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 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"
37 #include "tree-inline.h"
44 #include "tree-iterator.h"
46 /* The type of functions taking a tree, and some additional data, and
48 typedef int (*tree_fn_t) (tree, void*);
50 /* The PENDING_TEMPLATES is a TREE_LIST of templates whose
51 instantiations have been deferred, either because their definitions
52 were not yet available, or because we were putting off doing the work.
53 The TREE_PURPOSE of each entry is either a DECL (for a function or
54 static data member), or a TYPE (for a class) indicating what we are
55 hoping to instantiate. The TREE_VALUE is not used. */
56 static GTY(()) tree pending_templates;
57 static GTY(()) tree last_pending_template;
59 int processing_template_parmlist;
60 static int template_header_count;
62 static GTY(()) tree saved_trees;
63 static GTY(()) varray_type inline_parm_levels;
64 static size_t inline_parm_levels_used;
66 static GTY(()) tree current_tinst_level;
68 static GTY(()) tree saved_access_scope;
70 /* A map from local variable declarations in the body of the template
71 presently being instantiated to the corresponding instantiated
73 static htab_t local_specializations;
75 #define UNIFY_ALLOW_NONE 0
76 #define UNIFY_ALLOW_MORE_CV_QUAL 1
77 #define UNIFY_ALLOW_LESS_CV_QUAL 2
78 #define UNIFY_ALLOW_DERIVED 4
79 #define UNIFY_ALLOW_INTEGER 8
80 #define UNIFY_ALLOW_OUTER_LEVEL 16
81 #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32
82 #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64
83 #define UNIFY_ALLOW_MAX_CORRECTION 128
85 #define GTB_VIA_VIRTUAL 1 /* The base class we are examining is
86 virtual, or a base class of a virtual
88 #define GTB_IGNORE_TYPE 2 /* We don't need to try to unify the current
89 type with the desired type. */
91 static void push_access_scope (tree);
92 static void pop_access_scope (tree);
93 static int resolve_overloaded_unification (tree, tree, tree, tree,
94 unification_kind_t, int);
95 static int try_one_overload (tree, tree, tree, tree, tree,
96 unification_kind_t, int, bool);
97 static int unify (tree, tree, tree, tree, int);
98 static void add_pending_template (tree);
99 static void reopen_tinst_level (tree);
100 static tree classtype_mangled_name (tree);
101 static char* mangle_class_name_for_template (const char *, tree, tree);
102 static tree tsubst_initializer_list (tree, tree);
103 static tree get_class_bindings (tree, tree, tree);
104 static tree coerce_template_parms (tree, tree, tree, tsubst_flags_t, int);
105 static void tsubst_enum (tree, tree, tree);
106 static tree add_to_template_args (tree, tree);
107 static tree add_outermost_template_args (tree, tree);
108 static bool check_instantiated_args (tree, tree, tsubst_flags_t);
109 static int maybe_adjust_types_for_deduction (unification_kind_t, tree*, tree*);
110 static int type_unification_real (tree, tree, tree, tree,
111 int, unification_kind_t, int, int);
112 static void note_template_header (int);
113 static tree convert_nontype_argument (tree, tree);
114 static tree convert_template_argument (tree, tree, tree,
115 tsubst_flags_t, int, tree);
116 static tree get_bindings_overload (tree, tree, tree);
117 static int for_each_template_parm (tree, tree_fn_t, void*, htab_t);
118 static tree build_template_parm_index (int, int, int, tree, tree);
119 static int inline_needs_template_parms (tree);
120 static void push_inline_template_parms_recursive (tree, int);
121 static tree retrieve_specialization (tree, tree);
122 static tree retrieve_local_specialization (tree);
123 static tree register_specialization (tree, tree, tree);
124 static void register_local_specialization (tree, tree);
125 static tree reduce_template_parm_level (tree, tree, int);
126 static tree build_template_decl (tree, tree);
127 static int mark_template_parm (tree, void *);
128 static int template_parm_this_level_p (tree, void *);
129 static tree tsubst_friend_function (tree, tree);
130 static tree tsubst_friend_class (tree, tree);
131 static int can_complete_type_without_circularity (tree);
132 static tree get_bindings (tree, tree, tree);
133 static tree get_bindings_real (tree, tree, tree, int, int, int);
134 static int template_decl_level (tree);
135 static int check_cv_quals_for_unify (int, tree, tree);
136 static tree tsubst_template_arg (tree, tree, tsubst_flags_t, tree);
137 static tree tsubst_template_args (tree, tree, tsubst_flags_t, tree);
138 static tree tsubst_template_parms (tree, tree, tsubst_flags_t);
139 static void regenerate_decl_from_template (tree, tree);
140 static tree most_specialized (tree, tree, tree);
141 static tree most_specialized_class (tree, tree);
142 static int template_class_depth_real (tree, int);
143 static tree tsubst_aggr_type (tree, tree, tsubst_flags_t, tree, int);
144 static tree tsubst_decl (tree, tree, tree, tsubst_flags_t);
145 static tree tsubst_arg_types (tree, tree, tsubst_flags_t, tree);
146 static tree tsubst_function_type (tree, tree, tsubst_flags_t, tree);
147 static void check_specialization_scope (void);
148 static tree process_partial_specialization (tree);
149 static void set_current_access_from_decl (tree);
150 static void check_default_tmpl_args (tree, tree, int, int);
151 static tree tsubst_call_declarator_parms (tree, tree, tsubst_flags_t, tree);
152 static tree get_template_base_recursive (tree, tree, tree, tree, tree, int);
153 static tree get_template_base (tree, tree, tree, tree);
154 static int verify_class_unification (tree, tree, tree);
155 static tree try_class_unification (tree, tree, tree, tree);
156 static int coerce_template_template_parms (tree, tree, tsubst_flags_t,
158 static tree determine_specialization (tree, tree, tree *, int);
159 static int template_args_equal (tree, tree);
160 static void tsubst_default_arguments (tree);
161 static tree for_each_template_parm_r (tree *, int *, void *);
162 static tree copy_default_args_to_explicit_spec_1 (tree, tree);
163 static void copy_default_args_to_explicit_spec (tree);
164 static int invalid_nontype_parm_type_p (tree, tsubst_flags_t);
165 static int eq_local_specializations (const void *, const void *);
166 static bool dependent_type_p_r (tree);
167 static tree tsubst (tree, tree, tsubst_flags_t, tree);
168 static tree tsubst_expr (tree, tree, tsubst_flags_t, tree);
169 static tree tsubst_copy (tree, tree, tsubst_flags_t, tree);
171 /* Make the current scope suitable for access checking when we are
172 processing T. T can be FUNCTION_DECL for instantiated function
173 template, or VAR_DECL for static member variable (need by
174 instantiate_decl). */
177 push_access_scope (tree t)
179 my_friendly_assert (TREE_CODE (t) == FUNCTION_DECL
180 || TREE_CODE (t) == VAR_DECL,
183 if (DECL_CLASS_SCOPE_P (t))
184 push_nested_class (DECL_CONTEXT (t));
186 push_to_top_level ();
188 if (TREE_CODE (t) == FUNCTION_DECL)
190 saved_access_scope = tree_cons
191 (NULL_TREE, current_function_decl, saved_access_scope);
192 current_function_decl = t;
196 /* Restore the scope set up by push_access_scope. T is the node we
200 pop_access_scope (tree t)
202 if (TREE_CODE (t) == FUNCTION_DECL)
204 current_function_decl = TREE_VALUE (saved_access_scope);
205 saved_access_scope = TREE_CHAIN (saved_access_scope);
208 if (DECL_CLASS_SCOPE_P (t))
211 pop_from_top_level ();
214 /* Do any processing required when DECL (a member template
215 declaration) is finished. Returns the TEMPLATE_DECL corresponding
216 to DECL, unless it is a specialization, in which case the DECL
217 itself is returned. */
220 finish_member_template_decl (tree decl)
222 if (decl == error_mark_node)
223 return error_mark_node;
225 my_friendly_assert (DECL_P (decl), 20020812);
227 if (TREE_CODE (decl) == TYPE_DECL)
231 type = TREE_TYPE (decl);
232 if (IS_AGGR_TYPE (type)
233 && CLASSTYPE_TEMPLATE_INFO (type)
234 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (type))
236 tree tmpl = CLASSTYPE_TI_TEMPLATE (type);
237 check_member_template (tmpl);
242 else if (TREE_CODE (decl) == FIELD_DECL)
243 error ("data member `%D' cannot be a member template", decl);
244 else if (DECL_TEMPLATE_INFO (decl))
246 if (!DECL_TEMPLATE_SPECIALIZATION (decl))
248 check_member_template (DECL_TI_TEMPLATE (decl));
249 return DECL_TI_TEMPLATE (decl);
255 error ("invalid member template declaration `%D'", decl);
257 return error_mark_node;
260 /* Returns the template nesting level of the indicated class TYPE.
270 A<T>::B<U> has depth two, while A<T> has depth one.
271 Both A<T>::B<int> and A<int>::B<U> have depth one, if
272 COUNT_SPECIALIZATIONS is 0 or if they are instantiations, not
275 This function is guaranteed to return 0 if passed NULL_TREE so
276 that, for example, `template_class_depth (current_class_type)' is
280 template_class_depth_real (tree type, int count_specializations)
285 type && TREE_CODE (type) != NAMESPACE_DECL;
286 type = (TREE_CODE (type) == FUNCTION_DECL)
287 ? CP_DECL_CONTEXT (type) : TYPE_CONTEXT (type))
289 if (TREE_CODE (type) != FUNCTION_DECL)
291 if (CLASSTYPE_TEMPLATE_INFO (type)
292 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type))
293 && ((count_specializations
294 && CLASSTYPE_TEMPLATE_SPECIALIZATION (type))
295 || uses_template_parms (CLASSTYPE_TI_ARGS (type))))
300 if (DECL_TEMPLATE_INFO (type)
301 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (type))
302 && ((count_specializations
303 && DECL_TEMPLATE_SPECIALIZATION (type))
304 || uses_template_parms (DECL_TI_ARGS (type))))
312 /* Returns the template nesting level of the indicated class TYPE.
313 Like template_class_depth_real, but instantiations do not count in
317 template_class_depth (tree type)
319 return template_class_depth_real (type, /*count_specializations=*/0);
322 /* Returns 1 if processing DECL as part of do_pending_inlines
323 needs us to push template parms. */
326 inline_needs_template_parms (tree decl)
328 if (! DECL_TEMPLATE_INFO (decl))
331 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (most_general_template (decl)))
332 > (processing_template_decl + DECL_TEMPLATE_SPECIALIZATION (decl)));
335 /* Subroutine of maybe_begin_member_template_processing.
336 Push the template parms in PARMS, starting from LEVELS steps into the
337 chain, and ending at the beginning, since template parms are listed
341 push_inline_template_parms_recursive (tree parmlist, int levels)
343 tree parms = TREE_VALUE (parmlist);
347 push_inline_template_parms_recursive (TREE_CHAIN (parmlist), levels - 1);
349 ++processing_template_decl;
350 current_template_parms
351 = tree_cons (size_int (processing_template_decl),
352 parms, current_template_parms);
353 TEMPLATE_PARMS_FOR_INLINE (current_template_parms) = 1;
355 begin_scope (TREE_VEC_LENGTH (parms) ? sk_template_parms : sk_template_spec,
357 for (i = 0; i < TREE_VEC_LENGTH (parms); ++i)
359 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
360 my_friendly_assert (DECL_P (parm), 0);
362 switch (TREE_CODE (parm))
371 /* Make a CONST_DECL as is done in process_template_parm.
372 It is ugly that we recreate this here; the original
373 version built in process_template_parm is no longer
375 tree decl = build_decl (CONST_DECL, DECL_NAME (parm),
377 DECL_ARTIFICIAL (decl) = 1;
378 TREE_CONSTANT (decl) = 1;
379 TREE_INVARIANT (decl) = 1;
380 TREE_READONLY (decl) = 1;
381 DECL_INITIAL (decl) = DECL_INITIAL (parm);
382 SET_DECL_TEMPLATE_PARM_P (decl);
393 /* Restore the template parameter context for a member template or
394 a friend template defined in a class definition. */
397 maybe_begin_member_template_processing (tree decl)
402 if (inline_needs_template_parms (decl))
404 parms = DECL_TEMPLATE_PARMS (most_general_template (decl));
405 levels = TMPL_PARMS_DEPTH (parms) - processing_template_decl;
407 if (DECL_TEMPLATE_SPECIALIZATION (decl))
410 parms = TREE_CHAIN (parms);
413 push_inline_template_parms_recursive (parms, levels);
416 /* Remember how many levels of template parameters we pushed so that
417 we can pop them later. */
418 if (!inline_parm_levels)
419 VARRAY_INT_INIT (inline_parm_levels, 4, "inline_parm_levels");
420 if (inline_parm_levels_used == inline_parm_levels->num_elements)
421 VARRAY_GROW (inline_parm_levels, 2 * inline_parm_levels_used);
422 VARRAY_INT (inline_parm_levels, inline_parm_levels_used) = levels;
423 ++inline_parm_levels_used;
426 /* Undo the effects of begin_member_template_processing. */
429 maybe_end_member_template_processing (void)
433 if (!inline_parm_levels_used)
436 --inline_parm_levels_used;
438 i < VARRAY_INT (inline_parm_levels, inline_parm_levels_used);
441 --processing_template_decl;
442 current_template_parms = TREE_CHAIN (current_template_parms);
447 /* Returns nonzero iff T is a member template function. We must be
450 template <class T> class C { void f(); }
452 Here, f is a template function, and a member, but not a member
453 template. This function does not concern itself with the origin of
454 T, only its present state. So if we have
456 template <class T> class C { template <class U> void f(U); }
458 then neither C<int>::f<char> nor C<T>::f<double> is considered
459 to be a member template. But, `template <class U> void
460 C<int>::f(U)' is considered a member template. */
463 is_member_template (tree t)
465 if (!DECL_FUNCTION_TEMPLATE_P (t))
466 /* Anything that isn't a function or a template function is
467 certainly not a member template. */
470 /* A local class can't have member templates. */
471 if (decl_function_context (t))
474 return (DECL_FUNCTION_MEMBER_P (DECL_TEMPLATE_RESULT (t))
475 /* If there are more levels of template parameters than
476 there are template classes surrounding the declaration,
477 then we have a member template. */
478 && (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) >
479 template_class_depth (DECL_CONTEXT (t))));
483 /* Returns nonzero iff T is a member template class. See
484 is_member_template for a description of what precisely constitutes
485 a member template. */
488 is_member_template_class (tree t)
490 if (!DECL_CLASS_TEMPLATE_P (t))
491 /* Anything that isn't a class template, is certainly not a member
495 if (!DECL_CLASS_SCOPE_P (t))
496 /* Anything whose context isn't a class type is surely not a
500 /* If there are more levels of template parameters than there are
501 template classes surrounding the declaration, then we have a
503 return (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (t)) >
504 template_class_depth (DECL_CONTEXT (t)));
508 /* Return a new template argument vector which contains all of ARGS,
509 but has as its innermost set of arguments the EXTRA_ARGS. */
512 add_to_template_args (tree args, tree extra_args)
519 extra_depth = TMPL_ARGS_DEPTH (extra_args);
520 new_args = make_tree_vec (TMPL_ARGS_DEPTH (args) + extra_depth);
522 for (i = 1; i <= TMPL_ARGS_DEPTH (args); ++i)
523 SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (args, i));
525 for (j = 1; j <= extra_depth; ++j, ++i)
526 SET_TMPL_ARGS_LEVEL (new_args, i, TMPL_ARGS_LEVEL (extra_args, j));
531 /* Like add_to_template_args, but only the outermost ARGS are added to
532 the EXTRA_ARGS. In particular, all but TMPL_ARGS_DEPTH
533 (EXTRA_ARGS) levels are added. This function is used to combine
534 the template arguments from a partial instantiation with the
535 template arguments used to attain the full instantiation from the
536 partial instantiation. */
539 add_outermost_template_args (tree args, tree extra_args)
543 /* If there are more levels of EXTRA_ARGS than there are ARGS,
544 something very fishy is going on. */
545 my_friendly_assert (TMPL_ARGS_DEPTH (args) >= TMPL_ARGS_DEPTH (extra_args),
548 /* If *all* the new arguments will be the EXTRA_ARGS, just return
550 if (TMPL_ARGS_DEPTH (args) == TMPL_ARGS_DEPTH (extra_args))
553 /* For the moment, we make ARGS look like it contains fewer levels. */
554 TREE_VEC_LENGTH (args) -= TMPL_ARGS_DEPTH (extra_args);
556 new_args = add_to_template_args (args, extra_args);
558 /* Now, we restore ARGS to its full dimensions. */
559 TREE_VEC_LENGTH (args) += TMPL_ARGS_DEPTH (extra_args);
564 /* Return the N levels of innermost template arguments from the ARGS. */
567 get_innermost_template_args (tree args, int n)
573 my_friendly_assert (n >= 0, 20000603);
575 /* If N is 1, just return the innermost set of template arguments. */
577 return TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args));
579 /* If we're not removing anything, just return the arguments we were
581 extra_levels = TMPL_ARGS_DEPTH (args) - n;
582 my_friendly_assert (extra_levels >= 0, 20000603);
583 if (extra_levels == 0)
586 /* Make a new set of arguments, not containing the outer arguments. */
587 new_args = make_tree_vec (n);
588 for (i = 1; i <= n; ++i)
589 SET_TMPL_ARGS_LEVEL (new_args, i,
590 TMPL_ARGS_LEVEL (args, i + extra_levels));
595 /* We've got a template header coming up; push to a new level for storing
599 begin_template_parm_list (void)
601 /* We use a non-tag-transparent scope here, which causes pushtag to
602 put tags in this scope, rather than in the enclosing class or
603 namespace scope. This is the right thing, since we want
604 TEMPLATE_DECLS, and not TYPE_DECLS for template classes. For a
605 global template class, push_template_decl handles putting the
606 TEMPLATE_DECL into top-level scope. For a nested template class,
609 template <class T> struct S1 {
610 template <class T> struct S2 {};
613 pushtag contains special code to call pushdecl_with_scope on the
614 TEMPLATE_DECL for S2. */
615 begin_scope (sk_template_parms, NULL);
616 ++processing_template_decl;
617 ++processing_template_parmlist;
618 note_template_header (0);
621 /* This routine is called when a specialization is declared. If it is
622 invalid to declare a specialization here, an error is reported. */
625 check_specialization_scope (void)
627 tree scope = current_scope ();
631 An explicit specialization shall be declared in the namespace of
632 which the template is a member, or, for member templates, in the
633 namespace of which the enclosing class or enclosing class
634 template is a member. An explicit specialization of a member
635 function, member class or static data member of a class template
636 shall be declared in the namespace of which the class template
638 if (scope && TREE_CODE (scope) != NAMESPACE_DECL)
639 error ("explicit specialization in non-namespace scope `%D'",
644 In an explicit specialization declaration for a member of a class
645 template or a member template that appears in namespace scope,
646 the member template and some of its enclosing class templates may
647 remain unspecialized, except that the declaration shall not
648 explicitly specialize a class member template if its enclosing
649 class templates are not explicitly specialized as well. */
650 if (current_template_parms)
651 error ("enclosing class templates are not explicitly specialized");
654 /* We've just seen template <>. */
657 begin_specialization (void)
659 begin_scope (sk_template_spec, NULL);
660 note_template_header (1);
661 check_specialization_scope ();
664 /* Called at then end of processing a declaration preceded by
668 end_specialization (void)
671 reset_specialization ();
674 /* Any template <>'s that we have seen thus far are not referring to a
675 function specialization. */
678 reset_specialization (void)
680 processing_specialization = 0;
681 template_header_count = 0;
684 /* We've just seen a template header. If SPECIALIZATION is nonzero,
685 it was of the form template <>. */
688 note_template_header (int specialization)
690 processing_specialization = specialization;
691 template_header_count++;
694 /* We're beginning an explicit instantiation. */
697 begin_explicit_instantiation (void)
699 my_friendly_assert (!processing_explicit_instantiation, 20020913);
700 processing_explicit_instantiation = true;
705 end_explicit_instantiation (void)
707 my_friendly_assert(processing_explicit_instantiation, 20020913);
708 processing_explicit_instantiation = false;
711 /* The TYPE is being declared. If it is a template type, that means it
712 is a partial specialization. Do appropriate error-checking. */
715 maybe_process_partial_specialization (tree type)
717 /* TYPE maybe an ERROR_MARK_NODE. */
718 tree context = TYPE_P (type) ? TYPE_CONTEXT (type) : NULL_TREE;
720 if (CLASS_TYPE_P (type) && CLASSTYPE_USE_TEMPLATE (type))
722 /* This is for ordinary explicit specialization and partial
723 specialization of a template class such as:
725 template <> class C<int>;
729 template <class T> class C<T*>;
731 Make sure that `C<int>' and `C<T*>' are implicit instantiations. */
733 if (CLASSTYPE_IMPLICIT_INSTANTIATION (type)
734 && !COMPLETE_TYPE_P (type))
736 tree tpl_ns = decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type));
737 if (is_associated_namespace (current_namespace, tpl_ns))
738 /* Same or super-using namespace. */;
741 pedwarn ("specializing `%#T' in different namespace", type);
742 cp_pedwarn_at (" from definition of `%#D'",
743 CLASSTYPE_TI_TEMPLATE (type));
745 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type);
746 if (processing_template_decl)
747 push_template_decl (TYPE_MAIN_DECL (type));
749 else if (CLASSTYPE_TEMPLATE_INSTANTIATION (type))
750 error ("specialization of `%T' after instantiation", type);
752 else if (CLASS_TYPE_P (type)
753 && !CLASSTYPE_USE_TEMPLATE (type)
754 && CLASSTYPE_TEMPLATE_INFO (type)
755 && context && CLASS_TYPE_P (context)
756 && CLASSTYPE_TEMPLATE_INFO (context))
758 /* This is for an explicit specialization of member class
759 template according to [temp.expl.spec/18]:
761 template <> template <class U> class C<int>::D;
763 The context `C<int>' must be an implicit instantiation.
764 Otherwise this is just a member class template declared
767 template <> class C<int> { template <class U> class D; };
768 template <> template <class U> class C<int>::D;
770 In the first case, `C<int>::D' is a specialization of `C<T>::D'
771 while in the second case, `C<int>::D' is a primary template
772 and `C<T>::D' may not exist. */
774 if (CLASSTYPE_IMPLICIT_INSTANTIATION (context)
775 && !COMPLETE_TYPE_P (type))
779 if (current_namespace
780 != decl_namespace_context (CLASSTYPE_TI_TEMPLATE (type)))
782 pedwarn ("specializing `%#T' in different namespace", type);
783 cp_pedwarn_at (" from definition of `%#D'",
784 CLASSTYPE_TI_TEMPLATE (type));
787 /* Check for invalid specialization after instantiation:
789 template <> template <> class C<int>::D<int>;
790 template <> template <class U> class C<int>::D; */
792 for (t = DECL_TEMPLATE_INSTANTIATIONS
793 (most_general_template (CLASSTYPE_TI_TEMPLATE (type)));
794 t; t = TREE_CHAIN (t))
795 if (TREE_VALUE (t) != type
796 && TYPE_CONTEXT (TREE_VALUE (t)) == context)
797 error ("specialization `%T' after instantiation `%T'",
798 type, TREE_VALUE (t));
800 /* Mark TYPE as a specialization. And as a result, we only
801 have one level of template argument for the innermost
803 SET_CLASSTYPE_TEMPLATE_SPECIALIZATION (type);
804 CLASSTYPE_TI_ARGS (type)
805 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type));
808 else if (processing_specialization)
809 error ("explicit specialization of non-template `%T'", type);
812 /* Retrieve the specialization (in the sense of [temp.spec] - a
813 specialization is either an instantiation or an explicit
814 specialization) of TMPL for the given template ARGS. If there is
815 no such specialization, return NULL_TREE. The ARGS are a vector of
816 arguments, or a vector of vectors of arguments, in the case of
817 templates with more than one level of parameters. */
820 retrieve_specialization (tree tmpl, tree args)
824 my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0);
826 /* There should be as many levels of arguments as there are
827 levels of parameters. */
828 my_friendly_assert (TMPL_ARGS_DEPTH (args)
829 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)),
832 for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
835 if (comp_template_args (TREE_PURPOSE (s), args))
836 return TREE_VALUE (s);
841 /* Like retrieve_specialization, but for local declarations. */
844 retrieve_local_specialization (tree tmpl)
846 tree spec = htab_find_with_hash (local_specializations, tmpl,
847 htab_hash_pointer (tmpl));
848 return spec ? TREE_PURPOSE (spec) : NULL_TREE;
851 /* Returns nonzero iff DECL is a specialization of TMPL. */
854 is_specialization_of (tree decl, tree tmpl)
858 if (TREE_CODE (decl) == FUNCTION_DECL)
862 t = DECL_TEMPLATE_INFO (t) ? DECL_TI_TEMPLATE (t) : NULL_TREE)
868 my_friendly_assert (TREE_CODE (decl) == TYPE_DECL, 0);
870 for (t = TREE_TYPE (decl);
872 t = CLASSTYPE_USE_TEMPLATE (t)
873 ? TREE_TYPE (CLASSTYPE_TI_TEMPLATE (t)) : NULL_TREE)
874 if (same_type_ignoring_top_level_qualifiers_p (t, TREE_TYPE (tmpl)))
881 /* Returns nonzero iff DECL is a specialization of friend declaration
882 FRIEND according to [temp.friend]. */
885 is_specialization_of_friend (tree decl, tree friend)
887 bool need_template = true;
890 my_friendly_assert (TREE_CODE (decl) == FUNCTION_DECL, 0);
892 /* For [temp.friend/6] when FRIEND is an ordinary member function
893 of a template class, we want to check if DECL is a specialization
895 if (TREE_CODE (friend) == FUNCTION_DECL
896 && DECL_TEMPLATE_INFO (friend)
897 && !DECL_USE_TEMPLATE (friend))
899 friend = DECL_TI_TEMPLATE (friend);
900 need_template = false;
903 /* There is nothing to do if this is not a template friend. */
904 if (TREE_CODE (friend) != TEMPLATE_DECL)
907 if (is_specialization_of (decl, friend))
911 A member of a class template may be declared to be a friend of a
912 non-template class. In this case, the corresponding member of
913 every specialization of the class template is a friend of the
914 class granting friendship.
916 For example, given a template friend declaration
918 template <class T> friend void A<T>::f();
920 the member function below is considered a friend
922 template <> struct A<int> {
926 For this type of template friend, TEMPLATE_DEPTH below will be
927 nonzero. To determine if DECL is a friend of FRIEND, we first
928 check if the enclosing class is a specialization of another. */
930 template_depth = template_class_depth (DECL_CONTEXT (friend));
932 && DECL_CLASS_SCOPE_P (decl)
933 && is_specialization_of (TYPE_NAME (DECL_CONTEXT (decl)),
934 CLASSTYPE_TI_TEMPLATE (DECL_CONTEXT (friend))))
936 /* Next, we check the members themselves. In order to handle
937 a few tricky cases like
939 template <class T> friend void A<T>::g(T t);
940 template <class T> template <T t> friend void A<T>::h();
942 we need to figure out what ARGS is (corresponding to `T' in above
943 examples) from DECL for later processing. */
945 tree context = DECL_CONTEXT (decl);
946 tree args = NULL_TREE;
947 int current_depth = 0;
948 while (current_depth < template_depth)
950 if (CLASSTYPE_TEMPLATE_INFO (context))
952 if (current_depth == 0)
953 args = TYPE_TI_ARGS (context);
955 args = add_to_template_args (TYPE_TI_ARGS (context), args);
958 context = TYPE_CONTEXT (context);
961 if (TREE_CODE (decl) == FUNCTION_DECL)
966 tree friend_args_type;
969 /* Make sure that both DECL and FRIEND are templates or
971 is_template = DECL_TEMPLATE_INFO (decl)
972 && PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl));
973 if (need_template ^ is_template)
975 else if (is_template)
977 /* If both are templates, check template parameter list. */
979 = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend),
981 if (!comp_template_parms
982 (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (decl)),
986 decl_type = TREE_TYPE (DECL_TI_TEMPLATE (decl));
989 decl_type = TREE_TYPE (decl);
991 friend_type = tsubst_function_type (TREE_TYPE (friend), args,
993 if (friend_type == error_mark_node)
996 /* Check if return types match. */
997 if (!same_type_p (TREE_TYPE (decl_type), TREE_TYPE (friend_type)))
1000 /* Check if function parameter types match, ignoring the
1001 `this' parameter. */
1002 friend_args_type = TYPE_ARG_TYPES (friend_type);
1003 decl_args_type = TYPE_ARG_TYPES (decl_type);
1004 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (friend))
1005 friend_args_type = TREE_CHAIN (friend_args_type);
1006 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1007 decl_args_type = TREE_CHAIN (decl_args_type);
1008 if (compparms (decl_args_type, friend_args_type))
1015 /* Register the specialization SPEC as a specialization of TMPL with
1016 the indicated ARGS. Returns SPEC, or an equivalent prior
1017 declaration, if available. */
1020 register_specialization (tree spec, tree tmpl, tree args)
1024 my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0);
1026 if (TREE_CODE (spec) == FUNCTION_DECL
1027 && uses_template_parms (DECL_TI_ARGS (spec)))
1028 /* This is the FUNCTION_DECL for a partial instantiation. Don't
1029 register it; we want the corresponding TEMPLATE_DECL instead.
1030 We use `uses_template_parms (DECL_TI_ARGS (spec))' rather than
1031 the more obvious `uses_template_parms (spec)' to avoid problems
1032 with default function arguments. In particular, given
1033 something like this:
1035 template <class T> void f(T t1, T t = T())
1037 the default argument expression is not substituted for in an
1038 instantiation unless and until it is actually needed. */
1041 /* There should be as many levels of arguments as there are
1042 levels of parameters. */
1043 my_friendly_assert (TMPL_ARGS_DEPTH (args)
1044 == TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl)),
1047 for (s = DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
1051 tree fn = TREE_VALUE (s);
1053 /* We can sometimes try to re-register a specialization that we've
1054 already got. In particular, regenerate_decl_from_template
1055 calls duplicate_decls which will update the specialization
1056 list. But, we'll still get called again here anyhow. It's
1057 more convenient to simply allow this than to try to prevent it. */
1060 else if (comp_template_args (TREE_PURPOSE (s), args))
1062 if (DECL_TEMPLATE_SPECIALIZATION (spec))
1064 if (DECL_TEMPLATE_INSTANTIATION (fn))
1067 || DECL_EXPLICIT_INSTANTIATION (fn))
1069 error ("specialization of %D after instantiation",
1075 /* This situation should occur only if the first
1076 specialization is an implicit instantiation,
1077 the second is an explicit specialization, and
1078 the implicit instantiation has not yet been
1079 used. That situation can occur if we have
1080 implicitly instantiated a member function and
1081 then specialized it later.
1083 We can also wind up here if a friend
1084 declaration that looked like an instantiation
1085 turns out to be a specialization:
1087 template <class T> void foo(T);
1088 class S { friend void foo<>(int) };
1089 template <> void foo(int);
1091 We transform the existing DECL in place so that
1092 any pointers to it become pointers to the
1093 updated declaration.
1095 If there was a definition for the template, but
1096 not for the specialization, we want this to
1097 look as if there were no definition, and vice
1099 DECL_INITIAL (fn) = NULL_TREE;
1100 duplicate_decls (spec, fn);
1105 else if (DECL_TEMPLATE_SPECIALIZATION (fn))
1107 if (!duplicate_decls (spec, fn) && DECL_INITIAL (spec))
1108 /* Dup decl failed, but this is a new
1109 definition. Set the line number so any errors
1110 match this new definition. */
1111 DECL_SOURCE_LOCATION (fn) = DECL_SOURCE_LOCATION (spec);
1119 DECL_TEMPLATE_SPECIALIZATIONS (tmpl)
1120 = tree_cons (args, spec, DECL_TEMPLATE_SPECIALIZATIONS (tmpl));
1125 /* Unregister the specialization SPEC as a specialization of TMPL.
1126 Replace it with NEW_SPEC, if NEW_SPEC is non-NULL. Returns true
1127 if the SPEC was listed as a specialization of TMPL. */
1130 reregister_specialization (tree spec, tree tmpl, tree new_spec)
1134 for (s = &DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
1136 s = &TREE_CHAIN (*s))
1137 if (TREE_VALUE (*s) == spec)
1140 *s = TREE_CHAIN (*s);
1142 TREE_VALUE (*s) = new_spec;
1149 /* Compare an entry in the local specializations hash table P1 (which
1150 is really a pointer to a TREE_LIST) with P2 (which is really a
1154 eq_local_specializations (const void *p1, const void *p2)
1156 return TREE_VALUE ((tree) p1) == (tree) p2;
1159 /* Hash P1, an entry in the local specializations table. */
1162 hash_local_specialization (const void* p1)
1164 return htab_hash_pointer (TREE_VALUE ((tree) p1));
1167 /* Like register_specialization, but for local declarations. We are
1168 registering SPEC, an instantiation of TMPL. */
1171 register_local_specialization (tree spec, tree tmpl)
1175 slot = htab_find_slot_with_hash (local_specializations, tmpl,
1176 htab_hash_pointer (tmpl), INSERT);
1177 *slot = build_tree_list (spec, tmpl);
1180 /* Print the list of candidate FNS in an error message. */
1183 print_candidates (tree fns)
1187 const char *str = "candidates are:";
1189 for (fn = fns; fn != NULL_TREE; fn = TREE_CHAIN (fn))
1193 for (f = TREE_VALUE (fn); f; f = OVL_NEXT (f))
1194 cp_error_at ("%s %+#D", str, OVL_CURRENT (f));
1199 /* Returns the template (one of the functions given by TEMPLATE_ID)
1200 which can be specialized to match the indicated DECL with the
1201 explicit template args given in TEMPLATE_ID. The DECL may be
1202 NULL_TREE if none is available. In that case, the functions in
1203 TEMPLATE_ID are non-members.
1205 If NEED_MEMBER_TEMPLATE is nonzero the function is known to be a
1206 specialization of a member template.
1208 The template args (those explicitly specified and those deduced)
1209 are output in a newly created vector *TARGS_OUT.
1211 If it is impossible to determine the result, an error message is
1212 issued. The error_mark_node is returned to indicate failure. */
1215 determine_specialization (tree template_id,
1218 int need_member_template)
1222 tree explicit_targs;
1223 tree candidates = NULL_TREE;
1224 tree templates = NULL_TREE;
1226 *targs_out = NULL_TREE;
1228 if (template_id == error_mark_node)
1229 return error_mark_node;
1231 fns = TREE_OPERAND (template_id, 0);
1232 explicit_targs = TREE_OPERAND (template_id, 1);
1234 if (fns == error_mark_node)
1235 return error_mark_node;
1237 /* Check for baselinks. */
1238 if (BASELINK_P (fns))
1239 fns = BASELINK_FUNCTIONS (fns);
1241 if (!is_overloaded_fn (fns))
1243 error ("`%D' is not a function template", fns);
1244 return error_mark_node;
1247 for (; fns; fns = OVL_NEXT (fns))
1249 tree fn = OVL_CURRENT (fns);
1251 if (TREE_CODE (fn) == TEMPLATE_DECL)
1253 tree decl_arg_types;
1256 /* DECL might be a specialization of FN. */
1258 /* Adjust the type of DECL in case FN is a static member. */
1259 decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
1260 if (DECL_STATIC_FUNCTION_P (fn)
1261 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1262 decl_arg_types = TREE_CHAIN (decl_arg_types);
1264 /* Check that the number of function parameters matches.
1266 template <class T> void f(int i = 0);
1267 template <> void f<int>();
1268 The specialization f<int> is invalid but is not caught
1269 by get_bindings below. */
1271 fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
1272 if (list_length (fn_arg_types) != list_length (decl_arg_types))
1275 /* For a non-static member function, we need to make sure that
1276 the const qualification is the same. This can be done by
1277 checking the 'this' in the argument list. */
1278 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
1279 && !same_type_p (TREE_VALUE (fn_arg_types),
1280 TREE_VALUE (decl_arg_types)))
1283 /* See whether this function might be a specialization of this
1285 targs = get_bindings (fn, decl, explicit_targs);
1288 /* We cannot deduce template arguments that when used to
1289 specialize TMPL will produce DECL. */
1292 /* Save this template, and the arguments deduced. */
1293 templates = tree_cons (targs, fn, templates);
1295 else if (need_member_template)
1296 /* FN is an ordinary member function, and we need a
1297 specialization of a member template. */
1299 else if (TREE_CODE (fn) != FUNCTION_DECL)
1300 /* We can get IDENTIFIER_NODEs here in certain erroneous
1303 else if (!DECL_FUNCTION_MEMBER_P (fn))
1304 /* This is just an ordinary non-member function. Nothing can
1305 be a specialization of that. */
1307 else if (DECL_ARTIFICIAL (fn))
1308 /* Cannot specialize functions that are created implicitly. */
1312 tree decl_arg_types;
1314 /* This is an ordinary member function. However, since
1315 we're here, we can assume it's enclosing class is a
1316 template class. For example,
1318 template <typename T> struct S { void f(); };
1319 template <> void S<int>::f() {}
1321 Here, S<int>::f is a non-template, but S<int> is a
1322 template class. If FN has the same type as DECL, we
1323 might be in business. */
1325 if (!DECL_TEMPLATE_INFO (fn))
1326 /* Its enclosing class is an explicit specialization
1327 of a template class. This is not a candidate. */
1330 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
1331 TREE_TYPE (TREE_TYPE (fn))))
1332 /* The return types differ. */
1335 /* Adjust the type of DECL in case FN is a static member. */
1336 decl_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
1337 if (DECL_STATIC_FUNCTION_P (fn)
1338 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1339 decl_arg_types = TREE_CHAIN (decl_arg_types);
1341 if (compparms (TYPE_ARG_TYPES (TREE_TYPE (fn)),
1344 candidates = tree_cons (NULL_TREE, fn, candidates);
1348 if (templates && TREE_CHAIN (templates))
1354 It is possible for a specialization with a given function
1355 signature to be instantiated from more than one function
1356 template. In such cases, explicit specification of the
1357 template arguments must be used to uniquely identify the
1358 function template specialization being specialized.
1360 Note that here, there's no suggestion that we're supposed to
1361 determine which of the candidate templates is most
1362 specialized. However, we, also have:
1366 Partial ordering of overloaded function template
1367 declarations is used in the following contexts to select
1368 the function template to which a function template
1369 specialization refers:
1371 -- when an explicit specialization refers to a function
1374 So, we do use the partial ordering rules, at least for now.
1375 This extension can only serve to make invalid programs valid,
1376 so it's safe. And, there is strong anecdotal evidence that
1377 the committee intended the partial ordering rules to apply;
1378 the EDG front-end has that behavior, and John Spicer claims
1379 that the committee simply forgot to delete the wording in
1380 [temp.expl.spec]. */
1381 tree tmpl = most_specialized (templates, decl, explicit_targs);
1382 if (tmpl && tmpl != error_mark_node)
1384 targs = get_bindings (tmpl, decl, explicit_targs);
1385 templates = tree_cons (targs, tmpl, NULL_TREE);
1389 if (templates == NULL_TREE && candidates == NULL_TREE)
1391 cp_error_at ("template-id `%D' for `%+D' does not match any template declaration",
1393 return error_mark_node;
1395 else if ((templates && TREE_CHAIN (templates))
1396 || (candidates && TREE_CHAIN (candidates))
1397 || (templates && candidates))
1399 cp_error_at ("ambiguous template specialization `%D' for `%+D'",
1401 chainon (candidates, templates);
1402 print_candidates (candidates);
1403 return error_mark_node;
1406 /* We have one, and exactly one, match. */
1409 /* It was a specialization of an ordinary member function in a
1411 *targs_out = copy_node (DECL_TI_ARGS (TREE_VALUE (candidates)));
1412 return DECL_TI_TEMPLATE (TREE_VALUE (candidates));
1415 /* It was a specialization of a template. */
1416 targs = DECL_TI_ARGS (DECL_TEMPLATE_RESULT (TREE_VALUE (templates)));
1417 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (targs))
1419 *targs_out = copy_node (targs);
1420 SET_TMPL_ARGS_LEVEL (*targs_out,
1421 TMPL_ARGS_DEPTH (*targs_out),
1422 TREE_PURPOSE (templates));
1425 *targs_out = TREE_PURPOSE (templates);
1426 return TREE_VALUE (templates);
1429 /* Returns a chain of parameter types, exactly like the SPEC_TYPES,
1430 but with the default argument values filled in from those in the
1434 copy_default_args_to_explicit_spec_1 (tree spec_types,
1437 tree new_spec_types;
1442 if (spec_types == void_list_node)
1443 return void_list_node;
1445 /* Substitute into the rest of the list. */
1447 copy_default_args_to_explicit_spec_1 (TREE_CHAIN (spec_types),
1448 TREE_CHAIN (tmpl_types));
1450 /* Add the default argument for this parameter. */
1451 return hash_tree_cons (TREE_PURPOSE (tmpl_types),
1452 TREE_VALUE (spec_types),
1456 /* DECL is an explicit specialization. Replicate default arguments
1457 from the template it specializes. (That way, code like:
1459 template <class T> void f(T = 3);
1460 template <> void f(double);
1463 works, as required.) An alternative approach would be to look up
1464 the correct default arguments at the call-site, but this approach
1465 is consistent with how implicit instantiations are handled. */
1468 copy_default_args_to_explicit_spec (tree decl)
1473 tree new_spec_types;
1477 tree object_type = NULL_TREE;
1478 tree in_charge = NULL_TREE;
1479 tree vtt = NULL_TREE;
1481 /* See if there's anything we need to do. */
1482 tmpl = DECL_TI_TEMPLATE (decl);
1483 tmpl_types = TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (tmpl)));
1484 for (t = tmpl_types; t; t = TREE_CHAIN (t))
1485 if (TREE_PURPOSE (t))
1490 old_type = TREE_TYPE (decl);
1491 spec_types = TYPE_ARG_TYPES (old_type);
1493 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1495 /* Remove the this pointer, but remember the object's type for
1497 object_type = TREE_TYPE (TREE_VALUE (spec_types));
1498 spec_types = TREE_CHAIN (spec_types);
1499 tmpl_types = TREE_CHAIN (tmpl_types);
1501 if (DECL_HAS_IN_CHARGE_PARM_P (decl))
1503 /* DECL may contain more parameters than TMPL due to the extra
1504 in-charge parameter in constructors and destructors. */
1505 in_charge = spec_types;
1506 spec_types = TREE_CHAIN (spec_types);
1508 if (DECL_HAS_VTT_PARM_P (decl))
1511 spec_types = TREE_CHAIN (spec_types);
1515 /* Compute the merged default arguments. */
1517 copy_default_args_to_explicit_spec_1 (spec_types, tmpl_types);
1519 /* Compute the new FUNCTION_TYPE. */
1523 new_spec_types = hash_tree_cons (TREE_PURPOSE (vtt),
1528 /* Put the in-charge parameter back. */
1529 new_spec_types = hash_tree_cons (TREE_PURPOSE (in_charge),
1530 TREE_VALUE (in_charge),
1533 new_type = build_method_type_directly (object_type,
1534 TREE_TYPE (old_type),
1538 new_type = build_function_type (TREE_TYPE (old_type),
1540 new_type = cp_build_type_attribute_variant (new_type,
1541 TYPE_ATTRIBUTES (old_type));
1542 new_type = build_exception_variant (new_type,
1543 TYPE_RAISES_EXCEPTIONS (old_type));
1544 TREE_TYPE (decl) = new_type;
1547 /* Check to see if the function just declared, as indicated in
1548 DECLARATOR, and in DECL, is a specialization of a function
1549 template. We may also discover that the declaration is an explicit
1550 instantiation at this point.
1552 Returns DECL, or an equivalent declaration that should be used
1553 instead if all goes well. Issues an error message if something is
1554 amiss. Returns error_mark_node if the error is not easily
1557 FLAGS is a bitmask consisting of the following flags:
1559 2: The function has a definition.
1560 4: The function is a friend.
1562 The TEMPLATE_COUNT is the number of references to qualifying
1563 template classes that appeared in the name of the function. For
1566 template <class T> struct S { void f(); };
1569 the TEMPLATE_COUNT would be 1. However, explicitly specialized
1570 classes are not counted in the TEMPLATE_COUNT, so that in
1572 template <class T> struct S {};
1573 template <> struct S<int> { void f(); }
1574 template <> void S<int>::f();
1576 the TEMPLATE_COUNT would be 0. (Note that this declaration is
1577 invalid; there should be no template <>.)
