1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
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 void record_unknown_type (tree, const char *);
78 static tree builtin_function_1 (tree, tree, bool);
79 static tree build_library_fn_1 (tree, enum tree_code, tree);
80 static int member_function_or_else (tree, tree, enum overload_flags);
81 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
83 static void check_for_uninitialized_const_var (tree);
84 static hashval_t typename_hash (const void *);
85 static int typename_compare (const void *, const void *);
86 static tree local_variable_p_walkfn (tree *, int *, void *);
87 static tree record_builtin_java_type (const char *, int);
88 static const char *tag_name (enum tag_types);
89 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
90 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
91 static void maybe_deduce_size_from_array_init (tree, tree);
92 static void layout_var_decl (tree);
93 static tree check_initializer (tree, tree, int, tree *);
94 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
95 static void save_function_data (tree);
96 static void copy_type_enum (tree , tree);
97 static void check_function_type (tree, tree);
98 static void finish_constructor_body (void);
99 static void begin_destructor_body (void);
100 static void finish_destructor_body (void);
101 static void record_key_method_defined (tree);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (location_t, tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
117 /* The following symbols are subsumed in the cp_global_trees array, and
118 listed here individually for documentation purposes.
121 tree wchar_decl_node;
123 tree vtable_entry_type;
124 tree delta_type_node;
125 tree __t_desc_type_node;
127 tree class_type_node;
128 tree unknown_type_node;
130 Array type `vtable_entry_type[]'
133 tree vtbl_ptr_type_node;
140 A FUNCTION_DECL which can call `abort'. Not necessarily the
141 one that the user will declare, but sufficient to be called
142 by routines that want to abort the program.
146 The FUNCTION_DECL for the default `::operator delete'.
148 tree global_delete_fndecl;
151 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
152 tree tinfo_var_id; */
154 tree cp_global_trees[CPTI_MAX];
156 /* Indicates that there is a type value in some namespace, although
157 that is not necessarily in scope at the moment. */
159 tree global_type_node;
161 /* The node that holds the "name" of the global scope. */
162 tree global_scope_name;
164 #define local_names cp_function_chain->x_local_names
166 /* A list of objects which have constructors or destructors
167 which reside in the global scope. The decl is stored in
168 the TREE_VALUE slot and the initializer is stored
169 in the TREE_PURPOSE slot. */
170 tree static_aggregates;
174 /* A node for the integer constant 2. */
176 tree integer_two_node;
178 /* Used only for jumps to as-yet undefined labels, since jumps to
179 defined labels can have their validity checked immediately. */
181 struct GTY(()) named_label_use_entry {
182 struct named_label_use_entry *next;
183 /* The binding level to which this entry is *currently* attached.
184 This is initially the binding level in which the goto appeared,
185 but is modified as scopes are closed. */
186 struct cp_binding_level *binding_level;
187 /* The head of the names list that was current when the goto appeared,
188 or the inner scope popped. These are the decls that will *not* be
189 skipped when jumping to the label. */
191 /* The location of the goto, for error reporting. */
192 location_t o_goto_locus;
193 /* True if an OpenMP structured block scope has been closed since
194 the goto appeared. This means that the branch from the label will
195 illegally exit an OpenMP scope. */
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct GTY(()) named_label_entry {
204 /* The decl itself. */
207 /* The binding level to which the label is *currently* attached.
208 This is initially set to the binding level in which the label
209 is defined, but is modified as scopes are closed. */
210 struct cp_binding_level *binding_level;
211 /* The head of the names list that was current when the label was
212 defined, or the inner scope popped. These are the decls that will
213 be skipped when jumping to the label. */
215 /* A vector of all decls from all binding levels that would be
216 crossed by a backward branch to the label. */
217 VEC(tree,gc) *bad_decls;
219 /* A list of uses of the label, before the label is defined. */
220 struct named_label_use_entry *uses;
222 /* The following bits are set after the label is defined, and are
223 updated as scopes are popped. They indicate that a backward jump
224 to the label will illegally enter a scope of the given flavor. */
230 #define named_labels cp_function_chain->x_named_labels
232 /* The number of function bodies which we are currently processing.
233 (Zero if we are at namespace scope, one inside the body of a
234 function, two inside the body of a function in a local class, etc.) */
237 /* To avoid unwanted recursion, finish_function defers all mark_used calls
238 encountered during its execution until it finishes. */
239 bool defer_mark_used_calls;
240 VEC(tree, gc) *deferred_mark_used_calls;
242 /* States indicating how grokdeclarator() should handle declspecs marked
243 with __attribute__((deprecated)). An object declared as
244 __attribute__((deprecated)) suppresses warnings of uses of other
246 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
249 /* A list of VAR_DECLs whose type was incomplete at the time the
250 variable was declared. */
252 typedef struct GTY(()) incomplete_var_d {
254 tree incomplete_type;
257 DEF_VEC_O(incomplete_var);
258 DEF_VEC_ALLOC_O(incomplete_var,gc);
260 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
262 /* Returns the kind of template specialization we are currently
263 processing, given that it's declaration contained N_CLASS_SCOPES
264 explicit scope qualifications. */
267 current_tmpl_spec_kind (int n_class_scopes)
269 int n_template_parm_scopes = 0;
270 int seen_specialization_p = 0;
271 int innermost_specialization_p = 0;
272 struct cp_binding_level *b;
274 /* Scan through the template parameter scopes. */
275 for (b = current_binding_level;
276 b->kind == sk_template_parms;
279 /* If we see a specialization scope inside a parameter scope,
280 then something is wrong. That corresponds to a declaration
283 template <class T> template <> ...
285 which is always invalid since [temp.expl.spec] forbids the
286 specialization of a class member template if the enclosing
287 class templates are not explicitly specialized as well. */
288 if (b->explicit_spec_p)
290 if (n_template_parm_scopes == 0)
291 innermost_specialization_p = 1;
293 seen_specialization_p = 1;
295 else if (seen_specialization_p == 1)
296 return tsk_invalid_member_spec;
298 ++n_template_parm_scopes;
301 /* Handle explicit instantiations. */
302 if (processing_explicit_instantiation)
304 if (n_template_parm_scopes != 0)
305 /* We've seen a template parameter list during an explicit
306 instantiation. For example:
308 template <class T> template void f(int);
310 This is erroneous. */
311 return tsk_invalid_expl_inst;
313 return tsk_expl_inst;
316 if (n_template_parm_scopes < n_class_scopes)
317 /* We've not seen enough template headers to match all the
318 specialized classes present. For example:
320 template <class T> void R<T>::S<T>::f(int);
322 This is invalid; there needs to be one set of template
323 parameters for each class. */
324 return tsk_insufficient_parms;
325 else if (n_template_parm_scopes == n_class_scopes)
326 /* We're processing a non-template declaration (even though it may
327 be a member of a template class.) For example:
329 template <class T> void S<T>::f(int);
331 The `class T' matches the `S<T>', leaving no template headers
332 corresponding to the `f'. */
334 else if (n_template_parm_scopes > n_class_scopes + 1)
335 /* We've got too many template headers. For example:
337 template <> template <class T> void f (T);
339 There need to be more enclosing classes. */
340 return tsk_excessive_parms;
342 /* This must be a template. It's of the form:
344 template <class T> template <class U> void S<T>::f(U);
346 This is a specialization if the innermost level was a
347 specialization; otherwise it's just a definition of the
349 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
352 /* Exit the current scope. */
360 /* When a label goes out of scope, check to see if that label was used
361 in a valid manner, and issue any appropriate warnings or errors. */
364 pop_label (tree label, tree old_value)
366 if (!processing_template_decl)
368 if (DECL_INITIAL (label) == NULL_TREE)
372 error ("label %q+D used but not defined", label);
373 location = input_location; /* FIXME want (input_filename, (line)0) */
374 /* Avoid crashing later. */
375 define_label (location, DECL_NAME (label));
378 warn_for_unused_label (label);
381 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
389 pop_labels_1 (void **slot, void *data)
391 struct named_label_entry *ent = (struct named_label_entry *) *slot;
392 tree block = (tree) data;
394 pop_label (ent->label_decl, NULL_TREE);
396 /* Put the labels into the "variables" of the top-level block,
397 so debugger can see them. */
398 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
399 BLOCK_VARS (block) = ent->label_decl;
401 htab_clear_slot (named_labels, slot);
407 pop_labels (tree block)
411 htab_traverse (named_labels, pop_labels_1, block);
416 /* At the end of a block with local labels, restore the outer definition. */
419 pop_local_label (tree label, tree old_value)
421 struct named_label_entry dummy;
424 pop_label (label, old_value);
426 dummy.label_decl = label;
427 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
428 htab_clear_slot (named_labels, slot);
431 /* The following two routines are used to interface to Objective-C++.
432 The binding level is purposely treated as an opaque type. */
435 objc_get_current_scope (void)
437 return current_binding_level;
440 /* The following routine is used by the NeXT-style SJLJ exceptions;
441 variables get marked 'volatile' so as to not be clobbered by
442 _setjmp()/_longjmp() calls. All variables in the current scope,
443 as well as parent scopes up to (but not including) ENCLOSING_BLK
444 shall be thusly marked. */
447 objc_mark_locals_volatile (void *enclosing_blk)
449 struct cp_binding_level *scope;
451 for (scope = current_binding_level;
452 scope && scope != enclosing_blk;
453 scope = scope->level_chain)
457 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
458 objc_volatilize_decl (decl);
460 /* Do not climb up past the current function. */
461 if (scope->kind == sk_function_parms)
466 /* Update data for defined and undefined labels when leaving a scope. */
469 poplevel_named_label_1 (void **slot, void *data)
471 struct named_label_entry *ent = (struct named_label_entry *) *slot;
472 struct cp_binding_level *bl = (struct cp_binding_level *) data;
473 struct cp_binding_level *obl = bl->level_chain;
475 if (ent->binding_level == bl)
479 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
480 TREE_LISTs representing OVERLOADs, so be careful. */
481 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
483 : TREE_CHAIN (decl)))
484 if (decl_jump_unsafe (decl))
485 VEC_safe_push (tree, gc, ent->bad_decls, decl);
487 ent->binding_level = obl;
488 ent->names_in_scope = obl->names;
492 ent->in_try_scope = true;
495 ent->in_catch_scope = true;
498 ent->in_omp_scope = true;
506 struct named_label_use_entry *use;
508 for (use = ent->uses; use ; use = use->next)
509 if (use->binding_level == bl)
511 use->binding_level = obl;
512 use->names_in_scope = obl->names;
513 if (bl->kind == sk_omp)
514 use->in_omp_scope = true;
521 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
522 when errors were reported, except for -Werror-unused-but-set-*. */
523 static int unused_but_set_errorcount;
525 /* Exit a binding level.
526 Pop the level off, and restore the state of the identifier-decl mappings
527 that were in effect when this level was entered.
529 If KEEP == 1, this level had explicit declarations, so
530 and create a "block" (a BLOCK node) for the level
531 to record its declarations and subblocks for symbol table output.
533 If FUNCTIONBODY is nonzero, this level is the body of a function,
534 so create a block as if KEEP were set and also clear out all
537 If REVERSE is nonzero, reverse the order of decls before putting
538 them into the BLOCK. */
541 poplevel (int keep, int reverse, int functionbody)
544 /* The chain of decls was accumulated in reverse order.
545 Put it into forward order, just for cleanliness. */
550 int leaving_for_scope;
553 cp_label_binding *label_bind;
555 timevar_push (TV_NAME_LOOKUP);
560 gcc_assert (current_binding_level->kind != sk_class);
562 if (current_binding_level->kind == sk_cleanup)
564 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
566 gcc_assert (!VEC_length(cp_class_binding,
567 current_binding_level->class_shadowed));
569 /* We used to use KEEP == 2 to indicate that the new block should go
570 at the beginning of the list of blocks at this binding level,
571 rather than the end. This hack is no longer used. */
572 gcc_assert (keep == 0 || keep == 1);
574 if (current_binding_level->keep)
577 /* Any uses of undefined labels, and any defined labels, now operate
578 under constraints of next binding contour. */
579 if (cfun && !functionbody && named_labels)
580 htab_traverse (named_labels, poplevel_named_label_1,
581 current_binding_level);
583 /* Get the decls in the order they were written.
584 Usually current_binding_level->names is in reverse order.
585 But parameter decls were previously put in forward order. */
588 current_binding_level->names
589 = decls = nreverse (current_binding_level->names);
591 decls = current_binding_level->names;
593 /* If there were any declarations or structure tags in that level,
594 or if this level is a function body,
595 create a BLOCK to record them for the life of this function. */
597 if (keep == 1 || functionbody)
598 block = make_node (BLOCK);
599 if (block != NULL_TREE)
601 BLOCK_VARS (block) = decls;
602 BLOCK_SUBBLOCKS (block) = subblocks;
605 /* In each subblock, record that this is its superior. */
607 for (link = subblocks; link; link = BLOCK_CHAIN (link))
608 BLOCK_SUPERCONTEXT (link) = block;
610 /* We still support the old for-scope rules, whereby the variables
611 in a for-init statement were in scope after the for-statement
612 ended. We only use the new rules if flag_new_for_scope is
615 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
617 /* Before we remove the declarations first check for unused variables. */
618 if ((warn_unused_variable || warn_unused_but_set_variable)
619 && !processing_template_decl)
620 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
621 if (TREE_CODE (decl) == VAR_DECL
622 && (! TREE_USED (decl) || !DECL_READ_P (decl))
623 && ! DECL_IN_SYSTEM_HEADER (decl)
624 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
626 if (! TREE_USED (decl))
627 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
628 else if (DECL_CONTEXT (decl) == current_function_decl
629 && TREE_TYPE (decl) != error_mark_node
630 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
631 && errorcount == unused_but_set_errorcount
632 && (!CLASS_TYPE_P (TREE_TYPE (decl))
633 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
635 warning (OPT_Wunused_but_set_variable,
636 "variable %q+D set but not used", decl);
637 unused_but_set_errorcount = errorcount;
641 /* Remove declarations for all the DECLs in this level. */
642 for (link = decls; link; link = TREE_CHAIN (link))
644 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
647 tree name = DECL_NAME (link);
651 ob = outer_binding (name,
652 IDENTIFIER_BINDING (name),
655 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
657 ns_binding = NULL_TREE;
659 if (ob && ob->scope == current_binding_level->level_chain)
660 /* We have something like:
665 and we are leaving the `for' scope. There's no reason to
666 keep the binding of the inner `i' in this case. */
667 pop_binding (name, link);
668 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
669 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
670 /* Here, we have something like:
678 We must pop the for-scope binding so we know what's a
679 type and what isn't. */
680 pop_binding (name, link);
683 /* Mark this VAR_DECL as dead so that we can tell we left it
684 there only for backward compatibility. */
685 DECL_DEAD_FOR_LOCAL (link) = 1;
687 /* Keep track of what should have happened when we
688 popped the binding. */
691 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
692 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
695 /* Add it to the list of dead variables in the next
696 outermost binding to that we can remove these when we
697 leave that binding. */
698 VEC_safe_push (tree, gc,
699 current_binding_level->level_chain->dead_vars_from_for,
702 /* Although we don't pop the cxx_binding, we do clear
703 its SCOPE since the scope is going away now. */
704 IDENTIFIER_BINDING (name)->scope
705 = current_binding_level->level_chain;
712 /* Remove the binding. */
715 if (TREE_CODE (decl) == TREE_LIST)
716 decl = TREE_VALUE (decl);
719 if (TREE_CODE (name) == OVERLOAD)
720 name = OVL_FUNCTION (name);
722 gcc_assert (DECL_P (name));
723 pop_binding (DECL_NAME (name), decl);
727 /* Remove declarations for any `for' variables from inner scopes
728 that we kept around. */
729 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
731 pop_binding (DECL_NAME (decl), decl);
733 /* Restore the IDENTIFIER_TYPE_VALUEs. */
734 for (link = current_binding_level->type_shadowed;
735 link; link = TREE_CHAIN (link))
736 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
738 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
739 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
740 current_binding_level->shadowed_labels,
742 pop_local_label (label_bind->label, label_bind->prev_value);
744 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
745 list if a `using' declaration put them there. The debugging
746 back ends won't understand OVERLOAD, so we remove them here.
747 Because the BLOCK_VARS are (temporarily) shared with
748 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
749 popped all the bindings. */
754 for (d = &BLOCK_VARS (block); *d; )
756 if (TREE_CODE (*d) == TREE_LIST)
757 *d = TREE_CHAIN (*d);
759 d = &DECL_CHAIN (*d);
763 /* If the level being exited is the top level of a function,
764 check over all the labels. */
767 /* Since this is the top level block of a function, the vars are
768 the function's parameters. Don't leave them in the BLOCK
769 because they are found in the FUNCTION_DECL instead. */
770 BLOCK_VARS (block) = 0;
774 kind = current_binding_level->kind;
775 if (kind == sk_cleanup)
779 /* If this is a temporary binding created for a cleanup, then we'll
780 have pushed a statement list level. Pop that, create a new
781 BIND_EXPR for the block, and insert it into the stream. */
782 stmt = pop_stmt_list (current_binding_level->statement_list);
783 stmt = c_build_bind_expr (input_location, block, stmt);
790 /* The current function is being defined, so its DECL_INITIAL
791 should be error_mark_node. */
792 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
793 DECL_INITIAL (current_function_decl) = block;
796 current_binding_level->blocks
797 = chainon (current_binding_level->blocks, block);
799 /* If we did not make a block for the level just exited,
800 any blocks made for inner levels
801 (since they cannot be recorded as subblocks in that level)
802 must be carried forward so they will later become subblocks
803 of something else. */
805 current_binding_level->blocks
806 = chainon (current_binding_level->blocks, subblocks);
808 /* Each and every BLOCK node created here in `poplevel' is important
809 (e.g. for proper debugging information) so if we created one
810 earlier, mark it as "used". */
812 TREE_USED (block) = 1;
814 /* All temporary bindings created for cleanups are popped silently. */
815 if (kind == sk_cleanup)
818 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
821 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
822 itself, calling F for each. The DATA is passed to F as well. */
825 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
828 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
830 result |= (*f) (name_space, data);
832 for (; current; current = DECL_CHAIN (current))
833 result |= walk_namespaces_r (current, f, data);
838 /* Walk all the namespaces, calling F for each. The DATA is passed to
842 walk_namespaces (walk_namespaces_fn f, void* data)
844 return walk_namespaces_r (global_namespace, f, data);
847 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
848 DATA is non-NULL, this is the last time we will call
849 wrapup_global_declarations for this NAMESPACE. */
852 wrapup_globals_for_namespace (tree name_space, void* data)
854 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
855 VEC(tree,gc) *statics = level->static_decls;
856 tree *vec = VEC_address (tree, statics);
857 int len = VEC_length (tree, statics);
858 int last_time = (data != 0);
862 check_global_declarations (vec, len);
863 emit_debug_global_declarations (vec, len);
867 /* Write out any globals that need to be output. */
868 return wrapup_global_declarations (vec, len);
872 /* In C++, you don't have to write `struct S' to refer to `S'; you
873 can just use `S'. We accomplish this by creating a TYPE_DECL as
874 if the user had written `typedef struct S S'. Create and return
875 the TYPE_DECL for TYPE. */
878 create_implicit_typedef (tree name, tree type)
882 decl = build_decl (input_location, TYPE_DECL, name, type);
883 DECL_ARTIFICIAL (decl) = 1;
884 /* There are other implicit type declarations, like the one *within*
885 a class that allows you to write `S::S'. We must distinguish
887 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
888 TYPE_NAME (type) = decl;
889 TYPE_STUB_DECL (type) = decl;
894 /* Remember a local name for name-mangling purposes. */
897 push_local_name (tree decl)
902 timevar_push (TV_NAME_LOOKUP);
904 name = DECL_NAME (decl);
906 nelts = VEC_length (tree, local_names);
907 for (i = 0; i < nelts; i++)
909 t = VEC_index (tree, local_names, i);
910 if (DECL_NAME (t) == name)
912 if (!DECL_LANG_SPECIFIC (decl))
913 retrofit_lang_decl (decl);
914 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
915 if (DECL_LANG_SPECIFIC (t))
916 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
918 DECL_DISCRIMINATOR (decl) = 1;
920 VEC_replace (tree, local_names, i, decl);
921 timevar_pop (TV_NAME_LOOKUP);
926 VEC_safe_push (tree, gc, local_names, decl);
927 timevar_pop (TV_NAME_LOOKUP);
930 /* Subroutine of duplicate_decls: return truthvalue of whether
931 or not types of these decls match.
933 For C++, we must compare the parameter list so that `int' can match
934 `int&' in a parameter position, but `int&' is not confused with
938 decls_match (tree newdecl, tree olddecl)
942 if (newdecl == olddecl)
945 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
946 /* If the two DECLs are not even the same kind of thing, we're not
947 interested in their types. */
950 if (TREE_CODE (newdecl) == FUNCTION_DECL)
952 tree f1 = TREE_TYPE (newdecl);
953 tree f2 = TREE_TYPE (olddecl);
954 tree p1 = TYPE_ARG_TYPES (f1);
955 tree p2 = TYPE_ARG_TYPES (f2);
957 /* Specializations of different templates are different functions
958 even if they have the same type. */
959 tree t1 = (DECL_USE_TEMPLATE (newdecl)
960 ? DECL_TI_TEMPLATE (newdecl)
962 tree t2 = (DECL_USE_TEMPLATE (olddecl)
963 ? DECL_TI_TEMPLATE (olddecl)
968 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
969 && ! (DECL_EXTERN_C_P (newdecl)
970 && DECL_EXTERN_C_P (olddecl)))
973 #ifdef NO_IMPLICIT_EXTERN_C
974 /* A new declaration doesn't match a built-in one unless it
975 is also extern "C". */
976 if (DECL_IS_BUILTIN (olddecl)
977 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
981 if (TREE_CODE (f1) != TREE_CODE (f2))
984 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
986 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
987 && (DECL_BUILT_IN (olddecl)
988 #ifndef NO_IMPLICIT_EXTERN_C
989 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
990 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
994 types_match = self_promoting_args_p (p1);
995 if (p1 == void_list_node)
996 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
998 #ifndef NO_IMPLICIT_EXTERN_C
999 else if (!prototype_p (f1)
1000 && (DECL_EXTERN_C_P (olddecl)
1001 && DECL_IN_SYSTEM_HEADER (olddecl)
1002 && !DECL_CLASS_SCOPE_P (olddecl))
1003 && (DECL_EXTERN_C_P (newdecl)
1004 && DECL_IN_SYSTEM_HEADER (newdecl)
1005 && !DECL_CLASS_SCOPE_P (newdecl)))
1007 types_match = self_promoting_args_p (p2);
1008 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1014 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1015 || targetm.comp_type_attributes (TREE_TYPE (newdecl),
1016 TREE_TYPE (olddecl)) != 0);
1021 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1023 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1024 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1027 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1028 DECL_TEMPLATE_PARMS (olddecl)))
1031 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1032 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1033 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1035 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1036 DECL_TEMPLATE_RESULT (newdecl));
1040 /* Need to check scope for variable declaration (VAR_DECL).
1041 For typedef (TYPE_DECL), scope is ignored. */
1042 if (TREE_CODE (newdecl) == VAR_DECL
1043 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1045 Two declarations for an object with C language linkage
1046 with the same name (ignoring the namespace that qualify
1047 it) that appear in different namespace scopes refer to
1049 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1052 if (TREE_TYPE (newdecl) == error_mark_node)
1053 types_match = TREE_TYPE (olddecl) == error_mark_node;
1054 else if (TREE_TYPE (olddecl) == NULL_TREE)
1055 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1056 else if (TREE_TYPE (newdecl) == NULL_TREE)
1059 types_match = comptypes (TREE_TYPE (newdecl),
1060 TREE_TYPE (olddecl),
1061 COMPARE_REDECLARATION);
1067 /* If NEWDECL is `static' and an `extern' was seen previously,
1068 warn about it. OLDDECL is the previous declaration.
1070 Note that this does not apply to the C++ case of declaring
1071 a variable `extern const' and then later `const'.
1073 Don't complain about built-in functions, since they are beyond
1074 the user's control. */
1077 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1079 if (TREE_CODE (newdecl) == TYPE_DECL
1080 || TREE_CODE (newdecl) == TEMPLATE_DECL
1081 || TREE_CODE (newdecl) == CONST_DECL
1082 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1085 /* Don't get confused by static member functions; that's a different
1087 if (TREE_CODE (newdecl) == FUNCTION_DECL
1088 && DECL_STATIC_FUNCTION_P (newdecl))
1091 /* If the old declaration was `static', or the new one isn't, then
1092 then everything is OK. */
1093 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1096 /* It's OK to declare a builtin function as `static'. */
1097 if (TREE_CODE (olddecl) == FUNCTION_DECL
1098 && DECL_ARTIFICIAL (olddecl))
1101 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1102 permerror (input_location, "previous declaration of %q+D", olddecl);
1105 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1106 function templates. If their exception specifications do not
1107 match, issue a diagnostic. */
1110 check_redeclaration_exception_specification (tree new_decl,
1115 tree new_exceptions;
1116 tree old_exceptions;
1118 new_type = TREE_TYPE (new_decl);
1119 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1120 old_type = TREE_TYPE (old_decl);
1121 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1125 If any declaration of a function has an exception-specification,
1126 all declarations, including the definition and an explicit
1127 specialization, of that function shall have an
1128 exception-specification with the same set of type-ids. */
1129 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1130 && ! DECL_IS_BUILTIN (old_decl)
1132 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1134 error ("declaration of %qF has a different exception specifier",
1136 error ("from previous declaration %q+F", old_decl);
1140 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1141 Otherwise issue diagnostics. */
1144 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1146 old_decl = STRIP_TEMPLATE (old_decl);
1147 new_decl = STRIP_TEMPLATE (new_decl);
1148 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1149 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1151 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1152 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1154 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1156 /* Hide a built-in declaration. */
1157 DECL_DECLARED_CONSTEXPR_P (old_decl)
1158 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1161 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1162 error ("from previous declaration %q+D", old_decl);
1166 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1167 && lookup_attribute ("gnu_inline", \
1168 DECL_ATTRIBUTES (fn)))
1170 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1171 If the redeclaration is invalid, a diagnostic is issued, and the
1172 error_mark_node is returned. Otherwise, OLDDECL is returned.
1174 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1177 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1180 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1182 unsigned olddecl_uid = DECL_UID (olddecl);
1183 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1184 int new_defines_function = 0;
1185 tree new_template_info;
1187 if (newdecl == olddecl)
1190 types_match = decls_match (newdecl, olddecl);
1192 /* If either the type of the new decl or the type of the old decl is an
1193 error_mark_node, then that implies that we have already issued an
1194 error (earlier) for some bogus type specification, and in that case,
1195 it is rather pointless to harass the user with yet more error message
1196 about the same declaration, so just pretend the types match here. */
1197 if (TREE_TYPE (newdecl) == error_mark_node
1198 || TREE_TYPE (olddecl) == error_mark_node)
1199 return error_mark_node;
1201 if (DECL_P (olddecl)
1202 && TREE_CODE (newdecl) == FUNCTION_DECL
1203 && TREE_CODE (olddecl) == FUNCTION_DECL
1204 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1206 if (DECL_DECLARED_INLINE_P (newdecl)
1207 && DECL_UNINLINABLE (newdecl)
1208 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1209 /* Already warned elsewhere. */;
1210 else if (DECL_DECLARED_INLINE_P (olddecl)
1211 && DECL_UNINLINABLE (olddecl)
1212 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1213 /* Already warned. */;
1214 else if (DECL_DECLARED_INLINE_P (newdecl)
1215 && DECL_UNINLINABLE (olddecl)
1216 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1220 warning (OPT_Wattributes, "previous declaration of %q+D "
1221 "with attribute noinline", olddecl);
1223 else if (DECL_DECLARED_INLINE_P (olddecl)
1224 && DECL_UNINLINABLE (newdecl)
1225 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1227 warning (OPT_Wattributes, "function %q+D redeclared with "
1228 "attribute noinline", newdecl);
1229 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1234 /* Check for redeclaration and other discrepancies. */
1235 if (TREE_CODE (olddecl) == FUNCTION_DECL
1236 && DECL_ARTIFICIAL (olddecl))
1238 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1239 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1241 /* Avoid warnings redeclaring built-ins which have not been
1242 explicitly declared. */
1243 if (DECL_ANTICIPATED (olddecl))
1246 /* If you declare a built-in or predefined function name as static,
1247 the old definition is overridden, but optionally warn this was a
1248 bad choice of name. */
1249 if (! TREE_PUBLIC (newdecl))
1251 warning (OPT_Wshadow,
1252 DECL_BUILT_IN (olddecl)
1253 ? G_("shadowing built-in function %q#D")
1254 : G_("shadowing library function %q#D"), olddecl);
1255 /* Discard the old built-in function. */
1258 /* If the built-in is not ansi, then programs can override
1259 it even globally without an error. */
1260 else if (! DECL_BUILT_IN (olddecl))
1261 warning (0, "library function %q#D redeclared as non-function %q#D",
1265 error ("declaration of %q#D", newdecl);
1266 error ("conflicts with built-in declaration %q#D",
1271 else if (!types_match)
1273 /* Avoid warnings redeclaring built-ins which have not been
1274 explicitly declared. */
1275 if (DECL_ANTICIPATED (olddecl))
1277 /* Deal with fileptr_type_node. FILE type is not known
1278 at the time we create the builtins. */
1281 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1282 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1284 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1287 else if (TREE_VALUE (t2) == fileptr_type_node)
1289 tree t = TREE_VALUE (t1);
1291 if (TREE_CODE (t) == POINTER_TYPE
1292 && TYPE_NAME (TREE_TYPE (t))
1293 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1294 == get_identifier ("FILE")
1295 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1297 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1299 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1300 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1301 types_match = decls_match (newdecl, olddecl);
1303 return duplicate_decls (newdecl, olddecl,
1305 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1308 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1311 else if ((DECL_EXTERN_C_P (newdecl)
1312 && DECL_EXTERN_C_P (olddecl))
1313 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1314 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1316 /* A near match; override the builtin. */
1318 if (TREE_PUBLIC (newdecl))
1320 warning (0, "new declaration %q#D", newdecl);
1321 warning (0, "ambiguates built-in declaration %q#D",
1325 warning (OPT_Wshadow,
1326 DECL_BUILT_IN (olddecl)
1327 ? G_("shadowing built-in function %q#D")
1328 : G_("shadowing library function %q#D"), olddecl);
1331 /* Discard the old built-in function. */
1334 /* Replace the old RTL to avoid problems with inlining. */
1335 COPY_DECL_RTL (newdecl, olddecl);
1337 /* Even if the types match, prefer the new declarations type for
1338 built-ins which have not been explicitly declared, for
1339 exception lists, etc... */
1340 else if (DECL_IS_BUILTIN (olddecl))
1342 tree type = TREE_TYPE (newdecl);
1343 tree attribs = (*targetm.merge_type_attributes)
1344 (TREE_TYPE (olddecl), type);
1346 type = cp_build_type_attribute_variant (type, attribs);
1347 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1350 /* If a function is explicitly declared "throw ()", propagate that to
1351 the corresponding builtin. */
1352 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1353 && DECL_ANTICIPATED (olddecl)
1354 && TREE_NOTHROW (newdecl)
1355 && !TREE_NOTHROW (olddecl)
1356 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1357 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1359 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1361 /* Whether or not the builtin can throw exceptions has no
1362 bearing on this declarator. */
1363 TREE_NOTHROW (olddecl) = 0;
1365 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1367 /* If a builtin function is redeclared as `static', merge
1368 the declarations, but make the original one static. */
1369 DECL_THIS_STATIC (olddecl) = 1;
1370 TREE_PUBLIC (olddecl) = 0;
1372 /* Make the old declaration consistent with the new one so
1373 that all remnants of the builtin-ness of this function
1374 will be banished. */
1375 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1376 COPY_DECL_RTL (newdecl, olddecl);
1379 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1381 /* C++ Standard, 3.3, clause 4:
1382 "[Note: a namespace name or a class template name must be unique
1383 in its declarative region (7.3.2, clause 14). ]" */
1384 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1385 && TREE_CODE (newdecl) != NAMESPACE_DECL
1386 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1387 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1388 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1389 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1391 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1392 && TREE_CODE (newdecl) != TYPE_DECL)
1393 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1394 && TREE_CODE (olddecl) != TYPE_DECL))
1396 /* We do nothing special here, because C++ does such nasty
1397 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1398 get shadowed, and know that if we need to find a TYPE_DECL
1399 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1400 slot of the identifier. */
1404 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1405 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1406 || (TREE_CODE (olddecl) == FUNCTION_DECL
1407 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1411 error ("%q#D redeclared as different kind of symbol", newdecl);
1412 if (TREE_CODE (olddecl) == TREE_LIST)
1413 olddecl = TREE_VALUE (olddecl);
1414 error ("previous declaration of %q+#D", olddecl);
1416 return error_mark_node;
1418 else if (!types_match)
1420 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1421 /* These are certainly not duplicate declarations; they're
1422 from different scopes. */
1425 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1427 /* The name of a class template may not be declared to refer to
1428 any other template, class, function, object, namespace, value,
1429 or type in the same scope. */
1430 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1431 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1433 error ("declaration of template %q#D", newdecl);
1434 error ("conflicts with previous declaration %q+#D", olddecl);
1436 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1437 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1438 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1439 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1440 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1441 DECL_TEMPLATE_PARMS (olddecl))
1442 /* Template functions can be disambiguated by
1444 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1445 TREE_TYPE (TREE_TYPE (olddecl))))
1447 error ("new declaration %q#D", newdecl);
1448 error ("ambiguates old declaration %q+#D", olddecl);
1452 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1454 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1456 error ("declaration of C function %q#D conflicts with",
1458 error ("previous declaration %q+#D here", olddecl);
1460 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1461 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1463 error ("new declaration %q#D", newdecl);
1464 error ("ambiguates old declaration %q+#D", olddecl);
1465 return error_mark_node;
1472 error ("conflicting declaration %q#D", newdecl);
1473 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1474 return error_mark_node;
1477 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1478 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1479 && (!DECL_TEMPLATE_INFO (newdecl)
1480 || (DECL_TI_TEMPLATE (newdecl)
1481 != DECL_TI_TEMPLATE (olddecl))))
1482 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1483 && (!DECL_TEMPLATE_INFO (olddecl)
1484 || (DECL_TI_TEMPLATE (olddecl)
1485 != DECL_TI_TEMPLATE (newdecl))))))
1486 /* It's OK to have a template specialization and a non-template
1487 with the same type, or to have specializations of two
1488 different templates with the same type. Note that if one is a
1489 specialization, and the other is an instantiation of the same
1490 template, that we do not exit at this point. That situation
1491 can occur if we instantiate a template class, and then
1492 specialize one of its methods. This situation is valid, but
1493 the declarations must be merged in the usual way. */
1495 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1496 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1497 && !DECL_USE_TEMPLATE (newdecl))
1498 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1499 && !DECL_USE_TEMPLATE (olddecl))))
1500 /* One of the declarations is a template instantiation, and the
1501 other is not a template at all. That's OK. */
1503 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1505 /* In [namespace.alias] we have:
1507 In a declarative region, a namespace-alias-definition can be
1508 used to redefine a namespace-alias declared in that declarative
1509 region to refer only to the namespace to which it already
1512 Therefore, if we encounter a second alias directive for the same
1513 alias, we can just ignore the second directive. */
1514 if (DECL_NAMESPACE_ALIAS (newdecl)
1515 && (DECL_NAMESPACE_ALIAS (newdecl)
1516 == DECL_NAMESPACE_ALIAS (olddecl)))
1518 /* [namespace.alias]
1520 A namespace-name or namespace-alias shall not be declared as
1521 the name of any other entity in the same declarative region.
1522 A namespace-name defined at global scope shall not be
1523 declared as the name of any other entity in any global scope
1525 error ("declaration of namespace %qD conflicts with", newdecl);
1526 error ("previous declaration of namespace %q+D here", olddecl);
1527 return error_mark_node;
1531 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1534 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1535 if (DECL_NAME (olddecl) != NULL_TREE)
1536 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1537 ? "%q+#D previously defined here"
1538 : "%q+#D previously declared here", olddecl);
1539 return error_mark_node;
1541 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1542 && DECL_INITIAL (olddecl) != NULL_TREE
1543 && !prototype_p (TREE_TYPE (olddecl))
1544 && prototype_p (TREE_TYPE (newdecl)))
1546 /* Prototype decl follows defn w/o prototype. */
1547 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1548 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1549 "follows non-prototype definition here");
1551 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1552 || TREE_CODE (olddecl) == VAR_DECL)
1553 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1556 If two declarations of the same function or object
1557 specify different linkage-specifications ..., the program
1558 is ill-formed.... Except for functions with C++ linkage,
1559 a function declaration without a linkage specification
1560 shall not precede the first linkage specification for
1561 that function. A function can be declared without a
1562 linkage specification after an explicit linkage
1563 specification has been seen; the linkage explicitly
1564 specified in the earlier declaration is not affected by
1565 such a function declaration.
1567 DR 563 raises the question why the restrictions on
1568 functions should not also apply to objects. Older
1569 versions of G++ silently ignore the linkage-specification
1577 which is clearly wrong. Therefore, we now treat objects
1579 if (current_lang_depth () == 0)
1581 /* There is no explicit linkage-specification, so we use
1582 the linkage from the previous declaration. */
1583 if (!DECL_LANG_SPECIFIC (newdecl))
1584 retrofit_lang_decl (newdecl);
1585 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1589 error ("previous declaration of %q+#D with %qL linkage",
1590 olddecl, DECL_LANGUAGE (olddecl));
1591 error ("conflicts with new declaration with %qL linkage",
1592 DECL_LANGUAGE (newdecl));
1596 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1598 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1600 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1601 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1604 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1605 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1607 for (; t1 && t1 != void_list_node;
1608 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1609 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1611 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1614 permerror (input_location, "default argument given for parameter %d of %q#D",
1616 permerror (input_location, "after previous specification in %q+#D", olddecl);
1620 error ("default argument given for parameter %d of %q#D",
1622 error ("after previous specification in %q+#D",
1629 /* Do not merge an implicit typedef with an explicit one. In:
1633 typedef class A A __attribute__ ((foo));
1635 the attribute should apply only to the typedef. */
1636 if (TREE_CODE (olddecl) == TYPE_DECL
1637 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1638 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1641 /* If new decl is `static' and an `extern' was seen previously,
1643 warn_extern_redeclared_static (newdecl, olddecl);
1645 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1646 return error_mark_node;
1648 /* We have committed to returning 1 at this point. */
1649 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1651 /* Now that functions must hold information normally held
1652 by field decls, there is extra work to do so that
1653 declaration information does not get destroyed during
1655 if (DECL_VINDEX (olddecl))
1656 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1657 if (DECL_CONTEXT (olddecl))
1658 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1659 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1660 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1661 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1662 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1663 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1664 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1665 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1666 SET_OVERLOADED_OPERATOR_CODE
1667 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1668 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1670 /* Optionally warn about more than one declaration for the same
1671 name, but don't warn about a function declaration followed by a
1673 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1674 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1675 /* Don't warn about extern decl followed by definition. */
1676 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1677 /* Don't warn about friends, let add_friend take care of it. */
1678 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1680 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1681 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1684 if (DECL_DELETED_FN (newdecl))
1686 error ("deleted definition of %qD", newdecl);
1687 error ("after previous declaration %q+D", olddecl);
1691 /* Deal with C++: must preserve virtual function table size. */
1692 if (TREE_CODE (olddecl) == TYPE_DECL)
1694 tree newtype = TREE_TYPE (newdecl);
1695 tree oldtype = TREE_TYPE (olddecl);
1697 if (newtype != error_mark_node && oldtype != error_mark_node
1698 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1699 CLASSTYPE_FRIEND_CLASSES (newtype)
1700 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1702 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1705 /* Copy all the DECL_... slots specified in the new decl
1706 except for any that we copy here from the old type. */
1707 DECL_ATTRIBUTES (newdecl)
1708 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1710 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1714 old_result = DECL_TEMPLATE_RESULT (olddecl);
1715 new_result = DECL_TEMPLATE_RESULT (newdecl);
1716 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1717 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1718 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1719 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1721 DECL_ATTRIBUTES (old_result)
1722 = (*targetm.merge_decl_attributes) (old_result, new_result);
1724 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1726 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1727 && DECL_INITIAL (new_result))
1729 if (DECL_INITIAL (old_result))
1730 DECL_UNINLINABLE (old_result) = 1;
1732 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1733 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1734 DECL_NOT_REALLY_EXTERN (old_result)
1735 = DECL_NOT_REALLY_EXTERN (new_result);
1736 DECL_INTERFACE_KNOWN (old_result)
1737 = DECL_INTERFACE_KNOWN (new_result);
1738 DECL_DECLARED_INLINE_P (old_result)
1739 = DECL_DECLARED_INLINE_P (new_result);
1740 DECL_DISREGARD_INLINE_LIMITS (old_result)
1741 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1746 DECL_DECLARED_INLINE_P (old_result)
1747 |= DECL_DECLARED_INLINE_P (new_result);
1748 DECL_DISREGARD_INLINE_LIMITS (old_result)
1749 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1750 check_redeclaration_exception_specification (newdecl, olddecl);
1754 /* If the new declaration is a definition, update the file and
1755 line information on the declaration, and also make
1756 the old declaration the same definition. */
1757 if (DECL_INITIAL (new_result) != NULL_TREE)
1759 DECL_SOURCE_LOCATION (olddecl)
1760 = DECL_SOURCE_LOCATION (old_result)
1761 = DECL_SOURCE_LOCATION (newdecl);
1762 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1763 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1766 DECL_ARGUMENTS (old_result)
1767 = DECL_ARGUMENTS (new_result);
1768 for (parm = DECL_ARGUMENTS (old_result); parm;
1769 parm = DECL_CHAIN (parm))
1770 DECL_CONTEXT (parm) = old_result;
1779 /* Automatically handles default parameters. */
1780 tree oldtype = TREE_TYPE (olddecl);
1783 /* Merge the data types specified in the two decls. */
1784 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1786 /* If merge_types produces a non-typedef type, just use the old type. */
1787 if (TREE_CODE (newdecl) == TYPE_DECL
1788 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1791 if (TREE_CODE (newdecl) == VAR_DECL)
1793 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1794 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1795 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1796 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1797 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1798 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1800 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1801 if (DECL_LANG_SPECIFIC (olddecl)
1802 && CP_DECL_THREADPRIVATE_P (olddecl))
1804 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1805 if (!DECL_LANG_SPECIFIC (newdecl))
1806 retrofit_lang_decl (newdecl);
1808 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1809 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1813 /* Do this after calling `merge_types' so that default
1814 parameters don't confuse us. */
1815 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1816 check_redeclaration_exception_specification (newdecl, olddecl);
1817 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1819 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1820 check_default_args (newdecl);
1822 /* Lay the type out, unless already done. */
1823 if (! same_type_p (newtype, oldtype)
1824 && TREE_TYPE (newdecl) != error_mark_node
1825 && !(processing_template_decl && uses_template_parms (newdecl)))
1826 layout_type (TREE_TYPE (newdecl));
1828 if ((TREE_CODE (newdecl) == VAR_DECL
1829 || TREE_CODE (newdecl) == PARM_DECL
1830 || TREE_CODE (newdecl) == RESULT_DECL
1831 || TREE_CODE (newdecl) == FIELD_DECL
1832 || TREE_CODE (newdecl) == TYPE_DECL)
1833 && !(processing_template_decl && uses_template_parms (newdecl)))
1834 layout_decl (newdecl, 0);
1836 /* Merge the type qualifiers. */
1837 if (TREE_READONLY (newdecl))
1838 TREE_READONLY (olddecl) = 1;
1839 if (TREE_THIS_VOLATILE (newdecl))
1840 TREE_THIS_VOLATILE (olddecl) = 1;
1841 if (TREE_NOTHROW (newdecl))
1842 TREE_NOTHROW (olddecl) = 1;
1844 /* Merge deprecatedness. */
1845 if (TREE_DEPRECATED (newdecl))
1846 TREE_DEPRECATED (olddecl) = 1;
1848 /* Preserve function specific target and optimization options */
1849 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1851 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1852 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1853 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1854 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1856 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1857 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1858 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1859 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1862 /* Merge the initialization information. */
1863 if (DECL_INITIAL (newdecl) == NULL_TREE
1864 && DECL_INITIAL (olddecl) != NULL_TREE)
1866 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1867 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1868 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1870 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1871 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1875 /* Merge the section attribute.
