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, 2011
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"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, tree *);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 struct cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 struct cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
273 struct cp_binding_level *b;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 struct cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 struct cp_binding_level *bl = (struct cp_binding_level *) data;
474 struct cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
648 tree name = DECL_NAME (link);
652 ob = outer_binding (name,
653 IDENTIFIER_BINDING (name),
656 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
658 ns_binding = NULL_TREE;
660 if (ob && ob->scope == current_binding_level->level_chain)
661 /* We have something like:
666 and we are leaving the `for' scope. There's no reason to
667 keep the binding of the inner `i' in this case. */
668 pop_binding (name, link);
669 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
670 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
671 /* Here, we have something like:
679 We must pop the for-scope binding so we know what's a
680 type and what isn't. */
681 pop_binding (name, link);
684 /* Mark this VAR_DECL as dead so that we can tell we left it
685 there only for backward compatibility. */
686 DECL_DEAD_FOR_LOCAL (link) = 1;
688 /* Keep track of what should have happened when we
689 popped the binding. */
692 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
693 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
696 /* Add it to the list of dead variables in the next
697 outermost binding to that we can remove these when we
698 leave that binding. */
699 VEC_safe_push (tree, gc,
700 current_binding_level->level_chain->dead_vars_from_for,
703 /* Although we don't pop the cxx_binding, we do clear
704 its SCOPE since the scope is going away now. */
705 IDENTIFIER_BINDING (name)->scope
706 = current_binding_level->level_chain;
713 /* Remove the binding. */
716 if (TREE_CODE (decl) == TREE_LIST)
717 decl = TREE_VALUE (decl);
720 if (TREE_CODE (name) == OVERLOAD)
721 name = OVL_FUNCTION (name);
723 gcc_assert (DECL_P (name));
724 pop_binding (DECL_NAME (name), decl);
728 /* Remove declarations for any `for' variables from inner scopes
729 that we kept around. */
730 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
732 pop_binding (DECL_NAME (decl), decl);
734 /* Restore the IDENTIFIER_TYPE_VALUEs. */
735 for (link = current_binding_level->type_shadowed;
736 link; link = TREE_CHAIN (link))
737 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
739 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
740 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
741 current_binding_level->shadowed_labels,
743 pop_local_label (label_bind->label, label_bind->prev_value);
745 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
746 list if a `using' declaration put them there. The debugging
747 back ends won't understand OVERLOAD, so we remove them here.
748 Because the BLOCK_VARS are (temporarily) shared with
749 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
750 popped all the bindings. */
755 for (d = &BLOCK_VARS (block); *d; )
757 if (TREE_CODE (*d) == TREE_LIST)
758 *d = TREE_CHAIN (*d);
760 d = &DECL_CHAIN (*d);
764 /* If the level being exited is the top level of a function,
765 check over all the labels. */
768 /* Since this is the top level block of a function, the vars are
769 the function's parameters. Don't leave them in the BLOCK
770 because they are found in the FUNCTION_DECL instead. */
771 BLOCK_VARS (block) = 0;
775 kind = current_binding_level->kind;
776 if (kind == sk_cleanup)
780 /* If this is a temporary binding created for a cleanup, then we'll
781 have pushed a statement list level. Pop that, create a new
782 BIND_EXPR for the block, and insert it into the stream. */
783 stmt = pop_stmt_list (current_binding_level->statement_list);
784 stmt = c_build_bind_expr (input_location, block, stmt);
791 /* The current function is being defined, so its DECL_INITIAL
792 should be error_mark_node. */
793 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
794 DECL_INITIAL (current_function_decl) = block;
797 current_binding_level->blocks
798 = block_chainon (current_binding_level->blocks, block);
800 /* If we did not make a block for the level just exited,
801 any blocks made for inner levels
802 (since they cannot be recorded as subblocks in that level)
803 must be carried forward so they will later become subblocks
804 of something else. */
806 current_binding_level->blocks
807 = block_chainon (current_binding_level->blocks, subblocks);
809 /* Each and every BLOCK node created here in `poplevel' is important
810 (e.g. for proper debugging information) so if we created one
811 earlier, mark it as "used". */
813 TREE_USED (block) = 1;
815 /* All temporary bindings created for cleanups are popped silently. */
816 if (kind == sk_cleanup)
819 timevar_stop (TV_NAME_LOOKUP);
823 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
824 itself, calling F for each. The DATA is passed to F as well. */
827 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
830 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
832 result |= (*f) (name_space, data);
834 for (; current; current = DECL_CHAIN (current))
835 result |= walk_namespaces_r (current, f, data);
840 /* Walk all the namespaces, calling F for each. The DATA is passed to
844 walk_namespaces (walk_namespaces_fn f, void* data)
846 return walk_namespaces_r (global_namespace, f, data);
849 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
850 DATA is non-NULL, this is the last time we will call
851 wrapup_global_declarations for this NAMESPACE. */
854 wrapup_globals_for_namespace (tree name_space, void* data)
856 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
857 VEC(tree,gc) *statics = level->static_decls;
858 tree *vec = VEC_address (tree, statics);
859 int len = VEC_length (tree, statics);
860 int last_time = (data != 0);
864 check_global_declarations (vec, len);
865 emit_debug_global_declarations (vec, len);
869 /* Write out any globals that need to be output. */
870 return wrapup_global_declarations (vec, len);
874 /* In C++, you don't have to write `struct S' to refer to `S'; you
875 can just use `S'. We accomplish this by creating a TYPE_DECL as
876 if the user had written `typedef struct S S'. Create and return
877 the TYPE_DECL for TYPE. */
880 create_implicit_typedef (tree name, tree type)
884 decl = build_decl (input_location, TYPE_DECL, name, type);
885 DECL_ARTIFICIAL (decl) = 1;
886 /* There are other implicit type declarations, like the one *within*
887 a class that allows you to write `S::S'. We must distinguish
889 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
890 TYPE_NAME (type) = decl;
891 TYPE_STUB_DECL (type) = decl;
896 /* Remember a local name for name-mangling purposes. */
899 push_local_name (tree decl)
904 timevar_start (TV_NAME_LOOKUP);
906 name = DECL_NAME (decl);
908 nelts = VEC_length (tree, local_names);
909 for (i = 0; i < nelts; i++)
911 t = VEC_index (tree, local_names, i);
912 if (DECL_NAME (t) == name)
914 if (!DECL_LANG_SPECIFIC (decl))
915 retrofit_lang_decl (decl);
916 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
917 if (DECL_LANG_SPECIFIC (t))
918 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
920 DECL_DISCRIMINATOR (decl) = 1;
922 VEC_replace (tree, local_names, i, decl);
923 timevar_stop (TV_NAME_LOOKUP);
928 VEC_safe_push (tree, gc, local_names, decl);
929 timevar_stop (TV_NAME_LOOKUP);
932 /* Subroutine of duplicate_decls: return truthvalue of whether
933 or not types of these decls match.
935 For C++, we must compare the parameter list so that `int' can match
936 `int&' in a parameter position, but `int&' is not confused with
940 decls_match (tree newdecl, tree olddecl)
944 if (newdecl == olddecl)
947 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
948 /* If the two DECLs are not even the same kind of thing, we're not
949 interested in their types. */
952 if (TREE_CODE (newdecl) == FUNCTION_DECL)
954 tree f1 = TREE_TYPE (newdecl);
955 tree f2 = TREE_TYPE (olddecl);
956 tree p1 = TYPE_ARG_TYPES (f1);
957 tree p2 = TYPE_ARG_TYPES (f2);
959 /* Specializations of different templates are different functions
960 even if they have the same type. */
961 tree t1 = (DECL_USE_TEMPLATE (newdecl)
962 ? DECL_TI_TEMPLATE (newdecl)
964 tree t2 = (DECL_USE_TEMPLATE (olddecl)
965 ? DECL_TI_TEMPLATE (olddecl)
970 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
971 && ! (DECL_EXTERN_C_P (newdecl)
972 && DECL_EXTERN_C_P (olddecl)))
975 #ifdef NO_IMPLICIT_EXTERN_C
976 /* A new declaration doesn't match a built-in one unless it
977 is also extern "C". */
978 if (DECL_IS_BUILTIN (olddecl)
979 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
983 if (TREE_CODE (f1) != TREE_CODE (f2))
986 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
988 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
989 && (DECL_BUILT_IN (olddecl)
990 #ifndef NO_IMPLICIT_EXTERN_C
991 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
992 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
996 types_match = self_promoting_args_p (p1);
997 if (p1 == void_list_node)
998 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1000 #ifndef NO_IMPLICIT_EXTERN_C
1001 else if (!prototype_p (f1)
1002 && (DECL_EXTERN_C_P (olddecl)
1003 && DECL_IN_SYSTEM_HEADER (olddecl)
1004 && !DECL_CLASS_SCOPE_P (olddecl))
1005 && (DECL_EXTERN_C_P (newdecl)
1006 && DECL_IN_SYSTEM_HEADER (newdecl)
1007 && !DECL_CLASS_SCOPE_P (newdecl)))
1009 types_match = self_promoting_args_p (p2);
1010 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1016 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1017 || comp_type_attributes (TREE_TYPE (newdecl),
1018 TREE_TYPE (olddecl)) != 0);
1023 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1025 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1026 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1029 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1030 DECL_TEMPLATE_PARMS (olddecl)))
1033 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1034 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1035 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1037 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1038 DECL_TEMPLATE_RESULT (newdecl));
1042 /* Need to check scope for variable declaration (VAR_DECL).
1043 For typedef (TYPE_DECL), scope is ignored. */
1044 if (TREE_CODE (newdecl) == VAR_DECL
1045 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1047 Two declarations for an object with C language linkage
1048 with the same name (ignoring the namespace that qualify
1049 it) that appear in different namespace scopes refer to
1051 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1054 if (TREE_TYPE (newdecl) == error_mark_node)
1055 types_match = TREE_TYPE (olddecl) == error_mark_node;
1056 else if (TREE_TYPE (olddecl) == NULL_TREE)
1057 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1058 else if (TREE_TYPE (newdecl) == NULL_TREE)
1061 types_match = comptypes (TREE_TYPE (newdecl),
1062 TREE_TYPE (olddecl),
1063 COMPARE_REDECLARATION);
1069 /* If NEWDECL is `static' and an `extern' was seen previously,
1070 warn about it. OLDDECL is the previous declaration.
1072 Note that this does not apply to the C++ case of declaring
1073 a variable `extern const' and then later `const'.
1075 Don't complain about built-in functions, since they are beyond
1076 the user's control. */
1079 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1081 if (TREE_CODE (newdecl) == TYPE_DECL
1082 || TREE_CODE (newdecl) == TEMPLATE_DECL
1083 || TREE_CODE (newdecl) == CONST_DECL
1084 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1087 /* Don't get confused by static member functions; that's a different
1089 if (TREE_CODE (newdecl) == FUNCTION_DECL
1090 && DECL_STATIC_FUNCTION_P (newdecl))
1093 /* If the old declaration was `static', or the new one isn't, then
1094 everything is OK. */
1095 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1098 /* It's OK to declare a builtin function as `static'. */
1099 if (TREE_CODE (olddecl) == FUNCTION_DECL
1100 && DECL_ARTIFICIAL (olddecl))
1103 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1104 permerror (input_location, "previous declaration of %q+D", olddecl);
1107 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1108 function templates. If their exception specifications do not
1109 match, issue a diagnostic. */
1112 check_redeclaration_exception_specification (tree new_decl,
1117 tree new_exceptions;
1118 tree old_exceptions;
1120 new_type = TREE_TYPE (new_decl);
1121 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1122 old_type = TREE_TYPE (old_decl);
1123 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1127 If any declaration of a function has an exception-specification,
1128 all declarations, including the definition and an explicit
1129 specialization, of that function shall have an
1130 exception-specification with the same set of type-ids. */
1131 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1132 && ! DECL_IS_BUILTIN (old_decl)
1134 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1136 error ("declaration of %qF has a different exception specifier",
1138 error ("from previous declaration %q+F", old_decl);
1142 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1143 Otherwise issue diagnostics. */
1146 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1148 old_decl = STRIP_TEMPLATE (old_decl);
1149 new_decl = STRIP_TEMPLATE (new_decl);
1150 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1151 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1153 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1154 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1156 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1158 /* Hide a built-in declaration. */
1159 DECL_DECLARED_CONSTEXPR_P (old_decl)
1160 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1163 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1164 error ("from previous declaration %q+D", old_decl);
1168 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1169 && lookup_attribute ("gnu_inline", \
1170 DECL_ATTRIBUTES (fn)))
1172 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1173 If the redeclaration is invalid, a diagnostic is issued, and the
1174 error_mark_node is returned. Otherwise, OLDDECL is returned.
1176 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1179 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1182 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1184 unsigned olddecl_uid = DECL_UID (olddecl);
1185 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1186 int new_defines_function = 0;
1187 tree new_template_info;
1189 if (newdecl == olddecl)
1192 types_match = decls_match (newdecl, olddecl);
1194 /* If either the type of the new decl or the type of the old decl is an
1195 error_mark_node, then that implies that we have already issued an
1196 error (earlier) for some bogus type specification, and in that case,
1197 it is rather pointless to harass the user with yet more error message
1198 about the same declaration, so just pretend the types match here. */
1199 if (TREE_TYPE (newdecl) == error_mark_node
1200 || TREE_TYPE (olddecl) == error_mark_node)
1201 return error_mark_node;
1203 if (DECL_P (olddecl)
1204 && TREE_CODE (newdecl) == FUNCTION_DECL
1205 && TREE_CODE (olddecl) == FUNCTION_DECL
1206 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1208 if (DECL_DECLARED_INLINE_P (newdecl)
1209 && DECL_UNINLINABLE (newdecl)
1210 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1211 /* Already warned elsewhere. */;
1212 else if (DECL_DECLARED_INLINE_P (olddecl)
1213 && DECL_UNINLINABLE (olddecl)
1214 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1215 /* Already warned. */;
1216 else if (DECL_DECLARED_INLINE_P (newdecl)
1217 && DECL_UNINLINABLE (olddecl)
1218 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1220 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1222 warning (OPT_Wattributes, "previous declaration of %q+D "
1223 "with attribute noinline", olddecl);
1225 else if (DECL_DECLARED_INLINE_P (olddecl)
1226 && DECL_UNINLINABLE (newdecl)
1227 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 warning (OPT_Wattributes, "function %q+D redeclared with "
1230 "attribute noinline", newdecl);
1231 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1236 /* Check for redeclaration and other discrepancies. */
1237 if (TREE_CODE (olddecl) == FUNCTION_DECL
1238 && DECL_ARTIFICIAL (olddecl))
1240 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1241 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1243 /* Avoid warnings redeclaring built-ins which have not been
1244 explicitly declared. */
1245 if (DECL_ANTICIPATED (olddecl))
1248 /* If you declare a built-in or predefined function name as static,
1249 the old definition is overridden, but optionally warn this was a
1250 bad choice of name. */
1251 if (! TREE_PUBLIC (newdecl))
1253 warning (OPT_Wshadow,
1254 DECL_BUILT_IN (olddecl)
1255 ? G_("shadowing built-in function %q#D")
1256 : G_("shadowing library function %q#D"), olddecl);
1257 /* Discard the old built-in function. */
1260 /* If the built-in is not ansi, then programs can override
1261 it even globally without an error. */
1262 else if (! DECL_BUILT_IN (olddecl))
1263 warning (0, "library function %q#D redeclared as non-function %q#D",
1267 error ("declaration of %q#D", newdecl);
1268 error ("conflicts with built-in declaration %q#D",
1273 else if (!types_match)
1275 /* Avoid warnings redeclaring built-ins which have not been
1276 explicitly declared. */
1277 if (DECL_ANTICIPATED (olddecl))
1279 /* Deal with fileptr_type_node. FILE type is not known
1280 at the time we create the builtins. */
1283 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1284 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1286 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1289 else if (TREE_VALUE (t2) == fileptr_type_node)
1291 tree t = TREE_VALUE (t1);
1293 if (TREE_CODE (t) == POINTER_TYPE
1294 && TYPE_NAME (TREE_TYPE (t))
1295 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1296 == get_identifier ("FILE")
1297 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1299 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1301 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1302 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1303 types_match = decls_match (newdecl, olddecl);
1305 return duplicate_decls (newdecl, olddecl,
1307 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1310 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1313 else if ((DECL_EXTERN_C_P (newdecl)
1314 && DECL_EXTERN_C_P (olddecl))
1315 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1316 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1318 /* A near match; override the builtin. */
1320 if (TREE_PUBLIC (newdecl))
1322 warning (0, "new declaration %q#D", newdecl);
1323 warning (0, "ambiguates built-in declaration %q#D",
1327 warning (OPT_Wshadow,
1328 DECL_BUILT_IN (olddecl)
1329 ? G_("shadowing built-in function %q#D")
1330 : G_("shadowing library function %q#D"), olddecl);
1333 /* Discard the old built-in function. */
1336 /* Replace the old RTL to avoid problems with inlining. */
1337 COPY_DECL_RTL (newdecl, olddecl);
1339 /* Even if the types match, prefer the new declarations type for
1340 built-ins which have not been explicitly declared, for
1341 exception lists, etc... */
1342 else if (DECL_IS_BUILTIN (olddecl))
1344 tree type = TREE_TYPE (newdecl);
1345 tree attribs = (*targetm.merge_type_attributes)
1346 (TREE_TYPE (olddecl), type);
1348 type = cp_build_type_attribute_variant (type, attribs);
1349 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1352 /* If a function is explicitly declared "throw ()", propagate that to
1353 the corresponding builtin. */
1354 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1355 && DECL_ANTICIPATED (olddecl)
1356 && TREE_NOTHROW (newdecl)
1357 && !TREE_NOTHROW (olddecl)
1358 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1359 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1361 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1363 /* Whether or not the builtin can throw exceptions has no
1364 bearing on this declarator. */
1365 TREE_NOTHROW (olddecl) = 0;
1367 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1369 /* If a builtin function is redeclared as `static', merge
1370 the declarations, but make the original one static. */
1371 DECL_THIS_STATIC (olddecl) = 1;
1372 TREE_PUBLIC (olddecl) = 0;
1374 /* Make the old declaration consistent with the new one so
1375 that all remnants of the builtin-ness of this function
1376 will be banished. */
1377 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1378 COPY_DECL_RTL (newdecl, olddecl);
1381 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1383 /* C++ Standard, 3.3, clause 4:
1384 "[Note: a namespace name or a class template name must be unique
1385 in its declarative region (7.3.2, clause 14). ]" */
1386 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1387 && TREE_CODE (newdecl) != NAMESPACE_DECL
1388 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1389 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1390 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1391 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1393 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1394 && TREE_CODE (newdecl) != TYPE_DECL)
1395 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1396 && TREE_CODE (olddecl) != TYPE_DECL))
1398 /* We do nothing special here, because C++ does such nasty
1399 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1400 get shadowed, and know that if we need to find a TYPE_DECL
1401 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1402 slot of the identifier. */
1406 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1407 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1408 || (TREE_CODE (olddecl) == FUNCTION_DECL
1409 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1413 error ("%q#D redeclared as different kind of symbol", newdecl);
1414 if (TREE_CODE (olddecl) == TREE_LIST)
1415 olddecl = TREE_VALUE (olddecl);
1416 error ("previous declaration of %q+#D", olddecl);
1418 return error_mark_node;
1420 else if (!types_match)
1422 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1423 /* These are certainly not duplicate declarations; they're
1424 from different scopes. */
1427 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1429 /* The name of a class template may not be declared to refer to
1430 any other template, class, function, object, namespace, value,
1431 or type in the same scope. */
1432 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1433 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1435 error ("declaration of template %q#D", newdecl);
1436 error ("conflicts with previous declaration %q+#D", olddecl);
1438 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1439 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1440 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1441 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1442 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1443 DECL_TEMPLATE_PARMS (olddecl))
1444 /* Template functions can be disambiguated by
1446 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1447 TREE_TYPE (TREE_TYPE (olddecl))))
1449 error ("new declaration %q#D", newdecl);
1450 error ("ambiguates old declaration %q+#D", olddecl);
1454 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1456 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1458 error ("declaration of C function %q#D conflicts with",
1460 error ("previous declaration %q+#D here", olddecl);
1463 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1464 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1466 error ("new declaration %q#D", newdecl);
1467 error ("ambiguates old declaration %q+#D", olddecl);
1468 return error_mark_node;
1475 error ("conflicting declaration %q#D", newdecl);
1476 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1477 return error_mark_node;
1480 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1481 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1482 && (!DECL_TEMPLATE_INFO (newdecl)
1483 || (DECL_TI_TEMPLATE (newdecl)
1484 != DECL_TI_TEMPLATE (olddecl))))
1485 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1486 && (!DECL_TEMPLATE_INFO (olddecl)
1487 || (DECL_TI_TEMPLATE (olddecl)
1488 != DECL_TI_TEMPLATE (newdecl))))))
1489 /* It's OK to have a template specialization and a non-template
1490 with the same type, or to have specializations of two
1491 different templates with the same type. Note that if one is a
1492 specialization, and the other is an instantiation of the same
1493 template, that we do not exit at this point. That situation
1494 can occur if we instantiate a template class, and then
1495 specialize one of its methods. This situation is valid, but
1496 the declarations must be merged in the usual way. */
1498 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1499 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1500 && !DECL_USE_TEMPLATE (newdecl))
1501 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1502 && !DECL_USE_TEMPLATE (olddecl))))
1503 /* One of the declarations is a template instantiation, and the
1504 other is not a template at all. That's OK. */
1506 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1508 /* In [namespace.alias] we have:
1510 In a declarative region, a namespace-alias-definition can be
1511 used to redefine a namespace-alias declared in that declarative
1512 region to refer only to the namespace to which it already
1515 Therefore, if we encounter a second alias directive for the same
1516 alias, we can just ignore the second directive. */
1517 if (DECL_NAMESPACE_ALIAS (newdecl)
1518 && (DECL_NAMESPACE_ALIAS (newdecl)
1519 == DECL_NAMESPACE_ALIAS (olddecl)))
1521 /* [namespace.alias]
1523 A namespace-name or namespace-alias shall not be declared as
1524 the name of any other entity in the same declarative region.
1525 A namespace-name defined at global scope shall not be
1526 declared as the name of any other entity in any global scope
1528 error ("declaration of namespace %qD conflicts with", newdecl);
1529 error ("previous declaration of namespace %q+D here", olddecl);
1530 return error_mark_node;
1534 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1537 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1538 if (DECL_NAME (olddecl) != NULL_TREE)
1539 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1540 ? "%q+#D previously defined here"
1541 : "%q+#D previously declared here", olddecl);
1542 return error_mark_node;
1544 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1545 && DECL_INITIAL (olddecl) != NULL_TREE
1546 && !prototype_p (TREE_TYPE (olddecl))
1547 && prototype_p (TREE_TYPE (newdecl)))
1549 /* Prototype decl follows defn w/o prototype. */
1550 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1551 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1552 "follows non-prototype definition here");
1554 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1555 || TREE_CODE (olddecl) == VAR_DECL)
1556 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1559 If two declarations of the same function or object
1560 specify different linkage-specifications ..., the program
1561 is ill-formed.... Except for functions with C++ linkage,
1562 a function declaration without a linkage specification
1563 shall not precede the first linkage specification for
1564 that function. A function can be declared without a
1565 linkage specification after an explicit linkage
1566 specification has been seen; the linkage explicitly
1567 specified in the earlier declaration is not affected by
1568 such a function declaration.
1570 DR 563 raises the question why the restrictions on
1571 functions should not also apply to objects. Older
1572 versions of G++ silently ignore the linkage-specification
1580 which is clearly wrong. Therefore, we now treat objects
1582 if (current_lang_depth () == 0)
1584 /* There is no explicit linkage-specification, so we use
1585 the linkage from the previous declaration. */
1586 if (!DECL_LANG_SPECIFIC (newdecl))
1587 retrofit_lang_decl (newdecl);
1588 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1592 error ("previous declaration of %q+#D with %qL linkage",
1593 olddecl, DECL_LANGUAGE (olddecl));
1594 error ("conflicts with new declaration with %qL linkage",
1595 DECL_LANGUAGE (newdecl));
1599 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1601 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1603 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1604 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1607 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1608 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1610 for (; t1 && t1 != void_list_node;
1611 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1612 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1614 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1617 permerror (input_location, "default argument given for parameter %d of %q#D",
1619 permerror (input_location, "after previous specification in %q+#D", olddecl);
1623 error ("default argument given for parameter %d of %q#D",
1625 error ("after previous specification in %q+#D",
1632 /* Do not merge an implicit typedef with an explicit one. In:
1636 typedef class A A __attribute__ ((foo));
1638 the attribute should apply only to the typedef. */
1639 if (TREE_CODE (olddecl) == TYPE_DECL
1640 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1641 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1644 /* If new decl is `static' and an `extern' was seen previously,
1646 warn_extern_redeclared_static (newdecl, olddecl);
1648 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1649 return error_mark_node;
1651 /* We have committed to returning 1 at this point. */
1652 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1654 /* Now that functions must hold information normally held
1655 by field decls, there is extra work to do so that
1656 declaration information does not get destroyed during
1658 if (DECL_VINDEX (olddecl))
1659 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1660 if (DECL_CONTEXT (olddecl))
1661 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1662 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1663 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1664 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1665 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1666 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1667 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1668 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1669 SET_OVERLOADED_OPERATOR_CODE
1670 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1671 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1673 /* Optionally warn about more than one declaration for the same
1674 name, but don't warn about a function declaration followed by a
1676 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1677 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1678 /* Don't warn about extern decl followed by definition. */
1679 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1680 /* Don't warn about friends, let add_friend take care of it. */
1681 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1683 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1684 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1687 if (DECL_DELETED_FN (newdecl))
1689 error ("deleted definition of %qD", newdecl);
1690 error ("after previous declaration %q+D", olddecl);
1692 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1695 /* Deal with C++: must preserve virtual function table size. */
1696 if (TREE_CODE (olddecl) == TYPE_DECL)
1698 tree newtype = TREE_TYPE (newdecl);
1699 tree oldtype = TREE_TYPE (olddecl);
1701 if (newtype != error_mark_node && oldtype != error_mark_node
1702 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1703 CLASSTYPE_FRIEND_CLASSES (newtype)
1704 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1706 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1709 /* Copy all the DECL_... slots specified in the new decl
1710 except for any that we copy here from the old type. */
1711 DECL_ATTRIBUTES (newdecl)
1712 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1714 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1718 old_result = DECL_TEMPLATE_RESULT (olddecl);
1719 new_result = DECL_TEMPLATE_RESULT (newdecl);
1720 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1721 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1722 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1723 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1725 DECL_ATTRIBUTES (old_result)
1726 = (*targetm.merge_decl_attributes) (old_result, new_result);
1728 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1730 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1731 && DECL_INITIAL (new_result))
1733 if (DECL_INITIAL (old_result))
1734 DECL_UNINLINABLE (old_result) = 1;
1736 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1737 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1738 DECL_NOT_REALLY_EXTERN (old_result)
1739 = DECL_NOT_REALLY_EXTERN (new_result);
1740 DECL_INTERFACE_KNOWN (old_result)
1741 = DECL_INTERFACE_KNOWN (new_result);
1742 DECL_DECLARED_INLINE_P (old_result)
1743 = DECL_DECLARED_INLINE_P (new_result);
1744 DECL_DISREGARD_INLINE_LIMITS (old_result)
1745 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1750 DECL_DECLARED_INLINE_P (old_result)
1751 |= DECL_DECLARED_INLINE_P (new_result);
1752 DECL_DISREGARD_INLINE_LIMITS (old_result)
1753 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1754 check_redeclaration_exception_specification (newdecl, olddecl);
1758 /* If the new declaration is a definition, update the file and
1759 line information on the declaration, and also make
1760 the old declaration the same definition. */
1761 if (DECL_INITIAL (new_result) != NULL_TREE)
1763 DECL_SOURCE_LOCATION (olddecl)
1764 = DECL_SOURCE_LOCATION (old_result)
1765 = DECL_SOURCE_LOCATION (newdecl);
1766 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1767 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1770 DECL_ARGUMENTS (old_result)
1771 = DECL_ARGUMENTS (new_result);
1772 for (parm = DECL_ARGUMENTS (old_result); parm;
1773 parm = DECL_CHAIN (parm))
1774 DECL_CONTEXT (parm) = old_result;
1783 /* Automatically handles default parameters. */
1784 tree oldtype = TREE_TYPE (olddecl);
1787 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1788 maybe_instantiate_noexcept (olddecl);
1790 /* Merge the data types specified in the two decls. */
1791 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1793 /* If merge_types produces a non-typedef type, just use the old type. */
1794 if (TREE_CODE (newdecl) == TYPE_DECL
1795 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1798 if (TREE_CODE (newdecl) == VAR_DECL)
1800 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1801 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1802 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1803 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1804 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1805 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1807 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1808 if (DECL_LANG_SPECIFIC (olddecl)
1809 && CP_DECL_THREADPRIVATE_P (olddecl))
1811 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1812 if (!DECL_LANG_SPECIFIC (newdecl))
1813 retrofit_lang_decl (newdecl);
1815 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1816 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1820 /* Do this after calling `merge_types' so that default
1821 parameters don't confuse us. */
1822 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1823 check_redeclaration_exception_specification (newdecl, olddecl);
1824 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1826 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1827 check_default_args (newdecl);
1829 /* Lay the type out, unless already done. */
1830 if (! same_type_p (newtype, oldtype)
1831 && TREE_TYPE (newdecl) != error_mark_node
1832 && !(processing_template_decl && uses_template_parms (newdecl)))
1833 layout_type (TREE_TYPE (newdecl));
1835 if ((TREE_CODE (newdecl) == VAR_DECL
1836 || TREE_CODE (newdecl) == PARM_DECL
1837 || TREE_CODE (newdecl) == RESULT_DECL
1838 || TREE_CODE (newdecl) == FIELD_DECL
1839 || TREE_CODE (newdecl) == TYPE_DECL)
1840 && !(processing_template_decl && uses_template_parms (newdecl)))
1841 layout_decl (newdecl, 0);
1843 /* Merge the type qualifiers. */
1844 if (TREE_READONLY (newdecl))
1845 TREE_READONLY (olddecl) = 1;
1846 if (TREE_THIS_VOLATILE (newdecl))
1847 TREE_THIS_VOLATILE (olddecl) = 1;
1848 if (TREE_NOTHROW (newdecl))
1849 TREE_NOTHROW (olddecl) = 1;
1851 /* Merge deprecatedness. */
1852 if (TREE_DEPRECATED (newdecl))
1853 TREE_DEPRECATED (olddecl) = 1;
1855 /* Preserve function specific target and optimization options */
1856 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1858 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1859 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1860 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1861 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1863 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1864 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1865 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1866 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1869 /* Merge the initialization information. */
1870 if (DECL_INITIAL (newdecl) == NULL_TREE
1871 && DECL_INITIAL (olddecl) != NULL_TREE)
1873 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1874 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1875 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1877 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1878 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1882 /* Merge the section attribute.
1883 We want to issue an error if the sections conflict but that must be
1884 done later in decl_attributes since we are called before attributes
1886 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1887 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1889 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1891 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1892 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1893 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1894 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1895 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1896 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1897 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1898 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1899 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1900 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1901 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1902 /* Keep the old RTL. */
1903 COPY_DECL_RTL (olddecl, newdecl);
1905 else if (TREE_CODE (newdecl) == VAR_DECL
1906 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1908 /* Keep the old RTL. We cannot keep the old RTL if the old
1909 declaration was for an incomplete object and the new
1910 declaration is not since many attributes of the RTL will
1912 COPY_DECL_RTL (olddecl, newdecl);
1915 /* If cannot merge, then use the new type and qualifiers,
1916 and don't preserve the old rtl. */
1919 /* Clean out any memory we had of the old declaration. */
1920 tree oldstatic = value_member (olddecl, static_aggregates);
1922 TREE_VALUE (oldstatic) = error_mark_node;
1924 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1925 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1926 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1927 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1930 /* Merge the storage class information. */
1931 merge_weak (newdecl, olddecl);
1933 if (DECL_ONE_ONLY (olddecl))
1934 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1936 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1937 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1938 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1939 if (! DECL_EXTERNAL (olddecl))
1940 DECL_EXTERNAL (newdecl) = 0;
1942 new_template_info = NULL_TREE;
1943 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1945 bool new_redefines_gnu_inline = false;
1947 if (new_defines_function
1948 && ((DECL_INTERFACE_KNOWN (olddecl)
1949 && TREE_CODE (olddecl) == FUNCTION_DECL)
1950 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1951 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1952 == FUNCTION_DECL))))
1956 if (TREE_CODE (fn) == TEMPLATE_DECL)
1957 fn = DECL_TEMPLATE_RESULT (olddecl);
1959 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1962 if (!new_redefines_gnu_inline)
1964 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1965 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1966 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1968 DECL_TEMPLATE_INSTANTIATED (newdecl)
1969 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1970 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1972 /* If the OLDDECL is an instantiation and/or specialization,
1973 then the NEWDECL must be too. But, it may not yet be marked
1974 as such if the caller has created NEWDECL, but has not yet
1975 figured out that it is a redeclaration. */
1976 if (!DECL_USE_TEMPLATE (newdecl))
1977 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1979 /* Don't really know how much of the language-specific
1980 values we should copy from old to new. */
1981 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1982 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1983 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1984 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1986 if (LANG_DECL_HAS_MIN (newdecl))
1988 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1989 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1990 if (DECL_TEMPLATE_INFO (newdecl))
1991 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1992 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1994 /* Only functions have these fields. */
1995 if (TREE_CODE (newdecl) == FUNCTION_DECL
1996 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1998 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1999 olddecl_friend = DECL_FRIEND_P (olddecl);
2000 hidden_friend = (DECL_ANTICIPATED (olddecl)
2001 && DECL_HIDDEN_FRIEND_P (olddecl)
2002 && newdecl_is_friend);
2003 DECL_BEFRIENDING_CLASSES (newdecl)
2004 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2005 DECL_BEFRIENDING_CLASSES (olddecl));
2006 /* DECL_THUNKS is only valid for virtual functions,
2007 otherwise it is a DECL_FRIEND_CONTEXT. */
2008 if (DECL_VIRTUAL_P (newdecl))
2009 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2011 /* Only variables have this field. */
2012 else if (TREE_CODE (newdecl) == VAR_DECL
2013 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2014 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2017 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2021 /* Merge parameter attributes. */
2022 tree oldarg, newarg;
2023 for (oldarg = DECL_ARGUMENTS(olddecl),
2024 newarg = DECL_ARGUMENTS(newdecl);
2026 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2027 DECL_ATTRIBUTES (newarg)
2028 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2029 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2032 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2033 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2035 /* If newdecl is not a specialization, then it is not a
2036 template-related function at all. And that means that we
2037 should have exited above, returning 0. */
2038 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2040 if (DECL_ODR_USED (olddecl))
2041 /* From [temp.expl.spec]:
2043 If a template, a member template or the member of a class
2044 template is explicitly specialized then that
2045 specialization shall be declared before the first use of
2046 that specialization that would cause an implicit
2047 instantiation to take place, in every translation unit in
2048 which such a use occurs. */
2049 error ("explicit specialization of %qD after first use",
2052 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2054 /* Don't propagate visibility from the template to the
2055 specialization here. We'll do that in determine_visibility if
2057 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2059 /* [temp.expl.spec/14] We don't inline explicit specialization
2060 just because the primary template says so. */
2062 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2063 the always_inline attribute. */
2064 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2065 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2067 if (DECL_DECLARED_INLINE_P (newdecl))
2068 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2070 DECL_ATTRIBUTES (newdecl)
2071 = remove_attribute ("always_inline",
2072 DECL_ATTRIBUTES (newdecl));
2075 else if (new_defines_function && DECL_INITIAL (olddecl))
2077 /* Never inline re-defined extern inline functions.
2078 FIXME: this could be better handled by keeping both
2079 function as separate declarations. */
2080 DECL_UNINLINABLE (newdecl) = 1;
2084 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2085 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2087 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2089 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2090 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2092 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2093 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2094 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2095 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2098 /* Preserve abstractness on cloned [cd]tors. */
2099 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2101 /* Update newdecl's parms to point at olddecl. */
2102 for (parm = DECL_ARGUMENTS (newdecl); parm;
2103 parm = DECL_CHAIN (parm))
2104 DECL_CONTEXT (parm) = olddecl;
2108 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2109 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2110 COPY_DECL_RTL (newdecl, olddecl);
2112 if (! types_match || new_defines_function)
2114 /* These need to be copied so that the names are available.
2115 Note that if the types do match, we'll preserve inline
2116 info and other bits, but if not, we won't. */
2117 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2118 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2120 if (new_defines_function)
2121 /* If defining a function declared with other language
2122 linkage, use the previously declared language linkage. */
2123 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2124 else if (types_match)
2126 /* If redeclaring a builtin function, and not a definition,
2127 it stays built in. */
2128 if (DECL_BUILT_IN (olddecl))
2130 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2131 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2132 /* If we're keeping the built-in definition, keep the rtl,
2133 regardless of declaration matches. */
2134 COPY_DECL_RTL (olddecl, newdecl);
2137 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2138 /* Don't clear out the arguments if we're just redeclaring a
2140 if (DECL_ARGUMENTS (olddecl))
2141 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2144 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2145 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2147 /* Now preserve various other info from the definition. */
2148 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2149 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2150 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2151 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2153 /* Warn about conflicting visibility specifications. */
2154 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2155 && DECL_VISIBILITY_SPECIFIED (newdecl)
2156 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2158 warning_at (input_location, OPT_Wattributes,
2159 "%q+D: visibility attribute ignored because it", newdecl);
2160 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2161 "conflicts with previous declaration here");
2163 /* Choose the declaration which specified visibility. */
2164 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2166 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2167 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2169 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2170 so keep this behavior. */
2171 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2173 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2174 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2176 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2177 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2178 if (TREE_CODE (newdecl) == FIELD_DECL)
2179 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2181 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2182 with that from NEWDECL below. */
2183 if (DECL_LANG_SPECIFIC (olddecl))
2185 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2186 != DECL_LANG_SPECIFIC (newdecl));
2187 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2190 /* Merge the USED information. */
2191 if (TREE_USED (olddecl))
2192 TREE_USED (newdecl) = 1;
2193 else if (TREE_USED (newdecl))
2194 TREE_USED (olddecl) = 1;
2195 if (TREE_CODE (newdecl) == VAR_DECL)
2197 if (DECL_READ_P (olddecl))
2198 DECL_READ_P (newdecl) = 1;
2199 else if (DECL_READ_P (newdecl))
2200 DECL_READ_P (olddecl) = 1;
2202 if (DECL_PRESERVE_P (olddecl))
2203 DECL_PRESERVE_P (newdecl) = 1;
2204 else if (DECL_PRESERVE_P (newdecl))
2205 DECL_PRESERVE_P (olddecl) = 1;
2207 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2211 function_size = sizeof (struct tree_decl_common);
2213 memcpy ((char *) olddecl + sizeof (struct tree_common),
2214 (char *) newdecl + sizeof (struct tree_common),
2215 function_size - sizeof (struct tree_common));
2217 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2218 (char *) newdecl + sizeof (struct tree_decl_common),
2219 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2220 if (new_template_info)
2221 /* If newdecl is a template instantiation, it is possible that
2222 the following sequence of events has occurred:
2224 o A friend function was declared in a class template. The
2225 class template was instantiated.
2227 o The instantiation of the friend declaration was
2228 recorded on the instantiation list, and is newdecl.
2230 o Later, however, instantiate_class_template called pushdecl
2231 on the newdecl to perform name injection. But, pushdecl in
2232 turn called duplicate_decls when it discovered that another
2233 declaration of a global function with the same name already
2236 o Here, in duplicate_decls, we decided to clobber newdecl.
2238 If we're going to do that, we'd better make sure that
2239 olddecl, and not newdecl, is on the list of
2240 instantiations so that if we try to do the instantiation
2241 again we won't get the clobbered declaration. */
2242 reregister_specialization (newdecl,
2248 size_t size = tree_code_size (TREE_CODE (olddecl));
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2252 switch (TREE_CODE (olddecl))
2262 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2263 (char *) newdecl + sizeof (struct tree_decl_common),
2264 size - sizeof (struct tree_decl_common)
2265 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2269 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2270 (char *) newdecl + sizeof (struct tree_decl_common),
2271 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2272 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2276 DECL_UID (olddecl) = olddecl_uid;
2278 DECL_FRIEND_P (olddecl) = 1;
2281 DECL_ANTICIPATED (olddecl) = 1;
2282 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2285 /* NEWDECL contains the merged attribute lists.
2286 Update OLDDECL to be the same. */
2287 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2289 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2290 so that encode_section_info has a chance to look at the new decl
2291 flags and attributes. */
2292 if (DECL_RTL_SET_P (olddecl)
2293 && (TREE_CODE (olddecl) == FUNCTION_DECL
2294 || (TREE_CODE (olddecl) == VAR_DECL
2295 && TREE_STATIC (olddecl))))
2296 make_decl_rtl (olddecl);
2298 /* The NEWDECL will no longer be needed. Because every out-of-class
2299 declaration of a member results in a call to duplicate_decls,
2300 freeing these nodes represents in a significant savings. */
2306 /* Return zero if the declaration NEWDECL is valid
2307 when the declaration OLDDECL (assumed to be for the same name)
2308 has already been seen.