1579 If the function is a specialization, it is marked as such via
1580 DECL_TEMPLATE_SPECIALIZATION. Furthermore, its DECL_TEMPLATE_INFO
1581 is set up correctly, and it is added to the list of specializations
1582 for that template. */
1585 check_explicit_specialization (tree declarator,
1590 int have_def = flags & 2;
1591 int is_friend = flags & 4;
1592 int specialization = 0;
1593 int explicit_instantiation = 0;
1594 int member_specialization = 0;
1595 tree ctype = DECL_CLASS_CONTEXT (decl);
1596 tree dname = DECL_NAME (decl);
1599 tsk = current_tmpl_spec_kind (template_count);
1604 if (processing_specialization)
1607 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
1609 else if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
1612 /* This could be something like:
1614 template <class T> void f(T);
1615 class S { friend void f<>(int); } */
1619 /* This case handles bogus declarations like template <>
1620 template <class T> void f<int>(); */
1622 error ("template-id `%D' in declaration of primary template",
1629 case tsk_invalid_member_spec:
1630 /* The error has already been reported in
1631 check_specialization_scope. */
1632 return error_mark_node;
1634 case tsk_invalid_expl_inst:
1635 error ("template parameter list used in explicit instantiation");
1641 error ("definition provided for explicit instantiation");
1643 explicit_instantiation = 1;
1646 case tsk_excessive_parms:
1647 error ("too many template parameter lists in declaration of `%D'",
1649 return error_mark_node;
1653 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
1655 member_specialization = 1;
1660 case tsk_insufficient_parms:
1661 if (template_header_count)
1663 error("too few template parameter lists in declaration of `%D'",
1667 else if (ctype != NULL_TREE
1668 && !TYPE_BEING_DEFINED (ctype)
1669 && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype)
1672 /* For backwards compatibility, we accept:
1674 template <class T> struct S { void f(); };
1675 void S<int>::f() {} // Missing template <>
1677 That used to be valid C++. */
1680 ("explicit specialization not preceded by `template <>'");
1682 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
1687 if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
1689 /* This case handles bogus declarations like template <>
1690 template <class T> void f<int>(); */
1692 if (uses_template_parms (declarator))
1693 error ("function template partial specialization `%D' "
1694 "is not allowed", declarator);
1696 error ("template-id `%D' in declaration of primary template",
1701 if (ctype && CLASSTYPE_TEMPLATE_INSTANTIATION (ctype))
1702 /* This is a specialization of a member template, without
1703 specialization the containing class. Something like:
1705 template <class T> struct S {
1706 template <class U> void f (U);
1708 template <> template <class U> void S<int>::f(U) {}
1710 That's a specialization -- but of the entire template. */
1718 if (specialization || member_specialization)
1720 tree t = TYPE_ARG_TYPES (TREE_TYPE (decl));
1721 for (; t; t = TREE_CHAIN (t))
1722 if (TREE_PURPOSE (t))
1725 ("default argument specified in explicit specialization");
1728 if (current_lang_name == lang_name_c)
1729 error ("template specialization with C linkage");
1732 if (specialization || member_specialization || explicit_instantiation)
1734 tree tmpl = NULL_TREE;
1735 tree targs = NULL_TREE;
1737 /* Make sure that the declarator is a TEMPLATE_ID_EXPR. */
1738 if (TREE_CODE (declarator) != TEMPLATE_ID_EXPR)
1742 my_friendly_assert (TREE_CODE (declarator) == IDENTIFIER_NODE, 0);
1747 /* If there is no class context, the explicit instantiation
1748 must be at namespace scope. */
1749 my_friendly_assert (DECL_NAMESPACE_SCOPE_P (decl), 20030625);
1751 /* Find the namespace binding, using the declaration
1753 fns = namespace_binding (dname, CP_DECL_CONTEXT (decl));
1756 declarator = lookup_template_function (fns, NULL_TREE);
1759 if (declarator == error_mark_node)
1760 return error_mark_node;
1762 if (ctype != NULL_TREE && TYPE_BEING_DEFINED (ctype))
1764 if (!explicit_instantiation)
1765 /* A specialization in class scope. This is invalid,
1766 but the error will already have been flagged by
1767 check_specialization_scope. */
1768 return error_mark_node;
1771 /* It's not valid to write an explicit instantiation in
1774 class C { template void f(); }
1776 This case is caught by the parser. However, on
1779 template class C { void f(); };
1781 (which is invalid) we can get here. The error will be
1788 else if (ctype != NULL_TREE
1789 && (TREE_CODE (TREE_OPERAND (declarator, 0)) ==
1792 /* Find the list of functions in ctype that have the same
1793 name as the declared function. */
1794 tree name = TREE_OPERAND (declarator, 0);
1795 tree fns = NULL_TREE;
1798 if (constructor_name_p (name, ctype))
1800 int is_constructor = DECL_CONSTRUCTOR_P (decl);
1802 if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype)
1803 : !TYPE_HAS_DESTRUCTOR (ctype))
1805 /* From [temp.expl.spec]:
1807 If such an explicit specialization for the member
1808 of a class template names an implicitly-declared
1809 special member function (clause _special_), the
1810 program is ill-formed.
1812 Similar language is found in [temp.explicit]. */
1813 error ("specialization of implicitly-declared special member function");
1814 return error_mark_node;
1817 name = is_constructor ? ctor_identifier : dtor_identifier;
1820 if (!DECL_CONV_FN_P (decl))
1822 idx = lookup_fnfields_1 (ctype, name);
1824 fns = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (ctype), idx);
1830 /* For a type-conversion operator, we cannot do a
1831 name-based lookup. We might be looking for `operator
1832 int' which will be a specialization of `operator T'.
1833 So, we find *all* the conversion operators, and then
1834 select from them. */
1837 methods = CLASSTYPE_METHOD_VEC (ctype);
1839 for (idx = CLASSTYPE_FIRST_CONVERSION_SLOT;
1840 idx < TREE_VEC_LENGTH (methods); ++idx)
1842 tree ovl = TREE_VEC_ELT (methods, idx);
1844 if (!ovl || !DECL_CONV_FN_P (OVL_CURRENT (ovl)))
1845 /* There are no more conversion functions. */
1848 /* Glue all these conversion functions together
1849 with those we already have. */
1850 for (; ovl; ovl = OVL_NEXT (ovl))
1851 fns = ovl_cons (OVL_CURRENT (ovl), fns);
1855 if (fns == NULL_TREE)
1857 error ("no member function `%D' declared in `%T'",
1859 return error_mark_node;
1862 TREE_OPERAND (declarator, 0) = fns;
1865 /* Figure out what exactly is being specialized at this point.
1866 Note that for an explicit instantiation, even one for a
1867 member function, we cannot tell apriori whether the
1868 instantiation is for a member template, or just a member
1869 function of a template class. Even if a member template is
1870 being instantiated, the member template arguments may be
1871 elided if they can be deduced from the rest of the
1873 tmpl = determine_specialization (declarator, decl,
1875 member_specialization);
1877 if (!tmpl || tmpl == error_mark_node)
1878 /* We couldn't figure out what this declaration was
1880 return error_mark_node;
1883 tree gen_tmpl = most_general_template (tmpl);
1885 if (explicit_instantiation)
1887 /* We don't set DECL_EXPLICIT_INSTANTIATION here; that
1888 is done by do_decl_instantiation later. */
1890 int arg_depth = TMPL_ARGS_DEPTH (targs);
1891 int parm_depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl));
1893 if (arg_depth > parm_depth)
1895 /* If TMPL is not the most general template (for
1896 example, if TMPL is a friend template that is
1897 injected into namespace scope), then there will
1898 be too many levels of TARGS. Remove some of them
1903 new_targs = make_tree_vec (parm_depth);
1904 for (i = arg_depth - parm_depth; i < arg_depth; ++i)
1905 TREE_VEC_ELT (new_targs, i - (arg_depth - parm_depth))
1906 = TREE_VEC_ELT (targs, i);
1910 return instantiate_template (tmpl, targs, tf_error);
1913 /* If we thought that the DECL was a member function, but it
1914 turns out to be specializing a static member function,
1915 make DECL a static member function as well. */
1916 if (DECL_STATIC_FUNCTION_P (tmpl)
1917 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
1918 revert_static_member_fn (decl);
1920 /* If this is a specialization of a member template of a
1921 template class. In we want to return the TEMPLATE_DECL,
1922 not the specialization of it. */
1923 if (tsk == tsk_template)
1925 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl);
1926 DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl)) = NULL_TREE;
1929 DECL_SOURCE_LOCATION (tmpl) = DECL_SOURCE_LOCATION (decl);
1930 DECL_SOURCE_LOCATION (DECL_TEMPLATE_RESULT (tmpl))
1931 = DECL_SOURCE_LOCATION (decl);
1936 /* Set up the DECL_TEMPLATE_INFO for DECL. */
1937 DECL_TEMPLATE_INFO (decl) = tree_cons (tmpl, targs, NULL_TREE);
1939 /* Inherit default function arguments from the template
1940 DECL is specializing. */
1941 copy_default_args_to_explicit_spec (decl);
1943 /* This specialization has the same protection as the
1944 template it specializes. */
1945 TREE_PRIVATE (decl) = TREE_PRIVATE (gen_tmpl);
1946 TREE_PROTECTED (decl) = TREE_PROTECTED (gen_tmpl);
1948 if (is_friend && !have_def)
1949 /* This is not really a declaration of a specialization.
1950 It's just the name of an instantiation. But, it's not
1951 a request for an instantiation, either. */
1952 SET_DECL_IMPLICIT_INSTANTIATION (decl);
1953 else if (DECL_CONSTRUCTOR_P (decl) || DECL_DESTRUCTOR_P (decl))
1954 /* This is indeed a specialization. In case of constructors
1955 and destructors, we need in-charge and not-in-charge
1956 versions in V3 ABI. */
1957 clone_function_decl (decl, /*update_method_vec_p=*/0);
1959 /* Register this specialization so that we can find it
1961 decl = register_specialization (decl, gen_tmpl, targs);
1968 /* TYPE is being declared. Verify that the use of template headers
1969 and such is reasonable. Issue error messages if not. */
1972 maybe_check_template_type (tree type)
1974 if (template_header_count)
1976 /* We are in the scope of some `template <...>' header. */
1979 = template_class_depth_real (TYPE_CONTEXT (type),
1980 /*count_specializations=*/1);
1982 if (template_header_count <= context_depth)
1983 /* This is OK; the template headers are for the context. We
1984 are actually too lenient here; like
1985 check_explicit_specialization we should consider the number
1986 of template types included in the actual declaration. For
1989 template <class T> struct S {
1990 template <class U> template <class V>
1996 template <class T> struct S {
1997 template <class U> struct I;
2000 template <class T> template <class U.
2005 else if (template_header_count > context_depth + 1)
2006 /* There are two many template parameter lists. */
2007 error ("too many template parameter lists in declaration of `%T'", type);
2011 /* Returns 1 iff PARMS1 and PARMS2 are identical sets of template
2012 parameters. These are represented in the same format used for
2013 DECL_TEMPLATE_PARMS. */
2015 int comp_template_parms (tree parms1, tree parms2)
2020 if (parms1 == parms2)
2023 for (p1 = parms1, p2 = parms2;
2024 p1 != NULL_TREE && p2 != NULL_TREE;
2025 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2))
2027 tree t1 = TREE_VALUE (p1);
2028 tree t2 = TREE_VALUE (p2);
2031 my_friendly_assert (TREE_CODE (t1) == TREE_VEC, 0);
2032 my_friendly_assert (TREE_CODE (t2) == TREE_VEC, 0);
2034 if (TREE_VEC_LENGTH (t1) != TREE_VEC_LENGTH (t2))
2037 for (i = 0; i < TREE_VEC_LENGTH (t2); ++i)
2039 tree parm1 = TREE_VALUE (TREE_VEC_ELT (t1, i));
2040 tree parm2 = TREE_VALUE (TREE_VEC_ELT (t2, i));
2042 if (TREE_CODE (parm1) != TREE_CODE (parm2))
2045 if (TREE_CODE (parm1) == TEMPLATE_TYPE_PARM)
2047 else if (!same_type_p (TREE_TYPE (parm1), TREE_TYPE (parm2)))
2052 if ((p1 != NULL_TREE) != (p2 != NULL_TREE))
2053 /* One set of parameters has more parameters lists than the
2060 /* Complain if DECL shadows a template parameter.
2062 [temp.local]: A template-parameter shall not be redeclared within its
2063 scope (including nested scopes). */
2066 check_template_shadow (tree decl)
2070 /* If we're not in a template, we can't possibly shadow a template
2072 if (!current_template_parms)
2075 /* Figure out what we're shadowing. */
2076 if (TREE_CODE (decl) == OVERLOAD)
2077 decl = OVL_CURRENT (decl);
2078 olddecl = innermost_non_namespace_value (DECL_NAME (decl));
2080 /* If there's no previous binding for this name, we're not shadowing
2081 anything, let alone a template parameter. */
2085 /* If we're not shadowing a template parameter, we're done. Note
2086 that OLDDECL might be an OVERLOAD (or perhaps even an
2087 ERROR_MARK), so we can't just blithely assume it to be a _DECL
2089 if (!DECL_P (olddecl) || !DECL_TEMPLATE_PARM_P (olddecl))
2092 /* We check for decl != olddecl to avoid bogus errors for using a
2093 name inside a class. We check TPFI to avoid duplicate errors for
2094 inline member templates. */
2096 || TEMPLATE_PARMS_FOR_INLINE (current_template_parms))
2099 cp_error_at ("declaration of `%#D'", decl);
2100 cp_error_at (" shadows template parm `%#D'", olddecl);
2103 /* Return a new TEMPLATE_PARM_INDEX with the indicated INDEX, LEVEL,
2104 ORIG_LEVEL, DECL, and TYPE. */
2107 build_template_parm_index (int index,
2113 tree t = make_node (TEMPLATE_PARM_INDEX);
2114 TEMPLATE_PARM_IDX (t) = index;
2115 TEMPLATE_PARM_LEVEL (t) = level;
2116 TEMPLATE_PARM_ORIG_LEVEL (t) = orig_level;
2117 TEMPLATE_PARM_DECL (t) = decl;
2118 TREE_TYPE (t) = type;
2119 TREE_CONSTANT (t) = TREE_CONSTANT (decl);
2120 TREE_INVARIANT (t) = TREE_INVARIANT (decl);
2121 TREE_READONLY (t) = TREE_READONLY (decl);
2126 /* Return a TEMPLATE_PARM_INDEX, similar to INDEX, but whose
2127 TEMPLATE_PARM_LEVEL has been decreased by LEVELS. If such a
2128 TEMPLATE_PARM_INDEX already exists, it is returned; otherwise, a
2129 new one is created. */
2132 reduce_template_parm_level (tree index, tree type, int levels)
2134 if (TEMPLATE_PARM_DESCENDANTS (index) == NULL_TREE
2135 || (TEMPLATE_PARM_LEVEL (TEMPLATE_PARM_DESCENDANTS (index))
2136 != TEMPLATE_PARM_LEVEL (index) - levels))
2138 tree orig_decl = TEMPLATE_PARM_DECL (index);
2141 decl = build_decl (TREE_CODE (orig_decl), DECL_NAME (orig_decl), type);
2142 TREE_CONSTANT (decl) = TREE_CONSTANT (orig_decl);
2143 TREE_INVARIANT (decl) = TREE_INVARIANT (orig_decl);
2144 TREE_READONLY (decl) = TREE_READONLY (orig_decl);
2145 DECL_ARTIFICIAL (decl) = 1;
2146 SET_DECL_TEMPLATE_PARM_P (decl);
2148 t = build_template_parm_index (TEMPLATE_PARM_IDX (index),
2149 TEMPLATE_PARM_LEVEL (index) - levels,
2150 TEMPLATE_PARM_ORIG_LEVEL (index),
2152 TEMPLATE_PARM_DESCENDANTS (index) = t;
2154 /* Template template parameters need this. */
2155 DECL_TEMPLATE_PARMS (decl)
2156 = DECL_TEMPLATE_PARMS (TEMPLATE_PARM_DECL (index));
2159 return TEMPLATE_PARM_DESCENDANTS (index);
2162 /* Process information from new template parameter NEXT and append it to the
2163 LIST being built. This new parameter is a non-type parameter iff
2164 IS_NON_TYPE is true. */
2167 process_template_parm (tree list, tree next, bool is_non_type)
2175 my_friendly_assert (TREE_CODE (parm) == TREE_LIST, 259);
2176 defval = TREE_PURPOSE (parm);
2180 tree p = TREE_VALUE (tree_last (list));
2182 if (TREE_CODE (p) == TYPE_DECL || TREE_CODE (p) == TEMPLATE_DECL)
2183 idx = TEMPLATE_TYPE_IDX (TREE_TYPE (p));
2185 idx = TEMPLATE_PARM_IDX (DECL_INITIAL (p));
2193 parm = TREE_VALUE (parm);
2195 SET_DECL_TEMPLATE_PARM_P (parm);
2199 The top-level cv-qualifiers on the template-parameter are
2200 ignored when determining its type. */
2201 TREE_TYPE (parm) = TYPE_MAIN_VARIANT (TREE_TYPE (parm));
2203 /* A template parameter is not modifiable. */
2204 TREE_CONSTANT (parm) = 1;
2205 TREE_INVARIANT (parm) = 1;
2206 TREE_READONLY (parm) = 1;
2207 if (invalid_nontype_parm_type_p (TREE_TYPE (parm), 1))
2208 TREE_TYPE (parm) = void_type_node;
2209 decl = build_decl (CONST_DECL, DECL_NAME (parm), TREE_TYPE (parm));
2210 TREE_CONSTANT (decl) = 1;
2211 TREE_INVARIANT (decl) = 1;
2212 TREE_READONLY (decl) = 1;
2213 DECL_INITIAL (parm) = DECL_INITIAL (decl)
2214 = build_template_parm_index (idx, processing_template_decl,
2215 processing_template_decl,
2216 decl, TREE_TYPE (parm));
2221 parm = TREE_VALUE (TREE_VALUE (parm));
2223 if (parm && TREE_CODE (parm) == TEMPLATE_DECL)
2225 t = make_aggr_type (TEMPLATE_TEMPLATE_PARM);
2226 /* This is for distinguishing between real templates and template
2227 template parameters */
2228 TREE_TYPE (parm) = t;
2229 TREE_TYPE (DECL_TEMPLATE_RESULT (parm)) = t;
2234 t = make_aggr_type (TEMPLATE_TYPE_PARM);
2235 /* parm is either IDENTIFIER_NODE or NULL_TREE. */
2236 decl = build_decl (TYPE_DECL, parm, t);
2239 TYPE_NAME (t) = decl;
2240 TYPE_STUB_DECL (t) = decl;
2242 TEMPLATE_TYPE_PARM_INDEX (t)
2243 = build_template_parm_index (idx, processing_template_decl,
2244 processing_template_decl,
2245 decl, TREE_TYPE (parm));
2247 DECL_ARTIFICIAL (decl) = 1;
2248 SET_DECL_TEMPLATE_PARM_P (decl);
2250 parm = build_tree_list (defval, parm);
2251 return chainon (list, parm);
2254 /* The end of a template parameter list has been reached. Process the
2255 tree list into a parameter vector, converting each parameter into a more
2256 useful form. Type parameters are saved as IDENTIFIER_NODEs, and others
2260 end_template_parm_list (tree parms)
2264 tree saved_parmlist = make_tree_vec (list_length (parms));
2266 current_template_parms
2267 = tree_cons (size_int (processing_template_decl),
2268 saved_parmlist, current_template_parms);
2270 for (parm = parms, nparms = 0; parm; parm = next, nparms++)
2272 next = TREE_CHAIN (parm);
2273 TREE_VEC_ELT (saved_parmlist, nparms) = parm;
2274 TREE_CHAIN (parm) = NULL_TREE;
2277 --processing_template_parmlist;
2279 return saved_parmlist;
2282 /* end_template_decl is called after a template declaration is seen. */
2285 end_template_decl (void)
2287 reset_specialization ();
2289 if (! processing_template_decl)
2292 /* This matches the pushlevel in begin_template_parm_list. */
2295 --processing_template_decl;
2296 current_template_parms = TREE_CHAIN (current_template_parms);
2299 /* Given a template argument vector containing the template PARMS.
2300 The innermost PARMS are given first. */
2303 current_template_args (void)
2306 tree args = NULL_TREE;
2307 int length = TMPL_PARMS_DEPTH (current_template_parms);
2310 /* If there is only one level of template parameters, we do not
2311 create a TREE_VEC of TREE_VECs. Instead, we return a single
2312 TREE_VEC containing the arguments. */
2314 args = make_tree_vec (length);
2316 for (header = current_template_parms; header; header = TREE_CHAIN (header))
2318 tree a = copy_node (TREE_VALUE (header));
2321 TREE_TYPE (a) = NULL_TREE;
2322 for (i = TREE_VEC_LENGTH (a) - 1; i >= 0; --i)
2324 tree t = TREE_VEC_ELT (a, i);
2326 /* T will be a list if we are called from within a
2327 begin/end_template_parm_list pair, but a vector directly
2328 if within a begin/end_member_template_processing pair. */
2329 if (TREE_CODE (t) == TREE_LIST)
2333 if (TREE_CODE (t) == TYPE_DECL
2334 || TREE_CODE (t) == TEMPLATE_DECL)
2337 t = DECL_INITIAL (t);
2338 TREE_VEC_ELT (a, i) = t;
2343 TREE_VEC_ELT (args, --l) = a;
2351 /* Return a TEMPLATE_DECL corresponding to DECL, using the indicated
2352 template PARMS. Used by push_template_decl below. */
2355 build_template_decl (tree decl, tree parms)
2357 tree tmpl = build_lang_decl (TEMPLATE_DECL, DECL_NAME (decl), NULL_TREE);
2358 DECL_TEMPLATE_PARMS (tmpl) = parms;
2359 DECL_CONTEXT (tmpl) = DECL_CONTEXT (decl);
2360 if (DECL_LANG_SPECIFIC (decl))
2362 DECL_STATIC_FUNCTION_P (tmpl) = DECL_STATIC_FUNCTION_P (decl);
2363 DECL_CONSTRUCTOR_P (tmpl) = DECL_CONSTRUCTOR_P (decl);
2364 DECL_DESTRUCTOR_P (tmpl) = DECL_DESTRUCTOR_P (decl);
2365 DECL_NONCONVERTING_P (tmpl) = DECL_NONCONVERTING_P (decl);
2366 DECL_ASSIGNMENT_OPERATOR_P (tmpl) = DECL_ASSIGNMENT_OPERATOR_P (decl);
2367 if (DECL_OVERLOADED_OPERATOR_P (decl))
2368 SET_OVERLOADED_OPERATOR_CODE (tmpl,
2369 DECL_OVERLOADED_OPERATOR_P (decl));
2375 struct template_parm_data
2377 /* The level of the template parameters we are currently
2381 /* The index of the specialization argument we are currently
2385 /* An array whose size is the number of template parameters. The
2386 elements are nonzero if the parameter has been used in any one
2387 of the arguments processed so far. */
2390 /* An array whose size is the number of template arguments. The
2391 elements are nonzero if the argument makes use of template
2392 parameters of this level. */
2393 int* arg_uses_template_parms;
2396 /* Subroutine of push_template_decl used to see if each template
2397 parameter in a partial specialization is used in the explicit
2398 argument list. If T is of the LEVEL given in DATA (which is
2399 treated as a template_parm_data*), then DATA->PARMS is marked
2403 mark_template_parm (tree t, void* data)
2407 struct template_parm_data* tpd = (struct template_parm_data*) data;
2409 if (TREE_CODE (t) == TEMPLATE_PARM_INDEX)
2411 level = TEMPLATE_PARM_LEVEL (t);
2412 idx = TEMPLATE_PARM_IDX (t);
2416 level = TEMPLATE_TYPE_LEVEL (t);
2417 idx = TEMPLATE_TYPE_IDX (t);
2420 if (level == tpd->level)
2422 tpd->parms[idx] = 1;
2423 tpd->arg_uses_template_parms[tpd->current_arg] = 1;
2426 /* Return zero so that for_each_template_parm will continue the
2427 traversal of the tree; we want to mark *every* template parm. */
2431 /* Process the partial specialization DECL. */
2434 process_partial_specialization (tree decl)
2436 tree type = TREE_TYPE (decl);
2437 tree maintmpl = CLASSTYPE_TI_TEMPLATE (type);
2438 tree specargs = CLASSTYPE_TI_ARGS (type);
2439 tree inner_args = INNERMOST_TEMPLATE_ARGS (specargs);
2440 tree inner_parms = INNERMOST_TEMPLATE_PARMS (current_template_parms);
2441 tree main_inner_parms = DECL_INNERMOST_TEMPLATE_PARMS (maintmpl);
2442 int nargs = TREE_VEC_LENGTH (inner_args);
2443 int ntparms = TREE_VEC_LENGTH (inner_parms);
2445 int did_error_intro = 0;
2446 struct template_parm_data tpd;
2447 struct template_parm_data tpd2;
2449 /* We check that each of the template parameters given in the
2450 partial specialization is used in the argument list to the
2451 specialization. For example:
2453 template <class T> struct S;
2454 template <class T> struct S<T*>;
2456 The second declaration is OK because `T*' uses the template
2457 parameter T, whereas
2459 template <class T> struct S<int>;
2461 is no good. Even trickier is:
2472 The S2<T> declaration is actually invalid; it is a
2473 full-specialization. Of course,
2476 struct S2<T (*)(U)>;
2478 or some such would have been OK. */
2479 tpd.level = TMPL_PARMS_DEPTH (current_template_parms);
2480 tpd.parms = alloca (sizeof (int) * ntparms);
2481 memset (tpd.parms, 0, sizeof (int) * ntparms);
2483 tpd.arg_uses_template_parms = alloca (sizeof (int) * nargs);
2484 memset (tpd.arg_uses_template_parms, 0, sizeof (int) * nargs);
2485 for (i = 0; i < nargs; ++i)
2487 tpd.current_arg = i;
2488 for_each_template_parm (TREE_VEC_ELT (inner_args, i),
2489 &mark_template_parm,
2493 for (i = 0; i < ntparms; ++i)
2494 if (tpd.parms[i] == 0)
2496 /* One of the template parms was not used in the
2498 if (!did_error_intro)
2500 error ("template parameters not used in partial specialization:");
2501 did_error_intro = 1;
2505 TREE_VALUE (TREE_VEC_ELT (inner_parms, i)));
2508 /* [temp.class.spec]
2510 The argument list of the specialization shall not be identical to
2511 the implicit argument list of the primary template. */
2512 if (comp_template_args
2514 INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE
2516 error ("partial specialization `%T' does not specialize any template arguments", type);
2518 /* [temp.class.spec]
2520 A partially specialized non-type argument expression shall not
2521 involve template parameters of the partial specialization except
2522 when the argument expression is a simple identifier.
2524 The type of a template parameter corresponding to a specialized
2525 non-type argument shall not be dependent on a parameter of the
2527 my_friendly_assert (nargs == DECL_NTPARMS (maintmpl), 0);
2529 for (i = 0; i < nargs; ++i)
2531 tree arg = TREE_VEC_ELT (inner_args, i);
2532 if (/* These first two lines are the `non-type' bit. */
2534 && TREE_CODE (arg) != TEMPLATE_DECL
2535 /* This next line is the `argument expression is not just a
2536 simple identifier' condition and also the `specialized
2537 non-type argument' bit. */
2538 && TREE_CODE (arg) != TEMPLATE_PARM_INDEX)
2540 if (tpd.arg_uses_template_parms[i])
2541 error ("template argument `%E' involves template parameter(s)", arg);
2544 /* Look at the corresponding template parameter,
2545 marking which template parameters its type depends
2548 TREE_TYPE (TREE_VALUE (TREE_VEC_ELT (main_inner_parms,
2553 /* We haven't yet initialized TPD2. Do so now. */
2554 tpd2.arg_uses_template_parms
2555 = alloca (sizeof (int) * nargs);
2556 /* The number of parameters here is the number in the
2557 main template, which, as checked in the assertion
2559 tpd2.parms = alloca (sizeof (int) * nargs);
2561 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (maintmpl));
2564 /* Mark the template parameters. But this time, we're
2565 looking for the template parameters of the main
2566 template, not in the specialization. */
2567 tpd2.current_arg = i;
2568 tpd2.arg_uses_template_parms[i] = 0;
2569 memset (tpd2.parms, 0, sizeof (int) * nargs);
2570 for_each_template_parm (type,
2571 &mark_template_parm,
2575 if (tpd2.arg_uses_template_parms [i])
2577 /* The type depended on some template parameters.
2578 If they are fully specialized in the
2579 specialization, that's OK. */
2581 for (j = 0; j < nargs; ++j)
2582 if (tpd2.parms[j] != 0
2583 && tpd.arg_uses_template_parms [j])
2585 error ("type `%T' of template argument `%E' depends on template parameter(s)",
2595 if (retrieve_specialization (maintmpl, specargs))
2596 /* We've already got this specialization. */
2599 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)
2600 = tree_cons (inner_args, inner_parms,
2601 DECL_TEMPLATE_SPECIALIZATIONS (maintmpl));
2602 TREE_TYPE (DECL_TEMPLATE_SPECIALIZATIONS (maintmpl)) = type;
2606 /* Check that a template declaration's use of default arguments is not
2607 invalid. Here, PARMS are the template parameters. IS_PRIMARY is
2608 nonzero if DECL is the thing declared by a primary template.
2609 IS_PARTIAL is nonzero if DECL is a partial specialization. */
2612 check_default_tmpl_args (tree decl, tree parms, int is_primary, int is_partial)
2615 int last_level_to_check;
2620 A default template-argument shall not be specified in a
2621 function template declaration or a function template definition, nor
2622 in the template-parameter-list of the definition of a member of a
2625 if (TREE_CODE (CP_DECL_CONTEXT (decl)) == FUNCTION_DECL)
2626 /* You can't have a function template declaration in a local
2627 scope, nor you can you define a member of a class template in a
2631 if (current_class_type
2632 && !TYPE_BEING_DEFINED (current_class_type)
2633 && DECL_LANG_SPECIFIC (decl)
2634 /* If this is either a friend defined in the scope of the class
2635 or a member function. */
2636 && (DECL_FUNCTION_MEMBER_P (decl)
2637 ? same_type_p (DECL_CONTEXT (decl), current_class_type)
2638 : DECL_FRIEND_CONTEXT (decl)
2639 ? same_type_p (DECL_FRIEND_CONTEXT (decl), current_class_type)
2641 /* And, if it was a member function, it really was defined in
2642 the scope of the class. */
2643 && (!DECL_FUNCTION_MEMBER_P (decl)
2644 || DECL_INITIALIZED_IN_CLASS_P (decl)))
2645 /* We already checked these parameters when the template was
2646 declared, so there's no need to do it again now. This function
2647 was defined in class scope, but we're processing it's body now
2648 that the class is complete. */
2653 If a template-parameter has a default template-argument, all
2654 subsequent template-parameters shall have a default
2655 template-argument supplied. */
2656 for (parm_level = parms; parm_level; parm_level = TREE_CHAIN (parm_level))
2658 tree inner_parms = TREE_VALUE (parm_level);
2659 int ntparms = TREE_VEC_LENGTH (inner_parms);
2660 int seen_def_arg_p = 0;
2663 for (i = 0; i < ntparms; ++i)
2665 tree parm = TREE_VEC_ELT (inner_parms, i);
2666 if (TREE_PURPOSE (parm))
2668 else if (seen_def_arg_p)
2670 error ("no default argument for `%D'", TREE_VALUE (parm));
2671 /* For better subsequent error-recovery, we indicate that
2672 there should have been a default argument. */
2673 TREE_PURPOSE (parm) = error_mark_node;
2678 if (TREE_CODE (decl) != TYPE_DECL || is_partial || !is_primary)
2679 /* For an ordinary class template, default template arguments are
2680 allowed at the innermost level, e.g.:
2681 template <class T = int>
2683 but, in a partial specialization, they're not allowed even
2684 there, as we have in [temp.class.spec]:
2686 The template parameter list of a specialization shall not
2687 contain default template argument values.
2689 So, for a partial specialization, or for a function template,
2690 we look at all of them. */
2693 /* But, for a primary class template that is not a partial
2694 specialization we look at all template parameters except the
2696 parms = TREE_CHAIN (parms);
2698 /* Figure out what error message to issue. */
2699 if (TREE_CODE (decl) == FUNCTION_DECL)
2700 msg = "default template arguments may not be used in function templates";
2701 else if (is_partial)
2702 msg = "default template arguments may not be used in partial specializations";
2704 msg = "default argument for template parameter for class enclosing `%D'";
2706 if (current_class_type && TYPE_BEING_DEFINED (current_class_type))
2707 /* If we're inside a class definition, there's no need to
2708 examine the parameters to the class itself. On the one
2709 hand, they will be checked when the class is defined, and,
2710 on the other, default arguments are valid in things like:
2711 template <class T = double>
2712 struct S { template <class U> void f(U); };
2713 Here the default argument for `S' has no bearing on the
2714 declaration of `f'. */
2715 last_level_to_check = template_class_depth (current_class_type) + 1;
2717 /* Check everything. */
2718 last_level_to_check = 0;
2720 for (parm_level = parms;
2721 parm_level && TMPL_PARMS_DEPTH (parm_level) >= last_level_to_check;
2722 parm_level = TREE_CHAIN (parm_level))
2724 tree inner_parms = TREE_VALUE (parm_level);
2728 ntparms = TREE_VEC_LENGTH (inner_parms);
2729 for (i = 0; i < ntparms; ++i)
2730 if (TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)))
2738 /* Clear out the default argument so that we are not
2740 TREE_PURPOSE (TREE_VEC_ELT (inner_parms, i)) = NULL_TREE;
2743 /* At this point, if we're still interested in issuing messages,
2744 they must apply to classes surrounding the object declared. */
2746 msg = "default argument for template parameter for class enclosing `%D'";
2750 /* Worker for push_template_decl_real, called via
2751 for_each_template_parm. DATA is really an int, indicating the
2752 level of the parameters we are interested in. If T is a template
2753 parameter of that level, return nonzero. */
2756 template_parm_this_level_p (tree t, void* data)
2758 int this_level = *(int *)data;
2761 if (TREE_CODE (t) == TEMPLATE_PARM_INDEX)
2762 level = TEMPLATE_PARM_LEVEL (t);
2764 level = TEMPLATE_TYPE_LEVEL (t);
2765 return level == this_level;
2768 /* Creates a TEMPLATE_DECL for the indicated DECL using the template
2769 parameters given by current_template_args, or reuses a
2770 previously existing one, if appropriate. Returns the DECL, or an
2771 equivalent one, if it is replaced via a call to duplicate_decls.
2773 If IS_FRIEND is nonzero, DECL is a friend declaration. */
2776 push_template_decl_real (tree decl, int is_friend)
2784 int new_template_p = 0;
2786 if (decl == error_mark_node)
2789 /* See if this is a partial specialization. */
2790 is_partial = (DECL_IMPLICIT_TYPEDEF_P (decl)
2791 && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE
2792 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl)));
2794 is_friend |= (TREE_CODE (decl) == FUNCTION_DECL && DECL_FRIEND_P (decl));
2797 /* For a friend, we want the context of the friend function, not
2798 the type of which it is a friend. */
2799 ctx = DECL_CONTEXT (decl);
2800 else if (CP_DECL_CONTEXT (decl)
2801 && TREE_CODE (CP_DECL_CONTEXT (decl)) != NAMESPACE_DECL)
2802 /* In the case of a virtual function, we want the class in which
2804 ctx = CP_DECL_CONTEXT (decl);
2806 /* Otherwise, if we're currently defining some class, the DECL
2807 is assumed to be a member of the class. */
2808 ctx = current_scope ();
2810 if (ctx && TREE_CODE (ctx) == NAMESPACE_DECL)
2813 if (!DECL_CONTEXT (decl))
2814 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
2816 /* See if this is a primary template. */
2817 primary = template_parm_scope_p ();
2821 if (current_lang_name == lang_name_c)
2822 error ("template with C linkage");
2823 else if (TREE_CODE (decl) == TYPE_DECL
2824 && ANON_AGGRNAME_P (DECL_NAME (decl)))
2825 error ("template class without a name");
2826 else if (TREE_CODE (decl) == FUNCTION_DECL
2827 && DECL_DESTRUCTOR_P (decl))
2831 A destructor shall not be a member template. */
2832 error ("destructor `%D' declared as member template", decl);
2833 return error_mark_node;
2835 else if ((DECL_IMPLICIT_TYPEDEF_P (decl)
2836 && CLASS_TYPE_P (TREE_TYPE (decl)))
2837 || (TREE_CODE (decl) == VAR_DECL && ctx && CLASS_TYPE_P (ctx))
2838 || TREE_CODE (decl) == FUNCTION_DECL)
2842 error ("template declaration of `%#D'", decl);
2843 return error_mark_node;
2847 /* Check to see that the rules regarding the use of default
2848 arguments are not being violated. */
2849 check_default_tmpl_args (decl, current_template_parms,
2850 primary, is_partial);
2853 return process_partial_specialization (decl);
2855 args = current_template_args ();
2858 || TREE_CODE (ctx) == FUNCTION_DECL
2859 || (CLASS_TYPE_P (ctx) && TYPE_BEING_DEFINED (ctx))
2860 || (is_friend && !DECL_TEMPLATE_INFO (decl)))
2862 if (DECL_LANG_SPECIFIC (decl)
2863 && DECL_TEMPLATE_INFO (decl)
2864 && DECL_TI_TEMPLATE (decl))
2865 tmpl = DECL_TI_TEMPLATE (decl);
2866 /* If DECL is a TYPE_DECL for a class-template, then there won't
2867 be DECL_LANG_SPECIFIC. The information equivalent to
2868 DECL_TEMPLATE_INFO is found in TYPE_TEMPLATE_INFO instead. */
2869 else if (DECL_IMPLICIT_TYPEDEF_P (decl)
2870 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2871 && TYPE_TI_TEMPLATE (TREE_TYPE (decl)))
2873 /* Since a template declaration already existed for this
2874 class-type, we must be redeclaring it here. Make sure
2875 that the redeclaration is valid. */
2876 redeclare_class_template (TREE_TYPE (decl),
2877 current_template_parms);
2878 /* We don't need to create a new TEMPLATE_DECL; just use the
2879 one we already had. */
2880 tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl));
2884 tmpl = build_template_decl (decl, current_template_parms);
2887 if (DECL_LANG_SPECIFIC (decl)
2888 && DECL_TEMPLATE_SPECIALIZATION (decl))
2890 /* A specialization of a member template of a template
2892 SET_DECL_TEMPLATE_SPECIALIZATION (tmpl);
2893 DECL_TEMPLATE_INFO (tmpl) = DECL_TEMPLATE_INFO (decl);
2894 DECL_TEMPLATE_INFO (decl) = NULL_TREE;
2900 tree a, t, current, parms;
2903 if (TREE_CODE (decl) == TYPE_DECL)
2905 if ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (decl)))
2906 || TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE)
2907 && TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
2908 && TYPE_TI_TEMPLATE (TREE_TYPE (decl)))
2909 tmpl = TYPE_TI_TEMPLATE (TREE_TYPE (decl));
2912 error ("`%D' does not declare a template type", decl);
2916 else if (!DECL_LANG_SPECIFIC (decl) || !DECL_TEMPLATE_INFO (decl))
2918 error ("template definition of non-template `%#D'", decl);
2922 tmpl = DECL_TI_TEMPLATE (decl);
2924 if (DECL_FUNCTION_TEMPLATE_P (tmpl)
2925 && DECL_TEMPLATE_INFO (decl) && DECL_TI_ARGS (decl)
2926 && DECL_TEMPLATE_SPECIALIZATION (decl)
2927 && is_member_template (tmpl))
2931 /* The declaration is a specialization of a member
2932 template, declared outside the class. Therefore, the
2933 innermost template arguments will be NULL, so we
2934 replace them with the arguments determined by the
2935 earlier call to check_explicit_specialization. */
2936 args = DECL_TI_ARGS (decl);
2939 = build_template_decl (decl, current_template_parms);
2940 DECL_TEMPLATE_RESULT (new_tmpl) = decl;
2941 TREE_TYPE (new_tmpl) = TREE_TYPE (decl);
2942 DECL_TI_TEMPLATE (decl) = new_tmpl;
2943 SET_DECL_TEMPLATE_SPECIALIZATION (new_tmpl);
2944 DECL_TEMPLATE_INFO (new_tmpl)
2945 = tree_cons (tmpl, args, NULL_TREE);
2947 register_specialization (new_tmpl,
2948 most_general_template (tmpl),
2953 /* Make sure the template headers we got make sense. */
2955 parms = DECL_TEMPLATE_PARMS (tmpl);
2956 i = TMPL_PARMS_DEPTH (parms);
2957 if (TMPL_ARGS_DEPTH (args) != i)
2959 error ("expected %d levels of template parms for `%#D', got %d",
2960 i, decl, TMPL_ARGS_DEPTH (args));
2963 for (current = decl; i > 0; --i, parms = TREE_CHAIN (parms))
2965 a = TMPL_ARGS_LEVEL (args, i);
2966 t = INNERMOST_TEMPLATE_PARMS (parms);
2968 if (TREE_VEC_LENGTH (t) != TREE_VEC_LENGTH (a))
2970 if (current == decl)
2971 error ("got %d template parameters for `%#D'",
2972 TREE_VEC_LENGTH (a), decl);
2974 error ("got %d template parameters for `%#T'",
2975 TREE_VEC_LENGTH (a), current);
2976 error (" but %d required", TREE_VEC_LENGTH (t));
2979 /* Perhaps we should also check that the parms are used in the
2980 appropriate qualifying scopes in the declarator? */
2982 if (current == decl)
2985 current = TYPE_CONTEXT (current);
2989 DECL_TEMPLATE_RESULT (tmpl) = decl;
2990 TREE_TYPE (tmpl) = TREE_TYPE (decl);
2992 /* Push template declarations for global functions and types. Note
2993 that we do not try to push a global template friend declared in a
2994 template class; such a thing may well depend on the template
2995 parameters of the class. */
2996 if (new_template_p && !ctx
2997 && !(is_friend && template_class_depth (current_class_type) > 0))
2998 tmpl = pushdecl_namespace_level (tmpl);
3002 DECL_PRIMARY_TEMPLATE (tmpl) = tmpl;
3003 if (DECL_CONV_FN_P (tmpl))
3005 int depth = TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (tmpl));
3007 /* It is a conversion operator. See if the type converted to
3008 depends on innermost template operands. */
3010 if (uses_template_parms_level (TREE_TYPE (TREE_TYPE (tmpl)),
3012 DECL_TEMPLATE_CONV_FN_P (tmpl) = 1;
3016 /* The DECL_TI_ARGS of DECL contains full set of arguments referring
3017 back to its most general template. If TMPL is a specialization,
3018 ARGS may only have the innermost set of arguments. Add the missing
3019 argument levels if necessary. */
3020 if (DECL_TEMPLATE_INFO (tmpl))
3021 args = add_outermost_template_args (DECL_TI_ARGS (tmpl), args);
3023 info = tree_cons (tmpl, args, NULL_TREE);
3025 if (DECL_IMPLICIT_TYPEDEF_P (decl))
3027 SET_TYPE_TEMPLATE_INFO (TREE_TYPE (tmpl), info);
3028 if ((!ctx || TREE_CODE (ctx) != FUNCTION_DECL)
3029 && TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE
3030 /* Don't change the name if we've already set it up. */
3031 && !IDENTIFIER_TEMPLATE (DECL_NAME (decl)))
3032 DECL_NAME (decl) = classtype_mangled_name (TREE_TYPE (decl));
3034 else if (DECL_LANG_SPECIFIC (decl))
3035 DECL_TEMPLATE_INFO (decl) = info;
3037 return DECL_TEMPLATE_RESULT (tmpl);
3041 push_template_decl (tree decl)
3043 return push_template_decl_real (decl, 0);
3046 /* Called when a class template TYPE is redeclared with the indicated
3047 template PARMS, e.g.:
3049 template <class T> struct S;
3050 template <class T> struct S {}; */
3053 redeclare_class_template (tree type, tree parms)
3059 if (!TYPE_TEMPLATE_INFO (type))
3061 error ("`%T' is not a template type", type);
3065 tmpl = TYPE_TI_TEMPLATE (type);
3066 if (!PRIMARY_TEMPLATE_P (tmpl))
3067 /* The type is nested in some template class. Nothing to worry
3068 about here; there are no new template parameters for the nested
3072 parms = INNERMOST_TEMPLATE_PARMS (parms);
3073 tmpl_parms = DECL_INNERMOST_TEMPLATE_PARMS (tmpl);
3075 if (TREE_VEC_LENGTH (parms) != TREE_VEC_LENGTH (tmpl_parms))
3077 cp_error_at ("previous declaration `%D'", tmpl);
3078 error ("used %d template parameter%s instead of %d",
3079 TREE_VEC_LENGTH (tmpl_parms),
3080 TREE_VEC_LENGTH (tmpl_parms) == 1 ? "" : "s",
3081 TREE_VEC_LENGTH (parms));
3085 for (i = 0; i < TREE_VEC_LENGTH (tmpl_parms); ++i)
3087 tree tmpl_parm = TREE_VALUE (TREE_VEC_ELT (tmpl_parms, i));
3088 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
3089 tree tmpl_default = TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i));
3090 tree parm_default = TREE_PURPOSE (TREE_VEC_ELT (parms, i));
3092 if (TREE_CODE (tmpl_parm) != TREE_CODE (parm))
3094 cp_error_at ("template parameter `%#D'", tmpl_parm);
3095 error ("redeclared here as `%#D'", parm);
3099 if (tmpl_default != NULL_TREE && parm_default != NULL_TREE)
3101 /* We have in [temp.param]:
3103 A template-parameter may not be given default arguments
3104 by two different declarations in the same scope. */
3105 error ("redefinition of default argument for `%#D'", parm);
3106 error ("%J original definition appeared here", tmpl_parm);
3110 if (parm_default != NULL_TREE)
3111 /* Update the previous template parameters (which are the ones
3112 that will really count) with the new default value. */
3113 TREE_PURPOSE (TREE_VEC_ELT (tmpl_parms, i)) = parm_default;
3114 else if (tmpl_default != NULL_TREE)
3115 /* Update the new parameters, too; they'll be used as the
3116 parameters for any members. */
3117 TREE_PURPOSE (TREE_VEC_ELT (parms, i)) = tmpl_default;
3121 /* Simplify EXPR if it is a non-dependent expression. Returns the
3122 (possibly simplified) expression. */
3125 fold_non_dependent_expr (tree expr)
3127 /* If we're in a template, but EXPR isn't value dependent, simplify
3128 it. We're supposed to treat:
3130 template <typename T> void f(T[1 + 1]);
3131 template <typename T> void f(T[2]);
3133 as two declarations of the same function, for example. */
3134 if (processing_template_decl
3135 && !type_dependent_expression_p (expr)
3136 && !value_dependent_expression_p (expr))
3138 HOST_WIDE_INT saved_processing_template_decl;
3140 saved_processing_template_decl = processing_template_decl;
3141 processing_template_decl = 0;
3142 expr = tsubst_copy_and_build (expr,
3145 /*in_decl=*/NULL_TREE,
3146 /*function_p=*/false);
3147 processing_template_decl = saved_processing_template_decl;
3152 /* Attempt to convert the non-type template parameter EXPR to the
3153 indicated TYPE. If the conversion is successful, return the
3154 converted value. If the conversion is unsuccessful, return
3155 NULL_TREE if we issued an error message, or error_mark_node if we
3156 did not. We issue error messages for out-and-out bad template
3157 parameters, but not simply because the conversion failed, since we
3158 might be just trying to do argument deduction. Both TYPE and EXPR
3159 must be non-dependent. */
3162 convert_nontype_argument (tree type, tree expr)
3166 /* If we are in a template, EXPR may be non-dependent, but still
3167 have a syntactic, rather than semantic, form. For example, EXPR
3168 might be a SCOPE_REF, rather than the VAR_DECL to which the
3169 SCOPE_REF refers. Preserving the qualifying scope is necessary
3170 so that access checking can be performed when the template is
3171 instantiated -- but here we need the resolved form so that we can
3172 convert the argument. */
3173 expr = fold_non_dependent_expr (expr);
3174 expr_type = TREE_TYPE (expr);
3176 /* A template-argument for a non-type, non-template
3177 template-parameter shall be one of:
3179 --an integral constant-expression of integral or enumeration
3182 --the name of a non-type template-parameter; or
3184 --the name of an object or function with external linkage,
3185 including function templates and function template-ids but
3186 excluding non-static class members, expressed as id-expression;
3189 --the address of an object or function with external linkage,
3190 including function templates and function template-ids but
3191 excluding non-static class members, expressed as & id-expression
3192 where the & is optional if the name refers to a function or
3195 --a pointer to member expressed as described in _expr.unary.op_. */
3197 /* An integral constant-expression can include const variables or
3198 . enumerators. Simplify things by folding them to their values,
3199 unless we're about to bind the declaration to a reference
3201 if (INTEGRAL_TYPE_P (expr_type) && TREE_CODE (type) != REFERENCE_TYPE)
3204 tree const_expr = decl_constant_value (expr);
3205 /* In a template, the initializer for a VAR_DECL may not be
3206 marked as TREE_CONSTANT, in which case decl_constant_value
3207 will not return the initializer. Handle that special case
3209 if (expr == const_expr
3210 && TREE_CODE (expr) == VAR_DECL
3211 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (expr)
3212 && CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (expr))
3213 /* DECL_INITIAL can be NULL if we are processing a
3214 variable initialized to an expression involving itself.
