1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@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 3, 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 COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
51 #include "diagnostic.h"
55 #include "tree-flow.h"
56 #include "pointer-set.h"
59 static tree grokparms (tree parmlist, tree *);
60 static const char *redeclaration_error_message (tree, tree);
62 static int decl_jump_unsafe (tree);
63 static void require_complete_types_for_parms (tree);
64 static int ambi_op_p (enum tree_code);
65 static int unary_op_p (enum tree_code);
66 static void push_local_name (tree);
67 static tree grok_reference_init (tree, tree, tree, tree *);
68 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
70 static void record_unknown_type (tree, const char *);
71 static tree builtin_function_1 (tree, tree, bool);
72 static tree build_library_fn_1 (tree, enum tree_code, tree);
73 static int member_function_or_else (tree, tree, enum overload_flags);
74 static void bad_specifiers (tree, const char *, int, int, int, int,
76 static void check_for_uninitialized_const_var (tree);
77 static hashval_t typename_hash (const void *);
78 static int typename_compare (const void *, const void *);
79 static tree local_variable_p_walkfn (tree *, int *, void *);
80 static tree record_builtin_java_type (const char *, int);
81 static const char *tag_name (enum tag_types);
82 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
83 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
84 static void maybe_deduce_size_from_array_init (tree, tree);
85 static void layout_var_decl (tree);
86 static tree check_initializer (tree, tree, int, tree *);
87 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
88 static void save_function_data (tree);
89 static void check_function_type (tree, tree);
90 static void finish_constructor_body (void);
91 static void begin_destructor_body (void);
92 static void finish_destructor_body (void);
93 static tree create_array_type_for_decl (tree, tree, tree);
94 static tree get_atexit_node (void);
95 static tree get_dso_handle_node (void);
96 static tree start_cleanup_fn (void);
97 static void end_cleanup_fn (void);
98 static tree cp_make_fname_decl (location_t, tree, int);
99 static void initialize_predefined_identifiers (void);
100 static tree check_special_function_return_type
101 (special_function_kind, tree, tree);
102 static tree push_cp_library_fn (enum tree_code, tree);
103 static tree build_cp_library_fn (tree, enum tree_code, tree);
104 static void store_parm_decls (tree);
105 static void initialize_local_var (tree, tree);
106 static void expand_static_init (tree, tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct GTY(()) named_label_use_entry {
173 struct named_label_use_entry *next;
174 /* The binding level to which this entry is *currently* attached.
175 This is initially the binding level in which the goto appeared,
176 but is modified as scopes are closed. */
177 struct cp_binding_level *binding_level;
178 /* The head of the names list that was current when the goto appeared,
179 or the inner scope popped. These are the decls that will *not* be
180 skipped when jumping to the label. */
182 /* The location of the goto, for error reporting. */
183 location_t o_goto_locus;
184 /* True if an OpenMP structured block scope has been closed since
185 the goto appeared. This means that the branch from the label will
186 illegally exit an OpenMP scope. */
190 /* A list of all LABEL_DECLs in the function that have names. Here so
191 we can clear out their names' definitions at the end of the
192 function, and so we can check the validity of jumps to these labels. */
194 struct GTY(()) named_label_entry {
195 /* The decl itself. */
198 /* The binding level to which the label is *currently* attached.
199 This is initially set to the binding level in which the label
200 is defined, but is modified as scopes are closed. */
201 struct cp_binding_level *binding_level;
202 /* The head of the names list that was current when the label was
203 defined, or the inner scope popped. These are the decls that will
204 be skipped when jumping to the label. */
206 /* A tree list of all decls from all binding levels that would be
207 crossed by a backward branch to the label. */
210 /* A list of uses of the label, before the label is defined. */
211 struct named_label_use_entry *uses;
213 /* The following bits are set after the label is defined, and are
214 updated as scopes are popped. They indicate that a backward jump
215 to the label will illegally enter a scope of the given flavor. */
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* To avoid unwanted recursion, finish_function defers all mark_used calls
229 encountered during its execution until it finishes. */
230 bool defer_mark_used_calls;
231 VEC(tree, gc) *deferred_mark_used_calls;
233 /* States indicating how grokdeclarator() should handle declspecs marked
234 with __attribute__((deprecated)). An object declared as
235 __attribute__((deprecated)) suppresses warnings of uses of other
237 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
240 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
241 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
242 time the VAR_DECL was declared, the type was incomplete. */
244 static GTY(()) tree incomplete_vars;
246 /* Returns the kind of template specialization we are currently
247 processing, given that it's declaration contained N_CLASS_SCOPES
248 explicit scope qualifications. */
251 current_tmpl_spec_kind (int n_class_scopes)
253 int n_template_parm_scopes = 0;
254 int seen_specialization_p = 0;
255 int innermost_specialization_p = 0;
256 struct cp_binding_level *b;
258 /* Scan through the template parameter scopes. */
259 for (b = current_binding_level;
260 b->kind == sk_template_parms;
263 /* If we see a specialization scope inside a parameter scope,
264 then something is wrong. That corresponds to a declaration
267 template <class T> template <> ...
269 which is always invalid since [temp.expl.spec] forbids the
270 specialization of a class member template if the enclosing
271 class templates are not explicitly specialized as well. */
272 if (b->explicit_spec_p)
274 if (n_template_parm_scopes == 0)
275 innermost_specialization_p = 1;
277 seen_specialization_p = 1;
279 else if (seen_specialization_p == 1)
280 return tsk_invalid_member_spec;
282 ++n_template_parm_scopes;
285 /* Handle explicit instantiations. */
286 if (processing_explicit_instantiation)
288 if (n_template_parm_scopes != 0)
289 /* We've seen a template parameter list during an explicit
290 instantiation. For example:
292 template <class T> template void f(int);
294 This is erroneous. */
295 return tsk_invalid_expl_inst;
297 return tsk_expl_inst;
300 if (n_template_parm_scopes < n_class_scopes)
301 /* We've not seen enough template headers to match all the
302 specialized classes present. For example:
304 template <class T> void R<T>::S<T>::f(int);
306 This is invalid; there needs to be one set of template
307 parameters for each class. */
308 return tsk_insufficient_parms;
309 else if (n_template_parm_scopes == n_class_scopes)
310 /* We're processing a non-template declaration (even though it may
311 be a member of a template class.) For example:
313 template <class T> void S<T>::f(int);
315 The `class T' matches the `S<T>', leaving no template headers
316 corresponding to the `f'. */
318 else if (n_template_parm_scopes > n_class_scopes + 1)
319 /* We've got too many template headers. For example:
321 template <> template <class T> void f (T);
323 There need to be more enclosing classes. */
324 return tsk_excessive_parms;
326 /* This must be a template. It's of the form:
328 template <class T> template <class U> void S<T>::f(U);
330 This is a specialization if the innermost level was a
331 specialization; otherwise it's just a definition of the
333 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
336 /* Exit the current scope. */
344 /* When a label goes out of scope, check to see if that label was used
345 in a valid manner, and issue any appropriate warnings or errors. */
348 pop_label (tree label, tree old_value)
350 if (!processing_template_decl)
352 if (DECL_INITIAL (label) == NULL_TREE)
356 error ("label %q+D used but not defined", label);
357 location = input_location; /* FIXME want (input_filename, (line)0) */
358 /* Avoid crashing later. */
359 define_label (location, DECL_NAME (label));
362 warn_for_unused_label (label);
365 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
368 /* At the end of a function, all labels declared within the function
369 go out of scope. BLOCK is the top-level block for the
373 pop_labels_1 (void **slot, void *data)
375 struct named_label_entry *ent = (struct named_label_entry *) *slot;
376 tree block = (tree) data;
378 pop_label (ent->label_decl, NULL_TREE);
380 /* Put the labels into the "variables" of the top-level block,
381 so debugger can see them. */
382 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
383 BLOCK_VARS (block) = ent->label_decl;
385 htab_clear_slot (named_labels, slot);
391 pop_labels (tree block)
395 htab_traverse (named_labels, pop_labels_1, block);
400 /* At the end of a block with local labels, restore the outer definition. */
403 pop_local_label (tree label, tree old_value)
405 struct named_label_entry dummy;
408 pop_label (label, old_value);
410 dummy.label_decl = label;
411 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
412 htab_clear_slot (named_labels, slot);
415 /* The following two routines are used to interface to Objective-C++.
416 The binding level is purposely treated as an opaque type. */
419 objc_get_current_scope (void)
421 return current_binding_level;
424 /* The following routine is used by the NeXT-style SJLJ exceptions;
425 variables get marked 'volatile' so as to not be clobbered by
426 _setjmp()/_longjmp() calls. All variables in the current scope,
427 as well as parent scopes up to (but not including) ENCLOSING_BLK
428 shall be thusly marked. */
431 objc_mark_locals_volatile (void *enclosing_blk)
433 struct cp_binding_level *scope;
435 for (scope = current_binding_level;
436 scope && scope != enclosing_blk;
437 scope = scope->level_chain)
441 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
442 objc_volatilize_decl (decl);
444 /* Do not climb up past the current function. */
445 if (scope->kind == sk_function_parms)
450 /* Update data for defined and undefined labels when leaving a scope. */
453 poplevel_named_label_1 (void **slot, void *data)
455 struct named_label_entry *ent = (struct named_label_entry *) *slot;
456 struct cp_binding_level *bl = (struct cp_binding_level *) data;
457 struct cp_binding_level *obl = bl->level_chain;
459 if (ent->binding_level == bl)
463 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
464 if (decl_jump_unsafe (decl))
465 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
467 ent->binding_level = obl;
468 ent->names_in_scope = obl->names;
472 ent->in_try_scope = true;
475 ent->in_catch_scope = true;
478 ent->in_omp_scope = true;
486 struct named_label_use_entry *use;
488 for (use = ent->uses; use ; use = use->next)
489 if (use->binding_level == bl)
491 use->binding_level = obl;
492 use->names_in_scope = obl->names;
493 if (bl->kind == sk_omp)
494 use->in_omp_scope = true;
501 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
502 when errors were reported, except for -Werror-unused-but-set-*. */
503 static int unused_but_set_errorcount;
505 /* Exit a binding level.
506 Pop the level off, and restore the state of the identifier-decl mappings
507 that were in effect when this level was entered.
509 If KEEP == 1, this level had explicit declarations, so
510 and create a "block" (a BLOCK node) for the level
511 to record its declarations and subblocks for symbol table output.
513 If FUNCTIONBODY is nonzero, this level is the body of a function,
514 so create a block as if KEEP were set and also clear out all
517 If REVERSE is nonzero, reverse the order of decls before putting
518 them into the BLOCK. */
521 poplevel (int keep, int reverse, int functionbody)
524 /* The chain of decls was accumulated in reverse order.
525 Put it into forward order, just for cleanliness. */
530 int leaving_for_scope;
533 timevar_push (TV_NAME_LOOKUP);
538 gcc_assert (current_binding_level->kind != sk_class);
540 if (current_binding_level->kind == sk_cleanup)
542 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
544 gcc_assert (!VEC_length(cp_class_binding,
545 current_binding_level->class_shadowed));
547 /* We used to use KEEP == 2 to indicate that the new block should go
548 at the beginning of the list of blocks at this binding level,
549 rather than the end. This hack is no longer used. */
550 gcc_assert (keep == 0 || keep == 1);
552 if (current_binding_level->keep)
555 /* Any uses of undefined labels, and any defined labels, now operate
556 under constraints of next binding contour. */
557 if (cfun && !functionbody && named_labels)
558 htab_traverse (named_labels, poplevel_named_label_1,
559 current_binding_level);
561 /* Get the decls in the order they were written.
562 Usually current_binding_level->names is in reverse order.
563 But parameter decls were previously put in forward order. */
566 current_binding_level->names
567 = decls = nreverse (current_binding_level->names);
569 decls = current_binding_level->names;
571 /* If there were any declarations or structure tags in that level,
572 or if this level is a function body,
573 create a BLOCK to record them for the life of this function. */
575 if (keep == 1 || functionbody)
576 block = make_node (BLOCK);
577 if (block != NULL_TREE)
579 BLOCK_VARS (block) = decls;
580 BLOCK_SUBBLOCKS (block) = subblocks;
583 /* In each subblock, record that this is its superior. */
585 for (link = subblocks; link; link = BLOCK_CHAIN (link))
586 BLOCK_SUPERCONTEXT (link) = block;
588 /* We still support the old for-scope rules, whereby the variables
589 in a for-init statement were in scope after the for-statement
590 ended. We only use the new rules if flag_new_for_scope is
593 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
595 /* Before we remove the declarations first check for unused variables. */
596 if ((warn_unused_variable || warn_unused_but_set_variable)
597 && !processing_template_decl)
598 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
599 if (TREE_CODE (decl) == VAR_DECL
600 && (! TREE_USED (decl) || !DECL_READ_P (decl))
601 && ! DECL_IN_SYSTEM_HEADER (decl)
602 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
604 if (! TREE_USED (decl))
605 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
606 else if (DECL_CONTEXT (decl) == current_function_decl
607 && TREE_TYPE (decl) != error_mark_node
608 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
609 && errorcount == unused_but_set_errorcount
610 && (!CLASS_TYPE_P (TREE_TYPE (decl))
611 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
613 warning (OPT_Wunused_but_set_variable,
614 "variable %q+D set but not used", decl);
615 unused_but_set_errorcount = errorcount;
619 /* Remove declarations for all the DECLs in this level. */
620 for (link = decls; link; link = TREE_CHAIN (link))
622 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
625 tree name = DECL_NAME (link);
629 ob = outer_binding (name,
630 IDENTIFIER_BINDING (name),
633 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
635 ns_binding = NULL_TREE;
637 if (ob && ob->scope == current_binding_level->level_chain)
638 /* We have something like:
643 and we are leaving the `for' scope. There's no reason to
644 keep the binding of the inner `i' in this case. */
645 pop_binding (name, link);
646 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
647 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
648 /* Here, we have something like:
656 We must pop the for-scope binding so we know what's a
657 type and what isn't. */
658 pop_binding (name, link);
661 /* Mark this VAR_DECL as dead so that we can tell we left it
662 there only for backward compatibility. */
663 DECL_DEAD_FOR_LOCAL (link) = 1;
665 /* Keep track of what should have happened when we
666 popped the binding. */
669 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
670 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
673 /* Add it to the list of dead variables in the next
674 outermost binding to that we can remove these when we
675 leave that binding. */
676 current_binding_level->level_chain->dead_vars_from_for
677 = tree_cons (NULL_TREE, link,
678 current_binding_level->level_chain->
681 /* Although we don't pop the cxx_binding, we do clear
682 its SCOPE since the scope is going away now. */
683 IDENTIFIER_BINDING (name)->scope
684 = current_binding_level->level_chain;
691 /* Remove the binding. */
694 if (TREE_CODE (decl) == TREE_LIST)
695 decl = TREE_VALUE (decl);
698 if (TREE_CODE (name) == OVERLOAD)
699 name = OVL_FUNCTION (name);
701 gcc_assert (DECL_P (name));
702 pop_binding (DECL_NAME (name), decl);
706 /* Remove declarations for any `for' variables from inner scopes
707 that we kept around. */
708 for (link = current_binding_level->dead_vars_from_for;
709 link; link = TREE_CHAIN (link))
710 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
712 /* Restore the IDENTIFIER_TYPE_VALUEs. */
713 for (link = current_binding_level->type_shadowed;
714 link; link = TREE_CHAIN (link))
715 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
717 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
718 for (link = current_binding_level->shadowed_labels;
720 link = TREE_CHAIN (link))
721 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
723 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
724 list if a `using' declaration put them there. The debugging
725 back ends won't understand OVERLOAD, so we remove them here.
726 Because the BLOCK_VARS are (temporarily) shared with
727 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
728 popped all the bindings. */
733 for (d = &BLOCK_VARS (block); *d; )
735 if (TREE_CODE (*d) == TREE_LIST)
736 *d = TREE_CHAIN (*d);
738 d = &TREE_CHAIN (*d);
742 /* If the level being exited is the top level of a function,
743 check over all the labels. */
746 /* Since this is the top level block of a function, the vars are
747 the function's parameters. Don't leave them in the BLOCK
748 because they are found in the FUNCTION_DECL instead. */
749 BLOCK_VARS (block) = 0;
753 kind = current_binding_level->kind;
754 if (kind == sk_cleanup)
758 /* If this is a temporary binding created for a cleanup, then we'll
759 have pushed a statement list level. Pop that, create a new
760 BIND_EXPR for the block, and insert it into the stream. */
761 stmt = pop_stmt_list (current_binding_level->statement_list);
762 stmt = c_build_bind_expr (input_location, block, stmt);
769 /* The current function is being defined, so its DECL_INITIAL
770 should be error_mark_node. */
771 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
772 DECL_INITIAL (current_function_decl) = block;
775 current_binding_level->blocks
776 = chainon (current_binding_level->blocks, block);
778 /* If we did not make a block for the level just exited,
779 any blocks made for inner levels
780 (since they cannot be recorded as subblocks in that level)
781 must be carried forward so they will later become subblocks
782 of something else. */
784 current_binding_level->blocks
785 = chainon (current_binding_level->blocks, subblocks);
787 /* Each and every BLOCK node created here in `poplevel' is important
788 (e.g. for proper debugging information) so if we created one
789 earlier, mark it as "used". */
791 TREE_USED (block) = 1;
793 /* All temporary bindings created for cleanups are popped silently. */
794 if (kind == sk_cleanup)
797 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
800 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
801 itself, calling F for each. The DATA is passed to F as well. */
804 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
807 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
809 result |= (*f) (name_space, data);
811 for (; current; current = TREE_CHAIN (current))
812 result |= walk_namespaces_r (current, f, data);
817 /* Walk all the namespaces, calling F for each. The DATA is passed to
821 walk_namespaces (walk_namespaces_fn f, void* data)
823 return walk_namespaces_r (global_namespace, f, data);
826 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
827 DATA is non-NULL, this is the last time we will call
828 wrapup_global_declarations for this NAMESPACE. */
831 wrapup_globals_for_namespace (tree name_space, void* data)
833 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
834 VEC(tree,gc) *statics = level->static_decls;
835 tree *vec = VEC_address (tree, statics);
836 int len = VEC_length (tree, statics);
837 int last_time = (data != 0);
841 check_global_declarations (vec, len);
842 emit_debug_global_declarations (vec, len);
846 /* Write out any globals that need to be output. */
847 return wrapup_global_declarations (vec, len);
851 /* In C++, you don't have to write `struct S' to refer to `S'; you
852 can just use `S'. We accomplish this by creating a TYPE_DECL as
853 if the user had written `typedef struct S S'. Create and return
854 the TYPE_DECL for TYPE. */
857 create_implicit_typedef (tree name, tree type)
861 decl = build_decl (input_location, TYPE_DECL, name, type);
862 DECL_ARTIFICIAL (decl) = 1;
863 /* There are other implicit type declarations, like the one *within*
864 a class that allows you to write `S::S'. We must distinguish
866 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
867 TYPE_NAME (type) = decl;
868 TYPE_STUB_DECL (type) = decl;
873 /* Remember a local name for name-mangling purposes. */
876 push_local_name (tree decl)
881 timevar_push (TV_NAME_LOOKUP);
883 name = DECL_NAME (decl);
885 nelts = VEC_length (tree, local_names);
886 for (i = 0; i < nelts; i++)
888 t = VEC_index (tree, local_names, i);
889 if (DECL_NAME (t) == name)
891 if (!DECL_LANG_SPECIFIC (decl))
892 retrofit_lang_decl (decl);
893 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
894 if (DECL_LANG_SPECIFIC (t))
895 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
897 DECL_DISCRIMINATOR (decl) = 1;
899 VEC_replace (tree, local_names, i, decl);
900 timevar_pop (TV_NAME_LOOKUP);
905 VEC_safe_push (tree, gc, local_names, decl);
906 timevar_pop (TV_NAME_LOOKUP);
909 /* Subroutine of duplicate_decls: return truthvalue of whether
910 or not types of these decls match.
912 For C++, we must compare the parameter list so that `int' can match
913 `int&' in a parameter position, but `int&' is not confused with
917 decls_match (tree newdecl, tree olddecl)
921 if (newdecl == olddecl)
924 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
925 /* If the two DECLs are not even the same kind of thing, we're not
926 interested in their types. */
929 if (TREE_CODE (newdecl) == FUNCTION_DECL)
931 tree f1 = TREE_TYPE (newdecl);
932 tree f2 = TREE_TYPE (olddecl);
933 tree p1 = TYPE_ARG_TYPES (f1);
934 tree p2 = TYPE_ARG_TYPES (f2);
936 /* Specializations of different templates are different functions
937 even if they have the same type. */
938 tree t1 = (DECL_USE_TEMPLATE (newdecl)
939 ? DECL_TI_TEMPLATE (newdecl)
941 tree t2 = (DECL_USE_TEMPLATE (olddecl)
942 ? DECL_TI_TEMPLATE (olddecl)
947 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
948 && ! (DECL_EXTERN_C_P (newdecl)
949 && DECL_EXTERN_C_P (olddecl)))
952 #ifdef NO_IMPLICIT_EXTERN_C
953 /* A new declaration doesn't match a built-in one unless it
954 is also extern "C". */
955 if (DECL_IS_BUILTIN (olddecl)
956 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
960 if (TREE_CODE (f1) != TREE_CODE (f2))
963 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
965 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
966 && (DECL_BUILT_IN (olddecl)
967 #ifndef NO_IMPLICIT_EXTERN_C
968 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
969 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
973 types_match = self_promoting_args_p (p1);
974 if (p1 == void_list_node)
975 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
977 #ifndef NO_IMPLICIT_EXTERN_C
978 else if (p1 == NULL_TREE
979 && (DECL_EXTERN_C_P (olddecl)
980 && DECL_IN_SYSTEM_HEADER (olddecl)
981 && !DECL_CLASS_SCOPE_P (olddecl))
982 && (DECL_EXTERN_C_P (newdecl)
983 && DECL_IN_SYSTEM_HEADER (newdecl)
984 && !DECL_CLASS_SCOPE_P (newdecl)))
986 types_match = self_promoting_args_p (p2);
987 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
991 types_match = compparms (p1, p2);
996 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
998 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
999 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1002 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1003 DECL_TEMPLATE_PARMS (olddecl)))
1006 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1007 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1008 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1010 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1011 DECL_TEMPLATE_RESULT (newdecl));
1015 /* Need to check scope for variable declaration (VAR_DECL).
1016 For typedef (TYPE_DECL), scope is ignored. */
1017 if (TREE_CODE (newdecl) == VAR_DECL
1018 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1020 Two declarations for an object with C language linkage
1021 with the same name (ignoring the namespace that qualify
1022 it) that appear in different namespace scopes refer to
1024 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1027 if (TREE_TYPE (newdecl) == error_mark_node)
1028 types_match = TREE_TYPE (olddecl) == error_mark_node;
1029 else if (TREE_TYPE (olddecl) == NULL_TREE)
1030 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1031 else if (TREE_TYPE (newdecl) == NULL_TREE)
1034 types_match = comptypes (TREE_TYPE (newdecl),
1035 TREE_TYPE (olddecl),
1036 COMPARE_REDECLARATION);
1042 /* If NEWDECL is `static' and an `extern' was seen previously,
1043 warn about it. OLDDECL is the previous declaration.
1045 Note that this does not apply to the C++ case of declaring
1046 a variable `extern const' and then later `const'.
1048 Don't complain about built-in functions, since they are beyond
1049 the user's control. */
1052 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1054 if (TREE_CODE (newdecl) == TYPE_DECL
1055 || TREE_CODE (newdecl) == TEMPLATE_DECL
1056 || TREE_CODE (newdecl) == CONST_DECL
1057 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1060 /* Don't get confused by static member functions; that's a different
1062 if (TREE_CODE (newdecl) == FUNCTION_DECL
1063 && DECL_STATIC_FUNCTION_P (newdecl))
1066 /* If the old declaration was `static', or the new one isn't, then
1067 then everything is OK. */
1068 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1071 /* It's OK to declare a builtin function as `static'. */
1072 if (TREE_CODE (olddecl) == FUNCTION_DECL
1073 && DECL_ARTIFICIAL (olddecl))
1076 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1077 permerror (input_location, "previous declaration of %q+D", olddecl);
1080 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1081 function templates. If their exception specifications do not
1082 match, issue a diagnostic. */
1085 check_redeclaration_exception_specification (tree new_decl,
1090 tree new_exceptions;
1091 tree old_exceptions;
1093 new_type = TREE_TYPE (new_decl);
1094 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1095 old_type = TREE_TYPE (old_decl);
1096 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1100 If any declaration of a function has an exception-specification,
1101 all declarations, including the definition and an explicit
1102 specialization, of that function shall have an
1103 exception-specification with the same set of type-ids. */
1104 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1105 && ! DECL_IS_BUILTIN (old_decl)
1107 && !comp_except_specs (new_exceptions, old_exceptions,
1110 error ("declaration of %qF throws different exceptions", new_decl);
1111 error ("from previous declaration %q+F", old_decl);
1115 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1116 && lookup_attribute ("gnu_inline", \
1117 DECL_ATTRIBUTES (fn)))
1119 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1120 If the redeclaration is invalid, a diagnostic is issued, and the
1121 error_mark_node is returned. Otherwise, OLDDECL is returned.
1123 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1126 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1129 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1131 unsigned olddecl_uid = DECL_UID (olddecl);
1132 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1133 int new_defines_function = 0;
1134 tree new_template_info;
1136 if (newdecl == olddecl)
1139 types_match = decls_match (newdecl, olddecl);
1141 /* If either the type of the new decl or the type of the old decl is an
1142 error_mark_node, then that implies that we have already issued an
1143 error (earlier) for some bogus type specification, and in that case,
1144 it is rather pointless to harass the user with yet more error message
1145 about the same declaration, so just pretend the types match here. */
1146 if (TREE_TYPE (newdecl) == error_mark_node
1147 || TREE_TYPE (olddecl) == error_mark_node)
1148 return error_mark_node;
1150 if (DECL_P (olddecl)
1151 && TREE_CODE (newdecl) == FUNCTION_DECL
1152 && TREE_CODE (olddecl) == FUNCTION_DECL
1153 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1155 if (DECL_DECLARED_INLINE_P (newdecl)
1156 && DECL_UNINLINABLE (newdecl)
1157 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1158 /* Already warned elsewhere. */;
1159 else if (DECL_DECLARED_INLINE_P (olddecl)
1160 && DECL_UNINLINABLE (olddecl)
1161 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1162 /* Already warned. */;
1163 else if (DECL_DECLARED_INLINE_P (newdecl)
1164 && DECL_UNINLINABLE (olddecl)
1165 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1167 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1169 warning (OPT_Wattributes, "previous declaration of %q+D "
1170 "with attribute noinline", olddecl);
1172 else if (DECL_DECLARED_INLINE_P (olddecl)
1173 && DECL_UNINLINABLE (newdecl)
1174 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1176 warning (OPT_Wattributes, "function %q+D redeclared with "
1177 "attribute noinline", newdecl);
1178 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1183 /* Check for redeclaration and other discrepancies. */
1184 if (TREE_CODE (olddecl) == FUNCTION_DECL
1185 && DECL_ARTIFICIAL (olddecl))
1187 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1188 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1190 /* Avoid warnings redeclaring built-ins which have not been
1191 explicitly declared. */
1192 if (DECL_ANTICIPATED (olddecl))
1195 /* If you declare a built-in or predefined function name as static,
1196 the old definition is overridden, but optionally warn this was a
1197 bad choice of name. */
1198 if (! TREE_PUBLIC (newdecl))
1200 warning (OPT_Wshadow,
1201 DECL_BUILT_IN (olddecl)
1202 ? G_("shadowing built-in function %q#D")
1203 : G_("shadowing library function %q#D"), olddecl);
1204 /* Discard the old built-in function. */
1207 /* If the built-in is not ansi, then programs can override
1208 it even globally without an error. */
1209 else if (! DECL_BUILT_IN (olddecl))
1210 warning (0, "library function %q#D redeclared as non-function %q#D",
1214 error ("declaration of %q#D", newdecl);
1215 error ("conflicts with built-in declaration %q#D",
1220 else if (!types_match)
1222 /* Avoid warnings redeclaring built-ins which have not been
1223 explicitly declared. */
1224 if (DECL_ANTICIPATED (olddecl))
1226 /* Deal with fileptr_type_node. FILE type is not known
1227 at the time we create the builtins. */
1230 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1231 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1233 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1236 else if (TREE_VALUE (t2) == fileptr_type_node)
1238 tree t = TREE_VALUE (t1);
1240 if (TREE_CODE (t) == POINTER_TYPE
1241 && TYPE_NAME (TREE_TYPE (t))
1242 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1243 == get_identifier ("FILE")
1244 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1246 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1248 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1249 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1250 types_match = decls_match (newdecl, olddecl);
1252 return duplicate_decls (newdecl, olddecl,
1254 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1257 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1260 else if ((DECL_EXTERN_C_P (newdecl)
1261 && DECL_EXTERN_C_P (olddecl))
1262 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1263 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1265 /* A near match; override the builtin. */
1267 if (TREE_PUBLIC (newdecl))
1269 warning (0, "new declaration %q#D", newdecl);
1270 warning (0, "ambiguates built-in declaration %q#D",
1274 warning (OPT_Wshadow,
1275 DECL_BUILT_IN (olddecl)
1276 ? G_("shadowing built-in function %q#D")
1277 : G_("shadowing library function %q#D"), olddecl);
1280 /* Discard the old built-in function. */
1283 /* Replace the old RTL to avoid problems with inlining. */
1284 COPY_DECL_RTL (newdecl, olddecl);
1286 /* Even if the types match, prefer the new declarations type for
1287 built-ins which have not been explicitly declared, for
1288 exception lists, etc... */
1289 else if (DECL_ANTICIPATED (olddecl))
1291 tree type = TREE_TYPE (newdecl);
1292 tree attribs = (*targetm.merge_type_attributes)
1293 (TREE_TYPE (olddecl), type);
1295 type = cp_build_type_attribute_variant (type, attribs);
1296 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1299 /* If a function is explicitly declared "throw ()", propagate that to
1300 the corresponding builtin. */
1301 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1302 && DECL_ANTICIPATED (olddecl)
1303 && TREE_NOTHROW (newdecl)
1304 && !TREE_NOTHROW (olddecl)
1305 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1306 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1308 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1310 /* Whether or not the builtin can throw exceptions has no
1311 bearing on this declarator. */
1312 TREE_NOTHROW (olddecl) = 0;
1314 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1316 /* If a builtin function is redeclared as `static', merge
1317 the declarations, but make the original one static. */
1318 DECL_THIS_STATIC (olddecl) = 1;
1319 TREE_PUBLIC (olddecl) = 0;
1321 /* Make the old declaration consistent with the new one so
1322 that all remnants of the builtin-ness of this function
1323 will be banished. */
1324 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1325 COPY_DECL_RTL (newdecl, olddecl);
1328 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1330 /* C++ Standard, 3.3, clause 4:
1331 "[Note: a namespace name or a class template name must be unique
1332 in its declarative region (7.3.2, clause 14). ]" */
1333 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1334 && TREE_CODE (newdecl) != NAMESPACE_DECL
1335 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1336 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1337 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1338 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1340 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1341 && TREE_CODE (newdecl) != TYPE_DECL)
1342 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1343 && TREE_CODE (olddecl) != TYPE_DECL))
1345 /* We do nothing special here, because C++ does such nasty
1346 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1347 get shadowed, and know that if we need to find a TYPE_DECL
1348 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1349 slot of the identifier. */
1353 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1354 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1355 || (TREE_CODE (olddecl) == FUNCTION_DECL
1356 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1360 error ("%q#D redeclared as different kind of symbol", newdecl);
1361 if (TREE_CODE (olddecl) == TREE_LIST)
1362 olddecl = TREE_VALUE (olddecl);
1363 error ("previous declaration of %q+#D", olddecl);
1365 return error_mark_node;
1367 else if (!types_match)
1369 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1370 /* These are certainly not duplicate declarations; they're
1371 from different scopes. */
1374 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1376 /* The name of a class template may not be declared to refer to
1377 any other template, class, function, object, namespace, value,
1378 or type in the same scope. */
1379 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1380 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1382 error ("declaration of template %q#D", newdecl);
1383 error ("conflicts with previous declaration %q+#D", olddecl);
1385 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1386 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1387 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1388 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1389 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1390 DECL_TEMPLATE_PARMS (olddecl))
1391 /* Template functions can be disambiguated by
1393 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1394 TREE_TYPE (TREE_TYPE (olddecl))))
1396 error ("new declaration %q#D", newdecl);
1397 error ("ambiguates old declaration %q+#D", olddecl);
1401 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1403 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1405 error ("declaration of C function %q#D conflicts with",
1407 error ("previous declaration %q+#D here", olddecl);
1409 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1410 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1412 error ("new declaration %q#D", newdecl);
1413 error ("ambiguates old declaration %q+#D", olddecl);
1414 return error_mark_node;
1421 error ("conflicting declaration %q#D", newdecl);
1422 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1423 return error_mark_node;
1426 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1427 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1428 && (!DECL_TEMPLATE_INFO (newdecl)
1429 || (DECL_TI_TEMPLATE (newdecl)
1430 != DECL_TI_TEMPLATE (olddecl))))
1431 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1432 && (!DECL_TEMPLATE_INFO (olddecl)
1433 || (DECL_TI_TEMPLATE (olddecl)
1434 != DECL_TI_TEMPLATE (newdecl))))))
1435 /* It's OK to have a template specialization and a non-template
1436 with the same type, or to have specializations of two
1437 different templates with the same type. Note that if one is a
1438 specialization, and the other is an instantiation of the same
1439 template, that we do not exit at this point. That situation
1440 can occur if we instantiate a template class, and then
1441 specialize one of its methods. This situation is valid, but
1442 the declarations must be merged in the usual way. */
1444 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1445 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1446 && !DECL_USE_TEMPLATE (newdecl))
1447 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1448 && !DECL_USE_TEMPLATE (olddecl))))
1449 /* One of the declarations is a template instantiation, and the
1450 other is not a template at all. That's OK. */
1452 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1454 /* In [namespace.alias] we have:
1456 In a declarative region, a namespace-alias-definition can be
1457 used to redefine a namespace-alias declared in that declarative
1458 region to refer only to the namespace to which it already
1461 Therefore, if we encounter a second alias directive for the same
1462 alias, we can just ignore the second directive. */
1463 if (DECL_NAMESPACE_ALIAS (newdecl)
1464 && (DECL_NAMESPACE_ALIAS (newdecl)
1465 == DECL_NAMESPACE_ALIAS (olddecl)))
1467 /* [namespace.alias]
1469 A namespace-name or namespace-alias shall not be declared as
1470 the name of any other entity in the same declarative region.
1471 A namespace-name defined at global scope shall not be
1472 declared as the name of any other entity in any global scope
1474 error ("declaration of namespace %qD conflicts with", newdecl);
1475 error ("previous declaration of namespace %q+D here", olddecl);
1476 return error_mark_node;
1480 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1483 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1484 if (DECL_NAME (olddecl) != NULL_TREE)
1485 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1486 ? "%q+#D previously defined here"
1487 : "%q+#D previously declared here", olddecl);
1488 return error_mark_node;
1490 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1491 && DECL_INITIAL (olddecl) != NULL_TREE
1492 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1493 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1495 /* Prototype decl follows defn w/o prototype. */
1496 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1497 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1498 "follows non-prototype definition here");
1500 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1501 || TREE_CODE (olddecl) == VAR_DECL)
1502 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1505 If two declarations of the same function or object
1506 specify different linkage-specifications ..., the program
1507 is ill-formed.... Except for functions with C++ linkage,
1508 a function declaration without a linkage specification
1509 shall not precede the first linkage specification for
1510 that function. A function can be declared without a
1511 linkage specification after an explicit linkage
1512 specification has been seen; the linkage explicitly
1513 specified in the earlier declaration is not affected by
1514 such a function declaration.
1516 DR 563 raises the question why the restrictions on
1517 functions should not also apply to objects. Older
1518 versions of G++ silently ignore the linkage-specification
1526 which is clearly wrong. Therefore, we now treat objects
1528 if (current_lang_depth () == 0)
1530 /* There is no explicit linkage-specification, so we use
1531 the linkage from the previous declaration. */
1532 if (!DECL_LANG_SPECIFIC (newdecl))
1533 retrofit_lang_decl (newdecl);
1534 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1538 error ("previous declaration of %q+#D with %qL linkage",
1539 olddecl, DECL_LANGUAGE (olddecl));
1540 error ("conflicts with new declaration with %qL linkage",
1541 DECL_LANGUAGE (newdecl));
1545 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1547 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1549 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1550 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1553 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1554 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1556 for (; t1 && t1 != void_list_node;
1557 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1558 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1560 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1563 permerror (input_location, "default argument given for parameter %d of %q#D",
1565 permerror (input_location, "after previous specification in %q+#D", olddecl);
1569 error ("default argument given for parameter %d of %q#D",
1571 error ("after previous specification in %q+#D",
1578 /* Do not merge an implicit typedef with an explicit one. In:
1582 typedef class A A __attribute__ ((foo));
1584 the attribute should apply only to the typedef. */
1585 if (TREE_CODE (olddecl) == TYPE_DECL
1586 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1587 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1590 /* If new decl is `static' and an `extern' was seen previously,
1592 warn_extern_redeclared_static (newdecl, olddecl);
1594 /* We have committed to returning 1 at this point. */
1595 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1597 /* Now that functions must hold information normally held
1598 by field decls, there is extra work to do so that
1599 declaration information does not get destroyed during
1601 if (DECL_VINDEX (olddecl))
1602 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1603 if (DECL_CONTEXT (olddecl))
1604 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1605 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1606 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1607 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1608 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1609 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1610 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1611 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1612 SET_OVERLOADED_OPERATOR_CODE
1613 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1614 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1616 /* Optionally warn about more than one declaration for the same
1617 name, but don't warn about a function declaration followed by a
1619 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1620 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1621 /* Don't warn about extern decl followed by definition. */
1622 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1623 /* Don't warn about friends, let add_friend take care of it. */
1624 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1626 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1627 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1630 if (DECL_DELETED_FN (newdecl))
1632 error ("deleted definition of %qD", newdecl);
1633 error ("after previous declaration %q+D", olddecl);
1637 /* Deal with C++: must preserve virtual function table size. */
1638 if (TREE_CODE (olddecl) == TYPE_DECL)
1640 tree newtype = TREE_TYPE (newdecl);
1641 tree oldtype = TREE_TYPE (olddecl);
1643 if (newtype != error_mark_node && oldtype != error_mark_node
1644 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1645 CLASSTYPE_FRIEND_CLASSES (newtype)
1646 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1648 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1651 /* Copy all the DECL_... slots specified in the new decl
1652 except for any that we copy here from the old type. */
1653 DECL_ATTRIBUTES (newdecl)
1654 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1656 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1660 old_result = DECL_TEMPLATE_RESULT (olddecl);
1661 new_result = DECL_TEMPLATE_RESULT (newdecl);
1662 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1663 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1664 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1665 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1667 DECL_ATTRIBUTES (old_result)
1668 = (*targetm.merge_decl_attributes) (old_result, new_result);
1670 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1672 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1673 && DECL_INITIAL (new_result))
1675 if (DECL_INITIAL (old_result))
1676 DECL_UNINLINABLE (old_result) = 1;
1678 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1679 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1680 DECL_NOT_REALLY_EXTERN (old_result)
1681 = DECL_NOT_REALLY_EXTERN (new_result);
1682 DECL_INTERFACE_KNOWN (old_result)
1683 = DECL_INTERFACE_KNOWN (new_result);
1684 DECL_DECLARED_INLINE_P (old_result)
1685 = DECL_DECLARED_INLINE_P (new_result);
1686 DECL_DISREGARD_INLINE_LIMITS (old_result)
1687 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1692 DECL_DECLARED_INLINE_P (old_result)
1693 |= DECL_DECLARED_INLINE_P (new_result);
1694 DECL_DISREGARD_INLINE_LIMITS (old_result)
1695 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1696 check_redeclaration_exception_specification (newdecl, olddecl);
1700 /* If the new declaration is a definition, update the file and
1701 line information on the declaration, and also make
1702 the old declaration the same definition. */
1703 if (DECL_INITIAL (new_result) != NULL_TREE)
1705 DECL_SOURCE_LOCATION (olddecl)
1706 = DECL_SOURCE_LOCATION (old_result)
1707 = DECL_SOURCE_LOCATION (newdecl);
1708 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1709 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1712 DECL_ARGUMENTS (old_result)
1713 = DECL_ARGUMENTS (new_result);
1714 for (parm = DECL_ARGUMENTS (old_result); parm;
1715 parm = TREE_CHAIN (parm))
1716 DECL_CONTEXT (parm) = old_result;
1725 /* Automatically handles default parameters. */
1726 tree oldtype = TREE_TYPE (olddecl);
1729 /* Merge the data types specified in the two decls. */
1730 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1732 /* If merge_types produces a non-typedef type, just use the old type. */
1733 if (TREE_CODE (newdecl) == TYPE_DECL
1734 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1737 if (TREE_CODE (newdecl) == VAR_DECL)
1739 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1740 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1741 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1742 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1743 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1744 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1746 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1747 if (DECL_LANG_SPECIFIC (olddecl)
1748 && CP_DECL_THREADPRIVATE_P (olddecl))
1750 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1751 if (!DECL_LANG_SPECIFIC (newdecl))
1752 retrofit_lang_decl (newdecl);
1754 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1755 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1759 /* Do this after calling `merge_types' so that default
1760 parameters don't confuse us. */
1761 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1762 check_redeclaration_exception_specification (newdecl, olddecl);
1763 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1765 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1766 check_default_args (newdecl);
1768 /* Lay the type out, unless already done. */
1769 if (! same_type_p (newtype, oldtype)
1770 && TREE_TYPE (newdecl) != error_mark_node
1771 && !(processing_template_decl && uses_template_parms (newdecl)))
1772 layout_type (TREE_TYPE (newdecl));
1774 if ((TREE_CODE (newdecl) == VAR_DECL
1775 || TREE_CODE (newdecl) == PARM_DECL
1776 || TREE_CODE (newdecl) == RESULT_DECL
1777 || TREE_CODE (newdecl) == FIELD_DECL
1778 || TREE_CODE (newdecl) == TYPE_DECL)
1779 && !(processing_template_decl && uses_template_parms (newdecl)))
1780 layout_decl (newdecl, 0);
1782 /* Merge the type qualifiers. */
1783 if (TREE_READONLY (newdecl))
1784 TREE_READONLY (olddecl) = 1;
1785 if (TREE_THIS_VOLATILE (newdecl))
1786 TREE_THIS_VOLATILE (olddecl) = 1;
1787 if (TREE_NOTHROW (newdecl))
1788 TREE_NOTHROW (olddecl) = 1;
1790 /* Merge deprecatedness. */
1791 if (TREE_DEPRECATED (newdecl))
1792 TREE_DEPRECATED (olddecl) = 1;
1794 /* Preserve function specific target and optimization options */
1795 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1797 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1798 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1799 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1800 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1802 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1803 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1804 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1805 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1808 /* Merge the initialization information. */
1809 if (DECL_INITIAL (newdecl) == NULL_TREE
1810 && DECL_INITIAL (olddecl) != NULL_TREE)
1812 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1813 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1814 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1816 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1817 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1821 /* Merge the section attribute.
