_CODE (*parm) == REFERENCE_TYPE) | |
9204 | return 0; | |
9205 | *arg = TREE_TYPE (*arg); | |
62e4a758 NS |
9206 | } |
9207 | break; | |
830bfa74 | 9208 | default: |
315fb5db | 9209 | gcc_unreachable (); |
830bfa74 MM |
9210 | } |
9211 | ||
9212 | if (TREE_CODE (*parm) != REFERENCE_TYPE) | |
9213 | { | |
9214 | /* [temp.deduct.call] | |
9215 | ||
9216 | If P is not a reference type: | |
9217 | ||
9218 | --If A is an array type, the pointer type produced by the | |
9219 | array-to-pointer standard conversion (_conv.array_) is | |
9220 | used in place of A for type deduction; otherwise, | |
9221 | ||
9222 | --If A is a function type, the pointer type produced by | |
9223 | the function-to-pointer standard conversion | |
9224 | (_conv.func_) is used in place of A for type deduction; | |
9225 | otherwise, | |
9226 | ||
9227 | --If A is a cv-qualified type, the top level | |
9228 | cv-qualifiers of A's type are ignored for type | |
9229 | deduction. */ | |
9230 | if (TREE_CODE (*arg) == ARRAY_TYPE) | |
9231 | *arg = build_pointer_type (TREE_TYPE (*arg)); | |
d8f8dca1 | 9232 | else if (TREE_CODE (*arg) == FUNCTION_TYPE) |
830bfa74 MM |
9233 | *arg = build_pointer_type (*arg); |
9234 | else | |
9235 | *arg = TYPE_MAIN_VARIANT (*arg); | |
9236 | } | |
9237 | ||
9238 | /* [temp.deduct.call] | |
9239 | ||
9240 | If P is a cv-qualified type, the top level cv-qualifiers | |
9241 | of P's type are ignored for type deduction. If P is a | |
9242 | reference type, the type referred to by P is used for | |
9243 | type deduction. */ | |
9244 | *parm = TYPE_MAIN_VARIANT (*parm); | |
9245 | if (TREE_CODE (*parm) == REFERENCE_TYPE) | |
62e4a758 NS |
9246 | { |
9247 | *parm = TREE_TYPE (*parm); | |
9248 | result |= UNIFY_ALLOW_OUTER_MORE_CV_QUAL; | |
9249 | } | |
1c82cc90 NS |
9250 | |
9251 | /* DR 322. For conversion deduction, remove a reference type on parm | |
9252 | too (which has been swapped into ARG). */ | |
9253 | if (strict == DEDUCE_CONV && TREE_CODE (*arg) == REFERENCE_TYPE) | |
9254 | *arg = TREE_TYPE (*arg); | |
9255 | ||
62e4a758 | 9256 | return result; |
386b8a85 JM |
9257 | } |
9258 | ||
e5214479 | 9259 | /* Most parms like fn_type_unification. |
9f54c803 MM |
9260 | |
9261 | If SUBR is 1, we're being called recursively (to unify the | |
9262 | arguments of a function or method parameter of a function | |
9263 | template). */ | |
386b8a85 | 9264 | |
4966381a | 9265 | static int |
3a978d72 NN |
9266 | type_unification_real (tree tparms, |
9267 | tree targs, | |
9268 | tree xparms, | |
9269 | tree xargs, | |
9270 | int subr, | |
9271 | unification_kind_t strict, | |
9272 | int allow_incomplete, | |
9273 | int xlen) | |
8d08fdba MS |
9274 | { |
9275 | tree parm, arg; | |
9276 | int i; | |
9277 | int ntparms = TREE_VEC_LENGTH (tparms); | |
830bfa74 | 9278 | int sub_strict; |
bd0d5d4a JM |
9279 | int saw_undeduced = 0; |
9280 | tree parms, args; | |
9281 | int len; | |
8d08fdba | 9282 | |
50bc768d NS |
9283 | gcc_assert (TREE_CODE (tparms) == TREE_VEC); |
9284 | gcc_assert (xparms == NULL_TREE || TREE_CODE (xparms) == TREE_LIST); | |
9285 | gcc_assert (!xargs || TREE_CODE (xargs) == TREE_LIST); | |
9286 | gcc_assert (ntparms > 0); | |
8d08fdba | 9287 | |
830bfa74 MM |
9288 | switch (strict) |
9289 | { | |
9290 | case DEDUCE_CALL: | |
028d1f20 NS |
9291 | sub_strict = (UNIFY_ALLOW_OUTER_LEVEL | UNIFY_ALLOW_MORE_CV_QUAL |
9292 | | UNIFY_ALLOW_DERIVED); | |
830bfa74 MM |
9293 | break; |
9294 | ||
9295 | case DEDUCE_CONV: | |
9296 | sub_strict = UNIFY_ALLOW_LESS_CV_QUAL; | |
9297 | break; | |
9298 | ||
9299 | case DEDUCE_EXACT: | |
9300 | sub_strict = UNIFY_ALLOW_NONE; | |
9301 | break; | |
62e4a758 NS |
9302 | |
9303 | case DEDUCE_ORDER: | |
9304 | sub_strict = UNIFY_ALLOW_NONE; | |
9305 | break; | |
830bfa74 MM |
9306 | |
9307 | default: | |
315fb5db | 9308 | gcc_unreachable (); |
830bfa74 MM |
9309 | } |
9310 | ||
bd0d5d4a | 9311 | if (xlen == 0) |
e5214479 JM |
9312 | return 0; |
9313 | ||
bd0d5d4a JM |
9314 | again: |
9315 | parms = xparms; | |
9316 | args = xargs; | |
9317 | len = xlen; | |
9318 | ||
8d08fdba MS |
9319 | while (parms |
9320 | && parms != void_list_node | |
9321 | && args | |
9322 | && args != void_list_node) | |
9323 | { | |
9324 | parm = TREE_VALUE (parms); | |
9325 | parms = TREE_CHAIN (parms); | |
9326 | arg = TREE_VALUE (args); | |
9327 | args = TREE_CHAIN (args); | |
9328 | ||
9329 | if (arg == error_mark_node) | |
9330 | return 1; | |
9331 | if (arg == unknown_type_node) | |
34016c81 JM |
9332 | /* We can't deduce anything from this, but we might get all the |
9333 | template args from other function args. */ | |
9334 | continue; | |
b7484fbe | 9335 | |
03e70705 JM |
9336 | /* Conversions will be performed on a function argument that |
9337 | corresponds with a function parameter that contains only | |
9338 | non-deducible template parameters and explicitly specified | |
9339 | template parameters. */ | |
c353b8e3 | 9340 | if (!uses_template_parms (parm)) |
b7484fbe | 9341 | { |
03e70705 JM |
9342 | tree type; |
9343 | ||
2f939d94 | 9344 | if (!TYPE_P (arg)) |
03e70705 JM |
9345 | type = TREE_TYPE (arg); |
9346 | else | |
c353b8e3 | 9347 | type = arg; |
03e70705 | 9348 | |
62e4a758 | 9349 | if (strict == DEDUCE_EXACT || strict == DEDUCE_ORDER) |
03e70705 | 9350 | { |
3bfdc719 | 9351 | if (same_type_p (parm, type)) |
03e70705 JM |
9352 | continue; |
9353 | } | |
03e70705 | 9354 | else |
343c89cd JM |
9355 | /* It might work; we shouldn't check now, because we might |
9356 | get into infinite recursion. Overload resolution will | |
9357 | handle it. */ | |
9358 | continue; | |
03e70705 | 9359 | |
b7484fbe MS |
9360 | return 1; |
9361 | } | |
9362 | ||
2f939d94 | 9363 | if (!TYPE_P (arg)) |
8d08fdba | 9364 | { |
50bc768d | 9365 | gcc_assert (TREE_TYPE (arg) != NULL_TREE); |
34016c81 | 9366 | if (type_unknown_p (arg)) |
28cbf42c | 9367 | { |
34016c81 JM |
9368 | /* [temp.deduct.type] A template-argument can be deduced from |
9369 | a pointer to function or pointer to member function | |
9370 | argument if the set of overloaded functions does not | |
9371 | contain function templates and at most one of a set of | |
9372 | overloaded functions provides a unique match. */ | |
9373 | ||
9374 | if (resolve_overloaded_unification | |
4393e105 | 9375 | (tparms, targs, parm, arg, strict, sub_strict) |
34016c81 JM |
9376 | != 0) |
9377 | return 1; | |
9378 | continue; | |
28cbf42c | 9379 | } |
8d08fdba | 9380 | arg = TREE_TYPE (arg); |
08476342 NS |
9381 | if (arg == error_mark_node) |
9382 | return 1; | |
8d08fdba | 9383 | } |
62e4a758 NS |
9384 | |
9385 | { | |
9386 | int arg_strict = sub_strict; | |
9387 | ||
9388 | if (!subr) | |
9389 | arg_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
4393e105 | 9390 | |
62e4a758 NS |
9391 | if (unify (tparms, targs, parm, arg, arg_strict)) |
9392 | return 1; | |
9393 | } | |
e5214479 JM |
9394 | |
9395 | /* Are we done with the interesting parms? */ | |
9396 | if (--len == 0) | |
bd0d5d4a | 9397 | goto done; |
8d08fdba MS |
9398 | } |
9399 | /* Fail if we've reached the end of the parm list, and more args | |
9400 | are present, and the parm list isn't variadic. */ | |
9401 | if (args && args != void_list_node && parms == void_list_node) | |
9402 | return 1; | |
f4f206f4 | 9403 | /* Fail if parms are left and they don't have default values. */ |
8d08fdba MS |
9404 | if (parms |
9405 | && parms != void_list_node | |
9406 | && TREE_PURPOSE (parms) == NULL_TREE) | |
9407 | return 1; | |
bd0d5d4a JM |
9408 | |
9409 | done: | |
8d08fdba MS |
9410 | if (!subr) |
9411 | for (i = 0; i < ntparms; i++) | |
050367a3 | 9412 | if (TREE_VEC_ELT (targs, i) == NULL_TREE) |
8d08fdba | 9413 | { |
bd0d5d4a JM |
9414 | tree tparm = TREE_VALUE (TREE_VEC_ELT (tparms, i)); |
9415 | ||
9416 | /* If this is an undeduced nontype parameter that depends on | |
9417 | a type parameter, try another pass; its type may have been | |
9418 | deduced from a later argument than the one from which | |
9419 | this parameter can be deduced. */ | |
9420 | if (TREE_CODE (tparm) == PARM_DECL | |
9421 | && uses_template_parms (TREE_TYPE (tparm)) | |
9422 | && !saw_undeduced++) | |
9423 | goto again; | |
9424 | ||
386b8a85 | 9425 | if (!allow_incomplete) |
8251199e | 9426 | error ("incomplete type unification"); |
8d08fdba MS |
9427 | return 2; |
9428 | } | |
9429 | return 0; | |
9430 | } | |
9431 | ||
34016c81 JM |
9432 | /* Subroutine of type_unification_real. Args are like the variables at the |
9433 | call site. ARG is an overloaded function (or template-id); we try | |
9434 | deducing template args from each of the overloads, and if only one | |
9435 | succeeds, we go with that. Modifies TARGS and returns 0 on success. */ | |
9436 | ||
9437 | static int | |
3a978d72 NN |
9438 | resolve_overloaded_unification (tree tparms, |
9439 | tree targs, | |
9440 | tree parm, | |
9441 | tree arg, | |
9442 | unification_kind_t strict, | |
9443 | int sub_strict) | |
34016c81 JM |
9444 | { |
9445 | tree tempargs = copy_node (targs); | |
9446 | int good = 0; | |
f23fb7f5 | 9447 | bool addr_p; |
34016c81 JM |
9448 | |
9449 | if (TREE_CODE (arg) == ADDR_EXPR) | |
f23fb7f5 MM |
9450 | { |
9451 | arg = TREE_OPERAND (arg, 0); | |
9452 | addr_p = true; | |
9453 | } | |
9454 | else | |
9455 | addr_p = false; | |
9f3d9e46 | 9456 | |
d8f8dca1 MM |
9457 | if (TREE_CODE (arg) == COMPONENT_REF) |
9458 | /* Handle `&x' where `x' is some static or non-static member | |
9459 | function name. */ | |
9460 | arg = TREE_OPERAND (arg, 1); | |
9461 | ||
05e0b2f4 JM |
9462 | if (TREE_CODE (arg) == OFFSET_REF) |
9463 | arg = TREE_OPERAND (arg, 1); | |
9464 | ||
9f3d9e46 | 9465 | /* Strip baselink information. */ |
50ad9642 MM |
9466 | if (BASELINK_P (arg)) |
9467 | arg = BASELINK_FUNCTIONS (arg); | |
9f3d9e46 | 9468 | |
34016c81 JM |
9469 | if (TREE_CODE (arg) == TEMPLATE_ID_EXPR) |
9470 | { | |
9471 | /* If we got some explicit template args, we need to plug them into | |
9472 | the affected templates before we try to unify, in case the | |
9473 | explicit args will completely resolve the templates in question. */ | |
9474 | ||
9475 | tree expl_subargs = TREE_OPERAND (arg, 1); | |
9476 | arg = TREE_OPERAND (arg, 0); | |
9477 | ||
9478 | for (; arg; arg = OVL_NEXT (arg)) | |
9479 | { | |
9480 | tree fn = OVL_CURRENT (arg); | |
9481 | tree subargs, elem; | |
9482 | ||
9483 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
9484 | continue; | |
9485 | ||
17aec3eb RK |
9486 | subargs = get_bindings_overload (fn, DECL_TEMPLATE_RESULT (fn), |
9487 | expl_subargs); | |
34016c81 JM |
9488 | if (subargs) |
9489 | { | |
c2ea3a40 | 9490 | elem = tsubst (TREE_TYPE (fn), subargs, tf_none, NULL_TREE); |
f23fb7f5 MM |
9491 | good += try_one_overload (tparms, targs, tempargs, parm, |
9492 | elem, strict, sub_strict, addr_p); | |
34016c81 JM |
9493 | } |
9494 | } | |
9495 | } | |
315fb5db | 9496 | else |
34016c81 | 9497 | { |
315fb5db NS |
9498 | gcc_assert (TREE_CODE (arg) == OVERLOAD |
9499 | || TREE_CODE (arg) == FUNCTION_DECL); | |
9500 | ||
34016c81 | 9501 | for (; arg; arg = OVL_NEXT (arg)) |
f23fb7f5 MM |
9502 | good += try_one_overload (tparms, targs, tempargs, parm, |
9503 | TREE_TYPE (OVL_CURRENT (arg)), | |
9504 | strict, sub_strict, addr_p); | |
34016c81 | 9505 | } |
34016c81 JM |
9506 | |
9507 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
9508 | to function or pointer to member function argument if the set of | |
9509 | overloaded functions does not contain function templates and at most | |
9510 | one of a set of overloaded functions provides a unique match. | |
9511 | ||
9512 | So if we found multiple possibilities, we return success but don't | |
9513 | deduce anything. */ | |
9514 | ||
9515 | if (good == 1) | |
9516 | { | |
9517 | int i = TREE_VEC_LENGTH (targs); | |
9518 | for (; i--; ) | |
9519 | if (TREE_VEC_ELT (tempargs, i)) | |
9520 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i); | |
9521 | } | |
9522 | if (good) | |
9523 | return 0; | |
9524 | ||
9525 | return 1; | |
9526 | } | |
9527 | ||
9528 | /* Subroutine of resolve_overloaded_unification; does deduction for a single | |
9529 | overload. Fills TARGS with any deduced arguments, or error_mark_node if | |
9530 | different overloads deduce different arguments for a given parm. | |
f23fb7f5 MM |
9531 | ADDR_P is true if the expression for which deduction is being |
9532 | performed was of the form "& fn" rather than simply "fn". | |
9533 | ||
34016c81 JM |
9534 | Returns 1 on success. */ |
9535 | ||
9536 | static int | |
3a978d72 NN |
9537 | try_one_overload (tree tparms, |
9538 | tree orig_targs, | |
9539 | tree targs, | |
9540 | tree parm, | |
9541 | tree arg, | |
9542 | unification_kind_t strict, | |
f23fb7f5 MM |
9543 | int sub_strict, |
9544 | bool addr_p) | |
34016c81 JM |
9545 | { |
9546 | int nargs; | |
9547 | tree tempargs; | |
9548 | int i; | |
9549 | ||
9550 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
9551 | to function or pointer to member function argument if the set of | |
9552 | overloaded functions does not contain function templates and at most | |
9553 | one of a set of overloaded functions provides a unique match. | |
9554 | ||
9555 | So if this is a template, just return success. */ | |
9556 | ||
9557 | if (uses_template_parms (arg)) | |
9558 | return 1; | |
9559 | ||
f23fb7f5 MM |
9560 | if (TREE_CODE (arg) == METHOD_TYPE) |
9561 | arg = build_ptrmemfunc_type (build_pointer_type (arg)); | |
9562 | else if (addr_p) | |
9563 | arg = build_pointer_type (arg); | |
9564 | ||
62e4a758 | 9565 | sub_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg); |
34016c81 JM |
9566 | |
9567 | /* We don't copy orig_targs for this because if we have already deduced | |
9568 | some template args from previous args, unify would complain when we | |
9569 | try to deduce a template parameter for the same argument, even though | |
9570 | there isn't really a conflict. */ | |
9571 | nargs = TREE_VEC_LENGTH (targs); | |
f31c0a32 | 9572 | tempargs = make_tree_vec (nargs); |
34016c81 | 9573 | |
4393e105 | 9574 | if (unify (tparms, tempargs, parm, arg, sub_strict) != 0) |
34016c81 JM |
9575 | return 0; |
9576 | ||
9577 | /* First make sure we didn't deduce anything that conflicts with | |
e97e5263 | 9578 | explicitly specified args. */ |
34016c81 JM |
9579 | for (i = nargs; i--; ) |
9580 | { | |
9581 | tree elt = TREE_VEC_ELT (tempargs, i); | |
e97e5263 | 9582 | tree oldelt = TREE_VEC_ELT (orig_targs, i); |
34016c81 JM |
9583 | |
9584 | if (elt == NULL_TREE) | |
9585 | continue; | |
9586 | else if (uses_template_parms (elt)) | |
9587 | { | |
9588 | /* Since we're unifying against ourselves, we will fill in template | |
9589 | args used in the function parm list with our own template parms. | |
9590 | Discard them. */ | |
9591 | TREE_VEC_ELT (tempargs, i) = NULL_TREE; | |
9592 | continue; | |
9593 | } | |
9594 | else if (oldelt && ! template_args_equal (oldelt, elt)) | |
9595 | return 0; | |
9596 | } | |
9597 | ||
9598 | for (i = nargs; i--; ) | |
9599 | { | |
9600 | tree elt = TREE_VEC_ELT (tempargs, i); | |
9601 | ||
9602 | if (elt) | |
9603 | TREE_VEC_ELT (targs, i) = elt; | |
9604 | } | |
9605 | ||
9606 | return 1; | |
9607 | } | |
9608 | ||
74601d7c KL |
9609 | /* Verify that nondeduce template argument agrees with the type |
9610 | obtained from argument deduction. Return nonzero if the | |
9611 | verification fails. | |
9612 | ||
9613 | For example: | |
9614 | ||
9615 | struct A { typedef int X; }; | |
9616 | template <class T, class U> struct C {}; | |
9617 | template <class T> struct C<T, typename T::X> {}; | |
9618 | ||
9619 | Then with the instantiation `C<A, int>', we can deduce that | |
9620 | `T' is `A' but unify () does not check whether `typename T::X' | |
9621 | is `int'. This function ensure that they agree. | |
9622 | ||
9623 | TARGS, PARMS are the same as the arguments of unify. | |
9624 | ARGS contains template arguments from all levels. */ | |
9625 | ||
9626 | static int | |
3a978d72 | 9627 | verify_class_unification (tree targs, tree parms, tree args) |
74601d7c | 9628 | { |
e2005c8d KL |
9629 | parms = tsubst (parms, add_outermost_template_args (args, targs), |
9630 | tf_none, NULL_TREE); | |
9631 | if (parms == error_mark_node) | |
74601d7c KL |
9632 | return 1; |
9633 | ||
e2005c8d | 9634 | return !comp_template_args (parms, INNERMOST_TEMPLATE_ARGS (args)); |
74601d7c KL |
9635 | } |
9636 | ||
4393e105 MM |
9637 | /* PARM is a template class (perhaps with unbound template |
9638 | parameters). ARG is a fully instantiated type. If ARG can be | |
9639 | bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and | |
9640 | TARGS are as for unify. */ | |
fcfb9f96 MM |
9641 | |
9642 | static tree | |
3a978d72 | 9643 | try_class_unification (tree tparms, tree targs, tree parm, tree arg) |
4393e105 | 9644 | { |
4393e105 MM |
9645 | tree copy_of_targs; |
9646 | ||
9647 | if (!CLASSTYPE_TEMPLATE_INFO (arg) | |
68361a03 MM |
9648 | || (most_general_template (CLASSTYPE_TI_TEMPLATE (arg)) |
9649 | != most_general_template (CLASSTYPE_TI_TEMPLATE (parm)))) | |
4393e105 MM |
9650 | return NULL_TREE; |
9651 | ||
9652 | /* We need to make a new template argument vector for the call to | |
9653 | unify. If we used TARGS, we'd clutter it up with the result of | |
9654 | the attempted unification, even if this class didn't work out. | |
