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 (p2 == NULL_TREE && 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 (p1 == NULL_TREE
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);
1012 types_match = compparms (p1, p2);
1017 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1019 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1020 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1023 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1024 DECL_TEMPLATE_PARMS (olddecl)))
1027 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1028 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1029 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1031 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1032 DECL_TEMPLATE_RESULT (newdecl));
1036 /* Need to check scope for variable declaration (VAR_DECL).
1037 For typedef (TYPE_DECL), scope is ignored. */
1038 if (TREE_CODE (newdecl) == VAR_DECL
1039 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1041 Two declarations for an object with C language linkage
1042 with the same name (ignoring the namespace that qualify
1043 it) that appear in different namespace scopes refer to
1045 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1048 if (TREE_TYPE (newdecl) == error_mark_node)
1049 types_match = TREE_TYPE (olddecl) == error_mark_node;
1050 else if (TREE_TYPE (olddecl) == NULL_TREE)
1051 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1052 else if (TREE_TYPE (newdecl) == NULL_TREE)
1055 types_match = comptypes (TREE_TYPE (newdecl),
1056 TREE_TYPE (olddecl),
1057 COMPARE_REDECLARATION);
1063 /* If NEWDECL is `static' and an `extern' was seen previously,
1064 warn about it. OLDDECL is the previous declaration.
1066 Note that this does not apply to the C++ case of declaring
1067 a variable `extern const' and then later `const'.
1069 Don't complain about built-in functions, since they are beyond
1070 the user's control. */
1073 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1075 if (TREE_CODE (newdecl) == TYPE_DECL
1076 || TREE_CODE (newdecl) == TEMPLATE_DECL
1077 || TREE_CODE (newdecl) == CONST_DECL
1078 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1081 /* Don't get confused by static member functions; that's a different
1083 if (TREE_CODE (newdecl) == FUNCTION_DECL
1084 && DECL_STATIC_FUNCTION_P (newdecl))
1087 /* If the old declaration was `static', or the new one isn't, then
1088 then everything is OK. */
1089 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1092 /* It's OK to declare a builtin function as `static'. */
1093 if (TREE_CODE (olddecl) == FUNCTION_DECL
1094 && DECL_ARTIFICIAL (olddecl))
1097 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1098 permerror (input_location, "previous declaration of %q+D", olddecl);
1101 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1102 function templates. If their exception specifications do not
1103 match, issue a diagnostic. */
1106 check_redeclaration_exception_specification (tree new_decl,
1111 tree new_exceptions;
1112 tree old_exceptions;
1114 new_type = TREE_TYPE (new_decl);
1115 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1116 old_type = TREE_TYPE (old_decl);
1117 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1121 If any declaration of a function has an exception-specification,
1122 all declarations, including the definition and an explicit
1123 specialization, of that function shall have an
1124 exception-specification with the same set of type-ids. */
1125 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1126 && ! DECL_IS_BUILTIN (old_decl)
1128 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1130 error ("declaration of %qF has a different exception specifier",
1132 error ("from previous declaration %q+F", old_decl);
1136 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1137 Otherwise issue diagnostics. */
1140 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1142 old_decl = STRIP_TEMPLATE (old_decl);
1143 new_decl = STRIP_TEMPLATE (new_decl);
1144 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1145 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1147 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1148 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1150 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1152 /* Hide a built-in declaration. */
1153 DECL_DECLARED_CONSTEXPR_P (old_decl)
1154 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1157 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1158 error ("from previous declaration %q+D", old_decl);
1162 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1163 && lookup_attribute ("gnu_inline", \
1164 DECL_ATTRIBUTES (fn)))
1166 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1167 If the redeclaration is invalid, a diagnostic is issued, and the
1168 error_mark_node is returned. Otherwise, OLDDECL is returned.
1170 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1173 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1176 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1178 unsigned olddecl_uid = DECL_UID (olddecl);
1179 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1180 int new_defines_function = 0;
1181 tree new_template_info;
1183 if (newdecl == olddecl)
1186 types_match = decls_match (newdecl, olddecl);
1188 /* If either the type of the new decl or the type of the old decl is an
1189 error_mark_node, then that implies that we have already issued an
1190 error (earlier) for some bogus type specification, and in that case,
1191 it is rather pointless to harass the user with yet more error message
1192 about the same declaration, so just pretend the types match here. */
1193 if (TREE_TYPE (newdecl) == error_mark_node
1194 || TREE_TYPE (olddecl) == error_mark_node)
1195 return error_mark_node;
1197 if (DECL_P (olddecl)
1198 && TREE_CODE (newdecl) == FUNCTION_DECL
1199 && TREE_CODE (olddecl) == FUNCTION_DECL
1200 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1202 if (DECL_DECLARED_INLINE_P (newdecl)
1203 && DECL_UNINLINABLE (newdecl)
1204 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1205 /* Already warned elsewhere. */;
1206 else if (DECL_DECLARED_INLINE_P (olddecl)
1207 && DECL_UNINLINABLE (olddecl)
1208 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1209 /* Already warned. */;
1210 else if (DECL_DECLARED_INLINE_P (newdecl)
1211 && DECL_UNINLINABLE (olddecl)
1212 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1214 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1216 warning (OPT_Wattributes, "previous declaration of %q+D "
1217 "with attribute noinline", olddecl);
1219 else if (DECL_DECLARED_INLINE_P (olddecl)
1220 && DECL_UNINLINABLE (newdecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared with "
1224 "attribute noinline", newdecl);
1225 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1230 /* Check for redeclaration and other discrepancies. */
1231 if (TREE_CODE (olddecl) == FUNCTION_DECL
1232 && DECL_ARTIFICIAL (olddecl))
1234 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1235 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1237 /* Avoid warnings redeclaring built-ins which have not been
1238 explicitly declared. */
1239 if (DECL_ANTICIPATED (olddecl))
1242 /* If you declare a built-in or predefined function name as static,
1243 the old definition is overridden, but optionally warn this was a
1244 bad choice of name. */
1245 if (! TREE_PUBLIC (newdecl))
1247 warning (OPT_Wshadow,
1248 DECL_BUILT_IN (olddecl)
1249 ? G_("shadowing built-in function %q#D")
1250 : G_("shadowing library function %q#D"), olddecl);
1251 /* Discard the old built-in function. */
1254 /* If the built-in is not ansi, then programs can override
1255 it even globally without an error. */
1256 else if (! DECL_BUILT_IN (olddecl))
1257 warning (0, "library function %q#D redeclared as non-function %q#D",
1261 error ("declaration of %q#D", newdecl);
1262 error ("conflicts with built-in declaration %q#D",
1267 else if (!types_match)
1269 /* Avoid warnings redeclaring built-ins which have not been
1270 explicitly declared. */
1271 if (DECL_ANTICIPATED (olddecl))
1273 /* Deal with fileptr_type_node. FILE type is not known
1274 at the time we create the builtins. */
1277 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1278 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1280 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1283 else if (TREE_VALUE (t2) == fileptr_type_node)
1285 tree t = TREE_VALUE (t1);
1287 if (TREE_CODE (t) == POINTER_TYPE
1288 && TYPE_NAME (TREE_TYPE (t))
1289 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1290 == get_identifier ("FILE")
1291 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1293 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1295 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1296 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1297 types_match = decls_match (newdecl, olddecl);
1299 return duplicate_decls (newdecl, olddecl,
1301 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1304 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1307 else if ((DECL_EXTERN_C_P (newdecl)
1308 && DECL_EXTERN_C_P (olddecl))
1309 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1312 /* A near match; override the builtin. */
1314 if (TREE_PUBLIC (newdecl))
1316 warning (0, "new declaration %q#D", newdecl);
1317 warning (0, "ambiguates built-in declaration %q#D",
1321 warning (OPT_Wshadow,
1322 DECL_BUILT_IN (olddecl)
1323 ? G_("shadowing built-in function %q#D")
1324 : G_("shadowing library function %q#D"), olddecl);
1327 /* Discard the old built-in function. */
1330 /* Replace the old RTL to avoid problems with inlining. */
1331 COPY_DECL_RTL (newdecl, olddecl);
1333 /* Even if the types match, prefer the new declarations type for
1334 built-ins which have not been explicitly declared, for
1335 exception lists, etc... */
1336 else if (DECL_IS_BUILTIN (olddecl))
1338 tree type = TREE_TYPE (newdecl);
1339 tree attribs = (*targetm.merge_type_attributes)
1340 (TREE_TYPE (olddecl), type);
1342 type = cp_build_type_attribute_variant (type, attribs);
1343 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1346 /* If a function is explicitly declared "throw ()", propagate that to
1347 the corresponding builtin. */
1348 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1349 && DECL_ANTICIPATED (olddecl)
1350 && TREE_NOTHROW (newdecl)
1351 && !TREE_NOTHROW (olddecl)
1352 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1353 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1355 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1357 /* Whether or not the builtin can throw exceptions has no
1358 bearing on this declarator. */
1359 TREE_NOTHROW (olddecl) = 0;
1361 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1363 /* If a builtin function is redeclared as `static', merge
1364 the declarations, but make the original one static. */
1365 DECL_THIS_STATIC (olddecl) = 1;
1366 TREE_PUBLIC (olddecl) = 0;
1368 /* Make the old declaration consistent with the new one so
1369 that all remnants of the builtin-ness of this function
1370 will be banished. */
1371 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1372 COPY_DECL_RTL (newdecl, olddecl);
1375 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1377 /* C++ Standard, 3.3, clause 4:
1378 "[Note: a namespace name or a class template name must be unique
1379 in its declarative region (7.3.2, clause 14). ]" */
1380 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1381 && TREE_CODE (newdecl) != NAMESPACE_DECL
1382 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1383 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1384 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1385 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1387 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1388 && TREE_CODE (newdecl) != TYPE_DECL)
1389 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1390 && TREE_CODE (olddecl) != TYPE_DECL))
1392 /* We do nothing special here, because C++ does such nasty
1393 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1394 get shadowed, and know that if we need to find a TYPE_DECL
1395 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1396 slot of the identifier. */
1400 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1401 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1402 || (TREE_CODE (olddecl) == FUNCTION_DECL
1403 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1407 error ("%q#D redeclared as different kind of symbol", newdecl);
1408 if (TREE_CODE (olddecl) == TREE_LIST)
1409 olddecl = TREE_VALUE (olddecl);
1410 error ("previous declaration of %q+#D", olddecl);
1412 return error_mark_node;
1414 else if (!types_match)
1416 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1417 /* These are certainly not duplicate declarations; they're
1418 from different scopes. */
1421 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1423 /* The name of a class template may not be declared to refer to
1424 any other template, class, function, object, namespace, value,
1425 or type in the same scope. */
1426 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1427 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1429 error ("declaration of template %q#D", newdecl);
1430 error ("conflicts with previous declaration %q+#D", olddecl);
1432 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1433 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1434 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1435 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1436 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1437 DECL_TEMPLATE_PARMS (olddecl))
1438 /* Template functions can be disambiguated by
1440 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1441 TREE_TYPE (TREE_TYPE (olddecl))))
1443 error ("new declaration %q#D", newdecl);
1444 error ("ambiguates old declaration %q+#D", olddecl);
1448 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1450 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1452 error ("declaration of C function %q#D conflicts with",
1454 error ("previous declaration %q+#D here", olddecl);
1456 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1457 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1459 error ("new declaration %q#D", newdecl);
1460 error ("ambiguates old declaration %q+#D", olddecl);
1461 return error_mark_node;
1468 error ("conflicting declaration %q#D", newdecl);
1469 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1470 return error_mark_node;
1473 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1474 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1475 && (!DECL_TEMPLATE_INFO (newdecl)
1476 || (DECL_TI_TEMPLATE (newdecl)
1477 != DECL_TI_TEMPLATE (olddecl))))
1478 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1479 && (!DECL_TEMPLATE_INFO (olddecl)
1480 || (DECL_TI_TEMPLATE (olddecl)
1481 != DECL_TI_TEMPLATE (newdecl))))))
1482 /* It's OK to have a template specialization and a non-template
1483 with the same type, or to have specializations of two
1484 different templates with the same type. Note that if one is a
1485 specialization, and the other is an instantiation of the same
1486 template, that we do not exit at this point. That situation
1487 can occur if we instantiate a template class, and then
1488 specialize one of its methods. This situation is valid, but
1489 the declarations must be merged in the usual way. */
1491 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1492 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1493 && !DECL_USE_TEMPLATE (newdecl))
1494 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1495 && !DECL_USE_TEMPLATE (olddecl))))
1496 /* One of the declarations is a template instantiation, and the
1497 other is not a template at all. That's OK. */
1499 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1501 /* In [namespace.alias] we have:
1503 In a declarative region, a namespace-alias-definition can be
1504 used to redefine a namespace-alias declared in that declarative
1505 region to refer only to the namespace to which it already
1508 Therefore, if we encounter a second alias directive for the same
1509 alias, we can just ignore the second directive. */
1510 if (DECL_NAMESPACE_ALIAS (newdecl)
1511 && (DECL_NAMESPACE_ALIAS (newdecl)
1512 == DECL_NAMESPACE_ALIAS (olddecl)))
1514 /* [namespace.alias]
1516 A namespace-name or namespace-alias shall not be declared as
1517 the name of any other entity in the same declarative region.
1518 A namespace-name defined at global scope shall not be
1519 declared as the name of any other entity in any global scope
1521 error ("declaration of namespace %qD conflicts with", newdecl);
1522 error ("previous declaration of namespace %q+D here", olddecl);
1523 return error_mark_node;
1527 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1530 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1531 if (DECL_NAME (olddecl) != NULL_TREE)
1532 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1533 ? "%q+#D previously defined here"
1534 : "%q+#D previously declared here", olddecl);
1535 return error_mark_node;
1537 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1538 && DECL_INITIAL (olddecl) != NULL_TREE
1539 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1540 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1542 /* Prototype decl follows defn w/o prototype. */
1543 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1544 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1545 "follows non-prototype definition here");
1547 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1548 || TREE_CODE (olddecl) == VAR_DECL)
1549 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1552 If two declarations of the same function or object
1553 specify different linkage-specifications ..., the program
1554 is ill-formed.... Except for functions with C++ linkage,
1555 a function declaration without a linkage specification
1556 shall not precede the first linkage specification for
1557 that function. A function can be declared without a
1558 linkage specification after an explicit linkage
1559 specification has been seen; the linkage explicitly
1560 specified in the earlier declaration is not affected by
1561 such a function declaration.
1563 DR 563 raises the question why the restrictions on
1564 functions should not also apply to objects. Older
1565 versions of G++ silently ignore the linkage-specification
1573 which is clearly wrong. Therefore, we now treat objects
1575 if (current_lang_depth () == 0)
1577 /* There is no explicit linkage-specification, so we use
1578 the linkage from the previous declaration. */
1579 if (!DECL_LANG_SPECIFIC (newdecl))
1580 retrofit_lang_decl (newdecl);
1581 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1585 error ("previous declaration of %q+#D with %qL linkage",
1586 olddecl, DECL_LANGUAGE (olddecl));
1587 error ("conflicts with new declaration with %qL linkage",
1588 DECL_LANGUAGE (newdecl));
1592 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1594 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1596 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1597 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1600 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1601 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1603 for (; t1 && t1 != void_list_node;
1604 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1605 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1607 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1610 permerror (input_location, "default argument given for parameter %d of %q#D",
1612 permerror (input_location, "after previous specification in %q+#D", olddecl);
1616 error ("default argument given for parameter %d of %q#D",
1618 error ("after previous specification in %q+#D",
1625 /* Do not merge an implicit typedef with an explicit one. In:
1629 typedef class A A __attribute__ ((foo));
1631 the attribute should apply only to the typedef. */
1632 if (TREE_CODE (olddecl) == TYPE_DECL
1633 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1634 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1637 /* If new decl is `static' and an `extern' was seen previously,
1639 warn_extern_redeclared_static (newdecl, olddecl);
1641 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1642 return error_mark_node;
1644 /* We have committed to returning 1 at this point. */
1645 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1647 /* Now that functions must hold information normally held
1648 by field decls, there is extra work to do so that
1649 declaration information does not get destroyed during
1651 if (DECL_VINDEX (olddecl))
1652 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1653 if (DECL_CONTEXT (olddecl))
1654 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1655 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1656 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1657 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1658 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1659 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1660 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1661 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1662 SET_OVERLOADED_OPERATOR_CODE
1663 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1664 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1666 /* Optionally warn about more than one declaration for the same
1667 name, but don't warn about a function declaration followed by a
1669 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1670 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1671 /* Don't warn about extern decl followed by definition. */
1672 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1673 /* Don't warn about friends, let add_friend take care of it. */
1674 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1676 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1677 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1680 if (DECL_DELETED_FN (newdecl))
1682 error ("deleted definition of %qD", newdecl);
1683 error ("after previous declaration %q+D", olddecl);
1687 /* Deal with C++: must preserve virtual function table size. */
1688 if (TREE_CODE (olddecl) == TYPE_DECL)
1690 tree newtype = TREE_TYPE (newdecl);
1691 tree oldtype = TREE_TYPE (olddecl);
1693 if (newtype != error_mark_node && oldtype != error_mark_node
1694 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1695 CLASSTYPE_FRIEND_CLASSES (newtype)
1696 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1698 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1701 /* Copy all the DECL_... slots specified in the new decl
1702 except for any that we copy here from the old type. */
1703 DECL_ATTRIBUTES (newdecl)
1704 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1706 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1710 old_result = DECL_TEMPLATE_RESULT (olddecl);
1711 new_result = DECL_TEMPLATE_RESULT (newdecl);
1712 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1713 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1714 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1715 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1717 DECL_ATTRIBUTES (old_result)
1718 = (*targetm.merge_decl_attributes) (old_result, new_result);
1720 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1722 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1723 && DECL_INITIAL (new_result))
1725 if (DECL_INITIAL (old_result))
1726 DECL_UNINLINABLE (old_result) = 1;
1728 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1729 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1730 DECL_NOT_REALLY_EXTERN (old_result)
1731 = DECL_NOT_REALLY_EXTERN (new_result);
1732 DECL_INTERFACE_KNOWN (old_result)
1733 = DECL_INTERFACE_KNOWN (new_result);
1734 DECL_DECLARED_INLINE_P (old_result)
1735 = DECL_DECLARED_INLINE_P (new_result);
1736 DECL_DISREGARD_INLINE_LIMITS (old_result)
1737 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1742 DECL_DECLARED_INLINE_P (old_result)
1743 |= DECL_DECLARED_INLINE_P (new_result);
1744 DECL_DISREGARD_INLINE_LIMITS (old_result)
1745 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1746 check_redeclaration_exception_specification (newdecl, olddecl);
1750 /* If the new declaration is a definition, update the file and
1751 line information on the declaration, and also make
1752 the old declaration the same definition. */
1753 if (DECL_INITIAL (new_result) != NULL_TREE)
1755 DECL_SOURCE_LOCATION (olddecl)
1756 = DECL_SOURCE_LOCATION (old_result)
1757 = DECL_SOURCE_LOCATION (newdecl);
1758 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1759 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1762 DECL_ARGUMENTS (old_result)
1763 = DECL_ARGUMENTS (new_result);
1764 for (parm = DECL_ARGUMENTS (old_result); parm;
1765 parm = DECL_CHAIN (parm))
1766 DECL_CONTEXT (parm) = old_result;
1775 /* Automatically handles default parameters. */
1776 tree oldtype = TREE_TYPE (olddecl);
1779 /* Merge the data types specified in the two decls. */
1780 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1782 /* If merge_types produces a non-typedef type, just use the old type. */
1783 if (TREE_CODE (newdecl) == TYPE_DECL
1784 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1787 if (TREE_CODE (newdecl) == VAR_DECL)
1789 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1790 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1791 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1792 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1793 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1794 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1796 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1797 if (DECL_LANG_SPECIFIC (olddecl)
1798 && CP_DECL_THREADPRIVATE_P (olddecl))
1800 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1801 if (!DECL_LANG_SPECIFIC (newdecl))
1802 retrofit_lang_decl (newdecl);
1804 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1805 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1809 /* Do this after calling `merge_types' so that default
1810 parameters don't confuse us. */
1811 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1812 check_redeclaration_exception_specification (newdecl, olddecl);
1813 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1815 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1816 check_default_args (newdecl);
1818 /* Lay the type out, unless already done. */
1819 if (! same_type_p (newtype, oldtype)
1820 && TREE_TYPE (newdecl) != error_mark_node
1821 && !(processing_template_decl && uses_template_parms (newdecl)))
1822 layout_type (TREE_TYPE (newdecl));
1824 if ((TREE_CODE (newdecl) == VAR_DECL
1825 || TREE_CODE (newdecl) == PARM_DECL
1826 || TREE_CODE (newdecl) == RESULT_DECL
1827 || TREE_CODE (newdecl) == FIELD_DECL
1828 || TREE_CODE (newdecl) == TYPE_DECL)
1829 && !(processing_template_decl && uses_template_parms (newdecl)))
1830 layout_decl (newdecl, 0);
1832 /* Merge the type qualifiers. */
1833 if (TREE_READONLY (newdecl))
1834 TREE_READONLY (olddecl) = 1;
1835 if (TREE_THIS_VOLATILE (newdecl))
1836 TREE_THIS_VOLATILE (olddecl) = 1;
1837 if (TREE_NOTHROW (newdecl))
1838 TREE_NOTHROW (olddecl) = 1;
1840 /* Merge deprecatedness. */
1841 if (TREE_DEPRECATED (newdecl))
1842 TREE_DEPRECATED (olddecl) = 1;
1844 /* Preserve function specific target and optimization options */
1845 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1848 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1849 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1850 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1852 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1853 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1854 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1855 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1858 /* Merge the initialization information. */
1859 if (DECL_INITIAL (newdecl) == NULL_TREE
1860 && DECL_INITIAL (olddecl) != NULL_TREE)
1862 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1863 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1864 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1866 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1867 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1871 /* Merge the section attribute.
1872 We want to issue an error if the sections conflict but that must be
1873 done later in decl_attributes since we are called before attributes
1875 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1876 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1881 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1882 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1883 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1884 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1885 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1886 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1887 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1888 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1889 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1890 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1891 /* Keep the old RTL. */
1892 COPY_DECL_RTL (olddecl, newdecl);
1894 else if (TREE_CODE (newdecl) == VAR_DECL
1895 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1897 /* Keep the old RTL. We cannot keep the old RTL if the old
1898 declaration was for an incomplete object and the new
1899 declaration is not since many attributes of the RTL will
1901 COPY_DECL_RTL (olddecl, newdecl);
1904 /* If cannot merge, then use the new type and qualifiers,
1905 and don't preserve the old rtl. */
1908 /* Clean out any memory we had of the old declaration. */
1909 tree oldstatic = value_member (olddecl, static_aggregates);
1911 TREE_VALUE (oldstatic) = error_mark_node;
1913 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1914 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1915 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1916 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1919 /* Merge the storage class information. */
1920 merge_weak (newdecl, olddecl);
1922 if (DECL_ONE_ONLY (olddecl))
1923 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1925 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1926 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1927 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1928 if (! DECL_EXTERNAL (olddecl))
1929 DECL_EXTERNAL (newdecl) = 0;
1931 new_template_info = NULL_TREE;
1932 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1934 bool new_redefines_gnu_inline = false;
1936 if (new_defines_function
1937 && ((DECL_INTERFACE_KNOWN (olddecl)
1938 && TREE_CODE (olddecl) == FUNCTION_DECL)
1939 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1940 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1941 == FUNCTION_DECL))))
1945 if (TREE_CODE (fn) == TEMPLATE_DECL)
1946 fn = DECL_TEMPLATE_RESULT (olddecl);
1948 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1951 if (!new_redefines_gnu_inline)
1953 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1954 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1955 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1957 DECL_TEMPLATE_INSTANTIATED (newdecl)
1958 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1959 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1961 /* If the OLDDECL is an instantiation and/or specialization,
1962 then the NEWDECL must be too. But, it may not yet be marked
1963 as such if the caller has created NEWDECL, but has not yet
1964 figured out that it is a redeclaration. */
1965 if (!DECL_USE_TEMPLATE (newdecl))
1966 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1968 /* Don't really know how much of the language-specific
1969 values we should copy from old to new. */
1970 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1971 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1972 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1973 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1975 if (LANG_DECL_HAS_MIN (newdecl))
1977 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1978 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1979 if (DECL_TEMPLATE_INFO (newdecl))
1980 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1981 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1983 /* Only functions have these fields. */
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL
1985 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1987 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1988 olddecl_friend = DECL_FRIEND_P (olddecl);
1989 hidden_friend = (DECL_ANTICIPATED (olddecl)
1990 && DECL_HIDDEN_FRIEND_P (olddecl)
1991 && newdecl_is_friend);
1992 DECL_BEFRIENDING_CLASSES (newdecl)
1993 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1994 DECL_BEFRIENDING_CLASSES (olddecl));
1995 /* DECL_THUNKS is only valid for virtual functions,
1996 otherwise it is a DECL_FRIEND_CONTEXT. */
1997 if (DECL_VIRTUAL_P (newdecl))
1998 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2000 /* Only variables have this field. */
2001 else if (TREE_CODE (newdecl) == VAR_DECL
2002 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2003 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2006 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2010 /* Merge parameter attributes. */
2011 tree oldarg, newarg;
2012 for (oldarg = DECL_ARGUMENTS(olddecl),
2013 newarg = DECL_ARGUMENTS(newdecl);
2015 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2016 DECL_ATTRIBUTES (newarg)
2017 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2018 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2021 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2022 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2024 /* If newdecl is not a specialization, then it is not a
2025 template-related function at all. And that means that we
2026 should have exited above, returning 0. */
2027 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2029 if (DECL_ODR_USED (olddecl))
2030 /* From [temp.expl.spec]:
2032 If a template, a member template or the member of a class
2033 template is explicitly specialized then that
2034 specialization shall be declared before the first use of
2035 that specialization that would cause an implicit
2036 instantiation to take place, in every translation unit in
2037 which such a use occurs. */
2038 error ("explicit specialization of %qD after first use",
2041 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2043 /* Don't propagate visibility from the template to the
2044 specialization here. We'll do that in determine_visibility if
2046 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2048 /* [temp.expl.spec/14] We don't inline explicit specialization
2049 just because the primary template says so. */
2051 else if (new_defines_function && DECL_INITIAL (olddecl))
2053 /* Never inline re-defined extern inline functions.
2054 FIXME: this could be better handled by keeping both
2055 function as separate declarations. */
2056 DECL_UNINLINABLE (newdecl) = 1;
2060 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2061 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2063 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2065 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2066 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2068 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2069 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2070 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2071 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2074 /* Preserve abstractness on cloned [cd]tors. */
2075 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2077 /* Update newdecl's parms to point at olddecl. */
2078 for (parm = DECL_ARGUMENTS (newdecl); parm;
2079 parm = DECL_CHAIN (parm))
2080 DECL_CONTEXT (parm) = olddecl;
2084 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2085 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2086 COPY_DECL_RTL (newdecl, olddecl);
2088 if (! types_match || new_defines_function)
2090 /* These need to be copied so that the names are available.
2091 Note that if the types do match, we'll preserve inline
2092 info and other bits, but if not, we won't. */
2093 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2094 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2096 if (new_defines_function)
2097 /* If defining a function declared with other language
2098 linkage, use the previously declared language linkage. */
2099 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2100 else if (types_match)
2102 /* If redeclaring a builtin function, and not a definition,
2103 it stays built in. */
2104 if (DECL_BUILT_IN (olddecl))
2106 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2107 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2108 /* If we're keeping the built-in definition, keep the rtl,
2109 regardless of declaration matches. */
2110 COPY_DECL_RTL (olddecl, newdecl);
2113 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2114 /* Don't clear out the arguments if we're just redeclaring a
2116 if (DECL_ARGUMENTS (olddecl))
2117 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2120 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2121 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2123 /* Now preserve various other info from the definition. */
2124 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2125 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2126 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2127 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2129 /* Warn about conflicting visibility specifications. */
2130 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2131 && DECL_VISIBILITY_SPECIFIED (newdecl)
2132 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2134 warning_at (input_location, OPT_Wattributes,
2135 "%q+D: visibility attribute ignored because it", newdecl);
2136 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2137 "conflicts with previous declaration here");
2139 /* Choose the declaration which specified visibility. */
2140 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2142 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2143 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2145 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2146 so keep this behavior. */
2147 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2149 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2150 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2152 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2153 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2154 if (TREE_CODE (newdecl) == FIELD_DECL)
2155 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2157 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2158 with that from NEWDECL below. */
2159 if (DECL_LANG_SPECIFIC (olddecl))
2161 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2162 != DECL_LANG_SPECIFIC (newdecl));
2163 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2166 /* Merge the USED information. */
2167 if (TREE_USED (olddecl))
2168 TREE_USED (newdecl) = 1;
2169 else if (TREE_USED (newdecl))
2170 TREE_USED (olddecl) = 1;
2171 if (TREE_CODE (newdecl) == VAR_DECL)
2173 if (DECL_READ_P (olddecl))
2174 DECL_READ_P (newdecl) = 1;
2175 else if (DECL_READ_P (newdecl))
2176 DECL_READ_P (olddecl) = 1;
2178 if (DECL_PRESERVE_P (olddecl))
2179 DECL_PRESERVE_P (newdecl) = 1;
2180 else if (DECL_PRESERVE_P (newdecl))
2181 DECL_PRESERVE_P (olddecl) = 1;
2183 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2187 function_size = sizeof (struct tree_decl_common);
2189 memcpy ((char *) olddecl + sizeof (struct tree_common),
2190 (char *) newdecl + sizeof (struct tree_common),
2191 function_size - sizeof (struct tree_common));
2193 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2194 (char *) newdecl + sizeof (struct tree_decl_common),
2195 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2196 if (new_template_info)
2197 /* If newdecl is a template instantiation, it is possible that
2198 the following sequence of events has occurred:
2200 o A friend function was declared in a class template. The
2201 class template was instantiated.
2203 o The instantiation of the friend declaration was
2204 recorded on the instantiation list, and is newdecl.
2206 o Later, however, instantiate_class_template called pushdecl
2207 on the newdecl to perform name injection. But, pushdecl in
2208 turn called duplicate_decls when it discovered that another
2209 declaration of a global function with the same name already
2212 o Here, in duplicate_decls, we decided to clobber newdecl.
2214 If we're going to do that, we'd better make sure that
2215 olddecl, and not newdecl, is on the list of
2216 instantiations so that if we try to do the instantiation
2217 again we won't get the clobbered declaration. */
2218 reregister_specialization (newdecl,
2224 size_t size = tree_code_size (TREE_CODE (olddecl));
2225 memcpy ((char *) olddecl + sizeof (struct tree_common),
2226 (char *) newdecl + sizeof (struct tree_common),
2227 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2228 switch (TREE_CODE (olddecl))
2238 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2239 (char *) newdecl + sizeof (struct tree_decl_common),
2240 size - sizeof (struct tree_decl_common)
2241 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2245 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2246 (char *) newdecl + sizeof (struct tree_decl_common),
2247 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2248 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2252 DECL_UID (olddecl) = olddecl_uid;
2254 DECL_FRIEND_P (olddecl) = 1;
2257 DECL_ANTICIPATED (olddecl) = 1;
2258 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2261 /* NEWDECL contains the merged attribute lists.
2262 Update OLDDECL to be the same. */
2263 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2265 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2266 so that encode_section_info has a chance to look at the new decl
2267 flags and attributes. */
2268 if (DECL_RTL_SET_P (olddecl)
2269 && (TREE_CODE (olddecl) == FUNCTION_DECL
2270 || (TREE_CODE (olddecl) == VAR_DECL
2271 && TREE_STATIC (olddecl))))
2272 make_decl_rtl (olddecl);
2274 /* The NEWDECL will no longer be needed. Because every out-of-class
2275 declaration of a member results in a call to duplicate_decls,
2276 freeing these nodes represents in a significant savings. */
2282 /* Return zero if the declaration NEWDECL is valid
2283 when the declaration OLDDECL (assumed to be for the same name)
2284 has already been seen.
2285 Otherwise return an error message format string with a %s
2286 where the identifier should go. */
2289 redeclaration_error_message (tree newdecl, tree olddecl)
2291 if (TREE_CODE (newdecl) == TYPE_DECL)
2293 /* Because C++ can put things into name space for free,
2294 constructs like "typedef struct foo { ... } foo"
2295 would look like an erroneous redeclaration. */
2296 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2299 return G_("redefinition of %q#D");
2301 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2303 /* If this is a pure function, its olddecl will actually be
2304 the original initialization to `0' (which we force to call
2305 abort()). Don't complain about redefinition in this case. */
2306 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2307 && DECL_INITIAL (olddecl) == NULL_TREE)
2310 /* If both functions come from different namespaces, this is not
2311 a redeclaration - this is a conflict with a used function. */
2312 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2313 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2314 && ! decls_match (olddecl, newdecl))
2315 return G_("%qD conflicts with used function");
2317 /* We'll complain about linkage mismatches in
2318 warn_extern_redeclared_static. */
2320 /* Defining the same name twice is no good. */
2321 if (DECL_INITIAL (olddecl) != NULL_TREE
2322 && DECL_INITIAL (newdecl) != NULL_TREE)
2324 if (DECL_NAME (olddecl) == NULL_TREE)
2325 return G_("%q#D not declared in class");
2326 else if (!GNU_INLINE_P (olddecl)
2327 || GNU_INLINE_P (newdecl))
2328 return G_("redefinition of %q#D");
2331 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2333 bool olda = GNU_INLINE_P (olddecl);
2334 bool newa = GNU_INLINE_P (newdecl);
2339 return G_("%q+D redeclared inline with "
2340 "%<gnu_inline%> attribute");
2342 return G_("%q+D redeclared inline without "
2343 "%<gnu_inline%> attribute");
2349 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2353 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2355 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2356 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2357 return G_("redefinition of %q#D");
2361 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2362 || (DECL_TEMPLATE_RESULT (newdecl)
2363 == DECL_TEMPLATE_RESULT (olddecl)))
2366 nt = DECL_TEMPLATE_RESULT (newdecl);
2367 if (DECL_TEMPLATE_INFO (nt))
2368 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2369 ot = DECL_TEMPLATE_RESULT (olddecl);
2370 if (DECL_TEMPLATE_INFO (ot))
2371 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2372 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2373 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2374 return G_("redefinition of %q#D");
2376 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2378 bool olda = GNU_INLINE_P (ot);
2379 bool newa = GNU_INLINE_P (nt);
2384 return G_("%q+D redeclared inline with "
2385 "%<gnu_inline%> attribute");
2387 return G_("%q+D redeclared inline without "
2388 "%<gnu_inline%> attribute");
2392 /* Core issue #226 (C++0x):
2394 If a friend function template declaration specifies a
2395 default template-argument, that declaration shall be a
2396 definition and shall be the only declaration of the
2397 function template in the translation unit. */
2398 if ((cxx_dialect != cxx98)
2399 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2400 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2401 /*is_primary=*/1, /*is_partial=*/0,
2402 /*is_friend_decl=*/2))
2403 return G_("redeclaration of friend %q#D "
2404 "may not have default template arguments");
2408 else if (TREE_CODE (newdecl) == VAR_DECL
2409 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2410 && (! DECL_LANG_SPECIFIC (olddecl)
2411 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2412 || DECL_THREAD_LOCAL_P (newdecl)))
2414 /* Only variables can be thread-local, and all declarations must
2415 agree on this property. */
2416 if (DECL_THREAD_LOCAL_P (newdecl))
2417 return G_("thread-local declaration of %q#D follows "
2418 "non-thread-local declaration");
2420 return G_("non-thread-local declaration of %q#D follows "
2421 "thread-local declaration");
2423 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2425 /* The objects have been declared at namespace scope. If either
2426 is a member of an anonymous union, then this is an invalid
2427 redeclaration. For example:
2433 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2434 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2435 return G_("redeclaration of %q#D");
2436 /* If at least one declaration is a reference, there is no
2437 conflict. For example:
2443 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2445 /* Reject two definitions. */
2446 return G_("redefinition of %q#D");
2450 /* Objects declared with block scope: */
2451 /* Reject two definitions, and reject a definition
2452 together with an external reference. */
2453 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2454 return G_("redeclaration of %q#D");
2459 /* Hash and equality functions for the named_label table. */
2462 named_label_entry_hash (const void *data)
2464 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2465 return DECL_UID (ent->label_decl);
2469 named_label_entry_eq (const void *a, const void *b)
2471 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2472 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2473 return ent_a->label_decl == ent_b->label_decl;
2476 /* Create a new label, named ID. */
2479 make_label_decl (tree id, int local_p)
2481 struct named_label_entry *ent;
2485 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2487 DECL_CONTEXT (decl) = current_function_decl;
2488 DECL_MODE (decl) = VOIDmode;
2489 C_DECLARED_LABEL_FLAG (decl) = local_p;
2491 /* Say where one reference is to the label, for the sake of the
2492 error if it is not defined. */
2493 DECL_SOURCE_LOCATION (decl) = input_location;
2495 /* Record the fact that this identifier is bound to this label. */
2496 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2498 /* Create the label htab for the function on demand. */
2500 named_labels = htab_create_ggc (13, named_label_entry_hash,
2501 named_label_entry_eq, NULL);
2503 /* Record this label on the list of labels used in this function.