1876 We want to issue an error if the sections conflict but that must be
1877 done later in decl_attributes since we are called before attributes
1879 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1880 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1882 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1884 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1885 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1886 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1887 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1888 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1889 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1890 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1891 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1892 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1893 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1894 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1895 /* Keep the old RTL. */
1896 COPY_DECL_RTL (olddecl, newdecl);
1898 else if (TREE_CODE (newdecl) == VAR_DECL
1899 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1901 /* Keep the old RTL. We cannot keep the old RTL if the old
1902 declaration was for an incomplete object and the new
1903 declaration is not since many attributes of the RTL will
1905 COPY_DECL_RTL (olddecl, newdecl);
1908 /* If cannot merge, then use the new type and qualifiers,
1909 and don't preserve the old rtl. */
1912 /* Clean out any memory we had of the old declaration. */
1913 tree oldstatic = value_member (olddecl, static_aggregates);
1915 TREE_VALUE (oldstatic) = error_mark_node;
1917 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1918 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1919 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1920 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1923 /* Merge the storage class information. */
1924 merge_weak (newdecl, olddecl);
1926 if (DECL_ONE_ONLY (olddecl))
1927 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1929 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1930 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1931 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1932 if (! DECL_EXTERNAL (olddecl))
1933 DECL_EXTERNAL (newdecl) = 0;
1935 new_template_info = NULL_TREE;
1936 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1938 bool new_redefines_gnu_inline = false;
1940 if (new_defines_function
1941 && ((DECL_INTERFACE_KNOWN (olddecl)
1942 && TREE_CODE (olddecl) == FUNCTION_DECL)
1943 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1944 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1945 == FUNCTION_DECL))))
1949 if (TREE_CODE (fn) == TEMPLATE_DECL)
1950 fn = DECL_TEMPLATE_RESULT (olddecl);
1952 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1955 if (!new_redefines_gnu_inline)
1957 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1958 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1959 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1961 DECL_TEMPLATE_INSTANTIATED (newdecl)
1962 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1963 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1965 /* If the OLDDECL is an instantiation and/or specialization,
1966 then the NEWDECL must be too. But, it may not yet be marked
1967 as such if the caller has created NEWDECL, but has not yet
1968 figured out that it is a redeclaration. */
1969 if (!DECL_USE_TEMPLATE (newdecl))
1970 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1972 /* Don't really know how much of the language-specific
1973 values we should copy from old to new. */
1974 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1975 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1976 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1977 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1979 if (LANG_DECL_HAS_MIN (newdecl))
1981 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1982 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1983 if (DECL_TEMPLATE_INFO (newdecl))
1984 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1985 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1987 /* Only functions have these fields. */
1988 if (TREE_CODE (newdecl) == FUNCTION_DECL
1989 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1991 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1992 olddecl_friend = DECL_FRIEND_P (olddecl);
1993 hidden_friend = (DECL_ANTICIPATED (olddecl)
1994 && DECL_HIDDEN_FRIEND_P (olddecl)
1995 && newdecl_is_friend);
1996 DECL_BEFRIENDING_CLASSES (newdecl)
1997 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1998 DECL_BEFRIENDING_CLASSES (olddecl));
1999 /* DECL_THUNKS is only valid for virtual functions,
2000 otherwise it is a DECL_FRIEND_CONTEXT. */
2001 if (DECL_VIRTUAL_P (newdecl))
2002 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2004 /* Only variables have this field. */
2005 else if (TREE_CODE (newdecl) == VAR_DECL
2006 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2007 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2010 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2014 /* Merge parameter attributes. */
2015 tree oldarg, newarg;
2016 for (oldarg = DECL_ARGUMENTS(olddecl),
2017 newarg = DECL_ARGUMENTS(newdecl);
2019 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2020 DECL_ATTRIBUTES (newarg)
2021 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2022 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2025 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2026 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2028 /* If newdecl is not a specialization, then it is not a
2029 template-related function at all. And that means that we
2030 should have exited above, returning 0. */
2031 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2033 if (DECL_ODR_USED (olddecl))
2034 /* From [temp.expl.spec]:
2036 If a template, a member template or the member of a class
2037 template is explicitly specialized then that
2038 specialization shall be declared before the first use of
2039 that specialization that would cause an implicit
2040 instantiation to take place, in every translation unit in
2041 which such a use occurs. */
2042 error ("explicit specialization of %qD after first use",
2045 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2047 /* Don't propagate visibility from the template to the
2048 specialization here. We'll do that in determine_visibility if
2050 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2052 /* [temp.expl.spec/14] We don't inline explicit specialization
2053 just because the primary template says so. */
2055 else if (new_defines_function && DECL_INITIAL (olddecl))
2057 /* Never inline re-defined extern inline functions.
2058 FIXME: this could be better handled by keeping both
2059 function as separate declarations. */
2060 DECL_UNINLINABLE (newdecl) = 1;
2064 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2065 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2067 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2069 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2070 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2072 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2073 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2074 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2075 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2078 /* Preserve abstractness on cloned [cd]tors. */
2079 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2081 /* Update newdecl's parms to point at olddecl. */
2082 for (parm = DECL_ARGUMENTS (newdecl); parm;
2083 parm = DECL_CHAIN (parm))
2084 DECL_CONTEXT (parm) = olddecl;
2088 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2089 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2090 COPY_DECL_RTL (newdecl, olddecl);
2092 if (! types_match || new_defines_function)
2094 /* These need to be copied so that the names are available.
2095 Note that if the types do match, we'll preserve inline
2096 info and other bits, but if not, we won't. */
2097 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2098 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2100 if (new_defines_function)
2101 /* If defining a function declared with other language
2102 linkage, use the previously declared language linkage. */
2103 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2104 else if (types_match)
2106 /* If redeclaring a builtin function, and not a definition,
2107 it stays built in. */
2108 if (DECL_BUILT_IN (olddecl))
2110 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2111 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2112 /* If we're keeping the built-in definition, keep the rtl,
2113 regardless of declaration matches. */
2114 COPY_DECL_RTL (olddecl, newdecl);
2117 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2118 /* Don't clear out the arguments if we're just redeclaring a
2120 if (DECL_ARGUMENTS (olddecl))
2121 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2124 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2125 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2127 /* Now preserve various other info from the definition. */
2128 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2129 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2130 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2131 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2133 /* Warn about conflicting visibility specifications. */
2134 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2135 && DECL_VISIBILITY_SPECIFIED (newdecl)
2136 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2138 warning_at (input_location, OPT_Wattributes,
2139 "%q+D: visibility attribute ignored because it", newdecl);
2140 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2141 "conflicts with previous declaration here");
2143 /* Choose the declaration which specified visibility. */
2144 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2146 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2147 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2149 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2150 so keep this behavior. */
2151 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2153 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2154 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2156 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2157 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2158 if (TREE_CODE (newdecl) == FIELD_DECL)
2159 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2161 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2162 with that from NEWDECL below. */
2163 if (DECL_LANG_SPECIFIC (olddecl))
2165 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2166 != DECL_LANG_SPECIFIC (newdecl));
2167 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2170 /* Merge the USED information. */
2171 if (TREE_USED (olddecl))
2172 TREE_USED (newdecl) = 1;
2173 else if (TREE_USED (newdecl))
2174 TREE_USED (olddecl) = 1;
2175 if (TREE_CODE (newdecl) == VAR_DECL)
2177 if (DECL_READ_P (olddecl))
2178 DECL_READ_P (newdecl) = 1;
2179 else if (DECL_READ_P (newdecl))
2180 DECL_READ_P (olddecl) = 1;
2182 if (DECL_PRESERVE_P (olddecl))
2183 DECL_PRESERVE_P (newdecl) = 1;
2184 else if (DECL_PRESERVE_P (newdecl))
2185 DECL_PRESERVE_P (olddecl) = 1;
2187 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2191 function_size = sizeof (struct tree_decl_common);
2193 memcpy ((char *) olddecl + sizeof (struct tree_common),
2194 (char *) newdecl + sizeof (struct tree_common),
2195 function_size - sizeof (struct tree_common));
2197 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2198 (char *) newdecl + sizeof (struct tree_decl_common),
2199 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2200 if (new_template_info)
2201 /* If newdecl is a template instantiation, it is possible that
2202 the following sequence of events has occurred:
2204 o A friend function was declared in a class template. The
2205 class template was instantiated.
2207 o The instantiation of the friend declaration was
2208 recorded on the instantiation list, and is newdecl.
2210 o Later, however, instantiate_class_template called pushdecl
2211 on the newdecl to perform name injection. But, pushdecl in
2212 turn called duplicate_decls when it discovered that another
2213 declaration of a global function with the same name already
2216 o Here, in duplicate_decls, we decided to clobber newdecl.
2218 If we're going to do that, we'd better make sure that
2219 olddecl, and not newdecl, is on the list of
2220 instantiations so that if we try to do the instantiation
2221 again we won't get the clobbered declaration. */
2222 reregister_specialization (newdecl,
2228 size_t size = tree_code_size (TREE_CODE (olddecl));
2229 memcpy ((char *) olddecl + sizeof (struct tree_common),
2230 (char *) newdecl + sizeof (struct tree_common),
2231 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2232 switch (TREE_CODE (olddecl))
2242 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2243 (char *) newdecl + sizeof (struct tree_decl_common),
2244 size - sizeof (struct tree_decl_common)
2245 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2249 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2250 (char *) newdecl + sizeof (struct tree_decl_common),
2251 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2252 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2256 DECL_UID (olddecl) = olddecl_uid;
2258 DECL_FRIEND_P (olddecl) = 1;
2261 DECL_ANTICIPATED (olddecl) = 1;
2262 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2265 /* NEWDECL contains the merged attribute lists.
2266 Update OLDDECL to be the same. */
2267 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2269 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2270 so that encode_section_info has a chance to look at the new decl
2271 flags and attributes. */
2272 if (DECL_RTL_SET_P (olddecl)
2273 && (TREE_CODE (olddecl) == FUNCTION_DECL
2274 || (TREE_CODE (olddecl) == VAR_DECL
2275 && TREE_STATIC (olddecl))))
2276 make_decl_rtl (olddecl);
2278 /* The NEWDECL will no longer be needed. Because every out-of-class
2279 declaration of a member results in a call to duplicate_decls,
2280 freeing these nodes represents in a significant savings. */
2286 /* Return zero if the declaration NEWDECL is valid
2287 when the declaration OLDDECL (assumed to be for the same name)
2288 has already been seen.
2289 Otherwise return an error message format string with a %s
2290 where the identifier should go. */
2293 redeclaration_error_message (tree newdecl, tree olddecl)
2295 if (TREE_CODE (newdecl) == TYPE_DECL)
2297 /* Because C++ can put things into name space for free,
2298 constructs like "typedef struct foo { ... } foo"
2299 would look like an erroneous redeclaration. */
2300 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2303 return G_("redefinition of %q#D");
2305 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2307 /* If this is a pure function, its olddecl will actually be
2308 the original initialization to `0' (which we force to call
2309 abort()). Don't complain about redefinition in this case. */
2310 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2311 && DECL_INITIAL (olddecl) == NULL_TREE)
2314 /* If both functions come from different namespaces, this is not
2315 a redeclaration - this is a conflict with a used function. */
2316 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2317 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2318 && ! decls_match (olddecl, newdecl))
2319 return G_("%qD conflicts with used function");
2321 /* We'll complain about linkage mismatches in
2322 warn_extern_redeclared_static. */
2324 /* Defining the same name twice is no good. */
2325 if (DECL_INITIAL (olddecl) != NULL_TREE
2326 && DECL_INITIAL (newdecl) != NULL_TREE)
2328 if (DECL_NAME (olddecl) == NULL_TREE)
2329 return G_("%q#D not declared in class");
2330 else if (!GNU_INLINE_P (olddecl)
2331 || GNU_INLINE_P (newdecl))
2332 return G_("redefinition of %q#D");
2335 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2337 bool olda = GNU_INLINE_P (olddecl);
2338 bool newa = GNU_INLINE_P (newdecl);
2343 return G_("%q+D redeclared inline with "
2344 "%<gnu_inline%> attribute");
2346 return G_("%q+D redeclared inline without "
2347 "%<gnu_inline%> attribute");
2353 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2357 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2359 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2360 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2361 return G_("redefinition of %q#D");
2365 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2366 || (DECL_TEMPLATE_RESULT (newdecl)
2367 == DECL_TEMPLATE_RESULT (olddecl)))
2370 nt = DECL_TEMPLATE_RESULT (newdecl);
2371 if (DECL_TEMPLATE_INFO (nt))
2372 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2373 ot = DECL_TEMPLATE_RESULT (olddecl);
2374 if (DECL_TEMPLATE_INFO (ot))
2375 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2376 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2377 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2378 return G_("redefinition of %q#D");
2380 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2382 bool olda = GNU_INLINE_P (ot);
2383 bool newa = GNU_INLINE_P (nt);
2388 return G_("%q+D redeclared inline with "
2389 "%<gnu_inline%> attribute");
2391 return G_("%q+D redeclared inline without "
2392 "%<gnu_inline%> attribute");
2396 /* Core issue #226 (C++0x):
2398 If a friend function template declaration specifies a
2399 default template-argument, that declaration shall be a
2400 definition and shall be the only declaration of the
2401 function template in the translation unit. */
2402 if ((cxx_dialect != cxx98)
2403 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2404 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2405 /*is_primary=*/1, /*is_partial=*/0,
2406 /*is_friend_decl=*/2))
2407 return G_("redeclaration of friend %q#D "
2408 "may not have default template arguments");
2412 else if (TREE_CODE (newdecl) == VAR_DECL
2413 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2414 && (! DECL_LANG_SPECIFIC (olddecl)
2415 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2416 || DECL_THREAD_LOCAL_P (newdecl)))
2418 /* Only variables can be thread-local, and all declarations must
2419 agree on this property. */
2420 if (DECL_THREAD_LOCAL_P (newdecl))
2421 return G_("thread-local declaration of %q#D follows "
2422 "non-thread-local declaration");
2424 return G_("non-thread-local declaration of %q#D follows "
2425 "thread-local declaration");
2427 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2429 /* The objects have been declared at namespace scope. If either
2430 is a member of an anonymous union, then this is an invalid
2431 redeclaration. For example:
2437 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2438 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2439 return G_("redeclaration of %q#D");
2440 /* If at least one declaration is a reference, there is no
2441 conflict. For example:
2447 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2449 /* Reject two definitions. */
2450 return G_("redefinition of %q#D");
2454 /* Objects declared with block scope: */
2455 /* Reject two definitions, and reject a definition
2456 together with an external reference. */
2457 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2458 return G_("redeclaration of %q#D");
2463 /* Hash and equality functions for the named_label table. */
2466 named_label_entry_hash (const void *data)
2468 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2469 return DECL_UID (ent->label_decl);
2473 named_label_entry_eq (const void *a, const void *b)
2475 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2476 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2477 return ent_a->label_decl == ent_b->label_decl;
2480 /* Create a new label, named ID. */
2483 make_label_decl (tree id, int local_p)
2485 struct named_label_entry *ent;
2489 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2491 DECL_CONTEXT (decl) = current_function_decl;
2492 DECL_MODE (decl) = VOIDmode;
2493 C_DECLARED_LABEL_FLAG (decl) = local_p;
2495 /* Say where one reference is to the label, for the sake of the
2496 error if it is not defined. */
2497 DECL_SOURCE_LOCATION (decl) = input_location;
2499 /* Record the fact that this identifier is bound to this label. */
2500 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2502 /* Create the label htab for the function on demand. */
2504 named_labels = htab_create_ggc (13, named_label_entry_hash,
2505 named_label_entry_eq, NULL);
2507 /* Record this label on the list of labels used in this function.
2508 We do this before calling make_label_decl so that we get the
2509 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2510 ent = ggc_alloc_cleared_named_label_entry ();
2511 ent->label_decl = decl;
2513 slot = htab_find_slot (named_labels, ent, INSERT);
2514 gcc_assert (*slot == NULL);
2520 /* Look for a label named ID in the current function. If one cannot
2521 be found, create one. (We keep track of used, but undefined,
2522 labels, and complain about them at the end of a function.) */
2525 lookup_label (tree id)
2529 timevar_push (TV_NAME_LOOKUP);
2530 /* You can't use labels at global scope. */
2531 if (current_function_decl == NULL_TREE)
2533 error ("label %qE referenced outside of any function", id);
2534 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2537 /* See if we've already got this label. */
2538 decl = IDENTIFIER_LABEL_VALUE (id);
2539 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2540 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2542 decl = make_label_decl (id, /*local_p=*/0);
2543 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2546 /* Declare a local label named ID. */
2549 declare_local_label (tree id)
2552 cp_label_binding *bind;
2554 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2555 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2556 bind = VEC_safe_push (cp_label_binding, gc,
2557 current_binding_level->shadowed_labels, NULL);
2558 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2560 decl = make_label_decl (id, /*local_p=*/1);
2566 /* Returns nonzero if it is ill-formed to jump past the declaration of
2567 DECL. Returns 2 if it's also a real problem. */
2570 decl_jump_unsafe (tree decl)
2572 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2573 with automatic storage duration is not in scope to a point where it is
2574 in scope is ill-formed unless the variable has scalar type, class type
2575 with a trivial default constructor and a trivial destructor, a
2576 cv-qualified version of one of these types, or an array of one of the
2577 preceding types and is declared without an initializer (8.5). */
2578 tree type = TREE_TYPE (decl);
2580 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2581 || type == error_mark_node)
2584 type = strip_array_types (type);
2586 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2587 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2590 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2596 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2599 identify_goto (tree decl, const location_t *locus)
2602 permerror (input_location, "jump to label %qD", decl);
2604 permerror (input_location, "jump to case label");
2606 permerror (*locus, " from here");
2609 /* Check that a single previously seen jump to a newly defined label
2610 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2611 the jump context; NAMES are the names in scope in LEVEL at the jump
2612 context; LOCUS is the source position of the jump or 0. Returns
2613 true if all is well. */
2616 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2617 bool exited_omp, const location_t *locus)
2619 struct cp_binding_level *b;
2620 bool identified = false, saw_eh = false, saw_omp = false;
2624 identify_goto (decl, locus);
2625 error (" exits OpenMP structured block");
2626 identified = saw_omp = true;
2629 for (b = current_binding_level; b ; b = b->level_chain)
2631 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2633 for (new_decls = b->names; new_decls != old_decls;
2634 new_decls = DECL_CHAIN (new_decls))
2636 int problem = decl_jump_unsafe (new_decls);
2642 identify_goto (decl, locus);
2646 error (" crosses initialization of %q+#D", new_decls);
2648 permerror (input_location, " enters scope of %q+#D which has "
2649 "non-trivial destructor", new_decls);
2654 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2658 identify_goto (decl, locus);
2661 if (b->kind == sk_try)
2662 error (" enters try block");
2664 error (" enters catch block");
2667 if (b->kind == sk_omp && !saw_omp)
2671 identify_goto (decl, locus);
2674 error (" enters OpenMP structured block");
2683 check_previous_goto (tree decl, struct named_label_use_entry *use)
2685 check_previous_goto_1 (decl, use->binding_level,
2686 use->names_in_scope, use->in_omp_scope,
2687 &use->o_goto_locus);
2691 check_switch_goto (struct cp_binding_level* level)
2693 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2696 /* Check that a new jump to a label DECL is OK. Called by
2697 finish_goto_stmt. */
2700 check_goto (tree decl)
2702 struct named_label_entry *ent, dummy;
2703 bool saw_catch = false, identified = false;
2707 /* We can't know where a computed goto is jumping.
2708 So we assume that it's OK. */
2709 if (TREE_CODE (decl) != LABEL_DECL)
2712 /* We didn't record any information about this label when we created it,
2713 and there's not much point since it's trivial to analyze as a return. */
2714 if (decl == cdtor_label)
2717 dummy.label_decl = decl;
2718 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2719 gcc_assert (ent != NULL);
2721 /* If the label hasn't been defined yet, defer checking. */
2722 if (! DECL_INITIAL (decl))
2724 struct named_label_use_entry *new_use;
2726 /* Don't bother creating another use if the last goto had the
2727 same data, and will therefore create the same set of errors. */
2729 && ent->uses->names_in_scope == current_binding_level->names)
2732 new_use = ggc_alloc_named_label_use_entry ();
2733 new_use->binding_level = current_binding_level;
2734 new_use->names_in_scope = current_binding_level->names;
2735 new_use->o_goto_locus = input_location;
2736 new_use->in_omp_scope = false;
2738 new_use->next = ent->uses;
2739 ent->uses = new_use;
2743 if (ent->in_try_scope || ent->in_catch_scope
2744 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2746 permerror (input_location, "jump to label %q+D", decl);
2747 permerror (input_location, " from here");
2751 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2753 int u = decl_jump_unsafe (bad);
2755 if (u > 1 && DECL_ARTIFICIAL (bad))
2757 /* Can't skip init of __exception_info. */
2758 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2762 error (" skips initialization of %q+#D", bad);
2764 permerror (input_location, " enters scope of %q+#D which has "
2765 "non-trivial destructor", bad);
2768 if (ent->in_try_scope)
2769 error (" enters try block");
2770 else if (ent->in_catch_scope && !saw_catch)
2771 error (" enters catch block");
2773 if (ent->in_omp_scope)
2774 error (" enters OpenMP structured block");
2775 else if (flag_openmp)
2777 struct cp_binding_level *b;
2778 for (b = current_binding_level; b ; b = b->level_chain)
2780 if (b == ent->binding_level)
2782 if (b->kind == sk_omp)
2786 permerror (input_location, "jump to label %q+D", decl);
2787 permerror (input_location, " from here");
2790 error (" exits OpenMP structured block");
2797 /* Check that a return is ok wrt OpenMP structured blocks.
2798 Called by finish_return_stmt. Returns true if all is well. */
2801 check_omp_return (void)
2803 struct cp_binding_level *b;
2804 for (b = current_binding_level; b ; b = b->level_chain)
2805 if (b->kind == sk_omp)
2807 error ("invalid exit from OpenMP structured block");
2813 /* Define a label, specifying the location in the source file.
2814 Return the LABEL_DECL node for the label. */
2817 define_label (location_t location, tree name)
2819 struct named_label_entry *ent, dummy;
2820 struct cp_binding_level *p;
2823 timevar_push (TV_NAME_LOOKUP);
2825 decl = lookup_label (name);
2827 dummy.label_decl = decl;
2828 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2829 gcc_assert (ent != NULL);
2831 /* After labels, make any new cleanups in the function go into their
2832 own new (temporary) binding contour. */
2833 for (p = current_binding_level;
2834 p->kind != sk_function_parms;
2836 p->more_cleanups_ok = 0;
2838 if (name == get_identifier ("wchar_t"))
2839 permerror (input_location, "label named wchar_t");
2841 if (DECL_INITIAL (decl) != NULL_TREE)
2843 error ("duplicate label %qD", decl);
2844 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2848 struct named_label_use_entry *use;
2850 /* Mark label as having been defined. */
2851 DECL_INITIAL (decl) = error_mark_node;
2852 /* Say where in the source. */
2853 DECL_SOURCE_LOCATION (decl) = location;
2855 ent->binding_level = current_binding_level;
2856 ent->names_in_scope = current_binding_level->names;
2858 for (use = ent->uses; use ; use = use->next)
2859 check_previous_goto (decl, use);
2863 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2868 struct cp_binding_level *level;
2869 struct cp_switch *next;
2870 /* The SWITCH_STMT being built. */
2872 /* A splay-tree mapping the low element of a case range to the high
2873 element, or NULL_TREE if there is no high element. Used to
2874 determine whether or not a new case label duplicates an old case
2875 label. We need a tree, rather than simply a hash table, because
2876 of the GNU case range extension. */
2880 /* A stack of the currently active switch statements. The innermost
2881 switch statement is on the top of the stack. There is no need to
2882 mark the stack for garbage collection because it is only active
2883 during the processing of the body of a function, and we never
2884 collect at that point. */
2886 static struct cp_switch *switch_stack;
2888 /* Called right after a switch-statement condition is parsed.
2889 SWITCH_STMT is the switch statement being parsed. */
2892 push_switch (tree switch_stmt)
2894 struct cp_switch *p = XNEW (struct cp_switch);
2895 p->level = current_binding_level;
2896 p->next = switch_stack;
2897 p->switch_stmt = switch_stmt;
2898 p->cases = splay_tree_new (case_compare, NULL, NULL);
2905 struct cp_switch *cs = switch_stack;
2906 location_t switch_location;
2908 /* Emit warnings as needed. */
2909 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2910 if (!processing_template_decl)
2911 c_do_switch_warnings (cs->cases, switch_location,
2912 SWITCH_STMT_TYPE (cs->switch_stmt),
2913 SWITCH_STMT_COND (cs->switch_stmt));
2915 splay_tree_delete (cs->cases);
2916 switch_stack = switch_stack->next;
2920 /* Note that we've seen a definition of a case label, and complain if this
2921 is a bad place for one. */
2924 finish_case_label (location_t loc, tree low_value, tree high_value)
2927 struct cp_binding_level *p;
2929 if (processing_template_decl)
2933 /* For templates, just add the case label; we'll do semantic
2934 analysis at instantiation-time. */
2935 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2936 return add_stmt (build_case_label (loc, low_value, high_value, label));
2939 /* Find the condition on which this switch statement depends. */
2940 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2941 if (cond && TREE_CODE (cond) == TREE_LIST)
2942 cond = TREE_VALUE (cond);
2944 if (!check_switch_goto (switch_stack->level))
2945 return error_mark_node;
2948 low_value = cxx_constant_value (low_value);
2950 high_value = cxx_constant_value (high_value);
2952 r = c_add_case_label (loc, switch_stack->cases, cond,
2953 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2954 low_value, high_value);
2956 /* After labels, make any new cleanups in the function go into their
2957 own new (temporary) binding contour. */
2958 for (p = current_binding_level;
2959 p->kind != sk_function_parms;
2961 p->more_cleanups_ok = 0;
2966 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2969 typename_hash (const void* k)
2972 const_tree const t = (const_tree) k;
2974 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2975 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2980 typedef struct typename_info {
2988 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2989 really of type `typename_info*' */
2992 typename_compare (const void * k1, const void * k2)
2994 const_tree const t1 = (const_tree) k1;
2995 const typename_info *const t2 = (const typename_info *) k2;
2997 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2998 && TYPE_CONTEXT (t1) == t2->scope
2999 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3000 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3001 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3004 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3005 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3007 Returns the new TYPENAME_TYPE. */
3009 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3012 build_typename_type (tree context, tree name, tree fullname,
3013 enum tag_types tag_type)
3021 if (typename_htab == NULL)
3022 typename_htab = htab_create_ggc (61, &typename_hash,
3023 &typename_compare, NULL);
3025 ti.scope = FROB_CONTEXT (context);
3027 ti.template_id = fullname;
3028 ti.enum_p = tag_type == enum_type;
3029 ti.class_p = (tag_type == class_type
3030 || tag_type == record_type
3031 || tag_type == union_type);
3032 hash = (htab_hash_pointer (ti.scope)
3033 ^ htab_hash_pointer (ti.name));
3035 /* See if we already have this type. */
3036 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3041 /* Build the TYPENAME_TYPE. */
3042 t = cxx_make_type (TYPENAME_TYPE);
3043 TYPE_CONTEXT (t) = ti.scope;
3044 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3045 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3046 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3048 /* Build the corresponding TYPE_DECL. */
3049 d = build_decl (input_location, TYPE_DECL, name, t);
3050 TYPE_NAME (TREE_TYPE (d)) = d;
3051 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3052 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3053 DECL_ARTIFICIAL (d) = 1;
3055 /* Store it in the hash table. */
3058 /* TYPENAME_TYPEs must always be compared structurally, because
3059 they may or may not resolve down to another type depending on
3060 the currently open classes. */
3061 SET_TYPE_STRUCTURAL_EQUALITY (t);
3067 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3068 provided to name the type. Returns an appropriate type, unless an
3069 error occurs, in which case error_mark_node is returned. If we
3070 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3071 return that, rather than the _TYPE it corresponds to, in other
3072 cases we look through the type decl. If TF_ERROR is set, complain
3073 about errors, otherwise be quiet. */
3076 make_typename_type (tree context, tree name, enum tag_types tag_type,
3077 tsubst_flags_t complain)
3083 if (name == error_mark_node
3084 || context == NULL_TREE
3085 || context == error_mark_node)
3086 return error_mark_node;
3090 if (!(TYPE_LANG_SPECIFIC (name)
3091 && (CLASSTYPE_IS_TEMPLATE (name)
3092 || CLASSTYPE_USE_TEMPLATE (name))))
3093 name = TYPE_IDENTIFIER (name);
3095 /* Create a TEMPLATE_ID_EXPR for the type. */
3096 name = build_nt (TEMPLATE_ID_EXPR,
3097 CLASSTYPE_TI_TEMPLATE (name),
3098 CLASSTYPE_TI_ARGS (name));
3100 else if (TREE_CODE (name) == TYPE_DECL)
3101 name = DECL_NAME (name);
3105 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3107 name = TREE_OPERAND (name, 0);
3108 if (TREE_CODE (name) == TEMPLATE_DECL)
3109 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3110 else if (TREE_CODE (name) == OVERLOAD)
3112 error ("%qD is not a type", name);
3113 return error_mark_node;
3116 if (TREE_CODE (name) == TEMPLATE_DECL)
3118 error ("%qD used without template parameters", name);
3119 return error_mark_node;
3121 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3122 gcc_assert (TYPE_P (context));
3124 if (!MAYBE_CLASS_TYPE_P (context))
3126 if (complain & tf_error)
3127 error ("%q#T is not a class", context);
3128 return error_mark_node;
3131 /* When the CONTEXT is a dependent type, NAME could refer to a
3132 dependent base class of CONTEXT. But look inside it anyway
3133 if CONTEXT is a currently open scope, in case it refers to a
3134 member of the current instantiation or a non-dependent base;
3135 lookup will stop when we hit a dependent base. */
3136 if (!dependent_scope_p (context))
3137 /* We should only set WANT_TYPE when we're a nested typename type.
3138 Then we can give better diagnostics if we find a non-type. */
3139 t = lookup_field (context, name, 2, /*want_type=*/true);
3143 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3144 return build_typename_type (context, name, fullname, tag_type);
3146 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3150 if (complain & tf_error)
3151 error (want_template ? "no class template named %q#T in %q#T"
3152 : "no type named %q#T in %q#T", name, context);
3153 return error_mark_node;
3156 /* Pull out the template from an injected-class-name (or multiple). */
3158 t = maybe_get_template_decl_from_type_decl (t);
3160 if (TREE_CODE (t) == TREE_LIST)
3162 if (complain & tf_error)
3164 error ("lookup of %qT in %qT is ambiguous", name, context);
3165 print_candidates (t);
3167 return error_mark_node;
3170 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3172 if (complain & tf_error)
3173 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3175 return error_mark_node;
3177 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3179 if (complain & tf_error)
3180 error ("%<typename %T::%D%> names %q#T, which is not a type",
3182 return error_mark_node;
3185 if (complain & tf_error)
3186 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3188 /* If we are currently parsing a template and if T is a typedef accessed
3189 through CONTEXT then we need to remember and check access of T at
3190 template instantiation time. */
3191 add_typedef_to_current_template_for_access_check (t, context, input_location);
3194 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3196 /*entering_scope=*/0,
3197 tf_warning_or_error | tf_user);
3199 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3205 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3206 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3207 in which case error_mark_node is returned.
3209 If PARM_LIST is non-NULL, also make sure that the template parameter
3210 list of TEMPLATE_DECL matches.
3212 If COMPLAIN zero, don't complain about any errors that occur. */
3215 make_unbound_class_template (tree context, tree name, tree parm_list,
3216 tsubst_flags_t complain)
3222 name = TYPE_IDENTIFIER (name);
3223 else if (DECL_P (name))
3224 name = DECL_NAME (name);
3225 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3227 if (!dependent_type_p (context)
3228 || currently_open_class (context))
3230 tree tmpl = NULL_TREE;
3232 if (MAYBE_CLASS_TYPE_P (context))
3233 tmpl = lookup_field (context, name, 0, false);
3235 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3236 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3238 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3240 if (complain & tf_error)
3241 error ("no class template named %q#T in %q#T", name, context);
3242 return error_mark_node;
3246 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3248 if (complain & tf_error)
3250 error ("template parameters do not match template");
3251 error ("%q+D declared here", tmpl);
3253 return error_mark_node;
3256 if (complain & tf_error)
3257 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3262 /* Build the UNBOUND_CLASS_TEMPLATE. */
3263 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3264 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3265 TREE_TYPE (t) = NULL_TREE;
3266 SET_TYPE_STRUCTURAL_EQUALITY (t);
3268 /* Build the corresponding TEMPLATE_DECL. */
3269 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3270 TYPE_NAME (TREE_TYPE (d)) = d;
3271 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3272 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3273 DECL_ARTIFICIAL (d) = 1;
3274 DECL_TEMPLATE_PARMS (d) = parm_list;
3281 /* Push the declarations of builtin types into the namespace.
3282 RID_INDEX is the index of the builtin type in the array
3283 RID_POINTERS. NAME is the name used when looking up the builtin
3284 type. TYPE is the _TYPE node for the builtin type. */
3287 record_builtin_type (enum rid rid_index,
3291 tree rname = NULL_TREE, tname = NULL_TREE;
3292 tree tdecl = NULL_TREE;
3294 if ((int) rid_index < (int) RID_MAX)
3295 rname = ridpointers[(int) rid_index];
3297 tname = get_identifier (name);
3299 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3300 eliminated. Built-in types should not be looked up name; their
3301 names are keywords that the parser can recognize. However, there
3302 is code in c-common.c that uses identifier_global_value to look
3303 up built-in types by name. */
3306 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3307 DECL_ARTIFICIAL (tdecl) = 1;
3308 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3314 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3315 DECL_ARTIFICIAL (tdecl) = 1;
3317 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3320 if (!TYPE_NAME (type))
3321 TYPE_NAME (type) = tdecl;
3324 debug_hooks->type_decl (tdecl, 0);
3327 /* Record one of the standard Java types.
3328 * Declare it as having the given NAME.
3329 * If SIZE > 0, it is the size of one of the integral types;
3330 * otherwise it is the negative of the size of one of the other types. */
3333 record_builtin_java_type (const char* name, int size)
3338 type = build_nonstandard_integer_type (size, 0);
3339 type = build_distinct_type_copy (type);
3341 else if (size > -32)
3344 /* "__java_char" or ""__java_boolean". */
3345 type = build_nonstandard_integer_type (-size, 1);
3346 type = build_distinct_type_copy (type);
3347 /* Get the signed type cached and attached to the unsigned type,
3348 so it doesn't get garbage-collected at "random" times,
3349 causing potential codegen differences out of different UIDs
3350 and different alias set numbers. */
3351 stype = build_nonstandard_integer_type (-size, 0);
3352 stype = build_distinct_type_copy (stype);
3353 TREE_CHAIN (type) = stype;
3354 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3357 { /* "__java_float" or ""__java_double". */
3358 type = make_node (REAL_TYPE);
3359 TYPE_PRECISION (type) = - size;
3362 record_builtin_type (RID_MAX, name, type);
3363 decl = TYPE_NAME (type);
3365 /* Suppress generate debug symbol entries for these types,
3366 since for normal C++ they are just clutter.
3367 However, push_lang_context undoes this if extern "Java" is seen. */
3368 DECL_IGNORED_P (decl) = 1;
3370 TYPE_FOR_JAVA (type) = 1;
3374 /* Push a type into the namespace so that the back ends ignore it. */
3377 record_unknown_type (tree type, const char* name)
3379 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3380 TYPE_DECL, get_identifier (name), type));
3381 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3382 DECL_IGNORED_P (decl) = 1;
3383 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3384 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3385 TYPE_ALIGN (type) = 1;
3386 TYPE_USER_ALIGN (type) = 0;
3387 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3390 /* A string for which we should create an IDENTIFIER_NODE at
3393 typedef struct predefined_identifier
3395 /* The name of the identifier. */
3396 const char *const name;
3397 /* The place where the IDENTIFIER_NODE should be stored. */
3399 /* Nonzero if this is the name of a constructor or destructor. */
3400 const int ctor_or_dtor_p;
3401 } predefined_identifier;
3403 /* Create all the predefined identifiers. */
3406 initialize_predefined_identifiers (void)
3408 const predefined_identifier *pid;
3410 /* A table of identifiers to create at startup. */
3411 static const predefined_identifier predefined_identifiers[] = {
3412 { "C++", &lang_name_cplusplus, 0 },
3413 { "C", &lang_name_c, 0 },
3414 { "Java", &lang_name_java, 0 },
3415 /* Some of these names have a trailing space so that it is
3416 impossible for them to conflict with names written by users. */
3417 { "__ct ", &ctor_identifier, 1 },
3418 { "__base_ctor ", &base_ctor_identifier, 1 },
3419 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3420 { "__dt ", &dtor_identifier, 1 },
3421 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3422 { "__base_dtor ", &base_dtor_identifier, 1 },
3423 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3424 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3425 { "nelts", &nelts_identifier, 0 },
3426 { THIS_NAME, &this_identifier, 0 },
3427 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3428 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3429 { "_vptr", &vptr_identifier, 0 },
3430 { "__vtt_parm", &vtt_parm_identifier, 0 },
3431 { "::", &global_scope_name, 0 },
3432 { "std", &std_identifier, 0 },
3436 for (pid = predefined_identifiers; pid->name; ++pid)
3438 *pid->node = get_identifier (pid->name);
3439 if (pid->ctor_or_dtor_p)
3440 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3444 /* Create the predefined scalar types of C,
3445 and some nodes representing standard constants (0, 1, (void *)0).