1822 We want to issue an error if the sections conflict but that must be
1823 done later in decl_attributes since we are called before attributes
1825 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1826 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1828 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1830 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1831 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1832 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1833 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1834 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1835 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1836 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1837 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1838 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1839 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1840 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1841 /* Keep the old RTL. */
1842 COPY_DECL_RTL (olddecl, newdecl);
1844 else if (TREE_CODE (newdecl) == VAR_DECL
1845 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1847 /* Keep the old RTL. We cannot keep the old RTL if the old
1848 declaration was for an incomplete object and the new
1849 declaration is not since many attributes of the RTL will
1851 COPY_DECL_RTL (olddecl, newdecl);
1854 /* If cannot merge, then use the new type and qualifiers,
1855 and don't preserve the old rtl. */
1858 /* Clean out any memory we had of the old declaration. */
1859 tree oldstatic = value_member (olddecl, static_aggregates);
1861 TREE_VALUE (oldstatic) = error_mark_node;
1863 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1864 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1865 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1866 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1869 /* Merge the storage class information. */
1870 merge_weak (newdecl, olddecl);
1872 if (DECL_ONE_ONLY (olddecl))
1873 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1875 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1876 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1877 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1878 if (! DECL_EXTERNAL (olddecl))
1879 DECL_EXTERNAL (newdecl) = 0;
1881 new_template_info = NULL_TREE;
1882 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1884 bool new_redefines_gnu_inline = false;
1886 if (new_defines_function
1887 && ((DECL_INTERFACE_KNOWN (olddecl)
1888 && TREE_CODE (olddecl) == FUNCTION_DECL)
1889 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1890 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1891 == FUNCTION_DECL))))
1895 if (TREE_CODE (fn) == TEMPLATE_DECL)
1896 fn = DECL_TEMPLATE_RESULT (olddecl);
1898 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1901 if (!new_redefines_gnu_inline)
1903 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1904 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1905 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1907 DECL_TEMPLATE_INSTANTIATED (newdecl)
1908 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1909 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1911 /* If the OLDDECL is an instantiation and/or specialization,
1912 then the NEWDECL must be too. But, it may not yet be marked
1913 as such if the caller has created NEWDECL, but has not yet
1914 figured out that it is a redeclaration. */
1915 if (!DECL_USE_TEMPLATE (newdecl))
1916 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1918 /* Don't really know how much of the language-specific
1919 values we should copy from old to new. */
1920 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1921 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1922 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1923 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1925 if (LANG_DECL_HAS_MIN (newdecl))
1927 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1928 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1929 if (DECL_TEMPLATE_INFO (newdecl))
1930 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1931 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1933 /* Only functions have these fields. */
1934 if (TREE_CODE (newdecl) == FUNCTION_DECL
1935 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1937 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1938 olddecl_friend = DECL_FRIEND_P (olddecl);
1939 hidden_friend = (DECL_ANTICIPATED (olddecl)
1940 && DECL_HIDDEN_FRIEND_P (olddecl)
1941 && newdecl_is_friend);
1942 DECL_BEFRIENDING_CLASSES (newdecl)
1943 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1944 DECL_BEFRIENDING_CLASSES (olddecl));
1945 /* DECL_THUNKS is only valid for virtual functions,
1946 otherwise it is a DECL_FRIEND_CONTEXT. */
1947 if (DECL_VIRTUAL_P (newdecl))
1948 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1950 /* Only variables have this field. */
1951 else if (TREE_CODE (newdecl) == VAR_DECL
1952 && VAR_HAD_UNKNOWN_BOUND (olddecl))
1953 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
1956 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1960 /* Merge parameter attributes. */
1961 tree oldarg, newarg;
1962 for (oldarg = DECL_ARGUMENTS(olddecl),
1963 newarg = DECL_ARGUMENTS(newdecl);
1965 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1966 DECL_ATTRIBUTES (newarg)
1967 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1968 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1971 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1972 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1974 /* If newdecl is not a specialization, then it is not a
1975 template-related function at all. And that means that we
1976 should have exited above, returning 0. */
1977 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1979 if (DECL_ODR_USED (olddecl))
1980 /* From [temp.expl.spec]:
1982 If a template, a member template or the member of a class
1983 template is explicitly specialized then that
1984 specialization shall be declared before the first use of
1985 that specialization that would cause an implicit
1986 instantiation to take place, in every translation unit in
1987 which such a use occurs. */
1988 error ("explicit specialization of %qD after first use",
1991 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1993 /* Don't propagate visibility from the template to the
1994 specialization here. We'll do that in determine_visibility if
1996 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1998 /* [temp.expl.spec/14] We don't inline explicit specialization
1999 just because the primary template says so. */
2001 else if (new_defines_function && DECL_INITIAL (olddecl))
2003 /* Never inline re-defined extern inline functions.
2004 FIXME: this could be better handled by keeping both
2005 function as separate declarations. */
2006 DECL_UNINLINABLE (newdecl) = 1;
2010 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2011 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2013 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2015 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2016 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2018 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2019 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2020 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2021 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2024 /* Preserve abstractness on cloned [cd]tors. */
2025 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2027 /* Update newdecl's parms to point at olddecl. */
2028 for (parm = DECL_ARGUMENTS (newdecl); parm;
2029 parm = TREE_CHAIN (parm))
2030 DECL_CONTEXT (parm) = olddecl;
2034 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2035 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2036 COPY_DECL_RTL (newdecl, olddecl);
2038 if (! types_match || new_defines_function)
2040 /* These need to be copied so that the names are available.
2041 Note that if the types do match, we'll preserve inline
2042 info and other bits, but if not, we won't. */
2043 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2044 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2046 if (new_defines_function)
2047 /* If defining a function declared with other language
2048 linkage, use the previously declared language linkage. */
2049 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2050 else if (types_match)
2052 /* If redeclaring a builtin function, and not a definition,
2053 it stays built in. */
2054 if (DECL_BUILT_IN (olddecl))
2056 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2057 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2058 /* If we're keeping the built-in definition, keep the rtl,
2059 regardless of declaration matches. */
2060 COPY_DECL_RTL (olddecl, newdecl);
2063 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2064 /* Don't clear out the arguments if we're just redeclaring a
2066 if (DECL_ARGUMENTS (olddecl))
2067 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2070 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2071 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2073 /* Now preserve various other info from the definition. */
2074 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2075 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2076 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2077 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2079 /* Warn about conflicting visibility specifications. */
2080 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2081 && DECL_VISIBILITY_SPECIFIED (newdecl)
2082 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2084 warning_at (input_location, OPT_Wattributes,
2085 "%q+D: visibility attribute ignored because it", newdecl);
2086 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2087 "conflicts with previous declaration here");
2089 /* Choose the declaration which specified visibility. */
2090 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2092 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2093 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2095 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2096 so keep this behavior. */
2097 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2099 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2100 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2103 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2104 with that from NEWDECL below. */
2105 if (DECL_LANG_SPECIFIC (olddecl))
2107 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2108 != DECL_LANG_SPECIFIC (newdecl));
2109 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2112 /* Merge the USED information. */
2113 if (TREE_USED (olddecl))
2114 TREE_USED (newdecl) = 1;
2115 else if (TREE_USED (newdecl))
2116 TREE_USED (olddecl) = 1;
2117 if (TREE_CODE (newdecl) == VAR_DECL)
2119 if (DECL_READ_P (olddecl))
2120 DECL_READ_P (newdecl) = 1;
2121 else if (DECL_READ_P (newdecl))
2122 DECL_READ_P (olddecl) = 1;
2124 if (DECL_PRESERVE_P (olddecl))
2125 DECL_PRESERVE_P (newdecl) = 1;
2126 else if (DECL_PRESERVE_P (newdecl))
2127 DECL_PRESERVE_P (olddecl) = 1;
2129 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2133 function_size = sizeof (struct tree_decl_common);
2135 memcpy ((char *) olddecl + sizeof (struct tree_common),
2136 (char *) newdecl + sizeof (struct tree_common),
2137 function_size - sizeof (struct tree_common));
2139 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2140 (char *) newdecl + sizeof (struct tree_decl_common),
2141 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2142 if (new_template_info)
2143 /* If newdecl is a template instantiation, it is possible that
2144 the following sequence of events has occurred:
2146 o A friend function was declared in a class template. The
2147 class template was instantiated.
2149 o The instantiation of the friend declaration was
2150 recorded on the instantiation list, and is newdecl.
2152 o Later, however, instantiate_class_template called pushdecl
2153 on the newdecl to perform name injection. But, pushdecl in
2154 turn called duplicate_decls when it discovered that another
2155 declaration of a global function with the same name already
2158 o Here, in duplicate_decls, we decided to clobber newdecl.
2160 If we're going to do that, we'd better make sure that
2161 olddecl, and not newdecl, is on the list of
2162 instantiations so that if we try to do the instantiation
2163 again we won't get the clobbered declaration. */
2164 reregister_specialization (newdecl,
2170 size_t size = tree_code_size (TREE_CODE (olddecl));
2171 memcpy ((char *) olddecl + sizeof (struct tree_common),
2172 (char *) newdecl + sizeof (struct tree_common),
2173 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2174 switch (TREE_CODE (olddecl))
2184 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2185 (char *) newdecl + sizeof (struct tree_decl_common),
2186 size - sizeof (struct tree_decl_common)
2187 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2191 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2192 (char *) newdecl + sizeof (struct tree_decl_common),
2193 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2194 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2198 DECL_UID (olddecl) = olddecl_uid;
2200 DECL_FRIEND_P (olddecl) = 1;
2203 DECL_ANTICIPATED (olddecl) = 1;
2204 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2207 /* NEWDECL contains the merged attribute lists.
2208 Update OLDDECL to be the same. */
2209 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2211 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2212 so that encode_section_info has a chance to look at the new decl
2213 flags and attributes. */
2214 if (DECL_RTL_SET_P (olddecl)
2215 && (TREE_CODE (olddecl) == FUNCTION_DECL
2216 || (TREE_CODE (olddecl) == VAR_DECL
2217 && TREE_STATIC (olddecl))))
2218 make_decl_rtl (olddecl);
2220 /* The NEWDECL will no longer be needed. Because every out-of-class
2221 declaration of a member results in a call to duplicate_decls,
2222 freeing these nodes represents in a significant savings. */
2228 /* Return zero if the declaration NEWDECL is valid
2229 when the declaration OLDDECL (assumed to be for the same name)
2230 has already been seen.
2231 Otherwise return an error message format string with a %s
2232 where the identifier should go. */
2235 redeclaration_error_message (tree newdecl, tree olddecl)
2237 if (TREE_CODE (newdecl) == TYPE_DECL)
2239 /* Because C++ can put things into name space for free,
2240 constructs like "typedef struct foo { ... } foo"
2241 would look like an erroneous redeclaration. */
2242 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2245 return G_("redefinition of %q#D");
2247 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2249 /* If this is a pure function, its olddecl will actually be
2250 the original initialization to `0' (which we force to call
2251 abort()). Don't complain about redefinition in this case. */
2252 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2253 && DECL_INITIAL (olddecl) == NULL_TREE)
2256 /* If both functions come from different namespaces, this is not
2257 a redeclaration - this is a conflict with a used function. */
2258 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2259 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2260 && ! decls_match (olddecl, newdecl))
2261 return G_("%qD conflicts with used function");
2263 /* We'll complain about linkage mismatches in
2264 warn_extern_redeclared_static. */
2266 /* Defining the same name twice is no good. */
2267 if (DECL_INITIAL (olddecl) != NULL_TREE
2268 && DECL_INITIAL (newdecl) != NULL_TREE)
2270 if (DECL_NAME (olddecl) == NULL_TREE)
2271 return G_("%q#D not declared in class");
2272 else if (!GNU_INLINE_P (olddecl)
2273 || GNU_INLINE_P (newdecl))
2274 return G_("redefinition of %q#D");
2277 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2279 bool olda = GNU_INLINE_P (olddecl);
2280 bool newa = GNU_INLINE_P (newdecl);
2285 return G_("%q+D redeclared inline with "
2286 "%<gnu_inline%> attribute");
2288 return G_("%q+D redeclared inline without "
2289 "%<gnu_inline%> attribute");
2295 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2299 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2301 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2302 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2303 return G_("redefinition of %q#D");
2307 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2308 || (DECL_TEMPLATE_RESULT (newdecl)
2309 == DECL_TEMPLATE_RESULT (olddecl)))
2312 nt = DECL_TEMPLATE_RESULT (newdecl);
2313 if (DECL_TEMPLATE_INFO (nt))
2314 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2315 ot = DECL_TEMPLATE_RESULT (olddecl);
2316 if (DECL_TEMPLATE_INFO (ot))
2317 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2318 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2319 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2320 return G_("redefinition of %q#D");
2322 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2324 bool olda = GNU_INLINE_P (ot);
2325 bool newa = GNU_INLINE_P (nt);
2330 return G_("%q+D redeclared inline with "
2331 "%<gnu_inline%> attribute");
2333 return G_("%q+D redeclared inline without "
2334 "%<gnu_inline%> attribute");
2338 /* Core issue #226 (C++0x):
2340 If a friend function template declaration specifies a
2341 default template-argument, that declaration shall be a
2342 definition and shall be the only declaration of the
2343 function template in the translation unit. */
2344 if ((cxx_dialect != cxx98)
2345 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2346 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2347 /*is_primary=*/1, /*is_partial=*/0,
2348 /*is_friend_decl=*/2))
2349 return G_("redeclaration of friend %q#D "
2350 "may not have default template arguments");
2354 else if (TREE_CODE (newdecl) == VAR_DECL
2355 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2356 && (! DECL_LANG_SPECIFIC (olddecl)
2357 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2358 || DECL_THREAD_LOCAL_P (newdecl)))
2360 /* Only variables can be thread-local, and all declarations must
2361 agree on this property. */
2362 if (DECL_THREAD_LOCAL_P (newdecl))
2363 return G_("thread-local declaration of %q#D follows "
2364 "non-thread-local declaration");
2366 return G_("non-thread-local declaration of %q#D follows "
2367 "thread-local declaration");
2369 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2371 /* The objects have been declared at namespace scope. If either
2372 is a member of an anonymous union, then this is an invalid
2373 redeclaration. For example:
2379 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2380 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2381 return G_("redeclaration of %q#D");
2382 /* If at least one declaration is a reference, there is no
2383 conflict. For example:
2389 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2391 /* Reject two definitions. */
2392 return G_("redefinition of %q#D");
2396 /* Objects declared with block scope: */
2397 /* Reject two definitions, and reject a definition
2398 together with an external reference. */
2399 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2400 return G_("redeclaration of %q#D");
2405 /* Hash and equality functions for the named_label table. */
2408 named_label_entry_hash (const void *data)
2410 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2411 return DECL_UID (ent->label_decl);
2415 named_label_entry_eq (const void *a, const void *b)
2417 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2418 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2419 return ent_a->label_decl == ent_b->label_decl;
2422 /* Create a new label, named ID. */
2425 make_label_decl (tree id, int local_p)
2427 struct named_label_entry *ent;
2431 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2433 DECL_CONTEXT (decl) = current_function_decl;
2434 DECL_MODE (decl) = VOIDmode;
2435 C_DECLARED_LABEL_FLAG (decl) = local_p;
2437 /* Say where one reference is to the label, for the sake of the
2438 error if it is not defined. */
2439 DECL_SOURCE_LOCATION (decl) = input_location;
2441 /* Record the fact that this identifier is bound to this label. */
2442 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2444 /* Create the label htab for the function on demand. */
2446 named_labels = htab_create_ggc (13, named_label_entry_hash,
2447 named_label_entry_eq, NULL);
2449 /* Record this label on the list of labels used in this function.
2450 We do this before calling make_label_decl so that we get the
2451 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2452 ent = GGC_CNEW (struct named_label_entry);
2453 ent->label_decl = decl;
2455 slot = htab_find_slot (named_labels, ent, INSERT);
2456 gcc_assert (*slot == NULL);
2462 /* Look for a label named ID in the current function. If one cannot
2463 be found, create one. (We keep track of used, but undefined,
2464 labels, and complain about them at the end of a function.) */
2467 lookup_label (tree id)
2471 timevar_push (TV_NAME_LOOKUP);
2472 /* You can't use labels at global scope. */
2473 if (current_function_decl == NULL_TREE)
2475 error ("label %qE referenced outside of any function", id);
2476 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2479 /* See if we've already got this label. */
2480 decl = IDENTIFIER_LABEL_VALUE (id);
2481 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2482 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2484 decl = make_label_decl (id, /*local_p=*/0);
2485 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2488 /* Declare a local label named ID. */
2491 declare_local_label (tree id)
2495 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2496 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2497 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2498 current_binding_level->shadowed_labels);
2499 current_binding_level->shadowed_labels = shadow;
2501 decl = make_label_decl (id, /*local_p=*/1);
2502 TREE_VALUE (shadow) = decl;
2507 /* Returns nonzero if it is ill-formed to jump past the declaration of
2508 DECL. Returns 2 if it's also a real problem. */
2511 decl_jump_unsafe (tree decl)
2513 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2514 with automatic storage duration is not in scope to a point where it is
2515 in scope is ill-formed unless the variable has scalar type, class type
2516 with a trivial default constructor and a trivial destructor, a
2517 cv-qualified version of one of these types, or an array of one of the
2518 preceding types and is declared without an initializer (8.5). */
2519 tree type = TREE_TYPE (decl);
2521 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2522 || type == error_mark_node)
2525 type = strip_array_types (type);
2527 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2528 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2531 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2537 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2540 identify_goto (tree decl, const location_t *locus)
2543 permerror (input_location, "jump to label %qD", decl);
2545 permerror (input_location, "jump to case label");
2547 permerror (*locus, " from here");
2550 /* Check that a single previously seen jump to a newly defined label
2551 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2552 the jump context; NAMES are the names in scope in LEVEL at the jump
2553 context; LOCUS is the source position of the jump or 0. Returns
2554 true if all is well. */
2557 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2558 bool exited_omp, const location_t *locus)
2560 struct cp_binding_level *b;
2561 bool identified = false, saw_eh = false, saw_omp = false;
2565 identify_goto (decl, locus);
2566 error (" exits OpenMP structured block");
2567 identified = saw_omp = true;
2570 for (b = current_binding_level; b ; b = b->level_chain)
2572 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2574 for (new_decls = b->names; new_decls != old_decls;
2575 new_decls = TREE_CHAIN (new_decls))
2577 int problem = decl_jump_unsafe (new_decls);
2583 identify_goto (decl, locus);
2587 error (" crosses initialization of %q+#D", new_decls);
2589 permerror (input_location, " enters scope of %q+#D which has "
2590 "non-trivial destructor", new_decls);
2595 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2599 identify_goto (decl, locus);
2602 if (b->kind == sk_try)
2603 error (" enters try block");
2605 error (" enters catch block");
2608 if (b->kind == sk_omp && !saw_omp)
2612 identify_goto (decl, locus);
2615 error (" enters OpenMP structured block");
2624 check_previous_goto (tree decl, struct named_label_use_entry *use)
2626 check_previous_goto_1 (decl, use->binding_level,
2627 use->names_in_scope, use->in_omp_scope,
2628 &use->o_goto_locus);
2632 check_switch_goto (struct cp_binding_level* level)
2634 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2637 /* Check that a new jump to a label DECL is OK. Called by
2638 finish_goto_stmt. */
2641 check_goto (tree decl)
2643 struct named_label_entry *ent, dummy;
2644 bool saw_catch = false, identified = false;
2647 /* We can't know where a computed goto is jumping.
2648 So we assume that it's OK. */
2649 if (TREE_CODE (decl) != LABEL_DECL)
2652 /* We didn't record any information about this label when we created it,
2653 and there's not much point since it's trivial to analyze as a return. */
2654 if (decl == cdtor_label)
2657 dummy.label_decl = decl;
2658 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2659 gcc_assert (ent != NULL);
2661 /* If the label hasn't been defined yet, defer checking. */
2662 if (! DECL_INITIAL (decl))
2664 struct named_label_use_entry *new_use;
2666 /* Don't bother creating another use if the last goto had the
2667 same data, and will therefore create the same set of errors. */
2669 && ent->uses->names_in_scope == current_binding_level->names)
2672 new_use = GGC_NEW (struct named_label_use_entry);
2673 new_use->binding_level = current_binding_level;
2674 new_use->names_in_scope = current_binding_level->names;
2675 new_use->o_goto_locus = input_location;
2676 new_use->in_omp_scope = false;
2678 new_use->next = ent->uses;
2679 ent->uses = new_use;
2683 if (ent->in_try_scope || ent->in_catch_scope
2684 || ent->in_omp_scope || ent->bad_decls)
2686 permerror (input_location, "jump to label %q+D", decl);
2687 permerror (input_location, " from here");
2691 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2693 tree b = TREE_VALUE (bad);
2694 int u = decl_jump_unsafe (b);
2696 if (u > 1 && DECL_ARTIFICIAL (b))
2698 /* Can't skip init of __exception_info. */
2699 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2703 error (" skips initialization of %q+#D", b);
2705 permerror (input_location, " enters scope of %q+#D which has "
2706 "non-trivial destructor", b);
2709 if (ent->in_try_scope)
2710 error (" enters try block");
2711 else if (ent->in_catch_scope && !saw_catch)
2712 error (" enters catch block");
2714 if (ent->in_omp_scope)
2715 error (" enters OpenMP structured block");
2716 else if (flag_openmp)
2718 struct cp_binding_level *b;
2719 for (b = current_binding_level; b ; b = b->level_chain)
2721 if (b == ent->binding_level)
2723 if (b->kind == sk_omp)
2727 permerror (input_location, "jump to label %q+D", decl);
2728 permerror (input_location, " from here");
2731 error (" exits OpenMP structured block");
2738 /* Check that a return is ok wrt OpenMP structured blocks.
2739 Called by finish_return_stmt. Returns true if all is well. */
2742 check_omp_return (void)
2744 struct cp_binding_level *b;
2745 for (b = current_binding_level; b ; b = b->level_chain)
2746 if (b->kind == sk_omp)
2748 error ("invalid exit from OpenMP structured block");
2754 /* Define a label, specifying the location in the source file.
2755 Return the LABEL_DECL node for the label. */
2758 define_label (location_t location, tree name)
2760 struct named_label_entry *ent, dummy;
2761 struct cp_binding_level *p;
2764 timevar_push (TV_NAME_LOOKUP);
2766 decl = lookup_label (name);
2768 dummy.label_decl = decl;
2769 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2770 gcc_assert (ent != NULL);
2772 /* After labels, make any new cleanups in the function go into their
2773 own new (temporary) binding contour. */
2774 for (p = current_binding_level;
2775 p->kind != sk_function_parms;
2777 p->more_cleanups_ok = 0;
2779 if (name == get_identifier ("wchar_t"))
2780 permerror (input_location, "label named wchar_t");
2782 if (DECL_INITIAL (decl) != NULL_TREE)
2784 error ("duplicate label %qD", decl);
2785 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2789 struct named_label_use_entry *use;
2791 /* Mark label as having been defined. */
2792 DECL_INITIAL (decl) = error_mark_node;
2793 /* Say where in the source. */
2794 DECL_SOURCE_LOCATION (decl) = location;
2796 ent->binding_level = current_binding_level;
2797 ent->names_in_scope = current_binding_level->names;
2799 for (use = ent->uses; use ; use = use->next)
2800 check_previous_goto (decl, use);
2804 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2809 struct cp_binding_level *level;
2810 struct cp_switch *next;
2811 /* The SWITCH_STMT being built. */
2813 /* A splay-tree mapping the low element of a case range to the high
2814 element, or NULL_TREE if there is no high element. Used to
2815 determine whether or not a new case label duplicates an old case
2816 label. We need a tree, rather than simply a hash table, because
2817 of the GNU case range extension. */
2821 /* A stack of the currently active switch statements. The innermost
2822 switch statement is on the top of the stack. There is no need to
2823 mark the stack for garbage collection because it is only active
2824 during the processing of the body of a function, and we never
2825 collect at that point. */
2827 static struct cp_switch *switch_stack;
2829 /* Called right after a switch-statement condition is parsed.
2830 SWITCH_STMT is the switch statement being parsed. */
2833 push_switch (tree switch_stmt)
2835 struct cp_switch *p = XNEW (struct cp_switch);
2836 p->level = current_binding_level;
2837 p->next = switch_stack;
2838 p->switch_stmt = switch_stmt;
2839 p->cases = splay_tree_new (case_compare, NULL, NULL);
2846 struct cp_switch *cs = switch_stack;
2847 location_t switch_location;
2849 /* Emit warnings as needed. */
2850 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2851 switch_location = EXPR_LOCATION (cs->switch_stmt);
2853 switch_location = input_location;
2854 if (!processing_template_decl)
2855 c_do_switch_warnings (cs->cases, switch_location,
2856 SWITCH_STMT_TYPE (cs->switch_stmt),
2857 SWITCH_STMT_COND (cs->switch_stmt));
2859 splay_tree_delete (cs->cases);
2860 switch_stack = switch_stack->next;
2864 /* Note that we've seen a definition of a case label, and complain if this
2865 is a bad place for one. */
2868 finish_case_label (location_t loc, tree low_value, tree high_value)
2871 struct cp_binding_level *p;
2873 if (processing_template_decl)
2877 /* For templates, just add the case label; we'll do semantic
2878 analysis at instantiation-time. */
2879 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2880 return add_stmt (build_case_label (loc, low_value, high_value, label));
2883 /* Find the condition on which this switch statement depends. */
2884 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2885 if (cond && TREE_CODE (cond) == TREE_LIST)
2886 cond = TREE_VALUE (cond);
2888 if (!check_switch_goto (switch_stack->level))
2889 return error_mark_node;
2891 r = c_add_case_label (loc, switch_stack->cases, cond,
2892 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2893 low_value, high_value);
2895 /* After labels, make any new cleanups in the function go into their
2896 own new (temporary) binding contour. */
2897 for (p = current_binding_level;
2898 p->kind != sk_function_parms;
2900 p->more_cleanups_ok = 0;
2905 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2908 typename_hash (const void* k)
2911 const_tree const t = (const_tree) k;
2913 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2914 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2919 typedef struct typename_info {
2927 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2928 really of type `typename_info*' */
2931 typename_compare (const void * k1, const void * k2)
2933 const_tree const t1 = (const_tree) k1;
2934 const typename_info *const t2 = (const typename_info *) k2;
2936 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2937 && TYPE_CONTEXT (t1) == t2->scope
2938 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2939 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2940 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2943 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2944 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2946 Returns the new TYPENAME_TYPE. */
2948 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2951 build_typename_type (tree context, tree name, tree fullname,
2952 enum tag_types tag_type)
2960 if (typename_htab == NULL)
2961 typename_htab = htab_create_ggc (61, &typename_hash,
2962 &typename_compare, NULL);
2964 ti.scope = FROB_CONTEXT (context);
2966 ti.template_id = fullname;
2967 ti.enum_p = tag_type == enum_type;
2968 ti.class_p = (tag_type == class_type
2969 || tag_type == record_type
2970 || tag_type == union_type);
2971 hash = (htab_hash_pointer (ti.scope)
2972 ^ htab_hash_pointer (ti.name));
2974 /* See if we already have this type. */
2975 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2980 /* Build the TYPENAME_TYPE. */
2981 t = cxx_make_type (TYPENAME_TYPE);
2982 TYPE_CONTEXT (t) = ti.scope;
2983 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2984 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2985 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2987 /* Build the corresponding TYPE_DECL. */
2988 d = build_decl (input_location, TYPE_DECL, name, t);
2989 TYPE_NAME (TREE_TYPE (d)) = d;
2990 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2991 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2992 DECL_ARTIFICIAL (d) = 1;
2994 /* Store it in the hash table. */
2997 /* TYPENAME_TYPEs must always be compared structurally, because
2998 they may or may not resolve down to another type depending on
2999 the currently open classes. */
3000 SET_TYPE_STRUCTURAL_EQUALITY (t);
3006 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3007 provided to name the type. Returns an appropriate type, unless an
3008 error occurs, in which case error_mark_node is returned. If we
3009 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3010 return that, rather than the _TYPE it corresponds to, in other
3011 cases we look through the type decl. If TF_ERROR is set, complain
3012 about errors, otherwise be quiet. */
3015 make_typename_type (tree context, tree name, enum tag_types tag_type,
3016 tsubst_flags_t complain)
3022 if (name == error_mark_node
3023 || context == NULL_TREE
3024 || context == error_mark_node)
3025 return error_mark_node;
3029 if (!(TYPE_LANG_SPECIFIC (name)
3030 && (CLASSTYPE_IS_TEMPLATE (name)
3031 || CLASSTYPE_USE_TEMPLATE (name))))
3032 name = TYPE_IDENTIFIER (name);
3034 /* Create a TEMPLATE_ID_EXPR for the type. */
3035 name = build_nt (TEMPLATE_ID_EXPR,
3036 CLASSTYPE_TI_TEMPLATE (name),
3037 CLASSTYPE_TI_ARGS (name));
3039 else if (TREE_CODE (name) == TYPE_DECL)
3040 name = DECL_NAME (name);
3044 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3046 name = TREE_OPERAND (name, 0);
3047 if (TREE_CODE (name) == TEMPLATE_DECL)
3048 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3049 else if (TREE_CODE (name) == OVERLOAD)
3051 error ("%qD is not a type", name);
3052 return error_mark_node;
3055 if (TREE_CODE (name) == TEMPLATE_DECL)
3057 error ("%qD used without template parameters", name);
3058 return error_mark_node;
3060 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3061 gcc_assert (TYPE_P (context));
3063 if (!MAYBE_CLASS_TYPE_P (context))
3065 if (complain & tf_error)
3066 error ("%q#T is not a class", context);
3067 return error_mark_node;
3070 /* When the CONTEXT is a dependent type, NAME could refer to a
3071 dependent base class of CONTEXT. But look inside it anyway
3072 if CONTEXT is a currently open scope, in case it refers to a
3073 member of the current instantiation or a non-dependent base;
3074 lookup will stop when we hit a dependent base. */
3075 if (!dependent_scope_p (context))
3076 /* We should only set WANT_TYPE when we're a nested typename type.
3077 Then we can give better diagnostics if we find a non-type. */
3078 t = lookup_field (context, name, 2, /*want_type=*/true);
3082 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3083 return build_typename_type (context, name, fullname, tag_type);
3085 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3089 if (complain & tf_error)
3090 error (want_template ? "no class template named %q#T in %q#T"
3091 : "no type named %q#T in %q#T", name, context);
3092 return error_mark_node;
3095 /* Pull out the template from an injected-class-name (or multiple). */
3097 t = maybe_get_template_decl_from_type_decl (t);
3099 if (TREE_CODE (t) == TREE_LIST)
3101 if (complain & tf_error)
3103 error ("lookup of %qT in %qT is ambiguous", name, context);
3104 print_candidates (t);
3106 return error_mark_node;
3109 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3111 if (complain & tf_error)
3112 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3114 return error_mark_node;
3116 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3118 if (complain & tf_error)
3119 error ("%<typename %T::%D%> names %q#T, which is not a type",
3121 return error_mark_node;
3124 if (complain & tf_error)
3125 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3127 /* If we are currently parsing a template and if T is a typedef accessed
3128 through CONTEXT then we need to remember and check access of T at
3129 template instantiation time. */
3130 add_typedef_to_current_template_for_access_check (t, context, input_location);
3133 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3135 /*entering_scope=*/0,
3136 tf_warning_or_error | tf_user);
3138 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3144 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3145 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3146 in which case error_mark_node is returned.
3148 If PARM_LIST is non-NULL, also make sure that the template parameter
3149 list of TEMPLATE_DECL matches.
3151 If COMPLAIN zero, don't complain about any errors that occur. */
3154 make_unbound_class_template (tree context, tree name, tree parm_list,
3155 tsubst_flags_t complain)
3161 name = TYPE_IDENTIFIER (name);
3162 else if (DECL_P (name))
3163 name = DECL_NAME (name);
3164 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3166 if (!dependent_type_p (context)
3167 || currently_open_class (context))
3169 tree tmpl = NULL_TREE;
3171 if (MAYBE_CLASS_TYPE_P (context))
3172 tmpl = lookup_field (context, name, 0, false);
3174 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3176 if (complain & tf_error)
3177 error ("no class template named %q#T in %q#T", name, context);
3178 return error_mark_node;
3182 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3184 if (complain & tf_error)
3186 error ("template parameters do not match template");
3187 error ("%q+D declared here", tmpl);
3189 return error_mark_node;
3192 if (complain & tf_error)
3193 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3198 /* Build the UNBOUND_CLASS_TEMPLATE. */
3199 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3200 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3201 TREE_TYPE (t) = NULL_TREE;
3202 SET_TYPE_STRUCTURAL_EQUALITY (t);
3204 /* Build the corresponding TEMPLATE_DECL. */
3205 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3206 TYPE_NAME (TREE_TYPE (d)) = d;
3207 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3208 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3209 DECL_ARTIFICIAL (d) = 1;
3210 DECL_TEMPLATE_PARMS (d) = parm_list;
3217 /* Push the declarations of builtin types into the namespace.
3218 RID_INDEX is the index of the builtin type in the array
3219 RID_POINTERS. NAME is the name used when looking up the builtin
3220 type. TYPE is the _TYPE node for the builtin type. */
3223 record_builtin_type (enum rid rid_index,
3227 tree rname = NULL_TREE, tname = NULL_TREE;
3228 tree tdecl = NULL_TREE;
3230 if ((int) rid_index < (int) RID_MAX)
3231 rname = ridpointers[(int) rid_index];
3233 tname = get_identifier (name);
3235 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3236 eliminated. Built-in types should not be looked up name; their
3237 names are keywords that the parser can recognize. However, there
3238 is code in c-common.c that uses identifier_global_value to look
3239 up built-in types by name. */
3242 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3243 DECL_ARTIFICIAL (tdecl) = 1;
3244 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3250 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3251 DECL_ARTIFICIAL (tdecl) = 1;
3253 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3256 if (!TYPE_NAME (type))
3257 TYPE_NAME (type) = tdecl;
3260 debug_hooks->type_decl (tdecl, 0);
3263 /* Record one of the standard Java types.
3264 * Declare it as having the given NAME.
3265 * If SIZE > 0, it is the size of one of the integral types;
3266 * otherwise it is the negative of the size of one of the other types. */
3269 record_builtin_java_type (const char* name, int size)
3273 type = build_nonstandard_integer_type (size, 0);
3274 else if (size > -32)
3277 /* "__java_char" or ""__java_boolean". */
3278 type = build_nonstandard_integer_type (-size, 1);
3279 /* Get the signed type cached and attached to the unsigned type,
3280 so it doesn't get garbage-collected at "random" times,
3281 causing potential codegen differences out of different UIDs
3282 and different alias set numbers. */
3283 stype = build_nonstandard_integer_type (-size, 0);
3284 TREE_CHAIN (type) = stype;
3285 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3288 { /* "__java_float" or ""__java_double". */
3289 type = make_node (REAL_TYPE);
3290 TYPE_PRECISION (type) = - size;
3293 record_builtin_type (RID_MAX, name, type);
3294 decl = TYPE_NAME (type);
3296 /* Suppress generate debug symbol entries for these types,
3297 since for normal C++ they are just clutter.
3298 However, push_lang_context undoes this if extern "Java" is seen. */
3299 DECL_IGNORED_P (decl) = 1;
3301 TYPE_FOR_JAVA (type) = 1;
3305 /* Push a type into the namespace so that the back ends ignore it. */
3308 record_unknown_type (tree type, const char* name)
3310 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3311 TYPE_DECL, get_identifier (name), type));
3312 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3313 DECL_IGNORED_P (decl) = 1;
3314 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3315 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3316 TYPE_ALIGN (type) = 1;
3317 TYPE_USER_ALIGN (type) = 0;
3318 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3321 /* A string for which we should create an IDENTIFIER_NODE at
3324 typedef struct predefined_identifier
3326 /* The name of the identifier. */
3327 const char *const name;
3328 /* The place where the IDENTIFIER_NODE should be stored. */
3330 /* Nonzero if this is the name of a constructor or destructor. */
3331 const int ctor_or_dtor_p;
3332 } predefined_identifier;
3334 /* Create all the predefined identifiers. */
3337 initialize_predefined_identifiers (void)
3339 const predefined_identifier *pid;
3341 /* A table of identifiers to create at startup. */
3342 static const predefined_identifier predefined_identifiers[] = {
3343 { "C++", &lang_name_cplusplus, 0 },
3344 { "C", &lang_name_c, 0 },
3345 { "Java", &lang_name_java, 0 },
3346 /* Some of these names have a trailing space so that it is
3347 impossible for them to conflict with names written by users. */
3348 { "__ct ", &ctor_identifier, 1 },
3349 { "__base_ctor ", &base_ctor_identifier, 1 },
3350 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3351 { "__dt ", &dtor_identifier, 1 },
3352 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3353 { "__base_dtor ", &base_dtor_identifier, 1 },
3354 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3355 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3356 { "nelts", &nelts_identifier, 0 },
3357 { THIS_NAME, &this_identifier, 0 },
3358 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3359 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3360 { "_vptr", &vptr_identifier, 0 },
3361 { "__vtt_parm", &vtt_parm_identifier, 0 },
3362 { "::", &global_scope_name, 0 },
3363 { "std", &std_identifier, 0 },
3367 for (pid = predefined_identifiers; pid->name; ++pid)
3369 *pid->node = get_identifier (pid->name);
3370 if (pid->ctor_or_dtor_p)
3371 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3375 /* Create the predefined scalar types of C,
3376 and some nodes representing standard constants (0, 1, (void *)0).
