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8d08fdba | 1 | /* Handle parameterized types (templates) for GNU C++. |
4c571114 | 2 | Copyright (C) 1992, 93-97, 1998, 1999 Free Software Foundation, Inc. |
8d08fdba | 3 | Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing. |
fc378698 | 4 | Rewritten by Jason Merrill (jason@cygnus.com). |
8d08fdba MS |
5 | |
6 | This file is part of GNU CC. | |
7 | ||
8 | GNU CC is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU CC is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU CC; see the file COPYING. If not, write to | |
e9fa0c7c RK |
20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
21 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
22 | |
23 | /* Known bugs or deficiencies include: | |
e92cc029 | 24 | |
e92cc029 MS |
25 | all methods must be provided in header files; can't use a source |
26 | file that contains only the method templates and "just win". */ | |
8d08fdba MS |
27 | |
28 | #include "config.h" | |
8d052bc7 | 29 | #include "system.h" |
8d08fdba MS |
30 | #include "obstack.h" |
31 | ||
32 | #include "tree.h" | |
33 | #include "flags.h" | |
34 | #include "cp-tree.h" | |
35 | #include "decl.h" | |
36 | #include "parse.h" | |
f0e01782 | 37 | #include "lex.h" |
e8abc66f | 38 | #include "output.h" |
a9aedbc2 | 39 | #include "defaults.h" |
49c249e1 | 40 | #include "except.h" |
54f92bfb | 41 | #include "toplev.h" |
49c249e1 | 42 | |
050367a3 MM |
43 | /* The type of functions taking a tree, and some additional data, and |
44 | returning an int. */ | |
45 | typedef int (*tree_fn_t) PROTO((tree, void*)); | |
46 | ||
8d08fdba | 47 | extern struct obstack permanent_obstack; |
8d08fdba MS |
48 | |
49 | extern int lineno; | |
50 | extern char *input_filename; | |
51 | struct pending_inline *pending_template_expansions; | |
52 | ||
5566b478 MS |
53 | tree current_template_parms; |
54 | HOST_WIDE_INT processing_template_decl; | |
8d08fdba | 55 | |
5566b478 MS |
56 | tree pending_templates; |
57 | static tree *template_tail = &pending_templates; | |
58 | ||
73aad9b9 JM |
59 | tree maybe_templates; |
60 | static tree *maybe_template_tail = &maybe_templates; | |
61 | ||
5566b478 | 62 | int minimal_parse_mode; |
75b0bbce | 63 | |
92eca640 | 64 | int processing_specialization; |
75650646 | 65 | int processing_explicit_instantiation; |
67ffc812 | 66 | int processing_template_parmlist; |
386b8a85 JM |
67 | static int template_header_count; |
68 | ||
75650646 MM |
69 | static tree saved_trees; |
70 | ||
8d08fdba MS |
71 | #define obstack_chunk_alloc xmalloc |
72 | #define obstack_chunk_free free | |
73 | ||
830bfa74 MM |
74 | #define UNIFY_ALLOW_NONE 0 |
75 | #define UNIFY_ALLOW_MORE_CV_QUAL 1 | |
76 | #define UNIFY_ALLOW_LESS_CV_QUAL 2 | |
77 | #define UNIFY_ALLOW_DERIVED 4 | |
161c12b0 | 78 | #define UNIFY_ALLOW_INTEGER 8 |
830bfa74 | 79 | |
34016c81 JM |
80 | static int unify PROTO((tree, tree, tree, tree, int, int*)); |
81 | static int resolve_overloaded_unification PROTO((tree, tree, tree, tree, | |
82 | unification_kind_t, int, | |
83 | int*)); | |
e97e5263 | 84 | static int try_one_overload PROTO((tree, tree, tree, tree, tree, |
34016c81 | 85 | unification_kind_t, int, int*)); |
830bfa74 | 86 | static int unify PROTO((tree, tree, tree, tree, int, int*)); |
49c249e1 JM |
87 | static void add_pending_template PROTO((tree)); |
88 | static int push_tinst_level PROTO((tree)); | |
89 | static tree classtype_mangled_name PROTO((tree)); | |
36a117a5 | 90 | static char *mangle_class_name_for_template PROTO((char *, tree, tree)); |
49c249e1 | 91 | static tree tsubst_expr_values PROTO((tree, tree)); |
49c249e1 | 92 | static int list_eq PROTO((tree, tree)); |
36a117a5 | 93 | static tree get_class_bindings PROTO((tree, tree, tree)); |
744fac59 | 94 | static tree coerce_template_parms PROTO((tree, tree, tree, int, int)); |
dbfe2124 | 95 | static void tsubst_enum PROTO((tree, tree, tree)); |
98c1c668 | 96 | static tree add_to_template_args PROTO((tree, tree)); |
36a117a5 | 97 | static tree add_outermost_template_args PROTO((tree, tree)); |
830bfa74 MM |
98 | static void maybe_adjust_types_for_deduction PROTO((unification_kind_t, tree*, |
99 | tree*)); | |
050367a3 | 100 | static int type_unification_real PROTO((tree, tree, tree, tree, |
830bfa74 | 101 | int, unification_kind_t, int, int*)); |
386b8a85 | 102 | static void note_template_header PROTO((int)); |
840b09b4 | 103 | static tree maybe_fold_nontype_arg PROTO((tree)); |
e1467ff2 | 104 | static tree convert_nontype_argument PROTO((tree, tree)); |
8b5b8b7c MM |
105 | static tree convert_template_argument PROTO ((tree, tree, tree, int, |
106 | int , tree)); | |
76b9a14d | 107 | static tree get_bindings_overload PROTO((tree, tree, tree)); |
050367a3 | 108 | static int for_each_template_parm PROTO((tree, tree_fn_t, void*)); |
4b580446 | 109 | static tree build_template_parm_index PROTO((int, int, int, tree, tree)); |
69ac77ce JL |
110 | static int inline_needs_template_parms PROTO((tree)); |
111 | static void push_inline_template_parms_recursive PROTO((tree, int)); | |
112 | static tree retrieve_specialization PROTO((tree, tree)); | |
36a117a5 MM |
113 | static tree register_specialization PROTO((tree, tree, tree)); |
114 | static int unregister_specialization PROTO((tree, tree)); | |
69ac77ce JL |
115 | static tree reduce_template_parm_level PROTO((tree, tree, int)); |
116 | static tree build_template_decl PROTO((tree, tree)); | |
117 | static int mark_template_parm PROTO((tree, void *)); | |
118 | static tree tsubst_friend_function PROTO((tree, tree)); | |
6757edfe | 119 | static tree tsubst_friend_class PROTO((tree, tree)); |
69ac77ce | 120 | static tree get_bindings_real PROTO((tree, tree, tree, int)); |
04a81d94 | 121 | static int template_decl_level PROTO((tree)); |
a2b60a0e | 122 | static tree maybe_get_template_decl_from_type_decl PROTO((tree)); |
830bfa74 MM |
123 | static int check_cv_quals_for_unify PROTO((int, tree, tree)); |
124 | static tree tsubst_template_arg_vector PROTO((tree, tree)); | |
36a117a5 | 125 | static tree tsubst_template_parms PROTO((tree, tree)); |
830bfa74 | 126 | static void regenerate_decl_from_template PROTO((tree, tree)); |
36a117a5 MM |
127 | static tree most_specialized PROTO((tree, tree, tree)); |
128 | static tree most_specialized_class PROTO((tree, tree)); | |
129 | static tree most_general_template PROTO((tree)); | |
130 | static void set_mangled_name_for_template_decl PROTO((tree)); | |
39c01e4c | 131 | static int template_class_depth_real PROTO((tree, int)); |
ae58fa02 MM |
132 | static tree tsubst_aggr_type PROTO((tree, tree, tree, int)); |
133 | static tree tsubst_decl PROTO((tree, tree, tree, tree)); | |
cabc336a | 134 | static tree tsubst_arg_types PROTO((tree, tree, tree)); |
6c30752f MM |
135 | static void check_specialization_scope PROTO((void)); |
136 | static tree process_partial_specialization PROTO((tree)); | |
61a127b3 | 137 | static void set_current_access_from_decl PROTO((tree)); |
6ba89f8e | 138 | static void check_default_tmpl_args PROTO((tree, tree, int, int)); |
36a117a5 MM |
139 | |
140 | /* We use TREE_VECs to hold template arguments. If there is only one | |
141 | level of template arguments, then the TREE_VEC contains the | |
142 | arguments directly. If there is more than one level of template | |
143 | arguments, then each entry in the TREE_VEC is itself a TREE_VEC, | |
144 | containing the template arguments for a single level. The first | |
145 | entry in the outer TREE_VEC is the outermost level of template | |
146 | parameters; the last is the innermost. | |
147 | ||
148 | It is incorrect to ever form a template argument vector containing | |
149 | only one level of arguments, but which is a TREE_VEC containing as | |
150 | its only entry the TREE_VEC for that level. */ | |
151 | ||
36a117a5 MM |
152 | /* Non-zero if the template arguments is actually a vector of vectors, |
153 | rather than just a vector. */ | |
154 | #define TMPL_ARGS_HAVE_MULTIPLE_LEVELS(NODE) \ | |
155 | (NODE != NULL_TREE \ | |
156 | && TREE_CODE (NODE) == TREE_VEC \ | |
157 | && TREE_VEC_LENGTH (NODE) > 0 \ | |
158 | && TREE_VEC_ELT (NODE, 0) != NULL_TREE \ | |
67ffc812 MM |
159 | && TREE_CODE (TREE_VEC_ELT (NODE, 0)) == TREE_VEC) |
160 | ||
e4a84209 MM |
161 | /* The depth of a template argument vector. When called directly by |
162 | the parser, we use a TREE_LIST rather than a TREE_VEC to represent | |
163 | template arguments. In fact, we may even see NULL_TREE if there | |
164 | are no template arguments. In both of those cases, there is only | |
165 | one level of template arguments. */ | |
166 | #define TMPL_ARGS_DEPTH(NODE) \ | |
167 | (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (NODE) ? TREE_VEC_LENGTH (NODE) : 1) | |
168 | ||
36a117a5 MM |
169 | /* The LEVELth level of the template ARGS. Note that template |
170 | parameter levels are indexed from 1, not from 0. */ | |
171 | #define TMPL_ARGS_LEVEL(ARGS, LEVEL) \ | |
172 | (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (ARGS) \ | |
173 | ? TREE_VEC_ELT ((ARGS), (LEVEL) - 1) : ARGS) | |
174 | ||
175 | /* Set the LEVELth level of the template ARGS to VAL. This macro does | |
176 | not work with single-level argument vectors. */ | |
177 | #define SET_TMPL_ARGS_LEVEL(ARGS, LEVEL, VAL) \ | |
178 | (TREE_VEC_ELT ((ARGS), (LEVEL) - 1) = (VAL)) | |
179 | ||
180 | /* Accesses the IDXth parameter in the LEVELth level of the ARGS. */ | |
181 | #define TMPL_ARG(ARGS, LEVEL, IDX) \ | |
182 | (TREE_VEC_ELT (TMPL_ARGS_LEVEL (ARGS, LEVEL), IDX)) | |
183 | ||
184 | /* Set the IDXth element in the LEVELth level of ARGS to VAL. This | |
185 | macro does not work with single-level argument vectors. */ | |
186 | #define SET_TMPL_ARG(ARGS, LEVEL, IDX, VAL) \ | |
187 | (TREE_VEC_ELT (TREE_VEC_ELT ((ARGS), (LEVEL) - 1), (IDX)) = (VAL)) | |
188 | ||
e4a84209 MM |
189 | /* Given a single level of template arguments in NODE, return the |
190 | number of arguments. */ | |
191 | #define NUM_TMPL_ARGS(NODE) \ | |
192 | ((NODE) == NULL_TREE ? 0 \ | |
193 | : (TREE_CODE (NODE) == TREE_VEC \ | |
194 | ? TREE_VEC_LENGTH (NODE) : list_length (NODE))) | |
195 | ||
36a117a5 MM |
196 | /* The number of levels of template parameters given by NODE. */ |
197 | #define TMPL_PARMS_DEPTH(NODE) \ | |
198 | (TREE_INT_CST_HIGH (TREE_PURPOSE (NODE))) | |
199 | ||
e1467ff2 MM |
200 | /* Do any processing required when DECL (a member template declaration |
201 | using TEMPLATE_PARAMETERS as its innermost parameter list) is | |
202 | finished. Returns the TEMPLATE_DECL corresponding to DECL, unless | |
203 | it is a specialization, in which case the DECL itself is returned. */ | |
204 | ||
205 | tree | |
61a127b3 | 206 | finish_member_template_decl (decl) |
e1467ff2 MM |
207 | tree decl; |
208 | { | |
93cdc044 JM |
209 | if (decl == NULL_TREE || decl == void_type_node) |
210 | return NULL_TREE; | |
3ddfb0e6 MM |
211 | else if (decl == error_mark_node) |
212 | /* By returning NULL_TREE, the parser will just ignore this | |
213 | declaration. We have already issued the error. */ | |
214 | return NULL_TREE; | |
93cdc044 JM |
215 | else if (TREE_CODE (decl) == TREE_LIST) |
216 | { | |
5f311aec | 217 | /* Assume that the class is the only declspec. */ |
93cdc044 | 218 | decl = TREE_VALUE (decl); |
8d019cef JM |
219 | if (IS_AGGR_TYPE (decl) && CLASSTYPE_TEMPLATE_INFO (decl) |
220 | && ! CLASSTYPE_TEMPLATE_SPECIALIZATION (decl)) | |
93cdc044 JM |
221 | { |
222 | tree tmpl = CLASSTYPE_TI_TEMPLATE (decl); | |
223 | check_member_template (tmpl); | |
224 | return tmpl; | |
225 | } | |
8d019cef | 226 | return NULL_TREE; |
93cdc044 | 227 | } |
a1da6cba | 228 | else if (DECL_TEMPLATE_INFO (decl)) |
e1467ff2 | 229 | { |
a1da6cba MM |
230 | if (!DECL_TEMPLATE_SPECIALIZATION (decl)) |
231 | { | |
232 | check_member_template (DECL_TI_TEMPLATE (decl)); | |
233 | return DECL_TI_TEMPLATE (decl); | |
234 | } | |
235 | else | |
236 | return decl; | |
237 | } | |
238 | else | |
8251199e | 239 | cp_error ("invalid member template declaration `%D'", decl); |
e1467ff2 | 240 | |
a1da6cba | 241 | return error_mark_node; |
f84b4be9 | 242 | } |
e1467ff2 | 243 | |
f84b4be9 JM |
244 | /* Returns the template nesting level of the indicated class TYPE. |
245 | ||
246 | For example, in: | |
247 | template <class T> | |
248 | struct A | |
249 | { | |
250 | template <class U> | |
251 | struct B {}; | |
252 | }; | |
253 | ||
39c01e4c MM |
254 | A<T>::B<U> has depth two, while A<T> has depth one. |
255 | Both A<T>::B<int> and A<int>::B<U> have depth one, if | |
256 | COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not | |
257 | specializations. | |
258 | ||
259 | This function is guaranteed to return 0 if passed NULL_TREE so | |
260 | that, for example, `template_class_depth (current_class_type)' is | |
261 | always safe. */ | |
f84b4be9 JM |
262 | |
263 | int | |
39c01e4c | 264 | template_class_depth_real (type, count_specializations) |
f84b4be9 | 265 | tree type; |
39c01e4c | 266 | int count_specializations; |
f84b4be9 | 267 | { |
93cdc044 | 268 | int depth; |
f84b4be9 | 269 | |
2c73f9f5 | 270 | for (depth = 0; |
ed44da02 MM |
271 | type && TREE_CODE (type) != NAMESPACE_DECL; |
272 | type = (TREE_CODE (type) == FUNCTION_DECL) | |
273 | ? DECL_REAL_CONTEXT (type) : TYPE_CONTEXT (type)) | |
274 | { | |
275 | if (TREE_CODE (type) != FUNCTION_DECL) | |
276 | { | |
277 | if (CLASSTYPE_TEMPLATE_INFO (type) | |
278 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type)) | |
279 | && ((count_specializations | |
280 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (type)) | |
281 | || uses_template_parms (CLASSTYPE_TI_ARGS (type)))) | |
282 | ++depth; | |
283 | } | |
284 | else | |
285 | { | |
286 | if (DECL_TEMPLATE_INFO (type) | |
287 | && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type)) | |
288 | && ((count_specializations | |
289 | && DECL_TEMPLATE_SPECIALIZATION (type)) | |
290 | || uses_template_parms (DECL_TI_ARGS (type)))) | |
291 | ++depth; | |
292 | } | |
293 | } | |
f84b4be9 JM |
294 | |
295 | return depth; | |
e1467ff2 | 296 | } |
98c1c668 | 297 | |
39c01e4c MM |
298 | /* Returns the template nesting level of the indicated class TYPE. |
299 | Like template_class_depth_real, but instantiations do not count in | |
300 | the depth. */ | |
301 | ||
302 | int | |
303 | template_class_depth (type) | |
304 | tree type; | |
305 | { | |
306 | return template_class_depth_real (type, /*count_specializations=*/0); | |
307 | } | |
308 | ||
cae40af6 JM |
309 | /* Returns 1 if processing DECL as part of do_pending_inlines |
310 | needs us to push template parms. */ | |
311 | ||
312 | static int | |
313 | inline_needs_template_parms (decl) | |
314 | tree decl; | |
315 | { | |
316 | if (! DECL_TEMPLATE_INFO (decl)) | |
317 | return 0; | |
f84b4be9 | 318 | |
36a117a5 | 319 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl))) |
cae40af6 JM |
320 | > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl))); |
321 | } | |
322 | ||
323 | /* Subroutine of maybe_begin_member_template_processing. | |
324 | Push the template parms in PARMS, starting from LEVELS steps into the | |
325 | chain, and ending at the beginning, since template parms are listed | |
326 | innermost first. */ | |
327 | ||
328 | static void | |
329 | push_inline_template_parms_recursive (parmlist, levels) | |
330 | tree parmlist; | |
331 | int levels; | |
332 | { | |
333 | tree parms = TREE_VALUE (parmlist); | |
334 | int i; | |
335 | ||
336 | if (levels > 1) | |
337 | push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1); | |
786b5245 | 338 | |
98c1c668 | 339 | ++processing_template_decl; |
cae40af6 | 340 | current_template_parms |
98c1c668 JM |
341 | = tree_cons (build_int_2 (0, processing_template_decl), |
342 | parms, current_template_parms); | |
cae40af6 JM |
343 | TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1; |
344 | ||
786b5245 | 345 | pushlevel (0); |
98c1c668 JM |
346 | for (i = 0; i < TREE_VEC_LENGTH (parms); ++i) |
347 | { | |
786b5245 MM |
348 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
349 | my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (parm)) == 'd', 0); | |
cae40af6 | 350 | |
98c1c668 JM |
351 | switch (TREE_CODE (parm)) |
352 | { | |
786b5245 | 353 | case TYPE_DECL: |
73b0fce8 | 354 | case TEMPLATE_DECL: |
98c1c668 JM |
355 | pushdecl (parm); |
356 | break; | |
786b5245 MM |
357 | |
358 | case PARM_DECL: | |
359 | { | |
fc03edb3 MM |
360 | /* Make a CONST_DECL as is done in process_template_parm. |
361 | It is ugly that we recreate this here; the original | |
362 | version built in process_template_parm is no longer | |
363 | available. */ | |
786b5245 MM |
364 | tree decl = build_decl (CONST_DECL, DECL_NAME (parm), |
365 | TREE_TYPE (parm)); | |
fc03edb3 | 366 | SET_DECL_ARTIFICIAL (decl); |
786b5245 | 367 | DECL_INITIAL (decl) = DECL_INITIAL (parm); |
fc03edb3 | 368 | DECL_TEMPLATE_PARM_P (decl) = 1; |
786b5245 MM |
369 | pushdecl (decl); |
370 | } | |
cae40af6 | 371 | break; |
786b5245 | 372 | |
98c1c668 JM |
373 | default: |
374 | my_friendly_abort (0); | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
cae40af6 JM |
379 | /* Restore the template parameter context for a member template or |
380 | a friend template defined in a class definition. */ | |
381 | ||
382 | void | |
383 | maybe_begin_member_template_processing (decl) | |
384 | tree decl; | |
385 | { | |
386 | tree parms; | |
387 | int levels; | |
388 | ||
389 | if (! inline_needs_template_parms (decl)) | |
390 | return; | |
391 | ||
36a117a5 | 392 | parms = DECL_TEMPLATE_PARMS (most_general_template (decl)); |
cae40af6 | 393 | |
36a117a5 | 394 | levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl; |
cae40af6 JM |
395 | |
396 | if (DECL_TEMPLATE_SPECIALIZATION (decl)) | |
397 | { | |
398 | --levels; | |
399 | parms = TREE_CHAIN (parms); | |
400 | } | |
401 | ||
402 | push_inline_template_parms_recursive (parms, levels); | |
403 | } | |
404 | ||
98c1c668 JM |
405 | /* Undo the effects of begin_member_template_processing. */ |
406 | ||
407 | void | |
b370501f | 408 | maybe_end_member_template_processing () |
98c1c668 JM |
409 | { |
410 | if (! processing_template_decl) | |
411 | return; | |
412 | ||
cae40af6 JM |
413 | while (current_template_parms |
414 | && TEMPLATE_PARMS_FOR_INLINE (current_template_parms)) | |
415 | { | |
416 | --processing_template_decl; | |
417 | current_template_parms = TREE_CHAIN (current_template_parms); | |
418 | poplevel (0, 0, 0); | |
419 | } | |
98c1c668 JM |
420 | } |
421 | ||
cae40af6 | 422 | /* Returns non-zero iff T is a member template function. We must be |
f84b4be9 | 423 | careful as in |
75650646 MM |
424 | |
425 | template <class T> class C { void f(); } | |
426 | ||
427 | Here, f is a template function, and a member, but not a member | |
428 | template. This function does not concern itself with the origin of | |
429 | T, only its present state. So if we have | |
430 | ||
431 | template <class T> class C { template <class U> void f(U); } | |
432 | ||
433 | then neither C<int>::f<char> nor C<T>::f<double> is considered | |
f181d4ae MM |
434 | to be a member template. But, `template <class U> void |
435 | C<int>::f(U)' is considered a member template. */ | |
98c1c668 | 436 | |
cae40af6 JM |
437 | int |
438 | is_member_template (t) | |
98c1c668 JM |
439 | tree t; |
440 | { | |
f181d4ae | 441 | if (!DECL_FUNCTION_TEMPLATE_P (t)) |
75650646 | 442 | /* Anything that isn't a function or a template function is |
aa5f3bad MM |
443 | certainly not a member template. */ |
444 | return 0; | |
445 | ||
cae40af6 JM |
446 | /* A local class can't have member templates. */ |
447 | if (hack_decl_function_context (t)) | |
448 | return 0; | |
449 | ||
f181d4ae | 450 | return (DECL_FUNCTION_MEMBER_P (DECL_TEMPLATE_RESULT (t)) |
f84b4be9 JM |
451 | /* If there are more levels of template parameters than |
452 | there are template classes surrounding the declaration, | |
453 | then we have a member template. */ | |
f181d4ae MM |
454 | && (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
455 | template_class_depth (DECL_CLASS_CONTEXT (t)))); | |
f84b4be9 | 456 | } |
98c1c668 | 457 | |
ba4f4e5d | 458 | #if 0 /* UNUSED */ |
2ee4e084 MM |
459 | /* Returns non-zero iff T is a member template class. See |
460 | is_member_template for a description of what precisely constitutes | |
461 | a member template. */ | |
462 | ||
463 | int | |
464 | is_member_template_class (t) | |
465 | tree t; | |
466 | { | |
467 | if (!DECL_CLASS_TEMPLATE_P (t)) | |
468 | /* Anything that isn't a class template, is certainly not a member | |
469 | template. */ | |
470 | return 0; | |
471 | ||
472 | if (!DECL_CLASS_SCOPE_P (t)) | |
473 | /* Anything whose context isn't a class type is surely not a | |
474 | member template. */ | |
475 | return 0; | |
476 | ||
477 | /* If there are more levels of template parameters than there are | |
478 | template classes surrounding the declaration, then we have a | |
479 | member template. */ | |
36a117a5 | 480 | return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) > |
2ee4e084 MM |
481 | template_class_depth (DECL_CONTEXT (t))); |
482 | } | |
ba4f4e5d | 483 | #endif |
2ee4e084 | 484 | |
36a117a5 MM |
485 | /* Return a new template argument vector which contains all of ARGS, |
486 | but has as its innermost set of arguments the EXTRA_ARGS. The | |
487 | resulting vector will be built on a temporary obstack, and so must | |
488 | be explicitly copied to the permanent obstack, if required. */ | |
e6f1275f JM |
489 | |
490 | static tree | |
36a117a5 MM |
491 | add_to_template_args (args, extra_args) |
492 | tree args; | |
493 | tree extra_args; | |
e6f1275f | 494 | { |
36a117a5 MM |
495 | tree new_args; |
496 | int extra_depth; | |
497 | int i; | |
498 | int j; | |
e6f1275f | 499 | |
36a117a5 MM |
500 | extra_depth = TMPL_ARGS_DEPTH (extra_args); |
501 | new_args = make_temp_vec (TMPL_ARGS_DEPTH (args) + extra_depth); | |
e6f1275f | 502 | |
36a117a5 MM |
503 | for (i = 1; i <= TMPL_ARGS_DEPTH (args); ++i) |
504 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (args, i)); | |
e6f1275f | 505 | |
36a117a5 MM |
506 | for (j = 1; j <= extra_depth; ++j, ++i) |
507 | SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (extra_args, j)); | |
508 | ||
e6f1275f JM |
509 | return new_args; |
510 | } | |
511 | ||
36a117a5 MM |
512 | /* Like add_to_template_args, but only the outermost ARGS are added to |
513 | the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH | |
514 | (EXTRA_ARGS) levels are added. This function is used to combine | |
515 | the template arguments from a partial instantiation with the | |
516 | template arguments used to attain the full instantiation from the | |
517 | partial instantiation. */ | |
98c1c668 | 518 | |
4966381a | 519 | static tree |
36a117a5 | 520 | add_outermost_template_args (args, extra_args) |
98c1c668 JM |
521 | tree args; |
522 | tree extra_args; | |
523 | { | |
524 | tree new_args; | |
525 | ||
e4a84209 MM |
526 | /* If there are more levels of EXTRA_ARGS than there are ARGS, |
527 | something very fishy is going on. */ | |
528 | my_friendly_assert (TMPL_ARGS_DEPTH (args) >= TMPL_ARGS_DEPTH (extra_args), | |
529 | 0); | |
530 | ||
531 | /* If *all* the new arguments will be the EXTRA_ARGS, just return | |
532 | them. */ | |
533 | if (TMPL_ARGS_DEPTH (args) == TMPL_ARGS_DEPTH (extra_args)) | |
534 | return extra_args; | |
535 | ||
36a117a5 MM |
536 | /* For the moment, we make ARGS look like it contains fewer levels. */ |
537 | TREE_VEC_LENGTH (args) -= TMPL_ARGS_DEPTH (extra_args); | |
538 | ||
539 | new_args = add_to_template_args (args, extra_args); | |
98c1c668 | 540 | |
36a117a5 MM |
541 | /* Now, we restore ARGS to its full dimensions. */ |
542 | TREE_VEC_LENGTH (args) += TMPL_ARGS_DEPTH (extra_args); | |
98c1c668 JM |
543 | |
544 | return new_args; | |
545 | } | |
5566b478 MS |
546 | |
547 | /* We've got a template header coming up; push to a new level for storing | |
548 | the parms. */ | |
8d08fdba | 549 | |
8d08fdba MS |
550 | void |
551 | begin_template_parm_list () | |
552 | { | |
6757edfe MM |
553 | /* We use a non-tag-transparent scope here, which causes pushtag to |
554 | put tags in this scope, rather than in the enclosing class or | |
555 | namespace scope. This is the right thing, since we want | |
556 | TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a | |
557 | global template class, push_template_decl handles putting the | |
558 | TEMPLATE_DECL into top-level scope. For a nested template class, | |
559 | e.g.: | |
560 | ||
561 | template <class T> struct S1 { | |
562 | template <class T> struct S2 {}; | |
563 | }; | |
564 | ||
565 | pushtag contains special code to call pushdecl_with_scope on the | |
566 | TEMPLATE_DECL for S2. */ | |
8d08fdba | 567 | pushlevel (0); |
5566b478 | 568 | declare_pseudo_global_level (); |
5156628f | 569 | ++processing_template_decl; |
67ffc812 | 570 | ++processing_template_parmlist; |
386b8a85 JM |
571 | note_template_header (0); |
572 | } | |
573 | ||
6c30752f MM |
574 | /* This routine is called when a specialization is declared. If it is |
575 | illegal to declare a specialization here, an error is reported. */ | |
576 | ||
577 | void | |
578 | check_specialization_scope () | |
579 | { | |
580 | tree scope = current_scope (); | |
3ddfb0e6 | 581 | |
6c30752f MM |
582 | /* [temp.expl.spec] |
583 | ||
584 | An explicit specialization shall be declared in the namespace of | |
585 | which the template is a member, or, for member templates, in the | |
586 | namespace of which the enclosing class or enclosing class | |
587 | template is a member. An explicit specialization of a member | |
588 | function, member class or static data member of a class template | |
589 | shall be declared in the namespace of which the class template | |
590 | is a member. */ | |
591 | if (scope && TREE_CODE (scope) != NAMESPACE_DECL) | |
8251199e | 592 | cp_error ("explicit specialization in non-namespace scope `%D'", |
6c30752f | 593 | scope); |
3ddfb0e6 | 594 | |
6c30752f MM |
595 | /* [temp.expl.spec] |
596 | ||
597 | In an explicit specialization declaration for a member of a class | |
598 | template or a member template that appears in namespace scope, | |
599 | the member template and some of its enclosing class templates may | |
600 | remain unspecialized, except that the declaration shall not | |
601 | explicitly specialize a class member template if its enclosing | |
602 | class templates are not explicitly specialized as well. */ | |
603 | if (current_template_parms) | |
fd4de5ff | 604 | cp_error ("enclosing class templates are not explicitly specialized"); |
6c30752f MM |
605 | } |
606 | ||
386b8a85 JM |
607 | /* We've just seen template <>. */ |
608 | ||
609 | void | |
610 | begin_specialization () | |
611 | { | |
612 | note_template_header (1); | |
6c30752f | 613 | check_specialization_scope (); |
386b8a85 JM |
614 | } |
615 | ||
386b8a85 JM |
616 | /* Called at then end of processing a declaration preceeded by |
617 | template<>. */ | |
618 | ||
619 | void | |
620 | end_specialization () | |
621 | { | |
622 | reset_specialization (); | |
623 | } | |
624 | ||
386b8a85 JM |
625 | /* Any template <>'s that we have seen thus far are not referring to a |
626 | function specialization. */ | |
627 | ||
628 | void | |
629 | reset_specialization () | |
630 | { | |
631 | processing_specialization = 0; | |
632 | template_header_count = 0; | |
633 | } | |
634 | ||
386b8a85 JM |
635 | /* We've just seen a template header. If SPECIALIZATION is non-zero, |
636 | it was of the form template <>. */ | |
637 | ||
4966381a | 638 | static void |
386b8a85 JM |
639 | note_template_header (specialization) |
640 | int specialization; | |
641 | { | |
642 | processing_specialization = specialization; | |
643 | template_header_count++; | |
644 | } | |
645 | ||
75650646 | 646 | /* We're beginning an explicit instantiation. */ |
386b8a85 | 647 | |
75650646 MM |
648 | void |
649 | begin_explicit_instantiation () | |
386b8a85 | 650 | { |
75650646 MM |
651 | ++processing_explicit_instantiation; |
652 | } | |
386b8a85 | 653 | |
386b8a85 | 654 | |
75650646 MM |
655 | void |
656 | end_explicit_instantiation () | |
657 | { | |
658 | my_friendly_assert(processing_explicit_instantiation > 0, 0); | |
659 | --processing_explicit_instantiation; | |
660 | } | |
386b8a85 | 661 | |
36a117a5 MM |
662 | /* The TYPE is being declared. If it is a template type, that means it |
663 | is a partial specialization. Do appropriate error-checking. */ | |
664 | ||
665 | void | |
666 | maybe_process_partial_specialization (type) | |
667 | tree type; | |
668 | { | |
669 | if (IS_AGGR_TYPE (type) && CLASSTYPE_USE_TEMPLATE (type)) | |
670 | { | |
671 | if (CLASSTYPE_IMPLICIT_INSTANTIATION (type) | |
672 | && TYPE_SIZE (type) == NULL_TREE) | |
673 | { | |
674 | SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type); | |
675 | if (processing_template_decl) | |
676 | push_template_decl (TYPE_MAIN_DECL (type)); | |
677 | } | |
678 | else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
8251199e | 679 | cp_error ("specialization of `%T' after instantiation", type); |
36a117a5 MM |
680 | } |
681 | } | |
682 | ||
75650646 MM |
683 | /* Retrieve the specialization (in the sense of [temp.spec] - a |
684 | specialization is either an instantiation or an explicit | |
685 | specialization) of TMPL for the given template ARGS. If there is | |
686 | no such specialization, return NULL_TREE. The ARGS are a vector of | |
687 | arguments, or a vector of vectors of arguments, in the case of | |
688 | templates with more than one level of parameters. */ | |
689 | ||
690 | static tree | |
691 | retrieve_specialization (tmpl, args) | |
692 | tree tmpl; | |
693 | tree args; | |
694 | { | |
695 | tree s; | |
696 | ||
697 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
698 | ||
36a117a5 MM |
699 | /* There should be as many levels of arguments as there are |
700 | levels of parameters. */ | |
701 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
702 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
703 | 0); | |
704 | ||
75650646 MM |
705 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
706 | s != NULL_TREE; | |
707 | s = TREE_CHAIN (s)) | |
708 | if (comp_template_args (TREE_PURPOSE (s), args)) | |
709 | return TREE_VALUE (s); | |
710 | ||
711 | return NULL_TREE; | |
386b8a85 JM |
712 | } |
713 | ||
6757edfe MM |
714 | /* Returns non-zero iff DECL is a specialization of TMPL. */ |
715 | ||
716 | int | |
717 | is_specialization_of (decl, tmpl) | |
718 | tree decl; | |
719 | tree tmpl; | |
720 | { | |
721 | tree t; | |
722 | ||
723 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
724 | { | |
725 | for (t = decl; | |
726 | t != NULL_TREE; | |
727 | t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE) | |
728 | if (t == tmpl) | |
729 | return 1; | |
730 | } | |
731 | else | |
732 | { | |
733 | my_friendly_assert (TREE_CODE (decl) == TYPE_DECL, 0); | |
734 | ||
735 | for (t = TREE_TYPE (decl); | |
736 | t != NULL_TREE; | |
737 | t = CLASSTYPE_USE_TEMPLATE (t) | |
738 | ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE) | |
3bfdc719 MM |
739 | if (same_type_p (TYPE_MAIN_VARIANT (t), |
740 | TYPE_MAIN_VARIANT (TREE_TYPE (tmpl)))) | |
6757edfe MM |
741 | return 1; |
742 | } | |
386b8a85 | 743 | |
6757edfe MM |
744 | return 0; |
745 | } | |
75650646 MM |
746 | |
747 | /* Register the specialization SPEC as a specialization of TMPL with | |
36a117a5 MM |
748 | the indicated ARGS. Returns SPEC, or an equivalent prior |
749 | declaration, if available. */ | |
75650646 | 750 | |
36a117a5 | 751 | static tree |
75650646 MM |
752 | register_specialization (spec, tmpl, args) |
753 | tree spec; | |
754 | tree tmpl; | |
755 | tree args; | |
756 | { | |
757 | tree s; | |
758 | ||
759 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0); | |
760 | ||
36a117a5 MM |
761 | if (TREE_CODE (spec) == FUNCTION_DECL |
762 | && uses_template_parms (DECL_TI_ARGS (spec))) | |
763 | /* This is the FUNCTION_DECL for a partial instantiation. Don't | |
764 | register it; we want the corresponding TEMPLATE_DECL instead. | |
765 | We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than | |
766 | the more obvious `uses_template_parms (spec)' to avoid problems | |
767 | with default function arguments. In particular, given | |
768 | something like this: | |
769 | ||
770 | template <class T> void f(T t1, T t = T()) | |
771 | ||
772 | the default argument expression is not substituted for in an | |
773 | instantiation unless and until it is actually needed. */ | |
774 | return spec; | |
75650646 | 775 | |
36a117a5 MM |
776 | /* There should be as many levels of arguments as there are |
777 | levels of parameters. */ | |
778 | my_friendly_assert (TMPL_ARGS_DEPTH (args) | |
779 | == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)), | |
780 | 0); | |
781 | ||
75650646 MM |
782 | for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); |
783 | s != NULL_TREE; | |
784 | s = TREE_CHAIN (s)) | |
785 | if (comp_template_args (TREE_PURPOSE (s), args)) | |
786 | { | |
787 | tree fn = TREE_VALUE (s); | |
788 | ||
789 | if (DECL_TEMPLATE_SPECIALIZATION (spec)) | |
790 | { | |
791 | if (DECL_TEMPLATE_INSTANTIATION (fn)) | |
792 | { | |
793 | if (TREE_USED (fn) | |
794 | || DECL_EXPLICIT_INSTANTIATION (fn)) | |
795 | { | |
8251199e | 796 | cp_error ("specialization of %D after instantiation", |
75650646 | 797 | fn); |
36a117a5 | 798 | return spec; |
75650646 MM |
799 | } |
800 | else | |
801 | { | |
802 | /* This situation should occur only if the first | |
803 | specialization is an implicit instantiation, | |
804 | the second is an explicit specialization, and | |
805 | the implicit instantiation has not yet been | |
806 | used. That situation can occur if we have | |
36a117a5 MM |
807 | implicitly instantiated a member function and |
808 | then specialized it later. | |
809 | ||
810 | We can also wind up here if a friend | |
811 | declaration that looked like an instantiation | |
812 | turns out to be a specialization: | |
813 | ||
814 | template <class T> void foo(T); | |
815 | class S { friend void foo<>(int) }; | |
816 | template <> void foo(int); | |
817 | ||
818 | We transform the existing DECL in place so that | |
819 | any pointers to it become pointers to the | |
fbf1c34b MM |
820 | updated declaration. |
821 | ||
822 | If there was a definition for the template, but | |
823 | not for the specialization, we want this to | |
824 | look as if there is no definition, and vice | |
825 | versa. */ | |
826 | DECL_INITIAL (fn) = NULL_TREE; | |
827 | duplicate_decls (spec, fn); | |
828 | ||
829 | return fn; | |
75650646 MM |
830 | } |
831 | } | |
832 | else if (DECL_TEMPLATE_SPECIALIZATION (fn)) | |
833 | { | |
fbf1c34b MM |
834 | duplicate_decls (spec, fn); |
835 | return fn; | |
75650646 MM |
836 | } |
837 | } | |
838 | } | |
839 | ||
840 | DECL_TEMPLATE_SPECIALIZATIONS (tmpl) | |
841 | = perm_tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl)); | |
36a117a5 MM |
842 | |
843 | return spec; | |
844 | } | |
845 | ||
846 | /* Unregister the specialization SPEC as a specialization of TMPL. | |
847 | Returns nonzero if the SPEC was listed as a specialization of | |
848 | TMPL. */ | |
849 | ||
850 | static int | |
851 | unregister_specialization (spec, tmpl) | |
852 | tree spec; | |
853 | tree tmpl; | |
854 | { | |
855 | tree* s; | |
856 | ||
857 | for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl); | |
858 | *s != NULL_TREE; | |
859 | s = &TREE_CHAIN (*s)) | |
860 | if (TREE_VALUE (*s) == spec) | |
861 | { | |
862 | *s = TREE_CHAIN (*s); | |
863 | return 1; | |
864 | } | |
865 | ||
866 | return 0; | |
75650646 MM |
867 | } |
868 | ||
e1467ff2 MM |
869 | /* Print the list of candidate FNS in an error message. */ |
870 | ||
104bf76a | 871 | void |
e1467ff2 MM |
872 | print_candidates (fns) |
873 | tree fns; | |
874 | { | |
875 | tree fn; | |
876 | ||
877 | char* str = "candidates are:"; | |
878 | ||
879 | for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn)) | |
880 | { | |
8251199e | 881 | cp_error_at ("%s %+#D", str, TREE_VALUE (fn)); |
e1467ff2 MM |
882 | str = " "; |
883 | } | |
884 | } | |
885 | ||
75650646 | 886 | /* Returns the template (one of the functions given by TEMPLATE_ID) |
e1467ff2 MM |
887 | which can be specialized to match the indicated DECL with the |
888 | explicit template args given in TEMPLATE_ID. If | |
889 | NEED_MEMBER_TEMPLATE is true the function is a specialization of a | |
890 | member template. The template args (those explicitly specified and | |
891 | those deduced) are output in a newly created vector *TARGS_OUT. If | |
892 | it is impossible to determine the result, an error message is | |
893 | issued, unless COMPLAIN is 0. The DECL may be NULL_TREE if none is | |
894 | available. */ | |
75650646 | 895 | |
386b8a85 | 896 | tree |
e1467ff2 | 897 | determine_specialization (template_id, decl, targs_out, |
75650646 MM |
898 | need_member_template, |
899 | complain) | |
386b8a85 | 900 | tree template_id; |
e1467ff2 | 901 | tree decl; |
386b8a85 JM |
902 | tree* targs_out; |
903 | int need_member_template; | |
904 | int complain; | |
905 | { | |
f2e48b67 | 906 | tree fns, targs_in; |
e1467ff2 | 907 | tree templates = NULL_TREE; |
386b8a85 | 908 | tree fn; |
386b8a85 | 909 | |
e1467ff2 MM |
910 | *targs_out = NULL_TREE; |
911 | ||
f2e48b67 BK |
912 | if (template_id == error_mark_node) |
913 | return error_mark_node; | |
914 | ||
915 | fns = TREE_OPERAND (template_id, 0); | |
916 | targs_in = TREE_OPERAND (template_id, 1); | |
917 | ||
27fafc8d JM |
918 | if (fns == error_mark_node) |
919 | return error_mark_node; | |
920 | ||
2c73f9f5 ML |
921 | /* Check for baselinks. */ |
922 | if (TREE_CODE (fns) == TREE_LIST) | |
923 | fns = TREE_VALUE (fns); | |
386b8a85 | 924 | |
2c73f9f5 | 925 | for (; fns; fns = OVL_NEXT (fns)) |
386b8a85 | 926 | { |
75650646 MM |
927 | tree tmpl; |
928 | ||
2c73f9f5 | 929 | fn = OVL_CURRENT (fns); |
75650646 MM |
930 | if (!need_member_template |
931 | && TREE_CODE (fn) == FUNCTION_DECL | |
e1467ff2 | 932 | && DECL_FUNCTION_MEMBER_P (fn) |
75650646 MM |
933 | && DECL_USE_TEMPLATE (fn) |
934 | && DECL_TI_TEMPLATE (fn)) | |
e1467ff2 MM |
935 | /* We can get here when processing something like: |
936 | template <class T> class X { void f(); } | |
937 | template <> void X<int>::f() {} | |
938 | We're specializing a member function, but not a member | |
939 | template. */ | |
75650646 MM |
940 | tmpl = DECL_TI_TEMPLATE (fn); |
941 | else if (TREE_CODE (fn) != TEMPLATE_DECL | |
e1467ff2 | 942 | || (need_member_template && !is_member_template (fn))) |
798eed5e | 943 | continue; |
75650646 MM |
944 | else |
945 | tmpl = fn; | |
386b8a85 | 946 | |
75650646 | 947 | if (list_length (targs_in) > DECL_NTPARMS (tmpl)) |
386b8a85 JM |
948 | continue; |
949 | ||
e1467ff2 | 950 | if (decl == NULL_TREE) |
386b8a85 | 951 | { |
34016c81 JM |
952 | /* Unify against ourselves to make sure that the args we have |
953 | make sense and there aren't any undeducible parms. It's OK if | |
954 | not all the parms are specified; they might be deduced | |
955 | later. */ | |
956 | tree targs = get_bindings_overload (tmpl, DECL_RESULT (tmpl), | |
957 | targs_in); | |
958 | ||
959 | if (targs) | |
e1467ff2 MM |
960 | /* Unification was successful. */ |
961 | templates = scratch_tree_cons (targs, tmpl, templates); | |
386b8a85 | 962 | } |
e1467ff2 MM |
963 | else |
964 | templates = scratch_tree_cons (NULL_TREE, tmpl, templates); | |
386b8a85 | 965 | } |
75650646 | 966 | |
e1467ff2 | 967 | if (decl != NULL_TREE) |
386b8a85 | 968 | { |
e1467ff2 | 969 | tree tmpl = most_specialized (templates, decl, targs_in); |
36a117a5 MM |
970 | tree inner_args; |
971 | tree tmpl_args; | |
e1467ff2 MM |
972 | |
973 | if (tmpl == error_mark_node) | |
974 | goto ambiguous; | |
975 | else if (tmpl == NULL_TREE) | |
976 | goto no_match; | |
977 | ||
36a117a5 MM |
978 | inner_args = get_bindings (tmpl, decl, targs_in); |
979 | tmpl_args = DECL_TI_ARGS (DECL_RESULT (tmpl)); | |
980 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (tmpl_args)) | |
981 | { | |
982 | *targs_out = copy_node (tmpl_args); | |
983 | SET_TMPL_ARGS_LEVEL (*targs_out, | |
984 | TMPL_ARGS_DEPTH (*targs_out), | |
985 | inner_args); | |
986 | } | |
987 | else | |
988 | *targs_out = inner_args; | |
989 | ||
e1467ff2 MM |
990 | return tmpl; |
991 | } | |
992 | ||
993 | if (templates == NULL_TREE) | |
994 | { | |
995 | no_match: | |
386b8a85 | 996 | if (complain) |
27fafc8d | 997 | { |
8251199e | 998 | cp_error_at ("template-id `%D' for `%+D' does not match any template declaration", |
27fafc8d JM |
999 | template_id, decl); |
1000 | return error_mark_node; | |
1001 | } | |
386b8a85 JM |
1002 | return NULL_TREE; |
1003 | } | |
34016c81 JM |
1004 | else if (TREE_CHAIN (templates) != NULL_TREE |
1005 | || uses_template_parms (TREE_PURPOSE (templates))) | |
386b8a85 | 1006 | { |
e1467ff2 | 1007 | ambiguous: |
386b8a85 JM |
1008 | if (complain) |
1009 | { | |
8251199e | 1010 | cp_error_at ("ambiguous template specialization `%D' for `%+D'", |
27fafc8d | 1011 | template_id, decl); |
e1467ff2 | 1012 | print_candidates (templates); |
27fafc8d | 1013 | return error_mark_node; |
386b8a85 | 1014 | } |
386b8a85 JM |
1015 | return NULL_TREE; |
1016 | } | |
1017 | ||
1018 | /* We have one, and exactly one, match. */ | |
e1467ff2 MM |
1019 | *targs_out = TREE_PURPOSE (templates); |
1020 | return TREE_VALUE (templates); | |
8d08fdba | 1021 | } |
6757edfe | 1022 | |
386b8a85 | 1023 | /* Check to see if the function just declared, as indicated in |
75650646 MM |
1024 | DECLARATOR, and in DECL, is a specialization of a function |
1025 | template. We may also discover that the declaration is an explicit | |
1026 | instantiation at this point. | |
1027 | ||
e1467ff2 MM |
1028 | Returns DECL, or an equivalent declaration that should be used |
1029 | instead. | |
75650646 | 1030 | |
75650646 MM |
1031 | FLAGS is a bitmask consisting of the following flags: |
1032 | ||
75650646 MM |
1033 | 2: The function has a definition. |
1034 | 4: The function is a friend. | |
75650646 MM |
1035 | |
1036 | The TEMPLATE_COUNT is the number of references to qualifying | |
1037 | template classes that appeared in the name of the function. For | |
1038 | example, in | |
1039 | ||
1040 | template <class T> struct S { void f(); }; | |
1041 | void S<int>::f(); | |
1042 | ||
1043 | the TEMPLATE_COUNT would be 1. However, explicitly specialized | |
1044 | classes are not counted in the TEMPLATE_COUNT, so that in | |
1045 | ||
1046 | template <class T> struct S {}; | |
1047 | template <> struct S<int> { void f(); } | |
36a117a5 | 1048 | template <> void S<int>::f(); |
75650646 MM |
1049 | |
1050 | the TEMPLATE_COUNT would be 0. (Note that this declaration is | |
1051 | illegal; there should be no template <>.) | |
1052 | ||
1053 | If the function is a specialization, it is marked as such via | |
1054 | DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO | |
1055 | is set up correctly, and it is added to the list of specializations | |
1056 | for that template. */ | |
386b8a85 | 1057 | |
e1467ff2 | 1058 | tree |
27bb8339 | 1059 | check_explicit_specialization (declarator, decl, template_count, flags) |
386b8a85 JM |
1060 | tree declarator; |
1061 | tree decl; | |
1062 | int template_count; | |
1063 | int flags; | |
1064 | { | |
75650646 MM |
1065 | int have_def = flags & 2; |
1066 | int is_friend = flags & 4; | |
1067 | int specialization = 0; | |
e1467ff2 | 1068 | int explicit_instantiation = 0; |
fd4de5ff | 1069 | int member_specialization = 0; |
75650646 MM |
1070 | |
1071 | tree ctype = DECL_CLASS_CONTEXT (decl); | |
1072 | tree dname = DECL_NAME (decl); | |
386b8a85 | 1073 | |
fd4de5ff | 1074 | if (processing_specialization) |
386b8a85 | 1075 | { |
fd4de5ff | 1076 | /* The last template header was of the form template <>. */ |
75650646 | 1077 | |
fd4de5ff MM |
1078 | if (template_header_count > template_count) |
1079 | { | |
1080 | /* There were more template headers than qualifying template | |
1081 | classes. */ | |
1082 | if (template_header_count - template_count > 1) | |
1083 | /* There shouldn't be that many template parameter | |
75650646 MM |
1084 | lists. There can be at most one parameter list for |
1085 | every qualifying class, plus one for the function | |
1086 | itself. */ | |
fd4de5ff | 1087 | cp_error ("too many template parameter lists in declaration of `%D'", decl); |
75650646 | 1088 | |
fd4de5ff MM |
1089 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); |
1090 | if (ctype) | |
1091 | member_specialization = 1; | |
1092 | else | |
1093 | specialization = 1; | |
75650646 | 1094 | } |
fd4de5ff | 1095 | else if (template_header_count == template_count) |
75650646 | 1096 | { |
fd4de5ff MM |
1097 | /* The counts are equal. So, this might be a |
1098 | specialization, but it is not a specialization of a | |
1099 | member template. It might be something like | |
1100 | ||
1101 | template <class T> struct S { | |
1102 | void f(int i); | |
1103 | }; | |
1104 | template <> | |
1105 | void S<int>::f(int i) {} */ | |
