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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" |
6dfbb909 | 46 | #include "hashtab.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 MS |
53 | |
54 | extern int lineno; | |
55 | extern char *input_filename; | |
8d08fdba | 56 | |
0aafb128 MM |
57 | /* The PENDING_TEMPLATES is a TREE_LIST of templates whose |
58 | instantiations have been deferred, either because their definitions | |
59 | were not yet available, or because we were putting off doing the | |
60 | work. The TREE_PURPOSE of each entry is a SRCLOC indicating where | |
61 | the instantiate request occurred; the TREE_VALUE is a either a DECL | |
62 | (for a function or static data member), or a TYPE (for a class) | |
63 | indicating what we are hoping to instantiate. */ | |
64 | static tree pending_templates; | |
5566b478 MS |
65 | static tree *template_tail = &pending_templates; |
66 | ||
0aafb128 | 67 | static tree maybe_templates; |
73aad9b9 JM |
68 | static tree *maybe_template_tail = &maybe_templates; |
69 | ||
67ffc812 | 70 | int processing_template_parmlist; |
386b8a85 JM |
71 | static int template_header_count; |
72 | ||
75650646 | 73 | static tree saved_trees; |
3dcaad8b MM |
74 | static varray_type inline_parm_levels; |
75 | static size_t inline_parm_levels_used; | |
75650646 | 76 | |
6dfbb909 MM |
77 | /* A map from local variable declarations in the body of the template |
78 | presently being instantiated to the corresponding instantiated | |
79 | local variables. */ | |
80 | static htab_t local_specializations; | |
81 | ||
8d08fdba MS |
82 | #define obstack_chunk_alloc xmalloc |
83 | #define obstack_chunk_free free | |
84 | ||
830bfa74 MM |
85 | #define UNIFY_ALLOW_NONE 0 |
86 | #define UNIFY_ALLOW_MORE_CV_QUAL 1 | |
87 | #define UNIFY_ALLOW_LESS_CV_QUAL 2 | |
88 | #define UNIFY_ALLOW_DERIVED 4 | |
161c12b0 | 89 | #define UNIFY_ALLOW_INTEGER 8 |
830bfa74 | 90 | |
4393e105 MM |
91 | #define GTB_VIA_VIRTUAL 1 /* The base class we are examining is |
92 | virtual, or a base class of a virtual | |
93 | base. */ | |
94 | #define GTB_IGNORE_TYPE 2 /* We don't need to try to unify the current | |
95 | type with the desired type. */ | |
96 | ||
158991b7 | 97 | static int resolve_overloaded_unification PARAMS ((tree, tree, tree, tree, |
4393e105 | 98 | unification_kind_t, int)); |
158991b7 | 99 | static int try_one_overload PARAMS ((tree, tree, tree, tree, tree, |
4393e105 | 100 | unification_kind_t, int)); |
158991b7 KG |
101 | static int unify PARAMS ((tree, tree, tree, tree, int)); |
102 | static void add_pending_template PARAMS ((tree)); | |
103 | static int push_tinst_level PARAMS ((tree)); | |
104 | static tree classtype_mangled_name PARAMS ((tree)); | |
105 | static char *mangle_class_name_for_template PARAMS ((char *, tree, tree)); | |
106 | static tree tsubst_expr_values PARAMS ((tree, tree)); | |
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, |
4393e105 | 116 | int, unification_kind_t, 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 KG |
122 | static tree get_bindings_overload PARAMS ((tree, tree, tree)); |
123 | static int for_each_template_parm PARAMS ((tree, tree_fn_t, void*)); | |
124 | static tree build_template_parm_index PARAMS ((int, int, int, tree, tree)); | |
125 | static int inline_needs_template_parms PARAMS ((tree)); | |
126 | static void push_inline_template_parms_recursive PARAMS ((tree, int)); | |
127 | static tree retrieve_specialization PARAMS ((tree, tree)); | |
6dfbb909 | 128 | static tree retrieve_local_specialization PARAMS ((tree)); |
158991b7 | 129 | static tree register_specialization PARAMS ((tree, tree, tree)); |
6dfbb909 | 130 | static tree register_local_specialization PARAMS ((tree, tree)); |
158991b7 KG |
131 | static int unregister_specialization PARAMS ((tree, tree)); |
132 | static tree reduce_template_parm_level PARAMS ((tree, tree, int)); | |
133 | static tree build_template_decl PARAMS ((tree, tree)); | |
134 | static int mark_template_parm PARAMS ((tree, void *)); | |
135 | static tree tsubst_friend_function PARAMS ((tree, tree)); | |
136 | static tree tsubst_friend_class PARAMS ((tree, tree)); | |
137 | static tree get_bindings_real PARAMS ((tree, tree, tree, int)); | |
138 | static int template_decl_level PARAMS ((tree)); | |
139 | static tree maybe_get_template_decl_from_type_decl PARAMS ((tree)); | |
140 | static int check_cv_quals_for_unify PARAMS ((int, tree, tree)); | |
141 | static tree tsubst_template_arg_vector PARAMS ((tree, tree, int)); | |
142 | static tree tsubst_template_parms PARAMS ((tree, tree, int)); | |
143 | static void regenerate_decl_from_template PARAMS ((tree, tree)); | |
144 | static tree most_specialized PARAMS ((tree, tree, tree)); | |
145 | static tree most_specialized_class PARAMS ((tree, tree)); | |
146 | static void set_mangled_name_for_template_decl PARAMS ((tree)); | |
147 | static int template_class_depth_real PARAMS ((tree, int)); | |
148 | static tree tsubst_aggr_type PARAMS ((tree, tree, int, tree, int)); | |
149 | static tree tsubst_decl PARAMS ((tree, tree, tree, tree)); | |
150 | static tree tsubst_arg_types PARAMS ((tree, tree, int, tree)); | |
151 | static tree tsubst_function_type PARAMS ((tree, tree, int, tree)); | |
152 | static void check_specialization_scope PARAMS ((void)); | |
153 | static tree process_partial_specialization PARAMS ((tree)); | |
154 | static void set_current_access_from_decl PARAMS ((tree)); | |
155 | static void check_default_tmpl_args PARAMS ((tree, tree, int, int)); | |
156 | static tree tsubst_call_declarator_parms PARAMS ((tree, tree, int, tree)); | |
157 | static tree get_template_base_recursive PARAMS ((tree, tree, | |
4393e105 | 158 | tree, tree, tree, int)); |
158991b7 KG |
159 | static tree get_template_base PARAMS ((tree, tree, tree, tree)); |
160 | static tree try_class_unification PARAMS ((tree, tree, tree, tree)); | |
161 | static int coerce_template_template_parms PARAMS ((tree, tree, int, | |
4393e105 | 162 | tree, tree)); |
158991b7 KG |
163 | static tree determine_specialization PARAMS ((tree, tree, tree *, int)); |
164 | static int template_args_equal PARAMS ((tree, tree)); | |
165 | static void print_template_context PARAMS ((int)); | |
166 | static void tsubst_default_arguments PARAMS ((tree)); | |
167 | static tree for_each_template_parm_r PARAMS ((tree *, int *, void *)); | |
db9b2174 | 168 | static tree instantiate_clone PARAMS ((tree, tree)); |
36a117a5 | 169 | |
9cd64686 MM |
170 | /* Called once to initialize pt.c. */ |
171 | ||
172 | void | |
173 | init_pt () | |
174 | { | |
175 | ggc_add_tree_root (&pending_templates, 1); | |
176 | ggc_add_tree_root (&maybe_templates, 1); | |
177 | ggc_add_tree_root (&saved_trees, 1); | |
178 | } | |
179 | ||
e1467ff2 MM |
180 | /* Do any processing required when DECL (a member template declaration |
181 | using TEMPLATE_PARAMETERS as its innermost parameter list) is | |
182 | finished. Returns the TEMPLATE_DECL corresponding to DECL, unless | |
183 | it is a specialization, in which case the DECL itself is returned. */ | |
184 | ||
185 | tree | |
61a127b3 | 186 | finish_member_template_decl (decl) |
e1467ff2 MM |
187 | tree decl; |
188 | { | |
93cdc044 JM |
189 | if (decl == NULL_TREE || decl == void_type_node) |
190 | return NULL_TREE; | |
3ddfb0e6 MM |
191 | else if (decl == error_mark_node) |
192 | /* By returning NULL_TREE, the parser will just ignore this | |
193 | declaration. We have already issued the error. */ | |
194 | return NULL_TREE; | |
93cdc044 JM |
195 | else if (TREE_CODE (decl) == TREE_LIST) |
196 | { | |
5f311aec | 197 | /* Assume that the class is the only declspec. */ |
93cdc044 | 198 | decl = TREE_VALUE (decl); |
8d019cef | 199 | if (IS_AGGR_TYPE (decl) && CLASSTYPE_TEMPLATE_INFO (decl) |
370af2d5 | 200 | && ! CLASSTYPE_TEMPLATE_SPECIALIZATION (decl)) |
93cdc044 JM |
201 | { |
202 | tree tmpl = CLASSTYPE_TI_TEMPLATE (decl); | |
203 | check_member_template (tmpl); | |
204 | return tmpl; | |
205 | } | |
8d019cef | 206 | return NULL_TREE; |
93cdc044 | 207 | } |
07c88314 MM |
208 | else if (TREE_CODE (decl) == FIELD_DECL) |
209 | cp_error ("data member `%D' cannot be a member template", decl); | |
a1da6cba | 210 | else if (DECL_TEMPLATE_INFO (decl)) |
e1467ff2 | 211 | { |
a1da6cba MM |
212 | if (!DECL_TEMPLATE_SPECIALIZATION (decl)) |
213 | { | |
214 | check_member_template (DECL_TI_TEMPLATE (decl)); | |
215 | return DECL_TI_TEMPLATE (decl); | |
216 | } | |
217 | else | |
218 | return decl; | |
219 | } | |
220 | else | |
8251199e | 221 | cp_error ("invalid member template declaration `%D'", decl); |
e1467ff2 | 222 | |
a1da6cba | 223 | return error_mark_node; |
f84b4be9 | 224 | } |
e1467ff2 | 225 | |
f84b4be9 JM |
226 | /* Returns the template nesting level of the indicated class TYPE. |
227 | ||
228 | For example, in: | |
229 | template <class T> | |
230 | struct A | |
231 | { | |
232 | template <class U> | |
233 | struct B {}; | |
234 | }; | |
235 | ||
39c01e4c MM |
236 | A<T>::B<U> has depth two, while A<T> has depth one. |
237 | Both A<T>::B<int> and A<int>::B<U> have depth one, if | |
238 | COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not | |
239 | specializations. | |
240 | ||
241 | This function is guaranteed to return 0 if passed NULL_TREE so | |
242 | that, for example, `template_class_depth (current_class_type)' is | |
243 | always safe. */ | |
f84b4be9 | 244 | |
e9659ab0 | 245 | static int |
39c01e4c | 246 | template_class_depth_real (type, count_specializations) |
f84b4be9 | 247 | tree type; |
39c01e4c | 248 | int count_specializations; |
f84b4be9 | 249 | { |
93cdc044 | 250 | int depth; |
f84b4be9 | 251 | |
2c73f9f5 | 252 | for (depth = 0; |
ed44da02 MM |
253 | type && TREE_CODE (type) != NAMESPACE_DECL; |
254 | type = (TREE_CODE (type) == FUNCTION_DECL) | |
4f1c5b7d | 255 | ? CP_DECL_CONTEXT (type) : TYPE_CONTEXT (type)) |
ed44da02 MM |
256 | { |
257 | if (TREE_CODE (type) != FUNCTION_DECL) | |
258 | { | |
259 | if (CLASSTYPE_TEMPLATE_INFO (type) | |
260 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type)) | |
261 | && ((count_specializations | |
370af2d5 | 262 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (type)) |
ed44da02 MM |
263 | || uses_template_parms (CLASSTYPE_TI_ARGS (type)))) |
264 | ++depth; | |
265 | } | |
266 | else | |
267 | { | |
268 | if (DECL_TEMPLATE_INFO (type) | |
269 | && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type)) | |
270 | && ((count_specializations | |
271 | && DECL_TEMPLATE_SPECIALIZATION (type)) | |
272 | || uses_template_parms (DECL_TI_ARGS (type)))) | |
273 | ++depth; | |
274 | } | |
275 | } | |
f84b4be9 JM |
276 | |
277 | return depth; | |
e1467ff2 | 278 | } |
98c1c668 | 279 | |
39c01e4c MM |
280 | /* Returns the template nesting level of the indicated class TYPE. |
281 | Like template_class_depth_real, but instantiations do not count in | |
282 | the depth. */ | |
283 | ||
284 | int | |
285 | template_class_depth (type) | |
286 | tree type; | |
287 | { | |
288 | return template_class_depth_real (type, /*count_specializations=*/0); | |
289 | } | |
290 | ||
cae40af6 JM |
291 | /* Returns 1 if processing DECL as part of do_pending_inlines |
292 | needs us to push template parms. */ | |
293 | ||
294 | static int | |
295 | inline_needs_template_parms (decl) | |
296 | tree decl; | |
297 | { | |
298 | if (! DECL_TEMPLATE_INFO (decl)) | |
299 | return 0; | |
f84b4be9 | 300 | |
36a117a5 | 301 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl))) |
cae40af6 JM |
302 | > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl))); |
303 | } | |
304 | ||
305 | /* Subroutine of maybe_begin_member_template_processing. | |
306 | Push the template parms in PARMS, starting from LEVELS steps into the | |
307 | chain, and ending at the beginning, since template parms are listed | |
308 | innermost first. */ | |
309 | ||
310 | static void | |
311 | push_inline_template_parms_recursive (parmlist, levels) | |
312 | tree parmlist; | |
313 | int levels; | |
314 | { | |
315 | tree parms = TREE_VALUE (parmlist); | |
316 | int i; | |
317 | ||
318 | if (levels > 1) | |
319 | push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1); | |
786b5245 | 320 | |
98c1c668 | 321 | ++processing_template_decl; |
cae40af6 | 322 | current_template_parms |
98c1c668 JM |
323 | = tree_cons (build_int_2 (0, processing_template_decl), |
324 | parms, current_template_parms); | |
cae40af6 JM |
325 | TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1; |
326 | ||
786b5245 | 327 | pushlevel (0); |
98c1c668 JM |
328 | for (i = 0; i < TREE_VEC_LENGTH (parms); ++i) |
329 | { | |
786b5245 | 330 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
2f939d94 | 331 | my_friendly_assert (DECL_P (parm), 0); |
cae40af6 | 332 | |
98c1c668 JM |
333 | switch (TREE_CODE (parm)) |
334 | { | |
786b5245 | 335 | case TYPE_DECL: |
73b0fce8 | 336 | case TEMPLATE_DECL: |
98c1c668 JM |
337 | pushdecl (parm); |
338 | break; | |
786b5245 MM |
339 | |
340 | case PARM_DECL: | |
341 | { | |
fc03edb3 MM |
342 | /* Make a CONST_DECL as is done in process_template_parm. |
343 | It is ugly that we recreate this here; the original | |
344 | version built in process_template_parm is no longer | |
345 | available. */ | |
786b5245 MM |
346 | tree decl = build_decl (CONST_DECL, DECL_NAME (parm), |
347 | TREE_TYPE (parm)); | |
fc03edb3 | 348 | SET_DECL_ARTIFICIAL (decl); |
786b5245 | 349 | DECL_INITIAL (decl) = DECL_INITIAL (parm); |
cd9f6678 | 350 | SET_DECL_TEMPLATE_PARM_P (decl); |
786b5245 MM |
351 | pushdecl (decl); |
352 | } | |
cae40af6 | 353 | break; |
786b5245 | 354 | |
98c1c668 JM |
355 | default: |
356 | my_friendly_abort (0); | |
357 | } | |
358 | } | |
359 | } | |
360 | ||
cae40af6 JM |
361 | /* Restore the template parameter context for a member template or |
362 | a friend template defined in a class definition. */ | |
363 | ||
364 | void | |
365 | maybe_begin_member_template_processing (decl) | |
366 | tree decl; | |
367 | { | |
368 | tree parms; | |
3dcaad8b | 369 | int levels = 0; |
cae40af6 | 370 | |
3dcaad8b MM |
371 | if (inline_needs_template_parms (decl)) |
372 | { | |
373 | parms = DECL_TEMPLATE_PARMS (most_general_template (decl)); | |
374 | levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl; | |
cae40af6 | 375 | |
3dcaad8b MM |
376 | if (DECL_TEMPLATE_SPECIALIZATION (decl)) |
377 | { | |
378 | --levels; | |
379 | parms = TREE_CHAIN (parms); | |
380 | } | |
cae40af6 | 381 | |
3dcaad8b | 382 | push_inline_template_parms_recursive (parms, levels); |
cae40af6 JM |
383 | } |
384 | ||
3dcaad8b MM |
385 | /* Remember how many levels of template parameters we pushed so that |
386 | we can pop them later. */ | |
387 | if (!inline_parm_levels) | |
388 | VARRAY_INT_INIT (inline_parm_levels, 4, "inline_parm_levels"); | |
389 | if (inline_parm_levels_used == inline_parm_levels->num_elements) | |
390 | VARRAY_GROW (inline_parm_levels, 2 * inline_parm_levels_used); | |
391 | VARRAY_INT (inline_parm_levels, inline_parm_levels_used) = levels; | |
392 | ++inline_parm_levels_used; | |
cae40af6 JM |
393 | } |
394 | ||
98c1c668 JM |
395 | /* Undo the effects of begin_member_template_processing. */ |
396 | ||
397 | void | |
b370501f | 398 | maybe_end_member_template_processing () |
98c1c668 | 399 | { |
3dcaad8b MM |
400 | int i; |
401 | ||
402 | if (!inline_parm_levels_used) | |
98c1c668 JM |
403 | return; |
404 | ||
3dcaad8b MM |
405 | --inline_parm_levels_used; |
406 | for (i = 0; | |
407 | i < VARRAY_INT (inline_parm_levels, inline_parm_levels_used); | |
408 | ++i) | |
cae40af6 JM |
409 | { |
410 | --processing_template_decl; | |
411 | current_template_parms = TREE_CHAIN (current_template_parms); | |
412 | poplevel (0, 0, 0); | |
413 | } | |
98c1c668 JM |
414 | } |
415 | ||
cae40af6 | 416 | /* Returns non-zero iff T is a member template function. We must be |
f84b4be9 | 417 | careful as in |
75650646 MM |
418 | |
419 | template <class T> class C { void f(); } | |
420 | ||
421 | Here, f is a template function, and a member, but not a member | |
422 | template. This function does not concern itself with the origin of | |
423 | T, only its present state. So if we have | |
424 | ||
425 | template <class T> class C { template <class U> void f(U); } | |
426 | ||
427 | then neither C<int>::f<char> nor C<T>::f<double> is considered | |
f181d4ae MM |
428 | to be a member template. But, `template <class U> void |
429 | C<int>::f(U)' is considered a member template. */ | |
98c1c668 | 430 | |
cae40af6 JM |
431 | int |
432 | is_member_template (t) | |
98c1c668 JM |
433 | tree t; |
434 | { | |
f181d4ae | 435 | if (!DECL_FUNCTION_TEMPLATE_P (t)) |
75650646 | 436 | /* Anything that isn't a function or a template function is |
aa5f3bad MM |
437 | certainly not a member template. */ |
438 | return 0; | |
439 | ||
cae40af6 | 440 | /* A local class can't have member templates. */ |
4f1c5b7d | 441 | if (decl_function_context (t)) |
cae40af6 JM |
442 | return 0; |
443 | ||
f181d4ae | 444 | return (DECL_FUNCTION_MEMBER_P (DECL_TEMPLATE_RESULT (t)) |
f84b4be9 JM |
445 | /* If there are more levels of template parameters than |
446 | there are template classes surrounding the declaration, | |
447 | then we have a member template. */ | |
f181d4ae | 448 | && (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
4f1c5b7d | 449 | template_class_depth (DECL_CONTEXT (t)))); |
f84b4be9 | 450 | } |
98c1c668 | 451 | |
ba4f4e5d | 452 | #if 0 /* UNUSED */ |
2ee4e084 MM |
453 | /* Returns non-zero iff T is a member template class. See |
454 | is_member_template for a description of what precisely constitutes | |
455 | a member template. */ | |
456 | ||
457 | int | |
458 | is_member_template_class (t) | |
459 | tree t; | |
460 | { | |
461 | if (!DECL_CLASS_TEMPLATE_P (t)) | |
462 | /* Anything that isn't a class template, is certainly not a member | |
463 | template. */ | |
464 | return 0; | |
465 | ||
466 | if (!DECL_CLASS_SCOPE_P (t)) | |
467 | /* Anything whose context isn't a class type is surely not a | |
468 | member template. */ | |
469 | return 0; | |
470 | ||
471 | /* If there are more levels of template parameters than there are | |
472 | template classes surrounding the declaration, then we have a | |
473 | member template. */ | |
36a117a5 | 474 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
2ee4e084 MM |
475 | template_class_depth (DECL_CONTEXT (t))); |
476 | } | |
ba4f4e5d | 477 | #endif |
2ee4e084 | 478 | |
36a117a5 MM |
479 | /* Return a new template argument vector which contains all of ARGS, |
480 | but has as its innermost set of arguments the EXTRA_ARGS. The | |
481 | resulting vector will be built on a temporary obstack, and so must | |
482 | be explicitly copied to the permanent obstack, if required. */ | |
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 MS |
540 | |
541 | /* We've got a template header coming up; push to a new level for storing | |
542 | the parms. */ | |
8d08fdba | 543 | |
8d08fdba MS |
544 | void |
545 | begin_template_parm_list () | |
546 | { | |
6757edfe MM |
547 | /* We use a non-tag-transparent scope here, which causes pushtag to |
548 | put tags in this scope, rather than in the enclosing class or | |
549 | namespace scope. This is the right thing, since we want | |
550 | TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a | |
551 | global template class, push_template_decl handles putting the | |
552 | TEMPLATE_DECL into top-level scope. For a nested template class, | |
553 | e.g.: | |
554 | ||
555 | template <class T> struct S1 { | |
556 | template <class T> struct S2 {}; | |
557 | }; | |
558 | ||
559 | pushtag contains special code to call pushdecl_with_scope on the | |
560 | TEMPLATE_DECL for S2. */ | |
74b846e0 | 561 | begin_scope (sk_template_parms); |
5156628f | 562 | ++processing_template_decl; |
67ffc812 | 563 | ++processing_template_parmlist; |
386b8a85 JM |
564 | note_template_header (0); |
565 | } | |
566 | ||
6c30752f MM |
567 | /* This routine is called when a specialization is declared. If it is |
568 | illegal to declare a specialization here, an error is reported. */ | |
569 | ||
e9659ab0 | 570 | static void |
6c30752f MM |
571 | check_specialization_scope () |
572 | { | |
573 | tree scope = current_scope (); | |
3ddfb0e6 | 574 | |
6c30752f MM |
575 | /* [temp.expl.spec] |
576 | ||
577 | An explicit specialization shall be declared in the namespace of | |
578 | which the template is a member, or, for member templates, in the | |
579 | namespace of which the enclosing class or enclosing class | |
580 | template is a member. An explicit specialization of a member | |
581 | function, member class or static data member of a class template | |
582 | shall be declared in the namespace of which the class template | |
583 | is a member. */ | |
584 | if (scope && TREE_CODE (scope) != NAMESPACE_DECL) | |
8251199e | 585 | cp_error ("explicit specialization in non-namespace scope `%D'", |
6c30752f | 586 | scope); |
3ddfb0e6 | 587 | |
6c30752f MM |
588 | /* [temp.expl.spec] |
589 | ||
590 | In an explicit specialization declaration for a member of a class | |
591 | template or a member template that appears in namespace scope, | |
592 | the member template and some of its enclosing class templates may | |
593 | remain unspecialized, except that the declaration shall not | |
594 | explicitly specialize a class member template if its enclosing | |
595 | class templates are not explicitly specialized as well. */ | |
596 | if (current_template_parms) | |
fd4de5ff | 597 | cp_error ("enclosing class templates are not explicitly specialized"); |
6c30752f MM |
598 | } |
599 | ||
386b8a85 JM |
600 | /* We've just seen template <>. */ |
601 | ||
602 | void | |
603 | begin_specialization () | |
604 | { | |
74b846e0 | 605 | begin_scope (sk_template_spec); |
386b8a85 | 606 | note_template_header (1); |
6c30752f | 607 | check_specialization_scope (); |
386b8a85 JM |
608 | } |
609 | ||
386b8a85 JM |
610 | /* Called at then end of processing a declaration preceeded by |
611 | template<>. */ | |
612 | ||
613 | void | |
614 | end_specialization () | |
615 | { | |
74b846e0 | 616 | finish_scope (); |
386b8a85 JM |
617 | reset_specialization (); |
618 | } | |
619 | ||
386b8a85 JM |
620 | /* Any template <>'s that we have seen thus far are not referring to a |
621 | function specialization. */ | |
622 | ||
623 | void | |
624 | reset_specialization () | |
625 | { | |
626 | processing_specialization = 0; | |
627 | template_header_count = 0; | |
628 | } | |
629 | ||
386b8a85 JM |
630 | /* We've just seen a template header. If SPECIALIZATION is non-zero, |
631 | it was of the form template <>. */ | |
632 | ||
4966381a | 633 | static void |
386b8a85 JM |
634 | note_template_header (specialization) |
635 | int specialization; | |
636 | { | |
637 | processing_specialization = specialization; | |
638 | template_header_count++; | |
639 | } | |
640 | ||
75650646 | 641 | /* We're beginning an explicit instantiation. */ |
386b8a85 | 642 | |
75650646 MM |
643 | void |
644 | begin_explicit_instantiation () | |
386b8a85 | 645 | { |
75650646 MM |
646 | ++processing_explicit_instantiation; |
647 | } | |
386b8a85 | 648 | |
386b8a85 | 649 | |
75650646 MM |
650 | void |
651 | end_explicit_instantiation () | |
652 | { | |
653 | my_friendly_assert(processing_explicit_instantiation > 0, 0); | |
654 | --processing_explicit_instantiation; | |
655 | } | |
386b8a85 | 656 | |
36a117a5 MM |
657 | /* The TYPE is being declared. If it is a template type, that means it |
658 | is a partial specialization. Do appropriate error-checking. */ | |
659 | ||
660 | void | |
661 | maybe_process_partial_specialization (type) | |
662 | tree type; | |
663 | { | |
664 | if (IS_AGGR_TYPE (type) && CLASSTYPE_USE_TEMPLATE (type)) | |
665 | { | |
666 | if (CLASSTYPE_IMPLICIT_INSTANTIATION (type) | |
d0f062fb | 667 | && !COMPLETE_TYPE_P (type)) |
36a117a5 | 668 | { |
700466c2 JM |
669 | if (current_namespace |
670 | != decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type))) | |
671 | { | |
672 | cp_pedwarn ("specializing `%#T' in different namespace", type); | |
673 | cp_pedwarn_at (" from definition of `%#D'", | |
674 | CLASSTYPE_TI_TEMPLATE (type)); | |
675 | } | |
370af2d5 | 676 | SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type); |
36a117a5 MM |
677 | if (processing_template_decl) |
678 | push_template_decl (TYPE_MAIN_DECL (type)); | |
679 | } | |
680 | else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
8251199e | 681 | cp_error ("specialization of `%T' after instantiation", type); |
36a117a5 | 682 | } |
20496fa2 JM |
683 | else if (processing_specialization) |
684 | cp_error ("explicit specialization of non-template `%T'", type); | |
36a117a5 MM |
685 | } |
686 | ||
75650646 MM |
687 | /* Retrieve the specialization (in the sense of [temp.spec] - a |
688 | specialization is either an instantiation or an explicit | |
689 | specialization) of TMPL for the given template ARGS. If there is | |
690 | no such specialization, return NULL_TREE. The ARGS are a vector of | |
691 | arguments, or a vector of vectors of arguments, in the case of | |
692 | templates with more than one level of parameters. */ | |
693 | ||
694 | static tree | |
695 | retrieve_specialization (tmpl, args) | |
696 | tree tmpl; | |
697 | tree args; | |
698 | { | |
699 | tree s; | |
700 | ||
701 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
702 | ||
36a117a5 MM |
703 | /* There should be as many levels of arguments as there are |
704 | levels of parameters. */ | |
705 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
706 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
707 | 0); | |
708 | ||
75650646 MM |
709 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
710 | s != NULL_TREE; | |
711 | s = TREE_CHAIN (s)) | |
712 | if (comp_template_args (TREE_PURPOSE (s), args)) | |
713 | return TREE_VALUE (s); | |
714 | ||
715 | return NULL_TREE; | |
386b8a85 JM |
716 | } |
717 | ||
6dfbb909 | 718 | /* Like retrieve_speciailization, but for local declarations. */ |
9188c363 MM |
719 | |
720 | static tree | |
6dfbb909 | 721 | retrieve_local_specialization (tmpl) |
9188c363 | 722 | tree tmpl; |
9188c363 | 723 | { |
6dfbb909 | 724 | return (tree) htab_find (local_specializations, tmpl); |
9188c363 MM |
725 | } |
726 | ||
6757edfe MM |
727 | /* Returns non-zero iff DECL is a specialization of TMPL. */ |
728 | ||
729 | int | |
730 | is_specialization_of (decl, tmpl) | |
731 | tree decl; | |
732 | tree tmpl; | |
733 | { | |
734 | tree t; | |
735 | ||
736 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
737 | { | |
738 | for (t = decl; | |
739 | t != NULL_TREE; | |
740 | t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE) | |
741 | if (t == tmpl) | |
742 | return 1; | |
743 | } | |
744 | else | |
745 | { | |
746 | my_friendly_assert (TREE_CODE (decl) == TYPE_DECL, 0); | |
747 | ||
748 | for (t = TREE_TYPE (decl); | |
749 | t != NULL_TREE; | |
750 | t = CLASSTYPE_USE_TEMPLATE (t) | |
751 | ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE) | |
3bfdc719 MM |
752 | if (same_type_p (TYPE_MAIN_VARIANT (t), |
753 | TYPE_MAIN_VARIANT (TREE_TYPE (tmpl)))) | |
6757edfe MM |
754 | return 1; |
755 | } | |
386b8a85 | 756 | |
6757edfe MM |
757 | return 0; |
758 | } | |
75650646 MM |
759 | |
760 | /* Register the specialization SPEC as a specialization of TMPL with | |
36a117a5 MM |
761 | the indicated ARGS. Returns SPEC, or an equivalent prior |
762 | declaration, if available. */ | |
75650646 | 763 | |
36a117a5 | 764 | static tree |
75650646 MM |
765 | register_specialization (spec, tmpl, args) |
766 | tree spec; | |
767 | tree tmpl; | |
768 | tree args; | |
769 | { | |
770 | tree s; | |
771 | ||
772 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
773 | ||
36a117a5 MM |
774 | if (TREE_CODE (spec) == FUNCTION_DECL |
775 | && uses_template_parms (DECL_TI_ARGS (spec))) | |
776 | /* This is the FUNCTION_DECL for a partial instantiation. Don't | |
777 | register it; we want the corresponding TEMPLATE_DECL instead. | |
778 | We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than | |
779 | the more obvious `uses_template_parms (spec)' to avoid problems | |
780 | with default function arguments. In particular, given | |
781 | something like this: | |
782 | ||
783 | template <class T> void f(T t1, T t = T()) | |
784 | ||
785 | the default argument expression is not substituted for in an | |
786 | instantiation unless and until it is actually needed. */ | |
787 | return spec; | |
75650646 | 788 | |
36a117a5 MM |
789 | /* There should be as many levels of arguments as there are |
790 | levels of parameters. */ | |
791 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
792 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
793 | 0); | |
794 | ||
75650646 MM |
795 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
796 | s != NULL_TREE; | |
797 | s = TREE_CHAIN (s)) | |
22e9174f MM |
798 | { |
799 | tree fn = TREE_VALUE (s); | |
800 | ||
801 | /* We can sometimes try to re-register a specialization that we've | |
802 | already got. In particular, regenerate_decl_from_template | |
803 | calls duplicate_decls which will update the specialization | |
804 | list. But, we'll still get called again here anyhow. It's | |
805 | more convenient to simply allow this than to try to prevent it. */ | |
806 | if (fn == spec) | |
807 | return spec; | |
808 | else if (comp_template_args (TREE_PURPOSE (s), args)) | |
809 | { | |
810 | if (DECL_TEMPLATE_SPECIALIZATION (spec)) | |
811 | { | |
812 | if (DECL_TEMPLATE_INSTANTIATION (fn)) | |
813 | { | |
814 | if (TREE_USED (fn) | |
815 | || DECL_EXPLICIT_INSTANTIATION (fn)) | |
816 | { | |
817 | cp_error ("specialization of %D after instantiation", | |
818 | fn); | |
819 | return spec; | |
820 | } | |
821 | else | |
822 | { | |
823 | /* This situation should occur only if the first | |
824 | specialization is an implicit instantiation, | |
825 | the second is an explicit specialization, and | |
826 | the implicit instantiation has not yet been | |
827 | used. That situation can occur if we have | |
828 | implicitly instantiated a member function and | |
829 | then specialized it later. | |
830 | ||
831 | We can also wind up here if a friend | |
832 | declaration that looked like an instantiation | |
833 | turns out to be a specialization: | |
834 | ||
835 | template <class T> void foo(T); | |
836 | class S { friend void foo<>(int) }; | |
837 | template <> void foo(int); | |
838 | ||
839 | We transform the existing DECL in place so that | |
840 | any pointers to it become pointers to the | |
841 | updated declaration. | |
842 | ||
843 | If there was a definition for the template, but | |
844 | not for the specialization, we want this to | |
845 | look as if there is no definition, and vice | |
846 | versa. */ | |
847 | DECL_INITIAL (fn) = NULL_TREE; | |
848 | duplicate_decls (spec, fn); | |
849 | ||
850 | return fn; | |
851 | } | |
852 | } | |
853 | else if (DECL_TEMPLATE_SPECIALIZATION (fn)) | |
854 | { | |
855 | duplicate_decls (spec, fn); | |
856 | return fn; | |
857 | } | |
858 | } | |
859 | } | |
75650646 MM |
860 | } |
861 | ||
862 | DECL_TEMPLATE_SPECIALIZATIONS (tmpl) | |
e1b3e07d | 863 | = tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl)); |
36a117a5 MM |
864 | |
865 | return spec; | |
866 | } | |
867 | ||
868 | /* Unregister the specialization SPEC as a specialization of TMPL. | |
869 | Returns nonzero if the SPEC was listed as a specialization of | |
870 | TMPL. */ | |
871 | ||
872 | static int | |
873 | unregister_specialization (spec, tmpl) | |
874 | tree spec; | |
875 | tree tmpl; | |
876 | { | |
877 | tree* s; | |
878 | ||
879 | for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl); | |
880 | *s != NULL_TREE; | |
881 | s = &TREE_CHAIN (*s)) | |
882 | if (TREE_VALUE (*s) == spec) | |
883 | { | |
884 | *s = TREE_CHAIN (*s); | |
885 | return 1; | |
886 | } | |
887 | ||
888 | return 0; | |
75650646 MM |
889 | } |
890 | ||
6dfbb909 MM |
891 | /* Like register_specialization, but for local declarations. We are |
892 | registering SPEC, an instantiation of TMPL. */ | |
9188c363 MM |
893 | |
894 | static tree | |
6dfbb909 | 895 | register_local_specialization (spec, tmpl) |
9188c363 MM |
896 | tree spec; |
897 | tree tmpl; | |
9188c363 | 898 | { |
6dfbb909 MM |
899 | void **slot; |
900 | ||
901 | slot = htab_find_slot (local_specializations, tmpl, INSERT); | |
902 | *slot = spec; | |
9188c363 MM |
903 | |
904 | return spec; | |
905 | } | |
906 | ||
e1467ff2 MM |
907 | /* Print the list of candidate FNS in an error message. */ |
908 | ||
104bf76a | 909 | void |
e1467ff2 MM |
910 | print_candidates (fns) |
911 | tree fns; | |
912 | { | |
913 | tree fn; | |
914 | ||
d8e178a0 | 915 | const char *str = "candidates are:"; |
e1467ff2 MM |
916 | |
917 | for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn)) | |
918 | { | |
d6479fe7 MM |
919 | tree f; |
920 | ||
921 | for (f = TREE_VALUE (fn); f; f = OVL_NEXT (f)) | |
922 | cp_error_at ("%s %+#D", str, OVL_CURRENT (f)); | |
e1467ff2 MM |
923 | str = " "; |
924 | } | |
925 | } | |
926 | ||
75650646 | 927 | /* Returns the template (one of the functions given by TEMPLATE_ID) |
e1467ff2 | 928 | which can be specialized to match the indicated DECL with the |
03017874 MM |
929 | explicit template args given in TEMPLATE_ID. The DECL may be |
930 | NULL_TREE if none is available. In that case, the functions in | |
931 | TEMPLATE_ID are non-members. | |
932 | ||
933 | If NEED_MEMBER_TEMPLATE is non-zero the function is known to be a | |
934 | specialization of a member template. | |
935 | ||
936 | The template args (those explicitly specified and those deduced) | |
937 | are output in a newly created vector *TARGS_OUT. | |
938 | ||
939 | If it is impossible to determine the result, an error message is | |
bf8f3f93 | 940 | issued. The error_mark_node is returned to indicate failure. */ |
75650646 | 941 | |
e9659ab0 | 942 | static tree |
e1467ff2 | 943 | determine_specialization (template_id, decl, targs_out, |
bf8f3f93 | 944 | need_member_template) |
386b8a85 | 945 | tree template_id; |
e1467ff2 | 946 | tree decl; |
386b8a85 JM |
947 | tree* targs_out; |
948 | int need_member_template; | |
386b8a85 | 949 | { |
03017874 MM |
950 | tree fns; |
951 | tree targs; | |
952 | tree explicit_targs; | |
953 | tree candidates = NULL_TREE; | |
954 | tree templates = NULL_TREE; | |
386b8a85 | 955 | |
e1467ff2 MM |
956 | *targs_out = NULL_TREE; |
957 | ||
f2e48b67 BK |
958 | if (template_id == error_mark_node) |
959 | return error_mark_node; | |
960 | ||
961 | fns = TREE_OPERAND (template_id, 0); | |
03017874 | 962 | explicit_targs = TREE_OPERAND (template_id, 1); |
f2e48b67 | 963 | |
27fafc8d JM |
964 | if (fns == error_mark_node) |
965 | return error_mark_node; | |
966 | ||
2c73f9f5 | 967 | /* Check for baselinks. */ |
91e490ab | 968 | if (BASELINK_P (fns)) |
2c73f9f5 | 969 | fns = TREE_VALUE (fns); |
386b8a85 | 970 | |
91e490ab MM |
971 | if (!is_overloaded_fn (fns)) |
972 | { | |
9dfce8fd | 973 | cp_error ("`%D' is not a function template", fns); |
91e490ab MM |
974 | return error_mark_node; |
975 | } | |
976 | ||
2c73f9f5 | 977 | for (; fns; fns = OVL_NEXT (fns)) |
386b8a85 | 978 | { |
75650646 MM |
979 | tree tmpl; |
980 | ||
9dfce8fd | 981 | tree fn = OVL_CURRENT (fns); |
03017874 MM |
982 | |
983 | if (TREE_CODE (fn) == TEMPLATE_DECL) | |
984 | /* DECL might be a specialization of FN. */ | |
985 | tmpl = fn; | |
986 | else if (need_member_template) | |
987 | /* FN is an ordinary member function, and we need a | |
988 | specialization of a member template. */ | |
989 | continue; | |
990 | else if (TREE_CODE (fn) != FUNCTION_DECL) | |
991 | /* We can get IDENTIFIER_NODEs here in certain erroneous | |
992 | cases. */ | |
993 | continue; | |
994 | else if (!DECL_FUNCTION_MEMBER_P (fn)) | |
995 | /* This is just an ordinary non-member function. Nothing can | |
996 | be a specialization of that. */ | |
997 | continue; | |
75650646 | 998 | else |
03017874 MM |
999 | { |
1000 | tree decl_arg_types; | |
386b8a85 | 1001 | |
03017874 MM |
1002 | /* This is an ordinary member function. However, since |
1003 | we're here, we can assume it's enclosing class is a | |
1004 | template class. For example, | |
1005 | ||
1006 | template <typename T> struct S { void f(); }; | |
1007 | template <> void S<int>::f() {} | |
1008 | ||
1009 | Here, S<int>::f is a non-template, but S<int> is a | |
1010 | template class. If FN has the same type as DECL, we | |
1011 | might be in business. */ | |
1012 | if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)), | |
1013 | TREE_TYPE (TREE_TYPE (fn)))) | |
1014 | /* The return types differ. */ | |
1015 | continue; | |
1016 | ||
1017 | /* Adjust the type of DECL in case FN is a static member. */ | |
1018 | decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1019 | if (DECL_STATIC_FUNCTION_P (fn) | |
1020 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
1021 | decl_arg_types = TREE_CHAIN (decl_arg_types); | |
1022 | ||
1023 | if (compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
1024 | decl_arg_types)) | |
1025 | /* They match! */ | |
1026 | candidates = tree_cons (NULL_TREE, fn, candidates); | |
1027 | ||
1028 | continue; | |
1029 | } | |
386b8a85 | 1030 | |
bf8f3f93 MM |
1031 | /* See whether this function might be a specialization of this |
1032 | template. */ | |
1033 | targs = get_bindings (tmpl, decl, explicit_targs); | |
03017874 MM |
1034 | |
1035 | if (!targs) | |
bf8f3f93 | 1036 | /* We cannot deduce template arguments that when used to |
03017874 MM |
1037 | specialize TMPL will produce DECL. */ |
1038 | continue; | |
1039 | ||
1040 | /* Save this template, and the arguments deduced. */ | |
e1b3e07d | 1041 | templates = tree_cons (targs, tmpl, templates); |
386b8a85 | 1042 | } |
03017874 | 1043 | |
bf8f3f93 | 1044 | if (templates && TREE_CHAIN (templates)) |
386b8a85 | 1045 | { |
03017874 MM |
1046 | /* We have: |
1047 | ||
1048 | [temp.expl.spec] | |
1049 | ||
1050 | It is possible for a specialization with a given function | |
1051 | signature to be instantiated from more than one function | |
1052 | template. In such cases, explicit specification of the | |
1053 | template arguments must be used to uniquely identify the | |
1054 | function template specialization being specialized. | |
1055 | ||
1056 | Note that here, there's no suggestion that we're supposed to | |
1057 | determine which of the candidate templates is most | |
1058 | specialized. However, we, also have: | |
1059 | ||
1060 | [temp.func.order] | |
1061 | ||
1062 | Partial ordering of overloaded function template | |
1063 | declarations is used in the following contexts to select | |
1064 | the function template to which a function template | |
1065 | specialization refers: | |
1066 | ||
1067 | -- when an explicit specialization refers to a function | |
1068 | template. | |
1069 | ||
1070 | So, we do use the partial ordering rules, at least for now. | |
1071 | This extension can only serve to make illegal programs legal, | |
1072 | so it's safe. And, there is strong anecdotal evidence that | |
1073 | the committee intended the partial ordering rules to apply; | |
1074 | the EDG front-end has that behavior, and John Spicer claims | |
1075 | that the committee simply forgot to delete the wording in | |
1076 | [temp.expl.spec]. */ | |
1077 | tree tmpl = most_specialized (templates, decl, explicit_targs); | |
1078 | if (tmpl && tmpl != error_mark_node) | |
1079 | { | |
1080 | targs = get_bindings (tmpl, decl, explicit_targs); | |
e1b3e07d | 1081 | templates = tree_cons (targs, tmpl, NULL_TREE); |
03017874 | 1082 | } |
e1467ff2 MM |
1083 | } |
1084 | ||
03017874 | 1085 | if (templates == NULL_TREE && candidates == NULL_TREE) |
e1467ff2 | 1086 | { |
bf8f3f93 MM |
1087 | cp_error_at ("template-id `%D' for `%+D' does not match any template declaration", |
1088 | template_id, decl); | |
03017874 | 1089 | return error_mark_node; |
386b8a85 | 1090 | } |
03017874 | 1091 | else if ((templates && TREE_CHAIN (templates)) |
bf8f3f93 MM |
1092 | || (candidates && TREE_CHAIN (candidates)) |
1093 | || (templates && candidates)) | |
386b8a85 | 1094 | { |
bf8f3f93 MM |
1095 | cp_error_at ("ambiguous template specialization `%D' for `%+D'", |
1096 | template_id, decl); | |
1097 | chainon (candidates, templates); | |
1098 | print_candidates (candidates); | |
03017874 | 1099 | return error_mark_node; |
386b8a85 JM |
1100 | } |
1101 | ||
1102 | /* We have one, and exactly one, match. */ | |
03017874 MM |
1103 | if (candidates) |
1104 | { | |
1105 | /* It was a specialization of an ordinary member function in a | |
1106 | template class. */ | |
1107 | *targs_out = copy_node (DECL_TI_ARGS (TREE_VALUE (candidates))); | |
1108 | return DECL_TI_TEMPLATE (TREE_VALUE (candidates)); | |
1109 | } | |
1110 | ||
1111 | /* It was a specialization of a template. */ | |
17aec3eb | 1112 | targs = DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates))); |
03017874 MM |
1113 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs)) |
1114 | { | |
1115 | *targs_out = copy_node (targs); | |
1116 | SET_TMPL_ARGS_LEVEL (*targs_out, | |
1117 | TMPL_ARGS_DEPTH (*targs_out), | |
1118 | TREE_PURPOSE (templates)); | |
1119 | } | |
1120 | else | |
1121 | *targs_out = TREE_PURPOSE (templates); | |
e1467ff2 | 1122 | return TREE_VALUE (templates); |
8d08fdba | 1123 | } |
6757edfe | 1124 | |
386b8a85 | 1125 | /* Check to see if the function just declared, as indicated in |
75650646 MM |
1126 | DECLARATOR, and in DECL, is a specialization of a function |
1127 | template. We may also discover that the declaration is an explicit | |
1128 | instantiation at this point. | |
1129 | ||
e1467ff2 | 1130 | Returns DECL, or an equivalent declaration that should be used |
03017874 MM |
1131 | instead if all goes well. Issues an error message if something is |
1132 | amiss. Returns error_mark_node if the error is not easily | |
1133 | recoverable. | |
75650646 | 1134 | |
75650646 MM |
1135 | FLAGS is a bitmask consisting of the following flags: |
1136 | ||
75650646 MM |
1137 | 2: The function has a definition. |
1138 | 4: The function is a friend. | |
75650646 MM |
1139 | |
1140 | The TEMPLATE_COUNT is the number of references to qualifying | |
1141 | template classes that appeared in the name of the function. For | |
1142 | example, in | |
1143 | ||
1144 | template <class T> struct S { void f(); }; | |
1145 | void S<int>::f(); | |
1146 | ||
1147 | the TEMPLATE_COUNT would be 1. However, explicitly specialized | |
1148 | classes are not counted in the TEMPLATE_COUNT, so that in | |
1149 | ||
1150 | template <class T> struct S {}; | |
1151 | template <> struct S<int> { void f(); } | |
36a117a5 | 1152 | template <> void S<int>::f(); |
75650646 MM |
1153 | |
1154 | the TEMPLATE_COUNT would be 0. (Note that this declaration is | |
1155 | illegal; there should be no template <>.) | |
1156 | ||
1157 | If the function is a specialization, it is marked as such via | |
1158 | DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO | |
1159 | is set up correctly, and it is added to the list of specializations | |
1160 | for that template. */ | |
386b8a85 | 1161 | |
e1467ff2 | 1162 | tree |
27bb8339 | 1163 | check_explicit_specialization (declarator, decl, template_count, flags) |
386b8a85 JM |
1164 | tree declarator; |
1165 | tree decl; | |
1166 | int template_count; | |
1167 | int flags; | |
1168 | { | |
75650646 MM |
1169 | int have_def = flags & 2; |
1170 | int is_friend = flags & 4; | |
1171 | int specialization = 0; | |
e1467ff2 | 1172 | int explicit_instantiation = 0; |
fd4de5ff | 1173 | int member_specialization = 0; |
75650646 MM |
1174 | tree ctype = DECL_CLASS_CONTEXT (decl); |
1175 | tree dname = DECL_NAME (decl); | |
74b846e0 | 1176 | tmpl_spec_kind tsk; |
386b8a85 | 1177 | |
74b846e0 | 1178 | tsk = current_tmpl_spec_kind (template_count); |
75650646 | 1179 | |
74b846e0 MM |
1180 | switch (tsk) |
1181 | { | |
1182 | case tsk_none: | |
1183 | if (processing_specialization) | |
75650646 | 1184 | { |
fd4de5ff MM |
1185 | specialization = 1; |
1186 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
75650646 | 1187 | } |
74b846e0 | 1188 | else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) |
386b8a85 | 1189 | { |
74b846e0 MM |
1190 | if (is_friend) |
1191 | /* This could be something like: | |
75650646 | 1192 | |
74b846e0 MM |
1193 | template <class T> void f(T); |
1194 | class S { friend void f<>(int); } */ | |
1195 | specialization = 1; | |
1196 | else | |
1197 | { | |
1198 | /* This case handles bogus declarations like template <> | |
1199 | template <class T> void f<int>(); */ | |
1200 | ||
1201 | cp_error ("template-id `%D' in declaration of primary template", | |
1202 | declarator); | |
1203 | return decl; | |
1204 | } | |
1205 | } | |
1206 | break; | |
1207 | ||
1208 | case tsk_invalid_member_spec: | |
1209 | /* The error has already been reported in | |
1210 | check_specialization_scope. */ | |
1211 | return error_mark_node; | |
1212 | ||
1213 | case tsk_invalid_expl_inst: | |
1214 | cp_error ("template parameter list used in explicit instantiation"); | |
1215 | ||
1216 | /* Fall through. */ | |
1217 | ||
1218 | case tsk_expl_inst: | |
fd4de5ff MM |
1219 | if (have_def) |
1220 | cp_error ("definition provided for explicit instantiation"); | |
74b846e0 | 1221 | |
fd4de5ff | 1222 | explicit_instantiation = 1; |
74b846e0 | 1223 | break; |
fd4de5ff | 1224 | |
74b846e0 MM |
1225 | case tsk_excessive_parms: |
1226 | cp_error ("too many template parameter lists in declaration of `%D'", | |
1227 | decl); | |
1228 | return error_mark_node; | |
75650646 | 1229 | |
74b846e0 MM |
1230 | /* Fall through. */ |
1231 | case tsk_expl_spec: | |
1232 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1233 | if (ctype) | |
1234 | member_specialization = 1; | |
1235 | else | |
1236 | specialization = 1; | |
1237 | break; | |
1238 | ||
1239 | case tsk_insufficient_parms: | |
fd4de5ff MM |
1240 | if (template_header_count) |
1241 | { | |
74b846e0 MM |
1242 | cp_error("too few template parameter lists in declaration of `%D'", |
1243 | decl); | |
fd4de5ff | 1244 | return decl; |
c6f2ed0d | 1245 | } |
74b846e0 MM |
1246 | else if (ctype != NULL_TREE |
1247 | && !TYPE_BEING_DEFINED (ctype) | |
1248 | && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype) | |
1249 | && !is_friend) | |
1250 | { | |
1251 | /* For backwards compatibility, we accept: | |
fd4de5ff | 1252 | |
74b846e0 MM |
1253 | template <class T> struct S { void f(); }; |
1254 | void S<int>::f() {} // Missing template <> | |
fd4de5ff | 1255 | |
74b846e0 MM |
1256 | That used to be legal C++. */ |
1257 | if (pedantic) | |
1258 | cp_pedwarn | |
1259 | ("explicit specialization not preceded by `template <>'"); | |
1260 | specialization = 1; | |
1261 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1262 | } | |
1263 | break; | |
1264 | ||
1265 | case tsk_template: | |
1266 | if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
c6f2ed0d | 1267 | { |
fd4de5ff MM |
1268 | /* This case handles bogus declarations like template <> |
1269 | template <class T> void f<int>(); */ | |
75650646 | 1270 | |
fd4de5ff MM |
1271 | cp_error ("template-id `%D' in declaration of primary template", |
1272 | declarator); | |
1273 | return decl; | |
386b8a85 | 1274 | } |
74b846e0 MM |
1275 | |
1276 | if (ctype && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype)) | |
1277 | /* This is a specialization of a member template, without | |
1278 | specialization the containing class. Something like: | |
1279 | ||
1280 | template <class T> struct S { | |
1281 | template <class U> void f (U); | |
1282 | }; | |
1283 | template <> template <class U> void S<int>::f(U) {} | |
1284 | ||
1285 | That's a specialization -- but of the entire template. */ | |
1286 | specialization = 1; | |
1287 | break; | |
1288 | ||
1289 | default: | |
1290 | my_friendly_abort (20000309); | |
75650646 | 1291 | } |
386b8a85 | 1292 | |
670960ac JM |
1293 | if (specialization || member_specialization) |
1294 | { | |
1295 | tree t = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1296 | for (; t; t = TREE_CHAIN (t)) | |
1297 | if (TREE_PURPOSE (t)) | |
1298 | { | |
8251199e JM |
1299 | cp_pedwarn |
1300 | ("default argument specified in explicit specialization"); | |
670960ac JM |
1301 | break; |
1302 | } | |
f3400fe2 JM |
1303 | if (current_lang_name == lang_name_c) |
1304 | cp_error ("template specialization with C linkage"); | |
670960ac JM |
1305 | } |
1306 | ||
e1467ff2 | 1307 | if (specialization || member_specialization || explicit_instantiation) |
75650646 MM |
1308 | { |
1309 | tree tmpl = NULL_TREE; | |
1310 | tree targs = NULL_TREE; | |
75650646 MM |
1311 | |
1312 | /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */ | |
386b8a85 JM |
1313 | if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR) |
1314 | { | |
1315 | tree fns; | |
1316 | ||
1317 | my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, | |
1318 | 0); | |
1319 | if (!ctype) | |
30394414 | 1320 | fns = IDENTIFIER_NAMESPACE_VALUE (dname); |
386b8a85 JM |
1321 | else |
1322 | fns = dname; | |
1323 | ||
75650646 MM |
1324 | declarator = |
1325 | lookup_template_function (fns, NULL_TREE); | |
386b8a85 JM |
1326 | } |
1327 | ||
f2e48b67 BK |
1328 | if (declarator == error_mark_node) |
1329 | return error_mark_node; | |
1330 | ||
75650646 MM |
1331 | if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype)) |
1332 | { | |
8ec2ac34 | 1333 | if (!explicit_instantiation) |
6c30752f MM |
1334 | /* A specialization in class scope. This is illegal, |
1335 | but the error will already have been flagged by | |
1336 | check_specialization_scope. */ | |
1337 | return error_mark_node; | |
8ec2ac34 | 1338 | else |
b370501f KG |
1339 | { |
1340 | /* It's not legal to write an explicit instantiation in | |