3215 We know it is initialized to a constant -- but not what
3217 && DECL_INITIAL (expr))
3218 const_expr = DECL_INITIAL (expr);
3219 if (expr == const_expr)
3221 expr = fold_non_dependent_expr (const_expr);
3224 if (is_overloaded_fn (expr))
3225 /* OK for now. We'll check that it has external linkage later.
3226 Check this first since if expr_type is the unknown_type_node
3227 we would otherwise complain below. */
3229 else if (TYPE_PTR_TO_MEMBER_P (expr_type))
3231 if (TREE_CODE (expr) != PTRMEM_CST)
3234 else if (TYPE_PTR_P (expr_type)
3235 || TREE_CODE (expr_type) == ARRAY_TYPE
3236 || TREE_CODE (type) == REFERENCE_TYPE
3237 /* If expr is the address of an overloaded function, we
3238 will get the unknown_type_node at this point. */
3239 || expr_type == unknown_type_node)
3245 if (TREE_CODE (expr_type) == ARRAY_TYPE
3246 || (TREE_CODE (type) == REFERENCE_TYPE
3247 && TREE_CODE (e) != ADDR_EXPR))
3251 if (TREE_CODE (e) != ADDR_EXPR)
3254 error ("`%E' is not a valid template argument", expr);
3255 if (TYPE_PTR_P (expr_type))
3257 if (TREE_CODE (TREE_TYPE (expr_type)) == FUNCTION_TYPE)
3258 error ("it must be the address of a function with external linkage");
3260 error ("it must be the address of an object with external linkage");
3262 else if (TYPE_PTR_TO_MEMBER_P (expr_type))
3263 error ("it must be a pointer-to-member of the form `&X::Y'");
3268 referent = TREE_OPERAND (e, 0);
3269 STRIP_NOPS (referent);
3272 if (TREE_CODE (referent) == STRING_CST)
3274 error ("string literal %E is not a valid template argument because it is the address of an object with static linkage",
3279 if (TREE_CODE (referent) == SCOPE_REF)
3280 referent = TREE_OPERAND (referent, 1);
3282 if (is_overloaded_fn (referent))
3283 /* We'll check that it has external linkage later. */
3285 else if (TREE_CODE (referent) != VAR_DECL)
3287 else if (!DECL_EXTERNAL_LINKAGE_P (referent))
3289 error ("address of non-extern `%E' cannot be used as template argument", referent);
3290 return error_mark_node;
3293 else if (INTEGRAL_TYPE_P (expr_type) || TYPE_PTR_TO_MEMBER_P (expr_type))
3295 if (! TREE_CONSTANT (expr))
3298 error ("non-constant `%E' cannot be used as template argument",
3306 error ("type '%T' cannot be used as a value for a non-type "
3307 "template-parameter", expr);
3308 else if (DECL_P (expr))
3309 error ("invalid use of '%D' as a non-type template-argument", expr);
3311 error ("invalid use of '%E' as a non-type template-argument", expr);
3316 switch (TREE_CODE (type))
3321 /* For a non-type template-parameter of integral or enumeration
3322 type, integral promotions (_conv.prom_) and integral
3323 conversions (_conv.integral_) are applied. */
3324 if (!INTEGRAL_TYPE_P (expr_type))
3325 return error_mark_node;
3327 /* [conv.integral] does not allow conversions between two different
3328 enumeration types. */
3329 if (TREE_CODE (type) == ENUMERAL_TYPE
3330 && TREE_CODE (expr_type) == ENUMERAL_TYPE
3331 && !same_type_ignoring_top_level_qualifiers_p (type, expr_type))
3332 return error_mark_node;
3334 /* It's safe to call digest_init in this case; we know we're
3335 just converting one integral constant expression to another. */
3336 expr = digest_init (type, expr, (tree*) 0);
3338 if (TREE_CODE (expr) != INTEGER_CST)
3339 /* Curiously, some TREE_CONSTANT integral expressions do not
3340 simplify to integer constants. For example, `3 % 0',
3341 remains a TRUNC_MOD_EXPR. */
3350 /* For a non-type template-parameter of type pointer to data
3351 member, qualification conversions (_conv.qual_) are
3353 e = perform_qualification_conversions (type, expr);
3354 if (TREE_CODE (e) == NOP_EXPR)
3355 /* The call to perform_qualification_conversions will
3356 insert a NOP_EXPR over EXPR to do express conversion,
3357 if necessary. But, that will confuse us if we use
3358 this (converted) template parameter to instantiate
3359 another template; then the thing will not look like a
3360 valid template argument. So, just make a new
3361 constant, of the appropriate type. */
3362 e = make_ptrmem_cst (type, PTRMEM_CST_MEMBER (expr));
3368 tree type_pointed_to = TREE_TYPE (type);
3370 if (TREE_CODE (type_pointed_to) == FUNCTION_TYPE)
3372 /* For a non-type template-parameter of type pointer to
3373 function, only the function-to-pointer conversion
3374 (_conv.func_) is applied. If the template-argument
3375 represents a set of overloaded functions (or a pointer to
3376 such), the matching function is selected from the set
3381 if (TREE_CODE (expr) == ADDR_EXPR)
3382 fns = TREE_OPERAND (expr, 0);
3386 fn = instantiate_type (type_pointed_to, fns, tf_none);
3388 if (fn == error_mark_node)
3389 return error_mark_node;
3391 if (!DECL_EXTERNAL_LINKAGE_P (fn))
3393 if (really_overloaded_fn (fns))
3394 return error_mark_node;
3399 expr = build_unary_op (ADDR_EXPR, fn, 0);
3401 my_friendly_assert (same_type_p (type, TREE_TYPE (expr)),
3407 /* For a non-type template-parameter of type pointer to
3408 object, qualification conversions (_conv.qual_) and the
3409 array-to-pointer conversion (_conv.array_) are applied.
3410 [Note: In particular, neither the null pointer conversion
3411 (_conv.ptr_) nor the derived-to-base conversion
3412 (_conv.ptr_) are applied. Although 0 is a valid
3413 template-argument for a non-type template-parameter of
3414 integral type, it is not a valid template-argument for a
3415 non-type template-parameter of pointer type.]
3417 The call to decay_conversion performs the
3418 array-to-pointer conversion, if appropriate. */
3419 expr = decay_conversion (expr);
3421 if (expr == error_mark_node)
3422 return error_mark_node;
3424 return perform_qualification_conversions (type, expr);
3429 case REFERENCE_TYPE:
3431 tree type_referred_to = TREE_TYPE (type);
3433 /* If this expression already has reference type, get the
3434 underlying object. */
3435 if (TREE_CODE (expr_type) == REFERENCE_TYPE)
3437 if (TREE_CODE (expr) == NOP_EXPR
3438 && TREE_CODE (TREE_OPERAND (expr, 0)) == ADDR_EXPR)
3440 my_friendly_assert (TREE_CODE (expr) == ADDR_EXPR, 20000604);
3441 expr = TREE_OPERAND (expr, 0);
3442 expr_type = TREE_TYPE (expr);
3445 if (TREE_CODE (type_referred_to) == FUNCTION_TYPE)
3447 /* For a non-type template-parameter of type reference to
3448 function, no conversions apply. If the
3449 template-argument represents a set of overloaded
3450 functions, the matching function is selected from the
3451 set (_over.over_). */
3454 fn = instantiate_type (type_referred_to, expr, tf_none);
3456 if (fn == error_mark_node)
3457 return error_mark_node;
3459 if (!DECL_EXTERNAL_LINKAGE_P (fn))
3461 if (really_overloaded_fn (expr))
3462 /* Don't issue an error here; we might get a different
3463 function if the overloading had worked out
3465 return error_mark_node;
3470 my_friendly_assert (same_type_p (type_referred_to,
3478 /* For a non-type template-parameter of type reference to
3479 object, no conversions apply. The type referred to by the
3480 reference may be more cv-qualified than the (otherwise
3481 identical) type of the template-argument. The
3482 template-parameter is bound directly to the
3483 template-argument, which must be an lvalue. */
3484 if (!same_type_p (TYPE_MAIN_VARIANT (expr_type),
3485 TYPE_MAIN_VARIANT (type_referred_to))
3486 || !at_least_as_qualified_p (type_referred_to,
3488 || !real_lvalue_p (expr))
3489 return error_mark_node;
3492 cxx_mark_addressable (expr);
3493 return build_nop (type, build_address (expr));
3499 my_friendly_assert (TYPE_PTRMEMFUNC_P (type), 20010112);
3501 /* For a non-type template-parameter of type pointer to member
3502 function, no conversions apply. If the template-argument
3503 represents a set of overloaded member functions, the
3504 matching member function is selected from the set
3507 if (!TYPE_PTRMEMFUNC_P (expr_type) &&
3508 expr_type != unknown_type_node)
3509 return error_mark_node;
3511 if (TREE_CODE (expr) == PTRMEM_CST)
3513 /* A ptr-to-member constant. */
3514 if (!same_type_p (type, expr_type))
3515 return error_mark_node;
3520 if (TREE_CODE (expr) != ADDR_EXPR)
3521 return error_mark_node;
3523 expr = instantiate_type (type, expr, tf_none);
3525 if (expr == error_mark_node)
3526 return error_mark_node;
3528 if (!same_type_p (type, TREE_TYPE (expr)))
3529 return error_mark_node;
3536 /* All non-type parameters must have one of these types. */
3541 return error_mark_node;
3544 /* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
3545 template template parameters. Both PARM_PARMS and ARG_PARMS are
3546 vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
3549 ARG_PARMS may contain more parameters than PARM_PARMS. If this is
3550 the case, then extra parameters must have default arguments.
3552 Consider the example:
3553 template <class T, class Allocator = allocator> class vector;
3554 template<template <class U> class TT> class C;
3556 C<vector> is a valid instantiation. PARM_PARMS for the above code
3557 contains a TYPE_DECL (for U), ARG_PARMS contains two TYPE_DECLs (for
3558 T and Allocator) and OUTER_ARGS contains the argument that is used to
3559 substitute the TT parameter. */
3562 coerce_template_template_parms (tree parm_parms,
3564 tsubst_flags_t complain,
3568 int nparms, nargs, i;
3571 my_friendly_assert (TREE_CODE (parm_parms) == TREE_VEC, 0);
3572 my_friendly_assert (TREE_CODE (arg_parms) == TREE_VEC, 0);
3574 nparms = TREE_VEC_LENGTH (parm_parms);
3575 nargs = TREE_VEC_LENGTH (arg_parms);
3577 /* The rule here is opposite of coerce_template_parms. */
3580 && TREE_PURPOSE (TREE_VEC_ELT (arg_parms, nparms)) == NULL_TREE))
3583 for (i = 0; i < nparms; ++i)
3585 parm = TREE_VALUE (TREE_VEC_ELT (parm_parms, i));
3586 arg = TREE_VALUE (TREE_VEC_ELT (arg_parms, i));
3588 if (arg == NULL_TREE || arg == error_mark_node
3589 || parm == NULL_TREE || parm == error_mark_node)
3592 if (TREE_CODE (arg) != TREE_CODE (parm))
3595 switch (TREE_CODE (parm))
3601 /* We encounter instantiations of templates like
3602 template <template <template <class> class> class TT>
3605 tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm);
3606 tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg);
3608 if (!coerce_template_template_parms
3609 (parmparm, argparm, complain, in_decl, outer_args))
3615 /* The tsubst call is used to handle cases such as
3616 template <class T, template <T> class TT> class D;
3617 i.e. the parameter list of TT depends on earlier parameters. */
3619 (tsubst (TREE_TYPE (parm), outer_args, complain, in_decl),
3631 /* Convert the indicated template ARG as necessary to match the
3632 indicated template PARM. Returns the converted ARG, or
3633 error_mark_node if the conversion was unsuccessful. Error and
3634 warning messages are issued under control of COMPLAIN. This
3635 conversion is for the Ith parameter in the parameter list. ARGS is
3636 the full set of template arguments deduced so far. */
3639 convert_template_argument (tree parm,
3642 tsubst_flags_t complain,
3648 int is_type, requires_type, is_tmpl_type, requires_tmpl_type;
3650 inner_args = INNERMOST_TEMPLATE_ARGS (args);
3652 if (TREE_CODE (arg) == TREE_LIST
3653 && TREE_CODE (TREE_VALUE (arg)) == OFFSET_REF)
3655 /* The template argument was the name of some
3656 member function. That's usually
3657 invalid, but static members are OK. In any
3658 case, grab the underlying fields/functions
3659 and issue an error later if required. */
3660 arg = TREE_VALUE (arg);
3661 TREE_TYPE (arg) = unknown_type_node;
3664 requires_tmpl_type = TREE_CODE (parm) == TEMPLATE_DECL;
3665 requires_type = (TREE_CODE (parm) == TYPE_DECL
3666 || requires_tmpl_type);
3668 is_tmpl_type = ((TREE_CODE (arg) == TEMPLATE_DECL
3669 && TREE_CODE (DECL_TEMPLATE_RESULT (arg)) == TYPE_DECL)
3670 || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM
3671 || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE);
3674 && (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM
3675 || TREE_CODE (arg) == UNBOUND_CLASS_TEMPLATE))
3676 arg = TYPE_STUB_DECL (arg);
3678 is_type = TYPE_P (arg) || is_tmpl_type;
3680 if (requires_type && ! is_type && TREE_CODE (arg) == SCOPE_REF
3681 && TREE_CODE (TREE_OPERAND (arg, 0)) == TEMPLATE_TYPE_PARM)
3683 pedwarn ("to refer to a type member of a template parameter, use `typename %E'", arg);
3685 arg = make_typename_type (TREE_OPERAND (arg, 0),
3686 TREE_OPERAND (arg, 1),
3687 complain & tf_error);
3690 if (is_type != requires_type)
3694 if (complain & tf_error)
3696 error ("type/value mismatch at argument %d in template parameter list for `%D'",
3699 error (" expected a constant of type `%T', got `%T'",
3701 (is_tmpl_type ? DECL_NAME (arg) : arg));
3702 else if (requires_tmpl_type)
3703 error (" expected a class template, got `%E'", arg);
3705 error (" expected a type, got `%E'", arg);
3708 return error_mark_node;
3710 if (is_tmpl_type ^ requires_tmpl_type)
3712 if (in_decl && (complain & tf_error))
3714 error ("type/value mismatch at argument %d in template parameter list for `%D'",
3717 error (" expected a type, got `%T'", DECL_NAME (arg));
3719 error (" expected a class template, got `%T'", arg);
3721 return error_mark_node;
3726 if (requires_tmpl_type)
3728 if (TREE_CODE (TREE_TYPE (arg)) == UNBOUND_CLASS_TEMPLATE)
3729 /* The number of argument required is not known yet.
3730 Just accept it for now. */
3731 val = TREE_TYPE (arg);
3734 tree parmparm = DECL_INNERMOST_TEMPLATE_PARMS (parm);
3735 tree argparm = DECL_INNERMOST_TEMPLATE_PARMS (arg);
3737 if (coerce_template_template_parms (parmparm, argparm,
3743 /* TEMPLATE_TEMPLATE_PARM node is preferred over
3745 if (val != error_mark_node
3746 && DECL_TEMPLATE_TEMPLATE_PARM_P (val))
3747 val = TREE_TYPE (val);
3751 if (in_decl && (complain & tf_error))
3753 error ("type/value mismatch at argument %d in template parameter list for `%D'",
3755 error (" expected a template of type `%D', got `%D'", parm, arg);
3758 val = error_mark_node;
3767 tree t = tsubst (TREE_TYPE (parm), args, complain, in_decl);
3769 if (invalid_nontype_parm_type_p (t, complain))
3770 return error_mark_node;
3772 if (!uses_template_parms (arg) && !uses_template_parms (t))
3773 /* We used to call digest_init here. However, digest_init
3774 will report errors, which we don't want when complain
3775 is zero. More importantly, digest_init will try too
3776 hard to convert things: for example, `0' should not be
3777 converted to pointer type at this point according to
3778 the standard. Accepting this is not merely an
3779 extension, since deciding whether or not these
3780 conversions can occur is part of determining which
3781 function template to call, or whether a given explicit
3782 argument specification is valid. */
3783 val = convert_nontype_argument (t, arg);
3787 if (val == NULL_TREE)
3788 val = error_mark_node;
3789 else if (val == error_mark_node && (complain & tf_error))
3790 error ("could not convert template argument `%E' to `%T'",
3797 /* Convert all template arguments to their appropriate types, and
3798 return a vector containing the innermost resulting template
3799 arguments. If any error occurs, return error_mark_node. Error and
3800 warning messages are issued under control of COMPLAIN.
3802 If REQUIRE_ALL_ARGUMENTS is nonzero, all arguments must be
3803 provided in ARGLIST, or else trailing parameters must have default
3804 values. If REQUIRE_ALL_ARGUMENTS is zero, we will attempt argument
3805 deduction for any unspecified trailing arguments. */
3808 coerce_template_parms (tree parms,
3811 tsubst_flags_t complain,
3812 int require_all_arguments)
3814 int nparms, nargs, i, lost = 0;
3817 tree new_inner_args;
3819 inner_args = INNERMOST_TEMPLATE_ARGS (args);
3820 nargs = inner_args ? NUM_TMPL_ARGS (inner_args) : 0;
3821 nparms = TREE_VEC_LENGTH (parms);
3825 && require_all_arguments
3826 && TREE_PURPOSE (TREE_VEC_ELT (parms, nargs)) == NULL_TREE))
3828 if (complain & tf_error)
3830 error ("wrong number of template arguments (%d, should be %d)",
3834 cp_error_at ("provided for `%D'", in_decl);
3837 return error_mark_node;
3840 new_inner_args = make_tree_vec (nparms);
3841 new_args = add_outermost_template_args (args, new_inner_args);
3842 for (i = 0; i < nparms; i++)
3847 /* Get the Ith template parameter. */
3848 parm = TREE_VEC_ELT (parms, i);
3850 /* Calculate the Ith argument. */
3852 arg = TREE_VEC_ELT (inner_args, i);
3853 else if (require_all_arguments)
3854 /* There must be a default arg in this case. */
3855 arg = tsubst_template_arg (TREE_PURPOSE (parm), new_args,
3860 my_friendly_assert (arg, 20030727);
3861 if (arg == error_mark_node)
3862 error ("template argument %d is invalid", i + 1);
3864 arg = convert_template_argument (TREE_VALUE (parm),
3865 arg, new_args, complain, i,
3868 if (arg == error_mark_node)
3870 TREE_VEC_ELT (new_inner_args, i) = arg;
3874 return error_mark_node;
3876 return new_inner_args;
3879 /* Returns 1 if template args OT and NT are equivalent. */
3882 template_args_equal (tree ot, tree nt)
3887 if (TREE_CODE (nt) == TREE_VEC)
3888 /* For member templates */
3889 return TREE_CODE (ot) == TREE_VEC && comp_template_args (ot, nt);
3890 else if (TYPE_P (nt))
3891 return TYPE_P (ot) && same_type_p (ot, nt);
3892 else if (TREE_CODE (ot) == TREE_VEC || TYPE_P (ot))
3895 return cp_tree_equal (ot, nt);
3898 /* Returns 1 iff the OLDARGS and NEWARGS are in fact identical sets
3899 of template arguments. Returns 0 otherwise. */
3902 comp_template_args (tree oldargs, tree newargs)
3906 if (TREE_VEC_LENGTH (oldargs) != TREE_VEC_LENGTH (newargs))
3909 for (i = 0; i < TREE_VEC_LENGTH (oldargs); ++i)
3911 tree nt = TREE_VEC_ELT (newargs, i);
3912 tree ot = TREE_VEC_ELT (oldargs, i);
3914 if (! template_args_equal (ot, nt))
3920 /* Given class template name and parameter list, produce a user-friendly name
3921 for the instantiation. */
3924 mangle_class_name_for_template (const char* name, tree parms, tree arglist)
3926 static struct obstack scratch_obstack;
3927 static char *scratch_firstobj;
3930 if (!scratch_firstobj)
3931 gcc_obstack_init (&scratch_obstack);
3933 obstack_free (&scratch_obstack, scratch_firstobj);
3934 scratch_firstobj = obstack_alloc (&scratch_obstack, 1);
3936 #define ccat(C) obstack_1grow (&scratch_obstack, (C));
3937 #define cat(S) obstack_grow (&scratch_obstack, (S), strlen (S))
3941 nparms = TREE_VEC_LENGTH (parms);
3942 arglist = INNERMOST_TEMPLATE_ARGS (arglist);
3943 my_friendly_assert (nparms == TREE_VEC_LENGTH (arglist), 268);
3944 for (i = 0; i < nparms; i++)
3946 tree parm = TREE_VALUE (TREE_VEC_ELT (parms, i));
3947 tree arg = TREE_VEC_ELT (arglist, i);
3952 if (TREE_CODE (parm) == TYPE_DECL)
3954 cat (type_as_string (arg, TFF_CHASE_TYPEDEF));
3957 else if (TREE_CODE (parm) == TEMPLATE_DECL)
3959 if (TREE_CODE (arg) == TEMPLATE_DECL)
3961 /* Already substituted with real template. Just output
3962 the template name here */
3963 tree context = DECL_CONTEXT (arg);
3966 /* The template may be defined in a namespace, or
3967 may be a member template. */
3968 my_friendly_assert (TREE_CODE (context) == NAMESPACE_DECL
3969 || CLASS_TYPE_P (context),
3971 cat(decl_as_string (DECL_CONTEXT (arg), TFF_PLAIN_IDENTIFIER));
3974 cat (IDENTIFIER_POINTER (DECL_NAME (arg)));
3977 /* Output the parameter declaration. */
3978 cat (type_as_string (arg, TFF_CHASE_TYPEDEF));
3982 my_friendly_assert (TREE_CODE (parm) == PARM_DECL, 269);
3984 /* No need to check arglist against parmlist here; we did that
3985 in coerce_template_parms, called from lookup_template_class. */
3986 cat (expr_as_string (arg, TFF_PLAIN_IDENTIFIER));
3989 char *bufp = obstack_next_free (&scratch_obstack);
3991 while (bufp[offset - 1] == ' ')
3993 obstack_blank_fast (&scratch_obstack, offset);
3995 /* B<C<char> >, not B<C<char>> */
3996 if (bufp[offset - 1] == '>')
4001 return (char *) obstack_base (&scratch_obstack);
4005 classtype_mangled_name (tree t)
4007 if (CLASSTYPE_TEMPLATE_INFO (t)
4008 /* Specializations have already had their names set up in
4009 lookup_template_class. */
4010 && !CLASSTYPE_TEMPLATE_SPECIALIZATION (t))
4012 tree tmpl = most_general_template (CLASSTYPE_TI_TEMPLATE (t));
4014 /* For non-primary templates, the template parameters are
4015 implicit from their surrounding context. */
4016 if (PRIMARY_TEMPLATE_P (tmpl))
4018 tree name = DECL_NAME (tmpl);
4019 char *mangled_name = mangle_class_name_for_template
4020 (IDENTIFIER_POINTER (name),
4021 DECL_INNERMOST_TEMPLATE_PARMS (tmpl),
4022 CLASSTYPE_TI_ARGS (t));
4023 tree id = get_identifier (mangled_name);
4024 IDENTIFIER_TEMPLATE (id) = name;
4029 return TYPE_IDENTIFIER (t);
4033 add_pending_template (tree d)
4035 tree ti = (TYPE_P (d)
4036 ? CLASSTYPE_TEMPLATE_INFO (d)
4037 : DECL_TEMPLATE_INFO (d));
4041 if (TI_PENDING_TEMPLATE_FLAG (ti))
4044 /* We are called both from instantiate_decl, where we've already had a
4045 tinst_level pushed, and instantiate_template, where we haven't.
4047 level = !(current_tinst_level && TINST_DECL (current_tinst_level) == d);
4050 push_tinst_level (d);
4052 pt = tree_cons (current_tinst_level, d, NULL_TREE);
4053 if (last_pending_template)
4054 TREE_CHAIN (last_pending_template) = pt;
4056 pending_templates = pt;
4058 last_pending_template = pt;
4060 TI_PENDING_TEMPLATE_FLAG (ti) = 1;
4067 /* Return a TEMPLATE_ID_EXPR corresponding to the indicated FNS and
4068 ARGLIST. Valid choices for FNS are given in the cp-tree.def
4069 documentation for TEMPLATE_ID_EXPR. */
4072 lookup_template_function (tree fns, tree arglist)
4076 if (fns == error_mark_node || arglist == error_mark_node)
4077 return error_mark_node;
4079 my_friendly_assert (!arglist || TREE_CODE (arglist) == TREE_VEC, 20030726);
4080 if (fns == NULL_TREE
4081 || TREE_CODE (fns) == FUNCTION_DECL)
4083 error ("non-template used as template");
4084 return error_mark_node;
4087 my_friendly_assert (TREE_CODE (fns) == TEMPLATE_DECL
4088 || TREE_CODE (fns) == OVERLOAD
4090 || TREE_CODE (fns) == IDENTIFIER_NODE,
4093 if (BASELINK_P (fns))
4095 BASELINK_FUNCTIONS (fns) = build (TEMPLATE_ID_EXPR,
4097 BASELINK_FUNCTIONS (fns),
4102 type = TREE_TYPE (fns);
4103 if (TREE_CODE (fns) == OVERLOAD || !type)
4104 type = unknown_type_node;
4106 return build (TEMPLATE_ID_EXPR, type, fns, arglist);
4109 /* Within the scope of a template class S<T>, the name S gets bound
4110 (in build_self_reference) to a TYPE_DECL for the class, not a
4111 TEMPLATE_DECL. If DECL is a TYPE_DECL for current_class_type,
4112 or one of its enclosing classes, and that type is a template,
4113 return the associated TEMPLATE_DECL. Otherwise, the original
4114 DECL is returned. */
4117 maybe_get_template_decl_from_type_decl (tree decl)
4119 return (decl != NULL_TREE
4120 && TREE_CODE (decl) == TYPE_DECL
4121 && DECL_ARTIFICIAL (decl)
4122 && CLASS_TYPE_P (TREE_TYPE (decl))
4123 && CLASSTYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
4124 ? CLASSTYPE_TI_TEMPLATE (TREE_TYPE (decl)) : decl;
4127 /* Given an IDENTIFIER_NODE (type TEMPLATE_DECL) and a chain of
4128 parameters, find the desired type.
4130 D1 is the PTYPENAME terminal, and ARGLIST is the list of arguments.
4132 IN_DECL, if non-NULL, is the template declaration we are trying to
4135 If ENTERING_SCOPE is nonzero, we are about to enter the scope of
4136 the class we are looking up.
4138 Issue error and warning messages under control of COMPLAIN.
4140 If the template class is really a local class in a template
4141 function, then the FUNCTION_CONTEXT is the function in which it is
4142 being instantiated. */
4145 lookup_template_class (tree d1,
4150 tsubst_flags_t complain)
4152 tree template = NULL_TREE, parmlist;
4155 timevar_push (TV_NAME_LOOKUP);
4157 if (TREE_CODE (d1) == IDENTIFIER_NODE)
4159 tree value = innermost_non_namespace_value (d1);
4160 if (value && DECL_TEMPLATE_TEMPLATE_PARM_P (value))
4165 push_decl_namespace (context);
4166 template = lookup_name (d1, /*prefer_type=*/0);
4167 template = maybe_get_template_decl_from_type_decl (template);
4169 pop_decl_namespace ();
4172 context = DECL_CONTEXT (template);
4174 else if (TREE_CODE (d1) == TYPE_DECL && IS_AGGR_TYPE (TREE_TYPE (d1)))
4176 tree type = TREE_TYPE (d1);
4178 /* If we are declaring a constructor, say A<T>::A<T>, we will get
4179 an implicit typename for the second A. Deal with it. */
4180 if (TREE_CODE (type) == TYPENAME_TYPE && TREE_TYPE (type))
4181 type = TREE_TYPE (type);
4183 if (CLASSTYPE_TEMPLATE_INFO (type))
4185 template = CLASSTYPE_TI_TEMPLATE (type);
4186 d1 = DECL_NAME (template);
4189 else if (TREE_CODE (d1) == ENUMERAL_TYPE
4190 || (TYPE_P (d1) && IS_AGGR_TYPE (d1)))
4192 template = TYPE_TI_TEMPLATE (d1);
4193 d1 = DECL_NAME (template);
4195 else if (TREE_CODE (d1) == TEMPLATE_DECL
4196 && TREE_CODE (DECL_TEMPLATE_RESULT (d1)) == TYPE_DECL)
4199 d1 = DECL_NAME (template);
4200 context = DECL_CONTEXT (template);
4203 /* Issue an error message if we didn't find a template. */
4206 if (complain & tf_error)
4207 error ("`%T' is not a template", d1);
4208 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4211 if (TREE_CODE (template) != TEMPLATE_DECL
4212 /* Make sure it's a user visible template, if it was named by
4214 || ((complain & tf_user) && !DECL_TEMPLATE_PARM_P (template)
4215 && !PRIMARY_TEMPLATE_P (template)))
4217 if (complain & tf_error)
4219 error ("non-template type `%T' used as a template", d1);
4221 cp_error_at ("for template declaration `%D'", in_decl);
4223 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4226 complain &= ~tf_user;
4228 if (DECL_TEMPLATE_TEMPLATE_PARM_P (template))
4230 /* Create a new TEMPLATE_DECL and TEMPLATE_TEMPLATE_PARM node to store
4231 template arguments */
4236 parmlist = DECL_INNERMOST_TEMPLATE_PARMS (template);
4238 /* Consider an example where a template template parameter declared as
4240 template <class T, class U = std::allocator<T> > class TT
4242 The template parameter level of T and U are one level larger than
4243 of TT. To proper process the default argument of U, say when an
4244 instantiation `TT<int>' is seen, we need to build the full
4245 arguments containing {int} as the innermost level. Outer levels,
4246 available when not appearing as default template argument, can be
4247 obtained from `current_template_args ()'.
4249 Suppose that TT is later substituted with std::vector. The above
4250 instantiation is `TT<int, std::allocator<T> >' with TT at
4251 level 1, and T at level 2, while the template arguments at level 1
4252 becomes {std::vector} and the inner level 2 is {int}. */
4254 if (current_template_parms)
4255 arglist = add_to_template_args (current_template_args (), arglist);
4257 arglist2 = coerce_template_parms (parmlist, arglist, template,
4258 complain, /*require_all_args=*/1);
4259 if (arglist2 == error_mark_node
4260 || (!uses_template_parms (arglist2)
4261 && check_instantiated_args (template, arglist2, complain)))
4262 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4264 parm = bind_template_template_parm (TREE_TYPE (template), arglist2);
4265 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, parm);
4269 tree template_type = TREE_TYPE (template);
4272 tree found = NULL_TREE;
4276 int is_partial_instantiation;
4278 gen_tmpl = most_general_template (template);
4279 parmlist = DECL_TEMPLATE_PARMS (gen_tmpl);
4280 parm_depth = TMPL_PARMS_DEPTH (parmlist);
4281 arg_depth = TMPL_ARGS_DEPTH (arglist);
4283 if (arg_depth == 1 && parm_depth > 1)
4285 /* We've been given an incomplete set of template arguments.
4288 template <class T> struct S1 {
4289 template <class U> struct S2 {};
4290 template <class U> struct S2<U*> {};
4293 we will be called with an ARGLIST of `U*', but the
4294 TEMPLATE will be `template <class T> template
4295 <class U> struct S1<T>::S2'. We must fill in the missing
4298 = add_outermost_template_args (TYPE_TI_ARGS (TREE_TYPE (template)),
4300 arg_depth = TMPL_ARGS_DEPTH (arglist);
4303 /* Now we should have enough arguments. */
4304 my_friendly_assert (parm_depth == arg_depth, 0);
4306 /* From here on, we're only interested in the most general
4308 template = gen_tmpl;
4310 /* Calculate the BOUND_ARGS. These will be the args that are
4311 actually tsubst'd into the definition to create the
4315 /* We have multiple levels of arguments to coerce, at once. */
4317 int saved_depth = TMPL_ARGS_DEPTH (arglist);
4319 tree bound_args = make_tree_vec (parm_depth);
4321 for (i = saved_depth,
4322 t = DECL_TEMPLATE_PARMS (template);
4323 i > 0 && t != NULL_TREE;
4324 --i, t = TREE_CHAIN (t))
4326 tree a = coerce_template_parms (TREE_VALUE (t),
4328 complain, /*require_all_args=*/1);
4330 /* Don't process further if one of the levels fails. */
4331 if (a == error_mark_node)
4333 /* Restore the ARGLIST to its full size. */
4334 TREE_VEC_LENGTH (arglist) = saved_depth;
4335 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4338 SET_TMPL_ARGS_LEVEL (bound_args, i, a);
4340 /* We temporarily reduce the length of the ARGLIST so
4341 that coerce_template_parms will see only the arguments
4342 corresponding to the template parameters it is
4344 TREE_VEC_LENGTH (arglist)--;
4347 /* Restore the ARGLIST to its full size. */
4348 TREE_VEC_LENGTH (arglist) = saved_depth;
4350 arglist = bound_args;
4354 = coerce_template_parms (INNERMOST_TEMPLATE_PARMS (parmlist),
4355 INNERMOST_TEMPLATE_ARGS (arglist),
4357 complain, /*require_all_args=*/1);
4359 if (arglist == error_mark_node)
4360 /* We were unable to bind the arguments. */
4361 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4363 /* In the scope of a template class, explicit references to the
4364 template class refer to the type of the template, not any
4365 instantiation of it. For example, in:
4367 template <class T> class C { void f(C<T>); }
4369 the `C<T>' is just the same as `C'. Outside of the
4370 class, however, such a reference is an instantiation. */
4371 if (comp_template_args (TYPE_TI_ARGS (template_type),
4374 found = template_type;
4376 if (!entering_scope && PRIMARY_TEMPLATE_P (template))
4380 for (ctx = current_class_type;
4381 ctx && TREE_CODE (ctx) != NAMESPACE_DECL;
4383 ? TYPE_CONTEXT (ctx)
4384 : DECL_CONTEXT (ctx)))
4385 if (TYPE_P (ctx) && same_type_p (ctx, template_type))
4388 /* We're not in the scope of the class, so the
4389 TEMPLATE_TYPE is not the type we want after all. */
4395 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found);
4397 for (tp = &DECL_TEMPLATE_INSTANTIATIONS (template);
4399 tp = &TREE_CHAIN (*tp))
4400 if (comp_template_args (TREE_PURPOSE (*tp), arglist))
4404 /* Use the move-to-front heuristic to speed up future
4406 *tp = TREE_CHAIN (*tp);
4408 = DECL_TEMPLATE_INSTANTIATIONS (template);
4409 DECL_TEMPLATE_INSTANTIATIONS (template) = found;
4411 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, TREE_VALUE (found));
4414 /* This type is a "partial instantiation" if any of the template
4415 arguments still involve template parameters. Note that we set
4416 IS_PARTIAL_INSTANTIATION for partial specializations as
4418 is_partial_instantiation = uses_template_parms (arglist);
4420 /* If the deduced arguments are invalid, then the binding
4422 if (!is_partial_instantiation
4423 && check_instantiated_args (template,
4424 INNERMOST_TEMPLATE_ARGS (arglist),
4426 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
4428 if (!is_partial_instantiation
4429 && !PRIMARY_TEMPLATE_P (template)
4430 && TREE_CODE (CP_DECL_CONTEXT (template)) == NAMESPACE_DECL)
4432 found = xref_tag_from_type (TREE_TYPE (template),
4433 DECL_NAME (template),
4435 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, found);
4438 context = tsubst (DECL_CONTEXT (template), arglist,
4441 context = global_namespace;
4443 /* Create the type. */
4444 if (TREE_CODE (template_type) == ENUMERAL_TYPE)
4446 if (!is_partial_instantiation)
4448 set_current_access_from_decl (TYPE_NAME (template_type));
4449 t = start_enum (TYPE_IDENTIFIER (template_type));
4452 /* We don't want to call start_enum for this type, since
4453 the values for the enumeration constants may involve
4454 template parameters. And, no one should be interested
4455 in the enumeration constants for such a type. */
4456 t = make_node (ENUMERAL_TYPE);
4460 t = make_aggr_type (TREE_CODE (template_type));
4461 CLASSTYPE_DECLARED_CLASS (t)
4462 = CLASSTYPE_DECLARED_CLASS (template_type);
4463 SET_CLASSTYPE_IMPLICIT_INSTANTIATION (t);
4464 TYPE_FOR_JAVA (t) = TYPE_FOR_JAVA (template_type);
4466 /* A local class. Make sure the decl gets registered properly. */
4467 if (context == current_function_decl)
4468 pushtag (DECL_NAME (template), t, 0);
4471 /* If we called start_enum or pushtag above, this information
4472 will already be set up. */
4475 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
4477 type_decl = create_implicit_typedef (DECL_NAME (template), t);
4478 DECL_CONTEXT (type_decl) = TYPE_CONTEXT (t);
4479 TYPE_STUB_DECL (t) = type_decl;
4480 DECL_SOURCE_LOCATION (type_decl)
4481 = DECL_SOURCE_LOCATION (TYPE_STUB_DECL (template_type));
4484 type_decl = TYPE_NAME (t);
4486 TREE_PRIVATE (type_decl)
4487 = TREE_PRIVATE (TYPE_STUB_DECL (template_type));
4488 TREE_PROTECTED (type_decl)
4489 = TREE_PROTECTED (TYPE_STUB_DECL (template_type));
4491 /* Set up the template information. We have to figure out which
4492 template is the immediate parent if this is a full
4494 if (parm_depth == 1 || is_partial_instantiation
4495 || !PRIMARY_TEMPLATE_P (template))
4496 /* This case is easy; there are no member templates involved. */
4500 /* This is a full instantiation of a member template. Look
4501 for a partial instantiation of which this is an instance. */
4503 for (found = DECL_TEMPLATE_INSTANTIATIONS (template);
4504 found; found = TREE_CHAIN (found))
4507 tree tmpl = CLASSTYPE_TI_TEMPLATE (TREE_VALUE (found));
4509 /* We only want partial instantiations, here, not
4510 specializations or full instantiations. */
4511 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_VALUE (found))
4512 || !uses_template_parms (TREE_VALUE (found)))
4515 /* Temporarily reduce by one the number of levels in the
4516 ARGLIST and in FOUND so as to avoid comparing the
4517 last set of arguments. */
4518 TREE_VEC_LENGTH (arglist)--;
4519 TREE_VEC_LENGTH (TREE_PURPOSE (found)) --;
4521 /* See if the arguments match. If they do, then TMPL is
4522 the partial instantiation we want. */
4523 success = comp_template_args (TREE_PURPOSE (found), arglist);
4525 /* Restore the argument vectors to their full size. */
4526 TREE_VEC_LENGTH (arglist)++;
4527 TREE_VEC_LENGTH (TREE_PURPOSE (found))++;
4538 /* There was no partial instantiation. This happens
4539 where C<T> is a member template of A<T> and it's used
4542 template <typename T> struct B { A<T>::C<int> m; };
4545 Create the partial instantiation.
4547 TREE_VEC_LENGTH (arglist)--;
4548 found = tsubst (template, arglist, complain, NULL_TREE);
4549 TREE_VEC_LENGTH (arglist)++;
4553 SET_TYPE_TEMPLATE_INFO (t, tree_cons (found, arglist, NULL_TREE));
4554 DECL_TEMPLATE_INSTANTIATIONS (template)
4555 = tree_cons (arglist, t,
4556 DECL_TEMPLATE_INSTANTIATIONS (template));
4558 if (TREE_CODE (t) == ENUMERAL_TYPE
4559 && !is_partial_instantiation)
4560 /* Now that the type has been registered on the instantiations
4561 list, we set up the enumerators. Because the enumeration
4562 constants may involve the enumeration type itself, we make
4563 sure to register the type first, and then create the
4564 constants. That way, doing tsubst_expr for the enumeration
4565 constants won't result in recursive calls here; we'll find
4566 the instantiation and exit above. */
4567 tsubst_enum (template_type, t, arglist);
4569 /* Reset the name of the type, now that CLASSTYPE_TEMPLATE_INFO
4571 if (TREE_CODE (t) != ENUMERAL_TYPE)
4572 DECL_NAME (type_decl) = classtype_mangled_name (t);
4573 if (is_partial_instantiation)
4574 /* If the type makes use of template parameters, the
4575 code that generates debugging information will crash. */
4576 DECL_IGNORED_P (TYPE_STUB_DECL (t)) = 1;
4578 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
4580 timevar_pop (TV_NAME_LOOKUP);
4590 /* Called from for_each_template_parm via walk_tree. */
4593 for_each_template_parm_r (tree *tp, int *walk_subtrees, void *d)
4596 struct pair_fn_data *pfd = (struct pair_fn_data *) d;
4597 tree_fn_t fn = pfd->fn;
4598 void *data = pfd->data;
4601 && for_each_template_parm (TYPE_CONTEXT (t), fn, data, pfd->visited))
4602 return error_mark_node;
4604 switch (TREE_CODE (t))
4607 if (TYPE_PTRMEMFUNC_P (t))
4613 if (!TYPE_TEMPLATE_INFO (t))
4615 else if (for_each_template_parm (TREE_VALUE (TYPE_TEMPLATE_INFO (t)),
4616 fn, data, pfd->visited))
4617 return error_mark_node;
4621 /* Since we're not going to walk subtrees, we have to do this
4623 if (for_each_template_parm (TYPE_METHOD_BASETYPE (t), fn, data,
4625 return error_mark_node;
4629 /* Check the return type. */
4630 if (for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited))
4631 return error_mark_node;
4633 /* Check the parameter types. Since default arguments are not
4634 instantiated until they are needed, the TYPE_ARG_TYPES may
4635 contain expressions that involve template parameters. But,
4636 no-one should be looking at them yet. And, once they're
4637 instantiated, they don't contain template parameters, so
4638 there's no point in looking at them then, either. */
4642 for (parm = TYPE_ARG_TYPES (t); parm; parm = TREE_CHAIN (parm))
4643 if (for_each_template_parm (TREE_VALUE (parm), fn, data,
4645 return error_mark_node;
4647 /* Since we've already handled the TYPE_ARG_TYPES, we don't
4648 want walk_tree walking into them itself. */
4654 if (for_each_template_parm (TYPE_FIELDS (t), fn, data,
4656 return error_mark_node;
4661 if (DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t)
4662 && for_each_template_parm (DECL_TI_ARGS (t), fn, data,
4664 return error_mark_node;
4669 if (TREE_CODE (t) == CONST_DECL && DECL_TEMPLATE_PARM_P (t)
4670 && for_each_template_parm (DECL_INITIAL (t), fn, data,
4672 return error_mark_node;
4673 if (DECL_CONTEXT (t)
4674 && for_each_template_parm (DECL_CONTEXT (t), fn, data,
4676 return error_mark_node;
4679 case BOUND_TEMPLATE_TEMPLATE_PARM:
4680 /* Record template parameters such as `T' inside `TT<T>'. */
4681 if (for_each_template_parm (TYPE_TI_ARGS (t), fn, data, pfd->visited))
4682 return error_mark_node;
4685 case TEMPLATE_TEMPLATE_PARM:
4686 case TEMPLATE_TYPE_PARM:
4687 case TEMPLATE_PARM_INDEX:
4688 if (fn && (*fn)(t, data))
4689 return error_mark_node;
4691 return error_mark_node;
4695 /* A template template parameter is encountered. */
4696 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t)
4697 && for_each_template_parm (TREE_TYPE (t), fn, data, pfd->visited))
4698 return error_mark_node;
4700 /* Already substituted template template parameter */
4706 || for_each_template_parm (TYPENAME_TYPE_FULLNAME (t), fn,
4707 data, pfd->visited))
4708 return error_mark_node;
4712 if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t))
4713 && for_each_template_parm (TYPE_PTRMEMFUNC_FN_TYPE
4714 (TREE_TYPE (t)), fn, data,
4716 return error_mark_node;
4721 /* If there's no type, then this thing must be some expression
4722 involving template parameters. */
4723 if (!fn && !TREE_TYPE (t))
4724 return error_mark_node;
4729 case REINTERPRET_CAST_EXPR:
4730 case CONST_CAST_EXPR:
4731 case STATIC_CAST_EXPR:
4732 case DYNAMIC_CAST_EXPR:
4736 case PSEUDO_DTOR_EXPR:
4738 return error_mark_node;
4742 /* If we do not handle this case specially, we end up walking
4743 the BINFO hierarchy, which is circular, and therefore
4744 confuses walk_tree. */
4746 if (for_each_template_parm (BASELINK_FUNCTIONS (*tp), fn, data,
4748 return error_mark_node;
4755 /* We didn't find any template parameters we liked. */
4759 /* For each TEMPLATE_TYPE_PARM, TEMPLATE_TEMPLATE_PARM,
4760 BOUND_TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX in T,
4761 call FN with the parameter and the DATA.