1106 | specialization = 1; | |
1107 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
75650646 | 1108 | } |
fd4de5ff | 1109 | else |
386b8a85 | 1110 | { |
fd4de5ff MM |
1111 | /* This cannot be an explicit specialization. There are not |
1112 | enough headers for all of the qualifying classes. For | |
1113 | example, we might have: | |
1114 | ||
1115 | template <> | |
1116 | void S<int>::T<char>::f(); | |
75650646 | 1117 | |
fd4de5ff MM |
1118 | But, we're missing another template <>. */ |
1119 | cp_error("too few template parameter lists in declaration of `%D'", decl); | |
1120 | return decl; | |
1121 | } | |
1122 | } | |
1123 | else if (processing_explicit_instantiation) | |
1124 | { | |
1125 | if (template_header_count) | |
1126 | cp_error ("template parameter list used in explicit instantiation"); | |
1127 | ||
1128 | if (have_def) | |
1129 | cp_error ("definition provided for explicit instantiation"); | |
75650646 | 1130 | |
fd4de5ff MM |
1131 | explicit_instantiation = 1; |
1132 | } | |
1133 | else if (ctype != NULL_TREE | |
1134 | && !TYPE_BEING_DEFINED (ctype) | |
1135 | && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype) | |
1136 | && !is_friend) | |
1137 | { | |
1138 | /* This case catches outdated code that looks like this: | |
1139 | ||
1140 | template <class T> struct S { void f(); }; | |
1141 | void S<int>::f() {} // Missing template <> | |
1142 | ||
1143 | We disable this check when the type is being defined to | |
1144 | avoid complaining about default compiler-generated | |
1145 | constructors, destructors, and assignment operators. | |
1146 | Since the type is an instantiation, not a specialization, | |
1147 | these are the only functions that can be defined before | |
1148 | the class is complete. */ | |
75650646 | 1149 | |
c6f2ed0d JM |
1150 | /* If they said |
1151 | template <class T> void S<int>::f() {} | |
1152 | that's bogus. */ | |
fd4de5ff MM |
1153 | if (template_header_count) |
1154 | { | |
1155 | cp_error ("template parameters specified in specialization"); | |
1156 | return decl; | |
c6f2ed0d | 1157 | } |
fd4de5ff MM |
1158 | |
1159 | if (pedantic) | |
1160 | cp_pedwarn | |
1161 | ("explicit specialization not preceded by `template <>'"); | |
1162 | specialization = 1; | |
1163 | SET_DECL_TEMPLATE_SPECIALIZATION (decl); | |
1164 | } | |
1165 | else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
1166 | { | |
1167 | if (is_friend) | |
1168 | /* This could be something like: | |
1169 | ||
1170 | template <class T> void f(T); | |
1171 | class S { friend void f<>(int); } */ | |
1172 | specialization = 1; | |
1173 | else | |
c6f2ed0d | 1174 | { |
fd4de5ff MM |
1175 | /* This case handles bogus declarations like template <> |
1176 | template <class T> void f<int>(); */ | |
75650646 | 1177 | |
fd4de5ff MM |
1178 | cp_error ("template-id `%D' in declaration of primary template", |
1179 | declarator); | |
1180 | return decl; | |
386b8a85 | 1181 | } |
75650646 | 1182 | } |
386b8a85 | 1183 | |
670960ac JM |
1184 | if (specialization || member_specialization) |
1185 | { | |
1186 | tree t = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
1187 | for (; t; t = TREE_CHAIN (t)) | |
1188 | if (TREE_PURPOSE (t)) | |
1189 | { | |
8251199e JM |
1190 | cp_pedwarn |
1191 | ("default argument specified in explicit specialization"); | |
670960ac JM |
1192 | break; |
1193 | } | |
f3400fe2 JM |
1194 | if (current_lang_name == lang_name_c) |
1195 | cp_error ("template specialization with C linkage"); | |
670960ac JM |
1196 | } |
1197 | ||
e1467ff2 | 1198 | if (specialization || member_specialization || explicit_instantiation) |
75650646 | 1199 | { |
36a117a5 | 1200 | tree gen_tmpl; |
75650646 MM |
1201 | tree tmpl = NULL_TREE; |
1202 | tree targs = NULL_TREE; | |
75650646 MM |
1203 | |
1204 | /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */ | |
386b8a85 JM |
1205 | if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR) |
1206 | { | |
1207 | tree fns; | |
1208 | ||
1209 | my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, | |
1210 | 0); | |
1211 | if (!ctype) | |
30394414 | 1212 | fns = IDENTIFIER_NAMESPACE_VALUE (dname); |
386b8a85 JM |
1213 | else |
1214 | fns = dname; | |
1215 | ||
75650646 MM |
1216 | declarator = |
1217 | lookup_template_function (fns, NULL_TREE); | |
386b8a85 JM |
1218 | } |
1219 | ||
f2e48b67 BK |
1220 | if (declarator == error_mark_node) |
1221 | return error_mark_node; | |
1222 | ||
1223 | if (TREE_CODE (TREE_OPERAND (declarator, 0)) == LOOKUP_EXPR) | |
386b8a85 JM |
1224 | { |
1225 | /* A friend declaration. We can't do much, because we don't | |
1226 | know what this resolves to, yet. */ | |
1227 | my_friendly_assert (is_friend != 0, 0); | |
e1467ff2 | 1228 | my_friendly_assert (!explicit_instantiation, 0); |
386b8a85 | 1229 | SET_DECL_IMPLICIT_INSTANTIATION (decl); |
e1467ff2 | 1230 | return decl; |
386b8a85 JM |
1231 | } |
1232 | ||
75650646 MM |
1233 | if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype)) |
1234 | { | |
8ec2ac34 | 1235 | if (!explicit_instantiation) |
6c30752f MM |
1236 | /* A specialization in class scope. This is illegal, |
1237 | but the error will already have been flagged by | |
1238 | check_specialization_scope. */ | |
1239 | return error_mark_node; | |
8ec2ac34 | 1240 | else |
b370501f KG |
1241 | { |
1242 | /* It's not legal to write an explicit instantiation in | |
1243 | class scope, e.g.: | |
8ec2ac34 | 1244 | |
b370501f | 1245 | class C { template void f(); } |
8ec2ac34 | 1246 | |
b370501f KG |
1247 | This case is caught by the parser. However, on |
1248 | something like: | |
8ec2ac34 | 1249 | |
b370501f | 1250 | template class C { void f(); }; |
8ec2ac34 | 1251 | |
b370501f KG |
1252 | (which is illegal) we can get here. The error will be |
1253 | issued later. */ | |
1254 | ; | |
1255 | } | |
8ec2ac34 | 1256 | |
e1467ff2 | 1257 | return decl; |
75650646 MM |
1258 | } |
1259 | else if (ctype != NULL_TREE | |
1260 | && (TREE_CODE (TREE_OPERAND (declarator, 0)) == | |
1261 | IDENTIFIER_NODE)) | |
386b8a85 | 1262 | { |
75650646 MM |
1263 | /* Find the list of functions in ctype that have the same |
1264 | name as the declared function. */ | |
1265 | tree name = TREE_OPERAND (declarator, 0); | |
386b8a85 | 1266 | tree fns; |
75650646 MM |
1267 | |
1268 | if (name == constructor_name (ctype) | |
1269 | || name == constructor_name_full (ctype)) | |
386b8a85 | 1270 | { |
75650646 MM |
1271 | int is_constructor = DECL_CONSTRUCTOR_P (decl); |
1272 | ||
1273 | if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype) | |
1274 | : !TYPE_HAS_DESTRUCTOR (ctype)) | |
1275 | { | |
1276 | /* From [temp.expl.spec]: | |
e1467ff2 | 1277 | |
75650646 MM |
1278 | If such an explicit specialization for the member |
1279 | of a class template names an implicitly-declared | |
1280 | special member function (clause _special_), the | |
e1467ff2 MM |
1281 | program is ill-formed. |
1282 | ||
1283 | Similar language is found in [temp.explicit]. */ | |
8251199e | 1284 | cp_error ("specialization of implicitly-declared special member function"); |
75650646 | 1285 | |
e1467ff2 | 1286 | return decl; |
75650646 | 1287 | } |
386b8a85 | 1288 | |
42da2fd8 | 1289 | name = is_constructor ? ctor_identifier : dtor_identifier; |
75650646 | 1290 | } |
42da2fd8 MM |
1291 | |
1292 | fns = lookup_fnfields (TYPE_BINFO (ctype), name, 1); | |
386b8a85 JM |
1293 | |
1294 | if (fns == NULL_TREE) | |
1295 | { | |
8251199e | 1296 | cp_error ("no member function `%s' declared in `%T'", |
75650646 | 1297 | IDENTIFIER_POINTER (name), |
386b8a85 | 1298 | ctype); |
e1467ff2 | 1299 | return decl; |
386b8a85 JM |
1300 | } |
1301 | else | |
1302 | TREE_OPERAND (declarator, 0) = fns; | |
1303 | } | |
75650646 | 1304 | |
e1467ff2 MM |
1305 | /* Figure out what exactly is being specialized at this point. |
1306 | Note that for an explicit instantiation, even one for a | |
38e01259 | 1307 | member function, we cannot tell apriori whether the |
e1467ff2 | 1308 | instantiation is for a member template, or just a member |
36a117a5 MM |
1309 | function of a template class. Even if a member template is |
1310 | being instantiated, the member template arguments may be | |
1311 | elided if they can be deduced from the rest of the | |
1312 | declaration. */ | |
e1467ff2 MM |
1313 | tmpl = determine_specialization (declarator, decl, |
1314 | &targs, | |
75650646 MM |
1315 | member_specialization, |
1316 | 1); | |
386b8a85 | 1317 | |
82a7448c | 1318 | if (tmpl && tmpl != error_mark_node) |
386b8a85 | 1319 | { |
36a117a5 MM |
1320 | gen_tmpl = most_general_template (tmpl); |
1321 | ||
e1467ff2 MM |
1322 | if (explicit_instantiation) |
1323 | { | |
03d0f4af MM |
1324 | /* We don't set DECL_EXPLICIT_INSTANTIATION here; that |
1325 | is done by do_decl_instantiation later. */ | |
36a117a5 | 1326 | decl = instantiate_template (tmpl, innermost_args (targs)); |
e1467ff2 MM |
1327 | return decl; |
1328 | } | |
36a117a5 MM |
1329 | |
1330 | /* If we though that the DECL was a member function, but it | |
1331 | turns out to be specializing a static member function, | |
1332 | make DECL a static member function as well. */ | |
1333 | if (DECL_STATIC_FUNCTION_P (tmpl) | |
1334 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
366c0f1e MM |
1335 | { |
1336 | revert_static_member_fn (&decl, 0, 0); | |
1337 | last_function_parms = TREE_CHAIN (last_function_parms); | |
1338 | } | |
e1467ff2 | 1339 | |
36a117a5 MM |
1340 | /* Set up the DECL_TEMPLATE_INFO for DECL. */ |
1341 | DECL_TEMPLATE_INFO (decl) | |
1342 | = perm_tree_cons (tmpl, targs, NULL_TREE); | |
1343 | ||
e1467ff2 MM |
1344 | /* Mangle the function name appropriately. Note that we do |
1345 | not mangle specializations of non-template member | |
1346 | functions of template classes, e.g. with | |
36a117a5 | 1347 | |
e1467ff2 | 1348 | template <class T> struct S { void f(); } |
36a117a5 | 1349 | |
e1467ff2 | 1350 | and given the specialization |
36a117a5 | 1351 | |
e1467ff2 | 1352 | template <> void S<int>::f() {} |
36a117a5 | 1353 | |
e1467ff2 MM |
1354 | we do not mangle S<int>::f() here. That's because it's |
1355 | just an ordinary member function and doesn't need special | |
36a117a5 MM |
1356 | treatment. We do this here so that the ordinary, |
1357 | non-template, name-mangling algorith will not be used | |
1358 | later. */ | |
e1467ff2 | 1359 | if ((is_member_template (tmpl) || ctype == NULL_TREE) |
75650646 | 1360 | && name_mangling_version >= 1) |
36a117a5 | 1361 | set_mangled_name_for_template_decl (decl); |
386b8a85 JM |
1362 | |
1363 | if (is_friend && !have_def) | |
36a117a5 MM |
1364 | /* This is not really a declaration of a specialization. |
1365 | It's just the name of an instantiation. But, it's not | |
1366 | a request for an instantiation, either. */ | |
fbf1c34b | 1367 | SET_DECL_IMPLICIT_INSTANTIATION (decl); |
75650646 | 1368 | |
36a117a5 MM |
1369 | /* Register this specialization so that we can find it |
1370 | again. */ | |
1371 | decl = register_specialization (decl, gen_tmpl, targs); | |
75650646 | 1372 | |
e1467ff2 | 1373 | return decl; |
386b8a85 JM |
1374 | } |
1375 | } | |
75650646 | 1376 | |
e1467ff2 | 1377 | return decl; |
386b8a85 | 1378 | } |
75650646 | 1379 | |
39c01e4c MM |
1380 | /* TYPE is being declared. Verify that the use of template headers |
1381 | and such is reasonable. Issue error messages if not. */ | |
1382 | ||
1383 | void | |
1384 | maybe_check_template_type (type) | |
1385 | tree type; | |
1386 | { | |
1387 | if (template_header_count) | |
1388 | { | |
1389 | /* We are in the scope of some `template <...>' header. */ | |
1390 | ||
1391 | int context_depth | |
1392 | = template_class_depth_real (TYPE_CONTEXT (type), | |
1393 | /*count_specializations=*/1); | |
1394 | ||
1395 | if (template_header_count <= context_depth) | |
1396 | /* This is OK; the template headers are for the context. We | |
1397 | are actually too lenient here; like | |
1398 | check_explicit_specialization we should consider the number | |
1399 | of template types included in the actual declaration. For | |
1400 | example, | |
1401 | ||
1402 | template <class T> struct S { | |
1403 | template <class U> template <class V> | |
1404 | struct I {}; | |
1405 | }; | |
1406 | ||
1407 | is illegal, but: | |
1408 | ||
1409 | template <class T> struct S { | |
1410 | template <class U> struct I; | |
1411 | }; | |
1412 | ||
1413 | template <class T> template <class U. | |
1414 | struct S<T>::I {}; | |
1415 | ||
1416 | is not. */ | |
1417 | ; | |
1418 | else if (template_header_count > context_depth + 1) | |
1419 | /* There are two many template parameter lists. */ | |
8251199e | 1420 | cp_error ("too many template parameter lists in declaration of `%T'", type); |
39c01e4c MM |
1421 | } |
1422 | } | |
1423 | ||
75650646 MM |
1424 | /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template |
1425 | parameters. These are represented in the same format used for | |
1426 | DECL_TEMPLATE_PARMS. */ | |
1427 | ||
1428 | int comp_template_parms (parms1, parms2) | |
1429 | tree parms1; | |
1430 | tree parms2; | |
1431 | { | |
1432 | tree p1; | |
1433 | tree p2; | |
1434 | ||
1435 | if (parms1 == parms2) | |
1436 | return 1; | |
1437 | ||
1438 | for (p1 = parms1, p2 = parms2; | |
1439 | p1 != NULL_TREE && p2 != NULL_TREE; | |
1440 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2)) | |
1441 | { | |
1442 | tree t1 = TREE_VALUE (p1); | |
1443 | tree t2 = TREE_VALUE (p2); | |
1444 | int i; | |
1445 | ||
1446 | my_friendly_assert (TREE_CODE (t1) == TREE_VEC, 0); | |
1447 | my_friendly_assert (TREE_CODE (t2) == TREE_VEC, 0); | |
1448 | ||
1449 | if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2)) | |
1450 | return 0; | |
1451 | ||
1452 | for (i = 0; i < TREE_VEC_LENGTH (t2); ++i) | |
1453 | { | |
1454 | tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i)); | |
1455 | tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i)); | |
1456 | ||
1457 | if (TREE_CODE (parm1) != TREE_CODE (parm2)) | |
1458 | return 0; | |
1459 | ||
1460 | if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM) | |
1461 | continue; | |
3bfdc719 | 1462 | else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2))) |
75650646 MM |
1463 | return 0; |
1464 | } | |
1465 | } | |
1466 | ||
1467 | if ((p1 != NULL_TREE) != (p2 != NULL_TREE)) | |
1468 | /* One set of parameters has more parameters lists than the | |
1469 | other. */ | |
1470 | return 0; | |
1471 | ||
1472 | return 1; | |
1473 | } | |
1474 | ||
f3400fe2 JM |
1475 | /* Complain if DECL shadows a template parameter. |
1476 | ||
1477 | [temp.local]: A template-parameter shall not be redeclared within its | |
1478 | scope (including nested scopes). */ | |
1479 | ||
1480 | void | |
1481 | check_template_shadow (decl) | |
1482 | tree decl; | |
1483 | { | |
f181d4ae | 1484 | tree olddecl = IDENTIFIER_VALUE (DECL_NAME (decl)); |
f3400fe2 | 1485 | |
f181d4ae MM |
1486 | if (current_template_parms && olddecl) |
1487 | { | |
f3400fe2 JM |
1488 | /* We check for decl != olddecl to avoid bogus errors for using a |
1489 | name inside a class. We check TPFI to avoid duplicate errors for | |
1490 | inline member templates. */ | |
fc03edb3 | 1491 | if (decl != olddecl && DECL_TEMPLATE_PARM_P (olddecl) |
f3400fe2 JM |
1492 | && ! TEMPLATE_PARMS_FOR_INLINE (current_template_parms)) |
1493 | { | |
1494 | cp_error_at ("declaration of `%#D'", decl); | |
1495 | cp_error_at (" shadows template parm `%#D'", olddecl); | |
1496 | } | |
1497 | } | |
1498 | } | |
22a7be53 | 1499 | |
f3400fe2 | 1500 | /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL, |
f84b4be9 JM |
1501 | ORIG_LEVEL, DECL, and TYPE. */ |
1502 | ||
1503 | static tree | |
1504 | build_template_parm_index (index, level, orig_level, decl, type) | |
1505 | int index; | |
1506 | int level; | |
1507 | int orig_level; | |
1508 | tree decl; | |
1509 | tree type; | |
1510 | { | |
1511 | tree t = make_node (TEMPLATE_PARM_INDEX); | |
1512 | TEMPLATE_PARM_IDX (t) = index; | |
1513 | TEMPLATE_PARM_LEVEL (t) = level; | |
1514 | TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level; | |
1515 | TEMPLATE_PARM_DECL (t) = decl; | |
1516 | TREE_TYPE (t) = type; | |
1517 | ||
1518 | return t; | |
1519 | } | |
1520 | ||
f84b4be9 | 1521 | /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose |
93cdc044 | 1522 | TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a |
f84b4be9 JM |
1523 | TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a |
1524 | new one is created. */ | |
1525 | ||
1526 | static tree | |
93cdc044 | 1527 | reduce_template_parm_level (index, type, levels) |
f84b4be9 JM |
1528 | tree index; |
1529 | tree type; | |
93cdc044 | 1530 | int levels; |
f84b4be9 JM |
1531 | { |
1532 | if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE | |
1533 | || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index)) | |
93cdc044 | 1534 | != TEMPLATE_PARM_LEVEL (index) - levels)) |
f84b4be9 JM |
1535 | { |
1536 | tree decl | |
1537 | = build_decl (TREE_CODE (TEMPLATE_PARM_DECL (index)), | |
1538 | DECL_NAME (TEMPLATE_PARM_DECL (index)), | |
1539 | type); | |
1540 | tree t | |
1541 | = build_template_parm_index (TEMPLATE_PARM_IDX (index), | |
93cdc044 | 1542 | TEMPLATE_PARM_LEVEL (index) - levels, |
f84b4be9 JM |
1543 | TEMPLATE_PARM_ORIG_LEVEL (index), |
1544 | decl, type); | |
1545 | TEMPLATE_PARM_DESCENDANTS (index) = t; | |
cae40af6 JM |
1546 | |
1547 | /* Template template parameters need this. */ | |
1548 | DECL_TEMPLATE_PARMS (decl) | |
1549 | = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index)); | |
f84b4be9 JM |
1550 | } |
1551 | ||
1552 | return TEMPLATE_PARM_DESCENDANTS (index); | |
1553 | } | |
1554 | ||
8d08fdba | 1555 | /* Process information from new template parameter NEXT and append it to the |
5566b478 | 1556 | LIST being built. */ |
e92cc029 | 1557 | |
8d08fdba MS |
1558 | tree |
1559 | process_template_parm (list, next) | |
1560 | tree list, next; | |
1561 | { | |
1562 | tree parm; | |
1563 | tree decl = 0; | |
a292b002 | 1564 | tree defval; |
5566b478 | 1565 | int is_type, idx; |
f84b4be9 | 1566 | |
8d08fdba MS |
1567 | parm = next; |
1568 | my_friendly_assert (TREE_CODE (parm) == TREE_LIST, 259); | |
a292b002 MS |
1569 | defval = TREE_PURPOSE (parm); |
1570 | parm = TREE_VALUE (parm); | |
1571 | is_type = TREE_PURPOSE (parm) == class_type_node; | |
5566b478 MS |
1572 | |
1573 | if (list) | |
1574 | { | |
1575 | tree p = TREE_VALUE (tree_last (list)); | |
1576 | ||
1577 | if (TREE_CODE (p) == TYPE_DECL) | |
1578 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p)); | |
73b0fce8 KL |
1579 | else if (TREE_CODE (p) == TEMPLATE_DECL) |
1580 | idx = TEMPLATE_TYPE_IDX (TREE_TYPE (DECL_TEMPLATE_RESULT (p))); | |
5566b478 | 1581 | else |
f84b4be9 | 1582 | idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p)); |
5566b478 MS |
1583 | ++idx; |
1584 | } | |
1585 | else | |
1586 | idx = 0; | |
1587 | ||
8d08fdba MS |
1588 | if (!is_type) |
1589 | { | |
a292b002 | 1590 | my_friendly_assert (TREE_CODE (TREE_PURPOSE (parm)) == TREE_LIST, 260); |
8d08fdba | 1591 | /* is a const-param */ |
a292b002 | 1592 | parm = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), |
c11b6f21 | 1593 | PARM, 0, NULL_TREE); |
8d08fdba MS |
1594 | /* A template parameter is not modifiable. */ |
1595 | TREE_READONLY (parm) = 1; | |
c91a56d2 | 1596 | if (IS_AGGR_TYPE (TREE_TYPE (parm)) |
410c2fba KL |
1597 | && TREE_CODE (TREE_TYPE (parm)) != TEMPLATE_TYPE_PARM |
1598 | && TREE_CODE (TREE_TYPE (parm)) != TYPENAME_TYPE) | |
8d08fdba | 1599 | { |
8251199e | 1600 | cp_error ("`%#T' is not a valid type for a template constant parameter", |
c91a56d2 MS |
1601 | TREE_TYPE (parm)); |
1602 | if (DECL_NAME (parm) == NULL_TREE) | |
8251199e | 1603 | error (" a template type parameter must begin with `class' or `typename'"); |
8d08fdba MS |
1604 | TREE_TYPE (parm) = void_type_node; |
1605 | } | |
37c46b43 MS |
1606 | else if (pedantic |
1607 | && (TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE | |
1608 | || TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE)) | |
8251199e | 1609 | cp_pedwarn ("`%T' is not a valid type for a template constant parameter", |
eb66be0e | 1610 | TREE_TYPE (parm)); |
8d08fdba MS |
1611 | if (TREE_PERMANENT (parm) == 0) |
1612 | { | |
1613 | parm = copy_node (parm); | |
1614 | TREE_PERMANENT (parm) = 1; | |
1615 | } | |
8d08fdba | 1616 | decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm)); |
f84b4be9 JM |
1617 | DECL_INITIAL (parm) = DECL_INITIAL (decl) |
1618 | = build_template_parm_index (idx, processing_template_decl, | |
1619 | processing_template_decl, | |
1620 | decl, TREE_TYPE (parm)); | |
8d08fdba MS |
1621 | } |
1622 | else | |
1623 | { | |
73b0fce8 KL |
1624 | tree t; |
1625 | parm = TREE_VALUE (parm); | |
1626 | ||
1627 | if (parm && TREE_CODE (parm) == TEMPLATE_DECL) | |
1628 | { | |
1629 | t = make_lang_type (TEMPLATE_TEMPLATE_PARM); | |
1630 | /* This is for distinguishing between real templates and template | |
1631 | template parameters */ | |
1632 | TREE_TYPE (parm) = t; | |
1633 | TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t; | |
1634 | decl = parm; | |
1635 | } | |
1636 | else | |
1637 | { | |
1638 | t = make_lang_type (TEMPLATE_TYPE_PARM); | |
1639 | /* parm is either IDENTIFIER_NODE or NULL_TREE */ | |
1640 | decl = build_decl (TYPE_DECL, parm, t); | |
1641 | } | |
1642 | ||
d2e5ee5c MS |
1643 | TYPE_NAME (t) = decl; |
1644 | TYPE_STUB_DECL (t) = decl; | |
a292b002 | 1645 | parm = decl; |
f84b4be9 JM |
1646 | TEMPLATE_TYPE_PARM_INDEX (t) |
1647 | = build_template_parm_index (idx, processing_template_decl, | |
1648 | processing_template_decl, | |
1649 | decl, TREE_TYPE (parm)); | |
8d08fdba | 1650 | } |
8ccc31eb | 1651 | SET_DECL_ARTIFICIAL (decl); |
fc03edb3 | 1652 | DECL_TEMPLATE_PARM_P (decl) = 1; |
8d08fdba | 1653 | pushdecl (decl); |
a292b002 | 1654 | parm = build_tree_list (defval, parm); |
8d08fdba MS |
1655 | return chainon (list, parm); |
1656 | } | |
1657 | ||
1658 | /* The end of a template parameter list has been reached. Process the | |
1659 | tree list into a parameter vector, converting each parameter into a more | |
1660 | useful form. Type parameters are saved as IDENTIFIER_NODEs, and others | |
1661 | as PARM_DECLs. */ | |
1662 | ||
1663 | tree | |
1664 | end_template_parm_list (parms) | |
1665 | tree parms; | |
1666 | { | |
5566b478 | 1667 | int nparms; |
8d08fdba | 1668 | tree parm; |
5566b478 MS |
1669 | tree saved_parmlist = make_tree_vec (list_length (parms)); |
1670 | ||
5566b478 MS |
1671 | current_template_parms |
1672 | = tree_cons (build_int_2 (0, processing_template_decl), | |
1673 | saved_parmlist, current_template_parms); | |
8d08fdba MS |
1674 | |
1675 | for (parm = parms, nparms = 0; parm; parm = TREE_CHAIN (parm), nparms++) | |
5566b478 | 1676 | TREE_VEC_ELT (saved_parmlist, nparms) = parm; |
a292b002 | 1677 | |
67ffc812 MM |
1678 | --processing_template_parmlist; |
1679 | ||
8d08fdba MS |
1680 | return saved_parmlist; |
1681 | } | |
1682 | ||
5566b478 MS |
1683 | /* end_template_decl is called after a template declaration is seen. */ |
1684 | ||
8d08fdba | 1685 | void |
5566b478 | 1686 | end_template_decl () |
8d08fdba | 1687 | { |
386b8a85 JM |
1688 | reset_specialization (); |
1689 | ||
5156628f | 1690 | if (! processing_template_decl) |
73aad9b9 JM |
1691 | return; |
1692 | ||
5566b478 MS |
1693 | /* This matches the pushlevel in begin_template_parm_list. */ |
1694 | poplevel (0, 0, 0); | |
8d08fdba | 1695 | |
5566b478 MS |
1696 | --processing_template_decl; |
1697 | current_template_parms = TREE_CHAIN (current_template_parms); | |
1698 | (void) get_pending_sizes (); /* Why? */ | |
1699 | } | |
8d08fdba | 1700 | |
36a117a5 MM |
1701 | /* Given a template argument vector containing the template PARMS. |
1702 | The innermost PARMS are given first. */ | |
9a3b49ac MS |
1703 | |
1704 | tree | |
1705 | current_template_args () | |
5566b478 | 1706 | { |
36a117a5 | 1707 | tree header; |
b370501f | 1708 | tree args = NULL_TREE; |
36a117a5 | 1709 | int length = TMPL_PARMS_DEPTH (current_template_parms); |
98c1c668 JM |
1710 | int l = length; |
1711 | ||
36a117a5 MM |
1712 | /* If there is only one level of template parameters, we do not |
1713 | create a TREE_VEC of TREE_VECs. Instead, we return a single | |
1714 | TREE_VEC containing the arguments. */ | |
1715 | if (length > 1) | |
1716 | args = make_tree_vec (length); | |
1717 | ||
1718 | for (header = current_template_parms; header; header = TREE_CHAIN (header)) | |
8d08fdba | 1719 | { |
5566b478 | 1720 | tree a = copy_node (TREE_VALUE (header)); |
36a117a5 MM |
1721 | int i; |
1722 | ||
5566b478 | 1723 | TREE_TYPE (a) = NULL_TREE; |
36a117a5 | 1724 | for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i) |
5566b478 | 1725 | { |
98c1c668 JM |
1726 | tree t = TREE_VEC_ELT (a, i); |
1727 | ||
36a117a5 | 1728 | /* T will be a list if we are called from within a |
98c1c668 JM |
1729 | begin/end_template_parm_list pair, but a vector directly |
1730 | if within a begin/end_member_template_processing pair. */ | |
1731 | if (TREE_CODE (t) == TREE_LIST) | |
1732 | { | |
1733 | t = TREE_VALUE (t); | |
1734 | ||
73b0fce8 KL |
1735 | if (TREE_CODE (t) == TYPE_DECL |
1736 | || TREE_CODE (t) == TEMPLATE_DECL) | |
98c1c668 JM |
1737 | t = TREE_TYPE (t); |
1738 | else | |
1739 | t = DECL_INITIAL (t); | |
36a117a5 | 1740 | TREE_VEC_ELT (a, i) = t; |
98c1c668 | 1741 | } |
5566b478 | 1742 | } |
36a117a5 MM |
1743 | |
1744 | if (length > 1) | |
1745 | TREE_VEC_ELT (args, --l) = a; | |
1746 | else | |
1747 | args = a; | |
8d08fdba MS |
1748 | } |
1749 | ||
9a3b49ac MS |
1750 | return args; |
1751 | } | |
75650646 | 1752 | |
e1467ff2 MM |
1753 | /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated |
1754 | template PARMS. Used by push_template_decl below. */ | |
1755 | ||
75650646 MM |
1756 | static tree |
1757 | build_template_decl (decl, parms) | |
1758 | tree decl; | |
1759 | tree parms; | |
1760 | { | |
1761 | tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE); | |
1762 | DECL_TEMPLATE_PARMS (tmpl) = parms; | |
1763 | DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl); | |
1764 | if (DECL_LANG_SPECIFIC (decl)) | |
1765 | { | |
1766 | DECL_CLASS_CONTEXT (tmpl) = DECL_CLASS_CONTEXT (decl); | |
1767 | DECL_STATIC_FUNCTION_P (tmpl) = | |
1768 | DECL_STATIC_FUNCTION_P (decl); | |
1769 | } | |
1770 | ||
1771 | return tmpl; | |
1772 | } | |
1773 | ||
050367a3 MM |
1774 | struct template_parm_data |
1775 | { | |
6c30752f MM |
1776 | /* The level of the template parameters we are currently |
1777 | processing. */ | |
050367a3 | 1778 | int level; |
6c30752f MM |
1779 | |
1780 | /* The index of the specialization argument we are currently | |
1781 | processing. */ | |
1782 | int current_arg; | |
1783 | ||
1784 | /* An array whose size is the number of template parameters. The | |
1785 | elements are non-zero if the parameter has been used in any one | |
1786 | of the arguments processed so far. */ | |
050367a3 | 1787 | int* parms; |
6c30752f MM |
1788 | |
1789 | /* An array whose size is the number of template arguments. The | |
1790 | elements are non-zero if the argument makes use of template | |
1791 | parameters of this level. */ | |
1792 | int* arg_uses_template_parms; | |
050367a3 MM |
1793 | }; |
1794 | ||
1795 | /* Subroutine of push_template_decl used to see if each template | |
1796 | parameter in a partial specialization is used in the explicit | |
1797 | argument list. If T is of the LEVEL given in DATA (which is | |
1798 | treated as a template_parm_data*), then DATA->PARMS is marked | |
1799 | appropriately. */ | |
1800 | ||
1801 | static int | |
1802 | mark_template_parm (t, data) | |
1803 | tree t; | |
1804 | void* data; | |
1805 | { | |
1806 | int level; | |
1807 | int idx; | |
1808 | struct template_parm_data* tpd = (struct template_parm_data*) data; | |
1809 | ||
1810 | if (TREE_CODE (t) == TEMPLATE_PARM_INDEX) | |
1811 | { | |
1812 | level = TEMPLATE_PARM_LEVEL (t); | |
1813 | idx = TEMPLATE_PARM_IDX (t); | |
1814 | } | |
1815 | else | |
1816 | { | |
1817 | level = TEMPLATE_TYPE_LEVEL (t); | |
1818 | idx = TEMPLATE_TYPE_IDX (t); | |
1819 | } | |
1820 | ||
1821 | if (level == tpd->level) | |
6c30752f MM |
1822 | { |
1823 | tpd->parms[idx] = 1; | |
1824 | tpd->arg_uses_template_parms[tpd->current_arg] = 1; | |
1825 | } | |
050367a3 MM |
1826 | |
1827 | /* Return zero so that for_each_template_parm will continue the | |
1828 | traversal of the tree; we want to mark *every* template parm. */ | |
1829 | return 0; | |
1830 | } | |
1831 | ||
6c30752f MM |
1832 | /* Process the partial specialization DECL. */ |
1833 | ||
1834 | tree | |
1835 | process_partial_specialization (decl) | |
1836 | tree decl; | |
1837 | { | |
1838 | tree type = TREE_TYPE (decl); | |
1839 | tree maintmpl = CLASSTYPE_TI_TEMPLATE (type); | |
1840 | tree specargs = CLASSTYPE_TI_ARGS (type); | |
1841 | tree inner_args = innermost_args (specargs); | |
1842 | tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms); | |
1843 | tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl); | |
1844 | int nargs = TREE_VEC_LENGTH (inner_args); | |
1845 | int ntparms = TREE_VEC_LENGTH (inner_parms); | |
1846 | int i; | |
1847 | int did_error_intro = 0; | |
6c30752f MM |
1848 | struct template_parm_data tpd; |
1849 | struct template_parm_data tpd2; | |
1850 | ||
6c30752f MM |
1851 | /* We check that each of the template parameters given in the |
1852 | partial specialization is used in the argument list to the | |
1853 | specialization. For example: | |
1854 | ||
1855 | template <class T> struct S; | |
1856 | template <class T> struct S<T*>; | |
1857 | ||
1858 | The second declaration is OK because `T*' uses the template | |
1859 | parameter T, whereas | |
1860 | ||
1861 | template <class T> struct S<int>; | |
1862 | ||
1863 | is no good. Even trickier is: | |
1864 | ||
1865 | template <class T> | |
1866 | struct S1 | |
1867 | { | |
1868 | template <class U> | |
1869 | struct S2; | |
1870 | template <class U> | |
1871 | struct S2<T>; | |
1872 | }; | |
1873 | ||
1874 | The S2<T> declaration is actually illegal; it is a | |
1875 | full-specialization. Of course, | |
1876 | ||
1877 | template <class U> | |
1878 | struct S2<T (*)(U)>; | |
1879 | ||
1880 | or some such would have been OK. */ | |
1881 | tpd.level = TMPL_PARMS_DEPTH (current_template_parms); | |
1882 | tpd.parms = alloca (sizeof (int) * ntparms); | |
1ddb2906 | 1883 | bzero ((PTR) tpd.parms, sizeof (int) * ntparms); |
6c30752f MM |
1884 | |
1885 | tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs); | |
1ddb2906 | 1886 | bzero ((PTR) tpd.arg_uses_template_parms, sizeof (int) * nargs); |
6c30752f MM |
1887 | for (i = 0; i < nargs; ++i) |
1888 | { | |
1889 | tpd.current_arg = i; | |
1890 | for_each_template_parm (TREE_VEC_ELT (inner_args, i), | |
1891 | &mark_template_parm, | |
1892 | &tpd); | |
1893 | } | |
1894 | for (i = 0; i < ntparms; ++i) | |
1895 | if (tpd.parms[i] == 0) | |
1896 | { | |
1897 | /* One of the template parms was not used in the | |
1898 | specialization. */ | |
1899 | if (!did_error_intro) | |
1900 | { | |
8251199e | 1901 | cp_error ("template parameters not used in partial specialization:"); |
6c30752f MM |
1902 | did_error_intro = 1; |
1903 | } | |
1904 | ||
8251199e | 1905 | cp_error (" `%D'", |
6c30752f MM |
1906 | TREE_VALUE (TREE_VEC_ELT (inner_parms, i))); |
1907 | } | |
1908 | ||
1909 | /* [temp.class.spec] | |
1910 | ||
1911 | The argument list of the specialization shall not be identical to | |
1912 | the implicit argument list of the primary template. */ | |
1913 | if (comp_template_args (inner_args, | |
1914 | innermost_args (CLASSTYPE_TI_ARGS (TREE_TYPE | |
1915 | (maintmpl))))) | |
8251199e | 1916 | cp_error ("partial specialization `%T' does not specialize any template arguments", type); |
6c30752f MM |
1917 | |
1918 | /* [temp.class.spec] | |
1919 | ||
1920 | A partially specialized non-type argument expression shall not | |
1921 | involve template parameters of the partial specialization except | |
1922 | when the argument expression is a simple identifier. | |
1923 | ||
1924 | The type of a template parameter corresponding to a specialized | |
1925 | non-type argument shall not be dependent on a parameter of the | |
1926 | specialization. */ | |
1927 | my_friendly_assert (nargs == DECL_NTPARMS (maintmpl), 0); | |
1928 | tpd2.parms = 0; | |
1929 | for (i = 0; i < nargs; ++i) | |
1930 | { | |
1931 | tree arg = TREE_VEC_ELT (inner_args, i); | |
1932 | if (/* These first two lines are the `non-type' bit. */ | |
1933 | TREE_CODE_CLASS (TREE_CODE (arg)) != 't' | |
1934 | && TREE_CODE (arg) != TEMPLATE_DECL | |
1935 | /* This next line is the `argument expression is not just a | |
1936 | simple identifier' condition and also the `specialized | |
1937 | non-type argument' bit. */ | |
1938 | && TREE_CODE (arg) != TEMPLATE_PARM_INDEX) | |
1939 | { | |
1940 | if (tpd.arg_uses_template_parms[i]) | |
8251199e | 1941 | cp_error ("template argument `%E' involves template parameter(s)", arg); |
6c30752f MM |
1942 | else |
1943 | { | |
1944 | /* Look at the corresponding template parameter, | |
1945 | marking which template parameters its type depends | |
1946 | upon. */ | |
1947 | tree type = | |
1948 | TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms, | |
1949 | i))); | |
1950 | ||
1951 | if (!tpd2.parms) | |
1952 | { | |
1953 | /* We haven't yet initialized TPD2. Do so now. */ | |
1954 | tpd2.arg_uses_template_parms | |
1955 | = (int*) alloca (sizeof (int) * nargs); | |
104bf76a | 1956 | /* The number of parameters here is the number in the |
76a83782 RH |
1957 | main template, which, as checked in the assertion |
1958 | above, is NARGS. */ | |
6c30752f MM |
1959 | tpd2.parms = (int*) alloca (sizeof (int) * nargs); |
1960 | tpd2.level = | |
1961 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl)); | |
1962 | } | |
1963 | ||
104bf76a | 1964 | /* Mark the template parameters. But this time, we're |
6c30752f MM |
1965 | looking for the template parameters of the main |
1966 | template, not in the specialization. */ | |
1967 | tpd2.current_arg = i; | |
1968 | tpd2.arg_uses_template_parms[i] = 0; | |
1ddb2906 | 1969 | bzero ((PTR) tpd2.parms, sizeof (int) * nargs); |
6c30752f MM |
1970 | for_each_template_parm (type, |
1971 | &mark_template_parm, | |
1972 | &tpd2); | |
1973 | ||
1974 | if (tpd2.arg_uses_template_parms [i]) | |
1975 | { | |
1976 | /* The type depended on some template parameters. | |
1977 | If they are fully specialized in the | |
1978 | specialization, that's OK. */ | |
1979 | int j; | |
1980 | for (j = 0; j < nargs; ++j) | |
1981 | if (tpd2.parms[j] != 0 | |
1982 | && tpd.arg_uses_template_parms [j]) | |
1983 | { | |
104bf76a | 1984 | cp_error ("type `%T' of template argument `%E' depends on template parameter(s)", |
6c30752f MM |
1985 | type, |
1986 | arg); | |
1987 | break; | |
1988 | } | |
1989 | } | |
1990 | } | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | if (retrieve_specialization (maintmpl, specargs)) | |
1995 | /* We've already got this specialization. */ | |
1996 | return decl; | |
1997 | ||
1998 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl) = CLASSTYPE_TI_SPEC_INFO (type) | |
1999 | = perm_tree_cons (inner_args, inner_parms, | |
2000 | DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)); | |
2001 | TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type; | |
2002 | return decl; | |
2003 | } | |
2004 | ||
6ba89f8e MM |
2005 | /* Check that a template declaration's use of default arguments is not |
2006 | invalid. Here, PARMS are the template parameters. IS_PRIMARY is | |
2007 | non-zero if DECL is the thing declared by a primary template. | |
2008 | IS_PARTIAL is non-zero if DECL is a partial specialization. */ | |
2009 | ||
2010 | static void | |
2011 | check_default_tmpl_args (decl, parms, is_primary, is_partial) | |
2012 | tree decl; | |
2013 | tree parms; | |
2014 | int is_primary; | |
2015 | int is_partial; | |
2016 | { | |
2017 | char* msg; | |
2018 | int last_level_to_check; | |
2019 | ||
2020 | /* [temp.param] | |
2021 | ||
2022 | A default template-argument shall not be specified in a | |
2023 | function template declaration or a function template definition, nor | |
2024 | in the template-parameter-list of the definition of a member of a | |
2025 | class template. */ | |
2026 | ||
2027 | if (current_class_type | |
2028 | && !TYPE_BEING_DEFINED (current_class_type) | |
2029 | && DECL_REAL_CONTEXT (decl) == current_class_type | |
2030 | && DECL_DEFINED_IN_CLASS_P (decl)) | |
2031 | /* We already checked these parameters when the template was | |
2032 | declared, so there's no need to do it again now. This is an | |
2033 | inline member function definition. */ | |
2034 | return; | |
2035 | ||
2036 | if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary) | |
2037 | /* For an ordinary class template, default template arguments are | |
2038 | allowed at the innermost level, e.g.: | |
2039 | template <class T = int> | |
2040 | struct S {}; | |
2041 | but, in a partial specialization, they're not allowed even | |
2042 | there, as we have in [temp.class.spec]: | |
2043 | ||
2044 | The template parameter list of a specialization shall not | |
2045 | contain default template argument values. | |
2046 | ||
2047 | So, for a partial specialization, or for a function template, | |
2048 | we look at all of them. */ | |
2049 | ; | |
2050 | else | |
2051 | /* But, for a primary class template that is not a partial | |
2052 | specialization we look at all template parameters except the | |
2053 | innermost ones. */ | |
2054 | parms = TREE_CHAIN (parms); | |
2055 | ||
2056 | /* Figure out what error message to issue. */ | |
2057 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
2058 | msg = "default argument for template parameter in function template `%D'"; | |
2059 | else if (is_partial) | |
2060 | msg = "default argument in partial specialization `%D'"; | |
2061 | else | |
2062 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2063 | ||
2064 | if (current_class_type && TYPE_BEING_DEFINED (current_class_type)) | |
2065 | /* If we're inside a class definition, there's no need to | |
104bf76a | 2066 | examine the parameters to the class itself. On the one |
6ba89f8e MM |
2067 | hand, they will be checked when the class is defined, and, |
2068 | on the other, default arguments are legal in things like: | |
2069 | template <class T = double> | |
2070 | struct S { template <class U> void f(U); }; | |
2071 | Here the default argument for `S' has no bearing on the | |
2072 | declaration of `f'. */ | |
2073 | last_level_to_check = template_class_depth (current_class_type) + 1; | |
2074 | else | |
2075 | /* Check everything. */ | |
2076 | last_level_to_check = 0; | |
2077 | ||
2078 | for (; parms && TMPL_PARMS_DEPTH (parms) >= last_level_to_check; | |
2079 | parms = TREE_CHAIN (parms)) | |
2080 | { | |
2081 | tree inner_parms = TREE_VALUE (parms); | |
2082 | int i, ntparms; | |
2083 | ||
2084 | ntparms = TREE_VEC_LENGTH (inner_parms); | |
2085 | for (i = 0; i < ntparms; ++i) | |
2086 | if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i))) | |
2087 | { | |
2088 | if (msg) | |
2089 | { | |
2090 | cp_error (msg, decl); | |
2091 | msg = 0; | |
2092 | } | |
2093 | ||
2094 | /* Clear out the default argument so that we are not | |
2095 | confused later. */ | |
2096 | TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE; | |
2097 | } | |
2098 | ||
2099 | /* At this point, if we're still interested in issuing messages, | |
2100 | they must apply to classes surrounding the object declared. */ | |
2101 | if (msg) | |
2102 | msg = "default argument for template parameter for class enclosing `%D'"; | |
2103 | } | |
2104 | } | |
2105 | ||
3ac3d9ea | 2106 | /* Creates a TEMPLATE_DECL for the indicated DECL using the template |
f84b4be9 JM |
2107 | parameters given by current_template_args, or reuses a |
2108 | previously existing one, if appropriate. Returns the DECL, or an | |
6757edfe MM |
2109 | equivalent one, if it is replaced via a call to duplicate_decls. |
2110 | ||
2111 | If IS_FRIEND is non-zero, DECL is a friend declaration. */ | |
3ac3d9ea MM |
2112 | |
2113 | tree | |
6757edfe | 2114 | push_template_decl_real (decl, is_friend) |
9a3b49ac | 2115 | tree decl; |
6757edfe | 2116 | int is_friend; |
9a3b49ac MS |
2117 | { |
2118 | tree tmpl; | |
f84b4be9 | 2119 | tree args; |
9a3b49ac | 2120 | tree info; |
f84b4be9 JM |
2121 | tree ctx; |
2122 | int primary; | |
6ba89f8e MM |
2123 | int is_partial; |
2124 | ||
2125 | /* See if this is a partial specialization. */ | |
2126 | is_partial = (TREE_CODE (decl) == TYPE_DECL && DECL_ARTIFICIAL (decl) | |
2127 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE | |
2128 | && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl))); | |
6757edfe MM |
2129 | |
2130 | is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl)); | |
f84b4be9 JM |
2131 | |
2132 | if (is_friend) | |
2133 | /* For a friend, we want the context of the friend function, not | |
2134 | the type of which it is a friend. */ | |
2135 | ctx = DECL_CONTEXT (decl); | |
2c73f9f5 ML |
2136 | else if (DECL_REAL_CONTEXT (decl) |
2137 | && TREE_CODE (DECL_REAL_CONTEXT (decl)) != NAMESPACE_DECL) | |
f84b4be9 JM |
2138 | /* In the case of a virtual function, we want the class in which |
2139 | it is defined. */ | |
2140 | ctx = DECL_REAL_CONTEXT (decl); | |
2141 | else | |
2142 | /* Otherwise, if we're currently definining some class, the DECL | |
2143 | is assumed to be a member of the class. */ | |
2144 | ctx = current_class_type; | |
2145 | ||
2c73f9f5 ML |
2146 | if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL) |
2147 | ctx = NULL_TREE; | |
2148 | ||
2149 | if (!DECL_CONTEXT (decl)) | |
cb0dbb9a | 2150 | DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace); |
2c73f9f5 | 2151 | |
93cdc044 JM |
2152 | /* For determining whether this is a primary template or not, we're really |
2153 | interested in the lexical context, not the true context. */ | |
2154 | if (is_friend) | |
36a117a5 | 2155 | info = current_class_type; |
93cdc044 JM |
2156 | else |
2157 | info = ctx; | |
2158 | ||
6ba89f8e | 2159 | /* See if this is a primary template. */ |
93cdc044 JM |
2160 | if (info && TREE_CODE (info) == FUNCTION_DECL) |
2161 | primary = 0; | |
6757edfe MM |
2162 | /* Note that template_class_depth returns 0 if given NULL_TREE, so |
2163 | this next line works even when we are at global scope. */ | |
2164 | else if (processing_template_decl > template_class_depth (info)) | |
9a3b49ac | 2165 | primary = 1; |
f84b4be9 JM |
2166 | else |
2167 | primary = 0; | |
9a3b49ac | 2168 | |
83566abf JM |
2169 | if (primary) |
2170 | { | |
2171 | if (current_lang_name == lang_name_c) | |
8251199e | 2172 | cp_error ("template with C linkage"); |
83566abf | 2173 | if (TREE_CODE (decl) == TYPE_DECL && ANON_AGGRNAME_P (DECL_NAME (decl))) |
8251199e | 2174 | cp_error ("template class without a name"); |
ed44da02 MM |
2175 | if (TREE_CODE (decl) == TYPE_DECL |
2176 | && TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
8251199e | 2177 | cp_error ("template declaration of `%#T'", TREE_TYPE (decl)); |
83566abf JM |
2178 | } |
2179 | ||
6ba89f8e MM |
2180 | /* Check to see that the rules regarding the use of default |
2181 | arguments are not being violated. */ | |
2182 | check_default_tmpl_args (decl, current_template_parms, | |
2183 | primary, is_partial); | |
73aad9b9 | 2184 | |
6ba89f8e MM |
2185 | if (is_partial) |
2186 | return process_partial_specialization (decl); | |
d32789d8 | 2187 | |
9a3b49ac MS |
2188 | args = current_template_args (); |
2189 | ||
f84b4be9 JM |
2190 | if (!ctx |
2191 | || TREE_CODE (ctx) == FUNCTION_DECL | |
2192 | || TYPE_BEING_DEFINED (ctx) | |
2193 | || (is_friend && !DECL_TEMPLATE_INFO (decl))) | |
8d08fdba | 2194 | { |
75650646 | 2195 | if (DECL_LANG_SPECIFIC (decl) |
f84b4be9 JM |
2196 | && DECL_TEMPLATE_INFO (decl) |
2197 | && DECL_TI_TEMPLATE (decl)) | |
2198 | tmpl = DECL_TI_TEMPLATE (decl); | |
2199 | else | |
786b5245 | 2200 | { |
f84b4be9 JM |
2201 | tmpl = build_template_decl (decl, current_template_parms); |
2202 | ||
2203 | if (DECL_LANG_SPECIFIC (decl) | |
2204 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
2205 | { | |
2206 | /* A specialization of a member template of a template | |
2207 | class. */ | |
2208 | SET_DECL_TEMPLATE_SPECIALIZATION (tmpl); | |
2209 | DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl); | |
2210 | DECL_TEMPLATE_INFO (decl) = NULL_TREE; | |
2211 | } | |
786b5245 | 2212 | } |
8d08fdba MS |
2213 | } |
2214 | else | |
2215 | { | |
e1a5ccf7 | 2216 | tree a, t, current, parms; |
ba4f4e5d | 2217 | int i; |
6633d636 | 2218 | |
73aad9b9 | 2219 | if (CLASSTYPE_TEMPLATE_INSTANTIATION (ctx)) |
8251199e | 2220 | cp_error ("must specialize `%#T' before defining member `%#D'", |
73aad9b9 | 2221 | ctx, decl); |
6b9ab5cc MM |
2222 | if (TREE_CODE (decl) == TYPE_DECL) |
2223 | { | |
ed44da02 MM |
2224 | if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl))) |
2225 | || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE) | |
2226 | && TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) | |
