1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, tree *);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static 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((chain_next ("%h.next"))) named_label_use_entry {
182 struct named_label_use_entry *next;
183 /* The binding level to which this entry is *currently* attached.
184 This is initially the binding level in which the goto appeared,
185 but is modified as scopes are closed. */
186 struct cp_binding_level *binding_level;
187 /* The head of the names list that was current when the goto appeared,
188 or the inner scope popped. These are the decls that will *not* be
189 skipped when jumping to the label. */
191 /* The location of the goto, for error reporting. */
192 location_t o_goto_locus;
193 /* True if an OpenMP structured block scope has been closed since
194 the goto appeared. This means that the branch from the label will
195 illegally exit an OpenMP scope. */
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct GTY(()) named_label_entry {
204 /* The decl itself. */
207 /* The binding level to which the label is *currently* attached.
208 This is initially set to the binding level in which the label
209 is defined, but is modified as scopes are closed. */
210 struct cp_binding_level *binding_level;
211 /* The head of the names list that was current when the label was
212 defined, or the inner scope popped. These are the decls that will
213 be skipped when jumping to the label. */
215 /* A vector of all decls from all binding levels that would be
216 crossed by a backward branch to the label. */
217 VEC(tree,gc) *bad_decls;
219 /* A list of uses of the label, before the label is defined. */
220 struct named_label_use_entry *uses;
222 /* The following bits are set after the label is defined, and are
223 updated as scopes are popped. They indicate that a backward jump
224 to the label will illegally enter a scope of the given flavor. */
230 #define named_labels cp_function_chain->x_named_labels
232 /* The number of function bodies which we are currently processing.
233 (Zero if we are at namespace scope, one inside the body of a
234 function, two inside the body of a function in a local class, etc.) */
237 /* To avoid unwanted recursion, finish_function defers all mark_used calls
238 encountered during its execution until it finishes. */
239 bool defer_mark_used_calls;
240 VEC(tree, gc) *deferred_mark_used_calls;
242 /* States indicating how grokdeclarator() should handle declspecs marked
243 with __attribute__((deprecated)). An object declared as
244 __attribute__((deprecated)) suppresses warnings of uses of other
246 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
249 /* A list of VAR_DECLs whose type was incomplete at the time the
250 variable was declared. */
252 typedef struct GTY(()) incomplete_var_d {
254 tree incomplete_type;
257 DEF_VEC_O(incomplete_var);
258 DEF_VEC_ALLOC_O(incomplete_var,gc);
260 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
262 /* Returns the kind of template specialization we are currently
263 processing, given that it's declaration contained N_CLASS_SCOPES
264 explicit scope qualifications. */
267 current_tmpl_spec_kind (int n_class_scopes)
269 int n_template_parm_scopes = 0;
270 int seen_specialization_p = 0;
271 int innermost_specialization_p = 0;
272 struct cp_binding_level *b;
274 /* Scan through the template parameter scopes. */
275 for (b = current_binding_level;
276 b->kind == sk_template_parms;
279 /* If we see a specialization scope inside a parameter scope,
280 then something is wrong. That corresponds to a declaration
283 template <class T> template <> ...
285 which is always invalid since [temp.expl.spec] forbids the
286 specialization of a class member template if the enclosing
287 class templates are not explicitly specialized as well. */
288 if (b->explicit_spec_p)
290 if (n_template_parm_scopes == 0)
291 innermost_specialization_p = 1;
293 seen_specialization_p = 1;
295 else if (seen_specialization_p == 1)
296 return tsk_invalid_member_spec;
298 ++n_template_parm_scopes;
301 /* Handle explicit instantiations. */
302 if (processing_explicit_instantiation)
304 if (n_template_parm_scopes != 0)
305 /* We've seen a template parameter list during an explicit
306 instantiation. For example:
308 template <class T> template void f(int);
310 This is erroneous. */
311 return tsk_invalid_expl_inst;
313 return tsk_expl_inst;
316 if (n_template_parm_scopes < n_class_scopes)
317 /* We've not seen enough template headers to match all the
318 specialized classes present. For example:
320 template <class T> void R<T>::S<T>::f(int);
322 This is invalid; there needs to be one set of template
323 parameters for each class. */
324 return tsk_insufficient_parms;
325 else if (n_template_parm_scopes == n_class_scopes)
326 /* We're processing a non-template declaration (even though it may
327 be a member of a template class.) For example:
329 template <class T> void S<T>::f(int);
331 The `class T' matches the `S<T>', leaving no template headers
332 corresponding to the `f'. */
334 else if (n_template_parm_scopes > n_class_scopes + 1)
335 /* We've got too many template headers. For example:
337 template <> template <class T> void f (T);
339 There need to be more enclosing classes. */
340 return tsk_excessive_parms;
342 /* This must be a template. It's of the form:
344 template <class T> template <class U> void S<T>::f(U);
346 This is a specialization if the innermost level was a
347 specialization; otherwise it's just a definition of the
349 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
352 /* Exit the current scope. */
360 /* When a label goes out of scope, check to see if that label was used
361 in a valid manner, and issue any appropriate warnings or errors. */
364 pop_label (tree label, tree old_value)
366 if (!processing_template_decl)
368 if (DECL_INITIAL (label) == NULL_TREE)
372 error ("label %q+D used but not defined", label);
373 location = input_location; /* FIXME want (input_filename, (line)0) */
374 /* Avoid crashing later. */
375 define_label (location, DECL_NAME (label));
378 warn_for_unused_label (label);
381 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
389 pop_labels_1 (void **slot, void *data)
391 struct named_label_entry *ent = (struct named_label_entry *) *slot;
392 tree block = (tree) data;
394 pop_label (ent->label_decl, NULL_TREE);
396 /* Put the labels into the "variables" of the top-level block,
397 so debugger can see them. */
398 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
399 BLOCK_VARS (block) = ent->label_decl;
401 htab_clear_slot (named_labels, slot);
407 pop_labels (tree block)
411 htab_traverse (named_labels, pop_labels_1, block);
416 /* At the end of a block with local labels, restore the outer definition. */
419 pop_local_label (tree label, tree old_value)
421 struct named_label_entry dummy;
424 pop_label (label, old_value);
426 dummy.label_decl = label;
427 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
428 htab_clear_slot (named_labels, slot);
431 /* The following two routines are used to interface to Objective-C++.
432 The binding level is purposely treated as an opaque type. */
435 objc_get_current_scope (void)
437 return current_binding_level;
440 /* The following routine is used by the NeXT-style SJLJ exceptions;
441 variables get marked 'volatile' so as to not be clobbered by
442 _setjmp()/_longjmp() calls. All variables in the current scope,
443 as well as parent scopes up to (but not including) ENCLOSING_BLK
444 shall be thusly marked. */
447 objc_mark_locals_volatile (void *enclosing_blk)
449 struct cp_binding_level *scope;
451 for (scope = current_binding_level;
452 scope && scope != enclosing_blk;
453 scope = scope->level_chain)
457 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
458 objc_volatilize_decl (decl);
460 /* Do not climb up past the current function. */
461 if (scope->kind == sk_function_parms)
466 /* Update data for defined and undefined labels when leaving a scope. */
469 poplevel_named_label_1 (void **slot, void *data)
471 struct named_label_entry *ent = (struct named_label_entry *) *slot;
472 struct cp_binding_level *bl = (struct cp_binding_level *) data;
473 struct cp_binding_level *obl = bl->level_chain;
475 if (ent->binding_level == bl)
479 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
480 TREE_LISTs representing OVERLOADs, so be careful. */
481 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
483 : TREE_CHAIN (decl)))
484 if (decl_jump_unsafe (decl))
485 VEC_safe_push (tree, gc, ent->bad_decls, decl);
487 ent->binding_level = obl;
488 ent->names_in_scope = obl->names;
492 ent->in_try_scope = true;
495 ent->in_catch_scope = true;
498 ent->in_omp_scope = true;
506 struct named_label_use_entry *use;
508 for (use = ent->uses; use ; use = use->next)
509 if (use->binding_level == bl)
511 use->binding_level = obl;
512 use->names_in_scope = obl->names;
513 if (bl->kind == sk_omp)
514 use->in_omp_scope = true;
521 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
522 when errors were reported, except for -Werror-unused-but-set-*. */
523 static int unused_but_set_errorcount;
525 /* Exit a binding level.
526 Pop the level off, and restore the state of the identifier-decl mappings
527 that were in effect when this level was entered.
529 If KEEP == 1, this level had explicit declarations, so
530 and create a "block" (a BLOCK node) for the level
531 to record its declarations and subblocks for symbol table output.
533 If FUNCTIONBODY is nonzero, this level is the body of a function,
534 so create a block as if KEEP were set and also clear out all
537 If REVERSE is nonzero, reverse the order of decls before putting
538 them into the BLOCK. */
541 poplevel (int keep, int reverse, int functionbody)
544 /* The chain of decls was accumulated in reverse order.
545 Put it into forward order, just for cleanliness. */
550 int leaving_for_scope;
553 cp_label_binding *label_bind;
555 timevar_push (TV_NAME_LOOKUP);
560 gcc_assert (current_binding_level->kind != sk_class);
562 if (current_binding_level->kind == sk_cleanup)
564 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
566 gcc_assert (!VEC_length(cp_class_binding,
567 current_binding_level->class_shadowed));
569 /* We used to use KEEP == 2 to indicate that the new block should go
570 at the beginning of the list of blocks at this binding level,
571 rather than the end. This hack is no longer used. */
572 gcc_assert (keep == 0 || keep == 1);
574 if (current_binding_level->keep)
577 /* Any uses of undefined labels, and any defined labels, now operate
578 under constraints of next binding contour. */
579 if (cfun && !functionbody && named_labels)
580 htab_traverse (named_labels, poplevel_named_label_1,
581 current_binding_level);
583 /* Get the decls in the order they were written.
584 Usually current_binding_level->names is in reverse order.
585 But parameter decls were previously put in forward order. */
588 current_binding_level->names
589 = decls = nreverse (current_binding_level->names);
591 decls = current_binding_level->names;
593 /* If there were any declarations or structure tags in that level,
594 or if this level is a function body,
595 create a BLOCK to record them for the life of this function. */
597 if (keep == 1 || functionbody)
598 block = make_node (BLOCK);
599 if (block != NULL_TREE)
601 BLOCK_VARS (block) = decls;
602 BLOCK_SUBBLOCKS (block) = subblocks;
605 /* In each subblock, record that this is its superior. */
607 for (link = subblocks; link; link = BLOCK_CHAIN (link))
608 BLOCK_SUPERCONTEXT (link) = block;
610 /* We still support the old for-scope rules, whereby the variables
611 in a for-init statement were in scope after the for-statement
612 ended. We only use the new rules if flag_new_for_scope is
615 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
617 /* Before we remove the declarations first check for unused variables. */
618 if ((warn_unused_variable || warn_unused_but_set_variable)
619 && !processing_template_decl)
620 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
621 if (TREE_CODE (decl) == VAR_DECL
622 && (! TREE_USED (decl) || !DECL_READ_P (decl))
623 && ! DECL_IN_SYSTEM_HEADER (decl)
624 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
626 if (! TREE_USED (decl))
627 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
628 else if (DECL_CONTEXT (decl) == current_function_decl
629 && TREE_TYPE (decl) != error_mark_node
630 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
631 && errorcount == unused_but_set_errorcount
632 && (!CLASS_TYPE_P (TREE_TYPE (decl))
633 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
635 warning (OPT_Wunused_but_set_variable,
636 "variable %q+D set but not used", decl);
637 unused_but_set_errorcount = errorcount;
641 /* Remove declarations for all the DECLs in this level. */
642 for (link = decls; link; link = TREE_CHAIN (link))
644 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
647 tree name = DECL_NAME (link);
651 ob = outer_binding (name,
652 IDENTIFIER_BINDING (name),
655 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
657 ns_binding = NULL_TREE;
659 if (ob && ob->scope == current_binding_level->level_chain)
660 /* We have something like:
665 and we are leaving the `for' scope. There's no reason to
666 keep the binding of the inner `i' in this case. */
667 pop_binding (name, link);
668 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
669 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
670 /* Here, we have something like:
678 We must pop the for-scope binding so we know what's a
679 type and what isn't. */
680 pop_binding (name, link);
683 /* Mark this VAR_DECL as dead so that we can tell we left it
684 there only for backward compatibility. */
685 DECL_DEAD_FOR_LOCAL (link) = 1;
687 /* Keep track of what should have happened when we
688 popped the binding. */
691 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
692 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
695 /* Add it to the list of dead variables in the next
696 outermost binding to that we can remove these when we
697 leave that binding. */
698 VEC_safe_push (tree, gc,
699 current_binding_level->level_chain->dead_vars_from_for,
702 /* Although we don't pop the cxx_binding, we do clear
703 its SCOPE since the scope is going away now. */
704 IDENTIFIER_BINDING (name)->scope
705 = current_binding_level->level_chain;
712 /* Remove the binding. */
715 if (TREE_CODE (decl) == TREE_LIST)
716 decl = TREE_VALUE (decl);
719 if (TREE_CODE (name) == OVERLOAD)
720 name = OVL_FUNCTION (name);
722 gcc_assert (DECL_P (name));
723 pop_binding (DECL_NAME (name), decl);
727 /* Remove declarations for any `for' variables from inner scopes
728 that we kept around. */
729 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
731 pop_binding (DECL_NAME (decl), decl);
733 /* Restore the IDENTIFIER_TYPE_VALUEs. */
734 for (link = current_binding_level->type_shadowed;
735 link; link = TREE_CHAIN (link))
736 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
738 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
739 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
740 current_binding_level->shadowed_labels,
742 pop_local_label (label_bind->label, label_bind->prev_value);
744 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
745 list if a `using' declaration put them there. The debugging
746 back ends won't understand OVERLOAD, so we remove them here.
747 Because the BLOCK_VARS are (temporarily) shared with
748 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
749 popped all the bindings. */
754 for (d = &BLOCK_VARS (block); *d; )
756 if (TREE_CODE (*d) == TREE_LIST)
757 *d = TREE_CHAIN (*d);
759 d = &DECL_CHAIN (*d);
763 /* If the level being exited is the top level of a function,
764 check over all the labels. */
767 /* Since this is the top level block of a function, the vars are
768 the function's parameters. Don't leave them in the BLOCK
769 because they are found in the FUNCTION_DECL instead. */
770 BLOCK_VARS (block) = 0;
774 kind = current_binding_level->kind;
775 if (kind == sk_cleanup)
779 /* If this is a temporary binding created for a cleanup, then we'll
780 have pushed a statement list level. Pop that, create a new
781 BIND_EXPR for the block, and insert it into the stream. */
782 stmt = pop_stmt_list (current_binding_level->statement_list);
783 stmt = c_build_bind_expr (input_location, block, stmt);
790 /* The current function is being defined, so its DECL_INITIAL
791 should be error_mark_node. */
792 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
793 DECL_INITIAL (current_function_decl) = block;
796 current_binding_level->blocks
797 = chainon (current_binding_level->blocks, block);
799 /* If we did not make a block for the level just exited,
800 any blocks made for inner levels
801 (since they cannot be recorded as subblocks in that level)
802 must be carried forward so they will later become subblocks
803 of something else. */
805 current_binding_level->blocks
806 = chainon (current_binding_level->blocks, subblocks);
808 /* Each and every BLOCK node created here in `poplevel' is important
809 (e.g. for proper debugging information) so if we created one
810 earlier, mark it as "used". */
812 TREE_USED (block) = 1;
814 /* All temporary bindings created for cleanups are popped silently. */
815 if (kind == sk_cleanup)
818 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
821 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
822 itself, calling F for each. The DATA is passed to F as well. */
825 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
828 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
830 result |= (*f) (name_space, data);
832 for (; current; current = DECL_CHAIN (current))
833 result |= walk_namespaces_r (current, f, data);
838 /* Walk all the namespaces, calling F for each. The DATA is passed to
842 walk_namespaces (walk_namespaces_fn f, void* data)
844 return walk_namespaces_r (global_namespace, f, data);
847 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
848 DATA is non-NULL, this is the last time we will call
849 wrapup_global_declarations for this NAMESPACE. */
852 wrapup_globals_for_namespace (tree name_space, void* data)
854 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
855 VEC(tree,gc) *statics = level->static_decls;
856 tree *vec = VEC_address (tree, statics);
857 int len = VEC_length (tree, statics);
858 int last_time = (data != 0);
862 check_global_declarations (vec, len);
863 emit_debug_global_declarations (vec, len);
867 /* Write out any globals that need to be output. */
868 return wrapup_global_declarations (vec, len);
872 /* In C++, you don't have to write `struct S' to refer to `S'; you
873 can just use `S'. We accomplish this by creating a TYPE_DECL as
874 if the user had written `typedef struct S S'. Create and return
875 the TYPE_DECL for TYPE. */
878 create_implicit_typedef (tree name, tree type)
882 decl = build_decl (input_location, TYPE_DECL, name, type);
883 DECL_ARTIFICIAL (decl) = 1;
884 /* There are other implicit type declarations, like the one *within*
885 a class that allows you to write `S::S'. We must distinguish
887 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
888 TYPE_NAME (type) = decl;
889 TYPE_STUB_DECL (type) = decl;
894 /* Remember a local name for name-mangling purposes. */
897 push_local_name (tree decl)
902 timevar_push (TV_NAME_LOOKUP);
904 name = DECL_NAME (decl);
906 nelts = VEC_length (tree, local_names);
907 for (i = 0; i < nelts; i++)
909 t = VEC_index (tree, local_names, i);
910 if (DECL_NAME (t) == name)
912 if (!DECL_LANG_SPECIFIC (decl))
913 retrofit_lang_decl (decl);
914 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
915 if (DECL_LANG_SPECIFIC (t))
916 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
918 DECL_DISCRIMINATOR (decl) = 1;
920 VEC_replace (tree, local_names, i, decl);
921 timevar_pop (TV_NAME_LOOKUP);
926 VEC_safe_push (tree, gc, local_names, decl);
927 timevar_pop (TV_NAME_LOOKUP);
930 /* Subroutine of duplicate_decls: return truthvalue of whether
931 or not types of these decls match.
933 For C++, we must compare the parameter list so that `int' can match
934 `int&' in a parameter position, but `int&' is not confused with
938 decls_match (tree newdecl, tree olddecl)
942 if (newdecl == olddecl)
945 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
946 /* If the two DECLs are not even the same kind of thing, we're not
947 interested in their types. */
950 if (TREE_CODE (newdecl) == FUNCTION_DECL)
952 tree f1 = TREE_TYPE (newdecl);
953 tree f2 = TREE_TYPE (olddecl);
954 tree p1 = TYPE_ARG_TYPES (f1);
955 tree p2 = TYPE_ARG_TYPES (f2);
957 /* Specializations of different templates are different functions
958 even if they have the same type. */
959 tree t1 = (DECL_USE_TEMPLATE (newdecl)
960 ? DECL_TI_TEMPLATE (newdecl)
962 tree t2 = (DECL_USE_TEMPLATE (olddecl)
963 ? DECL_TI_TEMPLATE (olddecl)
968 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
969 && ! (DECL_EXTERN_C_P (newdecl)
970 && DECL_EXTERN_C_P (olddecl)))
973 #ifdef NO_IMPLICIT_EXTERN_C
974 /* A new declaration doesn't match a built-in one unless it
975 is also extern "C". */
976 if (DECL_IS_BUILTIN (olddecl)
977 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
981 if (TREE_CODE (f1) != TREE_CODE (f2))
984 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
986 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
987 && (DECL_BUILT_IN (olddecl)
988 #ifndef NO_IMPLICIT_EXTERN_C
989 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
990 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
994 types_match = self_promoting_args_p (p1);
995 if (p1 == void_list_node)
996 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
998 #ifndef NO_IMPLICIT_EXTERN_C
999 else if (!prototype_p (f1)
1000 && (DECL_EXTERN_C_P (olddecl)
1001 && DECL_IN_SYSTEM_HEADER (olddecl)
1002 && !DECL_CLASS_SCOPE_P (olddecl))
1003 && (DECL_EXTERN_C_P (newdecl)
1004 && DECL_IN_SYSTEM_HEADER (newdecl)
1005 && !DECL_CLASS_SCOPE_P (newdecl)))
1007 types_match = self_promoting_args_p (p2);
1008 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1014 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1015 || targetm.comp_type_attributes (TREE_TYPE (newdecl),
1016 TREE_TYPE (olddecl)) != 0);
1021 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1023 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1024 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1027 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1028 DECL_TEMPLATE_PARMS (olddecl)))
1031 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1032 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1033 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1035 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1036 DECL_TEMPLATE_RESULT (newdecl));
1040 /* Need to check scope for variable declaration (VAR_DECL).
1041 For typedef (TYPE_DECL), scope is ignored. */
1042 if (TREE_CODE (newdecl) == VAR_DECL
1043 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1045 Two declarations for an object with C language linkage
1046 with the same name (ignoring the namespace that qualify
1047 it) that appear in different namespace scopes refer to
1049 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1052 if (TREE_TYPE (newdecl) == error_mark_node)
1053 types_match = TREE_TYPE (olddecl) == error_mark_node;
1054 else if (TREE_TYPE (olddecl) == NULL_TREE)
1055 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1056 else if (TREE_TYPE (newdecl) == NULL_TREE)
1059 types_match = comptypes (TREE_TYPE (newdecl),
1060 TREE_TYPE (olddecl),
1061 COMPARE_REDECLARATION);
1067 /* If NEWDECL is `static' and an `extern' was seen previously,
1068 warn about it. OLDDECL is the previous declaration.
1070 Note that this does not apply to the C++ case of declaring
1071 a variable `extern const' and then later `const'.
1073 Don't complain about built-in functions, since they are beyond
1074 the user's control. */
1077 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1079 if (TREE_CODE (newdecl) == TYPE_DECL
1080 || TREE_CODE (newdecl) == TEMPLATE_DECL
1081 || TREE_CODE (newdecl) == CONST_DECL
1082 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1085 /* Don't get confused by static member functions; that's a different
1087 if (TREE_CODE (newdecl) == FUNCTION_DECL
1088 && DECL_STATIC_FUNCTION_P (newdecl))
1091 /* If the old declaration was `static', or the new one isn't, then
1092 then everything is OK. */
1093 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1096 /* It's OK to declare a builtin function as `static'. */
1097 if (TREE_CODE (olddecl) == FUNCTION_DECL
1098 && DECL_ARTIFICIAL (olddecl))
1101 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1102 permerror (input_location, "previous declaration of %q+D", olddecl);
1105 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1106 function templates. If their exception specifications do not
1107 match, issue a diagnostic. */
1110 check_redeclaration_exception_specification (tree new_decl,
1115 tree new_exceptions;
1116 tree old_exceptions;
1118 new_type = TREE_TYPE (new_decl);
1119 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1120 old_type = TREE_TYPE (old_decl);
1121 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1125 If any declaration of a function has an exception-specification,
1126 all declarations, including the definition and an explicit
1127 specialization, of that function shall have an
1128 exception-specification with the same set of type-ids. */
1129 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1130 && ! DECL_IS_BUILTIN (old_decl)
1132 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1134 error ("declaration of %qF has a different exception specifier",
1136 error ("from previous declaration %q+F", old_decl);
1140 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1141 Otherwise issue diagnostics. */
1144 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1146 old_decl = STRIP_TEMPLATE (old_decl);
1147 new_decl = STRIP_TEMPLATE (new_decl);
1148 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1149 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1151 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1152 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1154 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1156 /* Hide a built-in declaration. */
1157 DECL_DECLARED_CONSTEXPR_P (old_decl)
1158 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1161 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1162 error ("from previous declaration %q+D", old_decl);
1166 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1167 && lookup_attribute ("gnu_inline", \
1168 DECL_ATTRIBUTES (fn)))
1170 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1171 If the redeclaration is invalid, a diagnostic is issued, and the
1172 error_mark_node is returned. Otherwise, OLDDECL is returned.