9655 | We also don't want to commit ourselves to all the unifications | |
9656 | we've already done, since unification is supposed to be done on | |
9657 | an argument-by-argument basis. In other words, consider the | |
9658 | following pathological case: | |
9659 | ||
9660 | template <int I, int J, int K> | |
9661 | struct S {}; | |
9662 | ||
9663 | template <int I, int J> | |
9664 | struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {}; | |
9665 | ||
9666 | template <int I, int J, int K> | |
9667 | void f(S<I, J, K>, S<I, I, I>); | |
9668 | ||
9669 | void g() { | |
9670 | S<0, 0, 0> s0; | |
9671 | S<0, 1, 2> s2; | |
9672 | ||
9673 | f(s0, s2); | |
9674 | } | |
9675 | ||
9676 | Now, by the time we consider the unification involving `s2', we | |
9677 | already know that we must have `f<0, 0, 0>'. But, even though | |
0e339752 | 9678 | `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is invalid |
4393e105 MM |
9679 | because there are two ways to unify base classes of S<0, 1, 2> |
9680 | with S<I, I, I>. If we kept the already deduced knowledge, we | |
9681 | would reject the possibility I=1. */ | |
f31c0a32 | 9682 | copy_of_targs = make_tree_vec (TREE_VEC_LENGTH (targs)); |
4393e105 MM |
9683 | |
9684 | /* If unification failed, we're done. */ | |
74601d7c KL |
9685 | if (unify (tparms, copy_of_targs, CLASSTYPE_TI_ARGS (parm), |
9686 | CLASSTYPE_TI_ARGS (arg), UNIFY_ALLOW_NONE)) | |
4393e105 | 9687 | return NULL_TREE; |
74601d7c KL |
9688 | |
9689 | return arg; | |
4393e105 MM |
9690 | } |
9691 | ||
a3a0fc7f NS |
9692 | /* Given a template type PARM and a class type ARG, find the unique |
9693 | base type in ARG that is an instance of PARM. We do not examine | |
9694 | ARG itself; only its base-classes. If there is not exactly one | |
9695 | appropriate base class, return NULL_TREE. PARM may be the type of | |
9696 | a partial specialization, as well as a plain template type. Used | |
9697 | by unify. */ | |
4393e105 MM |
9698 | |
9699 | static tree | |
a3a0fc7f | 9700 | get_template_base (tree tparms, tree targs, tree parm, tree arg) |
fcfb9f96 | 9701 | { |
a3a0fc7f NS |
9702 | tree rval = NULL_TREE; |
9703 | tree binfo; | |
9704 | ||
9705 | gcc_assert (IS_AGGR_TYPE_CODE (TREE_CODE (arg))); | |
9706 | ||
9707 | binfo = TYPE_BINFO (complete_type (arg)); | |
9708 | if (!binfo) | |
9709 | /* The type could not be completed. */ | |
9710 | return NULL_TREE; | |
fcfb9f96 | 9711 | |
a3a0fc7f NS |
9712 | /* Walk in inheritance graph order. The search order is not |
9713 | important, and this avoids multiple walks of virtual bases. */ | |
9714 | for (binfo = TREE_CHAIN (binfo); binfo; binfo = TREE_CHAIN (binfo)) | |
fcfb9f96 | 9715 | { |
a3a0fc7f | 9716 | tree r = try_class_unification (tparms, targs, parm, BINFO_TYPE (binfo)); |
fcfb9f96 | 9717 | |
8d83768f NS |
9718 | if (r) |
9719 | { | |
9720 | /* If there is more than one satisfactory baseclass, then: | |
fcfb9f96 | 9721 | |
8d83768f | 9722 | [temp.deduct.call] |
fcfb9f96 | 9723 | |
8d83768f NS |
9724 | If they yield more than one possible deduced A, the type |
9725 | deduction fails. | |
4393e105 | 9726 | |
8d83768f | 9727 | applies. */ |
a3a0fc7f NS |
9728 | if (rval && !same_type_p (r, rval)) |
9729 | return NULL_TREE; | |
8d83768f | 9730 | |
a3a0fc7f | 9731 | rval = r; |
8d83768f | 9732 | } |
fcfb9f96 MM |
9733 | } |
9734 | ||
a3a0fc7f | 9735 | return rval; |
fcfb9f96 MM |
9736 | } |
9737 | ||
db2767b6 MM |
9738 | /* Returns the level of DECL, which declares a template parameter. */ |
9739 | ||
e9659ab0 | 9740 | static int |
3a978d72 | 9741 | template_decl_level (tree decl) |
db2767b6 MM |
9742 | { |
9743 | switch (TREE_CODE (decl)) | |
9744 | { | |
9745 | case TYPE_DECL: | |
9746 | case TEMPLATE_DECL: | |
9747 | return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl)); | |
9748 | ||
9749 | case PARM_DECL: | |
9750 | return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl)); | |
9751 | ||
9752 | default: | |
315fb5db | 9753 | gcc_unreachable (); |
db2767b6 | 9754 | } |
315fb5db | 9755 | return 0; |
db2767b6 MM |
9756 | } |
9757 | ||
830bfa74 MM |
9758 | /* Decide whether ARG can be unified with PARM, considering only the |
9759 | cv-qualifiers of each type, given STRICT as documented for unify. | |
324f9dfb | 9760 | Returns nonzero iff the unification is OK on that basis. */ |
e92cc029 | 9761 | |
e9659ab0 | 9762 | static int |
3a978d72 | 9763 | check_cv_quals_for_unify (int strict, tree arg, tree parm) |
830bfa74 | 9764 | { |
4f2b0fb2 NS |
9765 | int arg_quals = cp_type_quals (arg); |
9766 | int parm_quals = cp_type_quals (parm); | |
9767 | ||
355f774d NS |
9768 | if (TREE_CODE (parm) == TEMPLATE_TYPE_PARM |
9769 | && !(strict & UNIFY_ALLOW_OUTER_MORE_CV_QUAL)) | |
4f2b0fb2 | 9770 | { |
2e9ceb77 NS |
9771 | /* Although a CVR qualifier is ignored when being applied to a |
9772 | substituted template parameter ([8.3.2]/1 for example), that | |
9773 | does not apply during deduction [14.8.2.4]/1, (even though | |
9774 | that is not explicitly mentioned, [14.8.2.4]/9 indicates | |
355f774d NS |
9775 | this). Except when we're allowing additional CV qualifiers |
9776 | at the outer level [14.8.2.1]/3,1st bullet. */ | |
2e9ceb77 NS |
9777 | if ((TREE_CODE (arg) == REFERENCE_TYPE |
9778 | || TREE_CODE (arg) == FUNCTION_TYPE | |
9779 | || TREE_CODE (arg) == METHOD_TYPE) | |
9780 | && (parm_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE))) | |
9781 | return 0; | |
9782 | ||
9783 | if ((!POINTER_TYPE_P (arg) && TREE_CODE (arg) != TEMPLATE_TYPE_PARM) | |
9784 | && (parm_quals & TYPE_QUAL_RESTRICT)) | |
9785 | return 0; | |
4f2b0fb2 | 9786 | } |
2e9ceb77 | 9787 | |
62e4a758 | 9788 | if (!(strict & (UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_OUTER_MORE_CV_QUAL)) |
4f2b0fb2 | 9789 | && (arg_quals & parm_quals) != parm_quals) |
ef637255 MM |
9790 | return 0; |
9791 | ||
62e4a758 | 9792 | if (!(strict & (UNIFY_ALLOW_LESS_CV_QUAL | UNIFY_ALLOW_OUTER_LESS_CV_QUAL)) |
4f2b0fb2 | 9793 | && (parm_quals & arg_quals) != arg_quals) |
ef637255 MM |
9794 | return 0; |
9795 | ||
ef637255 | 9796 | return 1; |
830bfa74 MM |
9797 | } |
9798 | ||
9799 | /* Takes parameters as for type_unification. Returns 0 if the | |
dc957d14 | 9800 | type deduction succeeds, 1 otherwise. The parameter STRICT is a |
830bfa74 MM |
9801 | bitwise or of the following flags: |
9802 | ||
9803 | UNIFY_ALLOW_NONE: | |
9804 | Require an exact match between PARM and ARG. | |
9805 | UNIFY_ALLOW_MORE_CV_QUAL: | |
028d1f20 NS |
9806 | Allow the deduced ARG to be more cv-qualified (by qualification |
9807 | conversion) than ARG. | |
830bfa74 MM |
9808 | UNIFY_ALLOW_LESS_CV_QUAL: |
9809 | Allow the deduced ARG to be less cv-qualified than ARG. | |
9810 | UNIFY_ALLOW_DERIVED: | |
9811 | Allow the deduced ARG to be a template base class of ARG, | |
9812 | or a pointer to a template base class of the type pointed to by | |
161c12b0 JM |
9813 | ARG. |
9814 | UNIFY_ALLOW_INTEGER: | |
9815 | Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX | |
028d1f20 NS |
9816 | case for more information. |
9817 | UNIFY_ALLOW_OUTER_LEVEL: | |
9818 | This is the outermost level of a deduction. Used to determine validity | |
9819 | of qualification conversions. A valid qualification conversion must | |
9820 | have const qualified pointers leading up to the inner type which | |
9821 | requires additional CV quals, except at the outer level, where const | |
9822 | is not required [conv.qual]. It would be normal to set this flag in | |
62e4a758 NS |
9823 | addition to setting UNIFY_ALLOW_MORE_CV_QUAL. |
9824 | UNIFY_ALLOW_OUTER_MORE_CV_QUAL: | |
9825 | This is the outermost level of a deduction, and PARM can be more CV | |
9826 | qualified at this point. | |
9827 | UNIFY_ALLOW_OUTER_LESS_CV_QUAL: | |
9828 | This is the outermost level of a deduction, and PARM can be less CV | |
8baddbf1 | 9829 | qualified at this point. */ |
830bfa74 | 9830 | |
e9659ab0 | 9831 | static int |
3a978d72 | 9832 | unify (tree tparms, tree targs, tree parm, tree arg, int strict) |
8d08fdba MS |
9833 | { |
9834 | int idx; | |
050367a3 | 9835 | tree targ; |
db2767b6 | 9836 | tree tparm; |
028d1f20 | 9837 | int strict_in = strict; |
8d08fdba MS |
9838 | |
9839 | /* I don't think this will do the right thing with respect to types. | |
9840 | But the only case I've seen it in so far has been array bounds, where | |
9841 | signedness is the only information lost, and I think that will be | |
9842 | okay. */ | |
9843 | while (TREE_CODE (parm) == NOP_EXPR) | |
9844 | parm = TREE_OPERAND (parm, 0); | |
9845 | ||
9846 | if (arg == error_mark_node) | |
9847 | return 1; | |
9848 | if (arg == unknown_type_node) | |
34016c81 JM |
9849 | /* We can't deduce anything from this, but we might get all the |
9850 | template args from other function args. */ | |
9851 | return 0; | |
9852 | ||
db2767b6 | 9853 | /* If PARM uses template parameters, then we can't bail out here, |
6bdb985f | 9854 | even if ARG == PARM, since we won't record unifications for the |
db2767b6 MM |
9855 | template parameters. We might need them if we're trying to |
9856 | figure out which of two things is more specialized. */ | |
9857 | if (arg == parm && !uses_template_parms (parm)) | |
8d08fdba MS |
9858 | return 0; |
9859 | ||
830bfa74 MM |
9860 | /* Immediately reject some pairs that won't unify because of |
9861 | cv-qualification mismatches. */ | |
9862 | if (TREE_CODE (arg) == TREE_CODE (parm) | |
2f939d94 | 9863 | && TYPE_P (arg) |
d0ab7624 NS |
9864 | /* It is the elements of the array which hold the cv quals of an array |
9865 | type, and the elements might be template type parms. We'll check | |
9866 | when we recurse. */ | |
9867 | && TREE_CODE (arg) != ARRAY_TYPE | |
830bfa74 MM |
9868 | /* We check the cv-qualifiers when unifying with template type |
9869 | parameters below. We want to allow ARG `const T' to unify with | |
9870 | PARM `T' for example, when computing which of two templates | |
9871 | is more specialized, for example. */ | |
9872 | && TREE_CODE (arg) != TEMPLATE_TYPE_PARM | |
028d1f20 | 9873 | && !check_cv_quals_for_unify (strict_in, arg, parm)) |
49432171 JM |
9874 | return 1; |
9875 | ||
028d1f20 | 9876 | if (!(strict & UNIFY_ALLOW_OUTER_LEVEL) |
3ea099f1 | 9877 | && TYPE_P (parm) && !CP_TYPE_CONST_P (parm)) |
028d1f20 NS |
9878 | strict &= ~UNIFY_ALLOW_MORE_CV_QUAL; |
9879 | strict &= ~UNIFY_ALLOW_OUTER_LEVEL; | |
9880 | strict &= ~UNIFY_ALLOW_DERIVED; | |
62e4a758 NS |
9881 | strict &= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL; |
9882 | strict &= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL; | |
028d1f20 | 9883 | |
8d08fdba MS |
9884 | switch (TREE_CODE (parm)) |
9885 | { | |
2ca340ae | 9886 | case TYPENAME_TYPE: |
fccef71e | 9887 | case SCOPE_REF: |
b8c6534b | 9888 | case UNBOUND_CLASS_TEMPLATE: |
2ca340ae JM |
9889 | /* In a type which contains a nested-name-specifier, template |
9890 | argument values cannot be deduced for template parameters used | |
9891 | within the nested-name-specifier. */ | |
9892 | return 0; | |
9893 | ||
8d08fdba | 9894 | case TEMPLATE_TYPE_PARM: |
73b0fce8 | 9895 | case TEMPLATE_TEMPLATE_PARM: |
a1281f45 | 9896 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
db2767b6 MM |
9897 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
9898 | ||
9899 | if (TEMPLATE_TYPE_LEVEL (parm) | |
9900 | != template_decl_level (tparm)) | |
9901 | /* The PARM is not one we're trying to unify. Just check | |
9902 | to see if it matches ARG. */ | |
9903 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
3bfdc719 | 9904 | && same_type_p (parm, arg)) ? 0 : 1; |
73b0fce8 | 9905 | idx = TEMPLATE_TYPE_IDX (parm); |
050367a3 | 9906 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 9907 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx)); |
050367a3 | 9908 | |
73b0fce8 | 9909 | /* Check for mixed types and values. */ |
db2767b6 MM |
9910 | if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM |
9911 | && TREE_CODE (tparm) != TYPE_DECL) | |
9912 | || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
9913 | && TREE_CODE (tparm) != TEMPLATE_DECL)) | |
73b0fce8 KL |
9914 | return 1; |
9915 | ||
a1281f45 | 9916 | if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM) |
73b0fce8 | 9917 | { |
b429fdf0 KL |
9918 | /* ARG must be constructed from a template class or a template |
9919 | template parameter. */ | |
9920 | if (TREE_CODE (arg) != BOUND_TEMPLATE_TEMPLATE_PARM | |
9921 | && (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg))) | |
a1281f45 | 9922 | return 1; |
73b0fce8 | 9923 | |
a1281f45 KL |
9924 | { |
9925 | tree parmtmpl = TYPE_TI_TEMPLATE (parm); | |
9926 | tree parmvec = TYPE_TI_ARGS (parm); | |
6df91b00 | 9927 | tree argvec = INNERMOST_TEMPLATE_ARGS (TYPE_TI_ARGS (arg)); |
a1281f45 | 9928 | tree argtmplvec |
b429fdf0 | 9929 | = DECL_INNERMOST_TEMPLATE_PARMS (TYPE_TI_TEMPLATE (arg)); |
a1281f45 | 9930 | int i; |
73b0fce8 | 9931 | |
a1281f45 KL |
9932 | /* The parameter and argument roles have to be switched here |
9933 | in order to handle default arguments properly. For example, | |
9934 | template<template <class> class TT> void f(TT<int>) | |
9935 | should be able to accept vector<int> which comes from | |
9936 | template <class T, class Allocator = allocator> | |
9937 | class vector. */ | |
9938 | ||
ee3071ef NS |
9939 | if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 0, 1) |
9940 | == error_mark_node) | |
a1281f45 | 9941 | return 1; |
73b0fce8 | 9942 | |
a1281f45 KL |
9943 | /* Deduce arguments T, i from TT<T> or TT<i>. |
9944 | We check each element of PARMVEC and ARGVEC individually | |
9945 | rather than the whole TREE_VEC since they can have | |
9946 | different number of elements. */ | |
6b9b6b15 | 9947 | |
a1281f45 KL |
9948 | for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i) |
9949 | { | |
6df91b00 KL |
9950 | if (unify (tparms, targs, |
9951 | TREE_VEC_ELT (parmvec, i), | |
a1281f45 KL |
9952 | TREE_VEC_ELT (argvec, i), |
9953 | UNIFY_ALLOW_NONE)) | |
9954 | return 1; | |
73b0fce8 | 9955 | } |
a1281f45 | 9956 | } |
b429fdf0 | 9957 | arg = TYPE_TI_TEMPLATE (arg); |
a1281f45 KL |
9958 | |
9959 | /* Fall through to deduce template name. */ | |
9960 | } | |
9961 | ||
9962 | if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
9963 | || TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
9964 | { | |
9965 | /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */ | |
9966 | ||
9967 | /* Simple cases: Value already set, does match or doesn't. */ | |
9968 | if (targ != NULL_TREE && template_args_equal (targ, arg)) | |
9969 | return 0; | |
9970 | else if (targ) | |
9971 | return 1; | |
db2767b6 MM |
9972 | } |
9973 | else | |
9974 | { | |
830bfa74 MM |
9975 | /* If PARM is `const T' and ARG is only `int', we don't have |
9976 | a match unless we are allowing additional qualification. | |
9977 | If ARG is `const int' and PARM is just `T' that's OK; | |
9978 | that binds `const int' to `T'. */ | |
028d1f20 | 9979 | if (!check_cv_quals_for_unify (strict_in | UNIFY_ALLOW_LESS_CV_QUAL, |
830bfa74 | 9980 | arg, parm)) |
db2767b6 MM |
9981 | return 1; |
9982 | ||
830bfa74 MM |
9983 | /* Consider the case where ARG is `const volatile int' and |
9984 | PARM is `const T'. Then, T should be `volatile int'. */ | |
c2ea3a40 NS |
9985 | arg = cp_build_qualified_type_real |
9986 | (arg, cp_type_quals (arg) & ~cp_type_quals (parm), tf_none); | |
adecb3f4 MM |
9987 | if (arg == error_mark_node) |
9988 | return 1; | |
73b0fce8 | 9989 | |
a1281f45 KL |
9990 | /* Simple cases: Value already set, does match or doesn't. */ |
9991 | if (targ != NULL_TREE && same_type_p (targ, arg)) | |
9992 | return 0; | |
9993 | else if (targ) | |
9994 | return 1; | |
61cd552e | 9995 | |
94fc547c MM |
9996 | /* Make sure that ARG is not a variable-sized array. (Note |
9997 | that were talking about variable-sized arrays (like | |
9998 | `int[n]'), rather than arrays of unknown size (like | |
9999 | `int[]').) We'll get very confused by such a type since | |
10000 | the bound of the array will not be computable in an | |
10001 | instantiation. Besides, such types are not allowed in | |
10002 | ISO C++, so we can do as we please here. */ | |
5377d5ba | 10003 | if (variably_modified_type_p (arg, NULL_TREE)) |
94fc547c MM |
10004 | return 1; |
10005 | } | |
61cd552e | 10006 | |
050367a3 | 10007 | TREE_VEC_ELT (targs, idx) = arg; |
73b0fce8 KL |
10008 | return 0; |
10009 | ||
f84b4be9 | 10010 | case TEMPLATE_PARM_INDEX: |
db2767b6 MM |
10011 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
10012 | ||
10013 | if (TEMPLATE_PARM_LEVEL (parm) | |
10014 | != template_decl_level (tparm)) | |
10015 | /* The PARM is not one we're trying to unify. Just check | |
10016 | to see if it matches ARG. */ | |
c8a209ca NS |
10017 | return !(TREE_CODE (arg) == TREE_CODE (parm) |
10018 | && cp_tree_equal (parm, arg)); | |
db2767b6 | 10019 | |
f84b4be9 | 10020 | idx = TEMPLATE_PARM_IDX (parm); |
050367a3 | 10021 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 10022 | |
050367a3 | 10023 | if (targ) |
c8a209ca | 10024 | return !cp_tree_equal (targ, arg); |
8d08fdba | 10025 | |
161c12b0 JM |
10026 | /* [temp.deduct.type] If, in the declaration of a function template |
10027 | with a non-type template-parameter, the non-type | |