4762 If FN returns nonzero, the iteration is terminated, and
4763 for_each_template_parm returns 1. Otherwise, the iteration
4764 continues. If FN never returns a nonzero value, the value
4765 returned by for_each_template_parm is 0. If FN is NULL, it is
4766 considered to be the function which always returns 1. */
4769 for_each_template_parm (tree t, tree_fn_t fn, void* data, htab_t visited)
4771 struct pair_fn_data pfd;
4778 /* Walk the tree. (Conceptually, we would like to walk without
4779 duplicates, but for_each_template_parm_r recursively calls
4780 for_each_template_parm, so we would need to reorganize a fair
4781 bit to use walk_tree_without_duplicates, so we keep our own
4784 pfd.visited = visited;
4786 pfd.visited = htab_create (37, htab_hash_pointer, htab_eq_pointer,
4788 result = walk_tree (&t,
4789 for_each_template_parm_r,
4791 pfd.visited) != NULL_TREE;
4795 htab_delete (pfd.visited);
4800 /* Returns true if T depends on any template parameter. */
4803 uses_template_parms (tree t)
4806 int saved_processing_template_decl;
4808 saved_processing_template_decl = processing_template_decl;
4809 if (!saved_processing_template_decl)
4810 processing_template_decl = 1;
4812 dependent_p = dependent_type_p (t);
4813 else if (TREE_CODE (t) == TREE_VEC)
4814 dependent_p = any_dependent_template_arguments_p (t);
4815 else if (TREE_CODE (t) == TREE_LIST)
4816 dependent_p = (uses_template_parms (TREE_VALUE (t))
4817 || uses_template_parms (TREE_CHAIN (t)));
4820 || TREE_CODE (t) == TEMPLATE_PARM_INDEX
4821 || TREE_CODE (t) == OVERLOAD
4822 || TREE_CODE (t) == BASELINK
4823 || TREE_CODE_CLASS (TREE_CODE (t)) == 'c')
4824 dependent_p = (type_dependent_expression_p (t)
4825 || value_dependent_expression_p (t));
4826 else if (t == error_mark_node)
4827 dependent_p = false;
4830 processing_template_decl = saved_processing_template_decl;
4835 /* Returns true if T depends on any template parameter with level LEVEL. */
4838 uses_template_parms_level (tree t, int level)
4840 return for_each_template_parm (t, template_parm_this_level_p, &level, NULL);
4843 static int tinst_depth;
4844 extern int max_tinst_depth;
4845 #ifdef GATHER_STATISTICS
4848 static int tinst_level_tick;
4849 static int last_template_error_tick;
4851 /* We're starting to instantiate D; record the template instantiation context
4852 for diagnostics and to restore it later. */
4855 push_tinst_level (tree d)
4859 if (tinst_depth >= max_tinst_depth)
4861 /* If the instantiation in question still has unbound template parms,
4862 we don't really care if we can't instantiate it, so just return.
4863 This happens with base instantiation for implicit `typename'. */
4864 if (uses_template_parms (d))
4867 last_template_error_tick = tinst_level_tick;
4868 error ("template instantiation depth exceeds maximum of %d (use -ftemplate-depth-NN to increase the maximum) instantiating `%D'",
4869 max_tinst_depth, d);
4871 print_instantiation_context ();
4876 new = make_node (TINST_LEVEL);
4877 SET_EXPR_LOCATION (new, input_location);
4878 TINST_DECL (new) = d;
4879 TREE_CHAIN (new) = current_tinst_level;
4880 current_tinst_level = new;
4883 #ifdef GATHER_STATISTICS
4884 if (tinst_depth > depth_reached)
4885 depth_reached = tinst_depth;
4892 /* We're done instantiating this template; return to the instantiation
4896 pop_tinst_level (void)
4898 tree old = current_tinst_level;
4900 /* Restore the filename and line number stashed away when we started
4901 this instantiation. */
4902 input_location = EXPR_LOCATION (old);
4903 extract_interface_info ();
4905 current_tinst_level = TREE_CHAIN (old);
4910 /* We're instantiating a deferred template; restore the template
4911 instantiation context in which the instantiation was requested, which
4912 is one step out from LEVEL. */
4915 reopen_tinst_level (tree level)
4920 for (t = level; t; t = TREE_CHAIN (t))
4923 current_tinst_level = level;
4927 /* Return the outermost template instantiation context, for use with
4928 -falt-external-templates. */
4931 tinst_for_decl (void)
4933 tree p = current_tinst_level;
4936 for (; TREE_CHAIN (p) ; p = TREE_CHAIN (p))
4941 /* DECL is a friend FUNCTION_DECL or TEMPLATE_DECL. ARGS is the
4942 vector of template arguments, as for tsubst.
4944 Returns an appropriate tsubst'd friend declaration. */
4947 tsubst_friend_function (tree decl, tree args)
4950 location_t saved_loc = input_location;
4952 input_location = DECL_SOURCE_LOCATION (decl);
4954 if (TREE_CODE (decl) == FUNCTION_DECL
4955 && DECL_TEMPLATE_INSTANTIATION (decl)
4956 && TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL)
4957 /* This was a friend declared with an explicit template
4958 argument list, e.g.:
4962 to indicate that f was a template instantiation, not a new
4963 function declaration. Now, we have to figure out what
4964 instantiation of what template. */
4966 tree template_id, arglist, fns;
4969 tree ns = decl_namespace_context (TYPE_MAIN_DECL (current_class_type));
4971 /* Friend functions are looked up in the containing namespace scope.
4972 We must enter that scope, to avoid finding member functions of the
4973 current cless with same name. */
4974 push_nested_namespace (ns);
4975 fns = tsubst_expr (DECL_TI_TEMPLATE (decl), args,
4976 tf_error | tf_warning, NULL_TREE);
4977 pop_nested_namespace (ns);
4978 arglist = tsubst (DECL_TI_ARGS (decl), args,
4979 tf_error | tf_warning, NULL_TREE);
4980 template_id = lookup_template_function (fns, arglist);
4982 new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE);
4983 tmpl = determine_specialization (template_id, new_friend,
4985 /*need_member_template=*/0);
4986 new_friend = instantiate_template (tmpl, new_args, tf_error);
4990 new_friend = tsubst (decl, args, tf_error | tf_warning, NULL_TREE);
4992 /* The NEW_FRIEND will look like an instantiation, to the
4993 compiler, but is not an instantiation from the point of view of
4994 the language. For example, we might have had:
4996 template <class T> struct S {
4997 template <class U> friend void f(T, U);
5000 Then, in S<int>, template <class U> void f(int, U) is not an
5001 instantiation of anything. */
5002 if (new_friend == error_mark_node)
5003 return error_mark_node;
5005 DECL_USE_TEMPLATE (new_friend) = 0;
5006 if (TREE_CODE (decl) == TEMPLATE_DECL)
5008 DECL_USE_TEMPLATE (DECL_TEMPLATE_RESULT (new_friend)) = 0;
5009 DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (new_friend))
5010 = DECL_SAVED_TREE (DECL_TEMPLATE_RESULT (decl));
5013 /* The mangled name for the NEW_FRIEND is incorrect. The function
5014 is not a template instantiation and should not be mangled like
5015 one. Therefore, we forget the mangling here; we'll recompute it
5016 later if we need it. */
5017 if (TREE_CODE (new_friend) != TEMPLATE_DECL)
5019 SET_DECL_RTL (new_friend, NULL_RTX);
5020 SET_DECL_ASSEMBLER_NAME (new_friend, NULL_TREE);
5023 if (DECL_NAMESPACE_SCOPE_P (new_friend))
5026 tree new_friend_template_info;
5027 tree new_friend_result_template_info;
5029 int new_friend_is_defn;
5031 /* We must save some information from NEW_FRIEND before calling
5032 duplicate decls since that function will free NEW_FRIEND if
5034 new_friend_template_info = DECL_TEMPLATE_INFO (new_friend);
5035 new_friend_is_defn =
5036 (DECL_INITIAL (DECL_TEMPLATE_RESULT
5037 (template_for_substitution (new_friend)))
5039 if (TREE_CODE (new_friend) == TEMPLATE_DECL)
5041 /* This declaration is a `primary' template. */
5042 DECL_PRIMARY_TEMPLATE (new_friend) = new_friend;
5044 new_friend_result_template_info
5045 = DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (new_friend));
5048 new_friend_result_template_info = NULL_TREE;
5050 /* Inside pushdecl_namespace_level, we will push into the
5051 current namespace. However, the friend function should go
5052 into the namespace of the template. */
5053 ns = decl_namespace_context (new_friend);
5054 push_nested_namespace (ns);
5055 old_decl = pushdecl_namespace_level (new_friend);
5056 pop_nested_namespace (ns);
5058 if (old_decl != new_friend)
5060 /* This new friend declaration matched an existing
5061 declaration. For example, given:
5063 template <class T> void f(T);
5064 template <class U> class C {
5065 template <class T> friend void f(T) {}
5068 the friend declaration actually provides the definition
5069 of `f', once C has been instantiated for some type. So,
5070 old_decl will be the out-of-class template declaration,
5071 while new_friend is the in-class definition.
5073 But, if `f' was called before this point, the
5074 instantiation of `f' will have DECL_TI_ARGS corresponding
5075 to `T' but not to `U', references to which might appear
5076 in the definition of `f'. Previously, the most general
5077 template for an instantiation of `f' was the out-of-class
5078 version; now it is the in-class version. Therefore, we
5079 run through all specialization of `f', adding to their
5080 DECL_TI_ARGS appropriately. In particular, they need a
5081 new set of outer arguments, corresponding to the
5082 arguments for this class instantiation.
5084 The same situation can arise with something like this:
5087 template <class T> class C {
5091 when `C<int>' is instantiated. Now, `f(int)' is defined
5094 if (!new_friend_is_defn)
5095 /* On the other hand, if the in-class declaration does
5096 *not* provide a definition, then we don't want to alter
5097 existing definitions. We can just leave everything
5102 /* Overwrite whatever template info was there before, if
5103 any, with the new template information pertaining to
5105 DECL_TEMPLATE_INFO (old_decl) = new_friend_template_info;
5107 if (TREE_CODE (old_decl) != TEMPLATE_DECL)
5108 reregister_specialization (new_friend,
5109 most_general_template (old_decl),
5114 tree new_friend_args;
5116 DECL_TEMPLATE_INFO (DECL_TEMPLATE_RESULT (old_decl))
5117 = new_friend_result_template_info;
5119 new_friend_args = TI_ARGS (new_friend_template_info);
5120 for (t = DECL_TEMPLATE_SPECIALIZATIONS (old_decl);
5124 tree spec = TREE_VALUE (t);
5127 = add_outermost_template_args (new_friend_args,
5128 DECL_TI_ARGS (spec));
5131 /* Now, since specializations are always supposed to
5132 hang off of the most general template, we must move
5134 t = most_general_template (old_decl);
5137 DECL_TEMPLATE_SPECIALIZATIONS (t)
5138 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (t),
5139 DECL_TEMPLATE_SPECIALIZATIONS (old_decl));
5140 DECL_TEMPLATE_SPECIALIZATIONS (old_decl) = NULL_TREE;
5145 /* The information from NEW_FRIEND has been merged into OLD_DECL
5146 by duplicate_decls. */
5147 new_friend = old_decl;
5150 else if (COMPLETE_TYPE_P (DECL_CONTEXT (new_friend)))
5152 /* Check to see that the declaration is really present, and,
5153 possibly obtain an improved declaration. */
5154 tree fn = check_classfn (DECL_CONTEXT (new_friend),
5155 new_friend, NULL_TREE);
5162 input_location = saved_loc;
5166 /* FRIEND_TMPL is a friend TEMPLATE_DECL. ARGS is the vector of
5167 template arguments, as for tsubst.
5169 Returns an appropriate tsubst'd friend type or error_mark_node on
5173 tsubst_friend_class (tree friend_tmpl, tree args)
5179 context = DECL_CONTEXT (friend_tmpl);
5183 if (TREE_CODE (context) == NAMESPACE_DECL)
5184 push_nested_namespace (context);
5186 push_nested_class (tsubst (context, args, tf_none, NULL_TREE));
5189 /* First, we look for a class template. */
5190 tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/0);
5192 /* But, if we don't find one, it might be because we're in a
5193 situation like this:
5201 Here, in the scope of (say) S<int>, `S' is bound to a TYPE_DECL
5202 for `S<int>', not the TEMPLATE_DECL. */
5203 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
5205 tmpl = lookup_name (DECL_NAME (friend_tmpl), /*prefer_type=*/1);
5206 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
5209 if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl))
5211 /* The friend template has already been declared. Just
5212 check to see that the declarations match, and install any new
5213 default parameters. We must tsubst the default parameters,
5214 of course. We only need the innermost template parameters
5215 because that is all that redeclare_class_template will look
5217 if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl))
5218 > TMPL_ARGS_DEPTH (args))
5221 parms = tsubst_template_parms (DECL_TEMPLATE_PARMS (friend_tmpl),
5222 args, tf_error | tf_warning);
5223 redeclare_class_template (TREE_TYPE (tmpl), parms);
5226 friend_type = TREE_TYPE (tmpl);
5230 /* The friend template has not already been declared. In this
5231 case, the instantiation of the template class will cause the
5232 injection of this template into the global scope. */
5233 tmpl = tsubst (friend_tmpl, args, tf_error | tf_warning, NULL_TREE);
5235 /* The new TMPL is not an instantiation of anything, so we
5236 forget its origins. We don't reset CLASSTYPE_TI_TEMPLATE for
5237 the new type because that is supposed to be the corresponding
5238 template decl, i.e., TMPL. */
5239 DECL_USE_TEMPLATE (tmpl) = 0;
5240 DECL_TEMPLATE_INFO (tmpl) = NULL_TREE;
5241 CLASSTYPE_USE_TEMPLATE (TREE_TYPE (tmpl)) = 0;
5242 CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl))
5243 = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl)));
5245 /* Inject this template into the global scope. */
5246 friend_type = TREE_TYPE (pushdecl_top_level (tmpl));
5251 if (TREE_CODE (context) == NAMESPACE_DECL)
5252 pop_nested_namespace (context);
5254 pop_nested_class ();
5260 /* Returns zero if TYPE cannot be completed later due to circularity.
5261 Otherwise returns one. */
5264 can_complete_type_without_circularity (tree type)
5266 if (type == NULL_TREE || type == error_mark_node)
5268 else if (COMPLETE_TYPE_P (type))
5270 else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type))
5271 return can_complete_type_without_circularity (TREE_TYPE (type));
5272 else if (CLASS_TYPE_P (type)
5273 && TYPE_BEING_DEFINED (TYPE_MAIN_VARIANT (type)))
5280 instantiate_class_template (tree type)
5282 tree template, args, pattern, t, member;
5287 if (type == error_mark_node)
5288 return error_mark_node;
5290 if (TYPE_BEING_DEFINED (type)
5291 || COMPLETE_TYPE_P (type)
5292 || dependent_type_p (type))
5295 /* Figure out which template is being instantiated. */
5296 template = most_general_template (CLASSTYPE_TI_TEMPLATE (type));
5297 my_friendly_assert (TREE_CODE (template) == TEMPLATE_DECL, 279);
5299 /* Figure out which arguments are being used to do the
5301 args = CLASSTYPE_TI_ARGS (type);
5303 /* Determine what specialization of the original template to
5305 t = most_specialized_class (template, args);
5306 if (t == error_mark_node)
5308 const char *str = "candidates are:";
5309 error ("ambiguous class template instantiation for `%#T'", type);
5310 for (t = DECL_TEMPLATE_SPECIALIZATIONS (template); t;
5313 if (get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args))
5315 cp_error_at ("%s %+#T", str, TREE_TYPE (t));
5319 TYPE_BEING_DEFINED (type) = 1;
5320 return error_mark_node;
5324 pattern = TREE_TYPE (t);
5326 pattern = TREE_TYPE (template);
5328 /* If the template we're instantiating is incomplete, then clearly
5329 there's nothing we can do. */
5330 if (!COMPLETE_TYPE_P (pattern))
5333 /* If we've recursively instantiated too many templates, stop. */
5334 if (! push_tinst_level (type))
5337 /* Now we're really doing the instantiation. Mark the type as in
5338 the process of being defined. */
5339 TYPE_BEING_DEFINED (type) = 1;
5341 /* We may be in the middle of deferred access check. Disable
5343 push_deferring_access_checks (dk_no_deferred);
5345 push_to_top_level ();
5349 /* This TYPE is actually an instantiation of a partial
5350 specialization. We replace the innermost set of ARGS with
5351 the arguments appropriate for substitution. For example,
5354 template <class T> struct S {};
5355 template <class T> struct S<T*> {};
5357 and supposing that we are instantiating S<int*>, ARGS will
5358 present be {int*} but we need {int}. */
5360 = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t),
5363 /* If there were multiple levels in ARGS, replacing the
5364 innermost level would alter CLASSTYPE_TI_ARGS, which we don't
5365 want, so we make a copy first. */
5366 if (TMPL_ARGS_HAVE_MULTIPLE_LEVELS (args))
5368 args = copy_node (args);
5369 SET_TMPL_ARGS_LEVEL (args, TMPL_ARGS_DEPTH (args), inner_args);
5375 SET_CLASSTYPE_INTERFACE_UNKNOWN (type);
5377 /* Set the input location to the template definition. This is needed
5378 if tsubsting causes an error. */
5379 input_location = DECL_SOURCE_LOCATION (TYPE_NAME (pattern));
5381 TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern);
5382 TYPE_HAS_DESTRUCTOR (type) = TYPE_HAS_DESTRUCTOR (pattern);
5383 TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern);
5384 TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern);
5385 TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern);
5386 TYPE_HAS_ASSIGN_REF (type) = TYPE_HAS_ASSIGN_REF (pattern);
5387 TYPE_HAS_CONST_ASSIGN_REF (type) = TYPE_HAS_CONST_ASSIGN_REF (pattern);
5388 TYPE_HAS_ABSTRACT_ASSIGN_REF (type) = TYPE_HAS_ABSTRACT_ASSIGN_REF (pattern);
5389 TYPE_HAS_INIT_REF (type) = TYPE_HAS_INIT_REF (pattern);
5390 TYPE_HAS_CONST_INIT_REF (type) = TYPE_HAS_CONST_INIT_REF (pattern);
5391 TYPE_HAS_DEFAULT_CONSTRUCTOR (type) = TYPE_HAS_DEFAULT_CONSTRUCTOR (pattern);
5392 TYPE_HAS_CONVERSION (type) = TYPE_HAS_CONVERSION (pattern);
5393 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (type)
5394 = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (pattern);
5395 TYPE_USES_MULTIPLE_INHERITANCE (type)
5396 = TYPE_USES_MULTIPLE_INHERITANCE (pattern);
5397 TYPE_USES_VIRTUAL_BASECLASSES (type)
5398 = TYPE_USES_VIRTUAL_BASECLASSES (pattern);
5399 TYPE_PACKED (type) = TYPE_PACKED (pattern);
5400 TYPE_ALIGN (type) = TYPE_ALIGN (pattern);
5401 TYPE_USER_ALIGN (type) = TYPE_USER_ALIGN (pattern);
5402 TYPE_FOR_JAVA (type) = TYPE_FOR_JAVA (pattern); /* For libjava's JArray<T> */
5403 if (ANON_AGGR_TYPE_P (pattern))
5404 SET_ANON_AGGR_TYPE_P (type);
5406 pbinfo = TYPE_BINFO (pattern);
5408 #ifdef ENABLE_CHECKING
5409 if (DECL_CLASS_SCOPE_P (TYPE_MAIN_DECL (pattern))
5410 && ! COMPLETE_TYPE_P (TYPE_CONTEXT (type))
5411 && ! TYPE_BEING_DEFINED (TYPE_CONTEXT (type)))
5412 /* We should never instantiate a nested class before its enclosing
5413 class; we need to look up the nested class by name before we can
5414 instantiate it, and that lookup should instantiate the enclosing
5419 base_list = NULL_TREE;
5420 if (BINFO_BASE_BINFOS (pbinfo))
5422 tree pbases = BINFO_BASE_BINFOS (pbinfo);
5423 tree paccesses = BINFO_BASE_ACCESSES (pbinfo);
5424 tree context = TYPE_CONTEXT (type);
5428 /* We must enter the scope containing the type, as that is where
5429 the accessibility of types named in dependent bases are
5431 pop_p = push_scope (context ? context : global_namespace);
5433 /* Substitute into each of the bases to determine the actual
5435 for (i = 0; i < TREE_VEC_LENGTH (pbases); ++i)
5441 pbase = TREE_VEC_ELT (pbases, i);
5442 access = TREE_VEC_ELT (paccesses, i);
5444 /* Substitute to figure out the base class. */
5445 base = tsubst (BINFO_TYPE (pbase), args, tf_error, NULL_TREE);
5446 if (base == error_mark_node)
5449 base_list = tree_cons (access, base, base_list);
5450 if (BINFO_VIRTUAL_P (pbase))
5451 TREE_TYPE (base_list) = integer_type_node;
5454 /* The list is now in reverse order; correct that. */
5455 base_list = nreverse (base_list);
5458 pop_scope (context ? context : global_namespace);
5460 /* Now call xref_basetypes to set up all the base-class
5462 xref_basetypes (type, base_list);
5465 /* Now that our base classes are set up, enter the scope of the
5466 class, so that name lookups into base classes, etc. will work
5467 correctly. This is precisely analogous to what we do in
5468 begin_class_definition when defining an ordinary non-template
5472 /* Now members are processed in the order of declaration. */
5473 for (member = CLASSTYPE_DECL_LIST (pattern);
5474 member; member = TREE_CHAIN (member))
5476 tree t = TREE_VALUE (member);
5478 if (TREE_PURPOSE (member))
5482 /* Build new CLASSTYPE_NESTED_UTDS. */
5485 tree name = TYPE_IDENTIFIER (tag);
5488 newtag = tsubst (tag, args, tf_error, NULL_TREE);
5489 if (newtag == error_mark_node)
5492 if (TREE_CODE (newtag) != ENUMERAL_TYPE)
5494 if (TYPE_LANG_SPECIFIC (tag) && CLASSTYPE_IS_TEMPLATE (tag))
5495 /* Unfortunately, lookup_template_class sets
5496 CLASSTYPE_IMPLICIT_INSTANTIATION for a partial
5497 instantiation (i.e., for the type of a member
5498 template class nested within a template class.)
5499 This behavior is required for
5500 maybe_process_partial_specialization to work
5501 correctly, but is not accurate in this case;
5502 the TAG is not an instantiation of anything.
5503 (The corresponding TEMPLATE_DECL is an
5504 instantiation, but the TYPE is not.) */
5505 CLASSTYPE_USE_TEMPLATE (newtag) = 0;
5507 /* Now, we call pushtag to put this NEWTAG into the scope of
5508 TYPE. We first set up the IDENTIFIER_TYPE_VALUE to avoid
5509 pushtag calling push_template_decl. We don't have to do
5510 this for enums because it will already have been done in
5513 SET_IDENTIFIER_TYPE_VALUE (name, newtag);
5514 pushtag (name, newtag, /*globalize=*/0);
5517 else if (TREE_CODE (t) == FUNCTION_DECL
5518 || DECL_FUNCTION_TEMPLATE_P (t))
5520 /* Build new TYPE_METHODS. */
5523 if (TREE_CODE (t) == TEMPLATE_DECL)
5524 ++processing_template_decl;
5525 r = tsubst (t, args, tf_error, NULL_TREE);
5526 if (TREE_CODE (t) == TEMPLATE_DECL)
5527 --processing_template_decl;
5528 set_current_access_from_decl (r);
5529 grok_special_member_properties (r);
5530 finish_member_declaration (r);
5534 /* Build new TYPE_FIELDS. */
5536 if (TREE_CODE (t) != CONST_DECL)
5540 /* The the file and line for this declaration, to
5541 assist in error message reporting. Since we
5542 called push_tinst_level above, we don't need to
5544 input_location = DECL_SOURCE_LOCATION (t);
5546 if (TREE_CODE (t) == TEMPLATE_DECL)
5547 ++processing_template_decl;
5548 r = tsubst (t, args, tf_error | tf_warning, NULL_TREE);
5549 if (TREE_CODE (t) == TEMPLATE_DECL)
5550 --processing_template_decl;
5551 if (TREE_CODE (r) == VAR_DECL)
5555 if (DECL_INITIALIZED_IN_CLASS_P (r))
5556 init = tsubst_expr (DECL_INITIAL (t), args,
5557 tf_error | tf_warning, NULL_TREE);
5561 finish_static_data_member_decl
5562 (r, init, /*asmspec_tree=*/NULL_TREE, /*flags=*/0);
5564 if (DECL_INITIALIZED_IN_CLASS_P (r))
5565 check_static_variable_definition (r, TREE_TYPE (r));
5567 else if (TREE_CODE (r) == FIELD_DECL)
5569 /* Determine whether R has a valid type and can be
5570 completed later. If R is invalid, then it is
5571 replaced by error_mark_node so that it will not be
5572 added to TYPE_FIELDS. */
5573 tree rtype = TREE_TYPE (r);
5574 if (can_complete_type_without_circularity (rtype))
5575 complete_type (rtype);
5577 if (!COMPLETE_TYPE_P (rtype))
5579 cxx_incomplete_type_error (r, rtype);
5580 r = error_mark_node;
5584 /* If it is a TYPE_DECL for a class-scoped ENUMERAL_TYPE,
5585 such a thing will already have been added to the field
5586 list by tsubst_enum in finish_member_declaration in the
5587 CLASSTYPE_NESTED_UTDS case above. */
5588 if (!(TREE_CODE (r) == TYPE_DECL
5589 && TREE_CODE (TREE_TYPE (r)) == ENUMERAL_TYPE
5590 && DECL_ARTIFICIAL (r)))
5592 set_current_access_from_decl (r);
5593 finish_member_declaration (r);
5600 if (TYPE_P (t) || DECL_CLASS_TEMPLATE_P (t))
5602 /* Build new CLASSTYPE_FRIEND_CLASSES. */
5604 tree friend_type = t;
5605 tree new_friend_type;
5607 if (TREE_CODE (friend_type) == TEMPLATE_DECL)
5608 new_friend_type = tsubst_friend_class (friend_type, args);
5609 else if (uses_template_parms (friend_type))
5610 new_friend_type = tsubst (friend_type, args,
5611 tf_error | tf_warning, NULL_TREE);
5612 else if (CLASSTYPE_USE_TEMPLATE (friend_type))
5613 new_friend_type = friend_type;
5616 tree ns = decl_namespace_context (TYPE_MAIN_DECL (friend_type));
5618 /* The call to xref_tag_from_type does injection for friend
5620 push_nested_namespace (ns);
5622 xref_tag_from_type (friend_type, NULL_TREE, 1);
5623 pop_nested_namespace (ns);
5626 if (TREE_CODE (friend_type) == TEMPLATE_DECL)
5627 /* Trick make_friend_class into realizing that the friend
5628 we're adding is a template, not an ordinary class. It's
5629 important that we use make_friend_class since it will
5630 perform some error-checking and output cross-reference
5632 ++processing_template_decl;
5634 if (new_friend_type != error_mark_node)
5635 make_friend_class (type, new_friend_type,
5636 /*complain=*/false);
5638 if (TREE_CODE (friend_type) == TEMPLATE_DECL)
5639 --processing_template_decl;
5643 /* Build new DECL_FRIENDLIST. */
5646 if (TREE_CODE (t) == TEMPLATE_DECL)
5648 ++processing_template_decl;
5649 push_deferring_access_checks (dk_no_check);
5652 r = tsubst_friend_function (t, args);
5653 add_friend (type, r, /*complain=*/false);
5654 if (TREE_CODE (t) == TEMPLATE_DECL)
5656 pop_deferring_access_checks ();
5657 --processing_template_decl;
5663 /* Set the file and line number information to whatever is given for
5664 the class itself. This puts error messages involving generated
5665 implicit functions at a predictable point, and the same point
5666 that would be used for non-template classes. */
5667 typedecl = TYPE_MAIN_DECL (type);
5668 input_location = DECL_SOURCE_LOCATION (typedecl);
5670 unreverse_member_declarations (type);
5671 finish_struct_1 (type);
5673 /* Clear this now so repo_template_used is happy. */
5674 TYPE_BEING_DEFINED (type) = 0;
5675 repo_template_used (type);
5677 /* Now that the class is complete, instantiate default arguments for
5678 any member functions. We don't do this earlier because the
5679 default arguments may reference members of the class. */
5680 if (!PRIMARY_TEMPLATE_P (template))
5681 for (t = TYPE_METHODS (type); t; t = TREE_CHAIN (t))
5682 if (TREE_CODE (t) == FUNCTION_DECL
5683 /* Implicitly generated member functions will not have template
5684 information; they are not instantiations, but instead are
5685 created "fresh" for each instantiation. */
5686 && DECL_TEMPLATE_INFO (t))
5687 tsubst_default_arguments (t);
5690 pop_from_top_level ();
5691 pop_deferring_access_checks ();
5694 if (TYPE_CONTAINS_VPTR_P (type))
5695 keyed_classes = tree_cons (NULL_TREE, type, keyed_classes);
5701 tsubst_template_arg (tree t, tree args, tsubst_flags_t complain, tree in_decl)
5707 else if (TYPE_P (t))
5708 r = tsubst (t, args, complain, in_decl);
5711 r = tsubst_expr (t, args, complain, in_decl);
5713 if (!uses_template_parms (r))
5715 /* Sometimes, one of the args was an expression involving a
5716 template constant parameter, like N - 1. Now that we've
5717 tsubst'd, we might have something like 2 - 1. This will
5718 confuse lookup_template_class, so we do constant folding
5719 here. We have to unset processing_template_decl, to fool
5720 tsubst_copy_and_build() into building an actual tree. */
5722 /* If the TREE_TYPE of ARG is not NULL_TREE, ARG is already
5723 as simple as it's going to get, and trying to reprocess
5724 the trees will break. Once tsubst_expr et al DTRT for
5725 non-dependent exprs, this code can go away, as the type
5726 will always be set. */
5729 int saved_processing_template_decl = processing_template_decl;
5730 processing_template_decl = 0;
5731 r = tsubst_copy_and_build (r, /*args=*/NULL_TREE,
5732 tf_error, /*in_decl=*/NULL_TREE,
5733 /*function_p=*/false);
5734 processing_template_decl = saved_processing_template_decl;
5742 /* Substitute ARGS into the vector or list of template arguments T. */
5745 tsubst_template_args (tree t, tree args, tsubst_flags_t complain, tree in_decl)
5747 int len = TREE_VEC_LENGTH (t);
5748 int need_new = 0, i;
5749 tree *elts = alloca (len * sizeof (tree));
5751 for (i = 0; i < len; i++)
5753 tree orig_arg = TREE_VEC_ELT (t, i);
5756 if (TREE_CODE (orig_arg) == TREE_VEC)
5757 new_arg = tsubst_template_args (orig_arg, args, complain, in_decl);
5759 new_arg = tsubst_template_arg (orig_arg, args, complain, in_decl);
5761 if (new_arg == error_mark_node)
5762 return error_mark_node;
5765 if (new_arg != orig_arg)
5772 t = make_tree_vec (len);
5773 for (i = 0; i < len; i++)
5774 TREE_VEC_ELT (t, i) = elts[i];
5779 /* Return the result of substituting ARGS into the template parameters
5780 given by PARMS. If there are m levels of ARGS and m + n levels of
5781 PARMS, then the result will contain n levels of PARMS. For
5782 example, if PARMS is `template <class T> template <class U>
5783 template <T*, U, class V>' and ARGS is {{int}, {double}} then the
5784 result will be `template <int*, double, class V>'. */
5787 tsubst_template_parms (tree parms, tree args, tsubst_flags_t complain)
5792 for (new_parms = &r;
5793 TMPL_PARMS_DEPTH (parms) > TMPL_ARGS_DEPTH (args);
5794 new_parms = &(TREE_CHAIN (*new_parms)),
5795 parms = TREE_CHAIN (parms))
5798 make_tree_vec (TREE_VEC_LENGTH (TREE_VALUE (parms)));
5801 for (i = 0; i < TREE_VEC_LENGTH (new_vec); ++i)
5803 tree tuple = TREE_VEC_ELT (TREE_VALUE (parms), i);
5804 tree default_value = TREE_PURPOSE (tuple);
5805 tree parm_decl = TREE_VALUE (tuple);
5807 parm_decl = tsubst (parm_decl, args, complain, NULL_TREE);
5808 default_value = tsubst_template_arg (default_value, args,
5809 complain, NULL_TREE);
5811 tuple = build_tree_list (default_value, parm_decl);
5812 TREE_VEC_ELT (new_vec, i) = tuple;
5816 tree_cons (size_int (TMPL_PARMS_DEPTH (parms)
5817 - TMPL_ARGS_DEPTH (args)),
5818 new_vec, NULL_TREE);
5824 /* Substitute the ARGS into the indicated aggregate (or enumeration)
5825 type T. If T is not an aggregate or enumeration type, it is
5826 handled as if by tsubst. IN_DECL is as for tsubst. If
5827 ENTERING_SCOPE is nonzero, T is the context for a template which
5828 we are presently tsubst'ing. Return the substituted value. */
5831 tsubst_aggr_type (tree t,
5833 tsubst_flags_t complain,
5840 switch (TREE_CODE (t))
5843 if (TYPE_PTRMEMFUNC_P (t))
5844 return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl);
5846 /* Else fall through. */
5849 if (TYPE_TEMPLATE_INFO (t))
5855 /* First, determine the context for the type we are looking
5857 context = TYPE_CONTEXT (t);
5859 context = tsubst_aggr_type (context, args, complain,
5860 in_decl, /*entering_scope=*/1);
5862 /* Then, figure out what arguments are appropriate for the
5863 type we are trying to find. For example, given:
5865 template <class T> struct S;
5866 template <class T, class U> void f(T, U) { S<U> su; }
5868 and supposing that we are instantiating f<int, double>,
5869 then our ARGS will be {int, double}, but, when looking up
5870 S we only want {double}. */
5871 argvec = tsubst_template_args (TYPE_TI_ARGS (t), args,
5873 if (argvec == error_mark_node)
5874 return error_mark_node;
5876 r = lookup_template_class (t, argvec, in_decl, context,
5877 entering_scope, complain);
5879 return cp_build_qualified_type_real (r, TYPE_QUALS (t), complain);
5882 /* This is not a template type, so there's nothing to do. */
5886 return tsubst (t, args, complain, in_decl);
5890 /* Substitute into the default argument ARG (a default argument for
5891 FN), which has the indicated TYPE. */
5894 tsubst_default_argument (tree fn, tree type, tree arg)
5896 /* This default argument came from a template. Instantiate the
5897 default argument here, not in tsubst. In the case of
5906 we must be careful to do name lookup in the scope of S<T>,
5907 rather than in the current class. */
5908 push_access_scope (fn);
5909 /* The default argument expression should not be considered to be
5910 within the scope of FN. Since push_access_scope sets
5911 current_function_decl, we must explicitly clear it here. */
5912 current_function_decl = NULL_TREE;
5914 push_deferring_access_checks(dk_no_deferred);
5915 arg = tsubst_expr (arg, DECL_TI_ARGS (fn),
5916 tf_error | tf_warning, NULL_TREE);
5917 pop_deferring_access_checks();
5919 pop_access_scope (fn);
5921 /* Make sure the default argument is reasonable. */
5922 arg = check_default_argument (type, arg);
5927 /* Substitute into all the default arguments for FN. */
5930 tsubst_default_arguments (tree fn)
5935 tmpl_args = DECL_TI_ARGS (fn);
5937 /* If this function is not yet instantiated, we certainly don't need
5938 its default arguments. */
5939 if (uses_template_parms (tmpl_args))
5942 for (arg = TYPE_ARG_TYPES (TREE_TYPE (fn));
5944 arg = TREE_CHAIN (arg))
5945 if (TREE_PURPOSE (arg))
5946 TREE_PURPOSE (arg) = tsubst_default_argument (fn,
5948 TREE_PURPOSE (arg));
5951 /* Substitute the ARGS into the T, which is a _DECL. TYPE is the
5952 (already computed) substitution of ARGS into TREE_TYPE (T), if
5953 appropriate. Return the result of the substitution. Issue error
5954 and warning messages under control of COMPLAIN. */
5957 tsubst_decl (tree t, tree args, tree type, tsubst_flags_t complain)
5959 location_t saved_loc;
5963 /* Set the filename and linenumber to improve error-reporting. */
5964 saved_loc = input_location;
5965 input_location = DECL_SOURCE_LOCATION (t);
5967 switch (TREE_CODE (t))
5971 /* We can get here when processing a member template function
5972 of a template class. */
5973 tree decl = DECL_TEMPLATE_RESULT (t);
5975 int is_template_template_parm = DECL_TEMPLATE_TEMPLATE_PARM_P (t);
5977 if (!is_template_template_parm)
5979 /* We might already have an instance of this template.
5980 The ARGS are for the surrounding class type, so the
5981 full args contain the tsubst'd args for the context,
5982 plus the innermost args from the template decl. */
5983 tree tmpl_args = DECL_CLASS_TEMPLATE_P (t)
5984 ? CLASSTYPE_TI_ARGS (TREE_TYPE (t))
5985 : DECL_TI_ARGS (DECL_TEMPLATE_RESULT (t));
5988 full_args = tsubst_template_args (tmpl_args, args,
5991 /* tsubst_template_args doesn't copy the vector if
5992 nothing changed. But, *something* should have
5994 my_friendly_assert (full_args != tmpl_args, 0);
5996 spec = retrieve_specialization (t, full_args);
5997 if (spec != NULL_TREE)
6004 /* Make a new template decl. It will be similar to the
6005 original, but will record the current template arguments.
6006 We also create a new function declaration, which is just
6007 like the old one, but points to this new template, rather
6008 than the old one. */
6010 my_friendly_assert (DECL_LANG_SPECIFIC (r) != 0, 0);
6011 TREE_CHAIN (r) = NULL_TREE;
6013 if (is_template_template_parm)
6015 tree new_decl = tsubst (decl, args, complain, in_decl);
6016 DECL_TEMPLATE_RESULT (r) = new_decl;
6017 TREE_TYPE (r) = TREE_TYPE (new_decl);
6022 = tsubst_aggr_type (DECL_CONTEXT (t), args,
6024 /*entering_scope=*/1);
6025 DECL_TEMPLATE_INFO (r) = build_tree_list (t, args);
6027 if (TREE_CODE (decl) == TYPE_DECL)
6029 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6030 if (new_type == error_mark_node)
6031 return error_mark_node;
6033 TREE_TYPE (r) = new_type;
6034 CLASSTYPE_TI_TEMPLATE (new_type) = r;
6035 DECL_TEMPLATE_RESULT (r) = TYPE_MAIN_DECL (new_type);
6036 DECL_TI_ARGS (r) = CLASSTYPE_TI_ARGS (new_type);
6040 tree new_decl = tsubst (decl, args, complain, in_decl);
6041 if (new_decl == error_mark_node)
6042 return error_mark_node;
6044 DECL_TEMPLATE_RESULT (r) = new_decl;
6045 DECL_TI_TEMPLATE (new_decl) = r;
6046 TREE_TYPE (r) = TREE_TYPE (new_decl);
6047 DECL_TI_ARGS (r) = DECL_TI_ARGS (new_decl);
6050 SET_DECL_IMPLICIT_INSTANTIATION (r);
6051 DECL_TEMPLATE_INSTANTIATIONS (r) = NULL_TREE;
6052 DECL_TEMPLATE_SPECIALIZATIONS (r) = NULL_TREE;
6054 /* The template parameters for this new template are all the
6055 template parameters for the old template, except the
6056 outermost level of parameters. */
6057 DECL_TEMPLATE_PARMS (r)
6058 = tsubst_template_parms (DECL_TEMPLATE_PARMS (t), args,
6061 if (PRIMARY_TEMPLATE_P (t))
6062 DECL_PRIMARY_TEMPLATE (r) = r;
6064 if (TREE_CODE (decl) != TYPE_DECL)
6065 /* Record this non-type partial instantiation. */
6066 register_specialization (r, t,
6067 DECL_TI_ARGS (DECL_TEMPLATE_RESULT (r)));
6074 tree argvec = NULL_TREE;
6081 /* Nobody should be tsubst'ing into non-template functions. */
6082 my_friendly_assert (DECL_TEMPLATE_INFO (t) != NULL_TREE, 0);
6084 if (TREE_CODE (DECL_TI_TEMPLATE (t)) == TEMPLATE_DECL)
6089 /* If T is not dependent, just return it. We have to
6090 increment PROCESSING_TEMPLATE_DECL because
6091 value_dependent_expression_p assumes that nothing is
6092 dependent when PROCESSING_TEMPLATE_DECL is zero. */
6093 ++processing_template_decl;
6094 dependent_p = value_dependent_expression_p (t);
6095 --processing_template_decl;
6099 /* Calculate the most general template of which R is a
6100 specialization, and the complete set of arguments used to
6102 gen_tmpl = most_general_template (DECL_TI_TEMPLATE (t));
6103 argvec = tsubst_template_args (DECL_TI_ARGS
6104 (DECL_TEMPLATE_RESULT (gen_tmpl)),
6105 args, complain, in_decl);
6107 /* Check to see if we already have this specialization. */
6108 spec = retrieve_specialization (gen_tmpl, argvec);
6116 /* We can see more levels of arguments than parameters if
6117 there was a specialization of a member template, like
6120 template <class T> struct S { template <class U> void f(); }
6121 template <> template <class U> void S<int>::f(U);
6123 Here, we'll be substituting into the specialization,
6124 because that's where we can find the code we actually
6125 want to generate, but we'll have enough arguments for
6126 the most general template.
