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, Pmode);
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 (type == error_mark_node)
5391 /* We will have already complained. */
5394 if (TREE_CODE (type) == ARRAY_TYPE)
5396 if (check_array_initializer (decl, type, init))
5399 else if (!COMPLETE_TYPE_P (type))
5401 error ("%qD has incomplete type", decl);
5402 TREE_TYPE (decl) = error_mark_node;
5406 /* There is no way to make a variable-sized class type in GNU C++. */
5407 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5409 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5411 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5412 if (SCALAR_TYPE_P (type))
5416 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5417 init = build_zero_init (type, NULL_TREE, false);
5419 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5421 error ("scalar object %qD requires one element in initializer",
5423 TREE_TYPE (decl) = error_mark_node;
5429 if (TREE_CODE (decl) == CONST_DECL)
5431 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5433 DECL_INITIAL (decl) = init;
5435 gcc_assert (init != NULL_TREE);
5438 else if (!init && DECL_REALLY_EXTERN (decl))
5440 else if (TREE_CODE (type) == REFERENCE_TYPE)
5441 init = grok_reference_init (decl, type, init, cleanup);
5442 else if (init || type_build_ctor_call (type))
5445 check_for_uninitialized_const_var (decl);
5446 /* Do not reshape constructors of vectors (they don't need to be
5448 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5450 if (is_std_init_list (type))
5451 init = build_init_list_var_init (decl, type, init,
5452 &extra_init, cleanup);
5453 else if (TYPE_NON_AGGREGATE_CLASS (type))
5455 /* Don't reshape if the class has constructors. */
5456 if (cxx_dialect == cxx98)
5457 error ("in C++98 %qD must be initialized by constructor, "
5461 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5463 error ("opaque vector types cannot be initialized");
5464 init = error_mark_node;
5467 init = reshape_init (type, init, tf_warning_or_error);
5470 /* If DECL has an array type without a specific bound, deduce the
5471 array size from the initializer. */
5472 maybe_deduce_size_from_array_init (decl, init);
5473 type = TREE_TYPE (decl);
5474 if (type == error_mark_node)
5477 if (type_build_ctor_call (type)
5478 || (CLASS_TYPE_P (type)
5479 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5481 init_code = build_aggr_init_full_exprs (decl, init, flags);
5483 /* If this is a constexpr initializer, expand_default_init will
5484 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5485 case, pull the initializer back out and pass it down into
5486 store_init_value. */
5487 while (TREE_CODE (init_code) == EXPR_STMT
5488 || TREE_CODE (init_code) == CONVERT_EXPR)
5489 init_code = TREE_OPERAND (init_code, 0);
5490 if (TREE_CODE (init_code) == INIT_EXPR)
5492 init = TREE_OPERAND (init_code, 1);
5493 init_code = NULL_TREE;
5494 /* Don't call digest_init; it's unnecessary and will complain
5495 about aggregate initialization of non-aggregate classes. */
5496 flags |= LOOKUP_ALREADY_DIGESTED;
5498 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5500 /* Declared constexpr, but no suitable initializer; massage
5501 init appropriately so we can pass it into store_init_value
5503 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5504 init = finish_compound_literal (type, init,
5505 tf_warning_or_error);
5506 else if (CLASS_TYPE_P (type)
5507 && (!init || TREE_CODE (init) == TREE_LIST))
5509 init = build_functional_cast (type, init, tf_none);
5510 if (init != error_mark_node)
5511 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5513 init_code = NULL_TREE;
5519 if (init && TREE_CODE (init) != TREE_VEC)
5521 init_code = store_init_value (decl, init, flags);
5522 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5523 && DECL_INITIAL (decl)
5524 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5525 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5526 warning (0, "array %qD initialized by parenthesized string literal %qE",
5527 decl, DECL_INITIAL (decl));
5533 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5534 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5535 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5536 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5539 check_for_uninitialized_const_var (decl);
5542 if (init && init != error_mark_node)
5543 init_code = build2 (INIT_EXPR, type, decl, init);
5546 init_code = add_stmt_to_compound (extra_init, init_code);
5548 if (init_code && DECL_IN_AGGR_P (decl))
5550 static int explained = 0;
5552 if (cxx_dialect < cxx0x)
5553 error ("initializer invalid for static member with constructor");
5555 error ("non-constant in-class initialization invalid for static "
5556 "member %qD", decl);
5559 error ("(an out of class initialization is required)");
5567 /* If DECL is not a local variable, give it RTL. */
5570 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5572 int toplev = toplevel_bindings_p ();
5574 const char *filename;
5576 /* Set the DECL_ASSEMBLER_NAME for the object. */
5579 /* The `register' keyword, when used together with an
5580 asm-specification, indicates that the variable should be
5581 placed in a particular register. */
5582 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5584 set_user_assembler_name (decl, asmspec);
5585 DECL_HARD_REGISTER (decl) = 1;
5589 if (TREE_CODE (decl) == FUNCTION_DECL
5590 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5591 set_builtin_user_assembler_name (decl, asmspec);
5592 set_user_assembler_name (decl, asmspec);
5596 /* Handle non-variables up front. */
5597 if (TREE_CODE (decl) != VAR_DECL)
5599 rest_of_decl_compilation (decl, toplev, at_eof);
5603 /* If we see a class member here, it should be a static data
5605 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5607 gcc_assert (TREE_STATIC (decl));
5608 /* An in-class declaration of a static data member should be
5609 external; it is only a declaration, and not a definition. */
5610 if (init == NULL_TREE)
5611 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5614 /* We don't create any RTL for local variables. */
5615 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5618 /* We defer emission of local statics until the corresponding
5619 DECL_EXPR is expanded. */
5620 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5622 /* We try to defer namespace-scope static constants so that they are
5623 not emitted into the object file unnecessarily. */
5624 filename = input_filename;
5625 if (!DECL_VIRTUAL_P (decl)
5626 && TREE_READONLY (decl)
5627 && DECL_INITIAL (decl) != NULL_TREE
5628 && DECL_INITIAL (decl) != error_mark_node
5630 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5632 && !TREE_PUBLIC (decl))
5634 /* Fool with the linkage of static consts according to #pragma
5636 struct c_fileinfo *finfo = get_fileinfo (filename);
5637 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5639 TREE_PUBLIC (decl) = 1;
5640 DECL_EXTERNAL (decl) = finfo->interface_only;
5645 /* Likewise for template instantiations. */
5646 else if (DECL_LANG_SPECIFIC (decl)
5647 && DECL_IMPLICIT_INSTANTIATION (decl))
5650 /* If we're not deferring, go ahead and assemble the variable. */
5652 rest_of_decl_compilation (decl, toplev, at_eof);
5655 /* walk_tree helper for wrap_temporary_cleanups, below. */
5658 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5660 if (TYPE_P (*stmt_p))
5666 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5668 tree guard = (tree)data;
5669 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5671 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5672 /* Tell honor_protect_cleanup_actions to handle this as a separate
5674 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5676 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5682 /* We're initializing a local variable which has a cleanup GUARD. If there
5683 are any temporaries used in the initializer INIT of this variable, we
5684 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5685 variable will be cleaned up properly if one of them throws.
5687 Unfortunately, there's no way to express this properly in terms of
5688 nesting, as the regions for the temporaries overlap the region for the
5689 variable itself; if there are two temporaries, the variable needs to be
5690 the first thing destroyed if either of them throws. However, we only
5691 want to run the variable's cleanup if it actually got constructed. So
5692 we need to guard the temporary cleanups with the variable's cleanup if
5693 they are run on the normal path, but not if they are run on the
5694 exceptional path. We implement this by telling
5695 honor_protect_cleanup_actions to strip the variable cleanup from the
5696 exceptional path. */
5699 wrap_temporary_cleanups (tree init, tree guard)
5701 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5704 /* Generate code to initialize DECL (a local variable). */
5707 initialize_local_var (tree decl, tree init)
5709 tree type = TREE_TYPE (decl);
5713 gcc_assert (TREE_CODE (decl) == VAR_DECL
5714 || TREE_CODE (decl) == RESULT_DECL);
5715 gcc_assert (!TREE_STATIC (decl));
5717 if (DECL_SIZE (decl) == NULL_TREE)
5719 /* If we used it already as memory, it must stay in memory. */
5720 DECL_INITIAL (decl) = NULL_TREE;
5721 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5725 if (type == error_mark_node)
5728 /* Compute and store the initial value. */
5729 already_used = TREE_USED (decl) || TREE_USED (type);
5730 if (TREE_USED (type))
5731 DECL_READ_P (decl) = 1;
5733 /* Generate a cleanup, if necessary. */
5734 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5736 /* Perform the initialization. */
5739 if (TREE_CODE (init) == INIT_EXPR
5740 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5742 /* Stick simple initializers in DECL_INITIAL so that
5743 -Wno-init-self works (c++/34772). */
5744 gcc_assert (TREE_OPERAND (init, 0) == decl);
5745 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5749 int saved_stmts_are_full_exprs_p;
5751 /* If we're only initializing a single object, guard the
5752 destructors of any temporaries used in its initializer with
5753 its destructor. This isn't right for arrays because each
5754 element initialization is a full-expression. */
5755 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5756 wrap_temporary_cleanups (init, cleanup);
5758 gcc_assert (building_stmt_list_p ());
5759 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5760 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5761 finish_expr_stmt (init);
5762 current_stmt_tree ()->stmts_are_full_exprs_p =
5763 saved_stmts_are_full_exprs_p;
5767 /* Set this to 0 so we can tell whether an aggregate which was
5768 initialized was ever used. Don't do this if it has a
5769 destructor, so we don't complain about the 'resource
5770 allocation is initialization' idiom. Now set
5771 attribute((unused)) on types so decls of that type will be
5772 marked used. (see TREE_USED, above.) */
5773 if (TYPE_NEEDS_CONSTRUCTING (type)
5775 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5776 && DECL_NAME (decl))
5777 TREE_USED (decl) = 0;
5778 else if (already_used)
5779 TREE_USED (decl) = 1;
5782 finish_decl_cleanup (decl, cleanup);
5785 /* DECL is a VAR_DECL for a compiler-generated variable with static
5786 storage duration (like a virtual table) whose initializer is a
5787 compile-time constant. Initialize the variable and provide it to the
5791 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5794 gcc_assert (DECL_ARTIFICIAL (decl));
5795 init = build_constructor (TREE_TYPE (decl), v);
5796 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5797 DECL_INITIAL (decl) = init;
5798 DECL_INITIALIZED_P (decl) = 1;
5799 determine_visibility (decl);
5800 layout_var_decl (decl);
5801 maybe_commonize_var (decl);
5802 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5805 /* INIT is the initializer for a variable, as represented by the
5806 parser. Returns true iff INIT is type-dependent. */
5809 type_dependent_init_p (tree init)
5811 if (TREE_CODE (init) == TREE_LIST)
5812 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5813 return any_type_dependent_elements_p (init);
5814 else if (TREE_CODE (init) == CONSTRUCTOR)
5815 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5817 VEC(constructor_elt, gc) *elts;
5821 elts = CONSTRUCTOR_ELTS (init);
5822 nelts = VEC_length (constructor_elt, elts);
5823 for (i = 0; i < nelts; ++i)
5824 if (type_dependent_init_p (VEC_index (constructor_elt,
5829 /* It must be a simple expression, e.g., int i = 3; */
5830 return type_dependent_expression_p (init);
5835 /* INIT is the initializer for a variable, as represented by the
5836 parser. Returns true iff INIT is value-dependent. */
5839 value_dependent_init_p (tree init)
5841 if (TREE_CODE (init) == TREE_LIST)
5842 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5843 return any_value_dependent_elements_p (init);
5844 else if (TREE_CODE (init) == CONSTRUCTOR)
5845 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5847 VEC(constructor_elt, gc) *elts;
5851 elts = CONSTRUCTOR_ELTS (init);
5852 nelts = VEC_length (constructor_elt, elts);
5853 for (i = 0; i < nelts; ++i)
5854 if (value_dependent_init_p (VEC_index (constructor_elt,
5859 /* It must be a simple expression, e.g., int i = 3; */
5860 return value_dependent_expression_p (init);
5865 /* Finish processing of a declaration;
5866 install its line number and initial value.
5867 If the length of an array type is not known before,
5868 it must be determined now, from the initial value, or it is an error.
5870 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5871 true, then INIT is an integral constant expression.
5873 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5874 if the (init) syntax was used. */
5877 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5878 tree asmspec_tree, int flags)
5882 const char *asmspec = NULL;
5883 int was_readonly = 0;
5884 bool var_definition_p = false;
5887 if (decl == error_mark_node)
5892 error ("assignment (not initialization) in declaration");
5896 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5897 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5898 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5900 type = TREE_TYPE (decl);
5901 if (type == error_mark_node)
5904 /* Assume no cleanup is required. */
5905 cleanup = NULL_TREE;
5907 /* If a name was specified, get the string. */
5908 if (global_scope_p (current_binding_level))
5909 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5910 if (asmspec_tree && asmspec_tree != error_mark_node)
5911 asmspec = TREE_STRING_POINTER (asmspec_tree);
5913 if (current_class_type
5914 && CP_DECL_CONTEXT (decl) == current_class_type
5915 && TYPE_BEING_DEFINED (current_class_type)
5916 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5917 && (DECL_INITIAL (decl) || init))
5918 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5920 auto_node = type_uses_auto (type);
5924 if (init == NULL_TREE)
5926 error ("declaration of %q#D has no initializer", decl);
5927 TREE_TYPE (decl) = error_mark_node;
5931 if (TREE_CODE (d_init) == TREE_LIST)
5932 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5933 tf_warning_or_error);
5934 d_init = resolve_nondeduced_context (d_init);
5935 if (describable_type (d_init))
5937 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5939 if (type == error_mark_node)
5944 if (!ensure_literal_type_for_constexpr_object (decl))
5945 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5947 if (TREE_CODE (decl) == VAR_DECL
5948 && DECL_CLASS_SCOPE_P (decl)
5949 && DECL_INITIALIZED_IN_CLASS_P (decl))
5950 check_static_variable_definition (decl, type);
5952 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5955 if (init == ridpointers[(int)RID_DELETE])
5957 /* FIXME check this is 1st decl. */
5958 DECL_DELETED_FN (decl) = 1;
5959 DECL_DECLARED_INLINE_P (decl) = 1;
5960 DECL_INITIAL (decl) = error_mark_node;
5961 FOR_EACH_CLONE (clone, decl)
5963 DECL_DELETED_FN (clone) = 1;
5964 DECL_DECLARED_INLINE_P (clone) = 1;
5965 DECL_INITIAL (clone) = error_mark_node;
5969 else if (init == ridpointers[(int)RID_DEFAULT])
5971 if (defaultable_fn_check (decl))
5972 DECL_DEFAULTED_FN (decl) = 1;
5974 DECL_INITIAL (decl) = NULL_TREE;
5978 if (init && TREE_CODE (decl) == VAR_DECL)
5980 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5981 if (init_const_expr_p)
5983 /* Set these flags now for templates. We'll update the flags in
5984 store_init_value for instantiations. */
5985 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5986 if (decl_maybe_constant_var_p (decl))
5987 TREE_CONSTANT (decl) = 1;
5991 if (processing_template_decl)
5993 bool type_dependent_p;
5995 /* Add this declaration to the statement-tree. */
5996 if (at_function_scope_p ())
5997 add_decl_expr (decl);
5999 type_dependent_p = dependent_type_p (type);
6001 if (check_for_bare_parameter_packs (init))
6004 DECL_INITIAL (decl) = NULL_TREE;
6007 /* Generally, initializers in templates are expanded when the
6008 template is instantiated. But, if DECL is a variable constant
6009 then it can be used in future constant expressions, so its value
6010 must be available. */
6012 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6013 /* We can't do anything if the decl has dependent type. */;
6015 && init_const_expr_p
6016 && !type_dependent_p
6017 && decl_maybe_constant_var_p (decl)
6018 && !type_dependent_init_p (init)
6019 && !value_dependent_init_p (init))
6021 /* This variable seems to be a non-dependent constant, so process
6022 its initializer. If check_initializer returns non-null the
6023 initialization wasn't constant after all. */
6024 tree init_code = check_initializer (decl, init, flags, &cleanup);
6025 if (init_code == NULL_TREE)
6028 else if (!DECL_PRETTY_FUNCTION_P (decl))
6029 /* Deduce array size even if the initializer is dependent. */
6030 maybe_deduce_size_from_array_init (decl, init);
6033 DECL_INITIAL (decl) = init;
6037 /* Take care of TYPE_DECLs up front. */
6038 if (TREE_CODE (decl) == TYPE_DECL)
6040 if (type != error_mark_node
6041 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6043 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6044 warning (0, "shadowing previous type declaration of %q#D", decl);
6045 set_identifier_type_value (DECL_NAME (decl), decl);
6048 /* If we have installed this as the canonical typedef for this
6049 type, and that type has not been defined yet, delay emitting
6050 the debug information for it, as we will emit it later. */
6051 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6052 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6053 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6055 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6060 /* A reference will be modified here, as it is initialized. */
6061 if (! DECL_EXTERNAL (decl)
6062 && TREE_READONLY (decl)
6063 && TREE_CODE (type) == REFERENCE_TYPE)
6066 TREE_READONLY (decl) = 0;
6069 if (TREE_CODE (decl) == VAR_DECL)
6071 /* Only variables with trivial initialization and destruction can
6072 have thread-local storage. */
6073 if (DECL_THREAD_LOCAL_P (decl)
6074 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6075 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6076 error ("%qD cannot be thread-local because it has non-trivial "
6077 "type %qT", decl, TREE_TYPE (decl));
6078 /* If this is a local variable that will need a mangled name,
6079 register it now. We must do this before processing the
6080 initializer for the variable, since the initialization might
6081 require a guard variable, and since the mangled name of the
6082 guard variable will depend on the mangled name of this
6084 if (DECL_FUNCTION_SCOPE_P (decl)
6085 && TREE_STATIC (decl)
6086 && !DECL_ARTIFICIAL (decl))
6088 push_local_name (decl);
6089 if (DECL_CONSTRUCTOR_P (current_function_decl)
6090 || DECL_DESTRUCTOR_P (current_function_decl))
6091 /* Normally local_decls is populated during GIMPLE lowering,
6092 but [cd]tors are never actually compiled directly. We need
6093 to put statics on the list so we can deal with the label
6094 address extension. */
6095 add_local_decl (cfun, decl);
6098 /* Convert the initializer to the type of DECL, if we have not
6099 already initialized DECL. */
6100 if (!DECL_INITIALIZED_P (decl)
6101 /* If !DECL_EXTERNAL then DECL is being defined. In the
6102 case of a static data member initialized inside the
6103 class-specifier, there can be an initializer even if DECL
6104 is *not* defined. */
6105 && (!DECL_EXTERNAL (decl) || init))
6107 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6110 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6111 /* Allow libjava/prims.cc define primitive classes. */
6112 if (init != NULL_TREE
6113 || jclass == NULL_TREE
6114 || TREE_CODE (jclass) != TYPE_DECL
6115 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6116 || !same_type_ignoring_top_level_qualifiers_p
6117 (type, TREE_TYPE (TREE_TYPE (jclass))))
6118 error ("Java object %qD not allocated with %<new%>", decl);
6121 init = check_initializer (decl, init, flags, &cleanup);
6122 /* Thread-local storage cannot be dynamically initialized. */
6123 if (DECL_THREAD_LOCAL_P (decl) && init)
6125 error ("%qD is thread-local and so cannot be dynamically "
6126 "initialized", decl);
6130 /* Check that the initializer for a static data member was a
6131 constant. Although we check in the parser that the
6132 initializer is an integral constant expression, we do not
6133 simplify division-by-zero at the point at which it
6134 occurs. Therefore, in:
6136 struct S { static const int i = 7 / 0; };
6138 we issue an error at this point. It would
6139 probably be better to forbid division by zero in
6140 integral constant expressions. */
6141 if (DECL_EXTERNAL (decl) && init)
6143 error ("%qD cannot be initialized by a non-constant expression"
6144 " when being declared", decl);
6145 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6153 The memory occupied by any object of static storage
6154 duration is zero-initialized at program startup before
6155 any other initialization takes place.
6157 We cannot create an appropriate initializer until after
6158 the type of DECL is finalized. If DECL_INITIAL is set,
6159 then the DECL is statically initialized, and any
6160 necessary zero-initialization has already been performed. */
6161 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6162 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6163 /*nelts=*/NULL_TREE,
6164 /*static_storage_p=*/true);
6165 /* Remember that the initialization for this variable has
6167 DECL_INITIALIZED_P (decl) = 1;
6168 /* This declaration is the definition of this variable,
6169 unless we are initializing a static data member within
6170 the class specifier. */
6171 if (!DECL_EXTERNAL (decl))
6172 var_definition_p = true;
6174 /* If the variable has an array type, lay out the type, even if
6175 there is no initializer. It is valid to index through the
6176 array, and we must get TYPE_ALIGN set correctly on the array
6178 else if (TREE_CODE (type) == ARRAY_TYPE)
6181 if (TREE_STATIC (decl)
6182 && !at_function_scope_p ()
6183 && current_function_decl == NULL)
6184 /* So decl is a global variable or a static member of a
6185 non local class. Record the types it uses
6186 so that we can decide later to emit debug info for them. */
6187 record_types_used_by_current_var_decl (decl);
6189 else if (TREE_CODE (decl) == FIELD_DECL
6190 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6191 error ("non-static data member %qD has Java class type", decl);
6193 /* Add this declaration to the statement-tree. This needs to happen
6194 after the call to check_initializer so that the DECL_EXPR for a
6195 reference temp is added before the DECL_EXPR for the reference itself. */
6196 if (DECL_FUNCTION_SCOPE_P (decl))
6197 add_decl_expr (decl);
6199 /* Let the middle end know about variables and functions -- but not
6200 static data members in uninstantiated class templates. */
6201 if (TREE_CODE (decl) == VAR_DECL
6202 || TREE_CODE (decl) == FUNCTION_DECL)
6204 if (TREE_CODE (decl) == VAR_DECL)
6206 layout_var_decl (decl);
6207 maybe_commonize_var (decl);
6210 /* This needs to happen after the linkage is set. */
6211 determine_visibility (decl);
6213 if (var_definition_p && TREE_STATIC (decl))
6215 /* If a TREE_READONLY variable needs initialization
6216 at runtime, it is no longer readonly and we need to
6217 avoid MEM_READONLY_P being set on RTL created for it. */
6220 if (TREE_READONLY (decl))
6221 TREE_READONLY (decl) = 0;
6224 else if (was_readonly)
6225 TREE_READONLY (decl) = 1;
6228 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6230 /* Check for abstractness of the type. Notice that there is no
6231 need to strip array types here since the check for those types
6232 is already done within create_array_type_for_decl. */
6233 if (TREE_CODE (type) == FUNCTION_TYPE
6234 || TREE_CODE (type) == METHOD_TYPE)
6235 abstract_virtuals_error (decl, TREE_TYPE (type));
6237 abstract_virtuals_error (decl, type);
6239 if (TREE_TYPE (decl) == error_mark_node)
6240 /* No initialization required. */
6242 else if (TREE_CODE (decl) == FUNCTION_DECL)
6246 if (init == ridpointers[(int)RID_DEFAULT])
6248 /* An out-of-class default definition is defined at
6249 the point where it is explicitly defaulted. */
6250 if (DECL_DELETED_FN (decl))
6251 maybe_explain_implicit_delete (decl);
6252 else if (DECL_INITIAL (decl) == error_mark_node)
6253 synthesize_method (decl);
6256 error ("function %q#D is initialized like a variable", decl);
6258 /* else no initialization required. */
6260 else if (DECL_EXTERNAL (decl)
6261 && ! (DECL_LANG_SPECIFIC (decl)
6262 && DECL_NOT_REALLY_EXTERN (decl)))
6265 DECL_INITIAL (decl) = init;
6267 /* A variable definition. */
6268 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6269 /* Initialize the local variable. */
6270 initialize_local_var (decl, init);
6272 /* If a variable is defined, and then a subsequent
6273 definition with external linkage is encountered, we will
6274 get here twice for the same variable. We want to avoid
6275 calling expand_static_init more than once. For variables
6276 that are not static data members, we can call
6277 expand_static_init only when we actually process the
6278 initializer. It is not legal to redeclare a static data
6279 member, so this issue does not arise in that case. */
6280 else if (var_definition_p && TREE_STATIC (decl))
6281 expand_static_init (decl, init);
6284 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6285 reference, insert it in the statement-tree now. */
6287 push_cleanup (decl, cleanup, false);
6290 TREE_READONLY (decl) = 1;
6293 /* Returns a declaration for a VAR_DECL as if:
6295 extern "C" TYPE NAME;
6297 had been seen. Used to create compiler-generated global
6301 declare_global_var (tree name, tree type)
6305 push_to_top_level ();
6306 decl = build_decl (input_location, VAR_DECL, name, type);
6307 TREE_PUBLIC (decl) = 1;
6308 DECL_EXTERNAL (decl) = 1;
6309 DECL_ARTIFICIAL (decl) = 1;
6310 /* If the user has explicitly declared this variable (perhaps
6311 because the code we are compiling is part of a low-level runtime
6312 library), then it is possible that our declaration will be merged
6313 with theirs by pushdecl. */
6314 decl = pushdecl (decl);
6315 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6316 pop_from_top_level ();
6321 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6322 if "__cxa_atexit" is not being used) corresponding to the function
6323 to be called when the program exits. */
6326 get_atexit_fn_ptr_type (void)
6330 if (!atexit_fn_ptr_type_node)
6333 if (flag_use_cxa_atexit
6334 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6335 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6336 arg_type = ptr_type_node;
6338 /* The parameter to "atexit" is "void (*)(void)". */
6339 arg_type = NULL_TREE;
6341 fn_type = build_function_type_list (void_type_node,
6342 arg_type, NULL_TREE);
6343 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6346 return atexit_fn_ptr_type_node;
6349 /* Returns a pointer to the `atexit' function. Note that if
6350 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6351 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6354 get_atexit_node (void)
6360 bool use_aeabi_atexit;
6365 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6367 /* The declaration for `__cxa_atexit' is:
6369 int __cxa_atexit (void (*)(void *), void *, void *)
6371 We build up the argument types and then the function type
6373 tree argtype0, argtype1, argtype2;
6375 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6376 /* First, build the pointer-to-function type for the first
6378 fn_ptr_type = get_atexit_fn_ptr_type ();
6379 /* Then, build the rest of the argument types. */
6380 argtype2 = ptr_type_node;
6381 if (use_aeabi_atexit)
6383 argtype1 = fn_ptr_type;
6384 argtype0 = ptr_type_node;
6388 argtype1 = ptr_type_node;
6389 argtype0 = fn_ptr_type;
6391 /* And the final __cxa_atexit type. */
6392 fn_type = build_function_type_list (integer_type_node,
6393 argtype0, argtype1, argtype2,
6395 fn_ptr_type = build_pointer_type (fn_type);
6396 if (use_aeabi_atexit)
6397 name = "__aeabi_atexit";
6399 name = "__cxa_atexit";
6403 /* The declaration for `atexit' is:
6405 int atexit (void (*)());
6407 We build up the argument types and then the function type
6409 fn_ptr_type = get_atexit_fn_ptr_type ();
6410 /* Build the final atexit type. */
6411 fn_type = build_function_type_list (integer_type_node,
6412 fn_ptr_type, NULL_TREE);
6416 /* Now, build the function declaration. */
6417 push_lang_context (lang_name_c);
6418 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6419 mark_used (atexit_fndecl);
6420 pop_lang_context ();
6421 atexit_node = decay_conversion (atexit_fndecl);
6426 /* Returns the __dso_handle VAR_DECL. */
6429 get_dso_handle_node (void)
6431 if (dso_handle_node)
6432 return dso_handle_node;
6434 /* Declare the variable. */
6435 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6438 return dso_handle_node;
6441 /* Begin a new function with internal linkage whose job will be simply
6442 to destroy some particular variable. */
6444 static GTY(()) int start_cleanup_cnt;
6447 start_cleanup_fn (void)
6452 bool use_cxa_atexit = flag_use_cxa_atexit
6453 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6455 push_to_top_level ();
6457 /* No need to mangle this. */
6458 push_lang_context (lang_name_c);
6460 /* Build the name of the function. */
6461 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6462 /* Build the function declaration. */
6463 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6464 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6465 /* It's a function with internal linkage, generated by the
6467 TREE_PUBLIC (fndecl) = 0;
6468 DECL_ARTIFICIAL (fndecl) = 1;
6469 /* Make the function `inline' so that it is only emitted if it is
6470 actually needed. It is unlikely that it will be inlined, since
6471 it is only called via a function pointer, but we avoid unnecessary
6472 emissions this way. */
6473 DECL_DECLARED_INLINE_P (fndecl) = 1;
6474 DECL_INTERFACE_KNOWN (fndecl) = 1;
6475 /* Build the parameter. */
6480 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6481 DECL_CONTEXT (parmdecl) = fndecl;
6482 TREE_USED (parmdecl) = 1;
6483 DECL_READ_P (parmdecl) = 1;
6484 DECL_ARGUMENTS (fndecl) = parmdecl;
6488 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6490 pop_lang_context ();
6492 return current_function_decl;
6495 /* Finish the cleanup function begun by start_cleanup_fn. */
6498 end_cleanup_fn (void)
6500 expand_or_defer_fn (finish_function (0));
6502 pop_from_top_level ();
6505 /* Generate code to handle the destruction of DECL, an object with
6506 static storage duration. */
6509 register_dtor_fn (tree decl)
6516 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6518 type = TREE_TYPE (decl);
6519 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6520 return void_zero_node;
6522 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6523 a class object, we can just pass the destructor to
6524 "__cxa_atexit"; we don't have to build a temporary function to do
6526 use_dtor = (flag_use_cxa_atexit
6527 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6528 && CLASS_TYPE_P (type));
6533 /* Find the destructor. */
6534 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6535 gcc_assert (idx >= 0);
6536 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6537 /* Make sure it is accessible. */
6538 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6542 /* Call build_cleanup before we enter the anonymous function so
6543 that any access checks will be done relative to the current
6544 scope, rather than the scope of the anonymous function. */
6545 build_cleanup (decl);
6547 /* Now start the function. */
6548 cleanup = start_cleanup_fn ();
6550 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6551 to the original function, rather than the anonymous one. That
6552 will make the back end think that nested functions are in use,
6553 which causes confusion. */
6554 push_deferring_access_checks (dk_no_check);
6555 fcall = build_cleanup (decl);
6556 pop_deferring_access_checks ();
6558 /* Create the body of the anonymous function. */
6559 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6560 finish_expr_stmt (fcall);
6561 finish_compound_stmt (compound_stmt);
6565 /* Call atexit with the cleanup function. */
6566 mark_used (cleanup);
6567 cleanup = build_address (cleanup);
6568 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6574 /* We must convert CLEANUP to the type that "__cxa_atexit"
6576 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6577 /* "__cxa_atexit" will pass the address of DECL to the
6578 cleanup function. */
6580 addr = build_address (decl);
6581 /* The declared type of the parameter to "__cxa_atexit" is
6582 "void *". For plain "T*", we could just let the
6583 machinery in cp_build_function_call convert it -- but if the
6584 type is "cv-qualified T *", then we need to convert it
6585 before passing it in, to avoid spurious errors. */
6586 addr = build_nop (ptr_type_node, addr);
6589 /* Since the cleanup functions we build ignore the address
6590 they're given, there's no reason to pass the actual address
6591 in, and, in general, it's cheaper to pass NULL than any
6593 addr = null_pointer_node;
6594 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6595 tf_warning_or_error);
6596 if (targetm.cxx.use_aeabi_atexit ())
6609 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6610 arg0, arg1, arg2, NULL_TREE);
6613 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6614 is its initializer. Generate code to handle the construction
6615 and destruction of DECL. */
6618 expand_static_init (tree decl, tree init)
6620 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6621 gcc_assert (TREE_STATIC (decl));
6623 /* Some variables require no dynamic initialization. */
6625 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6628 if (DECL_FUNCTION_SCOPE_P (decl))
6630 /* Emit code to perform this initialization but once. */
6631 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6632 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6633 tree guard, guard_addr;
6634 tree acquire_fn, release_fn, abort_fn;
6637 /* Emit code to perform this initialization but once. This code
6640 static <type> guard;
6641 if (!guard.first_byte) {
6642 if (__cxa_guard_acquire (&guard)) {
6645 // Do initialization.
