1 /* Handle parameterized types (templates) for GNU C++.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing.
5 Rewritten by Jason Merrill (jason@cygnus.com).
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to
21 the Free Software Foundation, 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
24 /* Known bugs or deficiencies include:
26 all methods must be provided in header files; can't use a source
27 file that contains only the method templates and "just win". */
31 #include "coretypes.h"
35 #include "pointer-set.h"
39 #include "cp-objcp-common.h"
40 #include "tree-inline.h"
47 #include "tree-iterator.h"
49 /* The type of functions taking a tree, and some additional data, and
51 typedef int (*tree_fn_t) (tree, void*);
53 /* The PENDING_TEMPLATES is a TREE_LIST of templates whose
54 instantiations have been deferred, either because their definitions
55 were not yet available, or because we were putting off doing the work.
56 The TREE_PURPOSE of each entry is either a DECL (for a function or
57 static data member), or a TYPE (for a class) indicating what we are
58 hoping to instantiate. The TREE_VALUE is not used. */
59 static GTY(()) tree pending_templates;
60 static GTY(()) tree last_pending_template;
62 int processing_template_parmlist;
63 static int template_header_count;
65 static GTY(()) tree saved_trees;
66 static GTY(()) varray_type inline_parm_levels;
67 static size_t inline_parm_levels_used;
69 static GTY(()) tree current_tinst_level;
71 static GTY(()) tree saved_access_scope;
73 /* Live only within one (recursive) call to tsubst_expr. We use
74 this to pass the statement expression node from the STMT_EXPR
75 to the EXPR_STMT that is its result. */
76 static tree cur_stmt_expr;
78 /* A map from local variable declarations in the body of the template
79 presently being instantiated to the corresponding instantiated
81 static htab_t local_specializations;
83 #define UNIFY_ALLOW_NONE 0
84 #define UNIFY_ALLOW_MORE_CV_QUAL 1
85 #define UNIFY_ALLOW_LESS_CV_QUAL 2
86 #define UNIFY_ALLOW_DERIVED 4
87 #define UNIFY_ALLOW_INTEGER 8
88 #define UNIFY_ALLOW_OUTER_LEVEL 16
89 #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32
90 #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64
92 static void push_access_scope (tree);
93 static void pop_access_scope (tree);
94 static int resolve_overloaded_unification (tree, tree, tree, tree,
95 unification_kind_t, int);
96 static int try_one_overload (tree, tree, tree, tree, tree,
97 unification_kind_t, int, bool);
98 static int unify (tree, tree, tree, tree, int);
99 static void add_pending_template (tree);
100 static void reopen_tinst_level (tree);
101 static tree classtype_mangled_name (tree);
102 static char* mangle_class_name_for_template (const char *, tree, tree);
103 static tree tsubst_initializer_list (tree, tree);
104 static tree get_class_bindings (tree, tree, tree);
105 static tree coerce_template_parms (tree, tree, tree, tsubst_flags_t, int);
106 static void tsubst_enum (tree, tree, tree);
107 static tree add_to_template_args (tree, tree);
108 static tree add_outermost_template_args (tree, tree);
109 static bool check_instantiated_args (tree, tree, tsubst_flags_t);
110 static int maybe_adjust_types_for_deduction (unification_kind_t, tree*, tree*);
111 static int type_unification_real (tree, tree, tree, tree,
112 int, unification_kind_t, int);
113 static void note_template_header (int);
114 static tree convert_nontype_argument_function (tree, tree);
115 static tree convert_nontype_argument (tree, tree);
116 static tree convert_template_argument (tree, tree, tree,
117 tsubst_flags_t, int, tree);
118 static int for_each_template_parm (tree, tree_fn_t, void*,
119 struct pointer_set_t*);
120 static tree build_template_parm_index (int, int, int, tree, tree);
121 static int inline_needs_template_parms (tree);
122 static void push_inline_template_parms_recursive (tree, int);
123 static tree retrieve_local_specialization (tree);
124 static void register_local_specialization (tree, tree);
125 static tree reduce_template_parm_level (tree, tree, int);
126 static int mark_template_parm (tree, void *);
127 static int template_parm_this_level_p (tree, void *);
128 static tree tsubst_friend_function (tree, tree);
129 static tree tsubst_friend_class (tree, tree);
130 static int can_complete_type_without_circularity (tree);
131 static tree get_bindings (tree, tree, tree, bool);
132 static int template_decl_level (tree);
133 static int check_cv_quals_for_unify (int, tree, tree);
134 static tree tsubst_template_arg (tree, tree, tsubst_flags_t, tree);
135 static tree tsubst_template_args (tree, tree, tsubst_flags_t, tree);
136 static tree tsubst_template_parms (tree, tree, tsubst_flags_t);
137 static void regenerate_decl_from_template (tree, tree);
138 static tree most_specialized (tree, tree, tree);
139 static tree most_specialized_class (tree, tree);
140 static int template_class_depth_real (tree, int);
141 static tree tsubst_aggr_type (tree, tree, tsubst_flags_t, tree, int);
142 static tree tsubst_arg_types (tree, tree, tsubst_flags_t, tree);
143 static tree tsubst_function_type (tree, tree, tsubst_flags_t, tree);
144 static void check_specialization_scope (void);
145 static tree process_partial_specialization (tree);
146 static void set_current_access_from_decl (tree);
147 static void check_default_tmpl_args (tree, tree, int, int);
148 static tree tsubst_call_declarator_parms (tree, tree, tsubst_flags_t, tree);
149 static tree get_template_base (tree, tree, tree, tree);
150 static int verify_class_unification (tree, tree, tree);
151 static tree try_class_unification (tree, tree, tree, tree);
152 static int coerce_template_template_parms (tree, tree, tsubst_flags_t,
154 static tree determine_specialization (tree, tree, tree *, int, int);
155 static int template_args_equal (tree, tree);
156 static void tsubst_default_arguments (tree);
157 static tree for_each_template_parm_r (tree *, int *, void *);
158 static tree copy_default_args_to_explicit_spec_1 (tree, tree);
159 static void copy_default_args_to_explicit_spec (tree);
160 static int invalid_nontype_parm_type_p (tree, tsubst_flags_t);
161 static int eq_local_specializations (const void *, const void *);
162 static bool dependent_type_p_r (tree);
163 static tree tsubst (tree, tree, tsubst_flags_t, tree);
164 static tree tsubst_expr (tree, tree, tsubst_flags_t, tree);
165 static tree tsubst_copy (tree, tree, tsubst_flags_t, tree);
167 /* Make the current scope suitable for access checking when we are
168 processing T. T can be FUNCTION_DECL for instantiated function
169 template, or VAR_DECL for static member variable (need by
170 instantiate_decl). */
173 push_access_scope (tree t)
175 gcc_assert (TREE_CODE (t) == FUNCTION_DECL
176 || TREE_CODE (t) == VAR_DECL);
178 if (DECL_FRIEND_CONTEXT (t))
179 push_nested_class (DECL_FRIEND_CONTEXT (t));
180 else if (DECL_CLASS_SCOPE_P (t))
181 push_nested_class (DECL_CONTEXT (t));
183 push_to_top_level ();
185 if (TREE_CODE (t) == FUNCTION_DECL)
187 saved_access_scope = tree_cons
188 (NULL_TREE, current_function_decl, saved_access_scope);
189 current_function_decl = t;
193 /* Restore the scope set up by push_access_scope. T is the node we
197 pop_access_scope (tree t)
199 if (TREE_CODE (t) == FUNCTION_DECL)
201 current_function_decl = TREE_VALUE (saved_access_scope);
202 saved_access_scope = TREE_CHAIN (saved_access_scope);
205 if (DECL_FRIEND_CONTEXT (t) || DECL_CLASS_SCOPE_P (t))
208 pop_from_top_level ();
211 /* Do any processing required when DECL (a member template
212 declaration) is finished. Returns the TEMPLATE_DECL corresponding
213 to DECL, unless it is a specialization, in which case the DECL
214 itself is returned. */
217 finish_member_template_decl (tree decl)
219 if (decl == error_mark_node)
220 return error_mark_node;
222 gcc_assert (DECL_P (decl));
224 if (TREE_CODE (decl) == TYPE_DECL)
228 type = TREE_TYPE (decl);
229 if (IS_AGGR_TYPE (type)
230 && CLASSTYPE_TEMPLATE_INFO (type)
231 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (type))
233 tree tmpl = CLASSTYPE_TI_TEMPLATE (type);
234 check_member_template (tmpl);
239 else if (TREE_CODE (decl) == FIELD_DECL)
240 error ("data member %qD cannot be a member template", decl);
241 else if (DECL_TEMPLATE_INFO (decl))
243 if (!DECL_TEMPLATE_SPECIALIZATION (decl))
245 check_member_template (DECL_TI_TEMPLATE (decl));
246 return DECL_TI_TEMPLATE (decl);
252 error ("invalid member template declaration %qD", decl);
254 return error_mark_node;
257 /* Returns the template nesting level of the indicated class TYPE.
267 A<T>::B<U> has depth two, while A<T> has depth one.
268 Both A<T>::B<int> and A<int>::B<U> have depth one, if
269 COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not
272 This function is guaranteed to return 0 if passed NULL_TREE so
273 that, for example, `template_class_depth (current_class_type)' is
277 template_class_depth_real (tree type, int count_specializations)
282 type && TREE_CODE (type) != NAMESPACE_DECL;
283 type = (TREE_CODE (type) == FUNCTION_DECL)
284 ? CP_DECL_CONTEXT (type) : TYPE_CONTEXT (type))
286 if (TREE_CODE (type) != FUNCTION_DECL)
288 if (CLASSTYPE_TEMPLATE_INFO (type)
289 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type))
290 && ((count_specializations
291 && CLASSTYPE_TEMPLATE_SPECIALIZATION (type))
292 || uses_template_parms (CLASSTYPE_TI_ARGS (type))))
297 if (DECL_TEMPLATE_INFO (type)
298 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type))
299 && ((count_specializations
300 && DECL_TEMPLATE_SPECIALIZATION (type))
301 || uses_template_parms (DECL_TI_ARGS (type))))
309 /* Returns the template nesting level of the indicated class TYPE.
310 Like template_class_depth_real, but instantiations do not count in
314 template_class_depth (tree type)
316 return template_class_depth_real (type, /*count_specializations=*/0);
319 /* Returns 1 if processing DECL as part of do_pending_inlines
320 needs us to push template parms. */
323 inline_needs_template_parms (tree decl)
325 if (! DECL_TEMPLATE_INFO (decl))
328 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl)))
329 > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl)));
332 /* Subroutine of maybe_begin_member_template_processing.
333 Push the template parms in PARMS, starting from LEVELS steps into the
334 chain, and ending at the beginning, since template parms are listed
338 push_inline_template_parms_recursive (tree parmlist, int levels)
340 tree parms = TREE_VALUE (parmlist);
344 push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1);
346 ++processing_template_decl;
347 current_template_parms
348 = tree_cons (size_int (processing_template_decl),
349 parms, current_template_parms);
350 TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1;
352 begin_scope (TREE_VEC_LENGTH (parms) ? sk_template_parms : sk_template_spec,
354 for (i = 0; i < TREE_VEC_LENGTH (parms); ++i)
356 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
357 gcc_assert (DECL_P (parm));
359 switch (TREE_CODE (parm))
368 /* Make a CONST_DECL as is done in process_template_parm.
369 It is ugly that we recreate this here; the original
370 version built in process_template_parm is no longer
372 tree decl = build_decl (CONST_DECL, DECL_NAME (parm),
374 DECL_ARTIFICIAL (decl) = 1;
375 TREE_CONSTANT (decl) = 1;
376 TREE_INVARIANT (decl) = 1;
377 TREE_READONLY (decl) = 1;
378 DECL_INITIAL (decl) = DECL_INITIAL (parm);
379 SET_DECL_TEMPLATE_PARM_P (decl);
390 /* Restore the template parameter context for a member template or
391 a friend template defined in a class definition. */
394 maybe_begin_member_template_processing (tree decl)
399 if (inline_needs_template_parms (decl))
401 parms = DECL_TEMPLATE_PARMS (most_general_template (decl));
402 levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl;
404 if (DECL_TEMPLATE_SPECIALIZATION (decl))
407 parms = TREE_CHAIN (parms);
410 push_inline_template_parms_recursive (parms, levels);
413 /* Remember how many levels of template parameters we pushed so that
414 we can pop them later. */
415 if (!inline_parm_levels)
416 VARRAY_INT_INIT (inline_parm_levels, 4, "inline_parm_levels");
417 if (inline_parm_levels_used == inline_parm_levels->num_elements)
418 VARRAY_GROW (inline_parm_levels, 2 * inline_parm_levels_used);
419 VARRAY_INT (inline_parm_levels, inline_parm_levels_used) = levels;
420 ++inline_parm_levels_used;
423 /* Undo the effects of maybe_begin_member_template_processing. */
426 maybe_end_member_template_processing (void)
430 if (!inline_parm_levels_used)
433 --inline_parm_levels_used;
435 i < VARRAY_INT (inline_parm_levels, inline_parm_levels_used);
438 --processing_template_decl;
439 current_template_parms = TREE_CHAIN (current_template_parms);
444 /* Return a new template argument vector which contains all of ARGS,
445 but has as its innermost set of arguments the EXTRA_ARGS. */
448 add_to_template_args (tree args, tree extra_args)
455 extra_depth = TMPL_ARGS_DEPTH (extra_args);
456 new_args = make_tree_vec (TMPL_ARGS_DEPTH (args) + extra_depth);
458 for (i = 1; i <= TMPL_ARGS_DEPTH (args); ++i)
459 SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (args, i));
461 for (j = 1; j <= extra_depth; ++j, ++i)
462 SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (extra_args, j));
467 /* Like add_to_template_args, but only the outermost ARGS are added to
468 the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH
469 (EXTRA_ARGS) levels are added. This function is used to combine
470 the template arguments from a partial instantiation with the
471 template arguments used to attain the full instantiation from the
472 partial instantiation. */
475 add_outermost_template_args (tree args, tree extra_args)
479 /* If there are more levels of EXTRA_ARGS than there are ARGS,
480 something very fishy is going on. */
481 gcc_assert (TMPL_ARGS_DEPTH (args) >= TMPL_ARGS_DEPTH (extra_args));
483 /* If *all* the new arguments will be the EXTRA_ARGS, just return
485 if (TMPL_ARGS_DEPTH (args) == TMPL_ARGS_DEPTH (extra_args))
488 /* For the moment, we make ARGS look like it contains fewer levels. */
489 TREE_VEC_LENGTH (args) -= TMPL_ARGS_DEPTH (extra_args);
491 new_args = add_to_template_args (args, extra_args);
493 /* Now, we restore ARGS to its full dimensions. */
494 TREE_VEC_LENGTH (args) += TMPL_ARGS_DEPTH (extra_args);
499 /* Return the N levels of innermost template arguments from the ARGS. */
502 get_innermost_template_args (tree args, int n)
510 /* If N is 1, just return the innermost set of template arguments. */
512 return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args));
514 /* If we're not removing anything, just return the arguments we were
516 extra_levels = TMPL_ARGS_DEPTH (args) - n;
517 gcc_assert (extra_levels >= 0);
518 if (extra_levels == 0)
521 /* Make a new set of arguments, not containing the outer arguments. */
522 new_args = make_tree_vec (n);
523 for (i = 1; i <= n; ++i)
524 SET_TMPL_ARGS_LEVEL (new_args, i,
525 TMPL_ARGS_LEVEL (args, i + extra_levels));
530 /* We've got a template header coming up; push to a new level for storing
534 begin_template_parm_list (void)
536 /* We use a non-tag-transparent scope here, which causes pushtag to
537 put tags in this scope, rather than in the enclosing class or
538 namespace scope. This is the right thing, since we want
539 TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a
540 global template class, push_template_decl handles putting the
541 TEMPLATE_DECL into top-level scope. For a nested template class,
544 template <class T> struct S1 {
545 template <class T> struct S2 {};
548 pushtag contains special code to call pushdecl_with_scope on the
549 TEMPLATE_DECL for S2. */
550 begin_scope (sk_template_parms, NULL);
551 ++processing_template_decl;
552 ++processing_template_parmlist;
553 note_template_header (0);
556 /* This routine is called when a specialization is declared. If it is
557 invalid to declare a specialization here, an error is reported. */
560 check_specialization_scope (void)
562 tree scope = current_scope ();
566 An explicit specialization shall be declared in the namespace of
567 which the template is a member, or, for member templates, in the
568 namespace of which the enclosing class or enclosing class
569 template is a member. An explicit specialization of a member
570 function, member class or static data member of a class template
571 shall be declared in the namespace of which the class template
573 if (scope && TREE_CODE (scope) != NAMESPACE_DECL)
574 error ("explicit specialization in non-namespace scope %qD", scope);
578 In an explicit specialization declaration for a member of a class
579 template or a member template that appears in namespace scope,
580 the member template and some of its enclosing class templates may
581 remain unspecialized, except that the declaration shall not
582 explicitly specialize a class member template if its enclosing
583 class templates are not explicitly specialized as well. */
584 if (current_template_parms)
585 error ("enclosing class templates are not explicitly specialized");
588 /* We've just seen template <>. */
591 begin_specialization (void)
593 begin_scope (sk_template_spec, NULL);
594 note_template_header (1);
595 check_specialization_scope ();
598 /* Called at then end of processing a declaration preceded by
602 end_specialization (void)
605 reset_specialization ();
608 /* Any template <>'s that we have seen thus far are not referring to a
609 function specialization. */
612 reset_specialization (void)
614 processing_specialization = 0;
615 template_header_count = 0;
618 /* We've just seen a template header. If SPECIALIZATION is nonzero,
619 it was of the form template <>. */
622 note_template_header (int specialization)
624 processing_specialization = specialization;
625 template_header_count++;
628 /* We're beginning an explicit instantiation. */
631 begin_explicit_instantiation (void)
633 gcc_assert (!processing_explicit_instantiation);
634 processing_explicit_instantiation = true;
639 end_explicit_instantiation (void)
641 gcc_assert (processing_explicit_instantiation);
642 processing_explicit_instantiation = false;
645 /* A explicit specialization or partial specialization TMPL is being
646 declared. Check that the namespace in which the specialization is
647 occurring is permissible. Returns false iff it is invalid to
648 specialize TMPL in the current namespace. */
651 check_specialization_namespace (tree tmpl)
653 tree tpl_ns = decl_namespace_context (tmpl);
657 An explicit specialization shall be declared in the namespace of
658 which the template is a member, or, for member templates, in the
659 namespace of which the enclosing class or enclosing class
660 template is a member. An explicit specialization of a member
661 function, member class or static data member of a class template
662 shall be declared in the namespace of which the class template is
664 if (is_associated_namespace (current_namespace, tpl_ns))
665 /* Same or super-using namespace. */
669 pedwarn ("specialization of %qD in different namespace", tmpl);
670 cp_pedwarn_at (" from definition of %q#D", tmpl);
675 /* The TYPE is being declared. If it is a template type, that means it
676 is a partial specialization. Do appropriate error-checking. */
679 maybe_process_partial_specialization (tree type)
681 /* TYPE maybe an ERROR_MARK_NODE. */
682 tree context = TYPE_P (type) ? TYPE_CONTEXT (type) : NULL_TREE;
684 if (CLASS_TYPE_P (type) && CLASSTYPE_USE_TEMPLATE (type))
686 /* This is for ordinary explicit specialization and partial
687 specialization of a template class such as:
689 template <> class C<int>;
693 template <class T> class C<T*>;
695 Make sure that `C<int>' and `C<T*>' are implicit instantiations. */
697 if (CLASSTYPE_IMPLICIT_INSTANTIATION (type)
698 && !COMPLETE_TYPE_P (type))
700 check_specialization_namespace (CLASSTYPE_TI_TEMPLATE (type));
701 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type);
702 if (processing_template_decl)
703 push_template_decl (TYPE_MAIN_DECL (type));
705 else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type))
706 error ("specialization of %qT after instantiation", type);
708 else if (CLASS_TYPE_P (type)
709 && !CLASSTYPE_USE_TEMPLATE (type)
710 && CLASSTYPE_TEMPLATE_INFO (type)
711 && context && CLASS_TYPE_P (context)
712 && CLASSTYPE_TEMPLATE_INFO (context))
714 /* This is for an explicit specialization of member class
715 template according to [temp.expl.spec/18]:
717 template <> template <class U> class C<int>::D;
719 The context `C<int>' must be an implicit instantiation.
720 Otherwise this is just a member class template declared
723 template <> class C<int> { template <class U> class D; };
724 template <> template <class U> class C<int>::D;
726 In the first case, `C<int>::D' is a specialization of `C<T>::D'
727 while in the second case, `C<int>::D' is a primary template
728 and `C<T>::D' may not exist. */
730 if (CLASSTYPE_IMPLICIT_INSTANTIATION (context)
731 && !COMPLETE_TYPE_P (type))
735 if (current_namespace
736 != decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type)))
738 pedwarn ("specializing %q#T in different namespace", type);
739 cp_pedwarn_at (" from definition of %q#D",
740 CLASSTYPE_TI_TEMPLATE (type));
743 /* Check for invalid specialization after instantiation:
745 template <> template <> class C<int>::D<int>;
746 template <> template <class U> class C<int>::D; */
748 for (t = DECL_TEMPLATE_INSTANTIATIONS
749 (most_general_template (CLASSTYPE_TI_TEMPLATE (type)));
750 t; t = TREE_CHAIN (t))
751 if (TREE_VALUE (t) != type
752 && TYPE_CONTEXT (TREE_VALUE (t)) == context)
753 error ("specialization %qT after instantiation %qT",
754 type, TREE_VALUE (t));
756 /* Mark TYPE as a specialization. And as a result, we only
757 have one level of template argument for the innermost
759 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type);
760 CLASSTYPE_TI_ARGS (type)
761 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type));
764 else if (processing_specialization)
765 error ("explicit specialization of non-template %qT", type);
768 /* Returns nonzero if we can optimize the retrieval of specializations
769 for TMPL, a TEMPLATE_DECL. In particular, for such a template, we
770 do not use DECL_TEMPLATE_SPECIALIZATIONS at all. */
773 optimize_specialization_lookup_p (tree tmpl)
775 return (DECL_FUNCTION_TEMPLATE_P (tmpl)
776 && DECL_CLASS_SCOPE_P (tmpl)
777 /* DECL_CLASS_SCOPE_P holds of T::f even if T is a template
779 && CLASS_TYPE_P (DECL_CONTEXT (tmpl))
780 /* The optimized lookup depends on the fact that the
781 template arguments for the member function template apply
782 purely to the containing class, which is not true if the
783 containing class is an explicit or partial
785 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (tmpl))
786 && !DECL_MEMBER_TEMPLATE_P (tmpl)
787 && !DECL_CONV_FN_P (tmpl)
788 /* It is possible to have a template that is not a member
789 template and is not a member of a template class:
791 template <typename T>
792 struct S { friend A::f(); };
794 Here, the friend function is a template, but the context does
795 not have template information. The optimized lookup relies
796 on having ARGS be the template arguments for both the class
797 and the function template. */
798 && !DECL_FRIEND_P (DECL_TEMPLATE_RESULT (tmpl)));
801 /* Retrieve the specialization (in the sense of [temp.spec] - a
802 specialization is either an instantiation or an explicit
803 specialization) of TMPL for the given template ARGS. If there is
804 no such specialization, return NULL_TREE. The ARGS are a vector of
805 arguments, or a vector of vectors of arguments, in the case of
806 templates with more than one level of parameters.
808 If TMPL is a type template and CLASS_SPECIALIZATIONS_P is true,
809 then we search for a partial specialization matching ARGS. This
810 parameter is ignored if TMPL is not a class template. */
813 retrieve_specialization (tree tmpl, tree args,
814 bool class_specializations_p)
816 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
818 /* There should be as many levels of arguments as there are
819 levels of parameters. */
820 gcc_assert (TMPL_ARGS_DEPTH (args)
821 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)));
823 if (optimize_specialization_lookup_p (tmpl))
826 tree class_specialization;
827 VEC(tree,gc) *methods;
831 /* The template arguments actually apply to the containing
832 class. Find the class specialization with those
834 class_template = CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (tmpl));
836 = retrieve_specialization (class_template, args,
837 /*class_specializations_p=*/false);
838 if (!class_specialization)
840 /* Now, find the appropriate entry in the CLASSTYPE_METHOD_VEC
841 for the specialization. */
842 idx = class_method_index_for_fn (class_specialization, tmpl);
845 /* Iterate through the methods with the indicated name, looking
846 for the one that has an instance of TMPL. */
847 methods = CLASSTYPE_METHOD_VEC (class_specialization);
848 for (fns = VEC_index (tree, methods, idx); fns; fns = OVL_NEXT (fns))
850 tree fn = OVL_CURRENT (fns);
851 if (DECL_TEMPLATE_INFO (fn) && DECL_TI_TEMPLATE (fn) == tmpl)
861 /* Class templates store their instantiations on the
862 DECL_TEMPLATE_INSTANTIATIONS list; other templates use the
863 DECL_TEMPLATE_SPECIALIZATIONS list. */
864 if (!class_specializations_p
865 && TREE_CODE (DECL_TEMPLATE_RESULT (tmpl)) == TYPE_DECL)
866 sp = &DECL_TEMPLATE_INSTANTIATIONS (tmpl);
868 sp = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
870 /* Iterate through the list until we find a matching template. */
871 while (*sp != NULL_TREE)
875 if (comp_template_args (TREE_PURPOSE (spec), args))
877 /* Use the move-to-front heuristic to speed up future
881 *sp = TREE_CHAIN (*sp);
882 TREE_CHAIN (spec) = *head;
885 return TREE_VALUE (spec);
887 sp = &TREE_CHAIN (spec);
894 /* Like retrieve_specialization, but for local declarations. */
897 retrieve_local_specialization (tree tmpl)
899 tree spec = htab_find_with_hash (local_specializations, tmpl,
900 htab_hash_pointer (tmpl));
901 return spec ? TREE_PURPOSE (spec) : NULL_TREE;
904 /* Returns nonzero iff DECL is a specialization of TMPL. */
907 is_specialization_of (tree decl, tree tmpl)
911 if (TREE_CODE (decl) == FUNCTION_DECL)
915 t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE)
921 gcc_assert (TREE_CODE (decl) == TYPE_DECL);
923 for (t = TREE_TYPE (decl);
925 t = CLASSTYPE_USE_TEMPLATE (t)
926 ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE)
927 if (same_type_ignoring_top_level_qualifiers_p (t, TREE_TYPE (tmpl)))
934 /* Returns nonzero iff DECL is a specialization of friend declaration
935 FRIEND according to [temp.friend]. */
938 is_specialization_of_friend (tree decl, tree friend)
940 bool need_template = true;
943 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
944 || TREE_CODE (decl) == TYPE_DECL);
946 /* For [temp.friend/6] when FRIEND is an ordinary member function
947 of a template class, we want to check if DECL is a specialization
949 if (TREE_CODE (friend) == FUNCTION_DECL
950 && DECL_TEMPLATE_INFO (friend)
951 && !DECL_USE_TEMPLATE (friend))
953 /* We want a TEMPLATE_DECL for `is_specialization_of'. */
954 friend = DECL_TI_TEMPLATE (friend);
955 need_template = false;
957 else if (TREE_CODE (friend) == TEMPLATE_DECL
958 && !PRIMARY_TEMPLATE_P (friend))
959 need_template = false;
961 /* There is nothing to do if this is not a template friend. */
962 if (TREE_CODE (friend) != TEMPLATE_DECL)
965 if (is_specialization_of (decl, friend))
969 A member of a class template may be declared to be a friend of a
970 non-template class. In this case, the corresponding member of
971 every specialization of the class template is a friend of the
972 class granting friendship.
974 For example, given a template friend declaration
976 template <class T> friend void A<T>::f();
978 the member function below is considered a friend
980 template <> struct A<int> {
984 For this type of template friend, TEMPLATE_DEPTH below will be
985 nonzero. To determine if DECL is a friend of FRIEND, we first
986 check if the enclosing class is a specialization of another. */
988 template_depth = template_class_depth (DECL_CONTEXT (friend));
990 && DECL_CLASS_SCOPE_P (decl)
991 && is_specialization_of (TYPE_NAME (DECL_CONTEXT (decl)),
992 CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (friend))))
994 /* Next, we check the members themselves. In order to handle
995 a few tricky cases, such as when FRIEND's are
997 template <class T> friend void A<T>::g(T t);
998 template <class T> template <T t> friend void A<T>::h();
1002 void A<int>::g(int);
1003 template <int> void A<int>::h();
1005 we need to figure out ARGS, the template arguments from
1006 the context of DECL. This is required for template substitution
1007 of `T' in the function parameter of `g' and template parameter
1008 of `h' in the above examples. Here ARGS corresponds to `int'. */
1010 tree context = DECL_CONTEXT (decl);
1011 tree args = NULL_TREE;
1012 int current_depth = 0;
1014 while (current_depth < template_depth)
1016 if (CLASSTYPE_TEMPLATE_INFO (context))
1018 if (current_depth == 0)
1019 args = TYPE_TI_ARGS (context);
1021 args = add_to_template_args (TYPE_TI_ARGS (context), args);
1024 context = TYPE_CONTEXT (context);
1027 if (TREE_CODE (decl) == FUNCTION_DECL)
1032 tree friend_args_type;
1033 tree decl_args_type;
1035 /* Make sure that both DECL and FRIEND are templates or
1037 is_template = DECL_TEMPLATE_INFO (decl)
1038 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl));
1039 if (need_template ^ is_template)
1041 else if (is_template)
1043 /* If both are templates, check template parameter list. */
1045 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend),
1047 if (!comp_template_parms
1048 (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (decl)),
1052 decl_type = TREE_TYPE (DECL_TI_TEMPLATE (decl));
1055 decl_type = TREE_TYPE (decl);
1057 friend_type = tsubst_function_type (TREE_TYPE (friend), args,
1058 tf_none, NULL_TREE);
1059 if (friend_type == error_mark_node)
1062 /* Check if return types match. */
1063 if (!same_type_p (TREE_TYPE (decl_type), TREE_TYPE (friend_type)))
1066 /* Check if function parameter types match, ignoring the
1067 `this' parameter. */
1068 friend_args_type = TYPE_ARG_TYPES (friend_type);
1069 decl_args_type = TYPE_ARG_TYPES (decl_type);
1070 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (friend))
1071 friend_args_type = TREE_CHAIN (friend_args_type);
1072 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1073 decl_args_type = TREE_CHAIN (decl_args_type);
1075 return compparms (decl_args_type, friend_args_type);
1079 /* DECL is a TYPE_DECL */
1081 tree decl_type = TREE_TYPE (decl);
1083 /* Make sure that both DECL and FRIEND are templates or
1086 = CLASSTYPE_TEMPLATE_INFO (decl_type)
1087 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (decl_type));
1089 if (need_template ^ is_template)
1091 else if (is_template)
1094 /* If both are templates, check the name of the two
1095 TEMPLATE_DECL's first because is_friend didn't. */
1096 if (DECL_NAME (CLASSTYPE_TI_TEMPLATE (decl_type))
1097 != DECL_NAME (friend))
1100 /* Now check template parameter list. */
1102 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend),
1104 return comp_template_parms
1105 (DECL_TEMPLATE_PARMS (CLASSTYPE_TI_TEMPLATE (decl_type)),
1109 return (DECL_NAME (decl)
1110 == DECL_NAME (friend));
1116 /* Register the specialization SPEC as a specialization of TMPL with
1117 the indicated ARGS. Returns SPEC, or an equivalent prior
1118 declaration, if available. */
1121 register_specialization (tree spec, tree tmpl, tree args)
1125 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
1127 if (TREE_CODE (spec) == FUNCTION_DECL
1128 && uses_template_parms (DECL_TI_ARGS (spec)))
1129 /* This is the FUNCTION_DECL for a partial instantiation. Don't
1130 register it; we want the corresponding TEMPLATE_DECL instead.
1131 We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than
1132 the more obvious `uses_template_parms (spec)' to avoid problems
1133 with default function arguments. In particular, given
1134 something like this:
1136 template <class T> void f(T t1, T t = T())
1138 the default argument expression is not substituted for in an
1139 instantiation unless and until it is actually needed. */
1142 /* There should be as many levels of arguments as there are
1143 levels of parameters. */
1144 gcc_assert (TMPL_ARGS_DEPTH (args)
1145 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)));
1147 fn = retrieve_specialization (tmpl, args,
1148 /*class_specializations_p=*/false);
1149 /* We can sometimes try to re-register a specialization that we've
1150 already got. In particular, regenerate_decl_from_template calls
1151 duplicate_decls which will update the specialization list. But,
1152 we'll still get called again here anyhow. It's more convenient
1153 to simply allow this than to try to prevent it. */
1156 else if (fn && DECL_TEMPLATE_SPECIALIZATION (spec))
1158 if (DECL_TEMPLATE_INSTANTIATION (fn))
1161 || DECL_EXPLICIT_INSTANTIATION (fn))
1163 error ("specialization of %qD after instantiation",
1169 /* This situation should occur only if the first
1170 specialization is an implicit instantiation, the
1171 second is an explicit specialization, and the
1172 implicit instantiation has not yet been used. That
1173 situation can occur if we have implicitly
1174 instantiated a member function and then specialized
1177 We can also wind up here if a friend declaration that
1178 looked like an instantiation turns out to be a
1181 template <class T> void foo(T);
1182 class S { friend void foo<>(int) };
1183 template <> void foo(int);
1185 We transform the existing DECL in place so that any
1186 pointers to it become pointers to the updated
1189 If there was a definition for the template, but not
1190 for the specialization, we want this to look as if
1191 there were no definition, and vice versa. */
1192 DECL_INITIAL (fn) = NULL_TREE;
1193 duplicate_decls (spec, fn);
1198 else if (DECL_TEMPLATE_SPECIALIZATION (fn))
1200 if (!duplicate_decls (spec, fn) && DECL_INITIAL (spec))
1201 /* Dup decl failed, but this is a new definition. Set the
1202 line number so any errors match this new
1204 DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (spec);
1210 /* A specialization must be declared in the same namespace as the
1211 template it is specializing. */
1212 if (DECL_TEMPLATE_SPECIALIZATION (spec)
1213 && !check_specialization_namespace (tmpl))
1214 DECL_CONTEXT (spec) = decl_namespace_context (tmpl);
1216 if (!optimize_specialization_lookup_p (tmpl))
1217 DECL_TEMPLATE_SPECIALIZATIONS (tmpl)
1218 = tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl));
1223 /* Unregister the specialization SPEC as a specialization of TMPL.
1224 Replace it with NEW_SPEC, if NEW_SPEC is non-NULL. Returns true
1225 if the SPEC was listed as a specialization of TMPL. */
1228 reregister_specialization (tree spec, tree tmpl, tree new_spec)
1232 for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
1234 s = &TREE_CHAIN (*s))
1235 if (TREE_VALUE (*s) == spec)
1238 *s = TREE_CHAIN (*s);
1240 TREE_VALUE (*s) = new_spec;
1247 /* Compare an entry in the local specializations hash table P1 (which
1248 is really a pointer to a TREE_LIST) with P2 (which is really a
1252 eq_local_specializations (const void *p1, const void *p2)
1254 return TREE_VALUE ((tree) p1) == (tree) p2;
1257 /* Hash P1, an entry in the local specializations table. */
1260 hash_local_specialization (const void* p1)
1262 return htab_hash_pointer (TREE_VALUE ((tree) p1));
1265 /* Like register_specialization, but for local declarations. We are
1266 registering SPEC, an instantiation of TMPL. */
1269 register_local_specialization (tree spec, tree tmpl)
1273 slot = htab_find_slot_with_hash (local_specializations, tmpl,
1274 htab_hash_pointer (tmpl), INSERT);
1275 *slot = build_tree_list (spec, tmpl);
1278 /* Print the list of candidate FNS in an error message. */
1281 print_candidates (tree fns)
1285 const char *str = "candidates are:";
1287 for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn))
1291 for (f = TREE_VALUE (fn); f; f = OVL_NEXT (f))
1292 cp_error_at ("%s %+#D", str, OVL_CURRENT (f));
1297 /* Returns the template (one of the functions given by TEMPLATE_ID)
1298 which can be specialized to match the indicated DECL with the
1299 explicit template args given in TEMPLATE_ID. The DECL may be
1300 NULL_TREE if none is available. In that case, the functions in
1301 TEMPLATE_ID are non-members.
1303 If NEED_MEMBER_TEMPLATE is nonzero the function is known to be a
1304 specialization of a member template.
1306 The TEMPLATE_COUNT is the number of references to qualifying
1307 template classes that appeared in the name of the function. See
1308 check_explicit_specialization for a more accurate description.
1310 The template args (those explicitly specified and those deduced)
1311 are output in a newly created vector *TARGS_OUT.
1313 If it is impossible to determine the result, an error message is
1314 issued. The error_mark_node is returned to indicate failure. */
1317 determine_specialization (tree template_id,
1320 int need_member_template,
1325 tree explicit_targs;
1326 tree candidates = NULL_TREE;
1327 tree templates = NULL_TREE;
1329 struct cp_binding_level *b;
1331 *targs_out = NULL_TREE;
1333 if (template_id == error_mark_node)
1334 return error_mark_node;
1336 fns = TREE_OPERAND (template_id, 0);
1337 explicit_targs = TREE_OPERAND (template_id, 1);
1339 if (fns == error_mark_node)
1340 return error_mark_node;
1342 /* Check for baselinks. */
1343 if (BASELINK_P (fns))
1344 fns = BASELINK_FUNCTIONS (fns);
1346 if (!is_overloaded_fn (fns))
1348 error ("%qD is not a function template", fns);
1349 return error_mark_node;
1352 /* Count the number of template headers specified for this
1355 for (b = current_binding_level;
1356 b->kind == sk_template_parms;
1360 for (; fns; fns = OVL_NEXT (fns))
1362 tree fn = OVL_CURRENT (fns);
1364 if (TREE_CODE (fn) == TEMPLATE_DECL)
1366 tree decl_arg_types;
1369 /* DECL might be a specialization of FN. */
1371 /* Adjust the type of DECL in case FN is a static member. */
1372 decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
1373 if (DECL_STATIC_FUNCTION_P (fn)
1374 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1375 decl_arg_types = TREE_CHAIN (decl_arg_types);
1377 /* Check that the number of function parameters matches.
1379 template <class T> void f(int i = 0);
1380 template <> void f<int>();
1381 The specialization f<int> is invalid but is not caught
1382 by get_bindings below. */
1384 fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
1385 if (list_length (fn_arg_types) != list_length (decl_arg_types))
1388 /* For a non-static member function, we need to make sure that
1389 the const qualification is the same. This can be done by
1390 checking the 'this' in the argument list. */
1391 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
1392 && !same_type_p (TREE_VALUE (fn_arg_types),
1393 TREE_VALUE (decl_arg_types)))
1396 /* In case of explicit specialization, we need to check if
1397 the number of template headers appearing in the specialization
1398 is correct. This is usually done in check_explicit_specialization,
1399 but the check done there cannot be exhaustive when specializing
1400 member functions. Consider the following code:
1402 template <> void A<int>::f(int);
1403 template <> template <> void A<int>::f(int);
1405 Assuming that A<int> is not itself an explicit specialization
1406 already, the first line specializes "f" which is a non-template
1407 member function, whilst the second line specializes "f" which
1408 is a template member function. So both lines are syntactically
1409 correct, and check_explicit_specialization does not reject
1412 Here, we can do better, as we are matching the specialization
1413 against the declarations. We count the number of template
1414 headers, and we check if they match TEMPLATE_COUNT + 1
1415 (TEMPLATE_COUNT is the number of qualifying template classes,
1416 plus there must be another header for the member template
1419 Notice that if header_count is zero, this is not a
1420 specialization but rather a template instantiation, so there
1421 is no check we can perform here. */
1422 if (header_count && header_count != template_count + 1)
1425 /* Check that the number of template arguments at the
1426 innermost level for DECL is the same as for FN. */
1427 if (current_binding_level->kind == sk_template_parms
1428 && !current_binding_level->explicit_spec_p
1429 && (TREE_VEC_LENGTH (DECL_INNERMOST_TEMPLATE_PARMS (fn))
1430 != TREE_VEC_LENGTH (TREE_VALUE (current_template_parms))))
1433 /* See whether this function might be a specialization of this
1435 targs = get_bindings (fn, decl, explicit_targs, /*check_ret=*/true);
1438 /* We cannot deduce template arguments that when used to
1439 specialize TMPL will produce DECL. */
1442 /* Save this template, and the arguments deduced. */
1443 templates = tree_cons (targs, fn, templates);
1445 else if (need_member_template)
1446 /* FN is an ordinary member function, and we need a
1447 specialization of a member template. */
1449 else if (TREE_CODE (fn) != FUNCTION_DECL)
1450 /* We can get IDENTIFIER_NODEs here in certain erroneous
1453 else if (!DECL_FUNCTION_MEMBER_P (fn))
1454 /* This is just an ordinary non-member function. Nothing can
1455 be a specialization of that. */
1457 else if (DECL_ARTIFICIAL (fn))
1458 /* Cannot specialize functions that are created implicitly. */
1462 tree decl_arg_types;
1464 /* This is an ordinary member function. However, since
1465 we're here, we can assume it's enclosing class is a
1466 template class. For example,
1468 template <typename T> struct S { void f(); };
1469 template <> void S<int>::f() {}
1471 Here, S<int>::f is a non-template, but S<int> is a
1472 template class. If FN has the same type as DECL, we
1473 might be in business. */
1475 if (!DECL_TEMPLATE_INFO (fn))
1476 /* Its enclosing class is an explicit specialization
1477 of a template class. This is not a candidate. */
1480 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
1481 TREE_TYPE (TREE_TYPE (fn))))
1482 /* The return types differ. */
1485 /* Adjust the type of DECL in case FN is a static member. */
1486 decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
1487 if (DECL_STATIC_FUNCTION_P (fn)
1488 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1489 decl_arg_types = TREE_CHAIN (decl_arg_types);
1491 if (compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)),
1494 candidates = tree_cons (NULL_TREE, fn, candidates);
1498 if (templates && TREE_CHAIN (templates))
1504 It is possible for a specialization with a given function
1505 signature to be instantiated from more than one function
1506 template. In such cases, explicit specification of the
1507 template arguments must be used to uniquely identify the
1508 function template specialization being specialized.