6128 We also deal with the peculiar case:
6130 template <class T> struct S {
6131 template <class U> friend void f();
6133 template <class U> void f() {}
6135 template void f<double>();
6137 Here, the ARGS for the instantiation of will be {int,
6138 double}. But, we only need as many ARGS as there are
6139 levels of template parameters in CODE_PATTERN. We are
6140 careful not to get fooled into reducing the ARGS in
6143 template <class T> struct S { template <class U> void f(U); }
6144 template <class T> template <> void S<T>::f(int) {}
6146 which we can spot because the pattern will be a
6147 specialization in this case. */
6148 args_depth = TMPL_ARGS_DEPTH (args);
6150 TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (DECL_TI_TEMPLATE (t)));
6151 if (args_depth > parms_depth
6152 && !DECL_TEMPLATE_SPECIALIZATION (t))
6153 args = get_innermost_template_args (args, parms_depth);
6157 /* This special case arises when we have something like this:
6159 template <class T> struct S {
6160 friend void f<int>(int, double);
6163 Here, the DECL_TI_TEMPLATE for the friend declaration
6164 will be an IDENTIFIER_NODE. We are being called from
6165 tsubst_friend_function, and we want only to create a
6166 new decl (R) with appropriate types so that we can call
6167 determine_specialization. */
6168 gen_tmpl = NULL_TREE;
6171 if (DECL_CLASS_SCOPE_P (t))
6173 if (DECL_NAME (t) == constructor_name (DECL_CONTEXT (t)))
6177 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args,
6178 complain, t, /*entering_scope=*/1);
6183 ctx = DECL_CONTEXT (t);
6185 type = tsubst (type, args, complain, in_decl);
6186 if (type == error_mark_node)
6187 return error_mark_node;
6189 /* We do NOT check for matching decls pushed separately at this
6190 point, as they may not represent instantiations of this
6191 template, and in any case are considered separate under the
6194 DECL_USE_TEMPLATE (r) = 0;
6195 TREE_TYPE (r) = type;
6196 /* Clear out the mangled name and RTL for the instantiation. */
6197 SET_DECL_ASSEMBLER_NAME (r, NULL_TREE);
6198 SET_DECL_RTL (r, NULL_RTX);
6199 DECL_INITIAL (r) = NULL_TREE;
6200 DECL_CONTEXT (r) = ctx;
6202 if (member && DECL_CONV_FN_P (r))
6203 /* Type-conversion operator. Reconstruct the name, in
6204 case it's the name of one of the template's parameters. */
6205 DECL_NAME (r) = mangle_conv_op_name_for_type (TREE_TYPE (type));
6207 DECL_ARGUMENTS (r) = tsubst (DECL_ARGUMENTS (t), args,
6209 DECL_RESULT (r) = NULL_TREE;
6211 TREE_STATIC (r) = 0;
6212 TREE_PUBLIC (r) = TREE_PUBLIC (t);
6213 DECL_EXTERNAL (r) = 1;
6214 DECL_INTERFACE_KNOWN (r) = 0;
6215 DECL_DEFER_OUTPUT (r) = 0;
6216 TREE_CHAIN (r) = NULL_TREE;
6217 DECL_PENDING_INLINE_INFO (r) = 0;
6218 DECL_PENDING_INLINE_P (r) = 0;
6219 DECL_SAVED_TREE (r) = NULL_TREE;
6221 if (DECL_CLONED_FUNCTION (r))
6223 DECL_CLONED_FUNCTION (r) = tsubst (DECL_CLONED_FUNCTION (t),
6225 TREE_CHAIN (r) = TREE_CHAIN (DECL_CLONED_FUNCTION (r));
6226 TREE_CHAIN (DECL_CLONED_FUNCTION (r)) = r;
6229 /* Set up the DECL_TEMPLATE_INFO for R. There's no need to do
6230 this in the special friend case mentioned above where
6231 GEN_TMPL is NULL. */
6234 DECL_TEMPLATE_INFO (r)
6235 = tree_cons (gen_tmpl, argvec, NULL_TREE);
6236 SET_DECL_IMPLICIT_INSTANTIATION (r);
6237 register_specialization (r, gen_tmpl, argvec);
6239 /* We're not supposed to instantiate default arguments
6240 until they are called, for a template. But, for a
6243 template <class T> void f ()
6244 { extern void g(int i = T()); }
6246 we should do the substitution when the template is
6247 instantiated. We handle the member function case in
6248 instantiate_class_template since the default arguments
6249 might refer to other members of the class. */
6251 && !PRIMARY_TEMPLATE_P (gen_tmpl)
6252 && !uses_template_parms (argvec))
6253 tsubst_default_arguments (r);
6256 /* Copy the list of befriending classes. */
6257 for (friends = &DECL_BEFRIENDING_CLASSES (r);
6259 friends = &TREE_CHAIN (*friends))
6261 *friends = copy_node (*friends);
6262 TREE_VALUE (*friends) = tsubst (TREE_VALUE (*friends),
6267 if (DECL_CONSTRUCTOR_P (r) || DECL_DESTRUCTOR_P (r))
6269 maybe_retrofit_in_chrg (r);
6270 if (DECL_CONSTRUCTOR_P (r))
6271 grok_ctor_properties (ctx, r);
6272 /* If this is an instantiation of a member template, clone it.
6273 If it isn't, that'll be handled by
6274 clone_constructors_and_destructors. */
6275 if (PRIMARY_TEMPLATE_P (gen_tmpl))
6276 clone_function_decl (r, /*update_method_vec_p=*/0);
6278 else if (IDENTIFIER_OPNAME_P (DECL_NAME (r)))
6279 grok_op_properties (r, DECL_FRIEND_P (r),
6280 (complain & tf_error) != 0);
6282 if (DECL_FRIEND_P (t) && DECL_FRIEND_CONTEXT (t))
6283 SET_DECL_FRIEND_CONTEXT (r,
6284 tsubst (DECL_FRIEND_CONTEXT (t),
6285 args, complain, in_decl));
6292 if (DECL_TEMPLATE_PARM_P (t))
6293 SET_DECL_TEMPLATE_PARM_P (r);
6295 TREE_TYPE (r) = type;
6296 c_apply_type_quals_to_decl (cp_type_quals (type), r);
6298 if (DECL_INITIAL (r))
6300 if (TREE_CODE (DECL_INITIAL (r)) != TEMPLATE_PARM_INDEX)
6301 DECL_INITIAL (r) = TREE_TYPE (r);
6303 DECL_INITIAL (r) = tsubst (DECL_INITIAL (r), args,
6307 DECL_CONTEXT (r) = NULL_TREE;
6309 if (!DECL_TEMPLATE_PARM_P (r))
6310 DECL_ARG_TYPE (r) = type_passed_as (type);
6312 TREE_CHAIN (r) = tsubst (TREE_CHAIN (t), args,
6313 complain, TREE_CHAIN (t));
6320 TREE_TYPE (r) = type;
6321 c_apply_type_quals_to_decl (cp_type_quals (type), r);
6323 /* We don't have to set DECL_CONTEXT here; it is set by
6324 finish_member_declaration. */
6325 DECL_INITIAL (r) = tsubst_expr (DECL_INITIAL (t), args,
6327 TREE_CHAIN (r) = NULL_TREE;
6328 if (VOID_TYPE_P (type))
6329 cp_error_at ("instantiation of `%D' as type `%T'", r, type);
6336 /* It is not a dependent using decl any more. */
6337 TREE_TYPE (r) = void_type_node;
6339 = tsubst_copy (DECL_INITIAL (t), args, complain, in_decl);
6341 = tsubst_copy (DECL_NAME (t), args, complain, in_decl);
6342 TREE_CHAIN (r) = NULL_TREE;
6347 if (TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM
6348 || t == TYPE_MAIN_DECL (TREE_TYPE (t)))
6350 /* If this is the canonical decl, we don't have to mess with
6351 instantiations, and often we can't (for typename, template
6352 type parms and such). Note that TYPE_NAME is not correct for
6353 the above test if we've copied the type for a typedef. */
6354 r = TYPE_NAME (type);
6362 tree argvec = NULL_TREE;
6363 tree gen_tmpl = NULL_TREE;
6365 tree tmpl = NULL_TREE;
6369 /* Assume this is a non-local variable. */
6372 if (TYPE_P (CP_DECL_CONTEXT (t)))
6373 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args,
6375 in_decl, /*entering_scope=*/1);
6376 else if (DECL_NAMESPACE_SCOPE_P (t))
6377 ctx = DECL_CONTEXT (t);
6380 /* Subsequent calls to pushdecl will fill this in. */
6385 /* Check to see if we already have this specialization. */
6388 tmpl = DECL_TI_TEMPLATE (t);
6389 gen_tmpl = most_general_template (tmpl);
6390 argvec = tsubst (DECL_TI_ARGS (t), args, complain, in_decl);
6391 spec = retrieve_specialization (gen_tmpl, argvec);
6394 spec = retrieve_local_specialization (t);
6403 if (TREE_CODE (r) == VAR_DECL)
6405 type = complete_type (type);
6406 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (r)
6407 = DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (t);
6409 else if (DECL_SELF_REFERENCE_P (t))
6410 SET_DECL_SELF_REFERENCE_P (r);
6411 TREE_TYPE (r) = type;
6412 c_apply_type_quals_to_decl (cp_type_quals (type), r);
6413 DECL_CONTEXT (r) = ctx;
6414 /* Clear out the mangled name and RTL for the instantiation. */
6415 SET_DECL_ASSEMBLER_NAME (r, NULL_TREE);
6416 SET_DECL_RTL (r, NULL_RTX);
6418 /* Don't try to expand the initializer until someone tries to use
6419 this variable; otherwise we run into circular dependencies. */
6420 DECL_INITIAL (r) = NULL_TREE;
6421 SET_DECL_RTL (r, NULL_RTX);
6422 DECL_SIZE (r) = DECL_SIZE_UNIT (r) = 0;
6424 /* Even if the original location is out of scope, the newly
6425 substituted one is not. */
6426 if (TREE_CODE (r) == VAR_DECL)
6428 DECL_DEAD_FOR_LOCAL (r) = 0;
6429 DECL_INITIALIZED_P (r) = 0;
6434 /* A static data member declaration is always marked
6435 external when it is declared in-class, even if an
6436 initializer is present. We mimic the non-template
6438 DECL_EXTERNAL (r) = 1;
6440 register_specialization (r, gen_tmpl, argvec);
6441 DECL_TEMPLATE_INFO (r) = tree_cons (tmpl, argvec, NULL_TREE);
6442 SET_DECL_IMPLICIT_INSTANTIATION (r);
6445 register_local_specialization (r, t);
6447 TREE_CHAIN (r) = NULL_TREE;
6448 if (TREE_CODE (r) == VAR_DECL && VOID_TYPE_P (type))
6449 cp_error_at ("instantiation of `%D' as type `%T'", r, type);
6450 /* Compute the size, alignment, etc. of R. */
6459 /* Restore the file and line information. */
6460 input_location = saved_loc;
6465 /* Substitute into the ARG_TYPES of a function type. */
6468 tsubst_arg_types (tree arg_types,
6470 tsubst_flags_t complain,
6473 tree remaining_arg_types;
6476 if (!arg_types || arg_types == void_list_node)
6479 remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types),
6480 args, complain, in_decl);
6481 if (remaining_arg_types == error_mark_node)
6482 return error_mark_node;
6484 type = tsubst (TREE_VALUE (arg_types), args, complain, in_decl);
6485 if (type == error_mark_node)
6486 return error_mark_node;
6487 if (VOID_TYPE_P (type))
6489 if (complain & tf_error)
6491 error ("invalid parameter type `%T'", type);
6493 cp_error_at ("in declaration `%D'", in_decl);
6495 return error_mark_node;
6498 /* Do array-to-pointer, function-to-pointer conversion, and ignore
6499 top-level qualifiers as required. */
6500 type = TYPE_MAIN_VARIANT (type_decays_to (type));
6502 /* Note that we do not substitute into default arguments here. The
6503 standard mandates that they be instantiated only when needed,
6504 which is done in build_over_call. */
6505 return hash_tree_cons (TREE_PURPOSE (arg_types), type,
6506 remaining_arg_types);
6510 /* Substitute into a FUNCTION_TYPE or METHOD_TYPE. This routine does
6511 *not* handle the exception-specification for FNTYPE, because the
6512 initial substitution of explicitly provided template parameters
6513 during argument deduction forbids substitution into the
6514 exception-specification:
6518 All references in the function type of the function template to the
6519 corresponding template parameters are replaced by the specified tem-
6520 plate argument values. If a substitution in a template parameter or
6521 in the function type of the function template results in an invalid
6522 type, type deduction fails. [Note: The equivalent substitution in
6523 exception specifications is done only when the function is instanti-
6524 ated, at which point a program is ill-formed if the substitution
6525 results in an invalid type.] */
6528 tsubst_function_type (tree t,
6530 tsubst_flags_t complain,
6537 /* The TYPE_CONTEXT is not used for function/method types. */
6538 my_friendly_assert (TYPE_CONTEXT (t) == NULL_TREE, 0);
6540 /* Substitute the return type. */
6541 return_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
6542 if (return_type == error_mark_node)
6543 return error_mark_node;
6545 /* Substitute the argument types. */
6546 arg_types = tsubst_arg_types (TYPE_ARG_TYPES (t), args,
6548 if (arg_types == error_mark_node)
6549 return error_mark_node;
6551 /* Construct a new type node and return it. */
6552 if (TREE_CODE (t) == FUNCTION_TYPE)
6553 fntype = build_function_type (return_type, arg_types);
6556 tree r = TREE_TYPE (TREE_VALUE (arg_types));
6557 if (! IS_AGGR_TYPE (r))
6561 Type deduction may fail for any of the following
6564 -- Attempting to create "pointer to member of T" when T
6565 is not a class type. */
6566 if (complain & tf_error)
6567 error ("creating pointer to member function of non-class type `%T'",
6569 return error_mark_node;
6572 fntype = build_method_type_directly (r, return_type,
6573 TREE_CHAIN (arg_types));
6575 fntype = cp_build_qualified_type_real (fntype, TYPE_QUALS (t), complain);
6576 fntype = cp_build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (t));
6581 /* Substitute into the PARMS of a call-declarator. */
6584 tsubst_call_declarator_parms (tree parms,
6586 tsubst_flags_t complain,
6593 if (!parms || parms == void_list_node)
6596 new_parms = tsubst_call_declarator_parms (TREE_CHAIN (parms),
6597 args, complain, in_decl);
6599 /* Figure out the type of this parameter. */
6600 type = tsubst (TREE_VALUE (parms), args, complain, in_decl);
6602 /* Figure out the default argument as well. Note that we use
6603 tsubst_expr since the default argument is really an expression. */
6604 defarg = tsubst_expr (TREE_PURPOSE (parms), args, complain, in_decl);
6606 /* Chain this parameter on to the front of those we have already
6607 processed. We don't use hash_tree_cons because that function
6608 doesn't check TREE_PARMLIST. */
6609 new_parms = tree_cons (defarg, type, new_parms);
6614 /* Take the tree structure T and replace template parameters used
6615 therein with the argument vector ARGS. IN_DECL is an associated
6616 decl for diagnostics. If an error occurs, returns ERROR_MARK_NODE.
6617 Issue error and warning messages under control of COMPLAIN. Note
6618 that we must be relatively non-tolerant of extensions here, in
6619 order to preserve conformance; if we allow substitutions that
6620 should not be allowed, we may allow argument deductions that should
6621 not succeed, and therefore report ambiguous overload situations
6622 where there are none. In theory, we could allow the substitution,
6623 but indicate that it should have failed, and allow our caller to
6624 make sure that the right thing happens, but we don't try to do this
6627 This function is used for dealing with types, decls and the like;
6628 for expressions, use tsubst_expr or tsubst_copy. */
6631 tsubst (tree t, tree args, tsubst_flags_t complain, tree in_decl)
6635 if (t == NULL_TREE || t == error_mark_node
6636 || t == integer_type_node
6637 || t == void_type_node
6638 || t == char_type_node
6639 || TREE_CODE (t) == NAMESPACE_DECL)
6642 if (TREE_CODE (t) == IDENTIFIER_NODE)
6643 type = IDENTIFIER_TYPE_VALUE (t);
6645 type = TREE_TYPE (t);
6647 my_friendly_assert (type != unknown_type_node, 20030716);
6649 if (type && TREE_CODE (t) != FUNCTION_DECL
6650 && TREE_CODE (t) != TYPENAME_TYPE
6651 && TREE_CODE (t) != TEMPLATE_DECL
6652 && TREE_CODE (t) != IDENTIFIER_NODE
6653 && TREE_CODE (t) != FUNCTION_TYPE
6654 && TREE_CODE (t) != METHOD_TYPE)
6655 type = tsubst (type, args, complain, in_decl);
6656 if (type == error_mark_node)
6657 return error_mark_node;
6660 return tsubst_decl (t, args, type, complain);
6662 switch (TREE_CODE (t))
6667 return tsubst_aggr_type (t, args, complain, in_decl,
6668 /*entering_scope=*/0);
6671 case IDENTIFIER_NODE:
6683 if (t == integer_type_node)
6686 if (TREE_CODE (TYPE_MIN_VALUE (t)) == INTEGER_CST
6687 && TREE_CODE (TYPE_MAX_VALUE (t)) == INTEGER_CST)
6691 tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0);
6693 /* The array dimension behaves like a non-type template arg,
6694 in that we want to fold it as much as possible. */
6695 max = tsubst_template_arg (omax, args, complain, in_decl);
6696 if (!processing_template_decl)
6697 max = decl_constant_value (max);
6699 if (integer_zerop (omax))
6701 /* Still allow an explicit array of size zero. */
6703 pedwarn ("creating array with size zero");
6705 else if (integer_zerop (max)
6706 || (TREE_CODE (max) == INTEGER_CST
6707 && INT_CST_LT (max, integer_zero_node)))
6711 Type deduction may fail for any of the following
6714 Attempting to create an array with a size that is
6715 zero or negative. */
6716 if (complain & tf_error)
6717 error ("creating array with size zero (`%E')", max);
6719 return error_mark_node;
6722 return compute_array_index_type (NULL_TREE, max);
6725 case TEMPLATE_TYPE_PARM:
6726 case TEMPLATE_TEMPLATE_PARM:
6727 case BOUND_TEMPLATE_TEMPLATE_PARM:
6728 case TEMPLATE_PARM_INDEX:
6736 if (TREE_CODE (t) == TEMPLATE_TYPE_PARM
6737 || TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM
6738 || TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
6740 idx = TEMPLATE_TYPE_IDX (t);
6741 level = TEMPLATE_TYPE_LEVEL (t);
6745 idx = TEMPLATE_PARM_IDX (t);
6746 level = TEMPLATE_PARM_LEVEL (t);
6749 if (TREE_VEC_LENGTH (args) > 0)
6751 tree arg = NULL_TREE;
6753 levels = TMPL_ARGS_DEPTH (args);
6754 if (level <= levels)
6755 arg = TMPL_ARG (args, level, idx);
6757 if (arg == error_mark_node)
6758 return error_mark_node;
6759 else if (arg != NULL_TREE)
6761 if (TREE_CODE (t) == TEMPLATE_TYPE_PARM)
6763 my_friendly_assert (TYPE_P (arg), 0);
6764 return cp_build_qualified_type_real
6765 (arg, cp_type_quals (arg) | cp_type_quals (t),
6766 complain | tf_ignore_bad_quals);
6768 else if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
6770 /* We are processing a type constructed from
6771 a template template parameter. */
6772 tree argvec = tsubst (TYPE_TI_ARGS (t),
6773 args, complain, in_decl);
6774 if (argvec == error_mark_node)
6775 return error_mark_node;
6777 /* We can get a TEMPLATE_TEMPLATE_PARM here when
6778 we are resolving nested-types in the signature of
6779 a member function templates.
6780 Otherwise ARG is a TEMPLATE_DECL and is the real
6781 template to be instantiated. */
6782 if (TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM)
6783 arg = TYPE_NAME (arg);
6785 r = lookup_template_class (arg,
6788 /*entering_scope=*/0,
6790 return cp_build_qualified_type_real
6791 (r, TYPE_QUALS (t), complain);
6794 /* TEMPLATE_TEMPLATE_PARM or TEMPLATE_PARM_INDEX. */
6802 /* This can happen during the attempted tsubst'ing in
6803 unify. This means that we don't yet have any information
6804 about the template parameter in question. */
6807 /* If we get here, we must have been looking at a parm for a
6808 more deeply nested template. Make a new version of this
6809 template parameter, but with a lower level. */
6810 switch (TREE_CODE (t))
6812 case TEMPLATE_TYPE_PARM:
6813 case TEMPLATE_TEMPLATE_PARM:
6814 case BOUND_TEMPLATE_TEMPLATE_PARM:
6815 if (cp_type_quals (t))
6817 r = tsubst (TYPE_MAIN_VARIANT (t), args, complain, in_decl);
6818 r = cp_build_qualified_type_real
6819 (r, cp_type_quals (t),
6820 complain | (TREE_CODE (t) == TEMPLATE_TYPE_PARM
6821 ? tf_ignore_bad_quals : 0));
6826 TEMPLATE_TYPE_PARM_INDEX (r)
6827 = reduce_template_parm_level (TEMPLATE_TYPE_PARM_INDEX (t),
6829 TYPE_STUB_DECL (r) = TYPE_NAME (r) = TEMPLATE_TYPE_DECL (r);
6830 TYPE_MAIN_VARIANT (r) = r;
6831 TYPE_POINTER_TO (r) = NULL_TREE;
6832 TYPE_REFERENCE_TO (r) = NULL_TREE;
6834 if (TREE_CODE (t) == BOUND_TEMPLATE_TEMPLATE_PARM)
6836 tree argvec = tsubst (TYPE_TI_ARGS (t), args,
6838 if (argvec == error_mark_node)
6839 return error_mark_node;
6841 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (r)
6842 = tree_cons (TYPE_TI_TEMPLATE (t), argvec, NULL_TREE);
6847 case TEMPLATE_PARM_INDEX:
6848 r = reduce_template_parm_level (t, type, levels);
6860 tree purpose, value, chain;
6862 if (t == void_list_node)
6865 purpose = TREE_PURPOSE (t);
6868 purpose = tsubst (purpose, args, complain, in_decl);
6869 if (purpose == error_mark_node)
6870 return error_mark_node;
6872 value = TREE_VALUE (t);
6875 value = tsubst (value, args, complain, in_decl);
6876 if (value == error_mark_node)
6877 return error_mark_node;
6879 chain = TREE_CHAIN (t);
6880 if (chain && chain != void_type_node)
6882 chain = tsubst (chain, args, complain, in_decl);
6883 if (chain == error_mark_node)
6884 return error_mark_node;
6886 if (purpose == TREE_PURPOSE (t)
6887 && value == TREE_VALUE (t)
6888 && chain == TREE_CHAIN (t))
6890 return hash_tree_cons (purpose, value, chain);
6894 /* A binfo node. We always need to make a copy, of the node
6895 itself and of its BINFO_BASE_BINFOS. */
6896 my_friendly_assert (type, 20040628);
6900 /* Make sure type isn't a typedef copy. */
6901 type = BINFO_TYPE (TYPE_BINFO (type));
6903 TREE_TYPE (t) = complete_type (type);
6904 if (IS_AGGR_TYPE (type))
6906 BINFO_VTABLE (t) = BINFO_VTABLE (TYPE_BINFO (type));
6907 BINFO_VIRTUALS (t) = BINFO_VIRTUALS (TYPE_BINFO (type));
6908 if (BINFO_BASE_BINFOS (TYPE_BINFO (type)) != NULL_TREE)
6909 BINFO_BASE_BINFOS (t)
6910 = copy_node (BINFO_BASE_BINFOS (TYPE_BINFO (type)));
6915 /* A vector of template arguments. */
6916 my_friendly_assert (!type, 20040628);
6917 return tsubst_template_args (t, args, complain, in_decl);
6920 case REFERENCE_TYPE:
6922 enum tree_code code;
6924 if (type == TREE_TYPE (t) && TREE_CODE (type) != METHOD_TYPE)
6927 code = TREE_CODE (t);
6932 Type deduction may fail for any of the following
6935 -- Attempting to create a pointer to reference type.
6936 -- Attempting to create a reference to a reference type or
6937 a reference to void. */
6938 if (TREE_CODE (type) == REFERENCE_TYPE
6939 || (code == REFERENCE_TYPE && TREE_CODE (type) == VOID_TYPE))
6941 static location_t last_loc;
6943 /* We keep track of the last time we issued this error
6944 message to avoid spewing a ton of messages during a
6945 single bad template instantiation. */
6946 if (complain & tf_error
6947 #ifdef USE_MAPPED_LOCATION
6948 && last_loc != input_location)
6950 && (last_loc.line != input_line
6951 || last_loc.file != input_filename))
6954 if (TREE_CODE (type) == VOID_TYPE)
6955 error ("forming reference to void");
6957 error ("forming %s to reference type `%T'",
6958 (code == POINTER_TYPE) ? "pointer" : "reference",
6960 last_loc = input_location;
6963 return error_mark_node;
6965 else if (code == POINTER_TYPE)
6967 r = build_pointer_type (type);
6968 if (TREE_CODE (type) == METHOD_TYPE)
6969 r = build_ptrmemfunc_type (r);
6972 r = build_reference_type (type);
6973 r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain);
6975 if (r != error_mark_node)
6976 /* Will this ever be needed for TYPE_..._TO values? */
6983 r = tsubst (TYPE_OFFSET_BASETYPE (t), args, complain, in_decl);
6984 if (r == error_mark_node || !IS_AGGR_TYPE (r))
6988 Type deduction may fail for any of the following
6991 -- Attempting to create "pointer to member of T" when T
6992 is not a class type. */
6993 if (complain & tf_error)
6994 error ("creating pointer to member of non-class type `%T'", r);
6995 return error_mark_node;
6997 if (TREE_CODE (type) == REFERENCE_TYPE)
6999 if (complain & tf_error)
7000 error ("creating pointer to member reference type `%T'", type);
7002 return error_mark_node;
7004 my_friendly_assert (TREE_CODE (type) != METHOD_TYPE, 20011231);
7005 if (TREE_CODE (type) == FUNCTION_TYPE)
7007 /* This is really a method type. The cv qualifiers of the
7008 this pointer should _not_ be determined by the cv
7009 qualifiers of the class type. They should be held
7010 somewhere in the FUNCTION_TYPE, but we don't do that at
7011 the moment. Consider
7012 typedef void (Func) () const;
7014 template <typename T1> void Foo (Func T1::*);
7019 method_type = build_method_type_directly (TYPE_MAIN_VARIANT (r),
7021 TYPE_ARG_TYPES (type));
7022 return build_ptrmemfunc_type (build_pointer_type (method_type));
7025 return cp_build_qualified_type_real (build_ptrmem_type (r, type),
7035 fntype = tsubst_function_type (t, args, complain, in_decl);
7036 if (fntype == error_mark_node)
7037 return error_mark_node;
7039 /* Substitute the exception specification. */
7040 raises = TYPE_RAISES_EXCEPTIONS (t);
7043 tree list = NULL_TREE;
7045 if (! TREE_VALUE (raises))
7048 for (; raises != NULL_TREE; raises = TREE_CHAIN (raises))
7050 tree spec = TREE_VALUE (raises);
7052 spec = tsubst (spec, args, complain, in_decl);
7053 if (spec == error_mark_node)
7055 list = add_exception_specifier (list, spec, complain);
7057 fntype = build_exception_variant (fntype, list);
7063 tree domain = tsubst (TYPE_DOMAIN (t), args, complain, in_decl);
7064 if (domain == error_mark_node)
7065 return error_mark_node;
7067 /* As an optimization, we avoid regenerating the array type if
7068 it will obviously be the same as T. */
7069 if (type == TREE_TYPE (t) && domain == TYPE_DOMAIN (t))
7072 /* These checks should match the ones in grokdeclarator.
7076 The deduction may fail for any of the following reasons:
7078 -- Attempting to create an array with an element type that
7079 is void, a function type, or a reference type, or [DR337]
7080 an abstract class type. */
7081 if (TREE_CODE (type) == VOID_TYPE
7082 || TREE_CODE (type) == FUNCTION_TYPE
7083 || TREE_CODE (type) == REFERENCE_TYPE)
7085 if (complain & tf_error)
7086 error ("creating array of `%T'", type);
7087 return error_mark_node;
7089 if (CLASS_TYPE_P (type) && CLASSTYPE_PURE_VIRTUALS (type))
7091 if (complain & tf_error)
7092 error ("creating array of `%T', which is an abstract class type",
7094 return error_mark_node;
7097 r = build_cplus_array_type (type, domain);
7104 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7105 tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl);
7107 if (e1 == error_mark_node || e2 == error_mark_node)
7108 return error_mark_node;
7110 return fold (build (TREE_CODE (t), TREE_TYPE (t), e1, e2));
7116 tree e = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7117 if (e == error_mark_node)
7118 return error_mark_node;
7120 return fold (build (TREE_CODE (t), TREE_TYPE (t), e));
7125 tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain,
7126 in_decl, /*entering_scope=*/1);
7127 tree f = tsubst_copy (TYPENAME_TYPE_FULLNAME (t), args,
7130 if (ctx == error_mark_node || f == error_mark_node)
7131 return error_mark_node;
7133 if (!IS_AGGR_TYPE (ctx))
7135 if (complain & tf_error)
7136 error ("`%T' is not a class, struct, or union type",
7138 return error_mark_node;
7140 else if (!uses_template_parms (ctx) && !TYPE_BEING_DEFINED (ctx))
7142 /* Normally, make_typename_type does not require that the CTX
7143 have complete type in order to allow things like:
7145 template <class T> struct S { typename S<T>::X Y; };
7147 But, such constructs have already been resolved by this
7148 point, so here CTX really should have complete type, unless
7149 it's a partial instantiation. */
7150 ctx = complete_type (ctx);
7151 if (!COMPLETE_TYPE_P (ctx))
7153 if (complain & tf_error)
7154 cxx_incomplete_type_error (NULL_TREE, ctx);
7155 return error_mark_node;
7159 f = make_typename_type (ctx, f,
7160 (complain & tf_error) | tf_keep_type_decl);
7161 if (f == error_mark_node)
7163 if (TREE_CODE (f) == TYPE_DECL)
7165 complain |= tf_ignore_bad_quals;
7169 return cp_build_qualified_type_real
7170 (f, cp_type_quals (f) | cp_type_quals (t), complain);
7173 case UNBOUND_CLASS_TEMPLATE:
7175 tree ctx = tsubst_aggr_type (TYPE_CONTEXT (t), args, complain,
7176 in_decl, /*entering_scope=*/1);
7177 tree name = TYPE_IDENTIFIER (t);
7179 if (ctx == error_mark_node || name == error_mark_node)
7180 return error_mark_node;
7182 return make_unbound_class_template (ctx, name, complain);
7192 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7193 tree e2 = tsubst_expr (TREE_OPERAND (t, 1), args, complain, in_decl);
7194 if (e1 == error_mark_node || e2 == error_mark_node)
7195 return error_mark_node;
7197 return build_nt (ARRAY_REF, e1, e2, NULL_TREE, NULL_TREE);
7202 tree e1 = tsubst (TREE_OPERAND (t, 0), args, complain, in_decl);
7203 tree e2 = tsubst (TREE_OPERAND (t, 1), args, complain, in_decl);
7204 if (e1 == error_mark_node || e2 == error_mark_node)
7205 return error_mark_node;
7207 return build_nt (TREE_CODE (t), e1, e2);
7214 type = finish_typeof (tsubst_expr (TYPEOF_TYPE_EXPR (t), args,
7215 complain, in_decl));
7216 return cp_build_qualified_type_real (type,
7218 | cp_type_quals (type),
7223 sorry ("use of `%s' in template",
7224 tree_code_name [(int) TREE_CODE (t)]);
7225 return error_mark_node;
7229 /* Like tsubst_expr for a BASELINK. OBJECT_TYPE, if non-NULL, is the
7230 type of the expression on the left-hand side of the "." or "->"
7234 tsubst_baselink (tree baselink, tree object_type,
7235 tree args, tsubst_flags_t complain, tree in_decl)
7238 tree qualifying_scope;
7240 tree template_args = 0;
7241 bool template_id_p = false;
7243 /* A baselink indicates a function from a base class. The
7244 BASELINK_ACCESS_BINFO and BASELINK_BINFO are going to have
7245 non-dependent types; otherwise, the lookup could not have
7246 succeeded. However, they may indicate bases of the template
7247 class, rather than the instantiated class.
7249 In addition, lookups that were not ambiguous before may be
7250 ambiguous now. Therefore, we perform the lookup again. */
7251 qualifying_scope = BINFO_TYPE (BASELINK_ACCESS_BINFO (baselink));
7252 fns = BASELINK_FUNCTIONS (baselink);
7253 if (TREE_CODE (fns) == TEMPLATE_ID_EXPR)
7255 template_id_p = true;
7256 template_args = TREE_OPERAND (fns, 1);
7257 fns = TREE_OPERAND (fns, 0);
7259 template_args = tsubst_template_args (template_args, args,
7262 name = DECL_NAME (get_first_fn (fns));
7263 baselink = lookup_fnfields (qualifying_scope, name, /*protect=*/1);
7264 if (BASELINK_P (baselink) && template_id_p)
7265 BASELINK_FUNCTIONS (baselink)
7266 = build_nt (TEMPLATE_ID_EXPR,
7267 BASELINK_FUNCTIONS (baselink),
7270 object_type = current_class_type;
7271 return adjust_result_of_qualified_name_lookup (baselink,
7276 /* Like tsubst_expr for a SCOPE_REF, given by QUALIFIED_ID. DONE is
7277 true if the qualified-id will be a postfix-expression in-and-of
7278 itself; false if more of the postfix-expression follows the
7279 QUALIFIED_ID. ADDRESS_P is true if the qualified-id is the operand
7283 tsubst_qualified_id (tree qualified_id, tree args,
7284 tsubst_flags_t complain, tree in_decl,
7285 bool done, bool address_p)
7293 my_friendly_assert (TREE_CODE (qualified_id) == SCOPE_REF, 20030706);
7295 /* Figure out what name to look up. */
7296 name = TREE_OPERAND (qualified_id, 1);
7297 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
7300 template_args = TREE_OPERAND (name, 1);
7302 template_args = tsubst_template_args (template_args, args,
7304 name = TREE_OPERAND (name, 0);
7308 is_template = false;
7309 template_args = NULL_TREE;
7312 /* Substitute into the qualifying scope. When there are no ARGS, we
7313 are just trying to simplify a non-dependent expression. In that
7314 case the qualifying scope may be dependent, and, in any case,
7315 substituting will not help. */
7316 scope = TREE_OPERAND (qualified_id, 0);
7319 scope = tsubst (scope, args, complain, in_decl);
7320 expr = tsubst_copy (name, args, complain, in_decl);
7325 if (dependent_type_p (scope))
7326 return build_nt (SCOPE_REF, scope, expr);
7328 if (!BASELINK_P (name) && !DECL_P (expr))
7330 expr = lookup_qualified_name (scope, expr, /*is_type_p=*/0, false);
7331 if (TREE_CODE (TREE_CODE (expr) == TEMPLATE_DECL
7332 ? DECL_TEMPLATE_RESULT (expr) : expr) == TYPE_DECL)
7334 if (complain & tf_error)
7336 error ("dependent-name `%E' is parsed as a non-type, but "
7337 "instantiation yields a type", qualified_id);
7338 inform ("say `typename %E' if a type is meant", qualified_id);
7340 return error_mark_node;
7345 check_accessibility_of_qualified_id (expr, /*object_type=*/NULL_TREE,
7348 /* Remember that there was a reference to this entity. */
7353 expr = lookup_template_function (expr, template_args);
7355 if (expr == error_mark_node && complain & tf_error)
7356 qualified_name_lookup_error (scope, TREE_OPERAND (qualified_id, 1));
7357 else if (TYPE_P (scope))
7359 expr = (adjust_result_of_qualified_name_lookup
7360 (expr, scope, current_class_type));
7361 expr = finish_qualified_id_expr (scope, expr, done, address_p);
7367 /* Like tsubst, but deals with expressions. This function just replaces
7368 template parms; to finish processing the resultant expression, use
7372 tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
7374 enum tree_code code;
7377 if (t == NULL_TREE || t == error_mark_node)
7380 code = TREE_CODE (t);
7385 r = retrieve_local_specialization (t);
7386 my_friendly_assert (r != NULL, 20020903);
7395 if (DECL_TEMPLATE_PARM_P (t))
7396 return tsubst_copy (DECL_INITIAL (t), args, complain, in_decl);
7397 /* There is no need to substitute into namespace-scope
7399 if (DECL_NAMESPACE_SCOPE_P (t))
7401 /* If ARGS is NULL, then T is known to be non-dependent. */
7402 if (args == NULL_TREE)
7403 return decl_constant_value (t);
7405 /* Unfortunately, we cannot just call lookup_name here.