3446 Initialize the global binding level.
3447 Make definitions for built-in primitive functions. */
3450 cxx_init_decl_processing (void)
3453 tree void_ftype_ptr;
3455 build_common_tree_nodes (flag_signed_char);
3457 /* Create all the identifiers we need. */
3458 initialize_predefined_identifiers ();
3460 /* Create the global variables. */
3461 push_to_top_level ();
3463 current_function_decl = NULL_TREE;
3464 current_binding_level = NULL;
3465 /* Enter the global namespace. */
3466 gcc_assert (global_namespace == NULL_TREE);
3467 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3469 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3470 TREE_PUBLIC (global_namespace) = 1;
3471 begin_scope (sk_namespace, global_namespace);
3473 current_lang_name = NULL_TREE;
3475 if (flag_visibility_ms_compat)
3476 default_visibility = VISIBILITY_HIDDEN;
3479 current_lang_name = lang_name_c;
3481 /* Create the `std' namespace. */
3482 push_namespace (std_identifier);
3483 std_node = current_namespace;
3486 c_common_nodes_and_builtins ();
3488 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3489 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3490 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3491 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3492 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3493 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3494 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3495 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3497 integer_two_node = build_int_cst (NULL_TREE, 2);
3499 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3500 truthvalue_type_node = boolean_type_node;
3501 truthvalue_false_node = boolean_false_node;
3502 truthvalue_true_node = boolean_true_node;
3504 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3505 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3506 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3509 record_builtin_type (RID_MAX, NULL, string_type_node);
3512 delta_type_node = ptrdiff_type_node;
3513 vtable_index_type = ptrdiff_type_node;
3515 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3516 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3517 void_ftype_ptr = build_function_type_list (void_type_node,
3518 ptr_type_node, NULL_TREE);
3520 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3522 /* C++ extensions */
3524 unknown_type_node = make_node (LANG_TYPE);
3525 record_unknown_type (unknown_type_node, "unknown type");
3527 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3528 TREE_TYPE (unknown_type_node) = unknown_type_node;
3530 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3532 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3533 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3535 init_list_type_node = make_node (LANG_TYPE);
3536 record_unknown_type (init_list_type_node, "init list");
3539 /* Make sure we get a unique function type, so we can give
3540 its pointer type a name. (This wins for gdb.) */
3541 tree vfunc_type = make_node (FUNCTION_TYPE);
3542 TREE_TYPE (vfunc_type) = integer_type_node;
3543 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3544 layout_type (vfunc_type);
3546 vtable_entry_type = build_pointer_type (vfunc_type);
3548 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3551 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3552 layout_type (vtbl_type_node);
3553 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3554 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3555 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3556 layout_type (vtbl_ptr_type_node);
3557 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3559 push_namespace (get_identifier ("__cxxabiv1"));
3560 abi_node = current_namespace;
3563 global_type_node = make_node (LANG_TYPE);
3564 record_unknown_type (global_type_node, "global type");
3567 current_lang_name = lang_name_cplusplus;
3570 tree newtype, deltype;
3571 tree ptr_ftype_sizetype;
3575 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3576 if (cxx_dialect == cxx98)
3579 tree bad_alloc_type_node;
3580 tree bad_alloc_decl;
3582 push_namespace (std_identifier);
3583 bad_alloc_id = get_identifier ("bad_alloc");
3584 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3585 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3587 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3588 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3592 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3595 new_eh_spec = noexcept_false_spec;
3597 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3598 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3599 push_cp_library_fn (NEW_EXPR, newtype);
3600 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3601 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3602 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3604 nullptr_type_node = make_node (NULLPTR_TYPE);
3605 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3606 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3607 TYPE_UNSIGNED (nullptr_type_node) = 1;
3608 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3609 SET_TYPE_MODE (nullptr_type_node, Pmode);
3610 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3611 nullptr_node = build_int_cst (nullptr_type_node, 0);
3615 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3617 /* Perform other language dependent initializations. */
3618 init_class_processing ();
3619 init_rtti_processing ();
3620 init_template_processing ();
3622 if (flag_exceptions)
3623 init_exception_processing ();
3625 if (! supports_one_only ())
3628 make_fname_decl = cp_make_fname_decl;
3629 start_fname_decls ();
3631 /* Show we use EH for cleanups. */
3632 if (flag_exceptions)
3633 using_eh_for_cleanups ();
3636 /* Generate an initializer for a function naming variable from
3637 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3638 filled in with the type of the init. */
3641 cp_fname_init (const char* name, tree *type_p)
3643 tree domain = NULL_TREE;
3645 tree init = NULL_TREE;
3650 length = strlen (name);
3651 domain = build_index_type (size_int (length));
3652 init = build_string (length + 1, name);
3655 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3656 type = build_cplus_array_type (type, domain);
3661 TREE_TYPE (init) = type;
3663 init = error_mark_node;
3668 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3669 the decl, LOC is the location to give the decl, NAME is the
3670 initialization string and TYPE_DEP indicates whether NAME depended
3671 on the type of the function. We make use of that to detect
3672 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3673 at the point of first use, so we mustn't push the decl now. */
3676 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3678 const char *const name = (type_dep && processing_template_decl
3679 ? NULL : fname_as_string (type_dep));
3681 tree init = cp_fname_init (name, &type);
3682 tree decl = build_decl (loc, VAR_DECL, id, type);
3685 free (CONST_CAST (char *, name));
3687 /* As we're using pushdecl_with_scope, we must set the context. */
3688 DECL_CONTEXT (decl) = current_function_decl;
3689 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3691 TREE_STATIC (decl) = 1;
3692 TREE_READONLY (decl) = 1;
3693 DECL_ARTIFICIAL (decl) = 1;
3695 TREE_USED (decl) = 1;
3697 if (current_function_decl)
3699 struct cp_binding_level *b = current_binding_level;
3700 if (b->kind == sk_function_parms)
3701 return error_mark_node;
3702 while (b->level_chain->kind != sk_function_parms)
3704 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3705 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3706 LOOKUP_ONLYCONVERTING);
3709 pushdecl_top_level_and_finish (decl, init);
3715 builtin_function_1 (tree decl, tree context, bool is_global)
3717 tree id = DECL_NAME (decl);
3718 const char *name = IDENTIFIER_POINTER (id);
3720 retrofit_lang_decl (decl);
3722 DECL_ARTIFICIAL (decl) = 1;
3723 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3724 SET_DECL_LANGUAGE (decl, lang_c);
3725 /* Runtime library routines are, by definition, available in an
3726 external shared object. */
3727 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3728 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3730 DECL_CONTEXT (decl) = context;
3733 pushdecl_top_level (decl);
3737 /* A function in the user's namespace should have an explicit
3738 declaration before it is used. Mark the built-in function as
3739 anticipated but not actually declared. */
3740 if (name[0] != '_' || name[1] != '_')
3741 DECL_ANTICIPATED (decl) = 1;
3742 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3744 size_t len = strlen (name);
3746 /* Treat __*_chk fortification functions as anticipated as well,
3747 unless they are __builtin_*. */
3748 if (len > strlen ("___chk")
3749 && memcmp (name + len - strlen ("_chk"),
3750 "_chk", strlen ("_chk") + 1) == 0)
3751 DECL_ANTICIPATED (decl) = 1;
3758 cxx_builtin_function (tree decl)
3760 tree id = DECL_NAME (decl);
3761 const char *name = IDENTIFIER_POINTER (id);
3762 /* All builtins that don't begin with an '_' should additionally
3763 go in the 'std' namespace. */
3766 tree decl2 = copy_node(decl);
3767 push_namespace (std_identifier);
3768 builtin_function_1 (decl2, std_node, false);
3772 return builtin_function_1 (decl, NULL_TREE, false);
3775 /* Like cxx_builtin_function, but guarantee the function is added to the global
3776 scope. This is to allow function specific options to add new machine
3777 dependent builtins when the target ISA changes via attribute((target(...)))
3778 which saves space on program startup if the program does not use non-generic
3782 cxx_builtin_function_ext_scope (tree decl)
3785 tree id = DECL_NAME (decl);
3786 const char *name = IDENTIFIER_POINTER (id);
3787 /* All builtins that don't begin with an '_' should additionally
3788 go in the 'std' namespace. */
3791 tree decl2 = copy_node(decl);
3792 push_namespace (std_identifier);
3793 builtin_function_1 (decl2, std_node, true);
3797 return builtin_function_1 (decl, NULL_TREE, true);
3800 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3801 function. Not called directly. */
3804 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3806 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3807 DECL_EXTERNAL (fn) = 1;
3808 TREE_PUBLIC (fn) = 1;
3809 DECL_ARTIFICIAL (fn) = 1;
3810 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3811 SET_DECL_LANGUAGE (fn, lang_c);
3812 /* Runtime library routines are, by definition, available in an
3813 external shared object. */
3814 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3815 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3819 /* Returns the _DECL for a library function with C linkage.
3820 We assume that such functions never throw; if this is incorrect,
3821 callers should unset TREE_NOTHROW. */
3824 build_library_fn (tree name, tree type)
3826 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3827 TREE_NOTHROW (fn) = 1;
3831 /* Returns the _DECL for a library function with C++ linkage. */
3834 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3836 tree fn = build_library_fn_1 (name, operator_code, type);
3837 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3838 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3839 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3843 /* Like build_library_fn, but takes a C string instead of an
3847 build_library_fn_ptr (const char* name, tree type)
3849 return build_library_fn (get_identifier (name), type);
3852 /* Like build_cp_library_fn, but takes a C string instead of an
3856 build_cp_library_fn_ptr (const char* name, tree type)
3858 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3861 /* Like build_library_fn, but also pushes the function so that we will
3862 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3863 may throw exceptions listed in RAISES. */
3866 push_library_fn (tree name, tree type, tree raises)
3871 type = build_exception_variant (type, raises);
3873 fn = build_library_fn (name, type);
3874 pushdecl_top_level (fn);
3878 /* Like build_cp_library_fn, but also pushes the function so that it
3879 will be found by normal lookup. */
3882 push_cp_library_fn (enum tree_code operator_code, tree type)
3884 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3891 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3895 push_void_library_fn (tree name, tree parmtypes)
3897 tree type = build_function_type (void_type_node, parmtypes);
3898 return push_library_fn (name, type, NULL_TREE);
3901 /* Like push_library_fn, but also note that this function throws
3902 and does not return. Used for __throw_foo and the like. */
3905 push_throw_library_fn (tree name, tree type)
3907 tree fn = push_library_fn (name, type, NULL_TREE);
3908 TREE_THIS_VOLATILE (fn) = 1;
3909 TREE_NOTHROW (fn) = 0;
3913 /* When we call finish_struct for an anonymous union, we create
3914 default copy constructors and such. But, an anonymous union
3915 shouldn't have such things; this function undoes the damage to the
3916 anonymous union type T.
3918 (The reason that we create the synthesized methods is that we don't
3919 distinguish `union { int i; }' from `typedef union { int i; } U'.
3920 The first is an anonymous union; the second is just an ordinary
3924 fixup_anonymous_aggr (tree t)
3928 /* Wipe out memory of synthesized methods. */
3929 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3930 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3931 TYPE_HAS_COPY_CTOR (t) = 0;
3932 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3933 TYPE_HAS_COPY_ASSIGN (t) = 0;
3934 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3936 /* Splice the implicitly generated functions out of the TYPE_METHODS
3938 q = &TYPE_METHODS (t);
3941 if (DECL_ARTIFICIAL (*q))
3942 *q = TREE_CHAIN (*q);
3944 q = &DECL_CHAIN (*q);
3947 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3948 if (TYPE_METHODS (t))
3950 tree decl = TYPE_MAIN_DECL (t);
3952 if (TREE_CODE (t) != UNION_TYPE)
3953 error_at (DECL_SOURCE_LOCATION (decl),
3954 "an anonymous struct cannot have function members");
3956 error_at (DECL_SOURCE_LOCATION (decl),
3957 "an anonymous union cannot have function members");
3960 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3961 assignment operators (because they cannot have these methods themselves).
3962 For anonymous unions this is already checked because they are not allowed
3963 in any union, otherwise we have to check it. */
3964 if (TREE_CODE (t) != UNION_TYPE)
3968 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3969 if (TREE_CODE (field) == FIELD_DECL)
3971 type = TREE_TYPE (field);
3972 if (CLASS_TYPE_P (type))
3974 if (TYPE_NEEDS_CONSTRUCTING (type))
3975 error ("member %q+#D with constructor not allowed "
3976 "in anonymous aggregate", field);
3977 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3978 error ("member %q+#D with destructor not allowed "
3979 "in anonymous aggregate", field);
3980 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3981 error ("member %q+#D with copy assignment operator "
3982 "not allowed in anonymous aggregate", field);
3988 /* Make sure that a declaration with no declarator is well-formed, i.e.
3989 just declares a tagged type or anonymous union.
3991 Returns the type declared; or NULL_TREE if none. */
3994 check_tag_decl (cp_decl_specifier_seq *declspecs)
3996 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3997 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3998 /* If a class, struct, or enum type is declared by the DECLSPECS
3999 (i.e, if a class-specifier, enum-specifier, or non-typename
4000 elaborated-type-specifier appears in the DECLSPECS),
4001 DECLARED_TYPE is set to the corresponding type. */
4002 tree declared_type = NULL_TREE;
4003 bool error_p = false;
4005 if (declspecs->multiple_types_p)
4006 error ("multiple types in one declaration");
4007 else if (declspecs->redefined_builtin_type)
4009 if (!in_system_header)
4010 permerror (input_location, "redeclaration of C++ built-in type %qT",
4011 declspecs->redefined_builtin_type);
4016 && TYPE_P (declspecs->type)
4017 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4018 && MAYBE_CLASS_TYPE_P (declspecs->type))
4019 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4020 declared_type = declspecs->type;
4021 else if (declspecs->type == error_mark_node)
4023 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4024 permerror (input_location, "declaration does not declare anything");
4025 /* Check for an anonymous union. */
4026 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4027 && TYPE_ANONYMOUS_P (declared_type))
4029 /* 7/3 In a simple-declaration, the optional init-declarator-list
4030 can be omitted only when declaring a class (clause 9) or
4031 enumeration (7.2), that is, when the decl-specifier-seq contains
4032 either a class-specifier, an elaborated-type-specifier with
4033 a class-key (9.1), or an enum-specifier. In these cases and
4034 whenever a class-specifier or enum-specifier is present in the
4035 decl-specifier-seq, the identifiers in these specifiers are among
4036 the names being declared by the declaration (as class-name,
4037 enum-names, or enumerators, depending on the syntax). In such
4038 cases, and except for the declaration of an unnamed bit-field (9.6),
4039 the decl-specifier-seq shall introduce one or more names into the
4040 program, or shall redeclare a name introduced by a previous
4041 declaration. [Example:
4042 enum { }; // ill-formed
4043 typedef class { }; // ill-formed
4047 error ("missing type-name in typedef-declaration");
4050 /* Anonymous unions are objects, so they can have specifiers. */;
4051 SET_ANON_AGGR_TYPE_P (declared_type);
4053 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4054 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4059 if (declspecs->specs[(int)ds_inline]
4060 || declspecs->specs[(int)ds_virtual])
4061 error ("%qs can only be specified for functions",
4062 declspecs->specs[(int)ds_inline]
4063 ? "inline" : "virtual");
4065 && (!current_class_type
4066 || current_scope () != current_class_type))
4067 error ("%<friend%> can only be specified inside a class");
4068 else if (declspecs->specs[(int)ds_explicit])
4069 error ("%<explicit%> can only be specified for constructors");
4070 else if (declspecs->storage_class)
4071 error ("a storage class can only be specified for objects "
4073 else if (declspecs->specs[(int)ds_const]
4074 || declspecs->specs[(int)ds_volatile]
4075 || declspecs->specs[(int)ds_restrict]
4076 || declspecs->specs[(int)ds_thread])
4077 error ("qualifiers can only be specified for objects "
4079 else if (saw_typedef)
4080 warning (0, "%<typedef%> was ignored in this declaration");
4081 else if (declspecs->specs[(int) ds_constexpr])
4082 error ("%<constexpr%> cannot be used for type declarations");
4085 return declared_type;
4088 /* Called when a declaration is seen that contains no names to declare.
4089 If its type is a reference to a structure, union or enum inherited
4090 from a containing scope, shadow that tag name for the current scope
4091 with a forward reference.
4092 If its type defines a new named structure or union
4093 or defines an enum, it is valid but we need not do anything here.
4094 Otherwise, it is an error.
4096 C++: may have to grok the declspecs to learn about static,
4097 complain for anonymous unions.
4099 Returns the TYPE declared -- or NULL_TREE if none. */
4102 shadow_tag (cp_decl_specifier_seq *declspecs)
4104 tree t = check_tag_decl (declspecs);
4109 if (declspecs->attributes)
4111 warning (0, "attribute ignored in declaration of %q+#T", t);
4112 warning (0, "attribute for %q+#T must follow the %qs keyword",
4113 t, class_key_or_enum_as_string (t));
4117 if (maybe_process_partial_specialization (t) == error_mark_node)
4120 /* This is where the variables in an anonymous union are
4121 declared. An anonymous union declaration looks like:
4123 because there is no declarator after the union, the parser
4124 sends that declaration here. */
4125 if (ANON_AGGR_TYPE_P (t))
4127 fixup_anonymous_aggr (t);
4129 if (TYPE_FIELDS (t))
4131 tree decl = grokdeclarator (/*declarator=*/NULL,
4132 declspecs, NORMAL, 0, NULL);
4133 finish_anon_union (decl);
4140 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4143 groktypename (cp_decl_specifier_seq *type_specifiers,
4144 const cp_declarator *declarator,
4145 bool is_template_arg)
4149 enum decl_context context
4150 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4151 attrs = type_specifiers->attributes;
4152 type_specifiers->attributes = NULL_TREE;
4153 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4154 if (attrs && type != error_mark_node)
4156 if (CLASS_TYPE_P (type))
4157 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4158 "outside of definition", type);
4159 else if (MAYBE_CLASS_TYPE_P (type))
4160 /* A template type parameter or other dependent type. */
4161 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4162 "type %qT without an associated declaration", type);
4164 cplus_decl_attributes (&type, attrs, 0);
4169 /* Process a DECLARATOR for a function-scope variable declaration,
4170 namespace-scope variable declaration, or function declaration.
4171 (Function definitions go through start_function; class member
4172 declarations appearing in the body of the class go through
4173 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4174 If an error occurs, the error_mark_node is returned instead.
4176 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4177 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4178 for an explicitly defaulted function, or SD_DELETED for an explicitly
4179 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4180 implicitly initialized via a default constructor. ATTRIBUTES and
4181 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4182 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4183 set, the caller is responsible for calling pop_scope. */
4186 start_decl (const cp_declarator *declarator,
4187 cp_decl_specifier_seq *declspecs,
4190 tree prefix_attributes,
4191 tree *pushed_scope_p)
4199 *pushed_scope_p = NULL_TREE;
4201 /* An object declared as __attribute__((deprecated)) suppresses
4202 warnings of uses of other deprecated items. */
4203 if (lookup_attribute ("deprecated", attributes))
4204 deprecated_state = DEPRECATED_SUPPRESS;
4206 attributes = chainon (attributes, prefix_attributes);
4208 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4211 deprecated_state = DEPRECATED_NORMAL;
4213 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4214 || decl == error_mark_node)
4215 return error_mark_node;
4217 context = CP_DECL_CONTEXT (decl);
4218 if (context != global_namespace)
4219 *pushed_scope_p = push_scope (context);
4222 /* Is it valid for this decl to have an initializer at all?
4223 If not, set INITIALIZED to zero, which will indirectly
4224 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4225 switch (TREE_CODE (decl))
4228 error ("typedef %qD is initialized (use decltype instead)", decl);
4229 return error_mark_node;
4232 if (initialized == SD_DELETED)
4233 /* We'll handle the rest of the semantics later, but we need to
4234 set this now so it's visible to duplicate_decls. */
4235 DECL_DELETED_FN (decl) = 1;
4244 if (! toplevel_bindings_p ()
4245 && DECL_EXTERNAL (decl))
4246 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4248 DECL_EXTERNAL (decl) = 0;
4249 if (toplevel_bindings_p ())
4250 TREE_STATIC (decl) = 1;
4252 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4254 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4255 record_key_method_defined (decl);
4257 /* If this is a typedef that names the class for linkage purposes
4258 (7.1.3p8), apply any attributes directly to the type. */
4259 if (TREE_CODE (decl) == TYPE_DECL
4260 && TAGGED_TYPE_P (TREE_TYPE (decl))
4261 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4262 flags = ATTR_FLAG_TYPE_IN_PLACE;
4266 /* Set attributes here so if duplicate decl, will have proper attributes. */
4267 cplus_decl_attributes (&decl, attributes, flags);
4269 /* Dllimported symbols cannot be defined. Static data members (which
4270 can be initialized in-class and dllimported) go through grokfield,
4271 not here, so we don't need to exclude those decls when checking for
4273 if (initialized && DECL_DLLIMPORT_P (decl))
4275 error ("definition of %q#D is marked %<dllimport%>", decl);
4276 DECL_DLLIMPORT_P (decl) = 0;
4279 /* If #pragma weak was used, mark the decl weak now. */
4280 maybe_apply_pragma_weak (decl);
4282 if (TREE_CODE (decl) == FUNCTION_DECL
4283 && DECL_DECLARED_INLINE_P (decl)
4284 && DECL_UNINLINABLE (decl)
4285 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4286 warning (0, "inline function %q+D given attribute noinline", decl);
4288 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4290 if (TREE_CODE (decl) == VAR_DECL)
4292 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4293 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4294 error ("%q#D is not a static member of %q#T", decl, context);
4297 if (DECL_CONTEXT (field) != context)
4299 if (!same_type_p (DECL_CONTEXT (field), context))
4300 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4301 "to be defined as %<%T::%D%>",
4302 DECL_CONTEXT (field), DECL_NAME (decl),
4303 context, DECL_NAME (decl));
4304 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4306 if (processing_specialization
4307 && template_class_depth (context) == 0
4308 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4309 error ("template header not allowed in member definition "
4310 "of explicitly specialized class");
4311 /* Static data member are tricky; an in-class initialization
4312 still doesn't provide a definition, so the in-class
4313 declaration will have DECL_EXTERNAL set, but will have an
4314 initialization. Thus, duplicate_decls won't warn
4315 about this situation, and so we check here. */
4316 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4317 error ("duplicate initialization of %qD", decl);
4318 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4320 if (declspecs->specs[(int) ds_constexpr]
4321 && !DECL_DECLARED_CONSTEXPR_P (field))
4322 error ("%qD declared %<constexpr%> outside its class", field);
4327 tree field = check_classfn (context, decl,
4328 (processing_template_decl
4329 > template_class_depth (context))
4330 ? current_template_parms
4332 if (field && field != error_mark_node
4333 && duplicate_decls (decl, field,
4334 /*newdecl_is_friend=*/false))
4338 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4339 DECL_IN_AGGR_P (decl) = 0;
4340 /* Do not mark DECL as an explicit specialization if it was not
4341 already marked as an instantiation; a declaration should
4342 never be marked as a specialization unless we know what
4343 template is being specialized. */
4344 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4346 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4348 /* [temp.expl.spec] An explicit specialization of a static data
4349 member of a template is a definition if the declaration
4350 includes an initializer; otherwise, it is a declaration.
4352 We check for processing_specialization so this only applies
4353 to the new specialization syntax. */
4354 if (!initialized && processing_specialization)
4355 DECL_EXTERNAL (decl) = 1;
4358 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4359 /* Aliases are definitions. */
4361 permerror (input_location, "declaration of %q#D outside of class is not definition",
4365 was_public = TREE_PUBLIC (decl);
4367 /* Enter this declaration into the symbol table. */
4368 decl = maybe_push_decl (decl);
4370 if (processing_template_decl)
4371 decl = push_template_decl (decl);
4372 if (decl == error_mark_node)
4373 return error_mark_node;
4375 /* Tell the back end to use or not use .common as appropriate. If we say
4376 -fconserve-space, we want this to save .data space, at the expense of
4377 wrong semantics. If we say -fno-conserve-space, we want this to
4378 produce errors about redefs; to do this we force variables into the
4380 if (flag_conserve_space
4381 && TREE_CODE (decl) == VAR_DECL
4382 && TREE_PUBLIC (decl)
4383 && !DECL_THREAD_LOCAL_P (decl)
4384 && !have_global_bss_p ())
4385 DECL_COMMON (decl) = 1;
4387 if (TREE_CODE (decl) == VAR_DECL
4388 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4389 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4391 /* This is a const variable with implicit 'static'. Set
4392 DECL_THIS_STATIC so we can tell it from variables that are
4393 !TREE_PUBLIC because of the anonymous namespace. */
4394 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4395 DECL_THIS_STATIC (decl) = 1;
4398 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4399 start_decl_1 (decl, initialized);
4404 /* Process the declaration of a variable DECL. INITIALIZED is true
4405 iff DECL is explicitly initialized. (INITIALIZED is false if the
4406 variable is initialized via an implicitly-called constructor.)
4407 This function must be called for ordinary variables (including, for
4408 example, implicit instantiations of templates), but must not be
4409 called for template declarations. */
4412 start_decl_1 (tree decl, bool initialized)
4416 bool aggregate_definition_p;
4418 gcc_assert (!processing_template_decl);
4420 if (error_operand_p (decl))
4423 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4425 type = TREE_TYPE (decl);
4426 complete_p = COMPLETE_TYPE_P (type);
4427 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4429 /* If an explicit initializer is present, or if this is a definition
4430 of an aggregate, then we need a complete type at this point.
4431 (Scalars are always complete types, so there is nothing to
4432 check.) This code just sets COMPLETE_P; errors (if necessary)
4433 are issued below. */
4434 if ((initialized || aggregate_definition_p)
4436 && COMPLETE_TYPE_P (complete_type (type)))
4439 /* We will not yet have set TREE_READONLY on DECL if the type
4440 was "const", but incomplete, before this point. But, now, we
4441 have a complete type, so we can try again. */
4442 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4446 /* Is it valid for this decl to have an initializer at all? */
4448 /* Don't allow initializations for incomplete types except for
4449 arrays which might be completed by the initialization. */
4451 ; /* A complete type is ok. */
4452 else if (type_uses_auto (type))
4453 ; /* An auto type is ok. */
4454 else if (TREE_CODE (type) != ARRAY_TYPE)
4456 error ("variable %q#D has initializer but incomplete type", decl);
4457 type = TREE_TYPE (decl) = error_mark_node;
4459 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4461 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4462 error ("elements of array %q#D have incomplete type", decl);
4463 /* else we already gave an error in start_decl. */
4466 else if (aggregate_definition_p && !complete_p)
4468 if (type_uses_auto (type))
4469 error ("declaration of %q#D has no initializer", decl);
4471 error ("aggregate %q#D has incomplete type and cannot be defined",
4473 /* Change the type so that assemble_variable will give
4474 DECL an rtl we can live with: (mem (const_int 0)). */
4475 type = TREE_TYPE (decl) = error_mark_node;
4478 /* Create a new scope to hold this declaration if necessary.
4479 Whether or not a new scope is necessary cannot be determined
4480 until after the type has been completed; if the type is a
4481 specialization of a class template it is not until after
4482 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4483 will be set correctly. */
4484 maybe_push_cleanup_level (type);
4487 /* Handle initialization of references. DECL, TYPE, and INIT have the
4488 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4489 but will be set to a new CLEANUP_STMT if a temporary is created
4490 that must be destroyed subsequently.
4492 Returns an initializer expression to use to initialize DECL, or
4493 NULL if the initialization can be performed statically.
4495 Quotes on semantics can be found in ARM 8.4.3. */
4498 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4502 if (init == NULL_TREE)
4504 if ((DECL_LANG_SPECIFIC (decl) == 0
4505 || DECL_IN_AGGR_P (decl) == 0)
4506 && ! DECL_THIS_EXTERN (decl))
4507 error ("%qD declared as reference but not initialized", decl);
4511 if (TREE_CODE (init) == TREE_LIST)
4512 init = build_x_compound_expr_from_list (init, ELK_INIT,
4513 tf_warning_or_error);
4515 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4516 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4517 /* Note: default conversion is only called in very special cases. */
4518 init = decay_conversion (init);
4520 /* Convert INIT to the reference type TYPE. This may involve the
4521 creation of a temporary, whose lifetime must be the same as that
4522 of the reference. If so, a DECL_EXPR for the temporary will be
4523 added just after the DECL_EXPR for DECL. That's why we don't set
4524 DECL_INITIAL for local references (instead assigning to them
4525 explicitly); we need to allow the temporary to be initialized
4527 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4529 if (tmp == error_mark_node)
4531 else if (tmp == NULL_TREE)
4533 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4537 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4540 DECL_INITIAL (decl) = tmp;
4545 /* Subroutine of check_initializer. We're initializing a DECL of
4546 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4547 extend the lifetime of the underlying array to match that of the decl,
4548 just like for reference initialization. CLEANUP is as for
4549 grok_reference_init. */
4552 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4555 tree aggr_init, array, arrtype;
4556 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4557 if (error_operand_p (init))
4558 return error_mark_node;
4560 aggr_init = TARGET_EXPR_INITIAL (init);
4561 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4562 arrtype = TREE_TYPE (array);
4564 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4565 array = TREE_OPERAND (array, 0);
4566 /* If the array is constant, finish_compound_literal already made it a
4567 static variable and we don't need to do anything here. */
4568 if (decl && TREE_CODE (array) == TARGET_EXPR)
4570 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4571 var = build_address (var);
4572 var = convert (arrtype, var);
4573 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4578 /* Designated initializers in arrays are not supported in GNU C++.
4579 The parser cannot detect this error since it does not know whether
4580 a given brace-enclosed initializer is for a class type or for an
4581 array. This function checks that CE does not use a designated
4582 initializer. If it does, an error is issued. Returns true if CE
4583 is valid, i.e., does not have a designated initializer. */
4586 check_array_designated_initializer (const constructor_elt *ce)
4588 /* Designated initializers for array elements are not supported. */
4591 /* The parser only allows identifiers as designated
4593 if (ce->index == error_mark_node)
4594 error ("name used in a GNU-style designated "
4595 "initializer for an array");
4598 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4599 error ("name %qD used in a GNU-style designated "
4600 "initializer for an array", ce->index);
4608 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4609 array until we finish parsing the initializer. If that's the
4610 situation we're in, update DECL accordingly. */
4613 maybe_deduce_size_from_array_init (tree decl, tree init)
4615 tree type = TREE_TYPE (decl);
4617 if (TREE_CODE (type) == ARRAY_TYPE
4618 && TYPE_DOMAIN (type) == NULL_TREE
4619 && TREE_CODE (decl) != TYPE_DECL)
4621 /* do_default is really a C-ism to deal with tentative definitions.
4622 But let's leave it here to ease the eventual merge. */
4623 int do_default = !DECL_EXTERNAL (decl);
4624 tree initializer = init ? init : DECL_INITIAL (decl);
4627 /* Check that there are no designated initializers in INIT, as
4628 those are not supported in GNU C++, and as the middle-end
4629 will crash if presented with a non-numeric designated
4631 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4633 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4634 constructor_elt *ce;
4636 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4637 if (!check_array_designated_initializer (ce))
4643 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4647 error ("initializer fails to determine size of %qD", decl);
4648 TREE_TYPE (decl) = error_mark_node;
4650 else if (failure == 2)
4654 error ("array size missing in %qD", decl);
4655 TREE_TYPE (decl) = error_mark_node;
4657 /* If a `static' var's size isn't known, make it extern as
4658 well as static, so it does not get allocated. If it's not
4659 `static', then don't mark it extern; finish_incomplete_decl
4660 will give it a default size and it will get allocated. */
4661 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4662 DECL_EXTERNAL (decl) = 1;
4664 else if (failure == 3)
4666 error ("zero-size array %qD", decl);
4667 TREE_TYPE (decl) = error_mark_node;
4671 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4673 relayout_decl (decl);
4677 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4678 any appropriate error messages regarding the layout. */
4681 layout_var_decl (tree decl)
4685 type = TREE_TYPE (decl);
4686 if (type == error_mark_node)
4689 /* If we haven't already layed out this declaration, do so now.
4690 Note that we must not call complete type for an external object
4691 because it's type might involve templates that we are not
4692 supposed to instantiate yet. (And it's perfectly valid to say
4693 `extern X x' for some incomplete type `X'.) */
4694 if (!DECL_EXTERNAL (decl))
4695 complete_type (type);
4696 if (!DECL_SIZE (decl)
4697 && TREE_TYPE (decl) != error_mark_node
4698 && (COMPLETE_TYPE_P (type)
4699 || (TREE_CODE (type) == ARRAY_TYPE
4700 && !TYPE_DOMAIN (type)
4701 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4702 layout_decl (decl, 0);
4704 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4706 /* An automatic variable with an incomplete type: that is an error.
4707 Don't talk about array types here, since we took care of that
4708 message in grokdeclarator. */
4709 error ("storage size of %qD isn%'t known", decl);
4710 TREE_TYPE (decl) = error_mark_node;
4713 /* Keep this code around in case we later want to control debug info
4714 based on whether a type is "used". (jason 1999-11-11) */
4716 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4717 /* Let debugger know it should output info for this type. */
4718 note_debug_info_needed (ttype);
4720 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4721 note_debug_info_needed (DECL_CONTEXT (decl));
4724 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4725 && DECL_SIZE (decl) != NULL_TREE
4726 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4728 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4729 constant_expression_warning (DECL_SIZE (decl));
4732 error ("storage size of %qD isn%'t constant", decl);
4733 TREE_TYPE (decl) = error_mark_node;
4738 /* If a local static variable is declared in an inline function, or if
4739 we have a weak definition, we must endeavor to create only one
4740 instance of the variable at link-time. */
4743 maybe_commonize_var (tree decl)
4745 /* Static data in a function with comdat linkage also has comdat
4747 if (TREE_STATIC (decl)
4748 /* Don't mess with __FUNCTION__. */
4749 && ! DECL_ARTIFICIAL (decl)
4750 && DECL_FUNCTION_SCOPE_P (decl)
4751 && vague_linkage_p (DECL_CONTEXT (decl)))
4755 /* With weak symbols, we simply make the variable COMDAT;
4756 that will cause copies in multiple translations units to
4758 comdat_linkage (decl);
4762 if (DECL_INITIAL (decl) == NULL_TREE
4763 || DECL_INITIAL (decl) == error_mark_node)
4765 /* Without weak symbols, we can use COMMON to merge
4766 uninitialized variables. */
4767 TREE_PUBLIC (decl) = 1;
4768 DECL_COMMON (decl) = 1;
4772 /* While for initialized variables, we must use internal
4773 linkage -- which means that multiple copies will not
4775 TREE_PUBLIC (decl) = 0;
4776 DECL_COMMON (decl) = 0;
4777 warning_at (input_location, 0,
4778 "sorry: semantics of inline function static "
4779 "data %q+#D are wrong (you%'ll wind up "
4780 "with multiple copies)", decl);
4781 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4782 " you can work around this by removing "
4787 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4788 /* Set it up again; we might have set DECL_INITIAL since the last
4790 comdat_linkage (decl);
4793 /* Issue an error message if DECL is an uninitialized const variable. */
4796 check_for_uninitialized_const_var (tree decl)
4798 tree type = strip_array_types (TREE_TYPE (decl));
4800 /* ``Unless explicitly declared extern, a const object does not have
4801 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4803 if (TREE_CODE (decl) == VAR_DECL
4804 && TREE_CODE (type) != REFERENCE_TYPE
4805 && CP_TYPE_CONST_P (type)
4806 && (!TYPE_NEEDS_CONSTRUCTING (type)
4807 || !type_has_user_provided_default_constructor (type))
4808 && !DECL_INITIAL (decl))
4810 permerror (DECL_SOURCE_LOCATION (decl),
4811 "uninitialized const %qD", decl);
4813 if (CLASS_TYPE_P (type)
4814 && !type_has_user_provided_default_constructor (type))
4816 tree defaulted_ctor;
4818 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4819 "%q#T has no user-provided default constructor", type);
4820 defaulted_ctor = in_class_defaulted_default_constructor (type);
4822 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4823 "constructor is not user-provided because it is "
4824 "explicitly defaulted in the class body");
4829 /* Structure holding the current initializer being processed by reshape_init.
4830 CUR is a pointer to the current element being processed, END is a pointer
4831 after the last element present in the initializer. */
4832 typedef struct reshape_iterator_t
4834 constructor_elt *cur;
4835 constructor_elt *end;
4838 static tree reshape_init_r (tree, reshape_iter *, bool);
4840 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4841 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4842 initialized. If there are no more such fields, the return value
4846 next_initializable_field (tree field)
4849 && (TREE_CODE (field) != FIELD_DECL
4850 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4851 || DECL_ARTIFICIAL (field)))
4852 field = DECL_CHAIN (field);
4857 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4858 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4859 INTEGER_CST representing the size of the array minus one (the maximum index),
4860 or NULL_TREE if the array was declared without specifying the size. D is
4861 the iterator within the constructor. */
4864 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4867 bool sized_array_p = (max_index != NULL_TREE);
4868 unsigned HOST_WIDE_INT max_index_cst = 0;
4869 unsigned HOST_WIDE_INT index;
4871 /* The initializer for an array is always a CONSTRUCTOR. */
4872 new_init = build_constructor (init_list_type_node, NULL);
4876 /* Minus 1 is used for zero sized arrays. */
4877 if (integer_all_onesp (max_index))
4880 if (host_integerp (max_index, 1))
4881 max_index_cst = tree_low_cst (max_index, 1);
4882 /* sizetype is sign extended, not zero extended. */
4884 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4888 /* Loop until there are no more initializers. */
4890 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4895 check_array_designated_initializer (d->cur);
4896 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4897 if (elt_init == error_mark_node)
4898 return error_mark_node;
4899 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4905 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4906 Parameters are the same of reshape_init_r. */
4909 reshape_init_array (tree type, reshape_iter *d)
4911 tree max_index = NULL_TREE;
4913 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4915 if (TYPE_DOMAIN (type))
4916 max_index = array_type_nelts (type);
4918 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4921 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4922 Parameters are the same of reshape_init_r. */
4925 reshape_init_vector (tree type, reshape_iter *d)
4927 tree max_index = NULL_TREE;
4929 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4931 if (COMPOUND_LITERAL_P (d->cur->value))
4933 tree value = d->cur->value;
4934 if (!same_type_p (TREE_TYPE (value), type))
4936 error ("invalid type %qT as initializer for a vector of type %qT",
4937 TREE_TYPE (d->cur->value), type);
4938 value = error_mark_node;
4944 /* For a vector, we initialize it as an array of the appropriate size. */
4945 if (TREE_CODE (type) == VECTOR_TYPE)
4946 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4948 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4951 /* Subroutine of reshape_init_r, processes the initializers for classes
4952 or union. Parameters are the same of reshape_init_r. */
4955 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4960 gcc_assert (CLASS_TYPE_P (type));
4962 /* The initializer for a class is always a CONSTRUCTOR. */
4963 new_init = build_constructor (init_list_type_node, NULL);
4964 field = next_initializable_field (TYPE_FIELDS (type));
4970 An initializer for an aggregate member that is an
4971 empty class shall have the form of an empty
4972 initializer-list {}. */
4973 if (!first_initializer_p)
4975 error ("initializer for %qT must be brace-enclosed", type);
4976 return error_mark_node;
4981 /* Loop through the initializable fields, gathering initializers. */
4982 while (d->cur != d->end)
4986 /* Handle designated initializers, as an extension. */
4989 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4991 if (!field || TREE_CODE (field) != FIELD_DECL)
4993 error ("%qT has no non-static data member named %qD", type,
4995 return error_mark_node;
4999 /* If we processed all the member of the class, we are done. */
5003 field_init = reshape_init_r (TREE_TYPE (field), d,
5004 /*first_initializer_p=*/false);
5005 if (field_init == error_mark_node)
5006 return error_mark_node;
5008 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5012 When a union is initialized with a brace-enclosed
5013 initializer, the braces shall only contain an
5014 initializer for the first member of the union. */
5015 if (TREE_CODE (type) == UNION_TYPE)
5018 field = next_initializable_field (DECL_CHAIN (field));
5024 /* Subroutine of reshape_init, which processes a single initializer (part of
5025 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5026 iterator within the CONSTRUCTOR which points to the initializer to process.
5027 FIRST_INITIALIZER_P is true if this is the first initializer of the
5028 outermost CONSTRUCTOR node. */
5031 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5033 tree init = d->cur->value;
5035 if (error_operand_p (init))
5036 return error_mark_node;
5038 /* A non-aggregate type is always initialized with a single
5040 if (!CP_AGGREGATE_TYPE_P (type))
5042 /* It is invalid to initialize a non-aggregate type with a
5043 brace-enclosed initializer before C++0x.
5044 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5045 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5046 a CONSTRUCTOR (with a record type). */
5047 if (TREE_CODE (init) == CONSTRUCTOR
5048 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5050 if (SCALAR_TYPE_P (type))
5052 error ("braces around scalar initializer for type %qT", type);
5053 init = error_mark_node;
5056 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5065 All implicit type conversions (clause _conv_) are considered when
5066 initializing the aggregate member with an initializer from an
5067 initializer-list. If the initializer can initialize a member,
5068 the member is initialized. Otherwise, if the member is itself a
5069 non-empty subaggregate, brace elision is assumed and the
5070 initializer is considered for the initialization of the first
5071 member of the subaggregate. */
5072 if (TREE_CODE (init) != CONSTRUCTOR
5073 /* But don't try this for the first initializer, since that would be
5074 looking through the outermost braces; A a2 = { a1 }; is not a
5075 valid aggregate initialization. */
5076 && !first_initializer_p
5077 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5078 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5084 /* [dcl.init.string]
5086 A char array (whether plain char, signed char, or unsigned char)
5087 can be initialized by a string-literal (optionally enclosed in
5088 braces); a wchar_t array can be initialized by a wide
5089 string-literal (optionally enclosed in braces). */
5090 if (TREE_CODE (type) == ARRAY_TYPE
5091 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5093 tree str_init = init;
5095 /* Strip one level of braces if and only if they enclose a single
5096 element (as allowed by [dcl.init.string]). */
5097 if (!first_initializer_p
5098 && TREE_CODE (str_init) == CONSTRUCTOR
5099 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5101 str_init = VEC_index (constructor_elt,
5102 CONSTRUCTOR_ELTS (str_init), 0)->value;
5105 /* If it's a string literal, then it's the initializer for the array
5106 as a whole. Otherwise, continue with normal initialization for
5107 array types (one value per array element). */
5108 if (TREE_CODE (str_init) == STRING_CST)
5115 /* The following cases are about aggregates. If we are not within a full
5116 initializer already, and there is not a CONSTRUCTOR, it means that there
5117 is a missing set of braces (that is, we are processing the case for
5118 which reshape_init exists). */
5119 if (!first_initializer_p)
5121 if (TREE_CODE (init) == CONSTRUCTOR)
5123 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5124 /* There is no need to reshape pointer-to-member function
5125 initializers, as they are always constructed correctly
5126 by the front end. */
5128 else if (COMPOUND_LITERAL_P (init))
5129 /* For a nested compound literal, there is no need to reshape since
5130 brace elision is not allowed. Even if we decided to allow it,
5131 we should add a call to reshape_init in finish_compound_literal,
5132 before calling digest_init, so changing this code would still
5133 not be necessary. */
5134 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5138 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5139 return reshape_init (type, init);
5143 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5147 /* Dispatch to specialized routines. */
5148 if (CLASS_TYPE_P (type))
5149 return reshape_init_class (type, d, first_initializer_p);
5150 else if (TREE_CODE (type) == ARRAY_TYPE)
5151 return reshape_init_array (type, d);
5152 else if (TREE_CODE (type) == VECTOR_TYPE)
5153 return reshape_init_vector (type, d);
5158 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5159 brace-enclosed aggregate initializer.