2309 Otherwise return an error message format string with a %s
2310 where the identifier should go. */
2313 redeclaration_error_message (tree newdecl, tree olddecl)
2315 if (TREE_CODE (newdecl) == TYPE_DECL)
2317 /* Because C++ can put things into name space for free,
2318 constructs like "typedef struct foo { ... } foo"
2319 would look like an erroneous redeclaration. */
2320 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2323 return G_("redefinition of %q#D");
2325 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2327 /* If this is a pure function, its olddecl will actually be
2328 the original initialization to `0' (which we force to call
2329 abort()). Don't complain about redefinition in this case. */
2330 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2331 && DECL_INITIAL (olddecl) == NULL_TREE)
2334 /* If both functions come from different namespaces, this is not
2335 a redeclaration - this is a conflict with a used function. */
2336 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2337 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2338 && ! decls_match (olddecl, newdecl))
2339 return G_("%qD conflicts with used function");
2341 /* We'll complain about linkage mismatches in
2342 warn_extern_redeclared_static. */
2344 /* Defining the same name twice is no good. */
2345 if (DECL_INITIAL (olddecl) != NULL_TREE
2346 && DECL_INITIAL (newdecl) != NULL_TREE)
2348 if (DECL_NAME (olddecl) == NULL_TREE)
2349 return G_("%q#D not declared in class");
2350 else if (!GNU_INLINE_P (olddecl)
2351 || GNU_INLINE_P (newdecl))
2352 return G_("redefinition of %q#D");
2355 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2357 bool olda = GNU_INLINE_P (olddecl);
2358 bool newa = GNU_INLINE_P (newdecl);
2363 return G_("%q+D redeclared inline with "
2364 "%<gnu_inline%> attribute");
2366 return G_("%q+D redeclared inline without "
2367 "%<gnu_inline%> attribute");
2373 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2377 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2379 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2380 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2381 return G_("redefinition of %q#D");
2385 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2386 || (DECL_TEMPLATE_RESULT (newdecl)
2387 == DECL_TEMPLATE_RESULT (olddecl)))
2390 nt = DECL_TEMPLATE_RESULT (newdecl);
2391 if (DECL_TEMPLATE_INFO (nt))
2392 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2393 ot = DECL_TEMPLATE_RESULT (olddecl);
2394 if (DECL_TEMPLATE_INFO (ot))
2395 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2396 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2397 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2398 return G_("redefinition of %q#D");
2400 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2402 bool olda = GNU_INLINE_P (ot);
2403 bool newa = GNU_INLINE_P (nt);
2408 return G_("%q+D redeclared inline with "
2409 "%<gnu_inline%> attribute");
2411 return G_("%q+D redeclared inline without "
2412 "%<gnu_inline%> attribute");
2416 /* Core issue #226 (C++0x):
2418 If a friend function template declaration specifies a
2419 default template-argument, that declaration shall be a
2420 definition and shall be the only declaration of the
2421 function template in the translation unit. */
2422 if ((cxx_dialect != cxx98)
2423 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2424 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2425 /*is_primary=*/1, /*is_partial=*/0,
2426 /*is_friend_decl=*/2))
2427 return G_("redeclaration of friend %q#D "
2428 "may not have default template arguments");
2432 else if (TREE_CODE (newdecl) == VAR_DECL
2433 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2434 && (! DECL_LANG_SPECIFIC (olddecl)
2435 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2436 || DECL_THREAD_LOCAL_P (newdecl)))
2438 /* Only variables can be thread-local, and all declarations must
2439 agree on this property. */
2440 if (DECL_THREAD_LOCAL_P (newdecl))
2441 return G_("thread-local declaration of %q#D follows "
2442 "non-thread-local declaration");
2444 return G_("non-thread-local declaration of %q#D follows "
2445 "thread-local declaration");
2447 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2449 /* The objects have been declared at namespace scope. If either
2450 is a member of an anonymous union, then this is an invalid
2451 redeclaration. For example:
2457 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2458 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2459 return G_("redeclaration of %q#D");
2460 /* If at least one declaration is a reference, there is no
2461 conflict. For example:
2467 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2469 /* Reject two definitions. */
2470 return G_("redefinition of %q#D");
2474 /* Objects declared with block scope: */
2475 /* Reject two definitions, and reject a definition
2476 together with an external reference. */
2477 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2478 return G_("redeclaration of %q#D");
2483 /* Hash and equality functions for the named_label table. */
2486 named_label_entry_hash (const void *data)
2488 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2489 return DECL_UID (ent->label_decl);
2493 named_label_entry_eq (const void *a, const void *b)
2495 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2496 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2497 return ent_a->label_decl == ent_b->label_decl;
2500 /* Create a new label, named ID. */
2503 make_label_decl (tree id, int local_p)
2505 struct named_label_entry *ent;
2509 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2511 DECL_CONTEXT (decl) = current_function_decl;
2512 DECL_MODE (decl) = VOIDmode;
2513 C_DECLARED_LABEL_FLAG (decl) = local_p;
2515 /* Say where one reference is to the label, for the sake of the
2516 error if it is not defined. */
2517 DECL_SOURCE_LOCATION (decl) = input_location;
2519 /* Record the fact that this identifier is bound to this label. */
2520 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2522 /* Create the label htab for the function on demand. */
2524 named_labels = htab_create_ggc (13, named_label_entry_hash,
2525 named_label_entry_eq, NULL);
2527 /* Record this label on the list of labels used in this function.
2528 We do this before calling make_label_decl so that we get the
2529 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2530 ent = ggc_alloc_cleared_named_label_entry ();
2531 ent->label_decl = decl;
2533 slot = htab_find_slot (named_labels, ent, INSERT);
2534 gcc_assert (*slot == NULL);
2540 /* Look for a label named ID in the current function. If one cannot
2541 be found, create one. (We keep track of used, but undefined,
2542 labels, and complain about them at the end of a function.) */
2545 lookup_label_1 (tree id)
2549 /* You can't use labels at global scope. */
2550 if (current_function_decl == NULL_TREE)
2552 error ("label %qE referenced outside of any function", id);
2556 /* See if we've already got this label. */
2557 decl = IDENTIFIER_LABEL_VALUE (id);
2558 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2561 decl = make_label_decl (id, /*local_p=*/0);
2565 /* Wrapper for lookup_label_1. */
2568 lookup_label (tree id)
2571 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2572 ret = lookup_label_1 (id);
2573 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2577 /* Declare a local label named ID. */
2580 declare_local_label (tree id)
2583 cp_label_binding *bind;
2585 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2586 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2587 bind = VEC_safe_push (cp_label_binding, gc,
2588 current_binding_level->shadowed_labels, NULL);
2589 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2591 decl = make_label_decl (id, /*local_p=*/1);
2597 /* Returns nonzero if it is ill-formed to jump past the declaration of
2598 DECL. Returns 2 if it's also a real problem. */
2601 decl_jump_unsafe (tree decl)
2603 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2604 with automatic storage duration is not in scope to a point where it is
2605 in scope is ill-formed unless the variable has scalar type, class type
2606 with a trivial default constructor and a trivial destructor, a
2607 cv-qualified version of one of these types, or an array of one of the
2608 preceding types and is declared without an initializer (8.5). */
2609 tree type = TREE_TYPE (decl);
2611 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2612 || type == error_mark_node)
2615 type = strip_array_types (type);
2617 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2618 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2621 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2627 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2630 identify_goto (tree decl, const location_t *locus)
2633 permerror (input_location, "jump to label %qD", decl);
2635 permerror (input_location, "jump to case label");
2637 permerror (*locus, " from here");
2640 /* Check that a single previously seen jump to a newly defined label
2641 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2642 the jump context; NAMES are the names in scope in LEVEL at the jump
2643 context; LOCUS is the source position of the jump or 0. Returns
2644 true if all is well. */
2647 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2648 bool exited_omp, const location_t *locus)
2650 struct cp_binding_level *b;
2651 bool identified = false, saw_eh = false, saw_omp = false;
2655 identify_goto (decl, locus);
2656 error (" exits OpenMP structured block");
2657 identified = saw_omp = true;
2660 for (b = current_binding_level; b ; b = b->level_chain)
2662 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2664 for (new_decls = b->names; new_decls != old_decls;
2665 new_decls = DECL_CHAIN (new_decls))
2667 int problem = decl_jump_unsafe (new_decls);
2673 identify_goto (decl, locus);
2677 error (" crosses initialization of %q+#D", new_decls);
2679 permerror (input_location, " enters scope of %q+#D which has "
2680 "non-trivial destructor", new_decls);
2685 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2689 identify_goto (decl, locus);
2692 if (b->kind == sk_try)
2693 error (" enters try block");
2695 error (" enters catch block");
2698 if (b->kind == sk_omp && !saw_omp)
2702 identify_goto (decl, locus);
2705 error (" enters OpenMP structured block");
2714 check_previous_goto (tree decl, struct named_label_use_entry *use)
2716 check_previous_goto_1 (decl, use->binding_level,
2717 use->names_in_scope, use->in_omp_scope,
2718 &use->o_goto_locus);
2722 check_switch_goto (struct cp_binding_level* level)
2724 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2727 /* Check that a new jump to a label DECL is OK. Called by
2728 finish_goto_stmt. */
2731 check_goto (tree decl)
2733 struct named_label_entry *ent, dummy;
2734 bool saw_catch = false, identified = false;
2738 /* We can't know where a computed goto is jumping.
2739 So we assume that it's OK. */
2740 if (TREE_CODE (decl) != LABEL_DECL)
2743 /* We didn't record any information about this label when we created it,
2744 and there's not much point since it's trivial to analyze as a return. */
2745 if (decl == cdtor_label)
2748 dummy.label_decl = decl;
2749 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2750 gcc_assert (ent != NULL);
2752 /* If the label hasn't been defined yet, defer checking. */
2753 if (! DECL_INITIAL (decl))
2755 struct named_label_use_entry *new_use;
2757 /* Don't bother creating another use if the last goto had the
2758 same data, and will therefore create the same set of errors. */
2760 && ent->uses->names_in_scope == current_binding_level->names)
2763 new_use = ggc_alloc_named_label_use_entry ();
2764 new_use->binding_level = current_binding_level;
2765 new_use->names_in_scope = current_binding_level->names;
2766 new_use->o_goto_locus = input_location;
2767 new_use->in_omp_scope = false;
2769 new_use->next = ent->uses;
2770 ent->uses = new_use;
2774 if (ent->in_try_scope || ent->in_catch_scope
2775 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2777 permerror (input_location, "jump to label %q+D", decl);
2778 permerror (input_location, " from here");
2782 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2784 int u = decl_jump_unsafe (bad);
2786 if (u > 1 && DECL_ARTIFICIAL (bad))
2788 /* Can't skip init of __exception_info. */
2789 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2793 error (" skips initialization of %q+#D", bad);
2795 permerror (input_location, " enters scope of %q+#D which has "
2796 "non-trivial destructor", bad);
2799 if (ent->in_try_scope)
2800 error (" enters try block");
2801 else if (ent->in_catch_scope && !saw_catch)
2802 error (" enters catch block");
2804 if (ent->in_omp_scope)
2805 error (" enters OpenMP structured block");
2806 else if (flag_openmp)
2808 struct cp_binding_level *b;
2809 for (b = current_binding_level; b ; b = b->level_chain)
2811 if (b == ent->binding_level)
2813 if (b->kind == sk_omp)
2817 permerror (input_location, "jump to label %q+D", decl);
2818 permerror (input_location, " from here");
2821 error (" exits OpenMP structured block");
2828 /* Check that a return is ok wrt OpenMP structured blocks.
2829 Called by finish_return_stmt. Returns true if all is well. */
2832 check_omp_return (void)
2834 struct cp_binding_level *b;
2835 for (b = current_binding_level; b ; b = b->level_chain)
2836 if (b->kind == sk_omp)
2838 error ("invalid exit from OpenMP structured block");
2841 else if (b->kind == sk_function_parms)
2846 /* Define a label, specifying the location in the source file.
2847 Return the LABEL_DECL node for the label. */
2850 define_label_1 (location_t location, tree name)
2852 struct named_label_entry *ent, dummy;
2853 struct cp_binding_level *p;
2856 decl = lookup_label (name);
2858 dummy.label_decl = decl;
2859 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2860 gcc_assert (ent != NULL);
2862 /* After labels, make any new cleanups in the function go into their
2863 own new (temporary) binding contour. */
2864 for (p = current_binding_level;
2865 p->kind != sk_function_parms;
2867 p->more_cleanups_ok = 0;
2869 if (name == get_identifier ("wchar_t"))
2870 permerror (input_location, "label named wchar_t");
2872 if (DECL_INITIAL (decl) != NULL_TREE)
2874 error ("duplicate label %qD", decl);
2875 return error_mark_node;
2879 struct named_label_use_entry *use;
2881 /* Mark label as having been defined. */
2882 DECL_INITIAL (decl) = error_mark_node;
2883 /* Say where in the source. */
2884 DECL_SOURCE_LOCATION (decl) = location;
2886 ent->binding_level = current_binding_level;
2887 ent->names_in_scope = current_binding_level->names;
2889 for (use = ent->uses; use ; use = use->next)
2890 check_previous_goto (decl, use);
2897 /* Wrapper for define_label_1. */
2900 define_label (location_t location, tree name)
2903 timevar_start (TV_NAME_LOOKUP);
2904 ret = define_label_1 (location, name);
2905 timevar_stop (TV_NAME_LOOKUP);
2912 struct cp_binding_level *level;
2913 struct cp_switch *next;
2914 /* The SWITCH_STMT being built. */
2916 /* A splay-tree mapping the low element of a case range to the high
2917 element, or NULL_TREE if there is no high element. Used to
2918 determine whether or not a new case label duplicates an old case
2919 label. We need a tree, rather than simply a hash table, because
2920 of the GNU case range extension. */
2924 /* A stack of the currently active switch statements. The innermost
2925 switch statement is on the top of the stack. There is no need to
2926 mark the stack for garbage collection because it is only active
2927 during the processing of the body of a function, and we never
2928 collect at that point. */
2930 static struct cp_switch *switch_stack;
2932 /* Called right after a switch-statement condition is parsed.
2933 SWITCH_STMT is the switch statement being parsed. */
2936 push_switch (tree switch_stmt)
2938 struct cp_switch *p = XNEW (struct cp_switch);
2939 p->level = current_binding_level;
2940 p->next = switch_stack;
2941 p->switch_stmt = switch_stmt;
2942 p->cases = splay_tree_new (case_compare, NULL, NULL);
2949 struct cp_switch *cs = switch_stack;
2950 location_t switch_location;
2952 /* Emit warnings as needed. */
2953 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2954 if (!processing_template_decl)
2955 c_do_switch_warnings (cs->cases, switch_location,
2956 SWITCH_STMT_TYPE (cs->switch_stmt),
2957 SWITCH_STMT_COND (cs->switch_stmt));
2959 splay_tree_delete (cs->cases);
2960 switch_stack = switch_stack->next;
2964 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2965 condition. Note that if TYPE and VALUE are already integral we don't
2966 really do the conversion because the language-independent
2967 warning/optimization code will work better that way. */
2970 case_conversion (tree type, tree value)
2972 if (value == NULL_TREE)
2975 if (cxx_dialect >= cxx0x
2976 && (SCOPED_ENUM_P (type)
2977 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2979 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2980 type = type_promotes_to (type);
2981 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2983 return cxx_constant_value (value);
2986 /* Note that we've seen a definition of a case label, and complain if this
2987 is a bad place for one. */
2990 finish_case_label (location_t loc, tree low_value, tree high_value)
2993 struct cp_binding_level *p;
2996 if (processing_template_decl)
3000 /* For templates, just add the case label; we'll do semantic
3001 analysis at instantiation-time. */
3002 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3003 return add_stmt (build_case_label (low_value, high_value, label));
3006 /* Find the condition on which this switch statement depends. */
3007 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3008 if (cond && TREE_CODE (cond) == TREE_LIST)
3009 cond = TREE_VALUE (cond);
3011 if (!check_switch_goto (switch_stack->level))
3012 return error_mark_node;
3014 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3016 low_value = case_conversion (type, low_value);
3017 high_value = case_conversion (type, high_value);
3019 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3020 low_value, high_value);
3022 /* After labels, make any new cleanups in the function go into their
3023 own new (temporary) binding contour. */
3024 for (p = current_binding_level;
3025 p->kind != sk_function_parms;
3027 p->more_cleanups_ok = 0;
3032 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3035 typename_hash (const void* k)
3038 const_tree const t = (const_tree) k;
3040 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3041 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3046 typedef struct typename_info {
3054 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3055 really of type `typename_info*' */
3058 typename_compare (const void * k1, const void * k2)
3060 const_tree const t1 = (const_tree) k1;
3061 const typename_info *const t2 = (const typename_info *) k2;
3063 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3064 && TYPE_CONTEXT (t1) == t2->scope
3065 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3066 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3067 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3070 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3071 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3073 Returns the new TYPENAME_TYPE. */
3075 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3078 build_typename_type (tree context, tree name, tree fullname,
3079 enum tag_types tag_type)
3087 if (typename_htab == NULL)
3088 typename_htab = htab_create_ggc (61, &typename_hash,
3089 &typename_compare, NULL);
3091 ti.scope = FROB_CONTEXT (context);
3093 ti.template_id = fullname;
3094 ti.enum_p = tag_type == enum_type;
3095 ti.class_p = (tag_type == class_type
3096 || tag_type == record_type
3097 || tag_type == union_type);
3098 hash = (htab_hash_pointer (ti.scope)
3099 ^ htab_hash_pointer (ti.name));
3101 /* See if we already have this type. */
3102 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3107 /* Build the TYPENAME_TYPE. */
3108 t = cxx_make_type (TYPENAME_TYPE);
3109 TYPE_CONTEXT (t) = ti.scope;
3110 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3111 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3112 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3114 /* Build the corresponding TYPE_DECL. */
3115 d = build_decl (input_location, TYPE_DECL, name, t);
3116 TYPE_NAME (TREE_TYPE (d)) = d;
3117 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3118 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3119 DECL_ARTIFICIAL (d) = 1;
3121 /* Store it in the hash table. */
3124 /* TYPENAME_TYPEs must always be compared structurally, because
3125 they may or may not resolve down to another type depending on
3126 the currently open classes. */
3127 SET_TYPE_STRUCTURAL_EQUALITY (t);
3133 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3134 provided to name the type. Returns an appropriate type, unless an
3135 error occurs, in which case error_mark_node is returned. If we
3136 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3137 return that, rather than the _TYPE it corresponds to, in other
3138 cases we look through the type decl. If TF_ERROR is set, complain
3139 about errors, otherwise be quiet. */
3142 make_typename_type (tree context, tree name, enum tag_types tag_type,
3143 tsubst_flags_t complain)
3149 if (name == error_mark_node
3150 || context == NULL_TREE
3151 || context == error_mark_node)
3152 return error_mark_node;
3156 if (!(TYPE_LANG_SPECIFIC (name)
3157 && (CLASSTYPE_IS_TEMPLATE (name)
3158 || CLASSTYPE_USE_TEMPLATE (name))))
3159 name = TYPE_IDENTIFIER (name);
3161 /* Create a TEMPLATE_ID_EXPR for the type. */
3162 name = build_nt (TEMPLATE_ID_EXPR,
3163 CLASSTYPE_TI_TEMPLATE (name),
3164 CLASSTYPE_TI_ARGS (name));
3166 else if (TREE_CODE (name) == TYPE_DECL)
3167 name = DECL_NAME (name);
3171 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3173 name = TREE_OPERAND (name, 0);
3174 if (TREE_CODE (name) == TEMPLATE_DECL)
3175 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3176 else if (TREE_CODE (name) == OVERLOAD)
3178 error ("%qD is not a type", name);
3179 return error_mark_node;
3182 if (TREE_CODE (name) == TEMPLATE_DECL)
3184 error ("%qD used without template parameters", name);
3185 return error_mark_node;
3187 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3188 gcc_assert (TYPE_P (context));
3190 if (!MAYBE_CLASS_TYPE_P (context))
3192 if (complain & tf_error)
3193 error ("%q#T is not a class", context);
3194 return error_mark_node;
3197 /* When the CONTEXT is a dependent type, NAME could refer to a
3198 dependent base class of CONTEXT. But look inside it anyway
3199 if CONTEXT is a currently open scope, in case it refers to a
3200 member of the current instantiation or a non-dependent base;
3201 lookup will stop when we hit a dependent base. */
3202 if (!dependent_scope_p (context))
3203 /* We should only set WANT_TYPE when we're a nested typename type.
3204 Then we can give better diagnostics if we find a non-type. */
3205 t = lookup_field (context, name, 2, /*want_type=*/true);
3209 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3210 return build_typename_type (context, name, fullname, tag_type);
3212 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3216 if (complain & tf_error)
3217 error (want_template ? "no class template named %q#T in %q#T"
3218 : "no type named %q#T in %q#T", name, context);
3219 return error_mark_node;
3222 /* Pull out the template from an injected-class-name (or multiple). */
3224 t = maybe_get_template_decl_from_type_decl (t);
3226 if (TREE_CODE (t) == TREE_LIST)
3228 if (complain & tf_error)
3230 error ("lookup of %qT in %qT is ambiguous", name, context);
3231 print_candidates (t);
3233 return error_mark_node;
3236 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3238 if (complain & tf_error)
3239 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3241 return error_mark_node;
3243 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3245 if (complain & tf_error)
3246 error ("%<typename %T::%D%> names %q#T, which is not a type",
3248 return error_mark_node;
3251 if (complain & tf_error)
3252 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3254 /* If we are currently parsing a template and if T is a typedef accessed
3255 through CONTEXT then we need to remember and check access of T at
3256 template instantiation time. */
3257 add_typedef_to_current_template_for_access_check (t, context, input_location);
3260 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3262 /*entering_scope=*/0,
3263 tf_warning_or_error | tf_user);
3265 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3271 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3272 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3273 in which case error_mark_node is returned.
3275 If PARM_LIST is non-NULL, also make sure that the template parameter
3276 list of TEMPLATE_DECL matches.
3278 If COMPLAIN zero, don't complain about any errors that occur. */
3281 make_unbound_class_template (tree context, tree name, tree parm_list,
3282 tsubst_flags_t complain)
3288 name = TYPE_IDENTIFIER (name);
3289 else if (DECL_P (name))
3290 name = DECL_NAME (name);
3291 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3293 if (!dependent_type_p (context)
3294 || currently_open_class (context))
3296 tree tmpl = NULL_TREE;
3298 if (MAYBE_CLASS_TYPE_P (context))
3299 tmpl = lookup_field (context, name, 0, false);
3301 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3302 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3304 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3306 if (complain & tf_error)
3307 error ("no class template named %q#T in %q#T", name, context);
3308 return error_mark_node;
3312 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3314 if (complain & tf_error)
3316 error ("template parameters do not match template");
3317 error ("%q+D declared here", tmpl);
3319 return error_mark_node;
3322 if (complain & tf_error)
3323 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3328 /* Build the UNBOUND_CLASS_TEMPLATE. */
3329 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3330 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3331 TREE_TYPE (t) = NULL_TREE;
3332 SET_TYPE_STRUCTURAL_EQUALITY (t);
3334 /* Build the corresponding TEMPLATE_DECL. */
3335 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3336 TYPE_NAME (TREE_TYPE (d)) = d;
3337 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3338 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3339 DECL_ARTIFICIAL (d) = 1;
3340 DECL_TEMPLATE_PARMS (d) = parm_list;
3347 /* Push the declarations of builtin types into the namespace.
3348 RID_INDEX is the index of the builtin type in the array
3349 RID_POINTERS. NAME is the name used when looking up the builtin
3350 type. TYPE is the _TYPE node for the builtin type. */
3353 record_builtin_type (enum rid rid_index,
3357 tree rname = NULL_TREE, tname = NULL_TREE;
3358 tree tdecl = NULL_TREE;
3360 if ((int) rid_index < (int) RID_MAX)
3361 rname = ridpointers[(int) rid_index];
3363 tname = get_identifier (name);
3365 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3366 eliminated. Built-in types should not be looked up name; their
3367 names are keywords that the parser can recognize. However, there
3368 is code in c-common.c that uses identifier_global_value to look
3369 up built-in types by name. */
3372 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3373 DECL_ARTIFICIAL (tdecl) = 1;
3374 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3380 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3381 DECL_ARTIFICIAL (tdecl) = 1;
3383 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3386 if (!TYPE_NAME (type))
3387 TYPE_NAME (type) = tdecl;
3390 debug_hooks->type_decl (tdecl, 0);
3393 /* Record one of the standard Java types.
3394 * Declare it as having the given NAME.
3395 * If SIZE > 0, it is the size of one of the integral types;
3396 * otherwise it is the negative of the size of one of the other types. */
3399 record_builtin_java_type (const char* name, int size)
3404 type = build_nonstandard_integer_type (size, 0);
3405 type = build_distinct_type_copy (type);
3407 else if (size > -32)
3410 /* "__java_char" or ""__java_boolean". */
3411 type = build_nonstandard_integer_type (-size, 1);
3412 type = build_distinct_type_copy (type);
3413 /* Get the signed type cached and attached to the unsigned type,
3414 so it doesn't get garbage-collected at "random" times,
3415 causing potential codegen differences out of different UIDs
3416 and different alias set numbers. */
3417 stype = build_nonstandard_integer_type (-size, 0);
3418 stype = build_distinct_type_copy (stype);
3419 TREE_CHAIN (type) = stype;
3420 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3423 { /* "__java_float" or ""__java_double". */
3424 type = make_node (REAL_TYPE);
3425 TYPE_PRECISION (type) = - size;
3428 record_builtin_type (RID_MAX, name, type);
3429 decl = TYPE_NAME (type);
3431 /* Suppress generate debug symbol entries for these types,
3432 since for normal C++ they are just clutter.
3433 However, push_lang_context undoes this if extern "Java" is seen. */
3434 DECL_IGNORED_P (decl) = 1;
3436 TYPE_FOR_JAVA (type) = 1;
3440 /* Push a type into the namespace so that the back ends ignore it. */
3443 record_unknown_type (tree type, const char* name)
3445 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3446 TYPE_DECL, get_identifier (name), type));
3447 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3448 DECL_IGNORED_P (decl) = 1;
3449 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3450 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3451 TYPE_ALIGN (type) = 1;
3452 TYPE_USER_ALIGN (type) = 0;
3453 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3456 /* A string for which we should create an IDENTIFIER_NODE at
3459 typedef struct predefined_identifier
3461 /* The name of the identifier. */
3462 const char *const name;
3463 /* The place where the IDENTIFIER_NODE should be stored. */
3465 /* Nonzero if this is the name of a constructor or destructor. */
3466 const int ctor_or_dtor_p;
3467 } predefined_identifier;
3469 /* Create all the predefined identifiers. */
3472 initialize_predefined_identifiers (void)
3474 const predefined_identifier *pid;
3476 /* A table of identifiers to create at startup. */
3477 static const predefined_identifier predefined_identifiers[] = {
3478 { "C++", &lang_name_cplusplus, 0 },
3479 { "C", &lang_name_c, 0 },
3480 { "Java", &lang_name_java, 0 },
3481 /* Some of these names have a trailing space so that it is
3482 impossible for them to conflict with names written by users. */
3483 { "__ct ", &ctor_identifier, 1 },
3484 { "__base_ctor ", &base_ctor_identifier, 1 },
3485 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3486 { "__dt ", &dtor_identifier, 1 },
3487 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3488 { "__base_dtor ", &base_dtor_identifier, 1 },
3489 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3490 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3491 { "nelts", &nelts_identifier, 0 },
3492 { THIS_NAME, &this_identifier, 0 },
3493 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3494 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3495 { "_vptr", &vptr_identifier, 0 },
3496 { "__vtt_parm", &vtt_parm_identifier, 0 },
3497 { "::", &global_scope_name, 0 },
3498 { "std", &std_identifier, 0 },
3502 for (pid = predefined_identifiers; pid->name; ++pid)
3504 *pid->node = get_identifier (pid->name);
3505 if (pid->ctor_or_dtor_p)
3506 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3510 /* Create the predefined scalar types of C,
3511 and some nodes representing standard constants (0, 1, (void *)0).
3512 Initialize the global binding level.
3513 Make definitions for built-in primitive functions. */
3516 cxx_init_decl_processing (void)
3519 tree void_ftype_ptr;
3521 build_common_tree_nodes (flag_signed_char);
3523 /* Create all the identifiers we need. */
3524 initialize_predefined_identifiers ();
3526 /* Create the global variables. */
3527 push_to_top_level ();
3529 current_function_decl = NULL_TREE;
3530 current_binding_level = NULL;
3531 /* Enter the global namespace. */
3532 gcc_assert (global_namespace == NULL_TREE);
3533 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3535 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3536 TREE_PUBLIC (global_namespace) = 1;
3537 begin_scope (sk_namespace, global_namespace);
3539 current_lang_name = NULL_TREE;
3541 if (flag_visibility_ms_compat)
3542 default_visibility = VISIBILITY_HIDDEN;
3545 current_lang_name = lang_name_c;
3547 /* Create the `std' namespace. */
3548 push_namespace (std_identifier);
3549 std_node = current_namespace;
3552 c_common_nodes_and_builtins ();
3554 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3555 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3556 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3557 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3558 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3559 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3560 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3561 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3563 integer_two_node = build_int_cst (NULL_TREE, 2);
3565 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3566 truthvalue_type_node = boolean_type_node;
3567 truthvalue_false_node = boolean_false_node;
3568 truthvalue_true_node = boolean_true_node;
3570 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3571 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3572 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3575 record_builtin_type (RID_MAX, NULL, string_type_node);
3578 delta_type_node = ptrdiff_type_node;
3579 vtable_index_type = ptrdiff_type_node;
3581 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3582 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3583 void_ftype_ptr = build_function_type_list (void_type_node,
3584 ptr_type_node, NULL_TREE);
3586 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3588 /* C++ extensions */
3590 unknown_type_node = make_node (LANG_TYPE);
3591 record_unknown_type (unknown_type_node, "unknown type");
3593 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3594 TREE_TYPE (unknown_type_node) = unknown_type_node;
3596 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3598 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3599 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3601 init_list_type_node = make_node (LANG_TYPE);
3602 record_unknown_type (init_list_type_node, "init list");
3605 /* Make sure we get a unique function type, so we can give
3606 its pointer type a name. (This wins for gdb.) */
3607 tree vfunc_type = make_node (FUNCTION_TYPE);
3608 TREE_TYPE (vfunc_type) = integer_type_node;
3609 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3610 layout_type (vfunc_type);
3612 vtable_entry_type = build_pointer_type (vfunc_type);
3614 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3617 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3618 layout_type (vtbl_type_node);
3619 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3620 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3621 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3622 layout_type (vtbl_ptr_type_node);
3623 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3625 push_namespace (get_identifier ("__cxxabiv1"));
3626 abi_node = current_namespace;
3629 global_type_node = make_node (LANG_TYPE);
3630 record_unknown_type (global_type_node, "global type");
3633 current_lang_name = lang_name_cplusplus;
3636 tree newtype, deltype;
3637 tree ptr_ftype_sizetype;
3641 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3642 if (cxx_dialect == cxx98)
3645 tree bad_alloc_type_node;
3646 tree bad_alloc_decl;
3648 push_namespace (std_identifier);
3649 bad_alloc_id = get_identifier ("bad_alloc");
3650 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3651 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3653 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3654 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3658 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3661 new_eh_spec = noexcept_false_spec;
3663 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3664 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3665 push_cp_library_fn (NEW_EXPR, newtype);
3666 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3667 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3668 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3670 nullptr_type_node = make_node (NULLPTR_TYPE);
3671 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3672 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3673 TYPE_UNSIGNED (nullptr_type_node) = 1;
3674 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3675 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3676 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3677 nullptr_node = build_int_cst (nullptr_type_node, 0);
3681 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3683 /* Perform other language dependent initializations. */
3684 init_class_processing ();
3685 init_rtti_processing ();
3686 init_template_processing ();
3688 if (flag_exceptions)
3689 init_exception_processing ();
3691 if (! supports_one_only ())
3694 make_fname_decl = cp_make_fname_decl;
3695 start_fname_decls ();
3697 /* Show we use EH for cleanups. */
3698 if (flag_exceptions)
3699 using_eh_for_cleanups ();
3702 /* Generate an initializer for a function naming variable from
3703 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3704 filled in with the type of the init. */
3707 cp_fname_init (const char* name, tree *type_p)
3709 tree domain = NULL_TREE;
3711 tree init = NULL_TREE;
3716 length = strlen (name);
3717 domain = build_index_type (size_int (length));
3718 init = build_string (length + 1, name);
3721 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3722 type = build_cplus_array_type (type, domain);
3727 TREE_TYPE (init) = type;
3729 init = error_mark_node;
3734 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3735 the decl, LOC is the location to give the decl, NAME is the
3736 initialization string and TYPE_DEP indicates whether NAME depended
3737 on the type of the function. We make use of that to detect
3738 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3739 at the point of first use, so we mustn't push the decl now. */
3742 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3744 const char *const name = (type_dep && processing_template_decl
3745 ? NULL : fname_as_string (type_dep));
3747 tree init = cp_fname_init (name, &type);
3748 tree decl = build_decl (loc, VAR_DECL, id, type);
3751 free (CONST_CAST (char *, name));
3753 /* As we're using pushdecl_with_scope, we must set the context. */
3754 DECL_CONTEXT (decl) = current_function_decl;
3755 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3757 TREE_STATIC (decl) = 1;
3758 TREE_READONLY (decl) = 1;
3759 DECL_ARTIFICIAL (decl) = 1;
3761 TREE_USED (decl) = 1;
3763 if (current_function_decl)
3765 struct cp_binding_level *b = current_binding_level;
3766 if (b->kind == sk_function_parms)
3767 return error_mark_node;
3768 while (b->level_chain->kind != sk_function_parms)
3770 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3771 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3772 LOOKUP_ONLYCONVERTING);
3776 DECL_THIS_STATIC (decl) = true;
3777 pushdecl_top_level_and_finish (decl, init);
3784 builtin_function_1 (tree decl, tree context, bool is_global)
3786 tree id = DECL_NAME (decl);
3787 const char *name = IDENTIFIER_POINTER (id);
3789 retrofit_lang_decl (decl);
3791 DECL_ARTIFICIAL (decl) = 1;
3792 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3793 SET_DECL_LANGUAGE (decl, lang_c);
3794 /* Runtime library routines are, by definition, available in an
3795 external shared object. */
3796 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3797 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3799 DECL_CONTEXT (decl) = context;
3802 pushdecl_top_level (decl);
3806 /* A function in the user's namespace should have an explicit
3807 declaration before it is used. Mark the built-in function as
3808 anticipated but not actually declared. */
3809 if (name[0] != '_' || name[1] != '_')
3810 DECL_ANTICIPATED (decl) = 1;
3811 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3813 size_t len = strlen (name);
3815 /* Treat __*_chk fortification functions as anticipated as well,
3816 unless they are __builtin_*. */
3817 if (len > strlen ("___chk")
3818 && memcmp (name + len - strlen ("_chk"),
3819 "_chk", strlen ("_chk") + 1) == 0)
3820 DECL_ANTICIPATED (decl) = 1;
3827 cxx_builtin_function (tree decl)
3829 tree id = DECL_NAME (decl);
3830 const char *name = IDENTIFIER_POINTER (id);
3831 /* All builtins that don't begin with an '_' should additionally
3832 go in the 'std' namespace. */
3835 tree decl2 = copy_node(decl);
3836 push_namespace (std_identifier);
3837 builtin_function_1 (decl2, std_node, false);
3841 return builtin_function_1 (decl, NULL_TREE, false);
3844 /* Like cxx_builtin_function, but guarantee the function is added to the global
3845 scope. This is to allow function specific options to add new machine
3846 dependent builtins when the target ISA changes via attribute((target(...)))
3847 which saves space on program startup if the program does not use non-generic
3851 cxx_builtin_function_ext_scope (tree decl)
3854 tree id = DECL_NAME (decl);
3855 const char *name = IDENTIFIER_POINTER (id);
3856 /* All builtins that don't begin with an '_' should additionally
3857 go in the 'std' namespace. */
3860 tree decl2 = copy_node(decl);
3861 push_namespace (std_identifier);
3862 builtin_function_1 (decl2, std_node, true);
3866 return builtin_function_1 (decl, NULL_TREE, true);
3869 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3870 function. Not called directly. */
3873 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3875 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3876 DECL_EXTERNAL (fn) = 1;
3877 TREE_PUBLIC (fn) = 1;
3878 DECL_ARTIFICIAL (fn) = 1;
3879 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3880 SET_DECL_LANGUAGE (fn, lang_c);
3881 /* Runtime library routines are, by definition, available in an
3882 external shared object. */
3883 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3884 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3888 /* Returns the _DECL for a library function with C linkage.
3889 We assume that such functions never throw; if this is incorrect,
3890 callers should unset TREE_NOTHROW. */
3893 build_library_fn (tree name, tree type)
3895 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3896 TREE_NOTHROW (fn) = 1;
3900 /* Returns the _DECL for a library function with C++ linkage. */
3903 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3905 tree fn = build_library_fn_1 (name, operator_code, type);
3906 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3907 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3908 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3912 /* Like build_library_fn, but takes a C string instead of an
3916 build_library_fn_ptr (const char* name, tree type)
3918 return build_library_fn (get_identifier (name), type);
3921 /* Like build_cp_library_fn, but takes a C string instead of an
3925 build_cp_library_fn_ptr (const char* name, tree type)
3927 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3930 /* Like build_library_fn, but also pushes the function so that we will
3931 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3932 may throw exceptions listed in RAISES. */
3935 push_library_fn (tree name, tree type, tree raises)
3940 type = build_exception_variant (type, raises);
3942 fn = build_library_fn (name, type);
3943 pushdecl_top_level (fn);
3947 /* Like build_cp_library_fn, but also pushes the function so that it
3948 will be found by normal lookup. */
3951 push_cp_library_fn (enum tree_code operator_code, tree type)
3953 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3960 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3964 push_void_library_fn (tree name, tree parmtypes)
3966 tree type = build_function_type (void_type_node, parmtypes);
3967 return push_library_fn (name, type, NULL_TREE);
3970 /* Like push_library_fn, but also note that this function throws
3971 and does not return. Used for __throw_foo and the like. */
3974 push_throw_library_fn (tree name, tree type)
3976 tree fn = push_library_fn (name, type, NULL_TREE);
3977 TREE_THIS_VOLATILE (fn) = 1;
3978 TREE_NOTHROW (fn) = 0;
3982 /* When we call finish_struct for an anonymous union, we create
3983 default copy constructors and such. But, an anonymous union
3984 shouldn't have such things; this function undoes the damage to the
3985 anonymous union type T.
3987 (The reason that we create the synthesized methods is that we don't
3988 distinguish `union { int i; }' from `typedef union { int i; } U'.
3989 The first is an anonymous union; the second is just an ordinary
3993 fixup_anonymous_aggr (tree t)
3997 /* Wipe out memory of synthesized methods. */
3998 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3999 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4000 TYPE_HAS_COPY_CTOR (t) = 0;
4001 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4002 TYPE_HAS_COPY_ASSIGN (t) = 0;
4003 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4005 /* Splice the implicitly generated functions out of the TYPE_METHODS
4007 q = &TYPE_METHODS (t);
4010 if (DECL_ARTIFICIAL (*q))
4011 *q = TREE_CHAIN (*q);
4013 q = &DECL_CHAIN (*q);
4016 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4017 if (TYPE_METHODS (t))
4019 tree decl = TYPE_MAIN_DECL (t);
4021 if (TREE_CODE (t) != UNION_TYPE)
4022 error_at (DECL_SOURCE_LOCATION (decl),
4023 "an anonymous struct cannot have function members");
4025 error_at (DECL_SOURCE_LOCATION (decl),
4026 "an anonymous union cannot have function members");
4029 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4030 assignment operators (because they cannot have these methods themselves).
4031 For anonymous unions this is already checked because they are not allowed
4032 in any union, otherwise we have to check it. */
4033 if (TREE_CODE (t) != UNION_TYPE)
4037 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4038 if (TREE_CODE (field) == FIELD_DECL)
4040 type = TREE_TYPE (field);
4041 if (CLASS_TYPE_P (type))
4043 if (TYPE_NEEDS_CONSTRUCTING (type))
4044 error ("member %q+#D with constructor not allowed "
4045 "in anonymous aggregate", field);
4046 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4047 error ("member %q+#D with destructor not allowed "
4048 "in anonymous aggregate", field);
4049 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4050 error ("member %q+#D with copy assignment operator "
4051 "not allowed in anonymous aggregate", field);
4057 /* Make sure that a declaration with no declarator is well-formed, i.e.
4058 just declares a tagged type or anonymous union.