1510 Note that here, there's no suggestion that we're supposed to
1511 determine which of the candidate templates is most
1512 specialized. However, we, also have:
1516 Partial ordering of overloaded function template
1517 declarations is used in the following contexts to select
1518 the function template to which a function template
1519 specialization refers:
1521 -- when an explicit specialization refers to a function
1524 So, we do use the partial ordering rules, at least for now.
1525 This extension can only serve to make invalid programs valid,
1526 so it's safe. And, there is strong anecdotal evidence that
1527 the committee intended the partial ordering rules to apply;
1528 the EDG front-end has that behavior, and John Spicer claims
1529 that the committee simply forgot to delete the wording in
1530 [temp.expl.spec]. */
1531 tree tmpl = most_specialized (templates, decl, explicit_targs);
1532 if (tmpl && tmpl != error_mark_node)
1534 targs = get_bindings (tmpl, decl, explicit_targs, /*check_ret=*/true);
1535 templates = tree_cons (targs, tmpl, NULL_TREE);
1539 if (templates == NULL_TREE && candidates == NULL_TREE)
1541 cp_error_at ("template-id %qD for %q+D does not match any template "
1544 return error_mark_node;
1546 else if ((templates && TREE_CHAIN (templates))
1547 || (candidates && TREE_CHAIN (candidates))
1548 || (templates && candidates))
1550 cp_error_at ("ambiguous template specialization %qD for %q+D",
1552 chainon (candidates, templates);
1553 print_candidates (candidates);
1554 return error_mark_node;
1557 /* We have one, and exactly one, match. */
1560 /* It was a specialization of an ordinary member function in a
1562 *targs_out = copy_node (DECL_TI_ARGS (TREE_VALUE (candidates)));
1563 return DECL_TI_TEMPLATE (TREE_VALUE (candidates));
1566 /* It was a specialization of a template. */
1567 targs = DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates)));
1568 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs))
1570 *targs_out = copy_node (targs);
1571 SET_TMPL_ARGS_LEVEL (*targs_out,
1572 TMPL_ARGS_DEPTH (*targs_out),
1573 TREE_PURPOSE (templates));
1576 *targs_out = TREE_PURPOSE (templates);
1577 return TREE_VALUE (templates);
1580 /* Returns a chain of parameter types, exactly like the SPEC_TYPES,
1581 but with the default argument values filled in from those in the
1585 copy_default_args_to_explicit_spec_1 (tree spec_types,
1588 tree new_spec_types;
1593 if (spec_types == void_list_node)
1594 return void_list_node;
1596 /* Substitute into the rest of the list. */
1598 copy_default_args_to_explicit_spec_1 (TREE_CHAIN (spec_types),
1599 TREE_CHAIN (tmpl_types));
1601 /* Add the default argument for this parameter. */
1602 return hash_tree_cons (TREE_PURPOSE (tmpl_types),
1603 TREE_VALUE (spec_types),
1607 /* DECL is an explicit specialization. Replicate default arguments
1608 from the template it specializes. (That way, code like:
1610 template <class T> void f(T = 3);
1611 template <> void f(double);
1614 works, as required.) An alternative approach would be to look up
1615 the correct default arguments at the call-site, but this approach
1616 is consistent with how implicit instantiations are handled. */
1619 copy_default_args_to_explicit_spec (tree decl)
1624 tree new_spec_types;
1628 tree object_type = NULL_TREE;
1629 tree in_charge = NULL_TREE;
1630 tree vtt = NULL_TREE;
1632 /* See if there's anything we need to do. */
1633 tmpl = DECL_TI_TEMPLATE (decl);
1634 tmpl_types = TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl)));
1635 for (t = tmpl_types; t; t = TREE_CHAIN (t))
1636 if (TREE_PURPOSE (t))
1641 old_type = TREE_TYPE (decl);
1642 spec_types = TYPE_ARG_TYPES (old_type);
1644 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1646 /* Remove the this pointer, but remember the object's type for
1648 object_type = TREE_TYPE (TREE_VALUE (spec_types));
1649 spec_types = TREE_CHAIN (spec_types);
1650 tmpl_types = TREE_CHAIN (tmpl_types);
1652 if (DECL_HAS_IN_CHARGE_PARM_P (decl))
1654 /* DECL may contain more parameters than TMPL due to the extra
1655 in-charge parameter in constructors and destructors. */
1656 in_charge = spec_types;
1657 spec_types = TREE_CHAIN (spec_types);
1659 if (DECL_HAS_VTT_PARM_P (decl))
1662 spec_types = TREE_CHAIN (spec_types);
1666 /* Compute the merged default arguments. */
1668 copy_default_args_to_explicit_spec_1 (spec_types, tmpl_types);
1670 /* Compute the new FUNCTION_TYPE. */
1674 new_spec_types = hash_tree_cons (TREE_PURPOSE (vtt),
1679 /* Put the in-charge parameter back. */
1680 new_spec_types = hash_tree_cons (TREE_PURPOSE (in_charge),
1681 TREE_VALUE (in_charge),
1684 new_type = build_method_type_directly (object_type,
1685 TREE_TYPE (old_type),
1689 new_type = build_function_type (TREE_TYPE (old_type),
1691 new_type = cp_build_type_attribute_variant (new_type,
1692 TYPE_ATTRIBUTES (old_type));
1693 new_type = build_exception_variant (new_type,
1694 TYPE_RAISES_EXCEPTIONS (old_type));
1695 TREE_TYPE (decl) = new_type;
1698 /* Check to see if the function just declared, as indicated in
1699 DECLARATOR, and in DECL, is a specialization of a function
1700 template. We may also discover that the declaration is an explicit
1701 instantiation at this point.
1703 Returns DECL, or an equivalent declaration that should be used
1704 instead if all goes well. Issues an error message if something is
1705 amiss. Returns error_mark_node if the error is not easily
1708 FLAGS is a bitmask consisting of the following flags:
1710 2: The function has a definition.
1711 4: The function is a friend.
1713 The TEMPLATE_COUNT is the number of references to qualifying
1714 template classes that appeared in the name of the function. For
1717 template <class T> struct S { void f(); };
1720 the TEMPLATE_COUNT would be 1. However, explicitly specialized
1721 classes are not counted in the TEMPLATE_COUNT, so that in
1723 template <class T> struct S {};
1724 template <> struct S<int> { void f(); }
1725 template <> void S<int>::f();
1727 the TEMPLATE_COUNT would be 0. (Note that this declaration is
1728 invalid; there should be no template <>.)
1730 If the function is a specialization, it is marked as such via
1731 DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO
1732 is set up correctly, and it is added to the list of specializations
1733 for that template. */
1736 check_explicit_specialization (tree declarator,
1741 int have_def = flags & 2;
1742 int is_friend = flags & 4;
1743 int specialization = 0;
1744 int explicit_instantiation = 0;
1745 int member_specialization = 0;
1746 tree ctype = DECL_CLASS_CONTEXT (decl);
1747 tree dname = DECL_NAME (decl);
1752 if (!processing_specialization)
1755 tsk = tsk_excessive_parms;
1758 tsk = current_tmpl_spec_kind (template_count);
1763 if (processing_specialization)
1766 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
1768 else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
1771 /* This could be something like:
1773 template <class T> void f(T);
1774 class S { friend void f<>(int); } */
1778 /* This case handles bogus declarations like template <>
1779 template <class T> void f<int>(); */
1781 error ("template-id %qD in declaration of primary template",
1788 case tsk_invalid_member_spec:
1789 /* The error has already been reported in
1790 check_specialization_scope. */
1791 return error_mark_node;
1793 case tsk_invalid_expl_inst:
1794 error ("template parameter list used in explicit instantiation");
1800 error ("definition provided for explicit instantiation");
1802 explicit_instantiation = 1;
1805 case tsk_excessive_parms:
1806 case tsk_insufficient_parms:
1807 if (tsk == tsk_excessive_parms)
1808 error ("too many template parameter lists in declaration of %qD",
1810 else if (template_header_count)
1811 error("too few template parameter lists in declaration of %qD", decl);
1813 error("explicit specialization of %qD must be introduced by "
1814 "%<template <>%>", decl);
1818 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
1820 member_specialization = 1;
1826 if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
1828 /* This case handles bogus declarations like template <>
1829 template <class T> void f<int>(); */
1831 if (uses_template_parms (declarator))
1832 error ("function template partial specialization %qD "
1833 "is not allowed", declarator);
1835 error ("template-id %qD in declaration of primary template",
1840 if (ctype && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype))
1841 /* This is a specialization of a member template, without
1842 specialization the containing class. Something like:
1844 template <class T> struct S {
1845 template <class U> void f (U);
1847 template <> template <class U> void S<int>::f(U) {}
1849 That's a specialization -- but of the entire template. */
1857 if (specialization || member_specialization)
1859 tree t = TYPE_ARG_TYPES (TREE_TYPE (decl));
1860 for (; t; t = TREE_CHAIN (t))
1861 if (TREE_PURPOSE (t))
1864 ("default argument specified in explicit specialization");
1867 if (current_lang_name == lang_name_c)
1868 error ("template specialization with C linkage");
1871 if (specialization || member_specialization || explicit_instantiation)
1873 tree tmpl = NULL_TREE;
1874 tree targs = NULL_TREE;
1876 /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */
1877 if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR)
1881 gcc_assert (TREE_CODE (declarator) == IDENTIFIER_NODE);
1886 /* If there is no class context, the explicit instantiation
1887 must be at namespace scope. */
1888 gcc_assert (DECL_NAMESPACE_SCOPE_P (decl));
1890 /* Find the namespace binding, using the declaration
1892 fns = namespace_binding (dname, CP_DECL_CONTEXT (decl));
1893 if (!fns || !is_overloaded_fn (fns))
1895 error ("%qD is not a template function", dname);
1896 fns = error_mark_node;
1900 declarator = lookup_template_function (fns, NULL_TREE);
1903 if (declarator == error_mark_node)
1904 return error_mark_node;
1906 if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype))
1908 if (!explicit_instantiation)
1909 /* A specialization in class scope. This is invalid,
1910 but the error will already have been flagged by
1911 check_specialization_scope. */
1912 return error_mark_node;
1915 /* It's not valid to write an explicit instantiation in
1918 class C { template void f(); }
1920 This case is caught by the parser. However, on
1923 template class C { void f(); };
1925 (which is invalid) we can get here. The error will be
1932 else if (ctype != NULL_TREE
1933 && (TREE_CODE (TREE_OPERAND (declarator, 0)) ==
1936 /* Find the list of functions in ctype that have the same
1937 name as the declared function. */
1938 tree name = TREE_OPERAND (declarator, 0);
1939 tree fns = NULL_TREE;
1942 if (constructor_name_p (name, ctype))
1944 int is_constructor = DECL_CONSTRUCTOR_P (decl);
1946 if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype)
1947 : !CLASSTYPE_DESTRUCTORS (ctype))
1949 /* From [temp.expl.spec]:
1951 If such an explicit specialization for the member
1952 of a class template names an implicitly-declared
1953 special member function (clause _special_), the
1954 program is ill-formed.
1956 Similar language is found in [temp.explicit]. */
1957 error ("specialization of implicitly-declared special member function");
1958 return error_mark_node;
1961 name = is_constructor ? ctor_identifier : dtor_identifier;
1964 if (!DECL_CONV_FN_P (decl))
1966 idx = lookup_fnfields_1 (ctype, name);
1968 fns = VEC_index (tree, CLASSTYPE_METHOD_VEC (ctype), idx);
1972 VEC(tree,gc) *methods;
1975 /* For a type-conversion operator, we cannot do a
1976 name-based lookup. We might be looking for `operator
1977 int' which will be a specialization of `operator T'.
1978 So, we find *all* the conversion operators, and then
1979 select from them. */
1982 methods = CLASSTYPE_METHOD_VEC (ctype);
1984 for (idx = CLASSTYPE_FIRST_CONVERSION_SLOT;
1985 VEC_iterate (tree, methods, idx, ovl);
1988 if (!DECL_CONV_FN_P (OVL_CURRENT (ovl)))
1989 /* There are no more conversion functions. */
1992 /* Glue all these conversion functions together
1993 with those we already have. */
1994 for (; ovl; ovl = OVL_NEXT (ovl))
1995 fns = ovl_cons (OVL_CURRENT (ovl), fns);
1999 if (fns == NULL_TREE)
2001 error ("no member function %qD declared in %qT", name, ctype);
2002 return error_mark_node;
2005 TREE_OPERAND (declarator, 0) = fns;
2008 /* Figure out what exactly is being specialized at this point.
2009 Note that for an explicit instantiation, even one for a
2010 member function, we cannot tell apriori whether the
2011 instantiation is for a member template, or just a member
2012 function of a template class. Even if a member template is
2013 being instantiated, the member template arguments may be
2014 elided if they can be deduced from the rest of the
2016 tmpl = determine_specialization (declarator, decl,
2018 member_specialization,
2021 if (!tmpl || tmpl == error_mark_node)
2022 /* We couldn't figure out what this declaration was
2024 return error_mark_node;
2027 tree gen_tmpl = most_general_template (tmpl);
2029 if (explicit_instantiation)
2031 /* We don't set DECL_EXPLICIT_INSTANTIATION here; that
2032 is done by do_decl_instantiation later. */
2034 int arg_depth = TMPL_ARGS_DEPTH (targs);
2035 int parm_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl));
2037 if (arg_depth > parm_depth)
2039 /* If TMPL is not the most general template (for
2040 example, if TMPL is a friend template that is
2041 injected into namespace scope), then there will
2042 be too many levels of TARGS. Remove some of them
2047 new_targs = make_tree_vec (parm_depth);
2048 for (i = arg_depth - parm_depth; i < arg_depth; ++i)
2049 TREE_VEC_ELT (new_targs, i - (arg_depth - parm_depth))
2050 = TREE_VEC_ELT (targs, i);
2054 return instantiate_template (tmpl, targs, tf_error);
2057 /* If we thought that the DECL was a member function, but it
2058 turns out to be specializing a static member function,
2059 make DECL a static member function as well. */
2060 if (DECL_STATIC_FUNCTION_P (tmpl)
2061 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
2062 revert_static_member_fn (decl);
2064 /* If this is a specialization of a member template of a
2065 template class. In we want to return the TEMPLATE_DECL,
2066 not the specialization of it. */
2067 if (tsk == tsk_template)
2069 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl);
2070 DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl)) = NULL_TREE;
2073 DECL_SOURCE_LOCATION (tmpl) = DECL_SOURCE_LOCATION (decl);
2074 DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (tmpl))
2075 = DECL_SOURCE_LOCATION (decl);
2076 /* We want to use the argument list specified in the
2077 definition, not in the original declaration. */
2078 DECL_ARGUMENTS (DECL_TEMPLATE_RESULT (tmpl))
2079 = DECL_ARGUMENTS (decl);
2084 /* Set up the DECL_TEMPLATE_INFO for DECL. */
2085 DECL_TEMPLATE_INFO (decl) = tree_cons (tmpl, targs, NULL_TREE);
2087 /* Inherit default function arguments from the template
2088 DECL is specializing. */
2089 copy_default_args_to_explicit_spec (decl);
2091 /* This specialization has the same protection as the
2092 template it specializes. */
2093 TREE_PRIVATE (decl) = TREE_PRIVATE (gen_tmpl);
2094 TREE_PROTECTED (decl) = TREE_PROTECTED (gen_tmpl);
2096 if (is_friend && !have_def)
2097 /* This is not really a declaration of a specialization.
2098 It's just the name of an instantiation. But, it's not
2099 a request for an instantiation, either. */
2100 SET_DECL_IMPLICIT_INSTANTIATION (decl);
2101 else if (DECL_CONSTRUCTOR_P (decl) || DECL_DESTRUCTOR_P (decl))
2102 /* This is indeed a specialization. In case of constructors
2103 and destructors, we need in-charge and not-in-charge
2104 versions in V3 ABI. */
2105 clone_function_decl (decl, /*update_method_vec_p=*/0);
2107 /* Register this specialization so that we can find it
2109 decl = register_specialization (decl, gen_tmpl, targs);
2116 /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template
2117 parameters. These are represented in the same format used for
2118 DECL_TEMPLATE_PARMS. */
2121 comp_template_parms (tree parms1, tree parms2)
2126 if (parms1 == parms2)
2129 for (p1 = parms1, p2 = parms2;
2130 p1 != NULL_TREE && p2 != NULL_TREE;
2131 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2))
2133 tree t1 = TREE_VALUE (p1);
2134 tree t2 = TREE_VALUE (p2);
2137 gcc_assert (TREE_CODE (t1) == TREE_VEC);
2138 gcc_assert (TREE_CODE (t2) == TREE_VEC);
2140 if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2))
2143 for (i = 0; i < TREE_VEC_LENGTH (t2); ++i)
2145 tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i));
2146 tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i));
2148 if (TREE_CODE (parm1) != TREE_CODE (parm2))
2151 if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM)
2153 else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2)))
2158 if ((p1 != NULL_TREE) != (p2 != NULL_TREE))
2159 /* One set of parameters has more parameters lists than the
2166 /* Complain if DECL shadows a template parameter.
2168 [temp.local]: A template-parameter shall not be redeclared within its
2169 scope (including nested scopes). */
2172 check_template_shadow (tree decl)
2176 /* If we're not in a template, we can't possibly shadow a template
2178 if (!current_template_parms)
2181 /* Figure out what we're shadowing. */
2182 if (TREE_CODE (decl) == OVERLOAD)
2183 decl = OVL_CURRENT (decl);
2184 olddecl = innermost_non_namespace_value (DECL_NAME (decl));
2186 /* If there's no previous binding for this name, we're not shadowing
2187 anything, let alone a template parameter. */
2191 /* If we're not shadowing a template parameter, we're done. Note
2192 that OLDDECL might be an OVERLOAD (or perhaps even an
2193 ERROR_MARK), so we can't just blithely assume it to be a _DECL
2195 if (!DECL_P (olddecl) || !DECL_TEMPLATE_PARM_P (olddecl))
2198 /* We check for decl != olddecl to avoid bogus errors for using a
2199 name inside a class. We check TPFI to avoid duplicate errors for
2200 inline member templates. */
2202 || TEMPLATE_PARMS_FOR_INLINE (current_template_parms))
2205 cp_error_at ("declaration of %q#D", decl);
2206 cp_error_at (" shadows template parm %q#D", olddecl);
2209 /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL,
2210 ORIG_LEVEL, DECL, and TYPE. */
2213 build_template_parm_index (int index,
2219 tree t = make_node (TEMPLATE_PARM_INDEX);
2220 TEMPLATE_PARM_IDX (t) = index;
2221 TEMPLATE_PARM_LEVEL (t) = level;
2222 TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level;
2223 TEMPLATE_PARM_DECL (t) = decl;
2224 TREE_TYPE (t) = type;
2225 TREE_CONSTANT (t) = TREE_CONSTANT (decl);
2226 TREE_INVARIANT (t) = TREE_INVARIANT (decl);
2227 TREE_READONLY (t) = TREE_READONLY (decl);
2232 /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose
2233 TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a
2234 TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a
2235 new one is created. */
2238 reduce_template_parm_level (tree index, tree type, int levels)
2240 if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE
2241 || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index))
2242 != TEMPLATE_PARM_LEVEL (index) - levels))
2244 tree orig_decl = TEMPLATE_PARM_DECL (index);
2247 decl = build_decl (TREE_CODE (orig_decl), DECL_NAME (orig_decl), type);
2248 TREE_CONSTANT (decl) = TREE_CONSTANT (orig_decl);
2249 TREE_INVARIANT (decl) = TREE_INVARIANT (orig_decl);
2250 TREE_READONLY (decl) = TREE_READONLY (orig_decl);
2251 DECL_ARTIFICIAL (decl) = 1;
2252 SET_DECL_TEMPLATE_PARM_P (decl);
2254 t = build_template_parm_index (TEMPLATE_PARM_IDX (index),
2255 TEMPLATE_PARM_LEVEL (index) - levels,
2256 TEMPLATE_PARM_ORIG_LEVEL (index),
2258 TEMPLATE_PARM_DESCENDANTS (index) = t;
2260 /* Template template parameters need this. */
2261 DECL_TEMPLATE_PARMS (decl)
2262 = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index));
2265 return TEMPLATE_PARM_DESCENDANTS (index);
2268 /* Process information from new template parameter NEXT and append it to the
2269 LIST being built. This new parameter is a non-type parameter iff
2270 IS_NON_TYPE is true. */
2273 process_template_parm (tree list, tree next, bool is_non_type)
2281 gcc_assert (TREE_CODE (parm) == TREE_LIST);
2282 defval = TREE_PURPOSE (parm);
2286 tree p = TREE_VALUE (tree_last (list));
2288 if (TREE_CODE (p) == TYPE_DECL || TREE_CODE (p) == TEMPLATE_DECL)
2289 idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p));
2291 idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p));
2299 parm = TREE_VALUE (parm);
2301 SET_DECL_TEMPLATE_PARM_P (parm);
2305 The top-level cv-qualifiers on the template-parameter are
2306 ignored when determining its type. */
2307 TREE_TYPE (parm) = TYPE_MAIN_VARIANT (TREE_TYPE (parm));
2309 /* A template parameter is not modifiable. */
2310 TREE_CONSTANT (parm) = 1;
2311 TREE_INVARIANT (parm) = 1;
2312 TREE_READONLY (parm) = 1;
2313 if (invalid_nontype_parm_type_p (TREE_TYPE (parm), 1))
2314 TREE_TYPE (parm) = void_type_node;
2315 decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm));
2316 TREE_CONSTANT (decl) = 1;
2317 TREE_INVARIANT (decl) = 1;
2318 TREE_READONLY (decl) = 1;
2319 DECL_INITIAL (parm) = DECL_INITIAL (decl)
2320 = build_template_parm_index (idx, processing_template_decl,
2321 processing_template_decl,
2322 decl, TREE_TYPE (parm));
2327 parm = TREE_VALUE (TREE_VALUE (parm));
2329 if (parm && TREE_CODE (parm) == TEMPLATE_DECL)
2331 t = make_aggr_type (TEMPLATE_TEMPLATE_PARM);
2332 /* This is for distinguishing between real templates and template
2333 template parameters */
2334 TREE_TYPE (parm) = t;
2335 TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t;
2340 t = make_aggr_type (TEMPLATE_TYPE_PARM);
2341 /* parm is either IDENTIFIER_NODE or NULL_TREE. */
2342 decl = build_decl (TYPE_DECL, parm, t);
2345 TYPE_NAME (t) = decl;
2346 TYPE_STUB_DECL (t) = decl;
2348 TEMPLATE_TYPE_PARM_INDEX (t)
2349 = build_template_parm_index (idx, processing_template_decl,
2350 processing_template_decl,
2351 decl, TREE_TYPE (parm));
2353 DECL_ARTIFICIAL (decl) = 1;
2354 SET_DECL_TEMPLATE_PARM_P (decl);
2356 parm = build_tree_list (defval, parm);
2357 return chainon (list, parm);
2360 /* The end of a template parameter list has been reached. Process the
2361 tree list into a parameter vector, converting each parameter into a more
2362 useful form. Type parameters are saved as IDENTIFIER_NODEs, and others
2366 end_template_parm_list (tree parms)
2370 tree saved_parmlist = make_tree_vec (list_length (parms));
2372 current_template_parms
2373 = tree_cons (size_int (processing_template_decl),
2374 saved_parmlist, current_template_parms);
2376 for (parm = parms, nparms = 0; parm; parm = next, nparms++)
2378 next = TREE_CHAIN (parm);
2379 TREE_VEC_ELT (saved_parmlist, nparms) = parm;
2380 TREE_CHAIN (parm) = NULL_TREE;
2383 --processing_template_parmlist;
2385 return saved_parmlist;
2388 /* end_template_decl is called after a template declaration is seen. */
2391 end_template_decl (void)
2393 reset_specialization ();
2395 if (! processing_template_decl)
2398 /* This matches the pushlevel in begin_template_parm_list. */
2401 --processing_template_decl;
2402 current_template_parms = TREE_CHAIN (current_template_parms);
2405 /* Given a template argument vector containing the template PARMS.
2406 The innermost PARMS are given first. */
2409 current_template_args (void)
2412 tree args = NULL_TREE;
2413 int length = TMPL_PARMS_DEPTH (current_template_parms);
2416 /* If there is only one level of template parameters, we do not
2417 create a TREE_VEC of TREE_VECs. Instead, we return a single
2418 TREE_VEC containing the arguments. */
2420 args = make_tree_vec (length);
2422 for (header = current_template_parms; header; header = TREE_CHAIN (header))
2424 tree a = copy_node (TREE_VALUE (header));
2427 TREE_TYPE (a) = NULL_TREE;
2428 for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i)
2430 tree t = TREE_VEC_ELT (a, i);
2432 /* T will be a list if we are called from within a
2433 begin/end_template_parm_list pair, but a vector directly
2434 if within a begin/end_member_template_processing pair. */
2435 if (TREE_CODE (t) == TREE_LIST)
2439 if (TREE_CODE (t) == TYPE_DECL
2440 || TREE_CODE (t) == TEMPLATE_DECL)
2443 t = DECL_INITIAL (t);
2444 TREE_VEC_ELT (a, i) = t;
2449 TREE_VEC_ELT (args, --l) = a;
2457 /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated
2458 template PARMS. If MEMBER_TEMPLATE_P is true, the new template is
2459 a member template. Used by push_template_decl below. */
2462 build_template_decl (tree decl, tree parms, bool member_template_p)
2464 tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE);
2465 DECL_TEMPLATE_PARMS (tmpl) = parms;
2466 DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl);
2467 DECL_MEMBER_TEMPLATE_P (tmpl) = member_template_p;
2468 if (DECL_LANG_SPECIFIC (decl))
2470 DECL_STATIC_FUNCTION_P (tmpl) = DECL_STATIC_FUNCTION_P (decl);
2471 DECL_CONSTRUCTOR_P (tmpl) = DECL_CONSTRUCTOR_P (decl);
2472 DECL_DESTRUCTOR_P (tmpl) = DECL_DESTRUCTOR_P (decl);
2473 DECL_NONCONVERTING_P (tmpl) = DECL_NONCONVERTING_P (decl);
2474 DECL_ASSIGNMENT_OPERATOR_P (tmpl) = DECL_ASSIGNMENT_OPERATOR_P (decl);
2475 if (DECL_OVERLOADED_OPERATOR_P (decl))
2476 SET_OVERLOADED_OPERATOR_CODE (tmpl,
2477 DECL_OVERLOADED_OPERATOR_P (decl));
2483 struct template_parm_data
2485 /* The level of the template parameters we are currently
2489 /* The index of the specialization argument we are currently
2493 /* An array whose size is the number of template parameters. The
2494 elements are nonzero if the parameter has been used in any one
2495 of the arguments processed so far. */
2498 /* An array whose size is the number of template arguments. The
2499 elements are nonzero if the argument makes use of template
2500 parameters of this level. */
2501 int* arg_uses_template_parms;
2504 /* Subroutine of push_template_decl used to see if each template
2505 parameter in a partial specialization is used in the explicit
2506 argument list. If T is of the LEVEL given in DATA (which is
2507 treated as a template_parm_data*), then DATA->PARMS is marked
2511 mark_template_parm (tree t, void* data)
2515 struct template_parm_data* tpd = (struct template_parm_data*) data;
2517 if (TREE_CODE (t) == TEMPLATE_PARM_INDEX)
2519 level = TEMPLATE_PARM_LEVEL (t);
2520 idx = TEMPLATE_PARM_IDX (t);
2524 level = TEMPLATE_TYPE_LEVEL (t);
2525 idx = TEMPLATE_TYPE_IDX (t);
2528 if (level == tpd->level)
2530 tpd->parms[idx] = 1;
2531 tpd->arg_uses_template_parms[tpd->current_arg] = 1;
2534 /* Return zero so that for_each_template_parm will continue the
2535 traversal of the tree; we want to mark *every* template parm. */
2539 /* Process the partial specialization DECL. */
2542 process_partial_specialization (tree decl)
2544 tree type = TREE_TYPE (decl);
2545 tree maintmpl = CLASSTYPE_TI_TEMPLATE (type);
2546 tree specargs = CLASSTYPE_TI_ARGS (type);
2547 tree inner_args = INNERMOST_TEMPLATE_ARGS (specargs);
2548 tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms);
2549 tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl);
2550 int nargs = TREE_VEC_LENGTH (inner_args);
2551 int ntparms = TREE_VEC_LENGTH (inner_parms);
2553 int did_error_intro = 0;
2554 struct template_parm_data tpd;
2555 struct template_parm_data tpd2;
2557 /* We check that each of the template parameters given in the
2558 partial specialization is used in the argument list to the
2559 specialization. For example:
2561 template <class T> struct S;
2562 template <class T> struct S<T*>;
2564 The second declaration is OK because `T*' uses the template
2565 parameter T, whereas
2567 template <class T> struct S<int>;
2569 is no good. Even trickier is:
2580 The S2<T> declaration is actually invalid; it is a
2581 full-specialization. Of course,
2584 struct S2<T (*)(U)>;
2586 or some such would have been OK. */
2587 tpd.level = TMPL_PARMS_DEPTH (current_template_parms);
2588 tpd.parms = alloca (sizeof (int) * ntparms);
2589 memset (tpd.parms, 0, sizeof (int) * ntparms);
2591 tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs);
2592 memset (tpd.arg_uses_template_parms, 0, sizeof (int) * nargs);
2593 for (i = 0; i < nargs; ++i)
2595 tpd.current_arg = i;
2596 for_each_template_parm (TREE_VEC_ELT (inner_args, i),
2597 &mark_template_parm,
2601 for (i = 0; i < ntparms; ++i)
2602 if (tpd.parms[i] == 0)
2604 /* One of the template parms was not used in the
2606 if (!did_error_intro)
2608 error ("template parameters not used in partial specialization:");
2609 did_error_intro = 1;
2612 error (" %qD", TREE_VALUE (TREE_VEC_ELT (inner_parms, i)));
2615 /* [temp.class.spec]
2617 The argument list of the specialization shall not be identical to
2618 the implicit argument list of the primary template. */
2619 if (comp_template_args
2621 INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE
2623 error ("partial specialization %qT does not specialize any template arguments", type);
2625 /* [temp.class.spec]
2627 A partially specialized non-type argument expression shall not
2628 involve template parameters of the partial specialization except
2629 when the argument expression is a simple identifier.
2631 The type of a template parameter corresponding to a specialized
2632 non-type argument shall not be dependent on a parameter of the
2634 gcc_assert (nargs == DECL_NTPARMS (maintmpl));
2636 for (i = 0; i < nargs; ++i)
2638 tree arg = TREE_VEC_ELT (inner_args, i);
2639 if (/* These first two lines are the `non-type' bit. */
2641 && TREE_CODE (arg) != TEMPLATE_DECL
2642 /* This next line is the `argument expression is not just a
2643 simple identifier' condition and also the `specialized
2644 non-type argument' bit. */
2645 && TREE_CODE (arg) != TEMPLATE_PARM_INDEX)
2647 if (tpd.arg_uses_template_parms[i])
2648 error ("template argument %qE involves template parameter(s)", arg);
2651 /* Look at the corresponding template parameter,
2652 marking which template parameters its type depends
2655 TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms,
2660 /* We haven't yet initialized TPD2. Do so now. */
2661 tpd2.arg_uses_template_parms
2662 = alloca (sizeof (int) * nargs);
2663 /* The number of parameters here is the number in the
2664 main template, which, as checked in the assertion
2666 tpd2.parms = alloca (sizeof (int) * nargs);
2668 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl));
2671 /* Mark the template parameters. But this time, we're
2672 looking for the template parameters of the main
2673 template, not in the specialization. */
2674 tpd2.current_arg = i;
2675 tpd2.arg_uses_template_parms[i] = 0;
2676 memset (tpd2.parms, 0, sizeof (int) * nargs);
2677 for_each_template_parm (type,
2678 &mark_template_parm,
2682 if (tpd2.arg_uses_template_parms [i])
2684 /* The type depended on some template parameters.
2685 If they are fully specialized in the
2686 specialization, that's OK. */
2688 for (j = 0; j < nargs; ++j)
2689 if (tpd2.parms[j] != 0
2690 && tpd.arg_uses_template_parms [j])
2692 error ("type %qT of template argument %qE depends "
2693 "on template parameter(s)",
2703 if (retrieve_specialization (maintmpl, specargs,
2704 /*class_specializations_p=*/true))
2705 /* We've already got this specialization. */
2708 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)
2709 = tree_cons (inner_args, inner_parms,
2710 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl));
2711 TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type;
2715 /* Check that a template declaration's use of default arguments is not
2716 invalid. Here, PARMS are the template parameters. IS_PRIMARY is
2717 nonzero if DECL is the thing declared by a primary template.
2718 IS_PARTIAL is nonzero if DECL is a partial specialization. */
2721 check_default_tmpl_args (tree decl, tree parms, int is_primary, int is_partial)
2724 int last_level_to_check;
2729 A default template-argument shall not be specified in a
2730 function template declaration or a function template definition, nor
2731 in the template-parameter-list of the definition of a member of a
2734 if (TREE_CODE (CP_DECL_CONTEXT (decl)) == FUNCTION_DECL)
2735 /* You can't have a function template declaration in a local
2736 scope, nor you can you define a member of a class template in a
2740 if (current_class_type
2741 && !TYPE_BEING_DEFINED (current_class_type)
2742 && DECL_LANG_SPECIFIC (decl)
2743 /* If this is either a friend defined in the scope of the class
2744 or a member function. */
2745 && (DECL_FUNCTION_MEMBER_P (decl)
2746 ? same_type_p (DECL_CONTEXT (decl), current_class_type)
2747 : DECL_FRIEND_CONTEXT (decl)
2748 ? same_type_p (DECL_FRIEND_CONTEXT (decl), current_class_type)
2750 /* And, if it was a member function, it really was defined in
2751 the scope of the class. */
2752 && (!DECL_FUNCTION_MEMBER_P (decl)
2753 || DECL_INITIALIZED_IN_CLASS_P (decl)))
2754 /* We already checked these parameters when the template was
2755 declared, so there's no need to do it again now. This function
2756 was defined in class scope, but we're processing it's body now
2757 that the class is complete. */
2762 If a template-parameter has a default template-argument, all
2763 subsequent template-parameters shall have a default
2764 template-argument supplied. */
2765 for (parm_level = parms; parm_level; parm_level = TREE_CHAIN (parm_level))
2767 tree inner_parms = TREE_VALUE (parm_level);
2768 int ntparms = TREE_VEC_LENGTH (inner_parms);
2769 int seen_def_arg_p = 0;
2772 for (i = 0; i < ntparms; ++i)
2774 tree parm = TREE_VEC_ELT (inner_parms, i);
2775 if (TREE_PURPOSE (parm))
2777 else if (seen_def_arg_p)
2779 error ("no default argument for %qD", TREE_VALUE (parm));
2780 /* For better subsequent error-recovery, we indicate that
2781 there should have been a default argument. */
2782 TREE_PURPOSE (parm) = error_mark_node;
2787 if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary)
2788 /* For an ordinary class template, default template arguments are
2789 allowed at the innermost level, e.g.:
2790 template <class T = int>
2792 but, in a partial specialization, they're not allowed even
2793 there, as we have in [temp.class.spec]:
2795 The template parameter list of a specialization shall not
2796 contain default template argument values.
2798 So, for a partial specialization, or for a function template,
2799 we look at all of them. */
2802 /* But, for a primary class template that is not a partial
2803 specialization we look at all template parameters except the
2805 parms = TREE_CHAIN (parms);
2807 /* Figure out what error message to issue. */
2808 if (TREE_CODE (decl) == FUNCTION_DECL)
2809 msg = "default template arguments may not be used in function templates";
2810 else if (is_partial)
2811 msg = "default template arguments may not be used in partial specializations";
2813 msg = "default argument for template parameter for class enclosing %qD";
2815 if (current_class_type && TYPE_BEING_DEFINED (current_class_type))
2816 /* If we're inside a class definition, there's no need to
2817 examine the parameters to the class itself. On the one
2818 hand, they will be checked when the class is defined, and,
2819 on the other, default arguments are valid in things like:
2820 template <class T = double>
2821 struct S { template <class U> void f(U); };
2822 Here the default argument for `S' has no bearing on the
2823 declaration of `f'. */
2824 last_level_to_check = template_class_depth (current_class_type) + 1;
2826 /* Check everything. */
2827 last_level_to_check = 0;
2829 for (parm_level = parms;
2830 parm_level && TMPL_PARMS_DEPTH (parm_level) >= last_level_to_check;
2831 parm_level = TREE_CHAIN (parm_level))
2833 tree inner_parms = TREE_VALUE (parm_level);
2837 ntparms = TREE_VEC_LENGTH (inner_parms);
2838 for (i = 0; i < ntparms; ++i)
2839 if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)))
2847 /* Clear out the default argument so that we are not
2849 TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE;
2852 /* At this point, if we're still interested in issuing messages,
2853 they must apply to classes surrounding the object declared. */
2855 msg = "default argument for template parameter for class enclosing %qD";
2859 /* Worker for push_template_decl_real, called via
2860 for_each_template_parm. DATA is really an int, indicating the
2861 level of the parameters we are interested in. If T is a template
2862 parameter of that level, return nonzero. */
2865 template_parm_this_level_p (tree t, void* data)
2867 int this_level = *(int *)data;
2870 if (TREE_CODE (t) == TEMPLATE_PARM_INDEX)
2871 level = TEMPLATE_PARM_LEVEL (t);
2873 level = TEMPLATE_TYPE_LEVEL (t);
2874 return level == this_level;
2877 /* Creates a TEMPLATE_DECL for the indicated DECL using the template
2878 parameters given by current_template_args, or reuses a
2879 previously existing one, if appropriate. Returns the DECL, or an
2880 equivalent one, if it is replaced via a call to duplicate_decls.
2882 If IS_FRIEND is nonzero, DECL is a friend declaration. */
2885 push_template_decl_real (tree decl, int is_friend)
2893 int new_template_p = 0;
2894 /* True if the template is a member template, in the sense of
2896 bool member_template_p = false;
2898 if (decl == error_mark_node)
2901 /* See if this is a partial specialization. */
2902 is_partial = (DECL_IMPLICIT_TYPEDEF_P (decl)
2903 && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE
2904 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl)));
2906 is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl));
2909 /* For a friend, we want the context of the friend function, not
2910 the type of which it is a friend. */
2911 ctx = DECL_CONTEXT (decl);
2912 else if (CP_DECL_CONTEXT (decl)
2913 && TREE_CODE (CP_DECL_CONTEXT (decl)) != NAMESPACE_DECL)
2914 /* In the case of a virtual function, we want the class in which
2916 ctx = CP_DECL_CONTEXT (decl);
2918 /* Otherwise, if we're currently defining some class, the DECL
2919 is assumed to be a member of the class. */
2920 ctx = current_scope ();
2922 if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL)
2925 if (!DECL_CONTEXT (decl))
2926 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
2928 /* See if this is a primary template. */
2929 primary = template_parm_scope_p ();
2933 if (DECL_CLASS_SCOPE_P (decl))
2934 member_template_p = true;
2935 if (current_lang_name == lang_name_c)
2936 error ("template with C linkage");
2937 else if (TREE_CODE (decl) == TYPE_DECL
2938 && ANON_AGGRNAME_P (DECL_NAME (decl)))
2939 error ("template class without a name");
2940 else if (TREE_CODE (decl) == FUNCTION_DECL)
2942 if (DECL_DESTRUCTOR_P (decl))
2946 A destructor shall not be a member template. */
2947 error ("destructor %qD declared as member template", decl);
2948 return error_mark_node;
2950 if (NEW_DELETE_OPNAME_P (DECL_NAME (decl))
2951 && (!TYPE_ARG_TYPES (TREE_TYPE (decl))
2952 || TYPE_ARG_TYPES (TREE_TYPE (decl)) == void_list_node
2953 || !TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl)))
2954 || (TREE_CHAIN (TYPE_ARG_TYPES ((TREE_TYPE (decl))))
2955 == void_list_node)))
2957 /* [basic.stc.dynamic.allocation]
2959 An allocation function can be a function
2960 template. ... Template allocation functions shall
2961 have two or more parameters. */
2962 error ("invalid template declaration of %qD", decl);
2966 else if ((DECL_IMPLICIT_TYPEDEF_P (decl)
2967 && CLASS_TYPE_P (TREE_TYPE (decl)))
2968 || (TREE_CODE (decl) == VAR_DECL && ctx && CLASS_TYPE_P (ctx)))
2972 error ("template declaration of %q#D", decl);
2973 return error_mark_node;
2977 /* Check to see that the rules regarding the use of default
2978 arguments are not being violated. */
2979 check_default_tmpl_args (decl, current_template_parms,
2980 primary, is_partial);
2983 return process_partial_specialization (decl);
2985 args = current_template_args ();
2988 || TREE_CODE (ctx) == FUNCTION_DECL
2989 || (CLASS_TYPE_P (ctx) && TYPE_BEING_DEFINED (ctx))
2990 || (is_friend && !DECL_TEMPLATE_INFO (decl)))
2992 if (DECL_LANG_SPECIFIC (decl)
2993 && DECL_TEMPLATE_INFO (decl)
2994 && DECL_TI_TEMPLATE (decl))
2995 tmpl = DECL_TI_TEMPLATE (decl);
2996 /* If DECL is a TYPE_DECL for a class-template, then there won't
2997 be DECL_LANG_SPECIFIC. The information equivalent to
2998 DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */
2999 else if (DECL_IMPLICIT_TYPEDEF_P (decl)
3000 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
3001 && TYPE_TI_TEMPLATE (TREE_TYPE (decl)))
3003 /* Since a template declaration already existed for this
3004 class-type, we must be redeclaring it here. Make sure
3005 that the redeclaration is valid. */
3006 redeclare_class_template (TREE_TYPE (decl),
3007 current_template_parms);
3008 /* We don't need to create a new TEMPLATE_DECL; just use the
3009 one we already had. */
3010 tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl));
3014 tmpl = build_template_decl (decl, current_template_parms,
3018 if (DECL_LANG_SPECIFIC (decl)
3019 && DECL_TEMPLATE_SPECIALIZATION (decl))
3021 /* A specialization of a member template of a template
3023 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl);
3024 DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl);
3025 DECL_TEMPLATE_INFO (decl) = NULL_TREE;
3031 tree a, t, current, parms;
3034 if (TREE_CODE (decl) == TYPE_DECL)
3036 if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl)))
3037 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
3038 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
3039 && TYPE_TI_TEMPLATE (TREE_TYPE (decl)))
3040 tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl));
3043 error ("%qD does not declare a template type", decl);
3047 else if (!DECL_LANG_SPECIFIC (decl) || !DECL_TEMPLATE_INFO (decl))
3049 error ("template definition of non-template %q#D", decl);
3053 tmpl = DECL_TI_TEMPLATE (decl);
3055 if (DECL_FUNCTION_TEMPLATE_P (tmpl)
3056 && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl)
3057 && DECL_TEMPLATE_SPECIALIZATION (decl)
3058 && DECL_MEMBER_TEMPLATE_P (tmpl))
3062 /* The declaration is a specialization of a member
3063 template, declared outside the class. Therefore, the
3064 innermost template arguments will be NULL, so we
3065 replace them with the arguments determined by the
3066 earlier call to check_explicit_specialization. */
3067 args = DECL_TI_ARGS (decl);
3070 = build_template_decl (decl, current_template_parms,
3072 DECL_TEMPLATE_RESULT (new_tmpl) = decl;
3073 TREE_TYPE (new_tmpl) = TREE_TYPE (decl);
3074 DECL_TI_TEMPLATE (decl) = new_tmpl;
3075 SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl);
3076 DECL_TEMPLATE_INFO (new_tmpl)
3077 = tree_cons (tmpl, args, NULL_TREE);
3079 register_specialization (new_tmpl,
3080 most_general_template (tmpl),
3085 /* Make sure the template headers we got make sense. */
3087 parms = DECL_TEMPLATE_PARMS (tmpl);
3088 i = TMPL_PARMS_DEPTH (parms);
3089 if (TMPL_ARGS_DEPTH (args) != i)
3091 error ("expected %d levels of template parms for %q#D, got %d",
3092 i, decl, TMPL_ARGS_DEPTH (args));
3095 for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms))
3097 a = TMPL_ARGS_LEVEL (args, i);
3098 t = INNERMOST_TEMPLATE_PARMS (parms);
3100 if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a))
3102 if (current == decl)
3103 error ("got %d template parameters for %q#D",
3104 TREE_VEC_LENGTH (a), decl);
3106 error ("got %d template parameters for %q#T",
3107 TREE_VEC_LENGTH (a), current);
3108 error (" but %d required", TREE_VEC_LENGTH (t));
3111 /* Perhaps we should also check that the parms are used in the
3112 appropriate qualifying scopes in the declarator? */
3114 if (current == decl)
3117 current = TYPE_CONTEXT (current);
3121 DECL_TEMPLATE_RESULT (tmpl) = decl;
3122 TREE_TYPE (tmpl) = TREE_TYPE (decl);
3124 /* Push template declarations for global functions and types. Note
3125 that we do not try to push a global template friend declared in a
3126 template class; such a thing may well depend on the template
3127 parameters of the class. */
3128 if (new_template_p && !ctx
3129 && !(is_friend && template_class_depth (current_class_type) > 0))
3131 tmpl = pushdecl_namespace_level (tmpl);
3132 if (tmpl == error_mark_node)
3133 return error_mark_node;
3135 /* Hide template friend classes that haven't been declared yet. */
3136 if (is_friend && TREE_CODE (decl) == TYPE_DECL)
3138 DECL_ANTICIPATED (tmpl) = 1;
3139 DECL_FRIEND_P (tmpl) = 1;
3145 DECL_PRIMARY_TEMPLATE (tmpl) = tmpl;
3146 if (DECL_CONV_FN_P (tmpl))
3148 int depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl));
3150 /* It is a conversion operator. See if the type converted to
3151 depends on innermost template operands. */
3153 if (uses_template_parms_level (TREE_TYPE (TREE_TYPE (tmpl)),
3155 DECL_TEMPLATE_CONV_FN_P (tmpl) = 1;
3159 /* The DECL_TI_ARGS of DECL contains full set of arguments referring
3160 back to its most general template. If TMPL is a specialization,
3161 ARGS may only have the innermost set of arguments. Add the missing
3162 argument levels if necessary. */
3163 if (DECL_TEMPLATE_INFO (tmpl))
3164 args = add_outermost_template_args (DECL_TI_ARGS (tmpl), args);
3166 info = tree_cons (tmpl, args, NULL_TREE);
3168 if (DECL_IMPLICIT_TYPEDEF_P (decl))
3170 SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info);
3171 if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL)
3172 && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE
3173 /* Don't change the name if we've already set it up. */
3174 && !IDENTIFIER_TEMPLATE (DECL_NAME (decl)))
3175 DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl));
3177 else if (DECL_LANG_SPECIFIC (decl))
3178 DECL_TEMPLATE_INFO (decl) = info;
3180 return DECL_TEMPLATE_RESULT (tmpl);
3184 push_template_decl (tree decl)
3186 return push_template_decl_real (decl, 0);
3189 /* Called when a class template TYPE is redeclared with the indicated
3190 template PARMS, e.g.:
3192 template <class T> struct S;
3193 template <class T> struct S {}; */
3196 redeclare_class_template (tree type, tree parms)
3202 if (!TYPE_TEMPLATE_INFO (type))
3204 error ("%qT is not a template type", type);
3208 tmpl = TYPE_TI_TEMPLATE (type);
3209 if (!PRIMARY_TEMPLATE_P (tmpl))
3210 /* The type is nested in some template class. Nothing to worry
3211 about here; there are no new template parameters for the nested
3217 error ("template specifiers not specified in declaration of %qD",
3222 parms = INNERMOST_TEMPLATE_PARMS (parms);
3223 tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl);
3225 if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms))
3227 cp_error_at ("previous declaration %qD", tmpl);
3228 error ("used %d template parameter(s) instead of %d",
3229 TREE_VEC_LENGTH (tmpl_parms),
3230 TREE_VEC_LENGTH (parms));
3234 for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i)
3236 tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i));
3237 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
3238 tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i));
3239 tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i));
3241 /* TMPL_PARM and PARM can be either TYPE_DECL, PARM_DECL, or
3243 if (TREE_CODE (tmpl_parm) != TREE_CODE (parm)
3244 || (TREE_CODE (tmpl_parm) != TYPE_DECL
3245 && !same_type_p (TREE_TYPE (tmpl_parm), TREE_TYPE (parm))))
3247 cp_error_at ("template parameter %q#D", tmpl_parm);
3248 error ("redeclared here as %q#D", parm);
3252 if (tmpl_default != NULL_TREE && parm_default != NULL_TREE)
3254 /* We have in [temp.param]:
3256 A template-parameter may not be given default arguments
3257 by two different declarations in the same scope. */
3258 error ("redefinition of default argument for %q#D", parm);
3259 error ("%J original definition appeared here", tmpl_parm);
3263 if (parm_default != NULL_TREE)
3264 /* Update the previous template parameters (which are the ones
3265 that will really count) with the new default value. */
3266 TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default;
3267 else if (tmpl_default != NULL_TREE)
3268 /* Update the new parameters, too; they'll be used as the
3269 parameters for any members. */
3270 TREE_PURPOSE (TREE_VEC_ELT (parms, i)) = tmpl_default;
3274 /* Simplify EXPR if it is a non-dependent expression. Returns the
3275 (possibly simplified) expression. */
3278 fold_non_dependent_expr (tree expr)
3280 /* If we're in a template, but EXPR isn't value dependent, simplify
3281 it. We're supposed to treat:
3283 template <typename T> void f(T[1 + 1]);
3284 template <typename T> void f(T[2]);
3286 as two declarations of the same function, for example. */
3287 if (processing_template_decl
3288 && !type_dependent_expression_p (expr)
3289 && !value_dependent_expression_p (expr))
3291 HOST_WIDE_INT saved_processing_template_decl;
3293 saved_processing_template_decl = processing_template_decl;
3294 processing_template_decl = 0;
3295 expr = tsubst_copy_and_build (expr,
3298 /*in_decl=*/NULL_TREE,
3299 /*function_p=*/false);
3300 processing_template_decl = saved_processing_template_decl;
3305 /* EXPR is an expression which is used in a constant-expression context.