5161 INIT is the CONSTRUCTOR containing the list of initializers describing
5162 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5163 It may not presently match the shape of the TYPE; for example:
5165 struct S { int a; int b; };
5166 struct S a[] = { 1, 2, 3, 4 };
5168 Here INIT will hold a VEC of four elements, rather than a
5169 VEC of two elements, each itself a VEC of two elements. This
5170 routine transforms INIT from the former form into the latter. The
5171 revised CONSTRUCTOR node is returned. */
5174 reshape_init (tree type, tree init)
5176 VEC(constructor_elt, gc) *v;
5180 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5182 v = CONSTRUCTOR_ELTS (init);
5184 /* An empty constructor does not need reshaping, and it is always a valid
5186 if (VEC_empty (constructor_elt, v))
5189 /* Recurse on this CONSTRUCTOR. */
5190 d.cur = VEC_index (constructor_elt, v, 0);
5191 d.end = d.cur + VEC_length (constructor_elt, v);
5193 new_init = reshape_init_r (type, &d, true);
5194 if (new_init == error_mark_node)
5195 return error_mark_node;
5197 /* Make sure all the element of the constructor were used. Otherwise,
5198 issue an error about exceeding initializers. */
5200 error ("too many initializers for %qT", type);
5205 /* Verify array initializer. Returns true if errors have been reported. */
5208 check_array_initializer (tree decl, tree type, tree init)
5210 tree element_type = TREE_TYPE (type);
5212 /* The array type itself need not be complete, because the
5213 initializer may tell us how many elements are in the array.
5214 But, the elements of the array must be complete. */
5215 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5218 error ("elements of array %q#D have incomplete type", decl);
5220 error ("elements of array %q#T have incomplete type", type);
5223 /* It is not valid to initialize a VLA. */
5225 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5226 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5229 error ("variable-sized object %qD may not be initialized", decl);
5231 error ("variable-sized compound literal");
5237 /* Subroutine of check_initializer; args are passed down from that function.
5238 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5241 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5244 int saved_stmts_are_full_exprs_p = 0;
5245 if (building_stmt_tree ())
5247 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5248 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5250 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5251 if (building_stmt_tree ())
5252 current_stmt_tree ()->stmts_are_full_exprs_p =
5253 saved_stmts_are_full_exprs_p;
5257 /* Verify INIT (the initializer for DECL), and record the
5258 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5259 grok_reference_init.
5261 If the return value is non-NULL, it is an expression that must be
5262 evaluated dynamically to initialize DECL. */
5265 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5267 tree type = TREE_TYPE (decl);
5268 tree init_code = NULL;
5269 tree extra_init = NULL_TREE;
5272 /* Things that are going to be initialized need to have complete
5274 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5276 if (type == error_mark_node)
5277 /* We will have already complained. */
5280 if (TREE_CODE (type) == ARRAY_TYPE)
5282 if (check_array_initializer (decl, type, init))
5285 else if (!COMPLETE_TYPE_P (type))
5287 error ("%qD has incomplete type", decl);
5288 TREE_TYPE (decl) = error_mark_node;
5292 /* There is no way to make a variable-sized class type in GNU C++. */
5293 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5295 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5297 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5298 if (SCALAR_TYPE_P (type))
5302 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5303 init = build_zero_init (type, NULL_TREE, false);
5305 else if (init_len != 1)
5307 error ("scalar object %qD requires one element in initializer",
5309 TREE_TYPE (decl) = error_mark_node;
5315 if (TREE_CODE (decl) == CONST_DECL)
5317 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5319 DECL_INITIAL (decl) = init;
5321 gcc_assert (init != NULL_TREE);
5324 else if (!init && DECL_REALLY_EXTERN (decl))
5326 else if (TREE_CODE (type) == REFERENCE_TYPE)
5327 init = grok_reference_init (decl, type, init, cleanup);
5328 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5331 check_for_uninitialized_const_var (decl);
5332 /* Do not reshape constructors of vectors (they don't need to be
5334 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5336 if (is_std_init_list (type))
5337 init = build_init_list_var_init (decl, type, init,
5338 &extra_init, cleanup);
5339 else if (TYPE_NON_AGGREGATE_CLASS (type))
5341 /* Don't reshape if the class has constructors. */
5342 if (cxx_dialect == cxx98)
5343 error ("in C++98 %qD must be initialized by constructor, "
5347 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5349 error ("opaque vector types cannot be initialized");
5350 init = error_mark_node;
5353 init = reshape_init (type, init);
5356 /* If DECL has an array type without a specific bound, deduce the
5357 array size from the initializer. */
5358 maybe_deduce_size_from_array_init (decl, init);
5359 type = TREE_TYPE (decl);
5360 if (type == error_mark_node)
5363 if (TYPE_NEEDS_CONSTRUCTING (type)
5364 || (CLASS_TYPE_P (type)
5365 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5367 init_code = build_aggr_init_full_exprs (decl, init, flags);
5369 /* If this is a constexpr initializer, expand_default_init will
5370 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5371 case, pull the initializer back out and pass it down into
5372 store_init_value. */
5373 while (TREE_CODE (init_code) == EXPR_STMT
5374 || TREE_CODE (init_code) == CONVERT_EXPR)
5375 init_code = TREE_OPERAND (init_code, 0);
5376 if (TREE_CODE (init_code) == INIT_EXPR)
5378 init = TREE_OPERAND (init_code, 1);
5379 init_code = NULL_TREE;
5380 /* Don't call digest_init; it's unnecessary and will complain
5381 about aggregate initialization of non-aggregate classes. */
5382 flags |= LOOKUP_ALREADY_DIGESTED;
5384 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5386 /* Declared constexpr, but no suitable initializer; massage
5387 init appropriately so we can pass it into store_init_value
5389 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5390 init = finish_compound_literal (type, init);
5391 else if (CLASS_TYPE_P (type)
5392 && (!init || TREE_CODE (init) == TREE_LIST))
5394 init = build_functional_cast (type, init, tf_none);
5395 if (init != error_mark_node)
5396 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5398 init_code = NULL_TREE;
5404 if (init && TREE_CODE (init) != TREE_VEC)
5406 init_code = store_init_value (decl, init, flags);
5407 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5408 && DECL_INITIAL (decl)
5409 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5410 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5411 warning (0, "array %qD initialized by parenthesized string literal %qE",
5412 decl, DECL_INITIAL (decl));
5418 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5419 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5420 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5421 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5424 check_for_uninitialized_const_var (decl);
5427 if (init && init != error_mark_node)
5428 init_code = build2 (INIT_EXPR, type, decl, init);
5431 init_code = add_stmt_to_compound (extra_init, init_code);
5433 if (init_code && DECL_IN_AGGR_P (decl))
5435 static int explained = 0;
5437 if (cxx_dialect < cxx0x)
5438 error ("initializer invalid for static member with constructor");
5440 error ("non-constant in-class initialization invalid for static "
5441 "member %qD", decl);
5444 error ("(an out of class initialization is required)");
5452 /* If DECL is not a local variable, give it RTL. */
5455 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5457 int toplev = toplevel_bindings_p ();
5459 const char *filename;
5461 /* Set the DECL_ASSEMBLER_NAME for the object. */
5464 /* The `register' keyword, when used together with an
5465 asm-specification, indicates that the variable should be
5466 placed in a particular register. */
5467 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5469 set_user_assembler_name (decl, asmspec);
5470 DECL_HARD_REGISTER (decl) = 1;
5474 if (TREE_CODE (decl) == FUNCTION_DECL
5475 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5476 set_builtin_user_assembler_name (decl, asmspec);
5477 set_user_assembler_name (decl, asmspec);
5481 /* Handle non-variables up front. */
5482 if (TREE_CODE (decl) != VAR_DECL)
5484 rest_of_decl_compilation (decl, toplev, at_eof);
5488 /* If we see a class member here, it should be a static data
5490 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5492 gcc_assert (TREE_STATIC (decl));
5493 /* An in-class declaration of a static data member should be
5494 external; it is only a declaration, and not a definition. */
5495 if (init == NULL_TREE)
5496 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5499 /* We don't create any RTL for local variables. */
5500 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5503 /* We defer emission of local statics until the corresponding
5504 DECL_EXPR is expanded. */
5505 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5507 /* We try to defer namespace-scope static constants so that they are
5508 not emitted into the object file unnecessarily. */
5509 filename = input_filename;
5510 if (!DECL_VIRTUAL_P (decl)
5511 && TREE_READONLY (decl)
5512 && DECL_INITIAL (decl) != NULL_TREE
5513 && DECL_INITIAL (decl) != error_mark_node
5515 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5517 && !TREE_PUBLIC (decl))
5519 /* Fool with the linkage of static consts according to #pragma
5521 struct c_fileinfo *finfo = get_fileinfo (filename);
5522 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5524 TREE_PUBLIC (decl) = 1;
5525 DECL_EXTERNAL (decl) = finfo->interface_only;
5530 /* Likewise for template instantiations. */
5531 else if (DECL_LANG_SPECIFIC (decl)
5532 && DECL_IMPLICIT_INSTANTIATION (decl))
5535 /* If we're not deferring, go ahead and assemble the variable. */
5537 rest_of_decl_compilation (decl, toplev, at_eof);
5540 /* walk_tree helper for wrap_temporary_cleanups, below. */
5543 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5545 if (TYPE_P (*stmt_p))
5551 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5553 tree guard = (tree)data;
5554 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5556 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5557 /* Tell honor_protect_cleanup_actions to handle this as a separate
5559 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5561 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5567 /* We're initializing a local variable which has a cleanup GUARD. If there
5568 are any temporaries used in the initializer INIT of this variable, we
5569 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5570 variable will be cleaned up properly if one of them throws.
5572 Unfortunately, there's no way to express this properly in terms of
5573 nesting, as the regions for the temporaries overlap the region for the
5574 variable itself; if there are two temporaries, the variable needs to be
5575 the first thing destroyed if either of them throws. However, we only
5576 want to run the variable's cleanup if it actually got constructed. So
5577 we need to guard the temporary cleanups with the variable's cleanup if
5578 they are run on the normal path, but not if they are run on the
5579 exceptional path. We implement this by telling
5580 honor_protect_cleanup_actions to strip the variable cleanup from the
5581 exceptional path. */
5584 wrap_temporary_cleanups (tree init, tree guard)
5586 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5589 /* Generate code to initialize DECL (a local variable). */
5592 initialize_local_var (tree decl, tree init)
5594 tree type = TREE_TYPE (decl);
5598 gcc_assert (TREE_CODE (decl) == VAR_DECL
5599 || TREE_CODE (decl) == RESULT_DECL);
5600 gcc_assert (!TREE_STATIC (decl));
5602 if (DECL_SIZE (decl) == NULL_TREE)
5604 /* If we used it already as memory, it must stay in memory. */
5605 DECL_INITIAL (decl) = NULL_TREE;
5606 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5610 if (type == error_mark_node)
5613 /* Compute and store the initial value. */
5614 already_used = TREE_USED (decl) || TREE_USED (type);
5615 if (TREE_USED (type))
5616 DECL_READ_P (decl) = 1;
5618 /* Generate a cleanup, if necessary. */
5619 cleanup = cxx_maybe_build_cleanup (decl);
5621 /* Perform the initialization. */
5624 int saved_stmts_are_full_exprs_p;
5626 /* If we're only initializing a single object, guard the destructors
5627 of any temporaries used in its initializer with its destructor.
5628 This isn't right for arrays because each element initialization is
5629 a full-expression. */
5630 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5631 wrap_temporary_cleanups (init, cleanup);
5633 gcc_assert (building_stmt_tree ());
5634 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5635 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5636 finish_expr_stmt (init);
5637 current_stmt_tree ()->stmts_are_full_exprs_p =
5638 saved_stmts_are_full_exprs_p;
5641 /* Set this to 0 so we can tell whether an aggregate which was
5642 initialized was ever used. Don't do this if it has a
5643 destructor, so we don't complain about the 'resource
5644 allocation is initialization' idiom. Now set
5645 attribute((unused)) on types so decls of that type will be
5646 marked used. (see TREE_USED, above.) */
5647 if (TYPE_NEEDS_CONSTRUCTING (type)
5649 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5650 && DECL_NAME (decl))
5651 TREE_USED (decl) = 0;
5652 else if (already_used)
5653 TREE_USED (decl) = 1;
5656 finish_decl_cleanup (decl, cleanup);
5659 /* DECL is a VAR_DECL for a compiler-generated variable with static
5660 storage duration (like a virtual table) whose initializer is a
5661 compile-time constant. Initialize the variable and provide it to the
5665 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5668 gcc_assert (DECL_ARTIFICIAL (decl));
5669 init = build_constructor (TREE_TYPE (decl), v);
5670 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5671 DECL_INITIAL (decl) = init;
5672 DECL_INITIALIZED_P (decl) = 1;
5673 determine_visibility (decl);
5674 layout_var_decl (decl);
5675 maybe_commonize_var (decl);
5676 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5679 /* INIT is the initializer for a variable, as represented by the
5680 parser. Returns true iff INIT is value-dependent. */
5683 value_dependent_init_p (tree init)
5685 if (TREE_CODE (init) == TREE_LIST)
5686 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5687 return any_value_dependent_elements_p (init);
5688 else if (TREE_CODE (init) == CONSTRUCTOR)
5689 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5691 VEC(constructor_elt, gc) *elts;
5695 elts = CONSTRUCTOR_ELTS (init);
5696 nelts = VEC_length (constructor_elt, elts);
5697 for (i = 0; i < nelts; ++i)
5698 if (value_dependent_init_p (VEC_index (constructor_elt,
5703 /* It must be a simple expression, e.g., int i = 3; */
5704 return value_dependent_expression_p (init);
5709 /* Finish processing of a declaration;
5710 install its line number and initial value.
5711 If the length of an array type is not known before,
5712 it must be determined now, from the initial value, or it is an error.
5714 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5715 true, then INIT is an integral constant expression.
5717 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5718 if the (init) syntax was used. */
5721 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5722 tree asmspec_tree, int flags)
5726 const char *asmspec = NULL;
5727 int was_readonly = 0;
5728 bool var_definition_p = false;
5729 int saved_processing_template_decl;
5732 if (decl == error_mark_node)
5737 error ("assignment (not initialization) in declaration");
5741 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5742 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5743 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5745 type = TREE_TYPE (decl);
5746 if (type == error_mark_node)
5749 /* Assume no cleanup is required. */
5750 cleanup = NULL_TREE;
5751 saved_processing_template_decl = processing_template_decl;
5753 /* If a name was specified, get the string. */
5754 if (global_scope_p (current_binding_level))
5755 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5756 if (asmspec_tree && asmspec_tree != error_mark_node)
5757 asmspec = TREE_STRING_POINTER (asmspec_tree);
5759 if (current_class_type
5760 && CP_DECL_CONTEXT (decl) == current_class_type
5761 && TYPE_BEING_DEFINED (current_class_type)
5762 && (DECL_INITIAL (decl) || init))
5763 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5765 auto_node = type_uses_auto (type);
5769 if (init == NULL_TREE)
5771 error ("declaration of %q#D has no initializer", decl);
5772 TREE_TYPE (decl) = error_mark_node;
5776 if (TREE_CODE (d_init) == TREE_LIST)
5777 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5778 tf_warning_or_error);
5779 d_init = resolve_nondeduced_context (d_init);
5780 if (describable_type (d_init))
5782 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5784 if (type == error_mark_node)
5789 if (TREE_CODE (decl) == FUNCTION_DECL)
5790 validate_constexpr_fundecl (decl);
5792 else if (!ensure_literal_type_for_constexpr_object (decl))
5793 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5795 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5798 if (init == ridpointers[(int)RID_DELETE])
5800 /* FIXME check this is 1st decl. */
5801 DECL_DELETED_FN (decl) = 1;
5802 DECL_DECLARED_INLINE_P (decl) = 1;
5803 DECL_INITIAL (decl) = error_mark_node;
5804 FOR_EACH_CLONE (clone, decl)
5806 DECL_DELETED_FN (clone) = 1;
5807 DECL_DECLARED_INLINE_P (clone) = 1;
5808 DECL_INITIAL (clone) = error_mark_node;
5812 else if (init == ridpointers[(int)RID_DEFAULT])
5814 if (defaultable_fn_check (decl))
5815 DECL_DEFAULTED_FN (decl) = 1;
5817 DECL_INITIAL (decl) = NULL_TREE;
5821 if (init && TREE_CODE (decl) == VAR_DECL)
5823 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5824 /* FIXME we rely on TREE_CONSTANT below; basing that on
5825 init_const_expr_p is probably wrong for C++0x. */
5826 if (init_const_expr_p)
5828 /* Set these flags now for C++98 templates. We'll update the
5829 flags in store_init_value for instantiations and C++0x. */
5830 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5831 if (decl_maybe_constant_var_p (decl))
5832 TREE_CONSTANT (decl) = 1;
5836 if (processing_template_decl)
5838 bool type_dependent_p;
5840 /* Add this declaration to the statement-tree. */
5841 if (at_function_scope_p ())
5842 add_decl_expr (decl);
5844 type_dependent_p = dependent_type_p (type);
5846 if (check_for_bare_parameter_packs (init))
5849 DECL_INITIAL (decl) = NULL_TREE;
5852 /* Generally, initializers in templates are expanded when the
5853 template is instantiated. But, if DECL is a variable constant
5854 then it can be used in future constant expressions, so its value
5855 must be available. */
5857 && DECL_CLASS_SCOPE_P (decl)
5858 /* We just set TREE_CONSTANT appropriately; see above. */
5859 && TREE_CONSTANT (decl)
5860 && !type_dependent_p
5861 /* FIXME non-value-dependent constant expression */
5862 && !value_dependent_init_p (init)))
5865 DECL_INITIAL (decl) = init;
5866 if (TREE_CODE (decl) == VAR_DECL
5867 && !DECL_PRETTY_FUNCTION_P (decl)
5868 && !type_dependent_p)
5869 maybe_deduce_size_from_array_init (decl, init);
5873 if (TREE_CODE (init) == TREE_LIST)
5875 /* If the parenthesized-initializer form was used (e.g.,
5876 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5877 arguments. (There is generally only one.) We convert them
5880 for (; list; list = TREE_CHAIN (list))
5882 tree elt = TREE_VALUE (list);
5883 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5887 init = fold_non_dependent_expr (init);
5888 processing_template_decl = 0;
5891 /* Take care of TYPE_DECLs up front. */
5892 if (TREE_CODE (decl) == TYPE_DECL)
5894 if (type != error_mark_node
5895 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5897 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5898 warning (0, "shadowing previous type declaration of %q#D", decl);
5899 set_identifier_type_value (DECL_NAME (decl), decl);
5902 /* If we have installed this as the canonical typedef for this
5903 type, and that type has not been defined yet, delay emitting
5904 the debug information for it, as we will emit it later. */
5905 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5906 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5907 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5909 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5914 /* A reference will be modified here, as it is initialized. */
5915 if (! DECL_EXTERNAL (decl)
5916 && TREE_READONLY (decl)
5917 && TREE_CODE (type) == REFERENCE_TYPE)
5920 TREE_READONLY (decl) = 0;
5923 if (TREE_CODE (decl) == VAR_DECL)
5925 /* Only variables with trivial initialization and destruction can
5926 have thread-local storage. */
5927 if (DECL_THREAD_LOCAL_P (decl)
5928 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5929 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5930 error ("%qD cannot be thread-local because it has non-trivial "
5931 "type %qT", decl, TREE_TYPE (decl));
5932 /* If this is a local variable that will need a mangled name,
5933 register it now. We must do this before processing the
5934 initializer for the variable, since the initialization might
5935 require a guard variable, and since the mangled name of the
5936 guard variable will depend on the mangled name of this
5938 if (DECL_FUNCTION_SCOPE_P (decl)
5939 && TREE_STATIC (decl)
5940 && !DECL_ARTIFICIAL (decl))
5942 push_local_name (decl);
5943 if (DECL_CONSTRUCTOR_P (current_function_decl)
5944 || DECL_DESTRUCTOR_P (current_function_decl))
5945 /* Normally local_decls is populated during GIMPLE lowering,
5946 but [cd]tors are never actually compiled directly. We need
5947 to put statics on the list so we can deal with the label
5948 address extension. */
5949 add_local_decl (cfun, decl);
5952 /* Convert the initializer to the type of DECL, if we have not
5953 already initialized DECL. */
5954 if (!DECL_INITIALIZED_P (decl)
5955 /* If !DECL_EXTERNAL then DECL is being defined. In the
5956 case of a static data member initialized inside the
5957 class-specifier, there can be an initializer even if DECL
5958 is *not* defined. */
5959 && (!DECL_EXTERNAL (decl) || init))
5961 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5964 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5965 /* Allow libjava/prims.cc define primitive classes. */
5966 if (init != NULL_TREE
5967 || jclass == NULL_TREE
5968 || TREE_CODE (jclass) != TYPE_DECL
5969 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5970 || !same_type_ignoring_top_level_qualifiers_p
5971 (type, TREE_TYPE (TREE_TYPE (jclass))))
5972 error ("Java object %qD not allocated with %<new%>", decl);
5975 init = check_initializer (decl, init, flags, &cleanup);
5976 /* Thread-local storage cannot be dynamically initialized. */
5977 if (DECL_THREAD_LOCAL_P (decl) && init)
5979 error ("%qD is thread-local and so cannot be dynamically "
5980 "initialized", decl);
5984 /* Check that the initializer for a static data member was a
5985 constant. Although we check in the parser that the
5986 initializer is an integral constant expression, we do not
5987 simplify division-by-zero at the point at which it
5988 occurs. Therefore, in:
5990 struct S { static const int i = 7 / 0; };
5992 we issue an error at this point. It would
5993 probably be better to forbid division by zero in
5994 integral constant expressions. */
5995 if (DECL_EXTERNAL (decl) && init)
5997 error ("%qD cannot be initialized by a non-constant expression"
5998 " when being declared", decl);
5999 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6007 The memory occupied by any object of static storage
6008 duration is zero-initialized at program startup before
6009 any other initialization takes place.
6011 We cannot create an appropriate initializer until after
6012 the type of DECL is finalized. If DECL_INITIAL is set,
6013 then the DECL is statically initialized, and any
6014 necessary zero-initialization has already been performed. */
6015 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6016 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6017 /*nelts=*/NULL_TREE,
6018 /*static_storage_p=*/true);
6019 /* Remember that the initialization for this variable has
6021 DECL_INITIALIZED_P (decl) = 1;
6022 /* This declaration is the definition of this variable,
6023 unless we are initializing a static data member within
6024 the class specifier. */
6025 if (!DECL_EXTERNAL (decl))
6026 var_definition_p = true;
6028 /* If the variable has an array type, lay out the type, even if
6029 there is no initializer. It is valid to index through the
6030 array, and we must get TYPE_ALIGN set correctly on the array
6032 else if (TREE_CODE (type) == ARRAY_TYPE)
6035 if (!processing_template_decl
6036 && TREE_STATIC (decl)
6037 && !at_function_scope_p ()
6038 && current_function_decl == NULL)
6039 /* So decl is a global variable or a static member of a
6040 non local class. Record the types it uses
6041 so that we can decide later to emit debug info for them. */
6042 record_types_used_by_current_var_decl (decl);
6044 else if (TREE_CODE (decl) == FIELD_DECL
6045 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6046 error ("non-static data member %qD has Java class type", decl);
6048 /* Add this declaration to the statement-tree. This needs to happen
6049 after the call to check_initializer so that the DECL_EXPR for a
6050 reference temp is added before the DECL_EXPR for the reference itself. */
6051 if (at_function_scope_p ())
6052 add_decl_expr (decl);
6054 /* Let the middle end know about variables and functions -- but not
6055 static data members in uninstantiated class templates. */
6056 if (!saved_processing_template_decl
6057 && (TREE_CODE (decl) == VAR_DECL
6058 || TREE_CODE (decl) == FUNCTION_DECL))
6060 if (TREE_CODE (decl) == VAR_DECL)
6062 layout_var_decl (decl);
6063 maybe_commonize_var (decl);
6066 /* This needs to happen after the linkage is set. */
6067 determine_visibility (decl);
6069 if (var_definition_p && TREE_STATIC (decl))
6071 /* If a TREE_READONLY variable needs initialization
6072 at runtime, it is no longer readonly and we need to
6073 avoid MEM_READONLY_P being set on RTL created for it. */
6076 if (TREE_READONLY (decl))
6077 TREE_READONLY (decl) = 0;
6080 else if (was_readonly)
6081 TREE_READONLY (decl) = 1;
6084 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6086 /* Check for abstractness of the type. Notice that there is no
6087 need to strip array types here since the check for those types
6088 is already done within create_array_type_for_decl. */
6089 if (TREE_CODE (type) == FUNCTION_TYPE
6090 || TREE_CODE (type) == METHOD_TYPE)
6091 abstract_virtuals_error (decl, TREE_TYPE (type));
6093 abstract_virtuals_error (decl, type);
6095 if (TREE_TYPE (decl) == error_mark_node)
6096 /* No initialization required. */
6098 else if (TREE_CODE (decl) == FUNCTION_DECL)
6102 if (init == ridpointers[(int)RID_DEFAULT])
6104 /* An out-of-class default definition is defined at
6105 the point where it is explicitly defaulted. */
6106 if (DECL_DELETED_FN (decl))
6107 maybe_explain_implicit_delete (decl);
6108 else if (DECL_INITIAL (decl) == error_mark_node)
6109 synthesize_method (decl);
6112 error ("function %q#D is initialized like a variable", decl);
6114 /* else no initialization required. */
6116 else if (DECL_EXTERNAL (decl)
6117 && ! (DECL_LANG_SPECIFIC (decl)
6118 && DECL_NOT_REALLY_EXTERN (decl)))
6121 DECL_INITIAL (decl) = init;
6123 /* A variable definition. */
6124 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6125 /* Initialize the local variable. */
6126 initialize_local_var (decl, init);
6128 /* If a variable is defined, and then a subsequent
6129 definition with external linkage is encountered, we will
6130 get here twice for the same variable. We want to avoid
6131 calling expand_static_init more than once. For variables
6132 that are not static data members, we can call
6133 expand_static_init only when we actually process the
6134 initializer. It is not legal to redeclare a static data
6135 member, so this issue does not arise in that case. */
6136 else if (var_definition_p && TREE_STATIC (decl))
6137 expand_static_init (decl, init);
6140 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6141 reference, insert it in the statement-tree now. */
6143 push_cleanup (decl, cleanup, false);
6146 processing_template_decl = saved_processing_template_decl;
6149 TREE_READONLY (decl) = 1;
6152 /* Returns a declaration for a VAR_DECL as if:
6154 extern "C" TYPE NAME;
6156 had been seen. Used to create compiler-generated global
6160 declare_global_var (tree name, tree type)
6164 push_to_top_level ();
6165 decl = build_decl (input_location, VAR_DECL, name, type);
6166 TREE_PUBLIC (decl) = 1;
6167 DECL_EXTERNAL (decl) = 1;
6168 DECL_ARTIFICIAL (decl) = 1;
6169 /* If the user has explicitly declared this variable (perhaps
6170 because the code we are compiling is part of a low-level runtime
6171 library), then it is possible that our declaration will be merged
6172 with theirs by pushdecl. */
6173 decl = pushdecl (decl);
6174 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6175 pop_from_top_level ();
6180 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6181 if "__cxa_atexit" is not being used) corresponding to the function
6182 to be called when the program exits. */
6185 get_atexit_fn_ptr_type (void)
6189 if (!atexit_fn_ptr_type_node)
6192 if (flag_use_cxa_atexit
6193 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6194 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6195 arg_type = ptr_type_node;
6197 /* The parameter to "atexit" is "void (*)(void)". */
6198 arg_type = NULL_TREE;
6200 fn_type = build_function_type_list (void_type_node,
6201 arg_type, NULL_TREE);
6202 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6205 return atexit_fn_ptr_type_node;
6208 /* Returns a pointer to the `atexit' function. Note that if
6209 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6210 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6213 get_atexit_node (void)
6219 bool use_aeabi_atexit;
6224 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6226 /* The declaration for `__cxa_atexit' is:
6228 int __cxa_atexit (void (*)(void *), void *, void *)
6230 We build up the argument types and then the function type
6232 tree argtype0, argtype1, argtype2;
6234 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6235 /* First, build the pointer-to-function type for the first
6237 fn_ptr_type = get_atexit_fn_ptr_type ();
6238 /* Then, build the rest of the argument types. */
6239 argtype2 = ptr_type_node;
6240 if (use_aeabi_atexit)
6242 argtype1 = fn_ptr_type;
6243 argtype0 = ptr_type_node;
6247 argtype1 = ptr_type_node;
6248 argtype0 = fn_ptr_type;
6250 /* And the final __cxa_atexit type. */
6251 fn_type = build_function_type_list (integer_type_node,
6252 argtype0, argtype1, argtype2,
6254 fn_ptr_type = build_pointer_type (fn_type);
6255 if (use_aeabi_atexit)
6256 name = "__aeabi_atexit";
6258 name = "__cxa_atexit";
6262 /* The declaration for `atexit' is:
6264 int atexit (void (*)());
6266 We build up the argument types and then the function type
6268 fn_ptr_type = get_atexit_fn_ptr_type ();
6269 /* Build the final atexit type. */
6270 fn_type = build_function_type_list (integer_type_node,
6271 fn_ptr_type, NULL_TREE);
6275 /* Now, build the function declaration. */
6276 push_lang_context (lang_name_c);
6277 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6278 mark_used (atexit_fndecl);
6279 pop_lang_context ();
6280 atexit_node = decay_conversion (atexit_fndecl);
6285 /* Returns the __dso_handle VAR_DECL. */
6288 get_dso_handle_node (void)
6290 if (dso_handle_node)
6291 return dso_handle_node;
6293 /* Declare the variable. */
6294 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6297 return dso_handle_node;
6300 /* Begin a new function with internal linkage whose job will be simply
6301 to destroy some particular variable. */
6303 static GTY(()) int start_cleanup_cnt;
6306 start_cleanup_fn (void)
6311 bool use_cxa_atexit = flag_use_cxa_atexit
6312 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6314 push_to_top_level ();
6316 /* No need to mangle this. */
6317 push_lang_context (lang_name_c);
6319 /* Build the name of the function. */
6320 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6321 /* Build the function declaration. */
6322 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6323 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6324 /* It's a function with internal linkage, generated by the
6326 TREE_PUBLIC (fndecl) = 0;
6327 DECL_ARTIFICIAL (fndecl) = 1;
6328 /* Make the function `inline' so that it is only emitted if it is
6329 actually needed. It is unlikely that it will be inlined, since
6330 it is only called via a function pointer, but we avoid unnecessary
6331 emissions this way. */
6332 DECL_DECLARED_INLINE_P (fndecl) = 1;
6333 DECL_INTERFACE_KNOWN (fndecl) = 1;
6334 /* Build the parameter. */
6339 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6340 DECL_CONTEXT (parmdecl) = fndecl;
6341 TREE_USED (parmdecl) = 1;
6342 DECL_READ_P (parmdecl) = 1;
6343 DECL_ARGUMENTS (fndecl) = parmdecl;
6347 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6349 pop_lang_context ();
6351 return current_function_decl;
6354 /* Finish the cleanup function begun by start_cleanup_fn. */
6357 end_cleanup_fn (void)
6359 expand_or_defer_fn (finish_function (0));
6361 pop_from_top_level ();
6364 /* Generate code to handle the destruction of DECL, an object with
6365 static storage duration. */
6368 register_dtor_fn (tree decl)
6375 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6377 type = TREE_TYPE (decl);
6378 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6379 return void_zero_node;
6381 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6382 a class object, we can just pass the destructor to
6383 "__cxa_atexit"; we don't have to build a temporary function to do
6385 use_dtor = (flag_use_cxa_atexit
6386 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6387 && CLASS_TYPE_P (type));
6392 /* Find the destructor. */
6393 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6394 gcc_assert (idx >= 0);
6395 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6396 /* Make sure it is accessible. */
6397 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6401 /* Call build_cleanup before we enter the anonymous function so
6402 that any access checks will be done relative to the current
6403 scope, rather than the scope of the anonymous function. */
6404 build_cleanup (decl);
6406 /* Now start the function. */
6407 cleanup = start_cleanup_fn ();
6409 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6410 to the original function, rather than the anonymous one. That
6411 will make the back end think that nested functions are in use,
6412 which causes confusion. */
6413 push_deferring_access_checks (dk_no_check);
6414 fcall = build_cleanup (decl);
6415 pop_deferring_access_checks ();
6417 /* Create the body of the anonymous function. */
6418 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6419 finish_expr_stmt (fcall);
6420 finish_compound_stmt (compound_stmt);
6424 /* Call atexit with the cleanup function. */
6425 mark_used (cleanup);
6426 cleanup = build_address (cleanup);
6427 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6433 /* We must convert CLEANUP to the type that "__cxa_atexit"
6435 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6436 /* "__cxa_atexit" will pass the address of DECL to the
6437 cleanup function. */
6439 addr = build_address (decl);
6440 /* The declared type of the parameter to "__cxa_atexit" is
6441 "void *". For plain "T*", we could just let the
6442 machinery in cp_build_function_call convert it -- but if the
6443 type is "cv-qualified T *", then we need to convert it
6444 before passing it in, to avoid spurious errors. */
6445 addr = build_nop (ptr_type_node, addr);
6448 /* Since the cleanup functions we build ignore the address
6449 they're given, there's no reason to pass the actual address
6450 in, and, in general, it's cheaper to pass NULL than any
6452 addr = null_pointer_node;
6453 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6454 tf_warning_or_error);
6455 if (targetm.cxx.use_aeabi_atexit ())
6468 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6469 arg0, arg1, arg2, NULL_TREE);
6472 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6473 is its initializer. Generate code to handle the construction
6474 and destruction of DECL. */
6477 expand_static_init (tree decl, tree init)
6479 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6480 gcc_assert (TREE_STATIC (decl));
6482 /* Some variables require no dynamic initialization. */
6484 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6487 if (DECL_FUNCTION_SCOPE_P (decl))
6489 /* Emit code to perform this initialization but once. */
6490 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6491 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6492 tree guard, guard_addr;
6493 tree acquire_fn, release_fn, abort_fn;
6496 /* Emit code to perform this initialization but once. This code
6499 static <type> guard;
6500 if (!guard.first_byte) {
6501 if (__cxa_guard_acquire (&guard)) {
6504 // Do initialization.
6505 flag = true; __cxa_guard_release (&guard);
6506 // Register variable for destruction at end of program.
6508 if (!flag) __cxa_guard_abort (&guard);
6512 Note that the `flag' variable is only set to 1 *after* the
6513 initialization is complete. This ensures that an exception,
6514 thrown during the construction, will cause the variable to
6515 reinitialized when we pass through this code again, as per:
6519 If the initialization exits by throwing an exception, the
6520 initialization is not complete, so it will be tried again
6521 the next time control enters the declaration.
6523 This process should be thread-safe, too; multiple threads
6524 should not be able to initialize the variable more than
6527 /* Create the guard variable. */
6528 guard = get_guard (decl);
6530 /* This optimization isn't safe on targets with relaxed memory
6531 consistency. On such targets we force synchronization in
6532 __cxa_guard_acquire. */
6533 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6535 /* Begin the conditional initialization. */
6536 if_stmt = begin_if_stmt ();
6537 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6538 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6541 if (flag_threadsafe_statics)
6543 guard_addr = build_address (guard);
6545 acquire_fn = get_identifier ("__cxa_guard_acquire");
6546 release_fn = get_identifier ("__cxa_guard_release");
6547 abort_fn = get_identifier ("__cxa_guard_abort");
6548 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6550 tree vfntype = build_function_type_list (void_type_node,
6551 TREE_TYPE (guard_addr),
6553 acquire_fn = push_library_fn
6554 (acquire_fn, build_function_type_list (integer_type_node,
6555 TREE_TYPE (guard_addr),
6558 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6559 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6563 release_fn = identifier_global_value (release_fn);
6564 abort_fn = identifier_global_value (abort_fn);
6567 inner_if_stmt = begin_if_stmt ();
6568 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6571 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6572 begin = get_target_expr (boolean_false_node);
6573 flag = TARGET_EXPR_SLOT (begin);
6575 TARGET_EXPR_CLEANUP (begin)
6576 = build3 (COND_EXPR, void_type_node, flag,
6578 build_call_n (abort_fn, 1, guard_addr));
6579 CLEANUP_EH_ONLY (begin) = 1;
6581 /* Do the initialization itself. */
6582 init = add_stmt_to_compound (begin, init);
6583 init = add_stmt_to_compound
6584 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6585 init = add_stmt_to_compound
6586 (init, build_call_n (release_fn, 1, guard_addr));
6589 init = add_stmt_to_compound (init, set_guard (guard));
6591 /* Use atexit to register a function for destroying this static
6593 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6595 finish_expr_stmt (init);
6597 if (flag_threadsafe_statics)
6599 finish_compound_stmt (inner_then_clause);
6600 finish_then_clause (inner_if_stmt);
6601 finish_if_stmt (inner_if_stmt);
6604 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6606 finish_compound_stmt (then_clause);
6607 finish_then_clause (if_stmt);
6608 finish_if_stmt (if_stmt);
6612 static_aggregates = tree_cons (init, decl, static_aggregates);
6616 /* Make TYPE a complete type based on INITIAL_VALUE.
6617 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6618 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6619 3 if the initializer list is empty (in pedantic mode). */
6622 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6625 tree type, elt_type;
6629 unsigned HOST_WIDE_INT i;
6632 /* An array of character type can be initialized from a
6633 brace-enclosed string constant.
6635 FIXME: this code is duplicated from reshape_init. Probably
6636 we should just call reshape_init here? */
6637 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6638 && TREE_CODE (initial_value) == CONSTRUCTOR
6639 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6641 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6642 tree value = VEC_index (constructor_elt, v, 0)->value;
6644 if (TREE_CODE (value) == STRING_CST
6645 && VEC_length (constructor_elt, v) == 1)
6646 initial_value = value;
6649 /* If any of the elements are parameter packs, we can't actually
6650 complete this type now because the array size is dependent. */
6651 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6653 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6656 if (PACK_EXPANSION_P (value))
6662 failure = complete_array_type (ptype, initial_value, do_default);
6664 /* We can create the array before the element type is complete, which
6665 means that we didn't have these two bits set in the original type
6666 either. In completing the type, we are expected to propagate these
6667 bits. See also complete_type which does the same thing for arrays
6670 if (TYPE_DOMAIN (type))
6672 elt_type = TREE_TYPE (type);
6673 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6674 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6675 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6681 /* Return zero if something is declared to be a member of type
6682 CTYPE when in the context of CUR_TYPE. STRING is the error
6683 message to print in that case. Otherwise, quietly return 1. */
6686 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6688 if (ctype && ctype != cur_type)
6690 if (flags == DTOR_FLAG)
6691 error ("destructor for alien class %qT cannot be a member", ctype);
6693 error ("constructor for alien class %qT cannot be a member", ctype);
6699 /* Subroutine of `grokdeclarator'. */
6701 /* Generate errors possibly applicable for a given set of specifiers.
6702 This is for ARM $7.1.2. */
6705 bad_specifiers (tree object,
6706 enum bad_spec_place type,
6717 error ("%qD declared as a %<virtual%> variable", object);
6719 error ("%qD declared as an %<inline%> variable", object);
6721 error ("%<const%> and %<volatile%> function specifiers on "
6722 "%qD invalid in variable declaration", object);
6726 error ("%qD declared as a %<virtual%> parameter", object);
6728 error ("%qD declared as an %<inline%> parameter", object);
6730 error ("%<const%> and %<volatile%> function specifiers on "
6731 "%qD invalid in parameter declaration", object);
6735 error ("%qD declared as a %<virtual%> type", object);
6737 error ("%qD declared as an %<inline%> type", object);
6739 error ("%<const%> and %<volatile%> function specifiers on "
6740 "%qD invalid in type declaration", object);
6744 error ("%qD declared as a %<virtual%> field", object);
6746 error ("%qD declared as an %<inline%> field", object);
6748 error ("%<const%> and %<volatile%> function specifiers on "
6749 "%qD invalid in field declaration", object);
6755 error ("%q+D declared as a friend", object);
6757 && (TREE_CODE (object) == TYPE_DECL
6758 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6759 && !TYPE_REFFN_P (TREE_TYPE (object))
6760 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6761 error ("%q+D declared with an exception specification", object);
6764 /* DECL is a member function or static data member and is presently
6765 being defined. Check that the definition is taking place in a
6769 check_class_member_definition_namespace (tree decl)
6771 /* These checks only apply to member functions and static data
6773 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6774 || TREE_CODE (decl) == VAR_DECL);
6775 /* We check for problems with specializations in pt.c in
6776 check_specialization_namespace, where we can issue better
6778 if (processing_specialization)
6780 /* There are no restrictions on the placement of
6781 explicit instantiations. */
6782 if (processing_explicit_instantiation)
6786 A member function definition that appears outside of the
6787 class definition shall appear in a namespace scope enclosing
6788 the class definition.
