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;
9219 /* If this is declaring a typedef name, return a TYPE_DECL. */
9220 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9224 /* Note that the grammar rejects storage classes
9225 in typenames, fields or parameters. */
9226 if (current_lang_name == lang_name_java)
9227 TYPE_FOR_JAVA (type) = 1;
9229 /* This declaration:
9231 typedef void f(int) const;
9233 declares a function type which is not a member of any
9234 particular class, but which is cv-qualified; for
9235 example "f S::*" declares a pointer to a const-qualified
9236 member function of S. We record the cv-qualification in the
9238 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9240 type = apply_memfn_quals (type, memfn_quals);
9242 /* We have now dealt with these qualifiers. */
9243 memfn_quals = TYPE_UNQUALIFIED;
9246 if (decl_context == FIELD)
9247 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9249 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9250 if (id_declarator && declarator->u.id.qualifying_scope) {
9251 error_at (DECL_SOURCE_LOCATION (decl),
9252 "typedef name may not be a nested-name-specifier");
9253 TREE_TYPE (decl) = error_mark_node;
9256 if (decl_context != FIELD)
9258 if (!current_function_decl)
9259 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9260 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9261 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9262 (current_function_decl)))
9263 /* The TYPE_DECL is "abstract" because there will be
9264 clones of this constructor/destructor, and there will
9265 be copies of this TYPE_DECL generated in those
9267 DECL_ABSTRACT (decl) = 1;
9269 else if (constructor_name_p (unqualified_id, current_class_type))
9270 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9271 "as enclosing class",
9274 /* If the user declares "typedef struct {...} foo" then the
9275 struct will have an anonymous name. Fill that name in now.
9276 Nothing can refer to it, so nothing needs know about the name
9278 if (type != error_mark_node
9281 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9282 && TYPE_ANONYMOUS_P (type)
9283 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9287 /* Replace the anonymous name with the real name everywhere. */
9288 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9290 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9291 /* We do not rename the debug info representing the
9292 anonymous tagged type because the standard says in
9293 [dcl.typedef] that the naming applies only for
9294 linkage purposes. */
9295 /*debug_hooks->set_name (t, decl);*/
9296 TYPE_NAME (t) = decl;
9299 if (TYPE_LANG_SPECIFIC (type))
9300 TYPE_WAS_ANONYMOUS (type) = 1;
9302 /* If this is a typedef within a template class, the nested
9303 type is a (non-primary) template. The name for the
9304 template needs updating as well. */
9305 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9306 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9307 = TYPE_IDENTIFIER (type);
9309 /* Adjust linkage now that we aren't anonymous anymore. */
9310 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9311 determine_visibility (TYPE_MAIN_DECL (type));
9313 /* FIXME remangle member functions; member functions of a
9314 type with external linkage have external linkage. */
9318 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9319 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9321 bad_specifiers (decl, BSP_TYPE, virtualp,
9322 memfn_quals != TYPE_UNQUALIFIED,
9323 inlinep, friendp, raises != NULL_TREE);
9328 /* Detect the case of an array type of unspecified size
9329 which came, as such, direct from a typedef name.
9330 We must copy the type, so that the array's domain can be
9331 individually set by the object's initializer. */
9333 if (type && typedef_type
9334 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9335 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9336 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9338 /* Detect where we're using a typedef of function type to declare a
9339 function. PARMS will not be set, so we must create it now. */
9341 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9343 tree decls = NULL_TREE;
9346 for (args = TYPE_ARG_TYPES (type);
9347 args && args != void_list_node;
9348 args = TREE_CHAIN (args))
9350 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9352 DECL_CHAIN (decl) = decls;
9356 parms = nreverse (decls);
9358 if (decl_context != TYPENAME)
9360 /* A cv-qualifier-seq shall only be part of the function type
9361 for a non-static member function. [8.3.5/4 dcl.fct] */
9362 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9363 && (current_class_type == NULL_TREE || staticp) )
9366 ? G_("qualified function types cannot be used to "
9367 "declare static member functions")
9368 : G_("qualified function types cannot be used to "
9369 "declare free functions"));
9370 type = TYPE_MAIN_VARIANT (type);
9373 /* The qualifiers on the function type become the qualifiers on
9374 the non-static member function. */
9375 memfn_quals |= type_memfn_quals (type);
9376 type_quals = TYPE_UNQUALIFIED;
9380 /* If this is a type name (such as, in a cast or sizeof),
9381 compute the type and return it now. */
9383 if (decl_context == TYPENAME)
9385 /* Note that the grammar rejects storage classes
9386 in typenames, fields or parameters. */
9387 if (type_quals != TYPE_UNQUALIFIED)
9388 type_quals = TYPE_UNQUALIFIED;
9390 /* Special case: "friend class foo" looks like a TYPENAME context. */
9393 if (type_quals != TYPE_UNQUALIFIED)
9395 error ("type qualifiers specified for friend class declaration");
9396 type_quals = TYPE_UNQUALIFIED;
9400 error ("%<inline%> specified for friend class declaration");
9406 /* Don't allow friend declaration without a class-key. */
9407 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9408 permerror (input_location, "template parameters cannot be friends");
9409 else if (TREE_CODE (type) == TYPENAME_TYPE)
9410 permerror (input_location, "friend declaration requires class-key, "
9411 "i.e. %<friend class %T::%D%>",
9412 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9414 permerror (input_location, "friend declaration requires class-key, "
9415 "i.e. %<friend %#T%>",
9419 /* Only try to do this stuff if we didn't already give up. */
9420 if (type != integer_type_node)
9422 /* A friendly class? */
9423 if (current_class_type)
9424 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9427 error ("trying to make class %qT a friend of global scope",
9430 type = void_type_node;
9433 else if (memfn_quals)
9435 if (ctype == NULL_TREE
9436 && TREE_CODE (type) == METHOD_TYPE)
9437 ctype = TYPE_METHOD_BASETYPE (type);
9440 type = build_memfn_type (type, ctype, memfn_quals);
9441 /* Core issue #547: need to allow this in template type args. */
9442 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9443 type = apply_memfn_quals (type, memfn_quals);
9445 error ("invalid qualifiers on non-member function type");
9450 else if (unqualified_id == NULL_TREE && decl_context != PARM
9451 && decl_context != CATCHPARM
9452 && TREE_CODE (type) != UNION_TYPE
9455 error ("abstract declarator %qT used as declaration", type);
9456 return error_mark_node;
9459 /* Only functions may be declared using an operator-function-id. */
9461 && IDENTIFIER_OPNAME_P (unqualified_id)
9462 && TREE_CODE (type) != FUNCTION_TYPE
9463 && TREE_CODE (type) != METHOD_TYPE)
9465 error ("declaration of %qD as non-function", unqualified_id);
9466 return error_mark_node;
9469 /* We don't check parameter types here because we can emit a better
9470 error message later. */
9471 if (decl_context != PARM)
9473 type = check_var_type (unqualified_id, type);
9474 if (type == error_mark_node)
9475 return error_mark_node;
9478 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9479 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9481 if (decl_context == PARM || decl_context == CATCHPARM)
9483 if (ctype || in_namespace)
9484 error ("cannot use %<::%> in parameter declaration");
9486 /* A parameter declared as an array of T is really a pointer to T.
9487 One declared as a function is really a pointer to a function.
9488 One declared as a member is really a pointer to member. */
9490 if (TREE_CODE (type) == ARRAY_TYPE)
9492 /* Transfer const-ness of array into that of type pointed to. */
9493 type = build_pointer_type (TREE_TYPE (type));
9494 type_quals = TYPE_UNQUALIFIED;
9496 else if (TREE_CODE (type) == FUNCTION_TYPE)
9497 type = build_pointer_type (type);
9500 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9501 && !NEW_DELETE_OPNAME_P (unqualified_id))
9502 type = build_memfn_type (type, ctype, memfn_quals);
9507 if (decl_context == PARM)
9509 decl = cp_build_parm_decl (unqualified_id, type);
9511 bad_specifiers (decl, BSP_PARM, virtualp,
9512 memfn_quals != TYPE_UNQUALIFIED,
9513 inlinep, friendp, raises != NULL_TREE);
9515 else if (decl_context == FIELD)
9517 /* The C99 flexible array extension. */
9518 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9519 && TYPE_DOMAIN (type) == NULL_TREE)
9521 tree itype = compute_array_index_type (dname, integer_zero_node,
9522 tf_warning_or_error);
9523 type = build_cplus_array_type (TREE_TYPE (type), itype);
9526 if (type == error_mark_node)
9528 /* Happens when declaring arrays of sizes which
9529 are error_mark_node, for example. */
9532 else if (in_namespace && !friendp)
9534 /* Something like struct S { int N::j; }; */
9535 error ("invalid use of %<::%>");
9536 return error_mark_node;
9538 else if (TREE_CODE (type) == FUNCTION_TYPE
9539 || TREE_CODE (type) == METHOD_TYPE)
9542 tree function_context;
9546 /* This should never happen in pure C++ (the check
9547 could be an assert). It could happen in
9548 Objective-C++ if someone writes invalid code that
9549 uses a function declaration for an instance
9550 variable or property (instance variables and
9551 properties are parsed as FIELD_DECLs, but they are
9552 part of an Objective-C class, not a C++ class).
9553 That code is invalid and is caught by this
9557 error ("declaration of function %qD in invalid context",
9559 return error_mark_node;
9562 /* ``A union may [ ... ] not [ have ] virtual functions.''
9564 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9566 error ("function %qD declared virtual inside a union",
9568 return error_mark_node;
9571 if (NEW_DELETE_OPNAME_P (unqualified_id))
9575 error ("%qD cannot be declared virtual, since it "
9583 /* Check that the name used for a destructor makes sense. */
9584 if (sfk == sfk_destructor)
9586 tree uqname = id_declarator->u.id.unqualified_name;
9590 gcc_assert (friendp);
9591 error ("expected qualified name in friend declaration "
9592 "for destructor %qD", uqname);
9593 return error_mark_node;
9596 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9598 error ("declaration of %qD as member of %qT",
9600 return error_mark_node;
9604 error ("a destructor cannot be %<constexpr%>");
9605 return error_mark_node;
9608 else if (sfk == sfk_constructor && friendp && !ctype)
9610 error ("expected qualified name in friend declaration "
9611 "for constructor %qD",
9612 id_declarator->u.id.unqualified_name);
9613 return error_mark_node;
9616 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9617 function_context = (ctype != NULL_TREE) ?
9618 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9619 publicp = (! friendp || ! staticp)
9620 && function_context == NULL_TREE;
9621 decl = grokfndecl (ctype, type,
9622 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9623 ? unqualified_id : dname,
9626 virtualp, flags, memfn_quals, raises,
9627 friendp ? -1 : 0, friendp, publicp,
9628 inlinep | (2 * constexpr_p),
9630 funcdef_flag, template_count, in_namespace,
9631 attrlist, declarator->id_loc);
9632 if (decl == NULL_TREE)
9633 return error_mark_node;
9635 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9636 /* The decl and setting of decl_attr is also turned off. */
9637 decl = build_decl_attribute_variant (decl, decl_attr);
9640 /* [class.conv.ctor]
9642 A constructor declared without the function-specifier
9643 explicit that can be called with a single parameter
9644 specifies a conversion from the type of its first
9645 parameter to the type of its class. Such a constructor
9646 is called a converting constructor. */
9648 DECL_NONCONVERTING_P (decl) = 1;
9650 else if (!staticp && !dependent_type_p (type)
9651 && !COMPLETE_TYPE_P (complete_type (type))
9652 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9655 error ("field %qD has incomplete type", unqualified_id);
9657 error ("name %qT has incomplete type", type);
9659 /* If we're instantiating a template, tell them which
9660 instantiation made the field's type be incomplete. */
9661 if (current_class_type
9662 && TYPE_NAME (current_class_type)
9663 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9665 && declspecs->type == type)
9666 error (" in instantiation of template %qT",
9667 current_class_type);
9669 return error_mark_node;
9675 error ("%qE is neither function nor member function; "
9676 "cannot be declared friend", unqualified_id);
9684 /* Friends are treated specially. */
9685 if (ctype == current_class_type)
9686 ; /* We already issued a permerror. */
9687 else if (decl && DECL_NAME (decl))
9689 if (template_class_depth (current_class_type) == 0)
9691 decl = check_explicit_specialization
9692 (unqualified_id, decl, template_count,
9693 2 * funcdef_flag + 4);
9694 if (decl == error_mark_node)
9695 return error_mark_node;
9698 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9699 decl = do_friend (ctype, unqualified_id, decl,
9705 return error_mark_node;
9708 /* Structure field. It may not be a function, except for C++. */
9710 if (decl == NULL_TREE)
9716 /* An attempt is being made to initialize a non-static
9717 member. But, from [class.mem]:
9719 4 A member-declarator can contain a
9720 constant-initializer only if it declares a static
9721 member (_class.static_) of integral or enumeration
9722 type, see _class.static.data_.