1341 | class scope, e.g.: | |
8ec2ac34 | 1342 | |
b370501f | 1343 | class C { template void f(); } |
8ec2ac34 | 1344 | |
b370501f KG |
1345 | This case is caught by the parser. However, on |
1346 | something like: | |
8ec2ac34 | 1347 | |
b370501f | 1348 | template class C { void f(); }; |
8ec2ac34 | 1349 | |
b370501f KG |
1350 | (which is illegal) we can get here. The error will be |
1351 | issued later. */ | |
1352 | ; | |
1353 | } | |
8ec2ac34 | 1354 | |
e1467ff2 | 1355 | return decl; |
75650646 | 1356 | } |
8f032717 MM |
1357 | else if (TREE_CODE (TREE_OPERAND (declarator, 0)) == LOOKUP_EXPR) |
1358 | { | |
1359 | /* A friend declaration. We can't do much, because we don't | |
1360 | know what this resolves to, yet. */ | |
1361 | my_friendly_assert (is_friend != 0, 0); | |
1362 | my_friendly_assert (!explicit_instantiation, 0); | |
1363 | SET_DECL_IMPLICIT_INSTANTIATION (decl); | |
1364 | return decl; | |
1365 | } | |
75650646 MM |
1366 | else if (ctype != NULL_TREE |
1367 | && (TREE_CODE (TREE_OPERAND (declarator, 0)) == | |
1368 | IDENTIFIER_NODE)) | |
386b8a85 | 1369 | { |
75650646 MM |
1370 | /* Find the list of functions in ctype that have the same |
1371 | name as the declared function. */ | |
1372 | tree name = TREE_OPERAND (declarator, 0); | |
03017874 MM |
1373 | tree fns = NULL_TREE; |
1374 | int idx; | |
1375 | ||
75650646 MM |
1376 | if (name == constructor_name (ctype) |
1377 | || name == constructor_name_full (ctype)) | |
386b8a85 | 1378 | { |
75650646 MM |
1379 | int is_constructor = DECL_CONSTRUCTOR_P (decl); |
1380 | ||
1381 | if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype) | |
1382 | : !TYPE_HAS_DESTRUCTOR (ctype)) | |
1383 | { | |
1384 | /* From [temp.expl.spec]: | |
e1467ff2 | 1385 | |
75650646 MM |
1386 | If such an explicit specialization for the member |
1387 | of a class template names an implicitly-declared | |
1388 | special member function (clause _special_), the | |
e1467ff2 MM |
1389 | program is ill-formed. |
1390 | ||
1391 | Similar language is found in [temp.explicit]. */ | |
8251199e | 1392 | cp_error ("specialization of implicitly-declared special member function"); |
03017874 | 1393 | return error_mark_node; |
75650646 | 1394 | } |
386b8a85 | 1395 | |
42da2fd8 | 1396 | name = is_constructor ? ctor_identifier : dtor_identifier; |
75650646 | 1397 | } |
42da2fd8 | 1398 | |
03017874 MM |
1399 | if (!IDENTIFIER_TYPENAME_P (name)) |
1400 | { | |
1401 | idx = lookup_fnfields_1 (ctype, name); | |
1402 | if (idx >= 0) | |
1403 | fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (ctype), idx); | |
1404 | } | |
1405 | else | |
1406 | { | |
1407 | tree methods; | |
1408 | ||
1409 | /* For a type-conversion operator, we cannot do a | |
1410 | name-based lookup. We might be looking for `operator | |
1411 | int' which will be a specialization of `operator T'. | |
1412 | So, we find *all* the conversion operators, and then | |
1413 | select from them. */ | |
1414 | fns = NULL_TREE; | |
1415 | ||
1416 | methods = CLASSTYPE_METHOD_VEC (ctype); | |
1417 | if (methods) | |
1418 | for (idx = 2; idx < TREE_VEC_LENGTH (methods); ++idx) | |
1419 | { | |
1420 | tree ovl = TREE_VEC_ELT (methods, idx); | |
1421 | ||
1422 | if (!ovl || !DECL_CONV_FN_P (OVL_CURRENT (ovl))) | |
1423 | /* There are no more conversion functions. */ | |
1424 | break; | |
1425 | ||
1426 | /* Glue all these conversion functions together | |
1427 | with those we already have. */ | |
1428 | for (; ovl; ovl = OVL_NEXT (ovl)) | |
1429 | fns = ovl_cons (OVL_CURRENT (ovl), fns); | |
1430 | } | |
1431 | } | |
1432 | ||
386b8a85 JM |
1433 | if (fns == NULL_TREE) |
1434 | { | |
b3f738da MM |
1435 | cp_error ("no member function `%D' declared in `%T'", |
1436 | name, ctype); | |
03017874 | 1437 | return error_mark_node; |
386b8a85 JM |
1438 | } |
1439 | else | |
1440 | TREE_OPERAND (declarator, 0) = fns; | |
1441 | } | |
75650646 | 1442 | |
e1467ff2 MM |
1443 | /* Figure out what exactly is being specialized at this point. |
1444 | Note that for an explicit instantiation, even one for a | |
38e01259 | 1445 | member function, we cannot tell apriori whether the |
e1467ff2 | 1446 | instantiation is for a member template, or just a member |
36a117a5 MM |
1447 | function of a template class. Even if a member template is |
1448 | being instantiated, the member template arguments may be | |
1449 | elided if they can be deduced from the rest of the | |
1450 | declaration. */ | |
e1467ff2 MM |
1451 | tmpl = determine_specialization (declarator, decl, |
1452 | &targs, | |
bf8f3f93 | 1453 | member_specialization); |
386b8a85 | 1454 | |
03017874 MM |
1455 | if (!tmpl || tmpl == error_mark_node) |
1456 | /* We couldn't figure out what this declaration was | |
1457 | specializing. */ | |
1458 | return error_mark_node; | |
1459 | else | |
386b8a85 | 1460 | { |
25aab5d0 | 1461 | tree gen_tmpl = most_general_template (tmpl); |
36a117a5 | 1462 | |
e1467ff2 MM |
1463 | if (explicit_instantiation) |
1464 | { | |
03d0f4af | 1465 | /* We don't set DECL_EXPLICIT_INSTANTIATION here; that |
25aab5d0 MM |
1466 | is done by do_decl_instantiation later. */ |
1467 | ||
1468 | int arg_depth = TMPL_ARGS_DEPTH (targs); | |
1469 | int parm_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)); | |
1470 | ||
1471 | if (arg_depth > parm_depth) | |
1472 | { | |
1473 | /* If TMPL is not the most general template (for | |
1474 | example, if TMPL is a friend template that is | |
1475 | injected into namespace scope), then there will | |
1476 | be too many levels fo TARGS. Remove some of them | |
1477 | here. */ | |
1478 | int i; | |
1479 | tree new_targs; | |
1480 | ||
f31c0a32 | 1481 | new_targs = make_tree_vec (parm_depth); |
25aab5d0 MM |
1482 | for (i = arg_depth - parm_depth; i < arg_depth; ++i) |
1483 | TREE_VEC_ELT (new_targs, i - (arg_depth - parm_depth)) | |
1484 | = TREE_VEC_ELT (targs, i); | |
1485 | targs = new_targs; | |
1486 | } | |
1487 | ||
74b846e0 | 1488 | return instantiate_template (tmpl, targs); |
e1467ff2 | 1489 | } |
74b846e0 MM |
1490 | |
1491 | /* If this is both a template specialization, then it's a | |
1492 | specialization of a member template of a template class. | |
1493 | In that case we want to return the TEMPLATE_DECL, not the | |
1494 | specialization of it. */ | |
1495 | if (tsk == tsk_template) | |
1496 | { | |
1497 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
1498 | return tmpl; | |
1499 | } | |
1500 | ||
36a117a5 MM |
1501 | /* If we though that the DECL was a member function, but it |
1502 | turns out to be specializing a static member function, | |
1503 | make DECL a static member function as well. */ | |
1504 | if (DECL_STATIC_FUNCTION_P (tmpl) | |
1505 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
366c0f1e | 1506 | { |
3afb32a4 | 1507 | revert_static_member_fn (decl); |
366c0f1e MM |
1508 | last_function_parms = TREE_CHAIN (last_function_parms); |
1509 | } | |
e1467ff2 | 1510 | |
36a117a5 | 1511 | /* Set up the DECL_TEMPLATE_INFO for DECL. */ |
e1b3e07d | 1512 | DECL_TEMPLATE_INFO (decl) = tree_cons (tmpl, targs, NULL_TREE); |
36a117a5 | 1513 | |
e1467ff2 MM |
1514 | /* Mangle the function name appropriately. Note that we do |
1515 | not mangle specializations of non-template member | |
1516 | functions of template classes, e.g. with | |
36a117a5 | 1517 | |
e1467ff2 | 1518 | template <class T> struct S { void f(); } |
36a117a5 | 1519 | |
e1467ff2 | 1520 | and given the specialization |
36a117a5 | 1521 | |
e1467ff2 | 1522 | template <> void S<int>::f() {} |
36a117a5 | 1523 | |
e1467ff2 MM |
1524 | we do not mangle S<int>::f() here. That's because it's |
1525 | just an ordinary member function and doesn't need special | |
36a117a5 | 1526 | treatment. We do this here so that the ordinary, |
74b846e0 | 1527 | non-template, name-mangling algorithm will not be used |
36a117a5 | 1528 | later. */ |
e1467ff2 | 1529 | if ((is_member_template (tmpl) || ctype == NULL_TREE) |
75650646 | 1530 | && name_mangling_version >= 1) |
36a117a5 | 1531 | set_mangled_name_for_template_decl (decl); |
386b8a85 JM |
1532 | |
1533 | if (is_friend && !have_def) | |
36a117a5 MM |
1534 | /* This is not really a declaration of a specialization. |
1535 | It's just the name of an instantiation. But, it's not | |
1536 | a request for an instantiation, either. */ | |
fbf1c34b | 1537 | SET_DECL_IMPLICIT_INSTANTIATION (decl); |
75650646 | 1538 | |
36a117a5 MM |
1539 | /* Register this specialization so that we can find it |
1540 | again. */ | |
1541 | decl = register_specialization (decl, gen_tmpl, targs); | |
386b8a85 JM |
1542 | } |
1543 | } | |
75650646 | 1544 | |
e1467ff2 | 1545 | return decl; |
386b8a85 | 1546 | } |
75650646 | 1547 | |
39c01e4c MM |
1548 | /* TYPE is being declared. Verify that the use of template headers |
1549 | and such is reasonable. Issue error messages if not. */ | |
1550 | ||
1551 | void | |
1552 | maybe_check_template_type (type) | |
1553 | tree type; | |
1554 | { | |
1555 | if (template_header_count) | |
1556 | { | |
1557 | /* We are in the scope of some `template <...>' header. */ | |
1558 | ||
1559 | int context_depth | |
1560 | = template_class_depth_real (TYPE_CONTEXT (type), | |
1561 | /*count_specializations=*/1); | |
1562 | ||
1563 | if (template_header_count <= context_depth) | |
1564 | /* This is OK; the template headers are for the context. We | |
1565 | are actually too lenient here; like | |
1566 | check_explicit_specialization we should consider the number | |
1567 | of template types included in the actual declaration. For | |
1568 | example, | |
1569 | ||
1570 | template <class T> struct S { | |
1571 | template <class U> template <class V> | |
1572 | struct I {}; | |
1573 | }; | |
1574 | ||
1575 | is illegal, but: | |
1576 | ||
1577 | template <class T> struct S { | |
1578 | template <class U> struct I; | |
1579 | }; | |
1580 | ||
1581 | template <class T> template <class U. | |
1582 | struct S<T>::I {}; | |
1583 | ||
1584 | is not. */ | |
1585 | ; | |
1586 | else if (template_header_count > context_depth + 1) | |
1587 | /* There are two many template parameter lists. */ | |
8251199e | 1588 | cp_error ("too many template parameter lists in declaration of `%T'", type); |
39c01e4c MM |
1589 | } |
1590 | } | |
1591 | ||
75650646 MM |
1592 | /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template |
1593 | parameters. These are represented in the same format used for | |
1594 | DECL_TEMPLATE_PARMS. */ | |
1595 | ||
1596 | int comp_template_parms (parms1, parms2) | |
1597 | tree parms1; | |
1598 | tree parms2; | |
1599 | { | |
1600 | tree p1; | |
1601 | tree p2; | |
1602 | ||
1603 | if (parms1 == parms2) | |
1604 | return 1; | |
1605 | ||
1606 | for (p1 = parms1, p2 = parms2; | |
1607 | p1 != NULL_TREE && p2 != NULL_TREE; | |
1608 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2)) | |
1609 | { | |
1610 | tree t1 = TREE_VALUE (p1); | |
1611 | tree t2 = TREE_VALUE (p2); | |
1612 | int i; | |
1613 | ||
1614 | my_friendly_assert (TREE_CODE (t1) == TREE_VEC, 0); | |
1615 | my_friendly_assert (TREE_CODE (t2) == TREE_VEC, 0); | |
1616 | ||
1617 | if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2)) | |
1618 | return 0; | |
1619 | ||
1620 | for (i = 0; i < TREE_VEC_LENGTH (t2); ++i) | |
1621 | { | |
1622 | tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i)); | |
1623 | tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i)); | |
1624 | ||
1625 | if (TREE_CODE (parm1) != TREE_CODE (parm2)) | |
1626 | return 0; | |
1627 | ||
1628 | if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM) | |
1629 | continue; | |
3bfdc719 | 1630 | else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2))) |
75650646 MM |
1631 | return 0; |
1632 | } | |
1633 | } | |
1634 | ||
1635 | if ((p1 != NULL_TREE) != (p2 != NULL_TREE)) | |
1636 | /* One set of parameters has more parameters lists than the | |
1637 | other. */ | |
1638 | return 0; | |
1639 | ||
1640 | return 1; | |
1641 | } | |
1642 | ||
f3400fe2 JM |
1643 | /* Complain if DECL shadows a template parameter. |
1644 | ||
1645 | [temp.local]: A template-parameter shall not be redeclared within its | |
1646 | scope (including nested scopes). */ | |
1647 | ||
1648 | void | |
1649 | check_template_shadow (decl) | |
1650 | tree decl; | |
1651 | { | |
8f032717 MM |
1652 | tree olddecl; |
1653 | ||
b5d9b9ab MM |
1654 | /* If we're not in a template, we can't possibly shadow a template |
1655 | parameter. */ | |
1656 | if (!current_template_parms) | |
1657 | return; | |
1658 | ||
1659 | /* Figure out what we're shadowing. */ | |
8f032717 MM |
1660 | if (TREE_CODE (decl) == OVERLOAD) |
1661 | decl = OVL_CURRENT (decl); | |
1662 | olddecl = IDENTIFIER_VALUE (DECL_NAME (decl)); | |
f3400fe2 | 1663 | |
b5d9b9ab MM |
1664 | /* If there's no previous binding for this name, we're not shadowing |
1665 | anything, let alone a template parameter. */ | |
1666 | if (!olddecl) | |
1667 | return; | |
1668 | ||
1669 | /* If we're not shadowing a template parameter, we're done. Note | |
1670 | that OLDDECL might be an OVERLOAD (or perhaps even an | |
1671 | ERROR_MARK), so we can't just blithely assume it to be a _DECL | |
1672 | node. */ | |
2f939d94 | 1673 | if (!DECL_P (olddecl) || !DECL_TEMPLATE_PARM_P (olddecl)) |
b5d9b9ab MM |
1674 | return; |
1675 | ||
1676 | /* We check for decl != olddecl to avoid bogus errors for using a | |
1677 | name inside a class. We check TPFI to avoid duplicate errors for | |
1678 | inline member templates. */ | |
1679 | if (decl == olddecl | |
1680 | || TEMPLATE_PARMS_FOR_INLINE (current_template_parms)) | |
1681 | return; | |
1682 | ||
1683 | cp_error_at ("declaration of `%#D'", decl); | |
1684 | cp_error_at (" shadows template parm `%#D'", olddecl); | |
f3400fe2 | 1685 | } |
22a7be53 | 1686 | |
f3400fe2 | 1687 | /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL, |
f84b4be9 JM |
1688 | ORIG_LEVEL, DECL, and TYPE. */ |
1689 | ||
1690 | static tree | |
1691 | build_template_parm_index (index, level, orig_level, decl, type) | |
1692 | int index; | |
1693 | int level; | |
1694 | int orig_level; | |
1695 | tree decl; | |
1696 | tree type; | |
1697 | { | |
1698 | tree t = make_node (TEMPLATE_PARM_INDEX); | |
1699 | TEMPLATE_PARM_IDX (t) = index; | |
1700 | TEMPLATE_PARM_LEVEL (t) = level; | |
1701 | TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level; | |
1702 | TEMPLATE_PARM_DECL (t) = decl; | |
1703 | TREE_TYPE (t) = type; | |
1704 | ||
1705 | return t; | |
1706 | } | |
1707 | ||
f84b4be9 | 1708 | /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose |
93cdc044 | 1709 | TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a |
f84b4be9 JM |
1710 | TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a |
1711 | new one is created. */ | |
1712 | ||
1713 | static tree | |
93cdc044 | 1714 | reduce_template_parm_level (index, type, levels) |
f84b4be9 JM |
1715 | tree index; |
1716 | tree type; | |
93cdc044 | 1717 | int levels; |
f84b4be9 JM |
1718 | { |
1719 | if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE | |
1720 | || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index)) | |
93cdc044 | 1721 | != TEMPLATE_PARM_LEVEL (index) - levels)) |
f84b4be9 JM |
1722 | { |
1723 | tree decl | |
1724 | = build_decl (TREE_CODE (TEMPLATE_PARM_DECL (index)), | |
1725 | DECL_NAME (TEMPLATE_PARM_DECL (index)), | |
1726 | type); | |
1727 | tree t | |
1728 | = build_template_parm_index (TEMPLATE_PARM_IDX (index), | |
93cdc044 | 1729 | TEMPLATE_PARM_LEVEL (index) - levels, |
f84b4be9 JM |
1730 | TEMPLATE_PARM_ORIG_LEVEL (index), |
1731 | decl, type); | |
1732 | TEMPLATE_PARM_DESCENDANTS (index) = t; | |
cae40af6 JM |
1733 | |
1734 | /* Template template parameters need this. */ | |
1735 | DECL_TEMPLATE_PARMS (decl) | |
1736 | = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index)); | |
f84b4be9 JM |
1737 | } |
1738 | ||
1739 | return TEMPLATE_PARM_DESCENDANTS (index); | |
1740 | } | |
1741 | ||
8d08fdba | 1742 | /* Process information from new template parameter NEXT and append it to the |
5566b478 | 1743 | LIST being built. */ |
e92cc029 | 1744 | |
8d08fdba MS |
1745 | tree |
1746 | process_template_parm (list, next) | |
1747 | tree list, next; | |
1748 | { | |
1749 | tree parm; | |
1750 | tree decl = 0; | |
a292b002 | 1751 | tree defval; |
5566b478 | 1752 | int is_type, idx; |
f84b4be9 | 1753 | |
8d08fdba MS |
1754 | parm = next; |
1755 | my_friendly_assert (TREE_CODE (parm) == TREE_LIST, 259); | |
a292b002 MS |
1756 | defval = TREE_PURPOSE (parm); |
1757 | parm = TREE_VALUE (parm); | |
1758 | is_type = TREE_PURPOSE (parm) == class_type_node; | |
5566b478 MS |
1759 | |
1760 | if (list) | |
1761 | { | |
1762 | tree p = TREE_VALUE (tree_last (list)); | |
1763 | ||
1764 | if (TREE_CODE (p) == TYPE_DECL) | |
1765 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p)); | |
73b0fce8 KL |
1766 | else if (TREE_CODE (p) == TEMPLATE_DECL) |
1767 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (DECL_TEMPLATE_RESULT (p))); | |
5566b478 | 1768 | else |
f84b4be9 | 1769 | idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p)); |
5566b478 MS |
1770 | ++idx; |
1771 | } | |
1772 | else | |
1773 | idx = 0; | |
1774 | ||
8d08fdba MS |
1775 | if (!is_type) |
1776 | { | |
a292b002 | 1777 | my_friendly_assert (TREE_CODE (TREE_PURPOSE (parm)) == TREE_LIST, 260); |
8d08fdba | 1778 | /* is a const-param */ |
a292b002 | 1779 | parm = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), |
c11b6f21 | 1780 | PARM, 0, NULL_TREE); |
d490621d MM |
1781 | |
1782 | /* [temp.param] | |
1783 | ||
1784 | The top-level cv-qualifiers on the template-parameter are | |
1785 | ignored when determining its type. */ | |
1786 | TREE_TYPE (parm) = TYPE_MAIN_VARIANT (TREE_TYPE (parm)); | |
1787 | ||
8d08fdba MS |
1788 | /* A template parameter is not modifiable. */ |
1789 | TREE_READONLY (parm) = 1; | |
c91a56d2 | 1790 | if (IS_AGGR_TYPE (TREE_TYPE (parm)) |
410c2fba KL |
1791 | && TREE_CODE (TREE_TYPE (parm)) != TEMPLATE_TYPE_PARM |
1792 | && TREE_CODE (TREE_TYPE (parm)) != TYPENAME_TYPE) | |
8d08fdba | 1793 | { |
8251199e | 1794 | cp_error ("`%#T' is not a valid type for a template constant parameter", |
c91a56d2 MS |
1795 | TREE_TYPE (parm)); |
1796 | if (DECL_NAME (parm) == NULL_TREE) | |
8251199e | 1797 | error (" a template type parameter must begin with `class' or `typename'"); |
8d08fdba MS |
1798 | TREE_TYPE (parm) = void_type_node; |
1799 | } | |
37c46b43 MS |
1800 | else if (pedantic |
1801 | && (TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE | |
1802 | || TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE)) | |
8251199e | 1803 | cp_pedwarn ("`%T' is not a valid type for a template constant parameter", |
eb66be0e | 1804 | TREE_TYPE (parm)); |
8d08fdba | 1805 | decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm)); |
f84b4be9 JM |
1806 | DECL_INITIAL (parm) = DECL_INITIAL (decl) |
1807 | = build_template_parm_index (idx, processing_template_decl, | |
1808 | processing_template_decl, | |
1809 | decl, TREE_TYPE (parm)); | |
8d08fdba MS |
1810 | } |
1811 | else | |
1812 | { | |
73b0fce8 KL |
1813 | tree t; |
1814 | parm = TREE_VALUE (parm); | |
1815 | ||
1816 | if (parm && TREE_CODE (parm) == TEMPLATE_DECL) | |
1817 | { | |
33848bb0 | 1818 | t = make_aggr_type (TEMPLATE_TEMPLATE_PARM); |
73b0fce8 KL |
1819 | /* This is for distinguishing between real templates and template |
1820 | template parameters */ | |
1821 | TREE_TYPE (parm) = t; | |
1822 | TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t; | |
1823 | decl = parm; | |
1824 | } | |
1825 | else | |
1826 | { | |
33848bb0 | 1827 | t = make_aggr_type (TEMPLATE_TYPE_PARM); |
73b0fce8 KL |
1828 | /* parm is either IDENTIFIER_NODE or NULL_TREE */ |
1829 | decl = build_decl (TYPE_DECL, parm, t); | |
1830 | } | |
1831 | ||
d2e5ee5c MS |
1832 | TYPE_NAME (t) = decl; |
1833 | TYPE_STUB_DECL (t) = decl; | |
a292b002 | 1834 | parm = decl; |
f84b4be9 JM |
1835 | TEMPLATE_TYPE_PARM_INDEX (t) |
1836 | = build_template_parm_index (idx, processing_template_decl, | |
1837 | processing_template_decl, | |
1838 | decl, TREE_TYPE (parm)); | |
8d08fdba | 1839 | } |
8ccc31eb | 1840 | SET_DECL_ARTIFICIAL (decl); |
cd9f6678 | 1841 | SET_DECL_TEMPLATE_PARM_P (decl); |
8d08fdba | 1842 | pushdecl (decl); |
a292b002 | 1843 | parm = build_tree_list (defval, parm); |
8d08fdba MS |
1844 | return chainon (list, parm); |
1845 | } | |
1846 | ||
1847 | /* The end of a template parameter list has been reached. Process the | |
1848 | tree list into a parameter vector, converting each parameter into a more | |
1849 | useful form. Type parameters are saved as IDENTIFIER_NODEs, and others | |
1850 | as PARM_DECLs. */ | |
1851 | ||
1852 | tree | |
1853 | end_template_parm_list (parms) | |
1854 | tree parms; | |
1855 | { | |
5566b478 | 1856 | int nparms; |
8d08fdba | 1857 | tree parm; |
5566b478 MS |
1858 | tree saved_parmlist = make_tree_vec (list_length (parms)); |
1859 | ||
5566b478 MS |
1860 | current_template_parms |
1861 | = tree_cons (build_int_2 (0, processing_template_decl), | |
1862 | saved_parmlist, current_template_parms); | |
8d08fdba | 1863 | |
91e490ab MM |
1864 | for (parm = parms, nparms = 0; |
1865 | parm; | |
1866 | parm = TREE_CHAIN (parm), nparms++) | |
66191c20 | 1867 | TREE_VEC_ELT (saved_parmlist, nparms) = parm; |
a292b002 | 1868 | |
67ffc812 MM |
1869 | --processing_template_parmlist; |
1870 | ||
8d08fdba MS |
1871 | return saved_parmlist; |
1872 | } | |
1873 | ||
5566b478 MS |
1874 | /* end_template_decl is called after a template declaration is seen. */ |
1875 | ||
8d08fdba | 1876 | void |
5566b478 | 1877 | end_template_decl () |
8d08fdba | 1878 | { |
386b8a85 JM |
1879 | reset_specialization (); |
1880 | ||
5156628f | 1881 | if (! processing_template_decl) |
73aad9b9 JM |
1882 | return; |
1883 | ||
5566b478 | 1884 | /* This matches the pushlevel in begin_template_parm_list. */ |
74b846e0 | 1885 | finish_scope (); |
8d08fdba | 1886 | |
5566b478 MS |
1887 | --processing_template_decl; |
1888 | current_template_parms = TREE_CHAIN (current_template_parms); | |
5566b478 | 1889 | } |
8d08fdba | 1890 | |
36a117a5 MM |
1891 | /* Given a template argument vector containing the template PARMS. |
1892 | The innermost PARMS are given first. */ | |
9a3b49ac MS |
1893 | |
1894 | tree | |
1895 | current_template_args () | |
5566b478 | 1896 | { |
36a117a5 | 1897 | tree header; |
b370501f | 1898 | tree args = NULL_TREE; |
36a117a5 | 1899 | int length = TMPL_PARMS_DEPTH (current_template_parms); |
98c1c668 JM |
1900 | int l = length; |
1901 | ||
36a117a5 MM |
1902 | /* If there is only one level of template parameters, we do not |
1903 | create a TREE_VEC of TREE_VECs. Instead, we return a single | |
1904 | TREE_VEC containing the arguments. */ | |
1905 | if (length > 1) | |
1906 | args = make_tree_vec (length); | |
1907 | ||
1908 | for (header = current_template_parms; header; header = TREE_CHAIN (header)) | |
8d08fdba | 1909 | { |
5566b478 | 1910 | tree a = copy_node (TREE_VALUE (header)); |
36a117a5 MM |
1911 | int i; |
1912 | ||
5566b478 | 1913 | TREE_TYPE (a) = NULL_TREE; |
36a117a5 | 1914 | for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i) |
5566b478 | 1915 | { |
98c1c668 JM |
1916 | tree t = TREE_VEC_ELT (a, i); |
1917 | ||
36a117a5 | 1918 | /* T will be a list if we are called from within a |
98c1c668 JM |
1919 | begin/end_template_parm_list pair, but a vector directly |
1920 | if within a begin/end_member_template_processing pair. */ | |
1921 | if (TREE_CODE (t) == TREE_LIST) | |
1922 | { | |
1923 | t = TREE_VALUE (t); | |
1924 | ||
73b0fce8 KL |
1925 | if (TREE_CODE (t) == TYPE_DECL |
1926 | || TREE_CODE (t) == TEMPLATE_DECL) | |
98c1c668 JM |
1927 | t = TREE_TYPE (t); |
1928 | else | |
1929 | t = DECL_INITIAL (t); | |
36a117a5 | 1930 | TREE_VEC_ELT (a, i) = t; |
98c1c668 | 1931 | } |
5566b478 | 1932 | } |
36a117a5 MM |
1933 | |
1934 | if (length > 1) | |
1935 | TREE_VEC_ELT (args, --l) = a; | |
1936 | else | |
1937 | args = a; | |
8d08fdba MS |
1938 | } |
1939 | ||
9a3b49ac MS |
1940 | return args; |
1941 | } | |
75650646 | 1942 | |
e1467ff2 MM |
1943 | /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated |
1944 | template PARMS. Used by push_template_decl below. */ | |
1945 | ||
75650646 MM |
1946 | static tree |
1947 | build_template_decl (decl, parms) | |
1948 | tree decl; | |
1949 | tree parms; | |
1950 | { | |
1951 | tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE); | |
1952 | DECL_TEMPLATE_PARMS (tmpl) = parms; | |
1953 | DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl); | |
1954 | if (DECL_LANG_SPECIFIC (decl)) | |
1955 | { | |
4f1c5b7d | 1956 | DECL_VIRTUAL_CONTEXT (tmpl) = DECL_VIRTUAL_CONTEXT (decl); |
8f032717 MM |
1957 | DECL_STATIC_FUNCTION_P (tmpl) = DECL_STATIC_FUNCTION_P (decl); |
1958 | DECL_CONSTRUCTOR_P (tmpl) = DECL_CONSTRUCTOR_P (decl); | |
11f98788 | 1959 | DECL_NONCONVERTING_P (tmpl) = DECL_NONCONVERTING_P (decl); |
75650646 MM |
1960 | } |
1961 | ||
1962 | return tmpl; | |
1963 | } | |
1964 | ||
050367a3 MM |
1965 | struct template_parm_data |
1966 | { | |
6c30752f MM |
1967 | /* The level of the template parameters we are currently |
1968 | processing. */ | |
050367a3 | 1969 | int level; |
6c30752f MM |
1970 | |
1971 | /* The index of the specialization argument we are currently | |
1972 | processing. */ | |
1973 | int current_arg; | |
1974 | ||
1975 | /* An array whose size is the number of template parameters. The | |
1976 | elements are non-zero if the parameter has been used in any one | |
1977 | of the arguments processed so far. */ | |
050367a3 | 1978 | int* parms; |
6c30752f MM |
1979 | |
1980 | /* An array whose size is the number of template arguments. The | |
1981 | elements are non-zero if the argument makes use of template | |
1982 | parameters of this level. */ | |
1983 | int* arg_uses_template_parms; | |
050367a3 MM |
1984 | }; |
1985 | ||
1986 | /* Subroutine of push_template_decl used to see if each template | |
1987 | parameter in a partial specialization is used in the explicit | |
1988 | argument list. If T is of the LEVEL given in DATA (which is | |
1989 | treated as a template_parm_data*), then DATA->PARMS is marked | |
1990 | appropriately. */ | |
1991 | ||
1992 | static int | |
1993 | mark_template_parm (t, data) | |
1994 | tree t; | |
1995 | void* data; | |
1996 | { | |
1997 | int level; | |
1998 | int idx; | |
1999 | struct template_parm_data* tpd = (struct template_parm_data*) data; | |
2000 | ||
2001 | if (TREE_CODE (t) == TEMPLATE_PARM_INDEX) | |
2002 | { | |
2003 | level = TEMPLATE_PARM_LEVEL (t); | |
2004 | idx = TEMPLATE_PARM_IDX (t); | |
2005 | } | |
2006 | else | |
2007 | { | |
2008 | level = TEMPLATE_TYPE_LEVEL (t); | |
2009 | idx = TEMPLATE_TYPE_IDX (t); | |
2010 | } | |
2011 | ||
2012 | if (level == tpd->level) | |
6c30752f MM |
2013 | { |
2014 | tpd->parms[idx] = 1; | |
2015 | tpd->arg_uses_template_parms[tpd->current_arg] = 1; | |
2016 | } | |
050367a3 MM |
2017 | |
2018 | /* Return zero so that for_each_template_parm will continue the | |
2019 | traversal of the tree; we want to mark *every* template parm. */ | |
2020 | return 0; | |
2021 | } | |
2022 | ||
6c30752f MM |
2023 | /* Process the partial specialization DECL. */ |
2024 | ||
e9659ab0 | 2025 | static tree |
6c30752f MM |
2026 | process_partial_specialization (decl) |
2027 | tree decl; | |
2028 | { | |
2029 | tree type = TREE_TYPE (decl); | |
2030 | tree maintmpl = CLASSTYPE_TI_TEMPLATE (type); | |
2031 | tree specargs = CLASSTYPE_TI_ARGS (type); | |
2032 | tree inner_args = innermost_args (specargs); | |
2033 | tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms); | |
2034 | tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl); | |
2035 | int nargs = TREE_VEC_LENGTH (inner_args); | |
2036 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2037 | int i; | |
2038 | int did_error_intro = 0; | |
6c30752f MM |
2039 | struct template_parm_data tpd; |
2040 | struct template_parm_data tpd2; | |
2041 | ||
6c30752f MM |
2042 | /* We check that each of the template parameters given in the |
2043 | partial specialization is used in the argument list to the | |
2044 | specialization. For example: | |
2045 | ||
2046 | template <class T> struct S; | |
2047 | template <class T> struct S<T*>; | |
2048 | ||
2049 | The second declaration is OK because `T*' uses the template | |
2050 | parameter T, whereas | |
2051 | ||
2052 | template <class T> struct S<int>; | |
2053 | ||
2054 | is no good. Even trickier is: | |
2055 | ||
2056 | template <class T> | |
2057 | struct S1 | |
2058 | { | |
2059 | template <class U> | |
2060 | struct S2; | |
2061 | template <class U> | |
2062 | struct S2<T>; | |
2063 | }; | |
2064 | ||
2065 | The S2<T> declaration is actually illegal; it is a | |
2066 | full-specialization. Of course, | |
2067 | ||
2068 | template <class U> | |
2069 | struct S2<T (*)(U)>; | |
2070 | ||
2071 | or some such would have been OK. */ | |
2072 | tpd.level = TMPL_PARMS_DEPTH (current_template_parms); | |
2073 | tpd.parms = alloca (sizeof (int) * ntparms); | |
1ddb2906 | 2074 | bzero ((PTR) tpd.parms, sizeof (int) * ntparms); |
6c30752f MM |
2075 | |
2076 | tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs); | |
1ddb2906 | 2077 | bzero ((PTR) tpd.arg_uses_template_parms, sizeof (int) * nargs); |
6c30752f MM |
2078 | for (i = 0; i < nargs; ++i) |
2079 | { | |
2080 | tpd.current_arg = i; | |
2081 | for_each_template_parm (TREE_VEC_ELT (inner_args, i), | |
2082 | &mark_template_parm, | |
2083 | &tpd); | |
2084 | } | |
2085 | for (i = 0; i < ntparms; ++i) | |
2086 | if (tpd.parms[i] == 0) | |
2087 | { | |
2088 | /* One of the template parms was not used in the | |
2089 | specialization. */ | |
2090 | if (!did_error_intro) | |
2091 | { | |
8251199e | 2092 | cp_error ("template parameters not used in partial specialization:"); |
6c30752f MM |
2093 | did_error_intro = 1; |
2094 | } | |
2095 | ||
8251199e | 2096 | cp_error (" `%D'", |
6c30752f MM |
2097 | TREE_VALUE (TREE_VEC_ELT (inner_parms, i))); |
2098 | } | |
2099 | ||
2100 | /* [temp.class.spec] | |
2101 | ||
2102 | The argument list of the specialization shall not be identical to | |
2103 | the implicit argument list of the primary template. */ | |
2104 | if (comp_template_args (inner_args, | |
2105 | innermost_args (CLASSTYPE_TI_ARGS (TREE_TYPE | |
2106 | (maintmpl))))) | |
8251199e | 2107 | cp_error ("partial specialization `%T' does not specialize any template arguments", type); |
6c30752f MM |
2108 | |
2109 | /* [temp.class.spec] | |
2110 | ||
2111 | A partially specialized non-type argument expression shall not | |
2112 | involve template parameters of the partial specialization except | |
2113 | when the argument expression is a simple identifier. | |
2114 | ||
2115 | The type of a template parameter corresponding to a specialized | |
2116 | non-type argument shall not be dependent on a parameter of the | |
2117 | specialization. */ | |
2118 | my_friendly_assert (nargs == DECL_NTPARMS (maintmpl), 0); | |
2119 | tpd2.parms = 0; | |
2120 | for (i = 0; i < nargs; ++i) | |
2121 | { | |
2122 | tree arg = TREE_VEC_ELT (inner_args, i); | |
2123 | if (/* These first two lines are the `non-type' bit. */ | |
2f939d94 | 2124 | !TYPE_P (arg) |
6c30752f MM |
2125 | && TREE_CODE (arg) != TEMPLATE_DECL |
2126 | /* This next line is the `argument expression is not just a | |
2127 | simple identifier' condition and also the `specialized | |
2128 | non-type argument' bit. */ | |
2129 | && TREE_CODE (arg) != TEMPLATE_PARM_INDEX) | |
2130 | { | |
2131 | if (tpd.arg_uses_template_parms[i]) | |
8251199e | 2132 | cp_error ("template argument `%E' involves template parameter(s)", arg); |
6c30752f MM |
2133 | else |
2134 | { | |
2135 | /* Look at the corresponding template parameter, | |
2136 | marking which template parameters its type depends | |
2137 | upon. */ | |
2138 | tree type = | |
2139 | TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms, | |
2140 | i))); | |
2141 | ||
2142 | if (!tpd2.parms) | |
2143 | { | |
2144 | /* We haven't yet initialized TPD2. Do so now. */ | |
2145 | tpd2.arg_uses_template_parms | |
2146 | = (int*) alloca (sizeof (int) * nargs); | |
104bf76a | 2147 | /* The number of parameters here is the number in the |
76a83782 RH |
2148 | main template, which, as checked in the assertion |
2149 | above, is NARGS. */ | |
6c30752f MM |
2150 | tpd2.parms = (int*) alloca (sizeof (int) * nargs); |
2151 | tpd2.level = | |
2152 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl)); | |
2153 | } | |
2154 | ||
104bf76a | 2155 | /* Mark the template parameters. But this time, we're |
6c30752f MM |
2156 | looking for the template parameters of the main |
2157 | template, not in the specialization. */ | |
2158 | tpd2.current_arg = i; | |
2159 | tpd2.arg_uses_template_parms[i] = 0; | |
1ddb2906 | 2160 | bzero ((PTR) tpd2.parms, sizeof (int) * nargs); |
6c30752f MM |
2161 | for_each_template_parm (type, |
2162 | &mark_template_parm, | |
2163 | &tpd2); | |
2164 | ||
2165 | if (tpd2.arg_uses_template_parms [i]) | |
2166 | { | |
2167 | /* The type depended on some template parameters. | |
2168 | If they are fully specialized in the | |
2169 | specialization, that's OK. */ | |
2170 | int j; | |
2171 | for (j = 0; j < nargs; ++j) | |
2172 | if (tpd2.parms[j] != 0 | |
2173 | && tpd.arg_uses_template_parms [j]) | |
2174 | { | |
104bf76a | 2175 | cp_error ("type `%T' of template argument `%E' depends on template parameter(s)", |
6c30752f MM |
2176 | type, |
2177 | arg); | |
2178 | break; | |
2179 | } | |
2180 | } | |
2181 | } | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | if (retrieve_specialization (maintmpl, specargs)) | |
2186 | /* We've already got this specialization. */ | |
2187 | return decl; | |
2188 | ||
d8b64f80 | 2189 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl) |
e1b3e07d MM |
2190 | = tree_cons (inner_args, inner_parms, |
2191 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)); | |
6c30752f MM |
2192 | TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type; |
2193 | return decl; | |
2194 | } | |
2195 | ||
6ba89f8e MM |
2196 | /* Check that a template declaration's use of default arguments is not |
2197 | invalid. Here, PARMS are the template parameters. IS_PRIMARY is | |
2198 | non-zero if DECL is the thing declared by a primary template. | |
2199 | IS_PARTIAL is non-zero if DECL is a partial specialization. */ | |
2200 | ||
2201 | static void | |
2202 | check_default_tmpl_args (decl, parms, is_primary, is_partial) | |
2203 | tree decl; | |
2204 | tree parms; | |
2205 | int is_primary; | |
2206 | int is_partial; | |
2207 | { | |
d8e178a0 | 2208 | const char *msg; |
66191c20 MM |
2209 | int last_level_to_check; |
2210 | tree parm_level; | |
6ba89f8e MM |
2211 | |
2212 | /* [temp.param] | |
2213 | ||
2214 | A default template-argument shall not be specified in a | |
2215 | function template declaration or a function template definition, nor | |
2216 | in the template-parameter-list of the definition of a member of a | |
2217 | class template. */ | |
2218 | ||
4f1c5b7d | 2219 | if (TREE_CODE (CP_DECL_CONTEXT (decl)) == FUNCTION_DECL) |
e0942dcd MM |
2220 | /* You can't have a function template declaration in a local |
2221 | scope, nor you can you define a member of a class template in a | |
2222 | local scope. */ | |
2223 | return; | |
2224 | ||
6ba89f8e MM |
2225 | if (current_class_type |
2226 | && !TYPE_BEING_DEFINED (current_class_type) | |
3d7de1fa | 2227 | && DECL_LANG_SPECIFIC (decl) |
5937a6f9 MM |
2228 | /* If this is either a friend defined in the scope of the class |
2229 | or a member function. */ | |
4f1c5b7d MM |
2230 | && ((DECL_CONTEXT (decl) |
2231 | && same_type_p (DECL_CONTEXT (decl), current_class_type)) | |
2232 | || (DECL_FRIEND_CONTEXT (decl) | |
2233 | && same_type_p (DECL_FRIEND_CONTEXT (decl), | |
2234 | current_class_type))) | |
5937a6f9 MM |
2235 | /* And, if it was a member function, it really was defined in |
2236 | the scope of the class. */ | |
2237 | && (!DECL_FUNCTION_MEMBER_P (decl) || DECL_DEFINED_IN_CLASS_P (decl))) | |
6ba89f8e | 2238 | /* We already checked these parameters when the template was |
5937a6f9 MM |
2239 | declared, so there's no need to do it again now. This function |
2240 | was defined in class scope, but we're processing it's body now | |
2241 | that the class is complete. */ | |
6ba89f8e MM |
2242 | return; |
2243 | ||
66191c20 MM |
2244 | /* [temp.param] |
2245 | ||
2246 | If a template-parameter has a default template-argument, all | |
2247 | subsequent template-parameters shall have a default | |
2248 | template-argument supplied. */ | |
2249 | for (parm_level = parms; parm_level; parm_level = TREE_CHAIN (parm_level)) | |
2250 | { | |
2251 | tree inner_parms = TREE_VALUE (parm_level); | |
2252 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
2253 | int seen_def_arg_p = 0; | |
2254 | int i; | |
2255 | ||
2256 | for (i = 0; i < ntparms; ++i) | |
2257 | { | |
2258 | tree parm = TREE_VEC_ELT (inner_parms, i); | |
2259 | if (TREE_PURPOSE (parm)) | |
2260 | seen_def_arg_p = 1; | |
2261 | else if (seen_def_arg_p) | |
2262 | { | |
2263 | cp_error ("no default argument for `%D'", TREE_VALUE (parm)); | |
2264 | /* For better subsequent error-recovery, we indicate that | |
2265 | there should have been a default argument. */ | |
2266 | TREE_PURPOSE (parm) = error_mark_node; | |
2267 | } | |
2268 | } | |
2269 | } | |
2270 | ||
6ba89f8e MM |
2271 | if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary) |
2272 | /* For an ordinary class template, default template arguments are | |
2273 | allowed at the innermost level, e.g.: | |
2274 | template <class T = int> | |
2275 | struct S {}; | |
2276 | but, in a partial specialization, they're not allowed even | |
2277 | there, as we have in [temp.class.spec]: | |
2278 | ||
2279 | The template parameter list of a specialization shall not | |
2280 | contain default template argument values. | |
2281 | ||
2282 | So, for a partial specialization, or for a function template, | |
2283 | we look at all of them. */ | |
2284 | ; | |
2285 | else | |
2286 | /* But, for a primary class template that is not a partial | |
2287 | specialization we look at all template parameters except the | |
2288 | innermost ones. */ | |
2289 | parms = TREE_CHAIN (parms); | |
2290 | ||
2291 | /* Figure out what error message to issue. */ | |
2292 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
2293 | msg = "default argument for template parameter in function template `%D'"; | |
2294 | else if (is_partial) | |
2295 | msg = "default argument in partial specialization `%D'"; | |
2296 | else | |
2297 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2298 | ||
2299 | if (current_class_type && TYPE_BEING_DEFINED (current_class_type)) | |
2300 | /* If we're inside a class definition, there's no need to | |
104bf76a | 2301 | examine the parameters to the class itself. On the one |
6ba89f8e MM |
2302 | hand, they will be checked when the class is defined, and, |
2303 | on the other, default arguments are legal in things like: | |
2304 | template <class T = double> | |
2305 | struct S { template <class U> void f(U); }; | |
2306 | Here the default argument for `S' has no bearing on the | |
2307 | declaration of `f'. */ | |
2308 | last_level_to_check = template_class_depth (current_class_type) + 1; | |
2309 | else | |
2310 | /* Check everything. */ | |
2311 | last_level_to_check = 0; | |
2312 | ||
66191c20 MM |
2313 | for (parm_level = parms; |
2314 | parm_level && TMPL_PARMS_DEPTH (parm_level) >= last_level_to_check; | |
2315 | parm_level = TREE_CHAIN (parm_level)) | |
6ba89f8e | 2316 | { |
66191c20 MM |
2317 | tree inner_parms = TREE_VALUE (parm_level); |
2318 | int i; | |
2319 | int ntparms; | |
6ba89f8e MM |
2320 | |
2321 | ntparms = TREE_VEC_LENGTH (inner_parms); | |
2322 | for (i = 0; i < ntparms; ++i) | |
2323 | if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i))) | |
2324 | { | |
2325 | if (msg) | |
2326 | { | |
2327 | cp_error (msg, decl); | |
2328 | msg = 0; | |
2329 | } | |
2330 | ||
2331 | /* Clear out the default argument so that we are not | |
2332 | confused later. */ | |
2333 | TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE; | |
2334 | } | |
2335 | ||
2336 | /* At this point, if we're still interested in issuing messages, | |
2337 | they must apply to classes surrounding the object declared. */ | |
2338 | if (msg) | |
2339 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2340 | } | |
2341 | } | |
2342 | ||
3ac3d9ea | 2343 | /* Creates a TEMPLATE_DECL for the indicated DECL using the template |
f84b4be9 JM |
2344 | parameters given by current_template_args, or reuses a |
2345 | previously existing one, if appropriate. Returns the DECL, or an | |
6757edfe MM |
2346 | equivalent one, if it is replaced via a call to duplicate_decls. |
2347 | ||
2348 | If IS_FRIEND is non-zero, DECL is a friend declaration. */ | |
3ac3d9ea MM |
2349 | |
2350 | tree | |
6757edfe | 2351 | push_template_decl_real (decl, is_friend) |
9a3b49ac | 2352 | tree decl; |
6757edfe | 2353 | int is_friend; |
9a3b49ac MS |
2354 | { |
2355 | tree tmpl; | |
f84b4be9 | 2356 | tree args; |
9a3b49ac | 2357 | tree info; |
f84b4be9 JM |
2358 | tree ctx; |
2359 | int primary; | |
6ba89f8e | 2360 | int is_partial; |
cfe507be | 2361 | int new_template_p = 0; |
6ba89f8e MM |
2362 | |
2363 | /* See if this is a partial specialization. */ | |
9188c363 | 2364 | is_partial = (DECL_IMPLICIT_TYPEDEF_P (decl) |
6ba89f8e | 2365 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE |
370af2d5 | 2366 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl))); |
6757edfe MM |
2367 | |
2368 | is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl)); | |
f84b4be9 JM |
2369 | |
2370 | if (is_friend) | |
2371 | /* For a friend, we want the context of the friend function, not | |
2372 | the type of which it is a friend. */ | |
2373 | ctx = DECL_CONTEXT (decl); | |
4f1c5b7d MM |
2374 | else if (CP_DECL_CONTEXT (decl) |
2375 | && TREE_CODE (CP_DECL_CONTEXT (decl)) != NAMESPACE_DECL) | |
f84b4be9 JM |
2376 | /* In the case of a virtual function, we want the class in which |
2377 | it is defined. */ | |
4f1c5b7d | 2378 | ctx = CP_DECL_CONTEXT (decl); |
f84b4be9 JM |
2379 | else |
2380 | /* Otherwise, if we're currently definining some class, the DECL | |
2381 | is assumed to be a member of the class. */ | |
9188c363 | 2382 | ctx = current_scope (); |
f84b4be9 | 2383 | |
2c73f9f5 ML |
2384 | if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL) |
2385 | ctx = NULL_TREE; | |
2386 | ||
2387 | if (!DECL_CONTEXT (decl)) | |
cb0dbb9a | 2388 | DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace); |
2c73f9f5 | 2389 | |
6ba89f8e | 2390 | /* See if this is a primary template. */ |
74b846e0 | 2391 | primary = template_parm_scope_p (); |
9a3b49ac | 2392 | |
83566abf JM |
2393 | if (primary) |
2394 | { | |
2395 | if (current_lang_name == lang_name_c) | |
8251199e | 2396 | cp_error ("template with C linkage"); |
4ce3d537 MM |
2397 | else if (TREE_CODE (decl) == TYPE_DECL |
2398 | && ANON_AGGRNAME_P (DECL_NAME (decl))) | |
8251199e | 2399 | cp_error ("template class without a name"); |
2aaf816d JM |
2400 | else if ((DECL_IMPLICIT_TYPEDEF_P (decl) |
2401 | && CLASS_TYPE_P (TREE_TYPE (decl))) | |
2402 | || (TREE_CODE (decl) == VAR_DECL && ctx && CLASS_TYPE_P (ctx)) | |
2403 | || TREE_CODE (decl) == FUNCTION_DECL) | |
2404 | /* OK */; | |
2405 | else | |
4ce3d537 | 2406 | cp_error ("template declaration of `%#D'", decl); |
83566abf JM |
2407 | } |
2408 | ||
6ba89f8e MM |
2409 | /* Check to see that the rules regarding the use of default |
2410 | arguments are not being violated. */ | |
2411 | check_default_tmpl_args (decl, current_template_parms, | |
2412 | primary, is_partial); | |
73aad9b9 | 2413 | |
6ba89f8e MM |
2414 | if (is_partial) |
2415 | return process_partial_specialization (decl); | |
d32789d8 | 2416 | |
9a3b49ac MS |
2417 | args = current_template_args (); |
2418 | ||
f84b4be9 JM |
2419 | if (!ctx |
2420 | || TREE_CODE (ctx) == FUNCTION_DECL | |
2421 | || TYPE_BEING_DEFINED (ctx) | |
2422 | || (is_friend && !DECL_TEMPLATE_INFO (decl))) | |
8d08fdba | 2423 | { |
75650646 | 2424 | if (DECL_LANG_SPECIFIC (decl) |
f84b4be9 JM |
2425 | && DECL_TEMPLATE_INFO (decl) |
2426 | && DECL_TI_TEMPLATE (decl)) | |
2427 | tmpl = DECL_TI_TEMPLATE (decl); | |
1c10870d AS |
2428 | /* If DECL is a TYPE_DECL for a class-template, then there won't |
2429 | be DECL_LANG_SPECIFIC. The information equivalent to | |
2430 | DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */ | |
2431 | else if (DECL_IMPLICIT_TYPEDEF_P (decl) | |
2432 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2433 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2434 | { | |
2435 | /* Since a template declaration already existed for this | |
2436 | class-type, we must be redeclaring it here. Make sure | |
2437 | that the redeclaration is legal. */ | |
2438 | redeclare_class_template (TREE_TYPE (decl), | |
2439 | current_template_parms); | |
2440 | /* We don't need to create a new TEMPLATE_DECL; just use the | |
2441 | one we already had. */ | |
2442 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
2443 | } | |
f84b4be9 | 2444 | else |
786b5245 | 2445 | { |
f84b4be9 | 2446 | tmpl = build_template_decl (decl, current_template_parms); |
cfe507be MM |
2447 | new_template_p = 1; |
2448 | ||
f84b4be9 JM |
2449 | if (DECL_LANG_SPECIFIC (decl) |
2450 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
2451 | { | |
2452 | /* A specialization of a member template of a template | |
2453 | class. */ | |
2454 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
2455 | DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl); | |
2456 | DECL_TEMPLATE_INFO (decl) = NULL_TREE; | |
2457 | } | |
786b5245 | 2458 | } |
8d08fdba MS |
2459 | } |
2460 | else | |
2461 | { | |
e1a5ccf7 | 2462 | tree a, t, current, parms; |
ba4f4e5d | 2463 | int i; |
6633d636 | 2464 | |
6b9ab5cc MM |
2465 | if (TREE_CODE (decl) == TYPE_DECL) |
2466 | { | |
ed44da02 MM |
2467 | if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl))) |
2468 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
2469 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2470 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2471 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
6b9ab5cc MM |
2472 | else |
2473 | { | |
8251199e | 2474 | cp_error ("`%D' does not declare a template type", decl); |
6b9ab5cc MM |
2475 | return decl; |
2476 | } | |
2477 | } | |
fc378698 | 2478 | else if (! DECL_TEMPLATE_INFO (decl)) |
c91a56d2 | 2479 | { |
8251199e | 2480 | cp_error ("template definition of non-template `%#D'", decl); |
3ac3d9ea | 2481 | return decl; |
c91a56d2 | 2482 | } |
8d08fdba | 2483 | else |
5566b478 | 2484 | tmpl = DECL_TI_TEMPLATE (decl); |
98c1c668 | 2485 | |
e1a5ccf7 JM |
2486 | if (is_member_template (tmpl) |
2487 | && DECL_FUNCTION_TEMPLATE_P (tmpl) | |
2488 | && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl) | |
2489 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
98c1c668 | 2490 | { |
e1a5ccf7 JM |
2491 | tree new_tmpl; |
2492 | ||
2493 | /* The declaration is a specialization of a member | |
2494 | template, declared outside the class. Therefore, the | |
2495 | innermost template arguments will be NULL, so we | |
2496 | replace them with the arguments determined by the | |
2497 | earlier call to check_explicit_specialization. */ | |
2498 | args = DECL_TI_ARGS (decl); | |
2499 | ||
2500 | new_tmpl | |
2501 | = build_template_decl (decl, current_template_parms); | |
2502 | DECL_TEMPLATE_RESULT (new_tmpl) = decl; | |
2503 | TREE_TYPE (new_tmpl) = TREE_TYPE (decl); | |
2504 | DECL_TI_TEMPLATE (decl) = new_tmpl; | |
2505 | SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl); | |
e1b3e07d MM |
2506 | DECL_TEMPLATE_INFO (new_tmpl) |
2507 | = tree_cons (tmpl, args, NULL_TREE); | |
e1a5ccf7 JM |
2508 | |
2509 | register_specialization (new_tmpl, tmpl, args); | |
2510 | return decl; | |
98c1c668 | 2511 | } |
98c1c668 | 2512 | |
e1a5ccf7 | 2513 | /* Make sure the template headers we got make sense. */ |
6633d636 | 2514 | |
e1a5ccf7 JM |
2515 | parms = DECL_TEMPLATE_PARMS (tmpl); |
2516 | i = TMPL_PARMS_DEPTH (parms); | |
2517 | if (TMPL_ARGS_DEPTH (args) != i) | |
98c1c668 | 2518 | { |
e1a5ccf7 JM |
2519 | cp_error ("expected %d levels of template parms for `%#D', got %d", |
2520 | i, decl, TMPL_ARGS_DEPTH (args)); | |
98c1c668 | 2521 | } |
e1a5ccf7 JM |
2522 | else |
2523 | for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms)) | |
2524 | { | |
2525 | a = TMPL_ARGS_LEVEL (args, i); | |
2526 | t = INNERMOST_TEMPLATE_PARMS (parms); | |
2527 | ||
2528 | if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a)) | |
2529 | { | |
2530 | if (current == decl) | |
2531 | cp_error ("got %d template parameters for `%#D'", | |
2532 | TREE_VEC_LENGTH (a), decl); | |
2533 | else | |
2534 | cp_error ("got %d template parameters for `%#T'", | |
2535 | TREE_VEC_LENGTH (a), current); | |
2536 | cp_error (" but %d required", TREE_VEC_LENGTH (t)); | |
2537 | } | |
98c1c668 | 2538 | |
e1a5ccf7 JM |
2539 | /* Perhaps we should also check that the parms are used in the |
2540 | appropriate qualifying scopes in the declarator? */ | |
6633d636 | 2541 | |
e1a5ccf7 JM |
2542 | if (current == decl) |
2543 | current = ctx; | |
2544 | else | |
2545 | current = TYPE_CONTEXT (current); | |
2546 | } | |
5566b478 | 2547 | } |
8d08fdba | 2548 | |
5566b478 MS |
2549 | DECL_TEMPLATE_RESULT (tmpl) = decl; |
2550 | TREE_TYPE (tmpl) = TREE_TYPE (decl); | |
8d08fdba | 2551 | |
36a117a5 MM |
2552 | /* Push template declarations for global functions and types. Note |
2553 | that we do not try to push a global template friend declared in a | |
2554 | template class; such a thing may well depend on the template | |
39c01e4c | 2555 | parameters of the class. */ |