6646 flag = true; __cxa_guard_release (&guard);
6647 // Register variable for destruction at end of program.
6649 if (!flag) __cxa_guard_abort (&guard);
6653 Note that the `flag' variable is only set to 1 *after* the
6654 initialization is complete. This ensures that an exception,
6655 thrown during the construction, will cause the variable to
6656 reinitialized when we pass through this code again, as per:
6660 If the initialization exits by throwing an exception, the
6661 initialization is not complete, so it will be tried again
6662 the next time control enters the declaration.
6664 This process should be thread-safe, too; multiple threads
6665 should not be able to initialize the variable more than
6668 /* Create the guard variable. */
6669 guard = get_guard (decl);
6671 /* This optimization isn't safe on targets with relaxed memory
6672 consistency. On such targets we force synchronization in
6673 __cxa_guard_acquire. */
6674 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6676 /* Begin the conditional initialization. */
6677 if_stmt = begin_if_stmt ();
6678 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6679 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6682 if (flag_threadsafe_statics)
6684 guard_addr = build_address (guard);
6686 acquire_fn = get_identifier ("__cxa_guard_acquire");
6687 release_fn = get_identifier ("__cxa_guard_release");
6688 abort_fn = get_identifier ("__cxa_guard_abort");
6689 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6691 tree vfntype = build_function_type_list (void_type_node,
6692 TREE_TYPE (guard_addr),
6694 acquire_fn = push_library_fn
6695 (acquire_fn, build_function_type_list (integer_type_node,
6696 TREE_TYPE (guard_addr),
6699 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6700 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6704 release_fn = identifier_global_value (release_fn);
6705 abort_fn = identifier_global_value (abort_fn);
6708 inner_if_stmt = begin_if_stmt ();
6709 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6712 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6713 begin = get_target_expr (boolean_false_node);
6714 flag = TARGET_EXPR_SLOT (begin);
6716 TARGET_EXPR_CLEANUP (begin)
6717 = build3 (COND_EXPR, void_type_node, flag,
6719 build_call_n (abort_fn, 1, guard_addr));
6720 CLEANUP_EH_ONLY (begin) = 1;
6722 /* Do the initialization itself. */
6723 init = add_stmt_to_compound (begin, init);
6724 init = add_stmt_to_compound
6725 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6726 init = add_stmt_to_compound
6727 (init, build_call_n (release_fn, 1, guard_addr));
6730 init = add_stmt_to_compound (init, set_guard (guard));
6732 /* Use atexit to register a function for destroying this static
6734 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6736 finish_expr_stmt (init);
6738 if (flag_threadsafe_statics)
6740 finish_compound_stmt (inner_then_clause);
6741 finish_then_clause (inner_if_stmt);
6742 finish_if_stmt (inner_if_stmt);
6745 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6747 finish_compound_stmt (then_clause);
6748 finish_then_clause (if_stmt);
6749 finish_if_stmt (if_stmt);
6753 static_aggregates = tree_cons (init, decl, static_aggregates);
6757 /* Make TYPE a complete type based on INITIAL_VALUE.
6758 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6759 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6760 3 if the initializer list is empty (in pedantic mode). */
6763 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6766 tree type, elt_type;
6770 unsigned HOST_WIDE_INT i;
6773 /* An array of character type can be initialized from a
6774 brace-enclosed string constant.
6776 FIXME: this code is duplicated from reshape_init. Probably
6777 we should just call reshape_init here? */
6778 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6779 && TREE_CODE (initial_value) == CONSTRUCTOR
6780 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6782 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6783 tree value = VEC_index (constructor_elt, v, 0)->value;
6785 if (TREE_CODE (value) == STRING_CST
6786 && VEC_length (constructor_elt, v) == 1)
6787 initial_value = value;
6790 /* If any of the elements are parameter packs, we can't actually
6791 complete this type now because the array size is dependent. */
6792 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6794 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6797 if (PACK_EXPANSION_P (value))
6803 failure = complete_array_type (ptype, initial_value, do_default);
6805 /* We can create the array before the element type is complete, which
6806 means that we didn't have these two bits set in the original type
6807 either. In completing the type, we are expected to propagate these
6808 bits. See also complete_type which does the same thing for arrays
6811 if (TYPE_DOMAIN (type))
6813 elt_type = TREE_TYPE (type);
6814 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6815 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6816 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6822 /* As above, but either give an error or reject zero-size arrays, depending
6826 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6827 bool do_default, tsubst_flags_t complain)
6830 bool sfinae = !(complain & tf_error);
6831 /* In SFINAE context we can't be lenient about zero-size arrays. */
6834 failure = cp_complete_array_type (ptype, initial_value, do_default);
6840 /* Not an error. */;
6841 else if (failure == 1)
6842 error ("initializer fails to determine size of %qT", *ptype);
6843 else if (failure == 2)
6846 error ("array size missing in %qT", *ptype);
6848 else if (failure == 3)
6849 error ("zero-size array %qT", *ptype);
6850 *ptype = error_mark_node;
6855 /* Return zero if something is declared to be a member of type
6856 CTYPE when in the context of CUR_TYPE. STRING is the error
6857 message to print in that case. Otherwise, quietly return 1. */
6860 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6862 if (ctype && ctype != cur_type)
6864 if (flags == DTOR_FLAG)
6865 error ("destructor for alien class %qT cannot be a member", ctype);
6867 error ("constructor for alien class %qT cannot be a member", ctype);
6873 /* Subroutine of `grokdeclarator'. */
6875 /* Generate errors possibly applicable for a given set of specifiers.
6876 This is for ARM $7.1.2. */
6879 bad_specifiers (tree object,
6880 enum bad_spec_place type,
6891 error ("%qD declared as a %<virtual%> variable", object);
6893 error ("%qD declared as an %<inline%> variable", object);
6895 error ("%<const%> and %<volatile%> function specifiers on "
6896 "%qD invalid in variable declaration", object);
6900 error ("%qD declared as a %<virtual%> parameter", object);
6902 error ("%qD declared as an %<inline%> parameter", object);
6904 error ("%<const%> and %<volatile%> function specifiers on "
6905 "%qD invalid in parameter declaration", object);
6909 error ("%qD declared as a %<virtual%> type", object);
6911 error ("%qD declared as an %<inline%> type", object);
6913 error ("%<const%> and %<volatile%> function specifiers on "
6914 "%qD invalid in type declaration", object);
6918 error ("%qD declared as a %<virtual%> field", object);
6920 error ("%qD declared as an %<inline%> field", object);
6922 error ("%<const%> and %<volatile%> function specifiers on "
6923 "%qD invalid in field declaration", object);
6929 error ("%q+D declared as a friend", object);
6931 && (TREE_CODE (object) == TYPE_DECL
6932 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6933 && !TYPE_REFFN_P (TREE_TYPE (object))
6934 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6935 error ("%q+D declared with an exception specification", object);
6938 /* DECL is a member function or static data member and is presently
6939 being defined. Check that the definition is taking place in a
6943 check_class_member_definition_namespace (tree decl)
6945 /* These checks only apply to member functions and static data
6947 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6948 || TREE_CODE (decl) == VAR_DECL);
6949 /* We check for problems with specializations in pt.c in
6950 check_specialization_namespace, where we can issue better
6952 if (processing_specialization)
6954 /* There are no restrictions on the placement of
6955 explicit instantiations. */
6956 if (processing_explicit_instantiation)
6960 A member function definition that appears outside of the
6961 class definition shall appear in a namespace scope enclosing
6962 the class definition.
6966 The definition for a static data member shall appear in a
6967 namespace scope enclosing the member's class definition. */
6968 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6969 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6970 decl, DECL_CONTEXT (decl));
6973 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6974 METHOD_TYPE for a non-static member function; QUALS are the
6975 cv-qualifiers that apply to the function. */
6978 build_this_parm (tree type, cp_cv_quals quals)
6983 cp_cv_quals this_quals;
6985 this_type = type_of_this_parm (type);
6986 /* The `this' parameter is implicitly `const'; it cannot be
6988 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6989 qual_type = cp_build_qualified_type (this_type, this_quals);
6990 parm = build_artificial_parm (this_identifier, qual_type);
6991 cp_apply_type_quals_to_decl (this_quals, parm);
6995 /* DECL is a static member function. Complain if it was declared
6996 with function-cv-quals. */
6999 check_static_quals (tree decl, cp_cv_quals quals)
7001 if (quals != TYPE_UNQUALIFIED)
7002 error ("static member function %q#D declared with type qualifiers",
7006 /* CTYPE is class type, or null if non-class.
7007 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7009 DECLARATOR is the function's name.
7010 PARMS is a chain of PARM_DECLs for the function.
7011 VIRTUALP is truthvalue of whether the function is virtual or not.
7012 FLAGS are to be passed through to `grokclassfn'.
7013 QUALS are qualifiers indicating whether the function is `const'
7015 RAISES is a list of exceptions that this function can raise.
7016 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7017 not look, and -1 if we should not call `grokclassfn' at all.
7019 SFK is the kind of special function (if any) for the new function.
7021 Returns `NULL_TREE' if something goes wrong, after issuing
7022 applicable error messages. */
7025 grokfndecl (tree ctype,
7029 tree orig_declarator,
7031 enum overload_flags flags,
7038 special_function_kind sfk,
7043 location_t location)
7046 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7050 type = build_exception_variant (type, raises);
7052 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7054 /* If we have an explicit location, use it, otherwise use whatever
7055 build_lang_decl used (probably input_location). */
7056 if (location != UNKNOWN_LOCATION)
7057 DECL_SOURCE_LOCATION (decl) = location;
7059 if (TREE_CODE (type) == METHOD_TYPE)
7062 parm = build_this_parm (type, quals);
7063 DECL_CHAIN (parm) = parms;
7066 DECL_ARGUMENTS (decl) = parms;
7067 for (t = parms; t; t = DECL_CHAIN (t))
7068 DECL_CONTEXT (t) = decl;
7069 /* Propagate volatile out from type to decl. */
7070 if (TYPE_VOLATILE (type))
7071 TREE_THIS_VOLATILE (decl) = 1;
7073 /* Setup decl according to sfk. */
7076 case sfk_constructor:
7077 case sfk_copy_constructor:
7078 case sfk_move_constructor:
7079 DECL_CONSTRUCTOR_P (decl) = 1;
7081 case sfk_destructor:
7082 DECL_DESTRUCTOR_P (decl) = 1;
7088 /* If pointers to member functions use the least significant bit to
7089 indicate whether a function is virtual, ensure a pointer
7090 to this function will have that bit clear. */
7091 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7092 && TREE_CODE (type) == METHOD_TYPE
7093 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7094 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7097 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7101 ("defining explicit specialization %qD in friend declaration",
7105 tree fns = TREE_OPERAND (orig_declarator, 0);
7106 tree args = TREE_OPERAND (orig_declarator, 1);
7108 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7110 /* Something like `template <class T> friend void f<T>()'. */
7111 error ("invalid use of template-id %qD in declaration "
7112 "of primary template",
7118 /* A friend declaration of the form friend void f<>(). Record
7119 the information in the TEMPLATE_ID_EXPR. */
7120 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7122 if (TREE_CODE (fns) == COMPONENT_REF)
7124 /* Due to bison parser ickiness, we will have already looked
7125 up an operator_name or PFUNCNAME within the current class
7126 (see template_id in parse.y). If the current class contains
7127 such a name, we'll get a COMPONENT_REF here. Undo that. */
7129 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7130 == current_class_type);
7131 fns = TREE_OPERAND (fns, 1);
7133 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7134 || TREE_CODE (fns) == OVERLOAD);
7135 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7137 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7138 if (TREE_PURPOSE (t)
7139 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7141 error ("default arguments are not allowed in declaration "
7142 "of friend template specialization %qD",
7149 error ("%<inline%> is not allowed in declaration of friend "
7150 "template specialization %qD",
7157 /* If this decl has namespace scope, set that up. */
7159 set_decl_namespace (decl, in_namespace, friendp);
7161 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7163 /* `main' and builtins have implicit 'C' linkage. */
7164 if ((MAIN_NAME_P (declarator)
7165 || (IDENTIFIER_LENGTH (declarator) > 10
7166 && IDENTIFIER_POINTER (declarator)[0] == '_'
7167 && IDENTIFIER_POINTER (declarator)[1] == '_'
7168 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7169 && current_lang_name == lang_name_cplusplus
7170 && ctype == NULL_TREE
7171 && DECL_FILE_SCOPE_P (decl))
7172 SET_DECL_LANGUAGE (decl, lang_c);
7174 /* Should probably propagate const out from type to decl I bet (mrs). */
7177 DECL_STATIC_FUNCTION_P (decl) = 1;
7178 DECL_CONTEXT (decl) = ctype;
7183 DECL_CONTEXT (decl) = ctype;
7185 check_class_member_definition_namespace (decl);
7188 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7190 if (processing_template_decl)
7191 error ("cannot declare %<::main%> to be a template");
7193 error ("cannot declare %<::main%> to be inline");
7195 error ("cannot declare %<::main%> to be static");
7200 /* Members of anonymous types and local classes have no linkage; make
7201 them internal. If a typedef is made later, this will be changed. */
7202 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7203 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7206 if (publicp && cxx_dialect == cxx98)
7208 /* [basic.link]: A name with no linkage (notably, the name of a class
7209 or enumeration declared in a local scope) shall not be used to
7210 declare an entity with linkage.
7212 DR 757 relaxes this restriction for C++0x. */
7213 t = no_linkage_check (TREE_TYPE (decl),
7214 /*relaxed_p=*/false);
7217 if (TYPE_ANONYMOUS_P (t))
7219 if (DECL_EXTERN_C_P (decl))
7220 /* Allow this; it's pretty common in C. */;
7223 permerror (input_location, "anonymous type with no linkage "
7224 "used to declare function %q#D with linkage",
7226 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7227 permerror (input_location, "%q+#D does not refer to the unqualified "
7228 "type, so it is not used for linkage",
7233 permerror (input_location, "type %qT with no linkage used to "
7234 "declare function %q#D with linkage", t, decl);
7238 TREE_PUBLIC (decl) = publicp;
7241 DECL_INTERFACE_KNOWN (decl) = 1;
7242 DECL_NOT_REALLY_EXTERN (decl) = 1;
7245 /* If the declaration was declared inline, mark it as such. */
7247 DECL_DECLARED_INLINE_P (decl) = 1;
7249 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7251 DECL_EXTERNAL (decl) = 1;
7252 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7255 ? G_("static member function %qD cannot have cv-qualifier")
7256 : G_("non-member function %qD cannot have cv-qualifier"),
7258 quals = TYPE_UNQUALIFIED;
7261 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7262 && !grok_op_properties (decl, /*complain=*/true))
7266 /* Make the init_value nonzero so pushdecl knows this is not
7267 tentative. error_mark_node is replaced later with the BLOCK. */
7268 DECL_INITIAL (decl) = error_mark_node;
7270 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7271 TREE_NOTHROW (decl) = 1;
7273 /* Caller will do the rest of this. */
7277 if (ctype != NULL_TREE)
7278 grokclassfn (ctype, decl, flags);
7280 decl = check_explicit_specialization (orig_declarator, decl,
7283 4 * (friendp != 0));
7284 if (decl == error_mark_node)
7287 if (DECL_STATIC_FUNCTION_P (decl))
7288 check_static_quals (decl, quals);
7292 cplus_decl_attributes (&decl, *attrlist, 0);
7293 *attrlist = NULL_TREE;
7296 /* Check main's type after attributes have been applied. */
7297 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7299 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7302 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7304 error ("%<::main%> must return %<int%>");
7305 newtype = build_function_type (integer_type_node, oldtypeargs);
7306 TREE_TYPE (decl) = newtype;
7309 check_main_parameter_types (decl);
7312 if (ctype != NULL_TREE
7313 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7316 tree old_decl = check_classfn (ctype, decl,
7317 (processing_template_decl
7318 > template_class_depth (ctype))
7319 ? current_template_parms
7322 if (old_decl == error_mark_node)
7330 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7331 /* Because grokfndecl is always supposed to return a
7332 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7333 here. We depend on our callers to figure out that its
7334 really a template that's being returned. */
7335 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7337 if (DECL_STATIC_FUNCTION_P (old_decl)
7338 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7340 /* Remove the `this' parm added by grokclassfn. */
7341 revert_static_member_fn (decl);
7342 check_static_quals (decl, quals);
7344 if (DECL_ARTIFICIAL (old_decl))
7346 error ("definition of implicitly-declared %qD", old_decl);
7350 /* Since we've smashed OLD_DECL to its
7351 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7352 if (TREE_CODE (decl) == TEMPLATE_DECL)
7353 decl = DECL_TEMPLATE_RESULT (decl);
7355 /* Attempt to merge the declarations. This can fail, in
7356 the case of some invalid specialization declarations. */
7357 pushed_scope = push_scope (ctype);
7358 ok = duplicate_decls (decl, old_decl, friendp);
7360 pop_scope (pushed_scope);
7363 error ("no %q#D member function declared in class %qT",
7371 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7374 if (ctype == NULL_TREE || check)
7378 DECL_VIRTUAL_P (decl) = 1;
7383 /* decl is a FUNCTION_DECL.
7384 specifiers are the parsed virt-specifiers.
7386 Set flags to reflect the virt-specifiers.
7391 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7393 if (decl == NULL_TREE)
7395 if (specifiers & VIRT_SPEC_OVERRIDE)
7396 DECL_OVERRIDE_P (decl) = 1;
7397 if (specifiers & VIRT_SPEC_FINAL)
7398 DECL_FINAL_P (decl) = 1;
7402 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7403 the linkage that DECL will receive in the object file. */
7406 set_linkage_for_static_data_member (tree decl)
7408 /* A static data member always has static storage duration and
7409 external linkage. Note that static data members are forbidden in
7410 local classes -- the only situation in which a class has
7411 non-external linkage. */
7412 TREE_PUBLIC (decl) = 1;
7413 TREE_STATIC (decl) = 1;
7414 /* For non-template classes, static data members are always put
7415 out in exactly those files where they are defined, just as
7416 with ordinary namespace-scope variables. */
7417 if (!processing_template_decl)
7418 DECL_INTERFACE_KNOWN (decl) = 1;
7421 /* Create a VAR_DECL named NAME with the indicated TYPE.
7423 If SCOPE is non-NULL, it is the class type or namespace containing
7424 the variable. If SCOPE is NULL, the variable should is created in
7425 the innermost enclosings scope. */
7428 grokvardecl (tree type,
7430 const cp_decl_specifier_seq *declspecs,
7436 tree explicit_scope;
7438 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7440 /* Compute the scope in which to place the variable, but remember
7441 whether or not that scope was explicitly specified by the user. */
7442 explicit_scope = scope;
7445 /* An explicit "extern" specifier indicates a namespace-scope
7447 if (declspecs->storage_class == sc_extern)
7448 scope = current_decl_namespace ();
7449 else if (!at_function_scope_p ())
7450 scope = current_scope ();
7454 && (/* If the variable is a namespace-scope variable declared in a
7455 template, we need DECL_LANG_SPECIFIC. */
7456 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7457 /* Similarly for namespace-scope variables with language linkage
7459 || (TREE_CODE (scope) == NAMESPACE_DECL
7460 && current_lang_name != lang_name_cplusplus)
7461 /* Similarly for static data members. */
7463 decl = build_lang_decl (VAR_DECL, name, type);
7465 decl = build_decl (input_location, VAR_DECL, name, type);
7467 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7468 set_decl_namespace (decl, explicit_scope, 0);
7470 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7472 if (declspecs->storage_class == sc_extern)
7474 DECL_THIS_EXTERN (decl) = 1;
7475 DECL_EXTERNAL (decl) = !initialized;
7478 if (DECL_CLASS_SCOPE_P (decl))
7480 set_linkage_for_static_data_member (decl);
7481 /* This function is only called with out-of-class definitions. */
7482 DECL_EXTERNAL (decl) = 0;
7483 check_class_member_definition_namespace (decl);
7485 /* At top level, either `static' or no s.c. makes a definition
7486 (perhaps tentative), and absence of `static' makes it public. */
7487 else if (toplevel_bindings_p ())
7489 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7490 && (DECL_THIS_EXTERN (decl) || ! constp));
7491 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7493 /* Not at top level, only `static' makes a static definition. */
7496 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7497 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7500 if (declspecs->specs[(int)ds_thread])
7501 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7503 /* If the type of the decl has no linkage, make sure that we'll
7504 notice that in mark_used. */
7505 if (cxx_dialect > cxx98
7506 && decl_linkage (decl) != lk_none
7507 && DECL_LANG_SPECIFIC (decl) == NULL
7508 && !DECL_EXTERN_C_P (decl)
7509 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7510 retrofit_lang_decl (decl);
7512 if (TREE_PUBLIC (decl))
7514 /* [basic.link]: A name with no linkage (notably, the name of a class
7515 or enumeration declared in a local scope) shall not be used to
7516 declare an entity with linkage.