9724 This used to be relatively common practice, but
9725 the rest of the compiler does not correctly
9726 handle the initialization unless the member is
9727 static so we make it static below. */
9728 if (cxx_dialect >= cxx0x)
9730 sorry ("non-static data member initializers");
9734 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9736 permerror (input_location, "making %qD static", unqualified_id);
9741 if (uses_template_parms (type))
9742 /* We'll check at instantiation time. */
9744 else if (constexpr_p)
9745 /* constexpr has the same requirements. */
9747 else if (check_static_variable_definition (unqualified_id,
9749 /* If we just return the declaration, crashes
9750 will sometimes occur. We therefore return
9751 void_type_node, as if this was a friend
9752 declaration, to cause callers to completely
9753 ignore this declaration. */
9754 return error_mark_node;
9759 /* C++ allows static class members. All other work
9760 for this is done by grokfield. */
9761 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9762 set_linkage_for_static_data_member (decl);
9763 /* Even if there is an in-class initialization, DECL
9764 is considered undefined until an out-of-class
9765 definition is provided. */
9766 DECL_EXTERNAL (decl) = 1;
9769 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9771 if (constexpr_p && !initialized)
9773 error ("constexpr static data member %qD must have an "
9774 "initializer", decl);
9775 constexpr_p = false;
9782 error ("non-static data member %qE declared %<constexpr%>",
9784 constexpr_p = false;
9786 decl = build_decl (input_location,
9787 FIELD_DECL, unqualified_id, type);
9788 DECL_NONADDRESSABLE_P (decl) = bitfield;
9789 if (bitfield && !unqualified_id)
9790 TREE_NO_WARNING (decl) = 1;
9792 if (storage_class == sc_mutable)
9794 DECL_MUTABLE_P (decl) = 1;
9795 storage_class = sc_none;
9799 bad_specifiers (decl, BSP_FIELD, virtualp,
9800 memfn_quals != TYPE_UNQUALIFIED,
9801 inlinep, friendp, raises != NULL_TREE);
9804 else if (TREE_CODE (type) == FUNCTION_TYPE
9805 || TREE_CODE (type) == METHOD_TYPE)
9810 if (!unqualified_id)
9811 return error_mark_node;
9813 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9814 original_name = dname;
9816 original_name = unqualified_id;
9818 if (storage_class == sc_auto)
9819 error ("storage class %<auto%> invalid for function %qs", name);
9820 else if (storage_class == sc_register)
9821 error ("storage class %<register%> invalid for function %qs", name);
9823 error ("storage class %<__thread%> invalid for function %qs", name);
9825 /* Function declaration not at top level.
9826 Storage classes other than `extern' are not allowed
9827 and `extern' makes no difference. */
9828 if (! toplevel_bindings_p ()
9829 && (storage_class == sc_static
9830 || declspecs->specs[(int)ds_inline])
9833 if (storage_class == sc_static)
9834 pedwarn (input_location, OPT_pedantic,
9835 "%<static%> specified invalid for function %qs "
9836 "declared out of global scope", name);
9838 pedwarn (input_location, OPT_pedantic,
9839 "%<inline%> specifier invalid for function %qs "
9840 "declared out of global scope", name);
9843 if (ctype != NULL_TREE
9844 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9846 error ("%q#T is not a class or a namespace", ctype);
9850 if (ctype == NULL_TREE)
9854 error ("virtual non-class function %qs", name);
9857 else if (sfk == sfk_constructor
9858 || sfk == sfk_destructor)
9861 ? "%qs defined in a non-class scope"
9862 : "%qs declared in a non-class scope", name);
9867 /* Record presence of `static'. */
9868 publicp = (ctype != NULL_TREE
9869 || storage_class == sc_extern
9870 || storage_class != sc_static);
9872 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9873 virtualp, flags, memfn_quals, raises,
9875 publicp, inlinep | (2 * constexpr_p), sfk,
9877 template_count, in_namespace, attrlist,
9878 declarator->id_loc);
9879 if (decl == NULL_TREE)
9880 return error_mark_node;
9884 int invalid_static = 0;
9886 /* Don't allow a static member function in a class, and forbid
9887 declaring main to be static. */
9888 if (TREE_CODE (type) == METHOD_TYPE)
9890 permerror (input_location, "cannot declare member function %qD to have "
9891 "static linkage", decl);
9894 else if (current_function_decl)
9896 /* FIXME need arm citation */
9897 error ("cannot declare static function inside another function");
9904 storage_class = sc_none;
9910 /* It's a variable. */
9912 /* An uninitialized decl with `extern' is a reference. */
9913 decl = grokvardecl (type, unqualified_id,
9916 (type_quals & TYPE_QUAL_CONST) != 0,
9917 ctype ? ctype : in_namespace);
9918 bad_specifiers (decl, BSP_VAR, virtualp,
9919 memfn_quals != TYPE_UNQUALIFIED,
9920 inlinep, friendp, raises != NULL_TREE);
9924 DECL_CONTEXT (decl) = ctype;
9927 permerror (input_location, "%<static%> may not be used when defining "
9928 "(as opposed to declaring) a static data member");
9930 storage_class = sc_none;
9932 if (storage_class == sc_register && TREE_STATIC (decl))
9934 error ("static member %qD declared %<register%>", decl);
9935 storage_class = sc_none;
9937 if (storage_class == sc_extern && pedantic)
9939 pedwarn (input_location, OPT_pedantic,
9940 "cannot explicitly declare member %q#D to have "
9941 "extern linkage", decl);
9942 storage_class = sc_none;
9945 else if (constexpr_p && DECL_EXTERNAL (decl))
9946 error ("declaration of constexpr variable %qD is not a definition",
9950 if (storage_class == sc_extern && initialized && !funcdef_flag)
9952 if (toplevel_bindings_p ())
9954 /* It's common practice (and completely valid) to have a const
9955 be initialized and declared extern. */
9956 if (!(type_quals & TYPE_QUAL_CONST))
9957 warning (0, "%qs initialized and declared %<extern%>", name);
9961 error ("%qs has both %<extern%> and initializer", name);
9962 return error_mark_node;
9966 /* Record `register' declaration for warnings on &
9967 and in case doing stupid register allocation. */
9969 if (storage_class == sc_register)
9970 DECL_REGISTER (decl) = 1;
9971 else if (storage_class == sc_extern)
9972 DECL_THIS_EXTERN (decl) = 1;
9973 else if (storage_class == sc_static)
9974 DECL_THIS_STATIC (decl) = 1;
9976 /* Don't forget constexprness. */
9978 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9980 /* Record constancy and volatility on the DECL itself . There's
9981 no need to do this when processing a template; we'll do this
9982 for the instantiated declaration based on the type of DECL. */
9983 if (!processing_template_decl)
9984 cp_apply_type_quals_to_decl (type_quals, decl);
9990 /* Subroutine of start_function. Ensure that each of the parameter
9991 types (as listed in PARMS) is complete, as is required for a
9992 function definition. */
9995 require_complete_types_for_parms (tree parms)
9997 for (; parms; parms = DECL_CHAIN (parms))
9999 if (dependent_type_p (TREE_TYPE (parms)))
10001 if (!VOID_TYPE_P (TREE_TYPE (parms))
10002 && complete_type_or_else (TREE_TYPE (parms), parms))
10004 relayout_decl (parms);
10005 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10008 /* grokparms or complete_type_or_else will have already issued
10010 TREE_TYPE (parms) = error_mark_node;
10014 /* Returns nonzero if T is a local variable. */
10017 local_variable_p (const_tree t)
10019 if ((TREE_CODE (t) == VAR_DECL
10020 /* A VAR_DECL with a context that is a _TYPE is a static data
10022 && !TYPE_P (CP_DECL_CONTEXT (t))
10023 /* Any other non-local variable must be at namespace scope. */
10024 && !DECL_NAMESPACE_SCOPE_P (t))
10025 || (TREE_CODE (t) == PARM_DECL))
10031 /* Like local_variable_p, but suitable for use as a tree-walking
10035 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10036 void *data ATTRIBUTE_UNUSED)
10038 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10040 else if (TYPE_P (*tp))
10041 *walk_subtrees = 0;
10047 /* Check that ARG, which is a default-argument expression for a
10048 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10049 something goes wrong. DECL may also be a _TYPE node, rather than a
10050 DECL, if there is no DECL available. */
10053 check_default_argument (tree decl, tree arg)
10058 if (TREE_CODE (arg) == DEFAULT_ARG)
10059 /* We get a DEFAULT_ARG when looking at an in-class declaration
10060 with a default argument. Ignore the argument for now; we'll
10061 deal with it after the class is complete. */
10070 decl_type = TREE_TYPE (decl);
10072 if (arg == error_mark_node
10073 || decl == error_mark_node
10074 || TREE_TYPE (arg) == error_mark_node
10075 || decl_type == error_mark_node)
10076 /* Something already went wrong. There's no need to check
10078 return error_mark_node;
10080 /* [dcl.fct.default]
10082 A default argument expression is implicitly converted to the
10084 if (!TREE_TYPE (arg)
10085 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10088 error ("default argument for %q#D has type %qT",
10089 decl, TREE_TYPE (arg));
10091 error ("default argument for parameter of type %qT has type %qT",
10092 decl_type, TREE_TYPE (arg));
10094 return error_mark_node;
10097 /* [dcl.fct.default]
10099 Local variables shall not be used in default argument
10102 The keyword `this' shall not be used in a default argument of a
10103 member function. */
10104 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10107 error ("default argument %qE uses local variable %qD", arg, var);
10108 return error_mark_node;
10115 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10118 type_is_deprecated (tree type)
10120 enum tree_code code;
10121 if (TREE_DEPRECATED (type))
10123 if (TYPE_NAME (type)
10124 && TREE_DEPRECATED (TYPE_NAME (type)))
10127 /* Do warn about using typedefs to a deprecated class. */
10128 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10129 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10131 code = TREE_CODE (type);
10133 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10134 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10135 || code == METHOD_TYPE || code == ARRAY_TYPE)
10136 return type_is_deprecated (TREE_TYPE (type));
10138 if (TYPE_PTRMEMFUNC_P (type))
10139 return type_is_deprecated
10140 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10145 /* Decode the list of parameter types for a function type.
10146 Given the list of things declared inside the parens,
10147 return a list of types.
10149 If this parameter does not end with an ellipsis, we append
10152 *PARMS is set to the chain of PARM_DECLs created. */
10155 grokparms (tree parmlist, tree *parms)
10157 tree result = NULL_TREE;
10158 tree decls = NULL_TREE;
10162 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10164 tree type = NULL_TREE;
10165 tree init = TREE_PURPOSE (parm);
10166 tree decl = TREE_VALUE (parm);
10167 const char *errmsg;
10169 if (parm == void_list_node)
10172 if (! decl || TREE_TYPE (decl) == error_mark_node)
10175 type = TREE_TYPE (decl);
10176 if (VOID_TYPE_P (type))
10178 if (same_type_p (type, void_type_node)
10179 && DECL_SELF_REFERENCE_P (type)
10180 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10181 /* this is a parmlist of `(void)', which is ok. */
10183 cxx_incomplete_type_error (decl, type);
10184 /* It's not a good idea to actually create parameters of
10185 type `void'; other parts of the compiler assume that a
10186 void type terminates the parameter list. */
10187 type = error_mark_node;
10188 TREE_TYPE (decl) = error_mark_node;
10191 if (type != error_mark_node
10192 && TYPE_FOR_JAVA (type)
10193 && MAYBE_CLASS_TYPE_P (type))
10195 error ("parameter %qD has Java class type", decl);
10196 type = error_mark_node;
10197 TREE_TYPE (decl) = error_mark_node;
10201 if (type != error_mark_node
10202 && (errmsg = targetm.invalid_parameter_type (type)))
10205 type = error_mark_node;
10206 TREE_TYPE (decl) = error_mark_node;
10209 if (type != error_mark_node)
10211 if (deprecated_state != DEPRECATED_SUPPRESS)
10213 tree deptype = type_is_deprecated (type);
10215 warn_deprecated_use (deptype, NULL_TREE);
10218 /* Top-level qualifiers on the parameters are
10219 ignored for function types. */
10220 type = cp_build_qualified_type (type, 0);
10221 if (TREE_CODE (type) == METHOD_TYPE)
10223 error ("parameter %qD invalidly declared method type", decl);
10224 type = build_pointer_type (type);
10225 TREE_TYPE (decl) = type;
10227 else if (abstract_virtuals_error (decl, type))
10228 any_error = 1; /* Seems like a good idea. */
10229 else if (POINTER_TYPE_P (type))
10231 /* [dcl.fct]/6, parameter types cannot contain pointers
10232 (references) to arrays of unknown bound. */
10233 tree t = TREE_TYPE (type);
10234 int ptr = TYPE_PTR_P (type);
10238 if (TYPE_PTR_P (t))
10240 else if (TREE_CODE (t) != ARRAY_TYPE)
10242 else if (!TYPE_DOMAIN (t))
10246 if (TREE_CODE (t) == ARRAY_TYPE)
10248 ? G_("parameter %qD includes pointer to array of "
10249 "unknown bound %qT")
10250 : G_("parameter %qD includes reference to array of "
10251 "unknown bound %qT"),
10257 else if (init && !processing_template_decl)
10258 init = check_default_argument (decl, init);
10261 if (TREE_CODE (decl) == PARM_DECL
10262 && FUNCTION_PARAMETER_PACK_P (decl)
10263 && TREE_CHAIN (parm)
10264 && TREE_CHAIN (parm) != void_list_node)
10265 error ("parameter packs must be at the end of the parameter list");
10267 DECL_CHAIN (decl) = decls;
10269 result = tree_cons (init, type, result);
10271 decls = nreverse (decls);
10272 result = nreverse (result);
10274 result = chainon (result, void_list_node);
10281 /* D is a constructor or overloaded `operator='.