10028 | template-parameter is used in an expression in the function | |
10029 | parameter-list and, if the corresponding template-argument is | |
10030 | deduced, the template-argument type shall match the type of the | |
10031 | template-parameter exactly, except that a template-argument | |
d7c4edd0 NS |
10032 | deduced from an array bound may be of any integral type. |
10033 | The non-type parameter might use already deduced type parameters. */ | |
bd0d5d4a | 10034 | tparm = tsubst (TREE_TYPE (parm), targs, 0, NULL_TREE); |
e2005c8d KL |
10035 | if (!TREE_TYPE (arg)) |
10036 | /* Template-parameter dependent expression. Just accept it for now. | |
10037 | It will later be processed in convert_template_argument. */ | |
10038 | ; | |
10039 | else if (same_type_p (TREE_TYPE (arg), tparm)) | |
10040 | /* OK */; | |
161c12b0 | 10041 | else if ((strict & UNIFY_ALLOW_INTEGER) |
bd0d5d4a JM |
10042 | && (TREE_CODE (tparm) == INTEGER_TYPE |
10043 | || TREE_CODE (tparm) == BOOLEAN_TYPE)) | |
8baddbf1 MM |
10044 | /* Convert the ARG to the type of PARM; the deduced non-type |
10045 | template argument must exactly match the types of the | |
10046 | corresponding parameter. */ | |
10047 | arg = fold (build_nop (TREE_TYPE (parm), arg)); | |
bd0d5d4a JM |
10048 | else if (uses_template_parms (tparm)) |
10049 | /* We haven't deduced the type of this parameter yet. Try again | |
10050 | later. */ | |
10051 | return 0; | |
161c12b0 JM |
10052 | else |
10053 | return 1; | |
10054 | ||
2a1e9fdd | 10055 | TREE_VEC_ELT (targs, idx) = arg; |
8d08fdba MS |
10056 | return 0; |
10057 | ||
28e8f3a0 GB |
10058 | case PTRMEM_CST: |
10059 | { | |
10060 | /* A pointer-to-member constant can be unified only with | |
10061 | another constant. */ | |
10062 | if (TREE_CODE (arg) != PTRMEM_CST) | |
10063 | return 1; | |
10064 | ||
10065 | /* Just unify the class member. It would be useless (and possibly | |
10066 | wrong, depending on the strict flags) to unify also | |
10067 | PTRMEM_CST_CLASS, because we want to be sure that both parm and | |
10068 | arg refer to the same variable, even if through different | |
10069 | classes. For instance: | |
10070 | ||
10071 | struct A { int x; }; | |
10072 | struct B : A { }; | |
10073 | ||
10074 | Unification of &A::x and &B::x must succeed. */ | |
10075 | return unify (tparms, targs, PTRMEM_CST_MEMBER (parm), | |
10076 | PTRMEM_CST_MEMBER (arg), strict); | |
10077 | } | |
10078 | ||
8d08fdba | 10079 | case POINTER_TYPE: |
830bfa74 | 10080 | { |
830bfa74 MM |
10081 | if (TREE_CODE (arg) != POINTER_TYPE) |
10082 | return 1; | |
10083 | ||
10084 | /* [temp.deduct.call] | |
10085 | ||
10086 | A can be another pointer or pointer to member type that can | |
10087 | be converted to the deduced A via a qualification | |
10088 | conversion (_conv.qual_). | |
10089 | ||
10090 | We pass down STRICT here rather than UNIFY_ALLOW_NONE. | |
10091 | This will allow for additional cv-qualification of the | |
028d1f20 | 10092 | pointed-to types if appropriate. */ |
830bfa74 | 10093 | |
028d1f20 | 10094 | if (TREE_CODE (TREE_TYPE (arg)) == RECORD_TYPE) |
830bfa74 MM |
10095 | /* The derived-to-base conversion only persists through one |
10096 | level of pointers. */ | |
028d1f20 | 10097 | strict |= (strict_in & UNIFY_ALLOW_DERIVED); |
830bfa74 | 10098 | |
a7a64a77 | 10099 | return unify (tparms, targs, TREE_TYPE (parm), |
028d1f20 | 10100 | TREE_TYPE (arg), strict); |
830bfa74 | 10101 | } |
8d08fdba MS |
10102 | |
10103 | case REFERENCE_TYPE: | |
830bfa74 MM |
10104 | if (TREE_CODE (arg) != REFERENCE_TYPE) |
10105 | return 1; | |
10106 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), | |
028d1f20 | 10107 | strict & UNIFY_ALLOW_MORE_CV_QUAL); |
8d08fdba MS |
10108 | |
10109 | case ARRAY_TYPE: | |
10110 | if (TREE_CODE (arg) != ARRAY_TYPE) | |
10111 | return 1; | |
3042d5be MM |
10112 | if ((TYPE_DOMAIN (parm) == NULL_TREE) |
10113 | != (TYPE_DOMAIN (arg) == NULL_TREE)) | |
10114 | return 1; | |
8baddbf1 MM |
10115 | if (TYPE_DOMAIN (parm) != NULL_TREE) |
10116 | { | |
10117 | tree parm_max; | |
10118 | tree arg_max; | |
10119 | ||
10120 | parm_max = TYPE_MAX_VALUE (TYPE_DOMAIN (parm)); | |
10121 | arg_max = TYPE_MAX_VALUE (TYPE_DOMAIN (arg)); | |
10122 | ||
10123 | /* Our representation of array types uses "N - 1" as the | |
10124 | TYPE_MAX_VALUE for an array with "N" elements, if "N" is | |
10125 | not an integer constant. */ | |
10126 | if (TREE_CODE (parm_max) == MINUS_EXPR) | |
10127 | { | |
10128 | arg_max = fold (build2 (PLUS_EXPR, | |
10129 | integer_type_node, | |
10130 | arg_max, | |
10131 | TREE_OPERAND (parm_max, 1))); | |
10132 | parm_max = TREE_OPERAND (parm_max, 0); | |
10133 | } | |
10134 | ||
10135 | if (unify (tparms, targs, parm_max, arg_max, UNIFY_ALLOW_INTEGER)) | |
10136 | return 1; | |
10137 | } | |
830bfa74 | 10138 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
712467a4 | 10139 | strict & UNIFY_ALLOW_MORE_CV_QUAL); |
8d08fdba MS |
10140 | |
10141 | case REAL_TYPE: | |
37c46b43 | 10142 | case COMPLEX_TYPE: |
c00996a3 | 10143 | case VECTOR_TYPE: |
8d08fdba | 10144 | case INTEGER_TYPE: |
42976354 | 10145 | case BOOLEAN_TYPE: |
3590f0a6 | 10146 | case ENUMERAL_TYPE: |
5ad5a526 | 10147 | case VOID_TYPE: |
f376e137 MS |
10148 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
10149 | return 1; | |
8baddbf1 | 10150 | |
9edc3913 | 10151 | /* We have already checked cv-qualification at the top of the |
514a1f18 | 10152 | function. */ |
8baddbf1 | 10153 | if (!same_type_ignoring_top_level_qualifiers_p (arg, parm)) |
ca79f85d JM |
10154 | return 1; |
10155 | ||
8d08fdba MS |
10156 | /* As far as unification is concerned, this wins. Later checks |
10157 | will invalidate it if necessary. */ | |
10158 | return 0; | |
10159 | ||
10160 | /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */ | |
bd6dd845 | 10161 | /* Type INTEGER_CST can come from ordinary constant template args. */ |
8d08fdba | 10162 | case INTEGER_CST: |
bd6dd845 MS |
10163 | while (TREE_CODE (arg) == NOP_EXPR) |
10164 | arg = TREE_OPERAND (arg, 0); | |
10165 | ||
8d08fdba MS |
10166 | if (TREE_CODE (arg) != INTEGER_CST) |
10167 | return 1; | |
10168 | return !tree_int_cst_equal (parm, arg); | |
10169 | ||
8d08fdba MS |
10170 | case TREE_VEC: |
10171 | { | |
10172 | int i; | |
10173 | if (TREE_CODE (arg) != TREE_VEC) | |
10174 | return 1; | |
10175 | if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg)) | |
10176 | return 1; | |
0dc09a61 | 10177 | for (i = 0; i < TREE_VEC_LENGTH (parm); ++i) |
830bfa74 | 10178 | if (unify (tparms, targs, |
8d08fdba | 10179 | TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i), |
4393e105 | 10180 | UNIFY_ALLOW_NONE)) |
8d08fdba MS |
10181 | return 1; |
10182 | return 0; | |
10183 | } | |
10184 | ||
8d08fdba | 10185 | case RECORD_TYPE: |
f181d4ae | 10186 | case UNION_TYPE: |
f181d4ae | 10187 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
a4443a08 | 10188 | return 1; |
830bfa74 | 10189 | |
a7a64a77 MM |
10190 | if (TYPE_PTRMEMFUNC_P (parm)) |
10191 | { | |
10192 | if (!TYPE_PTRMEMFUNC_P (arg)) | |
10193 | return 1; | |
10194 | ||
10195 | return unify (tparms, targs, | |
10196 | TYPE_PTRMEMFUNC_FN_TYPE (parm), | |
10197 | TYPE_PTRMEMFUNC_FN_TYPE (arg), | |
10198 | strict); | |
10199 | } | |
10200 | ||
5db698f6 | 10201 | if (CLASSTYPE_TEMPLATE_INFO (parm)) |
5566b478 | 10202 | { |
6467930b | 10203 | tree t = NULL_TREE; |
4393e105 | 10204 | |
028d1f20 | 10205 | if (strict_in & UNIFY_ALLOW_DERIVED) |
4393e105 MM |
10206 | { |
10207 | /* First, we try to unify the PARM and ARG directly. */ | |
10208 | t = try_class_unification (tparms, targs, | |
10209 | parm, arg); | |
10210 | ||
10211 | if (!t) | |
10212 | { | |
10213 | /* Fallback to the special case allowed in | |
10214 | [temp.deduct.call]: | |
10215 | ||
10216 | If P is a class, and P has the form | |
10217 | template-id, then A can be a derived class of | |
10218 | the deduced A. Likewise, if P is a pointer to | |
10219 | a class of the form template-id, A can be a | |
10220 | pointer to a derived class pointed to by the | |
10221 | deduced A. */ | |
8d83768f | 10222 | t = get_template_base (tparms, targs, parm, arg); |
4393e105 | 10223 | |
8d83768f | 10224 | if (!t) |
4393e105 MM |
10225 | return 1; |
10226 | } | |
10227 | } | |
6df47b06 | 10228 | else if (CLASSTYPE_TEMPLATE_INFO (arg) |
9fbf56f7 MM |
10229 | && (CLASSTYPE_TI_TEMPLATE (parm) |
10230 | == CLASSTYPE_TI_TEMPLATE (arg))) | |
6df47b06 MM |
10231 | /* Perhaps PARM is something like S<U> and ARG is S<int>. |
10232 | Then, we should unify `int' and `U'. */ | |
6467930b | 10233 | t = arg; |
4393e105 | 10234 | else |
dc957d14 | 10235 | /* There's no chance of unification succeeding. */ |
5566b478 | 10236 | return 1; |
6467930b | 10237 | |
830bfa74 | 10238 | return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm), |
4393e105 | 10239 | CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE); |
5566b478 | 10240 | } |
9edc3913 | 10241 | else if (!same_type_ignoring_top_level_qualifiers_p (parm, arg)) |
5566b478 | 10242 | return 1; |
a4443a08 | 10243 | return 0; |
8d08fdba MS |
10244 | |
10245 | case METHOD_TYPE: | |
8d08fdba | 10246 | case FUNCTION_TYPE: |
830bfa74 | 10247 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8d08fdba | 10248 | return 1; |
830bfa74 MM |
10249 | |
10250 | if (unify (tparms, targs, TREE_TYPE (parm), | |
4393e105 | 10251 | TREE_TYPE (arg), UNIFY_ALLOW_NONE)) |
28cbf42c | 10252 | return 1; |
386b8a85 | 10253 | return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm), |
3b3ba9f0 | 10254 | TYPE_ARG_TYPES (arg), 1, |
e5214479 | 10255 | DEDUCE_EXACT, 0, -1); |
a4443a08 MS |
10256 | |
10257 | case OFFSET_TYPE: | |
10258 | if (TREE_CODE (arg) != OFFSET_TYPE) | |
10259 | return 1; | |
830bfa74 | 10260 | if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm), |
4393e105 | 10261 | TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE)) |
a4443a08 | 10262 | return 1; |
830bfa74 | 10263 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
4393e105 | 10264 | strict); |
a4443a08 | 10265 | |
f62dbf03 | 10266 | case CONST_DECL: |
a723baf1 MM |
10267 | if (DECL_TEMPLATE_PARM_P (parm)) |
10268 | return unify (tparms, targs, DECL_INITIAL (parm), arg, strict); | |
8a784e4a | 10269 | if (arg != integral_constant_value (parm)) |
f62dbf03 JM |
10270 | return 1; |
10271 | return 0; | |
10272 | ||
28e8f3a0 | 10273 | case FIELD_DECL: |
027905b4 KL |
10274 | case TEMPLATE_DECL: |
10275 | /* Matched cases are handled by the ARG == PARM test above. */ | |
10276 | return 1; | |
10277 | ||
8d08fdba | 10278 | default: |
6615c446 | 10279 | gcc_assert (EXPR_P (parm)); |
98ddffc1 NS |
10280 | |
10281 | /* We must be looking at an expression. This can happen with | |
10282 | something like: | |
4393e105 | 10283 | |
98ddffc1 NS |
10284 | template <int I> |
10285 | void foo(S<I>, S<I + 2>); | |
050367a3 | 10286 | |
98ddffc1 | 10287 | This is a "nondeduced context": |
050367a3 | 10288 | |
98ddffc1 | 10289 | [deduct.type] |
4393e105 | 10290 | |
98ddffc1 | 10291 | The nondeduced contexts are: |
050367a3 | 10292 | |
98ddffc1 NS |
10293 | --A type that is a template-id in which one or more of |
10294 | the template-arguments is an expression that references | |
10295 | a template-parameter. | |
050367a3 | 10296 | |
98ddffc1 NS |
10297 | In these cases, we assume deduction succeeded, but don't |
10298 | actually infer any unifications. */ | |
74601d7c | 10299 | |
98ddffc1 NS |
10300 | if (!uses_template_parms (parm) |
10301 | && !template_args_equal (parm, arg)) | |
10302 | return 1; | |
10303 | else | |
10304 | return 0; | |
8d08fdba MS |
10305 | } |
10306 | } | |
8d08fdba | 10307 | \f |
4684cd27 MM |
10308 | /* Note that DECL can be defined in this translation unit, if |
10309 | required. */ | |
10310 | ||
10311 | static void | |
10312 | mark_definable (tree decl) | |
10313 | { | |
10314 | tree clone; | |
10315 | DECL_NOT_REALLY_EXTERN (decl) = 1; | |
10316 | FOR_EACH_CLONE (clone, decl) | |
10317 | DECL_NOT_REALLY_EXTERN (clone) = 1; | |
10318 | } | |
10319 | ||
03d0f4af | 10320 | /* Called if RESULT is explicitly instantiated, or is a member of an |
4684cd27 | 10321 | explicitly instantiated class. */ |
03d0f4af | 10322 | |
faae18ab | 10323 | void |
3a978d72 | 10324 | mark_decl_instantiated (tree result, int extern_p) |
faae18ab | 10325 | { |
415c974c | 10326 | SET_DECL_EXPLICIT_INSTANTIATION (result); |
3ae18eaf | 10327 | |
1f6f0cb6 MM |
10328 | /* If this entity has already been written out, it's too late to |
10329 | make any modifications. */ | |
10330 | if (TREE_ASM_WRITTEN (result)) | |
10331 | return; | |
10332 | ||
10333 | if (TREE_CODE (result) != FUNCTION_DECL) | |
10334 | /* The TREE_PUBLIC flag for function declarations will have been | |
10335 | set correctly by tsubst. */ | |
10336 | TREE_PUBLIC (result) = 1; | |
10337 | ||
346eeb15 JM |
10338 | /* This might have been set by an earlier implicit instantiation. */ |
10339 | DECL_COMDAT (result) = 0; | |
10340 | ||
4684cd27 MM |
10341 | if (extern_p) |
10342 | DECL_NOT_REALLY_EXTERN (result) = 0; | |
10343 | else | |
faae18ab | 10344 | { |
4684cd27 | 10345 | mark_definable (result); |
1a408d07 JM |
10346 | /* Always make artificials weak. */ |
10347 | if (DECL_ARTIFICIAL (result) && flag_weak) | |
10348 | comdat_linkage (result); | |
a7d87521 JM |
10349 | /* For WIN32 we also want to put explicit instantiations in |
10350 | linkonce sections. */ | |
1a408d07 | 10351 | else if (TREE_PUBLIC (result)) |
b385c841 | 10352 | maybe_make_one_only (result); |
faae18ab | 10353 | } |
4684cd27 MM |
10354 | |
10355 | /* If EXTERN_P, then this function will not be emitted -- unless | |
10356 | followed by an explicit instantiation, at which point its linkage | |
10357 | will be adjusted. If !EXTERN_P, then this function will be | |
10358 | emitted here. In neither circumstance do we want | |
10359 | import_export_decl to adjust the linkage. */ | |
10360 | DECL_INTERFACE_KNOWN (result) = 1; | |
faae18ab MS |
10361 | } |
10362 | ||
e5214479 | 10363 | /* Given two function templates PAT1 and PAT2, return: |
6467930b | 10364 | |
62e4a758 NS |
10365 | DEDUCE should be DEDUCE_EXACT or DEDUCE_ORDER. |
10366 | ||
6467930b MS |
10367 | 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order]. |
10368 | -1 if PAT2 is more specialized than PAT1. | |
e5214479 JM |
10369 | 0 if neither is more specialized. |
10370 | ||
10371 | LEN is passed through to fn_type_unification. */ | |
6467930b MS |
10372 | |
10373 | int | |
3a978d72 | 10374 | more_specialized (tree pat1, tree pat2, int deduce, int len) |
6467930b | 10375 | { |
98c1c668 | 10376 | tree targs; |
73aad9b9 | 10377 | int winner = 0; |
6467930b | 10378 | |
35c18a20 MM |
10379 | /* If template argument deduction succeeds, we substitute the |
10380 | resulting arguments into non-deduced contexts. While doing that, | |
10381 | we must be aware that we may encounter dependent types. */ | |
10382 | ++processing_template_decl; | |
62e4a758 NS |
10383 | targs = get_bindings_real (pat1, DECL_TEMPLATE_RESULT (pat2), |
10384 | NULL_TREE, 0, deduce, len); | |
73aad9b9 | 10385 | if (targs) |
36a117a5 | 10386 | --winner; |
6467930b | 10387 | |
62e4a758 NS |
10388 | targs = get_bindings_real (pat2, DECL_TEMPLATE_RESULT (pat1), |
10389 | NULL_TREE, 0, deduce, len); | |
73aad9b9 | 10390 | if (targs) |
36a117a5 | 10391 | ++winner; |
35c18a20 | 10392 | --processing_template_decl; |
6467930b | 10393 | |
73aad9b9 JM |
10394 | return winner; |
10395 | } | |
6467930b | 10396 | |
73aad9b9 | 10397 | /* Given two class template specialization list nodes PAT1 and PAT2, return: |
6467930b | 10398 | |
73aad9b9 JM |
10399 | 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order]. |
10400 | -1 if PAT2 is more specialized than PAT1. | |
55ece1b3 KL |
10401 | 0 if neither is more specialized. |
10402 | ||
10403 | FULL_ARGS is the full set of template arguments that triggers this | |
10404 | partial ordering. */ | |
73aad9b9 JM |
10405 | |
10406 | int | |
55ece1b3 | 10407 | more_specialized_class (tree pat1, tree pat2, tree full_args) |
73aad9b9 JM |
10408 | { |
10409 | tree targs; | |
10410 | int winner = 0; | |
10411 | ||
baa49730 GB |
10412 | /* Just like what happens for functions, if we are ordering between |
10413 | different class template specializations, we may encounter dependent | |
10414 | types in the arguments, and we need our dependency check functions | |
10415 | to behave correctly. */ | |
10416 | ++processing_template_decl; | |
36a117a5 | 10417 | targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1), |
55ece1b3 | 10418 | add_outermost_template_args (full_args, TREE_PURPOSE (pat2))); |
73aad9b9 JM |
10419 | if (targs) |
10420 | --winner; | |
10421 | ||
36a117a5 | 10422 | targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2), |
55ece1b3 | 10423 | add_outermost_template_args (full_args, TREE_PURPOSE (pat1))); |
73aad9b9 | 10424 | if (targs) |
6467930b | 10425 | ++winner; |
baa49730 | 10426 | --processing_template_decl; |
6467930b MS |
10427 | |
10428 | return winner; | |
10429 | } | |
73aad9b9 JM |
10430 | |
10431 | /* Return the template arguments that will produce the function signature | |
e1467ff2 | 10432 | DECL from the function template FN, with the explicit template |
76b9a14d | 10433 | arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must |