7518 DR 757 relaxes this restriction for C++0x. */
7519 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7520 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7523 if (TYPE_ANONYMOUS_P (t))
7525 if (DECL_EXTERN_C_P (decl))
7526 /* Allow this; it's pretty common in C. */
7530 /* DRs 132, 319 and 389 seem to indicate types with
7531 no linkage can only be used to declare extern "C"
7532 entities. Since it's not always an error in the
7533 ISO C++ 90 Standard, we only issue a warning. */
7534 warning (0, "anonymous type with no linkage used to declare "
7535 "variable %q#D with linkage", decl);
7536 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7537 warning (0, "%q+#D does not refer to the unqualified "
7538 "type, so it is not used for linkage",
7543 warning (0, "type %qT with no linkage used to declare variable "
7544 "%q#D with linkage", t, decl);
7548 DECL_INTERFACE_KNOWN (decl) = 1;
7553 /* Create and return a canonical pointer to member function type, for
7554 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7557 build_ptrmemfunc_type (tree type)
7561 tree unqualified_variant = NULL_TREE;
7563 if (type == error_mark_node)
7566 /* If a canonical type already exists for this type, use it. We use
7567 this method instead of type_hash_canon, because it only does a
7568 simple equality check on the list of field members. */
7570 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7573 /* Make sure that we always have the unqualified pointer-to-member
7575 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7577 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7579 t = make_class_type (RECORD_TYPE);
7580 xref_basetypes (t, NULL_TREE);
7582 /* Let the front end know this is a pointer to member function... */
7583 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7584 /* ... and not really a class type. */
7585 SET_CLASS_TYPE_P (t, 0);
7587 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7590 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7592 DECL_CHAIN (field) = fields;
7595 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7597 /* Zap out the name so that the back end will give us the debugging
7598 information for this anonymous RECORD_TYPE. */
7599 TYPE_NAME (t) = NULL_TREE;
7601 /* If this is not the unqualified form of this pointer-to-member
7602 type, set the TYPE_MAIN_VARIANT for this type to be the
7603 unqualified type. Since they are actually RECORD_TYPEs that are
7604 not variants of each other, we must do this manually.
7605 As we just built a new type there is no need to do yet another copy. */
7606 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7608 int type_quals = cp_type_quals (type);
7609 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7610 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7611 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7612 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7613 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7614 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7615 TREE_TYPE (TYPE_BINFO (t)) = t;
7618 /* Cache this pointer-to-member type so that we can find it again
7620 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7622 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7623 SET_TYPE_STRUCTURAL_EQUALITY (t);
7624 else if (TYPE_CANONICAL (type) != type)
7625 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7630 /* Create and return a pointer to data member type. */
7633 build_ptrmem_type (tree class_type, tree member_type)
7635 if (TREE_CODE (member_type) == METHOD_TYPE)
7637 cp_cv_quals quals = type_memfn_quals (member_type);
7638 member_type = build_memfn_type (member_type, class_type, quals);
7639 return build_ptrmemfunc_type (build_pointer_type (member_type));
7643 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7644 return build_offset_type (class_type, member_type);
7648 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7649 Check to see that the definition is valid. Issue appropriate error
7650 messages. Return 1 if the definition is particularly bad, or 0
7654 check_static_variable_definition (tree decl, tree type)
7656 /* Can't check yet if we don't know the type. */
7657 if (dependent_type_p (type))
7659 /* If DECL is declared constexpr, we'll do the appropriate checks
7660 in check_initializer. */
7661 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7663 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7665 if (literal_type_p (type))
7666 error ("%<constexpr%> needed for in-class initialization of static "
7667 "data member %q#D of non-integral type", decl);
7669 error ("in-class initialization of static data member %q#D of "
7670 "non-literal type", decl);
7674 /* Motion 10 at San Diego: If a static const integral data member is
7675 initialized with an integral constant expression, the initializer
7676 may appear either in the declaration (within the class), or in
7677 the definition, but not both. If it appears in the class, the
7678 member is a member constant. The file-scope definition is always
7680 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7682 error ("invalid in-class initialization of static data member "
7683 "of non-integral type %qT",
7687 else if (!CP_TYPE_CONST_P (type))
7688 error ("ISO C++ forbids in-class initialization of non-const "
7689 "static member %qD",
7691 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7692 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7693 "%qD of non-integral type %qT", decl, type);
7698 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7699 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7700 expressions out into temporary variables so that walk_tree doesn't
7701 step into them (c++/15764). */
7704 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7706 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7707 tree expr = *expr_p;
7708 if (TREE_CODE (expr) == SAVE_EXPR)
7710 tree op = TREE_OPERAND (expr, 0);
7711 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7712 if (TREE_SIDE_EFFECTS (op))
7713 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7716 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7721 /* Entry point for the above. */
7724 stabilize_vla_size (tree size)
7726 struct pointer_set_t *pset = pointer_set_create ();
7727 /* Break out any function calls into temporary variables. */
7728 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7731 /* Given the SIZE (i.e., number of elements) in an array, compute an
7732 appropriate index type for the array. If non-NULL, NAME is the
7733 name of the thing being declared. */
7736 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7741 tree abi_1_itype = NULL_TREE;
7743 if (error_operand_p (size))
7744 return error_mark_node;
7746 type = TREE_TYPE (size);
7747 /* type_dependent_expression_p? */
7748 if (!dependent_type_p (type))
7750 mark_rvalue_use (size);
7752 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7753 && TREE_SIDE_EFFECTS (size))
7754 /* In C++98, we mark a non-constant array bound with a magic
7755 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7758 size = fold_non_dependent_expr (size);
7760 if (CLASS_TYPE_P (type)
7761 && CLASSTYPE_LITERAL_P (type))
7763 size = build_expr_type_conversion (WANT_INT, size, true);
7766 if (!(complain & tf_error))
7767 return error_mark_node;
7769 error ("size of array %qD has non-integral type %qT",
7772 error ("size of array has non-integral type %qT", type);
7773 size = integer_one_node;
7775 if (size == error_mark_node)
7776 return error_mark_node;
7777 type = TREE_TYPE (size);
7778 /* We didn't support this case in GCC 3.2, so don't bother
7779 trying to model it now in ABI v1. */
7780 abi_1_itype = error_mark_node;
7783 size = maybe_constant_value (size);
7784 if (!TREE_CONSTANT (size))
7788 if (error_operand_p (size))
7789 return error_mark_node;
7791 /* The array bound must be an integer type. */
7792 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7794 if (!(complain & tf_error))
7795 return error_mark_node;
7797 error ("size of array %qD has non-integral type %qT", name, type);
7799 error ("size of array has non-integral type %qT", type);
7800 size = integer_one_node;
7801 type = TREE_TYPE (size);
7805 /* A type is dependent if it is...an array type constructed from any
7806 dependent type or whose size is specified by a constant expression
7807 that is value-dependent. */
7808 /* We can only call value_dependent_expression_p on integral constant
7809 expressions; treat non-constant expressions as dependent, too. */
7810 if (processing_template_decl
7811 && (dependent_type_p (type)
7812 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7814 /* We cannot do any checking for a SIZE that isn't known to be
7815 constant. Just build the index type and mark that it requires
7816 structural equality checks. */
7817 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7818 size, integer_one_node));
7819 TYPE_DEPENDENT_P (itype) = 1;
7820 TYPE_DEPENDENT_P_VALID (itype) = 1;
7821 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7825 if (!abi_version_at_least (2) && processing_template_decl
7826 && abi_1_itype == NULL_TREE)
7827 /* For abi-1, we handled all instances in templates the same way,
7828 even when they were non-dependent. This affects the manglings
7829 produced. So, we do the normal checking for non-dependent
7830 sizes, but at the end we'll return the same type that abi-1
7831 would have, but with TYPE_CANONICAL set to the "right"
7832 value that the current ABI would provide. */
7833 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7834 osize, integer_one_node));
7836 /* Normally, the array-bound will be a constant. */
7837 if (TREE_CODE (size) == INTEGER_CST)
7839 /* Check to see if the array bound overflowed. Make that an
7840 error, no matter how generous we're being. */
7841 constant_expression_error (size);
7843 /* An array must have a positive number of elements. */
7844 if (INT_CST_LT (size, integer_zero_node))
7846 if (!(complain & tf_error))
7847 return error_mark_node;
7849 error ("size of array %qD is negative", name);
7851 error ("size of array is negative");
7852 size = integer_one_node;
7854 /* As an extension we allow zero-sized arrays. */
7855 else if (integer_zerop (size))
7857 if (!(complain & tf_error))
7858 /* We must fail if performing argument deduction (as
7859 indicated by the state of complain), so that
7860 another substitution can be found. */
7861 return error_mark_node;
7862 else if (in_system_header)
7863 /* Allow them in system headers because glibc uses them. */;
7865 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7867 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7870 else if (TREE_CONSTANT (size)
7871 /* We don't allow VLAs at non-function scopes, or during
7872 tentative template substitution. */
7873 || !at_function_scope_p () || !(complain & tf_error))
7875 if (!(complain & tf_error))
7876 return error_mark_node;
7877 /* `(int) &fn' is not a valid array bound. */
7879 error ("size of array %qD is not an integral constant-expression",
7882 error ("size of array is not an integral constant-expression");
7883 size = integer_one_node;
7885 else if (pedantic && warn_vla != 0)
7888 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7890 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7892 else if (warn_vla > 0)
7896 "variable length array %qD is used", name);
7899 "variable length array is used");
7902 if (processing_template_decl && !TREE_CONSTANT (size))
7903 /* A variable sized array. */
7904 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7907 HOST_WIDE_INT saved_processing_template_decl;
7909 /* Compute the index of the largest element in the array. It is
7910 one less than the number of elements in the array. We save
7911 and restore PROCESSING_TEMPLATE_DECL so that computations in
7912 cp_build_binary_op will be appropriately folded. */
7913 saved_processing_template_decl = processing_template_decl;
7914 processing_template_decl = 0;
7915 itype = cp_build_binary_op (input_location,
7917 cp_convert (ssizetype, size),
7918 cp_convert (ssizetype, integer_one_node),
7919 tf_warning_or_error);
7920 itype = fold (itype);
7921 processing_template_decl = saved_processing_template_decl;
7923 if (!TREE_CONSTANT (itype))
7924 /* A variable sized array. */
7925 itype = variable_size (itype);
7926 /* Make sure that there was no overflow when creating to a signed
7927 index type. (For example, on a 32-bit machine, an array with
7928 size 2^32 - 1 is too big.) */
7929 else if (TREE_CODE (itype) == INTEGER_CST
7930 && TREE_OVERFLOW (itype))
7932 if (!(complain & tf_error))
7933 return error_mark_node;
7934 error ("overflow in array dimension");
7935 TREE_OVERFLOW (itype) = 0;
7939 /* Create and return the appropriate index type. */
7940 if (abi_1_itype && abi_1_itype != error_mark_node)
7942 tree t = build_index_type (itype);
7943 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7944 itype = abi_1_itype;
7947 itype = build_index_type (itype);
7949 /* If the index type were dependent, we would have returned early, so
7950 remember that it isn't. */
7951 TYPE_DEPENDENT_P (itype) = 0;
7952 TYPE_DEPENDENT_P_VALID (itype) = 1;
7956 /* Returns the scope (if any) in which the entity declared by
7957 DECLARATOR will be located. If the entity was declared with an
7958 unqualified name, NULL_TREE is returned. */
7961 get_scope_of_declarator (const cp_declarator *declarator)
7963 while (declarator && declarator->kind != cdk_id)
7964 declarator = declarator->declarator;
7966 /* If the declarator-id is a SCOPE_REF, the scope in which the
7967 declaration occurs is the first operand. */
7969 && declarator->u.id.qualifying_scope)
7970 return declarator->u.id.qualifying_scope;
7972 /* Otherwise, the declarator is not a qualified name; the entity will
7973 be declared in the current scope. */
7977 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7978 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7982 create_array_type_for_decl (tree name, tree type, tree size)
7984 tree itype = NULL_TREE;
7986 /* If things have already gone awry, bail now. */
7987 if (type == error_mark_node || size == error_mark_node)
7988 return error_mark_node;
7990 /* 8.3.4/1: If the type of the identifier of D contains the auto
7991 type-specifier, the program is ill-formed. */
7992 if (pedantic && type_uses_auto (type))
7993 pedwarn (input_location, OPT_pedantic,
7994 "declaration of %qD as array of %<auto%>", name);
7996 /* If there are some types which cannot be array elements,
7997 issue an error-message and return. */
7998 switch (TREE_CODE (type))
8002 error ("declaration of %qD as array of void", name);
8004 error ("creating array of void");
8005 return error_mark_node;
8009 error ("declaration of %qD as array of functions", name);
8011 error ("creating array of functions");
8012 return error_mark_node;
8014 case REFERENCE_TYPE:
8016 error ("declaration of %qD as array of references", name);
8018 error ("creating array of references");
8019 return error_mark_node;
8023 error ("declaration of %qD as array of function members", name);
8025 error ("creating array of function members");
8026 return error_mark_node;
8034 The constant expressions that specify the bounds of the arrays
8035 can be omitted only for the first member of the sequence. */
8036 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8039 error ("declaration of %qD as multidimensional array must "
8040 "have bounds for all dimensions except the first",
8043 error ("multidimensional array must have bounds for all "
8044 "dimensions except the first");
8046 return error_mark_node;
8049 /* Figure out the index type for the array. */
8051 itype = compute_array_index_type (name, size, tf_warning_or_error);
8054 T is called the array element type; this type shall not be [...] an
8055 abstract class type. */
8056 abstract_virtuals_error (name, type);
8058 return build_cplus_array_type (type, itype);
8061 /* Check that it's OK to declare a function with the indicated TYPE.
8062 SFK indicates the kind of special function (if any) that this
8063 function is. OPTYPE is the type given in a conversion operator
8064 declaration, or the class type for a constructor/destructor.
8065 Returns the actual return type of the function; that
8066 may be different than TYPE if an error occurs, or for certain
8067 special functions. */
8070 check_special_function_return_type (special_function_kind sfk,
8076 case sfk_constructor:
8078 error ("return type specification for constructor invalid");
8080 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8081 type = build_pointer_type (optype);
8083 type = void_type_node;
8086 case sfk_destructor:
8088 error ("return type specification for destructor invalid");
8089 /* We can't use the proper return type here because we run into
8090 problems with ambiguous bases and covariant returns.
8091 Java classes are left unchanged because (void *) isn't a valid
8092 Java type, and we don't want to change the Java ABI. */
8093 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8094 type = build_pointer_type (void_type_node);
8096 type = void_type_node;
8099 case sfk_conversion:
8101 error ("return type specified for %<operator %T%>", optype);
8112 /* A variable or data member (whose unqualified name is IDENTIFIER)
8113 has been declared with the indicated TYPE. If the TYPE is not
8114 acceptable, issue an error message and return a type to use for
8115 error-recovery purposes. */
8118 check_var_type (tree identifier, tree type)
8120 if (VOID_TYPE_P (type))
8123 error ("unnamed variable or field declared void");
8124 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8126 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8127 error ("variable or field %qE declared void", identifier);
8130 error ("variable or field declared void");
8131 type = error_mark_node;
8137 /* Given declspecs and a declarator (abstract or otherwise), determine
8138 the name and type of the object declared and construct a DECL node
8141 DECLSPECS points to the representation of declaration-specifier
8142 sequence that precedes declarator.
8144 DECL_CONTEXT says which syntactic context this declaration is in:
8145 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8146 FUNCDEF for a function definition. Like NORMAL but a few different
8147 error messages in each case. Return value may be zero meaning
8148 this definition is too screwy to try to parse.
8149 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8150 handle member functions (which have FIELD context).
8151 Return value may be zero meaning this definition is too screwy to
8153 PARM for a parameter declaration (either within a function prototype
8154 or before a function body). Make a PARM_DECL, or return void_type_node.
8155 TPARM for a template parameter declaration.
8156 CATCHPARM for a parameter declaration before a catch clause.
8157 TYPENAME if for a typename (in a cast or sizeof).
8158 Don't make a DECL node; just return the ..._TYPE node.
8159 FIELD for a struct or union field; make a FIELD_DECL.
8160 BITFIELD for a field with specified width.
8162 INITIALIZED is as for start_decl.
8164 ATTRLIST is a pointer to the list of attributes, which may be NULL
8165 if there are none; *ATTRLIST may be modified if attributes from inside
8166 the declarator should be applied to the declaration.
8168 When this function is called, scoping variables (such as
8169 CURRENT_CLASS_TYPE) should reflect the scope in which the
8170 declaration occurs, not the scope in which the new declaration will
8171 be placed. For example, on:
8175 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8178 Returns a DECL (if a declarator is present), a TYPE (if there is no
8179 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8183 grokdeclarator (const cp_declarator *declarator,
8184 const cp_decl_specifier_seq *declspecs,
8185 enum decl_context decl_context,
8189 tree type = NULL_TREE;
8191 int explicit_int128 = 0;
8192 int virtualp, explicitp, friendp, inlinep, staticp;
8193 int explicit_int = 0;
8194 int explicit_char = 0;
8195 int defaulted_int = 0;
8196 tree dependent_name = NULL_TREE;
8198 tree typedef_decl = NULL_TREE;
8199 const char *name = NULL;
8200 tree typedef_type = NULL_TREE;
8201 /* True if this declarator is a function definition. */
8202 bool funcdef_flag = false;
8203 cp_declarator_kind innermost_code = cdk_error;
8206 /* See the code below that used this. */
8207 tree decl_attr = NULL_TREE;
8210 /* Keep track of what sort of function is being processed
8211 so that we can warn about default return values, or explicit
8212 return values which do not match prescribed defaults. */
8213 special_function_kind sfk = sfk_none;
8215 tree dname = NULL_TREE;
8216 tree ctor_return_type = NULL_TREE;
8217 enum overload_flags flags = NO_SPECIAL;
8218 /* cv-qualifiers that apply to the declarator, for a declaration of
8219 a member function. */
8220 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8221 /* virt-specifiers that apply to the declarator, for a declaration of
8222 a member function. */
8223 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8224 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8226 tree raises = NULL_TREE;
8227 int template_count = 0;
8228 tree returned_attrs = NULL_TREE;
8229 tree parms = NULL_TREE;
8230 const cp_declarator *id_declarator;
8231 /* The unqualified name of the declarator; either an
8232 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8233 tree unqualified_id;
8234 /* The class type, if any, in which this entity is located,
8235 or NULL_TREE if none. Note that this value may be different from
8236 the current class type; for example if an attempt is made to declare
8237 "A::f" inside "B", this value will be "A". */
8238 tree ctype = current_class_type;
8239 /* The NAMESPACE_DECL for the namespace in which this entity is
8240 located. If an unqualified name is used to declare the entity,
8241 this value will be NULL_TREE, even if the entity is located at
8243 tree in_namespace = NULL_TREE;
8244 cp_storage_class storage_class;
8245 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8246 bool type_was_error_mark_node = false;
8247 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8248 bool template_type_arg = false;
8249 bool template_parm_flag = false;
8250 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8253 signed_p = declspecs->specs[(int)ds_signed];
8254 unsigned_p = declspecs->specs[(int)ds_unsigned];
8255 short_p = declspecs->specs[(int)ds_short];
8256 long_p = declspecs->specs[(int)ds_long];
8257 longlong = declspecs->specs[(int)ds_long] >= 2;
8258 explicit_int128 = declspecs->explicit_int128_p;
8259 thread_p = declspecs->specs[(int)ds_thread];
8261 if (decl_context == FUNCDEF)
8262 funcdef_flag = true, decl_context = NORMAL;
8263 else if (decl_context == MEMFUNCDEF)
8264 funcdef_flag = true, decl_context = FIELD;
8265 else if (decl_context == BITFIELD)
8266 bitfield = 1, decl_context = FIELD;
8267 else if (decl_context == TEMPLATE_TYPE_ARG)
8268 template_type_arg = true, decl_context = TYPENAME;
8269 else if (decl_context == TPARM)
8270 template_parm_flag = true, decl_context = PARM;
8272 if (initialized > 1)
8273 funcdef_flag = true;
8275 /* Look inside a declarator for the name being declared
8276 and get it as a string, for an error message. */
8277 for (id_declarator = declarator;
8279 id_declarator = id_declarator->declarator)
8281 if (id_declarator->kind != cdk_id)
8282 innermost_code = id_declarator->kind;
8284 switch (id_declarator->kind)
8287 if (id_declarator->declarator
8288 && id_declarator->declarator->kind == cdk_id)
8290 sfk = id_declarator->declarator->u.id.sfk;
8291 if (sfk == sfk_destructor)
8298 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8299 tree decl = id_declarator->u.id.unqualified_name;
8302 if (qualifying_scope)
8304 if (at_function_scope_p ())
8308 A declarator-id shall not be qualified except
8311 None of the cases are permitted in block
8313 if (qualifying_scope == global_namespace)
8314 error ("invalid use of qualified-name %<::%D%>",
8316 else if (TYPE_P (qualifying_scope))
8317 error ("invalid use of qualified-name %<%T::%D%>",
8318 qualifying_scope, decl);
8320 error ("invalid use of qualified-name %<%D::%D%>",
8321 qualifying_scope, decl);
8322 return error_mark_node;
8324 else if (TYPE_P (qualifying_scope))
8326 ctype = qualifying_scope;
8327 if (innermost_code != cdk_function
8328 && current_class_type
8329 && !UNIQUELY_DERIVED_FROM_P (ctype,
8330 current_class_type))
8332 error ("type %qT is not derived from type %qT",
8333 ctype, current_class_type);
8334 return error_mark_node;
8337 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8338 in_namespace = qualifying_scope;
8340 switch (TREE_CODE (decl))
8346 if (innermost_code != cdk_function)
8348 error ("declaration of %qD as non-function", decl);
8349 return error_mark_node;
8351 else if (!qualifying_scope
8352 && !(current_class_type && at_class_scope_p ()))
8354 error ("declaration of %qD as non-member", decl);
8355 return error_mark_node;
8358 type = TREE_OPERAND (decl, 0);
8360 type = constructor_name (type);
8361 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8366 case TEMPLATE_ID_EXPR:
8368 tree fns = TREE_OPERAND (decl, 0);
8371 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8373 gcc_assert (is_overloaded_fn (dname));
8374 dname = DECL_NAME (get_first_fn (dname));
8379 case IDENTIFIER_NODE:
8380 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8383 if (C_IS_RESERVED_WORD (dname))
8385 error ("declarator-id missing; using reserved word %qD",
8387 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8389 else if (!IDENTIFIER_TYPENAME_P (dname))
8390 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8393 gcc_assert (flags == NO_SPECIAL);
8394 flags = TYPENAME_FLAG;
8395 ctor_return_type = TREE_TYPE (dname);
8396 sfk = sfk_conversion;
8397 if (is_typename_at_global_scope (dname))
8398 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8400 name = "<invalid operator>";
8417 return error_mark_node;
8422 if (id_declarator->kind == cdk_id)
8428 The declarator in a function-definition shall have the form
8429 D1 ( parameter-declaration-clause) ... */
8430 if (funcdef_flag && innermost_code != cdk_function)
8432 error ("function definition does not declare parameters");
8433 return error_mark_node;
8436 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8437 && innermost_code != cdk_function
8438 && ! (ctype && !declspecs->any_specifiers_p))
8440 error ("declaration of %qD as non-function", dname);
8441 return error_mark_node;
8444 /* Anything declared one level down from the top level
8445 must be one of the parameters of a function
8446 (because the body is at least two levels down). */
8448 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8449 by not allowing C++ class definitions to specify their parameters
8450 with xdecls (must be spec.d in the parmlist).
8452 Since we now wait to push a class scope until we are sure that
8453 we are in a legitimate method context, we must set oldcname
8454 explicitly (since current_class_name is not yet alive).