2227 | && TYPE_TI_TEMPLATE (TREE_TYPE (decl))) | |
2228 | tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl)); | |
6b9ab5cc MM |
2229 | else |
2230 | { | |
8251199e | 2231 | cp_error ("`%D' does not declare a template type", decl); |
6b9ab5cc MM |
2232 | return decl; |
2233 | } | |
2234 | } | |
fc378698 | 2235 | else if (! DECL_TEMPLATE_INFO (decl)) |
c91a56d2 | 2236 | { |
8251199e | 2237 | cp_error ("template definition of non-template `%#D'", decl); |
3ac3d9ea | 2238 | return decl; |
c91a56d2 | 2239 | } |
8d08fdba | 2240 | else |
5566b478 | 2241 | tmpl = DECL_TI_TEMPLATE (decl); |
98c1c668 | 2242 | |
e1a5ccf7 JM |
2243 | if (is_member_template (tmpl) |
2244 | && DECL_FUNCTION_TEMPLATE_P (tmpl) | |
2245 | && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl) | |
2246 | && DECL_TEMPLATE_SPECIALIZATION (decl)) | |
98c1c668 | 2247 | { |
e1a5ccf7 JM |
2248 | tree new_tmpl; |
2249 | ||
2250 | /* The declaration is a specialization of a member | |
2251 | template, declared outside the class. Therefore, the | |
2252 | innermost template arguments will be NULL, so we | |
2253 | replace them with the arguments determined by the | |
2254 | earlier call to check_explicit_specialization. */ | |
2255 | args = DECL_TI_ARGS (decl); | |
2256 | ||
2257 | new_tmpl | |
2258 | = build_template_decl (decl, current_template_parms); | |
2259 | DECL_TEMPLATE_RESULT (new_tmpl) = decl; | |
2260 | TREE_TYPE (new_tmpl) = TREE_TYPE (decl); | |
2261 | DECL_TI_TEMPLATE (decl) = new_tmpl; | |
2262 | SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl); | |
2263 | DECL_TEMPLATE_INFO (new_tmpl) = | |
2264 | perm_tree_cons (tmpl, args, NULL_TREE); | |
2265 | ||
2266 | register_specialization (new_tmpl, tmpl, args); | |
2267 | return decl; | |
98c1c668 | 2268 | } |
98c1c668 | 2269 | |
e1a5ccf7 | 2270 | /* Make sure the template headers we got make sense. */ |
6633d636 | 2271 | |
e1a5ccf7 JM |
2272 | parms = DECL_TEMPLATE_PARMS (tmpl); |
2273 | i = TMPL_PARMS_DEPTH (parms); | |
2274 | if (TMPL_ARGS_DEPTH (args) != i) | |
98c1c668 | 2275 | { |
e1a5ccf7 JM |
2276 | cp_error ("expected %d levels of template parms for `%#D', got %d", |
2277 | i, decl, TMPL_ARGS_DEPTH (args)); | |
98c1c668 | 2278 | } |
e1a5ccf7 JM |
2279 | else |
2280 | for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms)) | |
2281 | { | |
2282 | a = TMPL_ARGS_LEVEL (args, i); | |
2283 | t = INNERMOST_TEMPLATE_PARMS (parms); | |
2284 | ||
2285 | if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a)) | |
2286 | { | |
2287 | if (current == decl) | |
2288 | cp_error ("got %d template parameters for `%#D'", | |
2289 | TREE_VEC_LENGTH (a), decl); | |
2290 | else | |
2291 | cp_error ("got %d template parameters for `%#T'", | |
2292 | TREE_VEC_LENGTH (a), current); | |
2293 | cp_error (" but %d required", TREE_VEC_LENGTH (t)); | |
2294 | } | |
98c1c668 | 2295 | |
e1a5ccf7 JM |
2296 | /* Perhaps we should also check that the parms are used in the |
2297 | appropriate qualifying scopes in the declarator? */ | |
6633d636 | 2298 | |
e1a5ccf7 JM |
2299 | if (current == decl) |
2300 | current = ctx; | |
2301 | else | |
2302 | current = TYPE_CONTEXT (current); | |
2303 | } | |
5566b478 | 2304 | } |
8d08fdba | 2305 | |
5566b478 MS |
2306 | DECL_TEMPLATE_RESULT (tmpl) = decl; |
2307 | TREE_TYPE (tmpl) = TREE_TYPE (decl); | |
8d08fdba | 2308 | |
36a117a5 MM |
2309 | /* Push template declarations for global functions and types. Note |
2310 | that we do not try to push a global template friend declared in a | |
2311 | template class; such a thing may well depend on the template | |
39c01e4c | 2312 | parameters of the class. */ |
36a117a5 MM |
2313 | if (! ctx |
2314 | && !(is_friend && template_class_depth (current_class_type) > 0)) | |
2c73f9f5 | 2315 | tmpl = pushdecl_namespace_level (tmpl); |
8d08fdba | 2316 | |
5566b478 | 2317 | if (primary) |
6757edfe | 2318 | DECL_PRIMARY_TEMPLATE (tmpl) = tmpl; |
5566b478 MS |
2319 | |
2320 | info = perm_tree_cons (tmpl, args, NULL_TREE); | |
2321 | ||
824b9a4c | 2322 | if (TREE_CODE (decl) == TYPE_DECL && DECL_ARTIFICIAL (decl)) |
8d08fdba | 2323 | { |
ed44da02 MM |
2324 | SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info); |
2325 | if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL) | |
2326 | && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE) | |
75650646 | 2327 | DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl)); |
51c184be | 2328 | } |
ec255269 | 2329 | else if (! DECL_LANG_SPECIFIC (decl)) |
8251199e | 2330 | cp_error ("template declaration of `%#D'", decl); |
51c184be | 2331 | else |
5566b478 | 2332 | DECL_TEMPLATE_INFO (decl) = info; |
3ac3d9ea MM |
2333 | |
2334 | return DECL_TEMPLATE_RESULT (tmpl); | |
8d08fdba MS |
2335 | } |
2336 | ||
6757edfe MM |
2337 | tree |
2338 | push_template_decl (decl) | |
2339 | tree decl; | |
2340 | { | |
2341 | return push_template_decl_real (decl, 0); | |
2342 | } | |
2343 | ||
2344 | /* Called when a class template TYPE is redeclared with the indicated | |
2345 | template PARMS, e.g.: | |
7fe6899f MM |
2346 | |
2347 | template <class T> struct S; | |
2348 | template <class T> struct S {}; */ | |
2349 | ||
2350 | void | |
6757edfe | 2351 | redeclare_class_template (type, parms) |
7fe6899f | 2352 | tree type; |
6757edfe | 2353 | tree parms; |
7fe6899f MM |
2354 | { |
2355 | tree tmpl = CLASSTYPE_TI_TEMPLATE (type); | |
6757edfe | 2356 | tree tmpl_parms; |
7fe6899f MM |
2357 | int i; |
2358 | ||
2359 | if (!PRIMARY_TEMPLATE_P (tmpl)) | |
2360 | /* The type is nested in some template class. Nothing to worry | |
2361 | about here; there are no new template parameters for the nested | |
2362 | type. */ | |
2363 | return; | |
2364 | ||
6757edfe MM |
2365 | parms = INNERMOST_TEMPLATE_PARMS (parms); |
2366 | tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl); | |
2367 | ||
7fe6899f MM |
2368 | if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms)) |
2369 | { | |
8251199e JM |
2370 | cp_error_at ("previous declaration `%D'", tmpl); |
2371 | cp_error ("used %d template parameter%s instead of %d", | |
7fe6899f MM |
2372 | TREE_VEC_LENGTH (tmpl_parms), |
2373 | TREE_VEC_LENGTH (tmpl_parms) == 1 ? "" : "s", | |
2374 | TREE_VEC_LENGTH (parms)); | |
2375 | return; | |
2376 | } | |
2377 | ||
2378 | for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i) | |
2379 | { | |
2380 | tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i)); | |
2381 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); | |
2382 | tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)); | |
2383 | tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i)); | |
2384 | ||
2385 | if (TREE_CODE (tmpl_parm) != TREE_CODE (parm)) | |
2386 | { | |
8251199e JM |
2387 | cp_error_at ("template parameter `%#D'", tmpl_parm); |
2388 | cp_error ("redeclared here as `%#D'", parm); | |
7fe6899f MM |
2389 | return; |
2390 | } | |
2391 | ||
2392 | if (tmpl_default != NULL_TREE && parm_default != NULL_TREE) | |
2393 | { | |
2394 | /* We have in [temp.param]: | |
2395 | ||
2396 | A template-parameter may not be given default arguments | |
2397 | by two different declarations in the same scope. */ | |
8251199e JM |
2398 | cp_error ("redefinition of default argument for `%#D'", parm); |
2399 | cp_error_at (" original definition appeared here", tmpl_parm); | |
7fe6899f MM |
2400 | return; |
2401 | } | |
2402 | ||
2403 | if (parm_default != NULL_TREE) | |
2404 | /* Update the previous template parameters (which are the ones | |
2405 | that will really count) with the new default value. */ | |
2406 | TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default; | |
2407 | } | |
2408 | } | |
75650646 | 2409 | |
75650646 MM |
2410 | /* Attempt to convert the non-type template parameter EXPR to the |
2411 | indicated TYPE. If the conversion is successful, return the | |
2412 | converted value. If the conversion is unsuccesful, return | |
2413 | NULL_TREE if we issued an error message, or error_mark_node if we | |
2414 | did not. We issue error messages for out-and-out bad template | |
2415 | parameters, but not simply because the conversion failed, since we | |
2416 | might be just trying to do argument deduction. By the time this | |
2417 | function is called, neither TYPE nor EXPR may make use of template | |
2418 | parameters. */ | |
2419 | ||
2420 | static tree | |
e1467ff2 | 2421 | convert_nontype_argument (type, expr) |
75650646 MM |
2422 | tree type; |
2423 | tree expr; | |
2424 | { | |
2425 | tree expr_type = TREE_TYPE (expr); | |
2426 | ||
2427 | /* A template-argument for a non-type, non-template | |
2428 | template-parameter shall be one of: | |
2429 | ||
2430 | --an integral constant-expression of integral or enumeration | |
2431 | type; or | |
2432 | ||
2433 | --the name of a non-type template-parameter; or | |
2434 | ||
2435 | --the name of an object or function with external linkage, | |
2436 | including function templates and function template-ids but | |
86052cc3 | 2437 | excluding non-static class members, expressed as id-expression; |
75650646 MM |
2438 | or |
2439 | ||
2440 | --the address of an object or function with external linkage, | |
2441 | including function templates and function template-ids but | |
2442 | excluding non-static class members, expressed as & id-expression | |
2443 | where the & is optional if the name refers to a function or | |
2444 | array; or | |
2445 | ||
2446 | --a pointer to member expressed as described in _expr.unary.op_. */ | |
2447 | ||
86052cc3 JM |
2448 | /* An integral constant-expression can include const variables |
2449 | or enumerators. */ | |
2450 | if (INTEGRAL_TYPE_P (expr_type) && TREE_READONLY_DECL_P (expr)) | |
2451 | expr = decl_constant_value (expr); | |
2452 | ||
7bf2682f MM |
2453 | if (is_overloaded_fn (expr)) |
2454 | /* OK for now. We'll check that it has external linkage later. | |
2455 | Check this first since if expr_type is the unknown_type_node | |
2456 | we would otherwise complain below. */ | |
2457 | ; | |
f3400fe2 JM |
2458 | else if (TYPE_PTR_P (expr_type) |
2459 | || TREE_CODE (expr_type) == ARRAY_TYPE | |
2460 | || TREE_CODE (type) == REFERENCE_TYPE | |
75650646 MM |
2461 | /* If expr is the address of an overloaded function, we |
2462 | will get the unknown_type_node at this point. */ | |
2463 | || expr_type == unknown_type_node) | |
2464 | { | |
2465 | tree referent; | |
49bf0d6f MM |
2466 | tree e = expr; |
2467 | STRIP_NOPS (e); | |
75650646 | 2468 | |
f3400fe2 JM |
2469 | if (TREE_CODE (type) == REFERENCE_TYPE |
2470 | || TREE_CODE (expr_type) == ARRAY_TYPE) | |
2471 | referent = e; | |
2472 | else | |
75650646 | 2473 | { |
f3400fe2 JM |
2474 | if (TREE_CODE (e) != ADDR_EXPR) |
2475 | { | |
2476 | bad_argument: | |
2477 | cp_error ("`%E' is not a valid template argument", expr); | |
2478 | error ("it must be %s%s with external linkage", | |
2479 | TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE | |
2480 | ? "a pointer to " : "", | |
2481 | TREE_CODE (TREE_TYPE (TREE_TYPE (expr))) == FUNCTION_TYPE | |
2482 | ? "a function" : "an object"); | |
2483 | return NULL_TREE; | |
2484 | } | |
2485 | ||
2486 | referent = TREE_OPERAND (e, 0); | |
2487 | STRIP_NOPS (referent); | |
75650646 MM |
2488 | } |
2489 | ||
75650646 MM |
2490 | if (TREE_CODE (referent) == STRING_CST) |
2491 | { | |
8251199e | 2492 | cp_error ("string literal %E is not a valid template argument", |
75650646 | 2493 | referent); |
8251199e | 2494 | error ("because it is the address of an object with static linkage"); |
75650646 MM |
2495 | return NULL_TREE; |
2496 | } | |
2497 | ||
2498 | if (is_overloaded_fn (referent)) | |
2499 | /* We'll check that it has external linkage later. */ | |
2500 | ; | |
2501 | else if (TREE_CODE (referent) != VAR_DECL) | |
2502 | goto bad_argument; | |
2503 | else if (!TREE_PUBLIC (referent)) | |
2504 | { | |
8251199e | 2505 | cp_error ("address of non-extern `%E' cannot be used as template argument", referent); |
75650646 MM |
2506 | return error_mark_node; |
2507 | } | |
2508 | } | |
f3400fe2 JM |
2509 | else if (INTEGRAL_TYPE_P (expr_type) |
2510 | || TYPE_PTRMEM_P (expr_type) | |
2511 | || TYPE_PTRMEMFUNC_P (expr_type) | |
2512 | /* The next two are g++ extensions. */ | |
2513 | || TREE_CODE (expr_type) == REAL_TYPE | |
2514 | || TREE_CODE (expr_type) == COMPLEX_TYPE) | |
75650646 | 2515 | { |
f3400fe2 JM |
2516 | if (! TREE_CONSTANT (expr)) |
2517 | { | |
2518 | non_constant: | |
2519 | cp_error ("non-constant `%E' cannot be used as template argument", | |
2520 | expr); | |
2521 | return NULL_TREE; | |
2522 | } | |
75650646 | 2523 | } |
75650646 MM |
2524 | else |
2525 | { | |
8251199e | 2526 | cp_error ("object `%E' cannot be used as template argument", expr); |
75650646 MM |
2527 | return NULL_TREE; |
2528 | } | |
2529 | ||
2530 | switch (TREE_CODE (type)) | |
2531 | { | |
2532 | case INTEGER_TYPE: | |
2533 | case BOOLEAN_TYPE: | |
2534 | case ENUMERAL_TYPE: | |
2535 | /* For a non-type template-parameter of integral or enumeration | |
2536 | type, integral promotions (_conv.prom_) and integral | |
2537 | conversions (_conv.integral_) are applied. */ | |
2538 | if (!INTEGRAL_TYPE_P (expr_type)) | |
2539 | return error_mark_node; | |
2540 | ||
2541 | /* It's safe to call digest_init in this case; we know we're | |
2542 | just converting one integral constant expression to another. */ | |
db02b6b9 | 2543 | expr = digest_init (type, expr, (tree*) 0); |
75650646 | 2544 | |
db02b6b9 | 2545 | if (TREE_CODE (expr) != INTEGER_CST) |
f3400fe2 | 2546 | /* Curiously, some TREE_CONSTANT integral expressions do not |
db02b6b9 MM |
2547 | simplify to integer constants. For example, `3 % 0', |
2548 | remains a TRUNC_MOD_EXPR. */ | |
2549 | goto non_constant; | |
2550 | ||
2551 | return expr; | |
2552 | ||
abff8e06 JM |
2553 | case REAL_TYPE: |
2554 | case COMPLEX_TYPE: | |
2555 | /* These are g++ extensions. */ | |
2556 | if (TREE_CODE (expr_type) != TREE_CODE (type)) | |
2557 | return error_mark_node; | |
2558 | ||
db02b6b9 MM |
2559 | expr = digest_init (type, expr, (tree*) 0); |
2560 | ||
2561 | if (TREE_CODE (expr) != REAL_CST) | |
2562 | goto non_constant; | |
2563 | ||
2564 | return expr; | |
abff8e06 | 2565 | |
75650646 MM |
2566 | case POINTER_TYPE: |
2567 | { | |
2568 | tree type_pointed_to = TREE_TYPE (type); | |
2569 | ||
2570 | if (TYPE_PTRMEM_P (type)) | |
2571 | /* For a non-type template-parameter of type pointer to data | |
2572 | member, qualification conversions (_conv.qual_) are | |
2573 | applied. */ | |
2574 | return perform_qualification_conversions (type, expr); | |
2575 | else if (TREE_CODE (type_pointed_to) == FUNCTION_TYPE) | |
2576 | { | |
2577 | /* For a non-type template-parameter of type pointer to | |
2578 | function, only the function-to-pointer conversion | |
2579 | (_conv.func_) is applied. If the template-argument | |
2580 | represents a set of overloaded functions (or a pointer to | |
2581 | such), the matching function is selected from the set | |
2582 | (_over.over_). */ | |
2583 | tree fns; | |
2584 | tree fn; | |
2585 | ||
7bf2682f | 2586 | if (TREE_CODE (expr) == ADDR_EXPR) |
75650646 MM |
2587 | fns = TREE_OPERAND (expr, 0); |
2588 | else | |
2589 | fns = expr; | |
2590 | ||
a05273d4 | 2591 | fn = instantiate_type (type_pointed_to, fns, 0); |
75650646 MM |
2592 | |
2593 | if (fn == error_mark_node) | |
2594 | return error_mark_node; | |
2595 | ||
2596 | if (!TREE_PUBLIC (fn)) | |
2597 | { | |
2598 | if (really_overloaded_fn (fns)) | |
2599 | return error_mark_node; | |
2600 | else | |
2601 | goto bad_argument; | |
2602 | } | |
2603 | ||
2604 | expr = build_unary_op (ADDR_EXPR, fn, 0); | |
2605 | ||
3bfdc719 | 2606 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
2607 | 0); |
2608 | return expr; | |
2609 | } | |
2610 | else | |
2611 | { | |
2612 | /* For a non-type template-parameter of type pointer to | |
2613 | object, qualification conversions (_conv.qual_) and the | |
2614 | array-to-pointer conversion (_conv.array_) are applied. | |
2615 | [Note: In particular, neither the null pointer conversion | |
2616 | (_conv.ptr_) nor the derived-to-base conversion | |
2617 | (_conv.ptr_) are applied. Although 0 is a valid | |
2618 | template-argument for a non-type template-parameter of | |
2619 | integral type, it is not a valid template-argument for a | |
e1467ff2 MM |
2620 | non-type template-parameter of pointer type.] |
2621 | ||
2622 | The call to decay_conversion performs the | |
2623 | array-to-pointer conversion, if appropriate. */ | |
2624 | expr = decay_conversion (expr); | |
75650646 MM |
2625 | |
2626 | if (expr == error_mark_node) | |
2627 | return error_mark_node; | |
2628 | else | |
2629 | return perform_qualification_conversions (type, expr); | |
2630 | } | |
2631 | } | |
2632 | break; | |
2633 | ||
2634 | case REFERENCE_TYPE: | |
2635 | { | |
2636 | tree type_referred_to = TREE_TYPE (type); | |
2637 | ||
2638 | if (TREE_CODE (type_referred_to) == FUNCTION_TYPE) | |
2639 | { | |
2640 | /* For a non-type template-parameter of type reference to | |
39c01e4c MM |
2641 | function, no conversions apply. If the |
2642 | template-argument represents a set of overloaded | |
2643 | functions, the matching function is selected from the | |
2644 | set (_over.over_). */ | |
75650646 MM |
2645 | tree fns = expr; |
2646 | tree fn; | |
2647 | ||
a05273d4 | 2648 | fn = instantiate_type (type_referred_to, fns, 0); |
e6e174e5 JM |
2649 | |
2650 | if (fn == error_mark_node) | |
2651 | return error_mark_node; | |
75650646 MM |
2652 | |
2653 | if (!TREE_PUBLIC (fn)) | |
2654 | { | |
2655 | if (really_overloaded_fn (fns)) | |
2656 | /* Don't issue an error here; we might get a different | |
2657 | function if the overloading had worked out | |
2658 | differently. */ | |
2659 | return error_mark_node; | |
2660 | else | |
2661 | goto bad_argument; | |
2662 | } | |
2663 | ||
3bfdc719 MM |
2664 | my_friendly_assert (same_type_p (type_referred_to, |
2665 | TREE_TYPE (fn)), | |
75650646 MM |
2666 | 0); |
2667 | ||
2668 | return fn; | |
2669 | } | |
2670 | else | |
2671 | { | |
2672 | /* For a non-type template-parameter of type reference to | |
2673 | object, no conversions apply. The type referred to by the | |
2674 | reference may be more cv-qualified than the (otherwise | |
2675 | identical) type of the template-argument. The | |
2676 | template-parameter is bound directly to the | |
2677 | template-argument, which must be an lvalue. */ | |
ff350acd JM |
2678 | if ((TYPE_MAIN_VARIANT (expr_type) |
2679 | != TYPE_MAIN_VARIANT (type_referred_to)) | |
91063b51 MM |
2680 | || !at_least_as_qualified_p (type_referred_to, |
2681 | expr_type) | |
75650646 MM |
2682 | || !real_lvalue_p (expr)) |
2683 | return error_mark_node; | |
2684 | else | |
2685 | return expr; | |
2686 | } | |
2687 | } | |
2688 | break; | |
2689 | ||
2690 | case RECORD_TYPE: | |
2691 | { | |
410c2fba KL |
2692 | if (!TYPE_PTRMEMFUNC_P (type)) |
2693 | /* This handles templates like | |
2694 | template<class T, T t> void f(); | |
2695 | when T is substituted with any class. The second template | |
2696 | parameter becomes invalid and the template candidate is | |
2697 | rejected. */ | |
2698 | return error_mark_node; | |
75650646 MM |
2699 | |
2700 | /* For a non-type template-parameter of type pointer to member | |
2701 | function, no conversions apply. If the template-argument | |
2702 | represents a set of overloaded member functions, the | |
2703 | matching member function is selected from the set | |
2704 | (_over.over_). */ | |
2705 | ||
2706 | if (!TYPE_PTRMEMFUNC_P (expr_type) && | |
2707 | expr_type != unknown_type_node) | |
2708 | return error_mark_node; | |
2709 | ||
2710 | if (TREE_CODE (expr) == CONSTRUCTOR) | |
2711 | { | |
2712 | /* A ptr-to-member constant. */ | |
3bfdc719 | 2713 | if (!same_type_p (type, expr_type)) |
75650646 MM |
2714 | return error_mark_node; |
2715 | else | |
2716 | return expr; | |
2717 | } | |
2718 | ||
2719 | if (TREE_CODE (expr) != ADDR_EXPR) | |
2720 | return error_mark_node; | |
2721 | ||
d8f8dca1 | 2722 | expr = instantiate_type (type, expr, 0); |
75650646 | 2723 | |
d8f8dca1 | 2724 | if (expr == error_mark_node) |
75650646 MM |
2725 | return error_mark_node; |
2726 | ||
3bfdc719 | 2727 | my_friendly_assert (same_type_p (type, TREE_TYPE (expr)), |
75650646 MM |
2728 | 0); |
2729 | return expr; | |
2730 | } | |
2731 | break; | |
2732 | ||
2733 | default: | |
2734 | /* All non-type parameters must have one of these types. */ | |
2735 | my_friendly_abort (0); | |
2736 | break; | |
2737 | } | |
2738 | ||
2739 | return error_mark_node; | |
2740 | } | |
2741 | ||
744fac59 KL |
2742 | /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for |
2743 | template template parameters. Both PARM_PARMS and ARG_PARMS are | |
2744 | vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL | |
2745 | or PARM_DECL. | |
2746 | ||
2747 | ARG_PARMS may contain more parameters than PARM_PARMS. If this is | |
2748 | the case, then extra parameters must have default arguments. | |
2749 | ||
2750 | Consider the example: | |
2751 | template <class T, class Allocator = allocator> class vector; | |
2752 | template<template <class U> class TT> class C; | |
2753 | ||
2754 | C<vector> is a valid instantiation. PARM_PARMS for the above code | |
2755 | contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for | |
2756 | T and Allocator) and OUTER_ARGS contains the argument that is used to | |
2757 | substitute the TT parameter. */ | |
2758 | ||
2759 | static int | |
2760 | coerce_template_template_parms (parm_parms, arg_parms, in_decl, outer_args) | |
2761 | tree parm_parms, arg_parms, in_decl, outer_args; | |
2762 | { | |
2763 | int nparms, nargs, i; | |
2764 | tree parm, arg; | |
2765 | ||
2766 | my_friendly_assert (TREE_CODE (parm_parms) == TREE_VEC, 0); | |
2767 | my_friendly_assert (TREE_CODE (arg_parms) == TREE_VEC, 0); | |
2768 | ||
2769 | nparms = TREE_VEC_LENGTH (parm_parms); | |
2770 | nargs = TREE_VEC_LENGTH (arg_parms); | |
2771 | ||
2772 | /* The rule here is opposite of coerce_template_parms. */ | |
2773 | if (nargs < nparms | |
2774 | || (nargs > nparms | |
2775 | && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE)) | |
2776 | return 0; | |
2777 | ||
2778 | for (i = 0; i < nparms; ++i) | |
2779 | { | |
2780 | parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i)); | |
2781 | arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i)); | |
2782 | ||
2783 | if (arg == NULL_TREE || arg == error_mark_node | |
2784 | || parm == NULL_TREE || parm == error_mark_node) | |
2785 | return 0; | |
2786 | ||
2787 | if (TREE_CODE (arg) != TREE_CODE (parm)) | |
2788 | return 0; | |
2789 | ||
2790 | switch (TREE_CODE (parm)) | |
2791 | { | |
2792 | case TYPE_DECL: | |
2793 | break; | |
2794 | ||
2795 | case TEMPLATE_DECL: | |
2796 | /* We encounter instantiations of templates like | |
2797 | template <template <template <class> class> class TT> | |
2798 | class C; */ | |
2799 | sorry ("nested template template parameter"); | |
2800 | return 0; | |
2801 | ||
2802 | case PARM_DECL: | |
2803 | /* The tsubst call is used to handle cases such as | |
2804 | template <class T, template <T> class TT> class D; | |
2805 | i.e. the parameter list of TT depends on earlier parameters. */ | |
3bfdc719 MM |
2806 | if (!same_type_p (tsubst (TREE_TYPE (parm), outer_args, in_decl), |
2807 | TREE_TYPE (arg))) | |
744fac59 KL |
2808 | return 0; |
2809 | break; | |
2810 | ||
2811 | default: | |
2812 | my_friendly_abort (0); | |
2813 | } | |
2814 | } | |
2815 | return 1; | |
2816 | } | |
2817 | ||
8b5b8b7c MM |
2818 | /* Convert the indicated template ARG as necessary to match the |
2819 | indicated template PARM. Returns the converted ARG, or | |
2820 | error_mark_node if the conversion was unsuccessful. Error messages | |
2821 | are issued if COMPLAIN is non-zero. This conversion is for the Ith | |
2822 | parameter in the parameter list. ARGS is the full set of template | |
2823 | arguments deduced so far. */ | |
2824 | ||
2825 | static tree | |
2826 | convert_template_argument (parm, arg, args, complain, i, in_decl) | |
2827 | tree parm; | |
2828 | tree arg; | |
2829 | tree args; | |
2830 | int complain; | |
2831 | int i; | |
2832 | tree in_decl; | |
2833 | { | |
2834 | tree val; | |
2835 | tree inner_args; | |
2836 | int is_type, requires_type, is_tmpl_type, requires_tmpl_type; | |
2837 | ||
2838 | inner_args = innermost_args (args); | |
2839 | ||
2840 | if (TREE_CODE (arg) == TREE_LIST | |
2841 | && TREE_TYPE (arg) != NULL_TREE | |
2842 | && TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
2843 | { | |
2844 | /* The template argument was the name of some | |
2845 | member function. That's usually | |
2846 | illegal, but static members are OK. In any | |
2847 | case, grab the underlying fields/functions | |
2848 | and issue an error later if required. */ | |
2849 | arg = TREE_VALUE (arg); | |
2850 | TREE_TYPE (arg) = unknown_type_node; | |
2851 | } | |
2852 | ||
2853 | requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL; | |
2854 | requires_type = (TREE_CODE (parm) == TYPE_DECL | |
2855 | || requires_tmpl_type); | |
2856 | ||
2857 | /* Check if it is a class template. If REQUIRES_TMPL_TYPE is true, | |
2858 | we also accept implicitly created TYPE_DECL as a valid argument. | |
2859 | This is necessary to handle the case where we pass a template name | |
2860 | to a template template parameter in a scope where we've derived from | |
2861 | in instantiation of that template, so the template name refers to that | |
2862 | instantiation. We really ought to handle this better. */ | |
2863 | is_tmpl_type | |
2864 | = ((TREE_CODE (arg) == TEMPLATE_DECL | |
2865 | && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL) | |
2866 | || (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM | |
7ddedda4 | 2867 | && !TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (arg)) |
8b5b8b7c MM |
2868 | || (TREE_CODE (arg) == RECORD_TYPE |
2869 | && CLASSTYPE_TEMPLATE_INFO (arg) | |
2870 | && TREE_CODE (TYPE_NAME (arg)) == TYPE_DECL | |
2871 | && DECL_ARTIFICIAL (TYPE_NAME (arg)) | |
2872 | && requires_tmpl_type | |
b54ccf71 | 2873 | && is_base_of_enclosing_class (arg, current_class_type))); |
8b5b8b7c MM |
2874 | if (is_tmpl_type && TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) |
2875 | arg = TYPE_STUB_DECL (arg); | |
2876 | else if (is_tmpl_type && TREE_CODE (arg) == RECORD_TYPE) | |
2877 | arg = CLASSTYPE_TI_TEMPLATE (arg); | |
2878 | ||
2879 | is_type = TREE_CODE_CLASS (TREE_CODE (arg)) == 't' || is_tmpl_type; | |
2880 | ||
2881 | if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF | |
2882 | && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM) | |
2883 | { | |
8251199e JM |
2884 | cp_pedwarn ("to refer to a type member of a template parameter,"); |
2885 | cp_pedwarn (" use `typename %E'", arg); | |
8b5b8b7c MM |
2886 | |
2887 | arg = make_typename_type (TREE_OPERAND (arg, 0), | |
2888 | TREE_OPERAND (arg, 1)); | |
2889 | is_type = 1; | |
2890 | } | |
2891 | if (is_type != requires_type) | |
2892 | { | |
2893 | if (in_decl) | |
2894 | { | |
2895 | if (complain) | |
2896 | { | |
8251199e | 2897 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
2898 | i + 1, in_decl); |
2899 | if (is_type) | |
8251199e | 2900 | cp_error (" expected a constant of type `%T', got `%T'", |
8b5b8b7c MM |
2901 | TREE_TYPE (parm), |
2902 | (is_tmpl_type ? DECL_NAME (arg) : arg)); | |
2903 | else | |
8251199e | 2904 | cp_error (" expected a type, got `%E'", arg); |
8b5b8b7c MM |
2905 | } |
2906 | } | |
2907 | return error_mark_node; | |
2908 | } | |
2909 | if (is_tmpl_type ^ requires_tmpl_type) | |
2910 | { | |
2911 | if (in_decl && complain) | |
2912 | { | |
8251199e | 2913 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c MM |
2914 | i + 1, in_decl); |
2915 | if (is_tmpl_type) | |
8251199e | 2916 | cp_error (" expected a type, got `%T'", DECL_NAME (arg)); |
8b5b8b7c | 2917 | else |
8251199e | 2918 | cp_error (" expected a class template, got `%T'", arg); |
8b5b8b7c MM |
2919 | } |
2920 | return error_mark_node; | |
2921 | } | |
2922 | ||
2923 | if (is_type) | |
2924 | { | |
2925 | if (requires_tmpl_type) | |
2926 | { | |
2927 | tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm); | |
2928 | tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg); | |
2929 | ||
2930 | if (coerce_template_template_parms (parmparm, argparm, | |
2931 | in_decl, inner_args)) | |
2932 | { | |
2933 | val = arg; | |
2934 | ||
2935 | /* TEMPLATE_TEMPLATE_PARM node is preferred over | |
2936 | TEMPLATE_DECL. */ | |
2937 | if (val != error_mark_node | |
2938 | && DECL_TEMPLATE_TEMPLATE_PARM_P (val)) | |
2939 | val = TREE_TYPE (val); | |
2940 | } | |
2941 | else | |
2942 | { | |
2943 | if (in_decl && complain) | |
2944 | { | |
8251199e | 2945 | cp_error ("type/value mismatch at argument %d in template parameter list for `%D'", |
8b5b8b7c | 2946 | i + 1, in_decl); |
8251199e | 2947 | cp_error (" expected a template of type `%D', got `%D'", parm, arg); |
8b5b8b7c MM |
2948 | } |
2949 | ||
2950 | val = error_mark_node; | |
2951 | } | |
2952 | } | |
2953 | else | |
2954 | { | |
2955 | val = groktypename (arg); | |
2956 | if (! processing_template_decl) | |
2957 | { | |
2958 | /* [basic.link]: A name with no linkage (notably, the | |
2959 | name of a class or enumeration declared in a local | |
2960 | scope) shall not be used to declare an entity with | |
2961 | linkage. This implies that names with no linkage | |
2962 | cannot be used as template arguments. */ | |
2963 | tree t = no_linkage_check (val); | |
2964 | if (t) | |
2965 | { | |
2966 | if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t))) | |
8251199e JM |
2967 | cp_pedwarn |
2968 | ("template-argument `%T' uses anonymous type", val); | |
8b5b8b7c | 2969 | else |
8251199e JM |
2970 | cp_error |
2971 | ("template-argument `%T' uses local type `%T'", | |
8b5b8b7c MM |
2972 | val, t); |
2973 | return error_mark_node; | |
2974 | } | |
2975 | } | |
2976 | } | |
2977 | } | |
2978 | else | |
2979 | { | |
2980 | tree t = tsubst (TREE_TYPE (parm), args, in_decl); | |
2981 | ||
2982 | if (processing_template_decl) | |
2983 | arg = maybe_fold_nontype_arg (arg); | |
2984 | ||
2985 | if (!uses_template_parms (arg) && !uses_template_parms (t)) | |
2986 | /* We used to call digest_init here. However, digest_init | |
2987 | will report errors, which we don't want when complain | |
2988 | is zero. More importantly, digest_init will try too | |
2989 | hard to convert things: for example, `0' should not be | |
2990 | converted to pointer type at this point according to | |
2991 | the standard. Accepting this is not merely an | |
2992 | extension, since deciding whether or not these | |
2993 | conversions can occur is part of determining which | |
2994 | function template to call, or whether a given epxlicit | |
2995 | argument specification is legal. */ | |
2996 | val = convert_nontype_argument (t, arg); | |
2997 | else | |
2998 | val = arg; | |
2999 | ||
3000 | if (val == NULL_TREE) | |
3001 | val = error_mark_node; | |
3002 | else if (val == error_mark_node && complain) | |
8251199e | 3003 | cp_error ("could not convert template argument `%E' to `%T'", |
8b5b8b7c MM |
3004 | arg, t); |
3005 | } | |
3006 | ||
3007 | return val; | |
3008 | } | |
3009 | ||
3010 | /* Convert all template arguments to their appropriate types, and | |
3011 | return a vector containing the innermost resulting template | |
3012 | arguments. If any error occurs, return error_mark_node, and, if | |
3013 | COMPLAIN is non-zero, issue an error message. Some error messages | |
3014 | are issued even if COMPLAIN is zero; for instance, if a template | |
3015 | argument is composed from a local class. | |
75650646 MM |
3016 | |
3017 | If REQUIRE_ALL_ARGUMENTS is non-zero, all arguments must be | |
3018 | provided in ARGLIST, or else trailing parameters must have default | |
3019 | values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument | |
cabc336a MM |
3020 | deduction for any unspecified trailing arguments. |
3021 | ||
3022 | The resulting TREE_VEC is allocated on a temporary obstack, and | |
3023 | must be explicitly copied if it will be permanent. */ | |
de575009 | 3024 | |
8d08fdba | 3025 | static tree |
8b5b8b7c | 3026 | coerce_template_parms (parms, args, in_decl, |
75650646 | 3027 | complain, |
744fac59 | 3028 | require_all_arguments) |
8b5b8b7c | 3029 | tree parms, args; |
8d08fdba | 3030 | tree in_decl; |
75650646 MM |
3031 | int complain; |
3032 | int require_all_arguments; | |
8d08fdba | 3033 | { |
a292b002 | 3034 | int nparms, nargs, i, lost = 0; |
e4a84209 | 3035 | tree inner_args; |
8b5b8b7c MM |
3036 | tree new_args; |
3037 | tree new_inner_args; | |
a292b002 | 3038 | |
8b5b8b7c | 3039 | inner_args = innermost_args (args); |
e4a84209 | 3040 | nargs = NUM_TMPL_ARGS (inner_args); |
a292b002 MS |
3041 | nparms = TREE_VEC_LENGTH (parms); |
3042 | ||
3043 | if (nargs > nparms | |
3044 | || (nargs < nparms | |
75650646 | 3045 | && require_all_arguments |
a292b002 | 3046 | && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE)) |
8d08fdba | 3047 | { |
75650646 MM |
3048 | if (complain) |
3049 | { | |
8251199e | 3050 | cp_error ("wrong number of template arguments (%d, should be %d)", |
e4a84209 | 3051 | nargs, nparms); |
75650646 MM |
3052 | |
3053 | if (in_decl) | |
8251199e | 3054 | cp_error_at ("provided for `%D'", in_decl); |
75650646 MM |
3055 | } |
3056 | ||
8d08fdba MS |
3057 | return error_mark_node; |
3058 | } | |
3059 | ||
cabc336a | 3060 | new_inner_args = make_temp_vec (nparms); |
8b5b8b7c MM |
3061 | new_args = add_outermost_template_args (args, new_inner_args); |
3062 | for (i = 0; i < nparms; i++) | |
8d08fdba | 3063 | { |
8b5b8b7c MM |
3064 | tree arg; |
3065 | tree parm; | |
e4a84209 | 3066 | |
8b5b8b7c MM |
3067 | /* Get the Ith template parameter. */ |
3068 | parm = TREE_VEC_ELT (parms, i); | |
75650646 | 3069 | |
8b5b8b7c MM |
3070 | /* Calculate the Ith argument. */ |
3071 | if (inner_args && TREE_CODE (inner_args) == TREE_LIST) | |
8d08fdba | 3072 | { |
8b5b8b7c MM |
3073 | arg = TREE_VALUE (inner_args); |
3074 | inner_args = TREE_CHAIN (inner_args); | |
8d08fdba | 3075 | } |
8b5b8b7c MM |
3076 | else if (i < nargs) |
3077 | arg = TREE_VEC_ELT (inner_args, i); | |
3078 | /* If no template argument was supplied, look for a default | |
3079 | value. */ | |
3080 | else if (TREE_PURPOSE (parm) == NULL_TREE) | |
3081 | { | |
3082 | /* There was no default value. */ | |
3083 | my_friendly_assert (!require_all_arguments, 0); | |
3084 | break; | |
3085 | } | |
3086 | else if (TREE_CODE (TREE_VALUE (parm)) == TYPE_DECL) | |
3087 | arg = tsubst (TREE_PURPOSE (parm), new_args, in_decl); | |
3088 | else | |
3089 | arg = tsubst_expr (TREE_PURPOSE (parm), new_args, in_decl); | |
e4a84209 | 3090 | |
8b5b8b7c | 3091 | /* Now, convert the Ith argument, as necessary. */ |
75650646 MM |
3092 | if (arg == NULL_TREE) |
3093 | /* We're out of arguments. */ | |
3094 | { | |
3095 | my_friendly_assert (!require_all_arguments, 0); | |
3096 | break; | |
3097 | } | |
8b5b8b7c | 3098 | else if (arg == error_mark_node) |
75650646 | 3099 | { |
8251199e | 3100 | cp_error ("template argument %d is invalid", i + 1); |
8b5b8b7c | 3101 | arg = error_mark_node; |
8d08fdba | 3102 | } |
8b5b8b7c MM |
3103 | else |
3104 | arg = convert_template_argument (TREE_VALUE (parm), | |
3105 | arg, new_args, complain, i, | |
3106 | in_decl); | |
3107 | ||
3108 | if (arg == error_mark_node) | |
8d08fdba | 3109 | lost++; |
8b5b8b7c | 3110 | TREE_VEC_ELT (new_inner_args, i) = arg; |
8d08fdba | 3111 | } |
8b5b8b7c | 3112 | |
8d08fdba MS |
3113 | if (lost) |
3114 | return error_mark_node; | |
8b5b8b7c MM |
3115 | |
3116 | return new_inner_args; | |
8d08fdba MS |
3117 | } |
3118 | ||
34016c81 JM |
3119 | /* Returns 1 if template args OT and NT are equivalent. */ |
3120 | ||
3121 | int | |
3122 | template_args_equal (ot, nt) | |
3123 | tree ot, nt; | |
3124 | { | |
3125 | if (nt == ot) | |
3126 | return 1; | |
3127 | if (TREE_CODE (nt) != TREE_CODE (ot)) | |
3128 | return 0; | |
3129 | if (TREE_CODE (nt) == TREE_VEC) | |
3130 | /* For member templates */ | |
3131 | return comp_template_args (ot, nt); | |
3132 | else if (TREE_CODE_CLASS (TREE_CODE (ot)) == 't') | |
3bfdc719 | 3133 | return same_type_p (ot, nt); |
34016c81 JM |
3134 | else |
3135 | return (cp_tree_equal (ot, nt) > 0); | |
3136 | } | |
3137 | ||
3138 | /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets | |
f84b4be9 JM |
3139 | of template arguments. Returns 0 otherwise. */ |
3140 | ||
6757edfe | 3141 | int |
5566b478 MS |
3142 | comp_template_args (oldargs, newargs) |
3143 | tree oldargs, newargs; | |
3144 | { | |
3145 | int i; | |
3146 | ||
386b8a85 JM |
3147 | if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs)) |
3148 | return 0; | |
3149 | ||
5566b478 MS |
3150 | for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i) |
3151 | { | |
3152 | tree nt = TREE_VEC_ELT (newargs, i); | |
3153 | tree ot = TREE_VEC_ELT (oldargs, i); | |
3154 | ||
34016c81 | 3155 | if (! template_args_equal (ot, nt)) |
61a127b3 | 3156 | return 0; |
5566b478 MS |
3157 | } |
3158 | return 1; | |
3159 | } | |
3160 | ||
8d08fdba MS |
3161 | /* Given class template name and parameter list, produce a user-friendly name |
3162 | for the instantiation. */ | |
e92cc029 | 3163 | |
8d08fdba | 3164 | static char * |
36a117a5 | 3165 | mangle_class_name_for_template (name, parms, arglist) |
8d08fdba MS |
3166 | char *name; |
3167 | tree parms, arglist; | |
3168 | { | |
3169 | static struct obstack scratch_obstack; | |
3170 | static char *scratch_firstobj; | |
3171 | int i, nparms; | |
8d08fdba MS |
3172 | |
3173 | if (!scratch_firstobj) | |
fc378698 | 3174 | gcc_obstack_init (&scratch_obstack); |
8d08fdba MS |
3175 | else |
3176 | obstack_free (&scratch_obstack, scratch_firstobj); | |
fc378698 | 3177 | scratch_firstobj = obstack_alloc (&scratch_obstack, 1); |
8d08fdba | 3178 | |
8d08fdba | 3179 | #define ccat(c) obstack_1grow (&scratch_obstack, (c)); |
8d08fdba | 3180 | #define cat(s) obstack_grow (&scratch_obstack, (s), strlen (s)) |
8d08fdba MS |
3181 | |
3182 | cat (name); | |
3183 | ccat ('<'); | |
3184 | nparms = TREE_VEC_LENGTH (parms); | |
36a117a5 | 3185 | arglist = innermost_args (arglist); |
8d08fdba MS |
3186 | my_friendly_assert (nparms == TREE_VEC_LENGTH (arglist), 268); |
3187 | for (i = 0; i < nparms; i++) | |
3188 | { | |
a292b002 MS |
3189 | tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i)); |
3190 | tree arg = TREE_VEC_ELT (arglist, i); | |
8d08fdba MS |
3191 | |
3192 | if (i) | |
3193 | ccat (','); | |
3194 | ||
a292b002 | 3195 | if (TREE_CODE (parm) == TYPE_DECL) |
8d08fdba | 3196 | { |
294471c3 | 3197 | cat (type_as_string_real (arg, 0, 1)); |
8d08fdba MS |
3198 | continue; |
3199 | } | |
73b0fce8 KL |
3200 | else if (TREE_CODE (parm) == TEMPLATE_DECL) |
3201 | { | |
3202 | if (TREE_CODE (arg) == TEMPLATE_DECL) | |
2c73f9f5 ML |
3203 | { |
3204 | /* Already substituted with real template. Just output | |
3205 | the template name here */ | |
cb0dbb9a JM |
3206 | tree context = DECL_CONTEXT (arg); |
3207 | if (context) | |
2c73f9f5 | 3208 | { |
cb0dbb9a | 3209 | my_friendly_assert (TREE_CODE (context) == NAMESPACE_DECL, 980422); |
2c73f9f5 ML |
3210 | cat(decl_as_string (DECL_CONTEXT (arg), 0)); |
3211 | cat("::"); | |
3212 | } | |
3213 | cat (IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3214 | } | |
73b0fce8 KL |
3215 | else |
3216 | /* Output the parameter declaration */ | |
294471c3 | 3217 | cat (type_as_string_real (arg, 0, 1)); |
73b0fce8 KL |
3218 | continue; |
3219 | } | |
8d08fdba MS |
3220 | else |
3221 | my_friendly_assert (TREE_CODE (parm) == PARM_DECL, 269); | |
3222 | ||
3223 | if (TREE_CODE (arg) == TREE_LIST) | |
3224 | { | |
3225 | /* New list cell was built because old chain link was in | |
3226 | use. */ | |
3227 | my_friendly_assert (TREE_PURPOSE (arg) == NULL_TREE, 270); | |
3228 | arg = TREE_VALUE (arg); | |
3229 | } | |
3230 | /* No need to check arglist against parmlist here; we did that | |
3231 | in coerce_template_parms, called from lookup_template_class. */ | |
3232 | cat (expr_as_string (arg, 0)); | |
3233 | } | |
3234 | { | |
3235 | char *bufp = obstack_next_free (&scratch_obstack); | |
3236 | int offset = 0; | |
3237 | while (bufp[offset - 1] == ' ') | |
3238 | offset--; | |
3239 | obstack_blank_fast (&scratch_obstack, offset); | |
3240 | ||
3241 | /* B<C<char> >, not B<C<char>> */ | |
3242 | if (bufp[offset - 1] == '>') | |
3243 | ccat (' '); | |
3244 | } | |
3245 | ccat ('>'); | |
3246 | ccat ('\0'); | |
3247 | return (char *) obstack_base (&scratch_obstack); | |
8d08fdba MS |
3248 | } |
3249 | ||
bd6dd845 | 3250 | static tree |
5566b478 MS |
3251 | classtype_mangled_name (t) |
3252 | tree t; | |
3253 | { | |
3254 | if (CLASSTYPE_TEMPLATE_INFO (t) | |
36a117a5 MM |
3255 | /* Specializations have already had their names set up in |
3256 | lookup_template_class. */ | |
9fbf56f7 MM |
3257 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
3258 | { | |
3259 | tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t)); | |
3260 | ||
36a117a5 MM |
3261 | /* For non-primary templates, the template parameters are |
3262 | implicit from their surrounding context. */ | |
9fbf56f7 MM |
3263 | if (PRIMARY_TEMPLATE_P (tmpl)) |
3264 | { | |
3265 | tree name = DECL_NAME (tmpl); | |
3266 | char *mangled_name = mangle_class_name_for_template | |
3267 | (IDENTIFIER_POINTER (name), | |
3268 | DECL_INNERMOST_TEMPLATE_PARMS (tmpl), | |
3269 | CLASSTYPE_TI_ARGS (t)); | |
3270 | tree id = get_identifier (mangled_name); | |
3271 | IDENTIFIER_TEMPLATE (id) = name; | |
3272 | return id; | |
3273 | } | |
5566b478 | 3274 | } |
9fbf56f7 MM |
3275 | |
3276 | return TYPE_IDENTIFIER (t); | |
5566b478 MS |
3277 | } |
3278 | ||
3279 | static void | |
3280 | add_pending_template (d) | |
3281 | tree d; | |
3282 | { | |
e92cc029 MS |
3283 | tree ti; |
3284 | ||
3285 | if (TREE_CODE_CLASS (TREE_CODE (d)) == 't') | |
3286 | ti = CLASSTYPE_TEMPLATE_INFO (d); | |
3287 | else | |
3288 | ti = DECL_TEMPLATE_INFO (d); | |
3289 | ||
824b9a4c | 3290 | if (TI_PENDING_TEMPLATE_FLAG (ti)) |
5566b478 MS |
3291 | return; |
3292 | ||
3293 | *template_tail = perm_tree_cons | |
1139b3d8 | 3294 | (build_srcloc_here (), d, NULL_TREE); |
5566b478 | 3295 | template_tail = &TREE_CHAIN (*template_tail); |
824b9a4c | 3296 | TI_PENDING_TEMPLATE_FLAG (ti) = 1; |
5566b478 MS |
3297 | } |
3298 | ||
386b8a85 JM |
3299 | |
3300 | /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS (which | |
3301 | may be either a _DECL or an overloaded function or an | |
3302 | IDENTIFIER_NODE), and ARGLIST. */ | |
3303 | ||
3304 | tree | |
3305 | lookup_template_function (fns, arglist) | |
3306 | tree fns, arglist; | |
3307 | { | |
2c73f9f5 | 3308 | tree type; |
050367a3 | 3309 | |
386b8a85 JM |
3310 | if (fns == NULL_TREE) |
3311 | { | |
8251199e | 3312 | cp_error ("non-template used as template"); |
386b8a85 JM |
3313 | return error_mark_node; |
3314 | } | |
3315 | ||
2c73f9f5 ML |
3316 | type = TREE_TYPE (fns); |
3317 | if (TREE_CODE (fns) == OVERLOAD || !type) | |
3318 | type = unknown_type_node; | |
3319 | ||
672476cb MM |
3320 | if (processing_template_decl) |
3321 | return build_min (TEMPLATE_ID_EXPR, type, fns, arglist); | |
3322 | else | |
3323 | return build (TEMPLATE_ID_EXPR, type, fns, arglist); | |
386b8a85 JM |
3324 | } |
3325 | ||
a2b60a0e MM |
3326 | /* Within the scope of a template class S<T>, the name S gets bound |
3327 | (in build_self_reference) to a TYPE_DECL for the class, not a | |
3328 | TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type, | |
3329 | or one of its enclosing classes, and that type is a template, | |
3330 | return the associated TEMPLATE_DECL. Otherwise, the original | |
3331 | DECL is returned. */ | |
3332 | ||
3333 | tree | |
3334 | maybe_get_template_decl_from_type_decl (decl) | |
3335 | tree decl; | |
3336 | { | |
3337 | return (decl != NULL_TREE | |
3338 | && TREE_CODE (decl) == TYPE_DECL | |
3339 | && DECL_ARTIFICIAL (decl) | |
3340 | && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl))) | |
3341 | ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl; | |
3342 | } | |
386b8a85 | 3343 | |
8d08fdba MS |
3344 | /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of |
3345 | parameters, find the desired type. | |
3346 | ||
3347 | D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments. | |
36a117a5 MM |
3348 | (Actually ARGLIST may be either a TREE_LIST or a TREE_VEC. It will |
3349 | be a TREE_LIST if called directly from the parser, and a TREE_VEC | |
3350 | otherwise.) Since ARGLIST is build on the decl_obstack, we must | |
3351 | copy it here to keep it from being reclaimed when the decl storage | |
3352 | is reclaimed. | |
8d08fdba MS |
3353 | |
3354 | IN_DECL, if non-NULL, is the template declaration we are trying to | |
75650646 MM |
3355 | instantiate. |
3356 | ||
36a117a5 MM |
3357 | If ENTERING_SCOPE is non-zero, we are about to enter the scope of |
3358 | the class we are looking up. | |
3359 | ||
75650646 MM |
3360 | If the template class is really a local class in a template |