4393e105 | 10434 | also match. Return NULL_TREE if no satisfactory arguments could be |
62e4a758 | 10435 | found. DEDUCE and LEN are passed through to fn_type_unification. */ |
e5214479 | 10436 | |
76b9a14d | 10437 | static tree |
3a978d72 NN |
10438 | get_bindings_real (tree fn, |
10439 | tree decl, | |
10440 | tree explicit_args, | |
10441 | int check_rettype, | |
10442 | int deduce, | |
10443 | int len) | |
73aad9b9 | 10444 | { |
98c1c668 | 10445 | int ntparms = DECL_NTPARMS (fn); |
f31c0a32 | 10446 | tree targs = make_tree_vec (ntparms); |
4393e105 | 10447 | tree decl_type; |
03017874 | 10448 | tree decl_arg_types; |
98c1c668 JM |
10449 | int i; |
10450 | ||
4393e105 MM |
10451 | /* Substitute the explicit template arguments into the type of DECL. |
10452 | The call to fn_type_unification will handle substitution into the | |
10453 | FN. */ | |
10454 | decl_type = TREE_TYPE (decl); | |
10455 | if (explicit_args && uses_template_parms (decl_type)) | |
10456 | { | |
10457 | tree tmpl; | |
10458 | tree converted_args; | |
10459 | ||
10460 | if (DECL_TEMPLATE_INFO (decl)) | |
10461 | tmpl = DECL_TI_TEMPLATE (decl); | |
10462 | else | |
0e339752 | 10463 | /* We can get here for some invalid specializations. */ |
4393e105 MM |
10464 | return NULL_TREE; |
10465 | ||
10466 | converted_args | |
10467 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
10468 | explicit_args, NULL_TREE, | |
c2ea3a40 | 10469 | tf_none, /*require_all_arguments=*/0)); |
4393e105 MM |
10470 | if (converted_args == error_mark_node) |
10471 | return NULL_TREE; | |
10472 | ||
c2ea3a40 | 10473 | decl_type = tsubst (decl_type, converted_args, tf_none, NULL_TREE); |
4393e105 MM |
10474 | if (decl_type == error_mark_node) |
10475 | return NULL_TREE; | |
10476 | } | |
10477 | ||
10478 | decl_arg_types = TYPE_ARG_TYPES (decl_type); | |
e5214479 JM |
10479 | /* Never do unification on the 'this' parameter. */ |
10480 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
03017874 | 10481 | decl_arg_types = TREE_CHAIN (decl_arg_types); |
d7684f2d | 10482 | |
e1467ff2 | 10483 | i = fn_type_unification (fn, explicit_args, targs, |
03017874 | 10484 | decl_arg_types, |
8d3631f8 NS |
10485 | (check_rettype || DECL_CONV_FN_P (fn) |
10486 | ? TREE_TYPE (decl_type) : NULL_TREE), | |
62e4a758 | 10487 | deduce, len); |
98c1c668 | 10488 | |
76b9a14d JM |
10489 | if (i != 0) |
10490 | return NULL_TREE; | |
10491 | ||
76b9a14d JM |
10492 | return targs; |
10493 | } | |
10494 | ||
10495 | /* For most uses, we want to check the return type. */ | |
10496 | ||
eb1dfbb2 | 10497 | static tree |
3a978d72 | 10498 | get_bindings (tree fn, tree decl, tree explicit_args) |
76b9a14d | 10499 | { |
62e4a758 | 10500 | return get_bindings_real (fn, decl, explicit_args, 1, DEDUCE_EXACT, -1); |
76b9a14d JM |
10501 | } |
10502 | ||
e5214479 JM |
10503 | /* But for resolve_overloaded_unification, we only care about the parameter |
10504 | types. */ | |
76b9a14d JM |
10505 | |
10506 | static tree | |
3a978d72 | 10507 | get_bindings_overload (tree fn, tree decl, tree explicit_args) |
76b9a14d | 10508 | { |
62e4a758 | 10509 | return get_bindings_real (fn, decl, explicit_args, 0, DEDUCE_EXACT, -1); |
73aad9b9 JM |
10510 | } |
10511 | ||
36a117a5 MM |
10512 | /* Return the innermost template arguments that, when applied to a |
10513 | template specialization whose innermost template parameters are | |
9471d3e2 | 10514 | TPARMS, and whose specialization arguments are PARMS, yield the |
36a117a5 MM |
10515 | ARGS. |
10516 | ||
10517 | For example, suppose we have: | |
10518 | ||
10519 | template <class T, class U> struct S {}; | |
10520 | template <class T> struct S<T*, int> {}; | |
10521 | ||
10522 | Then, suppose we want to get `S<double*, int>'. The TPARMS will be | |
10523 | {T}, the PARMS will be {T*, int} and the ARGS will be {double*, | |
10524 | int}. The resulting vector will be {double}, indicating that `T' | |
10525 | is bound to `double'. */ | |
10526 | ||
bd6dd845 | 10527 | static tree |
3a978d72 | 10528 | get_class_bindings (tree tparms, tree parms, tree args) |
73aad9b9 | 10529 | { |
3b3ba9f0 | 10530 | int i, ntparms = TREE_VEC_LENGTH (tparms); |
f31c0a32 | 10531 | tree vec = make_tree_vec (ntparms); |
73aad9b9 | 10532 | |
74601d7c KL |
10533 | if (unify (tparms, vec, parms, INNERMOST_TEMPLATE_ARGS (args), |
10534 | UNIFY_ALLOW_NONE)) | |
fcfb9f96 | 10535 | return NULL_TREE; |
73aad9b9 JM |
10536 | |
10537 | for (i = 0; i < ntparms; ++i) | |
10538 | if (! TREE_VEC_ELT (vec, i)) | |
10539 | return NULL_TREE; | |
10540 | ||
74601d7c KL |
10541 | if (verify_class_unification (vec, parms, args)) |
10542 | return NULL_TREE; | |
10543 | ||
73aad9b9 JM |
10544 | return vec; |
10545 | } | |
10546 | ||
104bf76a MM |
10547 | /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs. |
10548 | Pick the most specialized template, and return the corresponding | |
10549 | instantiation, or if there is no corresponding instantiation, the | |
e5214479 JM |
10550 | template itself. If there is no most specialized template, |
10551 | error_mark_node is returned. If there are no templates at all, | |
10552 | NULL_TREE is returned. */ | |
73aad9b9 JM |
10553 | |
10554 | tree | |
3a978d72 | 10555 | most_specialized_instantiation (tree instantiations) |
73aad9b9 | 10556 | { |
104bf76a | 10557 | tree fn, champ; |
73aad9b9 JM |
10558 | int fate; |
10559 | ||
104bf76a | 10560 | if (!instantiations) |
73aad9b9 JM |
10561 | return NULL_TREE; |
10562 | ||
104bf76a MM |
10563 | champ = instantiations; |
10564 | for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn)) | |
73aad9b9 | 10565 | { |
62e4a758 NS |
10566 | fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn), |
10567 | DEDUCE_EXACT, -1); | |
73aad9b9 JM |
10568 | if (fate == 1) |
10569 | ; | |
10570 | else | |
10571 | { | |
10572 | if (fate == 0) | |
10573 | { | |
10574 | fn = TREE_CHAIN (fn); | |
10575 | if (! fn) | |
10576 | return error_mark_node; | |
10577 | } | |
104bf76a | 10578 | champ = fn; |
73aad9b9 JM |
10579 | } |
10580 | } | |
10581 | ||
104bf76a | 10582 | for (fn = instantiations; fn && fn != champ; fn = TREE_CHAIN (fn)) |
73aad9b9 | 10583 | { |
62e4a758 NS |
10584 | fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn), |
10585 | DEDUCE_EXACT, -1); | |
73aad9b9 JM |
10586 | if (fate != 1) |
10587 | return error_mark_node; | |
10588 | } | |
10589 | ||
104bf76a MM |
10590 | return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ); |
10591 | } | |
10592 | ||
10593 | /* Return the most specialized of the list of templates in FNS that can | |
10594 | produce an instantiation matching DECL, given the explicit template | |
10595 | arguments EXPLICIT_ARGS. */ | |
10596 | ||
e9659ab0 | 10597 | static tree |
3a978d72 | 10598 | most_specialized (tree fns, tree decl, tree explicit_args) |
104bf76a MM |
10599 | { |
10600 | tree candidates = NULL_TREE; | |
10601 | tree fn, args; | |
10602 | ||
10603 | for (fn = fns; fn; fn = TREE_CHAIN (fn)) | |
10604 | { | |
10605 | tree candidate = TREE_VALUE (fn); | |
10606 | ||
10607 | args = get_bindings (candidate, decl, explicit_args); | |
10608 | if (args) | |
e1b3e07d | 10609 | candidates = tree_cons (NULL_TREE, candidate, candidates); |
104bf76a MM |
10610 | } |
10611 | ||
e5214479 | 10612 | return most_specialized_instantiation (candidates); |
73aad9b9 JM |
10613 | } |
10614 | ||
36a117a5 | 10615 | /* If DECL is a specialization of some template, return the most |
f9a7ae04 MM |
10616 | general such template. Otherwise, returns NULL_TREE. |
10617 | ||
10618 | For example, given: | |
36a117a5 MM |
10619 | |
10620 | template <class T> struct S { template <class U> void f(U); }; | |
10621 | ||
10622 | if TMPL is `template <class U> void S<int>::f(U)' this will return | |
10623 | the full template. This function will not trace past partial | |
10624 | specializations, however. For example, given in addition: | |
10625 | ||
10626 | template <class T> struct S<T*> { template <class U> void f(U); }; | |
10627 | ||
10628 | if TMPL is `template <class U> void S<int*>::f(U)' this will return | |
10629 | `template <class T> template <class U> S<T*>::f(U)'. */ | |
73aad9b9 | 10630 | |
612c671a | 10631 | tree |
3a978d72 | 10632 | most_general_template (tree decl) |
73aad9b9 | 10633 | { |
f9a7ae04 MM |
10634 | /* If DECL is a FUNCTION_DECL, find the TEMPLATE_DECL of which it is |
10635 | an immediate specialization. */ | |
10636 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
10637 | { | |
10638 | if (DECL_TEMPLATE_INFO (decl)) { | |
10639 | decl = DECL_TI_TEMPLATE (decl); | |
10640 | ||
10641 | /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE for a | |
10642 | template friend. */ | |
10643 | if (TREE_CODE (decl) != TEMPLATE_DECL) | |
10644 | return NULL_TREE; | |
10645 | } else | |
10646 | return NULL_TREE; | |
10647 | } | |
10648 | ||
10649 | /* Look for more and more general templates. */ | |
10650 | while (DECL_TEMPLATE_INFO (decl)) | |
10651 | { | |
10b1d5e7 MM |
10652 | /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE in some cases. |
10653 | (See cp-tree.h for details.) */ | |
f9a7ae04 MM |
10654 | if (TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) |
10655 | break; | |
10656 | ||
6e049fcd KL |
10657 | if (CLASS_TYPE_P (TREE_TYPE (decl)) |
10658 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl))) | |
10659 | break; | |
10660 | ||
f9a7ae04 MM |
10661 | /* Stop if we run into an explicitly specialized class template. */ |
10662 | if (!DECL_NAMESPACE_SCOPE_P (decl) | |
10663 | && DECL_CONTEXT (decl) | |
10664 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl))) | |
10665 | break; | |
10666 | ||
10667 | decl = DECL_TI_TEMPLATE (decl); | |
10668 | } | |
36a117a5 MM |
10669 | |
10670 | return decl; | |
10671 | } | |
10672 | ||
10673 | /* Return the most specialized of the class template specializations | |
10674 | of TMPL which can produce an instantiation matching ARGS, or | |
10675 | error_mark_node if the choice is ambiguous. */ | |
10676 | ||
e9659ab0 | 10677 | static tree |
3a978d72 | 10678 | most_specialized_class (tree tmpl, tree args) |
36a117a5 MM |
10679 | { |
10680 | tree list = NULL_TREE; | |
10681 | tree t; | |
10682 | tree champ; | |
73aad9b9 JM |
10683 | int fate; |
10684 | ||
36a117a5 MM |
10685 | tmpl = most_general_template (tmpl); |
10686 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t)) | |
73aad9b9 | 10687 | { |
36a117a5 MM |
10688 | tree spec_args |
10689 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args); | |
10690 | if (spec_args) | |
73aad9b9 | 10691 | { |
1f8f4a0b | 10692 | list = tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list); |
73aad9b9 JM |
10693 | TREE_TYPE (list) = TREE_TYPE (t); |
10694 | } | |
10695 | } | |
10696 | ||
10697 | if (! list) | |
10698 | return NULL_TREE; | |
10699 | ||
10700 | t = list; | |
10701 | champ = t; | |
10702 | t = TREE_CHAIN (t); | |
10703 | for (; t; t = TREE_CHAIN (t)) | |
10704 | { | |
55ece1b3 | 10705 | fate = more_specialized_class (champ, t, args); |
73aad9b9 JM |
10706 | if (fate == 1) |
10707 | ; | |
10708 | else | |
10709 | { | |
10710 | if (fate == 0) | |
10711 | { | |
10712 | t = TREE_CHAIN (t); | |
10713 | if (! t) | |
10714 | return error_mark_node; | |
10715 | } | |
10716 | champ = t; | |
10717 | } | |
10718 | } | |
10719 | ||
10720 | for (t = list; t && t != champ; t = TREE_CHAIN (t)) | |
10721 | { | |
55ece1b3 | 10722 | fate = more_specialized_class (champ, t, args); |
73aad9b9 JM |
10723 | if (fate != 1) |
10724 | return error_mark_node; | |
10725 | } | |
10726 | ||
10727 | return champ; | |
10728 | } | |
10729 | ||
eb8845be | 10730 | /* Explicitly instantiate DECL. */ |
e92cc029 | 10731 | |
8d08fdba | 10732 | void |
eb8845be | 10733 | do_decl_instantiation (tree decl, tree storage) |
8d08fdba | 10734 | { |
8d08fdba | 10735 | tree result = NULL_TREE; |
faae18ab | 10736 | int extern_p = 0; |
e8abc66f | 10737 | |
3fa56191 | 10738 | if (!decl) |
dc957d14 | 10739 | /* An error occurred, for which grokdeclarator has already issued |
3fa56191 MM |
10740 | an appropriate message. */ |
10741 | return; | |
10742 | else if (! DECL_LANG_SPECIFIC (decl)) | |
ec255269 | 10743 | { |
0f51ccfc | 10744 | error ("explicit instantiation of non-template %q#D", decl); |
ec255269 MS |
10745 | return; |
10746 | } | |
03d0f4af | 10747 | else if (TREE_CODE (decl) == VAR_DECL) |
6633d636 | 10748 | { |
03d0f4af MM |
10749 | /* There is an asymmetry here in the way VAR_DECLs and |
10750 | FUNCTION_DECLs are handled by grokdeclarator. In the case of | |
10751 | the latter, the DECL we get back will be marked as a | |
10752 | template instantiation, and the appropriate | |
10753 | DECL_TEMPLATE_INFO will be set up. This does not happen for | |
10754 | VAR_DECLs so we do the lookup here. Probably, grokdeclarator | |
10755 | should handle VAR_DECLs as it currently handles | |
10756 | FUNCTION_DECLs. */ | |
86ac0575 | 10757 | result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, false); |
e0860732 | 10758 | if (!result || TREE_CODE (result) != VAR_DECL) |
03d0f4af | 10759 | { |
0f51ccfc | 10760 | error ("no matching template for %qD found", decl); |
03d0f4af MM |
10761 | return; |
10762 | } | |
6633d636 MS |
10763 | } |
10764 | else if (TREE_CODE (decl) != FUNCTION_DECL) | |
10765 | { | |
0f51ccfc | 10766 | error ("explicit instantiation of %q#D", decl); |
6633d636 MS |
10767 | return; |
10768 | } | |
03d0f4af MM |
10769 | else |
10770 | result = decl; | |
672476cb | 10771 | |
03d0f4af | 10772 | /* Check for various error cases. Note that if the explicit |
0e339752 | 10773 | instantiation is valid the RESULT will currently be marked as an |
03d0f4af MM |
10774 | *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set |
10775 | until we get here. */ | |
10776 | ||
10777 | if (DECL_TEMPLATE_SPECIALIZATION (result)) | |
672476cb | 10778 | { |
07782718 KL |
10779 | /* DR 259 [temp.spec]. |
10780 | ||
10781 | Both an explicit instantiation and a declaration of an explicit | |
10782 | specialization shall not appear in a program unless the explicit | |
10783 | instantiation follows a declaration of the explicit specialization. | |
03d0f4af | 10784 | |
07782718 KL |
10785 | For a given set of template parameters, if an explicit |
10786 | instantiation of a template appears after a declaration of an | |
10787 | explicit specialization for that template, the explicit | |
10788 | instantiation has no effect. */ | |
672476cb MM |
10789 | return; |
10790 | } | |
03d0f4af MM |
10791 | else if (DECL_EXPLICIT_INSTANTIATION (result)) |
10792 | { | |
10793 | /* [temp.spec] | |
98c1c668 | 10794 | |
03d0f4af MM |
10795 | No program shall explicitly instantiate any template more |
10796 | than once. | |
10797 | ||
4684cd27 MM |
10798 | We check DECL_NOT_REALLY_EXTERN so as not to complain when |
10799 | the first instantiation was `extern' and the second is not, | |
10800 | and EXTERN_P for the opposite case. */ | |
10801 | if (DECL_NOT_REALLY_EXTERN (result) && !extern_p) | |
0f51ccfc | 10802 | pedwarn ("duplicate explicit instantiation of %q#D", result); |
4684cd27 MM |
10803 | /* If an "extern" explicit instantiation follows an ordinary |
10804 | explicit instantiation, the template is instantiated. */ | |
10805 | if (extern_p) | |
03d0f4af MM |
10806 | return; |
10807 | } | |
10808 | else if (!DECL_IMPLICIT_INSTANTIATION (result)) | |
faae18ab | 10809 | { |
0f51ccfc | 10810 | error ("no matching template for %qD found", result); |
faae18ab MS |
10811 | return; |
10812 | } | |
03d0f4af | 10813 | else if (!DECL_TEMPLATE_INFO (result)) |
6633d636 | 10814 | { |
0f51ccfc | 10815 | pedwarn ("explicit instantiation of non-template %q#D", result); |
6633d636 MS |
10816 | return; |
10817 | } | |
10818 | ||
f0e01782 | 10819 | if (storage == NULL_TREE) |
00595019 | 10820 | ; |
faae18ab | 10821 | else if (storage == ridpointers[(int) RID_EXTERN]) |
03d0f4af | 10822 | { |
c02f5e29 | 10823 | if (pedantic && !in_system_header) |
0f51ccfc GDR |
10824 | pedwarn ("ISO C++ forbids the use of %<extern%> on explicit " |
10825 | "instantiations"); | |
03d0f4af MM |
10826 | extern_p = 1; |
10827 | } | |
f0e01782 | 10828 | else |
0f51ccfc | 10829 | error ("storage class %qD applied to template instantiation", storage); |
5566b478 | 10830 | |
5566b478 | 10831 | mark_decl_instantiated (result, extern_p); |
c91a56d2 | 10832 | if (! extern_p) |
415c974c | 10833 | instantiate_decl (result, /*defer_ok=*/1, /*undefined_ok=*/0); |
7177d104 MS |
10834 | } |
10835 | ||
faae18ab | 10836 | void |
3a978d72 | 10837 | mark_class_instantiated (tree t, int extern_p) |
faae18ab MS |
10838 | { |
10839 | SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t); | |
eb773359 JM |
10840 | SET_CLASSTYPE_INTERFACE_KNOWN (t); |
10841 | CLASSTYPE_INTERFACE_ONLY (t) = extern_p; | |
faae18ab MS |
10842 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p; |
10843 | if (! extern_p) | |
10844 | { | |
10845 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; | |
10846 | rest_of_type_compilation (t, 1); | |
10847 | } | |
10848 | } | |
e8abc66f | 10849 | |
5e0c54e5 | 10850 | /* Called from do_type_instantiation through binding_table_foreach to |
9bcb9aae | 10851 | do recursive instantiation for the type bound in ENTRY. */ |
5e0c54e5 GDR |
10852 | static void |
10853 | bt_instantiate_type_proc (binding_entry entry, void *data) | |