7408 template <int I> int f() {
7410 struct S { void g() { E e = a; } };
7413 When we instantiate f<7>::S::g(), say, lookup_name is not
7414 clever enough to find f<7>::a. */
7416 = tsubst_aggr_type (TREE_TYPE (t), args, complain, in_decl,
7417 /*entering_scope=*/0);
7419 for (v = TYPE_VALUES (enum_type);
7422 if (TREE_PURPOSE (v) == DECL_NAME (t))
7423 return TREE_VALUE (v);
7425 /* We didn't find the name. That should never happen; if
7426 name-lookup found it during preliminary parsing, we
7427 should find it again here during instantiation. */
7433 if (DECL_CONTEXT (t))
7437 ctx = tsubst_aggr_type (DECL_CONTEXT (t), args, complain, in_decl,
7438 /*entering_scope=*/1);
7439 if (ctx != DECL_CONTEXT (t))
7440 return lookup_field (ctx, DECL_NAME (t), 0, false);
7446 if ((DECL_LANG_SPECIFIC (t) && DECL_TEMPLATE_INFO (t))
7447 || local_variable_p (t))
7448 t = tsubst (t, args, complain, in_decl);
7453 return tsubst_baselink (t, current_class_type, args, complain, in_decl);
7456 if (DECL_TEMPLATE_TEMPLATE_PARM_P (t))
7457 return tsubst (TREE_TYPE (DECL_TEMPLATE_RESULT (t)),
7458 args, complain, in_decl);
7459 else if (is_member_template (t))
7460 return tsubst (t, args, complain, in_decl);
7461 else if (DECL_CLASS_SCOPE_P (t)
7462 && uses_template_parms (DECL_CONTEXT (t)))
7464 /* Template template argument like the following example need
7467 template <template <class> class TT> struct C {};
7468 template <class T> struct D {
7469 template <class U> struct E {};
7474 We are processing the template argument `E' in #1 for
7475 the template instantiation #2. Originally, `E' is a
7476 TEMPLATE_DECL with `D<T>' as its DECL_CONTEXT. Now we
7477 have to substitute this with one having context `D<int>'. */
7479 tree context = tsubst (DECL_CONTEXT (t), args, complain, in_decl);
7480 return lookup_field (context, DECL_NAME(t), 0, false);
7483 /* Ordinary template template argument. */
7487 case REINTERPRET_CAST_EXPR:
7488 case CONST_CAST_EXPR:
7489 case STATIC_CAST_EXPR:
7490 case DYNAMIC_CAST_EXPR:
7493 (code, tsubst (TREE_TYPE (t), args, complain, in_decl),
7494 tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl));
7498 case TRUTH_NOT_EXPR:
7501 case CONVERT_EXPR: /* Unary + */
7510 (code, tsubst (TREE_TYPE (t), args, complain, in_decl),
7511 tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl));
7518 object = tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl);
7519 name = TREE_OPERAND (t, 1);
7520 if (TREE_CODE (name) == BIT_NOT_EXPR)
7522 name = tsubst_copy (TREE_OPERAND (name, 0), args,
7524 name = build1 (BIT_NOT_EXPR, NULL_TREE, name);
7526 else if (TREE_CODE (name) == SCOPE_REF
7527 && TREE_CODE (TREE_OPERAND (name, 1)) == BIT_NOT_EXPR)
7529 tree base = tsubst_copy (TREE_OPERAND (name, 0), args,
7531 name = TREE_OPERAND (name, 1);
7532 name = tsubst_copy (TREE_OPERAND (name, 0), args,
7534 name = build1 (BIT_NOT_EXPR, NULL_TREE, name);
7535 name = build_nt (SCOPE_REF, base, name);
7537 else if (TREE_CODE (name) == BASELINK)
7538 name = tsubst_baselink (name,
7539 non_reference (TREE_TYPE (object)),
7543 name = tsubst_copy (name, args, complain, in_decl);
7544 return build_nt (COMPONENT_REF, object, name, NULL_TREE);
7550 case TRUNC_DIV_EXPR:
7552 case FLOOR_DIV_EXPR:
7553 case ROUND_DIV_EXPR:
7554 case EXACT_DIV_EXPR:
7558 case TRUNC_MOD_EXPR:
7559 case FLOOR_MOD_EXPR:
7560 case TRUTH_ANDIF_EXPR:
7561 case TRUTH_ORIF_EXPR:
7562 case TRUTH_AND_EXPR:
7581 case PREDECREMENT_EXPR:
7582 case PREINCREMENT_EXPR:
7583 case POSTDECREMENT_EXPR:
7584 case POSTINCREMENT_EXPR:
7586 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7587 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl));
7590 return build_nt (code,
7591 tsubst_copy (TREE_OPERAND (t, 0), args,
7593 tsubst_copy (TREE_OPERAND (t, 1), args, complain,
7599 case PSEUDO_DTOR_EXPR:
7602 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7603 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl),
7604 tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl));
7611 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7612 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl),
7613 tsubst_copy (TREE_OPERAND (t, 2), args, complain, in_decl));
7614 NEW_EXPR_USE_GLOBAL (r) = NEW_EXPR_USE_GLOBAL (t);
7621 (code, tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl),
7622 tsubst_copy (TREE_OPERAND (t, 1), args, complain, in_decl));
7623 DELETE_EXPR_USE_GLOBAL (r) = DELETE_EXPR_USE_GLOBAL (t);
7624 DELETE_EXPR_USE_VEC (r) = DELETE_EXPR_USE_VEC (t);
7628 case TEMPLATE_ID_EXPR:
7630 /* Substituted template arguments */
7631 tree fn = TREE_OPERAND (t, 0);
7632 tree targs = TREE_OPERAND (t, 1);
7634 fn = tsubst_copy (fn, args, complain, in_decl);
7636 targs = tsubst_template_args (targs, args, complain, in_decl);
7638 return lookup_template_function (fn, targs);
7643 tree purpose, value, chain;
7645 if (t == void_list_node)
7648 purpose = TREE_PURPOSE (t);
7650 purpose = tsubst_copy (purpose, args, complain, in_decl);
7651 value = TREE_VALUE (t);
7653 value = tsubst_copy (value, args, complain, in_decl);
7654 chain = TREE_CHAIN (t);
7655 if (chain && chain != void_type_node)
7656 chain = tsubst_copy (chain, args, complain, in_decl);
7657 if (purpose == TREE_PURPOSE (t)
7658 && value == TREE_VALUE (t)
7659 && chain == TREE_CHAIN (t))
7661 return tree_cons (purpose, value, chain);
7668 case TEMPLATE_TYPE_PARM:
7669 case TEMPLATE_TEMPLATE_PARM:
7670 case BOUND_TEMPLATE_TEMPLATE_PARM:
7671 case TEMPLATE_PARM_INDEX:
7673 case REFERENCE_TYPE:
7679 case UNBOUND_CLASS_TEMPLATE:
7682 return tsubst (t, args, complain, in_decl);
7684 case IDENTIFIER_NODE:
7685 if (IDENTIFIER_TYPENAME_P (t))
7687 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
7688 return mangle_conv_op_name_for_type (new_type);
7695 r = build_constructor
7696 (tsubst (TREE_TYPE (t), args, complain, in_decl),
7697 tsubst_copy (CONSTRUCTOR_ELTS (t), args, complain, in_decl));
7698 TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t);
7703 return build_x_va_arg (tsubst_copy (TREE_OPERAND (t, 0), args, complain,
7705 tsubst (TREE_TYPE (t), args, complain, in_decl));
7707 case CLEANUP_POINT_EXPR:
7708 /* We shouldn't have built any of these during initial template
7709 generation. Instead, they should be built during instantiation
7710 in response to the saved STMT_IS_FULL_EXPR_P setting. */
7718 /* Like tsubst_copy for expressions, etc. but also does semantic
7722 tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl)
7724 /* Live only within one (recursive) call to tsubst_expr. We use
7725 this to pass the statement expression node from the STMT_EXPR
7726 to the EXPR_STMT that is its result. */
7727 static tree cur_stmt_expr;
7731 if (t == NULL_TREE || t == error_mark_node)
7734 if (EXPR_HAS_LOCATION (t))
7735 input_location = EXPR_LOCATION (t);
7736 if (STATEMENT_CODE_P (TREE_CODE (t)))
7737 current_stmt_tree ()->stmts_are_full_exprs_p = STMT_IS_FULL_EXPR_P (t);
7739 switch (TREE_CODE (t))
7741 case STATEMENT_LIST:
7743 tree_stmt_iterator i;
7744 for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i))
7745 tsubst_expr (tsi_stmt (i), args, complain, in_decl);
7749 case CTOR_INITIALIZER:
7750 finish_mem_initializers (tsubst_initializer_list
7751 (TREE_OPERAND (t, 0), args));
7755 finish_return_stmt (tsubst_expr (TREE_OPERAND (t, 0),
7756 args, complain, in_decl));
7761 tree old_stmt_expr = cur_stmt_expr;
7762 tree stmt_expr = begin_stmt_expr ();
7764 cur_stmt_expr = stmt_expr;
7765 tsubst_expr (STMT_EXPR_STMT (t), args, complain, in_decl);
7766 stmt_expr = finish_stmt_expr (stmt_expr, false);
7767 cur_stmt_expr = old_stmt_expr;
7773 tmp = tsubst_expr (EXPR_STMT_EXPR (t), args, complain, in_decl);
7774 if (EXPR_STMT_STMT_EXPR_RESULT (t))
7775 finish_stmt_expr_expr (tmp, cur_stmt_expr);
7777 finish_expr_stmt (tmp);
7781 do_using_directive (tsubst_expr (USING_STMT_NAMESPACE (t),
7782 args, complain, in_decl));
7790 decl = DECL_EXPR_DECL (t);
7791 if (TREE_CODE (decl) == LABEL_DECL)
7792 finish_label_decl (DECL_NAME (decl));
7793 else if (TREE_CODE (decl) == USING_DECL)
7795 tree scope = DECL_INITIAL (decl);
7796 tree name = DECL_NAME (decl);
7799 scope = tsubst_expr (scope, args, complain, in_decl);
7800 decl = lookup_qualified_name (scope, name,
7801 /*is_type_p=*/false,
7802 /*complain=*/false);
7803 if (decl == error_mark_node)
7804 qualified_name_lookup_error (scope, name);
7806 do_local_using_decl (decl, scope, name);
7810 init = DECL_INITIAL (decl);
7811 decl = tsubst (decl, args, complain, in_decl);
7812 if (decl != error_mark_node)
7815 DECL_INITIAL (decl) = error_mark_node;
7816 /* By marking the declaration as instantiated, we avoid
7817 trying to instantiate it. Since instantiate_decl can't
7818 handle local variables, and since we've already done
7819 all that needs to be done, that's the right thing to
7821 if (TREE_CODE (decl) == VAR_DECL)
7822 DECL_TEMPLATE_INSTANTIATED (decl) = 1;
7823 if (TREE_CODE (decl) == VAR_DECL
7824 && ANON_AGGR_TYPE_P (TREE_TYPE (decl)))
7825 /* Anonymous aggregates are a special case. */
7826 finish_anon_union (decl);
7829 maybe_push_decl (decl);
7830 if (TREE_CODE (decl) == VAR_DECL
7831 && DECL_PRETTY_FUNCTION_P (decl))
7833 /* For __PRETTY_FUNCTION__ we have to adjust the
7835 const char *const name
7836 = cxx_printable_name (current_function_decl, 2);
7837 init = cp_fname_init (name, &TREE_TYPE (decl));
7840 init = tsubst_expr (init, args, complain, in_decl);
7841 cp_finish_decl (decl, init, NULL_TREE, 0);
7846 /* A DECL_EXPR can also be used as an expression, in the condition
7847 clause of an if/for/while construct. */
7852 stmt = begin_for_stmt ();
7853 tsubst_expr (FOR_INIT_STMT (t), args, complain, in_decl);
7854 finish_for_init_stmt (stmt);
7855 tmp = tsubst_expr (FOR_COND (t), args, complain, in_decl);
7856 finish_for_cond (tmp, stmt);
7857 tmp = tsubst_expr (FOR_EXPR (t), args, complain, in_decl);
7858 finish_for_expr (tmp, stmt);
7859 tsubst_expr (FOR_BODY (t), args, complain, in_decl);
7860 finish_for_stmt (stmt);
7864 stmt = begin_while_stmt ();
7865 tmp = tsubst_expr (WHILE_COND (t), args, complain, in_decl);
7866 finish_while_stmt_cond (tmp, stmt);
7867 tsubst_expr (WHILE_BODY (t), args, complain, in_decl);
7868 finish_while_stmt (stmt);
7872 stmt = begin_do_stmt ();
7873 tsubst_expr (DO_BODY (t), args, complain, in_decl);
7874 finish_do_body (stmt);
7875 tmp = tsubst_expr (DO_COND (t), args, complain, in_decl);
7876 finish_do_stmt (tmp, stmt);
7880 stmt = begin_if_stmt ();
7881 tmp = tsubst_expr (IF_COND (t), args, complain, in_decl);
7882 finish_if_stmt_cond (tmp, stmt);
7883 tsubst_expr (THEN_CLAUSE (t), args, complain, in_decl);
7884 finish_then_clause (stmt);
7886 if (ELSE_CLAUSE (t))
7888 begin_else_clause (stmt);
7889 tsubst_expr (ELSE_CLAUSE (t), args, complain, in_decl);
7890 finish_else_clause (stmt);
7893 finish_if_stmt (stmt);
7897 if (BIND_EXPR_BODY_BLOCK (t))
7898 stmt = begin_function_body ();
7900 stmt = begin_compound_stmt (BIND_EXPR_TRY_BLOCK (t)
7901 ? BCS_TRY_BLOCK : 0);
7903 tsubst_expr (BIND_EXPR_BODY (t), args, complain, in_decl);
7905 if (BIND_EXPR_BODY_BLOCK (t))
7906 finish_function_body (stmt);
7908 finish_compound_stmt (stmt);
7912 finish_break_stmt ();
7916 finish_continue_stmt ();
7920 stmt = begin_switch_stmt ();
7921 tmp = tsubst_expr (SWITCH_COND (t), args, complain, in_decl);
7922 finish_switch_cond (tmp, stmt);
7923 tsubst_expr (SWITCH_BODY (t), args, complain, in_decl);
7924 finish_switch_stmt (stmt);
7927 case CASE_LABEL_EXPR:
7928 finish_case_label (tsubst_expr (CASE_LOW (t), args, complain, in_decl),
7929 tsubst_expr (CASE_HIGH (t), args, complain,
7934 finish_label_stmt (DECL_NAME (LABEL_EXPR_LABEL (t)));
7938 tmp = GOTO_DESTINATION (t);
7939 if (TREE_CODE (tmp) != LABEL_DECL)
7940 /* Computed goto's must be tsubst'd into. On the other hand,
7941 non-computed gotos must not be; the identifier in question
7942 will have no binding. */
7943 tmp = tsubst_expr (tmp, args, complain, in_decl);
7945 tmp = DECL_NAME (tmp);
7946 finish_goto_stmt (tmp);
7950 tmp = finish_asm_stmt
7951 (ASM_VOLATILE_P (t),
7952 tsubst_expr (ASM_STRING (t), args, complain, in_decl),
7953 tsubst_expr (ASM_OUTPUTS (t), args, complain, in_decl),
7954 tsubst_expr (ASM_INPUTS (t), args, complain, in_decl),
7955 tsubst_expr (ASM_CLOBBERS (t), args, complain, in_decl));
7956 ASM_INPUT_P (tmp) = ASM_INPUT_P (t);
7962 stmt = begin_try_block ();
7963 tsubst_expr (TRY_STMTS (t), args, complain, in_decl);
7964 finish_cleanup_try_block (stmt);
7965 finish_cleanup (tsubst_expr (TRY_HANDLERS (t), args,
7971 if (FN_TRY_BLOCK_P (t))
7972 stmt = begin_function_try_block ();
7974 stmt = begin_try_block ();
7976 tsubst_expr (TRY_STMTS (t), args, complain, in_decl);
7978 if (FN_TRY_BLOCK_P (t))
7979 finish_function_try_block (stmt);
7981 finish_try_block (stmt);
7983 tsubst_expr (TRY_HANDLERS (t), args, complain, in_decl);
7984 if (FN_TRY_BLOCK_P (t))
7985 finish_function_handler_sequence (stmt);
7987 finish_handler_sequence (stmt);
7995 stmt = begin_handler ();
7996 if (HANDLER_PARMS (t))
7998 decl = HANDLER_PARMS (t);
7999 decl = tsubst (decl, args, complain, in_decl);
8000 /* Prevent instantiate_decl from trying to instantiate
8001 this variable. We've already done all that needs to be
8003 DECL_TEMPLATE_INSTANTIATED (decl) = 1;
8007 finish_handler_parms (decl, stmt);
8008 tsubst_expr (HANDLER_BODY (t), args, complain, in_decl);
8009 finish_handler (stmt);
8014 tsubst (TREE_TYPE (t), args, complain, NULL_TREE);
8018 if (!STATEMENT_CODE_P (TREE_CODE (t)))
8019 return tsubst_copy_and_build (t, args, complain, in_decl,
8020 /*function_p=*/false);
8027 /* T is a postfix-expression that is not being used in a function
8028 call. Return the substituted version of T. */
8031 tsubst_non_call_postfix_expression (tree t, tree args,
8032 tsubst_flags_t complain,
8035 if (TREE_CODE (t) == SCOPE_REF)
8036 t = tsubst_qualified_id (t, args, complain, in_decl,
8037 /*done=*/false, /*address_p=*/false);
8039 t = tsubst_copy_and_build (t, args, complain, in_decl,
8040 /*function_p=*/false);
8045 /* Like tsubst but deals with expressions and performs semantic
8046 analysis. FUNCTION_P is true if T is the "F" in "F (ARGS)". */
8049 tsubst_copy_and_build (tree t,
8051 tsubst_flags_t complain,
8055 #define RECUR(NODE) \
8056 tsubst_copy_and_build (NODE, args, complain, in_decl, /*function_p=*/false)
8060 if (t == NULL_TREE || t == error_mark_node)
8063 switch (TREE_CODE (t))
8068 case IDENTIFIER_NODE:
8072 tree qualifying_class;
8073 bool non_integral_constant_expression_p;
8074 const char *error_msg;
8076 if (IDENTIFIER_TYPENAME_P (t))
8078 tree new_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
8079 t = mangle_conv_op_name_for_type (new_type);
8082 /* Look up the name. */
8083 decl = lookup_name (t, 0);
8085 /* By convention, expressions use ERROR_MARK_NODE to indicate
8086 failure, not NULL_TREE. */
8087 if (decl == NULL_TREE)
8088 decl = error_mark_node;
8090 decl = finish_id_expression (t, decl, NULL_TREE,
8093 /*integral_constant_expression_p=*/false,
8094 /*allow_non_integral_constant_expression_p=*/false,
8095 &non_integral_constant_expression_p,
8099 if (!function_p && TREE_CODE (decl) == IDENTIFIER_NODE)
8100 decl = unqualified_name_lookup_error (decl);
8104 case TEMPLATE_ID_EXPR:
8107 tree template = RECUR (TREE_OPERAND (t, 0));
8108 tree targs = TREE_OPERAND (t, 1);
8111 targs = tsubst_template_args (targs, args, complain, in_decl);
8113 if (TREE_CODE (template) == COMPONENT_REF)
8115 object = TREE_OPERAND (template, 0);
8116 template = TREE_OPERAND (template, 1);
8120 template = lookup_template_function (template, targs);
8123 return build (COMPONENT_REF, TREE_TYPE (template),
8124 object, template, NULL_TREE);
8130 return build_x_indirect_ref (RECUR (TREE_OPERAND (t, 0)), "unary *");
8134 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8135 RECUR (TREE_OPERAND (t, 0)));
8138 return build_functional_cast
8139 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8140 RECUR (TREE_OPERAND (t, 0)));
8142 case REINTERPRET_CAST_EXPR:
8143 return build_reinterpret_cast
8144 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8145 RECUR (TREE_OPERAND (t, 0)));
8147 case CONST_CAST_EXPR:
8148 return build_const_cast
8149 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8150 RECUR (TREE_OPERAND (t, 0)));
8152 case DYNAMIC_CAST_EXPR:
8153 return build_dynamic_cast
8154 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8155 RECUR (TREE_OPERAND (t, 0)));
8157 case STATIC_CAST_EXPR:
8158 return build_static_cast
8159 (tsubst (TREE_TYPE (t), args, complain, in_decl),
8160 RECUR (TREE_OPERAND (t, 0)));
8162 case POSTDECREMENT_EXPR:
8163 case POSTINCREMENT_EXPR:
8164 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8165 args, complain, in_decl);
8166 return build_x_unary_op (TREE_CODE (t), op1);
8168 case PREDECREMENT_EXPR:
8169 case PREINCREMENT_EXPR:
8173 case TRUTH_NOT_EXPR:
8174 case CONVERT_EXPR: /* Unary + */
8177 return build_x_unary_op (TREE_CODE (t), RECUR (TREE_OPERAND (t, 0)));
8180 op1 = TREE_OPERAND (t, 0);
8181 if (TREE_CODE (op1) == SCOPE_REF)
8182 op1 = tsubst_qualified_id (op1, args, complain, in_decl,
8183 /*done=*/true, /*address_p=*/true);
8185 op1 = tsubst_non_call_postfix_expression (op1, args, complain,
8187 if (TREE_CODE (op1) == LABEL_DECL)
8188 return finish_label_address_expr (DECL_NAME (op1));
8189 return build_x_unary_op (ADDR_EXPR, op1);
8194 case TRUNC_DIV_EXPR:
8196 case FLOOR_DIV_EXPR:
8197 case ROUND_DIV_EXPR:
8198 case EXACT_DIV_EXPR:
8202 case TRUNC_MOD_EXPR:
8203 case FLOOR_MOD_EXPR:
8204 case TRUTH_ANDIF_EXPR:
8205 case TRUTH_ORIF_EXPR:
8206 case TRUTH_AND_EXPR:
8222 return build_x_binary_op
8224 RECUR (TREE_OPERAND (t, 0)),
8225 RECUR (TREE_OPERAND (t, 1)),
8226 /*overloaded_p=*/NULL);
8229 return tsubst_qualified_id (t, args, complain, in_decl, /*done=*/true,
8230 /*address_p=*/false);
8233 if (tsubst_copy (TREE_OPERAND (t, 0), args, complain, in_decl)
8236 return build_nt (ARRAY_REF, NULL_TREE, RECUR (TREE_OPERAND (t, 1)),
8237 NULL_TREE, NULL_TREE);
8239 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8240 args, complain, in_decl);
8241 /* Remember that there was a reference to this entity. */
8244 return grok_array_decl (op1, RECUR (TREE_OPERAND (t, 1)));
8248 op1 = TREE_OPERAND (t, 0);
8251 /* When there are no ARGS, we are trying to evaluate a
8252 non-dependent expression from the parser. Trying to do
8253 the substitutions may not work. */
8255 op1 = TREE_TYPE (op1);
8264 return cxx_sizeof_or_alignof_type (op1, TREE_CODE (t), true);
8266 return cxx_sizeof_or_alignof_expr (op1, TREE_CODE (t));
8269 return build_x_modify_expr
8270 (RECUR (TREE_OPERAND (t, 0)),
8271 TREE_CODE (TREE_OPERAND (t, 1)),
8272 RECUR (TREE_OPERAND (t, 2)));
8275 op1 = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8276 args, complain, in_decl);
8277 /* Remember that there was a reference to this entity. */
8280 return build_x_arrow (op1);
8284 (RECUR (TREE_OPERAND (t, 0)),
8285 RECUR (TREE_OPERAND (t, 1)),
8286 RECUR (TREE_OPERAND (t, 2)),
8287 RECUR (TREE_OPERAND (t, 3)),
8288 NEW_EXPR_USE_GLOBAL (t));
8291 return delete_sanity
8292 (RECUR (TREE_OPERAND (t, 0)),
8293 RECUR (TREE_OPERAND (t, 1)),
8294 DELETE_EXPR_USE_VEC (t),
8295 DELETE_EXPR_USE_GLOBAL (t));
8298 return build_x_compound_expr (RECUR (TREE_OPERAND (t, 0)),
8299 RECUR (TREE_OPERAND (t, 1)));
8308 function = TREE_OPERAND (t, 0);
8309 /* When we parsed the expression, we determined whether or
8310 not Koenig lookup should be performed. */
8311 koenig_p = KOENIG_LOOKUP_P (t);
8312 if (TREE_CODE (function) == SCOPE_REF)
8315 function = tsubst_qualified_id (function, args, complain, in_decl,
8317 /*address_p=*/false);
8321 qualified_p = (TREE_CODE (function) == COMPONENT_REF
8322 && (TREE_CODE (TREE_OPERAND (function, 1))
8324 function = tsubst_copy_and_build (function, args, complain,
8327 if (BASELINK_P (function))
8331 call_args = RECUR (TREE_OPERAND (t, 1));
8333 /* We do not perform argument-dependent lookup if normal
8334 lookup finds a non-function, in accordance with the
8335 expected resolution of DR 218. */
8337 && (is_overloaded_fn (function)
8338 || TREE_CODE (function) == IDENTIFIER_NODE))
8339 function = perform_koenig_lookup (function, call_args);
8341 if (TREE_CODE (function) == IDENTIFIER_NODE)
8343 unqualified_name_lookup_error (function);
8344 return error_mark_node;
8347 /* Remember that there was a reference to this entity. */
8348 if (DECL_P (function))
8349 mark_used (function);
8351 function = convert_from_reference (function);
8353 if (TREE_CODE (function) == OFFSET_REF)
8354 return build_offset_ref_call_from_tree (function, call_args);
8355 if (TREE_CODE (function) == COMPONENT_REF)
8357 if (!BASELINK_P (TREE_OPERAND (function, 1)))
8358 return finish_call_expr (function, call_args,
8359 /*disallow_virtual=*/false,
8360 /*koenig_p=*/false);
8362 return (build_new_method_call
8363 (TREE_OPERAND (function, 0),
8364 TREE_OPERAND (function, 1),
8365 call_args, NULL_TREE,
8366 qualified_p ? LOOKUP_NONVIRTUAL : LOOKUP_NORMAL));
8368 return finish_call_expr (function, call_args,
8369 /*disallow_virtual=*/qualified_p,
8374 return build_x_conditional_expr
8375 (RECUR (TREE_OPERAND (t, 0)),
8376 RECUR (TREE_OPERAND (t, 1)),
8377 RECUR (TREE_OPERAND (t, 2)));
8379 case PSEUDO_DTOR_EXPR:
8380 return finish_pseudo_destructor_expr
8381 (RECUR (TREE_OPERAND (t, 0)),
8382 RECUR (TREE_OPERAND (t, 1)),
8383 RECUR (TREE_OPERAND (t, 2)));
8387 tree purpose, value, chain;
8389 if (t == void_list_node)
8392 purpose = TREE_PURPOSE (t);
8394 purpose = RECUR (purpose);
8395 value = TREE_VALUE (t);
8397 value = RECUR (value);
8398 chain = TREE_CHAIN (t);
8399 if (chain && chain != void_type_node)
8400 chain = RECUR (chain);
8401 if (purpose == TREE_PURPOSE (t)
8402 && value == TREE_VALUE (t)
8403 && chain == TREE_CHAIN (t))
8405 return tree_cons (purpose, value, chain);
8413 object = tsubst_non_call_postfix_expression (TREE_OPERAND (t, 0),
8414 args, complain, in_decl);
8415 /* Remember that there was a reference to this entity. */
8416 if (DECL_P (object))
8419 member = TREE_OPERAND (t, 1);
8420 if (BASELINK_P (member))
8421 member = tsubst_baselink (member,
8422 non_reference (TREE_TYPE (object)),
8423 args, complain, in_decl);
8425 member = tsubst_copy (member, args, complain, in_decl);
8427 if (!CLASS_TYPE_P (TREE_TYPE (object)))
8429 if (TREE_CODE (member) == BIT_NOT_EXPR)
8430 return finish_pseudo_destructor_expr (object,
8432 TREE_TYPE (object));
8433 else if (TREE_CODE (member) == SCOPE_REF
8434 && (TREE_CODE (TREE_OPERAND (member, 1)) == BIT_NOT_EXPR))
8435 return finish_pseudo_destructor_expr (object,
8437 TREE_TYPE (object));
8439 else if (TREE_CODE (member) == SCOPE_REF
8440 && TREE_CODE (TREE_OPERAND (member, 1)) == TEMPLATE_ID_EXPR)
8445 /* Lookup the template functions now that we know what the
8447 tmpl = TREE_OPERAND (TREE_OPERAND (member, 1), 0);
8448 args = TREE_OPERAND (TREE_OPERAND (member, 1), 1);
8449 member = lookup_qualified_name (TREE_OPERAND (member, 0), tmpl,
8450 /*is_type_p=*/false,
8451 /*complain=*/false);
8452 if (BASELINK_P (member))
8453 BASELINK_FUNCTIONS (member)
8454 = build_nt (TEMPLATE_ID_EXPR, BASELINK_FUNCTIONS (member),
8458 qualified_name_lookup_error (TREE_TYPE (object), tmpl);
8459 return error_mark_node;
8462 else if (TREE_CODE (member) == FIELD_DECL)
8463 return finish_non_static_data_member (member, object, NULL_TREE);
8465 return finish_class_member_access_expr (object, member);
8470 (RECUR (TREE_OPERAND (t, 0)));
8476 tree type = tsubst (TREE_TYPE (t), args, complain, in_decl);
8479 /* digest_init will do the wrong thing if we let it. */
8480 if (type && TYPE_PTRMEMFUNC_P (type))
8484 /* We do not want to process the purpose of aggregate
8485 initializers as they are identifier nodes which will be
8486 looked up by digest_init. */
8487 purpose_p = !(type && IS_AGGR_TYPE (type));
8488 for (elts = CONSTRUCTOR_ELTS (t);
8490 elts = TREE_CHAIN (elts))
8492 tree purpose = TREE_PURPOSE (elts);
8493 tree value = TREE_VALUE (elts);
8495 if (purpose && purpose_p)
8496 purpose = RECUR (purpose);
8497 value = RECUR (value);
8498 r = tree_cons (purpose, value, r);
8501 r = build_constructor (NULL_TREE, nreverse (r));
8502 TREE_HAS_CONSTRUCTOR (r) = TREE_HAS_CONSTRUCTOR (t);
8505 return digest_init (type, r, 0);
8511 tree operand_0 = RECUR (TREE_OPERAND (t, 0));
8512 if (TYPE_P (operand_0))
8513 return get_typeid (operand_0);
8514 return build_typeid (operand_0);
8518 return convert_from_reference (tsubst_copy (t, args, complain, in_decl));
8522 t = tsubst_copy (t, args, complain, in_decl);
8523 return convert_from_reference (t);
8526 return build_x_va_arg (RECUR (TREE_OPERAND (t, 0)),
8527 tsubst_copy (TREE_TYPE (t), args, complain,
8531 return tsubst_copy (t, args, complain, in_decl);
8537 /* Verify that the instantiated ARGS are valid. For type arguments,
8538 make sure that the type's linkage is ok. For non-type arguments,
8539 make sure they are constants if they are integral or enumerations.
8540 Emit an error under control of COMPLAIN, and return TRUE on error. */
8543 check_instantiated_args (tree tmpl, tree args, tsubst_flags_t complain)
8545 int ix, len = DECL_NTPARMS (tmpl);
8546 bool result = false;
8548 for (ix = 0; ix != len; ix++)
8550 tree t = TREE_VEC_ELT (args, ix);
8554 /* [basic.link]: A name with no linkage (notably, the name
8555 of a class or enumeration declared in a local scope)
8556 shall not be used to declare an entity with linkage.
8557 This implies that names with no linkage cannot be used as
8558 template arguments. */
8559 tree nt = no_linkage_check (t);
8563 if (!(complain & tf_error))
8565 else if (TYPE_ANONYMOUS_P (nt))
8566 error ("`%T' uses anonymous type", t);
8568 error ("`%T' uses local type `%T'", t, nt);
8571 /* In order to avoid all sorts of complications, we do not
8572 allow variably-modified types as template arguments. */
8573 else if (variably_modified_type_p (t, NULL_TREE))
8575 if (complain & tf_error)
8576 error ("`%T' is a variably modified type", t);
8580 /* A non-type argument of integral or enumerated type must be a
8582 else if (TREE_TYPE (t)
8583 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t))
8584 && !TREE_CONSTANT (t))
8586 if (complain & tf_error)
8587 error ("integral expression `%E' is not constant", t);
8591 if (result && complain & tf_error)
8592 error (" trying to instantiate `%D'", tmpl);
8596 /* Instantiate the indicated variable or function template TMPL with
8597 the template arguments in TARG_PTR. */
8600 instantiate_template (tree tmpl, tree targ_ptr, tsubst_flags_t complain)
8606 if (tmpl == error_mark_node)
8607 return error_mark_node;
8609 my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 283);
8611 /* If this function is a clone, handle it specially. */
8612 if (DECL_CLONED_FUNCTION_P (tmpl))
8617 spec = instantiate_template (DECL_CLONED_FUNCTION (tmpl), targ_ptr,
8619 if (spec == error_mark_node)
8620 return error_mark_node;
8622 /* Look for the clone. */
8623 for (clone = TREE_CHAIN (spec);
8624 clone && DECL_CLONED_FUNCTION_P (clone);
8625 clone = TREE_CHAIN (clone))
8626 if (DECL_NAME (clone) == DECL_NAME (tmpl))
8628 /* We should always have found the clone by now. */
8633 /* Check to see if we already have this specialization. */
8634 spec = retrieve_specialization (tmpl, targ_ptr);
8635 if (spec != NULL_TREE)
8638 gen_tmpl = most_general_template (tmpl);
8639 if (tmpl != gen_tmpl)
8641 /* The TMPL is a partial instantiation. To get a full set of
8642 arguments we must add the arguments used to perform the
8643 partial instantiation. */
8644 targ_ptr = add_outermost_template_args (DECL_TI_ARGS (tmpl),
8647 /* Check to see if we already have this specialization. */
8648 spec = retrieve_specialization (gen_tmpl, targ_ptr);
8649 if (spec != NULL_TREE)
8653 if (check_instantiated_args (gen_tmpl, INNERMOST_TEMPLATE_ARGS (targ_ptr),
8655 return error_mark_node;
8657 /* We are building a FUNCTION_DECL, during which the access of its
8658 parameters and return types have to be checked. However this
8659 FUNCTION_DECL which is the desired context for access checking
8660 is not built yet. We solve this chicken-and-egg problem by
8661 deferring all checks until we have the FUNCTION_DECL. */
8662 push_deferring_access_checks (dk_deferred);
8664 /* Substitute template parameters. */
8665 fndecl = tsubst (DECL_TEMPLATE_RESULT (gen_tmpl),
8666 targ_ptr, complain, gen_tmpl);
8668 /* Now we know the specialization, compute access previously
8670 push_access_scope (fndecl);
8671 perform_deferred_access_checks ();
8672 pop_access_scope (fndecl);
8673 pop_deferring_access_checks ();
8675 /* The DECL_TI_TEMPLATE should always be the immediate parent
8676 template, not the most general template. */
8677 DECL_TI_TEMPLATE (fndecl) = tmpl;
8679 /* If we've just instantiated the main entry point for a function,
8680 instantiate all the alternate entry points as well. We do this
8681 by cloning the instantiation of the main entry point, not by
8682 instantiating the template clones. */
8683 if (TREE_CHAIN (gen_tmpl) && DECL_CLONED_FUNCTION_P (TREE_CHAIN (gen_tmpl)))
8684 clone_function_decl (fndecl, /*update_method_vec_p=*/0);
8689 /* The FN is a TEMPLATE_DECL for a function. The ARGS are the
8690 arguments that are being used when calling it. TARGS is a vector
8691 into which the deduced template arguments are placed.
8693 Return zero for success, 2 for an incomplete match that doesn't resolve
8694 all the types, and 1 for complete failure. An error message will be
8695 printed only for an incomplete match.
8697 If FN is a conversion operator, or we are trying to produce a specific
8698 specialization, RETURN_TYPE is the return type desired.
8700 The EXPLICIT_TARGS are explicit template arguments provided via a
8703 The parameter STRICT is one of:
8706 We are deducing arguments for a function call, as in
8710 We are deducing arguments for a conversion function, as in
8714 We are deducing arguments when doing an explicit instantiation
8715 as in [temp.explicit], when determining an explicit specialization
8716 as in [temp.expl.spec], or when taking the address of a function
8717 template, as in [temp.deduct.funcaddr].
8720 We are deducing arguments when calculating the partial
8721 ordering between specializations of function or class
8722 templates, as in [temp.func.order] and [temp.class.order].
8724 LEN is the number of parms to consider before returning success, or -1
8725 for all. This is used in partial ordering to avoid comparing parms for
8726 which no actual argument was passed, since they are not considered in
8727 overload resolution (and are explicitly excluded from consideration in
8728 partial ordering in [temp.func.order]/6). */
8731 fn_type_unification (tree fn,
8732 tree explicit_targs,
8736 unification_kind_t strict,
8743 my_friendly_assert (TREE_CODE (fn) == TEMPLATE_DECL, 0);
8745 fntype = TREE_TYPE (fn);
8750 The specified template arguments must match the template
8751 parameters in kind (i.e., type, nontype, template), and there
8752 must not be more arguments than there are parameters;
8753 otherwise type deduction fails.
8755 Nontype arguments must match the types of the corresponding
8756 nontype template parameters, or must be convertible to the
8757 types of the corresponding nontype parameters as specified in
8758 _temp.arg.nontype_, otherwise type deduction fails.
8760 All references in the function type of the function template
8761 to the corresponding template parameters are replaced by the
8762 specified template argument values. If a substitution in a
8763 template parameter or in the function type of the function
8764 template results in an invalid type, type deduction fails. */
8766 tree converted_args;
8770 = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (fn),
8771 explicit_targs, NULL_TREE, tf_none,
8772 /*require_all_arguments=*/0));
8773 if (converted_args == error_mark_node)
8776 /* Substitute the explicit args into the function type. This is
8777 necessary so that, for instance, explicitly declared function
8778 arguments can match null pointed constants. If we were given
8779 an incomplete set of explicit args, we must not do semantic
8780 processing during substitution as we could create partial
8782 incomplete = NUM_TMPL_ARGS (explicit_targs) != NUM_TMPL_ARGS (targs);
8783 processing_template_decl += incomplete;
8784 fntype = tsubst (fntype, converted_args, tf_none, NULL_TREE);
8785 processing_template_decl -= incomplete;
8787 if (fntype == error_mark_node)
8790 /* Place the explicitly specified arguments in TARGS. */
8791 for (i = NUM_TMPL_ARGS (converted_args); i--;)
8792 TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (converted_args, i);
8795 parms = TYPE_ARG_TYPES (fntype);
8796 /* Never do unification on the 'this' parameter. */
8797 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn))
8798 parms = TREE_CHAIN (parms);
8802 /* We've been given a return type to match, prepend it. */
8803 parms = tree_cons (NULL_TREE, TREE_TYPE (fntype), parms);
8804 args = tree_cons (NULL_TREE, return_type, args);
8809 /* We allow incomplete unification without an error message here
8810 because the standard doesn't seem to explicitly prohibit it. Our
8811 callers must be ready to deal with unification failures in any
8813 result = type_unification_real (DECL_INNERMOST_TEMPLATE_PARMS (fn),
8814 targs, parms, args, /*subr=*/0,
8815 strict, /*allow_incomplete*/1, len);
8818 /* All is well so far. Now, check:
8822 When all template arguments have been deduced, all uses of
8823 template parameters in nondeduced contexts are replaced with
8824 the corresponding deduced argument values. If the
8825 substitution results in an invalid type, as described above,
8826 type deduction fails. */
8827 if (tsubst (TREE_TYPE (fn), targs, tf_none, NULL_TREE)
8834 /* Adjust types before performing type deduction, as described in
8835 [temp.deduct.call] and [temp.deduct.conv]. The rules in these two
8836 sections are symmetric. PARM is the type of a function parameter
8837 or the return type of the conversion function. ARG is the type of
8838 the argument passed to the call, or the type of the value
8839 initialized with the result of the conversion function. */
8842 maybe_adjust_types_for_deduction (unification_kind_t strict,
8855 /* Swap PARM and ARG throughout the remainder of this
8856 function; the handling is precisely symmetric since PARM
8857 will initialize ARG rather than vice versa. */
8865 /* There is nothing to do in this case. */
8869 /* DR 214. [temp.func.order] is underspecified, and leads to no
8870 ordering between things like `T *' and `T const &' for `U *'.
8871 The former has T=U and the latter T=U*. The former looks more
8872 specialized and John Spicer considers it well-formed (the EDG
8873 compiler accepts it).
8875 John also confirms that deduction should proceed as in a function
8876 call. Which implies the usual ARG and PARM conversions as DEDUCE_CALL.
8877 However, in ordering, ARG can have REFERENCE_TYPE, but no argument
8878 to an actual call can have such a type.
8880 If both ARG and PARM are REFERENCE_TYPE, we change neither.
8881 If only ARG is a REFERENCE_TYPE, we look through that and then
8882 proceed as with DEDUCE_CALL (which could further convert it). */
8883 if (TREE_CODE (*arg) == REFERENCE_TYPE)
8885 if (TREE_CODE (*parm) == REFERENCE_TYPE)
8887 *arg = TREE_TYPE (*arg);
8894 if (TREE_CODE (*parm) != REFERENCE_TYPE)
8896 /* [temp.deduct.call]
8898 If P is not a reference type:
8900 --If A is an array type, the pointer type produced by the
8901 array-to-pointer standard conversion (_conv.array_) is
8902 used in place of A for type deduction; otherwise,
8904 --If A is a function type, the pointer type produced by
8905 the function-to-pointer standard conversion
8906 (_conv.func_) is used in place of A for type deduction;
8909 --If A is a cv-qualified type, the top level
8910 cv-qualifiers of A's type are ignored for type
8912 if (TREE_CODE (*arg) == ARRAY_TYPE)
8913 *arg = build_pointer_type (TREE_TYPE (*arg));
8914 else if (TREE_CODE (*arg) == FUNCTION_TYPE)
8915 *arg = build_pointer_type (*arg);
8917 *arg = TYPE_MAIN_VARIANT (*arg);
8920 /* [temp.deduct.call]
8922 If P is a cv-qualified type, the top level cv-qualifiers
8923 of P's type are ignored for type deduction. If P is a
8924 reference type, the type referred to by P is used for
8926 *parm = TYPE_MAIN_VARIANT (*parm);
8927 if (TREE_CODE (*parm) == REFERENCE_TYPE)
8929 *parm = TREE_TYPE (*parm);
8930 result |= UNIFY_ALLOW_OUTER_MORE_CV_QUAL;
8933 /* DR 322. For conversion deduction, remove a reference type on parm
8934 too (which has been swapped into ARG). */
8935 if (strict == DEDUCE_CONV && TREE_CODE (*arg) == REFERENCE_TYPE)
8936 *arg = TREE_TYPE (*arg);
8941 /* Most parms like fn_type_unification.
8943 If SUBR is 1, we're being called recursively (to unify the
8944 arguments of a function or method parameter of a function
8948 type_unification_real (tree tparms,
8953 unification_kind_t strict,
8954 int allow_incomplete,
8959 int ntparms = TREE_VEC_LENGTH (tparms);
8961 int saw_undeduced = 0;
8965 my_friendly_assert (TREE_CODE (tparms) == TREE_VEC, 289);
8966 my_friendly_assert (xparms == NULL_TREE
8967 || TREE_CODE (xparms) == TREE_LIST, 290);
8968 my_friendly_assert (!xargs || TREE_CODE (xargs) == TREE_LIST, 291);
8969 my_friendly_assert (ntparms > 0, 292);
8974 sub_strict = (UNIFY_ALLOW_OUTER_LEVEL | UNIFY_ALLOW_MORE_CV_QUAL
8975 | UNIFY_ALLOW_DERIVED);
8979 sub_strict = UNIFY_ALLOW_LESS_CV_QUAL;
8983 sub_strict = UNIFY_ALLOW_NONE;
8987 sub_strict = UNIFY_ALLOW_NONE;
9003 && parms != void_list_node
9005 && args != void_list_node)
9007 parm = TREE_VALUE (parms);
9008 parms = TREE_CHAIN (parms);
9009 arg = TREE_VALUE (args);
9010 args = TREE_CHAIN (args);
9012 if (arg == error_mark_node)
9014 if (arg == unknown_type_node)
9015 /* We can't deduce anything from this, but we might get all the
9016 template args from other function args. */
9019 /* Conversions will be performed on a function argument that
9020 corresponds with a function parameter that contains only
9021 non-deducible template parameters and explicitly specified
9022 template parameters. */
9023 if (!uses_template_parms (parm))
9028 type = TREE_TYPE (arg);
9032 if (strict == DEDUCE_EXACT || strict == DEDUCE_ORDER)
9034 if (same_type_p (parm, type))
9038 /* It might work; we shouldn't check now, because we might
9039 get into infinite recursion. Overload resolution will
9048 my_friendly_assert (TREE_TYPE (arg) != NULL_TREE, 293);
9049 if (type_unknown_p (arg))
9051 /* [temp.deduct.type] A template-argument can be deduced from
9052 a pointer to function or pointer to member function
9053 argument if the set of overloaded functions does not
9054 contain function templates and at most one of a set of
9055 overloaded functions provides a unique match. */
9057 if (resolve_overloaded_unification
9058 (tparms, targs, parm, arg, strict, sub_strict)
9063 arg = TREE_TYPE (arg);
9064 if (arg == error_mark_node)
9069 int arg_strict = sub_strict;
9072 arg_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg);
9074 if (unify (tparms, targs, parm, arg, arg_strict))
9078 /* Are we done with the interesting parms? */
9082 /* Fail if we've reached the end of the parm list, and more args
9083 are present, and the parm list isn't variadic. */
9084 if (args && args != void_list_node && parms == void_list_node)
9086 /* Fail if parms are left and they don't have default values. */
9088 && parms != void_list_node
9089 && TREE_PURPOSE (parms) == NULL_TREE)
9094 for (i = 0; i < ntparms; i++)
9095 if (TREE_VEC_ELT (targs, i) == NULL_TREE)
9097 tree tparm = TREE_VALUE (TREE_VEC_ELT (tparms, i));
9099 /* If this is an undeduced nontype parameter that depends on
9100 a type parameter, try another pass; its type may have been
9101 deduced from a later argument than the one from which
9102 this parameter can be deduced. */
9103 if (TREE_CODE (tparm) == PARM_DECL
9104 && uses_template_parms (TREE_TYPE (tparm))
9105 && !saw_undeduced++)
9108 if (!allow_incomplete)
9109 error ("incomplete type unification");
9115 /* Subroutine of type_unification_real. Args are like the variables at the
9116 call site. ARG is an overloaded function (or template-id); we try
9117 deducing template args from each of the overloads, and if only one
9118 succeeds, we go with that. Modifies TARGS and returns 0 on success. */
9121 resolve_overloaded_unification (tree tparms,
9125 unification_kind_t strict,
9128 tree tempargs = copy_node (targs);
9132 if (TREE_CODE (arg) == ADDR_EXPR)
9134 arg = TREE_OPERAND (arg, 0);
9140 if (TREE_CODE (arg) == COMPONENT_REF)
9141 /* Handle `&x' where `x' is some static or non-static member
9143 arg = TREE_OPERAND (arg, 1);
9145 if (TREE_CODE (arg) == OFFSET_REF)
9146 arg = TREE_OPERAND (arg, 1);
9148 /* Strip baselink information. */
9149 if (BASELINK_P (arg))
9150 arg = BASELINK_FUNCTIONS (arg);
9152 if (TREE_CODE (arg) == TEMPLATE_ID_EXPR)
9154 /* If we got some explicit template args, we need to plug them into
9155 the affected templates before we try to unify, in case the
9156 explicit args will completely resolve the templates in question. */
9158 tree expl_subargs = TREE_OPERAND (arg, 1);
9159 arg = TREE_OPERAND (arg, 0);
9161 for (; arg; arg = OVL_NEXT (arg))
9163 tree fn = OVL_CURRENT (arg);
9166 if (TREE_CODE (fn) != TEMPLATE_DECL)
9169 subargs = get_bindings_overload (fn, DECL_TEMPLATE_RESULT (fn),
9173 elem = tsubst (TREE_TYPE (fn), subargs, tf_none, NULL_TREE);
9174 good += try_one_overload (tparms, targs, tempargs, parm,
9175 elem, strict, sub_strict, addr_p);
9179 else if (TREE_CODE (arg) == OVERLOAD
9180 || TREE_CODE (arg) == FUNCTION_DECL)
9182 for (; arg; arg = OVL_NEXT (arg))
9183 good += try_one_overload (tparms, targs, tempargs, parm,
9184 TREE_TYPE (OVL_CURRENT (arg)),
9185 strict, sub_strict, addr_p);
9190 /* [temp.deduct.type] A template-argument can be deduced from a pointer
9191 to function or pointer to member function argument if the set of
9192 overloaded functions does not contain function templates and at most
9193 one of a set of overloaded functions provides a unique match.
9195 So if we found multiple possibilities, we return success but don't
9200 int i = TREE_VEC_LENGTH (targs);
9202 if (TREE_VEC_ELT (tempargs, i))
9203 TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i);
9211 /* Subroutine of resolve_overloaded_unification; does deduction for a single
9212 overload. Fills TARGS with any deduced arguments, or error_mark_node if
9213 different overloads deduce different arguments for a given parm.
9214 ADDR_P is true if the expression for which deduction is being
9215 performed was of the form "& fn" rather than simply "fn".
9217 Returns 1 on success. */
9220 try_one_overload (tree tparms,
9225 unification_kind_t strict,
9233 /* [temp.deduct.type] A template-argument can be deduced from a pointer
9234 to function or pointer to member function argument if the set of
9235 overloaded functions does not contain function templates and at most
9236 one of a set of overloaded functions provides a unique match.
9238 So if this is a template, just return success. */
9240 if (uses_template_parms (arg))
9243 if (TREE_CODE (arg) == METHOD_TYPE)
9244 arg = build_ptrmemfunc_type (build_pointer_type (arg));
9246 arg = build_pointer_type (arg);
9248 sub_strict |= maybe_adjust_types_for_deduction (strict, &parm, &arg);
9250 /* We don't copy orig_targs for this because if we have already deduced
9251 some template args from previous args, unify would complain when we
9252 try to deduce a template parameter for the same argument, even though
9253 there isn't really a conflict. */
9254 nargs = TREE_VEC_LENGTH (targs);
9255 tempargs = make_tree_vec (nargs);
9257 if (unify (tparms, tempargs, parm, arg, sub_strict) != 0)
9260 /* First make sure we didn't deduce anything that conflicts with
9261 explicitly specified args. */
9262 for (i = nargs; i--; )
9264 tree elt = TREE_VEC_ELT (tempargs, i);
9265 tree oldelt = TREE_VEC_ELT (orig_targs, i);
9267 if (elt == NULL_TREE)
9269 else if (uses_template_parms (elt))
9271 /* Since we're unifying against ourselves, we will fill in template
9272 args used in the function parm list with our own template parms.