3306 For instance, it could be a VAR_DECL with a constant initializer.
3307 Extract the innest constant expression.
3309 This is basically a more powerful version of
3310 integral_constant_value, which can be used also in templates where
3311 initializers can maintain a syntactic rather than semantic form
3312 (even if they are non-dependent, for access-checking purposes). */
3315 fold_decl_constant_value (tree expr)
3317 tree const_expr = expr;
3320 expr = fold_non_dependent_expr (const_expr);
3321 const_expr = integral_constant_value (expr);
3323 while (expr != const_expr);
3328 /* Subroutine of convert_nontype_argument. Converts EXPR to TYPE, which
3329 must be a function or a pointer-to-function type, as specified
3330 in [temp.arg.nontype]: disambiguate EXPR if it is an overload set,
3331 and check that the resulting function has external linkage. */
3334 convert_nontype_argument_function (tree type, tree expr)
3339 fn = instantiate_type (type, fns, tf_none);
3340 if (fn == error_mark_node)
3341 return error_mark_node;
3344 if (TREE_CODE (fn_no_ptr) == ADDR_EXPR)
3345 fn_no_ptr = TREE_OPERAND (fn_no_ptr, 0);
3347 /* [temp.arg.nontype]/1
3349 A template-argument for a non-type, non-template template-parameter
3352 -- the address of an object or function with external linkage. */
3353 if (!DECL_EXTERNAL_LINKAGE_P (fn_no_ptr))
3355 error ("%qE is not a valid template argument for type %qT "
3356 "because function %qD has not external linkage",
3357 expr, type, fn_no_ptr);
3364 /* Attempt to convert the non-type template parameter EXPR to the
3365 indicated TYPE. If the conversion is successful, return the
3366 converted value. If the conversion is unsuccessful, return
3367 NULL_TREE if we issued an error message, or error_mark_node if we
3368 did not. We issue error messages for out-and-out bad template
3369 parameters, but not simply because the conversion failed, since we
3370 might be just trying to do argument deduction. Both TYPE and EXPR
3371 must be non-dependent.
3373 The conversion follows the special rules described in
3374 [temp.arg.nontype], and it is much more strict than an implicit
3377 This function is called twice for each template argument (see
3378 lookup_template_class for a more accurate description of this
3379 problem). This means that we need to handle expressions which
3380 are not valid in a C++ source, but can be created from the
3381 first call (for instance, casts to perform conversions). These
3382 hacks can go away after we fix the double coercion problem. */
3385 convert_nontype_argument (tree type, tree expr)
3389 /* Detect immediately string literals as invalid non-type argument.
3390 This special-case is not needed for correctness (we would easily
3391 catch this later), but only to provide better diagnostic for this
3392 common user mistake. As suggested by DR 100, we do not mention
3393 linkage issues in the diagnostic as this is not the point. */
3394 if (TREE_CODE (expr) == STRING_CST)
3396 error ("%qE is not a valid template argument for type %qT "
3397 "because string literals can never be used in this context",
3402 /* If we are in a template, EXPR may be non-dependent, but still
3403 have a syntactic, rather than semantic, form. For example, EXPR
3404 might be a SCOPE_REF, rather than the VAR_DECL to which the
3405 SCOPE_REF refers. Preserving the qualifying scope is necessary
3406 so that access checking can be performed when the template is
3407 instantiated -- but here we need the resolved form so that we can
3408 convert the argument. */
3409 expr = fold_non_dependent_expr (expr);
3410 expr_type = TREE_TYPE (expr);
3412 /* HACK: Due to double coercion, we can get a
3413 NOP_EXPR<REFERENCE_TYPE>(ADDR_EXPR<POINTER_TYPE> (arg)) here,
3414 which is the tree that we built on the first call (see
3415 below when coercing to reference to object or to reference to
3416 function). We just strip everything and get to the arg.
3417 See g++.old-deja/g++.oliva/template4.C and g++.dg/template/nontype9.C
3419 if (TREE_CODE (expr) == NOP_EXPR)
3421 if (TYPE_REF_OBJ_P (type) || TYPE_REFFN_P (type))
3423 /* ??? Maybe we could use convert_from_reference here, but we
3424 would need to relax its constraints because the NOP_EXPR
3425 could actually change the type to something more cv-qualified,
3426 and this is not folded by convert_from_reference. */
3427 tree addr = TREE_OPERAND (expr, 0);
3428 gcc_assert (TREE_CODE (expr_type) == REFERENCE_TYPE);
3429 gcc_assert (TREE_CODE (addr) == ADDR_EXPR);
3430 gcc_assert (TREE_CODE (TREE_TYPE (addr)) == POINTER_TYPE);
3431 gcc_assert (same_type_ignoring_top_level_qualifiers_p
3432 (TREE_TYPE (expr_type),
3433 TREE_TYPE (TREE_TYPE (addr))));
3435 expr = TREE_OPERAND (addr, 0);
3436 expr_type = TREE_TYPE (expr);
3439 /* We could also generate a NOP_EXPR(ADDR_EXPR()) when the
3440 parameter is a pointer to object, through decay and
3441 qualification conversion. Let's strip everything. */
3442 else if (TYPE_PTROBV_P (type))
3445 gcc_assert (TREE_CODE (expr) == ADDR_EXPR);
3446 gcc_assert (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE);
3447 /* Skip the ADDR_EXPR only if it is part of the decay for
3448 an array. Otherwise, it is part of the original argument
3449 in the source code. */
3450 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == ARRAY_TYPE)
3451 expr = TREE_OPERAND (expr, 0);
3452 expr_type = TREE_TYPE (expr);
3456 /* [temp.arg.nontype]/5, bullet 1
3458 For a non-type template-parameter of integral or enumeration type,
3459 integral promotions (_conv.prom_) and integral conversions
3460 (_conv.integral_) are applied. */
3461 if (INTEGRAL_TYPE_P (type))
3463 if (!INTEGRAL_TYPE_P (expr_type))
3464 return error_mark_node;
3466 expr = fold_decl_constant_value (expr);
3467 /* Notice that there are constant expressions like '4 % 0' which
3468 do not fold into integer constants. */
3469 if (TREE_CODE (expr) != INTEGER_CST)
3471 error ("%qE is not a valid template argument for type %qT "
3472 "because it is a non-constant expression", expr, type);
3476 /* At this point, an implicit conversion does what we want,
3477 because we already know that the expression is of integral
3479 expr = ocp_convert (type, expr, CONV_IMPLICIT, LOOKUP_PROTECT);
3480 if (expr == error_mark_node)
3481 return error_mark_node;
3483 /* Conversion was allowed: fold it to a bare integer constant. */
3486 /* [temp.arg.nontype]/5, bullet 2
3488 For a non-type template-parameter of type pointer to object,
3489 qualification conversions (_conv.qual_) and the array-to-pointer
3490 conversion (_conv.array_) are applied. */
3491 else if (TYPE_PTROBV_P (type))
3493 /* [temp.arg.nontype]/1 (TC1 version, DR 49):
3495 A template-argument for a non-type, non-template template-parameter
3496 shall be one of: [...]
3498 -- the name of a non-type template-parameter;
3499 -- the address of an object or function with external linkage, [...]
3500 expressed as "& id-expression" where the & is optional if the name
3501 refers to a function or array, or if the corresponding
3502 template-parameter is a reference.
3504 Here, we do not care about functions, as they are invalid anyway
3505 for a parameter of type pointer-to-object. */
3506 bool constant_address_p =
3507 (TREE_CODE (expr) == ADDR_EXPR
3508 || TREE_CODE (expr_type) == ARRAY_TYPE
3509 || (DECL_P (expr) && DECL_TEMPLATE_PARM_P (expr)));
3511 expr = decay_conversion (expr);
3512 if (expr == error_mark_node)
3513 return error_mark_node;
3515 expr = perform_qualification_conversions (type, expr);
3516 if (expr == error_mark_node)
3517 return error_mark_node;
3519 if (!constant_address_p)
3521 error ("%qE is not a valid template argument for type %qT "
3522 "because it is not a constant pointer", expr, type);
3526 /* [temp.arg.nontype]/5, bullet 3
3528 For a non-type template-parameter of type reference to object, no
3529 conversions apply. The type referred to by the reference may be more
3530 cv-qualified than the (otherwise identical) type of the
3531 template-argument. The template-parameter is bound directly to the
3532 template-argument, which must be an lvalue. */
3533 else if (TYPE_REF_OBJ_P (type))
3535 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (type),
3537 return error_mark_node;
3539 if (!at_least_as_qualified_p (TREE_TYPE (type), expr_type))
3541 error ("%qE is not a valid template argument for type %qT "
3542 "because of conflicts in cv-qualification", expr, type);
3546 if (!real_lvalue_p (expr))
3548 error ("%qE is not a valid template argument for type %qT "
3549 "because it is not a lvalue", expr, type);
3553 /* [temp.arg.nontype]/1
3555 A template-argument for a non-type, non-template template-parameter
3556 shall be one of: [...]
3558 -- the address of an object or function with external linkage. */
3559 if (!DECL_EXTERNAL_LINKAGE_P (expr))
3561 error ("%qE is not a valid template argument for type %qT "
3562 "because object %qD has not external linkage",
3567 expr = build_nop (type, build_address (expr));
3569 /* [temp.arg.nontype]/5, bullet 4
3571 For a non-type template-parameter of type pointer to function, only
3572 the function-to-pointer conversion (_conv.func_) is applied. If the
3573 template-argument represents a set of overloaded functions (or a
3574 pointer to such), the matching function is selected from the set
3576 else if (TYPE_PTRFN_P (type))
3578 /* If the argument is a template-id, we might not have enough
3579 context information to decay the pointer.
3580 ??? Why static5.C requires decay and subst1.C works fine
3582 if (!type_unknown_p (expr_type))
3584 expr = decay_conversion (expr);
3585 if (expr == error_mark_node)
3586 return error_mark_node;
3589 expr = convert_nontype_argument_function (type, expr);
3590 if (!expr || expr == error_mark_node)
3593 /* [temp.arg.nontype]/5, bullet 5
3595 For a non-type template-parameter of type reference to function, no
3596 conversions apply. If the template-argument represents a set of
3597 overloaded functions, the matching function is selected from the set
3599 else if (TYPE_REFFN_P (type))
3601 if (TREE_CODE (expr) == ADDR_EXPR)
3603 error ("%qE is not a valid template argument for type %qT "
3604 "because it is a pointer", expr, type);
3605 inform ("try using %qE instead", TREE_OPERAND (expr, 0));
3609 expr = convert_nontype_argument_function (TREE_TYPE (type), expr);
3610 if (!expr || expr == error_mark_node)
3613 expr = build_nop (type, build_address (expr));
3615 /* [temp.arg.nontype]/5, bullet 6
3617 For a non-type template-parameter of type pointer to member function,
3618 no conversions apply. If the template-argument represents a set of
3619 overloaded member functions, the matching member function is selected
3620 from the set (_over.over_). */
3621 else if (TYPE_PTRMEMFUNC_P (type))
3623 expr = instantiate_type (type, expr, tf_none);
3624 if (expr == error_mark_node)
3625 return error_mark_node;
3627 /* There is no way to disable standard conversions in
3628 resolve_address_of_overloaded_function (called by
3629 instantiate_type). It is possible that the call succeeded by
3630 converting &B::I to &D::I (where B is a base of D), so we need
3631 to reject this conversion here.
3633 Actually, even if there was a way to disable standard conversions,
3634 it would still be better to reject them here so that we can
3635 provide a superior diagnostic. */
3636 if (!same_type_p (TREE_TYPE (expr), type))
3638 /* Make sure we are just one standard conversion off. */
3639 gcc_assert (can_convert (type, TREE_TYPE (expr)));
3640 error ("%qE is not a valid template argument for type %qT "
3641 "because it is of type %qT", expr, type,
3643 inform ("standard conversions are not allowed in this context");
3647 /* [temp.arg.nontype]/5, bullet 7
3649 For a non-type template-parameter of type pointer to data member,
3650 qualification conversions (_conv.qual_) are applied. */
3651 else if (TYPE_PTRMEM_P (type))
3653 expr = perform_qualification_conversions (type, expr);
3654 if (expr == error_mark_node)
3657 /* A template non-type parameter must be one of the above. */
3661 /* Sanity check: did we actually convert the argument to the
3663 gcc_assert (same_type_p (type, TREE_TYPE (expr)));
3668 /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
3669 template template parameters. Both PARM_PARMS and ARG_PARMS are
3670 vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
3673 ARG_PARMS may contain more parameters than PARM_PARMS. If this is
3674 the case, then extra parameters must have default arguments.
3676 Consider the example:
3677 template <class T, class Allocator = allocator> class vector;
3678 template<template <class U> class TT> class C;
3680 C<vector> is a valid instantiation. PARM_PARMS for the above code
3681 contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for
3682 T and Allocator) and OUTER_ARGS contains the argument that is used to
3683 substitute the TT parameter. */
3686 coerce_template_template_parms (tree parm_parms,
3688 tsubst_flags_t complain,
3692 int nparms, nargs, i;
3695 gcc_assert (TREE_CODE (parm_parms) == TREE_VEC);
3696 gcc_assert (TREE_CODE (arg_parms) == TREE_VEC);
3698 nparms = TREE_VEC_LENGTH (parm_parms);
3699 nargs = TREE_VEC_LENGTH (arg_parms);
3701 /* The rule here is opposite of coerce_template_parms. */
3704 && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE))
3707 for (i = 0; i < nparms; ++i)
3709 parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i));
3710 arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i));
3712 if (arg == NULL_TREE || arg == error_mark_node
3713 || parm == NULL_TREE || parm == error_mark_node)
3716 if (TREE_CODE (arg) != TREE_CODE (parm))
3719 switch (TREE_CODE (parm))
3725 /* We encounter instantiations of templates like
3726 template <template <template <class> class> class TT>
3729 tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm);
3730 tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg);
3732 if (!coerce_template_template_parms
3733 (parmparm, argparm, complain, in_decl, outer_args))
3739 /* The tsubst call is used to handle cases such as
3741 template <int> class C {};
3742 template <class T, template <T> class TT> class D {};
3745 i.e. the parameter list of TT depends on earlier parameters. */
3746 if (!dependent_type_p (TREE_TYPE (arg))
3748 (tsubst (TREE_TYPE (parm), outer_args, complain, in_decl),
3760 /* Convert the indicated template ARG as necessary to match the
3761 indicated template PARM. Returns the converted ARG, or
3762 error_mark_node if the conversion was unsuccessful. Error and
3763 warning messages are issued under control of COMPLAIN. This
3764 conversion is for the Ith parameter in the parameter list. ARGS is
3765 the full set of template arguments deduced so far. */
3768 convert_template_argument (tree parm,
3771 tsubst_flags_t complain,
3777 int is_type, requires_type, is_tmpl_type, requires_tmpl_type;
3779 inner_args = INNERMOST_TEMPLATE_ARGS (args);
3781 if (TREE_CODE (arg) == TREE_LIST
3782 && TREE_CODE (TREE_VALUE (arg)) == OFFSET_REF)
3784 /* The template argument was the name of some
3785 member function. That's usually
3786 invalid, but static members are OK. In any
3787 case, grab the underlying fields/functions
3788 and issue an error later if required. */
3789 arg = TREE_VALUE (arg);
3790 TREE_TYPE (arg) = unknown_type_node;
3793 requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL;
3794 requires_type = (TREE_CODE (parm) == TYPE_DECL
3795 || requires_tmpl_type);
3797 is_tmpl_type = ((TREE_CODE (arg) == TEMPLATE_DECL
3798 && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL)
3799 || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM
3800 || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE);
3803 && (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM
3804 || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE))
3805 arg = TYPE_STUB_DECL (arg);
3807 is_type = TYPE_P (arg) || is_tmpl_type;
3809 if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF
3810 && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM)
3812 pedwarn ("to refer to a type member of a template parameter, "
3813 "use %<typename %E%>", arg);
3815 arg = make_typename_type (TREE_OPERAND (arg, 0),
3816 TREE_OPERAND (arg, 1),
3818 complain & tf_error);
3821 if (is_type != requires_type)
3825 if (complain & tf_error)
3827 error ("type/value mismatch at argument %d in template "
3828 "parameter list for %qD",
3831 error (" expected a constant of type %qT, got %qT",
3833 (is_tmpl_type ? DECL_NAME (arg) : arg));
3834 else if (requires_tmpl_type)
3835 error (" expected a class template, got %qE", arg);
3837 error (" expected a type, got %qE", arg);
3840 return error_mark_node;
3842 if (is_tmpl_type ^ requires_tmpl_type)
3844 if (in_decl && (complain & tf_error))
3846 error ("type/value mismatch at argument %d in template "
3847 "parameter list for %qD",
3850 error (" expected a type, got %qT", DECL_NAME (arg));
3852 error (" expected a class template, got %qT", arg);
3854 return error_mark_node;
3859 if (requires_tmpl_type)
3861 if (TREE_CODE (TREE_TYPE (arg)) == UNBOUND_CLASS_TEMPLATE)
3862 /* The number of argument required is not known yet.
3863 Just accept it for now. */
3864 val = TREE_TYPE (arg);
3867 tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm);
3868 tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg);
3870 if (coerce_template_template_parms (parmparm, argparm,
3876 /* TEMPLATE_TEMPLATE_PARM node is preferred over
3878 if (val != error_mark_node
3879 && DECL_TEMPLATE_TEMPLATE_PARM_P (val))
3880 val = TREE_TYPE (val);
3884 if (in_decl && (complain & tf_error))
3886 error ("type/value mismatch at argument %d in "
3887 "template parameter list for %qD",
3889 error (" expected a template of type %qD, got %qD",
3893 val = error_mark_node;
3902 tree t = tsubst (TREE_TYPE (parm), args, complain, in_decl);
3904 if (invalid_nontype_parm_type_p (t, complain))
3905 return error_mark_node;
3907 if (!uses_template_parms (arg) && !uses_template_parms (t))
3908 /* We used to call digest_init here. However, digest_init
3909 will report errors, which we don't want when complain
3910 is zero. More importantly, digest_init will try too
3911 hard to convert things: for example, `0' should not be
3912 converted to pointer type at this point according to
3913 the standard. Accepting this is not merely an
3914 extension, since deciding whether or not these
3915 conversions can occur is part of determining which
3916 function template to call, or whether a given explicit
3917 argument specification is valid. */
3918 val = convert_nontype_argument (t, arg);
3922 if (val == NULL_TREE)
3923 val = error_mark_node;
3924 else if (val == error_mark_node && (complain & tf_error))
3925 error ("could not convert template argument %qE to %qT", arg, t);
3931 /* Convert all template arguments to their appropriate types, and
3932 return a vector containing the innermost resulting template
3933 arguments. If any error occurs, return error_mark_node. Error and
3934 warning messages are issued under control of COMPLAIN.
3936 If REQUIRE_ALL_ARGUMENTS is nonzero, all arguments must be
3937 provided in ARGLIST, or else trailing parameters must have default
3938 values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument
3939 deduction for any unspecified trailing arguments. */
3942 coerce_template_parms (tree parms,
3945 tsubst_flags_t complain,
3946 int require_all_arguments)
3948 int nparms, nargs, i, lost = 0;
3951 tree new_inner_args;
3953 inner_args = INNERMOST_TEMPLATE_ARGS (args);
3954 nargs = inner_args ? NUM_TMPL_ARGS (inner_args) : 0;
3955 nparms = TREE_VEC_LENGTH (parms);
3959 && require_all_arguments
3960 && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE))
3962 if (complain & tf_error)
3964 error ("wrong number of template arguments (%d, should be %d)",
3968 cp_error_at ("provided for %qD", in_decl);
3971 return error_mark_node;
3974 new_inner_args = make_tree_vec (nparms);
3975 new_args = add_outermost_template_args (args, new_inner_args);
3976 for (i = 0; i < nparms; i++)
3981 /* Get the Ith template parameter. */
3982 parm = TREE_VEC_ELT (parms, i);
3984 /* Calculate the Ith argument. */
3986 arg = TREE_VEC_ELT (inner_args, i);
3987 else if (require_all_arguments)
3988 /* There must be a default arg in this case. */
3989 arg = tsubst_template_arg (TREE_PURPOSE (parm), new_args,
3995 if (arg == error_mark_node)
3997 if (complain & tf_error)
3998 error ("template argument %d is invalid", i + 1);
4001 arg = convert_template_argument (TREE_VALUE (parm),
4002 arg, new_args, complain, i,
4005 if (arg == error_mark_node)
4007 TREE_VEC_ELT (new_inner_args, i) = arg;
4011 return error_mark_node;
4013 return new_inner_args;
4016 /* Returns 1 if template args OT and NT are equivalent. */
4019 template_args_equal (tree ot, tree nt)
4024 if (TREE_CODE (nt) == TREE_VEC)
4025 /* For member templates */
4026 return TREE_CODE (ot) == TREE_VEC && comp_template_args (ot, nt);
4027 else if (TYPE_P (nt))
4028 return TYPE_P (ot) && same_type_p (ot, nt);
4029 else if (TREE_CODE (ot) == TREE_VEC || TYPE_P (ot))
4032 return cp_tree_equal (ot, nt);
4035 /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets
4036 of template arguments. Returns 0 otherwise. */
4039 comp_template_args (tree oldargs, tree newargs)
4043 if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs))
4046 for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i)
4048 tree nt = TREE_VEC_ELT (newargs, i);
4049 tree ot = TREE_VEC_ELT (oldargs, i);
4051 if (! template_args_equal (ot, nt))
4057 /* Given class template name and parameter list, produce a user-friendly name
4058 for the instantiation. */
4061 mangle_class_name_for_template (const char* name, tree parms, tree arglist)
4063 static struct obstack scratch_obstack;
4064 static char *scratch_firstobj;
4067 if (!scratch_firstobj)
4068 gcc_obstack_init (&scratch_obstack);
4070 obstack_free (&scratch_obstack, scratch_firstobj);
4071 scratch_firstobj = obstack_alloc (&scratch_obstack, 1);
4073 #define ccat(C) obstack_1grow (&scratch_obstack, (C));
4074 #define cat(S) obstack_grow (&scratch_obstack, (S), strlen (S))
4078 nparms = TREE_VEC_LENGTH (parms);
4079 arglist = INNERMOST_TEMPLATE_ARGS (arglist);
4080 gcc_assert (nparms == TREE_VEC_LENGTH (arglist));
4081 for (i = 0; i < nparms; i++)
4083 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
4084 tree arg = TREE_VEC_ELT (arglist, i);
4089 if (TREE_CODE (parm) == TYPE_DECL)
4091 cat (type_as_string (arg, TFF_CHASE_TYPEDEF));
4094 else if (TREE_CODE (parm) == TEMPLATE_DECL)
4096 if (TREE_CODE (arg) == TEMPLATE_DECL)
4098 /* Already substituted with real template. Just output
4099 the template name here */
4100 tree context = DECL_CONTEXT (arg);
4103 /* The template may be defined in a namespace, or
4104 may be a member template. */
4105 gcc_assert (TREE_CODE (context) == NAMESPACE_DECL
4106 || CLASS_TYPE_P (context));
4107 cat (decl_as_string (DECL_CONTEXT (arg),
4108 TFF_PLAIN_IDENTIFIER));
4111 cat (IDENTIFIER_POINTER (DECL_NAME (arg)));
4114 /* Output the parameter declaration. */
4115 cat (type_as_string (arg, TFF_CHASE_TYPEDEF));
4119 gcc_assert (TREE_CODE (parm) == PARM_DECL);
4121 /* No need to check arglist against parmlist here; we did that
4122 in coerce_template_parms, called from lookup_template_class. */
4123 cat (expr_as_string (arg, TFF_PLAIN_IDENTIFIER));
4126 char *bufp = obstack_next_free (&scratch_obstack);
4128 while (bufp[offset - 1] == ' ')
4130 obstack_blank_fast (&scratch_obstack, offset);
4132 /* B<C<char> >, not B<C<char>> */
4133 if (bufp[offset - 1] == '>')
4138 return (char *) obstack_base (&scratch_obstack);
4142 classtype_mangled_name (tree t)
4144 if (CLASSTYPE_TEMPLATE_INFO (t)
4145 /* Specializations have already had their names set up in
4146 lookup_template_class. */
4147 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t))
4149 tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t));
4151 /* For non-primary templates, the template parameters are
4152 implicit from their surrounding context. */
4153 if (PRIMARY_TEMPLATE_P (tmpl))
4155 tree name = DECL_NAME (tmpl);
4156 char *mangled_name = mangle_class_name_for_template
4157 (IDENTIFIER_POINTER (name),
4158 DECL_INNERMOST_TEMPLATE_PARMS (tmpl),
4159 CLASSTYPE_TI_ARGS (t));
4160 tree id = get_identifier (mangled_name);
4161 IDENTIFIER_TEMPLATE (id) = name;
4166 return TYPE_IDENTIFIER (t);
4170 add_pending_template (tree d)
4172 tree ti = (TYPE_P (d)
4173 ? CLASSTYPE_TEMPLATE_INFO (d)
4174 : DECL_TEMPLATE_INFO (d));
4178 if (TI_PENDING_TEMPLATE_FLAG (ti))
4181 /* We are called both from instantiate_decl, where we've already had a
4182 tinst_level pushed, and instantiate_template, where we haven't.
4184 level = !(current_tinst_level && TINST_DECL (current_tinst_level) == d);
4187 push_tinst_level (d);
4189 pt = tree_cons (current_tinst_level, d, NULL_TREE);
4190 if (last_pending_template)
4191 TREE_CHAIN (last_pending_template) = pt;
4193 pending_templates = pt;
4195 last_pending_template = pt;
4197 TI_PENDING_TEMPLATE_FLAG (ti) = 1;
4204 /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS and
4205 ARGLIST. Valid choices for FNS are given in the cp-tree.def
4206 documentation for TEMPLATE_ID_EXPR. */
4209 lookup_template_function (tree fns, tree arglist)
4213 if (fns == error_mark_node || arglist == error_mark_node)
4214 return error_mark_node;
4216 gcc_assert (!arglist || TREE_CODE (arglist) == TREE_VEC);
4217 gcc_assert (fns && (is_overloaded_fn (fns)
4218 || TREE_CODE (fns) == IDENTIFIER_NODE));
4220 if (BASELINK_P (fns))
4222 BASELINK_FUNCTIONS (fns) = build2 (TEMPLATE_ID_EXPR,
4224 BASELINK_FUNCTIONS (fns),
4229 type = TREE_TYPE (fns);
4230 if (TREE_CODE (fns) == OVERLOAD || !type)
4231 type = unknown_type_node;
4233 return build2 (TEMPLATE_ID_EXPR, type, fns, arglist);
4236 /* Within the scope of a template class S<T>, the name S gets bound
4237 (in build_self_reference) to a TYPE_DECL for the class, not a
4238 TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type,
4239 or one of its enclosing classes, and that type is a template,
4240 return the associated TEMPLATE_DECL. Otherwise, the original
4241 DECL is returned. */
4244 maybe_get_template_decl_from_type_decl (tree decl)
4246 return (decl != NULL_TREE
4247 && TREE_CODE (decl) == TYPE_DECL
4248 && DECL_ARTIFICIAL (decl)
4249 && CLASS_TYPE_P (TREE_TYPE (decl))
4250 && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
4251 ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl;
4254 /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of
4255 parameters, find the desired type.
4257 D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments.
4259 IN_DECL, if non-NULL, is the template declaration we are trying to
4262 If ENTERING_SCOPE is nonzero, we are about to enter the scope of
4263 the class we are looking up.
4265 Issue error and warning messages under control of COMPLAIN.
4267 If the template class is really a local class in a template
4268 function, then the FUNCTION_CONTEXT is the function in which it is
4271 ??? Note that this function is currently called *twice* for each
4272 template-id: the first time from the parser, while creating the
4273 incomplete type (finish_template_type), and the second type during the
4274 real instantiation (instantiate_template_class). This is surely something
4275 that we want to avoid. It also causes some problems with argument
4276 coercion (see convert_nontype_argument for more information on this). */
4279 lookup_template_class (tree d1,
4284 tsubst_flags_t complain)
4286 tree template = NULL_TREE, parmlist;
4289 timevar_push (TV_NAME_LOOKUP);
4291 if (TREE_CODE (d1) == IDENTIFIER_NODE)
4293 tree value = innermost_non_namespace_value (d1);
4294 if (value && DECL_TEMPLATE_TEMPLATE_PARM_P (value))
4299 push_decl_namespace (context);
4300 template = lookup_name (d1, /*prefer_type=*/0);
4301 template = maybe_get_template_decl_from_type_decl (template);
4303 pop_decl_namespace ();
4306 context = DECL_CONTEXT (template);
4308 else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1)))
4310 tree type = TREE_TYPE (d1);
4312 /* If we are declaring a constructor, say A<T>::A<T>, we will get
4313 an implicit typename for the second A. Deal with it. */
4314 if (TREE_CODE (type) == TYPENAME_TYPE && TREE_TYPE (type))
4315 type = TREE_TYPE (type);
4317 if (CLASSTYPE_TEMPLATE_INFO (type))
4319 template = CLASSTYPE_TI_TEMPLATE (type);
4320 d1 = DECL_NAME (template);
4323 else if (TREE_CODE (d1) == ENUMERAL_TYPE
4324 || (TYPE_P (d1) && IS_AGGR_TYPE (d1)))
4326 template = TYPE_TI_TEMPLATE (d1);
4327 d1 = DECL_NAME (template);
4329 else if (TREE_CODE (d1) == TEMPLATE_DECL
4330 && TREE_CODE (DECL_TEMPLATE_RESULT (d1)) == TYPE_DECL)
4333 d1 = DECL_NAME (template);
4334 context = DECL_CONTEXT (template);
4337 /* Issue an error message if we didn't find a template. */
4340 if (complain & tf_error)
4341 error ("%qT is not a template", d1);
4342 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4345 if (TREE_CODE (template) != TEMPLATE_DECL
4346 /* Make sure it's a user visible template, if it was named by
4348 || ((complain & tf_user) && !DECL_TEMPLATE_PARM_P (template)
4349 && !PRIMARY_TEMPLATE_P (template)))
4351 if (complain & tf_error)
4353 error ("non-template type %qT used as a template", d1);
4355 cp_error_at ("for template declaration %qD", in_decl);
4357 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4360 complain &= ~tf_user;
4362 if (DECL_TEMPLATE_TEMPLATE_PARM_P (template))
4364 /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store
4365 template arguments */
4370 parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template);
4372 /* Consider an example where a template template parameter declared as
4374 template <class T, class U = std::allocator<T> > class TT
4376 The template parameter level of T and U are one level larger than
4377 of TT. To proper process the default argument of U, say when an
4378 instantiation `TT<int>' is seen, we need to build the full
4379 arguments containing {int} as the innermost level. Outer levels,
4380 available when not appearing as default template argument, can be
4381 obtained from `current_template_args ()'.
4383 Suppose that TT is later substituted with std::vector. The above
4384 instantiation is `TT<int, std::allocator<T> >' with TT at
4385 level 1, and T at level 2, while the template arguments at level 1
4386 becomes {std::vector} and the inner level 2 is {int}. */
4388 if (current_template_parms)
4389 arglist = add_to_template_args (current_template_args (), arglist);
4391 arglist2 = coerce_template_parms (parmlist, arglist, template,
4392 complain, /*require_all_args=*/1);
4393 if (arglist2 == error_mark_node
4394 || (!uses_template_parms (arglist2)
4395 && check_instantiated_args (template, arglist2, complain)))
4396 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4398 parm = bind_template_template_parm (TREE_TYPE (template), arglist2);
4399 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, parm);
4403 tree template_type = TREE_TYPE (template);
4406 tree found = NULL_TREE;
4409 int is_partial_instantiation;
4411 gen_tmpl = most_general_template (template);
4412 parmlist = DECL_TEMPLATE_PARMS (gen_tmpl);
4413 parm_depth = TMPL_PARMS_DEPTH (parmlist);
4414 arg_depth = TMPL_ARGS_DEPTH (arglist);
4416 if (arg_depth == 1 && parm_depth > 1)
4418 /* We've been given an incomplete set of template arguments.
4421 template <class T> struct S1 {
4422 template <class U> struct S2 {};
4423 template <class U> struct S2<U*> {};
4426 we will be called with an ARGLIST of `U*', but the
4427 TEMPLATE will be `template <class T> template
4428 <class U> struct S1<T>::S2'. We must fill in the missing
4431 = add_outermost_template_args (TYPE_TI_ARGS (TREE_TYPE (template)),
4433 arg_depth = TMPL_ARGS_DEPTH (arglist);
4436 /* Now we should have enough arguments. */
4437 gcc_assert (parm_depth == arg_depth);
4439 /* From here on, we're only interested in the most general
4441 template = gen_tmpl;
4443 /* Calculate the BOUND_ARGS. These will be the args that are
4444 actually tsubst'd into the definition to create the
4448 /* We have multiple levels of arguments to coerce, at once. */
4450 int saved_depth = TMPL_ARGS_DEPTH (arglist);
4452 tree bound_args = make_tree_vec (parm_depth);
4454 for (i = saved_depth,
4455 t = DECL_TEMPLATE_PARMS (template);
4456 i > 0 && t != NULL_TREE;
4457 --i, t = TREE_CHAIN (t))
4459 tree a = coerce_template_parms (TREE_VALUE (t),
4461 complain, /*require_all_args=*/1);
4463 /* Don't process further if one of the levels fails. */
4464 if (a == error_mark_node)
4466 /* Restore the ARGLIST to its full size. */
4467 TREE_VEC_LENGTH (arglist) = saved_depth;
4468 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4471 SET_TMPL_ARGS_LEVEL (bound_args, i, a);
4473 /* We temporarily reduce the length of the ARGLIST so
4474 that coerce_template_parms will see only the arguments
4475 corresponding to the template parameters it is
4477 TREE_VEC_LENGTH (arglist)--;
4480 /* Restore the ARGLIST to its full size. */
4481 TREE_VEC_LENGTH (arglist) = saved_depth;
4483 arglist = bound_args;
4487 = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist),
4488 INNERMOST_TEMPLATE_ARGS (arglist),
4490 complain, /*require_all_args=*/1);
4492 if (arglist == error_mark_node)
4493 /* We were unable to bind the arguments. */
4494 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4496 /* In the scope of a template class, explicit references to the
4497 template class refer to the type of the template, not any
4498 instantiation of it. For example, in:
4500 template <class T> class C { void f(C<T>); }
4502 the `C<T>' is just the same as `C'. Outside of the
4503 class, however, such a reference is an instantiation. */
4504 if (comp_template_args (TYPE_TI_ARGS (template_type),
4507 found = template_type;
4509 if (!entering_scope && PRIMARY_TEMPLATE_P (template))
4513 for (ctx = current_class_type;
4514 ctx && TREE_CODE (ctx) != NAMESPACE_DECL;
4516 ? TYPE_CONTEXT (ctx)
4517 : DECL_CONTEXT (ctx)))
4518 if (TYPE_P (ctx) && same_type_p (ctx, template_type))
4521 /* We're not in the scope of the class, so the
4522 TEMPLATE_TYPE is not the type we want after all. */
4528 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found);
4530 /* If we already have this specialization, return it. */
4531 found = retrieve_specialization (template, arglist,
4532 /*class_specializations_p=*/false);
4534 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found);
4536 /* This type is a "partial instantiation" if any of the template
4537 arguments still involve template parameters. Note that we set
4538 IS_PARTIAL_INSTANTIATION for partial specializations as
4540 is_partial_instantiation = uses_template_parms (arglist);
4542 /* If the deduced arguments are invalid, then the binding
4544 if (!is_partial_instantiation
4545 && check_instantiated_args (template,
4546 INNERMOST_TEMPLATE_ARGS (arglist),
4548 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4550 if (!is_partial_instantiation
4551 && !PRIMARY_TEMPLATE_P (template)
4552 && TREE_CODE (CP_DECL_CONTEXT (template)) == NAMESPACE_DECL)
4554 found = xref_tag_from_type (TREE_TYPE (template),
4555 DECL_NAME (template),
4556 /*tag_scope=*/ts_global);
4557 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found);
4560 context = tsubst (DECL_CONTEXT (template), arglist,
4563 context = global_namespace;
4565 /* Create the type. */
4566 if (TREE_CODE (template_type) == ENUMERAL_TYPE)
4568 if (!is_partial_instantiation)
4570 set_current_access_from_decl (TYPE_NAME (template_type));
4571 t = start_enum (TYPE_IDENTIFIER (template_type));
4574 /* We don't want to call start_enum for this type, since
4575 the values for the enumeration constants may involve
4576 template parameters. And, no one should be interested
4577 in the enumeration constants for such a type. */
4578 t = make_node (ENUMERAL_TYPE);
4582 t = make_aggr_type (TREE_CODE (template_type));
4583 CLASSTYPE_DECLARED_CLASS (t)
4584 = CLASSTYPE_DECLARED_CLASS (template_type);
4585 SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t);
4586 TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type);
4588 /* A local class. Make sure the decl gets registered properly. */
4589 if (context == current_function_decl)
4590 pushtag (DECL_NAME (template), t, /*tag_scope=*/ts_current);
4593 /* If we called start_enum or pushtag above, this information
4594 will already be set up. */
4597 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
4599 type_decl = create_implicit_typedef (DECL_NAME (template), t);
4600 DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t);
4601 TYPE_STUB_DECL (t) = type_decl;
4602 DECL_SOURCE_LOCATION (type_decl)
4603 = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (template_type));
4606 type_decl = TYPE_NAME (t);
4608 TREE_PRIVATE (type_decl)
4609 = TREE_PRIVATE (TYPE_STUB_DECL (template_type));
4610 TREE_PROTECTED (type_decl)
4611 = TREE_PROTECTED (TYPE_STUB_DECL (template_type));
4612 DECL_IN_SYSTEM_HEADER (type_decl)
4613 = DECL_IN_SYSTEM_HEADER (template);
4615 /* Set up the template information. We have to figure out which
4616 template is the immediate parent if this is a full
4618 if (parm_depth == 1 || is_partial_instantiation
4619 || !PRIMARY_TEMPLATE_P (template))
4620 /* This case is easy; there are no member templates involved. */
4624 /* This is a full instantiation of a member template. Look
4625 for a partial instantiation of which this is an instance. */
4627 for (found = DECL_TEMPLATE_INSTANTIATIONS (template);
4628 found; found = TREE_CHAIN (found))
4631 tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found));
4633 /* We only want partial instantiations, here, not
4634 specializations or full instantiations. */
4635 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found))
4636 || !uses_template_parms (TREE_VALUE (found)))
4639 /* Temporarily reduce by one the number of levels in the
4640 ARGLIST and in FOUND so as to avoid comparing the
4641 last set of arguments. */
4642 TREE_VEC_LENGTH (arglist)--;
4643 TREE_VEC_LENGTH (TREE_PURPOSE (found)) --;
4645 /* See if the arguments match. If they do, then TMPL is
4646 the partial instantiation we want. */
4647 success = comp_template_args (TREE_PURPOSE (found), arglist);
4649 /* Restore the argument vectors to their full size. */
4650 TREE_VEC_LENGTH (arglist)++;
4651 TREE_VEC_LENGTH (TREE_PURPOSE (found))++;
4662 /* There was no partial instantiation. This happens
4663 where C<T> is a member template of A<T> and it's used
4666 template <typename T> struct B { A<T>::C<int> m; };
4669 Create the partial instantiation.
4671 TREE_VEC_LENGTH (arglist)--;
4672 found = tsubst (template, arglist, complain, NULL_TREE);
4673 TREE_VEC_LENGTH (arglist)++;
4677 SET_TYPE_TEMPLATE_INFO (t, tree_cons (found, arglist, NULL_TREE));
4678 DECL_TEMPLATE_INSTANTIATIONS (template)
4679 = tree_cons (arglist, t,
4680 DECL_TEMPLATE_INSTANTIATIONS (template));
4682 if (TREE_CODE (t) == ENUMERAL_TYPE
4683 && !is_partial_instantiation)
4684 /* Now that the type has been registered on the instantiations
4685 list, we set up the enumerators. Because the enumeration
4686 constants may involve the enumeration type itself, we make
4687 sure to register the type first, and then create the
4688 constants. That way, doing tsubst_expr for the enumeration
4689 constants won't result in recursive calls here; we'll find
4690 the instantiation and exit above. */
4691 tsubst_enum (template_type, t, arglist);
4693 /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO
4695 if (TREE_CODE (t) != ENUMERAL_TYPE)
4696 DECL_NAME (type_decl) = classtype_mangled_name (t);
4697 if (is_partial_instantiation)
4698 /* If the type makes use of template parameters, the
4699 code that generates debugging information will crash. */
4700 DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1;
4702 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
4704 timevar_pop (TV_NAME_LOOKUP);
4711 struct pointer_set_t *visited;
4714 /* Called from for_each_template_parm via walk_tree. */
4717 for_each_template_parm_r (tree *tp, int *walk_subtrees, void *d)
4720 struct pair_fn_data *pfd = (struct pair_fn_data *) d;
4721 tree_fn_t fn = pfd->fn;
4722 void *data = pfd->data;
4725 && for_each_template_parm (TYPE_CONTEXT (t), fn, data, pfd->visited))
4726 return error_mark_node;
4728 switch (TREE_CODE (t))
4731 if (TYPE_PTRMEMFUNC_P (t))
4737 if (!TYPE_TEMPLATE_INFO (t))
4739 else if (for_each_template_parm (TREE_VALUE (TYPE_TEMPLATE_INFO (t)),
4740 fn, data, pfd->visited))
4741 return error_mark_node;
4745 /* Since we're not going to walk subtrees, we have to do this
4747 if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data,
4749 return error_mark_node;
4753 /* Check the return type. */
4754 if (for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited))
4755 return error_mark_node;
4757 /* Check the parameter types. Since default arguments are not
4758 instantiated until they are needed, the TYPE_ARG_TYPES may
4759 contain expressions that involve template parameters. But,
4760 no-one should be looking at them yet. And, once they're
4761 instantiated, they don't contain template parameters, so
4762 there's no point in looking at them then, either. */
4766 for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm))
4767 if (for_each_template_parm (TREE_VALUE (parm), fn, data,
4769 return error_mark_node;
4771 /* Since we've already handled the TYPE_ARG_TYPES, we don't
4772 want walk_tree walking into them itself. */
4778 if (for_each_template_parm (TYPE_FIELDS (t), fn, data,
4780 return error_mark_node;
4785 if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)
4786 && for_each_template_parm (DECL_TI_ARGS (t), fn, data,
4788 return error_mark_node;
4793 if (TREE_CODE (t) == CONST_DECL && DECL_TEMPLATE_PARM_P (t)
4794 && for_each_template_parm (DECL_INITIAL (t), fn, data,
4796 return error_mark_node;
4797 if (DECL_CONTEXT (t)
4798 && for_each_template_parm (DECL_CONTEXT (t), fn, data,
4800 return error_mark_node;
4803 case BOUND_TEMPLATE_TEMPLATE_PARM:
4804 /* Record template parameters such as `T' inside `TT<T>'. */
4805 if (for_each_template_parm (TYPE_TI_ARGS (t), fn, data, pfd->visited))
4806 return error_mark_node;
4809 case TEMPLATE_TEMPLATE_PARM:
4810 case TEMPLATE_TYPE_PARM:
4811 case TEMPLATE_PARM_INDEX:
4812 if (fn && (*fn)(t, data))
4813 return error_mark_node;
4815 return error_mark_node;
4819 /* A template template parameter is encountered. */
4820 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t)
4821 && for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited))
4822 return error_mark_node;
4824 /* Already substituted template template parameter */
4830 || for_each_template_parm (TYPENAME_TYPE_FULLNAME (t), fn,
4831 data, pfd->visited))
4832 return error_mark_node;
4836 if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t))
4837 && for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE
4838 (TREE_TYPE (t)), fn, data,
4840 return error_mark_node;
4845 /* If there's no type, then this thing must be some expression
4846 involving template parameters. */
4847 if (!fn && !TREE_TYPE (t))
4848 return error_mark_node;
4853 case REINTERPRET_CAST_EXPR:
4854 case CONST_CAST_EXPR:
4855 case STATIC_CAST_EXPR:
4856 case DYNAMIC_CAST_EXPR:
4860 case PSEUDO_DTOR_EXPR:
4862 return error_mark_node;
4866 /* If we do not handle this case specially, we end up walking
4867 the BINFO hierarchy, which is circular, and therefore
4868 confuses walk_tree. */
4870 if (for_each_template_parm (BASELINK_FUNCTIONS (*tp), fn, data,
4872 return error_mark_node;
4879 /* We didn't find any template parameters we liked. */
4883 /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM,
4884 BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T,
4885 call FN with the parameter and the DATA.