2504 We do this before calling make_label_decl so that we get the
2505 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2506 ent = ggc_alloc_cleared_named_label_entry ();
2507 ent->label_decl = decl;
2509 slot = htab_find_slot (named_labels, ent, INSERT);
2510 gcc_assert (*slot == NULL);
2516 /* Look for a label named ID in the current function. If one cannot
2517 be found, create one. (We keep track of used, but undefined,
2518 labels, and complain about them at the end of a function.) */
2521 lookup_label (tree id)
2525 timevar_push (TV_NAME_LOOKUP);
2526 /* You can't use labels at global scope. */
2527 if (current_function_decl == NULL_TREE)
2529 error ("label %qE referenced outside of any function", id);
2530 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2533 /* See if we've already got this label. */
2534 decl = IDENTIFIER_LABEL_VALUE (id);
2535 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2536 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2538 decl = make_label_decl (id, /*local_p=*/0);
2539 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2542 /* Declare a local label named ID. */
2545 declare_local_label (tree id)
2548 cp_label_binding *bind;
2550 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2551 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2552 bind = VEC_safe_push (cp_label_binding, gc,
2553 current_binding_level->shadowed_labels, NULL);
2554 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2556 decl = make_label_decl (id, /*local_p=*/1);
2562 /* Returns nonzero if it is ill-formed to jump past the declaration of
2563 DECL. Returns 2 if it's also a real problem. */
2566 decl_jump_unsafe (tree decl)
2568 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2569 with automatic storage duration is not in scope to a point where it is
2570 in scope is ill-formed unless the variable has scalar type, class type
2571 with a trivial default constructor and a trivial destructor, a
2572 cv-qualified version of one of these types, or an array of one of the
2573 preceding types and is declared without an initializer (8.5). */
2574 tree type = TREE_TYPE (decl);
2576 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2577 || type == error_mark_node)
2580 type = strip_array_types (type);
2582 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2583 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2586 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2592 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2595 identify_goto (tree decl, const location_t *locus)
2598 permerror (input_location, "jump to label %qD", decl);
2600 permerror (input_location, "jump to case label");
2602 permerror (*locus, " from here");
2605 /* Check that a single previously seen jump to a newly defined label
2606 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2607 the jump context; NAMES are the names in scope in LEVEL at the jump
2608 context; LOCUS is the source position of the jump or 0. Returns
2609 true if all is well. */
2612 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2613 bool exited_omp, const location_t *locus)
2615 struct cp_binding_level *b;
2616 bool identified = false, saw_eh = false, saw_omp = false;
2620 identify_goto (decl, locus);
2621 error (" exits OpenMP structured block");
2622 identified = saw_omp = true;
2625 for (b = current_binding_level; b ; b = b->level_chain)
2627 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2629 for (new_decls = b->names; new_decls != old_decls;
2630 new_decls = DECL_CHAIN (new_decls))
2632 int problem = decl_jump_unsafe (new_decls);
2638 identify_goto (decl, locus);
2642 error (" crosses initialization of %q+#D", new_decls);
2644 permerror (input_location, " enters scope of %q+#D which has "
2645 "non-trivial destructor", new_decls);
2650 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2654 identify_goto (decl, locus);
2657 if (b->kind == sk_try)
2658 error (" enters try block");
2660 error (" enters catch block");
2663 if (b->kind == sk_omp && !saw_omp)
2667 identify_goto (decl, locus);
2670 error (" enters OpenMP structured block");
2679 check_previous_goto (tree decl, struct named_label_use_entry *use)
2681 check_previous_goto_1 (decl, use->binding_level,
2682 use->names_in_scope, use->in_omp_scope,
2683 &use->o_goto_locus);
2687 check_switch_goto (struct cp_binding_level* level)
2689 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2692 /* Check that a new jump to a label DECL is OK. Called by
2693 finish_goto_stmt. */
2696 check_goto (tree decl)
2698 struct named_label_entry *ent, dummy;
2699 bool saw_catch = false, identified = false;
2703 /* We can't know where a computed goto is jumping.
2704 So we assume that it's OK. */
2705 if (TREE_CODE (decl) != LABEL_DECL)
2708 /* We didn't record any information about this label when we created it,
2709 and there's not much point since it's trivial to analyze as a return. */
2710 if (decl == cdtor_label)
2713 dummy.label_decl = decl;
2714 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2715 gcc_assert (ent != NULL);
2717 /* If the label hasn't been defined yet, defer checking. */
2718 if (! DECL_INITIAL (decl))
2720 struct named_label_use_entry *new_use;
2722 /* Don't bother creating another use if the last goto had the
2723 same data, and will therefore create the same set of errors. */
2725 && ent->uses->names_in_scope == current_binding_level->names)
2728 new_use = ggc_alloc_named_label_use_entry ();
2729 new_use->binding_level = current_binding_level;
2730 new_use->names_in_scope = current_binding_level->names;
2731 new_use->o_goto_locus = input_location;
2732 new_use->in_omp_scope = false;
2734 new_use->next = ent->uses;
2735 ent->uses = new_use;
2739 if (ent->in_try_scope || ent->in_catch_scope
2740 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2742 permerror (input_location, "jump to label %q+D", decl);
2743 permerror (input_location, " from here");
2747 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2749 int u = decl_jump_unsafe (bad);
2751 if (u > 1 && DECL_ARTIFICIAL (bad))
2753 /* Can't skip init of __exception_info. */
2754 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2758 error (" skips initialization of %q+#D", bad);
2760 permerror (input_location, " enters scope of %q+#D which has "
2761 "non-trivial destructor", bad);
2764 if (ent->in_try_scope)
2765 error (" enters try block");
2766 else if (ent->in_catch_scope && !saw_catch)
2767 error (" enters catch block");
2769 if (ent->in_omp_scope)
2770 error (" enters OpenMP structured block");
2771 else if (flag_openmp)
2773 struct cp_binding_level *b;
2774 for (b = current_binding_level; b ; b = b->level_chain)
2776 if (b == ent->binding_level)
2778 if (b->kind == sk_omp)
2782 permerror (input_location, "jump to label %q+D", decl);
2783 permerror (input_location, " from here");
2786 error (" exits OpenMP structured block");
2793 /* Check that a return is ok wrt OpenMP structured blocks.
2794 Called by finish_return_stmt. Returns true if all is well. */
2797 check_omp_return (void)
2799 struct cp_binding_level *b;
2800 for (b = current_binding_level; b ; b = b->level_chain)
2801 if (b->kind == sk_omp)
2803 error ("invalid exit from OpenMP structured block");
2809 /* Define a label, specifying the location in the source file.
2810 Return the LABEL_DECL node for the label. */
2813 define_label (location_t location, tree name)
2815 struct named_label_entry *ent, dummy;
2816 struct cp_binding_level *p;
2819 timevar_push (TV_NAME_LOOKUP);
2821 decl = lookup_label (name);
2823 dummy.label_decl = decl;
2824 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2825 gcc_assert (ent != NULL);
2827 /* After labels, make any new cleanups in the function go into their
2828 own new (temporary) binding contour. */
2829 for (p = current_binding_level;
2830 p->kind != sk_function_parms;
2832 p->more_cleanups_ok = 0;
2834 if (name == get_identifier ("wchar_t"))
2835 permerror (input_location, "label named wchar_t");
2837 if (DECL_INITIAL (decl) != NULL_TREE)
2839 error ("duplicate label %qD", decl);
2840 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2844 struct named_label_use_entry *use;
2846 /* Mark label as having been defined. */
2847 DECL_INITIAL (decl) = error_mark_node;
2848 /* Say where in the source. */
2849 DECL_SOURCE_LOCATION (decl) = location;
2851 ent->binding_level = current_binding_level;
2852 ent->names_in_scope = current_binding_level->names;
2854 for (use = ent->uses; use ; use = use->next)
2855 check_previous_goto (decl, use);
2859 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2864 struct cp_binding_level *level;
2865 struct cp_switch *next;
2866 /* The SWITCH_STMT being built. */
2868 /* A splay-tree mapping the low element of a case range to the high
2869 element, or NULL_TREE if there is no high element. Used to
2870 determine whether or not a new case label duplicates an old case
2871 label. We need a tree, rather than simply a hash table, because
2872 of the GNU case range extension. */
2876 /* A stack of the currently active switch statements. The innermost
2877 switch statement is on the top of the stack. There is no need to
2878 mark the stack for garbage collection because it is only active
2879 during the processing of the body of a function, and we never
2880 collect at that point. */
2882 static struct cp_switch *switch_stack;
2884 /* Called right after a switch-statement condition is parsed.
2885 SWITCH_STMT is the switch statement being parsed. */
2888 push_switch (tree switch_stmt)
2890 struct cp_switch *p = XNEW (struct cp_switch);
2891 p->level = current_binding_level;
2892 p->next = switch_stack;
2893 p->switch_stmt = switch_stmt;
2894 p->cases = splay_tree_new (case_compare, NULL, NULL);
2901 struct cp_switch *cs = switch_stack;
2902 location_t switch_location;
2904 /* Emit warnings as needed. */
2905 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2906 if (!processing_template_decl)
2907 c_do_switch_warnings (cs->cases, switch_location,
2908 SWITCH_STMT_TYPE (cs->switch_stmt),
2909 SWITCH_STMT_COND (cs->switch_stmt));
2911 splay_tree_delete (cs->cases);
2912 switch_stack = switch_stack->next;
2916 /* Note that we've seen a definition of a case label, and complain if this
2917 is a bad place for one. */
2920 finish_case_label (location_t loc, tree low_value, tree high_value)
2923 struct cp_binding_level *p;
2925 if (processing_template_decl)
2929 /* For templates, just add the case label; we'll do semantic
2930 analysis at instantiation-time. */
2931 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2932 return add_stmt (build_case_label (loc, low_value, high_value, label));
2935 /* Find the condition on which this switch statement depends. */
2936 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2937 if (cond && TREE_CODE (cond) == TREE_LIST)
2938 cond = TREE_VALUE (cond);
2940 if (!check_switch_goto (switch_stack->level))
2941 return error_mark_node;
2944 low_value = cxx_constant_value (low_value);
2946 high_value = cxx_constant_value (high_value);
2948 r = c_add_case_label (loc, switch_stack->cases, cond,
2949 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2950 low_value, high_value);
2952 /* After labels, make any new cleanups in the function go into their
2953 own new (temporary) binding contour. */
2954 for (p = current_binding_level;
2955 p->kind != sk_function_parms;
2957 p->more_cleanups_ok = 0;
2962 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2965 typename_hash (const void* k)
2968 const_tree const t = (const_tree) k;
2970 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2971 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2976 typedef struct typename_info {
2984 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2985 really of type `typename_info*' */
2988 typename_compare (const void * k1, const void * k2)
2990 const_tree const t1 = (const_tree) k1;
2991 const typename_info *const t2 = (const typename_info *) k2;
2993 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2994 && TYPE_CONTEXT (t1) == t2->scope
2995 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2996 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2997 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3000 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3001 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3003 Returns the new TYPENAME_TYPE. */
3005 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3008 build_typename_type (tree context, tree name, tree fullname,
3009 enum tag_types tag_type)
3017 if (typename_htab == NULL)
3018 typename_htab = htab_create_ggc (61, &typename_hash,
3019 &typename_compare, NULL);
3021 ti.scope = FROB_CONTEXT (context);
3023 ti.template_id = fullname;
3024 ti.enum_p = tag_type == enum_type;
3025 ti.class_p = (tag_type == class_type
3026 || tag_type == record_type
3027 || tag_type == union_type);
3028 hash = (htab_hash_pointer (ti.scope)
3029 ^ htab_hash_pointer (ti.name));
3031 /* See if we already have this type. */
3032 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3037 /* Build the TYPENAME_TYPE. */
3038 t = cxx_make_type (TYPENAME_TYPE);
3039 TYPE_CONTEXT (t) = ti.scope;
3040 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3041 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3042 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3044 /* Build the corresponding TYPE_DECL. */
3045 d = build_decl (input_location, TYPE_DECL, name, t);
3046 TYPE_NAME (TREE_TYPE (d)) = d;
3047 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3048 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3049 DECL_ARTIFICIAL (d) = 1;
3051 /* Store it in the hash table. */
3054 /* TYPENAME_TYPEs must always be compared structurally, because
3055 they may or may not resolve down to another type depending on
3056 the currently open classes. */
3057 SET_TYPE_STRUCTURAL_EQUALITY (t);
3063 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3064 provided to name the type. Returns an appropriate type, unless an
3065 error occurs, in which case error_mark_node is returned. If we
3066 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3067 return that, rather than the _TYPE it corresponds to, in other
3068 cases we look through the type decl. If TF_ERROR is set, complain
3069 about errors, otherwise be quiet. */
3072 make_typename_type (tree context, tree name, enum tag_types tag_type,
3073 tsubst_flags_t complain)
3079 if (name == error_mark_node
3080 || context == NULL_TREE
3081 || context == error_mark_node)
3082 return error_mark_node;
3086 if (!(TYPE_LANG_SPECIFIC (name)
3087 && (CLASSTYPE_IS_TEMPLATE (name)
3088 || CLASSTYPE_USE_TEMPLATE (name))))
3089 name = TYPE_IDENTIFIER (name);
3091 /* Create a TEMPLATE_ID_EXPR for the type. */
3092 name = build_nt (TEMPLATE_ID_EXPR,
3093 CLASSTYPE_TI_TEMPLATE (name),
3094 CLASSTYPE_TI_ARGS (name));
3096 else if (TREE_CODE (name) == TYPE_DECL)
3097 name = DECL_NAME (name);
3101 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3103 name = TREE_OPERAND (name, 0);
3104 if (TREE_CODE (name) == TEMPLATE_DECL)
3105 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3106 else if (TREE_CODE (name) == OVERLOAD)
3108 error ("%qD is not a type", name);
3109 return error_mark_node;
3112 if (TREE_CODE (name) == TEMPLATE_DECL)
3114 error ("%qD used without template parameters", name);
3115 return error_mark_node;
3117 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3118 gcc_assert (TYPE_P (context));
3120 if (!MAYBE_CLASS_TYPE_P (context))
3122 if (complain & tf_error)
3123 error ("%q#T is not a class", context);
3124 return error_mark_node;
3127 /* When the CONTEXT is a dependent type, NAME could refer to a
3128 dependent base class of CONTEXT. But look inside it anyway
3129 if CONTEXT is a currently open scope, in case it refers to a
3130 member of the current instantiation or a non-dependent base;
3131 lookup will stop when we hit a dependent base. */
3132 if (!dependent_scope_p (context))
3133 /* We should only set WANT_TYPE when we're a nested typename type.
3134 Then we can give better diagnostics if we find a non-type. */
3135 t = lookup_field (context, name, 2, /*want_type=*/true);
3139 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3140 return build_typename_type (context, name, fullname, tag_type);
3142 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3146 if (complain & tf_error)
3147 error (want_template ? "no class template named %q#T in %q#T"
3148 : "no type named %q#T in %q#T", name, context);
3149 return error_mark_node;
3152 /* Pull out the template from an injected-class-name (or multiple). */
3154 t = maybe_get_template_decl_from_type_decl (t);
3156 if (TREE_CODE (t) == TREE_LIST)
3158 if (complain & tf_error)
3160 error ("lookup of %qT in %qT is ambiguous", name, context);
3161 print_candidates (t);
3163 return error_mark_node;
3166 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3168 if (complain & tf_error)
3169 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3171 return error_mark_node;
3173 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3175 if (complain & tf_error)
3176 error ("%<typename %T::%D%> names %q#T, which is not a type",
3178 return error_mark_node;
3181 if (complain & tf_error)
3182 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3184 /* If we are currently parsing a template and if T is a typedef accessed
3185 through CONTEXT then we need to remember and check access of T at
3186 template instantiation time. */
3187 add_typedef_to_current_template_for_access_check (t, context, input_location);
3190 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3192 /*entering_scope=*/0,
3193 tf_warning_or_error | tf_user);
3195 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3201 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3202 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3203 in which case error_mark_node is returned.
3205 If PARM_LIST is non-NULL, also make sure that the template parameter
3206 list of TEMPLATE_DECL matches.
3208 If COMPLAIN zero, don't complain about any errors that occur. */
3211 make_unbound_class_template (tree context, tree name, tree parm_list,
3212 tsubst_flags_t complain)
3218 name = TYPE_IDENTIFIER (name);
3219 else if (DECL_P (name))
3220 name = DECL_NAME (name);
3221 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3223 if (!dependent_type_p (context)
3224 || currently_open_class (context))
3226 tree tmpl = NULL_TREE;
3228 if (MAYBE_CLASS_TYPE_P (context))
3229 tmpl = lookup_field (context, name, 0, false);
3231 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3232 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3234 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3236 if (complain & tf_error)
3237 error ("no class template named %q#T in %q#T", name, context);
3238 return error_mark_node;
3242 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3244 if (complain & tf_error)
3246 error ("template parameters do not match template");
3247 error ("%q+D declared here", tmpl);
3249 return error_mark_node;
3252 if (complain & tf_error)
3253 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3258 /* Build the UNBOUND_CLASS_TEMPLATE. */
3259 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3260 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3261 TREE_TYPE (t) = NULL_TREE;
3262 SET_TYPE_STRUCTURAL_EQUALITY (t);
3264 /* Build the corresponding TEMPLATE_DECL. */
3265 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3266 TYPE_NAME (TREE_TYPE (d)) = d;
3267 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3268 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3269 DECL_ARTIFICIAL (d) = 1;
3270 DECL_TEMPLATE_PARMS (d) = parm_list;
3277 /* Push the declarations of builtin types into the namespace.
3278 RID_INDEX is the index of the builtin type in the array
3279 RID_POINTERS. NAME is the name used when looking up the builtin
3280 type. TYPE is the _TYPE node for the builtin type. */
3283 record_builtin_type (enum rid rid_index,
3287 tree rname = NULL_TREE, tname = NULL_TREE;
3288 tree tdecl = NULL_TREE;
3290 if ((int) rid_index < (int) RID_MAX)
3291 rname = ridpointers[(int) rid_index];
3293 tname = get_identifier (name);
3295 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3296 eliminated. Built-in types should not be looked up name; their
3297 names are keywords that the parser can recognize. However, there
3298 is code in c-common.c that uses identifier_global_value to look
3299 up built-in types by name. */
3302 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3303 DECL_ARTIFICIAL (tdecl) = 1;
3304 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3310 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3311 DECL_ARTIFICIAL (tdecl) = 1;
3313 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3316 if (!TYPE_NAME (type))
3317 TYPE_NAME (type) = tdecl;
3320 debug_hooks->type_decl (tdecl, 0);
3323 /* Record one of the standard Java types.
3324 * Declare it as having the given NAME.
3325 * If SIZE > 0, it is the size of one of the integral types;
3326 * otherwise it is the negative of the size of one of the other types. */
3329 record_builtin_java_type (const char* name, int size)
3334 type = build_nonstandard_integer_type (size, 0);
3335 type = build_distinct_type_copy (type);
3337 else if (size > -32)
3340 /* "__java_char" or ""__java_boolean". */
3341 type = build_nonstandard_integer_type (-size, 1);
3342 type = build_distinct_type_copy (type);
3343 /* Get the signed type cached and attached to the unsigned type,
3344 so it doesn't get garbage-collected at "random" times,
3345 causing potential codegen differences out of different UIDs
3346 and different alias set numbers. */
3347 stype = build_nonstandard_integer_type (-size, 0);
3348 stype = build_distinct_type_copy (stype);
3349 TREE_CHAIN (type) = stype;
3350 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3353 { /* "__java_float" or ""__java_double". */
3354 type = make_node (REAL_TYPE);
3355 TYPE_PRECISION (type) = - size;
3358 record_builtin_type (RID_MAX, name, type);
3359 decl = TYPE_NAME (type);
3361 /* Suppress generate debug symbol entries for these types,
3362 since for normal C++ they are just clutter.
3363 However, push_lang_context undoes this if extern "Java" is seen. */
3364 DECL_IGNORED_P (decl) = 1;
3366 TYPE_FOR_JAVA (type) = 1;
3370 /* Push a type into the namespace so that the back ends ignore it. */
3373 record_unknown_type (tree type, const char* name)
3375 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3376 TYPE_DECL, get_identifier (name), type));
3377 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3378 DECL_IGNORED_P (decl) = 1;
3379 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3380 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3381 TYPE_ALIGN (type) = 1;
3382 TYPE_USER_ALIGN (type) = 0;
3383 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3386 /* A string for which we should create an IDENTIFIER_NODE at
3389 typedef struct predefined_identifier
3391 /* The name of the identifier. */
3392 const char *const name;
3393 /* The place where the IDENTIFIER_NODE should be stored. */
3395 /* Nonzero if this is the name of a constructor or destructor. */
3396 const int ctor_or_dtor_p;
3397 } predefined_identifier;
3399 /* Create all the predefined identifiers. */
3402 initialize_predefined_identifiers (void)
3404 const predefined_identifier *pid;
3406 /* A table of identifiers to create at startup. */
3407 static const predefined_identifier predefined_identifiers[] = {
3408 { "C++", &lang_name_cplusplus, 0 },
3409 { "C", &lang_name_c, 0 },
3410 { "Java", &lang_name_java, 0 },
3411 /* Some of these names have a trailing space so that it is
3412 impossible for them to conflict with names written by users. */
3413 { "__ct ", &ctor_identifier, 1 },
3414 { "__base_ctor ", &base_ctor_identifier, 1 },
3415 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3416 { "__dt ", &dtor_identifier, 1 },
3417 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3418 { "__base_dtor ", &base_dtor_identifier, 1 },
3419 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3420 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3421 { "nelts", &nelts_identifier, 0 },
3422 { THIS_NAME, &this_identifier, 0 },
3423 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3424 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3425 { "_vptr", &vptr_identifier, 0 },
3426 { "__vtt_parm", &vtt_parm_identifier, 0 },
3427 { "::", &global_scope_name, 0 },
3428 { "std", &std_identifier, 0 },
3432 for (pid = predefined_identifiers; pid->name; ++pid)
3434 *pid->node = get_identifier (pid->name);
3435 if (pid->ctor_or_dtor_p)
3436 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3440 /* Create the predefined scalar types of C,
3441 and some nodes representing standard constants (0, 1, (void *)0).
3442 Initialize the global binding level.
3443 Make definitions for built-in primitive functions. */
3446 cxx_init_decl_processing (void)
3449 tree void_ftype_ptr;
3451 build_common_tree_nodes (flag_signed_char);
3453 /* Create all the identifiers we need. */
3454 initialize_predefined_identifiers ();
3456 /* Create the global variables. */
3457 push_to_top_level ();
3459 current_function_decl = NULL_TREE;
3460 current_binding_level = NULL;
3461 /* Enter the global namespace. */
3462 gcc_assert (global_namespace == NULL_TREE);
3463 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3465 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3466 TREE_PUBLIC (global_namespace) = 1;
3467 begin_scope (sk_namespace, global_namespace);
3469 current_lang_name = NULL_TREE;
3471 if (flag_visibility_ms_compat)
3472 default_visibility = VISIBILITY_HIDDEN;
3475 current_lang_name = lang_name_c;
3477 /* Create the `std' namespace. */
3478 push_namespace (std_identifier);
3479 std_node = current_namespace;
3482 c_common_nodes_and_builtins ();
3484 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3485 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3486 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3487 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3488 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3489 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3490 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3491 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3493 integer_two_node = build_int_cst (NULL_TREE, 2);
3495 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3496 truthvalue_type_node = boolean_type_node;
3497 truthvalue_false_node = boolean_false_node;
3498 truthvalue_true_node = boolean_true_node;
3500 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3501 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3502 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3505 record_builtin_type (RID_MAX, NULL, string_type_node);
3508 delta_type_node = ptrdiff_type_node;
3509 vtable_index_type = ptrdiff_type_node;
3511 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3512 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3513 void_ftype_ptr = build_function_type_list (void_type_node,
3514 ptr_type_node, NULL_TREE);
3516 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3518 /* C++ extensions */
3520 unknown_type_node = make_node (LANG_TYPE);
3521 record_unknown_type (unknown_type_node, "unknown type");
3523 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3524 TREE_TYPE (unknown_type_node) = unknown_type_node;
3526 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3528 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3529 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3531 init_list_type_node = make_node (LANG_TYPE);
3532 record_unknown_type (init_list_type_node, "init list");
3535 /* Make sure we get a unique function type, so we can give
3536 its pointer type a name. (This wins for gdb.) */
3537 tree vfunc_type = make_node (FUNCTION_TYPE);
3538 TREE_TYPE (vfunc_type) = integer_type_node;
3539 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3540 layout_type (vfunc_type);
3542 vtable_entry_type = build_pointer_type (vfunc_type);
3544 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3547 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3548 layout_type (vtbl_type_node);
3549 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3550 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3551 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3552 layout_type (vtbl_ptr_type_node);
3553 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3555 push_namespace (get_identifier ("__cxxabiv1"));
3556 abi_node = current_namespace;
3559 global_type_node = make_node (LANG_TYPE);
3560 record_unknown_type (global_type_node, "global type");
3563 current_lang_name = lang_name_cplusplus;
3566 tree newtype, deltype;
3567 tree ptr_ftype_sizetype;
3571 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3572 if (cxx_dialect == cxx98)
3575 tree bad_alloc_type_node;
3576 tree bad_alloc_decl;
3578 push_namespace (std_identifier);
3579 bad_alloc_id = get_identifier ("bad_alloc");
3580 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3581 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3583 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3584 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3588 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3591 new_eh_spec = noexcept_false_spec;
3593 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3594 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3595 push_cp_library_fn (NEW_EXPR, newtype);
3596 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3597 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3598 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3600 nullptr_type_node = make_node (NULLPTR_TYPE);
3601 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3602 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3603 TYPE_UNSIGNED (nullptr_type_node) = 1;
3604 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3605 SET_TYPE_MODE (nullptr_type_node, Pmode);
3606 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3607 nullptr_node = build_int_cst (nullptr_type_node, 0);
3611 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3613 /* Perform other language dependent initializations. */
3614 init_class_processing ();
3615 init_rtti_processing ();
3616 init_template_processing ();
3618 if (flag_exceptions)
3619 init_exception_processing ();
3621 if (! supports_one_only ())
3624 make_fname_decl = cp_make_fname_decl;
3625 start_fname_decls ();
3627 /* Show we use EH for cleanups. */
3628 if (flag_exceptions)
3629 using_eh_for_cleanups ();
3632 /* Generate an initializer for a function naming variable from
3633 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3634 filled in with the type of the init. */
3637 cp_fname_init (const char* name, tree *type_p)
3639 tree domain = NULL_TREE;
3641 tree init = NULL_TREE;
3646 length = strlen (name);
3647 domain = build_index_type (size_int (length));
3648 init = build_string (length + 1, name);
3651 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3652 type = build_cplus_array_type (type, domain);
3657 TREE_TYPE (init) = type;
3659 init = error_mark_node;
3664 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3665 the decl, LOC is the location to give the decl, NAME is the
3666 initialization string and TYPE_DEP indicates whether NAME depended
3667 on the type of the function. We make use of that to detect
3668 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3669 at the point of first use, so we mustn't push the decl now. */
3672 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3674 const char *const name = (type_dep && processing_template_decl
3675 ? NULL : fname_as_string (type_dep));
3677 tree init = cp_fname_init (name, &type);
3678 tree decl = build_decl (loc, VAR_DECL, id, type);
3681 free (CONST_CAST (char *, name));
3683 /* As we're using pushdecl_with_scope, we must set the context. */
3684 DECL_CONTEXT (decl) = current_function_decl;
3685 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3687 TREE_STATIC (decl) = 1;
3688 TREE_READONLY (decl) = 1;
3689 DECL_ARTIFICIAL (decl) = 1;
3691 TREE_USED (decl) = 1;
3693 if (current_function_decl)
3695 struct cp_binding_level *b = current_binding_level;
3696 if (b->kind == sk_function_parms)
3697 return error_mark_node;
3698 while (b->level_chain->kind != sk_function_parms)
3700 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3701 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3702 LOOKUP_ONLYCONVERTING);
3705 pushdecl_top_level_and_finish (decl, init);
3711 builtin_function_1 (tree decl, tree context, bool is_global)
3713 tree id = DECL_NAME (decl);
3714 const char *name = IDENTIFIER_POINTER (id);
3716 retrofit_lang_decl (decl);
3718 DECL_ARTIFICIAL (decl) = 1;
3719 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3720 SET_DECL_LANGUAGE (decl, lang_c);
3721 /* Runtime library routines are, by definition, available in an
3722 external shared object. */
3723 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3724 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3726 DECL_CONTEXT (decl) = context;
3729 pushdecl_top_level (decl);
3733 /* A function in the user's namespace should have an explicit
3734 declaration before it is used. Mark the built-in function as
3735 anticipated but not actually declared. */
3736 if (name[0] != '_' || name[1] != '_')
3737 DECL_ANTICIPATED (decl) = 1;
3738 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3740 size_t len = strlen (name);
3742 /* Treat __*_chk fortification functions as anticipated as well,
3743 unless they are __builtin_*. */
3744 if (len > strlen ("___chk")
3745 && memcmp (name + len - strlen ("_chk"),
3746 "_chk", strlen ("_chk") + 1) == 0)
3747 DECL_ANTICIPATED (decl) = 1;
3754 cxx_builtin_function (tree decl)
3756 tree id = DECL_NAME (decl);
3757 const char *name = IDENTIFIER_POINTER (id);
3758 /* All builtins that don't begin with an '_' should additionally
3759 go in the 'std' namespace. */
3762 tree decl2 = copy_node(decl);
3763 push_namespace (std_identifier);
3764 builtin_function_1 (decl2, std_node, false);
3768 return builtin_function_1 (decl, NULL_TREE, false);
3771 /* Like cxx_builtin_function, but guarantee the function is added to the global
3772 scope. This is to allow function specific options to add new machine
3773 dependent builtins when the target ISA changes via attribute((target(...)))
3774 which saves space on program startup if the program does not use non-generic
3778 cxx_builtin_function_ext_scope (tree decl)
3781 tree id = DECL_NAME (decl);
3782 const char *name = IDENTIFIER_POINTER (id);
3783 /* All builtins that don't begin with an '_' should additionally
3784 go in the 'std' namespace. */
3787 tree decl2 = copy_node(decl);
3788 push_namespace (std_identifier);
3789 builtin_function_1 (decl2, std_node, true);
3793 return builtin_function_1 (decl, NULL_TREE, true);
3796 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3797 function. Not called directly. */
3800 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3802 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3803 DECL_EXTERNAL (fn) = 1;
3804 TREE_PUBLIC (fn) = 1;
3805 DECL_ARTIFICIAL (fn) = 1;
3806 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3807 SET_DECL_LANGUAGE (fn, lang_c);
3808 /* Runtime library routines are, by definition, available in an
3809 external shared object. */
3810 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3811 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3815 /* Returns the _DECL for a library function with C linkage.
3816 We assume that such functions never throw; if this is incorrect,
3817 callers should unset TREE_NOTHROW. */
3820 build_library_fn (tree name, tree type)
3822 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3823 TREE_NOTHROW (fn) = 1;
3827 /* Returns the _DECL for a library function with C++ linkage. */
3830 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3832 tree fn = build_library_fn_1 (name, operator_code, type);
3833 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3834 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3835 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3839 /* Like build_library_fn, but takes a C string instead of an
3843 build_library_fn_ptr (const char* name, tree type)
3845 return build_library_fn (get_identifier (name), type);
3848 /* Like build_cp_library_fn, but takes a C string instead of an
3852 build_cp_library_fn_ptr (const char* name, tree type)
3854 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3857 /* Like build_library_fn, but also pushes the function so that we will
3858 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3859 may throw exceptions listed in RAISES. */
3862 push_library_fn (tree name, tree type, tree raises)
3867 type = build_exception_variant (type, raises);
3869 fn = build_library_fn (name, type);
3870 pushdecl_top_level (fn);
3874 /* Like build_cp_library_fn, but also pushes the function so that it
3875 will be found by normal lookup. */
3878 push_cp_library_fn (enum tree_code operator_code, tree type)
3880 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3887 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3891 push_void_library_fn (tree name, tree parmtypes)
3893 tree type = build_function_type (void_type_node, parmtypes);
3894 return push_library_fn (name, type, NULL_TREE);
3897 /* Like push_library_fn, but also note that this function throws
3898 and does not return. Used for __throw_foo and the like. */
3901 push_throw_library_fn (tree name, tree type)
3903 tree fn = push_library_fn (name, type, NULL_TREE);
3904 TREE_THIS_VOLATILE (fn) = 1;
3905 TREE_NOTHROW (fn) = 0;
3909 /* When we call finish_struct for an anonymous union, we create
3910 default copy constructors and such. But, an anonymous union
3911 shouldn't have such things; this function undoes the damage to the
3912 anonymous union type T.
3914 (The reason that we create the synthesized methods is that we don't
3915 distinguish `union { int i; }' from `typedef union { int i; } U'.
3916 The first is an anonymous union; the second is just an ordinary
3920 fixup_anonymous_aggr (tree t)
3924 /* Wipe out memory of synthesized methods. */
3925 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3926 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3927 TYPE_HAS_COPY_CTOR (t) = 0;
3928 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3929 TYPE_HAS_COPY_ASSIGN (t) = 0;
3930 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3932 /* Splice the implicitly generated functions out of the TYPE_METHODS
3934 q = &TYPE_METHODS (t);
3937 if (DECL_ARTIFICIAL (*q))
3938 *q = TREE_CHAIN (*q);
3940 q = &DECL_CHAIN (*q);
3943 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3944 if (TYPE_METHODS (t))
3946 tree decl = TYPE_MAIN_DECL (t);
3948 if (TREE_CODE (t) != UNION_TYPE)
3949 error_at (DECL_SOURCE_LOCATION (decl),
3950 "an anonymous struct cannot have function members");
3952 error_at (DECL_SOURCE_LOCATION (decl),
3953 "an anonymous union cannot have function members");
3956 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3957 assignment operators (because they cannot have these methods themselves).
3958 For anonymous unions this is already checked because they are not allowed
3959 in any union, otherwise we have to check it. */
3960 if (TREE_CODE (t) != UNION_TYPE)
3964 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3965 if (TREE_CODE (field) == FIELD_DECL)
3967 type = TREE_TYPE (field);
3968 if (CLASS_TYPE_P (type))
3970 if (TYPE_NEEDS_CONSTRUCTING (type))
3971 error ("member %q+#D with constructor not allowed "
3972 "in anonymous aggregate", field);
3973 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3974 error ("member %q+#D with destructor not allowed "
3975 "in anonymous aggregate", field);
3976 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3977 error ("member %q+#D with copy assignment operator "
3978 "not allowed in anonymous aggregate", field);
3984 /* Make sure that a declaration with no declarator is well-formed, i.e.
3985 just declares a tagged type or anonymous union.
3987 Returns the type declared; or NULL_TREE if none. */
3990 check_tag_decl (cp_decl_specifier_seq *declspecs)
3992 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3993 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3994 /* If a class, struct, or enum type is declared by the DECLSPECS
3995 (i.e, if a class-specifier, enum-specifier, or non-typename
3996 elaborated-type-specifier appears in the DECLSPECS),
3997 DECLARED_TYPE is set to the corresponding type. */
3998 tree declared_type = NULL_TREE;
3999 bool error_p = false;
4001 if (declspecs->multiple_types_p)
4002 error ("multiple types in one declaration");
4003 else if (declspecs->redefined_builtin_type)
4005 if (!in_system_header)
4006 permerror (input_location, "redeclaration of C++ built-in type %qT",
4007 declspecs->redefined_builtin_type);
4012 && TYPE_P (declspecs->type)
4013 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4014 && MAYBE_CLASS_TYPE_P (declspecs->type))
4015 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4016 declared_type = declspecs->type;
4017 else if (declspecs->type == error_mark_node)
4019 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4020 permerror (input_location, "declaration does not declare anything");
4021 /* Check for an anonymous union. */
4022 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4023 && TYPE_ANONYMOUS_P (declared_type))
4025 /* 7/3 In a simple-declaration, the optional init-declarator-list
4026 can be omitted only when declaring a class (clause 9) or
4027 enumeration (7.2), that is, when the decl-specifier-seq contains
4028 either a class-specifier, an elaborated-type-specifier with
4029 a class-key (9.1), or an enum-specifier. In these cases and
4030 whenever a class-specifier or enum-specifier is present in the
4031 decl-specifier-seq, the identifiers in these specifiers are among
4032 the names being declared by the declaration (as class-name,
4033 enum-names, or enumerators, depending on the syntax). In such
4034 cases, and except for the declaration of an unnamed bit-field (9.6),
4035 the decl-specifier-seq shall introduce one or more names into the
4036 program, or shall redeclare a name introduced by a previous
4037 declaration. [Example:
4038 enum { }; // ill-formed
4039 typedef class { }; // ill-formed
4043 error ("missing type-name in typedef-declaration");
4046 /* Anonymous unions are objects, so they can have specifiers. */;
4047 SET_ANON_AGGR_TYPE_P (declared_type);
4049 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4050 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4055 if (declspecs->specs[(int)ds_inline]
4056 || declspecs->specs[(int)ds_virtual])
4057 error ("%qs can only be specified for functions",
4058 declspecs->specs[(int)ds_inline]
4059 ? "inline" : "virtual");
4061 && (!current_class_type
4062 || current_scope () != current_class_type))
4063 error ("%<friend%> can only be specified inside a class");
4064 else if (declspecs->specs[(int)ds_explicit])
4065 error ("%<explicit%> can only be specified for constructors");
4066 else if (declspecs->storage_class)
4067 error ("a storage class can only be specified for objects "
4069 else if (declspecs->specs[(int)ds_const]
4070 || declspecs->specs[(int)ds_volatile]
4071 || declspecs->specs[(int)ds_restrict]
4072 || declspecs->specs[(int)ds_thread])
4073 error ("qualifiers can only be specified for objects "
4075 else if (saw_typedef)
4076 warning (0, "%<typedef%> was ignored in this declaration");
4077 else if (declspecs->specs[(int) ds_constexpr])
4078 error ("%<constexpr%> cannot be used for type declarations");
4081 return declared_type;
4084 /* Called when a declaration is seen that contains no names to declare.
4085 If its type is a reference to a structure, union or enum inherited
4086 from a containing scope, shadow that tag name for the current scope
4087 with a forward reference.
4088 If its type defines a new named structure or union
4089 or defines an enum, it is valid but we need not do anything here.
4090 Otherwise, it is an error.
4092 C++: may have to grok the declspecs to learn about static,
4093 complain for anonymous unions.
4095 Returns the TYPE declared -- or NULL_TREE if none. */
4098 shadow_tag (cp_decl_specifier_seq *declspecs)
4100 tree t = check_tag_decl (declspecs);
4105 if (declspecs->attributes)
4107 warning (0, "attribute ignored in declaration of %q+#T", t);
4108 warning (0, "attribute for %q+#T must follow the %qs keyword",
4109 t, class_key_or_enum_as_string (t));
4113 if (maybe_process_partial_specialization (t) == error_mark_node)
4116 /* This is where the variables in an anonymous union are
4117 declared. An anonymous union declaration looks like:
4119 because there is no declarator after the union, the parser
4120 sends that declaration here. */
4121 if (ANON_AGGR_TYPE_P (t))
4123 fixup_anonymous_aggr (t);
4125 if (TYPE_FIELDS (t))
4127 tree decl = grokdeclarator (/*declarator=*/NULL,
4128 declspecs, NORMAL, 0, NULL);
4129 finish_anon_union (decl);
4136 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4139 groktypename (cp_decl_specifier_seq *type_specifiers,
4140 const cp_declarator *declarator,
4141 bool is_template_arg)
4145 enum decl_context context
4146 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4147 attrs = type_specifiers->attributes;
4148 type_specifiers->attributes = NULL_TREE;
4149 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4150 if (attrs && type != error_mark_node)
4152 if (CLASS_TYPE_P (type))
4153 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4154 "outside of definition", type);
4155 else if (MAYBE_CLASS_TYPE_P (type))
4156 /* A template type parameter or other dependent type. */
4157 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4158 "type %qT without an associated declaration", type);
4160 cplus_decl_attributes (&type, attrs, 0);
4165 /* Process a DECLARATOR for a function-scope variable declaration,
4166 namespace-scope variable declaration, or function declaration.
4167 (Function definitions go through start_function; class member
4168 declarations appearing in the body of the class go through
4169 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4170 If an error occurs, the error_mark_node is returned instead.