3361 | function, then the FUNCTION_CONTEXT is the function in which it is | |
3362 | being instantiated. */ | |
e92cc029 | 3363 | |
8d08fdba | 3364 | tree |
36a117a5 | 3365 | lookup_template_class (d1, arglist, in_decl, context, entering_scope) |
8d08fdba MS |
3366 | tree d1, arglist; |
3367 | tree in_decl; | |
e1467ff2 | 3368 | tree context; |
36a117a5 | 3369 | int entering_scope; |
8d08fdba | 3370 | { |
a703fb38 | 3371 | tree template = NULL_TREE, parmlist; |
dbfe2124 | 3372 | tree t; |
5566b478 MS |
3373 | |
3374 | if (TREE_CODE (d1) == IDENTIFIER_NODE) | |
3375 | { | |
f181d4ae MM |
3376 | if (IDENTIFIER_VALUE (d1) |
3377 | && DECL_TEMPLATE_TEMPLATE_PARM_P (IDENTIFIER_VALUE (d1))) | |
3378 | template = IDENTIFIER_VALUE (d1); | |
73b0fce8 KL |
3379 | else |
3380 | { | |
2c73f9f5 ML |
3381 | if (context) |
3382 | push_decl_namespace (context); | |
67ffc812 MM |
3383 | if (current_class_type != NULL_TREE) |
3384 | template = | |
3385 | maybe_get_template_decl_from_type_decl | |
3386 | (IDENTIFIER_CLASS_VALUE (d1)); | |
a2b60a0e | 3387 | if (template == NULL_TREE) |
2c73f9f5 ML |
3388 | template = lookup_name_nonclass (d1); |
3389 | if (context) | |
3390 | pop_decl_namespace (); | |
73b0fce8 | 3391 | } |
8d019cef JM |
3392 | if (template) |
3393 | context = DECL_CONTEXT (template); | |
5566b478 | 3394 | } |
c91a56d2 MS |
3395 | else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1))) |
3396 | { | |
f3400fe2 JM |
3397 | if (CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (d1))) |
3398 | { | |
3399 | template = CLASSTYPE_TI_TEMPLATE (TREE_TYPE (d1)); | |
3400 | d1 = DECL_NAME (template); | |
3401 | } | |
c91a56d2 | 3402 | } |
ed44da02 MM |
3403 | else if (TREE_CODE (d1) == ENUMERAL_TYPE |
3404 | || (TREE_CODE_CLASS (TREE_CODE (d1)) == 't' | |
3405 | && IS_AGGR_TYPE (d1))) | |
5566b478 | 3406 | { |
ed44da02 | 3407 | template = TYPE_TI_TEMPLATE (d1); |
5566b478 MS |
3408 | d1 = DECL_NAME (template); |
3409 | } | |
93cdc044 JM |
3410 | else if (TREE_CODE (d1) == TEMPLATE_DECL |
3411 | && TREE_CODE (DECL_RESULT (d1)) == TYPE_DECL) | |
3412 | { | |
3413 | template = d1; | |
3414 | d1 = DECL_NAME (template); | |
3415 | context = DECL_CONTEXT (template); | |
3416 | } | |
5566b478 MS |
3417 | else |
3418 | my_friendly_abort (272); | |
8d08fdba | 3419 | |
8d08fdba | 3420 | /* With something like `template <class T> class X class X { ... };' |
f181d4ae MM |
3421 | we could end up with D1 having nothing but an IDENTIFIER_VALUE. |
3422 | We don't want to do that, but we have to deal with the situation, | |
3423 | so let's give them some syntax errors to chew on instead of a | |
3424 | crash. */ | |
8d08fdba | 3425 | if (! template) |
f3400fe2 JM |
3426 | { |
3427 | cp_error ("`%T' is not a template", d1); | |
3428 | return error_mark_node; | |
3429 | } | |
2c73f9f5 | 3430 | |
c3baf4b5 JM |
3431 | if (context == NULL_TREE) |
3432 | context = global_namespace; | |
2c73f9f5 | 3433 | |
8d08fdba MS |
3434 | if (TREE_CODE (template) != TEMPLATE_DECL) |
3435 | { | |
8251199e | 3436 | cp_error ("non-template type `%T' used as a template", d1); |
8d08fdba | 3437 | if (in_decl) |
8251199e | 3438 | cp_error_at ("for template declaration `%D'", in_decl); |
8d08fdba MS |
3439 | return error_mark_node; |
3440 | } | |
8d08fdba | 3441 | |
73b0fce8 KL |
3442 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (template)) |
3443 | { | |
3444 | /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store | |
3445 | template arguments */ | |
3446 | ||
3447 | tree parm = copy_template_template_parm (TREE_TYPE (template)); | |
3448 | tree template2 = TYPE_STUB_DECL (parm); | |
3449 | tree arglist2; | |
3450 | ||
73b0fce8 KL |
3451 | parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template); |
3452 | ||
744fac59 | 3453 | arglist2 = coerce_template_parms (parmlist, arglist, template, 1, 1); |
73b0fce8 KL |
3454 | if (arglist2 == error_mark_node) |
3455 | return error_mark_node; | |
3456 | ||
3457 | arglist2 = copy_to_permanent (arglist2); | |
7ddedda4 | 3458 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm) |
73b0fce8 KL |
3459 | = perm_tree_cons (template2, arglist2, NULL_TREE); |
3460 | TYPE_SIZE (parm) = 0; | |
3461 | return parm; | |
3462 | } | |
36a117a5 | 3463 | else |
8d08fdba | 3464 | { |
36a117a5 MM |
3465 | tree template_type = TREE_TYPE (template); |
3466 | tree type_decl; | |
3467 | tree found = NULL_TREE; | |
3468 | int arg_depth; | |
3469 | int parm_depth; | |
dbfe2124 | 3470 | int is_partial_instantiation; |
830bfa74 | 3471 | |
36a117a5 MM |
3472 | template = most_general_template (template); |
3473 | parmlist = DECL_TEMPLATE_PARMS (template); | |
3474 | parm_depth = TMPL_PARMS_DEPTH (parmlist); | |
3475 | arg_depth = TMPL_ARGS_DEPTH (arglist); | |
3476 | ||
7ddedda4 MM |
3477 | /* We build up the coerced arguments and such on the |
3478 | momentary_obstack. */ | |
3479 | push_momentary (); | |
3480 | ||
36a117a5 MM |
3481 | if (arg_depth == 1 && parm_depth > 1) |
3482 | { | |
39c01e4c | 3483 | /* We've been given an incomplete set of template arguments. |
36a117a5 MM |
3484 | For example, given: |
3485 | ||
3486 | template <class T> struct S1 { | |
3487 | template <class U> struct S2 {}; | |
3488 | template <class U> struct S2<U*> {}; | |
3489 | }; | |
3490 | ||
3491 | we will be called with an ARGLIST of `U*', but the | |
3492 | TEMPLATE will be `template <class T> template | |
3493 | <class U> struct S1<T>::S2'. We must fill in the missing | |
3494 | arguments. */ | |
3495 | my_friendly_assert (context != NULL_TREE, 0); | |
39c01e4c MM |
3496 | while (!IS_AGGR_TYPE_CODE (TREE_CODE (context)) |
3497 | && context != global_namespace) | |
36a117a5 | 3498 | context = DECL_REAL_CONTEXT (context); |
39c01e4c MM |
3499 | |
3500 | if (context == global_namespace) | |
3501 | /* This is bad. We cannot get enough arguments, even from | |
3502 | the surrounding context, to resolve this class. One | |
3503 | case where this might happen is (illegal) code like: | |
3504 | ||
3505 | template <class U> | |
3506 | template <class T> | |
3507 | struct S { | |
3508 | A(const A<T>& a) {} | |
3509 | }; | |
3510 | ||
3511 | We should catch this error sooner (at the opening curly | |
3512 | for `S', but it is better to be safe than sorry here. */ | |
3513 | { | |
8251199e | 3514 | cp_error ("invalid use of `%D'", template); |
39c01e4c MM |
3515 | return error_mark_node; |
3516 | } | |
3517 | ||
ed44da02 | 3518 | arglist = add_to_template_args (TYPE_TI_ARGS (context), |
36a117a5 MM |
3519 | arglist); |
3520 | arg_depth = TMPL_ARGS_DEPTH (arglist); | |
3521 | } | |
5566b478 | 3522 | |
36a117a5 MM |
3523 | my_friendly_assert (parm_depth == arg_depth, 0); |
3524 | ||
3525 | /* Calculate the BOUND_ARGS. These will be the args that are | |
3526 | actually tsubst'd into the definition to create the | |
3527 | instantiation. */ | |
3528 | if (parm_depth > 1) | |
830bfa74 MM |
3529 | { |
3530 | /* We have multiple levels of arguments to coerce, at once. */ | |
830bfa74 | 3531 | int i; |
e4a84209 | 3532 | int saved_depth = TMPL_ARGS_DEPTH (arglist); |
36a117a5 | 3533 | |
cabc336a | 3534 | tree bound_args = make_temp_vec (parm_depth); |
830bfa74 | 3535 | |
e4a84209 | 3536 | for (i = saved_depth, |
830bfa74 | 3537 | t = DECL_TEMPLATE_PARMS (template); |
e4a84209 | 3538 | i > 0 && t != NULL_TREE; |
830bfa74 | 3539 | --i, t = TREE_CHAIN (t)) |
e4a84209 MM |
3540 | { |
3541 | tree a = coerce_template_parms (TREE_VALUE (t), | |
3542 | arglist, template, 1, 1); | |
3543 | SET_TMPL_ARGS_LEVEL (bound_args, i, a); | |
3544 | ||
3545 | /* We temporarily reduce the length of the ARGLIST so | |
3546 | that coerce_template_parms will see only the arguments | |
3547 | corresponding to the template parameters it is | |
3548 | examining. */ | |
3549 | TREE_VEC_LENGTH (arglist)--; | |
3550 | } | |
3551 | ||
3552 | /* Restore the ARGLIST to its full size. */ | |
3553 | TREE_VEC_LENGTH (arglist) = saved_depth; | |
3554 | ||
36a117a5 | 3555 | arglist = bound_args; |
830bfa74 MM |
3556 | } |
3557 | else | |
36a117a5 MM |
3558 | arglist |
3559 | = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist), | |
3560 | innermost_args (arglist), | |
3561 | template, 1, 1); | |
3562 | ||
3563 | if (arglist == error_mark_node) | |
3564 | /* We were unable to bind the arguments. */ | |
5566b478 | 3565 | return error_mark_node; |
5566b478 | 3566 | |
36a117a5 MM |
3567 | /* In the scope of a template class, explicit references to the |
3568 | template class refer to the type of the template, not any | |
3569 | instantiation of it. For example, in: | |
3570 | ||
3571 | template <class T> class C { void f(C<T>); } | |
3572 | ||
3573 | the `C<T>' is just the same as `C'. Outside of the | |
3574 | class, however, such a reference is an instantiation. */ | |
ed44da02 | 3575 | if (comp_template_args (TYPE_TI_ARGS (template_type), |
36a117a5 MM |
3576 | arglist)) |
3577 | { | |
3578 | found = template_type; | |
3579 | ||
3580 | if (!entering_scope && PRIMARY_TEMPLATE_P (template)) | |
5566b478 | 3581 | { |
36a117a5 MM |
3582 | tree ctx; |
3583 | ||
3584 | /* Note that we use DECL_CONTEXT, rather than | |
3585 | CP_DECL_CONTEXT, so that the termination test is | |
3586 | always just `ctx'. We're not interested in namepace | |
3587 | scopes. */ | |
3588 | for (ctx = current_class_type; | |
3589 | ctx; | |
3590 | ctx = (TREE_CODE_CLASS (TREE_CODE (ctx)) == 't') | |
3591 | ? TYPE_CONTEXT (ctx) : DECL_CONTEXT (ctx)) | |
3bfdc719 | 3592 | if (same_type_p (ctx, template_type)) |
36a117a5 MM |
3593 | break; |
3594 | ||
3595 | if (!ctx) | |
3596 | /* We're not in the scope of the class, so the | |
3597 | TEMPLATE_TYPE is not the type we want after | |
3598 | all. */ | |
3599 | found = NULL_TREE; | |
5566b478 MS |
3600 | } |
3601 | } | |
36a117a5 MM |
3602 | |
3603 | if (!found) | |
75650646 | 3604 | { |
36a117a5 MM |
3605 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); |
3606 | found; found = TREE_CHAIN (found)) | |
3607 | if (comp_template_args (TREE_PURPOSE (found), arglist)) | |
3608 | break; | |
75650646 | 3609 | |
36a117a5 MM |
3610 | if (found) |
3611 | found = TREE_VALUE (found); | |
8d08fdba | 3612 | } |
36a117a5 MM |
3613 | |
3614 | if (found) | |
8d08fdba | 3615 | { |
7ddedda4 | 3616 | pop_momentary (); |
36a117a5 | 3617 | return found; |
8d08fdba | 3618 | } |
5566b478 | 3619 | |
36a117a5 MM |
3620 | /* Since we didn't find the type, we'll have to create it. |
3621 | Since we'll be saving this type on the | |
3622 | DECL_TEMPLATE_INSTANTIATIONS list, it must be permanent. */ | |
3623 | push_obstacks (&permanent_obstack, &permanent_obstack); | |
3624 | ||
dbfe2124 | 3625 | /* This type is a "partial instantiation" if any of the template |
486e4077 MM |
3626 | arguments still inolve template parameters. Note that we set |
3627 | IS_PARTIAL_INSTANTIATION for partial specializations as | |
3628 | well. */ | |
dbfe2124 MM |
3629 | is_partial_instantiation = uses_template_parms (arglist); |
3630 | ||
36a117a5 | 3631 | /* Create the type. */ |
ed44da02 MM |
3632 | if (TREE_CODE (template_type) == ENUMERAL_TYPE) |
3633 | { | |
dbfe2124 | 3634 | if (!is_partial_instantiation) |
61a127b3 | 3635 | t = start_enum (TYPE_IDENTIFIER (template_type)); |
ed44da02 | 3636 | else |
dbfe2124 | 3637 | /* We don't want to call start_enum for this type, since |
ed44da02 MM |
3638 | the values for the enumeration constants may involve |
3639 | template parameters. And, no one should be interested | |
3640 | in the enumeration constants for such a type. */ | |
3641 | t = make_node (ENUMERAL_TYPE); | |
3642 | } | |
3643 | else | |
3644 | { | |
3645 | t = make_lang_type (TREE_CODE (template_type)); | |
3646 | CLASSTYPE_DECLARED_CLASS (t) | |
3647 | = CLASSTYPE_DECLARED_CLASS (template_type); | |
3648 | CLASSTYPE_GOT_SEMICOLON (t) = 1; | |
3649 | SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t); | |
f668f160 | 3650 | TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type); |
ed44da02 MM |
3651 | } |
3652 | ||
61a127b3 | 3653 | /* If we called start_enum above, this information will already |
ed44da02 MM |
3654 | be set up. */ |
3655 | if (!TYPE_NAME (t)) | |
3656 | { | |
3657 | TYPE_CONTEXT (t) = FROB_CONTEXT (context); | |
36a117a5 | 3658 | |
ed44da02 MM |
3659 | /* Create a stub TYPE_DECL for it. */ |
3660 | type_decl = build_decl (TYPE_DECL, DECL_NAME (template), t); | |
3661 | SET_DECL_ARTIFICIAL (type_decl); | |
3662 | DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t); | |
3663 | DECL_SOURCE_FILE (type_decl) | |
3664 | = DECL_SOURCE_FILE (TYPE_STUB_DECL (template_type)); | |
3665 | DECL_SOURCE_LINE (type_decl) | |
3666 | = DECL_SOURCE_LINE (TYPE_STUB_DECL (template_type)); | |
3667 | TYPE_STUB_DECL (t) = TYPE_NAME (t) = type_decl; | |
3668 | } | |
3669 | else | |
3670 | type_decl = TYPE_NAME (t); | |
36a117a5 | 3671 | |
9fbf56f7 MM |
3672 | /* Set up the template information. We have to figure out which |
3673 | template is the immediate parent if this is a full | |
3674 | instantiation. */ | |
3675 | if (parm_depth == 1 || is_partial_instantiation | |
3676 | || !PRIMARY_TEMPLATE_P (template)) | |
3677 | /* This case is easy; there are no member templates involved. */ | |
3678 | found = template; | |
3679 | else | |
3680 | { | |
3681 | /* This is a full instantiation of a member template. There | |
3682 | should be some partial instantiation of which this is an | |
3683 | instance. */ | |
3684 | ||
3685 | for (found = DECL_TEMPLATE_INSTANTIATIONS (template); | |
3686 | found; found = TREE_CHAIN (found)) | |
3687 | { | |
3688 | int success; | |
3689 | tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found)); | |
3690 | ||
3691 | /* We only want partial instantiations, here, not | |
3692 | specializations or full instantiations. */ | |
3693 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found)) | |
3694 | || !uses_template_parms (TREE_VALUE (found))) | |
3695 | continue; | |
3696 | ||
3697 | /* Temporarily reduce by one the number of levels in the | |
3698 | ARGLIST and in FOUND so as to avoid comparing the | |
3699 | last set of arguments. */ | |
3700 | TREE_VEC_LENGTH (arglist)--; | |
3701 | TREE_VEC_LENGTH (TREE_PURPOSE (found)) --; | |
3702 | ||
3703 | /* See if the arguments match. If they do, then TMPL is | |
3704 | the partial instantiation we want. */ | |
3705 | success = comp_template_args (TREE_PURPOSE (found), arglist); | |
3706 | ||
3707 | /* Restore the argument vectors to their full size. */ | |
3708 | TREE_VEC_LENGTH (arglist)++; | |
3709 | TREE_VEC_LENGTH (TREE_PURPOSE (found))++; | |
3710 | ||
3711 | if (success) | |
3712 | { | |
3713 | found = tmpl; | |
3714 | break; | |
3715 | } | |
3716 | } | |
3717 | ||
3718 | if (!found) | |
3719 | my_friendly_abort (0); | |
3720 | } | |
3721 | ||
5566b478 | 3722 | arglist = copy_to_permanent (arglist); |
ed44da02 | 3723 | SET_TYPE_TEMPLATE_INFO (t, |
9fbf56f7 | 3724 | tree_cons (found, arglist, NULL_TREE)); |
dbfe2124 MM |
3725 | DECL_TEMPLATE_INSTANTIATIONS (template) |
3726 | = tree_cons (arglist, t, | |
3727 | DECL_TEMPLATE_INSTANTIATIONS (template)); | |
3728 | ||
3729 | if (TREE_CODE (t) == ENUMERAL_TYPE | |
3730 | && !is_partial_instantiation) | |
61a127b3 MM |
3731 | /* Now that the type has been registered on the instantiations |
3732 | list, we set up the enumerators. Because the enumeration | |
3733 | constants may involve the enumeration type itself, we make | |
3734 | sure to register the type first, and then create the | |
3735 | constants. That way, doing tsubst_expr for the enumeration | |
3736 | constants won't result in recursive calls here; we'll find | |
3737 | the instantiation and exit above. */ | |
3738 | tsubst_enum (template_type, t, arglist); | |
dbfe2124 MM |
3739 | |
3740 | /* We're done with the permanent obstack, now. */ | |
3741 | pop_obstacks (); | |
7ddedda4 MM |
3742 | /* We're also done with the momentary allocation we started |
3743 | above. */ | |
3744 | pop_momentary (); | |
5566b478 | 3745 | |
36a117a5 MM |
3746 | /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO |
3747 | is set up. */ | |
ed44da02 MM |
3748 | if (TREE_CODE (t) != ENUMERAL_TYPE) |
3749 | DECL_NAME (type_decl) = classtype_mangled_name (t); | |
36a117a5 | 3750 | DECL_ASSEMBLER_NAME (type_decl) = DECL_NAME (type_decl); |
dbfe2124 | 3751 | if (!is_partial_instantiation) |
36a117a5 MM |
3752 | { |
3753 | DECL_ASSEMBLER_NAME (type_decl) | |
3754 | = get_identifier (build_overload_name (t, 1, 1)); | |
50a6dbd7 JM |
3755 | |
3756 | /* For backwards compatibility; code that uses | |
3757 | -fexternal-templates expects looking up a template to | |
3758 | instantiate it. I think DDD still relies on this. | |
3759 | (jason 8/20/1998) */ | |
ed44da02 MM |
3760 | if (TREE_CODE (t) != ENUMERAL_TYPE |
3761 | && flag_external_templates | |
36a117a5 MM |
3762 | && CLASSTYPE_INTERFACE_KNOWN (TREE_TYPE (template)) |
3763 | && ! CLASSTYPE_INTERFACE_ONLY (TREE_TYPE (template))) | |
3764 | add_pending_template (t); | |
3765 | } | |
3766 | else | |
077e7015 MM |
3767 | /* If the type makes use of template parameters, the |
3768 | code that generates debugging information will crash. */ | |
3769 | DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1; | |
8d08fdba | 3770 | |
36a117a5 MM |
3771 | return t; |
3772 | } | |
8d08fdba MS |
3773 | } |
3774 | \f | |
050367a3 MM |
3775 | /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM, or |
3776 | TEMPLATE_PARM_INDEX in T, call FN with the parameter and the DATA. | |
3777 | If FN returns non-zero, the iteration is terminated, and | |
3778 | for_each_template_parm returns 1. Otherwise, the iteration | |
3779 | continues. If FN never returns a non-zero value, the value | |
3780 | returned by for_each_template_parm is 0. If FN is NULL, it is | |
3781 | considered to be the function which always returns 1. */ | |
3782 | ||
8d08fdba | 3783 | int |
050367a3 | 3784 | for_each_template_parm (t, fn, data) |
8d08fdba | 3785 | tree t; |
050367a3 MM |
3786 | tree_fn_t fn; |
3787 | void* data; | |
8d08fdba MS |
3788 | { |
3789 | if (!t) | |
3790 | return 0; | |
581d38d0 MM |
3791 | |
3792 | if (TREE_CODE_CLASS (TREE_CODE (t)) == 't' | |
3793 | && for_each_template_parm (TYPE_CONTEXT (t), fn, data)) | |
3794 | return 1; | |
3795 | ||
8d08fdba MS |
3796 | switch (TREE_CODE (t)) |
3797 | { | |
3798 | case INDIRECT_REF: | |
3799 | case COMPONENT_REF: | |
3800 | /* We assume that the object must be instantiated in order to build | |
3801 | the COMPONENT_REF, so we test only whether the type of the | |
3802 | COMPONENT_REF uses template parms. */ | |
050367a3 | 3803 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
8d08fdba MS |
3804 | |
3805 | case IDENTIFIER_NODE: | |
3806 | if (!IDENTIFIER_TEMPLATE (t)) | |
3807 | return 0; | |
5566b478 | 3808 | my_friendly_abort (42); |
8d08fdba MS |
3809 | |
3810 | /* aggregates of tree nodes */ | |
3811 | case TREE_VEC: | |
3812 | { | |
3813 | int i = TREE_VEC_LENGTH (t); | |
3814 | while (i--) | |
050367a3 | 3815 | if (for_each_template_parm (TREE_VEC_ELT (t, i), fn, data)) |
8d08fdba MS |
3816 | return 1; |
3817 | return 0; | |
3818 | } | |
3819 | case TREE_LIST: | |
050367a3 MM |
3820 | if (for_each_template_parm (TREE_PURPOSE (t), fn, data) |
3821 | || for_each_template_parm (TREE_VALUE (t), fn, data)) | |
8d08fdba | 3822 | return 1; |
050367a3 | 3823 | return for_each_template_parm (TREE_CHAIN (t), fn, data); |
8d08fdba | 3824 | |
2c73f9f5 ML |
3825 | case OVERLOAD: |
3826 | if (for_each_template_parm (OVL_FUNCTION (t), fn, data)) | |
3827 | return 1; | |
3828 | return for_each_template_parm (OVL_CHAIN (t), fn, data); | |
3829 | ||
8d08fdba MS |
3830 | /* constructed type nodes */ |
3831 | case POINTER_TYPE: | |
3832 | case REFERENCE_TYPE: | |
050367a3 | 3833 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
ed44da02 | 3834 | |
8d08fdba | 3835 | case RECORD_TYPE: |
b7484fbe | 3836 | if (TYPE_PTRMEMFUNC_FLAG (t)) |
050367a3 MM |
3837 | return for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE (t), |
3838 | fn, data); | |
ed44da02 MM |
3839 | /* Fall through. */ |
3840 | ||
8d08fdba | 3841 | case UNION_TYPE: |
ed44da02 MM |
3842 | case ENUMERAL_TYPE: |
3843 | if (! TYPE_TEMPLATE_INFO (t)) | |
8d08fdba | 3844 | return 0; |
050367a3 | 3845 | return for_each_template_parm (TREE_VALUE |
ed44da02 | 3846 | (TYPE_TEMPLATE_INFO (t)), |
050367a3 | 3847 | fn, data); |
588c2d1c MM |
3848 | case METHOD_TYPE: |
3849 | if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data)) | |
8d08fdba | 3850 | return 1; |
588c2d1c MM |
3851 | /* Fall through. */ |
3852 | ||
3853 | case FUNCTION_TYPE: | |
3854 | /* Check the parameter types. Since default arguments are not | |
3855 | instantiated until they are needed, the TYPE_ARG_TYPES may | |
3856 | contain expressions that involve template parameters. But, | |
3857 | no-one should be looking at them yet. And, once they're | |
3858 | instantiated, they don't contain template parameters, so | |
3859 | there's no point in looking at them then, either. */ | |
3860 | { | |
3861 | tree parm; | |
3862 | ||
3863 | for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm)) | |
3864 | if (for_each_template_parm (TREE_VALUE (parm), fn, data)) | |
3865 | return 1; | |
3866 | } | |
3867 | ||
3868 | /* Check the return type, too. */ | |
050367a3 | 3869 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
588c2d1c | 3870 | |
8d08fdba | 3871 | case ARRAY_TYPE: |
050367a3 | 3872 | if (for_each_template_parm (TYPE_DOMAIN (t), fn, data)) |
8d08fdba | 3873 | return 1; |
050367a3 | 3874 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
8d08fdba | 3875 | case OFFSET_TYPE: |
050367a3 | 3876 | if (for_each_template_parm (TYPE_OFFSET_BASETYPE (t), fn, data)) |
8d08fdba | 3877 | return 1; |
050367a3 | 3878 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
8d08fdba MS |
3879 | |
3880 | /* decl nodes */ | |
3881 | case TYPE_DECL: | |
050367a3 | 3882 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
5566b478 | 3883 | |
73b0fce8 KL |
3884 | case TEMPLATE_DECL: |
3885 | /* A template template parameter is encountered */ | |
3886 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (t)) | |
744fac59 KL |
3887 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
3888 | /* Already substituted template template parameter */ | |
73b0fce8 KL |
3889 | return 0; |
3890 | ||
3ac3d9ea | 3891 | case CONST_DECL: |
050367a3 | 3892 | if (for_each_template_parm (DECL_INITIAL (t), fn, data)) |
3ac3d9ea MM |
3893 | return 1; |
3894 | goto check_type_and_context; | |
3895 | ||
8d08fdba | 3896 | case FUNCTION_DECL: |
5566b478 MS |
3897 | case VAR_DECL: |
3898 | /* ??? What about FIELD_DECLs? */ | |
3899 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t) | |
050367a3 | 3900 | && for_each_template_parm (DECL_TI_ARGS (t), fn, data)) |
8d08fdba MS |
3901 | return 1; |
3902 | /* fall through */ | |
8d08fdba | 3903 | case PARM_DECL: |
3ac3d9ea | 3904 | check_type_and_context: |
050367a3 | 3905 | if (for_each_template_parm (TREE_TYPE (t), fn, data)) |
5566b478 | 3906 | return 1; |
050367a3 MM |
3907 | if (DECL_CONTEXT (t) |
3908 | && for_each_template_parm (DECL_CONTEXT (t), fn, data)) | |
8d08fdba | 3909 | return 1; |
8d08fdba MS |
3910 | return 0; |
3911 | ||
3912 | case CALL_EXPR: | |
050367a3 | 3913 | return for_each_template_parm (TREE_TYPE (t), fn, data); |
8d08fdba | 3914 | case ADDR_EXPR: |
050367a3 | 3915 | return for_each_template_parm (TREE_OPERAND (t, 0), fn, data); |
8d08fdba MS |
3916 | |
3917 | /* template parm nodes */ | |
73b0fce8 | 3918 | case TEMPLATE_TEMPLATE_PARM: |
744fac59 | 3919 | /* Record template parameters such as `T' inside `TT<T>'. */ |
7ddedda4 MM |
3920 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t) |
3921 | && for_each_template_parm (TYPE_TI_ARGS (t), fn, data)) | |
744fac59 KL |
3922 | return 1; |
3923 | case TEMPLATE_TYPE_PARM: | |
f84b4be9 | 3924 | case TEMPLATE_PARM_INDEX: |
050367a3 MM |
3925 | if (fn) |
3926 | return (*fn)(t, data); | |
3927 | else | |
3928 | return 1; | |
8d08fdba MS |
3929 | |
3930 | /* simple type nodes */ | |
3931 | case INTEGER_TYPE: | |
050367a3 | 3932 | if (for_each_template_parm (TYPE_MIN_VALUE (t), fn, data)) |
8d08fdba | 3933 | return 1; |
050367a3 | 3934 | return for_each_template_parm (TYPE_MAX_VALUE (t), fn, data); |
8d08fdba MS |
3935 | |
3936 | case REAL_TYPE: | |
37c46b43 | 3937 | case COMPLEX_TYPE: |
8d08fdba | 3938 | case VOID_TYPE: |
2986ae00 | 3939 | case BOOLEAN_TYPE: |
2c73f9f5 | 3940 | case NAMESPACE_DECL: |
8d08fdba MS |
3941 | return 0; |
3942 | ||
3943 | /* constants */ | |
3944 | case INTEGER_CST: | |
3945 | case REAL_CST: | |
3946 | case STRING_CST: | |
3947 | return 0; | |
3948 | ||
3949 | case ERROR_MARK: | |
3950 | /* Non-error_mark_node ERROR_MARKs are bad things. */ | |
3951 | my_friendly_assert (t == error_mark_node, 274); | |
3952 | /* NOTREACHED */ | |
3953 | return 0; | |
3954 | ||
ec255269 | 3955 | case LOOKUP_EXPR: |
5566b478 | 3956 | case TYPENAME_TYPE: |
8d08fdba MS |
3957 | return 1; |
3958 | ||
61a127b3 MM |
3959 | case PTRMEM_CST: |
3960 | return for_each_template_parm (TREE_TYPE (t), fn, data); | |
3961 | ||
5156628f | 3962 | case SCOPE_REF: |
050367a3 | 3963 | return for_each_template_parm (TREE_OPERAND (t, 0), fn, data); |
5156628f | 3964 | |
db5ae43f MS |
3965 | case CONSTRUCTOR: |
3966 | if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t))) | |
050367a3 MM |
3967 | return for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE |
3968 | (TREE_TYPE (t)), fn, data); | |
3969 | return for_each_template_parm (TREE_OPERAND (t, 1), fn, data); | |
db5ae43f | 3970 | |
42976354 BK |
3971 | case MODOP_EXPR: |
3972 | case CAST_EXPR: | |
3973 | case REINTERPRET_CAST_EXPR: | |
3974 | case CONST_CAST_EXPR: | |
3975 | case STATIC_CAST_EXPR: | |
3976 | case DYNAMIC_CAST_EXPR: | |
42976354 BK |
3977 | case ARROW_EXPR: |
3978 | case DOTSTAR_EXPR: | |
3979 | case TYPEID_EXPR: | |
3980 | return 1; | |
3981 | ||
abff8e06 JM |
3982 | case SIZEOF_EXPR: |
3983 | case ALIGNOF_EXPR: | |
050367a3 | 3984 | return for_each_template_parm (TREE_OPERAND (t, 0), fn, data); |
abff8e06 | 3985 | |
8d08fdba MS |
3986 | default: |
3987 | switch (TREE_CODE_CLASS (TREE_CODE (t))) | |
3988 | { | |
3989 | case '1': | |
3990 | case '2': | |
ec255269 | 3991 | case 'e': |
8d08fdba MS |
3992 | case '<': |
3993 | { | |
3994 | int i; | |
bbc06b4b | 3995 | for (i = first_rtl_op (TREE_CODE (t)); --i >= 0;) |
050367a3 | 3996 | if (for_each_template_parm (TREE_OPERAND (t, i), fn, data)) |
8d08fdba MS |
3997 | return 1; |
3998 | return 0; | |
3999 | } | |
4000 | default: | |
4001 | break; | |
4002 | } | |
4003 | sorry ("testing %s for template parms", | |
4004 | tree_code_name [(int) TREE_CODE (t)]); | |
4005 | my_friendly_abort (82); | |
4006 | /* NOTREACHED */ | |
4007 | return 0; | |
4008 | } | |
4009 | } | |
4010 | ||
050367a3 MM |
4011 | int |
4012 | uses_template_parms (t) | |
4013 | tree t; | |
4014 | { | |
4015 | return for_each_template_parm (t, 0, 0); | |
4016 | } | |
4017 | ||
27fafc8d JM |
4018 | static struct tinst_level *current_tinst_level; |
4019 | static struct tinst_level *free_tinst_level; | |
4020 | static int tinst_depth; | |
e9f32eb5 | 4021 | extern int max_tinst_depth; |
5566b478 | 4022 | #ifdef GATHER_STATISTICS |
27fafc8d | 4023 | int depth_reached; |
5566b478 | 4024 | #endif |
27fafc8d JM |
4025 | int tinst_level_tick; |
4026 | int last_template_error_tick; | |
8d08fdba | 4027 | |
7bae46f4 | 4028 | /* Print out all the template instantiations that we are currently |
27fafc8d JM |
4029 | working on. If ERR, we are being called from cp_thing, so do |
4030 | the right thing for an error message. */ | |
7bae46f4 | 4031 | |
27fafc8d JM |
4032 | static void |
4033 | print_template_context (err) | |
4034 | int err; | |
7bae46f4 JM |
4035 | { |
4036 | struct tinst_level *p = current_tinst_level; | |
4037 | int line = lineno; | |
4038 | char *file = input_filename; | |
4039 | ||
49e04385 | 4040 | if (err && p) |
27fafc8d | 4041 | { |
49e04385 MM |
4042 | if (current_function_decl != p->decl |
4043 | && current_function_decl != NULL_TREE) | |
4044 | /* We can get here during the processing of some synthesized | |
4045 | method. Then, p->decl will be the function that's causing | |
4046 | the synthesis. */ | |
4047 | ; | |
27fafc8d | 4048 | else |
27fafc8d | 4049 | { |
49e04385 MM |
4050 | if (current_function_decl == p->decl) |
4051 | /* Avoid redundancy with the the "In function" line. */; | |
4052 | else | |
4053 | fprintf (stderr, "%s: In instantiation of `%s':\n", | |
4054 | file, decl_as_string (p->decl, 0)); | |
4055 | ||
038fb86f JM |
4056 | line = p->line; |
4057 | file = p->file; | |
27fafc8d JM |
4058 | p = p->next; |
4059 | } | |
4060 | } | |
4061 | ||
7bae46f4 JM |
4062 | for (; p; p = p->next) |
4063 | { | |
038fb86f JM |
4064 | fprintf (stderr, "%s:%d: instantiated from `%s'\n", file, line, |
4065 | decl_as_string (p->decl, 0)); | |
4066 | line = p->line; | |
4067 | file = p->file; | |
7bae46f4 | 4068 | } |
038fb86f | 4069 | fprintf (stderr, "%s:%d: instantiated from here\n", file, line); |
7bae46f4 JM |
4070 | } |
4071 | ||
27fafc8d JM |
4072 | /* Called from cp_thing to print the template context for an error. */ |
4073 | ||
4074 | void | |
4075 | maybe_print_template_context () | |
4076 | { | |
4077 | if (last_template_error_tick == tinst_level_tick | |
4078 | || current_tinst_level == 0) | |
4079 | return; | |
4080 | ||
4081 | last_template_error_tick = tinst_level_tick; | |
4082 | print_template_context (1); | |
4083 | } | |
4084 | ||
bd6dd845 | 4085 | static int |
5566b478 MS |
4086 | push_tinst_level (d) |
4087 | tree d; | |
8d08fdba MS |
4088 | { |
4089 | struct tinst_level *new; | |
8d08fdba | 4090 | |
7215f9a0 MS |
4091 | if (tinst_depth >= max_tinst_depth) |
4092 | { | |
8adf5b5e JM |
4093 | /* If the instantiation in question still has unbound template parms, |
4094 | we don't really care if we can't instantiate it, so just return. | |
4095 | This happens with base instantiation for implicit `typename'. */ | |
4096 | if (uses_template_parms (d)) | |
4097 | return 0; | |
4098 | ||
1139b3d8 | 4099 | last_template_error_tick = tinst_level_tick; |
8251199e | 4100 | error ("template instantiation depth exceeds maximum of %d", |
7215f9a0 | 4101 | max_tinst_depth); |
8251199e JM |
4102 | error (" (use -ftemplate-depth-NN to increase the maximum)"); |
4103 | cp_error (" instantiating `%D'", d); | |
5566b478 | 4104 | |
27fafc8d | 4105 | print_template_context (0); |
5566b478 | 4106 | |
7215f9a0 MS |
4107 | return 0; |
4108 | } | |
4109 | ||
8d08fdba MS |
4110 | if (free_tinst_level) |
4111 | { | |
4112 | new = free_tinst_level; | |
4113 | free_tinst_level = new->next; | |
4114 | } | |
4115 | else | |
4116 | new = (struct tinst_level *) xmalloc (sizeof (struct tinst_level)); | |
4117 | ||
5566b478 MS |
4118 | new->decl = d; |
4119 | new->line = lineno; | |
4120 | new->file = input_filename; | |
8d08fdba MS |
4121 | new->next = current_tinst_level; |
4122 | current_tinst_level = new; | |
5566b478 | 4123 | |
7215f9a0 | 4124 | ++tinst_depth; |
5566b478 MS |
4125 | #ifdef GATHER_STATISTICS |
4126 | if (tinst_depth > depth_reached) | |
4127 | depth_reached = tinst_depth; | |
4128 | #endif | |
4129 | ||
27fafc8d | 4130 | ++tinst_level_tick; |
7215f9a0 | 4131 | return 1; |
8d08fdba MS |
4132 | } |
4133 | ||
4134 | void | |
4135 | pop_tinst_level () | |
4136 | { | |
4137 | struct tinst_level *old = current_tinst_level; | |
4138 | ||
ae58fa02 MM |
4139 | /* Restore the filename and line number stashed away when we started |
4140 | this instantiation. */ | |
4141 | lineno = old->line; | |
4142 | input_filename = old->file; | |
5f2c99c4 | 4143 | extract_interface_info (); |
ae58fa02 | 4144 | |
8d08fdba MS |
4145 | current_tinst_level = old->next; |
4146 | old->next = free_tinst_level; | |
4147 | free_tinst_level = old; | |
7215f9a0 | 4148 | --tinst_depth; |
27fafc8d | 4149 | ++tinst_level_tick; |
8d08fdba MS |
4150 | } |
4151 | ||
4152 | struct tinst_level * | |
4153 | tinst_for_decl () | |
4154 | { | |
4155 | struct tinst_level *p = current_tinst_level; | |
4156 | ||
4157 | if (p) | |
4158 | for (; p->next ; p = p->next ) | |
4159 | ; | |
4160 | return p; | |
4161 | } | |
4162 | ||
f84b4be9 JM |
4163 | /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the |
4164 | vector of template arguments, as for tsubst. | |
4165 | ||
4166 | Returns an appropriate tsbust'd friend declaration. */ | |
4167 | ||
4168 | static tree | |
4169 | tsubst_friend_function (decl, args) | |
4170 | tree decl; | |
4171 | tree args; | |
4172 | { | |
4173 | tree new_friend; | |
27fafc8d JM |
4174 | int line = lineno; |
4175 | char *file = input_filename; | |
4176 | ||
4177 | lineno = DECL_SOURCE_LINE (decl); | |
4178 | input_filename = DECL_SOURCE_FILE (decl); | |
4179 | ||
f84b4be9 JM |
4180 | if (TREE_CODE (decl) == FUNCTION_DECL |
4181 | && DECL_TEMPLATE_INSTANTIATION (decl) | |
4182 | && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL) | |
4183 | /* This was a friend declared with an explicit template | |
4184 | argument list, e.g.: | |
4185 | ||
4186 | friend void f<>(T); | |
4187 | ||
4188 | to indicate that f was a template instantiation, not a new | |
4189 | function declaration. Now, we have to figure out what | |
4190 | instantiation of what template. */ | |
4191 | { | |
4192 | tree template_id; | |
4193 | tree new_args; | |
4194 | tree tmpl; | |
f84b4be9 JM |
4195 | |
4196 | template_id | |
4197 | = lookup_template_function (tsubst_expr (DECL_TI_TEMPLATE (decl), | |
f7d98d58 | 4198 | args, NULL_TREE), |
f84b4be9 | 4199 | tsubst (DECL_TI_ARGS (decl), |
f7d98d58 | 4200 | args, NULL_TREE)); |
39c01e4c MM |
4201 | /* FIXME: The decl we create via the next tsubst could be |
4202 | created on a temporary obstack. */ | |
f7d98d58 | 4203 | new_friend = tsubst (decl, args, NULL_TREE); |
36a117a5 MM |
4204 | tmpl = determine_specialization (template_id, new_friend, |
4205 | &new_args, | |
4206 | /*need_member_template=*/0, | |
4207 | /*complain=*/1); | |
27fafc8d JM |
4208 | new_friend = instantiate_template (tmpl, new_args); |
4209 | goto done; | |
f84b4be9 | 4210 | } |
36a117a5 MM |
4211 | |
4212 | new_friend = tsubst (decl, args, NULL_TREE); | |
f84b4be9 | 4213 | |
36a117a5 | 4214 | /* The NEW_FRIEND will look like an instantiation, to the |
f84b4be9 JM |
4215 | compiler, but is not an instantiation from the point of view of |
4216 | the language. For example, we might have had: | |
4217 | ||
4218 | template <class T> struct S { | |
4219 | template <class U> friend void f(T, U); | |
4220 | }; | |
4221 | ||
4222 | Then, in S<int>, template <class U> void f(int, U) is not an | |
4223 | instantiation of anything. */ | |
4224 | DECL_USE_TEMPLATE (new_friend) = 0; | |
4225 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
4226 | DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0; | |
36a117a5 MM |
4227 | |
4228 | /* The mangled name for the NEW_FRIEND is incorrect. The call to | |
4229 | tsubst will have resulted in a call to | |
4230 | set_mangled_name_for_template_decl. But, the function is not a | |
4231 | template instantiation and should not be mangled like one. | |
4232 | Therefore, we remangle the function name. We don't have to do | |
4233 | this if the NEW_FRIEND is a template since | |
4234 | set_mangled_name_for_template_decl doesn't do anything if the | |
4235 | function declaration still uses template arguments. */ | |
4236 | if (TREE_CODE (new_friend) != TEMPLATE_DECL) | |
4237 | { | |
4238 | set_mangled_name_for_decl (new_friend); | |
4239 | DECL_RTL (new_friend) = 0; | |
4240 | make_decl_rtl (new_friend, NULL_PTR, 1); | |
4241 | } | |
4242 | ||
6eb3bb27 | 4243 | if (DECL_NAMESPACE_SCOPE_P (new_friend)) |
f84b4be9 | 4244 | { |
36a117a5 | 4245 | tree old_decl; |
fbf1c34b MM |
4246 | tree new_friend_template_info; |
4247 | tree new_friend_result_template_info; | |
4248 | int new_friend_is_defn; | |
4249 | ||
4250 | /* We must save some information from NEW_FRIEND before calling | |
4251 | duplicate decls since that function will free NEW_FRIEND if | |
4252 | possible. */ | |
4253 | new_friend_template_info = DECL_TEMPLATE_INFO (new_friend); | |
f84b4be9 | 4254 | if (TREE_CODE (new_friend) == TEMPLATE_DECL) |
fbf1c34b MM |
4255 | { |
4256 | /* This declaration is a `primary' template. */ | |
4257 | DECL_PRIMARY_TEMPLATE (new_friend) = new_friend; | |
4258 | ||
4259 | new_friend_is_defn | |
4260 | = DECL_INITIAL (DECL_RESULT (new_friend)) != NULL_TREE; | |
4261 | new_friend_result_template_info | |
4262 | = DECL_TEMPLATE_INFO (DECL_RESULT (new_friend)); | |
4263 | } | |
4264 | else | |
4265 | { | |
4266 | new_friend_is_defn = DECL_INITIAL (new_friend) != NULL_TREE; | |
4267 | new_friend_result_template_info = NULL_TREE; | |
4268 | } | |
36a117a5 | 4269 | |
36a117a5 MM |
4270 | old_decl = pushdecl_namespace_level (new_friend); |
4271 | ||
4272 | if (old_decl != new_friend) | |
4273 | { | |
4274 | /* This new friend declaration matched an existing | |
4275 | declaration. For example, given: | |
4276 | ||
4277 | template <class T> void f(T); | |
4278 | template <class U> class C { | |
4279 | template <class T> friend void f(T) {} | |
4280 | }; | |
4281 | ||
4282 | the friend declaration actually provides the definition | |
4283 | of `f', once C has been instantiated for some type. So, | |
4284 | old_decl will be the out-of-class template declaration, | |
4285 | while new_friend is the in-class definition. | |
4286 | ||
4287 | But, if `f' was called before this point, the | |
4288 | instantiation of `f' will have DECL_TI_ARGS corresponding | |
4289 | to `T' but not to `U', references to which might appear | |
4290 | in the definition of `f'. Previously, the most general | |
4291 | template for an instantiation of `f' was the out-of-class | |
4292 | version; now it is the in-class version. Therefore, we | |
4293 | run through all specialization of `f', adding to their | |
4294 | DECL_TI_ARGS appropriately. In particular, they need a | |
4295 | new set of outer arguments, corresponding to the | |
4296 | arguments for this class instantiation. | |
4297 | ||
4298 | The same situation can arise with something like this: | |
4299 | ||
4300 | friend void f(int); | |
4301 | template <class T> class C { | |
4302 | friend void f(T) {} | |
4303 | }; | |
4304 | ||
4305 | when `C<int>' is instantiated. Now, `f(int)' is defined | |
4306 | in the class. */ | |
4307 | ||
fbf1c34b MM |
4308 | if (!new_friend_is_defn) |
4309 | /* On the other hand, if the in-class declaration does | |
4310 | *not* provide a definition, then we don't want to alter | |
4311 | existing definitions. We can just leave everything | |
4312 | alone. */ | |
36a117a5 | 4313 | ; |
fbf1c34b | 4314 | else |
36a117a5 | 4315 | { |
fbf1c34b MM |
4316 | /* Overwrite whatever template info was there before, if |
4317 | any, with the new template information pertaining to | |
4318 | the declaration. */ | |
4319 | DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info; | |
4320 | ||
4321 | if (TREE_CODE (old_decl) != TEMPLATE_DECL) | |
4322 | /* duplicate_decls will take care of this case. */ | |
4323 | ; | |
4324 | else | |
36a117a5 | 4325 | { |
fbf1c34b MM |
4326 | tree t; |
4327 | tree new_friend_args; | |
4328 | ||
4329 | DECL_TEMPLATE_INFO (DECL_RESULT (old_decl)) | |
4330 | = new_friend_result_template_info; | |
4331 | ||
4332 | new_friend_args = TI_ARGS (new_friend_template_info); | |
4333 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl); | |
4334 | t != NULL_TREE; | |
4335 | t = TREE_CHAIN (t)) | |
4336 | { | |
4337 | tree spec = TREE_VALUE (t); | |
36a117a5 | 4338 | |
fbf1c34b MM |
4339 | DECL_TI_ARGS (spec) |
4340 | = add_outermost_template_args (new_friend_args, | |
4341 | DECL_TI_ARGS (spec)); | |
4342 | DECL_TI_ARGS (spec) | |
4343 | = copy_to_permanent (DECL_TI_ARGS (spec)); | |
4344 | } | |
4345 | ||
4346 | /* Now, since specializations are always supposed to | |
4347 | hang off of the most general template, we must move | |
4348 | them. */ | |
4349 | t = most_general_template (old_decl); | |
4350 | if (t != old_decl) | |
4351 | { | |
4352 | DECL_TEMPLATE_SPECIALIZATIONS (t) | |
4353 | = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t), | |
4354 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl)); | |
4355 | DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE; | |
4356 | } | |
36a117a5 MM |
4357 | } |
4358 | } | |
4359 | ||
4360 | /* The information from NEW_FRIEND has been merged into OLD_DECL | |
4361 | by duplicate_decls. */ | |
4362 | new_friend = old_decl; | |
4363 | } | |
f84b4be9 JM |
4364 | } |
4365 | else if (TYPE_SIZE (DECL_CONTEXT (new_friend))) | |
4366 | { | |
4367 | /* Check to see that the declaration is really present, and, | |
4368 | possibly obtain an improved declaration. */ | |
4369 | tree fn = check_classfn (DECL_CONTEXT (new_friend), | |
4370 | new_friend); | |
4371 | ||
4372 | if (fn) | |
4373 | new_friend = fn; | |
4374 | } | |
4375 | ||
27fafc8d JM |
4376 | done: |
4377 | lineno = line; | |
4378 | input_filename = file; | |
f84b4be9 JM |
4379 | return new_friend; |
4380 | } | |
4381 | ||
1aed5355 MM |
4382 | /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of |
4383 | template arguments, as for tsubst. | |
6757edfe MM |
4384 | |
4385 | Returns an appropriate tsbust'd friend type. */ | |
4386 | ||
4387 | static tree | |
1aed5355 MM |
4388 | tsubst_friend_class (friend_tmpl, args) |
4389 | tree friend_tmpl; | |
6757edfe MM |
4390 | tree args; |
4391 | { | |
1aed5355 | 4392 | tree friend_type; |
f9c3243c | 4393 | tree tmpl = lookup_name (DECL_NAME (friend_tmpl), 1); |
6757edfe MM |
4394 | |
4395 | tmpl = maybe_get_template_decl_from_type_decl (tmpl); | |
4396 | ||
4397 | if (tmpl != NULL_TREE && DECL_CLASS_TEMPLATE_P (tmpl)) | |
4398 | { | |
4399 | /* The friend template has already been declared. Just | |
36a117a5 MM |
4400 | check to see that the declarations match, and install any new |
4401 | default parameters. We must tsubst the default parameters, | |
4402 | of course. We only need the innermost template parameters | |
4403 | because that is all that redeclare_class_template will look | |
4404 | at. */ | |
4405 | tree parms | |
4406 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl), | |
4407 | args); | |
4408 | redeclare_class_template (TREE_TYPE (tmpl), parms); | |
6757edfe MM |
4409 | friend_type = TREE_TYPE (tmpl); |
4410 | } | |
4411 | else | |
4412 | { | |
4413 | /* The friend template has not already been declared. In this | |
4414 | case, the instantiation of the template class will cause the | |
4415 | injection of this template into the global scope. */ | |
f9c3243c | 4416 | tmpl = tsubst (friend_tmpl, args, NULL_TREE); |
6757edfe MM |
4417 | |
4418 | /* The new TMPL is not an instantiation of anything, so we | |
4419 | forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for | |
4420 | the new type because that is supposed to be the corresponding | |
4421 | template decl, i.e., TMPL. */ | |
4422 | DECL_USE_TEMPLATE (tmpl) = 0; | |
4423 | DECL_TEMPLATE_INFO (tmpl) = NULL_TREE; | |
4424 | CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0; | |
4425 | ||
4426 | /* Inject this template into the global scope. */ | |
4427 | friend_type = TREE_TYPE (pushdecl_top_level (tmpl)); | |
4428 | } | |
4429 | ||
4430 | return friend_type; | |
4431 | } | |
f84b4be9 | 4432 | |
8d08fdba | 4433 | tree |
5566b478 MS |
4434 | instantiate_class_template (type) |
4435 | tree type; | |
8d08fdba | 4436 | { |
61a127b3 | 4437 | tree template, args, pattern, t; |
36a117a5 | 4438 | tree typedecl; |
8d08fdba | 4439 | |
5566b478 | 4440 | if (type == error_mark_node) |
8d08fdba MS |
4441 | return error_mark_node; |
4442 | ||
5566b478 MS |
4443 | if (TYPE_BEING_DEFINED (type) || TYPE_SIZE (type)) |
4444 | return type; | |
4445 | ||
7ddedda4 MM |
4446 | /* We want to allocate temporary vectors of template arguments and |
4447 | template argument expressions on the momentary obstack, not on | |
4448 | the expression obstack. Otherwise, all the space allocated in | |
4449 | argument coercion and such is simply lost. */ | |
4450 | push_momentary (); | |
4451 | ||
6bdb985f | 4452 | /* Figure out which template is being instantiated. */ |
36a117a5 | 4453 | template = most_general_template (CLASSTYPE_TI_TEMPLATE (type)); |
5566b478 | 4454 | my_friendly_assert (TREE_CODE (template) == TEMPLATE_DECL, 279); |
73aad9b9 | 4455 | |
6bdb985f MM |
4456 | /* Figure out which arguments are being used to do the |
4457 | instantiation. */ | |
4458 | args = CLASSTYPE_TI_ARGS (type); | |
4c571114 | 4459 | PARTIAL_INSTANTIATION_P (type) = uses_template_parms (args); |
6bdb985f | 4460 | |
4c571114 MM |
4461 | if (pedantic && PARTIAL_INSTANTIATION_P (type)) |
4462 | /* If this is a partial instantiation, then we can't instantiate | |
4463 | the type; there's no telling whether or not one of the | |
4464 | template parameters might eventually be instantiated to some | |
4465 | value that results in a specialization being used. For | |
4466 | example, consider: | |
4467 | ||
4468 | template <class T> | |
4469 | struct S {}; | |
4470 | ||
4471 | template <class U> | |
4472 | void f(S<U>); | |
4473 | ||
4474 | template <> | |
4475 | struct S<int> {}; | |