9274 TREE_VEC_ELT (tempargs, i) = NULL_TREE;
9277 else if (oldelt && ! template_args_equal (oldelt, elt))
9281 for (i = nargs; i--; )
9283 tree elt = TREE_VEC_ELT (tempargs, i);
9286 TREE_VEC_ELT (targs, i) = elt;
9292 /* Verify that nondeduce template argument agrees with the type
9293 obtained from argument deduction. Return nonzero if the
9298 struct A { typedef int X; };
9299 template <class T, class U> struct C {};
9300 template <class T> struct C<T, typename T::X> {};
9302 Then with the instantiation `C<A, int>', we can deduce that
9303 `T' is `A' but unify () does not check whether `typename T::X'
9304 is `int'. This function ensure that they agree.
9306 TARGS, PARMS are the same as the arguments of unify.
9307 ARGS contains template arguments from all levels. */
9310 verify_class_unification (tree targs, tree parms, tree args)
9312 parms = tsubst (parms, add_outermost_template_args (args, targs),
9313 tf_none, NULL_TREE);
9314 if (parms == error_mark_node)
9317 return !comp_template_args (parms, INNERMOST_TEMPLATE_ARGS (args));
9320 /* PARM is a template class (perhaps with unbound template
9321 parameters). ARG is a fully instantiated type. If ARG can be
9322 bound to PARM, return ARG, otherwise return NULL_TREE. TPARMS and
9323 TARGS are as for unify. */
9326 try_class_unification (tree tparms, tree targs, tree parm, tree arg)
9330 if (!CLASSTYPE_TEMPLATE_INFO (arg)
9331 || (most_general_template (CLASSTYPE_TI_TEMPLATE (arg))
9332 != most_general_template (CLASSTYPE_TI_TEMPLATE (parm))))
9335 /* We need to make a new template argument vector for the call to
9336 unify. If we used TARGS, we'd clutter it up with the result of
9337 the attempted unification, even if this class didn't work out.
9338 We also don't want to commit ourselves to all the unifications
9339 we've already done, since unification is supposed to be done on
9340 an argument-by-argument basis. In other words, consider the
9341 following pathological case:
9343 template <int I, int J, int K>
9346 template <int I, int J>
9347 struct S<I, J, 2> : public S<I, I, I>, S<J, J, J> {};
9349 template <int I, int J, int K>
9350 void f(S<I, J, K>, S<I, I, I>);
9359 Now, by the time we consider the unification involving `s2', we
9360 already know that we must have `f<0, 0, 0>'. But, even though
9361 `S<0, 1, 2>' is derived from `S<0, 0, 0>', the code is invalid
9362 because there are two ways to unify base classes of S<0, 1, 2>
9363 with S<I, I, I>. If we kept the already deduced knowledge, we
9364 would reject the possibility I=1. */
9365 copy_of_targs = make_tree_vec (TREE_VEC_LENGTH (targs));
9367 /* If unification failed, we're done. */
9368 if (unify (tparms, copy_of_targs, CLASSTYPE_TI_ARGS (parm),
9369 CLASSTYPE_TI_ARGS (arg), UNIFY_ALLOW_NONE))
9375 /* Subroutine of get_template_base. RVAL, if non-NULL, is a base we
9376 have already discovered to be satisfactory. ARG_BINFO is the binfo
9377 for the base class of ARG that we are currently examining. */
9380 get_template_base_recursive (tree tparms,
9389 tree arg = BINFO_TYPE (arg_binfo);
9391 if (!(flags & GTB_IGNORE_TYPE))
9393 tree r = try_class_unification (tparms, targs,
9396 /* If there is more than one satisfactory baseclass, then:
9400 If they yield more than one possible deduced A, the type
9404 if (r && rval && !same_type_p (r, rval))
9405 return error_mark_node;
9410 binfos = BINFO_BASE_BINFOS (arg_binfo);
9411 n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
9413 /* Process base types. */
9414 for (i = 0; i < n_baselinks; i++)
9416 tree base_binfo = TREE_VEC_ELT (binfos, i);
9419 /* Skip this base, if we've already seen it. */
9420 if (BINFO_MARKED (base_binfo))
9424 (flags & GTB_VIA_VIRTUAL) || BINFO_VIRTUAL_P (base_binfo);
9426 /* When searching for a non-virtual, we cannot mark virtually
9429 BINFO_MARKED (base_binfo) = 1;
9431 rval = get_template_base_recursive (tparms, targs,
9435 GTB_VIA_VIRTUAL * this_virtual);
9437 /* If we discovered more than one matching base class, we can
9439 if (rval == error_mark_node)
9440 return error_mark_node;
9446 /* Given a template type PARM and a class type ARG, find the unique
9447 base type in ARG that is an instance of PARM. We do not examine
9448 ARG itself; only its base-classes. If there is no appropriate base
9449 class, return NULL_TREE. If there is more than one, return
9450 error_mark_node. PARM may be the type of a partial specialization,
9451 as well as a plain template type. Used by unify. */
9454 get_template_base (tree tparms, tree targs, tree parm, tree arg)
9459 my_friendly_assert (IS_AGGR_TYPE_CODE (TREE_CODE (arg)), 92);
9461 arg_binfo = TYPE_BINFO (complete_type (arg));
9462 rval = get_template_base_recursive (tparms, targs,
9467 /* Since get_template_base_recursive marks the bases classes, we
9468 must unmark them here. */
9469 dfs_walk (arg_binfo, dfs_unmark, markedp, 0);
9474 /* Returns the level of DECL, which declares a template parameter. */
9477 template_decl_level (tree decl)
9479 switch (TREE_CODE (decl))
9483 return TEMPLATE_TYPE_LEVEL (TREE_TYPE (decl));
9486 return TEMPLATE_PARM_LEVEL (DECL_INITIAL (decl));
9494 /* Decide whether ARG can be unified with PARM, considering only the
9495 cv-qualifiers of each type, given STRICT as documented for unify.
9496 Returns nonzero iff the unification is OK on that basis. */
9499 check_cv_quals_for_unify (int strict, tree arg, tree parm)
9501 int arg_quals = cp_type_quals (arg);
9502 int parm_quals = cp_type_quals (parm);
9504 if (TREE_CODE (parm) == TEMPLATE_TYPE_PARM
9505 && !(strict & UNIFY_ALLOW_OUTER_MORE_CV_QUAL))
9507 /* Although a CVR qualifier is ignored when being applied to a
9508 substituted template parameter ([8.3.2]/1 for example), that
9509 does not apply during deduction [14.8.2.4]/1, (even though
9510 that is not explicitly mentioned, [14.8.2.4]/9 indicates
9511 this). Except when we're allowing additional CV qualifiers
9512 at the outer level [14.8.2.1]/3,1st bullet. */
9513 if ((TREE_CODE (arg) == REFERENCE_TYPE
9514 || TREE_CODE (arg) == FUNCTION_TYPE
9515 || TREE_CODE (arg) == METHOD_TYPE)
9516 && (parm_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)))
9519 if ((!POINTER_TYPE_P (arg) && TREE_CODE (arg) != TEMPLATE_TYPE_PARM)
9520 && (parm_quals & TYPE_QUAL_RESTRICT))
9524 if (!(strict & (UNIFY_ALLOW_MORE_CV_QUAL | UNIFY_ALLOW_OUTER_MORE_CV_QUAL))
9525 && (arg_quals & parm_quals) != parm_quals)
9528 if (!(strict & (UNIFY_ALLOW_LESS_CV_QUAL | UNIFY_ALLOW_OUTER_LESS_CV_QUAL))
9529 && (parm_quals & arg_quals) != arg_quals)
9535 /* Takes parameters as for type_unification. Returns 0 if the
9536 type deduction succeeds, 1 otherwise. The parameter STRICT is a
9537 bitwise or of the following flags:
9540 Require an exact match between PARM and ARG.
9541 UNIFY_ALLOW_MORE_CV_QUAL:
9542 Allow the deduced ARG to be more cv-qualified (by qualification
9543 conversion) than ARG.
9544 UNIFY_ALLOW_LESS_CV_QUAL:
9545 Allow the deduced ARG to be less cv-qualified than ARG.
9546 UNIFY_ALLOW_DERIVED:
9547 Allow the deduced ARG to be a template base class of ARG,
9548 or a pointer to a template base class of the type pointed to by
9550 UNIFY_ALLOW_INTEGER:
9551 Allow any integral type to be deduced. See the TEMPLATE_PARM_INDEX
9552 case for more information.
9553 UNIFY_ALLOW_OUTER_LEVEL:
9554 This is the outermost level of a deduction. Used to determine validity
9555 of qualification conversions. A valid qualification conversion must
9556 have const qualified pointers leading up to the inner type which
9557 requires additional CV quals, except at the outer level, where const
9558 is not required [conv.qual]. It would be normal to set this flag in
9559 addition to setting UNIFY_ALLOW_MORE_CV_QUAL.
9560 UNIFY_ALLOW_OUTER_MORE_CV_QUAL:
9561 This is the outermost level of a deduction, and PARM can be more CV
9562 qualified at this point.
9563 UNIFY_ALLOW_OUTER_LESS_CV_QUAL:
9564 This is the outermost level of a deduction, and PARM can be less CV
9565 qualified at this point.
9566 UNIFY_ALLOW_MAX_CORRECTION:
9567 This is an INTEGER_TYPE's maximum value. Used if the range may
9568 have been derived from a size specification, such as an array size.
9569 If the size was given by a nontype template parameter N, the maximum
9570 value will have the form N-1. The flag says that we can (and indeed
9571 must) unify N with (ARG + 1), an exception to the normal rules on
9575 unify (tree tparms, tree targs, tree parm, tree arg, int strict)
9580 int strict_in = strict;
9582 /* I don't think this will do the right thing with respect to types.
9583 But the only case I've seen it in so far has been array bounds, where
9584 signedness is the only information lost, and I think that will be
9586 while (TREE_CODE (parm) == NOP_EXPR)
9587 parm = TREE_OPERAND (parm, 0);
9589 if (arg == error_mark_node)
9591 if (arg == unknown_type_node)
9592 /* We can't deduce anything from this, but we might get all the
9593 template args from other function args. */
9596 /* If PARM uses template parameters, then we can't bail out here,
9597 even if ARG == PARM, since we won't record unifications for the
9598 template parameters. We might need them if we're trying to
9599 figure out which of two things is more specialized. */
9600 if (arg == parm && !uses_template_parms (parm))
9603 /* Immediately reject some pairs that won't unify because of
9604 cv-qualification mismatches. */
9605 if (TREE_CODE (arg) == TREE_CODE (parm)
9607 /* It is the elements of the array which hold the cv quals of an array
9608 type, and the elements might be template type parms. We'll check
9610 && TREE_CODE (arg) != ARRAY_TYPE
9611 /* We check the cv-qualifiers when unifying with template type
9612 parameters below. We want to allow ARG `const T' to unify with
9613 PARM `T' for example, when computing which of two templates
9614 is more specialized, for example. */
9615 && TREE_CODE (arg) != TEMPLATE_TYPE_PARM
9616 && !check_cv_quals_for_unify (strict_in, arg, parm))
9619 if (!(strict & UNIFY_ALLOW_OUTER_LEVEL)
9620 && TYPE_P (parm) && !CP_TYPE_CONST_P (parm))
9621 strict &= ~UNIFY_ALLOW_MORE_CV_QUAL;
9622 strict &= ~UNIFY_ALLOW_OUTER_LEVEL;
9623 strict &= ~UNIFY_ALLOW_DERIVED;
9624 strict &= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL;
9625 strict &= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL;
9626 strict &= ~UNIFY_ALLOW_MAX_CORRECTION;
9628 switch (TREE_CODE (parm))
9632 case UNBOUND_CLASS_TEMPLATE:
9633 /* In a type which contains a nested-name-specifier, template
9634 argument values cannot be deduced for template parameters used
9635 within the nested-name-specifier. */
9638 case TEMPLATE_TYPE_PARM:
9639 case TEMPLATE_TEMPLATE_PARM:
9640 case BOUND_TEMPLATE_TEMPLATE_PARM:
9641 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0));
9643 if (TEMPLATE_TYPE_LEVEL (parm)
9644 != template_decl_level (tparm))
9645 /* The PARM is not one we're trying to unify. Just check
9646 to see if it matches ARG. */
9647 return (TREE_CODE (arg) == TREE_CODE (parm)
9648 && same_type_p (parm, arg)) ? 0 : 1;
9649 idx = TEMPLATE_TYPE_IDX (parm);
9650 targ = TREE_VEC_ELT (targs, idx);
9651 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, idx));
9653 /* Check for mixed types and values. */
9654 if ((TREE_CODE (parm) == TEMPLATE_TYPE_PARM
9655 && TREE_CODE (tparm) != TYPE_DECL)
9656 || (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM
9657 && TREE_CODE (tparm) != TEMPLATE_DECL))
9660 if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
9662 /* ARG must be constructed from a template class or a template
9663 template parameter. */
9664 if (TREE_CODE (arg) != BOUND_TEMPLATE_TEMPLATE_PARM
9665 && (TREE_CODE (arg) != RECORD_TYPE || !CLASSTYPE_TEMPLATE_INFO (arg)))
9669 tree parmtmpl = TYPE_TI_TEMPLATE (parm);
9670 tree parmvec = TYPE_TI_ARGS (parm);
9671 tree argvec = TYPE_TI_ARGS (arg);
9673 = DECL_INNERMOST_TEMPLATE_PARMS (TYPE_TI_TEMPLATE (arg));
9676 /* The parameter and argument roles have to be switched here
9677 in order to handle default arguments properly. For example,
9678 template<template <class> class TT> void f(TT<int>)
9679 should be able to accept vector<int> which comes from
9680 template <class T, class Allocator = allocator>
9683 if (coerce_template_parms (argtmplvec, parmvec, parmtmpl, 0, 1)
9687 /* Deduce arguments T, i from TT<T> or TT<i>.
9688 We check each element of PARMVEC and ARGVEC individually
9689 rather than the whole TREE_VEC since they can have
9690 different number of elements. */
9692 for (i = 0; i < TREE_VEC_LENGTH (parmvec); ++i)
9694 tree t = TREE_VEC_ELT (parmvec, i);
9696 if (unify (tparms, targs, t,
9697 TREE_VEC_ELT (argvec, i),
9702 arg = TYPE_TI_TEMPLATE (arg);
9704 /* Fall through to deduce template name. */
9707 if (TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM
9708 || TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
9710 /* Deduce template name TT from TT, TT<>, TT<T> and TT<i>. */
9712 /* Simple cases: Value already set, does match or doesn't. */
9713 if (targ != NULL_TREE && template_args_equal (targ, arg))
9720 /* If PARM is `const T' and ARG is only `int', we don't have
9721 a match unless we are allowing additional qualification.
9722 If ARG is `const int' and PARM is just `T' that's OK;
9723 that binds `const int' to `T'. */
9724 if (!check_cv_quals_for_unify (strict_in | UNIFY_ALLOW_LESS_CV_QUAL,
9728 /* Consider the case where ARG is `const volatile int' and
9729 PARM is `const T'. Then, T should be `volatile int'. */
9730 arg = cp_build_qualified_type_real
9731 (arg, cp_type_quals (arg) & ~cp_type_quals (parm), tf_none);
9732 if (arg == error_mark_node)
9735 /* Simple cases: Value already set, does match or doesn't. */
9736 if (targ != NULL_TREE && same_type_p (targ, arg))
9741 /* Make sure that ARG is not a variable-sized array. (Note
9742 that were talking about variable-sized arrays (like
9743 `int[n]'), rather than arrays of unknown size (like
9744 `int[]').) We'll get very confused by such a type since
9745 the bound of the array will not be computable in an
9746 instantiation. Besides, such types are not allowed in
9747 ISO C++, so we can do as we please here. */
9748 if (variably_modified_type_p (arg, NULL_TREE))
9752 TREE_VEC_ELT (targs, idx) = arg;
9755 case TEMPLATE_PARM_INDEX:
9756 tparm = TREE_VALUE (TREE_VEC_ELT (tparms, 0));
9758 if (TEMPLATE_PARM_LEVEL (parm)
9759 != template_decl_level (tparm))
9760 /* The PARM is not one we're trying to unify. Just check
9761 to see if it matches ARG. */
9762 return !(TREE_CODE (arg) == TREE_CODE (parm)
9763 && cp_tree_equal (parm, arg));
9765 idx = TEMPLATE_PARM_IDX (parm);
9766 targ = TREE_VEC_ELT (targs, idx);
9769 return !cp_tree_equal (targ, arg);
9771 /* [temp.deduct.type] If, in the declaration of a function template
9772 with a non-type template-parameter, the non-type
9773 template-parameter is used in an expression in the function
9774 parameter-list and, if the corresponding template-argument is
9775 deduced, the template-argument type shall match the type of the
9776 template-parameter exactly, except that a template-argument
9777 deduced from an array bound may be of any integral type.
9778 The non-type parameter might use already deduced type parameters. */
9779 tparm = tsubst (TREE_TYPE (parm), targs, 0, NULL_TREE);
9780 if (!TREE_TYPE (arg))
9781 /* Template-parameter dependent expression. Just accept it for now.
9782 It will later be processed in convert_template_argument. */
9784 else if (same_type_p (TREE_TYPE (arg), tparm))
9786 else if ((strict & UNIFY_ALLOW_INTEGER)
9787 && (TREE_CODE (tparm) == INTEGER_TYPE
9788 || TREE_CODE (tparm) == BOOLEAN_TYPE))
9790 else if (uses_template_parms (tparm))
9791 /* We haven't deduced the type of this parameter yet. Try again
9797 TREE_VEC_ELT (targs, idx) = arg;
9802 /* A pointer-to-member constant can be unified only with
9803 another constant. */
9804 if (TREE_CODE (arg) != PTRMEM_CST)
9807 /* Just unify the class member. It would be useless (and possibly
9808 wrong, depending on the strict flags) to unify also
9809 PTRMEM_CST_CLASS, because we want to be sure that both parm and
9810 arg refer to the same variable, even if through different
9811 classes. For instance:
9813 struct A { int x; };
9816 Unification of &A::x and &B::x must succeed. */
9817 return unify (tparms, targs, PTRMEM_CST_MEMBER (parm),
9818 PTRMEM_CST_MEMBER (arg), strict);
9823 if (TREE_CODE (arg) != POINTER_TYPE)
9826 /* [temp.deduct.call]
9828 A can be another pointer or pointer to member type that can
9829 be converted to the deduced A via a qualification
9830 conversion (_conv.qual_).
9832 We pass down STRICT here rather than UNIFY_ALLOW_NONE.
9833 This will allow for additional cv-qualification of the
9834 pointed-to types if appropriate. */
9836 if (TREE_CODE (TREE_TYPE (arg)) == RECORD_TYPE)
9837 /* The derived-to-base conversion only persists through one
9838 level of pointers. */
9839 strict |= (strict_in & UNIFY_ALLOW_DERIVED);
9841 return unify (tparms, targs, TREE_TYPE (parm),
9842 TREE_TYPE (arg), strict);
9845 case REFERENCE_TYPE:
9846 if (TREE_CODE (arg) != REFERENCE_TYPE)
9848 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
9849 strict & UNIFY_ALLOW_MORE_CV_QUAL);
9852 if (TREE_CODE (arg) != ARRAY_TYPE)
9854 if ((TYPE_DOMAIN (parm) == NULL_TREE)
9855 != (TYPE_DOMAIN (arg) == NULL_TREE))
9857 if (TYPE_DOMAIN (parm) != NULL_TREE
9858 && unify (tparms, targs, TYPE_DOMAIN (parm),
9859 TYPE_DOMAIN (arg), UNIFY_ALLOW_NONE) != 0)
9861 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
9862 strict & UNIFY_ALLOW_MORE_CV_QUAL);
9870 if (TREE_CODE (arg) != TREE_CODE (parm))
9873 if (TREE_CODE (parm) == INTEGER_TYPE
9874 && TREE_CODE (TYPE_MAX_VALUE (parm)) != INTEGER_CST)
9876 if (TYPE_MIN_VALUE (parm) && TYPE_MIN_VALUE (arg)
9877 && unify (tparms, targs, TYPE_MIN_VALUE (parm),
9878 TYPE_MIN_VALUE (arg), UNIFY_ALLOW_INTEGER))
9880 if (TYPE_MAX_VALUE (parm) && TYPE_MAX_VALUE (arg)
9881 && unify (tparms, targs, TYPE_MAX_VALUE (parm),
9882 TYPE_MAX_VALUE (arg),
9883 UNIFY_ALLOW_INTEGER | UNIFY_ALLOW_MAX_CORRECTION))
9886 /* We have already checked cv-qualification at the top of the
9888 else if (!same_type_ignoring_top_level_qualifiers_p (arg, parm))
9891 /* As far as unification is concerned, this wins. Later checks
9892 will invalidate it if necessary. */
9895 /* Types INTEGER_CST and MINUS_EXPR can come from array bounds. */
9896 /* Type INTEGER_CST can come from ordinary constant template args. */
9898 while (TREE_CODE (arg) == NOP_EXPR)
9899 arg = TREE_OPERAND (arg, 0);
9901 if (TREE_CODE (arg) != INTEGER_CST)
9903 return !tree_int_cst_equal (parm, arg);
9908 if (TREE_CODE (arg) != TREE_VEC)
9910 if (TREE_VEC_LENGTH (parm) != TREE_VEC_LENGTH (arg))
9912 for (i = 0; i < TREE_VEC_LENGTH (parm); ++i)
9913 if (unify (tparms, targs,
9914 TREE_VEC_ELT (parm, i), TREE_VEC_ELT (arg, i),
9922 if (TREE_CODE (arg) != TREE_CODE (parm))
9925 if (TYPE_PTRMEMFUNC_P (parm))
9927 if (!TYPE_PTRMEMFUNC_P (arg))
9930 return unify (tparms, targs,
9931 TYPE_PTRMEMFUNC_FN_TYPE (parm),
9932 TYPE_PTRMEMFUNC_FN_TYPE (arg),
9936 if (CLASSTYPE_TEMPLATE_INFO (parm))
9940 if (strict_in & UNIFY_ALLOW_DERIVED)
9942 /* First, we try to unify the PARM and ARG directly. */
9943 t = try_class_unification (tparms, targs,
9948 /* Fallback to the special case allowed in
9951 If P is a class, and P has the form
9952 template-id, then A can be a derived class of
9953 the deduced A. Likewise, if P is a pointer to
9954 a class of the form template-id, A can be a
9955 pointer to a derived class pointed to by the
9957 t = get_template_base (tparms, targs,
9960 if (! t || t == error_mark_node)
9964 else if (CLASSTYPE_TEMPLATE_INFO (arg)
9965 && (CLASSTYPE_TI_TEMPLATE (parm)
9966 == CLASSTYPE_TI_TEMPLATE (arg)))
9967 /* Perhaps PARM is something like S<U> and ARG is S<int>.
9968 Then, we should unify `int' and `U'. */
9971 /* There's no chance of unification succeeding. */
9974 return unify (tparms, targs, CLASSTYPE_TI_ARGS (parm),
9975 CLASSTYPE_TI_ARGS (t), UNIFY_ALLOW_NONE);
9977 else if (!same_type_ignoring_top_level_qualifiers_p (parm, arg))
9983 if (TREE_CODE (arg) != TREE_CODE (parm))
9986 if (unify (tparms, targs, TREE_TYPE (parm),
9987 TREE_TYPE (arg), UNIFY_ALLOW_NONE))
9989 return type_unification_real (tparms, targs, TYPE_ARG_TYPES (parm),
9990 TYPE_ARG_TYPES (arg), 1,
9991 DEDUCE_EXACT, 0, -1);
9994 if (TREE_CODE (arg) != OFFSET_TYPE)
9996 if (unify (tparms, targs, TYPE_OFFSET_BASETYPE (parm),
9997 TYPE_OFFSET_BASETYPE (arg), UNIFY_ALLOW_NONE))
9999 return unify (tparms, targs, TREE_TYPE (parm), TREE_TYPE (arg),
10003 if (DECL_TEMPLATE_PARM_P (parm))
10004 return unify (tparms, targs, DECL_INITIAL (parm), arg, strict);
10005 if (arg != decl_constant_value (parm))
10010 case TEMPLATE_DECL:
10011 /* Matched cases are handled by the ARG == PARM test above. */
10015 if (tree_int_cst_equal (TREE_OPERAND (parm, 1), integer_one_node)
10016 && (strict_in & UNIFY_ALLOW_MAX_CORRECTION))
10018 /* We handle this case specially, since it comes up with
10019 arrays. In particular, something like:
10021 template <int N> void f(int (&x)[N]);
10023 Here, we are trying to unify the range type, which
10024 looks like [0 ... (N - 1)]. */
10026 t1 = TREE_OPERAND (parm, 0);
10027 t2 = TREE_OPERAND (parm, 1);
10029 t = fold (build (PLUS_EXPR, integer_type_node, arg, t2));
10031 return unify (tparms, targs, t1, t, strict);
10033 /* Else fall through. */
10036 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (parm))))
10039 /* We're looking at an expression. This can happen with
10043 void foo(S<I>, S<I + 2>);
10045 This is a "nondeduced context":
10049 The nondeduced contexts are:
10051 --A type that is a template-id in which one or more of
10052 the template-arguments is an expression that references
10053 a template-parameter.
10055 In these cases, we assume deduction succeeded, but don't
10056 actually infer any unifications. */
10058 if (!uses_template_parms (parm)
10059 && !template_args_equal (parm, arg))
10065 sorry ("use of `%s' in template type unification",
10066 tree_code_name [(int) TREE_CODE (parm)]);
10072 /* Called if RESULT is explicitly instantiated, or is a member of an
10073 explicitly instantiated class, or if using -frepo and the
10074 instantiation of RESULT has been assigned to this file. */
10077 mark_decl_instantiated (tree result, int extern_p)
10079 SET_DECL_EXPLICIT_INSTANTIATION (result);
10081 /* If this entity has already been written out, it's too late to
10082 make any modifications. */
10083 if (TREE_ASM_WRITTEN (result))
10086 if (TREE_CODE (result) != FUNCTION_DECL)
10087 /* The TREE_PUBLIC flag for function declarations will have been
10088 set correctly by tsubst. */
10089 TREE_PUBLIC (result) = 1;
10091 /* This might have been set by an earlier implicit instantiation. */
10092 DECL_COMDAT (result) = 0;
10096 DECL_INTERFACE_KNOWN (result) = 1;
10097 DECL_NOT_REALLY_EXTERN (result) = 1;
10099 /* Always make artificials weak. */
10100 if (DECL_ARTIFICIAL (result) && flag_weak)
10101 comdat_linkage (result);
10102 /* For WIN32 we also want to put explicit instantiations in
10103 linkonce sections. */
10104 else if (TREE_PUBLIC (result))
10105 maybe_make_one_only (result);
10109 /* Given two function templates PAT1 and PAT2, return:
10111 DEDUCE should be DEDUCE_EXACT or DEDUCE_ORDER.
10113 1 if PAT1 is more specialized than PAT2 as described in [temp.func.order].
10114 -1 if PAT2 is more specialized than PAT1.
10115 0 if neither is more specialized.
10117 LEN is passed through to fn_type_unification. */
10120 more_specialized (tree pat1, tree pat2, int deduce, int len)
10125 /* If template argument deduction succeeds, we substitute the
10126 resulting arguments into non-deduced contexts. While doing that,
10127 we must be aware that we may encounter dependent types. */
10128 ++processing_template_decl;
10129 targs = get_bindings_real (pat1, DECL_TEMPLATE_RESULT (pat2),
10130 NULL_TREE, 0, deduce, len);
10134 targs = get_bindings_real (pat2, DECL_TEMPLATE_RESULT (pat1),
10135 NULL_TREE, 0, deduce, len);
10138 --processing_template_decl;
10143 /* Given two class template specialization list nodes PAT1 and PAT2, return:
10145 1 if PAT1 is more specialized than PAT2 as described in [temp.class.order].
10146 -1 if PAT2 is more specialized than PAT1.
10147 0 if neither is more specialized.
10149 FULL_ARGS is the full set of template arguments that triggers this
10150 partial ordering. */
10153 more_specialized_class (tree pat1, tree pat2, tree full_args)
10158 /* Just like what happens for functions, if we are ordering between
10159 different class template specializations, we may encounter dependent
10160 types in the arguments, and we need our dependency check functions
10161 to behave correctly. */
10162 ++processing_template_decl;
10163 targs = get_class_bindings (TREE_VALUE (pat1), TREE_PURPOSE (pat1),
10164 add_outermost_template_args (full_args, TREE_PURPOSE (pat2)));
10168 targs = get_class_bindings (TREE_VALUE (pat2), TREE_PURPOSE (pat2),
10169 add_outermost_template_args (full_args, TREE_PURPOSE (pat1)));
10172 --processing_template_decl;
10177 /* Return the template arguments that will produce the function signature
10178 DECL from the function template FN, with the explicit template
10179 arguments EXPLICIT_ARGS. If CHECK_RETTYPE is 1, the return type must
10180 also match. Return NULL_TREE if no satisfactory arguments could be
10181 found. DEDUCE and LEN are passed through to fn_type_unification. */
10184 get_bindings_real (tree fn,
10186 tree explicit_args,
10191 int ntparms = DECL_NTPARMS (fn);
10192 tree targs = make_tree_vec (ntparms);
10194 tree decl_arg_types;
10197 /* Substitute the explicit template arguments into the type of DECL.
10198 The call to fn_type_unification will handle substitution into the
10200 decl_type = TREE_TYPE (decl);
10201 if (explicit_args && uses_template_parms (decl_type))
10204 tree converted_args;
10206 if (DECL_TEMPLATE_INFO (decl))
10207 tmpl = DECL_TI_TEMPLATE (decl);
10209 /* We can get here for some invalid specializations. */
10213 = (coerce_template_parms (DECL_INNERMOST_TEMPLATE_PARMS (tmpl),
10214 explicit_args, NULL_TREE,
10215 tf_none, /*require_all_arguments=*/0));
10216 if (converted_args == error_mark_node)
10219 decl_type = tsubst (decl_type, converted_args, tf_none, NULL_TREE);
10220 if (decl_type == error_mark_node)
10224 decl_arg_types = TYPE_ARG_TYPES (decl_type);
10225 /* Never do unification on the 'this' parameter. */
10226 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10227 decl_arg_types = TREE_CHAIN (decl_arg_types);
10229 i = fn_type_unification (fn, explicit_args, targs,
10231 (check_rettype || DECL_CONV_FN_P (fn)
10232 ? TREE_TYPE (decl_type) : NULL_TREE),
10241 /* For most uses, we want to check the return type. */
10244 get_bindings (tree fn, tree decl, tree explicit_args)
10246 return get_bindings_real (fn, decl, explicit_args, 1, DEDUCE_EXACT, -1);
10249 /* But for resolve_overloaded_unification, we only care about the parameter
10253 get_bindings_overload (tree fn, tree decl, tree explicit_args)
10255 return get_bindings_real (fn, decl, explicit_args, 0, DEDUCE_EXACT, -1);
10258 /* Return the innermost template arguments that, when applied to a
10259 template specialization whose innermost template parameters are
10260 TPARMS, and whose specialization arguments are PARMS, yield the
10263 For example, suppose we have:
10265 template <class T, class U> struct S {};
10266 template <class T> struct S<T*, int> {};
10268 Then, suppose we want to get `S<double*, int>'. The TPARMS will be
10269 {T}, the PARMS will be {T*, int} and the ARGS will be {double*,
10270 int}. The resulting vector will be {double}, indicating that `T'
10271 is bound to `double'. */
10274 get_class_bindings (tree tparms, tree parms, tree args)
10276 int i, ntparms = TREE_VEC_LENGTH (tparms);
10277 tree vec = make_tree_vec (ntparms);
10279 if (unify (tparms, vec, parms, INNERMOST_TEMPLATE_ARGS (args),
10283 for (i = 0; i < ntparms; ++i)
10284 if (! TREE_VEC_ELT (vec, i))
10287 if (verify_class_unification (vec, parms, args))
10293 /* In INSTANTIATIONS is a list of <INSTANTIATION, TEMPLATE> pairs.
10294 Pick the most specialized template, and return the corresponding
10295 instantiation, or if there is no corresponding instantiation, the
10296 template itself. If there is no most specialized template,
10297 error_mark_node is returned. If there are no templates at all,
10298 NULL_TREE is returned. */
10301 most_specialized_instantiation (tree instantiations)
10306 if (!instantiations)
10309 champ = instantiations;
10310 for (fn = TREE_CHAIN (instantiations); fn; fn = TREE_CHAIN (fn))
10312 fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn),
10320 fn = TREE_CHAIN (fn);
10322 return error_mark_node;
10328 for (fn = instantiations; fn && fn != champ; fn = TREE_CHAIN (fn))
10330 fate = more_specialized (TREE_VALUE (champ), TREE_VALUE (fn),
10333 return error_mark_node;
10336 return TREE_PURPOSE (champ) ? TREE_PURPOSE (champ) : TREE_VALUE (champ);
10339 /* Return the most specialized of the list of templates in FNS that can
10340 produce an instantiation matching DECL, given the explicit template
10341 arguments EXPLICIT_ARGS. */
10344 most_specialized (tree fns, tree decl, tree explicit_args)
10346 tree candidates = NULL_TREE;
10349 for (fn = fns; fn; fn = TREE_CHAIN (fn))
10351 tree candidate = TREE_VALUE (fn);
10353 args = get_bindings (candidate, decl, explicit_args);
10355 candidates = tree_cons (NULL_TREE, candidate, candidates);
10358 return most_specialized_instantiation (candidates);
10361 /* If DECL is a specialization of some template, return the most
10362 general such template. Otherwise, returns NULL_TREE.
10364 For example, given:
10366 template <class T> struct S { template <class U> void f(U); };
10368 if TMPL is `template <class U> void S<int>::f(U)' this will return
10369 the full template. This function will not trace past partial
10370 specializations, however. For example, given in addition:
10372 template <class T> struct S<T*> { template <class U> void f(U); };
10374 if TMPL is `template <class U> void S<int*>::f(U)' this will return
10375 `template <class T> template <class U> S<T*>::f(U)'. */
10378 most_general_template (tree decl)
10380 /* If DECL is a FUNCTION_DECL, find the TEMPLATE_DECL of which it is
10381 an immediate specialization. */
10382 if (TREE_CODE (decl) == FUNCTION_DECL)
10384 if (DECL_TEMPLATE_INFO (decl)) {
10385 decl = DECL_TI_TEMPLATE (decl);
10387 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE for a
10388 template friend. */
10389 if (TREE_CODE (decl) != TEMPLATE_DECL)
10395 /* Look for more and more general templates. */
10396 while (DECL_TEMPLATE_INFO (decl))
10398 /* The DECL_TI_TEMPLATE can be an IDENTIFIER_NODE in some cases.
10399 (See cp-tree.h for details.) */
10400 if (TREE_CODE (DECL_TI_TEMPLATE (decl)) != TEMPLATE_DECL)
10403 if (CLASS_TYPE_P (TREE_TYPE (decl))
10404 && CLASSTYPE_TEMPLATE_SPECIALIZATION (TREE_TYPE (decl)))
10407 /* Stop if we run into an explicitly specialized class template. */
10408 if (!DECL_NAMESPACE_SCOPE_P (decl)
10409 && DECL_CONTEXT (decl)
10410 && CLASSTYPE_TEMPLATE_SPECIALIZATION (DECL_CONTEXT (decl)))
10413 decl = DECL_TI_TEMPLATE (decl);
10419 /* Return the most specialized of the class template specializations
10420 of TMPL which can produce an instantiation matching ARGS, or
10421 error_mark_node if the choice is ambiguous. */
10424 most_specialized_class (tree tmpl, tree args)
10426 tree list = NULL_TREE;
10431 tmpl = most_general_template (tmpl);
10432 for (t = DECL_TEMPLATE_SPECIALIZATIONS (tmpl); t; t = TREE_CHAIN (t))
10435 = get_class_bindings (TREE_VALUE (t), TREE_PURPOSE (t), args);
10438 list = tree_cons (TREE_PURPOSE (t), TREE_VALUE (t), list);
10439 TREE_TYPE (list) = TREE_TYPE (t);
10448 t = TREE_CHAIN (t);
10449 for (; t; t = TREE_CHAIN (t))
10451 fate = more_specialized_class (champ, t, args);
10458 t = TREE_CHAIN (t);
10460 return error_mark_node;
10466 for (t = list; t && t != champ; t = TREE_CHAIN (t))
10468 fate = more_specialized_class (champ, t, args);
10470 return error_mark_node;
10476 /* Explicitly instantiate DECL. */
10479 do_decl_instantiation (tree decl, tree storage)
10481 tree result = NULL_TREE;
10485 /* An error occurred, for which grokdeclarator has already issued
10486 an appropriate message. */
10488 else if (! DECL_LANG_SPECIFIC (decl))
10490 error ("explicit instantiation of non-template `%#D'", decl);
10493 else if (TREE_CODE (decl) == VAR_DECL)
10495 /* There is an asymmetry here in the way VAR_DECLs and
10496 FUNCTION_DECLs are handled by grokdeclarator. In the case of
10497 the latter, the DECL we get back will be marked as a
10498 template instantiation, and the appropriate
10499 DECL_TEMPLATE_INFO will be set up. This does not happen for
10500 VAR_DECLs so we do the lookup here. Probably, grokdeclarator
10501 should handle VAR_DECLs as it currently handles
10503 result = lookup_field (DECL_CONTEXT (decl), DECL_NAME (decl), 0, false);
10504 if (!result || TREE_CODE (result) != VAR_DECL)
10506 error ("no matching template for `%D' found", decl);
10510 else if (TREE_CODE (decl) != FUNCTION_DECL)
10512 error ("explicit instantiation of `%#D'", decl);
10518 /* Check for various error cases. Note that if the explicit
10519 instantiation is valid the RESULT will currently be marked as an
10520 *implicit* instantiation; DECL_EXPLICIT_INSTANTIATION is not set
10521 until we get here. */
10523 if (DECL_TEMPLATE_SPECIALIZATION (result))
10525 /* DR 259 [temp.spec].
10527 Both an explicit instantiation and a declaration of an explicit
10528 specialization shall not appear in a program unless the explicit
10529 instantiation follows a declaration of the explicit specialization.
10531 For a given set of template parameters, if an explicit
10532 instantiation of a template appears after a declaration of an
10533 explicit specialization for that template, the explicit
10534 instantiation has no effect. */
10537 else if (DECL_EXPLICIT_INSTANTIATION (result))
10541 No program shall explicitly instantiate any template more
10544 We check DECL_INTERFACE_KNOWN so as not to complain when the first
10545 instantiation was `extern' and the second is not, and EXTERN_P for
10546 the opposite case. If -frepo, chances are we already got marked
10547 as an explicit instantiation because of the repo file. */
10548 if (DECL_INTERFACE_KNOWN (result) && !extern_p && !flag_use_repository)
10549 pedwarn ("duplicate explicit instantiation of `%#D'", result);
10551 /* If we've already instantiated the template, just return now. */
10552 if (DECL_INTERFACE_KNOWN (result))
10555 else if (!DECL_IMPLICIT_INSTANTIATION (result))
10557 error ("no matching template for `%D' found", result);
10560 else if (!DECL_TEMPLATE_INFO (result))
10562 pedwarn ("explicit instantiation of non-template `%#D'", result);
10566 if (storage == NULL_TREE)
10568 else if (storage == ridpointers[(int) RID_EXTERN])
10570 if (pedantic && !in_system_header)
10571 pedwarn ("ISO C++ forbids the use of `extern' on explicit instantiations");
10575 error ("storage class `%D' applied to template instantiation",
10578 mark_decl_instantiated (result, extern_p);
10579 repo_template_instantiated (result, extern_p);
10581 instantiate_decl (result, /*defer_ok=*/1, /*undefined_ok=*/0);
10585 mark_class_instantiated (tree t, int extern_p)
10587 SET_CLASSTYPE_EXPLICIT_INSTANTIATION (t);
10588 SET_CLASSTYPE_INTERFACE_KNOWN (t);
10589 CLASSTYPE_INTERFACE_ONLY (t) = extern_p;
10590 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (t)) = extern_p;
10593 CLASSTYPE_DEBUG_REQUESTED (t) = 1;
10594 rest_of_type_compilation (t, 1);
10598 /* Called from do_type_instantiation through binding_table_foreach to
10599 do recursive instantiation for the type bound in ENTRY. */
10601 bt_instantiate_type_proc (binding_entry entry, void *data)
10603 tree storage = *(tree *) data;
10605 if (IS_AGGR_TYPE (entry->type)
10606 && !uses_template_parms (CLASSTYPE_TI_ARGS (entry->type)))
10607 do_type_instantiation (TYPE_MAIN_DECL (entry->type), storage, 0);
10610 /* Called from do_type_instantiation to instantiate a member
10611 (a member function or a static member variable) of an
10612 explicitly instantiated class template. */
10614 instantiate_class_member (tree decl, int extern_p)
10616 mark_decl_instantiated (decl, extern_p);
10617 repo_template_instantiated (decl, extern_p);
10619 instantiate_decl (decl, /*defer_ok=*/1, /* undefined_ok=*/1);
10622 /* Perform an explicit instantiation of template class T. STORAGE, if
10623 non-null, is the RID for extern, inline or static. COMPLAIN is
10624 nonzero if this is called from the parser, zero if called recursively,
10625 since the standard is unclear (as detailed below). */
10628 do_type_instantiation (tree t, tree storage, tsubst_flags_t complain)
10633 int previous_instantiation_extern_p = 0;
10635 if (TREE_CODE (t) == TYPE_DECL)
10638 if (! CLASS_TYPE_P (t) || ! CLASSTYPE_TEMPLATE_INFO (t))
10640 error ("explicit instantiation of non-template type `%T'", t);
10646 if (!COMPLETE_TYPE_P (t))
10648 if (complain & tf_error)
10649 error ("explicit instantiation of `%#T' before definition of template",
10654 if (storage != NULL_TREE)
10656 if (pedantic && !in_system_header)
10657 pedwarn("ISO C++ forbids the use of `%E' on explicit instantiations",
10660 if (storage == ridpointers[(int) RID_INLINE])
10662 else if (storage == ridpointers[(int) RID_EXTERN])
10664 else if (storage == ridpointers[(int) RID_STATIC])
10668 error ("storage class `%D' applied to template instantiation",
10674 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t))
10676 /* DR 259 [temp.spec].
10678 Both an explicit instantiation and a declaration of an explicit
10679 specialization shall not appear in a program unless the explicit
10680 instantiation follows a declaration of the explicit specialization.
10682 For a given set of template parameters, if an explicit
10683 instantiation of a template appears after a declaration of an
10684 explicit specialization for that template, the explicit
10685 instantiation has no effect. */
10688 else if (CLASSTYPE_EXPLICIT_INSTANTIATION (t))
10692 No program shall explicitly instantiate any template more
10695 If PREVIOUS_INSTANTIATION_EXTERN_P, then the first explicit
10696 instantiation was `extern'. If EXTERN_P then the second is.
10697 If -frepo, chances are we already got marked as an explicit
10698 instantiation because of the repo file. All these cases are
10701 previous_instantiation_extern_p = CLASSTYPE_INTERFACE_ONLY (t);
10703 if (!previous_instantiation_extern_p && !extern_p
10704 && !flag_use_repository
10705 && (complain & tf_error))
10706 pedwarn ("duplicate explicit instantiation of `%#T'", t);
10708 /* If we've already instantiated the template, just return now. */
10709 if (!CLASSTYPE_INTERFACE_ONLY (t))
10713 mark_class_instantiated (t, extern_p);
10714 repo_template_instantiated (t, extern_p);
10722 /* In contrast to implicit instantiation, where only the
10723 declarations, and not the definitions, of members are
10724 instantiated, we have here:
10728 The explicit instantiation of a class template specialization
10729 implies the instantiation of all of its members not
10730 previously explicitly specialized in the translation unit
10731 containing the explicit instantiation.
10733 Of course, we can't instantiate member template classes, since
10734 we don't have any arguments for them. Note that the standard
10735 is unclear on whether the instantiation of the members are
10736 *explicit* instantiations or not. However, the most natural
10737 interpretation is that it should be an explicit instantiation. */
10740 for (tmp = TYPE_METHODS (t); tmp; tmp = TREE_CHAIN (tmp))
10741 if (TREE_CODE (tmp) == FUNCTION_DECL
10742 && DECL_TEMPLATE_INSTANTIATION (tmp))
10743 instantiate_class_member (tmp, extern_p);
10745 for (tmp = TYPE_FIELDS (t); tmp; tmp = TREE_CHAIN (tmp))
10746 if (TREE_CODE (tmp) == VAR_DECL && DECL_TEMPLATE_INSTANTIATION (tmp))
10747 instantiate_class_member (tmp, extern_p);
10749 if (CLASSTYPE_NESTED_UTDS (t))
10750 binding_table_foreach (CLASSTYPE_NESTED_UTDS (t),
10751 bt_instantiate_type_proc, &storage);
10755 /* Given a function DECL, which is a specialization of TMPL, modify
10756 DECL to be a re-instantiation of TMPL with the same template
10757 arguments. TMPL should be the template into which tsubst'ing
10758 should occur for DECL, not the most general template.