4886 If FN returns nonzero, the iteration is terminated, and
4887 for_each_template_parm returns 1. Otherwise, the iteration
4888 continues. If FN never returns a nonzero value, the value
4889 returned by for_each_template_parm is 0. If FN is NULL, it is
4890 considered to be the function which always returns 1. */
4893 for_each_template_parm (tree t, tree_fn_t fn, void* data,
4894 struct pointer_set_t *visited)
4896 struct pair_fn_data pfd;
4903 /* Walk the tree. (Conceptually, we would like to walk without
4904 duplicates, but for_each_template_parm_r recursively calls
4905 for_each_template_parm, so we would need to reorganize a fair
4906 bit to use walk_tree_without_duplicates, so we keep our own
4909 pfd.visited = visited;
4911 pfd.visited = pointer_set_create ();
4912 result = walk_tree (&t,
4913 for_each_template_parm_r,
4915 pfd.visited) != NULL_TREE;
4920 pointer_set_destroy (pfd.visited);
4927 /* Returns true if T depends on any template parameter. */
4930 uses_template_parms (tree t)
4933 int saved_processing_template_decl;
4935 saved_processing_template_decl = processing_template_decl;
4936 if (!saved_processing_template_decl)
4937 processing_template_decl = 1;
4939 dependent_p = dependent_type_p (t);
4940 else if (TREE_CODE (t) == TREE_VEC)
4941 dependent_p = any_dependent_template_arguments_p (t);
4942 else if (TREE_CODE (t) == TREE_LIST)
4943 dependent_p = (uses_template_parms (TREE_VALUE (t))
4944 || uses_template_parms (TREE_CHAIN (t)));
4947 || TREE_CODE (t) == TEMPLATE_PARM_INDEX
4948 || TREE_CODE (t) == OVERLOAD
4949 || TREE_CODE (t) == BASELINK
4950 || CONSTANT_CLASS_P (t))
4951 dependent_p = (type_dependent_expression_p (t)
4952 || value_dependent_expression_p (t));
4955 gcc_assert (t == error_mark_node);
4956 dependent_p = false;
4959 processing_template_decl = saved_processing_template_decl;
4964 /* Returns true if T depends on any template parameter with level LEVEL. */
4967 uses_template_parms_level (tree t, int level)
4969 return for_each_template_parm (t, template_parm_this_level_p, &level, NULL);
4972 static int tinst_depth;
4973 extern int max_tinst_depth;
4974 #ifdef GATHER_STATISTICS
4977 static int tinst_level_tick;
4978 static int last_template_error_tick;
4980 /* We're starting to instantiate D; record the template instantiation context
4981 for diagnostics and to restore it later. */
4984 push_tinst_level (tree d)
4988 if (tinst_depth >= max_tinst_depth)
4990 /* If the instantiation in question still has unbound template parms,
4991 we don't really care if we can't instantiate it, so just return.
4992 This happens with base instantiation for implicit `typename'. */
4993 if (uses_template_parms (d))
4996 last_template_error_tick = tinst_level_tick;
4997 error ("template instantiation depth exceeds maximum of %d (use "
4998 "-ftemplate-depth-NN to increase the maximum) instantiating %qD",
4999 max_tinst_depth, d);
5001 print_instantiation_context ();
5006 new = make_node (TINST_LEVEL);
5007 TINST_DECL (new) = d;
5008 TINST_LOCATION (new) = input_location;
5009 TINST_IN_SYSTEM_HEADER_P (new) = in_system_header;
5010 TREE_CHAIN (new) = current_tinst_level;
5011 current_tinst_level = new;
5014 #ifdef GATHER_STATISTICS
5015 if (tinst_depth > depth_reached)
5016 depth_reached = tinst_depth;
5023 /* We're done instantiating this template; return to the instantiation
5027 pop_tinst_level (void)
5029 tree old = current_tinst_level;
5031 /* Restore the filename and line number stashed away when we started
5032 this instantiation. */
5033 input_location = TINST_LOCATION (old);
5034 in_system_header = TINST_IN_SYSTEM_HEADER_P (old);
5035 current_tinst_level = TREE_CHAIN (old);
5040 /* We're instantiating a deferred template; restore the template
5041 instantiation context in which the instantiation was requested, which
5042 is one step out from LEVEL. */
5045 reopen_tinst_level (tree level)
5050 for (t = level; t; t = TREE_CHAIN (t))
5053 current_tinst_level = level;
5057 /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the
5058 vector of template arguments, as for tsubst.
5060 Returns an appropriate tsubst'd friend declaration. */
5063 tsubst_friend_function (tree decl, tree args)
5067 if (TREE_CODE (decl) == FUNCTION_DECL
5068 && DECL_TEMPLATE_INSTANTIATION (decl)
5069 && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL)
5070 /* This was a friend declared with an explicit template
5071 argument list, e.g.:
5075 to indicate that f was a template instantiation, not a new
5076 function declaration. Now, we have to figure out what
5077 instantiation of what template. */
5079 tree template_id, arglist, fns;
5082 tree ns = decl_namespace_context (TYPE_MAIN_DECL (current_class_type));
5084 /* Friend functions are looked up in the containing namespace scope.
5085 We must enter that scope, to avoid finding member functions of the
5086 current cless with same name. */
5087 push_nested_namespace (ns);
5088 fns = tsubst_expr (DECL_TI_TEMPLATE (decl), args,
5089 tf_error | tf_warning, NULL_TREE);
5090 pop_nested_namespace (ns);
5091 arglist = tsubst (DECL_TI_ARGS (decl), args,
5092 tf_error | tf_warning, NULL_TREE);
5093 template_id = lookup_template_function (fns, arglist);
5095 new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE);
5096 tmpl = determine_specialization (template_id, new_friend,
5098 /*need_member_template=*/0,
5099 TREE_VEC_LENGTH (args));
5100 return instantiate_template (tmpl, new_args, tf_error);
5103 new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE);
5105 /* The NEW_FRIEND will look like an instantiation, to the
5106 compiler, but is not an instantiation from the point of view of
5107 the language. For example, we might have had:
5109 template <class T> struct S {
5110 template <class U> friend void f(T, U);
5113 Then, in S<int>, template <class U> void f(int, U) is not an
5114 instantiation of anything. */
5115 if (new_friend == error_mark_node)
5116 return error_mark_node;
5118 DECL_USE_TEMPLATE (new_friend) = 0;
5119 if (TREE_CODE (decl) == TEMPLATE_DECL)
5121 DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0;
5122 DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend))
5123 = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl));
5126 /* The mangled name for the NEW_FRIEND is incorrect. The function
5127 is not a template instantiation and should not be mangled like
5128 one. Therefore, we forget the mangling here; we'll recompute it
5129 later if we need it. */
5130 if (TREE_CODE (new_friend) != TEMPLATE_DECL)
5132 SET_DECL_RTL (new_friend, NULL_RTX);
5133 SET_DECL_ASSEMBLER_NAME (new_friend, NULL_TREE);
5136 if (DECL_NAMESPACE_SCOPE_P (new_friend))
5139 tree new_friend_template_info;
5140 tree new_friend_result_template_info;
5142 int new_friend_is_defn;
5144 /* We must save some information from NEW_FRIEND before calling
5145 duplicate decls since that function will free NEW_FRIEND if
5147 new_friend_template_info = DECL_TEMPLATE_INFO (new_friend);
5148 new_friend_is_defn =
5149 (DECL_INITIAL (DECL_TEMPLATE_RESULT
5150 (template_for_substitution (new_friend)))
5152 if (TREE_CODE (new_friend) == TEMPLATE_DECL)
5154 /* This declaration is a `primary' template. */
5155 DECL_PRIMARY_TEMPLATE (new_friend) = new_friend;
5157 new_friend_result_template_info
5158 = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend));
5161 new_friend_result_template_info = NULL_TREE;
5163 /* Inside pushdecl_namespace_level, we will push into the
5164 current namespace. However, the friend function should go
5165 into the namespace of the template. */
5166 ns = decl_namespace_context (new_friend);
5167 push_nested_namespace (ns);
5168 old_decl = pushdecl_namespace_level (new_friend);
5169 pop_nested_namespace (ns);
5171 if (old_decl != new_friend)
5173 /* This new friend declaration matched an existing
5174 declaration. For example, given:
5176 template <class T> void f(T);
5177 template <class U> class C {
5178 template <class T> friend void f(T) {}
5181 the friend declaration actually provides the definition
5182 of `f', once C has been instantiated for some type. So,
5183 old_decl will be the out-of-class template declaration,
5184 while new_friend is the in-class definition.
5186 But, if `f' was called before this point, the
5187 instantiation of `f' will have DECL_TI_ARGS corresponding
5188 to `T' but not to `U', references to which might appear
5189 in the definition of `f'. Previously, the most general
5190 template for an instantiation of `f' was the out-of-class
5191 version; now it is the in-class version. Therefore, we
5192 run through all specialization of `f', adding to their
5193 DECL_TI_ARGS appropriately. In particular, they need a
5194 new set of outer arguments, corresponding to the
5195 arguments for this class instantiation.
5197 The same situation can arise with something like this:
5200 template <class T> class C {
5204 when `C<int>' is instantiated. Now, `f(int)' is defined
5207 if (!new_friend_is_defn)
5208 /* On the other hand, if the in-class declaration does
5209 *not* provide a definition, then we don't want to alter
5210 existing definitions. We can just leave everything
5215 /* Overwrite whatever template info was there before, if
5216 any, with the new template information pertaining to
5218 DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info;
5220 if (TREE_CODE (old_decl) != TEMPLATE_DECL)
5221 reregister_specialization (new_friend,
5222 most_general_template (old_decl),
5227 tree new_friend_args;
5229 DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl))
5230 = new_friend_result_template_info;
5232 new_friend_args = TI_ARGS (new_friend_template_info);
5233 for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl);
5237 tree spec = TREE_VALUE (t);
5240 = add_outermost_template_args (new_friend_args,
5241 DECL_TI_ARGS (spec));
5244 /* Now, since specializations are always supposed to
5245 hang off of the most general template, we must move
5247 t = most_general_template (old_decl);
5250 DECL_TEMPLATE_SPECIALIZATIONS (t)
5251 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t),
5252 DECL_TEMPLATE_SPECIALIZATIONS (old_decl));
5253 DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE;
5258 /* The information from NEW_FRIEND has been merged into OLD_DECL
5259 by duplicate_decls. */
5260 new_friend = old_decl;
5265 tree context = DECL_CONTEXT (new_friend);
5269 template <class T> class C {
5270 template <class U> friend void C1<U>::f (); // case 1
5271 friend void C2<T>::f (); // case 2
5273 we only need to make sure CONTEXT is a complete type for
5274 case 2. To distinguish between the two cases, we note that
5275 CONTEXT of case 1 remains dependent type after tsubst while
5276 this isn't true for case 2. */
5277 ++processing_template_decl;
5278 dependent_p = dependent_type_p (context);
5279 --processing_template_decl;
5282 && !complete_type_or_else (context, NULL_TREE))
5283 return error_mark_node;
5285 if (COMPLETE_TYPE_P (context))
5287 /* Check to see that the declaration is really present, and,
5288 possibly obtain an improved declaration. */
5289 tree fn = check_classfn (context,
5290 new_friend, NULL_TREE);
5300 /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of
5301 template arguments, as for tsubst.
5303 Returns an appropriate tsubst'd friend type or error_mark_node on
5307 tsubst_friend_class (tree friend_tmpl, tree args)
5313 context = DECL_CONTEXT (friend_tmpl);
5317 if (TREE_CODE (context) == NAMESPACE_DECL)
5318 push_nested_namespace (context);
5320 push_nested_class (tsubst (context, args, tf_none, NULL_TREE));
5323 /* First, we look for a class template. */
5324 tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/0);
5326 /* But, if we don't find one, it might be because we're in a
5327 situation like this:
5335 Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL
5336 for `S<int>', not the TEMPLATE_DECL. */
5337 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
5339 tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/1);
5340 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
5343 if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl))
5345 /* The friend template has already been declared. Just
5346 check to see that the declarations match, and install any new
5347 default parameters. We must tsubst the default parameters,
5348 of course. We only need the innermost template parameters
5349 because that is all that redeclare_class_template will look
5351 if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl))
5352 > TMPL_ARGS_DEPTH (args))
5355 parms = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl),
5356 args, tf_error | tf_warning);
5357 redeclare_class_template (TREE_TYPE (tmpl), parms);
5360 friend_type = TREE_TYPE (tmpl);
5364 /* The friend template has not already been declared. In this
5365 case, the instantiation of the template class will cause the
5366 injection of this template into the global scope. */
5367 tmpl = tsubst (friend_tmpl, args, tf_error | tf_warning, NULL_TREE);
5369 /* The new TMPL is not an instantiation of anything, so we
5370 forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for
5371 the new type because that is supposed to be the corresponding
5372 template decl, i.e., TMPL. */
5373 DECL_USE_TEMPLATE (tmpl) = 0;
5374 DECL_TEMPLATE_INFO (tmpl) = NULL_TREE;
5375 CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0;
5376 CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl))
5377 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl)));
5379 /* Inject this template into the global scope. */
5380 friend_type = TREE_TYPE (pushdecl_top_level (tmpl));
5385 if (TREE_CODE (context) == NAMESPACE_DECL)
5386 pop_nested_namespace (context);
5388 pop_nested_class ();
5394 /* Returns zero if TYPE cannot be completed later due to circularity.
5395 Otherwise returns one. */
5398 can_complete_type_without_circularity (tree type)
5400 if (type == NULL_TREE || type == error_mark_node)
5402 else if (COMPLETE_TYPE_P (type))
5404 else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type))
5405 return can_complete_type_without_circularity (TREE_TYPE (type));
5406 else if (CLASS_TYPE_P (type)
5407 && TYPE_BEING_DEFINED (TYPE_MAIN_VARIANT (type)))
5414 instantiate_class_template (tree type)
5416 tree template, args, pattern, t, member;
5421 if (type == error_mark_node)
5422 return error_mark_node;
5424 if (TYPE_BEING_DEFINED (type)
5425 || COMPLETE_TYPE_P (type)
5426 || dependent_type_p (type))
5429 /* Figure out which template is being instantiated. */
5430 template = most_general_template (CLASSTYPE_TI_TEMPLATE (type));
5431 gcc_assert (TREE_CODE (template) == TEMPLATE_DECL);
5433 /* Figure out which arguments are being used to do the
5435 args = CLASSTYPE_TI_ARGS (type);
5437 /* Determine what specialization of the original template to
5439 t = most_specialized_class (template, args);
5440 if (t == error_mark_node)
5442 const char *str = "candidates are:";
5443 error ("ambiguous class template instantiation for %q#T", type);
5444 for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t;
5447 if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args))
5449 cp_error_at ("%s %+#T", str, TREE_TYPE (t));
5453 TYPE_BEING_DEFINED (type) = 1;
5454 return error_mark_node;
5458 pattern = TREE_TYPE (t);
5460 pattern = TREE_TYPE (template);
5462 /* If the template we're instantiating is incomplete, then clearly
5463 there's nothing we can do. */
5464 if (!COMPLETE_TYPE_P (pattern))
5467 /* If we've recursively instantiated too many templates, stop. */
5468 if (! push_tinst_level (type))
5471 /* Now we're really doing the instantiation. Mark the type as in
5472 the process of being defined. */
5473 TYPE_BEING_DEFINED (type) = 1;
5475 /* We may be in the middle of deferred access check. Disable
5477 push_deferring_access_checks (dk_no_deferred);
5479 push_to_top_level ();
5483 /* This TYPE is actually an instantiation of a partial
5484 specialization. We replace the innermost set of ARGS with
5485 the arguments appropriate for substitution. For example,
5488 template <class T> struct S {};
5489 template <class T> struct S<T*> {};
5491 and supposing that we are instantiating S<int*>, ARGS will
5492 present be {int*} but we need {int}. */
5494 = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t),
5497 /* If there were multiple levels in ARGS, replacing the
5498 innermost level would alter CLASSTYPE_TI_ARGS, which we don't
5499 want, so we make a copy first. */
5500 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args))
5502 args = copy_node (args);
5503 SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args);
5509 SET_CLASSTYPE_INTERFACE_UNKNOWN (type);
5511 /* Set the input location to the template definition. This is needed
5512 if tsubsting causes an error. */
5513 typedecl = TYPE_MAIN_DECL (type);
5514 input_location = DECL_SOURCE_LOCATION (typedecl);
5515 in_system_header = DECL_IN_SYSTEM_HEADER (typedecl);
5517 TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern);
5518 TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern);
5519 TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern);
5520 TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern);
5521 TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern);
5522 TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern);
5523 TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern);
5524 TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern);
5525 TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern);
5526 TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern);
5527 TYPE_PACKED (type) = TYPE_PACKED (pattern);
5528 TYPE_ALIGN (type) = TYPE_ALIGN (pattern);
5529 TYPE_USER_ALIGN (type) = TYPE_USER_ALIGN (pattern);
5530 TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */
5531 if (ANON_AGGR_TYPE_P (pattern))
5532 SET_ANON_AGGR_TYPE_P (type);
5534 pbinfo = TYPE_BINFO (pattern);
5536 /* We should never instantiate a nested class before its enclosing
5537 class; we need to look up the nested class by name before we can
5538 instantiate it, and that lookup should instantiate the enclosing
5540 gcc_assert (!DECL_CLASS_SCOPE_P (TYPE_MAIN_DECL (pattern))
5541 || COMPLETE_TYPE_P (TYPE_CONTEXT (type))
5542 || TYPE_BEING_DEFINED (TYPE_CONTEXT (type)));
5544 base_list = NULL_TREE;
5545 if (BINFO_N_BASE_BINFOS (pbinfo))
5548 tree context = TYPE_CONTEXT (type);
5552 /* We must enter the scope containing the type, as that is where
5553 the accessibility of types named in dependent bases are
5555 pushed_scope = push_scope (context ? context : global_namespace);
5557 /* Substitute into each of the bases to determine the actual
5559 for (i = 0; BINFO_BASE_ITERATE (pbinfo, i, pbase_binfo); i++)
5562 tree access = BINFO_BASE_ACCESS (pbinfo, i);
5564 /* Substitute to figure out the base class. */
5565 base = tsubst (BINFO_TYPE (pbase_binfo), args, tf_error, NULL_TREE);
5566 if (base == error_mark_node)
5569 base_list = tree_cons (access, base, base_list);
5570 if (BINFO_VIRTUAL_P (pbase_binfo))
5571 TREE_TYPE (base_list) = integer_type_node;
5574 /* The list is now in reverse order; correct that. */
5575 base_list = nreverse (base_list);
5578 pop_scope (pushed_scope);
5580 /* Now call xref_basetypes to set up all the base-class
5582 xref_basetypes (type, base_list);
5585 /* Now that our base classes are set up, enter the scope of the
5586 class, so that name lookups into base classes, etc. will work
5587 correctly. This is precisely analogous to what we do in
5588 begin_class_definition when defining an ordinary non-template
5592 /* Now members are processed in the order of declaration. */
5593 for (member = CLASSTYPE_DECL_LIST (pattern);
5594 member; member = TREE_CHAIN (member))
5596 tree t = TREE_VALUE (member);
5598 if (TREE_PURPOSE (member))
5602 /* Build new CLASSTYPE_NESTED_UTDS. */
5605 tree name = TYPE_IDENTIFIER (tag);
5607 bool class_template_p;
5609 class_template_p = (TREE_CODE (tag) != ENUMERAL_TYPE
5610 && TYPE_LANG_SPECIFIC (tag)
5611 && CLASSTYPE_IS_TEMPLATE (tag));
5612 /* If the member is a class template, then -- even after
5613 substitution -- there may be dependent types in the
5614 template argument list for the class. We increment
5615 PROCESSING_TEMPLATE_DECL so that dependent_type_p, as
5616 that function will assume that no types are dependent
5617 when outside of a template. */
5618 if (class_template_p)
5619 ++processing_template_decl;
5620 newtag = tsubst (tag, args, tf_error, NULL_TREE);
5621 if (class_template_p)
5622 --processing_template_decl;
5623 if (newtag == error_mark_node)
5626 if (TREE_CODE (newtag) != ENUMERAL_TYPE)
5628 if (class_template_p)
5629 /* Unfortunately, lookup_template_class sets
5630 CLASSTYPE_IMPLICIT_INSTANTIATION for a partial
5631 instantiation (i.e., for the type of a member
5632 template class nested within a template class.)
5633 This behavior is required for
5634 maybe_process_partial_specialization to work
5635 correctly, but is not accurate in this case;
5636 the TAG is not an instantiation of anything.
5637 (The corresponding TEMPLATE_DECL is an
5638 instantiation, but the TYPE is not.) */
5639 CLASSTYPE_USE_TEMPLATE (newtag) = 0;
5641 /* Now, we call pushtag to put this NEWTAG into the scope of
5642 TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid
5643 pushtag calling push_template_decl. We don't have to do
5644 this for enums because it will already have been done in
5647 SET_IDENTIFIER_TYPE_VALUE (name, newtag);
5648 pushtag (name, newtag, /*tag_scope=*/ts_current);
5651 else if (TREE_CODE (t) == FUNCTION_DECL
5652 || DECL_FUNCTION_TEMPLATE_P (t))
5654 /* Build new TYPE_METHODS. */
5657 if (TREE_CODE (t) == TEMPLATE_DECL)
5658 ++processing_template_decl;
5659 r = tsubst (t, args, tf_error, NULL_TREE);
5660 if (TREE_CODE (t) == TEMPLATE_DECL)
5661 --processing_template_decl;
5662 set_current_access_from_decl (r);
5663 grok_special_member_properties (r);
5664 finish_member_declaration (r);
5668 /* Build new TYPE_FIELDS. */
5670 if (TREE_CODE (t) != CONST_DECL)
5674 /* The the file and line for this declaration, to
5675 assist in error message reporting. Since we
5676 called push_tinst_level above, we don't need to
5678 input_location = DECL_SOURCE_LOCATION (t);
5680 if (TREE_CODE (t) == TEMPLATE_DECL)
5681 ++processing_template_decl;
5682 r = tsubst (t, args, tf_error | tf_warning, NULL_TREE);
5683 if (TREE_CODE (t) == TEMPLATE_DECL)
5684 --processing_template_decl;
5685 if (TREE_CODE (r) == VAR_DECL)
5689 if (DECL_INITIALIZED_IN_CLASS_P (r))
5690 init = tsubst_expr (DECL_INITIAL (t), args,
5691 tf_error | tf_warning, NULL_TREE);
5695 finish_static_data_member_decl
5696 (r, init, /*asmspec_tree=*/NULL_TREE, /*flags=*/0);
5698 if (DECL_INITIALIZED_IN_CLASS_P (r))
5699 check_static_variable_definition (r, TREE_TYPE (r));
5701 else if (TREE_CODE (r) == FIELD_DECL)
5703 /* Determine whether R has a valid type and can be
5704 completed later. If R is invalid, then it is
5705 replaced by error_mark_node so that it will not be
5706 added to TYPE_FIELDS. */
5707 tree rtype = TREE_TYPE (r);
5708 if (can_complete_type_without_circularity (rtype))
5709 complete_type (rtype);
5711 if (!COMPLETE_TYPE_P (rtype))
5713 cxx_incomplete_type_error (r, rtype);
5714 r = error_mark_node;
5718 /* If it is a TYPE_DECL for a class-scoped ENUMERAL_TYPE,
5719 such a thing will already have been added to the field
5720 list by tsubst_enum in finish_member_declaration in the
5721 CLASSTYPE_NESTED_UTDS case above. */
5722 if (!(TREE_CODE (r) == TYPE_DECL
5723 && TREE_CODE (TREE_TYPE (r)) == ENUMERAL_TYPE
5724 && DECL_ARTIFICIAL (r)))
5726 set_current_access_from_decl (r);
5727 finish_member_declaration (r);
5734 if (TYPE_P (t) || DECL_CLASS_TEMPLATE_P (t))
5736 /* Build new CLASSTYPE_FRIEND_CLASSES. */
5738 tree friend_type = t;
5739 bool adjust_processing_template_decl = false;
5741 if (TREE_CODE (friend_type) == TEMPLATE_DECL)
5743 /* template <class T> friend class C; */
5744 friend_type = tsubst_friend_class (friend_type, args);
5745 adjust_processing_template_decl = true;
5747 else if (TREE_CODE (friend_type) == UNBOUND_CLASS_TEMPLATE)
5749 /* template <class T> friend class C::D; */
5750 friend_type = tsubst (friend_type, args,
5751 tf_error | tf_warning, NULL_TREE);
5752 if (TREE_CODE (friend_type) == TEMPLATE_DECL)
5753 friend_type = TREE_TYPE (friend_type);
5754 adjust_processing_template_decl = true;
5756 else if (TREE_CODE (friend_type) == TYPENAME_TYPE)
5758 /* This could be either
5762 when dependent_type_p is false or
5764 template <class U> friend class T::C;
5767 friend_type = tsubst (friend_type, args,
5768 tf_error | tf_warning, NULL_TREE);
5769 /* Bump processing_template_decl for correct
5770 dependent_type_p calculation. */
5771 ++processing_template_decl;
5772 if (dependent_type_p (friend_type))
5773 adjust_processing_template_decl = true;
5774 --processing_template_decl;
5776 else if (!CLASSTYPE_USE_TEMPLATE (friend_type)
5777 && hidden_name_p (TYPE_NAME (friend_type)))
5781 where C hasn't been declared yet. Let's lookup name
5782 from namespace scope directly, bypassing any name that
5783 come from dependent base class. */
5784 tree ns = decl_namespace_context (TYPE_MAIN_DECL (friend_type));
5786 /* The call to xref_tag_from_type does injection for friend
5788 push_nested_namespace (ns);
5790 xref_tag_from_type (friend_type, NULL_TREE,
5791 /*tag_scope=*/ts_current);
5792 pop_nested_namespace (ns);
5794 else if (uses_template_parms (friend_type))
5795 /* friend class C<T>; */
5796 friend_type = tsubst (friend_type, args,
5797 tf_error | tf_warning, NULL_TREE);
5802 where C is already declared or
5804 friend class C<int>;
5806 We don't have to do anything in these cases. */
5808 if (adjust_processing_template_decl)
5809 /* Trick make_friend_class into realizing that the friend
5810 we're adding is a template, not an ordinary class. It's
5811 important that we use make_friend_class since it will
5812 perform some error-checking and output cross-reference
5814 ++processing_template_decl;
5816 if (friend_type != error_mark_node)
5817 make_friend_class (type, friend_type, /*complain=*/false);
5819 if (adjust_processing_template_decl)
5820 --processing_template_decl;
5824 /* Build new DECL_FRIENDLIST. */
5827 /* The the file and line for this declaration, to
5828 assist in error message reporting. Since we
5829 called push_tinst_level above, we don't need to
5831 input_location = DECL_SOURCE_LOCATION (t);
5833 if (TREE_CODE (t) == TEMPLATE_DECL)
5835 ++processing_template_decl;
5836 push_deferring_access_checks (dk_no_check);
5839 r = tsubst_friend_function (t, args);
5840 add_friend (type, r, /*complain=*/false);
5841 if (TREE_CODE (t) == TEMPLATE_DECL)
5843 pop_deferring_access_checks ();
5844 --processing_template_decl;
5850 /* Set the file and line number information to whatever is given for
5851 the class itself. This puts error messages involving generated
5852 implicit functions at a predictable point, and the same point
5853 that would be used for non-template classes. */
5854 input_location = DECL_SOURCE_LOCATION (typedecl);
5856 unreverse_member_declarations (type);
5857 finish_struct_1 (type);
5858 TYPE_BEING_DEFINED (type) = 0;
5860 /* Now that the class is complete, instantiate default arguments for
5861 any member functions. We don't do this earlier because the
5862 default arguments may reference members of the class. */
5863 if (!PRIMARY_TEMPLATE_P (template))
5864 for (t = TYPE_METHODS (type); t; t = TREE_CHAIN (t))
5865 if (TREE_CODE (t) == FUNCTION_DECL
5866 /* Implicitly generated member functions will not have template
5867 information; they are not instantiations, but instead are
5868 created "fresh" for each instantiation. */
5869 && DECL_TEMPLATE_INFO (t))
5870 tsubst_default_arguments (t);
5873 pop_from_top_level ();
5874 pop_deferring_access_checks ();
5877 /* The vtable for a template class can be emitted in any translation
5878 unit in which the class is instantiated. When there is no key
5879 method, however, finish_struct_1 will already have added TYPE to
5880 the keyed_classes list. */
5881 if (TYPE_CONTAINS_VPTR_P (type) && CLASSTYPE_KEY_METHOD (type))
5882 keyed_classes = tree_cons (NULL_TREE, type, keyed_classes);
5888 tsubst_template_arg (tree t, tree args, tsubst_flags_t complain, tree in_decl)
5894 else if (TYPE_P (t))
5895 r = tsubst (t, args, complain, in_decl);
5898 r = tsubst_expr (t, args, complain, in_decl);
5900 if (!uses_template_parms (r))
5902 /* Sometimes, one of the args was an expression involving a
5903 template constant parameter, like N - 1. Now that we've
5904 tsubst'd, we might have something like 2 - 1. This will
5905 confuse lookup_template_class, so we do constant folding
5906 here. We have to unset processing_template_decl, to fool
5907 tsubst_copy_and_build() into building an actual tree. */
5909 /* If the TREE_TYPE of ARG is not NULL_TREE, ARG is already
5910 as simple as it's going to get, and trying to reprocess
5911 the trees will break. Once tsubst_expr et al DTRT for
5912 non-dependent exprs, this code can go away, as the type
5913 will always be set. */
5916 int saved_processing_template_decl = processing_template_decl;
5917 processing_template_decl = 0;
5918 r = tsubst_copy_and_build (r, /*args=*/NULL_TREE,
5919 tf_error, /*in_decl=*/NULL_TREE,
5920 /*function_p=*/false);
5921 processing_template_decl = saved_processing_template_decl;
5929 /* Substitute ARGS into the vector or list of template arguments T. */
5932 tsubst_template_args (tree t, tree args, tsubst_flags_t complain, tree in_decl)
5934 int len = TREE_VEC_LENGTH (t);
5935 int need_new = 0, i;
5936 tree *elts = alloca (len * sizeof (tree));
5938 for (i = 0; i < len; i++)
5940 tree orig_arg = TREE_VEC_ELT (t, i);
5943 if (TREE_CODE (orig_arg) == TREE_VEC)
5944 new_arg = tsubst_template_args (orig_arg, args, complain, in_decl);
5946 new_arg = tsubst_template_arg (orig_arg, args, complain, in_decl);
5948 if (new_arg == error_mark_node)
5949 return error_mark_node;
5952 if (new_arg != orig_arg)
5959 t = make_tree_vec (len);
5960 for (i = 0; i < len; i++)
5961 TREE_VEC_ELT (t, i) = elts[i];
5966 /* Return the result of substituting ARGS into the template parameters
5967 given by PARMS. If there are m levels of ARGS and m + n levels of
5968 PARMS, then the result will contain n levels of PARMS. For
5969 example, if PARMS is `template <class T> template <class U>
5970 template <T*, U, class V>' and ARGS is {{int}, {double}} then the
5971 result will be `template <int*, double, class V>'. */
5974 tsubst_template_parms (tree parms, tree args, tsubst_flags_t complain)
5979 for (new_parms = &r;
5980 TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args);
5981 new_parms = &(TREE_CHAIN (*new_parms)),
5982 parms = TREE_CHAIN (parms))
5985 make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms)));
5988 for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i)
5990 tree tuple = TREE_VEC_ELT (TREE_VALUE (parms), i);
5991 tree default_value = TREE_PURPOSE (tuple);
5992 tree parm_decl = TREE_VALUE (tuple);
5994 parm_decl = tsubst (parm_decl, args, complain, NULL_TREE);
5995 default_value = tsubst_template_arg (default_value, args,
5996 complain, NULL_TREE);
5998 tuple = build_tree_list (default_value, parm_decl);
5999 TREE_VEC_ELT (new_vec, i) = tuple;
6003 tree_cons (size_int (TMPL_PARMS_DEPTH (parms)
6004 - TMPL_ARGS_DEPTH (args)),
6005 new_vec, NULL_TREE);
6011 /* Substitute the ARGS into the indicated aggregate (or enumeration)
6012 type T. If T is not an aggregate or enumeration type, it is
6013 handled as if by tsubst. IN_DECL is as for tsubst. If
6014 ENTERING_SCOPE is nonzero, T is the context for a template which
6015 we are presently tsubst'ing. Return the substituted value. */
6018 tsubst_aggr_type (tree t,
6020 tsubst_flags_t complain,
6027 switch (TREE_CODE (t))
6030 if (TYPE_PTRMEMFUNC_P (t))
6031 return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl);
6033 /* Else fall through. */
6036 if (TYPE_TEMPLATE_INFO (t))
6042 /* First, determine the context for the type we are looking
6044 context = TYPE_CONTEXT (t);
6046 context = tsubst_aggr_type (context, args, complain,
6047 in_decl, /*entering_scope=*/1);
6049 /* Then, figure out what arguments are appropriate for the
6050 type we are trying to find. For example, given:
6052 template <class T> struct S;
6053 template <class T, class U> void f(T, U) { S<U> su; }
6055 and supposing that we are instantiating f<int, double>,
6056 then our ARGS will be {int, double}, but, when looking up
6057 S we only want {double}. */
6058 argvec = tsubst_template_args (TYPE_TI_ARGS (t), args,
6060 if (argvec == error_mark_node)
6061 return error_mark_node;
6063 r = lookup_template_class (t, argvec, in_decl, context,
6064 entering_scope, complain);
6066 return cp_build_qualified_type_real (r, TYPE_QUALS (t), complain);
6069 /* This is not a template type, so there's nothing to do. */
6073 return tsubst (t, args, complain, in_decl);
6077 /* Substitute into the default argument ARG (a default argument for
6078 FN), which has the indicated TYPE. */
6081 tsubst_default_argument (tree fn, tree type, tree arg)
6083 tree saved_class_ptr = NULL_TREE;
6084 tree saved_class_ref = NULL_TREE;
6086 /* This default argument came from a template. Instantiate the
6087 default argument here, not in tsubst. In the case of
6096 we must be careful to do name lookup in the scope of S<T>,
6097 rather than in the current class. */
6098 push_access_scope (fn);
6099 /* The default argument expression should not be considered to be
6100 within the scope of FN. Since push_access_scope sets
6101 current_function_decl, we must explicitly clear it here. */
6102 current_function_decl = NULL_TREE;
6103 /* The "this" pointer is not valid in a default argument. */
6106 saved_class_ptr = current_class_ptr;
6107 cp_function_chain->x_current_class_ptr = NULL_TREE;
6108 saved_class_ref = current_class_ref;
6109 cp_function_chain->x_current_class_ref = NULL_TREE;
6112 push_deferring_access_checks(dk_no_deferred);
6113 arg = tsubst_expr (arg, DECL_TI_ARGS (fn),
6114 tf_error | tf_warning, NULL_TREE);
6115 pop_deferring_access_checks();
6117 /* Restore the "this" pointer. */
6120 cp_function_chain->x_current_class_ptr = saved_class_ptr;
6121 cp_function_chain->x_current_class_ref = saved_class_ref;
6124 pop_access_scope (fn);
6126 /* Make sure the default argument is reasonable. */
6127 arg = check_default_argument (type, arg);
6132 /* Substitute into all the default arguments for FN. */
6135 tsubst_default_arguments (tree fn)
6140 tmpl_args = DECL_TI_ARGS (fn);
6142 /* If this function is not yet instantiated, we certainly don't need
6143 its default arguments. */
6144 if (uses_template_parms (tmpl_args))
6147 for (arg = TYPE_ARG_TYPES (TREE_TYPE (fn));
6149 arg = TREE_CHAIN (arg))
6150 if (TREE_PURPOSE (arg))
6151 TREE_PURPOSE (arg) = tsubst_default_argument (fn,
6153 TREE_PURPOSE (arg));
6156 /* Substitute the ARGS into the T, which is a _DECL. Return the
6157 result of the substitution. Issue error and warning messages under
6158 control of COMPLAIN. */
6161 tsubst_decl (tree t, tree args, tsubst_flags_t complain)
6163 location_t saved_loc;
6167 /* Set the filename and linenumber to improve error-reporting. */
6168 saved_loc = input_location;
6169 input_location = DECL_SOURCE_LOCATION (t);
6171 switch (TREE_CODE (t))
6175 /* We can get here when processing a member function template,
6176 member class template, and template template parameter of
6177 a template class. */
6178 tree decl = DECL_TEMPLATE_RESULT (t);
6183 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t))
6185 /* Template template parameter is treated here. */
6186 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6187 if (new_type == error_mark_node)
6188 return error_mark_node;
6191 TREE_CHAIN (r) = NULL_TREE;
6192 TREE_TYPE (r) = new_type;
6193 DECL_TEMPLATE_RESULT (r)
6194 = build_decl (TYPE_DECL, DECL_NAME (decl), new_type);
6195 DECL_TEMPLATE_PARMS (r)
6196 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args,
6198 TYPE_NAME (new_type) = r;
6202 /* We might already have an instance of this template.
6203 The ARGS are for the surrounding class type, so the
6204 full args contain the tsubst'd args for the context,
6205 plus the innermost args from the template decl. */
6206 tmpl_args = DECL_CLASS_TEMPLATE_P (t)
6207 ? CLASSTYPE_TI_ARGS (TREE_TYPE (t))
6208 : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t));
6209 full_args = tsubst_template_args (tmpl_args, args,
6212 /* tsubst_template_args doesn't copy the vector if
6213 nothing changed. But, *something* should have
6215 gcc_assert (full_args != tmpl_args);
6217 spec = retrieve_specialization (t, full_args,
6218 /*class_specializations_p=*/true);
6219 if (spec != NULL_TREE)
6225 /* Make a new template decl. It will be similar to the
6226 original, but will record the current template arguments.
6227 We also create a new function declaration, which is just
6228 like the old one, but points to this new template, rather
6229 than the old one. */
6231 gcc_assert (DECL_LANG_SPECIFIC (r) != 0);
6232 TREE_CHAIN (r) = NULL_TREE;
6235 = tsubst_aggr_type (DECL_CONTEXT (t), args,
6237 /*entering_scope=*/1);
6238 DECL_TEMPLATE_INFO (r) = build_tree_list (t, args);
6240 if (TREE_CODE (decl) == TYPE_DECL)
6242 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6243 if (new_type == error_mark_node)
6244 return error_mark_node;
6246 TREE_TYPE (r) = new_type;
6247 CLASSTYPE_TI_TEMPLATE (new_type) = r;
6248 DECL_TEMPLATE_RESULT (r) = TYPE_MAIN_DECL (new_type);
6249 DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type);
6253 tree new_decl = tsubst (decl, args, complain, in_decl);
6254 if (new_decl == error_mark_node)
6255 return error_mark_node;
6257 DECL_TEMPLATE_RESULT (r) = new_decl;
6258 DECL_TI_TEMPLATE (new_decl) = r;
6259 TREE_TYPE (r) = TREE_TYPE (new_decl);
6260 DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl);
6263 SET_DECL_IMPLICIT_INSTANTIATION (r);
6264 DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE;
6265 DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE;
6267 /* The template parameters for this new template are all the
6268 template parameters for the old template, except the
6269 outermost level of parameters. */
6270 DECL_TEMPLATE_PARMS (r)
6271 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args,
6274 if (PRIMARY_TEMPLATE_P (t))
6275 DECL_PRIMARY_TEMPLATE (r) = r;
6277 if (TREE_CODE (decl) != TYPE_DECL)
6278 /* Record this non-type partial instantiation. */
6279 register_specialization (r, t,
6280 DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r)));
6287 tree argvec = NULL_TREE;
6295 /* Nobody should be tsubst'ing into non-template functions. */
6296 gcc_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE);
6298 if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL)
6303 /* If T is not dependent, just return it. We have to
6304 increment PROCESSING_TEMPLATE_DECL because
6305 value_dependent_expression_p assumes that nothing is
6306 dependent when PROCESSING_TEMPLATE_DECL is zero. */
6307 ++processing_template_decl;
6308 dependent_p = value_dependent_expression_p (t);
6309 --processing_template_decl;
6313 /* Calculate the most general template of which R is a
6314 specialization, and the complete set of arguments used to
6316 gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t));
6317 argvec = tsubst_template_args (DECL_TI_ARGS
6318 (DECL_TEMPLATE_RESULT (gen_tmpl)),
6319 args, complain, in_decl);
6321 /* Check to see if we already have this specialization. */
6322 spec = retrieve_specialization (gen_tmpl, argvec,
6323 /*class_specializations_p=*/false);
6331 /* We can see more levels of arguments than parameters if
6332 there was a specialization of a member template, like
6335 template <class T> struct S { template <class U> void f(); }
6336 template <> template <class U> void S<int>::f(U);
6338 Here, we'll be substituting into the specialization,
6339 because that's where we can find the code we actually
6340 want to generate, but we'll have enough arguments for
6341 the most general template.