10854 | { | |
10855 | tree storage = *(tree *) data; | |
10856 | ||
10857 | if (IS_AGGR_TYPE (entry->type) | |
10858 | && !uses_template_parms (CLASSTYPE_TI_ARGS (entry->type))) | |
10859 | do_type_instantiation (TYPE_MAIN_DECL (entry->type), storage, 0); | |
10860 | } | |
10861 | ||
415c974c MA |
10862 | /* Called from do_type_instantiation to instantiate a member |
10863 | (a member function or a static member variable) of an | |
03fd3f84 | 10864 | explicitly instantiated class template. */ |
415c974c MA |
10865 | static void |
10866 | instantiate_class_member (tree decl, int extern_p) | |
10867 | { | |
10868 | mark_decl_instantiated (decl, extern_p); | |
415c974c MA |
10869 | if (! extern_p) |
10870 | instantiate_decl (decl, /*defer_ok=*/1, /* undefined_ok=*/1); | |
10871 | } | |
10872 | ||
a1bcc528 JM |
10873 | /* Perform an explicit instantiation of template class T. STORAGE, if |
10874 | non-null, is the RID for extern, inline or static. COMPLAIN is | |
838dfd8a | 10875 | nonzero if this is called from the parser, zero if called recursively, |
a1bcc528 JM |
10876 | since the standard is unclear (as detailed below). */ |
10877 | ||
7177d104 | 10878 | void |
3a978d72 | 10879 | do_type_instantiation (tree t, tree storage, tsubst_flags_t complain) |
7177d104 | 10880 | { |
e8abc66f MS |
10881 | int extern_p = 0; |
10882 | int nomem_p = 0; | |
5566b478 | 10883 | int static_p = 0; |
4746cf84 | 10884 | int previous_instantiation_extern_p = 0; |
5566b478 | 10885 | |
ca79f85d JM |
10886 | if (TREE_CODE (t) == TYPE_DECL) |
10887 | t = TREE_TYPE (t); | |
10888 | ||
7ddedda4 | 10889 | if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t)) |
ca79f85d | 10890 | { |
0f51ccfc | 10891 | error ("explicit instantiation of non-template type %qT", t); |
ca79f85d JM |
10892 | return; |
10893 | } | |
10894 | ||
5566b478 | 10895 | complete_type (t); |
7177d104 | 10896 | |
d0f062fb | 10897 | if (!COMPLETE_TYPE_P (t)) |
f0e01782 | 10898 | { |
c2ea3a40 | 10899 | if (complain & tf_error) |
0f51ccfc GDR |
10900 | error ("explicit instantiation of %q#T before definition of template", |
10901 | t); | |
f0e01782 MS |
10902 | return; |
10903 | } | |
10904 | ||
03d0f4af | 10905 | if (storage != NULL_TREE) |
f0e01782 | 10906 | { |
c02f5e29 | 10907 | if (pedantic && !in_system_header) |
c4f73174 | 10908 | pedwarn("ISO C++ forbids the use of %qE on explicit instantiations", |
4460cef2 | 10909 | storage); |
03d0f4af MM |
10910 | |
10911 | if (storage == ridpointers[(int) RID_INLINE]) | |
10912 | nomem_p = 1; | |
10913 | else if (storage == ridpointers[(int) RID_EXTERN]) | |
10914 | extern_p = 1; | |
10915 | else if (storage == ridpointers[(int) RID_STATIC]) | |
10916 | static_p = 1; | |
10917 | else | |
10918 | { | |
0f51ccfc GDR |
10919 | error ("storage class %qD applied to template instantiation", |
10920 | storage); | |
03d0f4af MM |
10921 | extern_p = 0; |
10922 | } | |
f0e01782 MS |
10923 | } |
10924 | ||
370af2d5 | 10925 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
03d0f4af | 10926 | { |
07782718 | 10927 | /* DR 259 [temp.spec]. |
a292b002 | 10928 | |
07782718 KL |
10929 | Both an explicit instantiation and a declaration of an explicit |
10930 | specialization shall not appear in a program unless the explicit | |
10931 | instantiation follows a declaration of the explicit specialization. | |
10932 | ||
10933 | For a given set of template parameters, if an explicit | |
10934 | instantiation of a template appears after a declaration of an | |
10935 | explicit specialization for that template, the explicit | |
10936 | instantiation has no effect. */ | |
03d0f4af MM |
10937 | return; |
10938 | } | |
10939 | else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t)) | |
44a8d0b3 | 10940 | { |
03d0f4af MM |
10941 | /* [temp.spec] |
10942 | ||
10943 | No program shall explicitly instantiate any template more | |
10944 | than once. | |
10945 | ||
4746cf84 MA |
10946 | If PREVIOUS_INSTANTIATION_EXTERN_P, then the first explicit |
10947 | instantiation was `extern'. If EXTERN_P then the second is. | |
4684cd27 | 10948 | These cases are OK. */ |
4746cf84 MA |
10949 | previous_instantiation_extern_p = CLASSTYPE_INTERFACE_ONLY (t); |
10950 | ||
10951 | if (!previous_instantiation_extern_p && !extern_p | |
c2ea3a40 | 10952 | && (complain & tf_error)) |
0f51ccfc | 10953 | pedwarn ("duplicate explicit instantiation of %q#T", t); |
03d0f4af MM |
10954 | |
10955 | /* If we've already instantiated the template, just return now. */ | |
10956 | if (!CLASSTYPE_INTERFACE_ONLY (t)) | |
10957 | return; | |
44a8d0b3 | 10958 | } |
e8abc66f | 10959 | |
03d0f4af | 10960 | mark_class_instantiated (t, extern_p); |
03d0f4af | 10961 | |
e8abc66f MS |
10962 | if (nomem_p) |
10963 | return; | |
10964 | ||
7177d104 | 10965 | { |
db5ae43f | 10966 | tree tmp; |
5566b478 | 10967 | |
03d0f4af MM |
10968 | /* In contrast to implicit instantiation, where only the |
10969 | declarations, and not the definitions, of members are | |
10970 | instantiated, we have here: | |
10971 | ||
10972 | [temp.explicit] | |
10973 | ||
10974 | The explicit instantiation of a class template specialization | |
10975 | implies the instantiation of all of its members not | |
10976 | previously explicitly specialized in the translation unit | |
10977 | containing the explicit instantiation. | |
10978 | ||
10979 | Of course, we can't instantiate member template classes, since | |
10980 | we don't have any arguments for them. Note that the standard | |
dc957d14 | 10981 | is unclear on whether the instantiation of the members are |
415c974c | 10982 | *explicit* instantiations or not. However, the most natural |
03fd3f84 | 10983 | interpretation is that it should be an explicit instantiation. */ |
03d0f4af | 10984 | |
5566b478 MS |
10985 | if (! static_p) |
10986 | for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
a7d87521 | 10987 | if (TREE_CODE (tmp) == FUNCTION_DECL |
1f109f0f | 10988 | && DECL_TEMPLATE_INSTANTIATION (tmp)) |
415c974c | 10989 | instantiate_class_member (tmp, extern_p); |
5566b478 MS |
10990 | |
10991 | for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
10992 | if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp)) | |
415c974c | 10993 | instantiate_class_member (tmp, extern_p); |
7177d104 | 10994 | |
5e0c54e5 GDR |
10995 | if (CLASSTYPE_NESTED_UTDS (t)) |
10996 | binding_table_foreach (CLASSTYPE_NESTED_UTDS (t), | |
10997 | bt_instantiate_type_proc, &storage); | |
a292b002 | 10998 | } |
8d08fdba | 10999 | } |
a28e3c7f | 11000 | |
36a117a5 MM |
11001 | /* Given a function DECL, which is a specialization of TMPL, modify |
11002 | DECL to be a re-instantiation of TMPL with the same template | |
11003 | arguments. TMPL should be the template into which tsubst'ing | |
11004 | should occur for DECL, not the most general template. | |
830bfa74 MM |
11005 | |
11006 | One reason for doing this is a scenario like this: | |
11007 | ||
11008 | template <class T> | |
11009 | void f(const T&, int i); | |
11010 | ||
11011 | void g() { f(3, 7); } | |
11012 | ||
11013 | template <class T> | |
11014 | void f(const T& t, const int i) { } | |
11015 | ||
11016 | Note that when the template is first instantiated, with | |
11017 | instantiate_template, the resulting DECL will have no name for the | |
11018 | first parameter, and the wrong type for the second. So, when we go | |
11019 | to instantiate the DECL, we regenerate it. */ | |
11020 | ||
e9659ab0 | 11021 | static void |
3a978d72 | 11022 | regenerate_decl_from_template (tree decl, tree tmpl) |
830bfa74 | 11023 | { |
f9a7ae04 MM |
11024 | /* The arguments used to instantiate DECL, from the most general |
11025 | template. */ | |
830bfa74 | 11026 | tree args; |
830bfa74 | 11027 | tree code_pattern; |
830bfa74 MM |
11028 | |
11029 | args = DECL_TI_ARGS (decl); | |
11030 | code_pattern = DECL_TEMPLATE_RESULT (tmpl); | |
11031 | ||
2b907f5c KL |
11032 | /* Make sure that we can see identifiers, and compute access |
11033 | correctly. */ | |
11034 | push_access_scope (decl); | |
11035 | ||
c7222c02 MM |
11036 | if (TREE_CODE (decl) == FUNCTION_DECL) |
11037 | { | |
11038 | tree decl_parm; | |
11039 | tree pattern_parm; | |
11040 | tree specs; | |
11041 | int args_depth; | |
11042 | int parms_depth; | |
11043 | ||
11044 | args_depth = TMPL_ARGS_DEPTH (args); | |
11045 | parms_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)); | |
11046 | if (args_depth > parms_depth) | |
11047 | args = get_innermost_template_args (args, parms_depth); | |
11048 | ||
11049 | specs = tsubst_exception_specification (TREE_TYPE (code_pattern), | |
11050 | args, tf_error, NULL_TREE); | |
11051 | if (specs) | |
11052 | TREE_TYPE (decl) = build_exception_variant (TREE_TYPE (decl), | |
11053 | specs); | |
11054 | ||
11055 | /* Merge parameter declarations. */ | |
11056 | decl_parm = skip_artificial_parms_for (decl, | |
11057 | DECL_ARGUMENTS (decl)); | |
11058 | pattern_parm | |
11059 | = skip_artificial_parms_for (code_pattern, | |
11060 | DECL_ARGUMENTS (code_pattern)); | |
11061 | while (decl_parm) | |
11062 | { | |
11063 | tree parm_type; | |
11064 | ||
11065 | if (DECL_NAME (decl_parm) != DECL_NAME (pattern_parm)) | |
11066 | DECL_NAME (decl_parm) = DECL_NAME (pattern_parm); | |
11067 | parm_type = tsubst (TREE_TYPE (pattern_parm), args, tf_error, | |
11068 | NULL_TREE); | |
11069 | if (!same_type_p (TREE_TYPE (decl_parm), parm_type)) | |
11070 | TREE_TYPE (decl_parm) = parm_type; | |
11071 | decl_parm = TREE_CHAIN (decl_parm); | |
11072 | pattern_parm = TREE_CHAIN (pattern_parm); | |
11073 | } | |
830bfa74 | 11074 | |
c7222c02 MM |
11075 | /* Merge additional specifiers from the CODE_PATTERN. */ |
11076 | if (DECL_DECLARED_INLINE_P (code_pattern) | |
11077 | && !DECL_DECLARED_INLINE_P (decl)) | |
11078 | DECL_DECLARED_INLINE_P (decl) = 1; | |
11079 | if (DECL_INLINE (code_pattern) && !DECL_INLINE (decl)) | |
11080 | DECL_INLINE (decl) = 1; | |
11081 | } | |
11082 | else if (TREE_CODE (decl) == VAR_DECL) | |
830bfa74 | 11083 | { |
c7222c02 MM |
11084 | if (!DECL_INITIALIZED_IN_CLASS_P (decl) |
11085 | && DECL_INITIAL (code_pattern)) | |
11086 | DECL_INITIAL (decl) = | |
17bbb839 MM |
11087 | tsubst_expr (DECL_INITIAL (code_pattern), args, |
11088 | tf_error, DECL_TI_TEMPLATE (decl)); | |
830bfa74 | 11089 | } |
c7222c02 MM |
11090 | else |
11091 | gcc_unreachable (); | |
36a117a5 | 11092 | |
2b59fc25 | 11093 | pop_access_scope (decl); |
830bfa74 MM |
11094 | } |
11095 | ||
a723baf1 MM |
11096 | /* Return the TEMPLATE_DECL into which DECL_TI_ARGS(DECL) should be |
11097 | substituted to get DECL. */ | |
11098 | ||
d58b7c2d | 11099 | tree |
a723baf1 MM |
11100 | template_for_substitution (tree decl) |
11101 | { | |
11102 | tree tmpl = DECL_TI_TEMPLATE (decl); | |
11103 | ||
11104 | /* Set TMPL to the template whose DECL_TEMPLATE_RESULT is the pattern | |
11105 | for the instantiation. This is not always the most general | |
11106 | template. Consider, for example: | |
11107 | ||
11108 | template <class T> | |
11109 | struct S { template <class U> void f(); | |
11110 | template <> void f<int>(); }; | |
11111 | ||
11112 | and an instantiation of S<double>::f<int>. We want TD to be the | |
11113 | specialization S<T>::f<int>, not the more general S<T>::f<U>. */ | |
11114 | while (/* An instantiation cannot have a definition, so we need a | |
11115 | more general template. */ | |
11116 | DECL_TEMPLATE_INSTANTIATION (tmpl) | |
11117 | /* We must also deal with friend templates. Given: | |
11118 | ||
11119 | template <class T> struct S { | |
11120 | template <class U> friend void f() {}; | |
11121 | }; | |
11122 | ||
11123 | S<int>::f<U> say, is not an instantiation of S<T>::f<U>, | |
11124 | so far as the language is concerned, but that's still | |
11125 | where we get the pattern for the instantiation from. On | |
11126 | other hand, if the definition comes outside the class, say: | |
11127 | ||
11128 | template <class T> struct S { | |
11129 | template <class U> friend void f(); | |
11130 | }; | |
11131 | template <class U> friend void f() {} | |
11132 | ||
11133 | we don't need to look any further. That's what the check for | |
11134 | DECL_INITIAL is for. */ | |
11135 | || (TREE_CODE (decl) == FUNCTION_DECL | |
11136 | && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (tmpl) | |
11137 | && !DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl)))) | |
11138 | { | |
11139 | /* The present template, TD, should not be a definition. If it | |
11140 | were a definition, we should be using it! Note that we | |
11141 | cannot restructure the loop to just keep going until we find | |
11142 | a template with a definition, since that might go too far if | |
11143 | a specialization was declared, but not defined. */ | |
50bc768d NS |
11144 | gcc_assert (TREE_CODE (decl) != VAR_DECL |
11145 | || DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (tmpl))); | |
a723baf1 MM |
11146 | |
11147 | /* Fetch the more general template. */ | |
11148 | tmpl = DECL_TI_TEMPLATE (tmpl); | |
11149 | } | |
11150 | ||
11151 | return tmpl; | |
11152 | } | |
11153 | ||
16d53b64 | 11154 | /* Produce the definition of D, a _DECL generated from a template. If |
838dfd8a | 11155 | DEFER_OK is nonzero, then we don't have to actually do the |
415c974c MA |
11156 | instantiation now; we just have to do it sometime. Normally it is |
11157 | an error if this is an explicit instantiation but D is undefined. | |
11158 | If UNDEFINED_OK is nonzero, then instead we treat it as an implicit | |
11159 | instantiation. UNDEFINED_OK is nonzero only if we are being used | |
11160 | to instantiate the members of an explicitly instantiated class | |
03fd3f84 | 11161 | template. */ |
415c974c | 11162 | |
f84b4be9 | 11163 | |
a28e3c7f | 11164 | tree |
415c974c | 11165 | instantiate_decl (tree d, int defer_ok, int undefined_ok) |
a28e3c7f | 11166 | { |
36a117a5 | 11167 | tree tmpl = DECL_TI_TEMPLATE (d); |
65f8b0fb MM |
11168 | tree gen_args; |
11169 | tree args; | |
830bfa74 | 11170 | tree td; |
36a117a5 MM |
11171 | tree code_pattern; |
11172 | tree spec; | |
11173 | tree gen_tmpl; | |
5566b478 | 11174 | int pattern_defined; |
31a714f6 | 11175 | int need_push; |
82a98427 NS |
11176 | location_t saved_loc = input_location; |
11177 | ||
36a117a5 MM |
11178 | /* This function should only be used to instantiate templates for |
11179 | functions and static member variables. */ | |
50bc768d NS |
11180 | gcc_assert (TREE_CODE (d) == FUNCTION_DECL |
11181 | || TREE_CODE (d) == VAR_DECL); | |
36a117a5 | 11182 | |
cec24319 MM |
11183 | /* Variables are never deferred; if instantiation is required, they |
11184 | are instantiated right away. That allows for better code in the | |
11185 | case that an expression refers to the value of the variable -- | |
11186 | if the variable has a constant value the referring expression can | |
11187 | take advantage of that fact. */ | |
11188 | if (TREE_CODE (d) == VAR_DECL) | |
11189 | defer_ok = 0; | |
11190 | ||
db9b2174 MM |
11191 | /* Don't instantiate cloned functions. Instead, instantiate the |
11192 | functions they cloned. */ | |
11193 | if (TREE_CODE (d) == FUNCTION_DECL && DECL_CLONED_FUNCTION_P (d)) | |
11194 | d = DECL_CLONED_FUNCTION (d); | |
11195 | ||
fbf1c34b | 11196 | if (DECL_TEMPLATE_INSTANTIATED (d)) |
03d0f4af | 11197 | /* D has already been instantiated. It might seem reasonable to |
dc957d14 | 11198 | check whether or not D is an explicit instantiation, and, if so, |
03d0f4af MM |
11199 | stop here. But when an explicit instantiation is deferred |
11200 | until the end of the compilation, DECL_EXPLICIT_INSTANTIATION | |
11201 | is set, even though we still need to do the instantiation. */ | |
36a117a5 MM |
11202 | return d; |
11203 | ||
11204 | /* If we already have a specialization of this declaration, then | |
11205 | there's no reason to instantiate it. Note that | |
11206 | retrieve_specialization gives us both instantiations and | |
11207 | specializations, so we must explicitly check | |
11208 | DECL_TEMPLATE_SPECIALIZATION. */ | |
11209 | gen_tmpl = most_general_template (tmpl); | |
65f8b0fb | 11210 | gen_args = DECL_TI_ARGS (d); |
c7222c02 MM |
11211 | spec = retrieve_specialization (gen_tmpl, gen_args, |
11212 | /*class_specializations_p=*/false); | |
36a117a5 MM |
11213 | if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec)) |
11214 | return spec; | |
11215 | ||
11216 | /* This needs to happen before any tsubsting. */ | |
11217 | if (! push_tinst_level (d)) | |
11218 | return d; | |
11219 | ||
297a5329 JM |
11220 | timevar_push (TV_PARSE); |
11221 | ||
c1f927e8 | 11222 | /* We may be in the middle of deferred access check. Disable it now. */ |
7d021397 KL |
11223 | push_deferring_access_checks (dk_no_deferred); |
11224 | ||
4d85e00e | 11225 | /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern |
a723baf1 MM |
11226 | for the instantiation. */ |
11227 | td = template_for_substitution (d); | |
fee23f54 | 11228 | code_pattern = DECL_TEMPLATE_RESULT (td); |
27bb8339 | 11229 | |
76d3baad KL |
11230 | if ((DECL_NAMESPACE_SCOPE_P (d) && !DECL_INITIALIZED_IN_CLASS_P (d)) |
11231 | || DECL_TEMPLATE_SPECIALIZATION (td)) | |
649fc72d NS |
11232 | /* In the case of a friend template whose definition is provided |
11233 | outside the class, we may have too many arguments. Drop the | |