cfe507be | 2556 | if (new_template_p && !ctx |
36a117a5 | 2557 | && !(is_friend && template_class_depth (current_class_type) > 0)) |
2c73f9f5 | 2558 | tmpl = pushdecl_namespace_level (tmpl); |
8d08fdba | 2559 | |
5566b478 | 2560 | if (primary) |
6757edfe | 2561 | DECL_PRIMARY_TEMPLATE (tmpl) = tmpl; |
5566b478 | 2562 | |
e1b3e07d | 2563 | info = tree_cons (tmpl, args, NULL_TREE); |
5566b478 | 2564 | |
9188c363 | 2565 | if (DECL_IMPLICIT_TYPEDEF_P (decl)) |
8d08fdba | 2566 | { |
ed44da02 MM |
2567 | SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info); |
2568 | if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL) | |
2569 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE) | |
75650646 | 2570 | DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl)); |
51c184be | 2571 | } |
2aaf816d | 2572 | else if (DECL_LANG_SPECIFIC (decl)) |
5566b478 | 2573 | DECL_TEMPLATE_INFO (decl) = info; |
3ac3d9ea MM |
2574 | |
2575 | return DECL_TEMPLATE_RESULT (tmpl); | |
8d08fdba MS |
2576 | } |
2577 | ||
6757edfe MM |
2578 | tree |
2579 | push_template_decl (decl) | |
2580 | tree decl; | |
2581 | { | |
2582 | return push_template_decl_real (decl, 0); | |
2583 | } | |
2584 | ||
2585 | /* Called when a class template TYPE is redeclared with the indicated | |
2586 | template PARMS, e.g.: | |
7fe6899f MM |
2587 | |
2588 | template <class T> struct S; | |
2589 | template <class T> struct S {}; */ | |
2590 | ||
2591 | void | |
6757edfe | 2592 | redeclare_class_template (type, parms) |
7fe6899f | 2593 | tree type; |
6757edfe | 2594 | tree parms; |
7fe6899f | 2595 | { |
3d7de1fa | 2596 | tree tmpl; |
6757edfe | 2597 | tree tmpl_parms; |
7fe6899f MM |
2598 | int i; |
2599 | ||
3d7de1fa MM |
2600 | if (!TYPE_TEMPLATE_INFO (type)) |
2601 | { | |
2602 | cp_error ("`%T' is not a template type", type); | |
2603 | return; | |
2604 | } | |
2605 | ||
2606 | tmpl = TYPE_TI_TEMPLATE (type); | |
7fe6899f MM |
2607 | if (!PRIMARY_TEMPLATE_P (tmpl)) |
2608 | /* The type is nested in some template class. Nothing to worry | |
2609 | about here; there are no new template parameters for the nested | |
2610 | type. */ | |
2611 | return; | |
2612 | ||
6757edfe MM |
2613 | parms = INNERMOST_TEMPLATE_PARMS (parms); |
2614 | tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl); | |
2615 | ||
7fe6899f MM |
2616 | if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms)) |
2617 | { | |
8251199e JM |
2618 | cp_error_at ("previous declaration `%D'", tmpl); |
2619 | cp_error ("used %d template parameter%s instead of %d", | |
7fe6899f MM |
2620 | TREE_VEC_LENGTH (tmpl_parms), |
2621 | TREE_VEC_LENGTH (tmpl_parms) == 1 ? "" : "s", | |
2622 | TREE_VEC_LENGTH (parms)); | |
2623 | return; | |
2624 | } | |
2625 | ||
2626 | for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i) | |
2627 | { | |
2628 | tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i)); | |
2629 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); | |
2630 | tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)); | |
2631 | tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i)); | |
2632 | ||
2633 | if (TREE_CODE (tmpl_parm) != TREE_CODE (parm)) | |
2634 | { | |
8251199e JM |
2635 | cp_error_at ("template parameter `%#D'", tmpl_parm); |
2636 | cp_error ("redeclared here as `%#D'", parm); | |
7fe6899f MM |
2637 | return; |
2638 | } | |
2639 | ||
2640 | if (tmpl_default != NULL_TREE && parm_default != NULL_TREE) | |
2641 | { | |
2642 | /* We have in [temp.param]: | |
2643 | ||
2644 | A template-parameter may not be given default arguments | |
2645 | by two different declarations in the same scope. */ | |
8251199e JM |
2646 | cp_error ("redefinition of default argument for `%#D'", parm); |
2647 | cp_error_at (" original definition appeared here", tmpl_parm); | |
7fe6899f MM |
2648 | return; |
2649 | } | |
2650 | ||
2651 | if (parm_default != NULL_TREE) | |
2652 | /* Update the previous template parameters (which are the ones | |
2653 | that will really count) with the new default value. */ | |
2654 | TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default; | |
7ce74c5e MM |
2655 | else if (tmpl_default != NULL_TREE) |
2656 | /* Update the new parameters, too; they'll be used as the | |
2657 | parameters for any members. */ | |
2658 | TREE_PURPOSE (TREE_VEC_ELT (parms, i)) = tmpl_default; | |
7fe6899f MM |
2659 | } |
2660 | } | |
75650646 | 2661 | |
75650646 MM |
2662 | /* Attempt to convert the non-type template parameter EXPR to the |
2663 | indicated TYPE. If the conversion is successful, return the | |
2664 | converted value. If the conversion is unsuccesful, return | |
2665 | NULL_TREE if we issued an error message, or error_mark_node if we | |
2666 | did not. We issue error messages for out-and-out bad template | |
2667 | parameters, but not simply because the conversion failed, since we | |
2668 | might be just trying to do argument deduction. By the time this | |
2669 | function is called, neither TYPE nor EXPR may make use of template | |
2670 | parameters. */ | |
2671 | ||
2672 | static tree | |
e1467ff2 | 2673 | convert_nontype_argument (type, expr) |
75650646 MM |
2674 | tree type; |
2675 | tree expr; | |
2676 | { | |
2677 | tree expr_type = TREE_TYPE (expr); | |
2678 | ||
2679 | /* A template-argument for a non-type, non-template | |
2680 | template-parameter shall be one of: | |
2681 | ||
2682 | --an integral constant-expression of integral or enumeration | |
2683 | type; or | |
2684 | ||
2685 | --the name of a non-type template-parameter; or | |
2686 | ||
2687 | --the name of an object or function with external linkage, | |
2688 | including function templates and function template-ids but | |
86052cc3 | 2689 | excluding non-static class members, expressed as id-expression; |
75650646 MM |
2690 | or |
2691 | ||
2692 | --the address of an object or function with external linkage, | |
2693 | including function templates and function template-ids but | |
2694 | excluding non-static class members, expressed as & id-expression | |
2695 | where the & is optional if the name refers to a function or | |
2696 | array; or | |
2697 | ||
2698 | --a pointer to member expressed as described in _expr.unary.op_. */ | |
2699 | ||
638dd8fc MM |
2700 | /* An integral constant-expression can include const variables or |
2701 | enumerators. Simplify things by folding them to their values, | |
2702 | unless we're about to bind the declaration to a reference | |
2703 | parameter. */ | |
2704 | if (INTEGRAL_TYPE_P (expr_type) && TREE_READONLY_DECL_P (expr) | |
2705 | && TREE_CODE (type) != REFERENCE_TYPE) | |
86052cc3 JM |
2706 | expr = decl_constant_value (expr); |
2707 | ||
7bf2682f MM |
2708 | if (is_overloaded_fn (expr)) |
2709 | /* OK for now. We'll check that it has external linkage later. | |
2710 | Check this first since if expr_type is the unknown_type_node | |
2711 | we would otherwise complain below. */ | |
2712 | ; | |
e08a8f45 MM |
2713 | else if (TYPE_PTRMEM_P (expr_type) |
2714 | || TYPE_PTRMEMFUNC_P (expr_type)) | |
2715 | { | |
2716 | if (TREE_CODE (expr) != PTRMEM_CST) | |
2717 | goto bad_argument; | |
2718 | } | |
f3400fe2 | 2719 | else if (TYPE_PTR_P (expr_type) |
e08a8f45 | 2720 | || TYPE_PTRMEM_P (expr_type) |
f3400fe2 JM |
2721 | || TREE_CODE (expr_type) == ARRAY_TYPE |
2722 | || TREE_CODE (type) == REFERENCE_TYPE | |
75650646 MM |
2723 | /* If expr is the address of an overloaded function, we |
2724 | will get the unknown_type_node at this point. */ | |
2725 | || expr_type == unknown_type_node) | |
2726 | { | |
2727 | tree referent; | |
49bf0d6f MM |
2728 | tree e = expr; |
2729 | STRIP_NOPS (e); | |
75650646 | 2730 | |
f3400fe2 JM |
2731 | if (TREE_CODE (type) == REFERENCE_TYPE |
2732 | || TREE_CODE (expr_type) == ARRAY_TYPE) | |
2733 | referent = e; | |
2734 | else | |
75650646 | 2735 | { |
f3400fe2 JM |
2736 | if (TREE_CODE (e) != ADDR_EXPR) |
2737 | { | |
2738 | bad_argument: | |
2739 | cp_error ("`%E' is not a valid template argument", expr); | |
e08a8f45 MM |
2740 | if (TYPE_PTR_P (expr_type)) |
2741 | { | |
2742 | if (TREE_CODE (TREE_TYPE (expr_type)) == FUNCTION_TYPE) | |
2743 | cp_error ("it must be the address of a function with external linkage"); | |
2744 | else | |
2745 | cp_error ("it must be the address of an object with external linkage"); | |
2746 | } | |
2747 | else if (TYPE_PTRMEM_P (expr_type) | |
2748 | || TYPE_PTRMEMFUNC_P (expr_type)) | |
2749 | cp_error ("it must be a pointer-to-member of the form `&X::Y'"); | |
2750 | ||
f3400fe2 JM |
2751 | return NULL_TREE; |
2752 | } | |
2753 | ||
2754 | referent = TREE_OPERAND (e, 0); | |
2755 | STRIP_NOPS (referent); | |
75650646 MM |
2756 | } |
2757 | ||
75650646 MM |
2758 | if (TREE_CODE (referent) == STRING_CST) |
2759 | { | |
b4f4233d | 2760 | cp_error ("string literal %E is not a valid template argument because it is the address of an object with static linkage", |
75650646 | 2761 | referent); |
75650646 MM |
2762 | return NULL_TREE; |
2763 | } | |
2764 | ||
2765 | if (is_overloaded_fn (referent)) | |
2766 | /* We'll check that it has external linkage later. */ | |
2767 | ; | |
2768 | else if (TREE_CODE (referent) != VAR_DECL) | |
2769 | goto bad_argument; | |
2770 | else if (!TREE_PUBLIC (referent)) | |
2771 | { | |
8251199e | 2772 | cp_error ("address of non-extern `%E' cannot be used as template argument", referent); |
75650646 MM |
2773 | return error_mark_node; |
2774 | } | |
2775 | } | |
f3400fe2 JM |
2776 | else if (INTEGRAL_TYPE_P (expr_type) |
2777 | || TYPE_PTRMEM_P (expr_type) | |
2778 | || TYPE_PTRMEMFUNC_P (expr_type) | |
2779 | /* The next two are g++ extensions. */ | |
2780 | || TREE_CODE (expr_type) == REAL_TYPE | |
2781 | || TREE_CODE (expr_type) == COMPLEX_TYPE) | |
75650646 | 2782 | { |
f3400fe2 JM |
2783 | if (! TREE_CONSTANT (expr)) |
2784 | { | |
2785 | non_constant: | |
2786 | cp_error ("non-constant `%E' cannot be used as template argument", | |
2787 | expr); | |
2788 | return NULL_TREE; | |
2789 | } | |
75650646 | 2790 | } |
75650646 MM |
2791 | else |
2792 | { | |
8251199e | 2793 | cp_error ("object `%E' cannot be used as template argument", expr); |
75650646 MM |
2794 | return NULL_TREE; |
2795 | } | |
2796 | ||
2797 | switch (TREE_CODE (type)) | |
2798 | { | |
2799 | case INTEGER_TYPE: | |
2800 | case BOOLEAN_TYPE: | |
2801 | case ENUMERAL_TYPE: | |
2802 | /* For a non-type template-parameter of integral or enumeration | |
2803 | type, integral promotions (_conv.prom_) and integral | |
2804 | conversions (_conv.integral_) are applied. */ | |
2805 | if (!INTEGRAL_TYPE_P (expr_type)) | |
2806 | return error_mark_node; | |
2807 | ||
2808 | /* It's safe to call digest_init in this case; we know we're | |
2809 | just converting one integral constant expression to another. */ | |
db02b6b9 | 2810 | expr = digest_init (type, expr, (tree*) 0); |
75650646 | 2811 | |
db02b6b9 | 2812 | if (TREE_CODE (expr) != INTEGER_CST) |
f3400fe2 | 2813 | /* Curiously, some TREE_CONSTANT integral expressions do not |
db02b6b9 MM |
2814 | simplify to integer constants. For example, `3 % 0', |
2815 | remains a TRUNC_MOD_EXPR. */ | |
2816 | goto non_constant; | |
2817 | ||
2818 | return expr; | |
2819 | ||
abff8e06 JM |
2820 | case REAL_TYPE: |
2821 | case COMPLEX_TYPE: | |
2822 | /* These are g++ extensions. */ | |
2823 | if (TREE_CODE (expr_type) != TREE_CODE (type)) | |
2824 | return error_mark_node; | |
2825 | ||
db02b6b9 MM |
2826 | expr = digest_init (type, expr, (tree*) 0); |
2827 | ||
2828 | if (TREE_CODE (expr) != REAL_CST) | |
2829 | goto non_constant; | |
2830 | ||
2831 | return expr; | |
abff8e06 | 2832 | |
75650646 MM |
2833 | case POINTER_TYPE: |
2834 | { | |
2835 | tree type_pointed_to = TREE_TYPE (type); | |
2836 | ||
2837 | if (TYPE_PTRMEM_P (type)) | |
93aa462d MM |
2838 | { |
2839 | tree e; | |
2840 | ||
2841 | /* For a non-type template-parameter of type pointer to data | |
2842 | member, qualification conversions (_conv.qual_) are | |
2843 | applied. */ | |
2844 | e = perform_qualification_conversions (type, expr); | |
2845 | if (TREE_CODE (e) == NOP_EXPR) | |
87533b37 MM |
2846 | /* The call to perform_qualification_conversions will |
2847 | insert a NOP_EXPR over EXPR to do express conversion, | |
2848 | if necessary. But, that will confuse us if we use | |
2849 | this (converted) template parameter to instantiate | |
2850 | another template; then the thing will not look like a | |
2851 | valid template argument. So, just make a new | |
2852 | constant, of the appropriate type. */ | |
2853 | e = make_ptrmem_cst (type, PTRMEM_CST_MEMBER (expr)); | |
93aa462d MM |
2854 | return e; |
2855 | } | |
75650646 MM |
2856 | else if (TREE_CODE (type_pointed_to) == FUNCTION_TYPE) |
2857 | { | |
2858 | /* For a non-type template-parameter of type pointer to | |
2859 | function, only the function-to-pointer conversion | |
2860 | (_conv.func_) is applied. If the template-argument | |
2861 | represents a set of overloaded functions (or a pointer to | |
2862 | such), the matching function is selected from the set | |
2863 | (_over.over_). */ | |
2864 | tree fns; | |
2865 | tree fn; | |
2866 | ||
7bf2682f | 2867 | if (TREE_CODE (expr) == ADDR_EXPR) |
75650646 MM |
2868 | fns = TREE_OPERAND (expr, 0); |
2869 | else | |
2870 | fns = expr; | |
2871 | ||
a05273d4 | 2872 | fn = instantiate_type (type_pointed_to, fns, 0); |
75650646 MM |
2873 | |
2874 | if (fn == error_mark_node) | |
2875 | return error_mark_node; | |
2876 | ||
2877 | if (!TREE_PUBLIC (fn)) | |
2878 | { | |
2879 | if (really_overloaded_fn (fns)) | |
2880 | return error_mark_node; | |
2881 | else | |
2882 | goto bad_argument; | |
2883 | } | |
2884 | ||
2885 | expr = build_unary_op (ADDR_EXPR, fn, 0); | |
2886 | ||
3bfdc719 | 2887 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
2888 | 0); |
2889 | return expr; | |
2890 | } | |
2891 | else | |
2892 | { | |
2893 | /* For a non-type template-parameter of type pointer to | |
2894 | object, qualification conversions (_conv.qual_) and the | |
2895 | array-to-pointer conversion (_conv.array_) are applied. | |
2896 | [Note: In particular, neither the null pointer conversion | |
2897 | (_conv.ptr_) nor the derived-to-base conversion | |
2898 | (_conv.ptr_) are applied. Although 0 is a valid | |
2899 | template-argument for a non-type template-parameter of | |
2900 | integral type, it is not a valid template-argument for a | |
e1467ff2 MM |
2901 | non-type template-parameter of pointer type.] |
2902 | ||
2903 | The call to decay_conversion performs the | |
2904 | array-to-pointer conversion, if appropriate. */ | |
2905 | expr = decay_conversion (expr); | |
75650646 MM |
2906 | |
2907 | if (expr == error_mark_node) | |
2908 | return error_mark_node; | |
2909 | else | |
2910 | return perform_qualification_conversions (type, expr); | |
2911 | } | |
2912 | } | |
2913 | break; | |
2914 | ||
2915 | case REFERENCE_TYPE: | |
2916 | { | |
2917 | tree type_referred_to = TREE_TYPE (type); | |
2918 | ||
2919 | if (TREE_CODE (type_referred_to) == FUNCTION_TYPE) | |
2920 | { | |
2921 | /* For a non-type template-parameter of type reference to | |
39c01e4c MM |
2922 | function, no conversions apply. If the |
2923 | template-argument represents a set of overloaded | |
2924 | functions, the matching function is selected from the | |
2925 | set (_over.over_). */ | |
75650646 MM |
2926 | tree fns = expr; |
2927 | tree fn; | |
2928 | ||
a05273d4 | 2929 | fn = instantiate_type (type_referred_to, fns, 0); |
e6e174e5 JM |
2930 | |
2931 | if (fn == error_mark_node) | |
2932 | return error_mark_node; | |
75650646 MM |
2933 | |
2934 | if (!TREE_PUBLIC (fn)) | |
2935 | { | |
2936 | if (really_overloaded_fn (fns)) | |
2937 | /* Don't issue an error here; we might get a different | |
2938 | function if the overloading had worked out | |
2939 | differently. */ | |
2940 | return error_mark_node; | |
2941 | else | |
2942 | goto bad_argument; | |
2943 | } | |
2944 | ||
3bfdc719 MM |
2945 | my_friendly_assert (same_type_p (type_referred_to, |
2946 | TREE_TYPE (fn)), | |
75650646 MM |
2947 | 0); |
2948 | ||
2949 | return fn; | |
2950 | } | |
2951 | else | |
2952 | { | |
2953 | /* For a non-type template-parameter of type reference to | |
2954 | object, no conversions apply. The type referred to by the | |
2955 | reference may be more cv-qualified than the (otherwise | |
2956 | identical) type of the template-argument. The | |
2957 | template-parameter is bound directly to the | |
2958 | template-argument, which must be an lvalue. */ | |
ff350acd JM |
2959 | if ((TYPE_MAIN_VARIANT (expr_type) |
2960 | != TYPE_MAIN_VARIANT (type_referred_to)) | |
91063b51 MM |
2961 | || !at_least_as_qualified_p (type_referred_to, |
2962 | expr_type) | |
75650646 MM |
2963 | || !real_lvalue_p (expr)) |
2964 | return error_mark_node; | |
2965 | else | |
2966 | return expr; | |
2967 | } | |
2968 | } | |
2969 | break; | |
2970 | ||
2971 | case RECORD_TYPE: | |
2972 | { | |
410c2fba KL |
2973 | if (!TYPE_PTRMEMFUNC_P (type)) |
2974 | /* This handles templates like | |
2975 | template<class T, T t> void f(); | |
2976 | when T is substituted with any class. The second template | |
2977 | parameter becomes invalid and the template candidate is | |
2978 | rejected. */ | |
2979 | return error_mark_node; | |
75650646 MM |
2980 | |
2981 | /* For a non-type template-parameter of type pointer to member | |
2982 | function, no conversions apply. If the template-argument | |
2983 | represents a set of overloaded member functions, the | |
2984 | matching member function is selected from the set | |
2985 | (_over.over_). */ | |
2986 | ||
2987 | if (!TYPE_PTRMEMFUNC_P (expr_type) && | |
2988 | expr_type != unknown_type_node) | |
2989 | return error_mark_node; | |
2990 | ||
e08a8f45 | 2991 | if (TREE_CODE (expr) == PTRMEM_CST) |
75650646 MM |
2992 | { |
2993 | /* A ptr-to-member constant. */ | |
3bfdc719 | 2994 | if (!same_type_p (type, expr_type)) |
75650646 MM |
2995 | return error_mark_node; |
2996 | else | |
2997 | return expr; | |
2998 | } | |
2999 | ||
3000 | if (TREE_CODE (expr) != ADDR_EXPR) | |
3001 | return error_mark_node; | |
3002 | ||
d8f8dca1 | 3003 | expr = instantiate_type (type, expr, 0); |
75650646 | 3004 | |
d8f8dca1 | 3005 | if (expr == error_mark_node) |
75650646 MM |
3006 | return error_mark_node; |
3007 | ||
3bfdc719 | 3008 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
3009 | 0); |
3010 | return expr; | |
3011 | } | |
3012 | break; | |
3013 | ||
3014 | default: | |
3015 | /* All non-type parameters must have one of these types. */ | |
3016 | my_friendly_abort (0); | |
3017 | break; | |
3018 | } | |
3019 | ||
3020 | return error_mark_node; | |
3021 | } | |
3022 | ||
744fac59 KL |
3023 | /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for |
3024 | template template parameters. Both PARM_PARMS and ARG_PARMS are | |
3025 | vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL | |
3026 | or PARM_DECL. | |
3027 | ||
3028 | ARG_PARMS may contain more parameters than PARM_PARMS. If this is | |
3029 | the case, then extra parameters must have default arguments. | |
3030 | ||
3031 | Consider the example: | |
3032 | template <class T, class Allocator = allocator> class vector; | |
3033 | template<template <class U> class TT> class C; | |
3034 | ||
3035 | C<vector> is a valid instantiation. PARM_PARMS for the above code | |
3036 | contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for | |
3037 | T and Allocator) and OUTER_ARGS contains the argument that is used to | |
3038 | substitute the TT parameter. */ | |
3039 | ||
3040 | static int | |
4393e105 MM |
3041 | coerce_template_template_parms (parm_parms, arg_parms, complain, |
3042 | in_decl, outer_args) | |
3043 | tree parm_parms, arg_parms; | |
3044 | int complain; | |
3045 | tree in_decl, outer_args; | |
744fac59 KL |
3046 | { |
3047 | int nparms, nargs, i; | |
3048 | tree parm, arg; | |
3049 | ||
3050 | my_friendly_assert (TREE_CODE (parm_parms) == TREE_VEC, 0); | |
3051 | my_friendly_assert (TREE_CODE (arg_parms) == TREE_VEC, 0); | |
3052 | ||
3053 | nparms = TREE_VEC_LENGTH (parm_parms); | |
3054 | nargs = TREE_VEC_LENGTH (arg_parms); | |
3055 | ||
3056 | /* The rule here is opposite of coerce_template_parms. */ | |
3057 | if (nargs < nparms | |
3058 | || (nargs > nparms | |
3059 | && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE)) | |
3060 | return 0; | |
3061 | ||
3062 | for (i = 0; i < nparms; ++i) | |
3063 | { | |
3064 | parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i)); | |
3065 | arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i)); | |
3066 | ||
3067 | if (arg == NULL_TREE || arg == error_mark_node | |
3068 | || parm == NULL_TREE || parm == error_mark_node) | |
3069 | return 0; | |
3070 | ||
3071 | if (TREE_CODE (arg) != TREE_CODE (parm)) | |
3072 | return 0; | |
3073 | ||
3074 | switch (TREE_CODE (parm)) | |
3075 | { | |
3076 | case TYPE_DECL: | |
3077 | break; | |
3078 | ||
3079 | case TEMPLATE_DECL: | |
3080 | /* We encounter instantiations of templates like | |
3081 | template <template <template <class> class> class TT> | |
3082 | class C; */ | |
700466c2 JM |
3083 | { |
3084 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
3085 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3086 | ||
3087 | if (!coerce_template_template_parms (parmparm, argparm, | |
4393e105 MM |
3088 | complain, in_decl, |
3089 | outer_args)) | |
700466c2 JM |
3090 | return 0; |
3091 | } | |
3092 | break; | |
744fac59 KL |
3093 | |
3094 | case PARM_DECL: | |
3095 | /* The tsubst call is used to handle cases such as | |
3096 | template <class T, template <T> class TT> class D; | |
3097 | i.e. the parameter list of TT depends on earlier parameters. */ | |
4393e105 MM |
3098 | if (!same_type_p (tsubst (TREE_TYPE (parm), outer_args, |
3099 | complain, in_decl), | |
3bfdc719 | 3100 | TREE_TYPE (arg))) |
744fac59 KL |
3101 | return 0; |
3102 | break; | |
3103 | ||
3104 | default: | |
3105 | my_friendly_abort (0); | |
3106 | } | |
3107 | } | |
3108 | return 1; | |
3109 | } | |
3110 | ||
8b5b8b7c MM |
3111 | /* Convert the indicated template ARG as necessary to match the |
3112 | indicated template PARM. Returns the converted ARG, or | |
3113 | error_mark_node if the conversion was unsuccessful. Error messages | |
3114 | are issued if COMPLAIN is non-zero. This conversion is for the Ith | |
3115 | parameter in the parameter list. ARGS is the full set of template | |
3116 | arguments deduced so far. */ | |
3117 | ||
3118 | static tree | |
3119 | convert_template_argument (parm, arg, args, complain, i, in_decl) | |
3120 | tree parm; | |
3121 | tree arg; | |
3122 | tree args; | |
3123 | int complain; | |
3124 | int i; | |
3125 | tree in_decl; | |
3126 | { | |
3127 | tree val; | |
3128 | tree inner_args; | |
3129 | int is_type, requires_type, is_tmpl_type, requires_tmpl_type; | |
3130 | ||
3131 | inner_args = innermost_args (args); | |
3132 | ||
3133 | if (TREE_CODE (arg) == TREE_LIST | |
3134 | && TREE_TYPE (arg) != NULL_TREE | |
3135 | && TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
3136 | { | |
3137 | /* The template argument was the name of some | |
3138 | member function. That's usually | |
3139 | illegal, but static members are OK. In any | |
3140 | case, grab the underlying fields/functions | |
3141 | and issue an error later if required. */ | |
3142 | arg = TREE_VALUE (arg); | |
3143 | TREE_TYPE (arg) = unknown_type_node; | |
3144 | } | |
3145 | ||
3146 | requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL; | |
3147 | requires_type = (TREE_CODE (parm) == TYPE_DECL | |
3148 | || requires_tmpl_type); | |
3149 | ||
3150 | /* Check if it is a class template. If REQUIRES_TMPL_TYPE is true, | |
3151 | we also accept implicitly created TYPE_DECL as a valid argument. | |
3152 | This is necessary to handle the case where we pass a template name | |
3153 | to a template template parameter in a scope where we've derived from | |
3154 | in instantiation of that template, so the template name refers to that | |
3155 | instantiation. We really ought to handle this better. */ | |
3156 | is_tmpl_type | |
3157 | = ((TREE_CODE (arg) == TEMPLATE_DECL | |
3158 | && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL) | |
3159 | || (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
7ddedda4 | 3160 | && !TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (arg)) |
8b5b8b7c MM |
3161 | || (TREE_CODE (arg) == RECORD_TYPE |
3162 | && CLASSTYPE_TEMPLATE_INFO (arg) | |
3163 | && TREE_CODE (TYPE_NAME (arg)) == TYPE_DECL | |
3164 | && DECL_ARTIFICIAL (TYPE_NAME (arg)) | |
3165 | && requires_tmpl_type | |
b54ccf71 | 3166 | && is_base_of_enclosing_class (arg, current_class_type))); |
8b5b8b7c MM |
3167 | if (is_tmpl_type && TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) |
3168 | arg = TYPE_STUB_DECL (arg); | |
3169 | else if (is_tmpl_type && TREE_CODE (arg) == RECORD_TYPE) | |
3170 | arg = CLASSTYPE_TI_TEMPLATE (arg); | |
3171 | ||
2f939d94 | 3172 | is_type = TYPE_P (arg) || is_tmpl_type; |
8b5b8b7c MM |
3173 | |
3174 | if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF | |
3175 | && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM) | |
3176 | { | |
b4f4233d | 3177 | cp_pedwarn ("to refer to a type member of a template parameter, use `typename %E'", arg); |
8b5b8b7c MM |
3178 | |
3179 | arg = make_typename_type (TREE_OPERAND (arg, 0), | |
3baa501d MM |
3180 | TREE_OPERAND (arg, 1), |
3181 | complain); | |
8b5b8b7c MM |
3182 | is_type = 1; |
3183 | } | |
3184 | if (is_type != requires_type) | |
3185 | { | |
3186 | if (in_decl) | |
3187 | { | |
3188 | if (complain) | |
3189 | { | |
8251199e | 3190 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
3191 | i + 1, in_decl); |
3192 | if (is_type) | |
8251199e | 3193 | cp_error (" expected a constant of type `%T', got `%T'", |
8b5b8b7c MM |
3194 | TREE_TYPE (parm), |
3195 | (is_tmpl_type ? DECL_NAME (arg) : arg)); | |
3196 | else | |
8251199e | 3197 | cp_error (" expected a type, got `%E'", arg); |
8b5b8b7c MM |
3198 | } |
3199 | } | |
3200 | return error_mark_node; | |
3201 | } | |
3202 | if (is_tmpl_type ^ requires_tmpl_type) | |
3203 | { | |
3204 | if (in_decl && complain) | |
3205 | { | |
8251199e | 3206 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
3207 | i + 1, in_decl); |
3208 | if (is_tmpl_type) | |
8251199e | 3209 | cp_error (" expected a type, got `%T'", DECL_NAME (arg)); |
8b5b8b7c | 3210 | else |
8251199e | 3211 | cp_error (" expected a class template, got `%T'", arg); |
8b5b8b7c MM |
3212 | } |
3213 | return error_mark_node; | |
3214 | } | |
3215 | ||
3216 | if (is_type) | |
3217 | { | |
3218 | if (requires_tmpl_type) | |
3219 | { | |
3220 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
3221 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
3222 | ||
4393e105 | 3223 | if (coerce_template_template_parms (parmparm, argparm, complain, |
8b5b8b7c MM |
3224 | in_decl, inner_args)) |
3225 | { | |
3226 | val = arg; | |
3227 | ||
3228 | /* TEMPLATE_TEMPLATE_PARM node is preferred over | |
3229 | TEMPLATE_DECL. */ | |
3230 | if (val != error_mark_node | |
3231 | && DECL_TEMPLATE_TEMPLATE_PARM_P (val)) | |
3232 | val = TREE_TYPE (val); | |
3233 | } | |
3234 | else | |
3235 | { | |
3236 | if (in_decl && complain) | |
3237 | { | |
8251199e | 3238 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c | 3239 | i + 1, in_decl); |
8251199e | 3240 | cp_error (" expected a template of type `%D', got `%D'", parm, arg); |
8b5b8b7c MM |
3241 | } |
3242 | ||
3243 | val = error_mark_node; | |
3244 | } | |
3245 | } | |
3246 | else | |
3247 | { | |
3248 | val = groktypename (arg); | |
3249 | if (! processing_template_decl) | |
3250 | { | |
3251 | /* [basic.link]: A name with no linkage (notably, the | |
3252 | name of a class or enumeration declared in a local | |
3253 | scope) shall not be used to declare an entity with | |
3254 | linkage. This implies that names with no linkage | |
3255 | cannot be used as template arguments. */ | |
3256 | tree t = no_linkage_check (val); | |
3257 | if (t) | |
3258 | { | |
3259 | if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t))) | |
8251199e JM |
3260 | cp_pedwarn |
3261 | ("template-argument `%T' uses anonymous type", val); | |
8b5b8b7c | 3262 | else |
8251199e JM |
3263 | cp_error |
3264 | ("template-argument `%T' uses local type `%T'", | |
8b5b8b7c MM |
3265 | val, t); |
3266 | return error_mark_node; | |
3267 | } | |
3268 | } | |
3269 | } | |
3270 | } | |
3271 | else | |
3272 | { | |
4393e105 | 3273 | tree t = tsubst (TREE_TYPE (parm), args, complain, in_decl); |
8b5b8b7c MM |
3274 | |
3275 | if (processing_template_decl) | |
3276 | arg = maybe_fold_nontype_arg (arg); | |
3277 | ||
3278 | if (!uses_template_parms (arg) && !uses_template_parms (t)) | |
3279 | /* We used to call digest_init here. However, digest_init | |
3280 | will report errors, which we don't want when complain | |
3281 | is zero. More importantly, digest_init will try too | |
3282 | hard to convert things: for example, `0' should not be | |
3283 | converted to pointer type at this point according to | |
3284 | the standard. Accepting this is not merely an | |
3285 | extension, since deciding whether or not these | |
3286 | conversions can occur is part of determining which | |
3287 | function template to call, or whether a given epxlicit | |
3288 | argument specification is legal. */ | |
3289 | val = convert_nontype_argument (t, arg); | |
3290 | else | |
3291 | val = arg; | |
3292 | ||
3293 | if (val == NULL_TREE) | |
3294 | val = error_mark_node; | |
3295 | else if (val == error_mark_node && complain) | |
8251199e | 3296 | cp_error ("could not convert template argument `%E' to `%T'", |
8b5b8b7c MM |
3297 | arg, t); |
3298 | } | |
3299 | ||
3300 | return val; | |
3301 | } | |
3302 | ||
3303 | /* Convert all template arguments to their appropriate types, and | |
3304 | return a vector containing the innermost resulting template | |
3305 | arguments. If any error occurs, return error_mark_node, and, if | |
3306 | COMPLAIN is non-zero, issue an error message. Some error messages | |
3307 | are issued even if COMPLAIN is zero; for instance, if a template | |
3308 | argument is composed from a local class. | |
75650646 MM |
3309 | |
3310 | If REQUIRE_ALL_ARGUMENTS is non-zero, all arguments must be | |
3311 | provided in ARGLIST, or else trailing parameters must have default | |
3312 | values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument | |
6dfbb909 | 3313 | deduction for any unspecified trailing arguments. */ |
de575009 | 3314 | |
8d08fdba | 3315 | static tree |
8b5b8b7c | 3316 | coerce_template_parms (parms, args, in_decl, |
75650646 | 3317 | complain, |
744fac59 | 3318 | require_all_arguments) |
8b5b8b7c | 3319 | tree parms, args; |
8d08fdba | 3320 | tree in_decl; |
75650646 MM |
3321 | int complain; |
3322 | int require_all_arguments; | |
8d08fdba | 3323 | { |
a292b002 | 3324 | int nparms, nargs, i, lost = 0; |
e4a84209 | 3325 | tree inner_args; |
8b5b8b7c MM |
3326 | tree new_args; |
3327 | tree new_inner_args; | |
a292b002 | 3328 | |
8b5b8b7c | 3329 | inner_args = innermost_args (args); |
e4a84209 | 3330 | nargs = NUM_TMPL_ARGS (inner_args); |
a292b002 MS |
3331 | nparms = TREE_VEC_LENGTH (parms); |
3332 | ||
3333 | if (nargs > nparms | |
3334 | || (nargs < nparms | |
75650646 | 3335 | && require_all_arguments |
a292b002 | 3336 | && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE)) |
8d08fdba | 3337 | { |
75650646 MM |
3338 | if (complain) |
3339 | { | |
8251199e | 3340 | cp_error ("wrong number of template arguments (%d, should be %d)", |
e4a84209 | 3341 | nargs, nparms); |
75650646 MM |
3342 | |
3343 | if (in_decl) | |
8251199e | 3344 | cp_error_at ("provided for `%D'", in_decl); |
75650646 MM |
3345 | } |
3346 | ||
8d08fdba MS |
3347 | return error_mark_node; |
3348 | } | |
3349 | ||
f31c0a32 | 3350 | new_inner_args = make_tree_vec (nparms); |
8b5b8b7c MM |
3351 | new_args = add_outermost_template_args (args, new_inner_args); |
3352 | for (i = 0; i < nparms; i++) | |
8d08fdba | 3353 | { |
8b5b8b7c MM |
3354 | tree arg; |
3355 | tree parm; | |
e4a84209 | 3356 | |
8b5b8b7c MM |
3357 | /* Get the Ith template parameter. */ |
3358 | parm = TREE_VEC_ELT (parms, i); | |
75650646 | 3359 | |
8b5b8b7c MM |
3360 | /* Calculate the Ith argument. */ |
3361 | if (inner_args && TREE_CODE (inner_args) == TREE_LIST) | |
8d08fdba | 3362 | { |
8b5b8b7c MM |
3363 | arg = TREE_VALUE (inner_args); |
3364 | inner_args = TREE_CHAIN (inner_args); | |
8d08fdba | 3365 | } |
8b5b8b7c MM |
3366 | else if (i < nargs) |
3367 | arg = TREE_VEC_ELT (inner_args, i); | |
3368 | /* If no template argument was supplied, look for a default | |
3369 | value. */ | |
3370 | else if (TREE_PURPOSE (parm) == NULL_TREE) | |
3371 | { | |
3372 | /* There was no default value. */ | |
3373 | my_friendly_assert (!require_all_arguments, 0); | |
3374 | break; | |
3375 | } | |
3376 | else if (TREE_CODE (TREE_VALUE (parm)) == TYPE_DECL) | |
4393e105 | 3377 | arg = tsubst (TREE_PURPOSE (parm), new_args, complain, in_decl); |
8b5b8b7c | 3378 | else |
4393e105 MM |
3379 | arg = tsubst_expr (TREE_PURPOSE (parm), new_args, complain, |
3380 | in_decl); | |
e4a84209 | 3381 | |
8b5b8b7c | 3382 | /* Now, convert the Ith argument, as necessary. */ |
75650646 MM |
3383 | if (arg == NULL_TREE) |
3384 | /* We're out of arguments. */ | |
3385 | { | |
3386 | my_friendly_assert (!require_all_arguments, 0); | |
3387 | break; | |
3388 | } | |
8b5b8b7c | 3389 | else if (arg == error_mark_node) |
75650646 | 3390 | { |
8251199e | 3391 | cp_error ("template argument %d is invalid", i + 1); |
8b5b8b7c | 3392 | arg = error_mark_node; |
8d08fdba | 3393 | } |
8b5b8b7c MM |
3394 | else |
3395 | arg = convert_template_argument (TREE_VALUE (parm), | |
3396 | arg, new_args, complain, i, | |
3397 | in_decl); | |
3398 | ||
3399 | if (arg == error_mark_node) | |
8d08fdba | 3400 | lost++; |
8b5b8b7c | 3401 | TREE_VEC_ELT (new_inner_args, i) = arg; |
8d08fdba | 3402 | } |
8b5b8b7c | 3403 | |
8d08fdba MS |
3404 | if (lost) |
3405 | return error_mark_node; | |
8b5b8b7c MM |
3406 | |
3407 | return new_inner_args; | |
8d08fdba MS |
3408 | } |
3409 | ||
34016c81 JM |
3410 | /* Returns 1 if template args OT and NT are equivalent. */ |
3411 | ||
d8e178a0 | 3412 | static int |
34016c81 JM |
3413 | template_args_equal (ot, nt) |
3414 | tree ot, nt; | |
3415 | { | |
3416 | if (nt == ot) | |
3417 | return 1; | |
3418 | if (TREE_CODE (nt) != TREE_CODE (ot)) | |
3419 | return 0; | |
3420 | if (TREE_CODE (nt) == TREE_VEC) | |
3421 | /* For member templates */ | |
3422 | return comp_template_args (ot, nt); | |
2f939d94 | 3423 | else if (TYPE_P (ot)) |
3bfdc719 | 3424 | return same_type_p (ot, nt); |
34016c81 JM |
3425 | else |
3426 | return (cp_tree_equal (ot, nt) > 0); | |
3427 | } | |
3428 | ||
3429 | /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets | |
f84b4be9 JM |
3430 | of template arguments. Returns 0 otherwise. */ |
3431 | ||
6757edfe | 3432 | int |
5566b478 MS |
3433 | comp_template_args (oldargs, newargs) |
3434 | tree oldargs, newargs; | |
3435 | { | |
3436 | int i; | |
3437 | ||
386b8a85 JM |
3438 | if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs)) |
3439 | return 0; | |
3440 | ||
5566b478 MS |
3441 | for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i) |
3442 | { | |
3443 | tree nt = TREE_VEC_ELT (newargs, i); | |
3444 | tree ot = TREE_VEC_ELT (oldargs, i); | |
3445 | ||
34016c81 | 3446 | if (! template_args_equal (ot, nt)) |
61a127b3 | 3447 | return 0; |
5566b478 MS |
3448 | } |
3449 | return 1; | |
3450 | } | |
3451 | ||
8d08fdba MS |
3452 | /* Given class template name and parameter list, produce a user-friendly name |
3453 | for the instantiation. */ | |
e92cc029 | 3454 | |
8d08fdba | 3455 | static char * |
36a117a5 | 3456 | mangle_class_name_for_template (name, parms, arglist) |
8d08fdba MS |
3457 | char *name; |
3458 | tree parms, arglist; | |
3459 | { | |
3460 | static struct obstack scratch_obstack; | |
3461 | static char *scratch_firstobj; | |
3462 | int i, nparms; | |
8d08fdba MS |
3463 | |
3464 | if (!scratch_firstobj) | |
fc378698 | 3465 | gcc_obstack_init (&scratch_obstack); |
8d08fdba MS |
3466 | else |
3467 | obstack_free (&scratch_obstack, scratch_firstobj); | |
fc378698 | 3468 | scratch_firstobj = obstack_alloc (&scratch_obstack, 1); |
8d08fdba | 3469 | |
8d08fdba | 3470 | #define ccat(c) obstack_1grow (&scratch_obstack, (c)); |
8d08fdba | 3471 | #define cat(s) obstack_grow (&scratch_obstack, (s), strlen (s)) |
8d08fdba MS |
3472 | |
3473 | cat (name); | |
3474 | ccat ('<'); | |
3475 | nparms = TREE_VEC_LENGTH (parms); | |
36a117a5 | 3476 | arglist = innermost_args (arglist); |
8d08fdba MS |
3477 | my_friendly_assert (nparms == TREE_VEC_LENGTH (arglist), 268); |
3478 | for (i = 0; i < nparms; i++) | |
3479 | { | |
a292b002 MS |
3480 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
3481 | tree arg = TREE_VEC_ELT (arglist, i); | |
8d08fdba MS |
3482 | |
3483 | if (i) | |
3484 | ccat (','); | |
3485 | ||
a292b002 | 3486 | if (TREE_CODE (parm) == TYPE_DECL) |
8d08fdba | 3487 | { |
9e93bc9d | 3488 | cat (type_as_string (arg, TS_CHASE_TYPEDEFS)); |
8d08fdba MS |
3489 | continue; |
3490 | } | |
73b0fce8 KL |
3491 | else if (TREE_CODE (parm) == TEMPLATE_DECL) |
3492 | { | |
3493 | if (TREE_CODE (arg) == TEMPLATE_DECL) | |
2c73f9f5 ML |
3494 | { |
3495 | /* Already substituted with real template. Just output | |
3496 | the template name here */ | |
cb0dbb9a | 3497 | tree context = DECL_CONTEXT (arg); |
ec4f972f AS |
3498 | if (context) |
3499 | { | |
3500 | /* The template may be defined in a namespace, or | |
3501 | may be a member template. */ | |
3502 | my_friendly_assert (TREE_CODE (context) == NAMESPACE_DECL | |
3503 | || CLASS_TYPE_P (context), | |
3504 | 980422); | |
2c73f9f5 ML |
3505 | cat(decl_as_string (DECL_CONTEXT (arg), 0)); |
3506 | cat("::"); | |
3507 | } | |
3508 | cat (IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3509 | } | |
73b0fce8 KL |
3510 | else |
3511 | /* Output the parameter declaration */ | |
9e93bc9d | 3512 | cat (type_as_string (arg, TS_CHASE_TYPEDEFS)); |
73b0fce8 KL |
3513 | continue; |
3514 | } | |
8d08fdba MS |
3515 | else |
3516 | my_friendly_assert (TREE_CODE (parm) == PARM_DECL, 269); | |
3517 | ||
3518 | if (TREE_CODE (arg) == TREE_LIST) | |
3519 | { | |
3520 | /* New list cell was built because old chain link was in | |
3521 | use. */ | |
3522 | my_friendly_assert (TREE_PURPOSE (arg) == NULL_TREE, 270); | |
3523 | arg = TREE_VALUE (arg); | |
3524 | } | |
3525 | /* No need to check arglist against parmlist here; we did that | |
3526 | in coerce_template_parms, called from lookup_template_class. */ | |
3527 | cat (expr_as_string (arg, 0)); | |
3528 | } | |
3529 | { | |
3530 | char *bufp = obstack_next_free (&scratch_obstack); | |
3531 | int offset = 0; | |
3532 | while (bufp[offset - 1] == ' ') | |
3533 | offset--; | |
3534 | obstack_blank_fast (&scratch_obstack, offset); | |
3535 | ||
3536 | /* B<C<char> >, not B<C<char>> */ | |
3537 | if (bufp[offset - 1] == '>') | |
3538 | ccat (' '); | |
3539 | } | |
3540 | ccat ('>'); | |
3541 | ccat ('\0'); | |
3542 | return (char *) obstack_base (&scratch_obstack); | |
8d08fdba MS |
3543 | } |
3544 | ||
bd6dd845 | 3545 | static tree |
5566b478 MS |
3546 | classtype_mangled_name (t) |
3547 | tree t; | |
3548 | { | |
3549 | if (CLASSTYPE_TEMPLATE_INFO (t) | |
36a117a5 MM |
3550 | /* Specializations have already had their names set up in |
3551 | lookup_template_class. */ | |
370af2d5 | 3552 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
9fbf56f7 MM |
3553 | { |
3554 | tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t)); | |
3555 | ||
36a117a5 MM |
3556 | /* For non-primary templates, the template parameters are |
3557 | implicit from their surrounding context. */ | |
9fbf56f7 MM |
3558 | if (PRIMARY_TEMPLATE_P (tmpl)) |
3559 | { | |
3560 | tree name = DECL_NAME (tmpl); | |
3561 | char *mangled_name = mangle_class_name_for_template | |
3562 | (IDENTIFIER_POINTER (name), | |
3563 | DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
3564 | CLASSTYPE_TI_ARGS (t)); | |
3565 | tree id = get_identifier (mangled_name); | |
3566 | IDENTIFIER_TEMPLATE (id) = name; | |
3567 | return id; | |
3568 | } | |
5566b478 | 3569 | } |
9fbf56f7 MM |
3570 | |
3571 | return TYPE_IDENTIFIER (t); | |
5566b478 MS |
3572 | } |
3573 | ||
3574 | static void | |
3575 | add_pending_template (d) | |
3576 | tree d; | |
3577 | { | |
2f939d94 | 3578 | tree ti = (TYPE_P (d)) ? CLASSTYPE_TEMPLATE_INFO (d) : DECL_TEMPLATE_INFO (d); |
e92cc029 | 3579 | |
824b9a4c | 3580 | if (TI_PENDING_TEMPLATE_FLAG (ti)) |
5566b478 MS |
3581 | return; |
3582 | ||
e1b3e07d | 3583 | *template_tail = tree_cons (build_srcloc_here (), d, NULL_TREE); |
5566b478 | 3584 | template_tail = &TREE_CHAIN (*template_tail); |
824b9a4c | 3585 | TI_PENDING_TEMPLATE_FLAG (ti) = 1; |
5566b478 MS |
3586 | } |
3587 | ||
386b8a85 JM |
3588 | |
3589 | /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS (which | |
3590 | may be either a _DECL or an overloaded function or an | |
3591 | IDENTIFIER_NODE), and ARGLIST. */ | |
3592 | ||
3593 | tree | |
3594 | lookup_template_function (fns, arglist) | |
3595 | tree fns, arglist; | |
3596 | { | |
2c73f9f5 | 3597 | tree type; |
050367a3 | 3598 | |
386b8a85 JM |
3599 | if (fns == NULL_TREE) |
3600 | { | |
8251199e | 3601 | cp_error ("non-template used as template"); |
386b8a85 JM |
3602 | return error_mark_node; |
3603 | } | |
3604 | ||
2c73f9f5 ML |
3605 | type = TREE_TYPE (fns); |
3606 | if (TREE_CODE (fns) == OVERLOAD || !type) | |
3607 | type = unknown_type_node; | |
3608 | ||
672476cb MM |
3609 | if (processing_template_decl) |
3610 | return build_min (TEMPLATE_ID_EXPR, type, fns, arglist); | |
3611 | else | |
3612 | return build (TEMPLATE_ID_EXPR, type, fns, arglist); | |
386b8a85 JM |
3613 | } |
3614 | ||
a2b60a0e MM |
3615 | /* Within the scope of a template class S<T>, the name S gets bound |
3616 | (in build_self_reference) to a TYPE_DECL for the class, not a | |
3617 | TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type, | |
3618 | or one of its enclosing classes, and that type is a template, | |
3619 | return the associated TEMPLATE_DECL. Otherwise, the original | |
3620 | DECL is returned. */ | |
3621 | ||
e9659ab0 | 3622 | static tree |
a2b60a0e MM |
3623 | maybe_get_template_decl_from_type_decl (decl) |
3624 | tree decl; | |
3625 | { | |
3626 | return (decl != NULL_TREE | |
3627 | && TREE_CODE (decl) == TYPE_DECL | |
3628 | && DECL_ARTIFICIAL (decl) | |
511b60ff | 3629 | && CLASS_TYPE_P (TREE_TYPE (decl)) |
a2b60a0e MM |
3630 | && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl))) |
3631 | ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl; | |
3632 | } | |
386b8a85 | 3633 | |
8d08fdba MS |
3634 | /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of |
3635 | parameters, find the desired type. | |
3636 | ||
3637 | D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments. | |
36a117a5 MM |
3638 | (Actually ARGLIST may be either a TREE_LIST or a TREE_VEC. It will |
3639 | be a TREE_LIST if called directly from the parser, and a TREE_VEC | |
0a2c2fd1 | 3640 | otherwise.) Since ARGLIST is build on the temp_decl_obstack, we must |
36a117a5 MM |
3641 | copy it here to keep it from being reclaimed when the decl storage |
3642 | is reclaimed. | |
8d08fdba MS |
3643 | |
3644 | IN_DECL, if non-NULL, is the template declaration we are trying to | |
75650646 MM |
3645 | instantiate. |
3646 | ||
36a117a5 MM |
3647 | If ENTERING_SCOPE is non-zero, we are about to enter the scope of |
3648 | the class we are looking up. | |
3649 | ||
75650646 MM |
3650 | If the template class is really a local class in a template |
3651 | function, then the FUNCTION_CONTEXT is the function in which it is | |
3652 | being instantiated. */ | |
e92cc029 | 3653 | |
8d08fdba | 3654 | tree |
36a117a5 | 3655 | lookup_template_class (d1, arglist, in_decl, context, entering_scope) |
8d08fdba MS |
3656 | tree d1, arglist; |
3657 | tree in_decl; | |
e1467ff2 | 3658 | tree context; |
36a117a5 | 3659 | int entering_scope; |
8d08fdba | 3660 | { |
a703fb38 | 3661 | tree template = NULL_TREE, parmlist; |
dbfe2124 | 3662 | tree t; |
5566b478 MS |
3663 | |
3664 | if (TREE_CODE (d1) == IDENTIFIER_NODE) | |
3665 | { | |
f181d4ae MM |
3666 | if (IDENTIFIER_VALUE (d1) |
3667 | && DECL_TEMPLATE_TEMPLATE_PARM_P (IDENTIFIER_VALUE (d1))) | |
3668 | template = IDENTIFIER_VALUE (d1); | |
73b0fce8 KL |
3669 | else |
3670 | { | |
2c73f9f5 ML |
3671 | if (context) |
3672 | push_decl_namespace (context); | |
3ebc5c52 MM |
3673 | template = lookup_name (d1, /*prefer_type=*/0); |
3674 | template = maybe_get_template_decl_from_type_decl (template); | |
2c73f9f5 ML |
3675 | if (context) |
3676 | pop_decl_namespace (); | |
73b0fce8 | 3677 | } |
8d019cef JM |
3678 | if (template) |
3679 | context = DECL_CONTEXT (template); | |
5566b478 | 3680 | } |
c91a56d2 MS |
3681 | else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1))) |
3682 | { | |
802dbc34 JM |
3683 | tree type = TREE_TYPE (d1); |
3684 | ||
3685 | /* If we are declaring a constructor, say A<T>::A<T>, we will get | |
3686 | an implicit typename for the second A. Deal with it. */ | |
3687 | if (TREE_CODE (type) == TYPENAME_TYPE && TREE_TYPE (type)) | |
3688 | type = TREE_TYPE (type); | |
3689 | ||
3690 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
f3400fe2 | 3691 | { |
802dbc34 | 3692 | template = CLASSTYPE_TI_TEMPLATE (type); |
f3400fe2 JM |
3693 | d1 = DECL_NAME (template); |
3694 | } | |
c91a56d2 | 3695 | } |
ed44da02 | 3696 | else if (TREE_CODE (d1) == ENUMERAL_TYPE |
2f939d94 | 3697 | || (TYPE_P (d1) && IS_AGGR_TYPE (d1))) |
5566b478 | 3698 | { |
ed44da02 | 3699 | template = TYPE_TI_TEMPLATE (d1); |
5566b478 MS |
3700 | d1 = DECL_NAME (template); |
3701 | } | |
93cdc044 | 3702 | else if (TREE_CODE (d1) == TEMPLATE_DECL |
17aec3eb | 3703 | && TREE_CODE (DECL_TEMPLATE_RESULT (d1)) == TYPE_DECL) |
93cdc044 JM |
3704 | { |
3705 | template = d1; | |
3706 | d1 = DECL_NAME (template); | |
3707 | context = DECL_CONTEXT (template); | |
3708 | } | |
5566b478 MS |
3709 | else |
3710 | my_friendly_abort (272); | |
8d08fdba | 3711 | |
8d08fdba | 3712 | /* With something like `template <class T> class X class X { ... };' |
f181d4ae MM |
3713 | we could end up with D1 having nothing but an IDENTIFIER_VALUE. |
3714 | We don't want to do that, but we have to deal with the situation, | |
3715 | so let's give them some syntax errors to chew on instead of a | |
3716 | crash. */ | |
8d08fdba | 3717 | if (! template) |
f3400fe2 JM |
3718 | { |
3719 | cp_error ("`%T' is not a template", d1); | |
3720 | return error_mark_node; | |
3721 | } | |
2c73f9f5 | 3722 | |
c3baf4b5 JM |
3723 | if (context == NULL_TREE) |
3724 | context = global_namespace; | |
2c73f9f5 | 3725 | |
8d08fdba MS |
3726 | if (TREE_CODE (template) != TEMPLATE_DECL) |
3727 | { | |
8251199e | 3728 | cp_error ("non-template type `%T' used as a template", d1); |
8d08fdba | 3729 | if (in_decl) |
8251199e | 3730 | cp_error_at ("for template declaration `%D'", in_decl); |
8d08fdba MS |
3731 | return error_mark_node; |
3732 | } | |
8d08fdba | 3733 | |
73b0fce8 KL |
3734 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (template)) |
3735 | { | |
3736 | /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store | |
3737 | template arguments */ | |
3738 | ||
3739 | tree parm = copy_template_template_parm (TREE_TYPE (template)); | |
3740 | tree template2 = TYPE_STUB_DECL (parm); | |
3741 | tree arglist2; | |
3742 | ||
73b0fce8 KL |
3743 | parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template); |
3744 | ||
744fac59 | 3745 | arglist2 = coerce_template_parms (parmlist, arglist, template, 1, 1); |
73b0fce8 KL |
3746 | if (arglist2 == error_mark_node) |
3747 | return error_mark_node; | |
3748 | ||
7ddedda4 | 3749 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm) |
e1b3e07d | 3750 | = tree_cons (template2, arglist2, NULL_TREE); |
73b0fce8 KL |
3751 | TYPE_SIZE (parm) = 0; |
3752 | return parm; | |
3753 | } | |
36a117a5 | 3754 | else |
8d08fdba | 3755 | { |
36a117a5 | 3756 | tree template_type = TREE_TYPE (template); |
7ac7b28f | 3757 | tree gen_tmpl; |
36a117a5 MM |
3758 | tree type_decl; |
3759 | tree found = NULL_TREE; | |
3760 | int arg_depth; | |
3761 | int parm_depth; | |
dbfe2124 | 3762 | int is_partial_instantiation; |
830bfa74 | 3763 | |
7ac7b28f MM |
3764 | gen_tmpl = most_general_template (template); |
3765 | parmlist = DECL_TEMPLATE_PARMS (gen_tmpl); | |
36a117a5 MM |
3766 | parm_depth = TMPL_PARMS_DEPTH (parmlist); |
3767 | arg_depth = TMPL_ARGS_DEPTH (arglist); | |
3768 | ||
3769 | if (arg_depth == 1 && parm_depth > 1) | |
3770 | { | |
39c01e4c | 3771 | /* We've been given an incomplete set of template arguments. |
36a117a5 MM |
3772 | For example, given: |
3773 | ||
3774 | template <class T> struct S1 { | |
3775 | template <class U> struct S2 {}; | |
3776 | template <class U> struct S2<U*> {}; | |
3777 | }; | |
3778 | ||
3779 | we will be called with an ARGLIST of `U*', but the | |
3780 | TEMPLATE will be `template <class T> template | |
3781 | <class U> struct S1<T>::S2'. We must fill in the missing | |
3782 | arguments. */ | |
7ac7b28f MM |
3783 | arglist |
3784 | = add_outermost_template_args (TYPE_TI_ARGS (TREE_TYPE (template)), | |
3785 | arglist); | |
36a117a5 MM |
3786 | arg_depth = TMPL_ARGS_DEPTH (arglist); |
3787 | } | |
5566b478 | 3788 | |
7ac7b28f | 3789 | /* Now we should enough arguments. */ |
36a117a5 MM |
3790 | my_friendly_assert (parm_depth == arg_depth, 0); |
3791 | ||
7ac7b28f MM |
3792 | /* From here on, we're only interested in the most general |
3793 | template. */ | |
3794 | template = gen_tmpl; | |
3795 | ||
36a117a5 MM |
3796 | /* Calculate the BOUND_ARGS. These will be the args that are |