1174 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1177 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1180 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1182 unsigned olddecl_uid = DECL_UID (olddecl);
1183 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1184 int new_defines_function = 0;
1185 tree new_template_info;
1187 if (newdecl == olddecl)
1190 types_match = decls_match (newdecl, olddecl);
1192 /* If either the type of the new decl or the type of the old decl is an
1193 error_mark_node, then that implies that we have already issued an
1194 error (earlier) for some bogus type specification, and in that case,
1195 it is rather pointless to harass the user with yet more error message
1196 about the same declaration, so just pretend the types match here. */
1197 if (TREE_TYPE (newdecl) == error_mark_node
1198 || TREE_TYPE (olddecl) == error_mark_node)
1199 return error_mark_node;
1201 if (DECL_P (olddecl)
1202 && TREE_CODE (newdecl) == FUNCTION_DECL
1203 && TREE_CODE (olddecl) == FUNCTION_DECL
1204 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1206 if (DECL_DECLARED_INLINE_P (newdecl)
1207 && DECL_UNINLINABLE (newdecl)
1208 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1209 /* Already warned elsewhere. */;
1210 else if (DECL_DECLARED_INLINE_P (olddecl)
1211 && DECL_UNINLINABLE (olddecl)
1212 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1213 /* Already warned. */;
1214 else if (DECL_DECLARED_INLINE_P (newdecl)
1215 && DECL_UNINLINABLE (olddecl)
1216 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1220 warning (OPT_Wattributes, "previous declaration of %q+D "
1221 "with attribute noinline", olddecl);
1223 else if (DECL_DECLARED_INLINE_P (olddecl)
1224 && DECL_UNINLINABLE (newdecl)
1225 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1227 warning (OPT_Wattributes, "function %q+D redeclared with "
1228 "attribute noinline", newdecl);
1229 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1234 /* Check for redeclaration and other discrepancies. */
1235 if (TREE_CODE (olddecl) == FUNCTION_DECL
1236 && DECL_ARTIFICIAL (olddecl))
1238 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1239 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1241 /* Avoid warnings redeclaring built-ins which have not been
1242 explicitly declared. */
1243 if (DECL_ANTICIPATED (olddecl))
1246 /* If you declare a built-in or predefined function name as static,
1247 the old definition is overridden, but optionally warn this was a
1248 bad choice of name. */
1249 if (! TREE_PUBLIC (newdecl))
1251 warning (OPT_Wshadow,
1252 DECL_BUILT_IN (olddecl)
1253 ? G_("shadowing built-in function %q#D")
1254 : G_("shadowing library function %q#D"), olddecl);
1255 /* Discard the old built-in function. */
1258 /* If the built-in is not ansi, then programs can override
1259 it even globally without an error. */
1260 else if (! DECL_BUILT_IN (olddecl))
1261 warning (0, "library function %q#D redeclared as non-function %q#D",
1265 error ("declaration of %q#D", newdecl);
1266 error ("conflicts with built-in declaration %q#D",
1271 else if (!types_match)
1273 /* Avoid warnings redeclaring built-ins which have not been
1274 explicitly declared. */
1275 if (DECL_ANTICIPATED (olddecl))
1277 /* Deal with fileptr_type_node. FILE type is not known
1278 at the time we create the builtins. */
1281 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1282 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1284 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1287 else if (TREE_VALUE (t2) == fileptr_type_node)
1289 tree t = TREE_VALUE (t1);
1291 if (TREE_CODE (t) == POINTER_TYPE
1292 && TYPE_NAME (TREE_TYPE (t))
1293 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1294 == get_identifier ("FILE")
1295 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1297 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1299 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1300 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1301 types_match = decls_match (newdecl, olddecl);
1303 return duplicate_decls (newdecl, olddecl,
1305 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1308 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1311 else if ((DECL_EXTERN_C_P (newdecl)
1312 && DECL_EXTERN_C_P (olddecl))
1313 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1314 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1316 /* A near match; override the builtin. */
1318 if (TREE_PUBLIC (newdecl))
1320 warning (0, "new declaration %q#D", newdecl);
1321 warning (0, "ambiguates built-in declaration %q#D",
1325 warning (OPT_Wshadow,
1326 DECL_BUILT_IN (olddecl)
1327 ? G_("shadowing built-in function %q#D")
1328 : G_("shadowing library function %q#D"), olddecl);
1331 /* Discard the old built-in function. */
1334 /* Replace the old RTL to avoid problems with inlining. */
1335 COPY_DECL_RTL (newdecl, olddecl);
1337 /* Even if the types match, prefer the new declarations type for
1338 built-ins which have not been explicitly declared, for
1339 exception lists, etc... */
1340 else if (DECL_IS_BUILTIN (olddecl))
1342 tree type = TREE_TYPE (newdecl);
1343 tree attribs = (*targetm.merge_type_attributes)
1344 (TREE_TYPE (olddecl), type);
1346 type = cp_build_type_attribute_variant (type, attribs);
1347 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1350 /* If a function is explicitly declared "throw ()", propagate that to
1351 the corresponding builtin. */
1352 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1353 && DECL_ANTICIPATED (olddecl)
1354 && TREE_NOTHROW (newdecl)
1355 && !TREE_NOTHROW (olddecl)
1356 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1357 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1359 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1361 /* Whether or not the builtin can throw exceptions has no
1362 bearing on this declarator. */
1363 TREE_NOTHROW (olddecl) = 0;
1365 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1367 /* If a builtin function is redeclared as `static', merge
1368 the declarations, but make the original one static. */
1369 DECL_THIS_STATIC (olddecl) = 1;
1370 TREE_PUBLIC (olddecl) = 0;
1372 /* Make the old declaration consistent with the new one so
1373 that all remnants of the builtin-ness of this function
1374 will be banished. */
1375 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1376 COPY_DECL_RTL (newdecl, olddecl);
1379 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1381 /* C++ Standard, 3.3, clause 4:
1382 "[Note: a namespace name or a class template name must be unique
1383 in its declarative region (7.3.2, clause 14). ]" */
1384 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1385 && TREE_CODE (newdecl) != NAMESPACE_DECL
1386 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1387 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1388 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1389 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1391 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1392 && TREE_CODE (newdecl) != TYPE_DECL)
1393 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1394 && TREE_CODE (olddecl) != TYPE_DECL))
1396 /* We do nothing special here, because C++ does such nasty
1397 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1398 get shadowed, and know that if we need to find a TYPE_DECL
1399 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1400 slot of the identifier. */
1404 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1405 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1406 || (TREE_CODE (olddecl) == FUNCTION_DECL
1407 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1411 error ("%q#D redeclared as different kind of symbol", newdecl);
1412 if (TREE_CODE (olddecl) == TREE_LIST)
1413 olddecl = TREE_VALUE (olddecl);
1414 error ("previous declaration of %q+#D", olddecl);
1416 return error_mark_node;
1418 else if (!types_match)
1420 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1421 /* These are certainly not duplicate declarations; they're
1422 from different scopes. */
1425 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1427 /* The name of a class template may not be declared to refer to
1428 any other template, class, function, object, namespace, value,
1429 or type in the same scope. */
1430 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1431 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1433 error ("declaration of template %q#D", newdecl);
1434 error ("conflicts with previous declaration %q+#D", olddecl);
1436 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1437 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1438 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1439 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1440 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1441 DECL_TEMPLATE_PARMS (olddecl))
1442 /* Template functions can be disambiguated by
1444 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1445 TREE_TYPE (TREE_TYPE (olddecl))))
1447 error ("new declaration %q#D", newdecl);
1448 error ("ambiguates old declaration %q+#D", olddecl);
1452 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1454 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1456 error ("declaration of C function %q#D conflicts with",
1458 error ("previous declaration %q+#D here", olddecl);
1460 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1461 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1463 error ("new declaration %q#D", newdecl);
1464 error ("ambiguates old declaration %q+#D", olddecl);
1465 return error_mark_node;
1472 error ("conflicting declaration %q#D", newdecl);
1473 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1474 return error_mark_node;
1477 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1478 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1479 && (!DECL_TEMPLATE_INFO (newdecl)
1480 || (DECL_TI_TEMPLATE (newdecl)
1481 != DECL_TI_TEMPLATE (olddecl))))
1482 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1483 && (!DECL_TEMPLATE_INFO (olddecl)
1484 || (DECL_TI_TEMPLATE (olddecl)
1485 != DECL_TI_TEMPLATE (newdecl))))))
1486 /* It's OK to have a template specialization and a non-template
1487 with the same type, or to have specializations of two
1488 different templates with the same type. Note that if one is a
1489 specialization, and the other is an instantiation of the same
1490 template, that we do not exit at this point. That situation
1491 can occur if we instantiate a template class, and then
1492 specialize one of its methods. This situation is valid, but
1493 the declarations must be merged in the usual way. */
1495 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1496 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1497 && !DECL_USE_TEMPLATE (newdecl))
1498 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1499 && !DECL_USE_TEMPLATE (olddecl))))
1500 /* One of the declarations is a template instantiation, and the
1501 other is not a template at all. That's OK. */
1503 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1505 /* In [namespace.alias] we have:
1507 In a declarative region, a namespace-alias-definition can be
1508 used to redefine a namespace-alias declared in that declarative
1509 region to refer only to the namespace to which it already
1512 Therefore, if we encounter a second alias directive for the same
1513 alias, we can just ignore the second directive. */
1514 if (DECL_NAMESPACE_ALIAS (newdecl)
1515 && (DECL_NAMESPACE_ALIAS (newdecl)
1516 == DECL_NAMESPACE_ALIAS (olddecl)))
1518 /* [namespace.alias]
1520 A namespace-name or namespace-alias shall not be declared as
1521 the name of any other entity in the same declarative region.
1522 A namespace-name defined at global scope shall not be
1523 declared as the name of any other entity in any global scope
1525 error ("declaration of namespace %qD conflicts with", newdecl);
1526 error ("previous declaration of namespace %q+D here", olddecl);
1527 return error_mark_node;
1531 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1534 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1535 if (DECL_NAME (olddecl) != NULL_TREE)
1536 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1537 ? "%q+#D previously defined here"
1538 : "%q+#D previously declared here", olddecl);
1539 return error_mark_node;
1541 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1542 && DECL_INITIAL (olddecl) != NULL_TREE
1543 && !prototype_p (TREE_TYPE (olddecl))
1544 && prototype_p (TREE_TYPE (newdecl)))
1546 /* Prototype decl follows defn w/o prototype. */
1547 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1548 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1549 "follows non-prototype definition here");
1551 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1552 || TREE_CODE (olddecl) == VAR_DECL)
1553 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1556 If two declarations of the same function or object
1557 specify different linkage-specifications ..., the program
1558 is ill-formed.... Except for functions with C++ linkage,
1559 a function declaration without a linkage specification
1560 shall not precede the first linkage specification for
1561 that function. A function can be declared without a
1562 linkage specification after an explicit linkage
1563 specification has been seen; the linkage explicitly
1564 specified in the earlier declaration is not affected by
1565 such a function declaration.
1567 DR 563 raises the question why the restrictions on
1568 functions should not also apply to objects. Older
1569 versions of G++ silently ignore the linkage-specification
1577 which is clearly wrong. Therefore, we now treat objects
1579 if (current_lang_depth () == 0)
1581 /* There is no explicit linkage-specification, so we use
1582 the linkage from the previous declaration. */
1583 if (!DECL_LANG_SPECIFIC (newdecl))
1584 retrofit_lang_decl (newdecl);
1585 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1589 error ("previous declaration of %q+#D with %qL linkage",
1590 olddecl, DECL_LANGUAGE (olddecl));
1591 error ("conflicts with new declaration with %qL linkage",
1592 DECL_LANGUAGE (newdecl));
1596 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1598 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1600 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1601 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1604 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1605 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1607 for (; t1 && t1 != void_list_node;
1608 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1609 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1611 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1614 permerror (input_location, "default argument given for parameter %d of %q#D",
1616 permerror (input_location, "after previous specification in %q+#D", olddecl);
1620 error ("default argument given for parameter %d of %q#D",
1622 error ("after previous specification in %q+#D",
1629 /* Do not merge an implicit typedef with an explicit one. In:
1633 typedef class A A __attribute__ ((foo));
1635 the attribute should apply only to the typedef. */
1636 if (TREE_CODE (olddecl) == TYPE_DECL
1637 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1638 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1641 /* If new decl is `static' and an `extern' was seen previously,
1643 warn_extern_redeclared_static (newdecl, olddecl);
1645 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1646 return error_mark_node;
1648 /* We have committed to returning 1 at this point. */
1649 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1651 /* Now that functions must hold information normally held
1652 by field decls, there is extra work to do so that
1653 declaration information does not get destroyed during
1655 if (DECL_VINDEX (olddecl))
1656 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1657 if (DECL_CONTEXT (olddecl))
1658 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1659 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1660 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1661 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1662 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1663 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1664 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1665 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1666 SET_OVERLOADED_OPERATOR_CODE
1667 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1668 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1670 /* Optionally warn about more than one declaration for the same
1671 name, but don't warn about a function declaration followed by a
1673 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1674 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1675 /* Don't warn about extern decl followed by definition. */
1676 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1677 /* Don't warn about friends, let add_friend take care of it. */
1678 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1680 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1681 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1684 if (DECL_DELETED_FN (newdecl))
1686 error ("deleted definition of %qD", newdecl);
1687 error ("after previous declaration %q+D", olddecl);
1691 /* Deal with C++: must preserve virtual function table size. */
1692 if (TREE_CODE (olddecl) == TYPE_DECL)
1694 tree newtype = TREE_TYPE (newdecl);
1695 tree oldtype = TREE_TYPE (olddecl);
1697 if (newtype != error_mark_node && oldtype != error_mark_node
1698 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1699 CLASSTYPE_FRIEND_CLASSES (newtype)
1700 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1702 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1705 /* Copy all the DECL_... slots specified in the new decl
1706 except for any that we copy here from the old type. */
1707 DECL_ATTRIBUTES (newdecl)
1708 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1710 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1714 old_result = DECL_TEMPLATE_RESULT (olddecl);
1715 new_result = DECL_TEMPLATE_RESULT (newdecl);
1716 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1717 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1718 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1719 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1721 DECL_ATTRIBUTES (old_result)
1722 = (*targetm.merge_decl_attributes) (old_result, new_result);
1724 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1726 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1727 && DECL_INITIAL (new_result))
1729 if (DECL_INITIAL (old_result))
1730 DECL_UNINLINABLE (old_result) = 1;
1732 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1733 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1734 DECL_NOT_REALLY_EXTERN (old_result)
1735 = DECL_NOT_REALLY_EXTERN (new_result);
1736 DECL_INTERFACE_KNOWN (old_result)
1737 = DECL_INTERFACE_KNOWN (new_result);
1738 DECL_DECLARED_INLINE_P (old_result)
1739 = DECL_DECLARED_INLINE_P (new_result);
1740 DECL_DISREGARD_INLINE_LIMITS (old_result)
1741 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1746 DECL_DECLARED_INLINE_P (old_result)
1747 |= DECL_DECLARED_INLINE_P (new_result);
1748 DECL_DISREGARD_INLINE_LIMITS (old_result)
1749 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1750 check_redeclaration_exception_specification (newdecl, olddecl);
1754 /* If the new declaration is a definition, update the file and
1755 line information on the declaration, and also make
1756 the old declaration the same definition. */
1757 if (DECL_INITIAL (new_result) != NULL_TREE)
1759 DECL_SOURCE_LOCATION (olddecl)
1760 = DECL_SOURCE_LOCATION (old_result)
1761 = DECL_SOURCE_LOCATION (newdecl);
1762 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1763 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1766 DECL_ARGUMENTS (old_result)
1767 = DECL_ARGUMENTS (new_result);
1768 for (parm = DECL_ARGUMENTS (old_result); parm;
1769 parm = DECL_CHAIN (parm))
1770 DECL_CONTEXT (parm) = old_result;
1779 /* Automatically handles default parameters. */
1780 tree oldtype = TREE_TYPE (olddecl);
1783 /* Merge the data types specified in the two decls. */
1784 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1786 /* If merge_types produces a non-typedef type, just use the old type. */
1787 if (TREE_CODE (newdecl) == TYPE_DECL
1788 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1791 if (TREE_CODE (newdecl) == VAR_DECL)
1793 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1794 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1795 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1796 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1797 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1798 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1800 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1801 if (DECL_LANG_SPECIFIC (olddecl)
1802 && CP_DECL_THREADPRIVATE_P (olddecl))
1804 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1805 if (!DECL_LANG_SPECIFIC (newdecl))
1806 retrofit_lang_decl (newdecl);
1808 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1809 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1813 /* Do this after calling `merge_types' so that default
1814 parameters don't confuse us. */
1815 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1816 check_redeclaration_exception_specification (newdecl, olddecl);
1817 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1819 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1820 check_default_args (newdecl);
1822 /* Lay the type out, unless already done. */
1823 if (! same_type_p (newtype, oldtype)
1824 && TREE_TYPE (newdecl) != error_mark_node
1825 && !(processing_template_decl && uses_template_parms (newdecl)))
1826 layout_type (TREE_TYPE (newdecl));
1828 if ((TREE_CODE (newdecl) == VAR_DECL
1829 || TREE_CODE (newdecl) == PARM_DECL
1830 || TREE_CODE (newdecl) == RESULT_DECL
1831 || TREE_CODE (newdecl) == FIELD_DECL
1832 || TREE_CODE (newdecl) == TYPE_DECL)
1833 && !(processing_template_decl && uses_template_parms (newdecl)))
1834 layout_decl (newdecl, 0);
1836 /* Merge the type qualifiers. */
1837 if (TREE_READONLY (newdecl))
1838 TREE_READONLY (olddecl) = 1;
1839 if (TREE_THIS_VOLATILE (newdecl))
1840 TREE_THIS_VOLATILE (olddecl) = 1;
1841 if (TREE_NOTHROW (newdecl))
1842 TREE_NOTHROW (olddecl) = 1;
1844 /* Merge deprecatedness. */
1845 if (TREE_DEPRECATED (newdecl))
1846 TREE_DEPRECATED (olddecl) = 1;
1848 /* Preserve function specific target and optimization options */
1849 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1851 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1852 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1853 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1854 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1856 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1857 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1858 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1859 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1862 /* Merge the initialization information. */
1863 if (DECL_INITIAL (newdecl) == NULL_TREE
1864 && DECL_INITIAL (olddecl) != NULL_TREE)
1866 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1867 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1868 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1870 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1871 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1875 /* Merge the section attribute.
1876 We want to issue an error if the sections conflict but that must be
1877 done later in decl_attributes since we are called before attributes
1879 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1880 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1882 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1884 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1885 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1886 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1887 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1888 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1889 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1890 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1891 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1892 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1893 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1894 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1895 /* Keep the old RTL. */
1896 COPY_DECL_RTL (olddecl, newdecl);
1898 else if (TREE_CODE (newdecl) == VAR_DECL
1899 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1901 /* Keep the old RTL. We cannot keep the old RTL if the old
1902 declaration was for an incomplete object and the new
1903 declaration is not since many attributes of the RTL will
1905 COPY_DECL_RTL (olddecl, newdecl);
1908 /* If cannot merge, then use the new type and qualifiers,
1909 and don't preserve the old rtl. */
1912 /* Clean out any memory we had of the old declaration. */
1913 tree oldstatic = value_member (olddecl, static_aggregates);
1915 TREE_VALUE (oldstatic) = error_mark_node;
1917 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1918 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1919 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1920 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1923 /* Merge the storage class information. */
1924 merge_weak (newdecl, olddecl);
1926 if (DECL_ONE_ONLY (olddecl))
1927 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1929 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1930 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1931 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1932 if (! DECL_EXTERNAL (olddecl))
1933 DECL_EXTERNAL (newdecl) = 0;
1935 new_template_info = NULL_TREE;
1936 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1938 bool new_redefines_gnu_inline = false;
1940 if (new_defines_function
1941 && ((DECL_INTERFACE_KNOWN (olddecl)
1942 && TREE_CODE (olddecl) == FUNCTION_DECL)
1943 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1944 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1945 == FUNCTION_DECL))))
1949 if (TREE_CODE (fn) == TEMPLATE_DECL)
1950 fn = DECL_TEMPLATE_RESULT (olddecl);
1952 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1955 if (!new_redefines_gnu_inline)
1957 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1958 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1959 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1961 DECL_TEMPLATE_INSTANTIATED (newdecl)
1962 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1963 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1965 /* If the OLDDECL is an instantiation and/or specialization,
1966 then the NEWDECL must be too. But, it may not yet be marked
1967 as such if the caller has created NEWDECL, but has not yet
1968 figured out that it is a redeclaration. */
1969 if (!DECL_USE_TEMPLATE (newdecl))
1970 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1972 /* Don't really know how much of the language-specific
1973 values we should copy from old to new. */
1974 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1975 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1976 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1977 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1979 if (LANG_DECL_HAS_MIN (newdecl))
1981 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1982 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1983 if (DECL_TEMPLATE_INFO (newdecl))
1984 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1985 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1987 /* Only functions have these fields. */
1988 if (TREE_CODE (newdecl) == FUNCTION_DECL
1989 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1991 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1992 olddecl_friend = DECL_FRIEND_P (olddecl);
1993 hidden_friend = (DECL_ANTICIPATED (olddecl)
1994 && DECL_HIDDEN_FRIEND_P (olddecl)
1995 && newdecl_is_friend);
1996 DECL_BEFRIENDING_CLASSES (newdecl)
1997 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1998 DECL_BEFRIENDING_CLASSES (olddecl));
1999 /* DECL_THUNKS is only valid for virtual functions,
2000 otherwise it is a DECL_FRIEND_CONTEXT. */
2001 if (DECL_VIRTUAL_P (newdecl))
2002 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2004 /* Only variables have this field. */
2005 else if (TREE_CODE (newdecl) == VAR_DECL
2006 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2007 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2010 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2014 /* Merge parameter attributes. */
2015 tree oldarg, newarg;
2016 for (oldarg = DECL_ARGUMENTS(olddecl),
2017 newarg = DECL_ARGUMENTS(newdecl);
2019 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2020 DECL_ATTRIBUTES (newarg)
2021 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2022 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2025 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2026 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2028 /* If newdecl is not a specialization, then it is not a
2029 template-related function at all. And that means that we
2030 should have exited above, returning 0. */
2031 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2033 if (DECL_ODR_USED (olddecl))
2034 /* From [temp.expl.spec]:
2036 If a template, a member template or the member of a class
2037 template is explicitly specialized then that
2038 specialization shall be declared before the first use of
2039 that specialization that would cause an implicit
2040 instantiation to take place, in every translation unit in
2041 which such a use occurs. */
2042 error ("explicit specialization of %qD after first use",
2045 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2047 /* Don't propagate visibility from the template to the
2048 specialization here. We'll do that in determine_visibility if
2050 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2052 /* [temp.expl.spec/14] We don't inline explicit specialization
2053 just because the primary template says so. */
2055 else if (new_defines_function && DECL_INITIAL (olddecl))
2057 /* Never inline re-defined extern inline functions.
2058 FIXME: this could be better handled by keeping both
2059 function as separate declarations. */
2060 DECL_UNINLINABLE (newdecl) = 1;
2064 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2065 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2067 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2069 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2070 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2072 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2073 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2074 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2075 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2078 /* Preserve abstractness on cloned [cd]tors. */
2079 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2081 /* Update newdecl's parms to point at olddecl. */
2082 for (parm = DECL_ARGUMENTS (newdecl); parm;
2083 parm = DECL_CHAIN (parm))
2084 DECL_CONTEXT (parm) = olddecl;
2088 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2089 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2090 COPY_DECL_RTL (newdecl, olddecl);
2092 if (! types_match || new_defines_function)
2094 /* These need to be copied so that the names are available.
2095 Note that if the types do match, we'll preserve inline
2096 info and other bits, but if not, we won't. */
2097 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2098 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2100 if (new_defines_function)
2101 /* If defining a function declared with other language
2102 linkage, use the previously declared language linkage. */
2103 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2104 else if (types_match)
2106 /* If redeclaring a builtin function, and not a definition,
2107 it stays built in. */
2108 if (DECL_BUILT_IN (olddecl))
2110 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2111 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2112 /* If we're keeping the built-in definition, keep the rtl,
2113 regardless of declaration matches. */
2114 COPY_DECL_RTL (olddecl, newdecl);
2117 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2118 /* Don't clear out the arguments if we're just redeclaring a
2120 if (DECL_ARGUMENTS (olddecl))
2121 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2124 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2125 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2127 /* Now preserve various other info from the definition. */
2128 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2129 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2130 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2131 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2133 /* Warn about conflicting visibility specifications. */
2134 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2135 && DECL_VISIBILITY_SPECIFIED (newdecl)
2136 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2138 warning_at (input_location, OPT_Wattributes,
2139 "%q+D: visibility attribute ignored because it", newdecl);
2140 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2141 "conflicts with previous declaration here");
2143 /* Choose the declaration which specified visibility. */
2144 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2146 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2147 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2149 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2150 so keep this behavior. */
2151 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2153 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2154 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2156 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2157 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2158 if (TREE_CODE (newdecl) == FIELD_DECL)
2159 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2161 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2162 with that from NEWDECL below. */
2163 if (DECL_LANG_SPECIFIC (olddecl))
2165 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2166 != DECL_LANG_SPECIFIC (newdecl));
2167 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2170 /* Merge the USED information. */
2171 if (TREE_USED (olddecl))
2172 TREE_USED (newdecl) = 1;
2173 else if (TREE_USED (newdecl))
2174 TREE_USED (olddecl) = 1;
2175 if (TREE_CODE (newdecl) == VAR_DECL)
2177 if (DECL_READ_P (olddecl))
2178 DECL_READ_P (newdecl) = 1;
2179 else if (DECL_READ_P (newdecl))
2180 DECL_READ_P (olddecl) = 1;
2182 if (DECL_PRESERVE_P (olddecl))
2183 DECL_PRESERVE_P (newdecl) = 1;
2184 else if (DECL_PRESERVE_P (newdecl))
2185 DECL_PRESERVE_P (olddecl) = 1;
2187 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2191 function_size = sizeof (struct tree_decl_common);
2193 memcpy ((char *) olddecl + sizeof (struct tree_common),
2194 (char *) newdecl + sizeof (struct tree_common),
2195 function_size - sizeof (struct tree_common));
2197 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2198 (char *) newdecl + sizeof (struct tree_decl_common),
2199 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2200 if (new_template_info)
2201 /* If newdecl is a template instantiation, it is possible that
2202 the following sequence of events has occurred:
2204 o A friend function was declared in a class template. The
2205 class template was instantiated.
2207 o The instantiation of the friend declaration was
2208 recorded on the instantiation list, and is newdecl.
2210 o Later, however, instantiate_class_template called pushdecl
2211 on the newdecl to perform name injection. But, pushdecl in
2212 turn called duplicate_decls when it discovered that another
2213 declaration of a global function with the same name already
2216 o Here, in duplicate_decls, we decided to clobber newdecl.