4060 Returns the type declared; or NULL_TREE if none. */
4063 check_tag_decl (cp_decl_specifier_seq *declspecs)
4065 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4066 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4067 /* If a class, struct, or enum type is declared by the DECLSPECS
4068 (i.e, if a class-specifier, enum-specifier, or non-typename
4069 elaborated-type-specifier appears in the DECLSPECS),
4070 DECLARED_TYPE is set to the corresponding type. */
4071 tree declared_type = NULL_TREE;
4072 bool error_p = false;
4074 if (declspecs->multiple_types_p)
4075 error ("multiple types in one declaration");
4076 else if (declspecs->redefined_builtin_type)
4078 if (!in_system_header)
4079 permerror (input_location, "redeclaration of C++ built-in type %qT",
4080 declspecs->redefined_builtin_type);
4085 && TYPE_P (declspecs->type)
4086 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4087 && MAYBE_CLASS_TYPE_P (declspecs->type))
4088 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4089 declared_type = declspecs->type;
4090 else if (declspecs->type == error_mark_node)
4092 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4093 permerror (input_location, "declaration does not declare anything");
4094 /* Check for an anonymous union. */
4095 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4096 && TYPE_ANONYMOUS_P (declared_type))
4098 /* 7/3 In a simple-declaration, the optional init-declarator-list
4099 can be omitted only when declaring a class (clause 9) or
4100 enumeration (7.2), that is, when the decl-specifier-seq contains
4101 either a class-specifier, an elaborated-type-specifier with
4102 a class-key (9.1), or an enum-specifier. In these cases and
4103 whenever a class-specifier or enum-specifier is present in the
4104 decl-specifier-seq, the identifiers in these specifiers are among
4105 the names being declared by the declaration (as class-name,
4106 enum-names, or enumerators, depending on the syntax). In such
4107 cases, and except for the declaration of an unnamed bit-field (9.6),
4108 the decl-specifier-seq shall introduce one or more names into the
4109 program, or shall redeclare a name introduced by a previous
4110 declaration. [Example:
4111 enum { }; // ill-formed
4112 typedef class { }; // ill-formed
4116 error ("missing type-name in typedef-declaration");
4119 /* Anonymous unions are objects, so they can have specifiers. */;
4120 SET_ANON_AGGR_TYPE_P (declared_type);
4122 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4123 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4128 if (declspecs->specs[(int)ds_inline]
4129 || declspecs->specs[(int)ds_virtual])
4130 error ("%qs can only be specified for functions",
4131 declspecs->specs[(int)ds_inline]
4132 ? "inline" : "virtual");
4134 && (!current_class_type
4135 || current_scope () != current_class_type))
4136 error ("%<friend%> can only be specified inside a class");
4137 else if (declspecs->specs[(int)ds_explicit])
4138 error ("%<explicit%> can only be specified for constructors");
4139 else if (declspecs->storage_class)
4140 error ("a storage class can only be specified for objects "
4142 else if (declspecs->specs[(int)ds_const]
4143 || declspecs->specs[(int)ds_volatile]
4144 || declspecs->specs[(int)ds_restrict]
4145 || declspecs->specs[(int)ds_thread])
4146 error ("qualifiers can only be specified for objects "
4148 else if (saw_typedef)
4149 warning (0, "%<typedef%> was ignored in this declaration");
4150 else if (declspecs->specs[(int) ds_constexpr])
4151 error ("%<constexpr%> cannot be used for type declarations");
4154 return declared_type;
4157 /* Called when a declaration is seen that contains no names to declare.
4158 If its type is a reference to a structure, union or enum inherited
4159 from a containing scope, shadow that tag name for the current scope
4160 with a forward reference.
4161 If its type defines a new named structure or union
4162 or defines an enum, it is valid but we need not do anything here.
4163 Otherwise, it is an error.
4165 C++: may have to grok the declspecs to learn about static,
4166 complain for anonymous unions.
4168 Returns the TYPE declared -- or NULL_TREE if none. */
4171 shadow_tag (cp_decl_specifier_seq *declspecs)
4173 tree t = check_tag_decl (declspecs);
4178 if (declspecs->attributes)
4180 warning (0, "attribute ignored in declaration of %q+#T", t);
4181 warning (0, "attribute for %q+#T must follow the %qs keyword",
4182 t, class_key_or_enum_as_string (t));
4186 if (maybe_process_partial_specialization (t) == error_mark_node)
4189 /* This is where the variables in an anonymous union are
4190 declared. An anonymous union declaration looks like:
4192 because there is no declarator after the union, the parser
4193 sends that declaration here. */
4194 if (ANON_AGGR_TYPE_P (t))
4196 fixup_anonymous_aggr (t);
4198 if (TYPE_FIELDS (t))
4200 tree decl = grokdeclarator (/*declarator=*/NULL,
4201 declspecs, NORMAL, 0, NULL);
4202 finish_anon_union (decl);
4209 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4212 groktypename (cp_decl_specifier_seq *type_specifiers,
4213 const cp_declarator *declarator,
4214 bool is_template_arg)
4218 enum decl_context context
4219 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4220 attrs = type_specifiers->attributes;
4221 type_specifiers->attributes = NULL_TREE;
4222 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4223 if (attrs && type != error_mark_node)
4225 if (CLASS_TYPE_P (type))
4226 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4227 "outside of definition", type);
4228 else if (MAYBE_CLASS_TYPE_P (type))
4229 /* A template type parameter or other dependent type. */
4230 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4231 "type %qT without an associated declaration", type);
4233 cplus_decl_attributes (&type, attrs, 0);
4238 /* Process a DECLARATOR for a function-scope variable declaration,
4239 namespace-scope variable declaration, or function declaration.
4240 (Function definitions go through start_function; class member
4241 declarations appearing in the body of the class go through
4242 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4243 If an error occurs, the error_mark_node is returned instead.
4245 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4246 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4247 for an explicitly defaulted function, or SD_DELETED for an explicitly
4248 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4249 implicitly initialized via a default constructor. ATTRIBUTES and
4250 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4251 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4252 set, the caller is responsible for calling pop_scope. */
4255 start_decl (const cp_declarator *declarator,
4256 cp_decl_specifier_seq *declspecs,
4259 tree prefix_attributes,
4260 tree *pushed_scope_p)
4268 *pushed_scope_p = NULL_TREE;
4270 /* An object declared as __attribute__((deprecated)) suppresses
4271 warnings of uses of other deprecated items. */
4272 if (lookup_attribute ("deprecated", attributes))
4273 deprecated_state = DEPRECATED_SUPPRESS;
4275 attributes = chainon (attributes, prefix_attributes);
4277 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4280 deprecated_state = DEPRECATED_NORMAL;
4282 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4283 || decl == error_mark_node)
4284 return error_mark_node;
4286 context = CP_DECL_CONTEXT (decl);
4287 if (context != global_namespace)
4288 *pushed_scope_p = push_scope (context);
4291 /* Is it valid for this decl to have an initializer at all?
4292 If not, set INITIALIZED to zero, which will indirectly
4293 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4294 switch (TREE_CODE (decl))
4297 error ("typedef %qD is initialized (use decltype instead)", decl);
4298 return error_mark_node;
4301 if (initialized == SD_DELETED)
4302 /* We'll handle the rest of the semantics later, but we need to
4303 set this now so it's visible to duplicate_decls. */
4304 DECL_DELETED_FN (decl) = 1;
4313 if (! toplevel_bindings_p ()
4314 && DECL_EXTERNAL (decl))
4315 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4317 DECL_EXTERNAL (decl) = 0;
4318 if (toplevel_bindings_p ())
4319 TREE_STATIC (decl) = 1;
4321 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4323 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4324 record_key_method_defined (decl);
4326 /* If this is a typedef that names the class for linkage purposes
4327 (7.1.3p8), apply any attributes directly to the type. */
4328 if (TREE_CODE (decl) == TYPE_DECL
4329 && TAGGED_TYPE_P (TREE_TYPE (decl))
4330 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4331 flags = ATTR_FLAG_TYPE_IN_PLACE;
4335 /* Set attributes here so if duplicate decl, will have proper attributes. */
4336 cplus_decl_attributes (&decl, attributes, flags);
4338 /* Dllimported symbols cannot be defined. Static data members (which
4339 can be initialized in-class and dllimported) go through grokfield,
4340 not here, so we don't need to exclude those decls when checking for
4342 if (initialized && DECL_DLLIMPORT_P (decl))
4344 error ("definition of %q#D is marked %<dllimport%>", decl);
4345 DECL_DLLIMPORT_P (decl) = 0;
4348 /* If #pragma weak was used, mark the decl weak now. */
4349 maybe_apply_pragma_weak (decl);
4351 if (TREE_CODE (decl) == FUNCTION_DECL
4352 && DECL_DECLARED_INLINE_P (decl)
4353 && DECL_UNINLINABLE (decl)
4354 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4355 warning (0, "inline function %q+D given attribute noinline", decl);
4357 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4359 if (TREE_CODE (decl) == VAR_DECL)
4361 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4362 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4363 error ("%q#D is not a static member of %q#T", decl, context);
4366 if (DECL_CONTEXT (field) != context)
4368 if (!same_type_p (DECL_CONTEXT (field), context))
4369 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4370 "to be defined as %<%T::%D%>",
4371 DECL_CONTEXT (field), DECL_NAME (decl),
4372 context, DECL_NAME (decl));
4373 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4375 if (processing_specialization
4376 && template_class_depth (context) == 0
4377 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4378 error ("template header not allowed in member definition "
4379 "of explicitly specialized class");
4380 /* Static data member are tricky; an in-class initialization
4381 still doesn't provide a definition, so the in-class
4382 declaration will have DECL_EXTERNAL set, but will have an
4383 initialization. Thus, duplicate_decls won't warn
4384 about this situation, and so we check here. */
4385 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4386 error ("duplicate initialization of %qD", decl);
4387 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4389 if (declspecs->specs[(int) ds_constexpr]
4390 && !DECL_DECLARED_CONSTEXPR_P (field))
4391 error ("%qD declared %<constexpr%> outside its class", field);
4396 tree field = check_classfn (context, decl,
4397 (processing_template_decl
4398 > template_class_depth (context))
4399 ? current_template_parms
4401 if (field && field != error_mark_node
4402 && duplicate_decls (decl, field,
4403 /*newdecl_is_friend=*/false))
4407 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4408 DECL_IN_AGGR_P (decl) = 0;
4409 /* Do not mark DECL as an explicit specialization if it was not
4410 already marked as an instantiation; a declaration should
4411 never be marked as a specialization unless we know what
4412 template is being specialized. */
4413 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4415 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4417 /* [temp.expl.spec] An explicit specialization of a static data
4418 member of a template is a definition if the declaration
4419 includes an initializer; otherwise, it is a declaration.
4421 We check for processing_specialization so this only applies
4422 to the new specialization syntax. */
4423 if (!initialized && processing_specialization)
4424 DECL_EXTERNAL (decl) = 1;
4427 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4428 /* Aliases are definitions. */
4430 permerror (input_location, "declaration of %q#D outside of class is not definition",
4434 was_public = TREE_PUBLIC (decl);
4436 /* Enter this declaration into the symbol table. */
4437 decl = maybe_push_decl (decl);
4439 if (processing_template_decl)
4440 decl = push_template_decl (decl);
4441 if (decl == error_mark_node)
4442 return error_mark_node;
4444 /* Tell the back end to use or not use .common as appropriate. If we say
4445 -fconserve-space, we want this to save .data space, at the expense of
4446 wrong semantics. If we say -fno-conserve-space, we want this to
4447 produce errors about redefs; to do this we force variables into the
4449 if (flag_conserve_space
4450 && TREE_CODE (decl) == VAR_DECL
4451 && TREE_PUBLIC (decl)
4452 && !DECL_THREAD_LOCAL_P (decl)
4453 && !have_global_bss_p ())
4454 DECL_COMMON (decl) = 1;
4456 if (TREE_CODE (decl) == VAR_DECL
4457 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4458 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4460 /* This is a const variable with implicit 'static'. Set
4461 DECL_THIS_STATIC so we can tell it from variables that are
4462 !TREE_PUBLIC because of the anonymous namespace. */
4463 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4464 DECL_THIS_STATIC (decl) = 1;
4467 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4468 start_decl_1 (decl, initialized);
4473 /* Process the declaration of a variable DECL. INITIALIZED is true
4474 iff DECL is explicitly initialized. (INITIALIZED is false if the
4475 variable is initialized via an implicitly-called constructor.)
4476 This function must be called for ordinary variables (including, for
4477 example, implicit instantiations of templates), but must not be
4478 called for template declarations. */
4481 start_decl_1 (tree decl, bool initialized)
4485 bool aggregate_definition_p;
4487 gcc_assert (!processing_template_decl);
4489 if (error_operand_p (decl))
4492 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4494 type = TREE_TYPE (decl);
4495 complete_p = COMPLETE_TYPE_P (type);
4496 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4498 /* If an explicit initializer is present, or if this is a definition
4499 of an aggregate, then we need a complete type at this point.
4500 (Scalars are always complete types, so there is nothing to
4501 check.) This code just sets COMPLETE_P; errors (if necessary)
4502 are issued below. */
4503 if ((initialized || aggregate_definition_p)
4505 && COMPLETE_TYPE_P (complete_type (type)))
4508 /* We will not yet have set TREE_READONLY on DECL if the type
4509 was "const", but incomplete, before this point. But, now, we
4510 have a complete type, so we can try again. */
4511 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4515 /* Is it valid for this decl to have an initializer at all? */
4517 /* Don't allow initializations for incomplete types except for
4518 arrays which might be completed by the initialization. */
4520 ; /* A complete type is ok. */
4521 else if (type_uses_auto (type))
4522 ; /* An auto type is ok. */
4523 else if (TREE_CODE (type) != ARRAY_TYPE)
4525 error ("variable %q#D has initializer but incomplete type", decl);
4526 type = TREE_TYPE (decl) = error_mark_node;
4528 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4530 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4531 error ("elements of array %q#D have incomplete type", decl);
4532 /* else we already gave an error in start_decl. */
4535 else if (aggregate_definition_p && !complete_p)
4537 if (type_uses_auto (type))
4538 error ("declaration of %q#D has no initializer", decl);
4540 error ("aggregate %q#D has incomplete type and cannot be defined",
4542 /* Change the type so that assemble_variable will give
4543 DECL an rtl we can live with: (mem (const_int 0)). */
4544 type = TREE_TYPE (decl) = error_mark_node;
4547 /* Create a new scope to hold this declaration if necessary.
4548 Whether or not a new scope is necessary cannot be determined
4549 until after the type has been completed; if the type is a
4550 specialization of a class template it is not until after
4551 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4552 will be set correctly. */
4553 maybe_push_cleanup_level (type);
4556 /* Handle initialization of references. DECL, TYPE, and INIT have the
4557 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4558 but will be set to a new CLEANUP_STMT if a temporary is created
4559 that must be destroyed subsequently.
4561 Returns an initializer expression to use to initialize DECL, or
4562 NULL if the initialization can be performed statically.
4564 Quotes on semantics can be found in ARM 8.4.3. */
4567 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4571 if (init == NULL_TREE)
4573 if ((DECL_LANG_SPECIFIC (decl) == 0
4574 || DECL_IN_AGGR_P (decl) == 0)
4575 && ! DECL_THIS_EXTERN (decl))
4576 error ("%qD declared as reference but not initialized", decl);
4580 if (TREE_CODE (init) == TREE_LIST)
4581 init = build_x_compound_expr_from_list (init, ELK_INIT,
4582 tf_warning_or_error);
4584 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4585 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4586 /* Note: default conversion is only called in very special cases. */
4587 init = decay_conversion (init);
4589 /* Convert INIT to the reference type TYPE. This may involve the
4590 creation of a temporary, whose lifetime must be the same as that
4591 of the reference. If so, a DECL_EXPR for the temporary will be
4592 added just after the DECL_EXPR for DECL. That's why we don't set
4593 DECL_INITIAL for local references (instead assigning to them
4594 explicitly); we need to allow the temporary to be initialized
4596 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4598 if (tmp == error_mark_node)
4600 else if (tmp == NULL_TREE)
4602 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4606 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4609 DECL_INITIAL (decl) = tmp;
4614 /* Subroutine of check_initializer. We're initializing a DECL of
4615 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4616 extend the lifetime of the underlying array to match that of the decl,
4617 just like for reference initialization. CLEANUP is as for
4618 grok_reference_init. */
4621 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4624 tree aggr_init, array, arrtype;
4625 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4626 if (error_operand_p (init))
4627 return error_mark_node;
4629 aggr_init = TARGET_EXPR_INITIAL (init);
4630 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4631 arrtype = TREE_TYPE (array);
4633 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4634 array = TREE_OPERAND (array, 0);
4635 /* If the array is constant, finish_compound_literal already made it a
4636 static variable and we don't need to do anything here. */
4637 if (decl && TREE_CODE (array) == TARGET_EXPR)
4639 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4640 var = build_address (var);
4641 var = convert (arrtype, var);
4642 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4647 /* Designated initializers in arrays are not supported in GNU C++.
4648 The parser cannot detect this error since it does not know whether
4649 a given brace-enclosed initializer is for a class type or for an
4650 array. This function checks that CE does not use a designated
4651 initializer. If it does, an error is issued. Returns true if CE
4652 is valid, i.e., does not have a designated initializer. */
4655 check_array_designated_initializer (const constructor_elt *ce)
4657 /* Designated initializers for array elements are not supported. */
4660 /* The parser only allows identifiers as designated
4662 if (ce->index == error_mark_node)
4663 error ("name used in a GNU-style designated "
4664 "initializer for an array");
4665 else if (TREE_CODE (ce->index) == INTEGER_CST)
4666 /* An index added by reshape_init. */
4670 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4671 error ("name %qD used in a GNU-style designated "
4672 "initializer for an array", ce->index);
4680 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4681 array until we finish parsing the initializer. If that's the
4682 situation we're in, update DECL accordingly. */
4685 maybe_deduce_size_from_array_init (tree decl, tree init)
4687 tree type = TREE_TYPE (decl);
4689 if (TREE_CODE (type) == ARRAY_TYPE
4690 && TYPE_DOMAIN (type) == NULL_TREE
4691 && TREE_CODE (decl) != TYPE_DECL)
4693 /* do_default is really a C-ism to deal with tentative definitions.
4694 But let's leave it here to ease the eventual merge. */
4695 int do_default = !DECL_EXTERNAL (decl);
4696 tree initializer = init ? init : DECL_INITIAL (decl);
4699 /* Check that there are no designated initializers in INIT, as
4700 those are not supported in GNU C++, and as the middle-end
4701 will crash if presented with a non-numeric designated
4703 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4705 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4706 constructor_elt *ce;
4708 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4709 if (!check_array_designated_initializer (ce))
4715 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4719 error ("initializer fails to determine size of %qD", decl);
4720 TREE_TYPE (decl) = error_mark_node;
4722 else if (failure == 2)
4726 error ("array size missing in %qD", decl);
4727 TREE_TYPE (decl) = error_mark_node;
4729 /* If a `static' var's size isn't known, make it extern as
4730 well as static, so it does not get allocated. If it's not
4731 `static', then don't mark it extern; finish_incomplete_decl
4732 will give it a default size and it will get allocated. */
4733 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4734 DECL_EXTERNAL (decl) = 1;
4736 else if (failure == 3)
4738 error ("zero-size array %qD", decl);
4739 TREE_TYPE (decl) = error_mark_node;
4743 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4745 relayout_decl (decl);
4749 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4750 any appropriate error messages regarding the layout. */
4753 layout_var_decl (tree decl)
4757 type = TREE_TYPE (decl);
4758 if (type == error_mark_node)
4761 /* If we haven't already layed out this declaration, do so now.
4762 Note that we must not call complete type for an external object
4763 because it's type might involve templates that we are not
4764 supposed to instantiate yet. (And it's perfectly valid to say
4765 `extern X x' for some incomplete type `X'.) */
4766 if (!DECL_EXTERNAL (decl))
4767 complete_type (type);
4768 if (!DECL_SIZE (decl)
4769 && TREE_TYPE (decl) != error_mark_node
4770 && (COMPLETE_TYPE_P (type)
4771 || (TREE_CODE (type) == ARRAY_TYPE
4772 && !TYPE_DOMAIN (type)
4773 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4774 layout_decl (decl, 0);
4776 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4778 /* An automatic variable with an incomplete type: that is an error.
4779 Don't talk about array types here, since we took care of that
4780 message in grokdeclarator. */
4781 error ("storage size of %qD isn%'t known", decl);
4782 TREE_TYPE (decl) = error_mark_node;
4785 /* Keep this code around in case we later want to control debug info
4786 based on whether a type is "used". (jason 1999-11-11) */
4788 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4789 /* Let debugger know it should output info for this type. */
4790 note_debug_info_needed (ttype);
4792 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4793 note_debug_info_needed (DECL_CONTEXT (decl));
4796 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4797 && DECL_SIZE (decl) != NULL_TREE
4798 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4800 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4801 constant_expression_warning (DECL_SIZE (decl));
4804 error ("storage size of %qD isn%'t constant", decl);
4805 TREE_TYPE (decl) = error_mark_node;
4810 /* If a local static variable is declared in an inline function, or if
4811 we have a weak definition, we must endeavor to create only one
4812 instance of the variable at link-time. */
4815 maybe_commonize_var (tree decl)
4817 /* Static data in a function with comdat linkage also has comdat
4819 if (TREE_STATIC (decl)
4820 /* Don't mess with __FUNCTION__. */
4821 && ! DECL_ARTIFICIAL (decl)
4822 && DECL_FUNCTION_SCOPE_P (decl)
4823 && vague_linkage_p (DECL_CONTEXT (decl)))
4827 /* With weak symbols, we simply make the variable COMDAT;
4828 that will cause copies in multiple translations units to
4830 comdat_linkage (decl);
4834 if (DECL_INITIAL (decl) == NULL_TREE
4835 || DECL_INITIAL (decl) == error_mark_node)
4837 /* Without weak symbols, we can use COMMON to merge
4838 uninitialized variables. */
4839 TREE_PUBLIC (decl) = 1;
4840 DECL_COMMON (decl) = 1;
4844 /* While for initialized variables, we must use internal
4845 linkage -- which means that multiple copies will not
4847 TREE_PUBLIC (decl) = 0;
4848 DECL_COMMON (decl) = 0;
4849 warning_at (input_location, 0,
4850 "sorry: semantics of inline function static "
4851 "data %q+#D are wrong (you%'ll wind up "
4852 "with multiple copies)", decl);
4853 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4854 " you can work around this by removing "
4859 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4860 /* Set it up again; we might have set DECL_INITIAL since the last
4862 comdat_linkage (decl);
4865 /* Issue an error message if DECL is an uninitialized const variable. */
4868 check_for_uninitialized_const_var (tree decl)
4870 tree type = strip_array_types (TREE_TYPE (decl));
4872 /* ``Unless explicitly declared extern, a const object does not have
4873 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4875 if (TREE_CODE (decl) == VAR_DECL
4876 && TREE_CODE (type) != REFERENCE_TYPE
4877 && CP_TYPE_CONST_P (type)
4878 && (!TYPE_NEEDS_CONSTRUCTING (type)
4879 || !type_has_user_provided_default_constructor (type))
4880 && !DECL_INITIAL (decl))
4882 permerror (DECL_SOURCE_LOCATION (decl),
4883 "uninitialized const %qD", decl);
4885 if (CLASS_TYPE_P (type)
4886 && !type_has_user_provided_default_constructor (type))
4888 tree defaulted_ctor;
4890 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4891 "%q#T has no user-provided default constructor", type);
4892 defaulted_ctor = in_class_defaulted_default_constructor (type);
4894 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4895 "constructor is not user-provided because it is "
4896 "explicitly defaulted in the class body");
4901 /* Structure holding the current initializer being processed by reshape_init.
4902 CUR is a pointer to the current element being processed, END is a pointer
4903 after the last element present in the initializer. */
4904 typedef struct reshape_iterator_t
4906 constructor_elt *cur;
4907 constructor_elt *end;
4910 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4912 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4913 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4914 initialized. If there are no more such fields, the return value
4918 next_initializable_field (tree field)
4921 && (TREE_CODE (field) != FIELD_DECL
4922 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4923 || DECL_ARTIFICIAL (field)))
4924 field = DECL_CHAIN (field);
4929 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4930 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4931 INTEGER_CST representing the size of the array minus one (the maximum index),
4932 or NULL_TREE if the array was declared without specifying the size. D is
4933 the iterator within the constructor. */
4936 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4937 tsubst_flags_t complain)
4940 bool sized_array_p = (max_index != NULL_TREE);
4941 unsigned HOST_WIDE_INT max_index_cst = 0;
4942 unsigned HOST_WIDE_INT index;
4944 /* The initializer for an array is always a CONSTRUCTOR. */
4945 new_init = build_constructor (init_list_type_node, NULL);
4949 /* Minus 1 is used for zero sized arrays. */
4950 if (integer_all_onesp (max_index))
4953 if (host_integerp (max_index, 1))
4954 max_index_cst = tree_low_cst (max_index, 1);
4955 /* sizetype is sign extended, not zero extended. */
4957 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4961 /* Loop until there are no more initializers. */
4963 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4968 check_array_designated_initializer (d->cur);
4969 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4971 if (elt_init == error_mark_node)
4972 return error_mark_node;
4973 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4974 size_int (index), elt_init);
4975 if (!TREE_CONSTANT (elt_init))
4976 TREE_CONSTANT (new_init) = false;
4982 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4983 Parameters are the same of reshape_init_r. */
4986 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
4988 tree max_index = NULL_TREE;
4990 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4992 if (TYPE_DOMAIN (type))
4993 max_index = array_type_nelts (type);
4995 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
4998 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4999 Parameters are the same of reshape_init_r. */
5002 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5004 tree max_index = NULL_TREE;
5006 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5008 if (COMPOUND_LITERAL_P (d->cur->value))
5010 tree value = d->cur->value;
5011 if (!same_type_p (TREE_TYPE (value), type))
5013 if (complain & tf_error)
5014 error ("invalid type %qT as initializer for a vector of type %qT",
5015 TREE_TYPE (d->cur->value), type);
5016 value = error_mark_node;
5022 /* For a vector, we initialize it as an array of the appropriate size. */
5023 if (TREE_CODE (type) == VECTOR_TYPE)
5024 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5026 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5029 /* Subroutine of reshape_init_r, processes the initializers for classes
5030 or union. Parameters are the same of reshape_init_r. */
5033 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5034 tsubst_flags_t complain)
5039 gcc_assert (CLASS_TYPE_P (type));
5041 /* The initializer for a class is always a CONSTRUCTOR. */
5042 new_init = build_constructor (init_list_type_node, NULL);
5043 field = next_initializable_field (TYPE_FIELDS (type));
5049 An initializer for an aggregate member that is an
5050 empty class shall have the form of an empty
5051 initializer-list {}. */
5052 if (!first_initializer_p)
5054 if (complain & tf_error)
5055 error ("initializer for %qT must be brace-enclosed", type);
5056 return error_mark_node;
5061 /* Loop through the initializable fields, gathering initializers. */
5062 while (d->cur != d->end)
5066 /* Handle designated initializers, as an extension. */
5069 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5071 if (!field || TREE_CODE (field) != FIELD_DECL)
5073 if (complain & tf_error)
5074 error ("%qT has no non-static data member named %qD", type,
5076 return error_mark_node;
5080 /* If we processed all the member of the class, we are done. */
5084 field_init = reshape_init_r (TREE_TYPE (field), d,
5085 /*first_initializer_p=*/false, complain);
5086 if (field_init == error_mark_node)
5087 return error_mark_node;
5089 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5093 When a union is initialized with a brace-enclosed
5094 initializer, the braces shall only contain an
5095 initializer for the first member of the union. */
5096 if (TREE_CODE (type) == UNION_TYPE)
5099 field = next_initializable_field (DECL_CHAIN (field));
5105 /* Subroutine of reshape_init, which processes a single initializer (part of
5106 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5107 iterator within the CONSTRUCTOR which points to the initializer to process.
5108 FIRST_INITIALIZER_P is true if this is the first initializer of the
5109 outermost CONSTRUCTOR node. */
5112 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5113 tsubst_flags_t complain)
5115 tree init = d->cur->value;
5117 if (error_operand_p (init))
5118 return error_mark_node;
5120 if (TREE_CODE (type) == COMPLEX_TYPE)
5122 /* A complex type can be initialized from one or two initializers,
5123 but braces are not elided. */
5125 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5127 if (CONSTRUCTOR_NELTS (init) > 2)
5129 if (complain & tf_error)
5130 error ("too many initializers for %qT", type);
5132 return error_mark_node;
5135 else if (first_initializer_p && d->cur != d->end)
5137 VEC(constructor_elt, gc) *v = 0;
5138 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5139 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5141 init = build_constructor (init_list_type_node, v);
5146 /* A non-aggregate type is always initialized with a single
5148 if (!CP_AGGREGATE_TYPE_P (type))
5150 /* It is invalid to initialize a non-aggregate type with a
5151 brace-enclosed initializer before C++0x.
5152 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5153 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5154 a CONSTRUCTOR (with a record type). */
5155 if (TREE_CODE (init) == CONSTRUCTOR
5156 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5158 if (SCALAR_TYPE_P (type))
5160 if (complain & tf_error)
5161 error ("braces around scalar initializer for type %qT", type);
5162 init = error_mark_node;
5165 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5174 All implicit type conversions (clause _conv_) are considered when
5175 initializing the aggregate member with an initializer from an
5176 initializer-list. If the initializer can initialize a member,
5177 the member is initialized. Otherwise, if the member is itself a
5178 non-empty subaggregate, brace elision is assumed and the
5179 initializer is considered for the initialization of the first
5180 member of the subaggregate. */
5181 if (TREE_CODE (init) != CONSTRUCTOR
5182 /* But don't try this for the first initializer, since that would be
5183 looking through the outermost braces; A a2 = { a1 }; is not a
5184 valid aggregate initialization. */
5185 && !first_initializer_p
5186 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5187 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5193 /* [dcl.init.string]
5195 A char array (whether plain char, signed char, or unsigned char)
5196 can be initialized by a string-literal (optionally enclosed in
5197 braces); a wchar_t array can be initialized by a wide
5198 string-literal (optionally enclosed in braces). */
5199 if (TREE_CODE (type) == ARRAY_TYPE
5200 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5202 tree str_init = init;
5204 /* Strip one level of braces if and only if they enclose a single
5205 element (as allowed by [dcl.init.string]). */
5206 if (!first_initializer_p
5207 && TREE_CODE (str_init) == CONSTRUCTOR
5208 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5210 str_init = VEC_index (constructor_elt,
5211 CONSTRUCTOR_ELTS (str_init), 0)->value;
5214 /* If it's a string literal, then it's the initializer for the array
5215 as a whole. Otherwise, continue with normal initialization for
5216 array types (one value per array element). */
5217 if (TREE_CODE (str_init) == STRING_CST)
5224 /* The following cases are about aggregates. If we are not within a full
5225 initializer already, and there is not a CONSTRUCTOR, it means that there
5226 is a missing set of braces (that is, we are processing the case for
5227 which reshape_init exists). */
5228 if (!first_initializer_p)
5230 if (TREE_CODE (init) == CONSTRUCTOR)
5232 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5233 /* There is no need to reshape pointer-to-member function
5234 initializers, as they are always constructed correctly
5235 by the front end. */
5237 else if (COMPOUND_LITERAL_P (init))
5238 /* For a nested compound literal, there is no need to reshape since
5239 brace elision is not allowed. Even if we decided to allow it,
5240 we should add a call to reshape_init in finish_compound_literal,
5241 before calling digest_init, so changing this code would still
5242 not be necessary. */
5243 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5247 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5248 return reshape_init (type, init, complain);
5252 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5256 /* Dispatch to specialized routines. */
5257 if (CLASS_TYPE_P (type))
5258 return reshape_init_class (type, d, first_initializer_p, complain);
5259 else if (TREE_CODE (type) == ARRAY_TYPE)
5260 return reshape_init_array (type, d, complain);
5261 else if (TREE_CODE (type) == VECTOR_TYPE)
5262 return reshape_init_vector (type, d, complain);
5267 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5268 brace-enclosed aggregate initializer.
5270 INIT is the CONSTRUCTOR containing the list of initializers describing
5271 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5272 It may not presently match the shape of the TYPE; for example:
5274 struct S { int a; int b; };
5275 struct S a[] = { 1, 2, 3, 4 };
5277 Here INIT will hold a VEC of four elements, rather than a
5278 VEC of two elements, each itself a VEC of two elements. This
5279 routine transforms INIT from the former form into the latter. The
5280 revised CONSTRUCTOR node is returned. */
5283 reshape_init (tree type, tree init, tsubst_flags_t complain)
5285 VEC(constructor_elt, gc) *v;
5289 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5291 v = CONSTRUCTOR_ELTS (init);
5293 /* An empty constructor does not need reshaping, and it is always a valid
5295 if (VEC_empty (constructor_elt, v))
5298 /* Recurse on this CONSTRUCTOR. */
5299 d.cur = VEC_index (constructor_elt, v, 0);
5300 d.end = d.cur + VEC_length (constructor_elt, v);
5302 new_init = reshape_init_r (type, &d, true, complain);
5303 if (new_init == error_mark_node)
5304 return error_mark_node;
5306 /* Make sure all the element of the constructor were used. Otherwise,
5307 issue an error about exceeding initializers. */
5310 if (complain & tf_error)
5311 error ("too many initializers for %qT", type);
5313 return error_mark_node;
5319 /* Verify array initializer. Returns true if errors have been reported. */
5322 check_array_initializer (tree decl, tree type, tree init)
5324 tree element_type = TREE_TYPE (type);
5326 /* The array type itself need not be complete, because the
5327 initializer may tell us how many elements are in the array.
5328 But, the elements of the array must be complete. */
5329 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5332 error ("elements of array %q#D have incomplete type", decl);
5334 error ("elements of array %q#T have incomplete type", type);
5337 /* It is not valid to initialize a VLA. */
5339 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5340 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5343 error ("variable-sized object %qD may not be initialized", decl);
5345 error ("variable-sized compound literal");
5351 /* Subroutine of check_initializer; args are passed down from that function.
5352 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5355 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5358 int saved_stmts_are_full_exprs_p = 0;
5359 if (building_stmt_list_p ())
5361 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5362 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5364 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5365 if (building_stmt_list_p ())
5366 current_stmt_tree ()->stmts_are_full_exprs_p =
5367 saved_stmts_are_full_exprs_p;
5371 /* Verify INIT (the initializer for DECL), and record the
5372 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5373 grok_reference_init.
5375 If the return value is non-NULL, it is an expression that must be
5376 evaluated dynamically to initialize DECL. */
5379 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5381 tree type = TREE_TYPE (decl);
5382 tree init_code = NULL;
5383 tree extra_init = NULL_TREE;
5386 /* Things that are going to be initialized need to have complete
5388 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5390 if (DECL_HAS_VALUE_EXPR_P (decl))
5392 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5393 it doesn't have storage to be initialized. */
5394 gcc_assert (init == NULL_TREE);
5398 if (type == error_mark_node)
5399 /* We will have already complained. */
5402 if (TREE_CODE (type) == ARRAY_TYPE)
5404 if (check_array_initializer (decl, type, init))
5407 else if (!COMPLETE_TYPE_P (type))
5409 error ("%qD has incomplete type", decl);
5410 TREE_TYPE (decl) = error_mark_node;
5414 /* There is no way to make a variable-sized class type in GNU C++. */
5415 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5417 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5419 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5420 if (SCALAR_TYPE_P (type))
5424 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5425 init = build_zero_init (type, NULL_TREE, false);
5427 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5429 error ("scalar object %qD requires one element in initializer",
5431 TREE_TYPE (decl) = error_mark_node;
5437 if (TREE_CODE (decl) == CONST_DECL)
5439 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5441 DECL_INITIAL (decl) = init;
5443 gcc_assert (init != NULL_TREE);
5446 else if (!init && DECL_REALLY_EXTERN (decl))
5448 else if (TREE_CODE (type) == REFERENCE_TYPE)
5449 init = grok_reference_init (decl, type, init, cleanup);
5450 else if (init || type_build_ctor_call (type))
5453 check_for_uninitialized_const_var (decl);
5454 /* Do not reshape constructors of vectors (they don't need to be
5456 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5458 if (is_std_init_list (type))
5459 init = build_init_list_var_init (decl, type, init,
5460 &extra_init, cleanup);
5461 else if (TYPE_NON_AGGREGATE_CLASS (type))
5463 /* Don't reshape if the class has constructors. */
5464 if (cxx_dialect == cxx98)
5465 error ("in C++98 %qD must be initialized by constructor, "
5469 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5471 error ("opaque vector types cannot be initialized");
5472 init = error_mark_node;
5476 init = reshape_init (type, init, tf_warning_or_error);
5477 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5478 check_narrowing (type, init);
5482 /* If DECL has an array type without a specific bound, deduce the
5483 array size from the initializer. */
5484 maybe_deduce_size_from_array_init (decl, init);
5485 type = TREE_TYPE (decl);
5486 if (type == error_mark_node)
5489 if (type_build_ctor_call (type)
5490 || (CLASS_TYPE_P (type)
5491 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5493 init_code = build_aggr_init_full_exprs (decl, init, flags);
5495 /* If this is a constexpr initializer, expand_default_init will
5496 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5497 case, pull the initializer back out and pass it down into
5498 store_init_value. */
5499 while (TREE_CODE (init_code) == EXPR_STMT
5500 || TREE_CODE (init_code) == CONVERT_EXPR)
5501 init_code = TREE_OPERAND (init_code, 0);
5502 if (TREE_CODE (init_code) == INIT_EXPR)
5504 init = TREE_OPERAND (init_code, 1);
5505 init_code = NULL_TREE;
5506 /* Don't call digest_init; it's unnecessary and will complain
5507 about aggregate initialization of non-aggregate classes. */
5508 flags |= LOOKUP_ALREADY_DIGESTED;
5510 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5512 /* Declared constexpr, but no suitable initializer; massage
5513 init appropriately so we can pass it into store_init_value
5515 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5516 init = finish_compound_literal (type, init,
5517 tf_warning_or_error);
5518 else if (CLASS_TYPE_P (type)
5519 && (!init || TREE_CODE (init) == TREE_LIST))
5521 init = build_functional_cast (type, init, tf_none);
5522 if (init != error_mark_node)
5523 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5525 init_code = NULL_TREE;
5531 if (init && TREE_CODE (init) != TREE_VEC)
5533 init_code = store_init_value (decl, init, flags);
5534 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5535 && DECL_INITIAL (decl)
5536 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5537 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5538 warning (0, "array %qD initialized by parenthesized string literal %qE",
5539 decl, DECL_INITIAL (decl));
5545 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5546 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5547 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5548 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5551 check_for_uninitialized_const_var (decl);
5554 if (init && init != error_mark_node)
5555 init_code = build2 (INIT_EXPR, type, decl, init);
5558 init_code = add_stmt_to_compound (extra_init, init_code);
5560 if (init_code && DECL_IN_AGGR_P (decl))
5562 static int explained = 0;
5564 if (cxx_dialect < cxx0x)
5565 error ("initializer invalid for static member with constructor");
5567 error ("non-constant in-class initialization invalid for static "
5568 "member %qD", decl);
5571 error ("(an out of class initialization is required)");
5579 /* If DECL is not a local variable, give it RTL. */
5582 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5584 int toplev = toplevel_bindings_p ();
5586 const char *filename;
5588 /* Set the DECL_ASSEMBLER_NAME for the object. */
5591 /* The `register' keyword, when used together with an
5592 asm-specification, indicates that the variable should be
5593 placed in a particular register. */
5594 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5596 set_user_assembler_name (decl, asmspec);
5597 DECL_HARD_REGISTER (decl) = 1;
5601 if (TREE_CODE (decl) == FUNCTION_DECL
5602 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5603 set_builtin_user_assembler_name (decl, asmspec);
5604 set_user_assembler_name (decl, asmspec);
5608 /* Handle non-variables up front. */
5609 if (TREE_CODE (decl) != VAR_DECL)
5611 rest_of_decl_compilation (decl, toplev, at_eof);
5615 /* If we see a class member here, it should be a static data
5617 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5619 gcc_assert (TREE_STATIC (decl));
5620 /* An in-class declaration of a static data member should be
5621 external; it is only a declaration, and not a definition. */
5622 if (init == NULL_TREE)
5623 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5626 /* We don't create any RTL for local variables. */
5627 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5630 /* We defer emission of local statics until the corresponding
5631 DECL_EXPR is expanded. */
5632 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5634 /* We try to defer namespace-scope static constants so that they are
5635 not emitted into the object file unnecessarily. */
5636 filename = input_filename;
5637 if (!DECL_VIRTUAL_P (decl)
5638 && TREE_READONLY (decl)
5639 && DECL_INITIAL (decl) != NULL_TREE
5640 && DECL_INITIAL (decl) != error_mark_node
5642 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5644 && !TREE_PUBLIC (decl))
5646 /* Fool with the linkage of static consts according to #pragma
5648 struct c_fileinfo *finfo = get_fileinfo (filename);
5649 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5651 TREE_PUBLIC (decl) = 1;
5652 DECL_EXTERNAL (decl) = finfo->interface_only;
5657 /* Likewise for template instantiations. */
5658 else if (DECL_LANG_SPECIFIC (decl)
5659 && DECL_IMPLICIT_INSTANTIATION (decl))
5662 /* If we're not deferring, go ahead and assemble the variable. */
5664 rest_of_decl_compilation (decl, toplev, at_eof);
5667 /* walk_tree helper for wrap_temporary_cleanups, below. */
5670 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5672 if (TYPE_P (*stmt_p))
5678 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5680 tree guard = (tree)data;
5681 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5683 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5684 /* Tell honor_protect_cleanup_actions to handle this as a separate
5686 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5688 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5694 /* We're initializing a local variable which has a cleanup GUARD. If there
5695 are any temporaries used in the initializer INIT of this variable, we
5696 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5697 variable will be cleaned up properly if one of them throws.