3797 | actually tsubst'd into the definition to create the | |
3798 | instantiation. */ | |
3799 | if (parm_depth > 1) | |
830bfa74 MM |
3800 | { |
3801 | /* We have multiple levels of arguments to coerce, at once. */ | |
830bfa74 | 3802 | int i; |
e4a84209 | 3803 | int saved_depth = TMPL_ARGS_DEPTH (arglist); |
36a117a5 | 3804 | |
f31c0a32 | 3805 | tree bound_args = make_tree_vec (parm_depth); |
830bfa74 | 3806 | |
e4a84209 | 3807 | for (i = saved_depth, |
830bfa74 | 3808 | t = DECL_TEMPLATE_PARMS (template); |
e4a84209 | 3809 | i > 0 && t != NULL_TREE; |
830bfa74 | 3810 | --i, t = TREE_CHAIN (t)) |
e4a84209 MM |
3811 | { |
3812 | tree a = coerce_template_parms (TREE_VALUE (t), | |
3813 | arglist, template, 1, 1); | |
3814 | SET_TMPL_ARGS_LEVEL (bound_args, i, a); | |
3815 | ||
3816 | /* We temporarily reduce the length of the ARGLIST so | |
3817 | that coerce_template_parms will see only the arguments | |
3818 | corresponding to the template parameters it is | |
3819 | examining. */ | |
3820 | TREE_VEC_LENGTH (arglist)--; | |
3821 | } | |
3822 | ||
3823 | /* Restore the ARGLIST to its full size. */ | |
3824 | TREE_VEC_LENGTH (arglist) = saved_depth; | |
3825 | ||
36a117a5 | 3826 | arglist = bound_args; |
830bfa74 MM |
3827 | } |
3828 | else | |
36a117a5 MM |
3829 | arglist |
3830 | = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist), | |
3831 | innermost_args (arglist), | |
3832 | template, 1, 1); | |
3833 | ||
3834 | if (arglist == error_mark_node) | |
3835 | /* We were unable to bind the arguments. */ | |
5566b478 | 3836 | return error_mark_node; |
5566b478 | 3837 | |
36a117a5 MM |
3838 | /* In the scope of a template class, explicit references to the |
3839 | template class refer to the type of the template, not any | |
3840 | instantiation of it. For example, in: | |
3841 | ||
3842 | template <class T> class C { void f(C<T>); } | |
3843 | ||
3844 | the `C<T>' is just the same as `C'. Outside of the | |
3845 | class, however, such a reference is an instantiation. */ | |
ed44da02 | 3846 | if (comp_template_args (TYPE_TI_ARGS (template_type), |
36a117a5 MM |
3847 | arglist)) |
3848 | { | |
3849 | found = template_type; | |
3850 | ||
3851 | if (!entering_scope && PRIMARY_TEMPLATE_P (template)) | |
5566b478 | 3852 | { |
36a117a5 MM |
3853 | tree ctx; |
3854 | ||
3855 | /* Note that we use DECL_CONTEXT, rather than | |
3856 | CP_DECL_CONTEXT, so that the termination test is | |
3857 | always just `ctx'. We're not interested in namepace | |
3858 | scopes. */ | |
3859 | for (ctx = current_class_type; | |
3860 | ctx; | |
2f939d94 | 3861 | ctx = (TYPE_P (ctx)) ? TYPE_CONTEXT (ctx) : DECL_CONTEXT (ctx)) |
3bfdc719 | 3862 | if (same_type_p (ctx, template_type)) |
36a117a5 MM |
3863 | break; |
3864 | ||
3865 | if (!ctx) | |
3866 | /* We're not in the scope of the class, so the | |
3867 | TEMPLATE_TYPE is not the type we want after | |
3868 | all. */ | |
3869 | found = NULL_TREE; | |
5566b478 MS |
3870 | } |
3871 | } | |
36a117a5 MM |
3872 | |
3873 | if (!found) | |
75650646 | 3874 | { |
36a117a5 MM |
3875 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); |
3876 | found; found = TREE_CHAIN (found)) | |
3877 | if (comp_template_args (TREE_PURPOSE (found), arglist)) | |
3878 | break; | |
75650646 | 3879 | |
36a117a5 MM |
3880 | if (found) |
3881 | found = TREE_VALUE (found); | |
8d08fdba | 3882 | } |
3ebc5c52 | 3883 | |
36a117a5 | 3884 | if (found) |
f31c0a32 | 3885 | return found; |
5566b478 | 3886 | |
dbfe2124 | 3887 | /* This type is a "partial instantiation" if any of the template |
486e4077 MM |
3888 | arguments still inolve template parameters. Note that we set |
3889 | IS_PARTIAL_INSTANTIATION for partial specializations as | |
3890 | well. */ | |
dbfe2124 MM |
3891 | is_partial_instantiation = uses_template_parms (arglist); |
3892 | ||
3ebc5c52 MM |
3893 | if (!is_partial_instantiation |
3894 | && !PRIMARY_TEMPLATE_P (template) | |
3895 | && TREE_CODE (CP_DECL_CONTEXT (template)) == NAMESPACE_DECL) | |
3896 | { | |
3ebc5c52 MM |
3897 | found = xref_tag_from_type (TREE_TYPE (template), |
3898 | DECL_NAME (template), | |
3899 | /*globalize=*/1); | |
3900 | return found; | |
3901 | } | |
3ebc5c52 | 3902 | |
36a117a5 | 3903 | /* Create the type. */ |
ed44da02 MM |
3904 | if (TREE_CODE (template_type) == ENUMERAL_TYPE) |
3905 | { | |
dbfe2124 | 3906 | if (!is_partial_instantiation) |
61a127b3 | 3907 | t = start_enum (TYPE_IDENTIFIER (template_type)); |
ed44da02 | 3908 | else |
dbfe2124 | 3909 | /* We don't want to call start_enum for this type, since |
ed44da02 MM |
3910 | the values for the enumeration constants may involve |
3911 | template parameters. And, no one should be interested | |
3912 | in the enumeration constants for such a type. */ | |
3913 | t = make_node (ENUMERAL_TYPE); | |
3914 | } | |
3915 | else | |
3916 | { | |
33848bb0 | 3917 | t = make_aggr_type (TREE_CODE (template_type)); |
ed44da02 MM |
3918 | CLASSTYPE_DECLARED_CLASS (t) |
3919 | = CLASSTYPE_DECLARED_CLASS (template_type); | |
3920 | CLASSTYPE_GOT_SEMICOLON (t) = 1; | |
3921 | SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t); | |
f668f160 | 3922 | TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type); |
ae673f14 JM |
3923 | |
3924 | /* A local class. Make sure the decl gets registered properly. */ | |
3925 | if (context == current_function_decl) | |
3926 | pushtag (DECL_NAME (template), t, 0); | |
ed44da02 MM |
3927 | } |
3928 | ||
ae673f14 JM |
3929 | /* If we called start_enum or pushtag above, this information |
3930 | will already be set up. */ | |
ed44da02 MM |
3931 | if (!TYPE_NAME (t)) |
3932 | { | |
3933 | TYPE_CONTEXT (t) = FROB_CONTEXT (context); | |
36a117a5 | 3934 | |
9188c363 | 3935 | type_decl = create_implicit_typedef (DECL_NAME (template), t); |
ed44da02 | 3936 | DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t); |
9188c363 | 3937 | TYPE_STUB_DECL (t) = type_decl; |
ed44da02 MM |
3938 | DECL_SOURCE_FILE (type_decl) |
3939 | = DECL_SOURCE_FILE (TYPE_STUB_DECL (template_type)); | |
3940 | DECL_SOURCE_LINE (type_decl) | |
3941 | = DECL_SOURCE_LINE (TYPE_STUB_DECL (template_type)); | |
ed44da02 MM |
3942 | } |
3943 | else | |
3944 | type_decl = TYPE_NAME (t); | |
36a117a5 | 3945 | |
9fbf56f7 MM |
3946 | /* Set up the template information. We have to figure out which |
3947 | template is the immediate parent if this is a full | |
3948 | instantiation. */ | |
3949 | if (parm_depth == 1 || is_partial_instantiation | |
3950 | || !PRIMARY_TEMPLATE_P (template)) | |
3951 | /* This case is easy; there are no member templates involved. */ | |
3952 | found = template; | |
3953 | else | |
3954 | { | |
3955 | /* This is a full instantiation of a member template. There | |
3956 | should be some partial instantiation of which this is an | |
3957 | instance. */ | |
3958 | ||
3959 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); | |
3960 | found; found = TREE_CHAIN (found)) | |
3961 | { | |
3962 | int success; | |
3963 | tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found)); | |
3964 | ||
3965 | /* We only want partial instantiations, here, not | |
3966 | specializations or full instantiations. */ | |
370af2d5 | 3967 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found)) |
9fbf56f7 MM |
3968 | || !uses_template_parms (TREE_VALUE (found))) |
3969 | continue; | |
3970 | ||
3971 | /* Temporarily reduce by one the number of levels in the | |
3972 | ARGLIST and in FOUND so as to avoid comparing the | |
3973 | last set of arguments. */ | |
3974 | TREE_VEC_LENGTH (arglist)--; | |
3975 | TREE_VEC_LENGTH (TREE_PURPOSE (found)) --; | |
3976 | ||
3977 | /* See if the arguments match. If they do, then TMPL is | |
3978 | the partial instantiation we want. */ | |
3979 | success = comp_template_args (TREE_PURPOSE (found), arglist); | |
3980 | ||
3981 | /* Restore the argument vectors to their full size. */ | |
3982 | TREE_VEC_LENGTH (arglist)++; | |
3983 | TREE_VEC_LENGTH (TREE_PURPOSE (found))++; | |
3984 | ||
3985 | if (success) | |
3986 | { | |
3987 | found = tmpl; | |
3988 | break; | |
3989 | } | |
3990 | } | |
3991 | ||
3992 | if (!found) | |
3993 | my_friendly_abort (0); | |
3994 | } | |
3995 | ||
ed44da02 | 3996 | SET_TYPE_TEMPLATE_INFO (t, |
9fbf56f7 | 3997 | tree_cons (found, arglist, NULL_TREE)); |
dbfe2124 MM |
3998 | DECL_TEMPLATE_INSTANTIATIONS (template) |
3999 | = tree_cons (arglist, t, | |
4000 | DECL_TEMPLATE_INSTANTIATIONS (template)); | |
4001 | ||
4002 | if (TREE_CODE (t) == ENUMERAL_TYPE | |
4003 | && !is_partial_instantiation) | |
61a127b3 MM |
4004 | /* Now that the type has been registered on the instantiations |
4005 | list, we set up the enumerators. Because the enumeration | |
4006 | constants may involve the enumeration type itself, we make | |
4007 | sure to register the type first, and then create the | |
4008 | constants. That way, doing tsubst_expr for the enumeration | |
4009 | constants won't result in recursive calls here; we'll find | |
4010 | the instantiation and exit above. */ | |
4011 | tsubst_enum (template_type, t, arglist); | |
dbfe2124 | 4012 | |
36a117a5 MM |
4013 | /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO |
4014 | is set up. */ | |
ed44da02 MM |
4015 | if (TREE_CODE (t) != ENUMERAL_TYPE) |
4016 | DECL_NAME (type_decl) = classtype_mangled_name (t); | |
36a117a5 | 4017 | DECL_ASSEMBLER_NAME (type_decl) = DECL_NAME (type_decl); |
dbfe2124 | 4018 | if (!is_partial_instantiation) |
36a117a5 MM |
4019 | { |
4020 | DECL_ASSEMBLER_NAME (type_decl) | |
4021 | = get_identifier (build_overload_name (t, 1, 1)); | |
50a6dbd7 JM |
4022 | |
4023 | /* For backwards compatibility; code that uses | |
4024 | -fexternal-templates expects looking up a template to | |
4025 | instantiate it. I think DDD still relies on this. | |
4026 | (jason 8/20/1998) */ | |
ed44da02 MM |
4027 | if (TREE_CODE (t) != ENUMERAL_TYPE |
4028 | && flag_external_templates | |
36a117a5 MM |
4029 | && CLASSTYPE_INTERFACE_KNOWN (TREE_TYPE (template)) |
4030 | && ! CLASSTYPE_INTERFACE_ONLY (TREE_TYPE (template))) | |
4031 | add_pending_template (t); | |
4032 | } | |
4033 | else | |
077e7015 MM |
4034 | /* If the type makes use of template parameters, the |
4035 | code that generates debugging information will crash. */ | |
4036 | DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1; | |
8d08fdba | 4037 | |
36a117a5 MM |
4038 | return t; |
4039 | } | |
8d08fdba MS |
4040 | } |
4041 | \f | |
8dfaeb63 | 4042 | struct pair_fn_data |
8d08fdba | 4043 | { |
8dfaeb63 MM |
4044 | tree_fn_t fn; |
4045 | void *data; | |
4046 | }; | |
4047 | ||
4048 | /* Called from for_each_template_parm via walk_tree. */ | |
581d38d0 | 4049 | |
8dfaeb63 MM |
4050 | static tree |
4051 | for_each_template_parm_r (tp, walk_subtrees, d) | |
4052 | tree *tp; | |
4053 | int *walk_subtrees; | |
4054 | void *d; | |
4055 | { | |
4056 | tree t = *tp; | |
4057 | struct pair_fn_data *pfd = (struct pair_fn_data *) d; | |
4058 | tree_fn_t fn = pfd->fn; | |
4059 | void *data = pfd->data; | |
4060 | ||
2f939d94 | 4061 | if (TYPE_P (t) |
581d38d0 | 4062 | && for_each_template_parm (TYPE_CONTEXT (t), fn, data)) |
8dfaeb63 | 4063 | return error_mark_node; |
581d38d0 | 4064 | |
8d08fdba MS |
4065 | switch (TREE_CODE (t)) |
4066 | { | |
8d08fdba | 4067 | case RECORD_TYPE: |
b7484fbe | 4068 | if (TYPE_PTRMEMFUNC_FLAG (t)) |
8dfaeb63 | 4069 | break; |
ed44da02 MM |
4070 | /* Fall through. */ |
4071 | ||
8d08fdba | 4072 | case UNION_TYPE: |
ed44da02 | 4073 | case ENUMERAL_TYPE: |
8dfaeb63 MM |
4074 | if (!TYPE_TEMPLATE_INFO (t)) |
4075 | *walk_subtrees = 0; | |
4076 | else if (for_each_template_parm (TREE_VALUE (TYPE_TEMPLATE_INFO (t)), | |
4077 | fn, data)) | |
4078 | return error_mark_node; | |
4079 | break; | |
4080 | ||
588c2d1c | 4081 | case METHOD_TYPE: |
8dfaeb63 MM |
4082 | /* Since we're not going to walk subtrees, we have to do this |
4083 | explicitly here. */ | |
588c2d1c | 4084 | if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data)) |
8dfaeb63 | 4085 | return error_mark_node; |
588c2d1c MM |
4086 | |
4087 | case FUNCTION_TYPE: | |
8dfaeb63 MM |
4088 | /* Check the return type. */ |
4089 | if (for_each_template_parm (TREE_TYPE (t), fn, data)) | |
4090 | return error_mark_node; | |
4091 | ||
588c2d1c MM |
4092 | /* Check the parameter types. Since default arguments are not |
4093 | instantiated until they are needed, the TYPE_ARG_TYPES may | |
4094 | contain expressions that involve template parameters. But, | |
4095 | no-one should be looking at them yet. And, once they're | |
4096 | instantiated, they don't contain template parameters, so | |
4097 | there's no point in looking at them then, either. */ | |
4098 | { | |
4099 | tree parm; | |
4100 | ||
4101 | for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm)) | |
4102 | if (for_each_template_parm (TREE_VALUE (parm), fn, data)) | |
8dfaeb63 | 4103 | return error_mark_node; |
5566b478 | 4104 | |
8dfaeb63 MM |
4105 | /* Since we've already handled the TYPE_ARG_TYPES, we don't |
4106 | want walk_tree walking into them itself. */ | |
4107 | *walk_subtrees = 0; | |
4108 | } | |
4109 | break; | |
3ac3d9ea | 4110 | |
8d08fdba | 4111 | case FUNCTION_DECL: |
5566b478 | 4112 | case VAR_DECL: |
5566b478 | 4113 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t) |
050367a3 | 4114 | && for_each_template_parm (DECL_TI_ARGS (t), fn, data)) |
8dfaeb63 MM |
4115 | return error_mark_node; |
4116 | /* Fall through. */ | |
4117 | ||
4118 | case CONST_DECL: | |
8d08fdba | 4119 | case PARM_DECL: |
050367a3 MM |
4120 | if (DECL_CONTEXT (t) |
4121 | && for_each_template_parm (DECL_CONTEXT (t), fn, data)) | |
8dfaeb63 MM |
4122 | return error_mark_node; |
4123 | break; | |
8d08fdba | 4124 | |
73b0fce8 | 4125 | case TEMPLATE_TEMPLATE_PARM: |
744fac59 | 4126 | /* Record template parameters such as `T' inside `TT<T>'. */ |
7ddedda4 MM |
4127 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t) |
4128 | && for_each_template_parm (TYPE_TI_ARGS (t), fn, data)) | |
8dfaeb63 MM |
4129 | return error_mark_node; |
4130 | /* Fall through. */ | |
4131 | ||
744fac59 | 4132 | case TEMPLATE_TYPE_PARM: |
f84b4be9 | 4133 | case TEMPLATE_PARM_INDEX: |
8dfaeb63 MM |
4134 | if (fn && (*fn)(t, data)) |
4135 | return error_mark_node; | |
4136 | else if (!fn) | |
4137 | return error_mark_node; | |
4138 | break; | |
5156628f | 4139 | |
8dfaeb63 MM |
4140 | case TEMPLATE_DECL: |
4141 | /* A template template parameter is encountered */ | |
4142 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t) | |
4143 | && for_each_template_parm (TREE_TYPE (t), fn, data)) | |
4144 | return error_mark_node; | |
db5ae43f | 4145 | |
8dfaeb63 MM |
4146 | /* Already substituted template template parameter */ |
4147 | *walk_subtrees = 0; | |
4148 | break; | |
b8865407 | 4149 | |
4699c561 | 4150 | case TYPENAME_TYPE: |
8dfaeb63 MM |
4151 | if (!fn || for_each_template_parm (TYPENAME_TYPE_FULLNAME (t), fn, data)) |
4152 | return error_mark_node; | |
4153 | break; | |
4699c561 | 4154 | |
8dfaeb63 MM |
4155 | case CONSTRUCTOR: |
4156 | if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)) | |
4157 | && for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE | |
4158 | (TREE_TYPE (t)), fn, data)) | |
4159 | return error_mark_node; | |
4160 | break; | |
4161 | ||
b8865407 MM |
4162 | case INDIRECT_REF: |
4163 | case COMPONENT_REF: | |
4699c561 | 4164 | /* If there's no type, then this thing must be some expression |
b8865407 | 4165 | involving template parameters. */ |
4699c561 | 4166 | if (!fn && !TREE_TYPE (t)) |
8dfaeb63 MM |
4167 | return error_mark_node; |
4168 | break; | |
b8865407 | 4169 | |
42976354 BK |
4170 | case MODOP_EXPR: |
4171 | case CAST_EXPR: | |
4172 | case REINTERPRET_CAST_EXPR: | |
4173 | case CONST_CAST_EXPR: | |
4174 | case STATIC_CAST_EXPR: | |
4175 | case DYNAMIC_CAST_EXPR: | |
42976354 BK |
4176 | case ARROW_EXPR: |
4177 | case DOTSTAR_EXPR: | |
4178 | case TYPEID_EXPR: | |
b8865407 | 4179 | case LOOKUP_EXPR: |
40242ccf | 4180 | case PSEUDO_DTOR_EXPR: |
b8865407 | 4181 | if (!fn) |
8dfaeb63 MM |
4182 | return error_mark_node; |
4183 | break; | |
abff8e06 | 4184 | |
8d08fdba | 4185 | default: |
8dfaeb63 | 4186 | break; |
8d08fdba | 4187 | } |
8dfaeb63 MM |
4188 | |
4189 | /* We didn't find any template parameters we liked. */ | |
4190 | return NULL_TREE; | |
4191 | } | |
4192 | ||
4193 | /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM, or | |
4194 | TEMPLATE_PARM_INDEX in T, call FN with the parameter and the DATA. | |
4195 | If FN returns non-zero, the iteration is terminated, and | |
4196 | for_each_template_parm returns 1. Otherwise, the iteration | |
4197 | continues. If FN never returns a non-zero value, the value | |
4198 | returned by for_each_template_parm is 0. If FN is NULL, it is | |
4199 | considered to be the function which always returns 1. */ | |
4200 | ||
4201 | static int | |
4202 | for_each_template_parm (t, fn, data) | |
4203 | tree t; | |
4204 | tree_fn_t fn; | |
4205 | void* data; | |
4206 | { | |
4207 | struct pair_fn_data pfd; | |
4208 | ||
4209 | /* Set up. */ | |
4210 | pfd.fn = fn; | |
4211 | pfd.data = data; | |
4212 | ||
4213 | /* Walk the tree. */ | |
4214 | return walk_tree (&t, for_each_template_parm_r, &pfd) != NULL_TREE; | |
8d08fdba MS |
4215 | } |
4216 | ||
050367a3 MM |
4217 | int |
4218 | uses_template_parms (t) | |
4219 | tree t; | |
4220 | { | |
4221 | return for_each_template_parm (t, 0, 0); | |
4222 | } | |
4223 | ||
27fafc8d JM |
4224 | static struct tinst_level *current_tinst_level; |
4225 | static struct tinst_level *free_tinst_level; | |
4226 | static int tinst_depth; | |
e9f32eb5 | 4227 | extern int max_tinst_depth; |
5566b478 | 4228 | #ifdef GATHER_STATISTICS |
27fafc8d | 4229 | int depth_reached; |
5566b478 | 4230 | #endif |
8dfaeb63 MM |
4231 | static int tinst_level_tick; |
4232 | static int last_template_error_tick; | |
8d08fdba | 4233 | |
7bae46f4 | 4234 | /* Print out all the template instantiations that we are currently |
27fafc8d JM |
4235 | working on. If ERR, we are being called from cp_thing, so do |
4236 | the right thing for an error message. */ | |
7bae46f4 | 4237 | |
27fafc8d JM |
4238 | static void |
4239 | print_template_context (err) | |
4240 | int err; | |
7bae46f4 JM |
4241 | { |
4242 | struct tinst_level *p = current_tinst_level; | |
4243 | int line = lineno; | |
4244 | char *file = input_filename; | |
4245 | ||
49e04385 | 4246 | if (err && p) |
27fafc8d | 4247 | { |
49e04385 MM |
4248 | if (current_function_decl != p->decl |
4249 | && current_function_decl != NULL_TREE) | |
4250 | /* We can get here during the processing of some synthesized | |
4251 | method. Then, p->decl will be the function that's causing | |
4252 | the synthesis. */ | |
4253 | ; | |
27fafc8d | 4254 | else |
27fafc8d | 4255 | { |
49e04385 MM |
4256 | if (current_function_decl == p->decl) |
4257 | /* Avoid redundancy with the the "In function" line. */; | |
4258 | else | |
4259 | fprintf (stderr, "%s: In instantiation of `%s':\n", | |
9e93bc9d | 4260 | file, decl_as_string (p->decl, TS_DECL_TYPE | TS_FUNC_NORETURN)); |
49e04385 | 4261 | |
038fb86f JM |
4262 | line = p->line; |
4263 | file = p->file; | |
27fafc8d JM |
4264 | p = p->next; |
4265 | } | |
4266 | } | |
4267 | ||
7bae46f4 JM |
4268 | for (; p; p = p->next) |
4269 | { | |
038fb86f | 4270 | fprintf (stderr, "%s:%d: instantiated from `%s'\n", file, line, |
9e93bc9d | 4271 | decl_as_string (p->decl, TS_DECL_TYPE | TS_FUNC_NORETURN)); |
038fb86f JM |
4272 | line = p->line; |
4273 | file = p->file; | |
7bae46f4 | 4274 | } |
038fb86f | 4275 | fprintf (stderr, "%s:%d: instantiated from here\n", file, line); |
7bae46f4 JM |
4276 | } |
4277 | ||
27fafc8d JM |
4278 | /* Called from cp_thing to print the template context for an error. */ |
4279 | ||
4280 | void | |
4281 | maybe_print_template_context () | |
4282 | { | |
4283 | if (last_template_error_tick == tinst_level_tick | |
4284 | || current_tinst_level == 0) | |
4285 | return; | |
4286 | ||
4287 | last_template_error_tick = tinst_level_tick; | |
4288 | print_template_context (1); | |
4289 | } | |
4290 | ||
bd6dd845 | 4291 | static int |
5566b478 MS |
4292 | push_tinst_level (d) |
4293 | tree d; | |
8d08fdba MS |
4294 | { |
4295 | struct tinst_level *new; | |
8d08fdba | 4296 | |
7215f9a0 MS |
4297 | if (tinst_depth >= max_tinst_depth) |
4298 | { | |
8adf5b5e JM |
4299 | /* If the instantiation in question still has unbound template parms, |
4300 | we don't really care if we can't instantiate it, so just return. | |
4301 | This happens with base instantiation for implicit `typename'. */ | |
4302 | if (uses_template_parms (d)) | |
4303 | return 0; | |
4304 | ||
1139b3d8 | 4305 | last_template_error_tick = tinst_level_tick; |
b4f4233d GDR |
4306 | cp_error ("template instantiation depth exceeds maximum of %d (use -ftemplate-depth-NN to increase the maximum) instantiating `%D'", |
4307 | max_tinst_depth, d); | |
5566b478 | 4308 | |
27fafc8d | 4309 | print_template_context (0); |
5566b478 | 4310 | |
7215f9a0 MS |
4311 | return 0; |
4312 | } | |
4313 | ||
8d08fdba MS |
4314 | if (free_tinst_level) |
4315 | { | |
4316 | new = free_tinst_level; | |
4317 | free_tinst_level = new->next; | |
4318 | } | |
4319 | else | |
4320 | new = (struct tinst_level *) xmalloc (sizeof (struct tinst_level)); | |
4321 | ||
5566b478 MS |
4322 | new->decl = d; |
4323 | new->line = lineno; | |
4324 | new->file = input_filename; | |
8d08fdba MS |
4325 | new->next = current_tinst_level; |
4326 | current_tinst_level = new; | |
5566b478 | 4327 | |
7215f9a0 | 4328 | ++tinst_depth; |
5566b478 MS |
4329 | #ifdef GATHER_STATISTICS |
4330 | if (tinst_depth > depth_reached) | |
4331 | depth_reached = tinst_depth; | |
4332 | #endif | |
4333 | ||
27fafc8d | 4334 | ++tinst_level_tick; |
7215f9a0 | 4335 | return 1; |
8d08fdba MS |
4336 | } |
4337 | ||
4338 | void | |
4339 | pop_tinst_level () | |
4340 | { | |
4341 | struct tinst_level *old = current_tinst_level; | |
4342 | ||
ae58fa02 MM |
4343 | /* Restore the filename and line number stashed away when we started |
4344 | this instantiation. */ | |
4345 | lineno = old->line; | |
4346 | input_filename = old->file; | |
5f2c99c4 | 4347 | extract_interface_info (); |
ae58fa02 | 4348 | |
8d08fdba MS |
4349 | current_tinst_level = old->next; |
4350 | old->next = free_tinst_level; | |
4351 | free_tinst_level = old; | |
7215f9a0 | 4352 | --tinst_depth; |
27fafc8d | 4353 | ++tinst_level_tick; |
8d08fdba MS |
4354 | } |
4355 | ||
4356 | struct tinst_level * | |
4357 | tinst_for_decl () | |
4358 | { | |
4359 | struct tinst_level *p = current_tinst_level; | |
4360 | ||
4361 | if (p) | |
4362 | for (; p->next ; p = p->next ) | |
4363 | ; | |
4364 | return p; | |
4365 | } | |
4366 | ||
f84b4be9 JM |
4367 | /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the |
4368 | vector of template arguments, as for tsubst. | |
4369 | ||
4370 | Returns an appropriate tsbust'd friend declaration. */ | |
4371 | ||
4372 | static tree | |
4373 | tsubst_friend_function (decl, args) | |
4374 | tree decl; | |
4375 | tree args; | |
4376 | { | |
4377 | tree new_friend; | |
27fafc8d JM |
4378 | int line = lineno; |
4379 | char *file = input_filename; | |
4380 | ||
4381 | lineno = DECL_SOURCE_LINE (decl); | |
4382 | input_filename = DECL_SOURCE_FILE (decl); | |
4383 | ||
f84b4be9 JM |
4384 | if (TREE_CODE (decl) == FUNCTION_DECL |
4385 | && DECL_TEMPLATE_INSTANTIATION (decl) | |
4386 | && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) | |
4387 | /* This was a friend declared with an explicit template | |
4388 | argument list, e.g.: | |
4389 | ||
4390 | friend void f<>(T); | |
4391 | ||
4392 | to indicate that f was a template instantiation, not a new | |
4393 | function declaration. Now, we have to figure out what | |
4394 | instantiation of what template. */ | |
4395 | { | |
4396 | tree template_id; | |
4397 | tree new_args; | |
4398 | tree tmpl; | |
f84b4be9 JM |
4399 | |
4400 | template_id | |
4401 | = lookup_template_function (tsubst_expr (DECL_TI_TEMPLATE (decl), | |
4393e105 MM |
4402 | args, /*complain=*/1, |
4403 | NULL_TREE), | |
f84b4be9 | 4404 | tsubst (DECL_TI_ARGS (decl), |
4393e105 MM |
4405 | args, /*complain=*/1, |
4406 | NULL_TREE)); | |
4393e105 | 4407 | new_friend = tsubst (decl, args, /*complain=*/1, NULL_TREE); |
36a117a5 MM |
4408 | tmpl = determine_specialization (template_id, new_friend, |
4409 | &new_args, | |
bf8f3f93 | 4410 | /*need_member_template=*/0); |
27fafc8d JM |
4411 | new_friend = instantiate_template (tmpl, new_args); |
4412 | goto done; | |
f84b4be9 | 4413 | } |
36a117a5 | 4414 | |
4393e105 | 4415 | new_friend = tsubst (decl, args, /*complain=*/1, NULL_TREE); |
f84b4be9 | 4416 | |
36a117a5 | 4417 | /* The NEW_FRIEND will look like an instantiation, to the |
f84b4be9 JM |
4418 | compiler, but is not an instantiation from the point of view of |
4419 | the language. For example, we might have had: | |
4420 | ||
4421 | template <class T> struct S { | |
4422 | template <class U> friend void f(T, U); | |
4423 | }; | |
4424 | ||
4425 | Then, in S<int>, template <class U> void f(int, U) is not an | |
4426 | instantiation of anything. */ | |
4427 | DECL_USE_TEMPLATE (new_friend) = 0; | |
4428 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
4429 | DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0; | |
36a117a5 MM |
4430 | |
4431 | /* The mangled name for the NEW_FRIEND is incorrect. The call to | |
4432 | tsubst will have resulted in a call to | |
4433 | set_mangled_name_for_template_decl. But, the function is not a | |
4434 | template instantiation and should not be mangled like one. | |
4435 | Therefore, we remangle the function name. We don't have to do | |
4436 | this if the NEW_FRIEND is a template since | |
4437 | set_mangled_name_for_template_decl doesn't do anything if the | |
4438 | function declaration still uses template arguments. */ | |
4439 | if (TREE_CODE (new_friend) != TEMPLATE_DECL) | |
4440 | { | |
4441 | set_mangled_name_for_decl (new_friend); | |
4442 | DECL_RTL (new_friend) = 0; | |
4443 | make_decl_rtl (new_friend, NULL_PTR, 1); | |
4444 | } | |
4445 | ||
6eb3bb27 | 4446 | if (DECL_NAMESPACE_SCOPE_P (new_friend)) |
f84b4be9 | 4447 | { |
36a117a5 | 4448 | tree old_decl; |
fbf1c34b MM |
4449 | tree new_friend_template_info; |
4450 | tree new_friend_result_template_info; | |
92da7074 | 4451 | tree ns; |
fbf1c34b MM |
4452 | int new_friend_is_defn; |
4453 | ||
4454 | /* We must save some information from NEW_FRIEND before calling | |
4455 | duplicate decls since that function will free NEW_FRIEND if | |
4456 | possible. */ | |
4457 | new_friend_template_info = DECL_TEMPLATE_INFO (new_friend); | |
f84b4be9 | 4458 | if (TREE_CODE (new_friend) == TEMPLATE_DECL) |
fbf1c34b MM |
4459 | { |
4460 | /* This declaration is a `primary' template. */ | |
4461 | DECL_PRIMARY_TEMPLATE (new_friend) = new_friend; | |
4462 | ||
4463 | new_friend_is_defn | |
17aec3eb | 4464 | = DECL_INITIAL (DECL_TEMPLATE_RESULT (new_friend)) != NULL_TREE; |
fbf1c34b | 4465 | new_friend_result_template_info |
17aec3eb | 4466 | = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend)); |
fbf1c34b MM |
4467 | } |
4468 | else | |
4469 | { | |
4470 | new_friend_is_defn = DECL_INITIAL (new_friend) != NULL_TREE; | |
4471 | new_friend_result_template_info = NULL_TREE; | |
4472 | } | |
36a117a5 | 4473 | |
1c227897 MM |
4474 | /* Inside pushdecl_namespace_level, we will push into the |
4475 | current namespace. However, the friend function should go | |
4476 | into the namespace of the template. */ | |
92da7074 ML |
4477 | ns = decl_namespace_context (new_friend); |
4478 | push_nested_namespace (ns); | |
36a117a5 | 4479 | old_decl = pushdecl_namespace_level (new_friend); |
92da7074 | 4480 | pop_nested_namespace (ns); |
36a117a5 MM |
4481 | |
4482 | if (old_decl != new_friend) | |
4483 | { | |
4484 | /* This new friend declaration matched an existing | |
4485 | declaration. For example, given: | |
4486 | ||
4487 | template <class T> void f(T); | |
4488 | template <class U> class C { | |
4489 | template <class T> friend void f(T) {} | |
4490 | }; | |
4491 | ||
4492 | the friend declaration actually provides the definition | |
4493 | of `f', once C has been instantiated for some type. So, | |
4494 | old_decl will be the out-of-class template declaration, | |
4495 | while new_friend is the in-class definition. | |
4496 | ||
4497 | But, if `f' was called before this point, the | |
4498 | instantiation of `f' will have DECL_TI_ARGS corresponding | |
4499 | to `T' but not to `U', references to which might appear | |
4500 | in the definition of `f'. Previously, the most general | |
4501 | template for an instantiation of `f' was the out-of-class | |
4502 | version; now it is the in-class version. Therefore, we | |
4503 | run through all specialization of `f', adding to their | |
4504 | DECL_TI_ARGS appropriately. In particular, they need a | |
4505 | new set of outer arguments, corresponding to the | |
4506 | arguments for this class instantiation. | |
4507 | ||
4508 | The same situation can arise with something like this: | |
4509 | ||
4510 | friend void f(int); | |
4511 | template <class T> class C { | |
4512 | friend void f(T) {} | |
4513 | }; | |
4514 | ||
4515 | when `C<int>' is instantiated. Now, `f(int)' is defined | |
4516 | in the class. */ | |
4517 | ||
fbf1c34b MM |
4518 | if (!new_friend_is_defn) |
4519 | /* On the other hand, if the in-class declaration does | |
4520 | *not* provide a definition, then we don't want to alter | |
4521 | existing definitions. We can just leave everything | |
4522 | alone. */ | |
36a117a5 | 4523 | ; |
fbf1c34b | 4524 | else |
36a117a5 | 4525 | { |
fbf1c34b MM |
4526 | /* Overwrite whatever template info was there before, if |
4527 | any, with the new template information pertaining to | |
4528 | the declaration. */ | |
4529 | DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info; | |
4530 | ||
4531 | if (TREE_CODE (old_decl) != TEMPLATE_DECL) | |
4532 | /* duplicate_decls will take care of this case. */ | |
4533 | ; | |
4534 | else | |
36a117a5 | 4535 | { |
fbf1c34b MM |
4536 | tree t; |
4537 | tree new_friend_args; | |
4538 | ||
17aec3eb | 4539 | DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl)) |
fbf1c34b MM |
4540 | = new_friend_result_template_info; |
4541 | ||
4542 | new_friend_args = TI_ARGS (new_friend_template_info); | |
4543 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl); | |
4544 | t != NULL_TREE; | |
4545 | t = TREE_CHAIN (t)) | |
4546 | { | |
4547 | tree spec = TREE_VALUE (t); | |
36a117a5 | 4548 | |
fbf1c34b MM |
4549 | DECL_TI_ARGS (spec) |
4550 | = add_outermost_template_args (new_friend_args, | |
4551 | DECL_TI_ARGS (spec)); | |
fbf1c34b MM |
4552 | } |
4553 | ||
4554 | /* Now, since specializations are always supposed to | |
4555 | hang off of the most general template, we must move | |
4556 | them. */ | |
4557 | t = most_general_template (old_decl); | |
4558 | if (t != old_decl) | |
4559 | { | |
4560 | DECL_TEMPLATE_SPECIALIZATIONS (t) | |
4561 | = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t), | |
4562 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl)); | |
4563 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE; | |
4564 | } | |
36a117a5 MM |
4565 | } |
4566 | } | |
4567 | ||
4568 | /* The information from NEW_FRIEND has been merged into OLD_DECL | |
4569 | by duplicate_decls. */ | |
4570 | new_friend = old_decl; | |
4571 | } | |
f84b4be9 | 4572 | } |
d0f062fb | 4573 | else if (COMPLETE_TYPE_P (DECL_CONTEXT (new_friend))) |
f84b4be9 JM |
4574 | { |
4575 | /* Check to see that the declaration is really present, and, | |
4576 | possibly obtain an improved declaration. */ | |
4577 | tree fn = check_classfn (DECL_CONTEXT (new_friend), | |
4578 | new_friend); | |
4579 | ||
4580 | if (fn) | |
4581 | new_friend = fn; | |
4582 | } | |
4583 | ||
27fafc8d JM |
4584 | done: |
4585 | lineno = line; | |
4586 | input_filename = file; | |
f84b4be9 JM |
4587 | return new_friend; |
4588 | } | |
4589 | ||
1aed5355 MM |
4590 | /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of |
4591 | template arguments, as for tsubst. | |
6757edfe MM |
4592 | |
4593 | Returns an appropriate tsbust'd friend type. */ | |
4594 | ||
4595 | static tree | |
1aed5355 MM |
4596 | tsubst_friend_class (friend_tmpl, args) |
4597 | tree friend_tmpl; | |
6757edfe MM |
4598 | tree args; |
4599 | { | |
1aed5355 | 4600 | tree friend_type; |
25aab5d0 | 4601 | tree tmpl; |
6757edfe | 4602 | |
25aab5d0 MM |
4603 | /* First, we look for a class template. */ |
4604 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/0); | |
4605 | ||
4606 | /* But, if we don't find one, it might be because we're in a | |
4607 | situation like this: | |
4608 | ||
4609 | template <class T> | |
4610 | struct S { | |
4611 | template <class U> | |
4612 | friend struct S; | |
4613 | }; | |
4614 | ||
4615 | Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL | |
4616 | for `S<int>', not the TEMPLATE_DECL. */ | |
bc639f90 | 4617 | if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl)) |
25aab5d0 MM |
4618 | { |
4619 | tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/1); | |
4620 | tmpl = maybe_get_template_decl_from_type_decl (tmpl); | |
4621 | } | |
6757edfe | 4622 | |
25aab5d0 | 4623 | if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl)) |
6757edfe MM |
4624 | { |
4625 | /* The friend template has already been declared. Just | |
36a117a5 MM |
4626 | check to see that the declarations match, and install any new |
4627 | default parameters. We must tsubst the default parameters, | |
4628 | of course. We only need the innermost template parameters | |
4629 | because that is all that redeclare_class_template will look | |
4630 | at. */ | |
4631 | tree parms | |
4632 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl), | |
4393e105 | 4633 | args, /*complain=*/1); |
36a117a5 | 4634 | redeclare_class_template (TREE_TYPE (tmpl), parms); |
6757edfe MM |
4635 | friend_type = TREE_TYPE (tmpl); |
4636 | } | |
4637 | else | |
4638 | { | |
4639 | /* The friend template has not already been declared. In this | |
4640 | case, the instantiation of the template class will cause the | |
4641 | injection of this template into the global scope. */ | |
4393e105 | 4642 | tmpl = tsubst (friend_tmpl, args, /*complain=*/1, NULL_TREE); |
6757edfe MM |
4643 | |
4644 | /* The new TMPL is not an instantiation of anything, so we | |
4645 | forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for | |
4646 | the new type because that is supposed to be the corresponding | |
4647 | template decl, i.e., TMPL. */ | |
4648 | DECL_USE_TEMPLATE (tmpl) = 0; | |
4649 | DECL_TEMPLATE_INFO (tmpl) = NULL_TREE; | |
4650 | CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0; | |
4651 | ||
4652 | /* Inject this template into the global scope. */ | |
4653 | friend_type = TREE_TYPE (pushdecl_top_level (tmpl)); | |
4654 | } | |
4655 | ||
4656 | return friend_type; | |
4657 | } | |
f84b4be9 | 4658 | |
8d08fdba | 4659 | tree |
5566b478 MS |
4660 | instantiate_class_template (type) |
4661 | tree type; | |
8d08fdba | 4662 | { |
61a127b3 | 4663 | tree template, args, pattern, t; |
36a117a5 | 4664 | tree typedecl; |
8d08fdba | 4665 | |
5566b478 | 4666 | if (type == error_mark_node) |
8d08fdba MS |
4667 | return error_mark_node; |
4668 | ||
d0f062fb | 4669 | if (TYPE_BEING_DEFINED (type) || COMPLETE_TYPE_P (type)) |
5566b478 MS |
4670 | return type; |
4671 | ||
6bdb985f | 4672 | /* Figure out which template is being instantiated. */ |
36a117a5 | 4673 | template = most_general_template (CLASSTYPE_TI_TEMPLATE (type)); |
5566b478 | 4674 | my_friendly_assert (TREE_CODE (template) == TEMPLATE_DECL, 279); |
73aad9b9 | 4675 | |
6bdb985f MM |
4676 | /* Figure out which arguments are being used to do the |
4677 | instantiation. */ | |
4678 | args = CLASSTYPE_TI_ARGS (type); | |
4c571114 | 4679 | PARTIAL_INSTANTIATION_P (type) = uses_template_parms (args); |
6bdb985f | 4680 | |
4c571114 MM |
4681 | if (pedantic && PARTIAL_INSTANTIATION_P (type)) |
4682 | /* If this is a partial instantiation, then we can't instantiate | |
4683 | the type; there's no telling whether or not one of the | |
4684 | template parameters might eventually be instantiated to some | |
4685 | value that results in a specialization being used. For | |
4686 | example, consider: | |
4687 | ||
4688 | template <class T> | |
4689 | struct S {}; | |
4690 | ||
4691 | template <class U> | |
4692 | void f(S<U>); | |
4693 | ||
4694 | template <> | |
4695 | struct S<int> {}; | |
4696 | ||
4697 | Now, the `S<U>' in `f<int>' is the specialization, not an | |
5db698f6 | 4698 | instantiation of the original template. */ |
f31c0a32 | 4699 | return type; |
4c571114 MM |
4700 | |
4701 | /* Determine what specialization of the original template to | |
4702 | instantiate. */ | |
4703 | if (PARTIAL_INSTANTIATION_P (type)) | |
6bdb985f MM |
4704 | /* There's no telling which specialization is appropriate at this |
4705 | point. Since all peeking at the innards of this partial | |
4706 | instantiation are extensions (like the "implicit typename" | |
4707 | extension, which allows users to omit the keyword `typename' on | |
4708 | names that are declared as types in template base classes), we | |
4709 | are free to do what we please. | |
4710 | ||
4711 | Trying to figure out which partial instantiation to use can | |
4712 | cause a crash. (Some of the template arguments don't even have | |
4713 | types.) So, we just use the most general version. */ | |
4714 | t = NULL_TREE; | |
4715 | else | |
73aad9b9 | 4716 | { |
6bdb985f MM |
4717 | t = most_specialized_class (template, args); |
4718 | ||
4719 | if (t == error_mark_node) | |
73aad9b9 | 4720 | { |
d8e178a0 | 4721 | const char *str = "candidates are:"; |
6bdb985f MM |
4722 | cp_error ("ambiguous class template instantiation for `%#T'", type); |
4723 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t; | |
4724 | t = TREE_CHAIN (t)) | |
73aad9b9 | 4725 | { |
6bdb985f MM |
4726 | if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), |
4727 | args)) | |
4728 | { | |
4729 | cp_error_at ("%s %+#T", str, TREE_TYPE (t)); | |
4730 | str = " "; | |
4731 | } | |
73aad9b9 | 4732 | } |
6bdb985f | 4733 | TYPE_BEING_DEFINED (type) = 1; |
f31c0a32 | 4734 | return error_mark_node; |
73aad9b9 | 4735 | } |
73aad9b9 | 4736 | } |
6bdb985f MM |
4737 | |
4738 | if (t) | |
73aad9b9 JM |
4739 | pattern = TREE_TYPE (t); |
4740 | else | |
4741 | pattern = TREE_TYPE (template); | |
5566b478 | 4742 | |
4c571114 MM |
4743 | /* If the template we're instantiating is incomplete, then clearly |
4744 | there's nothing we can do. */ | |
d0f062fb | 4745 | if (!COMPLETE_TYPE_P (pattern)) |
f31c0a32 | 4746 | return type; |
5566b478 | 4747 | |
4c571114 MM |
4748 | /* If this is a partial instantiation, don't tsubst anything. We will |
4749 | only use this type for implicit typename, so the actual contents don't | |
4750 | matter. All that matters is whether a particular name is a type. */ | |
4751 | if (PARTIAL_INSTANTIATION_P (type)) | |
4752 | { | |
4753 | /* The fields set here must be kept in sync with those cleared | |
4754 | in begin_class_definition. */ | |
4755 | TYPE_BINFO_BASETYPES (type) = TYPE_BINFO_BASETYPES (pattern); | |
4756 | TYPE_FIELDS (type) = TYPE_FIELDS (pattern); | |
4757 | TYPE_METHODS (type) = TYPE_METHODS (pattern); | |
4758 | CLASSTYPE_TAGS (type) = CLASSTYPE_TAGS (pattern); | |
4759 | /* Pretend that the type is complete, so that we will look | |
4760 | inside it during name lookup and such. */ | |
867580ce | 4761 | TYPE_SIZE (type) = bitsize_zero_node; |
f31c0a32 | 4762 | return type; |
4c571114 MM |
4763 | } |
4764 | ||
4765 | /* If we've recursively instantiated too many templates, stop. */ | |
4766 | if (! push_tinst_level (type)) | |
f31c0a32 | 4767 | return type; |
4c571114 MM |
4768 | |
4769 | /* Now we're really doing the instantiation. Mark the type as in | |
4770 | the process of being defined. */ | |
4771 | TYPE_BEING_DEFINED (type) = 1; | |
4772 | ||
4773 | maybe_push_to_top_level (uses_template_parms (type)); | |
4c571114 | 4774 | |
73aad9b9 | 4775 | if (t) |
36a117a5 MM |
4776 | { |
4777 | /* This TYPE is actually a instantiation of of a partial | |
4778 | specialization. We replace the innermost set of ARGS with | |
4779 | the arguments appropriate for substitution. For example, | |
4780 | given: | |
4781 | ||
4782 | template <class T> struct S {}; | |
4783 | template <class T> struct S<T*> {}; | |
4784 | ||
4785 | and supposing that we are instantiating S<int*>, ARGS will | |
4786 | present be {int*} but we need {int}. */ | |
4787 | tree inner_args | |
4788 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), | |
4789 | args); | |
4790 | ||
4791 | /* If there were multiple levels in ARGS, replacing the | |
4792 | innermost level would alter CLASSTYPE_TI_ARGS, which we don't | |
4793 | want, so we make a copy first. */ | |
4794 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args)) | |
4795 | { | |
4796 | args = copy_node (args); | |
4797 | SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args); | |
4798 | } | |
4799 | else | |
4800 | args = inner_args; | |
4801 | } | |
8d019cef | 4802 | |
5566b478 MS |
4803 | if (flag_external_templates) |
4804 | { | |
4805 | if (flag_alt_external_templates) | |
4806 | { | |
4807 | CLASSTYPE_INTERFACE_ONLY (type) = interface_only; | |
4808 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X (type, interface_unknown); | |
4809 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4810 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4811 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4812 | } |
4813 | else | |
4814 | { | |
4815 | CLASSTYPE_INTERFACE_ONLY (type) = CLASSTYPE_INTERFACE_ONLY (pattern); | |
4816 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X | |
4817 | (type, CLASSTYPE_INTERFACE_UNKNOWN (pattern)); | |
4818 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4819 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4820 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4821 | } |
4822 | } | |
4823 | else | |
8d08fdba | 4824 | { |
5566b478 MS |
4825 | SET_CLASSTYPE_INTERFACE_UNKNOWN (type); |
4826 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) = 1; | |
8d08fdba MS |
4827 | } |
4828 | ||
f7da6097 MS |
4829 | TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern); |
4830 | TYPE_HAS_DESTRUCTOR (type) = TYPE_HAS_DESTRUCTOR (pattern); | |
f7da6097 MS |
4831 | TYPE_OVERLOADS_CALL_EXPR (type) = TYPE_OVERLOADS_CALL_EXPR (pattern); |
4832 | TYPE_OVERLOADS_ARRAY_REF (type) = TYPE_OVERLOADS_ARRAY_REF (pattern); | |
4833 | TYPE_OVERLOADS_ARROW (type) = TYPE_OVERLOADS_ARROW (pattern); | |
834c6dff MM |
4834 | TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern); |
4835 | TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern); | |
f7da6097 MS |
4836 | TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern); |
4837 | TYPE_VEC_DELETE_TAKES_SIZE (type) = TYPE_VEC_DELETE_TAKES_SIZE (pattern); | |
4838 | TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern); | |
4839 | TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern); | |
4840 | TYPE_HAS_ABSTRACT_ASSIGN_REF (type) = TYPE_HAS_ABSTRACT_ASSIGN_REF (pattern); | |
4841 | TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern); | |
4842 | TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern); | |
f7da6097 MS |
4843 | TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern); |
4844 | TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern); | |
4c6b7393 MM |
4845 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (type) |
4846 | = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (pattern); | |
f7da6097 MS |
4847 | TYPE_USES_MULTIPLE_INHERITANCE (type) |
4848 | = TYPE_USES_MULTIPLE_INHERITANCE (pattern); | |
4849 | TYPE_USES_VIRTUAL_BASECLASSES (type) | |
4850 | = TYPE_USES_VIRTUAL_BASECLASSES (pattern); | |
4851 | TYPE_PACKED (type) = TYPE_PACKED (pattern); | |
4852 | TYPE_ALIGN (type) = TYPE_ALIGN (pattern); | |
eff71ab0 | 4853 | TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */ |
6bdb8141 JM |
4854 | if (ANON_AGGR_TYPE_P (pattern)) |
4855 | SET_ANON_AGGR_TYPE_P (type); | |
f7da6097 | 4856 | |
3fd71a52 MM |
4857 | if (TYPE_BINFO_BASETYPES (pattern)) |
4858 | { | |
4859 | tree base_list = NULL_TREE; | |
4860 | tree pbases = TYPE_BINFO_BASETYPES (pattern); | |
4861 | int i; | |
5566b478 | 4862 | |
3fd71a52 MM |
4863 | /* Substitute into each of the bases to determine the actual |
4864 | basetypes. */ | |
4865 | for (i = 0; i < TREE_VEC_LENGTH (pbases); ++i) | |
4866 | { | |
4867 | tree base; | |
4868 | tree access; | |
4869 | tree pbase; | |
5566b478 | 4870 | |
3fd71a52 | 4871 | pbase = TREE_VEC_ELT (pbases, i); |
711734a9 | 4872 | |
3fd71a52 MM |
4873 | /* Substitue to figure out the base class. */ |
4874 | base = tsubst (BINFO_TYPE (pbase), args, | |
4875 | /*complain=*/1, NULL_TREE); | |
4876 | if (base == error_mark_node) | |
4877 | continue; | |
711734a9 | 4878 | |
3fd71a52 MM |
4879 | /* Calculate the correct access node. */ |
4880 | if (TREE_VIA_VIRTUAL (pbase)) | |
4881 | { | |
4882 | if (TREE_VIA_PUBLIC (pbase)) | |
4883 | access = access_public_virtual_node; | |
4884 | else if (TREE_VIA_PROTECTED (pbase)) | |
4885 | access = access_protected_virtual_node; | |
d6479fe7 | 4886 | else |
3fd71a52 MM |
4887 | access = access_private_virtual_node; |
4888 | } | |
4889 | else | |
4890 | { | |
4891 | if (TREE_VIA_PUBLIC (pbase)) | |
4892 | access = access_public_node; | |
4893 | else if (TREE_VIA_PROTECTED (pbase)) | |
4894 | access = access_protected_node; | |
d6479fe7 | 4895 | else |
3fd71a52 MM |
4896 | access = access_private_node; |
4897 | } | |
dfbcd65a | 4898 | |
3fd71a52 MM |
4899 | base_list = tree_cons (access, base, base_list); |
4900 | } | |
dfbcd65a | 4901 | |
3fd71a52 MM |
4902 | /* The list is now in reverse order; correct that. */ |
4903 | base_list = nreverse (base_list); | |
4904 | ||
4905 | /* Now call xref_basetypes to set up all the base-class | |
4906 | information. */ | |
4907 | xref_basetypes (TREE_CODE (pattern) == RECORD_TYPE | |
4908 | ? (CLASSTYPE_DECLARED_CLASS (pattern) | |
4909 | ? class_type_node : record_type_node) | |
4910 | : union_type_node, | |
4911 | DECL_NAME (TYPE_NAME (pattern)), | |
4912 | type, | |
4913 | base_list); | |
4914 | } | |
5566b478 | 4915 | |
b74a0560 MM |
4916 | /* Now that our base classes are set up, enter the scope of the |
4917 | class, so that name lookups into base classes, etc. will work | |
4918 | corectly. This is precisely analagous to what we do in | |
4919 | begin_class_definition when defining an ordinary non-template | |
4920 | class. */ | |
4921 | pushclass (type, 1); | |
4922 | ||
5566b478 | 4923 | for (t = CLASSTYPE_TAGS (pattern); t; t = TREE_CHAIN (t)) |
8d08fdba | 4924 | { |
5566b478 | 4925 | tree tag = TREE_VALUE (t); |
36a117a5 MM |
4926 | tree name = TYPE_IDENTIFIER (tag); |
4927 | tree newtag; | |
5566b478 | 4928 | |
4393e105 | 4929 | newtag = tsubst (tag, args, /*complain=*/1, NULL_TREE); |
61a127b3 | 4930 | if (TREE_CODE (newtag) != ENUMERAL_TYPE) |
ed44da02 | 4931 | { |
486e4077 MM |
4932 | if (TYPE_LANG_SPECIFIC (tag) && CLASSTYPE_IS_TEMPLATE (tag)) |
4933 | /* Unfortunately, lookup_template_class sets | |
4934 | CLASSTYPE_IMPLICIT_INSTANTIATION for a partial | |
4935 | instantiation (i.e., for the type of a member template | |
4936 | class nested within a template class.) This behavior is | |
4937 | required for maybe_process_partial_specialization to work | |
4938 | correctly, but is not accurate in this case; the TAG is not | |
4939 | an instantiation of anything. (The corresponding | |
4940 | TEMPLATE_DECL is an instantiation, but the TYPE is not.) */ | |
4941 | CLASSTYPE_USE_TEMPLATE (newtag) = 0; | |
4942 | ||
ed44da02 MM |
4943 | /* Now, we call pushtag to put this NEWTAG into the scope of |
4944 | TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid | |
4945 | pushtag calling push_template_decl. We don't have to do | |
4946 | this for enums because it will already have been done in | |
4947 | tsubst_enum. */ | |
4948 | if (name) | |
4949 | SET_IDENTIFIER_TYPE_VALUE (name, newtag); | |
4950 | pushtag (name, newtag, /*globalize=*/0); | |
4951 | } | |
8d08fdba MS |
4952 | } |
4953 | ||
5566b478 MS |
4954 | /* Don't replace enum constants here. */ |
4955 | for (t = TYPE_FIELDS (pattern); t; t = TREE_CHAIN (t)) | |
8dd3f57a | 4956 | if (TREE_CODE (t) != CONST_DECL) |
5566b478 | 4957 | { |
ae58fa02 MM |
4958 | tree r; |
4959 | ||
4960 | /* The the file and line for this declaration, to assist in | |
4961 | error message reporting. Since we called push_tinst_level | |
4962 | above, we don't need to restore these. */ | |
4963 | lineno = DECL_SOURCE_LINE (t); | |
4964 | input_filename = DECL_SOURCE_FILE (t); | |
4965 | ||
4393e105 | 4966 | r = tsubst (t, args, /*complain=*/1, NULL_TREE); |
5566b478 MS |
4967 | if (TREE_CODE (r) == VAR_DECL) |
4968 | { | |
fa8d6e85 MM |
4969 | tree init; |
4970 | ||
94c82a77 | 4971 | if (DECL_DEFINED_IN_CLASS_P (r)) |
fa8d6e85 MM |
4972 | init = tsubst_expr (DECL_INITIAL (t), args, |
4973 | /*complain=*/1, NULL_TREE); | |
4974 | else | |
4975 | init = NULL_TREE; | |
4976 | ||
4977 | finish_static_data_member_decl (r, init, | |
4978 | /*asmspec_tree=*/NULL_TREE, | |
fa8d6e85 MM |
4979 | /*flags=*/0); |
4980 | ||
6ba89f8e MM |
4981 | if (DECL_DEFINED_IN_CLASS_P (r)) |
4982 | check_static_variable_definition (r, TREE_TYPE (r)); | |
5566b478 | 4983 | } |
61a127b3 MM |
4984 | |
4985 | /* R will have a TREE_CHAIN if and only if it has already been | |
4986 | processed by finish_member_declaration. This can happen | |
4987 | if, for example, it is a TYPE_DECL for a class-scoped | |
4988 | ENUMERAL_TYPE; such a thing will already have been added to | |
4989 | the field list by tsubst_enum above. */ | |
4990 | if (!TREE_CHAIN (r)) | |