4172 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4173 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4174 for an explicitly defaulted function, or SD_DELETED for an explicitly
4175 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4176 implicitly initialized via a default constructor. ATTRIBUTES and
4177 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4178 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4179 set, the caller is responsible for calling pop_scope. */
4182 start_decl (const cp_declarator *declarator,
4183 cp_decl_specifier_seq *declspecs,
4186 tree prefix_attributes,
4187 tree *pushed_scope_p)
4195 *pushed_scope_p = NULL_TREE;
4197 /* An object declared as __attribute__((deprecated)) suppresses
4198 warnings of uses of other deprecated items. */
4199 if (lookup_attribute ("deprecated", attributes))
4200 deprecated_state = DEPRECATED_SUPPRESS;
4202 attributes = chainon (attributes, prefix_attributes);
4204 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4207 deprecated_state = DEPRECATED_NORMAL;
4209 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4210 || decl == error_mark_node)
4211 return error_mark_node;
4213 context = CP_DECL_CONTEXT (decl);
4214 if (context != global_namespace)
4215 *pushed_scope_p = push_scope (context);
4218 /* Is it valid for this decl to have an initializer at all?
4219 If not, set INITIALIZED to zero, which will indirectly
4220 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4221 switch (TREE_CODE (decl))
4224 error ("typedef %qD is initialized (use decltype instead)", decl);
4225 return error_mark_node;
4228 if (initialized == SD_DELETED)
4229 /* We'll handle the rest of the semantics later, but we need to
4230 set this now so it's visible to duplicate_decls. */
4231 DECL_DELETED_FN (decl) = 1;
4240 if (! toplevel_bindings_p ()
4241 && DECL_EXTERNAL (decl))
4242 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4244 DECL_EXTERNAL (decl) = 0;
4245 if (toplevel_bindings_p ())
4246 TREE_STATIC (decl) = 1;
4248 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4250 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4251 record_key_method_defined (decl);
4253 /* If this is a typedef that names the class for linkage purposes
4254 (7.1.3p8), apply any attributes directly to the type. */
4255 if (TREE_CODE (decl) == TYPE_DECL
4256 && TAGGED_TYPE_P (TREE_TYPE (decl))
4257 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4258 flags = ATTR_FLAG_TYPE_IN_PLACE;
4262 /* Set attributes here so if duplicate decl, will have proper attributes. */
4263 cplus_decl_attributes (&decl, attributes, flags);
4265 /* Dllimported symbols cannot be defined. Static data members (which
4266 can be initialized in-class and dllimported) go through grokfield,
4267 not here, so we don't need to exclude those decls when checking for
4269 if (initialized && DECL_DLLIMPORT_P (decl))
4271 error ("definition of %q#D is marked %<dllimport%>", decl);
4272 DECL_DLLIMPORT_P (decl) = 0;
4275 /* If #pragma weak was used, mark the decl weak now. */
4276 maybe_apply_pragma_weak (decl);
4278 if (TREE_CODE (decl) == FUNCTION_DECL
4279 && DECL_DECLARED_INLINE_P (decl)
4280 && DECL_UNINLINABLE (decl)
4281 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4282 warning (0, "inline function %q+D given attribute noinline", decl);
4284 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4286 if (TREE_CODE (decl) == VAR_DECL)
4288 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4289 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4290 error ("%q#D is not a static member of %q#T", decl, context);
4293 if (DECL_CONTEXT (field) != context)
4295 if (!same_type_p (DECL_CONTEXT (field), context))
4296 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4297 "to be defined as %<%T::%D%>",
4298 DECL_CONTEXT (field), DECL_NAME (decl),
4299 context, DECL_NAME (decl));
4300 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4302 if (processing_specialization
4303 && template_class_depth (context) == 0
4304 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4305 error ("template header not allowed in member definition "
4306 "of explicitly specialized class");
4307 /* Static data member are tricky; an in-class initialization
4308 still doesn't provide a definition, so the in-class
4309 declaration will have DECL_EXTERNAL set, but will have an
4310 initialization. Thus, duplicate_decls won't warn
4311 about this situation, and so we check here. */
4312 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4313 error ("duplicate initialization of %qD", decl);
4314 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4316 if (declspecs->specs[(int) ds_constexpr]
4317 && !DECL_DECLARED_CONSTEXPR_P (field))
4318 error ("%qD declared %<constexpr%> outside its class", field);
4323 tree field = check_classfn (context, decl,
4324 (processing_template_decl
4325 > template_class_depth (context))
4326 ? current_template_parms
4328 if (field && field != error_mark_node
4329 && duplicate_decls (decl, field,
4330 /*newdecl_is_friend=*/false))
4334 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4335 DECL_IN_AGGR_P (decl) = 0;
4336 /* Do not mark DECL as an explicit specialization if it was not
4337 already marked as an instantiation; a declaration should
4338 never be marked as a specialization unless we know what
4339 template is being specialized. */
4340 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4342 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4344 /* [temp.expl.spec] An explicit specialization of a static data
4345 member of a template is a definition if the declaration
4346 includes an initializer; otherwise, it is a declaration.
4348 We check for processing_specialization so this only applies
4349 to the new specialization syntax. */
4350 if (!initialized && processing_specialization)
4351 DECL_EXTERNAL (decl) = 1;
4354 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4355 /* Aliases are definitions. */
4357 permerror (input_location, "declaration of %q#D outside of class is not definition",
4361 was_public = TREE_PUBLIC (decl);
4363 /* Enter this declaration into the symbol table. */
4364 decl = maybe_push_decl (decl);
4366 if (processing_template_decl)
4367 decl = push_template_decl (decl);
4368 if (decl == error_mark_node)
4369 return error_mark_node;
4371 /* Tell the back end to use or not use .common as appropriate. If we say
4372 -fconserve-space, we want this to save .data space, at the expense of
4373 wrong semantics. If we say -fno-conserve-space, we want this to
4374 produce errors about redefs; to do this we force variables into the
4376 if (flag_conserve_space
4377 && TREE_CODE (decl) == VAR_DECL
4378 && TREE_PUBLIC (decl)
4379 && !DECL_THREAD_LOCAL_P (decl)
4380 && !have_global_bss_p ())
4381 DECL_COMMON (decl) = 1;
4383 if (TREE_CODE (decl) == VAR_DECL
4384 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4385 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4387 /* This is a const variable with implicit 'static'. Set
4388 DECL_THIS_STATIC so we can tell it from variables that are
4389 !TREE_PUBLIC because of the anonymous namespace. */
4390 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4391 DECL_THIS_STATIC (decl) = 1;
4394 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4395 start_decl_1 (decl, initialized);
4400 /* Process the declaration of a variable DECL. INITIALIZED is true
4401 iff DECL is explicitly initialized. (INITIALIZED is false if the
4402 variable is initialized via an implicitly-called constructor.)
4403 This function must be called for ordinary variables (including, for
4404 example, implicit instantiations of templates), but must not be
4405 called for template declarations. */
4408 start_decl_1 (tree decl, bool initialized)
4412 bool aggregate_definition_p;
4414 gcc_assert (!processing_template_decl);
4416 if (error_operand_p (decl))
4419 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4421 type = TREE_TYPE (decl);
4422 complete_p = COMPLETE_TYPE_P (type);
4423 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4425 /* If an explicit initializer is present, or if this is a definition
4426 of an aggregate, then we need a complete type at this point.
4427 (Scalars are always complete types, so there is nothing to
4428 check.) This code just sets COMPLETE_P; errors (if necessary)
4429 are issued below. */
4430 if ((initialized || aggregate_definition_p)
4432 && COMPLETE_TYPE_P (complete_type (type)))
4435 /* We will not yet have set TREE_READONLY on DECL if the type
4436 was "const", but incomplete, before this point. But, now, we
4437 have a complete type, so we can try again. */
4438 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4442 /* Is it valid for this decl to have an initializer at all? */
4444 /* Don't allow initializations for incomplete types except for
4445 arrays which might be completed by the initialization. */
4447 ; /* A complete type is ok. */
4448 else if (type_uses_auto (type))
4449 ; /* An auto type is ok. */
4450 else if (TREE_CODE (type) != ARRAY_TYPE)
4452 error ("variable %q#D has initializer but incomplete type", decl);
4453 type = TREE_TYPE (decl) = error_mark_node;
4455 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4457 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4458 error ("elements of array %q#D have incomplete type", decl);
4459 /* else we already gave an error in start_decl. */
4462 else if (aggregate_definition_p && !complete_p)
4464 if (type_uses_auto (type))
4465 error ("declaration of %q#D has no initializer", decl);
4467 error ("aggregate %q#D has incomplete type and cannot be defined",
4469 /* Change the type so that assemble_variable will give
4470 DECL an rtl we can live with: (mem (const_int 0)). */
4471 type = TREE_TYPE (decl) = error_mark_node;
4474 /* Create a new scope to hold this declaration if necessary.
4475 Whether or not a new scope is necessary cannot be determined
4476 until after the type has been completed; if the type is a
4477 specialization of a class template it is not until after
4478 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4479 will be set correctly. */
4480 maybe_push_cleanup_level (type);
4483 /* Handle initialization of references. DECL, TYPE, and INIT have the
4484 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4485 but will be set to a new CLEANUP_STMT if a temporary is created
4486 that must be destroyed subsequently.
4488 Returns an initializer expression to use to initialize DECL, or
4489 NULL if the initialization can be performed statically.
4491 Quotes on semantics can be found in ARM 8.4.3. */
4494 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4498 if (init == NULL_TREE)
4500 if ((DECL_LANG_SPECIFIC (decl) == 0
4501 || DECL_IN_AGGR_P (decl) == 0)
4502 && ! DECL_THIS_EXTERN (decl))
4503 error ("%qD declared as reference but not initialized", decl);
4507 if (TREE_CODE (init) == TREE_LIST)
4508 init = build_x_compound_expr_from_list (init, ELK_INIT,
4509 tf_warning_or_error);
4511 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4512 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4513 /* Note: default conversion is only called in very special cases. */
4514 init = decay_conversion (init);
4516 /* Convert INIT to the reference type TYPE. This may involve the
4517 creation of a temporary, whose lifetime must be the same as that
4518 of the reference. If so, a DECL_EXPR for the temporary will be
4519 added just after the DECL_EXPR for DECL. That's why we don't set
4520 DECL_INITIAL for local references (instead assigning to them
4521 explicitly); we need to allow the temporary to be initialized
4523 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4525 if (tmp == error_mark_node)
4527 else if (tmp == NULL_TREE)
4529 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4533 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4536 DECL_INITIAL (decl) = tmp;
4541 /* Subroutine of check_initializer. We're initializing a DECL of
4542 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4543 extend the lifetime of the underlying array to match that of the decl,
4544 just like for reference initialization. CLEANUP is as for
4545 grok_reference_init. */
4548 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4551 tree aggr_init, array, arrtype;
4552 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4553 if (error_operand_p (init))
4554 return error_mark_node;
4556 aggr_init = TARGET_EXPR_INITIAL (init);
4557 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4558 arrtype = TREE_TYPE (array);
4560 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4561 array = TREE_OPERAND (array, 0);
4562 /* If the array is constant, finish_compound_literal already made it a
4563 static variable and we don't need to do anything here. */
4564 if (decl && TREE_CODE (array) == TARGET_EXPR)
4566 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4567 var = build_address (var);
4568 var = convert (arrtype, var);
4569 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4574 /* Designated initializers in arrays are not supported in GNU C++.
4575 The parser cannot detect this error since it does not know whether
4576 a given brace-enclosed initializer is for a class type or for an
4577 array. This function checks that CE does not use a designated
4578 initializer. If it does, an error is issued. Returns true if CE
4579 is valid, i.e., does not have a designated initializer. */
4582 check_array_designated_initializer (const constructor_elt *ce)
4584 /* Designated initializers for array elements are not supported. */
4587 /* The parser only allows identifiers as designated
4589 if (ce->index == error_mark_node)
4590 error ("name used in a GNU-style designated "
4591 "initializer for an array");
4594 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4595 error ("name %qD used in a GNU-style designated "
4596 "initializer for an array", ce->index);
4604 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4605 array until we finish parsing the initializer. If that's the
4606 situation we're in, update DECL accordingly. */
4609 maybe_deduce_size_from_array_init (tree decl, tree init)
4611 tree type = TREE_TYPE (decl);
4613 if (TREE_CODE (type) == ARRAY_TYPE
4614 && TYPE_DOMAIN (type) == NULL_TREE
4615 && TREE_CODE (decl) != TYPE_DECL)
4617 /* do_default is really a C-ism to deal with tentative definitions.
4618 But let's leave it here to ease the eventual merge. */
4619 int do_default = !DECL_EXTERNAL (decl);
4620 tree initializer = init ? init : DECL_INITIAL (decl);
4623 /* Check that there are no designated initializers in INIT, as
4624 those are not supported in GNU C++, and as the middle-end
4625 will crash if presented with a non-numeric designated
4627 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4629 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4630 constructor_elt *ce;
4632 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4633 if (!check_array_designated_initializer (ce))
4639 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4643 error ("initializer fails to determine size of %qD", decl);
4644 TREE_TYPE (decl) = error_mark_node;
4646 else if (failure == 2)
4650 error ("array size missing in %qD", decl);
4651 TREE_TYPE (decl) = error_mark_node;
4653 /* If a `static' var's size isn't known, make it extern as
4654 well as static, so it does not get allocated. If it's not
4655 `static', then don't mark it extern; finish_incomplete_decl
4656 will give it a default size and it will get allocated. */
4657 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4658 DECL_EXTERNAL (decl) = 1;
4660 else if (failure == 3)
4662 error ("zero-size array %qD", decl);
4663 TREE_TYPE (decl) = error_mark_node;
4667 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4669 relayout_decl (decl);
4673 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4674 any appropriate error messages regarding the layout. */
4677 layout_var_decl (tree decl)
4681 type = TREE_TYPE (decl);
4682 if (type == error_mark_node)
4685 /* If we haven't already layed out this declaration, do so now.
4686 Note that we must not call complete type for an external object
4687 because it's type might involve templates that we are not
4688 supposed to instantiate yet. (And it's perfectly valid to say
4689 `extern X x' for some incomplete type `X'.) */
4690 if (!DECL_EXTERNAL (decl))
4691 complete_type (type);
4692 if (!DECL_SIZE (decl)
4693 && TREE_TYPE (decl) != error_mark_node
4694 && (COMPLETE_TYPE_P (type)
4695 || (TREE_CODE (type) == ARRAY_TYPE
4696 && !TYPE_DOMAIN (type)
4697 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4698 layout_decl (decl, 0);
4700 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4702 /* An automatic variable with an incomplete type: that is an error.
4703 Don't talk about array types here, since we took care of that
4704 message in grokdeclarator. */
4705 error ("storage size of %qD isn%'t known", decl);
4706 TREE_TYPE (decl) = error_mark_node;
4709 /* Keep this code around in case we later want to control debug info
4710 based on whether a type is "used". (jason 1999-11-11) */
4712 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4713 /* Let debugger know it should output info for this type. */
4714 note_debug_info_needed (ttype);
4716 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4717 note_debug_info_needed (DECL_CONTEXT (decl));
4720 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4721 && DECL_SIZE (decl) != NULL_TREE
4722 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4724 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4725 constant_expression_warning (DECL_SIZE (decl));
4728 error ("storage size of %qD isn%'t constant", decl);
4729 TREE_TYPE (decl) = error_mark_node;
4734 /* If a local static variable is declared in an inline function, or if
4735 we have a weak definition, we must endeavor to create only one
4736 instance of the variable at link-time. */
4739 maybe_commonize_var (tree decl)
4741 /* Static data in a function with comdat linkage also has comdat
4743 if (TREE_STATIC (decl)
4744 /* Don't mess with __FUNCTION__. */
4745 && ! DECL_ARTIFICIAL (decl)
4746 && DECL_FUNCTION_SCOPE_P (decl)
4747 && vague_linkage_p (DECL_CONTEXT (decl)))
4751 /* With weak symbols, we simply make the variable COMDAT;
4752 that will cause copies in multiple translations units to
4754 comdat_linkage (decl);
4758 if (DECL_INITIAL (decl) == NULL_TREE
4759 || DECL_INITIAL (decl) == error_mark_node)
4761 /* Without weak symbols, we can use COMMON to merge
4762 uninitialized variables. */
4763 TREE_PUBLIC (decl) = 1;
4764 DECL_COMMON (decl) = 1;
4768 /* While for initialized variables, we must use internal
4769 linkage -- which means that multiple copies will not
4771 TREE_PUBLIC (decl) = 0;
4772 DECL_COMMON (decl) = 0;
4773 warning_at (input_location, 0,
4774 "sorry: semantics of inline function static "
4775 "data %q+#D are wrong (you%'ll wind up "
4776 "with multiple copies)", decl);
4777 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4778 " you can work around this by removing "
4783 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4784 /* Set it up again; we might have set DECL_INITIAL since the last
4786 comdat_linkage (decl);
4789 /* Issue an error message if DECL is an uninitialized const variable. */
4792 check_for_uninitialized_const_var (tree decl)
4794 tree type = strip_array_types (TREE_TYPE (decl));
4796 /* ``Unless explicitly declared extern, a const object does not have
4797 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4799 if (TREE_CODE (decl) == VAR_DECL
4800 && TREE_CODE (type) != REFERENCE_TYPE
4801 && CP_TYPE_CONST_P (type)
4802 && (!TYPE_NEEDS_CONSTRUCTING (type)
4803 || !type_has_user_provided_default_constructor (type))
4804 && !DECL_INITIAL (decl))
4806 permerror (DECL_SOURCE_LOCATION (decl),
4807 "uninitialized const %qD", decl);
4809 if (CLASS_TYPE_P (type)
4810 && !type_has_user_provided_default_constructor (type))
4812 tree defaulted_ctor;
4814 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4815 "%q#T has no user-provided default constructor", type);
4816 defaulted_ctor = in_class_defaulted_default_constructor (type);
4818 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4819 "constructor is not user-provided because it is "
4820 "explicitly defaulted in the class body");
4825 /* Structure holding the current initializer being processed by reshape_init.
4826 CUR is a pointer to the current element being processed, END is a pointer
4827 after the last element present in the initializer. */
4828 typedef struct reshape_iterator_t
4830 constructor_elt *cur;
4831 constructor_elt *end;
4834 static tree reshape_init_r (tree, reshape_iter *, bool);
4836 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4837 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4838 initialized. If there are no more such fields, the return value
4842 next_initializable_field (tree field)
4845 && (TREE_CODE (field) != FIELD_DECL
4846 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4847 || DECL_ARTIFICIAL (field)))
4848 field = DECL_CHAIN (field);
4853 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4854 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4855 INTEGER_CST representing the size of the array minus one (the maximum index),
4856 or NULL_TREE if the array was declared without specifying the size. D is
4857 the iterator within the constructor. */
4860 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4863 bool sized_array_p = (max_index != NULL_TREE);
4864 unsigned HOST_WIDE_INT max_index_cst = 0;
4865 unsigned HOST_WIDE_INT index;
4867 /* The initializer for an array is always a CONSTRUCTOR. */
4868 new_init = build_constructor (init_list_type_node, NULL);
4872 /* Minus 1 is used for zero sized arrays. */
4873 if (integer_all_onesp (max_index))
4876 if (host_integerp (max_index, 1))
4877 max_index_cst = tree_low_cst (max_index, 1);
4878 /* sizetype is sign extended, not zero extended. */
4880 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4884 /* Loop until there are no more initializers. */
4886 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4891 check_array_designated_initializer (d->cur);
4892 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4893 if (elt_init == error_mark_node)
4894 return error_mark_node;
4895 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4901 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4902 Parameters are the same of reshape_init_r. */
4905 reshape_init_array (tree type, reshape_iter *d)
4907 tree max_index = NULL_TREE;
4909 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4911 if (TYPE_DOMAIN (type))
4912 max_index = array_type_nelts (type);
4914 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4917 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4918 Parameters are the same of reshape_init_r. */
4921 reshape_init_vector (tree type, reshape_iter *d)
4923 tree max_index = NULL_TREE;
4925 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4927 if (COMPOUND_LITERAL_P (d->cur->value))
4929 tree value = d->cur->value;
4930 if (!same_type_p (TREE_TYPE (value), type))
4932 error ("invalid type %qT as initializer for a vector of type %qT",
4933 TREE_TYPE (d->cur->value), type);
4934 value = error_mark_node;
4940 /* For a vector, we initialize it as an array of the appropriate size. */
4941 if (TREE_CODE (type) == VECTOR_TYPE)
4942 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4944 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4947 /* Subroutine of reshape_init_r, processes the initializers for classes
4948 or union. Parameters are the same of reshape_init_r. */
4951 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4956 gcc_assert (CLASS_TYPE_P (type));
4958 /* The initializer for a class is always a CONSTRUCTOR. */
4959 new_init = build_constructor (init_list_type_node, NULL);
4960 field = next_initializable_field (TYPE_FIELDS (type));
4966 An initializer for an aggregate member that is an
4967 empty class shall have the form of an empty
4968 initializer-list {}. */
4969 if (!first_initializer_p)
4971 error ("initializer for %qT must be brace-enclosed", type);
4972 return error_mark_node;
4977 /* Loop through the initializable fields, gathering initializers. */
4978 while (d->cur != d->end)
4982 /* Handle designated initializers, as an extension. */
4985 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4987 if (!field || TREE_CODE (field) != FIELD_DECL)
4989 error ("%qT has no non-static data member named %qD", type,
4991 return error_mark_node;
4995 /* If we processed all the member of the class, we are done. */
4999 field_init = reshape_init_r (TREE_TYPE (field), d,
5000 /*first_initializer_p=*/false);
5001 if (field_init == error_mark_node)
5002 return error_mark_node;
5004 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5008 When a union is initialized with a brace-enclosed
5009 initializer, the braces shall only contain an
5010 initializer for the first member of the union. */
5011 if (TREE_CODE (type) == UNION_TYPE)
5014 field = next_initializable_field (DECL_CHAIN (field));
5020 /* Subroutine of reshape_init, which processes a single initializer (part of
5021 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5022 iterator within the CONSTRUCTOR which points to the initializer to process.
5023 FIRST_INITIALIZER_P is true if this is the first initializer of the
5024 outermost CONSTRUCTOR node. */
5027 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5029 tree init = d->cur->value;
5031 if (error_operand_p (init))
5032 return error_mark_node;
5034 /* A non-aggregate type is always initialized with a single
5036 if (!CP_AGGREGATE_TYPE_P (type))
5038 /* It is invalid to initialize a non-aggregate type with a
5039 brace-enclosed initializer before C++0x.
5040 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5041 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5042 a CONSTRUCTOR (with a record type). */
5043 if (TREE_CODE (init) == CONSTRUCTOR
5044 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5046 if (SCALAR_TYPE_P (type))
5048 error ("braces around scalar initializer for type %qT", type);
5049 init = error_mark_node;
5052 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5061 All implicit type conversions (clause _conv_) are considered when
5062 initializing the aggregate member with an initializer from an
5063 initializer-list. If the initializer can initialize a member,
5064 the member is initialized. Otherwise, if the member is itself a
5065 non-empty subaggregate, brace elision is assumed and the
5066 initializer is considered for the initialization of the first
5067 member of the subaggregate. */
5068 if (TREE_CODE (init) != CONSTRUCTOR
5069 /* But don't try this for the first initializer, since that would be
5070 looking through the outermost braces; A a2 = { a1 }; is not a
5071 valid aggregate initialization. */
5072 && !first_initializer_p
5073 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5074 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5080 /* [dcl.init.string]
5082 A char array (whether plain char, signed char, or unsigned char)
5083 can be initialized by a string-literal (optionally enclosed in
5084 braces); a wchar_t array can be initialized by a wide
5085 string-literal (optionally enclosed in braces). */
5086 if (TREE_CODE (type) == ARRAY_TYPE
5087 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5089 tree str_init = init;
5091 /* Strip one level of braces if and only if they enclose a single
5092 element (as allowed by [dcl.init.string]). */
5093 if (!first_initializer_p
5094 && TREE_CODE (str_init) == CONSTRUCTOR
5095 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5097 str_init = VEC_index (constructor_elt,
5098 CONSTRUCTOR_ELTS (str_init), 0)->value;
5101 /* If it's a string literal, then it's the initializer for the array
5102 as a whole. Otherwise, continue with normal initialization for
5103 array types (one value per array element). */
5104 if (TREE_CODE (str_init) == STRING_CST)
5111 /* The following cases are about aggregates. If we are not within a full
5112 initializer already, and there is not a CONSTRUCTOR, it means that there
5113 is a missing set of braces (that is, we are processing the case for
5114 which reshape_init exists). */
5115 if (!first_initializer_p)
5117 if (TREE_CODE (init) == CONSTRUCTOR)
5119 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5120 /* There is no need to reshape pointer-to-member function
5121 initializers, as they are always constructed correctly
5122 by the front end. */
5124 else if (COMPOUND_LITERAL_P (init))
5125 /* For a nested compound literal, there is no need to reshape since
5126 brace elision is not allowed. Even if we decided to allow it,
5127 we should add a call to reshape_init in finish_compound_literal,
5128 before calling digest_init, so changing this code would still
5129 not be necessary. */
5130 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5134 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5135 return reshape_init (type, init);
5139 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5143 /* Dispatch to specialized routines. */
5144 if (CLASS_TYPE_P (type))
5145 return reshape_init_class (type, d, first_initializer_p);
5146 else if (TREE_CODE (type) == ARRAY_TYPE)
5147 return reshape_init_array (type, d);
5148 else if (TREE_CODE (type) == VECTOR_TYPE)
5149 return reshape_init_vector (type, d);
5154 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5155 brace-enclosed aggregate initializer.
5157 INIT is the CONSTRUCTOR containing the list of initializers describing
5158 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5159 It may not presently match the shape of the TYPE; for example:
5161 struct S { int a; int b; };
5162 struct S a[] = { 1, 2, 3, 4 };
5164 Here INIT will hold a VEC of four elements, rather than a
5165 VEC of two elements, each itself a VEC of two elements. This
5166 routine transforms INIT from the former form into the latter. The
5167 revised CONSTRUCTOR node is returned. */
5170 reshape_init (tree type, tree init)
5172 VEC(constructor_elt, gc) *v;
5176 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5178 v = CONSTRUCTOR_ELTS (init);
5180 /* An empty constructor does not need reshaping, and it is always a valid
5182 if (VEC_empty (constructor_elt, v))
5185 /* Recurse on this CONSTRUCTOR. */
5186 d.cur = VEC_index (constructor_elt, v, 0);
5187 d.end = d.cur + VEC_length (constructor_elt, v);
5189 new_init = reshape_init_r (type, &d, true);
5190 if (new_init == error_mark_node)
5191 return error_mark_node;
5193 /* Make sure all the element of the constructor were used. Otherwise,
5194 issue an error about exceeding initializers. */
5196 error ("too many initializers for %qT", type);
5201 /* Verify array initializer. Returns true if errors have been reported. */
5204 check_array_initializer (tree decl, tree type, tree init)
5206 tree element_type = TREE_TYPE (type);
5208 /* The array type itself need not be complete, because the
5209 initializer may tell us how many elements are in the array.
5210 But, the elements of the array must be complete. */
5211 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5214 error ("elements of array %q#D have incomplete type", decl);
5216 error ("elements of array %q#T have incomplete type", type);
5219 /* It is not valid to initialize a VLA. */
5221 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5222 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5225 error ("variable-sized object %qD may not be initialized", decl);
5227 error ("variable-sized compound literal");
5233 /* Subroutine of check_initializer; args are passed down from that function.
5234 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5237 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5240 int saved_stmts_are_full_exprs_p = 0;
5241 if (building_stmt_tree ())
5243 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5244 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5246 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5247 if (building_stmt_tree ())
5248 current_stmt_tree ()->stmts_are_full_exprs_p =
5249 saved_stmts_are_full_exprs_p;
5253 /* Verify INIT (the initializer for DECL), and record the
5254 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5255 grok_reference_init.
5257 If the return value is non-NULL, it is an expression that must be
5258 evaluated dynamically to initialize DECL. */
5261 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5263 tree type = TREE_TYPE (decl);
5264 tree init_code = NULL;
5265 tree extra_init = NULL_TREE;
5268 /* Things that are going to be initialized need to have complete
5270 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5272 if (type == error_mark_node)
5273 /* We will have already complained. */
5276 if (TREE_CODE (type) == ARRAY_TYPE)
5278 if (check_array_initializer (decl, type, init))
5281 else if (!COMPLETE_TYPE_P (type))
5283 error ("%qD has incomplete type", decl);
5284 TREE_TYPE (decl) = error_mark_node;
5288 /* There is no way to make a variable-sized class type in GNU C++. */
5289 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5291 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5293 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5294 if (SCALAR_TYPE_P (type))
5298 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5299 init = build_zero_init (type, NULL_TREE, false);
5301 else if (init_len != 1)
5303 error ("scalar object %qD requires one element in initializer",
5305 TREE_TYPE (decl) = error_mark_node;
5311 if (TREE_CODE (decl) == CONST_DECL)
5313 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5315 DECL_INITIAL (decl) = init;
5317 gcc_assert (init != NULL_TREE);
5320 else if (!init && DECL_REALLY_EXTERN (decl))
5322 else if (TREE_CODE (type) == REFERENCE_TYPE)
5323 init = grok_reference_init (decl, type, init, cleanup);
5324 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5327 check_for_uninitialized_const_var (decl);
5328 /* Do not reshape constructors of vectors (they don't need to be
5330 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5332 if (is_std_init_list (type))
5333 init = build_init_list_var_init (decl, type, init,
5334 &extra_init, cleanup);
5335 else if (TYPE_NON_AGGREGATE_CLASS (type))
5337 /* Don't reshape if the class has constructors. */
5338 if (cxx_dialect == cxx98)
5339 error ("in C++98 %qD must be initialized by constructor, "
5343 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5345 error ("opaque vector types cannot be initialized");
5346 init = error_mark_node;
5349 init = reshape_init (type, init);
5352 /* If DECL has an array type without a specific bound, deduce the
5353 array size from the initializer. */
5354 maybe_deduce_size_from_array_init (decl, init);
5355 type = TREE_TYPE (decl);
5356 if (type == error_mark_node)
5359 if (TYPE_NEEDS_CONSTRUCTING (type)
5360 || (CLASS_TYPE_P (type)
5361 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5363 init_code = build_aggr_init_full_exprs (decl, init, flags);
5365 /* If this is a constexpr initializer, expand_default_init will
5366 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5367 case, pull the initializer back out and pass it down into
5368 store_init_value. */
5369 while (TREE_CODE (init_code) == EXPR_STMT
5370 || TREE_CODE (init_code) == CONVERT_EXPR)
5371 init_code = TREE_OPERAND (init_code, 0);
5372 if (TREE_CODE (init_code) == INIT_EXPR)
5374 init = TREE_OPERAND (init_code, 1);
5375 init_code = NULL_TREE;
5376 /* Don't call digest_init; it's unnecessary and will complain
5377 about aggregate initialization of non-aggregate classes. */
5378 flags |= LOOKUP_ALREADY_DIGESTED;
5380 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5382 /* Declared constexpr, but no suitable initializer; massage
5383 init appropriately so we can pass it into store_init_value
5385 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5386 init = finish_compound_literal (type, init);
5387 else if (CLASS_TYPE_P (type)
5388 && (!init || TREE_CODE (init) == TREE_LIST))
5390 init = build_functional_cast (type, init, tf_none);
5391 if (init != error_mark_node)
5392 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5394 init_code = NULL_TREE;
5400 if (init && TREE_CODE (init) != TREE_VEC)
5402 init_code = store_init_value (decl, init, flags);
5403 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5404 && DECL_INITIAL (decl)
5405 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5406 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5407 warning (0, "array %qD initialized by parenthesized string literal %qE",
5408 decl, DECL_INITIAL (decl));
5414 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5415 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5416 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5417 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5420 check_for_uninitialized_const_var (decl);
5423 if (init && init != error_mark_node)
5424 init_code = build2 (INIT_EXPR, type, decl, init);
5427 init_code = add_stmt_to_compound (extra_init, init_code);
5429 if (init_code && DECL_IN_AGGR_P (decl))
5431 static int explained = 0;
5433 if (cxx_dialect < cxx0x)
5434 error ("initializer invalid for static member with constructor");
5436 error ("non-constant in-class initialization invalid for static "
5437 "member %qD", decl);
5440 error ("(an out of class initialization is required)");
5448 /* If DECL is not a local variable, give it RTL. */
5451 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5453 int toplev = toplevel_bindings_p ();
5455 const char *filename;
5457 /* Set the DECL_ASSEMBLER_NAME for the object. */
5460 /* The `register' keyword, when used together with an
5461 asm-specification, indicates that the variable should be
5462 placed in a particular register. */
5463 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5465 set_user_assembler_name (decl, asmspec);
5466 DECL_HARD_REGISTER (decl) = 1;
5470 if (TREE_CODE (decl) == FUNCTION_DECL
5471 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5472 set_builtin_user_assembler_name (decl, asmspec);
5473 set_user_assembler_name (decl, asmspec);
5477 /* Handle non-variables up front. */
5478 if (TREE_CODE (decl) != VAR_DECL)
5480 rest_of_decl_compilation (decl, toplev, at_eof);
5484 /* If we see a class member here, it should be a static data
5486 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5488 gcc_assert (TREE_STATIC (decl));
5489 /* An in-class declaration of a static data member should be
5490 external; it is only a declaration, and not a definition. */
5491 if (init == NULL_TREE)
5492 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5495 /* We don't create any RTL for local variables. */
5496 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5499 /* We defer emission of local statics until the corresponding
5500 DECL_EXPR is expanded. */
5501 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5503 /* We try to defer namespace-scope static constants so that they are
5504 not emitted into the object file unnecessarily. */
5505 filename = input_filename;
5506 if (!DECL_VIRTUAL_P (decl)
5507 && TREE_READONLY (decl)
5508 && DECL_INITIAL (decl) != NULL_TREE
5509 && DECL_INITIAL (decl) != error_mark_node
5511 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5513 && !TREE_PUBLIC (decl))
5515 /* Fool with the linkage of static consts according to #pragma
5517 struct c_fileinfo *finfo = get_fileinfo (filename);
5518 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5520 TREE_PUBLIC (decl) = 1;
5521 DECL_EXTERNAL (decl) = finfo->interface_only;
5526 /* Likewise for template instantiations. */
5527 else if (DECL_LANG_SPECIFIC (decl)
5528 && DECL_IMPLICIT_INSTANTIATION (decl))
5531 /* If we're not deferring, go ahead and assemble the variable. */
5533 rest_of_decl_compilation (decl, toplev, at_eof);
5536 /* walk_tree helper for wrap_temporary_cleanups, below. */
5539 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5541 if (TYPE_P (*stmt_p))
5547 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5549 tree guard = (tree)data;
5550 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5552 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5553 /* Tell honor_protect_cleanup_actions to handle this as a separate
5555 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5557 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5563 /* We're initializing a local variable which has a cleanup GUARD. If there
5564 are any temporaries used in the initializer INIT of this variable, we
5565 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5566 variable will be cleaned up properly if one of them throws.
5568 Unfortunately, there's no way to express this properly in terms of
5569 nesting, as the regions for the temporaries overlap the region for the
5570 variable itself; if there are two temporaries, the variable needs to be
5571 the first thing destroyed if either of them throws. However, we only
5572 want to run the variable's cleanup if it actually got constructed. So
5573 we need to guard the temporary cleanups with the variable's cleanup if
5574 they are run on the normal path, but not if they are run on the
5575 exceptional path. We implement this by telling
5576 honor_protect_cleanup_actions to strip the variable cleanup from the
5577 exceptional path. */
5580 wrap_temporary_cleanups (tree init, tree guard)
5582 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5585 /* Generate code to initialize DECL (a local variable). */
5588 initialize_local_var (tree decl, tree init)
5590 tree type = TREE_TYPE (decl);
5594 gcc_assert (TREE_CODE (decl) == VAR_DECL
5595 || TREE_CODE (decl) == RESULT_DECL);
5596 gcc_assert (!TREE_STATIC (decl));
5598 if (DECL_SIZE (decl) == NULL_TREE)
5600 /* If we used it already as memory, it must stay in memory. */
5601 DECL_INITIAL (decl) = NULL_TREE;
5602 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5606 if (type == error_mark_node)
5609 /* Compute and store the initial value. */
5610 already_used = TREE_USED (decl) || TREE_USED (type);
5611 if (TREE_USED (type))
5612 DECL_READ_P (decl) = 1;
5614 /* Generate a cleanup, if necessary. */
5615 cleanup = cxx_maybe_build_cleanup (decl);
5617 /* Perform the initialization. */
5620 int saved_stmts_are_full_exprs_p;
5622 /* If we're only initializing a single object, guard the destructors
5623 of any temporaries used in its initializer with its destructor.
5624 This isn't right for arrays because each element initialization is
5625 a full-expression. */
5626 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5627 wrap_temporary_cleanups (init, cleanup);
5629 gcc_assert (building_stmt_tree ());
5630 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5631 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5632 finish_expr_stmt (init);
5633 current_stmt_tree ()->stmts_are_full_exprs_p =
5634 saved_stmts_are_full_exprs_p;
5637 /* Set this to 0 so we can tell whether an aggregate which was
5638 initialized was ever used. Don't do this if it has a
5639 destructor, so we don't complain about the 'resource
5640 allocation is initialization' idiom. Now set
5641 attribute((unused)) on types so decls of that type will be
5642 marked used. (see TREE_USED, above.) */
5643 if (TYPE_NEEDS_CONSTRUCTING (type)
5645 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5646 && DECL_NAME (decl))
5647 TREE_USED (decl) = 0;
5648 else if (already_used)
5649 TREE_USED (decl) = 1;
5652 finish_decl_cleanup (decl, cleanup);
5655 /* DECL is a VAR_DECL for a compiler-generated variable with static
5656 storage duration (like a virtual table) whose initializer is a
5657 compile-time constant. Initialize the variable and provide it to the
5661 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5664 gcc_assert (DECL_ARTIFICIAL (decl));
5665 init = build_constructor (TREE_TYPE (decl), v);
5666 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5667 DECL_INITIAL (decl) = init;
5668 DECL_INITIALIZED_P (decl) = 1;
5669 determine_visibility (decl);
5670 layout_var_decl (decl);
5671 maybe_commonize_var (decl);
5672 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5675 /* INIT is the initializer for a variable, as represented by the
5676 parser. Returns true iff INIT is value-dependent. */
5679 value_dependent_init_p (tree init)
5681 if (TREE_CODE (init) == TREE_LIST)
5682 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5683 return any_value_dependent_elements_p (init);
5684 else if (TREE_CODE (init) == CONSTRUCTOR)
5685 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5687 VEC(constructor_elt, gc) *elts;
5691 elts = CONSTRUCTOR_ELTS (init);
5692 nelts = VEC_length (constructor_elt, elts);
5693 for (i = 0; i < nelts; ++i)
5694 if (value_dependent_init_p (VEC_index (constructor_elt,
5699 /* It must be a simple expression, e.g., int i = 3; */
5700 return value_dependent_expression_p (init);
5705 /* Finish processing of a declaration;
5706 install its line number and initial value.