6792 The definition for a static data member shall appear in a
6793 namespace scope enclosing the member's class definition. */
6794 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6795 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6796 decl, DECL_CONTEXT (decl));
6799 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6800 METHOD_TYPE for a non-static member function; QUALS are the
6801 cv-qualifiers that apply to the function. */
6804 build_this_parm (tree type, cp_cv_quals quals)
6809 cp_cv_quals this_quals;
6811 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6812 /* The `this' parameter is implicitly `const'; it cannot be
6814 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6815 qual_type = cp_build_qualified_type (this_type, this_quals);
6816 parm = build_artificial_parm (this_identifier, qual_type);
6817 cp_apply_type_quals_to_decl (this_quals, parm);
6821 /* CTYPE is class type, or null if non-class.
6822 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6824 DECLARATOR is the function's name.
6825 PARMS is a chain of PARM_DECLs for the function.
6826 VIRTUALP is truthvalue of whether the function is virtual or not.
6827 FLAGS are to be passed through to `grokclassfn'.
6828 QUALS are qualifiers indicating whether the function is `const'
6830 RAISES is a list of exceptions that this function can raise.
6831 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6832 not look, and -1 if we should not call `grokclassfn' at all.
6834 SFK is the kind of special function (if any) for the new function.
6836 Returns `NULL_TREE' if something goes wrong, after issuing
6837 applicable error messages. */
6840 grokfndecl (tree ctype,
6844 tree orig_declarator,
6846 enum overload_flags flags,
6853 special_function_kind sfk,
6858 location_t location)
6861 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6865 type = build_exception_variant (type, raises);
6867 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6869 /* If we have an explicit location, use it, otherwise use whatever
6870 build_lang_decl used (probably input_location). */
6871 if (location != UNKNOWN_LOCATION)
6872 DECL_SOURCE_LOCATION (decl) = location;
6874 if (TREE_CODE (type) == METHOD_TYPE)
6877 parm = build_this_parm (type, quals);
6878 DECL_CHAIN (parm) = parms;
6881 DECL_ARGUMENTS (decl) = parms;
6882 for (t = parms; t; t = DECL_CHAIN (t))
6883 DECL_CONTEXT (t) = decl;
6884 /* Propagate volatile out from type to decl. */
6885 if (TYPE_VOLATILE (type))
6886 TREE_THIS_VOLATILE (decl) = 1;
6888 /* Setup decl according to sfk. */
6891 case sfk_constructor:
6892 case sfk_copy_constructor:
6893 case sfk_move_constructor:
6894 DECL_CONSTRUCTOR_P (decl) = 1;
6896 case sfk_destructor:
6897 DECL_DESTRUCTOR_P (decl) = 1;
6903 /* If pointers to member functions use the least significant bit to
6904 indicate whether a function is virtual, ensure a pointer
6905 to this function will have that bit clear. */
6906 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6907 && TREE_CODE (type) == METHOD_TYPE
6908 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6909 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6912 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6916 ("defining explicit specialization %qD in friend declaration",
6920 tree fns = TREE_OPERAND (orig_declarator, 0);
6921 tree args = TREE_OPERAND (orig_declarator, 1);
6923 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6925 /* Something like `template <class T> friend void f<T>()'. */
6926 error ("invalid use of template-id %qD in declaration "
6927 "of primary template",
6933 /* A friend declaration of the form friend void f<>(). Record
6934 the information in the TEMPLATE_ID_EXPR. */
6935 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6937 if (TREE_CODE (fns) == COMPONENT_REF)
6939 /* Due to bison parser ickiness, we will have already looked
6940 up an operator_name or PFUNCNAME within the current class
6941 (see template_id in parse.y). If the current class contains
6942 such a name, we'll get a COMPONENT_REF here. Undo that. */
6944 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6945 == current_class_type);
6946 fns = TREE_OPERAND (fns, 1);
6948 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6949 || TREE_CODE (fns) == OVERLOAD);
6950 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6952 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6953 if (TREE_PURPOSE (t)
6954 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6956 error ("default arguments are not allowed in declaration "
6957 "of friend template specialization %qD",
6964 error ("%<inline%> is not allowed in declaration of friend "
6965 "template specialization %qD",
6972 /* If this decl has namespace scope, set that up. */
6974 set_decl_namespace (decl, in_namespace, friendp);
6976 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6978 /* `main' and builtins have implicit 'C' linkage. */
6979 if ((MAIN_NAME_P (declarator)
6980 || (IDENTIFIER_LENGTH (declarator) > 10
6981 && IDENTIFIER_POINTER (declarator)[0] == '_'
6982 && IDENTIFIER_POINTER (declarator)[1] == '_'
6983 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6984 && current_lang_name == lang_name_cplusplus
6985 && ctype == NULL_TREE
6986 && DECL_FILE_SCOPE_P (decl))
6987 SET_DECL_LANGUAGE (decl, lang_c);
6989 /* Should probably propagate const out from type to decl I bet (mrs). */
6992 DECL_STATIC_FUNCTION_P (decl) = 1;
6993 DECL_CONTEXT (decl) = ctype;
6998 DECL_CONTEXT (decl) = ctype;
7000 check_class_member_definition_namespace (decl);
7003 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7005 if (processing_template_decl)
7006 error ("cannot declare %<::main%> to be a template");
7008 error ("cannot declare %<::main%> to be inline");
7010 error ("cannot declare %<::main%> to be static");
7015 /* Members of anonymous types and local classes have no linkage; make
7016 them internal. If a typedef is made later, this will be changed. */
7017 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7018 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7021 if (publicp && cxx_dialect == cxx98)
7023 /* [basic.link]: A name with no linkage (notably, the name of a class
7024 or enumeration declared in a local scope) shall not be used to
7025 declare an entity with linkage.
7027 DR 757 relaxes this restriction for C++0x. */
7028 t = no_linkage_check (TREE_TYPE (decl),
7029 /*relaxed_p=*/false);
7032 if (TYPE_ANONYMOUS_P (t))
7034 if (DECL_EXTERN_C_P (decl))
7035 /* Allow this; it's pretty common in C. */;
7038 permerror (input_location, "anonymous type with no linkage "
7039 "used to declare function %q#D with linkage",
7041 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7042 permerror (input_location, "%q+#D does not refer to the unqualified "
7043 "type, so it is not used for linkage",
7048 permerror (input_location, "type %qT with no linkage used to "
7049 "declare function %q#D with linkage", t, decl);
7053 TREE_PUBLIC (decl) = publicp;
7056 DECL_INTERFACE_KNOWN (decl) = 1;
7057 DECL_NOT_REALLY_EXTERN (decl) = 1;
7060 /* If the declaration was declared inline, mark it as such. */
7062 DECL_DECLARED_INLINE_P (decl) = 1;
7064 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7066 DECL_EXTERNAL (decl) = 1;
7067 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7070 ? G_("static member function %qD cannot have cv-qualifier")
7071 : G_("non-member function %qD cannot have cv-qualifier"),
7073 quals = TYPE_UNQUALIFIED;
7076 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7077 && !grok_op_properties (decl, /*complain=*/true))
7081 /* Make the init_value nonzero so pushdecl knows this is not
7082 tentative. error_mark_node is replaced later with the BLOCK. */
7083 DECL_INITIAL (decl) = error_mark_node;
7085 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7086 TREE_NOTHROW (decl) = 1;
7088 /* Caller will do the rest of this. */
7092 if (ctype != NULL_TREE)
7093 grokclassfn (ctype, decl, flags);
7095 decl = check_explicit_specialization (orig_declarator, decl,
7098 4 * (friendp != 0));
7099 if (decl == error_mark_node)
7104 cplus_decl_attributes (&decl, *attrlist, 0);
7105 *attrlist = NULL_TREE;
7108 /* Check main's type after attributes have been applied. */
7109 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7111 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7114 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7116 error ("%<::main%> must return %<int%>");
7117 newtype = build_function_type (integer_type_node, oldtypeargs);
7118 TREE_TYPE (decl) = newtype;
7121 check_main_parameter_types (decl);
7124 if (ctype != NULL_TREE
7125 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7128 tree old_decl = check_classfn (ctype, decl,
7129 (processing_template_decl
7130 > template_class_depth (ctype))
7131 ? current_template_parms
7134 if (old_decl == error_mark_node)
7142 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7143 /* Because grokfndecl is always supposed to return a
7144 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7145 here. We depend on our callers to figure out that its
7146 really a template that's being returned. */
7147 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7149 if (DECL_STATIC_FUNCTION_P (old_decl)
7150 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7151 /* Remove the `this' parm added by grokclassfn.
7152 XXX Isn't this done in start_function, too? */
7153 revert_static_member_fn (decl);
7154 if (DECL_ARTIFICIAL (old_decl))
7156 error ("definition of implicitly-declared %qD", old_decl);
7160 /* Since we've smashed OLD_DECL to its
7161 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7162 if (TREE_CODE (decl) == TEMPLATE_DECL)
7163 decl = DECL_TEMPLATE_RESULT (decl);
7165 /* Attempt to merge the declarations. This can fail, in
7166 the case of some invalid specialization declarations. */
7167 pushed_scope = push_scope (ctype);
7168 ok = duplicate_decls (decl, old_decl, friendp);
7170 pop_scope (pushed_scope);
7173 error ("no %q#D member function declared in class %qT",
7181 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7184 if (ctype == NULL_TREE || check)
7188 DECL_VIRTUAL_P (decl) = 1;
7193 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7194 the linkage that DECL will receive in the object file. */
7197 set_linkage_for_static_data_member (tree decl)
7199 /* A static data member always has static storage duration and
7200 external linkage. Note that static data members are forbidden in
7201 local classes -- the only situation in which a class has
7202 non-external linkage. */
7203 TREE_PUBLIC (decl) = 1;
7204 TREE_STATIC (decl) = 1;
7205 /* For non-template classes, static data members are always put
7206 out in exactly those files where they are defined, just as
7207 with ordinary namespace-scope variables. */
7208 if (!processing_template_decl)
7209 DECL_INTERFACE_KNOWN (decl) = 1;
7212 /* Create a VAR_DECL named NAME with the indicated TYPE.
7214 If SCOPE is non-NULL, it is the class type or namespace containing
7215 the variable. If SCOPE is NULL, the variable should is created in
7216 the innermost enclosings scope. */
7219 grokvardecl (tree type,
7221 const cp_decl_specifier_seq *declspecs,
7227 tree explicit_scope;
7229 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7231 /* Compute the scope in which to place the variable, but remember
7232 whether or not that scope was explicitly specified by the user. */
7233 explicit_scope = scope;
7236 /* An explicit "extern" specifier indicates a namespace-scope
7238 if (declspecs->storage_class == sc_extern)
7239 scope = current_decl_namespace ();
7240 else if (!at_function_scope_p ())
7241 scope = current_scope ();
7245 && (/* If the variable is a namespace-scope variable declared in a
7246 template, we need DECL_LANG_SPECIFIC. */
7247 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7248 /* Similarly for namespace-scope variables with language linkage
7250 || (TREE_CODE (scope) == NAMESPACE_DECL
7251 && current_lang_name != lang_name_cplusplus)
7252 /* Similarly for static data members. */
7254 decl = build_lang_decl (VAR_DECL, name, type);
7256 decl = build_decl (input_location, VAR_DECL, name, type);
7258 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7259 set_decl_namespace (decl, explicit_scope, 0);
7261 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7263 if (declspecs->storage_class == sc_extern)
7265 DECL_THIS_EXTERN (decl) = 1;
7266 DECL_EXTERNAL (decl) = !initialized;
7269 if (DECL_CLASS_SCOPE_P (decl))
7271 set_linkage_for_static_data_member (decl);
7272 /* This function is only called with out-of-class definitions. */
7273 DECL_EXTERNAL (decl) = 0;
7274 check_class_member_definition_namespace (decl);
7276 /* At top level, either `static' or no s.c. makes a definition
7277 (perhaps tentative), and absence of `static' makes it public. */
7278 else if (toplevel_bindings_p ())
7280 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7281 && (DECL_THIS_EXTERN (decl) || ! constp));
7282 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7284 /* Not at top level, only `static' makes a static definition. */
7287 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7288 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7291 if (declspecs->specs[(int)ds_thread])
7292 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7294 /* If the type of the decl has no linkage, make sure that we'll
7295 notice that in mark_used. */
7296 if (cxx_dialect > cxx98
7297 && decl_linkage (decl) != lk_none
7298 && DECL_LANG_SPECIFIC (decl) == NULL
7299 && !DECL_EXTERN_C_P (decl)
7300 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7301 retrofit_lang_decl (decl);
7303 if (TREE_PUBLIC (decl))
7305 /* [basic.link]: A name with no linkage (notably, the name of a class
7306 or enumeration declared in a local scope) shall not be used to
7307 declare an entity with linkage.
7309 DR 757 relaxes this restriction for C++0x. */
7310 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7311 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7314 if (TYPE_ANONYMOUS_P (t))
7316 if (DECL_EXTERN_C_P (decl))
7317 /* Allow this; it's pretty common in C. */
7321 /* DRs 132, 319 and 389 seem to indicate types with
7322 no linkage can only be used to declare extern "C"
7323 entities. Since it's not always an error in the
7324 ISO C++ 90 Standard, we only issue a warning. */
7325 warning (0, "anonymous type with no linkage used to declare "
7326 "variable %q#D with linkage", decl);
7327 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7328 warning (0, "%q+#D does not refer to the unqualified "
7329 "type, so it is not used for linkage",
7334 warning (0, "type %qT with no linkage used to declare variable "
7335 "%q#D with linkage", t, decl);
7339 DECL_INTERFACE_KNOWN (decl) = 1;
7344 /* Create and return a canonical pointer to member function type, for
7345 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7348 build_ptrmemfunc_type (tree type)
7352 tree unqualified_variant = NULL_TREE;
7354 if (type == error_mark_node)
7357 /* If a canonical type already exists for this type, use it. We use
7358 this method instead of type_hash_canon, because it only does a
7359 simple equality check on the list of field members. */
7361 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7364 /* Make sure that we always have the unqualified pointer-to-member
7366 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7368 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7370 t = make_class_type (RECORD_TYPE);
7371 xref_basetypes (t, NULL_TREE);
7373 /* Let the front end know this is a pointer to member function... */
7374 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7375 /* ... and not really a class type. */
7376 SET_CLASS_TYPE_P (t, 0);
7378 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7381 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7383 DECL_CHAIN (field) = fields;
7386 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7388 /* Zap out the name so that the back end will give us the debugging
7389 information for this anonymous RECORD_TYPE. */
7390 TYPE_NAME (t) = NULL_TREE;
7392 /* If this is not the unqualified form of this pointer-to-member
7393 type, set the TYPE_MAIN_VARIANT for this type to be the
7394 unqualified type. Since they are actually RECORD_TYPEs that are
7395 not variants of each other, we must do this manually.
7396 As we just built a new type there is no need to do yet another copy. */
7397 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7399 int type_quals = cp_type_quals (type);
7400 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7401 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7402 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7403 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7404 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7405 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7406 TREE_TYPE (TYPE_BINFO (t)) = t;
7409 /* Cache this pointer-to-member type so that we can find it again
7411 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7413 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7414 SET_TYPE_STRUCTURAL_EQUALITY (t);
7415 else if (TYPE_CANONICAL (type) != type)
7416 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7421 /* Create and return a pointer to data member type. */
7424 build_ptrmem_type (tree class_type, tree member_type)
7426 if (TREE_CODE (member_type) == METHOD_TYPE)
7428 cp_cv_quals quals = type_memfn_quals (member_type);
7429 member_type = build_memfn_type (member_type, class_type, quals);
7430 return build_ptrmemfunc_type (build_pointer_type (member_type));
7434 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7435 return build_offset_type (class_type, member_type);
7439 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7440 Check to see that the definition is valid. Issue appropriate error
7441 messages. Return 1 if the definition is particularly bad, or 0
7445 check_static_variable_definition (tree decl, tree type)
7447 /* If DECL is declared constexpr, we'll do the appropriate checks
7448 in check_initializer. */
7449 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7451 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7453 if (literal_type_p (type))
7454 error ("%<constexpr%> needed for in-class initialization of static "
7455 "data member %q#D of non-integral type", decl);
7457 error ("in-class initialization of static data member %q#D of "
7458 "non-literal type", decl);
7462 /* Motion 10 at San Diego: If a static const integral data member is
7463 initialized with an integral constant expression, the initializer
7464 may appear either in the declaration (within the class), or in
7465 the definition, but not both. If it appears in the class, the
7466 member is a member constant. The file-scope definition is always
7468 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7470 error ("invalid in-class initialization of static data member "
7471 "of non-integral type %qT",
7475 else if (!CP_TYPE_CONST_P (type))
7476 error ("ISO C++ forbids in-class initialization of non-const "
7477 "static member %qD",
7479 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7480 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7481 "%qD of non-integral type %qT", decl, type);
7486 /* Given the SIZE (i.e., number of elements) in an array, compute an
7487 appropriate index type for the array. If non-NULL, NAME is the
7488 name of the thing being declared. */
7491 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7496 tree abi_1_itype = NULL_TREE;
7498 if (error_operand_p (size))
7499 return error_mark_node;
7501 type = TREE_TYPE (size);
7502 /* type_dependent_expression_p? */
7503 if (!dependent_type_p (type))
7505 mark_rvalue_use (size);
7507 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7508 && TREE_SIDE_EFFECTS (size))
7509 /* In C++98, we mark a non-constant array bound with a magic
7510 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7513 size = fold_non_dependent_expr (size);
7515 if (CLASS_TYPE_P (type)
7516 && CLASSTYPE_LITERAL_P (type))
7518 size = build_expr_type_conversion (WANT_INT, size, true);
7519 if (size == error_mark_node)
7520 return error_mark_node;
7521 type = TREE_TYPE (size);
7524 size = maybe_constant_value (size);
7527 if (error_operand_p (size))
7528 return error_mark_node;
7530 /* The array bound must be an integer type. */
7531 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7533 if (!(complain & tf_error))
7534 return error_mark_node;
7536 error ("size of array %qD has non-integral type %qT", name, type);
7538 error ("size of array has non-integral type %qT", type);
7539 size = integer_one_node;
7540 type = TREE_TYPE (size);
7544 /* A type is dependent if it is...an array type constructed from any
7545 dependent type or whose size is specified by a constant expression
7546 that is value-dependent. */
7547 /* We can only call value_dependent_expression_p on integral constant
7548 expressions; treat non-constant expressions as dependent, too. */
7549 if (processing_template_decl
7550 && (dependent_type_p (type)
7551 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7553 /* We cannot do any checking for a SIZE that isn't known to be
7554 constant. Just build the index type and mark that it requires
7555 structural equality checks. */
7556 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7557 size, integer_one_node));
7558 TYPE_DEPENDENT_P (itype) = 1;
7559 TYPE_DEPENDENT_P_VALID (itype) = 1;
7560 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7564 if (!abi_version_at_least (2) && processing_template_decl)
7565 /* For abi-1, we handled all instances in templates the same way,
7566 even when they were non-dependent. This affects the manglings
7567 produced. So, we do the normal checking for non-dependent
7568 sizes, but at the end we'll return the same type that abi-1
7569 would have, but with TYPE_CANONICAL set to the "right"
7570 value that the current ABI would provide. */
7571 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7572 osize, integer_one_node));
7574 /* Normally, the array-bound will be a constant. */
7575 if (TREE_CODE (size) == INTEGER_CST)
7577 /* Check to see if the array bound overflowed. Make that an
7578 error, no matter how generous we're being. */
7579 constant_expression_error (size);
7581 /* An array must have a positive number of elements. */
7582 if (INT_CST_LT (size, integer_zero_node))
7584 if (!(complain & tf_error))
7585 return error_mark_node;
7587 error ("size of array %qD is negative", name);
7589 error ("size of array is negative");
7590 size = integer_one_node;
7592 /* As an extension we allow zero-sized arrays. */
7593 else if (integer_zerop (size))
7595 if (!(complain & tf_error))
7596 /* We must fail if performing argument deduction (as
7597 indicated by the state of complain), so that
7598 another substitution can be found. */
7599 return error_mark_node;
7600 else if (in_system_header)
7601 /* Allow them in system headers because glibc uses them. */;
7603 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7605 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7608 else if (TREE_CONSTANT (size)
7609 /* We don't allow VLAs at non-function scopes, or during
7610 tentative template substitution. */
7611 || !at_function_scope_p () || !(complain & tf_error))
7613 if (!(complain & tf_error))
7614 return error_mark_node;
7615 /* `(int) &fn' is not a valid array bound. */
7617 error ("size of array %qD is not an integral constant-expression",
7620 error ("size of array is not an integral constant-expression");
7621 size = integer_one_node;
7623 else if (pedantic && warn_vla != 0)
7626 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7628 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7630 else if (warn_vla > 0)
7634 "variable length array %qD is used", name);
7637 "variable length array is used");
7640 if (processing_template_decl && !TREE_CONSTANT (size))
7641 /* A variable sized array. */
7642 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7645 HOST_WIDE_INT saved_processing_template_decl;
7647 /* Compute the index of the largest element in the array. It is
7648 one less than the number of elements in the array. We save
7649 and restore PROCESSING_TEMPLATE_DECL so that computations in
7650 cp_build_binary_op will be appropriately folded. */
7651 saved_processing_template_decl = processing_template_decl;
7652 processing_template_decl = 0;
7653 itype = cp_build_binary_op (input_location,
7655 cp_convert (ssizetype, size),
7656 cp_convert (ssizetype, integer_one_node),
7657 tf_warning_or_error);
7658 itype = fold (itype);
7659 processing_template_decl = saved_processing_template_decl;
7661 if (!TREE_CONSTANT (itype))
7662 /* A variable sized array. */
7663 itype = variable_size (itype);
7664 /* Make sure that there was no overflow when creating to a signed
7665 index type. (For example, on a 32-bit machine, an array with
7666 size 2^32 - 1 is too big.) */
7667 else if (TREE_CODE (itype) == INTEGER_CST
7668 && TREE_OVERFLOW (itype))
7670 if (!(complain & tf_error))
7671 return error_mark_node;
7672 error ("overflow in array dimension");
7673 TREE_OVERFLOW (itype) = 0;
7677 /* Create and return the appropriate index type. */
7680 tree t = build_index_type (itype);
7681 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7682 itype = abi_1_itype;
7685 itype = build_index_type (itype);
7687 /* If the index type were dependent, we would have returned early, so
7688 remember that it isn't. */
7689 TYPE_DEPENDENT_P (itype) = 0;
7690 TYPE_DEPENDENT_P_VALID (itype) = 1;
7694 /* Returns the scope (if any) in which the entity declared by
7695 DECLARATOR will be located. If the entity was declared with an
7696 unqualified name, NULL_TREE is returned. */
7699 get_scope_of_declarator (const cp_declarator *declarator)
7701 while (declarator && declarator->kind != cdk_id)
7702 declarator = declarator->declarator;
7704 /* If the declarator-id is a SCOPE_REF, the scope in which the
7705 declaration occurs is the first operand. */
7707 && declarator->u.id.qualifying_scope)
7708 return declarator->u.id.qualifying_scope;
7710 /* Otherwise, the declarator is not a qualified name; the entity will
7711 be declared in the current scope. */
7715 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7716 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7720 create_array_type_for_decl (tree name, tree type, tree size)
7722 tree itype = NULL_TREE;
7724 /* If things have already gone awry, bail now. */
7725 if (type == error_mark_node || size == error_mark_node)
7726 return error_mark_node;
7728 /* If there are some types which cannot be array elements,
7729 issue an error-message and return. */
7730 switch (TREE_CODE (type))
7734 error ("declaration of %qD as array of void", name);
7736 error ("creating array of void");
7737 return error_mark_node;
7741 error ("declaration of %qD as array of functions", name);
7743 error ("creating array of functions");
7744 return error_mark_node;
7746 case REFERENCE_TYPE:
7748 error ("declaration of %qD as array of references", name);
7750 error ("creating array of references");
7751 return error_mark_node;
7755 error ("declaration of %qD as array of function members", name);
7757 error ("creating array of function members");
7758 return error_mark_node;
7766 The constant expressions that specify the bounds of the arrays
7767 can be omitted only for the first member of the sequence. */
7768 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7771 error ("declaration of %qD as multidimensional array must "
7772 "have bounds for all dimensions except the first",
7775 error ("multidimensional array must have bounds for all "
7776 "dimensions except the first");
7778 return error_mark_node;
7781 /* Figure out the index type for the array. */
7783 itype = compute_array_index_type (name, size, tf_warning_or_error);
7786 T is called the array element type; this type shall not be [...] an
7787 abstract class type. */
7788 abstract_virtuals_error (name, type);
7790 return build_cplus_array_type (type, itype);
7793 /* Check that it's OK to declare a function with the indicated TYPE.
7794 SFK indicates the kind of special function (if any) that this
7795 function is. OPTYPE is the type given in a conversion operator
7796 declaration, or the class type for a constructor/destructor.
7797 Returns the actual return type of the function; that
7798 may be different than TYPE if an error occurs, or for certain
7799 special functions. */
7802 check_special_function_return_type (special_function_kind sfk,
7808 case sfk_constructor:
7810 error ("return type specification for constructor invalid");
7812 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7813 type = build_pointer_type (optype);
7815 type = void_type_node;
7818 case sfk_destructor:
7820 error ("return type specification for destructor invalid");
7821 /* We can't use the proper return type here because we run into
7822 problems with ambiguous bases and covariant returns.
7823 Java classes are left unchanged because (void *) isn't a valid
7824 Java type, and we don't want to change the Java ABI. */
7825 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7826 type = build_pointer_type (void_type_node);
7828 type = void_type_node;
7831 case sfk_conversion:
7833 error ("return type specified for %<operator %T%>", optype);
7844 /* A variable or data member (whose unqualified name is IDENTIFIER)
7845 has been declared with the indicated TYPE. If the TYPE is not
7846 acceptable, issue an error message and return a type to use for
7847 error-recovery purposes. */
7850 check_var_type (tree identifier, tree type)
7852 if (VOID_TYPE_P (type))
7855 error ("unnamed variable or field declared void");
7856 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7858 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7859 error ("variable or field %qE declared void", identifier);
7862 error ("variable or field declared void");
7863 type = error_mark_node;
7869 /* Given declspecs and a declarator (abstract or otherwise), determine
7870 the name and type of the object declared and construct a DECL node
7873 DECLSPECS points to the representation of declaration-specifier
7874 sequence that precedes declarator.
7876 DECL_CONTEXT says which syntactic context this declaration is in:
7877 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7878 FUNCDEF for a function definition. Like NORMAL but a few different
7879 error messages in each case. Return value may be zero meaning
7880 this definition is too screwy to try to parse.
7881 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7882 handle member functions (which have FIELD context).
7883 Return value may be zero meaning this definition is too screwy to
7885 PARM for a parameter declaration (either within a function prototype
7886 or before a function body). Make a PARM_DECL, or return void_type_node.
7887 TPARM for a template parameter declaration.
7888 CATCHPARM for a parameter declaration before a catch clause.
7889 TYPENAME if for a typename (in a cast or sizeof).
7890 Don't make a DECL node; just return the ..._TYPE node.
7891 FIELD for a struct or union field; make a FIELD_DECL.
7892 BITFIELD for a field with specified width.
7894 INITIALIZED is as for start_decl.
7896 ATTRLIST is a pointer to the list of attributes, which may be NULL
7897 if there are none; *ATTRLIST may be modified if attributes from inside
7898 the declarator should be applied to the declaration.
7900 When this function is called, scoping variables (such as
7901 CURRENT_CLASS_TYPE) should reflect the scope in which the
7902 declaration occurs, not the scope in which the new declaration will
7903 be placed. For example, on:
7907 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7910 Returns a DECL (if a declarator is present), a TYPE (if there is no
7911 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7915 grokdeclarator (const cp_declarator *declarator,
7916 const cp_decl_specifier_seq *declspecs,
7917 enum decl_context decl_context,
7921 tree type = NULL_TREE;
7923 int explicit_int128 = 0;
7924 int virtualp, explicitp, friendp, inlinep, staticp;
7925 int explicit_int = 0;
7926 int explicit_char = 0;
7927 int defaulted_int = 0;
7928 tree dependent_name = NULL_TREE;
7930 tree typedef_decl = NULL_TREE;
7931 const char *name = NULL;
7932 tree typedef_type = NULL_TREE;
7933 /* True if this declarator is a function definition. */
7934 bool funcdef_flag = false;
7935 cp_declarator_kind innermost_code = cdk_error;
7938 /* See the code below that used this. */
7939 tree decl_attr = NULL_TREE;
7942 /* Keep track of what sort of function is being processed
7943 so that we can warn about default return values, or explicit
7944 return values which do not match prescribed defaults. */
7945 special_function_kind sfk = sfk_none;
7947 tree dname = NULL_TREE;
7948 tree ctor_return_type = NULL_TREE;
7949 enum overload_flags flags = NO_SPECIAL;
7950 /* cv-qualifiers that apply to the declarator, for a declaration of
7951 a member function. */
7952 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7953 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7955 tree raises = NULL_TREE;
7956 int template_count = 0;
7957 tree returned_attrs = NULL_TREE;
7958 tree parms = NULL_TREE;
7959 const cp_declarator *id_declarator;
7960 /* The unqualified name of the declarator; either an
7961 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7962 tree unqualified_id;
7963 /* The class type, if any, in which this entity is located,
7964 or NULL_TREE if none. Note that this value may be different from
7965 the current class type; for example if an attempt is made to declare
7966 "A::f" inside "B", this value will be "A". */
7967 tree ctype = current_class_type;
7968 /* The NAMESPACE_DECL for the namespace in which this entity is
7969 located. If an unqualified name is used to declare the entity,
7970 this value will be NULL_TREE, even if the entity is located at
7972 tree in_namespace = NULL_TREE;
7973 cp_storage_class storage_class;
7974 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7975 bool type_was_error_mark_node = false;
7976 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7977 bool template_type_arg = false;
7978 bool template_parm_flag = false;
7979 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7982 signed_p = declspecs->specs[(int)ds_signed];
7983 unsigned_p = declspecs->specs[(int)ds_unsigned];
7984 short_p = declspecs->specs[(int)ds_short];
7985 long_p = declspecs->specs[(int)ds_long];
7986 longlong = declspecs->specs[(int)ds_long] >= 2;
7987 explicit_int128 = declspecs->explicit_int128_p;
7988 thread_p = declspecs->specs[(int)ds_thread];
7990 if (decl_context == FUNCDEF)
7991 funcdef_flag = true, decl_context = NORMAL;
7992 else if (decl_context == MEMFUNCDEF)
7993 funcdef_flag = true, decl_context = FIELD;
7994 else if (decl_context == BITFIELD)
7995 bitfield = 1, decl_context = FIELD;
7996 else if (decl_context == TEMPLATE_TYPE_ARG)
7997 template_type_arg = true, decl_context = TYPENAME;
7998 else if (decl_context == TPARM)
7999 template_parm_flag = true, decl_context = PARM;
8001 if (initialized > 1)
8002 funcdef_flag = true;
8004 /* Look inside a declarator for the name being declared
8005 and get it as a string, for an error message. */
8006 for (id_declarator = declarator;
8008 id_declarator = id_declarator->declarator)
8010 if (id_declarator->kind != cdk_id)
8011 innermost_code = id_declarator->kind;
8013 switch (id_declarator->kind)
8016 if (id_declarator->declarator
8017 && id_declarator->declarator->kind == cdk_id)
8019 sfk = id_declarator->declarator->u.id.sfk;
8020 if (sfk == sfk_destructor)
8027 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8028 tree decl = id_declarator->u.id.unqualified_name;
8031 if (qualifying_scope)
8033 if (at_function_scope_p ())
8037 A declarator-id shall not be qualified except
8040 None of the cases are permitted in block
8042 if (qualifying_scope == global_namespace)
8043 error ("invalid use of qualified-name %<::%D%>",
8045 else if (TYPE_P (qualifying_scope))
8046 error ("invalid use of qualified-name %<%T::%D%>",
8047 qualifying_scope, decl);
8049 error ("invalid use of qualified-name %<%D::%D%>",
8050 qualifying_scope, decl);
8051 return error_mark_node;
8053 else if (TYPE_P (qualifying_scope))
8055 ctype = qualifying_scope;
8056 if (innermost_code != cdk_function
8057 && current_class_type
8058 && !UNIQUELY_DERIVED_FROM_P (ctype,
8059 current_class_type))
8061 error ("type %qT is not derived from type %qT",
8062 ctype, current_class_type);
8063 return error_mark_node;
8066 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8067 in_namespace = qualifying_scope;
8069 switch (TREE_CODE (decl))
8075 if (innermost_code != cdk_function)
8077 error ("declaration of %qD as non-function", decl);
8078 return error_mark_node;
8080 else if (!qualifying_scope
8081 && !(current_class_type && at_class_scope_p ()))
8083 error ("declaration of %qD as non-member", decl);
8084 return error_mark_node;
8087 type = TREE_OPERAND (decl, 0);
8089 type = constructor_name (type);
8090 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8095 case TEMPLATE_ID_EXPR:
8097 tree fns = TREE_OPERAND (decl, 0);
8100 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8102 gcc_assert (is_overloaded_fn (dname));
8103 dname = DECL_NAME (get_first_fn (dname));
8108 case IDENTIFIER_NODE:
8109 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8112 if (C_IS_RESERVED_WORD (dname))
8114 error ("declarator-id missing; using reserved word %qD",
8116 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8118 else if (!IDENTIFIER_TYPENAME_P (dname))
8119 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8122 gcc_assert (flags == NO_SPECIAL);
8123 flags = TYPENAME_FLAG;
8124 ctor_return_type = TREE_TYPE (dname);
8125 sfk = sfk_conversion;
8126 if (is_typename_at_global_scope (dname))
8127 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8129 name = "<invalid operator>";
8146 return error_mark_node;
8151 if (id_declarator->kind == cdk_id)
8157 The declarator in a function-definition shall have the form
8158 D1 ( parameter-declaration-clause) ... */
8159 if (funcdef_flag && innermost_code != cdk_function)
8161 error ("function definition does not declare parameters");
8162 return error_mark_node;
8165 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8166 && innermost_code != cdk_function
8167 && ! (ctype && !declspecs->any_specifiers_p))
8169 error ("declaration of %qD as non-function", dname);
8170 return error_mark_node;
8173 /* Anything declared one level down from the top level
8174 must be one of the parameters of a function
8175 (because the body is at least two levels down). */
8177 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8178 by not allowing C++ class definitions to specify their parameters
8179 with xdecls (must be spec.d in the parmlist).
8181 Since we now wait to push a class scope until we are sure that
8182 we are in a legitimate method context, we must set oldcname
8183 explicitly (since current_class_name is not yet alive).
8185 We also want to avoid calling this a PARM if it is in a namespace. */
8187 if (decl_context == NORMAL && !toplevel_bindings_p ())
8189 struct cp_binding_level *b = current_binding_level;
8190 current_binding_level = b->level_chain;
8191 if (current_binding_level != 0 && toplevel_bindings_p ())
8192 decl_context = PARM;
8193 current_binding_level = b;
8197 name = decl_context == PARM ? "parameter" : "type name";
8199 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8201 error ("%<constexpr%> cannot appear in a typedef declaration");
8202 return error_mark_node;
8205 /* If there were multiple types specified in the decl-specifier-seq,
8206 issue an error message. */
8207 if (declspecs->multiple_types_p)
8209 error ("two or more data types in declaration of %qs", name);
8210 return error_mark_node;
8213 if (declspecs->conflicting_specifiers_p)
8215 error ("conflicting specifiers in declaration of %qs", name);
8216 return error_mark_node;
8219 /* Extract the basic type from the decl-specifier-seq. */
8220 type = declspecs->type;
8221 if (type == error_mark_node)
8224 type_was_error_mark_node = true;
8226 /* If the entire declaration is itself tagged as deprecated then
8227 suppress reports of deprecated items. */
8228 if (type && TREE_DEPRECATED (type)
8229 && deprecated_state != DEPRECATED_SUPPRESS)
8230 warn_deprecated_use (type, NULL_TREE);
8231 if (type && TREE_CODE (type) == TYPE_DECL)
8233 typedef_decl = type;
8234 type = TREE_TYPE (typedef_decl);
8235 if (TREE_DEPRECATED (type)
8236 && DECL_ARTIFICIAL (typedef_decl)
8237 && deprecated_state != DEPRECATED_SUPPRESS)
8238 warn_deprecated_use (type, NULL_TREE);
8240 /* No type at all: default to `int', and set DEFAULTED_INT
8241 because it was not a user-defined typedef. */
8242 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8244 /* These imply 'int'. */
8245 type = integer_type_node;
8249 explicit_int = declspecs->explicit_int_p;
8250 explicit_char = declspecs->explicit_char_p;
8253 /* See the code below that used this. */
8255 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8257 typedef_type = type;
8260 if (sfk != sfk_conversion)
8261 ctor_return_type = ctype;
8263 if (sfk != sfk_none)
8264 type = check_special_function_return_type (sfk, type,
8266 else if (type == NULL_TREE)
8272 /* We handle `main' specially here, because 'main () { }' is so
8273 common. With no options, it is allowed. With -Wreturn-type,
8274 it is a warning. It is only an error with -pedantic-errors. */
8275 is_main = (funcdef_flag
8276 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8277 && MAIN_NAME_P (dname)
8278 && ctype == NULL_TREE
8279 && in_namespace == NULL_TREE
8280 && current_namespace == global_namespace);
8282 if (type_was_error_mark_node)
8283 /* We've already issued an error, don't complain more. */;
8284 else if (in_system_header || flag_ms_extensions)
8285 /* Allow it, sigh. */;
8287 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8289 pedwarn (input_location, OPT_pedantic,
8290 "ISO C++ forbids declaration of %qs with no type", name);
8292 warning (OPT_Wreturn_type,
8293 "ISO C++ forbids declaration of %qs with no type", name);
8295 type = integer_type_node;
8300 /* Now process the modifiers that were specified
8301 and check for invalid combinations. */
8303 /* Long double is a special combination. */
8304 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8307 type = cp_build_qualified_type (long_double_type_node,
8308 cp_type_quals (type));
8311 /* Check all other uses of type modifiers. */
8313 if (unsigned_p || signed_p || long_p || short_p)
8317 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8318 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8319 else if (signed_p && unsigned_p)
8320 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8321 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8322 error ("%<long long%> invalid for %qs", name);
8323 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8324 error ("%<__int128%> invalid for %qs", name);
8325 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8326 error ("%<long%> invalid for %qs", name);
8327 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8328 error ("%<short%> invalid for %qs", name);
8329 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8330 error ("%<long%> or %<short%> invalid for %qs", name);
8331 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8332 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8333 else if ((long_p || short_p) && explicit_char)
8334 error ("%<long%> or %<short%> specified with char for %qs", name);
8335 else if (long_p && short_p)
8336 error ("%<long%> and %<short%> specified together for %qs", name);
8337 else if (type == char16_type_node || type == char32_type_node)
8339 if (signed_p || unsigned_p)
8340 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8341 else if (short_p || long_p)
8342 error ("%<short%> or %<long%> invalid for %qs", name);
8347 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8349 pedwarn (input_location, OPT_pedantic,
8350 "long, short, signed or unsigned used invalidly for %qs",
8352 if (flag_pedantic_errors)
8355 if (explicit_int128)
8357 if (int128_integer_type_node == NULL_TREE)
8359 error ("%<__int128%> is not supported by this target");
8364 pedwarn (input_location, OPT_pedantic,
8365 "ISO C++ does not support %<__int128%> for %qs",
8367 if (flag_pedantic_errors)
8373 /* Discard the type modifiers if they are invalid. */
8381 explicit_int128 = false;
8385 /* Decide whether an integer type is signed or not.
8386 Optionally treat bitfields as signed by default. */
8390 It is implementation-defined whether a plain (neither
8391 explicitly signed or unsigned) char, short, int, or long
8392 bit-field is signed or unsigned.