4476 | ||
4477 | Now, the `S<U>' in `f<int>' is the specialization, not an | |
5db698f6 | 4478 | instantiation of the original template. */ |
4c571114 MM |
4479 | goto end; |
4480 | ||
4481 | /* Determine what specialization of the original template to | |
4482 | instantiate. */ | |
4483 | if (PARTIAL_INSTANTIATION_P (type)) | |
6bdb985f MM |
4484 | /* There's no telling which specialization is appropriate at this |
4485 | point. Since all peeking at the innards of this partial | |
4486 | instantiation are extensions (like the "implicit typename" | |
4487 | extension, which allows users to omit the keyword `typename' on | |
4488 | names that are declared as types in template base classes), we | |
4489 | are free to do what we please. | |
4490 | ||
4491 | Trying to figure out which partial instantiation to use can | |
4492 | cause a crash. (Some of the template arguments don't even have | |
4493 | types.) So, we just use the most general version. */ | |
4494 | t = NULL_TREE; | |
4495 | else | |
73aad9b9 | 4496 | { |
6bdb985f MM |
4497 | t = most_specialized_class (template, args); |
4498 | ||
4499 | if (t == error_mark_node) | |
73aad9b9 | 4500 | { |
6bdb985f MM |
4501 | char *str = "candidates are:"; |
4502 | cp_error ("ambiguous class template instantiation for `%#T'", type); | |
4503 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t; | |
4504 | t = TREE_CHAIN (t)) | |
73aad9b9 | 4505 | { |
6bdb985f MM |
4506 | if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), |
4507 | args)) | |
4508 | { | |
4509 | cp_error_at ("%s %+#T", str, TREE_TYPE (t)); | |
4510 | str = " "; | |
4511 | } | |
73aad9b9 | 4512 | } |
6bdb985f MM |
4513 | TYPE_BEING_DEFINED (type) = 1; |
4514 | type = error_mark_node; | |
4515 | goto end; | |
73aad9b9 | 4516 | } |
73aad9b9 | 4517 | } |
6bdb985f MM |
4518 | |
4519 | if (t) | |
73aad9b9 JM |
4520 | pattern = TREE_TYPE (t); |
4521 | else | |
4522 | pattern = TREE_TYPE (template); | |
5566b478 | 4523 | |
4c571114 MM |
4524 | /* If the template we're instantiating is incomplete, then clearly |
4525 | there's nothing we can do. */ | |
5566b478 | 4526 | if (TYPE_SIZE (pattern) == NULL_TREE) |
7ddedda4 | 4527 | goto end; |
5566b478 | 4528 | |
4c571114 MM |
4529 | /* If this is a partial instantiation, don't tsubst anything. We will |
4530 | only use this type for implicit typename, so the actual contents don't | |
4531 | matter. All that matters is whether a particular name is a type. */ | |
4532 | if (PARTIAL_INSTANTIATION_P (type)) | |
4533 | { | |
4534 | /* The fields set here must be kept in sync with those cleared | |
4535 | in begin_class_definition. */ | |
4536 | TYPE_BINFO_BASETYPES (type) = TYPE_BINFO_BASETYPES (pattern); | |
4537 | TYPE_FIELDS (type) = TYPE_FIELDS (pattern); | |
4538 | TYPE_METHODS (type) = TYPE_METHODS (pattern); | |
4539 | CLASSTYPE_TAGS (type) = CLASSTYPE_TAGS (pattern); | |
4540 | /* Pretend that the type is complete, so that we will look | |
4541 | inside it during name lookup and such. */ | |
4542 | TYPE_SIZE (type) = integer_zero_node; | |
4543 | goto end; | |
4544 | } | |
4545 | ||
4546 | /* If we've recursively instantiated too many templates, stop. */ | |
4547 | if (! push_tinst_level (type)) | |
4548 | goto end; | |
4549 | ||
4550 | /* Now we're really doing the instantiation. Mark the type as in | |
4551 | the process of being defined. */ | |
4552 | TYPE_BEING_DEFINED (type) = 1; | |
4553 | ||
4554 | maybe_push_to_top_level (uses_template_parms (type)); | |
4555 | pushclass (type, 0); | |
4556 | ||
73aad9b9 | 4557 | if (t) |
36a117a5 MM |
4558 | { |
4559 | /* This TYPE is actually a instantiation of of a partial | |
4560 | specialization. We replace the innermost set of ARGS with | |
4561 | the arguments appropriate for substitution. For example, | |
4562 | given: | |
4563 | ||
4564 | template <class T> struct S {}; | |
4565 | template <class T> struct S<T*> {}; | |
4566 | ||
4567 | and supposing that we are instantiating S<int*>, ARGS will | |
4568 | present be {int*} but we need {int}. */ | |
4569 | tree inner_args | |
4570 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), | |
4571 | args); | |
4572 | ||
4573 | /* If there were multiple levels in ARGS, replacing the | |
4574 | innermost level would alter CLASSTYPE_TI_ARGS, which we don't | |
4575 | want, so we make a copy first. */ | |
4576 | if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args)) | |
4577 | { | |
4578 | args = copy_node (args); | |
4579 | SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args); | |
4580 | } | |
4581 | else | |
4582 | args = inner_args; | |
4583 | } | |
8d019cef | 4584 | |
5566b478 MS |
4585 | if (flag_external_templates) |
4586 | { | |
4587 | if (flag_alt_external_templates) | |
4588 | { | |
4589 | CLASSTYPE_INTERFACE_ONLY (type) = interface_only; | |
4590 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X (type, interface_unknown); | |
4591 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4592 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4593 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4594 | } |
4595 | else | |
4596 | { | |
4597 | CLASSTYPE_INTERFACE_ONLY (type) = CLASSTYPE_INTERFACE_ONLY (pattern); | |
4598 | SET_CLASSTYPE_INTERFACE_UNKNOWN_X | |
4599 | (type, CLASSTYPE_INTERFACE_UNKNOWN (pattern)); | |
4600 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) | |
2604412d JM |
4601 | = (! CLASSTYPE_INTERFACE_ONLY (type) |
4602 | && CLASSTYPE_INTERFACE_KNOWN (type)); | |
5566b478 MS |
4603 | } |
4604 | } | |
4605 | else | |
8d08fdba | 4606 | { |
5566b478 MS |
4607 | SET_CLASSTYPE_INTERFACE_UNKNOWN (type); |
4608 | CLASSTYPE_VTABLE_NEEDS_WRITING (type) = 1; | |
8d08fdba MS |
4609 | } |
4610 | ||
f7da6097 MS |
4611 | TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern); |
4612 | TYPE_HAS_DESTRUCTOR (type) = TYPE_HAS_DESTRUCTOR (pattern); | |
4613 | TYPE_HAS_ASSIGNMENT (type) = TYPE_HAS_ASSIGNMENT (pattern); | |
4614 | TYPE_OVERLOADS_CALL_EXPR (type) = TYPE_OVERLOADS_CALL_EXPR (pattern); | |
4615 | TYPE_OVERLOADS_ARRAY_REF (type) = TYPE_OVERLOADS_ARRAY_REF (pattern); | |
4616 | TYPE_OVERLOADS_ARROW (type) = TYPE_OVERLOADS_ARROW (pattern); | |
4617 | TYPE_GETS_NEW (type) = TYPE_GETS_NEW (pattern); | |
4618 | TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern); | |
4619 | TYPE_VEC_DELETE_TAKES_SIZE (type) = TYPE_VEC_DELETE_TAKES_SIZE (pattern); | |
4620 | TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern); | |
4621 | TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern); | |
4622 | TYPE_HAS_ABSTRACT_ASSIGN_REF (type) = TYPE_HAS_ABSTRACT_ASSIGN_REF (pattern); | |
4623 | TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern); | |
4624 | TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern); | |
f7da6097 MS |
4625 | TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern); |
4626 | TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern); | |
4627 | TYPE_USES_COMPLEX_INHERITANCE (type) | |
4628 | = TYPE_USES_COMPLEX_INHERITANCE (pattern); | |
4629 | TYPE_USES_MULTIPLE_INHERITANCE (type) | |
4630 | = TYPE_USES_MULTIPLE_INHERITANCE (pattern); | |
4631 | TYPE_USES_VIRTUAL_BASECLASSES (type) | |
4632 | = TYPE_USES_VIRTUAL_BASECLASSES (pattern); | |
4633 | TYPE_PACKED (type) = TYPE_PACKED (pattern); | |
4634 | TYPE_ALIGN (type) = TYPE_ALIGN (pattern); | |
eff71ab0 | 4635 | TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */ |
f7da6097 | 4636 | |
4c571114 MM |
4637 | /* We must copy the arguments to the permanent obstack since |
4638 | during the tsubst'ing below they may wind up in the | |
4639 | DECL_TI_ARGS of some instantiated member template. */ | |
4640 | args = copy_to_permanent (args); | |
2604412d | 4641 | |
5566b478 MS |
4642 | { |
4643 | tree binfo = TYPE_BINFO (type); | |
4644 | tree pbases = TYPE_BINFO_BASETYPES (pattern); | |
4645 | ||
4646 | if (pbases) | |
4647 | { | |
4648 | tree bases; | |
4649 | int i; | |
4650 | int len = TREE_VEC_LENGTH (pbases); | |
de22184b | 4651 | bases = make_tree_vec (len); |
5566b478 MS |
4652 | for (i = 0; i < len; ++i) |
4653 | { | |
711734a9 | 4654 | tree elt, basetype; |
5566b478 MS |
4655 | |
4656 | TREE_VEC_ELT (bases, i) = elt | |
f7d98d58 | 4657 | = tsubst (TREE_VEC_ELT (pbases, i), args, NULL_TREE); |
5566b478 MS |
4658 | BINFO_INHERITANCE_CHAIN (elt) = binfo; |
4659 | ||
711734a9 JM |
4660 | basetype = TREE_TYPE (elt); |
4661 | ||
4662 | if (! IS_AGGR_TYPE (basetype)) | |
8251199e JM |
4663 | cp_error |
4664 | ("base type `%T' of `%T' fails to be a struct or class type", | |
711734a9 JM |
4665 | basetype, type); |
4666 | else if (TYPE_SIZE (complete_type (basetype)) == NULL_TREE) | |
8251199e | 4667 | cp_error ("base class `%T' of `%T' has incomplete type", |
711734a9 JM |
4668 | basetype, type); |
4669 | ||
4670 | /* These are set up in xref_basetypes for normal classes, so | |
4671 | we have to handle them here for template bases. */ | |
dfbcd65a JM |
4672 | |
4673 | unshare_base_binfos (elt); | |
4674 | ||
711734a9 JM |
4675 | if (TYPE_USES_VIRTUAL_BASECLASSES (basetype)) |
4676 | { | |
4677 | TYPE_USES_VIRTUAL_BASECLASSES (type) = 1; | |
4678 | TYPE_USES_COMPLEX_INHERITANCE (type) = 1; | |
4679 | } | |
4680 | TYPE_GETS_NEW (type) |= TYPE_GETS_NEW (basetype); | |
4681 | TYPE_GETS_DELETE (type) |= TYPE_GETS_DELETE (basetype); | |
5566b478 | 4682 | } |
de22184b MS |
4683 | /* Don't initialize this until the vector is filled out, or |
4684 | lookups will crash. */ | |
4685 | BINFO_BASETYPES (binfo) = bases; | |
5566b478 MS |
4686 | } |
4687 | } | |
4688 | ||
5566b478 | 4689 | for (t = CLASSTYPE_TAGS (pattern); t; t = TREE_CHAIN (t)) |
8d08fdba | 4690 | { |
5566b478 | 4691 | tree tag = TREE_VALUE (t); |
36a117a5 MM |
4692 | tree name = TYPE_IDENTIFIER (tag); |
4693 | tree newtag; | |
5566b478 | 4694 | |
ed44da02 | 4695 | newtag = tsubst (tag, args, NULL_TREE); |
61a127b3 | 4696 | if (TREE_CODE (newtag) != ENUMERAL_TYPE) |
ed44da02 | 4697 | { |
486e4077 MM |
4698 | if (TYPE_LANG_SPECIFIC (tag) && CLASSTYPE_IS_TEMPLATE (tag)) |
4699 | /* Unfortunately, lookup_template_class sets | |
4700 | CLASSTYPE_IMPLICIT_INSTANTIATION for a partial | |
4701 | instantiation (i.e., for the type of a member template | |
4702 | class nested within a template class.) This behavior is | |
4703 | required for maybe_process_partial_specialization to work | |
4704 | correctly, but is not accurate in this case; the TAG is not | |
4705 | an instantiation of anything. (The corresponding | |
4706 | TEMPLATE_DECL is an instantiation, but the TYPE is not.) */ | |
4707 | CLASSTYPE_USE_TEMPLATE (newtag) = 0; | |
4708 | ||
ed44da02 MM |
4709 | /* Now, we call pushtag to put this NEWTAG into the scope of |
4710 | TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid | |
4711 | pushtag calling push_template_decl. We don't have to do | |
4712 | this for enums because it will already have been done in | |
4713 | tsubst_enum. */ | |
4714 | if (name) | |
4715 | SET_IDENTIFIER_TYPE_VALUE (name, newtag); | |
4716 | pushtag (name, newtag, /*globalize=*/0); | |
4717 | } | |
8d08fdba MS |
4718 | } |
4719 | ||
5566b478 MS |
4720 | /* Don't replace enum constants here. */ |
4721 | for (t = TYPE_FIELDS (pattern); t; t = TREE_CHAIN (t)) | |
4722 | if (TREE_CODE (t) != CONST_DECL) | |
4723 | { | |
ae58fa02 MM |
4724 | tree r; |
4725 | ||
4726 | /* The the file and line for this declaration, to assist in | |
4727 | error message reporting. Since we called push_tinst_level | |
4728 | above, we don't need to restore these. */ | |
4729 | lineno = DECL_SOURCE_LINE (t); | |
4730 | input_filename = DECL_SOURCE_FILE (t); | |
4731 | ||
4732 | r = tsubst (t, args, NULL_TREE); | |
5566b478 MS |
4733 | if (TREE_CODE (r) == VAR_DECL) |
4734 | { | |
2604412d JM |
4735 | pending_statics = perm_tree_cons (NULL_TREE, r, pending_statics); |
4736 | /* Perhaps we should do more of grokfield here. */ | |
5566b478 MS |
4737 | start_decl_1 (r); |
4738 | DECL_IN_AGGR_P (r) = 1; | |
4739 | DECL_EXTERNAL (r) = 1; | |
4740 | cp_finish_decl (r, DECL_INITIAL (r), NULL_TREE, 0, 0); | |
6ba89f8e MM |
4741 | if (DECL_DEFINED_IN_CLASS_P (r)) |
4742 | check_static_variable_definition (r, TREE_TYPE (r)); | |
5566b478 | 4743 | } |
61a127b3 MM |
4744 | |
4745 | /* R will have a TREE_CHAIN if and only if it has already been | |
4746 | processed by finish_member_declaration. This can happen | |
4747 | if, for example, it is a TYPE_DECL for a class-scoped | |
4748 | ENUMERAL_TYPE; such a thing will already have been added to | |
4749 | the field list by tsubst_enum above. */ | |
4750 | if (!TREE_CHAIN (r)) | |
4751 | { | |
4752 | set_current_access_from_decl (r); | |
4753 | finish_member_declaration (r); | |
4754 | } | |
5566b478 | 4755 | } |
8d08fdba | 4756 | |
61a127b3 MM |
4757 | /* Set up the list (TYPE_METHODS) and vector (CLASSTYPE_METHOD_VEC) |
4758 | for this instantiation. */ | |
4759 | for (t = TYPE_METHODS (pattern); t; t = TREE_CHAIN (t)) | |
4760 | { | |
4761 | tree r = tsubst (t, args, NULL_TREE); | |
4762 | set_current_access_from_decl (r); | |
4763 | finish_member_declaration (r); | |
4764 | } | |
8d08fdba | 4765 | |
2604412d JM |
4766 | /* Construct the DECL_FRIENDLIST for the new class type. */ |
4767 | typedecl = TYPE_MAIN_DECL (type); | |
4768 | for (t = DECL_FRIENDLIST (TYPE_MAIN_DECL (pattern)); | |
4769 | t != NULL_TREE; | |
4770 | t = TREE_CHAIN (t)) | |
f84b4be9 | 4771 | { |
2604412d | 4772 | tree friends; |
f84b4be9 | 4773 | |
2604412d JM |
4774 | DECL_FRIENDLIST (typedecl) |
4775 | = tree_cons (TREE_PURPOSE (t), NULL_TREE, | |
4776 | DECL_FRIENDLIST (typedecl)); | |
f84b4be9 | 4777 | |
2604412d JM |
4778 | for (friends = TREE_VALUE (t); |
4779 | friends != NULL_TREE; | |
4780 | friends = TREE_CHAIN (friends)) | |
4781 | { | |
4782 | if (TREE_PURPOSE (friends) == error_mark_node) | |
f84b4be9 | 4783 | { |
2604412d JM |
4784 | TREE_VALUE (DECL_FRIENDLIST (typedecl)) |
4785 | = tree_cons (error_mark_node, | |
4786 | tsubst_friend_function (TREE_VALUE (friends), | |
4787 | args), | |
4788 | TREE_VALUE (DECL_FRIENDLIST (typedecl))); | |
4789 | } | |
4790 | else | |
4791 | { | |
4792 | TREE_VALUE (DECL_FRIENDLIST (typedecl)) | |
4793 | = tree_cons (tsubst (TREE_PURPOSE (friends), args, NULL_TREE), | |
4794 | NULL_TREE, | |
4795 | TREE_VALUE (DECL_FRIENDLIST (typedecl))); | |
f84b4be9 JM |
4796 | |
4797 | } | |
4798 | } | |
2604412d | 4799 | } |
5566b478 | 4800 | |
6757edfe MM |
4801 | for (t = CLASSTYPE_FRIEND_CLASSES (pattern); |
4802 | t != NULL_TREE; | |
4803 | t = TREE_CHAIN (t)) | |
4804 | { | |
4805 | tree friend_type = TREE_VALUE (t); | |
1aed5355 | 4806 | tree new_friend_type; |
6757edfe | 4807 | |
36a117a5 MM |
4808 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
4809 | new_friend_type = tsubst_friend_class (friend_type, args); | |
4810 | else if (uses_template_parms (friend_type)) | |
4811 | new_friend_type = tsubst (friend_type, args, NULL_TREE); | |
4812 | else | |
6757edfe MM |
4813 | /* The call to xref_tag_from_type does injection for friend |
4814 | classes. */ | |
1aed5355 | 4815 | new_friend_type = |
36a117a5 MM |
4816 | xref_tag_from_type (friend_type, NULL_TREE, 1); |
4817 | ||
1aed5355 MM |
4818 | |
4819 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) | |
4820 | /* Trick make_friend_class into realizing that the friend | |
4821 | we're adding is a template, not an ordinary class. It's | |
4822 | important that we use make_friend_class since it will | |
4823 | perform some error-checking and output cross-reference | |
4824 | information. */ | |
4825 | ++processing_template_decl; | |
4826 | ||
4827 | make_friend_class (type, new_friend_type); | |
fc378698 | 4828 | |
1aed5355 MM |
4829 | if (TREE_CODE (friend_type) == TEMPLATE_DECL) |
4830 | --processing_template_decl; | |
6757edfe | 4831 | } |
fc378698 | 4832 | |
2604412d JM |
4833 | /* This does injection for friend functions. */ |
4834 | if (!processing_template_decl) | |
4835 | { | |
4836 | t = tsubst (DECL_TEMPLATE_INJECT (template), args, NULL_TREE); | |
5566b478 | 4837 | |
2604412d JM |
4838 | for (; t; t = TREE_CHAIN (t)) |
4839 | { | |
4840 | tree d = TREE_VALUE (t); | |
fc378698 | 4841 | |
2604412d JM |
4842 | if (TREE_CODE (d) == TYPE_DECL) |
4843 | /* Already injected. */; | |
4844 | else | |
4845 | pushdecl (d); | |
4846 | } | |
4847 | } | |
5566b478 | 4848 | |
2604412d JM |
4849 | for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t)) |
4850 | if (TREE_CODE (t) == FIELD_DECL) | |
4851 | { | |
4852 | TREE_TYPE (t) = complete_type (TREE_TYPE (t)); | |
4853 | require_complete_type (t); | |
4854 | } | |
5566b478 | 4855 | |
61a127b3 MM |
4856 | /* Set the file and line number information to whatever is given for |
4857 | the class itself. This puts error messages involving generated | |
4858 | implicit functions at a predictable point, and the same point | |
4859 | that would be used for non-template classes. */ | |
4860 | lineno = DECL_SOURCE_LINE (typedecl); | |
4861 | input_filename = DECL_SOURCE_FILE (typedecl); | |
4862 | ||
4863 | unreverse_member_declarations (type); | |
2604412d JM |
4864 | type = finish_struct_1 (type, 0); |
4865 | CLASSTYPE_GOT_SEMICOLON (type) = 1; | |
e92cc029 | 4866 | |
5524676d JM |
4867 | /* Clear this now so repo_template_used is happy. */ |
4868 | TYPE_BEING_DEFINED (type) = 0; | |
2604412d | 4869 | repo_template_used (type); |
8d08fdba | 4870 | |
5566b478 | 4871 | popclass (0); |
5566b478 MS |
4872 | pop_from_top_level (); |
4873 | pop_tinst_level (); | |
4874 | ||
7ddedda4 MM |
4875 | end: |
4876 | pop_momentary (); | |
4877 | ||
5566b478 | 4878 | return type; |
8d08fdba MS |
4879 | } |
4880 | ||
4881 | static int | |
4882 | list_eq (t1, t2) | |
4883 | tree t1, t2; | |
4884 | { | |
4885 | if (t1 == NULL_TREE) | |
4886 | return t2 == NULL_TREE; | |
4887 | if (t2 == NULL_TREE) | |
4888 | return 0; | |
4889 | /* Don't care if one declares its arg const and the other doesn't -- the | |
4890 | main variant of the arg type is all that matters. */ | |
4891 | if (TYPE_MAIN_VARIANT (TREE_VALUE (t1)) | |
4892 | != TYPE_MAIN_VARIANT (TREE_VALUE (t2))) | |
4893 | return 0; | |
4894 | return list_eq (TREE_CHAIN (t1), TREE_CHAIN (t2)); | |
4895 | } | |
4896 | ||
00d3396f JM |
4897 | /* If arg is a non-type template parameter that does not depend on template |
4898 | arguments, fold it like we weren't in the body of a template. */ | |
4899 | ||
4900 | static tree | |
4901 | maybe_fold_nontype_arg (arg) | |
4902 | tree arg; | |
4903 | { | |
4904 | if (TREE_CODE_CLASS (TREE_CODE (arg)) != 't' | |
4905 | && !uses_template_parms (arg)) | |
4906 | { | |
4907 | /* Sometimes, one of the args was an expression involving a | |
4908 | template constant parameter, like N - 1. Now that we've | |
4909 | tsubst'd, we might have something like 2 - 1. This will | |
4910 | confuse lookup_template_class, so we do constant folding | |
4911 | here. We have to unset processing_template_decl, to | |
4912 | fool build_expr_from_tree() into building an actual | |
4913 | tree. */ | |
4914 | ||
4915 | int saved_processing_template_decl = processing_template_decl; | |
4916 | processing_template_decl = 0; | |
4917 | arg = fold (build_expr_from_tree (arg)); | |
4918 | processing_template_decl = saved_processing_template_decl; | |
4919 | } | |
4920 | return arg; | |
4921 | } | |
4922 | ||
a221d52f | 4923 | /* Return the TREE_VEC with the arguments for the innermost template header, |
36a117a5 MM |
4924 | where ARGS is either that or the VEC of VECs for all the |
4925 | arguments. */ | |
a221d52f JM |
4926 | |
4927 | tree | |
36a117a5 | 4928 | innermost_args (args) |
a221d52f | 4929 | tree args; |
a221d52f | 4930 | { |
36a117a5 | 4931 | return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args)); |
a221d52f | 4932 | } |
f84b4be9 | 4933 | |
830bfa74 MM |
4934 | /* Substitute ARGS into the vector of template arguments T. */ |
4935 | ||
4936 | tree | |
4937 | tsubst_template_arg_vector (t, args) | |
4938 | tree t; | |
4939 | tree args; | |
4940 | { | |
4941 | int len = TREE_VEC_LENGTH (t), need_new = 0, i; | |
4942 | tree *elts = (tree *) alloca (len * sizeof (tree)); | |
4943 | ||
4944 | bzero ((char *) elts, len * sizeof (tree)); | |
4945 | ||
4946 | for (i = 0; i < len; i++) | |
4947 | { | |
4948 | if (TREE_VEC_ELT (t, i) != NULL_TREE | |
4949 | && TREE_CODE (TREE_VEC_ELT (t, i)) == TREE_VEC) | |
4950 | elts[i] = tsubst_template_arg_vector (TREE_VEC_ELT (t, i), args); | |
4951 | else | |
4952 | elts[i] = maybe_fold_nontype_arg | |
4953 | (tsubst_expr (TREE_VEC_ELT (t, i), args, NULL_TREE)); | |
4954 | ||
4955 | if (elts[i] != TREE_VEC_ELT (t, i)) | |
4956 | need_new = 1; | |
4957 | } | |
4958 | ||
4959 | if (!need_new) | |
4960 | return t; | |
4961 | ||
7ddedda4 | 4962 | t = make_temp_vec (len); |
830bfa74 MM |
4963 | for (i = 0; i < len; i++) |
4964 | TREE_VEC_ELT (t, i) = elts[i]; | |
4965 | ||
4966 | return t; | |
4967 | } | |
4968 | ||
36a117a5 MM |
4969 | /* Return the result of substituting ARGS into the template parameters |
4970 | given by PARMS. If there are m levels of ARGS and m + n levels of | |
4971 | PARMS, then the result will contain n levels of PARMS. For | |
4972 | example, if PARMS is `template <class T> template <class U> | |
4973 | template <T*, U, class V>' and ARGS is {{int}, {double}} then the | |
4974 | result will be `template <int*, double, class V>'. */ | |
4975 | ||
4976 | tree | |
4977 | tsubst_template_parms (parms, args) | |
4978 | tree parms; | |
4979 | tree args; | |
4980 | { | |
4981 | tree r; | |
4982 | tree* new_parms = &r; | |
4983 | ||
4984 | for (new_parms = &r; | |
4985 | TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args); | |
4986 | new_parms = &(TREE_CHAIN (*new_parms)), | |
4987 | parms = TREE_CHAIN (parms)) | |
4988 | { | |
4989 | tree new_vec = | |
4990 | make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms))); | |
4991 | int i; | |
4992 | ||
4993 | for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i) | |
4994 | { | |
4995 | tree default_value = | |
4996 | TREE_PURPOSE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
4997 | tree parm_decl = | |
4998 | TREE_VALUE (TREE_VEC_ELT (TREE_VALUE (parms), i)); | |
4999 | ||
5000 | TREE_VEC_ELT (new_vec, i) | |
5001 | = build_tree_list (tsubst (default_value, args, NULL_TREE), | |
5002 | tsubst (parm_decl, args, NULL_TREE)); | |
5003 | ||
5004 | } | |
5005 | ||
5006 | *new_parms = | |
5007 | tree_cons (build_int_2 (0, (TMPL_PARMS_DEPTH (parms) | |
5008 | - TMPL_ARGS_DEPTH (args))), | |
5009 | new_vec, NULL_TREE); | |
5010 | } | |
5011 | ||
5012 | return r; | |
5013 | } | |
5014 | ||
ed44da02 MM |
5015 | /* Substitute the ARGS into the indicated aggregate (or enumeration) |
5016 | type T. If T is not an aggregate or enumeration type, it is | |
5017 | handled as if by tsubst. IN_DECL is as for tsubst. If | |
5018 | ENTERING_SCOPE is non-zero, T is the context for a template which | |
5019 | we are presently tsubst'ing. Return the subsituted value. */ | |
36a117a5 MM |
5020 | |
5021 | tree | |
5022 | tsubst_aggr_type (t, args, in_decl, entering_scope) | |
5023 | tree t; | |
5024 | tree args; | |
5025 | tree in_decl; | |
5026 | int entering_scope; | |
5027 | { | |
5028 | if (t == NULL_TREE) | |
5029 | return NULL_TREE; | |
5030 | ||
5031 | switch (TREE_CODE (t)) | |
5032 | { | |
5033 | case RECORD_TYPE: | |
5034 | if (TYPE_PTRMEMFUNC_P (t)) | |
5035 | { | |
5036 | tree r = build_ptrmemfunc_type | |
5037 | (tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, in_decl)); | |
91063b51 | 5038 | return cp_build_qualified_type (r, TYPE_QUALS (t)); |
36a117a5 MM |
5039 | } |
5040 | ||
5041 | /* else fall through */ | |
ed44da02 | 5042 | case ENUMERAL_TYPE: |
36a117a5 | 5043 | case UNION_TYPE: |
5db698f6 | 5044 | if (TYPE_TEMPLATE_INFO (t)) |
36a117a5 MM |
5045 | { |
5046 | tree argvec; | |
5047 | tree context; | |
5048 | tree r; | |
5049 | ||
5050 | /* First, determine the context for the type we are looking | |
5051 | up. */ | |
5052 | if (TYPE_CONTEXT (t) != NULL_TREE) | |
5053 | context = tsubst_aggr_type (TYPE_CONTEXT (t), args, | |
5054 | in_decl, /*entering_scope=*/1); | |
5055 | else | |
5056 | context = NULL_TREE; | |
5057 | ||
5058 | /* Then, figure out what arguments are appropriate for the | |
5059 | type we are trying to find. For example, given: | |
5060 | ||
5061 | template <class T> struct S; | |
5062 | template <class T, class U> void f(T, U) { S<U> su; } | |
5063 | ||
5064 | and supposing that we are instantiating f<int, double>, | |
5065 | then our ARGS will be {int, double}, but, when looking up | |
5066 | S we only want {double}. */ | |
7ddedda4 MM |
5067 | push_momentary (); |
5068 | argvec = tsubst_template_arg_vector (TYPE_TI_ARGS (t), args); | |
36a117a5 MM |
5069 | |
5070 | r = lookup_template_class (t, argvec, in_decl, context, | |
5071 | entering_scope); | |
7ddedda4 | 5072 | pop_momentary (); |
36a117a5 | 5073 | |
91063b51 | 5074 | return cp_build_qualified_type (r, TYPE_QUALS (t)); |
36a117a5 MM |
5075 | } |
5076 | else | |
5077 | /* This is not a template type, so there's nothing to do. */ | |
5078 | return t; | |
5079 | ||
5080 | default: | |
5081 | return tsubst (t, args, in_decl); | |
5082 | } | |
5083 | } | |
5084 | ||
ae58fa02 MM |
5085 | /* Substitute the ARGS into the T, which is a _DECL. TYPE is the |
5086 | (already computed) substitution of ARGS into TREE_TYPE (T), if | |
5087 | appropriate. Return the result of the substitution. IN_DECL is as | |
5088 | for tsubst. */ | |
00d3396f | 5089 | |
75b0bbce | 5090 | tree |
ae58fa02 MM |
5091 | tsubst_decl (t, args, type, in_decl) |
5092 | tree t; | |
5093 | tree args; | |
5094 | tree type; | |
8d08fdba MS |
5095 | tree in_decl; |
5096 | { | |
ae58fa02 MM |
5097 | int saved_lineno; |
5098 | char* saved_filename; | |
b370501f | 5099 | tree r = NULL_TREE; |
830bfa74 | 5100 | |
ae58fa02 MM |
5101 | /* Set the filename and linenumber to improve error-reporting. */ |
5102 | saved_lineno = lineno; | |
5103 | saved_filename = input_filename; | |
5104 | lineno = DECL_SOURCE_LINE (t); | |
5105 | input_filename = DECL_SOURCE_FILE (t); | |
b7484fbe | 5106 | |
8d08fdba MS |
5107 | switch (TREE_CODE (t)) |
5108 | { | |
98c1c668 JM |
5109 | case TEMPLATE_DECL: |
5110 | { | |
5111 | /* We can get here when processing a member template function | |
5112 | of a template class. */ | |
98c1c668 | 5113 | tree decl = DECL_TEMPLATE_RESULT (t); |
386b8a85 | 5114 | tree spec; |
db2767b6 | 5115 | int is_template_template_parm = DECL_TEMPLATE_TEMPLATE_PARM_P (t); |
98c1c668 | 5116 | |
db2767b6 MM |
5117 | if (!is_template_template_parm) |
5118 | { | |
36a117a5 MM |
5119 | /* We might already have an instance of this template. |
5120 | The ARGS are for the surrounding class type, so the | |
5121 | full args contain the tsubst'd args for the context, | |
5122 | plus the innermost args from the template decl. */ | |
5123 | tree tmpl_args = DECL_CLASS_TEMPLATE_P (t) | |
5124 | ? CLASSTYPE_TI_ARGS (TREE_TYPE (t)) | |
5125 | : DECL_TI_ARGS (DECL_RESULT (t)); | |
7ddedda4 MM |
5126 | tree full_args; |
5127 | ||
5128 | push_momentary (); | |
5129 | full_args = tsubst_template_arg_vector (tmpl_args, args); | |
36a117a5 MM |
5130 | |
5131 | /* tsubst_template_arg_vector doesn't copy the vector if | |
5132 | nothing changed. But, *something* should have | |
5133 | changed. */ | |
5134 | my_friendly_assert (full_args != tmpl_args, 0); | |
5135 | ||
5136 | spec = retrieve_specialization (t, full_args); | |
7ddedda4 | 5137 | pop_momentary (); |
db2767b6 | 5138 | if (spec != NULL_TREE) |
ae58fa02 MM |
5139 | { |
5140 | r = spec; | |
5141 | break; | |
5142 | } | |
db2767b6 | 5143 | } |
98c1c668 JM |
5144 | |
5145 | /* Make a new template decl. It will be similar to the | |
5146 | original, but will record the current template arguments. | |
5147 | We also create a new function declaration, which is just | |
5148 | like the old one, but points to this new template, rather | |
5149 | than the old one. */ | |
ae58fa02 MM |
5150 | r = copy_node (t); |
5151 | copy_lang_decl (r); | |
5152 | my_friendly_assert (DECL_LANG_SPECIFIC (r) != 0, 0); | |
5153 | TREE_CHAIN (r) = NULL_TREE; | |
db2767b6 MM |
5154 | |
5155 | if (is_template_template_parm) | |
5156 | { | |
5157 | tree new_decl = tsubst (decl, args, in_decl); | |
ae58fa02 MM |
5158 | DECL_RESULT (r) = new_decl; |
5159 | TREE_TYPE (r) = TREE_TYPE (new_decl); | |
5160 | break; | |
db2767b6 MM |
5161 | } |
5162 | ||
ae58fa02 | 5163 | DECL_CONTEXT (r) |
36a117a5 MM |
5164 | = tsubst_aggr_type (DECL_CONTEXT (t), args, in_decl, |
5165 | /*entering_scope=*/1); | |
ae58fa02 | 5166 | DECL_CLASS_CONTEXT (r) |
36a117a5 MM |
5167 | = tsubst_aggr_type (DECL_CLASS_CONTEXT (t), args, in_decl, |
5168 | /*entering_scope=*/1); | |
ae58fa02 | 5169 | DECL_TEMPLATE_INFO (r) = build_tree_list (t, args); |
93cdc044 JM |
5170 | |
5171 | if (TREE_CODE (decl) == TYPE_DECL) | |
5172 | { | |
5173 | tree new_type = tsubst (TREE_TYPE (t), args, in_decl); | |
ae58fa02 MM |
5174 | TREE_TYPE (r) = new_type; |
5175 | CLASSTYPE_TI_TEMPLATE (new_type) = r; | |
5176 | DECL_RESULT (r) = TYPE_MAIN_DECL (new_type); | |
5177 | DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type); | |
93cdc044 JM |
5178 | } |
5179 | else | |
5180 | { | |
5181 | tree new_decl = tsubst (decl, args, in_decl); | |
ae58fa02 MM |
5182 | DECL_RESULT (r) = new_decl; |
5183 | DECL_TI_TEMPLATE (new_decl) = r; | |
5184 | TREE_TYPE (r) = TREE_TYPE (new_decl); | |
5185 | DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl); | |
93cdc044 JM |
5186 | } |
5187 | ||
ae58fa02 MM |
5188 | SET_DECL_IMPLICIT_INSTANTIATION (r); |
5189 | DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE; | |
5190 | DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE; | |
98c1c668 JM |
5191 | |
5192 | /* The template parameters for this new template are all the | |
5193 | template parameters for the old template, except the | |
5194 | outermost level of parameters. */ | |
ae58fa02 | 5195 | DECL_TEMPLATE_PARMS (r) |
36a117a5 | 5196 | = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args); |
98c1c668 | 5197 | |
93cdc044 | 5198 | if (PRIMARY_TEMPLATE_P (t)) |
ae58fa02 | 5199 | DECL_PRIMARY_TEMPLATE (r) = r; |
93cdc044 | 5200 | |
8d019cef | 5201 | /* We don't partially instantiate partial specializations. */ |
93cdc044 | 5202 | if (TREE_CODE (decl) == TYPE_DECL) |
ae58fa02 | 5203 | break; |
93cdc044 | 5204 | |
75650646 MM |
5205 | for (spec = DECL_TEMPLATE_SPECIALIZATIONS (t); |
5206 | spec != NULL_TREE; | |
5207 | spec = TREE_CHAIN (spec)) | |
5208 | { | |
5209 | /* It helps to consider example here. Consider: | |
5210 | ||
5211 | template <class T> | |
5212 | struct S { | |
5213 | template <class U> | |
5214 | void f(U u); | |
5215 | ||
5216 | template <> | |
5217 | void f(T* t) {} | |
5218 | }; | |
5219 | ||
5220 | Now, for example, we are instantiating S<int>::f(U u). | |
5221 | We want to make a template: | |
5222 | ||
5223 | template <class U> | |
5224 | void S<int>::f(U); | |
5225 | ||
5226 | It will have a specialization, for the case U = int*, of | |
5227 | the form: | |
5228 | ||
5229 | template <> | |
5230 | void S<int>::f<int*>(int*); | |
5231 | ||
5232 | This specialization will be an instantiation of | |
5233 | the specialization given in the declaration of S, with | |
5234 | argument list int*. */ | |
5235 | ||
5236 | tree fn = TREE_VALUE (spec); | |
5237 | tree spec_args; | |
5238 | tree new_fn; | |
5239 | ||
5240 | if (!DECL_TEMPLATE_SPECIALIZATION (fn)) | |
5241 | /* Instantiations are on the same list, but they're of | |
5242 | no concern to us. */ | |
5243 | continue; | |
5244 | ||
36a117a5 MM |
5245 | if (TREE_CODE (fn) != TEMPLATE_DECL) |
5246 | /* A full specialization. There's no need to record | |
5247 | that here. */ | |
5248 | continue; | |
5249 | ||
5250 | spec_args = tsubst (DECL_TI_ARGS (fn), args, in_decl); | |
5251 | new_fn = tsubst (DECL_RESULT (most_general_template (fn)), | |
5252 | spec_args, in_decl); | |
5253 | DECL_TI_TEMPLATE (new_fn) = fn; | |
ae58fa02 | 5254 | register_specialization (new_fn, r, |
36a117a5 | 5255 | innermost_args (spec_args)); |
75650646 MM |
5256 | } |
5257 | ||
5258 | /* Record this partial instantiation. */ | |
ae58fa02 MM |
5259 | register_specialization (r, t, |
5260 | DECL_TI_ARGS (DECL_RESULT (r))); | |
75650646 | 5261 | |
98c1c668 | 5262 | } |
ae58fa02 | 5263 | break; |
8d08fdba MS |
5264 | |
5265 | case FUNCTION_DECL: | |
5266 | { | |
386b8a85 | 5267 | tree ctx; |
87603ed0 | 5268 | tree argvec = NULL_TREE; |
36a117a5 | 5269 | tree gen_tmpl; |
5566b478 | 5270 | int member; |
d8c4447d MM |
5271 | int args_depth; |
5272 | int parms_depth; | |
5566b478 | 5273 | |
36a117a5 MM |
5274 | /* Nobody should be tsubst'ing into non-template functions. */ |
5275 | my_friendly_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE, 0); | |
5276 | ||
5277 | if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL) | |
5278 | { | |
5279 | tree spec; | |
5280 | ||
7ddedda4 MM |
5281 | /* Allocate template arguments on the momentary obstack, |
5282 | in case we don't need to keep them. */ | |
5283 | push_momentary (); | |
5284 | ||
36a117a5 MM |
5285 | /* Calculate the most general template of which R is a |
5286 | specialization, and the complete set of arguments used to | |
5287 | specialize R. */ | |
5288 | gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t)); | |
7ddedda4 MM |
5289 | argvec |
5290 | = tsubst_template_arg_vector (DECL_TI_ARGS | |
5291 | (DECL_TEMPLATE_RESULT (gen_tmpl)), | |
5292 | args); | |
36a117a5 MM |
5293 | |
5294 | /* Check to see if we already have this specialization. */ | |
5295 | spec = retrieve_specialization (gen_tmpl, argvec); | |
7ddedda4 | 5296 | |
36a117a5 | 5297 | if (spec) |
ae58fa02 MM |
5298 | { |
5299 | r = spec; | |
7ddedda4 | 5300 | pop_momentary (); |
ae58fa02 MM |
5301 | break; |
5302 | } | |
d8c4447d | 5303 | |
7ddedda4 MM |
5304 | /* We're going to need to keep the ARGVEC, so we copy it |
5305 | here. */ | |
5306 | argvec = copy_to_permanent (argvec); | |
5307 | pop_momentary (); | |
5308 | ||
d8c4447d MM |
5309 | /* Here, we deal with the peculiar case: |
5310 | ||
5311 | template <class T> struct S { | |
5312 | template <class U> friend void f(); | |
5313 | }; | |
5314 | template <class U> friend void f() {} | |
5315 | template S<int>; | |
5316 | template void f<double>(); | |
5317 | ||
5318 | Here, the ARGS for the instantiation of will be {int, | |
5319 | double}. But, we only need as many ARGS as there are | |
5320 | levels of template parameters in CODE_PATTERN. We are | |
5321 | careful not to get fooled into reducing the ARGS in | |
5322 | situations like: | |
5323 | ||
5324 | template <class T> struct S { template <class U> void f(U); } | |
5325 | template <class T> template <> void S<T>::f(int) {} | |
5326 | ||
5327 | which we can spot because the pattern will be a | |
5328 | specialization in this case. */ | |
5329 | args_depth = TMPL_ARGS_DEPTH (args); | |
5330 | parms_depth = | |
5331 | TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t))); | |
5332 | if (args_depth > parms_depth | |
5333 | && !DECL_TEMPLATE_SPECIALIZATION (t)) | |
5334 | { | |
5335 | my_friendly_assert (DECL_FRIEND_P (t), 0); | |
5336 | ||
5337 | if (parms_depth > 1) | |
5338 | { | |
5339 | int i; | |
5340 | ||
5341 | args = make_temp_vec (parms_depth); | |
5342 | for (i = 0; i < parms_depth; ++i) | |
5343 | TREE_VEC_ELT (args, i) = | |
5344 | TREE_VEC_ELT (args, i + (args_depth - parms_depth)); | |
5345 | } | |
5346 | else | |
5347 | args = TREE_VEC_ELT (args, args_depth - parms_depth); | |
5348 | } | |
36a117a5 MM |
5349 | } |
5350 | else | |
5351 | { | |
5352 | /* This special case arises when we have something like this: | |
5353 | ||
5354 | template <class T> struct S { | |
5355 | friend void f<int>(int, double); | |
5356 | }; | |
5357 | ||
5358 | Here, the DECL_TI_TEMPLATE for the friend declaration | |
39c01e4c MM |
5359 | will be a LOOKUP_EXPR or an IDENTIFIER_NODE. We are |
5360 | being called from tsubst_friend_function, and we want | |
5361 | only to create a new decl (R) with appropriate types so | |
5362 | that we can call determine_specialization. */ | |
5363 | my_friendly_assert ((TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5364 | == LOOKUP_EXPR) | |
5365 | || (TREE_CODE (DECL_TI_TEMPLATE (t)) | |
5366 | == IDENTIFIER_NODE), 0); | |
36a117a5 MM |
5367 | gen_tmpl = NULL_TREE; |
5368 | } | |
5369 | ||
6eb3bb27 | 5370 | if (DECL_CLASS_SCOPE_P (t)) |
8d08fdba | 5371 | { |
5566b478 MS |
5372 | if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t))) |
5373 | member = 2; | |
5374 | else | |
5375 | member = 1; | |
36a117a5 MM |
5376 | ctx = tsubst_aggr_type (DECL_CLASS_CONTEXT (t), args, t, |
5377 | /*entering_scope=*/1); | |
5566b478 MS |
5378 | } |
5379 | else | |
5380 | { | |
5381 | member = 0; | |
5382 | ctx = NULL_TREE; | |
5566b478 | 5383 | } |
eff71ab0 | 5384 | type = tsubst (type, args, in_decl); |
8d08fdba | 5385 | |
5566b478 MS |
5386 | /* We do NOT check for matching decls pushed separately at this |
5387 | point, as they may not represent instantiations of this | |
5388 | template, and in any case are considered separate under the | |
312e7d50 | 5389 | discrete model. Instead, see add_maybe_template. */ |
5566b478 MS |
5390 | |
5391 | r = copy_node (t); | |
5392 | copy_lang_decl (r); | |
e1467ff2 | 5393 | DECL_USE_TEMPLATE (r) = 0; |
5566b478 MS |
5394 | TREE_TYPE (r) = type; |
5395 | ||
5396 | DECL_CONTEXT (r) | |
36a117a5 | 5397 | = tsubst_aggr_type (DECL_CONTEXT (t), args, t, /*entering_scope=*/1); |
5566b478 MS |
5398 | DECL_CLASS_CONTEXT (r) = ctx; |
5399 | ||
4c571114 | 5400 | if (member && IDENTIFIER_TYPENAME_P (DECL_NAME (r))) |
f181d4ae MM |
5401 | /* Type-conversion operator. Reconstruct the name, in |
5402 | case it's the name of one of the template's parameters. */ | |
5403 | DECL_NAME (r) = build_typename_overload (TREE_TYPE (type)); | |
5566b478 | 5404 | |
711734a9 JM |
5405 | DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args, t); |
5406 | DECL_MAIN_VARIANT (r) = r; | |
5407 | DECL_RESULT (r) = NULL_TREE; | |
711734a9 JM |
5408 | |
5409 | TREE_STATIC (r) = 0; | |
5410 | TREE_PUBLIC (r) = TREE_PUBLIC (t); | |
5411 | DECL_EXTERNAL (r) = 1; | |
5412 | DECL_INTERFACE_KNOWN (r) = 0; | |
5413 | DECL_DEFER_OUTPUT (r) = 0; | |
5414 | TREE_CHAIN (r) = NULL_TREE; | |
5415 | DECL_PENDING_INLINE_INFO (r) = 0; | |
5416 | TREE_USED (r) = 0; | |
5417 | ||
36a117a5 MM |
5418 | /* Set up the DECL_TEMPLATE_INFO for R and compute its mangled |
5419 | name. There's no need to do this in the special friend | |
5420 | case mentioned above where GEN_TMPL is NULL. */ | |
5421 | if (gen_tmpl) | |
386b8a85 | 5422 | { |
7ddedda4 MM |
5423 | /* The ARGVEC was built on the momentary obstack. Make it |
5424 | permanent now. */ | |
5425 | argvec = copy_to_permanent (argvec); | |
36a117a5 MM |
5426 | DECL_TEMPLATE_INFO (r) |
5427 | = perm_tree_cons (gen_tmpl, argvec, NULL_TREE); | |
5428 | SET_DECL_IMPLICIT_INSTANTIATION (r); | |
5429 | register_specialization (r, gen_tmpl, argvec); | |
5430 | ||
5431 | /* Set the mangled name for R. */ | |
5432 | if (DECL_DESTRUCTOR_P (t)) | |
5433 | DECL_ASSEMBLER_NAME (r) = build_destructor_name (ctx); | |
5434 | else | |
386b8a85 | 5435 | { |
36a117a5 MM |
5436 | /* Instantiations of template functions must be mangled |
5437 | specially, in order to conform to 14.5.5.1 | |
5438 | [temp.over.link]. */ | |
5439 | tree tmpl = DECL_TI_TEMPLATE (t); | |
386b8a85 | 5440 | |
36a117a5 MM |
5441 | /* TMPL will be NULL if this is a specialization of a |
5442 | member function of a template class. */ | |
5443 | if (name_mangling_version < 1 | |
5444 | || tmpl == NULL_TREE | |
5445 | || (member && !is_member_template (tmpl) | |
5446 | && !DECL_TEMPLATE_INFO (tmpl))) | |
5447 | set_mangled_name_for_decl (r); | |
75650646 | 5448 | else |
36a117a5 | 5449 | set_mangled_name_for_template_decl (r); |
386b8a85 | 5450 | } |
36a117a5 MM |
5451 | |
5452 | DECL_RTL (r) = 0; | |
5453 | make_decl_rtl (r, NULL_PTR, 1); | |
5454 | ||
5455 | /* Like grokfndecl. If we don't do this, pushdecl will | |
5456 | mess up our TREE_CHAIN because it doesn't find a | |
5457 | previous decl. Sigh. */ | |
5458 | if (member | |
c36ae80f | 5459 | && ! uses_template_parms (r) |
36a117a5 MM |
5460 | && (IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r)) |
5461 | == NULL_TREE)) | |
5462 | SET_IDENTIFIER_GLOBAL_VALUE (DECL_ASSEMBLER_NAME (r), r); | |
386b8a85 | 5463 | } |
f181d4ae MM |
5464 | |
5465 | if (DECL_CONSTRUCTOR_P (r)) | |
5466 | { | |
5467 | maybe_retrofit_in_chrg (r); | |
5468 | grok_ctor_properties (ctx, r); | |
5469 | } | |
5470 | if (IDENTIFIER_OPNAME_P (DECL_NAME (r))) | |
5471 | grok_op_properties (r, DECL_VIRTUAL_P (r), DECL_FRIEND_P (r)); | |
8d08fdba | 5472 | } |
ae58fa02 | 5473 | break; |
8d08fdba MS |
5474 | |
5475 | case PARM_DECL: | |
5476 | { | |
ae58fa02 | 5477 | r = copy_node (t); |
5566b478 | 5478 | TREE_TYPE (r) = type; |
db2767b6 MM |
5479 | if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX) |
5480 | DECL_INITIAL (r) = TREE_TYPE (r); | |
5481 | else | |
5482 | DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args, in_decl); | |
5483 | ||
5566b478 | 5484 | DECL_CONTEXT (r) = NULL_TREE; |
f83b0cb6 JM |
5485 | #ifdef PROMOTE_PROTOTYPES |
5486 | if ((TREE_CODE (type) == INTEGER_TYPE | |
5487 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
5488 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
5489 | DECL_ARG_TYPE (r) = integer_type_node; | |
5490 | #endif | |
8d08fdba | 5491 | if (TREE_CHAIN (t)) |
f7d98d58 | 5492 | TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args, TREE_CHAIN (t)); |
8d08fdba | 5493 | } |
ae58fa02 | 5494 | break; |
8d08fdba | 5495 | |
5566b478 MS |
5496 | case FIELD_DECL: |
5497 | { | |
ae58fa02 | 5498 | r = copy_node (t); |
5566b478 MS |
5499 | TREE_TYPE (r) = type; |
5500 | copy_lang_decl (r); | |
5501 | #if 0 | |
f7d98d58 | 5502 | DECL_FIELD_CONTEXT (r) = tsubst (DECL_FIELD_CONTEXT (t), args, in_decl); |
5566b478 | 5503 | #endif |
f7d98d58 | 5504 | DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args, in_decl); |
5566b478 | 5505 | TREE_CHAIN (r) = NULL_TREE; |
519ebd1e | 5506 | if (TREE_CODE (type) == VOID_TYPE) |
8251199e | 5507 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5508 | } |
ae58fa02 | 5509 | break; |
5566b478 MS |
5510 | |
5511 | case USING_DECL: | |
5512 | { | |
ae58fa02 | 5513 | r = copy_node (t); |
5566b478 | 5514 | DECL_INITIAL (r) |
f7d98d58 | 5515 | = tsubst_copy (DECL_INITIAL (t), args, in_decl); |
5566b478 | 5516 | TREE_CHAIN (r) = NULL_TREE; |
5566b478 | 5517 | } |
ae58fa02 | 5518 | break; |
5566b478 MS |
5519 | |
5520 | case VAR_DECL: | |
5521 | { | |
36a117a5 MM |
5522 | tree argvec; |
5523 | tree gen_tmpl; | |
5524 | tree spec; | |
5525 | tree tmpl; | |
5526 | tree ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, in_decl, | |
5527 | /*entering_scope=*/1); | |
5528 | ||
5529 | /* Nobody should be tsubst'ing into non-template variables. */ | |
5530 | my_friendly_assert (DECL_LANG_SPECIFIC (t) | |
5531 | && DECL_TEMPLATE_INFO (t) != NULL_TREE, 0); | |
5566b478 | 5532 | |
36a117a5 MM |
5533 | /* Check to see if we already have this specialization. */ |
5534 | tmpl = DECL_TI_TEMPLATE (t); | |
5535 | gen_tmpl = most_general_template (tmpl); | |
5536 | argvec = tsubst (DECL_TI_ARGS (t), args, in_decl); | |
5537 | spec = retrieve_specialization (gen_tmpl, argvec); | |
5538 | ||
5539 | if (spec) | |
ae58fa02 MM |
5540 | { |
5541 | r = spec; | |
5542 | break; | |
5543 | } | |
5566b478 MS |
5544 | |
5545 | r = copy_node (t); | |
5546 | TREE_TYPE (r) = type; | |
5547 | DECL_CONTEXT (r) = ctx; | |
5548 | if (TREE_STATIC (r)) | |
5549 | DECL_ASSEMBLER_NAME (r) | |
5550 | = build_static_name (DECL_CONTEXT (r), DECL_NAME (r)); | |
d11ad92e MS |
5551 | |
5552 | /* Don't try to expand the initializer until someone tries to use | |
5553 | this variable; otherwise we run into circular dependencies. */ | |
5554 | DECL_INITIAL (r) = NULL_TREE; | |
5566b478 MS |
5555 | DECL_RTL (r) = 0; |
5556 | DECL_SIZE (r) = 0; | |
36a117a5 MM |
5557 | copy_lang_decl (r); |
5558 | DECL_CLASS_CONTEXT (r) = DECL_CONTEXT (r); | |
5566b478 | 5559 | |
36a117a5 MM |
5560 | DECL_TEMPLATE_INFO (r) = perm_tree_cons (tmpl, argvec, NULL_TREE); |
5561 | SET_DECL_IMPLICIT_INSTANTIATION (r); | |
5562 | register_specialization (r, gen_tmpl, argvec); | |
5566b478 | 5563 | |
5566b478 | 5564 | TREE_CHAIN (r) = NULL_TREE; |
519ebd1e | 5565 | if (TREE_CODE (type) == VOID_TYPE) |
8251199e | 5566 | cp_error_at ("instantiation of `%D' as type void", r); |
5566b478 | 5567 | } |
ae58fa02 | 5568 | break; |
5566b478 MS |
5569 | |
5570 | case TYPE_DECL: | |
d2e5ee5c | 5571 | if (t == TYPE_NAME (TREE_TYPE (t))) |
ae58fa02 MM |
5572 | r = TYPE_NAME (type); |
5573 | else | |
5574 | { | |
5575 | r = copy_node (t); | |
5576 | TREE_TYPE (r) = type; | |
5577 | DECL_CONTEXT (r) = current_class_type; | |
5578 | TREE_CHAIN (r) = NULL_TREE; | |
5579 | } | |
5580 | break; | |
5581 | ||
5582 | default: | |
5583 | my_friendly_abort (0); | |
5584 | } | |
5585 | ||
5586 | /* Restore the file and line information. */ | |
5587 | lineno = saved_lineno; | |
5588 | input_filename = saved_filename; | |