10283 Let T be the class in which D is declared. Then, this function
10286 -1 if D's is an ill-formed constructor or copy assignment operator
10287 whose first parameter is of type `T'.
10288 0 if D is not a copy constructor or copy assignment
10290 1 if D is a copy constructor or copy assignment operator whose
10291 first parameter is a reference to non-const qualified T.
10292 2 if D is a copy constructor or copy assignment operator whose
10293 first parameter is a reference to const qualified T.
10295 This function can be used as a predicate. Positive values indicate
10296 a copy constructor and nonzero values indicate a copy assignment
10300 copy_fn_p (const_tree d)
10306 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10308 if (TREE_CODE (d) == TEMPLATE_DECL
10309 || (DECL_TEMPLATE_INFO (d)
10310 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10311 /* Instantiations of template member functions are never copy
10312 functions. Note that member functions of templated classes are
10313 represented as template functions internally, and we must
10314 accept those as copy functions. */
10317 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10321 arg_type = TREE_VALUE (args);
10322 if (arg_type == error_mark_node)
10325 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10327 /* Pass by value copy assignment operator. */
10330 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10331 && !TYPE_REF_IS_RVALUE (arg_type)
10332 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10334 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10340 args = TREE_CHAIN (args);
10342 if (args && args != void_list_node && !TREE_PURPOSE (args))
10343 /* There are more non-optional args. */
10349 /* D is a constructor or overloaded `operator='.
10351 Let T be the class in which D is declared. Then, this function
10352 returns true when D is a move constructor or move assignment
10353 operator, false otherwise. */
10356 move_fn_p (const_tree d)
10360 bool result = false;
10362 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10364 if (cxx_dialect == cxx98)
10365 /* There are no move constructors if we are in C++98 mode. */
10368 if (TREE_CODE (d) == TEMPLATE_DECL
10369 || (DECL_TEMPLATE_INFO (d)
10370 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10371 /* Instantiations of template member functions are never copy
10372 functions. Note that member functions of templated classes are
10373 represented as template functions internally, and we must
10374 accept those as copy functions. */
10377 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10381 arg_type = TREE_VALUE (args);
10382 if (arg_type == error_mark_node)
10385 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10386 && TYPE_REF_IS_RVALUE (arg_type)
10387 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10391 args = TREE_CHAIN (args);
10393 if (args && args != void_list_node && !TREE_PURPOSE (args))
10394 /* There are more non-optional args. */
10400 /* Remember any special properties of member function DECL. */
10403 grok_special_member_properties (tree decl)
10407 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10410 class_type = DECL_CONTEXT (decl);
10411 if (DECL_CONSTRUCTOR_P (decl))
10413 int ctor = copy_fn_p (decl);
10415 if (!DECL_ARTIFICIAL (decl))
10416 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10422 A non-template constructor for class X is a copy
10423 constructor if its first parameter is of type X&, const
10424 X&, volatile X& or const volatile X&, and either there
10425 are no other parameters or else all other parameters have
10426 default arguments. */
10427 TYPE_HAS_COPY_CTOR (class_type) = 1;
10428 if (user_provided_p (decl))
10429 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10431 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10433 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10435 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10436 if (user_provided_p (decl))
10437 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10439 else if (move_fn_p (decl) && user_provided_p (decl))
10440 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10441 else if (is_list_ctor (decl))
10442 TYPE_HAS_LIST_CTOR (class_type) = 1;
10444 if (DECL_DECLARED_CONSTEXPR_P (decl)
10445 && !copy_fn_p (decl) && !move_fn_p (decl))
10446 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10448 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10452 A non-template assignment operator for class X is a copy
10453 assignment operator if its parameter is of type X, X&, const
10454 X&, volatile X& or const volatile X&. */
10456 int assop = copy_fn_p (decl);
10460 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10461 if (user_provided_p (decl))
10462 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10464 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10466 else if (move_fn_p (decl) && user_provided_p (decl))
10467 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10469 /* Destructors are handled in check_methods. */
10472 /* Check a constructor DECL has the correct form. Complains
10473 if the class has a constructor of the form X(X). */
10476 grok_ctor_properties (const_tree ctype, const_tree decl)
10478 int ctor_parm = copy_fn_p (decl);
10484 A declaration of a constructor for a class X is ill-formed if
10485 its first parameter is of type (optionally cv-qualified) X
10486 and either there are no other parameters or else all other
10487 parameters have default arguments.
10489 We *don't* complain about member template instantiations that
10490 have this form, though; they can occur as we try to decide
10491 what constructor to use during overload resolution. Since
10492 overload resolution will never prefer such a constructor to
10493 the non-template copy constructor (which is either explicitly
10494 or implicitly defined), there's no need to worry about their
10495 existence. Theoretically, they should never even be
10496 instantiated, but that's hard to forestall. */
10497 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10505 /* An operator with this code is unary, but can also be binary. */
10508 ambi_op_p (enum tree_code code)
10510 return (code == INDIRECT_REF
10511 || code == ADDR_EXPR
10512 || code == UNARY_PLUS_EXPR
10513 || code == NEGATE_EXPR
10514 || code == PREINCREMENT_EXPR
10515 || code == PREDECREMENT_EXPR);
10518 /* An operator with this name can only be unary. */
10521 unary_op_p (enum tree_code code)
10523 return (code == TRUTH_NOT_EXPR
10524 || code == BIT_NOT_EXPR
10525 || code == COMPONENT_REF
10526 || code == TYPE_EXPR);
10529 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10530 errors are issued for invalid declarations. */
10533 grok_op_properties (tree decl, bool complain)
10535 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10537 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10538 tree name = DECL_NAME (decl);
10539 enum tree_code operator_code;
10544 /* Count the number of arguments and check for ellipsis. */
10545 for (argtype = argtypes, arity = 0;
10546 argtype && argtype != void_list_node;
10547 argtype = TREE_CHAIN (argtype))
10549 ellipsis_p = !argtype;
10551 class_type = DECL_CONTEXT (decl);
10552 if (class_type && !CLASS_TYPE_P (class_type))
10553 class_type = NULL_TREE;
10555 if (DECL_CONV_FN_P (decl))
10556 operator_code = TYPE_EXPR;
10560 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10561 if (ansi_opname (CODE) == name) \
10563 operator_code = (CODE); \
10566 else if (ansi_assopname (CODE) == name) \
10568 operator_code = (CODE); \
10569 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10573 #include "operators.def"
10574 #undef DEF_OPERATOR
10576 gcc_unreachable ();
10579 gcc_assert (operator_code != MAX_TREE_CODES);
10580 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10583 switch (operator_code)
10586 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10590 TYPE_GETS_DELETE (class_type) |= 1;
10594 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10597 case VEC_DELETE_EXPR:
10598 TYPE_GETS_DELETE (class_type) |= 2;
10605 /* [basic.std.dynamic.allocation]/1:
10607 A program is ill-formed if an allocation function is declared
10608 in a namespace scope other than global scope or declared static
10611 The same also holds true for deallocation functions. */
10612 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10613 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10615 if (DECL_NAMESPACE_SCOPE_P (decl))
10617 if (CP_DECL_CONTEXT (decl) != global_namespace)
10619 error ("%qD may not be declared within a namespace", decl);
10622 else if (!TREE_PUBLIC (decl))
10624 error ("%qD may not be declared as static", decl);
10630 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10632 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10633 DECL_IS_OPERATOR_NEW (decl) = 1;
10635 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10636 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10639 /* An operator function must either be a non-static member function
10640 or have at least one parameter of a class, a reference to a class,
10641 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10642 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10644 if (operator_code == TYPE_EXPR
10645 || operator_code == CALL_EXPR
10646 || operator_code == COMPONENT_REF
10647 || operator_code == ARRAY_REF
10648 || operator_code == NOP_EXPR)
10650 error ("%qD must be a nonstatic member function", decl);
10657 if (DECL_STATIC_FUNCTION_P (decl))
10659 error ("%qD must be either a non-static member "
10660 "function or a non-member function", decl);
10664 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10666 tree arg = non_reference (TREE_VALUE (p));
10667 if (arg == error_mark_node)
10670 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10671 because these checks are performed even on
10672 template functions. */
10673 if (MAYBE_CLASS_TYPE_P (arg)
10674 || TREE_CODE (arg) == ENUMERAL_TYPE)
10678 if (!p || p == void_list_node)
10681 error ("%qD must have an argument of class or "
10682 "enumerated type", decl);
10688 /* There are no restrictions on the arguments to an overloaded
10690 if (operator_code == CALL_EXPR)
10693 /* Warn about conversion operators that will never be used. */
10694 if (IDENTIFIER_TYPENAME_P (name)
10695 && ! DECL_TEMPLATE_INFO (decl)
10697 /* Warn only declaring the function; there is no need to
10698 warn again about out-of-class definitions. */
10699 && class_type == current_class_type)
10701 tree t = TREE_TYPE (name);
10702 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10705 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10707 if (TREE_CODE (t) == VOID_TYPE)
10708 warning (OPT_Wconversion,
10710 ? G_("conversion to a reference to void "
10711 "will never use a type conversion operator")
10712 : G_("conversion to void "
10713 "will never use a type conversion operator"));
10714 else if (class_type)
10716 if (t == class_type)
10717 warning (OPT_Wconversion,
10719 ? G_("conversion to a reference to the same type "
10720 "will never use a type conversion operator")
10721 : G_("conversion to the same type "
10722 "will never use a type conversion operator"));
10723 /* Don't force t to be complete here. */
10724 else if (MAYBE_CLASS_TYPE_P (t)
10725 && COMPLETE_TYPE_P (t)
10726 && DERIVED_FROM_P (t, class_type))
10727 warning (OPT_Wconversion,
10729 ? G_("conversion to a reference to a base class "
10730 "will never use a type conversion operator")
10731 : G_("conversion to a base class "
10732 "will never use a type conversion operator"));
10737 if (operator_code == COND_EXPR)
10740 error ("ISO C++ prohibits overloading operator ?:");
10743 else if (ellipsis_p)
10745 error ("%qD must not have variable number of arguments", decl);
10748 else if (ambi_op_p (operator_code))
10751 /* We pick the one-argument operator codes by default, so
10752 we don't have to change anything. */
10754 else if (arity == 2)
10756 /* If we thought this was a unary operator, we now know
10757 it to be a binary operator. */
10758 switch (operator_code)
10761 operator_code = MULT_EXPR;
10765 operator_code = BIT_AND_EXPR;
10768 case UNARY_PLUS_EXPR:
10769 operator_code = PLUS_EXPR;
10773 operator_code = MINUS_EXPR;
10776 case PREINCREMENT_EXPR:
10777 operator_code = POSTINCREMENT_EXPR;
10780 case PREDECREMENT_EXPR:
10781 operator_code = POSTDECREMENT_EXPR;
10785 gcc_unreachable ();
10788 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10790 if ((operator_code == POSTINCREMENT_EXPR
10791 || operator_code == POSTDECREMENT_EXPR)
10792 && ! processing_template_decl
10793 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10796 error ("postfix %qD must take %<int%> as its argument",
10799 error ("postfix %qD must take %<int%> as its second "
10807 error ("%qD must take either zero or one argument", decl);
10809 error ("%qD must take either one or two arguments", decl);
10813 /* More Effective C++ rule 6. */
10815 && (operator_code == POSTINCREMENT_EXPR
10816 || operator_code == POSTDECREMENT_EXPR
10817 || operator_code == PREINCREMENT_EXPR
10818 || operator_code == PREDECREMENT_EXPR))
10820 tree arg = TREE_VALUE (argtypes);
10821 tree ret = TREE_TYPE (TREE_TYPE (decl));
10822 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10823 arg = TREE_TYPE (arg);
10824 arg = TYPE_MAIN_VARIANT (arg);
10825 if (operator_code == PREINCREMENT_EXPR
10826 || operator_code == PREDECREMENT_EXPR)
10828 if (TREE_CODE (ret) != REFERENCE_TYPE
10829 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10831 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10832 build_reference_type (arg));
10836 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10837 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10841 else if (unary_op_p (operator_code))
10846 error ("%qD must take %<void%>", decl);
10848 error ("%qD must take exactly one argument", decl);
10852 else /* if (binary_op_p (operator_code)) */
10857 error ("%qD must take exactly one argument", decl);
10859 error ("%qD must take exactly two arguments", decl);
10863 /* More Effective C++ rule 7. */
10865 && (operator_code == TRUTH_ANDIF_EXPR
10866 || operator_code == TRUTH_ORIF_EXPR
10867 || operator_code == COMPOUND_EXPR))
10868 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10872 /* Effective C++ rule 23. */
10875 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10876 && (operator_code == PLUS_EXPR
10877 || operator_code == MINUS_EXPR
10878 || operator_code == TRUNC_DIV_EXPR
10879 || operator_code == MULT_EXPR
10880 || operator_code == TRUNC_MOD_EXPR)
10881 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10882 warning (OPT_Weffc__, "%qD should return by value", decl);
10884 /* [over.oper]/8 */
10885 for (; argtypes && argtypes != void_list_node;
10886 argtypes = TREE_CHAIN (argtypes))
10887 if (TREE_PURPOSE (argtypes))
10889 TREE_PURPOSE (argtypes) = NULL_TREE;
10890 if (operator_code == POSTINCREMENT_EXPR
10891 || operator_code == POSTDECREMENT_EXPR)
10893 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10898 error ("%qD cannot have default arguments", decl);
10906 /* Return a string giving the keyword associate with CODE. */
10908 static const char *
10909 tag_name (enum tag_types code)
10921 case typename_type:
10924 gcc_unreachable ();
10928 /* Name lookup in an elaborated-type-specifier (after the keyword
10929 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10930 elaborated-type-specifier is invalid, issue a diagnostic and return
10931 error_mark_node; otherwise, return the *_TYPE to which it referred.