4991 | { | |
4992 | set_current_access_from_decl (r); | |
4993 | finish_member_declaration (r); | |
4994 | } | |
5566b478 | 4995 | } |
8d08fdba | 4996 | |
61a127b3 MM |
4997 | /* Set up the list (TYPE_METHODS) and vector (CLASSTYPE_METHOD_VEC) |
4998 | for this instantiation. */ | |
4999 | for (t = TYPE_METHODS (pattern); t; t = TREE_CHAIN (t)) | |
5000 | { | |
4393e105 | 5001 | tree r = tsubst (t, args, /*complain=*/1, NULL_TREE); |
61a127b3 MM |
5002 | set_current_access_from_decl (r); |
5003 | finish_member_declaration (r); | |
5004 | } | |
8d08fdba | 5005 | |
2604412d JM |
5006 | /* Construct the DECL_FRIENDLIST for the new class type. */ |
5007 | typedecl = TYPE_MAIN_DECL (type); | |
5008 | for (t = DECL_FRIENDLIST (TYPE_MAIN_DECL (pattern)); | |
5009 | t != NULL_TREE; | |
5010 | t = TREE_CHAIN (t)) | |
f84b4be9 | 5011 | { |
2604412d | 5012 | tree friends; |
f84b4be9 | 5013 | |
2604412d JM |
5014 | for (friends = TREE_VALUE (t); |
5015 | friends != NULL_TREE; | |
5016 | friends = TREE_CHAIN (friends)) | |
0c0aac2f MM |
5017 | if (TREE_PURPOSE (friends) == error_mark_node) |
5018 | add_friend (type, | |
5019 | tsubst_friend_function (TREE_VALUE (friends), | |
5020 | args)); | |
5021 | else | |
4f1c5b7d | 5022 | my_friendly_abort (20000216); |
2604412d | 5023 | } |
5566b478 | 5024 | |
6757edfe MM |
5025 | for (t = CLASSTYPE_FRIEND_CLASSES (pattern); |
5026 | t != NULL_TREE; | |
5027 | t = TREE_CHAIN (t)) | |
5028 | { | |
5029 | tree friend_type = TREE_VALUE (t); | |
1aed5355 | 5030 | tree new_friend_type; |
6757edfe | 5031 | |
36a117a5 MM |
5032 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
5033 | new_friend_type = tsubst_friend_class (friend_type, args); | |
5034 | else if (uses_template_parms (friend_type)) | |
4393e105 MM |
5035 | new_friend_type = tsubst (friend_type, args, /*complain=*/1, |
5036 | NULL_TREE); | |
36a117a5 | 5037 | else |
61fc8c9e MM |
5038 | { |
5039 | tree ns = decl_namespace_context (TYPE_MAIN_DECL (friend_type)); | |
36a117a5 | 5040 | |
61fc8c9e MM |
5041 | /* The call to xref_tag_from_type does injection for friend |
5042 | classes. */ | |
5043 | push_nested_namespace (ns); | |
5044 | new_friend_type = | |
5045 | xref_tag_from_type (friend_type, NULL_TREE, 1); | |
5046 | pop_nested_namespace (ns); | |
5047 | } | |
1aed5355 MM |
5048 | |
5049 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) | |
5050 | /* Trick make_friend_class into realizing that the friend | |
5051 | we're adding is a template, not an ordinary class. It's | |
5052 | important that we use make_friend_class since it will | |
5053 | perform some error-checking and output cross-reference | |
5054 | information. */ | |
5055 | ++processing_template_decl; | |
5056 | ||
5057 | make_friend_class (type, new_friend_type); | |
fc378698 | 5058 | |
1aed5355 MM |
5059 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
5060 | --processing_template_decl; | |
6757edfe | 5061 | } |
fc378698 | 5062 | |
2604412d JM |
5063 | for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t)) |
5064 | if (TREE_CODE (t) == FIELD_DECL) | |
5065 | { | |
5066 | TREE_TYPE (t) = complete_type (TREE_TYPE (t)); | |
5067 | require_complete_type (t); | |
5068 | } | |
5566b478 | 5069 | |
61a127b3 MM |
5070 | /* Set the file and line number information to whatever is given for |
5071 | the class itself. This puts error messages involving generated | |
5072 | implicit functions at a predictable point, and the same point | |
5073 | that would be used for non-template classes. */ | |
5074 | lineno = DECL_SOURCE_LINE (typedecl); | |
5075 | input_filename = DECL_SOURCE_FILE (typedecl); | |
5076 | ||
5077 | unreverse_member_declarations (type); | |
9f33663b | 5078 | finish_struct_1 (type); |
2604412d | 5079 | CLASSTYPE_GOT_SEMICOLON (type) = 1; |
e92cc029 | 5080 | |
5524676d JM |
5081 | /* Clear this now so repo_template_used is happy. */ |
5082 | TYPE_BEING_DEFINED (type) = 0; | |
2604412d | 5083 | repo_template_used (type); |
8d08fdba | 5084 | |
9188c363 MM |
5085 | /* Now that the class is complete, instantiate default arguments for |
5086 | any member functions. We don't do this earlier because the | |
5087 | default arguments may reference members of the class. */ | |
5088 | if (!PRIMARY_TEMPLATE_P (template)) | |
5089 | for (t = TYPE_METHODS (type); t; t = TREE_CHAIN (t)) | |
5090 | if (TREE_CODE (t) == FUNCTION_DECL | |
5091 | /* Implicitly generated member functions will not have tmplate | |
5092 | information; they are not instantiations, but instead are | |
5093 | created "fresh" for each instantiation. */ | |
5094 | && DECL_TEMPLATE_INFO (t)) | |
5095 | tsubst_default_arguments (t); | |
5096 | ||
b74a0560 | 5097 | popclass (); |
5566b478 MS |
5098 | pop_from_top_level (); |
5099 | pop_tinst_level (); | |
5100 | ||
5101 | return type; | |
8d08fdba MS |
5102 | } |
5103 | ||
5104 | static int | |
5105 | list_eq (t1, t2) | |
5106 | tree t1, t2; | |
5107 | { | |
5108 | if (t1 == NULL_TREE) | |
5109 | return t2 == NULL_TREE; | |
5110 | if (t2 == NULL_TREE) | |
5111 | return 0; | |
5112 | /* Don't care if one declares its arg const and the other doesn't -- the | |
5113 | main variant of the arg type is all that matters. */ | |
5114 | if (TYPE_MAIN_VARIANT (TREE_VALUE (t1)) | |
5115 | != TYPE_MAIN_VARIANT (TREE_VALUE (t2))) | |
5116 | return 0; | |
5117 | return list_eq (TREE_CHAIN (t1), TREE_CHAIN (t2)); | |
5118 | } | |
5119 | ||
00d3396f JM |
5120 | /* If arg is a non-type template parameter that does not depend on template |
5121 | arguments, fold it like we weren't in the body of a template. */ | |
5122 | ||
5123 | static tree | |
5124 | maybe_fold_nontype_arg (arg) | |
5125 | tree arg; | |
5126 | { | |
7610f2ce JM |
5127 | /* If we're not in a template, ARG is already as simple as it's going to |
5128 | get, and trying to reprocess the trees will break. */ | |
5129 | if (! processing_template_decl) | |
5130 | return arg; | |
5131 | ||
2f939d94 | 5132 | if (!TYPE_P (arg) && !uses_template_parms (arg)) |
00d3396f JM |
5133 | { |
5134 | /* Sometimes, one of the args was an expression involving a | |
5135 | template constant parameter, like N - 1. Now that we've | |
5136 | tsubst'd, we might have something like 2 - 1. This will | |
5137 | confuse lookup_template_class, so we do constant folding | |
5138 | here. We have to unset processing_template_decl, to | |
5139 | fool build_expr_from_tree() into building an actual | |
5140 | tree. */ | |
5141 | ||
5142 | int saved_processing_template_decl = processing_template_decl; | |
5143 | processing_template_decl = 0; | |
5144 | arg = fold (build_expr_from_tree (arg)); | |
5145 | processing_template_decl = saved_processing_template_decl; | |
5146 | } | |
5147 | return arg; | |
5148 | } | |
5149 | ||
a221d52f | 5150 | /* Return the TREE_VEC with the arguments for the innermost template header, |
36a117a5 MM |
5151 | where ARGS is either that or the VEC of VECs for all the |
5152 | arguments. */ | |
a221d52f JM |
5153 | |
5154 | tree | |
36a117a5 | 5155 | innermost_args (args) |
a221d52f | 5156 | tree args; |
a221d52f | 5157 | { |
36a117a5 | 5158 | return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args)); |
a221d52f | 5159 | } |
f84b4be9 | 5160 | |
830bfa74 MM |
5161 | /* Substitute ARGS into the vector of template arguments T. */ |
5162 | ||
e9659ab0 | 5163 | static tree |
4393e105 | 5164 | tsubst_template_arg_vector (t, args, complain) |
830bfa74 MM |
5165 | tree t; |
5166 | tree args; | |
4393e105 | 5167 | int complain; |
830bfa74 MM |
5168 | { |
5169 | int len = TREE_VEC_LENGTH (t), need_new = 0, i; | |
5170 | tree *elts = (tree *) alloca (len * sizeof (tree)); | |
5171 | ||
5172 | bzero ((char *) elts, len * sizeof (tree)); | |
5173 | ||
5174 | for (i = 0; i < len; i++) | |
5175 | { | |
5176 | if (TREE_VEC_ELT (t, i) != NULL_TREE | |
5177 | && TREE_CODE (TREE_VEC_ELT (t, i)) == TREE_VEC) | |
4393e105 MM |
5178 | elts[i] = tsubst_template_arg_vector (TREE_VEC_ELT (t, i), |
5179 | args, complain); | |
830bfa74 MM |
5180 | else |
5181 | elts[i] = maybe_fold_nontype_arg | |
4393e105 MM |
5182 | (tsubst_expr (TREE_VEC_ELT (t, i), args, complain, |
5183 | NULL_TREE)); | |
830bfa74 MM |
5184 | |
5185 | if (elts[i] != TREE_VEC_ELT (t, i)) | |
5186 | need_new = 1; | |
5187 | } | |
5188 | ||
5189 | if (!need_new) | |
5190 | return t; | |
5191 | ||
f31c0a32 | 5192 | t = make_tree_vec (len); |
830bfa74 MM |
5193 | for (i = 0; i < len; i++) |
5194 | TREE_VEC_ELT (t, i) = elts[i]; | |
5195 | ||
5196 | return t; | |
5197 | } | |
5198 | ||
36a117a5 MM |
5199 | /* Return the result of substituting ARGS into the template parameters |
5200 | given by PARMS. If there are m levels of ARGS and m + n levels of | |
5201 | PARMS, then the result will contain n levels of PARMS. For | |
5202 | example, if PARMS is `template <class T> template <class U> | |
5203 | template <T*, U, class V>' and ARGS is {{int}, {double}} then the | |
5204 | result will be `template <int*, double, class V>'. */ | |
5205 | ||
e9659ab0 | 5206 | static tree |
4393e105 | 5207 | tsubst_template_parms (parms, args, complain) |
36a117a5 MM |
5208 | tree parms; |
5209 | tree args; | |
4393e105 | 5210 | int complain; |
36a117a5 | 5211 | { |
f71f87f9 MM |
5212 | tree r = NULL_TREE; |
5213 | tree* new_parms; | |
36a117a5 MM |
5214 | |
5215 | for (new_parms = &r; | |
5216 | TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args); | |
5217 | new_parms = &(TREE_CHAIN (*new_parms)), | |
5218 | parms = TREE_CHAIN (parms)) | |
5219 | { | |
5220 | tree new_vec = | |
5221 | make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms))); | |
5222 | int i; | |
5223 | ||
5224 | for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i) | |
5225 | { | |
5226 | tree default_value = | |
5227 | TREE_PURPOSE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
5228 | tree parm_decl = | |
5229 | TREE_VALUE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
5230 | ||
5231 | TREE_VEC_ELT (new_vec, i) | |
4393e105 MM |
5232 | = build_tree_list (tsubst (default_value, args, complain, |
5233 | NULL_TREE), | |
5234 | tsubst (parm_decl, args, complain, | |
5235 | NULL_TREE)); | |
36a117a5 MM |
5236 | } |
5237 | ||
5238 | *new_parms = | |
5239 | tree_cons (build_int_2 (0, (TMPL_PARMS_DEPTH (parms) | |
5240 | - TMPL_ARGS_DEPTH (args))), | |
5241 | new_vec, NULL_TREE); | |
5242 | } | |
5243 | ||
5244 | return r; | |
5245 | } | |
5246 | ||
ed44da02 MM |
5247 | /* Substitute the ARGS into the indicated aggregate (or enumeration) |
5248 | type T. If T is not an aggregate or enumeration type, it is | |
5249 | handled as if by tsubst. IN_DECL is as for tsubst. If | |
5250 | ENTERING_SCOPE is non-zero, T is the context for a template which | |
5251 | we are presently tsubst'ing. Return the subsituted value. */ | |
36a117a5 | 5252 | |
e9659ab0 | 5253 | static tree |
4393e105 | 5254 | tsubst_aggr_type (t, args, complain, in_decl, entering_scope) |
36a117a5 MM |
5255 | tree t; |
5256 | tree args; | |
4393e105 | 5257 | int complain; |
36a117a5 MM |
5258 | tree in_decl; |
5259 | int entering_scope; | |
5260 | { | |
5261 | if (t == NULL_TREE) | |
5262 | return NULL_TREE; | |
5263 | ||
5264 | switch (TREE_CODE (t)) | |
5265 | { | |
5266 | case RECORD_TYPE: | |
5267 | if (TYPE_PTRMEMFUNC_P (t)) | |
5268 | { | |
5269 | tree r = build_ptrmemfunc_type | |
4393e105 | 5270 | (tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl)); |
adecb3f4 MM |
5271 | return cp_build_qualified_type_real (r, TYPE_QUALS (t), |
5272 | complain); | |
36a117a5 MM |
5273 | } |
5274 | ||
5275 | /* else fall through */ | |
ed44da02 | 5276 | case ENUMERAL_TYPE: |
36a117a5 | 5277 | case UNION_TYPE: |
5db698f6 | 5278 | if (TYPE_TEMPLATE_INFO (t)) |
36a117a5 MM |
5279 | { |
5280 | tree argvec; | |
5281 | tree context; | |
5282 | tree r; | |
5283 | ||
5284 | /* First, determine the context for the type we are looking | |
5285 | up. */ | |
5286 | if (TYPE_CONTEXT (t) != NULL_TREE) | |
5287 | context = tsubst_aggr_type (TYPE_CONTEXT (t), args, | |
4393e105 | 5288 | complain, |
36a117a5 MM |
5289 | in_decl, /*entering_scope=*/1); |
5290 | else | |
5291 | context = NULL_TREE; | |
5292 | ||
5293 | /* Then, figure out what arguments are appropriate for the | |
5294 | type we are trying to find. For example, given: | |
5295 | ||
5296 | template <class T> struct S; | |
5297 | template <class T, class U> void f(T, U) { S<U> su; } | |
5298 | ||
5299 | and supposing that we are instantiating f<int, double>, | |
5300 | then our ARGS will be {int, double}, but, when looking up | |
5301 | S we only want {double}. */ | |
4393e105 MM |
5302 | argvec = tsubst_template_arg_vector (TYPE_TI_ARGS (t), args, |
5303 | complain); | |
36a117a5 MM |
5304 | |
5305 | r = lookup_template_class (t, argvec, in_decl, context, | |
5306 | entering_scope); | |
5307 | ||
adecb3f4 MM |
5308 | return cp_build_qualified_type_real (r, TYPE_QUALS (t), |
5309 | complain); | |
36a117a5 MM |
5310 | } |
5311 | else | |
5312 | /* This is not a template type, so there's nothing to do. */ | |
5313 | return t; | |
5314 | ||
5315 | default: | |
4393e105 | 5316 | return tsubst (t, args, complain, in_decl); |
36a117a5 MM |
5317 | } |
5318 | } | |
5319 | ||
9188c363 MM |
5320 | /* Substitute into the default argument ARG (a default argument for |
5321 | FN), which has the indicated TYPE. */ | |
5322 | ||
5323 | tree | |
5324 | tsubst_default_argument (fn, type, arg) | |
5325 | tree fn; | |
5326 | tree type; | |
5327 | tree arg; | |
5328 | { | |
5329 | /* This default argument came from a template. Instantiate the | |
5330 | default argument here, not in tsubst. In the case of | |
5331 | something like: | |
5332 | ||
5333 | template <class T> | |
5334 | struct S { | |
5335 | static T t(); | |
5336 | void f(T = t()); | |
5337 | }; | |
5338 | ||
5339 | we must be careful to do name lookup in the scope of S<T>, | |
5340 | rather than in the current class. */ | |
5341 | if (DECL_CLASS_SCOPE_P (fn)) | |
4f1c5b7d | 5342 | pushclass (DECL_CONTEXT (fn), 2); |
9188c363 MM |
5343 | |
5344 | arg = tsubst_expr (arg, DECL_TI_ARGS (fn), /*complain=*/1, NULL_TREE); | |
5345 | ||
5346 | if (DECL_CLASS_SCOPE_P (fn)) | |
5347 | popclass (); | |
5348 | ||
5349 | /* Make sure the default argument is reasonable. */ | |
5350 | arg = check_default_argument (type, arg); | |
5351 | ||
5352 | return arg; | |
5353 | } | |
5354 | ||
5355 | /* Substitute into all the default arguments for FN. */ | |
5356 | ||
5357 | static void | |
5358 | tsubst_default_arguments (fn) | |
5359 | tree fn; | |
5360 | { | |
5361 | tree arg; | |
5362 | tree tmpl_args; | |
5363 | ||
5364 | tmpl_args = DECL_TI_ARGS (fn); | |
5365 | ||
5366 | /* If this function is not yet instantiated, we certainly don't need | |
5367 | its default arguments. */ | |
5368 | if (uses_template_parms (tmpl_args)) | |
5369 | return; | |
5370 | ||
5371 | for (arg = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
5372 | arg; | |
5373 | arg = TREE_CHAIN (arg)) | |
5374 | if (TREE_PURPOSE (arg)) | |
5375 | TREE_PURPOSE (arg) = tsubst_default_argument (fn, | |
5376 | TREE_VALUE (arg), | |
5377 | TREE_PURPOSE (arg)); | |
5378 | } | |
5379 | ||
ae58fa02 MM |
5380 | /* Substitute the ARGS into the T, which is a _DECL. TYPE is the |
5381 | (already computed) substitution of ARGS into TREE_TYPE (T), if | |
5382 | appropriate. Return the result of the substitution. IN_DECL is as | |
5383 | for tsubst. */ | |
00d3396f | 5384 | |
e9659ab0 | 5385 | static tree |
ae58fa02 MM |
5386 | tsubst_decl (t, args, type, in_decl) |
5387 | tree t; | |
5388 | tree args; | |
5389 | tree type; | |
8d08fdba MS |
5390 | tree in_decl; |
5391 | { | |
ae58fa02 MM |
5392 | int saved_lineno; |
5393 | char* saved_filename; | |
b370501f | 5394 | tree r = NULL_TREE; |
830bfa74 | 5395 | |
ae58fa02 MM |
5396 | /* Set the filename and linenumber to improve error-reporting. */ |
5397 | saved_lineno = lineno; | |
5398 | saved_filename = input_filename; | |
5399 | lineno = DECL_SOURCE_LINE (t); | |
5400 | input_filename = DECL_SOURCE_FILE (t); | |
b7484fbe | 5401 | |
8d08fdba MS |
5402 | switch (TREE_CODE (t)) |
5403 | { | |
98c1c668 JM |
5404 | case TEMPLATE_DECL: |
5405 | { | |
5406 | /* We can get here when processing a member template function | |
5407 | of a template class. */ | |
98c1c668 | 5408 | tree decl = DECL_TEMPLATE_RESULT (t); |
386b8a85 | 5409 | tree spec; |
db2767b6 | 5410 | int is_template_template_parm = DECL_TEMPLATE_TEMPLATE_PARM_P (t); |
98c1c668 | 5411 | |
db2767b6 MM |
5412 | if (!is_template_template_parm) |
5413 | { | |
36a117a5 MM |
5414 | /* We might already have an instance of this template. |
5415 | The ARGS are for the surrounding class type, so the | |
5416 | full args contain the tsubst'd args for the context, | |
5417 | plus the innermost args from the template decl. */ | |
5418 | tree tmpl_args = DECL_CLASS_TEMPLATE_P (t) | |
5419 | ? CLASSTYPE_TI_ARGS (TREE_TYPE (t)) | |
17aec3eb | 5420 | : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t)); |
7ddedda4 MM |
5421 | tree full_args; |
5422 | ||
4393e105 MM |
5423 | full_args = tsubst_template_arg_vector (tmpl_args, args, |
5424 | /*complain=*/1); | |
36a117a5 MM |
5425 | |
5426 | /* tsubst_template_arg_vector doesn't copy the vector if | |
5427 | nothing changed. But, *something* should have | |
5428 | changed. */ | |
5429 | my_friendly_assert (full_args != tmpl_args, 0); | |
5430 | ||
5431 | spec = retrieve_specialization (t, full_args); | |
db2767b6 | 5432 | if (spec != NULL_TREE) |
ae58fa02 MM |
5433 | { |
5434 | r = spec; | |
5435 | break; | |
5436 | } | |
db2767b6 | 5437 | } |
98c1c668 JM |
5438 | |
5439 | /* Make a new template decl. It will be similar to the | |
5440 | original, but will record the current template arguments. | |
5441 | We also create a new function declaration, which is just | |
5442 | like the old one, but points to this new template, rather | |
5443 | than the old one. */ | |
0acf7199 | 5444 | r = copy_decl (t); |
ae58fa02 MM |
5445 | my_friendly_assert (DECL_LANG_SPECIFIC (r) != 0, 0); |
5446 | TREE_CHAIN (r) = NULL_TREE; | |
db2767b6 MM |
5447 | |
5448 | if (is_template_template_parm) | |
5449 | { | |
4393e105 | 5450 | tree new_decl = tsubst (decl, args, /*complain=*/1, in_decl); |
17aec3eb | 5451 | DECL_TEMPLATE_RESULT (r) = new_decl; |
ae58fa02 MM |
5452 | TREE_TYPE (r) = TREE_TYPE (new_decl); |
5453 | break; | |
db2767b6 MM |
5454 | } |
5455 | ||
ae58fa02 | 5456 | DECL_CONTEXT (r) |
4f1c5b7d | 5457 | = tsubst_aggr_type (DECL_CONTEXT (t), args, |
4393e105 MM |
5458 | /*complain=*/1, in_decl, |
5459 | /*entering_scope=*/1); | |
4f1c5b7d MM |
5460 | DECL_VIRTUAL_CONTEXT (r) |
5461 | = tsubst_aggr_type (DECL_VIRTUAL_CONTEXT (t), args, | |
5462 | /*complain=*/1, in_decl, | |
5463 | /*entering_scope=*/1); | |
ae58fa02 | 5464 | DECL_TEMPLATE_INFO (r) = build_tree_list (t, args); |
93cdc044 JM |
5465 | |
5466 | if (TREE_CODE (decl) == TYPE_DECL) | |
5467 | { | |
4393e105 MM |
5468 | tree new_type = tsubst (TREE_TYPE (t), args, |
5469 | /*complain=*/1, in_decl); | |
ae58fa02 MM |
5470 | TREE_TYPE (r) = new_type; |
5471 | CLASSTYPE_TI_TEMPLATE (new_type) = r; | |
17aec3eb | 5472 | DECL_TEMPLATE_RESULT (r) = TYPE_MAIN_DECL (new_type); |
ae58fa02 | 5473 | DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type); |
93cdc044 JM |
5474 | } |
5475 | else | |
5476 | { | |
4393e105 | 5477 | tree new_decl = tsubst (decl, args, /*complain=*/1, in_decl); |
17aec3eb RK |
5478 | |
5479 | DECL_TEMPLATE_RESULT (r) = new_decl; | |
ae58fa02 MM |
5480 | DECL_TI_TEMPLATE (new_decl) = r; |
5481 | TREE_TYPE (r) = TREE_TYPE (new_decl); | |
5482 | DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl); | |
93cdc044 JM |
5483 | } |
5484 | ||
ae58fa02 MM |
5485 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
5486 | DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE; | |
5487 | DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE; | |
98c1c668 JM |
5488 | |
5489 | /* The template parameters for this new template are all the | |
5490 | template parameters for the old template, except the | |
5491 | outermost level of parameters. */ | |
ae58fa02 | 5492 | DECL_TEMPLATE_PARMS (r) |
4393e105 MM |
5493 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args, |
5494 | /*complain=*/1); | |
98c1c668 | 5495 | |
93cdc044 | 5496 | if (PRIMARY_TEMPLATE_P (t)) |
ae58fa02 | 5497 | DECL_PRIMARY_TEMPLATE (r) = r; |
93cdc044 | 5498 | |
8d019cef | 5499 | /* We don't partially instantiate partial specializations. */ |
93cdc044 | 5500 | if (TREE_CODE (decl) == TYPE_DECL) |
ae58fa02 | 5501 | break; |
93cdc044 | 5502 | |
75650646 MM |
5503 | for (spec = DECL_TEMPLATE_SPECIALIZATIONS (t); |
5504 | spec != NULL_TREE; | |
5505 | spec = TREE_CHAIN (spec)) | |
5506 | { | |
5507 | /* It helps to consider example here. Consider: | |
5508 | ||
5509 | template <class T> | |
5510 | struct S { | |
5511 | template <class U> | |
5512 | void f(U u); | |
5513 | ||
5514 | template <> | |
5515 | void f(T* t) {} | |
5516 | }; | |
5517 | ||
5518 | Now, for example, we are instantiating S<int>::f(U u). | |
5519 | We want to make a template: | |
5520 | ||
5521 | template <class U> | |
5522 | void S<int>::f(U); | |
5523 | ||
5524 | It will have a specialization, for the case U = int*, of | |
5525 | the form: | |
5526 | ||
5527 | template <> | |
5528 | void S<int>::f<int*>(int*); | |
5529 | ||
5530 | This specialization will be an instantiation of | |
5531 | the specialization given in the declaration of S, with | |
5532 | argument list int*. */ | |
5533 | ||
5534 | tree fn = TREE_VALUE (spec); | |
5535 | tree spec_args; | |
5536 | tree new_fn; | |
5537 | ||
5538 | if (!DECL_TEMPLATE_SPECIALIZATION (fn)) | |
5539 | /* Instantiations are on the same list, but they're of | |
5540 | no concern to us. */ | |
5541 | continue; | |
5542 | ||
36a117a5 MM |
5543 | if (TREE_CODE (fn) != TEMPLATE_DECL) |
5544 | /* A full specialization. There's no need to record | |
5545 | that here. */ | |
5546 | continue; | |
5547 | ||
4393e105 MM |
5548 | spec_args = tsubst (DECL_TI_ARGS (fn), args, |
5549 | /*complain=*/1, in_decl); | |
17aec3eb RK |
5550 | new_fn |
5551 | = tsubst (DECL_TEMPLATE_RESULT (most_general_template (fn)), | |
5552 | spec_args, /*complain=*/1, in_decl); | |
36a117a5 | 5553 | DECL_TI_TEMPLATE (new_fn) = fn; |
ae58fa02 | 5554 | register_specialization (new_fn, r, |
36a117a5 | 5555 | innermost_args (spec_args)); |
75650646 MM |
5556 | } |
5557 | ||
5558 | /* Record this partial instantiation. */ | |
ae58fa02 | 5559 | register_specialization (r, t, |
17aec3eb | 5560 | DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r))); |
75650646 | 5561 | |
98c1c668 | 5562 | } |
ae58fa02 | 5563 | break; |
8d08fdba MS |
5564 | |
5565 | case FUNCTION_DECL: | |
5566 | { | |
386b8a85 | 5567 | tree ctx; |
87603ed0 | 5568 | tree argvec = NULL_TREE; |
cf38f48a | 5569 | tree *friends; |
36a117a5 | 5570 | tree gen_tmpl; |
5566b478 | 5571 | int member; |
d8c4447d MM |
5572 | int args_depth; |
5573 | int parms_depth; | |
5566b478 | 5574 | |
36a117a5 MM |
5575 | /* Nobody should be tsubst'ing into non-template functions. */ |
5576 | my_friendly_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE, 0); | |
5577 | ||
5578 | if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL) | |
5579 | { | |
5580 | tree spec; | |
5581 | ||
5582 | /* Calculate the most general template of which R is a | |
5583 | specialization, and the complete set of arguments used to | |
5584 | specialize R. */ | |
5585 | gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t)); | |
7ddedda4 MM |
5586 | argvec |
5587 | = tsubst_template_arg_vector (DECL_TI_ARGS | |
5588 | (DECL_TEMPLATE_RESULT (gen_tmpl)), | |
4393e105 | 5589 | args, /*complain=*/1); |
36a117a5 MM |
5590 | |
5591 | /* Check to see if we already have this specialization. */ | |
5592 | spec = retrieve_specialization (gen_tmpl, argvec); | |
7ddedda4 | 5593 | |
36a117a5 | 5594 | if (spec) |
ae58fa02 MM |
5595 | { |
5596 | r = spec; | |
5597 | break; | |
5598 | } | |
d8c4447d MM |
5599 | |
5600 | /* Here, we deal with the peculiar case: | |
5601 | ||
5602 | template <class T> struct S { | |
5603 | template <class U> friend void f(); | |
5604 | }; | |
74b846e0 | 5605 | template <class U> void f() {} |
d8c4447d MM |
5606 | template S<int>; |
5607 | template void f<double>(); | |
5608 | ||
5609 | Here, the ARGS for the instantiation of will be {int, | |
5610 | double}. But, we only need as many ARGS as there are | |
5611 | levels of template parameters in CODE_PATTERN. We are | |
5612 | careful not to get fooled into reducing the ARGS in | |
5613 | situations like: | |
5614 | ||
5615 | template <class T> struct S { template <class U> void f(U); } | |
5616 | template <class T> template <> void S<T>::f(int) {} | |
5617 | ||
5618 | which we can spot because the pattern will be a | |
5619 | specialization in this case. */ | |
5620 | args_depth = TMPL_ARGS_DEPTH (args); | |
5621 | parms_depth = | |
5622 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t))); | |
5623 | if (args_depth > parms_depth | |
5624 | && !DECL_TEMPLATE_SPECIALIZATION (t)) | |
5625 | { | |
5626 | my_friendly_assert (DECL_FRIEND_P (t), 0); | |
5627 | ||
5628 | if (parms_depth > 1) | |
5629 | { | |
5630 | int i; | |
5631 | ||
f31c0a32 | 5632 | args = make_tree_vec (parms_depth); |
d8c4447d MM |
5633 | for (i = 0; i < parms_depth; ++i) |
5634 | TREE_VEC_ELT (args, i) = | |
5635 | TREE_VEC_ELT (args, i + (args_depth - parms_depth)); | |
5636 | } | |
5637 | else | |
5638 | args = TREE_VEC_ELT (args, args_depth - parms_depth); | |
5639 | } | |
36a117a5 MM |
5640 | } |
5641 | else | |
5642 | { | |
5643 | /* This special case arises when we have something like this: | |
5644 | ||
5645 | template <class T> struct S { | |
5646 | friend void f<int>(int, double); | |
5647 | }; | |
5648 | ||
5649 | Here, the DECL_TI_TEMPLATE for the friend declaration | |
39c01e4c MM |
5650 | will be a LOOKUP_EXPR or an IDENTIFIER_NODE. We are |
5651 | being called from tsubst_friend_function, and we want | |
5652 | only to create a new decl (R) with appropriate types so | |
5653 | that we can call determine_specialization. */ | |
5654 | my_friendly_assert ((TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5655 | == LOOKUP_EXPR) | |
5656 | || (TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5657 | == IDENTIFIER_NODE), 0); | |
36a117a5 MM |
5658 | gen_tmpl = NULL_TREE; |
5659 | } | |
5660 | ||
6eb3bb27 | 5661 | if (DECL_CLASS_SCOPE_P (t)) |
8d08fdba | 5662 | { |
5566b478 MS |
5663 | if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t))) |
5664 | member = 2; | |
5665 | else | |
5666 | member = 1; | |
4f1c5b7d | 5667 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
4393e105 | 5668 | /*complain=*/1, t, |
36a117a5 | 5669 | /*entering_scope=*/1); |
5566b478 MS |
5670 | } |
5671 | else | |
5672 | { | |
5673 | member = 0; | |
4f1c5b7d | 5674 | ctx = DECL_CONTEXT (t); |
5566b478 | 5675 | } |
4393e105 | 5676 | type = tsubst (type, args, /*complain=*/1, in_decl); |
b3da7bb1 MM |
5677 | if (type == error_mark_node) |
5678 | return error_mark_node; | |
8d08fdba | 5679 | |
5566b478 MS |
5680 | /* We do NOT check for matching decls pushed separately at this |
5681 | point, as they may not represent instantiations of this | |
5682 | template, and in any case are considered separate under the | |
312e7d50 | 5683 | discrete model. Instead, see add_maybe_template. */ |
0acf7199 | 5684 | r = copy_decl (t); |
e1467ff2 | 5685 | DECL_USE_TEMPLATE (r) = 0; |
5566b478 MS |
5686 | TREE_TYPE (r) = type; |
5687 | ||
4f1c5b7d MM |
5688 | DECL_CONTEXT (r) = ctx; |
5689 | DECL_VIRTUAL_CONTEXT (r) | |
5690 | = tsubst_aggr_type (DECL_VIRTUAL_CONTEXT (t), args, | |
5691 | /*complain=*/1, t, | |
4393e105 | 5692 | /*entering_scope=*/1); |
5566b478 | 5693 | |
4c571114 | 5694 | if (member && IDENTIFIER_TYPENAME_P (DECL_NAME (r))) |
f181d4ae MM |
5695 | /* Type-conversion operator. Reconstruct the name, in |
5696 | case it's the name of one of the template's parameters. */ | |
5697 | DECL_NAME (r) = build_typename_overload (TREE_TYPE (type)); | |
5566b478 | 5698 | |
4393e105 MM |
5699 | DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args, |
5700 | /*complain=*/1, t); | |
17aec3eb | 5701 | DECL_TEMPLATE_RESULT (r) = NULL_TREE; |
711734a9 JM |
5702 | |
5703 | TREE_STATIC (r) = 0; | |
5704 | TREE_PUBLIC (r) = TREE_PUBLIC (t); | |
5705 | DECL_EXTERNAL (r) = 1; | |
5706 | DECL_INTERFACE_KNOWN (r) = 0; | |
5707 | DECL_DEFER_OUTPUT (r) = 0; | |
5708 | TREE_CHAIN (r) = NULL_TREE; | |
5709 | DECL_PENDING_INLINE_INFO (r) = 0; | |
59026e79 | 5710 | DECL_PENDING_INLINE_P (r) = 0; |
711734a9 | 5711 | TREE_USED (r) = 0; |
db9b2174 MM |
5712 | if (DECL_CLONED_FUNCTION (r)) |
5713 | { | |
5714 | DECL_CLONED_FUNCTION (r) = tsubst (DECL_CLONED_FUNCTION (t), | |
5715 | args, /*complain=*/1, t); | |
5716 | TREE_CHAIN (r) = TREE_CHAIN (DECL_CLONED_FUNCTION (r)); | |
5717 | TREE_CHAIN (DECL_CLONED_FUNCTION (r)) = r; | |
5718 | } | |
711734a9 | 5719 | |
36a117a5 MM |
5720 | /* Set up the DECL_TEMPLATE_INFO for R and compute its mangled |
5721 | name. There's no need to do this in the special friend | |
5722 | case mentioned above where GEN_TMPL is NULL. */ | |
5723 | if (gen_tmpl) | |
386b8a85 | 5724 | { |
36a117a5 | 5725 | DECL_TEMPLATE_INFO (r) |
e1b3e07d | 5726 | = tree_cons (gen_tmpl, argvec, NULL_TREE); |
36a117a5 MM |
5727 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
5728 | register_specialization (r, gen_tmpl, argvec); | |
5729 | ||
5730 | /* Set the mangled name for R. */ | |
5731 | if (DECL_DESTRUCTOR_P (t)) | |
5732 | DECL_ASSEMBLER_NAME (r) = build_destructor_name (ctx); | |
5733 | else | |
386b8a85 | 5734 | { |
36a117a5 MM |
5735 | /* Instantiations of template functions must be mangled |
5736 | specially, in order to conform to 14.5.5.1 | |
5737 | [temp.over.link]. */ | |
5738 | tree tmpl = DECL_TI_TEMPLATE (t); | |
386b8a85 | 5739 | |
36a117a5 MM |
5740 | /* TMPL will be NULL if this is a specialization of a |
5741 | member function of a template class. */ | |
5742 | if (name_mangling_version < 1 | |
5743 | || tmpl == NULL_TREE | |
5744 | || (member && !is_member_template (tmpl) | |
5745 | && !DECL_TEMPLATE_INFO (tmpl))) | |
5746 | set_mangled_name_for_decl (r); | |
75650646 | 5747 | else |
36a117a5 | 5748 | set_mangled_name_for_template_decl (r); |
386b8a85 | 5749 | } |
36a117a5 MM |
5750 | |
5751 | DECL_RTL (r) = 0; | |
5752 | make_decl_rtl (r, NULL_PTR, 1); | |
5753 | ||
5754 | /* Like grokfndecl. If we don't do this, pushdecl will | |
5755 | mess up our TREE_CHAIN because it doesn't find a | |
5756 | previous decl. Sigh. */ | |
5757 | if (member | |
c36ae80f | 5758 | && ! uses_template_parms (r) |
36a117a5 MM |
5759 | && (IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r)) |
5760 | == NULL_TREE)) | |
5761 | SET_IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r), r); | |
9188c363 MM |
5762 | |
5763 | /* We're not supposed to instantiate default arguments | |
5764 | until they are called, for a template. But, for a | |
5765 | declaration like: | |
5766 | ||
5767 | template <class T> void f () | |
5768 | { extern void g(int i = T()); } | |
5769 | ||
5770 | we should do the substitution when the template is | |
5771 | instantiated. We handle the member function case in | |
5772 | instantiate_class_template since the default arguments | |
5773 | might refer to other members of the class. */ | |
5774 | if (!member | |
5775 | && !PRIMARY_TEMPLATE_P (gen_tmpl) | |
5776 | && !uses_template_parms (argvec)) | |
5777 | tsubst_default_arguments (r); | |
386b8a85 | 5778 | } |
f181d4ae | 5779 | |
cf38f48a MM |
5780 | /* Copy the list of befriending classes. */ |
5781 | for (friends = &DECL_BEFRIENDING_CLASSES (r); | |
5782 | *friends; | |
5783 | friends = &TREE_CHAIN (*friends)) | |
5784 | { | |
5785 | *friends = copy_node (*friends); | |
5786 | TREE_VALUE (*friends) = tsubst (TREE_VALUE (*friends), | |
5787 | args, /*complain=*/1, | |
5788 | in_decl); | |
5789 | } | |
5790 | ||
f181d4ae MM |
5791 | if (DECL_CONSTRUCTOR_P (r)) |
5792 | { | |
5793 | maybe_retrofit_in_chrg (r); | |
5794 | grok_ctor_properties (ctx, r); | |
5795 | } | |
f71f87f9 | 5796 | else if (DECL_OVERLOADED_OPERATOR_P (r)) |
f181d4ae | 5797 | grok_op_properties (r, DECL_VIRTUAL_P (r), DECL_FRIEND_P (r)); |
8d08fdba | 5798 | } |
ae58fa02 | 5799 | break; |
8d08fdba MS |
5800 | |
5801 | case PARM_DECL: | |
5802 | { | |
ae58fa02 | 5803 | r = copy_node (t); |
5566b478 | 5804 | TREE_TYPE (r) = type; |
1b8899d1 MM |
5805 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); |
5806 | ||
db2767b6 MM |
5807 | if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX) |
5808 | DECL_INITIAL (r) = TREE_TYPE (r); | |
5809 | else | |
4393e105 MM |
5810 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args, |
5811 | /*complain=*/1, in_decl); | |
db2767b6 | 5812 | |
5566b478 | 5813 | DECL_CONTEXT (r) = NULL_TREE; |
fa56377d JJ |
5814 | if (PROMOTE_PROTOTYPES |
5815 | && (TREE_CODE (type) == INTEGER_TYPE | |
5816 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
f83b0cb6 JM |
5817 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) |
5818 | DECL_ARG_TYPE (r) = integer_type_node; | |
8d08fdba | 5819 | if (TREE_CHAIN (t)) |
4393e105 MM |
5820 | TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args, |
5821 | /*complain=*/1, TREE_CHAIN (t)); | |
8d08fdba | 5822 | } |
ae58fa02 | 5823 | break; |
8d08fdba | 5824 | |
5566b478 MS |
5825 | case FIELD_DECL: |
5826 | { | |
0acf7199 | 5827 | r = copy_decl (t); |
1b8899d1 MM |
5828 | TREE_TYPE (r) = type; |
5829 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); | |
5830 | ||
5831 | /* We don't have to set DECL_CONTEXT here; it is set by | |
5832 | finish_member_declaration. */ | |
4393e105 MM |
5833 | DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args, |
5834 | /*complain=*/1, in_decl); | |
5566b478 | 5835 | TREE_CHAIN (r) = NULL_TREE; |
4393e105 | 5836 | if (TREE_CODE (type) == VOID_TYPE) |
8251199e | 5837 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5838 | } |
ae58fa02 | 5839 | break; |
5566b478 MS |
5840 | |
5841 | case USING_DECL: | |
5842 | { | |
ae58fa02 | 5843 | r = copy_node (t); |
5566b478 | 5844 | DECL_INITIAL (r) |
4393e105 | 5845 | = tsubst_copy (DECL_INITIAL (t), args, /*complain=*/1, in_decl); |
5566b478 | 5846 | TREE_CHAIN (r) = NULL_TREE; |
5566b478 | 5847 | } |
ae58fa02 | 5848 | break; |
5566b478 | 5849 | |
9188c363 MM |
5850 | case TYPE_DECL: |
5851 | if (DECL_IMPLICIT_TYPEDEF_P (t)) | |
5852 | { | |
5853 | /* For an implicit typedef, we just want the implicit | |
5854 | typedef for the tsubst'd type. We've already got the | |
5855 | tsubst'd type, as TYPE, so we just need it's associated | |
5856 | declaration. */ | |
5857 | r = TYPE_NAME (type); | |
5858 | break; | |
5859 | } | |
6dfbb909 MM |
5860 | else if (TREE_CODE (type) == TEMPLATE_TYPE_PARM |
5861 | || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM) | |
9188c363 MM |
5862 | { |
5863 | /* For a template type parameter, we don't have to do | |
5864 | anything special. */ | |
b9f39201 | 5865 | r = TYPE_NAME (type); |
9188c363 MM |
5866 | break; |
5867 | } | |
5868 | ||
5869 | /* Fall through. */ | |
5870 | ||
5566b478 MS |
5871 | case VAR_DECL: |
5872 | { | |
36a117a5 MM |
5873 | tree argvec; |
5874 | tree gen_tmpl; | |
5875 | tree spec; | |
5876 | tree tmpl; | |
9188c363 | 5877 | tree ctx; |
6dfbb909 | 5878 | int local_p; |
9188c363 | 5879 | |
6dfbb909 MM |
5880 | /* Assume this is a non-local variable. */ |
5881 | local_p = 0; | |
5566b478 | 5882 | |
de96bf57 | 5883 | if (TYPE_P (CP_DECL_CONTEXT (t))) |
9188c363 MM |
5884 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, |
5885 | /*complain=*/1, | |
5886 | in_decl, /*entering_scope=*/1); | |
5887 | else | |
6dfbb909 MM |
5888 | { |
5889 | /* Subsequent calls to pushdecl will fill this in. */ | |
5890 | ctx = NULL_TREE; | |
5891 | if (!DECL_NAMESPACE_SCOPE_P (t)) | |
5892 | local_p = 1; | |
5893 | } | |
9188c363 | 5894 | |
36a117a5 | 5895 | /* Check to see if we already have this specialization. */ |
6dfbb909 MM |
5896 | if (!local_p) |
5897 | { | |
5898 | tmpl = DECL_TI_TEMPLATE (t); | |
5899 | gen_tmpl = most_general_template (tmpl); | |
5900 | argvec = tsubst (DECL_TI_ARGS (t), args, /*complain=*/1, in_decl); | |
5901 | spec = retrieve_specialization (gen_tmpl, argvec); | |
5902 | } | |
9188c363 | 5903 | else |
6dfbb909 | 5904 | spec = retrieve_local_specialization (t); |
9188c363 | 5905 | |
36a117a5 | 5906 | if (spec) |
ae58fa02 MM |
5907 | { |
5908 | r = spec; | |
5909 | break; | |
5910 | } | |
5566b478 | 5911 | |
0acf7199 | 5912 | r = copy_decl (t); |
5566b478 | 5913 | TREE_TYPE (r) = type; |
1b8899d1 | 5914 | c_apply_type_quals_to_decl (CP_TYPE_QUALS (type), r); |
5566b478 | 5915 | DECL_CONTEXT (r) = ctx; |
d11ad92e MS |
5916 | |
5917 | /* Don't try to expand the initializer until someone tries to use | |
5918 | this variable; otherwise we run into circular dependencies. */ | |
5919 | DECL_INITIAL (r) = NULL_TREE; | |
5566b478 | 5920 | DECL_RTL (r) = 0; |
06ceef4e | 5921 | DECL_SIZE (r) = DECL_SIZE_UNIT (r) = 0; |
5566b478 | 5922 | |
f9817201 MM |
5923 | /* For __PRETTY_FUNCTION__ we have to adjust the initializer. */ |
5924 | if (DECL_PRETTY_FUNCTION_P (r)) | |
5925 | { | |
5926 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (t), | |
5927 | args, | |
5928 | /*complain=*/1, | |
5929 | NULL_TREE); | |
5930 | TREE_TYPE (r) = TREE_TYPE (DECL_INITIAL (r)); | |
5931 | } | |
5932 | ||
e0942dcd MM |
5933 | /* Even if the original location is out of scope, the newly |
5934 | substituted one is not. */ | |
5935 | if (TREE_CODE (r) == VAR_DECL) | |
5936 | DECL_DEAD_FOR_LOCAL (r) = 0; | |
5937 | ||
6dfbb909 MM |
5938 | if (!local_p) |
5939 | { | |
5940 | /* A static data member declaration is always marked | |
5941 | external when it is declared in-class, even if an | |
5942 | initializer is present. We mimic the non-template | |
5943 | processing here. */ | |
5944 | DECL_EXTERNAL (r) = 1; | |
fa8d6e85 | 5945 | |
6dfbb909 MM |
5946 | register_specialization (r, gen_tmpl, argvec); |
5947 | DECL_TEMPLATE_INFO (r) = tree_cons (tmpl, argvec, NULL_TREE); | |
5948 | SET_DECL_IMPLICIT_INSTANTIATION (r); | |
5949 | } | |
9188c363 | 5950 | else |
6dfbb909 | 5951 | register_local_specialization (r, t); |
5566b478 | 5952 | |
5566b478 | 5953 | TREE_CHAIN (r) = NULL_TREE; |
9188c363 | 5954 | if (TREE_CODE (r) == VAR_DECL && TREE_CODE (type) == VOID_TYPE) |
8251199e | 5955 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5956 | } |
ae58fa02 | 5957 | break; |
5566b478 | 5958 | |
ae58fa02 MM |
5959 | default: |
5960 | my_friendly_abort (0); | |
5961 | } | |
5962 | ||
5963 | /* Restore the file and line information. */ | |
5964 | lineno = saved_lineno; | |
5965 | input_filename = saved_filename; | |
5966 | ||
5967 | return r; | |
5968 | } | |
5969 | ||
cabc336a MM |
5970 | /* Substitue into the ARG_TYPES of a function type. */ |
5971 | ||
e9659ab0 | 5972 | static tree |
4393e105 | 5973 | tsubst_arg_types (arg_types, args, complain, in_decl) |
cabc336a MM |
5974 | tree arg_types; |
5975 | tree args; | |
4393e105 | 5976 | int complain; |
cabc336a MM |
5977 | tree in_decl; |
5978 | { | |
5979 | tree remaining_arg_types; | |
cabc336a MM |
5980 | tree type; |
5981 | ||
5982 | if (!arg_types || arg_types == void_list_node) | |
5983 | return arg_types; | |
5984 | ||
5985 | remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types), | |
4393e105 MM |
5986 | args, complain, in_decl); |
5987 | if (remaining_arg_types == error_mark_node) | |
5988 | return error_mark_node; | |
5989 | ||
5990 | type = tsubst (TREE_VALUE (arg_types), args, complain, in_decl); | |
5991 | if (type == error_mark_node) | |
5992 | return error_mark_node; | |
cabc336a | 5993 | |
4393e105 MM |
5994 | /* Do array-to-pointer, function-to-pointer conversion, and ignore |
5995 | top-level qualifiers as required. */ | |
5996 | type = TYPE_MAIN_VARIANT (type_decays_to (type)); | |
cabc336a MM |
5997 | |
5998 | /* Note that we do not substitute into default arguments here. The | |
5999 | standard mandates that they be instantiated only when needed, | |
6000 | which is done in build_over_call. */ | |
51632249 JM |
6001 | return hash_tree_cons (TREE_PURPOSE (arg_types), type, |
6002 | remaining_arg_types); | |
cabc336a MM |
6003 | |
6004 | } | |
6005 | ||
4393e105 MM |
6006 | /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does |
6007 | *not* handle the exception-specification for FNTYPE, because the | |
6008 | initial substitution of explicitly provided template parameters | |
6009 | during argument deduction forbids substitution into the | |
6010 | exception-specification: | |
6011 | ||
6012 | [temp.deduct] | |
6013 | ||
6014 | All references in the function type of the function template to the | |
6015 | corresponding template parameters are replaced by the specified tem- | |
6016 | plate argument values. If a substitution in a template parameter or | |
6017 | in the function type of the function template results in an invalid | |
6018 | type, type deduction fails. [Note: The equivalent substitution in | |
6019 | exception specifications is done only when the function is instanti- | |
6020 | ated, at which point a program is ill-formed if the substitution | |
6021 | results in an invalid type.] */ | |
6022 | ||
6023 | static tree | |
6024 | tsubst_function_type (t, args, complain, in_decl) | |
6025 | tree t; | |
6026 | tree args; | |
6027 | int complain; | |
6028 | tree in_decl; | |
6029 | { | |
6030 | tree return_type; | |
6031 | tree arg_types; | |
6032 | tree fntype; | |
6033 | ||
8dd3f57a | 6034 | /* The TYPE_CONTEXT is not used for function/method types. */ |
4393e105 MM |
6035 | my_friendly_assert (TYPE_CONTEXT (t) == NULL_TREE, 0); |
6036 | ||
6037 | /* Substitue the return type. */ | |
6038 | return_type = tsubst (TREE_TYPE (t), args, complain, in_decl); | |
6039 | if (return_type == error_mark_node) | |
6040 | return error_mark_node; | |
6041 | ||
6042 | /* Substitue the argument types. */ | |
6043 | arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args, | |
6044 | complain, in_decl); | |
6045 | if (arg_types == error_mark_node) | |
6046 | return error_mark_node; | |
6047 | ||
6048 | /* Construct a new type node and return it. */ | |
6049 | if (TREE_CODE (t) == FUNCTION_TYPE) | |
6050 | fntype = build_function_type (return_type, arg_types); | |
6051 | else | |
6052 | { | |
6053 | tree r = TREE_TYPE (TREE_VALUE (arg_types)); | |
6054 | if (! IS_AGGR_TYPE (r)) | |
6055 | { | |
6056 | /* [temp.deduct] | |
6057 | ||
6058 | Type deduction may fail for any of the following | |
6059 | reasons: | |
6060 | ||
6061 | -- Attempting to create "pointer to member of T" when T | |
6062 | is not a class type. */ | |
6063 | if (complain) | |
6064 | cp_error ("creating pointer to member function of non-class type `%T'", | |
6065 | r); | |
6066 | return error_mark_node; | |
6067 | } | |
6068 | ||
6069 | fntype = build_cplus_method_type (r, return_type, TREE_CHAIN | |
6070 | (arg_types)); | |
6071 | } | |
6072 | fntype = build_qualified_type (fntype, TYPE_QUALS (t)); | |
ada846eb | 6073 | fntype = build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (t)); |
4393e105 MM |
6074 | |
6075 | return fntype; | |
6076 | } | |
6077 | ||
297e73d8 MM |
6078 | /* Substitute into the PARMS of a call-declarator. */ |
6079 | ||
e9659ab0 | 6080 | static tree |
4393e105 | 6081 | tsubst_call_declarator_parms (parms, args, complain, in_decl) |
297e73d8 MM |
6082 | tree parms; |
6083 | tree args; | |
4393e105 | 6084 | int complain; |
297e73d8 MM |
6085 | tree in_decl; |
6086 | { | |
6087 | tree new_parms; | |
6088 | tree type; | |
6089 | tree defarg; | |
6090 | ||
6091 | if (!parms || parms == void_list_node) | |
6092 | return parms; | |
6093 | ||
6094 | new_parms = tsubst_call_declarator_parms (TREE_CHAIN (parms), | |
4393e105 | 6095 | args, complain, in_decl); |
297e73d8 MM |
6096 | |
6097 | /* Figure out the type of this parameter. */ | |
4393e105 | 6098 | type = tsubst (TREE_VALUE (parms), args, complain, in_decl); |
297e73d8 MM |
6099 | |
6100 | /* Figure out the default argument as well. Note that we use | |
4393e105 MM |
6101 | tsubst_expr since the default argument is really an expression. */ |
6102 | defarg = tsubst_expr (TREE_PURPOSE (parms), args, complain, in_decl); | |
297e73d8 MM |
6103 | |
6104 | /* Chain this parameter on to the front of those we have already | |
6105 | processed. We don't use hash_tree_cons because that function | |
6106 | doesn't check TREE_PARMLIST. */ | |
6107 | new_parms = tree_cons (defarg, type, new_parms); | |
6108 | ||
6109 | /* And note that these are parameters. */ | |
6110 | TREE_PARMLIST (new_parms) = 1; | |
6111 | ||
6112 | return new_parms; | |
6113 | } | |
6114 | ||
4393e105 MM |
6115 | /* Take the tree structure T and replace template parameters used |
6116 | therein with the argument vector ARGS. IN_DECL is an associated | |
6117 | decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE. | |
6118 | An appropriate error message is issued only if COMPLAIN is | |
6119 | non-zero. Note that we must be relatively non-tolerant of | |
6120 | extensions here, in order to preserve conformance; if we allow | |
6121 | substitutions that should not be allowed, we may allow argument | |
6122 | deductions that should not succeed, and therefore report ambiguous | |
6123 | overload situations where there are none. In theory, we could | |
6124 | allow the substitution, but indicate that it should have failed, | |
6125 | and allow our caller to make sure that the right thing happens, but | |
6126 | we don't try to do this yet. | |
6127 | ||
6128 | This function is used for dealing with types, decls and the like; | |
6129 | for expressions, use tsubst_expr or tsubst_copy. */ | |
ae58fa02 MM |
6130 | |
6131 | tree | |
4393e105 | 6132 | tsubst (t, args, complain, in_decl) |
ae58fa02 | 6133 | tree t, args; |
4393e105 | 6134 | int complain; |
ae58fa02 MM |
6135 | tree in_decl; |
6136 | { | |
0ecfe0b4 | 6137 | tree type, r; |
ae58fa02 MM |
6138 | |
6139 | if (t == NULL_TREE || t == error_mark_node | |
6140 | || t == integer_type_node | |
6141 | || t == void_type_node | |
6142 | || t == char_type_node | |
6143 | || TREE_CODE (t) == NAMESPACE_DECL) | |
6144 | return t; | |
6145 | ||
6146 | if (TREE_CODE (t) == IDENTIFIER_NODE) | |
6147 | type = IDENTIFIER_TYPE_VALUE (t); | |
6148 | else | |
6149 | type = TREE_TYPE (t); | |
6150 | if (type == unknown_type_node) | |
6151 | my_friendly_abort (42); | |
6152 | ||
6153 | if (type && TREE_CODE (t) != FUNCTION_DECL | |
6154 | && TREE_CODE (t) != TYPENAME_TYPE | |
6155 | && TREE_CODE (t) != TEMPLATE_DECL | |
4393e105 MM |
6156 | && TREE_CODE (t) != IDENTIFIER_NODE |
6157 | && TREE_CODE (t) != FUNCTION_TYPE | |
6158 | && TREE_CODE (t) != METHOD_TYPE) | |
6159 | type = tsubst (type, args, complain, in_decl); | |
6160 | if (type == error_mark_node) | |
6161 | return error_mark_node; | |
ae58fa02 | 6162 | |
2f939d94 | 6163 | if (DECL_P (t)) |
ae58fa02 MM |
6164 | return tsubst_decl (t, args, type, in_decl); |
6165 | ||
6166 | switch (TREE_CODE (t)) | |
6167 | { | |
6168 | case RECORD_TYPE: | |
6169 | case UNION_TYPE: | |
6170 | case ENUMERAL_TYPE: | |
4393e105 MM |
6171 | return tsubst_aggr_type (t, args, complain, in_decl, |
6172 | /*entering_scope=*/0); | |
ae58fa02 MM |
6173 | |
6174 | case ERROR_MARK: | |
6175 | case IDENTIFIER_NODE: | |
6176 | case OP_IDENTIFIER: | |
6177 | case VOID_TYPE: | |
6178 | case REAL_TYPE: | |
6179 | case COMPLEX_TYPE: | |
6180 | case BOOLEAN_TYPE: | |
6181 | case INTEGER_CST: | |
6182 | case REAL_CST: | |
6183 | case STRING_CST: | |
6184 | return t; | |
6185 | ||
6186 | case INTEGER_TYPE: | |
6187 | if (t == integer_type_node) | |
6188 | return t; | |
6189 | ||
6190 | if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST | |
6191 | && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST) | |
6192 | return t; | |
d2e5ee5c | 6193 | |
5566b478 | 6194 | { |
ddce3528 | 6195 | tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0); |
7ddedda4 | 6196 | |
ddce3528 | 6197 | max = tsubst_expr (omax, args, complain, in_decl); |
4393e105 MM |
6198 | if (max == error_mark_node) |
6199 | return error_mark_node; | |
6200 | ||
8dd3f57a MM |
6201 | /* See if we can reduce this expression to something simpler. */ |
6202 | max = maybe_fold_nontype_arg (max); | |
6203 | if (!processing_template_decl && TREE_READONLY_DECL_P (max)) | |
6204 | max = decl_constant_value (max); | |
6205 | ||
856216bb MM |
6206 | if (processing_template_decl |
6207 | /* When providing explicit arguments to a template | |
6208 | function, but leaving some arguments for subsequent | |
6209 | deduction, MAX may be template-dependent even if we're | |
c95cd22e JM |
6210 | not PROCESSING_TEMPLATE_DECL. We still need to check for |
6211 | template parms, though; MAX won't be an INTEGER_CST for | |
6212 | dynamic arrays, either. */ | |
6213 | || (TREE_CODE (max) != INTEGER_CST | |
6214 | && uses_template_parms (max))) | |
ae58fa02 | 6215 | { |
8dd3f57a MM |
6216 | tree itype = make_node (INTEGER_TYPE); |
6217 | TYPE_MIN_VALUE (itype) = size_zero_node; | |
6218 | TYPE_MAX_VALUE (itype) = build_min (MINUS_EXPR, sizetype, max, | |
6219 | integer_one_node); | |
6220 | return itype; | |
ae58fa02 MM |
6221 | } |
6222 | ||
ddce3528 JM |
6223 | if (integer_zerop (omax)) |
6224 | { | |
6225 | /* Still allow an explicit array of size zero. */ | |
6226 | if (pedantic) | |
6227 | pedwarn ("creating array with size zero"); | |
6228 | } | |
07c88314 MM |
6229 | else if (integer_zerop (max) |
6230 | || (TREE_CODE (max) == INTEGER_CST | |
6231 | && INT_CST_LT (max, integer_zero_node))) | |
0ecfe0b4 | 6232 | { |
4393e105 MM |
6233 | /* [temp.deduct] |
6234 | ||
6235 | Type deduction may fail for any of the following | |
6236 | reasons: | |
6237 | ||