5589 | ||
5590 | return r; | |
5591 | } | |
5592 | ||
cabc336a MM |
5593 | /* Substitue into the ARG_TYPES of a function type. */ |
5594 | ||
5595 | tree | |
5596 | tsubst_arg_types (arg_types, args, in_decl) | |
5597 | tree arg_types; | |
5598 | tree args; | |
5599 | tree in_decl; | |
5600 | { | |
5601 | tree remaining_arg_types; | |
cabc336a MM |
5602 | tree type; |
5603 | ||
5604 | if (!arg_types || arg_types == void_list_node) | |
5605 | return arg_types; | |
5606 | ||
5607 | remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types), | |
5608 | args, in_decl); | |
5609 | ||
5610 | /* We use TYPE_MAIN_VARIANT is because top-level qualifiers don't | |
5611 | matter on function types. */ | |
5612 | type = TYPE_MAIN_VARIANT (type_decays_to | |
5613 | (tsubst (TREE_VALUE (arg_types), | |
5614 | args, in_decl))); | |
5615 | ||
5616 | /* Note that we do not substitute into default arguments here. The | |
5617 | standard mandates that they be instantiated only when needed, | |
5618 | which is done in build_over_call. */ | |
5619 | return hash_tree_cons_simple (TREE_PURPOSE (arg_types), type, | |
5620 | remaining_arg_types); | |
5621 | ||
5622 | } | |
5623 | ||
ae58fa02 MM |
5624 | /* Take the tree structure T and replace template parameters used therein |
5625 | with the argument vector ARGS. IN_DECL is an associated decl for | |
5626 | diagnostics. | |
5627 | ||
5628 | tsubst is used for dealing with types, decls and the like; for | |
5629 | expressions, use tsubst_expr or tsubst_copy. */ | |
5630 | ||
5631 | tree | |
5632 | tsubst (t, args, in_decl) | |
5633 | tree t, args; | |
5634 | tree in_decl; | |
5635 | { | |
0ecfe0b4 | 5636 | tree type, r; |
ae58fa02 MM |
5637 | |
5638 | if (t == NULL_TREE || t == error_mark_node | |
5639 | || t == integer_type_node | |
5640 | || t == void_type_node | |
5641 | || t == char_type_node | |
5642 | || TREE_CODE (t) == NAMESPACE_DECL) | |
5643 | return t; | |
5644 | ||
5645 | if (TREE_CODE (t) == IDENTIFIER_NODE) | |
5646 | type = IDENTIFIER_TYPE_VALUE (t); | |
5647 | else | |
5648 | type = TREE_TYPE (t); | |
5649 | if (type == unknown_type_node) | |
5650 | my_friendly_abort (42); | |
5651 | ||
5652 | if (type && TREE_CODE (t) != FUNCTION_DECL | |
5653 | && TREE_CODE (t) != TYPENAME_TYPE | |
5654 | && TREE_CODE (t) != TEMPLATE_DECL | |
5655 | && TREE_CODE (t) != IDENTIFIER_NODE) | |
5656 | type = tsubst (type, args, in_decl); | |
5657 | ||
5658 | if (TREE_CODE_CLASS (TREE_CODE (t)) == 'd') | |
5659 | return tsubst_decl (t, args, type, in_decl); | |
5660 | ||
5661 | switch (TREE_CODE (t)) | |
5662 | { | |
5663 | case RECORD_TYPE: | |
5664 | case UNION_TYPE: | |
5665 | case ENUMERAL_TYPE: | |
5666 | return tsubst_aggr_type (t, args, in_decl, /*entering_scope=*/0); | |
5667 | ||
5668 | case ERROR_MARK: | |
5669 | case IDENTIFIER_NODE: | |
5670 | case OP_IDENTIFIER: | |
5671 | case VOID_TYPE: | |
5672 | case REAL_TYPE: | |
5673 | case COMPLEX_TYPE: | |
5674 | case BOOLEAN_TYPE: | |
5675 | case INTEGER_CST: | |
5676 | case REAL_CST: | |
5677 | case STRING_CST: | |
5678 | return t; | |
5679 | ||
5680 | case INTEGER_TYPE: | |
5681 | if (t == integer_type_node) | |
5682 | return t; | |
5683 | ||
5684 | if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST | |
5685 | && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST) | |
5686 | return t; | |
d2e5ee5c | 5687 | |
5566b478 | 5688 | { |
ae58fa02 | 5689 | tree max = TREE_OPERAND (TYPE_MAX_VALUE (t), 0); |
7ddedda4 | 5690 | |
ae58fa02 MM |
5691 | max = tsubst_expr (max, args, in_decl); |
5692 | if (processing_template_decl) | |
5693 | { | |
5694 | tree itype = make_node (INTEGER_TYPE); | |
5695 | TYPE_MIN_VALUE (itype) = size_zero_node; | |
5696 | TYPE_MAX_VALUE (itype) = build_min (MINUS_EXPR, sizetype, max, | |
5697 | integer_one_node); | |
5698 | return itype; | |
5699 | } | |
5700 | ||
0ecfe0b4 JM |
5701 | if (pedantic && integer_zerop (max)) |
5702 | pedwarn ("creating array with size zero"); | |
5703 | else if (INT_CST_LT (max, integer_zero_node)) | |
5704 | { | |
5705 | cp_error ("creating array with size `%E'", max); | |
5706 | max = integer_one_node; | |
5707 | } | |
5708 | ||
ae58fa02 | 5709 | max = fold (build_binary_op (MINUS_EXPR, max, integer_one_node, 1)); |
7ddedda4 MM |
5710 | if (!TREE_PERMANENT (max) && !allocation_temporary_p ()) |
5711 | max = copy_to_permanent (max); | |
120ecb8a | 5712 | return build_index_type (max); |
ae58fa02 MM |
5713 | } |
5714 | ||
5715 | case TEMPLATE_TYPE_PARM: | |
5716 | case TEMPLATE_TEMPLATE_PARM: | |
5717 | case TEMPLATE_PARM_INDEX: | |
5718 | { | |
5719 | int idx; | |
5720 | int level; | |
5721 | int levels; | |
0ecfe0b4 JM |
5722 | |
5723 | r = NULL_TREE; | |
ae58fa02 MM |
5724 | |
5725 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM | |
5726 | || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM) | |
5727 | { | |
5728 | idx = TEMPLATE_TYPE_IDX (t); | |
5729 | level = TEMPLATE_TYPE_LEVEL (t); | |
5730 | } | |
5731 | else | |
5732 | { | |
5733 | idx = TEMPLATE_PARM_IDX (t); | |
5734 | level = TEMPLATE_PARM_LEVEL (t); | |
5735 | } | |
5736 | ||
5737 | if (TREE_VEC_LENGTH (args) > 0) | |
5738 | { | |
5739 | tree arg = NULL_TREE; | |
5740 | ||
5741 | levels = TMPL_ARGS_DEPTH (args); | |
5742 | if (level <= levels) | |
5743 | arg = TMPL_ARG (args, level, idx); | |
5744 | ||
8b5b8b7c MM |
5745 | if (arg == error_mark_node) |
5746 | return error_mark_node; | |
5747 | else if (arg != NULL_TREE) | |
ae58fa02 MM |
5748 | { |
5749 | if (TREE_CODE (t) == TEMPLATE_TYPE_PARM) | |
5750 | { | |
5751 | my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (arg)) | |
5752 | == 't', 0); | |
91063b51 MM |
5753 | return cp_build_qualified_type |
5754 | (arg, CP_TYPE_QUALS (arg) | CP_TYPE_QUALS (t)); | |
ae58fa02 MM |
5755 | } |
5756 | else if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM) | |
5757 | { | |
7ddedda4 | 5758 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t)) |
ae58fa02 MM |
5759 | { |
5760 | /* We are processing a type constructed from | |
5761 | a template template parameter */ | |
7ddedda4 | 5762 | tree argvec = tsubst (TYPE_TI_ARGS (t), |
ae58fa02 | 5763 | args, in_decl); |
ae58fa02 MM |
5764 | |
5765 | /* We can get a TEMPLATE_TEMPLATE_PARM here when | |
5766 | we are resolving nested-types in the signature of | |
5767 | a member function templates. | |
5768 | Otherwise ARG is a TEMPLATE_DECL and is the real | |
5769 | template to be instantiated. */ | |
5770 | if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
5771 | arg = TYPE_NAME (arg); | |
5772 | ||
5773 | r = lookup_template_class (DECL_NAME (arg), | |
5774 | argvec, in_decl, | |
5775 | DECL_CONTEXT (arg), | |
5776 | /*entering_scope=*/0); | |
91063b51 | 5777 | return cp_build_qualified_type (r, TYPE_QUALS (t)); |
ae58fa02 MM |
5778 | } |
5779 | else | |
5780 | /* We are processing a template argument list. */ | |
5781 | return arg; | |
5782 | } | |
5783 | else | |
5784 | return arg; | |
5785 | } | |
5786 | } | |
51924768 JM |
5787 | else |
5788 | my_friendly_abort (981018); | |
ae58fa02 MM |
5789 | |
5790 | if (level == 1) | |
5791 | /* This can happen during the attempted tsubst'ing in | |
5792 | unify. This means that we don't yet have any information | |
5793 | about the template parameter in question. */ | |
5794 | return t; | |
5795 | ||
5796 | /* If we get here, we must have been looking at a parm for a | |
5797 | more deeply nested template. Make a new version of this | |
5798 | template parameter, but with a lower level. */ | |
5799 | switch (TREE_CODE (t)) | |
5800 | { | |
5801 | case TEMPLATE_TYPE_PARM: | |
5802 | case TEMPLATE_TEMPLATE_PARM: | |
5803 | r = copy_node (t); | |
5804 | TEMPLATE_TYPE_PARM_INDEX (r) | |
5805 | = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t), | |
5806 | r, levels); | |
5807 | TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r); | |
5808 | TYPE_MAIN_VARIANT (r) = r; | |
5809 | TYPE_POINTER_TO (r) = NULL_TREE; | |
5810 | TYPE_REFERENCE_TO (r) = NULL_TREE; | |
5811 | ||
5812 | if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM | |
7ddedda4 | 5813 | && TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t)) |
ae58fa02 | 5814 | { |
7ddedda4 MM |
5815 | tree argvec = tsubst (TYPE_TI_ARGS (t), args, in_decl); |
5816 | TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r) | |
ae58fa02 MM |
5817 | = perm_tree_cons (TYPE_NAME (t), argvec, NULL_TREE); |
5818 | } | |
5819 | break; | |
5820 | ||
5821 | case TEMPLATE_PARM_INDEX: | |
5822 | r = reduce_template_parm_level (t, type, levels); | |
5823 | break; | |
5824 | ||
5825 | default: | |
5826 | my_friendly_abort (0); | |
5827 | } | |
5828 | ||
5566b478 | 5829 | return r; |
ae58fa02 | 5830 | } |
5566b478 | 5831 | |
8d08fdba MS |
5832 | case TREE_LIST: |
5833 | { | |
5834 | tree purpose, value, chain, result; | |
5835 | int via_public, via_virtual, via_protected; | |
5836 | ||
5837 | if (t == void_list_node) | |
5838 | return t; | |
5839 | ||
5840 | via_public = TREE_VIA_PUBLIC (t); | |
5841 | via_protected = TREE_VIA_PROTECTED (t); | |
5842 | via_virtual = TREE_VIA_VIRTUAL (t); | |
5843 | ||
5844 | purpose = TREE_PURPOSE (t); | |
5845 | if (purpose) | |
f7d98d58 | 5846 | purpose = tsubst (purpose, args, in_decl); |
8d08fdba MS |
5847 | value = TREE_VALUE (t); |
5848 | if (value) | |
f7d98d58 | 5849 | value = tsubst (value, args, in_decl); |
8d08fdba MS |
5850 | chain = TREE_CHAIN (t); |
5851 | if (chain && chain != void_type_node) | |
f7d98d58 | 5852 | chain = tsubst (chain, args, in_decl); |
8d08fdba MS |
5853 | if (purpose == TREE_PURPOSE (t) |
5854 | && value == TREE_VALUE (t) | |
5855 | && chain == TREE_CHAIN (t)) | |
5856 | return t; | |
5857 | result = hash_tree_cons (via_public, via_virtual, via_protected, | |
5858 | purpose, value, chain); | |
5859 | TREE_PARMLIST (result) = TREE_PARMLIST (t); | |
5860 | return result; | |
5861 | } | |
5862 | case TREE_VEC: | |
5566b478 MS |
5863 | if (type != NULL_TREE) |
5864 | { | |
1ceaad38 JM |
5865 | /* A binfo node. We always need to make a copy, of the node |
5866 | itself and of its BINFO_BASETYPES. */ | |
85b71cf2 | 5867 | |
5566b478 MS |
5868 | t = copy_node (t); |
5869 | ||
c7449f2b JM |
5870 | /* Make sure type isn't a typedef copy. */ |
5871 | type = BINFO_TYPE (TYPE_BINFO (type)); | |
5872 | ||
5566b478 | 5873 | TREE_TYPE (t) = complete_type (type); |
6633d636 MS |
5874 | if (IS_AGGR_TYPE (type)) |
5875 | { | |
5876 | BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (type); | |
5877 | BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (type); | |
5878 | if (TYPE_BINFO_BASETYPES (type) != NULL_TREE) | |
5879 | BINFO_BASETYPES (t) = copy_node (TYPE_BINFO_BASETYPES (type)); | |
5880 | } | |
5566b478 MS |
5881 | return t; |
5882 | } | |
85b71cf2 JM |
5883 | |
5884 | /* Otherwise, a vector of template arguments. */ | |
830bfa74 | 5885 | return tsubst_template_arg_vector (t, args); |
8d08fdba | 5886 | |
8d08fdba MS |
5887 | case POINTER_TYPE: |
5888 | case REFERENCE_TYPE: | |
5889 | { | |
8d08fdba | 5890 | enum tree_code code; |
79a7c7fa | 5891 | |
8d08fdba MS |
5892 | if (type == TREE_TYPE (t)) |
5893 | return t; | |
5894 | ||
5895 | code = TREE_CODE (t); | |
0ecfe0b4 JM |
5896 | if (TREE_CODE (type) == REFERENCE_TYPE |
5897 | || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE)) | |
79a7c7fa JM |
5898 | { |
5899 | static int last_line = 0; | |
5900 | static char* last_file = 0; | |
5901 | ||
5902 | /* We keep track of the last time we issued this error | |
5903 | message to avoid spewing a ton of messages during a | |
5904 | single bad template instantiation. */ | |
5905 | if (last_line != lineno || | |
5906 | last_file != input_filename) | |
5907 | { | |
0ecfe0b4 JM |
5908 | if (TREE_CODE (type) == VOID_TYPE) |
5909 | cp_error ("forming reference to void"); | |
5910 | else | |
5911 | cp_error ("forming %s to reference type `%T'", | |
5912 | (code == POINTER_TYPE) ? "pointer" : "reference", | |
5913 | type); | |
79a7c7fa JM |
5914 | last_line = lineno; |
5915 | last_file = input_filename; | |
5916 | } | |
5917 | ||
5918 | /* Use the underlying type in an attempt at error | |
5919 | recovery; maybe the user meant vector<int> and wrote | |
5920 | vector<int&>, or some such. */ | |
5921 | if (code == REFERENCE_TYPE) | |
5922 | r = type; | |
5923 | else | |
5924 | r = build_pointer_type (TREE_TYPE (type)); | |
5925 | } | |
5926 | else if (code == POINTER_TYPE) | |
8d08fdba MS |
5927 | r = build_pointer_type (type); |
5928 | else | |
5929 | r = build_reference_type (type); | |
91063b51 | 5930 | r = cp_build_qualified_type (r, TYPE_QUALS (t)); |
79a7c7fa | 5931 | |
8d08fdba MS |
5932 | /* Will this ever be needed for TYPE_..._TO values? */ |
5933 | layout_type (r); | |
5934 | return r; | |
5935 | } | |
a4443a08 | 5936 | case OFFSET_TYPE: |
0ecfe0b4 JM |
5937 | { |
5938 | r = tsubst (TYPE_OFFSET_BASETYPE (t), args, in_decl); | |
5939 | if (! IS_AGGR_TYPE (r)) | |
5940 | cp_error ("creating pointer to member of non-class type `%T'", r); | |
5941 | return build_offset_type (r, type); | |
5942 | } | |
8d08fdba MS |
5943 | case FUNCTION_TYPE: |
5944 | case METHOD_TYPE: | |
5945 | { | |
cabc336a MM |
5946 | tree arg_types; |
5947 | tree raises; | |
c11b6f21 | 5948 | tree fntype; |
8d08fdba | 5949 | |
cabc336a MM |
5950 | /* The TYPE_CONTEXT is not used for function/method types. */ |
5951 | my_friendly_assert (TYPE_CONTEXT (t) == NULL_TREE, 0); | |
5952 | ||
5953 | /* Substitue the argument types. */ | |
5954 | arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args, in_decl); | |
8d08fdba MS |
5955 | |
5956 | /* Construct a new type node and return it. */ | |
cabc336a MM |
5957 | if (TREE_CODE (t) == FUNCTION_TYPE) |
5958 | fntype = build_function_type (type, arg_types); | |
0ecfe0b4 JM |
5959 | else |
5960 | { | |
5961 | r = TREE_TYPE (TREE_VALUE (arg_types)); | |
5962 | if (! IS_AGGR_TYPE (r)) | |
5963 | cp_error ("creating pointer to member function of non-class type `%T'", | |
5964 | r); | |
5965 | ||
5966 | fntype = build_cplus_method_type (r, type, TREE_CHAIN (arg_types)); | |
5967 | } | |
91063b51 | 5968 | fntype = build_qualified_type (fntype, TYPE_QUALS (t)); |
cabc336a MM |
5969 | |
5970 | /* Substitue the exception specification. */ | |
5971 | raises = TYPE_RAISES_EXCEPTIONS (t); | |
c11b6f21 MS |
5972 | if (raises) |
5973 | { | |
f7d98d58 | 5974 | raises = tsubst (raises, args, in_decl); |
c11b6f21 MS |
5975 | fntype = build_exception_variant (fntype, raises); |
5976 | } | |
5977 | return fntype; | |
8d08fdba MS |
5978 | } |
5979 | case ARRAY_TYPE: | |
5980 | { | |
f7d98d58 | 5981 | tree domain = tsubst (TYPE_DOMAIN (t), args, in_decl); |
8d08fdba MS |
5982 | if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) |
5983 | return t; | |
0ecfe0b4 JM |
5984 | |
5985 | /* These checks should match the ones in grokdeclarator. */ | |
5986 | if (TREE_CODE (type) == VOID_TYPE) | |
5987 | { | |
5988 | cp_error ("creating array of void"); | |
5989 | type = build_pointer_type (type); | |
5990 | } | |
5991 | else if (TREE_CODE (type) == FUNCTION_TYPE) | |
5992 | { | |
5993 | cp_error ("creating array of functions `%T'", type); | |
5994 | type = build_pointer_type (type); | |
5995 | } | |
5996 | else if (TREE_CODE (type) == REFERENCE_TYPE) | |
5997 | { | |
5998 | cp_error ("creating array of references `%T'", type); | |
5999 | type = TREE_TYPE (type); | |
6000 | } | |
6001 | ||
8d08fdba MS |
6002 | r = build_cplus_array_type (type, domain); |
6003 | return r; | |
6004 | } | |
6005 | ||
8d08fdba | 6006 | case PLUS_EXPR: |
5566b478 | 6007 | case MINUS_EXPR: |
8d08fdba | 6008 | return fold (build (TREE_CODE (t), TREE_TYPE (t), |
f7d98d58 JM |
6009 | tsubst (TREE_OPERAND (t, 0), args, in_decl), |
6010 | tsubst (TREE_OPERAND (t, 1), args, in_decl))); | |
8d08fdba MS |
6011 | |
6012 | case NEGATE_EXPR: | |
6013 | case NOP_EXPR: | |
6014 | return fold (build1 (TREE_CODE (t), TREE_TYPE (t), | |
f7d98d58 | 6015 | tsubst (TREE_OPERAND (t, 0), args, in_decl))); |
8d08fdba | 6016 | |
5566b478 MS |
6017 | case TYPENAME_TYPE: |
6018 | { | |
36a117a5 MM |
6019 | tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, in_decl, |
6020 | /*entering_scope=*/1); | |
b2b7d40a | 6021 | tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args, in_decl); |
ae58fa02 MM |
6022 | |
6023 | /* Normally, make_typename_type does not require that the CTX | |
6024 | have complete type in order to allow things like: | |
6025 | ||
6026 | template <class T> struct S { typename S<T>::X Y; }; | |
6027 | ||
6028 | But, such constructs have already been resolved by this | |
6029 | point, so here CTX really should have complete type, unless | |
6030 | it's a partial instantiation. */ | |
6031 | if (!uses_template_parms (ctx) | |
6032 | && !complete_type_or_else (ctx)) | |
6033 | return error_mark_node; | |
6034 | ||
b2b7d40a | 6035 | f = make_typename_type (ctx, f); |
91063b51 MM |
6036 | return cp_build_qualified_type (f, |
6037 | CP_TYPE_QUALS (f) | |
6038 | | CP_TYPE_QUALS (t)); | |
5566b478 MS |
6039 | } |
6040 | ||
6041 | case INDIRECT_REF: | |
6042 | return make_pointer_declarator | |
f7d98d58 | 6043 | (type, tsubst (TREE_OPERAND (t, 0), args, in_decl)); |
5566b478 MS |
6044 | |
6045 | case ADDR_EXPR: | |
6046 | return make_reference_declarator | |
f7d98d58 | 6047 | (type, tsubst (TREE_OPERAND (t, 0), args, in_decl)); |
5566b478 MS |
6048 | |
6049 | case ARRAY_REF: | |
6050 | return build_parse_node | |
f7d98d58 JM |
6051 | (ARRAY_REF, tsubst (TREE_OPERAND (t, 0), args, in_decl), |
6052 | tsubst_expr (TREE_OPERAND (t, 1), args, in_decl)); | |
5566b478 MS |
6053 | |
6054 | case CALL_EXPR: | |
c11b6f21 | 6055 | return make_call_declarator |
f7d98d58 JM |
6056 | (tsubst (TREE_OPERAND (t, 0), args, in_decl), |
6057 | tsubst (TREE_OPERAND (t, 1), args, in_decl), | |
c11b6f21 | 6058 | TREE_OPERAND (t, 2), |
f7d98d58 | 6059 | tsubst (TREE_TYPE (t), args, in_decl)); |
5566b478 | 6060 | |
fc378698 MS |
6061 | case SCOPE_REF: |
6062 | return build_parse_node | |
f7d98d58 JM |
6063 | (TREE_CODE (t), tsubst (TREE_OPERAND (t, 0), args, in_decl), |
6064 | tsubst (TREE_OPERAND (t, 1), args, in_decl)); | |
fc378698 | 6065 | |
b894fc05 JM |
6066 | case TYPEOF_TYPE: |
6067 | return TREE_TYPE (tsubst_expr (TYPE_FIELDS (t), args, in_decl)); | |
6068 | ||
8d08fdba | 6069 | default: |
5566b478 | 6070 | sorry ("use of `%s' in template", |
8d08fdba MS |
6071 | tree_code_name [(int) TREE_CODE (t)]); |
6072 | return error_mark_node; | |
6073 | } | |
6074 | } | |
6075 | ||
5566b478 MS |
6076 | void |
6077 | do_pushlevel () | |
6078 | { | |
6079 | emit_line_note (input_filename, lineno); | |
6080 | pushlevel (0); | |
6081 | clear_last_expr (); | |
6082 | push_momentary (); | |
6083 | expand_start_bindings (0); | |
6084 | } | |
6085 | ||
8d08fdba | 6086 | tree |
5566b478 | 6087 | do_poplevel () |
8d08fdba | 6088 | { |
5566b478 | 6089 | tree t; |
a703fb38 | 6090 | int saved_warn_unused = 0; |
8d08fdba | 6091 | |
85b71cf2 JM |
6092 | if (processing_template_decl) |
6093 | { | |
6094 | saved_warn_unused = warn_unused; | |
6095 | warn_unused = 0; | |
6096 | } | |
8baa713c | 6097 | expand_end_bindings (getdecls (), kept_level_p (), 0); |
85b71cf2 JM |
6098 | if (processing_template_decl) |
6099 | warn_unused = saved_warn_unused; | |
5566b478 MS |
6100 | t = poplevel (kept_level_p (), 1, 0); |
6101 | pop_momentary (); | |
6102 | return t; | |
6103 | } | |
8d08fdba | 6104 | |
00d3396f JM |
6105 | /* Like tsubst, but deals with expressions. This function just replaces |
6106 | template parms; to finish processing the resultant expression, use | |
6107 | tsubst_expr. */ | |
6108 | ||
5566b478 | 6109 | tree |
f7d98d58 | 6110 | tsubst_copy (t, args, in_decl) |
98c1c668 | 6111 | tree t, args; |
5566b478 MS |
6112 | tree in_decl; |
6113 | { | |
6114 | enum tree_code code; | |
8452b1d3 | 6115 | tree r; |
8d08fdba | 6116 | |
5566b478 MS |
6117 | if (t == NULL_TREE || t == error_mark_node) |
6118 | return t; | |
6119 | ||
6120 | code = TREE_CODE (t); | |
b7484fbe | 6121 | |
5566b478 MS |
6122 | switch (code) |
6123 | { | |
6124 | case PARM_DECL: | |
a759e627 | 6125 | return do_identifier (DECL_NAME (t), 0, NULL_TREE); |
5566b478 MS |
6126 | |
6127 | case CONST_DECL: | |
ed44da02 MM |
6128 | { |
6129 | tree enum_type; | |
6130 | tree v; | |
6131 | ||
6132 | if (!DECL_CONTEXT (t)) | |
6133 | /* This is a global enumeration constant. */ | |
6134 | return t; | |
6135 | ||
6136 | /* Unfortunately, we cannot just call lookup_name here. | |
6137 | Consider: | |
6138 | ||
6139 | template <int I> int f() { | |
6140 | enum E { a = I }; | |
6141 | struct S { void g() { E e = a; } }; | |
6142 | }; | |
6143 | ||
6144 | When we instantiate f<7>::S::g(), say, lookup_name is not | |
6145 | clever enough to find f<7>::a. */ | |
6146 | enum_type | |
6147 | = tsubst_aggr_type (TREE_TYPE (t), args, in_decl, | |
6148 | /*entering_scope=*/0); | |
6149 | ||
6150 | for (v = TYPE_VALUES (enum_type); | |
6151 | v != NULL_TREE; | |
6152 | v = TREE_CHAIN (v)) | |
6153 | if (TREE_PURPOSE (v) == DECL_NAME (t)) | |
6154 | return TREE_VALUE (v); | |
6155 | ||
6156 | /* We didn't find the name. That should never happen; if | |
6157 | name-lookup found it during preliminary parsing, we | |
6158 | should find it again here during instantiation. */ | |
6159 | my_friendly_abort (0); | |
6160 | } | |
db04386f | 6161 | return t; |
ed44da02 | 6162 | |
5566b478 MS |
6163 | case FIELD_DECL: |
6164 | if (DECL_CONTEXT (t)) | |
6165 | { | |
0978790f | 6166 | tree ctx; |
0978790f | 6167 | |
36a117a5 MM |
6168 | ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, in_decl, |
6169 | /*entering_scope=*/1); | |
0978790f | 6170 | if (ctx != DECL_CONTEXT (t)) |
5566b478 MS |
6171 | return lookup_field (ctx, DECL_NAME (t), 0, 0); |
6172 | } | |
6173 | return t; | |
6174 | ||
6175 | case VAR_DECL: | |
6176 | case FUNCTION_DECL: | |
6177 | if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)) | |
f7d98d58 | 6178 | t = tsubst (t, args, in_decl); |
5566b478 MS |
6179 | mark_used (t); |
6180 | return t; | |
6181 | ||
98c1c668 JM |
6182 | case TEMPLATE_DECL: |
6183 | if (is_member_template (t)) | |
f7d98d58 | 6184 | return tsubst (t, args, in_decl); |
98c1c668 JM |
6185 | else |
6186 | return t; | |
6187 | ||
672476cb MM |
6188 | case LOOKUP_EXPR: |
6189 | { | |
6190 | /* We must tsbust into a LOOKUP_EXPR in case the names to | |
6191 | which it refers is a conversion operator; in that case the | |
6192 | name will change. We avoid making unnecessary copies, | |
6193 | however. */ | |
6194 | ||
6195 | tree id = tsubst_copy (TREE_OPERAND (t, 0), args, in_decl); | |
6196 | ||
6197 | if (id != TREE_OPERAND (t, 0)) | |
6198 | { | |
8452b1d3 | 6199 | r = build_nt (LOOKUP_EXPR, id); |
672476cb MM |
6200 | LOOKUP_EXPR_GLOBAL (r) = LOOKUP_EXPR_GLOBAL (t); |
6201 | t = r; | |
6202 | } | |
6203 | ||
6204 | return t; | |
6205 | } | |
6206 | ||
5566b478 MS |
6207 | case CAST_EXPR: |
6208 | case REINTERPRET_CAST_EXPR: | |
e92cc029 MS |
6209 | case CONST_CAST_EXPR: |
6210 | case STATIC_CAST_EXPR: | |
6211 | case DYNAMIC_CAST_EXPR: | |
51924768 | 6212 | case NOP_EXPR: |
5566b478 | 6213 | return build1 |
f7d98d58 JM |
6214 | (code, tsubst (TREE_TYPE (t), args, in_decl), |
6215 | tsubst_copy (TREE_OPERAND (t, 0), args, in_decl)); | |
5566b478 MS |
6216 | |
6217 | case INDIRECT_REF: | |
6218 | case PREDECREMENT_EXPR: | |
6219 | case PREINCREMENT_EXPR: | |
6220 | case POSTDECREMENT_EXPR: | |
6221 | case POSTINCREMENT_EXPR: | |
6222 | case NEGATE_EXPR: | |
6223 | case TRUTH_NOT_EXPR: | |
b87692e5 | 6224 | case BIT_NOT_EXPR: |
5566b478 MS |
6225 | case ADDR_EXPR: |
6226 | case CONVERT_EXPR: /* Unary + */ | |
6227 | case SIZEOF_EXPR: | |
abff8e06 | 6228 | case ALIGNOF_EXPR: |
5566b478 | 6229 | case ARROW_EXPR: |
fc378698 | 6230 | case THROW_EXPR: |
5156628f | 6231 | case TYPEID_EXPR: |
5566b478 MS |
6232 | return build1 |
6233 | (code, NULL_TREE, | |
f7d98d58 | 6234 | tsubst_copy (TREE_OPERAND (t, 0), args, in_decl)); |
5566b478 MS |
6235 | |
6236 | case PLUS_EXPR: | |
6237 | case MINUS_EXPR: | |
6238 | case MULT_EXPR: | |
6239 | case TRUNC_DIV_EXPR: | |
6240 | case CEIL_DIV_EXPR: | |
6241 | case FLOOR_DIV_EXPR: | |
6242 | case ROUND_DIV_EXPR: | |
6243 | case EXACT_DIV_EXPR: | |
6244 | case BIT_AND_EXPR: | |
6245 | case BIT_ANDTC_EXPR: | |
6246 | case BIT_IOR_EXPR: | |
6247 | case BIT_XOR_EXPR: | |
6248 | case TRUNC_MOD_EXPR: | |
6249 | case FLOOR_MOD_EXPR: | |
6250 | case TRUTH_ANDIF_EXPR: | |
6251 | case TRUTH_ORIF_EXPR: | |
6252 | case TRUTH_AND_EXPR: | |
6253 | case TRUTH_OR_EXPR: | |
6254 | case RSHIFT_EXPR: | |
6255 | case LSHIFT_EXPR: | |
6256 | case RROTATE_EXPR: | |
6257 | case LROTATE_EXPR: | |
6258 | case EQ_EXPR: | |
6259 | case NE_EXPR: | |
6260 | case MAX_EXPR: | |
6261 | case MIN_EXPR: | |
6262 | case LE_EXPR: | |
6263 | case GE_EXPR: | |
6264 | case LT_EXPR: | |
6265 | case GT_EXPR: | |
6266 | case COMPONENT_REF: | |
6267 | case ARRAY_REF: | |
6268 | case COMPOUND_EXPR: | |
6269 | case SCOPE_REF: | |
6270 | case DOTSTAR_EXPR: | |
6271 | case MEMBER_REF: | |
6272 | return build_nt | |
f7d98d58 JM |
6273 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, in_decl), |
6274 | tsubst_copy (TREE_OPERAND (t, 1), args, in_decl)); | |
5566b478 MS |
6275 | |
6276 | case CALL_EXPR: | |
6277 | { | |
6278 | tree fn = TREE_OPERAND (t, 0); | |
f84b4be9 | 6279 | if (is_overloaded_fn (fn)) |
f7d98d58 | 6280 | fn = tsubst_copy (get_first_fn (fn), args, in_decl); |
5566b478 | 6281 | else |
f84b4be9 | 6282 | /* Sometimes FN is a LOOKUP_EXPR. */ |
f7d98d58 | 6283 | fn = tsubst_copy (fn, args, in_decl); |
5566b478 | 6284 | return build_nt |
f7d98d58 | 6285 | (code, fn, tsubst_copy (TREE_OPERAND (t, 1), args, in_decl), |
5566b478 MS |
6286 | NULL_TREE); |
6287 | } | |
6288 | ||
6289 | case METHOD_CALL_EXPR: | |
6290 | { | |
6291 | tree name = TREE_OPERAND (t, 0); | |
6292 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
6293 | { | |
f7d98d58 | 6294 | name = tsubst_copy (TREE_OPERAND (name, 0), args, in_decl); |
7bae46f4 | 6295 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6296 | } |
6297 | else if (TREE_CODE (name) == SCOPE_REF | |
6298 | && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR) | |
6299 | { | |
f7d98d58 | 6300 | tree base = tsubst_copy (TREE_OPERAND (name, 0), args, in_decl); |
5566b478 | 6301 | name = TREE_OPERAND (name, 1); |
f7d98d58 | 6302 | name = tsubst_copy (TREE_OPERAND (name, 0), args, in_decl); |
11686454 | 6303 | name = build1 (BIT_NOT_EXPR, NULL_TREE, name); |
5566b478 MS |
6304 | name = build_nt (SCOPE_REF, base, name); |
6305 | } | |
6306 | else | |
f7d98d58 | 6307 | name = tsubst_copy (TREE_OPERAND (t, 0), args, in_decl); |
5566b478 | 6308 | return build_nt |
f7d98d58 JM |
6309 | (code, name, tsubst_copy (TREE_OPERAND (t, 1), args, in_decl), |
6310 | tsubst_copy (TREE_OPERAND (t, 2), args, in_decl), | |
5566b478 MS |
6311 | NULL_TREE); |
6312 | } | |
6313 | ||
67da3287 | 6314 | case BIND_EXPR: |
5566b478 MS |
6315 | case COND_EXPR: |
6316 | case MODOP_EXPR: | |
67da3287 | 6317 | { |
8452b1d3 | 6318 | r = build_nt |
f7d98d58 JM |
6319 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, in_decl), |
6320 | tsubst_copy (TREE_OPERAND (t, 1), args, in_decl), | |
6321 | tsubst_copy (TREE_OPERAND (t, 2), args, in_decl)); | |
67da3287 MM |
6322 | |
6323 | if (code == BIND_EXPR && !processing_template_decl) | |
6324 | { | |
6325 | /* This processing should really occur in tsubst_expr, | |
6326 | However, tsubst_expr does not recurse into expressions, | |
6327 | since it assumes that there aren't any statements | |
6328 | inside them. Instead, it simply calls | |
6329 | build_expr_from_tree. So, we need to expand the | |
6330 | BIND_EXPR here. */ | |
b4c4a9ec | 6331 | tree rtl_expr = begin_stmt_expr (); |
544c188d | 6332 | tree block = tsubst_expr (TREE_OPERAND (r, 1), args, in_decl); |
b4c4a9ec | 6333 | r = finish_stmt_expr (rtl_expr, block); |
67da3287 MM |
6334 | } |
6335 | ||
6336 | return r; | |
6337 | } | |
5566b478 MS |
6338 | |
6339 | case NEW_EXPR: | |
6340 | { | |
8452b1d3 | 6341 | r = build_nt |
f7d98d58 JM |
6342 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, in_decl), |
6343 | tsubst_copy (TREE_OPERAND (t, 1), args, in_decl), | |
6344 | tsubst_copy (TREE_OPERAND (t, 2), args, in_decl)); | |
5566b478 MS |
6345 | NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t); |
6346 | return r; | |
6347 | } | |
6348 | ||
6349 | case DELETE_EXPR: | |
6350 | { | |
8452b1d3 | 6351 | r = build_nt |
f7d98d58 JM |
6352 | (code, tsubst_copy (TREE_OPERAND (t, 0), args, in_decl), |
6353 | tsubst_copy (TREE_OPERAND (t, 1), args, in_decl)); | |
5566b478 MS |
6354 | DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t); |
6355 | DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t); | |
6356 | return r; | |
6357 | } | |
6358 | ||
386b8a85 JM |
6359 | case TEMPLATE_ID_EXPR: |
6360 | { | |
00d3396f | 6361 | /* Substituted template arguments */ |
f7d98d58 | 6362 | tree targs = tsubst_copy (TREE_OPERAND (t, 1), args, in_decl); |
00d3396f JM |
6363 | tree chain; |
6364 | for (chain = targs; chain; chain = TREE_CHAIN (chain)) | |
6365 | TREE_VALUE (chain) = maybe_fold_nontype_arg (TREE_VALUE (chain)); | |
6366 | ||
6367 | return lookup_template_function | |
f7d98d58 | 6368 | (tsubst_copy (TREE_OPERAND (t, 0), args, in_decl), targs); |
386b8a85 JM |
6369 | } |
6370 | ||
5566b478 MS |
6371 | case TREE_LIST: |
6372 | { | |
6373 | tree purpose, value, chain; | |
6374 | ||
6375 | if (t == void_list_node) | |
6376 | return t; | |
6377 | ||
6378 | purpose = TREE_PURPOSE (t); | |
6379 | if (purpose) | |
f7d98d58 | 6380 | purpose = tsubst_copy (purpose, args, in_decl); |
5566b478 MS |
6381 | value = TREE_VALUE (t); |
6382 | if (value) | |
f7d98d58 | 6383 | value = tsubst_copy (value, args, in_decl); |
5566b478 MS |
6384 | chain = TREE_CHAIN (t); |
6385 | if (chain && chain != void_type_node) | |
f7d98d58 | 6386 | chain = tsubst_copy (chain, args, in_decl); |
5566b478 MS |
6387 | if (purpose == TREE_PURPOSE (t) |
6388 | && value == TREE_VALUE (t) | |
6389 | && chain == TREE_CHAIN (t)) | |
6390 | return t; | |
6391 | return tree_cons (purpose, value, chain); | |
6392 | } | |
6393 | ||
6394 | case RECORD_TYPE: | |
6395 | case UNION_TYPE: | |
6396 | case ENUMERAL_TYPE: | |
6397 | case INTEGER_TYPE: | |
6398 | case TEMPLATE_TYPE_PARM: | |
73b0fce8 | 6399 | case TEMPLATE_TEMPLATE_PARM: |
f84b4be9 | 6400 | case TEMPLATE_PARM_INDEX: |
5566b478 MS |
6401 | case POINTER_TYPE: |
6402 | case REFERENCE_TYPE: | |
6403 | case OFFSET_TYPE: | |
6404 | case FUNCTION_TYPE: | |
6405 | case METHOD_TYPE: | |
6406 | case ARRAY_TYPE: | |
6407 | case TYPENAME_TYPE: | |
f84b4be9 | 6408 | case TYPE_DECL: |
f7d98d58 | 6409 | return tsubst (t, args, in_decl); |
5566b478 | 6410 | |
e92cc029 | 6411 | case IDENTIFIER_NODE: |
8e710788 BK |
6412 | if (IDENTIFIER_TYPENAME_P (t) |
6413 | /* Make sure it's not just a variable named `__opr', for instance, | |
6414 | which can occur in some existing code. */ | |
6415 | && TREE_TYPE (t)) | |
e92cc029 | 6416 | return build_typename_overload |
f7d98d58 | 6417 | (tsubst (TREE_TYPE (t), args, in_decl)); |
e92cc029 MS |
6418 | else |
6419 | return t; | |
6420 | ||
5156628f | 6421 | case CONSTRUCTOR: |
8452b1d3 JM |
6422 | { |
6423 | r = build | |
6424 | (CONSTRUCTOR, tsubst (TREE_TYPE (t), args, in_decl), NULL_TREE, | |
6425 | tsubst_copy (CONSTRUCTOR_ELTS (t), args, in_decl)); | |
6426 | TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t); | |
6427 | return r; | |
6428 | } | |
5156628f | 6429 | |
5566b478 MS |
6430 | default: |
6431 | return t; | |
6432 | } | |
6433 | } | |
6434 | ||
00d3396f JM |
6435 | /* Like tsubst_copy, but also does semantic processing and RTL expansion. */ |
6436 | ||
5566b478 | 6437 | tree |
f7d98d58 | 6438 | tsubst_expr (t, args, in_decl) |
98c1c668 | 6439 | tree t, args; |
5566b478 MS |
6440 | tree in_decl; |
6441 | { | |
6442 | if (t == NULL_TREE || t == error_mark_node) | |
6443 | return t; | |
6444 | ||
5156628f | 6445 | if (processing_template_decl) |
f7d98d58 | 6446 | return tsubst_copy (t, args, in_decl); |
5566b478 MS |
6447 | |
6448 | switch (TREE_CODE (t)) | |
8d08fdba | 6449 | { |
5566b478 MS |
6450 | case RETURN_STMT: |
6451 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6452 | finish_return_stmt (tsubst_expr (RETURN_EXPR (t), |
6453 | args, in_decl)); | |
5566b478 MS |
6454 | break; |
6455 | ||
6456 | case EXPR_STMT: | |
6457 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6458 | finish_expr_stmt (tsubst_expr (EXPR_STMT_EXPR (t), |
6459 | args, in_decl)); | |
5566b478 MS |
6460 | break; |
6461 | ||
6462 | case DECL_STMT: | |
6463 | { | |
6464 | int i = suspend_momentary (); | |
67d743fe | 6465 | tree dcl, init; |
5566b478 MS |
6466 | |
6467 | lineno = TREE_COMPLEXITY (t); | |
6468 | emit_line_note (input_filename, lineno); | |
6469 | dcl = start_decl | |
f7d98d58 JM |
6470 | (tsubst (TREE_OPERAND (t, 0), args, in_decl), |
6471 | tsubst (TREE_OPERAND (t, 1), args, in_decl), | |
a1774733 | 6472 | TREE_OPERAND (t, 2) != 0, NULL_TREE, NULL_TREE); |
f7d98d58 | 6473 | init = tsubst_expr (TREE_OPERAND (t, 2), args, in_decl); |
5566b478 | 6474 | cp_finish_decl |
a0128b67 | 6475 | (dcl, init, NULL_TREE, 1, /*init ? LOOKUP_ONLYCONVERTING :*/ 0); |
5566b478 MS |
6476 | resume_momentary (i); |
6477 | return dcl; | |
6478 | } | |
8d08fdba | 6479 | |
5566b478 MS |
6480 | case FOR_STMT: |
6481 | { | |
6482 | tree tmp; | |
5566b478 | 6483 | lineno = TREE_COMPLEXITY (t); |
5566b478 | 6484 | |
ad321293 MM |
6485 | begin_for_stmt (); |
6486 | for (tmp = FOR_INIT_STMT (t); tmp; tmp = TREE_CHAIN (tmp)) | |
6487 | tsubst_expr (tmp, args, in_decl); | |
6488 | finish_for_init_stmt (NULL_TREE); | |
6489 | finish_for_cond (tsubst_expr (FOR_COND (t), args, | |
6490 | in_decl), | |
6491 | NULL_TREE); | |
6492 | tmp = tsubst_expr (FOR_EXPR (t), args, in_decl); | |
6493 | finish_for_expr (tmp, NULL_TREE); | |
6494 | tsubst_expr (FOR_BODY (t), args, in_decl); | |
6495 | finish_for_stmt (tmp, NULL_TREE); | |
5566b478 MS |
6496 | } |
6497 | break; | |
8d08fdba | 6498 | |
5566b478 MS |
6499 | case WHILE_STMT: |
6500 | { | |
5566b478 | 6501 | lineno = TREE_COMPLEXITY (t); |
ad321293 MM |
6502 | begin_while_stmt (); |
6503 | finish_while_stmt_cond (tsubst_expr (WHILE_COND (t), | |
6504 | args, in_decl), | |
6505 | NULL_TREE); | |
6506 | tsubst_expr (WHILE_BODY (t), args, in_decl); | |
6507 | finish_while_stmt (NULL_TREE); | |
5566b478 MS |
6508 | } |
6509 | break; | |
8d08fdba | 6510 | |
5566b478 MS |
6511 | case DO_STMT: |
6512 | { | |
5566b478 | 6513 | lineno = TREE_COMPLEXITY (t); |
ad321293 MM |
6514 | begin_do_stmt (); |
6515 | tsubst_expr (DO_BODY (t), args, in_decl); | |
6516 | finish_do_body (NULL_TREE); | |
6517 | finish_do_stmt (tsubst_expr (DO_COND (t), args, | |
6518 | in_decl), | |
6519 | NULL_TREE); | |
5566b478 MS |
6520 | } |
6521 | break; | |
a0a33927 | 6522 | |
5566b478 | 6523 | case IF_STMT: |
8d08fdba | 6524 | { |
5566b478 | 6525 | tree tmp; |
5566b478 MS |
6526 | |
6527 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6528 | begin_if_stmt (); |
6529 | finish_if_stmt_cond (tsubst_expr (IF_COND (t), | |
6530 | args, in_decl), | |
6531 | NULL_TREE); | |
db5ae43f | 6532 | |
ad321293 | 6533 | if (tmp = THEN_CLAUSE (t), tmp) |
db5ae43f | 6534 | { |
f7d98d58 | 6535 | tsubst_expr (tmp, args, in_decl); |
ad321293 | 6536 | finish_then_clause (NULL_TREE); |
db5ae43f MS |
6537 | } |
6538 | ||
ad321293 MM |
6539 | if (tmp = ELSE_CLAUSE (t), tmp) |
6540 | { | |
6541 | begin_else_clause (); | |
6542 | tsubst_expr (tmp, args, in_decl); | |
6543 | finish_else_clause (NULL_TREE); | |
6544 | } | |
8d08fdba | 6545 | |
ad321293 | 6546 | finish_if_stmt (); |
8d08fdba | 6547 | } |
5566b478 | 6548 | break; |
8d08fdba | 6549 | |
5566b478 MS |
6550 | case COMPOUND_STMT: |
6551 | { | |
ad321293 | 6552 | tree substmt; |
8d08fdba | 6553 | |
5566b478 | 6554 | lineno = TREE_COMPLEXITY (t); |
ad321293 MM |
6555 | begin_compound_stmt (COMPOUND_STMT_NO_SCOPE (t)); |
6556 | for (substmt = COMPOUND_BODY (t); | |
6557 | substmt != NULL_TREE; | |
6558 | substmt = TREE_CHAIN (substmt)) | |
f7d98d58 | 6559 | tsubst_expr (substmt, args, in_decl); |
ad321293 MM |
6560 | return finish_compound_stmt (COMPOUND_STMT_NO_SCOPE (t), |
6561 | NULL_TREE); | |
5566b478 MS |
6562 | } |
6563 | break; | |
8d08fdba | 6564 | |
5566b478 MS |
6565 | case BREAK_STMT: |
6566 | lineno = TREE_COMPLEXITY (t); | |
ad321293 | 6567 | finish_break_stmt (); |
5566b478 | 6568 | break; |
8d08fdba | 6569 | |
6467930b MS |
6570 | case CONTINUE_STMT: |
6571 | lineno = TREE_COMPLEXITY (t); | |
ad321293 | 6572 | finish_continue_stmt (); |
6467930b MS |
6573 | break; |
6574 | ||
5566b478 MS |
6575 | case SWITCH_STMT: |
6576 | { | |
6577 | tree val, tmp; | |
5566b478 MS |
6578 | |
6579 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6580 | begin_switch_stmt (); |
6581 | val = tsubst_expr (SWITCH_COND (t), args, in_decl); | |
6582 | finish_switch_cond (val); | |
5566b478 MS |
6583 | |
6584 | if (tmp = TREE_OPERAND (t, 1), tmp) | |
f7d98d58 | 6585 | tsubst_expr (tmp, args, in_decl); |
8d08fdba | 6586 | |
ad321293 | 6587 | finish_switch_stmt (val, NULL_TREE); |
5566b478 MS |
6588 | } |
6589 | break; | |
6590 | ||
6591 | case CASE_LABEL: | |
ad321293 MM |
6592 | finish_case_label (tsubst_expr (CASE_LOW (t), args, in_decl), |
6593 | tsubst_expr (CASE_HIGH (t), args, in_decl)); | |
5566b478 MS |
6594 | break; |
6595 | ||
6596 | case LABEL_DECL: | |
6597 | t = define_label (DECL_SOURCE_FILE (t), DECL_SOURCE_LINE (t), | |
6598 | DECL_NAME (t)); | |
6599 | if (t) | |
6600 | expand_label (t); | |
6601 | break; | |
6602 | ||
6603 | case GOTO_STMT: | |
6604 | lineno = TREE_COMPLEXITY (t); | |
aa09da44 MM |
6605 | t = GOTO_DESTINATION (t); |
6606 | if (TREE_CODE (t) != IDENTIFIER_NODE) | |
6607 | /* Computed goto's must be tsubst'd into. On the other hand, | |
6608 | non-computed gotos must not be; the identifier in question | |
6609 | will have no binding. */ | |
6610 | t = tsubst_expr (t, args, in_decl); | |
6611 | finish_goto_stmt (t); | |
ad321293 MM |
6612 | break; |
6613 | ||
6614 | case ASM_STMT: | |
6615 | lineno = TREE_COMPLEXITY (t); | |
6616 | finish_asm_stmt (tsubst_expr (ASM_CV_QUAL (t), args, in_decl), | |
6617 | tsubst_expr (ASM_STRING (t), args, in_decl), | |
6618 | tsubst_expr (ASM_OUTPUTS (t), args, in_decl), | |
6619 | tsubst_expr (ASM_INPUTS (t), args, in_decl), | |
6620 | tsubst_expr (ASM_CLOBBERS (t), args, in_decl)); | |
5566b478 | 6621 | break; |
faf5394a MS |
6622 | |
6623 | case TRY_BLOCK: | |
6624 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6625 | begin_try_block (); |
6626 | tsubst_expr (TRY_STMTS (t), args, in_decl); | |
6627 | finish_try_block (NULL_TREE); | |
faf5394a | 6628 | { |
ad321293 | 6629 | tree handler = TRY_HANDLERS (t); |
faf5394a | 6630 | for (; handler; handler = TREE_CHAIN (handler)) |
f7d98d58 | 6631 | tsubst_expr (handler, args, in_decl); |
faf5394a | 6632 | } |
ad321293 | 6633 | finish_handler_sequence (NULL_TREE); |
faf5394a MS |
6634 | break; |
6635 | ||
6636 | case HANDLER: | |
6637 | lineno = TREE_COMPLEXITY (t); | |
ad321293 MM |
6638 | begin_handler (); |
6639 | if (HANDLER_PARMS (t)) | |
faf5394a | 6640 | { |
ad321293 | 6641 | tree d = HANDLER_PARMS (t); |
faf5394a | 6642 | expand_start_catch_block |
f7d98d58 JM |
6643 | (tsubst (TREE_OPERAND (d, 1), args, in_decl), |
6644 | tsubst (TREE_OPERAND (d, 0), args, in_decl)); | |
faf5394a MS |
6645 | } |
6646 | else | |
6647 | expand_start_catch_block (NULL_TREE, NULL_TREE); | |
ad321293 MM |
6648 | finish_handler_parms (NULL_TREE); |
6649 | tsubst_expr (HANDLER_BODY (t), args, in_decl); | |
6650 | finish_handler (NULL_TREE); | |
faf5394a MS |
6651 | break; |
6652 | ||
b87692e5 MS |
6653 | case TAG_DEFN: |
6654 | lineno = TREE_COMPLEXITY (t); | |
6655 | t = TREE_TYPE (t); | |
6656 | if (TREE_CODE (t) == ENUMERAL_TYPE) | |
ed44da02 | 6657 | tsubst (t, args, NULL_TREE); |
b87692e5 MS |
6658 | break; |
6659 | ||
5566b478 | 6660 | default: |
f7d98d58 | 6661 | return build_expr_from_tree (tsubst_copy (t, args, in_decl)); |
5566b478 MS |
6662 | } |
6663 | return NULL_TREE; | |
8d08fdba MS |
6664 | } |
6665 | ||
6ba89f8e | 6666 | /* Instantiate the indicated variable or function template TMPL with |
36a117a5 MM |
6667 | the template arguments in TARG_PTR. */ |
6668 | ||
5566b478 MS |
6669 | tree |
6670 | instantiate_template (tmpl, targ_ptr) | |
98c1c668 | 6671 | tree tmpl, targ_ptr; |
8d08fdba | 6672 | { |
5566b478 | 6673 | tree fndecl; |
36a117a5 MM |
6674 | tree gen_tmpl; |
6675 | tree spec; | |
5566b478 MS |
6676 | int i, len; |
6677 | struct obstack *old_fmp_obstack; | |
6678 | extern struct obstack *function_maybepermanent_obstack; | |
36a117a5 | 6679 | tree inner_args; |
5566b478 | 6680 | |
27fafc8d JM |
6681 | if (tmpl == error_mark_node) |
6682 | return error_mark_node; | |
6683 | ||
386b8a85 JM |
6684 | my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 283); |
6685 | ||
36a117a5 MM |
6686 | /* Check to see if we already have this specialization. */ |
6687 | spec = retrieve_specialization (tmpl, targ_ptr); | |
6688 | if (spec != NULL_TREE) | |
6689 | return spec; | |
6690 | ||
6691 | if (DECL_TEMPLATE_INFO (tmpl)) | |
386b8a85 | 6692 | { |
36a117a5 MM |
6693 | /* The TMPL is a partial instantiation. To get a full set of |
6694 | arguments we must add the arguments used to perform the | |
6695 | partial instantiation. */ | |
6696 | targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl), | |
6697 | targ_ptr); | |
6698 | gen_tmpl = most_general_template (tmpl); | |
6699 | ||
6700 | /* Check to see if we already have this specialization. */ | |
6701 | spec = retrieve_specialization (gen_tmpl, targ_ptr); | |
75650646 MM |
6702 | if (spec != NULL_TREE) |
6703 | return spec; | |
386b8a85 | 6704 | } |
36a117a5 MM |
6705 | else |
6706 | gen_tmpl = tmpl; | |
386b8a85 | 6707 | |
5566b478 MS |
6708 | push_obstacks (&permanent_obstack, &permanent_obstack); |
6709 | old_fmp_obstack = function_maybepermanent_obstack; | |
6710 | function_maybepermanent_obstack = &permanent_obstack; | |
8d08fdba | 6711 | |
36a117a5 MM |
6712 | len = DECL_NTPARMS (gen_tmpl); |
6713 | inner_args = innermost_args (targ_ptr); | |
5566b478 MS |
6714 | i = len; |
6715 | while (i--) | |
8d08fdba | 6716 | { |
36a117a5 | 6717 | tree t = TREE_VEC_ELT (inner_args, i); |
5566b478 MS |
6718 | if (TREE_CODE_CLASS (TREE_CODE (t)) == 't') |
6719 | { | |
6720 | tree nt = target_type (t); | |
ec255269 | 6721 | if (IS_AGGR_TYPE (nt) && decl_function_context (TYPE_MAIN_DECL (nt))) |
5566b478 | 6722 | { |
8251199e JM |
6723 | cp_error ("type `%T' composed from a local class is not a valid template-argument", t); |
6724 | cp_error (" trying to instantiate `%D'", gen_tmpl); | |
5566b478 MS |
6725 | fndecl = error_mark_node; |
6726 | goto out; | |
6727 | } | |
6728 | } | |
8d08fdba | 6729 | } |
e66d884e | 6730 | targ_ptr = copy_to_permanent (targ_ptr); |
8d08fdba | 6731 | |
5566b478 | 6732 | /* substitute template parameters */ |
36a117a5 MM |
6733 | fndecl = tsubst (DECL_RESULT (gen_tmpl), targ_ptr, gen_tmpl); |
6734 | /* The DECL_TI_TEMPLATE should always be the immediate parent | |
6735 | template, not the most general template. */ | |
6736 | DECL_TI_TEMPLATE (fndecl) = tmpl; | |
8d08fdba | 6737 | |
824b9a4c MS |
6738 | if (flag_external_templates) |
6739 | add_pending_template (fndecl); | |
6740 | ||
5566b478 MS |
6741 | out: |
6742 | function_maybepermanent_obstack = old_fmp_obstack; | |
6743 | pop_obstacks (); | |
8d08fdba | 6744 | |
5566b478 | 6745 | return fndecl; |
8d08fdba | 6746 | } |
5566b478 MS |
6747 | |
6748 | /* Push the name of the class template into the scope of the instantiation. */ | |
8d08fdba MS |
6749 | |
6750 | void | |
5566b478 MS |
6751 | overload_template_name (type) |
6752 | tree type; | |
8d08fdba | 6753 | { |
5566b478 MS |
6754 | tree id = DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)); |
6755 | tree decl; | |
8d08fdba | 6756 | |
5566b478 MS |
6757 | if (IDENTIFIER_CLASS_VALUE (id) |
6758 | && TREE_TYPE (IDENTIFIER_CLASS_VALUE (id)) == type) | |
6759 | return; | |
8d08fdba | 6760 | |
5566b478 MS |
6761 | decl = build_decl (TYPE_DECL, id, type); |
6762 | SET_DECL_ARTIFICIAL (decl); | |
6763 | pushdecl_class_level (decl); | |
8d08fdba MS |
6764 | } |
6765 | ||
956d6950 | 6766 | /* Like type_unification but designed specially to handle conversion |
9f54c803 MM |
6767 | operators. |
6768 | ||
6769 | The FN is a TEMPLATE_DECL for a function. The ARGS are the | |
6770 | arguments that are being used when calling it. | |
6771 | ||
6772 | If FN is a conversion operator, RETURN_TYPE is the type desired as | |
6773 | the result of the conversion operator. | |
6774 | ||
6775 | The EXTRA_FN_ARG, if any, is the type of an additional | |
6776 | parameter to be added to the beginning of FN's parameter list. | |
6777 | ||
6778 | The other arguments are as for type_unification. */ | |
98c1c668 JM |
6779 | |
6780 | int | |
d7684f2d MM |
6781 | fn_type_unification (fn, explicit_targs, targs, args, return_type, |
6782 | strict, extra_fn_arg) | |
386b8a85 | 6783 | tree fn, explicit_targs, targs, args, return_type; |
830bfa74 | 6784 | unification_kind_t strict; |