2218 If we're going to do that, we'd better make sure that
2219 olddecl, and not newdecl, is on the list of
2220 instantiations so that if we try to do the instantiation
2221 again we won't get the clobbered declaration. */
2222 reregister_specialization (newdecl,
2228 size_t size = tree_code_size (TREE_CODE (olddecl));
2229 memcpy ((char *) olddecl + sizeof (struct tree_common),
2230 (char *) newdecl + sizeof (struct tree_common),
2231 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2232 switch (TREE_CODE (olddecl))
2242 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2243 (char *) newdecl + sizeof (struct tree_decl_common),
2244 size - sizeof (struct tree_decl_common)
2245 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2249 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2250 (char *) newdecl + sizeof (struct tree_decl_common),
2251 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2252 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2256 DECL_UID (olddecl) = olddecl_uid;
2258 DECL_FRIEND_P (olddecl) = 1;
2261 DECL_ANTICIPATED (olddecl) = 1;
2262 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2265 /* NEWDECL contains the merged attribute lists.
2266 Update OLDDECL to be the same. */
2267 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2269 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2270 so that encode_section_info has a chance to look at the new decl
2271 flags and attributes. */
2272 if (DECL_RTL_SET_P (olddecl)
2273 && (TREE_CODE (olddecl) == FUNCTION_DECL
2274 || (TREE_CODE (olddecl) == VAR_DECL
2275 && TREE_STATIC (olddecl))))
2276 make_decl_rtl (olddecl);
2278 /* The NEWDECL will no longer be needed. Because every out-of-class
2279 declaration of a member results in a call to duplicate_decls,
2280 freeing these nodes represents in a significant savings. */
2286 /* Return zero if the declaration NEWDECL is valid
2287 when the declaration OLDDECL (assumed to be for the same name)
2288 has already been seen.
2289 Otherwise return an error message format string with a %s
2290 where the identifier should go. */
2293 redeclaration_error_message (tree newdecl, tree olddecl)
2295 if (TREE_CODE (newdecl) == TYPE_DECL)
2297 /* Because C++ can put things into name space for free,
2298 constructs like "typedef struct foo { ... } foo"
2299 would look like an erroneous redeclaration. */
2300 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2303 return G_("redefinition of %q#D");
2305 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2307 /* If this is a pure function, its olddecl will actually be
2308 the original initialization to `0' (which we force to call
2309 abort()). Don't complain about redefinition in this case. */
2310 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2311 && DECL_INITIAL (olddecl) == NULL_TREE)
2314 /* If both functions come from different namespaces, this is not
2315 a redeclaration - this is a conflict with a used function. */
2316 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2317 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2318 && ! decls_match (olddecl, newdecl))
2319 return G_("%qD conflicts with used function");
2321 /* We'll complain about linkage mismatches in
2322 warn_extern_redeclared_static. */
2324 /* Defining the same name twice is no good. */
2325 if (DECL_INITIAL (olddecl) != NULL_TREE
2326 && DECL_INITIAL (newdecl) != NULL_TREE)
2328 if (DECL_NAME (olddecl) == NULL_TREE)
2329 return G_("%q#D not declared in class");
2330 else if (!GNU_INLINE_P (olddecl)
2331 || GNU_INLINE_P (newdecl))
2332 return G_("redefinition of %q#D");
2335 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2337 bool olda = GNU_INLINE_P (olddecl);
2338 bool newa = GNU_INLINE_P (newdecl);
2343 return G_("%q+D redeclared inline with "
2344 "%<gnu_inline%> attribute");
2346 return G_("%q+D redeclared inline without "
2347 "%<gnu_inline%> attribute");
2353 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2357 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2359 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2360 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2361 return G_("redefinition of %q#D");
2365 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2366 || (DECL_TEMPLATE_RESULT (newdecl)
2367 == DECL_TEMPLATE_RESULT (olddecl)))
2370 nt = DECL_TEMPLATE_RESULT (newdecl);
2371 if (DECL_TEMPLATE_INFO (nt))
2372 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2373 ot = DECL_TEMPLATE_RESULT (olddecl);
2374 if (DECL_TEMPLATE_INFO (ot))
2375 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2376 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2377 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2378 return G_("redefinition of %q#D");
2380 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2382 bool olda = GNU_INLINE_P (ot);
2383 bool newa = GNU_INLINE_P (nt);
2388 return G_("%q+D redeclared inline with "
2389 "%<gnu_inline%> attribute");
2391 return G_("%q+D redeclared inline without "
2392 "%<gnu_inline%> attribute");
2396 /* Core issue #226 (C++0x):
2398 If a friend function template declaration specifies a
2399 default template-argument, that declaration shall be a
2400 definition and shall be the only declaration of the
2401 function template in the translation unit. */
2402 if ((cxx_dialect != cxx98)
2403 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2404 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2405 /*is_primary=*/1, /*is_partial=*/0,
2406 /*is_friend_decl=*/2))
2407 return G_("redeclaration of friend %q#D "
2408 "may not have default template arguments");
2412 else if (TREE_CODE (newdecl) == VAR_DECL
2413 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2414 && (! DECL_LANG_SPECIFIC (olddecl)
2415 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2416 || DECL_THREAD_LOCAL_P (newdecl)))
2418 /* Only variables can be thread-local, and all declarations must
2419 agree on this property. */
2420 if (DECL_THREAD_LOCAL_P (newdecl))
2421 return G_("thread-local declaration of %q#D follows "
2422 "non-thread-local declaration");
2424 return G_("non-thread-local declaration of %q#D follows "
2425 "thread-local declaration");
2427 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2429 /* The objects have been declared at namespace scope. If either
2430 is a member of an anonymous union, then this is an invalid
2431 redeclaration. For example:
2437 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2438 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2439 return G_("redeclaration of %q#D");
2440 /* If at least one declaration is a reference, there is no
2441 conflict. For example:
2447 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2449 /* Reject two definitions. */
2450 return G_("redefinition of %q#D");
2454 /* Objects declared with block scope: */
2455 /* Reject two definitions, and reject a definition
2456 together with an external reference. */
2457 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2458 return G_("redeclaration of %q#D");
2463 /* Hash and equality functions for the named_label table. */
2466 named_label_entry_hash (const void *data)
2468 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2469 return DECL_UID (ent->label_decl);
2473 named_label_entry_eq (const void *a, const void *b)
2475 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2476 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2477 return ent_a->label_decl == ent_b->label_decl;
2480 /* Create a new label, named ID. */
2483 make_label_decl (tree id, int local_p)
2485 struct named_label_entry *ent;
2489 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2491 DECL_CONTEXT (decl) = current_function_decl;
2492 DECL_MODE (decl) = VOIDmode;
2493 C_DECLARED_LABEL_FLAG (decl) = local_p;
2495 /* Say where one reference is to the label, for the sake of the
2496 error if it is not defined. */
2497 DECL_SOURCE_LOCATION (decl) = input_location;
2499 /* Record the fact that this identifier is bound to this label. */
2500 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2502 /* Create the label htab for the function on demand. */
2504 named_labels = htab_create_ggc (13, named_label_entry_hash,
2505 named_label_entry_eq, NULL);
2507 /* Record this label on the list of labels used in this function.
2508 We do this before calling make_label_decl so that we get the
2509 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2510 ent = ggc_alloc_cleared_named_label_entry ();
2511 ent->label_decl = decl;
2513 slot = htab_find_slot (named_labels, ent, INSERT);
2514 gcc_assert (*slot == NULL);
2520 /* Look for a label named ID in the current function. If one cannot
2521 be found, create one. (We keep track of used, but undefined,
2522 labels, and complain about them at the end of a function.) */
2525 lookup_label (tree id)
2529 timevar_push (TV_NAME_LOOKUP);
2530 /* You can't use labels at global scope. */
2531 if (current_function_decl == NULL_TREE)
2533 error ("label %qE referenced outside of any function", id);
2534 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2537 /* See if we've already got this label. */
2538 decl = IDENTIFIER_LABEL_VALUE (id);
2539 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2540 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2542 decl = make_label_decl (id, /*local_p=*/0);
2543 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2546 /* Declare a local label named ID. */
2549 declare_local_label (tree id)
2552 cp_label_binding *bind;
2554 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2555 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2556 bind = VEC_safe_push (cp_label_binding, gc,
2557 current_binding_level->shadowed_labels, NULL);
2558 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2560 decl = make_label_decl (id, /*local_p=*/1);
2566 /* Returns nonzero if it is ill-formed to jump past the declaration of
2567 DECL. Returns 2 if it's also a real problem. */
2570 decl_jump_unsafe (tree decl)
2572 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2573 with automatic storage duration is not in scope to a point where it is
2574 in scope is ill-formed unless the variable has scalar type, class type
2575 with a trivial default constructor and a trivial destructor, a
2576 cv-qualified version of one of these types, or an array of one of the
2577 preceding types and is declared without an initializer (8.5). */
2578 tree type = TREE_TYPE (decl);
2580 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2581 || type == error_mark_node)
2584 type = strip_array_types (type);
2586 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2587 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2590 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2596 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2599 identify_goto (tree decl, const location_t *locus)
2602 permerror (input_location, "jump to label %qD", decl);
2604 permerror (input_location, "jump to case label");
2606 permerror (*locus, " from here");
2609 /* Check that a single previously seen jump to a newly defined label
2610 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2611 the jump context; NAMES are the names in scope in LEVEL at the jump
2612 context; LOCUS is the source position of the jump or 0. Returns
2613 true if all is well. */
2616 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2617 bool exited_omp, const location_t *locus)
2619 struct cp_binding_level *b;
2620 bool identified = false, saw_eh = false, saw_omp = false;
2624 identify_goto (decl, locus);
2625 error (" exits OpenMP structured block");
2626 identified = saw_omp = true;
2629 for (b = current_binding_level; b ; b = b->level_chain)
2631 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2633 for (new_decls = b->names; new_decls != old_decls;
2634 new_decls = DECL_CHAIN (new_decls))
2636 int problem = decl_jump_unsafe (new_decls);
2642 identify_goto (decl, locus);
2646 error (" crosses initialization of %q+#D", new_decls);
2648 permerror (input_location, " enters scope of %q+#D which has "
2649 "non-trivial destructor", new_decls);
2654 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2658 identify_goto (decl, locus);
2661 if (b->kind == sk_try)
2662 error (" enters try block");
2664 error (" enters catch block");
2667 if (b->kind == sk_omp && !saw_omp)
2671 identify_goto (decl, locus);
2674 error (" enters OpenMP structured block");
2683 check_previous_goto (tree decl, struct named_label_use_entry *use)
2685 check_previous_goto_1 (decl, use->binding_level,
2686 use->names_in_scope, use->in_omp_scope,
2687 &use->o_goto_locus);
2691 check_switch_goto (struct cp_binding_level* level)
2693 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2696 /* Check that a new jump to a label DECL is OK. Called by
2697 finish_goto_stmt. */
2700 check_goto (tree decl)
2702 struct named_label_entry *ent, dummy;
2703 bool saw_catch = false, identified = false;
2707 /* We can't know where a computed goto is jumping.
2708 So we assume that it's OK. */
2709 if (TREE_CODE (decl) != LABEL_DECL)
2712 /* We didn't record any information about this label when we created it,
2713 and there's not much point since it's trivial to analyze as a return. */
2714 if (decl == cdtor_label)
2717 dummy.label_decl = decl;
2718 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2719 gcc_assert (ent != NULL);
2721 /* If the label hasn't been defined yet, defer checking. */
2722 if (! DECL_INITIAL (decl))
2724 struct named_label_use_entry *new_use;
2726 /* Don't bother creating another use if the last goto had the
2727 same data, and will therefore create the same set of errors. */
2729 && ent->uses->names_in_scope == current_binding_level->names)
2732 new_use = ggc_alloc_named_label_use_entry ();
2733 new_use->binding_level = current_binding_level;
2734 new_use->names_in_scope = current_binding_level->names;
2735 new_use->o_goto_locus = input_location;
2736 new_use->in_omp_scope = false;
2738 new_use->next = ent->uses;
2739 ent->uses = new_use;
2743 if (ent->in_try_scope || ent->in_catch_scope
2744 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2746 permerror (input_location, "jump to label %q+D", decl);
2747 permerror (input_location, " from here");
2751 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2753 int u = decl_jump_unsafe (bad);
2755 if (u > 1 && DECL_ARTIFICIAL (bad))
2757 /* Can't skip init of __exception_info. */
2758 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2762 error (" skips initialization of %q+#D", bad);
2764 permerror (input_location, " enters scope of %q+#D which has "
2765 "non-trivial destructor", bad);
2768 if (ent->in_try_scope)
2769 error (" enters try block");
2770 else if (ent->in_catch_scope && !saw_catch)
2771 error (" enters catch block");
2773 if (ent->in_omp_scope)
2774 error (" enters OpenMP structured block");
2775 else if (flag_openmp)
2777 struct cp_binding_level *b;
2778 for (b = current_binding_level; b ; b = b->level_chain)
2780 if (b == ent->binding_level)
2782 if (b->kind == sk_omp)
2786 permerror (input_location, "jump to label %q+D", decl);
2787 permerror (input_location, " from here");
2790 error (" exits OpenMP structured block");
2797 /* Check that a return is ok wrt OpenMP structured blocks.
2798 Called by finish_return_stmt. Returns true if all is well. */
2801 check_omp_return (void)
2803 struct cp_binding_level *b;
2804 for (b = current_binding_level; b ; b = b->level_chain)
2805 if (b->kind == sk_omp)
2807 error ("invalid exit from OpenMP structured block");
2813 /* Define a label, specifying the location in the source file.
2814 Return the LABEL_DECL node for the label. */
2817 define_label (location_t location, tree name)
2819 struct named_label_entry *ent, dummy;
2820 struct cp_binding_level *p;
2823 timevar_push (TV_NAME_LOOKUP);
2825 decl = lookup_label (name);
2827 dummy.label_decl = decl;
2828 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2829 gcc_assert (ent != NULL);
2831 /* After labels, make any new cleanups in the function go into their
2832 own new (temporary) binding contour. */
2833 for (p = current_binding_level;
2834 p->kind != sk_function_parms;
2836 p->more_cleanups_ok = 0;
2838 if (name == get_identifier ("wchar_t"))
2839 permerror (input_location, "label named wchar_t");
2841 if (DECL_INITIAL (decl) != NULL_TREE)
2843 error ("duplicate label %qD", decl);
2844 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2848 struct named_label_use_entry *use;
2850 /* Mark label as having been defined. */
2851 DECL_INITIAL (decl) = error_mark_node;
2852 /* Say where in the source. */
2853 DECL_SOURCE_LOCATION (decl) = location;
2855 ent->binding_level = current_binding_level;
2856 ent->names_in_scope = current_binding_level->names;
2858 for (use = ent->uses; use ; use = use->next)
2859 check_previous_goto (decl, use);
2863 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2868 struct cp_binding_level *level;
2869 struct cp_switch *next;
2870 /* The SWITCH_STMT being built. */
2872 /* A splay-tree mapping the low element of a case range to the high
2873 element, or NULL_TREE if there is no high element. Used to
2874 determine whether or not a new case label duplicates an old case
2875 label. We need a tree, rather than simply a hash table, because
2876 of the GNU case range extension. */
2880 /* A stack of the currently active switch statements. The innermost
2881 switch statement is on the top of the stack. There is no need to
2882 mark the stack for garbage collection because it is only active
2883 during the processing of the body of a function, and we never
2884 collect at that point. */
2886 static struct cp_switch *switch_stack;
2888 /* Called right after a switch-statement condition is parsed.
2889 SWITCH_STMT is the switch statement being parsed. */
2892 push_switch (tree switch_stmt)
2894 struct cp_switch *p = XNEW (struct cp_switch);
2895 p->level = current_binding_level;
2896 p->next = switch_stack;
2897 p->switch_stmt = switch_stmt;
2898 p->cases = splay_tree_new (case_compare, NULL, NULL);
2905 struct cp_switch *cs = switch_stack;
2906 location_t switch_location;
2908 /* Emit warnings as needed. */
2909 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2910 if (!processing_template_decl)
2911 c_do_switch_warnings (cs->cases, switch_location,
2912 SWITCH_STMT_TYPE (cs->switch_stmt),
2913 SWITCH_STMT_COND (cs->switch_stmt));
2915 splay_tree_delete (cs->cases);
2916 switch_stack = switch_stack->next;
2920 /* Note that we've seen a definition of a case label, and complain if this
2921 is a bad place for one. */
2924 finish_case_label (location_t loc, tree low_value, tree high_value)
2927 struct cp_binding_level *p;
2929 if (processing_template_decl)
2933 /* For templates, just add the case label; we'll do semantic
2934 analysis at instantiation-time. */
2935 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2936 return add_stmt (build_case_label (loc, low_value, high_value, label));
2939 /* Find the condition on which this switch statement depends. */
2940 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2941 if (cond && TREE_CODE (cond) == TREE_LIST)
2942 cond = TREE_VALUE (cond);
2944 if (!check_switch_goto (switch_stack->level))
2945 return error_mark_node;
2948 low_value = cxx_constant_value (low_value);
2950 high_value = cxx_constant_value (high_value);
2952 r = c_add_case_label (loc, switch_stack->cases, cond,
2953 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2954 low_value, high_value);
2956 /* After labels, make any new cleanups in the function go into their
2957 own new (temporary) binding contour. */
2958 for (p = current_binding_level;
2959 p->kind != sk_function_parms;
2961 p->more_cleanups_ok = 0;
2966 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2969 typename_hash (const void* k)
2972 const_tree const t = (const_tree) k;
2974 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2975 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2980 typedef struct typename_info {
2988 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2989 really of type `typename_info*' */
2992 typename_compare (const void * k1, const void * k2)
2994 const_tree const t1 = (const_tree) k1;
2995 const typename_info *const t2 = (const typename_info *) k2;
2997 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2998 && TYPE_CONTEXT (t1) == t2->scope
2999 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3000 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3001 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3004 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3005 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3007 Returns the new TYPENAME_TYPE. */
3009 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3012 build_typename_type (tree context, tree name, tree fullname,
3013 enum tag_types tag_type)
3021 if (typename_htab == NULL)
3022 typename_htab = htab_create_ggc (61, &typename_hash,
3023 &typename_compare, NULL);
3025 ti.scope = FROB_CONTEXT (context);
3027 ti.template_id = fullname;
3028 ti.enum_p = tag_type == enum_type;
3029 ti.class_p = (tag_type == class_type
3030 || tag_type == record_type
3031 || tag_type == union_type);
3032 hash = (htab_hash_pointer (ti.scope)
3033 ^ htab_hash_pointer (ti.name));
3035 /* See if we already have this type. */
3036 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3041 /* Build the TYPENAME_TYPE. */
3042 t = cxx_make_type (TYPENAME_TYPE);
3043 TYPE_CONTEXT (t) = ti.scope;
3044 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3045 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3046 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3048 /* Build the corresponding TYPE_DECL. */
3049 d = build_decl (input_location, TYPE_DECL, name, t);
3050 TYPE_NAME (TREE_TYPE (d)) = d;
3051 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3052 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3053 DECL_ARTIFICIAL (d) = 1;
3055 /* Store it in the hash table. */
3058 /* TYPENAME_TYPEs must always be compared structurally, because
3059 they may or may not resolve down to another type depending on
3060 the currently open classes. */
3061 SET_TYPE_STRUCTURAL_EQUALITY (t);
3067 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3068 provided to name the type. Returns an appropriate type, unless an
3069 error occurs, in which case error_mark_node is returned. If we
3070 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3071 return that, rather than the _TYPE it corresponds to, in other
3072 cases we look through the type decl. If TF_ERROR is set, complain
3073 about errors, otherwise be quiet. */
3076 make_typename_type (tree context, tree name, enum tag_types tag_type,
3077 tsubst_flags_t complain)
3083 if (name == error_mark_node
3084 || context == NULL_TREE
3085 || context == error_mark_node)
3086 return error_mark_node;
3090 if (!(TYPE_LANG_SPECIFIC (name)
3091 && (CLASSTYPE_IS_TEMPLATE (name)
3092 || CLASSTYPE_USE_TEMPLATE (name))))
3093 name = TYPE_IDENTIFIER (name);
3095 /* Create a TEMPLATE_ID_EXPR for the type. */
3096 name = build_nt (TEMPLATE_ID_EXPR,
3097 CLASSTYPE_TI_TEMPLATE (name),
3098 CLASSTYPE_TI_ARGS (name));
3100 else if (TREE_CODE (name) == TYPE_DECL)
3101 name = DECL_NAME (name);
3105 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3107 name = TREE_OPERAND (name, 0);
3108 if (TREE_CODE (name) == TEMPLATE_DECL)
3109 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3110 else if (TREE_CODE (name) == OVERLOAD)
3112 error ("%qD is not a type", name);
3113 return error_mark_node;
3116 if (TREE_CODE (name) == TEMPLATE_DECL)
3118 error ("%qD used without template parameters", name);
3119 return error_mark_node;
3121 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3122 gcc_assert (TYPE_P (context));
3124 if (!MAYBE_CLASS_TYPE_P (context))
3126 if (complain & tf_error)
3127 error ("%q#T is not a class", context);
3128 return error_mark_node;
3131 /* When the CONTEXT is a dependent type, NAME could refer to a
3132 dependent base class of CONTEXT. But look inside it anyway
3133 if CONTEXT is a currently open scope, in case it refers to a
3134 member of the current instantiation or a non-dependent base;
3135 lookup will stop when we hit a dependent base. */
3136 if (!dependent_scope_p (context))
3137 /* We should only set WANT_TYPE when we're a nested typename type.
3138 Then we can give better diagnostics if we find a non-type. */
3139 t = lookup_field (context, name, 2, /*want_type=*/true);
3143 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3144 return build_typename_type (context, name, fullname, tag_type);
3146 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3150 if (complain & tf_error)
3151 error (want_template ? "no class template named %q#T in %q#T"
3152 : "no type named %q#T in %q#T", name, context);
3153 return error_mark_node;
3156 /* Pull out the template from an injected-class-name (or multiple). */
3158 t = maybe_get_template_decl_from_type_decl (t);
3160 if (TREE_CODE (t) == TREE_LIST)
3162 if (complain & tf_error)
3164 error ("lookup of %qT in %qT is ambiguous", name, context);
3165 print_candidates (t);
3167 return error_mark_node;
3170 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3172 if (complain & tf_error)
3173 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3175 return error_mark_node;
3177 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3179 if (complain & tf_error)
3180 error ("%<typename %T::%D%> names %q#T, which is not a type",
3182 return error_mark_node;
3185 if (complain & tf_error)
3186 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3188 /* If we are currently parsing a template and if T is a typedef accessed
3189 through CONTEXT then we need to remember and check access of T at
3190 template instantiation time. */
3191 add_typedef_to_current_template_for_access_check (t, context, input_location);
3194 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3196 /*entering_scope=*/0,
3197 tf_warning_or_error | tf_user);
3199 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3205 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3206 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3207 in which case error_mark_node is returned.
3209 If PARM_LIST is non-NULL, also make sure that the template parameter
3210 list of TEMPLATE_DECL matches.
3212 If COMPLAIN zero, don't complain about any errors that occur. */
3215 make_unbound_class_template (tree context, tree name, tree parm_list,
3216 tsubst_flags_t complain)
3222 name = TYPE_IDENTIFIER (name);
3223 else if (DECL_P (name))
3224 name = DECL_NAME (name);
3225 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3227 if (!dependent_type_p (context)
3228 || currently_open_class (context))
3230 tree tmpl = NULL_TREE;
3232 if (MAYBE_CLASS_TYPE_P (context))
3233 tmpl = lookup_field (context, name, 0, false);
3235 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3236 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3238 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3240 if (complain & tf_error)
3241 error ("no class template named %q#T in %q#T", name, context);
3242 return error_mark_node;
3246 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3248 if (complain & tf_error)
3250 error ("template parameters do not match template");
3251 error ("%q+D declared here", tmpl);
3253 return error_mark_node;
3256 if (complain & tf_error)
3257 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3262 /* Build the UNBOUND_CLASS_TEMPLATE. */
3263 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3264 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3265 TREE_TYPE (t) = NULL_TREE;
3266 SET_TYPE_STRUCTURAL_EQUALITY (t);
3268 /* Build the corresponding TEMPLATE_DECL. */
3269 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3270 TYPE_NAME (TREE_TYPE (d)) = d;
3271 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3272 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3273 DECL_ARTIFICIAL (d) = 1;
3274 DECL_TEMPLATE_PARMS (d) = parm_list;
3281 /* Push the declarations of builtin types into the namespace.
3282 RID_INDEX is the index of the builtin type in the array
3283 RID_POINTERS. NAME is the name used when looking up the builtin
3284 type. TYPE is the _TYPE node for the builtin type. */
3287 record_builtin_type (enum rid rid_index,
3291 tree rname = NULL_TREE, tname = NULL_TREE;
3292 tree tdecl = NULL_TREE;
3294 if ((int) rid_index < (int) RID_MAX)
3295 rname = ridpointers[(int) rid_index];
3297 tname = get_identifier (name);
3299 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3300 eliminated. Built-in types should not be looked up name; their
3301 names are keywords that the parser can recognize. However, there
3302 is code in c-common.c that uses identifier_global_value to look
3303 up built-in types by name. */
3306 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3307 DECL_ARTIFICIAL (tdecl) = 1;
3308 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3314 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3315 DECL_ARTIFICIAL (tdecl) = 1;
3317 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3320 if (!TYPE_NAME (type))
3321 TYPE_NAME (type) = tdecl;
3324 debug_hooks->type_decl (tdecl, 0);
3327 /* Record one of the standard Java types.
3328 * Declare it as having the given NAME.