10932 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10935 check_elaborated_type_specifier (enum tag_types tag_code,
10937 bool allow_template_p)
10943 struct S { struct S *p; };
10945 name lookup will find the TYPE_DECL for the implicit "S::S"
10946 typedef. Adjust for that here. */
10947 if (DECL_SELF_REFERENCE_P (decl))
10948 decl = TYPE_NAME (TREE_TYPE (decl));
10950 type = TREE_TYPE (decl);
10952 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10953 is false for this case as well. */
10954 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10956 error ("using template type parameter %qT after %qs",
10957 type, tag_name (tag_code));
10958 return error_mark_node;
10962 If the identifier resolves to a typedef-name or a template
10963 type-parameter, the elaborated-type-specifier is ill-formed.
10965 In other words, the only legitimate declaration to use in the
10966 elaborated type specifier is the implicit typedef created when
10967 the type is declared. */
10968 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10969 && !DECL_SELF_REFERENCE_P (decl)
10970 && tag_code != typename_type)
10972 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10973 error ("%q+D has a previous declaration here", decl);
10974 return error_mark_node;
10976 else if (TREE_CODE (type) != RECORD_TYPE
10977 && TREE_CODE (type) != UNION_TYPE
10978 && tag_code != enum_type
10979 && tag_code != typename_type)
10981 error ("%qT referred to as %qs", type, tag_name (tag_code));
10982 error ("%q+T has a previous declaration here", type);
10983 return error_mark_node;
10985 else if (TREE_CODE (type) != ENUMERAL_TYPE
10986 && tag_code == enum_type)
10988 error ("%qT referred to as enum", type);
10989 error ("%q+T has a previous declaration here", type);
10990 return error_mark_node;
10992 else if (!allow_template_p
10993 && TREE_CODE (type) == RECORD_TYPE
10994 && CLASSTYPE_IS_TEMPLATE (type))
10996 /* If a class template appears as elaborated type specifier
10997 without a template header such as:
10999 template <class T> class C {};
11000 void f(class C); // No template header here
11002 then the required template argument is missing. */
11003 error ("template argument required for %<%s %T%>",
11004 tag_name (tag_code),
11005 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11006 return error_mark_node;
11012 /* Lookup NAME in elaborate type specifier in scope according to
11013 SCOPE and issue diagnostics if necessary.
11014 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11015 found, and ERROR_MARK_NODE for type error. */
11018 lookup_and_check_tag (enum tag_types tag_code, tree name,
11019 tag_scope scope, bool template_header_p)
11023 if (scope == ts_global)
11025 /* First try ordinary name lookup, ignoring hidden class name
11026 injected via friend declaration. */
11027 decl = lookup_name_prefer_type (name, 2);
11028 /* If that fails, the name will be placed in the smallest
11029 non-class, non-function-prototype scope according to 3.3.1/5.
11030 We may already have a hidden name declared as friend in this
11031 scope. So lookup again but not ignoring hidden names.
11032 If we find one, that name will be made visible rather than
11033 creating a new tag. */
11035 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11038 decl = lookup_type_scope (name, scope);
11040 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11041 decl = DECL_TEMPLATE_RESULT (decl);
11043 if (decl && TREE_CODE (decl) == TYPE_DECL)
11045 /* Look for invalid nested type:
11049 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11051 error ("%qD has the same name as the class in which it is "
11054 return error_mark_node;
11057 /* Two cases we need to consider when deciding if a class
11058 template is allowed as an elaborated type specifier:
11059 1. It is a self reference to its own class.
11060 2. It comes with a template header.
11064 template <class T> class C {
11065 class C *c1; // DECL_SELF_REFERENCE_P is true
11068 template <class U> class C; // template_header_p is true
11069 template <class T> class C<T>::D {
11070 class C *c2; // DECL_SELF_REFERENCE_P is true
11073 t = check_elaborated_type_specifier (tag_code,
11076 | DECL_SELF_REFERENCE_P (decl));
11079 else if (decl && TREE_CODE (decl) == TREE_LIST)
11081 error ("reference to %qD is ambiguous", name);
11082 print_candidates (decl);
11083 return error_mark_node;
11089 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11090 Define the tag as a forward-reference if it is not defined.
11092 If a declaration is given, process it here, and report an error if
11093 multiple declarations are not identical.
11095 SCOPE is TS_CURRENT when this is also a definition. Only look in
11096 the current frame for the name (since C++ allows new names in any
11097 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11098 declaration. Only look beginning from the current scope outward up
11099 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11101 TEMPLATE_HEADER_P is true when this declaration is preceded by
11102 a set of template parameters. */
11105 xref_tag (enum tag_types tag_code, tree name,
11106 tag_scope scope, bool template_header_p)
11108 enum tree_code code;
11110 tree context = NULL_TREE;
11112 timevar_push (TV_NAME_LOOKUP);
11114 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11120 code = RECORD_TYPE;
11126 code = ENUMERAL_TYPE;
11129 gcc_unreachable ();
11132 /* In case of anonymous name, xref_tag is only called to
11133 make type node and push name. Name lookup is not required. */
11134 if (ANON_AGGRNAME_P (name))
11137 t = lookup_and_check_tag (tag_code, name,
11138 scope, template_header_p);
11140 if (t == error_mark_node)
11141 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11143 if (scope != ts_current && t && current_class_type
11144 && template_class_depth (current_class_type)
11145 && template_header_p)
11147 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11148 definition of this tag. Since, in addition, we are currently
11149 processing a (member) template declaration of a template
11150 class, we must be very careful; consider:
11157 { template <class V>
11158 friend struct S1; };
11160 Here, the S2::S1 declaration should not be confused with the
11161 outer declaration. In particular, the inner version should
11162 have a template parameter of level 2, not level 1. This
11163 would be particularly important if the member declaration
11166 template <class V = U> friend struct S1;
11168 say, when we should tsubst into `U' when instantiating
11169 S2. On the other hand, when presented with:
11179 we must find the inner binding eventually. We
11180 accomplish this by making sure that the new type we
11181 create to represent this declaration has the right
11183 context = TYPE_CONTEXT (t);
11189 /* If no such tag is yet defined, create a forward-reference node
11190 and record it as the "definition".
11191 When a real declaration of this type is found,
11192 the forward-reference will be altered into a real type. */
11193 if (code == ENUMERAL_TYPE)
11195 error ("use of enum %q#D without previous declaration", name);
11196 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11200 t = make_class_type (code);
11201 TYPE_CONTEXT (t) = context;
11202 t = pushtag (name, t, scope);
11207 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11209 if (!redeclare_class_template (t, current_template_parms))
11210 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11212 else if (!processing_template_decl
11213 && CLASS_TYPE_P (t)
11214 && CLASSTYPE_IS_TEMPLATE (t))
11216 error ("redeclaration of %qT as a non-template", t);
11217 error ("previous declaration %q+D", t);
11218 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11221 /* Make injected friend class visible. */
11222 if (scope != ts_within_enclosing_non_class
11223 && hidden_name_p (TYPE_NAME (t)))
11225 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11226 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11228 if (TYPE_TEMPLATE_INFO (t))
11230 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11231 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11236 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11240 xref_tag_from_type (tree old, tree id, tag_scope scope)
11242 enum tag_types tag_kind;
11244 if (TREE_CODE (old) == RECORD_TYPE)
11245 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11247 tag_kind = union_type;
11249 if (id == NULL_TREE)
11250 id = TYPE_IDENTIFIER (old);
11252 return xref_tag (tag_kind, id, scope, false);
11255 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11256 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11257 access_* node, and the TREE_VALUE is the type of the base-class.
11258 Non-NULL TREE_TYPE indicates virtual inheritance.
11260 Returns true if the binfo hierarchy was successfully created,
11261 false if an error was detected. */
11264 xref_basetypes (tree ref, tree base_list)
11267 tree binfo, base_binfo;
11268 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11269 unsigned max_bases = 0; /* Maximum direct bases. */
11271 tree default_access;
11272 tree igo_prev; /* Track Inheritance Graph Order. */
11274 if (ref == error_mark_node)
11277 /* The base of a derived class is private by default, all others are
11279 default_access = (TREE_CODE (ref) == RECORD_TYPE
11280 && CLASSTYPE_DECLARED_CLASS (ref)
11281 ? access_private_node : access_public_node);
11283 /* First, make sure that any templates in base-classes are
11284 instantiated. This ensures that if we call ourselves recursively
11285 we do not get confused about which classes are marked and which
11287 basep = &base_list;
11290 tree basetype = TREE_VALUE (*basep);
11292 if (!(processing_template_decl && uses_template_parms (basetype))
11293 && !complete_type_or_else (basetype, NULL))
11294 /* An incomplete type. Remove it from the list. */
11295 *basep = TREE_CHAIN (*basep);
11299 if (TREE_TYPE (*basep))
11301 if (CLASS_TYPE_P (basetype))
11302 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11303 basep = &TREE_CHAIN (*basep);
11307 TYPE_MARKED_P (ref) = 1;
11309 /* The binfo slot should be empty, unless this is an (ill-formed)
11311 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11313 error ("redefinition of %q#T", ref);
11317 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11319 binfo = make_tree_binfo (max_bases);
11321 TYPE_BINFO (ref) = binfo;
11322 BINFO_OFFSET (binfo) = size_zero_node;
11323 BINFO_TYPE (binfo) = ref;
11325 /* Apply base-class info set up to the variants of this type. */
11326 fixup_type_variants (ref);
11330 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11331 /* An aggregate cannot have baseclasses. */
11332 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11334 if (TREE_CODE (ref) == UNION_TYPE)
11336 error ("derived union %qT invalid", ref);
11343 if (TYPE_FOR_JAVA (ref))
11345 error ("Java class %qT cannot have multiple bases", ref);
11352 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11354 if (TYPE_FOR_JAVA (ref))
11356 error ("Java class %qT cannot have virtual bases", ref);
11361 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11363 tree access = TREE_PURPOSE (base_list);
11364 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11365 tree basetype = TREE_VALUE (base_list);
11367 if (access == access_default_node)
11368 access = default_access;
11370 if (PACK_EXPANSION_P (basetype))
11371 basetype = PACK_EXPANSION_PATTERN (basetype);
11372 if (TREE_CODE (basetype) == TYPE_DECL)
11373 basetype = TREE_TYPE (basetype);
11374 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11376 error ("base type %qT fails to be a struct or class type",
11381 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11382 TYPE_FOR_JAVA (ref) = 1;
11384 base_binfo = NULL_TREE;
11385 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11387 base_binfo = TYPE_BINFO (basetype);
11388 /* The original basetype could have been a typedef'd type. */
11389 basetype = BINFO_TYPE (base_binfo);
11391 /* Inherit flags from the base. */
11392 TYPE_HAS_NEW_OPERATOR (ref)
11393 |= TYPE_HAS_NEW_OPERATOR (basetype);
11394 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11395 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11396 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11397 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11398 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11399 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11400 CLASSTYPE_REPEATED_BASE_P (ref)
11401 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11404 /* We must do this test after we've seen through a typedef
11406 if (TYPE_MARKED_P (basetype))
11408 if (basetype == ref)
11409 error ("recursive type %qT undefined", basetype);
11411 error ("duplicate base type %qT invalid", basetype);
11415 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11416 /* Regenerate the pack expansion for the bases. */
11417 basetype = make_pack_expansion (basetype);
11419 TYPE_MARKED_P (basetype) = 1;
11421 base_binfo = copy_binfo (base_binfo, basetype, ref,
11422 &igo_prev, via_virtual);
11423 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11424 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11426 BINFO_BASE_APPEND (binfo, base_binfo);
11427 BINFO_BASE_ACCESS_APPEND (binfo, access);
11430 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11431 /* If we have space in the vbase vector, we must have shared at
11432 least one of them, and are therefore diamond shaped. */
11433 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11435 /* Unmark all the types. */
11436 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11437 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11438 TYPE_MARKED_P (ref) = 0;
11440 /* Now see if we have a repeated base type. */
11441 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11443 for (base_binfo = binfo; base_binfo;
11444 base_binfo = TREE_CHAIN (base_binfo))
11446 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11448 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11451 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11453 for (base_binfo = binfo; base_binfo;
11454 base_binfo = TREE_CHAIN (base_binfo))
11455 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11456 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11465 /* Copies the enum-related properties from type SRC to type DST.