8456 We also want to avoid calling this a PARM if it is in a namespace. */
8458 if (decl_context == NORMAL && !toplevel_bindings_p ())
8460 struct cp_binding_level *b = current_binding_level;
8461 current_binding_level = b->level_chain;
8462 if (current_binding_level != 0 && toplevel_bindings_p ())
8463 decl_context = PARM;
8464 current_binding_level = b;
8468 name = decl_context == PARM ? "parameter" : "type name";
8470 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8472 error ("%<constexpr%> cannot appear in a typedef declaration");
8473 return error_mark_node;
8476 /* If there were multiple types specified in the decl-specifier-seq,
8477 issue an error message. */
8478 if (declspecs->multiple_types_p)
8480 error ("two or more data types in declaration of %qs", name);
8481 return error_mark_node;
8484 if (declspecs->conflicting_specifiers_p)
8486 error ("conflicting specifiers in declaration of %qs", name);
8487 return error_mark_node;
8490 /* Extract the basic type from the decl-specifier-seq. */
8491 type = declspecs->type;
8492 if (type == error_mark_node)
8495 type_was_error_mark_node = true;
8497 /* If the entire declaration is itself tagged as deprecated then
8498 suppress reports of deprecated items. */
8499 if (type && TREE_DEPRECATED (type)
8500 && deprecated_state != DEPRECATED_SUPPRESS)
8501 warn_deprecated_use (type, NULL_TREE);
8502 if (type && TREE_CODE (type) == TYPE_DECL)
8504 typedef_decl = type;
8505 type = TREE_TYPE (typedef_decl);
8506 if (TREE_DEPRECATED (type)
8507 && DECL_ARTIFICIAL (typedef_decl)
8508 && deprecated_state != DEPRECATED_SUPPRESS)
8509 warn_deprecated_use (type, NULL_TREE);
8511 /* No type at all: default to `int', and set DEFAULTED_INT
8512 because it was not a user-defined typedef. */
8513 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8515 /* These imply 'int'. */
8516 type = integer_type_node;
8520 explicit_int = declspecs->explicit_int_p;
8521 explicit_char = declspecs->explicit_char_p;
8524 /* See the code below that used this. */
8526 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8528 typedef_type = type;
8531 if (sfk != sfk_conversion)
8532 ctor_return_type = ctype;
8534 if (sfk != sfk_none)
8535 type = check_special_function_return_type (sfk, type,
8537 else if (type == NULL_TREE)
8543 /* We handle `main' specially here, because 'main () { }' is so
8544 common. With no options, it is allowed. With -Wreturn-type,
8545 it is a warning. It is only an error with -pedantic-errors. */
8546 is_main = (funcdef_flag
8547 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8548 && MAIN_NAME_P (dname)
8549 && ctype == NULL_TREE
8550 && in_namespace == NULL_TREE
8551 && current_namespace == global_namespace);
8553 if (type_was_error_mark_node)
8554 /* We've already issued an error, don't complain more. */;
8555 else if (in_system_header || flag_ms_extensions)
8556 /* Allow it, sigh. */;
8558 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8560 pedwarn (input_location, OPT_pedantic,
8561 "ISO C++ forbids declaration of %qs with no type", name);
8563 warning (OPT_Wreturn_type,
8564 "ISO C++ forbids declaration of %qs with no type", name);
8566 type = integer_type_node;
8571 /* Now process the modifiers that were specified
8572 and check for invalid combinations. */
8574 /* Long double is a special combination. */
8575 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8578 type = cp_build_qualified_type (long_double_type_node,
8579 cp_type_quals (type));
8582 /* Check all other uses of type modifiers. */
8584 if (unsigned_p || signed_p || long_p || short_p)
8588 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8589 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8590 else if (signed_p && unsigned_p)
8591 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8592 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8593 error ("%<long long%> invalid for %qs", name);
8594 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8595 error ("%<__int128%> invalid for %qs", name);
8596 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8597 error ("%<long%> invalid for %qs", name);
8598 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8599 error ("%<short%> invalid for %qs", name);
8600 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8601 error ("%<long%> or %<short%> invalid for %qs", name);
8602 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8603 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8604 else if ((long_p || short_p) && explicit_char)
8605 error ("%<long%> or %<short%> specified with char for %qs", name);
8606 else if (long_p && short_p)
8607 error ("%<long%> and %<short%> specified together for %qs", name);
8608 else if (type == char16_type_node || type == char32_type_node)
8610 if (signed_p || unsigned_p)
8611 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8612 else if (short_p || long_p)
8613 error ("%<short%> or %<long%> invalid for %qs", name);
8618 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8620 pedwarn (input_location, OPT_pedantic,
8621 "long, short, signed or unsigned used invalidly for %qs",
8623 if (flag_pedantic_errors)
8626 if (explicit_int128)
8628 if (int128_integer_type_node == NULL_TREE)
8630 error ("%<__int128%> is not supported by this target");
8635 pedwarn (input_location, OPT_pedantic,
8636 "ISO C++ does not support %<__int128%> for %qs",
8638 if (flag_pedantic_errors)
8644 /* Discard the type modifiers if they are invalid. */
8652 explicit_int128 = false;
8656 /* Decide whether an integer type is signed or not.
8657 Optionally treat bitfields as signed by default. */
8661 It is implementation-defined whether a plain (neither
8662 explicitly signed or unsigned) char, short, int, or long
8663 bit-field is signed or unsigned.
8665 Naturally, we extend this to long long as well. Note that
8666 this does not include wchar_t. */
8667 || (bitfield && !flag_signed_bitfields
8669 /* A typedef for plain `int' without `signed' can be
8670 controlled just like plain `int', but a typedef for
8671 `signed int' cannot be so controlled. */
8673 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8674 && TREE_CODE (type) == INTEGER_TYPE
8675 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8677 if (explicit_int128)
8678 type = int128_unsigned_type_node;
8680 type = long_long_unsigned_type_node;
8682 type = long_unsigned_type_node;
8684 type = short_unsigned_type_node;
8685 else if (type == char_type_node)
8686 type = unsigned_char_type_node;
8687 else if (typedef_decl)
8688 type = unsigned_type_for (type);
8690 type = unsigned_type_node;
8692 else if (signed_p && type == char_type_node)
8693 type = signed_char_type_node;
8694 else if (explicit_int128)
8695 type = int128_integer_type_node;
8697 type = long_long_integer_type_node;
8699 type = long_integer_type_node;
8701 type = short_integer_type_node;
8703 if (declspecs->specs[(int)ds_complex])
8705 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8706 error ("complex invalid for %qs", name);
8707 /* If we just have "complex", it is equivalent to
8708 "complex double", but if any modifiers at all are specified it is
8709 the complex form of TYPE. E.g, "complex short" is
8710 "complex short int". */
8711 else if (defaulted_int && ! longlong && ! explicit_int128
8712 && ! (long_p || short_p || signed_p || unsigned_p))
8713 type = complex_double_type_node;
8714 else if (type == integer_type_node)
8715 type = complex_integer_type_node;
8716 else if (type == float_type_node)
8717 type = complex_float_type_node;
8718 else if (type == double_type_node)
8719 type = complex_double_type_node;
8720 else if (type == long_double_type_node)
8721 type = complex_long_double_type_node;
8723 type = build_complex_type (type);
8726 type_quals = TYPE_UNQUALIFIED;
8727 if (declspecs->specs[(int)ds_const])
8728 type_quals |= TYPE_QUAL_CONST;
8729 if (declspecs->specs[(int)ds_volatile])
8730 type_quals |= TYPE_QUAL_VOLATILE;
8731 if (declspecs->specs[(int)ds_restrict])
8732 type_quals |= TYPE_QUAL_RESTRICT;
8733 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8734 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8737 type_quals |= cp_type_quals (type);
8738 type = cp_build_qualified_type_real
8739 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8740 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8741 /* We might have ignored or rejected some of the qualifiers. */
8742 type_quals = cp_type_quals (type);
8745 inlinep = !! declspecs->specs[(int)ds_inline];
8746 virtualp = !! declspecs->specs[(int)ds_virtual];
8747 explicitp = !! declspecs->specs[(int)ds_explicit];
8749 storage_class = declspecs->storage_class;
8750 if (storage_class == sc_static)
8751 staticp = 1 + (decl_context == FIELD);
8753 if (virtualp && staticp == 2)
8755 error ("member %qD cannot be declared both virtual and static", dname);
8756 storage_class = sc_none;
8759 friendp = !! declspecs->specs[(int)ds_friend];
8761 if (dependent_name && !friendp)
8763 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8764 return error_mark_node;
8767 /* Issue errors about use of storage classes for parameters. */
8768 if (decl_context == PARM)
8770 if (declspecs->specs[(int)ds_typedef])
8772 error ("typedef declaration invalid in parameter declaration");
8773 return error_mark_node;
8775 else if (template_parm_flag && storage_class != sc_none)
8777 error ("storage class specified for template parameter %qs", name);
8778 return error_mark_node;
8780 else if (storage_class == sc_static
8781 || storage_class == sc_extern
8783 error ("storage class specifiers invalid in parameter declarations");
8785 /* Function parameters cannot be constexpr. If we saw one, moan
8786 and pretend it wasn't there. */
8789 error ("a parameter cannot be declared %<constexpr%>");
8794 /* Give error if `virtual' is used outside of class declaration. */
8796 && (current_class_name == NULL_TREE || decl_context != FIELD))
8798 error ("%<virtual%> outside class declaration");
8802 /* Static anonymous unions are dealt with here. */
8803 if (staticp && decl_context == TYPENAME
8805 && ANON_AGGR_TYPE_P (declspecs->type))
8806 decl_context = FIELD;
8808 /* Warn about storage classes that are invalid for certain
8809 kinds of declarations (parameters, typenames, etc.). */
8812 && storage_class != sc_extern
8813 && storage_class != sc_static)
8814 || declspecs->specs[(int)ds_typedef]))
8816 error ("multiple storage classes in declaration of %qs", name);
8819 if (decl_context != NORMAL
8820 && ((storage_class != sc_none
8821 && storage_class != sc_mutable)
8824 if ((decl_context == PARM || decl_context == CATCHPARM)
8825 && (storage_class == sc_register
8826 || storage_class == sc_auto))
8828 else if (declspecs->specs[(int)ds_typedef])
8830 else if (decl_context == FIELD
8831 /* C++ allows static class elements. */
8832 && storage_class == sc_static)
8833 /* C++ also allows inlines and signed and unsigned elements,
8834 but in those cases we don't come in here. */
8838 if (decl_context == FIELD)
8839 error ("storage class specified for %qs", name);
8842 if (decl_context == PARM || decl_context == CATCHPARM)
8843 error ("storage class specified for parameter %qs", name);
8845 error ("storage class specified for typename");
8847 if (storage_class == sc_register
8848 || storage_class == sc_auto
8849 || storage_class == sc_extern
8851 storage_class = sc_none;
8854 else if (storage_class == sc_extern && funcdef_flag
8855 && ! toplevel_bindings_p ())
8856 error ("nested function %qs declared %<extern%>", name);
8857 else if (toplevel_bindings_p ())
8859 if (storage_class == sc_auto)
8860 error ("top-level declaration of %qs specifies %<auto%>", name);
8863 && storage_class != sc_extern
8864 && storage_class != sc_static)
8866 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8871 if (storage_class && friendp)
8873 error ("storage class specifiers invalid in friend function declarations");
8874 storage_class = sc_none;
8879 unqualified_id = NULL_TREE;
8882 unqualified_id = id_declarator->u.id.unqualified_name;
8883 switch (TREE_CODE (unqualified_id))
8886 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8887 if (TYPE_P (unqualified_id))
8888 unqualified_id = constructor_name (unqualified_id);
8891 case IDENTIFIER_NODE:
8892 case TEMPLATE_ID_EXPR:
8900 /* Determine the type of the entity declared by recurring on the
8902 for (; declarator; declarator = declarator->declarator)
8904 const cp_declarator *inner_declarator;
8907 if (type == error_mark_node)
8908 return error_mark_node;
8910 attrs = declarator->attributes;
8916 if (declarator == NULL || declarator->kind == cdk_id)
8917 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8918 if (declarator->kind == cdk_function)
8919 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8920 if (declarator->kind == cdk_array)
8921 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8922 returned_attrs = decl_attributes (&type,
8923 chainon (returned_attrs, attrs),
8927 if (declarator->kind == cdk_id)
8930 inner_declarator = declarator->declarator;
8932 switch (declarator->kind)
8935 type = create_array_type_for_decl (dname, type,
8936 declarator->u.array.bounds);
8944 /* Declaring a function type.
8945 Make sure we have a valid type for the function to return. */
8947 if (type_quals != TYPE_UNQUALIFIED)
8949 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8950 warning (OPT_Wignored_qualifiers,
8951 "type qualifiers ignored on function return type");
8952 /* We now know that the TYPE_QUALS don't apply to the
8953 decl, but to its return type. */
8954 type_quals = TYPE_UNQUALIFIED;
8956 errmsg = targetm.invalid_return_type (type);
8960 type = integer_type_node;
8963 /* Error about some types functions can't return. */
8965 if (TREE_CODE (type) == FUNCTION_TYPE)
8967 error ("%qs declared as function returning a function", name);
8968 return error_mark_node;
8970 if (TREE_CODE (type) == ARRAY_TYPE)
8972 error ("%qs declared as function returning an array", name);
8973 return error_mark_node;
8976 /* Pick up type qualifiers which should be applied to `this'. */
8977 memfn_quals = declarator->u.function.qualifiers;
8978 /* Pick up virt-specifiers. */
8979 virt_specifiers = declarator->u.function.virt_specifiers;
8980 /* Pick up the exception specifications. */
8981 raises = declarator->u.function.exception_specification;
8983 /* Say it's a definition only for the CALL_EXPR
8984 closest to the identifier. */
8985 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8987 /* Handle a late-specified return type. */
8990 if (type_uses_auto (type))
8992 if (!declarator->u.function.late_return_type)
8994 error ("%qs function uses %<auto%> type specifier without"
8995 " late return type", name);
8996 return error_mark_node;
8998 else if (!is_auto (type))
9000 error ("%qs function with late return type has"
9001 " %qT as its type rather than plain %<auto%>",
9003 return error_mark_node;
9006 else if (declarator->u.function.late_return_type)
9008 error ("%qs function with late return type not declared"
9009 " with %<auto%> type specifier", name);
9010 return error_mark_node;
9013 type = splice_late_return_type
9014 (type, declarator->u.function.late_return_type);
9015 if (type == error_mark_node)
9016 return error_mark_node;
9018 if (ctype == NULL_TREE
9019 && decl_context == FIELD
9021 && (friendp == 0 || dname == current_class_name))
9022 ctype = current_class_type;
9024 if (ctype && (sfk == sfk_constructor
9025 || sfk == sfk_destructor))
9027 /* We are within a class's scope. If our declarator name
9028 is the same as the class name, and we are defining
9029 a function, then it is a constructor/destructor, and
9030 therefore returns a void type. */
9032 /* ISO C++ 12.4/2. A destructor may not be declared
9033 const or volatile. A destructor may not be
9036 ISO C++ 12.1. A constructor may not be declared
9037 const or volatile. A constructor may not be
9038 virtual. A constructor may not be static. */
9040 error ((flags == DTOR_FLAG)
9041 ? "destructor cannot be static member function"
9042 : "constructor cannot be static member function");
9045 error ((flags == DTOR_FLAG)
9046 ? "destructors may not be cv-qualified"
9047 : "constructors may not be cv-qualified");
9048 memfn_quals = TYPE_UNQUALIFIED;
9051 if (decl_context == FIELD
9052 && !member_function_or_else (ctype,
9055 return error_mark_node;
9057 if (flags != DTOR_FLAG)
9059 /* It's a constructor. */
9064 permerror (input_location, "constructors cannot be declared virtual");
9067 if (decl_context == FIELD
9068 && sfk != sfk_constructor)
9069 return error_mark_node;
9071 if (decl_context == FIELD)
9077 error ("can%'t initialize friend function %qs", name);
9080 /* Cannot be both friend and virtual. */
9081 error ("virtual functions cannot be friends");
9084 if (decl_context == NORMAL)
9085 error ("friend declaration not in class definition");
9086 if (current_function_decl && funcdef_flag)
9087 error ("can%'t define friend function %qs in a local "
9091 else if (ctype && sfk == sfk_conversion)
9095 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9100 arg_types = grokparms (declarator->u.function.parameters,
9103 if (inner_declarator
9104 && inner_declarator->kind == cdk_id
9105 && inner_declarator->u.id.sfk == sfk_destructor
9106 && arg_types != void_list_node)
9108 error ("destructors may not have parameters");
9109 arg_types = void_list_node;
9113 type = build_function_type (type, arg_types);
9120 /* Filter out pointers-to-references and references-to-references.
9121 We can get these if a TYPE_DECL is used. */
9123 if (TREE_CODE (type) == REFERENCE_TYPE)
9125 if (declarator->kind != cdk_reference)
9127 error ("cannot declare pointer to %q#T", type);
9128 type = TREE_TYPE (type);
9131 /* In C++0x, we allow reference to reference declarations
9132 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9133 and template type arguments [14.3.1/4 temp.arg.type]. The
9134 check for direct reference to reference declarations, which
9135 are still forbidden, occurs below. Reasoning behind the change
9136 can be found in DR106, DR540, and the rvalue reference
9138 else if (cxx_dialect == cxx98)
9140 error ("cannot declare reference to %q#T", type);
9141 type = TREE_TYPE (type);
9144 else if (VOID_TYPE_P (type))
9146 if (declarator->kind == cdk_reference)
9147 error ("cannot declare reference to %q#T", type);
9148 else if (declarator->kind == cdk_ptrmem)
9149 error ("cannot declare pointer to %q#T member", type);
9152 /* We now know that the TYPE_QUALS don't apply to the decl,
9153 but to the target of the pointer. */
9154 type_quals = TYPE_UNQUALIFIED;
9156 if (declarator->kind == cdk_ptrmem
9157 && (TREE_CODE (type) == FUNCTION_TYPE
9158 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9160 memfn_quals |= type_memfn_quals (type);
9161 type = build_memfn_type (type,
9162 declarator->u.pointer.class_type,
9164 if (type == error_mark_node)
9165 return error_mark_node;
9166 memfn_quals = TYPE_UNQUALIFIED;
9169 if (TREE_CODE (type) == FUNCTION_TYPE
9170 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9171 error (declarator->kind == cdk_reference
9172 ? G_("cannot declare reference to qualified function type %qT")
9173 : G_("cannot declare pointer to qualified function type %qT"),
9176 /* When the pointed-to type involves components of variable size,
9177 care must be taken to ensure that the size evaluation code is
9178 emitted early enough to dominate all the possible later uses
9179 and late enough for the variables on which it depends to have
9182 This is expected to happen automatically when the pointed-to
9183 type has a name/declaration of it's own, but special attention
9184 is required if the type is anonymous.
9186 We handle the NORMAL and FIELD contexts here by inserting a
9187 dummy statement that just evaluates the size at a safe point
9188 and ensures it is not deferred until e.g. within a deeper
9189 conditional context (c++/43555).
9191 We expect nothing to be needed here for PARM or TYPENAME.
9192 Evaluating the size at this point for TYPENAME would
9193 actually be incorrect, as we might be in the middle of an
9194 expression with side effects on the pointed-to type size
9195 "arguments" prior to the pointer declaration point and the
9196 size evaluation could end up prior to the side effects. */
9198 if (!TYPE_NAME (type)
9199 && (decl_context == NORMAL || decl_context == FIELD)
9200 && at_function_scope_p ()
9201 && variably_modified_type_p (type, NULL_TREE))
9203 /* First break out any side-effects. */
9204 stabilize_vla_size (TYPE_SIZE (type));
9205 /* And then force evaluation of the SAVE_EXPR. */
9206 finish_expr_stmt (TYPE_SIZE (type));
9209 if (declarator->kind == cdk_reference)
9211 /* In C++0x, the type we are creating a reference to might be
9212 a typedef which is itself a reference type. In that case,
9213 we follow the reference collapsing rules in
9214 [7.1.3/8 dcl.typedef] to create the final reference type:
9216 "If a typedef TD names a type that is a reference to a type
9217 T, an attempt to create the type 'lvalue reference to cv TD'
9218 creates the type 'lvalue reference to T,' while an attempt
9219 to create the type "rvalue reference to cv TD' creates the
9222 if (VOID_TYPE_P (type))
9223 /* We already gave an error. */;
9224 else if (TREE_CODE (type) == REFERENCE_TYPE)
9226 if (declarator->u.reference.rvalue_ref)
9227 /* Leave type alone. */;
9229 type = cp_build_reference_type (TREE_TYPE (type), false);
9232 type = cp_build_reference_type
9233 (type, declarator->u.reference.rvalue_ref);
9235 /* In C++0x, we need this check for direct reference to
9236 reference declarations, which are forbidden by
9237 [8.3.2/5 dcl.ref]. Reference to reference declarations
9238 are only allowed indirectly through typedefs and template
9239 type arguments. Example:
9241 void foo(int & &); // invalid ref-to-ref decl
9243 typedef int & int_ref;
9244 void foo(int_ref &); // valid ref-to-ref decl
9246 if (inner_declarator && inner_declarator->kind == cdk_reference)
9247 error ("cannot declare reference to %q#T, which is not "
9248 "a typedef or a template type argument", type);
9250 else if (TREE_CODE (type) == METHOD_TYPE)
9251 type = build_ptrmemfunc_type (build_pointer_type (type));
9252 else if (declarator->kind == cdk_ptrmem)
9254 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9256 if (declarator->u.pointer.class_type == error_mark_node)
9257 /* We will already have complained. */
9258 type = error_mark_node;
9260 type = build_ptrmem_type (declarator->u.pointer.class_type,
9264 type = build_pointer_type (type);
9266 /* Process a list of type modifier keywords (such as
9267 const or volatile) that were given inside the `*' or `&'. */
9269 if (declarator->u.pointer.qualifiers)
9272 = cp_build_qualified_type (type,
9273 declarator->u.pointer.qualifiers);
9274 type_quals = cp_type_quals (type);
9287 /* We need to stabilize side-effects in VLA sizes for regular array
9288 declarations too, not just pointers to arrays. */
9289 if (type != error_mark_node && !TYPE_NAME (type)
9290 && (decl_context == NORMAL || decl_context == FIELD)
9291 && at_function_scope_p ()
9292 && variably_modified_type_p (type, NULL_TREE))
9293 stabilize_vla_size (TYPE_SIZE (type));
9295 /* A `constexpr' specifier used in an object declaration declares
9296 the object as `const'. */
9297 if (constexpr_p && innermost_code != cdk_function)
9299 if (type_quals & TYPE_QUAL_CONST)
9300 error ("both %<const%> and %<constexpr%> cannot be used here");
9301 if (type_quals & TYPE_QUAL_VOLATILE)
9302 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9303 type_quals |= TYPE_QUAL_CONST;
9304 type = cp_build_qualified_type (type, type_quals);
9307 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9308 && TREE_CODE (type) != FUNCTION_TYPE
9309 && TREE_CODE (type) != METHOD_TYPE)
9311 error ("template-id %qD used as a declarator",
9313 unqualified_id = dname;
9316 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9317 qualified with a class-name, turn it into a METHOD_TYPE, unless
9318 we know that the function is static. We take advantage of this
9319 opportunity to do other processing that pertains to entities
9320 explicitly declared to be class members. Note that if DECLARATOR
9321 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9322 would not have exited the loop above. */
9324 && declarator->u.id.qualifying_scope
9325 && TYPE_P (declarator->u.id.qualifying_scope))
9329 ctype = declarator->u.id.qualifying_scope;
9330 ctype = TYPE_MAIN_VARIANT (ctype);
9332 while (t != NULL_TREE && CLASS_TYPE_P (t))
9334 /* You're supposed to have one `template <...>' for every
9335 template class, but you don't need one for a full
9336 specialization. For example:
9338 template <class T> struct S{};
9339 template <> struct S<int> { void f(); };
9340 void S<int>::f () {}
9342 is correct; there shouldn't be a `template <>' for the
9343 definition of `S<int>::f'. */
9344 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9345 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9346 /* T is an explicit (not partial) specialization. All
9347 containing classes must therefore also be explicitly
9350 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9351 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9352 template_count += 1;
9354 t = TYPE_MAIN_DECL (t);
9355 t = DECL_CONTEXT (t);
9358 if (ctype == current_class_type)
9362 permerror (input_location, "member functions are implicitly friends of their class");
9366 permerror (declarator->id_loc,
9367 "extra qualification %<%T::%> on member %qs",
9370 else if (/* If the qualifying type is already complete, then we
9371 can skip the following checks. */
9372 !COMPLETE_TYPE_P (ctype)
9373 && (/* If the function is being defined, then
9374 qualifying type must certainly be complete. */
9376 /* A friend declaration of "T::f" is OK, even if
9377 "T" is a template parameter. But, if this
9378 function is not a friend, the qualifying type
9380 || (!friendp && !CLASS_TYPE_P (ctype))
9381 /* For a declaration, the type need not be
9382 complete, if either it is dependent (since there
9383 is no meaningful definition of complete in that
9384 case) or the qualifying class is currently being
9386 || !(dependent_type_p (ctype)
9387 || currently_open_class (ctype)))
9388 /* Check that the qualifying type is complete. */
9389 && !complete_type_or_else (ctype, NULL_TREE))
9390 return error_mark_node;
9391 else if (TREE_CODE (type) == FUNCTION_TYPE)
9393 if (current_class_type
9394 && (!friendp || funcdef_flag))
9397 ? "cannot define member function %<%T::%s%> within %<%T%>"
9398 : "cannot declare member function %<%T::%s%> within %<%T%>",
9399 ctype, name, current_class_type);
9400 return error_mark_node;
9403 else if (declspecs->specs[(int)ds_typedef]
9404 && current_class_type)
9406 error ("cannot declare member %<%T::%s%> within %qT",
9407 ctype, name, current_class_type);
9408 return error_mark_node;
9412 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9413 ctype = current_class_type;
9415 /* Now TYPE has the actual type. */
9420 *attrlist = chainon (returned_attrs, *attrlist);
9422 attrlist = &returned_attrs;
9425 /* Handle parameter packs. */
9426 if (parameter_pack_p)
9428 if (decl_context == PARM)
9429 /* Turn the type into a pack expansion.*/
9430 type = make_pack_expansion (type);
9432 error ("non-parameter %qs cannot be a parameter pack", name);
9435 /* Did array size calculations overflow? */
9437 if (TREE_CODE (type) == ARRAY_TYPE
9438 && COMPLETE_TYPE_P (type)
9439 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9440 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9442 error ("size of array %qs is too large", name);
9443 /* If we proceed with the array type as it is, we'll eventually
9444 crash in tree_low_cst(). */
9445 type = error_mark_node;
9448 if ((decl_context == FIELD || decl_context == PARM)
9449 && !processing_template_decl
9450 && variably_modified_type_p (type, NULL_TREE))
9452 if (decl_context == FIELD)
9453 error ("data member may not have variably modified type %qT", type);
9455 error ("parameter may not have variably modified type %qT", type);
9456 type = error_mark_node;
9459 if (explicitp == 1 || (explicitp && friendp))
9461 /* [dcl.fct.spec] The explicit specifier shall only be used in
9462 declarations of constructors within a class definition. */
9463 error ("only declarations of constructors can be %<explicit%>");
9467 if (storage_class == sc_mutable)
9469 if (decl_context != FIELD || friendp)
9471 error ("non-member %qs cannot be declared %<mutable%>", name);
9472 storage_class = sc_none;
9474 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9476 error ("non-object member %qs cannot be declared %<mutable%>", name);
9477 storage_class = sc_none;
9479 else if (TREE_CODE (type) == FUNCTION_TYPE
9480 || TREE_CODE (type) == METHOD_TYPE)
9482 error ("function %qs cannot be declared %<mutable%>", name);
9483 storage_class = sc_none;
9487 error ("static %qs cannot be declared %<mutable%>", name);
9488 storage_class = sc_none;
9490 else if (type_quals & TYPE_QUAL_CONST)
9492 error ("const %qs cannot be declared %<mutable%>", name);
9493 storage_class = sc_none;
9495 else if (TREE_CODE (type) == REFERENCE_TYPE)
9497 permerror (input_location, "reference %qs cannot be declared "
9498 "%<mutable%>", name);
9499 storage_class = sc_none;
9503 /* If this is declaring a typedef name, return a TYPE_DECL. */
9504 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9508 /* Note that the grammar rejects storage classes
9509 in typenames, fields or parameters. */
9510 if (current_lang_name == lang_name_java)
9511 TYPE_FOR_JAVA (type) = 1;
9513 /* This declaration:
9515 typedef void f(int) const;
9517 declares a function type which is not a member of any
9518 particular class, but which is cv-qualified; for
9519 example "f S::*" declares a pointer to a const-qualified
9520 member function of S. We record the cv-qualification in the
9522 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9524 type = apply_memfn_quals (type, memfn_quals);
9526 /* We have now dealt with these qualifiers. */
9527 memfn_quals = TYPE_UNQUALIFIED;
9530 if (type_uses_auto (type))
9532 error ("typedef declared %<auto%>");
9533 type = error_mark_node;
9536 if (decl_context == FIELD)
9537 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9539 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9540 if (id_declarator && declarator->u.id.qualifying_scope) {
9541 error_at (DECL_SOURCE_LOCATION (decl),
9542 "typedef name may not be a nested-name-specifier");
9543 TREE_TYPE (decl) = error_mark_node;
9546 if (decl_context != FIELD)
9548 if (!current_function_decl)
9549 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9550 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9551 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9552 (current_function_decl)))
9553 /* The TYPE_DECL is "abstract" because there will be
9554 clones of this constructor/destructor, and there will
9555 be copies of this TYPE_DECL generated in those
9557 DECL_ABSTRACT (decl) = 1;
9559 else if (constructor_name_p (unqualified_id, current_class_type))
9560 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9561 "as enclosing class",
9564 /* If the user declares "typedef struct {...} foo" then the
9565 struct will have an anonymous name. Fill that name in now.