5707 If the length of an array type is not known before,
5708 it must be determined now, from the initial value, or it is an error.
5710 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5711 true, then INIT is an integral constant expression.
5713 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5714 if the (init) syntax was used. */
5717 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5718 tree asmspec_tree, int flags)
5722 const char *asmspec = NULL;
5723 int was_readonly = 0;
5724 bool var_definition_p = false;
5725 int saved_processing_template_decl;
5728 if (decl == error_mark_node)
5733 error ("assignment (not initialization) in declaration");
5737 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5738 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5739 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5741 type = TREE_TYPE (decl);
5742 if (type == error_mark_node)
5745 /* Assume no cleanup is required. */
5746 cleanup = NULL_TREE;
5747 saved_processing_template_decl = processing_template_decl;
5749 /* If a name was specified, get the string. */
5750 if (global_scope_p (current_binding_level))
5751 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5752 if (asmspec_tree && asmspec_tree != error_mark_node)
5753 asmspec = TREE_STRING_POINTER (asmspec_tree);
5755 if (current_class_type
5756 && CP_DECL_CONTEXT (decl) == current_class_type
5757 && TYPE_BEING_DEFINED (current_class_type)
5758 && (DECL_INITIAL (decl) || init))
5759 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5761 auto_node = type_uses_auto (type);
5765 if (init == NULL_TREE)
5767 error ("declaration of %q#D has no initializer", decl);
5768 TREE_TYPE (decl) = error_mark_node;
5772 if (TREE_CODE (d_init) == TREE_LIST)
5773 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5774 tf_warning_or_error);
5775 d_init = resolve_nondeduced_context (d_init);
5776 if (describable_type (d_init))
5778 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5780 if (type == error_mark_node)
5785 if (TREE_CODE (decl) == FUNCTION_DECL)
5786 validate_constexpr_fundecl (decl);
5788 else if (!ensure_literal_type_for_constexpr_object (decl))
5789 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5791 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5794 if (init == ridpointers[(int)RID_DELETE])
5796 /* FIXME check this is 1st decl. */
5797 DECL_DELETED_FN (decl) = 1;
5798 DECL_DECLARED_INLINE_P (decl) = 1;
5799 DECL_INITIAL (decl) = error_mark_node;
5800 FOR_EACH_CLONE (clone, decl)
5802 DECL_DELETED_FN (clone) = 1;
5803 DECL_DECLARED_INLINE_P (clone) = 1;
5804 DECL_INITIAL (clone) = error_mark_node;
5808 else if (init == ridpointers[(int)RID_DEFAULT])
5810 if (defaultable_fn_check (decl))
5811 DECL_DEFAULTED_FN (decl) = 1;
5813 DECL_INITIAL (decl) = NULL_TREE;
5817 if (init && TREE_CODE (decl) == VAR_DECL)
5819 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5820 /* FIXME we rely on TREE_CONSTANT below; basing that on
5821 init_const_expr_p is probably wrong for C++0x. */
5822 if (init_const_expr_p)
5824 /* Set these flags now for C++98 templates. We'll update the
5825 flags in store_init_value for instantiations and C++0x. */
5826 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5827 if (decl_maybe_constant_var_p (decl))
5828 TREE_CONSTANT (decl) = 1;
5832 if (processing_template_decl)
5834 bool type_dependent_p;
5836 /* Add this declaration to the statement-tree. */
5837 if (at_function_scope_p ())
5838 add_decl_expr (decl);
5840 type_dependent_p = dependent_type_p (type);
5842 if (check_for_bare_parameter_packs (init))
5845 DECL_INITIAL (decl) = NULL_TREE;
5848 /* Generally, initializers in templates are expanded when the
5849 template is instantiated. But, if DECL is a variable constant
5850 then it can be used in future constant expressions, so its value
5851 must be available. */
5853 && DECL_CLASS_SCOPE_P (decl)
5854 /* We just set TREE_CONSTANT appropriately; see above. */
5855 && TREE_CONSTANT (decl)
5856 && !type_dependent_p
5857 /* FIXME non-value-dependent constant expression */
5858 && !value_dependent_init_p (init)))
5861 DECL_INITIAL (decl) = init;
5862 if (TREE_CODE (decl) == VAR_DECL
5863 && !DECL_PRETTY_FUNCTION_P (decl)
5864 && !type_dependent_p)
5865 maybe_deduce_size_from_array_init (decl, init);
5869 if (TREE_CODE (init) == TREE_LIST)
5871 /* If the parenthesized-initializer form was used (e.g.,
5872 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5873 arguments. (There is generally only one.) We convert them
5876 for (; list; list = TREE_CHAIN (list))
5878 tree elt = TREE_VALUE (list);
5879 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5883 init = fold_non_dependent_expr (init);
5884 processing_template_decl = 0;
5887 /* Take care of TYPE_DECLs up front. */
5888 if (TREE_CODE (decl) == TYPE_DECL)
5890 if (type != error_mark_node
5891 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5893 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5894 warning (0, "shadowing previous type declaration of %q#D", decl);
5895 set_identifier_type_value (DECL_NAME (decl), decl);
5898 /* If we have installed this as the canonical typedef for this
5899 type, and that type has not been defined yet, delay emitting
5900 the debug information for it, as we will emit it later. */
5901 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5902 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5903 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5905 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5910 /* A reference will be modified here, as it is initialized. */
5911 if (! DECL_EXTERNAL (decl)
5912 && TREE_READONLY (decl)
5913 && TREE_CODE (type) == REFERENCE_TYPE)
5916 TREE_READONLY (decl) = 0;
5919 if (TREE_CODE (decl) == VAR_DECL)
5921 /* Only variables with trivial initialization and destruction can
5922 have thread-local storage. */
5923 if (DECL_THREAD_LOCAL_P (decl)
5924 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5925 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5926 error ("%qD cannot be thread-local because it has non-trivial "
5927 "type %qT", decl, TREE_TYPE (decl));
5928 /* If this is a local variable that will need a mangled name,
5929 register it now. We must do this before processing the
5930 initializer for the variable, since the initialization might
5931 require a guard variable, and since the mangled name of the
5932 guard variable will depend on the mangled name of this
5934 if (DECL_FUNCTION_SCOPE_P (decl)
5935 && TREE_STATIC (decl)
5936 && !DECL_ARTIFICIAL (decl))
5938 push_local_name (decl);
5939 if (DECL_CONSTRUCTOR_P (current_function_decl)
5940 || DECL_DESTRUCTOR_P (current_function_decl))
5941 /* Normally local_decls is populated during GIMPLE lowering,
5942 but [cd]tors are never actually compiled directly. We need
5943 to put statics on the list so we can deal with the label
5944 address extension. */
5945 add_local_decl (cfun, decl);
5948 /* Convert the initializer to the type of DECL, if we have not
5949 already initialized DECL. */
5950 if (!DECL_INITIALIZED_P (decl)
5951 /* If !DECL_EXTERNAL then DECL is being defined. In the
5952 case of a static data member initialized inside the
5953 class-specifier, there can be an initializer even if DECL
5954 is *not* defined. */
5955 && (!DECL_EXTERNAL (decl) || init))
5957 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5960 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5961 /* Allow libjava/prims.cc define primitive classes. */
5962 if (init != NULL_TREE
5963 || jclass == NULL_TREE
5964 || TREE_CODE (jclass) != TYPE_DECL
5965 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5966 || !same_type_ignoring_top_level_qualifiers_p
5967 (type, TREE_TYPE (TREE_TYPE (jclass))))
5968 error ("Java object %qD not allocated with %<new%>", decl);
5971 init = check_initializer (decl, init, flags, &cleanup);
5972 /* Thread-local storage cannot be dynamically initialized. */
5973 if (DECL_THREAD_LOCAL_P (decl) && init)
5975 error ("%qD is thread-local and so cannot be dynamically "
5976 "initialized", decl);
5980 /* Check that the initializer for a static data member was a
5981 constant. Although we check in the parser that the
5982 initializer is an integral constant expression, we do not
5983 simplify division-by-zero at the point at which it
5984 occurs. Therefore, in:
5986 struct S { static const int i = 7 / 0; };
5988 we issue an error at this point. It would
5989 probably be better to forbid division by zero in
5990 integral constant expressions. */
5991 if (DECL_EXTERNAL (decl) && init)
5993 error ("%qD cannot be initialized by a non-constant expression"
5994 " when being declared", decl);
5995 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6003 The memory occupied by any object of static storage
6004 duration is zero-initialized at program startup before
6005 any other initialization takes place.
6007 We cannot create an appropriate initializer until after
6008 the type of DECL is finalized. If DECL_INITIAL is set,
6009 then the DECL is statically initialized, and any
6010 necessary zero-initialization has already been performed. */
6011 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6012 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6013 /*nelts=*/NULL_TREE,
6014 /*static_storage_p=*/true);
6015 /* Remember that the initialization for this variable has
6017 DECL_INITIALIZED_P (decl) = 1;
6018 /* This declaration is the definition of this variable,
6019 unless we are initializing a static data member within
6020 the class specifier. */
6021 if (!DECL_EXTERNAL (decl))
6022 var_definition_p = true;
6024 /* If the variable has an array type, lay out the type, even if
6025 there is no initializer. It is valid to index through the
6026 array, and we must get TYPE_ALIGN set correctly on the array
6028 else if (TREE_CODE (type) == ARRAY_TYPE)
6031 if (!processing_template_decl
6032 && TREE_STATIC (decl)
6033 && !at_function_scope_p ()
6034 && current_function_decl == NULL)
6035 /* So decl is a global variable or a static member of a
6036 non local class. Record the types it uses
6037 so that we can decide later to emit debug info for them. */
6038 record_types_used_by_current_var_decl (decl);
6040 else if (TREE_CODE (decl) == FIELD_DECL
6041 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6042 error ("non-static data member %qD has Java class type", decl);
6044 /* Add this declaration to the statement-tree. This needs to happen
6045 after the call to check_initializer so that the DECL_EXPR for a
6046 reference temp is added before the DECL_EXPR for the reference itself. */
6047 if (at_function_scope_p ())
6048 add_decl_expr (decl);
6050 /* Let the middle end know about variables and functions -- but not
6051 static data members in uninstantiated class templates. */
6052 if (!saved_processing_template_decl
6053 && (TREE_CODE (decl) == VAR_DECL
6054 || TREE_CODE (decl) == FUNCTION_DECL))
6056 if (TREE_CODE (decl) == VAR_DECL)
6058 layout_var_decl (decl);
6059 maybe_commonize_var (decl);
6062 /* This needs to happen after the linkage is set. */
6063 determine_visibility (decl);
6065 if (var_definition_p && TREE_STATIC (decl))
6067 /* If a TREE_READONLY variable needs initialization
6068 at runtime, it is no longer readonly and we need to
6069 avoid MEM_READONLY_P being set on RTL created for it. */
6072 if (TREE_READONLY (decl))
6073 TREE_READONLY (decl) = 0;
6076 else if (was_readonly)
6077 TREE_READONLY (decl) = 1;
6080 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6082 /* Check for abstractness of the type. Notice that there is no
6083 need to strip array types here since the check for those types
6084 is already done within create_array_type_for_decl. */
6085 if (TREE_CODE (type) == FUNCTION_TYPE
6086 || TREE_CODE (type) == METHOD_TYPE)
6087 abstract_virtuals_error (decl, TREE_TYPE (type));
6089 abstract_virtuals_error (decl, type);
6091 if (TREE_TYPE (decl) == error_mark_node)
6092 /* No initialization required. */
6094 else if (TREE_CODE (decl) == FUNCTION_DECL)
6098 if (init == ridpointers[(int)RID_DEFAULT])
6100 /* An out-of-class default definition is defined at
6101 the point where it is explicitly defaulted. */
6102 if (DECL_DELETED_FN (decl))
6103 maybe_explain_implicit_delete (decl);
6104 else if (DECL_INITIAL (decl) == error_mark_node)
6105 synthesize_method (decl);
6108 error ("function %q#D is initialized like a variable", decl);
6110 /* else no initialization required. */
6112 else if (DECL_EXTERNAL (decl)
6113 && ! (DECL_LANG_SPECIFIC (decl)
6114 && DECL_NOT_REALLY_EXTERN (decl)))
6117 DECL_INITIAL (decl) = init;
6119 /* A variable definition. */
6120 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6121 /* Initialize the local variable. */
6122 initialize_local_var (decl, init);
6124 /* If a variable is defined, and then a subsequent
6125 definition with external linkage is encountered, we will
6126 get here twice for the same variable. We want to avoid
6127 calling expand_static_init more than once. For variables
6128 that are not static data members, we can call
6129 expand_static_init only when we actually process the
6130 initializer. It is not legal to redeclare a static data
6131 member, so this issue does not arise in that case. */
6132 else if (var_definition_p && TREE_STATIC (decl))
6133 expand_static_init (decl, init);
6136 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6137 reference, insert it in the statement-tree now. */
6139 push_cleanup (decl, cleanup, false);
6142 processing_template_decl = saved_processing_template_decl;
6145 TREE_READONLY (decl) = 1;
6148 /* Returns a declaration for a VAR_DECL as if:
6150 extern "C" TYPE NAME;
6152 had been seen. Used to create compiler-generated global
6156 declare_global_var (tree name, tree type)
6160 push_to_top_level ();
6161 decl = build_decl (input_location, VAR_DECL, name, type);
6162 TREE_PUBLIC (decl) = 1;
6163 DECL_EXTERNAL (decl) = 1;
6164 DECL_ARTIFICIAL (decl) = 1;
6165 /* If the user has explicitly declared this variable (perhaps
6166 because the code we are compiling is part of a low-level runtime
6167 library), then it is possible that our declaration will be merged
6168 with theirs by pushdecl. */
6169 decl = pushdecl (decl);
6170 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6171 pop_from_top_level ();
6176 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6177 if "__cxa_atexit" is not being used) corresponding to the function
6178 to be called when the program exits. */
6181 get_atexit_fn_ptr_type (void)
6185 if (!atexit_fn_ptr_type_node)
6188 if (flag_use_cxa_atexit
6189 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6190 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6191 arg_type = ptr_type_node;
6193 /* The parameter to "atexit" is "void (*)(void)". */
6194 arg_type = NULL_TREE;
6196 fn_type = build_function_type_list (void_type_node,
6197 arg_type, NULL_TREE);
6198 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6201 return atexit_fn_ptr_type_node;
6204 /* Returns a pointer to the `atexit' function. Note that if
6205 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6206 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6209 get_atexit_node (void)
6215 bool use_aeabi_atexit;
6220 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6222 /* The declaration for `__cxa_atexit' is:
6224 int __cxa_atexit (void (*)(void *), void *, void *)
6226 We build up the argument types and then the function type
6228 tree argtype0, argtype1, argtype2;
6230 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6231 /* First, build the pointer-to-function type for the first
6233 fn_ptr_type = get_atexit_fn_ptr_type ();
6234 /* Then, build the rest of the argument types. */
6235 argtype2 = ptr_type_node;
6236 if (use_aeabi_atexit)
6238 argtype1 = fn_ptr_type;
6239 argtype0 = ptr_type_node;
6243 argtype1 = ptr_type_node;
6244 argtype0 = fn_ptr_type;
6246 /* And the final __cxa_atexit type. */
6247 fn_type = build_function_type_list (integer_type_node,
6248 argtype0, argtype1, argtype2,
6250 fn_ptr_type = build_pointer_type (fn_type);
6251 if (use_aeabi_atexit)
6252 name = "__aeabi_atexit";
6254 name = "__cxa_atexit";
6258 /* The declaration for `atexit' is:
6260 int atexit (void (*)());
6262 We build up the argument types and then the function type
6264 fn_ptr_type = get_atexit_fn_ptr_type ();
6265 /* Build the final atexit type. */
6266 fn_type = build_function_type_list (integer_type_node,
6267 fn_ptr_type, NULL_TREE);
6271 /* Now, build the function declaration. */
6272 push_lang_context (lang_name_c);
6273 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6274 mark_used (atexit_fndecl);
6275 pop_lang_context ();
6276 atexit_node = decay_conversion (atexit_fndecl);
6281 /* Returns the __dso_handle VAR_DECL. */
6284 get_dso_handle_node (void)
6286 if (dso_handle_node)
6287 return dso_handle_node;
6289 /* Declare the variable. */
6290 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6293 return dso_handle_node;
6296 /* Begin a new function with internal linkage whose job will be simply
6297 to destroy some particular variable. */
6299 static GTY(()) int start_cleanup_cnt;
6302 start_cleanup_fn (void)
6307 bool use_cxa_atexit = flag_use_cxa_atexit
6308 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6310 push_to_top_level ();
6312 /* No need to mangle this. */
6313 push_lang_context (lang_name_c);
6315 /* Build the name of the function. */
6316 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6317 /* Build the function declaration. */
6318 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6319 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6320 /* It's a function with internal linkage, generated by the
6322 TREE_PUBLIC (fndecl) = 0;
6323 DECL_ARTIFICIAL (fndecl) = 1;
6324 /* Make the function `inline' so that it is only emitted if it is
6325 actually needed. It is unlikely that it will be inlined, since
6326 it is only called via a function pointer, but we avoid unnecessary
6327 emissions this way. */
6328 DECL_DECLARED_INLINE_P (fndecl) = 1;
6329 DECL_INTERFACE_KNOWN (fndecl) = 1;
6330 /* Build the parameter. */
6335 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6336 DECL_CONTEXT (parmdecl) = fndecl;
6337 TREE_USED (parmdecl) = 1;
6338 DECL_READ_P (parmdecl) = 1;
6339 DECL_ARGUMENTS (fndecl) = parmdecl;
6343 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6345 pop_lang_context ();
6347 return current_function_decl;
6350 /* Finish the cleanup function begun by start_cleanup_fn. */
6353 end_cleanup_fn (void)
6355 expand_or_defer_fn (finish_function (0));
6357 pop_from_top_level ();
6360 /* Generate code to handle the destruction of DECL, an object with
6361 static storage duration. */
6364 register_dtor_fn (tree decl)
6371 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6373 type = TREE_TYPE (decl);
6374 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6375 return void_zero_node;
6377 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6378 a class object, we can just pass the destructor to
6379 "__cxa_atexit"; we don't have to build a temporary function to do
6381 use_dtor = (flag_use_cxa_atexit
6382 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6383 && CLASS_TYPE_P (type));
6388 /* Find the destructor. */
6389 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6390 gcc_assert (idx >= 0);
6391 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6392 /* Make sure it is accessible. */
6393 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6397 /* Call build_cleanup before we enter the anonymous function so
6398 that any access checks will be done relative to the current
6399 scope, rather than the scope of the anonymous function. */
6400 build_cleanup (decl);
6402 /* Now start the function. */
6403 cleanup = start_cleanup_fn ();
6405 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6406 to the original function, rather than the anonymous one. That
6407 will make the back end think that nested functions are in use,
6408 which causes confusion. */
6409 push_deferring_access_checks (dk_no_check);
6410 fcall = build_cleanup (decl);
6411 pop_deferring_access_checks ();
6413 /* Create the body of the anonymous function. */
6414 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6415 finish_expr_stmt (fcall);
6416 finish_compound_stmt (compound_stmt);
6420 /* Call atexit with the cleanup function. */
6421 mark_used (cleanup);
6422 cleanup = build_address (cleanup);
6423 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6429 /* We must convert CLEANUP to the type that "__cxa_atexit"
6431 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6432 /* "__cxa_atexit" will pass the address of DECL to the
6433 cleanup function. */
6435 addr = build_address (decl);
6436 /* The declared type of the parameter to "__cxa_atexit" is
6437 "void *". For plain "T*", we could just let the
6438 machinery in cp_build_function_call convert it -- but if the
6439 type is "cv-qualified T *", then we need to convert it
6440 before passing it in, to avoid spurious errors. */
6441 addr = build_nop (ptr_type_node, addr);
6444 /* Since the cleanup functions we build ignore the address
6445 they're given, there's no reason to pass the actual address
6446 in, and, in general, it's cheaper to pass NULL than any
6448 addr = null_pointer_node;
6449 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6450 tf_warning_or_error);
6451 if (targetm.cxx.use_aeabi_atexit ())
6464 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6465 arg0, arg1, arg2, NULL_TREE);
6468 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6469 is its initializer. Generate code to handle the construction
6470 and destruction of DECL. */
6473 expand_static_init (tree decl, tree init)
6475 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6476 gcc_assert (TREE_STATIC (decl));
6478 /* Some variables require no dynamic initialization. */
6480 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6483 if (DECL_FUNCTION_SCOPE_P (decl))
6485 /* Emit code to perform this initialization but once. */
6486 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6487 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6488 tree guard, guard_addr;
6489 tree acquire_fn, release_fn, abort_fn;
6492 /* Emit code to perform this initialization but once. This code
6495 static <type> guard;
6496 if (!guard.first_byte) {
6497 if (__cxa_guard_acquire (&guard)) {
6500 // Do initialization.
6501 flag = true; __cxa_guard_release (&guard);
6502 // Register variable for destruction at end of program.
6504 if (!flag) __cxa_guard_abort (&guard);
6508 Note that the `flag' variable is only set to 1 *after* the
6509 initialization is complete. This ensures that an exception,
6510 thrown during the construction, will cause the variable to
6511 reinitialized when we pass through this code again, as per:
6515 If the initialization exits by throwing an exception, the
6516 initialization is not complete, so it will be tried again
6517 the next time control enters the declaration.
6519 This process should be thread-safe, too; multiple threads
6520 should not be able to initialize the variable more than
6523 /* Create the guard variable. */
6524 guard = get_guard (decl);
6526 /* This optimization isn't safe on targets with relaxed memory
6527 consistency. On such targets we force synchronization in
6528 __cxa_guard_acquire. */
6529 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6531 /* Begin the conditional initialization. */
6532 if_stmt = begin_if_stmt ();
6533 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6534 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6537 if (flag_threadsafe_statics)
6539 guard_addr = build_address (guard);
6541 acquire_fn = get_identifier ("__cxa_guard_acquire");
6542 release_fn = get_identifier ("__cxa_guard_release");
6543 abort_fn = get_identifier ("__cxa_guard_abort");
6544 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6546 tree vfntype = build_function_type_list (void_type_node,
6547 TREE_TYPE (guard_addr),
6549 acquire_fn = push_library_fn
6550 (acquire_fn, build_function_type_list (integer_type_node,
6551 TREE_TYPE (guard_addr),
6554 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6555 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6559 release_fn = identifier_global_value (release_fn);
6560 abort_fn = identifier_global_value (abort_fn);
6563 inner_if_stmt = begin_if_stmt ();
6564 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6567 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6568 begin = get_target_expr (boolean_false_node);
6569 flag = TARGET_EXPR_SLOT (begin);
6571 TARGET_EXPR_CLEANUP (begin)
6572 = build3 (COND_EXPR, void_type_node, flag,
6574 build_call_n (abort_fn, 1, guard_addr));
6575 CLEANUP_EH_ONLY (begin) = 1;
6577 /* Do the initialization itself. */
6578 init = add_stmt_to_compound (begin, init);
6579 init = add_stmt_to_compound
6580 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6581 init = add_stmt_to_compound
6582 (init, build_call_n (release_fn, 1, guard_addr));
6585 init = add_stmt_to_compound (init, set_guard (guard));
6587 /* Use atexit to register a function for destroying this static
6589 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6591 finish_expr_stmt (init);
6593 if (flag_threadsafe_statics)
6595 finish_compound_stmt (inner_then_clause);
6596 finish_then_clause (inner_if_stmt);
6597 finish_if_stmt (inner_if_stmt);
6600 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6602 finish_compound_stmt (then_clause);
6603 finish_then_clause (if_stmt);
6604 finish_if_stmt (if_stmt);
6608 static_aggregates = tree_cons (init, decl, static_aggregates);
6612 /* Make TYPE a complete type based on INITIAL_VALUE.
6613 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6614 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6615 3 if the initializer list is empty (in pedantic mode). */
6618 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6621 tree type, elt_type;
6625 unsigned HOST_WIDE_INT i;
6628 /* An array of character type can be initialized from a
6629 brace-enclosed string constant.
6631 FIXME: this code is duplicated from reshape_init. Probably
6632 we should just call reshape_init here? */
6633 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6634 && TREE_CODE (initial_value) == CONSTRUCTOR
6635 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6637 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6638 tree value = VEC_index (constructor_elt, v, 0)->value;
6640 if (TREE_CODE (value) == STRING_CST
6641 && VEC_length (constructor_elt, v) == 1)
6642 initial_value = value;
6645 /* If any of the elements are parameter packs, we can't actually
6646 complete this type now because the array size is dependent. */
6647 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6649 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6652 if (PACK_EXPANSION_P (value))
6658 failure = complete_array_type (ptype, initial_value, do_default);
6660 /* We can create the array before the element type is complete, which
6661 means that we didn't have these two bits set in the original type
6662 either. In completing the type, we are expected to propagate these
6663 bits. See also complete_type which does the same thing for arrays
6666 if (TYPE_DOMAIN (type))
6668 elt_type = TREE_TYPE (type);
6669 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6670 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6671 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6677 /* Return zero if something is declared to be a member of type
6678 CTYPE when in the context of CUR_TYPE. STRING is the error
6679 message to print in that case. Otherwise, quietly return 1. */
6682 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6684 if (ctype && ctype != cur_type)
6686 if (flags == DTOR_FLAG)
6687 error ("destructor for alien class %qT cannot be a member", ctype);
6689 error ("constructor for alien class %qT cannot be a member", ctype);
6695 /* Subroutine of `grokdeclarator'. */
6697 /* Generate errors possibly applicable for a given set of specifiers.
6698 This is for ARM $7.1.2. */
6701 bad_specifiers (tree object,
6702 enum bad_spec_place type,
6713 error ("%qD declared as a %<virtual%> variable", object);
6715 error ("%qD declared as an %<inline%> variable", object);
6717 error ("%<const%> and %<volatile%> function specifiers on "
6718 "%qD invalid in variable declaration", object);
6722 error ("%qD declared as a %<virtual%> parameter", object);
6724 error ("%qD declared as an %<inline%> parameter", object);
6726 error ("%<const%> and %<volatile%> function specifiers on "
6727 "%qD invalid in parameter declaration", object);
6731 error ("%qD declared as a %<virtual%> type", object);
6733 error ("%qD declared as an %<inline%> type", object);
6735 error ("%<const%> and %<volatile%> function specifiers on "
6736 "%qD invalid in type declaration", object);
6740 error ("%qD declared as a %<virtual%> field", object);
6742 error ("%qD declared as an %<inline%> field", object);
6744 error ("%<const%> and %<volatile%> function specifiers on "
6745 "%qD invalid in field declaration", object);
6751 error ("%q+D declared as a friend", object);
6753 && (TREE_CODE (object) == TYPE_DECL
6754 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6755 && !TYPE_REFFN_P (TREE_TYPE (object))
6756 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6757 error ("%q+D declared with an exception specification", object);
6760 /* DECL is a member function or static data member and is presently
6761 being defined. Check that the definition is taking place in a
6765 check_class_member_definition_namespace (tree decl)
6767 /* These checks only apply to member functions and static data
6769 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6770 || TREE_CODE (decl) == VAR_DECL);
6771 /* We check for problems with specializations in pt.c in
6772 check_specialization_namespace, where we can issue better
6774 if (processing_specialization)
6776 /* There are no restrictions on the placement of
6777 explicit instantiations. */
6778 if (processing_explicit_instantiation)
6782 A member function definition that appears outside of the
6783 class definition shall appear in a namespace scope enclosing
6784 the class definition.
6788 The definition for a static data member shall appear in a
6789 namespace scope enclosing the member's class definition. */
6790 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6791 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6792 decl, DECL_CONTEXT (decl));
6795 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6796 METHOD_TYPE for a non-static member function; QUALS are the
6797 cv-qualifiers that apply to the function. */
6800 build_this_parm (tree type, cp_cv_quals quals)
6805 cp_cv_quals this_quals;
6807 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6808 /* The `this' parameter is implicitly `const'; it cannot be
6810 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6811 qual_type = cp_build_qualified_type (this_type, this_quals);
6812 parm = build_artificial_parm (this_identifier, qual_type);
6813 cp_apply_type_quals_to_decl (this_quals, parm);
6817 /* CTYPE is class type, or null if non-class.
6818 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6820 DECLARATOR is the function's name.
6821 PARMS is a chain of PARM_DECLs for the function.
6822 VIRTUALP is truthvalue of whether the function is virtual or not.
6823 FLAGS are to be passed through to `grokclassfn'.
6824 QUALS are qualifiers indicating whether the function is `const'
6826 RAISES is a list of exceptions that this function can raise.
6827 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6828 not look, and -1 if we should not call `grokclassfn' at all.
6830 SFK is the kind of special function (if any) for the new function.
6832 Returns `NULL_TREE' if something goes wrong, after issuing
6833 applicable error messages. */
6836 grokfndecl (tree ctype,
6840 tree orig_declarator,
6842 enum overload_flags flags,
6849 special_function_kind sfk,
6854 location_t location)
6857 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6861 type = build_exception_variant (type, raises);
6863 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6865 /* If we have an explicit location, use it, otherwise use whatever
6866 build_lang_decl used (probably input_location). */
6867 if (location != UNKNOWN_LOCATION)
6868 DECL_SOURCE_LOCATION (decl) = location;
6870 if (TREE_CODE (type) == METHOD_TYPE)
6873 parm = build_this_parm (type, quals);
6874 DECL_CHAIN (parm) = parms;
6877 DECL_ARGUMENTS (decl) = parms;
6878 for (t = parms; t; t = DECL_CHAIN (t))
6879 DECL_CONTEXT (t) = decl;
6880 /* Propagate volatile out from type to decl. */
6881 if (TYPE_VOLATILE (type))
6882 TREE_THIS_VOLATILE (decl) = 1;
6884 /* Setup decl according to sfk. */
6887 case sfk_constructor:
6888 case sfk_copy_constructor:
6889 case sfk_move_constructor:
6890 DECL_CONSTRUCTOR_P (decl) = 1;
6892 case sfk_destructor:
6893 DECL_DESTRUCTOR_P (decl) = 1;
6899 /* If pointers to member functions use the least significant bit to
6900 indicate whether a function is virtual, ensure a pointer
6901 to this function will have that bit clear. */
6902 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6903 && TREE_CODE (type) == METHOD_TYPE
6904 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6905 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6908 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6912 ("defining explicit specialization %qD in friend declaration",
6916 tree fns = TREE_OPERAND (orig_declarator, 0);
6917 tree args = TREE_OPERAND (orig_declarator, 1);
6919 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6921 /* Something like `template <class T> friend void f<T>()'. */
6922 error ("invalid use of template-id %qD in declaration "
6923 "of primary template",
6929 /* A friend declaration of the form friend void f<>(). Record
6930 the information in the TEMPLATE_ID_EXPR. */
6931 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6933 if (TREE_CODE (fns) == COMPONENT_REF)
6935 /* Due to bison parser ickiness, we will have already looked
6936 up an operator_name or PFUNCNAME within the current class
6937 (see template_id in parse.y). If the current class contains
6938 such a name, we'll get a COMPONENT_REF here. Undo that. */
6940 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6941 == current_class_type);
6942 fns = TREE_OPERAND (fns, 1);
6944 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6945 || TREE_CODE (fns) == OVERLOAD);
6946 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6948 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6949 if (TREE_PURPOSE (t)
6950 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6952 error ("default arguments are not allowed in declaration "
6953 "of friend template specialization %qD",
6960 error ("%<inline%> is not allowed in declaration of friend "
6961 "template specialization %qD",
6968 /* If this decl has namespace scope, set that up. */
6970 set_decl_namespace (decl, in_namespace, friendp);
6972 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6974 /* `main' and builtins have implicit 'C' linkage. */
6975 if ((MAIN_NAME_P (declarator)
6976 || (IDENTIFIER_LENGTH (declarator) > 10
6977 && IDENTIFIER_POINTER (declarator)[0] == '_'
6978 && IDENTIFIER_POINTER (declarator)[1] == '_'
6979 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6980 && current_lang_name == lang_name_cplusplus
6981 && ctype == NULL_TREE
6982 && DECL_FILE_SCOPE_P (decl))
6983 SET_DECL_LANGUAGE (decl, lang_c);
6985 /* Should probably propagate const out from type to decl I bet (mrs). */
6988 DECL_STATIC_FUNCTION_P (decl) = 1;
6989 DECL_CONTEXT (decl) = ctype;
6994 DECL_CONTEXT (decl) = ctype;
6996 check_class_member_definition_namespace (decl);
6999 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7001 if (processing_template_decl)
7002 error ("cannot declare %<::main%> to be a template");
7004 error ("cannot declare %<::main%> to be inline");
7006 error ("cannot declare %<::main%> to be static");
7011 /* Members of anonymous types and local classes have no linkage; make
7012 them internal. If a typedef is made later, this will be changed. */
7013 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7014 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7017 if (publicp && cxx_dialect == cxx98)
7019 /* [basic.link]: A name with no linkage (notably, the name of a class
7020 or enumeration declared in a local scope) shall not be used to
7021 declare an entity with linkage.
7023 DR 757 relaxes this restriction for C++0x. */
7024 t = no_linkage_check (TREE_TYPE (decl),
7025 /*relaxed_p=*/false);
7028 if (TYPE_ANONYMOUS_P (t))
7030 if (DECL_EXTERN_C_P (decl))
7031 /* Allow this; it's pretty common in C. */;
7034 permerror (input_location, "anonymous type with no linkage "
7035 "used to declare function %q#D with linkage",
7037 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7038 permerror (input_location, "%q+#D does not refer to the unqualified "
7039 "type, so it is not used for linkage",
7044 permerror (input_location, "type %qT with no linkage used to "
7045 "declare function %q#D with linkage", t, decl);
7049 TREE_PUBLIC (decl) = publicp;
7052 DECL_INTERFACE_KNOWN (decl) = 1;
7053 DECL_NOT_REALLY_EXTERN (decl) = 1;
7056 /* If the declaration was declared inline, mark it as such. */
7058 DECL_DECLARED_INLINE_P (decl) = 1;
7060 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7062 DECL_EXTERNAL (decl) = 1;
7063 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7066 ? G_("static member function %qD cannot have cv-qualifier")
7067 : G_("non-member function %qD cannot have cv-qualifier"),
7069 quals = TYPE_UNQUALIFIED;
7072 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7073 && !grok_op_properties (decl, /*complain=*/true))
7077 /* Make the init_value nonzero so pushdecl knows this is not
7078 tentative. error_mark_node is replaced later with the BLOCK. */
7079 DECL_INITIAL (decl) = error_mark_node;
7081 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7082 TREE_NOTHROW (decl) = 1;
7084 /* Caller will do the rest of this. */
7088 if (ctype != NULL_TREE)
7089 grokclassfn (ctype, decl, flags);
7091 decl = check_explicit_specialization (orig_declarator, decl,
7094 4 * (friendp != 0));
7095 if (decl == error_mark_node)
7100 cplus_decl_attributes (&decl, *attrlist, 0);
7101 *attrlist = NULL_TREE;
7104 /* Check main's type after attributes have been applied. */
7105 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7107 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7110 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7112 error ("%<::main%> must return %<int%>");
7113 newtype = build_function_type (integer_type_node, oldtypeargs);
7114 TREE_TYPE (decl) = newtype;
7117 check_main_parameter_types (decl);
7120 if (ctype != NULL_TREE
7121 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7124 tree old_decl = check_classfn (ctype, decl,
7125 (processing_template_decl
7126 > template_class_depth (ctype))
7127 ? current_template_parms
7130 if (old_decl == error_mark_node)
7138 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7139 /* Because grokfndecl is always supposed to return a
7140 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7141 here. We depend on our callers to figure out that its
7142 really a template that's being returned. */
7143 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7145 if (DECL_STATIC_FUNCTION_P (old_decl)
7146 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7147 /* Remove the `this' parm added by grokclassfn.
7148 XXX Isn't this done in start_function, too? */
7149 revert_static_member_fn (decl);
7150 if (DECL_ARTIFICIAL (old_decl))
7152 error ("definition of implicitly-declared %qD", old_decl);
7156 /* Since we've smashed OLD_DECL to its
7157 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7158 if (TREE_CODE (decl) == TEMPLATE_DECL)
7159 decl = DECL_TEMPLATE_RESULT (decl);
7161 /* Attempt to merge the declarations. This can fail, in
7162 the case of some invalid specialization declarations. */
7163 pushed_scope = push_scope (ctype);
7164 ok = duplicate_decls (decl, old_decl, friendp);
7166 pop_scope (pushed_scope);
7169 error ("no %q#D member function declared in class %qT",
7177 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7180 if (ctype == NULL_TREE || check)
7184 DECL_VIRTUAL_P (decl) = 1;
7189 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7190 the linkage that DECL will receive in the object file. */
7193 set_linkage_for_static_data_member (tree decl)
7195 /* A static data member always has static storage duration and
7196 external linkage. Note that static data members are forbidden in
7197 local classes -- the only situation in which a class has
7198 non-external linkage. */
7199 TREE_PUBLIC (decl) = 1;
7200 TREE_STATIC (decl) = 1;
7201 /* For non-template classes, static data members are always put
7202 out in exactly those files where they are defined, just as
7203 with ordinary namespace-scope variables. */
7204 if (!processing_template_decl)
7205 DECL_INTERFACE_KNOWN (decl) = 1;
7208 /* Create a VAR_DECL named NAME with the indicated TYPE.
7210 If SCOPE is non-NULL, it is the class type or namespace containing
7211 the variable. If SCOPE is NULL, the variable should is created in
7212 the innermost enclosings scope. */
7215 grokvardecl (tree type,
7217 const cp_decl_specifier_seq *declspecs,
7223 tree explicit_scope;
7225 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7227 /* Compute the scope in which to place the variable, but remember
7228 whether or not that scope was explicitly specified by the user. */
7229 explicit_scope = scope;
7232 /* An explicit "extern" specifier indicates a namespace-scope
7234 if (declspecs->storage_class == sc_extern)
7235 scope = current_decl_namespace ();
7236 else if (!at_function_scope_p ())
7237 scope = current_scope ();
7241 && (/* If the variable is a namespace-scope variable declared in a
7242 template, we need DECL_LANG_SPECIFIC. */
7243 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7244 /* Similarly for namespace-scope variables with language linkage
7246 || (TREE_CODE (scope) == NAMESPACE_DECL
7247 && current_lang_name != lang_name_cplusplus)
7248 /* Similarly for static data members. */
7250 decl = build_lang_decl (VAR_DECL, name, type);
7252 decl = build_decl (input_location, VAR_DECL, name, type);
7254 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7255 set_decl_namespace (decl, explicit_scope, 0);
7257 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7259 if (declspecs->storage_class == sc_extern)
7261 DECL_THIS_EXTERN (decl) = 1;
7262 DECL_EXTERNAL (decl) = !initialized;
7265 if (DECL_CLASS_SCOPE_P (decl))
7267 set_linkage_for_static_data_member (decl);
7268 /* This function is only called with out-of-class definitions. */
7269 DECL_EXTERNAL (decl) = 0;
7270 check_class_member_definition_namespace (decl);
7272 /* At top level, either `static' or no s.c. makes a definition
7273 (perhaps tentative), and absence of `static' makes it public. */
7274 else if (toplevel_bindings_p ())
7276 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7277 && (DECL_THIS_EXTERN (decl) || ! constp));
7278 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7280 /* Not at top level, only `static' makes a static definition. */
7283 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7284 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7287 if (declspecs->specs[(int)ds_thread])
7288 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7290 /* If the type of the decl has no linkage, make sure that we'll
7291 notice that in mark_used. */
7292 if (cxx_dialect > cxx98
7293 && decl_linkage (decl) != lk_none
7294 && DECL_LANG_SPECIFIC (decl) == NULL
7295 && !DECL_EXTERN_C_P (decl)
7296 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7297 retrofit_lang_decl (decl);
7299 if (TREE_PUBLIC (decl))
7301 /* [basic.link]: A name with no linkage (notably, the name of a class
7302 or enumeration declared in a local scope) shall not be used to
7303 declare an entity with linkage.