3329 * If SIZE > 0, it is the size of one of the integral types;
3330 * otherwise it is the negative of the size of one of the other types. */
3333 record_builtin_java_type (const char* name, int size)
3338 type = build_nonstandard_integer_type (size, 0);
3339 type = build_distinct_type_copy (type);
3341 else if (size > -32)
3344 /* "__java_char" or ""__java_boolean". */
3345 type = build_nonstandard_integer_type (-size, 1);
3346 type = build_distinct_type_copy (type);
3347 /* Get the signed type cached and attached to the unsigned type,
3348 so it doesn't get garbage-collected at "random" times,
3349 causing potential codegen differences out of different UIDs
3350 and different alias set numbers. */
3351 stype = build_nonstandard_integer_type (-size, 0);
3352 stype = build_distinct_type_copy (stype);
3353 TREE_CHAIN (type) = stype;
3354 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3357 { /* "__java_float" or ""__java_double". */
3358 type = make_node (REAL_TYPE);
3359 TYPE_PRECISION (type) = - size;
3362 record_builtin_type (RID_MAX, name, type);
3363 decl = TYPE_NAME (type);
3365 /* Suppress generate debug symbol entries for these types,
3366 since for normal C++ they are just clutter.
3367 However, push_lang_context undoes this if extern "Java" is seen. */
3368 DECL_IGNORED_P (decl) = 1;
3370 TYPE_FOR_JAVA (type) = 1;
3374 /* Push a type into the namespace so that the back ends ignore it. */
3377 record_unknown_type (tree type, const char* name)
3379 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3380 TYPE_DECL, get_identifier (name), type));
3381 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3382 DECL_IGNORED_P (decl) = 1;
3383 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3384 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3385 TYPE_ALIGN (type) = 1;
3386 TYPE_USER_ALIGN (type) = 0;
3387 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3390 /* A string for which we should create an IDENTIFIER_NODE at
3393 typedef struct predefined_identifier
3395 /* The name of the identifier. */
3396 const char *const name;
3397 /* The place where the IDENTIFIER_NODE should be stored. */
3399 /* Nonzero if this is the name of a constructor or destructor. */
3400 const int ctor_or_dtor_p;
3401 } predefined_identifier;
3403 /* Create all the predefined identifiers. */
3406 initialize_predefined_identifiers (void)
3408 const predefined_identifier *pid;
3410 /* A table of identifiers to create at startup. */
3411 static const predefined_identifier predefined_identifiers[] = {
3412 { "C++", &lang_name_cplusplus, 0 },
3413 { "C", &lang_name_c, 0 },
3414 { "Java", &lang_name_java, 0 },
3415 /* Some of these names have a trailing space so that it is
3416 impossible for them to conflict with names written by users. */
3417 { "__ct ", &ctor_identifier, 1 },
3418 { "__base_ctor ", &base_ctor_identifier, 1 },
3419 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3420 { "__dt ", &dtor_identifier, 1 },
3421 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3422 { "__base_dtor ", &base_dtor_identifier, 1 },
3423 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3424 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3425 { "nelts", &nelts_identifier, 0 },
3426 { THIS_NAME, &this_identifier, 0 },
3427 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3428 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3429 { "_vptr", &vptr_identifier, 0 },
3430 { "__vtt_parm", &vtt_parm_identifier, 0 },
3431 { "::", &global_scope_name, 0 },
3432 { "std", &std_identifier, 0 },
3436 for (pid = predefined_identifiers; pid->name; ++pid)
3438 *pid->node = get_identifier (pid->name);
3439 if (pid->ctor_or_dtor_p)
3440 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3444 /* Create the predefined scalar types of C,
3445 and some nodes representing standard constants (0, 1, (void *)0).
3446 Initialize the global binding level.
3447 Make definitions for built-in primitive functions. */
3450 cxx_init_decl_processing (void)
3453 tree void_ftype_ptr;
3455 build_common_tree_nodes (flag_signed_char);
3457 /* Create all the identifiers we need. */
3458 initialize_predefined_identifiers ();
3460 /* Create the global variables. */
3461 push_to_top_level ();
3463 current_function_decl = NULL_TREE;
3464 current_binding_level = NULL;
3465 /* Enter the global namespace. */
3466 gcc_assert (global_namespace == NULL_TREE);
3467 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3469 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3470 TREE_PUBLIC (global_namespace) = 1;
3471 begin_scope (sk_namespace, global_namespace);
3473 current_lang_name = NULL_TREE;
3475 if (flag_visibility_ms_compat)
3476 default_visibility = VISIBILITY_HIDDEN;
3479 current_lang_name = lang_name_c;
3481 /* Create the `std' namespace. */
3482 push_namespace (std_identifier);
3483 std_node = current_namespace;
3486 c_common_nodes_and_builtins ();
3488 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3489 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3490 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3491 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3492 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3493 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3494 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3495 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3497 integer_two_node = build_int_cst (NULL_TREE, 2);
3499 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3500 truthvalue_type_node = boolean_type_node;
3501 truthvalue_false_node = boolean_false_node;
3502 truthvalue_true_node = boolean_true_node;
3504 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3505 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3506 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3509 record_builtin_type (RID_MAX, NULL, string_type_node);
3512 delta_type_node = ptrdiff_type_node;
3513 vtable_index_type = ptrdiff_type_node;
3515 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3516 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3517 void_ftype_ptr = build_function_type_list (void_type_node,
3518 ptr_type_node, NULL_TREE);
3520 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3522 /* C++ extensions */
3524 unknown_type_node = make_node (LANG_TYPE);
3525 record_unknown_type (unknown_type_node, "unknown type");
3527 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3528 TREE_TYPE (unknown_type_node) = unknown_type_node;
3530 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3532 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3533 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3535 init_list_type_node = make_node (LANG_TYPE);
3536 record_unknown_type (init_list_type_node, "init list");
3539 /* Make sure we get a unique function type, so we can give
3540 its pointer type a name. (This wins for gdb.) */
3541 tree vfunc_type = make_node (FUNCTION_TYPE);
3542 TREE_TYPE (vfunc_type) = integer_type_node;
3543 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3544 layout_type (vfunc_type);
3546 vtable_entry_type = build_pointer_type (vfunc_type);
3548 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3551 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3552 layout_type (vtbl_type_node);
3553 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3554 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3555 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3556 layout_type (vtbl_ptr_type_node);
3557 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3559 push_namespace (get_identifier ("__cxxabiv1"));
3560 abi_node = current_namespace;
3563 global_type_node = make_node (LANG_TYPE);
3564 record_unknown_type (global_type_node, "global type");
3567 current_lang_name = lang_name_cplusplus;
3570 tree newtype, deltype;
3571 tree ptr_ftype_sizetype;
3575 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3576 if (cxx_dialect == cxx98)
3579 tree bad_alloc_type_node;
3580 tree bad_alloc_decl;
3582 push_namespace (std_identifier);
3583 bad_alloc_id = get_identifier ("bad_alloc");
3584 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3585 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3587 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3588 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3592 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3595 new_eh_spec = noexcept_false_spec;
3597 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3598 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3599 push_cp_library_fn (NEW_EXPR, newtype);
3600 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3601 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3602 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3604 nullptr_type_node = make_node (NULLPTR_TYPE);
3605 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3606 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3607 TYPE_UNSIGNED (nullptr_type_node) = 1;
3608 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3609 SET_TYPE_MODE (nullptr_type_node, Pmode);
3610 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3611 nullptr_node = build_int_cst (nullptr_type_node, 0);
3615 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3617 /* Perform other language dependent initializations. */
3618 init_class_processing ();
3619 init_rtti_processing ();
3620 init_template_processing ();
3622 if (flag_exceptions)
3623 init_exception_processing ();
3625 if (! supports_one_only ())
3628 make_fname_decl = cp_make_fname_decl;
3629 start_fname_decls ();
3631 /* Show we use EH for cleanups. */
3632 if (flag_exceptions)
3633 using_eh_for_cleanups ();
3636 /* Generate an initializer for a function naming variable from
3637 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3638 filled in with the type of the init. */
3641 cp_fname_init (const char* name, tree *type_p)
3643 tree domain = NULL_TREE;
3645 tree init = NULL_TREE;
3650 length = strlen (name);
3651 domain = build_index_type (size_int (length));
3652 init = build_string (length + 1, name);
3655 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3656 type = build_cplus_array_type (type, domain);
3661 TREE_TYPE (init) = type;
3663 init = error_mark_node;
3668 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3669 the decl, LOC is the location to give the decl, NAME is the
3670 initialization string and TYPE_DEP indicates whether NAME depended
3671 on the type of the function. We make use of that to detect
3672 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3673 at the point of first use, so we mustn't push the decl now. */
3676 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3678 const char *const name = (type_dep && processing_template_decl
3679 ? NULL : fname_as_string (type_dep));
3681 tree init = cp_fname_init (name, &type);
3682 tree decl = build_decl (loc, VAR_DECL, id, type);
3685 free (CONST_CAST (char *, name));
3687 /* As we're using pushdecl_with_scope, we must set the context. */
3688 DECL_CONTEXT (decl) = current_function_decl;
3689 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3691 TREE_STATIC (decl) = 1;
3692 TREE_READONLY (decl) = 1;
3693 DECL_ARTIFICIAL (decl) = 1;
3695 TREE_USED (decl) = 1;
3697 if (current_function_decl)
3699 struct cp_binding_level *b = current_binding_level;
3700 if (b->kind == sk_function_parms)
3701 return error_mark_node;
3702 while (b->level_chain->kind != sk_function_parms)
3704 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3705 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3706 LOOKUP_ONLYCONVERTING);
3710 DECL_THIS_STATIC (decl) = true;
3711 pushdecl_top_level_and_finish (decl, init);
3718 builtin_function_1 (tree decl, tree context, bool is_global)
3720 tree id = DECL_NAME (decl);
3721 const char *name = IDENTIFIER_POINTER (id);
3723 retrofit_lang_decl (decl);
3725 DECL_ARTIFICIAL (decl) = 1;
3726 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3727 SET_DECL_LANGUAGE (decl, lang_c);
3728 /* Runtime library routines are, by definition, available in an
3729 external shared object. */
3730 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3731 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3733 DECL_CONTEXT (decl) = context;
3736 pushdecl_top_level (decl);
3740 /* A function in the user's namespace should have an explicit
3741 declaration before it is used. Mark the built-in function as
3742 anticipated but not actually declared. */
3743 if (name[0] != '_' || name[1] != '_')
3744 DECL_ANTICIPATED (decl) = 1;
3745 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3747 size_t len = strlen (name);
3749 /* Treat __*_chk fortification functions as anticipated as well,
3750 unless they are __builtin_*. */
3751 if (len > strlen ("___chk")
3752 && memcmp (name + len - strlen ("_chk"),
3753 "_chk", strlen ("_chk") + 1) == 0)
3754 DECL_ANTICIPATED (decl) = 1;
3761 cxx_builtin_function (tree decl)
3763 tree id = DECL_NAME (decl);
3764 const char *name = IDENTIFIER_POINTER (id);
3765 /* All builtins that don't begin with an '_' should additionally
3766 go in the 'std' namespace. */
3769 tree decl2 = copy_node(decl);
3770 push_namespace (std_identifier);
3771 builtin_function_1 (decl2, std_node, false);
3775 return builtin_function_1 (decl, NULL_TREE, false);
3778 /* Like cxx_builtin_function, but guarantee the function is added to the global
3779 scope. This is to allow function specific options to add new machine
3780 dependent builtins when the target ISA changes via attribute((target(...)))
3781 which saves space on program startup if the program does not use non-generic
3785 cxx_builtin_function_ext_scope (tree decl)
3788 tree id = DECL_NAME (decl);
3789 const char *name = IDENTIFIER_POINTER (id);
3790 /* All builtins that don't begin with an '_' should additionally
3791 go in the 'std' namespace. */
3794 tree decl2 = copy_node(decl);
3795 push_namespace (std_identifier);
3796 builtin_function_1 (decl2, std_node, true);
3800 return builtin_function_1 (decl, NULL_TREE, true);
3803 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3804 function. Not called directly. */
3807 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3809 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3810 DECL_EXTERNAL (fn) = 1;
3811 TREE_PUBLIC (fn) = 1;
3812 DECL_ARTIFICIAL (fn) = 1;
3813 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3814 SET_DECL_LANGUAGE (fn, lang_c);
3815 /* Runtime library routines are, by definition, available in an
3816 external shared object. */
3817 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3818 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3822 /* Returns the _DECL for a library function with C linkage.
3823 We assume that such functions never throw; if this is incorrect,
3824 callers should unset TREE_NOTHROW. */
3827 build_library_fn (tree name, tree type)
3829 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3830 TREE_NOTHROW (fn) = 1;
3834 /* Returns the _DECL for a library function with C++ linkage. */
3837 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3839 tree fn = build_library_fn_1 (name, operator_code, type);
3840 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3841 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3842 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3846 /* Like build_library_fn, but takes a C string instead of an
3850 build_library_fn_ptr (const char* name, tree type)
3852 return build_library_fn (get_identifier (name), type);
3855 /* Like build_cp_library_fn, but takes a C string instead of an
3859 build_cp_library_fn_ptr (const char* name, tree type)
3861 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3864 /* Like build_library_fn, but also pushes the function so that we will
3865 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3866 may throw exceptions listed in RAISES. */
3869 push_library_fn (tree name, tree type, tree raises)
3874 type = build_exception_variant (type, raises);
3876 fn = build_library_fn (name, type);
3877 pushdecl_top_level (fn);
3881 /* Like build_cp_library_fn, but also pushes the function so that it
3882 will be found by normal lookup. */
3885 push_cp_library_fn (enum tree_code operator_code, tree type)
3887 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3894 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3898 push_void_library_fn (tree name, tree parmtypes)
3900 tree type = build_function_type (void_type_node, parmtypes);
3901 return push_library_fn (name, type, NULL_TREE);
3904 /* Like push_library_fn, but also note that this function throws
3905 and does not return. Used for __throw_foo and the like. */
3908 push_throw_library_fn (tree name, tree type)
3910 tree fn = push_library_fn (name, type, NULL_TREE);
3911 TREE_THIS_VOLATILE (fn) = 1;
3912 TREE_NOTHROW (fn) = 0;
3916 /* When we call finish_struct for an anonymous union, we create
3917 default copy constructors and such. But, an anonymous union
3918 shouldn't have such things; this function undoes the damage to the
3919 anonymous union type T.
3921 (The reason that we create the synthesized methods is that we don't
3922 distinguish `union { int i; }' from `typedef union { int i; } U'.
3923 The first is an anonymous union; the second is just an ordinary
3927 fixup_anonymous_aggr (tree t)
3931 /* Wipe out memory of synthesized methods. */
3932 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3933 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3934 TYPE_HAS_COPY_CTOR (t) = 0;
3935 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3936 TYPE_HAS_COPY_ASSIGN (t) = 0;
3937 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3939 /* Splice the implicitly generated functions out of the TYPE_METHODS
3941 q = &TYPE_METHODS (t);
3944 if (DECL_ARTIFICIAL (*q))
3945 *q = TREE_CHAIN (*q);
3947 q = &DECL_CHAIN (*q);
3950 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3951 if (TYPE_METHODS (t))
3953 tree decl = TYPE_MAIN_DECL (t);
3955 if (TREE_CODE (t) != UNION_TYPE)
3956 error_at (DECL_SOURCE_LOCATION (decl),
3957 "an anonymous struct cannot have function members");
3959 error_at (DECL_SOURCE_LOCATION (decl),
3960 "an anonymous union cannot have function members");
3963 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3964 assignment operators (because they cannot have these methods themselves).
3965 For anonymous unions this is already checked because they are not allowed
3966 in any union, otherwise we have to check it. */
3967 if (TREE_CODE (t) != UNION_TYPE)
3971 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3972 if (TREE_CODE (field) == FIELD_DECL)
3974 type = TREE_TYPE (field);
3975 if (CLASS_TYPE_P (type))
3977 if (TYPE_NEEDS_CONSTRUCTING (type))
3978 error ("member %q+#D with constructor not allowed "
3979 "in anonymous aggregate", field);
3980 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3981 error ("member %q+#D with destructor not allowed "
3982 "in anonymous aggregate", field);
3983 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3984 error ("member %q+#D with copy assignment operator "
3985 "not allowed in anonymous aggregate", field);
3991 /* Make sure that a declaration with no declarator is well-formed, i.e.
3992 just declares a tagged type or anonymous union.
3994 Returns the type declared; or NULL_TREE if none. */
3997 check_tag_decl (cp_decl_specifier_seq *declspecs)
3999 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4000 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4001 /* If a class, struct, or enum type is declared by the DECLSPECS
4002 (i.e, if a class-specifier, enum-specifier, or non-typename
4003 elaborated-type-specifier appears in the DECLSPECS),
4004 DECLARED_TYPE is set to the corresponding type. */
4005 tree declared_type = NULL_TREE;
4006 bool error_p = false;
4008 if (declspecs->multiple_types_p)
4009 error ("multiple types in one declaration");
4010 else if (declspecs->redefined_builtin_type)
4012 if (!in_system_header)
4013 permerror (input_location, "redeclaration of C++ built-in type %qT",
4014 declspecs->redefined_builtin_type);
4019 && TYPE_P (declspecs->type)
4020 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4021 && MAYBE_CLASS_TYPE_P (declspecs->type))
4022 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4023 declared_type = declspecs->type;
4024 else if (declspecs->type == error_mark_node)
4026 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4027 permerror (input_location, "declaration does not declare anything");
4028 /* Check for an anonymous union. */
4029 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4030 && TYPE_ANONYMOUS_P (declared_type))
4032 /* 7/3 In a simple-declaration, the optional init-declarator-list
4033 can be omitted only when declaring a class (clause 9) or
4034 enumeration (7.2), that is, when the decl-specifier-seq contains
4035 either a class-specifier, an elaborated-type-specifier with
4036 a class-key (9.1), or an enum-specifier. In these cases and
4037 whenever a class-specifier or enum-specifier is present in the
4038 decl-specifier-seq, the identifiers in these specifiers are among
4039 the names being declared by the declaration (as class-name,
4040 enum-names, or enumerators, depending on the syntax). In such
4041 cases, and except for the declaration of an unnamed bit-field (9.6),
4042 the decl-specifier-seq shall introduce one or more names into the
4043 program, or shall redeclare a name introduced by a previous
4044 declaration. [Example:
4045 enum { }; // ill-formed
4046 typedef class { }; // ill-formed
4050 error ("missing type-name in typedef-declaration");
4053 /* Anonymous unions are objects, so they can have specifiers. */;
4054 SET_ANON_AGGR_TYPE_P (declared_type);
4056 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4057 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4062 if (declspecs->specs[(int)ds_inline]
4063 || declspecs->specs[(int)ds_virtual])
4064 error ("%qs can only be specified for functions",
4065 declspecs->specs[(int)ds_inline]
4066 ? "inline" : "virtual");
4068 && (!current_class_type
4069 || current_scope () != current_class_type))
4070 error ("%<friend%> can only be specified inside a class");
4071 else if (declspecs->specs[(int)ds_explicit])
4072 error ("%<explicit%> can only be specified for constructors");
4073 else if (declspecs->storage_class)
4074 error ("a storage class can only be specified for objects "
4076 else if (declspecs->specs[(int)ds_const]
4077 || declspecs->specs[(int)ds_volatile]
4078 || declspecs->specs[(int)ds_restrict]
4079 || declspecs->specs[(int)ds_thread])
4080 error ("qualifiers can only be specified for objects "
4082 else if (saw_typedef)
4083 warning (0, "%<typedef%> was ignored in this declaration");
4084 else if (declspecs->specs[(int) ds_constexpr])
4085 error ("%<constexpr%> cannot be used for type declarations");
4088 return declared_type;
4091 /* Called when a declaration is seen that contains no names to declare.
4092 If its type is a reference to a structure, union or enum inherited
4093 from a containing scope, shadow that tag name for the current scope
4094 with a forward reference.
4095 If its type defines a new named structure or union
4096 or defines an enum, it is valid but we need not do anything here.
4097 Otherwise, it is an error.
4099 C++: may have to grok the declspecs to learn about static,
4100 complain for anonymous unions.
4102 Returns the TYPE declared -- or NULL_TREE if none. */
4105 shadow_tag (cp_decl_specifier_seq *declspecs)
4107 tree t = check_tag_decl (declspecs);
4112 if (declspecs->attributes)
4114 warning (0, "attribute ignored in declaration of %q+#T", t);
4115 warning (0, "attribute for %q+#T must follow the %qs keyword",
4116 t, class_key_or_enum_as_string (t));
4120 if (maybe_process_partial_specialization (t) == error_mark_node)
4123 /* This is where the variables in an anonymous union are
4124 declared. An anonymous union declaration looks like:
4126 because there is no declarator after the union, the parser
4127 sends that declaration here. */
4128 if (ANON_AGGR_TYPE_P (t))
4130 fixup_anonymous_aggr (t);
4132 if (TYPE_FIELDS (t))
4134 tree decl = grokdeclarator (/*declarator=*/NULL,
4135 declspecs, NORMAL, 0, NULL);
4136 finish_anon_union (decl);
4143 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4146 groktypename (cp_decl_specifier_seq *type_specifiers,
4147 const cp_declarator *declarator,
4148 bool is_template_arg)
4152 enum decl_context context
4153 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4154 attrs = type_specifiers->attributes;
4155 type_specifiers->attributes = NULL_TREE;
4156 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4157 if (attrs && type != error_mark_node)
4159 if (CLASS_TYPE_P (type))
4160 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4161 "outside of definition", type);
4162 else if (MAYBE_CLASS_TYPE_P (type))
4163 /* A template type parameter or other dependent type. */
4164 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4165 "type %qT without an associated declaration", type);
4167 cplus_decl_attributes (&type, attrs, 0);
4172 /* Process a DECLARATOR for a function-scope variable declaration,
4173 namespace-scope variable declaration, or function declaration.
4174 (Function definitions go through start_function; class member
4175 declarations appearing in the body of the class go through
4176 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4177 If an error occurs, the error_mark_node is returned instead.
4179 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4180 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4181 for an explicitly defaulted function, or SD_DELETED for an explicitly
4182 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4183 implicitly initialized via a default constructor. ATTRIBUTES and
4184 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4185 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4186 set, the caller is responsible for calling pop_scope. */
4189 start_decl (const cp_declarator *declarator,
4190 cp_decl_specifier_seq *declspecs,
4193 tree prefix_attributes,
4194 tree *pushed_scope_p)
4202 *pushed_scope_p = NULL_TREE;
4204 /* An object declared as __attribute__((deprecated)) suppresses
4205 warnings of uses of other deprecated items. */
4206 if (lookup_attribute ("deprecated", attributes))
4207 deprecated_state = DEPRECATED_SUPPRESS;
4209 attributes = chainon (attributes, prefix_attributes);
4211 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4214 deprecated_state = DEPRECATED_NORMAL;
4216 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4217 || decl == error_mark_node)
4218 return error_mark_node;
4220 context = CP_DECL_CONTEXT (decl);
4221 if (context != global_namespace)
4222 *pushed_scope_p = push_scope (context);
4225 /* Is it valid for this decl to have an initializer at all?
4226 If not, set INITIALIZED to zero, which will indirectly
4227 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4228 switch (TREE_CODE (decl))
4231 error ("typedef %qD is initialized (use decltype instead)", decl);
4232 return error_mark_node;
4235 if (initialized == SD_DELETED)
4236 /* We'll handle the rest of the semantics later, but we need to
4237 set this now so it's visible to duplicate_decls. */
4238 DECL_DELETED_FN (decl) = 1;
4247 if (! toplevel_bindings_p ()
4248 && DECL_EXTERNAL (decl))
4249 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4251 DECL_EXTERNAL (decl) = 0;
4252 if (toplevel_bindings_p ())
4253 TREE_STATIC (decl) = 1;
4255 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4257 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4258 record_key_method_defined (decl);
4260 /* If this is a typedef that names the class for linkage purposes
4261 (7.1.3p8), apply any attributes directly to the type. */
4262 if (TREE_CODE (decl) == TYPE_DECL
4263 && TAGGED_TYPE_P (TREE_TYPE (decl))
4264 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4265 flags = ATTR_FLAG_TYPE_IN_PLACE;
4269 /* Set attributes here so if duplicate decl, will have proper attributes. */
4270 cplus_decl_attributes (&decl, attributes, flags);
4272 /* Dllimported symbols cannot be defined. Static data members (which
4273 can be initialized in-class and dllimported) go through grokfield,
4274 not here, so we don't need to exclude those decls when checking for
4276 if (initialized && DECL_DLLIMPORT_P (decl))
4278 error ("definition of %q#D is marked %<dllimport%>", decl);
4279 DECL_DLLIMPORT_P (decl) = 0;
4282 /* If #pragma weak was used, mark the decl weak now. */
4283 maybe_apply_pragma_weak (decl);
4285 if (TREE_CODE (decl) == FUNCTION_DECL
4286 && DECL_DECLARED_INLINE_P (decl)
4287 && DECL_UNINLINABLE (decl)
4288 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4289 warning (0, "inline function %q+D given attribute noinline", decl);
4291 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4293 if (TREE_CODE (decl) == VAR_DECL)
4295 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4296 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4297 error ("%q#D is not a static member of %q#T", decl, context);
4300 if (DECL_CONTEXT (field) != context)
4302 if (!same_type_p (DECL_CONTEXT (field), context))
4303 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4304 "to be defined as %<%T::%D%>",
4305 DECL_CONTEXT (field), DECL_NAME (decl),
4306 context, DECL_NAME (decl));
4307 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4309 if (processing_specialization
4310 && template_class_depth (context) == 0
4311 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4312 error ("template header not allowed in member definition "
4313 "of explicitly specialized class");
4314 /* Static data member are tricky; an in-class initialization
4315 still doesn't provide a definition, so the in-class
4316 declaration will have DECL_EXTERNAL set, but will have an
4317 initialization. Thus, duplicate_decls won't warn
4318 about this situation, and so we check here. */
4319 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4320 error ("duplicate initialization of %qD", decl);
4321 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4323 if (declspecs->specs[(int) ds_constexpr]
4324 && !DECL_DECLARED_CONSTEXPR_P (field))
4325 error ("%qD declared %<constexpr%> outside its class", field);
4330 tree field = check_classfn (context, decl,
4331 (processing_template_decl
4332 > template_class_depth (context))
4333 ? current_template_parms
4335 if (field && field != error_mark_node
4336 && duplicate_decls (decl, field,
4337 /*newdecl_is_friend=*/false))
4341 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4342 DECL_IN_AGGR_P (decl) = 0;
4343 /* Do not mark DECL as an explicit specialization if it was not
4344 already marked as an instantiation; a declaration should
4345 never be marked as a specialization unless we know what
4346 template is being specialized. */
4347 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4349 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4351 /* [temp.expl.spec] An explicit specialization of a static data
4352 member of a template is a definition if the declaration
4353 includes an initializer; otherwise, it is a declaration.