76d3baad | 11234 | ones we don't need. The same is true for specializations. */ |
649fc72d NS |
11235 | args = get_innermost_template_args |
11236 | (gen_args, TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (td))); | |
11237 | else | |
11238 | args = gen_args; | |
65f8b0fb | 11239 | |
5566b478 | 11240 | if (TREE_CODE (d) == FUNCTION_DECL) |
39c76b4f | 11241 | pattern_defined = (DECL_SAVED_TREE (code_pattern) != NULL_TREE); |
5566b478 | 11242 | else |
36a117a5 | 11243 | pattern_defined = ! DECL_IN_AGGR_P (code_pattern); |
4684cd27 MM |
11244 | /* Unless an explicit instantiation directive has already determined |
11245 | the linkage of D, remember that a definition is available for | |
11246 | this entity. */ | |
11247 | if (pattern_defined | |
11248 | && !DECL_INTERFACE_KNOWN (d) | |
11249 | && !DECL_NOT_REALLY_EXTERN (d)) | |
11250 | mark_definable (d); | |
de22184b | 11251 | |
f31686a3 | 11252 | input_location = DECL_SOURCE_LOCATION (d); |
de22184b | 11253 | |
4684cd27 | 11254 | if (! pattern_defined && DECL_EXPLICIT_INSTANTIATION (d) && undefined_ok) |
5566b478 | 11255 | { |
4684cd27 MM |
11256 | DECL_NOT_REALLY_EXTERN (d) = 0; |
11257 | SET_DECL_IMPLICIT_INSTANTIATION (d); | |
5566b478 MS |
11258 | } |
11259 | ||
4f2b0fb2 NS |
11260 | if (!defer_ok) |
11261 | { | |
11262 | /* Recheck the substitutions to obtain any warning messages | |
11263 | about ignoring cv qualifiers. */ | |
11264 | tree gen = DECL_TEMPLATE_RESULT (gen_tmpl); | |
11265 | tree type = TREE_TYPE (gen); | |
11266 | ||
0e902d98 | 11267 | /* Make sure that we can see identifiers, and compute access |
2b59fc25 KL |
11268 | correctly. D is already the target FUNCTION_DECL with the |
11269 | right context. */ | |
11270 | push_access_scope (d); | |
0e902d98 | 11271 | |
4f2b0fb2 NS |
11272 | if (TREE_CODE (gen) == FUNCTION_DECL) |
11273 | { | |
65f8b0fb MM |
11274 | tsubst (DECL_ARGUMENTS (gen), gen_args, tf_error | tf_warning, d); |
11275 | tsubst (TYPE_RAISES_EXCEPTIONS (type), gen_args, | |
4f2b0fb2 NS |
11276 | tf_error | tf_warning, d); |
11277 | /* Don't simply tsubst the function type, as that will give | |
11278 | duplicate warnings about poor parameter qualifications. | |
11279 | The function arguments are the same as the decl_arguments | |
c6002625 | 11280 | without the top level cv qualifiers. */ |
4f2b0fb2 NS |
11281 | type = TREE_TYPE (type); |
11282 | } | |
65f8b0fb | 11283 | tsubst (type, gen_args, tf_error | tf_warning, d); |
0e902d98 | 11284 | |
2b59fc25 | 11285 | pop_access_scope (d); |
4f2b0fb2 NS |
11286 | } |
11287 | ||
4684cd27 MM |
11288 | /* We should have set up DECL_INITIAL in instantiate_class_template |
11289 | for in-class definitions of static data members. */ | |
50bc768d NS |
11290 | gcc_assert (!(TREE_CODE (d) == VAR_DECL |
11291 | && DECL_INITIALIZED_IN_CLASS_P (d) | |
11292 | && DECL_INITIAL (d) == NULL_TREE)); | |
4684cd27 MM |
11293 | |
11294 | /* Do not instantiate templates that we know will be defined | |
11295 | elsewhere. */ | |
11296 | if (DECL_INTERFACE_KNOWN (d) | |
11297 | && DECL_REALLY_EXTERN (d) | |
11298 | && ! (TREE_CODE (d) == FUNCTION_DECL | |
11299 | && DECL_INLINE (d))) | |
930cd796 | 11300 | goto out; |
16d53b64 MM |
11301 | /* Defer all other templates, unless we have been explicitly |
11302 | forbidden from doing so. We restore the source position here | |
11303 | because it's used by add_pending_template. */ | |
11304 | else if (! pattern_defined || defer_ok) | |
11305 | { | |
82a98427 | 11306 | input_location = saved_loc; |
c27be9b9 | 11307 | |
03d0f4af MM |
11308 | if (at_eof && !pattern_defined |
11309 | && DECL_EXPLICIT_INSTANTIATION (d)) | |
11310 | /* [temp.explicit] | |
11311 | ||
11312 | The definition of a non-exported function template, a | |
11313 | non-exported member function template, or a non-exported | |
11314 | member function or static data member of a class template | |
11315 | shall be present in every translation unit in which it is | |
11316 | explicitly instantiated. */ | |
33bd39a2 | 11317 | pedwarn |
0f51ccfc | 11318 | ("explicit instantiation of %qD but no definition available", d); |
03d0f4af | 11319 | |
5566b478 | 11320 | add_pending_template (d); |
de22184b | 11321 | goto out; |
5566b478 | 11322 | } |
4684cd27 MM |
11323 | /* Tell the repository that D is available in this translation unit |
11324 | -- and see if it is supposed to be instantiated here. */ | |
11325 | if (TREE_PUBLIC (d) && !DECL_REALLY_EXTERN (d) && !repo_emit_p (d)) | |
11326 | { | |
11327 | /* In a PCH file, despite the fact that the repository hasn't | |
11328 | requested instantiation in the PCH it is still possible that | |
11329 | an instantiation will be required in a file that includes the | |
11330 | PCH. */ | |
11331 | if (pch_file) | |
11332 | add_pending_template (d); | |
11333 | /* Instantiate inline functions so that the inliner can do its | |
11334 | job, even though we'll not be emitting a copy of this | |
11335 | function. */ | |
c2a124b2 MM |
11336 | if (!(TREE_CODE (d) == FUNCTION_DECL |
11337 | && flag_inline_trees | |
11338 | && DECL_DECLARED_INLINE_P (d))) | |
4684cd27 MM |
11339 | goto out; |
11340 | } | |
5566b478 | 11341 | |
6de9cd9a | 11342 | need_push = !cfun || !global_bindings_p (); |
31a714f6 MM |
11343 | if (need_push) |
11344 | push_to_top_level (); | |
414ea4aa | 11345 | |
66e0c440 KL |
11346 | /* Mark D as instantiated so that recursive calls to |
11347 | instantiate_decl do not try to instantiate it again. */ | |
11348 | DECL_TEMPLATE_INSTANTIATED (d) = 1; | |
11349 | ||
2b0a63a3 MM |
11350 | /* Regenerate the declaration in case the template has been modified |
11351 | by a subsequent redeclaration. */ | |
11352 | regenerate_decl_from_template (d, td); | |
4684cd27 | 11353 | |
120722ac | 11354 | /* We already set the file and line above. Reset them now in case |
6de9cd9a | 11355 | they changed as a result of calling regenerate_decl_from_template. */ |
f31686a3 | 11356 | input_location = DECL_SOURCE_LOCATION (d); |
5156628f | 11357 | |
5566b478 MS |
11358 | if (TREE_CODE (d) == VAR_DECL) |
11359 | { | |
1d62c33e MM |
11360 | /* Clear out DECL_RTL; whatever was there before may not be right |
11361 | since we've reset the type of the declaration. */ | |
11362 | SET_DECL_RTL (d, NULL_RTX); | |
5566b478 | 11363 | DECL_IN_AGGR_P (d) = 0; |
ea56c40c | 11364 | |
4684cd27 MM |
11365 | /* Clear DECL_EXTERNAL so that cp_finish_decl will process the |
11366 | initializer. That function will defer actual emission until | |
11367 | we have a chance to determine linkage. */ | |
11368 | DECL_EXTERNAL (d) = 0; | |
11369 | ||
73a8adb6 | 11370 | /* Enter the scope of D so that access-checking works correctly. */ |
4684cd27 MM |
11371 | push_nested_class (DECL_CONTEXT (d)); |
11372 | cp_finish_decl (d, | |
11373 | (!DECL_INITIALIZED_IN_CLASS_P (d) | |
11374 | ? DECL_INITIAL (d) : NULL_TREE), | |
11375 | NULL_TREE, 0); | |
73a8adb6 | 11376 | pop_nested_class (); |
5566b478 MS |
11377 | } |
11378 | else if (TREE_CODE (d) == FUNCTION_DECL) | |
11379 | { | |
6bbf1598 | 11380 | htab_t saved_local_specializations; |
a723baf1 MM |
11381 | tree subst_decl; |
11382 | tree tmpl_parm; | |
11383 | tree spec_parm; | |
6bbf1598 MM |
11384 | |
11385 | /* Save away the current list, in case we are instantiating one | |
11386 | template from within the body of another. */ | |
11387 | saved_local_specializations = local_specializations; | |
11388 | ||
6dfbb909 | 11389 | /* Set up the list of local specializations. */ |
6dfbb909 | 11390 | local_specializations = htab_create (37, |
69f794a7 | 11391 | hash_local_specialization, |
a723baf1 | 11392 | eq_local_specializations, |
6dfbb909 MM |
11393 | NULL); |
11394 | ||
558475f0 | 11395 | /* Set up context. */ |
058b15c1 | 11396 | start_preparsed_function (d, NULL_TREE, SF_PRE_PARSED); |
5566b478 | 11397 | |
a723baf1 MM |
11398 | /* Create substitution entries for the parameters. */ |
11399 | subst_decl = DECL_TEMPLATE_RESULT (template_for_substitution (d)); | |
11400 | tmpl_parm = DECL_ARGUMENTS (subst_decl); | |
11401 | spec_parm = DECL_ARGUMENTS (d); | |
11402 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (d)) | |
11403 | { | |
11404 | register_local_specialization (spec_parm, tmpl_parm); | |
11405 | spec_parm = skip_artificial_parms_for (d, spec_parm); | |
11406 | tmpl_parm = skip_artificial_parms_for (subst_decl, tmpl_parm); | |
11407 | } | |
11408 | while (tmpl_parm) | |
11409 | { | |
11410 | register_local_specialization (spec_parm, tmpl_parm); | |
11411 | tmpl_parm = TREE_CHAIN (tmpl_parm); | |
11412 | spec_parm = TREE_CHAIN (spec_parm); | |
11413 | } | |
50bc768d | 11414 | gcc_assert (!spec_parm); |
a723baf1 | 11415 | |
558475f0 MM |
11416 | /* Substitute into the body of the function. */ |
11417 | tsubst_expr (DECL_SAVED_TREE (code_pattern), args, | |
c2ea3a40 | 11418 | tf_error | tf_warning, tmpl); |
558475f0 | 11419 | |
6dfbb909 MM |
11420 | /* We don't need the local specializations any more. */ |
11421 | htab_delete (local_specializations); | |
6bbf1598 | 11422 | local_specializations = saved_local_specializations; |
6dfbb909 | 11423 | |
4d6abc1c | 11424 | /* Finish the function. */ |
b2dd096b | 11425 | d = finish_function (0); |
8cd2462c | 11426 | expand_or_defer_fn (d); |
5566b478 MS |
11427 | } |
11428 | ||
971cbc14 MM |
11429 | /* We're not deferring instantiation any more. */ |
11430 | TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d)) = 0; | |
11431 | ||
31a714f6 MM |
11432 | if (need_push) |
11433 | pop_from_top_level (); | |
414ea4aa | 11434 | |
de22184b | 11435 | out: |
82a98427 | 11436 | input_location = saved_loc; |
7d021397 | 11437 | pop_deferring_access_checks (); |
5566b478 | 11438 | pop_tinst_level (); |
a28e3c7f | 11439 | |
297a5329 JM |
11440 | timevar_pop (TV_PARSE); |
11441 | ||
a28e3c7f MS |
11442 | return d; |
11443 | } | |
5566b478 | 11444 | |
0aafb128 | 11445 | /* Run through the list of templates that we wish we could |
35046a54 KL |
11446 | instantiate, and instantiate any we can. RETRIES is the |
11447 | number of times we retry pending template instantiation. */ | |
0aafb128 | 11448 | |
35046a54 KL |
11449 | void |
11450 | instantiate_pending_templates (int retries) | |
0aafb128 MM |
11451 | { |
11452 | tree *t; | |
46ccf50a | 11453 | tree last = NULL_TREE; |
0aafb128 | 11454 | int reconsider; |
aad626f7 | 11455 | location_t saved_loc = input_location; |
35046a54 KL |
11456 | |
11457 | /* Instantiating templates may trigger vtable generation. This in turn | |
11458 | may require further template instantiations. We place a limit here | |
11459 | to avoid infinite loop. */ | |
11460 | if (pending_templates && retries >= max_tinst_depth) | |
11461 | { | |
11462 | cp_error_at ("template instantiation depth exceeds maximum of %d" | |
11463 | " (use -ftemplate-depth-NN to increase the maximum)" | |
0f51ccfc | 11464 | " instantiating %q+D, possibly from virtual table" |
35046a54 KL |
11465 | " generation", |
11466 | max_tinst_depth, TREE_VALUE (pending_templates)); | |
11467 | return; | |
11468 | } | |
11469 | ||
0aafb128 MM |
11470 | do |
11471 | { | |
11472 | reconsider = 0; | |
11473 | ||
11474 | t = &pending_templates; | |
11475 | while (*t) | |
11476 | { | |
0aafb128 MM |
11477 | tree instantiation = TREE_VALUE (*t); |
11478 | ||
3ae18eaf | 11479 | reopen_tinst_level (TREE_PURPOSE (*t)); |
0aafb128 | 11480 | |
2f939d94 | 11481 | if (TYPE_P (instantiation)) |
0aafb128 MM |
11482 | { |
11483 | tree fn; | |
11484 | ||
d0f062fb | 11485 | if (!COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
11486 | { |
11487 | instantiate_class_template (instantiation); | |
11488 | if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation)) | |
11489 | for (fn = TYPE_METHODS (instantiation); | |
11490 | fn; | |
11491 | fn = TREE_CHAIN (fn)) | |
11492 | if (! DECL_ARTIFICIAL (fn)) | |
061cae1f NS |
11493 | instantiate_decl (fn, /*defer_ok=*/0, |
11494 | /*undefined_ok=*/0); | |
d0f062fb | 11495 | if (COMPLETE_TYPE_P (instantiation)) |
35046a54 | 11496 | reconsider = 1; |
0aafb128 MM |
11497 | } |
11498 | ||
d0f062fb | 11499 | if (COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
11500 | /* If INSTANTIATION has been instantiated, then we don't |
11501 | need to consider it again in the future. */ | |
11502 | *t = TREE_CHAIN (*t); | |
46ccf50a JM |
11503 | else |
11504 | { | |
11505 | last = *t; | |
11506 | t = &TREE_CHAIN (*t); | |
11507 | } | |
0aafb128 MM |
11508 | } |
11509 | else | |
11510 | { | |
16d53b64 | 11511 | if (!DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
11512 | && !DECL_TEMPLATE_INSTANTIATED (instantiation)) |
11513 | { | |
16d53b64 | 11514 | instantiation = instantiate_decl (instantiation, |
415c974c MA |
11515 | /*defer_ok=*/0, |
11516 | /*undefined_ok=*/0); | |
0aafb128 | 11517 | if (DECL_TEMPLATE_INSTANTIATED (instantiation)) |
35046a54 | 11518 | reconsider = 1; |
0aafb128 MM |
11519 | } |
11520 | ||
16d53b64 | 11521 | if (DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
11522 | || DECL_TEMPLATE_INSTANTIATED (instantiation)) |
11523 | /* If INSTANTIATION has been instantiated, then we don't | |
11524 | need to consider it again in the future. */ | |
11525 | *t = TREE_CHAIN (*t); | |
46ccf50a JM |
11526 | else |
11527 | { | |
11528 | last = *t; | |
11529 | t = &TREE_CHAIN (*t); | |
11530 | } | |
0aafb128 | 11531 | } |
84e5ca0f NS |
11532 | tinst_depth = 0; |
11533 | current_tinst_level = NULL_TREE; | |
0aafb128 | 11534 | } |
46ccf50a | 11535 | last_pending_template = last; |
0aafb128 MM |
11536 | } |
11537 | while (reconsider); | |
11538 | ||
aad626f7 | 11539 | input_location = saved_loc; |
0aafb128 MM |
11540 | } |
11541 | ||
fd74ca0b MM |
11542 | /* Substitute ARGVEC into T, which is a list of initializers for |
11543 | either base class or a non-static data member. The TREE_PURPOSEs | |
11544 | are DECLs, and the TREE_VALUEs are the initializer values. Used by | |
11545 | instantiate_decl. */ | |
4393e105 | 11546 | |
824b9a4c | 11547 | static tree |
3a978d72 | 11548 | tsubst_initializer_list (tree t, tree argvec) |
5566b478 | 11549 | { |
2282d28d | 11550 | tree inits = NULL_TREE; |
5566b478 MS |
11551 | |
11552 | for (; t; t = TREE_CHAIN (t)) | |
11553 | { | |
fd74ca0b MM |
11554 | tree decl; |
11555 | tree init; | |
fd74ca0b | 11556 | |
c2ea3a40 | 11557 | decl = tsubst_copy (TREE_PURPOSE (t), argvec, tf_error | tf_warning, |
fd74ca0b | 11558 | NULL_TREE); |
1f5a253a NS |
11559 | decl = expand_member_init (decl); |
11560 | if (decl && !DECL_P (decl)) | |
11561 | in_base_initializer = 1; | |
11562 | ||
c2ea3a40 | 11563 | init = tsubst_expr (TREE_VALUE (t), argvec, tf_error | tf_warning, |
fd74ca0b | 11564 | NULL_TREE); |
1f5a253a NS |
11565 | in_base_initializer = 0; |
11566 | ||
11567 | if (decl) | |
2282d28d | 11568 | { |
1f5a253a | 11569 | init = build_tree_list (decl, init); |
2282d28d MM |
11570 | TREE_CHAIN (init) = inits; |
11571 | inits = init; | |
11572 | } | |
5566b478 | 11573 | } |
2282d28d | 11574 | return inits; |
5566b478 MS |
11575 | } |
11576 | ||
61a127b3 MM |
11577 | /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */ |
11578 | ||
11579 | static void | |
3a978d72 | 11580 | set_current_access_from_decl (tree decl) |
61a127b3 MM |
11581 | { |
11582 | if (TREE_PRIVATE (decl)) | |
11583 | current_access_specifier = access_private_node; | |
11584 | else if (TREE_PROTECTED (decl)) | |
11585 | current_access_specifier = access_protected_node; | |
11586 | else | |
11587 | current_access_specifier = access_public_node; | |
11588 | } | |
11589 | ||
dbfe2124 MM |
11590 | /* Instantiate an enumerated type. TAG is the template type, NEWTAG |
11591 | is the instantiation (which should have been created with | |
11592 | start_enum) and ARGS are the template arguments to use. */ | |
b87692e5 | 11593 | |
dbfe2124 | 11594 | static void |
3a978d72 | 11595 | tsubst_enum (tree tag, tree newtag, tree args) |
b87692e5 | 11596 | { |
dbfe2124 | 11597 | tree e; |
b87692e5 MS |
11598 | |
11599 | for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e)) | |
11600 | { | |
61a127b3 | 11601 | tree value; |
7b6d72fc MM |
11602 | tree decl; |
11603 | ||
11604 | decl = TREE_VALUE (e); | |
61a127b3 MM |
11605 | /* Note that in a template enum, the TREE_VALUE is the |
11606 | CONST_DECL, not the corresponding INTEGER_CST. */ | |
7b6d72fc | 11607 | value = tsubst_expr (DECL_INITIAL (decl), |
c2ea3a40 | 11608 | args, tf_error | tf_warning, |
4393e105 | 11609 | NULL_TREE); |
61a127b3 MM |
11610 | |
11611 | /* Give this enumeration constant the correct access. */ | |
7b6d72fc | 11612 | set_current_access_from_decl (decl); |
61a127b3 MM |
11613 | |
11614 | /* Actually build the enumerator itself. */ | |
7b6d72fc | 11615 | build_enumerator (DECL_NAME (decl), value, newtag); |
dbfe2124 | 11616 | } |
b3d5a58b | 11617 | |
219670f1 | 11618 | finish_enum (newtag); |
f31686a3 RH |
11619 | DECL_SOURCE_LOCATION (TYPE_NAME (newtag)) |
11620 | = DECL_SOURCE_LOCATION (TYPE_NAME (tag)); | |
b87692e5 | 11621 | } |
36a117a5 | 11622 | |
1f6e1acc AS |
11623 | /* DECL is a FUNCTION_DECL that is a template specialization. Return |
11624 | its type -- but without substituting the innermost set of template | |
11625 | arguments. So, innermost set of template parameters will appear in | |
5c74d5b0 | 11626 | the type. */ |
1f6e1acc AS |
11627 | |