11466 Used with the underlying type of an enum and the enum itself. */
11468 copy_type_enum (tree dst, tree src)
11470 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11471 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11472 TYPE_SIZE (dst) = TYPE_SIZE (src);
11473 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11474 SET_TYPE_MODE (dst, TYPE_MODE (src));
11475 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11476 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11477 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11478 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11481 /* Begin compiling the definition of an enumeration type.
11484 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11486 UNDERLYING_TYPE is the type that will be used as the storage for
11487 the enumeration type. This should be NULL_TREE if no storage type
11490 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11492 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11494 Returns the type object, as yet incomplete.
11495 Also records info about it so that build_enumerator
11496 may be used to declare the individual values as they are read. */
11499 start_enum (tree name, tree enumtype, tree underlying_type,
11500 bool scoped_enum_p, bool *is_new)
11502 tree prevtype = NULL_TREE;
11503 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11507 /* [C++0x dcl.enum]p5:
11509 If not explicitly specified, the underlying type of a scoped
11510 enumeration type is int. */
11511 if (!underlying_type && scoped_enum_p)
11512 underlying_type = integer_type_node;
11514 if (underlying_type)
11515 underlying_type = cv_unqualified (underlying_type);
11517 /* If this is the real definition for a previous forward reference,
11518 fill in the contents in the same object that used to be the
11519 forward reference. */
11521 enumtype = lookup_and_check_tag (enum_type, name,
11522 /*tag_scope=*/ts_current,
11523 /*template_header_p=*/false);
11525 /* In case of a template_decl, the only check that should be deferred
11526 to instantiation time is the comparison of underlying types. */
11527 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11529 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11531 error_at (input_location, "scoped/unscoped mismatch "
11532 "in enum %q#T", enumtype);
11533 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11534 "previous definition here");
11535 enumtype = error_mark_node;
11537 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11539 error_at (input_location, "underlying type mismatch "
11540 "in enum %q#T", enumtype);
11541 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11542 "previous definition here");
11543 enumtype = error_mark_node;
11545 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11546 && !dependent_type_p (underlying_type)
11547 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11548 && !same_type_p (underlying_type,
11549 ENUM_UNDERLYING_TYPE (enumtype)))
11551 error_at (input_location, "different underlying type "
11552 "in enum %q#T", enumtype);
11553 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11554 "previous definition here");
11555 underlying_type = NULL_TREE;
11559 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11560 || processing_template_decl)
11562 /* In case of error, make a dummy enum to allow parsing to
11564 if (enumtype == error_mark_node)
11566 name = make_anon_name ();
11567 enumtype = NULL_TREE;
11570 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11571 of an opaque enum, or an opaque enum of an already defined
11572 enumeration (C++0x only).
11573 In any other case, it'll be NULL_TREE. */
11579 prevtype = enumtype;
11580 enumtype = cxx_make_type (ENUMERAL_TYPE);
11581 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11582 if (enumtype == error_mark_node)
11583 return error_mark_node;
11585 /* The enum is considered opaque until the opening '{' of the
11586 enumerator list. */
11587 SET_OPAQUE_ENUM_P (enumtype, true);
11588 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11591 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11593 if (underlying_type)
11595 if (CP_INTEGRAL_TYPE_P (underlying_type))
11597 copy_type_enum (enumtype, underlying_type);
11598 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11600 else if (dependent_type_p (underlying_type))
11601 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11603 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11604 underlying_type, enumtype);
11607 /* If into a template class, the returned enum is always the first
11608 declaration (opaque or not) seen. This way all the references to
11609 this type will be to the same declaration. The following ones are used
11610 only to check for definition errors. */
11611 if (prevtype && processing_template_decl)
11617 /* After processing and defining all the values of an enumeration type,
11618 install their decls in the enumeration type.
11619 ENUMTYPE is the type object. */
11622 finish_enum_value_list (tree enumtype)
11625 tree underlying_type;
11628 tree minnode, maxnode;
11631 bool fixed_underlying_type_p
11632 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11634 /* We built up the VALUES in reverse order. */
11635 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11637 /* For an enum defined in a template, just set the type of the values;
11638 all further processing is postponed until the template is
11639 instantiated. We need to set the type so that tsubst of a CONST_DECL
11641 if (processing_template_decl)
11643 for (values = TYPE_VALUES (enumtype);
11645 values = TREE_CHAIN (values))
11646 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11650 /* Determine the minimum and maximum values of the enumerators. */
11651 if (TYPE_VALUES (enumtype))
11653 minnode = maxnode = NULL_TREE;
11655 for (values = TYPE_VALUES (enumtype);
11657 values = TREE_CHAIN (values))
11659 decl = TREE_VALUE (values);
11661 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11662 each enumerator has the type of its enumeration. Prior to the
11663 closing brace, the type of each enumerator is the type of its
11664 initializing value. */
11665 TREE_TYPE (decl) = enumtype;
11667 /* Update the minimum and maximum values, if appropriate. */
11668 value = DECL_INITIAL (decl);
11669 if (value == error_mark_node)
11670 value = integer_zero_node;
11671 /* Figure out what the minimum and maximum values of the
11672 enumerators are. */
11674 minnode = maxnode = value;
11675 else if (tree_int_cst_lt (maxnode, value))
11677 else if (tree_int_cst_lt (value, minnode))
11684 If the enumerator-list is empty, the underlying type is as if
11685 the enumeration had a single enumerator with value 0. */
11686 minnode = maxnode = integer_zero_node;
11688 if (!fixed_underlying_type_p)
11690 /* Compute the number of bits require to represent all values of the
11691 enumeration. We must do this before the type of MINNODE and
11692 MAXNODE are transformed, since tree_int_cst_min_precision relies
11693 on the TREE_TYPE of the value it is passed. */
11694 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11695 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11696 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11697 int precision = MAX (lowprec, highprec);
11699 bool use_short_enum;
11701 /* Determine the underlying type of the enumeration.
11705 The underlying type of an enumeration is an integral type that
11706 can represent all the enumerator values defined in the
11707 enumeration. It is implementation-defined which integral type is
11708 used as the underlying type for an enumeration except that the
11709 underlying type shall not be larger than int unless the value of
11710 an enumerator cannot fit in an int or unsigned int.
11712 We use "int" or an "unsigned int" as the underlying type, even if
11713 a smaller integral type would work, unless the user has
11714 explicitly requested that we use the smallest possible type. The
11715 user can request that for all enumerations with a command line
11716 flag, or for just one enumeration with an attribute. */
11718 use_short_enum = flag_short_enums
11719 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11721 for (itk = (use_short_enum ? itk_char : itk_int);
11725 underlying_type = integer_types[itk];
11726 if (underlying_type != NULL_TREE
11727 && TYPE_PRECISION (underlying_type) >= precision
11728 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11731 if (itk == itk_none)
11735 IF no integral type can represent all the enumerator values, the
11736 enumeration is ill-formed. */
11737 error ("no integral type can represent all of the enumerator values "
11738 "for %qT", enumtype);
11739 precision = TYPE_PRECISION (long_long_integer_type_node);
11740 underlying_type = integer_types[itk_unsigned_long_long];
11745 The value of sizeof() applied to an enumeration type, an object
11746 of an enumeration type, or an enumerator, is the value of sizeof()
11747 applied to the underlying type. */
11748 copy_type_enum (enumtype, underlying_type);
11750 /* Compute the minimum and maximum values for the type.
11754 For an enumeration where emin is the smallest enumerator and emax
11755 is the largest, the values of the enumeration are the values of the
11756 underlying type in the range bmin to bmax, where bmin and bmax are,
11757 respectively, the smallest and largest values of the smallest bit-
11758 field that can store emin and emax. */
11760 /* The middle-end currently assumes that types with TYPE_PRECISION
11761 narrower than their underlying type are suitably zero or sign
11762 extended to fill their mode. Similarly, it assumes that the front
11763 end assures that a value of a particular type must be within
11764 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11766 We used to set these fields based on bmin and bmax, but that led
11767 to invalid assumptions like optimizing away bounds checking. So
11768 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11769 TYPE_MAX_VALUE to the values for the mode above and only restrict
11770 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11771 ENUM_UNDERLYING_TYPE (enumtype)
11772 = build_distinct_type_copy (underlying_type);
11773 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11774 set_min_and_max_values_for_integral_type
11775 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11777 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11778 if (flag_strict_enums)
11779 set_min_and_max_values_for_integral_type (enumtype, precision,
11783 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11785 /* Convert each of the enumerators to the type of the underlying
11786 type of the enumeration. */
11787 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11789 location_t saved_location;
11791 decl = TREE_VALUE (values);
11792 saved_location = input_location;
11793 input_location = DECL_SOURCE_LOCATION (decl);
11794 if (fixed_underlying_type_p)
11795 /* If the enumeration type has a fixed underlying type, we
11796 already checked all of the enumerator values. */
11797 value = DECL_INITIAL (decl);
11799 value = perform_implicit_conversion (underlying_type,
11800 DECL_INITIAL (decl),
11801 tf_warning_or_error);
11802 input_location = saved_location;
11804 /* Do not clobber shared ints. */
11805 value = copy_node (value);
11807 TREE_TYPE (value) = enumtype;
11808 DECL_INITIAL (decl) = value;
11811 /* Fix up all variant types of this enum type. */
11812 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11813 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11815 /* Finish debugging output for this type. */
11816 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11819 /* Finishes the enum type. This is called only the first time an
11820 enumeration is seen, be it opaque or odinary.
11821 ENUMTYPE is the type object. */
11824 finish_enum (tree enumtype)
11826 if (processing_template_decl)
11828 if (at_function_scope_p ())
11829 add_stmt (build_min (TAG_DEFN, enumtype));
11833 /* Here there should not be any variants of this type. */
11834 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11835 && !TYPE_NEXT_VARIANT (enumtype));
11838 /* Build and install a CONST_DECL for an enumeration constant of the
11839 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11840 LOC is the location of NAME.
11841 Assignment of sequential values by default is handled here. */
11844 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11850 /* If the VALUE was erroneous, pretend it wasn't there; that will
11851 result in the enum being assigned the next value in sequence. */
11852 if (value == error_mark_node)
11855 /* Remove no-op casts from the value. */
11857 STRIP_TYPE_NOPS (value);
11859 if (! processing_template_decl)
11861 /* Validate and default VALUE. */
11862 if (value != NULL_TREE)
11864 value = cxx_constant_value (value);
11866 if (TREE_CODE (value) == INTEGER_CST)
11868 value = perform_integral_promotions (value);
11872 error ("enumerator value for %qD is not an integer constant", name);
11877 /* Default based on previous value. */
11878 if (value == NULL_TREE)
11880 if (TYPE_VALUES (enumtype))
11883 unsigned HOST_WIDE_INT lo;
11887 /* The next value is the previous value plus one.
11888 add_double doesn't know the type of the target expression,
11889 so we must check with int_fits_type_p as well. */
11890 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11891 if (error_operand_p (prev_value))
11892 value = error_mark_node;
11895 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11896 TREE_INT_CST_HIGH (prev_value),
11898 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11900 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11904 error ("overflow in enumeration values at %qD", name);
11905 value = error_mark_node;
11910 value = integer_zero_node;
11913 /* Remove no-op casts from the value. */
11914 STRIP_TYPE_NOPS (value);
11916 /* If the underlying type of the enum is fixed, check whether
11917 the enumerator values fits in the underlying type. If it
11918 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11919 if (ENUM_UNDERLYING_TYPE (enumtype)
11921 && TREE_CODE (value) == INTEGER_CST
11922 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11924 error ("enumerator value %E is too large for underlying type %<%T%>",
11925 value, ENUM_UNDERLYING_TYPE (enumtype));
11927 /* Silently convert the value so that we can continue. */
11928 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11933 /* C++ associates enums with global, function, or class declarations. */
11934 context = current_scope ();
11936 /* Build the actual enumeration constant. Note that the enumeration
11937 constants have the underlying type of the enum (if it is fixed)
11938 or the type of their initializer (if the underlying type of the
11939 enum is not fixed):
11943 If the underlying type is fixed, the type of each enumerator
11944 prior to the closing brace is the underlying type; if the
11945 initializing value of an enumerator cannot be represented by
11946 the underlying type, the program is ill-formed. If the
11947 underlying type is not fixed, the type of each enumerator is
11948 the type of its initializing value.