3377 Initialize the global binding level.
3378 Make definitions for built-in primitive functions. */
3381 cxx_init_decl_processing (void)
3384 tree void_ftype_ptr;
3386 build_common_tree_nodes (flag_signed_char);
3388 /* Create all the identifiers we need. */
3389 initialize_predefined_identifiers ();
3391 /* Create the global variables. */
3392 push_to_top_level ();
3394 current_function_decl = NULL_TREE;
3395 current_binding_level = NULL;
3396 /* Enter the global namespace. */
3397 gcc_assert (global_namespace == NULL_TREE);
3398 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3400 TREE_PUBLIC (global_namespace) = 1;
3401 begin_scope (sk_namespace, global_namespace);
3403 current_lang_name = NULL_TREE;
3405 if (flag_visibility_ms_compat)
3406 default_visibility = VISIBILITY_HIDDEN;
3409 current_lang_name = lang_name_c;
3411 /* Create the `std' namespace. */
3412 push_namespace (std_identifier);
3413 std_node = current_namespace;
3416 c_common_nodes_and_builtins ();
3418 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3419 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3420 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3421 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3422 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3423 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3424 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3425 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3427 integer_two_node = build_int_cst (NULL_TREE, 2);
3428 integer_three_node = build_int_cst (NULL_TREE, 3);
3430 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3431 truthvalue_type_node = boolean_type_node;
3432 truthvalue_false_node = boolean_false_node;
3433 truthvalue_true_node = boolean_true_node;
3435 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3438 record_builtin_type (RID_MAX, NULL, string_type_node);
3441 delta_type_node = ptrdiff_type_node;
3442 vtable_index_type = ptrdiff_type_node;
3444 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3445 void_ftype = build_function_type (void_type_node, void_list_node);
3446 void_ftype_ptr = build_function_type (void_type_node,
3447 tree_cons (NULL_TREE,
3451 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3453 /* C++ extensions */
3455 unknown_type_node = make_node (UNKNOWN_TYPE);
3456 record_unknown_type (unknown_type_node, "unknown type");
3458 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3459 TREE_TYPE (unknown_type_node) = unknown_type_node;
3461 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3463 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3464 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3466 init_list_type_node = make_node (UNKNOWN_TYPE);
3467 record_unknown_type (init_list_type_node, "init list");
3470 /* Make sure we get a unique function type, so we can give
3471 its pointer type a name. (This wins for gdb.) */
3472 tree vfunc_type = make_node (FUNCTION_TYPE);
3473 TREE_TYPE (vfunc_type) = integer_type_node;
3474 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3475 layout_type (vfunc_type);
3477 vtable_entry_type = build_pointer_type (vfunc_type);
3479 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3482 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3483 layout_type (vtbl_type_node);
3484 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3485 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3486 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3487 layout_type (vtbl_ptr_type_node);
3488 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3490 push_namespace (get_identifier ("__cxxabiv1"));
3491 abi_node = current_namespace;
3494 global_type_node = make_node (LANG_TYPE);
3495 record_unknown_type (global_type_node, "global type");
3498 current_lang_name = lang_name_cplusplus;
3502 tree bad_alloc_type_node;
3503 tree bad_alloc_decl;
3504 tree newtype, deltype;
3505 tree ptr_ftype_sizetype;
3507 push_namespace (std_identifier);
3508 bad_alloc_id = get_identifier ("bad_alloc");
3509 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3510 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3512 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3513 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3517 = build_function_type (ptr_type_node,
3518 tree_cons (NULL_TREE,
3521 newtype = build_exception_variant
3522 (ptr_ftype_sizetype, add_exception_specifier
3523 (NULL_TREE, bad_alloc_type_node, -1));
3524 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3525 push_cp_library_fn (NEW_EXPR, newtype);
3526 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3527 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3528 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3531 tree nullptr_type_node = make_node (NULLPTR_TYPE);
3532 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3533 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3534 TYPE_UNSIGNED (nullptr_type_node) = 1;
3535 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3536 SET_TYPE_MODE (nullptr_type_node, Pmode);
3537 nullptr_node = make_node (INTEGER_CST);
3538 TREE_TYPE (nullptr_node) = nullptr_type_node;
3543 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3545 /* Perform other language dependent initializations. */
3546 init_class_processing ();
3547 init_rtti_processing ();
3548 init_template_processing ();
3550 if (flag_exceptions)
3551 init_exception_processing ();
3553 if (! supports_one_only ())
3556 make_fname_decl = cp_make_fname_decl;
3557 start_fname_decls ();
3559 /* Show we use EH for cleanups. */
3560 if (flag_exceptions)
3561 using_eh_for_cleanups ();
3564 /* Generate an initializer for a function naming variable from
3565 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3566 filled in with the type of the init. */
3569 cp_fname_init (const char* name, tree *type_p)
3571 tree domain = NULL_TREE;
3573 tree init = NULL_TREE;
3578 length = strlen (name);
3579 domain = build_index_type (size_int (length));
3580 init = build_string (length + 1, name);
3583 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3584 type = build_cplus_array_type (type, domain);
3589 TREE_TYPE (init) = type;
3591 init = error_mark_node;
3596 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3597 the decl, LOC is the location to give the decl, NAME is the
3598 initialization string and TYPE_DEP indicates whether NAME depended
3599 on the type of the function. We make use of that to detect
3600 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3601 at the point of first use, so we mustn't push the decl now. */
3604 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3606 const char *const name = (type_dep && processing_template_decl
3607 ? NULL : fname_as_string (type_dep));
3609 tree init = cp_fname_init (name, &type);
3610 tree decl = build_decl (loc, VAR_DECL, id, type);
3613 free (CONST_CAST (char *, name));
3615 /* As we're using pushdecl_with_scope, we must set the context. */
3616 DECL_CONTEXT (decl) = current_function_decl;
3617 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3619 TREE_STATIC (decl) = 1;
3620 TREE_READONLY (decl) = 1;
3621 DECL_ARTIFICIAL (decl) = 1;
3623 TREE_USED (decl) = 1;
3625 if (current_function_decl)
3627 struct cp_binding_level *b = current_binding_level;
3628 while (b->level_chain->kind != sk_function_parms)
3630 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3631 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3632 LOOKUP_ONLYCONVERTING);
3635 pushdecl_top_level_and_finish (decl, init);
3641 builtin_function_1 (tree decl, tree context, bool is_global)
3643 tree id = DECL_NAME (decl);
3644 const char *name = IDENTIFIER_POINTER (id);
3646 retrofit_lang_decl (decl);
3648 DECL_ARTIFICIAL (decl) = 1;
3649 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3650 SET_DECL_LANGUAGE (decl, lang_c);
3651 /* Runtime library routines are, by definition, available in an
3652 external shared object. */
3653 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3654 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3656 DECL_CONTEXT (decl) = context;
3659 pushdecl_top_level (decl);
3663 /* A function in the user's namespace should have an explicit
3664 declaration before it is used. Mark the built-in function as
3665 anticipated but not actually declared. */
3666 if (name[0] != '_' || name[1] != '_')
3667 DECL_ANTICIPATED (decl) = 1;
3668 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3670 size_t len = strlen (name);
3672 /* Treat __*_chk fortification functions as anticipated as well,
3673 unless they are __builtin_*. */
3674 if (len > strlen ("___chk")
3675 && memcmp (name + len - strlen ("_chk"),
3676 "_chk", strlen ("_chk") + 1) == 0)
3677 DECL_ANTICIPATED (decl) = 1;
3684 cxx_builtin_function (tree decl)
3686 tree id = DECL_NAME (decl);
3687 const char *name = IDENTIFIER_POINTER (id);
3688 /* All builtins that don't begin with an '_' should additionally
3689 go in the 'std' namespace. */
3692 tree decl2 = copy_node(decl);
3693 push_namespace (std_identifier);
3694 builtin_function_1 (decl2, std_node, false);
3698 return builtin_function_1 (decl, NULL_TREE, false);
3701 /* Like cxx_builtin_function, but guarantee the function is added to the global
3702 scope. This is to allow function specific options to add new machine
3703 dependent builtins when the target ISA changes via attribute((target(...)))
3704 which saves space on program startup if the program does not use non-generic
3708 cxx_builtin_function_ext_scope (tree decl)
3711 tree id = DECL_NAME (decl);
3712 const char *name = IDENTIFIER_POINTER (id);
3713 /* All builtins that don't begin with an '_' should additionally
3714 go in the 'std' namespace. */
3717 tree decl2 = copy_node(decl);
3718 push_namespace (std_identifier);
3719 builtin_function_1 (decl2, std_node, true);
3723 return builtin_function_1 (decl, NULL_TREE, true);
3726 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3727 function. Not called directly. */
3730 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3732 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3733 DECL_EXTERNAL (fn) = 1;
3734 TREE_PUBLIC (fn) = 1;
3735 DECL_ARTIFICIAL (fn) = 1;
3736 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3737 SET_DECL_LANGUAGE (fn, lang_c);
3738 /* Runtime library routines are, by definition, available in an
3739 external shared object. */
3740 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3741 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3745 /* Returns the _DECL for a library function with C linkage.
3746 We assume that such functions never throw; if this is incorrect,
3747 callers should unset TREE_NOTHROW. */
3750 build_library_fn (tree name, tree type)
3752 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3753 TREE_NOTHROW (fn) = 1;
3757 /* Returns the _DECL for a library function with C++ linkage. */
3760 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3762 tree fn = build_library_fn_1 (name, operator_code, type);
3763 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3764 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3765 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3769 /* Like build_library_fn, but takes a C string instead of an
3773 build_library_fn_ptr (const char* name, tree type)
3775 return build_library_fn (get_identifier (name), type);
3778 /* Like build_cp_library_fn, but takes a C string instead of an
3782 build_cp_library_fn_ptr (const char* name, tree type)
3784 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3787 /* Like build_library_fn, but also pushes the function so that we will
3788 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3789 may throw exceptions listed in RAISES. */
3792 push_library_fn (tree name, tree type, tree raises)
3797 type = build_exception_variant (type, raises);
3799 fn = build_library_fn (name, type);
3800 pushdecl_top_level (fn);
3804 /* Like build_cp_library_fn, but also pushes the function so that it
3805 will be found by normal lookup. */
3808 push_cp_library_fn (enum tree_code operator_code, tree type)
3810 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3817 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3821 push_void_library_fn (tree name, tree parmtypes)
3823 tree type = build_function_type (void_type_node, parmtypes);
3824 return push_library_fn (name, type, NULL_TREE);
3827 /* Like push_library_fn, but also note that this function throws
3828 and does not return. Used for __throw_foo and the like. */
3831 push_throw_library_fn (tree name, tree type)
3833 tree fn = push_library_fn (name, type, NULL_TREE);
3834 TREE_THIS_VOLATILE (fn) = 1;
3835 TREE_NOTHROW (fn) = 0;
3839 /* When we call finish_struct for an anonymous union, we create
3840 default copy constructors and such. But, an anonymous union
3841 shouldn't have such things; this function undoes the damage to the
3842 anonymous union type T.
3844 (The reason that we create the synthesized methods is that we don't
3845 distinguish `union { int i; }' from `typedef union { int i; } U'.
3846 The first is an anonymous union; the second is just an ordinary
3850 fixup_anonymous_aggr (tree t)
3854 /* Wipe out memory of synthesized methods. */
3855 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3856 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3857 TYPE_HAS_INIT_REF (t) = 0;
3858 TYPE_HAS_CONST_INIT_REF (t) = 0;
3859 TYPE_HAS_ASSIGN_REF (t) = 0;
3860 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3862 /* Splice the implicitly generated functions out of the TYPE_METHODS
3864 q = &TYPE_METHODS (t);
3867 if (DECL_ARTIFICIAL (*q))
3868 *q = TREE_CHAIN (*q);
3870 q = &TREE_CHAIN (*q);
3873 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3874 if (TYPE_METHODS (t))
3876 tree decl = TYPE_MAIN_DECL (t);
3878 if (TREE_CODE (t) != UNION_TYPE)
3879 error_at (DECL_SOURCE_LOCATION (decl),
3880 "an anonymous struct cannot have function members");
3882 error_at (DECL_SOURCE_LOCATION (decl),
3883 "an anonymous union cannot have function members");
3886 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3887 assignment operators (because they cannot have these methods themselves).
3888 For anonymous unions this is already checked because they are not allowed
3889 in any union, otherwise we have to check it. */
3890 if (TREE_CODE (t) != UNION_TYPE)
3894 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3895 if (TREE_CODE (field) == FIELD_DECL)
3897 type = TREE_TYPE (field);
3898 if (CLASS_TYPE_P (type))
3900 if (TYPE_NEEDS_CONSTRUCTING (type))
3901 error ("member %q+#D with constructor not allowed "
3902 "in anonymous aggregate", field);
3903 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3904 error ("member %q+#D with destructor not allowed "
3905 "in anonymous aggregate", field);
3906 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3907 error ("member %q+#D with copy assignment operator "
3908 "not allowed in anonymous aggregate", field);
3914 /* Make sure that a declaration with no declarator is well-formed, i.e.
3915 just declares a tagged type or anonymous union.
3917 Returns the type declared; or NULL_TREE if none. */
3920 check_tag_decl (cp_decl_specifier_seq *declspecs)
3922 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3923 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3924 /* If a class, struct, or enum type is declared by the DECLSPECS
3925 (i.e, if a class-specifier, enum-specifier, or non-typename
3926 elaborated-type-specifier appears in the DECLSPECS),
3927 DECLARED_TYPE is set to the corresponding type. */
3928 tree declared_type = NULL_TREE;
3929 bool error_p = false;
3931 if (declspecs->multiple_types_p)
3932 error ("multiple types in one declaration");
3933 else if (declspecs->redefined_builtin_type)
3935 if (!in_system_header)
3936 permerror (input_location, "redeclaration of C++ built-in type %qT",
3937 declspecs->redefined_builtin_type);
3942 && TYPE_P (declspecs->type)
3943 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3944 && MAYBE_CLASS_TYPE_P (declspecs->type))
3945 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3946 declared_type = declspecs->type;
3947 else if (declspecs->type == error_mark_node)
3949 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3950 permerror (input_location, "declaration does not declare anything");
3951 /* Check for an anonymous union. */
3952 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3953 && TYPE_ANONYMOUS_P (declared_type))
3955 /* 7/3 In a simple-declaration, the optional init-declarator-list
3956 can be omitted only when declaring a class (clause 9) or
3957 enumeration (7.2), that is, when the decl-specifier-seq contains
3958 either a class-specifier, an elaborated-type-specifier with
3959 a class-key (9.1), or an enum-specifier. In these cases and
3960 whenever a class-specifier or enum-specifier is present in the
3961 decl-specifier-seq, the identifiers in these specifiers are among
3962 the names being declared by the declaration (as class-name,
3963 enum-names, or enumerators, depending on the syntax). In such
3964 cases, and except for the declaration of an unnamed bit-field (9.6),
3965 the decl-specifier-seq shall introduce one or more names into the
3966 program, or shall redeclare a name introduced by a previous
3967 declaration. [Example:
3968 enum { }; // ill-formed
3969 typedef class { }; // ill-formed
3973 error ("missing type-name in typedef-declaration");
3976 /* Anonymous unions are objects, so they can have specifiers. */;
3977 SET_ANON_AGGR_TYPE_P (declared_type);
3979 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3980 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3985 if (declspecs->specs[(int)ds_inline]
3986 || declspecs->specs[(int)ds_virtual])
3987 error ("%qs can only be specified for functions",
3988 declspecs->specs[(int)ds_inline]
3989 ? "inline" : "virtual");
3991 && (!current_class_type
3992 || current_scope () != current_class_type))
3993 error ("%<friend%> can only be specified inside a class");
3994 else if (declspecs->specs[(int)ds_explicit])
3995 error ("%<explicit%> can only be specified for constructors");
3996 else if (declspecs->storage_class)
3997 error ("a storage class can only be specified for objects "
3999 else if (declspecs->specs[(int)ds_const]
4000 || declspecs->specs[(int)ds_volatile]
4001 || declspecs->specs[(int)ds_restrict]
4002 || declspecs->specs[(int)ds_thread])
4003 error ("qualifiers can only be specified for objects "
4005 else if (saw_typedef)
4006 warning (0, "%<typedef%> was ignored in this declaration");
4007 else if (declspecs->specs[(int) ds_constexpr])
4008 error ("%<constexpr> cannot be used for type declarations");
4011 return declared_type;
4014 /* Called when a declaration is seen that contains no names to declare.
4015 If its type is a reference to a structure, union or enum inherited
4016 from a containing scope, shadow that tag name for the current scope
4017 with a forward reference.
4018 If its type defines a new named structure or union
4019 or defines an enum, it is valid but we need not do anything here.
4020 Otherwise, it is an error.
4022 C++: may have to grok the declspecs to learn about static,
4023 complain for anonymous unions.
4025 Returns the TYPE declared -- or NULL_TREE if none. */
4028 shadow_tag (cp_decl_specifier_seq *declspecs)
4030 tree t = check_tag_decl (declspecs);
4035 if (declspecs->attributes)
4037 warning (0, "attribute ignored in declaration of %q+#T", t);
4038 warning (0, "attribute for %q+#T must follow the %qs keyword",
4039 t, class_key_or_enum_as_string (t));
4043 if (maybe_process_partial_specialization (t) == error_mark_node)
4046 /* This is where the variables in an anonymous union are
4047 declared. An anonymous union declaration looks like:
4049 because there is no declarator after the union, the parser
4050 sends that declaration here. */
4051 if (ANON_AGGR_TYPE_P (t))
4053 fixup_anonymous_aggr (t);
4055 if (TYPE_FIELDS (t))
4057 tree decl = grokdeclarator (/*declarator=*/NULL,
4058 declspecs, NORMAL, 0, NULL);
4059 finish_anon_union (decl);
4066 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4069 groktypename (cp_decl_specifier_seq *type_specifiers,
4070 const cp_declarator *declarator,
4071 bool is_template_arg)
4075 enum decl_context context
4076 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4077 attrs = type_specifiers->attributes;
4078 type_specifiers->attributes = NULL_TREE;
4079 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4080 if (attrs && type != error_mark_node)
4082 if (CLASS_TYPE_P (type))
4083 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4084 "outside of definition", type);
4085 else if (MAYBE_CLASS_TYPE_P (type))
4086 /* A template type parameter or other dependent type. */
4087 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4088 "type %qT without an associated declaration", type);
4090 cplus_decl_attributes (&type, attrs, 0);
4095 /* Process a DECLARATOR for a function-scope variable declaration,
4096 namespace-scope variable declaration, or function declaration.
4097 (Function definitions go through start_function; class member
4098 declarations appearing in the body of the class go through
4099 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4100 If an error occurs, the error_mark_node is returned instead.
4102 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4103 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4104 for an explicitly defaulted function, or SD_DELETED for an explicitly
4105 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4106 implicitly initialized via a default constructor. ATTRIBUTES and
4107 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4108 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4109 set, the caller is responsible for calling pop_scope. */
4112 start_decl (const cp_declarator *declarator,
4113 cp_decl_specifier_seq *declspecs,
4116 tree prefix_attributes,
4117 tree *pushed_scope_p)
4124 *pushed_scope_p = NULL_TREE;
4126 /* An object declared as __attribute__((deprecated)) suppresses
4127 warnings of uses of other deprecated items. */
4128 if (lookup_attribute ("deprecated", attributes))
4129 deprecated_state = DEPRECATED_SUPPRESS;
4131 attributes = chainon (attributes, prefix_attributes);
4133 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4136 deprecated_state = DEPRECATED_NORMAL;
4138 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4139 || decl == error_mark_node)
4140 return error_mark_node;
4142 context = DECL_CONTEXT (decl);
4146 *pushed_scope_p = push_scope (context);
4148 /* We are only interested in class contexts, later. */
4149 if (TREE_CODE (context) == NAMESPACE_DECL)
4150 context = NULL_TREE;
4154 /* Is it valid for this decl to have an initializer at all?
4155 If not, set INITIALIZED to zero, which will indirectly
4156 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4157 switch (TREE_CODE (decl))
4160 error ("typedef %qD is initialized (use decltype instead)", decl);
4161 return error_mark_node;
4164 if (initialized == SD_DELETED)
4165 /* We'll handle the rest of the semantics later, but we need to
4166 set this now so it's visible to duplicate_decls. */
4167 DECL_DELETED_FN (decl) = 1;
4176 if (! toplevel_bindings_p ()
4177 && DECL_EXTERNAL (decl))
4178 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4180 DECL_EXTERNAL (decl) = 0;
4181 if (toplevel_bindings_p ())
4182 TREE_STATIC (decl) = 1;
4185 /* If this is a typedef that names the class for linkage purposes
4186 (7.1.3p8), apply any attributes directly to the type. */
4187 if (TREE_CODE (decl) == TYPE_DECL
4188 && TAGGED_TYPE_P (TREE_TYPE (decl))
4189 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4190 flags = ATTR_FLAG_TYPE_IN_PLACE;
4194 /* Set attributes here so if duplicate decl, will have proper attributes. */
4195 cplus_decl_attributes (&decl, attributes, flags);
4197 /* Dllimported symbols cannot be defined. Static data members (which
4198 can be initialized in-class and dllimported) go through grokfield,
4199 not here, so we don't need to exclude those decls when checking for
4201 if (initialized && DECL_DLLIMPORT_P (decl))
4203 error ("definition of %q#D is marked %<dllimport%>", decl);
4204 DECL_DLLIMPORT_P (decl) = 0;
4207 /* If #pragma weak was used, mark the decl weak now. */
4208 maybe_apply_pragma_weak (decl);
4210 if (TREE_CODE (decl) == FUNCTION_DECL
4211 && DECL_DECLARED_INLINE_P (decl)
4212 && DECL_UNINLINABLE (decl)
4213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4214 warning (0, "inline function %q+D given attribute noinline", decl);
4216 if (context && COMPLETE_TYPE_P (complete_type (context)))
4218 if (TREE_CODE (decl) == VAR_DECL)
4220 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4221 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4222 error ("%q#D is not a static member of %q#T", decl, context);
4225 if (DECL_CONTEXT (field) != context)
4227 if (!same_type_p (DECL_CONTEXT (field), context))
4228 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4229 "to be defined as %<%T::%D%>",
4230 DECL_CONTEXT (field), DECL_NAME (decl),
4231 context, DECL_NAME (decl));
4232 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4234 if (processing_specialization
4235 && template_class_depth (context) == 0
4236 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4237 error ("template header not allowed in member definition "
4238 "of explicitly specialized class");
4239 /* Static data member are tricky; an in-class initialization
4240 still doesn't provide a definition, so the in-class
4241 declaration will have DECL_EXTERNAL set, but will have an
4242 initialization. Thus, duplicate_decls won't warn
4243 about this situation, and so we check here. */
4244 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4245 error ("duplicate initialization of %qD", decl);
4246 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4248 if (declspecs->specs[(int) ds_constexpr]
4249 && !DECL_DECLARED_CONSTEXPR_P (field))
4250 error ("%qD declared %<constexpr%> outside its class", field);
4255 tree field = check_classfn (context, decl,
4256 (processing_template_decl
4257 > template_class_depth (context))
4258 ? current_template_parms
4260 if (field && field != error_mark_node
4261 && duplicate_decls (decl, field,
4262 /*newdecl_is_friend=*/false))
4266 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4267 DECL_IN_AGGR_P (decl) = 0;
4268 /* Do not mark DECL as an explicit specialization if it was not
4269 already marked as an instantiation; a declaration should
4270 never be marked as a specialization unless we know what
4271 template is being specialized. */
4272 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4274 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4276 /* [temp.expl.spec] An explicit specialization of a static data
4277 member of a template is a definition if the declaration
4278 includes an initializer; otherwise, it is a declaration.
4280 We check for processing_specialization so this only applies
4281 to the new specialization syntax. */
4282 if (!initialized && processing_specialization)
4283 DECL_EXTERNAL (decl) = 1;
4286 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4287 permerror (input_location, "declaration of %q#D outside of class is not definition",
4290 if (!ensure_literal_type_for_constexpr_object (decl))
4291 return error_mark_node;
4294 was_public = TREE_PUBLIC (decl);
4296 /* Enter this declaration into the symbol table. */
4297 decl = maybe_push_decl (decl);
4299 if (processing_template_decl)
4300 decl = push_template_decl (decl);
4301 if (decl == error_mark_node)
4302 return error_mark_node;
4304 /* Tell the back end to use or not use .common as appropriate. If we say
4305 -fconserve-space, we want this to save .data space, at the expense of
4306 wrong semantics. If we say -fno-conserve-space, we want this to
4307 produce errors about redefs; to do this we force variables into the
4309 if (flag_conserve_space
4310 && TREE_CODE (decl) == VAR_DECL
4311 && TREE_PUBLIC (decl)
4312 && !DECL_THREAD_LOCAL_P (decl)
4313 && !have_global_bss_p ())
4314 DECL_COMMON (decl) = 1;
4316 if (TREE_CODE (decl) == VAR_DECL
4317 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4318 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4320 /* This is a const variable with implicit 'static'. Set
4321 DECL_THIS_STATIC so we can tell it from variables that are
4322 !TREE_PUBLIC because of the anonymous namespace. */
4323 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4324 DECL_THIS_STATIC (decl) = 1;
4327 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4328 start_decl_1 (decl, initialized);
4333 /* Process the declaration of a variable DECL. INITIALIZED is true
4334 iff DECL is explicitly initialized. (INITIALIZED is false if the
4335 variable is initialized via an implicitly-called constructor.)
4336 This function must be called for ordinary variables (including, for
4337 example, implicit instantiations of templates), but must not be
4338 called for template declarations. */
4341 start_decl_1 (tree decl, bool initialized)
4345 bool aggregate_definition_p;
4347 gcc_assert (!processing_template_decl);
4349 if (error_operand_p (decl))
4352 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4354 type = TREE_TYPE (decl);
4355 complete_p = COMPLETE_TYPE_P (type);
4356 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4358 /* If an explicit initializer is present, or if this is a definition
4359 of an aggregate, then we need a complete type at this point.
4360 (Scalars are always complete types, so there is nothing to
4361 check.) This code just sets COMPLETE_P; errors (if necessary)
4362 are issued below. */
4363 if ((initialized || aggregate_definition_p)
4365 && COMPLETE_TYPE_P (complete_type (type)))
4368 /* We will not yet have set TREE_READONLY on DECL if the type
4369 was "const", but incomplete, before this point. But, now, we
4370 have a complete type, so we can try again. */
4371 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4375 /* Is it valid for this decl to have an initializer at all? */
4377 /* Don't allow initializations for incomplete types except for
4378 arrays which might be completed by the initialization. */
4380 ; /* A complete type is ok. */
4381 else if (type_uses_auto (type))
4382 ; /* An auto type is ok. */
4383 else if (TREE_CODE (type) != ARRAY_TYPE)
4385 error ("variable %q#D has initializer but incomplete type", decl);
4386 type = TREE_TYPE (decl) = error_mark_node;
4388 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4390 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4391 error ("elements of array %q#D have incomplete type", decl);
4392 /* else we already gave an error in start_decl. */
4395 else if (aggregate_definition_p && !complete_p)
4397 if (type_uses_auto (type))
4398 error ("declaration of %q#D has no initializer", decl);
4400 error ("aggregate %q#D has incomplete type and cannot be defined",
4402 /* Change the type so that assemble_variable will give
4403 DECL an rtl we can live with: (mem (const_int 0)). */
4404 type = TREE_TYPE (decl) = error_mark_node;
4407 /* Create a new scope to hold this declaration if necessary.
4408 Whether or not a new scope is necessary cannot be determined
4409 until after the type has been completed; if the type is a
4410 specialization of a class template it is not until after
4411 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4412 will be set correctly. */
4413 maybe_push_cleanup_level (type);
4416 /* Handle initialization of references. DECL, TYPE, and INIT have the
4417 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4418 but will be set to a new CLEANUP_STMT if a temporary is created
4419 that must be destroyed subsequently.
4421 Returns an initializer expression to use to initialize DECL, or
4422 NULL if the initialization can be performed statically.
4424 Quotes on semantics can be found in ARM 8.4.3. */
4427 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4431 if (init == NULL_TREE)
4433 if ((DECL_LANG_SPECIFIC (decl) == 0
4434 || DECL_IN_AGGR_P (decl) == 0)
4435 && ! DECL_THIS_EXTERN (decl))
4436 error ("%qD declared as reference but not initialized", decl);
4440 if (TREE_CODE (init) == TREE_LIST)
4441 init = build_x_compound_expr_from_list (init, "initializer");
4443 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4444 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4445 /* Note: default conversion is only called in very special cases. */
4446 init = decay_conversion (init);
4448 /* Convert INIT to the reference type TYPE. This may involve the
4449 creation of a temporary, whose lifetime must be the same as that
4450 of the reference. If so, a DECL_EXPR for the temporary will be
4451 added just after the DECL_EXPR for DECL. That's why we don't set
4452 DECL_INITIAL for local references (instead assigning to them
4453 explicitly); we need to allow the temporary to be initialized
4455 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4457 if (tmp == error_mark_node)
4459 else if (tmp == NULL_TREE)
4461 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4465 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4468 DECL_INITIAL (decl) = tmp;
4473 /* Subroutine of check_initializer. We're initializing a DECL of
4474 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4475 extend the lifetime of the underlying array to match that of the decl,
4476 just like for reference initialization. CLEANUP is as for
4477 grok_reference_init. */
4480 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4482 tree aggr_init, array, arrtype;
4483 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4484 if (error_operand_p (init))
4485 return error_mark_node;
4487 aggr_init = TARGET_EXPR_INITIAL (init);
4488 init = build2 (INIT_EXPR, type, decl, init);
4490 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4491 arrtype = TREE_TYPE (array);
4493 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4494 array = TREE_OPERAND (array, 0);
4495 /* If the array is constant, finish_compound_literal already made it a
4496 static variable and we don't need to do anything here. */
4497 if (decl && TREE_CODE (array) == TARGET_EXPR)
4500 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4501 var = build_address (var);
4502 var = convert (arrtype, var);
4503 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4504 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4509 /* Designated initializers in arrays are not supported in GNU C++.
4510 The parser cannot detect this error since it does not know whether
4511 a given brace-enclosed initializer is for a class type or for an
4512 array. This function checks that CE does not use a designated
4513 initializer. If it does, an error is issued. Returns true if CE
4514 is valid, i.e., does not have a designated initializer. */
4517 check_array_designated_initializer (const constructor_elt *ce)
4519 /* Designated initializers for array elements are not supported. */
4522 /* The parser only allows identifiers as designated
4524 if (ce->index == error_mark_node)
4525 error ("name used in a GNU-style designated "
4526 "initializer for an array");
4529 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4530 error ("name %qD used in a GNU-style designated "
4531 "initializer for an array", ce->index);
4539 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4540 array until we finish parsing the initializer. If that's the
4541 situation we're in, update DECL accordingly. */
4544 maybe_deduce_size_from_array_init (tree decl, tree init)
4546 tree type = TREE_TYPE (decl);
4548 if (TREE_CODE (type) == ARRAY_TYPE
4549 && TYPE_DOMAIN (type) == NULL_TREE
4550 && TREE_CODE (decl) != TYPE_DECL)
4552 /* do_default is really a C-ism to deal with tentative definitions.
4553 But let's leave it here to ease the eventual merge. */
4554 int do_default = !DECL_EXTERNAL (decl);
4555 tree initializer = init ? init : DECL_INITIAL (decl);
4558 /* Check that there are no designated initializers in INIT, as
4559 those are not supported in GNU C++, and as the middle-end
4560 will crash if presented with a non-numeric designated
4562 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4564 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4565 constructor_elt *ce;
4568 VEC_iterate (constructor_elt, v, i, ce);
4570 if (!check_array_designated_initializer (ce))
4576 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4580 error ("initializer fails to determine size of %qD", decl);
4581 TREE_TYPE (decl) = error_mark_node;
4583 else if (failure == 2)
4587 error ("array size missing in %qD", decl);
4588 TREE_TYPE (decl) = error_mark_node;
4590 /* If a `static' var's size isn't known, make it extern as
4591 well as static, so it does not get allocated. If it's not
4592 `static', then don't mark it extern; finish_incomplete_decl
4593 will give it a default size and it will get allocated. */
4594 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4595 DECL_EXTERNAL (decl) = 1;
4597 else if (failure == 3)
4599 error ("zero-size array %qD", decl);
4600 TREE_TYPE (decl) = error_mark_node;
4604 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4606 relayout_decl (decl);
4610 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4611 any appropriate error messages regarding the layout. */
4614 layout_var_decl (tree decl)
4618 type = TREE_TYPE (decl);
4619 if (type == error_mark_node)
4622 /* If we haven't already layed out this declaration, do so now.
4623 Note that we must not call complete type for an external object
4624 because it's type might involve templates that we are not
4625 supposed to instantiate yet. (And it's perfectly valid to say
4626 `extern X x' for some incomplete type `X'.) */
4627 if (!DECL_EXTERNAL (decl))
4628 complete_type (type);
4629 if (!DECL_SIZE (decl)
4630 && TREE_TYPE (decl) != error_mark_node
4631 && (COMPLETE_TYPE_P (type)
4632 || (TREE_CODE (type) == ARRAY_TYPE
4633 && !TYPE_DOMAIN (type)
4634 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4635 layout_decl (decl, 0);
4637 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4639 /* An automatic variable with an incomplete type: that is an error.
4640 Don't talk about array types here, since we took care of that
4641 message in grokdeclarator. */
4642 error ("storage size of %qD isn't known", decl);
4643 TREE_TYPE (decl) = error_mark_node;
4646 /* Keep this code around in case we later want to control debug info
4647 based on whether a type is "used". (jason 1999-11-11) */
4649 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4650 /* Let debugger know it should output info for this type. */
4651 note_debug_info_needed (ttype);
4653 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4654 note_debug_info_needed (DECL_CONTEXT (decl));
4657 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4658 && DECL_SIZE (decl) != NULL_TREE
4659 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4661 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4662 constant_expression_warning (DECL_SIZE (decl));
4665 error ("storage size of %qD isn't constant", decl);
4666 TREE_TYPE (decl) = error_mark_node;
4671 /* If a local static variable is declared in an inline function, or if
4672 we have a weak definition, we must endeavor to create only one
4673 instance of the variable at link-time. */
4676 maybe_commonize_var (tree decl)
4678 /* Static data in a function with comdat linkage also has comdat
4680 if (TREE_STATIC (decl)
4681 /* Don't mess with __FUNCTION__. */
4682 && ! DECL_ARTIFICIAL (decl)
4683 && DECL_FUNCTION_SCOPE_P (decl)
4684 && vague_linkage_p (DECL_CONTEXT (decl)))
4688 /* With weak symbols, we simply make the variable COMDAT;
4689 that will cause copies in multiple translations units to
4691 comdat_linkage (decl);
4695 if (DECL_INITIAL (decl) == NULL_TREE
4696 || DECL_INITIAL (decl) == error_mark_node)
4698 /* Without weak symbols, we can use COMMON to merge
4699 uninitialized variables. */
4700 TREE_PUBLIC (decl) = 1;
4701 DECL_COMMON (decl) = 1;
4705 /* While for initialized variables, we must use internal
4706 linkage -- which means that multiple copies will not
4708 TREE_PUBLIC (decl) = 0;
4709 DECL_COMMON (decl) = 0;
4710 warning_at (input_location, 0,
4711 "sorry: semantics of inline function static "
4712 "data %q+#D are wrong (you'll wind up "
4713 "with multiple copies)", decl);
4714 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4715 " you can work around this by removing "
4720 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4721 /* Set it up again; we might have set DECL_INITIAL since the last
4723 comdat_linkage (decl);
4726 /* Issue an error message if DECL is an uninitialized const variable. */
4729 check_for_uninitialized_const_var (tree decl)
4731 tree type = strip_array_types (TREE_TYPE (decl));
4733 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4734 && DECL_INITIAL (decl) == NULL)
4735 error ("missing initializer for constexpr %qD", decl);
4737 /* ``Unless explicitly declared extern, a const object does not have
4738 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4740 else if (TREE_CODE (decl) == VAR_DECL
4741 && TREE_CODE (type) != REFERENCE_TYPE
4742 && CP_TYPE_CONST_P (type)
4743 && (!TYPE_NEEDS_CONSTRUCTING (type)
4744 || !type_has_user_provided_default_constructor (type))
4745 && !DECL_INITIAL (decl))
4747 permerror (DECL_SOURCE_LOCATION (decl),
4748 "uninitialized const %qD", decl);
4750 if (CLASS_TYPE_P (type)
4751 && !type_has_user_provided_default_constructor (type))
4753 tree defaulted_ctor;
4755 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4756 "%q#T has no user-provided default constructor", type);
4757 defaulted_ctor = in_class_defaulted_default_constructor (type);
4759 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4760 "constructor is not user-provided because it is "
4761 "explicitly defaulted in the class body");
4766 /* Structure holding the current initializer being processed by reshape_init.
4767 CUR is a pointer to the current element being processed, END is a pointer
4768 after the last element present in the initializer. */
4769 typedef struct reshape_iterator_t
4771 constructor_elt *cur;
4772 constructor_elt *end;
4775 static tree reshape_init_r (tree, reshape_iter *, bool);
4777 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4778 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4779 initialized. If there are no more such fields, the return value
4783 next_initializable_field (tree field)
4786 && (TREE_CODE (field) != FIELD_DECL
4787 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4788 || DECL_ARTIFICIAL (field)))
4789 field = TREE_CHAIN (field);
4794 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4795 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4796 INTEGER_CST representing the size of the array minus one (the maximum index),
4797 or NULL_TREE if the array was declared without specifying the size. D is
4798 the iterator within the constructor. */
4801 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4804 bool sized_array_p = (max_index != NULL_TREE);
4805 unsigned HOST_WIDE_INT max_index_cst = 0;
4806 unsigned HOST_WIDE_INT index;
4808 /* The initializer for an array is always a CONSTRUCTOR. */
4809 new_init = build_constructor (init_list_type_node, NULL);
4813 /* Minus 1 is used for zero sized arrays. */
4814 if (integer_all_onesp (max_index))
4817 if (host_integerp (max_index, 1))
4818 max_index_cst = tree_low_cst (max_index, 1);
4819 /* sizetype is sign extended, not zero extended. */
4821 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4825 /* Loop until there are no more initializers. */
4827 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4832 check_array_designated_initializer (d->cur);
4833 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4834 if (elt_init == error_mark_node)
4835 return error_mark_node;
4836 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4842 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4843 Parameters are the same of reshape_init_r. */
4846 reshape_init_array (tree type, reshape_iter *d)
4848 tree max_index = NULL_TREE;
4850 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4852 if (TYPE_DOMAIN (type))
4853 max_index = array_type_nelts (type);
4855 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4858 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4859 Parameters are the same of reshape_init_r. */
4862 reshape_init_vector (tree type, reshape_iter *d)
4864 tree max_index = NULL_TREE;
4867 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4869 if (COMPOUND_LITERAL_P (d->cur->value))
4871 tree value = d->cur->value;
4872 if (!same_type_p (TREE_TYPE (value), type))
4874 error ("invalid type %qT as initializer for a vector of type %qT",
4875 TREE_TYPE (d->cur->value), type);
4876 value = error_mark_node;
4882 /* For a vector, the representation type is a struct
4883 containing a single member which is an array of the
4884 appropriate size. */
4885 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4886 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4887 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4889 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4892 /* Subroutine of reshape_init_r, processes the initializers for classes
4893 or union. Parameters are the same of reshape_init_r. */
4896 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4901 gcc_assert (CLASS_TYPE_P (type));
4903 /* The initializer for a class is always a CONSTRUCTOR. */
4904 new_init = build_constructor (init_list_type_node, NULL);
4905 field = next_initializable_field (TYPE_FIELDS (type));
4911 An initializer for an aggregate member that is an
4912 empty class shall have the form of an empty
4913 initializer-list {}. */
4914 if (!first_initializer_p)
4916 error ("initializer for %qT must be brace-enclosed", type);
4917 return error_mark_node;
4922 /* Loop through the initializable fields, gathering initializers. */
4923 while (d->cur != d->end)
4927 /* Handle designated initializers, as an extension. */
4930 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4932 if (!field || TREE_CODE (field) != FIELD_DECL)
4934 error ("%qT has no non-static data member named %qD", type,
4936 return error_mark_node;
4940 /* If we processed all the member of the class, we are done. */
4944 field_init = reshape_init_r (TREE_TYPE (field), d,
4945 /*first_initializer_p=*/false);
4946 if (field_init == error_mark_node)
4947 return error_mark_node;
4949 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4953 When a union is initialized with a brace-enclosed
4954 initializer, the braces shall only contain an
4955 initializer for the first member of the union. */
4956 if (TREE_CODE (type) == UNION_TYPE)
4959 field = next_initializable_field (TREE_CHAIN (field));
4965 /* Subroutine of reshape_init, which processes a single initializer (part of
4966 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4967 iterator within the CONSTRUCTOR which points to the initializer to process.