8394 Naturally, we extend this to long long as well. Note that
8395 this does not include wchar_t. */
8396 || (bitfield && !flag_signed_bitfields
8398 /* A typedef for plain `int' without `signed' can be
8399 controlled just like plain `int', but a typedef for
8400 `signed int' cannot be so controlled. */
8402 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8403 && TREE_CODE (type) == INTEGER_TYPE
8404 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8406 if (explicit_int128)
8407 type = int128_unsigned_type_node;
8409 type = long_long_unsigned_type_node;
8411 type = long_unsigned_type_node;
8413 type = short_unsigned_type_node;
8414 else if (type == char_type_node)
8415 type = unsigned_char_type_node;
8416 else if (typedef_decl)
8417 type = unsigned_type_for (type);
8419 type = unsigned_type_node;
8421 else if (signed_p && type == char_type_node)
8422 type = signed_char_type_node;
8423 else if (explicit_int128)
8424 type = int128_integer_type_node;
8426 type = long_long_integer_type_node;
8428 type = long_integer_type_node;
8430 type = short_integer_type_node;
8432 if (declspecs->specs[(int)ds_complex])
8434 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8435 error ("complex invalid for %qs", name);
8436 /* If we just have "complex", it is equivalent to
8437 "complex double", but if any modifiers at all are specified it is
8438 the complex form of TYPE. E.g, "complex short" is
8439 "complex short int". */
8440 else if (defaulted_int && ! longlong && ! explicit_int128
8441 && ! (long_p || short_p || signed_p || unsigned_p))
8442 type = complex_double_type_node;
8443 else if (type == integer_type_node)
8444 type = complex_integer_type_node;
8445 else if (type == float_type_node)
8446 type = complex_float_type_node;
8447 else if (type == double_type_node)
8448 type = complex_double_type_node;
8449 else if (type == long_double_type_node)
8450 type = complex_long_double_type_node;
8452 type = build_complex_type (type);
8455 type_quals = TYPE_UNQUALIFIED;
8456 if (declspecs->specs[(int)ds_const])
8457 type_quals |= TYPE_QUAL_CONST;
8458 if (declspecs->specs[(int)ds_volatile])
8459 type_quals |= TYPE_QUAL_VOLATILE;
8460 if (declspecs->specs[(int)ds_restrict])
8461 type_quals |= TYPE_QUAL_RESTRICT;
8462 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8463 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8466 type_quals |= cp_type_quals (type);
8467 type = cp_build_qualified_type_real
8468 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8469 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8470 /* We might have ignored or rejected some of the qualifiers. */
8471 type_quals = cp_type_quals (type);
8474 inlinep = !! declspecs->specs[(int)ds_inline];
8475 virtualp = !! declspecs->specs[(int)ds_virtual];
8476 explicitp = !! declspecs->specs[(int)ds_explicit];
8478 storage_class = declspecs->storage_class;
8479 if (storage_class == sc_static)
8480 staticp = 1 + (decl_context == FIELD);
8482 if (virtualp && staticp == 2)
8484 error ("member %qD cannot be declared both virtual and static", dname);
8485 storage_class = sc_none;
8488 friendp = !! declspecs->specs[(int)ds_friend];
8490 if (dependent_name && !friendp)
8492 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8493 return error_mark_node;
8496 /* Issue errors about use of storage classes for parameters. */
8497 if (decl_context == PARM)
8499 if (declspecs->specs[(int)ds_typedef])
8501 error ("typedef declaration invalid in parameter declaration");
8502 return error_mark_node;
8504 else if (template_parm_flag && storage_class != sc_none)
8506 error ("storage class specified for template parameter %qs", name);
8507 return error_mark_node;
8509 else if (storage_class == sc_static
8510 || storage_class == sc_extern
8512 error ("storage class specifiers invalid in parameter declarations");
8514 if (type_uses_auto (type))
8516 error ("parameter declared %<auto%>");
8517 type = error_mark_node;
8520 /* Function parameters cannot be constexpr. If we saw one, moan
8521 and pretend it wasn't there. */
8524 error ("a parameter cannot be declared %<constexpr%>");
8529 /* Give error if `virtual' is used outside of class declaration. */
8531 && (current_class_name == NULL_TREE || decl_context != FIELD))
8533 error ("%<virtual%> outside class declaration");
8537 /* Static anonymous unions are dealt with here. */
8538 if (staticp && decl_context == TYPENAME
8540 && ANON_AGGR_TYPE_P (declspecs->type))
8541 decl_context = FIELD;
8543 /* Warn about storage classes that are invalid for certain
8544 kinds of declarations (parameters, typenames, etc.). */
8547 && storage_class != sc_extern
8548 && storage_class != sc_static)
8549 || declspecs->specs[(int)ds_typedef]))
8551 error ("multiple storage classes in declaration of %qs", name);
8554 if (decl_context != NORMAL
8555 && ((storage_class != sc_none
8556 && storage_class != sc_mutable)
8559 if ((decl_context == PARM || decl_context == CATCHPARM)
8560 && (storage_class == sc_register
8561 || storage_class == sc_auto))
8563 else if (declspecs->specs[(int)ds_typedef])
8565 else if (decl_context == FIELD
8566 /* C++ allows static class elements. */
8567 && storage_class == sc_static)
8568 /* C++ also allows inlines and signed and unsigned elements,
8569 but in those cases we don't come in here. */
8573 if (decl_context == FIELD)
8574 error ("storage class specified for %qs", name);
8577 if (decl_context == PARM || decl_context == CATCHPARM)
8578 error ("storage class specified for parameter %qs", name);
8580 error ("storage class specified for typename");
8582 if (storage_class == sc_register
8583 || storage_class == sc_auto
8584 || storage_class == sc_extern
8586 storage_class = sc_none;
8589 else if (storage_class == sc_extern && funcdef_flag
8590 && ! toplevel_bindings_p ())
8591 error ("nested function %qs declared %<extern%>", name);
8592 else if (toplevel_bindings_p ())
8594 if (storage_class == sc_auto)
8595 error ("top-level declaration of %qs specifies %<auto%>", name);
8598 && storage_class != sc_extern
8599 && storage_class != sc_static)
8601 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8606 if (storage_class && friendp)
8608 error ("storage class specifiers invalid in friend function declarations");
8609 storage_class = sc_none;
8614 unqualified_id = NULL_TREE;
8617 unqualified_id = id_declarator->u.id.unqualified_name;
8618 switch (TREE_CODE (unqualified_id))
8621 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8622 if (TYPE_P (unqualified_id))
8623 unqualified_id = constructor_name (unqualified_id);
8626 case IDENTIFIER_NODE:
8627 case TEMPLATE_ID_EXPR:
8635 /* Determine the type of the entity declared by recurring on the
8637 for (; declarator; declarator = declarator->declarator)
8639 const cp_declarator *inner_declarator;
8642 if (type == error_mark_node)
8643 return error_mark_node;
8645 attrs = declarator->attributes;
8651 if (declarator == NULL || declarator->kind == cdk_id)
8652 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8653 if (declarator->kind == cdk_function)
8654 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8655 if (declarator->kind == cdk_array)
8656 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8657 returned_attrs = decl_attributes (&type,
8658 chainon (returned_attrs, attrs),
8662 if (declarator->kind == cdk_id)
8665 inner_declarator = declarator->declarator;
8667 switch (declarator->kind)
8670 type = create_array_type_for_decl (dname, type,
8671 declarator->u.array.bounds);
8679 /* Declaring a function type.
8680 Make sure we have a valid type for the function to return. */
8682 if (type_quals != TYPE_UNQUALIFIED)
8684 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8685 warning (OPT_Wignored_qualifiers,
8686 "type qualifiers ignored on function return type");
8687 /* We now know that the TYPE_QUALS don't apply to the
8688 decl, but to its return type. */
8689 type_quals = TYPE_UNQUALIFIED;
8691 errmsg = targetm.invalid_return_type (type);
8695 type = integer_type_node;
8698 /* Error about some types functions can't return. */
8700 if (TREE_CODE (type) == FUNCTION_TYPE)
8702 error ("%qs declared as function returning a function", name);
8703 return error_mark_node;
8705 if (TREE_CODE (type) == ARRAY_TYPE)
8707 error ("%qs declared as function returning an array", name);
8708 return error_mark_node;
8711 /* Pick up type qualifiers which should be applied to `this'. */
8712 memfn_quals = declarator->u.function.qualifiers;
8714 /* Pick up the exception specifications. */
8715 raises = declarator->u.function.exception_specification;
8717 /* Say it's a definition only for the CALL_EXPR
8718 closest to the identifier. */
8719 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8721 /* Handle a late-specified return type. */
8724 if (type_uses_auto (type))
8726 if (!declarator->u.function.late_return_type)
8728 error ("%qs function uses %<auto%> type specifier without"
8729 " late return type", name);
8730 return error_mark_node;
8732 else if (!is_auto (type))
8734 error ("%qs function with late return type has"
8735 " %qT as its type rather than plain %<auto%>",
8737 return error_mark_node;
8740 else if (declarator->u.function.late_return_type)
8742 error ("%qs function with late return type not declared"
8743 " with %<auto%> type specifier", name);
8744 return error_mark_node;
8747 type = splice_late_return_type
8748 (type, declarator->u.function.late_return_type);
8749 if (type == error_mark_node)
8750 return error_mark_node;
8752 if (ctype == NULL_TREE
8753 && decl_context == FIELD
8755 && (friendp == 0 || dname == current_class_name))
8756 ctype = current_class_type;
8758 if (ctype && (sfk == sfk_constructor
8759 || sfk == sfk_destructor))
8761 /* We are within a class's scope. If our declarator name
8762 is the same as the class name, and we are defining
8763 a function, then it is a constructor/destructor, and
8764 therefore returns a void type. */
8766 /* ISO C++ 12.4/2. A destructor may not be declared
8767 const or volatile. A destructor may not be
8770 ISO C++ 12.1. A constructor may not be declared
8771 const or volatile. A constructor may not be
8772 virtual. A constructor may not be static. */
8774 error ((flags == DTOR_FLAG)
8775 ? "destructor cannot be static member function"
8776 : "constructor cannot be static member function");
8779 error ((flags == DTOR_FLAG)
8780 ? "destructors may not be cv-qualified"
8781 : "constructors may not be cv-qualified");
8782 memfn_quals = TYPE_UNQUALIFIED;
8785 if (decl_context == FIELD
8786 && !member_function_or_else (ctype,
8789 return error_mark_node;
8791 if (flags != DTOR_FLAG)
8793 /* It's a constructor. */
8798 permerror (input_location, "constructors cannot be declared virtual");
8801 if (decl_context == FIELD
8802 && sfk != sfk_constructor)
8803 return error_mark_node;
8805 if (decl_context == FIELD)
8811 error ("can%'t initialize friend function %qs", name);
8814 /* Cannot be both friend and virtual. */
8815 error ("virtual functions cannot be friends");
8818 if (decl_context == NORMAL)
8819 error ("friend declaration not in class definition");
8820 if (current_function_decl && funcdef_flag)
8821 error ("can%'t define friend function %qs in a local "
8825 else if (ctype && sfk == sfk_conversion)
8829 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8834 arg_types = grokparms (declarator->u.function.parameters,
8837 if (inner_declarator
8838 && inner_declarator->kind == cdk_id
8839 && inner_declarator->u.id.sfk == sfk_destructor
8840 && arg_types != void_list_node)
8842 error ("destructors may not have parameters");
8843 arg_types = void_list_node;
8847 type = build_function_type (type, arg_types);
8854 /* Filter out pointers-to-references and references-to-references.
8855 We can get these if a TYPE_DECL is used. */
8857 if (TREE_CODE (type) == REFERENCE_TYPE)
8859 if (declarator->kind != cdk_reference)
8861 error ("cannot declare pointer to %q#T", type);
8862 type = TREE_TYPE (type);
8865 /* In C++0x, we allow reference to reference declarations
8866 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8867 and template type arguments [14.3.1/4 temp.arg.type]. The
8868 check for direct reference to reference declarations, which
8869 are still forbidden, occurs below. Reasoning behind the change
8870 can be found in DR106, DR540, and the rvalue reference
8872 else if (cxx_dialect == cxx98)
8874 error ("cannot declare reference to %q#T", type);
8875 type = TREE_TYPE (type);
8878 else if (VOID_TYPE_P (type))
8880 if (declarator->kind == cdk_reference)
8881 error ("cannot declare reference to %q#T", type);
8882 else if (declarator->kind == cdk_ptrmem)
8883 error ("cannot declare pointer to %q#T member", type);
8886 /* We now know that the TYPE_QUALS don't apply to the decl,
8887 but to the target of the pointer. */
8888 type_quals = TYPE_UNQUALIFIED;
8890 if (declarator->kind == cdk_ptrmem
8891 && (TREE_CODE (type) == FUNCTION_TYPE
8892 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8894 memfn_quals |= type_memfn_quals (type);
8895 type = build_memfn_type (type,
8896 declarator->u.pointer.class_type,
8898 if (type == error_mark_node)
8899 return error_mark_node;
8900 memfn_quals = TYPE_UNQUALIFIED;
8903 if (TREE_CODE (type) == FUNCTION_TYPE
8904 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8905 error (declarator->kind == cdk_reference
8906 ? G_("cannot declare reference to qualified function type %qT")
8907 : G_("cannot declare pointer to qualified function type %qT"),
8910 /* When the pointed-to type involves components of variable size,
8911 care must be taken to ensure that the size evaluation code is
8912 emitted early enough to dominate all the possible later uses
8913 and late enough for the variables on which it depends to have
8916 This is expected to happen automatically when the pointed-to
8917 type has a name/declaration of it's own, but special attention
8918 is required if the type is anonymous.
8920 We handle the NORMAL and FIELD contexts here by inserting a
8921 dummy statement that just evaluates the size at a safe point
8922 and ensures it is not deferred until e.g. within a deeper
8923 conditional context (c++/43555).
8925 We expect nothing to be needed here for PARM or TYPENAME.
8926 Evaluating the size at this point for TYPENAME would
8927 actually be incorrect, as we might be in the middle of an
8928 expression with side effects on the pointed-to type size
8929 "arguments" prior to the pointer declaration point and the
8930 size evaluation could end up prior to the side effects. */
8932 if (!TYPE_NAME (type)
8933 && (decl_context == NORMAL || decl_context == FIELD)
8934 && at_function_scope_p ()
8935 && variably_modified_type_p (type, NULL_TREE))
8936 finish_expr_stmt (TYPE_SIZE (type));
8938 if (declarator->kind == cdk_reference)
8940 /* In C++0x, the type we are creating a reference to might be
8941 a typedef which is itself a reference type. In that case,
8942 we follow the reference collapsing rules in
8943 [7.1.3/8 dcl.typedef] to create the final reference type:
8945 "If a typedef TD names a type that is a reference to a type
8946 T, an attempt to create the type 'lvalue reference to cv TD'
8947 creates the type 'lvalue reference to T,' while an attempt
8948 to create the type "rvalue reference to cv TD' creates the
8951 if (!VOID_TYPE_P (type))
8952 type = cp_build_reference_type
8953 ((TREE_CODE (type) == REFERENCE_TYPE
8954 ? TREE_TYPE (type) : type),
8955 (declarator->u.reference.rvalue_ref
8956 && (TREE_CODE(type) != REFERENCE_TYPE
8957 || TYPE_REF_IS_RVALUE (type))));
8959 /* In C++0x, we need this check for direct reference to
8960 reference declarations, which are forbidden by
8961 [8.3.2/5 dcl.ref]. Reference to reference declarations
8962 are only allowed indirectly through typedefs and template
8963 type arguments. Example:
8965 void foo(int & &); // invalid ref-to-ref decl
8967 typedef int & int_ref;
8968 void foo(int_ref &); // valid ref-to-ref decl
8970 if (inner_declarator && inner_declarator->kind == cdk_reference)
8971 error ("cannot declare reference to %q#T, which is not "
8972 "a typedef or a template type argument", type);
8974 else if (TREE_CODE (type) == METHOD_TYPE)
8975 type = build_ptrmemfunc_type (build_pointer_type (type));
8976 else if (declarator->kind == cdk_ptrmem)
8978 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8980 if (declarator->u.pointer.class_type == error_mark_node)
8981 /* We will already have complained. */
8982 type = error_mark_node;
8984 type = build_ptrmem_type (declarator->u.pointer.class_type,
8988 type = build_pointer_type (type);
8990 /* Process a list of type modifier keywords (such as
8991 const or volatile) that were given inside the `*' or `&'. */
8993 if (declarator->u.pointer.qualifiers)
8996 = cp_build_qualified_type (type,
8997 declarator->u.pointer.qualifiers);
8998 type_quals = cp_type_quals (type);
9011 /* A `constexpr' specifier used in an object declaration declares
9012 the object as `const'. */
9013 if (constexpr_p && innermost_code != cdk_function)
9015 if (type_quals & TYPE_QUAL_CONST)
9016 error ("both %<const%> and %<constexpr%> cannot be used here");
9017 if (type_quals & TYPE_QUAL_VOLATILE)
9018 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9019 type_quals |= TYPE_QUAL_CONST;
9020 type = cp_build_qualified_type (type, type_quals);
9023 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9024 && TREE_CODE (type) != FUNCTION_TYPE
9025 && TREE_CODE (type) != METHOD_TYPE)
9027 error ("template-id %qD used as a declarator",
9029 unqualified_id = dname;
9032 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9033 qualified with a class-name, turn it into a METHOD_TYPE, unless
9034 we know that the function is static. We take advantage of this
9035 opportunity to do other processing that pertains to entities
9036 explicitly declared to be class members. Note that if DECLARATOR
9037 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9038 would not have exited the loop above. */
9040 && declarator->u.id.qualifying_scope
9041 && TYPE_P (declarator->u.id.qualifying_scope))
9045 ctype = declarator->u.id.qualifying_scope;
9046 ctype = TYPE_MAIN_VARIANT (ctype);
9048 while (t != NULL_TREE && CLASS_TYPE_P (t))
9050 /* You're supposed to have one `template <...>' for every
9051 template class, but you don't need one for a full
9052 specialization. For example:
9054 template <class T> struct S{};
9055 template <> struct S<int> { void f(); };
9056 void S<int>::f () {}
9058 is correct; there shouldn't be a `template <>' for the
9059 definition of `S<int>::f'. */
9060 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9061 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9062 /* T is an explicit (not partial) specialization. All
9063 containing classes must therefore also be explicitly
9066 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9067 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9068 template_count += 1;
9070 t = TYPE_MAIN_DECL (t);
9071 t = DECL_CONTEXT (t);
9074 if (ctype == current_class_type)
9078 permerror (input_location, "member functions are implicitly friends of their class");
9082 permerror (declarator->id_loc,
9083 "extra qualification %<%T::%> on member %qs",
9086 else if (/* If the qualifying type is already complete, then we
9087 can skip the following checks. */
9088 !COMPLETE_TYPE_P (ctype)
9089 && (/* If the function is being defined, then
9090 qualifying type must certainly be complete. */
9092 /* A friend declaration of "T::f" is OK, even if
9093 "T" is a template parameter. But, if this
9094 function is not a friend, the qualifying type
9096 || (!friendp && !CLASS_TYPE_P (ctype))
9097 /* For a declaration, the type need not be
9098 complete, if either it is dependent (since there
9099 is no meaningful definition of complete in that
9100 case) or the qualifying class is currently being
9102 || !(dependent_type_p (ctype)
9103 || currently_open_class (ctype)))
9104 /* Check that the qualifying type is complete. */
9105 && !complete_type_or_else (ctype, NULL_TREE))
9106 return error_mark_node;
9107 else if (TREE_CODE (type) == FUNCTION_TYPE)
9109 if (current_class_type
9110 && (!friendp || funcdef_flag))
9113 ? "cannot define member function %<%T::%s%> within %<%T%>"
9114 : "cannot declare member function %<%T::%s%> within %<%T%>",
9115 ctype, name, current_class_type);
9116 return error_mark_node;
9119 else if (declspecs->specs[(int)ds_typedef]
9120 && current_class_type)
9122 error ("cannot declare member %<%T::%s%> within %qT",
9123 ctype, name, current_class_type);
9124 return error_mark_node;
9128 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9129 ctype = current_class_type;
9131 /* A constexpr non-static member function is implicitly const. */
9132 if (constexpr_p && ctype && staticp == 0
9133 && TREE_CODE (type) == FUNCTION_TYPE
9134 && sfk != sfk_constructor && sfk != sfk_destructor)
9135 memfn_quals |= TYPE_QUAL_CONST;
9137 /* Now TYPE has the actual type. */
9142 *attrlist = chainon (returned_attrs, *attrlist);
9144 attrlist = &returned_attrs;
9147 /* Handle parameter packs. */
9148 if (parameter_pack_p)
9150 if (decl_context == PARM)
9151 /* Turn the type into a pack expansion.*/
9152 type = make_pack_expansion (type);
9154 error ("non-parameter %qs cannot be a parameter pack", name);
9157 /* Did array size calculations overflow? */
9159 if (TREE_CODE (type) == ARRAY_TYPE
9160 && COMPLETE_TYPE_P (type)
9161 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9162 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9164 error ("size of array %qs is too large", name);
9165 /* If we proceed with the array type as it is, we'll eventually
9166 crash in tree_low_cst(). */
9167 type = error_mark_node;
9170 if ((decl_context == FIELD || decl_context == PARM)
9171 && !processing_template_decl
9172 && variably_modified_type_p (type, NULL_TREE))
9174 if (decl_context == FIELD)
9175 error ("data member may not have variably modified type %qT", type);
9177 error ("parameter may not have variably modified type %qT", type);
9178 type = error_mark_node;
9181 if (explicitp == 1 || (explicitp && friendp))
9183 /* [dcl.fct.spec] The explicit specifier shall only be used in
9184 declarations of constructors within a class definition. */
9185 error ("only declarations of constructors can be %<explicit%>");
9189 if (storage_class == sc_mutable)
9191 if (decl_context != FIELD || friendp)
9193 error ("non-member %qs cannot be declared %<mutable%>", name);
9194 storage_class = sc_none;
9196 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9198 error ("non-object member %qs cannot be declared %<mutable%>", name);
9199 storage_class = sc_none;
9201 else if (TREE_CODE (type) == FUNCTION_TYPE
9202 || TREE_CODE (type) == METHOD_TYPE)
9204 error ("function %qs cannot be declared %<mutable%>", name);
9205 storage_class = sc_none;
9209 error ("static %qs cannot be declared %<mutable%>", name);
9210 storage_class = sc_none;
9212 else if (type_quals & TYPE_QUAL_CONST)
9214 error ("const %qs cannot be declared %<mutable%>", name);
9215 storage_class = sc_none;
9217 else if (TREE_CODE (type) == REFERENCE_TYPE)
9219 permerror (input_location, "reference %qs cannot be declared "
9220 "%<mutable%>", name);
9221 storage_class = sc_none;
9225 /* If this is declaring a typedef name, return a TYPE_DECL. */
9226 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9230 /* Note that the grammar rejects storage classes
9231 in typenames, fields or parameters. */
9232 if (current_lang_name == lang_name_java)
9233 TYPE_FOR_JAVA (type) = 1;
9235 /* This declaration:
9237 typedef void f(int) const;
9239 declares a function type which is not a member of any
9240 particular class, but which is cv-qualified; for
9241 example "f S::*" declares a pointer to a const-qualified
9242 member function of S. We record the cv-qualification in the
9244 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9246 type = apply_memfn_quals (type, memfn_quals);
9248 /* We have now dealt with these qualifiers. */
9249 memfn_quals = TYPE_UNQUALIFIED;
9252 if (decl_context == FIELD)
9253 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9255 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9256 if (id_declarator && declarator->u.id.qualifying_scope) {
9257 error_at (DECL_SOURCE_LOCATION (decl),
9258 "typedef name may not be a nested-name-specifier");
9259 TREE_TYPE (decl) = error_mark_node;
9262 if (decl_context != FIELD)
9264 if (!current_function_decl)
9265 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9266 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9267 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9268 (current_function_decl)))
9269 /* The TYPE_DECL is "abstract" because there will be
9270 clones of this constructor/destructor, and there will
9271 be copies of this TYPE_DECL generated in those
9273 DECL_ABSTRACT (decl) = 1;
9275 else if (constructor_name_p (unqualified_id, current_class_type))
9276 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9277 "as enclosing class",
9280 /* If the user declares "typedef struct {...} foo" then the
9281 struct will have an anonymous name. Fill that name in now.
9282 Nothing can refer to it, so nothing needs know about the name
9284 if (type != error_mark_node
9287 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9288 && TYPE_ANONYMOUS_P (type)
9289 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9293 /* Replace the anonymous name with the real name everywhere. */
9294 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9296 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9297 /* We do not rename the debug info representing the
9298 anonymous tagged type because the standard says in
9299 [dcl.typedef] that the naming applies only for
9300 linkage purposes. */
9301 /*debug_hooks->set_name (t, decl);*/
9302 TYPE_NAME (t) = decl;
9305 if (TYPE_LANG_SPECIFIC (type))
9306 TYPE_WAS_ANONYMOUS (type) = 1;
9308 /* If this is a typedef within a template class, the nested
9309 type is a (non-primary) template. The name for the
9310 template needs updating as well. */
9311 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9312 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9313 = TYPE_IDENTIFIER (type);
9315 /* Adjust linkage now that we aren't anonymous anymore. */
9316 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9317 determine_visibility (TYPE_MAIN_DECL (type));
9319 /* FIXME remangle member functions; member functions of a
9320 type with external linkage have external linkage. */
9324 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9325 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9327 bad_specifiers (decl, BSP_TYPE, virtualp,
9328 memfn_quals != TYPE_UNQUALIFIED,
9329 inlinep, friendp, raises != NULL_TREE);
9334 /* Detect the case of an array type of unspecified size
9335 which came, as such, direct from a typedef name.
9336 We must copy the type, so that the array's domain can be
9337 individually set by the object's initializer. */
9339 if (type && typedef_type
9340 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9341 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9342 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9344 /* Detect where we're using a typedef of function type to declare a
9345 function. PARMS will not be set, so we must create it now. */
9347 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9349 tree decls = NULL_TREE;
9352 for (args = TYPE_ARG_TYPES (type);
9353 args && args != void_list_node;
9354 args = TREE_CHAIN (args))
9356 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9358 DECL_CHAIN (decl) = decls;
9362 parms = nreverse (decls);
9364 if (decl_context != TYPENAME)
9366 /* A cv-qualifier-seq shall only be part of the function type
9367 for a non-static member function. [8.3.5/4 dcl.fct] */
9368 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9369 && (current_class_type == NULL_TREE || staticp) )
9372 ? G_("qualified function types cannot be used to "
9373 "declare static member functions")
9374 : G_("qualified function types cannot be used to "
9375 "declare free functions"));
9376 type = TYPE_MAIN_VARIANT (type);
9379 /* The qualifiers on the function type become the qualifiers on
9380 the non-static member function. */
9381 memfn_quals |= type_memfn_quals (type);
9382 type_quals = TYPE_UNQUALIFIED;
9386 /* If this is a type name (such as, in a cast or sizeof),
9387 compute the type and return it now. */
9389 if (decl_context == TYPENAME)
9391 /* Note that the grammar rejects storage classes
9392 in typenames, fields or parameters. */
9393 if (type_quals != TYPE_UNQUALIFIED)
9394 type_quals = TYPE_UNQUALIFIED;
9396 /* Special case: "friend class foo" looks like a TYPENAME context. */
9399 if (type_quals != TYPE_UNQUALIFIED)
9401 error ("type qualifiers specified for friend class declaration");
9402 type_quals = TYPE_UNQUALIFIED;
9406 error ("%<inline%> specified for friend class declaration");
9412 /* Don't allow friend declaration without a class-key. */
9413 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9414 permerror (input_location, "template parameters cannot be friends");
9415 else if (TREE_CODE (type) == TYPENAME_TYPE)
9416 permerror (input_location, "friend declaration requires class-key, "
9417 "i.e. %<friend class %T::%D%>",
9418 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9420 permerror (input_location, "friend declaration requires class-key, "
9421 "i.e. %<friend %#T%>",
9425 /* Only try to do this stuff if we didn't already give up. */
9426 if (type != integer_type_node)
9428 /* A friendly class? */
9429 if (current_class_type)
9430 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9433 error ("trying to make class %qT a friend of global scope",
9436 type = void_type_node;
9439 else if (memfn_quals)
9441 if (ctype == NULL_TREE
9442 && TREE_CODE (type) == METHOD_TYPE)
9443 ctype = TYPE_METHOD_BASETYPE (type);
9446 type = build_memfn_type (type, ctype, memfn_quals);
9447 /* Core issue #547: need to allow this in template type args. */
9448 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9449 type = apply_memfn_quals (type, memfn_quals);
9451 error ("invalid qualifiers on non-member function type");
9456 else if (unqualified_id == NULL_TREE && decl_context != PARM
9457 && decl_context != CATCHPARM
9458 && TREE_CODE (type) != UNION_TYPE
9461 error ("abstract declarator %qT used as declaration", type);
9462 return error_mark_node;
9465 /* Only functions may be declared using an operator-function-id. */
9467 && IDENTIFIER_OPNAME_P (unqualified_id)
9468 && TREE_CODE (type) != FUNCTION_TYPE
9469 && TREE_CODE (type) != METHOD_TYPE)
9471 error ("declaration of %qD as non-function", unqualified_id);
9472 return error_mark_node;
9475 /* We don't check parameter types here because we can emit a better
9476 error message later. */
9477 if (decl_context != PARM)
9479 type = check_var_type (unqualified_id, type);
9480 if (type == error_mark_node)
9481 return error_mark_node;
9484 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9485 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9487 if (decl_context == PARM || decl_context == CATCHPARM)
9489 if (ctype || in_namespace)
9490 error ("cannot use %<::%> in parameter declaration");
9492 /* A parameter declared as an array of T is really a pointer to T.
9493 One declared as a function is really a pointer to a function.
9494 One declared as a member is really a pointer to member. */
9496 if (TREE_CODE (type) == ARRAY_TYPE)
9498 /* Transfer const-ness of array into that of type pointed to. */
9499 type = build_pointer_type (TREE_TYPE (type));
9500 type_quals = TYPE_UNQUALIFIED;
9502 else if (TREE_CODE (type) == FUNCTION_TYPE)
9503 type = build_pointer_type (type);
9506 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9507 && !NEW_DELETE_OPNAME_P (unqualified_id))
9508 type = build_memfn_type (type, ctype, memfn_quals);
9513 if (decl_context == PARM)
9515 decl = cp_build_parm_decl (unqualified_id, type);
9517 bad_specifiers (decl, BSP_PARM, virtualp,
9518 memfn_quals != TYPE_UNQUALIFIED,
9519 inlinep, friendp, raises != NULL_TREE);
9521 else if (decl_context == FIELD)
9523 /* The C99 flexible array extension. */
9524 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9525 && TYPE_DOMAIN (type) == NULL_TREE)
9527 tree itype = compute_array_index_type (dname, integer_zero_node,
9528 tf_warning_or_error);
9529 type = build_cplus_array_type (TREE_TYPE (type), itype);
9532 if (type == error_mark_node)
9534 /* Happens when declaring arrays of sizes which
9535 are error_mark_node, for example. */
9538 else if (in_namespace && !friendp)
9540 /* Something like struct S { int N::j; }; */
9541 error ("invalid use of %<::%>");
9542 return error_mark_node;
9544 else if (TREE_CODE (type) == FUNCTION_TYPE
9545 || TREE_CODE (type) == METHOD_TYPE)
9548 tree function_context;
9552 /* This should never happen in pure C++ (the check
9553 could be an assert). It could happen in
9554 Objective-C++ if someone writes invalid code that
9555 uses a function declaration for an instance
9556 variable or property (instance variables and
9557 properties are parsed as FIELD_DECLs, but they are
9558 part of an Objective-C class, not a C++ class).
9559 That code is invalid and is caught by this
9563 error ("declaration of function %qD in invalid context",
9565 return error_mark_node;
9568 /* ``A union may [ ... ] not [ have ] virtual functions.''
9570 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9572 error ("function %qD declared virtual inside a union",
9574 return error_mark_node;
9577 if (NEW_DELETE_OPNAME_P (unqualified_id))
9581 error ("%qD cannot be declared virtual, since it "
9589 /* Check that the name used for a destructor makes sense. */
9590 if (sfk == sfk_destructor)
9592 tree uqname = id_declarator->u.id.unqualified_name;
9596 gcc_assert (friendp);
9597 error ("expected qualified name in friend declaration "
9598 "for destructor %qD", uqname);
9599 return error_mark_node;
9602 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9604 error ("declaration of %qD as member of %qT",
9606 return error_mark_node;
9610 error ("a destructor cannot be %<constexpr%>");
9611 return error_mark_node;
9614 else if (sfk == sfk_constructor && friendp && !ctype)
9616 error ("expected qualified name in friend declaration "
9617 "for constructor %qD",
9618 id_declarator->u.id.unqualified_name);
9619 return error_mark_node;
9622 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9623 function_context = (ctype != NULL_TREE) ?
9624 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9625 publicp = (! friendp || ! staticp)
9626 && function_context == NULL_TREE;
9627 decl = grokfndecl (ctype, type,
9628 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9629 ? unqualified_id : dname,
9632 virtualp, flags, memfn_quals, raises,
9633 friendp ? -1 : 0, friendp, publicp,
9634 inlinep | (2 * constexpr_p),
9636 funcdef_flag, template_count, in_namespace,
9637 attrlist, declarator->id_loc);
9638 if (decl == NULL_TREE)
9639 return error_mark_node;
9641 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9642 /* The decl and setting of decl_attr is also turned off. */
9643 decl = build_decl_attribute_variant (decl, decl_attr);
9646 /* [class.conv.ctor]
9648 A constructor declared without the function-specifier
9649 explicit that can be called with a single parameter
9650 specifies a conversion from the type of its first
9651 parameter to the type of its class. Such a constructor
9652 is called a converting constructor. */
9654 DECL_NONCONVERTING_P (decl) = 1;
9656 else if (!staticp && !dependent_type_p (type)
9657 && !COMPLETE_TYPE_P (complete_type (type))
9658 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9661 error ("field %qD has incomplete type", unqualified_id);
9663 error ("name %qT has incomplete type", type);
9665 /* If we're instantiating a template, tell them which
9666 instantiation made the field's type be incomplete. */
9667 if (current_class_type
9668 && TYPE_NAME (current_class_type)
9669 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9671 && declspecs->type == type)
9672 error (" in instantiation of template %qT",
9673 current_class_type);
9675 return error_mark_node;
9681 error ("%qE is neither function nor member function; "
9682 "cannot be declared friend", unqualified_id);
9690 /* Friends are treated specially. */
9691 if (ctype == current_class_type)
9692 ; /* We already issued a permerror. */
9693 else if (decl && DECL_NAME (decl))
9695 if (template_class_depth (current_class_type) == 0)
9697 decl = check_explicit_specialization
9698 (unqualified_id, decl, template_count,
9699 2 * funcdef_flag + 4);
9700 if (decl == error_mark_node)
9701 return error_mark_node;
9704 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9705 decl = do_friend (ctype, unqualified_id, decl,
9711 return error_mark_node;
9714 /* Structure field. It may not be a function, except for C++. */
9716 if (decl == NULL_TREE)
9722 /* An attempt is being made to initialize a non-static
9723 member. But, from [class.mem]:
9725 4 A member-declarator can contain a
9726 constant-initializer only if it declares a static
9727 member (_class.static_) of integral or enumeration
9728 type, see _class.static.data_.
9730 This used to be relatively common practice, but
9731 the rest of the compiler does not correctly
9732 handle the initialization unless the member is
9733 static so we make it static below. */
9734 if (cxx_dialect >= cxx0x)
9736 sorry ("non-static data member initializers");
9740 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9742 permerror (input_location, "making %qD static", unqualified_id);
9747 if (uses_template_parms (type))
9748 /* We'll check at instantiation time. */
9750 else if (constexpr_p)
9751 /* constexpr has the same requirements. */
9753 else if (check_static_variable_definition (unqualified_id,
9755 /* If we just return the declaration, crashes
9756 will sometimes occur. We therefore return
9757 void_type_node, as if this was a friend
9758 declaration, to cause callers to completely
9759 ignore this declaration. */
9760 return error_mark_node;
9765 /* C++ allows static class members. All other work
9766 for this is done by grokfield. */
9767 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9768 set_linkage_for_static_data_member (decl);
9769 /* Even if there is an in-class initialization, DECL
9770 is considered undefined until an out-of-class
9771 definition is provided. */
9772 DECL_EXTERNAL (decl) = 1;
9775 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9777 if (constexpr_p && !initialized)
9779 error ("constexpr static data member %qD must have an "
9780 "initializer", decl);
9781 constexpr_p = false;
9788 error ("non-static data member %qE declared %<constexpr%>",
9790 constexpr_p = false;
9792 decl = build_decl (input_location,
9793 FIELD_DECL, unqualified_id, type);
9794 DECL_NONADDRESSABLE_P (decl) = bitfield;
9795 if (bitfield && !unqualified_id)
9796 TREE_NO_WARNING (decl) = 1;
9798 if (storage_class == sc_mutable)
9800 DECL_MUTABLE_P (decl) = 1;
9801 storage_class = sc_none;
9805 bad_specifiers (decl, BSP_FIELD, virtualp,
9806 memfn_quals != TYPE_UNQUALIFIED,
9807 inlinep, friendp, raises != NULL_TREE);
9810 else if (TREE_CODE (type) == FUNCTION_TYPE
9811 || TREE_CODE (type) == METHOD_TYPE)
9816 if (!unqualified_id)
9817 return error_mark_node;
9819 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9820 original_name = dname;
9822 original_name = unqualified_id;
9824 if (storage_class == sc_auto)
9825 error ("storage class %<auto%> invalid for function %qs", name);
9826 else if (storage_class == sc_register)
9827 error ("storage class %<register%> invalid for function %qs", name);
9829 error ("storage class %<__thread%> invalid for function %qs", name);
9831 /* Function declaration not at top level.
9832 Storage classes other than `extern' are not allowed
9833 and `extern' makes no difference. */
9834 if (! toplevel_bindings_p ()
9835 && (storage_class == sc_static
9836 || declspecs->specs[(int)ds_inline])
9839 if (storage_class == sc_static)
9840 pedwarn (input_location, OPT_pedantic,
9841 "%<static%> specified invalid for function %qs "
9842 "declared out of global scope", name);
9844 pedwarn (input_location, OPT_pedantic,
9845 "%<inline%> specifier invalid for function %qs "
9846 "declared out of global scope", name);
9849 if (ctype != NULL_TREE
9850 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9852 error ("%q#T is not a class or a namespace", ctype);
9856 if (ctype == NULL_TREE)
9860 error ("virtual non-class function %qs", name);
9863 else if (sfk == sfk_constructor
9864 || sfk == sfk_destructor)
9867 ? "%qs defined in a non-class scope"
9868 : "%qs declared in a non-class scope", name);
9873 /* Record presence of `static'. */
9874 publicp = (ctype != NULL_TREE
9875 || storage_class == sc_extern
9876 || storage_class != sc_static);
9878 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9879 virtualp, flags, memfn_quals, raises,
9881 publicp, inlinep | (2 * constexpr_p), sfk,
9883 template_count, in_namespace, attrlist,
9884 declarator->id_loc);
9885 if (decl == NULL_TREE)
9886 return error_mark_node;
9890 int invalid_static = 0;
9892 /* Don't allow a static member function in a class, and forbid
9893 declaring main to be static. */
9894 if (TREE_CODE (type) == METHOD_TYPE)
9896 permerror (input_location, "cannot declare member function %qD to have "
9897 "static linkage", decl);
9900 else if (current_function_decl)
9902 /* FIXME need arm citation */
9903 error ("cannot declare static function inside another function");
9910 storage_class = sc_none;
9916 /* It's a variable. */
9918 /* An uninitialized decl with `extern' is a reference. */
9919 decl = grokvardecl (type, unqualified_id,
9922 (type_quals & TYPE_QUAL_CONST) != 0,
9923 ctype ? ctype : in_namespace);
9924 bad_specifiers (decl, BSP_VAR, virtualp,
9925 memfn_quals != TYPE_UNQUALIFIED,
9926 inlinep, friendp, raises != NULL_TREE);
9930 DECL_CONTEXT (decl) = ctype;
9933 permerror (input_location, "%<static%> may not be used when defining "
9934 "(as opposed to declaring) a static data member");
9936 storage_class = sc_none;
9938 if (storage_class == sc_register && TREE_STATIC (decl))
9940 error ("static member %qD declared %<register%>", decl);
9941 storage_class = sc_none;
9943 if (storage_class == sc_extern && pedantic)
9945 pedwarn (input_location, OPT_pedantic,
9946 "cannot explicitly declare member %q#D to have "
9947 "extern linkage", decl);
9948 storage_class = sc_none;
9951 else if (constexpr_p && DECL_EXTERNAL (decl))
9952 error ("declaration of constexpr variable %qD is not a definition",
9956 if (storage_class == sc_extern && initialized && !funcdef_flag)
9958 if (toplevel_bindings_p ())
9960 /* It's common practice (and completely valid) to have a const
9961 be initialized and declared extern. */
9962 if (!(type_quals & TYPE_QUAL_CONST))
9963 warning (0, "%qs initialized and declared %<extern%>", name);
9967 error ("%qs has both %<extern%> and initializer", name);
9968 return error_mark_node;
9972 /* Record `register' declaration for warnings on &
9973 and in case doing stupid register allocation. */
9975 if (storage_class == sc_register)
9976 DECL_REGISTER (decl) = 1;
9977 else if (storage_class == sc_extern)
9978 DECL_THIS_EXTERN (decl) = 1;
9979 else if (storage_class == sc_static)
9980 DECL_THIS_STATIC (decl) = 1;
9982 /* Don't forget constexprness. */
9984 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9986 /* Record constancy and volatility on the DECL itself . There's
9987 no need to do this when processing a template; we'll do this
9988 for the instantiated declaration based on the type of DECL. */
9989 if (!processing_template_decl)
9990 cp_apply_type_quals_to_decl (type_quals, decl);
9996 /* Subroutine of start_function. Ensure that each of the parameter
9997 types (as listed in PARMS) is complete, as is required for a
9998 function definition. */
10001 require_complete_types_for_parms (tree parms)
10003 for (; parms; parms = DECL_CHAIN (parms))
10005 if (dependent_type_p (TREE_TYPE (parms)))
10007 if (!VOID_TYPE_P (TREE_TYPE (parms))
10008 && complete_type_or_else (TREE_TYPE (parms), parms))
10010 relayout_decl (parms);
10011 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10014 /* grokparms or complete_type_or_else will have already issued
10016 TREE_TYPE (parms) = error_mark_node;
10020 /* Returns nonzero if T is a local variable. */
10023 local_variable_p (const_tree t)
10025 if ((TREE_CODE (t) == VAR_DECL
10026 /* A VAR_DECL with a context that is a _TYPE is a static data
10028 && !TYPE_P (CP_DECL_CONTEXT (t))
10029 /* Any other non-local variable must be at namespace scope. */
10030 && !DECL_NAMESPACE_SCOPE_P (t))
10031 || (TREE_CODE (t) == PARM_DECL))
10037 /* Like local_variable_p, but suitable for use as a tree-walking
10041 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10042 void *data ATTRIBUTE_UNUSED)
10044 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10046 else if (TYPE_P (*tp))
10047 *walk_subtrees = 0;
10053 /* Check that ARG, which is a default-argument expression for a
10054 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10055 something goes wrong. DECL may also be a _TYPE node, rather than a
10056 DECL, if there is no DECL available. */
10059 check_default_argument (tree decl, tree arg)
10064 if (TREE_CODE (arg) == DEFAULT_ARG)
10065 /* We get a DEFAULT_ARG when looking at an in-class declaration
10066 with a default argument. Ignore the argument for now; we'll
10067 deal with it after the class is complete. */
10076 decl_type = TREE_TYPE (decl);
10078 if (arg == error_mark_node
10079 || decl == error_mark_node
10080 || TREE_TYPE (arg) == error_mark_node
10081 || decl_type == error_mark_node)
10082 /* Something already went wrong. There's no need to check
10084 return error_mark_node;
10086 /* [dcl.fct.default]
10088 A default argument expression is implicitly converted to the
10090 if (!TREE_TYPE (arg)
10091 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10094 error ("default argument for %q#D has type %qT",
10095 decl, TREE_TYPE (arg));
10097 error ("default argument for parameter of type %qT has type %qT",
10098 decl_type, TREE_TYPE (arg));
10100 return error_mark_node;
10103 /* [dcl.fct.default]
10105 Local variables shall not be used in default argument
10108 The keyword `this' shall not be used in a default argument of a
10109 member function. */
10110 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10113 error ("default argument %qE uses local variable %qD", arg, var);
10114 return error_mark_node;
10121 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10124 type_is_deprecated (tree type)
10126 enum tree_code code;
10127 if (TREE_DEPRECATED (type))
10129 if (TYPE_NAME (type)
10130 && TREE_DEPRECATED (TYPE_NAME (type)))
10133 /* Do warn about using typedefs to a deprecated class. */
10134 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10135 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10137 code = TREE_CODE (type);
10139 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10140 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10141 || code == METHOD_TYPE || code == ARRAY_TYPE)
10142 return type_is_deprecated (TREE_TYPE (type));
10144 if (TYPE_PTRMEMFUNC_P (type))
10145 return type_is_deprecated
10146 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10151 /* Decode the list of parameter types for a function type.
