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8d08fdba | 1 | /* Handle parameterized types (templates) for GNU C++. |
06ceef4e RK |
2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
3 | 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 MS |
6 | |
7 | This file is part of GNU CC. | |
8 | ||
9 | GNU CC is free software; you can redistribute it and/or modify | |
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 | ||
14 | GNU CC is distributed in the hope that it will be useful, | |
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 | |
20 | along with GNU CC; 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" |
8d08fdba MS |
31 | #include "obstack.h" |
32 | ||
33 | #include "tree.h" | |
34 | #include "flags.h" | |
35 | #include "cp-tree.h" | |
36 | #include "decl.h" | |
37 | #include "parse.h" | |
f0e01782 | 38 | #include "lex.h" |
e8abc66f | 39 | #include "output.h" |
a9aedbc2 | 40 | #include "defaults.h" |
49c249e1 | 41 | #include "except.h" |
54f92bfb | 42 | #include "toplev.h" |
3dcaad8b | 43 | #include "rtl.h" |
091f9839 | 44 | #include "defaults.h" |
9cd64686 | 45 | #include "ggc.h" |
297a5329 | 46 | #include "timevar.h" |
49c249e1 | 47 | |
050367a3 MM |
48 | /* The type of functions taking a tree, and some additional data, and |
49 | returning an int. */ | |
158991b7 | 50 | typedef int (*tree_fn_t) PARAMS ((tree, void*)); |
050367a3 | 51 | |
8d08fdba | 52 | extern struct obstack permanent_obstack; |
8d08fdba | 53 | |
0aafb128 MM |
54 | /* The PENDING_TEMPLATES is a TREE_LIST of templates whose |
55 | instantiations have been deferred, either because their definitions | |
56 | were not yet available, or because we were putting off doing the | |
57 | work. The TREE_PURPOSE of each entry is a SRCLOC indicating where | |
58 | the instantiate request occurred; the TREE_VALUE is a either a DECL | |
59 | (for a function or static data member), or a TYPE (for a class) | |
60 | indicating what we are hoping to instantiate. */ | |
61 | static tree pending_templates; | |
5566b478 MS |
62 | static tree *template_tail = &pending_templates; |
63 | ||
0aafb128 | 64 | static tree maybe_templates; |
73aad9b9 JM |
65 | static tree *maybe_template_tail = &maybe_templates; |
66 | ||
67ffc812 | 67 | int processing_template_parmlist; |
386b8a85 JM |
68 | static int template_header_count; |
69 | ||
75650646 | 70 | static tree saved_trees; |
3dcaad8b MM |
71 | static varray_type inline_parm_levels; |
72 | static size_t inline_parm_levels_used; | |
75650646 | 73 | |
cb753e49 | 74 | static tree current_tinst_level; |
3ae18eaf | 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 | ||
8d08fdba MS |
81 | #define obstack_chunk_alloc xmalloc |
82 | #define obstack_chunk_free free | |
83 | ||
830bfa74 MM |
84 | #define UNIFY_ALLOW_NONE 0 |
85 | #define UNIFY_ALLOW_MORE_CV_QUAL 1 | |
86 | #define UNIFY_ALLOW_LESS_CV_QUAL 2 | |
87 | #define UNIFY_ALLOW_DERIVED 4 | |
161c12b0 | 88 | #define UNIFY_ALLOW_INTEGER 8 |
830bfa74 | 89 | |
4393e105 MM |
90 | #define GTB_VIA_VIRTUAL 1 /* The base class we are examining is |
91 | virtual, or a base class of a virtual | |
92 | base. */ | |
93 | #define GTB_IGNORE_TYPE 2 /* We don't need to try to unify the current | |
94 | type with the desired type. */ | |
95 | ||
158991b7 | 96 | static int resolve_overloaded_unification PARAMS ((tree, tree, tree, tree, |
4393e105 | 97 | unification_kind_t, int)); |
158991b7 | 98 | static int try_one_overload PARAMS ((tree, tree, tree, tree, tree, |
4393e105 | 99 | unification_kind_t, int)); |
158991b7 KG |
100 | static int unify PARAMS ((tree, tree, tree, tree, int)); |
101 | static void add_pending_template PARAMS ((tree)); | |
102 | static int push_tinst_level PARAMS ((tree)); | |
3ae18eaf | 103 | static void reopen_tinst_level PARAMS ((tree)); |
158991b7 | 104 | static tree classtype_mangled_name PARAMS ((tree)); |
63ad61ed | 105 | static char *mangle_class_name_for_template PARAMS ((const char *, tree, tree)); |
fd74ca0b | 106 | static tree tsubst_initializer_list PARAMS ((tree, tree)); |
158991b7 KG |
107 | static int list_eq PARAMS ((tree, tree)); |
108 | static tree get_class_bindings PARAMS ((tree, tree, tree)); | |
109 | static tree coerce_template_parms PARAMS ((tree, tree, tree, int, int)); | |
110 | static void tsubst_enum PARAMS ((tree, tree, tree)); | |
111 | static tree add_to_template_args PARAMS ((tree, tree)); | |
112 | static tree add_outermost_template_args PARAMS ((tree, tree)); | |
113 | static void maybe_adjust_types_for_deduction PARAMS ((unification_kind_t, tree*, | |
830bfa74 | 114 | tree*)); |
158991b7 | 115 | static int type_unification_real PARAMS ((tree, tree, tree, tree, |
e5214479 | 116 | int, unification_kind_t, int, int)); |
158991b7 KG |
117 | static void note_template_header PARAMS ((int)); |
118 | static tree maybe_fold_nontype_arg PARAMS ((tree)); | |
119 | static tree convert_nontype_argument PARAMS ((tree, tree)); | |
120 | static tree convert_template_argument PARAMS ((tree, tree, tree, int, | |
8b5b8b7c | 121 | int , tree)); |
158991b7 | 122 | static tree get_bindings_overload PARAMS ((tree, tree, tree)); |
e5214479 | 123 | static tree get_bindings_order PARAMS ((tree, tree, int)); |
158991b7 KG |
124 | static int for_each_template_parm PARAMS ((tree, tree_fn_t, void*)); |
125 | static tree build_template_parm_index PARAMS ((int, int, int, tree, tree)); | |
126 | static int inline_needs_template_parms PARAMS ((tree)); | |
127 | static void push_inline_template_parms_recursive PARAMS ((tree, int)); | |
128 | static tree retrieve_specialization PARAMS ((tree, tree)); | |
6dfbb909 | 129 | static tree retrieve_local_specialization PARAMS ((tree)); |
158991b7 | 130 | static tree register_specialization PARAMS ((tree, tree, tree)); |
414ea4aa | 131 | static void register_local_specialization PARAMS ((tree, tree)); |
158991b7 KG |
132 | static int unregister_specialization PARAMS ((tree, tree)); |
133 | static tree reduce_template_parm_level PARAMS ((tree, tree, int)); | |
134 | static tree build_template_decl PARAMS ((tree, tree)); | |
135 | static int mark_template_parm PARAMS ((tree, void *)); | |
136 | static tree tsubst_friend_function PARAMS ((tree, tree)); | |
137 | static tree tsubst_friend_class PARAMS ((tree, tree)); | |
e5214479 | 138 | static tree get_bindings_real PARAMS ((tree, tree, tree, int, int)); |
158991b7 KG |
139 | static int template_decl_level PARAMS ((tree)); |
140 | static tree maybe_get_template_decl_from_type_decl PARAMS ((tree)); | |
141 | static int check_cv_quals_for_unify PARAMS ((int, tree, tree)); | |
142 | static tree tsubst_template_arg_vector PARAMS ((tree, tree, int)); | |
143 | static tree tsubst_template_parms PARAMS ((tree, tree, int)); | |
144 | static void regenerate_decl_from_template PARAMS ((tree, tree)); | |
145 | static tree most_specialized PARAMS ((tree, tree, tree)); | |
146 | static tree most_specialized_class PARAMS ((tree, tree)); | |
669ec2b4 | 147 | static void set_mangled_name_for_template_decl PARAMS ((tree)); |
158991b7 KG |
148 | static int template_class_depth_real PARAMS ((tree, int)); |
149 | static tree tsubst_aggr_type PARAMS ((tree, tree, int, tree, int)); | |
150 | static tree tsubst_decl PARAMS ((tree, tree, tree, tree)); | |
151 | static tree tsubst_arg_types PARAMS ((tree, tree, int, tree)); | |
152 | static tree tsubst_function_type PARAMS ((tree, tree, int, tree)); | |
153 | static void check_specialization_scope PARAMS ((void)); | |
154 | static tree process_partial_specialization PARAMS ((tree)); | |
155 | static void set_current_access_from_decl PARAMS ((tree)); | |
156 | static void check_default_tmpl_args PARAMS ((tree, tree, int, int)); | |
157 | static tree tsubst_call_declarator_parms PARAMS ((tree, tree, int, tree)); | |
158 | static tree get_template_base_recursive PARAMS ((tree, tree, | |
4393e105 | 159 | tree, tree, tree, int)); |
158991b7 | 160 | static tree get_template_base PARAMS ((tree, tree, tree, tree)); |
74601d7c | 161 | static int verify_class_unification PARAMS ((tree, tree, tree)); |
158991b7 KG |
162 | static tree try_class_unification PARAMS ((tree, tree, tree, tree)); |
163 | static int coerce_template_template_parms PARAMS ((tree, tree, int, | |
4393e105 | 164 | tree, tree)); |
158991b7 KG |
165 | static tree determine_specialization PARAMS ((tree, tree, tree *, int)); |
166 | static int template_args_equal PARAMS ((tree, tree)); | |
158991b7 KG |
167 | static void tsubst_default_arguments PARAMS ((tree)); |
168 | static tree for_each_template_parm_r PARAMS ((tree *, int *, void *)); | |
db9b2174 | 169 | static tree instantiate_clone PARAMS ((tree, tree)); |
36a117a5 | 170 | |
9cd64686 MM |
171 | /* Called once to initialize pt.c. */ |
172 | ||
173 | void | |
174 | init_pt () | |
175 | { | |
176 | ggc_add_tree_root (&pending_templates, 1); | |
177 | ggc_add_tree_root (&maybe_templates, 1); | |
178 | ggc_add_tree_root (&saved_trees, 1); | |
3ae18eaf | 179 | ggc_add_tree_root (¤t_tinst_level, 1); |
9cd64686 MM |
180 | } |
181 | ||
e1467ff2 MM |
182 | /* Do any processing required when DECL (a member template declaration |
183 | using TEMPLATE_PARAMETERS as its innermost parameter list) is | |
184 | finished. Returns the TEMPLATE_DECL corresponding to DECL, unless | |
185 | it is a specialization, in which case the DECL itself is returned. */ | |
186 | ||
187 | tree | |
61a127b3 | 188 | finish_member_template_decl (decl) |
e1467ff2 MM |
189 | tree decl; |
190 | { | |
93cdc044 JM |
191 | if (decl == NULL_TREE || decl == void_type_node) |
192 | return NULL_TREE; | |
3ddfb0e6 MM |
193 | else if (decl == error_mark_node) |
194 | /* By returning NULL_TREE, the parser will just ignore this | |
195 | declaration. We have already issued the error. */ | |
196 | return NULL_TREE; | |
93cdc044 JM |
197 | else if (TREE_CODE (decl) == TREE_LIST) |
198 | { | |
5f311aec | 199 | /* Assume that the class is the only declspec. */ |
93cdc044 | 200 | decl = TREE_VALUE (decl); |
8d019cef | 201 | if (IS_AGGR_TYPE (decl) && CLASSTYPE_TEMPLATE_INFO (decl) |
370af2d5 | 202 | && ! CLASSTYPE_TEMPLATE_SPECIALIZATION (decl)) |
93cdc044 JM |
203 | { |
204 | tree tmpl = CLASSTYPE_TI_TEMPLATE (decl); | |
205 | check_member_template (tmpl); | |
206 | return tmpl; | |
207 | } | |
8d019cef | 208 | return NULL_TREE; |
93cdc044 | 209 | } |
07c88314 MM |
210 | else if (TREE_CODE (decl) == FIELD_DECL) |
211 | cp_error ("data member `%D' cannot be a member template", decl); | |
a1da6cba | 212 | else if (DECL_TEMPLATE_INFO (decl)) |
e1467ff2 | 213 | { |
a1da6cba MM |
214 | if (!DECL_TEMPLATE_SPECIALIZATION (decl)) |
215 | { | |
216 | check_member_template (DECL_TI_TEMPLATE (decl)); | |
217 | return DECL_TI_TEMPLATE (decl); | |
218 | } | |
219 | else | |
220 | return decl; | |
221 | } | |
222 | else | |
8251199e | 223 | cp_error ("invalid member template declaration `%D'", decl); |
e1467ff2 | 224 | |
a1da6cba | 225 | return error_mark_node; |
f84b4be9 | 226 | } |
e1467ff2 | 227 | |
f84b4be9 JM |
228 | /* Returns the template nesting level of the indicated class TYPE. |
229 | ||
230 | For example, in: | |
231 | template <class T> | |
232 | struct A | |
233 | { | |
234 | template <class U> | |
235 | struct B {}; | |
236 | }; | |
237 | ||
39c01e4c MM |
238 | A<T>::B<U> has depth two, while A<T> has depth one. |
239 | Both A<T>::B<int> and A<int>::B<U> have depth one, if | |
240 | COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not | |
241 | specializations. | |
242 | ||
243 | This function is guaranteed to return 0 if passed NULL_TREE so | |
244 | that, for example, `template_class_depth (current_class_type)' is | |
245 | always safe. */ | |
f84b4be9 | 246 | |
e9659ab0 | 247 | static int |
39c01e4c | 248 | template_class_depth_real (type, count_specializations) |
f84b4be9 | 249 | tree type; |
39c01e4c | 250 | int count_specializations; |
f84b4be9 | 251 | { |
93cdc044 | 252 | int depth; |
f84b4be9 | 253 | |
2c73f9f5 | 254 | for (depth = 0; |
ed44da02 MM |
255 | type && TREE_CODE (type) != NAMESPACE_DECL; |
256 | type = (TREE_CODE (type) == FUNCTION_DECL) | |
4f1c5b7d | 257 | ? CP_DECL_CONTEXT (type) : TYPE_CONTEXT (type)) |
ed44da02 MM |
258 | { |
259 | if (TREE_CODE (type) != FUNCTION_DECL) | |
260 | { | |
261 | if (CLASSTYPE_TEMPLATE_INFO (type) | |
262 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type)) | |
263 | && ((count_specializations | |
370af2d5 | 264 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (type)) |
ed44da02 MM |
265 | || uses_template_parms (CLASSTYPE_TI_ARGS (type)))) |
266 | ++depth; | |
267 | } | |
268 | else | |
269 | { | |
270 | if (DECL_TEMPLATE_INFO (type) | |
271 | && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type)) | |
272 | && ((count_specializations | |
273 | && DECL_TEMPLATE_SPECIALIZATION (type)) | |
274 | || uses_template_parms (DECL_TI_ARGS (type)))) | |
275 | ++depth; | |
276 | } | |
277 | } | |
f84b4be9 JM |
278 | |
279 | return depth; | |
e1467ff2 | 280 | } |
98c1c668 | 281 | |
39c01e4c MM |
282 | /* Returns the template nesting level of the indicated class TYPE. |
283 | Like template_class_depth_real, but instantiations do not count in | |
284 | the depth. */ | |
285 | ||
286 | int | |
287 | template_class_depth (type) | |
288 | tree type; | |
289 | { | |
290 | return template_class_depth_real (type, /*count_specializations=*/0); | |
291 | } | |
292 | ||
cae40af6 JM |
293 | /* Returns 1 if processing DECL as part of do_pending_inlines |
294 | needs us to push template parms. */ | |
295 | ||
296 | static int | |
297 | inline_needs_template_parms (decl) | |
298 | tree decl; | |
299 | { | |
300 | if (! DECL_TEMPLATE_INFO (decl)) | |
301 | return 0; | |
f84b4be9 | 302 | |
36a117a5 | 303 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl))) |
cae40af6 JM |
304 | > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl))); |
305 | } | |
306 | ||
307 | /* Subroutine of maybe_begin_member_template_processing. | |
308 | Push the template parms in PARMS, starting from LEVELS steps into the | |
309 | chain, and ending at the beginning, since template parms are listed | |
310 | innermost first. */ | |
311 | ||
312 | static void | |
313 | push_inline_template_parms_recursive (parmlist, levels) | |
314 | tree parmlist; | |
315 | int levels; | |
316 | { | |
317 | tree parms = TREE_VALUE (parmlist); | |
318 | int i; | |
319 | ||
320 | if (levels > 1) | |
321 | push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1); | |
786b5245 | 322 | |
98c1c668 | 323 | ++processing_template_decl; |
cae40af6 | 324 | current_template_parms |
98c1c668 JM |
325 | = tree_cons (build_int_2 (0, processing_template_decl), |
326 | parms, current_template_parms); | |
cae40af6 JM |
327 | TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1; |
328 | ||
786b5245 | 329 | pushlevel (0); |
98c1c668 JM |
330 | for (i = 0; i < TREE_VEC_LENGTH (parms); ++i) |
331 | { | |
786b5245 | 332 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
2f939d94 | 333 | my_friendly_assert (DECL_P (parm), 0); |
cae40af6 | 334 | |
98c1c668 JM |
335 | switch (TREE_CODE (parm)) |
336 | { | |
786b5245 | 337 | case TYPE_DECL: |
73b0fce8 | 338 | case TEMPLATE_DECL: |
98c1c668 JM |
339 | pushdecl (parm); |
340 | break; | |
786b5245 MM |
341 | |
342 | case PARM_DECL: | |
343 | { | |
fc03edb3 MM |
344 | /* Make a CONST_DECL as is done in process_template_parm. |
345 | It is ugly that we recreate this here; the original | |
346 | version built in process_template_parm is no longer | |
347 | available. */ | |
786b5245 MM |
348 | tree decl = build_decl (CONST_DECL, DECL_NAME (parm), |
349 | TREE_TYPE (parm)); | |
c727aa5e | 350 | DECL_ARTIFICIAL (decl) = 1; |
786b5245 | 351 | DECL_INITIAL (decl) = DECL_INITIAL (parm); |
cd9f6678 | 352 | SET_DECL_TEMPLATE_PARM_P (decl); |
786b5245 MM |
353 | pushdecl (decl); |
354 | } | |
cae40af6 | 355 | break; |
786b5245 | 356 | |
98c1c668 JM |
357 | default: |
358 | my_friendly_abort (0); | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
cae40af6 JM |
363 | /* Restore the template parameter context for a member template or |
364 | a friend template defined in a class definition. */ | |
365 | ||
366 | void | |
367 | maybe_begin_member_template_processing (decl) | |
368 | tree decl; | |
369 | { | |
370 | tree parms; | |
3dcaad8b | 371 | int levels = 0; |
cae40af6 | 372 | |
3dcaad8b MM |
373 | if (inline_needs_template_parms (decl)) |
374 | { | |
375 | parms = DECL_TEMPLATE_PARMS (most_general_template (decl)); | |
376 | levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl; | |
cae40af6 | 377 | |
3dcaad8b MM |
378 | if (DECL_TEMPLATE_SPECIALIZATION (decl)) |
379 | { | |
380 | --levels; | |
381 | parms = TREE_CHAIN (parms); | |
382 | } | |
cae40af6 | 383 | |
3dcaad8b | 384 | push_inline_template_parms_recursive (parms, levels); |
cae40af6 JM |
385 | } |
386 | ||
3dcaad8b MM |
387 | /* Remember how many levels of template parameters we pushed so that |
388 | we can pop them later. */ | |
389 | if (!inline_parm_levels) | |
390 | VARRAY_INT_INIT (inline_parm_levels, 4, "inline_parm_levels"); | |
391 | if (inline_parm_levels_used == inline_parm_levels->num_elements) | |
392 | VARRAY_GROW (inline_parm_levels, 2 * inline_parm_levels_used); | |
393 | VARRAY_INT (inline_parm_levels, inline_parm_levels_used) = levels; | |
394 | ++inline_parm_levels_used; | |
cae40af6 JM |
395 | } |
396 | ||
98c1c668 JM |
397 | /* Undo the effects of begin_member_template_processing. */ |
398 | ||
399 | void | |
b370501f | 400 | maybe_end_member_template_processing () |
98c1c668 | 401 | { |
3dcaad8b MM |
402 | int i; |
403 | ||
404 | if (!inline_parm_levels_used) | |
98c1c668 JM |
405 | return; |
406 | ||
3dcaad8b MM |
407 | --inline_parm_levels_used; |
408 | for (i = 0; | |
409 | i < VARRAY_INT (inline_parm_levels, inline_parm_levels_used); | |
410 | ++i) | |
cae40af6 JM |
411 | { |
412 | --processing_template_decl; | |
413 | current_template_parms = TREE_CHAIN (current_template_parms); | |
414 | poplevel (0, 0, 0); | |
415 | } | |
98c1c668 JM |
416 | } |
417 | ||
cae40af6 | 418 | /* Returns non-zero iff T is a member template function. We must be |
f84b4be9 | 419 | careful as in |
75650646 MM |
420 | |
421 | template <class T> class C { void f(); } | |
422 | ||
423 | Here, f is a template function, and a member, but not a member | |
424 | template. This function does not concern itself with the origin of | |
425 | T, only its present state. So if we have | |
426 | ||
427 | template <class T> class C { template <class U> void f(U); } | |
428 | ||
429 | then neither C<int>::f<char> nor C<T>::f<double> is considered | |
f181d4ae MM |
430 | to be a member template. But, `template <class U> void |
431 | C<int>::f(U)' is considered a member template. */ | |
98c1c668 | 432 | |
cae40af6 JM |
433 | int |
434 | is_member_template (t) | |
98c1c668 JM |
435 | tree t; |
436 | { | |
f181d4ae | 437 | if (!DECL_FUNCTION_TEMPLATE_P (t)) |
75650646 | 438 | /* Anything that isn't a function or a template function is |
aa5f3bad MM |
439 | certainly not a member template. */ |
440 | return 0; | |
441 | ||
cae40af6 | 442 | /* A local class can't have member templates. */ |
4f1c5b7d | 443 | if (decl_function_context (t)) |
cae40af6 JM |
444 | return 0; |
445 | ||
f181d4ae | 446 | return (DECL_FUNCTION_MEMBER_P (DECL_TEMPLATE_RESULT (t)) |
f84b4be9 JM |
447 | /* If there are more levels of template parameters than |
448 | there are template classes surrounding the declaration, | |
449 | then we have a member template. */ | |
f181d4ae | 450 | && (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
4f1c5b7d | 451 | template_class_depth (DECL_CONTEXT (t)))); |
f84b4be9 | 452 | } |
98c1c668 | 453 | |
ba4f4e5d | 454 | #if 0 /* UNUSED */ |
2ee4e084 MM |
455 | /* Returns non-zero iff T is a member template class. See |
456 | is_member_template for a description of what precisely constitutes | |
457 | a member template. */ | |
458 | ||
459 | int | |
460 | is_member_template_class (t) | |
461 | tree t; | |
462 | { | |
463 | if (!DECL_CLASS_TEMPLATE_P (t)) | |
464 | /* Anything that isn't a class template, is certainly not a member | |
465 | template. */ | |
466 | return 0; | |
467 | ||
468 | if (!DECL_CLASS_SCOPE_P (t)) | |
469 | /* Anything whose context isn't a class type is surely not a | |
470 | member template. */ | |
471 | return 0; | |
472 | ||
473 | /* If there are more levels of template parameters than there are | |
474 | template classes surrounding the declaration, then we have a | |
475 | member template. */ | |
36a117a5 | 476 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
2ee4e084 MM |
477 | template_class_depth (DECL_CONTEXT (t))); |
478 | } | |
ba4f4e5d | 479 | #endif |
2ee4e084 | 480 | |
36a117a5 | 481 | /* Return a new template argument vector which contains all of ARGS, |
f9a7ae04 | 482 | but has as its innermost set of arguments the EXTRA_ARGS. */ |
e6f1275f JM |
483 | |
484 | static tree | |
36a117a5 MM |
485 | add_to_template_args (args, extra_args) |
486 | tree args; | |
487 | tree extra_args; | |
e6f1275f | 488 | { |
36a117a5 MM |
489 | tree new_args; |
490 | int extra_depth; | |
491 | int i; | |
492 | int j; | |
e6f1275f | 493 | |
36a117a5 | 494 | extra_depth = TMPL_ARGS_DEPTH (extra_args); |
f31c0a32 | 495 | new_args = make_tree_vec (TMPL_ARGS_DEPTH (args) + extra_depth); |
e6f1275f | 496 | |
36a117a5 MM |
497 | for (i = 1; i <= TMPL_ARGS_DEPTH (args); ++i) |
498 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (args, i)); | |
e6f1275f | 499 | |
36a117a5 MM |
500 | for (j = 1; j <= extra_depth; ++j, ++i) |
501 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (extra_args, j)); | |
502 | ||
e6f1275f JM |
503 | return new_args; |
504 | } | |
505 | ||
36a117a5 MM |
506 | /* Like add_to_template_args, but only the outermost ARGS are added to |
507 | the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH | |
508 | (EXTRA_ARGS) levels are added. This function is used to combine | |
509 | the template arguments from a partial instantiation with the | |
510 | template arguments used to attain the full instantiation from the | |
511 | partial instantiation. */ | |
98c1c668 | 512 | |
4966381a | 513 | static tree |
36a117a5 | 514 | add_outermost_template_args (args, extra_args) |
98c1c668 JM |
515 | tree args; |
516 | tree extra_args; | |
517 | { | |
518 | tree new_args; | |
519 | ||
e4a84209 MM |
520 | /* If there are more levels of EXTRA_ARGS than there are ARGS, |
521 | something very fishy is going on. */ | |
522 | my_friendly_assert (TMPL_ARGS_DEPTH (args) >= TMPL_ARGS_DEPTH (extra_args), | |
523 | 0); | |
524 | ||
525 | /* If *all* the new arguments will be the EXTRA_ARGS, just return | |
526 | them. */ | |
527 | if (TMPL_ARGS_DEPTH (args) == TMPL_ARGS_DEPTH (extra_args)) | |
528 | return extra_args; | |
529 | ||
36a117a5 MM |
530 | /* For the moment, we make ARGS look like it contains fewer levels. */ |
531 | TREE_VEC_LENGTH (args) -= TMPL_ARGS_DEPTH (extra_args); | |
532 | ||
533 | new_args = add_to_template_args (args, extra_args); | |
98c1c668 | 534 | |
36a117a5 MM |
535 | /* Now, we restore ARGS to its full dimensions. */ |
536 | TREE_VEC_LENGTH (args) += TMPL_ARGS_DEPTH (extra_args); | |
98c1c668 JM |
537 | |
538 | return new_args; | |
539 | } | |
5566b478 | 540 | |
f9a7ae04 MM |
541 | /* Return the N levels of innermost template arguments from the ARGS. */ |
542 | ||
543 | tree | |
544 | get_innermost_template_args (args, n) | |
545 | tree args; | |
546 | int n; | |
547 | { | |
548 | tree new_args; | |
549 | int extra_levels; | |
550 | int i; | |
551 | ||
552 | my_friendly_assert (n >= 0, 20000603); | |
553 | ||
554 | /* If N is 1, just return the innermost set of template arguments. */ | |
555 | if (n == 1) | |
556 | return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args)); | |
557 | ||
558 | /* If we're not removing anything, just return the arguments we were | |
559 | given. */ | |
560 | extra_levels = TMPL_ARGS_DEPTH (args) - n; | |
561 | my_friendly_assert (extra_levels >= 0, 20000603); | |
562 | if (extra_levels == 0) | |
563 | return args; | |
564 | ||
565 | /* Make a new set of arguments, not containing the outer arguments. */ | |
566 | new_args = make_tree_vec (n); | |
567 | for (i = 1; i <= n; ++i) | |
568 | SET_TMPL_ARGS_LEVEL (new_args, i, | |
569 | TMPL_ARGS_LEVEL (args, i + extra_levels)); | |
570 | ||
571 | return new_args; | |
572 | } | |
573 | ||
5566b478 MS |
574 | /* We've got a template header coming up; push to a new level for storing |
575 | the parms. */ | |
8d08fdba | 576 | |
8d08fdba MS |
577 | void |
578 | begin_template_parm_list () | |
579 | { | |
6757edfe MM |
580 | /* We use a non-tag-transparent scope here, which causes pushtag to |
581 | put tags in this scope, rather than in the enclosing class or | |
582 | namespace scope. This is the right thing, since we want | |
583 | TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a | |
584 | global template class, push_template_decl handles putting the | |
585 | TEMPLATE_DECL into top-level scope. For a nested template class, | |
586 | e.g.: | |
587 | ||
588 | template <class T> struct S1 { | |
589 | template <class T> struct S2 {}; | |
590 | }; | |
591 | ||
592 | pushtag contains special code to call pushdecl_with_scope on the | |
593 | TEMPLATE_DECL for S2. */ | |
74b846e0 | 594 | begin_scope (sk_template_parms); |
5156628f | 595 | ++processing_template_decl; |
67ffc812 | 596 | ++processing_template_parmlist; |
386b8a85 JM |
597 | note_template_header (0); |
598 | } | |
599 | ||
6c30752f MM |
600 | /* This routine is called when a specialization is declared. If it is |
601 | illegal to declare a specialization here, an error is reported. */ | |
602 | ||
e9659ab0 | 603 | static void |
6c30752f MM |
604 | check_specialization_scope () |
605 | { | |
606 | tree scope = current_scope (); | |
3ddfb0e6 | 607 | |
6c30752f MM |
608 | /* [temp.expl.spec] |
609 | ||
610 | An explicit specialization shall be declared in the namespace of | |
611 | which the template is a member, or, for member templates, in the | |
612 | namespace of which the enclosing class or enclosing class | |
613 | template is a member. An explicit specialization of a member | |
614 | function, member class or static data member of a class template | |
615 | shall be declared in the namespace of which the class template | |
616 | is a member. */ | |
617 | if (scope && TREE_CODE (scope) != NAMESPACE_DECL) | |
8251199e | 618 | cp_error ("explicit specialization in non-namespace scope `%D'", |
6c30752f | 619 | scope); |
3ddfb0e6 | 620 | |
6c30752f MM |
621 | /* [temp.expl.spec] |
622 | ||
623 | In an explicit specialization declaration for a member of a class | |
624 | template or a member template that appears in namespace scope, | |
625 | the member template and some of its enclosing class templates may | |
626 | remain unspecialized, except that the declaration shall not | |
627 | explicitly specialize a class member template if its enclosing | |
628 | class templates are not explicitly specialized as well. */ | |
629 | if (current_template_parms) | |
fd4de5ff | 630 | cp_error ("enclosing class templates are not explicitly specialized"); |
6c30752f MM |
631 | } |
632 | ||
386b8a85 JM |
633 | /* We've just seen template <>. */ |
634 | ||
635 | void | |
636 | begin_specialization () | |
637 | { | |
74b846e0 | 638 | begin_scope (sk_template_spec); |
386b8a85 | 639 | note_template_header (1); |
6c30752f | 640 | check_specialization_scope (); |
386b8a85 JM |
641 | } |
642 | ||
dc957d14 | 643 | /* Called at then end of processing a declaration preceded by |
386b8a85 JM |
644 | template<>. */ |
645 | ||
646 | void | |
647 | end_specialization () | |
648 | { | |
74b846e0 | 649 | finish_scope (); |
386b8a85 JM |
650 | reset_specialization (); |
651 | } | |
652 | ||
386b8a85 JM |
653 | /* Any template <>'s that we have seen thus far are not referring to a |
654 | function specialization. */ | |
655 | ||
656 | void | |
657 | reset_specialization () | |
658 | { | |
659 | processing_specialization = 0; | |
660 | template_header_count = 0; | |
661 | } | |
662 | ||
386b8a85 JM |
663 | /* We've just seen a template header. If SPECIALIZATION is non-zero, |
664 | it was of the form template <>. */ | |
665 | ||
4966381a | 666 | static void |
386b8a85 JM |
667 | note_template_header (specialization) |
668 | int specialization; | |
669 | { | |
670 | processing_specialization = specialization; | |
671 | template_header_count++; | |
672 | } | |
673 | ||
75650646 | 674 | /* We're beginning an explicit instantiation. */ |
386b8a85 | 675 | |
75650646 MM |
676 | void |
677 | begin_explicit_instantiation () | |
386b8a85 | 678 | { |
75650646 MM |
679 | ++processing_explicit_instantiation; |
680 | } | |
386b8a85 | 681 | |
386b8a85 | 682 | |
75650646 MM |
683 | void |
684 | end_explicit_instantiation () | |
685 | { | |
686 | my_friendly_assert(processing_explicit_instantiation > 0, 0); | |
687 | --processing_explicit_instantiation; | |
688 | } | |
386b8a85 | 689 | |
36a117a5 MM |
690 | /* The TYPE is being declared. If it is a template type, that means it |
691 | is a partial specialization. Do appropriate error-checking. */ | |
692 | ||
693 | void | |
694 | maybe_process_partial_specialization (type) | |
695 | tree type; | |
696 | { | |
697 | if (IS_AGGR_TYPE (type) && CLASSTYPE_USE_TEMPLATE (type)) | |
698 | { | |
699 | if (CLASSTYPE_IMPLICIT_INSTANTIATION (type) | |
d0f062fb | 700 | && !COMPLETE_TYPE_P (type)) |
36a117a5 | 701 | { |
700466c2 JM |
702 | if (current_namespace |
703 | != decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type))) | |
704 | { | |
705 | cp_pedwarn ("specializing `%#T' in different namespace", type); | |
706 | cp_pedwarn_at (" from definition of `%#D'", | |
707 | CLASSTYPE_TI_TEMPLATE (type)); | |
708 | } | |
370af2d5 | 709 | SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type); |
36a117a5 MM |
710 | if (processing_template_decl) |
711 | push_template_decl (TYPE_MAIN_DECL (type)); | |
712 | } | |
713 | else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
8251199e | 714 | cp_error ("specialization of `%T' after instantiation", type); |
36a117a5 | 715 | } |
20496fa2 JM |
716 | else if (processing_specialization) |
717 | cp_error ("explicit specialization of non-template `%T'", type); | |
36a117a5 MM |
718 | } |
719 | ||
75650646 MM |
720 | /* Retrieve the specialization (in the sense of [temp.spec] - a |
721 | specialization is either an instantiation or an explicit | |
722 | specialization) of TMPL for the given template ARGS. If there is | |
723 | no such specialization, return NULL_TREE. The ARGS are a vector of | |
724 | arguments, or a vector of vectors of arguments, in the case of | |
725 | templates with more than one level of parameters. */ | |
726 | ||
727 | static tree | |
728 | retrieve_specialization (tmpl, args) | |
729 | tree tmpl; | |
730 | tree args; | |
731 | { | |
732 | tree s; | |
733 | ||
734 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
735 | ||
36a117a5 MM |
736 | /* There should be as many levels of arguments as there are |
737 | levels of parameters. */ | |
738 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
739 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
740 | 0); | |
741 | ||
75650646 MM |
742 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
743 | s != NULL_TREE; | |
744 | s = TREE_CHAIN (s)) | |
745 | if (comp_template_args (TREE_PURPOSE (s), args)) | |
746 | return TREE_VALUE (s); | |
747 | ||
748 | return NULL_TREE; | |
386b8a85 JM |
749 | } |
750 | ||
dc957d14 | 751 | /* Like retrieve_specialization, but for local declarations. */ |
9188c363 MM |
752 | |
753 | static tree | |
6dfbb909 | 754 | retrieve_local_specialization (tmpl) |
9188c363 | 755 | tree tmpl; |
9188c363 | 756 | { |
6dfbb909 | 757 | return (tree) htab_find (local_specializations, tmpl); |
9188c363 MM |
758 | } |
759 | ||
6757edfe MM |
760 | /* Returns non-zero iff DECL is a specialization of TMPL. */ |
761 | ||
762 | int | |
763 | is_specialization_of (decl, tmpl) | |
764 | tree decl; | |
765 | tree tmpl; | |
766 | { | |
767 | tree t; | |
768 | ||
769 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
770 | { | |
771 | for (t = decl; | |
772 | t != NULL_TREE; | |
773 | t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE) | |
774 | if (t == tmpl) | |
775 | return 1; | |
776 | } | |
777 | else | |
778 | { | |
779 | my_friendly_assert (TREE_CODE (decl) == TYPE_DECL, 0); | |
780 | ||
781 | for (t = TREE_TYPE (decl); | |
782 | t != NULL_TREE; | |
783 | t = CLASSTYPE_USE_TEMPLATE (t) | |
784 | ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE) | |
9edc3913 | 785 | if (same_type_ignoring_top_level_qualifiers_p (t, TREE_TYPE (tmpl))) |
6757edfe MM |
786 | return 1; |
787 | } | |
386b8a85 | 788 | |
6757edfe MM |
789 | return 0; |
790 | } | |
75650646 MM |
791 | |
792 | /* Register the specialization SPEC as a specialization of TMPL with | |
36a117a5 MM |
793 | the indicated ARGS. Returns SPEC, or an equivalent prior |
794 | declaration, if available. */ | |
75650646 | 795 | |
36a117a5 | 796 | static tree |
75650646 MM |
797 | register_specialization (spec, tmpl, args) |
798 | tree spec; | |
799 | tree tmpl; | |
800 | tree args; | |
801 | { | |
802 | tree s; | |
803 | ||
804 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
805 | ||
36a117a5 MM |
806 | if (TREE_CODE (spec) == FUNCTION_DECL |
807 | && uses_template_parms (DECL_TI_ARGS (spec))) | |
808 | /* This is the FUNCTION_DECL for a partial instantiation. Don't | |
809 | register it; we want the corresponding TEMPLATE_DECL instead. | |
810 | We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than | |
811 | the more obvious `uses_template_parms (spec)' to avoid problems | |
812 | with default function arguments. In particular, given | |
813 | something like this: | |
814 | ||
815 | template <class T> void f(T t1, T t = T()) | |
816 | ||
817 | the default argument expression is not substituted for in an | |
818 | instantiation unless and until it is actually needed. */ | |
819 | return spec; | |
75650646 | 820 | |
36a117a5 MM |
821 | /* There should be as many levels of arguments as there are |
822 | levels of parameters. */ | |
823 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
824 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
825 | 0); | |
826 | ||
75650646 MM |
827 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
828 | s != NULL_TREE; | |
829 | s = TREE_CHAIN (s)) | |
22e9174f MM |
830 | { |
831 | tree fn = TREE_VALUE (s); | |
832 | ||
833 | /* We can sometimes try to re-register a specialization that we've | |
834 | already got. In particular, regenerate_decl_from_template | |
835 | calls duplicate_decls which will update the specialization | |
836 | list. But, we'll still get called again here anyhow. It's | |
837 | more convenient to simply allow this than to try to prevent it. */ | |
838 | if (fn == spec) | |
839 | return spec; | |
840 | else if (comp_template_args (TREE_PURPOSE (s), args)) | |
841 | { | |
842 | if (DECL_TEMPLATE_SPECIALIZATION (spec)) | |
843 | { | |
844 | if (DECL_TEMPLATE_INSTANTIATION (fn)) | |
845 | { | |
846 | if (TREE_USED (fn) | |
847 | || DECL_EXPLICIT_INSTANTIATION (fn)) | |
848 | { | |
849 | cp_error ("specialization of %D after instantiation", | |
850 | fn); | |
851 | return spec; | |
852 | } | |
853 | else | |
854 | { | |
855 | /* This situation should occur only if the first | |
856 | specialization is an implicit instantiation, | |
857 | the second is an explicit specialization, and | |
858 | the implicit instantiation has not yet been | |
859 | used. That situation can occur if we have | |
860 | implicitly instantiated a member function and | |
861 | then specialized it later. | |
862 | ||
863 | We can also wind up here if a friend | |
864 | declaration that looked like an instantiation | |
865 | turns out to be a specialization: | |
866 | ||
867 | template <class T> void foo(T); | |
868 | class S { friend void foo<>(int) }; | |
869 | template <> void foo(int); | |
870 | ||
871 | We transform the existing DECL in place so that | |
872 | any pointers to it become pointers to the | |
873 | updated declaration. | |
874 | ||
875 | If there was a definition for the template, but | |
876 | not for the specialization, we want this to | |
877 | look as if there is no definition, and vice | |
878 | versa. */ | |
879 | DECL_INITIAL (fn) = NULL_TREE; | |
880 | duplicate_decls (spec, fn); | |
881 | ||
882 | return fn; | |
883 | } | |
884 | } | |
885 | else if (DECL_TEMPLATE_SPECIALIZATION (fn)) | |
886 | { | |
887 | duplicate_decls (spec, fn); | |
888 | return fn; | |
889 | } | |
890 | } | |
891 | } | |
75650646 MM |
892 | } |
893 | ||
894 | DECL_TEMPLATE_SPECIALIZATIONS (tmpl) | |
e1b3e07d | 895 | = tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl)); |
36a117a5 MM |
896 | |
897 | return spec; | |
898 | } | |
899 | ||
900 | /* Unregister the specialization SPEC as a specialization of TMPL. | |
901 | Returns nonzero if the SPEC was listed as a specialization of | |
902 | TMPL. */ | |
903 | ||
904 | static int | |
905 | unregister_specialization (spec, tmpl) | |
906 | tree spec; | |
907 | tree tmpl; | |
908 | { | |
909 | tree* s; | |
910 | ||
911 | for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl); | |
912 | *s != NULL_TREE; | |
913 | s = &TREE_CHAIN (*s)) | |
914 | if (TREE_VALUE (*s) == spec) | |
915 | { | |
916 | *s = TREE_CHAIN (*s); | |
917 | return 1; | |
918 | } | |
919 | ||
920 | return 0; | |
75650646 MM |
921 | } |
922 | ||
6dfbb909 MM |
923 | /* Like register_specialization, but for local declarations. We are |
924 | registering SPEC, an instantiation of TMPL. */ | |
9188c363 | 925 | |
414ea4aa | 926 | static void |
6dfbb909 | 927 | register_local_specialization (spec, tmpl) |
9188c363 MM |
928 | tree spec; |
929 | tree tmpl; | |
9188c363 | 930 | { |
6dfbb909 MM |
931 | void **slot; |
932 | ||
933 | slot = htab_find_slot (local_specializations, tmpl, INSERT); | |
934 | *slot = spec; | |
9188c363 MM |
935 | } |
936 | ||
e1467ff2 MM |
937 | /* Print the list of candidate FNS in an error message. */ |
938 | ||
104bf76a | 939 | void |
e1467ff2 MM |
940 | print_candidates (fns) |
941 | tree fns; | |
942 | { | |
943 | tree fn; | |
944 | ||
d8e178a0 | 945 | const char *str = "candidates are:"; |
e1467ff2 MM |
946 | |
947 | for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn)) | |
948 | { | |
d6479fe7 MM |
949 | tree f; |
950 | ||
951 | for (f = TREE_VALUE (fn); f; f = OVL_NEXT (f)) | |
952 | cp_error_at ("%s %+#D", str, OVL_CURRENT (f)); | |
e1467ff2 MM |
953 | str = " "; |
954 | } | |
955 | } | |
956 | ||
75650646 | 957 | /* Returns the template (one of the functions given by TEMPLATE_ID) |
e1467ff2 | 958 | which can be specialized to match the indicated DECL with the |
03017874 MM |
959 | explicit template args given in TEMPLATE_ID. The DECL may be |
960 | NULL_TREE if none is available. In that case, the functions in | |
961 | TEMPLATE_ID are non-members. | |
962 | ||
963 | If NEED_MEMBER_TEMPLATE is non-zero the function is known to be a | |
964 | specialization of a member template. | |
965 | ||
966 | The template args (those explicitly specified and those deduced) | |
967 | are output in a newly created vector *TARGS_OUT. | |
968 | ||
969 | If it is impossible to determine the result, an error message is | |
bf8f3f93 | 970 | issued. The error_mark_node is returned to indicate failure. */ |
75650646 | 971 | |
e9659ab0 | 972 | static tree |
e1467ff2 | 973 | determine_specialization (template_id, decl, targs_out, |
bf8f3f93 | 974 | need_member_template) |
386b8a85 | 975 | tree template_id; |
e1467ff2 | 976 | tree decl; |
386b8a85 JM |
977 | tree* targs_out; |
978 | int need_member_template; | |
386b8a85 | 979 | { |
03017874 MM |
980 | tree fns; |
981 | tree targs; | |
982 | tree explicit_targs; | |
983 | tree candidates = NULL_TREE; | |
984 | tree templates = NULL_TREE; | |
386b8a85 | 985 | |
e1467ff2 MM |
986 | *targs_out = NULL_TREE; |
987 | ||
f2e48b67 BK |
988 | if (template_id == error_mark_node) |
989 | return error_mark_node; | |
990 | ||
991 | fns = TREE_OPERAND (template_id, 0); | |
03017874 | 992 | explicit_targs = TREE_OPERAND (template_id, 1); |
f2e48b67 | 993 | |
27fafc8d JM |
994 | if (fns == error_mark_node) |
995 | return error_mark_node; | |
996 | ||
2c73f9f5 | 997 | /* Check for baselinks. */ |
91e490ab | 998 | if (BASELINK_P (fns)) |
2c73f9f5 | 999 | fns = TREE_VALUE (fns); |
386b8a85 | 1000 | |
91e490ab MM |
1001 | if (!is_overloaded_fn (fns)) |
1002 | { | |
9dfce8fd | 1003 | cp_error ("`%D' is not a function template", fns); |
91e490ab MM |
1004 | return error_mark_node; |
1005 | } | |
1006 | ||
2c73f9f5 | 1007 | for (; fns; fns = OVL_NEXT (fns)) |
386b8a85 | 1008 | { |
75650646 MM |
1009 | tree tmpl; |
1010 | ||
9dfce8fd | 1011 | tree fn = OVL_CURRENT (fns); |
03017874 MM |
1012 | |
1013 | if (TREE_CODE (fn) == TEMPLATE_DECL) | |
1014 | /* DECL might be a specialization of FN. */ | |
1015 | tmpl = fn; | |
1016 | else if (need_member_template) | |
1017 | /* FN is an ordinary member function, and we need a | |
1018 | specialization of a member template. */ | |
1019 | continue; | |
1020 | else if (TREE_CODE (fn) != FUNCTION_DECL) | |
1021 | /* We can get IDENTIFIER_NODEs here in certain erroneous | |
1022 | cases. */ | |
1023 | continue; | |
1024 | else if (!DECL_FUNCTION_MEMBER_P (fn)) | |
1025 | /* This is just an ordinary non-member function. Nothing can | |
1026 | be a specialization of that. */ | |
1027 | continue; | |
75650646 | 1028 | else |
03017874 MM |
1029 | { |
1030 | tree decl_arg_types; | |
386b8a85 | 1031 | |
03017874 MM |
1032 | /* This is an ordinary member function. However, since |
1033 | we're here, we can assume it's enclosing class is a | |
1034 | template class. For example, | |
1035 | ||
1036 | template <typename T> struct S { void f(); }; | |
1037 | template <> void S<int>::f() {} | |
1038 | ||
1039 | Here, S<int>::f is a non-template, but S<int> is a | |
1040 | template class. If FN has the same type as DECL, we | |
1041 | might be in business. */ | |
1042 | if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)), | |
1043 | TREE_TYPE (TREE_TYPE (fn)))) | |
1044 | /* The return types differ. */ | |
1045 | continue; | |
1046 | ||
1047 | /* Adjust the type of DECL in case FN is a static member. */ | |
1048 | decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1049 | if (DECL_STATIC_FUNCTION_P (fn) | |
1050 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1051 | decl_arg_types = TREE_CHAIN (decl_arg_types); | |
1052 | ||
1053 | if (compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
1054 | decl_arg_types)) | |
1055 | /* They match! */ | |
1056 | candidates = tree_cons (NULL_TREE, fn, candidates); | |
1057 | ||
1058 | continue; | |
1059 | } | |
386b8a85 | 1060 | |
bf8f3f93 MM |
1061 | /* See whether this function might be a specialization of this |
1062 | template. */ | |
1063 | targs = get_bindings (tmpl, decl, explicit_targs); | |
03017874 MM |
1064 | |
1065 | if (!targs) | |
bf8f3f93 | 1066 | /* We cannot deduce template arguments that when used to |
03017874 MM |
1067 | specialize TMPL will produce DECL. */ |
1068 | continue; | |
1069 | ||
1070 | /* Save this template, and the arguments deduced. */ | |
e1b3e07d | 1071 | templates = tree_cons (targs, tmpl, templates); |
386b8a85 | 1072 | } |
03017874 | 1073 | |
bf8f3f93 | 1074 | if (templates && TREE_CHAIN (templates)) |
386b8a85 | 1075 | { |
03017874 MM |
1076 | /* We have: |
1077 | ||
1078 | [temp.expl.spec] | |
1079 | ||
1080 | It is possible for a specialization with a given function | |
1081 | signature to be instantiated from more than one function | |
1082 | template. In such cases, explicit specification of the | |
1083 | template arguments must be used to uniquely identify the | |
1084 | function template specialization being specialized. | |
1085 | ||
1086 | Note that here, there's no suggestion that we're supposed to | |
1087 | determine which of the candidate templates is most | |
1088 | specialized. However, we, also have: | |
1089 | ||
1090 | [temp.func.order] | |
1091 | ||
1092 | Partial ordering of overloaded function template | |
1093 | declarations is used in the following contexts to select | |
1094 | the function template to which a function template | |
1095 | specialization refers: | |
1096 | ||
1097 | -- when an explicit specialization refers to a function | |
1098 | template. | |
1099 | ||
1100 | So, we do use the partial ordering rules, at least for now. | |
1101 | This extension can only serve to make illegal programs legal, | |
1102 | so it's safe. And, there is strong anecdotal evidence that | |
1103 | the committee intended the partial ordering rules to apply; | |
1104 | the EDG front-end has that behavior, and John Spicer claims | |
1105 | that the committee simply forgot to delete the wording in | |
1106 | [temp.expl.spec]. */ | |
1107 | tree tmpl = most_specialized (templates, decl, explicit_targs); | |
1108 | if (tmpl && tmpl != error_mark_node) | |
1109 | { | |
1110 | targs = get_bindings (tmpl, decl, explicit_targs); | |
e1b3e07d | 1111 | templates = tree_cons (targs, tmpl, NULL_TREE); |
03017874 | 1112 | } |
e1467ff2 MM |
1113 | } |
1114 | ||
03017874 | 1115 | if (templates == NULL_TREE && candidates == NULL_TREE) |
e1467ff2 | 1116 | { |
bf8f3f93 MM |
1117 | cp_error_at ("template-id `%D' for `%+D' does not match any template declaration", |
1118 | template_id, decl); | |
03017874 | 1119 | return error_mark_node; |
386b8a85 | 1120 | } |
03017874 | 1121 | else if ((templates && TREE_CHAIN (templates)) |
bf8f3f93 MM |
1122 | || (candidates && TREE_CHAIN (candidates)) |
1123 | || (templates && candidates)) | |
386b8a85 | 1124 | { |
bf8f3f93 MM |
1125 | cp_error_at ("ambiguous template specialization `%D' for `%+D'", |
1126 | template_id, decl); | |
1127 | chainon (candidates, templates); | |
1128 | print_candidates (candidates); | |
03017874 | 1129 | return error_mark_node; |
386b8a85 JM |
1130 | } |
1131 | ||
1132 | /* We have one, and exactly one, match. */ | |
03017874 MM |
1133 | if (candidates) |
1134 | { | |
1135 | /* It was a specialization of an ordinary member function in a | |
1136 | template class. */ | |
1137 | *targs_out = copy_node (DECL_TI_ARGS (TREE_VALUE (candidates))); | |
1138 | return DECL_TI_TEMPLATE (TREE_VALUE (candidates)); | |
1139 | } | |
1140 | ||
1141 | /* It was a specialization of a template. */ | |
17aec3eb | 1142 | targs = DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates))); |
03017874 MM |
1143 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs)) |
1144 | { | |
1145 | *targs_out = copy_node (targs); | |
1146 | SET_TMPL_ARGS_LEVEL (*targs_out, | |
1147 | TMPL_ARGS_DEPTH (*targs_out), | |
1148 | TREE_PURPOSE (templates)); | |
1149 | } | |
1150 | else | |
1151 | *targs_out = TREE_PURPOSE (templates); | |
e1467ff2 | 1152 | return TREE_VALUE (templates); |
8d08fdba | 1153 | } |
6757edfe | 1154 | |
386b8a85 | 1155 | /* Check to see if the function just declared, as indicated in |
75650646 MM |
1156 | DECLARATOR, and in DECL, is a specialization of a function |
1157 | template. We may also discover that the declaration is an explicit | |
1158 | instantiation at this point. | |
1159 | ||
e1467ff2 | 1160 | Returns DECL, or an equivalent declaration that should be used |
03017874 MM |
1161 | instead if all goes well. Issues an error message if something is |
1162 | amiss. Returns error_mark_node if the error is not easily | |
1163 | recoverable. | |
75650646 | 1164 | |
75650646 MM |
1165 | FLAGS is a bitmask consisting of the following flags: |
1166 | ||
75650646 MM |
1167 | 2: The function has a definition. |
1168 | 4: The function is a friend. | |
75650646 MM |
1169 | |
1170 | The TEMPLATE_COUNT is the number of references to qualifying | |
1171 | template classes that appeared in the name of the function. For | |
1172 | example, in | |
1173 | ||
1174 | template <class T> struct S { void f(); }; | |
1175 | void S<int>::f(); | |
1176 | ||
1177 | the TEMPLATE_COUNT would be 1. However, explicitly specialized | |
1178 | classes are not counted in the TEMPLATE_COUNT, so that in | |
1179 | ||
1180 | template <class T> struct S {}; | |
1181 | template <> struct S<int> { void f(); } | |
36a117a5 | 1182 | template <> void S<int>::f(); |
75650646 MM |
1183 | |
1184 | the TEMPLATE_COUNT would be 0. (Note that this declaration is | |
1185 | illegal; there should be no template <>.) | |
1186 | ||
1187 | If the function is a specialization, it is marked as such via | |
1188 | DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO | |
1189 | is set up correctly, and it is added to the list of specializations | |
1190 | for that template. */ | |
386b8a85 | 1191 | |
e1467ff2 | 1192 | tree |
27bb8339 | 1193 | check_explicit_specialization (declarator, decl, template_count, flags) |
386b8a85 JM |
1194 | tree declarator; |
1195 | tree decl; | |
1196 | int template_count; | |
1197 | int flags; | |
1198 | { | |
75650646 MM |
1199 | int have_def = flags & 2; |
1200 | int is_friend = flags & 4; | |
1201 | int specialization = 0; | |
e1467ff2 | 1202 | int explicit_instantiation = 0; |
fd4de5ff | 1203 | int member_specialization = 0; |
75650646 MM |
1204 | tree ctype = DECL_CLASS_CONTEXT (decl); |
1205 | tree dname = DECL_NAME (decl); | |
74b846e0 | 1206 | tmpl_spec_kind tsk; |
386b8a85 | 1207 | |
74b846e0 | 1208 | tsk = current_tmpl_spec_kind (template_count); |
75650646 | 1209 | |
74b846e0 MM |
1210 | switch (tsk) |
1211 | { | |
1212 | case tsk_none: | |
1213 | if (processing_specialization) | |
75650646 | 1214 | { |
fd4de5ff MM |
1215 | specialization = 1; |
1216 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
75650646 | 1217 | } |
74b846e0 | 1218 | else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) |
386b8a85 | 1219 | { |
74b846e0 MM |
1220 | if (is_friend) |
1221 | /* This could be something like: | |
75650646 | 1222 | |
74b846e0 MM |
1223 | template <class T> void f(T); |
1224 | class S { friend void f<>(int); } */ | |
1225 | specialization = 1; | |
1226 | else | |
1227 | { | |
1228 | /* This case handles bogus declarations like template <> | |
1229 | template <class T> void f<int>(); */ | |
1230 | ||
1231 | cp_error ("template-id `%D' in declaration of primary template", | |
1232 | declarator); | |
1233 | return decl; | |
1234 | } | |
1235 | } | |
1236 | break; | |
1237 | ||
1238 | case tsk_invalid_member_spec: | |
1239 | /* The error has already been reported in | |
1240 | check_specialization_scope. */ | |
1241 | return error_mark_node; | |
1242 | ||
1243 | case tsk_invalid_expl_inst: | |
1244 | cp_error ("template parameter list used in explicit instantiation"); | |
1245 | ||
1246 | /* Fall through. */ | |
1247 | ||
1248 | case tsk_expl_inst: | |
fd4de5ff MM |
1249 | if (have_def) |
1250 | cp_error ("definition provided for explicit instantiation"); | |
74b846e0 | 1251 | |
fd4de5ff | 1252 | explicit_instantiation = 1; |
74b846e0 | 1253 | break; |
fd4de5ff | 1254 | |
74b846e0 MM |
1255 | case tsk_excessive_parms: |
1256 | cp_error ("too many template parameter lists in declaration of `%D'", | |
1257 | decl); | |
1258 | return error_mark_node; | |
75650646 | 1259 | |
74b846e0 MM |
1260 | /* Fall through. */ |
1261 | case tsk_expl_spec: | |
1262 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1263 | if (ctype) | |
1264 | member_specialization = 1; | |
1265 | else | |
1266 | specialization = 1; | |
1267 | break; | |
1268 | ||
1269 | case tsk_insufficient_parms: | |
fd4de5ff MM |
1270 | if (template_header_count) |
1271 | { | |
74b846e0 MM |
1272 | cp_error("too few template parameter lists in declaration of `%D'", |
1273 | decl); | |
fd4de5ff | 1274 | return decl; |
c6f2ed0d | 1275 | } |
74b846e0 MM |
1276 | else if (ctype != NULL_TREE |