4968 FIRST_INITIALIZER_P is true if this is the first initializer of the
4969 outermost CONSTRUCTOR node. */
4972 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4974 tree init = d->cur->value;
4976 if (error_operand_p (init))
4977 return error_mark_node;
4979 /* A non-aggregate type is always initialized with a single
4981 if (!CP_AGGREGATE_TYPE_P (type))
4983 /* It is invalid to initialize a non-aggregate type with a
4984 brace-enclosed initializer before C++0x.
4985 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4986 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4987 a CONSTRUCTOR (with a record type). */
4988 if (TREE_CODE (init) == CONSTRUCTOR
4989 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4991 if (SCALAR_TYPE_P (type))
4993 error ("braces around scalar initializer for type %qT", type);
4994 init = error_mark_node;
4997 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5006 All implicit type conversions (clause _conv_) are considered when
5007 initializing the aggregate member with an initializer from an
5008 initializer-list. If the initializer can initialize a member,
5009 the member is initialized. Otherwise, if the member is itself a
5010 non-empty subaggregate, brace elision is assumed and the
5011 initializer is considered for the initialization of the first
5012 member of the subaggregate. */
5013 if (TREE_CODE (init) != CONSTRUCTOR
5014 /* But don't try this for the first initializer, since that would be
5015 looking through the outermost braces; A a2 = { a1 }; is not a
5016 valid aggregate initialization. */
5017 && !first_initializer_p
5018 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5019 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5025 /* [dcl.init.string]
5027 A char array (whether plain char, signed char, or unsigned char)
5028 can be initialized by a string-literal (optionally enclosed in
5029 braces); a wchar_t array can be initialized by a wide
5030 string-literal (optionally enclosed in braces). */
5031 if (TREE_CODE (type) == ARRAY_TYPE
5032 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5034 tree str_init = init;
5036 /* Strip one level of braces if and only if they enclose a single
5037 element (as allowed by [dcl.init.string]). */
5038 if (!first_initializer_p
5039 && TREE_CODE (str_init) == CONSTRUCTOR
5040 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5042 str_init = VEC_index (constructor_elt,
5043 CONSTRUCTOR_ELTS (str_init), 0)->value;
5046 /* If it's a string literal, then it's the initializer for the array
5047 as a whole. Otherwise, continue with normal initialization for
5048 array types (one value per array element). */
5049 if (TREE_CODE (str_init) == STRING_CST)
5056 /* The following cases are about aggregates. If we are not within a full
5057 initializer already, and there is not a CONSTRUCTOR, it means that there
5058 is a missing set of braces (that is, we are processing the case for
5059 which reshape_init exists). */
5060 if (!first_initializer_p)
5062 if (TREE_CODE (init) == CONSTRUCTOR)
5064 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5065 /* There is no need to reshape pointer-to-member function
5066 initializers, as they are always constructed correctly
5067 by the front end. */
5069 else if (COMPOUND_LITERAL_P (init))
5070 /* For a nested compound literal, there is no need to reshape since
5071 brace elision is not allowed. Even if we decided to allow it,
5072 we should add a call to reshape_init in finish_compound_literal,
5073 before calling digest_init, so changing this code would still
5074 not be necessary. */
5075 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5079 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5080 return reshape_init (type, init);
5084 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5088 /* Dispatch to specialized routines. */
5089 if (CLASS_TYPE_P (type))
5090 return reshape_init_class (type, d, first_initializer_p);
5091 else if (TREE_CODE (type) == ARRAY_TYPE)
5092 return reshape_init_array (type, d);
5093 else if (TREE_CODE (type) == VECTOR_TYPE)
5094 return reshape_init_vector (type, d);
5099 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5100 brace-enclosed aggregate initializer.
5102 INIT is the CONSTRUCTOR containing the list of initializers describing
5103 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5104 It may not presently match the shape of the TYPE; for example:
5106 struct S { int a; int b; };
5107 struct S a[] = { 1, 2, 3, 4 };
5109 Here INIT will hold a VEC of four elements, rather than a
5110 VEC of two elements, each itself a VEC of two elements. This
5111 routine transforms INIT from the former form into the latter. The
5112 revised CONSTRUCTOR node is returned. */
5115 reshape_init (tree type, tree init)
5117 VEC(constructor_elt, gc) *v;
5121 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5123 v = CONSTRUCTOR_ELTS (init);
5125 /* An empty constructor does not need reshaping, and it is always a valid
5127 if (VEC_empty (constructor_elt, v))
5130 /* Recurse on this CONSTRUCTOR. */
5131 d.cur = VEC_index (constructor_elt, v, 0);
5132 d.end = d.cur + VEC_length (constructor_elt, v);
5134 new_init = reshape_init_r (type, &d, true);
5135 if (new_init == error_mark_node)
5136 return error_mark_node;
5138 /* Make sure all the element of the constructor were used. Otherwise,
5139 issue an error about exceeding initializers. */
5141 error ("too many initializers for %qT", type);
5146 /* Verify array initializer. Returns true if errors have been reported. */
5149 check_array_initializer (tree decl, tree type, tree init)
5151 tree element_type = TREE_TYPE (type);
5153 /* The array type itself need not be complete, because the
5154 initializer may tell us how many elements are in the array.
5155 But, the elements of the array must be complete. */
5156 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5159 error ("elements of array %q#D have incomplete type", decl);
5161 error ("elements of array %q#T have incomplete type", type);
5164 /* It is not valid to initialize a VLA. */
5166 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5167 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5170 error ("variable-sized object %qD may not be initialized", decl);
5172 error ("variable-sized compound literal");
5178 /* Subroutine of check_initializer; args are passed down from that function.
5179 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5182 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5185 int saved_stmts_are_full_exprs_p = 0;
5186 if (building_stmt_tree ())
5188 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5189 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5191 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5192 if (building_stmt_tree ())
5193 current_stmt_tree ()->stmts_are_full_exprs_p =
5194 saved_stmts_are_full_exprs_p;
5198 /* Verify INIT (the initializer for DECL), and record the
5199 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5200 grok_reference_init.
5202 If the return value is non-NULL, it is an expression that must be
5203 evaluated dynamically to initialize DECL. */
5206 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5208 tree type = TREE_TYPE (decl);
5209 tree init_code = NULL;
5212 /* Things that are going to be initialized need to have complete
5214 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5216 if (type == error_mark_node)
5217 /* We will have already complained. */
5220 if (TREE_CODE (type) == ARRAY_TYPE)
5222 if (check_array_initializer (decl, type, init))
5225 else if (!COMPLETE_TYPE_P (type))
5227 error ("%qD has incomplete type", decl);
5228 TREE_TYPE (decl) = error_mark_node;
5232 /* There is no way to make a variable-sized class type in GNU C++. */
5233 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5235 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5237 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5238 if (SCALAR_TYPE_P (type))
5242 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5243 init = build_zero_init (type, NULL_TREE, false);
5245 else if (init_len != 1)
5247 error ("scalar object %qD requires one element in initializer",
5249 TREE_TYPE (decl) = error_mark_node;
5255 if (TREE_CODE (decl) == CONST_DECL)
5257 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5259 DECL_INITIAL (decl) = init;
5261 gcc_assert (init != NULL_TREE);
5264 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5265 init = grok_reference_init (decl, type, init, cleanup);
5268 /* Do not reshape constructors of vectors (they don't need to be
5270 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5272 if (is_std_init_list (type))
5273 return build_init_list_var_init (decl, type, init, cleanup);
5274 else if (TYPE_NON_AGGREGATE_CLASS (type))
5276 /* Don't reshape if the class has constructors. */
5277 if (cxx_dialect == cxx98)
5278 error ("in C++98 %qD must be initialized by constructor, "
5281 init = build_tree_list (NULL_TREE, init);
5283 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5285 error ("opaque vector types cannot be initialized");
5286 init = error_mark_node;
5289 init = reshape_init (type, init);
5292 /* If DECL has an array type without a specific bound, deduce the
5293 array size from the initializer. */
5294 maybe_deduce_size_from_array_init (decl, init);
5295 type = TREE_TYPE (decl);
5296 if (type == error_mark_node)
5299 if (TYPE_NEEDS_CONSTRUCTING (type)
5300 || (CLASS_TYPE_P (type)
5301 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5302 return build_aggr_init_full_exprs (decl, init, flags);
5303 else if (TREE_CODE (init) != TREE_VEC)
5305 init_code = store_init_value (decl, init, flags);
5306 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5307 && DECL_INITIAL (decl)
5308 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5309 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5310 warning (0, "array %qD initialized by parenthesized string literal %qE",
5311 decl, DECL_INITIAL (decl));
5315 else if (DECL_EXTERNAL (decl))
5317 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5319 check_for_uninitialized_const_var (decl);
5320 return build_aggr_init_full_exprs (decl, init, flags);
5322 else if (MAYBE_CLASS_TYPE_P (core_type = strip_array_types (type)))
5324 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5325 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5326 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5329 check_for_uninitialized_const_var (decl);
5332 check_for_uninitialized_const_var (decl);
5334 if (init && init != error_mark_node)
5335 init_code = build2 (INIT_EXPR, type, decl, init);
5340 /* If DECL is not a local variable, give it RTL. */
5343 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5345 int toplev = toplevel_bindings_p ();
5347 const char *filename;
5349 /* Set the DECL_ASSEMBLER_NAME for the object. */
5352 /* The `register' keyword, when used together with an
5353 asm-specification, indicates that the variable should be
5354 placed in a particular register. */
5355 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5357 set_user_assembler_name (decl, asmspec);
5358 DECL_HARD_REGISTER (decl) = 1;
5362 if (TREE_CODE (decl) == FUNCTION_DECL
5363 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5364 set_builtin_user_assembler_name (decl, asmspec);
5365 set_user_assembler_name (decl, asmspec);
5369 /* Handle non-variables up front. */
5370 if (TREE_CODE (decl) != VAR_DECL)
5372 rest_of_decl_compilation (decl, toplev, at_eof);
5376 /* If we see a class member here, it should be a static data
5378 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5380 gcc_assert (TREE_STATIC (decl));
5381 /* An in-class declaration of a static data member should be
5382 external; it is only a declaration, and not a definition. */
5383 if (init == NULL_TREE)
5384 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5387 /* We don't create any RTL for local variables. */
5388 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5391 /* We defer emission of local statics until the corresponding
5392 DECL_EXPR is expanded. */
5393 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5395 /* We try to defer namespace-scope static constants so that they are
5396 not emitted into the object file unnecessarily. */
5397 filename = input_filename;
5398 if (!DECL_VIRTUAL_P (decl)
5399 && TREE_READONLY (decl)
5400 && DECL_INITIAL (decl) != NULL_TREE
5401 && DECL_INITIAL (decl) != error_mark_node
5403 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5405 && !TREE_PUBLIC (decl))
5407 /* Fool with the linkage of static consts according to #pragma
5409 struct c_fileinfo *finfo = get_fileinfo (filename);
5410 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5412 TREE_PUBLIC (decl) = 1;
5413 DECL_EXTERNAL (decl) = finfo->interface_only;
5418 /* Likewise for template instantiations. */
5419 else if (DECL_LANG_SPECIFIC (decl)
5420 && DECL_IMPLICIT_INSTANTIATION (decl))
5423 /* If we're not deferring, go ahead and assemble the variable. */
5425 rest_of_decl_compilation (decl, toplev, at_eof);
5428 /* walk_tree helper for wrap_temporary_cleanups, below. */
5431 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5433 if (TYPE_P (*stmt_p))
5439 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5441 tree guard = (tree)data;
5442 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5444 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5445 /* Tell honor_protect_cleanup_actions to handle this as a separate
5447 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5449 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5455 /* We're initializing a local variable which has a cleanup GUARD. If there
5456 are any temporaries used in the initializer INIT of this variable, we
5457 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5458 variable will be cleaned up properly if one of them throws.
5460 Unfortunately, there's no way to express this properly in terms of
5461 nesting, as the regions for the temporaries overlap the region for the
5462 variable itself; if there are two temporaries, the variable needs to be
5463 the first thing destroyed if either of them throws. However, we only
5464 want to run the variable's cleanup if it actually got constructed. So
5465 we need to guard the temporary cleanups with the variable's cleanup if
5466 they are run on the normal path, but not if they are run on the
5467 exceptional path. We implement this by telling
5468 honor_protect_cleanup_actions to strip the variable cleanup from the
5469 exceptional path. */
5472 wrap_temporary_cleanups (tree init, tree guard)
5474 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5477 /* Generate code to initialize DECL (a local variable). */
5480 initialize_local_var (tree decl, tree init)
5482 tree type = TREE_TYPE (decl);
5486 gcc_assert (TREE_CODE (decl) == VAR_DECL
5487 || TREE_CODE (decl) == RESULT_DECL);
5488 gcc_assert (!TREE_STATIC (decl));
5490 if (DECL_SIZE (decl) == NULL_TREE)
5492 /* If we used it already as memory, it must stay in memory. */
5493 DECL_INITIAL (decl) = NULL_TREE;
5494 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5498 if (type == error_mark_node)
5501 /* Compute and store the initial value. */
5502 already_used = TREE_USED (decl) || TREE_USED (type);
5504 /* Generate a cleanup, if necessary. */
5505 cleanup = cxx_maybe_build_cleanup (decl);
5507 /* Perform the initialization. */
5510 int saved_stmts_are_full_exprs_p;
5512 /* If we're only initializing a single object, guard the destructors
5513 of any temporaries used in its initializer with its destructor.
5514 This isn't right for arrays because each element initialization is
5515 a full-expression. */
5516 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5517 wrap_temporary_cleanups (init, cleanup);
5519 gcc_assert (building_stmt_tree ());
5520 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5521 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5522 finish_expr_stmt (init);
5523 current_stmt_tree ()->stmts_are_full_exprs_p =
5524 saved_stmts_are_full_exprs_p;
5527 /* Set this to 0 so we can tell whether an aggregate which was
5528 initialized was ever used. Don't do this if it has a
5529 destructor, so we don't complain about the 'resource
5530 allocation is initialization' idiom. Now set
5531 attribute((unused)) on types so decls of that type will be
5532 marked used. (see TREE_USED, above.) */
5533 if (TYPE_NEEDS_CONSTRUCTING (type)
5535 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5536 && DECL_NAME (decl))
5537 TREE_USED (decl) = 0;
5538 else if (already_used)
5539 TREE_USED (decl) = 1;
5542 finish_decl_cleanup (decl, cleanup);
5545 /* DECL is a VAR_DECL for a compiler-generated variable with static
5546 storage duration (like a virtual table) whose initializer is a
5547 compile-time constant. INIT must be either a TREE_LIST of values,
5548 or a CONSTRUCTOR. Initialize the variable and provide it to the
5552 initialize_artificial_var (tree decl, tree init)
5554 gcc_assert (DECL_ARTIFICIAL (decl));
5555 if (TREE_CODE (init) == TREE_LIST)
5556 init = build_constructor_from_list (TREE_TYPE (decl), init);
5557 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5558 DECL_INITIAL (decl) = init;
5559 DECL_INITIALIZED_P (decl) = 1;
5560 determine_visibility (decl);
5561 layout_var_decl (decl);
5562 maybe_commonize_var (decl);
5563 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5566 /* INIT is the initializer for a variable, as represented by the
5567 parser. Returns true iff INIT is value-dependent. */
5570 value_dependent_init_p (tree init)
5572 if (TREE_CODE (init) == TREE_LIST)
5573 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5574 return any_value_dependent_elements_p (init);
5575 else if (TREE_CODE (init) == CONSTRUCTOR)
5576 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5578 VEC(constructor_elt, gc) *elts;
5582 elts = CONSTRUCTOR_ELTS (init);
5583 nelts = VEC_length (constructor_elt, elts);
5584 for (i = 0; i < nelts; ++i)
5585 if (value_dependent_init_p (VEC_index (constructor_elt,
5590 /* It must be a simple expression, e.g., int i = 3; */
5591 return value_dependent_expression_p (init);
5596 /* Finish processing of a declaration;
5597 install its line number and initial value.
5598 If the length of an array type is not known before,
5599 it must be determined now, from the initial value, or it is an error.
5601 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5602 true, then INIT is an integral constant expression.
5604 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5605 if the (init) syntax was used. */
5608 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5609 tree asmspec_tree, int flags)
5613 const char *asmspec = NULL;
5614 int was_readonly = 0;
5615 bool var_definition_p = false;
5616 int saved_processing_template_decl;
5619 if (decl == error_mark_node)
5624 error ("assignment (not initialization) in declaration");
5628 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5629 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5630 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5632 type = TREE_TYPE (decl);
5633 if (type == error_mark_node)
5636 /* Assume no cleanup is required. */
5637 cleanup = NULL_TREE;
5638 saved_processing_template_decl = processing_template_decl;
5640 /* If a name was specified, get the string. */
5641 if (global_scope_p (current_binding_level))
5642 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5643 if (asmspec_tree && asmspec_tree != error_mark_node)
5644 asmspec = TREE_STRING_POINTER (asmspec_tree);
5646 if (current_class_type
5647 && CP_DECL_CONTEXT (decl) == current_class_type
5648 && TYPE_BEING_DEFINED (current_class_type)
5649 && (DECL_INITIAL (decl) || init))
5650 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5652 auto_node = type_uses_auto (type);
5655 if (init == NULL_TREE)
5657 error ("declaration of %q#D has no initializer", decl);
5658 TREE_TYPE (decl) = error_mark_node;
5661 if (TREE_CODE (init) == TREE_LIST)
5662 init = build_x_compound_expr_from_list (init, "initializer");
5663 if (describable_type (init))
5665 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5666 if (type == error_mark_node)
5671 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5674 if (init == ridpointers[(int)RID_DELETE])
5676 /* FIXME check this is 1st decl. */
5677 DECL_DELETED_FN (decl) = 1;
5678 DECL_DECLARED_INLINE_P (decl) = 1;
5679 DECL_INITIAL (decl) = error_mark_node;
5680 FOR_EACH_CLONE (clone, decl)
5682 DECL_DELETED_FN (clone) = 1;
5683 DECL_DECLARED_INLINE_P (clone) = 1;
5684 DECL_INITIAL (clone) = error_mark_node;
5688 else if (init == ridpointers[(int)RID_DEFAULT])
5690 if (defaultable_fn_check (decl))
5691 DECL_DEFAULTED_FN (decl) = 1;
5693 DECL_INITIAL (decl) = NULL_TREE;
5697 if (processing_template_decl)
5699 bool type_dependent_p;
5701 /* Add this declaration to the statement-tree. */
5702 if (at_function_scope_p ())
5703 add_decl_expr (decl);
5705 type_dependent_p = dependent_type_p (type);
5707 if (check_for_bare_parameter_packs (init))
5710 DECL_INITIAL (decl) = NULL_TREE;
5713 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5715 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5716 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5717 TREE_CONSTANT (decl) = 1;
5720 /* Generally, initializers in templates are expanded when the
5721 template is instantiated. But, if DECL is an integral
5722 constant static data member, then it can be used in future
5723 integral constant expressions, and its value must be
5726 && DECL_CLASS_SCOPE_P (decl)
5727 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5728 && !type_dependent_p
5729 && !value_dependent_init_p (init)))
5732 DECL_INITIAL (decl) = init;
5733 if (TREE_CODE (decl) == VAR_DECL
5734 && !DECL_PRETTY_FUNCTION_P (decl)
5735 && !type_dependent_p)
5736 maybe_deduce_size_from_array_init (decl, init);
5740 if (TREE_CODE (init) == TREE_LIST)
5742 /* If the parenthesized-initializer form was used (e.g.,
5743 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5744 arguments. (There is generally only one.) We convert them
5747 for (; list; list = TREE_CHAIN (list))
5749 tree elt = TREE_VALUE (list);
5750 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5754 init = fold_non_dependent_expr (init);
5755 processing_template_decl = 0;
5758 /* Take care of TYPE_DECLs up front. */
5759 if (TREE_CODE (decl) == TYPE_DECL)
5761 if (type != error_mark_node
5762 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5764 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5765 warning (0, "shadowing previous type declaration of %q#D", decl);
5766 set_identifier_type_value (DECL_NAME (decl), decl);
5769 /* If we have installed this as the canonical typedef for this
5770 type, and that type has not been defined yet, delay emitting
5771 the debug information for it, as we will emit it later. */
5772 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5773 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5774 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5776 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5781 /* A reference will be modified here, as it is initialized. */
5782 if (! DECL_EXTERNAL (decl)
5783 && TREE_READONLY (decl)
5784 && TREE_CODE (type) == REFERENCE_TYPE)
5787 TREE_READONLY (decl) = 0;
5790 if (TREE_CODE (decl) == VAR_DECL)
5792 /* Only variables with trivial initialization and destruction can
5793 have thread-local storage. */
5794 if (DECL_THREAD_LOCAL_P (decl)
5795 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5796 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5797 error ("%qD cannot be thread-local because it has non-trivial "
5798 "type %qT", decl, TREE_TYPE (decl));
5799 /* If this is a local variable that will need a mangled name,
5800 register it now. We must do this before processing the
5801 initializer for the variable, since the initialization might
5802 require a guard variable, and since the mangled name of the
5803 guard variable will depend on the mangled name of this
5805 if (DECL_FUNCTION_SCOPE_P (decl)
5806 && TREE_STATIC (decl)
5807 && !DECL_ARTIFICIAL (decl))
5809 push_local_name (decl);
5810 if (DECL_CONSTRUCTOR_P (current_function_decl)
5811 || DECL_DESTRUCTOR_P (current_function_decl))
5812 /* Normally local_decls is populated during GIMPLE lowering,
5813 but [cd]tors are never actually compiled directly. We need
5814 to put statics on the list so we can deal with the label
5815 address extension. */
5816 cfun->local_decls = tree_cons (NULL_TREE, decl,
5820 /* Convert the initializer to the type of DECL, if we have not
5821 already initialized DECL. */
5822 if (!DECL_INITIALIZED_P (decl)
5823 /* If !DECL_EXTERNAL then DECL is being defined. In the
5824 case of a static data member initialized inside the
5825 class-specifier, there can be an initializer even if DECL
5826 is *not* defined. */
5827 && (!DECL_EXTERNAL (decl) || init))
5829 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5832 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5833 /* Allow libjava/prims.cc define primitive classes. */
5834 if (init != NULL_TREE
5835 || jclass == NULL_TREE
5836 || TREE_CODE (jclass) != TYPE_DECL
5837 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5838 || !same_type_ignoring_top_level_qualifiers_p
5839 (type, TREE_TYPE (TREE_TYPE (jclass))))
5840 error ("Java object %qD not allocated with %<new%>", decl);
5845 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5846 if (init_const_expr_p)
5848 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5849 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5850 TREE_CONSTANT (decl) = 1;
5853 init = check_initializer (decl, init, flags, &cleanup);
5854 /* Thread-local storage cannot be dynamically initialized. */
5855 if (DECL_THREAD_LOCAL_P (decl) && init)
5857 error ("%qD is thread-local and so cannot be dynamically "
5858 "initialized", decl);
5862 /* Check that the initializer for a static data member was a
5863 constant. Although we check in the parser that the
5864 initializer is an integral constant expression, we do not
5865 simplify division-by-zero at the point at which it
5866 occurs. Therefore, in:
5868 struct S { static const int i = 7 / 0; };
5870 we issue an error at this point. It would
5871 probably be better to forbid division by zero in
5872 integral constant expressions. */
5873 if (DECL_EXTERNAL (decl) && init)
5875 error ("%qD cannot be initialized by a non-constant expression"
5876 " when being declared", decl);
5877 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5885 The memory occupied by any object of static storage
5886 duration is zero-initialized at program startup before
5887 any other initialization takes place.
5889 We cannot create an appropriate initializer until after
5890 the type of DECL is finalized. If DECL_INITIAL is set,
5891 then the DECL is statically initialized, and any
5892 necessary zero-initialization has already been performed. */
5893 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5894 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5895 /*nelts=*/NULL_TREE,
5896 /*static_storage_p=*/true);
5897 /* Remember that the initialization for this variable has
5899 DECL_INITIALIZED_P (decl) = 1;
5900 /* This declaration is the definition of this variable,
5901 unless we are initializing a static data member within
5902 the class specifier. */
5903 if (!DECL_EXTERNAL (decl))
5904 var_definition_p = true;
5906 /* If the variable has an array type, lay out the type, even if
5907 there is no initializer. It is valid to index through the
5908 array, and we must get TYPE_ALIGN set correctly on the array
5910 else if (TREE_CODE (type) == ARRAY_TYPE)
5913 if (!processing_template_decl
5914 && TREE_STATIC (decl)
5915 && !at_function_scope_p ()
5916 && current_function_decl == NULL)
5917 /* So decl is a global variable or a static member of a
5918 non local class. Record the types it uses
5919 so that we can decide later to emit debug info for them. */
5920 record_types_used_by_current_var_decl (decl);
5922 else if (TREE_CODE (decl) == FIELD_DECL
5923 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5924 error ("non-static data member %qD has Java class type", decl);
5926 /* Add this declaration to the statement-tree. This needs to happen
5927 after the call to check_initializer so that the DECL_EXPR for a
5928 reference temp is added before the DECL_EXPR for the reference itself. */
5929 if (at_function_scope_p ())
5930 add_decl_expr (decl);
5932 /* Let the middle end know about variables and functions -- but not
5933 static data members in uninstantiated class templates. */
5934 if (!saved_processing_template_decl
5935 && (TREE_CODE (decl) == VAR_DECL
5936 || TREE_CODE (decl) == FUNCTION_DECL))
5938 if (TREE_CODE (decl) == VAR_DECL)
5940 layout_var_decl (decl);
5941 maybe_commonize_var (decl);
5944 /* This needs to happen after the linkage is set. */
5945 determine_visibility (decl);
5947 if (var_definition_p && TREE_STATIC (decl))
5949 /* If a TREE_READONLY variable needs initialization
5950 at runtime, it is no longer readonly and we need to
5951 avoid MEM_READONLY_P being set on RTL created for it. */
5954 if (TREE_READONLY (decl))
5955 TREE_READONLY (decl) = 0;
5958 else if (was_readonly)
5959 TREE_READONLY (decl) = 1;
5962 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5964 /* Check for abstractness of the type. Notice that there is no
5965 need to strip array types here since the check for those types
5966 is already done within create_array_type_for_decl. */
5967 if (TREE_CODE (type) == FUNCTION_TYPE
5968 || TREE_CODE (type) == METHOD_TYPE)
5969 abstract_virtuals_error (decl, TREE_TYPE (type));
5971 abstract_virtuals_error (decl, type);
5973 if (TREE_TYPE (decl) == error_mark_node)
5974 /* No initialization required. */
5976 else if (TREE_CODE (decl) == FUNCTION_DECL)
5980 if (init == ridpointers[(int)RID_DEFAULT])
5982 /* An out-of-class default definition is defined at
5983 the point where it is explicitly defaulted. */
5984 if (DECL_INITIAL (decl) == error_mark_node)
5985 synthesize_method (decl);
5988 error ("function %q#D is initialized like a variable", decl);
5990 /* else no initialization required. */
5992 else if (DECL_EXTERNAL (decl)
5993 && ! (DECL_LANG_SPECIFIC (decl)
5994 && DECL_NOT_REALLY_EXTERN (decl)))
5997 DECL_INITIAL (decl) = init;
5999 /* A variable definition. */
6000 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6001 /* Initialize the local variable. */
6002 initialize_local_var (decl, init);
6004 /* If a variable is defined, and then a subsequent
6005 definition with external linkage is encountered, we will
6006 get here twice for the same variable. We want to avoid
6007 calling expand_static_init more than once. For variables
6008 that are not static data members, we can call
6009 expand_static_init only when we actually process the
6010 initializer. It is not legal to redeclare a static data
6011 member, so this issue does not arise in that case. */
6012 else if (var_definition_p && TREE_STATIC (decl))
6013 expand_static_init (decl, init);
6016 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6017 reference, insert it in the statement-tree now. */
6019 push_cleanup (decl, cleanup, false);
6022 processing_template_decl = saved_processing_template_decl;
6025 TREE_READONLY (decl) = 1;
6027 /* If this was marked 'used', be sure it will be output. */
6028 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
6029 mark_decl_referenced (decl);
6032 /* Returns a declaration for a VAR_DECL as if:
6034 extern "C" TYPE NAME;
6036 had been seen. Used to create compiler-generated global
6040 declare_global_var (tree name, tree type)
6044 push_to_top_level ();
6045 decl = build_decl (input_location, VAR_DECL, name, type);
6046 TREE_PUBLIC (decl) = 1;
6047 DECL_EXTERNAL (decl) = 1;
6048 DECL_ARTIFICIAL (decl) = 1;
6049 /* If the user has explicitly declared this variable (perhaps
6050 because the code we are compiling is part of a low-level runtime
6051 library), then it is possible that our declaration will be merged
6052 with theirs by pushdecl. */
6053 decl = pushdecl (decl);
6054 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6055 pop_from_top_level ();
6060 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6061 if "__cxa_atexit" is not being used) corresponding to the function
6062 to be called when the program exits. */
6065 get_atexit_fn_ptr_type (void)
6070 if (!atexit_fn_ptr_type_node)
6072 if (flag_use_cxa_atexit
6073 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6074 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6075 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6077 /* The parameter to "atexit" is "void (*)(void)". */
6078 arg_types = void_list_node;
6080 fn_type = build_function_type (void_type_node, arg_types);
6081 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6084 return atexit_fn_ptr_type_node;
6087 /* Returns a pointer to the `atexit' function. Note that if
6088 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6089 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6092 get_atexit_node (void)
6099 bool use_aeabi_atexit;
6104 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6106 /* The declaration for `__cxa_atexit' is:
6108 int __cxa_atexit (void (*)(void *), void *, void *)
6110 We build up the argument types and then then function type
6113 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6114 /* First, build the pointer-to-function type for the first
6116 fn_ptr_type = get_atexit_fn_ptr_type ();
6117 /* Then, build the rest of the argument types. */
6118 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6119 if (use_aeabi_atexit)
6121 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6122 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6126 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6127 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6129 /* And the final __cxa_atexit type. */
6130 fn_type = build_function_type (integer_type_node, arg_types);
6131 fn_ptr_type = build_pointer_type (fn_type);
6132 if (use_aeabi_atexit)
6133 name = "__aeabi_atexit";
6135 name = "__cxa_atexit";
6139 /* The declaration for `atexit' is:
6141 int atexit (void (*)());
6143 We build up the argument types and then then function type
6145 fn_ptr_type = get_atexit_fn_ptr_type ();
6146 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6147 /* Build the final atexit type. */
6148 fn_type = build_function_type (integer_type_node, arg_types);
6152 /* Now, build the function declaration. */
6153 push_lang_context (lang_name_c);
6154 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6155 mark_used (atexit_fndecl);
6156 pop_lang_context ();
6157 atexit_node = decay_conversion (atexit_fndecl);
6162 /* Returns the __dso_handle VAR_DECL. */
6165 get_dso_handle_node (void)
6167 if (dso_handle_node)
6168 return dso_handle_node;
6170 /* Declare the variable. */
6171 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6174 return dso_handle_node;
6177 /* Begin a new function with internal linkage whose job will be simply
6178 to destroy some particular variable. */
6180 static GTY(()) int start_cleanup_cnt;
6183 start_cleanup_fn (void)
6188 bool use_cxa_atexit = flag_use_cxa_atexit
6189 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6191 push_to_top_level ();
6193 /* No need to mangle this. */
6194 push_lang_context (lang_name_c);
6196 /* Build the name of the function. */
6197 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6198 /* Build the function declaration. */
6199 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6200 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6201 /* It's a function with internal linkage, generated by the
6203 TREE_PUBLIC (fndecl) = 0;
6204 DECL_ARTIFICIAL (fndecl) = 1;
6205 /* Make the function `inline' so that it is only emitted if it is
6206 actually needed. It is unlikely that it will be inlined, since
6207 it is only called via a function pointer, but we avoid unnecessary
6208 emissions this way. */
6209 DECL_DECLARED_INLINE_P (fndecl) = 1;
6210 DECL_INTERFACE_KNOWN (fndecl) = 1;
6211 /* Build the parameter. */
6216 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6217 DECL_CONTEXT (parmdecl) = fndecl;
6218 TREE_USED (parmdecl) = 1;
6219 DECL_READ_P (parmdecl) = 1;
6220 DECL_ARGUMENTS (fndecl) = parmdecl;
6224 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6226 pop_lang_context ();
6228 return current_function_decl;
6231 /* Finish the cleanup function begun by start_cleanup_fn. */
6234 end_cleanup_fn (void)
6236 expand_or_defer_fn (finish_function (0));
6238 pop_from_top_level ();
6241 /* Generate code to handle the destruction of DECL, an object with
6242 static storage duration. */
6245 register_dtor_fn (tree decl)
6254 type = TREE_TYPE (decl);
6255 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6256 return void_zero_node;
6258 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6259 a class object, we can just pass the destructor to
6260 "__cxa_atexit"; we don't have to build a temporary function to do
6262 use_dtor = (flag_use_cxa_atexit
6263 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6264 && CLASS_TYPE_P (type));
6269 /* Find the destructor. */
6270 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6271 gcc_assert (idx >= 0);
6272 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6273 /* Make sure it is accessible. */
6274 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6278 /* Call build_cleanup before we enter the anonymous function so
6279 that any access checks will be done relative to the current
6280 scope, rather than the scope of the anonymous function. */
6281 build_cleanup (decl);
6283 /* Now start the function. */
6284 cleanup = start_cleanup_fn ();
6286 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6287 to the original function, rather than the anonymous one. That
6288 will make the back end think that nested functions are in use,
6289 which causes confusion. */
6290 push_deferring_access_checks (dk_no_check);
6291 fcall = build_cleanup (decl);
6292 pop_deferring_access_checks ();
6294 /* Create the body of the anonymous function. */
6295 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6296 finish_expr_stmt (fcall);
6297 finish_compound_stmt (compound_stmt);
6301 /* Call atexit with the cleanup function. */
6302 mark_used (cleanup);
6303 cleanup = build_address (cleanup);
6304 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6310 /* We must convert CLEANUP to the type that "__cxa_atexit"
6312 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6313 /* "__cxa_atexit" will pass the address of DECL to the
6314 cleanup function. */
6316 addr = build_address (decl);
6317 /* The declared type of the parameter to "__cxa_atexit" is
6318 "void *". For plain "T*", we could just let the
6319 machinery in cp_build_function_call convert it -- but if the
6320 type is "cv-qualified T *", then we need to convert it
6321 before passing it in, to avoid spurious errors. */
6322 addr = build_nop (ptr_type_node, addr);
6325 /* Since the cleanup functions we build ignore the address
6326 they're given, there's no reason to pass the actual address
6327 in, and, in general, it's cheaper to pass NULL than any
6329 addr = null_pointer_node;
6330 args = tree_cons (NULL_TREE,
6331 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6332 tf_warning_or_error),
6334 if (targetm.cxx.use_aeabi_atexit ())
6336 args = tree_cons (NULL_TREE, cleanup, args);
6337 args = tree_cons (NULL_TREE, addr, args);
6341 args = tree_cons (NULL_TREE, addr, args);
6342 args = tree_cons (NULL_TREE, cleanup, args);
6346 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6347 return cp_build_function_call (get_atexit_node (), args,
6348 tf_warning_or_error);
6351 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6352 is its initializer. Generate code to handle the construction
6353 and destruction of DECL. */
6356 expand_static_init (tree decl, tree init)
6358 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6359 gcc_assert (TREE_STATIC (decl));
6361 /* Some variables require no initialization. */
6363 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6364 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6367 if (DECL_FUNCTION_SCOPE_P (decl))
6369 /* Emit code to perform this initialization but once. */
6370 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6371 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6372 tree guard, guard_addr;
6373 tree acquire_fn, release_fn, abort_fn;
6376 /* Emit code to perform this initialization but once. This code
6379 static <type> guard;
6380 if (!guard.first_byte) {
6381 if (__cxa_guard_acquire (&guard)) {
6384 // Do initialization.
6385 flag = true; __cxa_guard_release (&guard);
6386 // Register variable for destruction at end of program.
6388 if (!flag) __cxa_guard_abort (&guard);
6392 Note that the `flag' variable is only set to 1 *after* the
6393 initialization is complete. This ensures that an exception,
6394 thrown during the construction, will cause the variable to
6395 reinitialized when we pass through this code again, as per:
6399 If the initialization exits by throwing an exception, the
6400 initialization is not complete, so it will be tried again
6401 the next time control enters the declaration.
6403 This process should be thread-safe, too; multiple threads
6404 should not be able to initialize the variable more than
6407 /* Create the guard variable. */
6408 guard = get_guard (decl);
6410 /* This optimization isn't safe on targets with relaxed memory
6411 consistency. On such targets we force synchronization in
6412 __cxa_guard_acquire. */
6413 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6415 /* Begin the conditional initialization. */
6416 if_stmt = begin_if_stmt ();
6417 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6418 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6421 if (flag_threadsafe_statics)
6423 guard_addr = build_address (guard);
6425 acquire_fn = get_identifier ("__cxa_guard_acquire");
6426 release_fn = get_identifier ("__cxa_guard_release");
6427 abort_fn = get_identifier ("__cxa_guard_abort");
6428 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6430 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6432 tree vfntype = build_function_type (void_type_node, argtypes);
6433 acquire_fn = push_library_fn
6434 (acquire_fn, build_function_type (integer_type_node, argtypes),
6436 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6437 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6441 release_fn = identifier_global_value (release_fn);
6442 abort_fn = identifier_global_value (abort_fn);
6445 inner_if_stmt = begin_if_stmt ();
6446 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6449 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6450 begin = get_target_expr (boolean_false_node);
6451 flag = TARGET_EXPR_SLOT (begin);
6453 TARGET_EXPR_CLEANUP (begin)
6454 = build3 (COND_EXPR, void_type_node, flag,
6456 build_call_n (abort_fn, 1, guard_addr));
6457 CLEANUP_EH_ONLY (begin) = 1;
6459 /* Do the initialization itself. */
6460 init = add_stmt_to_compound (begin, init);
6461 init = add_stmt_to_compound
6462 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6463 init = add_stmt_to_compound
6464 (init, build_call_n (release_fn, 1, guard_addr));
6467 init = add_stmt_to_compound (init, set_guard (guard));
6469 /* Use atexit to register a function for destroying this static
6471 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6473 finish_expr_stmt (init);
6475 if (flag_threadsafe_statics)
6477 finish_compound_stmt (inner_then_clause);
6478 finish_then_clause (inner_if_stmt);
6479 finish_if_stmt (inner_if_stmt);
6482 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6484 finish_compound_stmt (then_clause);
6485 finish_then_clause (if_stmt);
6486 finish_if_stmt (if_stmt);
6490 static_aggregates = tree_cons (init, decl, static_aggregates);
6494 /* Make TYPE a complete type based on INITIAL_VALUE.
6495 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6496 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6497 3 if the initializer list is empty (in pedantic mode). */
6500 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6503 tree type, elt_type;
6507 unsigned HOST_WIDE_INT i;
6510 /* An array of character type can be initialized from a
6511 brace-enclosed string constant.
6513 FIXME: this code is duplicated from reshape_init. Probably
6514 we should just call reshape_init here? */
6515 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6516 && TREE_CODE (initial_value) == CONSTRUCTOR
6517 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6519 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6520 tree value = VEC_index (constructor_elt, v, 0)->value;
6522 if (TREE_CODE (value) == STRING_CST
6523 && VEC_length (constructor_elt, v) == 1)
6524 initial_value = value;
6527 /* If any of the elements are parameter packs, we can't actually
6528 complete this type now because the array size is dependent. */
6529 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6531 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6534 if (PACK_EXPANSION_P (value))
6540 failure = complete_array_type (ptype, initial_value, do_default);
6542 /* We can create the array before the element type is complete, which
6543 means that we didn't have these two bits set in the original type
6544 either. In completing the type, we are expected to propagate these
6545 bits. See also complete_type which does the same thing for arrays
6548 if (TYPE_DOMAIN (type))
6550 elt_type = TREE_TYPE (type);
6551 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6552 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6553 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6559 /* Return zero if something is declared to be a member of type
6560 CTYPE when in the context of CUR_TYPE. STRING is the error
6561 message to print in that case. Otherwise, quietly return 1. */
6564 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6566 if (ctype && ctype != cur_type)
6568 if (flags == DTOR_FLAG)
6569 error ("destructor for alien class %qT cannot be a member", ctype);
6571 error ("constructor for alien class %qT cannot be a member", ctype);
6577 /* Subroutine of `grokdeclarator'. */
6579 /* Generate errors possibly applicable for a given set of specifiers.