7305 DR 757 relaxes this restriction for C++0x. */
7306 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7307 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7310 if (TYPE_ANONYMOUS_P (t))
7312 if (DECL_EXTERN_C_P (decl))
7313 /* Allow this; it's pretty common in C. */
7317 /* DRs 132, 319 and 389 seem to indicate types with
7318 no linkage can only be used to declare extern "C"
7319 entities. Since it's not always an error in the
7320 ISO C++ 90 Standard, we only issue a warning. */
7321 warning (0, "anonymous type with no linkage used to declare "
7322 "variable %q#D with linkage", decl);
7323 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7324 warning (0, "%q+#D does not refer to the unqualified "
7325 "type, so it is not used for linkage",
7330 warning (0, "type %qT with no linkage used to declare variable "
7331 "%q#D with linkage", t, decl);
7335 DECL_INTERFACE_KNOWN (decl) = 1;
7340 /* Create and return a canonical pointer to member function type, for
7341 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7344 build_ptrmemfunc_type (tree type)
7348 tree unqualified_variant = NULL_TREE;
7350 if (type == error_mark_node)
7353 /* If a canonical type already exists for this type, use it. We use
7354 this method instead of type_hash_canon, because it only does a
7355 simple equality check on the list of field members. */
7357 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7360 /* Make sure that we always have the unqualified pointer-to-member
7362 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7364 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7366 t = make_class_type (RECORD_TYPE);
7367 xref_basetypes (t, NULL_TREE);
7369 /* Let the front end know this is a pointer to member function... */
7370 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7371 /* ... and not really a class type. */
7372 SET_CLASS_TYPE_P (t, 0);
7374 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7377 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7379 DECL_CHAIN (field) = fields;
7382 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7384 /* Zap out the name so that the back end will give us the debugging
7385 information for this anonymous RECORD_TYPE. */
7386 TYPE_NAME (t) = NULL_TREE;
7388 /* If this is not the unqualified form of this pointer-to-member
7389 type, set the TYPE_MAIN_VARIANT for this type to be the
7390 unqualified type. Since they are actually RECORD_TYPEs that are
7391 not variants of each other, we must do this manually.
7392 As we just built a new type there is no need to do yet another copy. */
7393 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7395 int type_quals = cp_type_quals (type);
7396 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7397 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7398 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7399 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7400 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7401 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7402 TREE_TYPE (TYPE_BINFO (t)) = t;
7405 /* Cache this pointer-to-member type so that we can find it again
7407 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7409 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7410 SET_TYPE_STRUCTURAL_EQUALITY (t);
7411 else if (TYPE_CANONICAL (type) != type)
7412 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7417 /* Create and return a pointer to data member type. */
7420 build_ptrmem_type (tree class_type, tree member_type)
7422 if (TREE_CODE (member_type) == METHOD_TYPE)
7424 cp_cv_quals quals = type_memfn_quals (member_type);
7425 member_type = build_memfn_type (member_type, class_type, quals);
7426 return build_ptrmemfunc_type (build_pointer_type (member_type));
7430 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7431 return build_offset_type (class_type, member_type);
7435 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7436 Check to see that the definition is valid. Issue appropriate error
7437 messages. Return 1 if the definition is particularly bad, or 0
7441 check_static_variable_definition (tree decl, tree type)
7443 /* If DECL is declared constexpr, we'll do the appropriate checks
7444 in check_initializer. */
7445 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7447 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7449 if (literal_type_p (type))
7450 error ("%<constexpr%> needed for in-class initialization of static "
7451 "data member %q#D of non-integral type", decl);
7453 error ("in-class initialization of static data member %q#D of "
7454 "non-literal type", decl);
7458 /* Motion 10 at San Diego: If a static const integral data member is
7459 initialized with an integral constant expression, the initializer
7460 may appear either in the declaration (within the class), or in
7461 the definition, but not both. If it appears in the class, the
7462 member is a member constant. The file-scope definition is always
7464 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7466 error ("invalid in-class initialization of static data member "
7467 "of non-integral type %qT",
7471 else if (!CP_TYPE_CONST_P (type))
7472 error ("ISO C++ forbids in-class initialization of non-const "
7473 "static member %qD",
7475 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7476 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7477 "%qD of non-integral type %qT", decl, type);
7482 /* Given the SIZE (i.e., number of elements) in an array, compute an
7483 appropriate index type for the array. If non-NULL, NAME is the
7484 name of the thing being declared. */
7487 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7492 tree abi_1_itype = NULL_TREE;
7494 if (error_operand_p (size))
7495 return error_mark_node;
7497 type = TREE_TYPE (size);
7498 /* type_dependent_expression_p? */
7499 if (!dependent_type_p (type))
7501 mark_rvalue_use (size);
7503 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7504 && TREE_SIDE_EFFECTS (size))
7505 /* In C++98, we mark a non-constant array bound with a magic
7506 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7509 size = fold_non_dependent_expr (size);
7511 if (CLASS_TYPE_P (type)
7512 && CLASSTYPE_LITERAL_P (type))
7514 size = build_expr_type_conversion (WANT_INT, size, true);
7515 if (size == error_mark_node)
7516 return error_mark_node;
7517 type = TREE_TYPE (size);
7520 size = maybe_constant_value (size);
7523 if (error_operand_p (size))
7524 return error_mark_node;
7526 /* The array bound must be an integer type. */
7527 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7529 if (!(complain & tf_error))
7530 return error_mark_node;
7532 error ("size of array %qD has non-integral type %qT", name, type);
7534 error ("size of array has non-integral type %qT", type);
7535 size = integer_one_node;
7536 type = TREE_TYPE (size);
7540 /* A type is dependent if it is...an array type constructed from any
7541 dependent type or whose size is specified by a constant expression
7542 that is value-dependent. */
7543 /* We can only call value_dependent_expression_p on integral constant
7544 expressions; treat non-constant expressions as dependent, too. */
7545 if (processing_template_decl
7546 && (dependent_type_p (type)
7547 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7549 /* We cannot do any checking for a SIZE that isn't known to be
7550 constant. Just build the index type and mark that it requires
7551 structural equality checks. */
7552 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7553 size, integer_one_node));
7554 TYPE_DEPENDENT_P (itype) = 1;
7555 TYPE_DEPENDENT_P_VALID (itype) = 1;
7556 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7560 if (!abi_version_at_least (2) && processing_template_decl)
7561 /* For abi-1, we handled all instances in templates the same way,
7562 even when they were non-dependent. This affects the manglings
7563 produced. So, we do the normal checking for non-dependent
7564 sizes, but at the end we'll return the same type that abi-1
7565 would have, but with TYPE_CANONICAL set to the "right"
7566 value that the current ABI would provide. */
7567 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7568 osize, integer_one_node));
7570 /* Normally, the array-bound will be a constant. */
7571 if (TREE_CODE (size) == INTEGER_CST)
7573 /* Check to see if the array bound overflowed. Make that an
7574 error, no matter how generous we're being. */
7575 constant_expression_error (size);
7577 /* An array must have a positive number of elements. */
7578 if (INT_CST_LT (size, integer_zero_node))
7580 if (!(complain & tf_error))
7581 return error_mark_node;
7583 error ("size of array %qD is negative", name);
7585 error ("size of array is negative");
7586 size = integer_one_node;
7588 /* As an extension we allow zero-sized arrays. */
7589 else if (integer_zerop (size))
7591 if (!(complain & tf_error))
7592 /* We must fail if performing argument deduction (as
7593 indicated by the state of complain), so that
7594 another substitution can be found. */
7595 return error_mark_node;
7596 else if (in_system_header)
7597 /* Allow them in system headers because glibc uses them. */;
7599 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7601 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7604 else if (TREE_CONSTANT (size)
7605 /* We don't allow VLAs at non-function scopes, or during
7606 tentative template substitution. */
7607 || !at_function_scope_p () || !(complain & tf_error))
7609 if (!(complain & tf_error))
7610 return error_mark_node;
7611 /* `(int) &fn' is not a valid array bound. */
7613 error ("size of array %qD is not an integral constant-expression",
7616 error ("size of array is not an integral constant-expression");
7617 size = integer_one_node;
7619 else if (pedantic && warn_vla != 0)
7622 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7624 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7626 else if (warn_vla > 0)
7630 "variable length array %qD is used", name);
7633 "variable length array is used");
7636 if (processing_template_decl && !TREE_CONSTANT (size))
7637 /* A variable sized array. */
7638 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7641 HOST_WIDE_INT saved_processing_template_decl;
7643 /* Compute the index of the largest element in the array. It is
7644 one less than the number of elements in the array. We save
7645 and restore PROCESSING_TEMPLATE_DECL so that computations in
7646 cp_build_binary_op will be appropriately folded. */
7647 saved_processing_template_decl = processing_template_decl;
7648 processing_template_decl = 0;
7649 itype = cp_build_binary_op (input_location,
7651 cp_convert (ssizetype, size),
7652 cp_convert (ssizetype, integer_one_node),
7653 tf_warning_or_error);
7654 itype = fold (itype);
7655 processing_template_decl = saved_processing_template_decl;
7657 if (!TREE_CONSTANT (itype))
7658 /* A variable sized array. */
7659 itype = variable_size (itype);
7660 /* Make sure that there was no overflow when creating to a signed
7661 index type. (For example, on a 32-bit machine, an array with
7662 size 2^32 - 1 is too big.) */
7663 else if (TREE_CODE (itype) == INTEGER_CST
7664 && TREE_OVERFLOW (itype))
7666 if (!(complain & tf_error))
7667 return error_mark_node;
7668 error ("overflow in array dimension");
7669 TREE_OVERFLOW (itype) = 0;
7673 /* Create and return the appropriate index type. */
7676 tree t = build_index_type (itype);
7677 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7678 itype = abi_1_itype;
7681 itype = build_index_type (itype);
7683 /* If the index type were dependent, we would have returned early, so
7684 remember that it isn't. */
7685 TYPE_DEPENDENT_P (itype) = 0;
7686 TYPE_DEPENDENT_P_VALID (itype) = 1;
7690 /* Returns the scope (if any) in which the entity declared by
7691 DECLARATOR will be located. If the entity was declared with an
7692 unqualified name, NULL_TREE is returned. */
7695 get_scope_of_declarator (const cp_declarator *declarator)
7697 while (declarator && declarator->kind != cdk_id)
7698 declarator = declarator->declarator;
7700 /* If the declarator-id is a SCOPE_REF, the scope in which the
7701 declaration occurs is the first operand. */
7703 && declarator->u.id.qualifying_scope)
7704 return declarator->u.id.qualifying_scope;
7706 /* Otherwise, the declarator is not a qualified name; the entity will
7707 be declared in the current scope. */
7711 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7712 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7716 create_array_type_for_decl (tree name, tree type, tree size)
7718 tree itype = NULL_TREE;
7720 /* If things have already gone awry, bail now. */
7721 if (type == error_mark_node || size == error_mark_node)
7722 return error_mark_node;
7724 /* If there are some types which cannot be array elements,
7725 issue an error-message and return. */
7726 switch (TREE_CODE (type))
7730 error ("declaration of %qD as array of void", name);
7732 error ("creating array of void");
7733 return error_mark_node;
7737 error ("declaration of %qD as array of functions", name);
7739 error ("creating array of functions");
7740 return error_mark_node;
7742 case REFERENCE_TYPE:
7744 error ("declaration of %qD as array of references", name);
7746 error ("creating array of references");
7747 return error_mark_node;
7751 error ("declaration of %qD as array of function members", name);
7753 error ("creating array of function members");
7754 return error_mark_node;
7762 The constant expressions that specify the bounds of the arrays
7763 can be omitted only for the first member of the sequence. */
7764 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7767 error ("declaration of %qD as multidimensional array must "
7768 "have bounds for all dimensions except the first",
7771 error ("multidimensional array must have bounds for all "
7772 "dimensions except the first");
7774 return error_mark_node;
7777 /* Figure out the index type for the array. */
7779 itype = compute_array_index_type (name, size, tf_warning_or_error);
7782 T is called the array element type; this type shall not be [...] an
7783 abstract class type. */
7784 abstract_virtuals_error (name, type);
7786 return build_cplus_array_type (type, itype);
7789 /* Check that it's OK to declare a function with the indicated TYPE.
7790 SFK indicates the kind of special function (if any) that this
7791 function is. OPTYPE is the type given in a conversion operator
7792 declaration, or the class type for a constructor/destructor.
7793 Returns the actual return type of the function; that
7794 may be different than TYPE if an error occurs, or for certain
7795 special functions. */
7798 check_special_function_return_type (special_function_kind sfk,
7804 case sfk_constructor:
7806 error ("return type specification for constructor invalid");
7808 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7809 type = build_pointer_type (optype);
7811 type = void_type_node;
7814 case sfk_destructor:
7816 error ("return type specification for destructor invalid");
7817 /* We can't use the proper return type here because we run into
7818 problems with ambiguous bases and covariant returns.
7819 Java classes are left unchanged because (void *) isn't a valid
7820 Java type, and we don't want to change the Java ABI. */
7821 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7822 type = build_pointer_type (void_type_node);
7824 type = void_type_node;
7827 case sfk_conversion:
7829 error ("return type specified for %<operator %T%>", optype);
7840 /* A variable or data member (whose unqualified name is IDENTIFIER)
7841 has been declared with the indicated TYPE. If the TYPE is not
7842 acceptable, issue an error message and return a type to use for
7843 error-recovery purposes. */
7846 check_var_type (tree identifier, tree type)
7848 if (VOID_TYPE_P (type))
7851 error ("unnamed variable or field declared void");
7852 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7854 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7855 error ("variable or field %qE declared void", identifier);
7858 error ("variable or field declared void");
7859 type = error_mark_node;
7865 /* Given declspecs and a declarator (abstract or otherwise), determine
7866 the name and type of the object declared and construct a DECL node
7869 DECLSPECS points to the representation of declaration-specifier
7870 sequence that precedes declarator.
7872 DECL_CONTEXT says which syntactic context this declaration is in:
7873 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7874 FUNCDEF for a function definition. Like NORMAL but a few different
7875 error messages in each case. Return value may be zero meaning
7876 this definition is too screwy to try to parse.
7877 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7878 handle member functions (which have FIELD context).
7879 Return value may be zero meaning this definition is too screwy to
7881 PARM for a parameter declaration (either within a function prototype
7882 or before a function body). Make a PARM_DECL, or return void_type_node.
7883 TPARM for a template parameter declaration.
7884 CATCHPARM for a parameter declaration before a catch clause.
7885 TYPENAME if for a typename (in a cast or sizeof).
7886 Don't make a DECL node; just return the ..._TYPE node.
7887 FIELD for a struct or union field; make a FIELD_DECL.
7888 BITFIELD for a field with specified width.
7890 INITIALIZED is as for start_decl.
7892 ATTRLIST is a pointer to the list of attributes, which may be NULL
7893 if there are none; *ATTRLIST may be modified if attributes from inside
7894 the declarator should be applied to the declaration.
7896 When this function is called, scoping variables (such as
7897 CURRENT_CLASS_TYPE) should reflect the scope in which the
7898 declaration occurs, not the scope in which the new declaration will
7899 be placed. For example, on:
7903 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7906 Returns a DECL (if a declarator is present), a TYPE (if there is no
7907 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7911 grokdeclarator (const cp_declarator *declarator,
7912 const cp_decl_specifier_seq *declspecs,
7913 enum decl_context decl_context,
7917 tree type = NULL_TREE;
7919 int explicit_int128 = 0;
7920 int virtualp, explicitp, friendp, inlinep, staticp;
7921 int explicit_int = 0;
7922 int explicit_char = 0;
7923 int defaulted_int = 0;
7924 tree dependent_name = NULL_TREE;
7926 tree typedef_decl = NULL_TREE;
7927 const char *name = NULL;
7928 tree typedef_type = NULL_TREE;
7929 /* True if this declarator is a function definition. */
7930 bool funcdef_flag = false;
7931 cp_declarator_kind innermost_code = cdk_error;
7934 /* See the code below that used this. */
7935 tree decl_attr = NULL_TREE;
7938 /* Keep track of what sort of function is being processed
7939 so that we can warn about default return values, or explicit
7940 return values which do not match prescribed defaults. */
7941 special_function_kind sfk = sfk_none;
7943 tree dname = NULL_TREE;
7944 tree ctor_return_type = NULL_TREE;
7945 enum overload_flags flags = NO_SPECIAL;
7946 /* cv-qualifiers that apply to the declarator, for a declaration of
7947 a member function. */
7948 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7949 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7951 tree raises = NULL_TREE;
7952 int template_count = 0;
7953 tree returned_attrs = NULL_TREE;
7954 tree parms = NULL_TREE;
7955 const cp_declarator *id_declarator;
7956 /* The unqualified name of the declarator; either an
7957 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7958 tree unqualified_id;
7959 /* The class type, if any, in which this entity is located,
7960 or NULL_TREE if none. Note that this value may be different from
7961 the current class type; for example if an attempt is made to declare
7962 "A::f" inside "B", this value will be "A". */
7963 tree ctype = current_class_type;
7964 /* The NAMESPACE_DECL for the namespace in which this entity is
7965 located. If an unqualified name is used to declare the entity,
7966 this value will be NULL_TREE, even if the entity is located at
7968 tree in_namespace = NULL_TREE;
7969 cp_storage_class storage_class;
7970 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7971 bool type_was_error_mark_node = false;
7972 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7973 bool template_type_arg = false;
7974 bool template_parm_flag = false;
7975 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7978 signed_p = declspecs->specs[(int)ds_signed];
7979 unsigned_p = declspecs->specs[(int)ds_unsigned];
7980 short_p = declspecs->specs[(int)ds_short];
7981 long_p = declspecs->specs[(int)ds_long];
7982 longlong = declspecs->specs[(int)ds_long] >= 2;
7983 explicit_int128 = declspecs->explicit_int128_p;
7984 thread_p = declspecs->specs[(int)ds_thread];
7986 if (decl_context == FUNCDEF)
7987 funcdef_flag = true, decl_context = NORMAL;
7988 else if (decl_context == MEMFUNCDEF)
7989 funcdef_flag = true, decl_context = FIELD;
7990 else if (decl_context == BITFIELD)
7991 bitfield = 1, decl_context = FIELD;
7992 else if (decl_context == TEMPLATE_TYPE_ARG)
7993 template_type_arg = true, decl_context = TYPENAME;
7994 else if (decl_context == TPARM)
7995 template_parm_flag = true, decl_context = PARM;
7997 if (initialized > 1)
7998 funcdef_flag = true;
8000 /* Look inside a declarator for the name being declared
8001 and get it as a string, for an error message. */
8002 for (id_declarator = declarator;
8004 id_declarator = id_declarator->declarator)
8006 if (id_declarator->kind != cdk_id)
8007 innermost_code = id_declarator->kind;
8009 switch (id_declarator->kind)
8012 if (id_declarator->declarator
8013 && id_declarator->declarator->kind == cdk_id)
8015 sfk = id_declarator->declarator->u.id.sfk;
8016 if (sfk == sfk_destructor)
8023 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8024 tree decl = id_declarator->u.id.unqualified_name;
8027 if (qualifying_scope)
8029 if (at_function_scope_p ())
8033 A declarator-id shall not be qualified except
8036 None of the cases are permitted in block
8038 if (qualifying_scope == global_namespace)
8039 error ("invalid use of qualified-name %<::%D%>",
8041 else if (TYPE_P (qualifying_scope))
8042 error ("invalid use of qualified-name %<%T::%D%>",
8043 qualifying_scope, decl);
8045 error ("invalid use of qualified-name %<%D::%D%>",
8046 qualifying_scope, decl);
8047 return error_mark_node;
8049 else if (TYPE_P (qualifying_scope))
8051 ctype = qualifying_scope;
8052 if (innermost_code != cdk_function
8053 && current_class_type
8054 && !UNIQUELY_DERIVED_FROM_P (ctype,
8055 current_class_type))
8057 error ("type %qT is not derived from type %qT",
8058 ctype, current_class_type);
8059 return error_mark_node;
8062 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8063 in_namespace = qualifying_scope;
8065 switch (TREE_CODE (decl))
8071 if (innermost_code != cdk_function)
8073 error ("declaration of %qD as non-function", decl);
8074 return error_mark_node;
8076 else if (!qualifying_scope
8077 && !(current_class_type && at_class_scope_p ()))
8079 error ("declaration of %qD as non-member", decl);
8080 return error_mark_node;
8083 type = TREE_OPERAND (decl, 0);
8085 type = constructor_name (type);
8086 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8091 case TEMPLATE_ID_EXPR:
8093 tree fns = TREE_OPERAND (decl, 0);
8096 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8098 gcc_assert (is_overloaded_fn (dname));
8099 dname = DECL_NAME (get_first_fn (dname));
8104 case IDENTIFIER_NODE:
8105 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8108 if (C_IS_RESERVED_WORD (dname))
8110 error ("declarator-id missing; using reserved word %qD",
8112 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8114 else if (!IDENTIFIER_TYPENAME_P (dname))
8115 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8118 gcc_assert (flags == NO_SPECIAL);
8119 flags = TYPENAME_FLAG;
8120 ctor_return_type = TREE_TYPE (dname);
8121 sfk = sfk_conversion;
8122 if (is_typename_at_global_scope (dname))
8123 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8125 name = "<invalid operator>";
8142 return error_mark_node;
8147 if (id_declarator->kind == cdk_id)
8153 The declarator in a function-definition shall have the form
8154 D1 ( parameter-declaration-clause) ... */
8155 if (funcdef_flag && innermost_code != cdk_function)
8157 error ("function definition does not declare parameters");
8158 return error_mark_node;
8161 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8162 && innermost_code != cdk_function
8163 && ! (ctype && !declspecs->any_specifiers_p))
8165 error ("declaration of %qD as non-function", dname);
8166 return error_mark_node;
8169 /* Anything declared one level down from the top level
8170 must be one of the parameters of a function
8171 (because the body is at least two levels down). */
8173 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8174 by not allowing C++ class definitions to specify their parameters
8175 with xdecls (must be spec.d in the parmlist).
8177 Since we now wait to push a class scope until we are sure that
8178 we are in a legitimate method context, we must set oldcname
8179 explicitly (since current_class_name is not yet alive).
8181 We also want to avoid calling this a PARM if it is in a namespace. */
8183 if (decl_context == NORMAL && !toplevel_bindings_p ())
8185 struct cp_binding_level *b = current_binding_level;
8186 current_binding_level = b->level_chain;
8187 if (current_binding_level != 0 && toplevel_bindings_p ())
8188 decl_context = PARM;
8189 current_binding_level = b;
8193 name = decl_context == PARM ? "parameter" : "type name";
8195 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8197 error ("%<constexpr%> cannot appear in a typedef declaration");
8198 return error_mark_node;
8201 /* If there were multiple types specified in the decl-specifier-seq,
8202 issue an error message. */
8203 if (declspecs->multiple_types_p)
8205 error ("two or more data types in declaration of %qs", name);
8206 return error_mark_node;
8209 if (declspecs->conflicting_specifiers_p)
8211 error ("conflicting specifiers in declaration of %qs", name);
8212 return error_mark_node;
8215 /* Extract the basic type from the decl-specifier-seq. */
8216 type = declspecs->type;
8217 if (type == error_mark_node)
8220 type_was_error_mark_node = true;
8222 /* If the entire declaration is itself tagged as deprecated then
8223 suppress reports of deprecated items. */
8224 if (type && TREE_DEPRECATED (type)
8225 && deprecated_state != DEPRECATED_SUPPRESS)
8226 warn_deprecated_use (type, NULL_TREE);
8227 if (type && TREE_CODE (type) == TYPE_DECL)
8229 typedef_decl = type;
8230 type = TREE_TYPE (typedef_decl);
8231 if (TREE_DEPRECATED (type)
8232 && DECL_ARTIFICIAL (typedef_decl)
8233 && deprecated_state != DEPRECATED_SUPPRESS)
8234 warn_deprecated_use (type, NULL_TREE);
8236 /* No type at all: default to `int', and set DEFAULTED_INT
8237 because it was not a user-defined typedef. */
8238 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8240 /* These imply 'int'. */
8241 type = integer_type_node;
8245 explicit_int = declspecs->explicit_int_p;
8246 explicit_char = declspecs->explicit_char_p;
8249 /* See the code below that used this. */
8251 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8253 typedef_type = type;
8256 if (sfk != sfk_conversion)
8257 ctor_return_type = ctype;
8259 if (sfk != sfk_none)
8260 type = check_special_function_return_type (sfk, type,
8262 else if (type == NULL_TREE)
8268 /* We handle `main' specially here, because 'main () { }' is so
8269 common. With no options, it is allowed. With -Wreturn-type,
8270 it is a warning. It is only an error with -pedantic-errors. */
8271 is_main = (funcdef_flag
8272 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8273 && MAIN_NAME_P (dname)
8274 && ctype == NULL_TREE
8275 && in_namespace == NULL_TREE
8276 && current_namespace == global_namespace);
8278 if (type_was_error_mark_node)
8279 /* We've already issued an error, don't complain more. */;
8280 else if (in_system_header || flag_ms_extensions)
8281 /* Allow it, sigh. */;
8283 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8285 pedwarn (input_location, OPT_pedantic,
8286 "ISO C++ forbids declaration of %qs with no type", name);
8288 warning (OPT_Wreturn_type,
8289 "ISO C++ forbids declaration of %qs with no type", name);
8291 type = integer_type_node;
8296 /* Now process the modifiers that were specified
8297 and check for invalid combinations. */
8299 /* Long double is a special combination. */
8300 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8303 type = cp_build_qualified_type (long_double_type_node,
8304 cp_type_quals (type));
8307 /* Check all other uses of type modifiers. */
8309 if (unsigned_p || signed_p || long_p || short_p)
8313 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8314 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8315 else if (signed_p && unsigned_p)
8316 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8317 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8318 error ("%<long long%> invalid for %qs", name);
8319 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8320 error ("%<__int128%> invalid for %qs", name);
8321 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8322 error ("%<long%> invalid for %qs", name);
8323 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8324 error ("%<short%> invalid for %qs", name);
8325 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8326 error ("%<long%> or %<short%> invalid for %qs", name);
8327 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8328 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8329 else if ((long_p || short_p) && explicit_char)
8330 error ("%<long%> or %<short%> specified with char for %qs", name);
8331 else if (long_p && short_p)
8332 error ("%<long%> and %<short%> specified together for %qs", name);
8333 else if (type == char16_type_node || type == char32_type_node)
8335 if (signed_p || unsigned_p)
8336 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8337 else if (short_p || long_p)
8338 error ("%<short%> or %<long%> invalid for %qs", name);
8343 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8345 pedwarn (input_location, OPT_pedantic,
8346 "long, short, signed or unsigned used invalidly for %qs",
8348 if (flag_pedantic_errors)
8351 if (explicit_int128)
8353 if (int128_integer_type_node == NULL_TREE)
8355 error ("%<__int128%> is not supported by this target");
8360 pedwarn (input_location, OPT_pedantic,
8361 "ISO C++ does not support %<__int128%> for %qs",
8363 if (flag_pedantic_errors)
8369 /* Discard the type modifiers if they are invalid. */
8377 explicit_int128 = false;
8381 /* Decide whether an integer type is signed or not.
8382 Optionally treat bitfields as signed by default. */
8386 It is implementation-defined whether a plain (neither
8387 explicitly signed or unsigned) char, short, int, or long
8388 bit-field is signed or unsigned.
8390 Naturally, we extend this to long long as well. Note that
8391 this does not include wchar_t. */
8392 || (bitfield && !flag_signed_bitfields
8394 /* A typedef for plain `int' without `signed' can be
8395 controlled just like plain `int', but a typedef for
8396 `signed int' cannot be so controlled. */
8398 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8399 && TREE_CODE (type) == INTEGER_TYPE
8400 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8402 if (explicit_int128)
8403 type = int128_unsigned_type_node;
8405 type = long_long_unsigned_type_node;
8407 type = long_unsigned_type_node;
8409 type = short_unsigned_type_node;
8410 else if (type == char_type_node)
8411 type = unsigned_char_type_node;
8412 else if (typedef_decl)
8413 type = unsigned_type_for (type);
8415 type = unsigned_type_node;
8417 else if (signed_p && type == char_type_node)
8418 type = signed_char_type_node;
8419 else if (explicit_int128)
8420 type = int128_integer_type_node;
8422 type = long_long_integer_type_node;
8424 type = long_integer_type_node;
8426 type = short_integer_type_node;
8428 if (declspecs->specs[(int)ds_complex])
8430 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8431 error ("complex invalid for %qs", name);
8432 /* If we just have "complex", it is equivalent to
8433 "complex double", but if any modifiers at all are specified it is
8434 the complex form of TYPE. E.g, "complex short" is
8435 "complex short int". */
8436 else if (defaulted_int && ! longlong && ! explicit_int128
8437 && ! (long_p || short_p || signed_p || unsigned_p))
8438 type = complex_double_type_node;
8439 else if (type == integer_type_node)
8440 type = complex_integer_type_node;
8441 else if (type == float_type_node)
8442 type = complex_float_type_node;
8443 else if (type == double_type_node)
8444 type = complex_double_type_node;
8445 else if (type == long_double_type_node)
8446 type = complex_long_double_type_node;
8448 type = build_complex_type (type);
8451 type_quals = TYPE_UNQUALIFIED;
8452 if (declspecs->specs[(int)ds_const])
8453 type_quals |= TYPE_QUAL_CONST;
8454 if (declspecs->specs[(int)ds_volatile])
8455 type_quals |= TYPE_QUAL_VOLATILE;
8456 if (declspecs->specs[(int)ds_restrict])
8457 type_quals |= TYPE_QUAL_RESTRICT;
8458 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8459 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8462 type_quals |= cp_type_quals (type);
8463 type = cp_build_qualified_type_real
8464 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8465 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8466 /* We might have ignored or rejected some of the qualifiers. */
8467 type_quals = cp_type_quals (type);
8470 inlinep = !! declspecs->specs[(int)ds_inline];
8471 virtualp = !! declspecs->specs[(int)ds_virtual];
8472 explicitp = !! declspecs->specs[(int)ds_explicit];
8474 storage_class = declspecs->storage_class;
8475 if (storage_class == sc_static)
8476 staticp = 1 + (decl_context == FIELD);
8478 if (virtualp && staticp == 2)
8480 error ("member %qD cannot be declared both virtual and static", dname);
8481 storage_class = sc_none;
8484 friendp = !! declspecs->specs[(int)ds_friend];
8486 if (dependent_name && !friendp)
8488 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8489 return error_mark_node;
8492 /* Issue errors about use of storage classes for parameters. */
8493 if (decl_context == PARM)
8495 if (declspecs->specs[(int)ds_typedef])
8497 error ("typedef declaration invalid in parameter declaration");
8498 return error_mark_node;
8500 else if (template_parm_flag && storage_class != sc_none)
8502 error ("storage class specified for template parameter %qs", name);
8503 return error_mark_node;
8505 else if (storage_class == sc_static
8506 || storage_class == sc_extern
8508 error ("storage class specifiers invalid in parameter declarations");
8510 if (type_uses_auto (type))
8512 error ("parameter declared %<auto%>");
8513 type = error_mark_node;
8516 /* Function parameters cannot be constexpr. If we saw one, moan
8517 and pretend it wasn't there. */
8520 error ("a parameter cannot be declared %<constexpr%>");
8525 /* Give error if `virtual' is used outside of class declaration. */
8527 && (current_class_name == NULL_TREE || decl_context != FIELD))
8529 error ("%<virtual%> outside class declaration");
8533 /* Static anonymous unions are dealt with here. */
8534 if (staticp && decl_context == TYPENAME
8536 && ANON_AGGR_TYPE_P (declspecs->type))
8537 decl_context = FIELD;
8539 /* Warn about storage classes that are invalid for certain
8540 kinds of declarations (parameters, typenames, etc.). */
8543 && storage_class != sc_extern
8544 && storage_class != sc_static)
8545 || declspecs->specs[(int)ds_typedef]))
8547 error ("multiple storage classes in declaration of %qs", name);
8550 if (decl_context != NORMAL
8551 && ((storage_class != sc_none
8552 && storage_class != sc_mutable)
8555 if ((decl_context == PARM || decl_context == CATCHPARM)
8556 && (storage_class == sc_register
8557 || storage_class == sc_auto))
8559 else if (declspecs->specs[(int)ds_typedef])
8561 else if (decl_context == FIELD
8562 /* C++ allows static class elements. */
8563 && storage_class == sc_static)
8564 /* C++ also allows inlines and signed and unsigned elements,
8565 but in those cases we don't come in here. */
8569 if (decl_context == FIELD)
8570 error ("storage class specified for %qs", name);
8573 if (decl_context == PARM || decl_context == CATCHPARM)
8574 error ("storage class specified for parameter %qs", name);
8576 error ("storage class specified for typename");
8578 if (storage_class == sc_register
8579 || storage_class == sc_auto
8580 || storage_class == sc_extern
8582 storage_class = sc_none;
8585 else if (storage_class == sc_extern && funcdef_flag
8586 && ! toplevel_bindings_p ())
8587 error ("nested function %qs declared %<extern%>", name);
8588 else if (toplevel_bindings_p ())
8590 if (storage_class == sc_auto)
8591 error ("top-level declaration of %qs specifies %<auto%>", name);
8594 && storage_class != sc_extern
8595 && storage_class != sc_static)
8597 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8602 if (storage_class && friendp)
8604 error ("storage class specifiers invalid in friend function declarations");
8605 storage_class = sc_none;
8610 unqualified_id = NULL_TREE;
8613 unqualified_id = id_declarator->u.id.unqualified_name;
8614 switch (TREE_CODE (unqualified_id))
8617 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8618 if (TYPE_P (unqualified_id))
8619 unqualified_id = constructor_name (unqualified_id);
8622 case IDENTIFIER_NODE:
8623 case TEMPLATE_ID_EXPR:
8631 /* Determine the type of the entity declared by recurring on the
8633 for (; declarator; declarator = declarator->declarator)
8635 const cp_declarator *inner_declarator;
8638 if (type == error_mark_node)
8639 return error_mark_node;
8641 attrs = declarator->attributes;
8647 if (declarator == NULL || declarator->kind == cdk_id)
8648 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8649 if (declarator->kind == cdk_function)
8650 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8651 if (declarator->kind == cdk_array)
8652 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8653 returned_attrs = decl_attributes (&type,
8654 chainon (returned_attrs, attrs),
8658 if (declarator->kind == cdk_id)
8661 inner_declarator = declarator->declarator;
8663 switch (declarator->kind)
8666 type = create_array_type_for_decl (dname, type,
8667 declarator->u.array.bounds);
8675 /* Declaring a function type.
8676 Make sure we have a valid type for the function to return. */
8678 if (type_quals != TYPE_UNQUALIFIED)
8680 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8681 warning (OPT_Wignored_qualifiers,
8682 "type qualifiers ignored on function return type");
8683 /* We now know that the TYPE_QUALS don't apply to the
8684 decl, but to its return type. */
8685 type_quals = TYPE_UNQUALIFIED;
8687 errmsg = targetm.invalid_return_type (type);
8691 type = integer_type_node;
8694 /* Error about some types functions can't return. */
8696 if (TREE_CODE (type) == FUNCTION_TYPE)
8698 error ("%qs declared as function returning a function", name);
8699 return error_mark_node;
8701 if (TREE_CODE (type) == ARRAY_TYPE)
8703 error ("%qs declared as function returning an array", name);
8704 return error_mark_node;
8707 /* Pick up type qualifiers which should be applied to `this'. */
8708 memfn_quals = declarator->u.function.qualifiers;
8710 /* Pick up the exception specifications. */
8711 raises = declarator->u.function.exception_specification;
8713 /* Say it's a definition only for the CALL_EXPR
8714 closest to the identifier. */
8715 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8717 /* Handle a late-specified return type. */
8720 if (type_uses_auto (type))
8722 if (!declarator->u.function.late_return_type)
8724 error ("%qs function uses %<auto%> type specifier without"
8725 " late return type", name);
8726 return error_mark_node;
8728 else if (!is_auto (type))
8730 error ("%qs function with late return type has"
8731 " %qT as its type rather than plain %<auto%>",
8733 return error_mark_node;
8736 else if (declarator->u.function.late_return_type)
8738 error ("%qs function with late return type not declared"
8739 " with %<auto%> type specifier", name);
8740 return error_mark_node;
8743 type = splice_late_return_type
8744 (type, declarator->u.function.late_return_type);
8745 if (type == error_mark_node)
8746 return error_mark_node;
8748 if (ctype == NULL_TREE
8749 && decl_context == FIELD
8751 && (friendp == 0 || dname == current_class_name))
8752 ctype = current_class_type;
8754 if (ctype && (sfk == sfk_constructor
8755 || sfk == sfk_destructor))
8757 /* We are within a class's scope. If our declarator name
8758 is the same as the class name, and we are defining
8759 a function, then it is a constructor/destructor, and
8760 therefore returns a void type. */
8762 /* ISO C++ 12.4/2. A destructor may not be declared
8763 const or volatile. A destructor may not be
8766 ISO C++ 12.1. A constructor may not be declared
8767 const or volatile. A constructor may not be
8768 virtual. A constructor may not be static. */
8770 error ((flags == DTOR_FLAG)
8771 ? "destructor cannot be static member function"
8772 : "constructor cannot be static member function");
8775 error ((flags == DTOR_FLAG)
8776 ? "destructors may not be cv-qualified"
8777 : "constructors may not be cv-qualified");
8778 memfn_quals = TYPE_UNQUALIFIED;
8781 if (decl_context == FIELD
8782 && !member_function_or_else (ctype,
8785 return error_mark_node;
8787 if (flags != DTOR_FLAG)
8789 /* It's a constructor. */
8794 permerror (input_location, "constructors cannot be declared virtual");
8797 if (decl_context == FIELD
8798 && sfk != sfk_constructor)
8799 return error_mark_node;
8801 if (decl_context == FIELD)
8807 error ("can%'t initialize friend function %qs", name);
8810 /* Cannot be both friend and virtual. */
8811 error ("virtual functions cannot be friends");
8814 if (decl_context == NORMAL)
8815 error ("friend declaration not in class definition");
8816 if (current_function_decl && funcdef_flag)
8817 error ("can%'t define friend function %qs in a local "
8821 else if (ctype && sfk == sfk_conversion)
8825 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8830 arg_types = grokparms (declarator->u.function.parameters,
8833 if (inner_declarator
8834 && inner_declarator->kind == cdk_id
8835 && inner_declarator->u.id.sfk == sfk_destructor
8836 && arg_types != void_list_node)
8838 error ("destructors may not have parameters");
8839 arg_types = void_list_node;
8843 type = build_function_type (type, arg_types);
8850 /* Filter out pointers-to-references and references-to-references.