1277 | && !TYPE_BEING_DEFINED (ctype) | |
1278 | && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype) | |
1279 | && !is_friend) | |
1280 | { | |
1281 | /* For backwards compatibility, we accept: | |
fd4de5ff | 1282 | |
74b846e0 MM |
1283 | template <class T> struct S { void f(); }; |
1284 | void S<int>::f() {} // Missing template <> | |
fd4de5ff | 1285 | |
74b846e0 MM |
1286 | That used to be legal C++. */ |
1287 | if (pedantic) | |
1288 | cp_pedwarn | |
1289 | ("explicit specialization not preceded by `template <>'"); | |
1290 | specialization = 1; | |
1291 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1292 | } | |
1293 | break; | |
1294 | ||
1295 | case tsk_template: | |
1296 | if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
c6f2ed0d | 1297 | { |
fd4de5ff MM |
1298 | /* This case handles bogus declarations like template <> |
1299 | template <class T> void f<int>(); */ | |
75650646 | 1300 | |
655dc6ee JM |
1301 | if (uses_template_parms (declarator)) |
1302 | cp_error ("partial specialization `%D' of function template", | |
1303 | declarator); | |
1304 | else | |
1305 | cp_error ("template-id `%D' in declaration of primary template", | |
1306 | declarator); | |
fd4de5ff | 1307 | return decl; |
386b8a85 | 1308 | } |
74b846e0 MM |
1309 | |
1310 | if (ctype && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype)) | |
1311 | /* This is a specialization of a member template, without | |
1312 | specialization the containing class. Something like: | |
1313 | ||
1314 | template <class T> struct S { | |
1315 | template <class U> void f (U); | |
1316 | }; | |
1317 | template <> template <class U> void S<int>::f(U) {} | |
1318 | ||
1319 | That's a specialization -- but of the entire template. */ | |
1320 | specialization = 1; | |
1321 | break; | |
1322 | ||
1323 | default: | |
1324 | my_friendly_abort (20000309); | |
75650646 | 1325 | } |
386b8a85 | 1326 | |
670960ac JM |
1327 | if (specialization || member_specialization) |
1328 | { | |
1329 | tree t = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1330 | for (; t; t = TREE_CHAIN (t)) | |
1331 | if (TREE_PURPOSE (t)) | |
1332 | { | |
8251199e JM |
1333 | cp_pedwarn |
1334 | ("default argument specified in explicit specialization"); | |
670960ac JM |
1335 | break; |
1336 | } | |
f3400fe2 JM |
1337 | if (current_lang_name == lang_name_c) |
1338 | cp_error ("template specialization with C linkage"); | |
670960ac JM |
1339 | } |
1340 | ||
e1467ff2 | 1341 | if (specialization || member_specialization || explicit_instantiation) |
75650646 MM |
1342 | { |
1343 | tree tmpl = NULL_TREE; | |
1344 | tree targs = NULL_TREE; | |
75650646 MM |
1345 | |
1346 | /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */ | |
386b8a85 JM |
1347 | if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR) |
1348 | { | |
1349 | tree fns; | |
1350 | ||
1351 | my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, | |
1352 | 0); | |
1353 | if (!ctype) | |
30394414 | 1354 | fns = IDENTIFIER_NAMESPACE_VALUE (dname); |
386b8a85 JM |
1355 | else |
1356 | fns = dname; | |
1357 | ||
75650646 MM |
1358 | declarator = |
1359 | lookup_template_function (fns, NULL_TREE); | |
386b8a85 JM |
1360 | } |
1361 | ||
f2e48b67 BK |
1362 | if (declarator == error_mark_node) |
1363 | return error_mark_node; | |
1364 | ||
75650646 MM |
1365 | if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype)) |
1366 | { | |
8ec2ac34 | 1367 | if (!explicit_instantiation) |
6c30752f MM |
1368 | /* A specialization in class scope. This is illegal, |
1369 | but the error will already have been flagged by | |
1370 | check_specialization_scope. */ | |
1371 | return error_mark_node; | |
8ec2ac34 | 1372 | else |
b370501f KG |
1373 | { |
1374 | /* It's not legal to write an explicit instantiation in | |
1375 | class scope, e.g.: | |
8ec2ac34 | 1376 | |
b370501f | 1377 | class C { template void f(); } |
8ec2ac34 | 1378 | |
b370501f KG |
1379 | This case is caught by the parser. However, on |
1380 | something like: | |
8ec2ac34 | 1381 | |
b370501f | 1382 | template class C { void f(); }; |
8ec2ac34 | 1383 | |
b370501f KG |
1384 | (which is illegal) we can get here. The error will be |
1385 | issued later. */ | |
1386 | ; | |
1387 | } | |
8ec2ac34 | 1388 | |
e1467ff2 | 1389 | return decl; |
75650646 | 1390 | } |
8f032717 MM |
1391 | else if (TREE_CODE (TREE_OPERAND (declarator, 0)) == LOOKUP_EXPR) |
1392 | { | |
1393 | /* A friend declaration. We can't do much, because we don't | |
1394 | know what this resolves to, yet. */ | |
1395 | my_friendly_assert (is_friend != 0, 0); | |
1396 | my_friendly_assert (!explicit_instantiation, 0); | |
1397 | SET_DECL_IMPLICIT_INSTANTIATION (decl); | |
1398 | return decl; | |
1399 | } | |
75650646 MM |
1400 | else if (ctype != NULL_TREE |
1401 | && (TREE_CODE (TREE_OPERAND (declarator, 0)) == | |
1402 | IDENTIFIER_NODE)) | |
386b8a85 | 1403 | { |
75650646 MM |
1404 | /* Find the list of functions in ctype that have the same |
1405 | name as the declared function. */ | |
1406 | tree name = TREE_OPERAND (declarator, 0); | |
03017874 MM |
1407 | tree fns = NULL_TREE; |
1408 | int idx; | |
1409 | ||
75650646 MM |
1410 | if (name == constructor_name (ctype) |
1411 | || name == constructor_name_full (ctype)) | |
386b8a85 | 1412 | { |
75650646 MM |
1413 | int is_constructor = DECL_CONSTRUCTOR_P (decl); |
1414 | ||
1415 | if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype) | |
1416 | : !TYPE_HAS_DESTRUCTOR (ctype)) | |
1417 | { | |
1418 | /* From [temp.expl.spec]: | |
e1467ff2 | 1419 | |
75650646 MM |
1420 | If such an explicit specialization for the member |
1421 | of a class template names an implicitly-declared | |
1422 | special member function (clause _special_), the | |
e1467ff2 MM |
1423 | program is ill-formed. |
1424 | ||
1425 | Similar language is found in [temp.explicit]. */ | |
8251199e | 1426 | cp_error ("specialization of implicitly-declared special member function"); |
03017874 | 1427 | return error_mark_node; |
75650646 | 1428 | } |
386b8a85 | 1429 | |
42da2fd8 | 1430 | name = is_constructor ? ctor_identifier : dtor_identifier; |
75650646 | 1431 | } |
42da2fd8 | 1432 | |
421844e7 | 1433 | if (!DECL_CONV_FN_P (decl)) |
03017874 MM |
1434 | { |
1435 | idx = lookup_fnfields_1 (ctype, name); | |
1436 | if (idx >= 0) | |
1437 | fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (ctype), idx); | |
1438 | } | |
1439 | else | |
1440 | { | |
1441 | tree methods; | |
1442 | ||
1443 | /* For a type-conversion operator, we cannot do a | |
1444 | name-based lookup. We might be looking for `operator | |
1445 | int' which will be a specialization of `operator T'. | |
1446 | So, we find *all* the conversion operators, and then | |
1447 | select from them. */ | |
1448 | fns = NULL_TREE; | |
1449 | ||
1450 | methods = CLASSTYPE_METHOD_VEC (ctype); | |
1451 | if (methods) | |
1452 | for (idx = 2; idx < TREE_VEC_LENGTH (methods); ++idx) | |
1453 | { | |
1454 | tree ovl = TREE_VEC_ELT (methods, idx); | |
1455 | ||
1456 | if (!ovl || !DECL_CONV_FN_P (OVL_CURRENT (ovl))) | |
1457 | /* There are no more conversion functions. */ | |
1458 | break; | |
1459 | ||
1460 | /* Glue all these conversion functions together | |
1461 | with those we already have. */ | |
1462 | for (; ovl; ovl = OVL_NEXT (ovl)) | |
1463 | fns = ovl_cons (OVL_CURRENT (ovl), fns); | |
1464 | } | |
1465 | } | |
1466 | ||
386b8a85 JM |
1467 | if (fns == NULL_TREE) |
1468 | { | |
b3f738da MM |
1469 | cp_error ("no member function `%D' declared in `%T'", |
1470 | name, ctype); | |
03017874 | 1471 | return error_mark_node; |
386b8a85 JM |
1472 | } |
1473 | else | |
1474 | TREE_OPERAND (declarator, 0) = fns; | |
1475 | } | |
75650646 | 1476 | |
e1467ff2 MM |
1477 | /* Figure out what exactly is being specialized at this point. |
1478 | Note that for an explicit instantiation, even one for a | |
38e01259 | 1479 | member function, we cannot tell apriori whether the |
e1467ff2 | 1480 | instantiation is for a member template, or just a member |
36a117a5 MM |
1481 | function of a template class. Even if a member template is |
1482 | being instantiated, the member template arguments may be | |
1483 | elided if they can be deduced from the rest of the | |
1484 | declaration. */ | |
e1467ff2 MM |
1485 | tmpl = determine_specialization (declarator, decl, |
1486 | &targs, | |
bf8f3f93 | 1487 | member_specialization); |
386b8a85 | 1488 | |
03017874 MM |
1489 | if (!tmpl || tmpl == error_mark_node) |
1490 | /* We couldn't figure out what this declaration was | |
1491 | specializing. */ | |
1492 | return error_mark_node; | |
1493 | else | |
386b8a85 | 1494 | { |
25aab5d0 | 1495 | tree gen_tmpl = most_general_template (tmpl); |
36a117a5 | 1496 | |
e1467ff2 MM |
1497 | if (explicit_instantiation) |
1498 | { | |
03d0f4af | 1499 | /* We don't set DECL_EXPLICIT_INSTANTIATION here; that |
25aab5d0 MM |
1500 | is done by do_decl_instantiation later. */ |
1501 | ||
1502 | int arg_depth = TMPL_ARGS_DEPTH (targs); | |
1503 | int parm_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)); | |
1504 | ||
1505 | if (arg_depth > parm_depth) | |
1506 | { | |
1507 | /* If TMPL is not the most general template (for | |
1508 | example, if TMPL is a friend template that is | |
1509 | injected into namespace scope), then there will | |
dc957d14 | 1510 | be too many levels of TARGS. Remove some of them |
25aab5d0 MM |
1511 | here. */ |
1512 | int i; | |
1513 | tree new_targs; | |
1514 | ||
f31c0a32 | 1515 | new_targs = make_tree_vec (parm_depth); |
25aab5d0 MM |
1516 | for (i = arg_depth - parm_depth; i < arg_depth; ++i) |
1517 | TREE_VEC_ELT (new_targs, i - (arg_depth - parm_depth)) | |
1518 | = TREE_VEC_ELT (targs, i); | |
1519 | targs = new_targs; | |
1520 | } | |
1521 | ||
74b846e0 | 1522 | return instantiate_template (tmpl, targs); |
e1467ff2 | 1523 | } |
74b846e0 | 1524 | |
f9a7ae04 MM |
1525 | /* If this is a specialization of a member template of a |
1526 | template class. In we want to return the TEMPLATE_DECL, | |
1527 | not the specialization of it. */ | |
74b846e0 MM |
1528 | if (tsk == tsk_template) |
1529 | { | |
1530 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
f9a7ae04 | 1531 | DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl)) = NULL_TREE; |
74b846e0 MM |
1532 | return tmpl; |
1533 | } | |
1534 | ||
36a117a5 MM |
1535 | /* If we though that the DECL was a member function, but it |
1536 | turns out to be specializing a static member function, | |
1537 | make DECL a static member function as well. */ | |
1538 | if (DECL_STATIC_FUNCTION_P (tmpl) | |
1539 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
366c0f1e | 1540 | { |
3afb32a4 | 1541 | revert_static_member_fn (decl); |
366c0f1e MM |
1542 | last_function_parms = TREE_CHAIN (last_function_parms); |
1543 | } | |
e1467ff2 | 1544 | |
edac124d KL |
1545 | /* Inherit default function arguments from the template |
1546 | DECL is specializing. */ | |
1547 | { | |
1548 | tree t1 = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1549 | tree t2 = TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl))); | |
1550 | ||
1551 | /* DECL may contain more parameters than TMPL due to the extra | |
1552 | in-charge parameter in constructors and destructors. */ | |
1553 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1554 | t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2); | |
1555 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) | |
1556 | t1 = TREE_CHAIN (t1); | |
1557 | ||
1558 | /* Note that we do not need to reparse default arguments, | |
1559 | since explicit specialization cannot be declared in | |
1560 | class scope as in [temp.expl.spec]. */ | |
1561 | for (; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) | |
1562 | { | |
1563 | if (TREE_PURPOSE (t2)) | |
1564 | TREE_PURPOSE (t1) = TREE_PURPOSE (t2); | |
1565 | } | |
1566 | ||
1567 | my_friendly_assert (t1 == NULL_TREE && t2 == NULL_TREE, 20001211); | |
1568 | } | |
1569 | ||
36a117a5 | 1570 | /* Set up the DECL_TEMPLATE_INFO for DECL. */ |
e1b3e07d | 1571 | DECL_TEMPLATE_INFO (decl) = tree_cons (tmpl, targs, NULL_TREE); |
36a117a5 | 1572 | |
e1467ff2 MM |
1573 | /* Mangle the function name appropriately. Note that we do |
1574 | not mangle specializations of non-template member | |
1575 | functions of template classes, e.g. with | |
36a117a5 | 1576 | |
e1467ff2 | 1577 | template <class T> struct S { void f(); } |
36a117a5 | 1578 | |
e1467ff2 | 1579 | and given the specialization |
36a117a5 | 1580 | |
e1467ff2 | 1581 | template <> void S<int>::f() {} |
36a117a5 | 1582 | |
e1467ff2 MM |
1583 | we do not mangle S<int>::f() here. That's because it's |
1584 | just an ordinary member function and doesn't need special | |
36a117a5 | 1585 | treatment. We do this here so that the ordinary, |
74b846e0 | 1586 | non-template, name-mangling algorithm will not be used |
36a117a5 | 1587 | later. */ |
669ec2b4 JM |
1588 | if ((is_member_template (tmpl) || ctype == NULL_TREE) |
1589 | && name_mangling_version >= 1) | |
1590 | set_mangled_name_for_template_decl (decl); | |
386b8a85 JM |
1591 | |
1592 | if (is_friend && !have_def) | |
36a117a5 MM |
1593 | /* This is not really a declaration of a specialization. |
1594 | It's just the name of an instantiation. But, it's not | |
1595 | a request for an instantiation, either. */ | |
fbf1c34b | 1596 | SET_DECL_IMPLICIT_INSTANTIATION (decl); |
75650646 | 1597 | |
36a117a5 MM |
1598 | /* Register this specialization so that we can find it |
1599 | again. */ | |
1600 | decl = register_specialization (decl, gen_tmpl, targs); | |
386b8a85 JM |
1601 | } |
1602 | } | |
75650646 | 1603 | |
e1467ff2 | 1604 | return decl; |
386b8a85 | 1605 | } |
75650646 | 1606 | |
39c01e4c MM |
1607 | /* TYPE is being declared. Verify that the use of template headers |
1608 | and such is reasonable. Issue error messages if not. */ | |
1609 | ||
1610 | void | |
1611 | maybe_check_template_type (type) | |
1612 | tree type; | |
1613 | { | |
1614 | if (template_header_count) | |
1615 | { | |
1616 | /* We are in the scope of some `template <...>' header. */ | |
1617 | ||
1618 | int context_depth | |
1619 | = template_class_depth_real (TYPE_CONTEXT (type), | |
1620 | /*count_specializations=*/1); | |
1621 | ||
1622 | if (template_header_count <= context_depth) | |
1623 | /* This is OK; the template headers are for the context. We | |
1624 | are actually too lenient here; like | |
1625 | check_explicit_specialization we should consider the number | |
1626 | of template types included in the actual declaration. For | |
1627 | example, | |
1628 | ||
1629 | template <class T> struct S { | |
1630 | template <class U> template <class V> | |
1631 | struct I {}; | |
1632 | }; | |
1633 | ||
1634 | is illegal, but: | |
1635 | ||
1636 | template <class T> struct S { | |
1637 | template <class U> struct I; | |
1638 | }; | |
1639 | ||
1640 | template <class T> template <class U. | |
1641 | struct S<T>::I {}; | |
1642 | ||
1643 | is not. */ | |
1644 | ; | |
1645 | else if (template_header_count > context_depth + 1) | |
1646 | /* There are two many template parameter lists. */ | |
8251199e | 1647 | cp_error ("too many template parameter lists in declaration of `%T'", type); |
39c01e4c MM |
1648 | } |
1649 | } | |
1650 | ||
75650646 MM |
1651 | /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template |
1652 | parameters. These are represented in the same format used for | |
1653 | DECL_TEMPLATE_PARMS. */ | |
1654 | ||
1655 | int comp_template_parms (parms1, parms2) | |
1656 | tree parms1; | |
1657 | tree parms2; | |
1658 | { | |
1659 | tree p1; | |
1660 | tree p2; | |
1661 | ||
1662 | if (parms1 == parms2) | |
1663 | return 1; | |
1664 | ||
1665 | for (p1 = parms1, p2 = parms2; | |
1666 | p1 != NULL_TREE && p2 != NULL_TREE; | |
1667 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2)) | |
1668 | { | |
1669 | tree t1 = TREE_VALUE (p1); | |
1670 | tree t2 = TREE_VALUE (p2); | |
1671 | int i; | |
1672 | ||
1673 | my_friendly_assert (TREE_CODE (t1) == TREE_VEC, 0); | |
1674 | my_friendly_assert (TREE_CODE (t2) == TREE_VEC, 0); | |
1675 | ||
1676 | if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2)) | |
1677 | return 0; | |
1678 | ||
1679 | for (i = 0; i < TREE_VEC_LENGTH (t2); ++i) | |
1680 | { | |
1681 | tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i)); | |
1682 | tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i)); | |
1683 | ||
1684 | if (TREE_CODE (parm1) != TREE_CODE (parm2)) | |
1685 | return 0; | |
1686 | ||
1687 | if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM) | |
1688 | continue; | |
3bfdc719 | 1689 | else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2))) |
75650646 MM |
1690 | return 0; |
1691 | } | |
1692 | } | |
1693 | ||
1694 | if ((p1 != NULL_TREE) != (p2 != NULL_TREE)) | |
1695 | /* One set of parameters has more parameters lists than the | |
1696 | other. */ | |
1697 | return 0; | |
1698 | ||
1699 | return 1; | |
1700 | } | |
1701 | ||
f3400fe2 JM |
1702 | /* Complain if DECL shadows a template parameter. |
1703 | ||
1704 | [temp.local]: A template-parameter shall not be redeclared within its | |
1705 | scope (including nested scopes). */ | |
1706 | ||
1707 | void | |
1708 | check_template_shadow (decl) | |
1709 | tree decl; | |
1710 | { | |
8f032717 MM |
1711 | tree olddecl; |
1712 | ||
b5d9b9ab MM |
1713 | /* If we're not in a template, we can't possibly shadow a template |
1714 | parameter. */ | |
1715 | if (!current_template_parms) | |
1716 | return; | |
1717 | ||
1718 | /* Figure out what we're shadowing. */ | |
8f032717 MM |
1719 | if (TREE_CODE (decl) == OVERLOAD) |
1720 | decl = OVL_CURRENT (decl); | |
1721 | olddecl = IDENTIFIER_VALUE (DECL_NAME (decl)); | |
f3400fe2 | 1722 | |
b5d9b9ab MM |
1723 | /* If there's no previous binding for this name, we're not shadowing |
1724 | anything, let alone a template parameter. */ | |
1725 | if (!olddecl) | |
1726 | return; | |
1727 | ||
1728 | /* If we're not shadowing a template parameter, we're done. Note | |
1729 | that OLDDECL might be an OVERLOAD (or perhaps even an | |
1730 | ERROR_MARK), so we can't just blithely assume it to be a _DECL | |
1731 | node. */ | |
2f939d94 | 1732 | if (!DECL_P (olddecl) || !DECL_TEMPLATE_PARM_P (olddecl)) |
b5d9b9ab MM |
1733 | return; |
1734 | ||
1735 | /* We check for decl != olddecl to avoid bogus errors for using a | |
1736 | name inside a class. We check TPFI to avoid duplicate errors for | |
1737 | inline member templates. */ | |
1738 | if (decl == olddecl | |
1739 | || TEMPLATE_PARMS_FOR_INLINE (current_template_parms)) | |
1740 | return; | |
1741 | ||
1742 | cp_error_at ("declaration of `%#D'", decl); | |
1743 | cp_error_at (" shadows template parm `%#D'", olddecl); | |
f3400fe2 | 1744 | } |
22a7be53 | 1745 | |
f3400fe2 | 1746 | /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL, |
f84b4be9 JM |
1747 | ORIG_LEVEL, DECL, and TYPE. */ |
1748 | ||
1749 | static tree | |
1750 | build_template_parm_index (index, level, orig_level, decl, type) | |
1751 | int index; | |
1752 | int level; | |
1753 | int orig_level; | |
1754 | tree decl; | |
1755 | tree type; | |
1756 | { | |
1757 | tree t = make_node (TEMPLATE_PARM_INDEX); | |
1758 | TEMPLATE_PARM_IDX (t) = index; | |
1759 | TEMPLATE_PARM_LEVEL (t) = level; | |
1760 | TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level; | |
1761 | TEMPLATE_PARM_DECL (t) = decl; | |
1762 | TREE_TYPE (t) = type; | |
1763 | ||
1764 | return t; | |
1765 | } | |
1766 | ||
f84b4be9 | 1767 | /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose |
93cdc044 | 1768 | TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a |
f84b4be9 JM |
1769 | TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a |
1770 | new one is created. */ | |
1771 | ||
1772 | static tree | |
93cdc044 | 1773 | reduce_template_parm_level (index, type, levels) |
f84b4be9 JM |
1774 | tree index; |
1775 | tree type; | |
93cdc044 | 1776 | int levels; |
f84b4be9 JM |
1777 | { |
1778 | if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE | |
1779 | || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index)) | |
93cdc044 | 1780 | != TEMPLATE_PARM_LEVEL (index) - levels)) |
f84b4be9 JM |
1781 | { |
1782 | tree decl | |
1783 | = build_decl (TREE_CODE (TEMPLATE_PARM_DECL (index)), | |
1784 | DECL_NAME (TEMPLATE_PARM_DECL (index)), | |
1785 | type); | |
1786 | tree t | |
1787 | = build_template_parm_index (TEMPLATE_PARM_IDX (index), | |
93cdc044 | 1788 | TEMPLATE_PARM_LEVEL (index) - levels, |
f84b4be9 JM |
1789 | TEMPLATE_PARM_ORIG_LEVEL (index), |
1790 | decl, type); | |
1791 | TEMPLATE_PARM_DESCENDANTS (index) = t; | |
cae40af6 | 1792 | |
c2beae77 KL |
1793 | DECL_ARTIFICIAL (decl) = 1; |
1794 | SET_DECL_TEMPLATE_PARM_P (decl); | |
1795 | ||
cae40af6 JM |
1796 | /* Template template parameters need this. */ |
1797 | DECL_TEMPLATE_PARMS (decl) | |
1798 | = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index)); | |
f84b4be9 JM |
1799 | } |
1800 | ||
1801 | return TEMPLATE_PARM_DESCENDANTS (index); | |
1802 | } | |
1803 | ||
8d08fdba | 1804 | /* Process information from new template parameter NEXT and append it to the |
5566b478 | 1805 | LIST being built. */ |
e92cc029 | 1806 | |
8d08fdba MS |
1807 | tree |
1808 | process_template_parm (list, next) | |
1809 | tree list, next; | |
1810 | { | |
1811 | tree parm; | |
1812 | tree decl = 0; | |
a292b002 | 1813 | tree defval; |
5566b478 | 1814 | int is_type, idx; |
f84b4be9 | 1815 | |
8d08fdba MS |
1816 | parm = next; |
1817 | my_friendly_assert (TREE_CODE (parm) == TREE_LIST, 259); | |
a292b002 MS |
1818 | defval = TREE_PURPOSE (parm); |
1819 | parm = TREE_VALUE (parm); | |
1820 | is_type = TREE_PURPOSE (parm) == class_type_node; | |
5566b478 MS |
1821 | |
1822 | if (list) | |
1823 | { | |
1824 | tree p = TREE_VALUE (tree_last (list)); | |
1825 | ||
1899c3a4 | 1826 | if (TREE_CODE (p) == TYPE_DECL || TREE_CODE (p) == TEMPLATE_DECL) |
5566b478 MS |
1827 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p)); |
1828 | else | |
f84b4be9 | 1829 | idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p)); |
5566b478 MS |
1830 | ++idx; |
1831 | } | |
1832 | else | |
1833 | idx = 0; | |
1834 | ||
8d08fdba MS |
1835 | if (!is_type) |
1836 | { | |
a292b002 | 1837 | my_friendly_assert (TREE_CODE (TREE_PURPOSE (parm)) == TREE_LIST, 260); |
8d08fdba | 1838 | /* is a const-param */ |
a292b002 | 1839 | parm = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), |
c11b6f21 | 1840 | PARM, 0, NULL_TREE); |
d490621d MM |
1841 | |
1842 | /* [temp.param] | |
1843 | ||
1844 | The top-level cv-qualifiers on the template-parameter are | |
1845 | ignored when determining its type. */ | |
1846 | TREE_TYPE (parm) = TYPE_MAIN_VARIANT (TREE_TYPE (parm)); | |
1847 | ||
8d08fdba MS |
1848 | /* A template parameter is not modifiable. */ |
1849 | TREE_READONLY (parm) = 1; | |
c91a56d2 | 1850 | if (IS_AGGR_TYPE (TREE_TYPE (parm)) |
410c2fba KL |
1851 | && TREE_CODE (TREE_TYPE (parm)) != TEMPLATE_TYPE_PARM |
1852 | && TREE_CODE (TREE_TYPE (parm)) != TYPENAME_TYPE) | |
8d08fdba | 1853 | { |
8251199e | 1854 | cp_error ("`%#T' is not a valid type for a template constant parameter", |
c91a56d2 MS |
1855 | TREE_TYPE (parm)); |
1856 | if (DECL_NAME (parm) == NULL_TREE) | |
8251199e | 1857 | error (" a template type parameter must begin with `class' or `typename'"); |
8d08fdba MS |
1858 | TREE_TYPE (parm) = void_type_node; |
1859 | } | |
37c46b43 MS |
1860 | else if (pedantic |
1861 | && (TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE | |
1862 | || TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE)) | |
8251199e | 1863 | cp_pedwarn ("`%T' is not a valid type for a template constant parameter", |
eb66be0e | 1864 | TREE_TYPE (parm)); |
8d08fdba | 1865 | decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm)); |
f84b4be9 JM |
1866 | DECL_INITIAL (parm) = DECL_INITIAL (decl) |
1867 | = build_template_parm_index (idx, processing_template_decl, | |
1868 | processing_template_decl, | |
1869 | decl, TREE_TYPE (parm)); | |
8d08fdba MS |
1870 | } |
1871 | else | |
1872 | { | |
73b0fce8 KL |
1873 | tree t; |
1874 | parm = TREE_VALUE (parm); | |
1875 | ||
1876 | if (parm && TREE_CODE (parm) == TEMPLATE_DECL) | |
1877 | { | |
33848bb0 | 1878 | t = make_aggr_type (TEMPLATE_TEMPLATE_PARM); |
73b0fce8 KL |
1879 | /* This is for distinguishing between real templates and template |
1880 | template parameters */ | |
1881 | TREE_TYPE (parm) = t; | |
1882 | TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t; | |
1883 | decl = parm; | |
1884 | } | |
1885 | else | |
1886 | { | |
33848bb0 | 1887 | t = make_aggr_type (TEMPLATE_TYPE_PARM); |
73b0fce8 KL |
1888 | /* parm is either IDENTIFIER_NODE or NULL_TREE */ |
1889 | decl = build_decl (TYPE_DECL, parm, t); | |
1890 | } | |
1891 | ||
d2e5ee5c MS |
1892 | TYPE_NAME (t) = decl; |
1893 | TYPE_STUB_DECL (t) = decl; | |
a292b002 | 1894 | parm = decl; |
f84b4be9 JM |
1895 | TEMPLATE_TYPE_PARM_INDEX (t) |
1896 | = build_template_parm_index (idx, processing_template_decl, | |
1897 | processing_template_decl, | |
1898 | decl, TREE_TYPE (parm)); | |
8d08fdba | 1899 | } |
c727aa5e | 1900 | DECL_ARTIFICIAL (decl) = 1; |
cd9f6678 | 1901 | SET_DECL_TEMPLATE_PARM_P (decl); |
8d08fdba | 1902 | pushdecl (decl); |
a292b002 | 1903 | parm = build_tree_list (defval, parm); |
8d08fdba MS |
1904 | return chainon (list, parm); |
1905 | } | |
1906 | ||
1907 | /* The end of a template parameter list has been reached. Process the | |
1908 | tree list into a parameter vector, converting each parameter into a more | |
1909 | useful form. Type parameters are saved as IDENTIFIER_NODEs, and others | |
1910 | as PARM_DECLs. */ | |
1911 | ||
1912 | tree | |
1913 | end_template_parm_list (parms) | |
1914 | tree parms; | |
1915 | { | |
5566b478 | 1916 | int nparms; |
8d08fdba | 1917 | tree parm; |
5566b478 MS |
1918 | tree saved_parmlist = make_tree_vec (list_length (parms)); |
1919 | ||
5566b478 MS |
1920 | current_template_parms |
1921 | = tree_cons (build_int_2 (0, processing_template_decl), | |
1922 | saved_parmlist, current_template_parms); | |
8d08fdba | 1923 | |
91e490ab MM |
1924 | for (parm = parms, nparms = 0; |
1925 | parm; | |
1926 | parm = TREE_CHAIN (parm), nparms++) | |
66191c20 | 1927 | TREE_VEC_ELT (saved_parmlist, nparms) = parm; |
a292b002 | 1928 | |
67ffc812 MM |
1929 | --processing_template_parmlist; |
1930 | ||
8d08fdba MS |
1931 | return saved_parmlist; |
1932 | } | |
1933 | ||
5566b478 MS |
1934 | /* end_template_decl is called after a template declaration is seen. */ |
1935 | ||
8d08fdba | 1936 | void |
5566b478 | 1937 | end_template_decl () |
8d08fdba | 1938 | { |
386b8a85 JM |
1939 | reset_specialization (); |
1940 | ||
5156628f | 1941 | if (! processing_template_decl) |
73aad9b9 JM |
1942 | return; |
1943 | ||
5566b478 | 1944 | /* This matches the pushlevel in begin_template_parm_list. */ |
74b846e0 | 1945 | finish_scope (); |
8d08fdba | 1946 | |
5566b478 MS |
1947 | --processing_template_decl; |
1948 | current_template_parms = TREE_CHAIN (current_template_parms); | |
5566b478 | 1949 | } |
8d08fdba | 1950 | |
36a117a5 MM |
1951 | /* Given a template argument vector containing the template PARMS. |
1952 | The innermost PARMS are given first. */ | |
9a3b49ac MS |
1953 | |
1954 | tree | |
1955 | current_template_args () | |
5566b478 | 1956 | { |
36a117a5 | 1957 | tree header; |
b370501f | 1958 | tree args = NULL_TREE; |
36a117a5 | 1959 | int length = TMPL_PARMS_DEPTH (current_template_parms); |
98c1c668 JM |
1960 | int l = length; |
1961 | ||
36a117a5 MM |
1962 | /* If there is only one level of template parameters, we do not |
1963 | create a TREE_VEC of TREE_VECs. Instead, we return a single | |
1964 | TREE_VEC containing the arguments. */ | |
1965 | if (length > 1) | |
1966 | args = make_tree_vec (length); | |
1967 | ||
1968 | for (header = current_template_parms; header; header = TREE_CHAIN (header)) | |
8d08fdba | 1969 | { |
5566b478 | 1970 | tree a = copy_node (TREE_VALUE (header)); |
36a117a5 MM |
1971 | int i; |
1972 | ||
5566b478 | 1973 | TREE_TYPE (a) = NULL_TREE; |
36a117a5 | 1974 | for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i) |
5566b478 | 1975 | { |
98c1c668 JM |
1976 | tree t = TREE_VEC_ELT (a, i); |
1977 | ||
36a117a5 | 1978 | /* T will be a list if we are called from within a |
98c1c668 JM |
1979 | begin/end_template_parm_list pair, but a vector directly |
1980 | if within a begin/end_member_template_processing pair. */ | |
1981 | if (TREE_CODE (t) == TREE_LIST) | |
1982 | { | |
1983 | t = TREE_VALUE (t); | |
1984 | ||
73b0fce8 KL |
1985 | if (TREE_CODE (t) == TYPE_DECL |
1986 | || TREE_CODE (t) == TEMPLATE_DECL) | |
98c1c668 JM |
1987 | t = TREE_TYPE (t); |
1988 | else | |
1989 | t = DECL_INITIAL (t); | |
36a117a5 | 1990 | TREE_VEC_ELT (a, i) = t; |
98c1c668 | 1991 | } |
5566b478 | 1992 | } |
36a117a5 MM |
1993 | |
1994 | if (length > 1) | |
1995 | TREE_VEC_ELT (args, --l) = a; | |
1996 | else | |
1997 | args = a; | |
8d08fdba MS |
1998 | } |
1999 | ||
9a3b49ac MS |
2000 | return args; |
2001 | } | |
75650646 | 2002 | |
e1467ff2 MM |
2003 | /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated |
2004 | template PARMS. Used by push_template_decl below. */ | |
2005 | ||
75650646 MM |
2006 | static tree |
2007 | build_template_decl (decl, parms) | |
2008 | tree decl; | |
2009 | tree parms; | |
2010 | { | |
2011 | tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE); | |
2012 | DECL_TEMPLATE_PARMS (tmpl) = parms; | |
2013 | DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl); | |
2014 | if (DECL_LANG_SPECIFIC (decl)) | |
2015 | { | |
8f17b5c5 MM |
2016 | if (CAN_HAVE_FULL_LANG_DECL_P (decl)) |
2017 | DECL_VIRTUAL_CONTEXT (tmpl) = DECL_VIRTUAL_CONTEXT (decl); | |
8f032717 MM |
2018 | DECL_STATIC_FUNCTION_P (tmpl) = DECL_STATIC_FUNCTION_P (decl); |
2019 | DECL_CONSTRUCTOR_P (tmpl) = DECL_CONSTRUCTOR_P (decl); | |
11f98788 | 2020 | DECL_NONCONVERTING_P (tmpl) = DECL_NONCONVERTING_P (decl); |
1f6e1acc AS |
2021 | DECL_ASSIGNMENT_OPERATOR_P (tmpl) = DECL_ASSIGNMENT_OPERATOR_P (decl); |
2022 | if (DECL_OVERLOADED_OPERATOR_P (decl)) | |
2023 | SET_OVERLOADED_OPERATOR_CODE (tmpl, | |
2024 | DECL_OVERLOADED_OPERATOR_P (decl)); | |
75650646 MM |
2025 | } |
2026 | ||
2027 | return tmpl; | |
2028 | } | |
2029 | ||
050367a3 MM |
2030 | struct template_parm_data |
2031 | { | |
6c30752f MM |
2032 | /* The level of the template parameters we are currently |
2033 | processing. */ | |
050367a3 | 2034 | int level; |
6c30752f MM |
2035 | |
2036 | /* The index of the specialization argument we are currently | |
2037 | processing. */ | |
2038 | int current_arg; | |
2039 | ||
2040 | /* An array whose size is the number of template parameters. The | |
2041 | elements are non-zero if the parameter has been used in any one | |
2042 | of the arguments processed so far. */ | |
050367a3 | 2043 | int* parms; |
6c30752f MM |
2044 | |
2045 | /* An array whose size is the number of template arguments. The | |
2046 | elements are non-zero if the argument makes use of template | |
2047 | parameters of this level. */ | |
2048 | int* arg_uses_template_parms; | |
050367a3 MM |
2049 | }; |
2050 | ||
2051 | /* Subroutine of push_template_decl used to see if each template | |
2052 | parameter in a partial specialization is used in the explicit | |
2053 | argument list. If T is of the LEVEL given in DATA (which is | |
2054 | treated as a template_parm_data*), then DATA->PARMS is marked | |
2055 | appropriately. */ | |
2056 | ||
2057 | static int | |
2058 | mark_template_parm (t, data) | |
2059 | tree t; | |
2060 | void* data; | |
2061 | { | |
2062 | int level; | |
2063 | int idx; | |
2064 | struct template_parm_data* tpd = (struct template_parm_data*) data; | |
2065 | ||
2066 | if (TREE_CODE (t) == TEMPLATE_PARM_INDEX) | |
2067 | { | |
2068 | level = TEMPLATE_PARM_LEVEL (t); | |
2069 | idx = TEMPLATE_PARM_IDX (t); | |
2070 | } | |
2071 | else | |
2072 | { | |
2073 | level = TEMPLATE_TYPE_LEVEL (t); | |
2074 | idx = TEMPLATE_TYPE_IDX (t); | |
2075 | } | |
2076 | ||
2077 | if (level == tpd->level) | |
6c30752f MM |
2078 | { |
2079 | tpd->parms[idx] = 1; | |
2080 | tpd->arg_uses_template_parms[tpd->current_arg] = 1; | |
2081 | } | |
050367a3 MM |
2082 | |
2083 | /* Return zero so that for_each_template_parm will continue the | |
2084 | traversal of the tree; we want to mark *every* template parm. */ | |
2085 | return 0; | |
2086 | } | |
2087 | ||
6c30752f MM |
2088 | /* Process the partial specialization DECL. */ |
2089 | ||
e9659ab0 | 2090 | static tree |
6c30752f MM |
2091 | process_partial_specialization (decl) |
2092 | tree decl; | |
2093 | { | |
2094 | tree type = TREE_TYPE (decl); | |
2095 | tree maintmpl = CLASSTYPE_TI_TEMPLATE (type); | |
2096 | tree specargs = CLASSTYPE_TI_ARGS (type); | |
f9a7ae04 | 2097 | tree inner_args = INNERMOST_TEMPLATE_ARGS (specargs); |
6c30752f MM |
2098 | tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms); |
2099 | tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl); | |
2100 | int nargs = TREE_VEC_LENGTH (inner_args); | |
2101 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2102 | int i; | |
2103 | int did_error_intro = 0; | |
6c30752f MM |
2104 | struct template_parm_data tpd; |
2105 | struct template_parm_data tpd2; | |
2106 | ||
6c30752f MM |
2107 | /* We check that each of the template parameters given in the |
2108 | partial specialization is used in the argument list to the | |
2109 | specialization. For example: | |
2110 | ||
2111 | template <class T> struct S; | |
2112 | template <class T> struct S<T*>; | |
2113 | ||
2114 | The second declaration is OK because `T*' uses the template | |
2115 | parameter T, whereas | |
2116 | ||
2117 | template <class T> struct S<int>; | |
2118 | ||
2119 | is no good. Even trickier is: | |
2120 | ||
2121 | template <class T> | |
2122 | struct S1 | |
2123 | { | |
2124 | template <class U> | |
2125 | struct S2; | |
2126 | template <class U> | |
2127 | struct S2<T>; | |
2128 | }; | |
2129 | ||
2130 | The S2<T> declaration is actually illegal; it is a | |
2131 | full-specialization. Of course, | |
2132 | ||
2133 | template <class U> | |
2134 | struct S2<T (*)(U)>; | |
2135 | ||
2136 | or some such would have been OK. */ | |
2137 | tpd.level = TMPL_PARMS_DEPTH (current_template_parms); | |
2138 | tpd.parms = alloca (sizeof (int) * ntparms); | |
961192e1 | 2139 | memset ((PTR) tpd.parms, 0, sizeof (int) * ntparms); |
6c30752f MM |
2140 | |
2141 | tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs); | |
961192e1 | 2142 | memset ((PTR) tpd.arg_uses_template_parms, 0, sizeof (int) * nargs); |
6c30752f MM |
2143 | for (i = 0; i < nargs; ++i) |
2144 | { | |
2145 | tpd.current_arg = i; | |
2146 | for_each_template_parm (TREE_VEC_ELT (inner_args, i), | |
2147 | &mark_template_parm, | |
2148 | &tpd); | |
2149 | } | |
2150 | for (i = 0; i < ntparms; ++i) | |
2151 | if (tpd.parms[i] == 0) | |
2152 | { | |
2153 | /* One of the template parms was not used in the | |
f9a7ae04 | 2154 | specialization. */ |
6c30752f MM |
2155 | if (!did_error_intro) |
2156 | { | |
8251199e | 2157 | cp_error ("template parameters not used in partial specialization:"); |
6c30752f MM |
2158 | did_error_intro = 1; |
2159 | } | |
2160 | ||
8251199e | 2161 | cp_error (" `%D'", |
6c30752f MM |
2162 | TREE_VALUE (TREE_VEC_ELT (inner_parms, i))); |
2163 | } | |
2164 | ||
2165 | /* [temp.class.spec] | |
2166 | ||
2167 | The argument list of the specialization shall not be identical to | |
2168 | the implicit argument list of the primary template. */ | |
f9a7ae04 MM |
2169 | if (comp_template_args |
2170 | (inner_args, | |
2171 | INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE | |
2172 | (maintmpl))))) | |
8251199e | 2173 | cp_error ("partial specialization `%T' does not specialize any template arguments", type); |
6c30752f MM |
2174 | |
2175 | /* [temp.class.spec] | |
2176 | ||
2177 | A partially specialized non-type argument expression shall not | |
2178 | involve template parameters of the partial specialization except | |
2179 | when the argument expression is a simple identifier. | |
2180 | ||
2181 | The type of a template parameter corresponding to a specialized | |
2182 | non-type argument shall not be dependent on a parameter of the | |
2183 | specialization. */ | |
2184 | my_friendly_assert (nargs == DECL_NTPARMS (maintmpl), 0); | |
2185 | tpd2.parms = 0; | |
2186 | for (i = 0; i < nargs; ++i) | |
2187 | { | |
2188 | tree arg = TREE_VEC_ELT (inner_args, i); | |
2189 | if (/* These first two lines are the `non-type' bit. */ | |
2f939d94 | 2190 | !TYPE_P (arg) |
6c30752f MM |
2191 | && TREE_CODE (arg) != TEMPLATE_DECL |
2192 | /* This next line is the `argument expression is not just a | |
2193 | simple identifier' condition and also the `specialized | |
2194 | non-type argument' bit. */ | |
2195 | && TREE_CODE (arg) != TEMPLATE_PARM_INDEX) | |
2196 | { | |
2197 | if (tpd.arg_uses_template_parms[i]) | |
8251199e | 2198 | cp_error ("template argument `%E' involves template parameter(s)", arg); |
6c30752f MM |
2199 | else |
2200 | { | |
2201 | /* Look at the corresponding template parameter, | |
2202 | marking which template parameters its type depends | |
2203 | upon. */ | |
2204 | tree type = | |
2205 | TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms, | |
2206 | i))); | |
2207 | ||
2208 | if (!tpd2.parms) | |
2209 | { | |
2210 | /* We haven't yet initialized TPD2. Do so now. */ | |
2211 | tpd2.arg_uses_template_parms | |
2212 | = (int*) alloca (sizeof (int) * nargs); | |
104bf76a | 2213 | /* The number of parameters here is the number in the |
76a83782 RH |
2214 | main template, which, as checked in the assertion |
2215 | above, is NARGS. */ | |
6c30752f MM |
2216 | tpd2.parms = (int*) alloca (sizeof (int) * nargs); |
2217 | tpd2.level = | |
2218 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl)); | |
2219 | } | |
2220 | ||
104bf76a | 2221 | /* Mark the template parameters. But this time, we're |
6c30752f MM |
2222 | looking for the template parameters of the main |
2223 | template, not in the specialization. */ | |
2224 | tpd2.current_arg = i; | |
2225 | tpd2.arg_uses_template_parms[i] = 0; | |
961192e1 | 2226 | memset ((PTR) tpd2.parms, 0, sizeof (int) * nargs); |
6c30752f MM |
2227 | for_each_template_parm (type, |
2228 | &mark_template_parm, | |
2229 | &tpd2); | |
2230 | ||
2231 | if (tpd2.arg_uses_template_parms [i]) | |
2232 | { | |
2233 | /* The type depended on some template parameters. | |
2234 | If they are fully specialized in the | |
2235 | specialization, that's OK. */ | |
2236 | int j; | |
2237 | for (j = 0; j < nargs; ++j) | |
2238 | if (tpd2.parms[j] != 0 | |
2239 | && tpd.arg_uses_template_parms [j]) | |
2240 | { | |
104bf76a | 2241 | cp_error ("type `%T' of template argument `%E' depends on template parameter(s)", |
6c30752f MM |
2242 | type, |
2243 | arg); | |
2244 | break; | |
2245 | } | |
2246 | } | |
2247 | } | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | if (retrieve_specialization (maintmpl, specargs)) | |
2252 | /* We've already got this specialization. */ | |
2253 | return decl; | |
2254 | ||
d8b64f80 | 2255 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl) |
e1b3e07d MM |
2256 | = tree_cons (inner_args, inner_parms, |
2257 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)); | |
6c30752f MM |
2258 | TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type; |
2259 | return decl; | |
2260 | } | |
2261 | ||
6ba89f8e MM |
2262 | /* Check that a template declaration's use of default arguments is not |
2263 | invalid. Here, PARMS are the template parameters. IS_PRIMARY is | |
2264 | non-zero if DECL is the thing declared by a primary template. | |
2265 | IS_PARTIAL is non-zero if DECL is a partial specialization. */ | |
2266 | ||
2267 | static void | |
2268 | check_default_tmpl_args (decl, parms, is_primary, is_partial) | |
2269 | tree decl; | |
2270 | tree parms; | |
2271 | int is_primary; | |
2272 | int is_partial; | |
2273 | { | |
d8e178a0 | 2274 | const char *msg; |
66191c20 MM |
2275 | int last_level_to_check; |
2276 | tree parm_level; | |
6ba89f8e MM |
2277 | |
2278 | /* [temp.param] | |
2279 | ||
2280 | A default template-argument shall not be specified in a | |
2281 | function template declaration or a function template definition, nor | |
2282 | in the template-parameter-list of the definition of a member of a | |
2283 | class template. */ | |
2284 | ||
4f1c5b7d | 2285 | if (TREE_CODE (CP_DECL_CONTEXT (decl)) == FUNCTION_DECL) |
e0942dcd MM |
2286 | /* You can't have a function template declaration in a local |
2287 | scope, nor you can you define a member of a class template in a | |
2288 | local scope. */ | |
2289 | return; | |
2290 | ||
6ba89f8e MM |
2291 | if (current_class_type |
2292 | && !TYPE_BEING_DEFINED (current_class_type) | |
3d7de1fa | 2293 | && DECL_LANG_SPECIFIC (decl) |
5937a6f9 MM |
2294 | /* If this is either a friend defined in the scope of the class |
2295 | or a member function. */ | |
4f1c5b7d MM |
2296 | && ((DECL_CONTEXT (decl) |
2297 | && same_type_p (DECL_CONTEXT (decl), current_class_type)) | |
2298 | || (DECL_FRIEND_CONTEXT (decl) | |
2299 | && same_type_p (DECL_FRIEND_CONTEXT (decl), | |
2300 | current_class_type))) | |
5937a6f9 MM |
2301 | /* And, if it was a member function, it really was defined in |
2302 | the scope of the class. */ | |
2303 | && (!DECL_FUNCTION_MEMBER_P (decl) || DECL_DEFINED_IN_CLASS_P (decl))) | |
6ba89f8e | 2304 | /* We already checked these parameters when the template was |
5937a6f9 MM |
2305 | declared, so there's no need to do it again now. This function |
2306 | was defined in class scope, but we're processing it's body now | |
2307 | that the class is complete. */ | |
6ba89f8e MM |
2308 | return; |
2309 | ||
66191c20 MM |
2310 | /* [temp.param] |
2311 | ||
2312 | If a template-parameter has a default template-argument, all | |
2313 | subsequent template-parameters shall have a default | |
2314 | template-argument supplied. */ | |
2315 | for (parm_level = parms; parm_level; parm_level = TREE_CHAIN (parm_level)) | |
2316 | { | |
2317 | tree inner_parms = TREE_VALUE (parm_level); | |
2318 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2319 | int seen_def_arg_p = 0; | |
2320 | int i; | |
2321 | ||
2322 | for (i = 0; i < ntparms; ++i) | |
2323 | { | |
2324 | tree parm = TREE_VEC_ELT (inner_parms, i); | |
2325 | if (TREE_PURPOSE (parm)) | |
2326 | seen_def_arg_p = 1; | |
2327 | else if (seen_def_arg_p) | |
2328 | { | |
2329 | cp_error ("no default argument for `%D'", TREE_VALUE (parm)); | |
2330 | /* For better subsequent error-recovery, we indicate that | |
2331 | there should have been a default argument. */ | |
2332 | TREE_PURPOSE (parm) = error_mark_node; | |
2333 | } | |
2334 | } | |
2335 | } | |
2336 | ||
6ba89f8e MM |
2337 | if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary) |
2338 | /* For an ordinary class template, default template arguments are | |
2339 | allowed at the innermost level, e.g.: | |
2340 | template <class T = int> | |
2341 | struct S {}; | |
2342 | but, in a partial specialization, they're not allowed even | |
2343 | there, as we have in [temp.class.spec]: | |
2344 | ||
2345 | The template parameter list of a specialization shall not | |
2346 | contain default template argument values. | |
2347 | ||
2348 | So, for a partial specialization, or for a function template, | |
2349 | we look at all of them. */ | |
2350 | ; | |
2351 | else | |
2352 | /* But, for a primary class template that is not a partial | |
2353 | specialization we look at all template parameters except the | |
2354 | innermost ones. */ | |
2355 | parms = TREE_CHAIN (parms); | |
2356 | ||
2357 | /* Figure out what error message to issue. */ | |
2358 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
2359 | msg = "default argument for template parameter in function template `%D'"; | |
2360 | else if (is_partial) | |
2361 | msg = "default argument in partial specialization `%D'"; | |
2362 | else | |
2363 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2364 | ||
2365 | if (current_class_type && TYPE_BEING_DEFINED (current_class_type)) | |
2366 | /* If we're inside a class definition, there's no need to | |
104bf76a | 2367 | examine the parameters to the class itself. On the one |
6ba89f8e MM |
2368 | hand, they will be checked when the class is defined, and, |
2369 | on the other, default arguments are legal in things like: | |
2370 | template <class T = double> | |
2371 | struct S { template <class U> void f(U); }; | |
2372 | Here the default argument for `S' has no bearing on the | |
2373 | declaration of `f'. */ | |
2374 | last_level_to_check = template_class_depth (current_class_type) + 1; | |
2375 | else | |
2376 | /* Check everything. */ | |
2377 | last_level_to_check = 0; | |
2378 | ||
66191c20 MM |
2379 | for (parm_level = parms; |
2380 | parm_level && TMPL_PARMS_DEPTH (parm_level) >= last_level_to_check; | |
2381 | parm_level = TREE_CHAIN (parm_level)) | |
6ba89f8e | 2382 | { |
66191c20 MM |
2383 | tree inner_parms = TREE_VALUE (parm_level); |
2384 | int i; | |
2385 | int ntparms; | |
6ba89f8e MM |
2386 | |
2387 | ntparms = TREE_VEC_LENGTH (inner_parms); | |
2388 | for (i = 0; i < ntparms; ++i) | |
2389 | if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i))) | |
2390 | { | |
2391 | if (msg) | |
2392 | { | |
2393 | cp_error (msg, decl); | |
2394 | msg = 0; | |
2395 | } | |
2396 | ||
2397 | /* Clear out the default argument so that we are not | |
2398 | confused later. */ | |
2399 | TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE; | |
2400 | } | |
2401 | ||
2402 | /* At this point, if we're still interested in issuing messages, | |
2403 | they must apply to classes surrounding the object declared. */ | |
2404 | if (msg) | |
2405 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2406 | } | |
2407 | } | |
2408 | ||
3ac3d9ea | 2409 | /* Creates a TEMPLATE_DECL for the indicated DECL using the template |
f84b4be9 JM |
2410 | parameters given by current_template_args, or reuses a |
2411 | previously existing one, if appropriate. Returns the DECL, or an | |
6757edfe MM |
2412 | equivalent one, if it is replaced via a call to duplicate_decls. |
2413 | ||
2414 | If IS_FRIEND is non-zero, DECL is a friend declaration. */ | |
3ac3d9ea MM |
2415 | |
2416 | tree | |
6757edfe | 2417 | push_template_decl_real (decl, is_friend) |
9a3b49ac | 2418 | tree decl; |
6757edfe | 2419 | int is_friend; |
9a3b49ac MS |
2420 | { |
2421 | tree tmpl; | |
f84b4be9 | 2422 | tree args; |
9a3b49ac | 2423 | tree info; |
f84b4be9 JM |
2424 | tree ctx; |
2425 | int primary; | |
6ba89f8e | 2426 | int is_partial; |
cfe507be | 2427 | int new_template_p = 0; |
6ba89f8e MM |
2428 | |
2429 | /* See if this is a partial specialization. */ | |
9188c363 | 2430 | is_partial = (DECL_IMPLICIT_TYPEDEF_P (decl) |
6ba89f8e | 2431 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE |
370af2d5 | 2432 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl))); |
6757edfe MM |
2433 | |
2434 | is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl)); | |
f84b4be9 JM |
2435 | |
2436 | if (is_friend) | |
2437 | /* For a friend, we want the context of the friend function, not | |
2438 | the type of which it is a friend. */ | |
2439 | ctx = DECL_CONTEXT (decl); | |
4f1c5b7d MM |
2440 | else if (CP_DECL_CONTEXT (decl) |
2441 | && TREE_CODE (CP_DECL_CONTEXT (decl)) != NAMESPACE_DECL) | |
f84b4be9 JM |
2442 | /* In the case of a virtual function, we want the class in which |
2443 | it is defined. */ | |
4f1c5b7d | 2444 | ctx = CP_DECL_CONTEXT (decl); |
f84b4be9 | 2445 | else |
dc957d14 | 2446 | /* Otherwise, if we're currently defining some class, the DECL |
f84b4be9 | 2447 | is assumed to be a member of the class. */ |
9188c363 | 2448 | ctx = current_scope (); |
f84b4be9 | 2449 | |
2c73f9f5 ML |
2450 | if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL) |
2451 | ctx = NULL_TREE; | |
2452 | ||
2453 | if (!DECL_CONTEXT (decl)) | |
cb0dbb9a | 2454 | DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace); |
2c73f9f5 | 2455 | |
6ba89f8e | 2456 | /* See if this is a primary template. */ |
74b846e0 | 2457 | primary = template_parm_scope_p (); |
9a3b49ac | 2458 | |
83566abf JM |
2459 | if (primary) |
2460 | { | |
2461 | if (current_lang_name == lang_name_c) | |
8251199e | 2462 | cp_error ("template with C linkage"); |
4ce3d537 MM |
2463 | else if (TREE_CODE (decl) == TYPE_DECL |
2464 | && ANON_AGGRNAME_P (DECL_NAME (decl))) | |
8251199e | 2465 | cp_error ("template class without a name"); |
2aaf816d JM |
2466 | else if ((DECL_IMPLICIT_TYPEDEF_P (decl) |
2467 | && CLASS_TYPE_P (TREE_TYPE (decl))) | |
2468 | || (TREE_CODE (decl) == VAR_DECL && ctx && CLASS_TYPE_P (ctx)) | |
2469 | || TREE_CODE (decl) == FUNCTION_DECL) | |
2470 | /* OK */; | |
2471 | else | |
4ce3d537 | 2472 | cp_error ("template declaration of `%#D'", decl); |
83566abf JM |
2473 | } |
2474 | ||
6ba89f8e MM |
2475 | /* Check to see that the rules regarding the use of default |
2476 | arguments are not being violated. */ | |
2477 | check_default_tmpl_args (decl, current_template_parms, | |
2478 | primary, is_partial); | |
73aad9b9 | 2479 | |
6ba89f8e MM |
2480 | if (is_partial) |
2481 | return process_partial_specialization (decl); | |
d32789d8 | 2482 | |
9a3b49ac MS |
2483 | args = current_template_args (); |
2484 | ||
f84b4be9 JM |
2485 | if (!ctx |
2486 | || TREE_CODE (ctx) == FUNCTION_DECL | |
2487 | || TYPE_BEING_DEFINED (ctx) | |
2488 | || (is_friend && !DECL_TEMPLATE_INFO (decl))) | |
8d08fdba | 2489 | { |
75650646 | 2490 | if (DECL_LANG_SPECIFIC (decl) |
f84b4be9 JM |
2491 | && DECL_TEMPLATE_INFO (decl) |
2492 | && DECL_TI_TEMPLATE (decl)) | |
2493 | tmpl = DECL_TI_TEMPLATE (decl); | |
1c10870d AS |
2494 | /* If DECL is a TYPE_DECL for a class-template, then there won't |
2495 | be DECL_LANG_SPECIFIC. The information equivalent to | |
2496 | DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */ | |
2497 | else if (DECL_IMPLICIT_TYPEDEF_P (decl) | |
2498 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2499 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2500 | { | |
2501 | /* Since a template declaration already existed for this | |
2502 | class-type, we must be redeclaring it here. Make sure | |
2503 | that the redeclaration is legal. */ | |
2504 | redeclare_class_template (TREE_TYPE (decl), | |
2505 | current_template_parms); | |
2506 | /* We don't need to create a new TEMPLATE_DECL; just use the | |
2507 | one we already had. */ | |
2508 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
2509 | } | |
f84b4be9 | 2510 | else |
786b5245 | 2511 | { |
f84b4be9 | 2512 | tmpl = build_template_decl (decl, current_template_parms); |
cfe507be MM |
2513 | new_template_p = 1; |
2514 | ||
f84b4be9 JM |
2515 | if (DECL_LANG_SPECIFIC (decl) |
2516 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
2517 | { | |
2518 | /* A specialization of a member template of a template | |
2519 | class. */ | |
2520 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
2521 | DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl); | |
2522 | DECL_TEMPLATE_INFO (decl) = NULL_TREE; | |
2523 | } | |
786b5245 | 2524 | } |
8d08fdba MS |
2525 | } |
2526 | else | |
2527 | { | |
e1a5ccf7 | 2528 | tree a, t, current, parms; |
ba4f4e5d | 2529 | int i; |
6633d636 | 2530 | |
6b9ab5cc MM |
2531 | if (TREE_CODE (decl) == TYPE_DECL) |
2532 | { | |
ed44da02 MM |
2533 | if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl))) |
2534 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
2535 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2536 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2537 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
6b9ab5cc MM |
2538 | else |
2539 | { | |
8251199e | 2540 | cp_error ("`%D' does not declare a template type", decl); |