6343 We also deal with the peculiar case:
6345 template <class T> struct S {
6346 template <class U> friend void f();
6348 template <class U> void f() {}
6350 template void f<double>();
6352 Here, the ARGS for the instantiation of will be {int,
6353 double}. But, we only need as many ARGS as there are
6354 levels of template parameters in CODE_PATTERN. We are
6355 careful not to get fooled into reducing the ARGS in
6358 template <class T> struct S { template <class U> void f(U); }
6359 template <class T> template <> void S<T>::f(int) {}
6361 which we can spot because the pattern will be a
6362 specialization in this case. */
6363 args_depth = TMPL_ARGS_DEPTH (args);
6365 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t)));
6366 if (args_depth > parms_depth
6367 && !DECL_TEMPLATE_SPECIALIZATION (t))
6368 args = get_innermost_template_args (args, parms_depth);
6372 /* This special case arises when we have something like this:
6374 template <class T> struct S {
6375 friend void f<int>(int, double);
6378 Here, the DECL_TI_TEMPLATE for the friend declaration
6379 will be an IDENTIFIER_NODE. We are being called from
6380 tsubst_friend_function, and we want only to create a
6381 new decl (R) with appropriate types so that we can call
6382 determine_specialization. */
6383 gen_tmpl = NULL_TREE;
6386 if (DECL_CLASS_SCOPE_P (t))
6388 if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t)))
6392 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args,
6393 complain, t, /*entering_scope=*/1);
6398 ctx = DECL_CONTEXT (t);
6400 type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6401 if (type == error_mark_node)
6402 return error_mark_node;
6404 /* We do NOT check for matching decls pushed separately at this
6405 point, as they may not represent instantiations of this
6406 template, and in any case are considered separate under the
6409 DECL_USE_TEMPLATE (r) = 0;
6410 TREE_TYPE (r) = type;
6411 /* Clear out the mangled name and RTL for the instantiation. */
6412 SET_DECL_ASSEMBLER_NAME (r, NULL_TREE);
6413 SET_DECL_RTL (r, NULL_RTX);
6414 DECL_INITIAL (r) = NULL_TREE;
6415 DECL_CONTEXT (r) = ctx;
6417 if (member && DECL_CONV_FN_P (r))
6418 /* Type-conversion operator. Reconstruct the name, in
6419 case it's the name of one of the template's parameters. */
6420 DECL_NAME (r) = mangle_conv_op_name_for_type (TREE_TYPE (type));
6422 DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args,
6424 DECL_RESULT (r) = NULL_TREE;
6426 TREE_STATIC (r) = 0;
6427 TREE_PUBLIC (r) = TREE_PUBLIC (t);
6428 DECL_EXTERNAL (r) = 1;
6429 /* If this is an instantiation of a function with internal
6430 linkage, we already know what object file linkage will be
6431 assigned to the instantiation. */
6432 DECL_INTERFACE_KNOWN (r) = !TREE_PUBLIC (r);
6433 DECL_DEFER_OUTPUT (r) = 0;
6434 TREE_CHAIN (r) = NULL_TREE;
6435 DECL_PENDING_INLINE_INFO (r) = 0;
6436 DECL_PENDING_INLINE_P (r) = 0;
6437 DECL_SAVED_TREE (r) = NULL_TREE;
6439 if (DECL_CLONED_FUNCTION (r))
6441 DECL_CLONED_FUNCTION (r) = tsubst (DECL_CLONED_FUNCTION (t),
6443 TREE_CHAIN (r) = TREE_CHAIN (DECL_CLONED_FUNCTION (r));
6444 TREE_CHAIN (DECL_CLONED_FUNCTION (r)) = r;
6447 /* Set up the DECL_TEMPLATE_INFO for R. There's no need to do
6448 this in the special friend case mentioned above where
6449 GEN_TMPL is NULL. */
6452 DECL_TEMPLATE_INFO (r)
6453 = tree_cons (gen_tmpl, argvec, NULL_TREE);
6454 SET_DECL_IMPLICIT_INSTANTIATION (r);
6455 register_specialization (r, gen_tmpl, argvec);
6457 /* We're not supposed to instantiate default arguments
6458 until they are called, for a template. But, for a
6461 template <class T> void f ()
6462 { extern void g(int i = T()); }
6464 we should do the substitution when the template is
6465 instantiated. We handle the member function case in
6466 instantiate_class_template since the default arguments
6467 might refer to other members of the class. */
6469 && !PRIMARY_TEMPLATE_P (gen_tmpl)
6470 && !uses_template_parms (argvec))
6471 tsubst_default_arguments (r);
6474 /* Copy the list of befriending classes. */
6475 for (friends = &DECL_BEFRIENDING_CLASSES (r);
6477 friends = &TREE_CHAIN (*friends))
6479 *friends = copy_node (*friends);
6480 TREE_VALUE (*friends) = tsubst (TREE_VALUE (*friends),
6485 if (DECL_CONSTRUCTOR_P (r) || DECL_DESTRUCTOR_P (r))
6487 maybe_retrofit_in_chrg (r);
6488 if (DECL_CONSTRUCTOR_P (r))
6489 grok_ctor_properties (ctx, r);
6490 /* If this is an instantiation of a member template, clone it.
6491 If it isn't, that'll be handled by
6492 clone_constructors_and_destructors. */
6493 if (PRIMARY_TEMPLATE_P (gen_tmpl))
6494 clone_function_decl (r, /*update_method_vec_p=*/0);
6496 else if (IDENTIFIER_OPNAME_P (DECL_NAME (r)))
6497 grok_op_properties (r, (complain & tf_error) != 0);
6499 if (DECL_FRIEND_P (t) && DECL_FRIEND_CONTEXT (t))
6500 SET_DECL_FRIEND_CONTEXT (r,
6501 tsubst (DECL_FRIEND_CONTEXT (t),
6502 args, complain, in_decl));
6511 if (DECL_TEMPLATE_PARM_P (t))
6512 SET_DECL_TEMPLATE_PARM_P (r);
6514 type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6515 type = type_decays_to (type);
6516 TREE_TYPE (r) = type;
6517 cp_apply_type_quals_to_decl (cp_type_quals (type), r);
6519 if (DECL_INITIAL (r))
6521 if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX)
6522 DECL_INITIAL (r) = TREE_TYPE (r);
6524 DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args,
6528 DECL_CONTEXT (r) = NULL_TREE;
6530 if (!DECL_TEMPLATE_PARM_P (r))
6531 DECL_ARG_TYPE (r) = type_passed_as (type);
6533 TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args,
6534 complain, TREE_CHAIN (t));
6543 type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6544 if (type == error_mark_node)
6545 return error_mark_node;
6546 TREE_TYPE (r) = type;
6547 cp_apply_type_quals_to_decl (cp_type_quals (type), r);
6549 /* We don't have to set DECL_CONTEXT here; it is set by
6550 finish_member_declaration. */
6551 DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args,
6553 TREE_CHAIN (r) = NULL_TREE;
6554 if (VOID_TYPE_P (type))
6555 cp_error_at ("instantiation of %qD as type %qT", r, type);
6560 /* We reach here only for member using decls. */
6561 if (DECL_DEPENDENT_P (t))
6563 r = do_class_using_decl
6564 (tsubst_copy (USING_DECL_SCOPE (t), args, complain, in_decl),
6565 tsubst_copy (DECL_NAME (t), args, complain, in_decl));
6567 r = error_mark_node;
6572 TREE_CHAIN (r) = NULL_TREE;
6579 tree argvec = NULL_TREE;
6580 tree gen_tmpl = NULL_TREE;
6582 tree tmpl = NULL_TREE;
6584 tree type = NULL_TREE;
6587 if (TREE_CODE (t) == TYPE_DECL)
6589 type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6590 if (TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM
6591 || t == TYPE_MAIN_DECL (TREE_TYPE (t)))
6593 /* If this is the canonical decl, we don't have to
6594 mess with instantiations, and often we can't (for
6595 typename, template type parms and such). Note that
6596 TYPE_NAME is not correct for the above test if
6597 we've copied the type for a typedef. */
6598 r = TYPE_NAME (type);
6603 /* Assume this is a non-local variable. */
6606 if (TYPE_P (CP_DECL_CONTEXT (t)))
6607 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args,
6609 in_decl, /*entering_scope=*/1);
6610 else if (DECL_NAMESPACE_SCOPE_P (t))
6611 ctx = DECL_CONTEXT (t);
6614 /* Subsequent calls to pushdecl will fill this in. */
6619 /* Check to see if we already have this specialization. */
6622 tmpl = DECL_TI_TEMPLATE (t);
6623 gen_tmpl = most_general_template (tmpl);
6624 argvec = tsubst (DECL_TI_ARGS (t), args, complain, in_decl);
6625 spec = retrieve_specialization (gen_tmpl, argvec,
6626 /*class_specializations_p=*/false);
6629 spec = retrieve_local_specialization (t);
6638 if (TREE_CODE (r) == VAR_DECL)
6640 type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6641 if (type == error_mark_node)
6642 return error_mark_node;
6643 type = complete_type (type);
6644 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r)
6645 = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (t);
6646 type = check_var_type (DECL_NAME (r), type);
6648 else if (DECL_SELF_REFERENCE_P (t))
6649 SET_DECL_SELF_REFERENCE_P (r);
6650 TREE_TYPE (r) = type;
6651 cp_apply_type_quals_to_decl (cp_type_quals (type), r);
6652 DECL_CONTEXT (r) = ctx;
6653 /* Clear out the mangled name and RTL for the instantiation. */
6654 SET_DECL_ASSEMBLER_NAME (r, NULL_TREE);
6655 SET_DECL_RTL (r, NULL_RTX);
6657 /* Don't try to expand the initializer until someone tries to use
6658 this variable; otherwise we run into circular dependencies. */
6659 DECL_INITIAL (r) = NULL_TREE;
6660 SET_DECL_RTL (r, NULL_RTX);
6661 DECL_SIZE (r) = DECL_SIZE_UNIT (r) = 0;
6663 /* Even if the original location is out of scope, the newly
6664 substituted one is not. */
6665 if (TREE_CODE (r) == VAR_DECL)
6667 DECL_DEAD_FOR_LOCAL (r) = 0;
6668 DECL_INITIALIZED_P (r) = 0;
6673 /* A static data member declaration is always marked
6674 external when it is declared in-class, even if an
6675 initializer is present. We mimic the non-template
6677 DECL_EXTERNAL (r) = 1;
6679 register_specialization (r, gen_tmpl, argvec);
6680 DECL_TEMPLATE_INFO (r) = tree_cons (tmpl, argvec, NULL_TREE);
6681 SET_DECL_IMPLICIT_INSTANTIATION (r);
6684 register_local_specialization (r, t);
6686 TREE_CHAIN (r) = NULL_TREE;
6695 /* Restore the file and line information. */
6696 input_location = saved_loc;
6701 /* Substitute into the ARG_TYPES of a function type. */
6704 tsubst_arg_types (tree arg_types,
6706 tsubst_flags_t complain,
6709 tree remaining_arg_types;
6712 tree result = NULL_TREE;
6714 if (!arg_types || arg_types == void_list_node)
6717 remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types),
6718 args, complain, in_decl);
6719 if (remaining_arg_types == error_mark_node)
6720 return error_mark_node;
6722 type = tsubst (TREE_VALUE (arg_types), args, complain, in_decl);
6723 if (type == error_mark_node)
6724 return error_mark_node;
6725 if (VOID_TYPE_P (type))
6727 if (complain & tf_error)
6729 error ("invalid parameter type %qT", type);
6731 cp_error_at ("in declaration %qD", in_decl);
6733 return error_mark_node;
6736 /* Do array-to-pointer, function-to-pointer conversion, and ignore
6737 top-level qualifiers as required. */
6738 type = TYPE_MAIN_VARIANT (type_decays_to (type));
6740 /* We do not substitute into default arguments here. The standard
6741 mandates that they be instantiated only when needed, which is
6742 done in build_over_call. */
6743 default_arg = TREE_PURPOSE (arg_types);
6745 if (default_arg && TREE_CODE (default_arg) == DEFAULT_ARG)
6747 /* We've instantiated a template before its default arguments
6748 have been parsed. This can happen for a nested template
6749 class, and is not an error unless we require the default
6750 argument in a call of this function. */
6751 result = tree_cons (default_arg, type, remaining_arg_types);
6752 VEC_safe_push (tree, gc, DEFARG_INSTANTIATIONS (default_arg), result);
6755 result = hash_tree_cons (default_arg, type, remaining_arg_types);
6760 /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does
6761 *not* handle the exception-specification for FNTYPE, because the
6762 initial substitution of explicitly provided template parameters
6763 during argument deduction forbids substitution into the
6764 exception-specification:
6768 All references in the function type of the function template to the
6769 corresponding template parameters are replaced by the specified tem-
6770 plate argument values. If a substitution in a template parameter or
6771 in the function type of the function template results in an invalid
6772 type, type deduction fails. [Note: The equivalent substitution in
6773 exception specifications is done only when the function is instanti-
6774 ated, at which point a program is ill-formed if the substitution
6775 results in an invalid type.] */
6778 tsubst_function_type (tree t,
6780 tsubst_flags_t complain,
6787 /* The TYPE_CONTEXT is not used for function/method types. */
6788 gcc_assert (TYPE_CONTEXT (t) == NULL_TREE);
6790 /* Substitute the return type. */
6791 return_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6792 if (return_type == error_mark_node)
6793 return error_mark_node;
6794 /* The standard does not presently indicate that creation of a
6795 function type with an invalid return type is a deduction failure.
6796 However, that is clearly analogous to creating an array of "void"
6797 or a reference to a reference. This is core issue #486. */
6798 if (TREE_CODE (return_type) == ARRAY_TYPE
6799 || TREE_CODE (return_type) == FUNCTION_TYPE)
6801 if (complain & tf_error)
6803 if (TREE_CODE (return_type) == ARRAY_TYPE)
6804 error ("function returning an array");
6806 error ("function returning a function");
6808 return error_mark_node;
6811 /* Substitute the argument types. */
6812 arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args,
6814 if (arg_types == error_mark_node)
6815 return error_mark_node;
6817 /* Construct a new type node and return it. */
6818 if (TREE_CODE (t) == FUNCTION_TYPE)
6819 fntype = build_function_type (return_type, arg_types);
6822 tree r = TREE_TYPE (TREE_VALUE (arg_types));
6823 if (! IS_AGGR_TYPE (r))
6827 Type deduction may fail for any of the following
6830 -- Attempting to create "pointer to member of T" when T
6831 is not a class type. */
6832 if (complain & tf_error)
6833 error ("creating pointer to member function of non-class type %qT",
6835 return error_mark_node;
6838 fntype = build_method_type_directly (r, return_type,
6839 TREE_CHAIN (arg_types));
6841 fntype = cp_build_qualified_type_real (fntype, TYPE_QUALS (t), complain);
6842 fntype = cp_build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (t));
6847 /* FNTYPE is a FUNCTION_TYPE or METHOD_TYPE. Substitute the template
6848 ARGS into that specification, and return the substituted
6849 specification. If there is no specification, return NULL_TREE. */
6852 tsubst_exception_specification (tree fntype,
6854 tsubst_flags_t complain,
6860 specs = TYPE_RAISES_EXCEPTIONS (fntype);
6861 new_specs = NULL_TREE;
6864 if (! TREE_VALUE (specs))
6870 spec = tsubst (TREE_VALUE (specs), args, complain, in_decl);
6871 if (spec == error_mark_node)
6873 new_specs = add_exception_specifier (new_specs, spec, complain);
6874 specs = TREE_CHAIN (specs);
6880 /* Substitute into the PARMS of a call-declarator. */
6883 tsubst_call_declarator_parms (tree parms,
6885 tsubst_flags_t complain,
6892 if (!parms || parms == void_list_node)
6895 new_parms = tsubst_call_declarator_parms (TREE_CHAIN (parms),
6896 args, complain, in_decl);
6898 /* Figure out the type of this parameter. */
6899 type = tsubst (TREE_VALUE (parms), args, complain, in_decl);
6901 /* Figure out the default argument as well. Note that we use
6902 tsubst_expr since the default argument is really an expression. */
6903 defarg = tsubst_expr (TREE_PURPOSE (parms), args, complain, in_decl);
6905 /* Chain this parameter on to the front of those we have already
6906 processed. We don't use hash_tree_cons because that function
6907 doesn't check TREE_PARMLIST. */
6908 new_parms = tree_cons (defarg, type, new_parms);
6913 /* Take the tree structure T and replace template parameters used
6914 therein with the argument vector ARGS. IN_DECL is an associated
6915 decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE.
6916 Issue error and warning messages under control of COMPLAIN. Note
6917 that we must be relatively non-tolerant of extensions here, in
6918 order to preserve conformance; if we allow substitutions that
6919 should not be allowed, we may allow argument deductions that should
6920 not succeed, and therefore report ambiguous overload situations
6921 where there are none. In theory, we could allow the substitution,
6922 but indicate that it should have failed, and allow our caller to
6923 make sure that the right thing happens, but we don't try to do this
6926 This function is used for dealing with types, decls and the like;
6927 for expressions, use tsubst_expr or tsubst_copy. */
6930 tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
6934 if (t == NULL_TREE || t == error_mark_node
6935 || t == integer_type_node
6936 || t == void_type_node
6937 || t == char_type_node
6938 || t == unknown_type_node
6939 || TREE_CODE (t) == NAMESPACE_DECL)
6943 return tsubst_decl (t, args, complain);
6945 if (TREE_CODE (t) == IDENTIFIER_NODE)
6946 type = IDENTIFIER_TYPE_VALUE (t);
6948 type = TREE_TYPE (t);
6950 gcc_assert (type != unknown_type_node);
6953 && TREE_CODE (t) != TYPENAME_TYPE
6954 && TREE_CODE (t) != IDENTIFIER_NODE
6955 && TREE_CODE (t) != FUNCTION_TYPE
6956 && TREE_CODE (t) != METHOD_TYPE)
6957 type = tsubst (type, args, complain, in_decl);
6958 if (type == error_mark_node)
6959 return error_mark_node;
6961 switch (TREE_CODE (t))
6966 return tsubst_aggr_type (t, args, complain, in_decl,
6967 /*entering_scope=*/0);
6970 case IDENTIFIER_NODE:
6982 if (t == integer_type_node)
6985 if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST
6986 && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST)
6990 tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0);
6992 /* The array dimension behaves like a non-type template arg,
6993 in that we want to fold it as much as possible. */
6994 max = tsubst_template_arg (omax, args, complain, in_decl);
6995 max = fold_decl_constant_value (max);
6997 if (integer_zerop (omax))
6999 /* Still allow an explicit array of size zero. */
7001 pedwarn ("creating array with size zero");
7003 else if (integer_zerop (max)
7004 || (TREE_CODE (max) == INTEGER_CST
7005 && INT_CST_LT (max, integer_zero_node)))
7009 Type deduction may fail for any of the following
7012 Attempting to create an array with a size that is
7013 zero or negative. */
7014 if (complain & tf_error)
7015 error ("creating array with size zero (%qE)", max);
7017 return error_mark_node;
7020 return compute_array_index_type (NULL_TREE, max);
7023 case TEMPLATE_TYPE_PARM:
7024 case TEMPLATE_TEMPLATE_PARM:
7025 case BOUND_TEMPLATE_TEMPLATE_PARM:
7026 case TEMPLATE_PARM_INDEX:
7031 tree arg = NULL_TREE;
7035 gcc_assert (TREE_VEC_LENGTH (args) > 0);
7036 if (TREE_CODE (t) == TEMPLATE_TYPE_PARM
7037 || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM
7038 || TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
7040 idx = TEMPLATE_TYPE_IDX (t);
7041 level = TEMPLATE_TYPE_LEVEL (t);
7045 idx = TEMPLATE_PARM_IDX (t);
7046 level = TEMPLATE_PARM_LEVEL (t);
7049 levels = TMPL_ARGS_DEPTH (args);
7050 if (level <= levels)
7051 arg = TMPL_ARG (args, level, idx);
7053 if (arg == error_mark_node)
7054 return error_mark_node;
7055 else if (arg != NULL_TREE)
7057 if (TREE_CODE (t) == TEMPLATE_TYPE_PARM)
7059 gcc_assert (TYPE_P (arg));
7060 return cp_build_qualified_type_real
7061 (arg, cp_type_quals (arg) | cp_type_quals (t),
7062 complain | tf_ignore_bad_quals);
7064 else if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
7066 /* We are processing a type constructed from a
7067 template template parameter. */
7068 tree argvec = tsubst (TYPE_TI_ARGS (t),
7069 args, complain, in_decl);
7070 if (argvec == error_mark_node)
7071 return error_mark_node;
7073 /* We can get a TEMPLATE_TEMPLATE_PARM here when we
7074 are resolving nested-types in the signature of a
7075 member function templates. Otherwise ARG is a
7076 TEMPLATE_DECL and is the real template to be
7078 if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM)
7079 arg = TYPE_NAME (arg);
7081 r = lookup_template_class (arg,
7084 /*entering_scope=*/0,
7086 return cp_build_qualified_type_real
7087 (r, TYPE_QUALS (t), complain);
7090 /* TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX. */
7095 /* This can happen during the attempted tsubst'ing in
7096 unify. This means that we don't yet have any information
7097 about the template parameter in question. */
7100 /* If we get here, we must have been looking at a parm for a
7101 more deeply nested template. Make a new version of this
7102 template parameter, but with a lower level. */
7103 switch (TREE_CODE (t))
7105 case TEMPLATE_TYPE_PARM:
7106 case TEMPLATE_TEMPLATE_PARM:
7107 case BOUND_TEMPLATE_TEMPLATE_PARM:
7108 if (cp_type_quals (t))
7110 r = tsubst (TYPE_MAIN_VARIANT (t), args, complain, in_decl);
7111 r = cp_build_qualified_type_real
7112 (r, cp_type_quals (t),
7113 complain | (TREE_CODE (t) == TEMPLATE_TYPE_PARM
7114 ? tf_ignore_bad_quals : 0));
7119 TEMPLATE_TYPE_PARM_INDEX (r)
7120 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t),
7122 TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r);
7123 TYPE_MAIN_VARIANT (r) = r;
7124 TYPE_POINTER_TO (r) = NULL_TREE;
7125 TYPE_REFERENCE_TO (r) = NULL_TREE;
7127 if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
7129 tree argvec = tsubst (TYPE_TI_ARGS (t), args,
7131 if (argvec == error_mark_node)
7132 return error_mark_node;
7134 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r)
7135 = tree_cons (TYPE_TI_TEMPLATE (t), argvec, NULL_TREE);
7140 case TEMPLATE_PARM_INDEX:
7141 r = reduce_template_parm_level (t, type, levels);
7153 tree purpose, value, chain;
7155 if (t == void_list_node)
7158 purpose = TREE_PURPOSE (t);
7161 purpose = tsubst (purpose, args, complain, in_decl);
7162 if (purpose == error_mark_node)
7163 return error_mark_node;
7165 value = TREE_VALUE (t);
7168 value = tsubst (value, args, complain, in_decl);
7169 if (value == error_mark_node)
7170 return error_mark_node;
7172 chain = TREE_CHAIN (t);
7173 if (chain && chain != void_type_node)
7175 chain = tsubst (chain, args, complain, in_decl);
7176 if (chain == error_mark_node)
7177 return error_mark_node;
7179 if (purpose == TREE_PURPOSE (t)
7180 && value == TREE_VALUE (t)
7181 && chain == TREE_CHAIN (t))
7183 return hash_tree_cons (purpose, value, chain);
7187 /* We should never be tsubsting a binfo. */
7191 /* A vector of template arguments. */
7193 return tsubst_template_args (t, args, complain, in_decl);
7196 case REFERENCE_TYPE:
7198 enum tree_code code;
7200 if (type == TREE_TYPE (t) && TREE_CODE (type) != METHOD_TYPE)
7203 code = TREE_CODE (t);
7208 Type deduction may fail for any of the following
7211 -- Attempting to create a pointer to reference type.
7212 -- Attempting to create a reference to a reference type or
7213 a reference to void. */
7214 if (TREE_CODE (type) == REFERENCE_TYPE
7215 || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE))
7217 static location_t last_loc;
7219 /* We keep track of the last time we issued this error
7220 message to avoid spewing a ton of messages during a
7221 single bad template instantiation. */
7222 if (complain & tf_error
7223 #ifdef USE_MAPPED_LOCATION
7224 && last_loc != input_location
7226 && (last_loc.line != input_line
7227 || last_loc.file != input_filename)
7231 if (TREE_CODE (type) == VOID_TYPE)
7232 error ("forming reference to void");
7234 error ("forming %s to reference type %qT",
7235 (code == POINTER_TYPE) ? "pointer" : "reference",
7237 last_loc = input_location;
7240 return error_mark_node;
7242 else if (code == POINTER_TYPE)
7244 r = build_pointer_type (type);
7245 if (TREE_CODE (type) == METHOD_TYPE)
7246 r = build_ptrmemfunc_type (r);
7249 r = build_reference_type (type);
7250 r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain);
7252 if (r != error_mark_node)
7253 /* Will this ever be needed for TYPE_..._TO values? */
7260 r = tsubst (TYPE_OFFSET_BASETYPE (t), args, complain, in_decl);
7261 if (r == error_mark_node || !IS_AGGR_TYPE (r))
7265 Type deduction may fail for any of the following
7268 -- Attempting to create "pointer to member of T" when T
7269 is not a class type. */
7270 if (complain & tf_error)
7271 error ("creating pointer to member of non-class type %qT", r);
7272 return error_mark_node;
7274 if (TREE_CODE (type) == REFERENCE_TYPE)
7276 if (complain & tf_error)
7277 error ("creating pointer to member reference type %qT", type);
7278 return error_mark_node;
7280 if (TREE_CODE (type) == VOID_TYPE)
7282 if (complain & tf_error)
7283 error ("creating pointer to member of type void");
7284 return error_mark_node;
7286 gcc_assert (TREE_CODE (type) != METHOD_TYPE);
7287 if (TREE_CODE (type) == FUNCTION_TYPE)
7289 /* The type of the implicit object parameter gets its
7290 cv-qualifiers from the FUNCTION_TYPE. */
7292 tree this_type = cp_build_qualified_type (TYPE_MAIN_VARIANT (r),
7293 cp_type_quals (type));
7295 method_type = build_method_type_directly (this_type,
7297 TYPE_ARG_TYPES (type));
7298 memptr = build_ptrmemfunc_type (build_pointer_type (method_type));
7299 return cp_build_qualified_type_real (memptr, cp_type_quals (t),
7303 return cp_build_qualified_type_real (build_ptrmem_type (r, type),
7312 fntype = tsubst_function_type (t, args, complain, in_decl);
7313 if (fntype == error_mark_node)
7314 return error_mark_node;
7316 /* Substitute the exception specification. */
7317 specs = tsubst_exception_specification (t, args, complain,
7320 fntype = build_exception_variant (fntype, specs);
7325 tree domain = tsubst (TYPE_DOMAIN (t), args, complain, in_decl);
7326 if (domain == error_mark_node)
7327 return error_mark_node;
7329 /* As an optimization, we avoid regenerating the array type if
7330 it will obviously be the same as T. */
7331 if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7334 /* These checks should match the ones in grokdeclarator.
7338 The deduction may fail for any of the following reasons:
7340 -- Attempting to create an array with an element type that
7341 is void, a function type, or a reference type, or [DR337]
7342 an abstract class type. */
7343 if (TREE_CODE (type) == VOID_TYPE
7344 || TREE_CODE (type) == FUNCTION_TYPE
7345 || TREE_CODE (type) == REFERENCE_TYPE)
7347 if (complain & tf_error)
7348 error ("creating array of %qT", type);
7349 return error_mark_node;
7351 if (CLASS_TYPE_P (type) && CLASSTYPE_PURE_VIRTUALS (type))
7353 if (complain & tf_error)
7354 error ("creating array of %qT, which is an abstract class type",
7356 return error_mark_node;
7359 r = build_cplus_array_type (type, domain);
7366 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7367 tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl);
7369 if (e1 == error_mark_node || e2 == error_mark_node)
7370 return error_mark_node;
7372 return fold_build2 (TREE_CODE (t), TREE_TYPE (t), e1, e2);
7378 tree e = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7379 if (e == error_mark_node)
7380 return error_mark_node;
7382 return fold_build1 (TREE_CODE (t), TREE_TYPE (t), e);
7387 tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain,
7388 in_decl, /*entering_scope=*/1);
7389 tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args,
7392 if (ctx == error_mark_node || f == error_mark_node)
7393 return error_mark_node;
7395 if (!IS_AGGR_TYPE (ctx))
7397 if (complain & tf_error)
7398 error ("%qT is not a class, struct, or union type", ctx);
7399 return error_mark_node;
7401 else if (!uses_template_parms (ctx) && !TYPE_BEING_DEFINED (ctx))
7403 /* Normally, make_typename_type does not require that the CTX
7404 have complete type in order to allow things like:
7406 template <class T> struct S { typename S<T>::X Y; };
7408 But, such constructs have already been resolved by this
7409 point, so here CTX really should have complete type, unless
7410 it's a partial instantiation. */
7411 ctx = complete_type (ctx);
7412 if (!COMPLETE_TYPE_P (ctx))
7414 if (complain & tf_error)
7415 cxx_incomplete_type_error (NULL_TREE, ctx);
7416 return error_mark_node;
7420 f = make_typename_type (ctx, f, typename_type,
7421 (complain & tf_error) | tf_keep_type_decl);
7422 if (f == error_mark_node)
7424 if (TREE_CODE (f) == TYPE_DECL)
7426 complain |= tf_ignore_bad_quals;
7430 if (TREE_CODE (f) != TYPENAME_TYPE)
7432 if (TYPENAME_IS_ENUM_P (t) && TREE_CODE (f) != ENUMERAL_TYPE)
7433 error ("%qT resolves to %qT, which is not an enumeration type",
7435 else if (TYPENAME_IS_CLASS_P (t) && !CLASS_TYPE_P (f))
7436 error ("%qT resolves to %qT, which is is not a class type",
7440 return cp_build_qualified_type_real
7441 (f, cp_type_quals (f) | cp_type_quals (t), complain);
7444 case UNBOUND_CLASS_TEMPLATE:
7446 tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain,
7447 in_decl, /*entering_scope=*/1);
7448 tree name = TYPE_IDENTIFIER (t);
7449 tree parm_list = DECL_TEMPLATE_PARMS (TYPE_NAME (t));
7451 if (ctx == error_mark_node || name == error_mark_node)
7452 return error_mark_node;
7455 parm_list = tsubst_template_parms (parm_list, args, complain);
7456 return make_unbound_class_template (ctx, name, parm_list, complain);
7466 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7467 tree e2 = tsubst_expr (TREE_OPERAND (t, 1), args, complain, in_decl);
7468 if (e1 == error_mark_node || e2 == error_mark_node)
7469 return error_mark_node;
7471 return build_nt (ARRAY_REF, e1, e2, NULL_TREE, NULL_TREE);
7476 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7477 tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl);
7478 if (e1 == error_mark_node || e2 == error_mark_node)
7479 return error_mark_node;
7481 return build_nt (TREE_CODE (t), e1, e2);
7488 type = finish_typeof (tsubst_expr (TYPEOF_TYPE_EXPR (t), args,
7489 complain, in_decl));
7490 return cp_build_qualified_type_real (type,
7492 | cp_type_quals (type),
7497 sorry ("use of %qs in template",
7498 tree_code_name [(int) TREE_CODE (t)]);
7499 return error_mark_node;
7503 /* Like tsubst_expr for a BASELINK. OBJECT_TYPE, if non-NULL, is the
7504 type of the expression on the left-hand side of the "." or "->"
7508 tsubst_baselink (tree baselink, tree object_type,
7509 tree args, tsubst_flags_t complain, tree in_decl)
7512 tree qualifying_scope;
7514 tree template_args = 0;
7515 bool template_id_p = false;
7517 /* A baselink indicates a function from a base class. The
7518 BASELINK_ACCESS_BINFO and BASELINK_BINFO are going to have
7519 non-dependent types; otherwise, the lookup could not have
7520 succeeded. However, they may indicate bases of the template
7521 class, rather than the instantiated class.
7523 In addition, lookups that were not ambiguous before may be
7524 ambiguous now. Therefore, we perform the lookup again. */
7525 qualifying_scope = BINFO_TYPE (BASELINK_ACCESS_BINFO (baselink));
7526 fns = BASELINK_FUNCTIONS (baselink);
7527 if (TREE_CODE (fns) == TEMPLATE_ID_EXPR)
7529 template_id_p = true;
7530 template_args = TREE_OPERAND (fns, 1);
7531 fns = TREE_OPERAND (fns, 0);
7533 template_args = tsubst_template_args (template_args, args,
7536 name = DECL_NAME (get_first_fn (fns));
7537 baselink = lookup_fnfields (qualifying_scope, name, /*protect=*/1);
7539 /* If lookup found a single function, mark it as used at this
7540 point. (If it lookup found multiple functions the one selected
7541 later by overload resolution will be marked as used at that
7543 if (BASELINK_P (baselink))
7544 fns = BASELINK_FUNCTIONS (baselink);
7545 if (!template_id_p && !really_overloaded_fn (fns))
7546 mark_used (OVL_CURRENT (fns));
7548 /* Add back the template arguments, if present. */
7549 if (BASELINK_P (baselink) && template_id_p)
7550 BASELINK_FUNCTIONS (baselink)
7551 = build_nt (TEMPLATE_ID_EXPR,
7552 BASELINK_FUNCTIONS (baselink),
7556 object_type = current_class_type;
7557 return adjust_result_of_qualified_name_lookup (baselink,
7562 /* Like tsubst_expr for a SCOPE_REF, given by QUALIFIED_ID. DONE is
7563 true if the qualified-id will be a postfix-expression in-and-of
7564 itself; false if more of the postfix-expression follows the
7565 QUALIFIED_ID. ADDRESS_P is true if the qualified-id is the operand
7569 tsubst_qualified_id (tree qualified_id, tree args,
7570 tsubst_flags_t complain, tree in_decl,
7571 bool done, bool address_p)
7579 gcc_assert (TREE_CODE (qualified_id) == SCOPE_REF);
7581 /* Figure out what name to look up. */
7582 name = TREE_OPERAND (qualified_id, 1);
7583 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
7586 template_args = TREE_OPERAND (name, 1);
7588 template_args = tsubst_template_args (template_args, args,
7590 name = TREE_OPERAND (name, 0);
7594 is_template = false;
7595 template_args = NULL_TREE;
7598 /* Substitute into the qualifying scope. When there are no ARGS, we
7599 are just trying to simplify a non-dependent expression. In that
7600 case the qualifying scope may be dependent, and, in any case,
7601 substituting will not help. */
7602 scope = TREE_OPERAND (qualified_id, 0);
7605 scope = tsubst (scope, args, complain, in_decl);
7606 expr = tsubst_copy (name, args, complain, in_decl);
7611 if (dependent_type_p (scope))
7612 return build_nt (SCOPE_REF, scope, expr);
7614 if (!BASELINK_P (name) && !DECL_P (expr))
7616 expr = lookup_qualified_name (scope, expr, /*is_type_p=*/0, false);
7617 if (TREE_CODE (TREE_CODE (expr) == TEMPLATE_DECL
7618 ? DECL_TEMPLATE_RESULT (expr) : expr) == TYPE_DECL)
7620 if (complain & tf_error)
7622 error ("dependent-name %qE is parsed as a non-type, but "
7623 "instantiation yields a type", qualified_id);
7624 inform ("say %<typename %E%> if a type is meant", qualified_id);
7626 return error_mark_node;
7632 check_accessibility_of_qualified_id (expr, /*object_type=*/NULL_TREE,
7634 /* Remember that there was a reference to this entity. */
7638 if (expr == error_mark_node || TREE_CODE (expr) == TREE_LIST)
7640 if (complain & tf_error)
7641 qualified_name_lookup_error (scope,
7642 TREE_OPERAND (qualified_id, 1),
7644 return error_mark_node;
7648 expr = lookup_template_function (expr, template_args);
7650 if (expr == error_mark_node && complain & tf_error)
7651 qualified_name_lookup_error (scope, TREE_OPERAND (qualified_id, 1),
7653 else if (TYPE_P (scope))
7655 expr = (adjust_result_of_qualified_name_lookup
7656 (expr, scope, current_class_type));
7657 expr = finish_qualified_id_expr (scope, expr, done, address_p);
7660 expr = convert_from_reference (expr);
7665 /* Like tsubst, but deals with expressions. This function just replaces
7666 template parms; to finish processing the resultant expression, use
7670 tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
7672 enum tree_code code;
7675 if (t == NULL_TREE || t == error_mark_node)
7678 code = TREE_CODE (t);
7683 r = retrieve_local_specialization (t);
7684 gcc_assert (r != NULL);
7693 if (DECL_TEMPLATE_PARM_P (t))
7694 return tsubst_copy (DECL_INITIAL (t), args, complain, in_decl);
7695 /* There is no need to substitute into namespace-scope
7697 if (DECL_NAMESPACE_SCOPE_P (t))
7699 /* If ARGS is NULL, then T is known to be non-dependent. */
7700 if (args == NULL_TREE)
7701 return integral_constant_value (t);
7703 /* Unfortunately, we cannot just call lookup_name here.