10152 Given the list of things declared inside the parens,
10153 return a list of types.
10155 If this parameter does not end with an ellipsis, we append
10158 *PARMS is set to the chain of PARM_DECLs created. */
10161 grokparms (tree parmlist, tree *parms)
10163 tree result = NULL_TREE;
10164 tree decls = NULL_TREE;
10168 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10170 tree type = NULL_TREE;
10171 tree init = TREE_PURPOSE (parm);
10172 tree decl = TREE_VALUE (parm);
10173 const char *errmsg;
10175 if (parm == void_list_node)
10178 if (! decl || TREE_TYPE (decl) == error_mark_node)
10181 type = TREE_TYPE (decl);
10182 if (VOID_TYPE_P (type))
10184 if (same_type_p (type, void_type_node)
10185 && DECL_SELF_REFERENCE_P (type)
10186 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10187 /* this is a parmlist of `(void)', which is ok. */
10189 cxx_incomplete_type_error (decl, type);
10190 /* It's not a good idea to actually create parameters of
10191 type `void'; other parts of the compiler assume that a
10192 void type terminates the parameter list. */
10193 type = error_mark_node;
10194 TREE_TYPE (decl) = error_mark_node;
10197 if (type != error_mark_node
10198 && TYPE_FOR_JAVA (type)
10199 && MAYBE_CLASS_TYPE_P (type))
10201 error ("parameter %qD has Java class type", decl);
10202 type = error_mark_node;
10203 TREE_TYPE (decl) = error_mark_node;
10207 if (type != error_mark_node
10208 && (errmsg = targetm.invalid_parameter_type (type)))
10211 type = error_mark_node;
10212 TREE_TYPE (decl) = error_mark_node;
10215 if (type != error_mark_node)
10217 if (deprecated_state != DEPRECATED_SUPPRESS)
10219 tree deptype = type_is_deprecated (type);
10221 warn_deprecated_use (deptype, NULL_TREE);
10224 /* Top-level qualifiers on the parameters are
10225 ignored for function types. */
10226 type = cp_build_qualified_type (type, 0);
10227 if (TREE_CODE (type) == METHOD_TYPE)
10229 error ("parameter %qD invalidly declared method type", decl);
10230 type = build_pointer_type (type);
10231 TREE_TYPE (decl) = type;
10233 else if (abstract_virtuals_error (decl, type))
10234 any_error = 1; /* Seems like a good idea. */
10235 else if (POINTER_TYPE_P (type))
10237 /* [dcl.fct]/6, parameter types cannot contain pointers
10238 (references) to arrays of unknown bound. */
10239 tree t = TREE_TYPE (type);
10240 int ptr = TYPE_PTR_P (type);
10244 if (TYPE_PTR_P (t))
10246 else if (TREE_CODE (t) != ARRAY_TYPE)
10248 else if (!TYPE_DOMAIN (t))
10252 if (TREE_CODE (t) == ARRAY_TYPE)
10254 ? G_("parameter %qD includes pointer to array of "
10255 "unknown bound %qT")
10256 : G_("parameter %qD includes reference to array of "
10257 "unknown bound %qT"),
10263 else if (init && !processing_template_decl)
10264 init = check_default_argument (decl, init);
10267 if (TREE_CODE (decl) == PARM_DECL
10268 && FUNCTION_PARAMETER_PACK_P (decl)
10269 && TREE_CHAIN (parm)
10270 && TREE_CHAIN (parm) != void_list_node)
10271 error ("parameter packs must be at the end of the parameter list");
10273 DECL_CHAIN (decl) = decls;
10275 result = tree_cons (init, type, result);
10277 decls = nreverse (decls);
10278 result = nreverse (result);
10280 result = chainon (result, void_list_node);
10287 /* D is a constructor or overloaded `operator='.
10289 Let T be the class in which D is declared. Then, this function
10292 -1 if D's is an ill-formed constructor or copy assignment operator
10293 whose first parameter is of type `T'.
10294 0 if D is not a copy constructor or copy assignment
10296 1 if D is a copy constructor or copy assignment operator whose
10297 first parameter is a reference to non-const qualified T.
10298 2 if D is a copy constructor or copy assignment operator whose
10299 first parameter is a reference to const qualified T.
10301 This function can be used as a predicate. Positive values indicate
10302 a copy constructor and nonzero values indicate a copy assignment
10306 copy_fn_p (const_tree d)
10312 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10314 if (TREE_CODE (d) == TEMPLATE_DECL
10315 || (DECL_TEMPLATE_INFO (d)
10316 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10317 /* Instantiations of template member functions are never copy
10318 functions. Note that member functions of templated classes are
10319 represented as template functions internally, and we must
10320 accept those as copy functions. */
10323 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10327 arg_type = TREE_VALUE (args);
10328 if (arg_type == error_mark_node)
10331 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10333 /* Pass by value copy assignment operator. */
10336 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10337 && !TYPE_REF_IS_RVALUE (arg_type)
10338 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10340 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10346 args = TREE_CHAIN (args);
10348 if (args && args != void_list_node && !TREE_PURPOSE (args))
10349 /* There are more non-optional args. */
10355 /* D is a constructor or overloaded `operator='.
10357 Let T be the class in which D is declared. Then, this function
10358 returns true when D is a move constructor or move assignment
10359 operator, false otherwise. */
10362 move_fn_p (const_tree d)
10366 bool result = false;
10368 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10370 if (cxx_dialect == cxx98)
10371 /* There are no move constructors if we are in C++98 mode. */
10374 if (TREE_CODE (d) == TEMPLATE_DECL
10375 || (DECL_TEMPLATE_INFO (d)
10376 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10377 /* Instantiations of template member functions are never copy
10378 functions. Note that member functions of templated classes are
10379 represented as template functions internally, and we must
10380 accept those as copy functions. */
10383 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10387 arg_type = TREE_VALUE (args);
10388 if (arg_type == error_mark_node)
10391 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10392 && TYPE_REF_IS_RVALUE (arg_type)
10393 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10397 args = TREE_CHAIN (args);
10399 if (args && args != void_list_node && !TREE_PURPOSE (args))
10400 /* There are more non-optional args. */
10406 /* Remember any special properties of member function DECL. */
10409 grok_special_member_properties (tree decl)
10413 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10416 class_type = DECL_CONTEXT (decl);
10417 if (DECL_CONSTRUCTOR_P (decl))
10419 int ctor = copy_fn_p (decl);
10421 if (!DECL_ARTIFICIAL (decl))
10422 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10428 A non-template constructor for class X is a copy
10429 constructor if its first parameter is of type X&, const
10430 X&, volatile X& or const volatile X&, and either there
10431 are no other parameters or else all other parameters have
10432 default arguments. */
10433 TYPE_HAS_COPY_CTOR (class_type) = 1;
10434 if (user_provided_p (decl))
10435 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10437 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10439 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10441 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10442 if (user_provided_p (decl))
10443 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10445 else if (move_fn_p (decl) && user_provided_p (decl))
10446 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10447 else if (is_list_ctor (decl))
10448 TYPE_HAS_LIST_CTOR (class_type) = 1;
10450 if (DECL_DECLARED_CONSTEXPR_P (decl)
10451 && !copy_fn_p (decl) && !move_fn_p (decl))
10452 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10454 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10458 A non-template assignment operator for class X is a copy
10459 assignment operator if its parameter is of type X, X&, const
10460 X&, volatile X& or const volatile X&. */
10462 int assop = copy_fn_p (decl);
10466 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10467 if (user_provided_p (decl))
10468 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10470 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10472 else if (move_fn_p (decl) && user_provided_p (decl))
10473 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10475 /* Destructors are handled in check_methods. */
10478 /* Check a constructor DECL has the correct form. Complains
10479 if the class has a constructor of the form X(X). */
10482 grok_ctor_properties (const_tree ctype, const_tree decl)
10484 int ctor_parm = copy_fn_p (decl);
10490 A declaration of a constructor for a class X is ill-formed if
10491 its first parameter is of type (optionally cv-qualified) X
10492 and either there are no other parameters or else all other
10493 parameters have default arguments.
10495 We *don't* complain about member template instantiations that
10496 have this form, though; they can occur as we try to decide
10497 what constructor to use during overload resolution. Since
10498 overload resolution will never prefer such a constructor to
10499 the non-template copy constructor (which is either explicitly
10500 or implicitly defined), there's no need to worry about their
10501 existence. Theoretically, they should never even be
10502 instantiated, but that's hard to forestall. */
10503 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10511 /* An operator with this code is unary, but can also be binary. */
10514 ambi_op_p (enum tree_code code)
10516 return (code == INDIRECT_REF
10517 || code == ADDR_EXPR
10518 || code == UNARY_PLUS_EXPR
10519 || code == NEGATE_EXPR
10520 || code == PREINCREMENT_EXPR
10521 || code == PREDECREMENT_EXPR);
10524 /* An operator with this name can only be unary. */
10527 unary_op_p (enum tree_code code)
10529 return (code == TRUTH_NOT_EXPR
10530 || code == BIT_NOT_EXPR
10531 || code == COMPONENT_REF
10532 || code == TYPE_EXPR);
10535 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10536 errors are issued for invalid declarations. */
10539 grok_op_properties (tree decl, bool complain)
10541 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10543 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10544 tree name = DECL_NAME (decl);
10545 enum tree_code operator_code;
10550 /* Count the number of arguments and check for ellipsis. */
10551 for (argtype = argtypes, arity = 0;
10552 argtype && argtype != void_list_node;
10553 argtype = TREE_CHAIN (argtype))
10555 ellipsis_p = !argtype;
10557 class_type = DECL_CONTEXT (decl);
10558 if (class_type && !CLASS_TYPE_P (class_type))
10559 class_type = NULL_TREE;
10561 if (DECL_CONV_FN_P (decl))
10562 operator_code = TYPE_EXPR;
10566 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10567 if (ansi_opname (CODE) == name) \
10569 operator_code = (CODE); \
10572 else if (ansi_assopname (CODE) == name) \
10574 operator_code = (CODE); \
10575 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10579 #include "operators.def"
10580 #undef DEF_OPERATOR
10582 gcc_unreachable ();
10585 gcc_assert (operator_code != MAX_TREE_CODES);
10586 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10589 switch (operator_code)
10592 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10596 TYPE_GETS_DELETE (class_type) |= 1;
10600 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10603 case VEC_DELETE_EXPR:
10604 TYPE_GETS_DELETE (class_type) |= 2;
10611 /* [basic.std.dynamic.allocation]/1:
10613 A program is ill-formed if an allocation function is declared
10614 in a namespace scope other than global scope or declared static
10617 The same also holds true for deallocation functions. */
10618 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10619 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10621 if (DECL_NAMESPACE_SCOPE_P (decl))
10623 if (CP_DECL_CONTEXT (decl) != global_namespace)
10625 error ("%qD may not be declared within a namespace", decl);
10628 else if (!TREE_PUBLIC (decl))
10630 error ("%qD may not be declared as static", decl);
10636 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10638 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10639 DECL_IS_OPERATOR_NEW (decl) = 1;
10641 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10642 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10645 /* An operator function must either be a non-static member function
10646 or have at least one parameter of a class, a reference to a class,
10647 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10648 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10650 if (operator_code == TYPE_EXPR
10651 || operator_code == CALL_EXPR
10652 || operator_code == COMPONENT_REF
10653 || operator_code == ARRAY_REF
10654 || operator_code == NOP_EXPR)
10656 error ("%qD must be a nonstatic member function", decl);
10663 if (DECL_STATIC_FUNCTION_P (decl))
10665 error ("%qD must be either a non-static member "
10666 "function or a non-member function", decl);
10670 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10672 tree arg = non_reference (TREE_VALUE (p));
10673 if (arg == error_mark_node)
10676 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10677 because these checks are performed even on
10678 template functions. */
10679 if (MAYBE_CLASS_TYPE_P (arg)
10680 || TREE_CODE (arg) == ENUMERAL_TYPE)
10684 if (!p || p == void_list_node)
10687 error ("%qD must have an argument of class or "
10688 "enumerated type", decl);
10694 /* There are no restrictions on the arguments to an overloaded
10696 if (operator_code == CALL_EXPR)
10699 /* Warn about conversion operators that will never be used. */
10700 if (IDENTIFIER_TYPENAME_P (name)
10701 && ! DECL_TEMPLATE_INFO (decl)
10703 /* Warn only declaring the function; there is no need to
10704 warn again about out-of-class definitions. */
10705 && class_type == current_class_type)
10707 tree t = TREE_TYPE (name);
10708 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10711 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10713 if (TREE_CODE (t) == VOID_TYPE)
10714 warning (OPT_Wconversion,
10716 ? G_("conversion to a reference to void "
10717 "will never use a type conversion operator")
10718 : G_("conversion to void "
10719 "will never use a type conversion operator"));
10720 else if (class_type)
10722 if (t == class_type)
10723 warning (OPT_Wconversion,
10725 ? G_("conversion to a reference to the same type "
10726 "will never use a type conversion operator")
10727 : G_("conversion to the same type "
10728 "will never use a type conversion operator"));
10729 /* Don't force t to be complete here. */
10730 else if (MAYBE_CLASS_TYPE_P (t)
10731 && COMPLETE_TYPE_P (t)
10732 && DERIVED_FROM_P (t, class_type))
10733 warning (OPT_Wconversion,
10735 ? G_("conversion to a reference to a base class "
10736 "will never use a type conversion operator")
10737 : G_("conversion to a base class "
10738 "will never use a type conversion operator"));
10743 if (operator_code == COND_EXPR)
10746 error ("ISO C++ prohibits overloading operator ?:");
10749 else if (ellipsis_p)
10751 error ("%qD must not have variable number of arguments", decl);
10754 else if (ambi_op_p (operator_code))
10757 /* We pick the one-argument operator codes by default, so
10758 we don't have to change anything. */
10760 else if (arity == 2)
10762 /* If we thought this was a unary operator, we now know
10763 it to be a binary operator. */
10764 switch (operator_code)
10767 operator_code = MULT_EXPR;
10771 operator_code = BIT_AND_EXPR;
10774 case UNARY_PLUS_EXPR:
10775 operator_code = PLUS_EXPR;
10779 operator_code = MINUS_EXPR;
10782 case PREINCREMENT_EXPR:
10783 operator_code = POSTINCREMENT_EXPR;
10786 case PREDECREMENT_EXPR:
10787 operator_code = POSTDECREMENT_EXPR;
10791 gcc_unreachable ();
10794 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10796 if ((operator_code == POSTINCREMENT_EXPR
10797 || operator_code == POSTDECREMENT_EXPR)
10798 && ! processing_template_decl
10799 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10802 error ("postfix %qD must take %<int%> as its argument",
10805 error ("postfix %qD must take %<int%> as its second "
10813 error ("%qD must take either zero or one argument", decl);
10815 error ("%qD must take either one or two arguments", decl);
10819 /* More Effective C++ rule 6. */
10821 && (operator_code == POSTINCREMENT_EXPR
10822 || operator_code == POSTDECREMENT_EXPR
10823 || operator_code == PREINCREMENT_EXPR
10824 || operator_code == PREDECREMENT_EXPR))
10826 tree arg = TREE_VALUE (argtypes);
10827 tree ret = TREE_TYPE (TREE_TYPE (decl));
10828 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10829 arg = TREE_TYPE (arg);
10830 arg = TYPE_MAIN_VARIANT (arg);
10831 if (operator_code == PREINCREMENT_EXPR
10832 || operator_code == PREDECREMENT_EXPR)
10834 if (TREE_CODE (ret) != REFERENCE_TYPE
10835 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10837 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10838 build_reference_type (arg));
10842 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10843 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10847 else if (unary_op_p (operator_code))
10852 error ("%qD must take %<void%>", decl);
10854 error ("%qD must take exactly one argument", decl);
10858 else /* if (binary_op_p (operator_code)) */
10863 error ("%qD must take exactly one argument", decl);
10865 error ("%qD must take exactly two arguments", decl);
10869 /* More Effective C++ rule 7. */
10871 && (operator_code == TRUTH_ANDIF_EXPR
10872 || operator_code == TRUTH_ORIF_EXPR
10873 || operator_code == COMPOUND_EXPR))
10874 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10878 /* Effective C++ rule 23. */
10881 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10882 && (operator_code == PLUS_EXPR
10883 || operator_code == MINUS_EXPR
10884 || operator_code == TRUNC_DIV_EXPR
10885 || operator_code == MULT_EXPR
10886 || operator_code == TRUNC_MOD_EXPR)
10887 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10888 warning (OPT_Weffc__, "%qD should return by value", decl);
10890 /* [over.oper]/8 */
10891 for (; argtypes && argtypes != void_list_node;
10892 argtypes = TREE_CHAIN (argtypes))
10893 if (TREE_PURPOSE (argtypes))
10895 TREE_PURPOSE (argtypes) = NULL_TREE;
10896 if (operator_code == POSTINCREMENT_EXPR
10897 || operator_code == POSTDECREMENT_EXPR)
10899 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10904 error ("%qD cannot have default arguments", decl);
10912 /* Return a string giving the keyword associate with CODE. */
10914 static const char *
10915 tag_name (enum tag_types code)
10927 case typename_type:
10930 gcc_unreachable ();
10934 /* Name lookup in an elaborated-type-specifier (after the keyword
10935 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10936 elaborated-type-specifier is invalid, issue a diagnostic and return
10937 error_mark_node; otherwise, return the *_TYPE to which it referred.
10938 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10941 check_elaborated_type_specifier (enum tag_types tag_code,
10943 bool allow_template_p)
10949 struct S { struct S *p; };
10951 name lookup will find the TYPE_DECL for the implicit "S::S"
10952 typedef. Adjust for that here. */
10953 if (DECL_SELF_REFERENCE_P (decl))
10954 decl = TYPE_NAME (TREE_TYPE (decl));
10956 type = TREE_TYPE (decl);
10958 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10959 is false for this case as well. */
10960 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10962 error ("using template type parameter %qT after %qs",
10963 type, tag_name (tag_code));
10964 return error_mark_node;
10968 If the identifier resolves to a typedef-name or a template
10969 type-parameter, the elaborated-type-specifier is ill-formed.
10971 In other words, the only legitimate declaration to use in the
10972 elaborated type specifier is the implicit typedef created when
10973 the type is declared. */
10974 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10975 && !DECL_SELF_REFERENCE_P (decl)
10976 && tag_code != typename_type)
10978 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10979 error ("%q+D has a previous declaration here", decl);
10980 return error_mark_node;
10982 else if (TREE_CODE (type) != RECORD_TYPE
10983 && TREE_CODE (type) != UNION_TYPE
10984 && tag_code != enum_type
10985 && tag_code != typename_type)
10987 error ("%qT referred to as %qs", type, tag_name (tag_code));
10988 error ("%q+T has a previous declaration here", type);
10989 return error_mark_node;
10991 else if (TREE_CODE (type) != ENUMERAL_TYPE
10992 && tag_code == enum_type)
10994 error ("%qT referred to as enum", type);
10995 error ("%q+T has a previous declaration here", type);
10996 return error_mark_node;
10998 else if (!allow_template_p
10999 && TREE_CODE (type) == RECORD_TYPE
11000 && CLASSTYPE_IS_TEMPLATE (type))
11002 /* If a class template appears as elaborated type specifier
11003 without a template header such as:
11005 template <class T> class C {};
11006 void f(class C); // No template header here
11008 then the required template argument is missing. */
11009 error ("template argument required for %<%s %T%>",
11010 tag_name (tag_code),
11011 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11012 return error_mark_node;
11018 /* Lookup NAME in elaborate type specifier in scope according to
11019 SCOPE and issue diagnostics if necessary.
11020 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11021 found, and ERROR_MARK_NODE for type error. */
11024 lookup_and_check_tag (enum tag_types tag_code, tree name,
11025 tag_scope scope, bool template_header_p)
11029 if (scope == ts_global)
11031 /* First try ordinary name lookup, ignoring hidden class name
11032 injected via friend declaration. */
11033 decl = lookup_name_prefer_type (name, 2);
11034 /* If that fails, the name will be placed in the smallest
11035 non-class, non-function-prototype scope according to 3.3.1/5.
11036 We may already have a hidden name declared as friend in this
11037 scope. So lookup again but not ignoring hidden names.
11038 If we find one, that name will be made visible rather than
11039 creating a new tag. */
11041 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11044 decl = lookup_type_scope (name, scope);
11046 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11047 decl = DECL_TEMPLATE_RESULT (decl);
11049 if (decl && TREE_CODE (decl) == TYPE_DECL)
11051 /* Look for invalid nested type:
11055 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11057 error ("%qD has the same name as the class in which it is "
11060 return error_mark_node;
11063 /* Two cases we need to consider when deciding if a class
11064 template is allowed as an elaborated type specifier:
11065 1. It is a self reference to its own class.
11066 2. It comes with a template header.
11070 template <class T> class C {
11071 class C *c1; // DECL_SELF_REFERENCE_P is true
11074 template <class U> class C; // template_header_p is true
11075 template <class T> class C<T>::D {
11076 class C *c2; // DECL_SELF_REFERENCE_P is true
11079 t = check_elaborated_type_specifier (tag_code,
11082 | DECL_SELF_REFERENCE_P (decl));
11085 else if (decl && TREE_CODE (decl) == TREE_LIST)
11087 error ("reference to %qD is ambiguous", name);
11088 print_candidates (decl);
11089 return error_mark_node;
11095 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11096 Define the tag as a forward-reference if it is not defined.
11098 If a declaration is given, process it here, and report an error if
11099 multiple declarations are not identical.
11101 SCOPE is TS_CURRENT when this is also a definition. Only look in
11102 the current frame for the name (since C++ allows new names in any
11103 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11104 declaration. Only look beginning from the current scope outward up
11105 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11107 TEMPLATE_HEADER_P is true when this declaration is preceded by
11108 a set of template parameters. */
11111 xref_tag (enum tag_types tag_code, tree name,
11112 tag_scope scope, bool template_header_p)
11114 enum tree_code code;
11116 tree context = NULL_TREE;
11118 timevar_push (TV_NAME_LOOKUP);
11120 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11126 code = RECORD_TYPE;
11132 code = ENUMERAL_TYPE;
11135 gcc_unreachable ();
11138 /* In case of anonymous name, xref_tag is only called to
11139 make type node and push name. Name lookup is not required. */
11140 if (ANON_AGGRNAME_P (name))
11143 t = lookup_and_check_tag (tag_code, name,
11144 scope, template_header_p);
11146 if (t == error_mark_node)
11147 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11149 if (scope != ts_current && t && current_class_type
11150 && template_class_depth (current_class_type)
11151 && template_header_p)
11153 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11154 definition of this tag. Since, in addition, we are currently
11155 processing a (member) template declaration of a template
11156 class, we must be very careful; consider:
11163 { template <class V>
11164 friend struct S1; };
11166 Here, the S2::S1 declaration should not be confused with the
11167 outer declaration. In particular, the inner version should
11168 have a template parameter of level 2, not level 1. This
11169 would be particularly important if the member declaration
11172 template <class V = U> friend struct S1;
11174 say, when we should tsubst into `U' when instantiating
11175 S2. On the other hand, when presented with:
11185 we must find the inner binding eventually. We
11186 accomplish this by making sure that the new type we
11187 create to represent this declaration has the right
11189 context = TYPE_CONTEXT (t);
11195 /* If no such tag is yet defined, create a forward-reference node
11196 and record it as the "definition".
11197 When a real declaration of this type is found,
11198 the forward-reference will be altered into a real type. */
11199 if (code == ENUMERAL_TYPE)
11201 error ("use of enum %q#D without previous declaration", name);
11202 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11206 t = make_class_type (code);
11207 TYPE_CONTEXT (t) = context;
11208 t = pushtag (name, t, scope);
11213 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11215 if (!redeclare_class_template (t, current_template_parms))
11216 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11218 else if (!processing_template_decl
11219 && CLASS_TYPE_P (t)
11220 && CLASSTYPE_IS_TEMPLATE (t))
11222 error ("redeclaration of %qT as a non-template", t);
11223 error ("previous declaration %q+D", t);
11224 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11227 /* Make injected friend class visible. */
11228 if (scope != ts_within_enclosing_non_class
11229 && hidden_name_p (TYPE_NAME (t)))
11231 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11232 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11234 if (TYPE_TEMPLATE_INFO (t))
11236 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11237 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11242 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11246 xref_tag_from_type (tree old, tree id, tag_scope scope)
11248 enum tag_types tag_kind;
11250 if (TREE_CODE (old) == RECORD_TYPE)
11251 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11253 tag_kind = union_type;
11255 if (id == NULL_TREE)
11256 id = TYPE_IDENTIFIER (old);
11258 return xref_tag (tag_kind, id, scope, false);
11261 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11262 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11263 access_* node, and the TREE_VALUE is the type of the base-class.
11264 Non-NULL TREE_TYPE indicates virtual inheritance.
11266 Returns true if the binfo hierarchy was successfully created,
11267 false if an error was detected. */
11270 xref_basetypes (tree ref, tree base_list)
11273 tree binfo, base_binfo;
11274 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11275 unsigned max_bases = 0; /* Maximum direct bases. */
11277 tree default_access;
11278 tree igo_prev; /* Track Inheritance Graph Order. */
11280 if (ref == error_mark_node)
11283 /* The base of a derived class is private by default, all others are
11285 default_access = (TREE_CODE (ref) == RECORD_TYPE
11286 && CLASSTYPE_DECLARED_CLASS (ref)
11287 ? access_private_node : access_public_node);
11289 /* First, make sure that any templates in base-classes are
11290 instantiated. This ensures that if we call ourselves recursively
11291 we do not get confused about which classes are marked and which
11293 basep = &base_list;
11296 tree basetype = TREE_VALUE (*basep);
11298 if (!(processing_template_decl && uses_template_parms (basetype))
11299 && !complete_type_or_else (basetype, NULL))
11300 /* An incomplete type. Remove it from the list. */
11301 *basep = TREE_CHAIN (*basep);
11305 if (TREE_TYPE (*basep))
11307 if (CLASS_TYPE_P (basetype))
11308 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11309 basep = &TREE_CHAIN (*basep);
11313 TYPE_MARKED_P (ref) = 1;
11315 /* The binfo slot should be empty, unless this is an (ill-formed)
11317 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11319 error ("redefinition of %q#T", ref);
11323 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11325 binfo = make_tree_binfo (max_bases);
11327 TYPE_BINFO (ref) = binfo;
11328 BINFO_OFFSET (binfo) = size_zero_node;
11329 BINFO_TYPE (binfo) = ref;
11331 /* Apply base-class info set up to the variants of this type. */
11332 fixup_type_variants (ref);
11336 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11337 /* An aggregate cannot have baseclasses. */
11338 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11340 if (TREE_CODE (ref) == UNION_TYPE)
11342 error ("derived union %qT invalid", ref);
11349 if (TYPE_FOR_JAVA (ref))
11351 error ("Java class %qT cannot have multiple bases", ref);
11358 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11360 if (TYPE_FOR_JAVA (ref))
11362 error ("Java class %qT cannot have virtual bases", ref);
11367 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11369 tree access = TREE_PURPOSE (base_list);
11370 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11371 tree basetype = TREE_VALUE (base_list);
11373 if (access == access_default_node)
11374 access = default_access;
11376 if (PACK_EXPANSION_P (basetype))
11377 basetype = PACK_EXPANSION_PATTERN (basetype);
11378 if (TREE_CODE (basetype) == TYPE_DECL)
11379 basetype = TREE_TYPE (basetype);
11380 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11382 error ("base type %qT fails to be a struct or class type",
11387 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11388 TYPE_FOR_JAVA (ref) = 1;
11390 base_binfo = NULL_TREE;
11391 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11393 base_binfo = TYPE_BINFO (basetype);
11394 /* The original basetype could have been a typedef'd type. */
11395 basetype = BINFO_TYPE (base_binfo);
11397 /* Inherit flags from the base. */
11398 TYPE_HAS_NEW_OPERATOR (ref)
11399 |= TYPE_HAS_NEW_OPERATOR (basetype);
11400 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11401 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11402 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11403 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11404 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11405 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11406 CLASSTYPE_REPEATED_BASE_P (ref)
11407 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11410 /* We must do this test after we've seen through a typedef
11412 if (TYPE_MARKED_P (basetype))
11414 if (basetype == ref)
11415 error ("recursive type %qT undefined", basetype);
11417 error ("duplicate base type %qT invalid", basetype);
11421 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11422 /* Regenerate the pack expansion for the bases. */
11423 basetype = make_pack_expansion (basetype);
11425 TYPE_MARKED_P (basetype) = 1;
11427 base_binfo = copy_binfo (base_binfo, basetype, ref,
11428 &igo_prev, via_virtual);
11429 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11430 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11432 BINFO_BASE_APPEND (binfo, base_binfo);
11433 BINFO_BASE_ACCESS_APPEND (binfo, access);
11436 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11437 /* If we have space in the vbase vector, we must have shared at
11438 least one of them, and are therefore diamond shaped. */
11439 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11441 /* Unmark all the types. */
11442 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11443 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11444 TYPE_MARKED_P (ref) = 0;
11446 /* Now see if we have a repeated base type. */
11447 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11449 for (base_binfo = binfo; base_binfo;
11450 base_binfo = TREE_CHAIN (base_binfo))
11452 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11454 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11457 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11459 for (base_binfo = binfo; base_binfo;
11460 base_binfo = TREE_CHAIN (base_binfo))
11461 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11462 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11471 /* Copies the enum-related properties from type SRC to type DST.
11472 Used with the underlying type of an enum and the enum itself. */
11474 copy_type_enum (tree dst, tree src)
11476 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11477 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11478 TYPE_SIZE (dst) = TYPE_SIZE (src);
11479 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11480 SET_TYPE_MODE (dst, TYPE_MODE (src));
11481 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11482 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11483 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11484 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11487 /* Begin compiling the definition of an enumeration type.
11490 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11492 UNDERLYING_TYPE is the type that will be used as the storage for
11493 the enumeration type. This should be NULL_TREE if no storage type
11496 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11498 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11500 Returns the type object, as yet incomplete.
11501 Also records info about it so that build_enumerator
11502 may be used to declare the individual values as they are read. */
11505 start_enum (tree name, tree enumtype, tree underlying_type,
11506 bool scoped_enum_p, bool *is_new)
11508 tree prevtype = NULL_TREE;
11509 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11513 /* [C++0x dcl.enum]p5:
11515 If not explicitly specified, the underlying type of a scoped
11516 enumeration type is int. */
11517 if (!underlying_type && scoped_enum_p)
11518 underlying_type = integer_type_node;
11520 if (underlying_type)
11521 underlying_type = cv_unqualified (underlying_type);
11523 /* If this is the real definition for a previous forward reference,
11524 fill in the contents in the same object that used to be the
11525 forward reference. */
11527 enumtype = lookup_and_check_tag (enum_type, name,
11528 /*tag_scope=*/ts_current,
11529 /*template_header_p=*/false);
11531 /* In case of a template_decl, the only check that should be deferred
11532 to instantiation time is the comparison of underlying types. */
11533 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11535 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11537 error_at (input_location, "scoped/unscoped mismatch "
11538 "in enum %q#T", enumtype);
11539 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11540 "previous definition here");
11541 enumtype = error_mark_node;
11543 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11545 error_at (input_location, "underlying type mismatch "
11546 "in enum %q#T", enumtype);
11547 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11548 "previous definition here");
11549 enumtype = error_mark_node;
11551 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11552 && !dependent_type_p (underlying_type)
11553 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11554 && !same_type_p (underlying_type,
11555 ENUM_UNDERLYING_TYPE (enumtype)))
11557 error_at (input_location, "different underlying type "
11558 "in enum %q#T", enumtype);
11559 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11560 "previous definition here");
11561 underlying_type = NULL_TREE;
11565 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11566 || processing_template_decl)
11568 /* In case of error, make a dummy enum to allow parsing to
11570 if (enumtype == error_mark_node)
11572 name = make_anon_name ();
11573 enumtype = NULL_TREE;
11576 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11577 of an opaque enum, or an opaque enum of an already defined
11578 enumeration (C++0x only).
11579 In any other case, it'll be NULL_TREE. */
11585 prevtype = enumtype;
11586 enumtype = cxx_make_type (ENUMERAL_TYPE);
11587 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11588 if (enumtype == error_mark_node)
11589 return error_mark_node;
11591 /* The enum is considered opaque until the opening '{' of the
11592 enumerator list. */
11593 SET_OPAQUE_ENUM_P (enumtype, true);
11594 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11597 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11599 if (underlying_type)
11601 if (CP_INTEGRAL_TYPE_P (underlying_type))
11603 copy_type_enum (enumtype, underlying_type);
11604 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11606 else if (dependent_type_p (underlying_type))
11607 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11609 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11610 underlying_type, enumtype);
11613 /* If into a template class, the returned enum is always the first
11614 declaration (opaque or not) seen. This way all the references to
11615 this type will be to the same declaration. The following ones are used
11616 only to check for definition errors. */
11617 if (prevtype && processing_template_decl)
11623 /* After processing and defining all the values of an enumeration type,
11624 install their decls in the enumeration type.
11625 ENUMTYPE is the type object. */
11628 finish_enum_value_list (tree enumtype)
11631 tree underlying_type;
11634 tree minnode, maxnode;
11637 bool fixed_underlying_type_p
11638 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11640 /* We built up the VALUES in reverse order. */
11641 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11643 /* For an enum defined in a template, just set the type of the values;
11644 all further processing is postponed until the template is
11645 instantiated. We need to set the type so that tsubst of a CONST_DECL
11647 if (processing_template_decl)
11649 for (values = TYPE_VALUES (enumtype);
11651 values = TREE_CHAIN (values))
11652 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11656 /* Determine the minimum and maximum values of the enumerators. */
11657 if (TYPE_VALUES (enumtype))
11659 minnode = maxnode = NULL_TREE;
11661 for (values = TYPE_VALUES (enumtype);
11663 values = TREE_CHAIN (values))
11665 decl = TREE_VALUE (values);
11667 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11668 each enumerator has the type of its enumeration. Prior to the
11669 closing brace, the type of each enumerator is the type of its
11670 initializing value. */
11671 TREE_TYPE (decl) = enumtype;
11673 /* Update the minimum and maximum values, if appropriate. */
11674 value = DECL_INITIAL (decl);
11675 if (value == error_mark_node)
11676 value = integer_zero_node;
11677 /* Figure out what the minimum and maximum values of the
11678 enumerators are. */
11680 minnode = maxnode = value;
11681 else if (tree_int_cst_lt (maxnode, value))
11683 else if (tree_int_cst_lt (value, minnode))
11690 If the enumerator-list is empty, the underlying type is as if
11691 the enumeration had a single enumerator with value 0. */
11692 minnode = maxnode = integer_zero_node;
11694 if (!fixed_underlying_type_p)
11696 /* Compute the number of bits require to represent all values of the
11697 enumeration. We must do this before the type of MINNODE and
11698 MAXNODE are transformed, since tree_int_cst_min_precision relies
11699 on the TREE_TYPE of the value it is passed. */
11700 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11701 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11702 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11703 int precision = MAX (lowprec, highprec);
11705 bool use_short_enum;
11707 /* Determine the underlying type of the enumeration.
11711 The underlying type of an enumeration is an integral type that
11712 can represent all the enumerator values defined in the
11713 enumeration. It is implementation-defined which integral type is
11714 used as the underlying type for an enumeration except that the
11715 underlying type shall not be larger than int unless the value of
11716 an enumerator cannot fit in an int or unsigned int.
11718 We use "int" or an "unsigned int" as the underlying type, even if
11719 a smaller integral type would work, unless the user has
11720 explicitly requested that we use the smallest possible type. The
11721 user can request that for all enumerations with a command line
11722 flag, or for just one enumeration with an attribute. */
11724 use_short_enum = flag_short_enums
11725 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11727 for (itk = (use_short_enum ? itk_char : itk_int);
11731 underlying_type = integer_types[itk];
11732 if (underlying_type != NULL_TREE
11733 && TYPE_PRECISION (underlying_type) >= precision
11734 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11737 if (itk == itk_none)
11741 IF no integral type can represent all the enumerator values, the
11742 enumeration is ill-formed. */
11743 error ("no integral type can represent all of the enumerator values "
11744 "for %qT", enumtype);
11745 precision = TYPE_PRECISION (long_long_integer_type_node);
11746 underlying_type = integer_types[itk_unsigned_long_long];
11751 The value of sizeof() applied to an enumeration type, an object
11752 of an enumeration type, or an enumerator, is the value of sizeof()
11753 applied to the underlying type. */
11754 copy_type_enum (enumtype, underlying_type);
11756 /* Compute the minimum and maximum values for the type.
11760 For an enumeration where emin is the smallest enumerator and emax
11761 is the largest, the values of the enumeration are the values of the
11762 underlying type in the range bmin to bmax, where bmin and bmax are,
11763 respectively, the smallest and largest values of the smallest bit-
11764 field that can store emin and emax. */
11766 /* The middle-end currently assumes that types with TYPE_PRECISION
11767 narrower than their underlying type are suitably zero or sign
11768 extended to fill their mode. Similarly, it assumes that the front
11769 end assures that a value of a particular type must be within
11770 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11772 We used to set these fields based on bmin and bmax, but that led
11773 to invalid assumptions like optimizing away bounds checking. So
11774 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11775 TYPE_MAX_VALUE to the values for the mode above and only restrict
11776 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11777 ENUM_UNDERLYING_TYPE (enumtype)
11778 = build_distinct_type_copy (underlying_type);
11779 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11780 set_min_and_max_values_for_integral_type
11781 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11783 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11784 if (flag_strict_enums)
11785 set_min_and_max_values_for_integral_type (enumtype, precision,
11789 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11791 /* Convert each of the enumerators to the type of the underlying
11792 type of the enumeration. */
11793 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11795 location_t saved_location;
11797 decl = TREE_VALUE (values);
11798 saved_location = input_location;
11799 input_location = DECL_SOURCE_LOCATION (decl);
11800 if (fixed_underlying_type_p)
11801 /* If the enumeration type has a fixed underlying type, we
11802 already checked all of the enumerator values. */
11803 value = DECL_INITIAL (decl);
11805 value = perform_implicit_conversion (underlying_type,
11806 DECL_INITIAL (decl),
11807 tf_warning_or_error);
11808 input_location = saved_location;
11810 /* Do not clobber shared ints. */
11811 value = copy_node (value);
11813 TREE_TYPE (value) = enumtype;
11814 DECL_INITIAL (decl) = value;
11817 /* Fix up all variant types of this enum type. */
11818 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11819 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11821 /* Finish debugging output for this type. */
11822 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11825 /* Finishes the enum type. This is called only the first time an
11826 enumeration is seen, be it opaque or odinary.
11827 ENUMTYPE is the type object. */
11830 finish_enum (tree enumtype)
11832 if (processing_template_decl)
11834 if (at_function_scope_p ())
11835 add_stmt (build_min (TAG_DEFN, enumtype));
11839 /* Here there should not be any variants of this type. */
11840 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11841 && !TYPE_NEXT_VARIANT (enumtype));
11844 /* Build and install a CONST_DECL for an enumeration constant of the
11845 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11846 LOC is the location of NAME.
11847 Assignment of sequential values by default is handled here. */
11850 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11856 /* If the VALUE was erroneous, pretend it wasn't there; that will
11857 result in the enum being assigned the next value in sequence. */
11858 if (value == error_mark_node)
11861 /* Remove no-op casts from the value. */
11863 STRIP_TYPE_NOPS (value);
11865 if (! processing_template_decl)
11867 /* Validate and default VALUE. */
11868 if (value != NULL_TREE)
11870 value = cxx_constant_value (value);
11872 if (TREE_CODE (value) == INTEGER_CST)
11874 value = perform_integral_promotions (value);
11878 error ("enumerator value for %qD is not an integer constant", name);
11883 /* Default based on previous value. */
11884 if (value == NULL_TREE)
11886 if (TYPE_VALUES (enumtype))
11889 unsigned HOST_WIDE_INT lo;
11893 /* The next value is the previous value plus one.