11628 | tree | |
3a978d72 | 11629 | get_mostly_instantiated_function_type (tree decl) |
1f6e1acc | 11630 | { |
1f6e1acc AS |
11631 | tree fn_type; |
11632 | tree tmpl; | |
11633 | tree targs; | |
11634 | tree tparms; | |
11635 | int parm_depth; | |
11636 | ||
11637 | tmpl = most_general_template (DECL_TI_TEMPLATE (decl)); | |
11638 | targs = DECL_TI_ARGS (decl); | |
11639 | tparms = DECL_TEMPLATE_PARMS (tmpl); | |
11640 | parm_depth = TMPL_PARMS_DEPTH (tparms); | |
11641 | ||
11642 | /* There should be as many levels of arguments as there are levels | |
11643 | of parameters. */ | |
50bc768d | 11644 | gcc_assert (parm_depth == TMPL_ARGS_DEPTH (targs)); |
1f6e1acc AS |
11645 | |
11646 | fn_type = TREE_TYPE (tmpl); | |
1f6e1acc AS |
11647 | |
11648 | if (parm_depth == 1) | |
11649 | /* No substitution is necessary. */ | |
11650 | ; | |
11651 | else | |
11652 | { | |
fae6e246 | 11653 | int i, save_access_control; |
1f6e1acc AS |
11654 | tree partial_args; |
11655 | ||
11656 | /* Replace the innermost level of the TARGS with NULL_TREEs to | |
dc957d14 | 11657 | let tsubst know not to substitute for those parameters. */ |
1f6e1acc AS |
11658 | partial_args = make_tree_vec (TREE_VEC_LENGTH (targs)); |
11659 | for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i) | |
11660 | SET_TMPL_ARGS_LEVEL (partial_args, i, | |
11661 | TMPL_ARGS_LEVEL (targs, i)); | |
11662 | SET_TMPL_ARGS_LEVEL (partial_args, | |
11663 | TMPL_ARGS_DEPTH (targs), | |
11664 | make_tree_vec (DECL_NTPARMS (tmpl))); | |
11665 | ||
fae6e246 RH |
11666 | /* Disable access control as this function is used only during |
11667 | name-mangling. */ | |
11668 | save_access_control = flag_access_control; | |
11669 | flag_access_control = 0; | |
5c74d5b0 | 11670 | |
9579624e | 11671 | ++processing_template_decl; |
1f6e1acc AS |
11672 | /* Now, do the (partial) substitution to figure out the |
11673 | appropriate function type. */ | |
c2ea3a40 | 11674 | fn_type = tsubst (fn_type, partial_args, tf_error, NULL_TREE); |
9579624e | 11675 | --processing_template_decl; |
1f6e1acc AS |
11676 | |
11677 | /* Substitute into the template parameters to obtain the real | |
11678 | innermost set of parameters. This step is important if the | |
11679 | innermost set of template parameters contains value | |
11680 | parameters whose types depend on outer template parameters. */ | |
11681 | TREE_VEC_LENGTH (partial_args)--; | |
c2ea3a40 | 11682 | tparms = tsubst_template_parms (tparms, partial_args, tf_error); |
1f6e1acc | 11683 | |
fae6e246 | 11684 | flag_access_control = save_access_control; |
5c74d5b0 | 11685 | } |
1f6e1acc AS |
11686 | |
11687 | return fn_type; | |
11688 | } | |
669ec2b4 | 11689 | |
cb753e49 | 11690 | /* Return truthvalue if we're processing a template different from |
dc957d14 | 11691 | the last one involved in diagnostics. */ |
cb753e49 | 11692 | int |
3a978d72 | 11693 | problematic_instantiation_changed (void) |
cb753e49 GDR |
11694 | { |
11695 | return last_template_error_tick != tinst_level_tick; | |
11696 | } | |
11697 | ||
11698 | /* Remember current template involved in diagnostics. */ | |
11699 | void | |
3a978d72 | 11700 | record_last_problematic_instantiation (void) |
cb753e49 GDR |
11701 | { |
11702 | last_template_error_tick = tinst_level_tick; | |
11703 | } | |
11704 | ||
11705 | tree | |
3a978d72 | 11706 | current_instantiation (void) |
cb753e49 GDR |
11707 | { |
11708 | return current_tinst_level; | |
11709 | } | |
db3f4e4e NS |
11710 | |
11711 | /* [temp.param] Check that template non-type parm TYPE is of an allowable | |
838dfd8a | 11712 | type. Return zero for ok, nonzero for disallowed. Issue error and |
c2ea3a40 | 11713 | warning messages under control of COMPLAIN. */ |
db3f4e4e NS |
11714 | |
11715 | static int | |
3a978d72 | 11716 | invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain) |
db3f4e4e NS |
11717 | { |
11718 | if (INTEGRAL_TYPE_P (type)) | |
11719 | return 0; | |
11720 | else if (POINTER_TYPE_P (type)) | |
11721 | return 0; | |
a5ac359a | 11722 | else if (TYPE_PTR_TO_MEMBER_P (type)) |
db3f4e4e | 11723 | return 0; |
db3f4e4e NS |
11724 | else if (TREE_CODE (type) == TEMPLATE_TYPE_PARM) |
11725 | return 0; | |
11726 | else if (TREE_CODE (type) == TYPENAME_TYPE) | |
11727 | return 0; | |
11728 | ||
c2ea3a40 | 11729 | if (complain & tf_error) |
0f51ccfc | 11730 | error ("%q#T is not a valid type for a template constant parameter", type); |
db3f4e4e NS |
11731 | return 1; |
11732 | } | |
e2500fed | 11733 | |
5552b43c MM |
11734 | /* Returns TRUE if TYPE is dependent, in the sense of [temp.dep.type]. |
11735 | Assumes that TYPE really is a type, and not the ERROR_MARK_NODE.*/ | |
1fb3244a | 11736 | |
5552b43c MM |
11737 | static bool |
11738 | dependent_type_p_r (tree type) | |
1fb3244a MM |
11739 | { |
11740 | tree scope; | |
11741 | ||
1fb3244a MM |
11742 | /* [temp.dep.type] |
11743 | ||
11744 | A type is dependent if it is: | |
11745 | ||
6615c446 JO |
11746 | -- a template parameter. Template template parameters are types |
11747 | for us (since TYPE_P holds true for them) so we handle | |
11748 | them here. */ | |
6bf92cb6 GB |
11749 | if (TREE_CODE (type) == TEMPLATE_TYPE_PARM |
11750 | || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM) | |
1fb3244a MM |
11751 | return true; |
11752 | /* -- a qualified-id with a nested-name-specifier which contains a | |
11753 | class-name that names a dependent type or whose unqualified-id | |
11754 | names a dependent type. */ | |
11755 | if (TREE_CODE (type) == TYPENAME_TYPE) | |
11756 | return true; | |
11757 | /* -- a cv-qualified type where the cv-unqualified type is | |
11758 | dependent. */ | |
11759 | type = TYPE_MAIN_VARIANT (type); | |
11760 | /* -- a compound type constructed from any dependent type. */ | |
a5ac359a | 11761 | if (TYPE_PTR_TO_MEMBER_P (type)) |
1fb3244a MM |
11762 | return (dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type)) |
11763 | || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE | |
11764 | (type))); | |
11765 | else if (TREE_CODE (type) == POINTER_TYPE | |
11766 | || TREE_CODE (type) == REFERENCE_TYPE) | |
11767 | return dependent_type_p (TREE_TYPE (type)); | |
11768 | else if (TREE_CODE (type) == FUNCTION_TYPE | |
11769 | || TREE_CODE (type) == METHOD_TYPE) | |
11770 | { | |
11771 | tree arg_type; | |
11772 | ||
11773 | if (dependent_type_p (TREE_TYPE (type))) | |
11774 | return true; | |
11775 | for (arg_type = TYPE_ARG_TYPES (type); | |
11776 | arg_type; | |
11777 | arg_type = TREE_CHAIN (arg_type)) | |
11778 | if (dependent_type_p (TREE_VALUE (arg_type))) | |
11779 | return true; | |
11780 | return false; | |
11781 | } | |
11782 | /* -- an array type constructed from any dependent type or whose | |
11783 | size is specified by a constant expression that is | |
11784 | value-dependent. */ | |
11785 | if (TREE_CODE (type) == ARRAY_TYPE) | |
11786 | { | |
11787 | if (TYPE_DOMAIN (type) | |
11788 | && ((value_dependent_expression_p | |
11789 | (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
11790 | || (type_dependent_expression_p | |
11791 | (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))))) | |
11792 | return true; | |
11793 | return dependent_type_p (TREE_TYPE (type)); | |
11794 | } | |
86306a6b | 11795 | |
1fb3244a | 11796 | /* -- a template-id in which either the template name is a template |
86306a6b NS |
11797 | parameter ... */ |
11798 | if (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
1fb3244a | 11799 | return true; |
86306a6b | 11800 | /* ... or any of the template arguments is a dependent type or |
04c06002 | 11801 | an expression that is type-dependent or value-dependent. */ |
86306a6b | 11802 | else if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INFO (type) |
7e99327d MM |
11803 | && (any_dependent_template_arguments_p |
11804 | (INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type))))) | |
1fb3244a | 11805 | return true; |
86306a6b | 11806 | |
1fb3244a MM |
11807 | /* All TYPEOF_TYPEs are dependent; if the argument of the `typeof' |
11808 | expression is not type-dependent, then it should already been | |
11809 | have resolved. */ | |
11810 | if (TREE_CODE (type) == TYPEOF_TYPE) | |
11811 | return true; | |
86306a6b | 11812 | |
1fb3244a MM |
11813 | /* The standard does not specifically mention types that are local |
11814 | to template functions or local classes, but they should be | |
11815 | considered dependent too. For example: | |
11816 | ||
11817 | template <int I> void f() { | |
11818 | enum E { a = I }; | |
11819 | S<sizeof (E)> s; | |
11820 | } | |
11821 | ||
11822 | The size of `E' cannot be known until the value of `I' has been | |
11823 | determined. Therefore, `E' must be considered dependent. */ | |
11824 | scope = TYPE_CONTEXT (type); | |
11825 | if (scope && TYPE_P (scope)) | |
11826 | return dependent_type_p (scope); | |
11827 | else if (scope && TREE_CODE (scope) == FUNCTION_DECL) | |
11828 | return type_dependent_expression_p (scope); | |
11829 | ||
11830 | /* Other types are non-dependent. */ | |
11831 | return false; | |
11832 | } | |
11833 | ||
5552b43c MM |
11834 | /* Returns TRUE if TYPE is dependent, in the sense of |
11835 | [temp.dep.type]. */ | |
11836 | ||
11837 | bool | |
11838 | dependent_type_p (tree type) | |
11839 | { | |
11840 | /* If there are no template parameters in scope, then there can't be | |
11841 | any dependent types. */ | |
11842 | if (!processing_template_decl) | |
11843 | return false; | |
11844 | ||
11845 | /* If the type is NULL, we have not computed a type for the entity | |
11846 | in question; in that case, the type is dependent. */ | |
11847 | if (!type) | |
11848 | return true; | |
11849 | ||
11850 | /* Erroneous types can be considered non-dependent. */ | |
11851 | if (type == error_mark_node) | |
11852 | return false; | |
11853 | ||
11854 | /* If we have not already computed the appropriate value for TYPE, | |
11855 | do so now. */ | |
11856 | if (!TYPE_DEPENDENT_P_VALID (type)) | |
11857 | { | |
11858 | TYPE_DEPENDENT_P (type) = dependent_type_p_r (type); | |
11859 | TYPE_DEPENDENT_P_VALID (type) = 1; | |
11860 | } | |
11861 | ||
11862 | return TYPE_DEPENDENT_P (type); | |
11863 | } | |
11864 | ||
8d83f792 MM |
11865 | /* Returns TRUE if EXPRESSION is dependent, according to CRITERION. */ |
11866 | ||
11867 | static bool | |
11868 | dependent_scope_ref_p (tree expression, bool criterion (tree)) | |
11869 | { | |
11870 | tree scope; | |
11871 | tree name; | |
11872 | ||
50bc768d | 11873 | gcc_assert (TREE_CODE (expression) == SCOPE_REF); |
8d83f792 MM |
11874 | |
11875 | if (!TYPE_P (TREE_OPERAND (expression, 0))) | |
11876 | return true; | |
11877 | ||
11878 | scope = TREE_OPERAND (expression, 0); | |
11879 | name = TREE_OPERAND (expression, 1); | |
11880 | ||
11881 | /* [temp.dep.expr] | |
11882 | ||
11883 | An id-expression is type-dependent if it contains a | |
11884 | nested-name-specifier that contains a class-name that names a | |
11885 | dependent type. */ | |
11886 | /* The suggested resolution to Core Issue 2 implies that if the | |
11887 | qualifying type is the current class, then we must peek | |
11888 | inside it. */ | |
11889 | if (DECL_P (name) | |
11890 | && currently_open_class (scope) | |
11891 | && !criterion (name)) | |
11892 | return false; | |
11893 | if (dependent_type_p (scope)) | |
11894 | return true; | |
11895 | ||
11896 | return false; | |
11897 | } | |
11898 | ||
20929c7f GB |
11899 | /* Returns TRUE if the EXPRESSION is value-dependent, in the sense of |
11900 | [temp.dep.constexpr] */ | |
1fb3244a | 11901 | |
14d22dd6 | 11902 | bool |
1fb3244a MM |
11903 | value_dependent_expression_p (tree expression) |
11904 | { | |
11905 | if (!processing_template_decl) | |
11906 | return false; | |
11907 | ||
11908 | /* A name declared with a dependent type. */ | |
10b1d5e7 | 11909 | if (TREE_CODE (expression) == IDENTIFIER_NODE |
00cf3e31 MM |
11910 | || (DECL_P (expression) |
11911 | && type_dependent_expression_p (expression))) | |
1fb3244a MM |
11912 | return true; |
11913 | /* A non-type template parameter. */ | |
11914 | if ((TREE_CODE (expression) == CONST_DECL | |
11915 | && DECL_TEMPLATE_PARM_P (expression)) | |
11916 | || TREE_CODE (expression) == TEMPLATE_PARM_INDEX) | |
11917 | return true; | |
11918 | /* A constant with integral or enumeration type and is initialized | |
11919 | with an expression that is value-dependent. */ | |
11920 | if (TREE_CODE (expression) == VAR_DECL | |
11921 | && DECL_INITIAL (expression) | |
d17811fd | 11922 | && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (expression)) |
1fb3244a MM |
11923 | && value_dependent_expression_p (DECL_INITIAL (expression))) |
11924 | return true; | |
11925 | /* These expressions are value-dependent if the type to which the | |
20929c7f GB |
11926 | cast occurs is dependent or the expression being casted is |
11927 | value-dependent. */ | |
d17811fd MM |
11928 | if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR |
11929 | || TREE_CODE (expression) == STATIC_CAST_EXPR | |
11930 | || TREE_CODE (expression) == CONST_CAST_EXPR | |
11931 | || TREE_CODE (expression) == REINTERPRET_CAST_EXPR | |
11932 | || TREE_CODE (expression) == CAST_EXPR) | |
11933 | { | |
d36d5600 GB |
11934 | tree type = TREE_TYPE (expression); |
11935 | if (dependent_type_p (type)) | |
d17811fd MM |
11936 | return true; |
11937 | /* A functional cast has a list of operands. */ | |
11938 | expression = TREE_OPERAND (expression, 0); | |
d36d5600 GB |
11939 | if (!expression) |
11940 | { | |
11941 | /* If there are no operands, it must be an expression such | |
11942 | as "int()". This should not happen for aggregate types | |
11943 | because it would form non-constant expressions. */ | |
50bc768d | 11944 | gcc_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type)); |
d36d5600 GB |
11945 | |
11946 | return false; | |
11947 | } | |
d17811fd MM |
11948 | if (TREE_CODE (expression) == TREE_LIST) |
11949 | { | |
11950 | do | |
11951 | { | |
11952 | if (value_dependent_expression_p (TREE_VALUE (expression))) | |
11953 | return true; | |
11954 | expression = TREE_CHAIN (expression); | |
11955 | } | |
11956 | while (expression); | |
11957 | return false; | |
11958 | } | |
11959 | else | |
11960 | return value_dependent_expression_p (expression); | |
11961 | } | |
11962 | /* A `sizeof' expression is value-dependent if the operand is | |
11963 | type-dependent. */ | |
11964 | if (TREE_CODE (expression) == SIZEOF_EXPR | |
11965 | || TREE_CODE (expression) == ALIGNOF_EXPR) | |
11966 | { | |
11967 | expression = TREE_OPERAND (expression, 0); | |
11968 | if (TYPE_P (expression)) | |
11969 | return dependent_type_p (expression); | |
11970 | return type_dependent_expression_p (expression); | |
11971 | } | |
8d83f792 MM |
11972 | if (TREE_CODE (expression) == SCOPE_REF) |
11973 | return dependent_scope_ref_p (expression, value_dependent_expression_p); | |
3d5ddced GB |
11974 | if (TREE_CODE (expression) == COMPONENT_REF) |
11975 | return (value_dependent_expression_p (TREE_OPERAND (expression, 0)) | |
11976 | || value_dependent_expression_p (TREE_OPERAND (expression, 1))); | |
100d337a MA |
11977 | |
11978 | /* A CALL_EXPR is value-dependent if any argument is | |
11979 | value-dependent. Why do we have to handle CALL_EXPRs in this | |
11980 | function at all? First, some function calls, those for which | |
11981 | value_dependent_expression_p is true, man appear in constant | |
11982 | expressions. Second, there appear to be bugs which result in | |
11983 | other CALL_EXPRs reaching this point. */ | |
11984 | if (TREE_CODE (expression) == CALL_EXPR) | |
11985 | { | |
11986 | tree function = TREE_OPERAND (expression, 0); | |
11987 | tree args = TREE_OPERAND (expression, 1); | |
11988 | ||
11989 | if (value_dependent_expression_p (function)) | |
11990 | return true; | |
11991 | else if (! args) | |
11992 | return false; | |
11993 | else if (TREE_CODE (args) == TREE_LIST) | |
11994 | { | |
11995 | do | |
11996 | { | |
11997 | if (value_dependent_expression_p (TREE_VALUE (args))) | |
11998 | return true; | |
11999 | args = TREE_CHAIN (args); | |
12000 | } | |
12001 | while (args); | |
12002 | return false; | |
12003 | } | |
12004 | else | |
12005 | return value_dependent_expression_p (args); | |
12006 | } | |
1fb3244a MM |
12007 | /* A constant expression is value-dependent if any subexpression is |
12008 | value-dependent. */ | |
6615c446 | 12009 | if (EXPR_P (expression)) |
1fb3244a MM |
12010 | { |
12011 | switch (TREE_CODE_CLASS (TREE_CODE (expression))) | |
12012 | { | |
6615c446 | 12013 | case tcc_unary: |
1fb3244a MM |
12014 | return (value_dependent_expression_p |
12015 | (TREE_OPERAND (expression, 0))); | |
6615c446 JO |
12016 | case tcc_comparison: |
12017 | case tcc_binary: | |
1fb3244a MM |
12018 | return ((value_dependent_expression_p |
12019 | (TREE_OPERAND (expression, 0))) | |
12020 | || (value_dependent_expression_p | |
12021 | (TREE_OPERAND (expression, 1)))); | |
6615c446 | 12022 | case tcc_expression: |
1fb3244a MM |
12023 | { |
12024 | int i; | |
54e4aedb | 12025 | for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (expression)); ++i) |
14d22dd6 MM |
12026 | /* In some cases, some of the operands may be missing. |
12027 | (For example, in the case of PREDECREMENT_EXPR, the | |