5699 Unfortunately, there's no way to express this properly in terms of
5700 nesting, as the regions for the temporaries overlap the region for the
5701 variable itself; if there are two temporaries, the variable needs to be
5702 the first thing destroyed if either of them throws. However, we only
5703 want to run the variable's cleanup if it actually got constructed. So
5704 we need to guard the temporary cleanups with the variable's cleanup if
5705 they are run on the normal path, but not if they are run on the
5706 exceptional path. We implement this by telling
5707 honor_protect_cleanup_actions to strip the variable cleanup from the
5708 exceptional path. */
5711 wrap_temporary_cleanups (tree init, tree guard)
5713 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5716 /* Generate code to initialize DECL (a local variable). */
5719 initialize_local_var (tree decl, tree init)
5721 tree type = TREE_TYPE (decl);
5725 gcc_assert (TREE_CODE (decl) == VAR_DECL
5726 || TREE_CODE (decl) == RESULT_DECL);
5727 gcc_assert (!TREE_STATIC (decl));
5729 if (DECL_SIZE (decl) == NULL_TREE)
5731 /* If we used it already as memory, it must stay in memory. */
5732 DECL_INITIAL (decl) = NULL_TREE;
5733 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5737 if (type == error_mark_node)
5740 /* Compute and store the initial value. */
5741 already_used = TREE_USED (decl) || TREE_USED (type);
5742 if (TREE_USED (type))
5743 DECL_READ_P (decl) = 1;
5745 /* Generate a cleanup, if necessary. */
5746 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5748 /* Perform the initialization. */
5751 if (TREE_CODE (init) == INIT_EXPR
5752 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5754 /* Stick simple initializers in DECL_INITIAL so that
5755 -Wno-init-self works (c++/34772). */
5756 gcc_assert (TREE_OPERAND (init, 0) == decl);
5757 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5761 int saved_stmts_are_full_exprs_p;
5763 /* If we're only initializing a single object, guard the
5764 destructors of any temporaries used in its initializer with
5765 its destructor. This isn't right for arrays because each
5766 element initialization is a full-expression. */
5767 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5768 wrap_temporary_cleanups (init, cleanup);
5770 gcc_assert (building_stmt_list_p ());
5771 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5772 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5773 finish_expr_stmt (init);
5774 current_stmt_tree ()->stmts_are_full_exprs_p =
5775 saved_stmts_are_full_exprs_p;
5779 /* Set this to 0 so we can tell whether an aggregate which was
5780 initialized was ever used. Don't do this if it has a
5781 destructor, so we don't complain about the 'resource
5782 allocation is initialization' idiom. Now set
5783 attribute((unused)) on types so decls of that type will be
5784 marked used. (see TREE_USED, above.) */
5785 if (TYPE_NEEDS_CONSTRUCTING (type)
5787 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5788 && DECL_NAME (decl))
5789 TREE_USED (decl) = 0;
5790 else if (already_used)
5791 TREE_USED (decl) = 1;
5794 finish_decl_cleanup (decl, cleanup);
5797 /* DECL is a VAR_DECL for a compiler-generated variable with static
5798 storage duration (like a virtual table) whose initializer is a
5799 compile-time constant. Initialize the variable and provide it to the
5803 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5806 gcc_assert (DECL_ARTIFICIAL (decl));
5807 init = build_constructor (TREE_TYPE (decl), v);
5808 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5809 DECL_INITIAL (decl) = init;
5810 DECL_INITIALIZED_P (decl) = 1;
5811 determine_visibility (decl);
5812 layout_var_decl (decl);
5813 maybe_commonize_var (decl);
5814 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5817 /* INIT is the initializer for a variable, as represented by the
5818 parser. Returns true iff INIT is type-dependent. */
5821 type_dependent_init_p (tree init)
5823 if (TREE_CODE (init) == TREE_LIST)
5824 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5825 return any_type_dependent_elements_p (init);
5826 else if (TREE_CODE (init) == CONSTRUCTOR)
5827 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5829 VEC(constructor_elt, gc) *elts;
5833 elts = CONSTRUCTOR_ELTS (init);
5834 nelts = VEC_length (constructor_elt, elts);
5835 for (i = 0; i < nelts; ++i)
5836 if (type_dependent_init_p (VEC_index (constructor_elt,
5841 /* It must be a simple expression, e.g., int i = 3; */
5842 return type_dependent_expression_p (init);
5847 /* INIT is the initializer for a variable, as represented by the
5848 parser. Returns true iff INIT is value-dependent. */
5851 value_dependent_init_p (tree init)
5853 if (TREE_CODE (init) == TREE_LIST)
5854 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5855 return any_value_dependent_elements_p (init);
5856 else if (TREE_CODE (init) == CONSTRUCTOR)
5857 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5859 VEC(constructor_elt, gc) *elts;
5863 elts = CONSTRUCTOR_ELTS (init);
5864 nelts = VEC_length (constructor_elt, elts);
5865 for (i = 0; i < nelts; ++i)
5866 if (value_dependent_init_p (VEC_index (constructor_elt,
5871 /* It must be a simple expression, e.g., int i = 3; */
5872 return value_dependent_expression_p (init);
5877 /* Finish processing of a declaration;
5878 install its line number and initial value.
5879 If the length of an array type is not known before,
5880 it must be determined now, from the initial value, or it is an error.
5882 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5883 true, then INIT is an integral constant expression.
5885 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5886 if the (init) syntax was used. */
5889 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5890 tree asmspec_tree, int flags)
5894 const char *asmspec = NULL;
5895 int was_readonly = 0;
5896 bool var_definition_p = false;
5899 if (decl == error_mark_node)
5904 error ("assignment (not initialization) in declaration");
5908 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5909 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5910 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5912 type = TREE_TYPE (decl);
5913 if (type == error_mark_node)
5916 /* Assume no cleanup is required. */
5917 cleanup = NULL_TREE;
5919 /* If a name was specified, get the string. */
5920 if (global_scope_p (current_binding_level))
5921 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5922 if (asmspec_tree && asmspec_tree != error_mark_node)
5923 asmspec = TREE_STRING_POINTER (asmspec_tree);
5925 if (current_class_type
5926 && CP_DECL_CONTEXT (decl) == current_class_type
5927 && TYPE_BEING_DEFINED (current_class_type)
5928 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5929 && (DECL_INITIAL (decl) || init))
5930 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5932 auto_node = type_uses_auto (type);
5936 if (init == NULL_TREE)
5938 error ("declaration of %q#D has no initializer", decl);
5939 TREE_TYPE (decl) = error_mark_node;
5943 if (TREE_CODE (d_init) == TREE_LIST)
5944 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5945 tf_warning_or_error);
5946 d_init = resolve_nondeduced_context (d_init);
5947 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5949 if (type == error_mark_node)
5953 if (!ensure_literal_type_for_constexpr_object (decl))
5954 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5956 if (TREE_CODE (decl) == VAR_DECL
5957 && DECL_CLASS_SCOPE_P (decl)
5958 && DECL_INITIALIZED_IN_CLASS_P (decl))
5959 check_static_variable_definition (decl, type);
5961 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5964 if (init == ridpointers[(int)RID_DELETE])
5966 /* FIXME check this is 1st decl. */
5967 DECL_DELETED_FN (decl) = 1;
5968 DECL_DECLARED_INLINE_P (decl) = 1;
5969 DECL_INITIAL (decl) = error_mark_node;
5970 FOR_EACH_CLONE (clone, decl)
5972 DECL_DELETED_FN (clone) = 1;
5973 DECL_DECLARED_INLINE_P (clone) = 1;
5974 DECL_INITIAL (clone) = error_mark_node;
5978 else if (init == ridpointers[(int)RID_DEFAULT])
5980 if (defaultable_fn_check (decl))
5981 DECL_DEFAULTED_FN (decl) = 1;
5983 DECL_INITIAL (decl) = NULL_TREE;
5987 if (init && TREE_CODE (decl) == VAR_DECL)
5989 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5990 /* If DECL is a reference, then we want to know whether init is a
5991 reference constant; init_const_expr_p as passed tells us whether
5992 it's an rvalue constant. */
5993 if (TREE_CODE (type) == REFERENCE_TYPE)
5994 init_const_expr_p = potential_constant_expression (init);
5995 if (init_const_expr_p)
5997 /* Set these flags now for templates. We'll update the flags in
5998 store_init_value for instantiations. */
5999 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6000 if (decl_maybe_constant_var_p (decl))
6001 TREE_CONSTANT (decl) = 1;
6005 if (processing_template_decl)
6007 bool type_dependent_p;
6009 /* Add this declaration to the statement-tree. */
6010 if (at_function_scope_p ())
6011 add_decl_expr (decl);
6013 type_dependent_p = dependent_type_p (type);
6015 if (check_for_bare_parameter_packs (init))
6018 DECL_INITIAL (decl) = NULL_TREE;
6021 /* Generally, initializers in templates are expanded when the
6022 template is instantiated. But, if DECL is a variable constant
6023 then it can be used in future constant expressions, so its value
6024 must be available. */
6026 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6027 /* We can't do anything if the decl has dependent type. */;
6029 && init_const_expr_p
6030 && !type_dependent_p
6031 && decl_maybe_constant_var_p (decl)
6032 && !type_dependent_init_p (init)
6033 && !value_dependent_init_p (init))
6035 /* This variable seems to be a non-dependent constant, so process
6036 its initializer. If check_initializer returns non-null the
6037 initialization wasn't constant after all. */
6038 tree init_code = check_initializer (decl, init, flags, &cleanup);
6039 if (init_code == NULL_TREE)
6042 else if (!DECL_PRETTY_FUNCTION_P (decl))
6043 /* Deduce array size even if the initializer is dependent. */
6044 maybe_deduce_size_from_array_init (decl, init);
6047 DECL_INITIAL (decl) = init;
6051 /* Take care of TYPE_DECLs up front. */
6052 if (TREE_CODE (decl) == TYPE_DECL)
6054 if (type != error_mark_node
6055 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6057 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6058 warning (0, "shadowing previous type declaration of %q#D", decl);
6059 set_identifier_type_value (DECL_NAME (decl), decl);
6062 /* If we have installed this as the canonical typedef for this
6063 type, and that type has not been defined yet, delay emitting
6064 the debug information for it, as we will emit it later. */
6065 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6066 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6067 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6069 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6074 /* A reference will be modified here, as it is initialized. */
6075 if (! DECL_EXTERNAL (decl)
6076 && TREE_READONLY (decl)
6077 && TREE_CODE (type) == REFERENCE_TYPE)
6080 TREE_READONLY (decl) = 0;
6083 if (TREE_CODE (decl) == VAR_DECL)
6085 /* Only variables with trivial initialization and destruction can
6086 have thread-local storage. */
6087 if (DECL_THREAD_LOCAL_P (decl)
6088 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6089 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6090 error ("%qD cannot be thread-local because it has non-trivial "
6091 "type %qT", decl, TREE_TYPE (decl));
6092 /* If this is a local variable that will need a mangled name,
6093 register it now. We must do this before processing the
6094 initializer for the variable, since the initialization might
6095 require a guard variable, and since the mangled name of the
6096 guard variable will depend on the mangled name of this
6098 if (DECL_FUNCTION_SCOPE_P (decl)
6099 && TREE_STATIC (decl)
6100 && !DECL_ARTIFICIAL (decl))
6102 push_local_name (decl);
6103 if (DECL_CONSTRUCTOR_P (current_function_decl)
6104 || DECL_DESTRUCTOR_P (current_function_decl))
6105 /* Normally local_decls is populated during GIMPLE lowering,
6106 but [cd]tors are never actually compiled directly. We need
6107 to put statics on the list so we can deal with the label
6108 address extension. */
6109 add_local_decl (cfun, decl);
6112 /* Convert the initializer to the type of DECL, if we have not
6113 already initialized DECL. */
6114 if (!DECL_INITIALIZED_P (decl)
6115 /* If !DECL_EXTERNAL then DECL is being defined. In the
6116 case of a static data member initialized inside the
6117 class-specifier, there can be an initializer even if DECL
6118 is *not* defined. */
6119 && (!DECL_EXTERNAL (decl) || init))
6121 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6124 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6125 /* Allow libjava/prims.cc define primitive classes. */
6126 if (init != NULL_TREE
6127 || jclass == NULL_TREE
6128 || TREE_CODE (jclass) != TYPE_DECL
6129 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6130 || !same_type_ignoring_top_level_qualifiers_p
6131 (type, TREE_TYPE (TREE_TYPE (jclass))))
6132 error ("Java object %qD not allocated with %<new%>", decl);
6135 init = check_initializer (decl, init, flags, &cleanup);
6136 /* Thread-local storage cannot be dynamically initialized. */
6137 if (DECL_THREAD_LOCAL_P (decl) && init)
6139 error ("%qD is thread-local and so cannot be dynamically "
6140 "initialized", decl);
6144 /* Check that the initializer for a static data member was a
6145 constant. Although we check in the parser that the
6146 initializer is an integral constant expression, we do not
6147 simplify division-by-zero at the point at which it
6148 occurs. Therefore, in:
6150 struct S { static const int i = 7 / 0; };
6152 we issue an error at this point. It would
6153 probably be better to forbid division by zero in
6154 integral constant expressions. */
6155 if (DECL_EXTERNAL (decl) && init)
6157 error ("%qD cannot be initialized by a non-constant expression"
6158 " when being declared", decl);
6159 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6167 The memory occupied by any object of static storage
6168 duration is zero-initialized at program startup before
6169 any other initialization takes place.
6171 We cannot create an appropriate initializer until after
6172 the type of DECL is finalized. If DECL_INITIAL is set,
6173 then the DECL is statically initialized, and any
6174 necessary zero-initialization has already been performed. */
6175 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6176 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6177 /*nelts=*/NULL_TREE,
6178 /*static_storage_p=*/true);
6179 /* Remember that the initialization for this variable has
6181 DECL_INITIALIZED_P (decl) = 1;
6182 /* This declaration is the definition of this variable,
6183 unless we are initializing a static data member within
6184 the class specifier. */
6185 if (!DECL_EXTERNAL (decl))
6186 var_definition_p = true;
6188 /* If the variable has an array type, lay out the type, even if
6189 there is no initializer. It is valid to index through the
6190 array, and we must get TYPE_ALIGN set correctly on the array
6192 else if (TREE_CODE (type) == ARRAY_TYPE)
6195 if (TREE_STATIC (decl)
6196 && !at_function_scope_p ()
6197 && current_function_decl == NULL)
6198 /* So decl is a global variable or a static member of a
6199 non local class. Record the types it uses
6200 so that we can decide later to emit debug info for them. */
6201 record_types_used_by_current_var_decl (decl);
6203 else if (TREE_CODE (decl) == FIELD_DECL
6204 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6205 error ("non-static data member %qD has Java class type", decl);
6207 /* Add this declaration to the statement-tree. This needs to happen
6208 after the call to check_initializer so that the DECL_EXPR for a
6209 reference temp is added before the DECL_EXPR for the reference itself. */
6210 if (DECL_FUNCTION_SCOPE_P (decl))
6211 add_decl_expr (decl);
6213 /* Let the middle end know about variables and functions -- but not
6214 static data members in uninstantiated class templates. */
6215 if (TREE_CODE (decl) == VAR_DECL
6216 || TREE_CODE (decl) == FUNCTION_DECL)
6218 if (TREE_CODE (decl) == VAR_DECL)
6220 layout_var_decl (decl);
6221 maybe_commonize_var (decl);
6224 /* This needs to happen after the linkage is set. */
6225 determine_visibility (decl);
6227 if (var_definition_p && TREE_STATIC (decl))
6229 /* If a TREE_READONLY variable needs initialization
6230 at runtime, it is no longer readonly and we need to
6231 avoid MEM_READONLY_P being set on RTL created for it. */
6234 if (TREE_READONLY (decl))
6235 TREE_READONLY (decl) = 0;
6238 else if (was_readonly)
6239 TREE_READONLY (decl) = 1;
6242 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6244 /* Check for abstractness of the type. Notice that there is no
6245 need to strip array types here since the check for those types
6246 is already done within create_array_type_for_decl. */
6247 if (TREE_CODE (type) == FUNCTION_TYPE
6248 || TREE_CODE (type) == METHOD_TYPE)
6249 abstract_virtuals_error (decl, TREE_TYPE (type));
6251 abstract_virtuals_error (decl, type);
6253 if (TREE_TYPE (decl) == error_mark_node)
6254 /* No initialization required. */
6256 else if (TREE_CODE (decl) == FUNCTION_DECL)
6260 if (init == ridpointers[(int)RID_DEFAULT])
6262 /* An out-of-class default definition is defined at
6263 the point where it is explicitly defaulted. */
6264 if (DECL_DELETED_FN (decl))
6265 maybe_explain_implicit_delete (decl);
6266 else if (DECL_INITIAL (decl) == error_mark_node)
6267 synthesize_method (decl);
6270 error ("function %q#D is initialized like a variable", decl);
6272 /* else no initialization required. */
6274 else if (DECL_EXTERNAL (decl)
6275 && ! (DECL_LANG_SPECIFIC (decl)
6276 && DECL_NOT_REALLY_EXTERN (decl)))
6279 DECL_INITIAL (decl) = init;
6281 /* A variable definition. */
6282 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6283 /* Initialize the local variable. */
6284 initialize_local_var (decl, init);
6286 /* If a variable is defined, and then a subsequent
6287 definition with external linkage is encountered, we will
6288 get here twice for the same variable. We want to avoid
6289 calling expand_static_init more than once. For variables
6290 that are not static data members, we can call
6291 expand_static_init only when we actually process the
6292 initializer. It is not legal to redeclare a static data
6293 member, so this issue does not arise in that case. */
6294 else if (var_definition_p && TREE_STATIC (decl))
6295 expand_static_init (decl, init);
6298 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6299 reference, insert it in the statement-tree now. */
6301 push_cleanup (decl, cleanup, false);
6304 TREE_READONLY (decl) = 1;
6307 /* Returns a declaration for a VAR_DECL as if:
6309 extern "C" TYPE NAME;
6311 had been seen. Used to create compiler-generated global
6315 declare_global_var (tree name, tree type)
6319 push_to_top_level ();
6320 decl = build_decl (input_location, VAR_DECL, name, type);
6321 TREE_PUBLIC (decl) = 1;
6322 DECL_EXTERNAL (decl) = 1;
6323 DECL_ARTIFICIAL (decl) = 1;
6324 /* If the user has explicitly declared this variable (perhaps
6325 because the code we are compiling is part of a low-level runtime
6326 library), then it is possible that our declaration will be merged
6327 with theirs by pushdecl. */
6328 decl = pushdecl (decl);
6329 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6330 pop_from_top_level ();
6335 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6336 if "__cxa_atexit" is not being used) corresponding to the function
6337 to be called when the program exits. */
6340 get_atexit_fn_ptr_type (void)
6344 if (!atexit_fn_ptr_type_node)
6347 if (flag_use_cxa_atexit
6348 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6349 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6350 arg_type = ptr_type_node;
6352 /* The parameter to "atexit" is "void (*)(void)". */
6353 arg_type = NULL_TREE;
6355 fn_type = build_function_type_list (void_type_node,
6356 arg_type, NULL_TREE);
6357 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6360 return atexit_fn_ptr_type_node;
6363 /* Returns a pointer to the `atexit' function. Note that if
6364 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6365 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6368 get_atexit_node (void)
6374 bool use_aeabi_atexit;
6379 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6381 /* The declaration for `__cxa_atexit' is:
6383 int __cxa_atexit (void (*)(void *), void *, void *)
6385 We build up the argument types and then the function type
6387 tree argtype0, argtype1, argtype2;
6389 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6390 /* First, build the pointer-to-function type for the first
6392 fn_ptr_type = get_atexit_fn_ptr_type ();
6393 /* Then, build the rest of the argument types. */
6394 argtype2 = ptr_type_node;
6395 if (use_aeabi_atexit)
6397 argtype1 = fn_ptr_type;
6398 argtype0 = ptr_type_node;
6402 argtype1 = ptr_type_node;
6403 argtype0 = fn_ptr_type;
6405 /* And the final __cxa_atexit type. */
6406 fn_type = build_function_type_list (integer_type_node,
6407 argtype0, argtype1, argtype2,
6409 fn_ptr_type = build_pointer_type (fn_type);
6410 if (use_aeabi_atexit)
6411 name = "__aeabi_atexit";
6413 name = "__cxa_atexit";
6417 /* The declaration for `atexit' is:
6419 int atexit (void (*)());
6421 We build up the argument types and then the function type
6423 fn_ptr_type = get_atexit_fn_ptr_type ();
6424 /* Build the final atexit type. */
6425 fn_type = build_function_type_list (integer_type_node,
6426 fn_ptr_type, NULL_TREE);
6430 /* Now, build the function declaration. */
6431 push_lang_context (lang_name_c);
6432 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6433 mark_used (atexit_fndecl);
6434 pop_lang_context ();
6435 atexit_node = decay_conversion (atexit_fndecl);
6440 /* Returns the __dso_handle VAR_DECL. */
6443 get_dso_handle_node (void)
6445 if (dso_handle_node)
6446 return dso_handle_node;
6448 /* Declare the variable. */
6449 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6452 #ifdef HAVE_GAS_HIDDEN
6453 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6454 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6457 return dso_handle_node;
6460 /* Begin a new function with internal linkage whose job will be simply
6461 to destroy some particular variable. */
6463 static GTY(()) int start_cleanup_cnt;
6466 start_cleanup_fn (void)
6471 bool use_cxa_atexit = flag_use_cxa_atexit
6472 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6474 push_to_top_level ();
6476 /* No need to mangle this. */
6477 push_lang_context (lang_name_c);
6479 /* Build the name of the function. */
6480 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6481 /* Build the function declaration. */
6482 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6483 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6484 /* It's a function with internal linkage, generated by the
6486 TREE_PUBLIC (fndecl) = 0;
6487 DECL_ARTIFICIAL (fndecl) = 1;
6488 /* Make the function `inline' so that it is only emitted if it is
6489 actually needed. It is unlikely that it will be inlined, since
6490 it is only called via a function pointer, but we avoid unnecessary
6491 emissions this way. */
6492 DECL_DECLARED_INLINE_P (fndecl) = 1;
6493 DECL_INTERFACE_KNOWN (fndecl) = 1;
6494 /* Build the parameter. */
6499 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6500 DECL_CONTEXT (parmdecl) = fndecl;
6501 TREE_USED (parmdecl) = 1;
6502 DECL_READ_P (parmdecl) = 1;
6503 DECL_ARGUMENTS (fndecl) = parmdecl;
6507 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6509 pop_lang_context ();
6511 return current_function_decl;
6514 /* Finish the cleanup function begun by start_cleanup_fn. */
6517 end_cleanup_fn (void)
6519 expand_or_defer_fn (finish_function (0));
6521 pop_from_top_level ();
6524 /* Generate code to handle the destruction of DECL, an object with
6525 static storage duration. */
6528 register_dtor_fn (tree decl)
6535 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6537 type = TREE_TYPE (decl);
6538 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6539 return void_zero_node;
6541 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6542 a class object, we can just pass the destructor to
6543 "__cxa_atexit"; we don't have to build a temporary function to do
6545 use_dtor = (flag_use_cxa_atexit
6546 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6547 && CLASS_TYPE_P (type));
6552 /* Find the destructor. */
6553 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6554 gcc_assert (idx >= 0);
6555 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6556 /* Make sure it is accessible. */
6557 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6561 /* Call build_cleanup before we enter the anonymous function so
6562 that any access checks will be done relative to the current
6563 scope, rather than the scope of the anonymous function. */
6564 build_cleanup (decl);
6566 /* Now start the function. */
6567 cleanup = start_cleanup_fn ();
6569 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6570 to the original function, rather than the anonymous one. That
6571 will make the back end think that nested functions are in use,
6572 which causes confusion. */
6573 push_deferring_access_checks (dk_no_check);
6574 fcall = build_cleanup (decl);
6575 pop_deferring_access_checks ();
6577 /* Create the body of the anonymous function. */
6578 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6579 finish_expr_stmt (fcall);
6580 finish_compound_stmt (compound_stmt);
6584 /* Call atexit with the cleanup function. */
6585 mark_used (cleanup);
6586 cleanup = build_address (cleanup);
6587 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6593 /* We must convert CLEANUP to the type that "__cxa_atexit"
6595 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6596 /* "__cxa_atexit" will pass the address of DECL to the
6597 cleanup function. */
6599 addr = build_address (decl);
6600 /* The declared type of the parameter to "__cxa_atexit" is
6601 "void *". For plain "T*", we could just let the
6602 machinery in cp_build_function_call convert it -- but if the
6603 type is "cv-qualified T *", then we need to convert it
6604 before passing it in, to avoid spurious errors. */
6605 addr = build_nop (ptr_type_node, addr);
6608 /* Since the cleanup functions we build ignore the address
6609 they're given, there's no reason to pass the actual address
6610 in, and, in general, it's cheaper to pass NULL than any
6612 addr = null_pointer_node;
6613 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6614 tf_warning_or_error);
6615 if (targetm.cxx.use_aeabi_atexit ())
6628 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6629 arg0, arg1, arg2, NULL_TREE);
6632 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6633 is its initializer. Generate code to handle the construction
6634 and destruction of DECL. */
6637 expand_static_init (tree decl, tree init)
6639 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6640 gcc_assert (TREE_STATIC (decl));
6642 /* Some variables require no dynamic initialization. */
6644 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6647 if (DECL_FUNCTION_SCOPE_P (decl))
6649 /* Emit code to perform this initialization but once. */
6650 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6651 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6652 tree guard, guard_addr;
6653 tree acquire_fn, release_fn, abort_fn;
6656 /* Emit code to perform this initialization but once. This code
6659 static <type> guard;
6660 if (!guard.first_byte) {
6661 if (__cxa_guard_acquire (&guard)) {
6664 // Do initialization.
6665 flag = true; __cxa_guard_release (&guard);
6666 // Register variable for destruction at end of program.
6668 if (!flag) __cxa_guard_abort (&guard);
6672 Note that the `flag' variable is only set to 1 *after* the
6673 initialization is complete. This ensures that an exception,
6674 thrown during the construction, will cause the variable to
6675 reinitialized when we pass through this code again, as per:
6679 If the initialization exits by throwing an exception, the
6680 initialization is not complete, so it will be tried again
6681 the next time control enters the declaration.
6683 This process should be thread-safe, too; multiple threads
6684 should not be able to initialize the variable more than
6687 /* Create the guard variable. */
6688 guard = get_guard (decl);
6690 /* This optimization isn't safe on targets with relaxed memory
6691 consistency. On such targets we force synchronization in
6692 __cxa_guard_acquire. */
6693 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6695 /* Begin the conditional initialization. */
6696 if_stmt = begin_if_stmt ();
6697 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6698 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6701 if (flag_threadsafe_statics)
6703 guard_addr = build_address (guard);
6705 acquire_fn = get_identifier ("__cxa_guard_acquire");
6706 release_fn = get_identifier ("__cxa_guard_release");
6707 abort_fn = get_identifier ("__cxa_guard_abort");
6708 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6710 tree vfntype = build_function_type_list (void_type_node,
6711 TREE_TYPE (guard_addr),
6713 acquire_fn = push_library_fn
6714 (acquire_fn, build_function_type_list (integer_type_node,
6715 TREE_TYPE (guard_addr),
6718 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6719 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6723 release_fn = identifier_global_value (release_fn);
6724 abort_fn = identifier_global_value (abort_fn);
6727 inner_if_stmt = begin_if_stmt ();
6728 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6731 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6732 begin = get_target_expr (boolean_false_node);
6733 flag = TARGET_EXPR_SLOT (begin);
6735 TARGET_EXPR_CLEANUP (begin)
6736 = build3 (COND_EXPR, void_type_node, flag,
6738 build_call_n (abort_fn, 1, guard_addr));
6739 CLEANUP_EH_ONLY (begin) = 1;
6741 /* Do the initialization itself. */
6742 init = add_stmt_to_compound (begin, init);
6743 init = add_stmt_to_compound
6744 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6745 init = add_stmt_to_compound
6746 (init, build_call_n (release_fn, 1, guard_addr));
6749 init = add_stmt_to_compound (init, set_guard (guard));
6751 /* Use atexit to register a function for destroying this static
6753 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6755 finish_expr_stmt (init);
6757 if (flag_threadsafe_statics)
6759 finish_compound_stmt (inner_then_clause);
6760 finish_then_clause (inner_if_stmt);
6761 finish_if_stmt (inner_if_stmt);
6764 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6766 finish_compound_stmt (then_clause);
6767 finish_then_clause (if_stmt);
6768 finish_if_stmt (if_stmt);
6772 static_aggregates = tree_cons (init, decl, static_aggregates);
6776 /* Make TYPE a complete type based on INITIAL_VALUE.
6777 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6778 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6779 3 if the initializer list is empty (in pedantic mode). */
6782 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6785 tree type, elt_type;
6789 unsigned HOST_WIDE_INT i;
6792 /* An array of character type can be initialized from a
6793 brace-enclosed string constant.
6795 FIXME: this code is duplicated from reshape_init. Probably
6796 we should just call reshape_init here? */
6797 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6798 && TREE_CODE (initial_value) == CONSTRUCTOR
6799 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6801 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6802 tree value = VEC_index (constructor_elt, v, 0)->value;
6804 if (TREE_CODE (value) == STRING_CST
6805 && VEC_length (constructor_elt, v) == 1)
6806 initial_value = value;
6809 /* If any of the elements are parameter packs, we can't actually
6810 complete this type now because the array size is dependent. */
6811 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6813 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6816 if (PACK_EXPANSION_P (value))
6822 failure = complete_array_type (ptype, initial_value, do_default);
6824 /* We can create the array before the element type is complete, which
6825 means that we didn't have these two bits set in the original type
6826 either. In completing the type, we are expected to propagate these
6827 bits. See also complete_type which does the same thing for arrays
6830 if (TYPE_DOMAIN (type))
6832 elt_type = TREE_TYPE (type);
6833 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6834 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6835 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6841 /* As above, but either give an error or reject zero-size arrays, depending
6845 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6846 bool do_default, tsubst_flags_t complain)
6849 bool sfinae = !(complain & tf_error);
6850 /* In SFINAE context we can't be lenient about zero-size arrays. */
6853 failure = cp_complete_array_type (ptype, initial_value, do_default);
6859 /* Not an error. */;
6860 else if (failure == 1)
6861 error ("initializer fails to determine size of %qT", *ptype);
6862 else if (failure == 2)
6865 error ("array size missing in %qT", *ptype);
6867 else if (failure == 3)
6868 error ("zero-size array %qT", *ptype);
6869 *ptype = error_mark_node;
6874 /* Return zero if something is declared to be a member of type
6875 CTYPE when in the context of CUR_TYPE. STRING is the error
6876 message to print in that case. Otherwise, quietly return 1. */
6879 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6881 if (ctype && ctype != cur_type)
6883 if (flags == DTOR_FLAG)
6884 error ("destructor for alien class %qT cannot be a member", ctype);
6886 error ("constructor for alien class %qT cannot be a member", ctype);
6892 /* Subroutine of `grokdeclarator'. */
6894 /* Generate errors possibly applicable for a given set of specifiers.
6895 This is for ARM $7.1.2. */
6898 bad_specifiers (tree object,
6899 enum bad_spec_place type,
6910 error ("%qD declared as a %<virtual%> variable", object);
6912 error ("%qD declared as an %<inline%> variable", object);
6914 error ("%<const%> and %<volatile%> function specifiers on "
6915 "%qD invalid in variable declaration", object);
6919 error ("%qD declared as a %<virtual%> parameter", object);
6921 error ("%qD declared as an %<inline%> parameter", object);
6923 error ("%<const%> and %<volatile%> function specifiers on "
6924 "%qD invalid in parameter declaration", object);
6928 error ("%qD declared as a %<virtual%> type", object);
6930 error ("%qD declared as an %<inline%> type", object);
6932 error ("%<const%> and %<volatile%> function specifiers on "
6933 "%qD invalid in type declaration", object);
6937 error ("%qD declared as a %<virtual%> field", object);
6939 error ("%qD declared as an %<inline%> field", object);
6941 error ("%<const%> and %<volatile%> function specifiers on "
6942 "%qD invalid in field declaration", object);
6948 error ("%q+D declared as a friend", object);
6950 && (TREE_CODE (object) == TYPE_DECL
6951 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6952 && !TYPE_REFFN_P (TREE_TYPE (object))
6953 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6954 error ("%q+D declared with an exception specification", object);
6957 /* DECL is a member function or static data member and is presently
6958 being defined. Check that the definition is taking place in a
6962 check_class_member_definition_namespace (tree decl)
6964 /* These checks only apply to member functions and static data
6966 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6967 || TREE_CODE (decl) == VAR_DECL);
6968 /* We check for problems with specializations in pt.c in
6969 check_specialization_namespace, where we can issue better
6971 if (processing_specialization)
6973 /* There are no restrictions on the placement of
6974 explicit instantiations. */
6975 if (processing_explicit_instantiation)
6979 A member function definition that appears outside of the
6980 class definition shall appear in a namespace scope enclosing
6981 the class definition.
6985 The definition for a static data member shall appear in a
6986 namespace scope enclosing the member's class definition. */
6987 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6988 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6989 decl, DECL_CONTEXT (decl));
6992 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6993 METHOD_TYPE for a non-static member function; QUALS are the
6994 cv-qualifiers that apply to the function. */
6997 build_this_parm (tree type, cp_cv_quals quals)
7002 cp_cv_quals this_quals;
7004 this_type = type_of_this_parm (type);
7005 /* The `this' parameter is implicitly `const'; it cannot be
7007 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7008 qual_type = cp_build_qualified_type (this_type, this_quals);
7009 parm = build_artificial_parm (this_identifier, qual_type);
7010 cp_apply_type_quals_to_decl (this_quals, parm);
7014 /* DECL is a static member function. Complain if it was declared
7015 with function-cv-quals. */
7018 check_static_quals (tree decl, cp_cv_quals quals)
7020 if (quals != TYPE_UNQUALIFIED)
7021 error ("static member function %q#D declared with type qualifiers",
7025 /* CTYPE is class type, or null if non-class.
7026 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7028 DECLARATOR is the function's name.
7029 PARMS is a chain of PARM_DECLs for the function.
7030 VIRTUALP is truthvalue of whether the function is virtual or not.
7031 FLAGS are to be passed through to `grokclassfn'.
7032 QUALS are qualifiers indicating whether the function is `const'
7034 RAISES is a list of exceptions that this function can raise.
7035 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7036 not look, and -1 if we should not call `grokclassfn' at all.
7038 SFK is the kind of special function (if any) for the new function.
7040 Returns `NULL_TREE' if something goes wrong, after issuing
7041 applicable error messages. */
7044 grokfndecl (tree ctype,
7048 tree orig_declarator,
7050 enum overload_flags flags,
7057 special_function_kind sfk,
7062 location_t location)
7065 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7069 type = build_exception_variant (type, raises);
7071 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7073 /* If we have an explicit location, use it, otherwise use whatever
7074 build_lang_decl used (probably input_location). */
7075 if (location != UNKNOWN_LOCATION)
7076 DECL_SOURCE_LOCATION (decl) = location;
7078 if (TREE_CODE (type) == METHOD_TYPE)
7081 parm = build_this_parm (type, quals);
7082 DECL_CHAIN (parm) = parms;
7085 DECL_ARGUMENTS (decl) = parms;
7086 for (t = parms; t; t = DECL_CHAIN (t))
7087 DECL_CONTEXT (t) = decl;
7088 /* Propagate volatile out from type to decl. */
7089 if (TYPE_VOLATILE (type))
7090 TREE_THIS_VOLATILE (decl) = 1;
7092 /* Setup decl according to sfk. */
7095 case sfk_constructor:
7096 case sfk_copy_constructor:
7097 case sfk_move_constructor:
7098 DECL_CONSTRUCTOR_P (decl) = 1;
7100 case sfk_destructor:
7101 DECL_DESTRUCTOR_P (decl) = 1;
7107 /* If pointers to member functions use the least significant bit to
7108 indicate whether a function is virtual, ensure a pointer
7109 to this function will have that bit clear. */
7110 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7111 && TREE_CODE (type) == METHOD_TYPE
7112 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7113 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7116 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7120 ("defining explicit specialization %qD in friend declaration",
7124 tree fns = TREE_OPERAND (orig_declarator, 0);
7125 tree args = TREE_OPERAND (orig_declarator, 1);
7127 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7129 /* Something like `template <class T> friend void f<T>()'. */
7130 error ("invalid use of template-id %qD in declaration "
7131 "of primary template",
7137 /* A friend declaration of the form friend void f<>(). Record
7138 the information in the TEMPLATE_ID_EXPR. */
7139 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7141 if (TREE_CODE (fns) == COMPONENT_REF)
7143 /* Due to bison parser ickiness, we will have already looked
7144 up an operator_name or PFUNCNAME within the current class
7145 (see template_id in parse.y). If the current class contains
7146 such a name, we'll get a COMPONENT_REF here. Undo that. */
7148 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7149 == current_class_type);
7150 fns = TREE_OPERAND (fns, 1);
7152 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7153 || TREE_CODE (fns) == OVERLOAD);
7154 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7156 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7157 if (TREE_PURPOSE (t)
7158 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7160 error ("default arguments are not allowed in declaration "
7161 "of friend template specialization %qD",
7168 error ("%<inline%> is not allowed in declaration of friend "
7169 "template specialization %qD",
7176 /* If this decl has namespace scope, set that up. */
7178 set_decl_namespace (decl, in_namespace, friendp);
7180 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7182 /* `main' and builtins have implicit 'C' linkage. */
7183 if ((MAIN_NAME_P (declarator)
7184 || (IDENTIFIER_LENGTH (declarator) > 10
7185 && IDENTIFIER_POINTER (declarator)[0] == '_'
7186 && IDENTIFIER_POINTER (declarator)[1] == '_'
7187 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7188 && current_lang_name == lang_name_cplusplus
7189 && ctype == NULL_TREE
7190 && DECL_FILE_SCOPE_P (decl))
7191 SET_DECL_LANGUAGE (decl, lang_c);
7193 /* Should probably propagate const out from type to decl I bet (mrs). */
7196 DECL_STATIC_FUNCTION_P (decl) = 1;
7197 DECL_CONTEXT (decl) = ctype;
7202 DECL_CONTEXT (decl) = ctype;
7204 check_class_member_definition_namespace (decl);
7207 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7209 if (processing_template_decl)
7210 error ("cannot declare %<::main%> to be a template");
7212 error ("cannot declare %<::main%> to be inline");
7214 error ("cannot declare %<::main%> to be static");
7219 /* Members of anonymous types and local classes have no linkage; make
7220 them internal. If a typedef is made later, this will be changed. */
7221 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7222 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7225 if (publicp && cxx_dialect == cxx98)
7227 /* [basic.link]: A name with no linkage (notably, the name of a class
7228 or enumeration declared in a local scope) shall not be used to
7229 declare an entity with linkage.