bf8f3f93 MM |
6238 | Attempting to create an array with a size that is |
6239 | zero or negative. */ | |
4393e105 | 6240 | if (complain) |
16bb3387 | 6241 | cp_error ("creating array with size zero (`%E')", max); |
4393e105 MM |
6242 | |
6243 | return error_mark_node; | |
0ecfe0b4 JM |
6244 | } |
6245 | ||
c95cd22e | 6246 | return compute_array_index_type (NULL_TREE, max); |
ae58fa02 MM |
6247 | } |
6248 | ||
6249 | case TEMPLATE_TYPE_PARM: | |
6250 | case TEMPLATE_TEMPLATE_PARM: | |
6251 | case TEMPLATE_PARM_INDEX: | |
6252 | { | |
6253 | int idx; | |
6254 | int level; | |
6255 | int levels; | |
0ecfe0b4 JM |
6256 | |
6257 | r = NULL_TREE; | |
ae58fa02 MM |
6258 | |
6259 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM | |
6260 | || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM) | |
6261 | { | |
6262 | idx = TEMPLATE_TYPE_IDX (t); | |
6263 | level = TEMPLATE_TYPE_LEVEL (t); | |
6264 | } | |
6265 | else | |
6266 | { | |
6267 | idx = TEMPLATE_PARM_IDX (t); | |
6268 | level = TEMPLATE_PARM_LEVEL (t); | |
6269 | } | |
6270 | ||
6271 | if (TREE_VEC_LENGTH (args) > 0) | |
6272 | { | |
6273 | tree arg = NULL_TREE; | |
6274 | ||
6275 | levels = TMPL_ARGS_DEPTH (args); | |
6276 | if (level <= levels) | |
6277 | arg = TMPL_ARG (args, level, idx); | |
6278 | ||
8b5b8b7c MM |
6279 | if (arg == error_mark_node) |
6280 | return error_mark_node; | |
6281 | else if (arg != NULL_TREE) | |
ae58fa02 MM |
6282 | { |
6283 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM) | |
6284 | { | |
2f939d94 | 6285 | my_friendly_assert (TYPE_P (arg), 0); |
adecb3f4 MM |
6286 | return cp_build_qualified_type_real |
6287 | (arg, CP_TYPE_QUALS (arg) | CP_TYPE_QUALS (t), | |
6288 | complain); | |
ae58fa02 MM |
6289 | } |
6290 | else if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM) | |
6291 | { | |
7ddedda4 | 6292 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t)) |
ae58fa02 MM |
6293 | { |
6294 | /* We are processing a type constructed from | |
6295 | a template template parameter */ | |
7ddedda4 | 6296 | tree argvec = tsubst (TYPE_TI_ARGS (t), |
4393e105 MM |
6297 | args, complain, in_decl); |
6298 | if (argvec == error_mark_node) | |
6299 | return error_mark_node; | |
6300 | ||
ae58fa02 MM |
6301 | /* We can get a TEMPLATE_TEMPLATE_PARM here when |
6302 | we are resolving nested-types in the signature of | |
6303 | a member function templates. | |
6304 | Otherwise ARG is a TEMPLATE_DECL and is the real | |
6305 | template to be instantiated. */ | |
6306 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
6307 | arg = TYPE_NAME (arg); | |
6308 | ||
6309 | r = lookup_template_class (DECL_NAME (arg), | |
6310 | argvec, in_decl, | |
6311 | DECL_CONTEXT (arg), | |
6312 | /*entering_scope=*/0); | |
adecb3f4 MM |
6313 | return cp_build_qualified_type_real (r, |
6314 | TYPE_QUALS (t), | |
6315 | complain); | |
ae58fa02 MM |
6316 | } |
6317 | else | |
6318 | /* We are processing a template argument list. */ | |
6319 | return arg; | |
6320 | } | |
6321 | else | |
6322 | return arg; | |
6323 | } | |
6324 | } | |
51924768 JM |
6325 | else |
6326 | my_friendly_abort (981018); | |
ae58fa02 MM |
6327 | |
6328 | if (level == 1) | |
6329 | /* This can happen during the attempted tsubst'ing in | |
6330 | unify. This means that we don't yet have any information | |
6331 | about the template parameter in question. */ | |
6332 | return t; | |
6333 | ||
6334 | /* If we get here, we must have been looking at a parm for a | |
6335 | more deeply nested template. Make a new version of this | |
6336 | template parameter, but with a lower level. */ | |
6337 | switch (TREE_CODE (t)) | |
6338 | { | |
6339 | case TEMPLATE_TYPE_PARM: | |
6340 | case TEMPLATE_TEMPLATE_PARM: | |
6341 | r = copy_node (t); | |
6342 | TEMPLATE_TYPE_PARM_INDEX (r) | |
6343 | = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t), | |
6344 | r, levels); | |
6345 | TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r); | |
6346 | TYPE_MAIN_VARIANT (r) = r; | |
6347 | TYPE_POINTER_TO (r) = NULL_TREE; | |
6348 | TYPE_REFERENCE_TO (r) = NULL_TREE; | |
6349 | ||
6350 | if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM | |
7ddedda4 | 6351 | && TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t)) |
ae58fa02 | 6352 | { |
4393e105 MM |
6353 | tree argvec = tsubst (TYPE_TI_ARGS (t), args, |
6354 | complain, in_decl); | |
6355 | if (argvec == error_mark_node) | |
6356 | return error_mark_node; | |
6357 | ||
7ddedda4 | 6358 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r) |
e1b3e07d | 6359 | = tree_cons (TYPE_NAME (t), argvec, NULL_TREE); |
ae58fa02 MM |
6360 | } |
6361 | break; | |
6362 | ||
6363 | case TEMPLATE_PARM_INDEX: | |
6364 | r = reduce_template_parm_level (t, type, levels); | |
6365 | break; | |
6366 | ||
6367 | default: | |
6368 | my_friendly_abort (0); | |
6369 | } | |
6370 | ||
5566b478 | 6371 | return r; |
ae58fa02 | 6372 | } |
5566b478 | 6373 | |
8d08fdba MS |
6374 | case TREE_LIST: |
6375 | { | |
6376 | tree purpose, value, chain, result; | |
8d08fdba MS |
6377 | |
6378 | if (t == void_list_node) | |
6379 | return t; | |
6380 | ||
8d08fdba MS |
6381 | purpose = TREE_PURPOSE (t); |
6382 | if (purpose) | |
4393e105 MM |
6383 | { |
6384 | purpose = tsubst (purpose, args, complain, in_decl); | |
6385 | if (purpose == error_mark_node) | |
6386 | return error_mark_node; | |
6387 | } | |
8d08fdba MS |
6388 | value = TREE_VALUE (t); |
6389 | if (value) | |
4393e105 MM |
6390 | { |
6391 | value = tsubst (value, args, complain, in_decl); | |
6392 | if (value == error_mark_node) | |
6393 | return error_mark_node; | |
6394 | } | |
8d08fdba MS |
6395 | chain = TREE_CHAIN (t); |
6396 | if (chain && chain != void_type_node) | |
4393e105 MM |
6397 | { |
6398 | chain = tsubst (chain, args, complain, in_decl); | |
6399 | if (chain == error_mark_node) | |
6400 | return error_mark_node; | |
6401 | } | |
8d08fdba MS |
6402 | if (purpose == TREE_PURPOSE (t) |
6403 | && value == TREE_VALUE (t) | |
6404 | && chain == TREE_CHAIN (t)) | |
6405 | return t; | |
51632249 | 6406 | result = hash_tree_cons (purpose, value, chain); |
8d08fdba MS |
6407 | TREE_PARMLIST (result) = TREE_PARMLIST (t); |
6408 | return result; | |
6409 | } | |
6410 | case TREE_VEC: | |
5566b478 MS |
6411 | if (type != NULL_TREE) |
6412 | { | |
1ceaad38 JM |
6413 | /* A binfo node. We always need to make a copy, of the node |
6414 | itself and of its BINFO_BASETYPES. */ | |
85b71cf2 | 6415 | |
5566b478 MS |
6416 | t = copy_node (t); |
6417 | ||
c7449f2b JM |
6418 | /* Make sure type isn't a typedef copy. */ |
6419 | type = BINFO_TYPE (TYPE_BINFO (type)); | |
6420 | ||
5566b478 | 6421 | TREE_TYPE (t) = complete_type (type); |
6633d636 MS |
6422 | if (IS_AGGR_TYPE (type)) |
6423 | { | |
6424 | BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (type); | |
6425 | BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (type); | |
6426 | if (TYPE_BINFO_BASETYPES (type) != NULL_TREE) | |
6427 | BINFO_BASETYPES (t) = copy_node (TYPE_BINFO_BASETYPES (type)); | |
6428 | } | |
5566b478 MS |
6429 | return t; |
6430 | } | |
85b71cf2 JM |
6431 | |
6432 | /* Otherwise, a vector of template arguments. */ | |
4393e105 | 6433 | return tsubst_template_arg_vector (t, args, complain); |
8d08fdba | 6434 | |
8d08fdba MS |
6435 | case POINTER_TYPE: |
6436 | case REFERENCE_TYPE: | |
6437 | { | |
8d08fdba | 6438 | enum tree_code code; |
79a7c7fa | 6439 | |
8d08fdba MS |
6440 | if (type == TREE_TYPE (t)) |
6441 | return t; | |
6442 | ||
6443 | code = TREE_CODE (t); | |
4393e105 MM |
6444 | |
6445 | ||
6446 | /* [temp.deduct] | |
6447 | ||
6448 | Type deduction may fail for any of the following | |
6449 | reasons: | |
6450 | ||
6451 | -- Attempting to create a pointer to reference type. | |
6452 | -- Attempting to create a reference to a reference type or | |
6453 | a reference to void. */ | |
0ecfe0b4 JM |
6454 | if (TREE_CODE (type) == REFERENCE_TYPE |
6455 | || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE)) | |
79a7c7fa JM |
6456 | { |
6457 | static int last_line = 0; | |
6458 | static char* last_file = 0; | |
6459 | ||
6460 | /* We keep track of the last time we issued this error | |
6461 | message to avoid spewing a ton of messages during a | |
6462 | single bad template instantiation. */ | |
4393e105 MM |
6463 | if (complain && (last_line != lineno || |
6464 | last_file != input_filename)) | |
79a7c7fa | 6465 | { |
0ecfe0b4 JM |
6466 | if (TREE_CODE (type) == VOID_TYPE) |
6467 | cp_error ("forming reference to void"); | |
6468 | else | |
6469 | cp_error ("forming %s to reference type `%T'", | |
6470 | (code == POINTER_TYPE) ? "pointer" : "reference", | |
6471 | type); | |
79a7c7fa JM |
6472 | last_line = lineno; |
6473 | last_file = input_filename; | |
6474 | } | |
6475 | ||
4393e105 | 6476 | return error_mark_node; |
79a7c7fa JM |
6477 | } |
6478 | else if (code == POINTER_TYPE) | |
8d08fdba MS |
6479 | r = build_pointer_type (type); |
6480 | else | |
6481 | r = build_reference_type (type); | |
adecb3f4 | 6482 | r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain); |
79a7c7fa | 6483 | |
8d08fdba MS |
6484 | /* Will this ever be needed for TYPE_..._TO values? */ |
6485 | layout_type (r); | |
6486 | return r; | |
6487 | } | |
a4443a08 | 6488 | case OFFSET_TYPE: |
0ecfe0b4 | 6489 | { |
4393e105 MM |
6490 | r = tsubst (TYPE_OFFSET_BASETYPE (t), args, complain, in_decl); |
6491 | if (r == error_mark_node || !IS_AGGR_TYPE (r)) | |
6492 | { | |
6493 | /* [temp.deduct] | |
6494 | ||
6495 | Type deduction may fail for any of the following | |
6496 | reasons: | |
6497 | ||
6498 | -- Attempting to create "pointer to member of T" when T | |
6499 | is not a class type. */ | |
6500 | if (complain) | |
6501 | cp_error ("creating pointer to member of non-class type `%T'", | |
6502 | r); | |
6503 | return error_mark_node; | |
6504 | } | |
0ecfe0b4 JM |
6505 | return build_offset_type (r, type); |
6506 | } | |
8d08fdba MS |
6507 | case FUNCTION_TYPE: |
6508 | case METHOD_TYPE: | |
6509 | { | |
c11b6f21 | 6510 | tree fntype; |
4393e105 | 6511 | tree raises; |
8d08fdba | 6512 | |
4393e105 MM |
6513 | fntype = tsubst_function_type (t, args, complain, in_decl); |
6514 | if (fntype == error_mark_node) | |
6515 | return error_mark_node; | |
cabc336a MM |
6516 | |
6517 | /* Substitue the exception specification. */ | |
6518 | raises = TYPE_RAISES_EXCEPTIONS (t); | |
c11b6f21 MS |
6519 | if (raises) |
6520 | { | |
4cc1d462 NS |
6521 | tree list = NULL_TREE; |
6522 | ||
6523 | if (! TREE_VALUE (raises)) | |
6524 | list = raises; | |
6525 | else | |
6526 | for (; raises != NULL_TREE; raises = TREE_CHAIN (raises)) | |
6527 | { | |
6528 | tree spec = TREE_VALUE (raises); | |
6529 | ||
6530 | spec = tsubst (spec, args, complain, in_decl); | |
6531 | if (spec == error_mark_node) | |
6532 | return spec; | |
6533 | list = add_exception_specifier (list, spec, complain); | |
6534 | } | |
6535 | fntype = build_exception_variant (fntype, list); | |
c11b6f21 MS |
6536 | } |
6537 | return fntype; | |
8d08fdba MS |
6538 | } |
6539 | case ARRAY_TYPE: | |
6540 | { | |
4393e105 MM |
6541 | tree domain = tsubst (TYPE_DOMAIN (t), args, complain, in_decl); |
6542 | if (domain == error_mark_node) | |
6543 | return error_mark_node; | |
6544 | ||
6545 | /* As an optimization, we avoid regenerating the array type if | |
6546 | it will obviously be the same as T. */ | |
8d08fdba MS |
6547 | if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) |
6548 | return t; | |
0ecfe0b4 | 6549 | |
4393e105 MM |
6550 | /* These checks should match the ones in grokdeclarator. |
6551 | ||
6552 | [temp.deduct] | |
6553 | ||
6554 | The deduction may fail for any of the following reasons: | |
6555 | ||
6556 | -- Attempting to create an array with an element type that | |
6557 | is void, a function type, or a reference type. */ | |
6558 | if (TREE_CODE (type) == VOID_TYPE | |
6559 | || TREE_CODE (type) == FUNCTION_TYPE | |
6560 | || TREE_CODE (type) == REFERENCE_TYPE) | |
0ecfe0b4 | 6561 | { |
4393e105 MM |
6562 | if (complain) |
6563 | cp_error ("creating array of `%T'", type); | |
6564 | return error_mark_node; | |
0ecfe0b4 JM |
6565 | } |
6566 | ||
8d08fdba MS |
6567 | r = build_cplus_array_type (type, domain); |
6568 | return r; | |
6569 | } | |
6570 | ||
8d08fdba | 6571 | case PLUS_EXPR: |
5566b478 | 6572 | case MINUS_EXPR: |
4393e105 MM |
6573 | { |
6574 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6575 | in_decl); | |
6576 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, | |
6577 | in_decl); | |
6578 | ||
6579 | if (e1 == error_mark_node || e2 == error_mark_node) | |
6580 | return error_mark_node; | |
6581 | ||
6582 | return fold (build (TREE_CODE (t), TREE_TYPE (t), e1, e2)); | |
6583 | } | |
8d08fdba MS |
6584 | |
6585 | case NEGATE_EXPR: | |
6586 | case NOP_EXPR: | |
4393e105 MM |
6587 | { |
6588 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6589 | in_decl); | |
6590 | if (e == error_mark_node) | |
6591 | return error_mark_node; | |
6592 | ||
6593 | return fold (build (TREE_CODE (t), TREE_TYPE (t), e)); | |
6594 | } | |
8d08fdba | 6595 | |
5566b478 MS |
6596 | case TYPENAME_TYPE: |
6597 | { | |
4393e105 MM |
6598 | tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain, |
6599 | in_decl, /*entering_scope=*/1); | |
6600 | tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args, | |
6601 | complain, in_decl); | |
6602 | ||
6603 | if (ctx == error_mark_node || f == error_mark_node) | |
6604 | return error_mark_node; | |
ae58fa02 | 6605 | |
bf8f3f93 MM |
6606 | if (!IS_AGGR_TYPE (ctx)) |
6607 | { | |
6608 | if (complain) | |
6609 | cp_error ("`%T' is not a class, struct, or union type", | |
6610 | ctx); | |
6611 | return error_mark_node; | |
6612 | } | |
6613 | else if (!uses_template_parms (ctx) && !TYPE_BEING_DEFINED (ctx)) | |
6614 | { | |
6615 | /* Normally, make_typename_type does not require that the CTX | |
6616 | have complete type in order to allow things like: | |
ae58fa02 | 6617 | |
bf8f3f93 | 6618 | template <class T> struct S { typename S<T>::X Y; }; |
ae58fa02 | 6619 | |
bf8f3f93 MM |
6620 | But, such constructs have already been resolved by this |
6621 | point, so here CTX really should have complete type, unless | |
6622 | it's a partial instantiation. */ | |
4393e105 | 6623 | ctx = complete_type (ctx); |
d0f062fb | 6624 | if (!COMPLETE_TYPE_P (ctx)) |
4393e105 MM |
6625 | { |
6626 | if (complain) | |
6627 | incomplete_type_error (NULL_TREE, ctx); | |
6628 | return error_mark_node; | |
6629 | } | |
6630 | } | |
ae58fa02 | 6631 | |
3baa501d | 6632 | f = make_typename_type (ctx, f, complain); |
f0bcd168 MM |
6633 | if (f == error_mark_node) |
6634 | return f; | |
adecb3f4 MM |
6635 | return cp_build_qualified_type_real (f, |
6636 | CP_TYPE_QUALS (f) | |
6637 | | CP_TYPE_QUALS (t), | |
6638 | complain); | |
5566b478 MS |
6639 | } |
6640 | ||
6641 | case INDIRECT_REF: | |
4393e105 MM |
6642 | { |
6643 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6644 | in_decl); | |
6645 | if (e == error_mark_node) | |
6646 | return error_mark_node; | |
6647 | return make_pointer_declarator (type, e); | |
6648 | } | |
6649 | ||
5566b478 | 6650 | case ADDR_EXPR: |
4393e105 MM |
6651 | { |
6652 | tree e = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6653 | in_decl); | |
6654 | if (e == error_mark_node) | |
6655 | return error_mark_node; | |
6656 | return make_reference_declarator (type, e); | |
6657 | } | |
5566b478 MS |
6658 | |
6659 | case ARRAY_REF: | |
4393e105 MM |
6660 | { |
6661 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6662 | in_decl); | |
6fb2c05a JM |
6663 | tree e2 = tsubst_expr (TREE_OPERAND (t, 1), args, complain, |
6664 | in_decl); | |
4393e105 MM |
6665 | if (e1 == error_mark_node || e2 == error_mark_node) |
6666 | return error_mark_node; | |
6667 | ||
6668 | return build_parse_node (ARRAY_REF, e1, e2, tsubst_expr); | |
6669 | } | |
5566b478 MS |
6670 | |
6671 | case CALL_EXPR: | |
4393e105 MM |
6672 | { |
6673 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6674 | in_decl); | |
43f887f9 MM |
6675 | tree e2 = (tsubst_call_declarator_parms |
6676 | (CALL_DECLARATOR_PARMS (t), args, complain, in_decl)); | |
6677 | tree e3 = tsubst (CALL_DECLARATOR_EXCEPTION_SPEC (t), args, | |
6678 | complain, in_decl); | |
4393e105 MM |
6679 | |
6680 | if (e1 == error_mark_node || e2 == error_mark_node | |
6681 | || e3 == error_mark_node) | |
6682 | return error_mark_node; | |
6683 | ||
43f887f9 | 6684 | return make_call_declarator (e1, e2, CALL_DECLARATOR_QUALS (t), e3); |
4393e105 | 6685 | } |
5566b478 | 6686 | |
fc378698 | 6687 | case SCOPE_REF: |
4393e105 MM |
6688 | { |
6689 | tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, | |
6690 | in_decl); | |
6691 | tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl); | |
6692 | if (e1 == error_mark_node || e2 == error_mark_node) | |
6693 | return error_mark_node; | |
6694 | ||
6695 | return build_parse_node (TREE_CODE (t), e1, e2); | |
6696 | } | |
fc378698 | 6697 | |
b894fc05 | 6698 | case TYPEOF_TYPE: |
4393e105 MM |
6699 | { |
6700 | tree e1 = tsubst_expr (TYPE_FIELDS (t), args, complain, | |
6701 | in_decl); | |
6702 | if (e1 == error_mark_node) | |
6703 | return error_mark_node; | |
6704 | ||
6705 | return TREE_TYPE (e1); | |
6706 | } | |
b894fc05 | 6707 | |
f9817201 MM |
6708 | case FUNCTION_NAME: |
6709 | { | |
6710 | const char *name; | |
6711 | int len; | |
6712 | tree type; | |
6713 | tree str; | |
6714 | ||
6715 | /* This code should match declare_hidden_char_array in | |
6716 | c-common.c. */ | |
6717 | name = (*decl_printable_name) (current_function_decl, 2); | |
6718 | len = strlen (name) + 1; | |
6719 | type = build_array_type (char_type_node, | |
6720 | build_index_type (build_int_2 (len, 0))); | |
6721 | str = build_string (len, name); | |
6722 | TREE_TYPE (str) = type; | |
6723 | return str; | |
6724 | } | |
6725 | ||
8d08fdba | 6726 | default: |
5566b478 | 6727 | sorry ("use of `%s' in template", |
8d08fdba MS |
6728 | tree_code_name [(int) TREE_CODE (t)]); |
6729 | return error_mark_node; | |
6730 | } | |
6731 | } | |
6732 | ||
00d3396f JM |
6733 | /* Like tsubst, but deals with expressions. This function just replaces |
6734 | template parms; to finish processing the resultant expression, use | |
6735 | tsubst_expr. */ | |
6736 | ||
5566b478 | 6737 | tree |
4393e105 | 6738 | tsubst_copy (t, args, complain, in_decl) |
98c1c668 | 6739 | tree t, args; |
4393e105 | 6740 | int complain; |
5566b478 MS |
6741 | tree in_decl; |
6742 | { | |
6743 | enum tree_code code; | |
8452b1d3 | 6744 | tree r; |
8d08fdba | 6745 | |
5566b478 MS |
6746 | if (t == NULL_TREE || t == error_mark_node) |
6747 | return t; | |
6748 | ||
6749 | code = TREE_CODE (t); | |
b7484fbe | 6750 | |
5566b478 MS |
6751 | switch (code) |
6752 | { | |
6753 | case PARM_DECL: | |
a759e627 | 6754 | return do_identifier (DECL_NAME (t), 0, NULL_TREE); |
5566b478 MS |
6755 | |
6756 | case CONST_DECL: | |
ed44da02 MM |
6757 | { |
6758 | tree enum_type; | |
6759 | tree v; | |
6760 | ||
6761 | if (!DECL_CONTEXT (t)) | |
6762 | /* This is a global enumeration constant. */ | |
6763 | return t; | |
6764 | ||
6765 | /* Unfortunately, we cannot just call lookup_name here. | |
9188c363 MM |
6766 | Consider: |
6767 | ||
6768 | template <int I> int f() { | |
6769 | enum E { a = I }; | |
6770 | struct S { void g() { E e = a; } }; | |
6771 | }; | |
6772 | ||
6773 | When we instantiate f<7>::S::g(), say, lookup_name is not | |
6774 | clever enough to find f<7>::a. */ | |
ed44da02 | 6775 | enum_type |
4393e105 | 6776 | = tsubst_aggr_type (TREE_TYPE (t), args, complain, in_decl, |
ed44da02 MM |
6777 | /*entering_scope=*/0); |
6778 | ||
6779 | for (v = TYPE_VALUES (enum_type); | |
6780 | v != NULL_TREE; | |
6781 | v = TREE_CHAIN (v)) | |
6782 | if (TREE_PURPOSE (v) == DECL_NAME (t)) | |
6783 | return TREE_VALUE (v); | |
6784 | ||
6785 | /* We didn't find the name. That should never happen; if | |
6786 | name-lookup found it during preliminary parsing, we | |
6787 | should find it again here during instantiation. */ | |
6788 | my_friendly_abort (0); | |
6789 | } | |
db04386f | 6790 | return t; |
ed44da02 | 6791 | |
5566b478 MS |
6792 | case FIELD_DECL: |
6793 | if (DECL_CONTEXT (t)) | |
6794 | { | |
0978790f | 6795 | tree ctx; |
0978790f | 6796 | |
4393e105 | 6797 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, complain, in_decl, |
36a117a5 | 6798 | /*entering_scope=*/1); |
0978790f | 6799 | if (ctx != DECL_CONTEXT (t)) |
5566b478 MS |
6800 | return lookup_field (ctx, DECL_NAME (t), 0, 0); |
6801 | } | |
6802 | return t; | |
6803 | ||
6804 | case VAR_DECL: | |
6805 | case FUNCTION_DECL: | |
6806 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)) | |
4393e105 | 6807 | t = tsubst (t, args, complain, in_decl); |
5566b478 MS |
6808 | mark_used (t); |
6809 | return t; | |
6810 | ||
98c1c668 JM |
6811 | case TEMPLATE_DECL: |
6812 | if (is_member_template (t)) | |
4393e105 | 6813 | return tsubst (t, args, complain, in_decl); |
98c1c668 JM |
6814 | else |
6815 | return t; | |
6816 | ||
672476cb MM |
6817 | case LOOKUP_EXPR: |
6818 | { | |
6819 | /* We must tsbust into a LOOKUP_EXPR in case the names to | |
6820 | which it refers is a conversion operator; in that case the | |
6821 | name will change. We avoid making unnecessary copies, | |
6822 | however. */ | |
6823 | ||
4393e105 | 6824 | tree id = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl); |
672476cb MM |
6825 | |
6826 | if (id != TREE_OPERAND (t, 0)) | |
6827 | { | |
8452b1d3 | 6828 | r = build_nt (LOOKUP_EXPR, id); |
672476cb MM |
6829 | LOOKUP_EXPR_GLOBAL (r) = LOOKUP_EXPR_GLOBAL (t); |
6830 | t = r; | |
6831 | } | |
6832 | ||
6833 | return t; | |
6834 | } | |
6835 | ||
5566b478 MS |
6836 | case CAST_EXPR: |
6837 | case REINTERPRET_CAST_EXPR: | |
e92cc029 MS |
6838 | case CONST_CAST_EXPR: |
6839 | case STATIC_CAST_EXPR: | |
6840 | case DYNAMIC_CAST_EXPR: | |
51924768 | 6841 | case NOP_EXPR: |
5566b478 | 6842 | return build1 |
4393e105 MM |
6843 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
6844 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); | |
5566b478 MS |
6845 | |
6846 | case INDIRECT_REF: | |
6847 | case PREDECREMENT_EXPR: | |
6848 | case PREINCREMENT_EXPR: | |
6849 | case POSTDECREMENT_EXPR: | |
6850 | case POSTINCREMENT_EXPR: | |
6851 | case NEGATE_EXPR: | |
6852 | case TRUTH_NOT_EXPR: | |
b87692e5 | 6853 | case BIT_NOT_EXPR: |
5566b478 MS |
6854 | case ADDR_EXPR: |
6855 | case CONVERT_EXPR: /* Unary + */ | |
6856 | case SIZEOF_EXPR: | |
abff8e06 | 6857 | case ALIGNOF_EXPR: |
5566b478 | 6858 | case ARROW_EXPR: |
fc378698 | 6859 | case THROW_EXPR: |
5156628f | 6860 | case TYPEID_EXPR: |
f5733617 SS |
6861 | case REALPART_EXPR: |
6862 | case IMAGPART_EXPR: | |
5566b478 | 6863 | return build1 |
6a629cac | 6864 | (code, tsubst (TREE_TYPE (t), args, complain, in_decl), |
4393e105 | 6865 | tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)); |
5566b478 MS |
6866 | |
6867 | case PLUS_EXPR: | |
6868 | case MINUS_EXPR: | |
6869 | case MULT_EXPR: | |
6870 | case TRUNC_DIV_EXPR: | |
6871 | case CEIL_DIV_EXPR: | |
6872 | case FLOOR_DIV_EXPR: | |
6873 | case ROUND_DIV_EXPR: | |
6874 | case EXACT_DIV_EXPR: | |
6875 | case BIT_AND_EXPR: | |
6876 | case BIT_ANDTC_EXPR: | |
6877 | case BIT_IOR_EXPR: | |
6878 | case BIT_XOR_EXPR: | |
6879 | case TRUNC_MOD_EXPR: | |
6880 | case FLOOR_MOD_EXPR: | |
6881 | case TRUTH_ANDIF_EXPR: | |
6882 | case TRUTH_ORIF_EXPR: | |
6883 | case TRUTH_AND_EXPR: | |
6884 | case TRUTH_OR_EXPR: | |
6885 | case RSHIFT_EXPR: | |
6886 | case LSHIFT_EXPR: | |
6887 | case RROTATE_EXPR: | |
6888 | case LROTATE_EXPR: | |
6889 | case EQ_EXPR: | |
6890 | case NE_EXPR: | |
6891 | case MAX_EXPR: | |
6892 | case MIN_EXPR: | |
6893 | case LE_EXPR: | |
6894 | case GE_EXPR: | |
6895 | case LT_EXPR: | |
6896 | case GT_EXPR: | |
6897 | case COMPONENT_REF: | |
6898 | case ARRAY_REF: | |
6899 | case COMPOUND_EXPR: | |
6900 | case SCOPE_REF: | |
6901 | case DOTSTAR_EXPR: | |
6902 | case MEMBER_REF: | |
6903 | return build_nt | |
4393e105 MM |
6904 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
6905 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 MS |
6906 | |
6907 | case CALL_EXPR: | |
6908 | { | |
6909 | tree fn = TREE_OPERAND (t, 0); | |
f84b4be9 | 6910 | if (is_overloaded_fn (fn)) |
4393e105 | 6911 | fn = tsubst_copy (get_first_fn (fn), args, complain, in_decl); |
5566b478 | 6912 | else |
f84b4be9 | 6913 | /* Sometimes FN is a LOOKUP_EXPR. */ |
4393e105 | 6914 | fn = tsubst_copy (fn, args, complain, in_decl); |
5566b478 | 6915 | return build_nt |
4393e105 MM |
6916 | (code, fn, tsubst_copy (TREE_OPERAND (t, 1), args, complain, |
6917 | in_decl), | |
5566b478 MS |
6918 | NULL_TREE); |
6919 | } | |
6920 | ||
6921 | case METHOD_CALL_EXPR: | |
6922 | { | |
6923 | tree name = TREE_OPERAND (t, 0); | |
6924 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
6925 | { | |
4393e105 MM |
6926 | name = tsubst_copy (TREE_OPERAND (name, 0), args, |
6927 | complain, in_decl); | |
7bae46f4 | 6928 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6929 | } |
6930 | else if (TREE_CODE (name) == SCOPE_REF | |
6931 | && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR) | |
6932 | { | |
4393e105 MM |
6933 | tree base = tsubst_copy (TREE_OPERAND (name, 0), args, |
6934 | complain, in_decl); | |
5566b478 | 6935 | name = TREE_OPERAND (name, 1); |
4393e105 MM |
6936 | name = tsubst_copy (TREE_OPERAND (name, 0), args, |
6937 | complain, in_decl); | |
11686454 | 6938 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6939 | name = build_nt (SCOPE_REF, base, name); |
6940 | } | |
6941 | else | |
4393e105 | 6942 | name = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl); |
5566b478 | 6943 | return build_nt |
4393e105 MM |
6944 | (code, name, tsubst_copy (TREE_OPERAND (t, 1), args, |
6945 | complain, in_decl), | |
6946 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl), | |
5566b478 MS |
6947 | NULL_TREE); |
6948 | } | |
6949 | ||
558475f0 MM |
6950 | case STMT_EXPR: |
6951 | /* This processing should really occur in tsubst_expr, However, | |
6952 | tsubst_expr does not recurse into expressions, since it | |
6953 | assumes that there aren't any statements inside them. | |
6954 | Instead, it simply calls build_expr_from_tree. So, we need | |
6955 | to expand the STMT_EXPR here. */ | |
6956 | if (!processing_template_decl) | |
6957 | { | |
b5ac18ea | 6958 | tree stmt_expr = begin_stmt_expr (); |
447cfcb9 MM |
6959 | tsubst_expr (STMT_EXPR_STMT (t), args, |
6960 | complain, in_decl); | |
b5ac18ea | 6961 | return finish_stmt_expr (stmt_expr); |
558475f0 | 6962 | } |
9d9169de MM |
6963 | |
6964 | return t; | |
558475f0 | 6965 | |
5566b478 MS |
6966 | case COND_EXPR: |
6967 | case MODOP_EXPR: | |
40242ccf | 6968 | case PSEUDO_DTOR_EXPR: |
67da3287 | 6969 | { |
8452b1d3 | 6970 | r = build_nt |
4393e105 MM |
6971 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
6972 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
6973 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
67da3287 MM |
6974 | return r; |
6975 | } | |
5566b478 MS |
6976 | |
6977 | case NEW_EXPR: | |
6978 | { | |
8452b1d3 | 6979 | r = build_nt |
4393e105 MM |
6980 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
6981 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl), | |
6982 | tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl)); | |
5566b478 MS |
6983 | NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t); |
6984 | return r; | |
6985 | } | |
6986 | ||
6987 | case DELETE_EXPR: | |
6988 | { | |
8452b1d3 | 6989 | r = build_nt |
4393e105 MM |
6990 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), |
6991 | tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl)); | |
5566b478 MS |
6992 | DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t); |
6993 | DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t); | |
6994 | return r; | |
6995 | } | |
6996 | ||
386b8a85 JM |
6997 | case TEMPLATE_ID_EXPR: |
6998 | { | |
00d3396f | 6999 | /* Substituted template arguments */ |
4393e105 MM |
7000 | tree targs = tsubst_copy (TREE_OPERAND (t, 1), args, complain, |
7001 | in_decl); | |
856216bb MM |
7002 | |
7003 | if (targs && TREE_CODE (targs) == TREE_LIST) | |
7004 | { | |
7005 | tree chain; | |
7006 | for (chain = targs; chain; chain = TREE_CHAIN (chain)) | |
7007 | TREE_VALUE (chain) = maybe_fold_nontype_arg (TREE_VALUE (chain)); | |
7008 | } | |
7009 | else if (targs) | |
7010 | { | |
7011 | int i; | |
7012 | for (i = 0; i < TREE_VEC_LENGTH (targs); ++i) | |
7013 | TREE_VEC_ELT (targs, i) | |
7014 | = maybe_fold_nontype_arg (TREE_VEC_ELT (targs, i)); | |
7015 | } | |
00d3396f JM |
7016 | |
7017 | return lookup_template_function | |
4393e105 | 7018 | (tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl), targs); |
386b8a85 JM |
7019 | } |
7020 | ||
5566b478 MS |
7021 | case TREE_LIST: |
7022 | { | |
7023 | tree purpose, value, chain; | |
7024 | ||
7025 | if (t == void_list_node) | |
7026 | return t; | |
7027 | ||
7028 | purpose = TREE_PURPOSE (t); | |
7029 | if (purpose) | |
4393e105 | 7030 | purpose = tsubst_copy (purpose, args, complain, in_decl); |
5566b478 MS |
7031 | value = TREE_VALUE (t); |
7032 | if (value) | |
4393e105 | 7033 | value = tsubst_copy (value, args, complain, in_decl); |
5566b478 MS |
7034 | chain = TREE_CHAIN (t); |
7035 | if (chain && chain != void_type_node) | |
4393e105 | 7036 | chain = tsubst_copy (chain, args, complain, in_decl); |
5566b478 MS |
7037 | if (purpose == TREE_PURPOSE (t) |
7038 | && value == TREE_VALUE (t) | |
7039 | && chain == TREE_CHAIN (t)) | |
7040 | return t; | |
7041 | return tree_cons (purpose, value, chain); | |
7042 | } | |
7043 | ||
7044 | case RECORD_TYPE: | |
7045 | case UNION_TYPE: | |
7046 | case ENUMERAL_TYPE: | |
7047 | case INTEGER_TYPE: | |
7048 | case TEMPLATE_TYPE_PARM: | |
73b0fce8 | 7049 | case TEMPLATE_TEMPLATE_PARM: |
f84b4be9 | 7050 | case TEMPLATE_PARM_INDEX: |
5566b478 MS |
7051 | case POINTER_TYPE: |
7052 | case REFERENCE_TYPE: | |
7053 | case OFFSET_TYPE: | |
7054 | case FUNCTION_TYPE: | |
7055 | case METHOD_TYPE: | |
7056 | case ARRAY_TYPE: | |
7057 | case TYPENAME_TYPE: | |
f84b4be9 | 7058 | case TYPE_DECL: |
4393e105 | 7059 | return tsubst (t, args, complain, in_decl); |
5566b478 | 7060 | |
e92cc029 | 7061 | case IDENTIFIER_NODE: |
8e710788 BK |
7062 | if (IDENTIFIER_TYPENAME_P (t) |
7063 | /* Make sure it's not just a variable named `__opr', for instance, | |
7064 | which can occur in some existing code. */ | |
7065 | && TREE_TYPE (t)) | |
e92cc029 | 7066 | return build_typename_overload |
4393e105 | 7067 | (tsubst (TREE_TYPE (t), args, complain, in_decl)); |
e92cc029 MS |
7068 | else |
7069 | return t; | |
7070 | ||
5156628f | 7071 | case CONSTRUCTOR: |
8452b1d3 JM |
7072 | { |
7073 | r = build | |
4393e105 MM |
7074 | (CONSTRUCTOR, tsubst (TREE_TYPE (t), args, complain, in_decl), |
7075 | NULL_TREE, tsubst_copy (CONSTRUCTOR_ELTS (t), args, | |
7076 | complain, in_decl)); | |
8452b1d3 JM |
7077 | TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t); |
7078 | return r; | |
7079 | } | |
5156628f | 7080 | |
371534a9 MM |
7081 | case VA_ARG_EXPR: |
7082 | return build_va_arg (tsubst_copy (TREE_OPERAND (t, 0), args, complain, | |
7083 | in_decl), | |
7084 | tsubst (TREE_TYPE (t), args, complain, in_decl)); | |
f9817201 MM |
7085 | |
7086 | case FUNCTION_NAME: | |
7087 | return tsubst (t, args, complain, in_decl); | |
7088 | ||
5566b478 MS |
7089 | default: |
7090 | return t; | |
7091 | } | |
7092 | } | |
7093 | ||
558475f0 | 7094 | /* Like tsubst_copy, but also does semantic processing. */ |
00d3396f | 7095 | |
5566b478 | 7096 | tree |
4393e105 | 7097 | tsubst_expr (t, args, complain, in_decl) |
98c1c668 | 7098 | tree t, args; |
4393e105 | 7099 | int complain; |
5566b478 MS |
7100 | tree in_decl; |
7101 | { | |
558475f0 MM |
7102 | tree stmt; |
7103 | ||
5566b478 MS |
7104 | if (t == NULL_TREE || t == error_mark_node) |
7105 | return t; | |
7106 | ||
5156628f | 7107 | if (processing_template_decl) |
4393e105 | 7108 | return tsubst_copy (t, args, complain, in_decl); |
5566b478 MS |
7109 | |
7110 | switch (TREE_CODE (t)) | |
8d08fdba | 7111 | { |
558475f0 | 7112 | case RETURN_INIT: |
a7e4cfa0 | 7113 | prep_stmt (t); |
558475f0 MM |
7114 | finish_named_return_value |
7115 | (TREE_OPERAND (t, 0), | |
7116 | tsubst_expr (TREE_OPERAND (t, 1), args, /*complain=*/1, in_decl)); | |
7117 | tsubst_expr (TREE_CHAIN (t), args, complain, in_decl); | |
7118 | break; | |
7119 | ||
7120 | case CTOR_INITIALIZER: | |
a7e4cfa0 | 7121 | prep_stmt (t); |
558475f0 MM |
7122 | current_member_init_list |
7123 | = tsubst_expr_values (TREE_OPERAND (t, 0), args); | |
7124 | current_base_init_list | |
7125 | = tsubst_expr_values (TREE_OPERAND (t, 1), args); | |
7126 | setup_vtbl_ptr (); | |
7127 | tsubst_expr (TREE_CHAIN (t), args, complain, in_decl); | |
7128 | break; | |
7129 | ||
5566b478 | 7130 | case RETURN_STMT: |
a7e4cfa0 | 7131 | prep_stmt (t); |
ad321293 | 7132 | finish_return_stmt (tsubst_expr (RETURN_EXPR (t), |
4393e105 | 7133 | args, complain, in_decl)); |
5566b478 MS |
7134 | break; |
7135 | ||
7136 | case EXPR_STMT: | |
a7e4cfa0 | 7137 | prep_stmt (t); |
ad321293 | 7138 | finish_expr_stmt (tsubst_expr (EXPR_STMT_EXPR (t), |
4393e105 | 7139 | args, complain, in_decl)); |
5566b478 MS |
7140 | break; |
7141 | ||
7142 | case DECL_STMT: | |
7143 | { | |
e0942dcd MM |
7144 | tree decl; |
7145 | tree init; | |
5566b478 | 7146 | |
a7e4cfa0 | 7147 | prep_stmt (t); |
e0942dcd | 7148 | decl = DECL_STMT_DECL (t); |
acef433b MM |
7149 | if (TREE_CODE (decl) == LABEL_DECL) |
7150 | finish_label_decl (DECL_NAME (decl)); | |
7151 | else | |
7152 | { | |
7153 | init = DECL_INITIAL (decl); | |
7154 | decl = tsubst (decl, args, complain, in_decl); | |
7155 | init = tsubst_expr (init, args, complain, in_decl); | |
24bef158 MM |
7156 | if (init) |
7157 | DECL_INITIAL (decl) = error_mark_node; | |
b7b8bcd2 MM |
7158 | /* By marking the declaration as instantiated, we avoid |
7159 | trying to instantiate it. Since instantiate_decl can't | |
7160 | handle local variables, and since we've already done | |
7161 | all that needs to be done, that's the right thing to | |
7162 | do. */ | |
acef433b MM |
7163 | if (TREE_CODE (decl) == VAR_DECL) |
7164 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
7165 | maybe_push_decl (decl); | |
cd9f6678 | 7166 | cp_finish_decl (decl, init, NULL_TREE, 0); |
acef433b | 7167 | } |
e0942dcd | 7168 | return decl; |
5566b478 | 7169 | } |
8d08fdba | 7170 | |
5566b478 MS |
7171 | case FOR_STMT: |
7172 | { | |
7173 | tree tmp; | |
a7e4cfa0 | 7174 | prep_stmt (t); |
5566b478 | 7175 | |
558475f0 | 7176 | stmt = begin_for_stmt (); |
ad321293 | 7177 | for (tmp = FOR_INIT_STMT (t); tmp; tmp = TREE_CHAIN (tmp)) |
4393e105 | 7178 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7179 | finish_for_init_stmt (stmt); |
ad321293 | 7180 | finish_for_cond (tsubst_expr (FOR_COND (t), args, |
4393e105 | 7181 | complain, in_decl), |
558475f0 | 7182 | stmt); |
4393e105 | 7183 | tmp = tsubst_expr (FOR_EXPR (t), args, complain, in_decl); |
558475f0 | 7184 | finish_for_expr (tmp, stmt); |
4393e105 | 7185 | tsubst_expr (FOR_BODY (t), args, complain, in_decl); |
558475f0 | 7186 | finish_for_stmt (tmp, stmt); |
5566b478 MS |
7187 | } |
7188 | break; | |
8d08fdba | 7189 | |
5566b478 MS |
7190 | case WHILE_STMT: |
7191 | { | |
a7e4cfa0 | 7192 | prep_stmt (t); |
558475f0 | 7193 | stmt = begin_while_stmt (); |
ad321293 | 7194 | finish_while_stmt_cond (tsubst_expr (WHILE_COND (t), |
4393e105 | 7195 | args, complain, in_decl), |
558475f0 | 7196 | stmt); |
4393e105 | 7197 | tsubst_expr (WHILE_BODY (t), args, complain, in_decl); |
558475f0 | 7198 | finish_while_stmt (stmt); |
5566b478 MS |
7199 | } |
7200 | break; | |
8d08fdba | 7201 | |
5566b478 MS |
7202 | case DO_STMT: |
7203 | { | |
a7e4cfa0 | 7204 | prep_stmt (t); |
558475f0 | 7205 | stmt = begin_do_stmt (); |
4393e105 | 7206 | tsubst_expr (DO_BODY (t), args, complain, in_decl); |
558475f0 | 7207 | finish_do_body (stmt); |
ad321293 | 7208 | finish_do_stmt (tsubst_expr (DO_COND (t), args, |
4393e105 | 7209 | complain, in_decl), |
558475f0 | 7210 | stmt); |
5566b478 MS |
7211 | } |
7212 | break; | |
a0a33927 | 7213 | |
5566b478 | 7214 | case IF_STMT: |
8d08fdba | 7215 | { |
5566b478 | 7216 | tree tmp; |
5566b478 | 7217 | |
a7e4cfa0 | 7218 | prep_stmt (t); |
558475f0 | 7219 | stmt = begin_if_stmt (); |
ad321293 | 7220 | finish_if_stmt_cond (tsubst_expr (IF_COND (t), |
4393e105 | 7221 | args, complain, in_decl), |
558475f0 | 7222 | stmt); |
db5ae43f | 7223 | |
ad321293 | 7224 | if (tmp = THEN_CLAUSE (t), tmp) |
db5ae43f | 7225 | { |
4393e105 | 7226 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7227 | finish_then_clause (stmt); |
db5ae43f MS |
7228 | } |
7229 | ||
ad321293 MM |
7230 | if (tmp = ELSE_CLAUSE (t), tmp) |
7231 | { | |
7232 | begin_else_clause (); | |
4393e105 | 7233 | tsubst_expr (tmp, args, complain, in_decl); |
558475f0 | 7234 | finish_else_clause (stmt); |
ad321293 | 7235 | } |
8d08fdba | 7236 | |
ad321293 | 7237 | finish_if_stmt (); |
8d08fdba | 7238 | } |
5566b478 | 7239 | break; |
8d08fdba | 7240 | |
5566b478 MS |
7241 | case COMPOUND_STMT: |
7242 | { | |
ad321293 | 7243 | tree substmt; |
8d08fdba | 7244 | |
a7e4cfa0 | 7245 | prep_stmt (t); |
558475f0 | 7246 | stmt = begin_compound_stmt (COMPOUND_STMT_NO_SCOPE (t)); |
ad321293 MM |
7247 | for (substmt = COMPOUND_BODY (t); |
7248 | substmt != NULL_TREE; | |
7249 | substmt = TREE_CHAIN (substmt)) | |
4393e105 | 7250 | tsubst_expr (substmt, args, complain, in_decl); |
558475f0 | 7251 | return finish_compound_stmt (COMPOUND_STMT_NO_SCOPE (t), stmt); |
5566b478 MS |
7252 | } |
7253 | break; | |
8d08fdba | 7254 | |
5566b478 | 7255 | case BREAK_STMT: |
a7e4cfa0 | 7256 | prep_stmt (t); |
ad321293 | 7257 | finish_break_stmt (); |
5566b478 | 7258 | break; |
8d08fdba | 7259 | |
6467930b | 7260 | case CONTINUE_STMT: |
a7e4cfa0 | 7261 | prep_stmt (t); |
ad321293 | 7262 | finish_continue_stmt (); |
6467930b MS |
7263 | break; |
7264 | ||
5566b478 MS |
7265 | case SWITCH_STMT: |
7266 | { | |
558475f0 | 7267 | tree val; |
5566b478 | 7268 | |
a7e4cfa0 | 7269 | prep_stmt (t); |
527f0080 | 7270 | stmt = begin_switch_stmt (); |
4393e105 | 7271 | val = tsubst_expr (SWITCH_COND (t), args, complain, in_decl); |
527f0080 | 7272 | finish_switch_cond (val, stmt); |
558475f0 MM |
7273 | tsubst_expr (SWITCH_BODY (t), args, complain, in_decl); |
7274 | finish_switch_stmt (val, stmt); | |
5566b478 MS |
7275 | } |
7276 | break; | |
7277 | ||
7278 | case CASE_LABEL: | |
a7e4cfa0 | 7279 | prep_stmt (t); |
4393e105 MM |
7280 | finish_case_label (tsubst_expr (CASE_LOW (t), args, complain, in_decl), |
7281 | tsubst_expr (CASE_HIGH (t), args, complain, in_decl)); | |
5566b478 MS |
7282 | break; |
7283 | ||
acef433b MM |
7284 | case LABEL_STMT: |
7285 | lineno = STMT_LINENO (t); | |
7286 | finish_label_stmt (DECL_NAME (LABEL_STMT_LABEL (t))); | |
5566b478 MS |
7287 | break; |
7288 | ||
7289 | case GOTO_STMT: | |
a7e4cfa0 | 7290 | prep_stmt (t); |
aa09da44 | 7291 | t = GOTO_DESTINATION (t); |
3fa56191 | 7292 | if (TREE_CODE (t) != LABEL_DECL) |
aa09da44 MM |
7293 | /* Computed goto's must be tsubst'd into. On the other hand, |
7294 | non-computed gotos must not be; the identifier in question | |
7295 | will have no binding. */ | |
4393e105 | 7296 | t = tsubst_expr (t, args, complain, in_decl); |
3fa56191 MM |
7297 | else |
7298 | t = DECL_NAME (t); | |
aa09da44 | 7299 | finish_goto_stmt (t); |
ad321293 MM |
7300 | break; |
7301 | ||
7302 | case ASM_STMT: | |
a7e4cfa0 | 7303 | prep_stmt (t); |
3ebc5c52 | 7304 | finish_asm_stmt (ASM_CV_QUAL (t), |
4393e105 MM |
7305 | tsubst_expr (ASM_STRING (t), args, complain, in_decl), |
7306 | tsubst_expr (ASM_OUTPUTS (t), args, complain, in_decl), | |
7307 | tsubst_expr (ASM_INPUTS (t), args, complain, in_decl), | |
7308 | tsubst_expr (ASM_CLOBBERS (t), args, complain, | |
7309 | in_decl)); | |
5566b478 | 7310 | break; |
faf5394a MS |
7311 | |
7312 | case TRY_BLOCK: | |
a7e4cfa0 | 7313 | prep_stmt (t); |
f1dedc31 | 7314 | if (CLEANUP_P (t)) |
62409b39 | 7315 | { |
57b52417 | 7316 | stmt = begin_try_block (); |
62409b39 MM |
7317 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); |
7318 | finish_cleanup_try_block (stmt); | |
7319 | finish_cleanup (tsubst_expr (TRY_HANDLERS (t), args, | |
7320 | complain, in_decl), | |
7321 | stmt); | |
7322 | } | |
f1dedc31 MM |
7323 | else |
7324 | { | |
62409b39 MM |
7325 | tree handler; |
7326 | ||
7327 | if (FN_TRY_BLOCK_P (t)) | |
7328 | stmt = begin_function_try_block (); | |
7329 | else | |
7330 | stmt = begin_try_block (); | |
7331 | ||
7332 | tsubst_expr (TRY_STMTS (t), args, complain, in_decl); | |
7333 | ||
7334 | if (FN_TRY_BLOCK_P (t)) | |
7335 | finish_function_try_block (stmt); | |
7336 | else | |
7337 | finish_try_block (stmt); | |
7338 | ||
7339 | handler = TRY_HANDLERS (t); | |
f1dedc31 MM |
7340 | for (; handler; handler = TREE_CHAIN (handler)) |
7341 | tsubst_expr (handler, args, complain, in_decl); | |
84df082b MM |
7342 | if (FN_TRY_BLOCK_P (t)) |
7343 | finish_function_handler_sequence (stmt); | |
7344 | else | |
7345 | finish_handler_sequence (stmt); | |
f1dedc31 | 7346 | } |
faf5394a | 7347 | break; |
b35d4555 | 7348 | |
faf5394a | 7349 | case HANDLER: |
b35d4555 MM |
7350 | { |
7351 | tree decl; | |
7352 | tree blocks; | |
7353 | ||
7354 | prep_stmt (t); | |
7355 | stmt = begin_handler (); | |
7356 | if (HANDLER_PARMS (t)) | |
7357 | { | |
7358 | decl = DECL_STMT_DECL (HANDLER_PARMS (t)); | |
7359 | decl = tsubst (decl, args, complain, in_decl); | |
f8191e64 MM |
7360 | /* Prevent instantiate_decl from trying to instantiate |
7361 | this variable. We've already done all that needs to be | |
7362 | done. */ | |
7363 | DECL_TEMPLATE_INSTANTIATED (decl) = 1; | |
b35d4555 MM |
7364 | } |
7365 | else | |
7366 | decl = NULL_TREE; | |
7367 | blocks = finish_handler_parms (decl, stmt); | |
7368 | tsubst_expr (HANDLER_BODY (t), args, complain, in_decl); | |
7369 | finish_handler (blocks, stmt); | |
7370 | } | |
faf5394a MS |
7371 | break; |
7372 | ||
b87692e5 | 7373 | case TAG_DEFN: |
a7e4cfa0 | 7374 | prep_stmt (t); |
b87692e5 | 7375 | t = TREE_TYPE (t); |
ae673f14 | 7376 | tsubst (t, args, complain, NULL_TREE); |
b87692e5 MS |
7377 | break; |
7378 | ||
5566b478 | 7379 | default: |
4393e105 | 7380 | return build_expr_from_tree (tsubst_copy (t, args, complain, in_decl)); |
5566b478 MS |
7381 | } |
7382 | return NULL_TREE; | |
8d08fdba MS |
7383 | } |
7384 | ||
db9b2174 MM |
7385 | /* TMPL is a TEMPLATE_DECL for a cloned constructor or destructor. |
7386 | Instantiate it with the ARGS. */ | |
7387 | ||
7388 | static tree | |
7389 | instantiate_clone (tmpl, args) | |
7390 | tree tmpl; | |
7391 | tree args; | |
7392 | { | |
7393 | tree spec; | |
7394 | tree clone; | |
7395 | ||
7396 | /* Instantiated the cloned function, rather than the clone. */ | |
7397 | spec = instantiate_template (DECL_CLONED_FUNCTION (tmpl), args); | |
7398 | ||
7399 | /* Then, see if we've already cloned the instantiation. */ | |
7400 | for (clone = TREE_CHAIN (spec); | |
7401 | clone && DECL_CLONED_FUNCTION_P (clone); | |
7402 | clone = TREE_CHAIN (clone)) | |
7403 | if (DECL_NAME (clone) == DECL_NAME (tmpl)) | |
7404 | return clone; | |
7405 | ||
7406 | /* If we haven't, do so know. */ | |
7407 | if (!clone) | |
7408 | clone_function_decl (spec, /*update_method_vec_p=*/0); | |
7409 | ||
7410 | /* Look again. */ | |
7411 | for (clone = TREE_CHAIN (spec); | |
7412 | clone && DECL_CLONED_FUNCTION_P (clone); | |
7413 | clone = TREE_CHAIN (clone)) | |
7414 | if (DECL_NAME (clone) == DECL_NAME (tmpl)) | |
7415 | return clone; | |
7416 | ||
7417 | /* We should always have found the clone by now. */ | |
7418 | my_friendly_abort (20000411); | |
7419 | return NULL_TREE; | |
7420 | } | |
7421 | ||
6ba89f8e | 7422 | /* Instantiate the indicated variable or function template TMPL with |
36a117a5 MM |
7423 | the template arguments in TARG_PTR. */ |
7424 | ||
5566b478 MS |
7425 | tree |
7426 | instantiate_template (tmpl, targ_ptr) | |
98c1c668 | 7427 | tree tmpl, targ_ptr; |
8d08fdba | 7428 | { |
5566b478 | 7429 | tree fndecl; |
36a117a5 MM |
7430 | tree gen_tmpl; |
7431 | tree spec; | |
5566b478 | 7432 | int i, len; |
36a117a5 | 7433 | tree inner_args; |
5566b478 | 7434 | |
27fafc8d JM |
7435 | if (tmpl == error_mark_node) |
7436 | return error_mark_node; | |
7437 | ||
386b8a85 JM |
7438 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 283); |
7439 | ||
db9b2174 MM |
7440 | /* If this function is a clone, handle it specially. */ |
7441 | if (DECL_CLONED_FUNCTION_P (tmpl)) | |
7442 | return instantiate_clone (tmpl, targ_ptr); | |
7443 | ||
36a117a5 MM |
7444 | /* Check to see if we already have this specialization. */ |
7445 | spec = retrieve_specialization (tmpl, targ_ptr); | |
7446 | if (spec != NULL_TREE) | |
7447 | return spec; | |
7448 | ||
74b846e0 | 7449 | if (DECL_TEMPLATE_INFO (tmpl) && !DECL_TEMPLATE_SPECIALIZATION (tmpl)) |
386b8a85 | 7450 | { |
36a117a5 MM |
7451 | /* The TMPL is a partial instantiation. To get a full set of |
7452 | arguments we must add the arguments used to perform the | |
7453 | partial instantiation. */ | |
7454 | targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl), | |
7455 | targ_ptr); | |
7456 | gen_tmpl = most_general_template (tmpl); | |
7457 | ||
7458 | /* Check to see if we already have this specialization. */ | |
7459 | spec = retrieve_specialization (gen_tmpl, targ_ptr); | |
75650646 MM |
7460 | if (spec != NULL_TREE) |
7461 | return spec; | |
386b8a85 | 7462 | } |
36a117a5 MM |
7463 | else |
7464 | gen_tmpl = tmpl; | |
386b8a85 | 7465 | |
36a117a5 MM |
7466 | len = DECL_NTPARMS (gen_tmpl); |
7467 | inner_args = innermost_args (targ_ptr); | |
5566b478 MS |
7468 | i = len; |
7469 | while (i--) | |
8d08fdba | 7470 | { |
36a117a5 | 7471 | tree t = TREE_VEC_ELT (inner_args, i); |
2f939d94 | 7472 | if (TYPE_P (t)) |
5566b478 MS |
7473 | { |
7474 | tree nt = target_type (t); | |
ec255269 | 7475 | if (IS_AGGR_TYPE (nt) && decl_function_context (TYPE_MAIN_DECL (nt))) |
5566b478 | 7476 | { |
8251199e JM |
7477 | cp_error ("type `%T' composed from a local class is not a valid template-argument", t); |
7478 | cp_error (" trying to instantiate `%D'", gen_tmpl); | |
454fa7a7 | 7479 | return error_mark_node; |
5566b478 MS |
7480 | } |
7481 | } | |
8d08fdba MS |
7482 | } |
7483 | ||
5566b478 | 7484 | /* substitute template parameters */ |
17aec3eb RK |
7485 | fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl), |
7486 | targ_ptr, /*complain=*/1, gen_tmpl); | |
36a117a5 MM |
7487 | /* The DECL_TI_TEMPLATE should always be the immediate parent |
7488 | template, not the most general template. */ | |
7489 | DECL_TI_TEMPLATE (fndecl) = tmpl; | |
8d08fdba | 7490 | |
824b9a4c MS |
7491 | if (flag_external_templates) |
7492 | add_pending_template (fndecl); | |
7493 | ||
5566b478 | 7494 | return fndecl; |
8d08fdba | 7495 | } |
5566b478 MS |
7496 | |
7497 | /* Push the name of the class template into the scope of the instantiation. */ | |
8d08fdba MS |
7498 | |
7499 | void | |
5566b478 MS |
7500 | overload_template_name (type) |
7501 | tree type; | |
8d08fdba | 7502 | { |
5566b478 MS |
7503 | tree id = DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)); |
7504 | tree decl; | |
8d08fdba | 7505 | |
5566b478 MS |
7506 | if (IDENTIFIER_CLASS_VALUE (id) |
7507 | && TREE_TYPE (IDENTIFIER_CLASS_VALUE (id)) == type) | |
7508 | return; | |
8d08fdba | 7509 | |
5566b478 MS |
7510 | decl = build_decl (TYPE_DECL, id, type); |
7511 | SET_DECL_ARTIFICIAL (decl); | |
7512 | pushdecl_class_level (decl); | |
8d08fdba MS |
7513 | } |
7514 | ||
4393e105 MM |
7515 | /* The FN is a TEMPLATE_DECL for a function. The ARGS are the |
7516 | arguments that are being used when calling it. TARGS is a vector | |
7517 | into which the deduced template arguments are placed. | |
8d08fdba MS |
7518 | |
7519 | Return zero for success, 2 for an incomplete match that doesn't resolve | |
7520 | all the types, and 1 for complete failure. An error message will be | |
7521 | printed only for an incomplete match. | |
7522 | ||
4393e105 MM |
7523 | If FN is a conversion operator, RETURN_TYPE is the type desired as |
7524 | the result of the conversion operator. | |
8d08fdba | 7525 | |
4393e105 | 7526 | TPARMS is a vector of template parameters. |
9f54c803 MM |
7527 | |
7528 | The EXPLICIT_TARGS are explicit template arguments provided via a | |
7529 | template-id. | |
6467930b | 7530 | |
830bfa74 MM |
7531 | The parameter STRICT is one of: |
7532 | ||
7533 | DEDUCE_CALL: | |
7534 | We are deducing arguments for a function call, as in | |
7535 | [temp.deduct.call]. | |
7536 | ||
7537 | DEDUCE_CONV: | |
7538 | We are deducing arguments for a conversion function, as in | |
7539 | [temp.deduct.conv]. | |
7540 | ||
7541 | DEDUCE_EXACT: | |
7542 | We are deducing arguments when calculating the partial | |
7543 | ordering between specializations of function or class | |
7544 | templates, as in [temp.func.order] and [temp.class.order], | |
7545 | when doing an explicit instantiation as in [temp.explicit], | |
9f54c803 | 7546 | when determining an explicit specialization as in |
830bfa74 | 7547 | [temp.expl.spec], or when taking the address of a function |
4393e105 MM |
7548 | template, as in [temp.deduct.funcaddr]. |
7549 | ||
4393e105 | 7550 | The other arguments are as for type_unification. */ |
8d08fdba MS |
7551 | |
7552 | int | |
4393e105 | 7553 | fn_type_unification (fn, explicit_targs, targs, args, return_type, |
03017874 | 7554 | strict) |
4393e105 | 7555 | tree fn, explicit_targs, targs, args, return_type; |
830bfa74 | 7556 | unification_kind_t strict; |
386b8a85 | 7557 | { |
4393e105 MM |
7558 | tree parms; |
7559 | tree fntype; | |
adecb3f4 | 7560 | int result; |