6580 This is for ARM $7.1.2. */
6583 bad_specifiers (tree object,
6592 error ("%qD declared as a %<virtual%> %s", object, type);
6594 error ("%qD declared as an %<inline%> %s", object, type);
6596 error ("%<const%> and %<volatile%> function specifiers on "
6597 "%qD invalid in %s declaration",
6600 error ("%q+D declared as a friend", object);
6602 && (TREE_CODE (object) == TYPE_DECL
6603 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6604 && !TYPE_REFFN_P (TREE_TYPE (object))
6605 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6606 error ("%q+D declared with an exception specification", object);
6609 /* DECL is a member function or static data member and is presently
6610 being defined. Check that the definition is taking place in a
6614 check_class_member_definition_namespace (tree decl)
6616 /* These checks only apply to member functions and static data
6618 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6619 || TREE_CODE (decl) == VAR_DECL);
6620 /* We check for problems with specializations in pt.c in
6621 check_specialization_namespace, where we can issue better
6623 if (processing_specialization)
6625 /* There are no restrictions on the placement of
6626 explicit instantiations. */
6627 if (processing_explicit_instantiation)
6631 A member function definition that appears outside of the
6632 class definition shall appear in a namespace scope enclosing
6633 the class definition.
6637 The definition for a static data member shall appear in a
6638 namespace scope enclosing the member's class definition. */
6639 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6640 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6641 decl, DECL_CONTEXT (decl));
6644 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6645 METHOD_TYPE for a non-static member function; QUALS are the
6646 cv-qualifiers that apply to the function. */
6649 build_this_parm (tree type, cp_cv_quals quals)
6654 cp_cv_quals this_quals;
6656 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6657 /* The `this' parameter is implicitly `const'; it cannot be
6659 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6660 qual_type = cp_build_qualified_type (this_type, this_quals);
6661 parm = build_artificial_parm (this_identifier, qual_type);
6662 cp_apply_type_quals_to_decl (this_quals, parm);
6666 /* CTYPE is class type, or null if non-class.
6667 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6669 DECLARATOR is the function's name.
6670 PARMS is a chain of PARM_DECLs for the function.
6671 VIRTUALP is truthvalue of whether the function is virtual or not.
6672 FLAGS are to be passed through to `grokclassfn'.
6673 QUALS are qualifiers indicating whether the function is `const'
6675 RAISES is a list of exceptions that this function can raise.
6676 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6677 not look, and -1 if we should not call `grokclassfn' at all.
6679 SFK is the kind of special function (if any) for the new function.
6681 Returns `NULL_TREE' if something goes wrong, after issuing
6682 applicable error messages. */
6685 grokfndecl (tree ctype,
6689 tree orig_declarator,
6691 enum overload_flags flags,
6698 special_function_kind sfk,
6703 location_t location)
6706 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6710 type = build_exception_variant (type, raises);
6712 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6714 /* If we have an explicit location, use it, otherwise use whatever
6715 build_lang_decl used (probably input_location). */
6716 if (location != UNKNOWN_LOCATION)
6717 DECL_SOURCE_LOCATION (decl) = location;
6719 if (TREE_CODE (type) == METHOD_TYPE)
6722 parm = build_this_parm (type, quals);
6723 TREE_CHAIN (parm) = parms;
6726 DECL_ARGUMENTS (decl) = parms;
6727 for (t = parms; t; t = TREE_CHAIN (t))
6728 DECL_CONTEXT (t) = decl;
6729 /* Propagate volatile out from type to decl. */
6730 if (TYPE_VOLATILE (type))
6731 TREE_THIS_VOLATILE (decl) = 1;
6733 /* Setup decl according to sfk. */
6736 case sfk_constructor:
6737 case sfk_copy_constructor:
6738 case sfk_move_constructor:
6739 DECL_CONSTRUCTOR_P (decl) = 1;
6741 case sfk_destructor:
6742 DECL_DESTRUCTOR_P (decl) = 1;
6748 /* If pointers to member functions use the least significant bit to
6749 indicate whether a function is virtual, ensure a pointer
6750 to this function will have that bit clear. */
6751 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6752 && TREE_CODE (type) == METHOD_TYPE
6753 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6754 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6757 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6761 ("defining explicit specialization %qD in friend declaration",
6765 tree fns = TREE_OPERAND (orig_declarator, 0);
6766 tree args = TREE_OPERAND (orig_declarator, 1);
6768 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6770 /* Something like `template <class T> friend void f<T>()'. */
6771 error ("invalid use of template-id %qD in declaration "
6772 "of primary template",
6778 /* A friend declaration of the form friend void f<>(). Record
6779 the information in the TEMPLATE_ID_EXPR. */
6780 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6782 if (TREE_CODE (fns) == COMPONENT_REF)
6784 /* Due to bison parser ickiness, we will have already looked
6785 up an operator_name or PFUNCNAME within the current class
6786 (see template_id in parse.y). If the current class contains
6787 such a name, we'll get a COMPONENT_REF here. Undo that. */
6789 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6790 == current_class_type);
6791 fns = TREE_OPERAND (fns, 1);
6793 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6794 || TREE_CODE (fns) == OVERLOAD);
6795 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6797 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6798 if (TREE_PURPOSE (t)
6799 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6801 error ("default arguments are not allowed in declaration "
6802 "of friend template specialization %qD",
6809 error ("%<inline%> is not allowed in declaration of friend "
6810 "template specialization %qD",
6817 /* If this decl has namespace scope, set that up. */
6819 set_decl_namespace (decl, in_namespace, friendp);
6821 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6823 /* `main' and builtins have implicit 'C' linkage. */
6824 if ((MAIN_NAME_P (declarator)
6825 || (IDENTIFIER_LENGTH (declarator) > 10
6826 && IDENTIFIER_POINTER (declarator)[0] == '_'
6827 && IDENTIFIER_POINTER (declarator)[1] == '_'
6828 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6829 && current_lang_name == lang_name_cplusplus
6830 && ctype == NULL_TREE
6831 /* NULL_TREE means global namespace. */
6832 && DECL_CONTEXT (decl) == NULL_TREE)
6833 SET_DECL_LANGUAGE (decl, lang_c);
6835 /* Should probably propagate const out from type to decl I bet (mrs). */
6838 DECL_STATIC_FUNCTION_P (decl) = 1;
6839 DECL_CONTEXT (decl) = ctype;
6844 DECL_CONTEXT (decl) = ctype;
6846 check_class_member_definition_namespace (decl);
6849 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6851 if (processing_template_decl)
6852 error ("cannot declare %<::main%> to be a template");
6854 error ("cannot declare %<::main%> to be inline");
6856 error ("cannot declare %<::main%> to be static");
6861 /* Members of anonymous types and local classes have no linkage; make
6862 them internal. If a typedef is made later, this will be changed. */
6863 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6864 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6867 if (publicp && cxx_dialect == cxx98)
6869 /* [basic.link]: A name with no linkage (notably, the name of a class
6870 or enumeration declared in a local scope) shall not be used to
6871 declare an entity with linkage.
6873 DR 757 relaxes this restriction for C++0x. */
6874 t = no_linkage_check (TREE_TYPE (decl),
6875 /*relaxed_p=*/false);
6878 if (TYPE_ANONYMOUS_P (t))
6880 if (DECL_EXTERN_C_P (decl))
6881 /* Allow this; it's pretty common in C. */;
6884 permerror (input_location, "anonymous type with no linkage "
6885 "used to declare function %q#D with linkage",
6887 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6888 permerror (input_location, "%q+#D does not refer to the unqualified "
6889 "type, so it is not used for linkage",
6894 permerror (input_location, "type %qT with no linkage used to "
6895 "declare function %q#D with linkage", t, decl);
6899 TREE_PUBLIC (decl) = publicp;
6902 DECL_INTERFACE_KNOWN (decl) = 1;
6903 DECL_NOT_REALLY_EXTERN (decl) = 1;
6906 /* If the declaration was declared inline, mark it as such. */
6908 DECL_DECLARED_INLINE_P (decl) = 1;
6910 DECL_EXTERNAL (decl) = 1;
6911 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6914 ? G_("static member function %qD cannot have cv-qualifier")
6915 : G_("non-member function %qD cannot have cv-qualifier"),
6917 quals = TYPE_UNQUALIFIED;
6920 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6921 && !grok_op_properties (decl, /*complain=*/true))
6925 /* Make the init_value nonzero so pushdecl knows this is not
6926 tentative. error_mark_node is replaced later with the BLOCK. */
6927 DECL_INITIAL (decl) = error_mark_node;
6929 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6930 TREE_NOTHROW (decl) = 1;
6932 /* Caller will do the rest of this. */
6936 if (ctype != NULL_TREE)
6937 grokclassfn (ctype, decl, flags);
6939 decl = check_explicit_specialization (orig_declarator, decl,
6942 4 * (friendp != 0));
6943 if (decl == error_mark_node)
6948 cplus_decl_attributes (&decl, *attrlist, 0);
6949 *attrlist = NULL_TREE;
6952 /* Check main's type after attributes have been applied. */
6953 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6955 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6958 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6960 error ("%<::main%> must return %<int%>");
6961 newtype = build_function_type (integer_type_node, oldtypeargs);
6962 TREE_TYPE (decl) = newtype;
6965 check_main_parameter_types (decl);
6968 if (ctype != NULL_TREE
6969 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6972 tree old_decl = check_classfn (ctype, decl,
6973 (processing_template_decl
6974 > template_class_depth (ctype))
6975 ? current_template_parms
6978 if (old_decl == error_mark_node)
6986 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6987 /* Because grokfndecl is always supposed to return a
6988 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6989 here. We depend on our callers to figure out that its
6990 really a template that's being returned. */
6991 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6993 if (DECL_STATIC_FUNCTION_P (old_decl)
6994 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6995 /* Remove the `this' parm added by grokclassfn.
6996 XXX Isn't this done in start_function, too? */
6997 revert_static_member_fn (decl);
6998 if (DECL_ARTIFICIAL (old_decl))
7000 error ("definition of implicitly-declared %qD", old_decl);
7004 /* Since we've smashed OLD_DECL to its
7005 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7006 if (TREE_CODE (decl) == TEMPLATE_DECL)
7007 decl = DECL_TEMPLATE_RESULT (decl);
7009 /* Attempt to merge the declarations. This can fail, in
7010 the case of some invalid specialization declarations. */
7011 pushed_scope = push_scope (ctype);
7012 ok = duplicate_decls (decl, old_decl, friendp);
7014 pop_scope (pushed_scope);
7017 error ("no %q#D member function declared in class %qT",
7025 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7028 if (ctype == NULL_TREE || check)
7032 DECL_VIRTUAL_P (decl) = 1;
7037 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7038 the linkage that DECL will receive in the object file. */
7041 set_linkage_for_static_data_member (tree decl)
7043 /* A static data member always has static storage duration and
7044 external linkage. Note that static data members are forbidden in
7045 local classes -- the only situation in which a class has
7046 non-external linkage. */
7047 TREE_PUBLIC (decl) = 1;
7048 TREE_STATIC (decl) = 1;
7049 /* For non-template classes, static data members are always put
7050 out in exactly those files where they are defined, just as
7051 with ordinary namespace-scope variables. */
7052 if (!processing_template_decl)
7053 DECL_INTERFACE_KNOWN (decl) = 1;
7056 /* Create a VAR_DECL named NAME with the indicated TYPE.
7058 If SCOPE is non-NULL, it is the class type or namespace containing
7059 the variable. If SCOPE is NULL, the variable should is created in
7060 the innermost enclosings scope. */
7063 grokvardecl (tree type,
7065 const cp_decl_specifier_seq *declspecs,
7071 tree explicit_scope;
7073 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7075 /* Compute the scope in which to place the variable, but remember
7076 whether or not that scope was explicitly specified by the user. */
7077 explicit_scope = scope;
7080 /* An explicit "extern" specifier indicates a namespace-scope
7082 if (declspecs->storage_class == sc_extern)
7083 scope = current_decl_namespace ();
7084 else if (!at_function_scope_p ())
7085 scope = current_scope ();
7089 && (/* If the variable is a namespace-scope variable declared in a
7090 template, we need DECL_LANG_SPECIFIC. */
7091 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7092 /* Similarly for namespace-scope variables with language linkage
7094 || (TREE_CODE (scope) == NAMESPACE_DECL
7095 && current_lang_name != lang_name_cplusplus)
7096 /* Similarly for static data members. */
7098 decl = build_lang_decl (VAR_DECL, name, type);
7100 decl = build_decl (input_location, VAR_DECL, name, type);
7102 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7103 set_decl_namespace (decl, explicit_scope, 0);
7105 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7107 if (declspecs->storage_class == sc_extern)
7109 DECL_THIS_EXTERN (decl) = 1;
7110 DECL_EXTERNAL (decl) = !initialized;
7113 if (DECL_CLASS_SCOPE_P (decl))
7115 set_linkage_for_static_data_member (decl);
7116 /* This function is only called with out-of-class definitions. */
7117 DECL_EXTERNAL (decl) = 0;
7118 check_class_member_definition_namespace (decl);
7120 /* At top level, either `static' or no s.c. makes a definition
7121 (perhaps tentative), and absence of `static' makes it public. */
7122 else if (toplevel_bindings_p ())
7124 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7125 && (DECL_THIS_EXTERN (decl) || ! constp));
7126 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7128 /* Not at top level, only `static' makes a static definition. */
7131 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7132 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7135 if (declspecs->specs[(int)ds_thread])
7136 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7138 /* If the type of the decl has no linkage, make sure that we'll
7139 notice that in mark_used. */
7140 if (cxx_dialect > cxx98
7141 && decl_linkage (decl) != lk_none
7142 && DECL_LANG_SPECIFIC (decl) == NULL
7143 && !DECL_EXTERN_C_P (decl)
7144 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7145 retrofit_lang_decl (decl);
7147 if (TREE_PUBLIC (decl))
7149 /* [basic.link]: A name with no linkage (notably, the name of a class
7150 or enumeration declared in a local scope) shall not be used to
7151 declare an entity with linkage.
7153 DR 757 relaxes this restriction for C++0x. */
7154 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7155 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7158 if (TYPE_ANONYMOUS_P (t))
7160 if (DECL_EXTERN_C_P (decl))
7161 /* Allow this; it's pretty common in C. */
7165 /* DRs 132, 319 and 389 seem to indicate types with
7166 no linkage can only be used to declare extern "C"
7167 entities. Since it's not always an error in the
7168 ISO C++ 90 Standard, we only issue a warning. */
7169 warning (0, "anonymous type with no linkage used to declare "
7170 "variable %q#D with linkage", decl);
7171 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7172 warning (0, "%q+#D does not refer to the unqualified "
7173 "type, so it is not used for linkage",
7178 warning (0, "type %qT with no linkage used to declare variable "
7179 "%q#D with linkage", t, decl);
7183 DECL_INTERFACE_KNOWN (decl) = 1;
7188 /* Create and return a canonical pointer to member function type, for
7189 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7192 build_ptrmemfunc_type (tree type)
7196 tree unqualified_variant = NULL_TREE;
7198 if (type == error_mark_node)
7201 /* If a canonical type already exists for this type, use it. We use
7202 this method instead of type_hash_canon, because it only does a
7203 simple equality check on the list of field members. */
7205 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7208 /* Make sure that we always have the unqualified pointer-to-member
7210 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7212 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7214 t = make_class_type (RECORD_TYPE);
7215 xref_basetypes (t, NULL_TREE);
7217 /* Let the front end know this is a pointer to member function... */
7218 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7219 /* ... and not really a class type. */
7220 SET_CLASS_TYPE_P (t, 0);
7222 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7225 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7227 TREE_CHAIN (field) = fields;
7230 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7232 /* Zap out the name so that the back end will give us the debugging
7233 information for this anonymous RECORD_TYPE. */
7234 TYPE_NAME (t) = NULL_TREE;
7236 /* If this is not the unqualified form of this pointer-to-member
7237 type, set the TYPE_MAIN_VARIANT for this type to be the
7238 unqualified type. Since they are actually RECORD_TYPEs that are
7239 not variants of each other, we must do this manually.
7240 As we just built a new type there is no need to do yet another copy. */
7241 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7243 int type_quals = cp_type_quals (type);
7244 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7245 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7246 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7247 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7248 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7249 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7250 TREE_TYPE (TYPE_BINFO (t)) = t;
7253 /* Cache this pointer-to-member type so that we can find it again
7255 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7257 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7258 SET_TYPE_STRUCTURAL_EQUALITY (t);
7259 else if (TYPE_CANONICAL (type) != type)
7260 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7265 /* Create and return a pointer to data member type. */
7268 build_ptrmem_type (tree class_type, tree member_type)
7270 if (TREE_CODE (member_type) == METHOD_TYPE)
7272 tree arg_types = TYPE_ARG_TYPES (member_type);
7273 cp_cv_quals quals = cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)));
7274 member_type = build_memfn_type (member_type, class_type, quals);
7275 return build_ptrmemfunc_type (build_pointer_type (member_type));
7279 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7280 return build_offset_type (class_type, member_type);
7284 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7285 Check to see that the definition is valid. Issue appropriate error
7286 messages. Return 1 if the definition is particularly bad, or 0
7290 check_static_variable_definition (tree decl, tree type)
7292 /* Motion 10 at San Diego: If a static const integral data member is
7293 initialized with an integral constant expression, the initializer
7294 may appear either in the declaration (within the class), or in
7295 the definition, but not both. If it appears in the class, the
7296 member is a member constant. The file-scope definition is always
7298 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7300 error ("invalid in-class initialization of static data member "
7301 "of non-integral type %qT",
7303 /* If we just return the declaration, crashes will sometimes
7304 occur. We therefore return void_type_node, as if this were a
7305 friend declaration, to cause callers to completely ignore
7306 this declaration. */
7309 else if (!CP_TYPE_CONST_P (type))
7310 error ("ISO C++ forbids in-class initialization of non-const "
7311 "static member %qD",
7313 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7314 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7315 "%qD of non-integral type %qT", decl, type);
7320 /* Given the SIZE (i.e., number of elements) in an array, compute an
7321 appropriate index type for the array. If non-NULL, NAME is the
7322 name of the thing being declared. */
7325 compute_array_index_type (tree name, tree size)
7329 tree abi_1_itype = NULL_TREE;
7331 if (error_operand_p (size))
7332 return error_mark_node;
7334 type = TREE_TYPE (size);
7335 /* The array bound must be an integer type. */
7336 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7339 error ("size of array %qD has non-integral type %qT", name, type);
7341 error ("size of array has non-integral type %qT", type);
7342 size = integer_one_node;
7343 type = TREE_TYPE (size);
7346 /* We can only call value_dependent_expression_p on integral constant
7347 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7348 set if this isn't one. */
7349 if (processing_template_decl
7350 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7352 /* We cannot do any checking for a SIZE that isn't known to be
7353 constant. Just build the index type and mark that it requires
7354 structural equality checks. */
7355 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7356 size, integer_one_node));
7357 TYPE_DEPENDENT_P (itype) = 1;
7358 TYPE_DEPENDENT_P_VALID (itype) = 1;
7359 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7363 if (!abi_version_at_least (2) && processing_template_decl)
7364 /* For abi-1, we handled all instances in templates the same way,
7365 even when they were non-dependent. This affects the manglings
7366 produced. So, we do the normal checking for non-dependent
7367 sizes, but at the end we'll return the same type that abi-1
7368 would have, but with TYPE_CANONICAL set to the "right"
7369 value that the current ABI would provide. */
7370 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7371 size, integer_one_node));
7373 /* The size might be the result of a cast. */
7374 STRIP_TYPE_NOPS (size);
7376 /* It might be a const variable or enumeration constant. */
7377 size = integral_constant_value (size);
7378 if (error_operand_p (size))
7379 return error_mark_node;
7381 /* Normally, the array-bound will be a constant. */
7382 if (TREE_CODE (size) == INTEGER_CST)
7384 /* Check to see if the array bound overflowed. Make that an
7385 error, no matter how generous we're being. */
7386 constant_expression_error (size);
7388 /* An array must have a positive number of elements. */
7389 if (INT_CST_LT (size, integer_zero_node))
7392 error ("size of array %qD is negative", name);
7394 error ("size of array is negative");
7395 size = integer_one_node;
7397 /* As an extension we allow zero-sized arrays. We always allow
7398 them in system headers because glibc uses them. */
7399 else if (integer_zerop (size) && !in_system_header)
7402 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7404 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7407 else if (TREE_CONSTANT (size))
7409 /* `(int) &fn' is not a valid array bound. */
7411 error ("size of array %qD is not an integral constant-expression",
7414 error ("size of array is not an integral constant-expression");
7415 size = integer_one_node;
7417 else if (pedantic && warn_vla != 0)
7420 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7422 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7424 else if (warn_vla > 0)
7428 "variable length array %qD is used", name);
7431 "variable length array is used");
7434 if (processing_template_decl && !TREE_CONSTANT (size))
7435 /* A variable sized array. */
7436 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7439 HOST_WIDE_INT saved_processing_template_decl;
7441 /* Compute the index of the largest element in the array. It is
7442 one less than the number of elements in the array. We save
7443 and restore PROCESSING_TEMPLATE_DECL so that computations in
7444 cp_build_binary_op will be appropriately folded. */
7445 saved_processing_template_decl = processing_template_decl;
7446 processing_template_decl = 0;
7447 itype = cp_build_binary_op (input_location,
7449 cp_convert (ssizetype, size),
7450 cp_convert (ssizetype, integer_one_node),
7451 tf_warning_or_error);
7452 itype = fold (itype);
7453 processing_template_decl = saved_processing_template_decl;
7455 if (!TREE_CONSTANT (itype))
7456 /* A variable sized array. */
7457 itype = variable_size (itype);
7458 /* Make sure that there was no overflow when creating to a signed
7459 index type. (For example, on a 32-bit machine, an array with
7460 size 2^32 - 1 is too big.) */
7461 else if (TREE_CODE (itype) == INTEGER_CST
7462 && TREE_OVERFLOW (itype))
7464 error ("overflow in array dimension");
7465 TREE_OVERFLOW (itype) = 0;
7469 /* Create and return the appropriate index type. */
7472 tree t = build_index_type (itype);
7473 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7477 return build_index_type (itype);
7480 /* Returns the scope (if any) in which the entity declared by
7481 DECLARATOR will be located. If the entity was declared with an
7482 unqualified name, NULL_TREE is returned. */
7485 get_scope_of_declarator (const cp_declarator *declarator)
7487 while (declarator && declarator->kind != cdk_id)
7488 declarator = declarator->declarator;
7490 /* If the declarator-id is a SCOPE_REF, the scope in which the
7491 declaration occurs is the first operand. */
7493 && declarator->u.id.qualifying_scope)
7494 return declarator->u.id.qualifying_scope;
7496 /* Otherwise, the declarator is not a qualified name; the entity will
7497 be declared in the current scope. */
7501 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7502 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7506 create_array_type_for_decl (tree name, tree type, tree size)
7508 tree itype = NULL_TREE;
7510 /* If things have already gone awry, bail now. */
7511 if (type == error_mark_node || size == error_mark_node)
7512 return error_mark_node;
7514 /* If there are some types which cannot be array elements,
7515 issue an error-message and return. */
7516 switch (TREE_CODE (type))
7520 error ("declaration of %qD as array of void", name);
7522 error ("creating array of void");
7523 return error_mark_node;
7527 error ("declaration of %qD as array of functions", name);
7529 error ("creating array of functions");
7530 return error_mark_node;
7532 case REFERENCE_TYPE:
7534 error ("declaration of %qD as array of references", name);
7536 error ("creating array of references");
7537 return error_mark_node;
7541 error ("declaration of %qD as array of function members", name);
7543 error ("creating array of function members");
7544 return error_mark_node;
7552 The constant expressions that specify the bounds of the arrays
7553 can be omitted only for the first member of the sequence. */
7554 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7557 error ("declaration of %qD as multidimensional array must "
7558 "have bounds for all dimensions except the first",
7561 error ("multidimensional array must have bounds for all "
7562 "dimensions except the first");
7564 return error_mark_node;
7567 /* Figure out the index type for the array. */
7569 itype = compute_array_index_type (name, size);
7572 T is called the array element type; this type shall not be [...] an
7573 abstract class type. */
7574 abstract_virtuals_error (name, type);
7576 return build_cplus_array_type (type, itype);
7579 /* Check that it's OK to declare a function with the indicated TYPE.
7580 SFK indicates the kind of special function (if any) that this
7581 function is. OPTYPE is the type given in a conversion operator
7582 declaration, or the class type for a constructor/destructor.
7583 Returns the actual return type of the function; that
7584 may be different than TYPE if an error occurs, or for certain
7585 special functions. */
7588 check_special_function_return_type (special_function_kind sfk,
7594 case sfk_constructor:
7596 error ("return type specification for constructor invalid");
7598 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7599 type = build_pointer_type (optype);
7601 type = void_type_node;
7604 case sfk_destructor:
7606 error ("return type specification for destructor invalid");
7607 /* We can't use the proper return type here because we run into
7608 problems with ambiguous bases and covariant returns.
7609 Java classes are left unchanged because (void *) isn't a valid
7610 Java type, and we don't want to change the Java ABI. */
7611 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7612 type = build_pointer_type (void_type_node);
7614 type = void_type_node;
7617 case sfk_conversion:
7619 error ("return type specified for %<operator %T%>", optype);
7630 /* A variable or data member (whose unqualified name is IDENTIFIER)
7631 has been declared with the indicated TYPE. If the TYPE is not
7632 acceptable, issue an error message and return a type to use for
7633 error-recovery purposes. */
7636 check_var_type (tree identifier, tree type)
7638 if (VOID_TYPE_P (type))
7641 error ("unnamed variable or field declared void");
7642 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7644 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7645 error ("variable or field %qE declared void", identifier);
7648 error ("variable or field declared void");
7649 type = error_mark_node;
7655 /* Given declspecs and a declarator (abstract or otherwise), determine
7656 the name and type of the object declared and construct a DECL node
7659 DECLSPECS points to the representation of declaration-specifier
7660 sequence that precedes declarator.
7662 DECL_CONTEXT says which syntactic context this declaration is in:
7663 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7664 FUNCDEF for a function definition. Like NORMAL but a few different
7665 error messages in each case. Return value may be zero meaning
7666 this definition is too screwy to try to parse.
7667 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7668 handle member functions (which have FIELD context).
7669 Return value may be zero meaning this definition is too screwy to
7671 PARM for a parameter declaration (either within a function prototype
7672 or before a function body). Make a PARM_DECL, or return void_type_node.
7673 TPARM for a template parameter declaration.
7674 CATCHPARM for a parameter declaration before a catch clause.
7675 TYPENAME if for a typename (in a cast or sizeof).
7676 Don't make a DECL node; just return the ..._TYPE node.
7677 FIELD for a struct or union field; make a FIELD_DECL.
7678 BITFIELD for a field with specified width.
7680 INITIALIZED is as for start_decl.
7682 ATTRLIST is a pointer to the list of attributes, which may be NULL
7683 if there are none; *ATTRLIST may be modified if attributes from inside
7684 the declarator should be applied to the declaration.
7686 When this function is called, scoping variables (such as
7687 CURRENT_CLASS_TYPE) should reflect the scope in which the
7688 declaration occurs, not the scope in which the new declaration will
7689 be placed. For example, on:
7693 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7696 Returns a DECL (if a declarator is present), a TYPE (if there is no
7697 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7701 grokdeclarator (const cp_declarator *declarator,
7702 const cp_decl_specifier_seq *declspecs,
7703 enum decl_context decl_context,
7707 tree type = NULL_TREE;
7709 int virtualp, explicitp, friendp, inlinep, staticp;
7710 int explicit_int = 0;
7711 int explicit_char = 0;
7712 int defaulted_int = 0;
7713 tree dependent_name = NULL_TREE;
7715 tree typedef_decl = NULL_TREE;
7716 const char *name = NULL;
7717 tree typedef_type = NULL_TREE;
7718 /* True if this declarator is a function definition. */
7719 bool funcdef_flag = false;
7720 cp_declarator_kind innermost_code = cdk_error;
7723 /* See the code below that used this. */
7724 tree decl_attr = NULL_TREE;
7727 /* Keep track of what sort of function is being processed
7728 so that we can warn about default return values, or explicit
7729 return values which do not match prescribed defaults. */
7730 special_function_kind sfk = sfk_none;
7732 tree dname = NULL_TREE;
7733 tree ctor_return_type = NULL_TREE;
7734 enum overload_flags flags = NO_SPECIAL;
7735 /* cv-qualifiers that apply to the declarator, for a declaration of
7736 a member function. */
7737 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7738 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7740 tree raises = NULL_TREE;
7741 int template_count = 0;
7742 tree returned_attrs = NULL_TREE;
7743 tree parms = NULL_TREE;
7744 const cp_declarator *id_declarator;
7745 /* The unqualified name of the declarator; either an
7746 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7747 tree unqualified_id;
7748 /* The class type, if any, in which this entity is located,
7749 or NULL_TREE if none. Note that this value may be different from
7750 the current class type; for example if an attempt is made to declare
7751 "A::f" inside "B", this value will be "A". */
7752 tree ctype = current_class_type;
7753 /* The NAMESPACE_DECL for the namespace in which this entity is
7754 located. If an unqualified name is used to declare the entity,
7755 this value will be NULL_TREE, even if the entity is located at
7757 tree in_namespace = NULL_TREE;
7758 cp_storage_class storage_class;
7759 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7760 bool type_was_error_mark_node = false;
7761 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7762 bool template_type_arg = false;
7763 bool template_parm_flag = false;
7764 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7767 signed_p = declspecs->specs[(int)ds_signed];
7768 unsigned_p = declspecs->specs[(int)ds_unsigned];
7769 short_p = declspecs->specs[(int)ds_short];
7770 long_p = declspecs->specs[(int)ds_long];
7771 longlong = declspecs->specs[(int)ds_long] >= 2;
7772 thread_p = declspecs->specs[(int)ds_thread];
7774 if (decl_context == FUNCDEF)
7775 funcdef_flag = true, decl_context = NORMAL;
7776 else if (decl_context == MEMFUNCDEF)
7777 funcdef_flag = true, decl_context = FIELD;
7778 else if (decl_context == BITFIELD)
7779 bitfield = 1, decl_context = FIELD;
7780 else if (decl_context == TEMPLATE_TYPE_ARG)
7781 template_type_arg = true, decl_context = TYPENAME;
7782 else if (decl_context == TPARM)
7783 template_parm_flag = true, decl_context = PARM;
7785 if (initialized > 1)
7786 funcdef_flag = true;
7788 /* Look inside a declarator for the name being declared
7789 and get it as a string, for an error message. */
7790 for (id_declarator = declarator;
7792 id_declarator = id_declarator->declarator)
7794 if (id_declarator->kind != cdk_id)
7795 innermost_code = id_declarator->kind;
7797 switch (id_declarator->kind)
7800 if (id_declarator->declarator
7801 && id_declarator->declarator->kind == cdk_id)
7803 sfk = id_declarator->declarator->u.id.sfk;
7804 if (sfk == sfk_destructor)
7811 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7812 tree decl = id_declarator->u.id.unqualified_name;
7815 if (qualifying_scope)
7817 if (at_function_scope_p ())
7821 A declarator-id shall not be qualified except
7824 None of the cases are permitted in block
7826 if (qualifying_scope == global_namespace)
7827 error ("invalid use of qualified-name %<::%D%>",
7829 else if (TYPE_P (qualifying_scope))
7830 error ("invalid use of qualified-name %<%T::%D%>",
7831 qualifying_scope, decl);
7833 error ("invalid use of qualified-name %<%D::%D%>",
7834 qualifying_scope, decl);
7835 return error_mark_node;
7837 else if (TYPE_P (qualifying_scope))
7839 ctype = qualifying_scope;
7840 if (innermost_code != cdk_function
7841 && current_class_type
7842 && !UNIQUELY_DERIVED_FROM_P (ctype,
7843 current_class_type))
7845 error ("type %qT is not derived from type %qT",
7846 ctype, current_class_type);
7847 return error_mark_node;
7850 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7851 in_namespace = qualifying_scope;
7853 switch (TREE_CODE (decl))
7859 if (innermost_code != cdk_function)
7861 error ("declaration of %qD as non-function", decl);
7862 return error_mark_node;
7864 else if (!qualifying_scope
7865 && !(current_class_type && at_class_scope_p ()))
7867 error ("declaration of %qD as non-member", decl);
7868 return error_mark_node;
7871 type = TREE_OPERAND (decl, 0);
7873 type = constructor_name (type);
7874 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7879 case TEMPLATE_ID_EXPR:
7881 tree fns = TREE_OPERAND (decl, 0);
7884 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7886 gcc_assert (is_overloaded_fn (dname));
7887 dname = DECL_NAME (get_first_fn (dname));
7892 case IDENTIFIER_NODE:
7893 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7896 if (C_IS_RESERVED_WORD (dname))
7898 error ("declarator-id missing; using reserved word %qD",
7900 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7902 else if (!IDENTIFIER_TYPENAME_P (dname))
7903 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7906 gcc_assert (flags == NO_SPECIAL);
7907 flags = TYPENAME_FLAG;
7908 ctor_return_type = TREE_TYPE (dname);
7909 sfk = sfk_conversion;
7910 if (is_typename_at_global_scope (dname))
7911 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7913 name = "<invalid operator>";
7930 return error_mark_node;
7935 if (id_declarator->kind == cdk_id)
7941 The declarator in a function-definition shall have the form
7942 D1 ( parameter-declaration-clause) ... */
7943 if (funcdef_flag && innermost_code != cdk_function)
7945 error ("function definition does not declare parameters");
7946 return error_mark_node;
7949 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7950 && innermost_code != cdk_function
7951 && ! (ctype && !declspecs->any_specifiers_p))
7953 error ("declaration of %qD as non-function", dname);
7954 return error_mark_node;
7957 /* Anything declared one level down from the top level
7958 must be one of the parameters of a function
7959 (because the body is at least two levels down). */
7961 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7962 by not allowing C++ class definitions to specify their parameters
7963 with xdecls (must be spec.d in the parmlist).
7965 Since we now wait to push a class scope until we are sure that
7966 we are in a legitimate method context, we must set oldcname
7967 explicitly (since current_class_name is not yet alive).
7969 We also want to avoid calling this a PARM if it is in a namespace. */
7971 if (decl_context == NORMAL && !toplevel_bindings_p ())
7973 struct cp_binding_level *b = current_binding_level;
7974 current_binding_level = b->level_chain;
7975 if (current_binding_level != 0 && toplevel_bindings_p ())
7976 decl_context = PARM;
7977 current_binding_level = b;
7981 name = decl_context == PARM ? "parameter" : "type name";
7983 /* If there were multiple types specified in the decl-specifier-seq,
7984 issue an error message. */
7985 if (declspecs->multiple_types_p)
7987 error ("two or more data types in declaration of %qs", name);
7988 return error_mark_node;
7991 if (declspecs->conflicting_specifiers_p)
7993 error ("conflicting specifiers in declaration of %qs", name);
7994 return error_mark_node;
7997 /* Extract the basic type from the decl-specifier-seq. */
7998 type = declspecs->type;
7999 if (type == error_mark_node)
8002 type_was_error_mark_node = true;
8004 /* If the entire declaration is itself tagged as deprecated then
8005 suppress reports of deprecated items. */
8006 if (type && TREE_DEPRECATED (type)
8007 && deprecated_state != DEPRECATED_SUPPRESS)
8008 warn_deprecated_use (type, NULL_TREE);
8009 if (type && TREE_CODE (type) == TYPE_DECL)
8011 typedef_decl = type;
8012 type = TREE_TYPE (typedef_decl);
8013 if (TREE_DEPRECATED (type)
8014 && DECL_ARTIFICIAL (typedef_decl)
8015 && deprecated_state != DEPRECATED_SUPPRESS)
8016 warn_deprecated_use (type, NULL_TREE);
8018 /* No type at all: default to `int', and set DEFAULTED_INT
8019 because it was not a user-defined typedef. */
8020 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8022 /* These imply 'int'. */
8023 type = integer_type_node;
8027 explicit_int = declspecs->explicit_int_p;
8028 explicit_char = declspecs->explicit_char_p;
8031 /* See the code below that used this. */
8033 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8035 typedef_type = type;
8038 if (sfk != sfk_conversion)
8039 ctor_return_type = ctype;
8041 if (sfk != sfk_none)
8042 type = check_special_function_return_type (sfk, type,
8044 else if (type == NULL_TREE)
8050 /* We handle `main' specially here, because 'main () { }' is so
8051 common. With no options, it is allowed. With -Wreturn-type,
8052 it is a warning. It is only an error with -pedantic-errors. */
8053 is_main = (funcdef_flag
8054 && dname && MAIN_NAME_P (dname)
8055 && ctype == NULL_TREE
8056 && in_namespace == NULL_TREE
8057 && current_namespace == global_namespace);
8059 if (type_was_error_mark_node)
8060 /* We've already issued an error, don't complain more. */;
8061 else if (in_system_header || flag_ms_extensions)
8062 /* Allow it, sigh. */;
8064 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8066 pedwarn (input_location, OPT_pedantic,
8067 "ISO C++ forbids declaration of %qs with no type", name);
8069 warning (OPT_Wreturn_type,
8070 "ISO C++ forbids declaration of %qs with no type", name);
8072 type = integer_type_node;
8077 /* Now process the modifiers that were specified
8078 and check for invalid combinations. */
8080 /* Long double is a special combination. */
8081 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8084 type = build_qualified_type (long_double_type_node,
8085 cp_type_quals (type));
8088 /* Check all other uses of type modifiers. */
8090 if (unsigned_p || signed_p || long_p || short_p)
8094 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8095 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8096 else if (signed_p && unsigned_p)
8097 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8098 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8099 error ("%<long long%> invalid for %qs", name);
8100 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8101 error ("%<long%> invalid for %qs", name);
8102 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8103 error ("%<short%> invalid for %qs", name);
8104 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8105 error ("%<long%> or %<short%> invalid for %qs", name);
8106 else if ((long_p || short_p) && explicit_char)
8107 error ("%<long%> or %<short%> specified with char for %qs", name);
8108 else if (long_p && short_p)
8109 error ("%<long%> and %<short%> specified together for %qs", name);
8110 else if (type == char16_type_node || type == char32_type_node)
8112 if (signed_p || unsigned_p)
8113 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8114 else if (short_p || long_p)
8115 error ("%<short%> or %<long%> invalid for %qs", name);
8120 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8122 pedwarn (input_location, OPT_pedantic,
8123 "long, short, signed or unsigned used invalidly for %qs",
8125 if (flag_pedantic_errors)
8130 /* Discard the type modifiers if they are invalid. */
8141 /* Decide whether an integer type is signed or not.
8142 Optionally treat bitfields as signed by default. */
8146 It is implementation-defined whether a plain (neither
8147 explicitly signed or unsigned) char, short, int, or long
8148 bit-field is signed or unsigned.