9566 Nothing can refer to it, so nothing needs know about the name
9568 if (type != error_mark_node
9571 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9572 && TYPE_ANONYMOUS_P (type)
9573 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9577 /* Replace the anonymous name with the real name everywhere. */
9578 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9580 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9581 /* We do not rename the debug info representing the
9582 anonymous tagged type because the standard says in
9583 [dcl.typedef] that the naming applies only for
9584 linkage purposes. */
9585 /*debug_hooks->set_name (t, decl);*/
9586 TYPE_NAME (t) = decl;
9589 if (TYPE_LANG_SPECIFIC (type))
9590 TYPE_WAS_ANONYMOUS (type) = 1;
9592 /* If this is a typedef within a template class, the nested
9593 type is a (non-primary) template. The name for the
9594 template needs updating as well. */
9595 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9596 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9597 = TYPE_IDENTIFIER (type);
9599 /* Adjust linkage now that we aren't anonymous anymore. */
9600 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9601 determine_visibility (TYPE_MAIN_DECL (type));
9603 /* FIXME remangle member functions; member functions of a
9604 type with external linkage have external linkage. */
9608 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9609 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9611 bad_specifiers (decl, BSP_TYPE, virtualp,
9612 memfn_quals != TYPE_UNQUALIFIED,
9613 inlinep, friendp, raises != NULL_TREE);
9618 /* Detect the case of an array type of unspecified size
9619 which came, as such, direct from a typedef name.
9620 We must copy the type, so that the array's domain can be
9621 individually set by the object's initializer. */
9623 if (type && typedef_type
9624 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9625 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9626 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9628 /* Detect where we're using a typedef of function type to declare a
9629 function. PARMS will not be set, so we must create it now. */
9631 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9633 tree decls = NULL_TREE;
9636 for (args = TYPE_ARG_TYPES (type);
9637 args && args != void_list_node;
9638 args = TREE_CHAIN (args))
9640 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9642 DECL_CHAIN (decl) = decls;
9646 parms = nreverse (decls);
9648 if (decl_context != TYPENAME)
9650 /* A cv-qualifier-seq shall only be part of the function type
9651 for a non-static member function. [8.3.5/4 dcl.fct] */
9652 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9653 && (current_class_type == NULL_TREE || staticp) )
9656 ? G_("qualified function types cannot be used to "
9657 "declare static member functions")
9658 : G_("qualified function types cannot be used to "
9659 "declare free functions"));
9660 type = TYPE_MAIN_VARIANT (type);
9663 /* The qualifiers on the function type become the qualifiers on
9664 the non-static member function. */
9665 memfn_quals |= type_memfn_quals (type);
9666 type_quals = TYPE_UNQUALIFIED;
9670 /* If this is a type name (such as, in a cast or sizeof),
9671 compute the type and return it now. */
9673 if (decl_context == TYPENAME)
9675 /* Note that the grammar rejects storage classes
9676 in typenames, fields or parameters. */
9677 if (type_quals != TYPE_UNQUALIFIED)
9678 type_quals = TYPE_UNQUALIFIED;
9680 /* Special case: "friend class foo" looks like a TYPENAME context. */
9683 if (type_quals != TYPE_UNQUALIFIED)
9685 error ("type qualifiers specified for friend class declaration");
9686 type_quals = TYPE_UNQUALIFIED;
9690 error ("%<inline%> specified for friend class declaration");
9696 /* Don't allow friend declaration without a class-key. */
9697 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9698 permerror (input_location, "template parameters cannot be friends");
9699 else if (TREE_CODE (type) == TYPENAME_TYPE)
9700 permerror (input_location, "friend declaration requires class-key, "
9701 "i.e. %<friend class %T::%D%>",
9702 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9704 permerror (input_location, "friend declaration requires class-key, "
9705 "i.e. %<friend %#T%>",
9709 /* Only try to do this stuff if we didn't already give up. */
9710 if (type != integer_type_node)
9712 /* A friendly class? */
9713 if (current_class_type)
9714 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9717 error ("trying to make class %qT a friend of global scope",
9720 type = void_type_node;
9723 else if (memfn_quals)
9725 if (ctype == NULL_TREE
9726 && TREE_CODE (type) == METHOD_TYPE)
9727 ctype = TYPE_METHOD_BASETYPE (type);
9730 type = build_memfn_type (type, ctype, memfn_quals);
9731 /* Core issue #547: need to allow this in template type args. */
9732 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9733 type = apply_memfn_quals (type, memfn_quals);
9735 error ("invalid qualifiers on non-member function type");
9740 else if (unqualified_id == NULL_TREE && decl_context != PARM
9741 && decl_context != CATCHPARM
9742 && TREE_CODE (type) != UNION_TYPE
9745 error ("abstract declarator %qT used as declaration", type);
9746 return error_mark_node;
9749 /* Only functions may be declared using an operator-function-id. */
9751 && IDENTIFIER_OPNAME_P (unqualified_id)
9752 && TREE_CODE (type) != FUNCTION_TYPE
9753 && TREE_CODE (type) != METHOD_TYPE)
9755 error ("declaration of %qD as non-function", unqualified_id);
9756 return error_mark_node;
9759 /* We don't check parameter types here because we can emit a better
9760 error message later. */
9761 if (decl_context != PARM)
9763 type = check_var_type (unqualified_id, type);
9764 if (type == error_mark_node)
9765 return error_mark_node;
9768 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9769 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9771 if (decl_context == PARM || decl_context == CATCHPARM)
9773 if (ctype || in_namespace)
9774 error ("cannot use %<::%> in parameter declaration");
9776 if (type_uses_auto (type))
9778 error ("parameter declared %<auto%>");
9779 type = error_mark_node;
9782 /* A parameter declared as an array of T is really a pointer to T.
9783 One declared as a function is really a pointer to a function.
9784 One declared as a member is really a pointer to member. */
9786 if (TREE_CODE (type) == ARRAY_TYPE)
9788 /* Transfer const-ness of array into that of type pointed to. */
9789 type = build_pointer_type (TREE_TYPE (type));
9790 type_quals = TYPE_UNQUALIFIED;
9792 else if (TREE_CODE (type) == FUNCTION_TYPE)
9793 type = build_pointer_type (type);
9796 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9797 && !NEW_DELETE_OPNAME_P (unqualified_id))
9799 cp_cv_quals real_quals = memfn_quals;
9800 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9801 real_quals |= TYPE_QUAL_CONST;
9802 type = build_memfn_type (type, ctype, real_quals);
9808 if (decl_context == PARM)
9810 decl = cp_build_parm_decl (unqualified_id, type);
9812 bad_specifiers (decl, BSP_PARM, virtualp,
9813 memfn_quals != TYPE_UNQUALIFIED,
9814 inlinep, friendp, raises != NULL_TREE);
9816 else if (decl_context == FIELD)
9818 /* The C99 flexible array extension. */
9819 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9820 && TYPE_DOMAIN (type) == NULL_TREE)
9822 tree itype = compute_array_index_type (dname, integer_zero_node,
9823 tf_warning_or_error);
9824 type = build_cplus_array_type (TREE_TYPE (type), itype);
9827 if (type == error_mark_node)
9829 /* Happens when declaring arrays of sizes which
9830 are error_mark_node, for example. */
9833 else if (in_namespace && !friendp)
9835 /* Something like struct S { int N::j; }; */
9836 error ("invalid use of %<::%>");
9837 return error_mark_node;
9839 else if (TREE_CODE (type) == FUNCTION_TYPE
9840 || TREE_CODE (type) == METHOD_TYPE)
9843 tree function_context;
9847 /* This should never happen in pure C++ (the check
9848 could be an assert). It could happen in
9849 Objective-C++ if someone writes invalid code that
9850 uses a function declaration for an instance
9851 variable or property (instance variables and
9852 properties are parsed as FIELD_DECLs, but they are
9853 part of an Objective-C class, not a C++ class).
9854 That code is invalid and is caught by this
9858 error ("declaration of function %qD in invalid context",
9860 return error_mark_node;
9863 /* ``A union may [ ... ] not [ have ] virtual functions.''
9865 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9867 error ("function %qD declared virtual inside a union",
9869 return error_mark_node;
9872 if (NEW_DELETE_OPNAME_P (unqualified_id))
9876 error ("%qD cannot be declared virtual, since it "
9884 /* Check that the name used for a destructor makes sense. */
9885 if (sfk == sfk_destructor)
9887 tree uqname = id_declarator->u.id.unqualified_name;
9891 gcc_assert (friendp);
9892 error ("expected qualified name in friend declaration "
9893 "for destructor %qD", uqname);
9894 return error_mark_node;
9897 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9899 error ("declaration of %qD as member of %qT",
9901 return error_mark_node;
9905 error ("a destructor cannot be %<constexpr%>");
9906 return error_mark_node;
9909 else if (sfk == sfk_constructor && friendp && !ctype)
9911 error ("expected qualified name in friend declaration "
9912 "for constructor %qD",
9913 id_declarator->u.id.unqualified_name);
9914 return error_mark_node;
9917 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9918 function_context = (ctype != NULL_TREE) ?
9919 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9920 publicp = (! friendp || ! staticp)
9921 && function_context == NULL_TREE;
9922 decl = grokfndecl (ctype, type,
9923 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9924 ? unqualified_id : dname,
9927 virtualp, flags, memfn_quals, raises,
9928 friendp ? -1 : 0, friendp, publicp,
9929 inlinep | (2 * constexpr_p),
9931 funcdef_flag, template_count, in_namespace,
9932 attrlist, declarator->id_loc);
9933 decl = set_virt_specifiers (decl, virt_specifiers);
9934 if (decl == NULL_TREE)
9935 return error_mark_node;
9937 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9938 /* The decl and setting of decl_attr is also turned off. */
9939 decl = build_decl_attribute_variant (decl, decl_attr);
9942 /* [class.conv.ctor]
9944 A constructor declared without the function-specifier
9945 explicit that can be called with a single parameter
9946 specifies a conversion from the type of its first
9947 parameter to the type of its class. Such a constructor
9948 is called a converting constructor. */
9950 DECL_NONCONVERTING_P (decl) = 1;
9952 else if (!staticp && !dependent_type_p (type)
9953 && !COMPLETE_TYPE_P (complete_type (type))
9954 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9957 error ("field %qD has incomplete type", unqualified_id);
9959 error ("name %qT has incomplete type", type);
9961 /* If we're instantiating a template, tell them which
9962 instantiation made the field's type be incomplete. */
9963 if (current_class_type
9964 && TYPE_NAME (current_class_type)
9965 && IDENTIFIER_TEMPLATE (current_class_name)
9967 && declspecs->type == type)
9968 error (" in instantiation of template %qT",
9969 current_class_type);
9971 return error_mark_node;
9977 error ("%qE is neither function nor member function; "
9978 "cannot be declared friend", unqualified_id);
9986 /* Friends are treated specially. */
9987 if (ctype == current_class_type)
9988 ; /* We already issued a permerror. */
9989 else if (decl && DECL_NAME (decl))
9991 if (template_class_depth (current_class_type) == 0)
9993 decl = check_explicit_specialization
9994 (unqualified_id, decl, template_count,
9995 2 * funcdef_flag + 4);
9996 if (decl == error_mark_node)
9997 return error_mark_node;
10000 decl = do_friend (ctype, unqualified_id, decl,
10006 return error_mark_node;
10009 /* Structure field. It may not be a function, except for C++. */
10011 if (decl == NULL_TREE)
10017 /* An attempt is being made to initialize a non-static
10018 member. But, from [class.mem]:
10020 4 A member-declarator can contain a
10021 constant-initializer only if it declares a static
10022 member (_class.static_) of integral or enumeration
10023 type, see _class.static.data_.
10025 This used to be relatively common practice, but
10026 the rest of the compiler does not correctly
10027 handle the initialization unless the member is
10028 static so we make it static below. */
10029 if (cxx_dialect >= cxx0x)
10031 sorry ("non-static data member initializers");
10035 permerror (input_location, "ISO C++ forbids initialization of member %qD",
10037 permerror (input_location, "making %qD static", unqualified_id);
10045 /* C++ allows static class members. All other work
10046 for this is done by grokfield. */
10047 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10048 set_linkage_for_static_data_member (decl);
10049 /* Even if there is an in-class initialization, DECL
10050 is considered undefined until an out-of-class
10051 definition is provided. */
10052 DECL_EXTERNAL (decl) = 1;
10055 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10057 if (constexpr_p && !initialized)
10059 error ("constexpr static data member %qD must have an "
10060 "initializer", decl);
10061 constexpr_p = false;
10068 error ("non-static data member %qE declared %<constexpr%>",
10070 constexpr_p = false;
10072 decl = build_decl (input_location,
10073 FIELD_DECL, unqualified_id, type);
10074 DECL_NONADDRESSABLE_P (decl) = bitfield;
10075 if (bitfield && !unqualified_id)
10076 TREE_NO_WARNING (decl) = 1;
10078 if (storage_class == sc_mutable)
10080 DECL_MUTABLE_P (decl) = 1;
10081 storage_class = sc_none;
10085 bad_specifiers (decl, BSP_FIELD, virtualp,
10086 memfn_quals != TYPE_UNQUALIFIED,
10087 inlinep, friendp, raises != NULL_TREE);
10090 else if (TREE_CODE (type) == FUNCTION_TYPE
10091 || TREE_CODE (type) == METHOD_TYPE)
10093 tree original_name;
10096 if (!unqualified_id)
10097 return error_mark_node;
10099 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10100 original_name = dname;
10102 original_name = unqualified_id;
10104 if (storage_class == sc_auto)
10105 error ("storage class %<auto%> invalid for function %qs", name);
10106 else if (storage_class == sc_register)
10107 error ("storage class %<register%> invalid for function %qs", name);
10109 error ("storage class %<__thread%> invalid for function %qs", name);
10111 if (virt_specifiers)
10112 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10113 /* Function declaration not at top level.
10114 Storage classes other than `extern' are not allowed
10115 and `extern' makes no difference. */
10116 if (! toplevel_bindings_p ()
10117 && (storage_class == sc_static
10118 || declspecs->specs[(int)ds_inline])
10121 if (storage_class == sc_static)
10122 pedwarn (input_location, OPT_pedantic,
10123 "%<static%> specified invalid for function %qs "
10124 "declared out of global scope", name);
10126 pedwarn (input_location, OPT_pedantic,
10127 "%<inline%> specifier invalid for function %qs "
10128 "declared out of global scope", name);
10131 if (ctype != NULL_TREE
10132 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
10134 error ("%q#T is not a class or a namespace", ctype);
10138 if (ctype == NULL_TREE)
10142 error ("virtual non-class function %qs", name);
10145 else if (sfk == sfk_constructor
10146 || sfk == sfk_destructor)
10148 error (funcdef_flag
10149 ? "%qs defined in a non-class scope"
10150 : "%qs declared in a non-class scope", name);
10155 /* Record presence of `static'. */
10156 publicp = (ctype != NULL_TREE
10157 || storage_class == sc_extern
10158 || storage_class != sc_static);
10160 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10161 virtualp, flags, memfn_quals, raises,
10163 publicp, inlinep | (2 * constexpr_p), sfk,
10165 template_count, in_namespace, attrlist,
10166 declarator->id_loc);
10167 if (decl == NULL_TREE)
10168 return error_mark_node;
10172 int invalid_static = 0;
10174 /* Don't allow a static member function in a class, and forbid
10175 declaring main to be static. */
10176 if (TREE_CODE (type) == METHOD_TYPE)
10178 permerror (input_location, "cannot declare member function %qD to have "
10179 "static linkage", decl);
10180 invalid_static = 1;
10182 else if (current_function_decl)
10184 /* FIXME need arm citation */
10185 error ("cannot declare static function inside another function");
10186 invalid_static = 1;
10189 if (invalid_static)
10192 storage_class = sc_none;
10198 /* It's a variable. */
10200 /* An uninitialized decl with `extern' is a reference. */
10201 decl = grokvardecl (type, unqualified_id,
10204 (type_quals & TYPE_QUAL_CONST) != 0,
10205 ctype ? ctype : in_namespace);
10206 bad_specifiers (decl, BSP_VAR, virtualp,
10207 memfn_quals != TYPE_UNQUALIFIED,
10208 inlinep, friendp, raises != NULL_TREE);
10212 DECL_CONTEXT (decl) = ctype;
10215 permerror (input_location, "%<static%> may not be used when defining "
10216 "(as opposed to declaring) a static data member");
10218 storage_class = sc_none;
10220 if (storage_class == sc_register && TREE_STATIC (decl))
10222 error ("static member %qD declared %<register%>", decl);
10223 storage_class = sc_none;
10225 if (storage_class == sc_extern && pedantic)
10227 pedwarn (input_location, OPT_pedantic,
10228 "cannot explicitly declare member %q#D to have "
10229 "extern linkage", decl);
10230 storage_class = sc_none;
10233 else if (constexpr_p && DECL_EXTERNAL (decl))
10235 error ("declaration of constexpr variable %qD is not a definition",
10237 constexpr_p = false;
10241 if (storage_class == sc_extern && initialized && !funcdef_flag)
10243 if (toplevel_bindings_p ())
10245 /* It's common practice (and completely valid) to have a const
10246 be initialized and declared extern. */
10247 if (!(type_quals & TYPE_QUAL_CONST))
10248 warning (0, "%qs initialized and declared %<extern%>", name);
10252 error ("%qs has both %<extern%> and initializer", name);
10253 return error_mark_node;
10257 /* Record `register' declaration for warnings on &
10258 and in case doing stupid register allocation. */
10260 if (storage_class == sc_register)
10261 DECL_REGISTER (decl) = 1;
10262 else if (storage_class == sc_extern)
10263 DECL_THIS_EXTERN (decl) = 1;
10264 else if (storage_class == sc_static)
10265 DECL_THIS_STATIC (decl) = 1;
10267 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10268 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10269 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10271 /* Record constancy and volatility on the DECL itself . There's
10272 no need to do this when processing a template; we'll do this
10273 for the instantiated declaration based on the type of DECL. */
10274 if (!processing_template_decl)
10275 cp_apply_type_quals_to_decl (type_quals, decl);
10281 /* Subroutine of start_function. Ensure that each of the parameter
10282 types (as listed in PARMS) is complete, as is required for a
10283 function definition. */
10286 require_complete_types_for_parms (tree parms)
10288 for (; parms; parms = DECL_CHAIN (parms))
10290 if (dependent_type_p (TREE_TYPE (parms)))
10292 if (!VOID_TYPE_P (TREE_TYPE (parms))
10293 && complete_type_or_else (TREE_TYPE (parms), parms))
10295 relayout_decl (parms);
10296 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10299 /* grokparms or complete_type_or_else will have already issued
10301 TREE_TYPE (parms) = error_mark_node;
10305 /* Returns nonzero if T is a local variable. */
10308 local_variable_p (const_tree t)
10310 if ((TREE_CODE (t) == VAR_DECL
10311 /* A VAR_DECL with a context that is a _TYPE is a static data
10313 && !TYPE_P (CP_DECL_CONTEXT (t))
10314 /* Any other non-local variable must be at namespace scope. */
10315 && !DECL_NAMESPACE_SCOPE_P (t))
10316 || (TREE_CODE (t) == PARM_DECL))
10322 /* Like local_variable_p, but suitable for use as a tree-walking
10326 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10327 void *data ATTRIBUTE_UNUSED)
10329 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10331 else if (TYPE_P (*tp))
10332 *walk_subtrees = 0;
10338 /* Check that ARG, which is a default-argument expression for a
10339 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10340 something goes wrong. DECL may also be a _TYPE node, rather than a
10341 DECL, if there is no DECL available. */
10344 check_default_argument (tree decl, tree arg)
10349 if (TREE_CODE (arg) == DEFAULT_ARG)
10350 /* We get a DEFAULT_ARG when looking at an in-class declaration
10351 with a default argument. Ignore the argument for now; we'll
10352 deal with it after the class is complete. */
10361 decl_type = TREE_TYPE (decl);
10363 if (arg == error_mark_node
10364 || decl == error_mark_node
10365 || TREE_TYPE (arg) == error_mark_node
10366 || decl_type == error_mark_node)
10367 /* Something already went wrong. There's no need to check
10369 return error_mark_node;
10371 /* [dcl.fct.default]
10373 A default argument expression is implicitly converted to the
10375 if (!TREE_TYPE (arg)
10376 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10379 error ("default argument for %q#D has type %qT",
10380 decl, TREE_TYPE (arg));
10382 error ("default argument for parameter of type %qT has type %qT",
10383 decl_type, TREE_TYPE (arg));
10385 return error_mark_node;
10388 /* [dcl.fct.default]
10390 Local variables shall not be used in default argument
10393 The keyword `this' shall not be used in a default argument of a
10394 member function. */
10395 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10398 error ("default argument %qE uses local variable %qD", arg, var);
10399 return error_mark_node;
10406 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10409 type_is_deprecated (tree type)
10411 enum tree_code code;
10412 if (TREE_DEPRECATED (type))
10414 if (TYPE_NAME (type)
10415 && TREE_DEPRECATED (TYPE_NAME (type)))
10418 /* Do warn about using typedefs to a deprecated class. */
10419 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10420 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10422 code = TREE_CODE (type);
10424 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10425 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10426 || code == METHOD_TYPE || code == ARRAY_TYPE)
10427 return type_is_deprecated (TREE_TYPE (type));
10429 if (TYPE_PTRMEMFUNC_P (type))
10430 return type_is_deprecated
10431 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10436 /* Decode the list of parameter types for a function type.
10437 Given the list of things declared inside the parens,
10438 return a list of types.
10440 If this parameter does not end with an ellipsis, we append
10443 *PARMS is set to the chain of PARM_DECLs created. */
10446 grokparms (tree parmlist, tree *parms)
10448 tree result = NULL_TREE;
10449 tree decls = NULL_TREE;
10453 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10455 tree type = NULL_TREE;
10456 tree init = TREE_PURPOSE (parm);
10457 tree decl = TREE_VALUE (parm);
10458 const char *errmsg;
10460 if (parm == void_list_node)
10463 if (! decl || TREE_TYPE (decl) == error_mark_node)
10466 type = TREE_TYPE (decl);
10467 if (VOID_TYPE_P (type))
10469 if (same_type_p (type, void_type_node)
10470 && DECL_SELF_REFERENCE_P (type)
10471 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10472 /* this is a parmlist of `(void)', which is ok. */
10474 cxx_incomplete_type_error (decl, type);
10475 /* It's not a good idea to actually create parameters of
10476 type `void'; other parts of the compiler assume that a
10477 void type terminates the parameter list. */
10478 type = error_mark_node;
10479 TREE_TYPE (decl) = error_mark_node;
10482 if (type != error_mark_node
10483 && TYPE_FOR_JAVA (type)
10484 && MAYBE_CLASS_TYPE_P (type))
10486 error ("parameter %qD has Java class type", decl);
10487 type = error_mark_node;
10488 TREE_TYPE (decl) = error_mark_node;
10492 if (type != error_mark_node
10493 && (errmsg = targetm.invalid_parameter_type (type)))
10496 type = error_mark_node;
10497 TREE_TYPE (decl) = error_mark_node;
10500 if (type != error_mark_node)
10502 if (deprecated_state != DEPRECATED_SUPPRESS)
10504 tree deptype = type_is_deprecated (type);
10506 warn_deprecated_use (deptype, NULL_TREE);
10509 /* Top-level qualifiers on the parameters are
10510 ignored for function types. */
10511 type = cp_build_qualified_type (type, 0);
10512 if (TREE_CODE (type) == METHOD_TYPE)
10514 error ("parameter %qD invalidly declared method type", decl);
10515 type = build_pointer_type (type);
10516 TREE_TYPE (decl) = type;
10518 else if (abstract_virtuals_error (decl, type))
10519 any_error = 1; /* Seems like a good idea. */
10520 else if (POINTER_TYPE_P (type))
10522 /* [dcl.fct]/6, parameter types cannot contain pointers
10523 (references) to arrays of unknown bound. */
10524 tree t = TREE_TYPE (type);
10525 int ptr = TYPE_PTR_P (type);
10529 if (TYPE_PTR_P (t))
10531 else if (TREE_CODE (t) != ARRAY_TYPE)
10533 else if (!TYPE_DOMAIN (t))
10537 if (TREE_CODE (t) == ARRAY_TYPE)
10539 ? G_("parameter %qD includes pointer to array of "
10540 "unknown bound %qT")
10541 : G_("parameter %qD includes reference to array of "
10542 "unknown bound %qT"),
10548 else if (init && !processing_template_decl)
10549 init = check_default_argument (decl, init);
10552 DECL_CHAIN (decl) = decls;
10554 result = tree_cons (init, type, result);
10556 decls = nreverse (decls);
10557 result = nreverse (result);
10559 result = chainon (result, void_list_node);
10566 /* D is a constructor or overloaded `operator='.
10568 Let T be the class in which D is declared. Then, this function
10571 -1 if D's is an ill-formed constructor or copy assignment operator
10572 whose first parameter is of type `T'.