7706 template <int I> int f() {
7708 struct S { void g() { E e = a; } };
7711 When we instantiate f<7>::S::g(), say, lookup_name is not
7712 clever enough to find f<7>::a. */
7714 = tsubst_aggr_type (TREE_TYPE (t), args, complain, in_decl,
7715 /*entering_scope=*/0);
7717 for (v = TYPE_VALUES (enum_type);
7720 if (TREE_PURPOSE (v) == DECL_NAME (t))
7721 return TREE_VALUE (v);
7723 /* We didn't find the name. That should never happen; if
7724 name-lookup found it during preliminary parsing, we
7725 should find it again here during instantiation. */
7731 if (DECL_CONTEXT (t))
7735 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, complain, in_decl,
7736 /*entering_scope=*/1);
7737 if (ctx != DECL_CONTEXT (t))
7739 tree r = lookup_field (ctx, DECL_NAME (t), 0, false);
7742 if (complain & tf_error)
7743 error ("using invalid field %qD", t);
7744 return error_mark_node;
7754 if ((DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t))
7755 || local_variable_p (t))
7756 t = tsubst (t, args, complain, in_decl);
7761 return tsubst_baselink (t, current_class_type, args, complain, in_decl);
7764 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t))
7765 return tsubst (TREE_TYPE (DECL_TEMPLATE_RESULT (t)),
7766 args, complain, in_decl);
7767 else if (DECL_FUNCTION_TEMPLATE_P (t) && DECL_MEMBER_TEMPLATE_P (t))
7768 return tsubst (t, args, complain, in_decl);
7769 else if (DECL_CLASS_SCOPE_P (t)
7770 && uses_template_parms (DECL_CONTEXT (t)))
7772 /* Template template argument like the following example need
7775 template <template <class> class TT> struct C {};
7776 template <class T> struct D {
7777 template <class U> struct E {};
7782 We are processing the template argument `E' in #1 for
7783 the template instantiation #2. Originally, `E' is a
7784 TEMPLATE_DECL with `D<T>' as its DECL_CONTEXT. Now we
7785 have to substitute this with one having context `D<int>'. */
7787 tree context = tsubst (DECL_CONTEXT (t), args, complain, in_decl);
7788 return lookup_field (context, DECL_NAME(t), 0, false);
7791 /* Ordinary template template argument. */
7795 case REINTERPRET_CAST_EXPR:
7796 case CONST_CAST_EXPR:
7797 case STATIC_CAST_EXPR:
7798 case DYNAMIC_CAST_EXPR:
7801 (code, tsubst (TREE_TYPE (t), args, complain, in_decl),
7802 tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl));
7806 case TRUTH_NOT_EXPR:
7809 case UNARY_PLUS_EXPR: /* Unary + */
7818 (code, tsubst (TREE_TYPE (t), args, complain, in_decl),
7819 tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl));
7826 object = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl);
7827 name = TREE_OPERAND (t, 1);
7828 if (TREE_CODE (name) == BIT_NOT_EXPR)
7830 name = tsubst_copy (TREE_OPERAND (name, 0), args,
7832 name = build1 (BIT_NOT_EXPR, NULL_TREE, name);
7834 else if (TREE_CODE (name) == SCOPE_REF
7835 && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR)
7837 tree base = tsubst_copy (TREE_OPERAND (name, 0), args,
7839 name = TREE_OPERAND (name, 1);
7840 name = tsubst_copy (TREE_OPERAND (name, 0), args,
7842 name = build1 (BIT_NOT_EXPR, NULL_TREE, name);
7843 name = build_nt (SCOPE_REF, base, name);
7845 else if (TREE_CODE (name) == BASELINK)
7846 name = tsubst_baselink (name,
7847 non_reference (TREE_TYPE (object)),
7851 name = tsubst_copy (name, args, complain, in_decl);
7852 return build_nt (COMPONENT_REF, object, name, NULL_TREE);
7858 case TRUNC_DIV_EXPR:
7860 case FLOOR_DIV_EXPR:
7861 case ROUND_DIV_EXPR:
7862 case EXACT_DIV_EXPR:
7866 case TRUNC_MOD_EXPR:
7867 case FLOOR_MOD_EXPR:
7868 case TRUTH_ANDIF_EXPR:
7869 case TRUTH_ORIF_EXPR:
7870 case TRUTH_AND_EXPR:
7888 case PREDECREMENT_EXPR:
7889 case PREINCREMENT_EXPR:
7890 case POSTDECREMENT_EXPR:
7891 case POSTINCREMENT_EXPR:
7893 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7894 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl));
7899 tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7900 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl),
7901 NULL_TREE, NULL_TREE);
7904 return build_nt (code,
7905 tsubst_copy (TREE_OPERAND (t, 0), args,
7907 tsubst_copy (TREE_OPERAND (t, 1), args, complain,
7913 case PSEUDO_DTOR_EXPR:
7916 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7917 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl),
7918 tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl));
7919 TREE_NO_WARNING (r) = TREE_NO_WARNING (t);
7926 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7927 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl),
7928 tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl));
7929 NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t);
7936 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7937 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl));
7938 DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t);
7939 DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t);
7943 case TEMPLATE_ID_EXPR:
7945 /* Substituted template arguments */
7946 tree fn = TREE_OPERAND (t, 0);
7947 tree targs = TREE_OPERAND (t, 1);
7949 fn = tsubst_copy (fn, args, complain, in_decl);
7951 targs = tsubst_template_args (targs, args, complain, in_decl);
7953 return lookup_template_function (fn, targs);
7958 tree purpose, value, chain;
7960 if (t == void_list_node)
7963 purpose = TREE_PURPOSE (t);
7965 purpose = tsubst_copy (purpose, args, complain, in_decl);
7966 value = TREE_VALUE (t);
7968 value = tsubst_copy (value, args, complain, in_decl);
7969 chain = TREE_CHAIN (t);
7970 if (chain && chain != void_type_node)
7971 chain = tsubst_copy (chain, args, complain, in_decl);
7972 if (purpose == TREE_PURPOSE (t)
7973 && value == TREE_VALUE (t)
7974 && chain == TREE_CHAIN (t))
7976 return tree_cons (purpose, value, chain);
7983 case TEMPLATE_TYPE_PARM:
7984 case TEMPLATE_TEMPLATE_PARM:
7985 case BOUND_TEMPLATE_TEMPLATE_PARM:
7986 case TEMPLATE_PARM_INDEX:
7988 case REFERENCE_TYPE:
7994 case UNBOUND_CLASS_TEMPLATE:
7997 return tsubst (t, args, complain, in_decl);
7999 case IDENTIFIER_NODE:
8000 if (IDENTIFIER_TYPENAME_P (t))
8002 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
8003 return mangle_conv_op_name_for_type (new_type);
8010 r = build_constructor
8011 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8012 tsubst_copy (CONSTRUCTOR_ELTS (t), args, complain, in_decl));
8013 TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t);
8018 return build_x_va_arg (tsubst_copy (TREE_OPERAND (t, 0), args, complain,
8020 tsubst (TREE_TYPE (t), args, complain, in_decl));
8022 case CLEANUP_POINT_EXPR:
8023 /* We shouldn't have built any of these during initial template
8024 generation. Instead, they should be built during instantiation
8025 in response to the saved STMT_IS_FULL_EXPR_P setting. */
8033 /* Like tsubst_copy for expressions, etc. but also does semantic
8037 tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl)
8041 if (t == NULL_TREE || t == error_mark_node)
8044 if (EXPR_HAS_LOCATION (t))
8045 input_location = EXPR_LOCATION (t);
8046 if (STATEMENT_CODE_P (TREE_CODE (t)))
8047 current_stmt_tree ()->stmts_are_full_exprs_p = STMT_IS_FULL_EXPR_P (t);
8049 switch (TREE_CODE (t))
8051 case STATEMENT_LIST:
8053 tree_stmt_iterator i;
8054 for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i))
8055 tsubst_expr (tsi_stmt (i), args, complain, in_decl);
8059 case CTOR_INITIALIZER:
8060 finish_mem_initializers (tsubst_initializer_list
8061 (TREE_OPERAND (t, 0), args));
8065 finish_return_stmt (tsubst_expr (TREE_OPERAND (t, 0),
8066 args, complain, in_decl));
8070 tmp = tsubst_expr (EXPR_STMT_EXPR (t), args, complain, in_decl);
8071 if (EXPR_STMT_STMT_EXPR_RESULT (t))
8072 finish_stmt_expr_expr (tmp, cur_stmt_expr);
8074 finish_expr_stmt (tmp);
8078 do_using_directive (tsubst_expr (USING_STMT_NAMESPACE (t),
8079 args, complain, in_decl));
8087 decl = DECL_EXPR_DECL (t);
8088 if (TREE_CODE (decl) == LABEL_DECL)
8089 finish_label_decl (DECL_NAME (decl));
8090 else if (TREE_CODE (decl) == USING_DECL)
8092 tree scope = USING_DECL_SCOPE (decl);
8093 tree name = DECL_NAME (decl);
8096 scope = tsubst_expr (scope, args, complain, in_decl);
8097 decl = lookup_qualified_name (scope, name,
8098 /*is_type_p=*/false,
8099 /*complain=*/false);
8100 if (decl == error_mark_node || TREE_CODE (decl) == TREE_LIST)
8101 qualified_name_lookup_error (scope, name, decl);
8103 do_local_using_decl (decl, scope, name);
8107 init = DECL_INITIAL (decl);
8108 decl = tsubst (decl, args, complain, in_decl);
8109 if (decl != error_mark_node)
8112 DECL_INITIAL (decl) = error_mark_node;
8113 /* By marking the declaration as instantiated, we avoid
8114 trying to instantiate it. Since instantiate_decl can't
8115 handle local variables, and since we've already done
8116 all that needs to be done, that's the right thing to
8118 if (TREE_CODE (decl) == VAR_DECL)
8119 DECL_TEMPLATE_INSTANTIATED (decl) = 1;
8120 if (TREE_CODE (decl) == VAR_DECL
8121 && ANON_AGGR_TYPE_P (TREE_TYPE (decl)))
8122 /* Anonymous aggregates are a special case. */
8123 finish_anon_union (decl);
8126 maybe_push_decl (decl);
8127 if (TREE_CODE (decl) == VAR_DECL
8128 && DECL_PRETTY_FUNCTION_P (decl))
8130 /* For __PRETTY_FUNCTION__ we have to adjust the
8132 const char *const name
8133 = cxx_printable_name (current_function_decl, 2);
8134 init = cp_fname_init (name, &TREE_TYPE (decl));
8137 init = tsubst_expr (init, args, complain, in_decl);
8138 cp_finish_decl (decl, init, NULL_TREE, 0);
8143 /* A DECL_EXPR can also be used as an expression, in the condition
8144 clause of an if/for/while construct. */
8149 stmt = begin_for_stmt ();
8150 tsubst_expr (FOR_INIT_STMT (t), args, complain, in_decl);
8151 finish_for_init_stmt (stmt);
8152 tmp = tsubst_expr (FOR_COND (t), args, complain, in_decl);
8153 finish_for_cond (tmp, stmt);
8154 tmp = tsubst_expr (FOR_EXPR (t), args, complain, in_decl);
8155 finish_for_expr (tmp, stmt);
8156 tsubst_expr (FOR_BODY (t), args, complain, in_decl);
8157 finish_for_stmt (stmt);
8161 stmt = begin_while_stmt ();
8162 tmp = tsubst_expr (WHILE_COND (t), args, complain, in_decl);
8163 finish_while_stmt_cond (tmp, stmt);
8164 tsubst_expr (WHILE_BODY (t), args, complain, in_decl);
8165 finish_while_stmt (stmt);
8169 stmt = begin_do_stmt ();
8170 tsubst_expr (DO_BODY (t), args, complain, in_decl);
8171 finish_do_body (stmt);
8172 tmp = tsubst_expr (DO_COND (t), args, complain, in_decl);
8173 finish_do_stmt (tmp, stmt);
8177 stmt = begin_if_stmt ();
8178 tmp = tsubst_expr (IF_COND (t), args, complain, in_decl);
8179 finish_if_stmt_cond (tmp, stmt);
8180 tsubst_expr (THEN_CLAUSE (t), args, complain, in_decl);
8181 finish_then_clause (stmt);
8183 if (ELSE_CLAUSE (t))
8185 begin_else_clause (stmt);
8186 tsubst_expr (ELSE_CLAUSE (t), args, complain, in_decl);
8187 finish_else_clause (stmt);
8190 finish_if_stmt (stmt);
8194 if (BIND_EXPR_BODY_BLOCK (t))
8195 stmt = begin_function_body ();
8197 stmt = begin_compound_stmt (BIND_EXPR_TRY_BLOCK (t)
8198 ? BCS_TRY_BLOCK : 0);
8200 tsubst_expr (BIND_EXPR_BODY (t), args, complain, in_decl);
8202 if (BIND_EXPR_BODY_BLOCK (t))
8203 finish_function_body (stmt);
8205 finish_compound_stmt (stmt);
8209 finish_break_stmt ();
8213 finish_continue_stmt ();
8217 stmt = begin_switch_stmt ();
8218 tmp = tsubst_expr (SWITCH_STMT_COND (t), args, complain, in_decl);
8219 finish_switch_cond (tmp, stmt);
8220 tsubst_expr (SWITCH_STMT_BODY (t), args, complain, in_decl);
8221 finish_switch_stmt (stmt);
8224 case CASE_LABEL_EXPR:
8225 finish_case_label (tsubst_expr (CASE_LOW (t), args, complain, in_decl),
8226 tsubst_expr (CASE_HIGH (t), args, complain,
8231 finish_label_stmt (DECL_NAME (LABEL_EXPR_LABEL (t)));
8235 tmp = GOTO_DESTINATION (t);
8236 if (TREE_CODE (tmp) != LABEL_DECL)
8237 /* Computed goto's must be tsubst'd into. On the other hand,
8238 non-computed gotos must not be; the identifier in question
8239 will have no binding. */
8240 tmp = tsubst_expr (tmp, args, complain, in_decl);
8242 tmp = DECL_NAME (tmp);
8243 finish_goto_stmt (tmp);
8247 tmp = finish_asm_stmt
8248 (ASM_VOLATILE_P (t),
8249 tsubst_expr (ASM_STRING (t), args, complain, in_decl),
8250 tsubst_expr (ASM_OUTPUTS (t), args, complain, in_decl),
8251 tsubst_expr (ASM_INPUTS (t), args, complain, in_decl),
8252 tsubst_expr (ASM_CLOBBERS (t), args, complain, in_decl));
8254 tree asm_expr = tmp;
8255 if (TREE_CODE (asm_expr) == CLEANUP_POINT_EXPR)
8256 asm_expr = TREE_OPERAND (asm_expr, 0);
8257 ASM_INPUT_P (asm_expr) = ASM_INPUT_P (t);
8264 stmt = begin_try_block ();
8265 tsubst_expr (TRY_STMTS (t), args, complain, in_decl);
8266 finish_cleanup_try_block (stmt);
8267 finish_cleanup (tsubst_expr (TRY_HANDLERS (t), args,
8273 if (FN_TRY_BLOCK_P (t))
8274 stmt = begin_function_try_block ();
8276 stmt = begin_try_block ();
8278 tsubst_expr (TRY_STMTS (t), args, complain, in_decl);
8280 if (FN_TRY_BLOCK_P (t))
8281 finish_function_try_block (stmt);
8283 finish_try_block (stmt);
8285 tsubst_expr (TRY_HANDLERS (t), args, complain, in_decl);
8286 if (FN_TRY_BLOCK_P (t))
8287 finish_function_handler_sequence (stmt);
8289 finish_handler_sequence (stmt);
8297 stmt = begin_handler ();
8298 if (HANDLER_PARMS (t))
8300 decl = HANDLER_PARMS (t);
8301 decl = tsubst (decl, args, complain, in_decl);
8302 /* Prevent instantiate_decl from trying to instantiate
8303 this variable. We've already done all that needs to be
8305 DECL_TEMPLATE_INSTANTIATED (decl) = 1;
8309 finish_handler_parms (decl, stmt);
8310 tsubst_expr (HANDLER_BODY (t), args, complain, in_decl);
8311 finish_handler (stmt);
8316 tsubst (TREE_TYPE (t), args, complain, NULL_TREE);
8320 gcc_assert (!STATEMENT_CODE_P (TREE_CODE (t)));
8322 return tsubst_copy_and_build (t, args, complain, in_decl,
8323 /*function_p=*/false);
8329 /* T is a postfix-expression that is not being used in a function
8330 call. Return the substituted version of T. */
8333 tsubst_non_call_postfix_expression (tree t, tree args,
8334 tsubst_flags_t complain,
8337 if (TREE_CODE (t) == SCOPE_REF)
8338 t = tsubst_qualified_id (t, args, complain, in_decl,
8339 /*done=*/false, /*address_p=*/false);
8341 t = tsubst_copy_and_build (t, args, complain, in_decl,
8342 /*function_p=*/false);
8347 /* Like tsubst but deals with expressions and performs semantic
8348 analysis. FUNCTION_P is true if T is the "F" in "F (ARGS)". */
8351 tsubst_copy_and_build (tree t,
8353 tsubst_flags_t complain,
8357 #define RECUR(NODE) \
8358 tsubst_copy_and_build (NODE, args, complain, in_decl, /*function_p=*/false)
8362 if (t == NULL_TREE || t == error_mark_node)
8365 switch (TREE_CODE (t))
8370 case IDENTIFIER_NODE:
8374 tree qualifying_class;
8375 bool non_integral_constant_expression_p;
8376 const char *error_msg;
8378 if (IDENTIFIER_TYPENAME_P (t))
8380 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
8381 t = mangle_conv_op_name_for_type (new_type);
8384 /* Look up the name. */
8385 decl = lookup_name (t, 0);
8387 /* By convention, expressions use ERROR_MARK_NODE to indicate
8388 failure, not NULL_TREE. */
8389 if (decl == NULL_TREE)
8390 decl = error_mark_node;
8392 decl = finish_id_expression (t, decl, NULL_TREE,
8395 /*integral_constant_expression_p=*/false,
8396 /*allow_non_integral_constant_expression_p=*/false,
8397 &non_integral_constant_expression_p,
8401 if (!function_p && TREE_CODE (decl) == IDENTIFIER_NODE)
8402 decl = unqualified_name_lookup_error (decl);
8406 case TEMPLATE_ID_EXPR:
8409 tree template = RECUR (TREE_OPERAND (t, 0));
8410 tree targs = TREE_OPERAND (t, 1);
8413 targs = tsubst_template_args (targs, args, complain, in_decl);
8415 if (TREE_CODE (template) == COMPONENT_REF)
8417 object = TREE_OPERAND (template, 0);
8418 template = TREE_OPERAND (template, 1);
8422 template = lookup_template_function (template, targs);
8425 return build3 (COMPONENT_REF, TREE_TYPE (template),
8426 object, template, NULL_TREE);
8433 tree r = RECUR (TREE_OPERAND (t, 0));
8435 if (REFERENCE_REF_P (t))
8437 /* A type conversion to reference type will be enclosed in
8438 such an indirect ref, but the substitution of the cast
8439 will have also added such an indirect ref. */
8440 if (TREE_CODE (TREE_TYPE (r)) == REFERENCE_TYPE)
8441 r = convert_from_reference (r);
8444 r = build_x_indirect_ref (r, "unary *");
8450 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8451 RECUR (TREE_OPERAND (t, 0)));
8454 return build_functional_cast
8455 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8456 RECUR (TREE_OPERAND (t, 0)));
8458 case REINTERPRET_CAST_EXPR:
8459 return build_reinterpret_cast
8460 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8461 RECUR (TREE_OPERAND (t, 0)));
8463 case CONST_CAST_EXPR:
8464 return build_const_cast
8465 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8466 RECUR (TREE_OPERAND (t, 0)));
8468 case DYNAMIC_CAST_EXPR:
8469 return build_dynamic_cast
8470 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8471 RECUR (TREE_OPERAND (t, 0)));
8473 case STATIC_CAST_EXPR:
8474 return build_static_cast
8475 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8476 RECUR (TREE_OPERAND (t, 0)));
8478 case POSTDECREMENT_EXPR:
8479 case POSTINCREMENT_EXPR:
8480 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8481 args, complain, in_decl);
8482 return build_x_unary_op (TREE_CODE (t), op1);
8484 case PREDECREMENT_EXPR:
8485 case PREINCREMENT_EXPR:
8489 case TRUTH_NOT_EXPR:
8490 case UNARY_PLUS_EXPR: /* Unary + */
8493 return build_x_unary_op (TREE_CODE (t), RECUR (TREE_OPERAND (t, 0)));
8496 op1 = TREE_OPERAND (t, 0);
8497 if (TREE_CODE (op1) == SCOPE_REF)
8498 op1 = tsubst_qualified_id (op1, args, complain, in_decl,
8499 /*done=*/true, /*address_p=*/true);
8501 op1 = tsubst_non_call_postfix_expression (op1, args, complain,
8503 if (TREE_CODE (op1) == LABEL_DECL)
8504 return finish_label_address_expr (DECL_NAME (op1));
8505 return build_x_unary_op (ADDR_EXPR, op1);
8510 case TRUNC_DIV_EXPR:
8512 case FLOOR_DIV_EXPR:
8513 case ROUND_DIV_EXPR:
8514 case EXACT_DIV_EXPR:
8518 case TRUNC_MOD_EXPR:
8519 case FLOOR_MOD_EXPR:
8520 case TRUTH_ANDIF_EXPR:
8521 case TRUTH_ORIF_EXPR:
8522 case TRUTH_AND_EXPR:
8538 return build_x_binary_op
8540 RECUR (TREE_OPERAND (t, 0)),
8541 RECUR (TREE_OPERAND (t, 1)),
8542 /*overloaded_p=*/NULL);
8545 return tsubst_qualified_id (t, args, complain, in_decl, /*done=*/true,
8546 /*address_p=*/false);
8548 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8549 args, complain, in_decl);
8550 return build_x_binary_op (ARRAY_REF, op1, RECUR (TREE_OPERAND (t, 1)),
8551 /*overloaded_p=*/NULL);
8555 op1 = TREE_OPERAND (t, 0);
8558 /* When there are no ARGS, we are trying to evaluate a
8559 non-dependent expression from the parser. Trying to do
8560 the substitutions may not work. */
8562 op1 = TREE_TYPE (op1);
8571 return cxx_sizeof_or_alignof_type (op1, TREE_CODE (t), true);
8573 return cxx_sizeof_or_alignof_expr (op1, TREE_CODE (t));
8577 tree r = build_x_modify_expr
8578 (RECUR (TREE_OPERAND (t, 0)),
8579 TREE_CODE (TREE_OPERAND (t, 1)),
8580 RECUR (TREE_OPERAND (t, 2)));
8581 /* TREE_NO_WARNING must be set if either the expression was
8582 parenthesized or it uses an operator such as >>= rather
8583 than plain assignment. In the former case, it was already
8584 set and must be copied. In the latter case,
8585 build_x_modify_expr sets it and it must not be reset
8587 if (TREE_NO_WARNING (t))
8588 TREE_NO_WARNING (r) = TREE_NO_WARNING (t);
8593 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8594 args, complain, in_decl);
8595 /* Remember that there was a reference to this entity. */
8598 return build_x_arrow (op1);
8602 (RECUR (TREE_OPERAND (t, 0)),
8603 RECUR (TREE_OPERAND (t, 1)),
8604 RECUR (TREE_OPERAND (t, 2)),
8605 RECUR (TREE_OPERAND (t, 3)),
8606 NEW_EXPR_USE_GLOBAL (t));
8609 return delete_sanity
8610 (RECUR (TREE_OPERAND (t, 0)),
8611 RECUR (TREE_OPERAND (t, 1)),
8612 DELETE_EXPR_USE_VEC (t),
8613 DELETE_EXPR_USE_GLOBAL (t));
8616 return build_x_compound_expr (RECUR (TREE_OPERAND (t, 0)),
8617 RECUR (TREE_OPERAND (t, 1)));
8626 function = TREE_OPERAND (t, 0);
8627 /* When we parsed the expression, we determined whether or
8628 not Koenig lookup should be performed. */
8629 koenig_p = KOENIG_LOOKUP_P (t);
8630 if (TREE_CODE (function) == SCOPE_REF)
8633 function = tsubst_qualified_id (function, args, complain, in_decl,
8635 /*address_p=*/false);
8639 qualified_p = (TREE_CODE (function) == COMPONENT_REF
8640 && (TREE_CODE (TREE_OPERAND (function, 1))
8642 function = tsubst_copy_and_build (function, args, complain,
8645 if (BASELINK_P (function))
8649 call_args = RECUR (TREE_OPERAND (t, 1));
8651 /* We do not perform argument-dependent lookup if normal
8652 lookup finds a non-function, in accordance with the
8653 expected resolution of DR 218. */
8655 && ((is_overloaded_fn (function)
8656 /* If lookup found a member function, the Koenig lookup is
8657 not appropriate, even if an unqualified-name was used
8658 to denote the function. */
8659 && !DECL_FUNCTION_MEMBER_P (get_first_fn (function)))
8660 || TREE_CODE (function) == IDENTIFIER_NODE))
8661 function = perform_koenig_lookup (function, call_args);
8663 if (TREE_CODE (function) == IDENTIFIER_NODE)
8665 unqualified_name_lookup_error (function);
8666 return error_mark_node;
8669 /* Remember that there was a reference to this entity. */
8670 if (DECL_P (function))
8671 mark_used (function);
8673 if (TREE_CODE (function) == OFFSET_REF)
8674 return build_offset_ref_call_from_tree (function, call_args);
8675 if (TREE_CODE (function) == COMPONENT_REF)
8677 if (!BASELINK_P (TREE_OPERAND (function, 1)))
8678 return finish_call_expr (function, call_args,
8679 /*disallow_virtual=*/false,
8680 /*koenig_p=*/false);
8682 return (build_new_method_call
8683 (TREE_OPERAND (function, 0),
8684 TREE_OPERAND (function, 1),
8685 call_args, NULL_TREE,
8686 qualified_p ? LOOKUP_NONVIRTUAL : LOOKUP_NORMAL));
8688 return finish_call_expr (function, call_args,
8689 /*disallow_virtual=*/qualified_p,
8694 return build_x_conditional_expr
8695 (RECUR (TREE_OPERAND (t, 0)),
8696 RECUR (TREE_OPERAND (t, 1)),
8697 RECUR (TREE_OPERAND (t, 2)));
8699 case PSEUDO_DTOR_EXPR:
8700 return finish_pseudo_destructor_expr
8701 (RECUR (TREE_OPERAND (t, 0)),
8702 RECUR (TREE_OPERAND (t, 1)),
8703 RECUR (TREE_OPERAND (t, 2)));
8707 tree purpose, value, chain;
8709 if (t == void_list_node)
8712 purpose = TREE_PURPOSE (t);
8714 purpose = RECUR (purpose);
8715 value = TREE_VALUE (t);
8717 value = RECUR (value);
8718 chain = TREE_CHAIN (t);
8719 if (chain && chain != void_type_node)
8720 chain = RECUR (chain);
8721 if (purpose == TREE_PURPOSE (t)
8722 && value == TREE_VALUE (t)
8723 && chain == TREE_CHAIN (t))
8725 return tree_cons (purpose, value, chain);
8733 object = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8734 args, complain, in_decl);
8735 /* Remember that there was a reference to this entity. */
8736 if (DECL_P (object))
8739 member = TREE_OPERAND (t, 1);
8740 if (BASELINK_P (member))
8741 member = tsubst_baselink (member,
8742 non_reference (TREE_TYPE (object)),
8743 args, complain, in_decl);
8745 member = tsubst_copy (member, args, complain, in_decl);
8747 if (member == error_mark_node)
8748 return error_mark_node;
8749 else if (!CLASS_TYPE_P (TREE_TYPE (object)))
8751 if (TREE_CODE (member) == BIT_NOT_EXPR)
8752 return finish_pseudo_destructor_expr (object,
8754 TREE_TYPE (object));
8755 else if (TREE_CODE (member) == SCOPE_REF
8756 && (TREE_CODE (TREE_OPERAND (member, 1)) == BIT_NOT_EXPR))
8757 return finish_pseudo_destructor_expr (object,
8759 TREE_TYPE (object));
8761 else if (TREE_CODE (member) == SCOPE_REF
8762 && TREE_CODE (TREE_OPERAND (member, 1)) == TEMPLATE_ID_EXPR)
8767 /* Lookup the template functions now that we know what the
8769 tmpl = TREE_OPERAND (TREE_OPERAND (member, 1), 0);
8770 args = TREE_OPERAND (TREE_OPERAND (member, 1), 1);
8771 member = lookup_qualified_name (TREE_OPERAND (member, 0), tmpl,
8772 /*is_type_p=*/false,
8773 /*complain=*/false);
8774 if (BASELINK_P (member))
8776 BASELINK_FUNCTIONS (member)
8777 = build_nt (TEMPLATE_ID_EXPR, BASELINK_FUNCTIONS (member),
8779 member = (adjust_result_of_qualified_name_lookup
8780 (member, BINFO_TYPE (BASELINK_BINFO (member)),
8781 TREE_TYPE (object)));
8785 qualified_name_lookup_error (TREE_TYPE (object), tmpl,
8787 return error_mark_node;
8790 else if (TREE_CODE (member) == SCOPE_REF
8791 && !CLASS_TYPE_P (TREE_OPERAND (member, 0))
8792 && TREE_CODE (TREE_OPERAND (member, 0)) != NAMESPACE_DECL)
8794 if (complain & tf_error)
8796 if (TYPE_P (TREE_OPERAND (member, 0)))
8797 error ("%qT is not a class or namespace",
8798 TREE_OPERAND (member, 0));
8800 error ("%qD is not a class or namespace",
8801 TREE_OPERAND (member, 0));
8803 return error_mark_node;
8805 else if (TREE_CODE (member) == FIELD_DECL)
8806 return finish_non_static_data_member (member, object, NULL_TREE);
8808 return finish_class_member_access_expr (object, member);
8813 (RECUR (TREE_OPERAND (t, 0)));
8819 tree type = tsubst (TREE_TYPE (t), args, complain, in_decl);
8822 /* digest_init will do the wrong thing if we let it. */
8823 if (type && TYPE_PTRMEMFUNC_P (type))
8827 /* We do not want to process the purpose of aggregate
8828 initializers as they are identifier nodes which will be
8829 looked up by digest_init. */
8830 purpose_p = !(type && IS_AGGR_TYPE (type));
8831 for (elts = CONSTRUCTOR_ELTS (t);
8833 elts = TREE_CHAIN (elts))
8835 tree purpose = TREE_PURPOSE (elts);
8836 tree value = TREE_VALUE (elts);
8838 if (purpose && purpose_p)
8839 purpose = RECUR (purpose);
8840 value = RECUR (value);
8841 r = tree_cons (purpose, value, r);
8844 r = build_constructor (NULL_TREE, nreverse (r));
8845 TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t);
8848 return digest_init (type, r, 0);
8854 tree operand_0 = RECUR (TREE_OPERAND (t, 0));
8855 if (TYPE_P (operand_0))
8856 return get_typeid (operand_0);
8857 return build_typeid (operand_0);
8867 tree r = tsubst_copy (t, args, complain, in_decl);
8869 if (TREE_CODE (TREE_TYPE (t)) != REFERENCE_TYPE)
8870 /* If the original type was a reference, we'll be wrapped in
8871 the appropriate INDIRECT_REF. */
8872 r = convert_from_reference (r);
8877 return build_x_va_arg (RECUR (TREE_OPERAND (t, 0)),
8878 tsubst_copy (TREE_TYPE (t), args, complain,
8882 return fold_offsetof (RECUR (TREE_OPERAND (t, 0)));
8886 tree old_stmt_expr = cur_stmt_expr;
8887 tree stmt_expr = begin_stmt_expr ();
8889 cur_stmt_expr = stmt_expr;
8890 tsubst_expr (STMT_EXPR_STMT (t), args, complain, in_decl);
8891 stmt_expr = finish_stmt_expr (stmt_expr, false);
8892 cur_stmt_expr = old_stmt_expr;
8898 t = tsubst_copy (t, args, complain, in_decl);
8899 /* As in finish_id_expression, we resolve enumeration constants
8900 to their underlying values. */
8901 if (TREE_CODE (t) == CONST_DECL)
8902 return DECL_INITIAL (t);
8906 /* Handle Objective-C++ constructs, if appropriate. */
8909 = objcp_tsubst_copy_and_build (t, args, complain,
8910 in_decl, /*function_p=*/false);
8914 return tsubst_copy (t, args, complain, in_decl);
8920 /* Verify that the instantiated ARGS are valid. For type arguments,
8921 make sure that the type's linkage is ok. For non-type arguments,
8922 make sure they are constants if they are integral or enumerations.
8923 Emit an error under control of COMPLAIN, and return TRUE on error. */
8926 check_instantiated_args (tree tmpl, tree args, tsubst_flags_t complain)
8928 int ix, len = DECL_NTPARMS (tmpl);
8929 bool result = false;
8930 bool error_p = complain & tf_error;
8932 for (ix = 0; ix != len; ix++)
8934 tree t = TREE_VEC_ELT (args, ix);
8938 /* [basic.link]: A name with no linkage (notably, the name
8939 of a class or enumeration declared in a local scope)
8940 shall not be used to declare an entity with linkage.
8941 This implies that names with no linkage cannot be used as
8942 template arguments. */
8943 tree nt = no_linkage_check (t, /*relaxed_p=*/false);
8947 if (TYPE_ANONYMOUS_P (nt))
8948 error ("%qT is/uses anonymous type", t);
8950 error ("%qT uses local type %qT", t, nt);
8954 /* In order to avoid all sorts of complications, we do not
8955 allow variably-modified types as template arguments. */
8956 else if (variably_modified_type_p (t, NULL_TREE))
8958 if (complain & tf_error)
8959 error ("%qT is a variably modified type", t);
8963 /* A non-type argument of integral or enumerated type must be a
8965 else if (TREE_TYPE (t)
8966 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t))
8967 && !TREE_CONSTANT (t))
8969 if (complain & tf_error)
8970 error ("integral expression %qE is not constant", t);
8974 if (result && error_p)
8975 error (" trying to instantiate %qD", tmpl);
8979 /* Instantiate the indicated variable or function template TMPL with
8980 the template arguments in TARG_PTR. */
8983 instantiate_template (tree tmpl, tree targ_ptr, tsubst_flags_t complain)
8989 if (tmpl == error_mark_node)
8990 return error_mark_node;
8992 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
8994 /* If this function is a clone, handle it specially. */
8995 if (DECL_CLONED_FUNCTION_P (tmpl))
9000 spec = instantiate_template (DECL_CLONED_FUNCTION (tmpl), targ_ptr,
9002 if (spec == error_mark_node)
9003 return error_mark_node;
9005 /* Look for the clone. */
9006 FOR_EACH_CLONE (clone, spec)
9007 if (DECL_NAME (clone) == DECL_NAME (tmpl))
9009 /* We should always have found the clone by now. */
9014 /* Check to see if we already have this specialization. */
9015 spec = retrieve_specialization (tmpl, targ_ptr,
9016 /*class_specializations_p=*/false);
9017 if (spec != NULL_TREE)
9020 gen_tmpl = most_general_template (tmpl);
9021 if (tmpl != gen_tmpl)
9023 /* The TMPL is a partial instantiation. To get a full set of
9024 arguments we must add the arguments used to perform the
9025 partial instantiation. */
9026 targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl),
9029 /* Check to see if we already have this specialization. */
9030 spec = retrieve_specialization (gen_tmpl, targ_ptr,
9031 /*class_specializations_p=*/false);
9032 if (spec != NULL_TREE)
9036 if (check_instantiated_args (gen_tmpl, INNERMOST_TEMPLATE_ARGS (targ_ptr),
9038 return error_mark_node;
9040 /* We are building a FUNCTION_DECL, during which the access of its
9041 parameters and return types have to be checked. However this
9042 FUNCTION_DECL which is the desired context for access checking
9043 is not built yet. We solve this chicken-and-egg problem by
9044 deferring all checks until we have the FUNCTION_DECL. */
9045 push_deferring_access_checks (dk_deferred);
9047 /* Substitute template parameters. */
9048 fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl),
9049 targ_ptr, complain, gen_tmpl);
9051 /* Now we know the specialization, compute access previously
9053 push_access_scope (fndecl);
9054 perform_deferred_access_checks ();
9055 pop_access_scope (fndecl);
9056 pop_deferring_access_checks ();
9058 /* The DECL_TI_TEMPLATE should always be the immediate parent
9059 template, not the most general template. */
9060 DECL_TI_TEMPLATE (fndecl) = tmpl;
9062 /* If we've just instantiated the main entry point for a function,
9063 instantiate all the alternate entry points as well. We do this
9064 by cloning the instantiation of the main entry point, not by
9065 instantiating the template clones. */
9066 if (TREE_CHAIN (gen_tmpl) && DECL_CLONED_FUNCTION_P (TREE_CHAIN (gen_tmpl)))
9067 clone_function_decl (fndecl, /*update_method_vec_p=*/0);
9072 /* The FN is a TEMPLATE_DECL for a function. The ARGS are the
9073 arguments that are being used when calling it. TARGS is a vector
9074 into which the deduced template arguments are placed.
9076 Return zero for success, 2 for an incomplete match that doesn't resolve
9077 all the types, and 1 for complete failure. An error message will be
9078 printed only for an incomplete match.
9080 If FN is a conversion operator, or we are trying to produce a specific
9081 specialization, RETURN_TYPE is the return type desired.
9083 The EXPLICIT_TARGS are explicit template arguments provided via a
9086 The parameter STRICT is one of:
9089 We are deducing arguments for a function call, as in
9093 We are deducing arguments for a conversion function, as in
9097 We are deducing arguments when doing an explicit instantiation
9098 as in [temp.explicit], when determining an explicit specialization
9099 as in [temp.expl.spec], or when taking the address of a function
9100 template, as in [temp.deduct.funcaddr]. */
9103 fn_type_unification (tree fn,
9104 tree explicit_targs,
9108 unification_kind_t strict)
9114 gcc_assert (TREE_CODE (fn) == TEMPLATE_DECL);
9116 fntype = TREE_TYPE (fn);
9121 The specified template arguments must match the template
9122 parameters in kind (i.e., type, nontype, template), and there
9123 must not be more arguments than there are parameters;
9124 otherwise type deduction fails.
9126 Nontype arguments must match the types of the corresponding
9127 nontype template parameters, or must be convertible to the
9128 types of the corresponding nontype parameters as specified in
9129 _temp.arg.nontype_, otherwise type deduction fails.
9131 All references in the function type of the function template
9132 to the corresponding template parameters are replaced by the
9133 specified template argument values. If a substitution in a
9134 template parameter or in the function type of the function
9135 template results in an invalid type, type deduction fails. */
9137 tree converted_args;
9140 if (explicit_targs == error_mark_node)
9144 = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn),
9145 explicit_targs, NULL_TREE, tf_none,
9146 /*require_all_arguments=*/0));
9147 if (converted_args == error_mark_node)
9150 /* Substitute the explicit args into the function type. This is
9151 necessary so that, for instance, explicitly declared function
9152 arguments can match null pointed constants. If we were given
9153 an incomplete set of explicit args, we must not do semantic
9154 processing during substitution as we could create partial
9156 incomplete = NUM_TMPL_ARGS (explicit_targs) != NUM_TMPL_ARGS (targs);
9157 processing_template_decl += incomplete;
9158 fntype = tsubst (fntype, converted_args, tf_none, NULL_TREE);
9159 processing_template_decl -= incomplete;
9161 if (fntype == error_mark_node)
9164 /* Place the explicitly specified arguments in TARGS. */
9165 for (i = NUM_TMPL_ARGS (converted_args); i--;)
9166 TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (converted_args, i);
9169 parms = TYPE_ARG_TYPES (fntype);
9170 /* Never do unification on the 'this' parameter. */
9171 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
9172 parms = TREE_CHAIN (parms);
9176 /* We've been given a return type to match, prepend it. */
9177 parms = tree_cons (NULL_TREE, TREE_TYPE (fntype), parms);
9178 args = tree_cons (NULL_TREE, return_type, args);
9181 /* We allow incomplete unification without an error message here
9182 because the standard doesn't seem to explicitly prohibit it. Our
9183 callers must be ready to deal with unification failures in any
9185 result = type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn),
9186 targs, parms, args, /*subr=*/0,
9187 strict, /*allow_incomplete*/1);
9190 /* All is well so far. Now, check:
9194 When all template arguments have been deduced, all uses of
9195 template parameters in nondeduced contexts are replaced with
9196 the corresponding deduced argument values. If the
9197 substitution results in an invalid type, as described above,
9198 type deduction fails. */
9199 if (tsubst (TREE_TYPE (fn), targs, tf_none, NULL_TREE)
9206 /* Adjust types before performing type deduction, as described in
9207 [temp.deduct.call] and [temp.deduct.conv]. The rules in these two
9208 sections are symmetric. PARM is the type of a function parameter
9209 or the return type of the conversion function. ARG is the type of
9210 the argument passed to the call, or the type of the value
9211 initialized with the result of the conversion function. */
9214 maybe_adjust_types_for_deduction (unification_kind_t strict,
9227 /* Swap PARM and ARG throughout the remainder of this
9228 function; the handling is precisely symmetric since PARM
9229 will initialize ARG rather than vice versa. */
9237 /* There is nothing to do in this case. */
9244 if (TREE_CODE (*parm) != REFERENCE_TYPE)
9246 /* [temp.deduct.call]
9248 If P is not a reference type:
9250 --If A is an array type, the pointer type produced by the
9251 array-to-pointer standard conversion (_conv.array_) is
9252 used in place of A for type deduction; otherwise,
9254 --If A is a function type, the pointer type produced by
9255 the function-to-pointer standard conversion
9256 (_conv.func_) is used in place of A for type deduction;
9259 --If A is a cv-qualified type, the top level
9260 cv-qualifiers of A's type are ignored for type
9262 if (TREE_CODE (*arg) == ARRAY_TYPE)
9263 *arg = build_pointer_type (TREE_TYPE (*arg));
9264 else if (TREE_CODE (*arg) == FUNCTION_TYPE)
9265 *arg = build_pointer_type (*arg);
9267 *arg = TYPE_MAIN_VARIANT (*arg);
9270 /* [temp.deduct.call]
9272 If P is a cv-qualified type, the top level cv-qualifiers
9273 of P's type are ignored for type deduction. If P is a
9274 reference type, the type referred to by P is used for
9276 *parm = TYPE_MAIN_VARIANT (*parm);
9277 if (TREE_CODE (*parm) == REFERENCE_TYPE)
9279 *parm = TREE_TYPE (*parm);
9280 result |= UNIFY_ALLOW_OUTER_MORE_CV_QUAL;
9283 /* DR 322. For conversion deduction, remove a reference type on parm
9284 too (which has been swapped into ARG). */
9285 if (strict == DEDUCE_CONV && TREE_CODE (*arg) == REFERENCE_TYPE)
9286 *arg = TREE_TYPE (*arg);
9291 /* Most parms like fn_type_unification.
9293 If SUBR is 1, we're being called recursively (to unify the
9294 arguments of a function or method parameter of a function
9298 type_unification_real (tree tparms,
9303 unification_kind_t strict,
9304 int allow_incomplete)
9308 int ntparms = TREE_VEC_LENGTH (tparms);
9310 int saw_undeduced = 0;
9313 gcc_assert (TREE_CODE (tparms) == TREE_VEC);
9314 gcc_assert (xparms == NULL_TREE || TREE_CODE (xparms) == TREE_LIST);
9315 gcc_assert (!xargs || TREE_CODE (xargs) == TREE_LIST);
9316 gcc_assert (ntparms > 0);
9321 sub_strict = (UNIFY_ALLOW_OUTER_LEVEL | UNIFY_ALLOW_MORE_CV_QUAL
9322 | UNIFY_ALLOW_DERIVED);
9326 sub_strict = UNIFY_ALLOW_LESS_CV_QUAL;
9330 sub_strict = UNIFY_ALLOW_NONE;
9341 while (parms && parms != void_list_node
9342 && args && args != void_list_node)
9344 parm = TREE_VALUE (parms);
9345 parms = TREE_CHAIN (parms);
9346 arg = TREE_VALUE (args);
9347 args = TREE_CHAIN (args);
9349 if (arg == error_mark_node)
9351 if (arg == unknown_type_node)
9352 /* We can't deduce anything from this, but we might get all the
9353 template args from other function args. */
9356 /* Conversions will be performed on a function argument that
9357 corresponds with a function parameter that contains only
9358 non-deducible template parameters and explicitly specified
9359 template parameters. */
9360 if (!uses_template_parms (parm))
9365 type = TREE_TYPE (arg);
9369 if (strict == DEDUCE_EXACT)
9371 if (same_type_p (parm, type))
9375 /* It might work; we shouldn't check now, because we might
9376 get into infinite recursion. Overload resolution will
9385 gcc_assert (TREE_TYPE (arg) != NULL_TREE);
9386 if (type_unknown_p (arg))
9388 /* [temp.deduct.type] A template-argument can be deduced from
9389 a pointer to function or pointer to member function
9390 argument if the set of overloaded functions does not
9391 contain function templates and at most one of a set of
9392 overloaded functions provides a unique match. */
9394 if (resolve_overloaded_unification
9395 (tparms, targs, parm, arg, strict, sub_strict)
9400 arg = TREE_TYPE (arg);
9401 if (arg == error_mark_node)
9406 int arg_strict = sub_strict;
9409 arg_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg);
9411 if (unify (tparms, targs, parm, arg, arg_strict))
9416 /* Fail if we've reached the end of the parm list, and more args
9417 are present, and the parm list isn't variadic. */
9418 if (args && args != void_list_node && parms == void_list_node)
9420 /* Fail if parms are left and they don't have default values. */
9421 if (parms && parms != void_list_node
9422 && TREE_PURPOSE (parms) == NULL_TREE)
9426 for (i = 0; i < ntparms; i++)
9427 if (!TREE_VEC_ELT (targs, i))
9429 tree tparm = TREE_VALUE (TREE_VEC_ELT (tparms, i));
9431 /* If this is an undeduced nontype parameter that depends on
9432 a type parameter, try another pass; its type may have been
9433 deduced from a later argument than the one from which
9434 this parameter can be deduced. */
9435 if (TREE_CODE (tparm) == PARM_DECL
9436 && uses_template_parms (TREE_TYPE (tparm))
9437 && !saw_undeduced++)
9440 if (!allow_incomplete)
9441 error ("incomplete type unification");
9448 /* Subroutine of type_unification_real. Args are like the variables at the
9449 call site. ARG is an overloaded function (or template-id); we try
9450 deducing template args from each of the overloads, and if only one
9451 succeeds, we go with that. Modifies TARGS and returns 0 on success. */
9454 resolve_overloaded_unification (tree tparms,
9458 unification_kind_t strict,
9461 tree tempargs = copy_node (targs);
9465 if (TREE_CODE (arg) == ADDR_EXPR)
9467 arg = TREE_OPERAND (arg, 0);
9473 if (TREE_CODE (arg) == COMPONENT_REF)
9474 /* Handle `&x' where `x' is some static or non-static member
9476 arg = TREE_OPERAND (arg, 1);
9478 if (TREE_CODE (arg) == OFFSET_REF)
9479 arg = TREE_OPERAND (arg, 1);
9481 /* Strip baselink information. */
9482 if (BASELINK_P (arg))
9483 arg = BASELINK_FUNCTIONS (arg);
9485 if (TREE_CODE (arg) == TEMPLATE_ID_EXPR)
9487 /* If we got some explicit template args, we need to plug them into
9488 the affected templates before we try to unify, in case the
9489 explicit args will completely resolve the templates in question. */
9491 tree expl_subargs = TREE_OPERAND (arg, 1);
9492 arg = TREE_OPERAND (arg, 0);
9494 for (; arg; arg = OVL_NEXT (arg))
9496 tree fn = OVL_CURRENT (arg);
9499 if (TREE_CODE (fn) != TEMPLATE_DECL)
9502 subargs = get_bindings (fn, DECL_TEMPLATE_RESULT (fn),
9503 expl_subargs, /*check_ret=*/false);
9506 elem = tsubst (TREE_TYPE (fn), subargs, tf_none, NULL_TREE);
9507 good += try_one_overload (tparms, targs, tempargs, parm,
9508 elem, strict, sub_strict, addr_p);
9514 gcc_assert (TREE_CODE (arg) == OVERLOAD
9515 || TREE_CODE (arg) == FUNCTION_DECL);
9517 for (; arg; arg = OVL_NEXT (arg))
9518 good += try_one_overload (tparms, targs, tempargs, parm,
9519 TREE_TYPE (OVL_CURRENT (arg)),
9520 strict, sub_strict, addr_p);
9523 /* [temp.deduct.type] A template-argument can be deduced from a pointer
9524 to function or pointer to member function argument if the set of
9525 overloaded functions does not contain function templates and at most
9526 one of a set of overloaded functions provides a unique match.
9528 So if we found multiple possibilities, we return success but don't
9533 int i = TREE_VEC_LENGTH (targs);
9535 if (TREE_VEC_ELT (tempargs, i))
9536 TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i);
9544 /* Subroutine of resolve_overloaded_unification; does deduction for a single
9545 overload. Fills TARGS with any deduced arguments, or error_mark_node if
9546 different overloads deduce different arguments for a given parm.
9547 ADDR_P is true if the expression for which deduction is being
9548 performed was of the form "& fn" rather than simply "fn".
9550 Returns 1 on success. */
9553 try_one_overload (tree tparms,
9558 unification_kind_t strict,
9566 /* [temp.deduct.type] A template-argument can be deduced from a pointer
9567 to function or pointer to member function argument if the set of
9568 overloaded functions does not contain function templates and at most
9569 one of a set of overloaded functions provides a unique match.
9571 So if this is a template, just return success. */
9573 if (uses_template_parms (arg))
9576 if (TREE_CODE (arg) == METHOD_TYPE)
9577 arg = build_ptrmemfunc_type (build_pointer_type (arg));
9579 arg = build_pointer_type (arg);
9581 sub_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg);
9583 /* We don't copy orig_targs for this because if we have already deduced
9584 some template args from previous args, unify would complain when we
9585 try to deduce a template parameter for the same argument, even though
9586 there isn't really a conflict. */
9587 nargs = TREE_VEC_LENGTH (targs);
9588 tempargs = make_tree_vec (nargs);
9590 if (unify (tparms, tempargs, parm, arg, sub_strict) != 0)
9593 /* First make sure we didn't deduce anything that conflicts with
9594 explicitly specified args. */
9595 for (i = nargs; i--; )
9597 tree elt = TREE_VEC_ELT (tempargs, i);
9598 tree oldelt = TREE_VEC_ELT (orig_targs, i);
9602 else if (uses_template_parms (elt))
9603 /* Since we're unifying against ourselves, we will fill in
9604 template args used in the function parm list with our own
9605 template parms. Discard them. */
9606 TREE_VEC_ELT (tempargs, i) = NULL_TREE;
9607 else if (oldelt && !template_args_equal (oldelt, elt))
9611 for (i = nargs; i--; )
9613 tree elt = TREE_VEC_ELT (tempargs, i);
9616 TREE_VEC_ELT (targs, i) = elt;
9622 /* Verify that nondeduce template argument agrees with the type
9623 obtained from argument deduction. Return nonzero if the
9628 struct A { typedef int X; };
9629 template <class T, class U> struct C {};
9630 template <class T> struct C<T, typename T::X> {};
9632 Then with the instantiation `C<A, int>', we can deduce that
9633 `T' is `A' but unify () does not check whether `typename T::X'
9634 is `int'. This function ensure that they agree.