4355 We check for processing_specialization so this only applies
4356 to the new specialization syntax. */
4357 if (!initialized && processing_specialization)
4358 DECL_EXTERNAL (decl) = 1;
4361 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4362 /* Aliases are definitions. */
4364 permerror (input_location, "declaration of %q#D outside of class is not definition",
4368 was_public = TREE_PUBLIC (decl);
4370 /* Enter this declaration into the symbol table. */
4371 decl = maybe_push_decl (decl);
4373 if (processing_template_decl)
4374 decl = push_template_decl (decl);
4375 if (decl == error_mark_node)
4376 return error_mark_node;
4378 /* Tell the back end to use or not use .common as appropriate. If we say
4379 -fconserve-space, we want this to save .data space, at the expense of
4380 wrong semantics. If we say -fno-conserve-space, we want this to
4381 produce errors about redefs; to do this we force variables into the
4383 if (flag_conserve_space
4384 && TREE_CODE (decl) == VAR_DECL
4385 && TREE_PUBLIC (decl)
4386 && !DECL_THREAD_LOCAL_P (decl)
4387 && !have_global_bss_p ())
4388 DECL_COMMON (decl) = 1;
4390 if (TREE_CODE (decl) == VAR_DECL
4391 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4392 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4394 /* This is a const variable with implicit 'static'. Set
4395 DECL_THIS_STATIC so we can tell it from variables that are
4396 !TREE_PUBLIC because of the anonymous namespace. */
4397 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4398 DECL_THIS_STATIC (decl) = 1;
4401 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4402 start_decl_1 (decl, initialized);
4407 /* Process the declaration of a variable DECL. INITIALIZED is true
4408 iff DECL is explicitly initialized. (INITIALIZED is false if the
4409 variable is initialized via an implicitly-called constructor.)
4410 This function must be called for ordinary variables (including, for
4411 example, implicit instantiations of templates), but must not be
4412 called for template declarations. */
4415 start_decl_1 (tree decl, bool initialized)
4419 bool aggregate_definition_p;
4421 gcc_assert (!processing_template_decl);
4423 if (error_operand_p (decl))
4426 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4428 type = TREE_TYPE (decl);
4429 complete_p = COMPLETE_TYPE_P (type);
4430 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4432 /* If an explicit initializer is present, or if this is a definition
4433 of an aggregate, then we need a complete type at this point.
4434 (Scalars are always complete types, so there is nothing to
4435 check.) This code just sets COMPLETE_P; errors (if necessary)
4436 are issued below. */
4437 if ((initialized || aggregate_definition_p)
4439 && COMPLETE_TYPE_P (complete_type (type)))
4442 /* We will not yet have set TREE_READONLY on DECL if the type
4443 was "const", but incomplete, before this point. But, now, we
4444 have a complete type, so we can try again. */
4445 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4449 /* Is it valid for this decl to have an initializer at all? */
4451 /* Don't allow initializations for incomplete types except for
4452 arrays which might be completed by the initialization. */
4454 ; /* A complete type is ok. */
4455 else if (type_uses_auto (type))
4456 ; /* An auto type is ok. */
4457 else if (TREE_CODE (type) != ARRAY_TYPE)
4459 error ("variable %q#D has initializer but incomplete type", decl);
4460 type = TREE_TYPE (decl) = error_mark_node;
4462 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4464 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4465 error ("elements of array %q#D have incomplete type", decl);
4466 /* else we already gave an error in start_decl. */
4469 else if (aggregate_definition_p && !complete_p)
4471 if (type_uses_auto (type))
4472 error ("declaration of %q#D has no initializer", decl);
4474 error ("aggregate %q#D has incomplete type and cannot be defined",
4476 /* Change the type so that assemble_variable will give
4477 DECL an rtl we can live with: (mem (const_int 0)). */
4478 type = TREE_TYPE (decl) = error_mark_node;
4481 /* Create a new scope to hold this declaration if necessary.
4482 Whether or not a new scope is necessary cannot be determined
4483 until after the type has been completed; if the type is a
4484 specialization of a class template it is not until after
4485 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4486 will be set correctly. */
4487 maybe_push_cleanup_level (type);
4490 /* Handle initialization of references. DECL, TYPE, and INIT have the
4491 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4492 but will be set to a new CLEANUP_STMT if a temporary is created
4493 that must be destroyed subsequently.
4495 Returns an initializer expression to use to initialize DECL, or
4496 NULL if the initialization can be performed statically.
4498 Quotes on semantics can be found in ARM 8.4.3. */
4501 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4505 if (init == NULL_TREE)
4507 if ((DECL_LANG_SPECIFIC (decl) == 0
4508 || DECL_IN_AGGR_P (decl) == 0)
4509 && ! DECL_THIS_EXTERN (decl))
4510 error ("%qD declared as reference but not initialized", decl);
4514 if (TREE_CODE (init) == TREE_LIST)
4515 init = build_x_compound_expr_from_list (init, ELK_INIT,
4516 tf_warning_or_error);
4518 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4519 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4520 /* Note: default conversion is only called in very special cases. */
4521 init = decay_conversion (init);
4523 /* Convert INIT to the reference type TYPE. This may involve the
4524 creation of a temporary, whose lifetime must be the same as that
4525 of the reference. If so, a DECL_EXPR for the temporary will be
4526 added just after the DECL_EXPR for DECL. That's why we don't set
4527 DECL_INITIAL for local references (instead assigning to them
4528 explicitly); we need to allow the temporary to be initialized
4530 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4532 if (tmp == error_mark_node)
4534 else if (tmp == NULL_TREE)
4536 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4540 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4543 DECL_INITIAL (decl) = tmp;
4548 /* Subroutine of check_initializer. We're initializing a DECL of
4549 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4550 extend the lifetime of the underlying array to match that of the decl,
4551 just like for reference initialization. CLEANUP is as for
4552 grok_reference_init. */
4555 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4558 tree aggr_init, array, arrtype;
4559 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4560 if (error_operand_p (init))
4561 return error_mark_node;
4563 aggr_init = TARGET_EXPR_INITIAL (init);
4564 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4565 arrtype = TREE_TYPE (array);
4567 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4568 array = TREE_OPERAND (array, 0);
4569 /* If the array is constant, finish_compound_literal already made it a
4570 static variable and we don't need to do anything here. */
4571 if (decl && TREE_CODE (array) == TARGET_EXPR)
4573 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4574 var = build_address (var);
4575 var = convert (arrtype, var);
4576 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4581 /* Designated initializers in arrays are not supported in GNU C++.
4582 The parser cannot detect this error since it does not know whether
4583 a given brace-enclosed initializer is for a class type or for an
4584 array. This function checks that CE does not use a designated
4585 initializer. If it does, an error is issued. Returns true if CE
4586 is valid, i.e., does not have a designated initializer. */
4589 check_array_designated_initializer (const constructor_elt *ce)
4591 /* Designated initializers for array elements are not supported. */
4594 /* The parser only allows identifiers as designated
4596 if (ce->index == error_mark_node)
4597 error ("name used in a GNU-style designated "
4598 "initializer for an array");
4601 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4602 error ("name %qD used in a GNU-style designated "
4603 "initializer for an array", ce->index);
4611 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4612 array until we finish parsing the initializer. If that's the
4613 situation we're in, update DECL accordingly. */
4616 maybe_deduce_size_from_array_init (tree decl, tree init)
4618 tree type = TREE_TYPE (decl);
4620 if (TREE_CODE (type) == ARRAY_TYPE
4621 && TYPE_DOMAIN (type) == NULL_TREE
4622 && TREE_CODE (decl) != TYPE_DECL)
4624 /* do_default is really a C-ism to deal with tentative definitions.
4625 But let's leave it here to ease the eventual merge. */
4626 int do_default = !DECL_EXTERNAL (decl);
4627 tree initializer = init ? init : DECL_INITIAL (decl);
4630 /* Check that there are no designated initializers in INIT, as
4631 those are not supported in GNU C++, and as the middle-end
4632 will crash if presented with a non-numeric designated
4634 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4636 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4637 constructor_elt *ce;
4639 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4640 if (!check_array_designated_initializer (ce))
4646 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4650 error ("initializer fails to determine size of %qD", decl);
4651 TREE_TYPE (decl) = error_mark_node;
4653 else if (failure == 2)
4657 error ("array size missing in %qD", decl);
4658 TREE_TYPE (decl) = error_mark_node;
4660 /* If a `static' var's size isn't known, make it extern as
4661 well as static, so it does not get allocated. If it's not
4662 `static', then don't mark it extern; finish_incomplete_decl
4663 will give it a default size and it will get allocated. */
4664 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4665 DECL_EXTERNAL (decl) = 1;
4667 else if (failure == 3)
4669 error ("zero-size array %qD", decl);
4670 TREE_TYPE (decl) = error_mark_node;
4674 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4676 relayout_decl (decl);
4680 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4681 any appropriate error messages regarding the layout. */
4684 layout_var_decl (tree decl)
4688 type = TREE_TYPE (decl);
4689 if (type == error_mark_node)
4692 /* If we haven't already layed out this declaration, do so now.
4693 Note that we must not call complete type for an external object
4694 because it's type might involve templates that we are not
4695 supposed to instantiate yet. (And it's perfectly valid to say
4696 `extern X x' for some incomplete type `X'.) */
4697 if (!DECL_EXTERNAL (decl))
4698 complete_type (type);
4699 if (!DECL_SIZE (decl)
4700 && TREE_TYPE (decl) != error_mark_node
4701 && (COMPLETE_TYPE_P (type)
4702 || (TREE_CODE (type) == ARRAY_TYPE
4703 && !TYPE_DOMAIN (type)
4704 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4705 layout_decl (decl, 0);
4707 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4709 /* An automatic variable with an incomplete type: that is an error.
4710 Don't talk about array types here, since we took care of that
4711 message in grokdeclarator. */
4712 error ("storage size of %qD isn%'t known", decl);
4713 TREE_TYPE (decl) = error_mark_node;
4716 /* Keep this code around in case we later want to control debug info
4717 based on whether a type is "used". (jason 1999-11-11) */
4719 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4720 /* Let debugger know it should output info for this type. */
4721 note_debug_info_needed (ttype);
4723 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4724 note_debug_info_needed (DECL_CONTEXT (decl));
4727 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4728 && DECL_SIZE (decl) != NULL_TREE
4729 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4731 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4732 constant_expression_warning (DECL_SIZE (decl));
4735 error ("storage size of %qD isn%'t constant", decl);
4736 TREE_TYPE (decl) = error_mark_node;
4741 /* If a local static variable is declared in an inline function, or if
4742 we have a weak definition, we must endeavor to create only one
4743 instance of the variable at link-time. */
4746 maybe_commonize_var (tree decl)
4748 /* Static data in a function with comdat linkage also has comdat
4750 if (TREE_STATIC (decl)
4751 /* Don't mess with __FUNCTION__. */
4752 && ! DECL_ARTIFICIAL (decl)
4753 && DECL_FUNCTION_SCOPE_P (decl)
4754 && vague_linkage_p (DECL_CONTEXT (decl)))
4758 /* With weak symbols, we simply make the variable COMDAT;
4759 that will cause copies in multiple translations units to
4761 comdat_linkage (decl);
4765 if (DECL_INITIAL (decl) == NULL_TREE
4766 || DECL_INITIAL (decl) == error_mark_node)
4768 /* Without weak symbols, we can use COMMON to merge
4769 uninitialized variables. */
4770 TREE_PUBLIC (decl) = 1;
4771 DECL_COMMON (decl) = 1;
4775 /* While for initialized variables, we must use internal
4776 linkage -- which means that multiple copies will not
4778 TREE_PUBLIC (decl) = 0;
4779 DECL_COMMON (decl) = 0;
4780 warning_at (input_location, 0,
4781 "sorry: semantics of inline function static "
4782 "data %q+#D are wrong (you%'ll wind up "
4783 "with multiple copies)", decl);
4784 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4785 " you can work around this by removing "
4790 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4791 /* Set it up again; we might have set DECL_INITIAL since the last
4793 comdat_linkage (decl);
4796 /* Issue an error message if DECL is an uninitialized const variable. */
4799 check_for_uninitialized_const_var (tree decl)
4801 tree type = strip_array_types (TREE_TYPE (decl));
4803 /* ``Unless explicitly declared extern, a const object does not have
4804 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4806 if (TREE_CODE (decl) == VAR_DECL
4807 && TREE_CODE (type) != REFERENCE_TYPE
4808 && CP_TYPE_CONST_P (type)
4809 && (!TYPE_NEEDS_CONSTRUCTING (type)
4810 || !type_has_user_provided_default_constructor (type))
4811 && !DECL_INITIAL (decl))
4813 permerror (DECL_SOURCE_LOCATION (decl),
4814 "uninitialized const %qD", decl);
4816 if (CLASS_TYPE_P (type)
4817 && !type_has_user_provided_default_constructor (type))
4819 tree defaulted_ctor;
4821 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4822 "%q#T has no user-provided default constructor", type);
4823 defaulted_ctor = in_class_defaulted_default_constructor (type);
4825 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4826 "constructor is not user-provided because it is "
4827 "explicitly defaulted in the class body");
4832 /* Structure holding the current initializer being processed by reshape_init.
4833 CUR is a pointer to the current element being processed, END is a pointer
4834 after the last element present in the initializer. */
4835 typedef struct reshape_iterator_t
4837 constructor_elt *cur;
4838 constructor_elt *end;
4841 static tree reshape_init_r (tree, reshape_iter *, bool);
4843 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4844 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4845 initialized. If there are no more such fields, the return value
4849 next_initializable_field (tree field)
4852 && (TREE_CODE (field) != FIELD_DECL
4853 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4854 || DECL_ARTIFICIAL (field)))
4855 field = DECL_CHAIN (field);
4860 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4861 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4862 INTEGER_CST representing the size of the array minus one (the maximum index),
4863 or NULL_TREE if the array was declared without specifying the size. D is
4864 the iterator within the constructor. */
4867 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4870 bool sized_array_p = (max_index != NULL_TREE);
4871 unsigned HOST_WIDE_INT max_index_cst = 0;
4872 unsigned HOST_WIDE_INT index;
4874 /* The initializer for an array is always a CONSTRUCTOR. */
4875 new_init = build_constructor (init_list_type_node, NULL);
4879 /* Minus 1 is used for zero sized arrays. */
4880 if (integer_all_onesp (max_index))
4883 if (host_integerp (max_index, 1))
4884 max_index_cst = tree_low_cst (max_index, 1);
4885 /* sizetype is sign extended, not zero extended. */
4887 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4891 /* Loop until there are no more initializers. */
4893 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4898 check_array_designated_initializer (d->cur);
4899 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4900 if (elt_init == error_mark_node)
4901 return error_mark_node;
4902 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4908 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4909 Parameters are the same of reshape_init_r. */
4912 reshape_init_array (tree type, reshape_iter *d)
4914 tree max_index = NULL_TREE;
4916 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4918 if (TYPE_DOMAIN (type))
4919 max_index = array_type_nelts (type);
4921 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4924 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4925 Parameters are the same of reshape_init_r. */
4928 reshape_init_vector (tree type, reshape_iter *d)
4930 tree max_index = NULL_TREE;
4932 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4934 if (COMPOUND_LITERAL_P (d->cur->value))
4936 tree value = d->cur->value;
4937 if (!same_type_p (TREE_TYPE (value), type))
4939 error ("invalid type %qT as initializer for a vector of type %qT",
4940 TREE_TYPE (d->cur->value), type);
4941 value = error_mark_node;
4947 /* For a vector, we initialize it as an array of the appropriate size. */
4948 if (TREE_CODE (type) == VECTOR_TYPE)
4949 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4951 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4954 /* Subroutine of reshape_init_r, processes the initializers for classes
4955 or union. Parameters are the same of reshape_init_r. */
4958 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4963 gcc_assert (CLASS_TYPE_P (type));
4965 /* The initializer for a class is always a CONSTRUCTOR. */
4966 new_init = build_constructor (init_list_type_node, NULL);
4967 field = next_initializable_field (TYPE_FIELDS (type));
4973 An initializer for an aggregate member that is an
4974 empty class shall have the form of an empty
4975 initializer-list {}. */
4976 if (!first_initializer_p)
4978 error ("initializer for %qT must be brace-enclosed", type);
4979 return error_mark_node;
4984 /* Loop through the initializable fields, gathering initializers. */
4985 while (d->cur != d->end)
4989 /* Handle designated initializers, as an extension. */
4992 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4994 if (!field || TREE_CODE (field) != FIELD_DECL)
4996 error ("%qT has no non-static data member named %qD", type,
4998 return error_mark_node;
5002 /* If we processed all the member of the class, we are done. */
5006 field_init = reshape_init_r (TREE_TYPE (field), d,
5007 /*first_initializer_p=*/false);
5008 if (field_init == error_mark_node)
5009 return error_mark_node;
5011 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5015 When a union is initialized with a brace-enclosed
5016 initializer, the braces shall only contain an
5017 initializer for the first member of the union. */
5018 if (TREE_CODE (type) == UNION_TYPE)
5021 field = next_initializable_field (DECL_CHAIN (field));
5027 /* Subroutine of reshape_init, which processes a single initializer (part of
5028 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5029 iterator within the CONSTRUCTOR which points to the initializer to process.
5030 FIRST_INITIALIZER_P is true if this is the first initializer of the
5031 outermost CONSTRUCTOR node. */
5034 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
5036 tree init = d->cur->value;
5038 if (error_operand_p (init))
5039 return error_mark_node;
5041 /* A non-aggregate type is always initialized with a single
5043 if (!CP_AGGREGATE_TYPE_P (type))
5045 /* It is invalid to initialize a non-aggregate type with a
5046 brace-enclosed initializer before C++0x.
5047 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5048 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5049 a CONSTRUCTOR (with a record type). */
5050 if (TREE_CODE (init) == CONSTRUCTOR
5051 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5053 if (SCALAR_TYPE_P (type))
5055 error ("braces around scalar initializer for type %qT", type);
5056 init = error_mark_node;
5059 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5068 All implicit type conversions (clause _conv_) are considered when
5069 initializing the aggregate member with an initializer from an
5070 initializer-list. If the initializer can initialize a member,
5071 the member is initialized. Otherwise, if the member is itself a
5072 non-empty subaggregate, brace elision is assumed and the
5073 initializer is considered for the initialization of the first
5074 member of the subaggregate. */
5075 if (TREE_CODE (init) != CONSTRUCTOR
5076 /* But don't try this for the first initializer, since that would be
5077 looking through the outermost braces; A a2 = { a1 }; is not a
5078 valid aggregate initialization. */
5079 && !first_initializer_p
5080 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5081 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5087 /* [dcl.init.string]
5089 A char array (whether plain char, signed char, or unsigned char)
5090 can be initialized by a string-literal (optionally enclosed in
5091 braces); a wchar_t array can be initialized by a wide
5092 string-literal (optionally enclosed in braces). */
5093 if (TREE_CODE (type) == ARRAY_TYPE
5094 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5096 tree str_init = init;
5098 /* Strip one level of braces if and only if they enclose a single
5099 element (as allowed by [dcl.init.string]). */
5100 if (!first_initializer_p
5101 && TREE_CODE (str_init) == CONSTRUCTOR
5102 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5104 str_init = VEC_index (constructor_elt,
5105 CONSTRUCTOR_ELTS (str_init), 0)->value;
5108 /* If it's a string literal, then it's the initializer for the array
5109 as a whole. Otherwise, continue with normal initialization for
5110 array types (one value per array element). */
5111 if (TREE_CODE (str_init) == STRING_CST)
5118 /* The following cases are about aggregates. If we are not within a full
5119 initializer already, and there is not a CONSTRUCTOR, it means that there
5120 is a missing set of braces (that is, we are processing the case for
5121 which reshape_init exists). */
5122 if (!first_initializer_p)
5124 if (TREE_CODE (init) == CONSTRUCTOR)
5126 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5127 /* There is no need to reshape pointer-to-member function
5128 initializers, as they are always constructed correctly
5129 by the front end. */
5131 else if (COMPOUND_LITERAL_P (init))
5132 /* For a nested compound literal, there is no need to reshape since
5133 brace elision is not allowed. Even if we decided to allow it,
5134 we should add a call to reshape_init in finish_compound_literal,
5135 before calling digest_init, so changing this code would still
5136 not be necessary. */
5137 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5141 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5142 return reshape_init (type, init);
5146 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5150 /* Dispatch to specialized routines. */
5151 if (CLASS_TYPE_P (type))
5152 return reshape_init_class (type, d, first_initializer_p);
5153 else if (TREE_CODE (type) == ARRAY_TYPE)
5154 return reshape_init_array (type, d);
5155 else if (TREE_CODE (type) == VECTOR_TYPE)
5156 return reshape_init_vector (type, d);
5161 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5162 brace-enclosed aggregate initializer.
5164 INIT is the CONSTRUCTOR containing the list of initializers describing
5165 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5166 It may not presently match the shape of the TYPE; for example:
5168 struct S { int a; int b; };
5169 struct S a[] = { 1, 2, 3, 4 };
5171 Here INIT will hold a VEC of four elements, rather than a
5172 VEC of two elements, each itself a VEC of two elements. This
5173 routine transforms INIT from the former form into the latter. The
5174 revised CONSTRUCTOR node is returned. */
5177 reshape_init (tree type, tree init)
5179 VEC(constructor_elt, gc) *v;
5183 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5185 v = CONSTRUCTOR_ELTS (init);
5187 /* An empty constructor does not need reshaping, and it is always a valid
5189 if (VEC_empty (constructor_elt, v))
5192 /* Recurse on this CONSTRUCTOR. */
5193 d.cur = VEC_index (constructor_elt, v, 0);
5194 d.end = d.cur + VEC_length (constructor_elt, v);
5196 new_init = reshape_init_r (type, &d, true);
5197 if (new_init == error_mark_node)
5198 return error_mark_node;
5200 /* Make sure all the element of the constructor were used. Otherwise,
5201 issue an error about exceeding initializers. */
5203 error ("too many initializers for %qT", type);
5208 /* Verify array initializer. Returns true if errors have been reported. */
5211 check_array_initializer (tree decl, tree type, tree init)
5213 tree element_type = TREE_TYPE (type);
5215 /* The array type itself need not be complete, because the
5216 initializer may tell us how many elements are in the array.
5217 But, the elements of the array must be complete. */
5218 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5221 error ("elements of array %q#D have incomplete type", decl);
5223 error ("elements of array %q#T have incomplete type", type);
5226 /* It is not valid to initialize a VLA. */
5228 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5229 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5232 error ("variable-sized object %qD may not be initialized", decl);
5234 error ("variable-sized compound literal");
5240 /* Subroutine of check_initializer; args are passed down from that function.
5241 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5244 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5247 int saved_stmts_are_full_exprs_p = 0;
5248 if (building_stmt_tree ())
5250 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5251 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5253 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5254 if (building_stmt_tree ())
5255 current_stmt_tree ()->stmts_are_full_exprs_p =
5256 saved_stmts_are_full_exprs_p;
5260 /* Verify INIT (the initializer for DECL), and record the
5261 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5262 grok_reference_init.