8851 We can get these if a TYPE_DECL is used. */
8853 if (TREE_CODE (type) == REFERENCE_TYPE)
8855 if (declarator->kind != cdk_reference)
8857 error ("cannot declare pointer to %q#T", type);
8858 type = TREE_TYPE (type);
8861 /* In C++0x, we allow reference to reference declarations
8862 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8863 and template type arguments [14.3.1/4 temp.arg.type]. The
8864 check for direct reference to reference declarations, which
8865 are still forbidden, occurs below. Reasoning behind the change
8866 can be found in DR106, DR540, and the rvalue reference
8868 else if (cxx_dialect == cxx98)
8870 error ("cannot declare reference to %q#T", type);
8871 type = TREE_TYPE (type);
8874 else if (VOID_TYPE_P (type))
8876 if (declarator->kind == cdk_reference)
8877 error ("cannot declare reference to %q#T", type);
8878 else if (declarator->kind == cdk_ptrmem)
8879 error ("cannot declare pointer to %q#T member", type);
8882 /* We now know that the TYPE_QUALS don't apply to the decl,
8883 but to the target of the pointer. */
8884 type_quals = TYPE_UNQUALIFIED;
8886 if (declarator->kind == cdk_ptrmem
8887 && (TREE_CODE (type) == FUNCTION_TYPE
8888 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8890 memfn_quals |= type_memfn_quals (type);
8891 type = build_memfn_type (type,
8892 declarator->u.pointer.class_type,
8894 if (type == error_mark_node)
8895 return error_mark_node;
8896 memfn_quals = TYPE_UNQUALIFIED;
8899 if (TREE_CODE (type) == FUNCTION_TYPE
8900 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8901 error (declarator->kind == cdk_reference
8902 ? G_("cannot declare reference to qualified function type %qT")
8903 : G_("cannot declare pointer to qualified function type %qT"),
8906 /* When the pointed-to type involves components of variable size,
8907 care must be taken to ensure that the size evaluation code is
8908 emitted early enough to dominate all the possible later uses
8909 and late enough for the variables on which it depends to have
8912 This is expected to happen automatically when the pointed-to
8913 type has a name/declaration of it's own, but special attention
8914 is required if the type is anonymous.
8916 We handle the NORMAL and FIELD contexts here by inserting a
8917 dummy statement that just evaluates the size at a safe point
8918 and ensures it is not deferred until e.g. within a deeper
8919 conditional context (c++/43555).
8921 We expect nothing to be needed here for PARM or TYPENAME.
8922 Evaluating the size at this point for TYPENAME would
8923 actually be incorrect, as we might be in the middle of an
8924 expression with side effects on the pointed-to type size
8925 "arguments" prior to the pointer declaration point and the
8926 size evaluation could end up prior to the side effects. */
8928 if (!TYPE_NAME (type)
8929 && (decl_context == NORMAL || decl_context == FIELD)
8930 && at_function_scope_p ()
8931 && variably_modified_type_p (type, NULL_TREE))
8932 finish_expr_stmt (TYPE_SIZE (type));
8934 if (declarator->kind == cdk_reference)
8936 /* In C++0x, the type we are creating a reference to might be
8937 a typedef which is itself a reference type. In that case,
8938 we follow the reference collapsing rules in
8939 [7.1.3/8 dcl.typedef] to create the final reference type:
8941 "If a typedef TD names a type that is a reference to a type
8942 T, an attempt to create the type 'lvalue reference to cv TD'
8943 creates the type 'lvalue reference to T,' while an attempt
8944 to create the type "rvalue reference to cv TD' creates the
8947 if (!VOID_TYPE_P (type))
8948 type = cp_build_reference_type
8949 ((TREE_CODE (type) == REFERENCE_TYPE
8950 ? TREE_TYPE (type) : type),
8951 (declarator->u.reference.rvalue_ref
8952 && (TREE_CODE(type) != REFERENCE_TYPE
8953 || TYPE_REF_IS_RVALUE (type))));
8955 /* In C++0x, we need this check for direct reference to
8956 reference declarations, which are forbidden by
8957 [8.3.2/5 dcl.ref]. Reference to reference declarations
8958 are only allowed indirectly through typedefs and template
8959 type arguments. Example:
8961 void foo(int & &); // invalid ref-to-ref decl
8963 typedef int & int_ref;
8964 void foo(int_ref &); // valid ref-to-ref decl
8966 if (inner_declarator && inner_declarator->kind == cdk_reference)
8967 error ("cannot declare reference to %q#T, which is not "
8968 "a typedef or a template type argument", type);
8970 else if (TREE_CODE (type) == METHOD_TYPE)
8971 type = build_ptrmemfunc_type (build_pointer_type (type));
8972 else if (declarator->kind == cdk_ptrmem)
8974 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8976 if (declarator->u.pointer.class_type == error_mark_node)
8977 /* We will already have complained. */
8978 type = error_mark_node;
8980 type = build_ptrmem_type (declarator->u.pointer.class_type,
8984 type = build_pointer_type (type);
8986 /* Process a list of type modifier keywords (such as
8987 const or volatile) that were given inside the `*' or `&'. */
8989 if (declarator->u.pointer.qualifiers)
8992 = cp_build_qualified_type (type,
8993 declarator->u.pointer.qualifiers);
8994 type_quals = cp_type_quals (type);
9007 /* A `constexpr' specifier used in an object declaration declares
9008 the object as `const'. */
9009 if (constexpr_p && innermost_code != cdk_function)
9011 if (type_quals & TYPE_QUAL_CONST)
9012 error ("both %<const%> and %<constexpr%> cannot be used here");
9013 if (type_quals & TYPE_QUAL_VOLATILE)
9014 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9015 type_quals |= TYPE_QUAL_CONST;
9016 type = cp_build_qualified_type (type, type_quals);
9019 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9020 && TREE_CODE (type) != FUNCTION_TYPE
9021 && TREE_CODE (type) != METHOD_TYPE)
9023 error ("template-id %qD used as a declarator",
9025 unqualified_id = dname;
9028 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9029 qualified with a class-name, turn it into a METHOD_TYPE, unless
9030 we know that the function is static. We take advantage of this
9031 opportunity to do other processing that pertains to entities
9032 explicitly declared to be class members. Note that if DECLARATOR
9033 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9034 would not have exited the loop above. */
9036 && declarator->u.id.qualifying_scope
9037 && TYPE_P (declarator->u.id.qualifying_scope))
9041 ctype = declarator->u.id.qualifying_scope;
9042 ctype = TYPE_MAIN_VARIANT (ctype);
9044 while (t != NULL_TREE && CLASS_TYPE_P (t))
9046 /* You're supposed to have one `template <...>' for every
9047 template class, but you don't need one for a full
9048 specialization. For example:
9050 template <class T> struct S{};
9051 template <> struct S<int> { void f(); };
9052 void S<int>::f () {}
9054 is correct; there shouldn't be a `template <>' for the
9055 definition of `S<int>::f'. */
9056 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9057 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9058 /* T is an explicit (not partial) specialization. All
9059 containing classes must therefore also be explicitly
9062 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9063 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9064 template_count += 1;
9066 t = TYPE_MAIN_DECL (t);
9067 t = DECL_CONTEXT (t);
9070 if (ctype == current_class_type)
9074 permerror (input_location, "member functions are implicitly friends of their class");
9078 permerror (declarator->id_loc,
9079 "extra qualification %<%T::%> on member %qs",
9082 else if (/* If the qualifying type is already complete, then we
9083 can skip the following checks. */
9084 !COMPLETE_TYPE_P (ctype)
9085 && (/* If the function is being defined, then
9086 qualifying type must certainly be complete. */
9088 /* A friend declaration of "T::f" is OK, even if
9089 "T" is a template parameter. But, if this
9090 function is not a friend, the qualifying type
9092 || (!friendp && !CLASS_TYPE_P (ctype))
9093 /* For a declaration, the type need not be
9094 complete, if either it is dependent (since there
9095 is no meaningful definition of complete in that
9096 case) or the qualifying class is currently being
9098 || !(dependent_type_p (ctype)
9099 || currently_open_class (ctype)))
9100 /* Check that the qualifying type is complete. */
9101 && !complete_type_or_else (ctype, NULL_TREE))
9102 return error_mark_node;
9103 else if (TREE_CODE (type) == FUNCTION_TYPE)
9105 if (current_class_type
9106 && (!friendp || funcdef_flag))
9109 ? "cannot define member function %<%T::%s%> within %<%T%>"
9110 : "cannot declare member function %<%T::%s%> within %<%T%>",
9111 ctype, name, current_class_type);
9112 return error_mark_node;
9115 else if (declspecs->specs[(int)ds_typedef]
9116 && current_class_type)
9118 error ("cannot declare member %<%T::%s%> within %qT",
9119 ctype, name, current_class_type);
9120 return error_mark_node;
9124 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9125 ctype = current_class_type;
9127 /* A constexpr non-static member function is implicitly const. */
9128 if (constexpr_p && ctype && staticp == 0
9129 && TREE_CODE (type) == FUNCTION_TYPE
9130 && sfk != sfk_constructor && sfk != sfk_destructor)
9131 memfn_quals |= TYPE_QUAL_CONST;
9133 /* Now TYPE has the actual type. */
9138 *attrlist = chainon (returned_attrs, *attrlist);
9140 attrlist = &returned_attrs;
9143 /* Handle parameter packs. */
9144 if (parameter_pack_p)
9146 if (decl_context == PARM)
9147 /* Turn the type into a pack expansion.*/
9148 type = make_pack_expansion (type);
9150 error ("non-parameter %qs cannot be a parameter pack", name);
9153 /* Did array size calculations overflow? */
9155 if (TREE_CODE (type) == ARRAY_TYPE
9156 && COMPLETE_TYPE_P (type)
9157 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9158 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9160 error ("size of array %qs is too large", name);
9161 /* If we proceed with the array type as it is, we'll eventually
9162 crash in tree_low_cst(). */
9163 type = error_mark_node;
9166 if ((decl_context == FIELD || decl_context == PARM)
9167 && !processing_template_decl
9168 && variably_modified_type_p (type, NULL_TREE))
9170 if (decl_context == FIELD)
9171 error ("data member may not have variably modified type %qT", type);
9173 error ("parameter may not have variably modified type %qT", type);
9174 type = error_mark_node;
9177 if (explicitp == 1 || (explicitp && friendp))
9179 /* [dcl.fct.spec] The explicit specifier shall only be used in
9180 declarations of constructors within a class definition. */
9181 error ("only declarations of constructors can be %<explicit%>");
9185 if (storage_class == sc_mutable)
9187 if (decl_context != FIELD || friendp)
9189 error ("non-member %qs cannot be declared %<mutable%>", name);
9190 storage_class = sc_none;
9192 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9194 error ("non-object member %qs cannot be declared %<mutable%>", name);
9195 storage_class = sc_none;
9197 else if (TREE_CODE (type) == FUNCTION_TYPE
9198 || TREE_CODE (type) == METHOD_TYPE)
9200 error ("function %qs cannot be declared %<mutable%>", name);
9201 storage_class = sc_none;
9205 error ("static %qs cannot be declared %<mutable%>", name);
9206 storage_class = sc_none;
9208 else if (type_quals & TYPE_QUAL_CONST)
9210 error ("const %qs cannot be declared %<mutable%>", name);
9211 storage_class = sc_none;
9215 /* If this is declaring a typedef name, return a TYPE_DECL. */
9216 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9220 /* Note that the grammar rejects storage classes
9221 in typenames, fields or parameters. */
9222 if (current_lang_name == lang_name_java)
9223 TYPE_FOR_JAVA (type) = 1;
9225 /* This declaration:
9227 typedef void f(int) const;
9229 declares a function type which is not a member of any
9230 particular class, but which is cv-qualified; for
9231 example "f S::*" declares a pointer to a const-qualified
9232 member function of S. We record the cv-qualification in the
9234 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9236 type = apply_memfn_quals (type, memfn_quals);
9238 /* We have now dealt with these qualifiers. */
9239 memfn_quals = TYPE_UNQUALIFIED;
9242 if (decl_context == FIELD)
9243 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9245 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9246 if (id_declarator && declarator->u.id.qualifying_scope) {
9247 error_at (DECL_SOURCE_LOCATION (decl),
9248 "typedef name may not be a nested-name-specifier");
9249 TREE_TYPE (decl) = error_mark_node;
9252 if (decl_context != FIELD)
9254 if (!current_function_decl)
9255 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9256 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9257 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9258 (current_function_decl)))
9259 /* The TYPE_DECL is "abstract" because there will be
9260 clones of this constructor/destructor, and there will
9261 be copies of this TYPE_DECL generated in those
9263 DECL_ABSTRACT (decl) = 1;
9265 else if (constructor_name_p (unqualified_id, current_class_type))
9266 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9267 "as enclosing class",
9270 /* If the user declares "typedef struct {...} foo" then the
9271 struct will have an anonymous name. Fill that name in now.
9272 Nothing can refer to it, so nothing needs know about the name
9274 if (type != error_mark_node
9277 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9278 && TYPE_ANONYMOUS_P (type)
9279 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9283 /* Replace the anonymous name with the real name everywhere. */
9284 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9286 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9287 /* We do not rename the debug info representing the
9288 anonymous tagged type because the standard says in
9289 [dcl.typedef] that the naming applies only for
9290 linkage purposes. */
9291 /*debug_hooks->set_name (t, decl);*/
9292 TYPE_NAME (t) = decl;
9295 if (TYPE_LANG_SPECIFIC (type))
9296 TYPE_WAS_ANONYMOUS (type) = 1;
9298 /* If this is a typedef within a template class, the nested
9299 type is a (non-primary) template. The name for the
9300 template needs updating as well. */
9301 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9302 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9303 = TYPE_IDENTIFIER (type);
9305 /* Adjust linkage now that we aren't anonymous anymore. */
9306 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9307 determine_visibility (TYPE_MAIN_DECL (type));
9309 /* FIXME remangle member functions; member functions of a
9310 type with external linkage have external linkage. */
9314 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9315 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9317 bad_specifiers (decl, BSP_TYPE, virtualp,
9318 memfn_quals != TYPE_UNQUALIFIED,
9319 inlinep, friendp, raises != NULL_TREE);
9324 /* Detect the case of an array type of unspecified size
9325 which came, as such, direct from a typedef name.
9326 We must copy the type, so that the array's domain can be
9327 individually set by the object's initializer. */
9329 if (type && typedef_type
9330 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9331 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9332 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9334 /* Detect where we're using a typedef of function type to declare a
9335 function. PARMS will not be set, so we must create it now. */
9337 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9339 tree decls = NULL_TREE;
9342 for (args = TYPE_ARG_TYPES (type);
9343 args && args != void_list_node;
9344 args = TREE_CHAIN (args))
9346 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9348 DECL_CHAIN (decl) = decls;
9352 parms = nreverse (decls);
9354 if (decl_context != TYPENAME)
9356 /* A cv-qualifier-seq shall only be part of the function type
9357 for a non-static member function. [8.3.5/4 dcl.fct] */
9358 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9359 && (current_class_type == NULL_TREE || staticp) )
9362 ? G_("qualified function types cannot be used to "
9363 "declare static member functions")
9364 : G_("qualified function types cannot be used to "
9365 "declare free functions"));
9366 type = TYPE_MAIN_VARIANT (type);
9369 /* The qualifiers on the function type become the qualifiers on
9370 the non-static member function. */
9371 memfn_quals |= type_memfn_quals (type);
9372 type_quals = TYPE_UNQUALIFIED;
9376 /* If this is a type name (such as, in a cast or sizeof),
9377 compute the type and return it now. */
9379 if (decl_context == TYPENAME)
9381 /* Note that the grammar rejects storage classes
9382 in typenames, fields or parameters. */
9383 if (type_quals != TYPE_UNQUALIFIED)
9384 type_quals = TYPE_UNQUALIFIED;
9386 /* Special case: "friend class foo" looks like a TYPENAME context. */
9389 if (type_quals != TYPE_UNQUALIFIED)
9391 error ("type qualifiers specified for friend class declaration");
9392 type_quals = TYPE_UNQUALIFIED;
9396 error ("%<inline%> specified for friend class declaration");
9402 /* Don't allow friend declaration without a class-key. */
9403 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9404 permerror (input_location, "template parameters cannot be friends");
9405 else if (TREE_CODE (type) == TYPENAME_TYPE)
9406 permerror (input_location, "friend declaration requires class-key, "
9407 "i.e. %<friend class %T::%D%>",
9408 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9410 permerror (input_location, "friend declaration requires class-key, "
9411 "i.e. %<friend %#T%>",
9415 /* Only try to do this stuff if we didn't already give up. */
9416 if (type != integer_type_node)
9418 /* A friendly class? */
9419 if (current_class_type)
9420 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9423 error ("trying to make class %qT a friend of global scope",
9426 type = void_type_node;
9429 else if (memfn_quals)
9431 if (ctype == NULL_TREE
9432 && TREE_CODE (type) == METHOD_TYPE)
9433 ctype = TYPE_METHOD_BASETYPE (type);
9436 type = build_memfn_type (type, ctype, memfn_quals);
9437 /* Core issue #547: need to allow this in template type args. */
9438 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9439 type = apply_memfn_quals (type, memfn_quals);
9441 error ("invalid qualifiers on non-member function type");
9446 else if (unqualified_id == NULL_TREE && decl_context != PARM
9447 && decl_context != CATCHPARM
9448 && TREE_CODE (type) != UNION_TYPE
9451 error ("abstract declarator %qT used as declaration", type);
9452 return error_mark_node;
9455 /* Only functions may be declared using an operator-function-id. */
9457 && IDENTIFIER_OPNAME_P (unqualified_id)
9458 && TREE_CODE (type) != FUNCTION_TYPE
9459 && TREE_CODE (type) != METHOD_TYPE)
9461 error ("declaration of %qD as non-function", unqualified_id);
9462 return error_mark_node;
9465 /* We don't check parameter types here because we can emit a better
9466 error message later. */
9467 if (decl_context != PARM)
9469 type = check_var_type (unqualified_id, type);
9470 if (type == error_mark_node)
9471 return error_mark_node;
9474 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9475 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9477 if (decl_context == PARM || decl_context == CATCHPARM)
9479 if (ctype || in_namespace)
9480 error ("cannot use %<::%> in parameter declaration");
9482 /* A parameter declared as an array of T is really a pointer to T.
9483 One declared as a function is really a pointer to a function.
9484 One declared as a member is really a pointer to member. */
9486 if (TREE_CODE (type) == ARRAY_TYPE)
9488 /* Transfer const-ness of array into that of type pointed to. */
9489 type = build_pointer_type (TREE_TYPE (type));
9490 type_quals = TYPE_UNQUALIFIED;
9492 else if (TREE_CODE (type) == FUNCTION_TYPE)
9493 type = build_pointer_type (type);
9496 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9497 && !NEW_DELETE_OPNAME_P (unqualified_id))
9498 type = build_memfn_type (type, ctype, memfn_quals);
9503 if (decl_context == PARM)
9505 decl = cp_build_parm_decl (unqualified_id, type);
9507 bad_specifiers (decl, BSP_PARM, virtualp,
9508 memfn_quals != TYPE_UNQUALIFIED,
9509 inlinep, friendp, raises != NULL_TREE);
9511 else if (decl_context == FIELD)
9513 /* The C99 flexible array extension. */
9514 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9515 && TYPE_DOMAIN (type) == NULL_TREE)
9517 tree itype = compute_array_index_type (dname, integer_zero_node,
9518 tf_warning_or_error);
9519 type = build_cplus_array_type (TREE_TYPE (type), itype);
9522 if (type == error_mark_node)
9524 /* Happens when declaring arrays of sizes which
9525 are error_mark_node, for example. */
9528 else if (in_namespace && !friendp)
9530 /* Something like struct S { int N::j; }; */
9531 error ("invalid use of %<::%>");
9532 return error_mark_node;
9534 else if (TREE_CODE (type) == FUNCTION_TYPE
9535 || TREE_CODE (type) == METHOD_TYPE)
9538 tree function_context;
9542 /* This should never happen in pure C++ (the check
9543 could be an assert). It could happen in
9544 Objective-C++ if someone writes invalid code that
9545 uses a function declaration for an instance
9546 variable or property (instance variables and
9547 properties are parsed as FIELD_DECLs, but they are
9548 part of an Objective-C class, not a C++ class).
9549 That code is invalid and is caught by this
9553 error ("declaration of function %qD in invalid context",
9555 return error_mark_node;
9558 /* ``A union may [ ... ] not [ have ] virtual functions.''
9560 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9562 error ("function %qD declared virtual inside a union",
9564 return error_mark_node;
9567 if (NEW_DELETE_OPNAME_P (unqualified_id))
9571 error ("%qD cannot be declared virtual, since it "
9579 /* Check that the name used for a destructor makes sense. */
9580 if (sfk == sfk_destructor)
9582 tree uqname = id_declarator->u.id.unqualified_name;
9586 gcc_assert (friendp);
9587 error ("expected qualified name in friend declaration "
9588 "for destructor %qD", uqname);
9589 return error_mark_node;
9592 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9594 error ("declaration of %qD as member of %qT",
9596 return error_mark_node;
9600 error ("a destructor cannot be %<constexpr%>");
9601 return error_mark_node;
9604 else if (sfk == sfk_constructor && friendp && !ctype)
9606 error ("expected qualified name in friend declaration "
9607 "for constructor %qD",
9608 id_declarator->u.id.unqualified_name);
9609 return error_mark_node;
9612 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9613 function_context = (ctype != NULL_TREE) ?
9614 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9615 publicp = (! friendp || ! staticp)
9616 && function_context == NULL_TREE;
9617 decl = grokfndecl (ctype, type,
9618 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9619 ? unqualified_id : dname,
9622 virtualp, flags, memfn_quals, raises,
9623 friendp ? -1 : 0, friendp, publicp,
9624 inlinep | (2 * constexpr_p),
9626 funcdef_flag, template_count, in_namespace,
9627 attrlist, declarator->id_loc);
9628 if (decl == NULL_TREE)
9629 return error_mark_node;
9631 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9632 /* The decl and setting of decl_attr is also turned off. */
9633 decl = build_decl_attribute_variant (decl, decl_attr);
9636 /* [class.conv.ctor]
9638 A constructor declared without the function-specifier
9639 explicit that can be called with a single parameter
9640 specifies a conversion from the type of its first
9641 parameter to the type of its class. Such a constructor
9642 is called a converting constructor. */
9644 DECL_NONCONVERTING_P (decl) = 1;
9646 else if (!staticp && !dependent_type_p (type)
9647 && !COMPLETE_TYPE_P (complete_type (type))
9648 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9651 error ("field %qD has incomplete type", unqualified_id);
9653 error ("name %qT has incomplete type", type);
9655 /* If we're instantiating a template, tell them which
9656 instantiation made the field's type be incomplete. */
9657 if (current_class_type
9658 && TYPE_NAME (current_class_type)
9659 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9661 && declspecs->type == type)
9662 error (" in instantiation of template %qT",
9663 current_class_type);
9665 return error_mark_node;
9671 error ("%qE is neither function nor member function; "
9672 "cannot be declared friend", unqualified_id);
9680 /* Friends are treated specially. */
9681 if (ctype == current_class_type)
9682 ; /* We already issued a permerror. */
9683 else if (decl && DECL_NAME (decl))
9685 if (template_class_depth (current_class_type) == 0)
9687 decl = check_explicit_specialization
9688 (unqualified_id, decl, template_count,
9689 2 * funcdef_flag + 4);
9690 if (decl == error_mark_node)
9691 return error_mark_node;
9694 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9695 decl = do_friend (ctype, unqualified_id, decl,
9701 return error_mark_node;
9704 /* Structure field. It may not be a function, except for C++. */
9706 if (decl == NULL_TREE)
9712 /* An attempt is being made to initialize a non-static
9713 member. But, from [class.mem]:
9715 4 A member-declarator can contain a
9716 constant-initializer only if it declares a static
9717 member (_class.static_) of integral or enumeration
9718 type, see _class.static.data_.
9720 This used to be relatively common practice, but
9721 the rest of the compiler does not correctly
9722 handle the initialization unless the member is
9723 static so we make it static below. */
9724 if (cxx_dialect >= cxx0x)
9726 sorry ("non-static data member initializers");
9730 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9732 permerror (input_location, "making %qD static", unqualified_id);
9737 if (uses_template_parms (type))
9738 /* We'll check at instantiation time. */
9740 else if (constexpr_p)
9741 /* constexpr has the same requirements. */
9743 else if (check_static_variable_definition (unqualified_id,
9745 /* If we just return the declaration, crashes
9746 will sometimes occur. We therefore return
9747 void_type_node, as if this was a friend
9748 declaration, to cause callers to completely
9749 ignore this declaration. */
9750 return error_mark_node;
9755 /* C++ allows static class members. All other work
9756 for this is done by grokfield. */
9757 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9758 set_linkage_for_static_data_member (decl);
9759 /* Even if there is an in-class initialization, DECL
9760 is considered undefined until an out-of-class
9761 definition is provided. */
9762 DECL_EXTERNAL (decl) = 1;
9765 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9767 if (constexpr_p && !initialized)
9769 error ("constexpr static data member %qD must have an "
9770 "initializer", decl);
9771 constexpr_p = false;
9778 error ("non-static data member %qE declared %<constexpr%>",
9780 constexpr_p = false;
9782 decl = build_decl (input_location,
9783 FIELD_DECL, unqualified_id, type);
9784 DECL_NONADDRESSABLE_P (decl) = bitfield;
9785 if (bitfield && !unqualified_id)
9786 TREE_NO_WARNING (decl) = 1;
9788 if (storage_class == sc_mutable)
9790 DECL_MUTABLE_P (decl) = 1;
9791 storage_class = sc_none;
9795 bad_specifiers (decl, BSP_FIELD, virtualp,
9796 memfn_quals != TYPE_UNQUALIFIED,
9797 inlinep, friendp, raises != NULL_TREE);
9800 else if (TREE_CODE (type) == FUNCTION_TYPE
9801 || TREE_CODE (type) == METHOD_TYPE)
9806 if (!unqualified_id)
9807 return error_mark_node;
9809 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9810 original_name = dname;
9812 original_name = unqualified_id;
9814 if (storage_class == sc_auto)
9815 error ("storage class %<auto%> invalid for function %qs", name);
9816 else if (storage_class == sc_register)
9817 error ("storage class %<register%> invalid for function %qs", name);
9819 error ("storage class %<__thread%> invalid for function %qs", name);
9821 /* Function declaration not at top level.
9822 Storage classes other than `extern' are not allowed
9823 and `extern' makes no difference. */
9824 if (! toplevel_bindings_p ()
9825 && (storage_class == sc_static
9826 || declspecs->specs[(int)ds_inline])
9829 if (storage_class == sc_static)
9830 pedwarn (input_location, OPT_pedantic,
9831 "%<static%> specified invalid for function %qs "
9832 "declared out of global scope", name);
9834 pedwarn (input_location, OPT_pedantic,
9835 "%<inline%> specifier invalid for function %qs "
9836 "declared out of global scope", name);
9839 if (ctype != NULL_TREE
9840 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9842 error ("%q#T is not a class or a namespace", ctype);
9846 if (ctype == NULL_TREE)
9850 error ("virtual non-class function %qs", name);
9853 else if (sfk == sfk_constructor
9854 || sfk == sfk_destructor)
9857 ? "%qs defined in a non-class scope"
9858 : "%qs declared in a non-class scope", name);
9863 /* Record presence of `static'. */
9864 publicp = (ctype != NULL_TREE
9865 || storage_class == sc_extern
9866 || storage_class != sc_static);
9868 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9869 virtualp, flags, memfn_quals, raises,
9871 publicp, inlinep | (2 * constexpr_p), sfk,
9873 template_count, in_namespace, attrlist,
9874 declarator->id_loc);
9875 if (decl == NULL_TREE)
9876 return error_mark_node;
9880 int invalid_static = 0;
9882 /* Don't allow a static member function in a class, and forbid
9883 declaring main to be static. */
9884 if (TREE_CODE (type) == METHOD_TYPE)
9886 permerror (input_location, "cannot declare member function %qD to have "
9887 "static linkage", decl);
9890 else if (current_function_decl)
9892 /* FIXME need arm citation */
9893 error ("cannot declare static function inside another function");
9900 storage_class = sc_none;
9906 /* It's a variable. */
9908 /* An uninitialized decl with `extern' is a reference. */
9909 decl = grokvardecl (type, unqualified_id,
9912 (type_quals & TYPE_QUAL_CONST) != 0,
9913 ctype ? ctype : in_namespace);
9914 bad_specifiers (decl, BSP_VAR, virtualp,
9915 memfn_quals != TYPE_UNQUALIFIED,
9916 inlinep, friendp, raises != NULL_TREE);
9920 DECL_CONTEXT (decl) = ctype;
9923 permerror (input_location, "%<static%> may not be used when defining "
9924 "(as opposed to declaring) a static data member");
9926 storage_class = sc_none;
9928 if (storage_class == sc_register && TREE_STATIC (decl))
9930 error ("static member %qD declared %<register%>", decl);
9931 storage_class = sc_none;
9933 if (storage_class == sc_extern && pedantic)
9935 pedwarn (input_location, OPT_pedantic,
9936 "cannot explicitly declare member %q#D to have "
9937 "extern linkage", decl);
9938 storage_class = sc_none;
9941 else if (constexpr_p && DECL_EXTERNAL (decl))
9942 error ("declaration of constexpr variable %qD is not a definition",
9946 if (storage_class == sc_extern && initialized && !funcdef_flag)
9948 if (toplevel_bindings_p ())
9950 /* It's common practice (and completely valid) to have a const
9951 be initialized and declared extern. */
9952 if (!(type_quals & TYPE_QUAL_CONST))
9953 warning (0, "%qs initialized and declared %<extern%>", name);
9957 error ("%qs has both %<extern%> and initializer", name);
9958 return error_mark_node;
9962 /* Record `register' declaration for warnings on &
9963 and in case doing stupid register allocation. */
9965 if (storage_class == sc_register)
9966 DECL_REGISTER (decl) = 1;
9967 else if (storage_class == sc_extern)
9968 DECL_THIS_EXTERN (decl) = 1;
9969 else if (storage_class == sc_static)
9970 DECL_THIS_STATIC (decl) = 1;
9972 /* Don't forget constexprness. */
9974 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9976 /* Record constancy and volatility on the DECL itself . There's
9977 no need to do this when processing a template; we'll do this
9978 for the instantiated declaration based on the type of DECL. */
9979 if (!processing_template_decl)
9980 cp_apply_type_quals_to_decl (type_quals, decl);
9986 /* Subroutine of start_function. Ensure that each of the parameter
9987 types (as listed in PARMS) is complete, as is required for a
9988 function definition. */
9991 require_complete_types_for_parms (tree parms)
9993 for (; parms; parms = DECL_CHAIN (parms))
9995 if (dependent_type_p (TREE_TYPE (parms)))
9997 if (!VOID_TYPE_P (TREE_TYPE (parms))
9998 && complete_type_or_else (TREE_TYPE (parms), parms))
10000 relayout_decl (parms);
10001 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10004 /* grokparms or complete_type_or_else will have already issued
10006 TREE_TYPE (parms) = error_mark_node;
10010 /* Returns nonzero if T is a local variable. */
10013 local_variable_p (const_tree t)
10015 if ((TREE_CODE (t) == VAR_DECL
10016 /* A VAR_DECL with a context that is a _TYPE is a static data
10018 && !TYPE_P (CP_DECL_CONTEXT (t))
10019 /* Any other non-local variable must be at namespace scope. */
10020 && !DECL_NAMESPACE_SCOPE_P (t))
10021 || (TREE_CODE (t) == PARM_DECL))
10027 /* Like local_variable_p, but suitable for use as a tree-walking
10031 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10032 void *data ATTRIBUTE_UNUSED)
10034 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10036 else if (TYPE_P (*tp))
10037 *walk_subtrees = 0;
10043 /* Check that ARG, which is a default-argument expression for a
10044 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10045 something goes wrong. DECL may also be a _TYPE node, rather than a
10046 DECL, if there is no DECL available. */
10049 check_default_argument (tree decl, tree arg)
10054 if (TREE_CODE (arg) == DEFAULT_ARG)
10055 /* We get a DEFAULT_ARG when looking at an in-class declaration
10056 with a default argument. Ignore the argument for now; we'll
10057 deal with it after the class is complete. */
10066 decl_type = TREE_TYPE (decl);
10068 if (arg == error_mark_node
10069 || decl == error_mark_node
10070 || TREE_TYPE (arg) == error_mark_node
10071 || decl_type == error_mark_node)
10072 /* Something already went wrong. There's no need to check
10074 return error_mark_node;
10076 /* [dcl.fct.default]
10078 A default argument expression is implicitly converted to the
10080 if (!TREE_TYPE (arg)
10081 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10084 error ("default argument for %q#D has type %qT",
10085 decl, TREE_TYPE (arg));
10087 error ("default argument for parameter of type %qT has type %qT",
10088 decl_type, TREE_TYPE (arg));
10090 return error_mark_node;
10093 /* [dcl.fct.default]
10095 Local variables shall not be used in default argument
10098 The keyword `this' shall not be used in a default argument of a
10099 member function. */
10100 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10103 error ("default argument %qE uses local variable %qD", arg, var);
10104 return error_mark_node;
10111 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10114 type_is_deprecated (tree type)
10116 enum tree_code code;
10117 if (TREE_DEPRECATED (type))
10119 if (TYPE_NAME (type)
10120 && TREE_DEPRECATED (TYPE_NAME (type)))
10123 /* Do warn about using typedefs to a deprecated class. */
10124 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10125 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10127 code = TREE_CODE (type);
10129 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10130 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10131 || code == METHOD_TYPE || code == ARRAY_TYPE)
10132 return type_is_deprecated (TREE_TYPE (type));
10134 if (TYPE_PTRMEMFUNC_P (type))
10135 return type_is_deprecated
10136 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10141 /* Decode the list of parameter types for a function type.
10142 Given the list of things declared inside the parens,
10143 return a list of types.
10145 If this parameter does not end with an ellipsis, we append
10148 *PARMS is set to the chain of PARM_DECLs created. */
10151 grokparms (tree parmlist, tree *parms)
10153 tree result = NULL_TREE;
10154 tree decls = NULL_TREE;
10158 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10160 tree type = NULL_TREE;
10161 tree init = TREE_PURPOSE (parm);
10162 tree decl = TREE_VALUE (parm);
10163 const char *errmsg;
10165 if (parm == void_list_node)
10168 if (! decl || TREE_TYPE (decl) == error_mark_node)
10171 type = TREE_TYPE (decl);
10172 if (VOID_TYPE_P (type))
10174 if (same_type_p (type, void_type_node)
10175 && DECL_SELF_REFERENCE_P (type)
10176 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10177 /* this is a parmlist of `(void)', which is ok. */
10179 cxx_incomplete_type_error (decl, type);
10180 /* It's not a good idea to actually create parameters of
10181 type `void'; other parts of the compiler assume that a
10182 void type terminates the parameter list. */
10183 type = error_mark_node;
10184 TREE_TYPE (decl) = error_mark_node;
10187 if (type != error_mark_node
10188 && TYPE_FOR_JAVA (type)
10189 && MAYBE_CLASS_TYPE_P (type))
10191 error ("parameter %qD has Java class type", decl);
10192 type = error_mark_node;
10193 TREE_TYPE (decl) = error_mark_node;
10197 if (type != error_mark_node
10198 && (errmsg = targetm.invalid_parameter_type (type)))
10201 type = error_mark_node;
10202 TREE_TYPE (decl) = error_mark_node;
10205 if (type != error_mark_node)
10207 if (deprecated_state != DEPRECATED_SUPPRESS)
10209 tree deptype = type_is_deprecated (type);
10211 warn_deprecated_use (deptype, NULL_TREE);
10214 /* Top-level qualifiers on the parameters are
10215 ignored for function types. */
10216 type = cp_build_qualified_type (type, 0);
10217 if (TREE_CODE (type) == METHOD_TYPE)
10219 error ("parameter %qD invalidly declared method type", decl);
10220 type = build_pointer_type (type);
10221 TREE_TYPE (decl) = type;
10223 else if (abstract_virtuals_error (decl, type))
10224 any_error = 1; /* Seems like a good idea. */
10225 else if (POINTER_TYPE_P (type))
10227 /* [dcl.fct]/6, parameter types cannot contain pointers
10228 (references) to arrays of unknown bound. */
10229 tree t = TREE_TYPE (type);
10230 int ptr = TYPE_PTR_P (type);
10234 if (TYPE_PTR_P (t))
10236 else if (TREE_CODE (t) != ARRAY_TYPE)
10238 else if (!TYPE_DOMAIN (t))
10242 if (TREE_CODE (t) == ARRAY_TYPE)
10244 ? G_("parameter %qD includes pointer to array of "
10245 "unknown bound %qT")
10246 : G_("parameter %qD includes reference to array of "
10247 "unknown bound %qT"),
10253 else if (init && !processing_template_decl)
10254 init = check_default_argument (decl, init);
10257 if (TREE_CODE (decl) == PARM_DECL
10258 && FUNCTION_PARAMETER_PACK_P (decl)
10259 && TREE_CHAIN (parm)
10260 && TREE_CHAIN (parm) != void_list_node)
10261 error ("parameter packs must be at the end of the parameter list");
10263 DECL_CHAIN (decl) = decls;
10265 result = tree_cons (init, type, result);
10267 decls = nreverse (decls);
10268 result = nreverse (result);
10270 result = chainon (result, void_list_node);
10277 /* D is a constructor or overloaded `operator='.
10279 Let T be the class in which D is declared. Then, this function
10282 -1 if D's is an ill-formed constructor or copy assignment operator
10283 whose first parameter is of type `T'.
10284 0 if D is not a copy constructor or copy assignment
10286 1 if D is a copy constructor or copy assignment operator whose
10287 first parameter is a reference to non-const qualified T.