6b9ab5cc MM |
2541 | return decl; |
2542 | } | |
2543 | } | |
fc378698 | 2544 | else if (! DECL_TEMPLATE_INFO (decl)) |
c91a56d2 | 2545 | { |
8251199e | 2546 | cp_error ("template definition of non-template `%#D'", decl); |
3ac3d9ea | 2547 | return decl; |
c91a56d2 | 2548 | } |
8d08fdba | 2549 | else |
5566b478 | 2550 | tmpl = DECL_TI_TEMPLATE (decl); |
98c1c668 | 2551 | |
e1a5ccf7 JM |
2552 | if (is_member_template (tmpl) |
2553 | && DECL_FUNCTION_TEMPLATE_P (tmpl) | |
2554 | && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl) | |
2555 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
98c1c668 | 2556 | { |
e1a5ccf7 JM |
2557 | tree new_tmpl; |
2558 | ||
2559 | /* The declaration is a specialization of a member | |
2560 | template, declared outside the class. Therefore, the | |
2561 | innermost template arguments will be NULL, so we | |
2562 | replace them with the arguments determined by the | |
2563 | earlier call to check_explicit_specialization. */ | |
2564 | args = DECL_TI_ARGS (decl); | |
2565 | ||
2566 | new_tmpl | |
2567 | = build_template_decl (decl, current_template_parms); | |
2568 | DECL_TEMPLATE_RESULT (new_tmpl) = decl; | |
2569 | TREE_TYPE (new_tmpl) = TREE_TYPE (decl); | |
2570 | DECL_TI_TEMPLATE (decl) = new_tmpl; | |
2571 | SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl); | |
e1b3e07d MM |
2572 | DECL_TEMPLATE_INFO (new_tmpl) |
2573 | = tree_cons (tmpl, args, NULL_TREE); | |
e1a5ccf7 | 2574 | |
f9a7ae04 MM |
2575 | register_specialization (new_tmpl, |
2576 | most_general_template (tmpl), | |
2577 | args); | |
e1a5ccf7 | 2578 | return decl; |
98c1c668 | 2579 | } |
98c1c668 | 2580 | |
e1a5ccf7 | 2581 | /* Make sure the template headers we got make sense. */ |
6633d636 | 2582 | |
e1a5ccf7 JM |
2583 | parms = DECL_TEMPLATE_PARMS (tmpl); |
2584 | i = TMPL_PARMS_DEPTH (parms); | |
2585 | if (TMPL_ARGS_DEPTH (args) != i) | |
98c1c668 | 2586 | { |
e1a5ccf7 JM |
2587 | cp_error ("expected %d levels of template parms for `%#D', got %d", |
2588 | i, decl, TMPL_ARGS_DEPTH (args)); | |
98c1c668 | 2589 | } |
e1a5ccf7 JM |
2590 | else |
2591 | for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms)) | |
2592 | { | |
2593 | a = TMPL_ARGS_LEVEL (args, i); | |
2594 | t = INNERMOST_TEMPLATE_PARMS (parms); | |
2595 | ||
2596 | if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a)) | |
2597 | { | |
2598 | if (current == decl) | |
2599 | cp_error ("got %d template parameters for `%#D'", | |
2600 | TREE_VEC_LENGTH (a), decl); | |
2601 | else | |
2602 | cp_error ("got %d template parameters for `%#T'", | |
2603 | TREE_VEC_LENGTH (a), current); | |
2604 | cp_error (" but %d required", TREE_VEC_LENGTH (t)); | |
2605 | } | |
98c1c668 | 2606 | |
e1a5ccf7 JM |
2607 | /* Perhaps we should also check that the parms are used in the |
2608 | appropriate qualifying scopes in the declarator? */ | |
6633d636 | 2609 | |
e1a5ccf7 JM |
2610 | if (current == decl) |
2611 | current = ctx; | |
2612 | else | |
2613 | current = TYPE_CONTEXT (current); | |
2614 | } | |
5566b478 | 2615 | } |
8d08fdba | 2616 | |
5566b478 MS |
2617 | DECL_TEMPLATE_RESULT (tmpl) = decl; |
2618 | TREE_TYPE (tmpl) = TREE_TYPE (decl); | |
8d08fdba | 2619 | |
36a117a5 MM |
2620 | /* Push template declarations for global functions and types. Note |
2621 | that we do not try to push a global template friend declared in a | |
2622 | template class; such a thing may well depend on the template | |
39c01e4c | 2623 | parameters of the class. */ |
cfe507be | 2624 | if (new_template_p && !ctx |
36a117a5 | 2625 | && !(is_friend && template_class_depth (current_class_type) > 0)) |
2c73f9f5 | 2626 | tmpl = pushdecl_namespace_level (tmpl); |
8d08fdba | 2627 | |
5566b478 | 2628 | if (primary) |
6757edfe | 2629 | DECL_PRIMARY_TEMPLATE (tmpl) = tmpl; |
5566b478 | 2630 | |
e1b3e07d | 2631 | info = tree_cons (tmpl, args, NULL_TREE); |
5566b478 | 2632 | |
9188c363 | 2633 | if (DECL_IMPLICIT_TYPEDEF_P (decl)) |
8d08fdba | 2634 | { |
ed44da02 MM |
2635 | SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info); |
2636 | if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL) | |
2637 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE) | |
75650646 | 2638 | DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl)); |
51c184be | 2639 | } |
2aaf816d | 2640 | else if (DECL_LANG_SPECIFIC (decl)) |
5566b478 | 2641 | DECL_TEMPLATE_INFO (decl) = info; |
3ac3d9ea MM |
2642 | |
2643 | return DECL_TEMPLATE_RESULT (tmpl); | |
8d08fdba MS |
2644 | } |
2645 | ||
6757edfe MM |
2646 | tree |
2647 | push_template_decl (decl) | |
2648 | tree decl; | |
2649 | { | |
2650 | return push_template_decl_real (decl, 0); | |
2651 | } | |
2652 | ||
2653 | /* Called when a class template TYPE is redeclared with the indicated | |
2654 | template PARMS, e.g.: | |
7fe6899f MM |
2655 | |
2656 | template <class T> struct S; | |
2657 | template <class T> struct S {}; */ | |
2658 | ||
2659 | void | |
6757edfe | 2660 | redeclare_class_template (type, parms) |
7fe6899f | 2661 | tree type; |
6757edfe | 2662 | tree parms; |
7fe6899f | 2663 | { |
3d7de1fa | 2664 | tree tmpl; |
6757edfe | 2665 | tree tmpl_parms; |
7fe6899f MM |
2666 | int i; |
2667 | ||
3d7de1fa MM |
2668 | if (!TYPE_TEMPLATE_INFO (type)) |
2669 | { | |
2670 | cp_error ("`%T' is not a template type", type); | |
2671 | return; | |
2672 | } | |
2673 | ||
2674 | tmpl = TYPE_TI_TEMPLATE (type); | |
7fe6899f MM |
2675 | if (!PRIMARY_TEMPLATE_P (tmpl)) |
2676 | /* The type is nested in some template class. Nothing to worry | |
2677 | about here; there are no new template parameters for the nested | |
2678 | type. */ | |
2679 | return; | |
2680 | ||
6757edfe MM |
2681 | parms = INNERMOST_TEMPLATE_PARMS (parms); |
2682 | tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl); | |
2683 | ||
7fe6899f MM |
2684 | if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms)) |
2685 | { | |
8251199e JM |
2686 | cp_error_at ("previous declaration `%D'", tmpl); |
2687 | cp_error ("used %d template parameter%s instead of %d", | |
7fe6899f MM |
2688 | TREE_VEC_LENGTH (tmpl_parms), |
2689 | TREE_VEC_LENGTH (tmpl_parms) == 1 ? "" : "s", | |
2690 | TREE_VEC_LENGTH (parms)); | |
2691 | return; | |
2692 | } | |
2693 | ||
2694 | for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i) | |
2695 | { | |
2696 | tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i)); | |
2697 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); | |
2698 | tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)); | |
2699 | tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i)); | |
2700 | ||
2701 | if (TREE_CODE (tmpl_parm) != TREE_CODE (parm)) | |
2702 | { | |
8251199e JM |
2703 | cp_error_at ("template parameter `%#D'", tmpl_parm); |
2704 | cp_error ("redeclared here as `%#D'", parm); | |
7fe6899f MM |
2705 | return; |
2706 | } | |
2707 | ||
2708 | if (tmpl_default != NULL_TREE && parm_default != NULL_TREE) | |
2709 | { | |
2710 | /* We have in [temp.param]: | |
2711 | ||
2712 | A template-parameter may not be given default arguments | |
2713 | by two different declarations in the same scope. */ | |
8251199e JM |
2714 | cp_error ("redefinition of default argument for `%#D'", parm); |
2715 | cp_error_at (" original definition appeared here", tmpl_parm); | |
7fe6899f MM |
2716 | return; |
2717 | } | |
2718 | ||
2719 | if (parm_default != NULL_TREE) | |
2720 | /* Update the previous template parameters (which are the ones | |
2721 | that will really count) with the new default value. */ | |
2722 | TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default; | |
7ce74c5e MM |
2723 | else if (tmpl_default != NULL_TREE) |
2724 | /* Update the new parameters, too; they'll be used as the | |
2725 | parameters for any members. */ | |
2726 | TREE_PURPOSE (TREE_VEC_ELT (parms, i)) = tmpl_default; | |
7fe6899f MM |
2727 | } |
2728 | } | |
75650646 | 2729 | |
75650646 MM |
2730 | /* Attempt to convert the non-type template parameter EXPR to the |
2731 | indicated TYPE. If the conversion is successful, return the | |
dc957d14 | 2732 | converted value. If the conversion is unsuccessful, return |
75650646 MM |
2733 | NULL_TREE if we issued an error message, or error_mark_node if we |
2734 | did not. We issue error messages for out-and-out bad template | |
2735 | parameters, but not simply because the conversion failed, since we | |
2736 | might be just trying to do argument deduction. By the time this | |
2737 | function is called, neither TYPE nor EXPR may make use of template | |
2738 | parameters. */ | |
2739 | ||
2740 | static tree | |
e1467ff2 | 2741 | convert_nontype_argument (type, expr) |
75650646 MM |
2742 | tree type; |
2743 | tree expr; | |
2744 | { | |
2745 | tree expr_type = TREE_TYPE (expr); | |
2746 | ||
2747 | /* A template-argument for a non-type, non-template | |
2748 | template-parameter shall be one of: | |
2749 | ||
2750 | --an integral constant-expression of integral or enumeration | |
2751 | type; or | |
2752 | ||
2753 | --the name of a non-type template-parameter; or | |
2754 | ||
2755 | --the name of an object or function with external linkage, | |
2756 | including function templates and function template-ids but | |
86052cc3 | 2757 | excluding non-static class members, expressed as id-expression; |
75650646 MM |
2758 | or |
2759 | ||
2760 | --the address of an object or function with external linkage, | |
2761 | including function templates and function template-ids but | |
2762 | excluding non-static class members, expressed as & id-expression | |
2763 | where the & is optional if the name refers to a function or | |
2764 | array; or | |
2765 | ||
2766 | --a pointer to member expressed as described in _expr.unary.op_. */ | |
2767 | ||
638dd8fc MM |
2768 | /* An integral constant-expression can include const variables or |
2769 | enumerators. Simplify things by folding them to their values, | |
2770 | unless we're about to bind the declaration to a reference | |
2771 | parameter. */ | |
fc611ce0 | 2772 | if (INTEGRAL_TYPE_P (expr_type) |
638dd8fc | 2773 | && TREE_CODE (type) != REFERENCE_TYPE) |
86052cc3 JM |
2774 | expr = decl_constant_value (expr); |
2775 | ||
7bf2682f MM |
2776 | if (is_overloaded_fn (expr)) |
2777 | /* OK for now. We'll check that it has external linkage later. | |
2778 | Check this first since if expr_type is the unknown_type_node | |
2779 | we would otherwise complain below. */ | |
2780 | ; | |
e08a8f45 MM |
2781 | else if (TYPE_PTRMEM_P (expr_type) |
2782 | || TYPE_PTRMEMFUNC_P (expr_type)) | |
2783 | { | |
2784 | if (TREE_CODE (expr) != PTRMEM_CST) | |
2785 | goto bad_argument; | |
2786 | } | |
f3400fe2 | 2787 | else if (TYPE_PTR_P (expr_type) |
e08a8f45 | 2788 | || TYPE_PTRMEM_P (expr_type) |
f3400fe2 JM |
2789 | || TREE_CODE (expr_type) == ARRAY_TYPE |
2790 | || TREE_CODE (type) == REFERENCE_TYPE | |
75650646 MM |
2791 | /* If expr is the address of an overloaded function, we |
2792 | will get the unknown_type_node at this point. */ | |
2793 | || expr_type == unknown_type_node) | |
2794 | { | |
2795 | tree referent; | |
49bf0d6f MM |
2796 | tree e = expr; |
2797 | STRIP_NOPS (e); | |
75650646 | 2798 | |
0dc09a61 MM |
2799 | if (TREE_CODE (expr_type) == ARRAY_TYPE |
2800 | || (TREE_CODE (type) == REFERENCE_TYPE | |
2801 | && TREE_CODE (e) != ADDR_EXPR)) | |
f3400fe2 JM |
2802 | referent = e; |
2803 | else | |
75650646 | 2804 | { |
f3400fe2 JM |
2805 | if (TREE_CODE (e) != ADDR_EXPR) |
2806 | { | |
2807 | bad_argument: | |
2808 | cp_error ("`%E' is not a valid template argument", expr); | |
e08a8f45 MM |
2809 | if (TYPE_PTR_P (expr_type)) |
2810 | { | |
2811 | if (TREE_CODE (TREE_TYPE (expr_type)) == FUNCTION_TYPE) | |
2812 | cp_error ("it must be the address of a function with external linkage"); | |
2813 | else | |
2814 | cp_error ("it must be the address of an object with external linkage"); | |
2815 | } | |
2816 | else if (TYPE_PTRMEM_P (expr_type) | |
2817 | || TYPE_PTRMEMFUNC_P (expr_type)) | |
2818 | cp_error ("it must be a pointer-to-member of the form `&X::Y'"); | |
2819 | ||
f3400fe2 JM |
2820 | return NULL_TREE; |
2821 | } | |
2822 | ||
2823 | referent = TREE_OPERAND (e, 0); | |
2824 | STRIP_NOPS (referent); | |
75650646 MM |
2825 | } |
2826 | ||
75650646 MM |
2827 | if (TREE_CODE (referent) == STRING_CST) |
2828 | { | |
b4f4233d | 2829 | cp_error ("string literal %E is not a valid template argument because it is the address of an object with static linkage", |
75650646 | 2830 | referent); |
75650646 MM |
2831 | return NULL_TREE; |
2832 | } | |
2833 | ||
2834 | if (is_overloaded_fn (referent)) | |
2835 | /* We'll check that it has external linkage later. */ | |
2836 | ; | |
2837 | else if (TREE_CODE (referent) != VAR_DECL) | |
2838 | goto bad_argument; | |
ad50e811 | 2839 | else if (!DECL_EXTERNAL_LINKAGE_P (referent)) |
75650646 | 2840 | { |
8251199e | 2841 | cp_error ("address of non-extern `%E' cannot be used as template argument", referent); |
75650646 MM |
2842 | return error_mark_node; |
2843 | } | |
2844 | } | |
f3400fe2 JM |
2845 | else if (INTEGRAL_TYPE_P (expr_type) |
2846 | || TYPE_PTRMEM_P (expr_type) | |
2847 | || TYPE_PTRMEMFUNC_P (expr_type) | |
2848 | /* The next two are g++ extensions. */ | |
2849 | || TREE_CODE (expr_type) == REAL_TYPE | |
2850 | || TREE_CODE (expr_type) == COMPLEX_TYPE) | |
75650646 | 2851 | { |
f3400fe2 JM |
2852 | if (! TREE_CONSTANT (expr)) |
2853 | { | |
2854 | non_constant: | |
2855 | cp_error ("non-constant `%E' cannot be used as template argument", | |
2856 | expr); | |
2857 | return NULL_TREE; | |
2858 | } | |
75650646 | 2859 | } |
75650646 MM |
2860 | else |
2861 | { | |
8251199e | 2862 | cp_error ("object `%E' cannot be used as template argument", expr); |
75650646 MM |
2863 | return NULL_TREE; |
2864 | } | |
2865 | ||
2866 | switch (TREE_CODE (type)) | |
2867 | { | |
2868 | case INTEGER_TYPE: | |
2869 | case BOOLEAN_TYPE: | |
2870 | case ENUMERAL_TYPE: | |
2871 | /* For a non-type template-parameter of integral or enumeration | |
2872 | type, integral promotions (_conv.prom_) and integral | |
2873 | conversions (_conv.integral_) are applied. */ | |
2874 | if (!INTEGRAL_TYPE_P (expr_type)) | |
2875 | return error_mark_node; | |
2876 | ||
2877 | /* It's safe to call digest_init in this case; we know we're | |
2878 | just converting one integral constant expression to another. */ | |
db02b6b9 | 2879 | expr = digest_init (type, expr, (tree*) 0); |
75650646 | 2880 | |
db02b6b9 | 2881 | if (TREE_CODE (expr) != INTEGER_CST) |
f3400fe2 | 2882 | /* Curiously, some TREE_CONSTANT integral expressions do not |
db02b6b9 MM |
2883 | simplify to integer constants. For example, `3 % 0', |
2884 | remains a TRUNC_MOD_EXPR. */ | |
2885 | goto non_constant; | |
2886 | ||
2887 | return expr; | |
2888 | ||
abff8e06 JM |
2889 | case REAL_TYPE: |
2890 | case COMPLEX_TYPE: | |
2891 | /* These are g++ extensions. */ | |
2892 | if (TREE_CODE (expr_type) != TREE_CODE (type)) | |
2893 | return error_mark_node; | |
2894 | ||
db02b6b9 MM |
2895 | expr = digest_init (type, expr, (tree*) 0); |
2896 | ||
2897 | if (TREE_CODE (expr) != REAL_CST) | |
2898 | goto non_constant; | |
2899 | ||
2900 | return expr; | |
abff8e06 | 2901 | |
75650646 MM |
2902 | case POINTER_TYPE: |
2903 | { | |
2904 | tree type_pointed_to = TREE_TYPE (type); | |
2905 | ||
2906 | if (TYPE_PTRMEM_P (type)) | |
93aa462d MM |
2907 | { |
2908 | tree e; | |
2909 | ||
2910 | /* For a non-type template-parameter of type pointer to data | |
2911 | member, qualification conversions (_conv.qual_) are | |
2912 | applied. */ | |
2913 | e = perform_qualification_conversions (type, expr); | |
2914 | if (TREE_CODE (e) == NOP_EXPR) | |
87533b37 MM |
2915 | /* The call to perform_qualification_conversions will |
2916 | insert a NOP_EXPR over EXPR to do express conversion, | |
2917 | if necessary. But, that will confuse us if we use | |
2918 | this (converted) template parameter to instantiate | |
2919 | another template; then the thing will not look like a | |
2920 | valid template argument. So, just make a new | |
2921 | constant, of the appropriate type. */ | |
2922 | e = make_ptrmem_cst (type, PTRMEM_CST_MEMBER (expr)); | |
93aa462d MM |
2923 | return e; |
2924 | } | |
75650646 MM |
2925 | else if (TREE_CODE (type_pointed_to) == FUNCTION_TYPE) |
2926 | { | |
2927 | /* For a non-type template-parameter of type pointer to | |
2928 | function, only the function-to-pointer conversion | |
2929 | (_conv.func_) is applied. If the template-argument | |
2930 | represents a set of overloaded functions (or a pointer to | |
2931 | such), the matching function is selected from the set | |
2932 | (_over.over_). */ | |
2933 | tree fns; | |
2934 | tree fn; | |
2935 | ||
7bf2682f | 2936 | if (TREE_CODE (expr) == ADDR_EXPR) |
75650646 MM |
2937 | fns = TREE_OPERAND (expr, 0); |
2938 | else | |
2939 | fns = expr; | |
2940 | ||
5e76004e | 2941 | fn = instantiate_type (type_pointed_to, fns, itf_none); |
75650646 MM |
2942 | |
2943 | if (fn == error_mark_node) | |
2944 | return error_mark_node; | |
2945 | ||
ad50e811 | 2946 | if (!DECL_EXTERNAL_LINKAGE_P (fn)) |
75650646 MM |
2947 | { |
2948 | if (really_overloaded_fn (fns)) | |
2949 | return error_mark_node; | |
2950 | else | |
2951 | goto bad_argument; | |
2952 | } | |
2953 | ||
2954 | expr = build_unary_op (ADDR_EXPR, fn, 0); | |
2955 | ||
3bfdc719 | 2956 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
2957 | 0); |
2958 | return expr; | |
2959 | } | |
2960 | else | |
2961 | { | |
2962 | /* For a non-type template-parameter of type pointer to | |
2963 | object, qualification conversions (_conv.qual_) and the | |
2964 | array-to-pointer conversion (_conv.array_) are applied. | |
2965 | [Note: In particular, neither the null pointer conversion | |
2966 | (_conv.ptr_) nor the derived-to-base conversion | |
2967 | (_conv.ptr_) are applied. Although 0 is a valid | |
2968 | template-argument for a non-type template-parameter of | |
2969 | integral type, it is not a valid template-argument for a | |
e1467ff2 MM |
2970 | non-type template-parameter of pointer type.] |
2971 | ||
2972 | The call to decay_conversion performs the | |
2973 | array-to-pointer conversion, if appropriate. */ | |
2974 | expr = decay_conversion (expr); | |
75650646 MM |
2975 | |
2976 | if (expr == error_mark_node) | |
2977 | return error_mark_node; | |
2978 | else | |
2979 | return perform_qualification_conversions (type, expr); | |
2980 | } | |
2981 | } | |
2982 | break; | |
2983 | ||
2984 | case REFERENCE_TYPE: | |
2985 | { | |
2986 | tree type_referred_to = TREE_TYPE (type); | |
2987 | ||
0dc09a61 MM |
2988 | /* If this expression already has reference type, get the |
2989 | underling object. */ | |
2990 | if (TREE_CODE (expr_type) == REFERENCE_TYPE) | |
2991 | { | |
2992 | my_friendly_assert (TREE_CODE (expr) == ADDR_EXPR, 20000604); | |
2993 | expr = TREE_OPERAND (expr, 0); | |
2994 | expr_type = TREE_TYPE (expr); | |
2995 | } | |
2996 | ||
75650646 MM |
2997 | if (TREE_CODE (type_referred_to) == FUNCTION_TYPE) |
2998 | { | |
2999 | /* For a non-type template-parameter of type reference to | |
39c01e4c MM |
3000 | function, no conversions apply. If the |
3001 | template-argument represents a set of overloaded | |
3002 | functions, the matching function is selected from the | |
3003 | set (_over.over_). */ | |
75650646 MM |
3004 | tree fn; |
3005 | ||
5e76004e | 3006 | fn = instantiate_type (type_referred_to, expr, itf_none); |
e6e174e5 JM |
3007 | |
3008 | if (fn == error_mark_node) | |
3009 | return error_mark_node; | |
75650646 | 3010 | |
ad50e811 | 3011 | if (!DECL_EXTERNAL_LINKAGE_P (fn)) |
75650646 | 3012 | { |
0dc09a61 | 3013 | if (really_overloaded_fn (expr)) |
75650646 MM |
3014 | /* Don't issue an error here; we might get a different |
3015 | function if the overloading had worked out | |
3016 | differently. */ | |
3017 | return error_mark_node; | |
3018 | else | |
3019 | goto bad_argument; | |
3020 | } | |
3021 | ||
3bfdc719 MM |
3022 | my_friendly_assert (same_type_p (type_referred_to, |
3023 | TREE_TYPE (fn)), | |
75650646 MM |
3024 | 0); |
3025 | ||
0dc09a61 | 3026 | expr = fn; |
75650646 MM |
3027 | } |
3028 | else | |
3029 | { | |
3030 | /* For a non-type template-parameter of type reference to | |
3031 | object, no conversions apply. The type referred to by the | |
3032 | reference may be more cv-qualified than the (otherwise | |
3033 | identical) type of the template-argument. The | |
3034 | template-parameter is bound directly to the | |
3035 | template-argument, which must be an lvalue. */ | |
0dc09a61 MM |
3036 | if (!same_type_p (TYPE_MAIN_VARIANT (expr_type), |
3037 | TYPE_MAIN_VARIANT (type_referred_to)) | |
91063b51 MM |
3038 | || !at_least_as_qualified_p (type_referred_to, |
3039 | expr_type) | |
75650646 | 3040 | || !real_lvalue_p (expr)) |
fd74ca0b | 3041 | return error_mark_node; |
75650646 | 3042 | } |
0dc09a61 MM |
3043 | |
3044 | mark_addressable (expr); | |
3045 | return build1 (ADDR_EXPR, type, expr); | |
75650646 MM |
3046 | } |
3047 | break; | |
3048 | ||
3049 | case RECORD_TYPE: | |
3050 | { | |
410c2fba KL |
3051 | if (!TYPE_PTRMEMFUNC_P (type)) |
3052 | /* This handles templates like | |
3053 | template<class T, T t> void f(); | |
3054 | when T is substituted with any class. The second template | |
3055 | parameter becomes invalid and the template candidate is | |
3056 | rejected. */ | |
3057 | return error_mark_node; | |
75650646 MM |
3058 | |
3059 | /* For a non-type template-parameter of type pointer to member | |
3060 | function, no conversions apply. If the template-argument | |
3061 | represents a set of overloaded member functions, the | |
3062 | matching member function is selected from the set | |
3063 | (_over.over_). */ | |
3064 | ||
3065 | if (!TYPE_PTRMEMFUNC_P (expr_type) && | |
3066 | expr_type != unknown_type_node) | |
3067 | return error_mark_node; | |
3068 | ||
e08a8f45 | 3069 | if (TREE_CODE (expr) == PTRMEM_CST) |
75650646 MM |
3070 | { |
3071 | /* A ptr-to-member constant. */ | |
3bfdc719 | 3072 | if (!same_type_p (type, expr_type)) |
75650646 MM |
3073 | return error_mark_node; |
3074 | else | |
3075 | return expr; | |
3076 | } | |
3077 | ||
3078 | if (TREE_CODE (expr) != ADDR_EXPR) | |
3079 | return error_mark_node; | |
3080 | ||
5e76004e | 3081 | expr = instantiate_type (type, expr, itf_none); |
75650646 | 3082 | |
d8f8dca1 | 3083 | if (expr == error_mark_node) |
75650646 MM |
3084 | return error_mark_node; |
3085 | ||
3bfdc719 | 3086 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
3087 | 0); |
3088 | return expr; | |
3089 | } | |
3090 | break; | |
3091 | ||
3092 | default: | |
3093 | /* All non-type parameters must have one of these types. */ | |
3094 | my_friendly_abort (0); | |
3095 | break; | |
3096 | } | |
3097 | ||
3098 | return error_mark_node; | |
3099 | } | |
3100 | ||
744fac59 KL |
3101 | /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for |
3102 | template template parameters. Both PARM_PARMS and ARG_PARMS are | |
3103 | vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL | |
3104 | or PARM_DECL. | |
3105 | ||
3106 | ARG_PARMS may contain more parameters than PARM_PARMS. If this is | |
3107 | the case, then extra parameters must have default arguments. | |
3108 | ||
3109 | Consider the example: | |
3110 | template <class T, class Allocator = allocator> class vector; | |
3111 | template<template <class U> class TT> class C; | |
3112 | ||
3113 | C<vector> is a valid instantiation. PARM_PARMS for the above code | |
3114 | contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for | |
3115 | T and Allocator) and OUTER_ARGS contains the argument that is used to | |
3116 | substitute the TT parameter. */ | |
3117 | ||
3118 | static int | |
4393e105 MM |
3119 | coerce_template_template_parms (parm_parms, arg_parms, complain, |
3120 | in_decl, outer_args) | |
3121 | tree parm_parms, arg_parms; | |
3122 | int complain; | |
3123 | tree in_decl, outer_args; | |
744fac59 KL |
3124 | { |
3125 | int nparms, nargs, i; | |
3126 | tree parm, arg; | |
3127 | ||
3128 | my_friendly_assert (TREE_CODE (parm_parms) == TREE_VEC, 0); | |
3129 | my_friendly_assert (TREE_CODE (arg_parms) == TREE_VEC, 0); | |
3130 | ||
3131 | nparms = TREE_VEC_LENGTH (parm_parms); | |
3132 | nargs = TREE_VEC_LENGTH (arg_parms); | |
3133 | ||
3134 | /* The rule here is opposite of coerce_template_parms. */ | |
3135 | if (nargs < nparms | |
3136 | || (nargs > nparms | |
3137 | && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE)) | |
3138 | return 0; | |
3139 | ||
3140 | for (i = 0; i < nparms; ++i) | |
3141 | { | |
3142 | parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i)); | |
3143 | arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i)); | |
3144 | ||
3145 | if (arg == NULL_TREE || arg == error_mark_node | |
3146 | || parm == NULL_TREE || parm == error_mark_node) | |
3147 | return 0; | |
3148 | ||
3149 | if (TREE_CODE (arg) != TREE_CODE (parm)) | |
3150 | return 0; | |
3151 | ||
3152 | switch (TREE_CODE (parm)) | |
3153 | { | |
3154 | case TYPE_DECL: | |
3155 | break; | |
3156 | ||
3157 | case TEMPLATE_DECL: | |
3158 | /* We encounter instantiations of templates like | |
3159 | template <template <template <class> class> class TT> | |
3160 | class C; */ | |
700466c2 JM |
3161 | { |
3162 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
3163 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3164 | ||
3165 | if (!coerce_template_template_parms (parmparm, argparm, | |
4393e105 MM |
3166 | complain, in_decl, |
3167 | outer_args)) | |
700466c2 JM |
3168 | return 0; |
3169 | } | |
3170 | break; | |
744fac59 KL |
3171 | |
3172 | case PARM_DECL: | |
3173 | /* The tsubst call is used to handle cases such as | |
3174 | template <class T, template <T> class TT> class D; | |
3175 | i.e. the parameter list of TT depends on earlier parameters. */ | |
4393e105 MM |
3176 | if (!same_type_p (tsubst (TREE_TYPE (parm), outer_args, |
3177 | complain, in_decl), | |
3bfdc719 | 3178 | TREE_TYPE (arg))) |
744fac59 KL |
3179 | return 0; |
3180 | break; | |
3181 | ||
3182 | default: | |
3183 | my_friendly_abort (0); | |
3184 | } | |
3185 | } | |
3186 | return 1; | |
3187 | } | |
3188 | ||
8b5b8b7c MM |
3189 | /* Convert the indicated template ARG as necessary to match the |
3190 | indicated template PARM. Returns the converted ARG, or | |
3191 | error_mark_node if the conversion was unsuccessful. Error messages | |
3192 | are issued if COMPLAIN is non-zero. This conversion is for the Ith | |
3193 | parameter in the parameter list. ARGS is the full set of template | |
3194 | arguments deduced so far. */ | |
3195 | ||
3196 | static tree | |
3197 | convert_template_argument (parm, arg, args, complain, i, in_decl) | |
3198 | tree parm; | |
3199 | tree arg; | |
3200 | tree args; | |
3201 | int complain; | |
3202 | int i; | |
3203 | tree in_decl; | |
3204 | { | |
3205 | tree val; | |
3206 | tree inner_args; | |
3207 | int is_type, requires_type, is_tmpl_type, requires_tmpl_type; | |
3208 | ||
f9a7ae04 | 3209 | inner_args = INNERMOST_TEMPLATE_ARGS (args); |
8b5b8b7c MM |
3210 | |
3211 | if (TREE_CODE (arg) == TREE_LIST | |
3212 | && TREE_TYPE (arg) != NULL_TREE | |
3213 | && TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
3214 | { | |
3215 | /* The template argument was the name of some | |
3216 | member function. That's usually | |
3217 | illegal, but static members are OK. In any | |
3218 | case, grab the underlying fields/functions | |
3219 | and issue an error later if required. */ | |
3220 | arg = TREE_VALUE (arg); | |
3221 | TREE_TYPE (arg) = unknown_type_node; | |
3222 | } | |
3223 | ||
3224 | requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL; | |
3225 | requires_type = (TREE_CODE (parm) == TYPE_DECL | |
3226 | || requires_tmpl_type); | |
3227 | ||
3228 | /* Check if it is a class template. If REQUIRES_TMPL_TYPE is true, | |
3229 | we also accept implicitly created TYPE_DECL as a valid argument. | |
3230 | This is necessary to handle the case where we pass a template name | |
3231 | to a template template parameter in a scope where we've derived from | |
3232 | in instantiation of that template, so the template name refers to that | |
3233 | instantiation. We really ought to handle this better. */ | |
3234 | is_tmpl_type | |
3235 | = ((TREE_CODE (arg) == TEMPLATE_DECL | |
3236 | && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL) | |
a1281f45 | 3237 | || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM |
8b5b8b7c MM |
3238 | || (TREE_CODE (arg) == RECORD_TYPE |
3239 | && CLASSTYPE_TEMPLATE_INFO (arg) | |
3240 | && TREE_CODE (TYPE_NAME (arg)) == TYPE_DECL | |
3241 | && DECL_ARTIFICIAL (TYPE_NAME (arg)) | |
3242 | && requires_tmpl_type | |
b54ccf71 | 3243 | && is_base_of_enclosing_class (arg, current_class_type))); |
8b5b8b7c MM |
3244 | if (is_tmpl_type && TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) |
3245 | arg = TYPE_STUB_DECL (arg); | |
3246 | else if (is_tmpl_type && TREE_CODE (arg) == RECORD_TYPE) | |
3247 | arg = CLASSTYPE_TI_TEMPLATE (arg); | |
3248 | ||
2f939d94 | 3249 | is_type = TYPE_P (arg) || is_tmpl_type; |
8b5b8b7c MM |
3250 | |
3251 | if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF | |
3252 | && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM) | |
3253 | { | |
b4f4233d | 3254 | cp_pedwarn ("to refer to a type member of a template parameter, use `typename %E'", arg); |
8b5b8b7c MM |
3255 | |
3256 | arg = make_typename_type (TREE_OPERAND (arg, 0), | |
3baa501d MM |
3257 | TREE_OPERAND (arg, 1), |
3258 | complain); | |
8b5b8b7c MM |
3259 | is_type = 1; |
3260 | } | |
3261 | if (is_type != requires_type) | |
3262 | { | |
3263 | if (in_decl) | |
3264 | { | |
3265 | if (complain) | |
3266 | { | |
8251199e | 3267 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
3268 | i + 1, in_decl); |
3269 | if (is_type) | |
8251199e | 3270 | cp_error (" expected a constant of type `%T', got `%T'", |
8b5b8b7c MM |
3271 | TREE_TYPE (parm), |
3272 | (is_tmpl_type ? DECL_NAME (arg) : arg)); | |
3273 | else | |
8251199e | 3274 | cp_error (" expected a type, got `%E'", arg); |
8b5b8b7c MM |
3275 | } |
3276 | } | |
3277 | return error_mark_node; | |
3278 | } | |
3279 | if (is_tmpl_type ^ requires_tmpl_type) | |
3280 | { | |
3281 | if (in_decl && complain) | |
3282 | { | |
8251199e | 3283 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
3284 | i + 1, in_decl); |
3285 | if (is_tmpl_type) | |
8251199e | 3286 | cp_error (" expected a type, got `%T'", DECL_NAME (arg)); |
8b5b8b7c | 3287 | else |
8251199e | 3288 | cp_error (" expected a class template, got `%T'", arg); |
8b5b8b7c MM |
3289 | } |
3290 | return error_mark_node; | |
3291 | } | |
3292 | ||
3293 | if (is_type) | |
3294 | { | |
3295 | if (requires_tmpl_type) | |
3296 | { | |
3297 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
3298 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3299 | ||
4393e105 | 3300 | if (coerce_template_template_parms (parmparm, argparm, complain, |
8b5b8b7c MM |
3301 | in_decl, inner_args)) |
3302 | { | |
3303 | val = arg; | |
3304 | ||
3305 | /* TEMPLATE_TEMPLATE_PARM node is preferred over | |
3306 | TEMPLATE_DECL. */ | |
3307 | if (val != error_mark_node | |
3308 | && DECL_TEMPLATE_TEMPLATE_PARM_P (val)) | |
3309 | val = TREE_TYPE (val); | |
3310 | } | |
3311 | else | |
3312 | { | |
3313 | if (in_decl && complain) | |
3314 | { | |
8251199e | 3315 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c | 3316 | i + 1, in_decl); |
8251199e | 3317 | cp_error (" expected a template of type `%D', got `%D'", parm, arg); |
8b5b8b7c MM |
3318 | } |
3319 | ||
3320 | val = error_mark_node; | |
3321 | } | |
3322 | } | |
3323 | else | |
3324 | { | |
3325 | val = groktypename (arg); | |
3326 | if (! processing_template_decl) | |
3327 | { | |
3328 | /* [basic.link]: A name with no linkage (notably, the | |
3329 | name of a class or enumeration declared in a local | |
3330 | scope) shall not be used to declare an entity with | |
3331 | linkage. This implies that names with no linkage | |
3332 | cannot be used as template arguments. */ | |
3333 | tree t = no_linkage_check (val); | |
3334 | if (t) | |
3335 | { | |
3336 | if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t))) | |
8251199e JM |
3337 | cp_pedwarn |
3338 | ("template-argument `%T' uses anonymous type", val); | |
8b5b8b7c | 3339 | else |
8251199e JM |
3340 | cp_error |
3341 | ("template-argument `%T' uses local type `%T'", | |
8b5b8b7c MM |
3342 | val, t); |
3343 | return error_mark_node; | |
3344 | } | |
3345 | } | |
3346 | } | |
3347 | } | |
3348 | else | |
3349 | { | |
4393e105 | 3350 | tree t = tsubst (TREE_TYPE (parm), args, complain, in_decl); |
8b5b8b7c MM |
3351 | |
3352 | if (processing_template_decl) | |
3353 | arg = maybe_fold_nontype_arg (arg); | |
3354 | ||
3355 | if (!uses_template_parms (arg) && !uses_template_parms (t)) | |
3356 | /* We used to call digest_init here. However, digest_init | |
3357 | will report errors, which we don't want when complain | |
3358 | is zero. More importantly, digest_init will try too | |
3359 | hard to convert things: for example, `0' should not be | |
3360 | converted to pointer type at this point according to | |
3361 | the standard. Accepting this is not merely an | |
3362 | extension, since deciding whether or not these | |
3363 | conversions can occur is part of determining which | |
dc957d14 | 3364 | function template to call, or whether a given explicit |
8b5b8b7c MM |
3365 | argument specification is legal. */ |
3366 | val = convert_nontype_argument (t, arg); | |
3367 | else | |
3368 | val = arg; | |
3369 | ||
3370 | if (val == NULL_TREE) | |
3371 | val = error_mark_node; | |
3372 | else if (val == error_mark_node && complain) | |
8251199e | 3373 | cp_error ("could not convert template argument `%E' to `%T'", |
8b5b8b7c MM |
3374 | arg, t); |
3375 | } | |
3376 | ||
3377 | return val; | |
3378 | } | |
3379 | ||
3380 | /* Convert all template arguments to their appropriate types, and | |
3381 | return a vector containing the innermost resulting template | |
3382 | arguments. If any error occurs, return error_mark_node, and, if | |
3383 | COMPLAIN is non-zero, issue an error message. Some error messages | |
3384 | are issued even if COMPLAIN is zero; for instance, if a template | |
3385 | argument is composed from a local class. | |
75650646 MM |
3386 | |
3387 | If REQUIRE_ALL_ARGUMENTS is non-zero, all arguments must be | |
3388 | provided in ARGLIST, or else trailing parameters must have default | |
3389 | values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument | |
6dfbb909 | 3390 | deduction for any unspecified trailing arguments. */ |
de575009 | 3391 | |
8d08fdba | 3392 | static tree |
8b5b8b7c | 3393 | coerce_template_parms (parms, args, in_decl, |
75650646 | 3394 | complain, |
744fac59 | 3395 | require_all_arguments) |
8b5b8b7c | 3396 | tree parms, args; |
8d08fdba | 3397 | tree in_decl; |
75650646 MM |
3398 | int complain; |
3399 | int require_all_arguments; | |
8d08fdba | 3400 | { |
a292b002 | 3401 | int nparms, nargs, i, lost = 0; |
e4a84209 | 3402 | tree inner_args; |
8b5b8b7c MM |
3403 | tree new_args; |
3404 | tree new_inner_args; | |
a292b002 | 3405 | |
f9a7ae04 | 3406 | inner_args = INNERMOST_TEMPLATE_ARGS (args); |
e4a84209 | 3407 | nargs = NUM_TMPL_ARGS (inner_args); |
a292b002 MS |
3408 | nparms = TREE_VEC_LENGTH (parms); |
3409 | ||
3410 | if (nargs > nparms | |
3411 | || (nargs < nparms | |
75650646 | 3412 | && require_all_arguments |
a292b002 | 3413 | && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE)) |
8d08fdba | 3414 | { |
75650646 MM |
3415 | if (complain) |
3416 | { | |
8251199e | 3417 | cp_error ("wrong number of template arguments (%d, should be %d)", |
e4a84209 | 3418 | nargs, nparms); |
75650646 MM |
3419 | |
3420 | if (in_decl) | |
8251199e | 3421 | cp_error_at ("provided for `%D'", in_decl); |
75650646 MM |
3422 | } |
3423 | ||
8d08fdba MS |
3424 | return error_mark_node; |
3425 | } | |
3426 | ||
f31c0a32 | 3427 | new_inner_args = make_tree_vec (nparms); |
8b5b8b7c MM |
3428 | new_args = add_outermost_template_args (args, new_inner_args); |
3429 | for (i = 0; i < nparms; i++) | |
8d08fdba | 3430 | { |
8b5b8b7c MM |
3431 | tree arg; |
3432 | tree parm; | |
e4a84209 | 3433 | |
8b5b8b7c MM |
3434 | /* Get the Ith template parameter. */ |
3435 | parm = TREE_VEC_ELT (parms, i); | |
75650646 | 3436 | |
8b5b8b7c MM |
3437 | /* Calculate the Ith argument. */ |
3438 | if (inner_args && TREE_CODE (inner_args) == TREE_LIST) | |
8d08fdba | 3439 | { |
8b5b8b7c MM |
3440 | arg = TREE_VALUE (inner_args); |
3441 | inner_args = TREE_CHAIN (inner_args); | |
8d08fdba | 3442 | } |
8b5b8b7c MM |
3443 | else if (i < nargs) |
3444 | arg = TREE_VEC_ELT (inner_args, i); | |
3445 | /* If no template argument was supplied, look for a default | |
3446 | value. */ | |
3447 | else if (TREE_PURPOSE (parm) == NULL_TREE) | |
3448 | { | |
3449 | /* There was no default value. */ | |
3450 | my_friendly_assert (!require_all_arguments, 0); | |
3451 | break; | |
3452 | } | |
3453 | else if (TREE_CODE (TREE_VALUE (parm)) == TYPE_DECL) | |
4393e105 | 3454 | arg = tsubst (TREE_PURPOSE (parm), new_args, complain, in_decl); |
8b5b8b7c | 3455 | else |
4393e105 MM |
3456 | arg = tsubst_expr (TREE_PURPOSE (parm), new_args, complain, |
3457 | in_decl); | |
e4a84209 | 3458 | |
8b5b8b7c | 3459 | /* Now, convert the Ith argument, as necessary. */ |
75650646 MM |
3460 | if (arg == NULL_TREE) |
3461 | /* We're out of arguments. */ | |
3462 | { | |
3463 | my_friendly_assert (!require_all_arguments, 0); | |
3464 | break; | |
3465 | } | |
8b5b8b7c | 3466 | else if (arg == error_mark_node) |
75650646 | 3467 | { |
8251199e | 3468 | cp_error ("template argument %d is invalid", i + 1); |
8b5b8b7c | 3469 | arg = error_mark_node; |
8d08fdba | 3470 | } |
8b5b8b7c MM |
3471 | else |
3472 | arg = convert_template_argument (TREE_VALUE (parm), | |
3473 | arg, new_args, complain, i, | |
3474 | in_decl); | |
3475 | ||
3476 | if (arg == error_mark_node) | |
8d08fdba | 3477 | lost++; |
8b5b8b7c | 3478 | TREE_VEC_ELT (new_inner_args, i) = arg; |
8d08fdba | 3479 | } |
8b5b8b7c | 3480 | |
8d08fdba MS |
3481 | if (lost) |
3482 | return error_mark_node; | |
8b5b8b7c MM |
3483 | |
3484 | return new_inner_args; | |
8d08fdba MS |
3485 | } |
3486 | ||
34016c81 JM |
3487 | /* Returns 1 if template args OT and NT are equivalent. */ |
3488 | ||
d8e178a0 | 3489 | static int |
34016c81 JM |
3490 | template_args_equal (ot, nt) |
3491 | tree ot, nt; | |
3492 | { | |
3493 | if (nt == ot) | |
3494 | return 1; | |
74601d7c | 3495 | |
34016c81 JM |
3496 | if (TREE_CODE (nt) == TREE_VEC) |
3497 | /* For member templates */ | |
74601d7c KL |
3498 | return TREE_CODE (ot) == TREE_VEC && comp_template_args (ot, nt); |
3499 | else if (TYPE_P (nt)) | |
3500 | return TYPE_P (ot) && same_type_p (ot, nt); | |
3501 | else if (TREE_CODE (ot) == TREE_VEC || TYPE_P (ot)) | |
3502 | return 0; | |
34016c81 JM |
3503 | else |
3504 | return (cp_tree_equal (ot, nt) > 0); | |
3505 | } | |
3506 | ||
3507 | /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets | |
f84b4be9 JM |
3508 | of template arguments. Returns 0 otherwise. */ |
3509 | ||
6757edfe | 3510 | int |
5566b478 MS |
3511 | comp_template_args (oldargs, newargs) |
3512 | tree oldargs, newargs; | |
3513 | { | |
3514 | int i; | |
3515 | ||
386b8a85 JM |
3516 | if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs)) |
3517 | return 0; | |
3518 | ||
5566b478 MS |
3519 | for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i) |
3520 | { | |
3521 | tree nt = TREE_VEC_ELT (newargs, i); | |
3522 | tree ot = TREE_VEC_ELT (oldargs, i); | |
3523 | ||
34016c81 | 3524 | if (! template_args_equal (ot, nt)) |
61a127b3 | 3525 | return 0; |
5566b478 MS |
3526 | } |
3527 | return 1; | |
3528 | } | |
3529 | ||
8d08fdba MS |
3530 | /* Given class template name and parameter list, produce a user-friendly name |
3531 | for the instantiation. */ | |
e92cc029 | 3532 | |
8d08fdba | 3533 | static char * |
36a117a5 | 3534 | mangle_class_name_for_template (name, parms, arglist) |
63ad61ed | 3535 | const char *name; |
8d08fdba MS |
3536 | tree parms, arglist; |
3537 | { | |
3538 | static struct obstack scratch_obstack; | |
3539 | static char *scratch_firstobj; | |
3540 | int i, nparms; | |
8d08fdba MS |
3541 | |
3542 | if (!scratch_firstobj) | |
fc378698 | 3543 | gcc_obstack_init (&scratch_obstack); |
8d08fdba MS |
3544 | else |
3545 | obstack_free (&scratch_obstack, scratch_firstobj); | |
fc378698 | 3546 | scratch_firstobj = obstack_alloc (&scratch_obstack, 1); |
8d08fdba | 3547 | |
8d08fdba | 3548 | #define ccat(c) obstack_1grow (&scratch_obstack, (c)); |
8d08fdba | 3549 | #define cat(s) obstack_grow (&scratch_obstack, (s), strlen (s)) |
8d08fdba MS |
3550 | |
3551 | cat (name); | |
3552 | ccat ('<'); | |
3553 | nparms = TREE_VEC_LENGTH (parms); | |
f9a7ae04 | 3554 | arglist = INNERMOST_TEMPLATE_ARGS (arglist); |
8d08fdba MS |
3555 | my_friendly_assert (nparms == TREE_VEC_LENGTH (arglist), 268); |
3556 | for (i = 0; i < nparms; i++) | |
3557 | { | |
a292b002 MS |
3558 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
3559 | tree arg = TREE_VEC_ELT (arglist, i); | |
8d08fdba MS |
3560 | |
3561 | if (i) | |
3562 | ccat (','); | |
3563 | ||
a292b002 | 3564 | if (TREE_CODE (parm) == TYPE_DECL) |
8d08fdba | 3565 | { |
761f0855 | 3566 | cat (type_as_string (arg, TFF_CHASE_TYPEDEF)); |
8d08fdba MS |
3567 | continue; |
3568 | } | |
73b0fce8 KL |
3569 | else if (TREE_CODE (parm) == TEMPLATE_DECL) |
3570 | { | |
3571 | if (TREE_CODE (arg) == TEMPLATE_DECL) | |
2c73f9f5 ML |
3572 | { |
3573 | /* Already substituted with real template. Just output | |
3574 | the template name here */ | |
cb0dbb9a | 3575 | tree context = DECL_CONTEXT (arg); |
ec4f972f AS |
3576 | if (context) |
3577 | { | |
3578 | /* The template may be defined in a namespace, or | |
3579 | may be a member template. */ | |
3580 | my_friendly_assert (TREE_CODE (context) == NAMESPACE_DECL | |
3581 | || CLASS_TYPE_P (context), | |
3582 | 980422); | |
761f0855 | 3583 | cat(decl_as_string (DECL_CONTEXT (arg), TFF_PLAIN_IDENTIFIER)); |
2c73f9f5 ML |
3584 | cat("::"); |
3585 | } | |
3586 | cat (IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3587 | } | |
73b0fce8 KL |
3588 | else |
3589 | /* Output the parameter declaration */ | |
761f0855 | 3590 | cat (type_as_string (arg, TFF_CHASE_TYPEDEF)); |
73b0fce8 KL |
3591 | continue; |
3592 | } | |
8d08fdba MS |
3593 | else |
3594 | my_friendly_assert (TREE_CODE (parm) == PARM_DECL, 269); | |
3595 | ||
3596 | if (TREE_CODE (arg) == TREE_LIST) | |
3597 | { | |
3598 | /* New list cell was built because old chain link was in | |
3599 | use. */ | |
3600 | my_friendly_assert (TREE_PURPOSE (arg) == NULL_TREE, 270); | |
3601 | arg = TREE_VALUE (arg); | |
3602 | } | |
3603 | /* No need to check arglist against parmlist here; we did that | |
3604 | in coerce_template_parms, called from lookup_template_class. */ | |
761f0855 | 3605 | cat (expr_as_string (arg, TFF_PLAIN_IDENTIFIER)); |
8d08fdba MS |
3606 | } |
3607 | { | |
3608 | char *bufp = obstack_next_free (&scratch_obstack); | |
3609 | int offset = 0; | |
3610 | while (bufp[offset - 1] == ' ') | |
3611 | offset--; | |
3612 | obstack_blank_fast (&scratch_obstack, offset); | |
3613 | ||
3614 | /* B<C<char> >, not B<C<char>> */ | |
3615 | if (bufp[offset - 1] == '>') | |
3616 | ccat (' '); | |
3617 | } | |
3618 | ccat ('>'); | |
3619 | ccat ('\0'); | |
3620 | return (char *) obstack_base (&scratch_obstack); | |
8d08fdba MS |
3621 | } |
3622 | ||
bd6dd845 | 3623 | static tree |
5566b478 MS |
3624 | classtype_mangled_name (t) |
3625 | tree t; | |
3626 | { | |
3627 | if (CLASSTYPE_TEMPLATE_INFO (t) | |
36a117a5 MM |
3628 | /* Specializations have already had their names set up in |
3629 | lookup_template_class. */ | |
370af2d5 | 3630 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
9fbf56f7 MM |
3631 | { |
3632 | tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t)); | |
3633 | ||
36a117a5 MM |
3634 | /* For non-primary templates, the template parameters are |
3635 | implicit from their surrounding context. */ | |
9fbf56f7 MM |
3636 | if (PRIMARY_TEMPLATE_P (tmpl)) |
3637 | { | |
3638 | tree name = DECL_NAME (tmpl); | |
3639 | char *mangled_name = mangle_class_name_for_template | |
3640 | (IDENTIFIER_POINTER (name), | |
3641 | DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
3642 | CLASSTYPE_TI_ARGS (t)); | |
3643 | tree id = get_identifier (mangled_name); | |
3644 | IDENTIFIER_TEMPLATE (id) = name; | |
3645 | return id; | |
3646 | } | |
5566b478 | 3647 | } |
9fbf56f7 MM |
3648 | |
3649 | return TYPE_IDENTIFIER (t); | |
5566b478 MS |
3650 | } |
3651 | ||
3652 | static void | |
3653 | add_pending_template (d) | |
3654 | tree d; | |
3655 | { | |
3ae18eaf JM |
3656 | tree ti = (TYPE_P (d) |
3657 | ? CLASSTYPE_TEMPLATE_INFO (d) | |
3658 | : DECL_TEMPLATE_INFO (d)); | |
3659 | int level; | |
e92cc029 | 3660 | |
824b9a4c | 3661 | if (TI_PENDING_TEMPLATE_FLAG (ti)) |
5566b478 MS |
3662 | return; |
3663 | ||
3ae18eaf JM |
3664 | /* We are called both from instantiate_decl, where we've already had a |
3665 | tinst_level pushed, and instantiate_template, where we haven't. | |
3666 | Compensate. */ | |
3667 | level = !(current_tinst_level && TINST_DECL (current_tinst_level) == d); | |
3668 | ||
3669 | if (level) | |
3670 | push_tinst_level (d); | |
3671 | ||
3672 | *template_tail = tree_cons (current_tinst_level, d, NULL_TREE); | |
5566b478 | 3673 | template_tail = &TREE_CHAIN (*template_tail); |
824b9a4c | 3674 | TI_PENDING_TEMPLATE_FLAG (ti) = 1; |
3ae18eaf JM |
3675 | |
3676 | if (level) | |
3677 | pop_tinst_level (); | |
5566b478 MS |
3678 | } |
3679 | ||
386b8a85 JM |
3680 | |
3681 | /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS (which | |
3682 | may be either a _DECL or an overloaded function or an | |
3683 | IDENTIFIER_NODE), and ARGLIST. */ | |
3684 | ||
3685 | tree | |
3686 | lookup_template_function (fns, arglist) | |
3687 | tree fns, arglist; | |
3688 | { | |
2c73f9f5 | 3689 | tree type; |
050367a3 | 3690 | |
386b8a85 JM |
3691 | if (fns == NULL_TREE) |
3692 | { | |
8251199e | 3693 | cp_error ("non-template used as template"); |
386b8a85 JM |
3694 | return error_mark_node; |
3695 | } | |
3696 | ||
2c73f9f5 ML |
3697 | type = TREE_TYPE (fns); |
3698 | if (TREE_CODE (fns) == OVERLOAD || !type) | |
3699 | type = unknown_type_node; | |
3700 | ||
672476cb MM |
3701 | if (processing_template_decl) |
3702 | return build_min (TEMPLATE_ID_EXPR, type, fns, arglist); | |
3703 | else | |
3704 | return build (TEMPLATE_ID_EXPR, type, fns, arglist); | |
386b8a85 JM |
3705 | } |
3706 | ||
a2b60a0e MM |
3707 | /* Within the scope of a template class S<T>, the name S gets bound |
3708 | (in build_self_reference) to a TYPE_DECL for the class, not a | |
3709 | TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type, | |
3710 | or one of its enclosing classes, and that type is a template, | |
3711 | return the associated TEMPLATE_DECL. Otherwise, the original | |
3712 | DECL is returned. */ | |
3713 | ||
e9659ab0 | 3714 | static tree |
a2b60a0e MM |
3715 | maybe_get_template_decl_from_type_decl (decl) |
3716 | tree decl; | |
3717 | { | |
3718 | return (decl != NULL_TREE | |
3719 | && TREE_CODE (decl) == TYPE_DECL | |
3720 | && DECL_ARTIFICIAL (decl) | |
511b60ff | 3721 | && CLASS_TYPE_P (TREE_TYPE (decl)) |
a2b60a0e MM |
3722 | && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl))) |
3723 | ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl; | |
3724 | } | |
386b8a85 | 3725 | |
8d08fdba MS |
3726 | /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of |
3727 | parameters, find the desired type. | |
3728 | ||
3729 | D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments. | |
36a117a5 MM |
3730 | (Actually ARGLIST may be either a TREE_LIST or a TREE_VEC. It will |
3731 | be a TREE_LIST if called directly from the parser, and a TREE_VEC | |
ab097535 | 3732 | otherwise.) |
8d08fdba MS |
3733 | |
3734 | IN_DECL, if non-NULL, is the template declaration we are trying to | |
75650646 MM |
3735 | instantiate. |
3736 | ||
36a117a5 MM |
3737 | If ENTERING_SCOPE is non-zero, we are about to enter the scope of |
3738 | the class we are looking up. | |
3739 | ||
75650646 MM |
3740 | If the template class is really a local class in a template |
3741 | function, then the FUNCTION_CONTEXT is the function in which it is | |
3742 | being instantiated. */ | |
e92cc029 | 3743 | |
8d08fdba | 3744 | tree |
36a117a5 | 3745 | lookup_template_class (d1, arglist, in_decl, context, entering_scope) |
8d08fdba MS |
3746 | tree d1, arglist; |
3747 | tree in_decl; | |
e1467ff2 | 3748 | tree context; |
36a117a5 | 3749 | int entering_scope; |
8d08fdba | 3750 | { |
a703fb38 | 3751 | tree template = NULL_TREE, parmlist; |
dbfe2124 | 3752 | tree t; |
5566b478 MS |
3753 | |
3754 | if (TREE_CODE (d1) == IDENTIFIER_NODE) | |
3755 | { | |
f181d4ae MM |
3756 | if (IDENTIFIER_VALUE (d1) |
3757 | && DECL_TEMPLATE_TEMPLATE_PARM_P (IDENTIFIER_VALUE (d1))) | |
3758 | template = IDENTIFIER_VALUE (d1); | |
73b0fce8 KL |
3759 | else |
3760 | { | |
2c73f9f5 ML |
3761 | if (context) |
3762 | push_decl_namespace (context); | |
3ebc5c52 MM |
3763 | template = lookup_name (d1, /*prefer_type=*/0); |
3764 | template = maybe_get_template_decl_from_type_decl (template); | |
2c73f9f5 ML |
3765 | if (context) |
3766 | pop_decl_namespace (); | |
73b0fce8 | 3767 | } |
8d019cef JM |
3768 | if (template) |
3769 | context = DECL_CONTEXT (template); | |
5566b478 | 3770 | } |
c91a56d2 MS |
3771 | else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1))) |
3772 | { | |
802dbc34 JM |
3773 | tree type = TREE_TYPE (d1); |
3774 | ||
3775 | /* If we are declaring a constructor, say A<T>::A<T>, we will get | |
3776 | an implicit typename for the second A. Deal with it. */ | |
3777 | if (TREE_CODE (type) == TYPENAME_TYPE && TREE_TYPE (type)) | |
3778 | type = TREE_TYPE (type); | |
3779 | ||
3780 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
f3400fe2 | 3781 | { |
802dbc34 | 3782 | template = CLASSTYPE_TI_TEMPLATE (type); |
f3400fe2 JM |
3783 | d1 = DECL_NAME (template); |
3784 | } | |
c91a56d2 | 3785 | } |
ed44da02 | 3786 | else if (TREE_CODE (d1) == ENUMERAL_TYPE |
2f939d94 | 3787 | || (TYPE_P (d1) && IS_AGGR_TYPE (d1))) |
5566b478 | 3788 | { |
ed44da02 | 3789 | template = TYPE_TI_TEMPLATE (d1); |
5566b478 MS |
3790 | d1 = DECL_NAME (template); |
3791 | } | |
93cdc044 | 3792 | else if (TREE_CODE (d1) == TEMPLATE_DECL |
17aec3eb | 3793 | && TREE_CODE (DECL_TEMPLATE_RESULT (d1)) == TYPE_DECL) |
93cdc044 JM |
3794 | { |
3795 | template = d1; | |
3796 | d1 = DECL_NAME (template); | |
3797 | context = DECL_CONTEXT (template); | |
3798 | } | |
8d08fdba | 3799 | |
8d08fdba | 3800 | /* With something like `template <class T> class X class X { ... };' |
f181d4ae MM |
3801 | we could end up with D1 having nothing but an IDENTIFIER_VALUE. |
3802 | We don't want to do that, but we have to deal with the situation, | |
3803 | so let's give them some syntax errors to chew on instead of a | |
1bc0793e | 3804 | crash. Alternatively D1 might not be a template type at all. */ |
8d08fdba | 3805 | if (! template) |
f3400fe2 JM |
3806 | { |
3807 | cp_error ("`%T' is not a template", d1); | |
3808 | return error_mark_node; | |
3809 | } | |
2c73f9f5 | 3810 | |
8d08fdba MS |
3811 | if (TREE_CODE (template) != TEMPLATE_DECL) |
3812 | { | |
8251199e | 3813 | cp_error ("non-template type `%T' used as a template", d1); |
8d08fdba | 3814 | if (in_decl) |
8251199e | 3815 | cp_error_at ("for template declaration `%D'", in_decl); |
8d08fdba MS |
3816 | return error_mark_node; |
3817 | } | |
8d08fdba | 3818 | |
73b0fce8 KL |
3819 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (template)) |