8150 Naturally, we extend this to long long as well. Note that
8151 this does not include wchar_t. */
8152 || (bitfield && !flag_signed_bitfields
8154 /* A typedef for plain `int' without `signed' can be
8155 controlled just like plain `int', but a typedef for
8156 `signed int' cannot be so controlled. */
8158 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8159 && TREE_CODE (type) == INTEGER_TYPE
8160 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8163 type = long_long_unsigned_type_node;
8165 type = long_unsigned_type_node;
8167 type = short_unsigned_type_node;
8168 else if (type == char_type_node)
8169 type = unsigned_char_type_node;
8170 else if (typedef_decl)
8171 type = unsigned_type_for (type);
8173 type = unsigned_type_node;
8175 else if (signed_p && type == char_type_node)
8176 type = signed_char_type_node;
8178 type = long_long_integer_type_node;
8180 type = long_integer_type_node;
8182 type = short_integer_type_node;
8184 if (declspecs->specs[(int)ds_complex])
8186 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8187 error ("complex invalid for %qs", name);
8188 /* If we just have "complex", it is equivalent to
8189 "complex double", but if any modifiers at all are specified it is
8190 the complex form of TYPE. E.g, "complex short" is
8191 "complex short int". */
8193 else if (defaulted_int && ! longlong
8194 && ! (long_p || short_p || signed_p || unsigned_p))
8195 type = complex_double_type_node;
8196 else if (type == integer_type_node)
8197 type = complex_integer_type_node;
8198 else if (type == float_type_node)
8199 type = complex_float_type_node;
8200 else if (type == double_type_node)
8201 type = complex_double_type_node;
8202 else if (type == long_double_type_node)
8203 type = complex_long_double_type_node;
8205 type = build_complex_type (type);
8208 type_quals = TYPE_UNQUALIFIED;
8209 if (declspecs->specs[(int)ds_const])
8210 type_quals |= TYPE_QUAL_CONST;
8211 /* A `constexpr' specifier used in an object declaration declares
8212 the object as `const'. */
8215 if (innermost_code == cdk_function)
8217 else if (declspecs->specs[(int)ds_const] != 0)
8218 error ("both %<const%> and %<constexpr%> cannot be used here");
8220 type_quals |= TYPE_QUAL_CONST;
8222 if (declspecs->specs[(int)ds_volatile])
8223 type_quals |= TYPE_QUAL_VOLATILE;
8224 if (declspecs->specs[(int)ds_restrict])
8225 type_quals |= TYPE_QUAL_RESTRICT;
8226 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8227 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8230 if (TREE_CODE (type) == FUNCTION_TYPE
8231 && type_quals != TYPE_UNQUALIFIED)
8233 /* This was an error in C++98 (cv-qualifiers cannot be added to
8234 a function type), but DR 295 makes the code well-formed by
8235 dropping the extra qualifiers. */
8236 if (pedantic && cxx_dialect == cxx98)
8238 tree bad_type = build_qualified_type (type, type_quals);
8239 pedwarn (input_location, OPT_pedantic,
8240 "ignoring %qV qualifiers added to function type %qT",
8243 type_quals = TYPE_UNQUALIFIED;
8245 type_quals |= cp_type_quals (type);
8246 type = cp_build_qualified_type_real
8247 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8248 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8249 /* We might have ignored or rejected some of the qualifiers. */
8250 type_quals = cp_type_quals (type);
8253 inlinep = !! declspecs->specs[(int)ds_inline];
8254 virtualp = !! declspecs->specs[(int)ds_virtual];
8255 explicitp = !! declspecs->specs[(int)ds_explicit];
8257 storage_class = declspecs->storage_class;
8258 if (storage_class == sc_static)
8259 staticp = 1 + (decl_context == FIELD);
8261 if (virtualp && staticp == 2)
8263 error ("member %qD cannot be declared both virtual and static", dname);
8264 storage_class = sc_none;
8267 friendp = !! declspecs->specs[(int)ds_friend];
8269 if (dependent_name && !friendp)
8271 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8272 return error_mark_node;
8275 /* Issue errors about use of storage classes for parameters. */
8276 if (decl_context == PARM)
8278 if (declspecs->specs[(int)ds_typedef])
8280 error ("typedef declaration invalid in parameter declaration");
8281 return error_mark_node;
8283 else if (template_parm_flag && storage_class != sc_none)
8285 error ("storage class specified for template parameter %qs", name);
8286 return error_mark_node;
8288 else if (storage_class == sc_static
8289 || storage_class == sc_extern
8291 error ("storage class specifiers invalid in parameter declarations");
8293 if (type_uses_auto (type))
8295 error ("parameter declared %<auto%>");
8296 type = error_mark_node;
8299 /* Function parameters cannot be constexpr. If we saw one, moan
8300 and pretend it wasn't there. */
8303 error ("a parameter cannot be declared %<constexpr%>");
8308 /* Give error if `virtual' is used outside of class declaration. */
8310 && (current_class_name == NULL_TREE || decl_context != FIELD))
8312 error ("%<virtual%> outside class declaration");
8316 /* Static anonymous unions are dealt with here. */
8317 if (staticp && decl_context == TYPENAME
8319 && ANON_AGGR_TYPE_P (declspecs->type))
8320 decl_context = FIELD;
8322 /* Warn about storage classes that are invalid for certain
8323 kinds of declarations (parameters, typenames, etc.). */
8326 && storage_class != sc_extern
8327 && storage_class != sc_static)
8328 || declspecs->specs[(int)ds_typedef]))
8330 error ("multiple storage classes in declaration of %qs", name);
8333 if (decl_context != NORMAL
8334 && ((storage_class != sc_none
8335 && storage_class != sc_mutable)
8338 if ((decl_context == PARM || decl_context == CATCHPARM)
8339 && (storage_class == sc_register
8340 || storage_class == sc_auto))
8342 else if (declspecs->specs[(int)ds_typedef])
8344 else if (decl_context == FIELD
8345 /* C++ allows static class elements. */
8346 && storage_class == sc_static)
8347 /* C++ also allows inlines and signed and unsigned elements,
8348 but in those cases we don't come in here. */
8352 if (decl_context == FIELD)
8353 error ("storage class specified for %qs", name);
8356 if (decl_context == PARM || decl_context == CATCHPARM)
8357 error ("storage class specified for parameter %qs", name);
8359 error ("storage class specified for typename");
8361 if (storage_class == sc_register
8362 || storage_class == sc_auto
8363 || storage_class == sc_extern
8365 storage_class = sc_none;
8368 else if (storage_class == sc_extern && funcdef_flag
8369 && ! toplevel_bindings_p ())
8370 error ("nested function %qs declared %<extern%>", name);
8371 else if (toplevel_bindings_p ())
8373 if (storage_class == sc_auto)
8374 error ("top-level declaration of %qs specifies %<auto%>", name);
8377 && storage_class != sc_extern
8378 && storage_class != sc_static)
8380 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8385 if (storage_class && friendp)
8387 error ("storage class specifiers invalid in friend function declarations");
8388 storage_class = sc_none;
8393 unqualified_id = NULL_TREE;
8396 unqualified_id = id_declarator->u.id.unqualified_name;
8397 switch (TREE_CODE (unqualified_id))
8400 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8401 if (TYPE_P (unqualified_id))
8402 unqualified_id = constructor_name (unqualified_id);
8405 case IDENTIFIER_NODE:
8406 case TEMPLATE_ID_EXPR:
8414 /* Determine the type of the entity declared by recurring on the
8416 for (; declarator; declarator = declarator->declarator)
8418 const cp_declarator *inner_declarator;
8421 if (type == error_mark_node)
8422 return error_mark_node;
8424 attrs = declarator->attributes;
8430 if (declarator == NULL || declarator->kind == cdk_id)
8431 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8432 if (declarator->kind == cdk_function)
8433 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8434 if (declarator->kind == cdk_array)
8435 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8436 returned_attrs = decl_attributes (&type,
8437 chainon (returned_attrs, attrs),
8441 if (declarator->kind == cdk_id)
8444 inner_declarator = declarator->declarator;
8446 switch (declarator->kind)
8449 type = create_array_type_for_decl (dname, type,
8450 declarator->u.array.bounds);
8458 /* Declaring a function type.
8459 Make sure we have a valid type for the function to return. */
8461 if (type_quals != TYPE_UNQUALIFIED)
8463 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8464 warning (OPT_Wignored_qualifiers,
8465 "type qualifiers ignored on function return type");
8466 /* We now know that the TYPE_QUALS don't apply to the
8467 decl, but to its return type. */
8468 type_quals = TYPE_UNQUALIFIED;
8470 errmsg = targetm.invalid_return_type (type);
8474 type = integer_type_node;
8477 /* Error about some types functions can't return. */
8479 if (TREE_CODE (type) == FUNCTION_TYPE)
8481 error ("%qs declared as function returning a function", name);
8482 return error_mark_node;
8484 if (TREE_CODE (type) == ARRAY_TYPE)
8486 error ("%qs declared as function returning an array", name);
8487 return error_mark_node;
8490 /* Pick up type qualifiers which should be applied to `this'. */
8491 memfn_quals = declarator->u.function.qualifiers;
8493 /* Pick up the exception specifications. */
8494 raises = declarator->u.function.exception_specification;
8496 /* Say it's a definition only for the CALL_EXPR
8497 closest to the identifier. */
8498 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8500 /* Handle a late-specified return type. */
8503 if (type_uses_auto (type))
8505 if (!declarator->u.function.late_return_type)
8507 error ("%qs function uses %<auto%> type specifier without"
8508 " late return type", name);
8509 return error_mark_node;
8511 else if (!is_auto (type))
8513 error ("%qs function with late return type has"
8514 " %qT as its type rather than plain %<auto%>",
8516 return error_mark_node;
8519 else if (declarator->u.function.late_return_type)
8521 error ("%qs function with late return type not declared"
8522 " with %<auto%> type specifier", name);
8523 return error_mark_node;
8526 type = splice_late_return_type
8527 (type, declarator->u.function.late_return_type);
8528 if (type == error_mark_node)
8529 return error_mark_node;
8531 if (ctype == NULL_TREE
8532 && decl_context == FIELD
8534 && (friendp == 0 || dname == current_class_name))
8535 ctype = current_class_type;
8537 if (ctype && (sfk == sfk_constructor
8538 || sfk == sfk_destructor))
8540 /* We are within a class's scope. If our declarator name
8541 is the same as the class name, and we are defining
8542 a function, then it is a constructor/destructor, and
8543 therefore returns a void type. */
8545 /* ISO C++ 12.4/2. A destructor may not be declared
8546 const or volatile. A destructor may not be
8549 ISO C++ 12.1. A constructor may not be declared
8550 const or volatile. A constructor may not be
8551 virtual. A constructor may not be static. */
8553 error ((flags == DTOR_FLAG)
8554 ? "destructor cannot be static member function"
8555 : "constructor cannot be static member function");
8558 error ((flags == DTOR_FLAG)
8559 ? "destructors may not be cv-qualified"
8560 : "constructors may not be cv-qualified");
8561 memfn_quals = TYPE_UNQUALIFIED;
8564 if (decl_context == FIELD
8565 && !member_function_or_else (ctype,
8568 return error_mark_node;
8570 if (flags != DTOR_FLAG)
8572 /* It's a constructor. */
8577 permerror (input_location, "constructors cannot be declared virtual");
8580 if (decl_context == FIELD
8581 && sfk != sfk_constructor)
8582 return error_mark_node;
8584 if (decl_context == FIELD)
8590 error ("can't initialize friend function %qs", name);
8593 /* Cannot be both friend and virtual. */
8594 error ("virtual functions cannot be friends");
8597 if (decl_context == NORMAL)
8598 error ("friend declaration not in class definition");
8599 if (current_function_decl && funcdef_flag)
8600 error ("can't define friend function %qs in a local "
8604 else if (ctype && sfk == sfk_conversion)
8608 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8613 /* It is not allowed to use `constexpr' in a function
8614 declaration that is not a definition.
8615 That is too strict, though. */
8616 if (constexpr_p && !funcdef_flag)
8618 error ("the %<constexpr%> specifier cannot be used in "
8619 "a function declaration that is not a definition");
8620 constexpr_p = false;
8623 /* A constexpr non-static member function is implicitly const. */
8624 if (constexpr_p && decl_context == FIELD && staticp == 0
8625 && sfk != sfk_constructor && sfk != sfk_destructor)
8626 memfn_quals |= TYPE_QUAL_CONST;
8628 arg_types = grokparms (declarator->u.function.parameters,
8631 if (inner_declarator
8632 && inner_declarator->kind == cdk_id
8633 && inner_declarator->u.id.sfk == sfk_destructor
8634 && arg_types != void_list_node)
8636 error ("destructors may not have parameters");
8637 arg_types = void_list_node;
8641 type = build_function_type (type, arg_types);
8648 /* Filter out pointers-to-references and references-to-references.
8649 We can get these if a TYPE_DECL is used. */
8651 if (TREE_CODE (type) == REFERENCE_TYPE)
8653 if (declarator->kind != cdk_reference)
8655 error ("cannot declare pointer to %q#T", type);
8656 type = TREE_TYPE (type);
8659 /* In C++0x, we allow reference to reference declarations
8660 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8661 and template type arguments [14.3.1/4 temp.arg.type]. The
8662 check for direct reference to reference declarations, which
8663 are still forbidden, occurs below. Reasoning behind the change
8664 can be found in DR106, DR540, and the rvalue reference
8666 else if (cxx_dialect == cxx98)
8668 error ("cannot declare reference to %q#T", type);
8669 type = TREE_TYPE (type);
8672 else if (VOID_TYPE_P (type))
8674 if (declarator->kind == cdk_reference)
8675 error ("cannot declare reference to %q#T", type);
8676 else if (declarator->kind == cdk_ptrmem)
8677 error ("cannot declare pointer to %q#T member", type);
8680 /* We now know that the TYPE_QUALS don't apply to the decl,
8681 but to the target of the pointer. */
8682 type_quals = TYPE_UNQUALIFIED;
8684 if (declarator->kind == cdk_ptrmem
8685 && (TREE_CODE (type) == FUNCTION_TYPE
8686 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8688 memfn_quals |= cp_type_quals (type);
8689 type = build_memfn_type (type,
8690 declarator->u.pointer.class_type,
8692 memfn_quals = TYPE_UNQUALIFIED;
8695 if (TREE_CODE (type) == FUNCTION_TYPE
8696 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8697 error (declarator->kind == cdk_reference
8698 ? G_("cannot declare reference to qualified function type %qT")
8699 : G_("cannot declare pointer to qualified function type %qT"),
8702 if (declarator->kind == cdk_reference)
8704 /* In C++0x, the type we are creating a reference to might be
8705 a typedef which is itself a reference type. In that case,
8706 we follow the reference collapsing rules in
8707 [7.1.3/8 dcl.typedef] to create the final reference type:
8709 "If a typedef TD names a type that is a reference to a type
8710 T, an attempt to create the type 'lvalue reference to cv TD'
8711 creates the type 'lvalue reference to T,' while an attempt
8712 to create the type "rvalue reference to cv TD' creates the
8715 if (!VOID_TYPE_P (type))
8716 type = cp_build_reference_type
8717 ((TREE_CODE (type) == REFERENCE_TYPE
8718 ? TREE_TYPE (type) : type),
8719 (declarator->u.reference.rvalue_ref
8720 && (TREE_CODE(type) != REFERENCE_TYPE
8721 || TYPE_REF_IS_RVALUE (type))));
8723 /* In C++0x, we need this check for direct reference to
8724 reference declarations, which are forbidden by
8725 [8.3.2/5 dcl.ref]. Reference to reference declarations
8726 are only allowed indirectly through typedefs and template
8727 type arguments. Example:
8729 void foo(int & &); // invalid ref-to-ref decl
8731 typedef int & int_ref;
8732 void foo(int_ref &); // valid ref-to-ref decl
8734 if (inner_declarator && inner_declarator->kind == cdk_reference)
8735 error ("cannot declare reference to %q#T, which is not "
8736 "a typedef or a template type argument", type);
8738 else if (TREE_CODE (type) == METHOD_TYPE)
8739 type = build_ptrmemfunc_type (build_pointer_type (type));
8740 else if (declarator->kind == cdk_ptrmem)
8742 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8744 if (declarator->u.pointer.class_type == error_mark_node)
8745 /* We will already have complained. */
8746 type = error_mark_node;
8748 type = build_ptrmem_type (declarator->u.pointer.class_type,
8752 type = build_pointer_type (type);
8754 /* Process a list of type modifier keywords (such as
8755 const or volatile) that were given inside the `*' or `&'. */
8757 if (declarator->u.pointer.qualifiers)
8760 = cp_build_qualified_type (type,
8761 declarator->u.pointer.qualifiers);
8762 type_quals = cp_type_quals (type);
8775 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8776 && TREE_CODE (type) != FUNCTION_TYPE
8777 && TREE_CODE (type) != METHOD_TYPE)
8779 error ("template-id %qD used as a declarator",
8781 unqualified_id = dname;
8784 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8785 qualified with a class-name, turn it into a METHOD_TYPE, unless
8786 we know that the function is static. We take advantage of this
8787 opportunity to do other processing that pertains to entities
8788 explicitly declared to be class members. Note that if DECLARATOR
8789 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8790 would not have exited the loop above. */
8792 && declarator->u.id.qualifying_scope
8793 && TYPE_P (declarator->u.id.qualifying_scope))
8797 ctype = declarator->u.id.qualifying_scope;
8798 ctype = TYPE_MAIN_VARIANT (ctype);
8800 while (t != NULL_TREE && CLASS_TYPE_P (t))
8802 /* You're supposed to have one `template <...>' for every
8803 template class, but you don't need one for a full
8804 specialization. For example:
8806 template <class T> struct S{};
8807 template <> struct S<int> { void f(); };
8808 void S<int>::f () {}
8810 is correct; there shouldn't be a `template <>' for the
8811 definition of `S<int>::f'. */
8812 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8813 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8814 /* T is an explicit (not partial) specialization. All
8815 containing classes must therefore also be explicitly
8818 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8819 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8820 template_count += 1;
8822 t = TYPE_MAIN_DECL (t);
8823 t = DECL_CONTEXT (t);
8826 if (ctype == current_class_type)
8830 permerror (input_location, "member functions are implicitly friends of their class");
8834 permerror (declarator->id_loc,
8835 "extra qualification %<%T::%> on member %qs",
8838 else if (/* If the qualifying type is already complete, then we
8839 can skip the following checks. */
8840 !COMPLETE_TYPE_P (ctype)
8841 && (/* If the function is being defined, then
8842 qualifying type must certainly be complete. */
8844 /* A friend declaration of "T::f" is OK, even if
8845 "T" is a template parameter. But, if this
8846 function is not a friend, the qualifying type
8848 || (!friendp && !CLASS_TYPE_P (ctype))
8849 /* For a declaration, the type need not be
8850 complete, if either it is dependent (since there
8851 is no meaningful definition of complete in that
8852 case) or the qualifying class is currently being
8854 || !(dependent_type_p (ctype)
8855 || currently_open_class (ctype)))
8856 /* Check that the qualifying type is complete. */
8857 && !complete_type_or_else (ctype, NULL_TREE))
8858 return error_mark_node;
8859 else if (TREE_CODE (type) == FUNCTION_TYPE)
8861 tree sname = declarator->u.id.unqualified_name;
8863 if (current_class_type
8864 && (!friendp || funcdef_flag))
8867 ? "cannot define member function %<%T::%s%> within %<%T%>"
8868 : "cannot declare member function %<%T::%s%> within %<%T%>",
8869 ctype, name, current_class_type);
8870 return error_mark_node;
8873 /* It is not permitted to define a member function outside ist
8874 membership class as `constexpr'. */
8876 error ("a constexpr function cannot be defined "
8877 "outside of its class");
8879 if (TREE_CODE (sname) == IDENTIFIER_NODE
8880 && NEW_DELETE_OPNAME_P (sname))
8881 /* Overloaded operator new and operator delete
8882 are always static functions. */
8885 type = build_memfn_type (type, ctype, memfn_quals);
8887 else if (declspecs->specs[(int)ds_typedef]
8888 && current_class_type)
8890 error ("cannot declare member %<%T::%s%> within %qT",
8891 ctype, name, current_class_type);
8892 return error_mark_node;
8896 /* Now TYPE has the actual type. */
8901 *attrlist = chainon (returned_attrs, *attrlist);
8903 attrlist = &returned_attrs;
8906 /* Handle parameter packs. */
8907 if (parameter_pack_p)
8909 if (decl_context == PARM)
8910 /* Turn the type into a pack expansion.*/
8911 type = make_pack_expansion (type);
8913 error ("non-parameter %qs cannot be a parameter pack", name);
8916 /* Did array size calculations overflow? */
8918 if (TREE_CODE (type) == ARRAY_TYPE
8919 && COMPLETE_TYPE_P (type)
8920 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8921 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8923 error ("size of array %qs is too large", name);
8924 /* If we proceed with the array type as it is, we'll eventually
8925 crash in tree_low_cst(). */
8926 type = error_mark_node;
8929 if ((decl_context == FIELD || decl_context == PARM)
8930 && !processing_template_decl
8931 && variably_modified_type_p (type, NULL_TREE))
8933 if (decl_context == FIELD)
8934 error ("data member may not have variably modified type %qT", type);
8936 error ("parameter may not have variably modified type %qT", type);
8937 type = error_mark_node;
8940 if (explicitp == 1 || (explicitp && friendp))
8942 /* [dcl.fct.spec] The explicit specifier shall only be used in
8943 declarations of constructors within a class definition. */
8944 error ("only declarations of constructors can be %<explicit%>");
8948 if (storage_class == sc_mutable)
8950 if (decl_context != FIELD || friendp)
8952 error ("non-member %qs cannot be declared %<mutable%>", name);
8953 storage_class = sc_none;
8955 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8957 error ("non-object member %qs cannot be declared %<mutable%>", name);
8958 storage_class = sc_none;
8960 else if (TREE_CODE (type) == FUNCTION_TYPE
8961 || TREE_CODE (type) == METHOD_TYPE)
8963 error ("function %qs cannot be declared %<mutable%>", name);
8964 storage_class = sc_none;
8968 error ("static %qs cannot be declared %<mutable%>", name);
8969 storage_class = sc_none;
8971 else if (type_quals & TYPE_QUAL_CONST)
8973 error ("const %qs cannot be declared %<mutable%>", name);
8974 storage_class = sc_none;
8978 /* If this is declaring a typedef name, return a TYPE_DECL. */
8979 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8983 /* Note that the grammar rejects storage classes
8984 in typenames, fields or parameters. */
8985 if (current_lang_name == lang_name_java)
8986 TYPE_FOR_JAVA (type) = 1;
8988 /* This declaration:
8990 typedef void f(int) const;
8992 declares a function type which is not a member of any
8993 particular class, but which is cv-qualified; for
8994 example "f S::*" declares a pointer to a const-qualified
8995 member function of S. We record the cv-qualification in the
8997 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8999 type = cp_build_qualified_type (type, memfn_quals);
9001 /* We have now dealt with these qualifiers. */
9002 memfn_quals = TYPE_UNQUALIFIED;
9005 if (decl_context == FIELD)
9006 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9008 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9009 if (id_declarator && declarator->u.id.qualifying_scope) {
9010 error_at (DECL_SOURCE_LOCATION (decl),
9011 "typedef name may not be a nested-name-specifier");
9012 TREE_TYPE (decl) = error_mark_node;
9015 if (decl_context != FIELD)
9017 if (!current_function_decl)
9018 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9019 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9020 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9021 (current_function_decl)))
9022 /* The TYPE_DECL is "abstract" because there will be
9023 clones of this constructor/destructor, and there will
9024 be copies of this TYPE_DECL generated in those
9026 DECL_ABSTRACT (decl) = 1;
9028 else if (constructor_name_p (unqualified_id, current_class_type))
9029 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9030 "as enclosing class",
9033 /* If the user declares "typedef struct {...} foo" then the
9034 struct will have an anonymous name. Fill that name in now.
9035 Nothing can refer to it, so nothing needs know about the name
9037 if (type != error_mark_node
9040 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9041 && TYPE_ANONYMOUS_P (type)
9042 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9046 /* Replace the anonymous name with the real name everywhere. */
9047 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9049 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9051 debug_hooks->set_name (t, decl);
9052 TYPE_NAME (t) = decl;
9056 if (TYPE_LANG_SPECIFIC (type))
9057 TYPE_WAS_ANONYMOUS (type) = 1;
9059 /* If this is a typedef within a template class, the nested
9060 type is a (non-primary) template. The name for the
9061 template needs updating as well. */
9062 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9063 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9064 = TYPE_IDENTIFIER (type);
9066 /* Adjust linkage now that we aren't anonymous anymore. */
9067 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9068 determine_visibility (TYPE_MAIN_DECL (type));
9070 /* FIXME remangle member functions; member functions of a
9071 type with external linkage have external linkage. */
9075 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9076 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9078 bad_specifiers (decl, "type", virtualp,
9079 memfn_quals != TYPE_UNQUALIFIED,
9080 inlinep, friendp, raises != NULL_TREE);
9085 /* Detect the case of an array type of unspecified size
9086 which came, as such, direct from a typedef name.
9087 We must copy the type, so that the array's domain can be
9088 individually set by the object's initializer. */
9090 if (type && typedef_type
9091 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9092 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9093 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9095 /* Detect where we're using a typedef of function type to declare a
9096 function. PARMS will not be set, so we must create it now. */
9098 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9100 tree decls = NULL_TREE;
9103 for (args = TYPE_ARG_TYPES (type);
9104 args && args != void_list_node;
9105 args = TREE_CHAIN (args))
9107 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9109 TREE_CHAIN (decl) = decls;
9113 parms = nreverse (decls);
9115 if (decl_context != TYPENAME)
9117 /* A cv-qualifier-seq shall only be part of the function type
9118 for a non-static member function. [8.3.5/4 dcl.fct] */
9119 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9120 && (current_class_type == NULL_TREE || staticp) )
9123 ? G_("qualified function types cannot be used to "
9124 "declare static member functions")
9125 : G_("qualified function types cannot be used to "
9126 "declare free functions"));
9127 type = TYPE_MAIN_VARIANT (type);
9130 /* The qualifiers on the function type become the qualifiers on
9131 the non-static member function. */
9132 memfn_quals |= cp_type_quals (type);
9133 type_quals = TYPE_UNQUALIFIED;
9137 /* If this is a type name (such as, in a cast or sizeof),
9138 compute the type and return it now. */
9140 if (decl_context == TYPENAME)
9142 /* Note that the grammar rejects storage classes
9143 in typenames, fields or parameters. */
9144 if (type_quals != TYPE_UNQUALIFIED)
9145 type_quals = TYPE_UNQUALIFIED;
9147 /* Special case: "friend class foo" looks like a TYPENAME context. */
9150 if (type_quals != TYPE_UNQUALIFIED)
9152 error ("type qualifiers specified for friend class declaration");
9153 type_quals = TYPE_UNQUALIFIED;
9157 error ("%<inline%> specified for friend class declaration");
9163 /* Don't allow friend declaration without a class-key. */
9164 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9165 permerror (input_location, "template parameters cannot be friends");
9166 else if (TREE_CODE (type) == TYPENAME_TYPE)
9167 permerror (input_location, "friend declaration requires class-key, "
9168 "i.e. %<friend class %T::%D%>",
9169 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9171 permerror (input_location, "friend declaration requires class-key, "
9172 "i.e. %<friend %#T%>",
9176 /* Only try to do this stuff if we didn't already give up. */
9177 if (type != integer_type_node)
9179 /* A friendly class? */
9180 if (current_class_type)
9181 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9184 error ("trying to make class %qT a friend of global scope",
9187 type = void_type_node;
9190 else if (memfn_quals)
9192 if (ctype == NULL_TREE
9193 && TREE_CODE (type) == METHOD_TYPE)
9194 ctype = TYPE_METHOD_BASETYPE (type);
9197 type = build_memfn_type (type, ctype, memfn_quals);
9198 /* Core issue #547: need to allow this in template type args. */
9199 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9200 type = cp_build_qualified_type (type, memfn_quals);
9202 error ("invalid qualifiers on non-member function type");
9207 else if (unqualified_id == NULL_TREE && decl_context != PARM
9208 && decl_context != CATCHPARM
9209 && TREE_CODE (type) != UNION_TYPE
9212 error ("abstract declarator %qT used as declaration", type);
9213 return error_mark_node;
9216 /* Only functions may be declared using an operator-function-id. */
9218 && IDENTIFIER_OPNAME_P (unqualified_id)
9219 && TREE_CODE (type) != FUNCTION_TYPE
9220 && TREE_CODE (type) != METHOD_TYPE)
9222 error ("declaration of %qD as non-function", unqualified_id);
9223 return error_mark_node;
9226 /* We don't check parameter types here because we can emit a better
9227 error message later. */
9228 if (decl_context != PARM)
9230 type = check_var_type (unqualified_id, type);
9231 if (type == error_mark_node)
9232 return error_mark_node;
9235 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9236 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9238 if (decl_context == PARM || decl_context == CATCHPARM)
9240 if (ctype || in_namespace)
9241 error ("cannot use %<::%> in parameter declaration");
9243 /* A parameter declared as an array of T is really a pointer to T.
9244 One declared as a function is really a pointer to a function.
9245 One declared as a member is really a pointer to member. */
9247 if (TREE_CODE (type) == ARRAY_TYPE)
9249 /* Transfer const-ness of array into that of type pointed to. */
9250 type = build_pointer_type (TREE_TYPE (type));
9251 type_quals = TYPE_UNQUALIFIED;
9253 else if (TREE_CODE (type) == FUNCTION_TYPE)
9254 type = build_pointer_type (type);
9260 if (decl_context == PARM)
9262 decl = cp_build_parm_decl (unqualified_id, type);
9264 bad_specifiers (decl, "parameter", virtualp,
9265 memfn_quals != TYPE_UNQUALIFIED,
9266 inlinep, friendp, raises != NULL_TREE);
9268 else if (decl_context == FIELD)
9270 /* The C99 flexible array extension. */
9271 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9272 && TYPE_DOMAIN (type) == NULL_TREE)
9274 tree itype = compute_array_index_type (dname, integer_zero_node);
9275 type = build_cplus_array_type (TREE_TYPE (type), itype);
9278 if (type == error_mark_node)
9280 /* Happens when declaring arrays of sizes which
9281 are error_mark_node, for example. */
9284 else if (in_namespace && !friendp)
9286 /* Something like struct S { int N::j; }; */
9287 error ("invalid use of %<::%>");
9288 return error_mark_node;
9290 else if (TREE_CODE (type) == FUNCTION_TYPE)
9293 tree function_context;
9297 if (ctype == NULL_TREE)
9298 ctype = current_class_type;
9300 if (ctype == NULL_TREE)
9302 error ("can't make %qD into a method -- not in a class",
9304 return error_mark_node;
9307 /* ``A union may [ ... ] not [ have ] virtual functions.''
9309 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9311 error ("function %qD declared virtual inside a union",
9313 return error_mark_node;
9316 if (NEW_DELETE_OPNAME_P (unqualified_id))
9320 error ("%qD cannot be declared virtual, since it "
9326 else if (staticp < 2)
9327 type = build_memfn_type (type, ctype, memfn_quals);
9330 /* Check that the name used for a destructor makes sense. */
9331 if (sfk == sfk_destructor)
9333 tree uqname = id_declarator->u.id.unqualified_name;
9337 gcc_assert (friendp);
9338 error ("expected qualified name in friend declaration "
9339 "for destructor %qD", uqname);
9340 return error_mark_node;
9343 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9345 error ("declaration of %qD as member of %qT",
9347 return error_mark_node;
9350 error ("a destructor cannot be %<constexpr%>");
9352 else if (sfk == sfk_constructor && friendp)
9354 error ("expected qualified name in friend declaration "
9355 "for constructor %qD",
9356 id_declarator->u.id.unqualified_name);
9357 return error_mark_node;
9360 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9361 function_context = (ctype != NULL_TREE) ?
9362 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9363 publicp = (! friendp || ! staticp)
9364 && function_context == NULL_TREE;
9365 decl = grokfndecl (ctype, type,
9366 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9367 ? unqualified_id : dname,
9370 virtualp, flags, memfn_quals, raises,
9371 friendp ? -1 : 0, friendp, publicp,
9372 inlinep || constexpr_p,
9374 funcdef_flag, template_count, in_namespace,
9375 attrlist, declarator->id_loc);
9376 if (decl == NULL_TREE)
9377 return error_mark_node;
9379 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9380 /* The decl and setting of decl_attr is also turned off. */
9381 decl = build_decl_attribute_variant (decl, decl_attr);
9384 /* [class.conv.ctor]
9386 A constructor declared without the function-specifier
9387 explicit that can be called with a single parameter
9388 specifies a conversion from the type of its first
9389 parameter to the type of its class. Such a constructor
9390 is called a converting constructor. */
9392 DECL_NONCONVERTING_P (decl) = 1;
9394 else if (TREE_CODE (type) == METHOD_TYPE)
9396 /* We only get here for friend declarations of
9397 members of other classes. */
9398 /* All method decls are public, so tell grokfndecl to set
9399 TREE_PUBLIC, also. */
9400 decl = grokfndecl (ctype, type,
9401 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9402 ? unqualified_id : dname,
9405 virtualp, flags, memfn_quals, raises,
9406 friendp ? -1 : 0, friendp, 1, 0, sfk,
9407 funcdef_flag, template_count, in_namespace,
9409 declarator->id_loc);
9410 if (decl == NULL_TREE)
9411 return error_mark_node;
9413 else if (!staticp && !dependent_type_p (type)
9414 && !COMPLETE_TYPE_P (complete_type (type))
9415 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9418 error ("field %qD has incomplete type", unqualified_id);
9420 error ("name %qT has incomplete type", type);
9422 /* If we're instantiating a template, tell them which
9423 instantiation made the field's type be incomplete. */
9424 if (current_class_type
9425 && TYPE_NAME (current_class_type)
9426 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9428 && declspecs->type == type)
9429 error (" in instantiation of template %qT",
9430 current_class_type);
9432 return error_mark_node;
9438 error ("%qE is neither function nor member function; "
9439 "cannot be declared friend", unqualified_id);
9447 /* Friends are treated specially. */
9448 if (ctype == current_class_type)
9449 ; /* We already issued a permerror. */
9450 else if (decl && DECL_NAME (decl))
9452 if (template_class_depth (current_class_type) == 0)
9454 decl = check_explicit_specialization
9455 (unqualified_id, decl, template_count,
9456 2 * funcdef_flag + 4);
9457 if (decl == error_mark_node)
9458 return error_mark_node;
9461 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9462 decl = do_friend (ctype, unqualified_id, decl,
9468 return error_mark_node;
9471 /* Structure field. It may not be a function, except for C++. */
9473 if (decl == NULL_TREE)
9479 /* An attempt is being made to initialize a non-static
9480 member. But, from [class.mem]:
9482 4 A member-declarator can contain a
9483 constant-initializer only if it declares a static
9484 member (_class.static_) of integral or enumeration
9485 type, see _class.static.data_.
9487 This used to be relatively common practice, but
9488 the rest of the compiler does not correctly
9489 handle the initialization unless the member is
9490 static so we make it static below. */
9491 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9493 permerror (input_location, "making %qD static", unqualified_id);
9497 if (uses_template_parms (type))
9498 /* We'll check at instantiation time. */
9500 else if (check_static_variable_definition (unqualified_id,
9502 /* If we just return the declaration, crashes
9503 will sometimes occur. We therefore return
9504 void_type_node, as if this was a friend
9505 declaration, to cause callers to completely
9506 ignore this declaration. */
9507 return error_mark_node;
9512 /* C++ allows static class members. All other work
9513 for this is done by grokfield. */
9514 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9515 set_linkage_for_static_data_member (decl);
9516 /* Even if there is an in-class initialization, DECL
9517 is considered undefined until an out-of-class
9518 definition is provided. */
9519 DECL_EXTERNAL (decl) = 1;
9522 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9527 error ("non-static data member %qE declared %<constexpr%>",
9529 decl = build_decl (input_location,
9530 FIELD_DECL, unqualified_id, type);
9531 DECL_NONADDRESSABLE_P (decl) = bitfield;
9532 if (bitfield && !unqualified_id)
9533 TREE_NO_WARNING (decl) = 1;
9535 if (storage_class == sc_mutable)
9537 DECL_MUTABLE_P (decl) = 1;
9538 storage_class = sc_none;
9542 bad_specifiers (decl, "field", virtualp,
9543 memfn_quals != TYPE_UNQUALIFIED,
9544 inlinep, friendp, raises != NULL_TREE);
9547 else if (TREE_CODE (type) == FUNCTION_TYPE
9548 || TREE_CODE (type) == METHOD_TYPE)
9553 if (!unqualified_id)
9554 return error_mark_node;
9556 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9557 original_name = dname;
9559 original_name = unqualified_id;
9561 if (storage_class == sc_auto)
9562 error ("storage class %<auto%> invalid for function %qs", name);
9563 else if (storage_class == sc_register)
9564 error ("storage class %<register%> invalid for function %qs", name);
9566 error ("storage class %<__thread%> invalid for function %qs", name);
9568 /* Function declaration not at top level.
9569 Storage classes other than `extern' are not allowed
9570 and `extern' makes no difference. */
9571 if (! toplevel_bindings_p ()
9572 && (storage_class == sc_static
9573 || declspecs->specs[(int)ds_inline])
9576 if (storage_class == sc_static)
9577 pedwarn (input_location, OPT_pedantic,
9578 "%<static%> specified invalid for function %qs "
9579 "declared out of global scope", name);
9581 pedwarn (input_location, OPT_pedantic,
9582 "%<inline%> specifier invalid for function %qs "
9583 "declared out of global scope", name);
9586 if (ctype != NULL_TREE
9587 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9589 error ("%q#T is not a class or a namespace", ctype);
9593 if (ctype == NULL_TREE)
9597 error ("virtual non-class function %qs", name);
9600 else if (sfk == sfk_constructor
9601 || sfk == sfk_destructor)
9604 ? "%qs defined in a non-class scope"
9605 : "%qs declared in a non-class scope", name);
9609 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9610 && !NEW_DELETE_OPNAME_P (original_name))
9611 type = build_method_type_directly (ctype,
9613 TYPE_ARG_TYPES (type));
9615 /* Record presence of `static'. */
9616 publicp = (ctype != NULL_TREE
9617 || storage_class == sc_extern
9618 || storage_class != sc_static);
9620 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9621 virtualp, flags, memfn_quals, raises,
9623 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9624 template_count, in_namespace, attrlist,
9625 declarator->id_loc);
9626 if (decl == NULL_TREE)
9627 return error_mark_node;
9631 int invalid_static = 0;
9633 /* Don't allow a static member function in a class, and forbid
9634 declaring main to be static. */
9635 if (TREE_CODE (type) == METHOD_TYPE)
9637 permerror (input_location, "cannot declare member function %qD to have "
9638 "static linkage", decl);
9641 else if (current_function_decl)
9643 /* FIXME need arm citation */
9644 error ("cannot declare static function inside another function");
9651 storage_class = sc_none;
9657 /* It's a variable. */
9659 /* An uninitialized decl with `extern' is a reference. */
9660 decl = grokvardecl (type, unqualified_id,
9663 (type_quals & TYPE_QUAL_CONST) != 0,
9664 ctype ? ctype : in_namespace);
9665 bad_specifiers (decl, "variable", virtualp,
9666 memfn_quals != TYPE_UNQUALIFIED,
9667 inlinep, friendp, raises != NULL_TREE);
9671 DECL_CONTEXT (decl) = ctype;
9674 permerror (input_location, "%<static%> may not be used when defining "
9675 "(as opposed to declaring) a static data member");
9677 storage_class = sc_none;
9679 if (storage_class == sc_register && TREE_STATIC (decl))
9681 error ("static member %qD declared %<register%>", decl);
9682 storage_class = sc_none;
9684 if (storage_class == sc_extern && pedantic)
9686 pedwarn (input_location, OPT_pedantic,
9687 "cannot explicitly declare member %q#D to have "
9688 "extern linkage", decl);
9689 storage_class = sc_none;
9694 if (storage_class == sc_extern && initialized && !funcdef_flag)
9696 if (toplevel_bindings_p ())
9698 /* It's common practice (and completely valid) to have a const
9699 be initialized and declared extern. */
9700 if (!(type_quals & TYPE_QUAL_CONST))
9701 warning (0, "%qs initialized and declared %<extern%>", name);
9705 error ("%qs has both %<extern%> and initializer", name);
9706 return error_mark_node;
9710 /* Record `register' declaration for warnings on &
9711 and in case doing stupid register allocation. */
9713 if (storage_class == sc_register)
9714 DECL_REGISTER (decl) = 1;
9715 else if (storage_class == sc_extern)
9716 DECL_THIS_EXTERN (decl) = 1;
9717 else if (storage_class == sc_static)
9718 DECL_THIS_STATIC (decl) = 1;
9720 /* Don't forget constexprness. */
9721 if (VAR_OR_FUNCTION_DECL_P (decl))
9722 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9724 /* Record constancy and volatility on the DECL itself . There's
9725 no need to do this when processing a template; we'll do this
9726 for the instantiated declaration based on the type of DECL. */
9727 if (!processing_template_decl)
9728 cp_apply_type_quals_to_decl (type_quals, decl);
9734 /* Subroutine of start_function. Ensure that each of the parameter
9735 types (as listed in PARMS) is complete, as is required for a
9736 function definition. */
9739 require_complete_types_for_parms (tree parms)
9741 for (; parms; parms = TREE_CHAIN (parms))
9743 if (dependent_type_p (TREE_TYPE (parms)))
9745 if (!VOID_TYPE_P (TREE_TYPE (parms))
9746 && complete_type_or_else (TREE_TYPE (parms), parms))
9748 relayout_decl (parms);
9749 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9752 /* grokparms or complete_type_or_else will have already issued
9754 TREE_TYPE (parms) = error_mark_node;
9758 /* Returns nonzero if T is a local variable. */
9761 local_variable_p (const_tree t)
9763 if ((TREE_CODE (t) == VAR_DECL
9764 /* A VAR_DECL with a context that is a _TYPE is a static data
9766 && !TYPE_P (CP_DECL_CONTEXT (t))
9767 /* Any other non-local variable must be at namespace scope. */
9768 && !DECL_NAMESPACE_SCOPE_P (t))
9769 || (TREE_CODE (t) == PARM_DECL))
9775 /* Like local_variable_p, but suitable for use as a tree-walking
9779 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9780 void *data ATTRIBUTE_UNUSED)
9782 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9784 else if (TYPE_P (*tp))
9791 /* Check that ARG, which is a default-argument expression for a
9792 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9793 something goes wrong. DECL may also be a _TYPE node, rather than a
9794 DECL, if there is no DECL available. */
9797 check_default_argument (tree decl, tree arg)
9802 if (TREE_CODE (arg) == DEFAULT_ARG)
9803 /* We get a DEFAULT_ARG when looking at an in-class declaration
9804 with a default argument. Ignore the argument for now; we'll
9805 deal with it after the class is complete. */
9814 decl_type = TREE_TYPE (decl);
9816 if (arg == error_mark_node
9817 || decl == error_mark_node
9818 || TREE_TYPE (arg) == error_mark_node
9819 || decl_type == error_mark_node)
9820 /* Something already went wrong. There's no need to check
9822 return error_mark_node;
9824 /* [dcl.fct.default]
9826 A default argument expression is implicitly converted to the
9828 if (!TREE_TYPE (arg)
9829 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9832 error ("default argument for %q#D has type %qT",
9833 decl, TREE_TYPE (arg));
9835 error ("default argument for parameter of type %qT has type %qT",
9836 decl_type, TREE_TYPE (arg));
9838 return error_mark_node;
9841 /* [dcl.fct.default]
9843 Local variables shall not be used in default argument
9846 The keyword `this' shall not be used in a default argument of a
9848 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9851 error ("default argument %qE uses local variable %qD", arg, var);
9852 return error_mark_node;
9859 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9862 type_is_deprecated (tree type)
9864 enum tree_code code;
9865 if (TREE_DEPRECATED (type))
9867 if (TYPE_NAME (type)
9868 && TREE_DEPRECATED (TYPE_NAME (type)))
9871 /* Do warn about using typedefs to a deprecated class. */
9872 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9873 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9875 code = TREE_CODE (type);
9877 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9878 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9879 || code == METHOD_TYPE || code == ARRAY_TYPE)
9880 return type_is_deprecated (TREE_TYPE (type));
9882 if (TYPE_PTRMEMFUNC_P (type))
9883 return type_is_deprecated
9884 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9889 /* Decode the list of parameter types for a function type.