5264 If the return value is non-NULL, it is an expression that must be
5265 evaluated dynamically to initialize DECL. */
5268 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5270 tree type = TREE_TYPE (decl);
5271 tree init_code = NULL;
5272 tree extra_init = NULL_TREE;
5275 /* Things that are going to be initialized need to have complete
5277 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5279 if (type == error_mark_node)
5280 /* We will have already complained. */
5283 if (TREE_CODE (type) == ARRAY_TYPE)
5285 if (check_array_initializer (decl, type, init))
5288 else if (!COMPLETE_TYPE_P (type))
5290 error ("%qD has incomplete type", decl);
5291 TREE_TYPE (decl) = error_mark_node;
5295 /* There is no way to make a variable-sized class type in GNU C++. */
5296 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5298 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5300 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5301 if (SCALAR_TYPE_P (type))
5305 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5306 init = build_zero_init (type, NULL_TREE, false);
5308 else if (init_len != 1)
5310 error ("scalar object %qD requires one element in initializer",
5312 TREE_TYPE (decl) = error_mark_node;
5318 if (TREE_CODE (decl) == CONST_DECL)
5320 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5322 DECL_INITIAL (decl) = init;
5324 gcc_assert (init != NULL_TREE);
5327 else if (!init && DECL_REALLY_EXTERN (decl))
5329 else if (TREE_CODE (type) == REFERENCE_TYPE)
5330 init = grok_reference_init (decl, type, init, cleanup);
5331 else if (init || TYPE_NEEDS_CONSTRUCTING (type))
5334 check_for_uninitialized_const_var (decl);
5335 /* Do not reshape constructors of vectors (they don't need to be
5337 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5339 if (is_std_init_list (type))
5340 init = build_init_list_var_init (decl, type, init,
5341 &extra_init, cleanup);
5342 else if (TYPE_NON_AGGREGATE_CLASS (type))
5344 /* Don't reshape if the class has constructors. */
5345 if (cxx_dialect == cxx98)
5346 error ("in C++98 %qD must be initialized by constructor, "
5350 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5352 error ("opaque vector types cannot be initialized");
5353 init = error_mark_node;
5356 init = reshape_init (type, init);
5359 /* If DECL has an array type without a specific bound, deduce the
5360 array size from the initializer. */
5361 maybe_deduce_size_from_array_init (decl, init);
5362 type = TREE_TYPE (decl);
5363 if (type == error_mark_node)
5366 if (TYPE_NEEDS_CONSTRUCTING (type)
5367 || (CLASS_TYPE_P (type)
5368 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5370 init_code = build_aggr_init_full_exprs (decl, init, flags);
5372 /* If this is a constexpr initializer, expand_default_init will
5373 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5374 case, pull the initializer back out and pass it down into
5375 store_init_value. */
5376 while (TREE_CODE (init_code) == EXPR_STMT
5377 || TREE_CODE (init_code) == CONVERT_EXPR)
5378 init_code = TREE_OPERAND (init_code, 0);
5379 if (TREE_CODE (init_code) == INIT_EXPR)
5381 init = TREE_OPERAND (init_code, 1);
5382 init_code = NULL_TREE;
5383 /* Don't call digest_init; it's unnecessary and will complain
5384 about aggregate initialization of non-aggregate classes. */
5385 flags |= LOOKUP_ALREADY_DIGESTED;
5387 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5389 /* Declared constexpr, but no suitable initializer; massage
5390 init appropriately so we can pass it into store_init_value
5392 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5393 init = finish_compound_literal (type, init);
5394 else if (CLASS_TYPE_P (type)
5395 && (!init || TREE_CODE (init) == TREE_LIST))
5397 init = build_functional_cast (type, init, tf_none);
5398 if (init != error_mark_node)
5399 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5401 init_code = NULL_TREE;
5407 if (init && TREE_CODE (init) != TREE_VEC)
5409 init_code = store_init_value (decl, init, flags);
5410 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5411 && DECL_INITIAL (decl)
5412 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5413 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5414 warning (0, "array %qD initialized by parenthesized string literal %qE",
5415 decl, DECL_INITIAL (decl));
5421 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5422 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5423 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5424 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5427 check_for_uninitialized_const_var (decl);
5430 if (init && init != error_mark_node)
5431 init_code = build2 (INIT_EXPR, type, decl, init);
5434 init_code = add_stmt_to_compound (extra_init, init_code);
5436 if (init_code && DECL_IN_AGGR_P (decl))
5438 static int explained = 0;
5440 if (cxx_dialect < cxx0x)
5441 error ("initializer invalid for static member with constructor");
5443 error ("non-constant in-class initialization invalid for static "
5444 "member %qD", decl);
5447 error ("(an out of class initialization is required)");
5455 /* If DECL is not a local variable, give it RTL. */
5458 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5460 int toplev = toplevel_bindings_p ();
5462 const char *filename;
5464 /* Set the DECL_ASSEMBLER_NAME for the object. */
5467 /* The `register' keyword, when used together with an
5468 asm-specification, indicates that the variable should be
5469 placed in a particular register. */
5470 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5472 set_user_assembler_name (decl, asmspec);
5473 DECL_HARD_REGISTER (decl) = 1;
5477 if (TREE_CODE (decl) == FUNCTION_DECL
5478 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5479 set_builtin_user_assembler_name (decl, asmspec);
5480 set_user_assembler_name (decl, asmspec);
5484 /* Handle non-variables up front. */
5485 if (TREE_CODE (decl) != VAR_DECL)
5487 rest_of_decl_compilation (decl, toplev, at_eof);
5491 /* If we see a class member here, it should be a static data
5493 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5495 gcc_assert (TREE_STATIC (decl));
5496 /* An in-class declaration of a static data member should be
5497 external; it is only a declaration, and not a definition. */
5498 if (init == NULL_TREE)
5499 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5502 /* We don't create any RTL for local variables. */
5503 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5506 /* We defer emission of local statics until the corresponding
5507 DECL_EXPR is expanded. */
5508 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5510 /* We try to defer namespace-scope static constants so that they are
5511 not emitted into the object file unnecessarily. */
5512 filename = input_filename;
5513 if (!DECL_VIRTUAL_P (decl)
5514 && TREE_READONLY (decl)
5515 && DECL_INITIAL (decl) != NULL_TREE
5516 && DECL_INITIAL (decl) != error_mark_node
5518 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5520 && !TREE_PUBLIC (decl))
5522 /* Fool with the linkage of static consts according to #pragma
5524 struct c_fileinfo *finfo = get_fileinfo (filename);
5525 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5527 TREE_PUBLIC (decl) = 1;
5528 DECL_EXTERNAL (decl) = finfo->interface_only;
5533 /* Likewise for template instantiations. */
5534 else if (DECL_LANG_SPECIFIC (decl)
5535 && DECL_IMPLICIT_INSTANTIATION (decl))
5538 /* If we're not deferring, go ahead and assemble the variable. */
5540 rest_of_decl_compilation (decl, toplev, at_eof);
5543 /* walk_tree helper for wrap_temporary_cleanups, below. */
5546 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5548 if (TYPE_P (*stmt_p))
5554 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5556 tree guard = (tree)data;
5557 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5559 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5560 /* Tell honor_protect_cleanup_actions to handle this as a separate
5562 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5564 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5570 /* We're initializing a local variable which has a cleanup GUARD. If there
5571 are any temporaries used in the initializer INIT of this variable, we
5572 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5573 variable will be cleaned up properly if one of them throws.
5575 Unfortunately, there's no way to express this properly in terms of
5576 nesting, as the regions for the temporaries overlap the region for the
5577 variable itself; if there are two temporaries, the variable needs to be
5578 the first thing destroyed if either of them throws. However, we only
5579 want to run the variable's cleanup if it actually got constructed. So
5580 we need to guard the temporary cleanups with the variable's cleanup if
5581 they are run on the normal path, but not if they are run on the
5582 exceptional path. We implement this by telling
5583 honor_protect_cleanup_actions to strip the variable cleanup from the
5584 exceptional path. */
5587 wrap_temporary_cleanups (tree init, tree guard)
5589 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5592 /* Generate code to initialize DECL (a local variable). */
5595 initialize_local_var (tree decl, tree init)
5597 tree type = TREE_TYPE (decl);
5601 gcc_assert (TREE_CODE (decl) == VAR_DECL
5602 || TREE_CODE (decl) == RESULT_DECL);
5603 gcc_assert (!TREE_STATIC (decl));
5605 if (DECL_SIZE (decl) == NULL_TREE)
5607 /* If we used it already as memory, it must stay in memory. */
5608 DECL_INITIAL (decl) = NULL_TREE;
5609 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5613 if (type == error_mark_node)
5616 /* Compute and store the initial value. */
5617 already_used = TREE_USED (decl) || TREE_USED (type);
5618 if (TREE_USED (type))
5619 DECL_READ_P (decl) = 1;
5621 /* Generate a cleanup, if necessary. */
5622 cleanup = cxx_maybe_build_cleanup (decl);
5624 /* Perform the initialization. */
5627 int saved_stmts_are_full_exprs_p;
5629 /* If we're only initializing a single object, guard the destructors
5630 of any temporaries used in its initializer with its destructor.
5631 This isn't right for arrays because each element initialization is
5632 a full-expression. */
5633 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5634 wrap_temporary_cleanups (init, cleanup);
5636 gcc_assert (building_stmt_tree ());
5637 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5638 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5639 finish_expr_stmt (init);
5640 current_stmt_tree ()->stmts_are_full_exprs_p =
5641 saved_stmts_are_full_exprs_p;
5644 /* Set this to 0 so we can tell whether an aggregate which was
5645 initialized was ever used. Don't do this if it has a
5646 destructor, so we don't complain about the 'resource
5647 allocation is initialization' idiom. Now set
5648 attribute((unused)) on types so decls of that type will be
5649 marked used. (see TREE_USED, above.) */
5650 if (TYPE_NEEDS_CONSTRUCTING (type)
5652 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5653 && DECL_NAME (decl))
5654 TREE_USED (decl) = 0;
5655 else if (already_used)
5656 TREE_USED (decl) = 1;
5659 finish_decl_cleanup (decl, cleanup);
5662 /* DECL is a VAR_DECL for a compiler-generated variable with static
5663 storage duration (like a virtual table) whose initializer is a
5664 compile-time constant. Initialize the variable and provide it to the
5668 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5671 gcc_assert (DECL_ARTIFICIAL (decl));
5672 init = build_constructor (TREE_TYPE (decl), v);
5673 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5674 DECL_INITIAL (decl) = init;
5675 DECL_INITIALIZED_P (decl) = 1;
5676 determine_visibility (decl);
5677 layout_var_decl (decl);
5678 maybe_commonize_var (decl);
5679 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5682 /* INIT is the initializer for a variable, as represented by the
5683 parser. Returns true iff INIT is value-dependent. */
5686 value_dependent_init_p (tree init)
5688 if (TREE_CODE (init) == TREE_LIST)
5689 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5690 return any_value_dependent_elements_p (init);
5691 else if (TREE_CODE (init) == CONSTRUCTOR)
5692 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5694 VEC(constructor_elt, gc) *elts;
5698 elts = CONSTRUCTOR_ELTS (init);
5699 nelts = VEC_length (constructor_elt, elts);
5700 for (i = 0; i < nelts; ++i)
5701 if (value_dependent_init_p (VEC_index (constructor_elt,
5706 /* It must be a simple expression, e.g., int i = 3; */
5707 return value_dependent_expression_p (init);
5712 /* Finish processing of a declaration;
5713 install its line number and initial value.
5714 If the length of an array type is not known before,
5715 it must be determined now, from the initial value, or it is an error.
5717 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5718 true, then INIT is an integral constant expression.
5720 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5721 if the (init) syntax was used. */
5724 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5725 tree asmspec_tree, int flags)
5729 const char *asmspec = NULL;
5730 int was_readonly = 0;
5731 bool var_definition_p = false;
5732 int saved_processing_template_decl;
5735 if (decl == error_mark_node)
5740 error ("assignment (not initialization) in declaration");
5744 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5745 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5746 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5748 type = TREE_TYPE (decl);
5749 if (type == error_mark_node)
5752 /* Assume no cleanup is required. */
5753 cleanup = NULL_TREE;
5754 saved_processing_template_decl = processing_template_decl;
5756 /* If a name was specified, get the string. */
5757 if (global_scope_p (current_binding_level))
5758 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5759 if (asmspec_tree && asmspec_tree != error_mark_node)
5760 asmspec = TREE_STRING_POINTER (asmspec_tree);
5762 if (current_class_type
5763 && CP_DECL_CONTEXT (decl) == current_class_type
5764 && TYPE_BEING_DEFINED (current_class_type)
5765 && (DECL_INITIAL (decl) || init))
5766 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5768 auto_node = type_uses_auto (type);
5772 if (init == NULL_TREE)
5774 error ("declaration of %q#D has no initializer", decl);
5775 TREE_TYPE (decl) = error_mark_node;
5779 if (TREE_CODE (d_init) == TREE_LIST)
5780 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5781 tf_warning_or_error);
5782 d_init = resolve_nondeduced_context (d_init);
5783 if (describable_type (d_init))
5785 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5787 if (type == error_mark_node)
5792 if (TREE_CODE (decl) == FUNCTION_DECL)
5793 validate_constexpr_fundecl (decl);
5795 else if (!ensure_literal_type_for_constexpr_object (decl))
5796 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5798 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5801 if (init == ridpointers[(int)RID_DELETE])
5803 /* FIXME check this is 1st decl. */
5804 DECL_DELETED_FN (decl) = 1;
5805 DECL_DECLARED_INLINE_P (decl) = 1;
5806 DECL_INITIAL (decl) = error_mark_node;
5807 FOR_EACH_CLONE (clone, decl)
5809 DECL_DELETED_FN (clone) = 1;
5810 DECL_DECLARED_INLINE_P (clone) = 1;
5811 DECL_INITIAL (clone) = error_mark_node;
5815 else if (init == ridpointers[(int)RID_DEFAULT])
5817 if (defaultable_fn_check (decl))
5818 DECL_DEFAULTED_FN (decl) = 1;
5820 DECL_INITIAL (decl) = NULL_TREE;
5824 if (init && TREE_CODE (decl) == VAR_DECL)
5826 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5827 /* FIXME we rely on TREE_CONSTANT below; basing that on
5828 init_const_expr_p is probably wrong for C++0x. */
5829 if (init_const_expr_p)
5831 /* Set these flags now for C++98 templates. We'll update the
5832 flags in store_init_value for instantiations and C++0x. */
5833 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5834 if (decl_maybe_constant_var_p (decl))
5835 TREE_CONSTANT (decl) = 1;
5839 if (processing_template_decl)
5841 bool type_dependent_p;
5843 /* Add this declaration to the statement-tree. */
5844 if (at_function_scope_p ())
5845 add_decl_expr (decl);
5847 type_dependent_p = dependent_type_p (type);
5849 if (check_for_bare_parameter_packs (init))
5852 DECL_INITIAL (decl) = NULL_TREE;
5855 /* Generally, initializers in templates are expanded when the
5856 template is instantiated. But, if DECL is a variable constant
5857 then it can be used in future constant expressions, so its value
5858 must be available. */
5860 && DECL_CLASS_SCOPE_P (decl)
5861 /* We just set TREE_CONSTANT appropriately; see above. */
5862 && TREE_CONSTANT (decl)
5863 && !type_dependent_p
5864 /* FIXME non-value-dependent constant expression */
5865 && !value_dependent_init_p (init)))
5868 DECL_INITIAL (decl) = init;
5869 if (TREE_CODE (decl) == VAR_DECL
5870 && !DECL_PRETTY_FUNCTION_P (decl)
5871 && !type_dependent_p)
5872 maybe_deduce_size_from_array_init (decl, init);
5876 if (TREE_CODE (init) == TREE_LIST)
5878 /* If the parenthesized-initializer form was used (e.g.,
5879 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5880 arguments. (There is generally only one.) We convert them
5883 for (; list; list = TREE_CHAIN (list))
5885 tree elt = TREE_VALUE (list);
5886 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5890 init = fold_non_dependent_expr (init);
5891 processing_template_decl = 0;
5894 /* Take care of TYPE_DECLs up front. */
5895 if (TREE_CODE (decl) == TYPE_DECL)
5897 if (type != error_mark_node
5898 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5900 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5901 warning (0, "shadowing previous type declaration of %q#D", decl);
5902 set_identifier_type_value (DECL_NAME (decl), decl);
5905 /* If we have installed this as the canonical typedef for this
5906 type, and that type has not been defined yet, delay emitting
5907 the debug information for it, as we will emit it later. */
5908 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5909 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5910 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5912 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5917 /* A reference will be modified here, as it is initialized. */
5918 if (! DECL_EXTERNAL (decl)
5919 && TREE_READONLY (decl)
5920 && TREE_CODE (type) == REFERENCE_TYPE)
5923 TREE_READONLY (decl) = 0;
5926 if (TREE_CODE (decl) == VAR_DECL)
5928 /* Only variables with trivial initialization and destruction can
5929 have thread-local storage. */
5930 if (DECL_THREAD_LOCAL_P (decl)
5931 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5932 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5933 error ("%qD cannot be thread-local because it has non-trivial "
5934 "type %qT", decl, TREE_TYPE (decl));
5935 /* If this is a local variable that will need a mangled name,
5936 register it now. We must do this before processing the
5937 initializer for the variable, since the initialization might
5938 require a guard variable, and since the mangled name of the
5939 guard variable will depend on the mangled name of this
5941 if (DECL_FUNCTION_SCOPE_P (decl)
5942 && TREE_STATIC (decl)
5943 && !DECL_ARTIFICIAL (decl))
5945 push_local_name (decl);
5946 if (DECL_CONSTRUCTOR_P (current_function_decl)
5947 || DECL_DESTRUCTOR_P (current_function_decl))
5948 /* Normally local_decls is populated during GIMPLE lowering,
5949 but [cd]tors are never actually compiled directly. We need
5950 to put statics on the list so we can deal with the label
5951 address extension. */
5952 add_local_decl (cfun, decl);
5955 /* Convert the initializer to the type of DECL, if we have not
5956 already initialized DECL. */
5957 if (!DECL_INITIALIZED_P (decl)
5958 /* If !DECL_EXTERNAL then DECL is being defined. In the
5959 case of a static data member initialized inside the
5960 class-specifier, there can be an initializer even if DECL
5961 is *not* defined. */
5962 && (!DECL_EXTERNAL (decl) || init))
5964 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5967 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5968 /* Allow libjava/prims.cc define primitive classes. */
5969 if (init != NULL_TREE
5970 || jclass == NULL_TREE
5971 || TREE_CODE (jclass) != TYPE_DECL
5972 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5973 || !same_type_ignoring_top_level_qualifiers_p
5974 (type, TREE_TYPE (TREE_TYPE (jclass))))
5975 error ("Java object %qD not allocated with %<new%>", decl);
5978 init = check_initializer (decl, init, flags, &cleanup);
5979 /* Thread-local storage cannot be dynamically initialized. */
5980 if (DECL_THREAD_LOCAL_P (decl) && init)
5982 error ("%qD is thread-local and so cannot be dynamically "
5983 "initialized", decl);
5987 /* Check that the initializer for a static data member was a
5988 constant. Although we check in the parser that the
5989 initializer is an integral constant expression, we do not
5990 simplify division-by-zero at the point at which it
5991 occurs. Therefore, in:
5993 struct S { static const int i = 7 / 0; };
5995 we issue an error at this point. It would
5996 probably be better to forbid division by zero in
5997 integral constant expressions. */
5998 if (DECL_EXTERNAL (decl) && init)
6000 error ("%qD cannot be initialized by a non-constant expression"
6001 " when being declared", decl);
6002 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6010 The memory occupied by any object of static storage
6011 duration is zero-initialized at program startup before
6012 any other initialization takes place.
6014 We cannot create an appropriate initializer until after
6015 the type of DECL is finalized. If DECL_INITIAL is set,
6016 then the DECL is statically initialized, and any
6017 necessary zero-initialization has already been performed. */
6018 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6019 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6020 /*nelts=*/NULL_TREE,
6021 /*static_storage_p=*/true);
6022 /* Remember that the initialization for this variable has
6024 DECL_INITIALIZED_P (decl) = 1;
6025 /* This declaration is the definition of this variable,
6026 unless we are initializing a static data member within
6027 the class specifier. */
6028 if (!DECL_EXTERNAL (decl))
6029 var_definition_p = true;
6031 /* If the variable has an array type, lay out the type, even if
6032 there is no initializer. It is valid to index through the
6033 array, and we must get TYPE_ALIGN set correctly on the array
6035 else if (TREE_CODE (type) == ARRAY_TYPE)
6038 if (!processing_template_decl
6039 && TREE_STATIC (decl)
6040 && !at_function_scope_p ()
6041 && current_function_decl == NULL)
6042 /* So decl is a global variable or a static member of a
6043 non local class. Record the types it uses
6044 so that we can decide later to emit debug info for them. */
6045 record_types_used_by_current_var_decl (decl);
6047 else if (TREE_CODE (decl) == FIELD_DECL
6048 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6049 error ("non-static data member %qD has Java class type", decl);
6051 /* Add this declaration to the statement-tree. This needs to happen
6052 after the call to check_initializer so that the DECL_EXPR for a
6053 reference temp is added before the DECL_EXPR for the reference itself. */
6054 if (at_function_scope_p ())
6055 add_decl_expr (decl);
6057 /* Let the middle end know about variables and functions -- but not
6058 static data members in uninstantiated class templates. */
6059 if (!saved_processing_template_decl
6060 && (TREE_CODE (decl) == VAR_DECL
6061 || TREE_CODE (decl) == FUNCTION_DECL))
6063 if (TREE_CODE (decl) == VAR_DECL)
6065 layout_var_decl (decl);
6066 maybe_commonize_var (decl);
6069 /* This needs to happen after the linkage is set. */
6070 determine_visibility (decl);
6072 if (var_definition_p && TREE_STATIC (decl))
6074 /* If a TREE_READONLY variable needs initialization
6075 at runtime, it is no longer readonly and we need to
6076 avoid MEM_READONLY_P being set on RTL created for it. */
6079 if (TREE_READONLY (decl))
6080 TREE_READONLY (decl) = 0;
6083 else if (was_readonly)
6084 TREE_READONLY (decl) = 1;
6087 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6089 /* Check for abstractness of the type. Notice that there is no
6090 need to strip array types here since the check for those types
6091 is already done within create_array_type_for_decl. */
6092 if (TREE_CODE (type) == FUNCTION_TYPE
6093 || TREE_CODE (type) == METHOD_TYPE)
6094 abstract_virtuals_error (decl, TREE_TYPE (type));
6096 abstract_virtuals_error (decl, type);
6098 if (TREE_TYPE (decl) == error_mark_node)
6099 /* No initialization required. */
6101 else if (TREE_CODE (decl) == FUNCTION_DECL)
6105 if (init == ridpointers[(int)RID_DEFAULT])
6107 /* An out-of-class default definition is defined at
6108 the point where it is explicitly defaulted. */
6109 if (DECL_DELETED_FN (decl))
6110 maybe_explain_implicit_delete (decl);
6111 else if (DECL_INITIAL (decl) == error_mark_node)
6112 synthesize_method (decl);
6115 error ("function %q#D is initialized like a variable", decl);
6117 /* else no initialization required. */
6119 else if (DECL_EXTERNAL (decl)
6120 && ! (DECL_LANG_SPECIFIC (decl)
6121 && DECL_NOT_REALLY_EXTERN (decl)))
6124 DECL_INITIAL (decl) = init;
6126 /* A variable definition. */
6127 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6128 /* Initialize the local variable. */
6129 initialize_local_var (decl, init);
6131 /* If a variable is defined, and then a subsequent
6132 definition with external linkage is encountered, we will
6133 get here twice for the same variable. We want to avoid
6134 calling expand_static_init more than once. For variables
6135 that are not static data members, we can call
6136 expand_static_init only when we actually process the
6137 initializer. It is not legal to redeclare a static data
6138 member, so this issue does not arise in that case. */
6139 else if (var_definition_p && TREE_STATIC (decl))
6140 expand_static_init (decl, init);
6143 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6144 reference, insert it in the statement-tree now. */
6146 push_cleanup (decl, cleanup, false);
6149 processing_template_decl = saved_processing_template_decl;
6152 TREE_READONLY (decl) = 1;
6155 /* Returns a declaration for a VAR_DECL as if:
6157 extern "C" TYPE NAME;
6159 had been seen. Used to create compiler-generated global
6163 declare_global_var (tree name, tree type)
6167 push_to_top_level ();
6168 decl = build_decl (input_location, VAR_DECL, name, type);
6169 TREE_PUBLIC (decl) = 1;
6170 DECL_EXTERNAL (decl) = 1;
6171 DECL_ARTIFICIAL (decl) = 1;
6172 /* If the user has explicitly declared this variable (perhaps
6173 because the code we are compiling is part of a low-level runtime
6174 library), then it is possible that our declaration will be merged
6175 with theirs by pushdecl. */
6176 decl = pushdecl (decl);
6177 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6178 pop_from_top_level ();
6183 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6184 if "__cxa_atexit" is not being used) corresponding to the function
6185 to be called when the program exits. */
6188 get_atexit_fn_ptr_type (void)
6192 if (!atexit_fn_ptr_type_node)
6195 if (flag_use_cxa_atexit
6196 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6197 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6198 arg_type = ptr_type_node;
6200 /* The parameter to "atexit" is "void (*)(void)". */
6201 arg_type = NULL_TREE;
6203 fn_type = build_function_type_list (void_type_node,
6204 arg_type, NULL_TREE);
6205 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6208 return atexit_fn_ptr_type_node;
6211 /* Returns a pointer to the `atexit' function. Note that if
6212 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6213 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6216 get_atexit_node (void)
6222 bool use_aeabi_atexit;
6227 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6229 /* The declaration for `__cxa_atexit' is:
6231 int __cxa_atexit (void (*)(void *), void *, void *)
6233 We build up the argument types and then the function type
6235 tree argtype0, argtype1, argtype2;
6237 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6238 /* First, build the pointer-to-function type for the first
6240 fn_ptr_type = get_atexit_fn_ptr_type ();
6241 /* Then, build the rest of the argument types. */
6242 argtype2 = ptr_type_node;
6243 if (use_aeabi_atexit)
6245 argtype1 = fn_ptr_type;
6246 argtype0 = ptr_type_node;
6250 argtype1 = ptr_type_node;
6251 argtype0 = fn_ptr_type;
6253 /* And the final __cxa_atexit type. */
6254 fn_type = build_function_type_list (integer_type_node,
6255 argtype0, argtype1, argtype2,
6257 fn_ptr_type = build_pointer_type (fn_type);
6258 if (use_aeabi_atexit)
6259 name = "__aeabi_atexit";
6261 name = "__cxa_atexit";
6265 /* The declaration for `atexit' is:
6267 int atexit (void (*)());
6269 We build up the argument types and then the function type
6271 fn_ptr_type = get_atexit_fn_ptr_type ();
6272 /* Build the final atexit type. */
6273 fn_type = build_function_type_list (integer_type_node,
6274 fn_ptr_type, NULL_TREE);
6278 /* Now, build the function declaration. */
6279 push_lang_context (lang_name_c);
6280 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6281 mark_used (atexit_fndecl);
6282 pop_lang_context ();
6283 atexit_node = decay_conversion (atexit_fndecl);
6288 /* Returns the __dso_handle VAR_DECL. */
6291 get_dso_handle_node (void)
6293 if (dso_handle_node)
6294 return dso_handle_node;
6296 /* Declare the variable. */
6297 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6300 return dso_handle_node;
6303 /* Begin a new function with internal linkage whose job will be simply
6304 to destroy some particular variable. */
6306 static GTY(()) int start_cleanup_cnt;
6309 start_cleanup_fn (void)
6314 bool use_cxa_atexit = flag_use_cxa_atexit
6315 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6317 push_to_top_level ();
6319 /* No need to mangle this. */
6320 push_lang_context (lang_name_c);
6322 /* Build the name of the function. */
6323 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6324 /* Build the function declaration. */
6325 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6326 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6327 /* It's a function with internal linkage, generated by the
6329 TREE_PUBLIC (fndecl) = 0;
6330 DECL_ARTIFICIAL (fndecl) = 1;
6331 /* Make the function `inline' so that it is only emitted if it is
6332 actually needed. It is unlikely that it will be inlined, since
6333 it is only called via a function pointer, but we avoid unnecessary
6334 emissions this way. */
6335 DECL_DECLARED_INLINE_P (fndecl) = 1;
6336 DECL_INTERFACE_KNOWN (fndecl) = 1;
6337 /* Build the parameter. */
6342 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6343 DECL_CONTEXT (parmdecl) = fndecl;
6344 TREE_USED (parmdecl) = 1;
6345 DECL_READ_P (parmdecl) = 1;
6346 DECL_ARGUMENTS (fndecl) = parmdecl;
6350 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6352 pop_lang_context ();
6354 return current_function_decl;
6357 /* Finish the cleanup function begun by start_cleanup_fn. */
6360 end_cleanup_fn (void)
6362 expand_or_defer_fn (finish_function (0));
6364 pop_from_top_level ();
6367 /* Generate code to handle the destruction of DECL, an object with
6368 static storage duration. */
6371 register_dtor_fn (tree decl)
6378 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6380 type = TREE_TYPE (decl);
6381 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6382 return void_zero_node;
6384 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6385 a class object, we can just pass the destructor to
6386 "__cxa_atexit"; we don't have to build a temporary function to do
6388 use_dtor = (flag_use_cxa_atexit
6389 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6390 && CLASS_TYPE_P (type));
6395 /* Find the destructor. */
6396 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6397 gcc_assert (idx >= 0);
6398 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6399 /* Make sure it is accessible. */
6400 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6404 /* Call build_cleanup before we enter the anonymous function so
6405 that any access checks will be done relative to the current
6406 scope, rather than the scope of the anonymous function. */
6407 build_cleanup (decl);
6409 /* Now start the function. */
6410 cleanup = start_cleanup_fn ();
6412 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6413 to the original function, rather than the anonymous one. That
6414 will make the back end think that nested functions are in use,
6415 which causes confusion. */
6416 push_deferring_access_checks (dk_no_check);
6417 fcall = build_cleanup (decl);
6418 pop_deferring_access_checks ();
6420 /* Create the body of the anonymous function. */
6421 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6422 finish_expr_stmt (fcall);
6423 finish_compound_stmt (compound_stmt);
6427 /* Call atexit with the cleanup function. */
6428 mark_used (cleanup);
6429 cleanup = build_address (cleanup);
6430 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6436 /* We must convert CLEANUP to the type that "__cxa_atexit"
6438 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6439 /* "__cxa_atexit" will pass the address of DECL to the
6440 cleanup function. */
6442 addr = build_address (decl);
6443 /* The declared type of the parameter to "__cxa_atexit" is
6444 "void *". For plain "T*", we could just let the
6445 machinery in cp_build_function_call convert it -- but if the
6446 type is "cv-qualified T *", then we need to convert it
6447 before passing it in, to avoid spurious errors. */
6448 addr = build_nop (ptr_type_node, addr);
6451 /* Since the cleanup functions we build ignore the address
6452 they're given, there's no reason to pass the actual address
6453 in, and, in general, it's cheaper to pass NULL than any
6455 addr = null_pointer_node;
6456 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6457 tf_warning_or_error);
6458 if (targetm.cxx.use_aeabi_atexit ())
6471 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6472 arg0, arg1, arg2, NULL_TREE);
6475 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6476 is its initializer. Generate code to handle the construction
6477 and destruction of DECL. */
6480 expand_static_init (tree decl, tree init)
6482 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6483 gcc_assert (TREE_STATIC (decl));
6485 /* Some variables require no dynamic initialization. */
6487 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6490 if (DECL_FUNCTION_SCOPE_P (decl))
6492 /* Emit code to perform this initialization but once. */
6493 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6494 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6495 tree guard, guard_addr;
6496 tree acquire_fn, release_fn, abort_fn;
6499 /* Emit code to perform this initialization but once. This code
6502 static <type> guard;
6503 if (!guard.first_byte) {
6504 if (__cxa_guard_acquire (&guard)) {
6507 // Do initialization.