d7684f2d | 6785 | tree extra_fn_arg; |
98c1c668 | 6786 | { |
9f54c803 | 6787 | tree parms; |
98c1c668 JM |
6788 | |
6789 | my_friendly_assert (TREE_CODE (fn) == TEMPLATE_DECL, 0); | |
6790 | ||
9f54c803 MM |
6791 | parms = TYPE_ARG_TYPES (TREE_TYPE (fn)); |
6792 | ||
aa45967f | 6793 | if (DECL_CONV_FN_P (fn)) |
98c1c668 JM |
6794 | { |
6795 | /* This is a template conversion operator. Use the return types | |
6796 | as well as the argument types. */ | |
9f54c803 MM |
6797 | parms = scratch_tree_cons (NULL_TREE, |
6798 | TREE_TYPE (TREE_TYPE (fn)), | |
6799 | parms); | |
6800 | args = scratch_tree_cons (NULL_TREE, return_type, args); | |
98c1c668 JM |
6801 | } |
6802 | ||
d7684f2d | 6803 | if (extra_fn_arg != NULL_TREE) |
9f54c803 | 6804 | parms = scratch_tree_cons (NULL_TREE, extra_fn_arg, parms); |
d7684f2d | 6805 | |
7cd55873 MM |
6806 | /* We allow incomplete unification without an error message here |
6807 | because the standard doesn't seem to explicitly prohibit it. Our | |
6808 | callers must be ready to deal with unification failures in any | |
6809 | event. */ | |
9f54c803 MM |
6810 | return type_unification (DECL_INNERMOST_TEMPLATE_PARMS (fn), |
6811 | targs, | |
6812 | parms, | |
6813 | args, | |
6814 | explicit_targs, | |
6815 | strict, 1); | |
98c1c668 JM |
6816 | } |
6817 | ||
6818 | ||
8d08fdba MS |
6819 | /* Type unification. |
6820 | ||
6821 | We have a function template signature with one or more references to | |
6822 | template parameters, and a parameter list we wish to fit to this | |
6823 | template. If possible, produce a list of parameters for the template | |
6824 | which will cause it to fit the supplied parameter list. | |
6825 | ||
6826 | Return zero for success, 2 for an incomplete match that doesn't resolve | |
6827 | all the types, and 1 for complete failure. An error message will be | |
6828 | printed only for an incomplete match. | |
6829 | ||
9f54c803 | 6830 | TPARMS[NTPARMS] is an array of template parameter types. |
8d08fdba | 6831 | |
9f54c803 MM |
6832 | TARGS[NTPARMS] is the array into which the deduced template |
6833 | parameter values are placed. PARMS is the function template's | |
6834 | signature (using TEMPLATE_PARM_IDX nodes), and ARGS is the argument | |
6835 | list we're trying to match against it. | |
6836 | ||
6837 | The EXPLICIT_TARGS are explicit template arguments provided via a | |
6838 | template-id. | |
6467930b | 6839 | |
830bfa74 MM |
6840 | The parameter STRICT is one of: |
6841 | ||
6842 | DEDUCE_CALL: | |
6843 | We are deducing arguments for a function call, as in | |
6844 | [temp.deduct.call]. | |
6845 | ||
6846 | DEDUCE_CONV: | |
6847 | We are deducing arguments for a conversion function, as in | |
6848 | [temp.deduct.conv]. | |
6849 | ||
6850 | DEDUCE_EXACT: | |
6851 | We are deducing arguments when calculating the partial | |
6852 | ordering between specializations of function or class | |
6853 | templates, as in [temp.func.order] and [temp.class.order], | |
6854 | when doing an explicit instantiation as in [temp.explicit], | |
9f54c803 | 6855 | when determining an explicit specialization as in |
830bfa74 MM |
6856 | [temp.expl.spec], or when taking the address of a function |
6857 | template, as in [temp.deduct.funcaddr]. */ | |
8d08fdba MS |
6858 | |
6859 | int | |
9f54c803 | 6860 | type_unification (tparms, targs, parms, args, explicit_targs, |
386b8a85 | 6861 | strict, allow_incomplete) |
9f54c803 | 6862 | tree tparms, targs, parms, args, explicit_targs; |
830bfa74 MM |
6863 | unification_kind_t strict; |
6864 | int allow_incomplete; | |
386b8a85 | 6865 | { |
050367a3 | 6866 | int* explicit_mask; |
386b8a85 | 6867 | int i; |
386b8a85 | 6868 | |
830bfa74 | 6869 | for (i = 0; i < TREE_VEC_LENGTH (tparms); i++) |
050367a3 | 6870 | TREE_VEC_ELT (targs, i) = NULL_TREE; |
386b8a85 | 6871 | |
9f54c803 | 6872 | if (explicit_targs != NULL_TREE) |
75650646 MM |
6873 | { |
6874 | tree arg_vec; | |
9f54c803 | 6875 | arg_vec = coerce_template_parms (tparms, explicit_targs, NULL_TREE, 0, |
744fac59 | 6876 | 0); |
75650646 MM |
6877 | |
6878 | if (arg_vec == error_mark_node) | |
6879 | return 1; | |
386b8a85 | 6880 | |
050367a3 | 6881 | explicit_mask = alloca (sizeof (int) * TREE_VEC_LENGTH (targs)); |
7dee3f36 | 6882 | bzero ((char *) explicit_mask, sizeof(int) * TREE_VEC_LENGTH (targs)); |
050367a3 | 6883 | |
75650646 MM |
6884 | for (i = 0; |
6885 | i < TREE_VEC_LENGTH (arg_vec) | |
050367a3 | 6886 | && TREE_VEC_ELT (arg_vec, i) != NULL_TREE; |
75650646 | 6887 | ++i) |
050367a3 MM |
6888 | { |
6889 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (arg_vec, i); | |
6890 | /* Let unify know that this argument was explicit. */ | |
6891 | explicit_mask [i] = 1; | |
6892 | } | |
75650646 | 6893 | } |
050367a3 MM |
6894 | else |
6895 | explicit_mask = 0; | |
386b8a85 | 6896 | |
830bfa74 MM |
6897 | return |
6898 | type_unification_real (tparms, targs, parms, args, 0, | |
6899 | strict, allow_incomplete, explicit_mask); | |
6900 | } | |
6901 | ||
6902 | /* Adjust types before performing type deduction, as described in | |
6903 | [temp.deduct.call] and [temp.deduct.conv]. The rules in these two | |
4c7d0dff MM |
6904 | sections are symmetric. PARM is the type of a function parameter |
6905 | or the return type of the conversion function. ARG is the type of | |
6906 | the argument passed to the call, or the type of the value | |
6907 | intialized with the result of the conversion function. */ | |
386b8a85 | 6908 | |
830bfa74 MM |
6909 | void |
6910 | maybe_adjust_types_for_deduction (strict, parm, arg) | |
6911 | unification_kind_t strict; | |
6912 | tree* parm; | |
6913 | tree* arg; | |
6914 | { | |
6915 | switch (strict) | |
6916 | { | |
6917 | case DEDUCE_CALL: | |
6918 | break; | |
6919 | ||
6920 | case DEDUCE_CONV: | |
6921 | { | |
4c7d0dff MM |
6922 | /* Swap PARM and ARG throughout the remainder of this |
6923 | function; the handling is precisely symmetric since PARM | |
6924 | will initialize ARG rather than vice versa. */ | |
830bfa74 MM |
6925 | tree* temp = parm; |
6926 | parm = arg; | |
6927 | arg = temp; | |
6928 | break; | |
6929 | } | |
6930 | ||
6931 | case DEDUCE_EXACT: | |
6932 | /* There is nothing to do in this case. */ | |
6933 | return; | |
6934 | ||
6935 | default: | |
6936 | my_friendly_abort (0); | |
6937 | } | |
6938 | ||
6939 | if (TREE_CODE (*parm) != REFERENCE_TYPE) | |
6940 | { | |
6941 | /* [temp.deduct.call] | |
6942 | ||
6943 | If P is not a reference type: | |
6944 | ||
6945 | --If A is an array type, the pointer type produced by the | |
6946 | array-to-pointer standard conversion (_conv.array_) is | |
6947 | used in place of A for type deduction; otherwise, | |
6948 | ||
6949 | --If A is a function type, the pointer type produced by | |
6950 | the function-to-pointer standard conversion | |
6951 | (_conv.func_) is used in place of A for type deduction; | |
6952 | otherwise, | |
6953 | ||
6954 | --If A is a cv-qualified type, the top level | |
6955 | cv-qualifiers of A's type are ignored for type | |
6956 | deduction. */ | |
6957 | if (TREE_CODE (*arg) == ARRAY_TYPE) | |
6958 | *arg = build_pointer_type (TREE_TYPE (*arg)); | |
d8f8dca1 | 6959 | else if (TREE_CODE (*arg) == FUNCTION_TYPE) |
830bfa74 MM |
6960 | *arg = build_pointer_type (*arg); |
6961 | else | |
6962 | *arg = TYPE_MAIN_VARIANT (*arg); | |
6963 | } | |
6964 | ||
6965 | /* [temp.deduct.call] | |
6966 | ||
6967 | If P is a cv-qualified type, the top level cv-qualifiers | |
6968 | of P's type are ignored for type deduction. If P is a | |
6969 | reference type, the type referred to by P is used for | |
6970 | type deduction. */ | |
6971 | *parm = TYPE_MAIN_VARIANT (*parm); | |
6972 | if (TREE_CODE (*parm) == REFERENCE_TYPE) | |
6973 | *parm = TREE_TYPE (*parm); | |
386b8a85 JM |
6974 | } |
6975 | ||
050367a3 MM |
6976 | /* Like type_unfication. EXPLICIT_MASK, if non-NULL, is an array of |
6977 | integers, with ones in positions corresponding to arguments in | |
9f54c803 MM |
6978 | targs that were provided explicitly, and zeros elsewhere. |
6979 | ||
6980 | If SUBR is 1, we're being called recursively (to unify the | |
6981 | arguments of a function or method parameter of a function | |
6982 | template). */ | |
386b8a85 | 6983 | |
4966381a | 6984 | static int |
3b3ba9f0 | 6985 | type_unification_real (tparms, targs, parms, args, subr, |
050367a3 MM |
6986 | strict, allow_incomplete, explicit_mask) |
6987 | tree tparms, targs, parms, args; | |
830bfa74 MM |
6988 | int subr; |
6989 | unification_kind_t strict; | |
6990 | int allow_incomplete; | |
050367a3 | 6991 | int* explicit_mask; |
8d08fdba MS |
6992 | { |
6993 | tree parm, arg; | |
6994 | int i; | |
6995 | int ntparms = TREE_VEC_LENGTH (tparms); | |
830bfa74 | 6996 | int sub_strict; |
8d08fdba MS |
6997 | |
6998 | my_friendly_assert (TREE_CODE (tparms) == TREE_VEC, 289); | |
386b8a85 JM |
6999 | my_friendly_assert (parms == NULL_TREE |
7000 | || TREE_CODE (parms) == TREE_LIST, 290); | |
51c184be | 7001 | /* ARGS could be NULL (via a call from parse.y to |
8d08fdba MS |
7002 | build_x_function_call). */ |
7003 | if (args) | |
7004 | my_friendly_assert (TREE_CODE (args) == TREE_LIST, 291); | |
7005 | my_friendly_assert (ntparms > 0, 292); | |
7006 | ||
830bfa74 MM |
7007 | switch (strict) |
7008 | { | |
7009 | case DEDUCE_CALL: | |
7010 | sub_strict = UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_DERIVED; | |
7011 | break; | |
7012 | ||
7013 | case DEDUCE_CONV: | |
7014 | sub_strict = UNIFY_ALLOW_LESS_CV_QUAL; | |
7015 | break; | |
7016 | ||
7017 | case DEDUCE_EXACT: | |
7018 | sub_strict = UNIFY_ALLOW_NONE; | |
7019 | break; | |
7020 | ||
7021 | default: | |
7022 | my_friendly_abort (0); | |
7023 | } | |
7024 | ||
8d08fdba MS |
7025 | while (parms |
7026 | && parms != void_list_node | |
7027 | && args | |
7028 | && args != void_list_node) | |
7029 | { | |
7030 | parm = TREE_VALUE (parms); | |
7031 | parms = TREE_CHAIN (parms); | |
7032 | arg = TREE_VALUE (args); | |
7033 | args = TREE_CHAIN (args); | |
7034 | ||
7035 | if (arg == error_mark_node) | |
7036 | return 1; | |
7037 | if (arg == unknown_type_node) | |
34016c81 JM |
7038 | /* We can't deduce anything from this, but we might get all the |
7039 | template args from other function args. */ | |
7040 | continue; | |
b7484fbe | 7041 | |
03e70705 JM |
7042 | /* Conversions will be performed on a function argument that |
7043 | corresponds with a function parameter that contains only | |
7044 | non-deducible template parameters and explicitly specified | |
7045 | template parameters. */ | |
7046 | if (! uses_template_parms (parm)) | |
b7484fbe | 7047 | { |
03e70705 JM |
7048 | tree type; |
7049 | ||
7050 | if (TREE_CODE_CLASS (TREE_CODE (arg)) != 't') | |
7051 | type = TREE_TYPE (arg); | |
7052 | else | |
7053 | { | |
7054 | type = arg; | |
7055 | arg = NULL_TREE; | |
7056 | } | |
7057 | ||
830bfa74 | 7058 | if (strict == DEDUCE_EXACT) |
03e70705 | 7059 | { |
3bfdc719 | 7060 | if (same_type_p (parm, type)) |
03e70705 JM |
7061 | continue; |
7062 | } | |
03e70705 | 7063 | else |
343c89cd JM |
7064 | /* It might work; we shouldn't check now, because we might |
7065 | get into infinite recursion. Overload resolution will | |
7066 | handle it. */ | |
7067 | continue; | |
03e70705 | 7068 | |
b7484fbe MS |
7069 | return 1; |
7070 | } | |
7071 | ||
8d08fdba MS |
7072 | #if 0 |
7073 | if (TREE_CODE (arg) == VAR_DECL) | |
7074 | arg = TREE_TYPE (arg); | |
7075 | else if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'e') | |
7076 | arg = TREE_TYPE (arg); | |
7077 | #else | |
7078 | if (TREE_CODE_CLASS (TREE_CODE (arg)) != 't') | |
7079 | { | |
7080 | my_friendly_assert (TREE_TYPE (arg) != NULL_TREE, 293); | |
34016c81 | 7081 | if (type_unknown_p (arg)) |
28cbf42c | 7082 | { |
34016c81 JM |
7083 | /* [temp.deduct.type] A template-argument can be deduced from |
7084 | a pointer to function or pointer to member function | |
7085 | argument if the set of overloaded functions does not | |
7086 | contain function templates and at most one of a set of | |
7087 | overloaded functions provides a unique match. */ | |
7088 | ||
7089 | if (resolve_overloaded_unification | |
7090 | (tparms, targs, parm, arg, strict, sub_strict, explicit_mask) | |
7091 | != 0) | |
7092 | return 1; | |
7093 | continue; | |
28cbf42c | 7094 | } |
8d08fdba MS |
7095 | arg = TREE_TYPE (arg); |
7096 | } | |
7097 | #endif | |
830bfa74 MM |
7098 | if (!subr) |
7099 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
db5ae43f | 7100 | |
830bfa74 | 7101 | switch (unify (tparms, targs, parm, arg, sub_strict, |
050367a3 | 7102 | explicit_mask)) |
8d08fdba MS |
7103 | { |
7104 | case 0: | |
7105 | break; | |
7106 | case 1: | |
7107 | return 1; | |
7108 | } | |
7109 | } | |
7110 | /* Fail if we've reached the end of the parm list, and more args | |
7111 | are present, and the parm list isn't variadic. */ | |
7112 | if (args && args != void_list_node && parms == void_list_node) | |
7113 | return 1; | |
7114 | /* Fail if parms are left and they don't have default values. */ | |
7115 | if (parms | |
7116 | && parms != void_list_node | |
7117 | && TREE_PURPOSE (parms) == NULL_TREE) | |
7118 | return 1; | |
7119 | if (!subr) | |
7120 | for (i = 0; i < ntparms; i++) | |
050367a3 | 7121 | if (TREE_VEC_ELT (targs, i) == NULL_TREE) |
8d08fdba | 7122 | { |
386b8a85 | 7123 | if (!allow_incomplete) |
8251199e | 7124 | error ("incomplete type unification"); |
8d08fdba MS |
7125 | return 2; |
7126 | } | |
7127 | return 0; | |
7128 | } | |
7129 | ||
34016c81 JM |
7130 | /* Subroutine of type_unification_real. Args are like the variables at the |
7131 | call site. ARG is an overloaded function (or template-id); we try | |
7132 | deducing template args from each of the overloads, and if only one | |
7133 | succeeds, we go with that. Modifies TARGS and returns 0 on success. */ | |
7134 | ||
7135 | static int | |
7136 | resolve_overloaded_unification (tparms, targs, parm, arg, strict, | |
7137 | sub_strict, explicit_mask) | |
7138 | tree tparms, targs, parm, arg; | |
7139 | unification_kind_t strict; | |
7140 | int sub_strict; | |
7141 | int* explicit_mask; | |
7142 | { | |
7143 | tree tempargs = copy_node (targs); | |
7144 | int good = 0; | |
7145 | ||
7146 | if (TREE_CODE (arg) == ADDR_EXPR) | |
7147 | arg = TREE_OPERAND (arg, 0); | |
9f3d9e46 | 7148 | |
d8f8dca1 MM |
7149 | if (TREE_CODE (arg) == COMPONENT_REF) |
7150 | /* Handle `&x' where `x' is some static or non-static member | |
7151 | function name. */ | |
7152 | arg = TREE_OPERAND (arg, 1); | |
7153 | ||
9f3d9e46 JM |
7154 | /* Strip baselink information. */ |
7155 | while (TREE_CODE (arg) == TREE_LIST) | |
7156 | arg = TREE_VALUE (arg); | |
7157 | ||
34016c81 JM |
7158 | if (TREE_CODE (arg) == TEMPLATE_ID_EXPR) |
7159 | { | |
7160 | /* If we got some explicit template args, we need to plug them into | |
7161 | the affected templates before we try to unify, in case the | |
7162 | explicit args will completely resolve the templates in question. */ | |
7163 | ||
7164 | tree expl_subargs = TREE_OPERAND (arg, 1); | |
7165 | arg = TREE_OPERAND (arg, 0); | |
7166 | ||
7167 | for (; arg; arg = OVL_NEXT (arg)) | |
7168 | { | |
7169 | tree fn = OVL_CURRENT (arg); | |
7170 | tree subargs, elem; | |
7171 | ||
7172 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
7173 | continue; | |
7174 | ||
7175 | subargs = get_bindings_overload (fn, DECL_RESULT (fn), expl_subargs); | |
7176 | if (subargs) | |
7177 | { | |
7178 | elem = tsubst (TREE_TYPE (fn), subargs, NULL_TREE); | |
d8f8dca1 MM |
7179 | if (TREE_CODE (elem) == METHOD_TYPE) |
7180 | elem = build_ptrmemfunc_type (build_pointer_type (elem)); | |
e97e5263 | 7181 | good += try_one_overload (tparms, targs, tempargs, parm, elem, |
34016c81 JM |
7182 | strict, sub_strict, explicit_mask); |
7183 | } | |
7184 | } | |
7185 | } | |
7186 | else if (TREE_CODE (arg) == OVERLOAD) | |
7187 | { | |
7188 | for (; arg; arg = OVL_NEXT (arg)) | |
d8f8dca1 MM |
7189 | { |
7190 | tree type = TREE_TYPE (OVL_CURRENT (arg)); | |
7191 | if (TREE_CODE (type) == METHOD_TYPE) | |
7192 | type = build_ptrmemfunc_type (build_pointer_type (type)); | |
7193 | good += try_one_overload (tparms, targs, tempargs, parm, | |
7194 | type, | |
7195 | strict, sub_strict, explicit_mask); | |
7196 | } | |
34016c81 JM |
7197 | } |
7198 | else | |
7199 | my_friendly_abort (981006); | |
7200 | ||
7201 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
7202 | to function or pointer to member function argument if the set of | |
7203 | overloaded functions does not contain function templates and at most | |
7204 | one of a set of overloaded functions provides a unique match. | |
7205 | ||
7206 | So if we found multiple possibilities, we return success but don't | |
7207 | deduce anything. */ | |
7208 | ||
7209 | if (good == 1) | |
7210 | { | |
7211 | int i = TREE_VEC_LENGTH (targs); | |
7212 | for (; i--; ) | |
7213 | if (TREE_VEC_ELT (tempargs, i)) | |
7214 | TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i); | |
7215 | } | |
7216 | if (good) | |
7217 | return 0; | |
7218 | ||
7219 | return 1; | |
7220 | } | |
7221 | ||
7222 | /* Subroutine of resolve_overloaded_unification; does deduction for a single | |
7223 | overload. Fills TARGS with any deduced arguments, or error_mark_node if | |
7224 | different overloads deduce different arguments for a given parm. | |
7225 | Returns 1 on success. */ | |
7226 | ||
7227 | static int | |
e97e5263 | 7228 | try_one_overload (tparms, orig_targs, targs, parm, arg, strict, |
34016c81 | 7229 | sub_strict, explicit_mask) |
e97e5263 | 7230 | tree tparms, orig_targs, targs, parm, arg; |
34016c81 JM |
7231 | unification_kind_t strict; |
7232 | int sub_strict; | |
7233 | int* explicit_mask; | |
7234 | { | |
7235 | int nargs; | |
7236 | tree tempargs; | |
7237 | int i; | |
7238 | ||
7239 | /* [temp.deduct.type] A template-argument can be deduced from a pointer | |
7240 | to function or pointer to member function argument if the set of | |
7241 | overloaded functions does not contain function templates and at most | |
7242 | one of a set of overloaded functions provides a unique match. | |
7243 | ||
7244 | So if this is a template, just return success. */ | |
7245 | ||
7246 | if (uses_template_parms (arg)) | |
7247 | return 1; | |
7248 | ||
7249 | maybe_adjust_types_for_deduction (strict, &parm, &arg); | |
7250 | ||
7251 | /* We don't copy orig_targs for this because if we have already deduced | |
7252 | some template args from previous args, unify would complain when we | |
7253 | try to deduce a template parameter for the same argument, even though | |
7254 | there isn't really a conflict. */ | |
7255 | nargs = TREE_VEC_LENGTH (targs); | |
7256 | tempargs = make_scratch_vec (nargs); | |
7257 | ||
7258 | if (unify (tparms, tempargs, parm, arg, sub_strict, explicit_mask) != 0) | |
7259 | return 0; | |
7260 | ||
7261 | /* First make sure we didn't deduce anything that conflicts with | |
e97e5263 | 7262 | explicitly specified args. */ |
34016c81 JM |
7263 | for (i = nargs; i--; ) |
7264 | { | |
7265 | tree elt = TREE_VEC_ELT (tempargs, i); | |
e97e5263 | 7266 | tree oldelt = TREE_VEC_ELT (orig_targs, i); |
34016c81 JM |
7267 | |
7268 | if (elt == NULL_TREE) | |
7269 | continue; | |
7270 | else if (uses_template_parms (elt)) | |
7271 | { | |
7272 | /* Since we're unifying against ourselves, we will fill in template | |
7273 | args used in the function parm list with our own template parms. | |
7274 | Discard them. */ | |
7275 | TREE_VEC_ELT (tempargs, i) = NULL_TREE; | |
7276 | continue; | |
7277 | } | |
7278 | else if (oldelt && ! template_args_equal (oldelt, elt)) | |
7279 | return 0; | |
7280 | } | |
7281 | ||
7282 | for (i = nargs; i--; ) | |
7283 | { | |
7284 | tree elt = TREE_VEC_ELT (tempargs, i); | |
7285 | ||
7286 | if (elt) | |
7287 | TREE_VEC_ELT (targs, i) = elt; | |
7288 | } | |
7289 | ||
7290 | return 1; | |
7291 | } | |
7292 | ||
db2767b6 MM |
7293 | /* Returns the level of DECL, which declares a template parameter. */ |
7294 | ||
04a81d94 | 7295 | int |
db2767b6 MM |
7296 | template_decl_level (decl) |
7297 | tree decl; | |
7298 | { | |
7299 | switch (TREE_CODE (decl)) | |
7300 | { | |
7301 | case TYPE_DECL: | |
7302 | case TEMPLATE_DECL: | |
7303 | return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl)); | |
7304 | ||
7305 | case PARM_DECL: | |
7306 | return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl)); | |
7307 | ||
7308 | default: | |
7309 | my_friendly_abort (0); | |
5ffe581d | 7310 | return 0; |
db2767b6 MM |
7311 | } |
7312 | } | |
7313 | ||
830bfa74 MM |
7314 | /* Decide whether ARG can be unified with PARM, considering only the |
7315 | cv-qualifiers of each type, given STRICT as documented for unify. | |
7316 | Returns non-zero iff the unification is OK on that basis.*/ | |
e92cc029 | 7317 | |
830bfa74 MM |
7318 | int |
7319 | check_cv_quals_for_unify (strict, arg, parm) | |
7320 | int strict; | |
7321 | tree arg; | |
7322 | tree parm; | |
7323 | { | |
7324 | return !((!(strict & UNIFY_ALLOW_MORE_CV_QUAL) | |
91063b51 | 7325 | && !at_least_as_qualified_p (arg, parm)) |
830bfa74 | 7326 | || (!(strict & UNIFY_ALLOW_LESS_CV_QUAL) |
91063b51 | 7327 | && (!at_least_as_qualified_p (parm, arg)))); |
830bfa74 MM |
7328 | } |
7329 | ||
7330 | /* Takes parameters as for type_unification. Returns 0 if the | |
7331 | type deduction suceeds, 1 otherwise. The parameter STRICT is a | |
7332 | bitwise or of the following flags: | |
7333 | ||
7334 | UNIFY_ALLOW_NONE: | |
7335 | Require an exact match between PARM and ARG. | |
7336 | UNIFY_ALLOW_MORE_CV_QUAL: | |
7337 | Allow the deduced ARG to be more cv-qualified than ARG. | |
7338 | UNIFY_ALLOW_LESS_CV_QUAL: | |
7339 | Allow the deduced ARG to be less cv-qualified than ARG. | |
7340 | UNIFY_ALLOW_DERIVED: | |
7341 | Allow the deduced ARG to be a template base class of ARG, | |
7342 | or a pointer to a template base class of the type pointed to by | |
161c12b0 JM |
7343 | ARG. |
7344 | UNIFY_ALLOW_INTEGER: | |
7345 | Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX | |
7346 | case for more information. */ | |
830bfa74 MM |
7347 | |
7348 | int | |
7349 | unify (tparms, targs, parm, arg, strict, explicit_mask) | |
050367a3 | 7350 | tree tparms, targs, parm, arg; |
830bfa74 | 7351 | int strict; |
050367a3 | 7352 | int* explicit_mask; |
8d08fdba MS |
7353 | { |
7354 | int idx; | |
050367a3 | 7355 | tree targ; |
db2767b6 | 7356 | tree tparm; |
8d08fdba MS |
7357 | |
7358 | /* I don't think this will do the right thing with respect to types. | |
7359 | But the only case I've seen it in so far has been array bounds, where | |
7360 | signedness is the only information lost, and I think that will be | |
7361 | okay. */ | |
7362 | while (TREE_CODE (parm) == NOP_EXPR) | |
7363 | parm = TREE_OPERAND (parm, 0); | |
7364 | ||
7365 | if (arg == error_mark_node) | |
7366 | return 1; | |
7367 | if (arg == unknown_type_node) | |
34016c81 JM |
7368 | /* We can't deduce anything from this, but we might get all the |
7369 | template args from other function args. */ | |
7370 | return 0; | |
7371 | ||
db2767b6 | 7372 | /* If PARM uses template parameters, then we can't bail out here, |
6bdb985f | 7373 | even if ARG == PARM, since we won't record unifications for the |
db2767b6 MM |
7374 | template parameters. We might need them if we're trying to |
7375 | figure out which of two things is more specialized. */ | |
7376 | if (arg == parm && !uses_template_parms (parm)) | |
8d08fdba MS |
7377 | return 0; |
7378 | ||
830bfa74 MM |
7379 | /* Immediately reject some pairs that won't unify because of |
7380 | cv-qualification mismatches. */ | |
7381 | if (TREE_CODE (arg) == TREE_CODE (parm) | |
49432171 | 7382 | && TREE_CODE_CLASS (TREE_CODE (arg)) == 't' |
830bfa74 MM |
7383 | /* We check the cv-qualifiers when unifying with template type |
7384 | parameters below. We want to allow ARG `const T' to unify with | |
7385 | PARM `T' for example, when computing which of two templates | |
7386 | is more specialized, for example. */ | |
7387 | && TREE_CODE (arg) != TEMPLATE_TYPE_PARM | |
7388 | && !check_cv_quals_for_unify (strict, arg, parm)) | |
49432171 JM |
7389 | return 1; |
7390 | ||
8d08fdba MS |
7391 | switch (TREE_CODE (parm)) |
7392 | { | |
2ca340ae JM |
7393 | case TYPENAME_TYPE: |
7394 | /* In a type which contains a nested-name-specifier, template | |
7395 | argument values cannot be deduced for template parameters used | |
7396 | within the nested-name-specifier. */ | |
7397 | return 0; | |
7398 | ||
8d08fdba | 7399 | case TEMPLATE_TYPE_PARM: |
73b0fce8 | 7400 | case TEMPLATE_TEMPLATE_PARM: |
db2767b6 MM |
7401 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
7402 | ||
7403 | if (TEMPLATE_TYPE_LEVEL (parm) | |
7404 | != template_decl_level (tparm)) | |
7405 | /* The PARM is not one we're trying to unify. Just check | |
7406 | to see if it matches ARG. */ | |
7407 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
3bfdc719 | 7408 | && same_type_p (parm, arg)) ? 0 : 1; |
73b0fce8 | 7409 | idx = TEMPLATE_TYPE_IDX (parm); |
050367a3 | 7410 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 7411 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx)); |
050367a3 | 7412 | |
73b0fce8 | 7413 | /* Check for mixed types and values. */ |
db2767b6 MM |
7414 | if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM |
7415 | && TREE_CODE (tparm) != TYPE_DECL) | |
7416 | || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM | |
7417 | && TREE_CODE (tparm) != TEMPLATE_DECL)) | |
73b0fce8 KL |
7418 | return 1; |
7419 | ||
050367a3 MM |
7420 | if (!strict && targ != NULL_TREE |
7421 | && explicit_mask && explicit_mask[idx]) | |
73b0fce8 KL |
7422 | /* An explicit template argument. Don't even try to match |
7423 | here; the overload resolution code will manage check to | |
7424 | see whether the call is legal. */ | |
7425 | return 0; | |
7426 | ||
db2767b6 | 7427 | if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM) |
73b0fce8 | 7428 | { |
7ddedda4 | 7429 | if (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm)) |
db2767b6 MM |
7430 | { |
7431 | /* We arrive here when PARM does not involve template | |
7432 | specialization. */ | |
73b0fce8 | 7433 | |
db2767b6 MM |
7434 | /* ARG must be constructed from a template class. */ |
7435 | if (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg)) | |
7436 | return 1; | |
73b0fce8 | 7437 | |
db2767b6 | 7438 | { |
7ddedda4 MM |
7439 | tree parmtmpl = TYPE_TI_TEMPLATE (parm); |
7440 | tree parmvec = TYPE_TI_ARGS (parm); | |
db2767b6 MM |
7441 | tree argvec = CLASSTYPE_TI_ARGS (arg); |
7442 | tree argtmplvec | |
7443 | = DECL_INNERMOST_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (arg)); | |
7444 | int i; | |
7445 | ||
7446 | /* The parameter and argument roles have to be switched here | |
7447 | in order to handle default arguments properly. For example, | |
7448 | template<template <class> class TT> void f(TT<int>) | |
7449 | should be able to accept vector<int> which comes from | |
744fac59 | 7450 | template <class T, class Allocator = allocator> |
73b0fce8 KL |
7451 | class vector. */ |
7452 | ||
744fac59 | 7453 | if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 1, 1) |
db2767b6 MM |
7454 | == error_mark_node) |
7455 | return 1; | |
73b0fce8 | 7456 | |
db2767b6 MM |
7457 | /* Deduce arguments T, i from TT<T> or TT<i>. */ |
7458 | for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i) | |
7459 | { | |
7460 | tree t = TREE_VEC_ELT (parmvec, i); | |
7461 | if (TREE_CODE (t) != TEMPLATE_TYPE_PARM | |
7462 | && TREE_CODE (t) != TEMPLATE_TEMPLATE_PARM | |
7463 | && TREE_CODE (t) != TEMPLATE_PARM_INDEX) | |
7464 | continue; | |
73b0fce8 | 7465 | |
db2767b6 | 7466 | /* This argument can be deduced. */ |
73b0fce8 | 7467 | |
830bfa74 MM |
7468 | if (unify (tparms, targs, t, |
7469 | TREE_VEC_ELT (argvec, i), | |
7470 | UNIFY_ALLOW_NONE, explicit_mask)) | |
db2767b6 MM |
7471 | return 1; |
7472 | } | |
73b0fce8 | 7473 | } |
db2767b6 MM |
7474 | arg = CLASSTYPE_TI_TEMPLATE (arg); |
7475 | } | |
7476 | } | |
7477 | else | |
7478 | { | |
830bfa74 MM |
7479 | /* If PARM is `const T' and ARG is only `int', we don't have |
7480 | a match unless we are allowing additional qualification. | |
7481 | If ARG is `const int' and PARM is just `T' that's OK; | |
7482 | that binds `const int' to `T'. */ | |
7483 | if (!check_cv_quals_for_unify (strict | UNIFY_ALLOW_LESS_CV_QUAL, | |
7484 | arg, parm)) | |
db2767b6 MM |
7485 | return 1; |
7486 | ||
830bfa74 MM |
7487 | /* Consider the case where ARG is `const volatile int' and |
7488 | PARM is `const T'. Then, T should be `volatile int'. */ | |
7489 | arg = | |
91063b51 MM |
7490 | cp_build_qualified_type (arg, |
7491 | CP_TYPE_QUALS (arg) | |
7492 | & ~CP_TYPE_QUALS (parm)); | |
73b0fce8 KL |
7493 | } |
7494 | ||
7495 | /* Simple cases: Value already set, does match or doesn't. */ | |
3a56f0ab | 7496 | if (targ != NULL_TREE |
3bfdc719 | 7497 | && (same_type_p (targ, arg) |
3a56f0ab | 7498 | || (explicit_mask && explicit_mask[idx]))) |
73b0fce8 | 7499 | return 0; |
050367a3 | 7500 | else if (targ) |
73b0fce8 | 7501 | return 1; |
050367a3 | 7502 | TREE_VEC_ELT (targs, idx) = arg; |
73b0fce8 KL |
7503 | return 0; |
7504 | ||
f84b4be9 | 7505 | case TEMPLATE_PARM_INDEX: |
db2767b6 MM |
7506 | tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0)); |
7507 | ||
7508 | if (TEMPLATE_PARM_LEVEL (parm) | |
7509 | != template_decl_level (tparm)) | |
7510 | /* The PARM is not one we're trying to unify. Just check | |
7511 | to see if it matches ARG. */ | |
7512 | return (TREE_CODE (arg) == TREE_CODE (parm) | |
67ffc812 | 7513 | && cp_tree_equal (parm, arg) > 0) ? 0 : 1; |
db2767b6 | 7514 | |
f84b4be9 | 7515 | idx = TEMPLATE_PARM_IDX (parm); |
050367a3 | 7516 | targ = TREE_VEC_ELT (targs, idx); |
db2767b6 | 7517 | |
050367a3 | 7518 | if (targ) |
8d08fdba | 7519 | { |
67ffc812 | 7520 | int i = (cp_tree_equal (targ, arg) > 0); |
312e7d50 JM |
7521 | if (i == 1) |
7522 | return 0; | |
7523 | else if (i == 0) | |
7524 | return 1; | |
7525 | else | |
7526 | my_friendly_abort (42); | |
8d08fdba | 7527 | } |
8d08fdba | 7528 | |
161c12b0 JM |
7529 | /* [temp.deduct.type] If, in the declaration of a function template |
7530 | with a non-type template-parameter, the non-type | |
7531 | template-parameter is used in an expression in the function | |
7532 | parameter-list and, if the corresponding template-argument is | |
7533 | deduced, the template-argument type shall match the type of the | |
7534 | template-parameter exactly, except that a template-argument | |
7535 | deduced from an array bound may be of any integral type. */ | |
7536 | if (same_type_p (TREE_TYPE (arg), TREE_TYPE (parm))) | |
7537 | /* OK */; | |
7538 | else if ((strict & UNIFY_ALLOW_INTEGER) | |
7539 | && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE | |
7540 | || TREE_CODE (TREE_TYPE (parm)) == BOOLEAN_TYPE)) | |
7541 | /* OK */; | |
7542 | else | |
7543 | return 1; | |
7544 | ||
050367a3 | 7545 | TREE_VEC_ELT (targs, idx) = copy_to_permanent (arg); |
8d08fdba MS |
7546 | return 0; |
7547 | ||
7548 | case POINTER_TYPE: | |
830bfa74 MM |
7549 | { |
7550 | int sub_strict; | |
4ac14744 | 7551 | |
830bfa74 MM |
7552 | if (TREE_CODE (arg) == RECORD_TYPE && TYPE_PTRMEMFUNC_FLAG (arg)) |
7553 | return (unify (tparms, targs, parm, | |
7554 | TYPE_PTRMEMFUNC_FN_TYPE (arg), strict, | |
7555 | explicit_mask)); | |
7556 | ||
7557 | if (TREE_CODE (arg) != POINTER_TYPE) | |
7558 | return 1; | |
7559 | ||
7560 | /* [temp.deduct.call] | |
7561 | ||
7562 | A can be another pointer or pointer to member type that can | |
7563 | be converted to the deduced A via a qualification | |
7564 | conversion (_conv.qual_). | |
7565 | ||
7566 | We pass down STRICT here rather than UNIFY_ALLOW_NONE. | |
7567 | This will allow for additional cv-qualification of the | |
7568 | pointed-to types if appropriate. In general, this is a bit | |
7569 | too generous; we are only supposed to allow qualification | |
7570 | conversions and this method will allow an ARG of char** and | |
7571 | a deduced ARG of const char**. However, overload | |
7572 | resolution will subsequently invalidate the candidate, so | |
7573 | this is probably OK. */ | |
7574 | sub_strict = strict; | |
7575 | ||
7576 | if (TREE_CODE (TREE_TYPE (arg)) != RECORD_TYPE | |
7577 | || TYPE_PTRMEMFUNC_FLAG (TREE_TYPE (arg))) | |
7578 | /* The derived-to-base conversion only persists through one | |
7579 | level of pointers. */ | |
7580 | sub_strict &= ~UNIFY_ALLOW_DERIVED; | |
7581 | ||
7582 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE | |
7583 | (arg), sub_strict, explicit_mask); | |
7584 | } | |
8d08fdba MS |
7585 | |
7586 | case REFERENCE_TYPE: | |
830bfa74 MM |
7587 | if (TREE_CODE (arg) != REFERENCE_TYPE) |
7588 | return 1; | |
7589 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), | |
7590 | UNIFY_ALLOW_NONE, explicit_mask); | |
8d08fdba MS |
7591 | |
7592 | case ARRAY_TYPE: | |
7593 | if (TREE_CODE (arg) != ARRAY_TYPE) | |
7594 | return 1; | |
3042d5be MM |
7595 | if ((TYPE_DOMAIN (parm) == NULL_TREE) |
7596 | != (TYPE_DOMAIN (arg) == NULL_TREE)) | |
7597 | return 1; | |
7598 | if (TYPE_DOMAIN (parm) != NULL_TREE | |
830bfa74 MM |
7599 | && unify (tparms, targs, TYPE_DOMAIN (parm), |
7600 | TYPE_DOMAIN (arg), UNIFY_ALLOW_NONE, explicit_mask) != 0) | |
8d08fdba | 7601 | return 1; |
830bfa74 MM |
7602 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
7603 | UNIFY_ALLOW_NONE, explicit_mask); | |
8d08fdba MS |
7604 | |
7605 | case REAL_TYPE: | |
37c46b43 | 7606 | case COMPLEX_TYPE: |
8d08fdba | 7607 | case INTEGER_TYPE: |
42976354 | 7608 | case BOOLEAN_TYPE: |
5ad5a526 | 7609 | case VOID_TYPE: |
f376e137 MS |
7610 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
7611 | return 1; | |
7612 | ||
514a1f18 JM |
7613 | if (TREE_CODE (parm) == INTEGER_TYPE |
7614 | && TREE_CODE (TYPE_MAX_VALUE (parm)) != INTEGER_CST) | |
8d08fdba MS |
7615 | { |
7616 | if (TYPE_MIN_VALUE (parm) && TYPE_MIN_VALUE (arg) | |
830bfa74 | 7617 | && unify (tparms, targs, TYPE_MIN_VALUE (parm), |
161c12b0 JM |
7618 | TYPE_MIN_VALUE (arg), UNIFY_ALLOW_INTEGER, |
7619 | explicit_mask)) | |
8d08fdba MS |
7620 | return 1; |
7621 | if (TYPE_MAX_VALUE (parm) && TYPE_MAX_VALUE (arg) | |
830bfa74 | 7622 | && unify (tparms, targs, TYPE_MAX_VALUE (parm), |
161c12b0 JM |
7623 | TYPE_MAX_VALUE (arg), UNIFY_ALLOW_INTEGER, |
7624 | explicit_mask)) | |
8d08fdba MS |
7625 | return 1; |
7626 | } | |
514a1f18 JM |
7627 | /* We use the TYPE_MAIN_VARIANT since we have already |
7628 | checked cv-qualification at the top of the | |
7629 | function. */ | |
3bfdc719 MM |
7630 | else if (!same_type_p (TYPE_MAIN_VARIANT (arg), |
7631 | TYPE_MAIN_VARIANT (parm))) | |
ca79f85d JM |
7632 | return 1; |
7633 | ||
8d08fdba MS |
7634 | /* As far as unification is concerned, this wins. Later checks |
7635 | will invalidate it if necessary. */ | |
7636 | return 0; | |
7637 | ||
7638 | /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */ | |
bd6dd845 | 7639 | /* Type INTEGER_CST can come from ordinary constant template args. */ |
8d08fdba | 7640 | case INTEGER_CST: |
bd6dd845 MS |
7641 | while (TREE_CODE (arg) == NOP_EXPR) |
7642 | arg = TREE_OPERAND (arg, 0); | |
7643 | ||
8d08fdba MS |
7644 | if (TREE_CODE (arg) != INTEGER_CST) |
7645 | return 1; | |
7646 | return !tree_int_cst_equal (parm, arg); | |
7647 | ||
8d08fdba MS |
7648 | case TREE_VEC: |
7649 | { | |
7650 | int i; | |
7651 | if (TREE_CODE (arg) != TREE_VEC) | |
7652 | return 1; | |
7653 | if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg)) | |
7654 | return 1; | |
7655 | for (i = TREE_VEC_LENGTH (parm) - 1; i >= 0; i--) | |
830bfa74 | 7656 | if (unify (tparms, targs, |
8d08fdba | 7657 | TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i), |
830bfa74 | 7658 | UNIFY_ALLOW_NONE, explicit_mask)) |
8d08fdba MS |
7659 | return 1; |
7660 | return 0; | |
7661 | } | |
7662 | ||
8d08fdba | 7663 | case RECORD_TYPE: |
f181d4ae | 7664 | case UNION_TYPE: |
db5ae43f | 7665 | if (TYPE_PTRMEMFUNC_FLAG (parm)) |
830bfa74 | 7666 | return unify (tparms, targs, TYPE_PTRMEMFUNC_FN_TYPE (parm), |
050367a3 | 7667 | arg, strict, explicit_mask); |
8d08fdba | 7668 | |
f181d4ae | 7669 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
a4443a08 | 7670 | return 1; |
830bfa74 | 7671 | |
5db698f6 | 7672 | if (CLASSTYPE_TEMPLATE_INFO (parm)) |
5566b478 | 7673 | { |
6467930b | 7674 | tree t = NULL_TREE; |
830bfa74 MM |
7675 | if (strict & UNIFY_ALLOW_DERIVED) |
7676 | /* [temp.deduct.call] | |
7677 | ||
7678 | If P is a class, and P has the form template-id, then A | |
7679 | can be a derived class of the deduced A. Likewise, if | |
7680 | P is a pointer to a class of the form template-id, A | |
7681 | can be a pointer to a derived class pointed to by the | |
6df47b06 MM |
7682 | deduced A. |
7683 | ||
7684 | The call to get_template_base also handles the case | |
7685 | where PARM and ARG are the same type, i.e., where no | |
7686 | derivation is involved. */ | |
6467930b | 7687 | t = get_template_base (CLASSTYPE_TI_TEMPLATE (parm), arg); |
6df47b06 | 7688 | else if (CLASSTYPE_TEMPLATE_INFO (arg) |
9fbf56f7 MM |
7689 | && (CLASSTYPE_TI_TEMPLATE (parm) |
7690 | == CLASSTYPE_TI_TEMPLATE (arg))) | |
6df47b06 MM |
7691 | /* Perhaps PARM is something like S<U> and ARG is S<int>. |
7692 | Then, we should unify `int' and `U'. */ | |
6467930b | 7693 | t = arg; |
6df47b06 | 7694 | |
6467930b | 7695 | if (! t || t == error_mark_node) |
5566b478 | 7696 | return 1; |
6467930b | 7697 | |
830bfa74 MM |
7698 | return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm), |
7699 | CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE, | |
7700 | explicit_mask); | |
5566b478 | 7701 | } |
3bfdc719 MM |
7702 | else if (!same_type_p (TYPE_MAIN_VARIANT (parm), |
7703 | TYPE_MAIN_VARIANT (arg))) | |
5566b478 | 7704 | return 1; |
a4443a08 | 7705 | return 0; |
8d08fdba MS |
7706 | |
7707 | case METHOD_TYPE: | |
8d08fdba | 7708 | case FUNCTION_TYPE: |
830bfa74 | 7709 | if (TREE_CODE (arg) != TREE_CODE (parm)) |
8d08fdba | 7710 | return 1; |
830bfa74 MM |
7711 | |
7712 | if (unify (tparms, targs, TREE_TYPE (parm), | |
7713 | TREE_TYPE (arg), UNIFY_ALLOW_NONE, explicit_mask)) | |
28cbf42c | 7714 | return 1; |
386b8a85 | 7715 | return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm), |
3b3ba9f0 | 7716 | TYPE_ARG_TYPES (arg), 1, |
830bfa74 | 7717 | DEDUCE_EXACT, 0, explicit_mask); |
a4443a08 MS |
7718 | |
7719 | case OFFSET_TYPE: | |
7720 | if (TREE_CODE (arg) != OFFSET_TYPE) | |
7721 | return 1; | |
830bfa74 MM |
7722 | if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm), |
7723 | TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE, explicit_mask)) | |
a4443a08 | 7724 | return 1; |
830bfa74 | 7725 | return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg), |
9f3d9e46 | 7726 | strict, explicit_mask); |
a4443a08 | 7727 | |
f62dbf03 | 7728 | case CONST_DECL: |
830bfa74 | 7729 | if (arg != decl_constant_value (parm)) |
f62dbf03 JM |
7730 | return 1; |
7731 | return 0; | |
7732 | ||
027905b4 KL |
7733 | case TEMPLATE_DECL: |
7734 | /* Matched cases are handled by the ARG == PARM test above. */ | |
7735 | return 1; | |
7736 | ||
53929c47 JM |
7737 | case MINUS_EXPR: |
7738 | if (TREE_CODE (TREE_OPERAND (parm, 1)) == INTEGER_CST) | |
7739 | { | |
7740 | /* We handle this case specially, since it comes up with | |
7741 | arrays. In particular, something like: | |
7742 | ||
7743 | template <int N> void f(int (&x)[N]); | |
7744 | ||
7745 | Here, we are trying to unify the range type, which | |
7746 | looks like [0 ... (N - 1)]. */ | |
7747 | tree t, t1, t2; | |
7748 | t1 = TREE_OPERAND (parm, 0); | |
7749 | t2 = TREE_OPERAND (parm, 1); | |
7750 | ||
7751 | /* Should this be a regular fold? */ | |
7752 | t = maybe_fold_nontype_arg (build (PLUS_EXPR, | |
7753 | integer_type_node, | |
7754 | arg, t2)); | |
7755 | ||
161c12b0 | 7756 | return unify (tparms, targs, t1, t, strict, explicit_mask); |
53929c47 JM |
7757 | } |
7758 | /* else fall through */ | |
7759 | ||
8d08fdba | 7760 | default: |
050367a3 MM |
7761 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (parm)))) |
7762 | { | |
7763 | /* We're looking at an expression. This can happen with | |
7764 | something like: | |
7765 | ||
7766 | template <int I> | |
7767 | void foo(S<I>, S<I + 2>); | |
7768 | ||
7769 | If the call looked like: | |
7770 | ||
7771 | foo(S<2>(), S<4>()); | |
7772 | ||
7773 | we would have already matched `I' with `2'. Now, we'd | |
7774 | like to know if `4' matches `I + 2'. So, we substitute | |
7775 | into that expression, and fold constants, in the hope of | |
7776 | figuring it out. */ | |
7777 | tree t = | |
7778 | maybe_fold_nontype_arg (tsubst_expr (parm, targs, NULL_TREE)); | |
53929c47 | 7779 | tree a = maybe_fold_nontype_arg (arg); |
050367a3 | 7780 | |
53929c47 | 7781 | if (!IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (t)))) |
050367a3 | 7782 | /* Good, we mangaged to simplify the exression. */ |
53929c47 | 7783 | return unify (tparms, targs, t, a, UNIFY_ALLOW_NONE, |
050367a3 MM |
7784 | explicit_mask); |
7785 | else | |
7786 | /* Bad, we couldn't simplify this. Assume it doesn't | |
7787 | unify. */ | |
7788 | return 1; | |
7789 | } | |
7790 | else | |
b4c4a9ec MM |
7791 | sorry ("use of `%s' in template type unification", |
7792 | tree_code_name [(int) TREE_CODE (parm)]); | |
050367a3 | 7793 | |
8d08fdba MS |
7794 | return 1; |
7795 | } | |
7796 | } | |
8d08fdba | 7797 | \f |
03d0f4af MM |
7798 | /* Called if RESULT is explicitly instantiated, or is a member of an |
7799 | explicitly instantiated class, or if using -frepo and the | |
7800 | instantiation of RESULT has been assigned to this file. */ | |
7801 | ||
faae18ab | 7802 | void |
5566b478 | 7803 | mark_decl_instantiated (result, extern_p) |
faae18ab MS |
7804 | tree result; |
7805 | int extern_p; | |
7806 | { | |
75650646 MM |
7807 | if (TREE_CODE (result) != FUNCTION_DECL) |
7808 | /* The TREE_PUBLIC flag for function declarations will have been | |
7809 | set correctly by tsubst. */ | |
7810 | TREE_PUBLIC (result) = 1; | |
faae18ab MS |
7811 | |
7812 | if (! extern_p) | |
7813 | { | |
7814 | DECL_INTERFACE_KNOWN (result) = 1; | |
7815 | DECL_NOT_REALLY_EXTERN (result) = 1; | |
a7d87521 | 7816 | |
1a408d07 JM |
7817 | /* Always make artificials weak. */ |
7818 | if (DECL_ARTIFICIAL (result) && flag_weak) | |
7819 | comdat_linkage (result); | |
a7d87521 JM |
7820 | /* For WIN32 we also want to put explicit instantiations in |
7821 | linkonce sections. */ | |
1a408d07 | 7822 | else if (TREE_PUBLIC (result)) |
b385c841 | 7823 | maybe_make_one_only (result); |
faae18ab | 7824 | } |
f49422da MS |
7825 | else if (TREE_CODE (result) == FUNCTION_DECL) |
7826 | mark_inline_for_output (result); | |
faae18ab MS |
7827 | } |
7828 | ||
e1467ff2 MM |
7829 | /* Given two function templates PAT1 and PAT2, and explicit template |
7830 | arguments EXPLICIT_ARGS return: | |
6467930b MS |
7831 | |
7832 | 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order]. | |
7833 | -1 if PAT2 is more specialized than PAT1. | |
7834 | 0 if neither is more specialized. */ | |
7835 | ||
7836 | int | |
e1467ff2 MM |
7837 | more_specialized (pat1, pat2, explicit_args) |
7838 | tree pat1, pat2, explicit_args; | |
6467930b | 7839 | { |
98c1c668 | 7840 | tree targs; |
73aad9b9 | 7841 | int winner = 0; |
6467930b | 7842 | |
76b9a14d | 7843 | targs = get_bindings_overload (pat1, pat2, explicit_args); |
73aad9b9 | 7844 | if (targs) |
36a117a5 | 7845 | --winner; |
6467930b | 7846 | |
76b9a14d | 7847 | targs = get_bindings_overload (pat2, pat1, explicit_args); |
73aad9b9 | 7848 | if (targs) |
36a117a5 | 7849 | ++winner; |
6467930b | 7850 | |
73aad9b9 JM |
7851 | return winner; |
7852 | } | |
6467930b | 7853 | |
73aad9b9 | 7854 | /* Given two class template specialization list nodes PAT1 and PAT2, return: |
6467930b | 7855 | |
73aad9b9 JM |
7856 | 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order]. |
7857 | -1 if PAT2 is more specialized than PAT1. | |
7858 | 0 if neither is more specialized. */ | |
7859 | ||
7860 | int | |
7861 | more_specialized_class (pat1, pat2) | |
7862 | tree pat1, pat2; | |
7863 | { | |
7864 | tree targs; | |
7865 | int winner = 0; | |
7866 | ||
36a117a5 MM |
7867 | targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1), |
7868 | TREE_PURPOSE (pat2)); | |
73aad9b9 JM |
7869 | if (targs) |
7870 | --winner; | |
7871 | ||
36a117a5 MM |
7872 | targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2), |
7873 | TREE_PURPOSE (pat1)); | |
73aad9b9 | 7874 | if (targs) |
6467930b MS |
7875 | ++winner; |
7876 | ||
7877 | return winner; | |
7878 | } | |
73aad9b9 JM |
7879 | |
7880 | /* Return the template arguments that will produce the function signature | |
e1467ff2 | 7881 | DECL from the function template FN, with the explicit template |
76b9a14d JM |
7882 | arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must |
7883 | also match. */ | |
73aad9b9 | 7884 | |
76b9a14d JM |
7885 | static tree |
7886 | get_bindings_real (fn, decl, explicit_args, check_rettype) | |