10288 2 if D is a copy constructor or copy assignment operator whose
10289 first parameter is a reference to const qualified T.
10291 This function can be used as a predicate. Positive values indicate
10292 a copy constructor and nonzero values indicate a copy assignment
10296 copy_fn_p (const_tree d)
10302 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10304 if (TREE_CODE (d) == TEMPLATE_DECL
10305 || (DECL_TEMPLATE_INFO (d)
10306 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10307 /* Instantiations of template member functions are never copy
10308 functions. Note that member functions of templated classes are
10309 represented as template functions internally, and we must
10310 accept those as copy functions. */
10313 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10317 arg_type = TREE_VALUE (args);
10318 if (arg_type == error_mark_node)
10321 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10323 /* Pass by value copy assignment operator. */
10326 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10327 && !TYPE_REF_IS_RVALUE (arg_type)
10328 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10330 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10336 args = TREE_CHAIN (args);
10338 if (args && args != void_list_node && !TREE_PURPOSE (args))
10339 /* There are more non-optional args. */
10345 /* D is a constructor or overloaded `operator='.
10347 Let T be the class in which D is declared. Then, this function
10348 returns true when D is a move constructor or move assignment
10349 operator, false otherwise. */
10352 move_fn_p (const_tree d)
10356 bool result = false;
10358 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10360 if (cxx_dialect == cxx98)
10361 /* There are no move constructors if we are in C++98 mode. */
10364 if (TREE_CODE (d) == TEMPLATE_DECL
10365 || (DECL_TEMPLATE_INFO (d)
10366 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10367 /* Instantiations of template member functions are never copy
10368 functions. Note that member functions of templated classes are
10369 represented as template functions internally, and we must
10370 accept those as copy functions. */
10373 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10377 arg_type = TREE_VALUE (args);
10378 if (arg_type == error_mark_node)
10381 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10382 && TYPE_REF_IS_RVALUE (arg_type)
10383 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10387 args = TREE_CHAIN (args);
10389 if (args && args != void_list_node && !TREE_PURPOSE (args))
10390 /* There are more non-optional args. */
10396 /* Remember any special properties of member function DECL. */
10399 grok_special_member_properties (tree decl)
10403 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10406 class_type = DECL_CONTEXT (decl);
10407 if (DECL_CONSTRUCTOR_P (decl))
10409 int ctor = copy_fn_p (decl);
10411 if (!DECL_ARTIFICIAL (decl))
10412 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10418 A non-template constructor for class X is a copy
10419 constructor if its first parameter is of type X&, const
10420 X&, volatile X& or const volatile X&, and either there
10421 are no other parameters or else all other parameters have
10422 default arguments. */
10423 TYPE_HAS_COPY_CTOR (class_type) = 1;
10424 if (user_provided_p (decl))
10425 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10427 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10429 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10431 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10432 if (user_provided_p (decl))
10433 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10435 else if (move_fn_p (decl) && user_provided_p (decl))
10436 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10437 else if (is_list_ctor (decl))
10438 TYPE_HAS_LIST_CTOR (class_type) = 1;
10440 if (DECL_DECLARED_CONSTEXPR_P (decl)
10441 && !copy_fn_p (decl) && !move_fn_p (decl))
10442 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10444 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10448 A non-template assignment operator for class X is a copy
10449 assignment operator if its parameter is of type X, X&, const
10450 X&, volatile X& or const volatile X&. */
10452 int assop = copy_fn_p (decl);
10456 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10457 if (user_provided_p (decl))
10458 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10460 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10462 else if (move_fn_p (decl) && user_provided_p (decl))
10463 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10465 /* Destructors are handled in check_methods. */
10468 /* Check a constructor DECL has the correct form. Complains
10469 if the class has a constructor of the form X(X). */
10472 grok_ctor_properties (const_tree ctype, const_tree decl)
10474 int ctor_parm = copy_fn_p (decl);
10480 A declaration of a constructor for a class X is ill-formed if
10481 its first parameter is of type (optionally cv-qualified) X
10482 and either there are no other parameters or else all other
10483 parameters have default arguments.
10485 We *don't* complain about member template instantiations that
10486 have this form, though; they can occur as we try to decide
10487 what constructor to use during overload resolution. Since
10488 overload resolution will never prefer such a constructor to
10489 the non-template copy constructor (which is either explicitly
10490 or implicitly defined), there's no need to worry about their
10491 existence. Theoretically, they should never even be
10492 instantiated, but that's hard to forestall. */
10493 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10501 /* An operator with this code is unary, but can also be binary. */
10504 ambi_op_p (enum tree_code code)
10506 return (code == INDIRECT_REF
10507 || code == ADDR_EXPR
10508 || code == UNARY_PLUS_EXPR
10509 || code == NEGATE_EXPR
10510 || code == PREINCREMENT_EXPR
10511 || code == PREDECREMENT_EXPR);
10514 /* An operator with this name can only be unary. */
10517 unary_op_p (enum tree_code code)
10519 return (code == TRUTH_NOT_EXPR
10520 || code == BIT_NOT_EXPR
10521 || code == COMPONENT_REF
10522 || code == TYPE_EXPR);
10525 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10526 errors are issued for invalid declarations. */
10529 grok_op_properties (tree decl, bool complain)
10531 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10533 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10534 tree name = DECL_NAME (decl);
10535 enum tree_code operator_code;
10540 /* Count the number of arguments and check for ellipsis. */
10541 for (argtype = argtypes, arity = 0;
10542 argtype && argtype != void_list_node;
10543 argtype = TREE_CHAIN (argtype))
10545 ellipsis_p = !argtype;
10547 class_type = DECL_CONTEXT (decl);
10548 if (class_type && !CLASS_TYPE_P (class_type))
10549 class_type = NULL_TREE;
10551 if (DECL_CONV_FN_P (decl))
10552 operator_code = TYPE_EXPR;
10556 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10557 if (ansi_opname (CODE) == name) \
10559 operator_code = (CODE); \
10562 else if (ansi_assopname (CODE) == name) \
10564 operator_code = (CODE); \
10565 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10569 #include "operators.def"
10570 #undef DEF_OPERATOR
10572 gcc_unreachable ();
10575 gcc_assert (operator_code != MAX_TREE_CODES);
10576 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10579 switch (operator_code)
10582 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10586 TYPE_GETS_DELETE (class_type) |= 1;
10590 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10593 case VEC_DELETE_EXPR:
10594 TYPE_GETS_DELETE (class_type) |= 2;
10601 /* [basic.std.dynamic.allocation]/1:
10603 A program is ill-formed if an allocation function is declared
10604 in a namespace scope other than global scope or declared static
10607 The same also holds true for deallocation functions. */
10608 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10609 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10611 if (DECL_NAMESPACE_SCOPE_P (decl))
10613 if (CP_DECL_CONTEXT (decl) != global_namespace)
10615 error ("%qD may not be declared within a namespace", decl);
10618 else if (!TREE_PUBLIC (decl))
10620 error ("%qD may not be declared as static", decl);
10626 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10628 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10629 DECL_IS_OPERATOR_NEW (decl) = 1;
10631 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10632 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10635 /* An operator function must either be a non-static member function
10636 or have at least one parameter of a class, a reference to a class,
10637 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10638 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10640 if (operator_code == TYPE_EXPR
10641 || operator_code == CALL_EXPR
10642 || operator_code == COMPONENT_REF
10643 || operator_code == ARRAY_REF
10644 || operator_code == NOP_EXPR)
10646 error ("%qD must be a nonstatic member function", decl);
10653 if (DECL_STATIC_FUNCTION_P (decl))
10655 error ("%qD must be either a non-static member "
10656 "function or a non-member function", decl);
10660 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10662 tree arg = non_reference (TREE_VALUE (p));
10663 if (arg == error_mark_node)
10666 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10667 because these checks are performed even on
10668 template functions. */
10669 if (MAYBE_CLASS_TYPE_P (arg)
10670 || TREE_CODE (arg) == ENUMERAL_TYPE)
10674 if (!p || p == void_list_node)
10677 error ("%qD must have an argument of class or "
10678 "enumerated type", decl);
10684 /* There are no restrictions on the arguments to an overloaded
10686 if (operator_code == CALL_EXPR)
10689 /* Warn about conversion operators that will never be used. */
10690 if (IDENTIFIER_TYPENAME_P (name)
10691 && ! DECL_TEMPLATE_INFO (decl)
10693 /* Warn only declaring the function; there is no need to
10694 warn again about out-of-class definitions. */
10695 && class_type == current_class_type)
10697 tree t = TREE_TYPE (name);
10698 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10701 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10703 if (TREE_CODE (t) == VOID_TYPE)
10704 warning (OPT_Wconversion,
10706 ? G_("conversion to a reference to void "
10707 "will never use a type conversion operator")
10708 : G_("conversion to void "
10709 "will never use a type conversion operator"));
10710 else if (class_type)
10712 if (t == class_type)
10713 warning (OPT_Wconversion,
10715 ? G_("conversion to a reference to the same type "
10716 "will never use a type conversion operator")
10717 : G_("conversion to the same type "
10718 "will never use a type conversion operator"));
10719 /* Don't force t to be complete here. */
10720 else if (MAYBE_CLASS_TYPE_P (t)
10721 && COMPLETE_TYPE_P (t)
10722 && DERIVED_FROM_P (t, class_type))
10723 warning (OPT_Wconversion,
10725 ? G_("conversion to a reference to a base class "
10726 "will never use a type conversion operator")
10727 : G_("conversion to a base class "
10728 "will never use a type conversion operator"));
10733 if (operator_code == COND_EXPR)
10736 error ("ISO C++ prohibits overloading operator ?:");
10739 else if (ellipsis_p)
10741 error ("%qD must not have variable number of arguments", decl);
10744 else if (ambi_op_p (operator_code))
10747 /* We pick the one-argument operator codes by default, so
10748 we don't have to change anything. */
10750 else if (arity == 2)
10752 /* If we thought this was a unary operator, we now know
10753 it to be a binary operator. */
10754 switch (operator_code)
10757 operator_code = MULT_EXPR;
10761 operator_code = BIT_AND_EXPR;
10764 case UNARY_PLUS_EXPR:
10765 operator_code = PLUS_EXPR;
10769 operator_code = MINUS_EXPR;
10772 case PREINCREMENT_EXPR:
10773 operator_code = POSTINCREMENT_EXPR;
10776 case PREDECREMENT_EXPR:
10777 operator_code = POSTDECREMENT_EXPR;
10781 gcc_unreachable ();
10784 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10786 if ((operator_code == POSTINCREMENT_EXPR
10787 || operator_code == POSTDECREMENT_EXPR)
10788 && ! processing_template_decl
10789 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10792 error ("postfix %qD must take %<int%> as its argument",
10795 error ("postfix %qD must take %<int%> as its second "
10803 error ("%qD must take either zero or one argument", decl);
10805 error ("%qD must take either one or two arguments", decl);
10809 /* More Effective C++ rule 6. */
10811 && (operator_code == POSTINCREMENT_EXPR
10812 || operator_code == POSTDECREMENT_EXPR
10813 || operator_code == PREINCREMENT_EXPR
10814 || operator_code == PREDECREMENT_EXPR))
10816 tree arg = TREE_VALUE (argtypes);
10817 tree ret = TREE_TYPE (TREE_TYPE (decl));
10818 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10819 arg = TREE_TYPE (arg);
10820 arg = TYPE_MAIN_VARIANT (arg);
10821 if (operator_code == PREINCREMENT_EXPR
10822 || operator_code == PREDECREMENT_EXPR)
10824 if (TREE_CODE (ret) != REFERENCE_TYPE
10825 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10827 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10828 build_reference_type (arg));
10832 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10833 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10837 else if (unary_op_p (operator_code))
10842 error ("%qD must take %<void%>", decl);
10844 error ("%qD must take exactly one argument", decl);
10848 else /* if (binary_op_p (operator_code)) */
10853 error ("%qD must take exactly one argument", decl);
10855 error ("%qD must take exactly two arguments", decl);
10859 /* More Effective C++ rule 7. */
10861 && (operator_code == TRUTH_ANDIF_EXPR
10862 || operator_code == TRUTH_ORIF_EXPR
10863 || operator_code == COMPOUND_EXPR))
10864 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10868 /* Effective C++ rule 23. */
10871 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10872 && (operator_code == PLUS_EXPR
10873 || operator_code == MINUS_EXPR
10874 || operator_code == TRUNC_DIV_EXPR
10875 || operator_code == MULT_EXPR
10876 || operator_code == TRUNC_MOD_EXPR)
10877 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10878 warning (OPT_Weffc__, "%qD should return by value", decl);
10880 /* [over.oper]/8 */
10881 for (; argtypes && argtypes != void_list_node;
10882 argtypes = TREE_CHAIN (argtypes))
10883 if (TREE_PURPOSE (argtypes))
10885 TREE_PURPOSE (argtypes) = NULL_TREE;
10886 if (operator_code == POSTINCREMENT_EXPR
10887 || operator_code == POSTDECREMENT_EXPR)
10889 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10894 error ("%qD cannot have default arguments", decl);
10902 /* Return a string giving the keyword associate with CODE. */
10904 static const char *
10905 tag_name (enum tag_types code)
10917 case typename_type:
10920 gcc_unreachable ();
10924 /* Name lookup in an elaborated-type-specifier (after the keyword
10925 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10926 elaborated-type-specifier is invalid, issue a diagnostic and return
10927 error_mark_node; otherwise, return the *_TYPE to which it referred.
10928 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10931 check_elaborated_type_specifier (enum tag_types tag_code,
10933 bool allow_template_p)
10939 struct S { struct S *p; };
10941 name lookup will find the TYPE_DECL for the implicit "S::S"
10942 typedef. Adjust for that here. */
10943 if (DECL_SELF_REFERENCE_P (decl))
10944 decl = TYPE_NAME (TREE_TYPE (decl));
10946 type = TREE_TYPE (decl);
10948 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10949 is false for this case as well. */
10950 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10952 error ("using template type parameter %qT after %qs",
10953 type, tag_name (tag_code));
10954 return error_mark_node;
10958 If the identifier resolves to a typedef-name or a template
10959 type-parameter, the elaborated-type-specifier is ill-formed.
10961 In other words, the only legitimate declaration to use in the
10962 elaborated type specifier is the implicit typedef created when
10963 the type is declared. */
10964 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10965 && !DECL_SELF_REFERENCE_P (decl)
10966 && tag_code != typename_type)
10968 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10969 error ("%q+D has a previous declaration here", decl);
10970 return error_mark_node;
10972 else if (TREE_CODE (type) != RECORD_TYPE
10973 && TREE_CODE (type) != UNION_TYPE
10974 && tag_code != enum_type
10975 && tag_code != typename_type)
10977 error ("%qT referred to as %qs", type, tag_name (tag_code));
10978 error ("%q+T has a previous declaration here", type);
10979 return error_mark_node;
10981 else if (TREE_CODE (type) != ENUMERAL_TYPE
10982 && tag_code == enum_type)
10984 error ("%qT referred to as enum", type);
10985 error ("%q+T has a previous declaration here", type);
10986 return error_mark_node;
10988 else if (!allow_template_p
10989 && TREE_CODE (type) == RECORD_TYPE
10990 && CLASSTYPE_IS_TEMPLATE (type))
10992 /* If a class template appears as elaborated type specifier
10993 without a template header such as:
10995 template <class T> class C {};
10996 void f(class C); // No template header here
10998 then the required template argument is missing. */
10999 error ("template argument required for %<%s %T%>",
11000 tag_name (tag_code),
11001 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11002 return error_mark_node;
11008 /* Lookup NAME in elaborate type specifier in scope according to
11009 SCOPE and issue diagnostics if necessary.
11010 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11011 found, and ERROR_MARK_NODE for type error. */
11014 lookup_and_check_tag (enum tag_types tag_code, tree name,
11015 tag_scope scope, bool template_header_p)
11019 if (scope == ts_global)
11021 /* First try ordinary name lookup, ignoring hidden class name
11022 injected via friend declaration. */
11023 decl = lookup_name_prefer_type (name, 2);
11024 /* If that fails, the name will be placed in the smallest
11025 non-class, non-function-prototype scope according to 3.3.1/5.
11026 We may already have a hidden name declared as friend in this
11027 scope. So lookup again but not ignoring hidden names.
11028 If we find one, that name will be made visible rather than
11029 creating a new tag. */
11031 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11034 decl = lookup_type_scope (name, scope);
11036 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11037 decl = DECL_TEMPLATE_RESULT (decl);
11039 if (decl && TREE_CODE (decl) == TYPE_DECL)
11041 /* Look for invalid nested type:
11045 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11047 error ("%qD has the same name as the class in which it is "
11050 return error_mark_node;
11053 /* Two cases we need to consider when deciding if a class
11054 template is allowed as an elaborated type specifier:
11055 1. It is a self reference to its own class.
11056 2. It comes with a template header.
11060 template <class T> class C {
11061 class C *c1; // DECL_SELF_REFERENCE_P is true
11064 template <class U> class C; // template_header_p is true
11065 template <class T> class C<T>::D {
11066 class C *c2; // DECL_SELF_REFERENCE_P is true
11069 t = check_elaborated_type_specifier (tag_code,
11072 | DECL_SELF_REFERENCE_P (decl));
11075 else if (decl && TREE_CODE (decl) == TREE_LIST)
11077 error ("reference to %qD is ambiguous", name);
11078 print_candidates (decl);
11079 return error_mark_node;
11085 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11086 Define the tag as a forward-reference if it is not defined.
11088 If a declaration is given, process it here, and report an error if
11089 multiple declarations are not identical.
11091 SCOPE is TS_CURRENT when this is also a definition. Only look in
11092 the current frame for the name (since C++ allows new names in any
11093 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11094 declaration. Only look beginning from the current scope outward up
11095 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11097 TEMPLATE_HEADER_P is true when this declaration is preceded by
11098 a set of template parameters. */
11101 xref_tag (enum tag_types tag_code, tree name,
11102 tag_scope scope, bool template_header_p)
11104 enum tree_code code;
11106 tree context = NULL_TREE;
11108 timevar_push (TV_NAME_LOOKUP);
11110 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11116 code = RECORD_TYPE;
11122 code = ENUMERAL_TYPE;
11125 gcc_unreachable ();
11128 /* In case of anonymous name, xref_tag is only called to
11129 make type node and push name. Name lookup is not required. */
11130 if (ANON_AGGRNAME_P (name))
11133 t = lookup_and_check_tag (tag_code, name,
11134 scope, template_header_p);
11136 if (t == error_mark_node)
11137 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11139 if (scope != ts_current && t && current_class_type
11140 && template_class_depth (current_class_type)
11141 && template_header_p)
11143 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11144 definition of this tag. Since, in addition, we are currently
11145 processing a (member) template declaration of a template
11146 class, we must be very careful; consider:
11153 { template <class V>
11154 friend struct S1; };
11156 Here, the S2::S1 declaration should not be confused with the
11157 outer declaration. In particular, the inner version should
11158 have a template parameter of level 2, not level 1. This
11159 would be particularly important if the member declaration
11162 template <class V = U> friend struct S1;
11164 say, when we should tsubst into `U' when instantiating
11165 S2. On the other hand, when presented with:
11175 we must find the inner binding eventually. We
11176 accomplish this by making sure that the new type we
11177 create to represent this declaration has the right
11179 context = TYPE_CONTEXT (t);
11185 /* If no such tag is yet defined, create a forward-reference node
11186 and record it as the "definition".
11187 When a real declaration of this type is found,
11188 the forward-reference will be altered into a real type. */
11189 if (code == ENUMERAL_TYPE)
11191 error ("use of enum %q#D without previous declaration", name);
11192 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11196 t = make_class_type (code);
11197 TYPE_CONTEXT (t) = context;
11198 t = pushtag (name, t, scope);
11203 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11205 if (!redeclare_class_template (t, current_template_parms))
11206 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11208 else if (!processing_template_decl
11209 && CLASS_TYPE_P (t)
11210 && CLASSTYPE_IS_TEMPLATE (t))
11212 error ("redeclaration of %qT as a non-template", t);
11213 error ("previous declaration %q+D", t);
11214 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11217 /* Make injected friend class visible. */
11218 if (scope != ts_within_enclosing_non_class
11219 && hidden_name_p (TYPE_NAME (t)))
11221 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11222 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11224 if (TYPE_TEMPLATE_INFO (t))
11226 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11227 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11232 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11236 xref_tag_from_type (tree old, tree id, tag_scope scope)
11238 enum tag_types tag_kind;
11240 if (TREE_CODE (old) == RECORD_TYPE)
11241 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11243 tag_kind = union_type;
11245 if (id == NULL_TREE)
11246 id = TYPE_IDENTIFIER (old);
11248 return xref_tag (tag_kind, id, scope, false);
11251 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11252 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11253 access_* node, and the TREE_VALUE is the type of the base-class.
11254 Non-NULL TREE_TYPE indicates virtual inheritance.
11256 Returns true if the binfo hierarchy was successfully created,
11257 false if an error was detected. */
11260 xref_basetypes (tree ref, tree base_list)
11263 tree binfo, base_binfo;
11264 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11265 unsigned max_bases = 0; /* Maximum direct bases. */
11267 tree default_access;
11268 tree igo_prev; /* Track Inheritance Graph Order. */
11270 if (ref == error_mark_node)
11273 /* The base of a derived class is private by default, all others are
11275 default_access = (TREE_CODE (ref) == RECORD_TYPE
11276 && CLASSTYPE_DECLARED_CLASS (ref)
11277 ? access_private_node : access_public_node);
11279 /* First, make sure that any templates in base-classes are
11280 instantiated. This ensures that if we call ourselves recursively
11281 we do not get confused about which classes are marked and which
11283 basep = &base_list;
11286 tree basetype = TREE_VALUE (*basep);
11288 if (!(processing_template_decl && uses_template_parms (basetype))
11289 && !complete_type_or_else (basetype, NULL))
11290 /* An incomplete type. Remove it from the list. */
11291 *basep = TREE_CHAIN (*basep);
11295 if (TREE_TYPE (*basep))
11297 if (CLASS_TYPE_P (basetype))
11298 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11299 basep = &TREE_CHAIN (*basep);
11303 TYPE_MARKED_P (ref) = 1;
11305 /* The binfo slot should be empty, unless this is an (ill-formed)
11307 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11309 error ("redefinition of %q#T", ref);
11313 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11315 binfo = make_tree_binfo (max_bases);
11317 TYPE_BINFO (ref) = binfo;
11318 BINFO_OFFSET (binfo) = size_zero_node;
11319 BINFO_TYPE (binfo) = ref;
11321 /* Apply base-class info set up to the variants of this type. */
11322 fixup_type_variants (ref);
11326 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11327 /* An aggregate cannot have baseclasses. */
11328 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11330 if (TREE_CODE (ref) == UNION_TYPE)
11332 error ("derived union %qT invalid", ref);
11339 if (TYPE_FOR_JAVA (ref))
11341 error ("Java class %qT cannot have multiple bases", ref);
11348 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11350 if (TYPE_FOR_JAVA (ref))
11352 error ("Java class %qT cannot have virtual bases", ref);
11357 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11359 tree access = TREE_PURPOSE (base_list);
11360 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11361 tree basetype = TREE_VALUE (base_list);
11363 if (access == access_default_node)
11364 access = default_access;
11366 if (PACK_EXPANSION_P (basetype))
11367 basetype = PACK_EXPANSION_PATTERN (basetype);
11368 if (TREE_CODE (basetype) == TYPE_DECL)
11369 basetype = TREE_TYPE (basetype);
11370 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11372 error ("base type %qT fails to be a struct or class type",
11377 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11378 TYPE_FOR_JAVA (ref) = 1;
11380 base_binfo = NULL_TREE;
11381 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11383 base_binfo = TYPE_BINFO (basetype);
11384 /* The original basetype could have been a typedef'd type. */
11385 basetype = BINFO_TYPE (base_binfo);
11387 /* Inherit flags from the base. */
11388 TYPE_HAS_NEW_OPERATOR (ref)
11389 |= TYPE_HAS_NEW_OPERATOR (basetype);
11390 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11391 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11392 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11393 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11394 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11395 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11396 CLASSTYPE_REPEATED_BASE_P (ref)
11397 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11400 /* We must do this test after we've seen through a typedef
11402 if (TYPE_MARKED_P (basetype))
11404 if (basetype == ref)
11405 error ("recursive type %qT undefined", basetype);
11407 error ("duplicate base type %qT invalid", basetype);
11411 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11412 /* Regenerate the pack expansion for the bases. */
11413 basetype = make_pack_expansion (basetype);
11415 TYPE_MARKED_P (basetype) = 1;
11417 base_binfo = copy_binfo (base_binfo, basetype, ref,
11418 &igo_prev, via_virtual);
11419 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11420 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11422 BINFO_BASE_APPEND (binfo, base_binfo);
11423 BINFO_BASE_ACCESS_APPEND (binfo, access);
11426 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11427 /* If we have space in the vbase vector, we must have shared at
11428 least one of them, and are therefore diamond shaped. */
11429 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11431 /* Unmark all the types. */
11432 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11433 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11434 TYPE_MARKED_P (ref) = 0;
11436 /* Now see if we have a repeated base type. */
11437 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11439 for (base_binfo = binfo; base_binfo;
11440 base_binfo = TREE_CHAIN (base_binfo))
11442 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11444 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11447 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11449 for (base_binfo = binfo; base_binfo;
11450 base_binfo = TREE_CHAIN (base_binfo))
11451 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11452 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11461 /* Copies the enum-related properties from type SRC to type DST.
11462 Used with the underlying type of an enum and the enum itself. */
11464 copy_type_enum (tree dst, tree src)
11466 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11467 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11468 TYPE_SIZE (dst) = TYPE_SIZE (src);
11469 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11470 SET_TYPE_MODE (dst, TYPE_MODE (src));
11471 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11472 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11473 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11474 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11477 /* Begin compiling the definition of an enumeration type.
11480 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11482 UNDERLYING_TYPE is the type that will be used as the storage for
11483 the enumeration type. This should be NULL_TREE if no storage type
11486 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11488 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11490 Returns the type object, as yet incomplete.
11491 Also records info about it so that build_enumerator
11492 may be used to declare the individual values as they are read. */
11495 start_enum (tree name, tree enumtype, tree underlying_type,
11496 bool scoped_enum_p, bool *is_new)
11498 tree prevtype = NULL_TREE;
11499 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11503 /* [C++0x dcl.enum]p5:
11505 If not explicitly specified, the underlying type of a scoped
11506 enumeration type is int. */
11507 if (!underlying_type && scoped_enum_p)
11508 underlying_type = integer_type_node;
11510 if (underlying_type)
11511 underlying_type = cv_unqualified (underlying_type);
11513 /* If this is the real definition for a previous forward reference,
11514 fill in the contents in the same object that used to be the
11515 forward reference. */
11517 enumtype = lookup_and_check_tag (enum_type, name,
11518 /*tag_scope=*/ts_current,
11519 /*template_header_p=*/false);
11521 /* In case of a template_decl, the only check that should be deferred
11522 to instantiation time is the comparison of underlying types. */
11523 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11525 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11527 error_at (input_location, "scoped/unscoped mismatch "
11528 "in enum %q#T", enumtype);
11529 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11530 "previous definition here");
11531 enumtype = error_mark_node;
11533 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11535 error_at (input_location, "underlying type mismatch "
11536 "in enum %q#T", enumtype);
11537 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11538 "previous definition here");
11539 enumtype = error_mark_node;
11541 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11542 && !dependent_type_p (underlying_type)
11543 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11544 && !same_type_p (underlying_type,
11545 ENUM_UNDERLYING_TYPE (enumtype)))
11547 error_at (input_location, "different underlying type "
11548 "in enum %q#T", enumtype);
11549 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11550 "previous definition here");
11551 underlying_type = NULL_TREE;
11555 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11556 || processing_template_decl)
11558 /* In case of error, make a dummy enum to allow parsing to
11560 if (enumtype == error_mark_node)
11562 name = make_anon_name ();
11563 enumtype = NULL_TREE;
11566 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11567 of an opaque enum, or an opaque enum of an already defined
11568 enumeration (C++0x only).
11569 In any other case, it'll be NULL_TREE. */
11575 prevtype = enumtype;
11576 enumtype = cxx_make_type (ENUMERAL_TYPE);
11577 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11578 if (enumtype == error_mark_node)
11579 return error_mark_node;
11581 /* The enum is considered opaque until the opening '{' of the
11582 enumerator list. */
11583 SET_OPAQUE_ENUM_P (enumtype, true);
11584 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11587 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11589 if (underlying_type)
11591 if (CP_INTEGRAL_TYPE_P (underlying_type))
11593 copy_type_enum (enumtype, underlying_type);
11594 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11596 else if (dependent_type_p (underlying_type))
11597 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11599 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11600 underlying_type, enumtype);
11603 /* If into a template class, the returned enum is always the first
11604 declaration (opaque or not) seen. This way all the references to
11605 this type will be to the same declaration. The following ones are used
11606 only to check for definition errors. */
11607 if (prevtype && processing_template_decl)
11613 /* After processing and defining all the values of an enumeration type,
11614 install their decls in the enumeration type.
11615 ENUMTYPE is the type object. */
11618 finish_enum_value_list (tree enumtype)
11621 tree underlying_type;
11624 tree minnode, maxnode;
11627 bool fixed_underlying_type_p
11628 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11630 /* We built up the VALUES in reverse order. */
11631 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11633 /* For an enum defined in a template, just set the type of the values;
11634 all further processing is postponed until the template is
11635 instantiated. We need to set the type so that tsubst of a CONST_DECL
11637 if (processing_template_decl)
11639 for (values = TYPE_VALUES (enumtype);
11641 values = TREE_CHAIN (values))
11642 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11646 /* Determine the minimum and maximum values of the enumerators. */
11647 if (TYPE_VALUES (enumtype))
11649 minnode = maxnode = NULL_TREE;
11651 for (values = TYPE_VALUES (enumtype);
11653 values = TREE_CHAIN (values))
11655 decl = TREE_VALUE (values);
11657 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11658 each enumerator has the type of its enumeration. Prior to the
11659 closing brace, the type of each enumerator is the type of its
11660 initializing value. */
11661 TREE_TYPE (decl) = enumtype;
11663 /* Update the minimum and maximum values, if appropriate. */
11664 value = DECL_INITIAL (decl);
11665 if (value == error_mark_node)
11666 value = integer_zero_node;
11667 /* Figure out what the minimum and maximum values of the
11668 enumerators are. */
11670 minnode = maxnode = value;
11671 else if (tree_int_cst_lt (maxnode, value))
11673 else if (tree_int_cst_lt (value, minnode))
11680 If the enumerator-list is empty, the underlying type is as if
11681 the enumeration had a single enumerator with value 0. */
11682 minnode = maxnode = integer_zero_node;
11684 if (!fixed_underlying_type_p)
11686 /* Compute the number of bits require to represent all values of the
11687 enumeration. We must do this before the type of MINNODE and
11688 MAXNODE are transformed, since tree_int_cst_min_precision relies
11689 on the TREE_TYPE of the value it is passed. */
11690 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11691 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11692 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11693 int precision = MAX (lowprec, highprec);
11695 bool use_short_enum;
11697 /* Determine the underlying type of the enumeration.
11701 The underlying type of an enumeration is an integral type that
11702 can represent all the enumerator values defined in the
11703 enumeration. It is implementation-defined which integral type is
11704 used as the underlying type for an enumeration except that the
11705 underlying type shall not be larger than int unless the value of
11706 an enumerator cannot fit in an int or unsigned int.
11708 We use "int" or an "unsigned int" as the underlying type, even if
11709 a smaller integral type would work, unless the user has
11710 explicitly requested that we use the smallest possible type. The
11711 user can request that for all enumerations with a command line
11712 flag, or for just one enumeration with an attribute. */
11714 use_short_enum = flag_short_enums
11715 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11717 for (itk = (use_short_enum ? itk_char : itk_int);
11721 underlying_type = integer_types[itk];
11722 if (underlying_type != NULL_TREE
11723 && TYPE_PRECISION (underlying_type) >= precision
11724 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11727 if (itk == itk_none)
11731 IF no integral type can represent all the enumerator values, the
11732 enumeration is ill-formed. */
11733 error ("no integral type can represent all of the enumerator values "
11734 "for %qT", enumtype);
11735 precision = TYPE_PRECISION (long_long_integer_type_node);
11736 underlying_type = integer_types[itk_unsigned_long_long];
11741 The value of sizeof() applied to an enumeration type, an object
11742 of an enumeration type, or an enumerator, is the value of sizeof()
11743 applied to the underlying type. */
11744 copy_type_enum (enumtype, underlying_type);
11746 /* Compute the minimum and maximum values for the type.
11750 For an enumeration where emin is the smallest enumerator and emax
11751 is the largest, the values of the enumeration are the values of the
11752 underlying type in the range bmin to bmax, where bmin and bmax are,
11753 respectively, the smallest and largest values of the smallest bit-
11754 field that can store emin and emax. */
11756 /* The middle-end currently assumes that types with TYPE_PRECISION
11757 narrower than their underlying type are suitably zero or sign
11758 extended to fill their mode. Similarly, it assumes that the front
11759 end assures that a value of a particular type must be within
11760 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11762 We used to set these fields based on bmin and bmax, but that led
11763 to invalid assumptions like optimizing away bounds checking. So
11764 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11765 TYPE_MAX_VALUE to the values for the mode above and only restrict
11766 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11767 ENUM_UNDERLYING_TYPE (enumtype)
11768 = build_distinct_type_copy (underlying_type);
11769 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11770 set_min_and_max_values_for_integral_type
11771 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11773 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11774 if (flag_strict_enums)
11775 set_min_and_max_values_for_integral_type (enumtype, precision,
11779 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11781 /* Convert each of the enumerators to the type of the underlying
11782 type of the enumeration. */
11783 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11785 location_t saved_location;
11787 decl = TREE_VALUE (values);
11788 saved_location = input_location;
11789 input_location = DECL_SOURCE_LOCATION (decl);
11790 if (fixed_underlying_type_p)
11791 /* If the enumeration type has a fixed underlying type, we
11792 already checked all of the enumerator values. */
11793 value = DECL_INITIAL (decl);
11795 value = perform_implicit_conversion (underlying_type,
11796 DECL_INITIAL (decl),
11797 tf_warning_or_error);
11798 input_location = saved_location;
11800 /* Do not clobber shared ints. */
11801 value = copy_node (value);
11803 TREE_TYPE (value) = enumtype;
11804 DECL_INITIAL (decl) = value;
11807 /* Fix up all variant types of this enum type. */
11808 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11809 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11811 /* Finish debugging output for this type. */
11812 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11815 /* Finishes the enum type. This is called only the first time an
11816 enumeration is seen, be it opaque or odinary.
11817 ENUMTYPE is the type object. */
11820 finish_enum (tree enumtype)
11822 if (processing_template_decl)
11824 if (at_function_scope_p ())
11825 add_stmt (build_min (TAG_DEFN, enumtype));
11829 /* Here there should not be any variants of this type. */
11830 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11831 && !TYPE_NEXT_VARIANT (enumtype));
11834 /* Build and install a CONST_DECL for an enumeration constant of the
11835 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11836 LOC is the location of NAME.
11837 Assignment of sequential values by default is handled here. */
11840 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11846 /* If the VALUE was erroneous, pretend it wasn't there; that will
11847 result in the enum being assigned the next value in sequence. */
11848 if (value == error_mark_node)
11851 /* Remove no-op casts from the value. */
11853 STRIP_TYPE_NOPS (value);
11855 if (! processing_template_decl)
11857 /* Validate and default VALUE. */
11858 if (value != NULL_TREE)
11860 value = cxx_constant_value (value);
11862 if (TREE_CODE (value) == INTEGER_CST)
11864 value = perform_integral_promotions (value);
11868 error ("enumerator value for %qD is not an integer constant", name);
11873 /* Default based on previous value. */
11874 if (value == NULL_TREE)
11876 if (TYPE_VALUES (enumtype))
11879 unsigned HOST_WIDE_INT lo;
11883 /* The next value is the previous value plus one.
11884 add_double doesn't know the type of the target expression,
11885 so we must check with int_fits_type_p as well. */
11886 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11887 if (error_operand_p (prev_value))
11888 value = error_mark_node;
11891 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11892 TREE_INT_CST_HIGH (prev_value),
11894 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11896 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11900 error ("overflow in enumeration values at %qD", name);
11901 value = error_mark_node;
11906 value = integer_zero_node;
11909 /* Remove no-op casts from the value. */
11910 STRIP_TYPE_NOPS (value);
11912 /* If the underlying type of the enum is fixed, check whether
11913 the enumerator values fits in the underlying type. If it
11914 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11915 if (ENUM_UNDERLYING_TYPE (enumtype)
11917 && TREE_CODE (value) == INTEGER_CST
11918 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11920 error ("enumerator value %E is too large for underlying type %<%T%>",
11921 value, ENUM_UNDERLYING_TYPE (enumtype));
11923 /* Silently convert the value so that we can continue. */
11924 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11929 /* C++ associates enums with global, function, or class declarations. */
11930 context = current_scope ();
11932 /* Build the actual enumeration constant. Note that the enumeration
11933 constants have the underlying type of the enum (if it is fixed)
11934 or the type of their initializer (if the underlying type of the
11935 enum is not fixed):
11939 If the underlying type is fixed, the type of each enumerator
11940 prior to the closing brace is the underlying type; if the
11941 initializing value of an enumerator cannot be represented by
11942 the underlying type, the program is ill-formed. If the
11943 underlying type is not fixed, the type of each enumerator is
11944 the type of its initializing value.
11946 If the underlying type is not fixed, it will be computed by
11947 finish_enum and we will reset the type of this enumerator. Of
11948 course, if we're processing a template, there may be no value. */
11949 type = value ? TREE_TYPE (value) : NULL_TREE;
11951 if (context && context == current_class_type)
11952 /* This enum declaration is local to the class. We need the full
11953 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11954 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11956 /* It's a global enum, or it's local to a function. (Note local to
11957 a function could mean local to a class method. */
11958 decl = build_decl (loc, CONST_DECL, name, type);
11960 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11961 TREE_CONSTANT (decl) = 1;
11962 TREE_READONLY (decl) = 1;
11963 DECL_INITIAL (decl) = value;
11965 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11966 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11967 on the TYPE_FIELDS list for `S'. (That's so that you can say
11968 things like `S::i' later.) */
11969 finish_member_declaration (decl);
11973 /* Add this enumeration constant to the list for this type. */
11974 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11977 /* Look for an enumerator with the given NAME within the enumeration
11978 type ENUMTYPE. This routine is used primarily for qualified name
11979 lookup into an enumerator in C++0x, e.g.,
11981 enum class Color { Red, Green, Blue };
11983 Color color = Color::Red;
11985 Returns the value corresponding to the enumerator, or
11986 NULL_TREE if no such enumerator was found. */
11988 lookup_enumerator (tree enumtype, tree name)
11991 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11993 e = purpose_member (name, TYPE_VALUES (enumtype));
11994 return e? TREE_VALUE (e) : NULL_TREE;
11998 /* We're defining DECL. Make sure that its type is OK. */
12001 check_function_type (tree decl, tree current_function_parms)
12003 tree fntype = TREE_TYPE (decl);
12004 tree return_type = complete_type (TREE_TYPE (fntype));
12006 /* In a function definition, arg types must be complete. */
12007 require_complete_types_for_parms (current_function_parms);
12009 if (dependent_type_p (return_type))
12011 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12012 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12014 tree args = TYPE_ARG_TYPES (fntype);
12016 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12017 error ("return type %q#T is incomplete", return_type);
12019 error ("return type has Java class type %q#T", return_type);
12021 /* Make it return void instead. */
12022 if (TREE_CODE (fntype) == METHOD_TYPE)
12023 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12025 TREE_CHAIN (args));
12027 fntype = build_function_type (void_type_node, args);
12029 = build_exception_variant (fntype,
12030 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12031 fntype = (cp_build_type_attribute_variant
12032 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12033 TREE_TYPE (decl) = fntype;
12036 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12039 /* Create the FUNCTION_DECL for a function definition.