11950 If the underlying type is not fixed, it will be computed by
11951 finish_enum and we will reset the type of this enumerator. Of
11952 course, if we're processing a template, there may be no value. */
11953 type = value ? TREE_TYPE (value) : NULL_TREE;
11955 if (context && context == current_class_type)
11956 /* This enum declaration is local to the class. We need the full
11957 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11958 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11960 /* It's a global enum, or it's local to a function. (Note local to
11961 a function could mean local to a class method. */
11962 decl = build_decl (loc, CONST_DECL, name, type);
11964 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11965 TREE_CONSTANT (decl) = 1;
11966 TREE_READONLY (decl) = 1;
11967 DECL_INITIAL (decl) = value;
11969 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11970 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11971 on the TYPE_FIELDS list for `S'. (That's so that you can say
11972 things like `S::i' later.) */
11973 finish_member_declaration (decl);
11977 /* Add this enumeration constant to the list for this type. */
11978 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11981 /* Look for an enumerator with the given NAME within the enumeration
11982 type ENUMTYPE. This routine is used primarily for qualified name
11983 lookup into an enumerator in C++0x, e.g.,
11985 enum class Color { Red, Green, Blue };
11987 Color color = Color::Red;
11989 Returns the value corresponding to the enumerator, or
11990 NULL_TREE if no such enumerator was found. */
11992 lookup_enumerator (tree enumtype, tree name)
11995 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11997 e = purpose_member (name, TYPE_VALUES (enumtype));
11998 return e? TREE_VALUE (e) : NULL_TREE;
12002 /* We're defining DECL. Make sure that its type is OK. */
12005 check_function_type (tree decl, tree current_function_parms)
12007 tree fntype = TREE_TYPE (decl);
12008 tree return_type = complete_type (TREE_TYPE (fntype));
12010 /* In a function definition, arg types must be complete. */
12011 require_complete_types_for_parms (current_function_parms);
12013 if (dependent_type_p (return_type))
12015 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12016 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12018 tree args = TYPE_ARG_TYPES (fntype);
12020 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12021 error ("return type %q#T is incomplete", return_type);
12023 error ("return type has Java class type %q#T", return_type);
12025 /* Make it return void instead. */
12026 if (TREE_CODE (fntype) == METHOD_TYPE)
12027 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12029 TREE_CHAIN (args));
12031 fntype = build_function_type (void_type_node, args);
12033 = build_exception_variant (fntype,
12034 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12035 fntype = (cp_build_type_attribute_variant
12036 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12037 TREE_TYPE (decl) = fntype;
12040 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12043 /* Create the FUNCTION_DECL for a function definition.
12044 DECLSPECS and DECLARATOR are the parts of the declaration;
12045 they describe the function's name and the type it returns,
12046 but twisted together in a fashion that parallels the syntax of C.
12048 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12049 DECLARATOR is really the DECL for the function we are about to
12050 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12051 indicating that the function is an inline defined in-class.
12053 This function creates a binding context for the function body
12054 as well as setting up the FUNCTION_DECL in current_function_decl.
12056 For C++, we must first check whether that datum makes any sense.
12057 For example, "class A local_a(1,2);" means that variable local_a
12058 is an aggregate of type A, which should have a constructor
12059 applied to it with the argument list [1, 2].
12061 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12062 or may be a BLOCK if the function has been defined previously
12063 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12064 error_mark_node if the function has never been defined, or
12065 a BLOCK if the function has been defined somewhere. */
12068 start_preparsed_function (tree decl1, tree attrs, int flags)
12070 tree ctype = NULL_TREE;
12073 int doing_friend = 0;
12074 struct cp_binding_level *bl;
12075 tree current_function_parms;
12076 struct c_fileinfo *finfo
12077 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12078 bool honor_interface;
12080 /* Sanity check. */
12081 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12082 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12084 fntype = TREE_TYPE (decl1);
12085 if (TREE_CODE (fntype) == METHOD_TYPE)
12086 ctype = TYPE_METHOD_BASETYPE (fntype);
12088 /* ISO C++ 11.4/5. A friend function defined in a class is in
12089 the (lexical) scope of the class in which it is defined. */
12090 if (!ctype && DECL_FRIEND_P (decl1))
12092 ctype = DECL_FRIEND_CONTEXT (decl1);
12094 /* CTYPE could be null here if we're dealing with a template;
12095 for example, `inline friend float foo()' inside a template
12096 will have no CTYPE set. */
12097 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12103 if (DECL_DECLARED_INLINE_P (decl1)
12104 && lookup_attribute ("noinline", attrs))
12105 warning (0, "inline function %q+D given attribute noinline", decl1);
12107 /* Handle gnu_inline attribute. */
12108 if (GNU_INLINE_P (decl1))
12110 DECL_EXTERNAL (decl1) = 1;
12111 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12112 DECL_INTERFACE_KNOWN (decl1) = 1;
12113 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12116 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12117 /* This is a constructor, we must ensure that any default args
12118 introduced by this definition are propagated to the clones
12119 now. The clones are used directly in overload resolution. */
12120 adjust_clone_args (decl1);
12122 /* Sometimes we don't notice that a function is a static member, and
12123 build a METHOD_TYPE for it. Fix that up now. */
12124 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12125 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12127 revert_static_member_fn (decl1);
12131 /* Set up current_class_type, and enter the scope of the class, if
12134 push_nested_class (ctype);
12135 else if (DECL_STATIC_FUNCTION_P (decl1))
12136 push_nested_class (DECL_CONTEXT (decl1));
12138 /* Now that we have entered the scope of the class, we must restore
12139 the bindings for any template parameters surrounding DECL1, if it
12140 is an inline member template. (Order is important; consider the
12141 case where a template parameter has the same name as a field of
12142 the class.) It is not until after this point that
12143 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12144 if (flags & SF_INCLASS_INLINE)
12145 maybe_begin_member_template_processing (decl1);
12147 /* Effective C++ rule 15. */
12149 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12150 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12151 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12153 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12154 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12155 if (!DECL_INITIAL (decl1))
12156 DECL_INITIAL (decl1) = error_mark_node;
12158 /* This function exists in static storage.
12159 (This does not mean `static' in the C sense!) */
12160 TREE_STATIC (decl1) = 1;
12162 /* We must call push_template_decl after current_class_type is set
12163 up. (If we are processing inline definitions after exiting a
12164 class scope, current_class_type will be NULL_TREE until set above
12165 by push_nested_class.) */
12166 if (processing_template_decl)
12168 /* FIXME: Handle error_mark_node more gracefully. */
12169 tree newdecl1 = push_template_decl (decl1);
12170 if (newdecl1 != error_mark_node)
12174 /* We are now in the scope of the function being defined. */
12175 current_function_decl = decl1;
12177 /* Save the parm names or decls from this function's declarator
12178 where store_parm_decls will find them. */
12179 current_function_parms = DECL_ARGUMENTS (decl1);
12181 /* Make sure the parameter and return types are reasonable. When
12182 you declare a function, these types can be incomplete, but they
12183 must be complete when you define the function. */
12184 check_function_type (decl1, current_function_parms);
12186 /* Build the return declaration for the function. */
12187 restype = TREE_TYPE (fntype);
12188 if (DECL_RESULT (decl1) == NULL_TREE)
12192 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12193 DECL_ARTIFICIAL (resdecl) = 1;
12194 DECL_IGNORED_P (resdecl) = 1;
12195 DECL_RESULT (decl1) = resdecl;
12197 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12200 /* Let the user know we're compiling this function. */
12201 announce_function (decl1);
12203 /* Record the decl so that the function name is defined.
12204 If we already have a decl for this name, and it is a FUNCTION_DECL,
12205 use the old decl. */
12206 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12208 /* A specialization is not used to guide overload resolution. */
12209 if (!DECL_FUNCTION_MEMBER_P (decl1)
12210 && !(DECL_USE_TEMPLATE (decl1) &&
12211 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12213 tree olddecl = pushdecl (decl1);
12215 if (olddecl == error_mark_node)
12216 /* If something went wrong when registering the declaration,
12217 use DECL1; we have to have a FUNCTION_DECL to use when
12218 parsing the body of the function. */
12222 /* Otherwise, OLDDECL is either a previous declaration
12223 of the same function or DECL1 itself. */
12225 if (warn_missing_declarations
12226 && olddecl == decl1
12227 && !DECL_MAIN_P (decl1)
12228 && TREE_PUBLIC (decl1)
12229 && !DECL_DECLARED_INLINE_P (decl1))
12233 /* Check whether DECL1 is in an anonymous
12235 for (context = DECL_CONTEXT (decl1);
12237 context = DECL_CONTEXT (context))
12239 if (TREE_CODE (context) == NAMESPACE_DECL
12240 && DECL_NAME (context) == NULL_TREE)
12244 if (context == NULL)
12245 warning (OPT_Wmissing_declarations,
12246 "no previous declaration for %q+D", decl1);
12254 /* We need to set the DECL_CONTEXT. */
12255 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12256 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12258 fntype = TREE_TYPE (decl1);
12260 /* If #pragma weak applies, mark the decl appropriately now.
12261 The pragma only applies to global functions. Because
12262 determining whether or not the #pragma applies involves
12263 computing the mangled name for the declaration, we cannot
12264 apply the pragma until after we have merged this declaration
12265 with any previous declarations; if the original declaration
12266 has a linkage specification, that specification applies to
12267 the definition as well, and may affect the mangled name. */
12268 if (DECL_FILE_SCOPE_P (decl1))
12269 maybe_apply_pragma_weak (decl1);
12272 /* constexpr functions must have literal argument types and
12273 literal return type. */
12274 validate_constexpr_fundecl (decl1);
12276 /* Reset this in case the call to pushdecl changed it. */
12277 current_function_decl = decl1;
12279 gcc_assert (DECL_INITIAL (decl1));
12281 /* This function may already have been parsed, in which case just
12282 return; our caller will skip over the body without parsing. */
12283 if (DECL_INITIAL (decl1) != error_mark_node)
12286 /* Initialize RTL machinery. We cannot do this until
12287 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12288 even when processing a template; this is how we get
12289 CFUN set up, and our per-function variables initialized.
12290 FIXME factor out the non-RTL stuff. */
12291 bl = current_binding_level;
12292 allocate_struct_function (decl1, processing_template_decl);
12294 /* Initialize the language data structures. Whenever we start
12295 a new function, we destroy temporaries in the usual way. */
12296 cfun->language = ggc_alloc_cleared_language_function ();
12297 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12298 current_binding_level = bl;
12300 /* Even though we're inside a function body, we still don't want to
12301 call expand_expr to calculate the size of a variable-sized array.
12302 We haven't necessarily assigned RTL to all variables yet, so it's
12303 not safe to try to expand expressions involving them. */
12304 cfun->dont_save_pending_sizes_p = 1;
12306 /* Start the statement-tree, start the tree now. */
12307 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12309 /* If we are (erroneously) defining a function that we have already
12310 defined before, wipe out what we knew before. */
12311 if (!DECL_PENDING_INLINE_P (decl1))
12312 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12314 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12316 /* We know that this was set up by `grokclassfn'. We do not
12317 wait until `store_parm_decls', since evil parse errors may
12318 never get us to that point. Here we keep the consistency
12319 between `current_class_type' and `current_class_ptr'. */
12320 tree t = DECL_ARGUMENTS (decl1);
12322 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12323 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12325 cp_function_chain->x_current_class_ref
12326 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12327 cp_function_chain->x_current_class_ptr = t;
12329 /* Constructors and destructors need to know whether they're "in
12330 charge" of initializing virtual base classes. */
12331 t = DECL_CHAIN (t);
12332 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12334 current_in_charge_parm = t;
12335 t = DECL_CHAIN (t);
12337 if (DECL_HAS_VTT_PARM_P (decl1))
12339 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12340 current_vtt_parm = t;
12344 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12345 /* Implicitly-defined methods (like the
12346 destructor for a class in which no destructor
12347 is explicitly declared) must not be defined
12348 until their definition is needed. So, we
12349 ignore interface specifications for
12350 compiler-generated functions. */
12351 && !DECL_ARTIFICIAL (decl1));
12353 if (DECL_INTERFACE_KNOWN (decl1))
12355 tree ctx = decl_function_context (decl1);
12357 if (DECL_NOT_REALLY_EXTERN (decl1))
12358 DECL_EXTERNAL (decl1) = 0;
12360 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12361 && TREE_PUBLIC (ctx))
12362 /* This is a function in a local class in an extern inline
12364 comdat_linkage (decl1);
12366 /* If this function belongs to an interface, it is public.
12367 If it belongs to someone else's interface, it is also external.
12368 This only affects inlines and template instantiations. */
12369 else if (!finfo->interface_unknown && honor_interface)
12371 if (DECL_DECLARED_INLINE_P (decl1)
12372 || DECL_TEMPLATE_INSTANTIATION (decl1)
12373 || processing_template_decl)
12375 DECL_EXTERNAL (decl1)
12376 = (finfo->interface_only
12377 || (DECL_DECLARED_INLINE_P (decl1)
12378 && ! flag_implement_inlines
12379 && !DECL_VINDEX (decl1)));
12381 /* For WIN32 we also want to put these in linkonce sections. */
12382 maybe_make_one_only (decl1);
12385 DECL_EXTERNAL (decl1) = 0;
12386 DECL_INTERFACE_KNOWN (decl1) = 1;
12387 /* If this function is in an interface implemented in this file,
12388 make sure that the back end knows to emit this function
12390 if (!DECL_EXTERNAL (decl1))
12391 mark_needed (decl1);
12393 else if (finfo->interface_unknown && finfo->interface_only
12394 && honor_interface)
12396 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12397 interface, we will have both finfo->interface_unknown and
12398 finfo->interface_only set. In that case, we don't want to
12399 use the normal heuristics because someone will supply a
12400 #pragma implementation elsewhere, and deducing it here would
12401 produce a conflict. */
12402 comdat_linkage (decl1);
12403 DECL_EXTERNAL (decl1) = 0;
12404 DECL_INTERFACE_KNOWN (decl1) = 1;
12405 DECL_DEFER_OUTPUT (decl1) = 1;
12409 /* This is a definition, not a reference.