386b8a85 | 7561 | |
4393e105 MM |
7562 | my_friendly_assert (TREE_CODE (fn) == TEMPLATE_DECL, 0); |
7563 | ||
7564 | fntype = TREE_TYPE (fn); | |
7565 | if (explicit_targs) | |
75650646 | 7566 | { |
4393e105 MM |
7567 | /* [temp.deduct] |
7568 | ||
7569 | The specified template arguments must match the template | |
7570 | parameters in kind (i.e., type, nontype, template), and there | |
7571 | must not be more arguments than there are parameters; | |
7572 | otherwise type deduction fails. | |
7573 | ||
7574 | Nontype arguments must match the types of the corresponding | |
7575 | nontype template parameters, or must be convertible to the | |
7576 | types of the corresponding nontype parameters as specified in | |
7577 | _temp.arg.nontype_, otherwise type deduction fails. | |
7578 | ||
7579 | All references in the function type of the function template | |
7580 | to the corresponding template parameters are replaced by the | |
7581 | specified template argument values. If a substitution in a | |
7582 | template parameter or in the function type of the function | |
7583 | template results in an invalid type, type deduction fails. */ | |
7584 | int i; | |
7585 | tree converted_args; | |
75650646 | 7586 | |
4393e105 MM |
7587 | converted_args |
7588 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn), | |
7589 | explicit_targs, NULL_TREE, /*complain=*/0, | |
7590 | /*require_all_arguments=*/0)); | |
7591 | if (converted_args == error_mark_node) | |
75650646 | 7592 | return 1; |
386b8a85 | 7593 | |
4393e105 MM |
7594 | fntype = tsubst (fntype, converted_args, /*complain=*/0, NULL_TREE); |
7595 | if (fntype == error_mark_node) | |
7596 | return 1; | |
050367a3 | 7597 | |
4393e105 MM |
7598 | /* Place the explicitly specified arguments in TARGS. */ |
7599 | for (i = 0; i < TREE_VEC_LENGTH (targs); i++) | |
7600 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (converted_args, i); | |
75650646 | 7601 | } |
4393e105 MM |
7602 | |
7603 | parms = TYPE_ARG_TYPES (fntype); | |
386b8a85 | 7604 | |
4393e105 MM |
7605 | if (DECL_CONV_FN_P (fn)) |
7606 | { | |
8d3631f8 | 7607 | /* This is a template conversion operator. Remove `this', since |
edef8288 | 7608 | we could be comparing conversions from different classes. */ |
8d3631f8 NS |
7609 | parms = TREE_CHAIN (parms); |
7610 | args = TREE_CHAIN (args); | |
7611 | my_friendly_assert (return_type != NULL_TREE, 20000227); | |
7612 | } | |
7613 | ||
7614 | if (return_type) | |
7615 | { | |
7616 | /* We've been given a return type to match, prepend it. */ | |
7617 | parms = tree_cons (NULL_TREE, TREE_TYPE (fntype), parms); | |
7618 | args = tree_cons (NULL_TREE, return_type, args); | |
4393e105 MM |
7619 | } |
7620 | ||
4393e105 MM |
7621 | /* We allow incomplete unification without an error message here |
7622 | because the standard doesn't seem to explicitly prohibit it. Our | |
7623 | callers must be ready to deal with unification failures in any | |
7624 | event. */ | |
adecb3f4 MM |
7625 | result = type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn), |
7626 | targs, parms, args, /*subr=*/0, | |
7627 | strict, /*allow_incomplete*/1); | |
7628 | ||
7629 | if (result == 0) | |
7630 | /* All is well so far. Now, check: | |
7631 | ||
7632 | [temp.deduct] | |
7633 | ||
7634 | When all template arguments have been deduced, all uses of | |
7635 | template parameters in nondeduced contexts are replaced with | |
7636 | the corresponding deduced argument values. If the | |
7637 | substitution results in an invalid type, as described above, | |
7638 | type deduction fails. */ | |
7639 | if (tsubst (TREE_TYPE (fn), targs, /*complain=*/0, NULL_TREE) | |
7640 | == error_mark_node) | |
7641 | return 1; | |
7642 | ||
7643 | return result; | |
830bfa74 MM |
7644 | } |
7645 | ||
7646 | /* Adjust types before performing type deduction, as described in | |
7647 | [temp.deduct.call] and [temp.deduct.conv]. The rules in these two | |
4c7d0dff MM |
7648 | sections are symmetric. PARM is the type of a function parameter |
7649 | or the return type of the conversion function. ARG is the type of | |
7650 | the argument passed to the call, or the type of the value | |
7651 | intialized with the result of the conversion function. */ | |
386b8a85 | 7652 | |
e9659ab0 | 7653 | static void |
830bfa74 MM |
7654 | maybe_adjust_types_for_deduction (strict, parm, arg) |
7655 | unification_kind_t strict; | |
7656 | tree* parm; | |
7657 | tree* arg; | |
7658 | { | |
7659 | switch (strict) | |
7660 | { | |
7661 | case DEDUCE_CALL: | |
7662 | break; | |
7663 | ||
7664 | case DEDUCE_CONV: | |
7665 | { | |
4c7d0dff MM |
7666 | /* Swap PARM and ARG throughout the remainder of this |
7667 | function; the handling is precisely symmetric since PARM | |
7668 | will initialize ARG rather than vice versa. */ | |
830bfa74 MM |
7669 | tree* temp = parm; |
7670 | parm = arg; | |
7671 | arg = temp; | |
7672 | break; | |
7673 | } | |
7674 | ||
7675 | case DEDUCE_EXACT: | |
7676 | /* There is nothing to do in this case. */ | |
7677 | return; | |
7678 | ||
7679 | default: | |
7680 | my_friendly_abort (0); | |
7681 | } | |
7682 | ||
7683 | if (TREE_CODE (*parm) != REFERENCE_TYPE) | |
7684 | { | |
7685 | /* [temp.deduct.call] | |
7686 | ||
7687 | If P is not a reference type: | |
7688 | ||
7689 | --If A is an array type, the pointer type produced by the | |
7690 | array-to-pointer standard conversion (_conv.array_) is | |
7691 | used in place of A for type deduction; otherwise, | |
7692 | ||
7693 | --If A is a function type, the pointer type produced by | |
7694 | the function-to-pointer standard conversion | |
7695 | (_conv.func_) is used in place of A for type deduction; | |
7696 | otherwise, | |
7697 | ||
7698 | --If A is a cv-qualified type, the top level | |
7699 | cv-qualifiers of A's type are ignored for type | |
7700 | deduction. */ | |
7701 | if (TREE_CODE (*arg) == ARRAY_TYPE) | |
7702 | *arg = build_pointer_type (TREE_TYPE (*arg)); | |
d8f8dca1 | 7703 | else if (TREE_CODE (*arg) == FUNCTION_TYPE) |
830bfa74 MM |
7704 | *arg = build_pointer_type (*arg); |
7705 | else | |
7706 | *arg = TYPE_MAIN_VARIANT (*arg); | |
7707 | } | |
7708 | ||
7709 | /* [temp.deduct.call] | |
7710 | ||
7711 | If P is a cv-qualified type, the top level cv-qualifiers | |
7712 | of P's type are ignored for type deduction. If P is a | |
7713 | reference type, the type referred to by P is used for | |
7714 | type deduction. */ | |
7715 | *parm = TYPE_MAIN_VARIANT (*parm); | |
7716 | if (TREE_CODE (*parm) == REFERENCE_TYPE) | |
7717 | *parm = TREE_TYPE (*parm); | |
386b8a85 JM |
7718 | } |
7719 | ||
4393e105 | 7720 | /* Like type_unfication. |
9f54c803 MM |
7721 | |
7722 | If SUBR is 1, we're being called recursively (to unify the | |
7723 | arguments of a function or method parameter of a function | |
7724 | template). */ | |
386b8a85 | 7725 | |
4966381a | 7726 | static int |
3b3ba9f0 | 7727 | type_unification_real (tparms, targs, parms, args, subr, |
4393e105 | 7728 | strict, allow_incomplete) |
050367a3 | 7729 | tree tparms, targs, parms, args; |
830bfa74 MM |
7730 | int subr; |
7731 | unification_kind_t strict; | |
7732 | int allow_incomplete; | |
8d08fdba MS |
7733 | { |
7734 | tree parm, arg; | |
7735 | int i; | |
7736 | int ntparms = TREE_VEC_LENGTH (tparms); | |
830bfa74 | 7737 | int sub_strict; |
8d08fdba MS |
7738 | |
7739 | my_friendly_assert (TREE_CODE (tparms) == TREE_VEC, 289); | |
386b8a85 JM |
7740 | my_friendly_assert (parms == NULL_TREE |
7741 | || TREE_CODE (parms) == TREE_LIST, 290); | |
51c184be | 7742 | /* ARGS could be NULL (via a call from parse.y to |
8d08fdba MS |
7743 | build_x_function_call). */ |
7744 | if (args) | |
7745 | my_friendly_assert (TREE_CODE (args) == TREE_LIST, 291); | |
7746 | my_friendly_assert (ntparms > 0, 292); | |
7747 | ||
830bfa74 MM |
7748 | switch (strict) |
7749 | { | |
7750 | case DEDUCE_CALL: | |
7751 | sub_strict = UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_DERIVED; | |
7752 | break; | |
7753 | ||
7754 | case DEDUCE_CONV: | |
7755 | sub_strict = UNIFY_ALLOW_LESS_CV_QUAL; | |
7756 | break; | |
7757 | ||
7758 | case DEDUCE_EXACT: | |
7759 | sub_strict = UNIFY_ALLOW_NONE; | |
7760 | break; | |
7761 | ||
7762 | default: | |
7763 | my_friendly_abort (0); | |
7764 | } | |
7765 | ||
8d08fdba MS |
7766 | while (parms |
7767 | && parms != void_list_node | |
7768 | && args | |
7769 | && args != void_list_node) | |
7770 | { | |
7771 | parm = TREE_VALUE (parms); | |
7772 | parms = TREE_CHAIN (parms); | |
7773 | arg = TREE_VALUE (args); | |
7774 | args = TREE_CHAIN (args); | |
7775 | ||
7776 | if (arg == error_mark_node) | |
7777 | return 1; | |
7778 | if (arg == unknown_type_node) | |
34016c81 JM |
7779 | /* We can't deduce anything from this, but we might get all the |
7780 | template args from other function args. */ | |
7781 | continue; | |
b7484fbe | 7782 | |
03e70705 JM |
7783 | /* Conversions will be performed on a function argument that |
7784 | corresponds with a function parameter that contains only | |
7785 | non-deducible template parameters and explicitly specified | |
7786 | template parameters. */ | |
7787 | if (! uses_template_parms (parm)) | |
b7484fbe | 7788 | { |
03e70705 JM |
7789 | tree type; |
7790 | ||
2f939d94 | 7791 | if (!TYPE_P (arg)) |
03e70705 JM |
7792 | type = TREE_TYPE (arg); |
7793 | else | |
7794 | { | |
7795 | type = arg; | |
7796 | arg = NULL_TREE; | |
7797 | } | |
7798 | ||
830bfa74 | 7799 | if (strict == DEDUCE_EXACT) |
03e70705 | 7800 | { |
3bfdc719 | 7801 | if (same_type_p (parm, type)) |
03e70705 JM |
7802 | continue; |
7803 | } | |
03e70705 | 7804 | else |
343c89cd JM |
7805 | /* It might work; we shouldn't check now, because we might |
7806 | get into infinite recursion. Overload resolution will | |
7807 | handle it. */ | |
7808 | continue; | |
03e70705 | 7809 | |
b7484fbe MS |
7810 | return 1; |
7811 | } | |
7812 | ||
2f939d94 | 7813 | if (!TYPE_P (arg)) |
8d08fdba MS |
7814 | { |
7815 | my_friendly_assert (TREE_TYPE (arg) != NULL_TREE, 293); | |
34016c81 | 7816 | if (type_unknown_p (arg)) |
28cbf42c | 7817 | { |
34016c81 JM |
7818 | /* [temp.deduct.type] A template-argument can be deduced from |
7819 | a pointer to function or pointer to member function | |
7820 | argument if the set of overloaded functions does not | |
7821 | contain function templates and at most one of a set of | |
7822 | overloaded functions provides a unique match. */ | |
7823 | ||
7824 | if (resolve_overloaded_unification | |
4393e105 | 7825 | (tparms, targs, parm, arg, strict, sub_strict) |
34016c81 JM |
7826 | != 0) |
7827 | return 1; | |
7828 | continue; | |
28cbf42c | 7829 | } |
8d08fdba MS |
7830 | arg = TREE_TYPE (arg); |
7831 | } | |
4393e105 | 7832 | |
830bfa74 MM |
7833 | if (!subr) |
7834 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
db5ae43f | 7835 | |
4393e105 | 7836 | switch (unify (tparms, targs, parm, arg, sub_strict)) |
8d08fdba MS |
7837 | { |
7838 | case 0: | |
7839 | break; | |
7840 | case 1: | |
7841 | return 1; | |
7842 | } | |
7843 | } | |
7844 | /* Fail if we've reached the end of the parm list, and more args | |
7845 | are present, and the parm list isn't variadic. */ | |
7846 | if (args && args != void_list_node && parms == void_list_node) | |
7847 | return 1; | |
7848 | /* Fail if parms are left and they don't have default values. */ | |
7849 | if (parms | |
7850 | && parms != void_list_node | |
7851 | && TREE_PURPOSE (parms) == NULL_TREE) | |
7852 | return 1; | |
7853 | if (!subr) | |
7854 | for (i = 0; i < ntparms; i++) | |
050367a3 | 7855 | if (TREE_VEC_ELT (targs, i) == NULL_TREE) |
8d08fdba | 7856 | { |
386b8a85 | 7857 | if (!allow_incomplete) |
8251199e | 7858 | error ("incomplete type unification"); |
8d08fdba MS |
7859 | return 2; |
7860 | } | |
7861 | return 0; | |
7862 | } | |
7863 | ||
34016c81 JM |
7864 | /* Subroutine of type_unification_real. Args are like the variables at the |
7865 | call site. ARG is an overloaded function (or template-id); we try | |
7866 | deducing template args from each of the overloads, and if only one | |
7867 | succeeds, we go with that. Modifies TARGS and returns 0 on success. */ | |
7868 | ||
7869 | static int | |
7870 | resolve_overloaded_unification (tparms, targs, parm, arg, strict, | |
4393e105 | 7871 | sub_strict) |
34016c81 JM |
7872 | tree tparms, targs, parm, arg; |
7873 | unification_kind_t strict; | |
7874 | int sub_strict; | |
34016c81 JM |
7875 | { |
7876 | tree tempargs = copy_node (targs); | |
7877 | int good = 0; | |
7878 | ||
7879 | if (TREE_CODE (arg) == ADDR_EXPR) | |
7880 | arg = TREE_OPERAND (arg, 0); | |
9f3d9e46 | 7881 | |
d8f8dca1 MM |
7882 | if (TREE_CODE (arg) == COMPONENT_REF) |
7883 | /* Handle `&x' where `x' is some static or non-static member | |
7884 | function name. */ | |
7885 | arg = TREE_OPERAND (arg, 1); | |
7886 | ||
05e0b2f4 JM |
7887 | if (TREE_CODE (arg) == OFFSET_REF) |
7888 | arg = TREE_OPERAND (arg, 1); | |
7889 | ||
9f3d9e46 JM |
7890 | /* Strip baselink information. */ |
7891 | while (TREE_CODE (arg) == TREE_LIST) | |
7892 | arg = TREE_VALUE (arg); | |
7893 | ||
34016c81 JM |
7894 | if (TREE_CODE (arg) == TEMPLATE_ID_EXPR) |
7895 | { | |
7896 | /* If we got some explicit template args, we need to plug them into | |
7897 | the affected templates before we try to unify, in case the | |
7898 | explicit args will completely resolve the templates in question. */ | |
7899 | ||
7900 | tree expl_subargs = TREE_OPERAND (arg, 1); | |
7901 | arg = TREE_OPERAND (arg, 0); | |
7902 | ||
7903 | for (; arg; arg = OVL_NEXT (arg)) | |
7904 | { | |
7905 | tree fn = OVL_CURRENT (arg); | |
7906 | tree subargs, elem; | |
7907 | ||
7908 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
7909 | continue; | |
7910 | ||
17aec3eb RK |
7911 | subargs = get_bindings_overload (fn, DECL_TEMPLATE_RESULT (fn), |
7912 | expl_subargs); | |
34016c81 JM |
7913 | if (subargs) |
7914 | { | |
4393e105 MM |
7915 | elem = tsubst (TREE_TYPE (fn), subargs, /*complain=*/0, |
7916 | NULL_TREE); | |
d8f8dca1 MM |
7917 | if (TREE_CODE (elem) == METHOD_TYPE) |
7918 | elem = build_ptrmemfunc_type (build_pointer_type (elem)); | |
e97e5263 | 7919 | good += try_one_overload (tparms, targs, tempargs, parm, elem, |
4393e105 | 7920 | strict, sub_strict); |
34016c81 JM |
7921 | } |
7922 | } | |
7923 | } | |
7924 | else if (TREE_CODE (arg) == OVERLOAD) | |
7925 | { | |
7926 | for (; arg; arg = OVL_NEXT (arg)) | |
d8f8dca1 MM |
7927 | { |
7928 | tree type = TREE_TYPE (OVL_CURRENT (arg)); | |
7929 | if (TREE_CODE (type) == METHOD_TYPE) | |
7930 | type = build_ptrmemfunc_type (build_pointer_type (type)); | |
7931 | good += try_one_overload (tparms, targs, tempargs, parm, | |
7932 | type, | |
4393e105 | 7933 | strict, sub_strict); |
d8f8dca1 | 7934 | } |
34016c81 JM |
7935 | } |
7936 | else | |
7937 | my_friendly_abort (981006); | |
7938 | ||
7939 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
7940 | to function or pointer to member function argument if the set of | |
7941 | overloaded functions does not contain function templates and at most | |
7942 | one of a set of overloaded functions provides a unique match. | |
7943 | ||
7944 | So if we found multiple possibilities, we return success but don't | |
7945 | deduce anything. */ | |
7946 | ||
7947 | if (good == 1) | |
7948 | { | |
7949 | int i = TREE_VEC_LENGTH (targs); | |
7950 | for (; i--; ) | |
7951 | if (TREE_VEC_ELT (tempargs, i)) | |
7952 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i); | |
7953 | } | |
7954 | if (good) | |
7955 | return 0; | |
7956 | ||
7957 | return 1; | |
7958 | } | |
7959 | ||
7960 | /* Subroutine of resolve_overloaded_unification; does deduction for a single | |
7961 | overload. Fills TARGS with any deduced arguments, or error_mark_node if | |
7962 | different overloads deduce different arguments for a given parm. | |
7963 | Returns 1 on success. */ | |
7964 | ||
7965 | static int | |
e97e5263 | 7966 | try_one_overload (tparms, orig_targs, targs, parm, arg, strict, |
4393e105 | 7967 | sub_strict) |
e97e5263 | 7968 | tree tparms, orig_targs, targs, parm, arg; |
34016c81 JM |
7969 | unification_kind_t strict; |
7970 | int sub_strict; | |
34016c81 JM |
7971 | { |
7972 | int nargs; | |
7973 | tree tempargs; | |
7974 | int i; | |
7975 | ||
7976 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
7977 | to function or pointer to member function argument if the set of | |
7978 | overloaded functions does not contain function templates and at most | |
7979 | one of a set of overloaded functions provides a unique match. | |
7980 | ||
7981 | So if this is a template, just return success. */ | |
7982 | ||
7983 | if (uses_template_parms (arg)) | |
7984 | return 1; | |
7985 | ||
7986 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
7987 | ||
7988 | /* We don't copy orig_targs for this because if we have already deduced | |
7989 | some template args from previous args, unify would complain when we | |
7990 | try to deduce a template parameter for the same argument, even though | |
7991 | there isn't really a conflict. */ | |
7992 | nargs = TREE_VEC_LENGTH (targs); | |
f31c0a32 | 7993 | tempargs = make_tree_vec (nargs); |
34016c81 | 7994 | |
4393e105 | 7995 | if (unify (tparms, tempargs, parm, arg, sub_strict) != 0) |
34016c81 JM |
7996 | return 0; |
7997 | ||
7998 | /* First make sure we didn't deduce anything that conflicts with | |
e97e5263 | 7999 | explicitly specified args. */ |
34016c81 JM |
8000 | for (i = nargs; i--; ) |
8001 | { | |
8002 | tree elt = TREE_VEC_ELT (tempargs, i); | |
e97e5263 | 8003 | tree oldelt = TREE_VEC_ELT (orig_targs, i); |
34016c81 JM |
8004 | |
8005 | if (elt == NULL_TREE) | |
8006 | continue; | |
8007 | else if (uses_template_parms (elt)) | |
8008 | { | |
8009 | /* Since we're unifying against ourselves, we will fill in template | |
8010 | args used in the function parm list with our own template parms. | |
8011 | Discard them. */ | |
8012 | TREE_VEC_ELT (tempargs, i) = NULL_TREE; | |
8013 | continue; | |
8014 | } | |
8015 | else if (oldelt && ! template_args_equal (oldelt, elt)) | |
8016 | return 0; | |
8017 | } | |
8018 | ||
8019 | for (i = nargs; i--; ) | |
8020 | { | |
8021 | tree elt = TREE_VEC_ELT (tempargs, i); | |
8022 | ||
8023 | if (elt) | |
8024 | TREE_VEC_ELT (targs, i) = elt; | |
8025 | } | |
8026 | ||
8027 | return 1; | |
8028 | } | |
8029 | ||
4393e105 MM |
8030 | /* PARM is a template class (perhaps with unbound template |
8031 | parameters). ARG is a fully instantiated type. If ARG can be | |
8032 | bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and | |
8033 | TARGS are as for unify. */ | |
fcfb9f96 MM |
8034 | |
8035 | static tree | |
4393e105 | 8036 | try_class_unification (tparms, targs, parm, arg) |
fcfb9f96 MM |
8037 | tree tparms; |
8038 | tree targs; | |
4393e105 MM |
8039 | tree parm; |
8040 | tree arg; | |
8041 | { | |
8042 | int i; | |
8043 | tree copy_of_targs; | |
8044 | ||
8045 | if (!CLASSTYPE_TEMPLATE_INFO (arg) | |
8046 | || CLASSTYPE_TI_TEMPLATE (arg) != CLASSTYPE_TI_TEMPLATE (parm)) | |
8047 | return NULL_TREE; | |
8048 | ||
8049 | /* We need to make a new template argument vector for the call to | |
8050 | unify. If we used TARGS, we'd clutter it up with the result of | |
8051 | the attempted unification, even if this class didn't work out. | |
8052 | We also don't want to commit ourselves to all the unifications | |
8053 | we've already done, since unification is supposed to be done on | |
8054 | an argument-by-argument basis. In other words, consider the | |
8055 | following pathological case: | |
8056 | ||
8057 | template <int I, int J, int K> | |
8058 | struct S {}; | |
8059 | ||
8060 | template <int I, int J> | |
8061 | struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {}; | |
8062 | ||
8063 | template <int I, int J, int K> | |
8064 | void f(S<I, J, K>, S<I, I, I>); | |
8065 | ||
8066 | void g() { | |
8067 | S<0, 0, 0> s0; | |
8068 | S<0, 1, 2> s2; | |
8069 | ||
8070 | f(s0, s2); | |
8071 | } | |
8072 | ||
8073 | Now, by the time we consider the unification involving `s2', we | |
8074 | already know that we must have `f<0, 0, 0>'. But, even though | |
8075 | `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is not legal | |
8076 | because there are two ways to unify base classes of S<0, 1, 2> | |
8077 | with S<I, I, I>. If we kept the already deduced knowledge, we | |
8078 | would reject the possibility I=1. */ | |
f31c0a32 | 8079 | copy_of_targs = make_tree_vec (TREE_VEC_LENGTH (targs)); |
4393e105 MM |
8080 | i = unify (tparms, copy_of_targs, CLASSTYPE_TI_ARGS (parm), |
8081 | CLASSTYPE_TI_ARGS (arg), UNIFY_ALLOW_NONE); | |
4393e105 MM |
8082 | |
8083 | /* If unification failed, we're done. */ | |
8084 | if (i != 0) | |
8085 | return NULL_TREE; | |
8086 | else | |
8087 | return arg; | |
8088 | } | |
8089 | ||
8090 | /* Subroutine of get_template_base. RVAL, if non-NULL, is a base we | |
8091 | have alreay discovered to be satisfactory. ARG_BINFO is the binfo | |
8092 | for the base class of ARG that we are currently examining. */ | |
8093 | ||
8094 | static tree | |
8095 | get_template_base_recursive (tparms, targs, parm, | |
8096 | arg_binfo, rval, flags) | |
8097 | tree tparms; | |
8098 | tree targs; | |
8099 | tree arg_binfo; | |
fcfb9f96 | 8100 | tree rval; |
4393e105 MM |
8101 | tree parm; |
8102 | int flags; | |
fcfb9f96 MM |
8103 | { |
8104 | tree binfos; | |
8105 | int i, n_baselinks; | |
4393e105 | 8106 | tree arg = BINFO_TYPE (arg_binfo); |
fcfb9f96 | 8107 | |
4393e105 | 8108 | if (!(flags & GTB_IGNORE_TYPE)) |
fcfb9f96 | 8109 | { |
4393e105 MM |
8110 | tree r = try_class_unification (tparms, targs, |
8111 | parm, arg); | |
fcfb9f96 | 8112 | |
4393e105 | 8113 | /* If there is more than one satisfactory baseclass, then: |
fcfb9f96 | 8114 | |
4393e105 MM |
8115 | [temp.deduct.call] |
8116 | ||
8117 | If they yield more than one possible deduced A, the type | |
8118 | deduction fails. | |
8119 | ||
8120 | applies. */ | |
8121 | if (r && rval && !same_type_p (r, rval)) | |
8122 | return error_mark_node; | |
8123 | else if (r) | |
8124 | rval = r; | |
fcfb9f96 MM |
8125 | } |
8126 | ||
4393e105 | 8127 | binfos = BINFO_BASETYPES (arg_binfo); |
fcfb9f96 MM |
8128 | n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0; |
8129 | ||
8130 | /* Process base types. */ | |
8131 | for (i = 0; i < n_baselinks; i++) | |
8132 | { | |
8133 | tree base_binfo = TREE_VEC_ELT (binfos, i); | |
4393e105 | 8134 | int this_virtual; |
fcfb9f96 | 8135 | |
4393e105 MM |
8136 | /* Skip this base, if we've already seen it. */ |
8137 | if (BINFO_MARKED (base_binfo)) | |
8138 | continue; | |
8139 | ||
8140 | this_virtual = | |
8141 | (flags & GTB_VIA_VIRTUAL) || TREE_VIA_VIRTUAL (base_binfo); | |
8142 | ||
8143 | /* When searching for a non-virtual, we cannot mark virtually | |
8144 | found binfos. */ | |
8145 | if (! this_virtual) | |
8146 | SET_BINFO_MARKED (base_binfo); | |
8147 | ||
8148 | rval = get_template_base_recursive (tparms, targs, | |
8149 | parm, | |
8150 | base_binfo, | |
8151 | rval, | |
8152 | GTB_VIA_VIRTUAL * this_virtual); | |
8153 | ||
8154 | /* If we discovered more than one matching base class, we can | |
8155 | stop now. */ | |
8156 | if (rval == error_mark_node) | |
8157 | return error_mark_node; | |
fcfb9f96 MM |
8158 | } |
8159 | ||
8160 | return rval; | |
8161 | } | |
8162 | ||
4393e105 MM |
8163 | /* Given a template type PARM and a class type ARG, find the unique |
8164 | base type in ARG that is an instance of PARM. We do not examine | |
8165 | ARG itself; only its base-classes. If there is no appropriate base | |
8166 | class, return NULL_TREE. If there is more than one, return | |
8167 | error_mark_node. PARM may be the type of a partial specialization, | |
8168 | as well as a plain template type. Used by unify. */ | |
fcfb9f96 MM |
8169 | |
8170 | static tree | |
4393e105 | 8171 | get_template_base (tparms, targs, parm, arg) |
fcfb9f96 MM |
8172 | tree tparms; |
8173 | tree targs; | |
4393e105 MM |
8174 | tree parm; |
8175 | tree arg; | |
fcfb9f96 | 8176 | { |
4393e105 MM |
8177 | tree rval; |
8178 | tree arg_binfo; | |
fcfb9f96 | 8179 | |
4393e105 MM |
8180 | my_friendly_assert (IS_AGGR_TYPE_CODE (TREE_CODE (arg)), 92); |
8181 | ||
8182 | arg_binfo = TYPE_BINFO (complete_type (arg)); | |
8183 | rval = get_template_base_recursive (tparms, targs, | |
8184 | parm, arg_binfo, | |
8185 | NULL_TREE, | |
8186 | GTB_IGNORE_TYPE); | |
fcfb9f96 | 8187 | |
4393e105 MM |
8188 | /* Since get_template_base_recursive marks the bases classes, we |
8189 | must unmark them here. */ | |
d6479fe7 | 8190 | dfs_walk (arg_binfo, dfs_unmark, markedp, 0); |
fcfb9f96 MM |
8191 | |
8192 | return rval; | |
8193 | } | |
8194 | ||
db2767b6 MM |
8195 | /* Returns the level of DECL, which declares a template parameter. */ |
8196 | ||
e9659ab0 | 8197 | static int |
db2767b6 MM |
8198 | template_decl_level (decl) |
8199 | tree decl; | |
8200 | { | |
8201 | switch (TREE_CODE (decl)) | |
8202 | { | |
8203 | case TYPE_DECL: | |
8204 | case TEMPLATE_DECL: | |
8205 | return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl)); | |
8206 | ||
8207 | case PARM_DECL: | |
8208 | return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl)); | |
8209 | ||
8210 | default: | |
8211 | my_friendly_abort (0); | |
5ffe581d | 8212 | return 0; |
db2767b6 MM |
8213 | } |
8214 | } | |
8215 | ||
830bfa74 MM |
8216 | /* Decide whether ARG can be unified with PARM, considering only the |
8217 | cv-qualifiers of each type, given STRICT as documented for unify. | |
8218 | Returns non-zero iff the unification is OK on that basis.*/ | |
e92cc029 | 8219 | |
e9659ab0 | 8220 | static int |
830bfa74 MM |
8221 | check_cv_quals_for_unify (strict, arg, parm) |
8222 | int strict; | |
8223 | tree arg; | |
8224 | tree parm; | |
8225 | { | |
ef637255 MM |
8226 | if (!(strict & UNIFY_ALLOW_MORE_CV_QUAL) |
8227 | && !at_least_as_qualified_p (arg, parm)) | |
8228 | return 0; | |
8229 | ||
8230 | if (!(strict & UNIFY_ALLOW_LESS_CV_QUAL) | |
8231 | && !at_least_as_qualified_p (parm, arg)) | |
8232 | return 0; | |
8233 | ||
ef637255 | 8234 | return 1; |
830bfa74 MM |
8235 | } |
8236 | ||
8237 | /* Takes parameters as for type_unification. Returns 0 if the | |
8238 | type deduction suceeds, 1 otherwise. The parameter STRICT is a | |
8239 | bitwise or of the following flags: | |
8240 | ||
8241 | UNIFY_ALLOW_NONE: | |
8242 | Require an exact match between PARM and ARG. | |
8243 | UNIFY_ALLOW_MORE_CV_QUAL: | |
8244 | Allow the deduced ARG to be more cv-qualified than ARG. | |
8245 | UNIFY_ALLOW_LESS_CV_QUAL: | |
8246 | Allow the deduced ARG to be less cv-qualified than ARG. | |
8247 | UNIFY_ALLOW_DERIVED: | |
8248 | Allow the deduced ARG to be a template base class of ARG, | |
8249 | or a pointer to a template base class of the type pointed to by | |
161c12b0 JM |
8250 | ARG. |
8251 | UNIFY_ALLOW_INTEGER: | |
8252 | Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX | |
8253 | case for more information. */ | |
830bfa74 | 8254 | |
e9659ab0 | 8255 | static int |
4393e105 | 8256 | unify (tparms, targs, parm, arg, strict) |
050367a3 | 8257 | tree tparms, targs, parm, arg; |
830bfa74 | 8258 | int strict; |
8d08fdba MS |
8259 | { |
8260 | int idx; | |
050367a3 | 8261 | tree targ; |
db2767b6 | 8262 | tree tparm; |
8d08fdba MS |
8263 | |
8264 | /* I don't think this will do the right thing with respect to types. | |
8265 | But the only case I've seen it in so far has been array bounds, where | |
8266 | signedness is the only information lost, and I think that will be | |
8267 | okay. */ | |
8268 | while (TREE_CODE (parm) == NOP_EXPR) | |
8269 | parm = TREE_OPERAND (parm, 0); | |
8270 | ||
8271 | if (arg == error_mark_node) | |
8272 | return 1; | |
8273 | if (arg == unknown_type_node) | |
34016c81 JM |
8274 | /* We can't deduce anything from this, but we might get all the |
8275 | template args from other function args. */ | |
8276 | return 0; | |
8277 | ||
db2767b6 | 8278 | /* If PARM uses template parameters, then we can't bail out here, |
6bdb985f | 8279 | even if ARG == PARM, since we won't record unifications for the |
db2767b6 MM |
8280 | template parameters. We might need them if we're trying to |
8281 | figure out which of two things is more specialized. */ | |
8282 | if (arg == parm && !uses_template_parms (parm)) | |
8d08fdba MS |
8283 | return 0; |
8284 | ||
830bfa74 MM |
8285 | /* Immediately reject some pairs that won't unify because of |
8286 | cv-qualification mismatches. */ | |
8287 | if (TREE_CODE (arg) == TREE_CODE (parm) | |
2f939d94 | 8288 | && TYPE_P (arg) |
830bfa74 MM |
8289 | /* We check the cv-qualifiers when unifying with template type |
8290 | parameters below. We want to allow ARG `const T' to unify with | |
8291 | PARM `T' for example, when computing which of two templates | |
8292 | is more specialized, for example. */ | |
8293 | && TREE_CODE (arg) != TEMPLATE_TYPE_PARM | |
8294 | && !check_cv_quals_for_unify (strict, arg, parm)) | |
49432171 JM |
8295 | return 1; |
8296 | ||
8d08fdba MS |
8297 | switch (TREE_CODE (parm)) |
8298 | { | |
2ca340ae JM |
8299 | case TYPENAME_TYPE: |
8300 | /* In a type which contains a nested-name-specifier, template | |
8301 | argument values cannot be deduced for template parameters used | |
8302 | within the nested-name-specifier. */ | |
8303 | return 0; | |
8304 | ||
8d08fdba | 8305 | case TEMPLATE_TYPE_PARM: |
73b0fce8 | 8306 | case TEMPLATE_TEMPLATE_PARM: |
db2767b6 MM |
8307 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
8308 | ||
8309 | if (TEMPLATE_TYPE_LEVEL (parm) | |
8310 | != template_decl_level (tparm)) | |
8311 | /* The PARM is not one we're trying to unify. Just check | |
8312 | to see if it matches ARG. */ | |
8313 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
3bfdc719 | 8314 | && same_type_p (parm, arg)) ? 0 : 1; |
73b0fce8 | 8315 | idx = TEMPLATE_TYPE_IDX (parm); |
050367a3 | 8316 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 8317 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx)); |
050367a3 | 8318 | |
73b0fce8 | 8319 | /* Check for mixed types and values. */ |
db2767b6 MM |
8320 | if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM |
8321 | && TREE_CODE (tparm) != TYPE_DECL) | |
8322 | || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
8323 | && TREE_CODE (tparm) != TEMPLATE_DECL)) | |
73b0fce8 KL |
8324 | return 1; |
8325 | ||
db2767b6 | 8326 | if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM) |
73b0fce8 | 8327 | { |
7ddedda4 | 8328 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm)) |
db2767b6 MM |
8329 | { |
8330 | /* We arrive here when PARM does not involve template | |
8331 | specialization. */ | |
73b0fce8 | 8332 | |
db2767b6 MM |
8333 | /* ARG must be constructed from a template class. */ |
8334 | if (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg)) | |
8335 | return 1; | |
73b0fce8 | 8336 | |
db2767b6 | 8337 | { |
7ddedda4 MM |
8338 | tree parmtmpl = TYPE_TI_TEMPLATE (parm); |
8339 | tree parmvec = TYPE_TI_ARGS (parm); | |
db2767b6 MM |
8340 | tree argvec = CLASSTYPE_TI_ARGS (arg); |
8341 | tree argtmplvec | |
8342 | = DECL_INNERMOST_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (arg)); | |
8343 | int i; | |
8344 | ||
8345 | /* The parameter and argument roles have to be switched here | |
8346 | in order to handle default arguments properly. For example, | |
8347 | template<template <class> class TT> void f(TT<int>) | |
8348 | should be able to accept vector<int> which comes from | |
744fac59 | 8349 | template <class T, class Allocator = allocator> |
73b0fce8 KL |
8350 | class vector. */ |
8351 | ||
fcfcdfc8 | 8352 | if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 0, 1) |
db2767b6 MM |
8353 | == error_mark_node) |
8354 | return 1; | |
73b0fce8 | 8355 | |
6b9b6b15 JM |
8356 | /* Deduce arguments T, i from TT<T> or TT<i>. |
8357 | We check each element of PARMVEC and ARGVEC individually | |
8358 | rather than the whole TREE_VEC since they can have | |
8359 | different number of elements. */ | |
8360 | ||
db2767b6 MM |
8361 | for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i) |
8362 | { | |
8363 | tree t = TREE_VEC_ELT (parmvec, i); | |
73b0fce8 | 8364 | |
830bfa74 MM |
8365 | if (unify (tparms, targs, t, |
8366 | TREE_VEC_ELT (argvec, i), | |
4393e105 | 8367 | UNIFY_ALLOW_NONE)) |
db2767b6 MM |
8368 | return 1; |
8369 | } | |
73b0fce8 | 8370 | } |
db2767b6 MM |
8371 | arg = CLASSTYPE_TI_TEMPLATE (arg); |
8372 | } | |
8373 | } | |
8374 | else | |
8375 | { | |
830bfa74 MM |
8376 | /* If PARM is `const T' and ARG is only `int', we don't have |
8377 | a match unless we are allowing additional qualification. | |
8378 | If ARG is `const int' and PARM is just `T' that's OK; | |
8379 | that binds `const int' to `T'. */ | |
8380 | if (!check_cv_quals_for_unify (strict | UNIFY_ALLOW_LESS_CV_QUAL, | |
8381 | arg, parm)) | |
db2767b6 MM |
8382 | return 1; |
8383 | ||
830bfa74 MM |
8384 | /* Consider the case where ARG is `const volatile int' and |
8385 | PARM is `const T'. Then, T should be `volatile int'. */ | |
8386 | arg = | |
adecb3f4 MM |
8387 | cp_build_qualified_type_real (arg, |
8388 | CP_TYPE_QUALS (arg) | |
8389 | & ~CP_TYPE_QUALS (parm), | |
8390 | /*complain=*/0); | |
8391 | if (arg == error_mark_node) | |
8392 | return 1; | |
73b0fce8 KL |
8393 | } |
8394 | ||
8395 | /* Simple cases: Value already set, does match or doesn't. */ | |
4393e105 | 8396 | if (targ != NULL_TREE && same_type_p (targ, arg)) |
73b0fce8 | 8397 | return 0; |
050367a3 | 8398 | else if (targ) |
73b0fce8 | 8399 | return 1; |
61cd552e MM |
8400 | |
8401 | /* Make sure that ARG is not a variable-sized array. (Note that | |
8402 | were talking about variable-sized arrays (like `int[n]'), | |
8403 | rather than arrays of unknown size (like `int[]').) We'll | |
8404 | get very confused by such a type since the bound of the array | |
8405 | will not be computable in an instantiation. Besides, such | |
8406 | types are not allowed in ISO C++, so we can do as we please | |
8407 | here. */ | |
8408 | if (TREE_CODE (arg) == ARRAY_TYPE | |
8409 | && !uses_template_parms (arg) | |
8410 | && (TREE_CODE (TYPE_MAX_VALUE (TYPE_DOMAIN (arg))) | |
8411 | != INTEGER_CST)) | |
8412 | return 1; | |
8413 | ||
050367a3 | 8414 | TREE_VEC_ELT (targs, idx) = arg; |
73b0fce8 KL |
8415 | return 0; |
8416 | ||
f84b4be9 | 8417 | case TEMPLATE_PARM_INDEX: |
db2767b6 MM |
8418 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
8419 | ||
8420 | if (TEMPLATE_PARM_LEVEL (parm) | |
8421 | != template_decl_level (tparm)) | |
8422 | /* The PARM is not one we're trying to unify. Just check | |
8423 | to see if it matches ARG. */ | |
8424 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
67ffc812 | 8425 | && cp_tree_equal (parm, arg) > 0) ? 0 : 1; |
db2767b6 | 8426 | |
f84b4be9 | 8427 | idx = TEMPLATE_PARM_IDX (parm); |
050367a3 | 8428 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 8429 | |
050367a3 | 8430 | if (targ) |
8d08fdba | 8431 | { |
67ffc812 | 8432 | int i = (cp_tree_equal (targ, arg) > 0); |
312e7d50 JM |
8433 | if (i == 1) |
8434 | return 0; | |
8435 | else if (i == 0) | |
8436 | return 1; | |
8437 | else | |
8438 | my_friendly_abort (42); | |
8d08fdba | 8439 | } |
8d08fdba | 8440 | |
161c12b0 JM |
8441 | /* [temp.deduct.type] If, in the declaration of a function template |
8442 | with a non-type template-parameter, the non-type | |
8443 | template-parameter is used in an expression in the function | |
8444 | parameter-list and, if the corresponding template-argument is | |
8445 | deduced, the template-argument type shall match the type of the | |
8446 | template-parameter exactly, except that a template-argument | |
8447 | deduced from an array bound may be of any integral type. */ | |
8448 | if (same_type_p (TREE_TYPE (arg), TREE_TYPE (parm))) | |
8449 | /* OK */; | |
8450 | else if ((strict & UNIFY_ALLOW_INTEGER) | |
8451 | && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE | |
8452 | || TREE_CODE (TREE_TYPE (parm)) == BOOLEAN_TYPE)) | |
8453 | /* OK */; | |
8454 | else | |
8455 | return 1; | |
8456 | ||
2a1e9fdd | 8457 | TREE_VEC_ELT (targs, idx) = arg; |
8d08fdba MS |
8458 | return 0; |
8459 | ||
8460 | case POINTER_TYPE: | |
830bfa74 MM |
8461 | { |
8462 | int sub_strict; | |
4ac14744 | 8463 | |
830bfa74 MM |
8464 | if (TREE_CODE (arg) != POINTER_TYPE) |
8465 | return 1; | |
8466 | ||
8467 | /* [temp.deduct.call] | |
8468 | ||
8469 | A can be another pointer or pointer to member type that can | |
8470 | be converted to the deduced A via a qualification | |
8471 | conversion (_conv.qual_). | |
8472 | ||
8473 | We pass down STRICT here rather than UNIFY_ALLOW_NONE. | |
8474 | This will allow for additional cv-qualification of the | |
8475 | pointed-to types if appropriate. In general, this is a bit | |
8476 | too generous; we are only supposed to allow qualification | |
8477 | conversions and this method will allow an ARG of char** and | |
8478 | a deduced ARG of const char**. However, overload | |
8479 | resolution will subsequently invalidate the candidate, so | |
8480 | this is probably OK. */ | |
8481 | sub_strict = strict; | |
8482 | ||
a7a64a77 | 8483 | if (TREE_CODE (TREE_TYPE (arg)) != RECORD_TYPE) |
830bfa74 MM |
8484 | /* The derived-to-base conversion only persists through one |
8485 | level of pointers. */ | |
8486 | sub_strict &= ~UNIFY_ALLOW_DERIVED; | |
8487 | ||
a7a64a77 MM |
8488 | return unify (tparms, targs, TREE_TYPE (parm), |
8489 | TREE_TYPE (arg), sub_strict); | |
830bfa74 | 8490 | } |
8d08fdba MS |
8491 | |
8492 | case REFERENCE_TYPE: | |
830bfa74 MM |
8493 | if (TREE_CODE (arg) != REFERENCE_TYPE) |
8494 | return 1; | |
8495 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), | |
4393e105 | 8496 | UNIFY_ALLOW_NONE); |
8d08fdba MS |
8497 | |
8498 | case ARRAY_TYPE: | |
8499 | if (TREE_CODE (arg) != ARRAY_TYPE) | |
8500 | return 1; | |
3042d5be MM |
8501 | if ((TYPE_DOMAIN (parm) == NULL_TREE) |
8502 | != (TYPE_DOMAIN (arg) == NULL_TREE)) | |
8503 | return 1; | |
8504 | if (TYPE_DOMAIN (parm) != NULL_TREE | |
830bfa74 | 8505 | && unify (tparms, targs, TYPE_DOMAIN (parm), |
4393e105 | 8506 | TYPE_DOMAIN (arg), UNIFY_ALLOW_NONE) != 0) |
8d08fdba | 8507 | return 1; |
830bfa74 | 8508 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
4393e105 | 8509 | UNIFY_ALLOW_NONE); |
8d08fdba MS |
8510 | |
8511 | case REAL_TYPE: | |
37c46b43 | 8512 | case COMPLEX_TYPE: |
8d08fdba | 8513 | case INTEGER_TYPE: |
42976354 | 8514 | case BOOLEAN_TYPE: |
5ad5a526 | 8515 | case VOID_TYPE: |
f376e137 MS |
8516 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8517 | return 1; | |
8518 | ||
514a1f18 JM |
8519 | if (TREE_CODE (parm) == INTEGER_TYPE |
8520 | && TREE_CODE (TYPE_MAX_VALUE (parm)) != INTEGER_CST) | |
8d08fdba MS |
8521 | { |
8522 | if (TYPE_MIN_VALUE (parm) && TYPE_MIN_VALUE (arg) | |
830bfa74 | 8523 | && unify (tparms, targs, TYPE_MIN_VALUE (parm), |
4393e105 | 8524 | TYPE_MIN_VALUE (arg), UNIFY_ALLOW_INTEGER)) |
8d08fdba MS |
8525 | return 1; |
8526 | if (TYPE_MAX_VALUE (parm) && TYPE_MAX_VALUE (arg) | |
830bfa74 | 8527 | && unify (tparms, targs, TYPE_MAX_VALUE (parm), |
4393e105 | 8528 | TYPE_MAX_VALUE (arg), UNIFY_ALLOW_INTEGER)) |
8d08fdba MS |
8529 | return 1; |
8530 | } | |
514a1f18 JM |
8531 | /* We use the TYPE_MAIN_VARIANT since we have already |
8532 | checked cv-qualification at the top of the | |
8533 | function. */ | |
3bfdc719 MM |
8534 | else if (!same_type_p (TYPE_MAIN_VARIANT (arg), |
8535 | TYPE_MAIN_VARIANT (parm))) | |
ca79f85d JM |
8536 | return 1; |
8537 | ||
8d08fdba MS |
8538 | /* As far as unification is concerned, this wins. Later checks |
8539 | will invalidate it if necessary. */ | |
8540 | return 0; | |
8541 | ||
8542 | /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */ | |
bd6dd845 | 8543 | /* Type INTEGER_CST can come from ordinary constant template args. */ |
8d08fdba | 8544 | case INTEGER_CST: |
bd6dd845 MS |
8545 | while (TREE_CODE (arg) == NOP_EXPR) |
8546 | arg = TREE_OPERAND (arg, 0); | |
8547 | ||
8d08fdba MS |
8548 | if (TREE_CODE (arg) != INTEGER_CST) |
8549 | return 1; | |
8550 | return !tree_int_cst_equal (parm, arg); | |
8551 | ||
8d08fdba MS |
8552 | case TREE_VEC: |
8553 | { | |
8554 | int i; | |
8555 | if (TREE_CODE (arg) != TREE_VEC) | |
8556 | return 1; | |
8557 | if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg)) | |
8558 | return 1; | |
8559 | for (i = TREE_VEC_LENGTH (parm) - 1; i >= 0; i--) | |
830bfa74 | 8560 | if (unify (tparms, targs, |
8d08fdba | 8561 | TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i), |
4393e105 | 8562 | UNIFY_ALLOW_NONE)) |
8d08fdba MS |
8563 | return 1; |
8564 | return 0; | |
8565 | } | |
8566 | ||
8d08fdba | 8567 | case RECORD_TYPE: |
f181d4ae | 8568 | case UNION_TYPE: |
f181d4ae | 8569 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
a4443a08 | 8570 | return 1; |
830bfa74 | 8571 | |
a7a64a77 MM |
8572 | if (TYPE_PTRMEMFUNC_P (parm)) |
8573 | { | |
8574 | if (!TYPE_PTRMEMFUNC_P (arg)) | |
8575 | return 1; | |
8576 | ||
8577 | return unify (tparms, targs, | |
8578 | TYPE_PTRMEMFUNC_FN_TYPE (parm), | |
8579 | TYPE_PTRMEMFUNC_FN_TYPE (arg), | |
8580 | strict); | |
8581 | } | |
8582 | ||
5db698f6 | 8583 | if (CLASSTYPE_TEMPLATE_INFO (parm)) |
5566b478 | 8584 | { |
6467930b | 8585 | tree t = NULL_TREE; |
4393e105 | 8586 | |
830bfa74 | 8587 | if (strict & UNIFY_ALLOW_DERIVED) |
4393e105 MM |
8588 | { |
8589 | /* First, we try to unify the PARM and ARG directly. */ | |
8590 | t = try_class_unification (tparms, targs, | |
8591 | parm, arg); | |
8592 | ||
8593 | if (!t) | |
8594 | { | |
8595 | /* Fallback to the special case allowed in | |
8596 | [temp.deduct.call]: | |
8597 | ||
8598 | If P is a class, and P has the form | |
8599 | template-id, then A can be a derived class of | |
8600 | the deduced A. Likewise, if P is a pointer to | |
8601 | a class of the form template-id, A can be a | |
8602 | pointer to a derived class pointed to by the | |
8603 | deduced A. */ | |
8604 | t = get_template_base (tparms, targs, | |
8605 | parm, arg); | |
8606 | ||
8607 | if (! t || t == error_mark_node) | |
8608 | return 1; | |
8609 | } | |
8610 | } | |
6df47b06 | 8611 | else if (CLASSTYPE_TEMPLATE_INFO (arg) |
9fbf56f7 MM |
8612 | && (CLASSTYPE_TI_TEMPLATE (parm) |
8613 | == CLASSTYPE_TI_TEMPLATE (arg))) | |
6df47b06 MM |
8614 | /* Perhaps PARM is something like S<U> and ARG is S<int>. |
8615 | Then, we should unify `int' and `U'. */ | |
6467930b | 8616 | t = arg; |
4393e105 MM |
8617 | else |
8618 | /* There's no chance of unication succeeding. */ | |
5566b478 | 8619 | return 1; |
6467930b | 8620 | |
830bfa74 | 8621 | return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm), |
4393e105 | 8622 | CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE); |
5566b478 | 8623 | } |
3bfdc719 MM |
8624 | else if (!same_type_p (TYPE_MAIN_VARIANT (parm), |
8625 | TYPE_MAIN_VARIANT (arg))) | |
5566b478 | 8626 | return 1; |
a4443a08 | 8627 | return 0; |
8d08fdba MS |
8628 | |
8629 | case METHOD_TYPE: | |
8d08fdba | 8630 | case FUNCTION_TYPE: |
830bfa74 | 8631 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8d08fdba | 8632 | return 1; |
830bfa74 MM |
8633 | |
8634 | if (unify (tparms, targs, TREE_TYPE (parm), | |
4393e105 | 8635 | TREE_TYPE (arg), UNIFY_ALLOW_NONE)) |
28cbf42c | 8636 | return 1; |
386b8a85 | 8637 | return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm), |
3b3ba9f0 | 8638 | TYPE_ARG_TYPES (arg), 1, |
4393e105 | 8639 | DEDUCE_EXACT, 0); |
a4443a08 MS |
8640 | |
8641 | case OFFSET_TYPE: | |
8642 | if (TREE_CODE (arg) != OFFSET_TYPE) | |
8643 | return 1; | |
830bfa74 | 8644 | if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm), |
4393e105 | 8645 | TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE)) |
a4443a08 | 8646 | return 1; |
830bfa74 | 8647 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
4393e105 | 8648 | strict); |
a4443a08 | 8649 | |
f62dbf03 | 8650 | case CONST_DECL: |
830bfa74 | 8651 | if (arg != decl_constant_value (parm)) |
f62dbf03 JM |
8652 | return 1; |
8653 | return 0; | |
8654 | ||
027905b4 KL |
8655 | case TEMPLATE_DECL: |
8656 | /* Matched cases are handled by the ARG == PARM test above. */ | |
8657 | return 1; | |
8658 | ||
53929c47 JM |
8659 | case MINUS_EXPR: |
8660 | if (TREE_CODE (TREE_OPERAND (parm, 1)) == INTEGER_CST) | |
8661 | { | |
8662 | /* We handle this case specially, since it comes up with | |
8663 | arrays. In particular, something like: | |
8664 | ||
8665 | template <int N> void f(int (&x)[N]); | |
8666 | ||
8667 | Here, we are trying to unify the range type, which | |
8668 | looks like [0 ... (N - 1)]. */ | |
8669 | tree t, t1, t2; | |
8670 | t1 = TREE_OPERAND (parm, 0); | |
8671 | t2 = TREE_OPERAND (parm, 1); | |
8672 | ||
24e2e58e | 8673 | t = fold (build (PLUS_EXPR, integer_type_node, arg, t2)); |
53929c47 | 8674 | |
4393e105 | 8675 | return unify (tparms, targs, t1, t, strict); |
53929c47 JM |
8676 | } |
8677 | /* else fall through */ | |
8678 | ||
8d08fdba | 8679 | default: |
050367a3 | 8680 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (parm)))) |
4393e105 MM |
8681 | /* We're looking at an expression. This can happen with |
8682 | something like: | |
8683 | ||
8684 | template <int I> | |
8685 | void foo(S<I>, S<I + 2>); | |
050367a3 | 8686 | |
4393e105 | 8687 | This is a "nondeduced context": |
050367a3 | 8688 | |
4393e105 MM |
8689 | [deduct.type] |
8690 | ||
8691 | The nondeduced contexts are: | |
050367a3 | 8692 | |
4393e105 MM |
8693 | --A type that is a template-id in which one or more of |
8694 | the template-arguments is an expression that references | |
8695 | a template-parameter. | |
050367a3 | 8696 | |
4393e105 MM |
8697 | In these cases, we assume deduction succeeded, but don't |
8698 | actually infer any unifications. */ | |
8699 | return 0; | |
050367a3 | 8700 | else |
b4c4a9ec MM |
8701 | sorry ("use of `%s' in template type unification", |
8702 | tree_code_name [(int) TREE_CODE (parm)]); | |
050367a3 | 8703 | |
8d08fdba MS |
8704 | return 1; |
8705 | } | |
8706 | } | |
8d08fdba | 8707 | \f |
03d0f4af MM |
8708 | /* Called if RESULT is explicitly instantiated, or is a member of an |
8709 | explicitly instantiated class, or if using -frepo and the | |
8710 | instantiation of RESULT has been assigned to this file. */ | |
8711 | ||
faae18ab | 8712 | void |
5566b478 | 8713 | mark_decl_instantiated (result, extern_p) |
faae18ab MS |
8714 | tree result; |
8715 | int extern_p; | |
8716 | { | |
75650646 MM |
8717 | if (TREE_CODE (result) != FUNCTION_DECL) |
8718 | /* The TREE_PUBLIC flag for function declarations will have been | |
8719 | set correctly by tsubst. */ | |
8720 | TREE_PUBLIC (result) = 1; | |
faae18ab MS |
8721 | |
8722 | if (! extern_p) | |
8723 | { | |
8724 | DECL_INTERFACE_KNOWN (result) = 1; | |
8725 | DECL_NOT_REALLY_EXTERN (result) = 1; | |
a7d87521 | 8726 | |
1a408d07 JM |
8727 | /* Always make artificials weak. */ |
8728 | if (DECL_ARTIFICIAL (result) && flag_weak) | |
8729 | comdat_linkage (result); | |
a7d87521 JM |
8730 | /* For WIN32 we also want to put explicit instantiations in |
8731 | linkonce sections. */ | |
1a408d07 | 8732 | else if (TREE_PUBLIC (result)) |
b385c841 | 8733 | maybe_make_one_only (result); |
faae18ab | 8734 | } |
f49422da | 8735 | else if (TREE_CODE (result) == FUNCTION_DECL) |
56e770bf | 8736 | defer_fn (result); |
faae18ab MS |
8737 | } |
8738 | ||
e1467ff2 MM |
8739 | /* Given two function templates PAT1 and PAT2, and explicit template |
8740 | arguments EXPLICIT_ARGS return: | |
6467930b MS |
8741 | |
8742 | 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order]. | |
8743 | -1 if PAT2 is more specialized than PAT1. | |
8744 | 0 if neither is more specialized. */ | |
8745 | ||
8746 | int | |
e1467ff2 MM |
8747 | more_specialized (pat1, pat2, explicit_args) |
8748 | tree pat1, pat2, explicit_args; | |
6467930b | 8749 | { |
98c1c668 | 8750 | tree targs; |
73aad9b9 | 8751 | int winner = 0; |
6467930b | 8752 | |
17aec3eb RK |
8753 | targs |
8754 | = get_bindings_overload (pat1, DECL_TEMPLATE_RESULT (pat2), explicit_args); | |
73aad9b9 | 8755 | if (targs) |
36a117a5 | 8756 | --winner; |
6467930b | 8757 | |
17aec3eb RK |
8758 | targs |
8759 | = get_bindings_overload (pat2, DECL_TEMPLATE_RESULT (pat1), explicit_args); | |
73aad9b9 | 8760 | if (targs) |
36a117a5 | 8761 | ++winner; |
6467930b | 8762 | |
73aad9b9 JM |
8763 | return winner; |
8764 | } | |
6467930b | 8765 | |
73aad9b9 | 8766 | /* Given two class template specialization list nodes PAT1 and PAT2, return: |
6467930b | 8767 | |
73aad9b9 JM |
8768 | 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order]. |
8769 | -1 if PAT2 is more specialized than PAT1. | |
8770 | 0 if neither is more specialized. */ | |
8771 | ||
8772 | int | |
8773 | more_specialized_class (pat1, pat2) | |
8774 | tree pat1, pat2; | |
8775 | { | |
8776 | tree targs; | |
8777 | int winner = 0; | |
8778 | ||
36a117a5 MM |
8779 | targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1), |
8780 | TREE_PURPOSE (pat2)); | |
73aad9b9 JM |
8781 | if (targs) |
8782 | --winner; | |
8783 | ||
36a117a5 MM |
8784 | targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2), |
8785 | TREE_PURPOSE (pat1)); | |
73aad9b9 | 8786 | if (targs) |
6467930b MS |
8787 | ++winner; |
8788 | ||
8789 | return winner; | |
8790 | } | |
73aad9b9 JM |
8791 | |
8792 | /* Return the template arguments that will produce the function signature | |
e1467ff2 | 8793 | DECL from the function template FN, with the explicit template |
76b9a14d | 8794 | arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must |
4393e105 MM |
8795 | also match. Return NULL_TREE if no satisfactory arguments could be |
8796 | found. */ | |
73aad9b9 | 8797 | |
76b9a14d JM |
8798 | static tree |
8799 | get_bindings_real (fn, decl, explicit_args, check_rettype) | |