11894 add_double doesn't know the type of the target expression,
11895 so we must check with int_fits_type_p as well. */
11896 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11897 if (error_operand_p (prev_value))
11898 value = error_mark_node;
11901 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11902 TREE_INT_CST_HIGH (prev_value),
11904 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11906 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11910 error ("overflow in enumeration values at %qD", name);
11911 value = error_mark_node;
11916 value = integer_zero_node;
11919 /* Remove no-op casts from the value. */
11920 STRIP_TYPE_NOPS (value);
11922 /* If the underlying type of the enum is fixed, check whether
11923 the enumerator values fits in the underlying type. If it
11924 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11925 if (ENUM_UNDERLYING_TYPE (enumtype)
11927 && TREE_CODE (value) == INTEGER_CST
11928 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11930 error ("enumerator value %E is too large for underlying type %<%T%>",
11931 value, ENUM_UNDERLYING_TYPE (enumtype));
11933 /* Silently convert the value so that we can continue. */
11934 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11939 /* C++ associates enums with global, function, or class declarations. */
11940 context = current_scope ();
11942 /* Build the actual enumeration constant. Note that the enumeration
11943 constants have the underlying type of the enum (if it is fixed)
11944 or the type of their initializer (if the underlying type of the
11945 enum is not fixed):
11949 If the underlying type is fixed, the type of each enumerator
11950 prior to the closing brace is the underlying type; if the
11951 initializing value of an enumerator cannot be represented by
11952 the underlying type, the program is ill-formed. If the
11953 underlying type is not fixed, the type of each enumerator is
11954 the type of its initializing value.
11956 If the underlying type is not fixed, it will be computed by
11957 finish_enum and we will reset the type of this enumerator. Of
11958 course, if we're processing a template, there may be no value. */
11959 type = value ? TREE_TYPE (value) : NULL_TREE;
11961 if (context && context == current_class_type)
11962 /* This enum declaration is local to the class. We need the full
11963 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11964 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11966 /* It's a global enum, or it's local to a function. (Note local to
11967 a function could mean local to a class method. */
11968 decl = build_decl (loc, CONST_DECL, name, type);
11970 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11971 TREE_CONSTANT (decl) = 1;
11972 TREE_READONLY (decl) = 1;
11973 DECL_INITIAL (decl) = value;
11975 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11976 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11977 on the TYPE_FIELDS list for `S'. (That's so that you can say
11978 things like `S::i' later.) */
11979 finish_member_declaration (decl);
11983 /* Add this enumeration constant to the list for this type. */
11984 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11987 /* Look for an enumerator with the given NAME within the enumeration
11988 type ENUMTYPE. This routine is used primarily for qualified name
11989 lookup into an enumerator in C++0x, e.g.,
11991 enum class Color { Red, Green, Blue };
11993 Color color = Color::Red;
11995 Returns the value corresponding to the enumerator, or
11996 NULL_TREE if no such enumerator was found. */
11998 lookup_enumerator (tree enumtype, tree name)
12001 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12003 e = purpose_member (name, TYPE_VALUES (enumtype));
12004 return e? TREE_VALUE (e) : NULL_TREE;
12008 /* We're defining DECL. Make sure that its type is OK. */
12011 check_function_type (tree decl, tree current_function_parms)
12013 tree fntype = TREE_TYPE (decl);
12014 tree return_type = complete_type (TREE_TYPE (fntype));
12016 /* In a function definition, arg types must be complete. */
12017 require_complete_types_for_parms (current_function_parms);
12019 if (dependent_type_p (return_type))
12021 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12022 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12024 tree args = TYPE_ARG_TYPES (fntype);
12026 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12027 error ("return type %q#T is incomplete", return_type);
12029 error ("return type has Java class type %q#T", return_type);
12031 /* Make it return void instead. */
12032 if (TREE_CODE (fntype) == METHOD_TYPE)
12033 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12035 TREE_CHAIN (args));
12037 fntype = build_function_type (void_type_node, args);
12039 = build_exception_variant (fntype,
12040 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12041 fntype = (cp_build_type_attribute_variant
12042 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12043 TREE_TYPE (decl) = fntype;
12046 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12049 /* Create the FUNCTION_DECL for a function definition.
12050 DECLSPECS and DECLARATOR are the parts of the declaration;
12051 they describe the function's name and the type it returns,
12052 but twisted together in a fashion that parallels the syntax of C.
12054 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12055 DECLARATOR is really the DECL for the function we are about to
12056 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12057 indicating that the function is an inline defined in-class.
12059 This function creates a binding context for the function body
12060 as well as setting up the FUNCTION_DECL in current_function_decl.
12062 For C++, we must first check whether that datum makes any sense.
12063 For example, "class A local_a(1,2);" means that variable local_a
12064 is an aggregate of type A, which should have a constructor
12065 applied to it with the argument list [1, 2].
12067 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12068 or may be a BLOCK if the function has been defined previously
12069 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12070 error_mark_node if the function has never been defined, or
12071 a BLOCK if the function has been defined somewhere. */
12074 start_preparsed_function (tree decl1, tree attrs, int flags)
12076 tree ctype = NULL_TREE;
12079 int doing_friend = 0;
12080 struct cp_binding_level *bl;
12081 tree current_function_parms;
12082 struct c_fileinfo *finfo
12083 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12084 bool honor_interface;
12086 /* Sanity check. */
12087 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12088 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12090 fntype = TREE_TYPE (decl1);
12091 if (TREE_CODE (fntype) == METHOD_TYPE)
12092 ctype = TYPE_METHOD_BASETYPE (fntype);
12094 /* ISO C++ 11.4/5. A friend function defined in a class is in
12095 the (lexical) scope of the class in which it is defined. */
12096 if (!ctype && DECL_FRIEND_P (decl1))
12098 ctype = DECL_FRIEND_CONTEXT (decl1);
12100 /* CTYPE could be null here if we're dealing with a template;
12101 for example, `inline friend float foo()' inside a template
12102 will have no CTYPE set. */
12103 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12109 if (DECL_DECLARED_INLINE_P (decl1)
12110 && lookup_attribute ("noinline", attrs))
12111 warning (0, "inline function %q+D given attribute noinline", decl1);
12113 /* Handle gnu_inline attribute. */
12114 if (GNU_INLINE_P (decl1))
12116 DECL_EXTERNAL (decl1) = 1;
12117 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12118 DECL_INTERFACE_KNOWN (decl1) = 1;
12119 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12122 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12123 /* This is a constructor, we must ensure that any default args
12124 introduced by this definition are propagated to the clones
12125 now. The clones are used directly in overload resolution. */
12126 adjust_clone_args (decl1);
12128 /* Sometimes we don't notice that a function is a static member, and
12129 build a METHOD_TYPE for it. Fix that up now. */
12130 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12131 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12133 revert_static_member_fn (decl1);
12137 /* Set up current_class_type, and enter the scope of the class, if
12140 push_nested_class (ctype);
12141 else if (DECL_STATIC_FUNCTION_P (decl1))
12142 push_nested_class (DECL_CONTEXT (decl1));
12144 /* Now that we have entered the scope of the class, we must restore
12145 the bindings for any template parameters surrounding DECL1, if it
12146 is an inline member template. (Order is important; consider the
12147 case where a template parameter has the same name as a field of
12148 the class.) It is not until after this point that
12149 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12150 if (flags & SF_INCLASS_INLINE)
12151 maybe_begin_member_template_processing (decl1);
12153 /* Effective C++ rule 15. */
12155 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12156 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12157 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12159 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12160 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12161 if (!DECL_INITIAL (decl1))
12162 DECL_INITIAL (decl1) = error_mark_node;
12164 /* This function exists in static storage.
12165 (This does not mean `static' in the C sense!) */
12166 TREE_STATIC (decl1) = 1;
12168 /* We must call push_template_decl after current_class_type is set
12169 up. (If we are processing inline definitions after exiting a
12170 class scope, current_class_type will be NULL_TREE until set above
12171 by push_nested_class.) */
12172 if (processing_template_decl)
12174 /* FIXME: Handle error_mark_node more gracefully. */
12175 tree newdecl1 = push_template_decl (decl1);
12176 if (newdecl1 != error_mark_node)
12180 /* We are now in the scope of the function being defined. */
12181 current_function_decl = decl1;
12183 /* Save the parm names or decls from this function's declarator
12184 where store_parm_decls will find them. */
12185 current_function_parms = DECL_ARGUMENTS (decl1);
12187 /* Make sure the parameter and return types are reasonable. When
12188 you declare a function, these types can be incomplete, but they
12189 must be complete when you define the function. */
12190 check_function_type (decl1, current_function_parms);
12192 /* Build the return declaration for the function. */
12193 restype = TREE_TYPE (fntype);
12194 if (DECL_RESULT (decl1) == NULL_TREE)
12198 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12199 DECL_ARTIFICIAL (resdecl) = 1;
12200 DECL_IGNORED_P (resdecl) = 1;
12201 DECL_RESULT (decl1) = resdecl;
12203 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12206 /* Let the user know we're compiling this function. */
12207 announce_function (decl1);
12209 /* Record the decl so that the function name is defined.
12210 If we already have a decl for this name, and it is a FUNCTION_DECL,
12211 use the old decl. */
12212 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12214 /* A specialization is not used to guide overload resolution. */
12215 if (!DECL_FUNCTION_MEMBER_P (decl1)
12216 && !(DECL_USE_TEMPLATE (decl1) &&
12217 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12219 tree olddecl = pushdecl (decl1);
12221 if (olddecl == error_mark_node)
12222 /* If something went wrong when registering the declaration,
12223 use DECL1; we have to have a FUNCTION_DECL to use when
12224 parsing the body of the function. */
12228 /* Otherwise, OLDDECL is either a previous declaration
12229 of the same function or DECL1 itself. */
12231 if (warn_missing_declarations
12232 && olddecl == decl1
12233 && !DECL_MAIN_P (decl1)
12234 && TREE_PUBLIC (decl1)
12235 && !DECL_DECLARED_INLINE_P (decl1))
12239 /* Check whether DECL1 is in an anonymous
12241 for (context = DECL_CONTEXT (decl1);
12243 context = DECL_CONTEXT (context))
12245 if (TREE_CODE (context) == NAMESPACE_DECL
12246 && DECL_NAME (context) == NULL_TREE)
12250 if (context == NULL)
12251 warning (OPT_Wmissing_declarations,
12252 "no previous declaration for %q+D", decl1);
12260 /* We need to set the DECL_CONTEXT. */
12261 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12262 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12264 fntype = TREE_TYPE (decl1);
12266 /* If #pragma weak applies, mark the decl appropriately now.
12267 The pragma only applies to global functions. Because
12268 determining whether or not the #pragma applies involves
12269 computing the mangled name for the declaration, we cannot
12270 apply the pragma until after we have merged this declaration
12271 with any previous declarations; if the original declaration
12272 has a linkage specification, that specification applies to
12273 the definition as well, and may affect the mangled name. */
12274 if (DECL_FILE_SCOPE_P (decl1))
12275 maybe_apply_pragma_weak (decl1);
12278 /* constexpr functions must have literal argument types and
12279 literal return type. */
12280 validate_constexpr_fundecl (decl1);
12282 /* Reset this in case the call to pushdecl changed it. */
12283 current_function_decl = decl1;
12285 gcc_assert (DECL_INITIAL (decl1));
12287 /* This function may already have been parsed, in which case just
12288 return; our caller will skip over the body without parsing. */
12289 if (DECL_INITIAL (decl1) != error_mark_node)
12292 /* Initialize RTL machinery. We cannot do this until
12293 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12294 even when processing a template; this is how we get
12295 CFUN set up, and our per-function variables initialized.
12296 FIXME factor out the non-RTL stuff. */
12297 bl = current_binding_level;
12298 allocate_struct_function (decl1, processing_template_decl);
12300 /* Initialize the language data structures. Whenever we start
12301 a new function, we destroy temporaries in the usual way. */
12302 cfun->language = ggc_alloc_cleared_language_function ();
12303 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12304 current_binding_level = bl;
12306 /* Even though we're inside a function body, we still don't want to
12307 call expand_expr to calculate the size of a variable-sized array.
12308 We haven't necessarily assigned RTL to all variables yet, so it's
12309 not safe to try to expand expressions involving them. */
12310 cfun->dont_save_pending_sizes_p = 1;
12312 /* Start the statement-tree, start the tree now. */
12313 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12315 /* If we are (erroneously) defining a function that we have already
12316 defined before, wipe out what we knew before. */
12317 if (!DECL_PENDING_INLINE_P (decl1))
12318 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12320 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12322 /* We know that this was set up by `grokclassfn'. We do not
12323 wait until `store_parm_decls', since evil parse errors may
12324 never get us to that point. Here we keep the consistency
12325 between `current_class_type' and `current_class_ptr'. */
12326 tree t = DECL_ARGUMENTS (decl1);
12328 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12329 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12331 cp_function_chain->x_current_class_ref
12332 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12333 cp_function_chain->x_current_class_ptr = t;
12335 /* Constructors and destructors need to know whether they're "in
12336 charge" of initializing virtual base classes. */
12337 t = DECL_CHAIN (t);
12338 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12340 current_in_charge_parm = t;
12341 t = DECL_CHAIN (t);
12343 if (DECL_HAS_VTT_PARM_P (decl1))
12345 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12346 current_vtt_parm = t;
12350 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12351 /* Implicitly-defined methods (like the
12352 destructor for a class in which no destructor
12353 is explicitly declared) must not be defined
12354 until their definition is needed. So, we
12355 ignore interface specifications for
12356 compiler-generated functions. */
12357 && !DECL_ARTIFICIAL (decl1));
12359 if (DECL_INTERFACE_KNOWN (decl1))
12361 tree ctx = decl_function_context (decl1);
12363 if (DECL_NOT_REALLY_EXTERN (decl1))
12364 DECL_EXTERNAL (decl1) = 0;
12366 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12367 && TREE_PUBLIC (ctx))
12368 /* This is a function in a local class in an extern inline
12370 comdat_linkage (decl1);
12372 /* If this function belongs to an interface, it is public.
12373 If it belongs to someone else's interface, it is also external.
12374 This only affects inlines and template instantiations. */
12375 else if (!finfo->interface_unknown && honor_interface)
12377 if (DECL_DECLARED_INLINE_P (decl1)
12378 || DECL_TEMPLATE_INSTANTIATION (decl1)
12379 || processing_template_decl)
12381 DECL_EXTERNAL (decl1)
12382 = (finfo->interface_only
12383 || (DECL_DECLARED_INLINE_P (decl1)
12384 && ! flag_implement_inlines
12385 && !DECL_VINDEX (decl1)));
12387 /* For WIN32 we also want to put these in linkonce sections. */
12388 maybe_make_one_only (decl1);
12391 DECL_EXTERNAL (decl1) = 0;
12392 DECL_INTERFACE_KNOWN (decl1) = 1;
12393 /* If this function is in an interface implemented in this file,
12394 make sure that the back end knows to emit this function
12396 if (!DECL_EXTERNAL (decl1))
12397 mark_needed (decl1);
12399 else if (finfo->interface_unknown && finfo->interface_only
12400 && honor_interface)
12402 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12403 interface, we will have both finfo->interface_unknown and
12404 finfo->interface_only set. In that case, we don't want to
12405 use the normal heuristics because someone will supply a
12406 #pragma implementation elsewhere, and deducing it here would
12407 produce a conflict. */
12408 comdat_linkage (decl1);
12409 DECL_EXTERNAL (decl1) = 0;
12410 DECL_INTERFACE_KNOWN (decl1) = 1;
12411 DECL_DEFER_OUTPUT (decl1) = 1;
12415 /* This is a definition, not a reference.
12416 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12417 if (!GNU_INLINE_P (decl1))
12418 DECL_EXTERNAL (decl1) = 0;
12420 if ((DECL_DECLARED_INLINE_P (decl1)
12421 || DECL_TEMPLATE_INSTANTIATION (decl1))
12422 && ! DECL_INTERFACE_KNOWN (decl1))
12423 DECL_DEFER_OUTPUT (decl1) = 1;
12425 DECL_INTERFACE_KNOWN (decl1) = 1;
12428 /* Determine the ELF visibility attribute for the function. We must not
12429 do this before calling "pushdecl", as we must allow "duplicate_decls"
12430 to merge any attributes appropriately. We also need to wait until
12432 if (!DECL_CLONED_FUNCTION_P (decl1))
12433 determine_visibility (decl1);
12435 begin_scope (sk_function_parms, decl1);
12439 if (DECL_DESTRUCTOR_P (decl1)
12440 || (DECL_CONSTRUCTOR_P (decl1)
12441 && targetm.cxx.cdtor_returns_this ()))
12443 cdtor_label = build_decl (input_location,
12444 LABEL_DECL, NULL_TREE, NULL_TREE);
12445 DECL_CONTEXT (cdtor_label) = current_function_decl;
12448 start_fname_decls ();
12450 store_parm_decls (current_function_parms);
12454 /* Like start_preparsed_function, except that instead of a
12455 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12457 Returns 1 on success. If the DECLARATOR is not suitable for a function
12458 (it defines a datum instead), we return 0, which tells
12459 yyparse to report a parse error. */
12462 start_function (cp_decl_specifier_seq *declspecs,
12463 const cp_declarator *declarator,
12468 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12469 if (decl1 == error_mark_node)
12471 /* If the declarator is not suitable for a function definition,
12472 cause a syntax error. */
12473 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12475 error ("invalid function declaration");
12479 if (DECL_MAIN_P (decl1))
12480 /* main must return int. grokfndecl should have corrected it
12481 (and issued a diagnostic) if the user got it wrong. */
12482 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12483 integer_type_node));
12485 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12490 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12494 use_eh_spec_block (tree fn)
12496 return (flag_exceptions && flag_enforce_eh_specs
12497 && !processing_template_decl
12498 && !type_throw_all_p (TREE_TYPE (fn))
12499 /* We insert the EH_SPEC_BLOCK only in the original
12500 function; then, it is copied automatically to the
12502 && !DECL_CLONED_FUNCTION_P (fn)
12503 /* Implicitly-generated constructors and destructors have
12504 exception specifications. However, those specifications
12505 are the union of the possible exceptions specified by the
12506 constructors/destructors for bases and members, so no
12507 unallowed exception will ever reach this function. By
12508 not creating the EH_SPEC_BLOCK we save a little memory,
12509 and we avoid spurious warnings about unreachable
12511 && !DECL_ARTIFICIAL (fn));
12514 /* Store the parameter declarations into the current function declaration.
12515 This is called after parsing the parameter declarations, before
12516 digesting the body of the function.
12518 Also install to binding contour return value identifier, if any. */
12521 store_parm_decls (tree current_function_parms)
12523 tree fndecl = current_function_decl;
12526 /* This is a chain of any other decls that came in among the parm
12527 declarations. If a parm is declared with enum {foo, bar} x;
12528 then CONST_DECLs for foo and bar are put here. */
12529 tree nonparms = NULL_TREE;
12531 if (current_function_parms)
12533 /* This case is when the function was defined with an ANSI prototype.
12534 The parms already have decls, so we need not do anything here
12535 except record them as in effect
12536 and complain if any redundant old-style parm decls were written. */
12538 tree specparms = current_function_parms;
12541 /* Must clear this because it might contain TYPE_DECLs declared
12543 current_binding_level->names = NULL;
12545 /* If we're doing semantic analysis, then we'll call pushdecl
12546 for each of these. We must do them in reverse order so that
12547 they end in the correct forward order. */
12548 specparms = nreverse (specparms);
12550 for (parm = specparms; parm; parm = next)
12552 next = DECL_CHAIN (parm);
12553 if (TREE_CODE (parm) == PARM_DECL)
12555 if (DECL_NAME (parm) == NULL_TREE
12556 || TREE_CODE (parm) != VOID_TYPE)
12559 error ("parameter %qD declared void", parm);
12563 /* If we find an enum constant or a type tag,
12564 put it aside for the moment. */
12565 TREE_CHAIN (parm) = NULL_TREE;
12566 nonparms = chainon (nonparms, parm);
12570 /* Get the decls in their original chain order and record in the
12571 function. This is all and only the PARM_DECLs that were
12572 pushed into scope by the loop above. */
12573 DECL_ARGUMENTS (fndecl) = getdecls ();
12576 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12578 /* Now store the final chain of decls for the arguments
12579 as the decl-chain of the current lexical scope.
12580 Put the enumerators in as well, at the front so that
12581 DECL_ARGUMENTS is not modified. */
12582 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12584 if (use_eh_spec_block (current_function_decl))
12585 current_eh_spec_block = begin_eh_spec_block ();
12589 /* We have finished doing semantic analysis on DECL, but have not yet
12590 generated RTL for its body. Save away our current state, so that
12591 when we want to generate RTL later we know what to do. */
12594 save_function_data (tree decl)
12596 struct language_function *f;
12598 /* Save the language-specific per-function data so that we can
12599 get it back when we really expand this function. */
12600 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12603 f = ggc_alloc_language_function ();
12604 memcpy (f, cp_function_chain, sizeof (struct language_function));
12605 DECL_SAVED_FUNCTION_DATA (decl) = f;
12607 /* Clear out the bits we don't need. */
12608 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12609 f->bindings = NULL;
12610 f->x_local_names = NULL;
12614 /* Set the return value of the constructor (if present). */
12617 finish_constructor_body (void)
12622 if (targetm.cxx.cdtor_returns_this ()
12623 && (! TYPE_FOR_JAVA (current_class_type)))
12625 /* Any return from a constructor will end up here. */
12626 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12628 val = DECL_ARGUMENTS (current_function_decl);
12629 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12630 DECL_RESULT (current_function_decl), val);
12631 /* Return the address of the object. */
12632 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12633 add_stmt (exprstmt);
12637 /* Do all the processing for the beginning of a destructor; set up the
12638 vtable pointers and cleanups for bases and members. */
12641 begin_destructor_body (void)
12643 tree compound_stmt;
12645 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12646 issued an error message. We still want to try to process the
12647 body of the function, but initialize_vtbl_ptrs will crash if
12648 TYPE_BINFO is NULL. */
12649 if (COMPLETE_TYPE_P (current_class_type))
12651 compound_stmt = begin_compound_stmt (0);
12652 /* Make all virtual function table pointers in non-virtual base
12653 classes point to CURRENT_CLASS_TYPE's virtual function
12655 initialize_vtbl_ptrs (current_class_ptr);
12656 finish_compound_stmt (compound_stmt);
12658 /* And insert cleanups for our bases and members so that they
12659 will be properly destroyed if we throw. */
12660 push_base_cleanups ();
12664 /* At the end of every destructor we generate code to delete the object if
12665 necessary. Do that now. */
12668 finish_destructor_body (void)
12672 /* Any return from a destructor will end up here; that way all base
12673 and member cleanups will be run when the function returns. */
12674 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12676 /* In a virtual destructor, we must call delete. */
12677 if (DECL_VIRTUAL_P (current_function_decl))
12680 tree virtual_size = cxx_sizeof (current_class_type);
12684 At the point of definition of a virtual destructor (including
12685 an implicit definition), non-placement operator delete shall
12686 be looked up in the scope of the destructor's class and if
12687 found shall be accessible and unambiguous. */
12688 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12690 /*global_p=*/false,
12691 /*placement=*/NULL_TREE,
12692 /*alloc_fn=*/NULL_TREE);
12694 if_stmt = begin_if_stmt ();
12695 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12696 current_in_charge_parm,
12699 finish_expr_stmt (exprstmt);
12700 finish_then_clause (if_stmt);
12701 finish_if_stmt (if_stmt);
12704 if (targetm.cxx.cdtor_returns_this ())
12708 val = DECL_ARGUMENTS (current_function_decl);
12709 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12710 DECL_RESULT (current_function_decl), val);
12711 /* Return the address of the object. */
12712 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12713 add_stmt (exprstmt);
12717 /* Do the necessary processing for the beginning of a function body, which
12718 in this case includes member-initializers, but not the catch clauses of
12719 a function-try-block. Currently, this means opening a binding level
12720 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12723 begin_function_body (void)
12727 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12730 if (processing_template_decl)
12731 /* Do nothing now. */;
12733 /* Always keep the BLOCK node associated with the outermost pair of
12734 curly braces of a function. These are needed for correct
12735 operation of dwarfout.c. */
12736 keep_next_level (true);
12738 stmt = begin_compound_stmt (BCS_FN_BODY);
12740 if (processing_template_decl)
12741 /* Do nothing now. */;
12742 else if (DECL_DESTRUCTOR_P (current_function_decl))
12743 begin_destructor_body ();
12748 /* Do the processing for the end of a function body. Currently, this means
12749 closing out the cleanups for fully-constructed bases and members, and in
12750 the case of the destructor, deleting the object if desired. Again, this
12751 is only meaningful for [cd]tors, since they are the only functions where
12752 there is a significant distinction between the main body and any
12753 function catch clauses. Handling, say, main() return semantics here
12754 would be wrong, as flowing off the end of a function catch clause for
12755 main() would also need to return 0. */
12758 finish_function_body (tree compstmt)
12760 if (compstmt == NULL_TREE)
12763 /* Close the block. */
12764 finish_compound_stmt (compstmt);
12766 if (processing_template_decl)
12767 /* Do nothing now. */;
12768 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12769 finish_constructor_body ();
12770 else if (DECL_DESTRUCTOR_P (current_function_decl))
12771 finish_destructor_body ();
12774 /* Given a function, returns the BLOCK corresponding to the outermost level
12775 of curly braces, skipping the artificial block created for constructor
12779 outer_curly_brace_block (tree fndecl)
12781 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12782 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12783 /* Skip the artificial function body block. */
12784 block = BLOCK_SUBBLOCKS (block);
12788 /* If FNDECL is a class's key method, add the class to the list of
12789 keyed classes that should be emitted. */
12792 record_key_method_defined (tree fndecl)
12794 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12795 && DECL_VIRTUAL_P (fndecl)
12796 && !processing_template_decl)
12798 tree fnclass = DECL_CONTEXT (fndecl);
12799 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12800 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12804 /* Subroutine of finish_function.
12805 Save the body of constexpr functions for possible
12806 future compile time evaluation. */
12809 maybe_save_function_definition (tree fun)
12811 if (!processing_template_decl
12812 && DECL_DECLARED_CONSTEXPR_P (fun)
12813 && !DECL_CLONED_FUNCTION_P (fun))
12814 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12817 /* Finish up a function declaration and compile that function
12818 all the way to assembler language output. The free the storage
12819 for the function definition.
12821 FLAGS is a bitwise or of the following values:
12823 We just finished processing the body of an in-class inline
12824 function definition. (This processing will have taken place
12825 after the class definition is complete.) */
12828 finish_function (int flags)
12830 tree fndecl = current_function_decl;
12831 tree fntype, ctype = NULL_TREE;
12832 int inclass_inline = (flags & 2) != 0;
12834 /* When we get some parse errors, we can end up without a
12835 current_function_decl, so cope. */
12836 if (fndecl == NULL_TREE)
12837 return error_mark_node;
12839 if (c_dialect_objc ())
12840 objc_finish_function ();
12842 gcc_assert (!defer_mark_used_calls);
12843 defer_mark_used_calls = true;
12845 record_key_method_defined (fndecl);
12847 fntype = TREE_TYPE (fndecl);
12849 /* TREE_READONLY (fndecl) = 1;
12850 This caused &foo to be of type ptr-to-const-function
12851 which then got a warning when stored in a ptr-to-function variable. */
12853 gcc_assert (building_stmt_tree ());
12854 /* The current function is being defined, so its DECL_INITIAL should
12855 be set, and unless there's a multiple definition, it should be
12856 error_mark_node. */
12857 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12859 /* For a cloned function, we've already got all the code we need;
12860 there's no need to add any extra bits. */
12861 if (!DECL_CLONED_FUNCTION_P (fndecl))
12863 if (DECL_MAIN_P (current_function_decl))
12867 /* Make it so that `main' always returns 0 by default (or
12870 stmt = finish_return_stmt (integer_one_node);
12872 stmt = finish_return_stmt (integer_zero_node);
12874 /* Hack. We don't want the middle-end to warn that this
12875 return is unreachable, so put the statement on the
12878 location_t linezero = linemap_line_start (line_table, 0, 1);
12879 SET_EXPR_LOCATION (stmt, linezero);
12883 if (use_eh_spec_block (current_function_decl))
12884 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12885 (TREE_TYPE (current_function_decl)),
12886 current_eh_spec_block);
12889 /* If we're saving up tree structure, tie off the function now. */
12890 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12892 finish_fname_decls ();
12894 /* If this function can't throw any exceptions, remember that. */
12895 if (!processing_template_decl
12896 && !cp_function_chain->can_throw
12897 && !flag_non_call_exceptions
12898 && !decl_replaceable_p (fndecl))
12899 TREE_NOTHROW (fndecl) = 1;
12901 /* This must come after expand_function_end because cleanups might
12902 have declarations (from inline functions) that need to go into
12903 this function's blocks. */
12905 /* If the current binding level isn't the outermost binding level
12906 for this function, either there is a bug, or we have experienced
12907 syntax errors and the statement tree is malformed. */
12908 if (current_binding_level->kind != sk_function_parms)
12910 /* Make sure we have already experienced errors. */
12911 gcc_assert (errorcount);
12913 /* Throw away the broken statement tree and extra binding
12915 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12917 while (current_binding_level->kind != sk_function_parms)
12919 if (current_binding_level->kind == sk_class)
12920 pop_nested_class ();
12922 poplevel (0, 0, 0);
12925 poplevel (1, 0, 1);
12927 /* Statements should always be full-expressions at the outermost set
12928 of curly braces for a function. */
12929 gcc_assert (stmts_are_full_exprs_p ());
12931 /* Save constexpr function body before it gets munged by
12932 the NRV transformation. */
12933 maybe_save_function_definition (fndecl);
12935 /* Set up the named return value optimization, if we can. Candidate
12936 variables are selected in check_return_expr. */
12937 if (current_function_return_value)
12939 tree r = current_function_return_value;
12942 if (r != error_mark_node
12943 /* This is only worth doing for fns that return in memory--and
12944 simpler, since we don't have to worry about promoted modes. */
12945 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12946 /* Only allow this for variables declared in the outer scope of
12947 the function so we know that their lifetime always ends with a
12948 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12949 we were to do this optimization in tree-ssa. */
12950 && (outer = outer_curly_brace_block (fndecl))
12951 && chain_member (r, BLOCK_VARS (outer)))
12952 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12954 current_function_return_value = NULL_TREE;
12957 /* Remember that we were in class scope. */
12958 if (current_class_name)
12959 ctype = current_class_type;
12961 /* Must mark the RESULT_DECL as being in this function. */
12962 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12964 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12965 to the FUNCTION_DECL node itself. */
12966 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12968 /* Save away current state, if appropriate. */
12969 if (!processing_template_decl)
12970 save_function_data (fndecl);
12972 /* Complain if there's just no return statement. */
12973 if (warn_return_type
12974 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12975 && !dependent_type_p (TREE_TYPE (fntype))
12976 && !current_function_returns_value && !current_function_returns_null
12977 /* Don't complain if we abort or throw. */
12978 && !current_function_returns_abnormally
12979 /* Don't complain if we are declared noreturn. */
12980 && !TREE_THIS_VOLATILE (fndecl)
12981 && !DECL_NAME (DECL_RESULT (fndecl))
12982 && !TREE_NO_WARNING (fndecl)
12983 /* Structor return values (if any) are set by the compiler. */
12984 && !DECL_CONSTRUCTOR_P (fndecl)
12985 && !DECL_DESTRUCTOR_P (fndecl))
12987 warning (OPT_Wreturn_type,
12988 "no return statement in function returning non-void");
12989 TREE_NO_WARNING (fndecl) = 1;
12992 /* Store the end of the function, so that we get good line number
12993 info for the epilogue. */
12994 cfun->function_end_locus = input_location;
12996 /* Complain about parameters that are only set, but never otherwise used. */
12997 if (warn_unused_but_set_parameter
12998 && !processing_template_decl
12999 && errorcount == unused_but_set_errorcount
13000 && !DECL_CLONED_FUNCTION_P (fndecl))
13004 for (decl = DECL_ARGUMENTS (fndecl);
13006 decl = DECL_CHAIN (decl))
13007 if (TREE_USED (decl)
13008 && TREE_CODE (decl) == PARM_DECL
13009 && !DECL_READ_P (decl)
13010 && DECL_NAME (decl)
13011 && !DECL_ARTIFICIAL (decl)
13012 && !TREE_NO_WARNING (decl)
13013 && !DECL_IN_SYSTEM_HEADER (decl)
13014 && TREE_TYPE (decl) != error_mark_node
13015 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13016 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13017 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13018 warning (OPT_Wunused_but_set_parameter,
13019 "parameter %q+D set but not used", decl);
13020 unused_but_set_errorcount = errorcount;
13023 /* Genericize before inlining. */
13024 if (!processing_template_decl)
13026 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13027 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13028 cp_genericize (fndecl);
13029 /* Clear out the bits we don't need. */
13030 f->x_current_class_ptr = NULL;
13031 f->x_current_class_ref = NULL;
13032 f->x_eh_spec_block = NULL;
13033 f->x_in_charge_parm = NULL;
13034 f->x_vtt_parm = NULL;
13035 f->x_return_value = NULL;
13036 f->bindings = NULL;
13037 f->extern_decl_map = NULL;
13039 /* Clear out the bits we don't need. */
13040 local_names = NULL;
13042 /* We're leaving the context of this function, so zap cfun. It's still in
13043 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13045 current_function_decl = NULL;
13047 /* If this is an in-class inline definition, we may have to pop the
13048 bindings for the template parameters that we added in
13049 maybe_begin_member_template_processing when start_function was
13051 if (inclass_inline)
13052 maybe_end_member_template_processing ();
13054 /* Leave the scope of the class. */
13056 pop_nested_class ();
13061 current_function_decl = NULL_TREE;
13063 defer_mark_used_calls = false;
13064 if (deferred_mark_used_calls)
13069 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13071 VEC_free (tree, gc, deferred_mark_used_calls);
13077 /* Create the FUNCTION_DECL for a function definition.
13078 DECLSPECS and DECLARATOR are the parts of the declaration;
13079 they describe the return type and the name of the function,
13080 but twisted together in a fashion that parallels the syntax of C.
13082 This function creates a binding context for the function body
13083 as well as setting up the FUNCTION_DECL in current_function_decl.
13085 Returns a FUNCTION_DECL on success.
13087 If the DECLARATOR is not suitable for a function (it defines a datum
13088 instead), we return 0, which tells yyparse to report a parse error.
13090 May return void_type_node indicating that this method is actually
13091 a friend. See grokfield for more details.
13093 Came here with a `.pushlevel' .
13095 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13096 CHANGES TO CODE IN `grokfield'. */
13099 grokmethod (cp_decl_specifier_seq *declspecs,
13100 const cp_declarator *declarator, tree attrlist)
13102 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13105 if (fndecl == error_mark_node)
13106 return error_mark_node;
13108 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13110 error ("invalid member function declaration");
13111 return error_mark_node;
13115 cplus_decl_attributes (&fndecl, attrlist, 0);
13117 /* Pass friends other than inline friend functions back. */
13118 if (fndecl == void_type_node)
13121 if (DECL_IN_AGGR_P (fndecl))
13123 if (DECL_CLASS_SCOPE_P (fndecl))
13124 error ("%qD is already defined in class %qT", fndecl,
13125 DECL_CONTEXT (fndecl));
13126 return error_mark_node;
13129 check_template_shadow (fndecl);
13131 DECL_DECLARED_INLINE_P (fndecl) = 1;
13132 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13134 /* We process method specializations in finish_struct_1. */
13135 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13137 fndecl = push_template_decl (fndecl);
13138 if (fndecl == error_mark_node)
13142 if (! DECL_FRIEND_P (fndecl))
13144 if (DECL_CHAIN (fndecl))
13146 fndecl = copy_node (fndecl);
13147 TREE_CHAIN (fndecl) = NULL_TREE;
13151 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13153 DECL_IN_AGGR_P (fndecl) = 1;
13158 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13159 we can lay it out later, when and if its type becomes complete. */
13162 maybe_register_incomplete_var (tree var)
13164 gcc_assert (TREE_CODE (var) == VAR_DECL);
13166 /* Keep track of variables with incomplete types. */
13167 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13168 && DECL_EXTERNAL (var))
13170 tree inner_type = TREE_TYPE (var);
13172 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13173 inner_type = TREE_TYPE (inner_type);
13174 inner_type = TYPE_MAIN_VARIANT (inner_type);
13176 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13177 /* RTTI TD entries are created while defining the type_info. */
13178 || (TYPE_LANG_SPECIFIC (inner_type)
13179 && TYPE_BEING_DEFINED (inner_type)))
13182 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13184 iv->incomplete_type = inner_type;
13189 /* Called when a class type (given by TYPE) is defined. If there are
13190 any existing VAR_DECLs whose type has been completed by this
13191 declaration, update them now. */
13194 complete_vars (tree type)
13197 incomplete_var *iv;
13199 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13201 if (same_type_p (type, iv->incomplete_type))
13203 tree var = iv->decl;
13204 tree type = TREE_TYPE (var);
13205 /* Complete the type of the variable. The VAR_DECL itself
13206 will be laid out in expand_expr. */
13207 complete_type (type);
13208 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13209 /* Remove this entry from the list. */
13210 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13216 /* Check for pending declarations which may have abstract type. */
13217 complete_type_check_abstract (type);
13220 /* If DECL is of a type which needs a cleanup, build and return an
13221 expression to perform that cleanup here. Return NULL_TREE if no
13222 cleanup need be done. */
13225 cxx_maybe_build_cleanup (tree decl)
13231 /* Assume no cleanup is required. */
13232 cleanup = NULL_TREE;
13234 if (error_operand_p (decl))
13237 /* Handle "__attribute__((cleanup))". We run the cleanup function
13238 before the destructor since the destructor is what actually
13239 terminates the lifetime of the object. */
13240 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13247 /* Get the name specified by the user for the cleanup function. */
13248 id = TREE_VALUE (TREE_VALUE (attr));
13249 /* Look up the name to find the cleanup function to call. It is
13250 important to use lookup_name here because that is what is
13251 used in c-common.c:handle_cleanup_attribute when performing
13252 initial checks on the attribute. Note that those checks
13253 include ensuring that the function found is not an overloaded
13254 function, or an object with an overloaded call operator,
13255 etc.; we can rely on the fact that the function found is an
13256 ordinary FUNCTION_DECL. */
13257 fn = lookup_name (id);
13258 arg = build_address (decl);
13260 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13263 /* Handle ordinary C++ destructors. */
13264 type = TREE_TYPE (decl);
13265 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13267 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13268 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13269 && CLASSTYPE_VBASECLASSES (type));
13273 if (TREE_CODE (type) == ARRAY_TYPE)
13276 addr = build_address (decl);
13278 /* Optimize for space over speed here. */
13279 if (!has_vbases || flag_expensive_optimizations)
13280 flags |= LOOKUP_NONVIRTUAL;
13282 call = build_delete (TREE_TYPE (addr), addr,
13283 sfk_complete_destructor, flags, 0);
13285 cleanup = build_compound_expr (input_location, cleanup, call);
13293 /* When a stmt has been parsed, this function is called. */
13300 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13301 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13302 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13305 static_fn_type (tree memfntype)
13310 if (TYPE_PTRMEMFUNC_P (memfntype))
13311 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13312 if (POINTER_TYPE_P (memfntype)
13313 || TREE_CODE (memfntype) == FUNCTION_DECL)
13314 memfntype = TREE_TYPE (memfntype);
13315 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13317 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13318 args = TYPE_ARG_TYPES (memfntype);
13319 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13320 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13321 fntype = (cp_build_type_attribute_variant
13322 (fntype, TYPE_ATTRIBUTES (memfntype)));
13323 fntype = (build_exception_variant
13324 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13328 /* DECL was originally constructed as a non-static member function,
13329 but turned out to be static. Update it accordingly. */
13332 revert_static_member_fn (tree decl)
13334 TREE_TYPE (decl) = static_fn_type (decl);
13336 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13337 error ("static member function %q#D declared with type qualifiers", decl);
13339 if (DECL_ARGUMENTS (decl))
13340 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13341 DECL_STATIC_FUNCTION_P (decl) = 1;
13344 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13345 one of the language-independent trees. */
13347 enum cp_tree_node_structure_enum
13348 cp_tree_node_structure (union lang_tree_node * t)
13350 switch (TREE_CODE (&t->generic))
13352 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13353 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13354 case OVERLOAD: return TS_CP_OVERLOAD;
13355 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13356 case PTRMEM_CST: return TS_CP_PTRMEM;
13357 case BASELINK: return TS_CP_BASELINK;
13358 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13359 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13360 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13361 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13362 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13363 default: return TS_CP_GENERIC;
13367 /* Build the void_list_node (void_type_node having been created). */
13369 build_void_list_node (void)
13371 tree t = build_tree_list (NULL_TREE, void_type_node);
13376 cp_missing_noreturn_ok_p (tree decl)
13378 /* A missing noreturn is ok for the `main' function. */
13379 return DECL_MAIN_P (decl);
13382 /* Return the COMDAT group into which DECL should be placed. */
13385 cxx_comdat_group (tree decl)
13389 /* Virtual tables, construction virtual tables, and virtual table
13390 tables all go in a single COMDAT group, named after the primary
13392 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13393 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13394 /* For all other DECLs, the COMDAT group is the mangled name of the
13395 declaration itself. */
13398 while (DECL_THUNK_P (decl))
13400 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13401 into the same section as the target function. In that case
13402 we must return target's name. */
13403 tree target = THUNK_TARGET (decl);
13404 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13405 && DECL_SECTION_NAME (target) != NULL
13406 && DECL_ONE_ONLY (target))
13411 name = DECL_ASSEMBLER_NAME (decl);
13417 #include "gt-cp-decl.h"