10760 One reason for doing this is a scenario like this:
10763 void f(const T&, int i);
10765 void g() { f(3, 7); }
10768 void f(const T& t, const int i) { }
10770 Note that when the template is first instantiated, with
10771 instantiate_template, the resulting DECL will have no name for the
10772 first parameter, and the wrong type for the second. So, when we go
10773 to instantiate the DECL, we regenerate it. */
10776 regenerate_decl_from_template (tree decl, tree tmpl)
10778 /* The most general version of TMPL. */
10780 /* The arguments used to instantiate DECL, from the most general
10787 args = DECL_TI_ARGS (decl);
10788 code_pattern = DECL_TEMPLATE_RESULT (tmpl);
10790 /* Unregister the specialization so that when we tsubst we will not
10791 just return DECL. We don't have to unregister DECL from TMPL
10792 because if would only be registered there if it were a partial
10793 instantiation of a specialization, which it isn't: it's a full
10795 gen_tmpl = most_general_template (tmpl);
10796 unregistered = reregister_specialization (decl, gen_tmpl,
10797 /*new_spec=*/NULL_TREE);
10799 /* If the DECL was not unregistered then something peculiar is
10800 happening: we created a specialization but did not call
10801 register_specialization for it. */
10802 my_friendly_assert (unregistered, 0);
10804 /* Make sure that we can see identifiers, and compute access
10806 push_access_scope (decl);
10808 /* Do the substitution to get the new declaration. */
10809 new_decl = tsubst (code_pattern, args, tf_error, NULL_TREE);
10811 if (TREE_CODE (decl) == VAR_DECL)
10813 /* Set up DECL_INITIAL, since tsubst doesn't. */
10814 if (!DECL_INITIALIZED_IN_CLASS_P (decl))
10815 DECL_INITIAL (new_decl) =
10816 tsubst_expr (DECL_INITIAL (code_pattern), args,
10817 tf_error, DECL_TI_TEMPLATE (decl));
10819 else if (TREE_CODE (decl) == FUNCTION_DECL)
10821 /* Convince duplicate_decls to use the DECL_ARGUMENTS from the
10823 DECL_INITIAL (new_decl) = error_mark_node;
10824 /* And don't complain about a duplicate definition. */
10825 DECL_INITIAL (decl) = NULL_TREE;
10828 pop_access_scope (decl);
10830 /* The immediate parent of the new template is still whatever it was
10831 before, even though tsubst sets DECL_TI_TEMPLATE up as the most
10832 general template. We also reset the DECL_ASSEMBLER_NAME since
10833 tsubst always calculates the name as if the function in question
10834 were really a template instance, and sometimes, with friend
10835 functions, this is not so. See tsubst_friend_function for
10837 DECL_TI_TEMPLATE (new_decl) = DECL_TI_TEMPLATE (decl);
10838 COPY_DECL_ASSEMBLER_NAME (decl, new_decl);
10839 COPY_DECL_RTL (decl, new_decl);
10840 DECL_USE_TEMPLATE (new_decl) = DECL_USE_TEMPLATE (decl);
10842 /* Call duplicate decls to merge the old and new declarations. */
10843 duplicate_decls (new_decl, decl);
10845 /* Now, re-register the specialization. */
10846 register_specialization (decl, gen_tmpl, args);
10849 /* Return the TEMPLATE_DECL into which DECL_TI_ARGS(DECL) should be
10850 substituted to get DECL. */
10853 template_for_substitution (tree decl)
10855 tree tmpl = DECL_TI_TEMPLATE (decl);
10857 /* Set TMPL to the template whose DECL_TEMPLATE_RESULT is the pattern
10858 for the instantiation. This is not always the most general
10859 template. Consider, for example:
10862 struct S { template <class U> void f();
10863 template <> void f<int>(); };
10865 and an instantiation of S<double>::f<int>. We want TD to be the
10866 specialization S<T>::f<int>, not the more general S<T>::f<U>. */
10867 while (/* An instantiation cannot have a definition, so we need a
10868 more general template. */
10869 DECL_TEMPLATE_INSTANTIATION (tmpl)
10870 /* We must also deal with friend templates. Given:
10872 template <class T> struct S {
10873 template <class U> friend void f() {};
10876 S<int>::f<U> say, is not an instantiation of S<T>::f<U>,
10877 so far as the language is concerned, but that's still
10878 where we get the pattern for the instantiation from. On
10879 other hand, if the definition comes outside the class, say:
10881 template <class T> struct S {
10882 template <class U> friend void f();
10884 template <class U> friend void f() {}
10886 we don't need to look any further. That's what the check for
10887 DECL_INITIAL is for. */
10888 || (TREE_CODE (decl) == FUNCTION_DECL
10889 && DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (tmpl)
10890 && !DECL_INITIAL (DECL_TEMPLATE_RESULT (tmpl))))
10892 /* The present template, TD, should not be a definition. If it
10893 were a definition, we should be using it! Note that we
10894 cannot restructure the loop to just keep going until we find
10895 a template with a definition, since that might go too far if
10896 a specialization was declared, but not defined. */
10897 my_friendly_assert (!(TREE_CODE (decl) == VAR_DECL
10898 && !DECL_IN_AGGR_P (DECL_TEMPLATE_RESULT (tmpl))),
10901 /* Fetch the more general template. */
10902 tmpl = DECL_TI_TEMPLATE (tmpl);
10908 /* Produce the definition of D, a _DECL generated from a template. If
10909 DEFER_OK is nonzero, then we don't have to actually do the
10910 instantiation now; we just have to do it sometime. Normally it is
10911 an error if this is an explicit instantiation but D is undefined.
10912 If UNDEFINED_OK is nonzero, then instead we treat it as an implicit
10913 instantiation. UNDEFINED_OK is nonzero only if we are being used
10914 to instantiate the members of an explicitly instantiated class
10919 instantiate_decl (tree d, int defer_ok, int undefined_ok)
10921 tree tmpl = DECL_TI_TEMPLATE (d);
10928 int pattern_defined;
10930 location_t saved_loc = input_location;
10932 /* This function should only be used to instantiate templates for
10933 functions and static member variables. */
10934 my_friendly_assert (TREE_CODE (d) == FUNCTION_DECL
10935 || TREE_CODE (d) == VAR_DECL, 0);
10937 /* Variables are never deferred; if instantiation is required, they
10938 are instantiated right away. That allows for better code in the
10939 case that an expression refers to the value of the variable --
10940 if the variable has a constant value the referring expression can
10941 take advantage of that fact. */
10942 if (TREE_CODE (d) == VAR_DECL)
10945 /* Don't instantiate cloned functions. Instead, instantiate the
10946 functions they cloned. */
10947 if (TREE_CODE (d) == FUNCTION_DECL && DECL_CLONED_FUNCTION_P (d))
10948 d = DECL_CLONED_FUNCTION (d);
10950 if (DECL_TEMPLATE_INSTANTIATED (d))
10951 /* D has already been instantiated. It might seem reasonable to
10952 check whether or not D is an explicit instantiation, and, if so,
10953 stop here. But when an explicit instantiation is deferred
10954 until the end of the compilation, DECL_EXPLICIT_INSTANTIATION
10955 is set, even though we still need to do the instantiation. */
10958 /* If we already have a specialization of this declaration, then
10959 there's no reason to instantiate it. Note that
10960 retrieve_specialization gives us both instantiations and
10961 specializations, so we must explicitly check
10962 DECL_TEMPLATE_SPECIALIZATION. */
10963 gen_tmpl = most_general_template (tmpl);
10964 gen_args = DECL_TI_ARGS (d);
10965 spec = retrieve_specialization (gen_tmpl, gen_args);
10966 if (spec != NULL_TREE && DECL_TEMPLATE_SPECIALIZATION (spec))
10969 /* This needs to happen before any tsubsting. */
10970 if (! push_tinst_level (d))
10973 timevar_push (TV_PARSE);
10975 /* We may be in the middle of deferred access check. Disable it now. */
10976 push_deferring_access_checks (dk_no_deferred);
10978 /* Set TD to the template whose DECL_TEMPLATE_RESULT is the pattern
10979 for the instantiation. */
10980 td = template_for_substitution (d);
10981 code_pattern = DECL_TEMPLATE_RESULT (td);
10983 if ((DECL_NAMESPACE_SCOPE_P (d) && !DECL_INITIALIZED_IN_CLASS_P (d))
10984 || DECL_TEMPLATE_SPECIALIZATION (td))
10985 /* In the case of a friend template whose definition is provided
10986 outside the class, we may have too many arguments. Drop the
10987 ones we don't need. The same is true for specializations. */
10988 args = get_innermost_template_args
10989 (gen_args, TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (td)));
10993 if (TREE_CODE (d) == FUNCTION_DECL)
10994 pattern_defined = (DECL_SAVED_TREE (code_pattern) != NULL_TREE);
10996 pattern_defined = ! DECL_IN_AGGR_P (code_pattern);
10998 input_location = DECL_SOURCE_LOCATION (d);
11000 if (pattern_defined)
11002 /* Let the repository code that this template definition is
11005 The repository doesn't need to know about cloned functions
11006 because they never actually show up in the object file. It
11007 does need to know about the clones; those are the symbols
11008 that the linker will be emitting error messages about. */
11009 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (d)
11010 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (d))
11014 for (t = TREE_CHAIN (d);
11015 t && DECL_CLONED_FUNCTION_P (t);
11016 t = TREE_CHAIN (t))
11017 repo_template_used (t);
11020 repo_template_used (d);
11023 import_export_decl (d);
11026 if (! pattern_defined && DECL_EXPLICIT_INSTANTIATION (d) && undefined_ok)
11027 SET_DECL_IMPLICIT_INSTANTIATION (d);
11031 /* Recheck the substitutions to obtain any warning messages
11032 about ignoring cv qualifiers. */
11033 tree gen = DECL_TEMPLATE_RESULT (gen_tmpl);
11034 tree type = TREE_TYPE (gen);
11036 /* Make sure that we can see identifiers, and compute access
11037 correctly. D is already the target FUNCTION_DECL with the
11039 push_access_scope (d);
11041 if (TREE_CODE (gen) == FUNCTION_DECL)
11043 tsubst (DECL_ARGUMENTS (gen), gen_args, tf_error | tf_warning, d);
11044 tsubst (TYPE_RAISES_EXCEPTIONS (type), gen_args,
11045 tf_error | tf_warning, d);
11046 /* Don't simply tsubst the function type, as that will give
11047 duplicate warnings about poor parameter qualifications.
11048 The function arguments are the same as the decl_arguments
11049 without the top level cv qualifiers. */
11050 type = TREE_TYPE (type);
11052 tsubst (type, gen_args, tf_error | tf_warning, d);
11054 pop_access_scope (d);
11057 if (TREE_CODE (d) == VAR_DECL && DECL_INITIALIZED_IN_CLASS_P (d)
11058 && DECL_INITIAL (d) == NULL_TREE)
11059 /* We should have set up DECL_INITIAL in instantiate_class_template. */
11061 /* Reject all external templates except inline functions. */
11062 else if (DECL_INTERFACE_KNOWN (d)
11063 && ! DECL_NOT_REALLY_EXTERN (d)
11064 && ! (TREE_CODE (d) == FUNCTION_DECL
11065 && DECL_INLINE (d)))
11067 /* Defer all other templates, unless we have been explicitly
11068 forbidden from doing so. We restore the source position here
11069 because it's used by add_pending_template. */
11070 else if (! pattern_defined || defer_ok)
11072 input_location = saved_loc;
11074 if (at_eof && !pattern_defined
11075 && DECL_EXPLICIT_INSTANTIATION (d))
11078 The definition of a non-exported function template, a
11079 non-exported member function template, or a non-exported
11080 member function or static data member of a class template
11081 shall be present in every translation unit in which it is
11082 explicitly instantiated. */
11084 ("explicit instantiation of `%D' but no definition available", d);
11086 add_pending_template (d);
11090 need_push = !cfun || !global_bindings_p ();
11092 push_to_top_level ();
11094 /* Mark D as instantiated so that recursive calls to
11095 instantiate_decl do not try to instantiate it again. */
11096 DECL_TEMPLATE_INSTANTIATED (d) = 1;
11098 /* Regenerate the declaration in case the template has been modified
11099 by a subsequent redeclaration. */
11100 regenerate_decl_from_template (d, td);
11102 /* We already set the file and line above. Reset them now in case
11103 they changed as a result of calling regenerate_decl_from_template. */
11104 input_location = DECL_SOURCE_LOCATION (d);
11106 if (TREE_CODE (d) == VAR_DECL)
11108 /* Clear out DECL_RTL; whatever was there before may not be right
11109 since we've reset the type of the declaration. */
11110 SET_DECL_RTL (d, NULL_RTX);
11112 DECL_IN_AGGR_P (d) = 0;
11113 import_export_decl (d);
11114 DECL_EXTERNAL (d) = ! DECL_NOT_REALLY_EXTERN (d);
11116 if (DECL_EXTERNAL (d))
11118 /* The fact that this code is executing indicates that:
11120 (1) D is a template static data member, for which a
11121 definition is available.
11123 (2) An implicit or explicit instantiation has occurred.
11125 (3) We are not going to emit a definition of the static
11126 data member at this time.
11128 This situation is peculiar, but it occurs on platforms
11129 without weak symbols when performing an implicit
11130 instantiation. There, we cannot implicitly instantiate a
11131 defined static data member in more than one translation
11132 unit, so import_export_decl marks the declaration as
11133 external; we must rely on explicit instantiation.
11135 Reset instantiated marker to make sure that later
11136 explicit instantiation will be processed. */
11137 DECL_TEMPLATE_INSTANTIATED (d) = 0;
11141 /* This is done in analogous to `start_decl'. It is
11142 required for correct access checking. */
11143 push_nested_class (DECL_CONTEXT (d));
11145 (!DECL_INITIALIZED_IN_CLASS_P (d)
11146 ? DECL_INITIAL (d) : NULL_TREE),
11148 /* Normally, pop_nested_class is called by cp_finish_decl
11149 above. But when instantiate_decl is triggered during
11150 instantiate_class_template processing, its DECL_CONTEXT
11151 is still not completed yet, and pop_nested_class isn't
11153 if (!COMPLETE_TYPE_P (DECL_CONTEXT (d)))
11154 pop_nested_class ();
11157 else if (TREE_CODE (d) == FUNCTION_DECL)
11159 htab_t saved_local_specializations;
11164 /* Mark D as instantiated so that recursive calls to
11165 instantiate_decl do not try to instantiate it again. */
11166 DECL_TEMPLATE_INSTANTIATED (d) = 1;
11168 /* Save away the current list, in case we are instantiating one
11169 template from within the body of another. */
11170 saved_local_specializations = local_specializations;
11172 /* Set up the list of local specializations. */
11173 local_specializations = htab_create (37,
11174 hash_local_specialization,
11175 eq_local_specializations,
11178 /* Set up context. */
11179 import_export_decl (d);
11180 start_preparsed_function (d, NULL_TREE, SF_PRE_PARSED);
11182 /* Create substitution entries for the parameters. */
11183 subst_decl = DECL_TEMPLATE_RESULT (template_for_substitution (d));
11184 tmpl_parm = DECL_ARGUMENTS (subst_decl);
11185 spec_parm = DECL_ARGUMENTS (d);
11186 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (d))
11188 register_local_specialization (spec_parm, tmpl_parm);
11189 spec_parm = skip_artificial_parms_for (d, spec_parm);
11190 tmpl_parm = skip_artificial_parms_for (subst_decl, tmpl_parm);
11194 register_local_specialization (spec_parm, tmpl_parm);
11195 tmpl_parm = TREE_CHAIN (tmpl_parm);
11196 spec_parm = TREE_CHAIN (spec_parm);
11198 my_friendly_assert (!spec_parm, 20020813);
11200 /* Substitute into the body of the function. */
11201 tsubst_expr (DECL_SAVED_TREE (code_pattern), args,
11202 tf_error | tf_warning, tmpl);
11204 /* We don't need the local specializations any more. */
11205 htab_delete (local_specializations);
11206 local_specializations = saved_local_specializations;
11208 /* Finish the function. */
11209 d = finish_function (0);
11210 expand_or_defer_fn (d);
11213 /* We're not deferring instantiation any more. */
11214 TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (d)) = 0;
11217 pop_from_top_level ();
11220 input_location = saved_loc;
11221 pop_deferring_access_checks ();
11222 pop_tinst_level ();
11224 timevar_pop (TV_PARSE);
11229 /* Run through the list of templates that we wish we could
11230 instantiate, and instantiate any we can. */
11233 instantiate_pending_templates (void)
11236 tree last = NULL_TREE;
11237 int instantiated_something = 0;
11239 location_t saved_loc = input_location;
11245 t = &pending_templates;
11248 tree instantiation = TREE_VALUE (*t);
11250 reopen_tinst_level (TREE_PURPOSE (*t));
11252 if (TYPE_P (instantiation))
11256 if (!COMPLETE_TYPE_P (instantiation))
11258 instantiate_class_template (instantiation);
11259 if (CLASSTYPE_TEMPLATE_INSTANTIATION (instantiation))
11260 for (fn = TYPE_METHODS (instantiation);
11262 fn = TREE_CHAIN (fn))
11263 if (! DECL_ARTIFICIAL (fn))
11264 instantiate_decl (fn, /*defer_ok=*/0,
11265 /*undefined_ok=*/0);
11266 if (COMPLETE_TYPE_P (instantiation))
11268 instantiated_something = 1;
11273 if (COMPLETE_TYPE_P (instantiation))
11274 /* If INSTANTIATION has been instantiated, then we don't
11275 need to consider it again in the future. */
11276 *t = TREE_CHAIN (*t);
11280 t = &TREE_CHAIN (*t);
11285 if (!DECL_TEMPLATE_SPECIALIZATION (instantiation)
11286 && !DECL_TEMPLATE_INSTANTIATED (instantiation))
11288 instantiation = instantiate_decl (instantiation,
11290 /*undefined_ok=*/0);
11291 if (DECL_TEMPLATE_INSTANTIATED (instantiation))
11293 instantiated_something = 1;
11298 if (DECL_TEMPLATE_SPECIALIZATION (instantiation)
11299 || DECL_TEMPLATE_INSTANTIATED (instantiation))
11300 /* If INSTANTIATION has been instantiated, then we don't
11301 need to consider it again in the future. */
11302 *t = TREE_CHAIN (*t);
11306 t = &TREE_CHAIN (*t);
11310 current_tinst_level = NULL_TREE;
11312 last_pending_template = last;
11314 while (reconsider);
11316 input_location = saved_loc;
11317 return instantiated_something;
11320 /* Substitute ARGVEC into T, which is a list of initializers for
11321 either base class or a non-static data member. The TREE_PURPOSEs
11322 are DECLs, and the TREE_VALUEs are the initializer values. Used by
11323 instantiate_decl. */
11326 tsubst_initializer_list (tree t, tree argvec)
11328 tree inits = NULL_TREE;
11330 for (; t; t = TREE_CHAIN (t))
11336 decl = tsubst_copy (TREE_PURPOSE (t), argvec, tf_error | tf_warning,
11338 decl = expand_member_init (decl);
11339 if (decl && !DECL_P (decl))
11340 in_base_initializer = 1;
11342 init = tsubst_expr (TREE_VALUE (t), argvec, tf_error | tf_warning,
11346 else if (TREE_CODE (init) == TREE_LIST)
11347 for (val = init; val; val = TREE_CHAIN (val))
11348 TREE_VALUE (val) = convert_from_reference (TREE_VALUE (val));
11349 else if (init != void_type_node)
11350 init = convert_from_reference (init);
11352 in_base_initializer = 0;
11356 init = build_tree_list (decl, init);
11357 TREE_CHAIN (init) = inits;
11364 /* Set CURRENT_ACCESS_SPECIFIER based on the protection of DECL. */
11367 set_current_access_from_decl (tree decl)
11369 if (TREE_PRIVATE (decl))
11370 current_access_specifier = access_private_node;
11371 else if (TREE_PROTECTED (decl))
11372 current_access_specifier = access_protected_node;
11374 current_access_specifier = access_public_node;
11377 /* Instantiate an enumerated type. TAG is the template type, NEWTAG
11378 is the instantiation (which should have been created with
11379 start_enum) and ARGS are the template arguments to use. */
11382 tsubst_enum (tree tag, tree newtag, tree args)
11386 for (e = TYPE_VALUES (tag); e; e = TREE_CHAIN (e))
11391 decl = TREE_VALUE (e);
11392 /* Note that in a template enum, the TREE_VALUE is the
11393 CONST_DECL, not the corresponding INTEGER_CST. */
11394 value = tsubst_expr (DECL_INITIAL (decl),
11395 args, tf_error | tf_warning,
11398 /* Give this enumeration constant the correct access. */
11399 set_current_access_from_decl (decl);
11401 /* Actually build the enumerator itself. */
11402 build_enumerator (DECL_NAME (decl), value, newtag);
11405 finish_enum (newtag);
11406 DECL_SOURCE_LOCATION (TYPE_NAME (newtag))
11407 = DECL_SOURCE_LOCATION (TYPE_NAME (tag));
11410 /* DECL is a FUNCTION_DECL that is a template specialization. Return
11411 its type -- but without substituting the innermost set of template
11412 arguments. So, innermost set of template parameters will appear in
11416 get_mostly_instantiated_function_type (tree decl)
11424 tmpl = most_general_template (DECL_TI_TEMPLATE (decl));
11425 targs = DECL_TI_ARGS (decl);
11426 tparms = DECL_TEMPLATE_PARMS (tmpl);
11427 parm_depth = TMPL_PARMS_DEPTH (tparms);
11429 /* There should be as many levels of arguments as there are levels
11431 my_friendly_assert (parm_depth == TMPL_ARGS_DEPTH (targs), 0);
11433 fn_type = TREE_TYPE (tmpl);
11435 if (parm_depth == 1)
11436 /* No substitution is necessary. */
11443 /* Replace the innermost level of the TARGS with NULL_TREEs to
11444 let tsubst know not to substitute for those parameters. */
11445 partial_args = make_tree_vec (TREE_VEC_LENGTH (targs));
11446 for (i = 1; i < TMPL_ARGS_DEPTH (targs); ++i)
11447 SET_TMPL_ARGS_LEVEL (partial_args, i,
11448 TMPL_ARGS_LEVEL (targs, i));
11449 SET_TMPL_ARGS_LEVEL (partial_args,
11450 TMPL_ARGS_DEPTH (targs),
11451 make_tree_vec (DECL_NTPARMS (tmpl)));
11453 /* Make sure that we can see identifiers, and compute access
11454 correctly. We can just use the context of DECL for the
11455 partial substitution here. It depends only on outer template
11456 parameters, regardless of whether the innermost level is
11457 specialized or not. */
11458 push_access_scope (decl);
11460 ++processing_template_decl;
11461 /* Now, do the (partial) substitution to figure out the
11462 appropriate function type. */
11463 fn_type = tsubst (fn_type, partial_args, tf_error, NULL_TREE);
11464 --processing_template_decl;
11466 /* Substitute into the template parameters to obtain the real
11467 innermost set of parameters. This step is important if the
11468 innermost set of template parameters contains value
11469 parameters whose types depend on outer template parameters. */
11470 TREE_VEC_LENGTH (partial_args)--;
11471 tparms = tsubst_template_parms (tparms, partial_args, tf_error);
11473 pop_access_scope (decl);
11479 /* Return truthvalue if we're processing a template different from
11480 the last one involved in diagnostics. */
11482 problematic_instantiation_changed (void)
11484 return last_template_error_tick != tinst_level_tick;
11487 /* Remember current template involved in diagnostics. */
11489 record_last_problematic_instantiation (void)
11491 last_template_error_tick = tinst_level_tick;
11495 current_instantiation (void)
11497 return current_tinst_level;
11500 /* [temp.param] Check that template non-type parm TYPE is of an allowable
11501 type. Return zero for ok, nonzero for disallowed. Issue error and
11502 warning messages under control of COMPLAIN. */
11505 invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain)
11507 if (INTEGRAL_TYPE_P (type))
11509 else if (POINTER_TYPE_P (type))
11511 else if (TYPE_PTR_TO_MEMBER_P (type))
11513 else if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11515 else if (TREE_CODE (type) == TYPENAME_TYPE)
11518 if (complain & tf_error)
11519 error ("`%#T' is not a valid type for a template constant parameter",
11524 /* Returns TRUE if TYPE is dependent, in the sense of [temp.dep.type].
11525 Assumes that TYPE really is a type, and not the ERROR_MARK_NODE.*/
11528 dependent_type_p_r (tree type)
11534 A type is dependent if it is:
11536 -- a template parameter. Template template parameters are
11537 types for us (since TYPE_P holds true for them) so we
11538 handle them here. */
11539 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
11540 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM)
11542 /* -- a qualified-id with a nested-name-specifier which contains a
11543 class-name that names a dependent type or whose unqualified-id
11544 names a dependent type. */
11545 if (TREE_CODE (type) == TYPENAME_TYPE)
11547 /* -- a cv-qualified type where the cv-unqualified type is
11549 type = TYPE_MAIN_VARIANT (type);
11550 /* -- a compound type constructed from any dependent type. */
11551 if (TYPE_PTR_TO_MEMBER_P (type))
11552 return (dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type))
11553 || dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE
11555 else if (TREE_CODE (type) == POINTER_TYPE
11556 || TREE_CODE (type) == REFERENCE_TYPE)
11557 return dependent_type_p (TREE_TYPE (type));
11558 else if (TREE_CODE (type) == FUNCTION_TYPE
11559 || TREE_CODE (type) == METHOD_TYPE)
11563 if (dependent_type_p (TREE_TYPE (type)))
11565 for (arg_type = TYPE_ARG_TYPES (type);
11567 arg_type = TREE_CHAIN (arg_type))
11568 if (dependent_type_p (TREE_VALUE (arg_type)))
11572 /* -- an array type constructed from any dependent type or whose
11573 size is specified by a constant expression that is
11574 value-dependent. */
11575 if (TREE_CODE (type) == ARRAY_TYPE)
11577 if (TYPE_DOMAIN (type)
11578 && ((value_dependent_expression_p
11579 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
11580 || (type_dependent_expression_p
11581 (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))))
11583 return dependent_type_p (TREE_TYPE (type));
11586 /* -- a template-id in which either the template name is a template
11588 if (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11590 /* ... or any of the template arguments is a dependent type or
11591 an expression that is type-dependent or value-dependent. */
11592 else if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INFO (type)
11593 && (any_dependent_template_arguments_p
11594 (INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (type)))))
11597 /* All TYPEOF_TYPEs are dependent; if the argument of the `typeof'
11598 expression is not type-dependent, then it should already been
11600 if (TREE_CODE (type) == TYPEOF_TYPE)
11603 /* The standard does not specifically mention types that are local
11604 to template functions or local classes, but they should be
11605 considered dependent too. For example:
11607 template <int I> void f() {
11612 The size of `E' cannot be known until the value of `I' has been
11613 determined. Therefore, `E' must be considered dependent. */
11614 scope = TYPE_CONTEXT (type);
11615 if (scope && TYPE_P (scope))
11616 return dependent_type_p (scope);
11617 else if (scope && TREE_CODE (scope) == FUNCTION_DECL)
11618 return type_dependent_expression_p (scope);
11620 /* Other types are non-dependent. */
11624 /* Returns TRUE if TYPE is dependent, in the sense of
11625 [temp.dep.type]. */
11628 dependent_type_p (tree type)
11630 /* If there are no template parameters in scope, then there can't be
11631 any dependent types. */
11632 if (!processing_template_decl)
11635 /* If the type is NULL, we have not computed a type for the entity
11636 in question; in that case, the type is dependent. */
11640 /* Erroneous types can be considered non-dependent. */
11641 if (type == error_mark_node)
11644 /* If we have not already computed the appropriate value for TYPE,
11646 if (!TYPE_DEPENDENT_P_VALID (type))
11648 TYPE_DEPENDENT_P (type) = dependent_type_p_r (type);
11649 TYPE_DEPENDENT_P_VALID (type) = 1;
11652 return TYPE_DEPENDENT_P (type);
11655 /* Returns TRUE if EXPRESSION is dependent, according to CRITERION. */
11658 dependent_scope_ref_p (tree expression, bool criterion (tree))
11663 my_friendly_assert (TREE_CODE (expression) == SCOPE_REF, 20030714);
11665 if (!TYPE_P (TREE_OPERAND (expression, 0)))
11668 scope = TREE_OPERAND (expression, 0);
11669 name = TREE_OPERAND (expression, 1);
11673 An id-expression is type-dependent if it contains a
11674 nested-name-specifier that contains a class-name that names a
11676 /* The suggested resolution to Core Issue 2 implies that if the
11677 qualifying type is the current class, then we must peek
11680 && currently_open_class (scope)
11681 && !criterion (name))
11683 if (dependent_type_p (scope))
11689 /* Returns TRUE if the EXPRESSION is value-dependent, in the sense of
11690 [temp.dep.constexpr] */
11693 value_dependent_expression_p (tree expression)
11695 if (!processing_template_decl)
11698 /* A name declared with a dependent type. */
11699 if (TREE_CODE (expression) == IDENTIFIER_NODE
11700 || (DECL_P (expression)
11701 && type_dependent_expression_p (expression)))
11703 /* A non-type template parameter. */
11704 if ((TREE_CODE (expression) == CONST_DECL
11705 && DECL_TEMPLATE_PARM_P (expression))
11706 || TREE_CODE (expression) == TEMPLATE_PARM_INDEX)
11708 /* A constant with integral or enumeration type and is initialized
11709 with an expression that is value-dependent. */
11710 if (TREE_CODE (expression) == VAR_DECL
11711 && DECL_INITIAL (expression)
11712 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (expression))
11713 && value_dependent_expression_p (DECL_INITIAL (expression)))
11715 /* These expressions are value-dependent if the type to which the
11716 cast occurs is dependent or the expression being casted is
11717 value-dependent. */
11718 if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR
11719 || TREE_CODE (expression) == STATIC_CAST_EXPR
11720 || TREE_CODE (expression) == CONST_CAST_EXPR
11721 || TREE_CODE (expression) == REINTERPRET_CAST_EXPR
11722 || TREE_CODE (expression) == CAST_EXPR)
11724 tree type = TREE_TYPE (expression);
11725 if (dependent_type_p (type))
11727 /* A functional cast has a list of operands. */
11728 expression = TREE_OPERAND (expression, 0);
11731 /* If there are no operands, it must be an expression such
11732 as "int()". This should not happen for aggregate types
11733 because it would form non-constant expressions. */
11734 my_friendly_assert (INTEGRAL_OR_ENUMERATION_TYPE_P (type),
11739 if (TREE_CODE (expression) == TREE_LIST)
11743 if (value_dependent_expression_p (TREE_VALUE (expression)))
11745 expression = TREE_CHAIN (expression);
11747 while (expression);
11751 return value_dependent_expression_p (expression);
11753 /* A `sizeof' expression is value-dependent if the operand is
11755 if (TREE_CODE (expression) == SIZEOF_EXPR
11756 || TREE_CODE (expression) == ALIGNOF_EXPR)
11758 expression = TREE_OPERAND (expression, 0);
11759 if (TYPE_P (expression))
11760 return dependent_type_p (expression);
11761 return type_dependent_expression_p (expression);
11763 if (TREE_CODE (expression) == SCOPE_REF)
11764 return dependent_scope_ref_p (expression, value_dependent_expression_p);
11765 if (TREE_CODE (expression) == COMPONENT_REF)
11766 return (value_dependent_expression_p (TREE_OPERAND (expression, 0))
11767 || value_dependent_expression_p (TREE_OPERAND (expression, 1)));
11768 /* A constant expression is value-dependent if any subexpression is
11769 value-dependent. */
11770 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (expression))))
11772 switch (TREE_CODE_CLASS (TREE_CODE (expression)))
11775 return (value_dependent_expression_p
11776 (TREE_OPERAND (expression, 0)));
11779 return ((value_dependent_expression_p
11780 (TREE_OPERAND (expression, 0)))
11781 || (value_dependent_expression_p
11782 (TREE_OPERAND (expression, 1))));
11786 for (i = 0; i < first_rtl_op (TREE_CODE (expression)); ++i)
11787 /* In some cases, some of the operands may be missing.
11788 (For example, in the case of PREDECREMENT_EXPR, the
11789 amount to increment by may be missing.) That doesn't
11790 make the expression dependent. */
11791 if (TREE_OPERAND (expression, i)
11792 && (value_dependent_expression_p
11793 (TREE_OPERAND (expression, i))))
11800 /* The expression is not value-dependent. */
11804 /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of
11805 [temp.dep.expr]. */
11808 type_dependent_expression_p (tree expression)
11810 if (!processing_template_decl)
11813 if (expression == error_mark_node)
11816 /* An unresolved name is always dependent. */
11817 if (TREE_CODE (expression) == IDENTIFIER_NODE)
11820 /* Some expression forms are never type-dependent. */
11821 if (TREE_CODE (expression) == PSEUDO_DTOR_EXPR
11822 || TREE_CODE (expression) == SIZEOF_EXPR
11823 || TREE_CODE (expression) == ALIGNOF_EXPR
11824 || TREE_CODE (expression) == TYPEID_EXPR
11825 || TREE_CODE (expression) == DELETE_EXPR
11826 || TREE_CODE (expression) == VEC_DELETE_EXPR
11827 || TREE_CODE (expression) == THROW_EXPR)
11830 /* The types of these expressions depends only on the type to which
11831 the cast occurs. */
11832 if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR
11833 || TREE_CODE (expression) == STATIC_CAST_EXPR
11834 || TREE_CODE (expression) == CONST_CAST_EXPR
11835 || TREE_CODE (expression) == REINTERPRET_CAST_EXPR
11836 || TREE_CODE (expression) == CAST_EXPR)
11837 return dependent_type_p (TREE_TYPE (expression));
11839 /* The types of these expressions depends only on the type created
11840 by the expression. */
11841 if (TREE_CODE (expression) == NEW_EXPR
11842 || TREE_CODE (expression) == VEC_NEW_EXPR)
11844 /* For NEW_EXPR tree nodes created inside a template, either
11845 the object type itself or a TREE_LIST may appear as the
11847 tree type = TREE_OPERAND (expression, 1);
11848 if (TREE_CODE (type) == TREE_LIST)
11849 /* This is an array type. We need to check array dimensions
11851 return dependent_type_p (TREE_VALUE (TREE_PURPOSE (type)))
11852 || value_dependent_expression_p
11853 (TREE_OPERAND (TREE_VALUE (type), 1));
11855 return dependent_type_p (type);
11858 if (TREE_CODE (expression) == SCOPE_REF
11859 && dependent_scope_ref_p (expression,
11860 type_dependent_expression_p))
11863 if (TREE_CODE (expression) == FUNCTION_DECL
11864 && DECL_LANG_SPECIFIC (expression)
11865 && DECL_TEMPLATE_INFO (expression)
11866 && (any_dependent_template_arguments_p
11867 (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression)))))
11870 if (TREE_CODE (expression) == TEMPLATE_DECL
11871 && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression))
11874 if (TREE_TYPE (expression) == unknown_type_node)
11876 if (TREE_CODE (expression) == ADDR_EXPR)
11877 return type_dependent_expression_p (TREE_OPERAND (expression, 0));
11878 if (TREE_CODE (expression) == COMPONENT_REF
11879 || TREE_CODE (expression) == OFFSET_REF)
11881 if (type_dependent_expression_p (TREE_OPERAND (expression, 0)))
11883 expression = TREE_OPERAND (expression, 1);
11884 if (TREE_CODE (expression) == IDENTIFIER_NODE)
11888 if (TREE_CODE (expression) == BASELINK)
11889 expression = BASELINK_FUNCTIONS (expression);
11890 if (TREE_CODE (expression) == TEMPLATE_ID_EXPR)
11892 if (any_dependent_template_arguments_p
11893 (TREE_OPERAND (expression, 1)))
11895 expression = TREE_OPERAND (expression, 0);
11897 if (TREE_CODE (expression) == OVERLOAD)
11901 if (type_dependent_expression_p (OVL_CURRENT (expression)))
11903 expression = OVL_NEXT (expression);
11910 return (dependent_type_p (TREE_TYPE (expression)));
11913 /* Returns TRUE if ARGS (a TREE_LIST of arguments to a function call)
11914 contains a type-dependent expression. */
11917 any_type_dependent_arguments_p (tree args)
11921 tree arg = TREE_VALUE (args);
11923 if (type_dependent_expression_p (arg))
11925 args = TREE_CHAIN (args);
11930 /* Returns TRUE if the ARG (a template argument) is dependent. */
11933 dependent_template_arg_p (tree arg)
11935 if (!processing_template_decl)
11938 if (TREE_CODE (arg) == TEMPLATE_DECL
11939 || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM)
11940 return dependent_template_p (arg);
11941 else if (TYPE_P (arg))
11942 return dependent_type_p (arg);
11944 return (type_dependent_expression_p (arg)
11945 || value_dependent_expression_p (arg));
11948 /* Returns true if ARGS (a collection of template arguments) contains
11949 any dependent arguments. */
11952 any_dependent_template_arguments_p (tree args)
11960 for (i = 0; i < TMPL_ARGS_DEPTH (args); ++i)
11962 tree level = TMPL_ARGS_LEVEL (args, i + 1);
11963 for (j = 0; j < TREE_VEC_LENGTH (level); ++j)
11964 if (dependent_template_arg_p (TREE_VEC_ELT (level, j)))
11971 /* Returns TRUE if the template TMPL is dependent. */
11974 dependent_template_p (tree tmpl)
11976 if (TREE_CODE (tmpl) == OVERLOAD)
11980 if (dependent_template_p (OVL_FUNCTION (tmpl)))
11982 tmpl = OVL_CHAIN (tmpl);
11987 /* Template template parameters are dependent. */
11988 if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl)
11989 || TREE_CODE (tmpl) == TEMPLATE_TEMPLATE_PARM)
11991 /* So are qualified names that have not been looked up. */
11992 if (TREE_CODE (tmpl) == SCOPE_REF)
11994 /* So are member templates of dependent classes. */
11995 if (TYPE_P (CP_DECL_CONTEXT (tmpl)))
11996 return dependent_type_p (DECL_CONTEXT (tmpl));
12000 /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */
12003 dependent_template_id_p (tree tmpl, tree args)
12005 return (dependent_template_p (tmpl)
12006 || any_dependent_template_arguments_p (args));
12009 /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the
12010 TYPENAME_TYPE corresponds. Returns ERROR_MARK_NODE if no such TYPE
12011 can be found. Note that this function peers inside uninstantiated
12012 templates and therefore should be used only in extremely limited
12016 resolve_typename_type (tree type, bool only_current_p)
12024 my_friendly_assert (TREE_CODE (type) == TYPENAME_TYPE,
12027 scope = TYPE_CONTEXT (type);
12028 name = TYPE_IDENTIFIER (type);
12030 /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve
12031 it first before we can figure out what NAME refers to. */
12032 if (TREE_CODE (scope) == TYPENAME_TYPE)
12033 scope = resolve_typename_type (scope, only_current_p);
12034 /* If we don't know what SCOPE refers to, then we cannot resolve the
12036 if (scope == error_mark_node || TREE_CODE (scope) == TYPENAME_TYPE)
12037 return error_mark_node;
12038 /* If the SCOPE is a template type parameter, we have no way of
12039 resolving the name. */
12040 if (TREE_CODE (scope) == TEMPLATE_TYPE_PARM)
12042 /* If the SCOPE is not the current instantiation, there's no reason
12043 to look inside it. */
12044 if (only_current_p && !currently_open_class (scope))
12045 return error_mark_node;
12046 /* If SCOPE is a partial instantiation, it will not have a valid
12047 TYPE_FIELDS list, so use the original template. */
12048 scope = CLASSTYPE_PRIMARY_TEMPLATE_TYPE (scope);
12049 /* Enter the SCOPE so that name lookup will be resolved as if we
12050 were in the class definition. In particular, SCOPE will no
12051 longer be considered a dependent type. */
12052 pop_p = push_scope (scope);
12053 /* Look up the declaration. */
12054 decl = lookup_member (scope, name, /*protect=*/0, /*want_type=*/true);
12055 /* Obtain the set of qualifiers applied to the TYPE. */
12056 quals = cp_type_quals (type);
12057 /* For a TYPENAME_TYPE like "typename X::template Y<T>", we want to
12058 find a TEMPLATE_DECL. Otherwise, we want to find a TYPE_DECL. */
12060 type = error_mark_node;
12061 else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == IDENTIFIER_NODE
12062 && TREE_CODE (decl) == TYPE_DECL)
12063 type = TREE_TYPE (decl);
12064 else if (TREE_CODE (TYPENAME_TYPE_FULLNAME (type)) == TEMPLATE_ID_EXPR
12065 && DECL_CLASS_TEMPLATE_P (decl))
12069 /* Obtain the template and the arguments. */
12070 tmpl = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 0);
12071 args = TREE_OPERAND (TYPENAME_TYPE_FULLNAME (type), 1);
12072 /* Instantiate the template. */
12073 type = lookup_template_class (tmpl, args, NULL_TREE, NULL_TREE,
12074 /*entering_scope=*/0, tf_error | tf_user);
12077 type = error_mark_node;
12078 /* Qualify the resulting type. */
12079 if (type != error_mark_node && quals)
12080 type = cp_build_qualified_type (type, quals);
12081 /* Leave the SCOPE. */
12088 /* EXPR is an expression which is not type-dependent. Return a proxy
12089 for EXPR that can be used to compute the types of larger
12090 expressions containing EXPR. */
12093 build_non_dependent_expr (tree expr)
12097 /* Preserve null pointer constants so that the type of things like
12098 "p == 0" where "p" is a pointer can be determined. */
12099 if (null_ptr_cst_p (expr))
12101 /* Preserve OVERLOADs; the functions must be available to resolve
12103 inner_expr = (TREE_CODE (expr) == ADDR_EXPR ?
12104 TREE_OPERAND (expr, 0) : expr);
12105 if (TREE_CODE (inner_expr) == OVERLOAD
12106 || TREE_CODE (inner_expr) == FUNCTION_DECL
12107 || TREE_CODE (inner_expr) == TEMPLATE_DECL
12108 || TREE_CODE (inner_expr) == TEMPLATE_ID_EXPR)
12110 /* Preserve string constants; conversions from string constants to
12111 "char *" are allowed, even though normally a "const char *"
12112 cannot be used to initialize a "char *". */
12113 if (TREE_CODE (expr) == STRING_CST)
12115 /* Preserve arithmetic constants, as an optimization -- there is no
12116 reason to create a new node. */
12117 if (TREE_CODE (expr) == INTEGER_CST || TREE_CODE (expr) == REAL_CST)
12119 /* Preserve THROW_EXPRs -- all throw-expressions have type "void".
12120 There is at least one place where we want to know that a
12121 particular expression is a throw-expression: when checking a ?:
12122 expression, there are special rules if the second or third
12123 argument is a throw-expression. */
12124 if (TREE_CODE (expr) == THROW_EXPR)
12127 if (TREE_CODE (expr) == COND_EXPR)
12128 return build (COND_EXPR,
12130 TREE_OPERAND (expr, 0),
12131 (TREE_OPERAND (expr, 1)
12132 ? build_non_dependent_expr (TREE_OPERAND (expr, 1))
12133 : build_non_dependent_expr (TREE_OPERAND (expr, 0))),
12134 build_non_dependent_expr (TREE_OPERAND (expr, 2)));
12135 if (TREE_CODE (expr) == COMPOUND_EXPR
12136 && !COMPOUND_EXPR_OVERLOADED (expr))
12137 return build (COMPOUND_EXPR,
12139 TREE_OPERAND (expr, 0),
12140 build_non_dependent_expr (TREE_OPERAND (expr, 1)));
12142 /* Otherwise, build a NON_DEPENDENT_EXPR.
12144 REFERENCE_TYPEs are not stripped for expressions in templates
12145 because doing so would play havoc with mangling. Consider, for
12148 template <typename T> void f<T& g>() { g(); }
12150 In the body of "f", the expression for "g" will have
12151 REFERENCE_TYPE, even though the standard says that it should
12152 not. The reason is that we must preserve the syntactic form of
12153 the expression so that mangling (say) "f<g>" inside the body of
12154 "f" works out correctly. Therefore, the REFERENCE_TYPE is
12156 return build1 (NON_DEPENDENT_EXPR, non_reference (TREE_TYPE (expr)), expr);
12159 /* ARGS is a TREE_LIST of expressions as arguments to a function call.
12160 Return a new TREE_LIST with the various arguments replaced with
12161 equivalent non-dependent expressions. */
12164 build_non_dependent_args (tree args)
12169 new_args = NULL_TREE;
12170 for (a = args; a; a = TREE_CHAIN (a))
12171 new_args = tree_cons (NULL_TREE,
12172 build_non_dependent_expr (TREE_VALUE (a)),
12174 return nreverse (new_args);
12177 #include "gt-cp-pt.h"