7231 DR 757 relaxes this restriction for C++0x. */
7232 t = no_linkage_check (TREE_TYPE (decl),
7233 /*relaxed_p=*/false);
7236 if (TYPE_ANONYMOUS_P (t))
7238 if (DECL_EXTERN_C_P (decl))
7239 /* Allow this; it's pretty common in C. */;
7242 permerror (input_location, "anonymous type with no linkage "
7243 "used to declare function %q#D with linkage",
7245 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7246 permerror (input_location, "%q+#D does not refer to the unqualified "
7247 "type, so it is not used for linkage",
7252 permerror (input_location, "type %qT with no linkage used to "
7253 "declare function %q#D with linkage", t, decl);
7257 TREE_PUBLIC (decl) = publicp;
7260 DECL_INTERFACE_KNOWN (decl) = 1;
7261 DECL_NOT_REALLY_EXTERN (decl) = 1;
7264 /* If the declaration was declared inline, mark it as such. */
7266 DECL_DECLARED_INLINE_P (decl) = 1;
7268 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7270 DECL_EXTERNAL (decl) = 1;
7271 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7274 ? G_("static member function %qD cannot have cv-qualifier")
7275 : G_("non-member function %qD cannot have cv-qualifier"),
7277 quals = TYPE_UNQUALIFIED;
7280 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7281 && !grok_op_properties (decl, /*complain=*/true))
7285 /* Make the init_value nonzero so pushdecl knows this is not
7286 tentative. error_mark_node is replaced later with the BLOCK. */
7287 DECL_INITIAL (decl) = error_mark_node;
7289 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7290 TREE_NOTHROW (decl) = 1;
7292 /* Caller will do the rest of this. */
7296 if (ctype != NULL_TREE)
7297 grokclassfn (ctype, decl, flags);
7299 decl = check_explicit_specialization (orig_declarator, decl,
7302 4 * (friendp != 0));
7303 if (decl == error_mark_node)
7306 if (DECL_STATIC_FUNCTION_P (decl))
7307 check_static_quals (decl, quals);
7311 cplus_decl_attributes (&decl, *attrlist, 0);
7312 *attrlist = NULL_TREE;
7315 /* Check main's type after attributes have been applied. */
7316 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7318 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7321 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7323 error ("%<::main%> must return %<int%>");
7324 newtype = build_function_type (integer_type_node, oldtypeargs);
7325 TREE_TYPE (decl) = newtype;
7328 check_main_parameter_types (decl);
7331 if (ctype != NULL_TREE
7332 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7335 tree old_decl = check_classfn (ctype, decl,
7336 (processing_template_decl
7337 > template_class_depth (ctype))
7338 ? current_template_parms
7341 if (old_decl == error_mark_node)
7349 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7350 /* Because grokfndecl is always supposed to return a
7351 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7352 here. We depend on our callers to figure out that its
7353 really a template that's being returned. */
7354 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7356 if (DECL_STATIC_FUNCTION_P (old_decl)
7357 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7359 /* Remove the `this' parm added by grokclassfn. */
7360 revert_static_member_fn (decl);
7361 check_static_quals (decl, quals);
7363 if (DECL_ARTIFICIAL (old_decl))
7365 error ("definition of implicitly-declared %qD", old_decl);
7369 /* Since we've smashed OLD_DECL to its
7370 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7371 if (TREE_CODE (decl) == TEMPLATE_DECL)
7372 decl = DECL_TEMPLATE_RESULT (decl);
7374 /* Attempt to merge the declarations. This can fail, in
7375 the case of some invalid specialization declarations. */
7376 pushed_scope = push_scope (ctype);
7377 ok = duplicate_decls (decl, old_decl, friendp);
7379 pop_scope (pushed_scope);
7382 error ("no %q#D member function declared in class %qT",
7390 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7393 if (ctype == NULL_TREE || check)
7397 DECL_VIRTUAL_P (decl) = 1;
7402 /* decl is a FUNCTION_DECL.
7403 specifiers are the parsed virt-specifiers.
7405 Set flags to reflect the virt-specifiers.
7410 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7412 if (decl == NULL_TREE)
7414 if (specifiers & VIRT_SPEC_OVERRIDE)
7415 DECL_OVERRIDE_P (decl) = 1;
7416 if (specifiers & VIRT_SPEC_FINAL)
7417 DECL_FINAL_P (decl) = 1;
7421 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7422 the linkage that DECL will receive in the object file. */
7425 set_linkage_for_static_data_member (tree decl)
7427 /* A static data member always has static storage duration and
7428 external linkage. Note that static data members are forbidden in
7429 local classes -- the only situation in which a class has
7430 non-external linkage. */
7431 TREE_PUBLIC (decl) = 1;
7432 TREE_STATIC (decl) = 1;
7433 /* For non-template classes, static data members are always put
7434 out in exactly those files where they are defined, just as
7435 with ordinary namespace-scope variables. */
7436 if (!processing_template_decl)
7437 DECL_INTERFACE_KNOWN (decl) = 1;
7440 /* Create a VAR_DECL named NAME with the indicated TYPE.
7442 If SCOPE is non-NULL, it is the class type or namespace containing
7443 the variable. If SCOPE is NULL, the variable should is created in
7444 the innermost enclosings scope. */
7447 grokvardecl (tree type,
7449 const cp_decl_specifier_seq *declspecs,
7455 tree explicit_scope;
7457 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7459 /* Compute the scope in which to place the variable, but remember
7460 whether or not that scope was explicitly specified by the user. */
7461 explicit_scope = scope;
7464 /* An explicit "extern" specifier indicates a namespace-scope
7466 if (declspecs->storage_class == sc_extern)
7467 scope = current_decl_namespace ();
7468 else if (!at_function_scope_p ())
7469 scope = current_scope ();
7473 && (/* If the variable is a namespace-scope variable declared in a
7474 template, we need DECL_LANG_SPECIFIC. */
7475 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7476 /* Similarly for namespace-scope variables with language linkage
7478 || (TREE_CODE (scope) == NAMESPACE_DECL
7479 && current_lang_name != lang_name_cplusplus)
7480 /* Similarly for static data members. */
7482 decl = build_lang_decl (VAR_DECL, name, type);
7484 decl = build_decl (input_location, VAR_DECL, name, type);
7486 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7487 set_decl_namespace (decl, explicit_scope, 0);
7489 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7491 if (declspecs->storage_class == sc_extern)
7493 DECL_THIS_EXTERN (decl) = 1;
7494 DECL_EXTERNAL (decl) = !initialized;
7497 if (DECL_CLASS_SCOPE_P (decl))
7499 set_linkage_for_static_data_member (decl);
7500 /* This function is only called with out-of-class definitions. */
7501 DECL_EXTERNAL (decl) = 0;
7502 check_class_member_definition_namespace (decl);
7504 /* At top level, either `static' or no s.c. makes a definition
7505 (perhaps tentative), and absence of `static' makes it public. */
7506 else if (toplevel_bindings_p ())
7508 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7509 && (DECL_THIS_EXTERN (decl) || ! constp));
7510 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7512 /* Not at top level, only `static' makes a static definition. */
7515 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7516 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7519 if (declspecs->specs[(int)ds_thread])
7520 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7522 /* If the type of the decl has no linkage, make sure that we'll
7523 notice that in mark_used. */
7524 if (cxx_dialect > cxx98
7525 && decl_linkage (decl) != lk_none
7526 && DECL_LANG_SPECIFIC (decl) == NULL
7527 && !DECL_EXTERN_C_P (decl)
7528 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7529 retrofit_lang_decl (decl);
7531 if (TREE_PUBLIC (decl))
7533 /* [basic.link]: A name with no linkage (notably, the name of a class
7534 or enumeration declared in a local scope) shall not be used to
7535 declare an entity with linkage.
7537 DR 757 relaxes this restriction for C++0x. */
7538 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7539 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7542 if (TYPE_ANONYMOUS_P (t))
7544 if (DECL_EXTERN_C_P (decl))
7545 /* Allow this; it's pretty common in C. */
7549 /* DRs 132, 319 and 389 seem to indicate types with
7550 no linkage can only be used to declare extern "C"
7551 entities. Since it's not always an error in the
7552 ISO C++ 90 Standard, we only issue a warning. */
7553 warning (0, "anonymous type with no linkage used to declare "
7554 "variable %q#D with linkage", decl);
7555 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7556 warning (0, "%q+#D does not refer to the unqualified "
7557 "type, so it is not used for linkage",
7562 warning (0, "type %qT with no linkage used to declare variable "
7563 "%q#D with linkage", t, decl);
7567 DECL_INTERFACE_KNOWN (decl) = 1;
7572 /* Create and return a canonical pointer to member function type, for
7573 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7576 build_ptrmemfunc_type (tree type)
7580 tree unqualified_variant = NULL_TREE;
7582 if (type == error_mark_node)
7585 /* If a canonical type already exists for this type, use it. We use
7586 this method instead of type_hash_canon, because it only does a
7587 simple equality check on the list of field members. */
7589 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7592 /* Make sure that we always have the unqualified pointer-to-member
7594 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7596 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7598 t = make_class_type (RECORD_TYPE);
7599 xref_basetypes (t, NULL_TREE);
7601 /* Let the front end know this is a pointer to member function... */
7602 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7603 /* ... and not really a class type. */
7604 SET_CLASS_TYPE_P (t, 0);
7606 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7609 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7611 DECL_CHAIN (field) = fields;
7614 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7616 /* Zap out the name so that the back end will give us the debugging
7617 information for this anonymous RECORD_TYPE. */
7618 TYPE_NAME (t) = NULL_TREE;
7620 /* If this is not the unqualified form of this pointer-to-member
7621 type, set the TYPE_MAIN_VARIANT for this type to be the
7622 unqualified type. Since they are actually RECORD_TYPEs that are
7623 not variants of each other, we must do this manually.
7624 As we just built a new type there is no need to do yet another copy. */
7625 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7627 int type_quals = cp_type_quals (type);
7628 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7629 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7630 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7631 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7632 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7633 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7634 TREE_TYPE (TYPE_BINFO (t)) = t;
7637 /* Cache this pointer-to-member type so that we can find it again
7639 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7641 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7642 SET_TYPE_STRUCTURAL_EQUALITY (t);
7643 else if (TYPE_CANONICAL (type) != type)
7644 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7649 /* Create and return a pointer to data member type. */
7652 build_ptrmem_type (tree class_type, tree member_type)
7654 if (TREE_CODE (member_type) == METHOD_TYPE)
7656 cp_cv_quals quals = type_memfn_quals (member_type);
7657 member_type = build_memfn_type (member_type, class_type, quals);
7658 return build_ptrmemfunc_type (build_pointer_type (member_type));
7662 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7663 return build_offset_type (class_type, member_type);
7667 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7668 Check to see that the definition is valid. Issue appropriate error
7669 messages. Return 1 if the definition is particularly bad, or 0
7673 check_static_variable_definition (tree decl, tree type)
7675 /* Can't check yet if we don't know the type. */
7676 if (dependent_type_p (type))
7678 /* If DECL is declared constexpr, we'll do the appropriate checks
7679 in check_initializer. */
7680 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7682 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7684 if (literal_type_p (type))
7685 error ("%<constexpr%> needed for in-class initialization of static "
7686 "data member %q#D of non-integral type", decl);
7688 error ("in-class initialization of static data member %q#D of "
7689 "non-literal type", decl);
7693 /* Motion 10 at San Diego: If a static const integral data member is
7694 initialized with an integral constant expression, the initializer
7695 may appear either in the declaration (within the class), or in
7696 the definition, but not both. If it appears in the class, the
7697 member is a member constant. The file-scope definition is always
7699 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7701 error ("invalid in-class initialization of static data member "
7702 "of non-integral type %qT",
7706 else if (!CP_TYPE_CONST_P (type))
7707 error ("ISO C++ forbids in-class initialization of non-const "
7708 "static member %qD",
7710 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7711 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7712 "%qD of non-integral type %qT", decl, type);
7717 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7718 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7719 expressions out into temporary variables so that walk_tree doesn't
7720 step into them (c++/15764). */
7723 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7725 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7726 tree expr = *expr_p;
7727 if (TREE_CODE (expr) == SAVE_EXPR)
7729 tree op = TREE_OPERAND (expr, 0);
7730 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7731 if (TREE_SIDE_EFFECTS (op))
7732 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7735 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7740 /* Entry point for the above. */
7743 stabilize_vla_size (tree size)
7745 struct pointer_set_t *pset = pointer_set_create ();
7746 /* Break out any function calls into temporary variables. */
7747 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7750 /* Given the SIZE (i.e., number of elements) in an array, compute an
7751 appropriate index type for the array. If non-NULL, NAME is the
7752 name of the thing being declared. */
7755 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7760 tree abi_1_itype = NULL_TREE;
7762 if (error_operand_p (size))
7763 return error_mark_node;
7765 type = TREE_TYPE (size);
7766 /* type_dependent_expression_p? */
7767 if (!dependent_type_p (type))
7769 mark_rvalue_use (size);
7771 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7772 && TREE_SIDE_EFFECTS (size))
7773 /* In C++98, we mark a non-constant array bound with a magic
7774 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7777 size = fold_non_dependent_expr (size);
7779 if (CLASS_TYPE_P (type)
7780 && CLASSTYPE_LITERAL_P (type))
7782 size = build_expr_type_conversion (WANT_INT, size, true);
7785 if (!(complain & tf_error))
7786 return error_mark_node;
7788 error ("size of array %qD has non-integral type %qT",
7791 error ("size of array has non-integral type %qT", type);
7792 size = integer_one_node;
7794 if (size == error_mark_node)
7795 return error_mark_node;
7796 type = TREE_TYPE (size);
7797 /* We didn't support this case in GCC 3.2, so don't bother
7798 trying to model it now in ABI v1. */
7799 abi_1_itype = error_mark_node;
7802 size = maybe_constant_value (size);
7803 if (!TREE_CONSTANT (size))
7807 if (error_operand_p (size))
7808 return error_mark_node;
7810 /* The array bound must be an integer type. */
7811 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7813 if (!(complain & tf_error))
7814 return error_mark_node;
7816 error ("size of array %qD has non-integral type %qT", name, type);
7818 error ("size of array has non-integral type %qT", type);
7819 size = integer_one_node;
7820 type = TREE_TYPE (size);
7824 /* A type is dependent if it is...an array type constructed from any
7825 dependent type or whose size is specified by a constant expression
7826 that is value-dependent. */
7827 /* We can only call value_dependent_expression_p on integral constant
7828 expressions; treat non-constant expressions as dependent, too. */
7829 if (processing_template_decl
7830 && (dependent_type_p (type)
7831 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7833 /* We cannot do any checking for a SIZE that isn't known to be
7834 constant. Just build the index type and mark that it requires
7835 structural equality checks. */
7836 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7837 size, integer_one_node));
7838 TYPE_DEPENDENT_P (itype) = 1;
7839 TYPE_DEPENDENT_P_VALID (itype) = 1;
7840 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7844 if (!abi_version_at_least (2) && processing_template_decl
7845 && abi_1_itype == NULL_TREE)
7846 /* For abi-1, we handled all instances in templates the same way,
7847 even when they were non-dependent. This affects the manglings
7848 produced. So, we do the normal checking for non-dependent
7849 sizes, but at the end we'll return the same type that abi-1
7850 would have, but with TYPE_CANONICAL set to the "right"
7851 value that the current ABI would provide. */
7852 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7853 osize, integer_one_node));
7855 /* Normally, the array-bound will be a constant. */
7856 if (TREE_CODE (size) == INTEGER_CST)
7858 /* Check to see if the array bound overflowed. Make that an
7859 error, no matter how generous we're being. */
7860 constant_expression_error (size);
7862 /* An array must have a positive number of elements. */
7863 if (INT_CST_LT (size, integer_zero_node))
7865 if (!(complain & tf_error))
7866 return error_mark_node;
7868 error ("size of array %qD is negative", name);
7870 error ("size of array is negative");
7871 size = integer_one_node;
7873 /* As an extension we allow zero-sized arrays. */
7874 else if (integer_zerop (size))
7876 if (!(complain & tf_error))
7877 /* We must fail if performing argument deduction (as
7878 indicated by the state of complain), so that
7879 another substitution can be found. */
7880 return error_mark_node;
7881 else if (in_system_header)
7882 /* Allow them in system headers because glibc uses them. */;
7884 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7886 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7889 else if (TREE_CONSTANT (size)
7890 /* We don't allow VLAs at non-function scopes, or during
7891 tentative template substitution. */
7892 || !at_function_scope_p () || !(complain & tf_error))
7894 if (!(complain & tf_error))
7895 return error_mark_node;
7896 /* `(int) &fn' is not a valid array bound. */
7898 error ("size of array %qD is not an integral constant-expression",
7901 error ("size of array is not an integral constant-expression");
7902 size = integer_one_node;
7904 else if (pedantic && warn_vla != 0)
7907 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7909 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7911 else if (warn_vla > 0)
7915 "variable length array %qD is used", name);
7918 "variable length array is used");
7921 if (processing_template_decl && !TREE_CONSTANT (size))
7922 /* A variable sized array. */
7923 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7926 HOST_WIDE_INT saved_processing_template_decl;
7928 /* Compute the index of the largest element in the array. It is
7929 one less than the number of elements in the array. We save
7930 and restore PROCESSING_TEMPLATE_DECL so that computations in
7931 cp_build_binary_op will be appropriately folded. */
7932 saved_processing_template_decl = processing_template_decl;
7933 processing_template_decl = 0;
7934 itype = cp_build_binary_op (input_location,
7936 cp_convert (ssizetype, size),
7937 cp_convert (ssizetype, integer_one_node),
7938 tf_warning_or_error);
7939 itype = fold (itype);
7940 processing_template_decl = saved_processing_template_decl;
7942 if (!TREE_CONSTANT (itype))
7943 /* A variable sized array. */
7944 itype = variable_size (itype);
7945 /* Make sure that there was no overflow when creating to a signed
7946 index type. (For example, on a 32-bit machine, an array with
7947 size 2^32 - 1 is too big.) */
7948 else if (TREE_CODE (itype) == INTEGER_CST
7949 && TREE_OVERFLOW (itype))
7951 if (!(complain & tf_error))
7952 return error_mark_node;
7953 error ("overflow in array dimension");
7954 TREE_OVERFLOW (itype) = 0;
7958 /* Create and return the appropriate index type. */
7959 if (abi_1_itype && abi_1_itype != error_mark_node)
7961 tree t = build_index_type (itype);
7962 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7963 itype = abi_1_itype;
7966 itype = build_index_type (itype);
7968 /* If the index type were dependent, we would have returned early, so
7969 remember that it isn't. */
7970 TYPE_DEPENDENT_P (itype) = 0;
7971 TYPE_DEPENDENT_P_VALID (itype) = 1;
7975 /* Returns the scope (if any) in which the entity declared by
7976 DECLARATOR will be located. If the entity was declared with an
7977 unqualified name, NULL_TREE is returned. */
7980 get_scope_of_declarator (const cp_declarator *declarator)
7982 while (declarator && declarator->kind != cdk_id)
7983 declarator = declarator->declarator;
7985 /* If the declarator-id is a SCOPE_REF, the scope in which the
7986 declaration occurs is the first operand. */
7988 && declarator->u.id.qualifying_scope)
7989 return declarator->u.id.qualifying_scope;
7991 /* Otherwise, the declarator is not a qualified name; the entity will
7992 be declared in the current scope. */
7996 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7997 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8001 create_array_type_for_decl (tree name, tree type, tree size)
8003 tree itype = NULL_TREE;
8005 /* If things have already gone awry, bail now. */
8006 if (type == error_mark_node || size == error_mark_node)
8007 return error_mark_node;
8009 /* 8.3.4/1: If the type of the identifier of D contains the auto
8010 type-specifier, the program is ill-formed. */
8011 if (pedantic && type_uses_auto (type))
8012 pedwarn (input_location, OPT_pedantic,
8013 "declaration of %qD as array of %<auto%>", name);
8015 /* If there are some types which cannot be array elements,
8016 issue an error-message and return. */
8017 switch (TREE_CODE (type))
8021 error ("declaration of %qD as array of void", name);
8023 error ("creating array of void");
8024 return error_mark_node;
8028 error ("declaration of %qD as array of functions", name);
8030 error ("creating array of functions");
8031 return error_mark_node;
8033 case REFERENCE_TYPE:
8035 error ("declaration of %qD as array of references", name);
8037 error ("creating array of references");
8038 return error_mark_node;
8042 error ("declaration of %qD as array of function members", name);
8044 error ("creating array of function members");
8045 return error_mark_node;
8053 The constant expressions that specify the bounds of the arrays
8054 can be omitted only for the first member of the sequence. */
8055 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8058 error ("declaration of %qD as multidimensional array must "
8059 "have bounds for all dimensions except the first",
8062 error ("multidimensional array must have bounds for all "
8063 "dimensions except the first");
8065 return error_mark_node;
8068 /* Figure out the index type for the array. */
8070 itype = compute_array_index_type (name, size, tf_warning_or_error);
8073 T is called the array element type; this type shall not be [...] an
8074 abstract class type. */
8075 abstract_virtuals_error (name, type);
8077 return build_cplus_array_type (type, itype);
8080 /* Check that it's OK to declare a function with the indicated TYPE.
8081 SFK indicates the kind of special function (if any) that this
8082 function is. OPTYPE is the type given in a conversion operator
8083 declaration, or the class type for a constructor/destructor.
8084 Returns the actual return type of the function; that
8085 may be different than TYPE if an error occurs, or for certain
8086 special functions. */
8089 check_special_function_return_type (special_function_kind sfk,
8095 case sfk_constructor:
8097 error ("return type specification for constructor invalid");
8099 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8100 type = build_pointer_type (optype);
8102 type = void_type_node;
8105 case sfk_destructor:
8107 error ("return type specification for destructor invalid");
8108 /* We can't use the proper return type here because we run into
8109 problems with ambiguous bases and covariant returns.
8110 Java classes are left unchanged because (void *) isn't a valid
8111 Java type, and we don't want to change the Java ABI. */
8112 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8113 type = build_pointer_type (void_type_node);
8115 type = void_type_node;
8118 case sfk_conversion:
8120 error ("return type specified for %<operator %T%>", optype);
8131 /* A variable or data member (whose unqualified name is IDENTIFIER)
8132 has been declared with the indicated TYPE. If the TYPE is not
8133 acceptable, issue an error message and return a type to use for
8134 error-recovery purposes. */
8137 check_var_type (tree identifier, tree type)
8139 if (VOID_TYPE_P (type))
8142 error ("unnamed variable or field declared void");
8143 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8145 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8146 error ("variable or field %qE declared void", identifier);
8149 error ("variable or field declared void");
8150 type = error_mark_node;
8156 /* Given declspecs and a declarator (abstract or otherwise), determine
8157 the name and type of the object declared and construct a DECL node
8160 DECLSPECS points to the representation of declaration-specifier
8161 sequence that precedes declarator.
8163 DECL_CONTEXT says which syntactic context this declaration is in:
8164 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8165 FUNCDEF for a function definition. Like NORMAL but a few different
8166 error messages in each case. Return value may be zero meaning
8167 this definition is too screwy to try to parse.
8168 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8169 handle member functions (which have FIELD context).
8170 Return value may be zero meaning this definition is too screwy to
8172 PARM for a parameter declaration (either within a function prototype
8173 or before a function body). Make a PARM_DECL, or return void_type_node.
8174 TPARM for a template parameter declaration.
8175 CATCHPARM for a parameter declaration before a catch clause.
8176 TYPENAME if for a typename (in a cast or sizeof).
8177 Don't make a DECL node; just return the ..._TYPE node.
8178 FIELD for a struct or union field; make a FIELD_DECL.
8179 BITFIELD for a field with specified width.
8181 INITIALIZED is as for start_decl.
8183 ATTRLIST is a pointer to the list of attributes, which may be NULL
8184 if there are none; *ATTRLIST may be modified if attributes from inside
8185 the declarator should be applied to the declaration.
8187 When this function is called, scoping variables (such as
8188 CURRENT_CLASS_TYPE) should reflect the scope in which the
8189 declaration occurs, not the scope in which the new declaration will
8190 be placed. For example, on:
8194 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8197 Returns a DECL (if a declarator is present), a TYPE (if there is no
8198 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8202 grokdeclarator (const cp_declarator *declarator,
8203 const cp_decl_specifier_seq *declspecs,
8204 enum decl_context decl_context,
8208 tree type = NULL_TREE;
8210 int explicit_int128 = 0;
8211 int virtualp, explicitp, friendp, inlinep, staticp;
8212 int explicit_int = 0;
8213 int explicit_char = 0;
8214 int defaulted_int = 0;
8215 tree dependent_name = NULL_TREE;
8217 tree typedef_decl = NULL_TREE;
8218 const char *name = NULL;
8219 tree typedef_type = NULL_TREE;
8220 /* True if this declarator is a function definition. */
8221 bool funcdef_flag = false;
8222 cp_declarator_kind innermost_code = cdk_error;
8225 /* See the code below that used this. */
8226 tree decl_attr = NULL_TREE;
8229 /* Keep track of what sort of function is being processed
8230 so that we can warn about default return values, or explicit
8231 return values which do not match prescribed defaults. */
8232 special_function_kind sfk = sfk_none;
8234 tree dname = NULL_TREE;
8235 tree ctor_return_type = NULL_TREE;
8236 enum overload_flags flags = NO_SPECIAL;
8237 /* cv-qualifiers that apply to the declarator, for a declaration of
8238 a member function. */
8239 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8240 /* virt-specifiers that apply to the declarator, for a declaration of
8241 a member function. */
8242 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8243 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8245 tree raises = NULL_TREE;
8246 int template_count = 0;
8247 tree returned_attrs = NULL_TREE;
8248 tree parms = NULL_TREE;
8249 const cp_declarator *id_declarator;
8250 /* The unqualified name of the declarator; either an
8251 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8252 tree unqualified_id;
8253 /* The class type, if any, in which this entity is located,
8254 or NULL_TREE if none. Note that this value may be different from
8255 the current class type; for example if an attempt is made to declare
8256 "A::f" inside "B", this value will be "A". */
8257 tree ctype = current_class_type;
8258 /* The NAMESPACE_DECL for the namespace in which this entity is
8259 located. If an unqualified name is used to declare the entity,
8260 this value will be NULL_TREE, even if the entity is located at
8262 tree in_namespace = NULL_TREE;
8263 cp_storage_class storage_class;
8264 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8265 bool type_was_error_mark_node = false;
8266 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8267 bool template_type_arg = false;
8268 bool template_parm_flag = false;
8269 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8272 signed_p = declspecs->specs[(int)ds_signed];
8273 unsigned_p = declspecs->specs[(int)ds_unsigned];
8274 short_p = declspecs->specs[(int)ds_short];
8275 long_p = declspecs->specs[(int)ds_long];
8276 longlong = declspecs->specs[(int)ds_long] >= 2;
8277 explicit_int128 = declspecs->explicit_int128_p;
8278 thread_p = declspecs->specs[(int)ds_thread];
8280 if (decl_context == FUNCDEF)
8281 funcdef_flag = true, decl_context = NORMAL;
8282 else if (decl_context == MEMFUNCDEF)
8283 funcdef_flag = true, decl_context = FIELD;
8284 else if (decl_context == BITFIELD)
8285 bitfield = 1, decl_context = FIELD;
8286 else if (decl_context == TEMPLATE_TYPE_ARG)
8287 template_type_arg = true, decl_context = TYPENAME;
8288 else if (decl_context == TPARM)
8289 template_parm_flag = true, decl_context = PARM;
8291 if (initialized > 1)
8292 funcdef_flag = true;
8294 /* Look inside a declarator for the name being declared
8295 and get it as a string, for an error message. */
8296 for (id_declarator = declarator;
8298 id_declarator = id_declarator->declarator)
8300 if (id_declarator->kind != cdk_id)
8301 innermost_code = id_declarator->kind;
8303 switch (id_declarator->kind)
8306 if (id_declarator->declarator
8307 && id_declarator->declarator->kind == cdk_id)
8309 sfk = id_declarator->declarator->u.id.sfk;
8310 if (sfk == sfk_destructor)
8317 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8318 tree decl = id_declarator->u.id.unqualified_name;
8321 if (qualifying_scope)
8323 if (at_function_scope_p ())
8327 A declarator-id shall not be qualified except
8330 None of the cases are permitted in block
8332 if (qualifying_scope == global_namespace)
8333 error ("invalid use of qualified-name %<::%D%>",
8335 else if (TYPE_P (qualifying_scope))
8336 error ("invalid use of qualified-name %<%T::%D%>",
8337 qualifying_scope, decl);
8339 error ("invalid use of qualified-name %<%D::%D%>",
8340 qualifying_scope, decl);
8341 return error_mark_node;
8343 else if (TYPE_P (qualifying_scope))
8345 ctype = qualifying_scope;
8346 if (!MAYBE_CLASS_TYPE_P (ctype))
8348 error ("%q#T is not a class or a namespace", ctype);
8351 else if (innermost_code != cdk_function
8352 && current_class_type
8353 && !UNIQUELY_DERIVED_FROM_P (ctype,
8354 current_class_type))
8356 error ("type %qT is not derived from type %qT",
8357 ctype, current_class_type);
8358 return error_mark_node;
8361 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8362 in_namespace = qualifying_scope;
8364 switch (TREE_CODE (decl))
8370 if (innermost_code != cdk_function)
8372 error ("declaration of %qD as non-function", decl);
8373 return error_mark_node;
8375 else if (!qualifying_scope
8376 && !(current_class_type && at_class_scope_p ()))
8378 error ("declaration of %qD as non-member", decl);
8379 return error_mark_node;
8382 type = TREE_OPERAND (decl, 0);
8384 type = constructor_name (type);
8385 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8390 case TEMPLATE_ID_EXPR:
8392 tree fns = TREE_OPERAND (decl, 0);
8395 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8397 gcc_assert (is_overloaded_fn (dname));
8398 dname = DECL_NAME (get_first_fn (dname));
8403 case IDENTIFIER_NODE:
8404 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8407 if (C_IS_RESERVED_WORD (dname))
8409 error ("declarator-id missing; using reserved word %qD",
8411 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8413 else if (!IDENTIFIER_TYPENAME_P (dname))
8414 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8417 gcc_assert (flags == NO_SPECIAL);
8418 flags = TYPENAME_FLAG;
8419 ctor_return_type = TREE_TYPE (dname);
8420 sfk = sfk_conversion;
8421 if (is_typename_at_global_scope (dname))
8422 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8424 name = "<invalid operator>";
8441 return error_mark_node;
8446 if (id_declarator->kind == cdk_id)
8452 The declarator in a function-definition shall have the form
8453 D1 ( parameter-declaration-clause) ... */
8454 if (funcdef_flag && innermost_code != cdk_function)
8456 error ("function definition does not declare parameters");
8457 return error_mark_node;
8460 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8461 && innermost_code != cdk_function
8462 && ! (ctype && !declspecs->any_specifiers_p))
8464 error ("declaration of %qD as non-function", dname);
8465 return error_mark_node;
8468 if (dname && IDENTIFIER_OPNAME_P (dname))
8470 if (declspecs->specs[(int)ds_typedef])
8472 error ("declaration of %qD as %<typedef%>", dname);
8473 return error_mark_node;
8475 else if (decl_context == PARM || decl_context == CATCHPARM)
8477 error ("declaration of %qD as parameter", dname);
8478 return error_mark_node;
8482 /* Anything declared one level down from the top level
8483 must be one of the parameters of a function
8484 (because the body is at least two levels down). */
8486 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8487 by not allowing C++ class definitions to specify their parameters
8488 with xdecls (must be spec.d in the parmlist).
8490 Since we now wait to push a class scope until we are sure that
8491 we are in a legitimate method context, we must set oldcname
8492 explicitly (since current_class_name is not yet alive).
8494 We also want to avoid calling this a PARM if it is in a namespace. */
8496 if (decl_context == NORMAL && !toplevel_bindings_p ())
8498 struct cp_binding_level *b = current_binding_level;
8499 current_binding_level = b->level_chain;
8500 if (current_binding_level != 0 && toplevel_bindings_p ())
8501 decl_context = PARM;
8502 current_binding_level = b;
8506 name = decl_context == PARM ? "parameter" : "type name";
8508 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8510 error ("%<constexpr%> cannot appear in a typedef declaration");
8511 return error_mark_node;
8514 /* If there were multiple types specified in the decl-specifier-seq,
8515 issue an error message. */
8516 if (declspecs->multiple_types_p)
8518 error ("two or more data types in declaration of %qs", name);
8519 return error_mark_node;
8522 if (declspecs->conflicting_specifiers_p)
8524 error ("conflicting specifiers in declaration of %qs", name);
8525 return error_mark_node;
8528 /* Extract the basic type from the decl-specifier-seq. */
8529 type = declspecs->type;
8530 if (type == error_mark_node)
8533 type_was_error_mark_node = true;
8535 /* If the entire declaration is itself tagged as deprecated then
8536 suppress reports of deprecated items. */
8537 if (type && TREE_DEPRECATED (type)
8538 && deprecated_state != DEPRECATED_SUPPRESS)
8539 warn_deprecated_use (type, NULL_TREE);
8540 if (type && TREE_CODE (type) == TYPE_DECL)
8542 typedef_decl = type;
8543 type = TREE_TYPE (typedef_decl);
8544 if (TREE_DEPRECATED (type)
8545 && DECL_ARTIFICIAL (typedef_decl)
8546 && deprecated_state != DEPRECATED_SUPPRESS)
8547 warn_deprecated_use (type, NULL_TREE);
8549 /* No type at all: default to `int', and set DEFAULTED_INT
8550 because it was not a user-defined typedef. */
8551 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8553 /* These imply 'int'. */
8554 type = integer_type_node;
8558 explicit_int = declspecs->explicit_int_p;
8559 explicit_char = declspecs->explicit_char_p;
8562 /* See the code below that used this. */
8564 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8566 typedef_type = type;
8569 if (sfk != sfk_conversion)
8570 ctor_return_type = ctype;
8572 if (sfk != sfk_none)
8573 type = check_special_function_return_type (sfk, type,
8575 else if (type == NULL_TREE)
8581 /* We handle `main' specially here, because 'main () { }' is so
8582 common. With no options, it is allowed. With -Wreturn-type,
8583 it is a warning. It is only an error with -pedantic-errors. */
8584 is_main = (funcdef_flag
8585 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8586 && MAIN_NAME_P (dname)
8587 && ctype == NULL_TREE
8588 && in_namespace == NULL_TREE
8589 && current_namespace == global_namespace);
8591 if (type_was_error_mark_node)
8592 /* We've already issued an error, don't complain more. */;
8593 else if (in_system_header || flag_ms_extensions)
8594 /* Allow it, sigh. */;
8596 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8598 pedwarn (input_location, OPT_pedantic,
8599 "ISO C++ forbids declaration of %qs with no type", name);
8601 warning (OPT_Wreturn_type,
8602 "ISO C++ forbids declaration of %qs with no type", name);
8604 type = integer_type_node;
8609 /* Now process the modifiers that were specified
8610 and check for invalid combinations. */
8612 /* Long double is a special combination. */
8613 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8616 type = cp_build_qualified_type (long_double_type_node,
8617 cp_type_quals (type));
8620 /* Check all other uses of type modifiers. */
8622 if (unsigned_p || signed_p || long_p || short_p)
8626 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8627 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8628 else if (signed_p && unsigned_p)
8629 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8630 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8631 error ("%<long long%> invalid for %qs", name);
8632 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8633 error ("%<__int128%> invalid for %qs", name);
8634 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8635 error ("%<long%> invalid for %qs", name);
8636 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8637 error ("%<short%> invalid for %qs", name);
8638 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8639 error ("%<long%> or %<short%> invalid for %qs", name);
8640 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8641 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8642 else if ((long_p || short_p) && explicit_char)
8643 error ("%<long%> or %<short%> specified with char for %qs", name);
8644 else if (long_p && short_p)
8645 error ("%<long%> and %<short%> specified together for %qs", name);
8646 else if (type == char16_type_node || type == char32_type_node)
8648 if (signed_p || unsigned_p)
8649 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8650 else if (short_p || long_p)
8651 error ("%<short%> or %<long%> invalid for %qs", name);
8656 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8658 pedwarn (input_location, OPT_pedantic,
8659 "long, short, signed or unsigned used invalidly for %qs",
8661 if (flag_pedantic_errors)
8664 if (explicit_int128)
8666 if (int128_integer_type_node == NULL_TREE)
8668 error ("%<__int128%> is not supported by this target");
8673 pedwarn (input_location, OPT_pedantic,
8674 "ISO C++ does not support %<__int128%> for %qs",
8676 if (flag_pedantic_errors)
8682 /* Discard the type modifiers if they are invalid. */
8690 explicit_int128 = false;
8694 /* Decide whether an integer type is signed or not.
8695 Optionally treat bitfields as signed by default. */
8699 It is implementation-defined whether a plain (neither
8700 explicitly signed or unsigned) char, short, int, or long
8701 bit-field is signed or unsigned.
8703 Naturally, we extend this to long long as well. Note that
8704 this does not include wchar_t. */
8705 || (bitfield && !flag_signed_bitfields
8707 /* A typedef for plain `int' without `signed' can be
8708 controlled just like plain `int', but a typedef for
8709 `signed int' cannot be so controlled. */
8711 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8712 && TREE_CODE (type) == INTEGER_TYPE
8713 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8715 if (explicit_int128)
8716 type = int128_unsigned_type_node;
8718 type = long_long_unsigned_type_node;
8720 type = long_unsigned_type_node;
8722 type = short_unsigned_type_node;
8723 else if (type == char_type_node)
8724 type = unsigned_char_type_node;
8725 else if (typedef_decl)
8726 type = unsigned_type_for (type);
8728 type = unsigned_type_node;
8730 else if (signed_p && type == char_type_node)
8731 type = signed_char_type_node;
8732 else if (explicit_int128)
8733 type = int128_integer_type_node;
8735 type = long_long_integer_type_node;
8737 type = long_integer_type_node;
8739 type = short_integer_type_node;
8741 if (declspecs->specs[(int)ds_complex])
8743 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8744 error ("complex invalid for %qs", name);
8745 /* If we just have "complex", it is equivalent to
8746 "complex double", but if any modifiers at all are specified it is
8747 the complex form of TYPE. E.g, "complex short" is
8748 "complex short int". */
8749 else if (defaulted_int && ! longlong && ! explicit_int128
8750 && ! (long_p || short_p || signed_p || unsigned_p))
8751 type = complex_double_type_node;
8752 else if (type == integer_type_node)
8753 type = complex_integer_type_node;
8754 else if (type == float_type_node)
8755 type = complex_float_type_node;
8756 else if (type == double_type_node)
8757 type = complex_double_type_node;
8758 else if (type == long_double_type_node)
8759 type = complex_long_double_type_node;
8761 type = build_complex_type (type);
8764 type_quals = TYPE_UNQUALIFIED;
8765 if (declspecs->specs[(int)ds_const])
8766 type_quals |= TYPE_QUAL_CONST;
8767 if (declspecs->specs[(int)ds_volatile])
8768 type_quals |= TYPE_QUAL_VOLATILE;
8769 if (declspecs->specs[(int)ds_restrict])
8770 type_quals |= TYPE_QUAL_RESTRICT;
8771 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8772 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8775 type_quals |= cp_type_quals (type);
8776 type = cp_build_qualified_type_real
8777 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8778 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8779 /* We might have ignored or rejected some of the qualifiers. */
8780 type_quals = cp_type_quals (type);
8783 inlinep = !! declspecs->specs[(int)ds_inline];
8784 virtualp = !! declspecs->specs[(int)ds_virtual];
8785 explicitp = !! declspecs->specs[(int)ds_explicit];
8787 storage_class = declspecs->storage_class;
8788 if (storage_class == sc_static)
8789 staticp = 1 + (decl_context == FIELD);
8791 if (virtualp && staticp == 2)
8793 error ("member %qD cannot be declared both virtual and static", dname);
8794 storage_class = sc_none;
8797 friendp = !! declspecs->specs[(int)ds_friend];
8799 if (dependent_name && !friendp)
8801 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8802 return error_mark_node;
8805 /* Issue errors about use of storage classes for parameters. */
8806 if (decl_context == PARM)
8808 if (declspecs->specs[(int)ds_typedef])
8810 error ("typedef declaration invalid in parameter declaration");
8811 return error_mark_node;
8813 else if (template_parm_flag && storage_class != sc_none)
8815 error ("storage class specified for template parameter %qs", name);
8816 return error_mark_node;
8818 else if (storage_class == sc_static
8819 || storage_class == sc_extern
8821 error ("storage class specifiers invalid in parameter declarations");
8823 /* Function parameters cannot be constexpr. If we saw one, moan
8824 and pretend it wasn't there. */
8827 error ("a parameter cannot be declared %<constexpr%>");
8832 /* Give error if `virtual' is used outside of class declaration. */
8834 && (current_class_name == NULL_TREE || decl_context != FIELD))
8836 error ("%<virtual%> outside class declaration");
8840 /* Static anonymous unions are dealt with here. */
8841 if (staticp && decl_context == TYPENAME
8843 && ANON_AGGR_TYPE_P (declspecs->type))
8844 decl_context = FIELD;
8846 /* Warn about storage classes that are invalid for certain
8847 kinds of declarations (parameters, typenames, etc.). */
8850 && storage_class != sc_extern
8851 && storage_class != sc_static)
8852 || declspecs->specs[(int)ds_typedef]))
8854 error ("multiple storage classes in declaration of %qs", name);
8857 if (decl_context != NORMAL
8858 && ((storage_class != sc_none
8859 && storage_class != sc_mutable)
8862 if ((decl_context == PARM || decl_context == CATCHPARM)
8863 && (storage_class == sc_register
8864 || storage_class == sc_auto))
8866 else if (declspecs->specs[(int)ds_typedef])
8868 else if (decl_context == FIELD
8869 /* C++ allows static class elements. */
8870 && storage_class == sc_static)
8871 /* C++ also allows inlines and signed and unsigned elements,
8872 but in those cases we don't come in here. */
8876 if (decl_context == FIELD)
8877 error ("storage class specified for %qs", name);
8880 if (decl_context == PARM || decl_context == CATCHPARM)
8881 error ("storage class specified for parameter %qs", name);
8883 error ("storage class specified for typename");
8885 if (storage_class == sc_register
8886 || storage_class == sc_auto
8887 || storage_class == sc_extern
8889 storage_class = sc_none;
8892 else if (storage_class == sc_extern && funcdef_flag
8893 && ! toplevel_bindings_p ())
8894 error ("nested function %qs declared %<extern%>", name);
8895 else if (toplevel_bindings_p ())
8897 if (storage_class == sc_auto)
8898 error ("top-level declaration of %qs specifies %<auto%>", name);
8901 && storage_class != sc_extern
8902 && storage_class != sc_static)
8904 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8909 if (storage_class && friendp)
8911 error ("storage class specifiers invalid in friend function declarations");
8912 storage_class = sc_none;
8917 unqualified_id = NULL_TREE;
8920 unqualified_id = id_declarator->u.id.unqualified_name;
8921 switch (TREE_CODE (unqualified_id))
8924 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8925 if (TYPE_P (unqualified_id))
8926 unqualified_id = constructor_name (unqualified_id);
8929 case IDENTIFIER_NODE:
8930 case TEMPLATE_ID_EXPR:
8938 /* Determine the type of the entity declared by recurring on the
8940 for (; declarator; declarator = declarator->declarator)
8942 const cp_declarator *inner_declarator;
8945 if (type == error_mark_node)
8946 return error_mark_node;
8948 attrs = declarator->attributes;
8954 if (declarator == NULL || declarator->kind == cdk_id)
8955 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8956 if (declarator->kind == cdk_function)
8957 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8958 if (declarator->kind == cdk_array)
8959 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8960 returned_attrs = decl_attributes (&type,
8961 chainon (returned_attrs, attrs),
8965 if (declarator->kind == cdk_id)
8968 inner_declarator = declarator->declarator;
8970 switch (declarator->kind)
8973 type = create_array_type_for_decl (dname, type,
8974 declarator->u.array.bounds);
8982 /* Declaring a function type.