6508 flag = true; __cxa_guard_release (&guard);
6509 // Register variable for destruction at end of program.
6511 if (!flag) __cxa_guard_abort (&guard);
6515 Note that the `flag' variable is only set to 1 *after* the
6516 initialization is complete. This ensures that an exception,
6517 thrown during the construction, will cause the variable to
6518 reinitialized when we pass through this code again, as per:
6522 If the initialization exits by throwing an exception, the
6523 initialization is not complete, so it will be tried again
6524 the next time control enters the declaration.
6526 This process should be thread-safe, too; multiple threads
6527 should not be able to initialize the variable more than
6530 /* Create the guard variable. */
6531 guard = get_guard (decl);
6533 /* This optimization isn't safe on targets with relaxed memory
6534 consistency. On such targets we force synchronization in
6535 __cxa_guard_acquire. */
6536 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6538 /* Begin the conditional initialization. */
6539 if_stmt = begin_if_stmt ();
6540 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6541 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6544 if (flag_threadsafe_statics)
6546 guard_addr = build_address (guard);
6548 acquire_fn = get_identifier ("__cxa_guard_acquire");
6549 release_fn = get_identifier ("__cxa_guard_release");
6550 abort_fn = get_identifier ("__cxa_guard_abort");
6551 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6553 tree vfntype = build_function_type_list (void_type_node,
6554 TREE_TYPE (guard_addr),
6556 acquire_fn = push_library_fn
6557 (acquire_fn, build_function_type_list (integer_type_node,
6558 TREE_TYPE (guard_addr),
6561 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6562 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6566 release_fn = identifier_global_value (release_fn);
6567 abort_fn = identifier_global_value (abort_fn);
6570 inner_if_stmt = begin_if_stmt ();
6571 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6574 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6575 begin = get_target_expr (boolean_false_node);
6576 flag = TARGET_EXPR_SLOT (begin);
6578 TARGET_EXPR_CLEANUP (begin)
6579 = build3 (COND_EXPR, void_type_node, flag,
6581 build_call_n (abort_fn, 1, guard_addr));
6582 CLEANUP_EH_ONLY (begin) = 1;
6584 /* Do the initialization itself. */
6585 init = add_stmt_to_compound (begin, init);
6586 init = add_stmt_to_compound
6587 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6588 init = add_stmt_to_compound
6589 (init, build_call_n (release_fn, 1, guard_addr));
6592 init = add_stmt_to_compound (init, set_guard (guard));
6594 /* Use atexit to register a function for destroying this static
6596 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6598 finish_expr_stmt (init);
6600 if (flag_threadsafe_statics)
6602 finish_compound_stmt (inner_then_clause);
6603 finish_then_clause (inner_if_stmt);
6604 finish_if_stmt (inner_if_stmt);
6607 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6609 finish_compound_stmt (then_clause);
6610 finish_then_clause (if_stmt);
6611 finish_if_stmt (if_stmt);
6615 static_aggregates = tree_cons (init, decl, static_aggregates);
6619 /* Make TYPE a complete type based on INITIAL_VALUE.
6620 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6621 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6622 3 if the initializer list is empty (in pedantic mode). */
6625 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6628 tree type, elt_type;
6632 unsigned HOST_WIDE_INT i;
6635 /* An array of character type can be initialized from a
6636 brace-enclosed string constant.
6638 FIXME: this code is duplicated from reshape_init. Probably
6639 we should just call reshape_init here? */
6640 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6641 && TREE_CODE (initial_value) == CONSTRUCTOR
6642 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6644 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6645 tree value = VEC_index (constructor_elt, v, 0)->value;
6647 if (TREE_CODE (value) == STRING_CST
6648 && VEC_length (constructor_elt, v) == 1)
6649 initial_value = value;
6652 /* If any of the elements are parameter packs, we can't actually
6653 complete this type now because the array size is dependent. */
6654 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6656 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6659 if (PACK_EXPANSION_P (value))
6665 failure = complete_array_type (ptype, initial_value, do_default);
6667 /* We can create the array before the element type is complete, which
6668 means that we didn't have these two bits set in the original type
6669 either. In completing the type, we are expected to propagate these
6670 bits. See also complete_type which does the same thing for arrays
6673 if (TYPE_DOMAIN (type))
6675 elt_type = TREE_TYPE (type);
6676 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6677 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6678 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6684 /* Return zero if something is declared to be a member of type
6685 CTYPE when in the context of CUR_TYPE. STRING is the error
6686 message to print in that case. Otherwise, quietly return 1. */
6689 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6691 if (ctype && ctype != cur_type)
6693 if (flags == DTOR_FLAG)
6694 error ("destructor for alien class %qT cannot be a member", ctype);
6696 error ("constructor for alien class %qT cannot be a member", ctype);
6702 /* Subroutine of `grokdeclarator'. */
6704 /* Generate errors possibly applicable for a given set of specifiers.
6705 This is for ARM $7.1.2. */
6708 bad_specifiers (tree object,
6709 enum bad_spec_place type,
6720 error ("%qD declared as a %<virtual%> variable", object);
6722 error ("%qD declared as an %<inline%> variable", object);
6724 error ("%<const%> and %<volatile%> function specifiers on "
6725 "%qD invalid in variable declaration", object);
6729 error ("%qD declared as a %<virtual%> parameter", object);
6731 error ("%qD declared as an %<inline%> parameter", object);
6733 error ("%<const%> and %<volatile%> function specifiers on "
6734 "%qD invalid in parameter declaration", object);
6738 error ("%qD declared as a %<virtual%> type", object);
6740 error ("%qD declared as an %<inline%> type", object);
6742 error ("%<const%> and %<volatile%> function specifiers on "
6743 "%qD invalid in type declaration", object);
6747 error ("%qD declared as a %<virtual%> field", object);
6749 error ("%qD declared as an %<inline%> field", object);
6751 error ("%<const%> and %<volatile%> function specifiers on "
6752 "%qD invalid in field declaration", object);
6758 error ("%q+D declared as a friend", object);
6760 && (TREE_CODE (object) == TYPE_DECL
6761 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6762 && !TYPE_REFFN_P (TREE_TYPE (object))
6763 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6764 error ("%q+D declared with an exception specification", object);
6767 /* DECL is a member function or static data member and is presently
6768 being defined. Check that the definition is taking place in a
6772 check_class_member_definition_namespace (tree decl)
6774 /* These checks only apply to member functions and static data
6776 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6777 || TREE_CODE (decl) == VAR_DECL);
6778 /* We check for problems with specializations in pt.c in
6779 check_specialization_namespace, where we can issue better
6781 if (processing_specialization)
6783 /* There are no restrictions on the placement of
6784 explicit instantiations. */
6785 if (processing_explicit_instantiation)
6789 A member function definition that appears outside of the
6790 class definition shall appear in a namespace scope enclosing
6791 the class definition.
6795 The definition for a static data member shall appear in a
6796 namespace scope enclosing the member's class definition. */
6797 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6798 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6799 decl, DECL_CONTEXT (decl));
6802 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6803 METHOD_TYPE for a non-static member function; QUALS are the
6804 cv-qualifiers that apply to the function. */
6807 build_this_parm (tree type, cp_cv_quals quals)
6812 cp_cv_quals this_quals;
6814 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6815 /* The `this' parameter is implicitly `const'; it cannot be
6817 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6818 qual_type = cp_build_qualified_type (this_type, this_quals);
6819 parm = build_artificial_parm (this_identifier, qual_type);
6820 cp_apply_type_quals_to_decl (this_quals, parm);
6824 /* CTYPE is class type, or null if non-class.
6825 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6827 DECLARATOR is the function's name.
6828 PARMS is a chain of PARM_DECLs for the function.
6829 VIRTUALP is truthvalue of whether the function is virtual or not.
6830 FLAGS are to be passed through to `grokclassfn'.
6831 QUALS are qualifiers indicating whether the function is `const'
6833 RAISES is a list of exceptions that this function can raise.
6834 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6835 not look, and -1 if we should not call `grokclassfn' at all.
6837 SFK is the kind of special function (if any) for the new function.
6839 Returns `NULL_TREE' if something goes wrong, after issuing
6840 applicable error messages. */
6843 grokfndecl (tree ctype,
6847 tree orig_declarator,
6849 enum overload_flags flags,
6856 special_function_kind sfk,
6861 location_t location)
6864 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6868 type = build_exception_variant (type, raises);
6870 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6872 /* If we have an explicit location, use it, otherwise use whatever
6873 build_lang_decl used (probably input_location). */
6874 if (location != UNKNOWN_LOCATION)
6875 DECL_SOURCE_LOCATION (decl) = location;
6877 if (TREE_CODE (type) == METHOD_TYPE)
6880 parm = build_this_parm (type, quals);
6881 DECL_CHAIN (parm) = parms;
6884 DECL_ARGUMENTS (decl) = parms;
6885 for (t = parms; t; t = DECL_CHAIN (t))
6886 DECL_CONTEXT (t) = decl;
6887 /* Propagate volatile out from type to decl. */
6888 if (TYPE_VOLATILE (type))
6889 TREE_THIS_VOLATILE (decl) = 1;
6891 /* Setup decl according to sfk. */
6894 case sfk_constructor:
6895 case sfk_copy_constructor:
6896 case sfk_move_constructor:
6897 DECL_CONSTRUCTOR_P (decl) = 1;
6899 case sfk_destructor:
6900 DECL_DESTRUCTOR_P (decl) = 1;
6906 /* If pointers to member functions use the least significant bit to
6907 indicate whether a function is virtual, ensure a pointer
6908 to this function will have that bit clear. */
6909 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6910 && TREE_CODE (type) == METHOD_TYPE
6911 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6912 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6915 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6919 ("defining explicit specialization %qD in friend declaration",
6923 tree fns = TREE_OPERAND (orig_declarator, 0);
6924 tree args = TREE_OPERAND (orig_declarator, 1);
6926 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6928 /* Something like `template <class T> friend void f<T>()'. */
6929 error ("invalid use of template-id %qD in declaration "
6930 "of primary template",
6936 /* A friend declaration of the form friend void f<>(). Record
6937 the information in the TEMPLATE_ID_EXPR. */
6938 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6940 if (TREE_CODE (fns) == COMPONENT_REF)
6942 /* Due to bison parser ickiness, we will have already looked
6943 up an operator_name or PFUNCNAME within the current class
6944 (see template_id in parse.y). If the current class contains
6945 such a name, we'll get a COMPONENT_REF here. Undo that. */
6947 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6948 == current_class_type);
6949 fns = TREE_OPERAND (fns, 1);
6951 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6952 || TREE_CODE (fns) == OVERLOAD);
6953 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6955 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6956 if (TREE_PURPOSE (t)
6957 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6959 error ("default arguments are not allowed in declaration "
6960 "of friend template specialization %qD",
6967 error ("%<inline%> is not allowed in declaration of friend "
6968 "template specialization %qD",
6975 /* If this decl has namespace scope, set that up. */
6977 set_decl_namespace (decl, in_namespace, friendp);
6979 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6981 /* `main' and builtins have implicit 'C' linkage. */
6982 if ((MAIN_NAME_P (declarator)
6983 || (IDENTIFIER_LENGTH (declarator) > 10
6984 && IDENTIFIER_POINTER (declarator)[0] == '_'
6985 && IDENTIFIER_POINTER (declarator)[1] == '_'
6986 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6987 && current_lang_name == lang_name_cplusplus
6988 && ctype == NULL_TREE
6989 && DECL_FILE_SCOPE_P (decl))
6990 SET_DECL_LANGUAGE (decl, lang_c);
6992 /* Should probably propagate const out from type to decl I bet (mrs). */
6995 DECL_STATIC_FUNCTION_P (decl) = 1;
6996 DECL_CONTEXT (decl) = ctype;
7001 DECL_CONTEXT (decl) = ctype;
7003 check_class_member_definition_namespace (decl);
7006 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7008 if (processing_template_decl)
7009 error ("cannot declare %<::main%> to be a template");
7011 error ("cannot declare %<::main%> to be inline");
7013 error ("cannot declare %<::main%> to be static");
7018 /* Members of anonymous types and local classes have no linkage; make
7019 them internal. If a typedef is made later, this will be changed. */
7020 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7021 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7024 if (publicp && cxx_dialect == cxx98)
7026 /* [basic.link]: A name with no linkage (notably, the name of a class
7027 or enumeration declared in a local scope) shall not be used to
7028 declare an entity with linkage.
7030 DR 757 relaxes this restriction for C++0x. */
7031 t = no_linkage_check (TREE_TYPE (decl),
7032 /*relaxed_p=*/false);
7035 if (TYPE_ANONYMOUS_P (t))
7037 if (DECL_EXTERN_C_P (decl))
7038 /* Allow this; it's pretty common in C. */;
7041 permerror (input_location, "anonymous type with no linkage "
7042 "used to declare function %q#D with linkage",
7044 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7045 permerror (input_location, "%q+#D does not refer to the unqualified "
7046 "type, so it is not used for linkage",
7051 permerror (input_location, "type %qT with no linkage used to "
7052 "declare function %q#D with linkage", t, decl);
7056 TREE_PUBLIC (decl) = publicp;
7059 DECL_INTERFACE_KNOWN (decl) = 1;
7060 DECL_NOT_REALLY_EXTERN (decl) = 1;
7063 /* If the declaration was declared inline, mark it as such. */
7065 DECL_DECLARED_INLINE_P (decl) = 1;
7067 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7069 DECL_EXTERNAL (decl) = 1;
7070 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7073 ? G_("static member function %qD cannot have cv-qualifier")
7074 : G_("non-member function %qD cannot have cv-qualifier"),
7076 quals = TYPE_UNQUALIFIED;
7079 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7080 && !grok_op_properties (decl, /*complain=*/true))
7084 /* Make the init_value nonzero so pushdecl knows this is not
7085 tentative. error_mark_node is replaced later with the BLOCK. */
7086 DECL_INITIAL (decl) = error_mark_node;
7088 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7089 TREE_NOTHROW (decl) = 1;
7091 /* Caller will do the rest of this. */
7095 if (ctype != NULL_TREE)
7096 grokclassfn (ctype, decl, flags);
7098 decl = check_explicit_specialization (orig_declarator, decl,
7101 4 * (friendp != 0));
7102 if (decl == error_mark_node)
7107 cplus_decl_attributes (&decl, *attrlist, 0);
7108 *attrlist = NULL_TREE;
7111 /* Check main's type after attributes have been applied. */
7112 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7114 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7117 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7119 error ("%<::main%> must return %<int%>");
7120 newtype = build_function_type (integer_type_node, oldtypeargs);
7121 TREE_TYPE (decl) = newtype;
7124 check_main_parameter_types (decl);
7127 if (ctype != NULL_TREE
7128 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7131 tree old_decl = check_classfn (ctype, decl,
7132 (processing_template_decl
7133 > template_class_depth (ctype))
7134 ? current_template_parms
7137 if (old_decl == error_mark_node)
7145 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7146 /* Because grokfndecl is always supposed to return a
7147 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7148 here. We depend on our callers to figure out that its
7149 really a template that's being returned. */
7150 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7152 if (DECL_STATIC_FUNCTION_P (old_decl)
7153 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7154 /* Remove the `this' parm added by grokclassfn.
7155 XXX Isn't this done in start_function, too? */
7156 revert_static_member_fn (decl);
7157 if (DECL_ARTIFICIAL (old_decl))
7159 error ("definition of implicitly-declared %qD", old_decl);
7163 /* Since we've smashed OLD_DECL to its
7164 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7165 if (TREE_CODE (decl) == TEMPLATE_DECL)
7166 decl = DECL_TEMPLATE_RESULT (decl);
7168 /* Attempt to merge the declarations. This can fail, in
7169 the case of some invalid specialization declarations. */
7170 pushed_scope = push_scope (ctype);
7171 ok = duplicate_decls (decl, old_decl, friendp);
7173 pop_scope (pushed_scope);
7176 error ("no %q#D member function declared in class %qT",
7184 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7187 if (ctype == NULL_TREE || check)
7191 DECL_VIRTUAL_P (decl) = 1;
7196 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7197 the linkage that DECL will receive in the object file. */
7200 set_linkage_for_static_data_member (tree decl)
7202 /* A static data member always has static storage duration and
7203 external linkage. Note that static data members are forbidden in
7204 local classes -- the only situation in which a class has
7205 non-external linkage. */
7206 TREE_PUBLIC (decl) = 1;
7207 TREE_STATIC (decl) = 1;
7208 /* For non-template classes, static data members are always put
7209 out in exactly those files where they are defined, just as
7210 with ordinary namespace-scope variables. */
7211 if (!processing_template_decl)
7212 DECL_INTERFACE_KNOWN (decl) = 1;
7215 /* Create a VAR_DECL named NAME with the indicated TYPE.
7217 If SCOPE is non-NULL, it is the class type or namespace containing
7218 the variable. If SCOPE is NULL, the variable should is created in
7219 the innermost enclosings scope. */
7222 grokvardecl (tree type,
7224 const cp_decl_specifier_seq *declspecs,
7230 tree explicit_scope;
7232 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7234 /* Compute the scope in which to place the variable, but remember
7235 whether or not that scope was explicitly specified by the user. */
7236 explicit_scope = scope;
7239 /* An explicit "extern" specifier indicates a namespace-scope
7241 if (declspecs->storage_class == sc_extern)
7242 scope = current_decl_namespace ();
7243 else if (!at_function_scope_p ())
7244 scope = current_scope ();
7248 && (/* If the variable is a namespace-scope variable declared in a
7249 template, we need DECL_LANG_SPECIFIC. */
7250 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7251 /* Similarly for namespace-scope variables with language linkage
7253 || (TREE_CODE (scope) == NAMESPACE_DECL
7254 && current_lang_name != lang_name_cplusplus)
7255 /* Similarly for static data members. */
7257 decl = build_lang_decl (VAR_DECL, name, type);
7259 decl = build_decl (input_location, VAR_DECL, name, type);
7261 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7262 set_decl_namespace (decl, explicit_scope, 0);
7264 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7266 if (declspecs->storage_class == sc_extern)
7268 DECL_THIS_EXTERN (decl) = 1;
7269 DECL_EXTERNAL (decl) = !initialized;
7272 if (DECL_CLASS_SCOPE_P (decl))
7274 set_linkage_for_static_data_member (decl);
7275 /* This function is only called with out-of-class definitions. */
7276 DECL_EXTERNAL (decl) = 0;
7277 check_class_member_definition_namespace (decl);
7279 /* At top level, either `static' or no s.c. makes a definition
7280 (perhaps tentative), and absence of `static' makes it public. */
7281 else if (toplevel_bindings_p ())
7283 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7284 && (DECL_THIS_EXTERN (decl) || ! constp));
7285 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7287 /* Not at top level, only `static' makes a static definition. */
7290 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7291 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7294 if (declspecs->specs[(int)ds_thread])
7295 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7297 /* If the type of the decl has no linkage, make sure that we'll
7298 notice that in mark_used. */
7299 if (cxx_dialect > cxx98
7300 && decl_linkage (decl) != lk_none
7301 && DECL_LANG_SPECIFIC (decl) == NULL
7302 && !DECL_EXTERN_C_P (decl)
7303 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7304 retrofit_lang_decl (decl);
7306 if (TREE_PUBLIC (decl))
7308 /* [basic.link]: A name with no linkage (notably, the name of a class
7309 or enumeration declared in a local scope) shall not be used to
7310 declare an entity with linkage.