3820 | { | |
3821 | /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store | |
3822 | template arguments */ | |
3823 | ||
1899c3a4 | 3824 | tree parm; |
73b0fce8 KL |
3825 | tree arglist2; |
3826 | ||
73b0fce8 KL |
3827 | parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template); |
3828 | ||
744fac59 | 3829 | arglist2 = coerce_template_parms (parmlist, arglist, template, 1, 1); |
73b0fce8 KL |
3830 | if (arglist2 == error_mark_node) |
3831 | return error_mark_node; | |
3832 | ||
1899c3a4 | 3833 | parm = copy_template_template_parm (TREE_TYPE (template), arglist2); |
73b0fce8 KL |
3834 | TYPE_SIZE (parm) = 0; |
3835 | return parm; | |
3836 | } | |
36a117a5 | 3837 | else |
8d08fdba | 3838 | { |
36a117a5 | 3839 | tree template_type = TREE_TYPE (template); |
7ac7b28f | 3840 | tree gen_tmpl; |
36a117a5 MM |
3841 | tree type_decl; |
3842 | tree found = NULL_TREE; | |
414ea4aa | 3843 | tree *tp; |
36a117a5 MM |
3844 | int arg_depth; |
3845 | int parm_depth; | |
dbfe2124 | 3846 | int is_partial_instantiation; |
830bfa74 | 3847 | |
7ac7b28f MM |
3848 | gen_tmpl = most_general_template (template); |
3849 | parmlist = DECL_TEMPLATE_PARMS (gen_tmpl); | |
36a117a5 MM |
3850 | parm_depth = TMPL_PARMS_DEPTH (parmlist); |
3851 | arg_depth = TMPL_ARGS_DEPTH (arglist); | |
3852 | ||
3853 | if (arg_depth == 1 && parm_depth > 1) | |
3854 | { | |
39c01e4c | 3855 | /* We've been given an incomplete set of template arguments. |
36a117a5 MM |
3856 | For example, given: |
3857 | ||
3858 | template <class T> struct S1 { | |
3859 | template <class U> struct S2 {}; | |
3860 | template <class U> struct S2<U*> {}; | |
3861 | }; | |
3862 | ||
3863 | we will be called with an ARGLIST of `U*', but the | |
3864 | TEMPLATE will be `template <class T> template | |
3865 | <class U> struct S1<T>::S2'. We must fill in the missing | |
3866 | arguments. */ | |
7ac7b28f MM |
3867 | arglist |
3868 | = add_outermost_template_args (TYPE_TI_ARGS (TREE_TYPE (template)), | |
3869 | arglist); | |
36a117a5 MM |
3870 | arg_depth = TMPL_ARGS_DEPTH (arglist); |
3871 | } | |
5566b478 | 3872 | |
7ac7b28f | 3873 | /* Now we should enough arguments. */ |
36a117a5 MM |
3874 | my_friendly_assert (parm_depth == arg_depth, 0); |
3875 | ||
7ac7b28f MM |
3876 | /* From here on, we're only interested in the most general |
3877 | template. */ | |
3878 | template = gen_tmpl; | |
3879 | ||
36a117a5 MM |
3880 | /* Calculate the BOUND_ARGS. These will be the args that are |
3881 | actually tsubst'd into the definition to create the | |
3882 | instantiation. */ | |
3883 | if (parm_depth > 1) | |
830bfa74 MM |
3884 | { |
3885 | /* We have multiple levels of arguments to coerce, at once. */ | |
830bfa74 | 3886 | int i; |
e4a84209 | 3887 | int saved_depth = TMPL_ARGS_DEPTH (arglist); |
36a117a5 | 3888 | |
f31c0a32 | 3889 | tree bound_args = make_tree_vec (parm_depth); |
830bfa74 | 3890 | |
e4a84209 | 3891 | for (i = saved_depth, |
830bfa74 | 3892 | t = DECL_TEMPLATE_PARMS (template); |
e4a84209 | 3893 | i > 0 && t != NULL_TREE; |
830bfa74 | 3894 | --i, t = TREE_CHAIN (t)) |
e4a84209 MM |
3895 | { |
3896 | tree a = coerce_template_parms (TREE_VALUE (t), | |
3897 | arglist, template, 1, 1); | |
3898 | SET_TMPL_ARGS_LEVEL (bound_args, i, a); | |
3899 | ||
3900 | /* We temporarily reduce the length of the ARGLIST so | |
3901 | that coerce_template_parms will see only the arguments | |
3902 | corresponding to the template parameters it is | |
3903 | examining. */ | |
3904 | TREE_VEC_LENGTH (arglist)--; | |
3905 | } | |
3906 | ||
3907 | /* Restore the ARGLIST to its full size. */ | |
3908 | TREE_VEC_LENGTH (arglist) = saved_depth; | |
3909 | ||
36a117a5 | 3910 | arglist = bound_args; |
830bfa74 MM |
3911 | } |
3912 | else | |
36a117a5 MM |
3913 | arglist |
3914 | = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist), | |
f9a7ae04 | 3915 | INNERMOST_TEMPLATE_ARGS (arglist), |
36a117a5 MM |
3916 | template, 1, 1); |
3917 | ||
3918 | if (arglist == error_mark_node) | |
3919 | /* We were unable to bind the arguments. */ | |
5566b478 | 3920 | return error_mark_node; |
5566b478 | 3921 | |
36a117a5 MM |
3922 | /* In the scope of a template class, explicit references to the |
3923 | template class refer to the type of the template, not any | |
3924 | instantiation of it. For example, in: | |
3925 | ||
3926 | template <class T> class C { void f(C<T>); } | |
3927 | ||
3928 | the `C<T>' is just the same as `C'. Outside of the | |
3929 | class, however, such a reference is an instantiation. */ | |
ed44da02 | 3930 | if (comp_template_args (TYPE_TI_ARGS (template_type), |
36a117a5 MM |
3931 | arglist)) |
3932 | { | |
3933 | found = template_type; | |
3934 | ||
3935 | if (!entering_scope && PRIMARY_TEMPLATE_P (template)) | |
5566b478 | 3936 | { |
36a117a5 MM |
3937 | tree ctx; |
3938 | ||
3939 | /* Note that we use DECL_CONTEXT, rather than | |
3940 | CP_DECL_CONTEXT, so that the termination test is | |
dc957d14 | 3941 | always just `ctx'. We're not interested in namespace |
36a117a5 MM |
3942 | scopes. */ |
3943 | for (ctx = current_class_type; | |
3944 | ctx; | |
2f939d94 | 3945 | ctx = (TYPE_P (ctx)) ? TYPE_CONTEXT (ctx) : DECL_CONTEXT (ctx)) |
3bfdc719 | 3946 | if (same_type_p (ctx, template_type)) |
36a117a5 MM |
3947 | break; |
3948 | ||
3949 | if (!ctx) | |
3950 | /* We're not in the scope of the class, so the | |
3951 | TEMPLATE_TYPE is not the type we want after | |
3952 | all. */ | |
3953 | found = NULL_TREE; | |
5566b478 MS |
3954 | } |
3955 | } | |
36a117a5 | 3956 | if (found) |
ab097535 | 3957 | return found; |
414ea4aa MM |
3958 | |
3959 | for (tp = &DECL_TEMPLATE_INSTANTIATIONS (template); | |
3960 | *tp; | |
3961 | tp = &TREE_CHAIN (*tp)) | |
3962 | if (comp_template_args (TREE_PURPOSE (*tp), arglist)) | |
3963 | { | |
3964 | found = *tp; | |
7e7d9517 MM |
3965 | |
3966 | /* Use the move-to-front heuristic to speed up future | |
3967 | searches. */ | |
414ea4aa MM |
3968 | *tp = TREE_CHAIN (*tp); |
3969 | TREE_CHAIN (found) | |
3970 | = DECL_TEMPLATE_INSTANTIATIONS (template); | |
3971 | DECL_TEMPLATE_INSTANTIATIONS (template) = found; | |
7e7d9517 | 3972 | |
414ea4aa MM |
3973 | return TREE_VALUE (found); |
3974 | } | |
5566b478 | 3975 | |
dbfe2124 | 3976 | /* This type is a "partial instantiation" if any of the template |
ab097535 | 3977 | arguments still involve template parameters. Note that we set |
486e4077 MM |
3978 | IS_PARTIAL_INSTANTIATION for partial specializations as |
3979 | well. */ | |
dbfe2124 MM |
3980 | is_partial_instantiation = uses_template_parms (arglist); |
3981 | ||
3ebc5c52 MM |
3982 | if (!is_partial_instantiation |
3983 | && !PRIMARY_TEMPLATE_P (template) | |
3984 | && TREE_CODE (CP_DECL_CONTEXT (template)) == NAMESPACE_DECL) | |
3985 | { | |
3ebc5c52 MM |
3986 | found = xref_tag_from_type (TREE_TYPE (template), |
3987 | DECL_NAME (template), | |
3988 | /*globalize=*/1); | |
3989 | return found; | |
3990 | } | |
3ebc5c52 | 3991 | |
95ee998c MM |
3992 | context = tsubst (DECL_CONTEXT (template), arglist, |
3993 | /*complain=*/0, in_decl); | |
3994 | if (!context) | |
3995 | context = global_namespace; | |
3996 | ||
36a117a5 | 3997 | /* Create the type. */ |
ed44da02 MM |
3998 | if (TREE_CODE (template_type) == ENUMERAL_TYPE) |
3999 | { | |
dbfe2124 | 4000 | if (!is_partial_instantiation) |
92777ce4 NS |
4001 | { |
4002 | set_current_access_from_decl (TYPE_NAME (template_type)); | |
4003 | t = start_enum (TYPE_IDENTIFIER (template_type)); | |
4004 | } | |
ed44da02 | 4005 | else |
dbfe2124 | 4006 | /* We don't want to call start_enum for this type, since |
ed44da02 MM |
4007 | the values for the enumeration constants may involve |
4008 | template parameters. And, no one should be interested | |
4009 | in the enumeration constants for such a type. */ | |
4010 | t = make_node (ENUMERAL_TYPE); | |
4011 | } | |
4012 | else | |
4013 | { | |
33848bb0 | 4014 | t = make_aggr_type (TREE_CODE (template_type)); |
ed44da02 MM |
4015 | CLASSTYPE_DECLARED_CLASS (t) |
4016 | = CLASSTYPE_DECLARED_CLASS (template_type); | |
4017 | CLASSTYPE_GOT_SEMICOLON (t) = 1; | |
4018 | SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t); | |
f668f160 | 4019 | TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type); |
ae673f14 JM |
4020 | |
4021 | /* A local class. Make sure the decl gets registered properly. */ | |
4022 | if (context == current_function_decl) | |
4023 | pushtag (DECL_NAME (template), t, 0); | |
ed44da02 MM |
4024 | } |
4025 | ||
ae673f14 JM |
4026 | /* If we called start_enum or pushtag above, this information |
4027 | will already be set up. */ | |
ed44da02 MM |
4028 | if (!TYPE_NAME (t)) |
4029 | { | |
4030 | TYPE_CONTEXT (t) = FROB_CONTEXT (context); | |
36a117a5 | 4031 | |
9188c363 | 4032 | type_decl = create_implicit_typedef (DECL_NAME (template), t); |
ed44da02 | 4033 | DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t); |
9188c363 | 4034 | TYPE_STUB_DECL (t) = type_decl; |
ed44da02 MM |
4035 | DECL_SOURCE_FILE (type_decl) |
4036 | = DECL_SOURCE_FILE (TYPE_STUB_DECL (template_type)); | |
4037 | DECL_SOURCE_LINE (type_decl) | |
4038 | = DECL_SOURCE_LINE (TYPE_STUB_DECL (template_type)); | |
ed44da02 MM |
4039 | } |
4040 | else | |
4041 | type_decl = TYPE_NAME (t); | |
36a117a5 | 4042 | |
9fbf56f7 MM |
4043 | /* Set up the template information. We have to figure out which |
4044 | template is the immediate parent if this is a full | |
4045 | instantiation. */ | |
4046 | if (parm_depth == 1 || is_partial_instantiation | |
4047 | || !PRIMARY_TEMPLATE_P (template)) | |
4048 | /* This case is easy; there are no member templates involved. */ | |
4049 | found = template; | |
4050 | else | |
4051 | { | |
ab097535 NS |
4052 | /* This is a full instantiation of a member template. Look |
4053 | for a partial instantiation of which this is an instance. */ | |
9fbf56f7 MM |
4054 | |
4055 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); | |
4056 | found; found = TREE_CHAIN (found)) | |
4057 | { | |
4058 | int success; | |
4059 | tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found)); | |
4060 | ||
4061 | /* We only want partial instantiations, here, not | |
4062 | specializations or full instantiations. */ | |
370af2d5 | 4063 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found)) |
9fbf56f7 MM |
4064 | || !uses_template_parms (TREE_VALUE (found))) |
4065 | continue; | |
4066 | ||
4067 | /* Temporarily reduce by one the number of levels in the | |
4068 | ARGLIST and in FOUND so as to avoid comparing the | |
4069 | last set of arguments. */ | |
4070 | TREE_VEC_LENGTH (arglist)--; | |
4071 | TREE_VEC_LENGTH (TREE_PURPOSE (found)) --; | |
4072 | ||
4073 | /* See if the arguments match. If they do, then TMPL is | |
4074 | the partial instantiation we want. */ | |
4075 | success = comp_template_args (TREE_PURPOSE (found), arglist); | |
4076 | ||
4077 | /* Restore the argument vectors to their full size. */ | |
4078 | TREE_VEC_LENGTH (arglist)++; | |
4079 | TREE_VEC_LENGTH (TREE_PURPOSE (found))++; | |
4080 | ||
4081 | if (success) | |
4082 | { | |
4083 | found = tmpl; | |
4084 | break; | |
4085 | } | |
4086 | } | |
4087 | ||
4088 | if (!found) | |
ab097535 NS |
4089 | { |
4090 | /* There was no partial instantiation. This happens | |
4091 | where C<T> is a member template of A<T> and it's used | |
4092 | in something like | |
4093 | ||
4094 | template <typename T> struct B { A<T>::C<int> m; }; | |
4095 | B<float>; | |
4096 | ||
4097 | Create the partial instantiation. | |
4098 | */ | |
4099 | TREE_VEC_LENGTH (arglist)--; | |
4100 | template = tsubst (template, arglist, /*complain=*/0, NULL_TREE); | |
4101 | TREE_VEC_LENGTH (arglist)++; | |
4102 | found = template; | |
4103 | } | |
9fbf56f7 MM |
4104 | } |
4105 | ||
ab097535 | 4106 | SET_TYPE_TEMPLATE_INFO (t, tree_cons (found, arglist, NULL_TREE)); |
dbfe2124 MM |
4107 | DECL_TEMPLATE_INSTANTIATIONS (template) |
4108 | = tree_cons (arglist, t, | |
4109 | DECL_TEMPLATE_INSTANTIATIONS (template)); | |
4110 | ||
4111 | if (TREE_CODE (t) == ENUMERAL_TYPE | |
4112 | && !is_partial_instantiation) | |
61a127b3 MM |
4113 | /* Now that the type has been registered on the instantiations |
4114 | list, we set up the enumerators. Because the enumeration | |
4115 | constants may involve the enumeration type itself, we make | |
4116 | sure to register the type first, and then create the | |
4117 | constants. That way, doing tsubst_expr for the enumeration | |
4118 | constants won't result in recursive calls here; we'll find | |
4119 | the instantiation and exit above. */ | |
4120 | tsubst_enum (template_type, t, arglist); | |
dbfe2124 | 4121 | |
36a117a5 MM |
4122 | /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO |
4123 | is set up. */ | |
ed44da02 MM |
4124 | if (TREE_CODE (t) != ENUMERAL_TYPE) |
4125 | DECL_NAME (type_decl) = classtype_mangled_name (t); | |
36a117a5 | 4126 | DECL_ASSEMBLER_NAME (type_decl) = DECL_NAME (type_decl); |
dbfe2124 | 4127 | if (!is_partial_instantiation) |
36a117a5 | 4128 | { |
669ec2b4 JM |
4129 | if (flag_new_abi) |
4130 | DECL_ASSEMBLER_NAME (type_decl) = mangle_decl (type_decl); | |
4131 | else | |
4132 | DECL_ASSEMBLER_NAME (type_decl) | |
4133 | = get_identifier (build_overload_name (t, 1, 1)); | |
50a6dbd7 JM |
4134 | |
4135 | /* For backwards compatibility; code that uses | |
4136 | -fexternal-templates expects looking up a template to | |
4137 | instantiate it. I think DDD still relies on this. | |
4138 | (jason 8/20/1998) */ | |
ed44da02 MM |
4139 | if (TREE_CODE (t) != ENUMERAL_TYPE |
4140 | && flag_external_templates | |
36a117a5 MM |
4141 | && CLASSTYPE_INTERFACE_KNOWN (TREE_TYPE (template)) |
4142 | && ! CLASSTYPE_INTERFACE_ONLY (TREE_TYPE (template))) | |
4143 | add_pending_template (t); | |
4144 | } | |
4145 | else | |
077e7015 MM |
4146 | /* If the type makes use of template parameters, the |
4147 | code that generates debugging information will crash. */ | |
4148 | DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1; | |
8d08fdba | 4149 | |
36a117a5 MM |
4150 | return t; |
4151 | } | |
8d08fdba MS |
4152 | } |
4153 | \f | |
8dfaeb63 | 4154 | struct pair_fn_data |
8d08fdba | 4155 | { |
8dfaeb63 MM |
4156 | tree_fn_t fn; |
4157 | void *data; | |
4158 | }; | |
4159 | ||
4160 | /* Called from for_each_template_parm via walk_tree. */ | |
581d38d0 | 4161 | |
8dfaeb63 MM |
4162 | static tree |
4163 | for_each_template_parm_r (tp, walk_subtrees, d) | |
4164 | tree *tp; | |
4165 | int *walk_subtrees; | |
4166 | void *d; | |
4167 | { | |
4168 | tree t = *tp; | |
4169 | struct pair_fn_data *pfd = (struct pair_fn_data *) d; | |
4170 | tree_fn_t fn = pfd->fn; | |
4171 | void *data = pfd->data; | |
4172 | ||
2f939d94 | 4173 | if (TYPE_P (t) |
581d38d0 | 4174 | && for_each_template_parm (TYPE_CONTEXT (t), fn, data)) |
8dfaeb63 | 4175 | return error_mark_node; |
581d38d0 | 4176 | |
8d08fdba MS |
4177 | switch (TREE_CODE (t)) |
4178 | { | |
8d08fdba | 4179 | case RECORD_TYPE: |
9076e292 | 4180 | if (TYPE_PTRMEMFUNC_P (t)) |
8dfaeb63 | 4181 | break; |
ed44da02 MM |
4182 | /* Fall through. */ |
4183 | ||
8d08fdba | 4184 | case UNION_TYPE: |
ed44da02 | 4185 | case ENUMERAL_TYPE: |
8dfaeb63 MM |
4186 | if (!TYPE_TEMPLATE_INFO (t)) |
4187 | *walk_subtrees = 0; | |
4188 | else if (for_each_template_parm (TREE_VALUE (TYPE_TEMPLATE_INFO (t)), | |
4189 | fn, data)) | |
4190 | return error_mark_node; | |
4191 | break; | |
4192 | ||
588c2d1c | 4193 | case METHOD_TYPE: |
8dfaeb63 MM |
4194 | /* Since we're not going to walk subtrees, we have to do this |
4195 | explicitly here. */ | |
588c2d1c | 4196 | if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data)) |
8dfaeb63 | 4197 | return error_mark_node; |
588c2d1c MM |
4198 | |
4199 | case FUNCTION_TYPE: | |
8dfaeb63 MM |
4200 | /* Check the return type. */ |
4201 | if (for_each_template_parm (TREE_TYPE (t), fn, data)) | |
4202 | return error_mark_node; | |
4203 | ||
588c2d1c MM |
4204 | /* Check the parameter types. Since default arguments are not |
4205 | instantiated until they are needed, the TYPE_ARG_TYPES may | |
4206 | contain expressions that involve template parameters. But, | |
4207 | no-one should be looking at them yet. And, once they're | |
4208 | instantiated, they don't contain template parameters, so | |
4209 | there's no point in looking at them then, either. */ | |
4210 | { | |
4211 | tree parm; | |
4212 | ||
4213 | for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm)) | |
4214 | if (for_each_template_parm (TREE_VALUE (parm), fn, data)) | |
8dfaeb63 | 4215 | return error_mark_node; |
5566b478 | 4216 | |
8dfaeb63 MM |
4217 | /* Since we've already handled the TYPE_ARG_TYPES, we don't |
4218 | want walk_tree walking into them itself. */ | |
4219 | *walk_subtrees = 0; | |
4220 | } | |
4221 | break; | |
3ac3d9ea | 4222 | |
8d08fdba | 4223 | case FUNCTION_DECL: |
5566b478 | 4224 | case VAR_DECL: |
5566b478 | 4225 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t) |
050367a3 | 4226 | && for_each_template_parm (DECL_TI_ARGS (t), fn, data)) |
8dfaeb63 MM |
4227 | return error_mark_node; |
4228 | /* Fall through. */ | |
4229 | ||
4230 | case CONST_DECL: | |
8d08fdba | 4231 | case PARM_DECL: |
050367a3 MM |
4232 | if (DECL_CONTEXT (t) |
4233 | && for_each_template_parm (DECL_CONTEXT (t), fn, data)) | |
8dfaeb63 MM |
4234 | return error_mark_node; |
4235 | break; | |
8d08fdba | 4236 | |
a1281f45 | 4237 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
744fac59 | 4238 | /* Record template parameters such as `T' inside `TT<T>'. */ |
a1281f45 | 4239 | if (for_each_template_parm (TYPE_TI_ARGS (t), fn, data)) |
8dfaeb63 MM |
4240 | return error_mark_node; |
4241 | /* Fall through. */ | |
4242 | ||
a1281f45 | 4243 | case TEMPLATE_TEMPLATE_PARM: |
744fac59 | 4244 | case TEMPLATE_TYPE_PARM: |
f84b4be9 | 4245 | case TEMPLATE_PARM_INDEX: |
8dfaeb63 MM |
4246 | if (fn && (*fn)(t, data)) |
4247 | return error_mark_node; | |
4248 | else if (!fn) | |
4249 | return error_mark_node; | |
4250 | break; | |
5156628f | 4251 | |
8dfaeb63 MM |
4252 | case TEMPLATE_DECL: |
4253 | /* A template template parameter is encountered */ | |
4254 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t) | |
4255 | && for_each_template_parm (TREE_TYPE (t), fn, data)) | |
4256 | return error_mark_node; | |
db5ae43f | 4257 | |
8dfaeb63 MM |
4258 | /* Already substituted template template parameter */ |
4259 | *walk_subtrees = 0; | |
4260 | break; | |
b8865407 | 4261 | |
4699c561 | 4262 | case TYPENAME_TYPE: |
8dfaeb63 MM |
4263 | if (!fn || for_each_template_parm (TYPENAME_TYPE_FULLNAME (t), fn, data)) |
4264 | return error_mark_node; | |
4265 | break; | |
4699c561 | 4266 | |
8dfaeb63 MM |
4267 | case CONSTRUCTOR: |
4268 | if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)) | |
4269 | && for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE | |
4270 | (TREE_TYPE (t)), fn, data)) | |
4271 | return error_mark_node; | |
4272 | break; | |
4273 | ||
b8865407 MM |
4274 | case INDIRECT_REF: |
4275 | case COMPONENT_REF: | |
4699c561 | 4276 | /* If there's no type, then this thing must be some expression |
b8865407 | 4277 | involving template parameters. */ |
4699c561 | 4278 | if (!fn && !TREE_TYPE (t)) |
8dfaeb63 MM |
4279 | return error_mark_node; |
4280 | break; | |
b8865407 | 4281 | |
42976354 BK |
4282 | case MODOP_EXPR: |
4283 | case CAST_EXPR: | |
4284 | case REINTERPRET_CAST_EXPR: | |
4285 | case CONST_CAST_EXPR: | |
4286 | case STATIC_CAST_EXPR: | |
4287 | case DYNAMIC_CAST_EXPR: | |
42976354 BK |
4288 | case ARROW_EXPR: |
4289 | case DOTSTAR_EXPR: | |
4290 | case TYPEID_EXPR: | |
b8865407 | 4291 | case LOOKUP_EXPR: |
40242ccf | 4292 | case PSEUDO_DTOR_EXPR: |
b8865407 | 4293 | if (!fn) |
8dfaeb63 MM |
4294 | return error_mark_node; |
4295 | break; | |
abff8e06 | 4296 | |
8d08fdba | 4297 | default: |
8dfaeb63 | 4298 | break; |
8d08fdba | 4299 | } |
8dfaeb63 MM |
4300 | |
4301 | /* We didn't find any template parameters we liked. */ | |
4302 | return NULL_TREE; | |
4303 | } | |
4304 | ||
a1281f45 KL |
4305 | /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM, |
4306 | BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T, | |
4307 | call FN with the parameter and the DATA. | |
8dfaeb63 MM |
4308 | If FN returns non-zero, the iteration is terminated, and |
4309 | for_each_template_parm returns 1. Otherwise, the iteration | |
4310 | continues. If FN never returns a non-zero value, the value | |
4311 | returned by for_each_template_parm is 0. If FN is NULL, it is | |
4312 | considered to be the function which always returns 1. */ | |
4313 | ||
4314 | static int | |
4315 | for_each_template_parm (t, fn, data) | |
4316 | tree t; | |
4317 | tree_fn_t fn; | |
4318 | void* data; | |
4319 | { | |
4320 | struct pair_fn_data pfd; | |
4321 | ||
4322 | /* Set up. */ | |
4323 | pfd.fn = fn; | |
4324 | pfd.data = data; | |
4325 | ||
4326 | /* Walk the tree. */ | |
ee94fce6 MM |
4327 | return walk_tree_without_duplicates (&t, |
4328 | for_each_template_parm_r, | |
4329 | &pfd) != NULL_TREE; | |
8d08fdba MS |
4330 | } |
4331 | ||
050367a3 MM |
4332 | int |
4333 | uses_template_parms (t) | |
4334 | tree t; | |
4335 | { | |
4336 | return for_each_template_parm (t, 0, 0); | |
4337 | } | |
4338 | ||
27fafc8d | 4339 | static int tinst_depth; |
e9f32eb5 | 4340 | extern int max_tinst_depth; |
5566b478 | 4341 | #ifdef GATHER_STATISTICS |
27fafc8d | 4342 | int depth_reached; |
5566b478 | 4343 | #endif |
8dfaeb63 MM |
4344 | static int tinst_level_tick; |
4345 | static int last_template_error_tick; | |
8d08fdba | 4346 | |
3ae18eaf JM |
4347 | /* We're starting to instantiate D; record the template instantiation context |
4348 | for diagnostics and to restore it later. */ | |
4349 | ||
bd6dd845 | 4350 | static int |
5566b478 MS |
4351 | push_tinst_level (d) |
4352 | tree d; | |
8d08fdba | 4353 | { |
3ae18eaf | 4354 | tree new; |
8d08fdba | 4355 | |
7215f9a0 MS |
4356 | if (tinst_depth >= max_tinst_depth) |
4357 | { | |
8adf5b5e JM |
4358 | /* If the instantiation in question still has unbound template parms, |
4359 | we don't really care if we can't instantiate it, so just return. | |
4360 | This happens with base instantiation for implicit `typename'. */ | |
4361 | if (uses_template_parms (d)) | |
4362 | return 0; | |
4363 | ||
1139b3d8 | 4364 | last_template_error_tick = tinst_level_tick; |
b4f4233d GDR |
4365 | cp_error ("template instantiation depth exceeds maximum of %d (use -ftemplate-depth-NN to increase the maximum) instantiating `%D'", |
4366 | max_tinst_depth, d); | |
5566b478 | 4367 | |
cb753e49 | 4368 | print_instantiation_context (); |
5566b478 | 4369 | |
7215f9a0 MS |
4370 | return 0; |
4371 | } | |
4372 | ||
3ae18eaf JM |
4373 | new = build_expr_wfl (d, input_filename, lineno, 0); |
4374 | TREE_CHAIN (new) = current_tinst_level; | |
8d08fdba | 4375 | current_tinst_level = new; |
5566b478 | 4376 | |
7215f9a0 | 4377 | ++tinst_depth; |
5566b478 MS |
4378 | #ifdef GATHER_STATISTICS |
4379 | if (tinst_depth > depth_reached) | |
4380 | depth_reached = tinst_depth; | |
4381 | #endif | |
4382 | ||
27fafc8d | 4383 | ++tinst_level_tick; |
7215f9a0 | 4384 | return 1; |
8d08fdba MS |
4385 | } |
4386 | ||
3ae18eaf JM |
4387 | /* We're done instantiating this template; return to the instantiation |
4388 | context. */ | |
4389 | ||
8d08fdba MS |
4390 | void |
4391 | pop_tinst_level () | |
4392 | { | |
3ae18eaf | 4393 | tree old = current_tinst_level; |
8d08fdba | 4394 | |
ae58fa02 MM |
4395 | /* Restore the filename and line number stashed away when we started |
4396 | this instantiation. */ | |
3ae18eaf JM |
4397 | lineno = TINST_LINE (old); |
4398 | input_filename = TINST_FILE (old); | |
5f2c99c4 | 4399 | extract_interface_info (); |
ae58fa02 | 4400 | |
3ae18eaf | 4401 | current_tinst_level = TREE_CHAIN (old); |
7215f9a0 | 4402 | --tinst_depth; |
27fafc8d | 4403 | ++tinst_level_tick; |
8d08fdba MS |
4404 | } |
4405 | ||
3ae18eaf JM |
4406 | /* We're instantiating a deferred template; restore the template |
4407 | instantiation context in which the instantiation was requested, which | |
4408 | is one step out from LEVEL. */ | |
4409 | ||
4410 | static void | |
4411 | reopen_tinst_level (level) | |
4412 | tree level; | |
4413 | { | |
4414 | tree t; | |
4415 | ||
4416 | tinst_depth = 0; | |
4417 | for (t = level; t; t = TREE_CHAIN (t)) | |
4418 | ++tinst_depth; | |
4419 | ||
4420 | current_tinst_level = level; | |
4421 | pop_tinst_level (); | |
4422 | } | |
4423 | ||
4424 | /* Return the outermost template instantiation context, for use with | |
4425 | -falt-external-templates. */ | |
4426 | ||
4427 | tree | |
8d08fdba MS |
4428 | tinst_for_decl () |
4429 | { | |
3ae18eaf | 4430 | tree p = current_tinst_level; |
8d08fdba MS |
4431 | |
4432 | if (p) | |
3ae18eaf | 4433 | for (; TREE_CHAIN (p) ; p = TREE_CHAIN (p)) |
8d08fdba MS |
4434 | ; |
4435 | return p; | |
4436 | } | |
4437 | ||
f84b4be9 JM |
4438 | /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the |
4439 | vector of template arguments, as for tsubst. | |
4440 | ||
dc957d14 | 4441 | Returns an appropriate tsubst'd friend declaration. */ |
f84b4be9 JM |
4442 | |
4443 | static tree | |
4444 | tsubst_friend_function (decl, args) | |
4445 | tree decl; | |
4446 | tree args; | |
4447 | { | |
4448 | tree new_friend; | |
27fafc8d | 4449 | int line = lineno; |
3b304f5b | 4450 | const char *file = input_filename; |
27fafc8d JM |
4451 | |
4452 | lineno = DECL_SOURCE_LINE (decl); | |
4453 | input_filename = DECL_SOURCE_FILE (decl); | |
4454 | ||
f84b4be9 JM |
4455 | if (TREE_CODE (decl) == FUNCTION_DECL |
4456 | && DECL_TEMPLATE_INSTANTIATION (decl) | |
4457 | && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) | |
4458 | /* This was a friend declared with an explicit template | |
4459 | argument list, e.g.: | |
4460 | ||
4461 | friend void f<>(T); | |
4462 | ||
4463 | to indicate that f was a template instantiation, not a new | |
4464 | function declaration. Now, we have to figure out what | |
4465 | instantiation of what template. */ | |
4466 | { | |
76e57b45 | 4467 | tree template_id, arglist, fns; |
f84b4be9 JM |
4468 | tree new_args; |
4469 | tree tmpl; | |
76e57b45 NS |
4470 | tree ns = CP_DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
4471 | ||
4472 | /* Friend functions are looked up in the containing namespace scope. | |
4473 | We must enter that scope, to avoid finding member functions of the | |
4474 | current cless with same name. */ | |
4475 | push_nested_namespace (ns); | |
4476 | fns = tsubst_expr (DECL_TI_TEMPLATE (decl), args, | |
4477 | /*complain=*/1, NULL_TREE); | |
4478 | pop_nested_namespace (ns); | |
4479 | arglist = tsubst (DECL_TI_ARGS (decl), args, | |
4480 | /*complain=*/1, NULL_TREE); | |
4481 | template_id = lookup_template_function (fns, arglist); | |
4482 | ||
4393e105 | 4483 | new_friend = tsubst (decl, args, /*complain=*/1, NULL_TREE); |
36a117a5 MM |
4484 | tmpl = determine_specialization (template_id, new_friend, |
4485 | &new_args, | |
bf8f3f93 | 4486 | /*need_member_template=*/0); |
27fafc8d JM |
4487 | new_friend = instantiate_template (tmpl, new_args); |
4488 | goto done; | |
f84b4be9 | 4489 | } |
36a117a5 | 4490 | |
4393e105 | 4491 | new_friend = tsubst (decl, args, /*complain=*/1, NULL_TREE); |
f84b4be9 | 4492 | |
36a117a5 | 4493 | /* The NEW_FRIEND will look like an instantiation, to the |
f84b4be9 JM |
4494 | compiler, but is not an instantiation from the point of view of |
4495 | the language. For example, we might have had: | |
4496 | ||
4497 | template <class T> struct S { | |
4498 | template <class U> friend void f(T, U); | |
4499 | }; | |
4500 | ||
4501 | Then, in S<int>, template <class U> void f(int, U) is not an | |
4502 | instantiation of anything. */ | |
4503 | DECL_USE_TEMPLATE (new_friend) = 0; | |
4504 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
655dc6ee JM |
4505 | { |
4506 | DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0; | |
4507 | DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend)) | |
4508 | = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl)); | |
4509 | } | |
36a117a5 MM |
4510 | |
4511 | /* The mangled name for the NEW_FRIEND is incorrect. The call to | |
669ec2b4 JM |
4512 | tsubst will have resulted in a call to |
4513 | set_mangled_name_for_template_decl. But, the function is not a | |
4514 | template instantiation and should not be mangled like one. | |
4515 | Therefore, we remangle the function name. We don't have to do | |
4516 | this if the NEW_FRIEND is a template since | |
36a117a5 MM |
4517 | set_mangled_name_for_template_decl doesn't do anything if the |
4518 | function declaration still uses template arguments. */ | |
4519 | if (TREE_CODE (new_friend) != TEMPLATE_DECL) | |
4520 | { | |
4521 | set_mangled_name_for_decl (new_friend); | |
4522 | DECL_RTL (new_friend) = 0; | |
4523 | make_decl_rtl (new_friend, NULL_PTR, 1); | |
4524 | } | |
4525 | ||
6eb3bb27 | 4526 | if (DECL_NAMESPACE_SCOPE_P (new_friend)) |
f84b4be9 | 4527 | { |
36a117a5 | 4528 | tree old_decl; |
fbf1c34b MM |
4529 | tree new_friend_template_info; |
4530 | tree new_friend_result_template_info; | |
92da7074 | 4531 | tree ns; |
fbf1c34b MM |
4532 | int new_friend_is_defn; |
4533 | ||
4534 | /* We must save some information from NEW_FRIEND before calling | |
4535 | duplicate decls since that function will free NEW_FRIEND if | |
4536 | possible. */ | |
4537 | new_friend_template_info = DECL_TEMPLATE_INFO (new_friend); | |
f84b4be9 | 4538 | if (TREE_CODE (new_friend) == TEMPLATE_DECL) |
fbf1c34b MM |
4539 | { |
4540 | /* This declaration is a `primary' template. */ | |
4541 | DECL_PRIMARY_TEMPLATE (new_friend) = new_friend; | |
4542 | ||
4543 | new_friend_is_defn | |
17aec3eb | 4544 | = DECL_INITIAL (DECL_TEMPLATE_RESULT (new_friend)) != NULL_TREE; |
fbf1c34b | 4545 | new_friend_result_template_info |
17aec3eb | 4546 | = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend)); |
fbf1c34b MM |
4547 | } |
4548 | else | |
4549 | { | |
4550 | new_friend_is_defn = DECL_INITIAL (new_friend) != NULL_TREE; | |
4551 | new_friend_result_template_info = NULL_TREE; | |
4552 | } | |
36a117a5 | 4553 | |
1c227897 MM |
4554 | /* Inside pushdecl_namespace_level, we will push into the |
4555 | current namespace. However, the friend function should go | |
4556 | into the namespace of the template. */ | |
92da7074 ML |
4557 | ns = decl_namespace_context (new_friend); |
4558 | push_nested_namespace (ns); | |
36a117a5 | 4559 | old_decl = pushdecl_namespace_level (new_friend); |
92da7074 | 4560 | pop_nested_namespace (ns); |
36a117a5 MM |
4561 | |
4562 | if (old_decl != new_friend) | |
4563 | { | |
4564 | /* This new friend declaration matched an existing | |
4565 | declaration. For example, given: | |
4566 | ||
4567 | template <class T> void f(T); | |
4568 | template <class U> class C { | |
4569 | template <class T> friend void f(T) {} | |
4570 | }; | |
4571 | ||
4572 | the friend declaration actually provides the definition | |
4573 | of `f', once C has been instantiated for some type. So, | |
4574 | old_decl will be the out-of-class template declaration, | |
4575 | while new_friend is the in-class definition. | |
4576 | ||
4577 | But, if `f' was called before this point, the | |
4578 | instantiation of `f' will have DECL_TI_ARGS corresponding | |
4579 | to `T' but not to `U', references to which might appear | |
4580 | in the definition of `f'. Previously, the most general | |
4581 | template for an instantiation of `f' was the out-of-class | |
4582 | version; now it is the in-class version. Therefore, we | |
4583 | run through all specialization of `f', adding to their | |
4584 | DECL_TI_ARGS appropriately. In particular, they need a | |
4585 | new set of outer arguments, corresponding to the | |
4586 | arguments for this class instantiation. | |
4587 | ||
4588 | The same situation can arise with something like this: | |
4589 | ||
4590 | friend void f(int); | |
4591 | template <class T> class C { | |
4592 | friend void f(T) {} | |
4593 | }; | |
4594 | ||
4595 | when `C<int>' is instantiated. Now, `f(int)' is defined | |
4596 | in the class. */ | |
4597 | ||
fbf1c34b MM |
4598 | if (!new_friend_is_defn) |
4599 | /* On the other hand, if the in-class declaration does | |
4600 | *not* provide a definition, then we don't want to alter | |
4601 | existing definitions. We can just leave everything | |
4602 | alone. */ | |
36a117a5 | 4603 | ; |
fbf1c34b | 4604 | else |
36a117a5 | 4605 | { |
fbf1c34b MM |
4606 | /* Overwrite whatever template info was there before, if |
4607 | any, with the new template information pertaining to | |
4608 | the declaration. */ | |
4609 | DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info; | |
4610 | ||
4611 | if (TREE_CODE (old_decl) != TEMPLATE_DECL) | |
4612 | /* duplicate_decls will take care of this case. */ | |
4613 | ; | |
4614 | else | |
36a117a5 | 4615 | { |
fbf1c34b MM |
4616 | tree t; |
4617 | tree new_friend_args; | |
4618 | ||
17aec3eb | 4619 | DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl)) |
fbf1c34b MM |
4620 | = new_friend_result_template_info; |
4621 | ||
4622 | new_friend_args = TI_ARGS (new_friend_template_info); | |
4623 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl); | |
4624 | t != NULL_TREE; | |
4625 | t = TREE_CHAIN (t)) | |
4626 | { | |
4627 | tree spec = TREE_VALUE (t); | |
36a117a5 | 4628 | |
fbf1c34b MM |
4629 | DECL_TI_ARGS (spec) |
4630 | = add_outermost_template_args (new_friend_args, | |
4631 | DECL_TI_ARGS (spec)); | |
fbf1c34b MM |
4632 | } |
4633 | ||
4634 | /* Now, since specializations are always supposed to | |
4635 | hang off of the most general template, we must move | |
4636 | them. */ | |
4637 | t = most_general_template (old_decl); | |
4638 | if (t != old_decl) | |
4639 | { | |
4640 | DECL_TEMPLATE_SPECIALIZATIONS (t) | |
4641 | = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t), | |
4642 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl)); | |
4643 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE; | |
4644 | } | |
36a117a5 MM |
4645 | } |
4646 | } | |
4647 | ||
4648 | /* The information from NEW_FRIEND has been merged into OLD_DECL | |
4649 | by duplicate_decls. */ | |
4650 | new_friend = old_decl; | |
4651 | } | |
f84b4be9 | 4652 | } |
d0f062fb | 4653 | else if (COMPLETE_TYPE_P (DECL_CONTEXT (new_friend))) |
f84b4be9 JM |
4654 | { |
4655 | /* Check to see that the declaration is really present, and, | |
4656 | possibly obtain an improved declaration. */ | |
4657 | tree fn = check_classfn (DECL_CONTEXT (new_friend), | |
4658 | new_friend); | |
4659 | ||
4660 | if (fn) | |
4661 | new_friend = fn; | |
4662 | } | |
4663 | ||
27fafc8d JM |
4664 | done: |
4665 | lineno = line; | |
4666 | input_filename = file; | |
f84b4be9 JM |
4667 | return new_friend; |
4668 | } | |
4669 | ||
1aed5355 MM |
4670 | /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of |
4671 | template arguments, as for tsubst. | |
6757edfe | 4672 | |
dc957d14 | 4673 | Returns an appropriate tsubst'd friend type or error_mark_node on |
4b054b80 | 4674 | failure. */ |
6757edfe MM |
4675 | |
4676 | static tree | |
1aed5355 MM |
4677 | tsubst_friend_class (friend_tmpl, args) |
4678 | tree friend_tmpl; | |
6757edfe MM |
4679 | tree args; |
4680 | { | |
1aed5355 | 4681 | tree friend_type; |
25aab5d0 | 4682 | tree tmpl; |
6757edfe | 4683 | |
25aab5d0 MM |
4684 | /* First, we look for a class template. */ |
4685 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/0); | |
4686 | ||
4687 | /* But, if we don't find one, it might be because we're in a | |
4688 | situation like this: | |
4689 | ||
4690 | template <class T> | |
4691 | struct S { | |
4692 | template <class U> | |
4693 | friend struct S; | |
4694 | }; | |
4695 | ||
4696 | Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL | |
4697 | for `S<int>', not the TEMPLATE_DECL. */ | |
bc639f90 | 4698 | if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl)) |
25aab5d0 MM |
4699 | { |
4700 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/1); | |
4701 | tmpl = maybe_get_template_decl_from_type_decl (tmpl); | |
4702 | } | |
6757edfe | 4703 | |
25aab5d0 | 4704 | if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl)) |
6757edfe MM |
4705 | { |
4706 | /* The friend template has already been declared. Just | |
36a117a5 MM |
4707 | check to see that the declarations match, and install any new |
4708 | default parameters. We must tsubst the default parameters, | |
4709 | of course. We only need the innermost template parameters | |
4710 | because that is all that redeclare_class_template will look | |
4711 | at. */ | |
4712 | tree parms | |
4713 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl), | |
4393e105 | 4714 | args, /*complain=*/1); |
4b054b80 NS |
4715 | if (!parms) |
4716 | return error_mark_node; | |
36a117a5 | 4717 | redeclare_class_template (TREE_TYPE (tmpl), parms); |
6757edfe MM |
4718 | friend_type = TREE_TYPE (tmpl); |
4719 | } | |
4720 | else | |
4721 | { | |
4722 | /* The friend template has not already been declared. In this | |
4723 | case, the instantiation of the template class will cause the | |
4724 | injection of this template into the global scope. */ | |
4393e105 | 4725 | tmpl = tsubst (friend_tmpl, args, /*complain=*/1, NULL_TREE); |
6757edfe MM |
4726 | |
4727 | /* The new TMPL is not an instantiation of anything, so we | |
4728 | forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for | |
4729 | the new type because that is supposed to be the corresponding | |
4730 | template decl, i.e., TMPL. */ | |
4731 | DECL_USE_TEMPLATE (tmpl) = 0; | |
4732 | DECL_TEMPLATE_INFO (tmpl) = NULL_TREE; | |
4733 | CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0; | |
4734 | ||
4735 | /* Inject this template into the global scope. */ | |
4736 | friend_type = TREE_TYPE (pushdecl_top_level (tmpl)); | |
4737 | } | |
4738 | ||
4739 | return friend_type; | |
4740 | } | |
f84b4be9 | 4741 | |
8d08fdba | 4742 | tree |
5566b478 MS |
4743 | instantiate_class_template (type) |
4744 | tree type; | |
8d08fdba | 4745 | { |
61a127b3 | 4746 | tree template, args, pattern, t; |
36a117a5 | 4747 | tree typedecl; |
8d08fdba | 4748 | |
5566b478 | 4749 | if (type == error_mark_node) |
8d08fdba MS |
4750 | return error_mark_node; |
4751 | ||
d0f062fb | 4752 | if (TYPE_BEING_DEFINED (type) || COMPLETE_TYPE_P (type)) |
5566b478 MS |
4753 | return type; |
4754 | ||
6bdb985f | 4755 | /* Figure out which template is being instantiated. */ |
36a117a5 | 4756 | template = most_general_template (CLASSTYPE_TI_TEMPLATE (type)); |
5566b478 | 4757 | my_friendly_assert (TREE_CODE (template) == TEMPLATE_DECL, 279); |
73aad9b9 | 4758 | |
6bdb985f MM |
4759 | /* Figure out which arguments are being used to do the |
4760 | instantiation. */ | |
4761 | args = CLASSTYPE_TI_ARGS (type); | |
4c571114 | 4762 | PARTIAL_INSTANTIATION_P (type) = uses_template_parms (args); |
6bdb985f | 4763 | |
4c571114 MM |
4764 | if (pedantic && PARTIAL_INSTANTIATION_P (type)) |
4765 | /* If this is a partial instantiation, then we can't instantiate | |
4766 | the type; there's no telling whether or not one of the | |
4767 | template parameters might eventually be instantiated to some | |
4768 | value that results in a specialization being used. For | |
4769 | example, consider: | |
4770 | ||
4771 | template <class T> | |
4772 | struct S {}; | |
4773 | ||
4774 | template <class U> | |
4775 | void f(S<U>); | |
4776 | ||
4777 | template <> | |
4778 | struct S<int> {}; | |
4779 | ||
4780 | Now, the `S<U>' in `f<int>' is the specialization, not an | |
5db698f6 | 4781 | instantiation of the original template. */ |
f31c0a32 | 4782 | return type; |
4c571114 MM |
4783 | |
4784 | /* Determine what specialization of the original template to | |
4785 | instantiate. */ | |
4786 | if (PARTIAL_INSTANTIATION_P (type)) | |
6bdb985f MM |
4787 | /* There's no telling which specialization is appropriate at this |
4788 | point. Since all peeking at the innards of this partial | |
4789 | instantiation are extensions (like the "implicit typename" | |
4790 | extension, which allows users to omit the keyword `typename' on | |
4791 | names that are declared as types in template base classes), we | |
4792 | are free to do what we please. | |
4793 | ||
4794 | Trying to figure out which partial instantiation to use can | |
4795 | cause a crash. (Some of the template arguments don't even have | |
4796 | types.) So, we just use the most general version. */ | |
4797 | t = NULL_TREE; | |
4798 | else | |
73aad9b9 | 4799 | { |
6bdb985f MM |
4800 | t = most_specialized_class (template, args); |
4801 | ||
4802 | if (t == error_mark_node) | |
73aad9b9 | 4803 | { |
d8e178a0 | 4804 | const char *str = "candidates are:"; |
6bdb985f MM |
4805 | cp_error ("ambiguous class template instantiation for `%#T'", type); |
4806 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t; | |
4807 | t = TREE_CHAIN (t)) | |
73aad9b9 | 4808 | { |
6bdb985f MM |
4809 | if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), |
4810 | args)) | |
4811 | { | |
4812 | cp_error_at ("%s %+#T", str, TREE_TYPE (t)); | |
4813 | str = " "; | |
4814 | } | |
73aad9b9 | 4815 | } |
6bdb985f | 4816 | TYPE_BEING_DEFINED (type) = 1; |
f31c0a32 | 4817 | return error_mark_node; |
73aad9b9 | 4818 | } |
73aad9b9 | 4819 | } |
6bdb985f MM |
4820 | |
4821 | if (t) | |
73aad9b9 JM |
4822 | pattern = TREE_TYPE (t); |
4823 | else | |
4824 | pattern = TREE_TYPE (template); | |
5566b478 | 4825 | |
4c571114 MM |
4826 | /* If the template we're instantiating is incomplete, then clearly |
4827 | there's nothing we can do. */ | |
d0f062fb | 4828 | if (!COMPLETE_TYPE_P (pattern)) |
f31c0a32 | 4829 | return type; |
5566b478 | 4830 | |
4c571114 MM |
4831 | /* If this is a partial instantiation, don't tsubst anything. We will |
4832 | only use this type for implicit typename, so the actual contents don't | |
4833 | matter. All that matters is whether a particular name is a type. */ | |
4834 | if (PARTIAL_INSTANTIATION_P (type)) | |
4835 | { | |
4836 | /* The fields set here must be kept in sync with those cleared | |
4837 | in begin_class_definition. */ | |
4838 | TYPE_BINFO_BASETYPES (type) = TYPE_BINFO_BASETYPES (pattern); | |
4839 | TYPE_FIELDS (type) = TYPE_FIELDS (pattern); | |
4840 | TYPE_METHODS (type) = TYPE_METHODS (pattern); | |
4841 | CLASSTYPE_TAGS (type) = CLASSTYPE_TAGS (pattern); | |
1ddd4323 NS |
4842 | CLASSTYPE_VBASECLASSES (type) = CLASSTYPE_VBASECLASSES (pattern); |
4843 | ||
4c571114 MM |
4844 | /* Pretend that the type is complete, so that we will look |
4845 | inside it during name lookup and such. */ | |
867580ce | 4846 | TYPE_SIZE (type) = bitsize_zero_node; |
f31c0a32 | 4847 | return type; |
4c571114 MM |
4848 | } |
4849 | ||
4850 | /* If we've recursively instantiated too many templates, stop. */ | |
4851 | if (! push_tinst_level (type)) | |
f31c0a32 | 4852 | return type; |
4c571114 MM |
4853 | |
4854 | /* Now we're really doing the instantiation. Mark the type as in | |
4855 | the process of being defined. */ | |
4856 | TYPE_BEING_DEFINED (type) = 1; | |
4857 | ||
4858 | maybe_push_to_top_level (uses_template_parms (type)); | |
4c571114 | 4859 | |
73aad9b9 | 4860 | if (t) |
36a117a5 MM |
4861 | { |
4862 | /* This TYPE is actually a instantiation of of a partial | |
4863 | specialization. We replace the innermost set of ARGS with | |
4864 | the arguments appropriate for substitution. For example, | |
4865 | given: | |
4866 | ||
4867 | template <class T> struct S {}; | |
4868 | template <class T> struct S<T*> {}; | |
4869 | ||
4870 | and supposing that we are instantiating S<int*>, ARGS will | |
4871 | present be {int*} but we need {int}. */ | |
4872 | tree inner_args | |
4873 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), | |
4874 | args); | |
4875 | ||
4876 | /* If there were multiple levels in ARGS, replacing the | |
4877 | innermost level would alter CLASSTYPE_TI_ARGS, which we don't | |
4878 | want, so we make a copy first. */ | |
4879 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args)) | |
4880 | { | |
4881 | args = copy_node (args); | |
4882 | SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args); | |
4883 | } | |
4884 | else | |
4885 | args = inner_args; | |
4886 | } | |
8d019cef | 4887 | |
5566b478 MS |
4888 | if (flag_external_templates) |
4889 | { | |
4890 | if (flag_alt_external_templates) | |
4891 | { | |
4892 | CLASSTYPE_INTERFACE_ONLY (type) = interface_only; | |
4893 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X (type, interface_unknown); | |
4894 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4895 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4896 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4897 | } |
4898 | else | |
4899 | { | |
4900 | CLASSTYPE_INTERFACE_ONLY (type) = CLASSTYPE_INTERFACE_ONLY (pattern); | |
4901 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X | |
4902 | (type, CLASSTYPE_INTERFACE_UNKNOWN (pattern)); | |
4903 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4904 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4905 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4906 | } |
4907 | } | |
4908 | else | |
8d08fdba | 4909 | { |
5566b478 MS |
4910 | SET_CLASSTYPE_INTERFACE_UNKNOWN (type); |
4911 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) = 1; | |
8d08fdba MS |
4912 | } |
4913 | ||
f7da6097 MS |
4914 | TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern); |
4915 | TYPE_HAS_DESTRUCTOR (type) = TYPE_HAS_DESTRUCTOR (pattern); | |
f7da6097 MS |
4916 | TYPE_OVERLOADS_CALL_EXPR (type) = TYPE_OVERLOADS_CALL_EXPR (pattern); |
4917 | TYPE_OVERLOADS_ARRAY_REF (type) = TYPE_OVERLOADS_ARRAY_REF (pattern); | |
4918 | TYPE_OVERLOADS_ARROW (type) = TYPE_OVERLOADS_ARROW (pattern); | |
834c6dff MM |
4919 | TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern); |
4920 | TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern); | |
f7da6097 MS |
4921 | TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern); |
4922 | TYPE_VEC_DELETE_TAKES_SIZE (type) = TYPE_VEC_DELETE_TAKES_SIZE (pattern); | |
4923 | TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern); | |
4924 | TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern); | |
4925 | TYPE_HAS_ABSTRACT_ASSIGN_REF (type) = TYPE_HAS_ABSTRACT_ASSIGN_REF (pattern); | |
4926 | TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern); | |
4927 | TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern); | |
f7da6097 MS |
4928 | TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern); |
4929 | TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern); | |
4c6b7393 MM |
4930 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (type) |
4931 | = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (pattern); | |
f7da6097 MS |
4932 | TYPE_USES_MULTIPLE_INHERITANCE (type) |
4933 | = TYPE_USES_MULTIPLE_INHERITANCE (pattern); | |
4934 | TYPE_USES_VIRTUAL_BASECLASSES (type) | |
4935 | = TYPE_USES_VIRTUAL_BASECLASSES (pattern); | |
4936 | TYPE_PACKED (type) = TYPE_PACKED (pattern); | |
4937 | TYPE_ALIGN (type) = TYPE_ALIGN (pattern); | |
11cf4d18 | 4938 | TYPE_USER_ALIGN (type) = TYPE_USER_ALIGN (pattern); |
eff71ab0 | 4939 | TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */ |
6bdb8141 JM |
4940 | if (ANON_AGGR_TYPE_P (pattern)) |
4941 | SET_ANON_AGGR_TYPE_P (type); | |
f7da6097 | 4942 | |
3fd71a52 MM |
4943 | if (TYPE_BINFO_BASETYPES (pattern)) |
4944 | { | |
4945 | tree base_list = NULL_TREE; | |
4946 | tree pbases = TYPE_BINFO_BASETYPES (pattern); | |
4947 | int i; | |
5566b478 | 4948 | |
3fd71a52 MM |
4949 | /* Substitute into each of the bases to determine the actual |
4950 | basetypes. */ | |
4951 | for (i = 0; i < TREE_VEC_LENGTH (pbases); ++i) | |
4952 | { | |
4953 | tree base; | |
4954 | tree access; | |
4955 | tree pbase; | |
5566b478 | 4956 | |
3fd71a52 | 4957 | pbase = TREE_VEC_ELT (pbases, i); |
711734a9 | 4958 | |
dc957d14 | 4959 | /* Substitute to figure out the base class. */ |
3fd71a52 MM |
4960 | base = tsubst (BINFO_TYPE (pbase), args, |
4961 | /*complain=*/1, NULL_TREE); | |
4962 | if (base == error_mark_node) | |
4963 | continue; | |
711734a9 | 4964 | |
3fd71a52 MM |
4965 | /* Calculate the correct access node. */ |
4966 | if (TREE_VIA_VIRTUAL (pbase)) | |
4967 | { | |
4968 | if (TREE_VIA_PUBLIC (pbase)) | |
4969 | access = access_public_virtual_node; | |
4970 | else if (TREE_VIA_PROTECTED (pbase)) | |
4971 | access = access_protected_virtual_node; | |
d6479fe7 | 4972 | else |
3fd71a52 MM |
4973 | access = access_private_virtual_node; |
4974 | } | |
4975 | else | |
4976 | { | |
4977 | if (TREE_VIA_PUBLIC (pbase)) | |
4978 | access = access_public_node; | |
4979 | else if (TREE_VIA_PROTECTED (pbase)) | |
4980 | access = access_protected_node; | |
d6479fe7 | 4981 | else |
3fd71a52 MM |
4982 | access = access_private_node; |
4983 | } | |
dfbcd65a | 4984 | |
3fd71a52 MM |
4985 | base_list = tree_cons (access, base, base_list); |
4986 | } | |
dfbcd65a | 4987 | |
3fd71a52 MM |
4988 | /* The list is now in reverse order; correct that. */ |
4989 | base_list = nreverse (base_list); | |
4990 | ||
4991 | /* Now call xref_basetypes to set up all the base-class | |
4992 | information. */ | |
4993 | xref_basetypes (TREE_CODE (pattern) == RECORD_TYPE | |
4994 | ? (CLASSTYPE_DECLARED_CLASS (pattern) | |
4995 | ? class_type_node : record_type_node) | |
4996 | : union_type_node, | |
4997 | DECL_NAME (TYPE_NAME (pattern)), | |
4998 | type, | |
4999 | base_list); | |
5000 | } | |
5566b478 | 5001 | |
b74a0560 MM |
5002 | /* Now that our base classes are set up, enter the scope of the |
5003 | class, so that name lookups into base classes, etc. will work | |
dc957d14 | 5004 | correctly. This is precisely analogous to what we do in |
b74a0560 MM |
5005 | begin_class_definition when defining an ordinary non-template |
5006 | class. */ | |
5007 | pushclass (type, 1); | |
5008 | ||
5566b478 | 5009 | for (t = CLASSTYPE_TAGS (pattern); t; t = TREE_CHAIN (t)) |
8d08fdba | 5010 | { |
5566b478 | 5011 | tree tag = TREE_VALUE (t); |
36a117a5 MM |
5012 | tree name = TYPE_IDENTIFIER (tag); |
5013 | tree newtag; | |
5566b478 | 5014 | |
4393e105 | 5015 | newtag = tsubst (tag, args, /*complain=*/1, NULL_TREE); |
61a127b3 | 5016 | if (TREE_CODE (newtag) != ENUMERAL_TYPE) |
ed44da02 | 5017 | { |
486e4077 MM |
5018 | if (TYPE_LANG_SPECIFIC (tag) && CLASSTYPE_IS_TEMPLATE (tag)) |
5019 | /* Unfortunately, lookup_template_class sets | |
5020 | CLASSTYPE_IMPLICIT_INSTANTIATION for a partial | |
5021 | instantiation (i.e., for the type of a member template | |
5022 | class nested within a template class.) This behavior is | |
5023 | required for maybe_process_partial_specialization to work | |
5024 | correctly, but is not accurate in this case; the TAG is not | |
5025 | an instantiation of anything. (The corresponding | |
5026 | TEMPLATE_DECL is an instantiation, but the TYPE is not.) */ | |
5027 | CLASSTYPE_USE_TEMPLATE (newtag) = 0; | |
5028 | ||
ed44da02 MM |
5029 | /* Now, we call pushtag to put this NEWTAG into the scope of |
5030 | TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid | |
5031 | pushtag calling push_template_decl. We don't have to do | |
5032 | this for enums because it will already have been done in | |
5033 | tsubst_enum. */ | |
5034 | if (name) | |
5035 | SET_IDENTIFIER_TYPE_VALUE (name, newtag); | |
5036 | pushtag (name, newtag, /*globalize=*/0); | |
5037 | } | |
8d08fdba MS |
5038 | } |
5039 | ||
5566b478 MS |
5040 | /* Don't replace enum constants here. */ |
5041 | for (t = TYPE_FIELDS (pattern); t; t = TREE_CHAIN (t)) | |
8dd3f57a | 5042 | if (TREE_CODE (t) != CONST_DECL) |
5566b478 | 5043 | { |
ae58fa02 MM |
5044 | tree r; |
5045 | ||
5046 | /* The the file and line for this declaration, to assist in | |
5047 | error message reporting. Since we called push_tinst_level | |