8983 Make sure we have a valid type for the function to return. */
8985 if (type_quals != TYPE_UNQUALIFIED)
8987 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8988 warning (OPT_Wignored_qualifiers,
8989 "type qualifiers ignored on function return type");
8990 /* We now know that the TYPE_QUALS don't apply to the
8991 decl, but to its return type. */
8992 type_quals = TYPE_UNQUALIFIED;
8994 errmsg = targetm.invalid_return_type (type);
8998 type = integer_type_node;
9001 /* Error about some types functions can't return. */
9003 if (TREE_CODE (type) == FUNCTION_TYPE)
9005 error ("%qs declared as function returning a function", name);
9006 return error_mark_node;
9008 if (TREE_CODE (type) == ARRAY_TYPE)
9010 error ("%qs declared as function returning an array", name);
9011 return error_mark_node;
9014 /* Pick up type qualifiers which should be applied to `this'. */
9015 memfn_quals = declarator->u.function.qualifiers;
9016 /* Pick up virt-specifiers. */
9017 virt_specifiers = declarator->u.function.virt_specifiers;
9018 /* Pick up the exception specifications. */
9019 raises = declarator->u.function.exception_specification;
9021 /* Say it's a definition only for the CALL_EXPR
9022 closest to the identifier. */
9023 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9025 /* Handle a late-specified return type. */
9028 if (type_uses_auto (type))
9030 if (!declarator->u.function.late_return_type)
9032 error ("%qs function uses %<auto%> type specifier without"
9033 " late return type", name);
9034 return error_mark_node;
9036 else if (!is_auto (type))
9038 error ("%qs function with late return type has"
9039 " %qT as its type rather than plain %<auto%>",
9041 return error_mark_node;
9044 else if (declarator->u.function.late_return_type)
9046 error ("%qs function with late return type not declared"
9047 " with %<auto%> type specifier", name);
9048 return error_mark_node;
9051 type = splice_late_return_type
9052 (type, declarator->u.function.late_return_type);
9053 if (type == error_mark_node)
9054 return error_mark_node;
9056 if (ctype == NULL_TREE
9057 && decl_context == FIELD
9059 && (friendp == 0 || dname == current_class_name))
9060 ctype = current_class_type;
9062 if (ctype && (sfk == sfk_constructor
9063 || sfk == sfk_destructor))
9065 /* We are within a class's scope. If our declarator name
9066 is the same as the class name, and we are defining
9067 a function, then it is a constructor/destructor, and
9068 therefore returns a void type. */
9070 /* ISO C++ 12.4/2. A destructor may not be declared
9071 const or volatile. A destructor may not be
9074 ISO C++ 12.1. A constructor may not be declared
9075 const or volatile. A constructor may not be
9076 virtual. A constructor may not be static. */
9078 error ((flags == DTOR_FLAG)
9079 ? "destructor cannot be static member function"
9080 : "constructor cannot be static member function");
9083 error ((flags == DTOR_FLAG)
9084 ? "destructors may not be cv-qualified"
9085 : "constructors may not be cv-qualified");
9086 memfn_quals = TYPE_UNQUALIFIED;
9089 if (decl_context == FIELD
9090 && !member_function_or_else (ctype,
9093 return error_mark_node;
9095 if (flags != DTOR_FLAG)
9097 /* It's a constructor. */
9102 permerror (input_location, "constructors cannot be declared virtual");
9105 if (decl_context == FIELD
9106 && sfk != sfk_constructor)
9107 return error_mark_node;
9109 if (decl_context == FIELD)
9115 error ("can%'t initialize friend function %qs", name);
9118 /* Cannot be both friend and virtual. */
9119 error ("virtual functions cannot be friends");
9122 if (decl_context == NORMAL)
9123 error ("friend declaration not in class definition");
9124 if (current_function_decl && funcdef_flag)
9125 error ("can%'t define friend function %qs in a local "
9129 else if (ctype && sfk == sfk_conversion)
9133 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9138 arg_types = grokparms (declarator->u.function.parameters,
9141 if (inner_declarator
9142 && inner_declarator->kind == cdk_id
9143 && inner_declarator->u.id.sfk == sfk_destructor
9144 && arg_types != void_list_node)
9146 error ("destructors may not have parameters");
9147 arg_types = void_list_node;
9151 type = build_function_type (type, arg_types);
9158 /* Filter out pointers-to-references and references-to-references.
9159 We can get these if a TYPE_DECL is used. */
9161 if (TREE_CODE (type) == REFERENCE_TYPE)
9163 if (declarator->kind != cdk_reference)
9165 error ("cannot declare pointer to %q#T", type);
9166 type = TREE_TYPE (type);
9169 /* In C++0x, we allow reference to reference declarations
9170 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9171 and template type arguments [14.3.1/4 temp.arg.type]. The
9172 check for direct reference to reference declarations, which
9173 are still forbidden, occurs below. Reasoning behind the change
9174 can be found in DR106, DR540, and the rvalue reference
9176 else if (cxx_dialect == cxx98)
9178 error ("cannot declare reference to %q#T", type);
9179 type = TREE_TYPE (type);
9182 else if (VOID_TYPE_P (type))
9184 if (declarator->kind == cdk_reference)
9185 error ("cannot declare reference to %q#T", type);
9186 else if (declarator->kind == cdk_ptrmem)
9187 error ("cannot declare pointer to %q#T member", type);
9190 /* We now know that the TYPE_QUALS don't apply to the decl,
9191 but to the target of the pointer. */
9192 type_quals = TYPE_UNQUALIFIED;
9194 if (declarator->kind == cdk_ptrmem
9195 && (TREE_CODE (type) == FUNCTION_TYPE
9196 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9198 memfn_quals |= type_memfn_quals (type);
9199 type = build_memfn_type (type,
9200 declarator->u.pointer.class_type,
9202 if (type == error_mark_node)
9203 return error_mark_node;
9204 memfn_quals = TYPE_UNQUALIFIED;
9207 if (TREE_CODE (type) == FUNCTION_TYPE
9208 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9209 error (declarator->kind == cdk_reference
9210 ? G_("cannot declare reference to qualified function type %qT")
9211 : G_("cannot declare pointer to qualified function type %qT"),
9214 /* When the pointed-to type involves components of variable size,
9215 care must be taken to ensure that the size evaluation code is
9216 emitted early enough to dominate all the possible later uses
9217 and late enough for the variables on which it depends to have
9220 This is expected to happen automatically when the pointed-to
9221 type has a name/declaration of it's own, but special attention
9222 is required if the type is anonymous.
9224 We handle the NORMAL and FIELD contexts here by inserting a
9225 dummy statement that just evaluates the size at a safe point
9226 and ensures it is not deferred until e.g. within a deeper
9227 conditional context (c++/43555).
9229 We expect nothing to be needed here for PARM or TYPENAME.
9230 Evaluating the size at this point for TYPENAME would
9231 actually be incorrect, as we might be in the middle of an
9232 expression with side effects on the pointed-to type size
9233 "arguments" prior to the pointer declaration point and the
9234 size evaluation could end up prior to the side effects. */
9236 if (!TYPE_NAME (type)
9237 && (decl_context == NORMAL || decl_context == FIELD)
9238 && at_function_scope_p ()
9239 && variably_modified_type_p (type, NULL_TREE))
9241 /* First break out any side-effects. */
9242 stabilize_vla_size (TYPE_SIZE (type));
9243 /* And then force evaluation of the SAVE_EXPR. */
9244 finish_expr_stmt (TYPE_SIZE (type));
9247 if (declarator->kind == cdk_reference)
9249 /* In C++0x, the type we are creating a reference to might be
9250 a typedef which is itself a reference type. In that case,
9251 we follow the reference collapsing rules in
9252 [7.1.3/8 dcl.typedef] to create the final reference type:
9254 "If a typedef TD names a type that is a reference to a type
9255 T, an attempt to create the type 'lvalue reference to cv TD'
9256 creates the type 'lvalue reference to T,' while an attempt
9257 to create the type "rvalue reference to cv TD' creates the
9260 if (VOID_TYPE_P (type))
9261 /* We already gave an error. */;
9262 else if (TREE_CODE (type) == REFERENCE_TYPE)
9264 if (declarator->u.reference.rvalue_ref)
9265 /* Leave type alone. */;
9267 type = cp_build_reference_type (TREE_TYPE (type), false);
9270 type = cp_build_reference_type
9271 (type, declarator->u.reference.rvalue_ref);
9273 /* In C++0x, we need this check for direct reference to
9274 reference declarations, which are forbidden by
9275 [8.3.2/5 dcl.ref]. Reference to reference declarations
9276 are only allowed indirectly through typedefs and template
9277 type arguments. Example:
9279 void foo(int & &); // invalid ref-to-ref decl
9281 typedef int & int_ref;
9282 void foo(int_ref &); // valid ref-to-ref decl
9284 if (inner_declarator && inner_declarator->kind == cdk_reference)
9285 error ("cannot declare reference to %q#T, which is not "
9286 "a typedef or a template type argument", type);
9288 else if (TREE_CODE (type) == METHOD_TYPE)
9289 type = build_ptrmemfunc_type (build_pointer_type (type));
9290 else if (declarator->kind == cdk_ptrmem)
9292 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9294 if (declarator->u.pointer.class_type == error_mark_node)
9295 /* We will already have complained. */
9296 type = error_mark_node;
9298 type = build_ptrmem_type (declarator->u.pointer.class_type,
9302 type = build_pointer_type (type);
9304 /* Process a list of type modifier keywords (such as
9305 const or volatile) that were given inside the `*' or `&'. */
9307 if (declarator->u.pointer.qualifiers)
9310 = cp_build_qualified_type (type,
9311 declarator->u.pointer.qualifiers);
9312 type_quals = cp_type_quals (type);
9325 /* We need to stabilize side-effects in VLA sizes for regular array
9326 declarations too, not just pointers to arrays. */
9327 if (type != error_mark_node && !TYPE_NAME (type)
9328 && (decl_context == NORMAL || decl_context == FIELD)
9329 && at_function_scope_p ()
9330 && variably_modified_type_p (type, NULL_TREE))
9331 stabilize_vla_size (TYPE_SIZE (type));
9333 /* A `constexpr' specifier used in an object declaration declares
9334 the object as `const'. */
9335 if (constexpr_p && innermost_code != cdk_function)
9337 if (type_quals & TYPE_QUAL_CONST)
9338 error ("both %<const%> and %<constexpr%> cannot be used here");
9339 if (type_quals & TYPE_QUAL_VOLATILE)
9340 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9341 if (TREE_CODE (type) != REFERENCE_TYPE)
9343 type_quals |= TYPE_QUAL_CONST;
9344 type = cp_build_qualified_type (type, type_quals);
9348 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9349 && TREE_CODE (type) != FUNCTION_TYPE
9350 && TREE_CODE (type) != METHOD_TYPE)
9352 error ("template-id %qD used as a declarator",
9354 unqualified_id = dname;
9357 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9358 qualified with a class-name, turn it into a METHOD_TYPE, unless
9359 we know that the function is static. We take advantage of this
9360 opportunity to do other processing that pertains to entities
9361 explicitly declared to be class members. Note that if DECLARATOR
9362 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9363 would not have exited the loop above. */
9365 && declarator->u.id.qualifying_scope
9366 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9370 ctype = declarator->u.id.qualifying_scope;
9371 ctype = TYPE_MAIN_VARIANT (ctype);
9373 while (t != NULL_TREE && CLASS_TYPE_P (t))
9375 /* You're supposed to have one `template <...>' for every
9376 template class, but you don't need one for a full
9377 specialization. For example:
9379 template <class T> struct S{};
9380 template <> struct S<int> { void f(); };
9381 void S<int>::f () {}
9383 is correct; there shouldn't be a `template <>' for the
9384 definition of `S<int>::f'. */
9385 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9386 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9387 /* T is an explicit (not partial) specialization. All
9388 containing classes must therefore also be explicitly
9391 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9392 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9393 template_count += 1;
9395 t = TYPE_MAIN_DECL (t);
9396 t = DECL_CONTEXT (t);
9399 if (ctype == current_class_type)
9403 permerror (input_location, "member functions are implicitly friends of their class");
9407 permerror (declarator->id_loc,
9408 "extra qualification %<%T::%> on member %qs",
9411 else if (/* If the qualifying type is already complete, then we
9412 can skip the following checks. */
9413 !COMPLETE_TYPE_P (ctype)
9414 && (/* If the function is being defined, then
9415 qualifying type must certainly be complete. */
9417 /* A friend declaration of "T::f" is OK, even if
9418 "T" is a template parameter. But, if this
9419 function is not a friend, the qualifying type
9421 || (!friendp && !CLASS_TYPE_P (ctype))
9422 /* For a declaration, the type need not be
9423 complete, if either it is dependent (since there
9424 is no meaningful definition of complete in that
9425 case) or the qualifying class is currently being
9427 || !(dependent_type_p (ctype)
9428 || currently_open_class (ctype)))
9429 /* Check that the qualifying type is complete. */
9430 && !complete_type_or_else (ctype, NULL_TREE))
9431 return error_mark_node;
9432 else if (TREE_CODE (type) == FUNCTION_TYPE)
9434 if (current_class_type
9435 && (!friendp || funcdef_flag))
9438 ? "cannot define member function %<%T::%s%> within %<%T%>"
9439 : "cannot declare member function %<%T::%s%> within %<%T%>",
9440 ctype, name, current_class_type);
9441 return error_mark_node;
9444 else if (declspecs->specs[(int)ds_typedef]
9445 && current_class_type)
9447 error ("cannot declare member %<%T::%s%> within %qT",
9448 ctype, name, current_class_type);
9449 return error_mark_node;
9453 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9454 ctype = current_class_type;
9456 /* Now TYPE has the actual type. */
9461 *attrlist = chainon (returned_attrs, *attrlist);
9463 attrlist = &returned_attrs;
9466 /* Handle parameter packs. */
9467 if (parameter_pack_p)
9469 if (decl_context == PARM)
9470 /* Turn the type into a pack expansion.*/
9471 type = make_pack_expansion (type);
9473 error ("non-parameter %qs cannot be a parameter pack", name);
9476 /* Did array size calculations overflow? */
9478 if (TREE_CODE (type) == ARRAY_TYPE
9479 && COMPLETE_TYPE_P (type)
9480 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9481 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9483 error ("size of array %qs is too large", name);
9484 /* If we proceed with the array type as it is, we'll eventually
9485 crash in tree_low_cst(). */
9486 type = error_mark_node;
9489 if ((decl_context == FIELD || decl_context == PARM)
9490 && !processing_template_decl
9491 && variably_modified_type_p (type, NULL_TREE))
9493 if (decl_context == FIELD)
9494 error ("data member may not have variably modified type %qT", type);
9496 error ("parameter may not have variably modified type %qT", type);
9497 type = error_mark_node;
9500 if (explicitp == 1 || (explicitp && friendp))
9502 /* [dcl.fct.spec] The explicit specifier shall only be used in
9503 declarations of constructors within a class definition. */
9504 error ("only declarations of constructors can be %<explicit%>");
9508 if (storage_class == sc_mutable)
9510 if (decl_context != FIELD || friendp)
9512 error ("non-member %qs cannot be declared %<mutable%>", name);
9513 storage_class = sc_none;
9515 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9517 error ("non-object member %qs cannot be declared %<mutable%>", name);
9518 storage_class = sc_none;
9520 else if (TREE_CODE (type) == FUNCTION_TYPE
9521 || TREE_CODE (type) == METHOD_TYPE)
9523 error ("function %qs cannot be declared %<mutable%>", name);
9524 storage_class = sc_none;
9528 error ("static %qs cannot be declared %<mutable%>", name);
9529 storage_class = sc_none;
9531 else if (type_quals & TYPE_QUAL_CONST)
9533 error ("const %qs cannot be declared %<mutable%>", name);
9534 storage_class = sc_none;
9536 else if (TREE_CODE (type) == REFERENCE_TYPE)
9538 permerror (input_location, "reference %qs cannot be declared "
9539 "%<mutable%>", name);
9540 storage_class = sc_none;
9544 /* If this is declaring a typedef name, return a TYPE_DECL. */
9545 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9549 /* Note that the grammar rejects storage classes
9550 in typenames, fields or parameters. */
9551 if (current_lang_name == lang_name_java)
9552 TYPE_FOR_JAVA (type) = 1;
9554 /* This declaration:
9556 typedef void f(int) const;
9558 declares a function type which is not a member of any
9559 particular class, but which is cv-qualified; for
9560 example "f S::*" declares a pointer to a const-qualified
9561 member function of S. We record the cv-qualification in the
9563 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9565 type = apply_memfn_quals (type, memfn_quals);
9567 /* We have now dealt with these qualifiers. */
9568 memfn_quals = TYPE_UNQUALIFIED;
9571 if (type_uses_auto (type))
9573 error ("typedef declared %<auto%>");
9574 type = error_mark_node;
9577 if (decl_context == FIELD)
9578 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9580 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9581 if (id_declarator && declarator->u.id.qualifying_scope) {
9582 error_at (DECL_SOURCE_LOCATION (decl),
9583 "typedef name may not be a nested-name-specifier");
9584 TREE_TYPE (decl) = error_mark_node;
9587 if (decl_context != FIELD)
9589 if (!current_function_decl)
9590 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9591 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9592 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9593 (current_function_decl)))
9594 /* The TYPE_DECL is "abstract" because there will be
9595 clones of this constructor/destructor, and there will
9596 be copies of this TYPE_DECL generated in those
9598 DECL_ABSTRACT (decl) = 1;
9600 else if (constructor_name_p (unqualified_id, current_class_type))
9601 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9602 "as enclosing class",
9605 /* If the user declares "typedef struct {...} foo" then the
9606 struct will have an anonymous name. Fill that name in now.
9607 Nothing can refer to it, so nothing needs know about the name
9609 if (type != error_mark_node
9612 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9613 && TYPE_ANONYMOUS_P (type)
9614 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9618 /* Replace the anonymous name with the real name everywhere. */
9619 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9621 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9622 /* We do not rename the debug info representing the
9623 anonymous tagged type because the standard says in
9624 [dcl.typedef] that the naming applies only for
9625 linkage purposes. */
9626 /*debug_hooks->set_name (t, decl);*/
9627 TYPE_NAME (t) = decl;
9630 if (TYPE_LANG_SPECIFIC (type))
9631 TYPE_WAS_ANONYMOUS (type) = 1;
9633 /* If this is a typedef within a template class, the nested
9634 type is a (non-primary) template. The name for the
9635 template needs updating as well. */
9636 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9637 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9638 = TYPE_IDENTIFIER (type);
9640 /* Adjust linkage now that we aren't anonymous anymore. */
9641 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9642 determine_visibility (TYPE_MAIN_DECL (type));
9644 /* FIXME remangle member functions; member functions of a
9645 type with external linkage have external linkage. */
9649 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9650 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9652 bad_specifiers (decl, BSP_TYPE, virtualp,
9653 memfn_quals != TYPE_UNQUALIFIED,
9654 inlinep, friendp, raises != NULL_TREE);
9659 /* Detect the case of an array type of unspecified size
9660 which came, as such, direct from a typedef name.
9661 We must copy the type, so that the array's domain can be
9662 individually set by the object's initializer. */
9664 if (type && typedef_type
9665 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9666 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9667 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9669 /* Detect where we're using a typedef of function type to declare a
9670 function. PARMS will not be set, so we must create it now. */
9672 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9674 tree decls = NULL_TREE;
9677 for (args = TYPE_ARG_TYPES (type);
9678 args && args != void_list_node;
9679 args = TREE_CHAIN (args))
9681 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9683 DECL_CHAIN (decl) = decls;
9687 parms = nreverse (decls);
9689 if (decl_context != TYPENAME)
9691 /* A cv-qualifier-seq shall only be part of the function type
9692 for a non-static member function. [8.3.5/4 dcl.fct] */
9693 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9694 && (current_class_type == NULL_TREE || staticp) )
9697 ? G_("qualified function types cannot be used to "
9698 "declare static member functions")
9699 : G_("qualified function types cannot be used to "
9700 "declare free functions"));
9701 type = TYPE_MAIN_VARIANT (type);
9704 /* The qualifiers on the function type become the qualifiers on
9705 the non-static member function. */
9706 memfn_quals |= type_memfn_quals (type);
9707 type_quals = TYPE_UNQUALIFIED;
9711 /* If this is a type name (such as, in a cast or sizeof),
9712 compute the type and return it now. */
9714 if (decl_context == TYPENAME)
9716 /* Note that the grammar rejects storage classes
9717 in typenames, fields or parameters. */
9718 if (type_quals != TYPE_UNQUALIFIED)
9719 type_quals = TYPE_UNQUALIFIED;
9721 /* Special case: "friend class foo" looks like a TYPENAME context. */
9724 if (type_quals != TYPE_UNQUALIFIED)
9726 error ("type qualifiers specified for friend class declaration");
9727 type_quals = TYPE_UNQUALIFIED;
9731 error ("%<inline%> specified for friend class declaration");
9737 /* Don't allow friend declaration without a class-key. */
9738 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9739 permerror (input_location, "template parameters cannot be friends");
9740 else if (TREE_CODE (type) == TYPENAME_TYPE)
9741 permerror (input_location, "friend declaration requires class-key, "
9742 "i.e. %<friend class %T::%D%>",
9743 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9745 permerror (input_location, "friend declaration requires class-key, "
9746 "i.e. %<friend %#T%>",
9750 /* Only try to do this stuff if we didn't already give up. */
9751 if (type != integer_type_node)
9753 /* A friendly class? */
9754 if (current_class_type)
9755 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9758 error ("trying to make class %qT a friend of global scope",
9761 type = void_type_node;
9764 else if (memfn_quals)
9766 if (ctype == NULL_TREE
9767 && TREE_CODE (type) == METHOD_TYPE)
9768 ctype = TYPE_METHOD_BASETYPE (type);
9771 type = build_memfn_type (type, ctype, memfn_quals);
9772 /* Core issue #547: need to allow this in template type args. */
9773 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9774 type = apply_memfn_quals (type, memfn_quals);
9776 error ("invalid qualifiers on non-member function type");
9781 else if (unqualified_id == NULL_TREE && decl_context != PARM
9782 && decl_context != CATCHPARM
9783 && TREE_CODE (type) != UNION_TYPE
9786 error ("abstract declarator %qT used as declaration", type);
9787 return error_mark_node;
9790 /* Only functions may be declared using an operator-function-id. */
9792 && IDENTIFIER_OPNAME_P (unqualified_id)
9793 && TREE_CODE (type) != FUNCTION_TYPE
9794 && TREE_CODE (type) != METHOD_TYPE)
9796 error ("declaration of %qD as non-function", unqualified_id);
9797 return error_mark_node;
9800 /* We don't check parameter types here because we can emit a better
9801 error message later. */
9802 if (decl_context != PARM)
9804 type = check_var_type (unqualified_id, type);
9805 if (type == error_mark_node)
9806 return error_mark_node;
9809 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9810 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9812 if (decl_context == PARM || decl_context == CATCHPARM)
9814 if (ctype || in_namespace)
9815 error ("cannot use %<::%> in parameter declaration");
9817 if (type_uses_auto (type))
9819 error ("parameter declared %<auto%>");
9820 type = error_mark_node;
9823 /* A parameter declared as an array of T is really a pointer to T.
9824 One declared as a function is really a pointer to a function.
9825 One declared as a member is really a pointer to member. */
9827 if (TREE_CODE (type) == ARRAY_TYPE)
9829 /* Transfer const-ness of array into that of type pointed to. */
9830 type = build_pointer_type (TREE_TYPE (type));
9831 type_quals = TYPE_UNQUALIFIED;
9833 else if (TREE_CODE (type) == FUNCTION_TYPE)
9834 type = build_pointer_type (type);
9837 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9838 && !NEW_DELETE_OPNAME_P (unqualified_id))
9840 cp_cv_quals real_quals = memfn_quals;
9841 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9842 real_quals |= TYPE_QUAL_CONST;
9843 type = build_memfn_type (type, ctype, real_quals);
9849 if (decl_context == PARM)
9851 decl = cp_build_parm_decl (unqualified_id, type);
9853 bad_specifiers (decl, BSP_PARM, virtualp,
9854 memfn_quals != TYPE_UNQUALIFIED,
9855 inlinep, friendp, raises != NULL_TREE);
9857 else if (decl_context == FIELD)
9859 /* The C99 flexible array extension. */
9860 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9861 && TYPE_DOMAIN (type) == NULL_TREE)
9863 tree itype = compute_array_index_type (dname, integer_zero_node,
9864 tf_warning_or_error);
9865 type = build_cplus_array_type (TREE_TYPE (type), itype);
9868 if (type == error_mark_node)
9870 /* Happens when declaring arrays of sizes which
9871 are error_mark_node, for example. */
9874 else if (in_namespace && !friendp)
9876 /* Something like struct S { int N::j; }; */
9877 error ("invalid use of %<::%>");
9878 return error_mark_node;
9880 else if (TREE_CODE (type) == FUNCTION_TYPE
9881 || TREE_CODE (type) == METHOD_TYPE)
9884 tree function_context;
9888 /* This should never happen in pure C++ (the check
9889 could be an assert). It could happen in
9890 Objective-C++ if someone writes invalid code that
9891 uses a function declaration for an instance
9892 variable or property (instance variables and
9893 properties are parsed as FIELD_DECLs, but they are
9894 part of an Objective-C class, not a C++ class).
9895 That code is invalid and is caught by this
9899 error ("declaration of function %qD in invalid context",
9901 return error_mark_node;
9904 /* ``A union may [ ... ] not [ have ] virtual functions.''
9906 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9908 error ("function %qD declared virtual inside a union",
9910 return error_mark_node;
9913 if (NEW_DELETE_OPNAME_P (unqualified_id))
9917 error ("%qD cannot be declared virtual, since it "
9925 /* Check that the name used for a destructor makes sense. */
9926 if (sfk == sfk_destructor)
9928 tree uqname = id_declarator->u.id.unqualified_name;
9932 gcc_assert (friendp);
9933 error ("expected qualified name in friend declaration "
9934 "for destructor %qD", uqname);
9935 return error_mark_node;
9938 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9940 error ("declaration of %qD as member of %qT",
9942 return error_mark_node;
9946 error ("a destructor cannot be %<constexpr%>");
9947 return error_mark_node;
9950 else if (sfk == sfk_constructor && friendp && !ctype)
9952 error ("expected qualified name in friend declaration "
9953 "for constructor %qD",
9954 id_declarator->u.id.unqualified_name);
9955 return error_mark_node;
9958 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9959 function_context = (ctype != NULL_TREE) ?
9960 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9961 publicp = (! friendp || ! staticp)
9962 && function_context == NULL_TREE;
9963 decl = grokfndecl (ctype, type,
9964 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9965 ? unqualified_id : dname,
9968 virtualp, flags, memfn_quals, raises,
9969 friendp ? -1 : 0, friendp, publicp,
9970 inlinep | (2 * constexpr_p),
9972 funcdef_flag, template_count, in_namespace,
9973 attrlist, declarator->id_loc);
9974 decl = set_virt_specifiers (decl, virt_specifiers);
9975 if (decl == NULL_TREE)
9976 return error_mark_node;
9978 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9979 /* The decl and setting of decl_attr is also turned off. */
9980 decl = build_decl_attribute_variant (decl, decl_attr);
9983 /* [class.conv.ctor]
9985 A constructor declared without the function-specifier
9986 explicit that can be called with a single parameter
9987 specifies a conversion from the type of its first
9988 parameter to the type of its class. Such a constructor
9989 is called a converting constructor. */
9991 DECL_NONCONVERTING_P (decl) = 1;
9993 else if (!staticp && !dependent_type_p (type)
9994 && !COMPLETE_TYPE_P (complete_type (type))
9995 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9998 error ("field %qD has incomplete type", unqualified_id);
10000 error ("name %qT has incomplete type", type);
10002 /* If we're instantiating a template, tell them which
10003 instantiation made the field's type be incomplete. */
10004 if (current_class_type
10005 && TYPE_NAME (current_class_type)
10006 && IDENTIFIER_TEMPLATE (current_class_name)
10008 && declspecs->type == type)
10009 error (" in instantiation of template %qT",
10010 current_class_type);
10012 return error_mark_node;
10018 error ("%qE is neither function nor member function; "
10019 "cannot be declared friend", unqualified_id);
10027 /* Friends are treated specially. */
10028 if (ctype == current_class_type)
10029 ; /* We already issued a permerror. */
10030 else if (decl && DECL_NAME (decl))
10032 if (template_class_depth (current_class_type) == 0)
10034 decl = check_explicit_specialization
10035 (unqualified_id, decl, template_count,
10036 2 * funcdef_flag + 4);
10037 if (decl == error_mark_node)
10038 return error_mark_node;
10041 decl = do_friend (ctype, unqualified_id, decl,
10047 return error_mark_node;
10050 /* Structure field. It may not be a function, except for C++. */
10052 if (decl == NULL_TREE)
10058 /* An attempt is being made to initialize a non-static
10059 member. But, from [class.mem]:
10061 4 A member-declarator can contain a
10062 constant-initializer only if it declares a static
10063 member (_class.static_) of integral or enumeration
10064 type, see _class.static.data_.
10066 This used to be relatively common practice, but
10067 the rest of the compiler does not correctly
10068 handle the initialization unless the member is
10069 static so we make it static below. */
10070 if (cxx_dialect >= cxx0x)
10072 sorry ("non-static data member initializers");
10076 permerror (input_location, "ISO C++ forbids initialization of member %qD",
10078 permerror (input_location, "making %qD static", unqualified_id);
10086 /* C++ allows static class members. All other work
10087 for this is done by grokfield. */
10088 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10089 set_linkage_for_static_data_member (decl);
10090 /* Even if there is an in-class initialization, DECL
10091 is considered undefined until an out-of-class
10092 definition is provided. */
10093 DECL_EXTERNAL (decl) = 1;
10096 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10098 if (constexpr_p && !initialized)
10100 error ("constexpr static data member %qD must have an "
10101 "initializer", decl);
10102 constexpr_p = false;
10109 error ("non-static data member %qE declared %<constexpr%>",
10111 constexpr_p = false;
10113 decl = build_decl (input_location,
10114 FIELD_DECL, unqualified_id, type);
10115 DECL_NONADDRESSABLE_P (decl) = bitfield;
10116 if (bitfield && !unqualified_id)
10117 TREE_NO_WARNING (decl) = 1;
10119 if (storage_class == sc_mutable)
10121 DECL_MUTABLE_P (decl) = 1;
10122 storage_class = sc_none;
10126 bad_specifiers (decl, BSP_FIELD, virtualp,
10127 memfn_quals != TYPE_UNQUALIFIED,
10128 inlinep, friendp, raises != NULL_TREE);
10131 else if (TREE_CODE (type) == FUNCTION_TYPE
10132 || TREE_CODE (type) == METHOD_TYPE)
10134 tree original_name;
10137 if (!unqualified_id)
10138 return error_mark_node;
10140 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10141 original_name = dname;
10143 original_name = unqualified_id;
10145 if (storage_class == sc_auto)
10146 error ("storage class %<auto%> invalid for function %qs", name);
10147 else if (storage_class == sc_register)
10148 error ("storage class %<register%> invalid for function %qs", name);
10150 error ("storage class %<__thread%> invalid for function %qs", name);
10152 if (virt_specifiers)
10153 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10154 /* Function declaration not at top level.
10155 Storage classes other than `extern' are not allowed
10156 and `extern' makes no difference. */
10157 if (! toplevel_bindings_p ()
10158 && (storage_class == sc_static
10159 || declspecs->specs[(int)ds_inline])
10162 if (storage_class == sc_static)
10163 pedwarn (input_location, OPT_pedantic,
10164 "%<static%> specified invalid for function %qs "
10165 "declared out of global scope", name);
10167 pedwarn (input_location, OPT_pedantic,
10168 "%<inline%> specifier invalid for function %qs "
10169 "declared out of global scope", name);
10172 if (ctype == NULL_TREE)
10176 error ("virtual non-class function %qs", name);
10179 else if (sfk == sfk_constructor
10180 || sfk == sfk_destructor)
10182 error (funcdef_flag
10183 ? "%qs defined in a non-class scope"
10184 : "%qs declared in a non-class scope", name);
10189 /* Record presence of `static'. */
10190 publicp = (ctype != NULL_TREE
10191 || storage_class == sc_extern
10192 || storage_class != sc_static);
10194 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10195 virtualp, flags, memfn_quals, raises,
10197 publicp, inlinep | (2 * constexpr_p), sfk,
10199 template_count, in_namespace, attrlist,
10200 declarator->id_loc);
10201 if (decl == NULL_TREE)
10202 return error_mark_node;
10206 int invalid_static = 0;
10208 /* Don't allow a static member function in a class, and forbid
10209 declaring main to be static. */
10210 if (TREE_CODE (type) == METHOD_TYPE)
10212 permerror (input_location, "cannot declare member function %qD to have "
10213 "static linkage", decl);
10214 invalid_static = 1;
10216 else if (current_function_decl)
10218 /* FIXME need arm citation */
10219 error ("cannot declare static function inside another function");
10220 invalid_static = 1;
10223 if (invalid_static)
10226 storage_class = sc_none;
10232 /* It's a variable. */
10234 /* An uninitialized decl with `extern' is a reference. */
10235 decl = grokvardecl (type, unqualified_id,
10238 (type_quals & TYPE_QUAL_CONST) != 0,
10239 ctype ? ctype : in_namespace);
10240 bad_specifiers (decl, BSP_VAR, virtualp,
10241 memfn_quals != TYPE_UNQUALIFIED,
10242 inlinep, friendp, raises != NULL_TREE);
10246 DECL_CONTEXT (decl) = ctype;
10249 permerror (input_location, "%<static%> may not be used when defining "
10250 "(as opposed to declaring) a static data member");
10252 storage_class = sc_none;
10254 if (storage_class == sc_register && TREE_STATIC (decl))
10256 error ("static member %qD declared %<register%>", decl);
10257 storage_class = sc_none;
10259 if (storage_class == sc_extern && pedantic)
10261 pedwarn (input_location, OPT_pedantic,
10262 "cannot explicitly declare member %q#D to have "
10263 "extern linkage", decl);
10264 storage_class = sc_none;
10267 else if (constexpr_p && DECL_EXTERNAL (decl))
10269 error ("declaration of constexpr variable %qD is not a definition",
10271 constexpr_p = false;
10275 if (storage_class == sc_extern && initialized && !funcdef_flag)
10277 if (toplevel_bindings_p ())
10279 /* It's common practice (and completely valid) to have a const
10280 be initialized and declared extern. */
10281 if (!(type_quals & TYPE_QUAL_CONST))
10282 warning (0, "%qs initialized and declared %<extern%>", name);
10286 error ("%qs has both %<extern%> and initializer", name);
10287 return error_mark_node;
10291 /* Record `register' declaration for warnings on &
10292 and in case doing stupid register allocation. */
10294 if (storage_class == sc_register)
10295 DECL_REGISTER (decl) = 1;
10296 else if (storage_class == sc_extern)
10297 DECL_THIS_EXTERN (decl) = 1;
10298 else if (storage_class == sc_static)
10299 DECL_THIS_STATIC (decl) = 1;
10301 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10302 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10303 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10305 /* Record constancy and volatility on the DECL itself . There's
10306 no need to do this when processing a template; we'll do this
10307 for the instantiated declaration based on the type of DECL. */
10308 if (!processing_template_decl)
10309 cp_apply_type_quals_to_decl (type_quals, decl);
10315 /* Subroutine of start_function. Ensure that each of the parameter
10316 types (as listed in PARMS) is complete, as is required for a
10317 function definition. */
10320 require_complete_types_for_parms (tree parms)
10322 for (; parms; parms = DECL_CHAIN (parms))
10324 if (dependent_type_p (TREE_TYPE (parms)))
10326 if (!VOID_TYPE_P (TREE_TYPE (parms))
10327 && complete_type_or_else (TREE_TYPE (parms), parms))
10329 relayout_decl (parms);
10330 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10333 /* grokparms or complete_type_or_else will have already issued
10335 TREE_TYPE (parms) = error_mark_node;
10339 /* Returns nonzero if T is a local variable. */
10342 local_variable_p (const_tree t)
10344 if ((TREE_CODE (t) == VAR_DECL
10345 /* A VAR_DECL with a context that is a _TYPE is a static data
10347 && !TYPE_P (CP_DECL_CONTEXT (t))
10348 /* Any other non-local variable must be at namespace scope. */
10349 && !DECL_NAMESPACE_SCOPE_P (t))
10350 || (TREE_CODE (t) == PARM_DECL))
10356 /* Like local_variable_p, but suitable for use as a tree-walking
10360 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10361 void *data ATTRIBUTE_UNUSED)
10363 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10365 else if (TYPE_P (*tp))
10366 *walk_subtrees = 0;
10372 /* Check that ARG, which is a default-argument expression for a
10373 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10374 something goes wrong. DECL may also be a _TYPE node, rather than a
10375 DECL, if there is no DECL available. */
10378 check_default_argument (tree decl, tree arg)
10383 if (TREE_CODE (arg) == DEFAULT_ARG)
10384 /* We get a DEFAULT_ARG when looking at an in-class declaration
10385 with a default argument. Ignore the argument for now; we'll
10386 deal with it after the class is complete. */
10395 decl_type = TREE_TYPE (decl);
10397 if (arg == error_mark_node
10398 || decl == error_mark_node
10399 || TREE_TYPE (arg) == error_mark_node
10400 || decl_type == error_mark_node)
10401 /* Something already went wrong. There's no need to check
10403 return error_mark_node;
10405 /* [dcl.fct.default]
10407 A default argument expression is implicitly converted to the
10409 if (!TREE_TYPE (arg)
10410 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10413 error ("default argument for %q#D has type %qT",
10414 decl, TREE_TYPE (arg));
10416 error ("default argument for parameter of type %qT has type %qT",
10417 decl_type, TREE_TYPE (arg));
10419 return error_mark_node;
10422 /* [dcl.fct.default]
10424 Local variables shall not be used in default argument
10427 The keyword `this' shall not be used in a default argument of a
10428 member function. */
10429 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10432 error ("default argument %qE uses local variable %qD", arg, var);
10433 return error_mark_node;
10440 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10443 type_is_deprecated (tree type)
10445 enum tree_code code;
10446 if (TREE_DEPRECATED (type))
10448 if (TYPE_NAME (type)
10449 && TREE_DEPRECATED (TYPE_NAME (type)))
10452 /* Do warn about using typedefs to a deprecated class. */
10453 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10454 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10456 code = TREE_CODE (type);
10458 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10459 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10460 || code == METHOD_TYPE || code == ARRAY_TYPE)
10461 return type_is_deprecated (TREE_TYPE (type));
10463 if (TYPE_PTRMEMFUNC_P (type))
10464 return type_is_deprecated
10465 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10470 /* Decode the list of parameter types for a function type.
10471 Given the list of things declared inside the parens,
10472 return a list of types.