10573 0 if D is not a copy constructor or copy assignment
10575 1 if D is a copy constructor or copy assignment operator whose
10576 first parameter is a reference to non-const qualified T.
10577 2 if D is a copy constructor or copy assignment operator whose
10578 first parameter is a reference to const qualified T.
10580 This function can be used as a predicate. Positive values indicate
10581 a copy constructor and nonzero values indicate a copy assignment
10585 copy_fn_p (const_tree d)
10591 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10593 if (TREE_CODE (d) == TEMPLATE_DECL
10594 || (DECL_TEMPLATE_INFO (d)
10595 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10596 /* Instantiations of template member functions are never copy
10597 functions. Note that member functions of templated classes are
10598 represented as template functions internally, and we must
10599 accept those as copy functions. */
10602 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10606 arg_type = TREE_VALUE (args);
10607 if (arg_type == error_mark_node)
10610 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10612 /* Pass by value copy assignment operator. */
10615 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10616 && !TYPE_REF_IS_RVALUE (arg_type)
10617 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10619 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10625 args = TREE_CHAIN (args);
10627 if (args && args != void_list_node && !TREE_PURPOSE (args))
10628 /* There are more non-optional args. */
10634 /* D is a constructor or overloaded `operator='.
10636 Let T be the class in which D is declared. Then, this function
10637 returns true when D is a move constructor or move assignment
10638 operator, false otherwise. */
10641 move_fn_p (const_tree d)
10645 bool result = false;
10647 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10649 if (cxx_dialect == cxx98)
10650 /* There are no move constructors if we are in C++98 mode. */
10653 if (TREE_CODE (d) == TEMPLATE_DECL
10654 || (DECL_TEMPLATE_INFO (d)
10655 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10656 /* Instantiations of template member functions are never copy
10657 functions. Note that member functions of templated classes are
10658 represented as template functions internally, and we must
10659 accept those as copy functions. */
10662 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10666 arg_type = TREE_VALUE (args);
10667 if (arg_type == error_mark_node)
10670 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10671 && TYPE_REF_IS_RVALUE (arg_type)
10672 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10676 args = TREE_CHAIN (args);
10678 if (args && args != void_list_node && !TREE_PURPOSE (args))
10679 /* There are more non-optional args. */
10685 /* Remember any special properties of member function DECL. */
10688 grok_special_member_properties (tree decl)
10692 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10695 class_type = DECL_CONTEXT (decl);
10696 if (DECL_CONSTRUCTOR_P (decl))
10698 int ctor = copy_fn_p (decl);
10700 if (!DECL_ARTIFICIAL (decl))
10701 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10707 A non-template constructor for class X is a copy
10708 constructor if its first parameter is of type X&, const
10709 X&, volatile X& or const volatile X&, and either there
10710 are no other parameters or else all other parameters have
10711 default arguments. */
10712 TYPE_HAS_COPY_CTOR (class_type) = 1;
10713 if (user_provided_p (decl))
10714 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10716 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10718 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10720 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10721 if (user_provided_p (decl))
10722 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10724 else if (move_fn_p (decl) && user_provided_p (decl))
10725 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10726 else if (is_list_ctor (decl))
10727 TYPE_HAS_LIST_CTOR (class_type) = 1;
10729 if (DECL_DECLARED_CONSTEXPR_P (decl)
10730 && !copy_fn_p (decl) && !move_fn_p (decl))
10731 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10733 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10737 A non-template assignment operator for class X is a copy
10738 assignment operator if its parameter is of type X, X&, const
10739 X&, volatile X& or const volatile X&. */
10741 int assop = copy_fn_p (decl);
10745 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10746 if (user_provided_p (decl))
10747 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10749 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10751 else if (move_fn_p (decl) && user_provided_p (decl))
10752 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10754 /* Destructors are handled in check_methods. */
10757 /* Check a constructor DECL has the correct form. Complains
10758 if the class has a constructor of the form X(X). */
10761 grok_ctor_properties (const_tree ctype, const_tree decl)
10763 int ctor_parm = copy_fn_p (decl);
10769 A declaration of a constructor for a class X is ill-formed if
10770 its first parameter is of type (optionally cv-qualified) X
10771 and either there are no other parameters or else all other
10772 parameters have default arguments.
10774 We *don't* complain about member template instantiations that
10775 have this form, though; they can occur as we try to decide
10776 what constructor to use during overload resolution. Since
10777 overload resolution will never prefer such a constructor to
10778 the non-template copy constructor (which is either explicitly
10779 or implicitly defined), there's no need to worry about their
10780 existence. Theoretically, they should never even be
10781 instantiated, but that's hard to forestall. */
10782 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10790 /* An operator with this code is unary, but can also be binary. */
10793 ambi_op_p (enum tree_code code)
10795 return (code == INDIRECT_REF
10796 || code == ADDR_EXPR
10797 || code == UNARY_PLUS_EXPR
10798 || code == NEGATE_EXPR
10799 || code == PREINCREMENT_EXPR
10800 || code == PREDECREMENT_EXPR);
10803 /* An operator with this name can only be unary. */
10806 unary_op_p (enum tree_code code)
10808 return (code == TRUTH_NOT_EXPR
10809 || code == BIT_NOT_EXPR
10810 || code == COMPONENT_REF
10811 || code == TYPE_EXPR);
10814 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10815 errors are issued for invalid declarations. */
10818 grok_op_properties (tree decl, bool complain)
10820 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10822 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10823 tree name = DECL_NAME (decl);
10824 enum tree_code operator_code;
10829 /* Count the number of arguments and check for ellipsis. */
10830 for (argtype = argtypes, arity = 0;
10831 argtype && argtype != void_list_node;
10832 argtype = TREE_CHAIN (argtype))
10834 ellipsis_p = !argtype;
10836 class_type = DECL_CONTEXT (decl);
10837 if (class_type && !CLASS_TYPE_P (class_type))
10838 class_type = NULL_TREE;
10840 if (DECL_CONV_FN_P (decl))
10841 operator_code = TYPE_EXPR;
10845 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10846 if (ansi_opname (CODE) == name) \
10848 operator_code = (CODE); \
10851 else if (ansi_assopname (CODE) == name) \
10853 operator_code = (CODE); \
10854 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10858 #include "operators.def"
10859 #undef DEF_OPERATOR
10861 gcc_unreachable ();
10864 gcc_assert (operator_code != MAX_TREE_CODES);
10865 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10868 switch (operator_code)
10871 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10875 TYPE_GETS_DELETE (class_type) |= 1;
10879 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10882 case VEC_DELETE_EXPR:
10883 TYPE_GETS_DELETE (class_type) |= 2;
10890 /* [basic.std.dynamic.allocation]/1:
10892 A program is ill-formed if an allocation function is declared
10893 in a namespace scope other than global scope or declared static
10896 The same also holds true for deallocation functions. */
10897 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10898 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10900 if (DECL_NAMESPACE_SCOPE_P (decl))
10902 if (CP_DECL_CONTEXT (decl) != global_namespace)
10904 error ("%qD may not be declared within a namespace", decl);
10907 else if (!TREE_PUBLIC (decl))
10909 error ("%qD may not be declared as static", decl);
10915 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10917 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10918 DECL_IS_OPERATOR_NEW (decl) = 1;
10920 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10921 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10924 /* An operator function must either be a non-static member function
10925 or have at least one parameter of a class, a reference to a class,
10926 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10927 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10929 if (operator_code == TYPE_EXPR
10930 || operator_code == CALL_EXPR
10931 || operator_code == COMPONENT_REF
10932 || operator_code == ARRAY_REF
10933 || operator_code == NOP_EXPR)
10935 error ("%qD must be a nonstatic member function", decl);
10942 if (DECL_STATIC_FUNCTION_P (decl))
10944 error ("%qD must be either a non-static member "
10945 "function or a non-member function", decl);
10949 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10951 tree arg = non_reference (TREE_VALUE (p));
10952 if (arg == error_mark_node)
10955 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10956 because these checks are performed even on
10957 template functions. */
10958 if (MAYBE_CLASS_TYPE_P (arg)
10959 || TREE_CODE (arg) == ENUMERAL_TYPE)
10963 if (!p || p == void_list_node)
10966 error ("%qD must have an argument of class or "
10967 "enumerated type", decl);
10973 /* There are no restrictions on the arguments to an overloaded
10975 if (operator_code == CALL_EXPR)
10978 /* Warn about conversion operators that will never be used. */
10979 if (IDENTIFIER_TYPENAME_P (name)
10980 && ! DECL_TEMPLATE_INFO (decl)
10982 /* Warn only declaring the function; there is no need to
10983 warn again about out-of-class definitions. */
10984 && class_type == current_class_type)
10986 tree t = TREE_TYPE (name);
10987 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10990 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10992 if (TREE_CODE (t) == VOID_TYPE)
10993 warning (OPT_Wconversion,
10995 ? G_("conversion to a reference to void "
10996 "will never use a type conversion operator")
10997 : G_("conversion to void "
10998 "will never use a type conversion operator"));
10999 else if (class_type)
11001 if (t == class_type)
11002 warning (OPT_Wconversion,
11004 ? G_("conversion to a reference to the same type "
11005 "will never use a type conversion operator")
11006 : G_("conversion to the same type "
11007 "will never use a type conversion operator"));
11008 /* Don't force t to be complete here. */
11009 else if (MAYBE_CLASS_TYPE_P (t)
11010 && COMPLETE_TYPE_P (t)
11011 && DERIVED_FROM_P (t, class_type))
11012 warning (OPT_Wconversion,
11014 ? G_("conversion to a reference to a base class "
11015 "will never use a type conversion operator")
11016 : G_("conversion to a base class "
11017 "will never use a type conversion operator"));
11022 if (operator_code == COND_EXPR)
11025 error ("ISO C++ prohibits overloading operator ?:");
11028 else if (ellipsis_p)
11030 error ("%qD must not have variable number of arguments", decl);
11033 else if (ambi_op_p (operator_code))
11036 /* We pick the one-argument operator codes by default, so
11037 we don't have to change anything. */
11039 else if (arity == 2)
11041 /* If we thought this was a unary operator, we now know
11042 it to be a binary operator. */
11043 switch (operator_code)
11046 operator_code = MULT_EXPR;
11050 operator_code = BIT_AND_EXPR;
11053 case UNARY_PLUS_EXPR:
11054 operator_code = PLUS_EXPR;
11058 operator_code = MINUS_EXPR;
11061 case PREINCREMENT_EXPR:
11062 operator_code = POSTINCREMENT_EXPR;
11065 case PREDECREMENT_EXPR:
11066 operator_code = POSTDECREMENT_EXPR;
11070 gcc_unreachable ();
11073 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11075 if ((operator_code == POSTINCREMENT_EXPR
11076 || operator_code == POSTDECREMENT_EXPR)
11077 && ! processing_template_decl
11078 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11081 error ("postfix %qD must take %<int%> as its argument",
11084 error ("postfix %qD must take %<int%> as its second "
11092 error ("%qD must take either zero or one argument", decl);
11094 error ("%qD must take either one or two arguments", decl);
11098 /* More Effective C++ rule 6. */
11100 && (operator_code == POSTINCREMENT_EXPR
11101 || operator_code == POSTDECREMENT_EXPR
11102 || operator_code == PREINCREMENT_EXPR
11103 || operator_code == PREDECREMENT_EXPR))
11105 tree arg = TREE_VALUE (argtypes);
11106 tree ret = TREE_TYPE (TREE_TYPE (decl));
11107 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11108 arg = TREE_TYPE (arg);
11109 arg = TYPE_MAIN_VARIANT (arg);
11110 if (operator_code == PREINCREMENT_EXPR
11111 || operator_code == PREDECREMENT_EXPR)
11113 if (TREE_CODE (ret) != REFERENCE_TYPE
11114 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11116 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11117 build_reference_type (arg));
11121 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11122 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11126 else if (unary_op_p (operator_code))
11131 error ("%qD must take %<void%>", decl);
11133 error ("%qD must take exactly one argument", decl);
11137 else /* if (binary_op_p (operator_code)) */
11142 error ("%qD must take exactly one argument", decl);
11144 error ("%qD must take exactly two arguments", decl);
11148 /* More Effective C++ rule 7. */
11150 && (operator_code == TRUTH_ANDIF_EXPR
11151 || operator_code == TRUTH_ORIF_EXPR
11152 || operator_code == COMPOUND_EXPR))
11153 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11157 /* Effective C++ rule 23. */
11160 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11161 && (operator_code == PLUS_EXPR
11162 || operator_code == MINUS_EXPR
11163 || operator_code == TRUNC_DIV_EXPR
11164 || operator_code == MULT_EXPR
11165 || operator_code == TRUNC_MOD_EXPR)
11166 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11167 warning (OPT_Weffc__, "%qD should return by value", decl);
11169 /* [over.oper]/8 */
11170 for (; argtypes && argtypes != void_list_node;
11171 argtypes = TREE_CHAIN (argtypes))
11172 if (TREE_PURPOSE (argtypes))
11174 TREE_PURPOSE (argtypes) = NULL_TREE;
11175 if (operator_code == POSTINCREMENT_EXPR
11176 || operator_code == POSTDECREMENT_EXPR)
11178 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11183 error ("%qD cannot have default arguments", decl);
11191 /* Return a string giving the keyword associate with CODE. */
11193 static const char *
11194 tag_name (enum tag_types code)
11206 case typename_type:
11209 gcc_unreachable ();
11213 /* Name lookup in an elaborated-type-specifier (after the keyword
11214 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11215 elaborated-type-specifier is invalid, issue a diagnostic and return
11216 error_mark_node; otherwise, return the *_TYPE to which it referred.
11217 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11220 check_elaborated_type_specifier (enum tag_types tag_code,
11222 bool allow_template_p)
11228 struct S { struct S *p; };
11230 name lookup will find the TYPE_DECL for the implicit "S::S"
11231 typedef. Adjust for that here. */
11232 if (DECL_SELF_REFERENCE_P (decl))
11233 decl = TYPE_NAME (TREE_TYPE (decl));
11235 type = TREE_TYPE (decl);
11237 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11238 is false for this case as well. */
11239 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11241 error ("using template type parameter %qT after %qs",
11242 type, tag_name (tag_code));
11243 return error_mark_node;
11247 If the identifier resolves to a typedef-name or a template
11248 type-parameter, the elaborated-type-specifier is ill-formed.
11250 In other words, the only legitimate declaration to use in the
11251 elaborated type specifier is the implicit typedef created when
11252 the type is declared. */
11253 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11254 && !DECL_SELF_REFERENCE_P (decl)
11255 && tag_code != typename_type)
11257 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11258 error ("%q+D has a previous declaration here", decl);
11259 return error_mark_node;
11261 else if (TREE_CODE (type) != RECORD_TYPE
11262 && TREE_CODE (type) != UNION_TYPE
11263 && tag_code != enum_type
11264 && tag_code != typename_type)
11266 error ("%qT referred to as %qs", type, tag_name (tag_code));
11267 error ("%q+T has a previous declaration here", type);
11268 return error_mark_node;
11270 else if (TREE_CODE (type) != ENUMERAL_TYPE
11271 && tag_code == enum_type)
11273 error ("%qT referred to as enum", type);
11274 error ("%q+T has a previous declaration here", type);
11275 return error_mark_node;
11277 else if (!allow_template_p
11278 && TREE_CODE (type) == RECORD_TYPE
11279 && CLASSTYPE_IS_TEMPLATE (type))
11281 /* If a class template appears as elaborated type specifier
11282 without a template header such as:
11284 template <class T> class C {};
11285 void f(class C); // No template header here
11287 then the required template argument is missing. */
11288 error ("template argument required for %<%s %T%>",
11289 tag_name (tag_code),
11290 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11291 return error_mark_node;
11297 /* Lookup NAME in elaborate type specifier in scope according to
11298 SCOPE and issue diagnostics if necessary.
11299 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11300 found, and ERROR_MARK_NODE for type error. */
11303 lookup_and_check_tag (enum tag_types tag_code, tree name,
11304 tag_scope scope, bool template_header_p)
11308 if (scope == ts_global)
11310 /* First try ordinary name lookup, ignoring hidden class name
11311 injected via friend declaration. */
11312 decl = lookup_name_prefer_type (name, 2);
11313 /* If that fails, the name will be placed in the smallest
11314 non-class, non-function-prototype scope according to 3.3.1/5.
11315 We may already have a hidden name declared as friend in this
11316 scope. So lookup again but not ignoring hidden names.
11317 If we find one, that name will be made visible rather than
11318 creating a new tag. */
11320 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11323 decl = lookup_type_scope (name, scope);
11325 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11326 decl = DECL_TEMPLATE_RESULT (decl);
11328 if (decl && TREE_CODE (decl) == TYPE_DECL)
11330 /* Look for invalid nested type:
11334 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11336 error ("%qD has the same name as the class in which it is "
11339 return error_mark_node;
11342 /* Two cases we need to consider when deciding if a class
11343 template is allowed as an elaborated type specifier:
11344 1. It is a self reference to its own class.
11345 2. It comes with a template header.
11349 template <class T> class C {
11350 class C *c1; // DECL_SELF_REFERENCE_P is true
11353 template <class U> class C; // template_header_p is true
11354 template <class T> class C<T>::D {
11355 class C *c2; // DECL_SELF_REFERENCE_P is true
11358 t = check_elaborated_type_specifier (tag_code,
11361 | DECL_SELF_REFERENCE_P (decl));
11364 else if (decl && TREE_CODE (decl) == TREE_LIST)
11366 error ("reference to %qD is ambiguous", name);
11367 print_candidates (decl);
11368 return error_mark_node;
11374 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11375 Define the tag as a forward-reference if it is not defined.
11377 If a declaration is given, process it here, and report an error if
11378 multiple declarations are not identical.
11380 SCOPE is TS_CURRENT when this is also a definition. Only look in
11381 the current frame for the name (since C++ allows new names in any
11382 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11383 declaration. Only look beginning from the current scope outward up
11384 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11386 TEMPLATE_HEADER_P is true when this declaration is preceded by
11387 a set of template parameters. */
11390 xref_tag_1 (enum tag_types tag_code, tree name,
11391 tag_scope scope, bool template_header_p)
11393 enum tree_code code;
11395 tree context = NULL_TREE;
11397 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11403 code = RECORD_TYPE;
11409 code = ENUMERAL_TYPE;
11412 gcc_unreachable ();
11415 /* In case of anonymous name, xref_tag is only called to
11416 make type node and push name. Name lookup is not required. */
11417 if (ANON_AGGRNAME_P (name))
11420 t = lookup_and_check_tag (tag_code, name,
11421 scope, template_header_p);
11423 if (t == error_mark_node)
11424 return error_mark_node;
11426 if (scope != ts_current && t && current_class_type
11427 && template_class_depth (current_class_type)
11428 && template_header_p)
11430 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11431 definition of this tag. Since, in addition, we are currently
11432 processing a (member) template declaration of a template
11433 class, we must be very careful; consider:
11440 { template <class V>
11441 friend struct S1; };
11443 Here, the S2::S1 declaration should not be confused with the
11444 outer declaration. In particular, the inner version should
11445 have a template parameter of level 2, not level 1. This
11446 would be particularly important if the member declaration
11449 template <class V = U> friend struct S1;
11451 say, when we should tsubst into `U' when instantiating
11452 S2. On the other hand, when presented with:
11462 we must find the inner binding eventually. We
11463 accomplish this by making sure that the new type we
11464 create to represent this declaration has the right
11466 context = TYPE_CONTEXT (t);
11472 /* If no such tag is yet defined, create a forward-reference node
11473 and record it as the "definition".
11474 When a real declaration of this type is found,
11475 the forward-reference will be altered into a real type. */
11476 if (code == ENUMERAL_TYPE)
11478 error ("use of enum %q#D without previous declaration", name);
11479 return error_mark_node;
11483 t = make_class_type (code);
11484 TYPE_CONTEXT (t) = context;
11485 t = pushtag (name, t, scope);
11490 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11492 if (!redeclare_class_template (t, current_template_parms))
11493 return error_mark_node;
11495 else if (!processing_template_decl
11496 && CLASS_TYPE_P (t)
11497 && CLASSTYPE_IS_TEMPLATE (t))
11499 error ("redeclaration of %qT as a non-template", t);
11500 error ("previous declaration %q+D", t);
11501 return error_mark_node;
11504 /* Make injected friend class visible. */
11505 if (scope != ts_within_enclosing_non_class
11506 && hidden_name_p (TYPE_NAME (t)))
11508 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11509 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11511 if (TYPE_TEMPLATE_INFO (t))
11513 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11514 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11522 /* Wrapper for xref_tag_1. */
11525 xref_tag (enum tag_types tag_code, tree name,
11526 tag_scope scope, bool template_header_p)
11529 timevar_start (TV_NAME_LOOKUP);
11530 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11531 timevar_stop (TV_NAME_LOOKUP);
11537 xref_tag_from_type (tree old, tree id, tag_scope scope)
11539 enum tag_types tag_kind;
11541 if (TREE_CODE (old) == RECORD_TYPE)
11542 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11544 tag_kind = union_type;
11546 if (id == NULL_TREE)
11547 id = TYPE_IDENTIFIER (old);
11549 return xref_tag (tag_kind, id, scope, false);
11552 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11553 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11554 access_* node, and the TREE_VALUE is the type of the base-class.
11555 Non-NULL TREE_TYPE indicates virtual inheritance.
11557 Returns true if the binfo hierarchy was successfully created,
11558 false if an error was detected. */
11561 xref_basetypes (tree ref, tree base_list)
11564 tree binfo, base_binfo;
11565 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11566 unsigned max_bases = 0; /* Maximum direct bases. */
11568 tree default_access;
11569 tree igo_prev; /* Track Inheritance Graph Order. */
11571 if (ref == error_mark_node)
11574 /* The base of a derived class is private by default, all others are
11576 default_access = (TREE_CODE (ref) == RECORD_TYPE
11577 && CLASSTYPE_DECLARED_CLASS (ref)
11578 ? access_private_node : access_public_node);
11580 /* First, make sure that any templates in base-classes are
11581 instantiated. This ensures that if we call ourselves recursively
11582 we do not get confused about which classes are marked and which
11584 basep = &base_list;
11587 tree basetype = TREE_VALUE (*basep);
11589 if (!(processing_template_decl && uses_template_parms (basetype))
11590 && !complete_type_or_else (basetype, NULL))
11591 /* An incomplete type. Remove it from the list. */
11592 *basep = TREE_CHAIN (*basep);
11596 if (TREE_TYPE (*basep))
11598 if (CLASS_TYPE_P (basetype))
11599 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11600 basep = &TREE_CHAIN (*basep);
11604 TYPE_MARKED_P (ref) = 1;
11606 /* The binfo slot should be empty, unless this is an (ill-formed)
11608 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11610 error ("redefinition of %q#T", ref);
11614 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11616 binfo = make_tree_binfo (max_bases);
11618 TYPE_BINFO (ref) = binfo;
11619 BINFO_OFFSET (binfo) = size_zero_node;
11620 BINFO_TYPE (binfo) = ref;
11622 /* Apply base-class info set up to the variants of this type. */
11623 fixup_type_variants (ref);
11627 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11628 /* An aggregate cannot have baseclasses. */
11629 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11631 if (TREE_CODE (ref) == UNION_TYPE)
11633 error ("derived union %qT invalid", ref);
11640 if (TYPE_FOR_JAVA (ref))
11642 error ("Java class %qT cannot have multiple bases", ref);
11649 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11651 if (TYPE_FOR_JAVA (ref))
11653 error ("Java class %qT cannot have virtual bases", ref);
11658 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11660 tree access = TREE_PURPOSE (base_list);
11661 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11662 tree basetype = TREE_VALUE (base_list);
11664 if (access == access_default_node)
11665 access = default_access;
11667 if (PACK_EXPANSION_P (basetype))
11668 basetype = PACK_EXPANSION_PATTERN (basetype);
11669 if (TREE_CODE (basetype) == TYPE_DECL)
11670 basetype = TREE_TYPE (basetype);
11671 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11673 error ("base type %qT fails to be a struct or class type",
11678 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11679 TYPE_FOR_JAVA (ref) = 1;
11681 base_binfo = NULL_TREE;
11682 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11684 base_binfo = TYPE_BINFO (basetype);
11685 /* The original basetype could have been a typedef'd type. */
11686 basetype = BINFO_TYPE (base_binfo);
11688 /* Inherit flags from the base. */
11689 TYPE_HAS_NEW_OPERATOR (ref)
11690 |= TYPE_HAS_NEW_OPERATOR (basetype);
11691 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11692 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11693 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11694 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11695 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11696 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11697 CLASSTYPE_REPEATED_BASE_P (ref)
11698 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11701 /* We must do this test after we've seen through a typedef
11703 if (TYPE_MARKED_P (basetype))
11705 if (basetype == ref)
11706 error ("recursive type %qT undefined", basetype);
11708 error ("duplicate base type %qT invalid", basetype);
11712 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11713 /* Regenerate the pack expansion for the bases. */
11714 basetype = make_pack_expansion (basetype);
11716 TYPE_MARKED_P (basetype) = 1;
11718 base_binfo = copy_binfo (base_binfo, basetype, ref,
11719 &igo_prev, via_virtual);
11720 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11721 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11723 BINFO_BASE_APPEND (binfo, base_binfo);
11724 BINFO_BASE_ACCESS_APPEND (binfo, access);
11727 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11728 /* If we have space in the vbase vector, we must have shared at
11729 least one of them, and are therefore diamond shaped. */
11730 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11732 /* Unmark all the types. */
11733 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11734 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11735 TYPE_MARKED_P (ref) = 0;
11737 /* Now see if we have a repeated base type. */
11738 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11740 for (base_binfo = binfo; base_binfo;
11741 base_binfo = TREE_CHAIN (base_binfo))
11743 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11745 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11748 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11750 for (base_binfo = binfo; base_binfo;
11751 base_binfo = TREE_CHAIN (base_binfo))
11752 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11753 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11762 /* Copies the enum-related properties from type SRC to type DST.
11763 Used with the underlying type of an enum and the enum itself. */
11765 copy_type_enum (tree dst, tree src)
11767 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11768 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11769 TYPE_SIZE (dst) = TYPE_SIZE (src);
11770 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11771 SET_TYPE_MODE (dst, TYPE_MODE (src));
11772 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11773 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11774 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11775 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11778 /* Begin compiling the definition of an enumeration type.
11781 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11783 UNDERLYING_TYPE is the type that will be used as the storage for
11784 the enumeration type. This should be NULL_TREE if no storage type
11787 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11789 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11791 Returns the type object, as yet incomplete.