12410 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12411 if (!GNU_INLINE_P (decl1))
12412 DECL_EXTERNAL (decl1) = 0;
12414 if ((DECL_DECLARED_INLINE_P (decl1)
12415 || DECL_TEMPLATE_INSTANTIATION (decl1))
12416 && ! DECL_INTERFACE_KNOWN (decl1))
12417 DECL_DEFER_OUTPUT (decl1) = 1;
12419 DECL_INTERFACE_KNOWN (decl1) = 1;
12422 /* Determine the ELF visibility attribute for the function. We must not
12423 do this before calling "pushdecl", as we must allow "duplicate_decls"
12424 to merge any attributes appropriately. We also need to wait until
12426 if (!DECL_CLONED_FUNCTION_P (decl1))
12427 determine_visibility (decl1);
12429 begin_scope (sk_function_parms, decl1);
12433 if (DECL_DESTRUCTOR_P (decl1)
12434 || (DECL_CONSTRUCTOR_P (decl1)
12435 && targetm.cxx.cdtor_returns_this ()))
12437 cdtor_label = build_decl (input_location,
12438 LABEL_DECL, NULL_TREE, NULL_TREE);
12439 DECL_CONTEXT (cdtor_label) = current_function_decl;
12442 start_fname_decls ();
12444 store_parm_decls (current_function_parms);
12448 /* Like start_preparsed_function, except that instead of a
12449 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12451 Returns 1 on success. If the DECLARATOR is not suitable for a function
12452 (it defines a datum instead), we return 0, which tells
12453 yyparse to report a parse error. */
12456 start_function (cp_decl_specifier_seq *declspecs,
12457 const cp_declarator *declarator,
12462 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12463 if (decl1 == error_mark_node)
12465 /* If the declarator is not suitable for a function definition,
12466 cause a syntax error. */
12467 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12469 error ("invalid function declaration");
12473 if (DECL_MAIN_P (decl1))
12474 /* main must return int. grokfndecl should have corrected it
12475 (and issued a diagnostic) if the user got it wrong. */
12476 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12477 integer_type_node));
12479 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12484 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12488 use_eh_spec_block (tree fn)
12490 return (flag_exceptions && flag_enforce_eh_specs
12491 && !processing_template_decl
12492 && !type_throw_all_p (TREE_TYPE (fn))
12493 /* We insert the EH_SPEC_BLOCK only in the original
12494 function; then, it is copied automatically to the
12496 && !DECL_CLONED_FUNCTION_P (fn)
12497 /* Implicitly-generated constructors and destructors have
12498 exception specifications. However, those specifications
12499 are the union of the possible exceptions specified by the
12500 constructors/destructors for bases and members, so no
12501 unallowed exception will ever reach this function. By
12502 not creating the EH_SPEC_BLOCK we save a little memory,
12503 and we avoid spurious warnings about unreachable
12505 && !DECL_ARTIFICIAL (fn));
12508 /* Store the parameter declarations into the current function declaration.
12509 This is called after parsing the parameter declarations, before
12510 digesting the body of the function.
12512 Also install to binding contour return value identifier, if any. */
12515 store_parm_decls (tree current_function_parms)
12517 tree fndecl = current_function_decl;
12520 /* This is a chain of any other decls that came in among the parm
12521 declarations. If a parm is declared with enum {foo, bar} x;
12522 then CONST_DECLs for foo and bar are put here. */
12523 tree nonparms = NULL_TREE;
12525 if (current_function_parms)
12527 /* This case is when the function was defined with an ANSI prototype.
12528 The parms already have decls, so we need not do anything here
12529 except record them as in effect
12530 and complain if any redundant old-style parm decls were written. */
12532 tree specparms = current_function_parms;
12535 /* Must clear this because it might contain TYPE_DECLs declared
12537 current_binding_level->names = NULL;
12539 /* If we're doing semantic analysis, then we'll call pushdecl
12540 for each of these. We must do them in reverse order so that
12541 they end in the correct forward order. */
12542 specparms = nreverse (specparms);
12544 for (parm = specparms; parm; parm = next)
12546 next = DECL_CHAIN (parm);
12547 if (TREE_CODE (parm) == PARM_DECL)
12549 if (DECL_NAME (parm) == NULL_TREE
12550 || TREE_CODE (parm) != VOID_TYPE)
12553 error ("parameter %qD declared void", parm);
12557 /* If we find an enum constant or a type tag,
12558 put it aside for the moment. */
12559 TREE_CHAIN (parm) = NULL_TREE;
12560 nonparms = chainon (nonparms, parm);
12564 /* Get the decls in their original chain order and record in the
12565 function. This is all and only the PARM_DECLs that were
12566 pushed into scope by the loop above. */
12567 DECL_ARGUMENTS (fndecl) = getdecls ();
12570 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12572 /* Now store the final chain of decls for the arguments
12573 as the decl-chain of the current lexical scope.
12574 Put the enumerators in as well, at the front so that
12575 DECL_ARGUMENTS is not modified. */
12576 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12578 if (use_eh_spec_block (current_function_decl))
12579 current_eh_spec_block = begin_eh_spec_block ();
12583 /* We have finished doing semantic analysis on DECL, but have not yet
12584 generated RTL for its body. Save away our current state, so that
12585 when we want to generate RTL later we know what to do. */
12588 save_function_data (tree decl)
12590 struct language_function *f;
12592 /* Save the language-specific per-function data so that we can
12593 get it back when we really expand this function. */
12594 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12597 f = ggc_alloc_language_function ();
12598 memcpy (f, cp_function_chain, sizeof (struct language_function));
12599 DECL_SAVED_FUNCTION_DATA (decl) = f;
12601 /* Clear out the bits we don't need. */
12602 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12603 f->bindings = NULL;
12604 f->x_local_names = NULL;
12608 /* Set the return value of the constructor (if present). */
12611 finish_constructor_body (void)
12616 if (targetm.cxx.cdtor_returns_this ()
12617 && (! TYPE_FOR_JAVA (current_class_type)))
12619 /* Any return from a constructor will end up here. */
12620 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12622 val = DECL_ARGUMENTS (current_function_decl);
12623 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12624 DECL_RESULT (current_function_decl), val);
12625 /* Return the address of the object. */
12626 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12627 add_stmt (exprstmt);
12631 /* Do all the processing for the beginning of a destructor; set up the
12632 vtable pointers and cleanups for bases and members. */
12635 begin_destructor_body (void)
12637 tree compound_stmt;
12639 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12640 issued an error message. We still want to try to process the
12641 body of the function, but initialize_vtbl_ptrs will crash if
12642 TYPE_BINFO is NULL. */
12643 if (COMPLETE_TYPE_P (current_class_type))
12645 compound_stmt = begin_compound_stmt (0);
12646 /* Make all virtual function table pointers in non-virtual base
12647 classes point to CURRENT_CLASS_TYPE's virtual function
12649 initialize_vtbl_ptrs (current_class_ptr);
12650 finish_compound_stmt (compound_stmt);
12652 /* And insert cleanups for our bases and members so that they
12653 will be properly destroyed if we throw. */
12654 push_base_cleanups ();
12658 /* At the end of every destructor we generate code to delete the object if
12659 necessary. Do that now. */
12662 finish_destructor_body (void)
12666 /* Any return from a destructor will end up here; that way all base
12667 and member cleanups will be run when the function returns. */
12668 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12670 /* In a virtual destructor, we must call delete. */
12671 if (DECL_VIRTUAL_P (current_function_decl))
12674 tree virtual_size = cxx_sizeof (current_class_type);
12678 At the point of definition of a virtual destructor (including
12679 an implicit definition), non-placement operator delete shall
12680 be looked up in the scope of the destructor's class and if
12681 found shall be accessible and unambiguous. */
12682 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12684 /*global_p=*/false,
12685 /*placement=*/NULL_TREE,
12686 /*alloc_fn=*/NULL_TREE);
12688 if_stmt = begin_if_stmt ();
12689 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12690 current_in_charge_parm,
12693 finish_expr_stmt (exprstmt);
12694 finish_then_clause (if_stmt);
12695 finish_if_stmt (if_stmt);
12698 if (targetm.cxx.cdtor_returns_this ())
12702 val = DECL_ARGUMENTS (current_function_decl);
12703 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12704 DECL_RESULT (current_function_decl), val);
12705 /* Return the address of the object. */
12706 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12707 add_stmt (exprstmt);
12711 /* Do the necessary processing for the beginning of a function body, which
12712 in this case includes member-initializers, but not the catch clauses of
12713 a function-try-block. Currently, this means opening a binding level
12714 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12717 begin_function_body (void)
12721 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12724 if (processing_template_decl)
12725 /* Do nothing now. */;
12727 /* Always keep the BLOCK node associated with the outermost pair of
12728 curly braces of a function. These are needed for correct
12729 operation of dwarfout.c. */
12730 keep_next_level (true);
12732 stmt = begin_compound_stmt (BCS_FN_BODY);
12734 if (processing_template_decl)
12735 /* Do nothing now. */;
12736 else if (DECL_DESTRUCTOR_P (current_function_decl))
12737 begin_destructor_body ();
12742 /* Do the processing for the end of a function body. Currently, this means
12743 closing out the cleanups for fully-constructed bases and members, and in
12744 the case of the destructor, deleting the object if desired. Again, this
12745 is only meaningful for [cd]tors, since they are the only functions where
12746 there is a significant distinction between the main body and any
12747 function catch clauses. Handling, say, main() return semantics here
12748 would be wrong, as flowing off the end of a function catch clause for
12749 main() would also need to return 0. */
12752 finish_function_body (tree compstmt)
12754 if (compstmt == NULL_TREE)
12757 /* Close the block. */
12758 finish_compound_stmt (compstmt);
12760 if (processing_template_decl)
12761 /* Do nothing now. */;
12762 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12763 finish_constructor_body ();
12764 else if (DECL_DESTRUCTOR_P (current_function_decl))
12765 finish_destructor_body ();
12768 /* Given a function, returns the BLOCK corresponding to the outermost level
12769 of curly braces, skipping the artificial block created for constructor
12773 outer_curly_brace_block (tree fndecl)
12775 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12776 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12777 /* Skip the artificial function body block. */
12778 block = BLOCK_SUBBLOCKS (block);
12782 /* If FNDECL is a class's key method, add the class to the list of
12783 keyed classes that should be emitted. */
12786 record_key_method_defined (tree fndecl)
12788 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12789 && DECL_VIRTUAL_P (fndecl)
12790 && !processing_template_decl)
12792 tree fnclass = DECL_CONTEXT (fndecl);
12793 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12794 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12798 /* Subroutine of finish_function.
12799 Save the body of constexpr functions for possible
12800 future compile time evaluation. */
12803 maybe_save_function_definition (tree fun)
12805 if (!processing_template_decl
12806 && DECL_DECLARED_CONSTEXPR_P (fun)
12807 && !DECL_CLONED_FUNCTION_P (fun))
12808 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12811 /* Finish up a function declaration and compile that function
12812 all the way to assembler language output. The free the storage
12813 for the function definition.