10474 If this parameter does not end with an ellipsis, we append
10477 *PARMS is set to the chain of PARM_DECLs created. */
10480 grokparms (tree parmlist, tree *parms)
10482 tree result = NULL_TREE;
10483 tree decls = NULL_TREE;
10487 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10489 tree type = NULL_TREE;
10490 tree init = TREE_PURPOSE (parm);
10491 tree decl = TREE_VALUE (parm);
10492 const char *errmsg;
10494 if (parm == void_list_node)
10497 if (! decl || TREE_TYPE (decl) == error_mark_node)
10500 type = TREE_TYPE (decl);
10501 if (VOID_TYPE_P (type))
10503 if (same_type_p (type, void_type_node)
10504 && DECL_SELF_REFERENCE_P (type)
10505 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10506 /* this is a parmlist of `(void)', which is ok. */
10508 cxx_incomplete_type_error (decl, type);
10509 /* It's not a good idea to actually create parameters of
10510 type `void'; other parts of the compiler assume that a
10511 void type terminates the parameter list. */
10512 type = error_mark_node;
10513 TREE_TYPE (decl) = error_mark_node;
10516 if (type != error_mark_node
10517 && TYPE_FOR_JAVA (type)
10518 && MAYBE_CLASS_TYPE_P (type))
10520 error ("parameter %qD has Java class type", decl);
10521 type = error_mark_node;
10522 TREE_TYPE (decl) = error_mark_node;
10526 if (type != error_mark_node
10527 && (errmsg = targetm.invalid_parameter_type (type)))
10530 type = error_mark_node;
10531 TREE_TYPE (decl) = error_mark_node;
10534 if (type != error_mark_node)
10536 if (deprecated_state != DEPRECATED_SUPPRESS)
10538 tree deptype = type_is_deprecated (type);
10540 warn_deprecated_use (deptype, NULL_TREE);
10543 /* Top-level qualifiers on the parameters are
10544 ignored for function types. */
10545 type = cp_build_qualified_type (type, 0);
10546 if (TREE_CODE (type) == METHOD_TYPE)
10548 error ("parameter %qD invalidly declared method type", decl);
10549 type = build_pointer_type (type);
10550 TREE_TYPE (decl) = type;
10552 else if (abstract_virtuals_error (decl, type))
10553 any_error = 1; /* Seems like a good idea. */
10554 else if (POINTER_TYPE_P (type))
10556 /* [dcl.fct]/6, parameter types cannot contain pointers
10557 (references) to arrays of unknown bound. */
10558 tree t = TREE_TYPE (type);
10559 int ptr = TYPE_PTR_P (type);
10563 if (TYPE_PTR_P (t))
10565 else if (TREE_CODE (t) != ARRAY_TYPE)
10567 else if (!TYPE_DOMAIN (t))
10571 if (TREE_CODE (t) == ARRAY_TYPE)
10573 ? G_("parameter %qD includes pointer to array of "
10574 "unknown bound %qT")
10575 : G_("parameter %qD includes reference to array of "
10576 "unknown bound %qT"),
10582 else if (init && !processing_template_decl)
10583 init = check_default_argument (decl, init);
10586 DECL_CHAIN (decl) = decls;
10588 result = tree_cons (init, type, result);
10590 decls = nreverse (decls);
10591 result = nreverse (result);
10593 result = chainon (result, void_list_node);
10600 /* D is a constructor or overloaded `operator='.
10602 Let T be the class in which D is declared. Then, this function
10605 -1 if D's is an ill-formed constructor or copy assignment operator
10606 whose first parameter is of type `T'.
10607 0 if D is not a copy constructor or copy assignment
10609 1 if D is a copy constructor or copy assignment operator whose
10610 first parameter is a reference to non-const qualified T.
10611 2 if D is a copy constructor or copy assignment operator whose
10612 first parameter is a reference to const qualified T.
10614 This function can be used as a predicate. Positive values indicate
10615 a copy constructor and nonzero values indicate a copy assignment
10619 copy_fn_p (const_tree d)
10625 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10627 if (TREE_CODE (d) == TEMPLATE_DECL
10628 || (DECL_TEMPLATE_INFO (d)
10629 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10630 /* Instantiations of template member functions are never copy
10631 functions. Note that member functions of templated classes are
10632 represented as template functions internally, and we must
10633 accept those as copy functions. */
10636 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10640 arg_type = TREE_VALUE (args);
10641 if (arg_type == error_mark_node)
10644 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10646 /* Pass by value copy assignment operator. */
10649 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10650 && !TYPE_REF_IS_RVALUE (arg_type)
10651 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10653 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10659 args = TREE_CHAIN (args);
10661 if (args && args != void_list_node && !TREE_PURPOSE (args))
10662 /* There are more non-optional args. */
10668 /* D is a constructor or overloaded `operator='.
10670 Let T be the class in which D is declared. Then, this function
10671 returns true when D is a move constructor or move assignment
10672 operator, false otherwise. */
10675 move_fn_p (const_tree d)
10679 bool result = false;
10681 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10683 if (cxx_dialect == cxx98)
10684 /* There are no move constructors if we are in C++98 mode. */
10687 if (TREE_CODE (d) == TEMPLATE_DECL
10688 || (DECL_TEMPLATE_INFO (d)
10689 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10690 /* Instantiations of template member functions are never copy
10691 functions. Note that member functions of templated classes are
10692 represented as template functions internally, and we must
10693 accept those as copy functions. */
10696 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10700 arg_type = TREE_VALUE (args);
10701 if (arg_type == error_mark_node)
10704 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10705 && TYPE_REF_IS_RVALUE (arg_type)
10706 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10710 args = TREE_CHAIN (args);
10712 if (args && args != void_list_node && !TREE_PURPOSE (args))
10713 /* There are more non-optional args. */
10719 /* Remember any special properties of member function DECL. */
10722 grok_special_member_properties (tree decl)
10726 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10729 class_type = DECL_CONTEXT (decl);
10730 if (DECL_CONSTRUCTOR_P (decl))
10732 int ctor = copy_fn_p (decl);
10734 if (!DECL_ARTIFICIAL (decl))
10735 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10741 A non-template constructor for class X is a copy
10742 constructor if its first parameter is of type X&, const
10743 X&, volatile X& or const volatile X&, and either there
10744 are no other parameters or else all other parameters have
10745 default arguments. */
10746 TYPE_HAS_COPY_CTOR (class_type) = 1;
10747 if (user_provided_p (decl))
10748 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10750 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10752 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10754 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10755 if (user_provided_p (decl))
10756 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10758 else if (move_fn_p (decl) && user_provided_p (decl))
10759 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10760 else if (is_list_ctor (decl))
10761 TYPE_HAS_LIST_CTOR (class_type) = 1;
10763 if (DECL_DECLARED_CONSTEXPR_P (decl)
10764 && !copy_fn_p (decl) && !move_fn_p (decl))
10765 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10767 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10771 A non-template assignment operator for class X is a copy
10772 assignment operator if its parameter is of type X, X&, const
10773 X&, volatile X& or const volatile X&. */
10775 int assop = copy_fn_p (decl);
10779 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10780 if (user_provided_p (decl))
10781 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10783 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10785 else if (move_fn_p (decl) && user_provided_p (decl))
10786 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10788 /* Destructors are handled in check_methods. */
10791 /* Check a constructor DECL has the correct form. Complains
10792 if the class has a constructor of the form X(X). */
10795 grok_ctor_properties (const_tree ctype, const_tree decl)
10797 int ctor_parm = copy_fn_p (decl);
10803 A declaration of a constructor for a class X is ill-formed if
10804 its first parameter is of type (optionally cv-qualified) X
10805 and either there are no other parameters or else all other
10806 parameters have default arguments.
10808 We *don't* complain about member template instantiations that
10809 have this form, though; they can occur as we try to decide
10810 what constructor to use during overload resolution. Since
10811 overload resolution will never prefer such a constructor to
10812 the non-template copy constructor (which is either explicitly
10813 or implicitly defined), there's no need to worry about their
10814 existence. Theoretically, they should never even be
10815 instantiated, but that's hard to forestall. */
10816 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10824 /* An operator with this code is unary, but can also be binary. */
10827 ambi_op_p (enum tree_code code)
10829 return (code == INDIRECT_REF
10830 || code == ADDR_EXPR
10831 || code == UNARY_PLUS_EXPR
10832 || code == NEGATE_EXPR
10833 || code == PREINCREMENT_EXPR
10834 || code == PREDECREMENT_EXPR);
10837 /* An operator with this name can only be unary. */
10840 unary_op_p (enum tree_code code)
10842 return (code == TRUTH_NOT_EXPR
10843 || code == BIT_NOT_EXPR
10844 || code == COMPONENT_REF
10845 || code == TYPE_EXPR);
10848 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10849 errors are issued for invalid declarations. */
10852 grok_op_properties (tree decl, bool complain)
10854 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10856 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10857 tree name = DECL_NAME (decl);
10858 enum tree_code operator_code;
10863 /* Count the number of arguments and check for ellipsis. */
10864 for (argtype = argtypes, arity = 0;
10865 argtype && argtype != void_list_node;
10866 argtype = TREE_CHAIN (argtype))
10868 ellipsis_p = !argtype;
10870 class_type = DECL_CONTEXT (decl);
10871 if (class_type && !CLASS_TYPE_P (class_type))
10872 class_type = NULL_TREE;
10874 if (DECL_CONV_FN_P (decl))
10875 operator_code = TYPE_EXPR;
10879 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10880 if (ansi_opname (CODE) == name) \
10882 operator_code = (CODE); \
10885 else if (ansi_assopname (CODE) == name) \
10887 operator_code = (CODE); \
10888 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10892 #include "operators.def"
10893 #undef DEF_OPERATOR
10895 gcc_unreachable ();
10898 gcc_assert (operator_code != MAX_TREE_CODES);
10899 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10902 switch (operator_code)
10905 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10909 TYPE_GETS_DELETE (class_type) |= 1;
10913 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10916 case VEC_DELETE_EXPR:
10917 TYPE_GETS_DELETE (class_type) |= 2;
10924 /* [basic.std.dynamic.allocation]/1:
10926 A program is ill-formed if an allocation function is declared
10927 in a namespace scope other than global scope or declared static
10930 The same also holds true for deallocation functions. */
10931 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10932 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10934 if (DECL_NAMESPACE_SCOPE_P (decl))
10936 if (CP_DECL_CONTEXT (decl) != global_namespace)
10938 error ("%qD may not be declared within a namespace", decl);
10941 else if (!TREE_PUBLIC (decl))
10943 error ("%qD may not be declared as static", decl);
10949 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10951 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10952 DECL_IS_OPERATOR_NEW (decl) = 1;
10954 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10955 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10958 /* An operator function must either be a non-static member function
10959 or have at least one parameter of a class, a reference to a class,
10960 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10961 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10963 if (operator_code == TYPE_EXPR
10964 || operator_code == CALL_EXPR
10965 || operator_code == COMPONENT_REF
10966 || operator_code == ARRAY_REF
10967 || operator_code == NOP_EXPR)
10969 error ("%qD must be a nonstatic member function", decl);
10976 if (DECL_STATIC_FUNCTION_P (decl))
10978 error ("%qD must be either a non-static member "
10979 "function or a non-member function", decl);
10983 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10985 tree arg = non_reference (TREE_VALUE (p));
10986 if (arg == error_mark_node)
10989 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10990 because these checks are performed even on
10991 template functions. */
10992 if (MAYBE_CLASS_TYPE_P (arg)
10993 || TREE_CODE (arg) == ENUMERAL_TYPE)
10997 if (!p || p == void_list_node)
11000 error ("%qD must have an argument of class or "
11001 "enumerated type", decl);
11007 /* There are no restrictions on the arguments to an overloaded
11009 if (operator_code == CALL_EXPR)
11012 /* Warn about conversion operators that will never be used. */
11013 if (IDENTIFIER_TYPENAME_P (name)
11014 && ! DECL_TEMPLATE_INFO (decl)
11016 /* Warn only declaring the function; there is no need to
11017 warn again about out-of-class definitions. */
11018 && class_type == current_class_type)
11020 tree t = TREE_TYPE (name);
11021 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11024 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11026 if (TREE_CODE (t) == VOID_TYPE)
11027 warning (OPT_Wconversion,
11029 ? G_("conversion to a reference to void "
11030 "will never use a type conversion operator")
11031 : G_("conversion to void "
11032 "will never use a type conversion operator"));
11033 else if (class_type)
11035 if (t == class_type)
11036 warning (OPT_Wconversion,
11038 ? G_("conversion to a reference to the same type "
11039 "will never use a type conversion operator")
11040 : G_("conversion to the same type "
11041 "will never use a type conversion operator"));
11042 /* Don't force t to be complete here. */
11043 else if (MAYBE_CLASS_TYPE_P (t)
11044 && COMPLETE_TYPE_P (t)
11045 && DERIVED_FROM_P (t, class_type))
11046 warning (OPT_Wconversion,
11048 ? G_("conversion to a reference to a base class "
11049 "will never use a type conversion operator")
11050 : G_("conversion to a base class "
11051 "will never use a type conversion operator"));
11056 if (operator_code == COND_EXPR)
11059 error ("ISO C++ prohibits overloading operator ?:");
11062 else if (ellipsis_p)
11064 error ("%qD must not have variable number of arguments", decl);
11067 else if (ambi_op_p (operator_code))
11070 /* We pick the one-argument operator codes by default, so
11071 we don't have to change anything. */
11073 else if (arity == 2)
11075 /* If we thought this was a unary operator, we now know
11076 it to be a binary operator. */
11077 switch (operator_code)
11080 operator_code = MULT_EXPR;
11084 operator_code = BIT_AND_EXPR;
11087 case UNARY_PLUS_EXPR:
11088 operator_code = PLUS_EXPR;
11092 operator_code = MINUS_EXPR;
11095 case PREINCREMENT_EXPR:
11096 operator_code = POSTINCREMENT_EXPR;
11099 case PREDECREMENT_EXPR:
11100 operator_code = POSTDECREMENT_EXPR;
11104 gcc_unreachable ();
11107 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11109 if ((operator_code == POSTINCREMENT_EXPR
11110 || operator_code == POSTDECREMENT_EXPR)
11111 && ! processing_template_decl
11112 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11115 error ("postfix %qD must take %<int%> as its argument",
11118 error ("postfix %qD must take %<int%> as its second "
11126 error ("%qD must take either zero or one argument", decl);
11128 error ("%qD must take either one or two arguments", decl);
11132 /* More Effective C++ rule 6. */
11134 && (operator_code == POSTINCREMENT_EXPR
11135 || operator_code == POSTDECREMENT_EXPR
11136 || operator_code == PREINCREMENT_EXPR
11137 || operator_code == PREDECREMENT_EXPR))
11139 tree arg = TREE_VALUE (argtypes);
11140 tree ret = TREE_TYPE (TREE_TYPE (decl));
11141 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11142 arg = TREE_TYPE (arg);
11143 arg = TYPE_MAIN_VARIANT (arg);
11144 if (operator_code == PREINCREMENT_EXPR
11145 || operator_code == PREDECREMENT_EXPR)
11147 if (TREE_CODE (ret) != REFERENCE_TYPE
11148 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11150 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11151 build_reference_type (arg));
11155 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11156 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11160 else if (unary_op_p (operator_code))
11165 error ("%qD must take %<void%>", decl);
11167 error ("%qD must take exactly one argument", decl);
11171 else /* if (binary_op_p (operator_code)) */
11176 error ("%qD must take exactly one argument", decl);
11178 error ("%qD must take exactly two arguments", decl);
11182 /* More Effective C++ rule 7. */
11184 && (operator_code == TRUTH_ANDIF_EXPR
11185 || operator_code == TRUTH_ORIF_EXPR
11186 || operator_code == COMPOUND_EXPR))
11187 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11191 /* Effective C++ rule 23. */
11194 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11195 && (operator_code == PLUS_EXPR
11196 || operator_code == MINUS_EXPR
11197 || operator_code == TRUNC_DIV_EXPR
11198 || operator_code == MULT_EXPR
11199 || operator_code == TRUNC_MOD_EXPR)
11200 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11201 warning (OPT_Weffc__, "%qD should return by value", decl);
11203 /* [over.oper]/8 */
11204 for (; argtypes && argtypes != void_list_node;
11205 argtypes = TREE_CHAIN (argtypes))
11206 if (TREE_PURPOSE (argtypes))
11208 TREE_PURPOSE (argtypes) = NULL_TREE;
11209 if (operator_code == POSTINCREMENT_EXPR
11210 || operator_code == POSTDECREMENT_EXPR)
11212 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11217 error ("%qD cannot have default arguments", decl);
11225 /* Return a string giving the keyword associate with CODE. */
11227 static const char *
11228 tag_name (enum tag_types code)
11240 case typename_type:
11243 gcc_unreachable ();
11247 /* Name lookup in an elaborated-type-specifier (after the keyword
11248 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11249 elaborated-type-specifier is invalid, issue a diagnostic and return
11250 error_mark_node; otherwise, return the *_TYPE to which it referred.
11251 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11254 check_elaborated_type_specifier (enum tag_types tag_code,
11256 bool allow_template_p)
11262 struct S { struct S *p; };
11264 name lookup will find the TYPE_DECL for the implicit "S::S"
11265 typedef. Adjust for that here. */
11266 if (DECL_SELF_REFERENCE_P (decl))
11267 decl = TYPE_NAME (TREE_TYPE (decl));
11269 type = TREE_TYPE (decl);
11271 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11272 is false for this case as well. */
11273 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11275 error ("using template type parameter %qT after %qs",
11276 type, tag_name (tag_code));
11277 return error_mark_node;
11281 If the identifier resolves to a typedef-name or a template
11282 type-parameter, the elaborated-type-specifier is ill-formed.
11284 In other words, the only legitimate declaration to use in the
11285 elaborated type specifier is the implicit typedef created when
11286 the type is declared. */
11287 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11288 && !DECL_SELF_REFERENCE_P (decl)
11289 && tag_code != typename_type)
11291 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11292 error ("%q+D has a previous declaration here", decl);
11293 return error_mark_node;
11295 else if (TREE_CODE (type) != RECORD_TYPE
11296 && TREE_CODE (type) != UNION_TYPE
11297 && tag_code != enum_type
11298 && tag_code != typename_type)
11300 error ("%qT referred to as %qs", type, tag_name (tag_code));
11301 error ("%q+T has a previous declaration here", type);
11302 return error_mark_node;
11304 else if (TREE_CODE (type) != ENUMERAL_TYPE
11305 && tag_code == enum_type)
11307 error ("%qT referred to as enum", type);
11308 error ("%q+T has a previous declaration here", type);
11309 return error_mark_node;
11311 else if (!allow_template_p
11312 && TREE_CODE (type) == RECORD_TYPE
11313 && CLASSTYPE_IS_TEMPLATE (type))
11315 /* If a class template appears as elaborated type specifier
11316 without a template header such as:
11318 template <class T> class C {};
11319 void f(class C); // No template header here
11321 then the required template argument is missing. */
11322 error ("template argument required for %<%s %T%>",
11323 tag_name (tag_code),
11324 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11325 return error_mark_node;
11331 /* Lookup NAME in elaborate type specifier in scope according to
11332 SCOPE and issue diagnostics if necessary.
11333 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11334 found, and ERROR_MARK_NODE for type error. */
11337 lookup_and_check_tag (enum tag_types tag_code, tree name,
11338 tag_scope scope, bool template_header_p)
11342 if (scope == ts_global)
11344 /* First try ordinary name lookup, ignoring hidden class name
11345 injected via friend declaration. */
11346 decl = lookup_name_prefer_type (name, 2);
11347 /* If that fails, the name will be placed in the smallest
11348 non-class, non-function-prototype scope according to 3.3.1/5.
11349 We may already have a hidden name declared as friend in this
11350 scope. So lookup again but not ignoring hidden names.
11351 If we find one, that name will be made visible rather than
11352 creating a new tag. */
11354 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11357 decl = lookup_type_scope (name, scope);
11359 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11360 decl = DECL_TEMPLATE_RESULT (decl);
11362 if (decl && TREE_CODE (decl) == TYPE_DECL)
11364 /* Look for invalid nested type:
11368 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11370 error ("%qD has the same name as the class in which it is "
11373 return error_mark_node;
11376 /* Two cases we need to consider when deciding if a class
11377 template is allowed as an elaborated type specifier:
11378 1. It is a self reference to its own class.
11379 2. It comes with a template header.
11383 template <class T> class C {
11384 class C *c1; // DECL_SELF_REFERENCE_P is true
11387 template <class U> class C; // template_header_p is true
11388 template <class T> class C<T>::D {
11389 class C *c2; // DECL_SELF_REFERENCE_P is true
11392 t = check_elaborated_type_specifier (tag_code,
11395 | DECL_SELF_REFERENCE_P (decl));
11398 else if (decl && TREE_CODE (decl) == TREE_LIST)
11400 error ("reference to %qD is ambiguous", name);
11401 print_candidates (decl);
11402 return error_mark_node;
11408 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11409 Define the tag as a forward-reference if it is not defined.
11411 If a declaration is given, process it here, and report an error if
11412 multiple declarations are not identical.
11414 SCOPE is TS_CURRENT when this is also a definition. Only look in
11415 the current frame for the name (since C++ allows new names in any
11416 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11417 declaration. Only look beginning from the current scope outward up
11418 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11420 TEMPLATE_HEADER_P is true when this declaration is preceded by
11421 a set of template parameters. */
11424 xref_tag_1 (enum tag_types tag_code, tree name,
11425 tag_scope scope, bool template_header_p)
11427 enum tree_code code;
11429 tree context = NULL_TREE;
11431 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11437 code = RECORD_TYPE;
11443 code = ENUMERAL_TYPE;
11446 gcc_unreachable ();
11449 /* In case of anonymous name, xref_tag is only called to
11450 make type node and push name. Name lookup is not required. */
11451 if (ANON_AGGRNAME_P (name))
11454 t = lookup_and_check_tag (tag_code, name,
11455 scope, template_header_p);
11457 if (t == error_mark_node)
11458 return error_mark_node;
11460 if (scope != ts_current && t && current_class_type
11461 && template_class_depth (current_class_type)
11462 && template_header_p)
11464 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11465 definition of this tag. Since, in addition, we are currently
11466 processing a (member) template declaration of a template
11467 class, we must be very careful; consider:
11474 { template <class V>
11475 friend struct S1; };
11477 Here, the S2::S1 declaration should not be confused with the
11478 outer declaration. In particular, the inner version should
11479 have a template parameter of level 2, not level 1. This
11480 would be particularly important if the member declaration
11483 template <class V = U> friend struct S1;
11485 say, when we should tsubst into `U' when instantiating
11486 S2. On the other hand, when presented with:
11496 we must find the inner binding eventually. We
11497 accomplish this by making sure that the new type we
11498 create to represent this declaration has the right
11500 context = TYPE_CONTEXT (t);
11506 /* If no such tag is yet defined, create a forward-reference node
11507 and record it as the "definition".
11508 When a real declaration of this type is found,
11509 the forward-reference will be altered into a real type. */
11510 if (code == ENUMERAL_TYPE)
11512 error ("use of enum %q#D without previous declaration", name);
11513 return error_mark_node;
11517 t = make_class_type (code);
11518 TYPE_CONTEXT (t) = context;
11519 t = pushtag (name, t, scope);
11524 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11526 if (!redeclare_class_template (t, current_template_parms))
11527 return error_mark_node;
11529 else if (!processing_template_decl
11530 && CLASS_TYPE_P (t)
11531 && CLASSTYPE_IS_TEMPLATE (t))
11533 error ("redeclaration of %qT as a non-template", t);
11534 error ("previous declaration %q+D", t);
11535 return error_mark_node;
11538 /* Make injected friend class visible. */
11539 if (scope != ts_within_enclosing_non_class
11540 && hidden_name_p (TYPE_NAME (t)))
11542 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11543 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11545 if (TYPE_TEMPLATE_INFO (t))
11547 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11548 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11556 /* Wrapper for xref_tag_1. */
11559 xref_tag (enum tag_types tag_code, tree name,
11560 tag_scope scope, bool template_header_p)
11563 timevar_start (TV_NAME_LOOKUP);
11564 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11565 timevar_stop (TV_NAME_LOOKUP);
11571 xref_tag_from_type (tree old, tree id, tag_scope scope)
11573 enum tag_types tag_kind;
11575 if (TREE_CODE (old) == RECORD_TYPE)
11576 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11578 tag_kind = union_type;
11580 if (id == NULL_TREE)
11581 id = TYPE_IDENTIFIER (old);
11583 return xref_tag (tag_kind, id, scope, false);
11586 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11587 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11588 access_* node, and the TREE_VALUE is the type of the base-class.
11589 Non-NULL TREE_TYPE indicates virtual inheritance.
11591 Returns true if the binfo hierarchy was successfully created,
11592 false if an error was detected. */
11595 xref_basetypes (tree ref, tree base_list)
11598 tree binfo, base_binfo;
11599 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11600 unsigned max_bases = 0; /* Maximum direct bases. */
11602 tree default_access;
11603 tree igo_prev; /* Track Inheritance Graph Order. */
11605 if (ref == error_mark_node)
11608 /* The base of a derived class is private by default, all others are
11610 default_access = (TREE_CODE (ref) == RECORD_TYPE
11611 && CLASSTYPE_DECLARED_CLASS (ref)
11612 ? access_private_node : access_public_node);
11614 /* First, make sure that any templates in base-classes are
11615 instantiated. This ensures that if we call ourselves recursively
11616 we do not get confused about which classes are marked and which
11618 basep = &base_list;
11621 tree basetype = TREE_VALUE (*basep);
11623 if (!(processing_template_decl && uses_template_parms (basetype))
11624 && !complete_type_or_else (basetype, NULL))
11625 /* An incomplete type. Remove it from the list. */
11626 *basep = TREE_CHAIN (*basep);
11630 if (TREE_TYPE (*basep))
11632 if (CLASS_TYPE_P (basetype))
11633 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11634 basep = &TREE_CHAIN (*basep);
11638 TYPE_MARKED_P (ref) = 1;
11640 /* The binfo slot should be empty, unless this is an (ill-formed)
11642 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11644 error ("redefinition of %q#T", ref);
11648 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11650 binfo = make_tree_binfo (max_bases);
11652 TYPE_BINFO (ref) = binfo;
11653 BINFO_OFFSET (binfo) = size_zero_node;
11654 BINFO_TYPE (binfo) = ref;
11656 /* Apply base-class info set up to the variants of this type. */
11657 fixup_type_variants (ref);
11661 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11662 /* An aggregate cannot have baseclasses. */
11663 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11665 if (TREE_CODE (ref) == UNION_TYPE)
11667 error ("derived union %qT invalid", ref);
11674 if (TYPE_FOR_JAVA (ref))
11676 error ("Java class %qT cannot have multiple bases", ref);
11683 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11685 if (TYPE_FOR_JAVA (ref))
11687 error ("Java class %qT cannot have virtual bases", ref);
11692 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11694 tree access = TREE_PURPOSE (base_list);
11695 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11696 tree basetype = TREE_VALUE (base_list);
11698 if (access == access_default_node)
11699 access = default_access;
11701 if (PACK_EXPANSION_P (basetype))
11702 basetype = PACK_EXPANSION_PATTERN (basetype);
11703 if (TREE_CODE (basetype) == TYPE_DECL)
11704 basetype = TREE_TYPE (basetype);
11705 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11707 error ("base type %qT fails to be a struct or class type",
11712 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11713 TYPE_FOR_JAVA (ref) = 1;
11715 base_binfo = NULL_TREE;
11716 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11718 base_binfo = TYPE_BINFO (basetype);
11719 /* The original basetype could have been a typedef'd type. */
11720 basetype = BINFO_TYPE (base_binfo);
11722 /* Inherit flags from the base. */
11723 TYPE_HAS_NEW_OPERATOR (ref)
11724 |= TYPE_HAS_NEW_OPERATOR (basetype);
11725 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11726 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11727 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11728 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11729 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11730 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11731 CLASSTYPE_REPEATED_BASE_P (ref)
11732 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11735 /* We must do this test after we've seen through a typedef
11737 if (TYPE_MARKED_P (basetype))
11739 if (basetype == ref)
11740 error ("recursive type %qT undefined", basetype);
11742 error ("duplicate base type %qT invalid", basetype);
11746 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11747 /* Regenerate the pack expansion for the bases. */
11748 basetype = make_pack_expansion (basetype);
11750 TYPE_MARKED_P (basetype) = 1;
11752 base_binfo = copy_binfo (base_binfo, basetype, ref,
11753 &igo_prev, via_virtual);
11754 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11755 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11757 BINFO_BASE_APPEND (binfo, base_binfo);
11758 BINFO_BASE_ACCESS_APPEND (binfo, access);
11761 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11762 /* If we have space in the vbase vector, we must have shared at
11763 least one of them, and are therefore diamond shaped. */
11764 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11766 /* Unmark all the types. */
11767 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11768 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11769 TYPE_MARKED_P (ref) = 0;
11771 /* Now see if we have a repeated base type. */
11772 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11774 for (base_binfo = binfo; base_binfo;
11775 base_binfo = TREE_CHAIN (base_binfo))
11777 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11779 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11782 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11784 for (base_binfo = binfo; base_binfo;
11785 base_binfo = TREE_CHAIN (base_binfo))
11786 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11787 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11796 /* Copies the enum-related properties from type SRC to type DST.
11797 Used with the underlying type of an enum and the enum itself. */
11799 copy_type_enum (tree dst, tree src)
11801 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11802 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11803 TYPE_SIZE (dst) = TYPE_SIZE (src);
11804 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11805 SET_TYPE_MODE (dst, TYPE_MODE (src));
11806 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11807 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11808 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11809 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11812 /* Begin compiling the definition of an enumeration type.
11815 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11817 UNDERLYING_TYPE is the type that will be used as the storage for
11818 the enumeration type. This should be NULL_TREE if no storage type
11821 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11823 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11825 Returns the type object, as yet incomplete.
11826 Also records info about it so that build_enumerator
11827 may be used to declare the individual values as they are read. */
11830 start_enum (tree name, tree enumtype, tree underlying_type,
11831 bool scoped_enum_p, bool *is_new)
11833 tree prevtype = NULL_TREE;
11834 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11838 /* [C++0x dcl.enum]p5:
11840 If not explicitly specified, the underlying type of a scoped
11841 enumeration type is int. */
11842 if (!underlying_type && scoped_enum_p)
11843 underlying_type = integer_type_node;
11845 if (underlying_type)
11846 underlying_type = cv_unqualified (underlying_type);
11848 /* If this is the real definition for a previous forward reference,
11849 fill in the contents in the same object that used to be the
11850 forward reference. */
11852 enumtype = lookup_and_check_tag (enum_type, name,
11853 /*tag_scope=*/ts_current,
11854 /*template_header_p=*/false);
11856 /* In case of a template_decl, the only check that should be deferred
11857 to instantiation time is the comparison of underlying types. */
11858 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11860 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11862 error_at (input_location, "scoped/unscoped mismatch "
11863 "in enum %q#T", enumtype);
11864 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11865 "previous definition here");
11866 enumtype = error_mark_node;
11868 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11870 error_at (input_location, "underlying type mismatch "
11871 "in enum %q#T", enumtype);
11872 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11873 "previous definition here");
11874 enumtype = error_mark_node;
11876 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11877 && !dependent_type_p (underlying_type)
11878 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11879 && !same_type_p (underlying_type,
11880 ENUM_UNDERLYING_TYPE (enumtype)))
11882 error_at (input_location, "different underlying type "
11883 "in enum %q#T", enumtype);
11884 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11885 "previous definition here");
11886 underlying_type = NULL_TREE;
11890 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11891 || processing_template_decl)
11893 /* In case of error, make a dummy enum to allow parsing to
11895 if (enumtype == error_mark_node)
11897 name = make_anon_name ();
11898 enumtype = NULL_TREE;
11901 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11902 of an opaque enum, or an opaque enum of an already defined
11903 enumeration (C++0x only).
11904 In any other case, it'll be NULL_TREE. */
11910 prevtype = enumtype;
11911 enumtype = cxx_make_type (ENUMERAL_TYPE);
11912 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11913 if (enumtype == error_mark_node)
11914 return error_mark_node;
11916 /* The enum is considered opaque until the opening '{' of the
11917 enumerator list. */
11918 SET_OPAQUE_ENUM_P (enumtype, true);
11919 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11922 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11924 if (underlying_type)
11926 if (CP_INTEGRAL_TYPE_P (underlying_type))
11928 copy_type_enum (enumtype, underlying_type);
11929 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11931 else if (dependent_type_p (underlying_type))
11932 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11934 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11935 underlying_type, enumtype);
11938 /* If into a template class, the returned enum is always the first
11939 declaration (opaque or not) seen. This way all the references to
11940 this type will be to the same declaration. The following ones are used
11941 only to check for definition errors. */
11942 if (prevtype && processing_template_decl)
11948 /* After processing and defining all the values of an enumeration type,
11949 install their decls in the enumeration type.
11950 ENUMTYPE is the type object. */
11953 finish_enum_value_list (tree enumtype)
11956 tree underlying_type;
11959 tree minnode, maxnode;
11962 bool fixed_underlying_type_p
11963 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11965 /* We built up the VALUES in reverse order. */
11966 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11968 /* For an enum defined in a template, just set the type of the values;
11969 all further processing is postponed until the template is
11970 instantiated. We need to set the type so that tsubst of a CONST_DECL
11972 if (processing_template_decl)
11974 for (values = TYPE_VALUES (enumtype);
11976 values = TREE_CHAIN (values))
11977 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11981 /* Determine the minimum and maximum values of the enumerators. */
11982 if (TYPE_VALUES (enumtype))
11984 minnode = maxnode = NULL_TREE;
11986 for (values = TYPE_VALUES (enumtype);
11988 values = TREE_CHAIN (values))
11990 decl = TREE_VALUE (values);
11992 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11993 each enumerator has the type of its enumeration. Prior to the
11994 closing brace, the type of each enumerator is the type of its
11995 initializing value. */
11996 TREE_TYPE (decl) = enumtype;
11998 /* Update the minimum and maximum values, if appropriate. */
11999 value = DECL_INITIAL (decl);
12000 if (value == error_mark_node)
12001 value = integer_zero_node;
12002 /* Figure out what the minimum and maximum values of the
12003 enumerators are. */
12005 minnode = maxnode = value;
12006 else if (tree_int_cst_lt (maxnode, value))
12008 else if (tree_int_cst_lt (value, minnode))
12015 If the enumerator-list is empty, the underlying type is as if
12016 the enumeration had a single enumerator with value 0. */
12017 minnode = maxnode = integer_zero_node;
12019 if (!fixed_underlying_type_p)
12021 /* Compute the number of bits require to represent all values of the
12022 enumeration. We must do this before the type of MINNODE and
12023 MAXNODE are transformed, since tree_int_cst_min_precision relies
12024 on the TREE_TYPE of the value it is passed. */
12025 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12026 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12027 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12028 int precision = MAX (lowprec, highprec);
12030 bool use_short_enum;
12032 /* Determine the underlying type of the enumeration.
12036 The underlying type of an enumeration is an integral type that
12037 can represent all the enumerator values defined in the
12038 enumeration. It is implementation-defined which integral type is
12039 used as the underlying type for an enumeration except that the
12040 underlying type shall not be larger than int unless the value of
12041 an enumerator cannot fit in an int or unsigned int.
12043 We use "int" or an "unsigned int" as the underlying type, even if
12044 a smaller integral type would work, unless the user has
12045 explicitly requested that we use the smallest possible type. The
12046 user can request that for all enumerations with a command line
12047 flag, or for just one enumeration with an attribute. */
12049 use_short_enum = flag_short_enums
12050 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12052 for (itk = (use_short_enum ? itk_char : itk_int);
12056 underlying_type = integer_types[itk];
12057 if (underlying_type != NULL_TREE
12058 && TYPE_PRECISION (underlying_type) >= precision
12059 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12062 if (itk == itk_none)
12066 IF no integral type can represent all the enumerator values, the
12067 enumeration is ill-formed. */
12068 error ("no integral type can represent all of the enumerator values "
12069 "for %qT", enumtype);
12070 precision = TYPE_PRECISION (long_long_integer_type_node);
12071 underlying_type = integer_types[itk_unsigned_long_long];
12076 The value of sizeof() applied to an enumeration type, an object
12077 of an enumeration type, or an enumerator, is the value of sizeof()
12078 applied to the underlying type. */
12079 copy_type_enum (enumtype, underlying_type);
12081 /* Compute the minimum and maximum values for the type.
12085 For an enumeration where emin is the smallest enumerator and emax
12086 is the largest, the values of the enumeration are the values of the
12087 underlying type in the range bmin to bmax, where bmin and bmax are,
12088 respectively, the smallest and largest values of the smallest bit-
12089 field that can store emin and emax. */
12091 /* The middle-end currently assumes that types with TYPE_PRECISION
12092 narrower than their underlying type are suitably zero or sign
12093 extended to fill their mode. Similarly, it assumes that the front
12094 end assures that a value of a particular type must be within
12095 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12097 We used to set these fields based on bmin and bmax, but that led
12098 to invalid assumptions like optimizing away bounds checking. So
12099 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12100 TYPE_MAX_VALUE to the values for the mode above and only restrict
12101 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12102 ENUM_UNDERLYING_TYPE (enumtype)
12103 = build_distinct_type_copy (underlying_type);
12104 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12105 set_min_and_max_values_for_integral_type
12106 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12108 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12109 if (flag_strict_enums)
12110 set_min_and_max_values_for_integral_type (enumtype, precision,
12114 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12116 /* Convert each of the enumerators to the type of the underlying
12117 type of the enumeration. */
12118 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12120 location_t saved_location;
12122 decl = TREE_VALUE (values);
12123 saved_location = input_location;
12124 input_location = DECL_SOURCE_LOCATION (decl);
12125 if (fixed_underlying_type_p)
12126 /* If the enumeration type has a fixed underlying type, we
12127 already checked all of the enumerator values. */
12128 value = DECL_INITIAL (decl);
12130 value = perform_implicit_conversion (underlying_type,
12131 DECL_INITIAL (decl),
12132 tf_warning_or_error);
12133 input_location = saved_location;
12135 /* Do not clobber shared ints. */
12136 value = copy_node (value);
12138 TREE_TYPE (value) = enumtype;
12139 DECL_INITIAL (decl) = value;
12142 /* Fix up all variant types of this enum type. */
12143 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12144 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12146 /* Finish debugging output for this type. */
12147 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12150 /* Finishes the enum type. This is called only the first time an
12151 enumeration is seen, be it opaque or odinary.
12152 ENUMTYPE is the type object. */
12155 finish_enum (tree enumtype)
12157 if (processing_template_decl)
12159 if (at_function_scope_p ())
12160 add_stmt (build_min (TAG_DEFN, enumtype));
12164 /* Here there should not be any variants of this type. */
12165 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12166 && !TYPE_NEXT_VARIANT (enumtype));
12169 /* Build and install a CONST_DECL for an enumeration constant of the
12170 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12171 LOC is the location of NAME.
12172 Assignment of sequential values by default is handled here. */
12175 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12181 /* If the VALUE was erroneous, pretend it wasn't there; that will
12182 result in the enum being assigned the next value in sequence. */
12183 if (value == error_mark_node)
12186 /* Remove no-op casts from the value. */
12188 STRIP_TYPE_NOPS (value);
12190 if (! processing_template_decl)
12192 /* Validate and default VALUE. */
12193 if (value != NULL_TREE)
12195 value = cxx_constant_value (value);
12197 if (TREE_CODE (value) == INTEGER_CST
12198 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12200 value = perform_integral_promotions (value);
12204 error ("enumerator value for %qD is not an integer constant", name);
12209 /* Default based on previous value. */
12210 if (value == NULL_TREE)
12212 if (TYPE_VALUES (enumtype))
12215 unsigned HOST_WIDE_INT lo;
12219 /* C++03 7.2/4: If no initializer is specified for the first
12220 enumerator, the type is an unspecified integral
12221 type. Otherwise the type is the same as the type of the
12222 initializing value of the preceding enumerator unless the
12223 incremented value is not representable in that type, in
12224 which case the type is an unspecified integral type
12225 sufficient to contain the incremented value. */
12226 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12227 if (error_operand_p (prev_value))
12228 value = error_mark_node;
12231 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12232 TREE_INT_CST_HIGH (prev_value),
12237 tree type = TREE_TYPE (prev_value);
12238 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12239 di.low = lo; di.high = hi;
12240 if (!double_int_fits_to_tree_p (type, di))
12243 for (itk = itk_int; itk != itk_none; itk++)
12245 type = integer_types[itk];
12246 if (type != NULL_TREE
12247 && (pos || !TYPE_UNSIGNED (type))
12248 && double_int_fits_to_tree_p (type, di))
12251 if (type && cxx_dialect < cxx0x
12252 && itk > itk_unsigned_long)
12253 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12254 incremented enumerator value is too large for %<unsigned long%>" : "\
12255 incremented enumerator value is too large for %<long%>");
12257 if (type == NULL_TREE)
12260 value = double_int_to_tree (type, di);
12265 error ("overflow in enumeration values at %qD", name);
12266 value = error_mark_node;
12271 value = integer_zero_node;
12274 /* Remove no-op casts from the value. */
12275 STRIP_TYPE_NOPS (value);
12277 /* If the underlying type of the enum is fixed, check whether
12278 the enumerator values fits in the underlying type. If it
12279 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12280 if (ENUM_UNDERLYING_TYPE (enumtype)
12282 && TREE_CODE (value) == INTEGER_CST
12283 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12285 error ("enumerator value %E is too large for underlying type %<%T%>",
12286 value, ENUM_UNDERLYING_TYPE (enumtype));
12288 /* Silently convert the value so that we can continue. */
12289 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12294 /* C++ associates enums with global, function, or class declarations. */
12295 context = current_scope ();
12297 /* Build the actual enumeration constant. Note that the enumeration
12298 constants have the underlying type of the enum (if it is fixed)
12299 or the type of their initializer (if the underlying type of the
12300 enum is not fixed):
12304 If the underlying type is fixed, the type of each enumerator
12305 prior to the closing brace is the underlying type; if the
12306 initializing value of an enumerator cannot be represented by
12307 the underlying type, the program is ill-formed. If the
12308 underlying type is not fixed, the type of each enumerator is
12309 the type of its initializing value.