12028 | amount to increment by may be missing.) That doesn't | |
12029 | make the expression dependent. */ | |
12030 | if (TREE_OPERAND (expression, i) | |
12031 | && (value_dependent_expression_p | |
12032 | (TREE_OPERAND (expression, i)))) | |
1fb3244a MM |
12033 | return true; |
12034 | return false; | |
12035 | } | |
6615c446 JO |
12036 | case tcc_reference: |
12037 | case tcc_statement: | |
12038 | /* These cannot be value dependent. */ | |
12039 | return false; | |
12040 | ||
12041 | default: | |
12042 | gcc_unreachable (); | |
1fb3244a MM |
12043 | } |
12044 | } | |
12045 | ||
12046 | /* The expression is not value-dependent. */ | |
12047 | return false; | |
12048 | } | |
12049 | ||
12050 | /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of | |
12051 | [temp.dep.expr]. */ | |
12052 | ||
12053 | bool | |
3a978d72 | 12054 | type_dependent_expression_p (tree expression) |
1fb3244a MM |
12055 | { |
12056 | if (!processing_template_decl) | |
12057 | return false; | |
12058 | ||
7efa3e22 NS |
12059 | if (expression == error_mark_node) |
12060 | return false; | |
10b1d5e7 MM |
12061 | |
12062 | /* An unresolved name is always dependent. */ | |
12063 | if (TREE_CODE (expression) == IDENTIFIER_NODE) | |
12064 | return true; | |
7efa3e22 | 12065 | |
1fb3244a MM |
12066 | /* Some expression forms are never type-dependent. */ |
12067 | if (TREE_CODE (expression) == PSEUDO_DTOR_EXPR | |
12068 | || TREE_CODE (expression) == SIZEOF_EXPR | |
12069 | || TREE_CODE (expression) == ALIGNOF_EXPR | |
12070 | || TREE_CODE (expression) == TYPEID_EXPR | |
12071 | || TREE_CODE (expression) == DELETE_EXPR | |
12072 | || TREE_CODE (expression) == VEC_DELETE_EXPR | |
12073 | || TREE_CODE (expression) == THROW_EXPR) | |
12074 | return false; | |
12075 | ||
12076 | /* The types of these expressions depends only on the type to which | |
12077 | the cast occurs. */ | |
12078 | if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR | |
12079 | || TREE_CODE (expression) == STATIC_CAST_EXPR | |
12080 | || TREE_CODE (expression) == CONST_CAST_EXPR | |
12081 | || TREE_CODE (expression) == REINTERPRET_CAST_EXPR | |
12082 | || TREE_CODE (expression) == CAST_EXPR) | |
12083 | return dependent_type_p (TREE_TYPE (expression)); | |
d17811fd | 12084 | |
1fb3244a MM |
12085 | /* The types of these expressions depends only on the type created |
12086 | by the expression. */ | |
d17811fd MM |
12087 | if (TREE_CODE (expression) == NEW_EXPR |
12088 | || TREE_CODE (expression) == VEC_NEW_EXPR) | |
09d2f85f KL |
12089 | { |
12090 | /* For NEW_EXPR tree nodes created inside a template, either | |
12091 | the object type itself or a TREE_LIST may appear as the | |
12092 | operand 1. */ | |
12093 | tree type = TREE_OPERAND (expression, 1); | |
12094 | if (TREE_CODE (type) == TREE_LIST) | |
12095 | /* This is an array type. We need to check array dimensions | |
12096 | as well. */ | |
12097 | return dependent_type_p (TREE_VALUE (TREE_PURPOSE (type))) | |
12098 | || value_dependent_expression_p | |
12099 | (TREE_OPERAND (TREE_VALUE (type), 1)); | |
12100 | else | |
12101 | return dependent_type_p (type); | |
12102 | } | |
1fb3244a | 12103 | |
5a57f1b2 JM |
12104 | if (TREE_CODE (expression) == SCOPE_REF |
12105 | && dependent_scope_ref_p (expression, | |
12106 | type_dependent_expression_p)) | |
12107 | return true; | |
12108 | ||
12109 | if (TREE_CODE (expression) == FUNCTION_DECL | |
12110 | && DECL_LANG_SPECIFIC (expression) | |
12111 | && DECL_TEMPLATE_INFO (expression) | |
12112 | && (any_dependent_template_arguments_p | |
12113 | (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression))))) | |
12114 | return true; | |
12115 | ||
12116 | if (TREE_CODE (expression) == TEMPLATE_DECL | |
12117 | && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression)) | |
12118 | return false; | |
12119 | ||
d17811fd MM |
12120 | if (TREE_TYPE (expression) == unknown_type_node) |
12121 | { | |
12122 | if (TREE_CODE (expression) == ADDR_EXPR) | |
12123 | return type_dependent_expression_p (TREE_OPERAND (expression, 0)); | |
c353b8e3 MM |
12124 | if (TREE_CODE (expression) == COMPONENT_REF |
12125 | || TREE_CODE (expression) == OFFSET_REF) | |
6cb89308 NS |
12126 | { |
12127 | if (type_dependent_expression_p (TREE_OPERAND (expression, 0))) | |
12128 | return true; | |
12129 | expression = TREE_OPERAND (expression, 1); | |
12130 | if (TREE_CODE (expression) == IDENTIFIER_NODE) | |
12131 | return false; | |
12132 | } | |
3601f003 KL |
12133 | /* SCOPE_REF with non-null TREE_TYPE is always non-dependent. */ |
12134 | if (TREE_CODE (expression) == SCOPE_REF) | |
12135 | return false; | |
5a57f1b2 | 12136 | |
d17811fd MM |
12137 | if (TREE_CODE (expression) == BASELINK) |
12138 | expression = BASELINK_FUNCTIONS (expression); | |
315fb5db | 12139 | |
d17811fd MM |
12140 | if (TREE_CODE (expression) == TEMPLATE_ID_EXPR) |
12141 | { | |
ee3071ef NS |
12142 | if (any_dependent_template_arguments_p |
12143 | (TREE_OPERAND (expression, 1))) | |
d17811fd MM |
12144 | return true; |
12145 | expression = TREE_OPERAND (expression, 0); | |
12146 | } | |
315fb5db NS |
12147 | gcc_assert (TREE_CODE (expression) == OVERLOAD); |
12148 | ||
12149 | while (expression) | |
d17811fd | 12150 | { |
315fb5db NS |
12151 | if (type_dependent_expression_p (OVL_CURRENT (expression))) |
12152 | return true; | |
12153 | expression = OVL_NEXT (expression); | |
d17811fd | 12154 | } |
315fb5db | 12155 | return false; |
d17811fd MM |
12156 | } |
12157 | ||
1fb3244a MM |
12158 | return (dependent_type_p (TREE_TYPE (expression))); |
12159 | } | |
12160 | ||
d17811fd MM |
12161 | /* Returns TRUE if ARGS (a TREE_LIST of arguments to a function call) |
12162 | contains a type-dependent expression. */ | |
1fb3244a MM |
12163 | |
12164 | bool | |
d17811fd MM |
12165 | any_type_dependent_arguments_p (tree args) |
12166 | { | |
12167 | while (args) | |
12168 | { | |
7efa3e22 NS |
12169 | tree arg = TREE_VALUE (args); |
12170 | ||
12171 | if (type_dependent_expression_p (arg)) | |
d17811fd MM |
12172 | return true; |
12173 | args = TREE_CHAIN (args); | |
12174 | } | |
12175 | return false; | |
12176 | } | |
12177 | ||
12178 | /* Returns TRUE if the ARG (a template argument) is dependent. */ | |
12179 | ||
12180 | static bool | |
1fb3244a MM |
12181 | dependent_template_arg_p (tree arg) |
12182 | { | |
12183 | if (!processing_template_decl) | |
12184 | return false; | |
12185 | ||
12186 | if (TREE_CODE (arg) == TEMPLATE_DECL | |
12187 | || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
12188 | return dependent_template_p (arg); | |
12189 | else if (TYPE_P (arg)) | |
12190 | return dependent_type_p (arg); | |
12191 | else | |
12192 | return (type_dependent_expression_p (arg) | |
12193 | || value_dependent_expression_p (arg)); | |
12194 | } | |
12195 | ||
d17811fd MM |
12196 | /* Returns true if ARGS (a collection of template arguments) contains |
12197 | any dependent arguments. */ | |
1fb3244a | 12198 | |
d17811fd MM |
12199 | bool |
12200 | any_dependent_template_arguments_p (tree args) | |
1fb3244a | 12201 | { |
bf12d54d | 12202 | int i; |
c353b8e3 MM |
12203 | int j; |
12204 | ||
d17811fd MM |
12205 | if (!args) |
12206 | return false; | |
12207 | ||
c353b8e3 MM |
12208 | for (i = 0; i < TMPL_ARGS_DEPTH (args); ++i) |
12209 | { | |
12210 | tree level = TMPL_ARGS_LEVEL (args, i + 1); | |
12211 | for (j = 0; j < TREE_VEC_LENGTH (level); ++j) | |
12212 | if (dependent_template_arg_p (TREE_VEC_ELT (level, j))) | |
12213 | return true; | |
12214 | } | |
1fb3244a | 12215 | |
1fb3244a MM |
12216 | return false; |
12217 | } | |
12218 | ||
12219 | /* Returns TRUE if the template TMPL is dependent. */ | |
12220 | ||
12221 | bool | |
12222 | dependent_template_p (tree tmpl) | |
12223 | { | |
b95cc51a MM |
12224 | if (TREE_CODE (tmpl) == OVERLOAD) |
12225 | { | |
12226 | while (tmpl) | |
12227 | { | |
12228 | if (dependent_template_p (OVL_FUNCTION (tmpl))) | |
12229 | return true; | |
12230 | tmpl = OVL_CHAIN (tmpl); | |
12231 | } | |
12232 | return false; | |
12233 | } | |
12234 | ||
1fb3244a MM |
12235 | /* Template template parameters are dependent. */ |
12236 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl) | |
12237 | || TREE_CODE (tmpl) == TEMPLATE_TEMPLATE_PARM) | |
12238 | return true; | |
27ab0504 | 12239 | /* So are names that have not been looked up. */ |
acccf788 MM |
12240 | if (TREE_CODE (tmpl) == SCOPE_REF |
12241 | || TREE_CODE (tmpl) == IDENTIFIER_NODE) | |
d17811fd | 12242 | return true; |
1fb3244a MM |
12243 | /* So are member templates of dependent classes. */ |
12244 | if (TYPE_P (CP_DECL_CONTEXT (tmpl))) | |
12245 | return dependent_type_p (DECL_CONTEXT (tmpl)); | |
12246 | return false; | |
12247 | } | |
12248 | ||
d17811fd MM |
12249 | /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */ |
12250 | ||
12251 | bool | |
12252 | dependent_template_id_p (tree tmpl, tree args) | |
12253 | { | |
12254 | return (dependent_template_p (tmpl) | |
12255 | || any_dependent_template_arguments_p (args)); | |
12256 | } | |
12257 | ||
14d22dd6 MM |
12258 | /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the |
12259 | TYPENAME_TYPE corresponds. Returns ERROR_MARK_NODE if no such TYPE | |
12260 | can be found. Note that this function peers inside uninstantiated | |
12261 | templates and therefore should be used only in extremely limited | |
12262 | situations. */ | |
12263 | ||
12264 | tree | |
12265 | resolve_typename_type (tree type, bool only_current_p) | |
12266 | { | |
12267 | tree scope; | |
12268 | tree name; | |
12269 | tree decl; | |
12270 | int quals; | |
4514aa8c | 12271 | tree pushed_scope; |
14d22dd6 | 12272 | |
50bc768d | 12273 | gcc_assert (TREE_CODE (type) == TYPENAME_TYPE); |
14d22dd6 MM |
12274 | |
12275 | scope = TYPE_CONTEXT (type); | |
12276 | name = TYPE_IDENTIFIER (type); | |
12277 | ||
12278 | /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve | |
12279 | it first before we can figure out what NAME refers to. */ | |
12280 | if (TREE_CODE (scope) == TYPENAME_TYPE) | |
12281 | scope = resolve_typename_type (scope, only_current_p); | |
12282 | /* If we don't know what SCOPE refers to, then we cannot resolve the | |
12283 | TYPENAME_TYPE. */ | |
12284 | if (scope == error_mark_node || TREE_CODE (scope) == TYPENAME_TYPE) | |
12285 | return error_mark_node; | |
12286 | /* If the SCOPE is a template type parameter, we have no way of | |
12287 | resolving the name. */ | |
12288 | if (TREE_CODE (scope) == TEMPLATE_TYPE_PARM) | |
12289 | return type; | |
12290 | /* If the SCOPE is not the current instantiation, there's no reason | |
12291 | to look inside it. */ | |
12292 | if (only_current_p && !currently_open_class (scope)) | |
12293 | return error_mark_node; | |
ca099ac8 MM |
12294 | /* If SCOPE is a partial instantiation, it will not have a valid |
12295 | TYPE_FIELDS list, so use the original template. */ | |
353b4fc0 | 12296 | scope = CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope); |
14d22dd6 MM |
12297 | /* Enter the SCOPE so that name lookup will be resolved as if we |
12298 | were in the class definition. In particular, SCOPE will no | |
12299 | longer be considered a dependent type. */ | |
4514aa8c | 12300 | pushed_scope = push_scope (scope); |
14d22dd6 | 12301 | /* Look up the declaration. */ |
86ac0575 | 12302 | decl = lookup_member (scope, name, /*protect=*/0, /*want_type=*/true); |
14d22dd6 MM |
12303 | /* Obtain the set of qualifiers applied to the TYPE. */ |
12304 | quals = cp_type_quals (type); | |
12305 | /* For a TYPENAME_TYPE like "typename X::template Y<T>", we want to | |
12306 | find a TEMPLATE_DECL. Otherwise, we want to find a TYPE_DECL. */ | |
12307 | if (!decl) | |
12308 | type = error_mark_node; | |
12309 | else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == IDENTIFIER_NODE | |
12310 | && TREE_CODE (decl) == TYPE_DECL) | |
12311 | type = TREE_TYPE (decl); | |
12312 | else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == TEMPLATE_ID_EXPR | |
12313 | && DECL_CLASS_TEMPLATE_P (decl)) | |
12314 | { | |
12315 | tree tmpl; | |
12316 | tree args; | |
12317 | /* Obtain the template and the arguments. */ | |
12318 | tmpl = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 0); | |
12319 | args = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 1); | |
12320 | /* Instantiate the template. */ | |
12321 | type = lookup_template_class (tmpl, args, NULL_TREE, NULL_TREE, | |
42eaed49 | 12322 | /*entering_scope=*/0, tf_error | tf_user); |
14d22dd6 MM |
12323 | } |
12324 | else | |
12325 | type = error_mark_node; | |
12326 | /* Qualify the resulting type. */ | |
12327 | if (type != error_mark_node && quals) | |
12328 | type = cp_build_qualified_type (type, quals); | |
12329 | /* Leave the SCOPE. */ | |
4514aa8c NS |
12330 | if (pushed_scope) |
12331 | pop_scope (pushed_scope); | |
14d22dd6 MM |
12332 | |
12333 | return type; | |
12334 | } | |
12335 | ||
d17811fd MM |
12336 | /* EXPR is an expression which is not type-dependent. Return a proxy |
12337 | for EXPR that can be used to compute the types of larger | |
12338 | expressions containing EXPR. */ | |
12339 | ||
12340 | tree | |
12341 | build_non_dependent_expr (tree expr) | |
12342 | { | |
0deb916c MM |
12343 | tree inner_expr; |
12344 | ||
d17811fd MM |
12345 | /* Preserve null pointer constants so that the type of things like |
12346 | "p == 0" where "p" is a pointer can be determined. */ | |
12347 | if (null_ptr_cst_p (expr)) | |
12348 | return expr; | |
12349 | /* Preserve OVERLOADs; the functions must be available to resolve | |
12350 | types. */ | |
0deb916c MM |
12351 | inner_expr = (TREE_CODE (expr) == ADDR_EXPR ? |
12352 | TREE_OPERAND (expr, 0) : expr); | |
12353 | if (TREE_CODE (inner_expr) == OVERLOAD | |
12354 | || TREE_CODE (inner_expr) == FUNCTION_DECL | |
12355 | || TREE_CODE (inner_expr) == TEMPLATE_DECL | |
12356 | || TREE_CODE (inner_expr) == TEMPLATE_ID_EXPR) | |
d17811fd | 12357 | return expr; |
5ae9ba3e MM |
12358 | /* There is no need to return a proxy for a variable. */ |
12359 | if (TREE_CODE (expr) == VAR_DECL) | |
12360 | return expr; | |
7433e6d4 MM |
12361 | /* Preserve string constants; conversions from string constants to |
12362 | "char *" are allowed, even though normally a "const char *" | |
12363 | cannot be used to initialize a "char *". */ | |
12364 | if (TREE_CODE (expr) == STRING_CST) | |
12365 | return expr; | |
b7c707d1 MM |
12366 | /* Preserve arithmetic constants, as an optimization -- there is no |
12367 | reason to create a new node. */ | |
12368 | if (TREE_CODE (expr) == INTEGER_CST || TREE_CODE (expr) == REAL_CST) | |
12369 | return expr; | |
9b7be7b5 MM |
12370 | /* Preserve THROW_EXPRs -- all throw-expressions have type "void". |
12371 | There is at least one place where we want to know that a | |
12372 | particular expression is a throw-expression: when checking a ?: | |
12373 | expression, there are special rules if the second or third | |
878cbb73 | 12374 | argument is a throw-expression. */ |
9b7be7b5 MM |
12375 | if (TREE_CODE (expr) == THROW_EXPR) |
12376 | return expr; | |
47d4c811 NS |
12377 | |
12378 | if (TREE_CODE (expr) == COND_EXPR) | |
f293ce4b RS |
12379 | return build3 (COND_EXPR, |
12380 | TREE_TYPE (expr), | |
12381 | TREE_OPERAND (expr, 0), | |
12382 | (TREE_OPERAND (expr, 1) | |
12383 | ? build_non_dependent_expr (TREE_OPERAND (expr, 1)) | |
12384 | : build_non_dependent_expr (TREE_OPERAND (expr, 0))), | |
12385 | build_non_dependent_expr (TREE_OPERAND (expr, 2))); | |
8e1daa34 NS |
12386 | if (TREE_CODE (expr) == COMPOUND_EXPR |
12387 | && !COMPOUND_EXPR_OVERLOADED (expr)) | |
f293ce4b RS |
12388 | return build2 (COMPOUND_EXPR, |
12389 | TREE_TYPE (expr), | |
12390 | TREE_OPERAND (expr, 0), | |
12391 | build_non_dependent_expr (TREE_OPERAND (expr, 1))); | |
47d4c811 | 12392 | |
d17811fd MM |
12393 | /* Otherwise, build a NON_DEPENDENT_EXPR. |
12394 | ||
12395 | REFERENCE_TYPEs are not stripped for expressions in templates | |
12396 | because doing so would play havoc with mangling. Consider, for | |
12397 | example: | |
12398 | ||
12399 | template <typename T> void f<T& g>() { g(); } | |
12400 | ||
12401 | In the body of "f", the expression for "g" will have | |
12402 | REFERENCE_TYPE, even though the standard says that it should | |
12403 | not. The reason is that we must preserve the syntactic form of | |
12404 | the expression so that mangling (say) "f<g>" inside the body of | |
12405 | "f" works out correctly. Therefore, the REFERENCE_TYPE is | |
12406 | stripped here. */ | |
018a5803 | 12407 | return build1 (NON_DEPENDENT_EXPR, non_reference (TREE_TYPE (expr)), expr); |
d17811fd MM |
12408 | } |
12409 | ||
12410 | /* ARGS is a TREE_LIST of expressions as arguments to a function call. | |
12411 | Return a new TREE_LIST with the various arguments replaced with | |
12412 | equivalent non-dependent expressions. */ | |
12413 | ||
12414 | tree | |
12415 | build_non_dependent_args (tree args) | |
12416 | { | |
12417 | tree a; | |
12418 | tree new_args; | |
12419 | ||
12420 | new_args = NULL_TREE; | |
12421 | for (a = args; a; a = TREE_CHAIN (a)) | |
12422 | new_args = tree_cons (NULL_TREE, | |
12423 | build_non_dependent_expr (TREE_VALUE (a)), | |
12424 | new_args); | |
12425 | return nreverse (new_args); | |
12426 | } | |
12427 | ||
e2500fed | 12428 | #include "gt-cp-pt.h" |