5048 | above, we don't need to restore these. */ | |
5049 | lineno = DECL_SOURCE_LINE (t); | |
5050 | input_filename = DECL_SOURCE_FILE (t); | |
5051 | ||
4393e105 | 5052 | r = tsubst (t, args, /*complain=*/1, NULL_TREE); |
5566b478 MS |
5053 | if (TREE_CODE (r) == VAR_DECL) |
5054 | { | |
fa8d6e85 MM |
5055 | tree init; |
5056 | ||
94c82a77 | 5057 | if (DECL_DEFINED_IN_CLASS_P (r)) |
fa8d6e85 MM |
5058 | init = tsubst_expr (DECL_INITIAL (t), args, |
5059 | /*complain=*/1, NULL_TREE); | |
5060 | else | |
5061 | init = NULL_TREE; | |
5062 | ||
5063 | finish_static_data_member_decl (r, init, | |
5064 | /*asmspec_tree=*/NULL_TREE, | |
fa8d6e85 MM |
5065 | /*flags=*/0); |
5066 | ||
6ba89f8e MM |
5067 | if (DECL_DEFINED_IN_CLASS_P (r)) |
5068 | check_static_variable_definition (r, TREE_TYPE (r)); | |
5566b478 | 5069 | } |
61a127b3 MM |
5070 | |
5071 | /* R will have a TREE_CHAIN if and only if it has already been | |
5072 | processed by finish_member_declaration. This can happen | |
5073 | if, for example, it is a TYPE_DECL for a class-scoped | |
5074 | ENUMERAL_TYPE; such a thing will already have been added to | |
5075 | the field list by tsubst_enum above. */ | |
5076 | if (!TREE_CHAIN (r)) | |
5077 | { | |
5078 | set_current_access_from_decl (r); | |
5079 | finish_member_declaration (r); | |
5080 | } | |
5566b478 | 5081 | } |
8d08fdba | 5082 | |
61a127b3 MM |
5083 | /* Set up the list (TYPE_METHODS) and vector (CLASSTYPE_METHOD_VEC) |
5084 | for this instantiation. */ | |
5085 | for (t = TYPE_METHODS (pattern); t; t = TREE_CHAIN (t)) | |
5086 | { | |
4393e105 | 5087 | tree r = tsubst (t, args, /*complain=*/1, NULL_TREE); |
61a127b3 MM |
5088 | set_current_access_from_decl (r); |
5089 | finish_member_declaration (r); | |
5090 | } | |
8d08fdba | 5091 | |
2604412d JM |
5092 | /* Construct the DECL_FRIENDLIST for the new class type. */ |
5093 | typedecl = TYPE_MAIN_DECL (type); | |
5094 | for (t = DECL_FRIENDLIST (TYPE_MAIN_DECL (pattern)); | |
5095 | t != NULL_TREE; | |
5096 | t = TREE_CHAIN (t)) | |
f84b4be9 | 5097 | { |
2604412d | 5098 | tree friends; |
f84b4be9 | 5099 | |
2604412d JM |
5100 | for (friends = TREE_VALUE (t); |
5101 | friends != NULL_TREE; | |
5102 | friends = TREE_CHAIN (friends)) | |
0c0aac2f MM |
5103 | if (TREE_PURPOSE (friends) == error_mark_node) |
5104 | add_friend (type, | |
5105 | tsubst_friend_function (TREE_VALUE (friends), | |
5106 | args)); | |
5107 | else | |
4f1c5b7d | 5108 | my_friendly_abort (20000216); |
2604412d | 5109 | } |
5566b478 | 5110 | |
6757edfe MM |
5111 | for (t = CLASSTYPE_FRIEND_CLASSES (pattern); |
5112 | t != NULL_TREE; | |
5113 | t = TREE_CHAIN (t)) | |
5114 | { | |
5115 | tree friend_type = TREE_VALUE (t); | |
1aed5355 | 5116 | tree new_friend_type; |
6757edfe | 5117 | |
36a117a5 MM |
5118 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
5119 | new_friend_type = tsubst_friend_class (friend_type, args); | |
5120 | else if (uses_template_parms (friend_type)) | |
4393e105 MM |
5121 | new_friend_type = tsubst (friend_type, args, /*complain=*/1, |
5122 | NULL_TREE); | |
36a117a5 | 5123 | else |
61fc8c9e MM |
5124 | { |
5125 | tree ns = decl_namespace_context (TYPE_MAIN_DECL (friend_type)); | |
36a117a5 | 5126 | |
61fc8c9e MM |
5127 | /* The call to xref_tag_from_type does injection for friend |
5128 | classes. */ | |
5129 | push_nested_namespace (ns); | |
5130 | new_friend_type = | |
5131 | xref_tag_from_type (friend_type, NULL_TREE, 1); | |
5132 | pop_nested_namespace (ns); | |
5133 | } | |
1aed5355 MM |
5134 | |
5135 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) | |
5136 | /* Trick make_friend_class into realizing that the friend | |
5137 | we're adding is a template, not an ordinary class. It's | |
5138 | important that we use make_friend_class since it will | |
5139 | perform some error-checking and output cross-reference | |
5140 | information. */ | |
5141 | ++processing_template_decl; | |
5142 | ||
4b054b80 NS |
5143 | if (new_friend_type != error_mark_node) |
5144 | make_friend_class (type, new_friend_type); | |
fc378698 | 5145 | |
1aed5355 MM |
5146 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
5147 | --processing_template_decl; | |
6757edfe | 5148 | } |
fc378698 | 5149 | |
2604412d JM |
5150 | for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t)) |
5151 | if (TREE_CODE (t) == FIELD_DECL) | |
5152 | { | |
5153 | TREE_TYPE (t) = complete_type (TREE_TYPE (t)); | |
5154 | require_complete_type (t); | |
5155 | } | |
5566b478 | 5156 | |
61a127b3 MM |
5157 | /* Set the file and line number information to whatever is given for |
5158 | the class itself. This puts error messages involving generated | |
5159 | implicit functions at a predictable point, and the same point | |
5160 | that would be used for non-template classes. */ | |
5161 | lineno = DECL_SOURCE_LINE (typedecl); | |
5162 | input_filename = DECL_SOURCE_FILE (typedecl); | |
5163 | ||
5164 | unreverse_member_declarations (type); | |
9f33663b | 5165 | finish_struct_1 (type); |
2604412d | 5166 | CLASSTYPE_GOT_SEMICOLON (type) = 1; |
e92cc029 | 5167 | |
5524676d JM |
5168 | /* Clear this now so repo_template_used is happy. */ |
5169 | TYPE_BEING_DEFINED (type) = 0; | |
2604412d | 5170 | repo_template_used (type); |
8d08fdba | 5171 | |
9188c363 MM |
5172 | /* Now that the class is complete, instantiate default arguments for |
5173 | any member functions. We don't do this earlier because the | |
5174 | default arguments may reference members of the class. */ | |
5175 | if (!PRIMARY_TEMPLATE_P (template)) | |
5176 | for (t = TYPE_METHODS (type); t; t = TREE_CHAIN (t)) | |
5177 | if (TREE_CODE (t) == FUNCTION_DECL | |
dc957d14 | 5178 | /* Implicitly generated member functions will not have template |
9188c363 MM |
5179 | information; they are not instantiations, but instead are |
5180 | created "fresh" for each instantiation. */ | |
5181 | && DECL_TEMPLATE_INFO (t)) | |
5182 | tsubst_default_arguments (t); | |
5183 | ||
b74a0560 | 5184 | popclass (); |
5566b478 MS |
5185 | pop_from_top_level (); |
5186 | pop_tinst_level (); | |
5187 | ||
5188 | return type; | |
8d08fdba MS |
5189 | } |
5190 | ||
5191 | static int | |
5192 | list_eq (t1, t2) | |
5193 | tree t1, t2; | |
5194 | { | |
5195 | if (t1 == NULL_TREE) | |
5196 | return t2 == NULL_TREE; | |
5197 | if (t2 == NULL_TREE) | |
5198 | return 0; | |
5199 | /* Don't care if one declares its arg const and the other doesn't -- the | |
5200 | main variant of the arg type is all that matters. */ | |
5201 | if (TYPE_MAIN_VARIANT (TREE_VALUE (t1)) | |
5202 | != TYPE_MAIN_VARIANT (TREE_VALUE (t2))) | |
5203 | return 0; | |
5204 | return list_eq (TREE_CHAIN (t1), TREE_CHAIN (t2)); | |
5205 | } | |
5206 | ||
00d3396f JM |
5207 | /* If arg is a non-type template parameter that does not depend on template |
5208 | arguments, fold it like we weren't in the body of a template. */ | |
5209 | ||
5210 | static tree | |
5211 | maybe_fold_nontype_arg (arg) | |
5212 | tree arg; | |
5213 | { | |
7610f2ce JM |
5214 | /* If we're not in a template, ARG is already as simple as it's going to |
5215 | get, and trying to reprocess the trees will break. */ | |
5216 | if (! processing_template_decl) | |
5217 | return arg; | |
5218 | ||
2f939d94 | 5219 | if (!TYPE_P (arg) && !uses_template_parms (arg)) |
00d3396f JM |
5220 | { |
5221 | /* Sometimes, one of the args was an expression involving a | |
5222 | template constant parameter, like N - 1. Now that we've | |
5223 | tsubst'd, we might have something like 2 - 1. This will | |
5224 | confuse lookup_template_class, so we do constant folding | |
5225 | here. We have to unset processing_template_decl, to | |
5226 | fool build_expr_from_tree() into building an actual | |
5227 | tree. */ | |
5228 | ||
5229 | int saved_processing_template_decl = processing_template_decl; | |
5230 | processing_template_decl = 0; | |
5231 | arg = fold (build_expr_from_tree (arg)); | |
5232 | processing_template_decl = saved_processing_template_decl; | |
5233 | } | |
5234 | return arg; | |
5235 | } | |
5236 | ||
830bfa74 MM |
5237 | /* Substitute ARGS into the vector of template arguments T. */ |
5238 | ||
e9659ab0 | 5239 | static tree |
4393e105 | 5240 | tsubst_template_arg_vector (t, args, complain) |
830bfa74 MM |
5241 | tree t; |
5242 | tree args; | |
4393e105 | 5243 | int complain; |
830bfa74 MM |
5244 | { |
5245 | int len = TREE_VEC_LENGTH (t), need_new = 0, i; | |
5246 | tree *elts = (tree *) alloca (len * sizeof (tree)); | |
5247 | ||
961192e1 | 5248 | memset ((char *) elts, 0, len * sizeof (tree)); |
830bfa74 MM |
5249 | |
5250 | for (i = 0; i < len; i++) | |
5251 | { | |
5252 | if (TREE_VEC_ELT (t, i) != NULL_TREE | |
5253 | && TREE_CODE (TREE_VEC_ELT (t, i)) == TREE_VEC) | |
4393e105 MM |
5254 | elts[i] = tsubst_template_arg_vector (TREE_VEC_ELT (t, i), |
5255 | args, complain); | |
830bfa74 MM |
5256 | else |
5257 | elts[i] = maybe_fold_nontype_arg | |
4393e105 MM |
5258 | (tsubst_expr (TREE_VEC_ELT (t, i), args, complain, |
5259 | NULL_TREE)); | |
830bfa74 | 5260 | |
08e72a19 JM |
5261 | if (elts[i] == error_mark_node) |
5262 | return error_mark_node; | |
5263 | ||
830bfa74 MM |
5264 | if (elts[i] != TREE_VEC_ELT (t, i)) |
5265 | need_new = 1; | |
5266 | } | |
5267 | ||
5268 | if (!need_new) | |
5269 | return t; | |
5270 | ||
f31c0a32 | 5271 | t = make_tree_vec (len); |
830bfa74 MM |
5272 | for (i = 0; i < len; i++) |
5273 | TREE_VEC_ELT (t, i) = elts[i]; | |
5274 | ||
5275 | return t; | |
5276 | } | |
5277 | ||
36a117a5 MM |
5278 | /* Return the result of substituting ARGS into the template parameters |
5279 | given by PARMS. If there are m levels of ARGS and m + n levels of | |
5280 | PARMS, then the result will contain n levels of PARMS. For | |
5281 | example, if PARMS is `template <class T> template <class U> | |
5282 | template <T*, U, class V>' and ARGS is {{int}, {double}} then the | |
5283 | result will be `template <int*, double, class V>'. */ | |
5284 | ||
e9659ab0 | 5285 | static tree |
4393e105 | 5286 | tsubst_template_parms (parms, args, complain) |
36a117a5 MM |
5287 | tree parms; |
5288 | tree args; | |
4393e105 | 5289 | int complain; |
36a117a5 | 5290 | { |
f71f87f9 MM |
5291 | tree r = NULL_TREE; |
5292 | tree* new_parms; | |
36a117a5 MM |
5293 | |
5294 | for (new_parms = &r; | |
5295 | TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args); | |
5296 | new_parms = &(TREE_CHAIN (*new_parms)), | |
5297 | parms = TREE_CHAIN (parms)) | |
5298 | { | |
5299 | tree new_vec = | |
5300 | make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms))); | |
5301 | int i; | |
5302 | ||
5303 | for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i) | |
5304 | { | |
5305 | tree default_value = | |
5306 | TREE_PURPOSE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
5307 | tree parm_decl = | |
5308 | TREE_VALUE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
5309 | ||
5310 | TREE_VEC_ELT (new_vec, i) | |
4393e105 MM |
5311 | = build_tree_list (tsubst (default_value, args, complain, |
5312 | NULL_TREE), | |
5313 | tsubst (parm_decl, args, complain, | |
5314 | NULL_TREE)); | |
36a117a5 MM |
5315 | } |
5316 | ||
5317 | *new_parms = | |
5318 | tree_cons (build_int_2 (0, (TMPL_PARMS_DEPTH (parms) | |
5319 | - TMPL_ARGS_DEPTH (args))), | |
5320 | new_vec, NULL_TREE); | |
5321 | } | |
5322 | ||
5323 | return r; | |
5324 | } | |
5325 | ||
ed44da02 MM |
5326 | /* Substitute the ARGS into the indicated aggregate (or enumeration) |
5327 | type T. If T is not an aggregate or enumeration type, it is | |
5328 | handled as if by tsubst. IN_DECL is as for tsubst. If | |
5329 | ENTERING_SCOPE is non-zero, T is the context for a template which | |
dc957d14 | 5330 | we are presently tsubst'ing. Return the substituted value. */ |
36a117a5 | 5331 | |
e9659ab0 | 5332 | static tree |
4393e105 | 5333 | tsubst_aggr_type (t, args, complain, in_decl, entering_scope) |
36a117a5 MM |
5334 | tree t; |
5335 | tree args; | |
4393e105 | 5336 | int complain; |
36a117a5 MM |
5337 | tree in_decl; |
5338 | int entering_scope; | |
5339 | { | |
5340 | if (t == NULL_TREE) | |
5341 | return NULL_TREE; | |
5342 | ||
5343 | switch (TREE_CODE (t)) | |
5344 | { | |
5345 | case RECORD_TYPE: | |
5346 | if (TYPE_PTRMEMFUNC_P (t)) | |
5347 | { | |
5348 | tree r = build_ptrmemfunc_type | |
4393e105 | 5349 | (tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl)); |
adecb3f4 MM |
5350 | return cp_build_qualified_type_real (r, TYPE_QUALS (t), |
5351 | complain); | |
36a117a5 MM |
5352 | } |
5353 | ||
5354 | /* else fall through */ | |
ed44da02 | 5355 | case ENUMERAL_TYPE: |
36a117a5 | 5356 | case UNION_TYPE: |
5db698f6 | 5357 | if (TYPE_TEMPLATE_INFO (t)) |
36a117a5 MM |
5358 | { |
5359 | tree argvec; | |
5360 | tree context; | |
5361 | tree r; | |
5362 | ||
5363 | /* First, determine the context for the type we are looking | |
5364 | up. */ | |
5365 | if (TYPE_CONTEXT (t) != NULL_TREE) | |
5366 | context = tsubst_aggr_type (TYPE_CONTEXT (t), args, | |
4393e105 | 5367 | complain, |
36a117a5 MM |
5368 | in_decl, /*entering_scope=*/1); |
5369 | else | |
5370 | context = NULL_TREE; | |
5371 | ||
5372 | /* Then, figure out what arguments are appropriate for the | |
5373 | type we are trying to find. For example, given: | |
5374 | ||
5375 | template <class T> struct S; | |
5376 | template <class T, class U> void f(T, U) { S<U> su; } | |
5377 | ||
5378 | and supposing that we are instantiating f<int, double>, | |
5379 | then our ARGS will be {int, double}, but, when looking up | |
5380 | S we only want {double}. */ | |
4393e105 MM |
5381 | argvec = tsubst_template_arg_vector (TYPE_TI_ARGS (t), args, |
5382 | complain); | |
08e72a19 JM |
5383 | if (argvec == error_mark_node) |
5384 | return error_mark_node; | |
36a117a5 MM |
5385 | |
5386 | r = lookup_template_class (t, argvec, in_decl, context, | |
5387 | entering_scope); | |
5388 | ||
adecb3f4 MM |
5389 | return cp_build_qualified_type_real (r, TYPE_QUALS (t), |
5390 | complain); | |
36a117a5 MM |
5391 | } |
5392 | else | |
5393 | /* This is not a template type, so there's nothing to do. */ | |
5394 | return t; | |
5395 | ||
5396 | default: | |
4393e105 | 5397 | return tsubst (t, args, complain, in_decl); |
36a117a5 MM |
5398 | } |
5399 | } | |
5400 | ||
9188c363 MM |
5401 | /* Substitute into the default argument ARG (a default argument for |
5402 | FN), which has the indicated TYPE. */ | |
5403 | ||
5404 | tree | |
5405 | tsubst_default_argument (fn, type, arg) | |
5406 | tree fn; | |
5407 | tree type; | |
5408 | tree arg; | |
5409 | { | |
5410 | /* This default argument came from a template. Instantiate the | |
5411 | default argument here, not in tsubst. In the case of | |
5412 | something like: | |
5413 | ||
5414 | template <class T> | |
5415 | struct S { | |
5416 | static T t(); | |
5417 | void f(T = t()); | |
5418 | }; | |
5419 | ||
5420 | we must be careful to do name lookup in the scope of S<T>, | |
5421 | rather than in the current class. */ | |
5422 | if (DECL_CLASS_SCOPE_P (fn)) | |
4f1c5b7d | 5423 | pushclass (DECL_CONTEXT (fn), 2); |
9188c363 MM |
5424 | |
5425 | arg = tsubst_expr (arg, DECL_TI_ARGS (fn), /*complain=*/1, NULL_TREE); | |
5426 | ||
5427 | if (DECL_CLASS_SCOPE_P (fn)) | |
5428 | popclass (); | |
5429 | ||
5430 | /* Make sure the default argument is reasonable. */ | |
5431 | arg = check_default_argument (type, arg); | |
5432 | ||
5433 | return arg; | |
5434 | } | |
5435 | ||
5436 | /* Substitute into all the default arguments for FN. */ | |
5437 | ||
5438 | static void | |
5439 | tsubst_default_arguments (fn) | |
5440 | tree fn; | |
5441 | { | |
5442 | tree arg; | |
5443 | tree tmpl_args; | |
5444 | ||
5445 | tmpl_args = DECL_TI_ARGS (fn); | |
5446 | ||
5447 | /* If this function is not yet instantiated, we certainly don't need | |
5448 | its default arguments. */ | |
5449 | if (uses_template_parms (tmpl_args)) | |
5450 | return; | |
5451 | ||
5452 | for (arg = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
5453 | arg; | |
5454 | arg = TREE_CHAIN (arg)) | |
5455 | if (TREE_PURPOSE (arg)) | |
5456 | TREE_PURPOSE (arg) = tsubst_default_argument (fn, | |
5457 | TREE_VALUE (arg), | |
5458 | TREE_PURPOSE (arg)); | |
5459 | } | |
5460 | ||
ae58fa02 MM |
5461 | /* Substitute the ARGS into the T, which is a _DECL. TYPE is the |
5462 | (already computed) substitution of ARGS into TREE_TYPE (T), if | |
5463 | appropriate. Return the result of the substitution. IN_DECL is as | |
5464 | for tsubst. */ | |
00d3396f | 5465 | |
e9659ab0 | 5466 | static tree |
ae58fa02 MM |
5467 | tsubst_decl (t, args, type, in_decl) |
5468 | tree t; | |
5469 | tree args; | |
5470 | tree type; | |
8d08fdba MS |
5471 | tree in_decl; |
5472 | { | |
ae58fa02 | 5473 | int saved_lineno; |
3b304f5b | 5474 | const char *saved_filename; |
b370501f | 5475 | tree r = NULL_TREE; |
830bfa74 | 5476 | |
ae58fa02 MM |
5477 | /* Set the filename and linenumber to improve error-reporting. */ |
5478 | saved_lineno = lineno; | |
5479 | saved_filename = input_filename; | |
5480 | lineno = DECL_SOURCE_LINE (t); | |
5481 | input_filename = DECL_SOURCE_FILE (t); | |
b7484fbe | 5482 | |
8d08fdba MS |
5483 | switch (TREE_CODE (t)) |
5484 | { | |
98c1c668 JM |
5485 | case TEMPLATE_DECL: |
5486 | { | |
5487 | /* We can get here when processing a member template function | |
5488 | of a template class. */ | |
98c1c668 | 5489 | tree decl = DECL_TEMPLATE_RESULT (t); |
386b8a85 | 5490 | tree spec; |
db2767b6 | 5491 | int is_template_template_parm = DECL_TEMPLATE_TEMPLATE_PARM_P (t); |
98c1c668 | 5492 | |
db2767b6 MM |
5493 | if (!is_template_template_parm) |
5494 | { | |
36a117a5 MM |
5495 | /* We might already have an instance of this template. |
5496 | The ARGS are for the surrounding class type, so the | |
5497 | full args contain the tsubst'd args for the context, | |
5498 | plus the innermost args from the template decl. */ | |
5499 | tree tmpl_args = DECL_CLASS_TEMPLATE_P (t) | |
5500 | ? CLASSTYPE_TI_ARGS (TREE_TYPE (t)) | |
17aec3eb | 5501 | : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t)); |
7ddedda4 MM |
5502 | tree full_args; |
5503 | ||
4393e105 MM |
5504 | full_args = tsubst_template_arg_vector (tmpl_args, args, |
5505 | /*complain=*/1); | |
36a117a5 MM |
5506 | |
5507 | /* tsubst_template_arg_vector doesn't copy the vector if | |
5508 | nothing changed. But, *something* should have | |
5509 | changed. */ | |
5510 | my_friendly_assert (full_args != tmpl_args, 0); | |
5511 | ||
5512 | spec = retrieve_specialization (t, full_args); | |
db2767b6 | 5513 | if (spec != NULL_TREE) |
ae58fa02 MM |
5514 | { |
5515 | r = spec; | |
5516 | break; | |
5517 | } | |
db2767b6 | 5518 | } |
98c1c668 JM |
5519 | |
5520 | /* Make a new template decl. It will be similar to the | |
5521 | original, but will record the current template arguments. | |
5522 | We also create a new function declaration, which is just | |
5523 | like the old one, but points to this new template, rather | |
5524 | than the old one. */ | |
0acf7199 | 5525 | r = copy_decl (t); |
ae58fa02 MM |
5526 | my_friendly_assert (DECL_LANG_SPECIFIC (r) != 0, 0); |
5527 | TREE_CHAIN (r) = NULL_TREE; | |
db2767b6 MM |
5528 | |
5529 | if (is_template_template_parm) | |
5530 | { | |
4393e105 | 5531 | tree new_decl = tsubst (decl, args, /*complain=*/1, in_decl); |
17aec3eb | 5532 | DECL_TEMPLATE_RESULT (r) = new_decl; |
ae58fa02 MM |
5533 | TREE_TYPE (r) = TREE_TYPE (new_decl); |
5534 | break; | |
db2767b6 MM |
5535 | } |
5536 | ||
ae58fa02 | 5537 | DECL_CONTEXT (r) |
4f1c5b7d | 5538 | = tsubst_aggr_type (DECL_CONTEXT (t), args, |
4393e105 MM |
5539 | /*complain=*/1, in_decl, |
5540 | /*entering_scope=*/1); | |
4f1c5b7d MM |
5541 | DECL_VIRTUAL_CONTEXT (r) |
5542 | = tsubst_aggr_type (DECL_VIRTUAL_CONTEXT (t), args, | |
5543 | /*complain=*/1, in_decl, | |
5544 | /*entering_scope=*/1); | |
ae58fa02 | 5545 | DECL_TEMPLATE_INFO (r) = build_tree_list (t, args); |
93cdc044 JM |
5546 | |
5547 | if (TREE_CODE (decl) == TYPE_DECL) | |
5548 | { | |
4393e105 MM |
5549 | tree new_type = tsubst (TREE_TYPE (t), args, |
5550 | /*complain=*/1, in_decl); | |
ae58fa02 MM |
5551 | TREE_TYPE (r) = new_type; |
5552 | CLASSTYPE_TI_TEMPLATE (new_type) = r; | |
17aec3eb | 5553 | DECL_TEMPLATE_RESULT (r) = TYPE_MAIN_DECL (new_type); |
ae58fa02 | 5554 | DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type); |
93cdc044 JM |
5555 | } |
5556 | else | |
5557 | { | |
4393e105 | 5558 | tree new_decl = tsubst (decl, args, /*complain=*/1, in_decl); |
17aec3eb RK |
5559 | |
5560 | DECL_TEMPLATE_RESULT (r) = new_decl; | |
ae58fa02 MM |
5561 | DECL_TI_TEMPLATE (new_decl) = r; |
5562 | TREE_TYPE (r) = TREE_TYPE (new_decl); | |
5563 | DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl); | |
93cdc044 JM |
5564 | } |
5565 | ||
ae58fa02 MM |
5566 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
5567 | DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE; | |
5568 | DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE; | |
98c1c668 JM |
5569 | |
5570 | /* The template parameters for this new template are all the | |
5571 | template parameters for the old template, except the | |
5572 | outermost level of parameters. */ | |
ae58fa02 | 5573 | DECL_TEMPLATE_PARMS (r) |
4393e105 MM |
5574 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args, |
5575 | /*complain=*/1); | |
98c1c668 | 5576 | |
93cdc044 | 5577 | if (PRIMARY_TEMPLATE_P (t)) |
ae58fa02 | 5578 | DECL_PRIMARY_TEMPLATE (r) = r; |
93cdc044 | 5579 | |
8d019cef | 5580 | /* We don't partially instantiate partial specializations. */ |
93cdc044 | 5581 | if (TREE_CODE (decl) == TYPE_DECL) |
ae58fa02 | 5582 | break; |
93cdc044 | 5583 | |
75650646 | 5584 | /* Record this partial instantiation. */ |
ae58fa02 | 5585 | register_specialization (r, t, |
17aec3eb | 5586 | DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r))); |
75650646 | 5587 | |
98c1c668 | 5588 | } |
ae58fa02 | 5589 | break; |
8d08fdba MS |
5590 | |
5591 | case FUNCTION_DECL: | |
5592 | { | |
386b8a85 | 5593 | tree ctx; |
87603ed0 | 5594 | tree argvec = NULL_TREE; |
cf38f48a | 5595 | tree *friends; |
36a117a5 | 5596 | tree gen_tmpl; |
5566b478 | 5597 | int member; |
d8c4447d MM |
5598 | int args_depth; |
5599 | int parms_depth; | |
5566b478 | 5600 | |
36a117a5 MM |
5601 | /* Nobody should be tsubst'ing into non-template functions. */ |
5602 | my_friendly_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE, 0); | |
5603 | ||
5604 | if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL) | |
5605 | { | |
5606 | tree spec; | |
5607 | ||
5608 | /* Calculate the most general template of which R is a | |
5609 | specialization, and the complete set of arguments used to | |
5610 | specialize R. */ | |
5611 | gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t)); | |
7ddedda4 MM |
5612 | argvec |
5613 | = tsubst_template_arg_vector (DECL_TI_ARGS | |
5614 | (DECL_TEMPLATE_RESULT (gen_tmpl)), | |
4393e105 | 5615 | args, /*complain=*/1); |
36a117a5 MM |
5616 | |
5617 | /* Check to see if we already have this specialization. */ | |
5618 | spec = retrieve_specialization (gen_tmpl, argvec); | |
7ddedda4 | 5619 | |
36a117a5 | 5620 | if (spec) |
ae58fa02 MM |
5621 | { |
5622 | r = spec; | |
5623 | break; | |
5624 | } | |
d8c4447d | 5625 | |
f9a7ae04 MM |
5626 | /* We can see more levels of arguments than parameters if |
5627 | there was a specialization of a member template, like | |
5628 | this: | |
5629 | ||
5630 | template <class T> struct S { template <class U> void f(); } | |
5631 | template <> template <class U> void S<int>::f(U); | |
5632 | ||
dc957d14 | 5633 | Here, we'll be substituting into the specialization, |
f9a7ae04 MM |
5634 | because that's where we can find the code we actually |
5635 | want to generate, but we'll have enough arguments for | |
5636 | the most general template. | |
5637 | ||
5638 | We also deal with the peculiar case: | |
d8c4447d MM |
5639 | |
5640 | template <class T> struct S { | |
5641 | template <class U> friend void f(); | |
5642 | }; | |
74b846e0 | 5643 | template <class U> void f() {} |
d8c4447d MM |
5644 | template S<int>; |
5645 | template void f<double>(); | |
5646 | ||
5647 | Here, the ARGS for the instantiation of will be {int, | |
5648 | double}. But, we only need as many ARGS as there are | |
5649 | levels of template parameters in CODE_PATTERN. We are | |
5650 | careful not to get fooled into reducing the ARGS in | |
5651 | situations like: | |
5652 | ||
5653 | template <class T> struct S { template <class U> void f(U); } | |
5654 | template <class T> template <> void S<T>::f(int) {} | |
5655 | ||
5656 | which we can spot because the pattern will be a | |
5657 | specialization in this case. */ | |
5658 | args_depth = TMPL_ARGS_DEPTH (args); | |
5659 | parms_depth = | |
5660 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t))); | |
5661 | if (args_depth > parms_depth | |
5662 | && !DECL_TEMPLATE_SPECIALIZATION (t)) | |
f9a7ae04 | 5663 | args = get_innermost_template_args (args, parms_depth); |
36a117a5 MM |
5664 | } |
5665 | else | |
5666 | { | |
5667 | /* This special case arises when we have something like this: | |
5668 | ||
5669 | template <class T> struct S { | |
5670 | friend void f<int>(int, double); | |
5671 | }; | |
5672 | ||
5673 | Here, the DECL_TI_TEMPLATE for the friend declaration | |
39c01e4c MM |
5674 | will be a LOOKUP_EXPR or an IDENTIFIER_NODE. We are |
5675 | being called from tsubst_friend_function, and we want | |
5676 | only to create a new decl (R) with appropriate types so | |
5677 | that we can call determine_specialization. */ | |
5678 | my_friendly_assert ((TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5679 | == LOOKUP_EXPR) | |
5680 | || (TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5681 | == IDENTIFIER_NODE), 0); | |
36a117a5 MM |
5682 | gen_tmpl = NULL_TREE; |
5683 | } | |
5684 | ||
6eb3bb27 | 5685 | if (DECL_CLASS_SCOPE_P (t)) |
8d08fdba | 5686 | { |
5566b478 MS |
5687 | if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t))) |
5688 | member = 2; | |
5689 | else | |
5690 | member = 1; | |
4f1c5b7d | 5691 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
4393e105 | 5692 | /*complain=*/1, t, |
36a117a5 | 5693 | /*entering_scope=*/1); |
5566b478 MS |
5694 | } |
5695 | else | |
5696 | { | |
5697 | member = 0; | |
4f1c5b7d | 5698 | ctx = DECL_CONTEXT (t); |
5566b478 | 5699 | } |
4393e105 | 5700 | type = tsubst (type, args, /*complain=*/1, in_decl); |
b3da7bb1 MM |
5701 | if (type == error_mark_node) |
5702 | return error_mark_node; | |
8d08fdba | 5703 | |
5566b478 MS |
5704 | /* We do NOT check for matching decls pushed separately at this |
5705 | point, as they may not represent instantiations of this | |
5706 | template, and in any case are considered separate under the | |
0a7394bc | 5707 | discrete model. */ |
0acf7199 | 5708 | r = copy_decl (t); |
e1467ff2 | 5709 | DECL_USE_TEMPLATE (r) = 0; |
5566b478 MS |
5710 | TREE_TYPE (r) = type; |
5711 | ||
4f1c5b7d MM |
5712 | DECL_CONTEXT (r) = ctx; |
5713 | DECL_VIRTUAL_CONTEXT (r) | |
5714 | = tsubst_aggr_type (DECL_VIRTUAL_CONTEXT (t), args, | |
5715 | /*complain=*/1, t, | |
4393e105 | 5716 | /*entering_scope=*/1); |
5566b478 | 5717 | |
1f6e1acc | 5718 | if (member && DECL_CONV_FN_P (r)) |
669ec2b4 JM |
5719 | { |
5720 | /* Type-conversion operator. Reconstruct the name, in | |
5721 | case it's the name of one of the template's parameters. */ | |
5722 | if (flag_new_abi) | |
5723 | DECL_NAME (r) = mangle_conv_op_name_for_type (TREE_TYPE (type)); | |
5724 | else | |
5725 | DECL_NAME (r) = build_typename_overload (TREE_TYPE (type)); | |
5726 | } | |
5566b478 | 5727 | |
4393e105 MM |
5728 | DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args, |
5729 | /*complain=*/1, t); | |
477f6664 | 5730 | DECL_RESULT (r) = NULL_TREE; |
711734a9 JM |
5731 | |
5732 | TREE_STATIC (r) = 0; | |
5733 | TREE_PUBLIC (r) = TREE_PUBLIC (t); | |
5734 | DECL_EXTERNAL (r) = 1; | |
5735 | DECL_INTERFACE_KNOWN (r) = 0; | |
5736 | DECL_DEFER_OUTPUT (r) = 0; | |
5737 | TREE_CHAIN (r) = NULL_TREE; | |
5738 | DECL_PENDING_INLINE_INFO (r) = 0; | |
59026e79 | 5739 | DECL_PENDING_INLINE_P (r) = 0; |
655dc6ee | 5740 | DECL_SAVED_TREE (r) = NULL_TREE; |
711734a9 | 5741 | TREE_USED (r) = 0; |
db9b2174 MM |
5742 | if (DECL_CLONED_FUNCTION (r)) |
5743 | { | |
5744 | DECL_CLONED_FUNCTION (r) = tsubst (DECL_CLONED_FUNCTION (t), | |
5745 | args, /*complain=*/1, t); | |
5746 | TREE_CHAIN (r) = TREE_CHAIN (DECL_CLONED_FUNCTION (r)); | |
5747 | TREE_CHAIN (DECL_CLONED_FUNCTION (r)) = r; | |
5748 | } | |
711734a9 | 5749 | |
36a117a5 MM |
5750 | /* Set up the DECL_TEMPLATE_INFO for R and compute its mangled |
5751 | name. There's no need to do this in the special friend | |
5752 | case mentioned above where GEN_TMPL is NULL. */ | |
5753 | if (gen_tmpl) | |
386b8a85 | 5754 | { |
36a117a5 | 5755 | DECL_TEMPLATE_INFO (r) |
e1b3e07d | 5756 | = tree_cons (gen_tmpl, argvec, NULL_TREE); |
36a117a5 MM |
5757 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
5758 | register_specialization (r, gen_tmpl, argvec); | |
5759 | ||
5760 | /* Set the mangled name for R. */ | |
669ec2b4 JM |
5761 | if (DECL_DESTRUCTOR_P (t)) |
5762 | { | |
5763 | if (flag_new_abi) | |
5764 | set_mangled_name_for_decl (r); | |
5765 | else | |
5766 | DECL_ASSEMBLER_NAME (r) = build_destructor_name (ctx); | |
5767 | } | |
5768 | else | |
5769 | { | |
5770 | /* Instantiations of template functions must be mangled | |
5771 | specially, in order to conform to 14.5.5.1 | |
5772 | [temp.over.link]. */ | |
5773 | tree tmpl = DECL_TI_TEMPLATE (t); | |
5774 | ||
5775 | /* TMPL will be NULL if this is a specialization of a | |
5776 | member function of a template class. */ | |
5777 | if (name_mangling_version < 1 | |
5778 | || tmpl == NULL_TREE | |
5779 | || (member && !is_member_template (tmpl) | |
5780 | && !DECL_TEMPLATE_INFO (tmpl))) | |
5781 | set_mangled_name_for_decl (r); | |
5782 | else | |
5783 | set_mangled_name_for_template_decl (r); | |
5784 | } | |
36a117a5 MM |
5785 | |
5786 | DECL_RTL (r) = 0; | |
5787 | make_decl_rtl (r, NULL_PTR, 1); | |
5788 | ||
5789 | /* Like grokfndecl. If we don't do this, pushdecl will | |
5790 | mess up our TREE_CHAIN because it doesn't find a | |
5791 | previous decl. Sigh. */ | |
5792 | if (member | |
c36ae80f | 5793 | && ! uses_template_parms (r) |
36a117a5 MM |
5794 | && (IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r)) |
5795 | == NULL_TREE)) | |
5796 | SET_IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r), r); | |
9188c363 MM |
5797 | |
5798 | /* We're not supposed to instantiate default arguments | |
5799 | until they are called, for a template. But, for a | |
5800 | declaration like: | |
5801 | ||
5802 | template <class T> void f () | |
5803 | { extern void g(int i = T()); } | |
5804 | ||
5805 | we should do the substitution when the template is | |
5806 | instantiated. We handle the member function case in | |
5807 | instantiate_class_template since the default arguments | |
5808 | might refer to other members of the class. */ | |
5809 | if (!member | |
5810 | && !PRIMARY_TEMPLATE_P (gen_tmpl) | |
5811 | && !uses_template_parms (argvec)) | |
5812 | tsubst_default_arguments (r); | |
386b8a85 | 5813 | } |
f181d4ae | 5814 | |
cf38f48a MM |
5815 | /* Copy the list of befriending classes. */ |
5816 | for (friends = &DECL_BEFRIENDING_CLASSES (r); | |
5817 | *friends; | |
5818 | friends = &TREE_CHAIN (*friends)) | |
5819 | { | |
5820 | *friends = copy_node (*friends); | |
5821 | TREE_VALUE (*friends) = tsubst (TREE_VALUE (*friends), | |
5822 | args, /*complain=*/1, | |
5823 | in_decl); | |
5824 | } | |
5825 | ||
212e7048 | 5826 | if (DECL_CONSTRUCTOR_P (r) || DECL_DESTRUCTOR_P (r)) |
f181d4ae MM |
5827 | { |
5828 | maybe_retrofit_in_chrg (r); | |
212e7048 MM |
5829 | if (DECL_CONSTRUCTOR_P (r)) |
5830 | grok_ctor_properties (ctx, r); | |
2be678ff JM |
5831 | /* If this is an instantiation of a member template, clone it. |
5832 | If it isn't, that'll be handled by | |
5833 | clone_constructors_and_destructors. */ | |
5e818b93 JM |
5834 | if (PRIMARY_TEMPLATE_P (gen_tmpl)) |
5835 | clone_function_decl(r, /*update_method_vec_p=*/0); | |
f181d4ae | 5836 | } |
596ea4e5 | 5837 | else if (IDENTIFIER_OPNAME_P (DECL_NAME (r))) |
f181d4ae | 5838 | grok_op_properties (r, DECL_VIRTUAL_P (r), DECL_FRIEND_P (r)); |
8d08fdba | 5839 | } |
ae58fa02 | 5840 | break; |
8d08fdba MS |
5841 | |
5842 | case PARM_DECL: | |
5843 | { | |
ae58fa02 | 5844 | r = copy_node (t); |
5566b478 | 5845 | TREE_TYPE (r) = type; |
1b8899d1 MM |
5846 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); |
5847 | ||
db2767b6 MM |
5848 | if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX) |
5849 | DECL_INITIAL (r) = TREE_TYPE (r); | |
5850 | else | |
4393e105 MM |
5851 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args, |
5852 | /*complain=*/1, in_decl); | |
db2767b6 | 5853 | |
5566b478 | 5854 | DECL_CONTEXT (r) = NULL_TREE; |
fa56377d JJ |
5855 | if (PROMOTE_PROTOTYPES |
5856 | && (TREE_CODE (type) == INTEGER_TYPE | |
5857 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
f83b0cb6 JM |
5858 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
5859 | DECL_ARG_TYPE (r) = integer_type_node; | |
8d08fdba | 5860 | if (TREE_CHAIN (t)) |
4393e105 MM |
5861 | TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args, |
5862 | /*complain=*/1, TREE_CHAIN (t)); | |
8d08fdba | 5863 | } |
ae58fa02 | 5864 | break; |
8d08fdba | 5865 | |
5566b478 MS |
5866 | case FIELD_DECL: |
5867 | { | |
0acf7199 | 5868 | r = copy_decl (t); |
1b8899d1 MM |
5869 | TREE_TYPE (r) = type; |
5870 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); | |
5871 | ||
5872 | /* We don't have to set DECL_CONTEXT here; it is set by | |
5873 | finish_member_declaration. */ | |
4393e105 MM |
5874 | DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args, |
5875 | /*complain=*/1, in_decl); | |
5566b478 | 5876 | TREE_CHAIN (r) = NULL_TREE; |
4393e105 | 5877 | if (TREE_CODE (type) == VOID_TYPE) |
8251199e | 5878 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5879 | } |
ae58fa02 | 5880 | break; |
5566b478 MS |
5881 | |
5882 | case USING_DECL: | |
5883 | { | |
ae58fa02 | 5884 | r = copy_node (t); |
5566b478 | 5885 | DECL_INITIAL (r) |
4393e105 | 5886 | = tsubst_copy (DECL_INITIAL (t), args, /*complain=*/1, in_decl); |
5566b478 | 5887 | TREE_CHAIN (r) = NULL_TREE; |
5566b478 | 5888 | } |
ae58fa02 | 5889 | break; |
5566b478 | 5890 | |
9188c363 | 5891 | case TYPE_DECL: |
88e1b92a JM |
5892 | if (TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM |
5893 | || t == TYPE_MAIN_DECL (TREE_TYPE (t))) | |
9188c363 | 5894 | { |
88e1b92a JM |
5895 | /* If this is the canonical decl, we don't have to mess with |
5896 | instantiations, and often we can't (for typename, template | |
5897 | type parms and such). Note that TYPE_NAME is not correct for | |
5898 | the above test if we've copied the type for a typedef. */ | |
b9f39201 | 5899 | r = TYPE_NAME (type); |
9188c363 MM |
5900 | break; |
5901 | } | |
5902 | ||
5903 | /* Fall through. */ | |
5904 | ||
5566b478 MS |
5905 | case VAR_DECL: |
5906 | { | |
1cea0434 KG |
5907 | tree argvec = NULL_TREE; |
5908 | tree gen_tmpl = NULL_TREE; | |
36a117a5 | 5909 | tree spec; |
1cea0434 | 5910 | tree tmpl = NULL_TREE; |
9188c363 | 5911 | tree ctx; |
6dfbb909 | 5912 | int local_p; |
9188c363 | 5913 | |
6dfbb909 MM |
5914 | /* Assume this is a non-local variable. */ |
5915 | local_p = 0; | |
5566b478 | 5916 | |
de96bf57 | 5917 | if (TYPE_P (CP_DECL_CONTEXT (t))) |
9188c363 MM |
5918 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
5919 | /*complain=*/1, | |
5920 | in_decl, /*entering_scope=*/1); | |
5921 | else | |
6dfbb909 MM |
5922 | { |
5923 | /* Subsequent calls to pushdecl will fill this in. */ | |
5924 | ctx = NULL_TREE; | |
5925 | if (!DECL_NAMESPACE_SCOPE_P (t)) | |
5926 | local_p = 1; | |
5927 | } | |
9188c363 | 5928 | |
36a117a5 | 5929 | /* Check to see if we already have this specialization. */ |
6dfbb909 MM |
5930 | if (!local_p) |
5931 | { | |
5932 | tmpl = DECL_TI_TEMPLATE (t); | |
5933 | gen_tmpl = most_general_template (tmpl); | |
5934 | argvec = tsubst (DECL_TI_ARGS (t), args, /*complain=*/1, in_decl); | |
5935 | spec = retrieve_specialization (gen_tmpl, argvec); | |
5936 | } | |
9188c363 | 5937 | else |
6dfbb909 | 5938 | spec = retrieve_local_specialization (t); |
9188c363 | 5939 | |
36a117a5 | 5940 | if (spec) |
ae58fa02 MM |
5941 | { |
5942 | r = spec; | |
5943 | break; | |
5944 | } | |
5566b478 | 5945 | |
0acf7199 | 5946 | r = copy_decl (t); |
5566b478 | 5947 | TREE_TYPE (r) = type; |
1b8899d1 | 5948 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); |
5566b478 | 5949 | DECL_CONTEXT (r) = ctx; |
d11ad92e MS |
5950 | |
5951 | /* Don't try to expand the initializer until someone tries to use | |
5952 | this variable; otherwise we run into circular dependencies. */ | |
5953 | DECL_INITIAL (r) = NULL_TREE; | |
5566b478 | 5954 | DECL_RTL (r) = 0; |
06ceef4e | 5955 | DECL_SIZE (r) = DECL_SIZE_UNIT (r) = 0; |
5566b478 | 5956 | |
f9817201 MM |
5957 | /* For __PRETTY_FUNCTION__ we have to adjust the initializer. */ |
5958 | if (DECL_PRETTY_FUNCTION_P (r)) | |
5959 | { | |
5960 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (t), | |
5961 | args, | |
5962 | /*complain=*/1, | |
5963 | NULL_TREE); | |
5964 | TREE_TYPE (r) = TREE_TYPE (DECL_INITIAL (r)); | |
5965 | } | |
5966 | ||
e0942dcd MM |
5967 | /* Even if the original location is out of scope, the newly |
5968 | substituted one is not. */ | |
5969 | if (TREE_CODE (r) == VAR_DECL) | |
5970 | DECL_DEAD_FOR_LOCAL (r) = 0; | |
5971 | ||
6dfbb909 MM |
5972 | if (!local_p) |
5973 | { | |
5974 | /* A static data member declaration is always marked | |
5975 | external when it is declared in-class, even if an | |
5976 | initializer is present. We mimic the non-template | |
5977 | processing here. */ | |
5978 | DECL_EXTERNAL (r) = 1; | |
fa8d6e85 | 5979 | |
6dfbb909 MM |
5980 | register_specialization (r, gen_tmpl, argvec); |
5981 | DECL_TEMPLATE_INFO (r) = tree_cons (tmpl, argvec, NULL_TREE); | |
5982 | SET_DECL_IMPLICIT_INSTANTIATION (r); | |
5983 | } | |
9188c363 | 5984 | else |
6dfbb909 | 5985 | register_local_specialization (r, t); |
5566b478 | 5986 | |
5566b478 | 5987 | TREE_CHAIN (r) = NULL_TREE; |
9188c363 | 5988 | if (TREE_CODE (r) == VAR_DECL && TREE_CODE (type) == VOID_TYPE) |
8251199e | 5989 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5990 | } |
ae58fa02 | 5991 | break; |
5566b478 | 5992 | |
ae58fa02 MM |
5993 | default: |
5994 | my_friendly_abort (0); | |
5995 | } | |
5996 | ||
5997 | /* Restore the file and line information. */ | |
5998 | lineno = saved_lineno; | |
5999 | input_filename = saved_filename; | |
6000 | ||
6001 | return r; | |
6002 | } | |
6003 | ||
cabc336a MM |
6004 | /* Substitue into the ARG_TYPES of a function type. */ |
6005 | ||
e9659ab0 | 6006 | static tree |
4393e105 | 6007 | tsubst_arg_types (arg_types, args, complain, in_decl) |
cabc336a MM |
6008 | tree arg_types; |
6009 | tree args; | |
4393e105 | 6010 | int complain; |
cabc336a MM |
6011 | tree in_decl; |
6012 | { | |
6013 | tree remaining_arg_types; | |
cabc336a MM |
6014 | tree type; |
6015 | ||
6016 | if (!arg_types || arg_types == void_list_node) | |
6017 | return arg_types; | |
6018 | ||
6019 | remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types), | |
4393e105 MM |
6020 | args, complain, in_decl); |
6021 | if (remaining_arg_types == error_mark_node) | |
6022 | return error_mark_node; | |
6023 | ||
6024 | type = tsubst (TREE_VALUE (arg_types), args, complain, in_decl); | |
6025 | if (type == error_mark_node) | |
6026 | return error_mark_node; | |
cabc336a | 6027 | |
4393e105 MM |
6028 | /* Do array-to-pointer, function-to-pointer conversion, and ignore |
6029 | top-level qualifiers as required. */ | |
6030 | type = TYPE_MAIN_VARIANT (type_decays_to (type)); | |
cabc336a MM |
6031 | |
6032 | /* Note that we do not substitute into default arguments here. The | |
6033 | standard mandates that they be instantiated only when needed, | |
6034 | which is done in build_over_call. */ | |
51632249 JM |
6035 | return hash_tree_cons (TREE_PURPOSE (arg_types), type, |
6036 | remaining_arg_types); | |
cabc336a MM |
6037 | |
6038 | } | |
6039 | ||
4393e105 MM |
6040 | /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does |
6041 | *not* handle the exception-specification for FNTYPE, because the | |
6042 | initial substitution of explicitly provided template parameters | |
6043 | during argument deduction forbids substitution into the | |
6044 | exception-specification: | |
6045 | ||
6046 | [temp.deduct] | |
6047 | ||
6048 | All references in the function type of the function template to the | |
6049 | corresponding template parameters are replaced by the specified tem- | |
6050 | plate argument values. If a substitution in a template parameter or | |
6051 | in the function type of the function template results in an invalid | |
6052 | type, type deduction fails. [Note: The equivalent substitution in | |
6053 | exception specifications is done only when the function is instanti- | |
6054 | ated, at which point a program is ill-formed if the substitution | |
6055 | results in an invalid type.] */ | |
6056 | ||
6057 | static tree | |
6058 | tsubst_function_type (t, args, complain, in_decl) | |
6059 | tree t; | |
6060 | tree args; | |
6061 | int complain; | |
6062 | tree in_decl; | |
6063 | { | |
6064 | tree return_type; | |
6065 | tree arg_types; | |
6066 | tree fntype; | |
6067 | ||
8dd3f57a | 6068 | /* The TYPE_CONTEXT is not used for function/method types. */ |
4393e105 MM |
6069 | my_friendly_assert (TYPE_CONTEXT (t) == NULL_TREE, 0); |
6070 | ||
6071 | /* Substitue the return type. */ | |
6072 | return_type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
6073 | if (return_type == error_mark_node) | |
6074 | return error_mark_node; | |
6075 | ||
6076 | /* Substitue the argument types. */ | |
6077 | arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args, | |
6078 | complain, in_decl); | |
6079 | if (arg_types == error_mark_node) | |
6080 | return error_mark_node; | |
6081 | ||
6082 | /* Construct a new type node and return it. */ | |
6083 | if (TREE_CODE (t) == FUNCTION_TYPE) | |
6084 | fntype = build_function_type (return_type, arg_types); | |
6085 | else | |
6086 | { | |
6087 | tree r = TREE_TYPE (TREE_VALUE (arg_types)); | |
6088 | if (! IS_AGGR_TYPE (r)) | |
6089 | { | |
6090 | /* [temp.deduct] | |
6091 | ||
6092 | Type deduction may fail for any of the following | |
6093 | reasons: | |
6094 | ||
6095 | -- Attempting to create "pointer to member of T" when T | |
6096 | is not a class type. */ | |
6097 | if (complain) | |
6098 | cp_error ("creating pointer to member function of non-class type `%T'", | |
6099 | r); | |
6100 | return error_mark_node; | |
6101 | } | |
6102 | ||
6103 | fntype = build_cplus_method_type (r, return_type, TREE_CHAIN | |
6104 | (arg_types)); | |
6105 | } | |
6106 | fntype = build_qualified_type (fntype, TYPE_QUALS (t)); | |
ada846eb | 6107 | fntype = build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (t)); |
4393e105 MM |
6108 | |
6109 | return fntype; | |
6110 | } | |
6111 | ||
297e73d8 MM |
6112 | /* Substitute into the PARMS of a call-declarator. */ |
6113 | ||
e9659ab0 | 6114 | static tree |
4393e105 | 6115 | tsubst_call_declarator_parms (parms, args, complain, in_decl) |
297e73d8 MM |
6116 | tree parms; |
6117 | tree args; | |
4393e105 | 6118 | int complain; |
297e73d8 MM |
6119 | tree in_decl; |
6120 | { | |
6121 | tree new_parms; | |
6122 | tree type; | |
6123 | tree defarg; | |
6124 | ||
6125 | if (!parms || parms == void_list_node) | |
6126 | return parms; | |
6127 | ||
6128 | new_parms = tsubst_call_declarator_parms (TREE_CHAIN (parms), | |
4393e105 | 6129 | args, complain, in_decl); |
297e73d8 MM |
6130 | |
6131 | /* Figure out the type of this parameter. */ | |
4393e105 | 6132 | type = tsubst (TREE_VALUE (parms), args, complain, in_decl); |
297e73d8 MM |
6133 | |
6134 | /* Figure out the default argument as well. Note that we use | |
4393e105 MM |
6135 | tsubst_expr since the default argument is really an expression. */ |
6136 | defarg = tsubst_expr (TREE_PURPOSE (parms), args, complain, in_decl); | |
297e73d8 MM |
6137 | |
6138 | /* Chain this parameter on to the front of those we have already | |
6139 | processed. We don't use hash_tree_cons because that function | |
6140 | doesn't check TREE_PARMLIST. */ | |
6141 | new_parms = tree_cons (defarg, type, new_parms); | |
6142 | ||
6143 | /* And note that these are parameters. */ | |
6144 | TREE_PARMLIST (new_parms) = 1; | |
6145 | ||
6146 | return new_parms; | |
6147 | } | |
6148 | ||
4393e105 MM |
6149 | /* Take the tree structure T and replace template parameters used |
6150 | therein with the argument vector ARGS. IN_DECL is an associated | |
6151 | decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE. | |
6152 | An appropriate error message is issued only if COMPLAIN is | |
6153 | non-zero. Note that we must be relatively non-tolerant of | |
6154 | extensions here, in order to preserve conformance; if we allow | |
6155 | substitutions that should not be allowed, we may allow argument | |
6156 | deductions that should not succeed, and therefore report ambiguous | |
6157 | overload situations where there are none. In theory, we could | |
6158 | allow the substitution, but indicate that it should have failed, | |
6159 | and allow our caller to make sure that the right thing happens, but | |
6160 | we don't try to do this yet. | |
6161 | ||
6162 | This function is used for dealing with types, decls and the like; | |
6163 | for expressions, use tsubst_expr or tsubst_copy. */ | |
ae58fa02 MM |
6164 | |
6165 | tree | |
4393e105 | 6166 | tsubst (t, args, complain, in_decl) |
ae58fa02 | 6167 | tree t, args; |
4393e105 | 6168 | int complain; |
ae58fa02 MM |
6169 | tree in_decl; |
6170 | { | |
0ecfe0b4 | 6171 | tree type, r; |
ae58fa02 MM |
6172 | |
6173 | if (t == NULL_TREE || t == error_mark_node | |
6174 | || t == integer_type_node | |
6175 | || t == void_type_node | |
6176 | || t == char_type_node | |
6177 | || TREE_CODE (t) == NAMESPACE_DECL) | |
6178 | return t; | |
6179 | ||
6180 | if (TREE_CODE (t) == IDENTIFIER_NODE) | |
6181 | type = IDENTIFIER_TYPE_VALUE (t); | |
6182 | else | |
6183 | type = TREE_TYPE (t); | |
6184 | if (type == unknown_type_node) | |
6185 | my_friendly_abort (42); | |
6186 | ||
6187 | if (type && TREE_CODE (t) != FUNCTION_DECL | |
6188 | && TREE_CODE (t) != TYPENAME_TYPE | |
6189 | && TREE_CODE (t) != TEMPLATE_DECL | |
4393e105 MM |
6190 | && TREE_CODE (t) != IDENTIFIER_NODE |
6191 | && TREE_CODE (t) != FUNCTION_TYPE | |
6192 | && TREE_CODE (t) != METHOD_TYPE) | |
6193 | type = tsubst (type, args, complain, in_decl); | |
6194 | if (type == error_mark_node) | |
6195 | return error_mark_node; | |
ae58fa02 | 6196 | |
2f939d94 | 6197 | if (DECL_P (t)) |
ae58fa02 MM |
6198 | return tsubst_decl (t, args, type, in_decl); |
6199 | ||
6200 | switch (TREE_CODE (t)) | |
6201 | { | |
6202 | case RECORD_TYPE: | |
6203 | case UNION_TYPE: | |
6204 | case ENUMERAL_TYPE: | |
4393e105 MM |
6205 | return tsubst_aggr_type (t, args, complain, in_decl, |
6206 | /*entering_scope=*/0); | |
ae58fa02 MM |
6207 | |
6208 | case ERROR_MARK: | |
6209 | case IDENTIFIER_NODE: | |
6210 | case OP_IDENTIFIER: | |
6211 | case VOID_TYPE: | |
6212 | case REAL_TYPE: | |
6213 | case COMPLEX_TYPE: | |
c00996a3 | 6214 | case VECTOR_TYPE: |
ae58fa02 MM |
6215 | case BOOLEAN_TYPE: |
6216 | case INTEGER_CST: | |
6217 | case REAL_CST: | |
6218 | case STRING_CST: | |
6219 | return t; | |
6220 | ||
6221 | case INTEGER_TYPE: | |
6222 | if (t == integer_type_node) | |
6223 | return t; | |
6224 | ||
6225 | if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST | |
6226 | && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST) | |
6227 | return t; | |
d2e5ee5c | 6228 | |
5566b478 | 6229 | { |
ddce3528 | 6230 | tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0); |
7ddedda4 | 6231 | |
ddce3528 | 6232 | max = tsubst_expr (omax, args, complain, in_decl); |
4393e105 MM |
6233 | if (max == error_mark_node) |
6234 | return error_mark_node; | |
6235 | ||
8dd3f57a MM |
6236 | /* See if we can reduce this expression to something simpler. */ |
6237 | max = maybe_fold_nontype_arg (max); | |
fc611ce0 | 6238 | if (!processing_template_decl) |
8dd3f57a MM |
6239 | max = decl_constant_value (max); |
6240 | ||
856216bb MM |
6241 | if (processing_template_decl |
6242 | /* When providing explicit arguments to a template | |
6243 | function, but leaving some arguments for subsequent | |
6244 | deduction, MAX may be template-dependent even if we're | |
c95cd22e JM |
6245 | not PROCESSING_TEMPLATE_DECL. We still need to check for |
6246 | template parms, though; MAX won't be an INTEGER_CST for | |
6247 | dynamic arrays, either. */ | |
6248 | || (TREE_CODE (max) != INTEGER_CST | |
6249 | && uses_template_parms (max))) | |
ae58fa02 | 6250 | { |
8dd3f57a MM |
6251 | tree itype = make_node (INTEGER_TYPE); |
6252 | TYPE_MIN_VALUE (itype) = size_zero_node; | |
6253 | TYPE_MAX_VALUE (itype) = build_min (MINUS_EXPR, sizetype, max, | |
6254 | integer_one_node); | |
6255 | return itype; | |
ae58fa02 MM |
6256 | } |
6257 | ||
ddce3528 JM |
6258 | if (integer_zerop (omax)) |
6259 | { | |
6260 | /* Still allow an explicit array of size zero. */ | |
6261 | if (pedantic) | |
6262 | pedwarn ("creating array with size zero"); | |
6263 | } | |
07c88314 MM |
6264 | else if (integer_zerop (max) |
6265 | || (TREE_CODE (max) == INTEGER_CST | |
6266 | && INT_CST_LT (max, integer_zero_node))) | |
0ecfe0b4 | 6267 | { |
4393e105 MM |
6268 | /* [temp.deduct] |
6269 | ||
6270 | Type deduction may fail for any of the following | |
6271 | reasons: | |
6272 | ||
bf8f3f93 MM |
6273 | Attempting to create an array with a size that is |
6274 | zero or negative. */ | |
4393e105 | 6275 | if (complain) |
16bb3387 | 6276 | cp_error ("creating array with size zero (`%E')", max); |
4393e105 MM |
6277 | |
6278 | return error_mark_node; | |
0ecfe0b4 JM |
6279 | } |
6280 | ||
c95cd22e | 6281 | return compute_array_index_type (NULL_TREE, max); |
ae58fa02 MM |
6282 | } |
6283 | ||
6284 | case TEMPLATE_TYPE_PARM: | |
6285 | case TEMPLATE_TEMPLATE_PARM: | |
a1281f45 | 6286 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
ae58fa02 MM |
6287 | case TEMPLATE_PARM_INDEX: |
6288 | { | |
6289 | int idx; | |
6290 | int level; | |
6291 | int levels; | |
0ecfe0b4 JM |
6292 | |
6293 | r = NULL_TREE; | |
ae58fa02 MM |
6294 | |
6295 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM | |
a1281f45 KL |
6296 | || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM |
6297 | || TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
ae58fa02 MM |
6298 | { |
6299 | idx = TEMPLATE_TYPE_IDX (t); | |
6300 | level = TEMPLATE_TYPE_LEVEL (t); | |
6301 | } | |
6302 | else | |
6303 | { | |
6304 | idx = TEMPLATE_PARM_IDX (t); | |
6305 | level = TEMPLATE_PARM_LEVEL (t); | |
6306 | } | |
6307 | ||
6308 | if (TREE_VEC_LENGTH (args) > 0) | |
6309 | { | |
6310 | tree arg = NULL_TREE; | |
6311 | ||
6312 | levels = TMPL_ARGS_DEPTH (args); | |
6313 | if (level <= levels) | |
6314 | arg = TMPL_ARG (args, level, idx); | |
6315 | ||
8b5b8b7c MM |
6316 | if (arg == error_mark_node) |
6317 | return error_mark_node; | |
6318 | else if (arg != NULL_TREE) | |
ae58fa02 MM |
6319 | { |
6320 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM) | |
6321 | { | |
2f939d94 | 6322 | my_friendly_assert (TYPE_P (arg), 0); |
adecb3f4 MM |
6323 | return cp_build_qualified_type_real |
6324 | (arg, CP_TYPE_QUALS (arg) | CP_TYPE_QUALS (t), | |
6325 | complain); | |
ae58fa02 | 6326 | } |
a1281f45 | 6327 | else if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) |
ae58fa02 | 6328 | { |