9636 TARGS, PARMS are the same as the arguments of unify.
9637 ARGS contains template arguments from all levels. */
9640 verify_class_unification (tree targs, tree parms, tree args)
9642 parms = tsubst (parms, add_outermost_template_args (args, targs),
9643 tf_none, NULL_TREE);
9644 if (parms == error_mark_node)
9647 return !comp_template_args (parms, INNERMOST_TEMPLATE_ARGS (args));
9650 /* PARM is a template class (perhaps with unbound template
9651 parameters). ARG is a fully instantiated type. If ARG can be
9652 bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and
9653 TARGS are as for unify. */
9656 try_class_unification (tree tparms, tree targs, tree parm, tree arg)
9660 if (!CLASSTYPE_TEMPLATE_INFO (arg)
9661 || (most_general_template (CLASSTYPE_TI_TEMPLATE (arg))
9662 != most_general_template (CLASSTYPE_TI_TEMPLATE (parm))))
9665 /* We need to make a new template argument vector for the call to
9666 unify. If we used TARGS, we'd clutter it up with the result of
9667 the attempted unification, even if this class didn't work out.
9668 We also don't want to commit ourselves to all the unifications
9669 we've already done, since unification is supposed to be done on
9670 an argument-by-argument basis. In other words, consider the
9671 following pathological case:
9673 template <int I, int J, int K>
9676 template <int I, int J>
9677 struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {};
9679 template <int I, int J, int K>
9680 void f(S<I, J, K>, S<I, I, I>);
9689 Now, by the time we consider the unification involving `s2', we
9690 already know that we must have `f<0, 0, 0>'. But, even though
9691 `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is invalid
9692 because there are two ways to unify base classes of S<0, 1, 2>
9693 with S<I, I, I>. If we kept the already deduced knowledge, we
9694 would reject the possibility I=1. */
9695 copy_of_targs = make_tree_vec (TREE_VEC_LENGTH (targs));
9697 /* If unification failed, we're done. */
9698 if (unify (tparms, copy_of_targs, CLASSTYPE_TI_ARGS (parm),
9699 CLASSTYPE_TI_ARGS (arg), UNIFY_ALLOW_NONE))
9705 /* Given a template type PARM and a class type ARG, find the unique
9706 base type in ARG that is an instance of PARM. We do not examine
9707 ARG itself; only its base-classes. If there is not exactly one
9708 appropriate base class, return NULL_TREE. PARM may be the type of
9709 a partial specialization, as well as a plain template type. Used
9713 get_template_base (tree tparms, tree targs, tree parm, tree arg)
9715 tree rval = NULL_TREE;
9718 gcc_assert (IS_AGGR_TYPE_CODE (TREE_CODE (arg)));
9720 binfo = TYPE_BINFO (complete_type (arg));
9722 /* The type could not be completed. */
9725 /* Walk in inheritance graph order. The search order is not
9726 important, and this avoids multiple walks of virtual bases. */
9727 for (binfo = TREE_CHAIN (binfo); binfo; binfo = TREE_CHAIN (binfo))
9729 tree r = try_class_unification (tparms, targs, parm, BINFO_TYPE (binfo));
9733 /* If there is more than one satisfactory baseclass, then:
9737 If they yield more than one possible deduced A, the type
9741 if (rval && !same_type_p (r, rval))
9751 /* Returns the level of DECL, which declares a template parameter. */
9754 template_decl_level (tree decl)
9756 switch (TREE_CODE (decl))
9760 return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl));
9763 return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl));
9771 /* Decide whether ARG can be unified with PARM, considering only the
9772 cv-qualifiers of each type, given STRICT as documented for unify.
9773 Returns nonzero iff the unification is OK on that basis. */
9776 check_cv_quals_for_unify (int strict, tree arg, tree parm)
9778 int arg_quals = cp_type_quals (arg);
9779 int parm_quals = cp_type_quals (parm);
9781 if (TREE_CODE (parm) == TEMPLATE_TYPE_PARM
9782 && !(strict & UNIFY_ALLOW_OUTER_MORE_CV_QUAL))
9784 /* Although a CVR qualifier is ignored when being applied to a
9785 substituted template parameter ([8.3.2]/1 for example), that
9786 does not apply during deduction [14.8.2.4]/1, (even though
9787 that is not explicitly mentioned, [14.8.2.4]/9 indicates
9788 this). Except when we're allowing additional CV qualifiers
9789 at the outer level [14.8.2.1]/3,1st bullet. */
9790 if ((TREE_CODE (arg) == REFERENCE_TYPE
9791 || TREE_CODE (arg) == FUNCTION_TYPE
9792 || TREE_CODE (arg) == METHOD_TYPE)
9793 && (parm_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)))
9796 if ((!POINTER_TYPE_P (arg) && TREE_CODE (arg) != TEMPLATE_TYPE_PARM)
9797 && (parm_quals & TYPE_QUAL_RESTRICT))
9801 if (!(strict & (UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_OUTER_MORE_CV_QUAL))
9802 && (arg_quals & parm_quals) != parm_quals)
9805 if (!(strict & (UNIFY_ALLOW_LESS_CV_QUAL | UNIFY_ALLOW_OUTER_LESS_CV_QUAL))
9806 && (parm_quals & arg_quals) != arg_quals)
9812 /* Takes parameters as for type_unification. Returns 0 if the
9813 type deduction succeeds, 1 otherwise. The parameter STRICT is a
9814 bitwise or of the following flags:
9817 Require an exact match between PARM and ARG.
9818 UNIFY_ALLOW_MORE_CV_QUAL:
9819 Allow the deduced ARG to be more cv-qualified (by qualification
9820 conversion) than ARG.
9821 UNIFY_ALLOW_LESS_CV_QUAL:
9822 Allow the deduced ARG to be less cv-qualified than ARG.
9823 UNIFY_ALLOW_DERIVED:
9824 Allow the deduced ARG to be a template base class of ARG,
9825 or a pointer to a template base class of the type pointed to by
9827 UNIFY_ALLOW_INTEGER:
9828 Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX
9829 case for more information.
9830 UNIFY_ALLOW_OUTER_LEVEL:
9831 This is the outermost level of a deduction. Used to determine validity
9832 of qualification conversions. A valid qualification conversion must
9833 have const qualified pointers leading up to the inner type which
9834 requires additional CV quals, except at the outer level, where const
9835 is not required [conv.qual]. It would be normal to set this flag in
9836 addition to setting UNIFY_ALLOW_MORE_CV_QUAL.
9837 UNIFY_ALLOW_OUTER_MORE_CV_QUAL:
9838 This is the outermost level of a deduction, and PARM can be more CV
9839 qualified at this point.
9840 UNIFY_ALLOW_OUTER_LESS_CV_QUAL:
9841 This is the outermost level of a deduction, and PARM can be less CV
9842 qualified at this point. */
9845 unify (tree tparms, tree targs, tree parm, tree arg, int strict)
9850 int strict_in = strict;
9852 /* I don't think this will do the right thing with respect to types.
9853 But the only case I've seen it in so far has been array bounds, where
9854 signedness is the only information lost, and I think that will be
9856 while (TREE_CODE (parm) == NOP_EXPR)
9857 parm = TREE_OPERAND (parm, 0);
9859 if (arg == error_mark_node)
9861 if (arg == unknown_type_node)
9862 /* We can't deduce anything from this, but we might get all the
9863 template args from other function args. */
9866 /* If PARM uses template parameters, then we can't bail out here,
9867 even if ARG == PARM, since we won't record unifications for the
9868 template parameters. We might need them if we're trying to
9869 figure out which of two things is more specialized. */
9870 if (arg == parm && !uses_template_parms (parm))
9873 /* Immediately reject some pairs that won't unify because of
9874 cv-qualification mismatches. */
9875 if (TREE_CODE (arg) == TREE_CODE (parm)
9877 /* It is the elements of the array which hold the cv quals of an array
9878 type, and the elements might be template type parms. We'll check
9880 && TREE_CODE (arg) != ARRAY_TYPE
9881 /* We check the cv-qualifiers when unifying with template type
9882 parameters below. We want to allow ARG `const T' to unify with
9883 PARM `T' for example, when computing which of two templates
9884 is more specialized, for example. */
9885 && TREE_CODE (arg) != TEMPLATE_TYPE_PARM
9886 && !check_cv_quals_for_unify (strict_in, arg, parm))
9889 if (!(strict & UNIFY_ALLOW_OUTER_LEVEL)
9890 && TYPE_P (parm) && !CP_TYPE_CONST_P (parm))
9891 strict &= ~UNIFY_ALLOW_MORE_CV_QUAL;
9892 strict &= ~UNIFY_ALLOW_OUTER_LEVEL;
9893 strict &= ~UNIFY_ALLOW_DERIVED;
9894 strict &= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL;
9895 strict &= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL;
9897 switch (TREE_CODE (parm))
9901 case UNBOUND_CLASS_TEMPLATE:
9902 /* In a type which contains a nested-name-specifier, template
9903 argument values cannot be deduced for template parameters used
9904 within the nested-name-specifier. */
9907 case TEMPLATE_TYPE_PARM:
9908 case TEMPLATE_TEMPLATE_PARM:
9909 case BOUND_TEMPLATE_TEMPLATE_PARM:
9910 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0));
9912 if (TEMPLATE_TYPE_LEVEL (parm)
9913 != template_decl_level (tparm))
9914 /* The PARM is not one we're trying to unify. Just check
9915 to see if it matches ARG. */
9916 return (TREE_CODE (arg) == TREE_CODE (parm)
9917 && same_type_p (parm, arg)) ? 0 : 1;
9918 idx = TEMPLATE_TYPE_IDX (parm);
9919 targ = TREE_VEC_ELT (targs, idx);
9920 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx));
9922 /* Check for mixed types and values. */
9923 if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM
9924 && TREE_CODE (tparm) != TYPE_DECL)
9925 || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM
9926 && TREE_CODE (tparm) != TEMPLATE_DECL))
9929 if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
9931 /* ARG must be constructed from a template class or a template
9932 template parameter. */
9933 if (TREE_CODE (arg) != BOUND_TEMPLATE_TEMPLATE_PARM
9934 && (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg)))
9938 tree parmtmpl = TYPE_TI_TEMPLATE (parm);
9939 tree parmvec = TYPE_TI_ARGS (parm);
9940 tree argvec = INNERMOST_TEMPLATE_ARGS (TYPE_TI_ARGS (arg));
9942 = DECL_INNERMOST_TEMPLATE_PARMS (TYPE_TI_TEMPLATE (arg));
9945 /* The parameter and argument roles have to be switched here
9946 in order to handle default arguments properly. For example,
9947 template<template <class> class TT> void f(TT<int>)
9948 should be able to accept vector<int> which comes from
9949 template <class T, class Allocator = allocator>
9952 if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 0, 1)
9956 /* Deduce arguments T, i from TT<T> or TT<i>.
9957 We check each element of PARMVEC and ARGVEC individually
9958 rather than the whole TREE_VEC since they can have
9959 different number of elements. */
9961 for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i)
9963 if (unify (tparms, targs,
9964 TREE_VEC_ELT (parmvec, i),
9965 TREE_VEC_ELT (argvec, i),
9970 arg = TYPE_TI_TEMPLATE (arg);
9972 /* Fall through to deduce template name. */
9975 if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM
9976 || TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
9978 /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */
9980 /* Simple cases: Value already set, does match or doesn't. */
9981 if (targ != NULL_TREE && template_args_equal (targ, arg))
9988 /* If PARM is `const T' and ARG is only `int', we don't have
9989 a match unless we are allowing additional qualification.
9990 If ARG is `const int' and PARM is just `T' that's OK;
9991 that binds `const int' to `T'. */
9992 if (!check_cv_quals_for_unify (strict_in | UNIFY_ALLOW_LESS_CV_QUAL,
9996 /* Consider the case where ARG is `const volatile int' and
9997 PARM is `const T'. Then, T should be `volatile int'. */
9998 arg = cp_build_qualified_type_real
9999 (arg, cp_type_quals (arg) & ~cp_type_quals (parm), tf_none);
10000 if (arg == error_mark_node)
10003 /* Simple cases: Value already set, does match or doesn't. */
10004 if (targ != NULL_TREE && same_type_p (targ, arg))
10009 /* Make sure that ARG is not a variable-sized array. (Note
10010 that were talking about variable-sized arrays (like
10011 `int[n]'), rather than arrays of unknown size (like
10012 `int[]').) We'll get very confused by such a type since
10013 the bound of the array will not be computable in an
10014 instantiation. Besides, such types are not allowed in
10015 ISO C++, so we can do as we please here. */
10016 if (variably_modified_type_p (arg, NULL_TREE))
10020 TREE_VEC_ELT (targs, idx) = arg;
10023 case TEMPLATE_PARM_INDEX:
10024 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0));
10026 if (TEMPLATE_PARM_LEVEL (parm)
10027 != template_decl_level (tparm))
10028 /* The PARM is not one we're trying to unify. Just check
10029 to see if it matches ARG. */
10030 return !(TREE_CODE (arg) == TREE_CODE (parm)
10031 && cp_tree_equal (parm, arg));
10033 idx = TEMPLATE_PARM_IDX (parm);
10034 targ = TREE_VEC_ELT (targs, idx);
10037 return !cp_tree_equal (targ, arg);
10039 /* [temp.deduct.type] If, in the declaration of a function template
10040 with a non-type template-parameter, the non-type
10041 template-parameter is used in an expression in the function
10042 parameter-list and, if the corresponding template-argument is
10043 deduced, the template-argument type shall match the type of the
10044 template-parameter exactly, except that a template-argument
10045 deduced from an array bound may be of any integral type.
10046 The non-type parameter might use already deduced type parameters. */
10047 tparm = tsubst (TREE_TYPE (parm), targs, 0, NULL_TREE);
10048 if (!TREE_TYPE (arg))
10049 /* Template-parameter dependent expression. Just accept it for now.
10050 It will later be processed in convert_template_argument. */
10052 else if (same_type_p (TREE_TYPE (arg), tparm))
10054 else if ((strict & UNIFY_ALLOW_INTEGER)
10055 && (TREE_CODE (tparm) == INTEGER_TYPE
10056 || TREE_CODE (tparm) == BOOLEAN_TYPE))
10057 /* Convert the ARG to the type of PARM; the deduced non-type
10058 template argument must exactly match the types of the
10059 corresponding parameter. */
10060 arg = fold (build_nop (TREE_TYPE (parm), arg));
10061 else if (uses_template_parms (tparm))
10062 /* We haven't deduced the type of this parameter yet. Try again
10068 TREE_VEC_ELT (targs, idx) = arg;
10073 /* A pointer-to-member constant can be unified only with
10074 another constant. */
10075 if (TREE_CODE (arg) != PTRMEM_CST)
10078 /* Just unify the class member. It would be useless (and possibly
10079 wrong, depending on the strict flags) to unify also
10080 PTRMEM_CST_CLASS, because we want to be sure that both parm and
10081 arg refer to the same variable, even if through different
10082 classes. For instance:
10084 struct A { int x; };
10087 Unification of &A::x and &B::x must succeed. */
10088 return unify (tparms, targs, PTRMEM_CST_MEMBER (parm),
10089 PTRMEM_CST_MEMBER (arg), strict);
10094 if (TREE_CODE (arg) != POINTER_TYPE)
10097 /* [temp.deduct.call]
10099 A can be another pointer or pointer to member type that can
10100 be converted to the deduced A via a qualification
10101 conversion (_conv.qual_).
10103 We pass down STRICT here rather than UNIFY_ALLOW_NONE.
10104 This will allow for additional cv-qualification of the
10105 pointed-to types if appropriate. */
10107 if (TREE_CODE (TREE_TYPE (arg)) == RECORD_TYPE)
10108 /* The derived-to-base conversion only persists through one
10109 level of pointers. */
10110 strict |= (strict_in & UNIFY_ALLOW_DERIVED);
10112 return unify (tparms, targs, TREE_TYPE (parm),
10113 TREE_TYPE (arg), strict);
10116 case REFERENCE_TYPE:
10117 if (TREE_CODE (arg) != REFERENCE_TYPE)
10119 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
10120 strict & UNIFY_ALLOW_MORE_CV_QUAL);
10123 if (TREE_CODE (arg) != ARRAY_TYPE)
10125 if ((TYPE_DOMAIN (parm) == NULL_TREE)
10126 != (TYPE_DOMAIN (arg) == NULL_TREE))
10128 if (TYPE_DOMAIN (parm) != NULL_TREE)
10133 parm_max = TYPE_MAX_VALUE (TYPE_DOMAIN (parm));
10134 arg_max = TYPE_MAX_VALUE (TYPE_DOMAIN (arg));
10136 /* Our representation of array types uses "N - 1" as the
10137 TYPE_MAX_VALUE for an array with "N" elements, if "N" is
10138 not an integer constant. */
10139 if (TREE_CODE (parm_max) == MINUS_EXPR)
10141 arg_max = fold_build2 (PLUS_EXPR,
10144 TREE_OPERAND (parm_max, 1));
10145 parm_max = TREE_OPERAND (parm_max, 0);
10148 if (unify (tparms, targs, parm_max, arg_max, UNIFY_ALLOW_INTEGER))
10151 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
10152 strict & UNIFY_ALLOW_MORE_CV_QUAL);
10159 case ENUMERAL_TYPE:
10161 if (TREE_CODE (arg) != TREE_CODE (parm))
10164 /* We have already checked cv-qualification at the top of the
10166 if (!same_type_ignoring_top_level_qualifiers_p (arg, parm))
10169 /* As far as unification is concerned, this wins. Later checks
10170 will invalidate it if necessary. */
10173 /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */
10174 /* Type INTEGER_CST can come from ordinary constant template args. */
10176 while (TREE_CODE (arg) == NOP_EXPR)
10177 arg = TREE_OPERAND (arg, 0);
10179 if (TREE_CODE (arg) != INTEGER_CST)
10181 return !tree_int_cst_equal (parm, arg);
10186 if (TREE_CODE (arg) != TREE_VEC)
10188 if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg))
10190 for (i = 0; i < TREE_VEC_LENGTH (parm); ++i)
10191 if (unify (tparms, targs,
10192 TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i),
10200 if (TREE_CODE (arg) != TREE_CODE (parm))
10203 if (TYPE_PTRMEMFUNC_P (parm))
10205 if (!TYPE_PTRMEMFUNC_P (arg))
10208 return unify (tparms, targs,
10209 TYPE_PTRMEMFUNC_FN_TYPE (parm),
10210 TYPE_PTRMEMFUNC_FN_TYPE (arg),
10214 if (CLASSTYPE_TEMPLATE_INFO (parm))
10216 tree t = NULL_TREE;
10218 if (strict_in & UNIFY_ALLOW_DERIVED)
10220 /* First, we try to unify the PARM and ARG directly. */
10221 t = try_class_unification (tparms, targs,
10226 /* Fallback to the special case allowed in
10227 [temp.deduct.call]:
10229 If P is a class, and P has the form
10230 template-id, then A can be a derived class of
10231 the deduced A. Likewise, if P is a pointer to
10232 a class of the form template-id, A can be a
10233 pointer to a derived class pointed to by the
10235 t = get_template_base (tparms, targs, parm, arg);
10241 else if (CLASSTYPE_TEMPLATE_INFO (arg)
10242 && (CLASSTYPE_TI_TEMPLATE (parm)
10243 == CLASSTYPE_TI_TEMPLATE (arg)))
10244 /* Perhaps PARM is something like S<U> and ARG is S<int>.
10245 Then, we should unify `int' and `U'. */
10248 /* There's no chance of unification succeeding. */
10251 return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm),
10252 CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE);
10254 else if (!same_type_ignoring_top_level_qualifiers_p (parm, arg))
10259 case FUNCTION_TYPE:
10260 if (TREE_CODE (arg) != TREE_CODE (parm))
10263 if (unify (tparms, targs, TREE_TYPE (parm),
10264 TREE_TYPE (arg), UNIFY_ALLOW_NONE))
10266 return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm),
10267 TYPE_ARG_TYPES (arg), 1,
10271 /* Unify a pointer to member with a pointer to member function, which
10272 deduces the type of the member as a function type. */
10273 if (TYPE_PTRMEMFUNC_P (arg))
10277 cp_cv_quals cv_quals;
10279 /* Check top-level cv qualifiers */
10280 if (!check_cv_quals_for_unify (UNIFY_ALLOW_NONE, arg, parm))
10283 if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm),
10284 TYPE_PTRMEMFUNC_OBJECT_TYPE (arg), UNIFY_ALLOW_NONE))
10287 /* Determine the type of the function we are unifying against. */
10288 method_type = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (arg));
10290 build_function_type (TREE_TYPE (method_type),
10291 TREE_CHAIN (TYPE_ARG_TYPES (method_type)));
10293 /* Extract the cv-qualifiers of the member function from the
10294 implicit object parameter and place them on the function
10295 type to be restored later. */
10297 cp_type_quals(TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (method_type))));
10298 fntype = build_qualified_type (fntype, cv_quals);
10299 return unify (tparms, targs, TREE_TYPE (parm), fntype, strict);
10302 if (TREE_CODE (arg) != OFFSET_TYPE)
10304 if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm),
10305 TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE))
10307 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
10311 if (DECL_TEMPLATE_PARM_P (parm))
10312 return unify (tparms, targs, DECL_INITIAL (parm), arg, strict);
10313 if (arg != integral_constant_value (parm))
10318 case TEMPLATE_DECL:
10319 /* Matched cases are handled by the ARG == PARM test above. */
10323 gcc_assert (EXPR_P (parm));
10325 /* We must be looking at an expression. This can happen with
10329 void foo(S<I>, S<I + 2>);
10331 This is a "nondeduced context":
10335 The nondeduced contexts are:
10337 --A type that is a template-id in which one or more of
10338 the template-arguments is an expression that references
10339 a template-parameter.
10341 In these cases, we assume deduction succeeded, but don't
10342 actually infer any unifications. */
10344 if (!uses_template_parms (parm)
10345 && !template_args_equal (parm, arg))
10352 /* Note that DECL can be defined in this translation unit, if
10356 mark_definable (tree decl)
10359 DECL_NOT_REALLY_EXTERN (decl) = 1;
10360 FOR_EACH_CLONE (clone, decl)
10361 DECL_NOT_REALLY_EXTERN (clone) = 1;
10364 /* Called if RESULT is explicitly instantiated, or is a member of an
10365 explicitly instantiated class. */
10368 mark_decl_instantiated (tree result, int extern_p)
10370 SET_DECL_EXPLICIT_INSTANTIATION (result);
10372 /* If this entity has already been written out, it's too late to
10373 make any modifications. */
10374 if (TREE_ASM_WRITTEN (result))
10377 if (TREE_CODE (result) != FUNCTION_DECL)
10378 /* The TREE_PUBLIC flag for function declarations will have been
10379 set correctly by tsubst. */
10380 TREE_PUBLIC (result) = 1;
10382 /* This might have been set by an earlier implicit instantiation. */
10383 DECL_COMDAT (result) = 0;
10386 DECL_NOT_REALLY_EXTERN (result) = 0;
10389 mark_definable (result);
10390 /* Always make artificials weak. */
10391 if (DECL_ARTIFICIAL (result) && flag_weak)
10392 comdat_linkage (result);
10393 /* For WIN32 we also want to put explicit instantiations in
10394 linkonce sections. */
10395 else if (TREE_PUBLIC (result))
10396 maybe_make_one_only (result);
10399 /* If EXTERN_P, then this function will not be emitted -- unless
10400 followed by an explicit instantiation, at which point its linkage
10401 will be adjusted. If !EXTERN_P, then this function will be
10402 emitted here. In neither circumstance do we want
10403 import_export_decl to adjust the linkage. */
10404 DECL_INTERFACE_KNOWN (result) = 1;
10407 /* Given two function templates PAT1 and PAT2, return:
10409 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order].
10410 -1 if PAT2 is more specialized than PAT1.
10411 0 if neither is more specialized.
10413 LEN indicates the number of parameters we should consider
10414 (defaulted parameters should not be considered).
10416 The 1998 std underspecified function template partial ordering, and
10417 DR214 addresses the issue. We take pairs of arguments, one from
10418 each of the templates, and deduce them against each other. One of
10419 the templates will be more specialized if all the *other*
10420 template's arguments deduce against its arguments and at least one
10421 of its arguments *does* *not* deduce against the other template's
10422 corresponding argument. Deduction is done as for class templates.
10423 The arguments used in deduction have reference and top level cv
10424 qualifiers removed. Iff both arguments were originally reference
10425 types *and* deduction succeeds in both directions, the template
10426 with the more cv-qualified argument wins for that pairing (if
10427 neither is more cv-qualified, they both are equal). Unlike regular
10428 deduction, after all the arguments have been deduced in this way,
10429 we do *not* verify the deduced template argument values can be
10430 substituted into non-deduced contexts, nor do we have to verify
10431 that all template arguments have been deduced. */
10434 more_specialized_fn (tree pat1, tree pat2, int len)
10436 tree decl1 = DECL_TEMPLATE_RESULT (pat1);
10437 tree decl2 = DECL_TEMPLATE_RESULT (pat2);
10438 tree targs1 = make_tree_vec (DECL_NTPARMS (pat1));
10439 tree targs2 = make_tree_vec (DECL_NTPARMS (pat2));
10440 tree tparms1 = DECL_INNERMOST_TEMPLATE_PARMS (pat1);
10441 tree tparms2 = DECL_INNERMOST_TEMPLATE_PARMS (pat2);
10442 tree args1 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
10443 tree args2 = TYPE_ARG_TYPES (TREE_TYPE (decl2));
10447 /* If only one is a member function, they are unordered. */
10448 if (DECL_FUNCTION_MEMBER_P (decl1) != DECL_FUNCTION_MEMBER_P (decl2))
10451 /* Don't consider 'this' parameter. */
10452 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl1))
10453 args1 = TREE_CHAIN (args1);
10454 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl2))
10455 args2 = TREE_CHAIN (args2);
10457 /* If only one is a conversion operator, they are unordered. */
10458 if (DECL_CONV_FN_P (decl1) != DECL_CONV_FN_P (decl2))
10461 /* Consider the return type for a conversion function */
10462 if (DECL_CONV_FN_P (decl1))
10464 args1 = tree_cons (NULL_TREE, TREE_TYPE (TREE_TYPE (decl1)), args1);
10465 args2 = tree_cons (NULL_TREE, TREE_TYPE (TREE_TYPE (decl2)), args2);
10469 processing_template_decl++;
10473 tree arg1 = TREE_VALUE (args1);
10474 tree arg2 = TREE_VALUE (args2);
10475 int deduce1, deduce2;
10479 if (TREE_CODE (arg1) == REFERENCE_TYPE)
10481 arg1 = TREE_TYPE (arg1);
10482 quals1 = cp_type_quals (arg1);
10485 if (TREE_CODE (arg2) == REFERENCE_TYPE)
10487 arg2 = TREE_TYPE (arg2);
10488 quals2 = cp_type_quals (arg2);
10491 if ((quals1 < 0) != (quals2 < 0))
10493 /* Only of the args is a reference, see if we should apply
10494 array/function pointer decay to it. This is not part of
10495 DR214, but is, IMHO, consistent with the deduction rules
10496 for the function call itself, and with our earlier
10497 implementation of the underspecified partial ordering
10498 rules. (nathan). */
10501 switch (TREE_CODE (arg1))
10504 arg1 = TREE_TYPE (arg1);
10506 case FUNCTION_TYPE:
10507 arg1 = build_pointer_type (arg1);
10516 switch (TREE_CODE (arg2))
10519 arg2 = TREE_TYPE (arg2);
10521 case FUNCTION_TYPE:
10522 arg2 = build_pointer_type (arg2);
10531 arg1 = TYPE_MAIN_VARIANT (arg1);
10532 arg2 = TYPE_MAIN_VARIANT (arg2);
10534 deduce1 = !unify (tparms1, targs1, arg1, arg2, UNIFY_ALLOW_NONE);
10535 deduce2 = !unify (tparms2, targs2, arg2, arg1, UNIFY_ALLOW_NONE);
10541 if (better1 < 0 && better2 < 0)
10542 /* We've failed to deduce something in either direction.
10543 These must be unordered. */
10546 if (deduce1 && deduce2 && quals1 >= 0 && quals2 >= 0)
10548 /* Deduces in both directions, see if quals can
10549 disambiguate. Pretend the worse one failed to deduce. */
10550 if ((quals1 & quals2) == quals2)
10552 if ((quals1 & quals2) == quals1)
10555 if (deduce1 && !deduce2 && !better2)
10557 if (deduce2 && !deduce1 && !better1)
10560 args1 = TREE_CHAIN (args1);
10561 args2 = TREE_CHAIN (args2);
10564 processing_template_decl--;
10566 return (better1 > 0) - (better2 > 0);
10569 /* Given two class template specialization list nodes PAT1 and PAT2, return:
10571 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order].
10572 -1 if PAT2 is more specialized than PAT1.
10573 0 if neither is more specialized.
10575 FULL_ARGS is the full set of template arguments that triggers this
10576 partial ordering. */
10579 more_specialized_class (tree pat1, tree pat2, tree full_args)
10584 /* Just like what happens for functions, if we are ordering between
10585 different class template specializations, we may encounter dependent
10586 types in the arguments, and we need our dependency check functions
10587 to behave correctly. */
10588 ++processing_template_decl;
10589 targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1),
10590 add_outermost_template_args (full_args, TREE_PURPOSE (pat2)));
10594 targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2),
10595 add_outermost_template_args (full_args, TREE_PURPOSE (pat1)));
10598 --processing_template_decl;
10603 /* Return the template arguments that will produce the function signature
10604 DECL from the function template FN, with the explicit template
10605 arguments EXPLICIT_ARGS. If CHECK_RETTYPE is true, the return type must
10606 also match. Return NULL_TREE if no satisfactory arguments could be
10610 get_bindings (tree fn, tree decl, tree explicit_args, bool check_rettype)
10612 int ntparms = DECL_NTPARMS (fn);
10613 tree targs = make_tree_vec (ntparms);
10615 tree decl_arg_types;
10617 /* Substitute the explicit template arguments into the type of DECL.
10618 The call to fn_type_unification will handle substitution into the
10620 decl_type = TREE_TYPE (decl);
10621 if (explicit_args && uses_template_parms (decl_type))
10624 tree converted_args;
10626 if (DECL_TEMPLATE_INFO (decl))
10627 tmpl = DECL_TI_TEMPLATE (decl);
10629 /* We can get here for some invalid specializations. */
10633 = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl),
10634 explicit_args, NULL_TREE,
10635 tf_none, /*require_all_arguments=*/0));
10636 if (converted_args == error_mark_node)
10639 decl_type = tsubst (decl_type, converted_args, tf_none, NULL_TREE);
10640 if (decl_type == error_mark_node)
10644 decl_arg_types = TYPE_ARG_TYPES (decl_type);
10645 /* Never do unification on the 'this' parameter. */
10646 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10647 decl_arg_types = TREE_CHAIN (decl_arg_types);
10649 if (fn_type_unification (fn, explicit_args, targs,
10651 (check_rettype || DECL_CONV_FN_P (fn)
10652 ? TREE_TYPE (decl_type) : NULL_TREE),
10659 /* Return the innermost template arguments that, when applied to a
10660 template specialization whose innermost template parameters are
10661 TPARMS, and whose specialization arguments are PARMS, yield the
10664 For example, suppose we have:
10666 template <class T, class U> struct S {};
10667 template <class T> struct S<T*, int> {};
10669 Then, suppose we want to get `S<double*, int>'. The TPARMS will be
10670 {T}, the PARMS will be {T*, int} and the ARGS will be {double*,
10671 int}. The resulting vector will be {double}, indicating that `T'
10672 is bound to `double'. */
10675 get_class_bindings (tree tparms, tree parms, tree args)
10677 int i, ntparms = TREE_VEC_LENGTH (tparms);
10678 tree vec = make_tree_vec (ntparms);
10680 if (unify (tparms, vec, parms, INNERMOST_TEMPLATE_ARGS (args),
10684 for (i = 0; i < ntparms; ++i)
10685 if (! TREE_VEC_ELT (vec, i))
10688 if (verify_class_unification (vec, parms, args))
10694 /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs.
10695 Pick the most specialized template, and return the corresponding
10696 instantiation, or if there is no corresponding instantiation, the
10697 template itself. If there is no most specialized template,
10698 error_mark_node is returned. If there are no templates at all,
10699 NULL_TREE is returned. */
10702 most_specialized_instantiation (tree instantiations)
10706 if (!instantiations)
10709 ++processing_template_decl;
10711 champ = instantiations;
10712 for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn))
10716 if (get_bindings (TREE_VALUE (champ),
10717 DECL_TEMPLATE_RESULT (TREE_VALUE (fn)),
10718 NULL_TREE, /*check_ret=*/false))
10721 if (get_bindings (TREE_VALUE (fn),
10722 DECL_TEMPLATE_RESULT (TREE_VALUE (champ)),
10723 NULL_TREE, /*check_ret=*/false))
10729 /* Equally specialized, move to next function. If there
10730 is no next function, nothing's most specialized. */
10731 fn = TREE_CHAIN (fn);
10737 /* Now verify that champ is better than everything earlier in the
10738 instantiation list. */
10739 for (fn = instantiations; fn != champ; fn = TREE_CHAIN (fn))
10740 if (get_bindings (TREE_VALUE (champ),
10741 DECL_TEMPLATE_RESULT (TREE_VALUE (fn)),
10742 NULL_TREE, /*check_ret=*/false)
10743 || !get_bindings (TREE_VALUE (fn),
10744 DECL_TEMPLATE_RESULT (TREE_VALUE (champ)),
10745 NULL_TREE, /*check_ret=*/false))
10751 processing_template_decl--;
10754 return error_mark_node;
10756 return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ);
10759 /* Return the most specialized of the list of templates in FNS that can
10760 produce an instantiation matching DECL, given the explicit template
10761 arguments EXPLICIT_ARGS. */
10764 most_specialized (tree fns, tree decl, tree explicit_args)
10766 tree candidates = NULL_TREE;
10769 for (fn = fns; fn; fn = TREE_CHAIN (fn))
10771 tree candidate = TREE_VALUE (fn);
10773 args = get_bindings (candidate, decl, explicit_args, /*check_ret=*/true);
10775 candidates = tree_cons (NULL_TREE, candidate, candidates);
10778 return most_specialized_instantiation (candidates);
10781 /* If DECL is a specialization of some template, return the most
10782 general such template. Otherwise, returns NULL_TREE.
10784 For example, given:
10786 template <class T> struct S { template <class U> void f(U); };
10788 if TMPL is `template <class U> void S<int>::f(U)' this will return
10789 the full template. This function will not trace past partial
10790 specializations, however. For example, given in addition:
10792 template <class T> struct S<T*> { template <class U> void f(U); };
10794 if TMPL is `template <class U> void S<int*>::f(U)' this will return
10795 `template <class T> template <class U> S<T*>::f(U)'. */
10798 most_general_template (tree decl)
10800 /* If DECL is a FUNCTION_DECL, find the TEMPLATE_DECL of which it is
10801 an immediate specialization. */
10802 if (TREE_CODE (decl) == FUNCTION_DECL)
10804 if (DECL_TEMPLATE_INFO (decl)) {
10805 decl = DECL_TI_TEMPLATE (decl);
10807 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE for a
10808 template friend. */
10809 if (TREE_CODE (decl) != TEMPLATE_DECL)
10815 /* Look for more and more general templates. */
10816 while (DECL_TEMPLATE_INFO (decl))
10818 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE in some cases.
10819 (See cp-tree.h for details.) */
10820 if (TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL)
10823 if (CLASS_TYPE_P (TREE_TYPE (decl))
10824 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl)))
10827 /* Stop if we run into an explicitly specialized class template. */
10828 if (!DECL_NAMESPACE_SCOPE_P (decl)
10829 && DECL_CONTEXT (decl)
10830 && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl)))
10833 decl = DECL_TI_TEMPLATE (decl);
10839 /* Return the most specialized of the class template specializations
10840 of TMPL which can produce an instantiation matching ARGS, or
10841 error_mark_node if the choice is ambiguous. */
10844 most_specialized_class (tree tmpl, tree args)
10846 tree list = NULL_TREE;
10851 tmpl = most_general_template (tmpl);
10852 for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t))
10855 = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args);
10858 list = tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list);
10859 TREE_TYPE (list) = TREE_TYPE (t);
10868 t = TREE_CHAIN (t);
10869 for (; t; t = TREE_CHAIN (t))
10871 fate = more_specialized_class (champ, t, args);
10878 t = TREE_CHAIN (t);
10880 return error_mark_node;
10886 for (t = list; t && t != champ; t = TREE_CHAIN (t))
10888 fate = more_specialized_class (champ, t, args);
10890 return error_mark_node;
10896 /* Explicitly instantiate DECL. */
10899 do_decl_instantiation (tree decl, tree storage)
10901 tree result = NULL_TREE;
10905 /* An error occurred, for which grokdeclarator has already issued
10906 an appropriate message. */
10908 else if (! DECL_LANG_SPECIFIC (decl))
10910 error ("explicit instantiation of non-template %q#D", decl);
10913 else if (TREE_CODE (decl) == VAR_DECL)
10915 /* There is an asymmetry here in the way VAR_DECLs and
10916 FUNCTION_DECLs are handled by grokdeclarator. In the case of
10917 the latter, the DECL we get back will be marked as a
10918 template instantiation, and the appropriate
10919 DECL_TEMPLATE_INFO will be set up. This does not happen for
10920 VAR_DECLs so we do the lookup here. Probably, grokdeclarator
10921 should handle VAR_DECLs as it currently handles
10923 result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, false);
10924 if (!result || TREE_CODE (result) != VAR_DECL)
10926 error ("no matching template for %qD found", decl);
10930 else if (TREE_CODE (decl) != FUNCTION_DECL)
10932 error ("explicit instantiation of %q#D", decl);
10938 /* Check for various error cases. Note that if the explicit
10939 instantiation is valid the RESULT will currently be marked as an
10940 *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set
10941 until we get here. */
10943 if (DECL_TEMPLATE_SPECIALIZATION (result))
10945 /* DR 259 [temp.spec].
10947 Both an explicit instantiation and a declaration of an explicit
10948 specialization shall not appear in a program unless the explicit
10949 instantiation follows a declaration of the explicit specialization.
10951 For a given set of template parameters, if an explicit
10952 instantiation of a template appears after a declaration of an
10953 explicit specialization for that template, the explicit
10954 instantiation has no effect. */
10957 else if (DECL_EXPLICIT_INSTANTIATION (result))
10961 No program shall explicitly instantiate any template more
10964 We check DECL_NOT_REALLY_EXTERN so as not to complain when
10965 the first instantiation was `extern' and the second is not,
10966 and EXTERN_P for the opposite case. */
10967 if (DECL_NOT_REALLY_EXTERN (result) && !extern_p)
10968 pedwarn ("duplicate explicit instantiation of %q#D", result);
10969 /* If an "extern" explicit instantiation follows an ordinary
10970 explicit instantiation, the template is instantiated. */
10974 else if (!DECL_IMPLICIT_INSTANTIATION (result))
10976 error ("no matching template for %qD found", result);
10979 else if (!DECL_TEMPLATE_INFO (result))
10981 pedwarn ("explicit instantiation of non-template %q#D", result);
10985 if (storage == NULL_TREE)
10987 else if (storage == ridpointers[(int) RID_EXTERN])
10989 if (pedantic && !in_system_header)
10990 pedwarn ("ISO C++ forbids the use of %<extern%> on explicit "
10995 error ("storage class %qD applied to template instantiation", storage);
10997 mark_decl_instantiated (result, extern_p);
10999 instantiate_decl (result, /*defer_ok=*/1, /*undefined_ok=*/0);
11003 mark_class_instantiated (tree t, int extern_p)
11005 SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t);
11006 SET_CLASSTYPE_INTERFACE_KNOWN (t);
11007 CLASSTYPE_INTERFACE_ONLY (t) = extern_p;
11008 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p;
11011 CLASSTYPE_DEBUG_REQUESTED (t) = 1;
11012 rest_of_type_compilation (t, 1);
11016 /* Called from do_type_instantiation through binding_table_foreach to
11017 do recursive instantiation for the type bound in ENTRY. */
11019 bt_instantiate_type_proc (binding_entry entry, void *data)
11021 tree storage = *(tree *) data;
11023 if (IS_AGGR_TYPE (entry->type)
11024 && !uses_template_parms (CLASSTYPE_TI_ARGS (entry->type)))
11025 do_type_instantiation (TYPE_MAIN_DECL (entry->type), storage, 0);
11028 /* Called from do_type_instantiation to instantiate a member
11029 (a member function or a static member variable) of an
11030 explicitly instantiated class template. */
11032 instantiate_class_member (tree decl, int extern_p)
11034 mark_decl_instantiated (decl, extern_p);
11036 instantiate_decl (decl, /*defer_ok=*/1, /* undefined_ok=*/1);
11039 /* Perform an explicit instantiation of template class T. STORAGE, if
11040 non-null, is the RID for extern, inline or static. COMPLAIN is
11041 nonzero if this is called from the parser, zero if called recursively,
11042 since the standard is unclear (as detailed below). */
11045 do_type_instantiation (tree t, tree storage, tsubst_flags_t complain)
11050 int previous_instantiation_extern_p = 0;
11052 if (TREE_CODE (t) == TYPE_DECL)
11055 if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t))
11057 error ("explicit instantiation of non-template type %qT", t);
11063 if (!COMPLETE_TYPE_P (t))
11065 if (complain & tf_error)
11066 error ("explicit instantiation of %q#T before definition of template",
11071 if (storage != NULL_TREE)
11073 if (pedantic && !in_system_header)
11074 pedwarn("ISO C++ forbids the use of %qE on explicit instantiations",
11077 if (storage == ridpointers[(int) RID_INLINE])
11079 else if (storage == ridpointers[(int) RID_EXTERN])
11081 else if (storage == ridpointers[(int) RID_STATIC])
11085 error ("storage class %qD applied to template instantiation",
11091 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t))
11093 /* DR 259 [temp.spec].
11095 Both an explicit instantiation and a declaration of an explicit
11096 specialization shall not appear in a program unless the explicit
11097 instantiation follows a declaration of the explicit specialization.
11099 For a given set of template parameters, if an explicit
11100 instantiation of a template appears after a declaration of an
11101 explicit specialization for that template, the explicit
11102 instantiation has no effect. */
11105 else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t))
11109 No program shall explicitly instantiate any template more
11112 If PREVIOUS_INSTANTIATION_EXTERN_P, then the first explicit
11113 instantiation was `extern'. If EXTERN_P then the second is.
11114 These cases are OK. */
11115 previous_instantiation_extern_p = CLASSTYPE_INTERFACE_ONLY (t);
11117 if (!previous_instantiation_extern_p && !extern_p
11118 && (complain & tf_error))
11119 pedwarn ("duplicate explicit instantiation of %q#T", t);
11121 /* If we've already instantiated the template, just return now. */
11122 if (!CLASSTYPE_INTERFACE_ONLY (t))
11126 mark_class_instantiated (t, extern_p);
11134 /* In contrast to implicit instantiation, where only the
11135 declarations, and not the definitions, of members are
11136 instantiated, we have here:
11140 The explicit instantiation of a class template specialization
11141 implies the instantiation of all of its members not
11142 previously explicitly specialized in the translation unit
11143 containing the explicit instantiation.
11145 Of course, we can't instantiate member template classes, since
11146 we don't have any arguments for them. Note that the standard
11147 is unclear on whether the instantiation of the members are
11148 *explicit* instantiations or not. However, the most natural
11149 interpretation is that it should be an explicit instantiation. */
11152 for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp))
11153 if (TREE_CODE (tmp) == FUNCTION_DECL
11154 && DECL_TEMPLATE_INSTANTIATION (tmp))
11155 instantiate_class_member (tmp, extern_p);
11157 for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp))
11158 if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp))
11159 instantiate_class_member (tmp, extern_p);
11161 if (CLASSTYPE_NESTED_UTDS (t))
11162 binding_table_foreach (CLASSTYPE_NESTED_UTDS (t),
11163 bt_instantiate_type_proc, &storage);
11167 /* Given a function DECL, which is a specialization of TMPL, modify
11168 DECL to be a re-instantiation of TMPL with the same template
11169 arguments. TMPL should be the template into which tsubst'ing
11170 should occur for DECL, not the most general template.