e1467ff2 | 8800 | tree fn, decl, explicit_args; |
76b9a14d | 8801 | int check_rettype; |
73aad9b9 | 8802 | { |
98c1c668 | 8803 | int ntparms = DECL_NTPARMS (fn); |
f31c0a32 | 8804 | tree targs = make_tree_vec (ntparms); |
4393e105 | 8805 | tree decl_type; |
03017874 | 8806 | tree decl_arg_types; |
98c1c668 JM |
8807 | int i; |
8808 | ||
4393e105 MM |
8809 | /* Substitute the explicit template arguments into the type of DECL. |
8810 | The call to fn_type_unification will handle substitution into the | |
8811 | FN. */ | |
8812 | decl_type = TREE_TYPE (decl); | |
8813 | if (explicit_args && uses_template_parms (decl_type)) | |
8814 | { | |
8815 | tree tmpl; | |
8816 | tree converted_args; | |
8817 | ||
8818 | if (DECL_TEMPLATE_INFO (decl)) | |
8819 | tmpl = DECL_TI_TEMPLATE (decl); | |
8820 | else | |
8821 | /* We can get here for some illegal specializations. */ | |
8822 | return NULL_TREE; | |
8823 | ||
8824 | converted_args | |
8825 | = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
8826 | explicit_args, NULL_TREE, | |
8827 | /*complain=*/0, | |
8828 | /*require_all_arguments=*/0)); | |
8829 | if (converted_args == error_mark_node) | |
8830 | return NULL_TREE; | |
8831 | ||
8832 | decl_type = tsubst (decl_type, converted_args, /*complain=*/0, | |
8833 | NULL_TREE); | |
8834 | if (decl_type == error_mark_node) | |
8835 | return NULL_TREE; | |
8836 | } | |
8837 | ||
03017874 MM |
8838 | /* If FN is a static member function, adjust the type of DECL |
8839 | appropriately. */ | |
4393e105 | 8840 | decl_arg_types = TYPE_ARG_TYPES (decl_type); |
d7684f2d MM |
8841 | if (DECL_STATIC_FUNCTION_P (fn) |
8842 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
03017874 | 8843 | decl_arg_types = TREE_CHAIN (decl_arg_types); |
d7684f2d | 8844 | |
e1467ff2 | 8845 | i = fn_type_unification (fn, explicit_args, targs, |
03017874 | 8846 | decl_arg_types, |
8d3631f8 NS |
8847 | (check_rettype || DECL_CONV_FN_P (fn) |
8848 | ? TREE_TYPE (decl_type) : NULL_TREE), | |
03017874 | 8849 | DEDUCE_EXACT); |
98c1c668 | 8850 | |
76b9a14d JM |
8851 | if (i != 0) |
8852 | return NULL_TREE; | |
8853 | ||
76b9a14d JM |
8854 | return targs; |
8855 | } | |
8856 | ||
8857 | /* For most uses, we want to check the return type. */ | |
8858 | ||
8859 | tree | |
8860 | get_bindings (fn, decl, explicit_args) | |
8861 | tree fn, decl, explicit_args; | |
8862 | { | |
8863 | return get_bindings_real (fn, decl, explicit_args, 1); | |
8864 | } | |
8865 | ||
8866 | /* But for more_specialized, we only care about the parameter types. */ | |
8867 | ||
8868 | static tree | |
8869 | get_bindings_overload (fn, decl, explicit_args) | |
8870 | tree fn, decl, explicit_args; | |
8871 | { | |
8872 | return get_bindings_real (fn, decl, explicit_args, 0); | |
73aad9b9 JM |
8873 | } |
8874 | ||
36a117a5 MM |
8875 | /* Return the innermost template arguments that, when applied to a |
8876 | template specialization whose innermost template parameters are | |
8877 | TPARMS, and whose specialization arguments are ARGS, yield the | |
8878 | ARGS. | |
8879 | ||
8880 | For example, suppose we have: | |
8881 | ||
8882 | template <class T, class U> struct S {}; | |
8883 | template <class T> struct S<T*, int> {}; | |
8884 | ||
8885 | Then, suppose we want to get `S<double*, int>'. The TPARMS will be | |
8886 | {T}, the PARMS will be {T*, int} and the ARGS will be {double*, | |
8887 | int}. The resulting vector will be {double}, indicating that `T' | |
8888 | is bound to `double'. */ | |
8889 | ||
bd6dd845 | 8890 | static tree |
36a117a5 MM |
8891 | get_class_bindings (tparms, parms, args) |
8892 | tree tparms, parms, args; | |
73aad9b9 | 8893 | { |
3b3ba9f0 | 8894 | int i, ntparms = TREE_VEC_LENGTH (tparms); |
f31c0a32 | 8895 | tree vec = make_tree_vec (ntparms); |
73aad9b9 | 8896 | |
36a117a5 | 8897 | args = innermost_args (args); |
8d019cef | 8898 | |
4393e105 | 8899 | if (unify (tparms, vec, parms, args, UNIFY_ALLOW_NONE)) |
fcfb9f96 | 8900 | return NULL_TREE; |
73aad9b9 JM |
8901 | |
8902 | for (i = 0; i < ntparms; ++i) | |
8903 | if (! TREE_VEC_ELT (vec, i)) | |
8904 | return NULL_TREE; | |
8905 | ||
8906 | return vec; | |
8907 | } | |
8908 | ||
104bf76a MM |
8909 | /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs. |
8910 | Pick the most specialized template, and return the corresponding | |
8911 | instantiation, or if there is no corresponding instantiation, the | |
8912 | template itself. EXPLICIT_ARGS is any template arguments explicity | |
8913 | mentioned in a template-id. If there is no most specialized | |
5186142b | 8914 | template, error_mark_node is returned. If there are no templates |
104bf76a | 8915 | at all, NULL_TREE is returned. */ |
73aad9b9 JM |
8916 | |
8917 | tree | |
104bf76a MM |
8918 | most_specialized_instantiation (instantiations, explicit_args) |
8919 | tree instantiations; | |
8920 | tree explicit_args; | |
73aad9b9 | 8921 | { |
104bf76a | 8922 | tree fn, champ; |
73aad9b9 JM |
8923 | int fate; |
8924 | ||
104bf76a | 8925 | if (!instantiations) |
73aad9b9 JM |
8926 | return NULL_TREE; |
8927 | ||
104bf76a MM |
8928 | champ = instantiations; |
8929 | for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn)) | |
73aad9b9 | 8930 | { |
104bf76a MM |
8931 | fate = more_specialized (TREE_VALUE (champ), |
8932 | TREE_VALUE (fn), explicit_args); | |
73aad9b9 JM |
8933 | if (fate == 1) |
8934 | ; | |
8935 | else | |
8936 | { | |
8937 | if (fate == 0) | |
8938 | { | |
8939 | fn = TREE_CHAIN (fn); | |
8940 | if (! fn) | |
8941 | return error_mark_node; | |
8942 | } | |
104bf76a | 8943 | champ = fn; |
73aad9b9 JM |
8944 | } |
8945 | } | |
8946 | ||
104bf76a | 8947 | for (fn = instantiations; fn && fn != champ; fn = TREE_CHAIN (fn)) |
73aad9b9 | 8948 | { |
104bf76a MM |
8949 | fate = more_specialized (TREE_VALUE (champ), |
8950 | TREE_VALUE (fn), explicit_args); | |
73aad9b9 JM |
8951 | if (fate != 1) |
8952 | return error_mark_node; | |
8953 | } | |
8954 | ||
104bf76a MM |
8955 | return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ); |
8956 | } | |
8957 | ||
8958 | /* Return the most specialized of the list of templates in FNS that can | |
8959 | produce an instantiation matching DECL, given the explicit template | |
8960 | arguments EXPLICIT_ARGS. */ | |
8961 | ||
e9659ab0 | 8962 | static tree |
104bf76a MM |
8963 | most_specialized (fns, decl, explicit_args) |
8964 | tree fns, decl, explicit_args; | |
8965 | { | |
8966 | tree candidates = NULL_TREE; | |
8967 | tree fn, args; | |
8968 | ||
8969 | for (fn = fns; fn; fn = TREE_CHAIN (fn)) | |
8970 | { | |
8971 | tree candidate = TREE_VALUE (fn); | |
8972 | ||
8973 | args = get_bindings (candidate, decl, explicit_args); | |
8974 | if (args) | |
e1b3e07d | 8975 | candidates = tree_cons (NULL_TREE, candidate, candidates); |
104bf76a MM |
8976 | } |
8977 | ||
8978 | return most_specialized_instantiation (candidates, explicit_args); | |
73aad9b9 JM |
8979 | } |
8980 | ||
36a117a5 MM |
8981 | /* If DECL is a specialization of some template, return the most |
8982 | general such template. For example, given: | |
8983 | ||
8984 | template <class T> struct S { template <class U> void f(U); }; | |
8985 | ||
8986 | if TMPL is `template <class U> void S<int>::f(U)' this will return | |
8987 | the full template. This function will not trace past partial | |
8988 | specializations, however. For example, given in addition: | |
8989 | ||
8990 | template <class T> struct S<T*> { template <class U> void f(U); }; | |
8991 | ||
8992 | if TMPL is `template <class U> void S<int*>::f(U)' this will return | |
8993 | `template <class T> template <class U> S<T*>::f(U)'. */ | |
73aad9b9 | 8994 | |
612c671a | 8995 | tree |
36a117a5 MM |
8996 | most_general_template (decl) |
8997 | tree decl; | |
73aad9b9 | 8998 | { |
b5ac18ea | 8999 | while (DECL_TEMPLATE_INFO (decl) |
74b846e0 MM |
9000 | && !(TREE_CODE (decl) == TEMPLATE_DECL |
9001 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
b5ac18ea MM |
9002 | /* The DECL_TI_TEMPLATE can be a LOOKUP_EXPR or |
9003 | IDENTIFIER_NODE in some cases. (See cp-tree.h for | |
9004 | details.) */ | |
9005 | && TREE_CODE (DECL_TI_TEMPLATE (decl)) == TEMPLATE_DECL) | |
36a117a5 MM |
9006 | decl = DECL_TI_TEMPLATE (decl); |
9007 | ||
9008 | return decl; | |
9009 | } | |
9010 | ||
9011 | /* Return the most specialized of the class template specializations | |
9012 | of TMPL which can produce an instantiation matching ARGS, or | |
9013 | error_mark_node if the choice is ambiguous. */ | |
9014 | ||
e9659ab0 | 9015 | static tree |
36a117a5 MM |
9016 | most_specialized_class (tmpl, args) |
9017 | tree tmpl; | |
9018 | tree args; | |
9019 | { | |
9020 | tree list = NULL_TREE; | |
9021 | tree t; | |
9022 | tree champ; | |
73aad9b9 JM |
9023 | int fate; |
9024 | ||
36a117a5 MM |
9025 | tmpl = most_general_template (tmpl); |
9026 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t)) | |
73aad9b9 | 9027 | { |
36a117a5 MM |
9028 | tree spec_args |
9029 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args); | |
9030 | if (spec_args) | |
73aad9b9 JM |
9031 | { |
9032 | list = decl_tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list); | |
9033 | TREE_TYPE (list) = TREE_TYPE (t); | |
9034 | } | |
9035 | } | |
9036 | ||
9037 | if (! list) | |
9038 | return NULL_TREE; | |
9039 | ||
9040 | t = list; | |
9041 | champ = t; | |
9042 | t = TREE_CHAIN (t); | |
9043 | for (; t; t = TREE_CHAIN (t)) | |
9044 | { | |
9045 | fate = more_specialized_class (champ, t); | |
9046 | if (fate == 1) | |
9047 | ; | |
9048 | else | |
9049 | { | |
9050 | if (fate == 0) | |
9051 | { | |
9052 | t = TREE_CHAIN (t); | |
9053 | if (! t) | |
9054 | return error_mark_node; | |
9055 | } | |
9056 | champ = t; | |
9057 | } | |
9058 | } | |
9059 | ||
9060 | for (t = list; t && t != champ; t = TREE_CHAIN (t)) | |
9061 | { | |
85b71cf2 | 9062 | fate = more_specialized_class (champ, t); |
73aad9b9 JM |
9063 | if (fate != 1) |
9064 | return error_mark_node; | |
9065 | } | |
9066 | ||
9067 | return champ; | |
9068 | } | |
9069 | ||
8d08fdba | 9070 | /* called from the parser. */ |
e92cc029 | 9071 | |
8d08fdba | 9072 | void |
6633d636 | 9073 | do_decl_instantiation (declspecs, declarator, storage) |
f0e01782 | 9074 | tree declspecs, declarator, storage; |
8d08fdba | 9075 | { |
c11b6f21 | 9076 | tree decl = grokdeclarator (declarator, declspecs, NORMAL, 0, NULL_TREE); |
8d08fdba | 9077 | tree result = NULL_TREE; |
faae18ab | 9078 | int extern_p = 0; |
e8abc66f | 9079 | |
3fa56191 MM |
9080 | if (!decl) |
9081 | /* An error ocurred, for which grokdeclarator has already issued | |
9082 | an appropriate message. */ | |
9083 | return; | |
9084 | else if (! DECL_LANG_SPECIFIC (decl)) | |
ec255269 | 9085 | { |
8251199e | 9086 | cp_error ("explicit instantiation of non-template `%#D'", decl); |
ec255269 MS |
9087 | return; |
9088 | } | |
03d0f4af | 9089 | else if (TREE_CODE (decl) == VAR_DECL) |
6633d636 | 9090 | { |
03d0f4af MM |
9091 | /* There is an asymmetry here in the way VAR_DECLs and |
9092 | FUNCTION_DECLs are handled by grokdeclarator. In the case of | |
9093 | the latter, the DECL we get back will be marked as a | |
9094 | template instantiation, and the appropriate | |
9095 | DECL_TEMPLATE_INFO will be set up. This does not happen for | |
9096 | VAR_DECLs so we do the lookup here. Probably, grokdeclarator | |
9097 | should handle VAR_DECLs as it currently handles | |
9098 | FUNCTION_DECLs. */ | |
6633d636 MS |
9099 | result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, 0); |
9100 | if (result && TREE_CODE (result) != VAR_DECL) | |
03d0f4af | 9101 | { |
8251199e | 9102 | cp_error ("no matching template for `%D' found", result); |
03d0f4af MM |
9103 | return; |
9104 | } | |
6633d636 MS |
9105 | } |
9106 | else if (TREE_CODE (decl) != FUNCTION_DECL) | |
9107 | { | |
8251199e | 9108 | cp_error ("explicit instantiation of `%#D'", decl); |
6633d636 MS |
9109 | return; |
9110 | } | |
03d0f4af MM |
9111 | else |
9112 | result = decl; | |
672476cb | 9113 | |
03d0f4af MM |
9114 | /* Check for various error cases. Note that if the explicit |
9115 | instantiation is legal the RESULT will currently be marked as an | |
9116 | *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set | |
9117 | until we get here. */ | |
9118 | ||
9119 | if (DECL_TEMPLATE_SPECIALIZATION (result)) | |
672476cb | 9120 | { |
03d0f4af MM |
9121 | /* [temp.spec] |
9122 | ||
9123 | No program shall both explicitly instantiate and explicitly | |
9124 | specialize a template. */ | |
6f1b4c42 JM |
9125 | cp_pedwarn ("explicit instantiation of `%#D' after", result); |
9126 | cp_pedwarn_at ("explicit specialization here", result); | |
672476cb MM |
9127 | return; |
9128 | } | |
03d0f4af MM |
9129 | else if (DECL_EXPLICIT_INSTANTIATION (result)) |
9130 | { | |
9131 | /* [temp.spec] | |
98c1c668 | 9132 | |
03d0f4af MM |
9133 | No program shall explicitly instantiate any template more |
9134 | than once. | |
9135 | ||
2aaf816d JM |
9136 | We check DECL_INTERFACE_KNOWN so as not to complain when the first |
9137 | instantiation was `extern' and the second is not, and EXTERN_P for | |
9138 | the opposite case. If -frepo, chances are we already got marked | |
9139 | as an explicit instantion because of the repo file. */ | |
9140 | if (DECL_INTERFACE_KNOWN (result) && !extern_p && !flag_use_repository) | |
6f1b4c42 | 9141 | cp_pedwarn ("duplicate explicit instantiation of `%#D'", result); |
03d0f4af MM |
9142 | |
9143 | /* If we've already instantiated the template, just return now. */ | |
9144 | if (DECL_INTERFACE_KNOWN (result)) | |
9145 | return; | |
9146 | } | |
9147 | else if (!DECL_IMPLICIT_INSTANTIATION (result)) | |
faae18ab | 9148 | { |
8251199e | 9149 | cp_error ("no matching template for `%D' found", result); |
faae18ab MS |
9150 | return; |
9151 | } | |
03d0f4af | 9152 | else if (!DECL_TEMPLATE_INFO (result)) |
6633d636 | 9153 | { |
8251199e | 9154 | cp_pedwarn ("explicit instantiation of non-template `%#D'", result); |
6633d636 MS |
9155 | return; |
9156 | } | |
9157 | ||
a0a33927 MS |
9158 | if (flag_external_templates) |
9159 | return; | |
9160 | ||
f0e01782 | 9161 | if (storage == NULL_TREE) |
00595019 | 9162 | ; |
faae18ab | 9163 | else if (storage == ridpointers[(int) RID_EXTERN]) |
03d0f4af MM |
9164 | { |
9165 | if (pedantic) | |
cab1f180 | 9166 | cp_pedwarn ("ISO C++ forbids the use of `extern' on explicit instantiations"); |
03d0f4af MM |
9167 | extern_p = 1; |
9168 | } | |
f0e01782 | 9169 | else |
8251199e | 9170 | cp_error ("storage class `%D' applied to template instantiation", |
f0e01782 | 9171 | storage); |
5566b478 | 9172 | |
03d0f4af | 9173 | SET_DECL_EXPLICIT_INSTANTIATION (result); |
5566b478 | 9174 | mark_decl_instantiated (result, extern_p); |
44a8d0b3 | 9175 | repo_template_instantiated (result, extern_p); |
c91a56d2 | 9176 | if (! extern_p) |
16d53b64 | 9177 | instantiate_decl (result, /*defer_ok=*/1); |
7177d104 MS |
9178 | } |
9179 | ||
faae18ab MS |
9180 | void |
9181 | mark_class_instantiated (t, extern_p) | |
9182 | tree t; | |
9183 | int extern_p; | |
9184 | { | |
9185 | SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t); | |
eb773359 JM |
9186 | SET_CLASSTYPE_INTERFACE_KNOWN (t); |
9187 | CLASSTYPE_INTERFACE_ONLY (t) = extern_p; | |
faae18ab MS |
9188 | CLASSTYPE_VTABLE_NEEDS_WRITING (t) = ! extern_p; |
9189 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p; | |
9190 | if (! extern_p) | |
9191 | { | |
9192 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; | |
9193 | rest_of_type_compilation (t, 1); | |
9194 | } | |
9195 | } | |
e8abc66f | 9196 | |
7177d104 | 9197 | void |
ca79f85d JM |
9198 | do_type_instantiation (t, storage) |
9199 | tree t, storage; | |
7177d104 | 9200 | { |
e8abc66f MS |
9201 | int extern_p = 0; |
9202 | int nomem_p = 0; | |
5566b478 MS |
9203 | int static_p = 0; |
9204 | ||
ca79f85d JM |
9205 | if (TREE_CODE (t) == TYPE_DECL) |
9206 | t = TREE_TYPE (t); | |
9207 | ||
7ddedda4 | 9208 | if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t)) |
ca79f85d | 9209 | { |
8251199e | 9210 | cp_error ("explicit instantiation of non-template type `%T'", t); |
ca79f85d JM |
9211 | return; |
9212 | } | |
9213 | ||
5566b478 | 9214 | complete_type (t); |
7177d104 | 9215 | |
a292b002 MS |
9216 | /* With -fexternal-templates, explicit instantiations are treated the same |
9217 | as implicit ones. */ | |
a0a33927 MS |
9218 | if (flag_external_templates) |
9219 | return; | |
9220 | ||
d0f062fb | 9221 | if (!COMPLETE_TYPE_P (t)) |
f0e01782 | 9222 | { |
8251199e | 9223 | cp_error ("explicit instantiation of `%#T' before definition of template", |
f0e01782 MS |
9224 | t); |
9225 | return; | |
9226 | } | |
9227 | ||
03d0f4af | 9228 | if (storage != NULL_TREE) |
f0e01782 | 9229 | { |
03d0f4af | 9230 | if (pedantic) |
cab1f180 | 9231 | cp_pedwarn("ISO C++ forbids the use of `%s' on explicit instantiations", |
8251199e | 9232 | IDENTIFIER_POINTER (storage)); |
03d0f4af MM |
9233 | |
9234 | if (storage == ridpointers[(int) RID_INLINE]) | |
9235 | nomem_p = 1; | |
9236 | else if (storage == ridpointers[(int) RID_EXTERN]) | |
9237 | extern_p = 1; | |
9238 | else if (storage == ridpointers[(int) RID_STATIC]) | |
9239 | static_p = 1; | |
9240 | else | |
9241 | { | |
8251199e | 9242 | cp_error ("storage class `%D' applied to template instantiation", |
03d0f4af MM |
9243 | storage); |
9244 | extern_p = 0; | |
9245 | } | |
f0e01782 MS |
9246 | } |
9247 | ||
370af2d5 | 9248 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
03d0f4af MM |
9249 | { |
9250 | /* [temp.spec] | |
a292b002 | 9251 | |
03d0f4af MM |
9252 | No program shall both explicitly instantiate and explicitly |
9253 | specialize a template. */ | |
8251199e JM |
9254 | cp_error ("explicit instantiation of `%#T' after", t); |
9255 | cp_error_at ("explicit specialization here", t); | |
03d0f4af MM |
9256 | return; |
9257 | } | |
9258 | else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t)) | |
44a8d0b3 | 9259 | { |
03d0f4af MM |
9260 | /* [temp.spec] |
9261 | ||
9262 | No program shall explicitly instantiate any template more | |
9263 | than once. | |
9264 | ||
2aaf816d JM |
9265 | If CLASSTYPE_INTERFACE_ONLY, then the first explicit instantiation |
9266 | was `extern'. If EXTERN_P then the second is. If -frepo, chances | |
9267 | are we already got marked as an explicit instantion because of the | |
9268 | repo file. All these cases are OK. */ | |
9269 | if (!CLASSTYPE_INTERFACE_ONLY (t) && !extern_p && !flag_use_repository) | |
9270 | cp_pedwarn ("duplicate explicit instantiation of `%#T'", t); | |
03d0f4af MM |
9271 | |
9272 | /* If we've already instantiated the template, just return now. */ | |
9273 | if (!CLASSTYPE_INTERFACE_ONLY (t)) | |
9274 | return; | |
44a8d0b3 | 9275 | } |
e8abc66f | 9276 | |
03d0f4af MM |
9277 | mark_class_instantiated (t, extern_p); |
9278 | repo_template_instantiated (t, extern_p); | |
9279 | ||
e8abc66f MS |
9280 | if (nomem_p) |
9281 | return; | |
9282 | ||
7177d104 | 9283 | { |
db5ae43f | 9284 | tree tmp; |
5566b478 | 9285 | |
03d0f4af MM |
9286 | /* In contrast to implicit instantiation, where only the |
9287 | declarations, and not the definitions, of members are | |
9288 | instantiated, we have here: | |
9289 | ||
9290 | [temp.explicit] | |
9291 | ||
9292 | The explicit instantiation of a class template specialization | |
9293 | implies the instantiation of all of its members not | |
9294 | previously explicitly specialized in the translation unit | |
9295 | containing the explicit instantiation. | |
9296 | ||
9297 | Of course, we can't instantiate member template classes, since | |
9298 | we don't have any arguments for them. Note that the standard | |
9299 | is unclear on whether the instatiation of the members are | |
9300 | *explicit* instantiations or not. We choose to be generous, | |
9301 | and not set DECL_EXPLICIT_INSTANTIATION. Therefore, we allow | |
9302 | the explicit instantiation of a class where some of the members | |
9303 | have no definition in the current translation unit. */ | |
9304 | ||
5566b478 MS |
9305 | if (! static_p) |
9306 | for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
a7d87521 | 9307 | if (TREE_CODE (tmp) == FUNCTION_DECL |
1f109f0f | 9308 | && DECL_TEMPLATE_INSTANTIATION (tmp)) |
5566b478 MS |
9309 | { |
9310 | mark_decl_instantiated (tmp, extern_p); | |
9311 | repo_template_instantiated (tmp, extern_p); | |
9312 | if (! extern_p) | |
16d53b64 | 9313 | instantiate_decl (tmp, /*defer_ok=*/1); |
5566b478 MS |
9314 | } |
9315 | ||
9316 | for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
9317 | if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp)) | |
863adfc0 | 9318 | { |
5566b478 | 9319 | mark_decl_instantiated (tmp, extern_p); |
863adfc0 | 9320 | repo_template_instantiated (tmp, extern_p); |
5566b478 | 9321 | if (! extern_p) |
16d53b64 | 9322 | instantiate_decl (tmp, /*defer_ok=*/1); |
863adfc0 | 9323 | } |
7177d104 | 9324 | |
a292b002 | 9325 | for (tmp = CLASSTYPE_TAGS (t); tmp; tmp = TREE_CHAIN (tmp)) |
e4a84209 MM |
9326 | if (IS_AGGR_TYPE (TREE_VALUE (tmp)) |
9327 | && !uses_template_parms (CLASSTYPE_TI_ARGS (TREE_VALUE (tmp)))) | |
f376e137 | 9328 | do_type_instantiation (TYPE_MAIN_DECL (TREE_VALUE (tmp)), storage); |
a292b002 | 9329 | } |
8d08fdba | 9330 | } |
a28e3c7f | 9331 | |
36a117a5 MM |
9332 | /* Given a function DECL, which is a specialization of TMPL, modify |
9333 | DECL to be a re-instantiation of TMPL with the same template | |
9334 | arguments. TMPL should be the template into which tsubst'ing | |
9335 | should occur for DECL, not the most general template. | |
830bfa74 MM |
9336 | |
9337 | One reason for doing this is a scenario like this: | |
9338 | ||
9339 | template <class T> | |
9340 | void f(const T&, int i); | |
9341 | ||
9342 | void g() { f(3, 7); } | |
9343 | ||
9344 | template <class T> | |
9345 | void f(const T& t, const int i) { } | |
9346 | ||
9347 | Note that when the template is first instantiated, with | |
9348 | instantiate_template, the resulting DECL will have no name for the | |
9349 | first parameter, and the wrong type for the second. So, when we go | |
9350 | to instantiate the DECL, we regenerate it. */ | |
9351 | ||
e9659ab0 | 9352 | static void |
830bfa74 MM |
9353 | regenerate_decl_from_template (decl, tmpl) |
9354 | tree decl; | |
9355 | tree tmpl; | |
9356 | { | |
9357 | tree args; | |
830bfa74 MM |
9358 | tree code_pattern; |
9359 | tree new_decl; | |
36a117a5 MM |
9360 | tree gen_tmpl; |
9361 | int unregistered; | |
830bfa74 MM |
9362 | |
9363 | args = DECL_TI_ARGS (decl); | |
9364 | code_pattern = DECL_TEMPLATE_RESULT (tmpl); | |
9365 | ||
8251199e JM |
9366 | /* Unregister the specialization so that when we tsubst we will not |
9367 | just return DECL. We don't have to unregister DECL from TMPL | |
9368 | because if would only be registered there if it were a partial | |
9369 | instantiation of a specialization, which it isn't: it's a full | |
9370 | instantiation. */ | |
36a117a5 MM |
9371 | gen_tmpl = most_general_template (tmpl); |
9372 | unregistered = unregister_specialization (decl, gen_tmpl); | |
9373 | ||
9374 | /* If the DECL was not unregistered then something peculiar is | |
9375 | happening: we created a specialization but did not call | |
9376 | register_specialization for it. */ | |
9377 | my_friendly_assert (unregistered, 0); | |
9378 | ||
61a127b3 MM |
9379 | if (TREE_CODE (decl) == VAR_DECL) |
9380 | /* Make sure that we can see identifiers, and compute access | |
9381 | correctly, for the class members used in the declaration of | |
9382 | this static variable. */ | |
9383 | pushclass (DECL_CONTEXT (decl), 2); | |
9384 | ||
d8c4447d | 9385 | /* Do the substitution to get the new declaration. */ |
4393e105 | 9386 | new_decl = tsubst (code_pattern, args, /*complain=*/1, NULL_TREE); |
830bfa74 MM |
9387 | |
9388 | if (TREE_CODE (decl) == VAR_DECL) | |
9389 | { | |
9390 | /* Set up DECL_INITIAL, since tsubst doesn't. */ | |
830bfa74 | 9391 | DECL_INITIAL (new_decl) = |
d8c4447d | 9392 | tsubst_expr (DECL_INITIAL (code_pattern), args, |
4393e105 | 9393 | /*complain=*/1, DECL_TI_TEMPLATE (decl)); |
61a127b3 | 9394 | /* Pop the class context we pushed above. */ |
b74a0560 | 9395 | popclass (); |
830bfa74 | 9396 | } |
2b0a63a3 | 9397 | else if (TREE_CODE (decl) == FUNCTION_DECL) |
fbf1c34b MM |
9398 | { |
9399 | /* Convince duplicate_decls to use the DECL_ARGUMENTS from the | |
9400 | new decl. */ | |
9401 | DECL_INITIAL (new_decl) = error_mark_node; | |
9402 | /* And don't complain about a duplicate definition. */ | |
9403 | DECL_INITIAL (decl) = NULL_TREE; | |
9404 | } | |
36a117a5 MM |
9405 | |
9406 | /* The immediate parent of the new template is still whatever it was | |
9407 | before, even though tsubst sets DECL_TI_TEMPLATE up as the most | |
9408 | general template. We also reset the DECL_ASSEMBLER_NAME since | |
9409 | tsubst always calculates the name as if the function in question | |
9410 | were really a template instance, and sometimes, with friend | |
9411 | functions, this is not so. See tsubst_friend_function for | |
9412 | details. */ | |
9413 | DECL_TI_TEMPLATE (new_decl) = DECL_TI_TEMPLATE (decl); | |
9414 | DECL_ASSEMBLER_NAME (new_decl) = DECL_ASSEMBLER_NAME (decl); | |
9415 | DECL_RTL (new_decl) = DECL_RTL (decl); | |
9416 | ||
9417 | /* Call duplicate decls to merge the old and new declarations. */ | |
830bfa74 MM |
9418 | duplicate_decls (new_decl, decl); |
9419 | ||
36a117a5 MM |
9420 | /* Now, re-register the specialization. */ |
9421 | register_specialization (decl, gen_tmpl, args); | |
830bfa74 MM |
9422 | } |
9423 | ||
16d53b64 MM |
9424 | /* Produce the definition of D, a _DECL generated from a template. If |
9425 | DEFER_OK is non-zero, then we don't have to actually do the | |
9426 | instantiation now; we just have to do it sometime. */ | |
f84b4be9 | 9427 | |
a28e3c7f | 9428 | tree |
16d53b64 | 9429 | instantiate_decl (d, defer_ok) |
5566b478 | 9430 | tree d; |
16d53b64 | 9431 | int defer_ok; |
a28e3c7f | 9432 | { |
36a117a5 MM |
9433 | tree tmpl = DECL_TI_TEMPLATE (d); |
9434 | tree args = DECL_TI_ARGS (d); | |
830bfa74 | 9435 | tree td; |
36a117a5 MM |
9436 | tree code_pattern; |
9437 | tree spec; | |
9438 | tree gen_tmpl; | |
5566b478 | 9439 | int pattern_defined; |
c27be9b9 JM |
9440 | int line = lineno; |
9441 | char *file = input_filename; | |
5566b478 | 9442 | |
36a117a5 MM |
9443 | /* This function should only be used to instantiate templates for |
9444 | functions and static member variables. */ | |
9445 | my_friendly_assert (TREE_CODE (d) == FUNCTION_DECL | |
9446 | || TREE_CODE (d) == VAR_DECL, 0); | |
9447 | ||
db9b2174 MM |
9448 | /* Don't instantiate cloned functions. Instead, instantiate the |
9449 | functions they cloned. */ | |
9450 | if (TREE_CODE (d) == FUNCTION_DECL && DECL_CLONED_FUNCTION_P (d)) | |
9451 | d = DECL_CLONED_FUNCTION (d); | |
9452 | ||
fbf1c34b | 9453 | if (DECL_TEMPLATE_INSTANTIATED (d)) |
03d0f4af MM |
9454 | /* D has already been instantiated. It might seem reasonable to |
9455 | check whether or not D is an explict instantiation, and, if so, | |
9456 | stop here. But when an explicit instantiation is deferred | |
9457 | until the end of the compilation, DECL_EXPLICIT_INSTANTIATION | |
9458 | is set, even though we still need to do the instantiation. */ | |
36a117a5 MM |
9459 | return d; |
9460 | ||
9461 | /* If we already have a specialization of this declaration, then | |
9462 | there's no reason to instantiate it. Note that | |
9463 | retrieve_specialization gives us both instantiations and | |
9464 | specializations, so we must explicitly check | |
9465 | DECL_TEMPLATE_SPECIALIZATION. */ | |
9466 | gen_tmpl = most_general_template (tmpl); | |
9467 | spec = retrieve_specialization (gen_tmpl, args); | |
9468 | if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec)) | |
9469 | return spec; | |
9470 | ||
9471 | /* This needs to happen before any tsubsting. */ | |
9472 | if (! push_tinst_level (d)) | |
9473 | return d; | |
9474 | ||
4d85e00e MM |
9475 | /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern |
9476 | for the instantiation. This is not always the most general | |
9477 | template. Consider, for example: | |
9478 | ||
9479 | template <class T> | |
9480 | struct S { template <class U> void f(); | |
9481 | template <> void f<int>(); }; | |
9482 | ||
9483 | and an instantiation of S<double>::f<int>. We want TD to be the | |
9484 | specialization S<T>::f<int>, not the more general S<T>::f<U>. */ | |
9485 | td = tmpl; | |
9486 | for (td = tmpl; | |
9487 | /* An instantiation cannot have a definition, so we need a | |
9488 | more general template. */ | |
9489 | DECL_TEMPLATE_INSTANTIATION (td) | |
9490 | /* We must also deal with friend templates. Given: | |
9491 | ||
9492 | template <class T> struct S { | |
9493 | template <class U> friend void f() {}; | |
9494 | }; | |
9495 | ||
9496 | S<int>::f<U> say, is not an instantiation of S<T>::f<U>, | |
9497 | so far as the language is concerned, but that's still | |
9498 | where we get the pattern for the instantiation from. On | |
9499 | ther hand, if the definition comes outside the class, say: | |
9500 | ||
9501 | template <class T> struct S { | |
9502 | template <class U> friend void f(); | |
9503 | }; | |
9504 | template <class U> friend void f() {} | |
9505 | ||
9506 | we don't need to look any further. That's what the check for | |
9507 | DECL_INITIAL is for. */ | |
9508 | || (TREE_CODE (d) == FUNCTION_DECL | |
61289ca3 | 9509 | && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (td) |
4d85e00e | 9510 | && !DECL_INITIAL (DECL_TEMPLATE_RESULT (td))); |
f84b4be9 | 9511 | ) |
4d85e00e MM |
9512 | { |
9513 | /* The present template, TD, should not be a definition. If it | |
9514 | were a definition, we should be using it! Note that we | |
9515 | cannot restructure the loop to just keep going until we find | |
9516 | a template with a definition, since that might go too far if | |
9517 | a specialization was declared, but not defined. */ | |
4d85e00e MM |
9518 | my_friendly_assert (!(TREE_CODE (d) == VAR_DECL |
9519 | && !DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (td))), | |
9520 | 0); | |
9521 | ||
9522 | /* Fetch the more general template. */ | |
9523 | td = DECL_TI_TEMPLATE (td); | |
9524 | } | |
27bb8339 | 9525 | |
fee23f54 | 9526 | code_pattern = DECL_TEMPLATE_RESULT (td); |
27bb8339 | 9527 | |
5566b478 | 9528 | if (TREE_CODE (d) == FUNCTION_DECL) |
39c76b4f | 9529 | pattern_defined = (DECL_SAVED_TREE (code_pattern) != NULL_TREE); |
5566b478 | 9530 | else |
36a117a5 | 9531 | pattern_defined = ! DECL_IN_AGGR_P (code_pattern); |
de22184b MS |
9532 | |
9533 | push_to_top_level (); | |
9534 | lineno = DECL_SOURCE_LINE (d); | |
9535 | input_filename = DECL_SOURCE_FILE (d); | |
9536 | ||
de22184b | 9537 | if (pattern_defined) |
5566b478 MS |
9538 | { |
9539 | repo_template_used (d); | |
9540 | ||
9541 | if (flag_external_templates && ! DECL_INTERFACE_KNOWN (d)) | |
9542 | { | |
9543 | if (flag_alt_external_templates) | |
9544 | { | |
9545 | if (interface_unknown) | |
9546 | warn_if_unknown_interface (d); | |
9547 | } | |
fee23f54 | 9548 | else if (DECL_INTERFACE_KNOWN (code_pattern)) |
5566b478 MS |
9549 | { |
9550 | DECL_INTERFACE_KNOWN (d) = 1; | |
fee23f54 | 9551 | DECL_NOT_REALLY_EXTERN (d) = ! DECL_EXTERNAL (code_pattern); |
5566b478 MS |
9552 | } |
9553 | else | |
fee23f54 | 9554 | warn_if_unknown_interface (code_pattern); |
5566b478 MS |
9555 | } |
9556 | ||
e92cc029 | 9557 | if (at_eof) |
5566b478 MS |
9558 | import_export_decl (d); |
9559 | } | |
9560 | ||
c4ae3f91 JM |
9561 | /* Reject all external templates except inline functions. */ |
9562 | if (DECL_INTERFACE_KNOWN (d) | |
9563 | && ! DECL_NOT_REALLY_EXTERN (d) | |
9564 | && ! (TREE_CODE (d) == FUNCTION_DECL && DECL_INLINE (d))) | |
9565 | goto out; | |
9566 | ||
16d53b64 MM |
9567 | /* We need to set up DECL_INITIAL regardless of pattern_defined if |
9568 | the variable is a static const initialized in the class body. */ | |
67ffc812 | 9569 | if (TREE_CODE (d) == VAR_DECL |
711734a9 | 9570 | && TREE_READONLY (d) |
67ffc812 MM |
9571 | && DECL_INITIAL (d) == NULL_TREE |
9572 | && DECL_INITIAL (code_pattern) != NULL_TREE) | |
16d53b64 MM |
9573 | ; |
9574 | /* Defer all other templates, unless we have been explicitly | |
9575 | forbidden from doing so. We restore the source position here | |
9576 | because it's used by add_pending_template. */ | |
9577 | else if (! pattern_defined || defer_ok) | |
9578 | { | |
c27be9b9 JM |
9579 | lineno = line; |
9580 | input_filename = file; | |
9581 | ||
03d0f4af MM |
9582 | if (at_eof && !pattern_defined |
9583 | && DECL_EXPLICIT_INSTANTIATION (d)) | |
9584 | /* [temp.explicit] | |
9585 | ||
9586 | The definition of a non-exported function template, a | |
9587 | non-exported member function template, or a non-exported | |
9588 | member function or static data member of a class template | |
9589 | shall be present in every translation unit in which it is | |
9590 | explicitly instantiated. */ | |
8251199e | 9591 | cp_error ("explicit instantiation of `%D' but no definition available", |
03d0f4af MM |
9592 | d); |
9593 | ||
5566b478 | 9594 | add_pending_template (d); |
de22184b | 9595 | goto out; |
5566b478 MS |
9596 | } |
9597 | ||
2b0a63a3 MM |
9598 | /* We're now committed to instantiating this template. Mark it as |
9599 | instantiated so that recursive calls to instantiate_decl do not | |
9600 | try to instantiate it again. */ | |
fbf1c34b | 9601 | DECL_TEMPLATE_INSTANTIATED (d) = 1; |
120722ac | 9602 | |
2b0a63a3 MM |
9603 | /* Regenerate the declaration in case the template has been modified |
9604 | by a subsequent redeclaration. */ | |
9605 | regenerate_decl_from_template (d, td); | |
9606 | ||
120722ac MM |
9607 | /* We already set the file and line above. Reset them now in case |
9608 | they changed as a result of calling regenerate_decl_from_template. */ | |
5156628f MS |
9609 | lineno = DECL_SOURCE_LINE (d); |
9610 | input_filename = DECL_SOURCE_FILE (d); | |
9611 | ||
5566b478 MS |
9612 | if (TREE_CODE (d) == VAR_DECL) |
9613 | { | |
9614 | DECL_IN_AGGR_P (d) = 0; | |
9615 | if (DECL_INTERFACE_KNOWN (d)) | |
9616 | DECL_EXTERNAL (d) = ! DECL_NOT_REALLY_EXTERN (d); | |
9617 | else | |
9618 | { | |
9619 | DECL_EXTERNAL (d) = 1; | |
9620 | DECL_NOT_REALLY_EXTERN (d) = 1; | |
9621 | } | |
cd9f6678 | 9622 | cp_finish_decl (d, DECL_INITIAL (d), NULL_TREE, 0); |
5566b478 MS |
9623 | } |
9624 | else if (TREE_CODE (d) == FUNCTION_DECL) | |
9625 | { | |
6dfbb909 MM |
9626 | /* Set up the list of local specializations. */ |
9627 | my_friendly_assert (local_specializations == NULL, 20000422); | |
9628 | local_specializations = htab_create (37, | |
9629 | htab_hash_pointer, | |
9630 | htab_eq_pointer, | |
9631 | NULL); | |
9632 | ||
558475f0 | 9633 | /* Set up context. */ |
a8f73d4b | 9634 | start_function (NULL_TREE, d, NULL_TREE, SF_PRE_PARSED); |
5566b478 MS |
9635 | store_parm_decls (); |
9636 | ||
f9817201 MM |
9637 | /* We already set up __FUNCTION__, etc., so we don't want to do |
9638 | it again now. */ | |
9639 | current_function_name_declared = 1; | |
9640 | ||
558475f0 MM |
9641 | /* Substitute into the body of the function. */ |
9642 | tsubst_expr (DECL_SAVED_TREE (code_pattern), args, | |
9643 | /*complain=*/1, tmpl); | |
9644 | ||
6dfbb909 MM |
9645 | /* We don't need the local specializations any more. */ |
9646 | htab_delete (local_specializations); | |
9647 | local_specializations = NULL; | |
9648 | ||
4d6abc1c | 9649 | /* Finish the function. */ |
0acf7199 | 9650 | expand_body (finish_function (0)); |
5566b478 MS |
9651 | } |
9652 | ||
971cbc14 MM |
9653 | /* We're not deferring instantiation any more. */ |
9654 | TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d)) = 0; | |
9655 | ||
de22184b | 9656 | out: |
c27be9b9 JM |
9657 | lineno = line; |
9658 | input_filename = file; | |
9659 | ||
5566b478 | 9660 | pop_from_top_level (); |
5566b478 | 9661 | pop_tinst_level (); |
a28e3c7f | 9662 | |
a28e3c7f MS |
9663 | return d; |
9664 | } | |
5566b478 | 9665 | |
0aafb128 MM |
9666 | /* Run through the list of templates that we wish we could |
9667 | instantiate, and instantiate any we can. */ | |
9668 | ||
9669 | int | |
9670 | instantiate_pending_templates () | |
9671 | { | |
9672 | tree *t; | |
9673 | int instantiated_something = 0; | |
9674 | int reconsider; | |
9675 | ||
9676 | do | |
9677 | { | |
9678 | reconsider = 0; | |
9679 | ||
9680 | t = &pending_templates; | |
9681 | while (*t) | |
9682 | { | |
9683 | tree srcloc = TREE_PURPOSE (*t); | |
9684 | tree instantiation = TREE_VALUE (*t); | |
9685 | ||
9686 | input_filename = SRCLOC_FILE (srcloc); | |
9687 | lineno = SRCLOC_LINE (srcloc); | |
9688 | ||
2f939d94 | 9689 | if (TYPE_P (instantiation)) |
0aafb128 MM |
9690 | { |
9691 | tree fn; | |
9692 | ||
d0f062fb | 9693 | if (!COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9694 | { |
9695 | instantiate_class_template (instantiation); | |
9696 | if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation)) | |
9697 | for (fn = TYPE_METHODS (instantiation); | |
9698 | fn; | |
9699 | fn = TREE_CHAIN (fn)) | |
9700 | if (! DECL_ARTIFICIAL (fn)) | |
16d53b64 | 9701 | instantiate_decl (fn, /*defer_ok=*/0); |
d0f062fb | 9702 | if (COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9703 | { |
9704 | instantiated_something = 1; | |
9705 | reconsider = 1; | |
9706 | } | |
9707 | } | |
9708 | ||
d0f062fb | 9709 | if (COMPLETE_TYPE_P (instantiation)) |
0aafb128 MM |
9710 | /* If INSTANTIATION has been instantiated, then we don't |
9711 | need to consider it again in the future. */ | |
9712 | *t = TREE_CHAIN (*t); | |
9713 | else | |
9714 | t = &TREE_CHAIN (*t); | |
9715 | } | |
9716 | else | |
9717 | { | |
16d53b64 | 9718 | if (!DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
9719 | && !DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9720 | { | |
16d53b64 MM |
9721 | instantiation = instantiate_decl (instantiation, |
9722 | /*defer_ok=*/0); | |
0aafb128 MM |
9723 | if (DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9724 | { | |
9725 | instantiated_something = 1; | |
9726 | reconsider = 1; | |
9727 | } | |
9728 | } | |
9729 | ||
16d53b64 | 9730 | if (DECL_TEMPLATE_SPECIALIZATION (instantiation) |
0aafb128 MM |
9731 | || DECL_TEMPLATE_INSTANTIATED (instantiation)) |
9732 | /* If INSTANTIATION has been instantiated, then we don't | |
9733 | need to consider it again in the future. */ | |
9734 | *t = TREE_CHAIN (*t); | |
9735 | else | |
9736 | t = &TREE_CHAIN (*t); | |
9737 | } | |
9738 | } | |
9739 | template_tail = t; | |
9740 | ||
9741 | /* Go through the things that are template instantiations if we are | |
9742 | using guiding declarations. */ | |
9743 | t = &maybe_templates; | |
9744 | while (*t) | |
9745 | { | |
9746 | tree template; | |
9747 | tree fn; | |
9748 | tree args; | |
9749 | ||
9750 | fn = TREE_VALUE (*t); | |
9751 | ||
9752 | if (DECL_INITIAL (fn)) | |
9753 | /* If the FN is already defined, then it was either already | |
9754 | instantiated or, even though guiding declarations were | |
9755 | allowed, a non-template definition was provided. */ | |
9756 | ; | |
9757 | else | |
9758 | { | |
9759 | template = TREE_PURPOSE (*t); | |
9760 | args = get_bindings (template, fn, NULL_TREE); | |
9761 | fn = instantiate_template (template, args); | |
16d53b64 | 9762 | instantiate_decl (fn, /*defer_ok=*/0); |
0aafb128 MM |
9763 | reconsider = 1; |
9764 | } | |
9765 | ||
9766 | /* Remove this entry from the chain. */ | |
9767 | *t = TREE_CHAIN (*t); | |
9768 | } | |
9769 | maybe_template_tail = t; | |
9770 | } | |
9771 | while (reconsider); | |
9772 | ||
9773 | return instantiated_something; | |
9774 | } | |
9775 | ||
4393e105 MM |
9776 | /* Substitute ARGVEC into T, which is a TREE_LIST. In particular, it |
9777 | is an initializer list: the TREE_PURPOSEs are DECLs, and the | |
9778 | TREE_VALUEs are initializer values. Used by instantiate_decl. */ | |
9779 | ||
824b9a4c | 9780 | static tree |
5566b478 MS |
9781 | tsubst_expr_values (t, argvec) |
9782 | tree t, argvec; | |
9783 | { | |
9784 | tree first = NULL_TREE; | |
9785 | tree *p = &first; | |
9786 | ||
9787 | for (; t; t = TREE_CHAIN (t)) | |
9788 | { | |
4393e105 MM |
9789 | tree pur = tsubst_copy (TREE_PURPOSE (t), argvec, |
9790 | /*complain=*/1, NULL_TREE); | |
9791 | tree val = tsubst_expr (TREE_VALUE (t), argvec, /*complain=*/1, | |
9792 | NULL_TREE); | |
5566b478 MS |
9793 | *p = build_tree_list (pur, val); |
9794 | p = &TREE_CHAIN (*p); | |
9795 | } | |
9796 | return first; | |
9797 | } | |
9798 | ||
73aad9b9 JM |
9799 | /* D is an undefined function declaration in the presence of templates with |
9800 | the same name, listed in FNS. If one of them can produce D as an | |
9801 | instantiation, remember this so we can instantiate it at EOF if D has | |
9802 | not been defined by that time. */ | |
9803 | ||
9804 | void | |
9805 | add_maybe_template (d, fns) | |
9806 | tree d, fns; | |
9807 | { | |
9808 | tree t; | |
9809 | ||
9810 | if (DECL_MAYBE_TEMPLATE (d)) | |
9811 | return; | |
9812 | ||
e1467ff2 | 9813 | t = most_specialized (fns, d, NULL_TREE); |
73aad9b9 JM |
9814 | if (! t) |
9815 | return; | |
9816 | if (t == error_mark_node) | |
9817 | { | |
8251199e | 9818 | cp_error ("ambiguous template instantiation for `%D'", d); |
73aad9b9 JM |
9819 | return; |
9820 | } | |
9821 | ||
e1b3e07d | 9822 | *maybe_template_tail = tree_cons (t, d, NULL_TREE); |
73aad9b9 JM |
9823 | maybe_template_tail = &TREE_CHAIN (*maybe_template_tail); |
9824 | DECL_MAYBE_TEMPLATE (d) = 1; | |
9825 | } | |
b87692e5 | 9826 | |
61a127b3 MM |
9827 | /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */ |
9828 | ||
9829 | static void | |
9830 | set_current_access_from_decl (decl) | |
9831 | tree decl; | |
9832 | { | |
9833 | if (TREE_PRIVATE (decl)) | |
9834 | current_access_specifier = access_private_node; | |
9835 | else if (TREE_PROTECTED (decl)) | |
9836 | current_access_specifier = access_protected_node; | |
9837 | else | |
9838 | current_access_specifier = access_public_node; | |
9839 | } | |
9840 | ||
dbfe2124 MM |
9841 | /* Instantiate an enumerated type. TAG is the template type, NEWTAG |
9842 | is the instantiation (which should have been created with | |
9843 | start_enum) and ARGS are the template arguments to use. */ | |
b87692e5 | 9844 | |
dbfe2124 MM |
9845 | static void |
9846 | tsubst_enum (tag, newtag, args) | |
9847 | tree tag; | |
9848 | tree newtag; | |
9849 | tree args; | |
b87692e5 | 9850 | { |
dbfe2124 | 9851 | tree e; |
b87692e5 MS |
9852 | |
9853 | for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e)) | |
9854 | { | |
61a127b3 | 9855 | tree value; |
58595203 | 9856 | |
61a127b3 MM |
9857 | /* Note that in a template enum, the TREE_VALUE is the |
9858 | CONST_DECL, not the corresponding INTEGER_CST. */ | |
9859 | value = tsubst_expr (DECL_INITIAL (TREE_VALUE (e)), | |
4393e105 MM |
9860 | args, /*complain=*/1, |
9861 | NULL_TREE); | |
61a127b3 MM |
9862 | |
9863 | /* Give this enumeration constant the correct access. */ | |
9864 | set_current_access_from_decl (TREE_VALUE (e)); | |
9865 | ||
9866 | /* Actually build the enumerator itself. */ | |
58595203 | 9867 | build_enumerator (TREE_PURPOSE (e), value, newtag); |
dbfe2124 | 9868 | } |
b3d5a58b | 9869 | |
dbfe2124 | 9870 | finish_enum (newtag); |
b87692e5 | 9871 | } |
36a117a5 MM |
9872 | |
9873 | /* Set the DECL_ASSEMBLER_NAME for DECL, which is a FUNCTION_DECL that | |
9874 | is either an instantiation or specialization of a template | |
9875 | function. */ | |
9876 | ||
9877 | static void | |
9878 | set_mangled_name_for_template_decl (decl) | |
9879 | tree decl; | |
9880 | { | |
9881 | tree saved_namespace; | |
b370501f | 9882 | tree context = NULL_TREE; |
36a117a5 MM |
9883 | tree fn_type; |
9884 | tree ret_type; | |
9885 | tree parm_types; | |
9886 | tree tparms; | |
9887 | tree targs; | |
9888 | tree tmpl; | |
9889 | int parm_depth; | |
9890 | ||
9891 | my_friendly_assert (TREE_CODE (decl) == FUNCTION_DECL, 0); | |
9892 | my_friendly_assert (DECL_TEMPLATE_INFO (decl) != NULL_TREE, 0); | |
9893 | ||
9894 | /* The names of template functions must be mangled so as to indicate | |
9895 | what template is being specialized with what template arguments. | |
9896 | For example, each of the following three functions must get | |
9897 | different mangled names: | |
9898 | ||
9899 | void f(int); | |
9900 | template <> void f<7>(int); | |
9901 | template <> void f<8>(int); */ | |
9902 | ||
9903 | targs = DECL_TI_ARGS (decl); | |
9904 | if (uses_template_parms (targs)) | |
9905 | /* This DECL is for a partial instantiation. There's no need to | |
9906 | mangle the name of such an entity. */ | |
9907 | return; | |
9908 | ||
9909 | tmpl = most_general_template (DECL_TI_TEMPLATE (decl)); | |
9910 | tparms = DECL_TEMPLATE_PARMS (tmpl); | |
9911 | parm_depth = TMPL_PARMS_DEPTH (tparms); | |
9912 | ||
9913 | /* There should be as many levels of arguments as there are levels | |
9914 | of parameters. */ | |
9915 | my_friendly_assert (parm_depth == TMPL_ARGS_DEPTH (targs), 0); | |
9916 | ||
9917 | /* We now compute the PARMS and RET_TYPE to give to | |
9918 | build_decl_overload_real. The PARMS and RET_TYPE are the | |
9919 | parameter and return types of the template, after all but the | |
9920 | innermost template arguments have been substituted, not the | |
9921 | parameter and return types of the function DECL. For example, | |
9922 | given: | |
9923 | ||
9924 | template <class T> T f(T); | |
9925 | ||
9926 | both PARMS and RET_TYPE should be `T' even if DECL is `int f(int)'. | |
9927 | A more subtle example is: | |
9928 | ||
9929 | template <class T> struct S { template <class U> void f(T, U); } | |
9930 | ||
9931 | Here, if DECL is `void S<int>::f(int, double)', PARMS should be | |
9932 | {int, U}. Thus, the args that we want to subsitute into the | |
9933 | return and parameter type for the function are those in TARGS, | |
9934 | with the innermost level omitted. */ | |
9935 | fn_type = TREE_TYPE (tmpl); | |
9936 | if (DECL_STATIC_FUNCTION_P (decl)) | |
4f1c5b7d | 9937 | context = DECL_CONTEXT (decl); |
36a117a5 MM |
9938 | |
9939 | if (parm_depth == 1) | |
9940 | /* No substitution is necessary. */ | |
9941 | ; | |
9942 | else | |
9943 | { | |
9944 | int i; | |
9945 | tree partial_args; | |
9946 | ||
9947 | /* Replace the innermost level of the TARGS with NULL_TREEs to | |
9948 | let tsubst know not to subsitute for those parameters. */ | |
f31c0a32 | 9949 | partial_args = make_tree_vec (TREE_VEC_LENGTH (targs)); |
36a117a5 MM |
9950 | for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i) |
9951 | SET_TMPL_ARGS_LEVEL (partial_args, i, | |
9952 | TMPL_ARGS_LEVEL (targs, i)); | |
9953 | SET_TMPL_ARGS_LEVEL (partial_args, | |
9954 | TMPL_ARGS_DEPTH (targs), | |
f31c0a32 | 9955 | make_tree_vec (DECL_NTPARMS (tmpl))); |
36a117a5 MM |
9956 | |
9957 | /* Now, do the (partial) substitution to figure out the | |
9958 | appropriate function type. */ | |
4393e105 | 9959 | fn_type = tsubst (fn_type, partial_args, /*complain=*/1, NULL_TREE); |
36a117a5 | 9960 | if (DECL_STATIC_FUNCTION_P (decl)) |
4393e105 | 9961 | context = tsubst (context, partial_args, /*complain=*/1, NULL_TREE); |
36a117a5 MM |
9962 | |
9963 | /* Substitute into the template parameters to obtain the real | |
9964 | innermost set of parameters. This step is important if the | |
9965 | innermost set of template parameters contains value | |
9966 | parameters whose types depend on outer template parameters. */ | |
9967 | TREE_VEC_LENGTH (partial_args)--; | |
4393e105 | 9968 | tparms = tsubst_template_parms (tparms, partial_args, /*complain=*/1); |
36a117a5 MM |
9969 | } |
9970 | ||
9971 | /* Now, get the innermost parameters and arguments, and figure out | |
9972 | the parameter and return types. */ | |
9973 | tparms = INNERMOST_TEMPLATE_PARMS (tparms); | |
9974 | targs = innermost_args (targs); | |
9975 | ret_type = TREE_TYPE (fn_type); | |
9976 | parm_types = TYPE_ARG_TYPES (fn_type); | |
9977 | ||
9978 | /* For a static member function, we generate a fake `this' pointer, | |
9979 | for the purposes of mangling. This indicates of which class the | |
9980 | function is a member. Because of: | |
9981 | ||
9982 | [class.static] | |
9983 | ||
9984 | There shall not be a static and a nonstatic member function | |
9985 | with the same name and the same parameter types | |
9986 | ||
9987 | we don't have to worry that this will result in a clash with a | |
9988 | non-static member function. */ | |
9989 | if (DECL_STATIC_FUNCTION_P (decl)) | |
9990 | parm_types = hash_tree_chain (build_pointer_type (context), parm_types); | |
9991 | ||
9992 | /* There should be the same number of template parameters as | |
9993 | template arguments. */ | |
9994 | my_friendly_assert (TREE_VEC_LENGTH (tparms) == TREE_VEC_LENGTH (targs), | |
9995 | 0); | |
9996 | ||
9997 | /* If the template is in a namespace, we need to put that into the | |
9998 | mangled name. Unfortunately, build_decl_overload_real does not | |
9999 | get the decl to mangle, so it relies on the current | |
10000 | namespace. Therefore, we set that here temporarily. */ | |
2f939d94 | 10001 | my_friendly_assert (DECL_P (decl), 980702); |
36a117a5 MM |
10002 | saved_namespace = current_namespace; |
10003 | current_namespace = CP_DECL_CONTEXT (decl); | |
10004 | ||
10005 | /* Actually set the DCL_ASSEMBLER_NAME. */ | |
10006 | DECL_ASSEMBLER_NAME (decl) | |
10007 | = build_decl_overload_real (DECL_NAME (decl), parm_types, ret_type, | |
10008 | tparms, targs, | |
10009 | DECL_FUNCTION_MEMBER_P (decl) | |
db9b2174 | 10010 | + DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)); |
36a117a5 MM |
10011 | |
10012 | /* Restore the previously active namespace. */ | |
10013 | current_namespace = saved_namespace; | |
10014 | } |