a1281f45 KL |
6329 | /* We are processing a type constructed from |
6330 | a template template parameter */ | |
6331 | tree argvec = tsubst (TYPE_TI_ARGS (t), | |
6332 | args, complain, in_decl); | |
6333 | if (argvec == error_mark_node) | |
6334 | return error_mark_node; | |
4393e105 | 6335 | |
a1281f45 KL |
6336 | /* We can get a TEMPLATE_TEMPLATE_PARM here when |
6337 | we are resolving nested-types in the signature of | |
6338 | a member function templates. | |
6339 | Otherwise ARG is a TEMPLATE_DECL and is the real | |
6340 | template to be instantiated. */ | |
6341 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
6342 | arg = TYPE_NAME (arg); | |
6343 | ||
6344 | r = lookup_template_class (arg, | |
6345 | argvec, in_decl, | |
6346 | DECL_CONTEXT (arg), | |
6347 | /*entering_scope=*/0); | |
6348 | return cp_build_qualified_type_real (r, | |
6349 | TYPE_QUALS (t), | |
6350 | complain); | |
ae58fa02 MM |
6351 | } |
6352 | else | |
a1281f45 | 6353 | /* TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX. */ |
ae58fa02 MM |
6354 | return arg; |
6355 | } | |
6356 | } | |
51924768 JM |
6357 | else |
6358 | my_friendly_abort (981018); | |
ae58fa02 MM |
6359 | |
6360 | if (level == 1) | |
6361 | /* This can happen during the attempted tsubst'ing in | |
6362 | unify. This means that we don't yet have any information | |
6363 | about the template parameter in question. */ | |
6364 | return t; | |
6365 | ||
6366 | /* If we get here, we must have been looking at a parm for a | |
6367 | more deeply nested template. Make a new version of this | |
6368 | template parameter, but with a lower level. */ | |
6369 | switch (TREE_CODE (t)) | |
6370 | { | |
6371 | case TEMPLATE_TYPE_PARM: | |
6372 | case TEMPLATE_TEMPLATE_PARM: | |
a1281f45 | 6373 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
9ccf6541 | 6374 | if (CP_TYPE_QUALS (t)) |
ae58fa02 | 6375 | { |
9ccf6541 MM |
6376 | r = tsubst (TYPE_MAIN_VARIANT (t), args, complain, in_decl); |
6377 | r = cp_build_qualified_type_real (r, CP_TYPE_QUALS (t), | |
6378 | complain); | |
6379 | } | |
6380 | else | |
6381 | { | |
6382 | r = copy_node (t); | |
6383 | TEMPLATE_TYPE_PARM_INDEX (r) | |
6384 | = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t), | |
6385 | r, levels); | |
6386 | TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r); | |
6387 | TYPE_MAIN_VARIANT (r) = r; | |
6388 | TYPE_POINTER_TO (r) = NULL_TREE; | |
6389 | TYPE_REFERENCE_TO (r) = NULL_TREE; | |
6390 | ||
a1281f45 | 6391 | if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM) |
9ccf6541 MM |
6392 | { |
6393 | tree argvec = tsubst (TYPE_TI_ARGS (t), args, | |
6394 | complain, in_decl); | |
6395 | if (argvec == error_mark_node) | |
6396 | return error_mark_node; | |
4393e105 | 6397 | |
9ccf6541 MM |
6398 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r) |
6399 | = tree_cons (TYPE_TI_TEMPLATE (t), argvec, NULL_TREE); | |
6400 | } | |
ae58fa02 MM |
6401 | } |
6402 | break; | |
6403 | ||
6404 | case TEMPLATE_PARM_INDEX: | |
6405 | r = reduce_template_parm_level (t, type, levels); | |
6406 | break; | |
6407 | ||
6408 | default: | |
6409 | my_friendly_abort (0); | |
6410 | } | |
6411 | ||
5566b478 | 6412 | return r; |
ae58fa02 | 6413 | } |
5566b478 | 6414 | |
8d08fdba MS |
6415 | case TREE_LIST: |
6416 | { | |
6417 | tree purpose, value, chain, result; | |
8d08fdba MS |
6418 | |
6419 | if (t == void_list_node) | |
6420 | return t; | |
6421 | ||
8d08fdba MS |
6422 | purpose = TREE_PURPOSE (t); |
6423 | if (purpose) | |
4393e105 MM |
6424 | { |
6425 | purpose = tsubst (purpose, args, complain, in_decl); | |
6426 | if (purpose == error_mark_node) | |
6427 | return error_mark_node; | |
6428 | } | |
8d08fdba MS |
6429 | value = TREE_VALUE (t); |
6430 | if (value) | |
4393e105 MM |
6431 | { |
6432 | value = tsubst (value, args, complain, in_decl); | |
6433 | if (value == error_mark_node) | |
6434 | return error_mark_node; | |
6435 | } | |
8d08fdba MS |
6436 | chain = TREE_CHAIN (t); |
6437 | if (chain && chain != void_type_node) | |
4393e105 MM |
6438 | { |
6439 | chain = tsubst (chain, args, complain, in_decl); | |
6440 | if (chain == error_mark_node) | |
6441 | return error_mark_node; | |
6442 | } | |
8d08fdba MS |
6443 | if (purpose == TREE_PURPOSE (t) |
6444 | && value == TREE_VALUE (t) | |
6445 | && chain == TREE_CHAIN (t)) | |
6446 | return t; | |
51632249 | 6447 | result = hash_tree_cons (purpose, value, chain); |
8d08fdba MS |
6448 | TREE_PARMLIST (result) = TREE_PARMLIST (t); |
6449 | return result; | |
6450 | } | |
6451 | case TREE_VEC: | |
5566b478 MS |
6452 | if (type != NULL_TREE) |
6453 | { | |
1ceaad38 JM |
6454 | /* A binfo node. We always need to make a copy, of the node |
6455 | itself and of its BINFO_BASETYPES. */ | |
85b71cf2 | 6456 | |
5566b478 MS |
6457 | t = copy_node (t); |
6458 | ||
c7449f2b JM |
6459 | /* Make sure type isn't a typedef copy. */ |
6460 | type = BINFO_TYPE (TYPE_BINFO (type)); | |
6461 | ||
5566b478 | 6462 | TREE_TYPE (t) = complete_type (type); |
6633d636 MS |
6463 | if (IS_AGGR_TYPE (type)) |
6464 | { | |
6465 | BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (type); | |
6466 | BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (type); | |
6467 | if (TYPE_BINFO_BASETYPES (type) != NULL_TREE) | |
6468 | BINFO_BASETYPES (t) = copy_node (TYPE_BINFO_BASETYPES (type)); | |
6469 | } | |
5566b478 MS |
6470 | return t; |
6471 | } | |
85b71cf2 JM |
6472 | |
6473 | /* Otherwise, a vector of template arguments. */ | |
4393e105 | 6474 | return tsubst_template_arg_vector (t, args, complain); |
8d08fdba | 6475 | |
8d08fdba MS |
6476 | case POINTER_TYPE: |
6477 | case REFERENCE_TYPE: | |
6478 | { | |
8d08fdba | 6479 | enum tree_code code; |
79a7c7fa | 6480 | |
8d08fdba MS |
6481 | if (type == TREE_TYPE (t)) |
6482 | return t; | |
6483 | ||
6484 | code = TREE_CODE (t); | |
4393e105 MM |
6485 | |
6486 | ||
6487 | /* [temp.deduct] | |
6488 | ||
6489 | Type deduction may fail for any of the following | |
6490 | reasons: | |
6491 | ||
6492 | -- Attempting to create a pointer to reference type. | |
6493 | -- Attempting to create a reference to a reference type or | |
6494 | a reference to void. */ | |
0ecfe0b4 JM |
6495 | if (TREE_CODE (type) == REFERENCE_TYPE |
6496 | || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE)) | |
79a7c7fa JM |
6497 | { |
6498 | static int last_line = 0; | |
3b304f5b | 6499 | static const char* last_file = 0; |
79a7c7fa JM |
6500 | |
6501 | /* We keep track of the last time we issued this error | |
6502 | message to avoid spewing a ton of messages during a | |
6503 | single bad template instantiation. */ | |
4393e105 MM |
6504 | if (complain && (last_line != lineno || |
6505 | last_file != input_filename)) | |
79a7c7fa | 6506 | { |
0ecfe0b4 JM |
6507 | if (TREE_CODE (type) == VOID_TYPE) |
6508 | cp_error ("forming reference to void"); | |
6509 | else | |
6510 | cp_error ("forming %s to reference type `%T'", | |
6511 | (code == POINTER_TYPE) ? "pointer" : "reference", | |
6512 | type); | |
79a7c7fa JM |
6513 | last_line = lineno; |
6514 | last_file = input_filename; | |
6515 | } | |
6516 | ||
4393e105 | 6517 | return error_mark_node; |
79a7c7fa JM |
6518 | } |
6519 | else if (code == POINTER_TYPE) | |
8d08fdba MS |
6520 | r = build_pointer_type (type); |
6521 | else | |
6522 | r = build_reference_type (type); | |
adecb3f4 | 6523 | r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain); |
79a7c7fa | 6524 | |
a5f1c5f8 NS |
6525 | if (r != error_mark_node) |
6526 | /* Will this ever be needed for TYPE_..._TO values? */ | |
6527 | layout_type (r); | |
6528 | ||
8d08fdba MS |
6529 | return r; |
6530 | } | |
a4443a08 | 6531 | case OFFSET_TYPE: |
0ecfe0b4 | 6532 | { |
4393e105 MM |
6533 | r = tsubst (TYPE_OFFSET_BASETYPE (t), args, complain, in_decl); |
6534 | if (r == error_mark_node || !IS_AGGR_TYPE (r)) | |
6535 | { | |
6536 | /* [temp.deduct] | |
6537 | ||
6538 | Type deduction may fail for any of the following | |
6539 | reasons: | |
6540 | ||
6541 | -- Attempting to create "pointer to member of T" when T | |
6542 | is not a class type. */ | |
6543 | if (complain) | |
6544 | cp_error ("creating pointer to member of non-class type `%T'", | |
6545 | r); | |
6546 | return error_mark_node; | |
6547 | } | |
0ecfe0b4 JM |
6548 | return build_offset_type (r, type); |
6549 | } | |
8d08fdba MS |
6550 | case FUNCTION_TYPE: |
6551 | case METHOD_TYPE: | |
6552 | { | |
c11b6f21 | 6553 | tree fntype; |
4393e105 | 6554 | tree raises; |
8d08fdba | 6555 | |
4393e105 MM |
6556 | fntype = tsubst_function_type (t, args, complain, in_decl); |
6557 | if (fntype == error_mark_node) | |
6558 | return error_mark_node; | |
cabc336a MM |
6559 | |
6560 | /* Substitue the exception specification. */ | |
6561 | raises = TYPE_RAISES_EXCEPTIONS (t); | |
c11b6f21 MS |
6562 | if (raises) |
6563 | { | |
4cc1d462 NS |
6564 | tree list = NULL_TREE; |
6565 | ||
6566 | if (! TREE_VALUE (raises)) | |
6567 | list = raises; | |
6568 | else | |
6569 | for (; raises != NULL_TREE; raises = TREE_CHAIN (raises)) | |
6570 | { | |
6571 | tree spec = TREE_VALUE (raises); | |
6572 | ||
6573 | spec = tsubst (spec, args, complain, in_decl); | |
6574 | if (spec == error_mark_node) | |
6575 | return spec; | |
6576 | list = add_exception_specifier (list, spec, complain); | |
6577 | } | |
6578 | fntype = build_exception_variant (fntype, list); | |
c11b6f21 MS |
6579 | } |
6580 | return fntype; | |
8d08fdba MS |
6581 | } |
6582 | case ARRAY_TYPE: | |
6583 | { | |
4393e105 MM |
6584 | tree domain = tsubst (TYPE_DOMAIN (t), args, complain, in_decl); |
6585 | if (domain == error_mark_node) | |
6586 | return error_mark_node; | |
6587 | ||
6588 | /* As an optimization, we avoid regenerating the array type if | |
6589 | it will obviously be the same as T. */ | |
8d08fdba MS |
6590 | if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) |
6591 | return t; | |
0ecfe0b4 | 6592 | |
4393e105 MM |
6593 | /* These checks should match the ones in grokdeclarator. |
6594 | ||
6595 | [temp.deduct] | |
6596 | ||
6597 | The deduction may fail for any of the following reasons: | |
6598 | ||
6599 | -- Attempting to create an array with an element type that | |
6600 | is void, a function type, or a reference type. */ | |
6601 | if (TREE_CODE (type) == VOID_TYPE | |
6602 | || TREE_CODE (type) == FUNCTION_TYPE | |
6603 | || TREE_CODE (type) == REFERENCE_TYPE) | |
0ecfe0b4 | 6604 | { |
4393e105 MM |
6605 | if (complain) |
6606 | cp_error ("creating array of `%T'", type); | |
6607 | return error_mark_node; | |
0ecfe0b4 JM |
6608 | } |
6609 | ||
8d08fdba MS |
6610 | r = build_cplus_array_type (type, domain); |
6611 | return r; | |
6612 | } | |
6613 | ||
8d08fdba | 6614 | case PLUS_EXPR: |
5566b478 | 6615 | case MINUS_EXPR: |
4393e105 MM |
6616 | { |
6617 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6618 | in_decl); | |
6619 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, | |
6620 | in_decl); | |
6621 | ||
6622 | if (e1 == error_mark_node || e2 == error_mark_node) | |
6623 | return error_mark_node; | |
6624 | ||
6625 | return fold (build (TREE_CODE (t), TREE_TYPE (t), e1, e2)); | |
6626 | } | |
8d08fdba MS |
6627 | |
6628 | case NEGATE_EXPR: | |
6629 | case NOP_EXPR: | |
4393e105 MM |
6630 | { |
6631 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6632 | in_decl); | |
6633 | if (e == error_mark_node) | |
6634 | return error_mark_node; | |
6635 | ||
6636 | return fold (build (TREE_CODE (t), TREE_TYPE (t), e)); | |
6637 | } | |
8d08fdba | 6638 | |
5566b478 MS |
6639 | case TYPENAME_TYPE: |
6640 | { | |
4393e105 MM |
6641 | tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain, |
6642 | in_decl, /*entering_scope=*/1); | |
6643 | tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args, | |
6644 | complain, in_decl); | |
6645 | ||
6646 | if (ctx == error_mark_node || f == error_mark_node) | |
6647 | return error_mark_node; | |
ae58fa02 | 6648 | |
bf8f3f93 MM |
6649 | if (!IS_AGGR_TYPE (ctx)) |
6650 | { | |
6651 | if (complain) | |
6652 | cp_error ("`%T' is not a class, struct, or union type", | |
6653 | ctx); | |
6654 | return error_mark_node; | |
6655 | } | |
6656 | else if (!uses_template_parms (ctx) && !TYPE_BEING_DEFINED (ctx)) | |
6657 | { | |
6658 | /* Normally, make_typename_type does not require that the CTX | |
6659 | have complete type in order to allow things like: | |
ae58fa02 | 6660 | |
bf8f3f93 | 6661 | template <class T> struct S { typename S<T>::X Y; }; |
ae58fa02 | 6662 | |
bf8f3f93 MM |
6663 | But, such constructs have already been resolved by this |
6664 | point, so here CTX really should have complete type, unless | |
6665 | it's a partial instantiation. */ | |
4393e105 | 6666 | ctx = complete_type (ctx); |
d0f062fb | 6667 | if (!COMPLETE_TYPE_P (ctx)) |
4393e105 MM |
6668 | { |
6669 | if (complain) | |
6670 | incomplete_type_error (NULL_TREE, ctx); | |
6671 | return error_mark_node; | |
6672 | } | |
6673 | } | |
ae58fa02 | 6674 | |
3baa501d | 6675 | f = make_typename_type (ctx, f, complain); |
f0bcd168 MM |
6676 | if (f == error_mark_node) |
6677 | return f; | |
adecb3f4 MM |
6678 | return cp_build_qualified_type_real (f, |
6679 | CP_TYPE_QUALS (f) | |
6680 | | CP_TYPE_QUALS (t), | |
6681 | complain); | |
5566b478 MS |
6682 | } |
6683 | ||
6684 | case INDIRECT_REF: | |
4393e105 MM |
6685 | { |
6686 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6687 | in_decl); | |
6688 | if (e == error_mark_node) | |
6689 | return error_mark_node; | |
6690 | return make_pointer_declarator (type, e); | |
6691 | } | |
6692 | ||
5566b478 | 6693 | case ADDR_EXPR: |
4393e105 MM |
6694 | { |
6695 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6696 | in_decl); | |
6697 | if (e == error_mark_node) | |
6698 | return error_mark_node; | |
6699 | return make_reference_declarator (type, e); | |
6700 | } | |
5566b478 MS |
6701 | |
6702 | case ARRAY_REF: | |
4393e105 MM |
6703 | { |
6704 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6705 | in_decl); | |
6fb2c05a JM |
6706 | tree e2 = tsubst_expr (TREE_OPERAND (t, 1), args, complain, |
6707 | in_decl); | |
4393e105 MM |
6708 | if (e1 == error_mark_node || e2 == error_mark_node) |
6709 | return error_mark_node; | |
6710 | ||
6711 | return build_parse_node (ARRAY_REF, e1, e2, tsubst_expr); | |
6712 | } | |
5566b478 MS |
6713 | |
6714 | case CALL_EXPR: | |
4393e105 MM |
6715 | { |
6716 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6717 | in_decl); | |
43f887f9 MM |
6718 | tree e2 = (tsubst_call_declarator_parms |
6719 | (CALL_DECLARATOR_PARMS (t), args, complain, in_decl)); | |
6720 | tree e3 = tsubst (CALL_DECLARATOR_EXCEPTION_SPEC (t), args, | |
6721 | complain, in_decl); | |
4393e105 MM |
6722 | |
6723 | if (e1 == error_mark_node || e2 == error_mark_node | |
6724 | || e3 == error_mark_node) | |
6725 | return error_mark_node; | |
6726 | ||
43f887f9 | 6727 | return make_call_declarator (e1, e2, CALL_DECLARATOR_QUALS (t), e3); |
4393e105 | 6728 | } |
5566b478 | 6729 | |
fc378698 | 6730 | case SCOPE_REF: |
4393e105 MM |
6731 | { |
6732 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6733 | in_decl); | |
6734 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl); | |
6735 | if (e1 == error_mark_node || e2 == error_mark_node) | |
6736 | return error_mark_node; | |
6737 | ||
6738 | return build_parse_node (TREE_CODE (t), e1, e2); | |
6739 | } | |
fc378698 | 6740 | |
b894fc05 | 6741 | case TYPEOF_TYPE: |
4393e105 MM |
6742 | { |
6743 | tree e1 = tsubst_expr (TYPE_FIELDS (t), args, complain, | |
6744 | in_decl); | |
6745 | if (e1 == error_mark_node) | |
6746 | return error_mark_node; | |
6747 | ||
6748 | return TREE_TYPE (e1); | |
6749 | } | |
b894fc05 | 6750 | |
f9817201 MM |
6751 | case FUNCTION_NAME: |
6752 | { | |
6753 | const char *name; | |
6754 | int len; | |
6755 | tree type; | |
6756 | tree str; | |
6757 | ||
6758 | /* This code should match declare_hidden_char_array in | |
6759 | c-common.c. */ | |
6760 | name = (*decl_printable_name) (current_function_decl, 2); | |
6761 | len = strlen (name) + 1; | |
6762 | type = build_array_type (char_type_node, | |
6763 | build_index_type (build_int_2 (len, 0))); | |
6764 | str = build_string (len, name); | |
6765 | TREE_TYPE (str) = type; | |
6766 | return str; | |
6767 | } | |
6768 | ||
8d08fdba | 6769 | default: |
5566b478 | 6770 | sorry ("use of `%s' in template", |
8d08fdba MS |
6771 | tree_code_name [(int) TREE_CODE (t)]); |
6772 | return error_mark_node; | |
6773 | } | |
6774 | } | |
6775 | ||
00d3396f JM |
6776 | /* Like tsubst, but deals with expressions. This function just replaces |
6777 | template parms; to finish processing the resultant expression, use | |
6778 | tsubst_expr. */ | |
6779 | ||
5566b478 | 6780 | tree |
4393e105 | 6781 | tsubst_copy (t, args, complain, in_decl) |
98c1c668 | 6782 | tree t, args; |
4393e105 | 6783 | int complain; |
5566b478 MS |
6784 | tree in_decl; |
6785 | { | |
6786 | enum tree_code code; | |
8452b1d3 | 6787 | tree r; |
8d08fdba | 6788 | |
5566b478 MS |
6789 | if (t == NULL_TREE || t == error_mark_node) |
6790 | return t; | |
6791 | ||
6792 | code = TREE_CODE (t); | |
b7484fbe | 6793 | |
5566b478 MS |
6794 | switch (code) |
6795 | { | |
6796 | case PARM_DECL: | |
a759e627 | 6797 | return do_identifier (DECL_NAME (t), 0, NULL_TREE); |
5566b478 MS |
6798 | |
6799 | case CONST_DECL: | |
ed44da02 MM |
6800 | { |
6801 | tree enum_type; | |
6802 | tree v; | |
6803 | ||
6804 | if (!DECL_CONTEXT (t)) | |
6805 | /* This is a global enumeration constant. */ | |
6806 | return t; | |
6807 | ||
6808 | /* Unfortunately, we cannot just call lookup_name here. | |
9188c363 MM |
6809 | Consider: |
6810 | ||
6811 | template <int I> int f() { | |
6812 | enum E { a = I }; | |
6813 | struct S { void g() { E e = a; } }; | |
6814 | }; | |
6815 | ||
6816 | When we instantiate f<7>::S::g(), say, lookup_name is not | |
6817 | clever enough to find f<7>::a. */ | |
ed44da02 | 6818 | enum_type |
4393e105 | 6819 | = tsubst_aggr_type (TREE_TYPE (t), args, complain, in_decl, |
ed44da02 MM |
6820 | /*entering_scope=*/0); |
6821 | ||
6822 | for (v = TYPE_VALUES (enum_type); | |
6823 | v != NULL_TREE; | |
6824 | v = TREE_CHAIN (v)) | |
6825 | if (TREE_PURPOSE (v) == DECL_NAME (t)) | |
6826 | return TREE_VALUE (v); | |
6827 | ||
6828 | /* We didn't find the name. That should never happen; if | |
6829 | name-lookup found it during preliminary parsing, we | |
6830 | should find it again here during instantiation. */ | |
6831 | my_friendly_abort (0); | |
6832 | } | |
db04386f | 6833 | return t; |
ed44da02 | 6834 | |
5566b478 MS |
6835 | case FIELD_DECL: |
6836 | if (DECL_CONTEXT (t)) | |
6837 | { | |
0978790f | 6838 | tree ctx; |
0978790f | 6839 | |
4393e105 | 6840 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, complain, in_decl, |
36a117a5 | 6841 | /*entering_scope=*/1); |
0978790f | 6842 | if (ctx != DECL_CONTEXT (t)) |
5566b478 MS |
6843 | return lookup_field (ctx, DECL_NAME (t), 0, 0); |
6844 | } | |
6845 | return t; | |
6846 | ||
6847 | case VAR_DECL: | |
6848 | case FUNCTION_DECL: | |
6849 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)) | |
4393e105 | 6850 | t = tsubst (t, args, complain, in_decl); |
5566b478 MS |
6851 | mark_used (t); |
6852 | return t; | |
6853 | ||
98c1c668 JM |
6854 | case TEMPLATE_DECL: |
6855 | if (is_member_template (t)) | |
4393e105 | 6856 | return tsubst (t, args, complain, in_decl); |
98c1c668 JM |
6857 | else |
6858 | return t; | |
6859 | ||
672476cb MM |
6860 | case LOOKUP_EXPR: |
6861 | { | |
6862 | /* We must tsbust into a LOOKUP_EXPR in case the names to | |
6863 | which it refers is a conversion operator; in that case the | |
6864 | name will change. We avoid making unnecessary copies, | |
6865 | however. */ | |
6866 | ||
4393e105 | 6867 | tree id = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl); |
672476cb MM |
6868 | |
6869 | if (id != TREE_OPERAND (t, 0)) | |
6870 | { | |
8452b1d3 | 6871 | r = build_nt (LOOKUP_EXPR, id); |
672476cb MM |
6872 | LOOKUP_EXPR_GLOBAL (r) = LOOKUP_EXPR_GLOBAL (t); |
6873 | t = r; | |
6874 | } | |
6875 | ||
6876 | return t; | |
6877 | } | |
6878 | ||
5566b478 MS |
6879 | case CAST_EXPR: |
6880 | case REINTERPRET_CAST_EXPR: | |
e92cc029 MS |
6881 | case CONST_CAST_EXPR: |
6882 | case STATIC_CAST_EXPR: | |
6883 | case DYNAMIC_CAST_EXPR: | |
51924768 | 6884 | case NOP_EXPR: |
5566b478 | 6885 | return build1 |
4393e105 MM |
6886 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
6887 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); | |
5566b478 MS |
6888 | |
6889 | case INDIRECT_REF: | |
6890 | case PREDECREMENT_EXPR: | |
6891 | case PREINCREMENT_EXPR: | |
6892 | case POSTDECREMENT_EXPR: | |
6893 | case POSTINCREMENT_EXPR: | |
6894 | case NEGATE_EXPR: | |
6895 | case TRUTH_NOT_EXPR: | |
b87692e5 | 6896 | case BIT_NOT_EXPR: |
5566b478 MS |
6897 | case ADDR_EXPR: |
6898 | case CONVERT_EXPR: /* Unary + */ | |
6899 | case SIZEOF_EXPR: | |
abff8e06 | 6900 | case ALIGNOF_EXPR: |
5566b478 | 6901 | case ARROW_EXPR: |
fc378698 | 6902 | case THROW_EXPR: |
5156628f | 6903 | case TYPEID_EXPR: |
f5733617 SS |
6904 | case REALPART_EXPR: |
6905 | case IMAGPART_EXPR: | |
5566b478 | 6906 | return build1 |
6a629cac | 6907 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
4393e105 | 6908 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); |
5566b478 MS |
6909 | |
6910 | case PLUS_EXPR: | |
6911 | case MINUS_EXPR: | |
6912 | case MULT_EXPR: | |
6913 | case TRUNC_DIV_EXPR: | |
6914 | case CEIL_DIV_EXPR: | |
6915 | case FLOOR_DIV_EXPR: | |
6916 | case ROUND_DIV_EXPR: | |
6917 | case EXACT_DIV_EXPR: | |
6918 | case BIT_AND_EXPR: | |
6919 | case BIT_ANDTC_EXPR: | |
6920 | case BIT_IOR_EXPR: | |
6921 | case BIT_XOR_EXPR: | |
6922 | case TRUNC_MOD_EXPR: | |
6923 | case FLOOR_MOD_EXPR: | |
6924 | case TRUTH_ANDIF_EXPR: | |
6925 | case TRUTH_ORIF_EXPR: | |
6926 | case TRUTH_AND_EXPR: | |
6927 | case TRUTH_OR_EXPR: | |
6928 | case RSHIFT_EXPR: | |
6929 | case LSHIFT_EXPR: | |
6930 | case RROTATE_EXPR: | |
6931 | case LROTATE_EXPR: | |
6932 | case EQ_EXPR: | |
6933 | case NE_EXPR: | |
6934 | case MAX_EXPR: | |
6935 | case MIN_EXPR: | |
6936 | case LE_EXPR: | |
6937 | case GE_EXPR: | |
6938 | case LT_EXPR: | |
6939 | case GT_EXPR: | |
6940 | case COMPONENT_REF: | |
6941 | case ARRAY_REF: | |
6942 | case COMPOUND_EXPR: | |
6943 | case SCOPE_REF: | |
6944 | case DOTSTAR_EXPR: | |
6945 | case MEMBER_REF: | |
6946 | return build_nt | |
4393e105 MM |
6947 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
6948 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 MS |
6949 | |
6950 | case CALL_EXPR: | |
6951 | { | |
6952 | tree fn = TREE_OPERAND (t, 0); | |
f84b4be9 | 6953 | if (is_overloaded_fn (fn)) |
4393e105 | 6954 | fn = tsubst_copy (get_first_fn (fn), args, complain, in_decl); |
5566b478 | 6955 | else |
f84b4be9 | 6956 | /* Sometimes FN is a LOOKUP_EXPR. */ |
4393e105 | 6957 | fn = tsubst_copy (fn, args, complain, in_decl); |
5566b478 | 6958 | return build_nt |
4393e105 MM |
6959 | (code, fn, tsubst_copy (TREE_OPERAND (t, 1), args, complain, |
6960 | in_decl), | |
5566b478 MS |
6961 | NULL_TREE); |
6962 | } | |
6963 | ||
6964 | case METHOD_CALL_EXPR: | |
6965 | { | |
6966 | tree name = TREE_OPERAND (t, 0); | |
6967 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
6968 | { | |
4393e105 MM |
6969 | name = tsubst_copy (TREE_OPERAND (name, 0), args, |
6970 | complain, in_decl); | |
7bae46f4 | 6971 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6972 | } |
6973 | else if (TREE_CODE (name) == SCOPE_REF | |
6974 | && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR) | |
6975 | { | |
4393e105 MM |
6976 | tree base = tsubst_copy (TREE_OPERAND (name, 0), args, |
6977 | complain, in_decl); | |
5566b478 | 6978 | name = TREE_OPERAND (name, 1); |
4393e105 MM |
6979 | name = tsubst_copy (TREE_OPERAND (name, 0), args, |
6980 | complain, in_decl); | |
11686454 | 6981 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6982 | name = build_nt (SCOPE_REF, base, name); |
6983 | } | |
6984 | else | |
4393e105 | 6985 | name = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl); |
5566b478 | 6986 | return build_nt |
4393e105 MM |
6987 | (code, name, tsubst_copy (TREE_OPERAND (t, 1), args, |
6988 | complain, in_decl), | |
6989 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl), | |
5566b478 MS |
6990 | NULL_TREE); |
6991 | } | |
6992 | ||
558475f0 MM |
6993 | case STMT_EXPR: |
6994 | /* This processing should really occur in tsubst_expr, However, | |
6995 | tsubst_expr does not recurse into expressions, since it | |
6996 | assumes that there aren't any statements inside them. | |
6997 | Instead, it simply calls build_expr_from_tree. So, we need | |
6998 | to expand the STMT_EXPR here. */ | |
6999 | if (!processing_template_decl) | |
7000 | { | |
b5ac18ea | 7001 | tree stmt_expr = begin_stmt_expr (); |
447cfcb9 MM |
7002 | tsubst_expr (STMT_EXPR_STMT (t), args, |
7003 | complain, in_decl); | |
b5ac18ea | 7004 | return finish_stmt_expr (stmt_expr); |
558475f0 | 7005 | } |
9d9169de MM |
7006 | |
7007 | return t; | |
558475f0 | 7008 | |
5566b478 MS |
7009 | case COND_EXPR: |
7010 | case MODOP_EXPR: | |
40242ccf | 7011 | case PSEUDO_DTOR_EXPR: |
67da3287 | 7012 | { |
8452b1d3 | 7013 | r = build_nt |
4393e105 MM |
7014 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7015 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
7016 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
67da3287 MM |
7017 | return r; |
7018 | } | |
5566b478 MS |
7019 | |
7020 | case NEW_EXPR: | |
7021 | { | |
8452b1d3 | 7022 | r = build_nt |
4393e105 MM |
7023 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7024 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
7025 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
5566b478 MS |
7026 | NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t); |
7027 | return r; | |
7028 | } | |
7029 | ||
7030 | case DELETE_EXPR: | |
7031 | { | |
8452b1d3 | 7032 | r = build_nt |
4393e105 MM |
7033 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
7034 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 MS |
7035 | DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t); |
7036 | DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t); | |
7037 | return r; | |
7038 | } | |
7039 | ||
386b8a85 JM |
7040 | case TEMPLATE_ID_EXPR: |
7041 | { | |
00d3396f | 7042 | /* Substituted template arguments */ |
4393e105 MM |
7043 | tree targs = tsubst_copy (TREE_OPERAND (t, 1), args, complain, |
7044 | in_decl); | |
856216bb MM |
7045 | |
7046 | if (targs && TREE_CODE (targs) == TREE_LIST) | |
7047 | { | |
7048 | tree chain; | |
7049 | for (chain = targs; chain; chain = TREE_CHAIN (chain)) | |
7050 | TREE_VALUE (chain) = maybe_fold_nontype_arg (TREE_VALUE (chain)); | |
7051 | } | |
7052 | else if (targs) | |
7053 | { | |
7054 | int i; | |
7055 | for (i = 0; i < TREE_VEC_LENGTH (targs); ++i) | |
7056 | TREE_VEC_ELT (targs, i) | |
7057 | = maybe_fold_nontype_arg (TREE_VEC_ELT (targs, i)); | |
7058 | } | |
00d3396f JM |
7059 | |
7060 | return lookup_template_function | |
4393e105 | 7061 | (tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), targs); |
386b8a85 JM |
7062 | } |
7063 | ||
5566b478 MS |
7064 | case TREE_LIST: |
7065 | { | |
7066 | tree purpose, value, chain; | |
7067 | ||
7068 | if (t == void_list_node) | |
7069 | return t; | |
7070 | ||
7071 | purpose = TREE_PURPOSE (t); | |
7072 | if (purpose) | |
4393e105 | 7073 | purpose = tsubst_copy (purpose, args, complain, in_decl); |
5566b478 MS |
7074 | value = TREE_VALUE (t); |
7075 | if (value) | |
4393e105 | 7076 | value = tsubst_copy (value, args, complain, in_decl); |
5566b478 MS |
7077 | chain = TREE_CHAIN (t); |
7078 | if (chain && chain != void_type_node) | |
4393e105 | 7079 | chain = tsubst_copy (chain, args, complain, in_decl); |
5566b478 MS |
7080 | if (purpose == TREE_PURPOSE (t) |
7081 | && value == TREE_VALUE (t) | |
7082 | && chain == TREE_CHAIN (t)) | |
7083 | return t; | |
7084 | return tree_cons (purpose, value, chain); | |
7085 | } | |
7086 | ||
7087 | case RECORD_TYPE: | |
7088 | case UNION_TYPE: | |
7089 | case ENUMERAL_TYPE: | |
7090 | case INTEGER_TYPE: | |
7091 | case TEMPLATE_TYPE_PARM: | |
73b0fce8 | 7092 | case TEMPLATE_TEMPLATE_PARM: |
a1281f45 | 7093 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
f84b4be9 | 7094 | case TEMPLATE_PARM_INDEX: |
5566b478 MS |
7095 | case POINTER_TYPE: |
7096 | case REFERENCE_TYPE: | |
7097 | case OFFSET_TYPE: | |
7098 | case FUNCTION_TYPE: | |
7099 | case METHOD_TYPE: | |
7100 | case ARRAY_TYPE: | |
7101 | case TYPENAME_TYPE: | |
f84b4be9 | 7102 | case TYPE_DECL: |
4393e105 | 7103 | return tsubst (t, args, complain, in_decl); |
5566b478 | 7104 | |
e92cc029 | 7105 | case IDENTIFIER_NODE: |
421844e7 | 7106 | if (IDENTIFIER_TYPENAME_P (t)) |
1f6e1acc AS |
7107 | { |
7108 | tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
669ec2b4 JM |
7109 | if (flag_new_abi) |
7110 | return mangle_conv_op_name_for_type (new_type); | |
7111 | else | |
7112 | return (build_typename_overload (new_type)); | |
1f6e1acc | 7113 | } |
e92cc029 MS |
7114 | else |
7115 | return t; | |
7116 | ||
5156628f | 7117 | case CONSTRUCTOR: |
8452b1d3 JM |
7118 | { |
7119 | r = build | |
4393e105 MM |
7120 | (CONSTRUCTOR, tsubst (TREE_TYPE (t), args, complain, in_decl), |
7121 | NULL_TREE, tsubst_copy (CONSTRUCTOR_ELTS (t), args, | |
7122 | complain, in_decl)); | |
8452b1d3 JM |
7123 | TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t); |
7124 | return r; | |
7125 | } | |
5156628f | 7126 | |
371534a9 | 7127 | case VA_ARG_EXPR: |
ea333e1c | 7128 | return build_x_va_arg (tsubst_copy (TREE_OPERAND (t, 0), args, complain, |
371534a9 MM |
7129 | in_decl), |
7130 | tsubst (TREE_TYPE (t), args, complain, in_decl)); | |
f9817201 MM |
7131 | |
7132 | case FUNCTION_NAME: | |
7133 | return tsubst (t, args, complain, in_decl); | |
7134 | ||
5566b478 MS |
7135 | default: |
7136 | return t; | |
7137 | } | |
7138 | } | |
7139 | ||
558475f0 | 7140 | /* Like tsubst_copy, but also does semantic processing. */ |
00d3396f | 7141 | |
5566b478 | 7142 | tree |
4393e105 | 7143 | tsubst_expr (t, args, complain, in_decl) |
98c1c668 | 7144 | tree t, args; |
4393e105 | 7145 | int complain; |
5566b478 MS |
7146 | tree in_decl; |
7147 | { | |
558475f0 MM |
7148 | tree stmt; |
7149 | ||
5566b478 MS |
7150 | if (t == NULL_TREE || t == error_mark_node) |
7151 | return t; | |
7152 | ||
5156628f | 7153 | if (processing_template_decl) |
4393e105 | 7154 | return tsubst_copy (t, args, complain, in_decl); |
5566b478 MS |
7155 | |
7156 | switch (TREE_CODE (t)) | |
8d08fdba | 7157 | { |
558475f0 | 7158 | case RETURN_INIT: |
a7e4cfa0 | 7159 | prep_stmt (t); |
558475f0 MM |
7160 | finish_named_return_value |
7161 | (TREE_OPERAND (t, 0), | |
7162 | tsubst_expr (TREE_OPERAND (t, 1), args, /*complain=*/1, in_decl)); | |
7163 | tsubst_expr (TREE_CHAIN (t), args, complain, in_decl); | |
7164 | break; | |
7165 | ||
7166 | case CTOR_INITIALIZER: | |
fd74ca0b MM |
7167 | { |
7168 | tree member_init_list; | |
7169 | tree base_init_list; | |
7170 | ||
7171 | prep_stmt (t); | |
7172 | member_init_list | |
7173 | = tsubst_initializer_list (TREE_OPERAND (t, 0), args); | |
7174 | base_init_list | |
7175 | = tsubst_initializer_list (TREE_OPERAND (t, 1), args); | |
7176 | setup_vtbl_ptr (member_init_list, base_init_list); | |
7177 | tsubst_expr (TREE_CHAIN (t), args, complain, in_decl); | |
7178 | break; | |
7179 | } | |
558475f0 | 7180 | |
5566b478 | 7181 | case RETURN_STMT: |
a7e4cfa0 | 7182 | prep_stmt (t); |
ad321293 | 7183 | finish_return_stmt (tsubst_expr (RETURN_EXPR (t), |
4393e105 | 7184 | args, complain, in_decl)); |
5566b478 MS |
7185 | break; |
7186 | ||
7187 | case EXPR_STMT: | |
a7e4cfa0 | 7188 | prep_stmt (t); |
ad321293 | 7189 | finish_expr_stmt (tsubst_expr (EXPR_STMT_EXPR (t), |
4393e105 | 7190 | args, complain, in_decl)); |
5566b478 MS |
7191 | break; |
7192 | ||
7193 | case DECL_STMT: | |
7194 | { | |
e0942dcd MM |
7195 | tree decl; |
7196 | tree init; | |
5566b478 | 7197 | |
a7e4cfa0 | 7198 | prep_stmt (t); |
e0942dcd | 7199 | decl = DECL_STMT_DECL (t); |
acef433b MM |
7200 | if (TREE_CODE (decl) == LABEL_DECL) |
7201 | finish_label_decl (DECL_NAME (decl)); | |
7202 | else | |
7203 | { | |
7204 | init = DECL_INITIAL (decl); | |
7205 | decl = tsubst (decl, args, complain, in_decl); | |
7206 | init = tsubst_expr (init, args, complain, in_decl); | |
ce2e5191 NS |
7207 | if (decl != error_mark_node) |
7208 | { | |
35728a80 NS |
7209 | if (TREE_CODE (decl) != TYPE_DECL) |
7210 | /* Make sure the type is instantiated now. */ | |
8b25cab9 | 7211 | complete_type (TREE_TYPE (decl)); |
ce2e5191 NS |
7212 | if (init) |
7213 | DECL_INITIAL (decl) = error_mark_node; | |
7214 | /* By marking the declaration as instantiated, we avoid | |
7215 | trying to instantiate it. Since instantiate_decl can't | |
7216 | handle local variables, and since we've already done | |
7217 | all that needs to be done, that's the right thing to | |
7218 | do. */ | |
7219 | if (TREE_CODE (decl) == VAR_DECL) | |
7220 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
7221 | maybe_push_decl (decl); | |
7222 | cp_finish_decl (decl, init, NULL_TREE, 0); | |
7223 | } | |
acef433b | 7224 | } |
e0942dcd | 7225 | return decl; |
5566b478 | 7226 | } |
8d08fdba | 7227 | |
5566b478 MS |
7228 | case FOR_STMT: |
7229 | { | |
7230 | tree tmp; | |
a7e4cfa0 | 7231 | prep_stmt (t); |
5566b478 | 7232 | |
558475f0 | 7233 | stmt = begin_for_stmt (); |
ad321293 | 7234 | for (tmp = FOR_INIT_STMT (t); tmp; tmp = TREE_CHAIN (tmp)) |
4393e105 | 7235 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7236 | finish_for_init_stmt (stmt); |
ad321293 | 7237 | finish_for_cond (tsubst_expr (FOR_COND (t), args, |
4393e105 | 7238 | complain, in_decl), |
558475f0 | 7239 | stmt); |
4393e105 | 7240 | tmp = tsubst_expr (FOR_EXPR (t), args, complain, in_decl); |
558475f0 | 7241 | finish_for_expr (tmp, stmt); |
4393e105 | 7242 | tsubst_expr (FOR_BODY (t), args, complain, in_decl); |
35b1567d | 7243 | finish_for_stmt (stmt); |
5566b478 MS |
7244 | } |
7245 | break; | |
8d08fdba | 7246 | |
5566b478 MS |
7247 | case WHILE_STMT: |
7248 | { | |
a7e4cfa0 | 7249 | prep_stmt (t); |
558475f0 | 7250 | stmt = begin_while_stmt (); |
ad321293 | 7251 | finish_while_stmt_cond (tsubst_expr (WHILE_COND (t), |
4393e105 | 7252 | args, complain, in_decl), |
558475f0 | 7253 | stmt); |
4393e105 | 7254 | tsubst_expr (WHILE_BODY (t), args, complain, in_decl); |
558475f0 | 7255 | finish_while_stmt (stmt); |
5566b478 MS |
7256 | } |
7257 | break; | |
8d08fdba | 7258 | |
5566b478 MS |
7259 | case DO_STMT: |
7260 | { | |
a7e4cfa0 | 7261 | prep_stmt (t); |
558475f0 | 7262 | stmt = begin_do_stmt (); |
4393e105 | 7263 | tsubst_expr (DO_BODY (t), args, complain, in_decl); |
558475f0 | 7264 | finish_do_body (stmt); |
ad321293 | 7265 | finish_do_stmt (tsubst_expr (DO_COND (t), args, |
4393e105 | 7266 | complain, in_decl), |
558475f0 | 7267 | stmt); |
5566b478 MS |
7268 | } |
7269 | break; | |
a0a33927 | 7270 | |
5566b478 | 7271 | case IF_STMT: |
8d08fdba | 7272 | { |
5566b478 | 7273 | tree tmp; |
5566b478 | 7274 | |
a7e4cfa0 | 7275 | prep_stmt (t); |
558475f0 | 7276 | stmt = begin_if_stmt (); |
ad321293 | 7277 | finish_if_stmt_cond (tsubst_expr (IF_COND (t), |
4393e105 | 7278 | args, complain, in_decl), |
558475f0 | 7279 | stmt); |
db5ae43f | 7280 | |
ad321293 | 7281 | if (tmp = THEN_CLAUSE (t), tmp) |
db5ae43f | 7282 | { |
4393e105 | 7283 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7284 | finish_then_clause (stmt); |
db5ae43f MS |
7285 | } |
7286 | ||
ad321293 MM |
7287 | if (tmp = ELSE_CLAUSE (t), tmp) |
7288 | { | |
7289 | begin_else_clause (); | |
4393e105 | 7290 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7291 | finish_else_clause (stmt); |
ad321293 | 7292 | } |
8d08fdba | 7293 | |
ad321293 | 7294 | finish_if_stmt (); |
8d08fdba | 7295 | } |
5566b478 | 7296 | break; |
8d08fdba | 7297 | |
5566b478 MS |
7298 | case COMPOUND_STMT: |
7299 | { | |
ad321293 | 7300 | tree substmt; |
8d08fdba | 7301 | |
a7e4cfa0 | 7302 | prep_stmt (t); |
558475f0 | 7303 | stmt = begin_compound_stmt (COMPOUND_STMT_NO_SCOPE (t)); |
ad321293 MM |
7304 | for (substmt = COMPOUND_BODY (t); |
7305 | substmt != NULL_TREE; | |
7306 | substmt = TREE_CHAIN (substmt)) | |
4393e105 | 7307 | tsubst_expr (substmt, args, complain, in_decl); |
558475f0 | 7308 | return finish_compound_stmt (COMPOUND_STMT_NO_SCOPE (t), stmt); |
5566b478 MS |
7309 | } |
7310 | break; | |
8d08fdba | 7311 | |
5566b478 | 7312 | case BREAK_STMT: |
a7e4cfa0 | 7313 | prep_stmt (t); |
ad321293 | 7314 | finish_break_stmt (); |
5566b478 | 7315 | break; |
8d08fdba | 7316 | |
6467930b | 7317 | case CONTINUE_STMT: |
a7e4cfa0 | 7318 | prep_stmt (t); |
ad321293 | 7319 | finish_continue_stmt (); |
6467930b MS |
7320 | break; |
7321 | ||
5566b478 MS |
7322 | case SWITCH_STMT: |
7323 | { | |
558475f0 | 7324 | tree val; |
5566b478 | 7325 | |
a7e4cfa0 | 7326 | prep_stmt (t); |
527f0080 | 7327 | stmt = begin_switch_stmt (); |
4393e105 | 7328 | val = tsubst_expr (SWITCH_COND (t), args, complain, in_decl); |
527f0080 | 7329 | finish_switch_cond (val, stmt); |
558475f0 | 7330 | tsubst_expr (SWITCH_BODY (t), args, complain, in_decl); |
35b1567d | 7331 | finish_switch_stmt (stmt); |
5566b478 MS |
7332 | } |
7333 | break; | |
7334 | ||
7335 | case CASE_LABEL: | |
a7e4cfa0 | 7336 | prep_stmt (t); |
4393e105 | 7337 | finish_case_label (tsubst_expr (CASE_LOW (t), args, complain, in_decl), |
56cb9733 MM |
7338 | tsubst_expr (CASE_HIGH (t), args, complain, |
7339 | in_decl)); | |
5566b478 MS |
7340 | break; |
7341 | ||
acef433b MM |
7342 | case LABEL_STMT: |
7343 | lineno = STMT_LINENO (t); | |
7344 | finish_label_stmt (DECL_NAME (LABEL_STMT_LABEL (t))); | |
5566b478 MS |
7345 | break; |
7346 | ||
7347 | case GOTO_STMT: | |
a7e4cfa0 | 7348 | prep_stmt (t); |
aa09da44 | 7349 | t = GOTO_DESTINATION (t); |
3fa56191 | 7350 | if (TREE_CODE (t) != LABEL_DECL) |
aa09da44 MM |
7351 | /* Computed goto's must be tsubst'd into. On the other hand, |
7352 | non-computed gotos must not be; the identifier in question | |
7353 | will have no binding. */ | |
4393e105 | 7354 | t = tsubst_expr (t, args, complain, in_decl); |
3fa56191 MM |
7355 | else |
7356 | t = DECL_NAME (t); | |
aa09da44 | 7357 | finish_goto_stmt (t); |
ad321293 MM |
7358 | break; |
7359 | ||
7360 | case ASM_STMT: | |
a7e4cfa0 | 7361 | prep_stmt (t); |
3ebc5c52 | 7362 | finish_asm_stmt (ASM_CV_QUAL (t), |
4393e105 MM |
7363 | tsubst_expr (ASM_STRING (t), args, complain, in_decl), |
7364 | tsubst_expr (ASM_OUTPUTS (t), args, complain, in_decl), | |
7365 | tsubst_expr (ASM_INPUTS (t), args, complain, in_decl), | |
7366 | tsubst_expr (ASM_CLOBBERS (t), args, complain, | |
7367 | in_decl)); | |
5566b478 | 7368 | break; |
faf5394a MS |
7369 | |
7370 | case TRY_BLOCK: | |
a7e4cfa0 | 7371 | prep_stmt (t); |
f1dedc31 | 7372 | if (CLEANUP_P (t)) |
62409b39 | 7373 | { |
57b52417 | 7374 | stmt = begin_try_block (); |
62409b39 MM |
7375 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); |
7376 | finish_cleanup_try_block (stmt); | |
7377 | finish_cleanup (tsubst_expr (TRY_HANDLERS (t), args, | |
7378 | complain, in_decl), | |
7379 | stmt); | |
7380 | } | |
f1dedc31 MM |
7381 | else |
7382 | { | |
62409b39 MM |
7383 | tree handler; |
7384 | ||
7385 | if (FN_TRY_BLOCK_P (t)) | |
7386 | stmt = begin_function_try_block (); | |
7387 | else | |
7388 | stmt = begin_try_block (); | |
7389 | ||
7390 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); | |
7391 | ||
7392 | if (FN_TRY_BLOCK_P (t)) | |
7393 | finish_function_try_block (stmt); | |
7394 | else | |
7395 | finish_try_block (stmt); | |
7396 | ||
7397 | handler = TRY_HANDLERS (t); | |
f1dedc31 MM |
7398 | for (; handler; handler = TREE_CHAIN (handler)) |
7399 | tsubst_expr (handler, args, complain, in_decl); | |
84df082b MM |
7400 | if (FN_TRY_BLOCK_P (t)) |
7401 | finish_function_handler_sequence (stmt); | |
7402 | else | |
7403 | finish_handler_sequence (stmt); | |
f1dedc31 | 7404 | } |
faf5394a | 7405 | break; |
b35d4555 | 7406 | |
faf5394a | 7407 | case HANDLER: |
b35d4555 MM |
7408 | { |
7409 | tree decl; | |
7410 | tree blocks; | |
7411 | ||
7412 | prep_stmt (t); | |
7413 | stmt = begin_handler (); | |
7414 | if (HANDLER_PARMS (t)) | |
7415 | { | |
7416 | decl = DECL_STMT_DECL (HANDLER_PARMS (t)); | |
7417 | decl = tsubst (decl, args, complain, in_decl); | |
f8191e64 MM |
7418 | /* Prevent instantiate_decl from trying to instantiate |
7419 | this variable. We've already done all that needs to be | |
7420 | done. */ | |
7421 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
b35d4555 MM |
7422 | } |
7423 | else | |
7424 | decl = NULL_TREE; | |
7425 | blocks = finish_handler_parms (decl, stmt); | |
7426 | tsubst_expr (HANDLER_BODY (t), args, complain, in_decl); | |
7427 | finish_handler (blocks, stmt); | |
7428 | } | |
faf5394a MS |
7429 | break; |
7430 | ||
b87692e5 | 7431 | case TAG_DEFN: |
a7e4cfa0 | 7432 | prep_stmt (t); |
b87692e5 | 7433 | t = TREE_TYPE (t); |
ae673f14 | 7434 | tsubst (t, args, complain, NULL_TREE); |
b87692e5 MS |
7435 | break; |
7436 | ||
5566b478 | 7437 | default: |
4393e105 | 7438 | return build_expr_from_tree (tsubst_copy (t, args, complain, in_decl)); |
5566b478 MS |
7439 | } |
7440 | return NULL_TREE; | |
8d08fdba MS |
7441 | } |
7442 | ||
db9b2174 MM |
7443 | /* TMPL is a TEMPLATE_DECL for a cloned constructor or destructor. |
7444 | Instantiate it with the ARGS. */ | |
7445 | ||
7446 | static tree | |
7447 | instantiate_clone (tmpl, args) | |
7448 | tree tmpl; | |
7449 | tree args; | |
7450 | { | |
7451 | tree spec; | |
7452 | tree clone; | |
7453 | ||
7454 | /* Instantiated the cloned function, rather than the clone. */ | |
7455 | spec = instantiate_template (DECL_CLONED_FUNCTION (tmpl), args); | |
7456 | ||
7457 | /* Then, see if we've already cloned the instantiation. */ | |
7458 | for (clone = TREE_CHAIN (spec); | |
7459 | clone && DECL_CLONED_FUNCTION_P (clone); | |
7460 | clone = TREE_CHAIN (clone)) | |
7461 | if (DECL_NAME (clone) == DECL_NAME (tmpl)) | |
7462 | return clone; | |
7463 | ||
7464 | /* If we haven't, do so know. */ | |
7465 | if (!clone) | |
7466 | clone_function_decl (spec, /*update_method_vec_p=*/0); | |
7467 | ||
7468 | /* Look again. */ | |
7469 | for (clone = TREE_CHAIN (spec); | |
7470 | clone && DECL_CLONED_FUNCTION_P (clone); | |
7471 | clone = TREE_CHAIN (clone)) | |
7472 | if (DECL_NAME (clone) == DECL_NAME (tmpl)) | |
7473 | return clone; | |
7474 | ||
7475 | /* We should always have found the clone by now. */ | |
7476 | my_friendly_abort (20000411); | |
7477 | return NULL_TREE; | |
7478 | } | |
7479 | ||
6ba89f8e | 7480 | /* Instantiate the indicated variable or function template TMPL with |
36a117a5 MM |
7481 | the template arguments in TARG_PTR. */ |
7482 | ||
5566b478 MS |
7483 | tree |
7484 | instantiate_template (tmpl, targ_ptr) | |
98c1c668 | 7485 | tree tmpl, targ_ptr; |
8d08fdba | 7486 | { |
94350948 | 7487 | tree clone; |
5566b478 | 7488 | tree fndecl; |
36a117a5 MM |
7489 | tree gen_tmpl; |
7490 | tree spec; | |
5566b478 | 7491 | int i, len; |
36a117a5 | 7492 | tree inner_args; |
5566b478 | 7493 | |
27fafc8d JM |
7494 | if (tmpl == error_mark_node) |
7495 | return error_mark_node; | |
7496 | ||
386b8a85 JM |
7497 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 283); |
7498 | ||
db9b2174 MM |
7499 | /* If this function is a clone, handle it specially. */ |
7500 | if (DECL_CLONED_FUNCTION_P (tmpl)) | |
7501 | return instantiate_clone (tmpl, targ_ptr); | |
7502 | ||
36a117a5 MM |
7503 | /* Check to see if we already have this specialization. */ |
7504 | spec = retrieve_specialization (tmpl, targ_ptr); | |
7505 | if (spec != NULL_TREE) | |
7506 | return spec; | |
7507 | ||
f9a7ae04 MM |
7508 | gen_tmpl = most_general_template (tmpl); |
7509 | if (tmpl != gen_tmpl) | |
386b8a85 | 7510 | { |
36a117a5 MM |
7511 | /* The TMPL is a partial instantiation. To get a full set of |
7512 | arguments we must add the arguments used to perform the | |
7513 | partial instantiation. */ | |
7514 | targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl), | |
7515 | targ_ptr); | |
36a117a5 MM |
7516 | |
7517 | /* Check to see if we already have this specialization. */ | |
7518 | spec = retrieve_specialization (gen_tmpl, targ_ptr); | |
75650646 MM |
7519 | if (spec != NULL_TREE) |
7520 | return spec; | |
386b8a85 JM |
7521 | } |
7522 | ||
36a117a5 | 7523 | len = DECL_NTPARMS (gen_tmpl); |
f9a7ae04 | 7524 | inner_args = INNERMOST_TEMPLATE_ARGS (targ_ptr); |
5566b478 MS |
7525 | i = len; |
7526 | while (i--) | |
8d08fdba | 7527 | { |
36a117a5 | 7528 | tree t = TREE_VEC_ELT (inner_args, i); |
2f939d94 | 7529 | if (TYPE_P (t)) |
5566b478 MS |
7530 | { |
7531 | tree nt = target_type (t); | |
ec255269 | 7532 | if (IS_AGGR_TYPE (nt) && decl_function_context (TYPE_MAIN_DECL (nt))) |
5566b478 | 7533 | { |
8251199e JM |
7534 | cp_error ("type `%T' composed from a local class is not a valid template-argument", t); |
7535 | cp_error (" trying to instantiate `%D'", gen_tmpl); | |
454fa7a7 | 7536 | return error_mark_node; |
5566b478 MS |
7537 | } |
7538 | } | |
8d08fdba MS |
7539 | } |
7540 | ||
5566b478 | 7541 | /* substitute template parameters */ |
17aec3eb RK |
7542 | fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl), |
7543 | targ_ptr, /*complain=*/1, gen_tmpl); | |
36a117a5 MM |
7544 | /* The DECL_TI_TEMPLATE should always be the immediate parent |
7545 | template, not the most general template. */ | |
7546 | DECL_TI_TEMPLATE (fndecl) = tmpl; | |
8d08fdba | 7547 | |
824b9a4c MS |
7548 | if (flag_external_templates) |
7549 | add_pending_template (fndecl); | |
7550 | ||
94350948 MM |
7551 | /* If we've just instantiated the main entry point for a function, |
7552 | instantiate all the alternate entry points as well. */ | |
7553 | for (clone = TREE_CHAIN (gen_tmpl); | |
7554 | clone && DECL_CLONED_FUNCTION_P (clone); | |
7555 | clone = TREE_CHAIN (clone)) | |
7556 | instantiate_template (clone, targ_ptr); | |
7557 | ||
5566b478 | 7558 | return fndecl; |
8d08fdba | 7559 | } |
5566b478 MS |
7560 | |
7561 | /* Push the name of the class template into the scope of the instantiation. */ | |
8d08fdba MS |
7562 | |
7563 | void | |
5566b478 MS |
7564 | overload_template_name (type) |
7565 | tree type; | |
8d08fdba | 7566 | { |
5566b478 MS |
7567 | tree id = DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)); |
7568 | tree decl; | |
8d08fdba | 7569 | |
5566b478 MS |
7570 | if (IDENTIFIER_CLASS_VALUE (id) |
7571 | && TREE_TYPE (IDENTIFIER_CLASS_VALUE (id)) == type) | |
7572 | return; | |
8d08fdba | 7573 | |
5566b478 | 7574 | decl = build_decl (TYPE_DECL, id, type); |
c727aa5e | 7575 | DECL_ARTIFICIAL (decl) = 1; |
5566b478 | 7576 | pushdecl_class_level (decl); |
8d08fdba MS |
7577 | } |
7578 | ||
4393e105 MM |
7579 | /* The FN is a TEMPLATE_DECL for a function. The ARGS are the |
7580 | arguments that are being used when calling it. TARGS is a vector | |
7581 | into which the deduced template arguments are placed. | |
8d08fdba MS |
7582 | |
7583 | Return zero for success, 2 for an incomplete match that doesn't resolve | |
7584 | all the types, and 1 for complete failure. An error message will be | |
7585 | printed only for an incomplete match. | |
7586 | ||
e5214479 JM |
7587 | If FN is a conversion operator, or we are trying to produce a specific |
7588 | specialization, RETURN_TYPE is the return type desired. | |
9f54c803 MM |
7589 | |
7590 | The EXPLICIT_TARGS are explicit template arguments provided via a | |
7591 | template-id. | |
6467930b | 7592 | |
830bfa74 MM |
7593 | The parameter STRICT is one of: |
7594 | ||
7595 | DEDUCE_CALL: | |
7596 | We are deducing arguments for a function call, as in | |
7597 | [temp.deduct.call]. | |
7598 | ||
7599 | DEDUCE_CONV: | |
7600 | We are deducing arguments for a conversion function, as in | |
7601 | [temp.deduct.conv]. | |
7602 | ||
7603 | DEDUCE_EXACT: | |
7604 | We are deducing arguments when calculating the partial | |
7605 | ordering between specializations of function or class | |
7606 | templates, as in [temp.func.order] and [temp.class.order], | |
7607 | when doing an explicit instantiation as in [temp.explicit], | |
9f54c803 | 7608 | when determining an explicit specialization as in |
830bfa74 | 7609 | [temp.expl.spec], or when taking the address of a function |
4393e105 MM |
7610 | template, as in [temp.deduct.funcaddr]. |
7611 | ||
e5214479 JM |
7612 | LEN is the number of parms to consider before returning success, or -1 |
7613 | for all. This is used in partial ordering to avoid comparing parms for | |
7614 | which no actual argument was passed, since they are not considered in | |
7615 | overload resolution (and are explicitly excluded from consideration in | |
7616 | partial ordering in [temp.func.order]/6). */ | |
8d08fdba MS |
7617 | |
7618 | int | |
4393e105 | 7619 | fn_type_unification (fn, explicit_targs, targs, args, return_type, |
e5214479 | 7620 | strict, len) |
4393e105 | 7621 | tree fn, explicit_targs, targs, args, return_type; |
830bfa74 | 7622 | unification_kind_t strict; |
e5214479 | 7623 | int len; |
386b8a85 | 7624 | { |
4393e105 MM |
7625 | tree parms; |
7626 | tree fntype; | |
adecb3f4 | 7627 | int result; |
386b8a85 | 7628 | |
4393e105 MM |
7629 | my_friendly_assert (TREE_CODE (fn) == TEMPLATE_DECL, 0); |
7630 | ||
7631 | fntype = TREE_TYPE (fn); | |
7632 | if (explicit_targs) | |
75650646 | 7633 | { |
4393e105 MM |
7634 | /* [temp.deduct] |
7635 | ||
7636 | The specified template arguments must match the template | |
7637 | parameters in kind (i.e., type, nontype, template), and there | |
7638 | must not be more arguments than there are parameters; | |
7639 | otherwise type deduction fails. | |
7640 | ||
7641 | Nontype arguments must match the types of the corresponding | |
7642 | nontype template parameters, or must be convertible to the | |
7643 | types of the corresponding nontype parameters as specified in | |
7644 | _temp.arg.nontype_, otherwise type deduction fails. | |
7645 | ||
7646 | All references in the function type of the function template | |
7647 | to the corresponding template parameters are replaced by the | |
7648 | specified template argument values. If a substitution in a | |
7649 | template parameter or in the function type of the function | |
7650 | template results in an invalid type, type deduction fails. */ | |
7651 | int i; | |
7652 | tree converted_args; | |
75650646 | 7653 | |
4393e105 MM |
7654 | converted_args |
7655 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn), | |
7656 | explicit_targs, NULL_TREE, /*complain=*/0, | |
7657 | /*require_all_arguments=*/0)); | |
7658 | if (converted_args == error_mark_node) | |
75650646 | 7659 | return 1; |
386b8a85 | 7660 | |
4393e105 MM |
7661 | fntype = tsubst (fntype, converted_args, /*complain=*/0, NULL_TREE); |
7662 | if (fntype == error_mark_node) | |
7663 | return 1; | |
050367a3 | 7664 | |
4393e105 MM |
7665 | /* Place the explicitly specified arguments in TARGS. */ |
7666 | for (i = 0; i < TREE_VEC_LENGTH (targs); i++) | |
7667 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (converted_args, i); | |
75650646 | 7668 | } |
4393e105 MM |
7669 | |
7670 | parms = TYPE_ARG_TYPES (fntype); | |
e5214479 JM |
7671 | /* Never do unification on the 'this' parameter. */ |
7672 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)) | |
7673 | parms = TREE_CHAIN (parms); | |
8d3631f8 NS |
7674 | |
7675 | if (return_type) | |
7676 | { | |
7677 | /* We've been given a return type to match, prepend it. */ | |
7678 | parms = tree_cons (NULL_TREE, TREE_TYPE (fntype), parms); | |
7679 | args = tree_cons (NULL_TREE, return_type, args); | |
16e42e7c JM |
7680 | if (len >= 0) |
7681 | ++len; | |
4393e105 MM |
7682 | } |