11172 One reason for doing this is a scenario like this:
11175 void f(const T&, int i);
11177 void g() { f(3, 7); }
11180 void f(const T& t, const int i) { }
11182 Note that when the template is first instantiated, with
11183 instantiate_template, the resulting DECL will have no name for the
11184 first parameter, and the wrong type for the second. So, when we go
11185 to instantiate the DECL, we regenerate it. */
11188 regenerate_decl_from_template (tree decl, tree tmpl)
11190 /* The arguments used to instantiate DECL, from the most general
11195 args = DECL_TI_ARGS (decl);
11196 code_pattern = DECL_TEMPLATE_RESULT (tmpl);
11198 /* Make sure that we can see identifiers, and compute access
11200 push_access_scope (decl);
11202 if (TREE_CODE (decl) == FUNCTION_DECL)
11210 args_depth = TMPL_ARGS_DEPTH (args);
11211 parms_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl));
11212 if (args_depth > parms_depth)
11213 args = get_innermost_template_args (args, parms_depth);
11215 specs = tsubst_exception_specification (TREE_TYPE (code_pattern),
11216 args, tf_error, NULL_TREE);
11218 TREE_TYPE (decl) = build_exception_variant (TREE_TYPE (decl),
11221 /* Merge parameter declarations. */
11222 decl_parm = skip_artificial_parms_for (decl,
11223 DECL_ARGUMENTS (decl));
11225 = skip_artificial_parms_for (code_pattern,
11226 DECL_ARGUMENTS (code_pattern));
11232 if (DECL_NAME (decl_parm) != DECL_NAME (pattern_parm))
11233 DECL_NAME (decl_parm) = DECL_NAME (pattern_parm);
11234 parm_type = tsubst (TREE_TYPE (pattern_parm), args, tf_error,
11236 parm_type = type_decays_to (parm_type);
11237 if (!same_type_p (TREE_TYPE (decl_parm), parm_type))
11238 TREE_TYPE (decl_parm) = parm_type;
11239 attributes = DECL_ATTRIBUTES (pattern_parm);
11240 if (DECL_ATTRIBUTES (decl_parm) != attributes)
11242 DECL_ATTRIBUTES (decl_parm) = attributes;
11243 cplus_decl_attributes (&decl_parm, attributes, /*flags=*/0);
11245 decl_parm = TREE_CHAIN (decl_parm);
11246 pattern_parm = TREE_CHAIN (pattern_parm);
11249 /* Merge additional specifiers from the CODE_PATTERN. */
11250 if (DECL_DECLARED_INLINE_P (code_pattern)
11251 && !DECL_DECLARED_INLINE_P (decl))
11252 DECL_DECLARED_INLINE_P (decl) = 1;
11253 if (DECL_INLINE (code_pattern) && !DECL_INLINE (decl))
11254 DECL_INLINE (decl) = 1;
11256 else if (TREE_CODE (decl) == VAR_DECL)
11258 if (!DECL_INITIALIZED_IN_CLASS_P (decl)
11259 && DECL_INITIAL (code_pattern))
11260 DECL_INITIAL (decl) =
11261 tsubst_expr (DECL_INITIAL (code_pattern), args,
11262 tf_error, DECL_TI_TEMPLATE (decl));
11265 gcc_unreachable ();
11267 pop_access_scope (decl);
11270 /* Return the TEMPLATE_DECL into which DECL_TI_ARGS(DECL) should be
11271 substituted to get DECL. */
11274 template_for_substitution (tree decl)
11276 tree tmpl = DECL_TI_TEMPLATE (decl);
11278 /* Set TMPL to the template whose DECL_TEMPLATE_RESULT is the pattern
11279 for the instantiation. This is not always the most general
11280 template. Consider, for example:
11283 struct S { template <class U> void f();
11284 template <> void f<int>(); };
11286 and an instantiation of S<double>::f<int>. We want TD to be the
11287 specialization S<T>::f<int>, not the more general S<T>::f<U>. */
11288 while (/* An instantiation cannot have a definition, so we need a
11289 more general template. */
11290 DECL_TEMPLATE_INSTANTIATION (tmpl)
11291 /* We must also deal with friend templates. Given:
11293 template <class T> struct S {
11294 template <class U> friend void f() {};
11297 S<int>::f<U> say, is not an instantiation of S<T>::f<U>,
11298 so far as the language is concerned, but that's still
11299 where we get the pattern for the instantiation from. On
11300 other hand, if the definition comes outside the class, say:
11302 template <class T> struct S {
11303 template <class U> friend void f();
11305 template <class U> friend void f() {}
11307 we don't need to look any further. That's what the check for
11308 DECL_INITIAL is for. */
11309 || (TREE_CODE (decl) == FUNCTION_DECL
11310 && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (tmpl)
11311 && !DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl))))
11313 /* The present template, TD, should not be a definition. If it
11314 were a definition, we should be using it! Note that we
11315 cannot restructure the loop to just keep going until we find
11316 a template with a definition, since that might go too far if
11317 a specialization was declared, but not defined. */
11318 gcc_assert (TREE_CODE (decl) != VAR_DECL
11319 || DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (tmpl)));
11321 /* Fetch the more general template. */
11322 tmpl = DECL_TI_TEMPLATE (tmpl);
11328 /* Produce the definition of D, a _DECL generated from a template. If
11329 DEFER_OK is nonzero, then we don't have to actually do the
11330 instantiation now; we just have to do it sometime. Normally it is
11331 an error if this is an explicit instantiation but D is undefined.
11332 If UNDEFINED_OK is nonzero, then instead we treat it as an implicit
11333 instantiation. UNDEFINED_OK is nonzero only if we are being used
11334 to instantiate the members of an explicitly instantiated class
11339 instantiate_decl (tree d, int defer_ok, int undefined_ok)
11341 tree tmpl = DECL_TI_TEMPLATE (d);
11348 int pattern_defined;
11350 location_t saved_loc = input_location;
11352 /* This function should only be used to instantiate templates for
11353 functions and static member variables. */
11354 gcc_assert (TREE_CODE (d) == FUNCTION_DECL
11355 || TREE_CODE (d) == VAR_DECL);
11357 /* Variables are never deferred; if instantiation is required, they
11358 are instantiated right away. That allows for better code in the
11359 case that an expression refers to the value of the variable --
11360 if the variable has a constant value the referring expression can
11361 take advantage of that fact. */
11362 if (TREE_CODE (d) == VAR_DECL)
11365 /* Don't instantiate cloned functions. Instead, instantiate the
11366 functions they cloned. */
11367 if (TREE_CODE (d) == FUNCTION_DECL && DECL_CLONED_FUNCTION_P (d))
11368 d = DECL_CLONED_FUNCTION (d);
11370 if (DECL_TEMPLATE_INSTANTIATED (d))
11371 /* D has already been instantiated. It might seem reasonable to
11372 check whether or not D is an explicit instantiation, and, if so,
11373 stop here. But when an explicit instantiation is deferred
11374 until the end of the compilation, DECL_EXPLICIT_INSTANTIATION
11375 is set, even though we still need to do the instantiation. */
11378 /* If we already have a specialization of this declaration, then
11379 there's no reason to instantiate it. Note that
11380 retrieve_specialization gives us both instantiations and
11381 specializations, so we must explicitly check
11382 DECL_TEMPLATE_SPECIALIZATION. */
11383 gen_tmpl = most_general_template (tmpl);
11384 gen_args = DECL_TI_ARGS (d);
11385 spec = retrieve_specialization (gen_tmpl, gen_args,
11386 /*class_specializations_p=*/false);
11387 if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec))
11390 /* This needs to happen before any tsubsting. */
11391 if (! push_tinst_level (d))
11394 timevar_push (TV_PARSE);
11396 /* We may be in the middle of deferred access check. Disable it now. */
11397 push_deferring_access_checks (dk_no_deferred);
11399 /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern
11400 for the instantiation. */
11401 td = template_for_substitution (d);
11402 code_pattern = DECL_TEMPLATE_RESULT (td);
11404 if ((DECL_NAMESPACE_SCOPE_P (d) && !DECL_INITIALIZED_IN_CLASS_P (d))
11405 || DECL_TEMPLATE_SPECIALIZATION (td))
11406 /* In the case of a friend template whose definition is provided
11407 outside the class, we may have too many arguments. Drop the
11408 ones we don't need. The same is true for specializations. */
11409 args = get_innermost_template_args
11410 (gen_args, TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (td)));
11414 if (TREE_CODE (d) == FUNCTION_DECL)
11415 pattern_defined = (DECL_SAVED_TREE (code_pattern) != NULL_TREE);
11417 pattern_defined = ! DECL_IN_AGGR_P (code_pattern);
11418 /* Unless an explicit instantiation directive has already determined
11419 the linkage of D, remember that a definition is available for
11421 if (pattern_defined
11422 && !DECL_INTERFACE_KNOWN (d)
11423 && !DECL_NOT_REALLY_EXTERN (d))
11424 mark_definable (d);
11426 input_location = DECL_SOURCE_LOCATION (d);
11428 if (! pattern_defined && DECL_EXPLICIT_INSTANTIATION (d) && undefined_ok)
11430 DECL_NOT_REALLY_EXTERN (d) = 0;
11431 SET_DECL_IMPLICIT_INSTANTIATION (d);
11436 /* Recheck the substitutions to obtain any warning messages
11437 about ignoring cv qualifiers. */
11438 tree gen = DECL_TEMPLATE_RESULT (gen_tmpl);
11439 tree type = TREE_TYPE (gen);
11441 /* Make sure that we can see identifiers, and compute access
11442 correctly. D is already the target FUNCTION_DECL with the
11444 push_access_scope (d);
11446 if (TREE_CODE (gen) == FUNCTION_DECL)
11448 tsubst (DECL_ARGUMENTS (gen), gen_args, tf_error | tf_warning, d);
11449 tsubst (TYPE_RAISES_EXCEPTIONS (type), gen_args,
11450 tf_error | tf_warning, d);
11451 /* Don't simply tsubst the function type, as that will give
11452 duplicate warnings about poor parameter qualifications.
11453 The function arguments are the same as the decl_arguments
11454 without the top level cv qualifiers. */
11455 type = TREE_TYPE (type);
11457 tsubst (type, gen_args, tf_error | tf_warning, d);
11459 pop_access_scope (d);
11462 /* We should have set up DECL_INITIAL in instantiate_class_template
11463 for in-class definitions of static data members. */
11464 gcc_assert (!(TREE_CODE (d) == VAR_DECL
11465 && DECL_INITIALIZED_IN_CLASS_P (d)
11466 && DECL_INITIAL (d) == NULL_TREE));
11468 /* Do not instantiate templates that we know will be defined
11470 if (DECL_INTERFACE_KNOWN (d)
11471 && DECL_REALLY_EXTERN (d)
11472 && ! (TREE_CODE (d) == FUNCTION_DECL
11473 && DECL_INLINE (d)))
11475 /* Defer all other templates, unless we have been explicitly
11476 forbidden from doing so. We restore the source position here
11477 because it's used by add_pending_template. */
11478 else if (! pattern_defined || defer_ok)
11480 input_location = saved_loc;
11482 if (at_eof && !pattern_defined
11483 && DECL_EXPLICIT_INSTANTIATION (d))
11486 The definition of a non-exported function template, a
11487 non-exported member function template, or a non-exported
11488 member function or static data member of a class template
11489 shall be present in every translation unit in which it is
11490 explicitly instantiated. */
11492 ("explicit instantiation of %qD but no definition available", d);
11494 add_pending_template (d);
11497 /* Tell the repository that D is available in this translation unit
11498 -- and see if it is supposed to be instantiated here. */
11499 if (TREE_PUBLIC (d) && !DECL_REALLY_EXTERN (d) && !repo_emit_p (d))
11501 /* In a PCH file, despite the fact that the repository hasn't
11502 requested instantiation in the PCH it is still possible that
11503 an instantiation will be required in a file that includes the
11506 add_pending_template (d);
11507 /* Instantiate inline functions so that the inliner can do its
11508 job, even though we'll not be emitting a copy of this
11510 if (!(TREE_CODE (d) == FUNCTION_DECL
11511 && flag_inline_trees
11512 && DECL_DECLARED_INLINE_P (d)))
11516 need_push = !cfun || !global_bindings_p ();
11518 push_to_top_level ();
11520 /* Mark D as instantiated so that recursive calls to
11521 instantiate_decl do not try to instantiate it again. */
11522 DECL_TEMPLATE_INSTANTIATED (d) = 1;
11524 /* Regenerate the declaration in case the template has been modified
11525 by a subsequent redeclaration. */
11526 regenerate_decl_from_template (d, td);
11528 /* We already set the file and line above. Reset them now in case
11529 they changed as a result of calling regenerate_decl_from_template. */
11530 input_location = DECL_SOURCE_LOCATION (d);
11532 if (TREE_CODE (d) == VAR_DECL)
11534 /* Clear out DECL_RTL; whatever was there before may not be right
11535 since we've reset the type of the declaration. */
11536 SET_DECL_RTL (d, NULL_RTX);
11537 DECL_IN_AGGR_P (d) = 0;
11539 /* Clear DECL_EXTERNAL so that cp_finish_decl will process the
11540 initializer. That function will defer actual emission until
11541 we have a chance to determine linkage. */
11542 DECL_EXTERNAL (d) = 0;
11544 /* Enter the scope of D so that access-checking works correctly. */
11545 push_nested_class (DECL_CONTEXT (d));
11547 (!DECL_INITIALIZED_IN_CLASS_P (d)
11548 ? DECL_INITIAL (d) : NULL_TREE),
11550 pop_nested_class ();
11552 else if (TREE_CODE (d) == FUNCTION_DECL)
11554 htab_t saved_local_specializations;
11559 /* Save away the current list, in case we are instantiating one
11560 template from within the body of another. */
11561 saved_local_specializations = local_specializations;
11563 /* Set up the list of local specializations. */
11564 local_specializations = htab_create (37,
11565 hash_local_specialization,
11566 eq_local_specializations,
11569 /* Set up context. */
11570 start_preparsed_function (d, NULL_TREE, SF_PRE_PARSED);
11572 /* Create substitution entries for the parameters. */
11573 subst_decl = DECL_TEMPLATE_RESULT (template_for_substitution (d));
11574 tmpl_parm = DECL_ARGUMENTS (subst_decl);
11575 spec_parm = DECL_ARGUMENTS (d);
11576 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (d))
11578 register_local_specialization (spec_parm, tmpl_parm);
11579 spec_parm = skip_artificial_parms_for (d, spec_parm);
11580 tmpl_parm = skip_artificial_parms_for (subst_decl, tmpl_parm);
11584 register_local_specialization (spec_parm, tmpl_parm);
11585 tmpl_parm = TREE_CHAIN (tmpl_parm);
11586 spec_parm = TREE_CHAIN (spec_parm);
11588 gcc_assert (!spec_parm);
11590 /* Substitute into the body of the function. */
11591 tsubst_expr (DECL_SAVED_TREE (code_pattern), args,
11592 tf_error | tf_warning, tmpl);
11594 /* We don't need the local specializations any more. */
11595 htab_delete (local_specializations);
11596 local_specializations = saved_local_specializations;
11598 /* Finish the function. */
11599 d = finish_function (0);
11600 expand_or_defer_fn (d);
11603 /* We're not deferring instantiation any more. */
11604 TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d)) = 0;
11607 pop_from_top_level ();
11610 input_location = saved_loc;
11611 pop_deferring_access_checks ();
11612 pop_tinst_level ();
11614 timevar_pop (TV_PARSE);
11619 /* Run through the list of templates that we wish we could
11620 instantiate, and instantiate any we can. RETRIES is the
11621 number of times we retry pending template instantiation. */
11624 instantiate_pending_templates (int retries)
11627 tree last = NULL_TREE;
11629 location_t saved_loc = input_location;
11630 int saved_in_system_header = in_system_header;
11632 /* Instantiating templates may trigger vtable generation. This in turn
11633 may require further template instantiations. We place a limit here
11634 to avoid infinite loop. */
11635 if (pending_templates && retries >= max_tinst_depth)
11637 cp_error_at ("template instantiation depth exceeds maximum of %d"
11638 " (use -ftemplate-depth-NN to increase the maximum)"
11639 " instantiating %q+D, possibly from virtual table"
11641 max_tinst_depth, TREE_VALUE (pending_templates));
11649 t = &pending_templates;
11652 tree instantiation = TREE_VALUE (*t);
11654 reopen_tinst_level (TREE_PURPOSE (*t));
11656 if (TYPE_P (instantiation))
11660 if (!COMPLETE_TYPE_P (instantiation))
11662 instantiate_class_template (instantiation);
11663 if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation))
11664 for (fn = TYPE_METHODS (instantiation);
11666 fn = TREE_CHAIN (fn))
11667 if (! DECL_ARTIFICIAL (fn))
11668 instantiate_decl (fn, /*defer_ok=*/0,
11669 /*undefined_ok=*/0);
11670 if (COMPLETE_TYPE_P (instantiation))
11674 if (COMPLETE_TYPE_P (instantiation))
11675 /* If INSTANTIATION has been instantiated, then we don't
11676 need to consider it again in the future. */
11677 *t = TREE_CHAIN (*t);
11681 t = &TREE_CHAIN (*t);
11686 if (!DECL_TEMPLATE_SPECIALIZATION (instantiation)
11687 && !DECL_TEMPLATE_INSTANTIATED (instantiation))
11689 instantiation = instantiate_decl (instantiation,
11691 /*undefined_ok=*/0);
11692 if (DECL_TEMPLATE_INSTANTIATED (instantiation))
11696 if (DECL_TEMPLATE_SPECIALIZATION (instantiation)
11697 || DECL_TEMPLATE_INSTANTIATED (instantiation))
11698 /* If INSTANTIATION has been instantiated, then we don't
11699 need to consider it again in the future. */
11700 *t = TREE_CHAIN (*t);
11704 t = &TREE_CHAIN (*t);
11708 current_tinst_level = NULL_TREE;
11710 last_pending_template = last;
11712 while (reconsider);
11714 input_location = saved_loc;
11715 in_system_header = saved_in_system_header;
11718 /* Substitute ARGVEC into T, which is a list of initializers for
11719 either base class or a non-static data member. The TREE_PURPOSEs
11720 are DECLs, and the TREE_VALUEs are the initializer values. Used by
11721 instantiate_decl. */
11724 tsubst_initializer_list (tree t, tree argvec)
11726 tree inits = NULL_TREE;
11728 for (; t; t = TREE_CHAIN (t))
11733 decl = tsubst_copy (TREE_PURPOSE (t), argvec, tf_error | tf_warning,
11735 decl = expand_member_init (decl);
11736 if (decl && !DECL_P (decl))
11737 in_base_initializer = 1;
11739 init = tsubst_expr (TREE_VALUE (t), argvec, tf_error | tf_warning,
11741 in_base_initializer = 0;
11745 init = build_tree_list (decl, init);
11746 TREE_CHAIN (init) = inits;
11753 /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */
11756 set_current_access_from_decl (tree decl)
11758 if (TREE_PRIVATE (decl))
11759 current_access_specifier = access_private_node;
11760 else if (TREE_PROTECTED (decl))
11761 current_access_specifier = access_protected_node;
11763 current_access_specifier = access_public_node;
11766 /* Instantiate an enumerated type. TAG is the template type, NEWTAG
11767 is the instantiation (which should have been created with
11768 start_enum) and ARGS are the template arguments to use. */
11771 tsubst_enum (tree tag, tree newtag, tree args)
11775 for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e))
11780 decl = TREE_VALUE (e);
11781 /* Note that in a template enum, the TREE_VALUE is the
11782 CONST_DECL, not the corresponding INTEGER_CST. */
11783 value = tsubst_expr (DECL_INITIAL (decl),
11784 args, tf_error | tf_warning,
11787 /* Give this enumeration constant the correct access. */
11788 set_current_access_from_decl (decl);
11790 /* Actually build the enumerator itself. */
11791 build_enumerator (DECL_NAME (decl), value, newtag);
11794 finish_enum (newtag);
11795 DECL_SOURCE_LOCATION (TYPE_NAME (newtag))
11796 = DECL_SOURCE_LOCATION (TYPE_NAME (tag));
11799 /* DECL is a FUNCTION_DECL that is a template specialization. Return
11800 its type -- but without substituting the innermost set of template
11801 arguments. So, innermost set of template parameters will appear in
11805 get_mostly_instantiated_function_type (tree decl)
11813 tmpl = most_general_template (DECL_TI_TEMPLATE (decl));
11814 targs = DECL_TI_ARGS (decl);
11815 tparms = DECL_TEMPLATE_PARMS (tmpl);
11816 parm_depth = TMPL_PARMS_DEPTH (tparms);
11818 /* There should be as many levels of arguments as there are levels
11820 gcc_assert (parm_depth == TMPL_ARGS_DEPTH (targs));
11822 fn_type = TREE_TYPE (tmpl);
11824 if (parm_depth == 1)
11825 /* No substitution is necessary. */
11829 int i, save_access_control;
11832 /* Replace the innermost level of the TARGS with NULL_TREEs to
11833 let tsubst know not to substitute for those parameters. */
11834 partial_args = make_tree_vec (TREE_VEC_LENGTH (targs));
11835 for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i)
11836 SET_TMPL_ARGS_LEVEL (partial_args, i,
11837 TMPL_ARGS_LEVEL (targs, i));
11838 SET_TMPL_ARGS_LEVEL (partial_args,
11839 TMPL_ARGS_DEPTH (targs),
11840 make_tree_vec (DECL_NTPARMS (tmpl)));
11842 /* Disable access control as this function is used only during
11844 save_access_control = flag_access_control;
11845 flag_access_control = 0;
11847 ++processing_template_decl;
11848 /* Now, do the (partial) substitution to figure out the
11849 appropriate function type. */
11850 fn_type = tsubst (fn_type, partial_args, tf_error, NULL_TREE);
11851 --processing_template_decl;
11853 /* Substitute into the template parameters to obtain the real
11854 innermost set of parameters. This step is important if the
11855 innermost set of template parameters contains value
11856 parameters whose types depend on outer template parameters. */
11857 TREE_VEC_LENGTH (partial_args)--;
11858 tparms = tsubst_template_parms (tparms, partial_args, tf_error);
11860 flag_access_control = save_access_control;
11866 /* Return truthvalue if we're processing a template different from
11867 the last one involved in diagnostics. */
11869 problematic_instantiation_changed (void)
11871 return last_template_error_tick != tinst_level_tick;
11874 /* Remember current template involved in diagnostics. */
11876 record_last_problematic_instantiation (void)
11878 last_template_error_tick = tinst_level_tick;
11882 current_instantiation (void)
11884 return current_tinst_level;
11887 /* [temp.param] Check that template non-type parm TYPE is of an allowable
11888 type. Return zero for ok, nonzero for disallowed. Issue error and
11889 warning messages under control of COMPLAIN. */
11892 invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain)
11894 if (INTEGRAL_TYPE_P (type))
11896 else if (POINTER_TYPE_P (type))
11898 else if (TYPE_PTR_TO_MEMBER_P (type))
11900 else if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11902 else if (TREE_CODE (type) == TYPENAME_TYPE)
11905 if (complain & tf_error)
11906 error ("%q#T is not a valid type for a template constant parameter", type);
11910 /* Returns TRUE if TYPE is dependent, in the sense of [temp.dep.type].
11911 Assumes that TYPE really is a type, and not the ERROR_MARK_NODE.*/
11914 dependent_type_p_r (tree type)
11920 A type is dependent if it is:
11922 -- a template parameter. Template template parameters are types
11923 for us (since TYPE_P holds true for them) so we handle
11925 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
11926 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM)
11928 /* -- a qualified-id with a nested-name-specifier which contains a
11929 class-name that names a dependent type or whose unqualified-id
11930 names a dependent type. */
11931 if (TREE_CODE (type) == TYPENAME_TYPE)
11933 /* -- a cv-qualified type where the cv-unqualified type is
11935 type = TYPE_MAIN_VARIANT (type);
11936 /* -- a compound type constructed from any dependent type. */
11937 if (TYPE_PTR_TO_MEMBER_P (type))
11938 return (dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type))
11939 || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE
11941 else if (TREE_CODE (type) == POINTER_TYPE
11942 || TREE_CODE (type) == REFERENCE_TYPE)
11943 return dependent_type_p (TREE_TYPE (type));
11944 else if (TREE_CODE (type) == FUNCTION_TYPE
11945 || TREE_CODE (type) == METHOD_TYPE)
11949 if (dependent_type_p (TREE_TYPE (type)))
11951 for (arg_type = TYPE_ARG_TYPES (type);
11953 arg_type = TREE_CHAIN (arg_type))
11954 if (dependent_type_p (TREE_VALUE (arg_type)))
11958 /* -- an array type constructed from any dependent type or whose
11959 size is specified by a constant expression that is
11960 value-dependent. */
11961 if (TREE_CODE (type) == ARRAY_TYPE)
11963 if (TYPE_DOMAIN (type)
11964 && ((value_dependent_expression_p
11965 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
11966 || (type_dependent_expression_p
11967 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))))
11969 return dependent_type_p (TREE_TYPE (type));
11972 /* -- a template-id in which either the template name is a template
11974 if (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11976 /* ... or any of the template arguments is a dependent type or
11977 an expression that is type-dependent or value-dependent. */
11978 else if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INFO (type)
11979 && (any_dependent_template_arguments_p
11980 (INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type)))))
11983 /* All TYPEOF_TYPEs are dependent; if the argument of the `typeof'
11984 expression is not type-dependent, then it should already been
11986 if (TREE_CODE (type) == TYPEOF_TYPE)
11989 /* The standard does not specifically mention types that are local
11990 to template functions or local classes, but they should be
11991 considered dependent too. For example:
11993 template <int I> void f() {
11998 The size of `E' cannot be known until the value of `I' has been
11999 determined. Therefore, `E' must be considered dependent. */
12000 scope = TYPE_CONTEXT (type);
12001 if (scope && TYPE_P (scope))
12002 return dependent_type_p (scope);
12003 else if (scope && TREE_CODE (scope) == FUNCTION_DECL)
12004 return type_dependent_expression_p (scope);
12006 /* Other types are non-dependent. */
12010 /* Returns TRUE if TYPE is dependent, in the sense of
12011 [temp.dep.type]. */
12014 dependent_type_p (tree type)
12016 /* If there are no template parameters in scope, then there can't be
12017 any dependent types. */
12018 if (!processing_template_decl)
12021 /* If the type is NULL, we have not computed a type for the entity
12022 in question; in that case, the type is dependent. */
12026 /* Erroneous types can be considered non-dependent. */
12027 if (type == error_mark_node)
12030 /* If we have not already computed the appropriate value for TYPE,
12032 if (!TYPE_DEPENDENT_P_VALID (type))
12034 TYPE_DEPENDENT_P (type) = dependent_type_p_r (type);
12035 TYPE_DEPENDENT_P_VALID (type) = 1;
12038 return TYPE_DEPENDENT_P (type);
12041 /* Returns TRUE if EXPRESSION is dependent, according to CRITERION. */
12044 dependent_scope_ref_p (tree expression, bool criterion (tree))
12049 gcc_assert (TREE_CODE (expression) == SCOPE_REF);
12051 if (!TYPE_P (TREE_OPERAND (expression, 0)))
12054 scope = TREE_OPERAND (expression, 0);
12055 name = TREE_OPERAND (expression, 1);
12059 An id-expression is type-dependent if it contains a
12060 nested-name-specifier that contains a class-name that names a
12062 /* The suggested resolution to Core Issue 2 implies that if the
12063 qualifying type is the current class, then we must peek
12066 && currently_open_class (scope)
12067 && !criterion (name))
12069 if (dependent_type_p (scope))
12075 /* Returns TRUE if the EXPRESSION is value-dependent, in the sense of
12076 [temp.dep.constexpr] */
12079 value_dependent_expression_p (tree expression)
12081 if (!processing_template_decl)
12084 /* A name declared with a dependent type. */
12085 if (DECL_P (expression) && type_dependent_expression_p (expression))
12088 switch (TREE_CODE (expression))
12090 case IDENTIFIER_NODE:
12091 /* A name that has not been looked up -- must be dependent. */
12094 case TEMPLATE_PARM_INDEX:
12095 /* A non-type template parm. */
12099 /* A non-type template parm. */
12100 if (DECL_TEMPLATE_PARM_P (expression))
12105 /* A constant with integral or enumeration type and is initialized
12106 with an expression that is value-dependent. */
12107 if (DECL_INITIAL (expression)
12108 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (expression))
12109 && value_dependent_expression_p (DECL_INITIAL (expression)))
12113 case DYNAMIC_CAST_EXPR:
12114 case STATIC_CAST_EXPR:
12115 case CONST_CAST_EXPR:
12116 case REINTERPRET_CAST_EXPR:
12118 /* These expressions are value-dependent if the type to which
12119 the cast occurs is dependent or the expression being casted
12120 is value-dependent. */
12122 tree type = TREE_TYPE (expression);
12124 if (dependent_type_p (type))
12127 /* A functional cast has a list of operands. */
12128 expression = TREE_OPERAND (expression, 0);
12131 /* If there are no operands, it must be an expression such
12132 as "int()". This should not happen for aggregate types
12133 because it would form non-constant expressions. */
12134 gcc_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type));
12139 if (TREE_CODE (expression) == TREE_LIST)
12141 for (; expression; expression = TREE_CHAIN (expression))
12142 if (value_dependent_expression_p (TREE_VALUE (expression)))
12147 return value_dependent_expression_p (expression);
12152 /* A `sizeof' expression is value-dependent if the operand is
12154 expression = TREE_OPERAND (expression, 0);
12155 if (TYPE_P (expression))
12156 return dependent_type_p (expression);
12157 return type_dependent_expression_p (expression);
12160 return dependent_scope_ref_p (expression, value_dependent_expression_p);
12162 case COMPONENT_REF:
12163 return (value_dependent_expression_p (TREE_OPERAND (expression, 0))
12164 || value_dependent_expression_p (TREE_OPERAND (expression, 1)));
12167 /* A CALL_EXPR is value-dependent if any argument is
12168 value-dependent. Why do we have to handle CALL_EXPRs in this
12169 function at all? First, some function calls, those for which
12170 value_dependent_expression_p is true, man appear in constant
12171 expressions. Second, there appear to be bugs which result in
12172 other CALL_EXPRs reaching this point. */
12174 tree function = TREE_OPERAND (expression, 0);
12175 tree args = TREE_OPERAND (expression, 1);
12177 if (value_dependent_expression_p (function))
12183 if (TREE_CODE (args) == TREE_LIST)
12185 for (; args; args = TREE_CHAIN (args))
12186 if (value_dependent_expression_p (TREE_VALUE (args)))
12191 return value_dependent_expression_p (args);
12195 /* A constant expression is value-dependent if any subexpression is
12196 value-dependent. */
12197 switch (TREE_CODE_CLASS (TREE_CODE (expression)))
12199 case tcc_reference:
12201 return (value_dependent_expression_p
12202 (TREE_OPERAND (expression, 0)));
12204 case tcc_comparison:
12206 return ((value_dependent_expression_p
12207 (TREE_OPERAND (expression, 0)))
12208 || (value_dependent_expression_p
12209 (TREE_OPERAND (expression, 1))));
12211 case tcc_expression:
12214 for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (expression)); ++i)
12215 /* In some cases, some of the operands may be missing.
12216 (For example, in the case of PREDECREMENT_EXPR, the
12217 amount to increment by may be missing.) That doesn't
12218 make the expression dependent. */
12219 if (TREE_OPERAND (expression, i)
12220 && (value_dependent_expression_p
12221 (TREE_OPERAND (expression, i))))
12231 /* The expression is not value-dependent. */
12235 /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of
12236 [temp.dep.expr]. */
12239 type_dependent_expression_p (tree expression)
12241 if (!processing_template_decl)
12244 if (expression == error_mark_node)
12247 /* An unresolved name is always dependent. */
12248 if (TREE_CODE (expression) == IDENTIFIER_NODE)
12251 /* Some expression forms are never type-dependent. */
12252 if (TREE_CODE (expression) == PSEUDO_DTOR_EXPR
12253 || TREE_CODE (expression) == SIZEOF_EXPR
12254 || TREE_CODE (expression) == ALIGNOF_EXPR
12255 || TREE_CODE (expression) == TYPEID_EXPR
12256 || TREE_CODE (expression) == DELETE_EXPR
12257 || TREE_CODE (expression) == VEC_DELETE_EXPR
12258 || TREE_CODE (expression) == THROW_EXPR)
12261 /* The types of these expressions depends only on the type to which
12262 the cast occurs. */
12263 if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR
12264 || TREE_CODE (expression) == STATIC_CAST_EXPR
12265 || TREE_CODE (expression) == CONST_CAST_EXPR
12266 || TREE_CODE (expression) == REINTERPRET_CAST_EXPR
12267 || TREE_CODE (expression) == CAST_EXPR)
12268 return dependent_type_p (TREE_TYPE (expression));
12270 /* The types of these expressions depends only on the type created
12271 by the expression. */
12272 if (TREE_CODE (expression) == NEW_EXPR
12273 || TREE_CODE (expression) == VEC_NEW_EXPR)
12275 /* For NEW_EXPR tree nodes created inside a template, either
12276 the object type itself or a TREE_LIST may appear as the
12278 tree type = TREE_OPERAND (expression, 1);
12279 if (TREE_CODE (type) == TREE_LIST)
12280 /* This is an array type. We need to check array dimensions
12282 return dependent_type_p (TREE_VALUE (TREE_PURPOSE (type)))
12283 || value_dependent_expression_p
12284 (TREE_OPERAND (TREE_VALUE (type), 1));
12286 return dependent_type_p (type);
12289 if (TREE_CODE (expression) == SCOPE_REF
12290 && dependent_scope_ref_p (expression,
12291 type_dependent_expression_p))
12294 if (TREE_CODE (expression) == FUNCTION_DECL
12295 && DECL_LANG_SPECIFIC (expression)
12296 && DECL_TEMPLATE_INFO (expression)
12297 && (any_dependent_template_arguments_p
12298 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression)))))
12301 if (TREE_CODE (expression) == TEMPLATE_DECL
12302 && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression))
12305 if (TREE_TYPE (expression) == unknown_type_node)
12307 if (TREE_CODE (expression) == ADDR_EXPR)
12308 return type_dependent_expression_p (TREE_OPERAND (expression, 0));
12309 if (TREE_CODE (expression) == COMPONENT_REF
12310 || TREE_CODE (expression) == OFFSET_REF)
12312 if (type_dependent_expression_p (TREE_OPERAND (expression, 0)))
12314 expression = TREE_OPERAND (expression, 1);
12315 if (TREE_CODE (expression) == IDENTIFIER_NODE)
12318 /* SCOPE_REF with non-null TREE_TYPE is always non-dependent. */
12319 if (TREE_CODE (expression) == SCOPE_REF)
12322 if (TREE_CODE (expression) == BASELINK)
12323 expression = BASELINK_FUNCTIONS (expression);
12325 if (TREE_CODE (expression) == TEMPLATE_ID_EXPR)
12327 if (any_dependent_template_arguments_p
12328 (TREE_OPERAND (expression, 1)))
12330 expression = TREE_OPERAND (expression, 0);
12332 gcc_assert (TREE_CODE (expression) == OVERLOAD);
12336 if (type_dependent_expression_p (OVL_CURRENT (expression)))
12338 expression = OVL_NEXT (expression);
12343 return (dependent_type_p (TREE_TYPE (expression)));
12346 /* Returns TRUE if ARGS (a TREE_LIST of arguments to a function call)
12347 contains a type-dependent expression. */
12350 any_type_dependent_arguments_p (tree args)
12354 tree arg = TREE_VALUE (args);
12356 if (type_dependent_expression_p (arg))
12358 args = TREE_CHAIN (args);
12363 /* Returns TRUE if the ARG (a template argument) is dependent. */
12366 dependent_template_arg_p (tree arg)
12368 if (!processing_template_decl)
12371 if (TREE_CODE (arg) == TEMPLATE_DECL
12372 || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM)
12373 return dependent_template_p (arg);
12374 else if (TYPE_P (arg))
12375 return dependent_type_p (arg);
12377 return (type_dependent_expression_p (arg)
12378 || value_dependent_expression_p (arg));
12381 /* Returns true if ARGS (a collection of template arguments) contains
12382 any dependent arguments. */
12385 any_dependent_template_arguments_p (tree args)
12393 for (i = 0; i < TMPL_ARGS_DEPTH (args); ++i)
12395 tree level = TMPL_ARGS_LEVEL (args, i + 1);
12396 for (j = 0; j < TREE_VEC_LENGTH (level); ++j)
12397 if (dependent_template_arg_p (TREE_VEC_ELT (level, j)))
12404 /* Returns TRUE if the template TMPL is dependent. */
12407 dependent_template_p (tree tmpl)
12409 if (TREE_CODE (tmpl) == OVERLOAD)
12413 if (dependent_template_p (OVL_FUNCTION (tmpl)))
12415 tmpl = OVL_CHAIN (tmpl);
12420 /* Template template parameters are dependent. */
12421 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl)
12422 || TREE_CODE (tmpl) == TEMPLATE_TEMPLATE_PARM)
12424 /* So are names that have not been looked up. */
12425 if (TREE_CODE (tmpl) == SCOPE_REF
12426 || TREE_CODE (tmpl) == IDENTIFIER_NODE)
12428 /* So are member templates of dependent classes. */
12429 if (TYPE_P (CP_DECL_CONTEXT (tmpl)))
12430 return dependent_type_p (DECL_CONTEXT (tmpl));
12434 /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */
12437 dependent_template_id_p (tree tmpl, tree args)
12439 return (dependent_template_p (tmpl)
12440 || any_dependent_template_arguments_p (args));
12443 /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the
12444 TYPENAME_TYPE corresponds. Returns ERROR_MARK_NODE if no such TYPE
12445 can be found. Note that this function peers inside uninstantiated
12446 templates and therefore should be used only in extremely limited
12447 situations. ONLY_CURRENT_P restricts this peering to the currently
12448 open classes hierarchy (which is required when comparing types). */
12451 resolve_typename_type (tree type, bool only_current_p)
12459 gcc_assert (TREE_CODE (type) == TYPENAME_TYPE);
12461 scope = TYPE_CONTEXT (type);
12462 name = TYPE_IDENTIFIER (type);
12464 /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve
12465 it first before we can figure out what NAME refers to. */
12466 if (TREE_CODE (scope) == TYPENAME_TYPE)
12467 scope = resolve_typename_type (scope, only_current_p);
12468 /* If we don't know what SCOPE refers to, then we cannot resolve the
12470 if (scope == error_mark_node || TREE_CODE (scope) == TYPENAME_TYPE)
12471 return error_mark_node;
12472 /* If the SCOPE is a template type parameter, we have no way of
12473 resolving the name. */
12474 if (TREE_CODE (scope) == TEMPLATE_TYPE_PARM)
12476 /* If the SCOPE is not the current instantiation, there's no reason
12477 to look inside it. */
12478 if (only_current_p && !currently_open_class (scope))
12479 return error_mark_node;
12480 /* If SCOPE is a partial instantiation, it will not have a valid
12481 TYPE_FIELDS list, so use the original template. */
12482 scope = CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope);
12483 /* Enter the SCOPE so that name lookup will be resolved as if we
12484 were in the class definition. In particular, SCOPE will no
12485 longer be considered a dependent type. */
12486 pushed_scope = push_scope (scope);
12487 /* Look up the declaration. */
12488 decl = lookup_member (scope, name, /*protect=*/0, /*want_type=*/true);
12489 /* Obtain the set of qualifiers applied to the TYPE. */
12490 quals = cp_type_quals (type);
12491 /* For a TYPENAME_TYPE like "typename X::template Y<T>", we want to
12492 find a TEMPLATE_DECL. Otherwise, we want to find a TYPE_DECL. */
12494 type = error_mark_node;
12495 else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == IDENTIFIER_NODE
12496 && TREE_CODE (decl) == TYPE_DECL)
12497 type = TREE_TYPE (decl);
12498 else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == TEMPLATE_ID_EXPR
12499 && DECL_CLASS_TEMPLATE_P (decl))
12503 /* Obtain the template and the arguments. */
12504 tmpl = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 0);
12505 args = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 1);
12506 /* Instantiate the template. */
12507 type = lookup_template_class (tmpl, args, NULL_TREE, NULL_TREE,
12508 /*entering_scope=*/0, tf_error | tf_user);
12511 type = error_mark_node;
12512 /* Qualify the resulting type. */
12513 if (type != error_mark_node && quals)
12514 type = cp_build_qualified_type (type, quals);
12515 /* Leave the SCOPE. */
12517 pop_scope (pushed_scope);
12522 /* EXPR is an expression which is not type-dependent. Return a proxy
12523 for EXPR that can be used to compute the types of larger
12524 expressions containing EXPR. */
12527 build_non_dependent_expr (tree expr)
12531 /* Preserve null pointer constants so that the type of things like
12532 "p == 0" where "p" is a pointer can be determined. */
12533 if (null_ptr_cst_p (expr))
12535 /* Preserve OVERLOADs; the functions must be available to resolve
12537 inner_expr = (TREE_CODE (expr) == ADDR_EXPR ?
12538 TREE_OPERAND (expr, 0) : expr);
12539 if (is_overloaded_fn (inner_expr)
12540 || TREE_CODE (inner_expr) == OFFSET_REF)
12542 /* There is no need to return a proxy for a variable. */
12543 if (TREE_CODE (expr) == VAR_DECL)
12545 /* Preserve string constants; conversions from string constants to
12546 "char *" are allowed, even though normally a "const char *"
12547 cannot be used to initialize a "char *". */
12548 if (TREE_CODE (expr) == STRING_CST)
12550 /* Preserve arithmetic constants, as an optimization -- there is no
12551 reason to create a new node. */
12552 if (TREE_CODE (expr) == INTEGER_CST || TREE_CODE (expr) == REAL_CST)
12554 /* Preserve THROW_EXPRs -- all throw-expressions have type "void".
12555 There is at least one place where we want to know that a
12556 particular expression is a throw-expression: when checking a ?:
12557 expression, there are special rules if the second or third
12558 argument is a throw-expression. */
12559 if (TREE_CODE (expr) == THROW_EXPR)
12562 if (TREE_CODE (expr) == COND_EXPR)
12563 return build3 (COND_EXPR,
12565 TREE_OPERAND (expr, 0),
12566 (TREE_OPERAND (expr, 1)
12567 ? build_non_dependent_expr (TREE_OPERAND (expr, 1))
12568 : build_non_dependent_expr (TREE_OPERAND (expr, 0))),
12569 build_non_dependent_expr (TREE_OPERAND (expr, 2)));
12570 if (TREE_CODE (expr) == COMPOUND_EXPR
12571 && !COMPOUND_EXPR_OVERLOADED (expr))
12572 return build2 (COMPOUND_EXPR,
12574 TREE_OPERAND (expr, 0),
12575 build_non_dependent_expr (TREE_OPERAND (expr, 1)));
12577 /* Otherwise, build a NON_DEPENDENT_EXPR.
12579 REFERENCE_TYPEs are not stripped for expressions in templates
12580 because doing so would play havoc with mangling. Consider, for
12583 template <typename T> void f<T& g>() { g(); }
12585 In the body of "f", the expression for "g" will have
12586 REFERENCE_TYPE, even though the standard says that it should
12587 not. The reason is that we must preserve the syntactic form of
12588 the expression so that mangling (say) "f<g>" inside the body of
12589 "f" works out correctly. Therefore, the REFERENCE_TYPE is
12591 return build1 (NON_DEPENDENT_EXPR, non_reference (TREE_TYPE (expr)), expr);
12594 /* ARGS is a TREE_LIST of expressions as arguments to a function call.
12595 Return a new TREE_LIST with the various arguments replaced with
12596 equivalent non-dependent expressions. */
12599 build_non_dependent_args (tree args)
12604 new_args = NULL_TREE;
12605 for (a = args; a; a = TREE_CHAIN (a))
12606 new_args = tree_cons (NULL_TREE,
12607 build_non_dependent_expr (TREE_VALUE (a)),
12609 return nreverse (new_args);
12612 #include "gt-cp-pt.h"