11792 Also records info about it so that build_enumerator
11793 may be used to declare the individual values as they are read. */
11796 start_enum (tree name, tree enumtype, tree underlying_type,
11797 bool scoped_enum_p, bool *is_new)
11799 tree prevtype = NULL_TREE;
11800 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11804 /* [C++0x dcl.enum]p5:
11806 If not explicitly specified, the underlying type of a scoped
11807 enumeration type is int. */
11808 if (!underlying_type && scoped_enum_p)
11809 underlying_type = integer_type_node;
11811 if (underlying_type)
11812 underlying_type = cv_unqualified (underlying_type);
11814 /* If this is the real definition for a previous forward reference,
11815 fill in the contents in the same object that used to be the
11816 forward reference. */
11818 enumtype = lookup_and_check_tag (enum_type, name,
11819 /*tag_scope=*/ts_current,
11820 /*template_header_p=*/false);
11822 /* In case of a template_decl, the only check that should be deferred
11823 to instantiation time is the comparison of underlying types. */
11824 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11826 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11828 error_at (input_location, "scoped/unscoped mismatch "
11829 "in enum %q#T", enumtype);
11830 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11831 "previous definition here");
11832 enumtype = error_mark_node;
11834 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11836 error_at (input_location, "underlying type mismatch "
11837 "in enum %q#T", enumtype);
11838 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11839 "previous definition here");
11840 enumtype = error_mark_node;
11842 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11843 && !dependent_type_p (underlying_type)
11844 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11845 && !same_type_p (underlying_type,
11846 ENUM_UNDERLYING_TYPE (enumtype)))
11848 error_at (input_location, "different underlying type "
11849 "in enum %q#T", enumtype);
11850 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11851 "previous definition here");
11852 underlying_type = NULL_TREE;
11856 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11857 || processing_template_decl)
11859 /* In case of error, make a dummy enum to allow parsing to
11861 if (enumtype == error_mark_node)
11863 name = make_anon_name ();
11864 enumtype = NULL_TREE;
11867 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11868 of an opaque enum, or an opaque enum of an already defined
11869 enumeration (C++0x only).
11870 In any other case, it'll be NULL_TREE. */
11876 prevtype = enumtype;
11877 enumtype = cxx_make_type (ENUMERAL_TYPE);
11878 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11879 if (enumtype == error_mark_node)
11880 return error_mark_node;
11882 /* The enum is considered opaque until the opening '{' of the
11883 enumerator list. */
11884 SET_OPAQUE_ENUM_P (enumtype, true);
11885 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11888 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11890 if (underlying_type)
11892 if (CP_INTEGRAL_TYPE_P (underlying_type))
11894 copy_type_enum (enumtype, underlying_type);
11895 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11897 else if (dependent_type_p (underlying_type))
11898 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11900 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11901 underlying_type, enumtype);
11904 /* If into a template class, the returned enum is always the first
11905 declaration (opaque or not) seen. This way all the references to
11906 this type will be to the same declaration. The following ones are used
11907 only to check for definition errors. */
11908 if (prevtype && processing_template_decl)
11914 /* After processing and defining all the values of an enumeration type,
11915 install their decls in the enumeration type.
11916 ENUMTYPE is the type object. */
11919 finish_enum_value_list (tree enumtype)
11922 tree underlying_type;
11925 tree minnode, maxnode;
11928 bool fixed_underlying_type_p
11929 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11931 /* We built up the VALUES in reverse order. */
11932 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11934 /* For an enum defined in a template, just set the type of the values;
11935 all further processing is postponed until the template is
11936 instantiated. We need to set the type so that tsubst of a CONST_DECL
11938 if (processing_template_decl)
11940 for (values = TYPE_VALUES (enumtype);
11942 values = TREE_CHAIN (values))
11943 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11947 /* Determine the minimum and maximum values of the enumerators. */
11948 if (TYPE_VALUES (enumtype))
11950 minnode = maxnode = NULL_TREE;
11952 for (values = TYPE_VALUES (enumtype);
11954 values = TREE_CHAIN (values))
11956 decl = TREE_VALUE (values);
11958 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11959 each enumerator has the type of its enumeration. Prior to the
11960 closing brace, the type of each enumerator is the type of its
11961 initializing value. */
11962 TREE_TYPE (decl) = enumtype;
11964 /* Update the minimum and maximum values, if appropriate. */
11965 value = DECL_INITIAL (decl);
11966 if (value == error_mark_node)
11967 value = integer_zero_node;
11968 /* Figure out what the minimum and maximum values of the
11969 enumerators are. */
11971 minnode = maxnode = value;
11972 else if (tree_int_cst_lt (maxnode, value))
11974 else if (tree_int_cst_lt (value, minnode))
11981 If the enumerator-list is empty, the underlying type is as if
11982 the enumeration had a single enumerator with value 0. */
11983 minnode = maxnode = integer_zero_node;
11985 if (!fixed_underlying_type_p)
11987 /* Compute the number of bits require to represent all values of the
11988 enumeration. We must do this before the type of MINNODE and
11989 MAXNODE are transformed, since tree_int_cst_min_precision relies
11990 on the TREE_TYPE of the value it is passed. */
11991 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11992 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11993 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11994 int precision = MAX (lowprec, highprec);
11996 bool use_short_enum;
11998 /* Determine the underlying type of the enumeration.
12002 The underlying type of an enumeration is an integral type that
12003 can represent all the enumerator values defined in the
12004 enumeration. It is implementation-defined which integral type is
12005 used as the underlying type for an enumeration except that the
12006 underlying type shall not be larger than int unless the value of
12007 an enumerator cannot fit in an int or unsigned int.
12009 We use "int" or an "unsigned int" as the underlying type, even if
12010 a smaller integral type would work, unless the user has
12011 explicitly requested that we use the smallest possible type. The
12012 user can request that for all enumerations with a command line
12013 flag, or for just one enumeration with an attribute. */
12015 use_short_enum = flag_short_enums
12016 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12018 for (itk = (use_short_enum ? itk_char : itk_int);
12022 underlying_type = integer_types[itk];
12023 if (underlying_type != NULL_TREE
12024 && TYPE_PRECISION (underlying_type) >= precision
12025 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12028 if (itk == itk_none)
12032 IF no integral type can represent all the enumerator values, the
12033 enumeration is ill-formed. */
12034 error ("no integral type can represent all of the enumerator values "
12035 "for %qT", enumtype);
12036 precision = TYPE_PRECISION (long_long_integer_type_node);
12037 underlying_type = integer_types[itk_unsigned_long_long];
12042 The value of sizeof() applied to an enumeration type, an object
12043 of an enumeration type, or an enumerator, is the value of sizeof()
12044 applied to the underlying type. */
12045 copy_type_enum (enumtype, underlying_type);
12047 /* Compute the minimum and maximum values for the type.
12051 For an enumeration where emin is the smallest enumerator and emax
12052 is the largest, the values of the enumeration are the values of the
12053 underlying type in the range bmin to bmax, where bmin and bmax are,
12054 respectively, the smallest and largest values of the smallest bit-
12055 field that can store emin and emax. */
12057 /* The middle-end currently assumes that types with TYPE_PRECISION
12058 narrower than their underlying type are suitably zero or sign
12059 extended to fill their mode. Similarly, it assumes that the front
12060 end assures that a value of a particular type must be within
12061 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12063 We used to set these fields based on bmin and bmax, but that led
12064 to invalid assumptions like optimizing away bounds checking. So
12065 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12066 TYPE_MAX_VALUE to the values for the mode above and only restrict
12067 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12068 ENUM_UNDERLYING_TYPE (enumtype)
12069 = build_distinct_type_copy (underlying_type);
12070 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12071 set_min_and_max_values_for_integral_type
12072 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12074 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12075 if (flag_strict_enums)
12076 set_min_and_max_values_for_integral_type (enumtype, precision,
12080 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12082 /* Convert each of the enumerators to the type of the underlying
12083 type of the enumeration. */
12084 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12086 location_t saved_location;
12088 decl = TREE_VALUE (values);
12089 saved_location = input_location;
12090 input_location = DECL_SOURCE_LOCATION (decl);
12091 if (fixed_underlying_type_p)
12092 /* If the enumeration type has a fixed underlying type, we
12093 already checked all of the enumerator values. */
12094 value = DECL_INITIAL (decl);
12096 value = perform_implicit_conversion (underlying_type,
12097 DECL_INITIAL (decl),
12098 tf_warning_or_error);
12099 input_location = saved_location;
12101 /* Do not clobber shared ints. */
12102 value = copy_node (value);
12104 TREE_TYPE (value) = enumtype;
12105 DECL_INITIAL (decl) = value;
12108 /* Fix up all variant types of this enum type. */
12109 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12110 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12112 /* Finish debugging output for this type. */
12113 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12116 /* Finishes the enum type. This is called only the first time an
12117 enumeration is seen, be it opaque or odinary.
12118 ENUMTYPE is the type object. */
12121 finish_enum (tree enumtype)
12123 if (processing_template_decl)
12125 if (at_function_scope_p ())
12126 add_stmt (build_min (TAG_DEFN, enumtype));
12130 /* Here there should not be any variants of this type. */
12131 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12132 && !TYPE_NEXT_VARIANT (enumtype));
12135 /* Build and install a CONST_DECL for an enumeration constant of the
12136 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12137 LOC is the location of NAME.
12138 Assignment of sequential values by default is handled here. */
12141 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12147 /* If the VALUE was erroneous, pretend it wasn't there; that will
12148 result in the enum being assigned the next value in sequence. */
12149 if (value == error_mark_node)
12152 /* Remove no-op casts from the value. */
12154 STRIP_TYPE_NOPS (value);
12156 if (! processing_template_decl)
12158 /* Validate and default VALUE. */
12159 if (value != NULL_TREE)
12161 value = cxx_constant_value (value);
12163 if (TREE_CODE (value) == INTEGER_CST
12164 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12166 value = perform_integral_promotions (value);
12170 error ("enumerator value for %qD is not an integer constant", name);
12175 /* Default based on previous value. */
12176 if (value == NULL_TREE)
12178 if (TYPE_VALUES (enumtype))
12181 unsigned HOST_WIDE_INT lo;
12185 /* C++03 7.2/4: If no initializer is specified for the first
12186 enumerator, the type is an unspecified integral
12187 type. Otherwise the type is the same as the type of the
12188 initializing value of the preceding enumerator unless the
12189 incremented value is not representable in that type, in
12190 which case the type is an unspecified integral type
12191 sufficient to contain the incremented value. */
12192 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12193 if (error_operand_p (prev_value))
12194 value = error_mark_node;
12197 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12198 TREE_INT_CST_HIGH (prev_value),
12203 tree type = TREE_TYPE (prev_value);
12204 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12205 di.low = lo; di.high = hi;
12206 if (!double_int_fits_to_tree_p (type, di))
12209 for (itk = itk_int; itk != itk_none; itk++)
12211 type = integer_types[itk];
12212 if (type != NULL_TREE
12213 && (pos || !TYPE_UNSIGNED (type))
12214 && double_int_fits_to_tree_p (type, di))
12217 if (type && cxx_dialect < cxx0x
12218 && itk > itk_unsigned_long)
12219 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12220 incremented enumerator value is too large for %<unsigned long%>" : "\
12221 incremented enumerator value is too large for %<long%>");
12223 if (type == NULL_TREE)
12226 value = double_int_to_tree (type, di);
12231 error ("overflow in enumeration values at %qD", name);
12232 value = error_mark_node;
12237 value = integer_zero_node;
12240 /* Remove no-op casts from the value. */
12241 STRIP_TYPE_NOPS (value);
12243 /* If the underlying type of the enum is fixed, check whether
12244 the enumerator values fits in the underlying type. If it
12245 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12246 if (ENUM_UNDERLYING_TYPE (enumtype)
12248 && TREE_CODE (value) == INTEGER_CST
12249 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12251 error ("enumerator value %E is too large for underlying type %<%T%>",
12252 value, ENUM_UNDERLYING_TYPE (enumtype));
12254 /* Silently convert the value so that we can continue. */
12255 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12260 /* C++ associates enums with global, function, or class declarations. */
12261 context = current_scope ();
12263 /* Build the actual enumeration constant. Note that the enumeration
12264 constants have the underlying type of the enum (if it is fixed)
12265 or the type of their initializer (if the underlying type of the
12266 enum is not fixed):
12270 If the underlying type is fixed, the type of each enumerator
12271 prior to the closing brace is the underlying type; if the
12272 initializing value of an enumerator cannot be represented by
12273 the underlying type, the program is ill-formed. If the
12274 underlying type is not fixed, the type of each enumerator is
12275 the type of its initializing value.
12277 If the underlying type is not fixed, it will be computed by
12278 finish_enum and we will reset the type of this enumerator. Of
12279 course, if we're processing a template, there may be no value. */
12280 type = value ? TREE_TYPE (value) : NULL_TREE;
12282 if (context && context == current_class_type)
12283 /* This enum declaration is local to the class. We need the full
12284 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12285 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12287 /* It's a global enum, or it's local to a function. (Note local to
12288 a function could mean local to a class method. */
12289 decl = build_decl (loc, CONST_DECL, name, type);
12291 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12292 TREE_CONSTANT (decl) = 1;
12293 TREE_READONLY (decl) = 1;
12294 DECL_INITIAL (decl) = value;
12296 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12297 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12298 on the TYPE_FIELDS list for `S'. (That's so that you can say
12299 things like `S::i' later.) */
12300 finish_member_declaration (decl);
12304 /* Add this enumeration constant to the list for this type. */
12305 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12308 /* Look for an enumerator with the given NAME within the enumeration
12309 type ENUMTYPE. This routine is used primarily for qualified name
12310 lookup into an enumerator in C++0x, e.g.,
12312 enum class Color { Red, Green, Blue };
12314 Color color = Color::Red;
12316 Returns the value corresponding to the enumerator, or
12317 NULL_TREE if no such enumerator was found. */
12319 lookup_enumerator (tree enumtype, tree name)
12322 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12324 e = purpose_member (name, TYPE_VALUES (enumtype));
12325 return e? TREE_VALUE (e) : NULL_TREE;
12329 /* We're defining DECL. Make sure that its type is OK. */
12332 check_function_type (tree decl, tree current_function_parms)
12334 tree fntype = TREE_TYPE (decl);
12335 tree return_type = complete_type (TREE_TYPE (fntype));
12337 /* In a function definition, arg types must be complete. */
12338 require_complete_types_for_parms (current_function_parms);
12340 if (dependent_type_p (return_type))
12342 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12343 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12345 tree args = TYPE_ARG_TYPES (fntype);
12347 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12348 error ("return type %q#T is incomplete", return_type);
12350 error ("return type has Java class type %q#T", return_type);
12352 /* Make it return void instead. */
12353 if (TREE_CODE (fntype) == METHOD_TYPE)
12354 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12356 TREE_CHAIN (args));
12358 fntype = build_function_type (void_type_node, args);
12360 = build_exception_variant (fntype,
12361 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12362 fntype = (cp_build_type_attribute_variant
12363 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12364 TREE_TYPE (decl) = fntype;
12367 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12370 /* Create the FUNCTION_DECL for a function definition.
12371 DECLSPECS and DECLARATOR are the parts of the declaration;
12372 they describe the function's name and the type it returns,
12373 but twisted together in a fashion that parallels the syntax of C.
12375 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12376 DECLARATOR is really the DECL for the function we are about to
12377 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12378 indicating that the function is an inline defined in-class.
12380 This function creates a binding context for the function body
12381 as well as setting up the FUNCTION_DECL in current_function_decl.
12383 For C++, we must first check whether that datum makes any sense.
12384 For example, "class A local_a(1,2);" means that variable local_a
12385 is an aggregate of type A, which should have a constructor
12386 applied to it with the argument list [1, 2].
12388 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12389 or may be a BLOCK if the function has been defined previously
12390 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12391 error_mark_node if the function has never been defined, or
12392 a BLOCK if the function has been defined somewhere. */
12395 start_preparsed_function (tree decl1, tree attrs, int flags)
12397 tree ctype = NULL_TREE;
12400 int doing_friend = 0;
12401 struct cp_binding_level *bl;
12402 tree current_function_parms;
12403 struct c_fileinfo *finfo
12404 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12405 bool honor_interface;
12407 /* Sanity check. */
12408 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12409 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12411 fntype = TREE_TYPE (decl1);
12412 if (TREE_CODE (fntype) == METHOD_TYPE)
12413 ctype = TYPE_METHOD_BASETYPE (fntype);
12415 /* ISO C++ 11.4/5. A friend function defined in a class is in
12416 the (lexical) scope of the class in which it is defined. */
12417 if (!ctype && DECL_FRIEND_P (decl1))
12419 ctype = DECL_FRIEND_CONTEXT (decl1);
12421 /* CTYPE could be null here if we're dealing with a template;
12422 for example, `inline friend float foo()' inside a template
12423 will have no CTYPE set. */
12424 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12430 if (DECL_DECLARED_INLINE_P (decl1)
12431 && lookup_attribute ("noinline", attrs))
12432 warning (0, "inline function %q+D given attribute noinline", decl1);
12434 /* Handle gnu_inline attribute. */
12435 if (GNU_INLINE_P (decl1))
12437 DECL_EXTERNAL (decl1) = 1;
12438 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12439 DECL_INTERFACE_KNOWN (decl1) = 1;
12440 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12443 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12444 /* This is a constructor, we must ensure that any default args
12445 introduced by this definition are propagated to the clones
12446 now. The clones are used directly in overload resolution. */
12447 adjust_clone_args (decl1);
12449 /* Sometimes we don't notice that a function is a static member, and
12450 build a METHOD_TYPE for it. Fix that up now. */
12451 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12452 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12454 /* Set up current_class_type, and enter the scope of the class, if
12457 push_nested_class (ctype);
12458 else if (DECL_STATIC_FUNCTION_P (decl1))
12459 push_nested_class (DECL_CONTEXT (decl1));
12461 /* Now that we have entered the scope of the class, we must restore
12462 the bindings for any template parameters surrounding DECL1, if it
12463 is an inline member template. (Order is important; consider the
12464 case where a template parameter has the same name as a field of
12465 the class.) It is not until after this point that
12466 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12467 if (flags & SF_INCLASS_INLINE)
12468 maybe_begin_member_template_processing (decl1);
12470 /* Effective C++ rule 15. */
12472 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12473 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12474 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12476 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12477 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12478 if (!DECL_INITIAL (decl1))
12479 DECL_INITIAL (decl1) = error_mark_node;
12481 /* This function exists in static storage.
12482 (This does not mean `static' in the C sense!) */
12483 TREE_STATIC (decl1) = 1;
12485 /* We must call push_template_decl after current_class_type is set
12486 up. (If we are processing inline definitions after exiting a
12487 class scope, current_class_type will be NULL_TREE until set above
12488 by push_nested_class.) */
12489 if (processing_template_decl)
12491 /* FIXME: Handle error_mark_node more gracefully. */
12492 tree newdecl1 = push_template_decl (decl1);
12493 if (newdecl1 != error_mark_node)
12497 /* We are now in the scope of the function being defined. */
12498 current_function_decl = decl1;
12500 /* Save the parm names or decls from this function's declarator
12501 where store_parm_decls will find them. */
12502 current_function_parms = DECL_ARGUMENTS (decl1);
12504 /* Make sure the parameter and return types are reasonable. When
12505 you declare a function, these types can be incomplete, but they
12506 must be complete when you define the function. */
12507 check_function_type (decl1, current_function_parms);
12509 /* Build the return declaration for the function. */
12510 restype = TREE_TYPE (fntype);
12511 if (DECL_RESULT (decl1) == NULL_TREE)
12515 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12516 DECL_ARTIFICIAL (resdecl) = 1;
12517 DECL_IGNORED_P (resdecl) = 1;
12518 DECL_RESULT (decl1) = resdecl;
12520 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12523 /* Let the user know we're compiling this function. */
12524 announce_function (decl1);
12526 /* Record the decl so that the function name is defined.
12527 If we already have a decl for this name, and it is a FUNCTION_DECL,
12528 use the old decl. */
12529 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12531 /* A specialization is not used to guide overload resolution. */
12532 if (!DECL_FUNCTION_MEMBER_P (decl1)
12533 && !(DECL_USE_TEMPLATE (decl1) &&
12534 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12536 tree olddecl = pushdecl (decl1);
12538 if (olddecl == error_mark_node)
12539 /* If something went wrong when registering the declaration,
12540 use DECL1; we have to have a FUNCTION_DECL to use when
12541 parsing the body of the function. */
12545 /* Otherwise, OLDDECL is either a previous declaration
12546 of the same function or DECL1 itself. */
12548 if (warn_missing_declarations
12549 && olddecl == decl1
12550 && !DECL_MAIN_P (decl1)
12551 && TREE_PUBLIC (decl1)
12552 && !DECL_DECLARED_INLINE_P (decl1))
12556 /* Check whether DECL1 is in an anonymous
12558 for (context = DECL_CONTEXT (decl1);
12560 context = DECL_CONTEXT (context))
12562 if (TREE_CODE (context) == NAMESPACE_DECL
12563 && DECL_NAME (context) == NULL_TREE)
12567 if (context == NULL)
12568 warning (OPT_Wmissing_declarations,
12569 "no previous declaration for %q+D", decl1);
12577 /* We need to set the DECL_CONTEXT. */
12578 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12579 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12581 fntype = TREE_TYPE (decl1);
12583 /* If #pragma weak applies, mark the decl appropriately now.
12584 The pragma only applies to global functions. Because
12585 determining whether or not the #pragma applies involves
12586 computing the mangled name for the declaration, we cannot
12587 apply the pragma until after we have merged this declaration
12588 with any previous declarations; if the original declaration
12589 has a linkage specification, that specification applies to
12590 the definition as well, and may affect the mangled name. */
12591 if (DECL_FILE_SCOPE_P (decl1))
12592 maybe_apply_pragma_weak (decl1);
12595 /* constexpr functions must have literal argument types and
12596 literal return type. */
12597 validate_constexpr_fundecl (decl1);
12599 /* Reset this in case the call to pushdecl changed it. */
12600 current_function_decl = decl1;
12602 gcc_assert (DECL_INITIAL (decl1));
12604 /* This function may already have been parsed, in which case just
12605 return; our caller will skip over the body without parsing. */
12606 if (DECL_INITIAL (decl1) != error_mark_node)
12609 /* Initialize RTL machinery. We cannot do this until
12610 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12611 even when processing a template; this is how we get
12612 CFUN set up, and our per-function variables initialized.
12613 FIXME factor out the non-RTL stuff. */
12614 bl = current_binding_level;
12615 allocate_struct_function (decl1, processing_template_decl);
12617 /* Initialize the language data structures. Whenever we start
12618 a new function, we destroy temporaries in the usual way. */
12619 cfun->language = ggc_alloc_cleared_language_function ();
12620 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12621 current_binding_level = bl;
12623 /* Start the statement-tree, start the tree now. */
12624 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12626 /* If we are (erroneously) defining a function that we have already
12627 defined before, wipe out what we knew before. */
12628 if (!DECL_PENDING_INLINE_P (decl1))
12629 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12631 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12633 /* We know that this was set up by `grokclassfn'. We do not
12634 wait until `store_parm_decls', since evil parse errors may
12635 never get us to that point. Here we keep the consistency
12636 between `current_class_type' and `current_class_ptr'. */
12637 tree t = DECL_ARGUMENTS (decl1);
12639 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12640 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12642 cp_function_chain->x_current_class_ref
12643 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12644 cp_function_chain->x_current_class_ptr = t;
12646 /* Constructors and destructors need to know whether they're "in
12647 charge" of initializing virtual base classes. */
12648 t = DECL_CHAIN (t);
12649 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12651 current_in_charge_parm = t;
12652 t = DECL_CHAIN (t);
12654 if (DECL_HAS_VTT_PARM_P (decl1))
12656 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12657 current_vtt_parm = t;
12661 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12662 /* Implicitly-defined methods (like the
12663 destructor for a class in which no destructor
12664 is explicitly declared) must not be defined
12665 until their definition is needed. So, we
12666 ignore interface specifications for
12667 compiler-generated functions. */
12668 && !DECL_ARTIFICIAL (decl1));
12670 if (processing_template_decl)
12671 /* Don't mess with interface flags. */;
12672 else if (DECL_INTERFACE_KNOWN (decl1))
12674 tree ctx = decl_function_context (decl1);
12676 if (DECL_NOT_REALLY_EXTERN (decl1))
12677 DECL_EXTERNAL (decl1) = 0;
12679 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12680 && TREE_PUBLIC (ctx))
12681 /* This is a function in a local class in an extern inline
12683 comdat_linkage (decl1);
12685 /* If this function belongs to an interface, it is public.
12686 If it belongs to someone else's interface, it is also external.
12687 This only affects inlines and template instantiations. */
12688 else if (!finfo->interface_unknown && honor_interface)
12690 if (DECL_DECLARED_INLINE_P (decl1)
12691 || DECL_TEMPLATE_INSTANTIATION (decl1))
12693 DECL_EXTERNAL (decl1)
12694 = (finfo->interface_only
12695 || (DECL_DECLARED_INLINE_P (decl1)
12696 && ! flag_implement_inlines
12697 && !DECL_VINDEX (decl1)));
12699 /* For WIN32 we also want to put these in linkonce sections. */
12700 maybe_make_one_only (decl1);
12703 DECL_EXTERNAL (decl1) = 0;
12704 DECL_INTERFACE_KNOWN (decl1) = 1;
12705 /* If this function is in an interface implemented in this file,
12706 make sure that the back end knows to emit this function
12708 if (!DECL_EXTERNAL (decl1))
12709 mark_needed (decl1);
12711 else if (finfo->interface_unknown && finfo->interface_only
12712 && honor_interface)
12714 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12715 interface, we will have both finfo->interface_unknown and
12716 finfo->interface_only set. In that case, we don't want to
12717 use the normal heuristics because someone will supply a
12718 #pragma implementation elsewhere, and deducing it here would
12719 produce a conflict. */
12720 comdat_linkage (decl1);
12721 DECL_EXTERNAL (decl1) = 0;
12722 DECL_INTERFACE_KNOWN (decl1) = 1;
12723 DECL_DEFER_OUTPUT (decl1) = 1;
12727 /* This is a definition, not a reference.