7683 | ||
4393e105 MM |
7684 | /* We allow incomplete unification without an error message here |
7685 | because the standard doesn't seem to explicitly prohibit it. Our | |
7686 | callers must be ready to deal with unification failures in any | |
7687 | event. */ | |
adecb3f4 MM |
7688 | result = type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn), |
7689 | targs, parms, args, /*subr=*/0, | |
e5214479 | 7690 | strict, /*allow_incomplete*/1, len); |
adecb3f4 MM |
7691 | |
7692 | if (result == 0) | |
7693 | /* All is well so far. Now, check: | |
7694 | ||
7695 | [temp.deduct] | |
7696 | ||
7697 | When all template arguments have been deduced, all uses of | |
7698 | template parameters in nondeduced contexts are replaced with | |
7699 | the corresponding deduced argument values. If the | |
7700 | substitution results in an invalid type, as described above, | |
7701 | type deduction fails. */ | |
7702 | if (tsubst (TREE_TYPE (fn), targs, /*complain=*/0, NULL_TREE) | |
7703 | == error_mark_node) | |
7704 | return 1; | |
7705 | ||
7706 | return result; | |
830bfa74 MM |
7707 | } |
7708 | ||
7709 | /* Adjust types before performing type deduction, as described in | |
7710 | [temp.deduct.call] and [temp.deduct.conv]. The rules in these two | |
4c7d0dff MM |
7711 | sections are symmetric. PARM is the type of a function parameter |
7712 | or the return type of the conversion function. ARG is the type of | |
7713 | the argument passed to the call, or the type of the value | |
dc957d14 | 7714 | initialized with the result of the conversion function. */ |
386b8a85 | 7715 | |
e9659ab0 | 7716 | static void |
830bfa74 MM |
7717 | maybe_adjust_types_for_deduction (strict, parm, arg) |
7718 | unification_kind_t strict; | |
7719 | tree* parm; | |
7720 | tree* arg; | |
7721 | { | |
7722 | switch (strict) | |
7723 | { | |
7724 | case DEDUCE_CALL: | |
7725 | break; | |
7726 | ||
7727 | case DEDUCE_CONV: | |
7728 | { | |
4c7d0dff MM |
7729 | /* Swap PARM and ARG throughout the remainder of this |
7730 | function; the handling is precisely symmetric since PARM | |
7731 | will initialize ARG rather than vice versa. */ | |
830bfa74 MM |
7732 | tree* temp = parm; |
7733 | parm = arg; | |
7734 | arg = temp; | |
7735 | break; | |
7736 | } | |
7737 | ||
7738 | case DEDUCE_EXACT: | |
7739 | /* There is nothing to do in this case. */ | |
7740 | return; | |
7741 | ||
7742 | default: | |
7743 | my_friendly_abort (0); | |
7744 | } | |
7745 | ||
7746 | if (TREE_CODE (*parm) != REFERENCE_TYPE) | |
7747 | { | |
7748 | /* [temp.deduct.call] | |
7749 | ||
7750 | If P is not a reference type: | |
7751 | ||
7752 | --If A is an array type, the pointer type produced by the | |
7753 | array-to-pointer standard conversion (_conv.array_) is | |
7754 | used in place of A for type deduction; otherwise, | |
7755 | ||
7756 | --If A is a function type, the pointer type produced by | |
7757 | the function-to-pointer standard conversion | |
7758 | (_conv.func_) is used in place of A for type deduction; | |
7759 | otherwise, | |
7760 | ||
7761 | --If A is a cv-qualified type, the top level | |
7762 | cv-qualifiers of A's type are ignored for type | |
7763 | deduction. */ | |
7764 | if (TREE_CODE (*arg) == ARRAY_TYPE) | |
7765 | *arg = build_pointer_type (TREE_TYPE (*arg)); | |
d8f8dca1 | 7766 | else if (TREE_CODE (*arg) == FUNCTION_TYPE) |
830bfa74 MM |
7767 | *arg = build_pointer_type (*arg); |
7768 | else | |
7769 | *arg = TYPE_MAIN_VARIANT (*arg); | |
7770 | } | |
7771 | ||
7772 | /* [temp.deduct.call] | |
7773 | ||
7774 | If P is a cv-qualified type, the top level cv-qualifiers | |
7775 | of P's type are ignored for type deduction. If P is a | |
7776 | reference type, the type referred to by P is used for | |
7777 | type deduction. */ | |
7778 | *parm = TYPE_MAIN_VARIANT (*parm); | |
7779 | if (TREE_CODE (*parm) == REFERENCE_TYPE) | |
7780 | *parm = TREE_TYPE (*parm); | |
386b8a85 JM |
7781 | } |
7782 | ||
e5214479 | 7783 | /* Most parms like fn_type_unification. |
9f54c803 MM |
7784 | |
7785 | If SUBR is 1, we're being called recursively (to unify the | |
7786 | arguments of a function or method parameter of a function | |
7787 | template). */ | |
386b8a85 | 7788 | |
4966381a | 7789 | static int |
3b3ba9f0 | 7790 | type_unification_real (tparms, targs, parms, args, subr, |
e5214479 | 7791 | strict, allow_incomplete, len) |
050367a3 | 7792 | tree tparms, targs, parms, args; |
830bfa74 MM |
7793 | int subr; |
7794 | unification_kind_t strict; | |
e5214479 | 7795 | int allow_incomplete, len; |
8d08fdba MS |
7796 | { |
7797 | tree parm, arg; | |
7798 | int i; | |
7799 | int ntparms = TREE_VEC_LENGTH (tparms); | |
830bfa74 | 7800 | int sub_strict; |
8d08fdba MS |
7801 | |
7802 | my_friendly_assert (TREE_CODE (tparms) == TREE_VEC, 289); | |
386b8a85 JM |
7803 | my_friendly_assert (parms == NULL_TREE |
7804 | || TREE_CODE (parms) == TREE_LIST, 290); | |
51c184be | 7805 | /* ARGS could be NULL (via a call from parse.y to |
8d08fdba MS |
7806 | build_x_function_call). */ |
7807 | if (args) | |
7808 | my_friendly_assert (TREE_CODE (args) == TREE_LIST, 291); | |
7809 | my_friendly_assert (ntparms > 0, 292); | |
7810 | ||
830bfa74 MM |
7811 | switch (strict) |
7812 | { | |
7813 | case DEDUCE_CALL: | |
7814 | sub_strict = UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_DERIVED; | |
7815 | break; | |
7816 | ||
7817 | case DEDUCE_CONV: | |
7818 | sub_strict = UNIFY_ALLOW_LESS_CV_QUAL; | |
7819 | break; | |
7820 | ||
7821 | case DEDUCE_EXACT: | |
7822 | sub_strict = UNIFY_ALLOW_NONE; | |
7823 | break; | |
7824 | ||
7825 | default: | |
7826 | my_friendly_abort (0); | |
7827 | } | |
7828 | ||
e5214479 JM |
7829 | if (len == 0) |
7830 | return 0; | |
7831 | ||
8d08fdba MS |
7832 | while (parms |
7833 | && parms != void_list_node | |
7834 | && args | |
7835 | && args != void_list_node) | |
7836 | { | |
7837 | parm = TREE_VALUE (parms); | |
7838 | parms = TREE_CHAIN (parms); | |
7839 | arg = TREE_VALUE (args); | |
7840 | args = TREE_CHAIN (args); | |
7841 | ||
7842 | if (arg == error_mark_node) | |
7843 | return 1; | |
7844 | if (arg == unknown_type_node) | |
34016c81 JM |
7845 | /* We can't deduce anything from this, but we might get all the |
7846 | template args from other function args. */ | |
7847 | continue; | |
b7484fbe | 7848 | |
03e70705 JM |
7849 | /* Conversions will be performed on a function argument that |
7850 | corresponds with a function parameter that contains only | |
7851 | non-deducible template parameters and explicitly specified | |
7852 | template parameters. */ | |
7853 | if (! uses_template_parms (parm)) | |
b7484fbe | 7854 | { |
03e70705 JM |
7855 | tree type; |
7856 | ||
2f939d94 | 7857 | if (!TYPE_P (arg)) |
03e70705 JM |
7858 | type = TREE_TYPE (arg); |
7859 | else | |
7860 | { | |
7861 | type = arg; | |
7862 | arg = NULL_TREE; | |
7863 | } | |
7864 | ||
830bfa74 | 7865 | if (strict == DEDUCE_EXACT) |
03e70705 | 7866 | { |
3bfdc719 | 7867 | if (same_type_p (parm, type)) |
03e70705 JM |
7868 | continue; |
7869 | } | |
03e70705 | 7870 | else |
343c89cd JM |
7871 | /* It might work; we shouldn't check now, because we might |
7872 | get into infinite recursion. Overload resolution will | |
7873 | handle it. */ | |
7874 | continue; | |
03e70705 | 7875 | |
b7484fbe MS |
7876 | return 1; |
7877 | } | |
7878 | ||
2f939d94 | 7879 | if (!TYPE_P (arg)) |
8d08fdba MS |
7880 | { |
7881 | my_friendly_assert (TREE_TYPE (arg) != NULL_TREE, 293); | |
34016c81 | 7882 | if (type_unknown_p (arg)) |
28cbf42c | 7883 | { |
34016c81 JM |
7884 | /* [temp.deduct.type] A template-argument can be deduced from |
7885 | a pointer to function or pointer to member function | |
7886 | argument if the set of overloaded functions does not | |
7887 | contain function templates and at most one of a set of | |
7888 | overloaded functions provides a unique match. */ | |
7889 | ||
7890 | if (resolve_overloaded_unification | |
4393e105 | 7891 | (tparms, targs, parm, arg, strict, sub_strict) |
34016c81 JM |
7892 | != 0) |
7893 | return 1; | |
7894 | continue; | |
28cbf42c | 7895 | } |
8d08fdba MS |
7896 | arg = TREE_TYPE (arg); |
7897 | } | |
4393e105 | 7898 | |
830bfa74 MM |
7899 | if (!subr) |
7900 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
db5ae43f | 7901 | |
d7c4edd0 NS |
7902 | if (unify (tparms, targs, parm, arg, sub_strict)) |
7903 | return 1; | |
e5214479 JM |
7904 | |
7905 | /* Are we done with the interesting parms? */ | |
7906 | if (--len == 0) | |
7907 | return 0; | |
8d08fdba MS |
7908 | } |
7909 | /* Fail if we've reached the end of the parm list, and more args | |
7910 | are present, and the parm list isn't variadic. */ | |
7911 | if (args && args != void_list_node && parms == void_list_node) | |
7912 | return 1; | |
7913 | /* Fail if parms are left and they don't have default values. */ | |
7914 | if (parms | |
7915 | && parms != void_list_node | |
7916 | && TREE_PURPOSE (parms) == NULL_TREE) | |
7917 | return 1; | |
7918 | if (!subr) | |
7919 | for (i = 0; i < ntparms; i++) | |
050367a3 | 7920 | if (TREE_VEC_ELT (targs, i) == NULL_TREE) |
8d08fdba | 7921 | { |
386b8a85 | 7922 | if (!allow_incomplete) |
8251199e | 7923 | error ("incomplete type unification"); |
8d08fdba MS |
7924 | return 2; |
7925 | } | |
7926 | return 0; | |
7927 | } | |
7928 | ||
34016c81 JM |
7929 | /* Subroutine of type_unification_real. Args are like the variables at the |
7930 | call site. ARG is an overloaded function (or template-id); we try | |
7931 | deducing template args from each of the overloads, and if only one | |
7932 | succeeds, we go with that. Modifies TARGS and returns 0 on success. */ | |
7933 | ||
7934 | static int | |
7935 | resolve_overloaded_unification (tparms, targs, parm, arg, strict, | |
4393e105 | 7936 | sub_strict) |
34016c81 JM |
7937 | tree tparms, targs, parm, arg; |
7938 | unification_kind_t strict; | |
7939 | int sub_strict; | |
34016c81 JM |
7940 | { |
7941 | tree tempargs = copy_node (targs); | |
7942 | int good = 0; | |
7943 | ||
7944 | if (TREE_CODE (arg) == ADDR_EXPR) | |
7945 | arg = TREE_OPERAND (arg, 0); | |
9f3d9e46 | 7946 | |
d8f8dca1 MM |
7947 | if (TREE_CODE (arg) == COMPONENT_REF) |
7948 | /* Handle `&x' where `x' is some static or non-static member | |
7949 | function name. */ | |
7950 | arg = TREE_OPERAND (arg, 1); | |
7951 | ||
05e0b2f4 JM |
7952 | if (TREE_CODE (arg) == OFFSET_REF) |
7953 | arg = TREE_OPERAND (arg, 1); | |
7954 | ||
9f3d9e46 JM |
7955 | /* Strip baselink information. */ |
7956 | while (TREE_CODE (arg) == TREE_LIST) | |
7957 | arg = TREE_VALUE (arg); | |
7958 | ||
34016c81 JM |
7959 | if (TREE_CODE (arg) == TEMPLATE_ID_EXPR) |
7960 | { | |
7961 | /* If we got some explicit template args, we need to plug them into | |
7962 | the affected templates before we try to unify, in case the | |
7963 | explicit args will completely resolve the templates in question. */ | |
7964 | ||
7965 | tree expl_subargs = TREE_OPERAND (arg, 1); | |
7966 | arg = TREE_OPERAND (arg, 0); | |
7967 | ||
7968 | for (; arg; arg = OVL_NEXT (arg)) | |
7969 | { | |
7970 | tree fn = OVL_CURRENT (arg); | |
7971 | tree subargs, elem; | |
7972 | ||
7973 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
7974 | continue; | |
7975 | ||
17aec3eb RK |
7976 | subargs = get_bindings_overload (fn, DECL_TEMPLATE_RESULT (fn), |
7977 | expl_subargs); | |
34016c81 JM |
7978 | if (subargs) |
7979 | { | |
4393e105 MM |
7980 | elem = tsubst (TREE_TYPE (fn), subargs, /*complain=*/0, |
7981 | NULL_TREE); | |
d8f8dca1 MM |
7982 | if (TREE_CODE (elem) == METHOD_TYPE) |
7983 | elem = build_ptrmemfunc_type (build_pointer_type (elem)); | |
e97e5263 | 7984 | good += try_one_overload (tparms, targs, tempargs, parm, elem, |
4393e105 | 7985 | strict, sub_strict); |
34016c81 JM |
7986 | } |
7987 | } | |
7988 | } | |
7989 | else if (TREE_CODE (arg) == OVERLOAD) | |
7990 | { | |
7991 | for (; arg; arg = OVL_NEXT (arg)) | |
d8f8dca1 MM |
7992 | { |
7993 | tree type = TREE_TYPE (OVL_CURRENT (arg)); | |
7994 | if (TREE_CODE (type) == METHOD_TYPE) | |
7995 | type = build_ptrmemfunc_type (build_pointer_type (type)); | |
7996 | good += try_one_overload (tparms, targs, tempargs, parm, | |
7997 | type, | |
4393e105 | 7998 | strict, sub_strict); |
d8f8dca1 | 7999 | } |
34016c81 JM |
8000 | } |
8001 | else | |
8002 | my_friendly_abort (981006); | |
8003 | ||
8004 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
8005 | to function or pointer to member function argument if the set of | |
8006 | overloaded functions does not contain function templates and at most | |
8007 | one of a set of overloaded functions provides a unique match. | |
8008 | ||
8009 | So if we found multiple possibilities, we return success but don't | |
8010 | deduce anything. */ | |
8011 | ||
8012 | if (good == 1) | |
8013 | { | |
8014 | int i = TREE_VEC_LENGTH (targs); | |
8015 | for (; i--; ) | |
8016 | if (TREE_VEC_ELT (tempargs, i)) | |
8017 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i); | |
8018 | } | |
8019 | if (good) | |
8020 | return 0; | |
8021 | ||
8022 | return 1; | |
8023 | } | |
8024 | ||
8025 | /* Subroutine of resolve_overloaded_unification; does deduction for a single | |
8026 | overload. Fills TARGS with any deduced arguments, or error_mark_node if | |
8027 | different overloads deduce different arguments for a given parm. | |
8028 | Returns 1 on success. */ | |
8029 | ||
8030 | static int | |
e97e5263 | 8031 | try_one_overload (tparms, orig_targs, targs, parm, arg, strict, |
4393e105 | 8032 | sub_strict) |
e97e5263 | 8033 | tree tparms, orig_targs, targs, parm, arg; |
34016c81 JM |
8034 | unification_kind_t strict; |
8035 | int sub_strict; | |
34016c81 JM |
8036 | { |
8037 | int nargs; | |
8038 | tree tempargs; | |
8039 | int i; | |
8040 | ||
8041 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
8042 | to function or pointer to member function argument if the set of | |
8043 | overloaded functions does not contain function templates and at most | |
8044 | one of a set of overloaded functions provides a unique match. | |
8045 | ||
8046 | So if this is a template, just return success. */ | |
8047 | ||
8048 | if (uses_template_parms (arg)) | |
8049 | return 1; | |
8050 | ||
8051 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
8052 | ||
8053 | /* We don't copy orig_targs for this because if we have already deduced | |
8054 | some template args from previous args, unify would complain when we | |
8055 | try to deduce a template parameter for the same argument, even though | |
8056 | there isn't really a conflict. */ | |
8057 | nargs = TREE_VEC_LENGTH (targs); | |
f31c0a32 | 8058 | tempargs = make_tree_vec (nargs); |
34016c81 | 8059 | |
4393e105 | 8060 | if (unify (tparms, tempargs, parm, arg, sub_strict) != 0) |
34016c81 JM |
8061 | return 0; |
8062 | ||
8063 | /* First make sure we didn't deduce anything that conflicts with | |
e97e5263 | 8064 | explicitly specified args. */ |
34016c81 JM |
8065 | for (i = nargs; i--; ) |
8066 | { | |
8067 | tree elt = TREE_VEC_ELT (tempargs, i); | |
e97e5263 | 8068 | tree oldelt = TREE_VEC_ELT (orig_targs, i); |
34016c81 JM |
8069 | |
8070 | if (elt == NULL_TREE) | |
8071 | continue; | |
8072 | else if (uses_template_parms (elt)) | |
8073 | { | |
8074 | /* Since we're unifying against ourselves, we will fill in template | |
8075 | args used in the function parm list with our own template parms. | |
8076 | Discard them. */ | |
8077 | TREE_VEC_ELT (tempargs, i) = NULL_TREE; | |
8078 | continue; | |
8079 | } | |
8080 | else if (oldelt && ! template_args_equal (oldelt, elt)) | |
8081 | return 0; | |
8082 | } | |
8083 | ||
8084 | for (i = nargs; i--; ) | |
8085 | { | |
8086 | tree elt = TREE_VEC_ELT (tempargs, i); | |
8087 | ||
8088 | if (elt) | |
8089 | TREE_VEC_ELT (targs, i) = elt; | |
8090 | } | |
8091 | ||
8092 | return 1; | |
8093 | } | |
8094 | ||
74601d7c KL |
8095 | /* Verify that nondeduce template argument agrees with the type |
8096 | obtained from argument deduction. Return nonzero if the | |
8097 | verification fails. | |
8098 | ||
8099 | For example: | |
8100 | ||
8101 | struct A { typedef int X; }; | |
8102 | template <class T, class U> struct C {}; | |
8103 | template <class T> struct C<T, typename T::X> {}; | |
8104 | ||
8105 | Then with the instantiation `C<A, int>', we can deduce that | |
8106 | `T' is `A' but unify () does not check whether `typename T::X' | |
8107 | is `int'. This function ensure that they agree. | |
8108 | ||
8109 | TARGS, PARMS are the same as the arguments of unify. | |
8110 | ARGS contains template arguments from all levels. */ | |
8111 | ||
8112 | static int | |
8113 | verify_class_unification (targs, parms, args) | |
8114 | tree targs, parms, args; | |
8115 | { | |
8116 | int i; | |
8117 | int nparms = TREE_VEC_LENGTH (parms); | |
8118 | tree new_parms = tsubst (parms, add_outermost_template_args (args, targs), | |
8119 | /*complain=*/0, NULL_TREE); | |
8120 | if (new_parms == error_mark_node) | |
8121 | return 1; | |
8122 | ||
8123 | args = INNERMOST_TEMPLATE_ARGS (args); | |
8124 | ||
8125 | for (i = 0; i < nparms; i++) | |
8126 | { | |
8127 | tree parm = TREE_VEC_ELT (new_parms, i); | |
8128 | tree arg = TREE_VEC_ELT (args, i); | |
8129 | ||
8130 | /* In case we are deducing from a function argument of a function | |
8131 | templates, some parameters may not be deduced yet. So we | |
8132 | make sure that only fully substituted elements of PARM are | |
8133 | compared below. */ | |
8134 | ||
8135 | if (!uses_template_parms (parm) && !template_args_equal (parm, arg)) | |
8136 | return 1; | |
8137 | } | |
8138 | return 0; | |
8139 | } | |
8140 | ||
4393e105 MM |
8141 | /* PARM is a template class (perhaps with unbound template |
8142 | parameters). ARG is a fully instantiated type. If ARG can be | |
8143 | bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and | |
8144 | TARGS are as for unify. */ | |
fcfb9f96 MM |
8145 | |
8146 | static tree | |
4393e105 | 8147 | try_class_unification (tparms, targs, parm, arg) |
fcfb9f96 MM |
8148 | tree tparms; |
8149 | tree targs; | |
4393e105 MM |
8150 | tree parm; |
8151 | tree arg; | |
8152 | { | |
4393e105 MM |
8153 | tree copy_of_targs; |
8154 | ||
8155 | if (!CLASSTYPE_TEMPLATE_INFO (arg) | |
8156 | || CLASSTYPE_TI_TEMPLATE (arg) != CLASSTYPE_TI_TEMPLATE (parm)) | |
8157 | return NULL_TREE; | |
8158 | ||
8159 | /* We need to make a new template argument vector for the call to | |
8160 | unify. If we used TARGS, we'd clutter it up with the result of | |
8161 | the attempted unification, even if this class didn't work out. | |
8162 | We also don't want to commit ourselves to all the unifications | |
8163 | we've already done, since unification is supposed to be done on | |
8164 | an argument-by-argument basis. In other words, consider the | |
8165 | following pathological case: | |
8166 | ||
8167 | template <int I, int J, int K> | |
8168 | struct S {}; | |
8169 | ||
8170 | template <int I, int J> | |
8171 | struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {}; | |
8172 | ||
8173 | template <int I, int J, int K> | |
8174 | void f(S<I, J, K>, S<I, I, I>); | |
8175 | ||
8176 | void g() { | |
8177 | S<0, 0, 0> s0; | |
8178 | S<0, 1, 2> s2; | |
8179 | ||
8180 | f(s0, s2); | |
8181 | } | |
8182 | ||
8183 | Now, by the time we consider the unification involving `s2', we | |
8184 | already know that we must have `f<0, 0, 0>'. But, even though | |
8185 | `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is not legal | |
8186 | because there are two ways to unify base classes of S<0, 1, 2> | |
8187 | with S<I, I, I>. If we kept the already deduced knowledge, we | |
8188 | would reject the possibility I=1. */ | |
f31c0a32 | 8189 | copy_of_targs = make_tree_vec (TREE_VEC_LENGTH (targs)); |
4393e105 MM |
8190 | |
8191 | /* If unification failed, we're done. */ | |
74601d7c KL |
8192 | if (unify (tparms, copy_of_targs, CLASSTYPE_TI_ARGS (parm), |
8193 | CLASSTYPE_TI_ARGS (arg), UNIFY_ALLOW_NONE)) | |
4393e105 | 8194 | return NULL_TREE; |
74601d7c KL |
8195 | |
8196 | return arg; | |
4393e105 MM |
8197 | } |
8198 | ||
8199 | /* Subroutine of get_template_base. RVAL, if non-NULL, is a base we | |
dc957d14 | 8200 | have already discovered to be satisfactory. ARG_BINFO is the binfo |
4393e105 MM |
8201 | for the base class of ARG that we are currently examining. */ |
8202 | ||
8203 | static tree | |
8204 | get_template_base_recursive (tparms, targs, parm, | |
8205 | arg_binfo, rval, flags) | |
8206 | tree tparms; | |
8207 | tree targs; | |
8208 | tree arg_binfo; | |
fcfb9f96 | 8209 | tree rval; |
4393e105 MM |
8210 | tree parm; |
8211 | int flags; | |
fcfb9f96 MM |
8212 | { |
8213 | tree binfos; | |
8214 | int i, n_baselinks; | |
4393e105 | 8215 | tree arg = BINFO_TYPE (arg_binfo); |
fcfb9f96 | 8216 | |
4393e105 | 8217 | if (!(flags & GTB_IGNORE_TYPE)) |
fcfb9f96 | 8218 | { |
4393e105 MM |
8219 | tree r = try_class_unification (tparms, targs, |
8220 | parm, arg); | |
fcfb9f96 | 8221 | |
4393e105 | 8222 | /* If there is more than one satisfactory baseclass, then: |
fcfb9f96 | 8223 | |
4393e105 MM |
8224 | [temp.deduct.call] |
8225 | ||
8226 | If they yield more than one possible deduced A, the type | |
8227 | deduction fails. | |
8228 | ||
8229 | applies. */ | |
8230 | if (r && rval && !same_type_p (r, rval)) | |
8231 | return error_mark_node; | |
8232 | else if (r) | |
8233 | rval = r; | |
fcfb9f96 MM |
8234 | } |
8235 | ||
4393e105 | 8236 | binfos = BINFO_BASETYPES (arg_binfo); |
fcfb9f96 MM |
8237 | n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; |
8238 | ||
8239 | /* Process base types. */ | |
8240 | for (i = 0; i < n_baselinks; i++) | |
8241 | { | |
8242 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
4393e105 | 8243 | int this_virtual; |
fcfb9f96 | 8244 | |
4393e105 MM |
8245 | /* Skip this base, if we've already seen it. */ |
8246 | if (BINFO_MARKED (base_binfo)) | |
8247 | continue; | |
8248 | ||
8249 | this_virtual = | |
8250 | (flags & GTB_VIA_VIRTUAL) || TREE_VIA_VIRTUAL (base_binfo); | |
8251 | ||
8252 | /* When searching for a non-virtual, we cannot mark virtually | |
8253 | found binfos. */ | |
8254 | if (! this_virtual) | |
8255 | SET_BINFO_MARKED (base_binfo); | |
8256 | ||
8257 | rval = get_template_base_recursive (tparms, targs, | |
8258 | parm, | |
8259 | base_binfo, | |
8260 | rval, | |
8261 | GTB_VIA_VIRTUAL * this_virtual); | |
8262 | ||
8263 | /* If we discovered more than one matching base class, we can | |
8264 | stop now. */ | |
8265 | if (rval == error_mark_node) | |
8266 | return error_mark_node; | |
fcfb9f96 MM |
8267 | } |
8268 | ||
8269 | return rval; | |
8270 | } | |
8271 | ||
4393e105 MM |
8272 | /* Given a template type PARM and a class type ARG, find the unique |
8273 | base type in ARG that is an instance of PARM. We do not examine | |
8274 | ARG itself; only its base-classes. If there is no appropriate base | |
8275 | class, return NULL_TREE. If there is more than one, return | |
8276 | error_mark_node. PARM may be the type of a partial specialization, | |
8277 | as well as a plain template type. Used by unify. */ | |
fcfb9f96 MM |
8278 | |
8279 | static tree | |
4393e105 | 8280 | get_template_base (tparms, targs, parm, arg) |
fcfb9f96 MM |
8281 | tree tparms; |
8282 | tree targs; | |
4393e105 MM |
8283 | tree parm; |
8284 | tree arg; | |
fcfb9f96 | 8285 | { |
4393e105 MM |
8286 | tree rval; |
8287 | tree arg_binfo; | |
fcfb9f96 | 8288 | |
4393e105 MM |
8289 | my_friendly_assert (IS_AGGR_TYPE_CODE (TREE_CODE (arg)), 92); |
8290 | ||
8291 | arg_binfo = TYPE_BINFO (complete_type (arg)); | |
8292 | rval = get_template_base_recursive (tparms, targs, | |
8293 | parm, arg_binfo, | |
8294 | NULL_TREE, | |
8295 | GTB_IGNORE_TYPE); | |
fcfb9f96 | 8296 | |
4393e105 MM |
8297 | /* Since get_template_base_recursive marks the bases classes, we |
8298 | must unmark them here. */ | |
d6479fe7 | 8299 | dfs_walk (arg_binfo, dfs_unmark, markedp, 0); |
fcfb9f96 MM |
8300 | |
8301 | return rval; | |
8302 | } | |
8303 | ||
db2767b6 MM |
8304 | /* Returns the level of DECL, which declares a template parameter. */ |
8305 | ||
e9659ab0 | 8306 | static int |
db2767b6 MM |
8307 | template_decl_level (decl) |
8308 | tree decl; | |
8309 | { | |
8310 | switch (TREE_CODE (decl)) | |
8311 | { | |
8312 | case TYPE_DECL: | |
8313 | case TEMPLATE_DECL: | |
8314 | return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl)); | |
8315 | ||
8316 | case PARM_DECL: | |
8317 | return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl)); | |
8318 | ||
8319 | default: | |
8320 | my_friendly_abort (0); | |
5ffe581d | 8321 | return 0; |
db2767b6 MM |
8322 | } |
8323 | } | |
8324 | ||
830bfa74 MM |
8325 | /* Decide whether ARG can be unified with PARM, considering only the |
8326 | cv-qualifiers of each type, given STRICT as documented for unify. | |
8327 | Returns non-zero iff the unification is OK on that basis.*/ | |
e92cc029 | 8328 | |
e9659ab0 | 8329 | static int |
830bfa74 MM |
8330 | check_cv_quals_for_unify (strict, arg, parm) |
8331 | int strict; | |
8332 | tree arg; | |
8333 | tree parm; | |
8334 | { | |
ef637255 MM |
8335 | if (!(strict & UNIFY_ALLOW_MORE_CV_QUAL) |
8336 | && !at_least_as_qualified_p (arg, parm)) | |
8337 | return 0; | |
8338 | ||
8339 | if (!(strict & UNIFY_ALLOW_LESS_CV_QUAL) | |
8340 | && !at_least_as_qualified_p (parm, arg)) | |
8341 | return 0; | |
8342 | ||
ef637255 | 8343 | return 1; |
830bfa74 MM |
8344 | } |
8345 | ||
8346 | /* Takes parameters as for type_unification. Returns 0 if the | |
dc957d14 | 8347 | type deduction succeeds, 1 otherwise. The parameter STRICT is a |
830bfa74 MM |
8348 | bitwise or of the following flags: |
8349 | ||
8350 | UNIFY_ALLOW_NONE: | |
8351 | Require an exact match between PARM and ARG. | |
8352 | UNIFY_ALLOW_MORE_CV_QUAL: | |
8353 | Allow the deduced ARG to be more cv-qualified than ARG. | |
8354 | UNIFY_ALLOW_LESS_CV_QUAL: | |
8355 | Allow the deduced ARG to be less cv-qualified than ARG. | |
8356 | UNIFY_ALLOW_DERIVED: | |
8357 | Allow the deduced ARG to be a template base class of ARG, | |
8358 | or a pointer to a template base class of the type pointed to by | |
161c12b0 JM |
8359 | ARG. |
8360 | UNIFY_ALLOW_INTEGER: | |
8361 | Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX | |
8362 | case for more information. */ | |
830bfa74 | 8363 | |
e9659ab0 | 8364 | static int |
4393e105 | 8365 | unify (tparms, targs, parm, arg, strict) |
050367a3 | 8366 | tree tparms, targs, parm, arg; |
830bfa74 | 8367 | int strict; |
8d08fdba MS |
8368 | { |
8369 | int idx; | |
050367a3 | 8370 | tree targ; |
db2767b6 | 8371 | tree tparm; |
8d08fdba MS |
8372 | |
8373 | /* I don't think this will do the right thing with respect to types. | |
8374 | But the only case I've seen it in so far has been array bounds, where | |
8375 | signedness is the only information lost, and I think that will be | |
8376 | okay. */ | |
8377 | while (TREE_CODE (parm) == NOP_EXPR) | |
8378 | parm = TREE_OPERAND (parm, 0); | |
8379 | ||
8380 | if (arg == error_mark_node) | |
8381 | return 1; | |
8382 | if (arg == unknown_type_node) | |
34016c81 JM |
8383 | /* We can't deduce anything from this, but we might get all the |
8384 | template args from other function args. */ | |
8385 | return 0; | |
8386 | ||
db2767b6 | 8387 | /* If PARM uses template parameters, then we can't bail out here, |
6bdb985f | 8388 | even if ARG == PARM, since we won't record unifications for the |
db2767b6 MM |
8389 | template parameters. We might need them if we're trying to |
8390 | figure out which of two things is more specialized. */ | |
8391 | if (arg == parm && !uses_template_parms (parm)) | |
8d08fdba MS |
8392 | return 0; |
8393 | ||
830bfa74 MM |
8394 | /* Immediately reject some pairs that won't unify because of |
8395 | cv-qualification mismatches. */ | |
8396 | if (TREE_CODE (arg) == TREE_CODE (parm) | |
2f939d94 | 8397 | && TYPE_P (arg) |
830bfa74 MM |
8398 | /* We check the cv-qualifiers when unifying with template type |
8399 | parameters below. We want to allow ARG `const T' to unify with | |
8400 | PARM `T' for example, when computing which of two templates | |
8401 | is more specialized, for example. */ | |
8402 | && TREE_CODE (arg) != TEMPLATE_TYPE_PARM | |
8403 | && !check_cv_quals_for_unify (strict, arg, parm)) | |
49432171 JM |
8404 | return 1; |
8405 | ||
8d08fdba MS |
8406 | switch (TREE_CODE (parm)) |
8407 | { | |
2ca340ae JM |
8408 | case TYPENAME_TYPE: |
8409 | /* In a type which contains a nested-name-specifier, template | |
8410 | argument values cannot be deduced for template parameters used | |
8411 | within the nested-name-specifier. */ | |
8412 | return 0; | |
8413 | ||
8d08fdba | 8414 | case TEMPLATE_TYPE_PARM: |
73b0fce8 | 8415 | case TEMPLATE_TEMPLATE_PARM: |
a1281f45 | 8416 | case BOUND_TEMPLATE_TEMPLATE_PARM: |
db2767b6 MM |
8417 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
8418 | ||
8419 | if (TEMPLATE_TYPE_LEVEL (parm) | |
8420 | != template_decl_level (tparm)) | |
8421 | /* The PARM is not one we're trying to unify. Just check | |
8422 | to see if it matches ARG. */ | |
8423 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
3bfdc719 | 8424 | && same_type_p (parm, arg)) ? 0 : 1; |
73b0fce8 | 8425 | idx = TEMPLATE_TYPE_IDX (parm); |
050367a3 | 8426 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 8427 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx)); |
050367a3 | 8428 | |
73b0fce8 | 8429 | /* Check for mixed types and values. */ |
db2767b6 MM |
8430 | if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM |
8431 | && TREE_CODE (tparm) != TYPE_DECL) | |
8432 | || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
8433 | && TREE_CODE (tparm) != TEMPLATE_DECL)) | |
73b0fce8 KL |
8434 | return 1; |
8435 | ||
a1281f45 | 8436 | if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM) |
73b0fce8 | 8437 | { |
b429fdf0 KL |
8438 | /* ARG must be constructed from a template class or a template |
8439 | template parameter. */ | |
8440 | if (TREE_CODE (arg) != BOUND_TEMPLATE_TEMPLATE_PARM | |
8441 | && (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg))) | |
a1281f45 | 8442 | return 1; |
73b0fce8 | 8443 | |
a1281f45 KL |
8444 | { |
8445 | tree parmtmpl = TYPE_TI_TEMPLATE (parm); | |
8446 | tree parmvec = TYPE_TI_ARGS (parm); | |
b429fdf0 | 8447 | tree argvec = TYPE_TI_ARGS (arg); |
a1281f45 | 8448 | tree argtmplvec |
b429fdf0 | 8449 | = DECL_INNERMOST_TEMPLATE_PARMS (TYPE_TI_TEMPLATE (arg)); |
a1281f45 | 8450 | int i; |
73b0fce8 | 8451 | |
a1281f45 KL |
8452 | /* The parameter and argument roles have to be switched here |
8453 | in order to handle default arguments properly. For example, | |
8454 | template<template <class> class TT> void f(TT<int>) | |
8455 | should be able to accept vector<int> which comes from | |
8456 | template <class T, class Allocator = allocator> | |
8457 | class vector. */ | |
8458 | ||
8459 | if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 0, 1) | |
8460 | == error_mark_node) | |
8461 | return 1; | |
73b0fce8 | 8462 | |
a1281f45 KL |
8463 | /* Deduce arguments T, i from TT<T> or TT<i>. |
8464 | We check each element of PARMVEC and ARGVEC individually | |
8465 | rather than the whole TREE_VEC since they can have | |
8466 | different number of elements. */ | |
6b9b6b15 | 8467 | |
a1281f45 KL |
8468 | for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i) |
8469 | { | |
8470 | tree t = TREE_VEC_ELT (parmvec, i); | |
73b0fce8 | 8471 | |
a1281f45 KL |
8472 | if (unify (tparms, targs, t, |
8473 | TREE_VEC_ELT (argvec, i), | |
8474 | UNIFY_ALLOW_NONE)) | |
8475 | return 1; | |
73b0fce8 | 8476 | } |
a1281f45 | 8477 | } |
b429fdf0 | 8478 | arg = TYPE_TI_TEMPLATE (arg); |
a1281f45 KL |
8479 | |
8480 | /* Fall through to deduce template name. */ | |
8481 | } | |
8482 | ||
8483 | if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
8484 | || TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
8485 | { | |
8486 | /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */ | |
8487 | ||
8488 | /* Simple cases: Value already set, does match or doesn't. */ | |
8489 | if (targ != NULL_TREE && template_args_equal (targ, arg)) | |
8490 | return 0; | |
8491 | else if (targ) | |
8492 | return 1; | |
db2767b6 MM |
8493 | } |
8494 | else | |
8495 | { | |
830bfa74 MM |
8496 | /* If PARM is `const T' and ARG is only `int', we don't have |
8497 | a match unless we are allowing additional qualification. | |
8498 | If ARG is `const int' and PARM is just `T' that's OK; | |
8499 | that binds `const int' to `T'. */ | |
8500 | if (!check_cv_quals_for_unify (strict | UNIFY_ALLOW_LESS_CV_QUAL, | |
8501 | arg, parm)) | |
db2767b6 MM |
8502 | return 1; |
8503 | ||
830bfa74 MM |
8504 | /* Consider the case where ARG is `const volatile int' and |
8505 | PARM is `const T'. Then, T should be `volatile int'. */ | |
8506 | arg = | |
adecb3f4 MM |
8507 | cp_build_qualified_type_real (arg, |
8508 | CP_TYPE_QUALS (arg) | |
8509 | & ~CP_TYPE_QUALS (parm), | |
8510 | /*complain=*/0); | |
8511 | if (arg == error_mark_node) | |
8512 | return 1; | |
73b0fce8 | 8513 | |
a1281f45 KL |
8514 | /* Simple cases: Value already set, does match or doesn't. */ |
8515 | if (targ != NULL_TREE && same_type_p (targ, arg)) | |
8516 | return 0; | |
8517 | else if (targ) | |
8518 | return 1; | |
8519 | } | |
61cd552e MM |
8520 | |
8521 | /* Make sure that ARG is not a variable-sized array. (Note that | |
8522 | were talking about variable-sized arrays (like `int[n]'), | |
8523 | rather than arrays of unknown size (like `int[]').) We'll | |
8524 | get very confused by such a type since the bound of the array | |
8525 | will not be computable in an instantiation. Besides, such | |
8526 | types are not allowed in ISO C++, so we can do as we please | |
8527 | here. */ | |
8528 | if (TREE_CODE (arg) == ARRAY_TYPE | |
8529 | && !uses_template_parms (arg) | |
8530 | && (TREE_CODE (TYPE_MAX_VALUE (TYPE_DOMAIN (arg))) | |
8531 | != INTEGER_CST)) | |
8532 | return 1; | |
8533 | ||
050367a3 | 8534 | TREE_VEC_ELT (targs, idx) = arg; |
73b0fce8 KL |
8535 | return 0; |
8536 | ||
f84b4be9 | 8537 | case TEMPLATE_PARM_INDEX: |
db2767b6 MM |
8538 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
8539 | ||
8540 | if (TEMPLATE_PARM_LEVEL (parm) | |
8541 | != template_decl_level (tparm)) | |
8542 | /* The PARM is not one we're trying to unify. Just check | |
8543 | to see if it matches ARG. */ | |
8544 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
67ffc812 | 8545 | && cp_tree_equal (parm, arg) > 0) ? 0 : 1; |
db2767b6 | 8546 | |
f84b4be9 | 8547 | idx = TEMPLATE_PARM_IDX (parm); |
050367a3 | 8548 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 8549 | |
050367a3 | 8550 | if (targ) |
8d08fdba | 8551 | { |
67ffc812 | 8552 | int i = (cp_tree_equal (targ, arg) > 0); |
312e7d50 JM |
8553 | if (i == 1) |
8554 | return 0; | |
8555 | else if (i == 0) | |
8556 | return 1; | |
8557 | else | |
8558 | my_friendly_abort (42); | |
8d08fdba | 8559 | } |
8d08fdba | 8560 | |
161c12b0 JM |
8561 | /* [temp.deduct.type] If, in the declaration of a function template |
8562 | with a non-type template-parameter, the non-type | |
8563 | template-parameter is used in an expression in the function | |
8564 | parameter-list and, if the corresponding template-argument is | |
8565 | deduced, the template-argument type shall match the type of the | |
8566 | template-parameter exactly, except that a template-argument | |
d7c4edd0 NS |
8567 | deduced from an array bound may be of any integral type. |
8568 | The non-type parameter might use already deduced type parameters. */ | |
8569 | if (same_type_p (TREE_TYPE (arg), | |
8570 | tsubst (TREE_TYPE (parm), targs, 0, NULL_TREE))) | |
161c12b0 JM |
8571 | /* OK */; |
8572 | else if ((strict & UNIFY_ALLOW_INTEGER) | |
8573 | && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE | |
8574 | || TREE_CODE (TREE_TYPE (parm)) == BOOLEAN_TYPE)) | |
8575 | /* OK */; | |
8576 | else | |
8577 | return 1; | |
8578 | ||
2a1e9fdd | 8579 | TREE_VEC_ELT (targs, idx) = arg; |
8d08fdba MS |
8580 | return 0; |
8581 | ||
8582 | case POINTER_TYPE: | |
830bfa74 MM |
8583 | { |
8584 | int sub_strict; | |
4ac14744 | 8585 | |
830bfa74 MM |
8586 | if (TREE_CODE (arg) != POINTER_TYPE) |
8587 | return 1; | |
8588 | ||
8589 | /* [temp.deduct.call] | |
8590 | ||
8591 | A can be another pointer or pointer to member type that can | |
8592 | be converted to the deduced A via a qualification | |
8593 | conversion (_conv.qual_). | |
8594 | ||
8595 | We pass down STRICT here rather than UNIFY_ALLOW_NONE. | |
8596 | This will allow for additional cv-qualification of the | |
8597 | pointed-to types if appropriate. In general, this is a bit | |
8598 | too generous; we are only supposed to allow qualification | |
8599 | conversions and this method will allow an ARG of char** and | |
8600 | a deduced ARG of const char**. However, overload | |
8601 | resolution will subsequently invalidate the candidate, so | |
8602 | this is probably OK. */ | |
8603 | sub_strict = strict; | |
8604 | ||
a7a64a77 | 8605 | if (TREE_CODE (TREE_TYPE (arg)) != RECORD_TYPE) |
830bfa74 MM |
8606 | /* The derived-to-base conversion only persists through one |
8607 | level of pointers. */ | |
8608 | sub_strict &= ~UNIFY_ALLOW_DERIVED; | |
8609 | ||
a7a64a77 MM |
8610 | return unify (tparms, targs, TREE_TYPE (parm), |
8611 | TREE_TYPE (arg), sub_strict); | |
830bfa74 | 8612 | } |
8d08fdba MS |
8613 | |
8614 | case REFERENCE_TYPE: | |
830bfa74 MM |
8615 | if (TREE_CODE (arg) != REFERENCE_TYPE) |
8616 | return 1; | |
8617 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), | |
4393e105 | 8618 | UNIFY_ALLOW_NONE); |
8d08fdba MS |
8619 | |
8620 | case ARRAY_TYPE: | |
8621 | if (TREE_CODE (arg) != ARRAY_TYPE) | |
8622 | return 1; | |
3042d5be MM |
8623 | if ((TYPE_DOMAIN (parm) == NULL_TREE) |
8624 | != (TYPE_DOMAIN (arg) == NULL_TREE)) | |
8625 | return 1; | |
8626 | if (TYPE_DOMAIN (parm) != NULL_TREE | |
830bfa74 | 8627 | && unify (tparms, targs, TYPE_DOMAIN (parm), |
4393e105 | 8628 | TYPE_DOMAIN (arg), UNIFY_ALLOW_NONE) != 0) |
8d08fdba | 8629 | return 1; |
830bfa74 | 8630 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
4393e105 | 8631 | UNIFY_ALLOW_NONE); |
8d08fdba MS |
8632 | |
8633 | case REAL_TYPE: | |
37c46b43 | 8634 | case COMPLEX_TYPE: |
c00996a3 | 8635 | case VECTOR_TYPE: |
8d08fdba | 8636 | case INTEGER_TYPE: |
42976354 | 8637 | case BOOLEAN_TYPE: |
5ad5a526 | 8638 | case VOID_TYPE: |
f376e137 MS |
8639 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8640 | return 1; | |
8641 | ||
514a1f18 JM |
8642 | if (TREE_CODE (parm) == INTEGER_TYPE |
8643 | && TREE_CODE (TYPE_MAX_VALUE (parm)) != INTEGER_CST) | |
8d08fdba MS |
8644 | { |
8645 | if (TYPE_MIN_VALUE (parm) && TYPE_MIN_VALUE (arg) | |
830bfa74 | 8646 | && unify (tparms, targs, TYPE_MIN_VALUE (parm), |
4393e105 | 8647 | TYPE_MIN_VALUE (arg), UNIFY_ALLOW_INTEGER)) |
8d08fdba MS |
8648 | return 1; |
8649 | if (TYPE_MAX_VALUE (parm) && TYPE_MAX_VALUE (arg) | |
830bfa74 | 8650 | && unify (tparms, targs, TYPE_MAX_VALUE (parm), |
4393e105 | 8651 | TYPE_MAX_VALUE (arg), UNIFY_ALLOW_INTEGER)) |
8d08fdba MS |
8652 | return 1; |
8653 | } | |
9edc3913 | 8654 | /* We have already checked cv-qualification at the top of the |
514a1f18 | 8655 | function. */ |
9edc3913 | 8656 | else if (!same_type_ignoring_top_level_qualifiers_p (arg, parm)) |
ca79f85d JM |
8657 | return 1; |
8658 | ||
8d08fdba MS |
8659 | /* As far as unification is concerned, this wins. Later checks |
8660 | will invalidate it if necessary. */ | |
8661 | return 0; | |
8662 | ||
8663 | /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */ | |
bd6dd845 | 8664 | /* Type INTEGER_CST can come from ordinary constant template args. */ |
8d08fdba | 8665 | case INTEGER_CST: |
bd6dd845 MS |
8666 | while (TREE_CODE (arg) == NOP_EXPR) |
8667 | arg = TREE_OPERAND (arg, 0); | |
8668 | ||
8d08fdba MS |
8669 | if (TREE_CODE (arg) != INTEGER_CST) |
8670 | return 1; | |
8671 | return !tree_int_cst_equal (parm, arg); | |
8672 | ||
8d08fdba MS |
8673 | case TREE_VEC: |
8674 | { | |
8675 | int i; | |
8676 | if (TREE_CODE (arg) != TREE_VEC) | |
8677 | return 1; | |
8678 | if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg)) | |
8679 | return 1; | |
0dc09a61 | 8680 | for (i = 0; i < TREE_VEC_LENGTH (parm); ++i) |
830bfa74 | 8681 | if (unify (tparms, targs, |
8d08fdba | 8682 | TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i), |
4393e105 | 8683 | UNIFY_ALLOW_NONE)) |
8d08fdba MS |
8684 | return 1; |
8685 | return 0; | |
8686 | } | |
8687 | ||
8d08fdba | 8688 | case RECORD_TYPE: |
f181d4ae | 8689 | case UNION_TYPE: |
f181d4ae | 8690 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
a4443a08 | 8691 | return 1; |
830bfa74 | 8692 | |
a7a64a77 MM |
8693 | if (TYPE_PTRMEMFUNC_P (parm)) |
8694 | { | |
8695 | if (!TYPE_PTRMEMFUNC_P (arg)) | |
8696 | return 1; | |
8697 | ||
8698 | return unify (tparms, targs, | |
8699 | TYPE_PTRMEMFUNC_FN_TYPE (parm), | |
8700 | TYPE_PTRMEMFUNC_FN_TYPE (arg), | |
8701 | strict); | |
8702 | } | |
8703 | ||
5db698f6 | 8704 | if (CLASSTYPE_TEMPLATE_INFO (parm)) |
5566b478 | 8705 | { |
6467930b | 8706 | tree t = NULL_TREE; |
4393e105 | 8707 | |
830bfa74 | 8708 | if (strict & UNIFY_ALLOW_DERIVED) |
4393e105 MM |
8709 | { |
8710 | /* First, we try to unify the PARM and ARG directly. */ | |
8711 | t = try_class_unification (tparms, targs, | |
8712 | parm, arg); | |
8713 | ||
8714 | if (!t) | |
8715 | { | |
8716 | /* Fallback to the special case allowed in | |
8717 | [temp.deduct.call]: | |
8718 | ||
8719 | If P is a class, and P has the form | |
8720 | template-id, then A can be a derived class of | |
8721 | the deduced A. Likewise, if P is a pointer to | |
8722 | a class of the form template-id, A can be a | |
8723 | pointer to a derived class pointed to by the | |
8724 | deduced A. */ | |
8725 | t = get_template_base (tparms, targs, | |
8726 | parm, arg); | |
8727 | ||
8728 | if (! t || t == error_mark_node) | |
8729 | return 1; | |
8730 | } | |
8731 | } | |
6df47b06 | 8732 | else if (CLASSTYPE_TEMPLATE_INFO (arg) |
9fbf56f7 MM |
8733 | && (CLASSTYPE_TI_TEMPLATE (parm) |
8734 | == CLASSTYPE_TI_TEMPLATE (arg))) | |
6df47b06 MM |
8735 | /* Perhaps PARM is something like S<U> and ARG is S<int>. |
8736 | Then, we should unify `int' and `U'. */ | |
6467930b | 8737 | t = arg; |
4393e105 | 8738 | else |
dc957d14 | 8739 | /* There's no chance of unification succeeding. */ |
5566b478 | 8740 | return 1; |
6467930b | 8741 | |
830bfa74 | 8742 | return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm), |
4393e105 | 8743 | CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE); |
5566b478 | 8744 | } |
9edc3913 | 8745 | else if (!same_type_ignoring_top_level_qualifiers_p (parm, arg)) |
5566b478 | 8746 | return 1; |
a4443a08 | 8747 | return 0; |
8d08fdba MS |
8748 | |
8749 | case METHOD_TYPE: | |
8d08fdba | 8750 | case FUNCTION_TYPE: |
830bfa74 | 8751 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8d08fdba | 8752 | return 1; |
830bfa74 MM |
8753 | |
8754 | if (unify (tparms, targs, TREE_TYPE (parm), | |
4393e105 | 8755 | TREE_TYPE (arg), UNIFY_ALLOW_NONE)) |
28cbf42c | 8756 | return 1; |
386b8a85 | 8757 | return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm), |
3b3ba9f0 | 8758 | TYPE_ARG_TYPES (arg), 1, |
e5214479 | 8759 | DEDUCE_EXACT, 0, -1); |
a4443a08 MS |
8760 | |
8761 | case OFFSET_TYPE: | |
8762 | if (TREE_CODE (arg) != OFFSET_TYPE) | |
8763 | return 1; | |
830bfa74 | 8764 | if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm), |
4393e105 | 8765 | TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE)) |
a4443a08 | 8766 | return 1; |
830bfa74 | 8767 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
4393e105 | 8768 | strict); |
a4443a08 | 8769 | |
f62dbf03 | 8770 | case CONST_DECL: |
830bfa74 | 8771 | if (arg != decl_constant_value (parm)) |
f62dbf03 JM |
8772 | return 1; |
8773 | return 0; | |
8774 | ||
027905b4 KL |
8775 | case TEMPLATE_DECL: |
8776 | /* Matched cases are handled by the ARG == PARM test above. */ | |
8777 | return 1; | |
8778 | ||
53929c47 JM |
8779 | case MINUS_EXPR: |
8780 | if (TREE_CODE (TREE_OPERAND (parm, 1)) == INTEGER_CST) | |
8781 | { | |
8782 | /* We handle this case specially, since it comes up with | |
8783 | arrays. In particular, something like: | |
8784 | ||
8785 | template <int N> void f(int (&x)[N]); | |
8786 | ||
8787 | Here, we are trying to unify the range type, which | |
8788 | looks like [0 ... (N - 1)]. */ | |
8789 | tree t, t1, t2; | |
8790 | t1 = TREE_OPERAND (parm, 0); | |
8791 | t2 = TREE_OPERAND (parm, 1); | |
8792 | ||
24e2e58e | 8793 | t = fold (build (PLUS_EXPR, integer_type_node, arg, t2)); |
53929c47 | 8794 | |
4393e105 | 8795 | return unify (tparms, targs, t1, t, strict); |
53929c47 JM |
8796 | } |
8797 | /* else fall through */ | |
8798 | ||
8d08fdba | 8799 | default: |
050367a3 | 8800 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (parm)))) |
74601d7c KL |
8801 | { |
8802 | ||
8803 | /* We're looking at an expression. This can happen with | |
8804 | something like: | |
4393e105 | 8805 | |
74601d7c KL |
8806 | template <int I> |
8807 | void foo(S<I>, S<I + 2>); | |
050367a3 | 8808 | |
74601d7c | 8809 | This is a "nondeduced context": |
050367a3 | 8810 | |
74601d7c | 8811 | [deduct.type] |
4393e105 | 8812 | |
74601d7c | 8813 | The nondeduced contexts are: |
050367a3 | 8814 | |
74601d7c KL |
8815 | --A type that is a template-id in which one or more of |
8816 | the template-arguments is an expression that references | |
8817 | a template-parameter. | |
050367a3 | 8818 | |
74601d7c KL |
8819 | In these cases, we assume deduction succeeded, but don't |
8820 | actually infer any unifications. */ | |
8821 | ||
8822 | if (!uses_template_parms (parm) | |
8823 | && !template_args_equal (parm, arg)) | |
8824 | return 1; | |
8825 | else | |
8826 | return 0; | |
8827 | } | |
050367a3 | 8828 | else |
b4c4a9ec MM |
8829 | sorry ("use of `%s' in template type unification", |
8830 | tree_code_name [(int) TREE_CODE (parm)]); | |
050367a3 | 8831 | |
8d08fdba MS |
8832 | return 1; |
8833 | } | |
8834 | } | |
8d08fdba | 8835 | \f |
03d0f4af MM |
8836 | /* Called if RESULT is explicitly instantiated, or is a member of an |
8837 | explicitly instantiated class, or if using -frepo and the | |
8838 | instantiation of RESULT has been assigned to this file. */ | |
8839 | ||
faae18ab | 8840 | void |
5566b478 | 8841 | mark_decl_instantiated (result, extern_p) |
faae18ab MS |
8842 | tree result; |
8843 | int extern_p; | |
8844 | { | |
75650646 MM |
8845 | if (TREE_CODE (result) != FUNCTION_DECL) |
8846 | /* The TREE_PUBLIC flag for function declarations will have been | |
8847 | set correctly by tsubst. */ | |
8848 | TREE_PUBLIC (result) = 1; | |
faae18ab | 8849 | |
3ae18eaf JM |
8850 | /* We used to set this unconditionally; we moved that to |
8851 | do_decl_instantiation so it wouldn't get set on members of | |
8852 | explicit class template instantiations. But we still need to set | |
8853 | it here for the 'extern template' case in order to suppress | |
8854 | implicit instantiations. */ | |
8855 | if (extern_p) | |
8856 | SET_DECL_EXPLICIT_INSTANTIATION (result); | |
8857 | ||
faae18ab MS |
8858 | if (! extern_p) |
8859 | { | |
8860 | DECL_INTERFACE_KNOWN (result) = 1; | |
8861 | DECL_NOT_REALLY_EXTERN (result) = 1; | |
a7d87521 | 8862 | |
1a408d07 JM |
8863 | /* Always make artificials weak. */ |
8864 | if (DECL_ARTIFICIAL (result) && flag_weak) | |
8865 | comdat_linkage (result); | |
a7d87521 JM |
8866 | /* For WIN32 we also want to put explicit instantiations in |
8867 | linkonce sections. */ | |
1a408d07 | 8868 | else if (TREE_PUBLIC (result)) |
b385c841 | 8869 | maybe_make_one_only (result); |
faae18ab | 8870 | } |
f49422da | 8871 | else if (TREE_CODE (result) == FUNCTION_DECL) |
56e770bf | 8872 | defer_fn (result); |
faae18ab MS |
8873 | } |
8874 | ||
e5214479 | 8875 | /* Given two function templates PAT1 and PAT2, return: |
6467930b MS |
8876 | |
8877 | 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order]. | |
8878 | -1 if PAT2 is more specialized than PAT1. | |
e5214479 JM |
8879 | 0 if neither is more specialized. |
8880 | ||
8881 | LEN is passed through to fn_type_unification. */ | |
6467930b MS |
8882 | |
8883 | int | |
e5214479 JM |
8884 | more_specialized (pat1, pat2, len) |
8885 | tree pat1, pat2; | |
8886 | int len; | |
6467930b | 8887 | { |
98c1c668 | 8888 | tree targs; |
73aad9b9 | 8889 | int winner = 0; |
6467930b | 8890 | |
e5214479 | 8891 | targs = get_bindings_order (pat1, DECL_TEMPLATE_RESULT (pat2), len); |
73aad9b9 | 8892 | if (targs) |
36a117a5 | 8893 | --winner; |
6467930b | 8894 | |
e5214479 | 8895 | targs = get_bindings_order (pat2, DECL_TEMPLATE_RESULT (pat1), len); |
73aad9b9 | 8896 | if (targs) |
36a117a5 | 8897 | ++winner; |
6467930b | 8898 | |
73aad9b9 JM |
8899 | return winner; |
8900 | } | |
6467930b | 8901 | |
73aad9b9 | 8902 | /* Given two class template specialization list nodes PAT1 and PAT2, return: |
6467930b | 8903 | |
73aad9b9 JM |
8904 | 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order]. |
8905 | -1 if PAT2 is more specialized than PAT1. | |
8906 | 0 if neither is more specialized. */ | |
8907 | ||
8908 | int | |
8909 | more_specialized_class (pat1, pat2) | |
8910 | tree pat1, pat2; | |
8911 | { | |
8912 | tree targs; | |
8913 | int winner = 0; | |
8914 | ||
36a117a5 MM |
8915 | targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1), |
8916 | TREE_PURPOSE (pat2)); | |
73aad9b9 JM |
8917 | if (targs) |
8918 | --winner; | |
8919 | ||
36a117a5 MM |
8920 | targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2), |
8921 | TREE_PURPOSE (pat1)); | |
73aad9b9 | 8922 | if (targs) |
6467930b MS |
8923 | ++winner; |
8924 | ||
8925 | return winner; | |
8926 | } | |
73aad9b9 JM |
8927 | |
8928 | /* Return the template arguments that will produce the function signature | |
e1467ff2 | 8929 | DECL from the function template FN, with the explicit template |
76b9a14d | 8930 | arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must |
4393e105 | 8931 | also match. Return NULL_TREE if no satisfactory arguments could be |
e5214479 JM |
8932 | found. LEN is passed through to fn_type_unification. */ |
8933 | ||
76b9a14d | 8934 | static tree |
e5214479 | 8935 | get_bindings_real (fn, decl, explicit_args, check_rettype, len) |
e1467ff2 | 8936 | tree fn, decl, explicit_args; |
e5214479 | 8937 | int check_rettype, len; |
73aad9b9 | 8938 | { |
98c1c668 | 8939 | int ntparms = DECL_NTPARMS (fn); |
f31c0a32 | 8940 | tree targs = make_tree_vec (ntparms); |
4393e105 | 8941 | tree decl_type; |
03017874 | 8942 | tree decl_arg_types; |
98c1c668 JM |
8943 | int i; |
8944 | ||
4393e105 MM |
8945 | /* Substitute the explicit template arguments into the type of DECL. |
8946 | The call to fn_type_unification will handle substitution into the | |
8947 | FN. */ | |
8948 | decl_type = TREE_TYPE (decl); | |
8949 | if (explicit_args && uses_template_parms (decl_type)) | |
8950 | { | |
8951 | tree tmpl; | |
8952 | tree converted_args; | |
8953 | ||
8954 | if (DECL_TEMPLATE_INFO (decl)) | |
8955 | tmpl = DECL_TI_TEMPLATE (decl); | |
8956 | else | |
8957 | /* We can get here for some illegal specializations. */ | |
8958 | return NULL_TREE; | |
8959 | ||
8960 | converted_args | |
8961 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
8962 | explicit_args, NULL_TREE, | |
8963 | /*complain=*/0, | |
8964 | /*require_all_arguments=*/0)); | |
8965 | if (converted_args == error_mark_node) | |
8966 | return NULL_TREE; | |
8967 | ||
8968 | decl_type = tsubst (decl_type, converted_args, /*complain=*/0, | |
8969 | NULL_TREE); | |
8970 | if (decl_type == error_mark_node) | |
8971 | return NULL_TREE; | |
8972 | } | |
8973 | ||
8974 | decl_arg_types = TYPE_ARG_TYPES (decl_type); | |