9890 Given the list of things declared inside the parens,
9891 return a list of types.
9893 If this parameter does not end with an ellipsis, we append
9896 *PARMS is set to the chain of PARM_DECLs created. */
9899 grokparms (tree parmlist, tree *parms)
9901 tree result = NULL_TREE;
9902 tree decls = NULL_TREE;
9906 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9908 tree type = NULL_TREE;
9909 tree init = TREE_PURPOSE (parm);
9910 tree decl = TREE_VALUE (parm);
9913 if (parm == void_list_node)
9916 if (! decl || TREE_TYPE (decl) == error_mark_node)
9919 type = TREE_TYPE (decl);
9920 if (VOID_TYPE_P (type))
9922 if (same_type_p (type, void_type_node)
9923 && DECL_SELF_REFERENCE_P (type)
9924 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9925 /* this is a parmlist of `(void)', which is ok. */
9927 cxx_incomplete_type_error (decl, type);
9928 /* It's not a good idea to actually create parameters of
9929 type `void'; other parts of the compiler assume that a
9930 void type terminates the parameter list. */
9931 type = error_mark_node;
9932 TREE_TYPE (decl) = error_mark_node;
9935 if (type != error_mark_node
9936 && TYPE_FOR_JAVA (type)
9937 && MAYBE_CLASS_TYPE_P (type))
9939 error ("parameter %qD has Java class type", decl);
9940 type = error_mark_node;
9941 TREE_TYPE (decl) = error_mark_node;
9945 if (type != error_mark_node
9946 && (errmsg = targetm.invalid_parameter_type (type)))
9949 type = error_mark_node;
9950 TREE_TYPE (decl) = error_mark_node;
9953 if (type != error_mark_node)
9955 if (deprecated_state != DEPRECATED_SUPPRESS)
9957 tree deptype = type_is_deprecated (type);
9959 warn_deprecated_use (deptype, NULL_TREE);
9962 /* Top-level qualifiers on the parameters are
9963 ignored for function types. */
9964 type = cp_build_qualified_type (type, 0);
9965 if (TREE_CODE (type) == METHOD_TYPE)
9967 error ("parameter %qD invalidly declared method type", decl);
9968 type = build_pointer_type (type);
9969 TREE_TYPE (decl) = type;
9971 else if (abstract_virtuals_error (decl, type))
9972 any_error = 1; /* Seems like a good idea. */
9973 else if (POINTER_TYPE_P (type))
9975 /* [dcl.fct]/6, parameter types cannot contain pointers
9976 (references) to arrays of unknown bound. */
9977 tree t = TREE_TYPE (type);
9978 int ptr = TYPE_PTR_P (type);
9984 else if (TREE_CODE (t) != ARRAY_TYPE)
9986 else if (!TYPE_DOMAIN (t))
9990 if (TREE_CODE (t) == ARRAY_TYPE)
9992 ? G_("parameter %qD includes pointer to array of "
9993 "unknown bound %qT")
9994 : G_("parameter %qD includes reference to array of "
9995 "unknown bound %qT"),
10001 else if (init && !processing_template_decl)
10002 init = check_default_argument (decl, init);
10005 if (TREE_CODE (decl) == PARM_DECL
10006 && FUNCTION_PARAMETER_PACK_P (decl)
10007 && TREE_CHAIN (parm)
10008 && TREE_CHAIN (parm) != void_list_node)
10009 error ("parameter packs must be at the end of the parameter list");
10011 TREE_CHAIN (decl) = decls;
10013 result = tree_cons (init, type, result);
10015 decls = nreverse (decls);
10016 result = nreverse (result);
10018 result = chainon (result, void_list_node);
10025 /* D is a constructor or overloaded `operator='.
10027 Let T be the class in which D is declared. Then, this function
10030 -1 if D's is an ill-formed constructor or copy assignment operator
10031 whose first parameter is of type `T'.
10032 0 if D is not a copy constructor or copy assignment
10034 1 if D is a copy constructor or copy assignment operator whose
10035 first parameter is a reference to non-const qualified T.
10036 2 if D is a copy constructor or copy assignment operator whose
10037 first parameter is a reference to const qualified T.
10039 This function can be used as a predicate. Positive values indicate
10040 a copy constructor and nonzero values indicate a copy assignment
10044 copy_fn_p (const_tree d)
10050 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10052 if (TREE_CODE (d) == TEMPLATE_DECL
10053 || (DECL_TEMPLATE_INFO (d)
10054 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10055 /* Instantiations of template member functions are never copy
10056 functions. Note that member functions of templated classes are
10057 represented as template functions internally, and we must
10058 accept those as copy functions. */
10061 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10065 arg_type = TREE_VALUE (args);
10066 if (arg_type == error_mark_node)
10069 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10071 /* Pass by value copy assignment operator. */
10074 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10075 && !TYPE_REF_IS_RVALUE (arg_type)
10076 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10078 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10084 args = TREE_CHAIN (args);
10086 if (args && args != void_list_node && !TREE_PURPOSE (args))
10087 /* There are more non-optional args. */
10093 /* D is a constructor or overloaded `operator='.
10095 Let T be the class in which D is declared. Then, this function
10096 returns true when D is a move constructor or move assignment
10097 operator, false otherwise. */
10100 move_fn_p (const_tree d)
10104 bool result = false;
10106 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10108 if (cxx_dialect == cxx98)
10109 /* There are no move constructors if we are in C++98 mode. */
10112 if (TREE_CODE (d) == TEMPLATE_DECL
10113 || (DECL_TEMPLATE_INFO (d)
10114 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10115 /* Instantiations of template member functions are never copy
10116 functions. Note that member functions of templated classes are
10117 represented as template functions internally, and we must
10118 accept those as copy functions. */
10121 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10125 arg_type = TREE_VALUE (args);
10126 if (arg_type == error_mark_node)
10129 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10130 && TYPE_REF_IS_RVALUE (arg_type)
10131 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10135 args = TREE_CHAIN (args);
10137 if (args && args != void_list_node && !TREE_PURPOSE (args))
10138 /* There are more non-optional args. */
10144 /* Remember any special properties of member function DECL. */
10147 grok_special_member_properties (tree decl)
10151 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10154 class_type = DECL_CONTEXT (decl);
10155 if (DECL_CONSTRUCTOR_P (decl))
10157 int ctor = copy_fn_p (decl);
10159 if (!DECL_ARTIFICIAL (decl))
10160 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10166 A non-template constructor for class X is a copy
10167 constructor if its first parameter is of type X&, const
10168 X&, volatile X& or const volatile X&, and either there
10169 are no other parameters or else all other parameters have
10170 default arguments. */
10171 TYPE_HAS_INIT_REF (class_type) = 1;
10172 if (user_provided_p (decl))
10173 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10175 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10177 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10179 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10180 if (user_provided_p (decl))
10181 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10183 else if (is_list_ctor (decl))
10184 TYPE_HAS_LIST_CTOR (class_type) = 1;
10186 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10190 A non-template assignment operator for class X is a copy
10191 assignment operator if its parameter is of type X, X&, const
10192 X&, volatile X& or const volatile X&. */
10194 int assop = copy_fn_p (decl);
10198 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10199 if (user_provided_p (decl))
10200 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10202 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10207 /* Check a constructor DECL has the correct form. Complains
10208 if the class has a constructor of the form X(X). */
10211 grok_ctor_properties (const_tree ctype, const_tree decl)
10213 int ctor_parm = copy_fn_p (decl);
10219 A declaration of a constructor for a class X is ill-formed if
10220 its first parameter is of type (optionally cv-qualified) X
10221 and either there are no other parameters or else all other
10222 parameters have default arguments.
10224 We *don't* complain about member template instantiations that
10225 have this form, though; they can occur as we try to decide
10226 what constructor to use during overload resolution. Since
10227 overload resolution will never prefer such a constructor to
10228 the non-template copy constructor (which is either explicitly
10229 or implicitly defined), there's no need to worry about their
10230 existence. Theoretically, they should never even be
10231 instantiated, but that's hard to forestall. */
10232 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10240 /* An operator with this code is unary, but can also be binary. */
10243 ambi_op_p (enum tree_code code)
10245 return (code == INDIRECT_REF
10246 || code == ADDR_EXPR
10247 || code == UNARY_PLUS_EXPR
10248 || code == NEGATE_EXPR
10249 || code == PREINCREMENT_EXPR
10250 || code == PREDECREMENT_EXPR);
10253 /* An operator with this name can only be unary. */
10256 unary_op_p (enum tree_code code)
10258 return (code == TRUTH_NOT_EXPR
10259 || code == BIT_NOT_EXPR
10260 || code == COMPONENT_REF
10261 || code == TYPE_EXPR);
10264 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10265 errors are issued for invalid declarations. */
10268 grok_op_properties (tree decl, bool complain)
10270 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10272 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10273 tree name = DECL_NAME (decl);
10274 enum tree_code operator_code;
10279 /* Count the number of arguments and check for ellipsis. */
10280 for (argtype = argtypes, arity = 0;
10281 argtype && argtype != void_list_node;
10282 argtype = TREE_CHAIN (argtype))
10284 ellipsis_p = !argtype;
10286 class_type = DECL_CONTEXT (decl);
10287 if (class_type && !CLASS_TYPE_P (class_type))
10288 class_type = NULL_TREE;
10290 if (DECL_CONV_FN_P (decl))
10291 operator_code = TYPE_EXPR;
10295 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10296 if (ansi_opname (CODE) == name) \
10298 operator_code = (CODE); \
10301 else if (ansi_assopname (CODE) == name) \
10303 operator_code = (CODE); \
10304 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10308 #include "operators.def"
10309 #undef DEF_OPERATOR
10311 gcc_unreachable ();
10314 gcc_assert (operator_code != MAX_TREE_CODES);
10315 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10318 switch (operator_code)
10321 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10325 TYPE_GETS_DELETE (class_type) |= 1;
10329 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10332 case VEC_DELETE_EXPR:
10333 TYPE_GETS_DELETE (class_type) |= 2;
10340 /* [basic.std.dynamic.allocation]/1:
10342 A program is ill-formed if an allocation function is declared
10343 in a namespace scope other than global scope or declared static
10346 The same also holds true for deallocation functions. */
10347 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10348 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10350 if (DECL_NAMESPACE_SCOPE_P (decl))
10352 if (CP_DECL_CONTEXT (decl) != global_namespace)
10354 error ("%qD may not be declared within a namespace", decl);
10357 else if (!TREE_PUBLIC (decl))
10359 error ("%qD may not be declared as static", decl);
10365 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10367 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10368 DECL_IS_OPERATOR_NEW (decl) = 1;
10370 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10371 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10374 /* An operator function must either be a non-static member function
10375 or have at least one parameter of a class, a reference to a class,
10376 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10377 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10379 if (operator_code == TYPE_EXPR
10380 || operator_code == CALL_EXPR
10381 || operator_code == COMPONENT_REF
10382 || operator_code == ARRAY_REF
10383 || operator_code == NOP_EXPR)
10385 error ("%qD must be a nonstatic member function", decl);
10392 if (DECL_STATIC_FUNCTION_P (decl))
10394 error ("%qD must be either a non-static member "
10395 "function or a non-member function", decl);
10399 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10401 tree arg = non_reference (TREE_VALUE (p));
10402 if (arg == error_mark_node)
10405 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10406 because these checks are performed even on
10407 template functions. */
10408 if (MAYBE_CLASS_TYPE_P (arg)
10409 || TREE_CODE (arg) == ENUMERAL_TYPE)
10413 if (!p || p == void_list_node)
10416 error ("%qD must have an argument of class or "
10417 "enumerated type", decl);
10423 /* There are no restrictions on the arguments to an overloaded
10425 if (operator_code == CALL_EXPR)
10428 /* Warn about conversion operators that will never be used. */
10429 if (IDENTIFIER_TYPENAME_P (name)
10430 && ! DECL_TEMPLATE_INFO (decl)
10432 /* Warn only declaring the function; there is no need to
10433 warn again about out-of-class definitions. */
10434 && class_type == current_class_type)
10436 tree t = TREE_TYPE (name);
10437 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10440 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10442 if (TREE_CODE (t) == VOID_TYPE)
10443 warning (OPT_Wconversion,
10445 ? G_("conversion to a reference to void "
10446 "will never use a type conversion operator")
10447 : G_("conversion to void "
10448 "will never use a type conversion operator"));
10449 else if (class_type)
10451 if (t == class_type)
10452 warning (OPT_Wconversion,
10454 ? G_("conversion to a reference to the same type "
10455 "will never use a type conversion operator")
10456 : G_("conversion to the same type "
10457 "will never use a type conversion operator"));
10458 /* Don't force t to be complete here. */
10459 else if (MAYBE_CLASS_TYPE_P (t)
10460 && COMPLETE_TYPE_P (t)
10461 && DERIVED_FROM_P (t, class_type))
10462 warning (OPT_Wconversion,
10464 ? G_("conversion to a reference to a base class "
10465 "will never use a type conversion operator")
10466 : G_("conversion to a base class "
10467 "will never use a type conversion operator"));
10472 if (operator_code == COND_EXPR)
10475 error ("ISO C++ prohibits overloading operator ?:");
10478 else if (ellipsis_p)
10480 error ("%qD must not have variable number of arguments", decl);
10483 else if (ambi_op_p (operator_code))
10486 /* We pick the one-argument operator codes by default, so
10487 we don't have to change anything. */
10489 else if (arity == 2)
10491 /* If we thought this was a unary operator, we now know
10492 it to be a binary operator. */
10493 switch (operator_code)
10496 operator_code = MULT_EXPR;
10500 operator_code = BIT_AND_EXPR;
10503 case UNARY_PLUS_EXPR:
10504 operator_code = PLUS_EXPR;
10508 operator_code = MINUS_EXPR;
10511 case PREINCREMENT_EXPR:
10512 operator_code = POSTINCREMENT_EXPR;
10515 case PREDECREMENT_EXPR:
10516 operator_code = POSTDECREMENT_EXPR;
10520 gcc_unreachable ();
10523 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10525 if ((operator_code == POSTINCREMENT_EXPR
10526 || operator_code == POSTDECREMENT_EXPR)
10527 && ! processing_template_decl
10528 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10531 error ("postfix %qD must take %<int%> as its argument",
10534 error ("postfix %qD must take %<int%> as its second "
10542 error ("%qD must take either zero or one argument", decl);
10544 error ("%qD must take either one or two arguments", decl);
10548 /* More Effective C++ rule 6. */
10550 && (operator_code == POSTINCREMENT_EXPR
10551 || operator_code == POSTDECREMENT_EXPR
10552 || operator_code == PREINCREMENT_EXPR
10553 || operator_code == PREDECREMENT_EXPR))
10555 tree arg = TREE_VALUE (argtypes);
10556 tree ret = TREE_TYPE (TREE_TYPE (decl));
10557 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10558 arg = TREE_TYPE (arg);
10559 arg = TYPE_MAIN_VARIANT (arg);
10560 if (operator_code == PREINCREMENT_EXPR
10561 || operator_code == PREDECREMENT_EXPR)
10563 if (TREE_CODE (ret) != REFERENCE_TYPE
10564 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10566 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10567 build_reference_type (arg));
10571 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10572 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10576 else if (unary_op_p (operator_code))
10581 error ("%qD must take %<void%>", decl);
10583 error ("%qD must take exactly one argument", decl);
10587 else /* if (binary_op_p (operator_code)) */
10592 error ("%qD must take exactly one argument", decl);
10594 error ("%qD must take exactly two arguments", decl);
10598 /* More Effective C++ rule 7. */
10600 && (operator_code == TRUTH_ANDIF_EXPR
10601 || operator_code == TRUTH_ORIF_EXPR
10602 || operator_code == COMPOUND_EXPR))
10603 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10607 /* Effective C++ rule 23. */
10610 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10611 && (operator_code == PLUS_EXPR
10612 || operator_code == MINUS_EXPR
10613 || operator_code == TRUNC_DIV_EXPR
10614 || operator_code == MULT_EXPR
10615 || operator_code == TRUNC_MOD_EXPR)
10616 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10617 warning (OPT_Weffc__, "%qD should return by value", decl);
10619 /* [over.oper]/8 */
10620 for (; argtypes && argtypes != void_list_node;
10621 argtypes = TREE_CHAIN (argtypes))
10622 if (TREE_PURPOSE (argtypes))
10624 TREE_PURPOSE (argtypes) = NULL_TREE;
10625 if (operator_code == POSTINCREMENT_EXPR
10626 || operator_code == POSTDECREMENT_EXPR)
10628 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10633 error ("%qD cannot have default arguments", decl);
10641 /* Return a string giving the keyword associate with CODE. */
10643 static const char *
10644 tag_name (enum tag_types code)
10656 case typename_type:
10659 gcc_unreachable ();
10663 /* Name lookup in an elaborated-type-specifier (after the keyword
10664 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10665 elaborated-type-specifier is invalid, issue a diagnostic and return
10666 error_mark_node; otherwise, return the *_TYPE to which it referred.
10667 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10670 check_elaborated_type_specifier (enum tag_types tag_code,
10672 bool allow_template_p)
10678 struct S { struct S *p; };
10680 name lookup will find the TYPE_DECL for the implicit "S::S"
10681 typedef. Adjust for that here. */
10682 if (DECL_SELF_REFERENCE_P (decl))
10683 decl = TYPE_NAME (TREE_TYPE (decl));
10685 type = TREE_TYPE (decl);
10687 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10688 is false for this case as well. */
10689 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10691 error ("using template type parameter %qT after %qs",
10692 type, tag_name (tag_code));
10693 return error_mark_node;
10697 If the identifier resolves to a typedef-name or a template
10698 type-parameter, the elaborated-type-specifier is ill-formed.
10700 In other words, the only legitimate declaration to use in the
10701 elaborated type specifier is the implicit typedef created when
10702 the type is declared. */
10703 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10704 && !DECL_SELF_REFERENCE_P (decl)
10705 && tag_code != typename_type)
10707 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10708 error ("%q+D has a previous declaration here", decl);
10709 return error_mark_node;
10711 else if (TREE_CODE (type) != RECORD_TYPE
10712 && TREE_CODE (type) != UNION_TYPE
10713 && tag_code != enum_type
10714 && tag_code != typename_type)
10716 error ("%qT referred to as %qs", type, tag_name (tag_code));
10717 error ("%q+T has a previous declaration here", type);
10718 return error_mark_node;
10720 else if (TREE_CODE (type) != ENUMERAL_TYPE
10721 && tag_code == enum_type)
10723 error ("%qT referred to as enum", type);
10724 error ("%q+T has a previous declaration here", type);
10725 return error_mark_node;
10727 else if (!allow_template_p
10728 && TREE_CODE (type) == RECORD_TYPE
10729 && CLASSTYPE_IS_TEMPLATE (type))
10731 /* If a class template appears as elaborated type specifier
10732 without a template header such as:
10734 template <class T> class C {};
10735 void f(class C); // No template header here
10737 then the required template argument is missing. */
10738 error ("template argument required for %<%s %T%>",
10739 tag_name (tag_code),
10740 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10741 return error_mark_node;
10747 /* Lookup NAME in elaborate type specifier in scope according to
10748 SCOPE and issue diagnostics if necessary.
10749 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10750 found, and ERROR_MARK_NODE for type error. */
10753 lookup_and_check_tag (enum tag_types tag_code, tree name,
10754 tag_scope scope, bool template_header_p)
10758 if (scope == ts_global)
10760 /* First try ordinary name lookup, ignoring hidden class name
10761 injected via friend declaration. */
10762 decl = lookup_name_prefer_type (name, 2);
10763 /* If that fails, the name will be placed in the smallest
10764 non-class, non-function-prototype scope according to 3.3.1/5.
10765 We may already have a hidden name declared as friend in this
10766 scope. So lookup again but not ignoring hidden names.
10767 If we find one, that name will be made visible rather than
10768 creating a new tag. */
10770 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10773 decl = lookup_type_scope (name, scope);
10775 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10776 decl = DECL_TEMPLATE_RESULT (decl);
10778 if (decl && TREE_CODE (decl) == TYPE_DECL)
10780 /* Look for invalid nested type:
10784 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10786 error ("%qD has the same name as the class in which it is "
10789 return error_mark_node;
10792 /* Two cases we need to consider when deciding if a class
10793 template is allowed as an elaborated type specifier:
10794 1. It is a self reference to its own class.
10795 2. It comes with a template header.
10799 template <class T> class C {
10800 class C *c1; // DECL_SELF_REFERENCE_P is true
10803 template <class U> class C; // template_header_p is true
10804 template <class T> class C<T>::D {
10805 class C *c2; // DECL_SELF_REFERENCE_P is true
10808 t = check_elaborated_type_specifier (tag_code,
10811 | DECL_SELF_REFERENCE_P (decl));
10814 else if (decl && TREE_CODE (decl) == TREE_LIST)
10816 error ("reference to %qD is ambiguous", name);
10817 print_candidates (decl);
10818 return error_mark_node;
10824 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10825 Define the tag as a forward-reference if it is not defined.
10827 If a declaration is given, process it here, and report an error if
10828 multiple declarations are not identical.
10830 SCOPE is TS_CURRENT when this is also a definition. Only look in
10831 the current frame for the name (since C++ allows new names in any
10832 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10833 declaration. Only look beginning from the current scope outward up
10834 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10836 TEMPLATE_HEADER_P is true when this declaration is preceded by
10837 a set of template parameters. */
10840 xref_tag (enum tag_types tag_code, tree name,
10841 tag_scope scope, bool template_header_p)
10843 enum tree_code code;
10845 tree context = NULL_TREE;
10847 timevar_push (TV_NAME_LOOKUP);
10849 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10855 code = RECORD_TYPE;
10861 code = ENUMERAL_TYPE;
10864 gcc_unreachable ();
10867 /* In case of anonymous name, xref_tag is only called to
10868 make type node and push name. Name lookup is not required. */
10869 if (ANON_AGGRNAME_P (name))
10872 t = lookup_and_check_tag (tag_code, name,
10873 scope, template_header_p);
10875 if (t == error_mark_node)
10876 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10878 if (scope != ts_current && t && current_class_type
10879 && template_class_depth (current_class_type)
10880 && template_header_p)
10882 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10883 definition of this tag. Since, in addition, we are currently
10884 processing a (member) template declaration of a template
10885 class, we must be very careful; consider:
10892 { template <class V>
10893 friend struct S1; };
10895 Here, the S2::S1 declaration should not be confused with the
10896 outer declaration. In particular, the inner version should
10897 have a template parameter of level 2, not level 1. This
10898 would be particularly important if the member declaration
10901 template <class V = U> friend struct S1;
10903 say, when we should tsubst into `U' when instantiating
10904 S2. On the other hand, when presented with:
10914 we must find the inner binding eventually. We
10915 accomplish this by making sure that the new type we
10916 create to represent this declaration has the right
10918 context = TYPE_CONTEXT (t);
10924 /* If no such tag is yet defined, create a forward-reference node
10925 and record it as the "definition".
10926 When a real declaration of this type is found,
10927 the forward-reference will be altered into a real type. */
10928 if (code == ENUMERAL_TYPE)
10930 error ("use of enum %q#D without previous declaration", name);
10931 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10935 t = make_class_type (code);
10936 TYPE_CONTEXT (t) = context;
10937 t = pushtag (name, t, scope);
10942 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10944 if (!redeclare_class_template (t, current_template_parms))
10945 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10947 else if (!processing_template_decl
10948 && CLASS_TYPE_P (t)
10949 && CLASSTYPE_IS_TEMPLATE (t))
10951 error ("redeclaration of %qT as a non-template", t);
10952 error ("previous declaration %q+D", t);
10953 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10956 /* Make injected friend class visible. */
10957 if (scope != ts_within_enclosing_non_class
10958 && hidden_name_p (TYPE_NAME (t)))
10960 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10961 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10963 if (TYPE_TEMPLATE_INFO (t))
10965 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10966 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10971 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10975 xref_tag_from_type (tree old, tree id, tag_scope scope)
10977 enum tag_types tag_kind;
10979 if (TREE_CODE (old) == RECORD_TYPE)
10980 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10982 tag_kind = union_type;
10984 if (id == NULL_TREE)
10985 id = TYPE_IDENTIFIER (old);
10987 return xref_tag (tag_kind, id, scope, false);
10990 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10991 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10992 access_* node, and the TREE_VALUE is the type of the base-class.
10993 Non-NULL TREE_TYPE indicates virtual inheritance.
10995 Returns true if the binfo hierarchy was successfully created,
10996 false if an error was detected. */
10999 xref_basetypes (tree ref, tree base_list)
11002 tree binfo, base_binfo;
11003 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11004 unsigned max_bases = 0; /* Maximum direct bases. */
11006 tree default_access;
11007 tree igo_prev; /* Track Inheritance Graph Order. */
11009 if (ref == error_mark_node)
11012 /* The base of a derived class is private by default, all others are
11014 default_access = (TREE_CODE (ref) == RECORD_TYPE
11015 && CLASSTYPE_DECLARED_CLASS (ref)
11016 ? access_private_node : access_public_node);
11018 /* First, make sure that any templates in base-classes are
11019 instantiated. This ensures that if we call ourselves recursively
11020 we do not get confused about which classes are marked and which
11022 basep = &base_list;
11025 tree basetype = TREE_VALUE (*basep);
11027 if (!(processing_template_decl && uses_template_parms (basetype))
11028 && !complete_type_or_else (basetype, NULL))
11029 /* An incomplete type. Remove it from the list. */
11030 *basep = TREE_CHAIN (*basep);
11034 if (TREE_TYPE (*basep))
11036 if (CLASS_TYPE_P (basetype))
11037 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11038 basep = &TREE_CHAIN (*basep);
11042 TYPE_MARKED_P (ref) = 1;
11044 /* The binfo slot should be empty, unless this is an (ill-formed)
11046 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
11047 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11049 binfo = make_tree_binfo (max_bases);
11051 TYPE_BINFO (ref) = binfo;
11052 BINFO_OFFSET (binfo) = size_zero_node;
11053 BINFO_TYPE (binfo) = ref;
11055 /* Apply base-class info set up to the variants of this type. */
11056 fixup_type_variants (ref);
11060 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11061 /* An aggregate cannot have baseclasses. */
11062 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11064 if (TREE_CODE (ref) == UNION_TYPE)
11066 error ("derived union %qT invalid", ref);
11073 if (TYPE_FOR_JAVA (ref))
11075 error ("Java class %qT cannot have multiple bases", ref);
11082 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11084 if (TYPE_FOR_JAVA (ref))
11086 error ("Java class %qT cannot have virtual bases", ref);
11091 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11093 tree access = TREE_PURPOSE (base_list);
11094 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11095 tree basetype = TREE_VALUE (base_list);
11097 if (access == access_default_node)
11098 access = default_access;
11100 if (PACK_EXPANSION_P (basetype))
11101 basetype = PACK_EXPANSION_PATTERN (basetype);
11102 if (TREE_CODE (basetype) == TYPE_DECL)
11103 basetype = TREE_TYPE (basetype);
11104 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11106 error ("base type %qT fails to be a struct or class type",
11111 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11112 TYPE_FOR_JAVA (ref) = 1;
11114 base_binfo = NULL_TREE;
11115 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11117 base_binfo = TYPE_BINFO (basetype);
11118 /* The original basetype could have been a typedef'd type. */
11119 basetype = BINFO_TYPE (base_binfo);
11121 /* Inherit flags from the base. */
11122 TYPE_HAS_NEW_OPERATOR (ref)
11123 |= TYPE_HAS_NEW_OPERATOR (basetype);
11124 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11125 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11126 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11127 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11128 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11129 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11130 CLASSTYPE_REPEATED_BASE_P (ref)
11131 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11134 /* We must do this test after we've seen through a typedef
11136 if (TYPE_MARKED_P (basetype))
11138 if (basetype == ref)
11139 error ("recursive type %qT undefined", basetype);
11141 error ("duplicate base type %qT invalid", basetype);
11145 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11146 /* Regenerate the pack expansion for the bases. */
11147 basetype = make_pack_expansion (basetype);
11149 TYPE_MARKED_P (basetype) = 1;
11151 base_binfo = copy_binfo (base_binfo, basetype, ref,
11152 &igo_prev, via_virtual);
11153 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11154 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11156 BINFO_BASE_APPEND (binfo, base_binfo);
11157 BINFO_BASE_ACCESS_APPEND (binfo, access);
11160 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11161 /* If we have space in the vbase vector, we must have shared at
11162 least one of them, and are therefore diamond shaped. */
11163 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11165 /* Unmark all the types. */
11166 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11167 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11168 TYPE_MARKED_P (ref) = 0;
11170 /* Now see if we have a repeated base type. */
11171 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11173 for (base_binfo = binfo; base_binfo;
11174 base_binfo = TREE_CHAIN (base_binfo))
11176 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11178 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11181 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11183 for (base_binfo = binfo; base_binfo;
11184 base_binfo = TREE_CHAIN (base_binfo))
11185 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11186 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11195 /* Begin compiling the definition of an enumeration type.
11198 UNDERLYING_TYPE is the type that will be used as the storage for
11199 the enumeration type. This should be NULL_TREE if no storage type
11202 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11204 Returns the type object, as yet incomplete.
11205 Also records info about it so that build_enumerator
11206 may be used to declare the individual values as they are read. */
11209 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11213 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11215 /* If this is the real definition for a previous forward reference,
11216 fill in the contents in the same object that used to be the
11217 forward reference. */
11219 enumtype = lookup_and_check_tag (enum_type, name,
11220 /*tag_scope=*/ts_current,
11221 /*template_header_p=*/false);
11223 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11225 error_at (input_location, "multiple definition of %q#T", enumtype);
11226 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11227 "previous definition here");
11228 /* Clear out TYPE_VALUES, and start again. */
11229 TYPE_VALUES (enumtype) = NULL_TREE;
11233 /* In case of error, make a dummy enum to allow parsing to
11235 if (enumtype == error_mark_node)
11236 name = make_anon_name ();
11238 enumtype = cxx_make_type (ENUMERAL_TYPE);
11239 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11242 if (enumtype == error_mark_node)
11247 SET_SCOPED_ENUM_P (enumtype, 1);
11248 begin_scope (sk_scoped_enum, enumtype);
11250 /* [C++0x dcl.enum]p5:
11252 If not explicitly specified, the underlying type of a scoped
11253 enumeration type is int. */
11254 if (!underlying_type)
11255 underlying_type = integer_type_node;
11258 if (underlying_type)
11260 if (CP_INTEGRAL_TYPE_P (underlying_type))
11262 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11263 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11264 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11265 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11266 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11267 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11268 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11269 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11270 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11271 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11273 else if (!dependent_type_p (underlying_type))
11274 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11275 underlying_type, enumtype);
11281 /* After processing and defining all the values of an enumeration type,
11282 install their decls in the enumeration type and finish it off.
11283 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11286 finish_enum (tree enumtype)
11294 tree underlying_type = NULL_TREE;
11295 bool fixed_underlying_type_p
11296 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11298 /* We built up the VALUES in reverse order. */
11299 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11301 /* For an enum defined in a template, just set the type of the values;
11302 all further processing is postponed until the template is
11303 instantiated. We need to set the type so that tsubst of a CONST_DECL
11305 if (processing_template_decl)
11307 for (values = TYPE_VALUES (enumtype);
11309 values = TREE_CHAIN (values))
11310 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11311 if (at_function_scope_p ())
11312 add_stmt (build_min (TAG_DEFN, enumtype));
11313 if (SCOPED_ENUM_P (enumtype))
11318 /* Determine the minimum and maximum values of the enumerators. */
11319 if (TYPE_VALUES (enumtype))
11321 minnode = maxnode = NULL_TREE;
11323 for (values = TYPE_VALUES (enumtype);
11325 values = TREE_CHAIN (values))
11327 decl = TREE_VALUE (values);
11329 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11330 each enumerator has the type of its enumeration. Prior to the
11331 closing brace, the type of each enumerator is the type of its
11332 initializing value. */
11333 TREE_TYPE (decl) = enumtype;
11335 /* Update the minimum and maximum values, if appropriate. */
11336 value = DECL_INITIAL (decl);
11337 if (value == error_mark_node)
11338 value = integer_zero_node;
11339 /* Figure out what the minimum and maximum values of the
11340 enumerators are. */
11342 minnode = maxnode = value;
11343 else if (tree_int_cst_lt (maxnode, value))
11345 else if (tree_int_cst_lt (value, minnode))
11352 If the enumerator-list is empty, the underlying type is as if
11353 the enumeration had a single enumerator with value 0. */
11354 minnode = maxnode = integer_zero_node;
11356 if (!fixed_underlying_type_p)
11358 /* Compute the number of bits require to represent all values of the
11359 enumeration. We must do this before the type of MINNODE and
11360 MAXNODE are transformed, since tree_int_cst_min_precision relies
11361 on the TREE_TYPE of the value it is passed. */
11362 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11363 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11364 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11365 int precision = MAX (lowprec, highprec);
11367 bool use_short_enum;
11369 /* Determine the underlying type of the enumeration.
11373 The underlying type of an enumeration is an integral type that
11374 can represent all the enumerator values defined in the
11375 enumeration. It is implementation-defined which integral type is
11376 used as the underlying type for an enumeration except that the
11377 underlying type shall not be larger than int unless the value of
11378 an enumerator cannot fit in an int or unsigned int.
11380 We use "int" or an "unsigned int" as the underlying type, even if
11381 a smaller integral type would work, unless the user has
11382 explicitly requested that we use the smallest possible type. The
11383 user can request that for all enumerations with a command line
11384 flag, or for just one enumeration with an attribute. */
11386 use_short_enum = flag_short_enums
11387 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11389 for (itk = (use_short_enum ? itk_char : itk_int);
11393 underlying_type = integer_types[itk];
11394 if (TYPE_PRECISION (underlying_type) >= precision
11395 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11398 if (itk == itk_none)
11402 IF no integral type can represent all the enumerator values, the
11403 enumeration is ill-formed. */
11404 error ("no integral type can represent all of the enumerator values "
11405 "for %qT", enumtype);
11406 precision = TYPE_PRECISION (long_long_integer_type_node);
11407 underlying_type = integer_types[itk_unsigned_long_long];
11412 The value of sizeof() applied to an enumeration type, an object
11413 of an enumeration type, or an enumerator, is the value of sizeof()
11414 applied to the underlying type. */
11415 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11416 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11417 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11418 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11419 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11420 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11421 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11422 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11423 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11425 /* Compute the minimum and maximum values for the type.
11429 For an enumeration where emin is the smallest enumerator and emax
11430 is the largest, the values of the enumeration are the values of the
11431 underlying type in the range bmin to bmax, where bmin and bmax are,
11432 respectively, the smallest and largest values of the smallest bit-
11433 field that can store emin and emax. */
11435 /* The middle-end currently assumes that types with TYPE_PRECISION
11436 narrower than their underlying type are suitably zero or sign
11437 extended to fill their mode. Similarly, it assumes that the front
11438 end assures that a value of a particular type must be within
11439 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11441 We used to set these fields based on bmin and bmax, but that led
11442 to invalid assumptions like optimizing away bounds checking. So
11443 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11444 TYPE_MAX_VALUE to the values for the mode above and only restrict
11445 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11446 ENUM_UNDERLYING_TYPE (enumtype)
11447 = build_distinct_type_copy (underlying_type);
11448 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11449 set_min_and_max_values_for_integral_type
11450 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11452 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11453 if (flag_strict_enums)
11454 set_min_and_max_values_for_integral_type (enumtype, precision,
11458 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11460 /* Convert each of the enumerators to the type of the underlying
11461 type of the enumeration. */
11462 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11464 location_t saved_location;
11466 decl = TREE_VALUE (values);
11467 saved_location = input_location;
11468 input_location = DECL_SOURCE_LOCATION (decl);
11469 if (fixed_underlying_type_p)
11470 /* If the enumeration type has a fixed underlying type, we
11471 already checked all of the enumerator values. */
11472 value = DECL_INITIAL (decl);
11474 value = perform_implicit_conversion (underlying_type,
11475 DECL_INITIAL (decl),
11476 tf_warning_or_error);
11477 input_location = saved_location;
11479 /* Do not clobber shared ints. */
11480 value = copy_node (value);
11482 TREE_TYPE (value) = enumtype;
11483 DECL_INITIAL (decl) = value;
11486 /* Fix up all variant types of this enum type. */
11487 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11489 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11490 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11491 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11492 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11493 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11494 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11495 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11496 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11497 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11498 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11499 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11502 /* Finish up the scope of a scoped enumeration. */
11503 if (SCOPED_ENUM_P (enumtype))
11506 /* Finish debugging output for this type. */
11507 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11510 /* Build and install a CONST_DECL for an enumeration constant of the
11511 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11512 Assignment of sequential values by default is handled here. */
11515 build_enumerator (tree name, tree value, tree enumtype)
11521 /* If the VALUE was erroneous, pretend it wasn't there; that will
11522 result in the enum being assigned the next value in sequence. */
11523 if (value == error_mark_node)
11526 /* Remove no-op casts from the value. */
11528 STRIP_TYPE_NOPS (value);
11530 if (! processing_template_decl)
11532 /* Validate and default VALUE. */
11533 if (value != NULL_TREE)
11535 value = integral_constant_value (value);
11537 if (TREE_CODE (value) == INTEGER_CST)
11539 value = perform_integral_promotions (value);
11540 constant_expression_warning (value);
11544 error ("enumerator value for %qD is not an integer constant", name);
11549 /* Default based on previous value. */
11550 if (value == NULL_TREE)
11552 if (TYPE_VALUES (enumtype))
11555 unsigned HOST_WIDE_INT lo;
11559 /* The next value is the previous value plus one.
11560 add_double doesn't know the type of the target expression,
11561 so we must check with int_fits_type_p as well. */
11562 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11563 if (error_operand_p (prev_value))
11564 value = error_mark_node;
11567 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11568 TREE_INT_CST_HIGH (prev_value),
11570 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11572 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11576 error ("overflow in enumeration values at %qD", name);
11577 value = error_mark_node;
11582 value = integer_zero_node;
11585 /* Remove no-op casts from the value. */
11586 STRIP_TYPE_NOPS (value);
11588 /* If the underlying type of the enum is fixed, check whether
11589 the enumerator values fits in the underlying type. If it
11590 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11591 if (ENUM_UNDERLYING_TYPE (enumtype)
11593 && TREE_CODE (value) == INTEGER_CST
11594 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11596 error ("enumerator value %E is too large for underlying type %<%T%>",
11597 value, ENUM_UNDERLYING_TYPE (enumtype));
11599 /* Silently convert the value so that we can continue. */
11600 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11605 /* C++ associates enums with global, function, or class declarations. */
11606 context = current_scope ();
11608 /* Build the actual enumeration constant. Note that the enumeration
11609 constants have the underlying type of the enum (if it is fixed)
11610 or the type of their initializer (if the underlying type of the
11611 enum is not fixed):
11615 If the underlying type is fixed, the type of each enumerator
11616 prior to the closing brace is the underlying type; if the
11617 initializing value of an enumerator cannot be represented by
11618 the underlying type, the program is ill-formed. If the
11619 underlying type is not fixed, the type of each enumerator is
11620 the type of its initializing value.