12728 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12729 if (!GNU_INLINE_P (decl1))
12730 DECL_EXTERNAL (decl1) = 0;
12732 if ((DECL_DECLARED_INLINE_P (decl1)
12733 || DECL_TEMPLATE_INSTANTIATION (decl1))
12734 && ! DECL_INTERFACE_KNOWN (decl1))
12735 DECL_DEFER_OUTPUT (decl1) = 1;
12737 DECL_INTERFACE_KNOWN (decl1) = 1;
12740 /* Determine the ELF visibility attribute for the function. We must not
12741 do this before calling "pushdecl", as we must allow "duplicate_decls"
12742 to merge any attributes appropriately. We also need to wait until
12744 if (!DECL_CLONED_FUNCTION_P (decl1))
12745 determine_visibility (decl1);
12747 begin_scope (sk_function_parms, decl1);
12751 if (DECL_DESTRUCTOR_P (decl1)
12752 || (DECL_CONSTRUCTOR_P (decl1)
12753 && targetm.cxx.cdtor_returns_this ()))
12755 cdtor_label = build_decl (input_location,
12756 LABEL_DECL, NULL_TREE, NULL_TREE);
12757 DECL_CONTEXT (cdtor_label) = current_function_decl;
12760 start_fname_decls ();
12762 store_parm_decls (current_function_parms);
12766 /* Like start_preparsed_function, except that instead of a
12767 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12769 Returns 1 on success. If the DECLARATOR is not suitable for a function
12770 (it defines a datum instead), we return 0, which tells
12771 yyparse to report a parse error. */
12774 start_function (cp_decl_specifier_seq *declspecs,
12775 const cp_declarator *declarator,
12780 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12781 if (decl1 == error_mark_node)
12783 /* If the declarator is not suitable for a function definition,
12784 cause a syntax error. */
12785 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12787 error ("invalid function declaration");
12791 if (DECL_MAIN_P (decl1))
12792 /* main must return int. grokfndecl should have corrected it
12793 (and issued a diagnostic) if the user got it wrong. */
12794 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12795 integer_type_node));
12797 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12802 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12806 use_eh_spec_block (tree fn)
12808 return (flag_exceptions && flag_enforce_eh_specs
12809 && !processing_template_decl
12810 && !type_throw_all_p (TREE_TYPE (fn))
12811 /* We insert the EH_SPEC_BLOCK only in the original
12812 function; then, it is copied automatically to the
12814 && !DECL_CLONED_FUNCTION_P (fn)
12815 /* Implicitly-generated constructors and destructors have
12816 exception specifications. However, those specifications
12817 are the union of the possible exceptions specified by the
12818 constructors/destructors for bases and members, so no
12819 unallowed exception will ever reach this function. By
12820 not creating the EH_SPEC_BLOCK we save a little memory,
12821 and we avoid spurious warnings about unreachable
12823 && !DECL_DEFAULTED_FN (fn));
12826 /* Store the parameter declarations into the current function declaration.
12827 This is called after parsing the parameter declarations, before
12828 digesting the body of the function.
12830 Also install to binding contour return value identifier, if any. */
12833 store_parm_decls (tree current_function_parms)
12835 tree fndecl = current_function_decl;
12838 /* This is a chain of any other decls that came in among the parm
12839 declarations. If a parm is declared with enum {foo, bar} x;
12840 then CONST_DECLs for foo and bar are put here. */
12841 tree nonparms = NULL_TREE;
12843 if (current_function_parms)
12845 /* This case is when the function was defined with an ANSI prototype.
12846 The parms already have decls, so we need not do anything here
12847 except record them as in effect
12848 and complain if any redundant old-style parm decls were written. */
12850 tree specparms = current_function_parms;
12853 /* Must clear this because it might contain TYPE_DECLs declared
12855 current_binding_level->names = NULL;
12857 /* If we're doing semantic analysis, then we'll call pushdecl
12858 for each of these. We must do them in reverse order so that
12859 they end in the correct forward order. */
12860 specparms = nreverse (specparms);
12862 for (parm = specparms; parm; parm = next)
12864 next = DECL_CHAIN (parm);
12865 if (TREE_CODE (parm) == PARM_DECL)
12867 if (DECL_NAME (parm) == NULL_TREE
12868 || TREE_CODE (parm) != VOID_TYPE)
12871 error ("parameter %qD declared void", parm);
12875 /* If we find an enum constant or a type tag,
12876 put it aside for the moment. */
12877 TREE_CHAIN (parm) = NULL_TREE;
12878 nonparms = chainon (nonparms, parm);
12882 /* Get the decls in their original chain order and record in the
12883 function. This is all and only the PARM_DECLs that were
12884 pushed into scope by the loop above. */
12885 DECL_ARGUMENTS (fndecl) = getdecls ();
12888 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12890 /* Now store the final chain of decls for the arguments
12891 as the decl-chain of the current lexical scope.
12892 Put the enumerators in as well, at the front so that
12893 DECL_ARGUMENTS is not modified. */
12894 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12896 if (use_eh_spec_block (current_function_decl))
12897 current_eh_spec_block = begin_eh_spec_block ();
12901 /* We have finished doing semantic analysis on DECL, but have not yet
12902 generated RTL for its body. Save away our current state, so that
12903 when we want to generate RTL later we know what to do. */
12906 save_function_data (tree decl)
12908 struct language_function *f;
12910 /* Save the language-specific per-function data so that we can
12911 get it back when we really expand this function. */
12912 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12915 f = ggc_alloc_language_function ();
12916 memcpy (f, cp_function_chain, sizeof (struct language_function));
12917 DECL_SAVED_FUNCTION_DATA (decl) = f;
12919 /* Clear out the bits we don't need. */
12920 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12921 f->bindings = NULL;
12922 f->x_local_names = NULL;
12926 /* Set the return value of the constructor (if present). */
12929 finish_constructor_body (void)
12934 if (targetm.cxx.cdtor_returns_this ()
12935 && (! TYPE_FOR_JAVA (current_class_type)))
12937 /* Any return from a constructor will end up here. */
12938 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12940 val = DECL_ARGUMENTS (current_function_decl);
12941 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12942 DECL_RESULT (current_function_decl), val);
12943 /* Return the address of the object. */
12944 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12945 add_stmt (exprstmt);
12949 /* Do all the processing for the beginning of a destructor; set up the
12950 vtable pointers and cleanups for bases and members. */
12953 begin_destructor_body (void)
12955 tree compound_stmt;
12957 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12958 issued an error message. We still want to try to process the
12959 body of the function, but initialize_vtbl_ptrs will crash if
12960 TYPE_BINFO is NULL. */
12961 if (COMPLETE_TYPE_P (current_class_type))
12963 compound_stmt = begin_compound_stmt (0);
12964 /* Make all virtual function table pointers in non-virtual base
12965 classes point to CURRENT_CLASS_TYPE's virtual function
12967 initialize_vtbl_ptrs (current_class_ptr);
12968 finish_compound_stmt (compound_stmt);
12970 /* And insert cleanups for our bases and members so that they
12971 will be properly destroyed if we throw. */
12972 push_base_cleanups ();
12976 /* At the end of every destructor we generate code to delete the object if
12977 necessary. Do that now. */
12980 finish_destructor_body (void)
12984 /* Any return from a destructor will end up here; that way all base
12985 and member cleanups will be run when the function returns. */
12986 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12988 /* In a virtual destructor, we must call delete. */
12989 if (DECL_VIRTUAL_P (current_function_decl))
12992 tree virtual_size = cxx_sizeof (current_class_type);
12996 At the point of definition of a virtual destructor (including
12997 an implicit definition), non-placement operator delete shall
12998 be looked up in the scope of the destructor's class and if
12999 found shall be accessible and unambiguous. */
13000 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13002 /*global_p=*/false,
13003 /*placement=*/NULL_TREE,
13004 /*alloc_fn=*/NULL_TREE);
13006 if_stmt = begin_if_stmt ();
13007 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13008 current_in_charge_parm,
13011 finish_expr_stmt (exprstmt);
13012 finish_then_clause (if_stmt);
13013 finish_if_stmt (if_stmt);
13016 if (targetm.cxx.cdtor_returns_this ())
13020 val = DECL_ARGUMENTS (current_function_decl);
13021 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13022 DECL_RESULT (current_function_decl), val);
13023 /* Return the address of the object. */
13024 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13025 add_stmt (exprstmt);
13029 /* Do the necessary processing for the beginning of a function body, which
13030 in this case includes member-initializers, but not the catch clauses of
13031 a function-try-block. Currently, this means opening a binding level
13032 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
13035 begin_function_body (void)
13039 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13042 if (processing_template_decl)
13043 /* Do nothing now. */;
13045 /* Always keep the BLOCK node associated with the outermost pair of
13046 curly braces of a function. These are needed for correct
13047 operation of dwarfout.c. */
13048 keep_next_level (true);
13050 stmt = begin_compound_stmt (BCS_FN_BODY);
13052 if (processing_template_decl)
13053 /* Do nothing now. */;
13054 else if (DECL_DESTRUCTOR_P (current_function_decl))
13055 begin_destructor_body ();
13060 /* Do the processing for the end of a function body. Currently, this means
13061 closing out the cleanups for fully-constructed bases and members, and in
13062 the case of the destructor, deleting the object if desired. Again, this
13063 is only meaningful for [cd]tors, since they are the only functions where
13064 there is a significant distinction between the main body and any
13065 function catch clauses. Handling, say, main() return semantics here
13066 would be wrong, as flowing off the end of a function catch clause for
13067 main() would also need to return 0. */
13070 finish_function_body (tree compstmt)
13072 if (compstmt == NULL_TREE)
13075 /* Close the block. */
13076 finish_compound_stmt (compstmt);
13078 if (processing_template_decl)
13079 /* Do nothing now. */;
13080 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13081 finish_constructor_body ();
13082 else if (DECL_DESTRUCTOR_P (current_function_decl))
13083 finish_destructor_body ();
13086 /* Given a function, returns the BLOCK corresponding to the outermost level
13087 of curly braces, skipping the artificial block created for constructor
13091 outer_curly_brace_block (tree fndecl)
13093 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13094 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13095 /* Skip the artificial function body block. */
13096 block = BLOCK_SUBBLOCKS (block);
13100 /* If FNDECL is a class's key method, add the class to the list of
13101 keyed classes that should be emitted. */
13104 record_key_method_defined (tree fndecl)
13106 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13107 && DECL_VIRTUAL_P (fndecl)
13108 && !processing_template_decl)
13110 tree fnclass = DECL_CONTEXT (fndecl);
13111 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13112 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13116 /* Subroutine of finish_function.
13117 Save the body of constexpr functions for possible
13118 future compile time evaluation. */
13121 maybe_save_function_definition (tree fun)
13123 if (!processing_template_decl
13124 && DECL_DECLARED_CONSTEXPR_P (fun)
13125 && !DECL_CLONED_FUNCTION_P (fun))
13126 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13129 /* Finish up a function declaration and compile that function
13130 all the way to assembler language output. The free the storage
13131 for the function definition.
13133 FLAGS is a bitwise or of the following values:
13135 We just finished processing the body of an in-class inline
13136 function definition. (This processing will have taken place
13137 after the class definition is complete.) */
13140 finish_function (int flags)
13142 tree fndecl = current_function_decl;
13143 tree fntype, ctype = NULL_TREE;
13144 int inclass_inline = (flags & 2) != 0;
13146 /* When we get some parse errors, we can end up without a
13147 current_function_decl, so cope. */
13148 if (fndecl == NULL_TREE)
13149 return error_mark_node;
13151 if (c_dialect_objc ())
13152 objc_finish_function ();
13154 gcc_assert (!defer_mark_used_calls);
13155 defer_mark_used_calls = true;
13157 record_key_method_defined (fndecl);
13159 fntype = TREE_TYPE (fndecl);
13161 /* TREE_READONLY (fndecl) = 1;
13162 This caused &foo to be of type ptr-to-const-function
13163 which then got a warning when stored in a ptr-to-function variable. */
13165 gcc_assert (building_stmt_list_p ());
13166 /* The current function is being defined, so its DECL_INITIAL should
13167 be set, and unless there's a multiple definition, it should be
13168 error_mark_node. */
13169 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13171 /* For a cloned function, we've already got all the code we need;
13172 there's no need to add any extra bits. */
13173 if (!DECL_CLONED_FUNCTION_P (fndecl))
13175 if (DECL_MAIN_P (current_function_decl))
13179 /* Make it so that `main' always returns 0 by default (or
13182 stmt = finish_return_stmt (integer_one_node);
13184 stmt = finish_return_stmt (integer_zero_node);
13186 /* Hack. We don't want the middle-end to warn that this
13187 return is unreachable, so put the statement on the
13190 location_t linezero = linemap_line_start (line_table, 0, 1);
13191 SET_EXPR_LOCATION (stmt, linezero);
13195 if (use_eh_spec_block (current_function_decl))
13196 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13197 (TREE_TYPE (current_function_decl)),
13198 current_eh_spec_block);
13201 /* If we're saving up tree structure, tie off the function now. */
13202 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13204 finish_fname_decls ();
13206 /* If this function can't throw any exceptions, remember that. */
13207 if (!processing_template_decl
13208 && !cp_function_chain->can_throw
13209 && !flag_non_call_exceptions
13210 && !decl_replaceable_p (fndecl))
13211 TREE_NOTHROW (fndecl) = 1;
13213 /* This must come after expand_function_end because cleanups might
13214 have declarations (from inline functions) that need to go into
13215 this function's blocks. */
13217 /* If the current binding level isn't the outermost binding level
13218 for this function, either there is a bug, or we have experienced
13219 syntax errors and the statement tree is malformed. */
13220 if (current_binding_level->kind != sk_function_parms)
13222 /* Make sure we have already experienced errors. */
13223 gcc_assert (errorcount);
13225 /* Throw away the broken statement tree and extra binding
13227 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13229 while (current_binding_level->kind != sk_function_parms)
13231 if (current_binding_level->kind == sk_class)
13232 pop_nested_class ();
13234 poplevel (0, 0, 0);
13237 poplevel (1, 0, 1);
13239 /* Statements should always be full-expressions at the outermost set
13240 of curly braces for a function. */
13241 gcc_assert (stmts_are_full_exprs_p ());
13243 /* Save constexpr function body before it gets munged by
13244 the NRV transformation. */
13245 maybe_save_function_definition (fndecl);
13247 /* Set up the named return value optimization, if we can. Candidate
13248 variables are selected in check_return_expr. */
13249 if (current_function_return_value)
13251 tree r = current_function_return_value;
13254 if (r != error_mark_node
13255 /* This is only worth doing for fns that return in memory--and
13256 simpler, since we don't have to worry about promoted modes. */
13257 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13258 /* Only allow this for variables declared in the outer scope of
13259 the function so we know that their lifetime always ends with a
13260 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13261 we were to do this optimization in tree-ssa. */
13262 && (outer = outer_curly_brace_block (fndecl))
13263 && chain_member (r, BLOCK_VARS (outer)))
13264 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13266 current_function_return_value = NULL_TREE;
13269 /* Remember that we were in class scope. */
13270 if (current_class_name)
13271 ctype = current_class_type;
13273 /* Must mark the RESULT_DECL as being in this function. */
13274 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13276 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13277 to the FUNCTION_DECL node itself. */
13278 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13280 /* Save away current state, if appropriate. */
13281 if (!processing_template_decl)
13282 save_function_data (fndecl);
13284 /* Complain if there's just no return statement. */
13285 if (warn_return_type
13286 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13287 && !dependent_type_p (TREE_TYPE (fntype))
13288 && !current_function_returns_value && !current_function_returns_null
13289 /* Don't complain if we abort or throw. */
13290 && !current_function_returns_abnormally
13291 /* Don't complain if we are declared noreturn. */
13292 && !TREE_THIS_VOLATILE (fndecl)
13293 && !DECL_NAME (DECL_RESULT (fndecl))
13294 && !TREE_NO_WARNING (fndecl)
13295 /* Structor return values (if any) are set by the compiler. */
13296 && !DECL_CONSTRUCTOR_P (fndecl)
13297 && !DECL_DESTRUCTOR_P (fndecl))
13299 warning (OPT_Wreturn_type,
13300 "no return statement in function returning non-void");
13301 TREE_NO_WARNING (fndecl) = 1;
13304 /* Store the end of the function, so that we get good line number
13305 info for the epilogue. */
13306 cfun->function_end_locus = input_location;
13308 /* Complain about parameters that are only set, but never otherwise used. */
13309 if (warn_unused_but_set_parameter
13310 && !processing_template_decl
13311 && errorcount == unused_but_set_errorcount
13312 && !DECL_CLONED_FUNCTION_P (fndecl))
13316 for (decl = DECL_ARGUMENTS (fndecl);
13318 decl = DECL_CHAIN (decl))
13319 if (TREE_USED (decl)
13320 && TREE_CODE (decl) == PARM_DECL
13321 && !DECL_READ_P (decl)
13322 && DECL_NAME (decl)
13323 && !DECL_ARTIFICIAL (decl)
13324 && !TREE_NO_WARNING (decl)
13325 && !DECL_IN_SYSTEM_HEADER (decl)
13326 && TREE_TYPE (decl) != error_mark_node
13327 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13328 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13329 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13330 warning (OPT_Wunused_but_set_parameter,
13331 "parameter %q+D set but not used", decl);
13332 unused_but_set_errorcount = errorcount;
13335 /* Genericize before inlining. */
13336 if (!processing_template_decl)
13338 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13339 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13340 cp_genericize (fndecl);
13341 /* Clear out the bits we don't need. */
13342 f->x_current_class_ptr = NULL;
13343 f->x_current_class_ref = NULL;
13344 f->x_eh_spec_block = NULL;
13345 f->x_in_charge_parm = NULL;
13346 f->x_vtt_parm = NULL;
13347 f->x_return_value = NULL;
13348 f->bindings = NULL;
13349 f->extern_decl_map = NULL;
13351 /* Clear out the bits we don't need. */
13352 local_names = NULL;
13354 /* We're leaving the context of this function, so zap cfun. It's still in
13355 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13357 current_function_decl = NULL;
13359 /* If this is an in-class inline definition, we may have to pop the
13360 bindings for the template parameters that we added in
13361 maybe_begin_member_template_processing when start_function was
13363 if (inclass_inline)
13364 maybe_end_member_template_processing ();
13366 /* Leave the scope of the class. */
13368 pop_nested_class ();
13373 current_function_decl = NULL_TREE;
13375 defer_mark_used_calls = false;
13376 if (deferred_mark_used_calls)
13381 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13383 VEC_free (tree, gc, deferred_mark_used_calls);
13389 /* Create the FUNCTION_DECL for a function definition.
13390 DECLSPECS and DECLARATOR are the parts of the declaration;
13391 they describe the return type and the name of the function,
13392 but twisted together in a fashion that parallels the syntax of C.
13394 This function creates a binding context for the function body
13395 as well as setting up the FUNCTION_DECL in current_function_decl.
13397 Returns a FUNCTION_DECL on success.
13399 If the DECLARATOR is not suitable for a function (it defines a datum
13400 instead), we return 0, which tells yyparse to report a parse error.
13402 May return void_type_node indicating that this method is actually
13403 a friend. See grokfield for more details.
13405 Came here with a `.pushlevel' .
13407 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13408 CHANGES TO CODE IN `grokfield'. */
13411 grokmethod (cp_decl_specifier_seq *declspecs,
13412 const cp_declarator *declarator, tree attrlist)
13414 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13417 if (fndecl == error_mark_node)
13418 return error_mark_node;
13420 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13422 error ("invalid member function declaration");
13423 return error_mark_node;
13427 cplus_decl_attributes (&fndecl, attrlist, 0);
13429 /* Pass friends other than inline friend functions back. */
13430 if (fndecl == void_type_node)
13433 if (DECL_IN_AGGR_P (fndecl))
13435 if (DECL_CLASS_SCOPE_P (fndecl))
13436 error ("%qD is already defined in class %qT", fndecl,
13437 DECL_CONTEXT (fndecl));
13438 return error_mark_node;
13441 check_template_shadow (fndecl);
13443 DECL_DECLARED_INLINE_P (fndecl) = 1;
13444 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13446 /* We process method specializations in finish_struct_1. */
13447 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13449 fndecl = push_template_decl (fndecl);
13450 if (fndecl == error_mark_node)
13454 if (! DECL_FRIEND_P (fndecl))
13456 if (DECL_CHAIN (fndecl))
13458 fndecl = copy_node (fndecl);
13459 TREE_CHAIN (fndecl) = NULL_TREE;
13463 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13465 DECL_IN_AGGR_P (fndecl) = 1;
13470 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13471 we can lay it out later, when and if its type becomes complete. */
13474 maybe_register_incomplete_var (tree var)
13476 gcc_assert (TREE_CODE (var) == VAR_DECL);
13478 /* Keep track of variables with incomplete types. */
13479 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13480 && DECL_EXTERNAL (var))
13482 tree inner_type = TREE_TYPE (var);
13484 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13485 inner_type = TREE_TYPE (inner_type);
13486 inner_type = TYPE_MAIN_VARIANT (inner_type);
13488 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13489 /* RTTI TD entries are created while defining the type_info. */
13490 || (TYPE_LANG_SPECIFIC (inner_type)
13491 && TYPE_BEING_DEFINED (inner_type)))
13494 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13496 iv->incomplete_type = inner_type;
13501 /* Called when a class type (given by TYPE) is defined. If there are
13502 any existing VAR_DECLs whose type has been completed by this
13503 declaration, update them now. */
13506 complete_vars (tree type)
13509 incomplete_var *iv;
13511 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13513 if (same_type_p (type, iv->incomplete_type))
13515 tree var = iv->decl;
13516 tree type = TREE_TYPE (var);
13517 /* Complete the type of the variable. The VAR_DECL itself
13518 will be laid out in expand_expr. */
13519 complete_type (type);
13520 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13521 /* Remove this entry from the list. */
13522 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13528 /* Check for pending declarations which may have abstract type. */
13529 complete_type_check_abstract (type);
13532 /* If DECL is of a type which needs a cleanup, build and return an
13533 expression to perform that cleanup here. Return NULL_TREE if no
13534 cleanup need be done. */
13537 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13543 /* Assume no cleanup is required. */
13544 cleanup = NULL_TREE;
13546 if (error_operand_p (decl))
13549 /* Handle "__attribute__((cleanup))". We run the cleanup function
13550 before the destructor since the destructor is what actually
13551 terminates the lifetime of the object. */
13552 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13559 /* Get the name specified by the user for the cleanup function. */
13560 id = TREE_VALUE (TREE_VALUE (attr));
13561 /* Look up the name to find the cleanup function to call. It is
13562 important to use lookup_name here because that is what is
13563 used in c-common.c:handle_cleanup_attribute when performing
13564 initial checks on the attribute. Note that those checks
13565 include ensuring that the function found is not an overloaded
13566 function, or an object with an overloaded call operator,
13567 etc.; we can rely on the fact that the function found is an
13568 ordinary FUNCTION_DECL. */
13569 fn = lookup_name (id);
13570 arg = build_address (decl);
13572 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13573 if (cleanup == error_mark_node)
13574 return error_mark_node;
13576 /* Handle ordinary C++ destructors. */
13577 type = TREE_TYPE (decl);
13578 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13580 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13581 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13582 && CLASSTYPE_VBASECLASSES (type));
13586 if (TREE_CODE (type) == ARRAY_TYPE)
13589 addr = build_address (decl);
13591 /* Optimize for space over speed here. */
13592 if (!has_vbases || flag_expensive_optimizations)
13593 flags |= LOOKUP_NONVIRTUAL;
13595 call = build_delete (TREE_TYPE (addr), addr,
13596 sfk_complete_destructor, flags, 0, complain);
13597 if (call == error_mark_node)
13598 cleanup = error_mark_node;
13600 cleanup = cp_build_compound_expr (cleanup, call, complain);
13608 /* When a stmt has been parsed, this function is called. */
13615 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13616 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13617 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13620 static_fn_type (tree memfntype)
13625 if (TYPE_PTRMEMFUNC_P (memfntype))
13626 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13627 if (POINTER_TYPE_P (memfntype)
13628 || TREE_CODE (memfntype) == FUNCTION_DECL)
13629 memfntype = TREE_TYPE (memfntype);
13630 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13632 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13633 args = TYPE_ARG_TYPES (memfntype);
13634 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13635 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13636 fntype = (cp_build_type_attribute_variant
13637 (fntype, TYPE_ATTRIBUTES (memfntype)));
13638 fntype = (build_exception_variant
13639 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13643 /* DECL was originally constructed as a non-static member function,
13644 but turned out to be static. Update it accordingly. */
13647 revert_static_member_fn (tree decl)
13649 tree stype = static_fn_type (decl);
13650 cp_cv_quals quals = type_memfn_quals (stype);
13652 if (quals != TYPE_UNQUALIFIED)
13653 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13655 TREE_TYPE (decl) = stype;
13657 if (DECL_ARGUMENTS (decl))
13658 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13659 DECL_STATIC_FUNCTION_P (decl) = 1;
13662 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13663 one of the language-independent trees. */
13665 enum cp_tree_node_structure_enum
13666 cp_tree_node_structure (union lang_tree_node * t)
13668 switch (TREE_CODE (&t->generic))
13670 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13671 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13672 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13673 case OVERLOAD: return TS_CP_OVERLOAD;
13674 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13675 case PTRMEM_CST: return TS_CP_PTRMEM;
13676 case BASELINK: return TS_CP_BASELINK;
13677 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13678 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13679 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13680 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13681 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13682 default: return TS_CP_GENERIC;
13686 /* Build the void_list_node (void_type_node having been created). */
13688 build_void_list_node (void)
13690 tree t = build_tree_list (NULL_TREE, void_type_node);
13695 cp_missing_noreturn_ok_p (tree decl)
13697 /* A missing noreturn is ok for the `main' function. */
13698 return DECL_MAIN_P (decl);
13701 /* Return the COMDAT group into which DECL should be placed. */
13704 cxx_comdat_group (tree decl)
13708 /* Virtual tables, construction virtual tables, and virtual table
13709 tables all go in a single COMDAT group, named after the primary
13711 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13712 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13713 /* For all other DECLs, the COMDAT group is the mangled name of the
13714 declaration itself. */
13717 while (DECL_THUNK_P (decl))
13719 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13720 into the same section as the target function. In that case
13721 we must return target's name. */
13722 tree target = THUNK_TARGET (decl);
13723 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13724 && DECL_SECTION_NAME (target) != NULL
13725 && DECL_ONE_ONLY (target))
13730 name = DECL_ASSEMBLER_NAME (decl);
13736 #include "gt-cp-decl.h"