e5214479 JM |
8975 | /* Never do unification on the 'this' parameter. */ |
8976 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
03017874 | 8977 | decl_arg_types = TREE_CHAIN (decl_arg_types); |
d7684f2d | 8978 | |
e1467ff2 | 8979 | i = fn_type_unification (fn, explicit_args, targs, |
03017874 | 8980 | decl_arg_types, |
8d3631f8 NS |
8981 | (check_rettype || DECL_CONV_FN_P (fn) |
8982 | ? TREE_TYPE (decl_type) : NULL_TREE), | |
e5214479 | 8983 | DEDUCE_EXACT, len); |
98c1c668 | 8984 | |
76b9a14d JM |
8985 | if (i != 0) |
8986 | return NULL_TREE; | |
8987 | ||
76b9a14d JM |
8988 | return targs; |
8989 | } | |
8990 | ||
8991 | /* For most uses, we want to check the return type. */ | |
8992 | ||
8993 | tree | |
8994 | get_bindings (fn, decl, explicit_args) | |
8995 | tree fn, decl, explicit_args; | |
8996 | { | |
e5214479 | 8997 | return get_bindings_real (fn, decl, explicit_args, 1, -1); |
76b9a14d JM |
8998 | } |
8999 | ||
e5214479 JM |
9000 | /* But for resolve_overloaded_unification, we only care about the parameter |
9001 | types. */ | |
76b9a14d JM |
9002 | |
9003 | static tree | |
9004 | get_bindings_overload (fn, decl, explicit_args) | |
9005 | tree fn, decl, explicit_args; | |
9006 | { | |
e5214479 JM |
9007 | return get_bindings_real (fn, decl, explicit_args, 0, -1); |
9008 | } | |
9009 | ||
9010 | /* And for more_specialized, we want to be able to stop partway. */ | |
9011 | ||
9012 | static tree | |
9013 | get_bindings_order (fn, decl, len) | |
9014 | tree fn, decl; | |
9015 | int len; | |
9016 | { | |
9017 | return get_bindings_real (fn, decl, NULL_TREE, 0, len); | |
73aad9b9 JM |
9018 | } |
9019 | ||
36a117a5 MM |
9020 | /* Return the innermost template arguments that, when applied to a |
9021 | template specialization whose innermost template parameters are | |
9022 | TPARMS, and whose specialization arguments are ARGS, yield the | |
9023 | ARGS. | |
9024 | ||
9025 | For example, suppose we have: | |
9026 | ||
9027 | template <class T, class U> struct S {}; | |
9028 | template <class T> struct S<T*, int> {}; | |
9029 | ||
9030 | Then, suppose we want to get `S<double*, int>'. The TPARMS will be | |
9031 | {T}, the PARMS will be {T*, int} and the ARGS will be {double*, | |
9032 | int}. The resulting vector will be {double}, indicating that `T' | |
9033 | is bound to `double'. */ | |
9034 | ||
bd6dd845 | 9035 | static tree |
36a117a5 MM |
9036 | get_class_bindings (tparms, parms, args) |
9037 | tree tparms, parms, args; | |
73aad9b9 | 9038 | { |
3b3ba9f0 | 9039 | int i, ntparms = TREE_VEC_LENGTH (tparms); |
f31c0a32 | 9040 | tree vec = make_tree_vec (ntparms); |
73aad9b9 | 9041 | |
74601d7c KL |
9042 | if (unify (tparms, vec, parms, INNERMOST_TEMPLATE_ARGS (args), |
9043 | UNIFY_ALLOW_NONE)) | |
fcfb9f96 | 9044 | return NULL_TREE; |
73aad9b9 JM |
9045 | |
9046 | for (i = 0; i < ntparms; ++i) | |
9047 | if (! TREE_VEC_ELT (vec, i)) | |
9048 | return NULL_TREE; | |
9049 | ||
74601d7c KL |
9050 | if (verify_class_unification (vec, parms, args)) |
9051 | return NULL_TREE; | |
9052 | ||
73aad9b9 JM |
9053 | return vec; |
9054 | } | |
9055 | ||
104bf76a MM |
9056 | /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs. |
9057 | Pick the most specialized template, and return the corresponding | |
9058 | instantiation, or if there is no corresponding instantiation, the | |
e5214479 JM |
9059 | template itself. If there is no most specialized template, |
9060 | error_mark_node is returned. If there are no templates at all, | |
9061 | NULL_TREE is returned. */ | |
73aad9b9 JM |
9062 | |
9063 | tree | |
e5214479 | 9064 | most_specialized_instantiation (instantiations) |
104bf76a | 9065 | tree instantiations; |
73aad9b9 | 9066 | { |
104bf76a | 9067 | tree fn, champ; |
73aad9b9 JM |
9068 | int fate; |
9069 | ||
104bf76a | 9070 | if (!instantiations) |
73aad9b9 JM |
9071 | return NULL_TREE; |
9072 | ||
104bf76a MM |
9073 | champ = instantiations; |
9074 | for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn)) | |
73aad9b9 | 9075 | { |
e5214479 | 9076 | fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn), -1); |
73aad9b9 JM |
9077 | if (fate == 1) |
9078 | ; | |
9079 | else | |
9080 | { | |
9081 | if (fate == 0) | |
9082 | { | |
9083 | fn = TREE_CHAIN (fn); | |
9084 | if (! fn) | |
9085 | return error_mark_node; | |
9086 | } | |
104bf76a | 9087 | champ = fn; |
73aad9b9 JM |
9088 | } |
9089 | } | |
9090 | ||
104bf76a | 9091 | for (fn = instantiations; fn && fn != champ; fn = TREE_CHAIN (fn)) |
73aad9b9 | 9092 | { |
e5214479 | 9093 | fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn), -1); |
73aad9b9 JM |
9094 | if (fate != 1) |
9095 | return error_mark_node; | |
9096 | } | |
9097 | ||
104bf76a MM |
9098 | return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ); |
9099 | } | |
9100 | ||
9101 | /* Return the most specialized of the list of templates in FNS that can | |
9102 | produce an instantiation matching DECL, given the explicit template | |
9103 | arguments EXPLICIT_ARGS. */ | |
9104 | ||
e9659ab0 | 9105 | static tree |
104bf76a MM |
9106 | most_specialized (fns, decl, explicit_args) |
9107 | tree fns, decl, explicit_args; | |
9108 | { | |
9109 | tree candidates = NULL_TREE; | |
9110 | tree fn, args; | |
9111 | ||
9112 | for (fn = fns; fn; fn = TREE_CHAIN (fn)) | |
9113 | { | |
9114 | tree candidate = TREE_VALUE (fn); | |
9115 | ||
9116 | args = get_bindings (candidate, decl, explicit_args); | |
9117 | if (args) | |
e1b3e07d | 9118 | candidates = tree_cons (NULL_TREE, candidate, candidates); |
104bf76a MM |
9119 | } |
9120 | ||
e5214479 | 9121 | return most_specialized_instantiation (candidates); |
73aad9b9 JM |
9122 | } |
9123 | ||
36a117a5 | 9124 | /* If DECL is a specialization of some template, return the most |
f9a7ae04 MM |
9125 | general such template. Otherwise, returns NULL_TREE. |
9126 | ||
9127 | For example, given: | |
36a117a5 MM |
9128 | |
9129 | template <class T> struct S { template <class U> void f(U); }; | |
9130 | ||
9131 | if TMPL is `template <class U> void S<int>::f(U)' this will return | |
9132 | the full template. This function will not trace past partial | |
9133 | specializations, however. For example, given in addition: | |
9134 | ||
9135 | template <class T> struct S<T*> { template <class U> void f(U); }; | |
9136 | ||
9137 | if TMPL is `template <class U> void S<int*>::f(U)' this will return | |
9138 | `template <class T> template <class U> S<T*>::f(U)'. */ | |
73aad9b9 | 9139 | |
612c671a | 9140 | tree |
36a117a5 MM |
9141 | most_general_template (decl) |
9142 | tree decl; | |
73aad9b9 | 9143 | { |
f9a7ae04 MM |
9144 | /* If DECL is a FUNCTION_DECL, find the TEMPLATE_DECL of which it is |
9145 | an immediate specialization. */ | |
9146 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
9147 | { | |
9148 | if (DECL_TEMPLATE_INFO (decl)) { | |
9149 | decl = DECL_TI_TEMPLATE (decl); | |
9150 | ||
9151 | /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE for a | |
9152 | template friend. */ | |
9153 | if (TREE_CODE (decl) != TEMPLATE_DECL) | |
9154 | return NULL_TREE; | |
9155 | } else | |
9156 | return NULL_TREE; | |
9157 | } | |
9158 | ||
9159 | /* Look for more and more general templates. */ | |
9160 | while (DECL_TEMPLATE_INFO (decl)) | |
9161 | { | |
9162 | /* The DECL_TI_TEMPLATE can be a LOOKUP_EXPR or IDENTIFIER_NODE | |
9163 | in some cases. (See cp-tree.h for details.) */ | |
9164 | if (TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) | |
9165 | break; | |
9166 | ||
9167 | /* Stop if we run into an explicitly specialized class template. */ | |
9168 | if (!DECL_NAMESPACE_SCOPE_P (decl) | |
9169 | && DECL_CONTEXT (decl) | |
9170 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl))) | |
9171 | break; | |
9172 | ||
9173 | decl = DECL_TI_TEMPLATE (decl); | |
9174 | } | |
36a117a5 MM |
9175 | |
9176 | return decl; | |
9177 | } | |
9178 | ||
9179 | /* Return the most specialized of the class template specializations | |
9180 | of TMPL which can produce an instantiation matching ARGS, or | |
9181 | error_mark_node if the choice is ambiguous. */ | |
9182 | ||
e9659ab0 | 9183 | static tree |
36a117a5 MM |
9184 | most_specialized_class (tmpl, args) |
9185 | tree tmpl; | |
9186 | tree args; | |
9187 | { | |
9188 | tree list = NULL_TREE; | |
9189 | tree t; | |
9190 | tree champ; | |
73aad9b9 JM |
9191 | int fate; |
9192 | ||
36a117a5 MM |
9193 | tmpl = most_general_template (tmpl); |
9194 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t)) | |
73aad9b9 | 9195 | { |
36a117a5 MM |
9196 | tree spec_args |
9197 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args); | |
9198 | if (spec_args) | |
73aad9b9 | 9199 | { |
1f8f4a0b | 9200 | list = tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list); |
73aad9b9 JM |
9201 | TREE_TYPE (list) = TREE_TYPE (t); |
9202 | } | |
9203 | } | |
9204 | ||
9205 | if (! list) | |
9206 | return NULL_TREE; | |
9207 | ||
9208 | t = list; | |
9209 | champ = t; | |
9210 | t = TREE_CHAIN (t); | |
9211 | for (; t; t = TREE_CHAIN (t)) | |
9212 | { | |
9213 | fate = more_specialized_class (champ, t); | |
9214 | if (fate == 1) | |
9215 | ; | |
9216 | else | |
9217 | { | |
9218 | if (fate == 0) | |
9219 | { | |
9220 | t = TREE_CHAIN (t); | |
9221 | if (! t) | |
9222 | return error_mark_node; | |
9223 | } | |
9224 | champ = t; | |
9225 | } | |
9226 | } | |
9227 | ||
9228 | for (t = list; t && t != champ; t = TREE_CHAIN (t)) | |
9229 | { | |
85b71cf2 | 9230 | fate = more_specialized_class (champ, t); |
73aad9b9 JM |
9231 | if (fate != 1) |
9232 | return error_mark_node; | |
9233 | } | |
9234 | ||
9235 | return champ; | |
9236 | } | |
9237 | ||
8d08fdba | 9238 | /* called from the parser. */ |
e92cc029 | 9239 | |
8d08fdba | 9240 | void |
6633d636 | 9241 | do_decl_instantiation (declspecs, declarator, storage) |
f0e01782 | 9242 | tree declspecs, declarator, storage; |
8d08fdba | 9243 | { |
c11b6f21 | 9244 | tree decl = grokdeclarator (declarator, declspecs, NORMAL, 0, NULL_TREE); |
8d08fdba | 9245 | tree result = NULL_TREE; |
faae18ab | 9246 | int extern_p = 0; |
e8abc66f | 9247 | |
3fa56191 | 9248 | if (!decl) |
dc957d14 | 9249 | /* An error occurred, for which grokdeclarator has already issued |
3fa56191 MM |
9250 | an appropriate message. */ |
9251 | return; | |
9252 | else if (! DECL_LANG_SPECIFIC (decl)) | |
ec255269 | 9253 | { |
8251199e | 9254 | cp_error ("explicit instantiation of non-template `%#D'", decl); |
ec255269 MS |
9255 | return; |
9256 | } | |
03d0f4af | 9257 | else if (TREE_CODE (decl) == VAR_DECL) |
6633d636 | 9258 | { |
03d0f4af MM |
9259 | /* There is an asymmetry here in the way VAR_DECLs and |
9260 | FUNCTION_DECLs are handled by grokdeclarator. In the case of | |
9261 | the latter, the DECL we get back will be marked as a | |
9262 | template instantiation, and the appropriate | |
9263 | DECL_TEMPLATE_INFO will be set up. This does not happen for | |
9264 | VAR_DECLs so we do the lookup here. Probably, grokdeclarator | |
9265 | should handle VAR_DECLs as it currently handles | |
9266 | FUNCTION_DECLs. */ | |
6633d636 MS |
9267 | result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, 0); |
9268 | if (result && TREE_CODE (result) != VAR_DECL) | |
03d0f4af | 9269 | { |
8251199e | 9270 | cp_error ("no matching template for `%D' found", result); |
03d0f4af MM |
9271 | return; |
9272 | } | |
6633d636 MS |
9273 | } |
9274 | else if (TREE_CODE (decl) != FUNCTION_DECL) | |
9275 | { | |
8251199e | 9276 | cp_error ("explicit instantiation of `%#D'", decl); |
6633d636 MS |
9277 | return; |
9278 | } | |
03d0f4af MM |
9279 | else |
9280 | result = decl; | |
672476cb | 9281 | |
03d0f4af MM |
9282 | /* Check for various error cases. Note that if the explicit |
9283 | instantiation is legal the RESULT will currently be marked as an | |
9284 | *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set | |
9285 | until we get here. */ | |
9286 | ||
9287 | if (DECL_TEMPLATE_SPECIALIZATION (result)) | |
672476cb | 9288 | { |
03d0f4af MM |
9289 | /* [temp.spec] |
9290 | ||
9291 | No program shall both explicitly instantiate and explicitly | |
9292 | specialize a template. */ | |
6f1b4c42 JM |
9293 | cp_pedwarn ("explicit instantiation of `%#D' after", result); |
9294 | cp_pedwarn_at ("explicit specialization here", result); | |
672476cb MM |
9295 | return; |
9296 | } | |
03d0f4af MM |
9297 | else if (DECL_EXPLICIT_INSTANTIATION (result)) |
9298 | { | |
9299 | /* [temp.spec] | |
98c1c668 | 9300 | |
03d0f4af MM |
9301 | No program shall explicitly instantiate any template more |
9302 | than once. | |
9303 | ||
2aaf816d JM |
9304 | We check DECL_INTERFACE_KNOWN so as not to complain when the first |
9305 | instantiation was `extern' and the second is not, and EXTERN_P for | |
9306 | the opposite case. If -frepo, chances are we already got marked | |
dc957d14 | 9307 | as an explicit instantiation because of the repo file. */ |
2aaf816d | 9308 | if (DECL_INTERFACE_KNOWN (result) && !extern_p && !flag_use_repository) |
6f1b4c42 | 9309 | cp_pedwarn ("duplicate explicit instantiation of `%#D'", result); |
03d0f4af MM |
9310 | |
9311 | /* If we've already instantiated the template, just return now. */ | |
9312 | if (DECL_INTERFACE_KNOWN (result)) | |
9313 | return; | |
9314 | } | |
9315 | else if (!DECL_IMPLICIT_INSTANTIATION (result)) | |
faae18ab | 9316 | { |
8251199e | 9317 | cp_error ("no matching template for `%D' found", result); |
faae18ab MS |
9318 | return; |
9319 | } | |
03d0f4af | 9320 | else if (!DECL_TEMPLATE_INFO (result)) |
6633d636 | 9321 | { |
8251199e | 9322 | cp_pedwarn ("explicit instantiation of non-template `%#D'", result); |
6633d636 MS |
9323 | return; |
9324 | } | |
9325 | ||
a0a33927 MS |
9326 | if (flag_external_templates) |
9327 | return; | |
9328 | ||
f0e01782 | 9329 | if (storage == NULL_TREE) |
00595019 | 9330 | ; |
faae18ab | 9331 | else if (storage == ridpointers[(int) RID_EXTERN]) |
03d0f4af MM |
9332 | { |
9333 | if (pedantic) | |
cab1f180 | 9334 | cp_pedwarn ("ISO C++ forbids the use of `extern' on explicit instantiations"); |
03d0f4af MM |
9335 | extern_p = 1; |
9336 | } | |
f0e01782 | 9337 | else |
8251199e | 9338 | cp_error ("storage class `%D' applied to template instantiation", |
f0e01782 | 9339 | storage); |
5566b478 | 9340 | |
03d0f4af | 9341 | SET_DECL_EXPLICIT_INSTANTIATION (result); |
5566b478 | 9342 | mark_decl_instantiated (result, extern_p); |
44a8d0b3 | 9343 | repo_template_instantiated (result, extern_p); |
c91a56d2 | 9344 | if (! extern_p) |
16d53b64 | 9345 | instantiate_decl (result, /*defer_ok=*/1); |
7177d104 MS |
9346 | } |
9347 | ||
faae18ab MS |
9348 | void |
9349 | mark_class_instantiated (t, extern_p) | |
9350 | tree t; | |
9351 | int extern_p; | |
9352 | { | |
9353 | SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t); | |
eb773359 JM |
9354 | SET_CLASSTYPE_INTERFACE_KNOWN (t); |
9355 | CLASSTYPE_INTERFACE_ONLY (t) = extern_p; | |
faae18ab MS |
9356 | CLASSTYPE_VTABLE_NEEDS_WRITING (t) = ! extern_p; |
9357 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p; | |
9358 | if (! extern_p) | |
9359 | { | |
9360 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; | |
9361 | rest_of_type_compilation (t, 1); | |
9362 | } | |
9363 | } | |
e8abc66f | 9364 | |
a1bcc528 JM |
9365 | /* Perform an explicit instantiation of template class T. STORAGE, if |
9366 | non-null, is the RID for extern, inline or static. COMPLAIN is | |
9367 | non-zero if this is called from the parser, zero if called recursively, | |
9368 | since the standard is unclear (as detailed below). */ | |
9369 | ||
7177d104 | 9370 | void |
a1bcc528 | 9371 | do_type_instantiation (t, storage, complain) |
ca79f85d | 9372 | tree t, storage; |
a1bcc528 | 9373 | int complain; |
7177d104 | 9374 | { |
e8abc66f MS |
9375 | int extern_p = 0; |
9376 | int nomem_p = 0; | |
5566b478 MS |
9377 | int static_p = 0; |
9378 | ||
ca79f85d JM |
9379 | if (TREE_CODE (t) == TYPE_DECL) |
9380 | t = TREE_TYPE (t); | |
9381 | ||
7ddedda4 | 9382 | if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t)) |
ca79f85d | 9383 | { |
8251199e | 9384 | cp_error ("explicit instantiation of non-template type `%T'", t); |
ca79f85d JM |
9385 | return; |
9386 | } | |
9387 | ||
5566b478 | 9388 | complete_type (t); |
7177d104 | 9389 | |
a292b002 MS |
9390 | /* With -fexternal-templates, explicit instantiations are treated the same |
9391 | as implicit ones. */ | |
a0a33927 MS |
9392 | if (flag_external_templates) |
9393 | return; | |
9394 | ||
d0f062fb | 9395 | if (!COMPLETE_TYPE_P (t)) |
f0e01782 | 9396 | { |
a1bcc528 JM |
9397 | if (complain) |
9398 | cp_error ("explicit instantiation of `%#T' before definition of template", | |
9399 | t); | |
f0e01782 MS |
9400 | return; |
9401 | } | |
9402 | ||
03d0f4af | 9403 | if (storage != NULL_TREE) |
f0e01782 | 9404 | { |
03d0f4af | 9405 | if (pedantic) |
cab1f180 | 9406 | cp_pedwarn("ISO C++ forbids the use of `%s' on explicit instantiations", |
8251199e | 9407 | IDENTIFIER_POINTER (storage)); |
03d0f4af MM |
9408 | |
9409 | if (storage == ridpointers[(int) RID_INLINE]) | |
9410 | nomem_p = 1; | |
9411 | else if (storage == ridpointers[(int) RID_EXTERN]) | |
9412 | extern_p = 1; | |
9413 | else if (storage == ridpointers[(int) RID_STATIC]) | |
9414 | static_p = 1; | |
9415 | else | |
9416 | { | |
8251199e | 9417 | cp_error ("storage class `%D' applied to template instantiation", |
03d0f4af MM |
9418 | storage); |
9419 | extern_p = 0; | |
9420 | } | |
f0e01782 MS |
9421 | } |
9422 | ||
370af2d5 | 9423 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
03d0f4af MM |
9424 | { |
9425 | /* [temp.spec] | |
a292b002 | 9426 | |
03d0f4af MM |
9427 | No program shall both explicitly instantiate and explicitly |
9428 | specialize a template. */ | |
a1bcc528 JM |
9429 | if (complain) |
9430 | { | |
9431 | cp_error ("explicit instantiation of `%#T' after", t); | |
9432 | cp_error_at ("explicit specialization here", t); | |
9433 | } | |
03d0f4af MM |
9434 | return; |
9435 | } | |
9436 | else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t)) | |
44a8d0b3 | 9437 | { |
03d0f4af MM |
9438 | /* [temp.spec] |
9439 | ||
9440 | No program shall explicitly instantiate any template more | |
9441 | than once. | |
9442 | ||
2aaf816d JM |
9443 | If CLASSTYPE_INTERFACE_ONLY, then the first explicit instantiation |
9444 | was `extern'. If EXTERN_P then the second is. If -frepo, chances | |
9445 | are we already got marked as an explicit instantion because of the | |
9446 | repo file. All these cases are OK. */ | |
a1bcc528 JM |
9447 | if (!CLASSTYPE_INTERFACE_ONLY (t) && !extern_p && !flag_use_repository |
9448 | && complain) | |
2aaf816d | 9449 | cp_pedwarn ("duplicate explicit instantiation of `%#T'", t); |
03d0f4af MM |
9450 | |
9451 | /* If we've already instantiated the template, just return now. */ | |
9452 | if (!CLASSTYPE_INTERFACE_ONLY (t)) | |
9453 | return; | |
44a8d0b3 | 9454 | } |
e8abc66f | 9455 | |
03d0f4af MM |
9456 | mark_class_instantiated (t, extern_p); |
9457 | repo_template_instantiated (t, extern_p); | |
9458 | ||
e8abc66f MS |
9459 | if (nomem_p) |
9460 | return; | |
9461 | ||
7177d104 | 9462 | { |
db5ae43f | 9463 | tree tmp; |
5566b478 | 9464 | |
03d0f4af MM |
9465 | /* In contrast to implicit instantiation, where only the |
9466 | declarations, and not the definitions, of members are | |
9467 | instantiated, we have here: | |
9468 | ||
9469 | [temp.explicit] | |
9470 | ||
9471 | The explicit instantiation of a class template specialization | |
9472 | implies the instantiation of all of its members not | |
9473 | previously explicitly specialized in the translation unit | |
9474 | containing the explicit instantiation. | |
9475 | ||
9476 | Of course, we can't instantiate member template classes, since | |
9477 | we don't have any arguments for them. Note that the standard | |
dc957d14 | 9478 | is unclear on whether the instantiation of the members are |
03d0f4af MM |
9479 | *explicit* instantiations or not. We choose to be generous, |
9480 | and not set DECL_EXPLICIT_INSTANTIATION. Therefore, we allow | |
9481 | the explicit instantiation of a class where some of the members | |
9482 | have no definition in the current translation unit. */ | |
9483 | ||
5566b478 MS |
9484 | if (! static_p) |
9485 | for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
a7d87521 | 9486 | if (TREE_CODE (tmp) == FUNCTION_DECL |
1f109f0f | 9487 | && DECL_TEMPLATE_INSTANTIATION (tmp)) |
5566b478 MS |
9488 | { |
9489 | mark_decl_instantiated (tmp, extern_p); | |
9490 | repo_template_instantiated (tmp, extern_p); | |
9491 | if (! extern_p) | |
16d53b64 | 9492 | instantiate_decl (tmp, /*defer_ok=*/1); |
5566b478 MS |
9493 | } |
9494 | ||
9495 | for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
9496 | if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp)) | |
863adfc0 | 9497 | { |
5566b478 | 9498 | mark_decl_instantiated (tmp, extern_p); |
863adfc0 | 9499 | repo_template_instantiated (tmp, extern_p); |
5566b478 | 9500 | if (! extern_p) |
16d53b64 | 9501 | instantiate_decl (tmp, /*defer_ok=*/1); |
863adfc0 | 9502 | } |
7177d104 | 9503 | |
a292b002 | 9504 | for (tmp = CLASSTYPE_TAGS (t); tmp; tmp = TREE_CHAIN (tmp)) |
e4a84209 MM |
9505 | if (IS_AGGR_TYPE (TREE_VALUE (tmp)) |
9506 | && !uses_template_parms (CLASSTYPE_TI_ARGS (TREE_VALUE (tmp)))) | |
a1bcc528 | 9507 | do_type_instantiation (TYPE_MAIN_DECL (TREE_VALUE (tmp)), storage, 0); |
a292b002 | 9508 | } |
8d08fdba | 9509 | } |
a28e3c7f | 9510 | |
36a117a5 MM |
9511 | /* Given a function DECL, which is a specialization of TMPL, modify |
9512 | DECL to be a re-instantiation of TMPL with the same template | |
9513 | arguments. TMPL should be the template into which tsubst'ing | |
9514 | should occur for DECL, not the most general template. | |
830bfa74 MM |
9515 | |
9516 | One reason for doing this is a scenario like this: | |
9517 | ||
9518 | template <class T> | |
9519 | void f(const T&, int i); | |
9520 | ||
9521 | void g() { f(3, 7); } | |
9522 | ||
9523 | template <class T> | |
9524 | void f(const T& t, const int i) { } | |
9525 | ||
9526 | Note that when the template is first instantiated, with | |
9527 | instantiate_template, the resulting DECL will have no name for the | |
9528 | first parameter, and the wrong type for the second. So, when we go | |
9529 | to instantiate the DECL, we regenerate it. */ | |
9530 | ||
e9659ab0 | 9531 | static void |
830bfa74 MM |
9532 | regenerate_decl_from_template (decl, tmpl) |
9533 | tree decl; | |
9534 | tree tmpl; | |
9535 | { | |
f9a7ae04 MM |
9536 | /* The most general version of TMPL. */ |
9537 | tree gen_tmpl; | |
9538 | /* The arguments used to instantiate DECL, from the most general | |
9539 | template. */ | |
830bfa74 | 9540 | tree args; |
830bfa74 MM |
9541 | tree code_pattern; |
9542 | tree new_decl; | |
36a117a5 | 9543 | int unregistered; |
830bfa74 MM |
9544 | |
9545 | args = DECL_TI_ARGS (decl); | |
9546 | code_pattern = DECL_TEMPLATE_RESULT (tmpl); | |
9547 | ||
8251199e JM |
9548 | /* Unregister the specialization so that when we tsubst we will not |
9549 | just return DECL. We don't have to unregister DECL from TMPL | |
9550 | because if would only be registered there if it were a partial | |
9551 | instantiation of a specialization, which it isn't: it's a full | |
9552 | instantiation. */ | |
36a117a5 MM |
9553 | gen_tmpl = most_general_template (tmpl); |
9554 | unregistered = unregister_specialization (decl, gen_tmpl); | |
9555 | ||
9556 | /* If the DECL was not unregistered then something peculiar is | |
9557 | happening: we created a specialization but did not call | |
9558 | register_specialization for it. */ | |
9559 | my_friendly_assert (unregistered, 0); | |
9560 | ||
61a127b3 MM |
9561 | if (TREE_CODE (decl) == VAR_DECL) |
9562 | /* Make sure that we can see identifiers, and compute access | |
9563 | correctly, for the class members used in the declaration of | |
9564 | this static variable. */ | |
9565 | pushclass (DECL_CONTEXT (decl), 2); | |
9566 | ||
d8c4447d | 9567 | /* Do the substitution to get the new declaration. */ |
4393e105 | 9568 | new_decl = tsubst (code_pattern, args, /*complain=*/1, NULL_TREE); |
830bfa74 MM |
9569 | |
9570 | if (TREE_CODE (decl) == VAR_DECL) | |
9571 | { | |
9572 | /* Set up DECL_INITIAL, since tsubst doesn't. */ | |
830bfa74 | 9573 | DECL_INITIAL (new_decl) = |
d8c4447d | 9574 | tsubst_expr (DECL_INITIAL (code_pattern), args, |
4393e105 | 9575 | /*complain=*/1, DECL_TI_TEMPLATE (decl)); |
61a127b3 | 9576 | /* Pop the class context we pushed above. */ |
b74a0560 | 9577 | popclass (); |
830bfa74 | 9578 | } |
2b0a63a3 | 9579 | else if (TREE_CODE (decl) == FUNCTION_DECL) |
fbf1c34b MM |
9580 | { |
9581 | /* Convince duplicate_decls to use the DECL_ARGUMENTS from the | |
9582 | new decl. */ | |
9583 | DECL_INITIAL (new_decl) = error_mark_node; | |
9584 | /* And don't complain about a duplicate definition. */ | |
9585 | DECL_INITIAL (decl) = NULL_TREE; | |
9586 | } | |
36a117a5 MM |
9587 | |
9588 | /* The immediate parent of the new template is still whatever it was | |
9589 | before, even though tsubst sets DECL_TI_TEMPLATE up as the most | |
9590 | general template. We also reset the DECL_ASSEMBLER_NAME since | |
9591 | tsubst always calculates the name as if the function in question | |
9592 | were really a template instance, and sometimes, with friend | |
9593 | functions, this is not so. See tsubst_friend_function for | |
9594 | details. */ | |
9595 | DECL_TI_TEMPLATE (new_decl) = DECL_TI_TEMPLATE (decl); | |
9596 | DECL_ASSEMBLER_NAME (new_decl) = DECL_ASSEMBLER_NAME (decl); | |
9597 | DECL_RTL (new_decl) = DECL_RTL (decl); | |
459c43ad | 9598 | DECL_USE_TEMPLATE (new_decl) = DECL_USE_TEMPLATE (decl); |
36a117a5 MM |
9599 | |
9600 | /* Call duplicate decls to merge the old and new declarations. */ | |
830bfa74 MM |
9601 | duplicate_decls (new_decl, decl); |
9602 | ||
36a117a5 MM |
9603 | /* Now, re-register the specialization. */ |
9604 | register_specialization (decl, gen_tmpl, args); | |
830bfa74 MM |
9605 | } |
9606 | ||
16d53b64 MM |
9607 | /* Produce the definition of D, a _DECL generated from a template. If |
9608 | DEFER_OK is non-zero, then we don't have to actually do the | |
9609 | instantiation now; we just have to do it sometime. */ | |
f84b4be9 | 9610 | |
a28e3c7f | 9611 | tree |
16d53b64 | 9612 | instantiate_decl (d, defer_ok) |
5566b478 | 9613 | tree d; |
16d53b64 | 9614 | int defer_ok; |
a28e3c7f | 9615 | { |
36a117a5 MM |
9616 | tree tmpl = DECL_TI_TEMPLATE (d); |
9617 | tree args = DECL_TI_ARGS (d); | |
830bfa74 | 9618 | tree td; |
36a117a5 MM |
9619 | tree code_pattern; |
9620 | tree spec; | |
9621 | tree gen_tmpl; | |
5566b478 | 9622 | int pattern_defined; |
c27be9b9 | 9623 | int line = lineno; |
3b304f5b | 9624 | const char *file = input_filename; |
5566b478 | 9625 | |
36a117a5 MM |
9626 | /* This function should only be used to instantiate templates for |
9627 | functions and static member variables. */ | |
9628 | my_friendly_assert (TREE_CODE (d) == FUNCTION_DECL | |
9629 | || TREE_CODE (d) == VAR_DECL, 0); | |
9630 | ||
db9b2174 MM |
9631 | /* Don't instantiate cloned functions. Instead, instantiate the |
9632 | functions they cloned. */ | |
9633 | if (TREE_CODE (d) == FUNCTION_DECL && DECL_CLONED_FUNCTION_P (d)) | |
9634 | d = DECL_CLONED_FUNCTION (d); | |
9635 | ||
fbf1c34b | 9636 | if (DECL_TEMPLATE_INSTANTIATED (d)) |
03d0f4af | 9637 | /* D has already been instantiated. It might seem reasonable to |
dc957d14 | 9638 | check whether or not D is an explicit instantiation, and, if so, |
03d0f4af MM |
9639 | stop here. But when an explicit instantiation is deferred |
9640 | until the end of the compilation, DECL_EXPLICIT_INSTANTIATION | |
9641 | is set, even though we still need to do the instantiation. */ | |
36a117a5 MM |
9642 | return d; |
9643 | ||
9644 | /* If we already have a specialization of this declaration, then | |
9645 | there's no reason to instantiate it. Note that | |
9646 | retrieve_specialization gives us both instantiations and | |
9647 | specializations, so we must explicitly check | |
9648 | DECL_TEMPLATE_SPECIALIZATION. */ | |
9649 | gen_tmpl = most_general_template (tmpl); | |
9650 | spec = retrieve_specialization (gen_tmpl, args); | |
9651 | if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec)) | |
9652 | return spec; | |
9653 | ||
9654 | /* This needs to happen before any tsubsting. */ | |
9655 | if (! push_tinst_level (d)) | |
9656 | return d; | |
9657 | ||
297a5329 JM |
9658 | timevar_push (TV_PARSE); |
9659 | ||
4d85e00e MM |
9660 | /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern |
9661 | for the instantiation. This is not always the most general | |
9662 | template. Consider, for example: | |
9663 | ||
9664 | template <class T> | |
9665 | struct S { template <class U> void f(); | |
9666 | template <> void f<int>(); }; | |
9667 | ||
9668 | and an instantiation of S<double>::f<int>. We want TD to be the | |
9669 | specialization S<T>::f<int>, not the more general S<T>::f<U>. */ | |
9670 | td = tmpl; | |
f9a7ae04 MM |
9671 | while (/* An instantiation cannot have a definition, so we need a |
9672 | more general template. */ | |
9673 | DECL_TEMPLATE_INSTANTIATION (td) | |
9674 | /* We must also deal with friend templates. Given: | |
9675 | ||
9676 | template <class T> struct S { | |
9677 | template <class U> friend void f() {}; | |
9678 | }; | |
9679 | ||
9680 | S<int>::f<U> say, is not an instantiation of S<T>::f<U>, | |
9681 | so far as the language is concerned, but that's still | |
9682 | where we get the pattern for the instantiation from. On | |
dc957d14 | 9683 | other hand, if the definition comes outside the class, say: |
f9a7ae04 MM |
9684 | |
9685 | template <class T> struct S { | |
9686 | template <class U> friend void f(); | |
9687 | }; | |
9688 | template <class U> friend void f() {} | |
9689 | ||
9690 | we don't need to look any further. That's what the check for | |
9691 | DECL_INITIAL is for. */ | |
9692 | || (TREE_CODE (d) == FUNCTION_DECL | |
9693 | && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (td) | |
9694 | && !DECL_INITIAL (DECL_TEMPLATE_RESULT (td)))) | |
4d85e00e MM |
9695 | { |
9696 | /* The present template, TD, should not be a definition. If it | |
9697 | were a definition, we should be using it! Note that we | |
9698 | cannot restructure the loop to just keep going until we find | |
9699 | a template with a definition, since that might go too far if | |
9700 | a specialization was declared, but not defined. */ | |
4d85e00e MM |
9701 | my_friendly_assert (!(TREE_CODE (d) == VAR_DECL |
9702 | && !DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (td))), | |
9703 | 0); | |
9704 | ||
9705 | /* Fetch the more general template. */ | |
9706 | td = DECL_TI_TEMPLATE (td); | |
9707 | } | |
27bb8339 | 9708 | |
fee23f54 | 9709 | code_pattern = DECL_TEMPLATE_RESULT (td); |
27bb8339 | 9710 | |
5566b478 | 9711 | if (TREE_CODE (d) == FUNCTION_DECL) |
39c76b4f | 9712 | pattern_defined = (DECL_SAVED_TREE (code_pattern) != NULL_TREE); |
5566b478 | 9713 | else |
36a117a5 | 9714 | pattern_defined = ! DECL_IN_AGGR_P (code_pattern); |
de22184b | 9715 | |
de22184b MS |
9716 | lineno = DECL_SOURCE_LINE (d); |
9717 | input_filename = DECL_SOURCE_FILE (d); | |
9718 | ||
de22184b | 9719 | if (pattern_defined) |
5566b478 MS |
9720 | { |
9721 | repo_template_used (d); | |
9722 | ||
9723 | if (flag_external_templates && ! DECL_INTERFACE_KNOWN (d)) | |
9724 | { | |
9725 | if (flag_alt_external_templates) | |
9726 | { | |
9727 | if (interface_unknown) | |
9728 | warn_if_unknown_interface (d); | |
9729 | } | |
fee23f54 | 9730 | else if (DECL_INTERFACE_KNOWN (code_pattern)) |
5566b478 MS |
9731 | { |
9732 | DECL_INTERFACE_KNOWN (d) = 1; | |
fee23f54 | 9733 | DECL_NOT_REALLY_EXTERN (d) = ! DECL_EXTERNAL (code_pattern); |
5566b478 MS |
9734 | } |
9735 | else | |
fee23f54 | 9736 | warn_if_unknown_interface (code_pattern); |
5566b478 MS |
9737 | } |
9738 | ||
e92cc029 | 9739 | if (at_eof) |
5566b478 MS |
9740 | import_export_decl (d); |
9741 | } | |
9742 | ||
16d53b64 MM |
9743 | /* We need to set up DECL_INITIAL regardless of pattern_defined if |
9744 | the variable is a static const initialized in the class body. */ | |
67ffc812 | 9745 | if (TREE_CODE (d) == VAR_DECL |
711734a9 | 9746 | && TREE_READONLY (d) |
67ffc812 MM |
9747 | && DECL_INITIAL (d) == NULL_TREE |
9748 | && DECL_INITIAL (code_pattern) != NULL_TREE) | |
16d53b64 | 9749 | ; |
930cd796 MM |
9750 | /* Reject all external templates except inline functions. */ |
9751 | else if (DECL_INTERFACE_KNOWN (d) | |
9752 | && ! DECL_NOT_REALLY_EXTERN (d) | |
9753 | && ! (TREE_CODE (d) == FUNCTION_DECL && DECL_INLINE (d))) | |
9754 | goto out; | |
16d53b64 MM |
9755 | /* Defer all other templates, unless we have been explicitly |
9756 | forbidden from doing so. We restore the source position here | |
9757 | because it's used by add_pending_template. */ | |
9758 | else if (! pattern_defined || defer_ok) | |
9759 | { | |
c27be9b9 JM |
9760 | lineno = line; |
9761 | input_filename = file; | |
9762 | ||
03d0f4af MM |
9763 | if (at_eof && !pattern_defined |
9764 | && DECL_EXPLICIT_INSTANTIATION (d)) | |
9765 | /* [temp.explicit] | |
9766 | ||
9767 | The definition of a non-exported function template, a | |
9768 | non-exported member function template, or a non-exported | |
9769 | member function or static data member of a class template | |
9770 | shall be present in every translation unit in which it is | |
9771 | explicitly instantiated. */ | |
8251199e | 9772 | cp_error ("explicit instantiation of `%D' but no definition available", |
03d0f4af MM |
9773 | d); |
9774 | ||
5566b478 | 9775 | add_pending_template (d); |
de22184b | 9776 | goto out; |
5566b478 MS |
9777 | } |
9778 | ||
414ea4aa MM |
9779 | push_to_top_level (); |
9780 | ||
2b0a63a3 MM |
9781 | /* We're now committed to instantiating this template. Mark it as |
9782 | instantiated so that recursive calls to instantiate_decl do not | |
9783 | try to instantiate it again. */ | |
fbf1c34b | 9784 | DECL_TEMPLATE_INSTANTIATED (d) = 1; |
120722ac | 9785 | |
2b0a63a3 MM |
9786 | /* Regenerate the declaration in case the template has been modified |
9787 | by a subsequent redeclaration. */ | |
9788 | regenerate_decl_from_template (d, td); | |
9789 | ||
120722ac MM |
9790 | /* We already set the file and line above. Reset them now in case |
9791 | they changed as a result of calling regenerate_decl_from_template. */ | |
5156628f MS |
9792 | lineno = DECL_SOURCE_LINE (d); |
9793 | input_filename = DECL_SOURCE_FILE (d); | |
9794 | ||
5566b478 MS |
9795 | if (TREE_CODE (d) == VAR_DECL) |
9796 | { | |
9797 | DECL_IN_AGGR_P (d) = 0; | |
9798 | if (DECL_INTERFACE_KNOWN (d)) | |
9799 | DECL_EXTERNAL (d) = ! DECL_NOT_REALLY_EXTERN (d); | |
9800 | else | |
9801 | { | |
9802 | DECL_EXTERNAL (d) = 1; | |
9803 | DECL_NOT_REALLY_EXTERN (d) = 1; | |
9804 | } | |
cd9f6678 | 9805 | cp_finish_decl (d, DECL_INITIAL (d), NULL_TREE, 0); |
5566b478 MS |
9806 | } |
9807 | else if (TREE_CODE (d) == FUNCTION_DECL) | |
9808 | { | |
6bbf1598 MM |
9809 | htab_t saved_local_specializations; |
9810 | ||
9811 | /* Save away the current list, in case we are instantiating one | |
9812 | template from within the body of another. */ | |
9813 | saved_local_specializations = local_specializations; | |
9814 | ||
6dfbb909 | 9815 | /* Set up the list of local specializations. */ |
6dfbb909 MM |
9816 | local_specializations = htab_create (37, |
9817 | htab_hash_pointer, | |
9818 | htab_eq_pointer, | |
9819 | NULL); | |
9820 | ||
558475f0 | 9821 | /* Set up context. */ |
a8f73d4b | 9822 | start_function (NULL_TREE, d, NULL_TREE, SF_PRE_PARSED); |
5566b478 | 9823 | |
f9817201 MM |
9824 | /* We already set up __FUNCTION__, etc., so we don't want to do |
9825 | it again now. */ | |
8f17b5c5 | 9826 | function_name_declared_p = 1; |
f9817201 | 9827 | |
558475f0 MM |
9828 | /* Substitute into the body of the function. */ |
9829 | tsubst_expr (DECL_SAVED_TREE (code_pattern), args, | |
9830 | /*complain=*/1, tmpl); | |
9831 | ||
6dfbb909 MM |
9832 | /* We don't need the local specializations any more. */ |
9833 | htab_delete (local_specializations); | |
6bbf1598 | 9834 | local_specializations = saved_local_specializations; |
6dfbb909 | 9835 | |
4d6abc1c | 9836 | /* Finish the function. */ |
0acf7199 | 9837 | expand_body (finish_function (0)); |
5566b478 MS |
9838 | } |
9839 | ||
971cbc14 MM |
9840 | /* We're not deferring instantiation any more. */ |
9841 | TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d)) = 0; | |
9842 | ||
414ea4aa MM |
9843 | pop_from_top_level (); |
9844 | ||
de22184b | 9845 | out: |
c27be9b9 JM |
9846 | lineno = line; |
9847 | input_filename = file; | |
9848 | ||
5566b478 | 9849 | pop_tinst_level (); |
a28e3c7f | 9850 | |
297a5329 JM |
9851 | timevar_pop (TV_PARSE); |
9852 | ||
a28e3c7f MS |
9853 | return d; |
9854 | } | |
5566b478 | 9855 | |
0aafb128 MM |
9856 | /* Run through the list of templates that we wish we could |
9857 | instantiate, and instantiate any we can. */ | |
9858 | ||
9859 | int | |
9860 | instantiate_pending_templates () | |
9861 | { | |
9862 | tree *t; | |
9863 | int instantiated_something = 0; | |
9864 | int reconsider; | |
9865 | ||
9866 | do | |
9867 | { | |
9868 | reconsider = 0; | |
9869 | ||
9870 | t = &pending_templates; | |
9871 | while (*t) | |
9872 | { | |
0aafb128 MM |
9873 | tree instantiation = TREE_VALUE (*t); |
9874 | ||
3ae18eaf | 9875 | reopen_tinst_level (TREE_PURPOSE (*t)); |
0aafb128 | 9876 | |
2f939d94 | 9877 | if (TYPE_P (instantiation)) |
0aafb128 MM |
9878 | { |
9879 | tree fn; | |
9880 | ||
d0f062fb | 9881 | if (!COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9882 | { |
9883 | instantiate_class_template (instantiation); | |
9884 | if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation)) | |
9885 | for (fn = TYPE_METHODS (instantiation); | |
9886 | fn; | |
9887 | fn = TREE_CHAIN (fn)) | |
9888 | if (! DECL_ARTIFICIAL (fn)) | |
16d53b64 | 9889 | instantiate_decl (fn, /*defer_ok=*/0); |
d0f062fb | 9890 | if (COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9891 | { |
9892 | instantiated_something = 1; | |
9893 | reconsider = 1; | |
9894 | } | |
9895 | } | |
9896 | ||
d0f062fb | 9897 | if (COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9898 | /* If INSTANTIATION has been instantiated, then we don't |
9899 | need to consider it again in the future. */ | |
9900 | *t = TREE_CHAIN (*t); | |
9901 | else | |
9902 | t = &TREE_CHAIN (*t); | |
9903 | } | |
9904 | else | |
9905 | { | |
16d53b64 | 9906 | if (!DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
9907 | && !DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9908 | { | |
16d53b64 MM |
9909 | instantiation = instantiate_decl (instantiation, |
9910 | /*defer_ok=*/0); | |
0aafb128 MM |
9911 | if (DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9912 | { | |
9913 | instantiated_something = 1; | |
9914 | reconsider = 1; | |
9915 | } | |
9916 | } | |
9917 | ||
16d53b64 | 9918 | if (DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
9919 | || DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9920 | /* If INSTANTIATION has been instantiated, then we don't | |
9921 | need to consider it again in the future. */ | |
9922 | *t = TREE_CHAIN (*t); | |
9923 | else | |
9924 | t = &TREE_CHAIN (*t); | |
9925 | } | |
84e5ca0f NS |
9926 | tinst_depth = 0; |
9927 | current_tinst_level = NULL_TREE; | |
0aafb128 MM |
9928 | } |
9929 | template_tail = t; | |
9930 | ||
9931 | /* Go through the things that are template instantiations if we are | |
9932 | using guiding declarations. */ | |
9933 | t = &maybe_templates; | |
9934 | while (*t) | |
9935 | { | |
9936 | tree template; | |
9937 | tree fn; | |
9938 | tree args; | |
9939 | ||
9940 | fn = TREE_VALUE (*t); | |
9941 | ||
9942 | if (DECL_INITIAL (fn)) | |
9943 | /* If the FN is already defined, then it was either already | |
9944 | instantiated or, even though guiding declarations were | |
9945 | allowed, a non-template definition was provided. */ | |
9946 | ; | |
9947 | else | |
9948 | { | |
9949 | template = TREE_PURPOSE (*t); | |
9950 | args = get_bindings (template, fn, NULL_TREE); | |
9951 | fn = instantiate_template (template, args); | |
16d53b64 | 9952 | instantiate_decl (fn, /*defer_ok=*/0); |
0aafb128 MM |
9953 | reconsider = 1; |
9954 | } | |
9955 | ||
9956 | /* Remove this entry from the chain. */ | |
9957 | *t = TREE_CHAIN (*t); | |
9958 | } | |
9959 | maybe_template_tail = t; | |
9960 | } | |
9961 | while (reconsider); | |
9962 | ||
9963 | return instantiated_something; | |
9964 | } | |
9965 | ||
fd74ca0b MM |
9966 | /* Substitute ARGVEC into T, which is a list of initializers for |
9967 | either base class or a non-static data member. The TREE_PURPOSEs | |
9968 | are DECLs, and the TREE_VALUEs are the initializer values. Used by | |
9969 | instantiate_decl. */ | |
4393e105 | 9970 | |
824b9a4c | 9971 | static tree |
fd74ca0b | 9972 | tsubst_initializer_list (t, argvec) |
5566b478 MS |
9973 | tree t, argvec; |
9974 | { | |
9975 | tree first = NULL_TREE; | |
9976 | tree *p = &first; | |
9977 | ||
9978 | for (; t; t = TREE_CHAIN (t)) | |
9979 | { | |
fd74ca0b MM |
9980 | tree decl; |
9981 | tree init; | |
9982 | tree val; | |
9983 | ||
9984 | decl = tsubst_copy (TREE_PURPOSE (t), argvec, /*complain=*/1, | |
9985 | NULL_TREE); | |
9986 | init = tsubst_expr (TREE_VALUE (t), argvec, /*complain=*/1, | |
9987 | NULL_TREE); | |
9988 | ||
9989 | if (!init) | |
9990 | ; | |
9991 | else if (TREE_CODE (init) == TREE_LIST) | |
9992 | for (val = init; val; val = TREE_CHAIN (val)) | |
9993 | TREE_VALUE (val) = convert_from_reference (TREE_VALUE (val)); | |
9994 | else | |
9995 | init = convert_from_reference (init); | |
9996 | ||
9997 | *p = build_tree_list (decl, init); | |
5566b478 MS |
9998 | p = &TREE_CHAIN (*p); |
9999 | } | |
10000 | return first; | |
10001 | } | |
10002 | ||
61a127b3 MM |
10003 | /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */ |
10004 | ||
10005 | static void | |
10006 | set_current_access_from_decl (decl) | |
10007 | tree decl; | |
10008 | { | |
10009 | if (TREE_PRIVATE (decl)) | |
10010 | current_access_specifier = access_private_node; | |
10011 | else if (TREE_PROTECTED (decl)) | |
10012 | current_access_specifier = access_protected_node; | |
10013 | else | |
10014 | current_access_specifier = access_public_node; | |
10015 | } | |
10016 | ||
dbfe2124 MM |
10017 | /* Instantiate an enumerated type. TAG is the template type, NEWTAG |
10018 | is the instantiation (which should have been created with | |
10019 | start_enum) and ARGS are the template arguments to use. */ | |
b87692e5 | 10020 | |
dbfe2124 MM |
10021 | static void |
10022 | tsubst_enum (tag, newtag, args) | |
10023 | tree tag; | |
10024 | tree newtag; | |
10025 | tree args; | |
b87692e5 | 10026 | { |
dbfe2124 | 10027 | tree e; |
b87692e5 MS |
10028 | |
10029 | for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e)) | |
10030 | { | |
61a127b3 | 10031 | tree value; |
58595203 | 10032 | |
61a127b3 MM |
10033 | /* Note that in a template enum, the TREE_VALUE is the |
10034 | CONST_DECL, not the corresponding INTEGER_CST. */ | |
10035 | value = tsubst_expr (DECL_INITIAL (TREE_VALUE (e)), | |
4393e105 MM |
10036 | args, /*complain=*/1, |
10037 | NULL_TREE); | |
61a127b3 MM |
10038 | |
10039 | /* Give this enumeration constant the correct access. */ | |
10040 | set_current_access_from_decl (TREE_VALUE (e)); | |
10041 | ||
10042 | /* Actually build the enumerator itself. */ | |
58595203 | 10043 | build_enumerator (TREE_PURPOSE (e), value, newtag); |
dbfe2124 | 10044 | } |
b3d5a58b | 10045 | |
dbfe2124 | 10046 | finish_enum (newtag); |
92777ce4 NS |
10047 | DECL_SOURCE_LINE (TYPE_NAME (newtag)) = DECL_SOURCE_LINE (TYPE_NAME (tag)); |
10048 | DECL_SOURCE_FILE (TYPE_NAME (newtag)) = DECL_SOURCE_FILE (TYPE_NAME (tag)); | |
b87692e5 | 10049 | } |
36a117a5 | 10050 | |
1f6e1acc AS |
10051 | /* DECL is a FUNCTION_DECL that is a template specialization. Return |
10052 | its type -- but without substituting the innermost set of template | |
10053 | arguments. So, innermost set of template parameters will appear in | |
10054 | the type. If CONTEXTP is non-NULL, then the partially substituted | |
10055 | DECL_CONTEXT (if any) will also be filled in. Similarly, TPARMSP | |
10056 | will be filled in with the substituted template parameters, if it | |
10057 | is non-NULL. */ | |
10058 | ||
10059 | tree | |
10060 | get_mostly_instantiated_function_type (decl, contextp, tparmsp) | |
10061 | tree decl; | |
10062 | tree *contextp; | |
10063 | tree *tparmsp; | |
10064 | { | |
10065 | tree context = NULL_TREE; | |
10066 | tree fn_type; | |
10067 | tree tmpl; | |
10068 | tree targs; | |
10069 | tree tparms; | |
10070 | int parm_depth; | |
10071 | ||
10072 | tmpl = most_general_template (DECL_TI_TEMPLATE (decl)); | |
10073 | targs = DECL_TI_ARGS (decl); | |
10074 | tparms = DECL_TEMPLATE_PARMS (tmpl); | |
10075 | parm_depth = TMPL_PARMS_DEPTH (tparms); | |
10076 | ||
10077 | /* There should be as many levels of arguments as there are levels | |
10078 | of parameters. */ | |
10079 | my_friendly_assert (parm_depth == TMPL_ARGS_DEPTH (targs), 0); | |
10080 | ||
10081 | fn_type = TREE_TYPE (tmpl); | |
10082 | if (DECL_STATIC_FUNCTION_P (decl)) | |
10083 | context = DECL_CONTEXT (decl); | |
10084 | ||
10085 | if (parm_depth == 1) | |
10086 | /* No substitution is necessary. */ | |
10087 | ; | |
10088 | else | |
10089 | { | |
10090 | int i; | |
10091 | tree partial_args; | |
10092 | ||
10093 | /* Replace the innermost level of the TARGS with NULL_TREEs to | |
dc957d14 | 10094 | let tsubst know not to substitute for those parameters. */ |
1f6e1acc AS |
10095 | partial_args = make_tree_vec (TREE_VEC_LENGTH (targs)); |
10096 | for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i) | |
10097 | SET_TMPL_ARGS_LEVEL (partial_args, i, | |
10098 | TMPL_ARGS_LEVEL (targs, i)); | |
10099 | SET_TMPL_ARGS_LEVEL (partial_args, | |
10100 | TMPL_ARGS_DEPTH (targs), | |
10101 | make_tree_vec (DECL_NTPARMS (tmpl))); | |
10102 | ||
10103 | /* Now, do the (partial) substitution to figure out the | |
10104 | appropriate function type. */ | |
10105 | fn_type = tsubst (fn_type, partial_args, /*complain=*/1, NULL_TREE); | |
10106 | if (DECL_STATIC_FUNCTION_P (decl)) | |
10107 | context = tsubst (context, partial_args, /*complain=*/1, NULL_TREE); | |
10108 | ||
10109 | /* Substitute into the template parameters to obtain the real | |
10110 | innermost set of parameters. This step is important if the | |
10111 | innermost set of template parameters contains value | |
10112 | parameters whose types depend on outer template parameters. */ | |
10113 | TREE_VEC_LENGTH (partial_args)--; | |
10114 | tparms = tsubst_template_parms (tparms, partial_args, /*complain=*/1); | |
10115 | } | |
10116 | ||
10117 | if (contextp) | |
10118 | *contextp = context; | |
10119 | if (tparmsp) | |
10120 | *tparmsp = tparms; | |
10121 | ||
10122 | return fn_type; | |
10123 | } | |
669ec2b4 JM |
10124 | |
10125 | /* Set the DECL_ASSEMBLER_NAME for DECL, which is a FUNCTION_DECL that | |
10126 | is either an instantiation or specialization of a template | |
10127 | function. */ | |
10128 | ||
10129 | static void | |
10130 | set_mangled_name_for_template_decl (decl) | |
10131 | tree decl; | |
10132 | { | |
10133 | tree context = NULL_TREE; | |
10134 | tree fn_type; | |
10135 | tree ret_type; | |
10136 | tree parm_types; | |
10137 | tree tparms; | |
10138 | tree targs; | |
10139 | ||
10140 | my_friendly_assert (TREE_CODE (decl) == FUNCTION_DECL, 0); | |
10141 | my_friendly_assert (DECL_TEMPLATE_INFO (decl) != NULL_TREE, 0); | |
10142 | ||
10143 | /* Under the new ABI, we don't need special machinery. */ | |
10144 | if (flag_new_abi) | |
10145 | { | |
10146 | set_mangled_name_for_decl (decl); | |
10147 | return; | |
10148 | } | |
10149 | ||
10150 | /* The names of template functions must be mangled so as to indicate | |
10151 | what template is being specialized with what template arguments. | |
10152 | For example, each of the following three functions must get | |
10153 | different mangled names: | |
10154 | ||
10155 | void f(int); | |
10156 | template <> void f<7>(int); | |
10157 | template <> void f<8>(int); */ | |
10158 | ||
10159 | targs = DECL_TI_ARGS (decl); | |
10160 | if (uses_template_parms (targs)) | |
10161 | /* This DECL is for a partial instantiation. There's no need to | |
10162 | mangle the name of such an entity. */ | |
10163 | return; | |
10164 | ||
10165 | /* We now compute the PARMS and RET_TYPE to give to | |
10166 | build_decl_overload_real. The PARMS and RET_TYPE are the | |
10167 | parameter and return types of the template, after all but the | |
10168 | innermost template arguments have been substituted, not the | |
10169 | parameter and return types of the function DECL. For example, | |
10170 | given: | |
10171 | ||
10172 | template <class T> T f(T); | |
10173 | ||
10174 | both PARMS and RET_TYPE should be `T' even if DECL is `int f(int)'. | |
10175 | A more subtle example is: | |
10176 | ||
10177 | template <class T> struct S { template <class U> void f(T, U); } | |
10178 | ||
10179 | Here, if DECL is `void S<int>::f(int, double)', PARMS should be | |
10180 | {int, U}. Thus, the args that we want to subsitute into the | |
10181 | return and parameter type for the function are those in TARGS, | |
10182 | with the innermost level omitted. */ | |
10183 | fn_type = get_mostly_instantiated_function_type (decl, &context, &tparms); | |
10184 | ||
10185 | /* Now, get the innermost parameters and arguments, and figure out | |
10186 | the parameter and return types. */ | |
10187 | tparms = INNERMOST_TEMPLATE_PARMS (tparms); | |
10188 | targs = INNERMOST_TEMPLATE_ARGS (targs); | |
10189 | ret_type = TREE_TYPE (fn_type); | |
10190 | parm_types = TYPE_ARG_TYPES (fn_type); | |
10191 | ||
10192 | /* For a static member function, we generate a fake `this' pointer, | |
10193 | for the purposes of mangling. This indicates of which class the | |
10194 | function is a member. Because of: | |
10195 | ||
10196 | [class.static] | |
10197 | ||
10198 | There shall not be a static and a nonstatic member function | |
10199 | with the same name and the same parameter types | |
10200 | ||
10201 | we don't have to worry that this will result in a clash with a | |
10202 | non-static member function. */ | |
10203 | if (DECL_STATIC_FUNCTION_P (decl)) | |
10204 | parm_types = hash_tree_chain (build_pointer_type (context), parm_types); | |
10205 | ||
10206 | /* There should be the same number of template parameters as | |
10207 | template arguments. */ | |
10208 | my_friendly_assert (TREE_VEC_LENGTH (tparms) == TREE_VEC_LENGTH (targs), | |
10209 | 0); | |
10210 | ||
10211 | /* Actually set the DECL_ASSEMBLER_NAME. */ | |
10212 | DECL_ASSEMBLER_NAME (decl) | |
10213 | = build_decl_overload_real (decl, parm_types, ret_type, | |
10214 | tparms, targs, | |
10215 | DECL_FUNCTION_MEMBER_P (decl) | |
10216 | + DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)); | |
10217 | } | |
cb753e49 GDR |
10218 | |
10219 | /* Return truthvalue if we're processing a template different from | |
dc957d14 | 10220 | the last one involved in diagnostics. */ |
cb753e49 GDR |
10221 | int |
10222 | problematic_instantiation_changed () | |
10223 | { | |
10224 | return last_template_error_tick != tinst_level_tick; | |
10225 | } | |
10226 | ||
10227 | /* Remember current template involved in diagnostics. */ | |
10228 | void | |
10229 | record_last_problematic_instantiation () | |
10230 | { | |
10231 | last_template_error_tick = tinst_level_tick; | |
10232 | } | |
10233 | ||
10234 | tree | |
10235 | current_instantiation () | |
10236 | { | |
10237 | return current_tinst_level; | |
10238 | } |