12040 DECLSPECS and DECLARATOR are the parts of the declaration;
12041 they describe the function's name and the type it returns,
12042 but twisted together in a fashion that parallels the syntax of C.
12044 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12045 DECLARATOR is really the DECL for the function we are about to
12046 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12047 indicating that the function is an inline defined in-class.
12049 This function creates a binding context for the function body
12050 as well as setting up the FUNCTION_DECL in current_function_decl.
12052 For C++, we must first check whether that datum makes any sense.
12053 For example, "class A local_a(1,2);" means that variable local_a
12054 is an aggregate of type A, which should have a constructor
12055 applied to it with the argument list [1, 2].
12057 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12058 or may be a BLOCK if the function has been defined previously
12059 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12060 error_mark_node if the function has never been defined, or
12061 a BLOCK if the function has been defined somewhere. */
12064 start_preparsed_function (tree decl1, tree attrs, int flags)
12066 tree ctype = NULL_TREE;
12069 int doing_friend = 0;
12070 struct cp_binding_level *bl;
12071 tree current_function_parms;
12072 struct c_fileinfo *finfo
12073 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12074 bool honor_interface;
12076 /* Sanity check. */
12077 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12078 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12080 fntype = TREE_TYPE (decl1);
12081 if (TREE_CODE (fntype) == METHOD_TYPE)
12082 ctype = TYPE_METHOD_BASETYPE (fntype);
12084 /* ISO C++ 11.4/5. A friend function defined in a class is in
12085 the (lexical) scope of the class in which it is defined. */
12086 if (!ctype && DECL_FRIEND_P (decl1))
12088 ctype = DECL_FRIEND_CONTEXT (decl1);
12090 /* CTYPE could be null here if we're dealing with a template;
12091 for example, `inline friend float foo()' inside a template
12092 will have no CTYPE set. */
12093 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12099 if (DECL_DECLARED_INLINE_P (decl1)
12100 && lookup_attribute ("noinline", attrs))
12101 warning (0, "inline function %q+D given attribute noinline", decl1);
12103 /* Handle gnu_inline attribute. */
12104 if (GNU_INLINE_P (decl1))
12106 DECL_EXTERNAL (decl1) = 1;
12107 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12108 DECL_INTERFACE_KNOWN (decl1) = 1;
12109 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12112 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12113 /* This is a constructor, we must ensure that any default args
12114 introduced by this definition are propagated to the clones
12115 now. The clones are used directly in overload resolution. */
12116 adjust_clone_args (decl1);
12118 /* Sometimes we don't notice that a function is a static member, and
12119 build a METHOD_TYPE for it. Fix that up now. */
12120 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12121 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12123 revert_static_member_fn (decl1);
12127 /* Set up current_class_type, and enter the scope of the class, if
12130 push_nested_class (ctype);
12131 else if (DECL_STATIC_FUNCTION_P (decl1))
12132 push_nested_class (DECL_CONTEXT (decl1));
12134 /* Now that we have entered the scope of the class, we must restore
12135 the bindings for any template parameters surrounding DECL1, if it
12136 is an inline member template. (Order is important; consider the
12137 case where a template parameter has the same name as a field of
12138 the class.) It is not until after this point that
12139 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12140 if (flags & SF_INCLASS_INLINE)
12141 maybe_begin_member_template_processing (decl1);
12143 /* Effective C++ rule 15. */
12145 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12146 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12147 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12149 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12150 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12151 if (!DECL_INITIAL (decl1))
12152 DECL_INITIAL (decl1) = error_mark_node;
12154 /* This function exists in static storage.
12155 (This does not mean `static' in the C sense!) */
12156 TREE_STATIC (decl1) = 1;
12158 /* We must call push_template_decl after current_class_type is set
12159 up. (If we are processing inline definitions after exiting a
12160 class scope, current_class_type will be NULL_TREE until set above
12161 by push_nested_class.) */
12162 if (processing_template_decl)
12164 /* FIXME: Handle error_mark_node more gracefully. */
12165 tree newdecl1 = push_template_decl (decl1);
12166 if (newdecl1 != error_mark_node)
12170 /* We are now in the scope of the function being defined. */
12171 current_function_decl = decl1;
12173 /* Save the parm names or decls from this function's declarator
12174 where store_parm_decls will find them. */
12175 current_function_parms = DECL_ARGUMENTS (decl1);
12177 /* Make sure the parameter and return types are reasonable. When
12178 you declare a function, these types can be incomplete, but they
12179 must be complete when you define the function. */
12180 check_function_type (decl1, current_function_parms);
12182 /* Build the return declaration for the function. */
12183 restype = TREE_TYPE (fntype);
12184 if (DECL_RESULT (decl1) == NULL_TREE)
12188 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12189 DECL_ARTIFICIAL (resdecl) = 1;
12190 DECL_IGNORED_P (resdecl) = 1;
12191 DECL_RESULT (decl1) = resdecl;
12193 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12196 /* Let the user know we're compiling this function. */
12197 announce_function (decl1);
12199 /* Record the decl so that the function name is defined.
12200 If we already have a decl for this name, and it is a FUNCTION_DECL,
12201 use the old decl. */
12202 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12204 /* A specialization is not used to guide overload resolution. */
12205 if (!DECL_FUNCTION_MEMBER_P (decl1)
12206 && !(DECL_USE_TEMPLATE (decl1) &&
12207 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12209 tree olddecl = pushdecl (decl1);
12211 if (olddecl == error_mark_node)
12212 /* If something went wrong when registering the declaration,
12213 use DECL1; we have to have a FUNCTION_DECL to use when
12214 parsing the body of the function. */
12218 /* Otherwise, OLDDECL is either a previous declaration
12219 of the same function or DECL1 itself. */
12221 if (warn_missing_declarations
12222 && olddecl == decl1
12223 && !DECL_MAIN_P (decl1)
12224 && TREE_PUBLIC (decl1)
12225 && !DECL_DECLARED_INLINE_P (decl1))
12229 /* Check whether DECL1 is in an anonymous
12231 for (context = DECL_CONTEXT (decl1);
12233 context = DECL_CONTEXT (context))
12235 if (TREE_CODE (context) == NAMESPACE_DECL
12236 && DECL_NAME (context) == NULL_TREE)
12240 if (context == NULL)
12241 warning (OPT_Wmissing_declarations,
12242 "no previous declaration for %q+D", decl1);
12250 /* We need to set the DECL_CONTEXT. */
12251 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12252 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12254 fntype = TREE_TYPE (decl1);
12256 /* If #pragma weak applies, mark the decl appropriately now.
12257 The pragma only applies to global functions. Because
12258 determining whether or not the #pragma applies involves
12259 computing the mangled name for the declaration, we cannot
12260 apply the pragma until after we have merged this declaration
12261 with any previous declarations; if the original declaration
12262 has a linkage specification, that specification applies to
12263 the definition as well, and may affect the mangled name. */
12264 if (DECL_FILE_SCOPE_P (decl1))
12265 maybe_apply_pragma_weak (decl1);
12268 /* constexpr functions must have literal argument types and
12269 literal return type. */
12270 validate_constexpr_fundecl (decl1);
12272 /* Reset this in case the call to pushdecl changed it. */
12273 current_function_decl = decl1;
12275 gcc_assert (DECL_INITIAL (decl1));
12277 /* This function may already have been parsed, in which case just
12278 return; our caller will skip over the body without parsing. */
12279 if (DECL_INITIAL (decl1) != error_mark_node)
12282 /* Initialize RTL machinery. We cannot do this until
12283 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12284 even when processing a template; this is how we get
12285 CFUN set up, and our per-function variables initialized.
12286 FIXME factor out the non-RTL stuff. */
12287 bl = current_binding_level;
12288 allocate_struct_function (decl1, processing_template_decl);
12290 /* Initialize the language data structures. Whenever we start
12291 a new function, we destroy temporaries in the usual way. */
12292 cfun->language = ggc_alloc_cleared_language_function ();
12293 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12294 current_binding_level = bl;
12296 /* Even though we're inside a function body, we still don't want to
12297 call expand_expr to calculate the size of a variable-sized array.
12298 We haven't necessarily assigned RTL to all variables yet, so it's
12299 not safe to try to expand expressions involving them. */
12300 cfun->dont_save_pending_sizes_p = 1;
12302 /* Start the statement-tree, start the tree now. */
12303 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12305 /* If we are (erroneously) defining a function that we have already
12306 defined before, wipe out what we knew before. */
12307 if (!DECL_PENDING_INLINE_P (decl1))
12308 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12310 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12312 /* We know that this was set up by `grokclassfn'. We do not
12313 wait until `store_parm_decls', since evil parse errors may
12314 never get us to that point. Here we keep the consistency
12315 between `current_class_type' and `current_class_ptr'. */
12316 tree t = DECL_ARGUMENTS (decl1);
12318 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12319 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12321 cp_function_chain->x_current_class_ref
12322 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12323 cp_function_chain->x_current_class_ptr = t;
12325 /* Constructors and destructors need to know whether they're "in
12326 charge" of initializing virtual base classes. */
12327 t = DECL_CHAIN (t);
12328 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12330 current_in_charge_parm = t;
12331 t = DECL_CHAIN (t);
12333 if (DECL_HAS_VTT_PARM_P (decl1))
12335 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12336 current_vtt_parm = t;
12340 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12341 /* Implicitly-defined methods (like the
12342 destructor for a class in which no destructor
12343 is explicitly declared) must not be defined
12344 until their definition is needed. So, we
12345 ignore interface specifications for
12346 compiler-generated functions. */
12347 && !DECL_ARTIFICIAL (decl1));
12349 if (DECL_INTERFACE_KNOWN (decl1))
12351 tree ctx = decl_function_context (decl1);
12353 if (DECL_NOT_REALLY_EXTERN (decl1))
12354 DECL_EXTERNAL (decl1) = 0;
12356 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12357 && TREE_PUBLIC (ctx))
12358 /* This is a function in a local class in an extern inline
12360 comdat_linkage (decl1);
12362 /* If this function belongs to an interface, it is public.
12363 If it belongs to someone else's interface, it is also external.
12364 This only affects inlines and template instantiations. */
12365 else if (!finfo->interface_unknown && honor_interface)
12367 if (DECL_DECLARED_INLINE_P (decl1)
12368 || DECL_TEMPLATE_INSTANTIATION (decl1)
12369 || processing_template_decl)
12371 DECL_EXTERNAL (decl1)
12372 = (finfo->interface_only
12373 || (DECL_DECLARED_INLINE_P (decl1)
12374 && ! flag_implement_inlines
12375 && !DECL_VINDEX (decl1)));
12377 /* For WIN32 we also want to put these in linkonce sections. */
12378 maybe_make_one_only (decl1);
12381 DECL_EXTERNAL (decl1) = 0;
12382 DECL_INTERFACE_KNOWN (decl1) = 1;
12383 /* If this function is in an interface implemented in this file,
12384 make sure that the back end knows to emit this function
12386 if (!DECL_EXTERNAL (decl1))
12387 mark_needed (decl1);
12389 else if (finfo->interface_unknown && finfo->interface_only
12390 && honor_interface)
12392 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12393 interface, we will have both finfo->interface_unknown and
12394 finfo->interface_only set. In that case, we don't want to
12395 use the normal heuristics because someone will supply a
12396 #pragma implementation elsewhere, and deducing it here would
12397 produce a conflict. */
12398 comdat_linkage (decl1);
12399 DECL_EXTERNAL (decl1) = 0;
12400 DECL_INTERFACE_KNOWN (decl1) = 1;
12401 DECL_DEFER_OUTPUT (decl1) = 1;
12405 /* This is a definition, not a reference.
12406 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12407 if (!GNU_INLINE_P (decl1))
12408 DECL_EXTERNAL (decl1) = 0;
12410 if ((DECL_DECLARED_INLINE_P (decl1)
12411 || DECL_TEMPLATE_INSTANTIATION (decl1))
12412 && ! DECL_INTERFACE_KNOWN (decl1))
12413 DECL_DEFER_OUTPUT (decl1) = 1;
12415 DECL_INTERFACE_KNOWN (decl1) = 1;
12418 /* Determine the ELF visibility attribute for the function. We must not
12419 do this before calling "pushdecl", as we must allow "duplicate_decls"
12420 to merge any attributes appropriately. We also need to wait until
12422 if (!DECL_CLONED_FUNCTION_P (decl1))
12423 determine_visibility (decl1);
12425 begin_scope (sk_function_parms, decl1);
12429 if (DECL_DESTRUCTOR_P (decl1)
12430 || (DECL_CONSTRUCTOR_P (decl1)
12431 && targetm.cxx.cdtor_returns_this ()))
12433 cdtor_label = build_decl (input_location,
12434 LABEL_DECL, NULL_TREE, NULL_TREE);
12435 DECL_CONTEXT (cdtor_label) = current_function_decl;
12438 start_fname_decls ();
12440 store_parm_decls (current_function_parms);
12444 /* Like start_preparsed_function, except that instead of a
12445 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12447 Returns 1 on success. If the DECLARATOR is not suitable for a function
12448 (it defines a datum instead), we return 0, which tells
12449 yyparse to report a parse error. */
12452 start_function (cp_decl_specifier_seq *declspecs,
12453 const cp_declarator *declarator,
12458 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12459 if (decl1 == error_mark_node)
12461 /* If the declarator is not suitable for a function definition,
12462 cause a syntax error. */
12463 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12465 error ("invalid function declaration");
12469 if (DECL_MAIN_P (decl1))
12470 /* main must return int. grokfndecl should have corrected it
12471 (and issued a diagnostic) if the user got it wrong. */
12472 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12473 integer_type_node));
12475 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12480 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12484 use_eh_spec_block (tree fn)
12486 return (flag_exceptions && flag_enforce_eh_specs
12487 && !processing_template_decl
12488 && !type_throw_all_p (TREE_TYPE (fn))
12489 /* We insert the EH_SPEC_BLOCK only in the original
12490 function; then, it is copied automatically to the
12492 && !DECL_CLONED_FUNCTION_P (fn)
12493 /* Implicitly-generated constructors and destructors have
12494 exception specifications. However, those specifications
12495 are the union of the possible exceptions specified by the
12496 constructors/destructors for bases and members, so no
12497 unallowed exception will ever reach this function. By
12498 not creating the EH_SPEC_BLOCK we save a little memory,
12499 and we avoid spurious warnings about unreachable
12501 && !DECL_ARTIFICIAL (fn));
12504 /* Store the parameter declarations into the current function declaration.
12505 This is called after parsing the parameter declarations, before
12506 digesting the body of the function.
12508 Also install to binding contour return value identifier, if any. */
12511 store_parm_decls (tree current_function_parms)
12513 tree fndecl = current_function_decl;
12516 /* This is a chain of any other decls that came in among the parm
12517 declarations. If a parm is declared with enum {foo, bar} x;
12518 then CONST_DECLs for foo and bar are put here. */
12519 tree nonparms = NULL_TREE;
12521 if (current_function_parms)
12523 /* This case is when the function was defined with an ANSI prototype.
12524 The parms already have decls, so we need not do anything here
12525 except record them as in effect
12526 and complain if any redundant old-style parm decls were written. */
12528 tree specparms = current_function_parms;
12531 /* Must clear this because it might contain TYPE_DECLs declared
12533 current_binding_level->names = NULL;
12535 /* If we're doing semantic analysis, then we'll call pushdecl
12536 for each of these. We must do them in reverse order so that
12537 they end in the correct forward order. */
12538 specparms = nreverse (specparms);
12540 for (parm = specparms; parm; parm = next)
12542 next = DECL_CHAIN (parm);
12543 if (TREE_CODE (parm) == PARM_DECL)
12545 if (DECL_NAME (parm) == NULL_TREE
12546 || TREE_CODE (parm) != VOID_TYPE)
12549 error ("parameter %qD declared void", parm);
12553 /* If we find an enum constant or a type tag,
12554 put it aside for the moment. */
12555 TREE_CHAIN (parm) = NULL_TREE;
12556 nonparms = chainon (nonparms, parm);
12560 /* Get the decls in their original chain order and record in the
12561 function. This is all and only the PARM_DECLs that were
12562 pushed into scope by the loop above. */
12563 DECL_ARGUMENTS (fndecl) = getdecls ();
12566 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12568 /* Now store the final chain of decls for the arguments
12569 as the decl-chain of the current lexical scope.
12570 Put the enumerators in as well, at the front so that
12571 DECL_ARGUMENTS is not modified. */
12572 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12574 if (use_eh_spec_block (current_function_decl))
12575 current_eh_spec_block = begin_eh_spec_block ();
12579 /* We have finished doing semantic analysis on DECL, but have not yet
12580 generated RTL for its body. Save away our current state, so that
12581 when we want to generate RTL later we know what to do. */
12584 save_function_data (tree decl)
12586 struct language_function *f;
12588 /* Save the language-specific per-function data so that we can
12589 get it back when we really expand this function. */
12590 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12593 f = ggc_alloc_language_function ();
12594 memcpy (f, cp_function_chain, sizeof (struct language_function));
12595 DECL_SAVED_FUNCTION_DATA (decl) = f;
12597 /* Clear out the bits we don't need. */
12598 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12599 f->bindings = NULL;
12600 f->x_local_names = NULL;
12604 /* Set the return value of the constructor (if present). */
12607 finish_constructor_body (void)
12612 if (targetm.cxx.cdtor_returns_this ()
12613 && (! TYPE_FOR_JAVA (current_class_type)))
12615 /* Any return from a constructor will end up here. */
12616 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12618 val = DECL_ARGUMENTS (current_function_decl);
12619 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12620 DECL_RESULT (current_function_decl), val);
12621 /* Return the address of the object. */
12622 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12623 add_stmt (exprstmt);
12627 /* Do all the processing for the beginning of a destructor; set up the
12628 vtable pointers and cleanups for bases and members. */
12631 begin_destructor_body (void)
12633 tree compound_stmt;
12635 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12636 issued an error message. We still want to try to process the
12637 body of the function, but initialize_vtbl_ptrs will crash if
12638 TYPE_BINFO is NULL. */
12639 if (COMPLETE_TYPE_P (current_class_type))
12641 compound_stmt = begin_compound_stmt (0);
12642 /* Make all virtual function table pointers in non-virtual base
12643 classes point to CURRENT_CLASS_TYPE's virtual function
12645 initialize_vtbl_ptrs (current_class_ptr);
12646 finish_compound_stmt (compound_stmt);
12648 /* And insert cleanups for our bases and members so that they
12649 will be properly destroyed if we throw. */
12650 push_base_cleanups ();
12654 /* At the end of every destructor we generate code to delete the object if
12655 necessary. Do that now. */
12658 finish_destructor_body (void)
12662 /* Any return from a destructor will end up here; that way all base
12663 and member cleanups will be run when the function returns. */
12664 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12666 /* In a virtual destructor, we must call delete. */
12667 if (DECL_VIRTUAL_P (current_function_decl))
12670 tree virtual_size = cxx_sizeof (current_class_type);
12674 At the point of definition of a virtual destructor (including
12675 an implicit definition), non-placement operator delete shall
12676 be looked up in the scope of the destructor's class and if
12677 found shall be accessible and unambiguous. */
12678 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12680 /*global_p=*/false,
12681 /*placement=*/NULL_TREE,
12682 /*alloc_fn=*/NULL_TREE);
12684 if_stmt = begin_if_stmt ();
12685 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12686 current_in_charge_parm,
12689 finish_expr_stmt (exprstmt);
12690 finish_then_clause (if_stmt);
12691 finish_if_stmt (if_stmt);
12694 if (targetm.cxx.cdtor_returns_this ())
12698 val = DECL_ARGUMENTS (current_function_decl);
12699 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12700 DECL_RESULT (current_function_decl), val);
12701 /* Return the address of the object. */
12702 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12703 add_stmt (exprstmt);
12707 /* Do the necessary processing for the beginning of a function body, which
12708 in this case includes member-initializers, but not the catch clauses of
12709 a function-try-block. Currently, this means opening a binding level
12710 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12713 begin_function_body (void)
12717 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12720 if (processing_template_decl)
12721 /* Do nothing now. */;
12723 /* Always keep the BLOCK node associated with the outermost pair of
12724 curly braces of a function. These are needed for correct
12725 operation of dwarfout.c. */
12726 keep_next_level (true);
12728 stmt = begin_compound_stmt (BCS_FN_BODY);
12730 if (processing_template_decl)
12731 /* Do nothing now. */;
12732 else if (DECL_DESTRUCTOR_P (current_function_decl))
12733 begin_destructor_body ();
12738 /* Do the processing for the end of a function body. Currently, this means
12739 closing out the cleanups for fully-constructed bases and members, and in
12740 the case of the destructor, deleting the object if desired. Again, this
12741 is only meaningful for [cd]tors, since they are the only functions where
12742 there is a significant distinction between the main body and any
12743 function catch clauses. Handling, say, main() return semantics here
12744 would be wrong, as flowing off the end of a function catch clause for
12745 main() would also need to return 0. */
12748 finish_function_body (tree compstmt)
12750 if (compstmt == NULL_TREE)
12753 /* Close the block. */
12754 finish_compound_stmt (compstmt);
12756 if (processing_template_decl)
12757 /* Do nothing now. */;
12758 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12759 finish_constructor_body ();
12760 else if (DECL_DESTRUCTOR_P (current_function_decl))
12761 finish_destructor_body ();
12764 /* Given a function, returns the BLOCK corresponding to the outermost level
12765 of curly braces, skipping the artificial block created for constructor
12769 outer_curly_brace_block (tree fndecl)
12771 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12772 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12773 /* Skip the artificial function body block. */
12774 block = BLOCK_SUBBLOCKS (block);
12778 /* If FNDECL is a class's key method, add the class to the list of
12779 keyed classes that should be emitted. */
12782 record_key_method_defined (tree fndecl)
12784 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12785 && DECL_VIRTUAL_P (fndecl)
12786 && !processing_template_decl)
12788 tree fnclass = DECL_CONTEXT (fndecl);
12789 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12790 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12794 /* Subroutine of finish_function.
12795 Save the body of constexpr functions for possible
12796 future compile time evaluation. */
12799 maybe_save_function_definition (tree fun)
12801 if (!processing_template_decl
12802 && DECL_DECLARED_CONSTEXPR_P (fun)
12803 && !DECL_CLONED_FUNCTION_P (fun))
12804 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12807 /* Finish up a function declaration and compile that function
12808 all the way to assembler language output. The free the storage
12809 for the function definition.
12811 FLAGS is a bitwise or of the following values:
12813 We just finished processing the body of an in-class inline
12814 function definition. (This processing will have taken place
12815 after the class definition is complete.) */
12818 finish_function (int flags)
12820 tree fndecl = current_function_decl;
12821 tree fntype, ctype = NULL_TREE;
12822 int inclass_inline = (flags & 2) != 0;
12824 /* When we get some parse errors, we can end up without a
12825 current_function_decl, so cope. */
12826 if (fndecl == NULL_TREE)
12827 return error_mark_node;
12829 if (c_dialect_objc ())
12830 objc_finish_function ();
12832 gcc_assert (!defer_mark_used_calls);
12833 defer_mark_used_calls = true;
12835 record_key_method_defined (fndecl);
12837 fntype = TREE_TYPE (fndecl);
12839 /* TREE_READONLY (fndecl) = 1;
12840 This caused &foo to be of type ptr-to-const-function
12841 which then got a warning when stored in a ptr-to-function variable. */
12843 gcc_assert (building_stmt_tree ());
12844 /* The current function is being defined, so its DECL_INITIAL should
12845 be set, and unless there's a multiple definition, it should be
12846 error_mark_node. */
12847 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12849 /* For a cloned function, we've already got all the code we need;
12850 there's no need to add any extra bits. */
12851 if (!DECL_CLONED_FUNCTION_P (fndecl))
12853 if (DECL_MAIN_P (current_function_decl))
12857 /* Make it so that `main' always returns 0 by default (or
12860 stmt = finish_return_stmt (integer_one_node);
12862 stmt = finish_return_stmt (integer_zero_node);
12864 /* Hack. We don't want the middle-end to warn that this
12865 return is unreachable, so put the statement on the
12868 location_t linezero = linemap_line_start (line_table, 0, 1);
12869 SET_EXPR_LOCATION (stmt, linezero);
12873 if (use_eh_spec_block (current_function_decl))
12874 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12875 (TREE_TYPE (current_function_decl)),
12876 current_eh_spec_block);
12879 /* If we're saving up tree structure, tie off the function now. */
12880 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12882 finish_fname_decls ();
12884 /* If this function can't throw any exceptions, remember that. */
12885 if (!processing_template_decl
12886 && !cp_function_chain->can_throw
12887 && !flag_non_call_exceptions
12888 && !decl_replaceable_p (fndecl))
12889 TREE_NOTHROW (fndecl) = 1;
12891 /* This must come after expand_function_end because cleanups might
12892 have declarations (from inline functions) that need to go into
12893 this function's blocks. */
12895 /* If the current binding level isn't the outermost binding level
12896 for this function, either there is a bug, or we have experienced
12897 syntax errors and the statement tree is malformed. */
12898 if (current_binding_level->kind != sk_function_parms)
12900 /* Make sure we have already experienced errors. */
12901 gcc_assert (errorcount);
12903 /* Throw away the broken statement tree and extra binding
12905 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12907 while (current_binding_level->kind != sk_function_parms)
12909 if (current_binding_level->kind == sk_class)
12910 pop_nested_class ();
12912 poplevel (0, 0, 0);
12915 poplevel (1, 0, 1);
12917 /* Statements should always be full-expressions at the outermost set
12918 of curly braces for a function. */
12919 gcc_assert (stmts_are_full_exprs_p ());
12921 /* Save constexpr function body before it gets munged by
12922 the NRV transformation. */
12923 maybe_save_function_definition (fndecl);
12925 /* Set up the named return value optimization, if we can. Candidate
12926 variables are selected in check_return_expr. */
12927 if (current_function_return_value)
12929 tree r = current_function_return_value;
12932 if (r != error_mark_node
12933 /* This is only worth doing for fns that return in memory--and
12934 simpler, since we don't have to worry about promoted modes. */
12935 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12936 /* Only allow this for variables declared in the outer scope of
12937 the function so we know that their lifetime always ends with a
12938 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12939 we were to do this optimization in tree-ssa. */
12940 && (outer = outer_curly_brace_block (fndecl))
12941 && chain_member (r, BLOCK_VARS (outer)))
12942 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12944 current_function_return_value = NULL_TREE;
12947 /* Remember that we were in class scope. */
12948 if (current_class_name)
12949 ctype = current_class_type;
12951 /* Must mark the RESULT_DECL as being in this function. */
12952 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12954 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12955 to the FUNCTION_DECL node itself. */
12956 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12958 /* Save away current state, if appropriate. */
12959 if (!processing_template_decl)
12960 save_function_data (fndecl);
12962 /* Complain if there's just no return statement. */
12963 if (warn_return_type
12964 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12965 && !dependent_type_p (TREE_TYPE (fntype))
12966 && !current_function_returns_value && !current_function_returns_null
12967 /* Don't complain if we abort or throw. */
12968 && !current_function_returns_abnormally
12969 /* Don't complain if we are declared noreturn. */
12970 && !TREE_THIS_VOLATILE (fndecl)
12971 && !DECL_NAME (DECL_RESULT (fndecl))
12972 && !TREE_NO_WARNING (fndecl)
12973 /* Structor return values (if any) are set by the compiler. */
12974 && !DECL_CONSTRUCTOR_P (fndecl)
12975 && !DECL_DESTRUCTOR_P (fndecl))
12977 warning (OPT_Wreturn_type,
12978 "no return statement in function returning non-void");
12979 TREE_NO_WARNING (fndecl) = 1;
12982 /* Store the end of the function, so that we get good line number
12983 info for the epilogue. */
12984 cfun->function_end_locus = input_location;
12986 /* Complain about parameters that are only set, but never otherwise used. */
12987 if (warn_unused_but_set_parameter
12988 && !processing_template_decl
12989 && errorcount == unused_but_set_errorcount
12990 && !DECL_CLONED_FUNCTION_P (fndecl))
12994 for (decl = DECL_ARGUMENTS (fndecl);
12996 decl = DECL_CHAIN (decl))
12997 if (TREE_USED (decl)
12998 && TREE_CODE (decl) == PARM_DECL
12999 && !DECL_READ_P (decl)
13000 && DECL_NAME (decl)
13001 && !DECL_ARTIFICIAL (decl)
13002 && !TREE_NO_WARNING (decl)
13003 && !DECL_IN_SYSTEM_HEADER (decl)
13004 && TREE_TYPE (decl) != error_mark_node
13005 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13006 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13007 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13008 warning (OPT_Wunused_but_set_parameter,
13009 "parameter %q+D set but not used", decl);
13010 unused_but_set_errorcount = errorcount;
13013 /* Genericize before inlining. */
13014 if (!processing_template_decl)
13016 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13017 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13018 cp_genericize (fndecl);
13019 /* Clear out the bits we don't need. */
13020 f->x_current_class_ptr = NULL;
13021 f->x_current_class_ref = NULL;
13022 f->x_eh_spec_block = NULL;
13023 f->x_in_charge_parm = NULL;
13024 f->x_vtt_parm = NULL;
13025 f->x_return_value = NULL;
13026 f->bindings = NULL;
13027 f->extern_decl_map = NULL;
13029 /* Clear out the bits we don't need. */
13030 local_names = NULL;
13032 /* We're leaving the context of this function, so zap cfun. It's still in
13033 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13035 current_function_decl = NULL;
13037 /* If this is an in-class inline definition, we may have to pop the
13038 bindings for the template parameters that we added in
13039 maybe_begin_member_template_processing when start_function was
13041 if (inclass_inline)
13042 maybe_end_member_template_processing ();
13044 /* Leave the scope of the class. */
13046 pop_nested_class ();
13051 current_function_decl = NULL_TREE;
13053 defer_mark_used_calls = false;
13054 if (deferred_mark_used_calls)
13059 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13061 VEC_free (tree, gc, deferred_mark_used_calls);
13067 /* Create the FUNCTION_DECL for a function definition.
13068 DECLSPECS and DECLARATOR are the parts of the declaration;
13069 they describe the return type and the name of the function,
13070 but twisted together in a fashion that parallels the syntax of C.
13072 This function creates a binding context for the function body
13073 as well as setting up the FUNCTION_DECL in current_function_decl.
13075 Returns a FUNCTION_DECL on success.
13077 If the DECLARATOR is not suitable for a function (it defines a datum
13078 instead), we return 0, which tells yyparse to report a parse error.
13080 May return void_type_node indicating that this method is actually
13081 a friend. See grokfield for more details.
13083 Came here with a `.pushlevel' .
13085 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13086 CHANGES TO CODE IN `grokfield'. */
13089 grokmethod (cp_decl_specifier_seq *declspecs,
13090 const cp_declarator *declarator, tree attrlist)
13092 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13095 if (fndecl == error_mark_node)
13096 return error_mark_node;
13098 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13100 error ("invalid member function declaration");
13101 return error_mark_node;
13105 cplus_decl_attributes (&fndecl, attrlist, 0);
13107 /* Pass friends other than inline friend functions back. */
13108 if (fndecl == void_type_node)
13111 if (DECL_IN_AGGR_P (fndecl))
13113 if (DECL_CLASS_SCOPE_P (fndecl))
13114 error ("%qD is already defined in class %qT", fndecl,
13115 DECL_CONTEXT (fndecl));
13116 return error_mark_node;
13119 check_template_shadow (fndecl);
13121 DECL_DECLARED_INLINE_P (fndecl) = 1;
13122 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13124 /* We process method specializations in finish_struct_1. */
13125 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13127 fndecl = push_template_decl (fndecl);
13128 if (fndecl == error_mark_node)
13132 if (! DECL_FRIEND_P (fndecl))
13134 if (DECL_CHAIN (fndecl))
13136 fndecl = copy_node (fndecl);
13137 TREE_CHAIN (fndecl) = NULL_TREE;
13141 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13143 DECL_IN_AGGR_P (fndecl) = 1;
13148 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13149 we can lay it out later, when and if its type becomes complete. */
13152 maybe_register_incomplete_var (tree var)
13154 gcc_assert (TREE_CODE (var) == VAR_DECL);
13156 /* Keep track of variables with incomplete types. */
13157 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13158 && DECL_EXTERNAL (var))
13160 tree inner_type = TREE_TYPE (var);
13162 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13163 inner_type = TREE_TYPE (inner_type);
13164 inner_type = TYPE_MAIN_VARIANT (inner_type);
13166 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13167 /* RTTI TD entries are created while defining the type_info. */
13168 || (TYPE_LANG_SPECIFIC (inner_type)
13169 && TYPE_BEING_DEFINED (inner_type)))
13172 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13174 iv->incomplete_type = inner_type;
13179 /* Called when a class type (given by TYPE) is defined. If there are
13180 any existing VAR_DECLs whose type has been completed by this
13181 declaration, update them now. */
13184 complete_vars (tree type)
13187 incomplete_var *iv;
13189 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13191 if (same_type_p (type, iv->incomplete_type))
13193 tree var = iv->decl;
13194 tree type = TREE_TYPE (var);
13195 /* Complete the type of the variable. The VAR_DECL itself
13196 will be laid out in expand_expr. */
13197 complete_type (type);
13198 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13199 /* Remove this entry from the list. */
13200 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13206 /* Check for pending declarations which may have abstract type. */
13207 complete_type_check_abstract (type);
13210 /* If DECL is of a type which needs a cleanup, build and return an
13211 expression to perform that cleanup here. Return NULL_TREE if no
13212 cleanup need be done. */
13215 cxx_maybe_build_cleanup (tree decl)
13221 /* Assume no cleanup is required. */
13222 cleanup = NULL_TREE;
13224 if (error_operand_p (decl))
13227 /* Handle "__attribute__((cleanup))". We run the cleanup function
13228 before the destructor since the destructor is what actually
13229 terminates the lifetime of the object. */
13230 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13237 /* Get the name specified by the user for the cleanup function. */
13238 id = TREE_VALUE (TREE_VALUE (attr));
13239 /* Look up the name to find the cleanup function to call. It is
13240 important to use lookup_name here because that is what is
13241 used in c-common.c:handle_cleanup_attribute when performing
13242 initial checks on the attribute. Note that those checks
13243 include ensuring that the function found is not an overloaded
13244 function, or an object with an overloaded call operator,
13245 etc.; we can rely on the fact that the function found is an
13246 ordinary FUNCTION_DECL. */
13247 fn = lookup_name (id);
13248 arg = build_address (decl);
13250 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13253 /* Handle ordinary C++ destructors. */
13254 type = TREE_TYPE (decl);
13255 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13257 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13258 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13259 && CLASSTYPE_VBASECLASSES (type));
13263 if (TREE_CODE (type) == ARRAY_TYPE)
13266 addr = build_address (decl);
13268 /* Optimize for space over speed here. */
13269 if (!has_vbases || flag_expensive_optimizations)
13270 flags |= LOOKUP_NONVIRTUAL;
13272 call = build_delete (TREE_TYPE (addr), addr,
13273 sfk_complete_destructor, flags, 0);
13275 cleanup = build_compound_expr (input_location, cleanup, call);
13283 /* When a stmt has been parsed, this function is called. */
13290 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13291 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13292 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13295 static_fn_type (tree memfntype)
13300 if (TYPE_PTRMEMFUNC_P (memfntype))
13301 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13302 if (POINTER_TYPE_P (memfntype)
13303 || TREE_CODE (memfntype) == FUNCTION_DECL)
13304 memfntype = TREE_TYPE (memfntype);
13305 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13307 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13308 args = TYPE_ARG_TYPES (memfntype);
13309 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13310 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13311 fntype = (cp_build_type_attribute_variant
13312 (fntype, TYPE_ATTRIBUTES (memfntype)));
13313 fntype = (build_exception_variant
13314 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13318 /* DECL was originally constructed as a non-static member function,
13319 but turned out to be static. Update it accordingly. */
13322 revert_static_member_fn (tree decl)
13324 TREE_TYPE (decl) = static_fn_type (decl);
13326 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13327 error ("static member function %q#D declared with type qualifiers", decl);
13329 if (DECL_ARGUMENTS (decl))
13330 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13331 DECL_STATIC_FUNCTION_P (decl) = 1;
13334 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13335 one of the language-independent trees. */
13337 enum cp_tree_node_structure_enum
13338 cp_tree_node_structure (union lang_tree_node * t)
13340 switch (TREE_CODE (&t->generic))
13342 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13343 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13344 case OVERLOAD: return TS_CP_OVERLOAD;
13345 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13346 case PTRMEM_CST: return TS_CP_PTRMEM;
13347 case BASELINK: return TS_CP_BASELINK;
13348 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13349 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13350 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13351 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13352 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13353 default: return TS_CP_GENERIC;
13357 /* Build the void_list_node (void_type_node having been created). */
13359 build_void_list_node (void)
13361 tree t = build_tree_list (NULL_TREE, void_type_node);
13366 cp_missing_noreturn_ok_p (tree decl)
13368 /* A missing noreturn is ok for the `main' function. */
13369 return DECL_MAIN_P (decl);
13372 /* Return the COMDAT group into which DECL should be placed. */
13375 cxx_comdat_group (tree decl)
13379 /* Virtual tables, construction virtual tables, and virtual table
13380 tables all go in a single COMDAT group, named after the primary
13382 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13383 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13384 /* For all other DECLs, the COMDAT group is the mangled name of the
13385 declaration itself. */
13388 while (DECL_THUNK_P (decl))
13390 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13391 into the same section as the target function. In that case
13392 we must return target's name. */
13393 tree target = THUNK_TARGET (decl);
13394 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13395 && DECL_SECTION_NAME (target) != NULL
13396 && DECL_ONE_ONLY (target))
13401 name = DECL_ASSEMBLER_NAME (decl);
13407 #include "gt-cp-decl.h"