12311 If the underlying type is not fixed, it will be computed by
12312 finish_enum and we will reset the type of this enumerator. Of
12313 course, if we're processing a template, there may be no value. */
12314 type = value ? TREE_TYPE (value) : NULL_TREE;
12316 if (context && context == current_class_type)
12317 /* This enum declaration is local to the class. We need the full
12318 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12319 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12321 /* It's a global enum, or it's local to a function. (Note local to
12322 a function could mean local to a class method. */
12323 decl = build_decl (loc, CONST_DECL, name, type);
12325 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12326 TREE_CONSTANT (decl) = 1;
12327 TREE_READONLY (decl) = 1;
12328 DECL_INITIAL (decl) = value;
12330 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12331 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12332 on the TYPE_FIELDS list for `S'. (That's so that you can say
12333 things like `S::i' later.) */
12334 finish_member_declaration (decl);
12338 /* Add this enumeration constant to the list for this type. */
12339 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12342 /* Look for an enumerator with the given NAME within the enumeration
12343 type ENUMTYPE. This routine is used primarily for qualified name
12344 lookup into an enumerator in C++0x, e.g.,
12346 enum class Color { Red, Green, Blue };
12348 Color color = Color::Red;
12350 Returns the value corresponding to the enumerator, or
12351 NULL_TREE if no such enumerator was found. */
12353 lookup_enumerator (tree enumtype, tree name)
12356 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12358 e = purpose_member (name, TYPE_VALUES (enumtype));
12359 return e? TREE_VALUE (e) : NULL_TREE;
12363 /* We're defining DECL. Make sure that its type is OK. */
12366 check_function_type (tree decl, tree current_function_parms)
12368 tree fntype = TREE_TYPE (decl);
12369 tree return_type = complete_type (TREE_TYPE (fntype));
12371 /* In a function definition, arg types must be complete. */
12372 require_complete_types_for_parms (current_function_parms);
12374 if (dependent_type_p (return_type))
12376 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12377 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12379 tree args = TYPE_ARG_TYPES (fntype);
12381 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12382 error ("return type %q#T is incomplete", return_type);
12384 error ("return type has Java class type %q#T", return_type);
12386 /* Make it return void instead. */
12387 if (TREE_CODE (fntype) == METHOD_TYPE)
12388 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12390 TREE_CHAIN (args));
12392 fntype = build_function_type (void_type_node, args);
12394 = build_exception_variant (fntype,
12395 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12396 fntype = (cp_build_type_attribute_variant
12397 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12398 TREE_TYPE (decl) = fntype;
12401 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12404 /* Create the FUNCTION_DECL for a function definition.
12405 DECLSPECS and DECLARATOR are the parts of the declaration;
12406 they describe the function's name and the type it returns,
12407 but twisted together in a fashion that parallels the syntax of C.
12409 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12410 DECLARATOR is really the DECL for the function we are about to
12411 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12412 indicating that the function is an inline defined in-class.
12414 This function creates a binding context for the function body
12415 as well as setting up the FUNCTION_DECL in current_function_decl.
12417 For C++, we must first check whether that datum makes any sense.
12418 For example, "class A local_a(1,2);" means that variable local_a
12419 is an aggregate of type A, which should have a constructor
12420 applied to it with the argument list [1, 2].
12422 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12423 or may be a BLOCK if the function has been defined previously
12424 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12425 error_mark_node if the function has never been defined, or
12426 a BLOCK if the function has been defined somewhere. */
12429 start_preparsed_function (tree decl1, tree attrs, int flags)
12431 tree ctype = NULL_TREE;
12434 int doing_friend = 0;
12435 struct cp_binding_level *bl;
12436 tree current_function_parms;
12437 struct c_fileinfo *finfo
12438 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12439 bool honor_interface;
12441 /* Sanity check. */
12442 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12443 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12445 fntype = TREE_TYPE (decl1);
12446 if (TREE_CODE (fntype) == METHOD_TYPE)
12447 ctype = TYPE_METHOD_BASETYPE (fntype);
12449 /* ISO C++ 11.4/5. A friend function defined in a class is in
12450 the (lexical) scope of the class in which it is defined. */
12451 if (!ctype && DECL_FRIEND_P (decl1))
12453 ctype = DECL_FRIEND_CONTEXT (decl1);
12455 /* CTYPE could be null here if we're dealing with a template;
12456 for example, `inline friend float foo()' inside a template
12457 will have no CTYPE set. */
12458 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12464 if (DECL_DECLARED_INLINE_P (decl1)
12465 && lookup_attribute ("noinline", attrs))
12466 warning (0, "inline function %q+D given attribute noinline", decl1);
12468 /* Handle gnu_inline attribute. */
12469 if (GNU_INLINE_P (decl1))
12471 DECL_EXTERNAL (decl1) = 1;
12472 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12473 DECL_INTERFACE_KNOWN (decl1) = 1;
12474 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12477 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12478 /* This is a constructor, we must ensure that any default args
12479 introduced by this definition are propagated to the clones
12480 now. The clones are used directly in overload resolution. */
12481 adjust_clone_args (decl1);
12483 /* Sometimes we don't notice that a function is a static member, and
12484 build a METHOD_TYPE for it. Fix that up now. */
12485 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12486 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12488 /* Set up current_class_type, and enter the scope of the class, if
12491 push_nested_class (ctype);
12492 else if (DECL_STATIC_FUNCTION_P (decl1))
12493 push_nested_class (DECL_CONTEXT (decl1));
12495 /* Now that we have entered the scope of the class, we must restore
12496 the bindings for any template parameters surrounding DECL1, if it
12497 is an inline member template. (Order is important; consider the
12498 case where a template parameter has the same name as a field of
12499 the class.) It is not until after this point that
12500 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12501 if (flags & SF_INCLASS_INLINE)
12502 maybe_begin_member_template_processing (decl1);
12504 /* Effective C++ rule 15. */
12506 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12507 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12508 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12510 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12511 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12512 if (!DECL_INITIAL (decl1))
12513 DECL_INITIAL (decl1) = error_mark_node;
12515 /* This function exists in static storage.
12516 (This does not mean `static' in the C sense!) */
12517 TREE_STATIC (decl1) = 1;
12519 /* We must call push_template_decl after current_class_type is set
12520 up. (If we are processing inline definitions after exiting a
12521 class scope, current_class_type will be NULL_TREE until set above
12522 by push_nested_class.) */
12523 if (processing_template_decl)
12525 /* FIXME: Handle error_mark_node more gracefully. */
12526 tree newdecl1 = push_template_decl (decl1);
12527 if (newdecl1 != error_mark_node)
12531 /* We are now in the scope of the function being defined. */
12532 current_function_decl = decl1;
12534 /* Save the parm names or decls from this function's declarator
12535 where store_parm_decls will find them. */
12536 current_function_parms = DECL_ARGUMENTS (decl1);
12538 /* Make sure the parameter and return types are reasonable. When
12539 you declare a function, these types can be incomplete, but they
12540 must be complete when you define the function. */
12541 check_function_type (decl1, current_function_parms);
12543 /* Build the return declaration for the function. */
12544 restype = TREE_TYPE (fntype);
12545 if (DECL_RESULT (decl1) == NULL_TREE)
12549 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12550 DECL_ARTIFICIAL (resdecl) = 1;
12551 DECL_IGNORED_P (resdecl) = 1;
12552 DECL_RESULT (decl1) = resdecl;
12554 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12557 /* Let the user know we're compiling this function. */
12558 announce_function (decl1);
12560 /* Record the decl so that the function name is defined.
12561 If we already have a decl for this name, and it is a FUNCTION_DECL,
12562 use the old decl. */
12563 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12565 /* A specialization is not used to guide overload resolution. */
12566 if (!DECL_FUNCTION_MEMBER_P (decl1)
12567 && !(DECL_USE_TEMPLATE (decl1) &&
12568 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12570 tree olddecl = pushdecl (decl1);
12572 if (olddecl == error_mark_node)
12573 /* If something went wrong when registering the declaration,
12574 use DECL1; we have to have a FUNCTION_DECL to use when
12575 parsing the body of the function. */
12579 /* Otherwise, OLDDECL is either a previous declaration
12580 of the same function or DECL1 itself. */
12582 if (warn_missing_declarations
12583 && olddecl == decl1
12584 && !DECL_MAIN_P (decl1)
12585 && TREE_PUBLIC (decl1)
12586 && !DECL_DECLARED_INLINE_P (decl1))
12590 /* Check whether DECL1 is in an anonymous
12592 for (context = DECL_CONTEXT (decl1);
12594 context = DECL_CONTEXT (context))
12596 if (TREE_CODE (context) == NAMESPACE_DECL
12597 && DECL_NAME (context) == NULL_TREE)
12601 if (context == NULL)
12602 warning (OPT_Wmissing_declarations,
12603 "no previous declaration for %q+D", decl1);
12611 /* We need to set the DECL_CONTEXT. */
12612 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12613 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12615 fntype = TREE_TYPE (decl1);
12617 /* If #pragma weak applies, mark the decl appropriately now.
12618 The pragma only applies to global functions. Because
12619 determining whether or not the #pragma applies involves
12620 computing the mangled name for the declaration, we cannot
12621 apply the pragma until after we have merged this declaration
12622 with any previous declarations; if the original declaration
12623 has a linkage specification, that specification applies to
12624 the definition as well, and may affect the mangled name. */
12625 if (DECL_FILE_SCOPE_P (decl1))
12626 maybe_apply_pragma_weak (decl1);
12629 /* constexpr functions must have literal argument types and
12630 literal return type. */
12631 validate_constexpr_fundecl (decl1);
12633 /* Reset this in case the call to pushdecl changed it. */
12634 current_function_decl = decl1;
12636 gcc_assert (DECL_INITIAL (decl1));
12638 /* This function may already have been parsed, in which case just
12639 return; our caller will skip over the body without parsing. */
12640 if (DECL_INITIAL (decl1) != error_mark_node)
12643 /* Initialize RTL machinery. We cannot do this until
12644 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12645 even when processing a template; this is how we get
12646 CFUN set up, and our per-function variables initialized.
12647 FIXME factor out the non-RTL stuff. */
12648 bl = current_binding_level;
12649 allocate_struct_function (decl1, processing_template_decl);
12651 /* Initialize the language data structures. Whenever we start
12652 a new function, we destroy temporaries in the usual way. */
12653 cfun->language = ggc_alloc_cleared_language_function ();
12654 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12655 current_binding_level = bl;
12657 /* Start the statement-tree, start the tree now. */
12658 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12660 /* If we are (erroneously) defining a function that we have already
12661 defined before, wipe out what we knew before. */
12662 if (!DECL_PENDING_INLINE_P (decl1))
12663 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12665 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12667 /* We know that this was set up by `grokclassfn'. We do not
12668 wait until `store_parm_decls', since evil parse errors may
12669 never get us to that point. Here we keep the consistency
12670 between `current_class_type' and `current_class_ptr'. */
12671 tree t = DECL_ARGUMENTS (decl1);
12673 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12674 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12676 cp_function_chain->x_current_class_ref
12677 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12678 cp_function_chain->x_current_class_ptr = t;
12680 /* Constructors and destructors need to know whether they're "in
12681 charge" of initializing virtual base classes. */
12682 t = DECL_CHAIN (t);
12683 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12685 current_in_charge_parm = t;
12686 t = DECL_CHAIN (t);
12688 if (DECL_HAS_VTT_PARM_P (decl1))
12690 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12691 current_vtt_parm = t;
12695 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12696 /* Implicitly-defined methods (like the
12697 destructor for a class in which no destructor
12698 is explicitly declared) must not be defined
12699 until their definition is needed. So, we
12700 ignore interface specifications for
12701 compiler-generated functions. */
12702 && !DECL_ARTIFICIAL (decl1));
12704 if (processing_template_decl)
12705 /* Don't mess with interface flags. */;
12706 else if (DECL_INTERFACE_KNOWN (decl1))
12708 tree ctx = decl_function_context (decl1);
12710 if (DECL_NOT_REALLY_EXTERN (decl1))
12711 DECL_EXTERNAL (decl1) = 0;
12713 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12714 && TREE_PUBLIC (ctx))
12715 /* This is a function in a local class in an extern inline
12717 comdat_linkage (decl1);
12719 /* If this function belongs to an interface, it is public.
12720 If it belongs to someone else's interface, it is also external.
12721 This only affects inlines and template instantiations. */
12722 else if (!finfo->interface_unknown && honor_interface)
12724 if (DECL_DECLARED_INLINE_P (decl1)
12725 || DECL_TEMPLATE_INSTANTIATION (decl1))
12727 DECL_EXTERNAL (decl1)
12728 = (finfo->interface_only
12729 || (DECL_DECLARED_INLINE_P (decl1)
12730 && ! flag_implement_inlines
12731 && !DECL_VINDEX (decl1)));
12733 /* For WIN32 we also want to put these in linkonce sections. */
12734 maybe_make_one_only (decl1);
12737 DECL_EXTERNAL (decl1) = 0;
12738 DECL_INTERFACE_KNOWN (decl1) = 1;
12739 /* If this function is in an interface implemented in this file,
12740 make sure that the back end knows to emit this function
12742 if (!DECL_EXTERNAL (decl1))
12743 mark_needed (decl1);
12745 else if (finfo->interface_unknown && finfo->interface_only
12746 && honor_interface)
12748 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12749 interface, we will have both finfo->interface_unknown and
12750 finfo->interface_only set. In that case, we don't want to
12751 use the normal heuristics because someone will supply a
12752 #pragma implementation elsewhere, and deducing it here would
12753 produce a conflict. */
12754 comdat_linkage (decl1);
12755 DECL_EXTERNAL (decl1) = 0;
12756 DECL_INTERFACE_KNOWN (decl1) = 1;
12757 DECL_DEFER_OUTPUT (decl1) = 1;
12761 /* This is a definition, not a reference.
12762 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12763 if (!GNU_INLINE_P (decl1))
12764 DECL_EXTERNAL (decl1) = 0;
12766 if ((DECL_DECLARED_INLINE_P (decl1)
12767 || DECL_TEMPLATE_INSTANTIATION (decl1))
12768 && ! DECL_INTERFACE_KNOWN (decl1))
12769 DECL_DEFER_OUTPUT (decl1) = 1;
12771 DECL_INTERFACE_KNOWN (decl1) = 1;
12774 /* Determine the ELF visibility attribute for the function. We must not
12775 do this before calling "pushdecl", as we must allow "duplicate_decls"
12776 to merge any attributes appropriately. We also need to wait until
12778 if (!DECL_CLONED_FUNCTION_P (decl1))
12779 determine_visibility (decl1);
12781 begin_scope (sk_function_parms, decl1);
12785 if (DECL_DESTRUCTOR_P (decl1)
12786 || (DECL_CONSTRUCTOR_P (decl1)
12787 && targetm.cxx.cdtor_returns_this ()))
12789 cdtor_label = build_decl (input_location,
12790 LABEL_DECL, NULL_TREE, NULL_TREE);
12791 DECL_CONTEXT (cdtor_label) = current_function_decl;
12794 start_fname_decls ();
12796 store_parm_decls (current_function_parms);
12800 /* Like start_preparsed_function, except that instead of a
12801 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12803 Returns 1 on success. If the DECLARATOR is not suitable for a function
12804 (it defines a datum instead), we return 0, which tells
12805 yyparse to report a parse error. */
12808 start_function (cp_decl_specifier_seq *declspecs,
12809 const cp_declarator *declarator,
12814 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12815 if (decl1 == error_mark_node)
12817 /* If the declarator is not suitable for a function definition,
12818 cause a syntax error. */
12819 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12821 error ("invalid function declaration");
12825 if (DECL_MAIN_P (decl1))
12826 /* main must return int. grokfndecl should have corrected it
12827 (and issued a diagnostic) if the user got it wrong. */
12828 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12829 integer_type_node));
12831 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12836 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12840 use_eh_spec_block (tree fn)
12842 return (flag_exceptions && flag_enforce_eh_specs
12843 && !processing_template_decl
12844 && !type_throw_all_p (TREE_TYPE (fn))
12845 /* We insert the EH_SPEC_BLOCK only in the original
12846 function; then, it is copied automatically to the
12848 && !DECL_CLONED_FUNCTION_P (fn)
12849 /* Implicitly-generated constructors and destructors have
12850 exception specifications. However, those specifications
12851 are the union of the possible exceptions specified by the
12852 constructors/destructors for bases and members, so no
12853 unallowed exception will ever reach this function. By
12854 not creating the EH_SPEC_BLOCK we save a little memory,
12855 and we avoid spurious warnings about unreachable
12857 && !DECL_DEFAULTED_FN (fn));
12860 /* Store the parameter declarations into the current function declaration.
12861 This is called after parsing the parameter declarations, before
12862 digesting the body of the function.
12864 Also install to binding contour return value identifier, if any. */
12867 store_parm_decls (tree current_function_parms)
12869 tree fndecl = current_function_decl;
12872 /* This is a chain of any other decls that came in among the parm
12873 declarations. If a parm is declared with enum {foo, bar} x;
12874 then CONST_DECLs for foo and bar are put here. */
12875 tree nonparms = NULL_TREE;
12877 if (current_function_parms)
12879 /* This case is when the function was defined with an ANSI prototype.
12880 The parms already have decls, so we need not do anything here
12881 except record them as in effect
12882 and complain if any redundant old-style parm decls were written. */
12884 tree specparms = current_function_parms;
12887 /* Must clear this because it might contain TYPE_DECLs declared
12889 current_binding_level->names = NULL;
12891 /* If we're doing semantic analysis, then we'll call pushdecl
12892 for each of these. We must do them in reverse order so that
12893 they end in the correct forward order. */
12894 specparms = nreverse (specparms);
12896 for (parm = specparms; parm; parm = next)
12898 next = DECL_CHAIN (parm);
12899 if (TREE_CODE (parm) == PARM_DECL)
12901 if (DECL_NAME (parm) == NULL_TREE
12902 || TREE_CODE (parm) != VOID_TYPE)
12905 error ("parameter %qD declared void", parm);
12909 /* If we find an enum constant or a type tag,
12910 put it aside for the moment. */
12911 TREE_CHAIN (parm) = NULL_TREE;
12912 nonparms = chainon (nonparms, parm);
12916 /* Get the decls in their original chain order and record in the
12917 function. This is all and only the PARM_DECLs that were
12918 pushed into scope by the loop above. */
12919 DECL_ARGUMENTS (fndecl) = getdecls ();
12922 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12924 /* Now store the final chain of decls for the arguments
12925 as the decl-chain of the current lexical scope.
12926 Put the enumerators in as well, at the front so that
12927 DECL_ARGUMENTS is not modified. */
12928 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12930 if (use_eh_spec_block (current_function_decl))
12931 current_eh_spec_block = begin_eh_spec_block ();
12935 /* We have finished doing semantic analysis on DECL, but have not yet
12936 generated RTL for its body. Save away our current state, so that
12937 when we want to generate RTL later we know what to do. */
12940 save_function_data (tree decl)
12942 struct language_function *f;
12944 /* Save the language-specific per-function data so that we can
12945 get it back when we really expand this function. */
12946 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12949 f = ggc_alloc_language_function ();
12950 memcpy (f, cp_function_chain, sizeof (struct language_function));
12951 DECL_SAVED_FUNCTION_DATA (decl) = f;
12953 /* Clear out the bits we don't need. */
12954 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12955 f->bindings = NULL;
12956 f->x_local_names = NULL;
12960 /* Set the return value of the constructor (if present). */
12963 finish_constructor_body (void)
12968 if (targetm.cxx.cdtor_returns_this ()
12969 && (! TYPE_FOR_JAVA (current_class_type)))
12971 /* Any return from a constructor will end up here. */
12972 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12974 val = DECL_ARGUMENTS (current_function_decl);
12975 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12976 DECL_RESULT (current_function_decl), val);
12977 /* Return the address of the object. */
12978 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12979 add_stmt (exprstmt);
12983 /* Do all the processing for the beginning of a destructor; set up the
12984 vtable pointers and cleanups for bases and members. */
12987 begin_destructor_body (void)
12989 tree compound_stmt;
12991 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12992 issued an error message. We still want to try to process the
12993 body of the function, but initialize_vtbl_ptrs will crash if
12994 TYPE_BINFO is NULL. */
12995 if (COMPLETE_TYPE_P (current_class_type))
12997 compound_stmt = begin_compound_stmt (0);
12998 /* Make all virtual function table pointers in non-virtual base
12999 classes point to CURRENT_CLASS_TYPE's virtual function
13001 initialize_vtbl_ptrs (current_class_ptr);
13002 finish_compound_stmt (compound_stmt);
13004 /* And insert cleanups for our bases and members so that they
13005 will be properly destroyed if we throw. */
13006 push_base_cleanups ();
13010 /* At the end of every destructor we generate code to delete the object if
13011 necessary. Do that now. */
13014 finish_destructor_body (void)
13018 /* Any return from a destructor will end up here; that way all base
13019 and member cleanups will be run when the function returns. */
13020 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13022 /* In a virtual destructor, we must call delete. */
13023 if (DECL_VIRTUAL_P (current_function_decl))
13026 tree virtual_size = cxx_sizeof (current_class_type);
13030 At the point of definition of a virtual destructor (including
13031 an implicit definition), non-placement operator delete shall
13032 be looked up in the scope of the destructor's class and if
13033 found shall be accessible and unambiguous. */
13034 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13036 /*global_p=*/false,
13037 /*placement=*/NULL_TREE,
13038 /*alloc_fn=*/NULL_TREE);
13040 if_stmt = begin_if_stmt ();
13041 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13042 current_in_charge_parm,
13045 finish_expr_stmt (exprstmt);
13046 finish_then_clause (if_stmt);
13047 finish_if_stmt (if_stmt);
13050 if (targetm.cxx.cdtor_returns_this ())
13054 val = DECL_ARGUMENTS (current_function_decl);
13055 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13056 DECL_RESULT (current_function_decl), val);
13057 /* Return the address of the object. */
13058 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13059 add_stmt (exprstmt);
13063 /* Do the necessary processing for the beginning of a function body, which
13064 in this case includes member-initializers, but not the catch clauses of
13065 a function-try-block. Currently, this means opening a binding level
13066 for the member-initializers (in a ctor), member cleanups (in a dtor),
13067 and capture proxies (in a lambda operator()). */
13070 begin_function_body (void)
13074 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13077 if (processing_template_decl)
13078 /* Do nothing now. */;
13080 /* Always keep the BLOCK node associated with the outermost pair of
13081 curly braces of a function. These are needed for correct
13082 operation of dwarfout.c. */
13083 keep_next_level (true);
13085 stmt = begin_compound_stmt (BCS_FN_BODY);
13087 if (processing_template_decl)
13088 /* Do nothing now. */;
13089 else if (DECL_DESTRUCTOR_P (current_function_decl))
13090 begin_destructor_body ();
13095 /* Do the processing for the end of a function body. Currently, this means
13096 closing out the cleanups for fully-constructed bases and members, and in
13097 the case of the destructor, deleting the object if desired. Again, this
13098 is only meaningful for [cd]tors, since they are the only functions where
13099 there is a significant distinction between the main body and any
13100 function catch clauses. Handling, say, main() return semantics here
13101 would be wrong, as flowing off the end of a function catch clause for
13102 main() would also need to return 0. */
13105 finish_function_body (tree compstmt)
13107 if (compstmt == NULL_TREE)
13110 /* Close the block. */
13111 finish_compound_stmt (compstmt);
13113 if (processing_template_decl)
13114 /* Do nothing now. */;
13115 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13116 finish_constructor_body ();
13117 else if (DECL_DESTRUCTOR_P (current_function_decl))
13118 finish_destructor_body ();
13121 /* Given a function, returns the BLOCK corresponding to the outermost level
13122 of curly braces, skipping the artificial block created for constructor
13126 outer_curly_brace_block (tree fndecl)
13128 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13129 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13130 /* Skip the artificial function body block. */
13131 block = BLOCK_SUBBLOCKS (block);
13135 /* If FNDECL is a class's key method, add the class to the list of
13136 keyed classes that should be emitted. */
13139 record_key_method_defined (tree fndecl)
13141 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13142 && DECL_VIRTUAL_P (fndecl)
13143 && !processing_template_decl)
13145 tree fnclass = DECL_CONTEXT (fndecl);
13146 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13147 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13151 /* Subroutine of finish_function.
13152 Save the body of constexpr functions for possible
13153 future compile time evaluation. */
13156 maybe_save_function_definition (tree fun)
13158 if (!processing_template_decl
13159 && DECL_DECLARED_CONSTEXPR_P (fun)
13160 && !DECL_CLONED_FUNCTION_P (fun))
13161 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13164 /* Finish up a function declaration and compile that function
13165 all the way to assembler language output. The free the storage
13166 for the function definition.
13168 FLAGS is a bitwise or of the following values:
13170 We just finished processing the body of an in-class inline
13171 function definition. (This processing will have taken place
13172 after the class definition is complete.) */
13175 finish_function (int flags)
13177 tree fndecl = current_function_decl;
13178 tree fntype, ctype = NULL_TREE;
13179 int inclass_inline = (flags & 2) != 0;
13181 /* When we get some parse errors, we can end up without a
13182 current_function_decl, so cope. */
13183 if (fndecl == NULL_TREE)
13184 return error_mark_node;
13186 if (c_dialect_objc ())
13187 objc_finish_function ();
13189 gcc_assert (!defer_mark_used_calls);
13190 defer_mark_used_calls = true;
13192 record_key_method_defined (fndecl);
13194 fntype = TREE_TYPE (fndecl);
13196 /* TREE_READONLY (fndecl) = 1;
13197 This caused &foo to be of type ptr-to-const-function
13198 which then got a warning when stored in a ptr-to-function variable. */
13200 gcc_assert (building_stmt_list_p ());
13201 /* The current function is being defined, so its DECL_INITIAL should
13202 be set, and unless there's a multiple definition, it should be
13203 error_mark_node. */
13204 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13206 /* For a cloned function, we've already got all the code we need;
13207 there's no need to add any extra bits. */
13208 if (!DECL_CLONED_FUNCTION_P (fndecl))
13210 if (DECL_MAIN_P (current_function_decl))
13214 /* Make it so that `main' always returns 0 by default (or
13217 stmt = finish_return_stmt (integer_one_node);
13219 stmt = finish_return_stmt (integer_zero_node);
13221 /* Hack. We don't want the middle-end to warn that this
13222 return is unreachable, so put the statement on the
13225 location_t linezero = linemap_line_start (line_table, 0, 1);
13226 SET_EXPR_LOCATION (stmt, linezero);
13230 if (use_eh_spec_block (current_function_decl))
13231 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13232 (TREE_TYPE (current_function_decl)),
13233 current_eh_spec_block);
13236 /* If we're saving up tree structure, tie off the function now. */
13237 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13239 finish_fname_decls ();
13241 /* If this function can't throw any exceptions, remember that. */
13242 if (!processing_template_decl
13243 && !cp_function_chain->can_throw
13244 && !flag_non_call_exceptions
13245 && !decl_replaceable_p (fndecl))
13246 TREE_NOTHROW (fndecl) = 1;
13248 /* This must come after expand_function_end because cleanups might
13249 have declarations (from inline functions) that need to go into
13250 this function's blocks. */
13252 /* If the current binding level isn't the outermost binding level
13253 for this function, either there is a bug, or we have experienced
13254 syntax errors and the statement tree is malformed. */
13255 if (current_binding_level->kind != sk_function_parms)
13257 /* Make sure we have already experienced errors. */
13258 gcc_assert (errorcount);
13260 /* Throw away the broken statement tree and extra binding
13262 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13264 while (current_binding_level->kind != sk_function_parms)
13266 if (current_binding_level->kind == sk_class)
13267 pop_nested_class ();
13269 poplevel (0, 0, 0);
13272 poplevel (1, 0, 1);
13274 /* Statements should always be full-expressions at the outermost set
13275 of curly braces for a function. */
13276 gcc_assert (stmts_are_full_exprs_p ());
13278 /* Save constexpr function body before it gets munged by
13279 the NRV transformation. */
13280 maybe_save_function_definition (fndecl);
13282 /* Set up the named return value optimization, if we can. Candidate
13283 variables are selected in check_return_expr. */
13284 if (current_function_return_value)
13286 tree r = current_function_return_value;
13289 if (r != error_mark_node
13290 /* This is only worth doing for fns that return in memory--and
13291 simpler, since we don't have to worry about promoted modes. */
13292 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13293 /* Only allow this for variables declared in the outer scope of
13294 the function so we know that their lifetime always ends with a
13295 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13296 we were to do this optimization in tree-ssa. */
13297 && (outer = outer_curly_brace_block (fndecl))
13298 && chain_member (r, BLOCK_VARS (outer)))
13299 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13301 current_function_return_value = NULL_TREE;
13304 /* Remember that we were in class scope. */
13305 if (current_class_name)
13306 ctype = current_class_type;
13308 /* Must mark the RESULT_DECL as being in this function. */
13309 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13311 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13312 to the FUNCTION_DECL node itself. */
13313 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13315 /* Save away current state, if appropriate. */
13316 if (!processing_template_decl)
13317 save_function_data (fndecl);
13319 /* Complain if there's just no return statement. */
13320 if (warn_return_type
13321 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13322 && !dependent_type_p (TREE_TYPE (fntype))
13323 && !current_function_returns_value && !current_function_returns_null
13324 /* Don't complain if we abort or throw. */
13325 && !current_function_returns_abnormally
13326 /* Don't complain if we are declared noreturn. */
13327 && !TREE_THIS_VOLATILE (fndecl)
13328 && !DECL_NAME (DECL_RESULT (fndecl))
13329 && !TREE_NO_WARNING (fndecl)
13330 /* Structor return values (if any) are set by the compiler. */
13331 && !DECL_CONSTRUCTOR_P (fndecl)
13332 && !DECL_DESTRUCTOR_P (fndecl))
13334 warning (OPT_Wreturn_type,
13335 "no return statement in function returning non-void");
13336 TREE_NO_WARNING (fndecl) = 1;
13339 /* Store the end of the function, so that we get good line number
13340 info for the epilogue. */
13341 cfun->function_end_locus = input_location;
13343 /* Complain about parameters that are only set, but never otherwise used. */
13344 if (warn_unused_but_set_parameter
13345 && !processing_template_decl
13346 && errorcount == unused_but_set_errorcount
13347 && !DECL_CLONED_FUNCTION_P (fndecl))
13351 for (decl = DECL_ARGUMENTS (fndecl);
13353 decl = DECL_CHAIN (decl))
13354 if (TREE_USED (decl)
13355 && TREE_CODE (decl) == PARM_DECL
13356 && !DECL_READ_P (decl)
13357 && DECL_NAME (decl)
13358 && !DECL_ARTIFICIAL (decl)
13359 && !TREE_NO_WARNING (decl)
13360 && !DECL_IN_SYSTEM_HEADER (decl)
13361 && TREE_TYPE (decl) != error_mark_node
13362 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13363 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13364 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13365 warning (OPT_Wunused_but_set_parameter,
13366 "parameter %q+D set but not used", decl);
13367 unused_but_set_errorcount = errorcount;
13370 /* Genericize before inlining. */
13371 if (!processing_template_decl)
13373 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13374 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13375 cp_genericize (fndecl);
13376 /* Clear out the bits we don't need. */
13377 f->x_current_class_ptr = NULL;
13378 f->x_current_class_ref = NULL;
13379 f->x_eh_spec_block = NULL;
13380 f->x_in_charge_parm = NULL;
13381 f->x_vtt_parm = NULL;
13382 f->x_return_value = NULL;
13383 f->bindings = NULL;
13384 f->extern_decl_map = NULL;
13386 /* Clear out the bits we don't need. */
13387 local_names = NULL;
13389 /* We're leaving the context of this function, so zap cfun. It's still in
13390 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13392 current_function_decl = NULL;
13394 /* If this is an in-class inline definition, we may have to pop the
13395 bindings for the template parameters that we added in
13396 maybe_begin_member_template_processing when start_function was
13398 if (inclass_inline)
13399 maybe_end_member_template_processing ();
13401 /* Leave the scope of the class. */
13403 pop_nested_class ();
13408 current_function_decl = NULL_TREE;
13410 defer_mark_used_calls = false;
13411 if (deferred_mark_used_calls)
13416 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13418 VEC_free (tree, gc, deferred_mark_used_calls);
13424 /* Create the FUNCTION_DECL for a function definition.
13425 DECLSPECS and DECLARATOR are the parts of the declaration;
13426 they describe the return type and the name of the function,
13427 but twisted together in a fashion that parallels the syntax of C.
13429 This function creates a binding context for the function body
13430 as well as setting up the FUNCTION_DECL in current_function_decl.
13432 Returns a FUNCTION_DECL on success.
13434 If the DECLARATOR is not suitable for a function (it defines a datum
13435 instead), we return 0, which tells yyparse to report a parse error.
13437 May return void_type_node indicating that this method is actually
13438 a friend. See grokfield for more details.
13440 Came here with a `.pushlevel' .
13442 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13443 CHANGES TO CODE IN `grokfield'. */
13446 grokmethod (cp_decl_specifier_seq *declspecs,
13447 const cp_declarator *declarator, tree attrlist)
13449 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13452 if (fndecl == error_mark_node)
13453 return error_mark_node;
13455 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13457 error ("invalid member function declaration");
13458 return error_mark_node;
13462 cplus_decl_attributes (&fndecl, attrlist, 0);
13464 /* Pass friends other than inline friend functions back. */
13465 if (fndecl == void_type_node)
13468 if (DECL_IN_AGGR_P (fndecl))
13470 if (DECL_CLASS_SCOPE_P (fndecl))
13471 error ("%qD is already defined in class %qT", fndecl,
13472 DECL_CONTEXT (fndecl));
13473 return error_mark_node;
13476 check_template_shadow (fndecl);
13478 DECL_DECLARED_INLINE_P (fndecl) = 1;
13479 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13481 /* We process method specializations in finish_struct_1. */
13482 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13484 fndecl = push_template_decl (fndecl);
13485 if (fndecl == error_mark_node)
13489 if (! DECL_FRIEND_P (fndecl))
13491 if (DECL_CHAIN (fndecl))
13493 fndecl = copy_node (fndecl);
13494 TREE_CHAIN (fndecl) = NULL_TREE;
13498 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13500 DECL_IN_AGGR_P (fndecl) = 1;
13505 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13506 we can lay it out later, when and if its type becomes complete. */
13509 maybe_register_incomplete_var (tree var)
13511 gcc_assert (TREE_CODE (var) == VAR_DECL);
13513 /* Keep track of variables with incomplete types. */
13514 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13515 && DECL_EXTERNAL (var))
13517 tree inner_type = TREE_TYPE (var);
13519 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13520 inner_type = TREE_TYPE (inner_type);
13521 inner_type = TYPE_MAIN_VARIANT (inner_type);
13523 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13524 /* RTTI TD entries are created while defining the type_info. */
13525 || (TYPE_LANG_SPECIFIC (inner_type)
13526 && TYPE_BEING_DEFINED (inner_type)))
13529 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13531 iv->incomplete_type = inner_type;
13536 /* Called when a class type (given by TYPE) is defined. If there are
13537 any existing VAR_DECLs whose type has been completed by this
13538 declaration, update them now. */
13541 complete_vars (tree type)
13544 incomplete_var *iv;
13546 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13548 if (same_type_p (type, iv->incomplete_type))
13550 tree var = iv->decl;
13551 tree type = TREE_TYPE (var);
13552 /* Complete the type of the variable. The VAR_DECL itself
13553 will be laid out in expand_expr. */
13554 complete_type (type);
13555 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13556 /* Remove this entry from the list. */
13557 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13563 /* Check for pending declarations which may have abstract type. */
13564 complete_type_check_abstract (type);
13567 /* If DECL is of a type which needs a cleanup, build and return an
13568 expression to perform that cleanup here. Return NULL_TREE if no
13569 cleanup need be done. */
13572 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13578 /* Assume no cleanup is required. */
13579 cleanup = NULL_TREE;
13581 if (error_operand_p (decl))
13584 /* Handle "__attribute__((cleanup))". We run the cleanup function
13585 before the destructor since the destructor is what actually
13586 terminates the lifetime of the object. */
13587 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13594 /* Get the name specified by the user for the cleanup function. */
13595 id = TREE_VALUE (TREE_VALUE (attr));
13596 /* Look up the name to find the cleanup function to call. It is
13597 important to use lookup_name here because that is what is
13598 used in c-common.c:handle_cleanup_attribute when performing
13599 initial checks on the attribute. Note that those checks
13600 include ensuring that the function found is not an overloaded
13601 function, or an object with an overloaded call operator,
13602 etc.; we can rely on the fact that the function found is an
13603 ordinary FUNCTION_DECL. */
13604 fn = lookup_name (id);
13605 arg = build_address (decl);
13607 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13608 if (cleanup == error_mark_node)
13609 return error_mark_node;
13611 /* Handle ordinary C++ destructors. */
13612 type = TREE_TYPE (decl);
13613 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13615 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13616 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13617 && CLASSTYPE_VBASECLASSES (type));
13621 if (TREE_CODE (type) == ARRAY_TYPE)
13624 addr = build_address (decl);
13626 /* Optimize for space over speed here. */
13627 if (!has_vbases || flag_expensive_optimizations)
13628 flags |= LOOKUP_NONVIRTUAL;
13630 call = build_delete (TREE_TYPE (addr), addr,
13631 sfk_complete_destructor, flags, 0, complain);
13632 if (call == error_mark_node)
13633 cleanup = error_mark_node;
13635 cleanup = cp_build_compound_expr (cleanup, call, complain);
13643 /* When a stmt has been parsed, this function is called. */
13650 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13651 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13652 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13655 static_fn_type (tree memfntype)
13660 if (TYPE_PTRMEMFUNC_P (memfntype))
13661 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13662 if (POINTER_TYPE_P (memfntype)
13663 || TREE_CODE (memfntype) == FUNCTION_DECL)
13664 memfntype = TREE_TYPE (memfntype);
13665 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13667 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13668 args = TYPE_ARG_TYPES (memfntype);
13669 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13670 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13671 fntype = (cp_build_type_attribute_variant
13672 (fntype, TYPE_ATTRIBUTES (memfntype)));
13673 fntype = (build_exception_variant
13674 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13678 /* DECL was originally constructed as a non-static member function,
13679 but turned out to be static. Update it accordingly. */
13682 revert_static_member_fn (tree decl)
13684 tree stype = static_fn_type (decl);
13685 cp_cv_quals quals = type_memfn_quals (stype);
13687 if (quals != TYPE_UNQUALIFIED)
13688 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13690 TREE_TYPE (decl) = stype;
13692 if (DECL_ARGUMENTS (decl))
13693 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13694 DECL_STATIC_FUNCTION_P (decl) = 1;
13697 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13698 one of the language-independent trees. */
13700 enum cp_tree_node_structure_enum
13701 cp_tree_node_structure (union lang_tree_node * t)
13703 switch (TREE_CODE (&t->generic))
13705 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13706 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13707 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13708 case OVERLOAD: return TS_CP_OVERLOAD;
13709 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13710 case PTRMEM_CST: return TS_CP_PTRMEM;
13711 case BASELINK: return TS_CP_BASELINK;
13712 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13713 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13714 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13715 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13716 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13717 default: return TS_CP_GENERIC;
13721 /* Build the void_list_node (void_type_node having been created). */
13723 build_void_list_node (void)
13725 tree t = build_tree_list (NULL_TREE, void_type_node);
13730 cp_missing_noreturn_ok_p (tree decl)
13732 /* A missing noreturn is ok for the `main' function. */
13733 return DECL_MAIN_P (decl);
13736 /* Return the COMDAT group into which DECL should be placed. */
13739 cxx_comdat_group (tree decl)
13743 /* Virtual tables, construction virtual tables, and virtual table
13744 tables all go in a single COMDAT group, named after the primary
13746 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13747 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13748 /* For all other DECLs, the COMDAT group is the mangled name of the
13749 declaration itself. */
13752 while (DECL_THUNK_P (decl))
13754 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13755 into the same section as the target function. In that case
13756 we must return target's name. */
13757 tree target = THUNK_TARGET (decl);
13758 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13759 && DECL_SECTION_NAME (target) != NULL
13760 && DECL_ONE_ONLY (target))
13765 name = DECL_ASSEMBLER_NAME (decl);
13771 #include "gt-cp-decl.h"