e1467ff2 | 7887 | tree fn, decl, explicit_args; |
76b9a14d | 7888 | int check_rettype; |
73aad9b9 | 7889 | { |
98c1c668 | 7890 | int ntparms = DECL_NTPARMS (fn); |
e66d884e | 7891 | tree targs = make_scratch_vec (ntparms); |
d7684f2d MM |
7892 | tree decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); |
7893 | tree extra_fn_arg = NULL_TREE; | |
98c1c668 JM |
7894 | int i; |
7895 | ||
d7684f2d MM |
7896 | if (DECL_STATIC_FUNCTION_P (fn) |
7897 | && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)) | |
7898 | { | |
7899 | /* Sometimes we are trying to figure out what's being | |
7900 | specialized by a declaration that looks like a method, and it | |
7901 | turns out to be a static member function. */ | |
7902 | if (CLASSTYPE_TEMPLATE_INFO (DECL_REAL_CONTEXT (fn)) | |
7903 | && !is_member_template (fn)) | |
7904 | /* The natural thing to do here seems to be to remove the | |
7905 | spurious `this' parameter from the DECL, but that prevents | |
7906 | unification from making use of the class type. So, | |
7907 | instead, we have fn_type_unification add to the parameters | |
7908 | for FN. */ | |
7909 | extra_fn_arg = build_pointer_type (DECL_REAL_CONTEXT (fn)); | |
7910 | else | |
7911 | /* In this case, though, adding the extra_fn_arg can confuse | |
7912 | things, so we remove from decl_arg_types instead. */ | |
7913 | decl_arg_types = TREE_CHAIN (decl_arg_types); | |
7914 | } | |
7915 | ||
e1467ff2 | 7916 | i = fn_type_unification (fn, explicit_args, targs, |
d7684f2d | 7917 | decl_arg_types, |
98c1c668 | 7918 | TREE_TYPE (TREE_TYPE (decl)), |
830bfa74 | 7919 | DEDUCE_EXACT, |
d7684f2d | 7920 | extra_fn_arg); |
98c1c668 | 7921 | |
76b9a14d JM |
7922 | if (i != 0) |
7923 | return NULL_TREE; | |
7924 | ||
7925 | if (check_rettype) | |
e1467ff2 MM |
7926 | { |
7927 | /* Check to see that the resulting return type is also OK. */ | |
36a117a5 | 7928 | tree t = tsubst (TREE_TYPE (TREE_TYPE (fn)), targs, |
e6f1275f | 7929 | NULL_TREE); |
e1467ff2 | 7930 | |
3bfdc719 | 7931 | if (!same_type_p (t, TREE_TYPE (TREE_TYPE (decl)))) |
e1467ff2 | 7932 | return NULL_TREE; |
e1467ff2 MM |
7933 | } |
7934 | ||
76b9a14d JM |
7935 | return targs; |
7936 | } | |
7937 | ||
7938 | /* For most uses, we want to check the return type. */ | |
7939 | ||
7940 | tree | |
7941 | get_bindings (fn, decl, explicit_args) | |
7942 | tree fn, decl, explicit_args; | |
7943 | { | |
7944 | return get_bindings_real (fn, decl, explicit_args, 1); | |
7945 | } | |
7946 | ||
7947 | /* But for more_specialized, we only care about the parameter types. */ | |
7948 | ||
7949 | static tree | |
7950 | get_bindings_overload (fn, decl, explicit_args) | |
7951 | tree fn, decl, explicit_args; | |
7952 | { | |
7953 | return get_bindings_real (fn, decl, explicit_args, 0); | |
73aad9b9 JM |
7954 | } |
7955 | ||
36a117a5 MM |
7956 | /* Return the innermost template arguments that, when applied to a |
7957 | template specialization whose innermost template parameters are | |
7958 | TPARMS, and whose specialization arguments are ARGS, yield the | |
7959 | ARGS. | |
7960 | ||
7961 | For example, suppose we have: | |
7962 | ||
7963 | template <class T, class U> struct S {}; | |
7964 | template <class T> struct S<T*, int> {}; | |
7965 | ||
7966 | Then, suppose we want to get `S<double*, int>'. The TPARMS will be | |
7967 | {T}, the PARMS will be {T*, int} and the ARGS will be {double*, | |
7968 | int}. The resulting vector will be {double}, indicating that `T' | |
7969 | is bound to `double'. */ | |
7970 | ||
bd6dd845 | 7971 | static tree |
36a117a5 MM |
7972 | get_class_bindings (tparms, parms, args) |
7973 | tree tparms, parms, args; | |
73aad9b9 | 7974 | { |
3b3ba9f0 | 7975 | int i, ntparms = TREE_VEC_LENGTH (tparms); |
73aad9b9 JM |
7976 | tree vec = make_temp_vec (ntparms); |
7977 | ||
36a117a5 | 7978 | args = innermost_args (args); |
8d019cef | 7979 | |
73aad9b9 JM |
7980 | for (i = 0; i < TREE_VEC_LENGTH (parms); ++i) |
7981 | { | |
830bfa74 | 7982 | switch (unify (tparms, vec, |
050367a3 | 7983 | TREE_VEC_ELT (parms, i), TREE_VEC_ELT (args, i), |
830bfa74 | 7984 | UNIFY_ALLOW_NONE, 0)) |
73aad9b9 JM |
7985 | { |
7986 | case 0: | |
7987 | break; | |
7988 | case 1: | |
7989 | return NULL_TREE; | |
7990 | } | |
7991 | } | |
7992 | ||
7993 | for (i = 0; i < ntparms; ++i) | |
7994 | if (! TREE_VEC_ELT (vec, i)) | |
7995 | return NULL_TREE; | |
7996 | ||
7997 | return vec; | |
7998 | } | |
7999 | ||
104bf76a MM |
8000 | /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs. |
8001 | Pick the most specialized template, and return the corresponding | |
8002 | instantiation, or if there is no corresponding instantiation, the | |
8003 | template itself. EXPLICIT_ARGS is any template arguments explicity | |
8004 | mentioned in a template-id. If there is no most specialized | |
8005 | tempalte, error_mark_node is returned. If there are no templates | |
8006 | at all, NULL_TREE is returned. */ | |
73aad9b9 JM |
8007 | |
8008 | tree | |
104bf76a MM |
8009 | most_specialized_instantiation (instantiations, explicit_args) |
8010 | tree instantiations; | |
8011 | tree explicit_args; | |
73aad9b9 | 8012 | { |
104bf76a | 8013 | tree fn, champ; |
73aad9b9 JM |
8014 | int fate; |
8015 | ||
104bf76a | 8016 | if (!instantiations) |
73aad9b9 JM |
8017 | return NULL_TREE; |
8018 | ||
104bf76a MM |
8019 | champ = instantiations; |
8020 | for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn)) | |
73aad9b9 | 8021 | { |
104bf76a MM |
8022 | fate = more_specialized (TREE_VALUE (champ), |
8023 | TREE_VALUE (fn), explicit_args); | |
73aad9b9 JM |
8024 | if (fate == 1) |
8025 | ; | |
8026 | else | |
8027 | { | |
8028 | if (fate == 0) | |
8029 | { | |
8030 | fn = TREE_CHAIN (fn); | |
8031 | if (! fn) | |
8032 | return error_mark_node; | |
8033 | } | |
104bf76a | 8034 | champ = fn; |
73aad9b9 JM |
8035 | } |
8036 | } | |
8037 | ||
104bf76a | 8038 | for (fn = instantiations; fn && fn != champ; fn = TREE_CHAIN (fn)) |
73aad9b9 | 8039 | { |
104bf76a MM |
8040 | fate = more_specialized (TREE_VALUE (champ), |
8041 | TREE_VALUE (fn), explicit_args); | |
73aad9b9 JM |
8042 | if (fate != 1) |
8043 | return error_mark_node; | |
8044 | } | |
8045 | ||
104bf76a MM |
8046 | return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ); |
8047 | } | |
8048 | ||
8049 | /* Return the most specialized of the list of templates in FNS that can | |
8050 | produce an instantiation matching DECL, given the explicit template | |
8051 | arguments EXPLICIT_ARGS. */ | |
8052 | ||
8053 | tree | |
8054 | most_specialized (fns, decl, explicit_args) | |
8055 | tree fns, decl, explicit_args; | |
8056 | { | |
8057 | tree candidates = NULL_TREE; | |
8058 | tree fn, args; | |
8059 | ||
8060 | for (fn = fns; fn; fn = TREE_CHAIN (fn)) | |
8061 | { | |
8062 | tree candidate = TREE_VALUE (fn); | |
8063 | ||
8064 | args = get_bindings (candidate, decl, explicit_args); | |
8065 | if (args) | |
8066 | candidates = scratch_tree_cons (NULL_TREE, candidate, | |
8067 | candidates); | |
8068 | } | |
8069 | ||
8070 | return most_specialized_instantiation (candidates, explicit_args); | |
73aad9b9 JM |
8071 | } |
8072 | ||
36a117a5 MM |
8073 | /* If DECL is a specialization of some template, return the most |
8074 | general such template. For example, given: | |
8075 | ||
8076 | template <class T> struct S { template <class U> void f(U); }; | |
8077 | ||
8078 | if TMPL is `template <class U> void S<int>::f(U)' this will return | |
8079 | the full template. This function will not trace past partial | |
8080 | specializations, however. For example, given in addition: | |
8081 | ||
8082 | template <class T> struct S<T*> { template <class U> void f(U); }; | |
8083 | ||
8084 | if TMPL is `template <class U> void S<int*>::f(U)' this will return | |
8085 | `template <class T> template <class U> S<T*>::f(U)'. */ | |
73aad9b9 JM |
8086 | |
8087 | tree | |
36a117a5 MM |
8088 | most_general_template (decl) |
8089 | tree decl; | |
73aad9b9 | 8090 | { |
36a117a5 MM |
8091 | while (DECL_TEMPLATE_INFO (decl)) |
8092 | decl = DECL_TI_TEMPLATE (decl); | |
8093 | ||
8094 | return decl; | |
8095 | } | |
8096 | ||
8097 | /* Return the most specialized of the class template specializations | |
8098 | of TMPL which can produce an instantiation matching ARGS, or | |
8099 | error_mark_node if the choice is ambiguous. */ | |
8100 | ||
8101 | tree | |
8102 | most_specialized_class (tmpl, args) | |
8103 | tree tmpl; | |
8104 | tree args; | |
8105 | { | |
8106 | tree list = NULL_TREE; | |
8107 | tree t; | |
8108 | tree champ; | |
73aad9b9 JM |
8109 | int fate; |
8110 | ||
36a117a5 MM |
8111 | tmpl = most_general_template (tmpl); |
8112 | for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t)) | |
73aad9b9 | 8113 | { |
36a117a5 MM |
8114 | tree spec_args |
8115 | = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args); | |
8116 | if (spec_args) | |
73aad9b9 JM |
8117 | { |
8118 | list = decl_tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list); | |
8119 | TREE_TYPE (list) = TREE_TYPE (t); | |
8120 | } | |
8121 | } | |
8122 | ||
8123 | if (! list) | |
8124 | return NULL_TREE; | |
8125 | ||
8126 | t = list; | |
8127 | champ = t; | |
8128 | t = TREE_CHAIN (t); | |
8129 | for (; t; t = TREE_CHAIN (t)) | |
8130 | { | |
8131 | fate = more_specialized_class (champ, t); | |
8132 | if (fate == 1) | |
8133 | ; | |
8134 | else | |
8135 | { | |
8136 | if (fate == 0) | |
8137 | { | |
8138 | t = TREE_CHAIN (t); | |
8139 | if (! t) | |
8140 | return error_mark_node; | |
8141 | } | |
8142 | champ = t; | |
8143 | } | |
8144 | } | |
8145 | ||
8146 | for (t = list; t && t != champ; t = TREE_CHAIN (t)) | |
8147 | { | |
85b71cf2 | 8148 | fate = more_specialized_class (champ, t); |
73aad9b9 JM |
8149 | if (fate != 1) |
8150 | return error_mark_node; | |
8151 | } | |
8152 | ||
8153 | return champ; | |
8154 | } | |
8155 | ||
8d08fdba | 8156 | /* called from the parser. */ |
e92cc029 | 8157 | |
8d08fdba | 8158 | void |
6633d636 | 8159 | do_decl_instantiation (declspecs, declarator, storage) |
f0e01782 | 8160 | tree declspecs, declarator, storage; |
8d08fdba | 8161 | { |
c11b6f21 | 8162 | tree decl = grokdeclarator (declarator, declspecs, NORMAL, 0, NULL_TREE); |
8d08fdba | 8163 | tree result = NULL_TREE; |
faae18ab | 8164 | int extern_p = 0; |
e8abc66f | 8165 | |
ec255269 MS |
8166 | if (! DECL_LANG_SPECIFIC (decl)) |
8167 | { | |
8251199e | 8168 | cp_error ("explicit instantiation of non-template `%#D'", decl); |
ec255269 MS |
8169 | return; |
8170 | } | |
03d0f4af | 8171 | else if (TREE_CODE (decl) == VAR_DECL) |
6633d636 | 8172 | { |
03d0f4af MM |
8173 | /* There is an asymmetry here in the way VAR_DECLs and |
8174 | FUNCTION_DECLs are handled by grokdeclarator. In the case of | |
8175 | the latter, the DECL we get back will be marked as a | |
8176 | template instantiation, and the appropriate | |
8177 | DECL_TEMPLATE_INFO will be set up. This does not happen for | |
8178 | VAR_DECLs so we do the lookup here. Probably, grokdeclarator | |
8179 | should handle VAR_DECLs as it currently handles | |
8180 | FUNCTION_DECLs. */ | |
6633d636 MS |
8181 | result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, 0); |
8182 | if (result && TREE_CODE (result) != VAR_DECL) | |
03d0f4af | 8183 | { |
8251199e | 8184 | cp_error ("no matching template for `%D' found", result); |
03d0f4af MM |
8185 | return; |
8186 | } | |
6633d636 MS |
8187 | } |
8188 | else if (TREE_CODE (decl) != FUNCTION_DECL) | |
8189 | { | |
8251199e | 8190 | cp_error ("explicit instantiation of `%#D'", decl); |
6633d636 MS |
8191 | return; |
8192 | } | |
03d0f4af MM |
8193 | else |
8194 | result = decl; | |
672476cb | 8195 | |
03d0f4af MM |
8196 | /* Check for various error cases. Note that if the explicit |
8197 | instantiation is legal the RESULT will currently be marked as an | |
8198 | *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set | |
8199 | until we get here. */ | |
8200 | ||
8201 | if (DECL_TEMPLATE_SPECIALIZATION (result)) | |
672476cb | 8202 | { |
03d0f4af MM |
8203 | /* [temp.spec] |
8204 | ||
8205 | No program shall both explicitly instantiate and explicitly | |
8206 | specialize a template. */ | |
8251199e JM |
8207 | cp_error ("explicit instantiation of `%#D' after", result); |
8208 | cp_error_at ("explicit specialization here", result); | |
672476cb MM |
8209 | return; |
8210 | } | |
03d0f4af MM |
8211 | else if (DECL_EXPLICIT_INSTANTIATION (result)) |
8212 | { | |
8213 | /* [temp.spec] | |
98c1c668 | 8214 | |
03d0f4af MM |
8215 | No program shall explicitly instantiate any template more |
8216 | than once. | |
8217 | ||
8218 | We check DECL_INTERFACE_KNOWN so as not to complain when the | |
8219 | first instantiation was `extern' and the second is not, and | |
8220 | EXTERN_P for the opposite case. */ | |
8221 | if (DECL_INTERFACE_KNOWN (result) && !extern_p) | |
8251199e | 8222 | cp_error ("duplicate explicit instantiation of `%#D'", result); |
03d0f4af MM |
8223 | |
8224 | /* If we've already instantiated the template, just return now. */ | |
8225 | if (DECL_INTERFACE_KNOWN (result)) | |
8226 | return; | |
8227 | } | |
8228 | else if (!DECL_IMPLICIT_INSTANTIATION (result)) | |
faae18ab | 8229 | { |
8251199e | 8230 | cp_error ("no matching template for `%D' found", result); |
faae18ab MS |
8231 | return; |
8232 | } | |
03d0f4af | 8233 | else if (!DECL_TEMPLATE_INFO (result)) |
6633d636 | 8234 | { |
8251199e | 8235 | cp_pedwarn ("explicit instantiation of non-template `%#D'", result); |
6633d636 MS |
8236 | return; |
8237 | } | |
8238 | ||
a0a33927 MS |
8239 | if (flag_external_templates) |
8240 | return; | |
8241 | ||
f0e01782 | 8242 | if (storage == NULL_TREE) |
00595019 | 8243 | ; |
faae18ab | 8244 | else if (storage == ridpointers[(int) RID_EXTERN]) |
03d0f4af MM |
8245 | { |
8246 | if (pedantic) | |
8251199e | 8247 | cp_pedwarn ("ANSI C++ forbids the use of `extern' on explicit instantiations"); |
03d0f4af MM |
8248 | extern_p = 1; |
8249 | } | |
f0e01782 | 8250 | else |
8251199e | 8251 | cp_error ("storage class `%D' applied to template instantiation", |
f0e01782 | 8252 | storage); |
5566b478 | 8253 | |
03d0f4af | 8254 | SET_DECL_EXPLICIT_INSTANTIATION (result); |
5566b478 | 8255 | mark_decl_instantiated (result, extern_p); |
44a8d0b3 | 8256 | repo_template_instantiated (result, extern_p); |
c91a56d2 MS |
8257 | if (! extern_p) |
8258 | instantiate_decl (result); | |
7177d104 MS |
8259 | } |
8260 | ||
faae18ab MS |
8261 | void |
8262 | mark_class_instantiated (t, extern_p) | |
8263 | tree t; | |
8264 | int extern_p; | |
8265 | { | |
8266 | SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t); | |
eb773359 JM |
8267 | SET_CLASSTYPE_INTERFACE_KNOWN (t); |
8268 | CLASSTYPE_INTERFACE_ONLY (t) = extern_p; | |
faae18ab MS |
8269 | CLASSTYPE_VTABLE_NEEDS_WRITING (t) = ! extern_p; |
8270 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p; | |
8271 | if (! extern_p) | |
8272 | { | |
8273 | CLASSTYPE_DEBUG_REQUESTED (t) = 1; | |
8274 | rest_of_type_compilation (t, 1); | |
8275 | } | |
8276 | } | |
e8abc66f | 8277 | |
7177d104 | 8278 | void |
ca79f85d JM |
8279 | do_type_instantiation (t, storage) |
8280 | tree t, storage; | |
7177d104 | 8281 | { |
e8abc66f MS |
8282 | int extern_p = 0; |
8283 | int nomem_p = 0; | |
5566b478 MS |
8284 | int static_p = 0; |
8285 | ||
ca79f85d JM |
8286 | if (TREE_CODE (t) == TYPE_DECL) |
8287 | t = TREE_TYPE (t); | |
8288 | ||
7ddedda4 | 8289 | if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t)) |
ca79f85d | 8290 | { |
8251199e | 8291 | cp_error ("explicit instantiation of non-template type `%T'", t); |
ca79f85d JM |
8292 | return; |
8293 | } | |
8294 | ||
5566b478 | 8295 | complete_type (t); |
7177d104 | 8296 | |
a292b002 MS |
8297 | /* With -fexternal-templates, explicit instantiations are treated the same |
8298 | as implicit ones. */ | |
a0a33927 MS |
8299 | if (flag_external_templates) |
8300 | return; | |
8301 | ||
f0e01782 MS |
8302 | if (TYPE_SIZE (t) == NULL_TREE) |
8303 | { | |
8251199e | 8304 | cp_error ("explicit instantiation of `%#T' before definition of template", |
f0e01782 MS |
8305 | t); |
8306 | return; | |
8307 | } | |
8308 | ||
03d0f4af | 8309 | if (storage != NULL_TREE) |
f0e01782 | 8310 | { |
03d0f4af | 8311 | if (pedantic) |
8251199e JM |
8312 | cp_pedwarn("ANSI C++ forbids the use of `%s' on explicit instantiations", |
8313 | IDENTIFIER_POINTER (storage)); | |
03d0f4af MM |
8314 | |
8315 | if (storage == ridpointers[(int) RID_INLINE]) | |
8316 | nomem_p = 1; | |
8317 | else if (storage == ridpointers[(int) RID_EXTERN]) | |
8318 | extern_p = 1; | |
8319 | else if (storage == ridpointers[(int) RID_STATIC]) | |
8320 | static_p = 1; | |
8321 | else | |
8322 | { | |
8251199e | 8323 | cp_error ("storage class `%D' applied to template instantiation", |
03d0f4af MM |
8324 | storage); |
8325 | extern_p = 0; | |
8326 | } | |
f0e01782 MS |
8327 | } |
8328 | ||
03d0f4af MM |
8329 | if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)) |
8330 | { | |
8331 | /* [temp.spec] | |
a292b002 | 8332 | |
03d0f4af MM |
8333 | No program shall both explicitly instantiate and explicitly |
8334 | specialize a template. */ | |
8251199e JM |
8335 | cp_error ("explicit instantiation of `%#T' after", t); |
8336 | cp_error_at ("explicit specialization here", t); | |
03d0f4af MM |
8337 | return; |
8338 | } | |
8339 | else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t)) | |
44a8d0b3 | 8340 | { |
03d0f4af MM |
8341 | /* [temp.spec] |
8342 | ||
8343 | No program shall explicitly instantiate any template more | |
8344 | than once. | |
8345 | ||
8346 | If CLASSTYPE_INTERFACE_ONLY, then the first explicit | |
8347 | instantiation was `extern', and if EXTERN_P then the second | |
8348 | is. Both cases are OK. */ | |
8349 | if (!CLASSTYPE_INTERFACE_ONLY (t) && !extern_p) | |
8251199e | 8350 | cp_error ("duplicate explicit instantiation of `%#T'", t); |
03d0f4af MM |
8351 | |
8352 | /* If we've already instantiated the template, just return now. */ | |
8353 | if (!CLASSTYPE_INTERFACE_ONLY (t)) | |
8354 | return; | |
44a8d0b3 | 8355 | } |
e8abc66f | 8356 | |
03d0f4af MM |
8357 | mark_class_instantiated (t, extern_p); |
8358 | repo_template_instantiated (t, extern_p); | |
8359 | ||
e8abc66f MS |
8360 | if (nomem_p) |
8361 | return; | |
8362 | ||
7177d104 | 8363 | { |
db5ae43f | 8364 | tree tmp; |
5566b478 | 8365 | |
03d0f4af MM |
8366 | /* In contrast to implicit instantiation, where only the |
8367 | declarations, and not the definitions, of members are | |
8368 | instantiated, we have here: | |
8369 | ||
8370 | [temp.explicit] | |
8371 | ||
8372 | The explicit instantiation of a class template specialization | |
8373 | implies the instantiation of all of its members not | |
8374 | previously explicitly specialized in the translation unit | |
8375 | containing the explicit instantiation. | |
8376 | ||
8377 | Of course, we can't instantiate member template classes, since | |
8378 | we don't have any arguments for them. Note that the standard | |
8379 | is unclear on whether the instatiation of the members are | |
8380 | *explicit* instantiations or not. We choose to be generous, | |
8381 | and not set DECL_EXPLICIT_INSTANTIATION. Therefore, we allow | |
8382 | the explicit instantiation of a class where some of the members | |
8383 | have no definition in the current translation unit. */ | |
8384 | ||
5566b478 MS |
8385 | if (! static_p) |
8386 | for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
a7d87521 | 8387 | if (TREE_CODE (tmp) == FUNCTION_DECL |
1f109f0f | 8388 | && DECL_TEMPLATE_INSTANTIATION (tmp)) |
5566b478 MS |
8389 | { |
8390 | mark_decl_instantiated (tmp, extern_p); | |
8391 | repo_template_instantiated (tmp, extern_p); | |
8392 | if (! extern_p) | |
8393 | instantiate_decl (tmp); | |
8394 | } | |
8395 | ||
8396 | for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp)) | |
8397 | if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp)) | |
863adfc0 | 8398 | { |
5566b478 | 8399 | mark_decl_instantiated (tmp, extern_p); |
863adfc0 | 8400 | repo_template_instantiated (tmp, extern_p); |
5566b478 MS |
8401 | if (! extern_p) |
8402 | instantiate_decl (tmp); | |
863adfc0 | 8403 | } |
7177d104 | 8404 | |
a292b002 | 8405 | for (tmp = CLASSTYPE_TAGS (t); tmp; tmp = TREE_CHAIN (tmp)) |
e4a84209 MM |
8406 | if (IS_AGGR_TYPE (TREE_VALUE (tmp)) |
8407 | && !uses_template_parms (CLASSTYPE_TI_ARGS (TREE_VALUE (tmp)))) | |
f376e137 | 8408 | do_type_instantiation (TYPE_MAIN_DECL (TREE_VALUE (tmp)), storage); |
a292b002 | 8409 | } |
8d08fdba | 8410 | } |
a28e3c7f | 8411 | |
36a117a5 MM |
8412 | /* Given a function DECL, which is a specialization of TMPL, modify |
8413 | DECL to be a re-instantiation of TMPL with the same template | |
8414 | arguments. TMPL should be the template into which tsubst'ing | |
8415 | should occur for DECL, not the most general template. | |
830bfa74 MM |
8416 | |
8417 | One reason for doing this is a scenario like this: | |
8418 | ||
8419 | template <class T> | |
8420 | void f(const T&, int i); | |
8421 | ||
8422 | void g() { f(3, 7); } | |
8423 | ||
8424 | template <class T> | |
8425 | void f(const T& t, const int i) { } | |
8426 | ||
8427 | Note that when the template is first instantiated, with | |
8428 | instantiate_template, the resulting DECL will have no name for the | |
8429 | first parameter, and the wrong type for the second. So, when we go | |
8430 | to instantiate the DECL, we regenerate it. */ | |
8431 | ||
8432 | void | |
8433 | regenerate_decl_from_template (decl, tmpl) | |
8434 | tree decl; | |
8435 | tree tmpl; | |
8436 | { | |
8437 | tree args; | |
830bfa74 MM |
8438 | tree code_pattern; |
8439 | tree new_decl; | |
36a117a5 MM |
8440 | tree gen_tmpl; |
8441 | int unregistered; | |
830bfa74 MM |
8442 | |
8443 | args = DECL_TI_ARGS (decl); | |
8444 | code_pattern = DECL_TEMPLATE_RESULT (tmpl); | |
8445 | ||
8251199e JM |
8446 | /* Unregister the specialization so that when we tsubst we will not |
8447 | just return DECL. We don't have to unregister DECL from TMPL | |
8448 | because if would only be registered there if it were a partial | |
8449 | instantiation of a specialization, which it isn't: it's a full | |
8450 | instantiation. */ | |
36a117a5 MM |
8451 | gen_tmpl = most_general_template (tmpl); |
8452 | unregistered = unregister_specialization (decl, gen_tmpl); | |
8453 | ||
8454 | /* If the DECL was not unregistered then something peculiar is | |
8455 | happening: we created a specialization but did not call | |
8456 | register_specialization for it. */ | |
8457 | my_friendly_assert (unregistered, 0); | |
8458 | ||
61a127b3 MM |
8459 | if (TREE_CODE (decl) == VAR_DECL) |
8460 | /* Make sure that we can see identifiers, and compute access | |
8461 | correctly, for the class members used in the declaration of | |
8462 | this static variable. */ | |
8463 | pushclass (DECL_CONTEXT (decl), 2); | |
8464 | ||
d8c4447d MM |
8465 | /* Do the substitution to get the new declaration. */ |
8466 | new_decl = tsubst (code_pattern, args, NULL_TREE); | |
830bfa74 MM |
8467 | |
8468 | if (TREE_CODE (decl) == VAR_DECL) | |
8469 | { | |
8470 | /* Set up DECL_INITIAL, since tsubst doesn't. */ | |
830bfa74 | 8471 | DECL_INITIAL (new_decl) = |
d8c4447d | 8472 | tsubst_expr (DECL_INITIAL (code_pattern), args, |
830bfa74 | 8473 | DECL_TI_TEMPLATE (decl)); |
61a127b3 | 8474 | /* Pop the class context we pushed above. */ |
830bfa74 MM |
8475 | popclass (1); |
8476 | } | |
8477 | ||
8478 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
fbf1c34b MM |
8479 | { |
8480 | /* Convince duplicate_decls to use the DECL_ARGUMENTS from the | |
8481 | new decl. */ | |
8482 | DECL_INITIAL (new_decl) = error_mark_node; | |
8483 | /* And don't complain about a duplicate definition. */ | |
8484 | DECL_INITIAL (decl) = NULL_TREE; | |
8485 | } | |
36a117a5 MM |
8486 | |
8487 | /* The immediate parent of the new template is still whatever it was | |
8488 | before, even though tsubst sets DECL_TI_TEMPLATE up as the most | |
8489 | general template. We also reset the DECL_ASSEMBLER_NAME since | |
8490 | tsubst always calculates the name as if the function in question | |
8491 | were really a template instance, and sometimes, with friend | |
8492 | functions, this is not so. See tsubst_friend_function for | |
8493 | details. */ | |
8494 | DECL_TI_TEMPLATE (new_decl) = DECL_TI_TEMPLATE (decl); | |
8495 | DECL_ASSEMBLER_NAME (new_decl) = DECL_ASSEMBLER_NAME (decl); | |
8496 | DECL_RTL (new_decl) = DECL_RTL (decl); | |
8497 | ||
8498 | /* Call duplicate decls to merge the old and new declarations. */ | |
830bfa74 MM |
8499 | duplicate_decls (new_decl, decl); |
8500 | ||
36a117a5 MM |
8501 | /* Now, re-register the specialization. */ |
8502 | register_specialization (decl, gen_tmpl, args); | |
830bfa74 MM |
8503 | } |
8504 | ||
f84b4be9 JM |
8505 | /* Produce the definition of D, a _DECL generated from a template. */ |
8506 | ||
a28e3c7f | 8507 | tree |
5566b478 MS |
8508 | instantiate_decl (d) |
8509 | tree d; | |
a28e3c7f | 8510 | { |
36a117a5 MM |
8511 | tree tmpl = DECL_TI_TEMPLATE (d); |
8512 | tree args = DECL_TI_ARGS (d); | |
830bfa74 | 8513 | tree td; |
36a117a5 MM |
8514 | tree code_pattern; |
8515 | tree spec; | |
8516 | tree gen_tmpl; | |
5566b478 | 8517 | int nested = in_function_p (); |
5566b478 | 8518 | int pattern_defined; |
c27be9b9 JM |
8519 | int line = lineno; |
8520 | char *file = input_filename; | |
5566b478 | 8521 | |
36a117a5 MM |
8522 | /* This function should only be used to instantiate templates for |
8523 | functions and static member variables. */ | |
8524 | my_friendly_assert (TREE_CODE (d) == FUNCTION_DECL | |
8525 | || TREE_CODE (d) == VAR_DECL, 0); | |
8526 | ||
fbf1c34b | 8527 | if (DECL_TEMPLATE_INSTANTIATED (d)) |
03d0f4af MM |
8528 | /* D has already been instantiated. It might seem reasonable to |
8529 | check whether or not D is an explict instantiation, and, if so, | |
8530 | stop here. But when an explicit instantiation is deferred | |
8531 | until the end of the compilation, DECL_EXPLICIT_INSTANTIATION | |
8532 | is set, even though we still need to do the instantiation. */ | |
36a117a5 MM |
8533 | return d; |
8534 | ||
8535 | /* If we already have a specialization of this declaration, then | |
8536 | there's no reason to instantiate it. Note that | |
8537 | retrieve_specialization gives us both instantiations and | |
8538 | specializations, so we must explicitly check | |
8539 | DECL_TEMPLATE_SPECIALIZATION. */ | |
8540 | gen_tmpl = most_general_template (tmpl); | |
8541 | spec = retrieve_specialization (gen_tmpl, args); | |
8542 | if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec)) | |
8543 | return spec; | |
8544 | ||
8545 | /* This needs to happen before any tsubsting. */ | |
8546 | if (! push_tinst_level (d)) | |
8547 | return d; | |
8548 | ||
4d85e00e MM |
8549 | /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern |
8550 | for the instantiation. This is not always the most general | |
8551 | template. Consider, for example: | |
8552 | ||
8553 | template <class T> | |
8554 | struct S { template <class U> void f(); | |
8555 | template <> void f<int>(); }; | |
8556 | ||
8557 | and an instantiation of S<double>::f<int>. We want TD to be the | |
8558 | specialization S<T>::f<int>, not the more general S<T>::f<U>. */ | |
8559 | td = tmpl; | |
8560 | for (td = tmpl; | |
8561 | /* An instantiation cannot have a definition, so we need a | |
8562 | more general template. */ | |
8563 | DECL_TEMPLATE_INSTANTIATION (td) | |
8564 | /* We must also deal with friend templates. Given: | |
8565 | ||
8566 | template <class T> struct S { | |
8567 | template <class U> friend void f() {}; | |
8568 | }; | |
8569 | ||
8570 | S<int>::f<U> say, is not an instantiation of S<T>::f<U>, | |
8571 | so far as the language is concerned, but that's still | |
8572 | where we get the pattern for the instantiation from. On | |
8573 | ther hand, if the definition comes outside the class, say: | |
8574 | ||
8575 | template <class T> struct S { | |
8576 | template <class U> friend void f(); | |
8577 | }; | |
8578 | template <class U> friend void f() {} | |
8579 | ||
8580 | we don't need to look any further. That's what the check for | |
8581 | DECL_INITIAL is for. */ | |
8582 | || (TREE_CODE (d) == FUNCTION_DECL | |
61289ca3 | 8583 | && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (td) |
4d85e00e | 8584 | && !DECL_INITIAL (DECL_TEMPLATE_RESULT (td))); |
f84b4be9 | 8585 | ) |
4d85e00e MM |
8586 | { |
8587 | /* The present template, TD, should not be a definition. If it | |
8588 | were a definition, we should be using it! Note that we | |
8589 | cannot restructure the loop to just keep going until we find | |
8590 | a template with a definition, since that might go too far if | |
8591 | a specialization was declared, but not defined. */ | |
4d85e00e MM |
8592 | my_friendly_assert (!(TREE_CODE (d) == VAR_DECL |
8593 | && !DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (td))), | |
8594 | 0); | |
8595 | ||
8596 | /* Fetch the more general template. */ | |
8597 | td = DECL_TI_TEMPLATE (td); | |
8598 | } | |
27bb8339 | 8599 | |
fee23f54 | 8600 | code_pattern = DECL_TEMPLATE_RESULT (td); |
27bb8339 | 8601 | |
5566b478 | 8602 | if (TREE_CODE (d) == FUNCTION_DECL) |
36a117a5 | 8603 | pattern_defined = (DECL_INITIAL (code_pattern) != NULL_TREE); |
5566b478 | 8604 | else |
36a117a5 | 8605 | pattern_defined = ! DECL_IN_AGGR_P (code_pattern); |
de22184b MS |
8606 | |
8607 | push_to_top_level (); | |
8608 | lineno = DECL_SOURCE_LINE (d); | |
8609 | input_filename = DECL_SOURCE_FILE (d); | |
8610 | ||
de22184b | 8611 | if (pattern_defined) |
5566b478 MS |
8612 | { |
8613 | repo_template_used (d); | |
8614 | ||
8615 | if (flag_external_templates && ! DECL_INTERFACE_KNOWN (d)) | |
8616 | { | |
8617 | if (flag_alt_external_templates) | |
8618 | { | |
8619 | if (interface_unknown) | |
8620 | warn_if_unknown_interface (d); | |
8621 | } | |
fee23f54 | 8622 | else if (DECL_INTERFACE_KNOWN (code_pattern)) |
5566b478 MS |
8623 | { |
8624 | DECL_INTERFACE_KNOWN (d) = 1; | |
fee23f54 | 8625 | DECL_NOT_REALLY_EXTERN (d) = ! DECL_EXTERNAL (code_pattern); |
5566b478 MS |
8626 | } |
8627 | else | |
fee23f54 | 8628 | warn_if_unknown_interface (code_pattern); |
5566b478 MS |
8629 | } |
8630 | ||
e92cc029 | 8631 | if (at_eof) |
5566b478 MS |
8632 | import_export_decl (d); |
8633 | } | |
8634 | ||
c4ae3f91 JM |
8635 | /* Reject all external templates except inline functions. */ |
8636 | if (DECL_INTERFACE_KNOWN (d) | |
8637 | && ! DECL_NOT_REALLY_EXTERN (d) | |
8638 | && ! (TREE_CODE (d) == FUNCTION_DECL && DECL_INLINE (d))) | |
8639 | goto out; | |
8640 | ||
67ffc812 | 8641 | if (TREE_CODE (d) == VAR_DECL |
711734a9 | 8642 | && TREE_READONLY (d) |
67ffc812 MM |
8643 | && DECL_INITIAL (d) == NULL_TREE |
8644 | && DECL_INITIAL (code_pattern) != NULL_TREE) | |
8645 | /* We need to set up DECL_INITIAL regardless of pattern_defined if | |
8646 | the variable is a static const initialized in the class body. */; | |
8647 | else if (! pattern_defined | |
8648 | || (! (TREE_CODE (d) == FUNCTION_DECL && DECL_INLINE (d) && nested) | |
8649 | && ! at_eof)) | |
5566b478 | 8650 | { |
67ffc812 | 8651 | /* Defer all templates except inline functions used in another |
c27be9b9 JM |
8652 | function. We restore the source position here because it's used |
8653 | by add_pending_template. */ | |
8654 | lineno = line; | |
8655 | input_filename = file; | |
8656 | ||
03d0f4af MM |
8657 | if (at_eof && !pattern_defined |
8658 | && DECL_EXPLICIT_INSTANTIATION (d)) | |
8659 | /* [temp.explicit] | |
8660 | ||
8661 | The definition of a non-exported function template, a | |
8662 | non-exported member function template, or a non-exported | |
8663 | member function or static data member of a class template | |
8664 | shall be present in every translation unit in which it is | |
8665 | explicitly instantiated. */ | |
8251199e | 8666 | cp_error ("explicit instantiation of `%D' but no definition available", |
03d0f4af MM |
8667 | d); |
8668 | ||
5566b478 | 8669 | add_pending_template (d); |
de22184b | 8670 | goto out; |
5566b478 MS |
8671 | } |
8672 | ||
120722ac | 8673 | regenerate_decl_from_template (d, td); |
fbf1c34b | 8674 | DECL_TEMPLATE_INSTANTIATED (d) = 1; |
120722ac MM |
8675 | |
8676 | /* We already set the file and line above. Reset them now in case | |
8677 | they changed as a result of calling regenerate_decl_from_template. */ | |
5156628f MS |
8678 | lineno = DECL_SOURCE_LINE (d); |
8679 | input_filename = DECL_SOURCE_FILE (d); | |
8680 | ||
5566b478 MS |
8681 | if (TREE_CODE (d) == VAR_DECL) |
8682 | { | |
8683 | DECL_IN_AGGR_P (d) = 0; | |
8684 | if (DECL_INTERFACE_KNOWN (d)) | |
8685 | DECL_EXTERNAL (d) = ! DECL_NOT_REALLY_EXTERN (d); | |
8686 | else | |
8687 | { | |
8688 | DECL_EXTERNAL (d) = 1; | |
8689 | DECL_NOT_REALLY_EXTERN (d) = 1; | |
8690 | } | |
8691 | cp_finish_decl (d, DECL_INITIAL (d), NULL_TREE, 0, 0); | |
8692 | } | |
8693 | else if (TREE_CODE (d) == FUNCTION_DECL) | |
8694 | { | |
fee23f54 | 8695 | tree t = DECL_SAVED_TREE (code_pattern); |
5566b478 | 8696 | |
c11b6f21 | 8697 | start_function (NULL_TREE, d, NULL_TREE, 1); |
5566b478 MS |
8698 | store_parm_decls (); |
8699 | ||
e76a2646 MS |
8700 | if (t && TREE_CODE (t) == RETURN_INIT) |
8701 | { | |
8702 | store_return_init | |
8703 | (TREE_OPERAND (t, 0), | |
f7d98d58 | 8704 | tsubst_expr (TREE_OPERAND (t, 1), args, tmpl)); |
e76a2646 MS |
8705 | t = TREE_CHAIN (t); |
8706 | } | |
8707 | ||
5566b478 MS |
8708 | if (t && TREE_CODE (t) == CTOR_INITIALIZER) |
8709 | { | |
8710 | current_member_init_list | |
8711 | = tsubst_expr_values (TREE_OPERAND (t, 0), args); | |
8712 | current_base_init_list | |
8713 | = tsubst_expr_values (TREE_OPERAND (t, 1), args); | |
8714 | t = TREE_CHAIN (t); | |
8715 | } | |
8716 | ||
8717 | setup_vtbl_ptr (); | |
8718 | /* Always keep the BLOCK node associated with the outermost | |
956d6950 | 8719 | pair of curly braces of a function. These are needed |
5566b478 MS |
8720 | for correct operation of dwarfout.c. */ |
8721 | keep_next_level (); | |
8722 | ||
8723 | my_friendly_assert (TREE_CODE (t) == COMPOUND_STMT, 42); | |
f7d98d58 | 8724 | tsubst_expr (t, args, tmpl); |
a28e3c7f | 8725 | |
5566b478 | 8726 | finish_function (lineno, 0, nested); |
5566b478 MS |
8727 | } |
8728 | ||
de22184b | 8729 | out: |
c27be9b9 JM |
8730 | lineno = line; |
8731 | input_filename = file; | |
8732 | ||
5566b478 | 8733 | pop_from_top_level (); |
5566b478 | 8734 | pop_tinst_level (); |
a28e3c7f | 8735 | |
a28e3c7f MS |
8736 | return d; |
8737 | } | |
5566b478 | 8738 | |
824b9a4c | 8739 | static tree |
5566b478 MS |
8740 | tsubst_expr_values (t, argvec) |
8741 | tree t, argvec; | |
8742 | { | |
8743 | tree first = NULL_TREE; | |
8744 | tree *p = &first; | |
8745 | ||
8746 | for (; t; t = TREE_CHAIN (t)) | |
8747 | { | |
f7d98d58 JM |
8748 | tree pur = tsubst_copy (TREE_PURPOSE (t), argvec, NULL_TREE); |
8749 | tree val = tsubst_expr (TREE_VALUE (t), argvec, NULL_TREE); | |
5566b478 MS |
8750 | *p = build_tree_list (pur, val); |
8751 | p = &TREE_CHAIN (*p); | |
8752 | } | |
8753 | return first; | |
8754 | } | |
8755 | ||
8756 | tree last_tree; | |
8757 | ||
8758 | void | |
8759 | add_tree (t) | |
8760 | tree t; | |
8761 | { | |
8762 | last_tree = TREE_CHAIN (last_tree) = t; | |
8763 | } | |
73aad9b9 | 8764 | |
75650646 MM |
8765 | |
8766 | void | |
8767 | begin_tree () | |
8768 | { | |
8769 | saved_trees = tree_cons (NULL_TREE, last_tree, saved_trees); | |
8770 | last_tree = NULL_TREE; | |
8771 | } | |
8772 | ||
8773 | ||
8774 | void | |
8775 | end_tree () | |
8776 | { | |
8777 | my_friendly_assert (saved_trees != NULL_TREE, 0); | |
8778 | ||
8779 | last_tree = TREE_VALUE (saved_trees); | |
8780 | saved_trees = TREE_CHAIN (saved_trees); | |
8781 | } | |
8782 | ||
73aad9b9 JM |
8783 | /* D is an undefined function declaration in the presence of templates with |
8784 | the same name, listed in FNS. If one of them can produce D as an | |
8785 | instantiation, remember this so we can instantiate it at EOF if D has | |
8786 | not been defined by that time. */ | |
8787 | ||
8788 | void | |
8789 | add_maybe_template (d, fns) | |
8790 | tree d, fns; | |
8791 | { | |
8792 | tree t; | |
8793 | ||
8794 | if (DECL_MAYBE_TEMPLATE (d)) | |
8795 | return; | |
8796 | ||
e1467ff2 | 8797 | t = most_specialized (fns, d, NULL_TREE); |
73aad9b9 JM |
8798 | if (! t) |
8799 | return; | |
8800 | if (t == error_mark_node) | |
8801 | { | |
8251199e | 8802 | cp_error ("ambiguous template instantiation for `%D'", d); |
73aad9b9 JM |
8803 | return; |
8804 | } | |
8805 | ||
8806 | *maybe_template_tail = perm_tree_cons (t, d, NULL_TREE); | |
8807 | maybe_template_tail = &TREE_CHAIN (*maybe_template_tail); | |
8808 | DECL_MAYBE_TEMPLATE (d) = 1; | |
8809 | } | |
b87692e5 | 8810 | |
61a127b3 MM |
8811 | /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */ |
8812 | ||
8813 | static void | |
8814 | set_current_access_from_decl (decl) | |
8815 | tree decl; | |
8816 | { | |
8817 | if (TREE_PRIVATE (decl)) | |
8818 | current_access_specifier = access_private_node; | |
8819 | else if (TREE_PROTECTED (decl)) | |
8820 | current_access_specifier = access_protected_node; | |
8821 | else | |
8822 | current_access_specifier = access_public_node; | |
8823 | } | |
8824 | ||
dbfe2124 MM |
8825 | /* Instantiate an enumerated type. TAG is the template type, NEWTAG |
8826 | is the instantiation (which should have been created with | |
8827 | start_enum) and ARGS are the template arguments to use. */ | |
b87692e5 | 8828 | |
dbfe2124 MM |
8829 | static void |
8830 | tsubst_enum (tag, newtag, args) | |
8831 | tree tag; | |
8832 | tree newtag; | |
8833 | tree args; | |
b87692e5 | 8834 | { |
dbfe2124 | 8835 | tree e; |
b87692e5 MS |
8836 | |
8837 | for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e)) | |
8838 | { | |
61a127b3 MM |
8839 | tree value; |
8840 | tree elt; | |
8841 | ||
8842 | /* Note that in a template enum, the TREE_VALUE is the | |
8843 | CONST_DECL, not the corresponding INTEGER_CST. */ | |
8844 | value = tsubst_expr (DECL_INITIAL (TREE_VALUE (e)), | |
72f2bd78 | 8845 | args, |
61a127b3 MM |
8846 | NULL_TREE); |
8847 | ||
8848 | /* Give this enumeration constant the correct access. */ | |
8849 | set_current_access_from_decl (TREE_VALUE (e)); | |
8850 | ||
8851 | /* Actually build the enumerator itself. */ | |
8852 | elt = build_enumerator (TREE_PURPOSE (e), value, newtag); | |
b87692e5 | 8853 | |
dbfe2124 MM |
8854 | /* We save the enumerators we have built so far in the |
8855 | TYPE_VALUES so that if the enumeration constants for | |
8856 | subsequent enumerators involve those for previous ones, | |
8857 | tsubst_copy will be able to find them. */ | |
8858 | TREE_CHAIN (elt) = TYPE_VALUES (newtag); | |
8859 | TYPE_VALUES (newtag) = elt; | |
8860 | } | |
b3d5a58b | 8861 | |
dbfe2124 | 8862 | finish_enum (newtag); |
b87692e5 | 8863 | } |
36a117a5 MM |
8864 | |
8865 | /* Set the DECL_ASSEMBLER_NAME for DECL, which is a FUNCTION_DECL that | |
8866 | is either an instantiation or specialization of a template | |
8867 | function. */ | |
8868 | ||
8869 | static void | |
8870 | set_mangled_name_for_template_decl (decl) | |
8871 | tree decl; | |
8872 | { | |
8873 | tree saved_namespace; | |
b370501f | 8874 | tree context = NULL_TREE; |
36a117a5 MM |
8875 | tree fn_type; |
8876 | tree ret_type; | |
8877 | tree parm_types; | |
8878 | tree tparms; | |
8879 | tree targs; | |
8880 | tree tmpl; | |
8881 | int parm_depth; | |
8882 | ||
8883 | my_friendly_assert (TREE_CODE (decl) == FUNCTION_DECL, 0); | |
8884 | my_friendly_assert (DECL_TEMPLATE_INFO (decl) != NULL_TREE, 0); | |
8885 | ||
8886 | /* The names of template functions must be mangled so as to indicate | |
8887 | what template is being specialized with what template arguments. | |
8888 | For example, each of the following three functions must get | |
8889 | different mangled names: | |
8890 | ||
8891 | void f(int); | |
8892 | template <> void f<7>(int); | |
8893 | template <> void f<8>(int); */ | |
8894 | ||
8895 | targs = DECL_TI_ARGS (decl); | |
8896 | if (uses_template_parms (targs)) | |
8897 | /* This DECL is for a partial instantiation. There's no need to | |
8898 | mangle the name of such an entity. */ | |
8899 | return; | |
8900 | ||
8901 | tmpl = most_general_template (DECL_TI_TEMPLATE (decl)); | |
8902 | tparms = DECL_TEMPLATE_PARMS (tmpl); | |
8903 | parm_depth = TMPL_PARMS_DEPTH (tparms); | |
8904 | ||
8905 | /* There should be as many levels of arguments as there are levels | |
8906 | of parameters. */ | |
8907 | my_friendly_assert (parm_depth == TMPL_ARGS_DEPTH (targs), 0); | |
8908 | ||
8909 | /* We now compute the PARMS and RET_TYPE to give to | |
8910 | build_decl_overload_real. The PARMS and RET_TYPE are the | |
8911 | parameter and return types of the template, after all but the | |
8912 | innermost template arguments have been substituted, not the | |
8913 | parameter and return types of the function DECL. For example, | |
8914 | given: | |
8915 | ||
8916 | template <class T> T f(T); | |
8917 | ||
8918 | both PARMS and RET_TYPE should be `T' even if DECL is `int f(int)'. | |
8919 | A more subtle example is: | |
8920 | ||
8921 | template <class T> struct S { template <class U> void f(T, U); } | |
8922 | ||
8923 | Here, if DECL is `void S<int>::f(int, double)', PARMS should be | |
8924 | {int, U}. Thus, the args that we want to subsitute into the | |
8925 | return and parameter type for the function are those in TARGS, | |
8926 | with the innermost level omitted. */ | |
8927 | fn_type = TREE_TYPE (tmpl); | |
8928 | if (DECL_STATIC_FUNCTION_P (decl)) | |
61a127b3 | 8929 | context = DECL_CLASS_CONTEXT (decl); |
36a117a5 MM |
8930 | |
8931 | if (parm_depth == 1) | |
8932 | /* No substitution is necessary. */ | |
8933 | ; | |
8934 | else | |
8935 | { | |
8936 | int i; | |
8937 | tree partial_args; | |
8938 | ||
8939 | /* Replace the innermost level of the TARGS with NULL_TREEs to | |
8940 | let tsubst know not to subsitute for those parameters. */ | |
8941 | partial_args = make_temp_vec (TREE_VEC_LENGTH (targs)); | |
8942 | for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i) | |
8943 | SET_TMPL_ARGS_LEVEL (partial_args, i, | |
8944 | TMPL_ARGS_LEVEL (targs, i)); | |
8945 | SET_TMPL_ARGS_LEVEL (partial_args, | |
8946 | TMPL_ARGS_DEPTH (targs), | |
8947 | make_temp_vec (DECL_NTPARMS (tmpl))); | |
8948 | ||
8949 | /* Now, do the (partial) substitution to figure out the | |
8950 | appropriate function type. */ | |
8951 | fn_type = tsubst (fn_type, partial_args, NULL_TREE); | |
8952 | if (DECL_STATIC_FUNCTION_P (decl)) | |
8953 | context = tsubst (context, partial_args, NULL_TREE); | |
8954 | ||
8955 | /* Substitute into the template parameters to obtain the real | |
8956 | innermost set of parameters. This step is important if the | |
8957 | innermost set of template parameters contains value | |
8958 | parameters whose types depend on outer template parameters. */ | |
8959 | TREE_VEC_LENGTH (partial_args)--; | |
8960 | tparms = tsubst_template_parms (tparms, partial_args); | |
8961 | } | |
8962 | ||
8963 | /* Now, get the innermost parameters and arguments, and figure out | |
8964 | the parameter and return types. */ | |
8965 | tparms = INNERMOST_TEMPLATE_PARMS (tparms); | |
8966 | targs = innermost_args (targs); | |
8967 | ret_type = TREE_TYPE (fn_type); | |
8968 | parm_types = TYPE_ARG_TYPES (fn_type); | |
8969 | ||
8970 | /* For a static member function, we generate a fake `this' pointer, | |
8971 | for the purposes of mangling. This indicates of which class the | |
8972 | function is a member. Because of: | |
8973 | ||
8974 | [class.static] | |
8975 | ||
8976 | There shall not be a static and a nonstatic member function | |
8977 | with the same name and the same parameter types | |
8978 | ||
8979 | we don't have to worry that this will result in a clash with a | |
8980 | non-static member function. */ | |
8981 | if (DECL_STATIC_FUNCTION_P (decl)) | |
8982 | parm_types = hash_tree_chain (build_pointer_type (context), parm_types); | |
8983 | ||
8984 | /* There should be the same number of template parameters as | |
8985 | template arguments. */ | |
8986 | my_friendly_assert (TREE_VEC_LENGTH (tparms) == TREE_VEC_LENGTH (targs), | |
8987 | 0); | |
8988 | ||
8989 | /* If the template is in a namespace, we need to put that into the | |
8990 | mangled name. Unfortunately, build_decl_overload_real does not | |
8991 | get the decl to mangle, so it relies on the current | |
8992 | namespace. Therefore, we set that here temporarily. */ | |
8993 | my_friendly_assert (TREE_CODE_CLASS (TREE_CODE (decl)) == 'd', 980702); | |
8994 | saved_namespace = current_namespace; | |
8995 | current_namespace = CP_DECL_CONTEXT (decl); | |
8996 | ||
8997 | /* Actually set the DCL_ASSEMBLER_NAME. */ | |
8998 | DECL_ASSEMBLER_NAME (decl) | |
8999 | = build_decl_overload_real (DECL_NAME (decl), parm_types, ret_type, | |
9000 | tparms, targs, | |
9001 | DECL_FUNCTION_MEMBER_P (decl) | |
9002 | + DECL_CONSTRUCTOR_P (decl)); | |
9003 | ||
9004 | /* Restore the previously active namespace. */ | |
9005 | current_namespace = saved_namespace; | |
9006 | } |