11622 If the underlying type is not fixed, it will be computed by
11623 finish_enum and we will reset the type of this enumerator. Of
11624 course, if we're processing a template, there may be no value. */
11625 type = value ? TREE_TYPE (value) : NULL_TREE;
11627 if (context && context == current_class_type)
11628 /* This enum declaration is local to the class. We need the full
11629 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11630 decl = build_lang_decl (CONST_DECL, name, type);
11632 /* It's a global enum, or it's local to a function. (Note local to
11633 a function could mean local to a class method. */
11634 decl = build_decl (input_location, CONST_DECL, name, type);
11636 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11637 TREE_CONSTANT (decl) = 1;
11638 TREE_READONLY (decl) = 1;
11639 DECL_INITIAL (decl) = value;
11641 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11642 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11643 on the TYPE_FIELDS list for `S'. (That's so that you can say
11644 things like `S::i' later.) */
11645 finish_member_declaration (decl);
11649 /* Add this enumeration constant to the list for this type. */
11650 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11653 /* Look for an enumerator with the given NAME within the enumeration
11654 type ENUMTYPE. This routine is used primarily for qualified name
11655 lookup into an enumerator in C++0x, e.g.,
11657 enum class Color { Red, Green, Blue };
11659 Color color = Color::Red;
11661 Returns the value corresponding to the enumerator, or
11662 NULL_TREE if no such enumerator was found. */
11664 lookup_enumerator (tree enumtype, tree name)
11667 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11669 e = purpose_member (name, TYPE_VALUES (enumtype));
11670 return e? TREE_VALUE (e) : NULL_TREE;
11674 /* We're defining DECL. Make sure that its type is OK. */
11677 check_function_type (tree decl, tree current_function_parms)
11679 tree fntype = TREE_TYPE (decl);
11680 tree return_type = complete_type (TREE_TYPE (fntype));
11682 /* In a function definition, arg types must be complete. */
11683 require_complete_types_for_parms (current_function_parms);
11685 /* constexpr functions must have literal argument types and
11686 literal return type. */
11687 validate_constexpr_fundecl (decl);
11689 if (dependent_type_p (return_type))
11691 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11692 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11694 tree args = TYPE_ARG_TYPES (fntype);
11696 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11697 error ("return type %q#T is incomplete", return_type);
11699 error ("return type has Java class type %q#T", return_type);
11701 /* Make it return void instead. */
11702 if (TREE_CODE (fntype) == METHOD_TYPE)
11703 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11705 TREE_CHAIN (args));
11707 fntype = build_function_type (void_type_node, args);
11709 = build_exception_variant (fntype,
11710 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11711 fntype = (cp_build_type_attribute_variant
11712 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11713 TREE_TYPE (decl) = fntype;
11716 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11719 /* Create the FUNCTION_DECL for a function definition.
11720 DECLSPECS and DECLARATOR are the parts of the declaration;
11721 they describe the function's name and the type it returns,
11722 but twisted together in a fashion that parallels the syntax of C.
11724 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11725 DECLARATOR is really the DECL for the function we are about to
11726 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11727 indicating that the function is an inline defined in-class.
11729 This function creates a binding context for the function body
11730 as well as setting up the FUNCTION_DECL in current_function_decl.
11732 For C++, we must first check whether that datum makes any sense.
11733 For example, "class A local_a(1,2);" means that variable local_a
11734 is an aggregate of type A, which should have a constructor
11735 applied to it with the argument list [1, 2].
11737 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11738 or may be a BLOCK if the function has been defined previously
11739 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11740 error_mark_node if the function has never been defined, or
11741 a BLOCK if the function has been defined somewhere. */
11744 start_preparsed_function (tree decl1, tree attrs, int flags)
11746 tree ctype = NULL_TREE;
11749 int doing_friend = 0;
11750 struct cp_binding_level *bl;
11751 tree current_function_parms;
11752 struct c_fileinfo *finfo
11753 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11754 bool honor_interface;
11756 /* Sanity check. */
11757 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11758 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11760 fntype = TREE_TYPE (decl1);
11761 if (TREE_CODE (fntype) == METHOD_TYPE)
11762 ctype = TYPE_METHOD_BASETYPE (fntype);
11764 /* ISO C++ 11.4/5. A friend function defined in a class is in
11765 the (lexical) scope of the class in which it is defined. */
11766 if (!ctype && DECL_FRIEND_P (decl1))
11768 ctype = DECL_FRIEND_CONTEXT (decl1);
11770 /* CTYPE could be null here if we're dealing with a template;
11771 for example, `inline friend float foo()' inside a template
11772 will have no CTYPE set. */
11773 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11779 if (DECL_DECLARED_INLINE_P (decl1)
11780 && lookup_attribute ("noinline", attrs))
11781 warning (0, "inline function %q+D given attribute noinline", decl1);
11783 /* Handle gnu_inline attribute. */
11784 if (GNU_INLINE_P (decl1))
11786 DECL_EXTERNAL (decl1) = 1;
11787 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11788 DECL_INTERFACE_KNOWN (decl1) = 1;
11789 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11792 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11793 /* This is a constructor, we must ensure that any default args
11794 introduced by this definition are propagated to the clones
11795 now. The clones are used directly in overload resolution. */
11796 adjust_clone_args (decl1);
11798 /* Sometimes we don't notice that a function is a static member, and
11799 build a METHOD_TYPE for it. Fix that up now. */
11800 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11801 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11803 revert_static_member_fn (decl1);
11807 /* Set up current_class_type, and enter the scope of the class, if
11810 push_nested_class (ctype);
11811 else if (DECL_STATIC_FUNCTION_P (decl1))
11812 push_nested_class (DECL_CONTEXT (decl1));
11814 /* Now that we have entered the scope of the class, we must restore
11815 the bindings for any template parameters surrounding DECL1, if it
11816 is an inline member template. (Order is important; consider the
11817 case where a template parameter has the same name as a field of
11818 the class.) It is not until after this point that
11819 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11820 if (flags & SF_INCLASS_INLINE)
11821 maybe_begin_member_template_processing (decl1);
11823 /* Effective C++ rule 15. */
11825 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11826 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11827 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11829 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11830 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11831 if (!DECL_INITIAL (decl1))
11832 DECL_INITIAL (decl1) = error_mark_node;
11834 /* This function exists in static storage.
11835 (This does not mean `static' in the C sense!) */
11836 TREE_STATIC (decl1) = 1;
11838 /* We must call push_template_decl after current_class_type is set
11839 up. (If we are processing inline definitions after exiting a
11840 class scope, current_class_type will be NULL_TREE until set above
11841 by push_nested_class.) */
11842 if (processing_template_decl)
11844 /* FIXME: Handle error_mark_node more gracefully. */
11845 tree newdecl1 = push_template_decl (decl1);
11846 if (newdecl1 != error_mark_node)
11850 /* We are now in the scope of the function being defined. */
11851 current_function_decl = decl1;
11853 /* Save the parm names or decls from this function's declarator
11854 where store_parm_decls will find them. */
11855 current_function_parms = DECL_ARGUMENTS (decl1);
11857 /* Make sure the parameter and return types are reasonable. When
11858 you declare a function, these types can be incomplete, but they
11859 must be complete when you define the function. */
11860 check_function_type (decl1, current_function_parms);
11862 /* Build the return declaration for the function. */
11863 restype = TREE_TYPE (fntype);
11864 if (DECL_RESULT (decl1) == NULL_TREE)
11868 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11869 DECL_ARTIFICIAL (resdecl) = 1;
11870 DECL_IGNORED_P (resdecl) = 1;
11871 DECL_RESULT (decl1) = resdecl;
11873 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11876 /* Let the user know we're compiling this function. */
11877 announce_function (decl1);
11879 /* Record the decl so that the function name is defined.
11880 If we already have a decl for this name, and it is a FUNCTION_DECL,
11881 use the old decl. */
11882 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11884 /* A specialization is not used to guide overload resolution. */
11885 if (!DECL_FUNCTION_MEMBER_P (decl1)
11886 && !(DECL_USE_TEMPLATE (decl1) &&
11887 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11889 tree olddecl = pushdecl (decl1);
11891 if (olddecl == error_mark_node)
11892 /* If something went wrong when registering the declaration,
11893 use DECL1; we have to have a FUNCTION_DECL to use when
11894 parsing the body of the function. */
11898 /* Otherwise, OLDDECL is either a previous declaration
11899 of the same function or DECL1 itself. */
11901 if (warn_missing_declarations
11902 && olddecl == decl1
11903 && !DECL_MAIN_P (decl1)
11904 && TREE_PUBLIC (decl1)
11905 && !DECL_DECLARED_INLINE_P (decl1))
11909 /* Check whether DECL1 is in an anonymous
11911 for (context = DECL_CONTEXT (decl1);
11913 context = DECL_CONTEXT (context))
11915 if (TREE_CODE (context) == NAMESPACE_DECL
11916 && DECL_NAME (context) == NULL_TREE)
11920 if (context == NULL)
11921 warning (OPT_Wmissing_declarations,
11922 "no previous declaration for %q+D", decl1);
11930 /* We need to set the DECL_CONTEXT. */
11931 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11932 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11934 fntype = TREE_TYPE (decl1);
11936 /* If #pragma weak applies, mark the decl appropriately now.
11937 The pragma only applies to global functions. Because
11938 determining whether or not the #pragma applies involves
11939 computing the mangled name for the declaration, we cannot
11940 apply the pragma until after we have merged this declaration
11941 with any previous declarations; if the original declaration
11942 has a linkage specification, that specification applies to
11943 the definition as well, and may affect the mangled name. */
11944 if (!DECL_CONTEXT (decl1))
11945 maybe_apply_pragma_weak (decl1);
11948 /* Reset this in case the call to pushdecl changed it. */
11949 current_function_decl = decl1;
11951 gcc_assert (DECL_INITIAL (decl1));
11953 /* This function may already have been parsed, in which case just
11954 return; our caller will skip over the body without parsing. */
11955 if (DECL_INITIAL (decl1) != error_mark_node)
11958 /* Initialize RTL machinery. We cannot do this until
11959 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11960 even when processing a template; this is how we get
11961 CFUN set up, and our per-function variables initialized.
11962 FIXME factor out the non-RTL stuff. */
11963 bl = current_binding_level;
11964 allocate_struct_function (decl1, processing_template_decl);
11966 /* Initialize the language data structures. Whenever we start
11967 a new function, we destroy temporaries in the usual way. */
11968 cfun->language = GGC_CNEW (struct language_function);
11969 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11970 current_binding_level = bl;
11972 /* Even though we're inside a function body, we still don't want to
11973 call expand_expr to calculate the size of a variable-sized array.
11974 We haven't necessarily assigned RTL to all variables yet, so it's
11975 not safe to try to expand expressions involving them. */
11976 cfun->dont_save_pending_sizes_p = 1;
11978 /* Start the statement-tree, start the tree now. */
11979 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11981 /* If we are (erroneously) defining a function that we have already
11982 defined before, wipe out what we knew before. */
11983 if (!DECL_PENDING_INLINE_P (decl1))
11984 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11986 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11988 /* We know that this was set up by `grokclassfn'. We do not
11989 wait until `store_parm_decls', since evil parse errors may
11990 never get us to that point. Here we keep the consistency
11991 between `current_class_type' and `current_class_ptr'. */
11992 tree t = DECL_ARGUMENTS (decl1);
11994 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11995 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11997 cp_function_chain->x_current_class_ref
11998 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
11999 cp_function_chain->x_current_class_ptr = t;
12001 /* Constructors and destructors need to know whether they're "in
12002 charge" of initializing virtual base classes. */
12003 t = TREE_CHAIN (t);
12004 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12006 current_in_charge_parm = t;
12007 t = TREE_CHAIN (t);
12009 if (DECL_HAS_VTT_PARM_P (decl1))
12011 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12012 current_vtt_parm = t;
12016 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12017 /* Implicitly-defined methods (like the
12018 destructor for a class in which no destructor
12019 is explicitly declared) must not be defined
12020 until their definition is needed. So, we
12021 ignore interface specifications for
12022 compiler-generated functions. */
12023 && !DECL_ARTIFICIAL (decl1));
12025 if (DECL_INTERFACE_KNOWN (decl1))
12027 tree ctx = decl_function_context (decl1);
12029 if (DECL_NOT_REALLY_EXTERN (decl1))
12030 DECL_EXTERNAL (decl1) = 0;
12032 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12033 && TREE_PUBLIC (ctx))
12034 /* This is a function in a local class in an extern inline
12036 comdat_linkage (decl1);
12038 /* If this function belongs to an interface, it is public.
12039 If it belongs to someone else's interface, it is also external.
12040 This only affects inlines and template instantiations. */
12041 else if (!finfo->interface_unknown && honor_interface)
12043 if (DECL_DECLARED_INLINE_P (decl1)
12044 || DECL_TEMPLATE_INSTANTIATION (decl1)
12045 || processing_template_decl)
12047 DECL_EXTERNAL (decl1)
12048 = (finfo->interface_only
12049 || (DECL_DECLARED_INLINE_P (decl1)
12050 && ! flag_implement_inlines
12051 && !DECL_VINDEX (decl1)));
12053 /* For WIN32 we also want to put these in linkonce sections. */
12054 maybe_make_one_only (decl1);
12057 DECL_EXTERNAL (decl1) = 0;
12058 DECL_INTERFACE_KNOWN (decl1) = 1;
12059 /* If this function is in an interface implemented in this file,
12060 make sure that the back end knows to emit this function
12062 if (!DECL_EXTERNAL (decl1))
12063 mark_needed (decl1);
12065 else if (finfo->interface_unknown && finfo->interface_only
12066 && honor_interface)
12068 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12069 interface, we will have both finfo->interface_unknown and
12070 finfo->interface_only set. In that case, we don't want to
12071 use the normal heuristics because someone will supply a
12072 #pragma implementation elsewhere, and deducing it here would
12073 produce a conflict. */
12074 comdat_linkage (decl1);
12075 DECL_EXTERNAL (decl1) = 0;
12076 DECL_INTERFACE_KNOWN (decl1) = 1;
12077 DECL_DEFER_OUTPUT (decl1) = 1;
12081 /* This is a definition, not a reference.
12082 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12083 if (!GNU_INLINE_P (decl1))
12084 DECL_EXTERNAL (decl1) = 0;
12086 if ((DECL_DECLARED_INLINE_P (decl1)
12087 || DECL_TEMPLATE_INSTANTIATION (decl1))
12088 && ! DECL_INTERFACE_KNOWN (decl1))
12089 DECL_DEFER_OUTPUT (decl1) = 1;
12091 DECL_INTERFACE_KNOWN (decl1) = 1;
12094 /* Determine the ELF visibility attribute for the function. We must not
12095 do this before calling "pushdecl", as we must allow "duplicate_decls"
12096 to merge any attributes appropriately. We also need to wait until
12098 if (!DECL_CLONED_FUNCTION_P (decl1))
12099 determine_visibility (decl1);
12101 begin_scope (sk_function_parms, decl1);
12105 if (DECL_DESTRUCTOR_P (decl1)
12106 || (DECL_CONSTRUCTOR_P (decl1)
12107 && targetm.cxx.cdtor_returns_this ()))
12109 cdtor_label = build_decl (input_location,
12110 LABEL_DECL, NULL_TREE, NULL_TREE);
12111 DECL_CONTEXT (cdtor_label) = current_function_decl;
12114 start_fname_decls ();
12116 store_parm_decls (current_function_parms);
12120 /* Like start_preparsed_function, except that instead of a
12121 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12123 Returns 1 on success. If the DECLARATOR is not suitable for a function
12124 (it defines a datum instead), we return 0, which tells
12125 yyparse to report a parse error. */
12128 start_function (cp_decl_specifier_seq *declspecs,
12129 const cp_declarator *declarator,
12134 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12135 if (decl1 == error_mark_node)
12137 /* If the declarator is not suitable for a function definition,
12138 cause a syntax error. */
12139 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12141 error ("invalid function declaration");
12145 if (DECL_MAIN_P (decl1))
12146 /* main must return int. grokfndecl should have corrected it
12147 (and issued a diagnostic) if the user got it wrong. */
12148 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12149 integer_type_node));
12151 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12156 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12160 use_eh_spec_block (tree fn)
12162 return (flag_exceptions && flag_enforce_eh_specs
12163 && !processing_template_decl
12164 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12165 /* We insert the EH_SPEC_BLOCK only in the original
12166 function; then, it is copied automatically to the
12168 && !DECL_CLONED_FUNCTION_P (fn)
12169 /* Implicitly-generated constructors and destructors have
12170 exception specifications. However, those specifications
12171 are the union of the possible exceptions specified by the
12172 constructors/destructors for bases and members, so no
12173 unallowed exception will ever reach this function. By
12174 not creating the EH_SPEC_BLOCK we save a little memory,
12175 and we avoid spurious warnings about unreachable
12177 && !DECL_ARTIFICIAL (fn));
12180 /* Store the parameter declarations into the current function declaration.
12181 This is called after parsing the parameter declarations, before
12182 digesting the body of the function.
12184 Also install to binding contour return value identifier, if any. */
12187 store_parm_decls (tree current_function_parms)
12189 tree fndecl = current_function_decl;
12192 /* This is a chain of any other decls that came in among the parm
12193 declarations. If a parm is declared with enum {foo, bar} x;
12194 then CONST_DECLs for foo and bar are put here. */
12195 tree nonparms = NULL_TREE;
12197 if (current_function_parms)
12199 /* This case is when the function was defined with an ANSI prototype.
12200 The parms already have decls, so we need not do anything here
12201 except record them as in effect
12202 and complain if any redundant old-style parm decls were written. */
12204 tree specparms = current_function_parms;
12207 /* Must clear this because it might contain TYPE_DECLs declared
12209 current_binding_level->names = NULL;
12211 /* If we're doing semantic analysis, then we'll call pushdecl
12212 for each of these. We must do them in reverse order so that
12213 they end in the correct forward order. */
12214 specparms = nreverse (specparms);
12216 for (parm = specparms; parm; parm = next)
12218 next = TREE_CHAIN (parm);
12219 if (TREE_CODE (parm) == PARM_DECL)
12221 if (DECL_NAME (parm) == NULL_TREE
12222 || TREE_CODE (parm) != VOID_TYPE)
12225 error ("parameter %qD declared void", parm);
12229 /* If we find an enum constant or a type tag,
12230 put it aside for the moment. */
12231 TREE_CHAIN (parm) = NULL_TREE;
12232 nonparms = chainon (nonparms, parm);
12236 /* Get the decls in their original chain order and record in the
12237 function. This is all and only the PARM_DECLs that were
12238 pushed into scope by the loop above. */
12239 DECL_ARGUMENTS (fndecl) = getdecls ();
12242 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12244 /* Now store the final chain of decls for the arguments
12245 as the decl-chain of the current lexical scope.
12246 Put the enumerators in as well, at the front so that
12247 DECL_ARGUMENTS is not modified. */
12248 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12250 if (use_eh_spec_block (current_function_decl))
12251 current_eh_spec_block = begin_eh_spec_block ();
12255 /* We have finished doing semantic analysis on DECL, but have not yet
12256 generated RTL for its body. Save away our current state, so that
12257 when we want to generate RTL later we know what to do. */
12260 save_function_data (tree decl)
12262 struct language_function *f;
12264 /* Save the language-specific per-function data so that we can
12265 get it back when we really expand this function. */
12266 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12269 f = GGC_NEW (struct language_function);
12270 memcpy (f, cp_function_chain, sizeof (struct language_function));
12271 DECL_SAVED_FUNCTION_DATA (decl) = f;
12273 /* Clear out the bits we don't need. */
12274 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12275 f->bindings = NULL;
12276 f->x_local_names = NULL;
12280 /* Set the return value of the constructor (if present). */
12283 finish_constructor_body (void)
12288 if (targetm.cxx.cdtor_returns_this ()
12289 && (! TYPE_FOR_JAVA (current_class_type)))
12291 /* Any return from a constructor will end up here. */
12292 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12294 val = DECL_ARGUMENTS (current_function_decl);
12295 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12296 DECL_RESULT (current_function_decl), val);
12297 /* Return the address of the object. */
12298 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12299 add_stmt (exprstmt);
12303 /* Do all the processing for the beginning of a destructor; set up the
12304 vtable pointers and cleanups for bases and members. */
12307 begin_destructor_body (void)
12309 tree compound_stmt;
12311 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12312 issued an error message. We still want to try to process the
12313 body of the function, but initialize_vtbl_ptrs will crash if
12314 TYPE_BINFO is NULL. */
12315 if (COMPLETE_TYPE_P (current_class_type))
12317 compound_stmt = begin_compound_stmt (0);
12318 /* Make all virtual function table pointers in non-virtual base
12319 classes point to CURRENT_CLASS_TYPE's virtual function
12321 initialize_vtbl_ptrs (current_class_ptr);
12322 finish_compound_stmt (compound_stmt);
12324 /* And insert cleanups for our bases and members so that they
12325 will be properly destroyed if we throw. */
12326 push_base_cleanups ();
12330 /* At the end of every destructor we generate code to delete the object if
12331 necessary. Do that now. */
12334 finish_destructor_body (void)
12338 /* Any return from a destructor will end up here; that way all base
12339 and member cleanups will be run when the function returns. */
12340 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12342 /* In a virtual destructor, we must call delete. */
12343 if (DECL_VIRTUAL_P (current_function_decl))
12346 tree virtual_size = cxx_sizeof (current_class_type);
12350 At the point of definition of a virtual destructor (including
12351 an implicit definition), non-placement operator delete shall
12352 be looked up in the scope of the destructor's class and if
12353 found shall be accessible and unambiguous. */
12354 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12356 /*global_p=*/false,
12357 /*placement=*/NULL_TREE,
12358 /*alloc_fn=*/NULL_TREE);
12360 if_stmt = begin_if_stmt ();
12361 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12362 current_in_charge_parm,
12365 finish_expr_stmt (exprstmt);
12366 finish_then_clause (if_stmt);
12367 finish_if_stmt (if_stmt);
12370 if (targetm.cxx.cdtor_returns_this ())
12374 val = DECL_ARGUMENTS (current_function_decl);
12375 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12376 DECL_RESULT (current_function_decl), val);
12377 /* Return the address of the object. */
12378 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12379 add_stmt (exprstmt);
12383 /* Do the necessary processing for the beginning of a function body, which
12384 in this case includes member-initializers, but not the catch clauses of
12385 a function-try-block. Currently, this means opening a binding level
12386 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12389 begin_function_body (void)
12393 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12396 if (processing_template_decl)
12397 /* Do nothing now. */;
12399 /* Always keep the BLOCK node associated with the outermost pair of
12400 curly braces of a function. These are needed for correct
12401 operation of dwarfout.c. */
12402 keep_next_level (true);
12404 stmt = begin_compound_stmt (BCS_FN_BODY);
12406 if (processing_template_decl)
12407 /* Do nothing now. */;
12408 else if (DECL_DESTRUCTOR_P (current_function_decl))
12409 begin_destructor_body ();
12414 /* Do the processing for the end of a function body. Currently, this means
12415 closing out the cleanups for fully-constructed bases and members, and in
12416 the case of the destructor, deleting the object if desired. Again, this
12417 is only meaningful for [cd]tors, since they are the only functions where
12418 there is a significant distinction between the main body and any
12419 function catch clauses. Handling, say, main() return semantics here
12420 would be wrong, as flowing off the end of a function catch clause for
12421 main() would also need to return 0. */
12424 finish_function_body (tree compstmt)
12426 if (compstmt == NULL_TREE)
12429 /* Close the block. */
12430 finish_compound_stmt (compstmt);
12432 if (processing_template_decl)
12433 /* Do nothing now. */;
12434 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12435 finish_constructor_body ();
12436 else if (DECL_DESTRUCTOR_P (current_function_decl))
12437 finish_destructor_body ();
12440 /* Given a function, returns the BLOCK corresponding to the outermost level
12441 of curly braces, skipping the artificial block created for constructor
12445 outer_curly_brace_block (tree fndecl)
12447 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12448 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12449 /* Skip the artificial function body block. */
12450 block = BLOCK_SUBBLOCKS (block);
12454 /* Finish up a function declaration and compile that function
12455 all the way to assembler language output. The free the storage
12456 for the function definition.
12458 FLAGS is a bitwise or of the following values:
12460 We just finished processing the body of an in-class inline
12461 function definition. (This processing will have taken place
12462 after the class definition is complete.) */
12465 finish_function (int flags)
12467 tree fndecl = current_function_decl;
12468 tree fntype, ctype = NULL_TREE;
12469 int inclass_inline = (flags & 2) != 0;
12472 /* When we get some parse errors, we can end up without a
12473 current_function_decl, so cope. */
12474 if (fndecl == NULL_TREE)
12475 return error_mark_node;
12477 gcc_assert (!defer_mark_used_calls);
12478 defer_mark_used_calls = true;
12480 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12481 && DECL_VIRTUAL_P (fndecl)
12482 && !processing_template_decl)
12484 tree fnclass = DECL_CONTEXT (fndecl);
12485 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12486 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12489 nested = function_depth > 1;
12490 fntype = TREE_TYPE (fndecl);
12492 /* TREE_READONLY (fndecl) = 1;
12493 This caused &foo to be of type ptr-to-const-function
12494 which then got a warning when stored in a ptr-to-function variable. */
12496 gcc_assert (building_stmt_tree ());
12497 /* The current function is being defined, so its DECL_INITIAL should
12498 be set, and unless there's a multiple definition, it should be
12499 error_mark_node. */
12500 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12502 /* For a cloned function, we've already got all the code we need;
12503 there's no need to add any extra bits. */
12504 if (!DECL_CLONED_FUNCTION_P (fndecl))
12506 if (DECL_MAIN_P (current_function_decl))
12510 /* Make it so that `main' always returns 0 by default (or
12513 stmt = finish_return_stmt (integer_one_node);
12515 stmt = finish_return_stmt (integer_zero_node);
12517 /* Hack. We don't want the middle-end to warn that this
12518 return is unreachable, so put the statement on the
12521 location_t linezero = linemap_line_start (line_table, 0, 1);
12522 SET_EXPR_LOCATION (stmt, linezero);
12526 if (use_eh_spec_block (current_function_decl))
12527 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12528 (TREE_TYPE (current_function_decl)),
12529 current_eh_spec_block);
12532 /* If we're saving up tree structure, tie off the function now. */
12533 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12535 finish_fname_decls ();
12537 /* If this function can't throw any exceptions, remember that. */
12538 if (!processing_template_decl
12539 && !cp_function_chain->can_throw
12540 && !flag_non_call_exceptions
12541 && !DECL_REPLACEABLE_P (fndecl))
12542 TREE_NOTHROW (fndecl) = 1;
12544 /* This must come after expand_function_end because cleanups might
12545 have declarations (from inline functions) that need to go into
12546 this function's blocks. */
12548 /* If the current binding level isn't the outermost binding level
12549 for this function, either there is a bug, or we have experienced
12550 syntax errors and the statement tree is malformed. */
12551 if (current_binding_level->kind != sk_function_parms)
12553 /* Make sure we have already experienced errors. */
12554 gcc_assert (errorcount);
12556 /* Throw away the broken statement tree and extra binding
12558 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12560 while (current_binding_level->kind != sk_function_parms)
12562 if (current_binding_level->kind == sk_class)
12563 pop_nested_class ();
12565 poplevel (0, 0, 0);
12568 poplevel (1, 0, 1);
12570 /* Statements should always be full-expressions at the outermost set
12571 of curly braces for a function. */
12572 gcc_assert (stmts_are_full_exprs_p ());
12574 /* Set up the named return value optimization, if we can. Candidate
12575 variables are selected in check_return_expr. */
12576 if (current_function_return_value)
12578 tree r = current_function_return_value;
12581 if (r != error_mark_node
12582 /* This is only worth doing for fns that return in memory--and
12583 simpler, since we don't have to worry about promoted modes. */
12584 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12585 /* Only allow this for variables declared in the outer scope of
12586 the function so we know that their lifetime always ends with a
12587 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12588 we were to do this optimization in tree-ssa. */
12589 && (outer = outer_curly_brace_block (fndecl))
12590 && chain_member (r, BLOCK_VARS (outer)))
12591 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12593 current_function_return_value = NULL_TREE;
12596 /* Remember that we were in class scope. */
12597 if (current_class_name)
12598 ctype = current_class_type;
12600 /* Must mark the RESULT_DECL as being in this function. */
12601 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12603 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12604 to the FUNCTION_DECL node itself. */
12605 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12607 /* Save away current state, if appropriate. */
12608 if (!processing_template_decl)
12609 save_function_data (fndecl);
12611 /* Complain if there's just no return statement. */
12612 if (warn_return_type
12613 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12614 && !dependent_type_p (TREE_TYPE (fntype))
12615 && !current_function_returns_value && !current_function_returns_null
12616 /* Don't complain if we abort or throw. */
12617 && !current_function_returns_abnormally
12618 /* Don't complain if we are declared noreturn. */
12619 && !TREE_THIS_VOLATILE (fndecl)
12620 && !DECL_NAME (DECL_RESULT (fndecl))
12621 && !TREE_NO_WARNING (fndecl)
12622 /* Structor return values (if any) are set by the compiler. */
12623 && !DECL_CONSTRUCTOR_P (fndecl)
12624 && !DECL_DESTRUCTOR_P (fndecl))
12626 warning (OPT_Wreturn_type,
12627 "no return statement in function returning non-void");
12628 TREE_NO_WARNING (fndecl) = 1;
12631 /* Store the end of the function, so that we get good line number
12632 info for the epilogue. */
12633 cfun->function_end_locus = input_location;
12635 /* Complain about parameters that are only set, but never otherwise used. */
12636 if (warn_unused_but_set_parameter
12637 && !processing_template_decl
12638 && errorcount == unused_but_set_errorcount
12639 && !DECL_CLONED_FUNCTION_P (fndecl))
12643 for (decl = DECL_ARGUMENTS (fndecl);
12645 decl = TREE_CHAIN (decl))
12646 if (TREE_USED (decl)
12647 && TREE_CODE (decl) == PARM_DECL
12648 && !DECL_READ_P (decl)
12649 && DECL_NAME (decl)
12650 && !DECL_ARTIFICIAL (decl)
12651 && !TREE_NO_WARNING (decl)
12652 && !DECL_IN_SYSTEM_HEADER (decl)
12653 && TREE_TYPE (decl) != error_mark_node
12654 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12655 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12656 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12657 warning (OPT_Wunused_but_set_parameter,
12658 "parameter %q+D set but not used", decl);
12659 unused_but_set_errorcount = errorcount;
12662 /* Genericize before inlining. */
12663 if (!processing_template_decl)
12665 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12666 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12667 cp_genericize (fndecl);
12668 /* Clear out the bits we don't need. */
12669 f->x_current_class_ptr = NULL;
12670 f->x_current_class_ref = NULL;
12671 f->x_eh_spec_block = NULL;
12672 f->x_in_charge_parm = NULL;
12673 f->x_vtt_parm = NULL;
12674 f->x_return_value = NULL;
12675 f->bindings = NULL;
12676 f->extern_decl_map = NULL;
12678 /* Clear out the bits we don't need. */
12679 local_names = NULL;
12681 /* We're leaving the context of this function, so zap cfun. It's still in
12682 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12684 current_function_decl = NULL;
12686 /* If this is an in-class inline definition, we may have to pop the
12687 bindings for the template parameters that we added in
12688 maybe_begin_member_template_processing when start_function was
12690 if (inclass_inline)
12691 maybe_end_member_template_processing ();
12693 /* Leave the scope of the class. */
12695 pop_nested_class ();
12701 /* Let the error reporting routines know that we're outside a
12702 function. For a nested function, this value is used in
12703 cxx_pop_function_context and then reset via pop_function_context. */
12704 current_function_decl = NULL_TREE;
12706 defer_mark_used_calls = false;
12707 if (deferred_mark_used_calls)
12712 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12714 VEC_free (tree, gc, deferred_mark_used_calls);
12720 /* Create the FUNCTION_DECL for a function definition.
12721 DECLSPECS and DECLARATOR are the parts of the declaration;
12722 they describe the return type and the name of the function,
12723 but twisted together in a fashion that parallels the syntax of C.
12725 This function creates a binding context for the function body
12726 as well as setting up the FUNCTION_DECL in current_function_decl.
12728 Returns a FUNCTION_DECL on success.
12730 If the DECLARATOR is not suitable for a function (it defines a datum
12731 instead), we return 0, which tells yyparse to report a parse error.
12733 May return void_type_node indicating that this method is actually
12734 a friend. See grokfield for more details.
12736 Came here with a `.pushlevel' .
12738 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12739 CHANGES TO CODE IN `grokfield'. */
12742 grokmethod (cp_decl_specifier_seq *declspecs,
12743 const cp_declarator *declarator, tree attrlist)
12745 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12748 if (fndecl == error_mark_node)
12749 return error_mark_node;
12751 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12753 error ("invalid member function declaration");
12754 return error_mark_node;
12758 cplus_decl_attributes (&fndecl, attrlist, 0);
12760 /* Pass friends other than inline friend functions back. */
12761 if (fndecl == void_type_node)
12764 if (DECL_IN_AGGR_P (fndecl))
12766 if (DECL_CONTEXT (fndecl)
12767 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12768 error ("%qD is already defined in class %qT", fndecl,
12769 DECL_CONTEXT (fndecl));
12770 return error_mark_node;
12773 check_template_shadow (fndecl);
12775 DECL_DECLARED_INLINE_P (fndecl) = 1;
12776 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12778 /* We process method specializations in finish_struct_1. */
12779 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12781 fndecl = push_template_decl (fndecl);
12782 if (fndecl == error_mark_node)
12786 if (! DECL_FRIEND_P (fndecl))
12788 if (TREE_CHAIN (fndecl))
12790 fndecl = copy_node (fndecl);
12791 TREE_CHAIN (fndecl) = NULL_TREE;
12795 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12797 DECL_IN_AGGR_P (fndecl) = 1;
12802 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12803 we can lay it out later, when and if its type becomes complete. */
12806 maybe_register_incomplete_var (tree var)
12808 gcc_assert (TREE_CODE (var) == VAR_DECL);
12810 /* Keep track of variables with incomplete types. */
12811 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12812 && DECL_EXTERNAL (var))
12814 tree inner_type = TREE_TYPE (var);
12816 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12817 inner_type = TREE_TYPE (inner_type);
12818 inner_type = TYPE_MAIN_VARIANT (inner_type);
12820 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12821 /* RTTI TD entries are created while defining the type_info. */
12822 || (TYPE_LANG_SPECIFIC (inner_type)
12823 && TYPE_BEING_DEFINED (inner_type)))
12824 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12828 /* Called when a class type (given by TYPE) is defined. If there are
12829 any existing VAR_DECLs whose type has been completed by this
12830 declaration, update them now. */
12833 complete_vars (tree type)
12835 tree *list = &incomplete_vars;
12837 gcc_assert (CLASS_TYPE_P (type));
12840 if (same_type_p (type, TREE_PURPOSE (*list)))
12842 tree var = TREE_VALUE (*list);
12843 tree type = TREE_TYPE (var);
12844 /* Complete the type of the variable. The VAR_DECL itself
12845 will be laid out in expand_expr. */
12846 complete_type (type);
12847 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12848 /* Remove this entry from the list. */
12849 *list = TREE_CHAIN (*list);
12852 list = &TREE_CHAIN (*list);
12855 /* Check for pending declarations which may have abstract type. */
12856 complete_type_check_abstract (type);
12859 /* If DECL is of a type which needs a cleanup, build and return an
12860 expression to perform that cleanup here. Return NULL_TREE if no
12861 cleanup need be done. */
12864 cxx_maybe_build_cleanup (tree decl)
12870 /* Assume no cleanup is required. */
12871 cleanup = NULL_TREE;
12873 if (error_operand_p (decl))
12876 /* Handle "__attribute__((cleanup))". We run the cleanup function
12877 before the destructor since the destructor is what actually
12878 terminates the lifetime of the object. */
12879 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12886 /* Get the name specified by the user for the cleanup function. */
12887 id = TREE_VALUE (TREE_VALUE (attr));
12888 /* Look up the name to find the cleanup function to call. It is
12889 important to use lookup_name here because that is what is
12890 used in c-common.c:handle_cleanup_attribute when performing
12891 initial checks on the attribute. Note that those checks
12892 include ensuring that the function found is not an overloaded
12893 function, or an object with an overloaded call operator,
12894 etc.; we can rely on the fact that the function found is an
12895 ordinary FUNCTION_DECL. */
12896 fn = lookup_name (id);
12897 arg = build_address (decl);
12899 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12901 tf_warning_or_error);
12903 /* Handle ordinary C++ destructors. */
12904 type = TREE_TYPE (decl);
12905 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12907 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12908 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12909 && CLASSTYPE_VBASECLASSES (type));
12913 if (TREE_CODE (type) == ARRAY_TYPE)
12916 addr = build_address (decl);
12918 /* Optimize for space over speed here. */
12919 if (!has_vbases || flag_expensive_optimizations)
12920 flags |= LOOKUP_NONVIRTUAL;
12922 call = build_delete (TREE_TYPE (addr), addr,
12923 sfk_complete_destructor, flags, 0);
12925 cleanup = build_compound_expr (input_location, cleanup, call);
12933 /* When a stmt has been parsed, this function is called. */
12940 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
12941 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
12942 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
12945 static_fn_type (tree memfntype)
12951 if (TYPE_PTRMEMFUNC_P (memfntype))
12952 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
12953 if (POINTER_TYPE_P (memfntype)
12954 || TREE_CODE (memfntype) == FUNCTION_DECL)
12955 memfntype = TREE_TYPE (memfntype);
12956 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
12958 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
12959 args = TYPE_ARG_TYPES (memfntype);
12960 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
12961 quals = cp_type_quals (TREE_TYPE (TREE_VALUE (args)));
12962 fntype = build_qualified_type (fntype, quals);
12963 fntype = (cp_build_type_attribute_variant
12964 (fntype, TYPE_ATTRIBUTES (memfntype)));
12965 fntype = (build_exception_variant
12966 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
12970 /* DECL was originally constructed as a non-static member function,
12971 but turned out to be static. Update it accordingly. */
12974 revert_static_member_fn (tree decl)
12976 TREE_TYPE (decl) = static_fn_type (decl);
12978 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
12979 error ("static member function %q#D declared with type qualifiers", decl);
12981 if (DECL_ARGUMENTS (decl))
12982 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12983 DECL_STATIC_FUNCTION_P (decl) = 1;
12986 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12987 one of the language-independent trees. */
12989 enum cp_tree_node_structure_enum
12990 cp_tree_node_structure (union lang_tree_node * t)
12992 switch (TREE_CODE (&t->generic))
12994 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12995 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12996 case OVERLOAD: return TS_CP_OVERLOAD;
12997 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12998 case PTRMEM_CST: return TS_CP_PTRMEM;
12999 case BASELINK: return TS_CP_BASELINK;
13000 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13001 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13002 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13003 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13004 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13005 default: return TS_CP_GENERIC;
13009 /* Build the void_list_node (void_type_node having been created). */
13011 build_void_list_node (void)
13013 tree t = build_tree_list (NULL_TREE, void_type_node);
13018 cp_missing_noreturn_ok_p (tree decl)
13020 /* A missing noreturn is ok for the `main' function. */
13021 return DECL_MAIN_P (decl);
13024 /* Return the COMDAT group into which DECL should be placed. */
13027 cxx_comdat_group (tree decl)
13031 /* Virtual tables, construction virtual tables, and virtual table
13032 tables all go in a single COMDAT group, named after the primary
13034 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13035 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13036 /* For all other DECLs, the COMDAT group is the mangled name of the
13037 declaration itself. */
13040 while (DECL_THUNK_P (decl))
13042 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13043 into the same section as the target function. In that case
13044 we must return target's name. */
13045 tree target = THUNK_TARGET (decl);
13046 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13047 && DECL_SECTION_NAME (target) != NULL
13048 && DECL_ONE_ONLY (target))
13053 name = DECL_ASSEMBLER_NAME (decl);
13059 #include "gt-cp-decl.h"