12815 FLAGS is a bitwise or of the following values:
12817 We just finished processing the body of an in-class inline
12818 function definition. (This processing will have taken place
12819 after the class definition is complete.) */
12822 finish_function (int flags)
12824 tree fndecl = current_function_decl;
12825 tree fntype, ctype = NULL_TREE;
12826 int inclass_inline = (flags & 2) != 0;
12828 /* When we get some parse errors, we can end up without a
12829 current_function_decl, so cope. */
12830 if (fndecl == NULL_TREE)
12831 return error_mark_node;
12833 if (c_dialect_objc ())
12834 objc_finish_function ();
12836 gcc_assert (!defer_mark_used_calls);
12837 defer_mark_used_calls = true;
12839 record_key_method_defined (fndecl);
12841 fntype = TREE_TYPE (fndecl);
12843 /* TREE_READONLY (fndecl) = 1;
12844 This caused &foo to be of type ptr-to-const-function
12845 which then got a warning when stored in a ptr-to-function variable. */
12847 gcc_assert (building_stmt_tree ());
12848 /* The current function is being defined, so its DECL_INITIAL should
12849 be set, and unless there's a multiple definition, it should be
12850 error_mark_node. */
12851 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12853 /* For a cloned function, we've already got all the code we need;
12854 there's no need to add any extra bits. */
12855 if (!DECL_CLONED_FUNCTION_P (fndecl))
12857 if (DECL_MAIN_P (current_function_decl))
12861 /* Make it so that `main' always returns 0 by default (or
12864 stmt = finish_return_stmt (integer_one_node);
12866 stmt = finish_return_stmt (integer_zero_node);
12868 /* Hack. We don't want the middle-end to warn that this
12869 return is unreachable, so put the statement on the
12872 location_t linezero = linemap_line_start (line_table, 0, 1);
12873 SET_EXPR_LOCATION (stmt, linezero);
12877 if (use_eh_spec_block (current_function_decl))
12878 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12879 (TREE_TYPE (current_function_decl)),
12880 current_eh_spec_block);
12883 /* If we're saving up tree structure, tie off the function now. */
12884 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12886 finish_fname_decls ();
12888 /* If this function can't throw any exceptions, remember that. */
12889 if (!processing_template_decl
12890 && !cp_function_chain->can_throw
12891 && !flag_non_call_exceptions
12892 && !decl_replaceable_p (fndecl))
12893 TREE_NOTHROW (fndecl) = 1;
12895 /* This must come after expand_function_end because cleanups might
12896 have declarations (from inline functions) that need to go into
12897 this function's blocks. */
12899 /* If the current binding level isn't the outermost binding level
12900 for this function, either there is a bug, or we have experienced
12901 syntax errors and the statement tree is malformed. */
12902 if (current_binding_level->kind != sk_function_parms)
12904 /* Make sure we have already experienced errors. */
12905 gcc_assert (errorcount);
12907 /* Throw away the broken statement tree and extra binding
12909 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12911 while (current_binding_level->kind != sk_function_parms)
12913 if (current_binding_level->kind == sk_class)
12914 pop_nested_class ();
12916 poplevel (0, 0, 0);
12919 poplevel (1, 0, 1);
12921 /* Statements should always be full-expressions at the outermost set
12922 of curly braces for a function. */
12923 gcc_assert (stmts_are_full_exprs_p ());
12925 /* Save constexpr function body before it gets munged by
12926 the NRV transformation. */
12927 maybe_save_function_definition (fndecl);
12929 /* Set up the named return value optimization, if we can. Candidate
12930 variables are selected in check_return_expr. */
12931 if (current_function_return_value)
12933 tree r = current_function_return_value;
12936 if (r != error_mark_node
12937 /* This is only worth doing for fns that return in memory--and
12938 simpler, since we don't have to worry about promoted modes. */
12939 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12940 /* Only allow this for variables declared in the outer scope of
12941 the function so we know that their lifetime always ends with a
12942 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12943 we were to do this optimization in tree-ssa. */
12944 && (outer = outer_curly_brace_block (fndecl))
12945 && chain_member (r, BLOCK_VARS (outer)))
12946 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12948 current_function_return_value = NULL_TREE;
12951 /* Remember that we were in class scope. */
12952 if (current_class_name)
12953 ctype = current_class_type;
12955 /* Must mark the RESULT_DECL as being in this function. */
12956 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12958 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12959 to the FUNCTION_DECL node itself. */
12960 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12962 /* Save away current state, if appropriate. */
12963 if (!processing_template_decl)
12964 save_function_data (fndecl);
12966 /* Complain if there's just no return statement. */
12967 if (warn_return_type
12968 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12969 && !dependent_type_p (TREE_TYPE (fntype))
12970 && !current_function_returns_value && !current_function_returns_null
12971 /* Don't complain if we abort or throw. */
12972 && !current_function_returns_abnormally
12973 /* Don't complain if we are declared noreturn. */
12974 && !TREE_THIS_VOLATILE (fndecl)
12975 && !DECL_NAME (DECL_RESULT (fndecl))
12976 && !TREE_NO_WARNING (fndecl)
12977 /* Structor return values (if any) are set by the compiler. */
12978 && !DECL_CONSTRUCTOR_P (fndecl)
12979 && !DECL_DESTRUCTOR_P (fndecl))
12981 warning (OPT_Wreturn_type,
12982 "no return statement in function returning non-void");
12983 TREE_NO_WARNING (fndecl) = 1;
12986 /* Store the end of the function, so that we get good line number
12987 info for the epilogue. */
12988 cfun->function_end_locus = input_location;
12990 /* Complain about parameters that are only set, but never otherwise used. */
12991 if (warn_unused_but_set_parameter
12992 && !processing_template_decl
12993 && errorcount == unused_but_set_errorcount
12994 && !DECL_CLONED_FUNCTION_P (fndecl))
12998 for (decl = DECL_ARGUMENTS (fndecl);
13000 decl = DECL_CHAIN (decl))
13001 if (TREE_USED (decl)
13002 && TREE_CODE (decl) == PARM_DECL
13003 && !DECL_READ_P (decl)
13004 && DECL_NAME (decl)
13005 && !DECL_ARTIFICIAL (decl)
13006 && !TREE_NO_WARNING (decl)
13007 && !DECL_IN_SYSTEM_HEADER (decl)
13008 && TREE_TYPE (decl) != error_mark_node
13009 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13010 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13011 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13012 warning (OPT_Wunused_but_set_parameter,
13013 "parameter %q+D set but not used", decl);
13014 unused_but_set_errorcount = errorcount;
13017 /* Genericize before inlining. */
13018 if (!processing_template_decl)
13020 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13021 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13022 cp_genericize (fndecl);
13023 /* Clear out the bits we don't need. */
13024 f->x_current_class_ptr = NULL;
13025 f->x_current_class_ref = NULL;
13026 f->x_eh_spec_block = NULL;
13027 f->x_in_charge_parm = NULL;
13028 f->x_vtt_parm = NULL;
13029 f->x_return_value = NULL;
13030 f->bindings = NULL;
13031 f->extern_decl_map = NULL;
13033 /* Clear out the bits we don't need. */
13034 local_names = NULL;
13036 /* We're leaving the context of this function, so zap cfun. It's still in
13037 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13039 current_function_decl = NULL;
13041 /* If this is an in-class inline definition, we may have to pop the
13042 bindings for the template parameters that we added in
13043 maybe_begin_member_template_processing when start_function was
13045 if (inclass_inline)
13046 maybe_end_member_template_processing ();
13048 /* Leave the scope of the class. */
13050 pop_nested_class ();
13055 current_function_decl = NULL_TREE;
13057 defer_mark_used_calls = false;
13058 if (deferred_mark_used_calls)
13063 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13065 VEC_free (tree, gc, deferred_mark_used_calls);
13071 /* Create the FUNCTION_DECL for a function definition.
13072 DECLSPECS and DECLARATOR are the parts of the declaration;
13073 they describe the return type and the name of the function,
13074 but twisted together in a fashion that parallels the syntax of C.
13076 This function creates a binding context for the function body
13077 as well as setting up the FUNCTION_DECL in current_function_decl.
13079 Returns a FUNCTION_DECL on success.
13081 If the DECLARATOR is not suitable for a function (it defines a datum
13082 instead), we return 0, which tells yyparse to report a parse error.
13084 May return void_type_node indicating that this method is actually
13085 a friend. See grokfield for more details.
13087 Came here with a `.pushlevel' .
13089 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13090 CHANGES TO CODE IN `grokfield'. */
13093 grokmethod (cp_decl_specifier_seq *declspecs,
13094 const cp_declarator *declarator, tree attrlist)
13096 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13099 if (fndecl == error_mark_node)
13100 return error_mark_node;
13102 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13104 error ("invalid member function declaration");
13105 return error_mark_node;
13109 cplus_decl_attributes (&fndecl, attrlist, 0);
13111 /* Pass friends other than inline friend functions back. */
13112 if (fndecl == void_type_node)
13115 if (DECL_IN_AGGR_P (fndecl))
13117 if (DECL_CLASS_SCOPE_P (fndecl))
13118 error ("%qD is already defined in class %qT", fndecl,
13119 DECL_CONTEXT (fndecl));
13120 return error_mark_node;
13123 check_template_shadow (fndecl);
13125 DECL_DECLARED_INLINE_P (fndecl) = 1;
13126 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13128 /* We process method specializations in finish_struct_1. */
13129 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13131 fndecl = push_template_decl (fndecl);
13132 if (fndecl == error_mark_node)
13136 if (! DECL_FRIEND_P (fndecl))
13138 if (DECL_CHAIN (fndecl))
13140 fndecl = copy_node (fndecl);
13141 TREE_CHAIN (fndecl) = NULL_TREE;
13145 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13147 DECL_IN_AGGR_P (fndecl) = 1;
13152 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13153 we can lay it out later, when and if its type becomes complete. */
13156 maybe_register_incomplete_var (tree var)
13158 gcc_assert (TREE_CODE (var) == VAR_DECL);
13160 /* Keep track of variables with incomplete types. */
13161 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13162 && DECL_EXTERNAL (var))
13164 tree inner_type = TREE_TYPE (var);
13166 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13167 inner_type = TREE_TYPE (inner_type);
13168 inner_type = TYPE_MAIN_VARIANT (inner_type);
13170 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13171 /* RTTI TD entries are created while defining the type_info. */
13172 || (TYPE_LANG_SPECIFIC (inner_type)
13173 && TYPE_BEING_DEFINED (inner_type)))
13176 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13178 iv->incomplete_type = inner_type;
13183 /* Called when a class type (given by TYPE) is defined. If there are
13184 any existing VAR_DECLs whose type has been completed by this
13185 declaration, update them now. */
13188 complete_vars (tree type)
13191 incomplete_var *iv;
13193 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13195 if (same_type_p (type, iv->incomplete_type))
13197 tree var = iv->decl;
13198 tree type = TREE_TYPE (var);
13199 /* Complete the type of the variable. The VAR_DECL itself
13200 will be laid out in expand_expr. */
13201 complete_type (type);
13202 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13203 /* Remove this entry from the list. */
13204 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13210 /* Check for pending declarations which may have abstract type. */
13211 complete_type_check_abstract (type);
13214 /* If DECL is of a type which needs a cleanup, build and return an
13215 expression to perform that cleanup here. Return NULL_TREE if no
13216 cleanup need be done. */
13219 cxx_maybe_build_cleanup (tree decl)
13225 /* Assume no cleanup is required. */
13226 cleanup = NULL_TREE;
13228 if (error_operand_p (decl))
13231 /* Handle "__attribute__((cleanup))". We run the cleanup function
13232 before the destructor since the destructor is what actually
13233 terminates the lifetime of the object. */
13234 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13241 /* Get the name specified by the user for the cleanup function. */
13242 id = TREE_VALUE (TREE_VALUE (attr));
13243 /* Look up the name to find the cleanup function to call. It is
13244 important to use lookup_name here because that is what is
13245 used in c-common.c:handle_cleanup_attribute when performing
13246 initial checks on the attribute. Note that those checks
13247 include ensuring that the function found is not an overloaded
13248 function, or an object with an overloaded call operator,
13249 etc.; we can rely on the fact that the function found is an
13250 ordinary FUNCTION_DECL. */
13251 fn = lookup_name (id);
13252 arg = build_address (decl);
13254 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13257 /* Handle ordinary C++ destructors. */
13258 type = TREE_TYPE (decl);
13259 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13261 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13262 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13263 && CLASSTYPE_VBASECLASSES (type));
13267 if (TREE_CODE (type) == ARRAY_TYPE)
13270 addr = build_address (decl);
13272 /* Optimize for space over speed here. */
13273 if (!has_vbases || flag_expensive_optimizations)
13274 flags |= LOOKUP_NONVIRTUAL;
13276 call = build_delete (TREE_TYPE (addr), addr,
13277 sfk_complete_destructor, flags, 0);
13279 cleanup = build_compound_expr (input_location, cleanup, call);
13287 /* When a stmt has been parsed, this function is called. */
13294 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13295 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13296 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13299 static_fn_type (tree memfntype)
13304 if (TYPE_PTRMEMFUNC_P (memfntype))
13305 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13306 if (POINTER_TYPE_P (memfntype)
13307 || TREE_CODE (memfntype) == FUNCTION_DECL)
13308 memfntype = TREE_TYPE (memfntype);
13309 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13311 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13312 args = TYPE_ARG_TYPES (memfntype);
13313 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13314 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13315 fntype = (cp_build_type_attribute_variant
13316 (fntype, TYPE_ATTRIBUTES (memfntype)));
13317 fntype = (build_exception_variant
13318 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13322 /* DECL was originally constructed as a non-static member function,
13323 but turned out to be static. Update it accordingly. */
13326 revert_static_member_fn (tree decl)
13328 TREE_TYPE (decl) = static_fn_type (decl);
13330 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13331 error ("static member function %q#D declared with type qualifiers", decl);
13333 if (DECL_ARGUMENTS (decl))
13334 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13335 DECL_STATIC_FUNCTION_P (decl) = 1;
13338 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13339 one of the language-independent trees. */
13341 enum cp_tree_node_structure_enum
13342 cp_tree_node_structure (union lang_tree_node * t)
13344 switch (TREE_CODE (&t->generic))
13346 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13347 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13348 case OVERLOAD: return TS_CP_OVERLOAD;
13349 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13350 case PTRMEM_CST: return TS_CP_PTRMEM;
13351 case BASELINK: return TS_CP_BASELINK;
13352 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13353 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13354 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13355 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13356 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13357 default: return TS_CP_GENERIC;
13361 /* Build the void_list_node (void_type_node having been created). */
13363 build_void_list_node (void)
13365 tree t = build_tree_list (NULL_TREE, void_type_node);
13370 cp_missing_noreturn_ok_p (tree decl)
13372 /* A missing noreturn is ok for the `main' function. */
13373 return DECL_MAIN_P (decl);
13376 /* Return the COMDAT group into which DECL should be placed. */
13379 cxx_comdat_group (tree decl)
13383 /* Virtual tables, construction virtual tables, and virtual table
13384 tables all go in a single COMDAT group, named after the primary
13386 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13387 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13388 /* For all other DECLs, the COMDAT group is the mangled name of the
13389 declaration itself. */
13392 while (DECL_THUNK_P (decl))
13394 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13395 into the same section as the target function. In that case
13396 we must return target's name. */
13397 tree target = THUNK_TARGET (decl);
13398 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13399 && DECL_SECTION_NAME (target) != NULL
13400 && DECL_ONE_ONLY (target))
13405 name = DECL_ASSEMBLER_NAME (decl);
13411 #include "gt-cp-decl.h"