7312 DR 757 relaxes this restriction for C++0x. */
7313 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7314 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7317 if (TYPE_ANONYMOUS_P (t))
7319 if (DECL_EXTERN_C_P (decl))
7320 /* Allow this; it's pretty common in C. */
7324 /* DRs 132, 319 and 389 seem to indicate types with
7325 no linkage can only be used to declare extern "C"
7326 entities. Since it's not always an error in the
7327 ISO C++ 90 Standard, we only issue a warning. */
7328 warning (0, "anonymous type with no linkage used to declare "
7329 "variable %q#D with linkage", decl);
7330 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7331 warning (0, "%q+#D does not refer to the unqualified "
7332 "type, so it is not used for linkage",
7337 warning (0, "type %qT with no linkage used to declare variable "
7338 "%q#D with linkage", t, decl);
7342 DECL_INTERFACE_KNOWN (decl) = 1;
7347 /* Create and return a canonical pointer to member function type, for
7348 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7351 build_ptrmemfunc_type (tree type)
7355 tree unqualified_variant = NULL_TREE;
7357 if (type == error_mark_node)
7360 /* If a canonical type already exists for this type, use it. We use
7361 this method instead of type_hash_canon, because it only does a
7362 simple equality check on the list of field members. */
7364 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7367 /* Make sure that we always have the unqualified pointer-to-member
7369 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7371 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7373 t = make_class_type (RECORD_TYPE);
7374 xref_basetypes (t, NULL_TREE);
7376 /* Let the front end know this is a pointer to member function... */
7377 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7378 /* ... and not really a class type. */
7379 SET_CLASS_TYPE_P (t, 0);
7381 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7384 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7386 DECL_CHAIN (field) = fields;
7389 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7391 /* Zap out the name so that the back end will give us the debugging
7392 information for this anonymous RECORD_TYPE. */
7393 TYPE_NAME (t) = NULL_TREE;
7395 /* If this is not the unqualified form of this pointer-to-member
7396 type, set the TYPE_MAIN_VARIANT for this type to be the
7397 unqualified type. Since they are actually RECORD_TYPEs that are
7398 not variants of each other, we must do this manually.
7399 As we just built a new type there is no need to do yet another copy. */
7400 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7402 int type_quals = cp_type_quals (type);
7403 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7404 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7405 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7406 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7407 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7408 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7409 TREE_TYPE (TYPE_BINFO (t)) = t;
7412 /* Cache this pointer-to-member type so that we can find it again
7414 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7416 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7417 SET_TYPE_STRUCTURAL_EQUALITY (t);
7418 else if (TYPE_CANONICAL (type) != type)
7419 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7424 /* Create and return a pointer to data member type. */
7427 build_ptrmem_type (tree class_type, tree member_type)
7429 if (TREE_CODE (member_type) == METHOD_TYPE)
7431 cp_cv_quals quals = type_memfn_quals (member_type);
7432 member_type = build_memfn_type (member_type, class_type, quals);
7433 return build_ptrmemfunc_type (build_pointer_type (member_type));
7437 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7438 return build_offset_type (class_type, member_type);
7442 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7443 Check to see that the definition is valid. Issue appropriate error
7444 messages. Return 1 if the definition is particularly bad, or 0
7448 check_static_variable_definition (tree decl, tree type)
7450 /* If DECL is declared constexpr, we'll do the appropriate checks
7451 in check_initializer. */
7452 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7454 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7456 if (literal_type_p (type))
7457 error ("%<constexpr%> needed for in-class initialization of static "
7458 "data member %q#D of non-integral type", decl);
7460 error ("in-class initialization of static data member %q#D of "
7461 "non-literal type", decl);
7465 /* Motion 10 at San Diego: If a static const integral data member is
7466 initialized with an integral constant expression, the initializer
7467 may appear either in the declaration (within the class), or in
7468 the definition, but not both. If it appears in the class, the
7469 member is a member constant. The file-scope definition is always
7471 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7473 error ("invalid in-class initialization of static data member "
7474 "of non-integral type %qT",
7478 else if (!CP_TYPE_CONST_P (type))
7479 error ("ISO C++ forbids in-class initialization of non-const "
7480 "static member %qD",
7482 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7483 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7484 "%qD of non-integral type %qT", decl, type);
7489 /* Given the SIZE (i.e., number of elements) in an array, compute an
7490 appropriate index type for the array. If non-NULL, NAME is the
7491 name of the thing being declared. */
7494 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7499 tree abi_1_itype = NULL_TREE;
7501 if (error_operand_p (size))
7502 return error_mark_node;
7504 type = TREE_TYPE (size);
7505 /* type_dependent_expression_p? */
7506 if (!dependent_type_p (type))
7508 mark_rvalue_use (size);
7510 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7511 && TREE_SIDE_EFFECTS (size))
7512 /* In C++98, we mark a non-constant array bound with a magic
7513 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7516 size = fold_non_dependent_expr (size);
7518 if (CLASS_TYPE_P (type)
7519 && CLASSTYPE_LITERAL_P (type))
7521 size = build_expr_type_conversion (WANT_INT, size, true);
7522 if (size == error_mark_node)
7523 return error_mark_node;
7524 type = TREE_TYPE (size);
7527 size = maybe_constant_value (size);
7530 if (error_operand_p (size))
7531 return error_mark_node;
7533 /* The array bound must be an integer type. */
7534 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7536 if (!(complain & tf_error))
7537 return error_mark_node;
7539 error ("size of array %qD has non-integral type %qT", name, type);
7541 error ("size of array has non-integral type %qT", type);
7542 size = integer_one_node;
7543 type = TREE_TYPE (size);
7547 /* A type is dependent if it is...an array type constructed from any
7548 dependent type or whose size is specified by a constant expression
7549 that is value-dependent. */
7550 /* We can only call value_dependent_expression_p on integral constant
7551 expressions; treat non-constant expressions as dependent, too. */
7552 if (processing_template_decl
7553 && (dependent_type_p (type)
7554 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7556 /* We cannot do any checking for a SIZE that isn't known to be
7557 constant. Just build the index type and mark that it requires
7558 structural equality checks. */
7559 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7560 size, integer_one_node));
7561 TYPE_DEPENDENT_P (itype) = 1;
7562 TYPE_DEPENDENT_P_VALID (itype) = 1;
7563 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7567 if (!abi_version_at_least (2) && processing_template_decl)
7568 /* For abi-1, we handled all instances in templates the same way,
7569 even when they were non-dependent. This affects the manglings
7570 produced. So, we do the normal checking for non-dependent
7571 sizes, but at the end we'll return the same type that abi-1
7572 would have, but with TYPE_CANONICAL set to the "right"
7573 value that the current ABI would provide. */
7574 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7575 osize, integer_one_node));
7577 /* Normally, the array-bound will be a constant. */
7578 if (TREE_CODE (size) == INTEGER_CST)
7580 /* Check to see if the array bound overflowed. Make that an
7581 error, no matter how generous we're being. */
7582 constant_expression_error (size);
7584 /* An array must have a positive number of elements. */
7585 if (INT_CST_LT (size, integer_zero_node))
7587 if (!(complain & tf_error))
7588 return error_mark_node;
7590 error ("size of array %qD is negative", name);
7592 error ("size of array is negative");
7593 size = integer_one_node;
7595 /* As an extension we allow zero-sized arrays. */
7596 else if (integer_zerop (size))
7598 if (!(complain & tf_error))
7599 /* We must fail if performing argument deduction (as
7600 indicated by the state of complain), so that
7601 another substitution can be found. */
7602 return error_mark_node;
7603 else if (in_system_header)
7604 /* Allow them in system headers because glibc uses them. */;
7606 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7608 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7611 else if (TREE_CONSTANT (size)
7612 /* We don't allow VLAs at non-function scopes, or during
7613 tentative template substitution. */
7614 || !at_function_scope_p () || !(complain & tf_error))
7616 if (!(complain & tf_error))
7617 return error_mark_node;
7618 /* `(int) &fn' is not a valid array bound. */
7620 error ("size of array %qD is not an integral constant-expression",
7623 error ("size of array is not an integral constant-expression");
7624 size = integer_one_node;
7626 else if (pedantic && warn_vla != 0)
7629 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7631 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7633 else if (warn_vla > 0)
7637 "variable length array %qD is used", name);
7640 "variable length array is used");
7643 if (processing_template_decl && !TREE_CONSTANT (size))
7644 /* A variable sized array. */
7645 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7648 HOST_WIDE_INT saved_processing_template_decl;
7650 /* Compute the index of the largest element in the array. It is
7651 one less than the number of elements in the array. We save
7652 and restore PROCESSING_TEMPLATE_DECL so that computations in
7653 cp_build_binary_op will be appropriately folded. */
7654 saved_processing_template_decl = processing_template_decl;
7655 processing_template_decl = 0;
7656 itype = cp_build_binary_op (input_location,
7658 cp_convert (ssizetype, size),
7659 cp_convert (ssizetype, integer_one_node),
7660 tf_warning_or_error);
7661 itype = fold (itype);
7662 processing_template_decl = saved_processing_template_decl;
7664 if (!TREE_CONSTANT (itype))
7665 /* A variable sized array. */
7666 itype = variable_size (itype);
7667 /* Make sure that there was no overflow when creating to a signed
7668 index type. (For example, on a 32-bit machine, an array with
7669 size 2^32 - 1 is too big.) */
7670 else if (TREE_CODE (itype) == INTEGER_CST
7671 && TREE_OVERFLOW (itype))
7673 if (!(complain & tf_error))
7674 return error_mark_node;
7675 error ("overflow in array dimension");
7676 TREE_OVERFLOW (itype) = 0;
7680 /* Create and return the appropriate index type. */
7683 tree t = build_index_type (itype);
7684 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7685 itype = abi_1_itype;
7688 itype = build_index_type (itype);
7690 /* If the index type were dependent, we would have returned early, so
7691 remember that it isn't. */
7692 TYPE_DEPENDENT_P (itype) = 0;
7693 TYPE_DEPENDENT_P_VALID (itype) = 1;
7697 /* Returns the scope (if any) in which the entity declared by
7698 DECLARATOR will be located. If the entity was declared with an
7699 unqualified name, NULL_TREE is returned. */
7702 get_scope_of_declarator (const cp_declarator *declarator)
7704 while (declarator && declarator->kind != cdk_id)
7705 declarator = declarator->declarator;
7707 /* If the declarator-id is a SCOPE_REF, the scope in which the
7708 declaration occurs is the first operand. */
7710 && declarator->u.id.qualifying_scope)
7711 return declarator->u.id.qualifying_scope;
7713 /* Otherwise, the declarator is not a qualified name; the entity will
7714 be declared in the current scope. */
7718 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7719 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7723 create_array_type_for_decl (tree name, tree type, tree size)
7725 tree itype = NULL_TREE;
7727 /* If things have already gone awry, bail now. */
7728 if (type == error_mark_node || size == error_mark_node)
7729 return error_mark_node;
7731 /* If there are some types which cannot be array elements,
7732 issue an error-message and return. */
7733 switch (TREE_CODE (type))
7737 error ("declaration of %qD as array of void", name);
7739 error ("creating array of void");
7740 return error_mark_node;
7744 error ("declaration of %qD as array of functions", name);
7746 error ("creating array of functions");
7747 return error_mark_node;
7749 case REFERENCE_TYPE:
7751 error ("declaration of %qD as array of references", name);
7753 error ("creating array of references");
7754 return error_mark_node;
7758 error ("declaration of %qD as array of function members", name);
7760 error ("creating array of function members");
7761 return error_mark_node;
7769 The constant expressions that specify the bounds of the arrays
7770 can be omitted only for the first member of the sequence. */
7771 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7774 error ("declaration of %qD as multidimensional array must "
7775 "have bounds for all dimensions except the first",
7778 error ("multidimensional array must have bounds for all "
7779 "dimensions except the first");
7781 return error_mark_node;
7784 /* Figure out the index type for the array. */
7786 itype = compute_array_index_type (name, size, tf_warning_or_error);
7789 T is called the array element type; this type shall not be [...] an
7790 abstract class type. */
7791 abstract_virtuals_error (name, type);
7793 return build_cplus_array_type (type, itype);
7796 /* Check that it's OK to declare a function with the indicated TYPE.
7797 SFK indicates the kind of special function (if any) that this
7798 function is. OPTYPE is the type given in a conversion operator
7799 declaration, or the class type for a constructor/destructor.
7800 Returns the actual return type of the function; that
7801 may be different than TYPE if an error occurs, or for certain
7802 special functions. */
7805 check_special_function_return_type (special_function_kind sfk,
7811 case sfk_constructor:
7813 error ("return type specification for constructor invalid");
7815 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7816 type = build_pointer_type (optype);
7818 type = void_type_node;
7821 case sfk_destructor:
7823 error ("return type specification for destructor invalid");
7824 /* We can't use the proper return type here because we run into
7825 problems with ambiguous bases and covariant returns.
7826 Java classes are left unchanged because (void *) isn't a valid
7827 Java type, and we don't want to change the Java ABI. */
7828 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7829 type = build_pointer_type (void_type_node);
7831 type = void_type_node;
7834 case sfk_conversion:
7836 error ("return type specified for %<operator %T%>", optype);
7847 /* A variable or data member (whose unqualified name is IDENTIFIER)
7848 has been declared with the indicated TYPE. If the TYPE is not
7849 acceptable, issue an error message and return a type to use for
7850 error-recovery purposes. */
7853 check_var_type (tree identifier, tree type)
7855 if (VOID_TYPE_P (type))
7858 error ("unnamed variable or field declared void");
7859 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7861 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7862 error ("variable or field %qE declared void", identifier);
7865 error ("variable or field declared void");
7866 type = error_mark_node;
7872 /* Given declspecs and a declarator (abstract or otherwise), determine
7873 the name and type of the object declared and construct a DECL node
7876 DECLSPECS points to the representation of declaration-specifier
7877 sequence that precedes declarator.
7879 DECL_CONTEXT says which syntactic context this declaration is in:
7880 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7881 FUNCDEF for a function definition. Like NORMAL but a few different
7882 error messages in each case. Return value may be zero meaning
7883 this definition is too screwy to try to parse.
7884 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7885 handle member functions (which have FIELD context).
7886 Return value may be zero meaning this definition is too screwy to
7888 PARM for a parameter declaration (either within a function prototype
7889 or before a function body). Make a PARM_DECL, or return void_type_node.
7890 TPARM for a template parameter declaration.
7891 CATCHPARM for a parameter declaration before a catch clause.
7892 TYPENAME if for a typename (in a cast or sizeof).
7893 Don't make a DECL node; just return the ..._TYPE node.
7894 FIELD for a struct or union field; make a FIELD_DECL.
7895 BITFIELD for a field with specified width.
7897 INITIALIZED is as for start_decl.
7899 ATTRLIST is a pointer to the list of attributes, which may be NULL
7900 if there are none; *ATTRLIST may be modified if attributes from inside
7901 the declarator should be applied to the declaration.
7903 When this function is called, scoping variables (such as
7904 CURRENT_CLASS_TYPE) should reflect the scope in which the
7905 declaration occurs, not the scope in which the new declaration will
7906 be placed. For example, on:
7910 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7913 Returns a DECL (if a declarator is present), a TYPE (if there is no
7914 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7918 grokdeclarator (const cp_declarator *declarator,
7919 const cp_decl_specifier_seq *declspecs,
7920 enum decl_context decl_context,
7924 tree type = NULL_TREE;
7926 int explicit_int128 = 0;
7927 int virtualp, explicitp, friendp, inlinep, staticp;
7928 int explicit_int = 0;
7929 int explicit_char = 0;
7930 int defaulted_int = 0;
7931 tree dependent_name = NULL_TREE;
7933 tree typedef_decl = NULL_TREE;
7934 const char *name = NULL;
7935 tree typedef_type = NULL_TREE;
7936 /* True if this declarator is a function definition. */
7937 bool funcdef_flag = false;
7938 cp_declarator_kind innermost_code = cdk_error;
7941 /* See the code below that used this. */
7942 tree decl_attr = NULL_TREE;
7945 /* Keep track of what sort of function is being processed
7946 so that we can warn about default return values, or explicit
7947 return values which do not match prescribed defaults. */
7948 special_function_kind sfk = sfk_none;
7950 tree dname = NULL_TREE;
7951 tree ctor_return_type = NULL_TREE;
7952 enum overload_flags flags = NO_SPECIAL;
7953 /* cv-qualifiers that apply to the declarator, for a declaration of
7954 a member function. */
7955 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7956 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7958 tree raises = NULL_TREE;
7959 int template_count = 0;
7960 tree returned_attrs = NULL_TREE;
7961 tree parms = NULL_TREE;
7962 const cp_declarator *id_declarator;
7963 /* The unqualified name of the declarator; either an
7964 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7965 tree unqualified_id;
7966 /* The class type, if any, in which this entity is located,
7967 or NULL_TREE if none. Note that this value may be different from
7968 the current class type; for example if an attempt is made to declare
7969 "A::f" inside "B", this value will be "A". */
7970 tree ctype = current_class_type;
7971 /* The NAMESPACE_DECL for the namespace in which this entity is
7972 located. If an unqualified name is used to declare the entity,
7973 this value will be NULL_TREE, even if the entity is located at
7975 tree in_namespace = NULL_TREE;
7976 cp_storage_class storage_class;
7977 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7978 bool type_was_error_mark_node = false;
7979 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7980 bool template_type_arg = false;
7981 bool template_parm_flag = false;
7982 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7985 signed_p = declspecs->specs[(int)ds_signed];
7986 unsigned_p = declspecs->specs[(int)ds_unsigned];
7987 short_p = declspecs->specs[(int)ds_short];
7988 long_p = declspecs->specs[(int)ds_long];
7989 longlong = declspecs->specs[(int)ds_long] >= 2;
7990 explicit_int128 = declspecs->explicit_int128_p;
7991 thread_p = declspecs->specs[(int)ds_thread];
7993 if (decl_context == FUNCDEF)
7994 funcdef_flag = true, decl_context = NORMAL;
7995 else if (decl_context == MEMFUNCDEF)
7996 funcdef_flag = true, decl_context = FIELD;
7997 else if (decl_context == BITFIELD)
7998 bitfield = 1, decl_context = FIELD;
7999 else if (decl_context == TEMPLATE_TYPE_ARG)
8000 template_type_arg = true, decl_context = TYPENAME;
8001 else if (decl_context == TPARM)
8002 template_parm_flag = true, decl_context = PARM;
8004 if (initialized > 1)
8005 funcdef_flag = true;
8007 /* Look inside a declarator for the name being declared
8008 and get it as a string, for an error message. */
8009 for (id_declarator = declarator;
8011 id_declarator = id_declarator->declarator)
8013 if (id_declarator->kind != cdk_id)
8014 innermost_code = id_declarator->kind;
8016 switch (id_declarator->kind)
8019 if (id_declarator->declarator
8020 && id_declarator->declarator->kind == cdk_id)
8022 sfk = id_declarator->declarator->u.id.sfk;
8023 if (sfk == sfk_destructor)
8030 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8031 tree decl = id_declarator->u.id.unqualified_name;
8034 if (qualifying_scope)
8036 if (at_function_scope_p ())
8040 A declarator-id shall not be qualified except
8043 None of the cases are permitted in block
8045 if (qualifying_scope == global_namespace)
8046 error ("invalid use of qualified-name %<::%D%>",
8048 else if (TYPE_P (qualifying_scope))
8049 error ("invalid use of qualified-name %<%T::%D%>",
8050 qualifying_scope, decl);
8052 error ("invalid use of qualified-name %<%D::%D%>",
8053 qualifying_scope, decl);
8054 return error_mark_node;
8056 else if (TYPE_P (qualifying_scope))
8058 ctype = qualifying_scope;
8059 if (innermost_code != cdk_function
8060 && current_class_type
8061 && !UNIQUELY_DERIVED_FROM_P (ctype,
8062 current_class_type))
8064 error ("type %qT is not derived from type %qT",
8065 ctype, current_class_type);
8066 return error_mark_node;
8069 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8070 in_namespace = qualifying_scope;
8072 switch (TREE_CODE (decl))
8078 if (innermost_code != cdk_function)
8080 error ("declaration of %qD as non-function", decl);
8081 return error_mark_node;
8083 else if (!qualifying_scope
8084 && !(current_class_type && at_class_scope_p ()))
8086 error ("declaration of %qD as non-member", decl);
8087 return error_mark_node;
8090 type = TREE_OPERAND (decl, 0);
8092 type = constructor_name (type);
8093 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8098 case TEMPLATE_ID_EXPR:
8100 tree fns = TREE_OPERAND (decl, 0);
8103 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8105 gcc_assert (is_overloaded_fn (dname));
8106 dname = DECL_NAME (get_first_fn (dname));
8111 case IDENTIFIER_NODE:
8112 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8115 if (C_IS_RESERVED_WORD (dname))
8117 error ("declarator-id missing; using reserved word %qD",
8119 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8121 else if (!IDENTIFIER_TYPENAME_P (dname))
8122 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8125 gcc_assert (flags == NO_SPECIAL);
8126 flags = TYPENAME_FLAG;
8127 ctor_return_type = TREE_TYPE (dname);
8128 sfk = sfk_conversion;
8129 if (is_typename_at_global_scope (dname))
8130 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8132 name = "<invalid operator>";
8149 return error_mark_node;
8154 if (id_declarator->kind == cdk_id)
8160 The declarator in a function-definition shall have the form
8161 D1 ( parameter-declaration-clause) ... */
8162 if (funcdef_flag && innermost_code != cdk_function)
8164 error ("function definition does not declare parameters");
8165 return error_mark_node;
8168 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8169 && innermost_code != cdk_function
8170 && ! (ctype && !declspecs->any_specifiers_p))
8172 error ("declaration of %qD as non-function", dname);
8173 return error_mark_node;
8176 /* Anything declared one level down from the top level
8177 must be one of the parameters of a function
8178 (because the body is at least two levels down). */
8180 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8181 by not allowing C++ class definitions to specify their parameters
8182 with xdecls (must be spec.d in the parmlist).
8184 Since we now wait to push a class scope until we are sure that
8185 we are in a legitimate method context, we must set oldcname
8186 explicitly (since current_class_name is not yet alive).
8188 We also want to avoid calling this a PARM if it is in a namespace. */
8190 if (decl_context == NORMAL && !toplevel_bindings_p ())
8192 struct cp_binding_level *b = current_binding_level;
8193 current_binding_level = b->level_chain;
8194 if (current_binding_level != 0 && toplevel_bindings_p ())
8195 decl_context = PARM;
8196 current_binding_level = b;
8200 name = decl_context == PARM ? "parameter" : "type name";
8202 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8204 error ("%<constexpr%> cannot appear in a typedef declaration");
8205 return error_mark_node;
8208 /* If there were multiple types specified in the decl-specifier-seq,
8209 issue an error message. */
8210 if (declspecs->multiple_types_p)
8212 error ("two or more data types in declaration of %qs", name);
8213 return error_mark_node;
8216 if (declspecs->conflicting_specifiers_p)
8218 error ("conflicting specifiers in declaration of %qs", name);
8219 return error_mark_node;
8222 /* Extract the basic type from the decl-specifier-seq. */
8223 type = declspecs->type;
8224 if (type == error_mark_node)
8227 type_was_error_mark_node = true;
8229 /* If the entire declaration is itself tagged as deprecated then
8230 suppress reports of deprecated items. */
8231 if (type && TREE_DEPRECATED (type)
8232 && deprecated_state != DEPRECATED_SUPPRESS)
8233 warn_deprecated_use (type, NULL_TREE);
8234 if (type && TREE_CODE (type) == TYPE_DECL)
8236 typedef_decl = type;
8237 type = TREE_TYPE (typedef_decl);
8238 if (TREE_DEPRECATED (type)
8239 && DECL_ARTIFICIAL (typedef_decl)
8240 && deprecated_state != DEPRECATED_SUPPRESS)
8241 warn_deprecated_use (type, NULL_TREE);
8243 /* No type at all: default to `int', and set DEFAULTED_INT
8244 because it was not a user-defined typedef. */
8245 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8247 /* These imply 'int'. */
8248 type = integer_type_node;
8252 explicit_int = declspecs->explicit_int_p;
8253 explicit_char = declspecs->explicit_char_p;
8256 /* See the code below that used this. */
8258 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8260 typedef_type = type;
8263 if (sfk != sfk_conversion)
8264 ctor_return_type = ctype;
8266 if (sfk != sfk_none)
8267 type = check_special_function_return_type (sfk, type,
8269 else if (type == NULL_TREE)
8275 /* We handle `main' specially here, because 'main () { }' is so
8276 common. With no options, it is allowed. With -Wreturn-type,
8277 it is a warning. It is only an error with -pedantic-errors. */
8278 is_main = (funcdef_flag
8279 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8280 && MAIN_NAME_P (dname)
8281 && ctype == NULL_TREE
8282 && in_namespace == NULL_TREE
8283 && current_namespace == global_namespace);
8285 if (type_was_error_mark_node)
8286 /* We've already issued an error, don't complain more. */;
8287 else if (in_system_header || flag_ms_extensions)
8288 /* Allow it, sigh. */;
8290 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8292 pedwarn (input_location, OPT_pedantic,
8293 "ISO C++ forbids declaration of %qs with no type", name);
8295 warning (OPT_Wreturn_type,
8296 "ISO C++ forbids declaration of %qs with no type", name);
8298 type = integer_type_node;
8303 /* Now process the modifiers that were specified
8304 and check for invalid combinations. */
8306 /* Long double is a special combination. */
8307 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8310 type = cp_build_qualified_type (long_double_type_node,
8311 cp_type_quals (type));
8314 /* Check all other uses of type modifiers. */
8316 if (unsigned_p || signed_p || long_p || short_p)
8320 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8321 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8322 else if (signed_p && unsigned_p)
8323 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8324 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8325 error ("%<long long%> invalid for %qs", name);
8326 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8327 error ("%<__int128%> invalid for %qs", name);
8328 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8329 error ("%<long%> invalid for %qs", name);
8330 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8331 error ("%<short%> invalid for %qs", name);
8332 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8333 error ("%<long%> or %<short%> invalid for %qs", name);
8334 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8335 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8336 else if ((long_p || short_p) && explicit_char)
8337 error ("%<long%> or %<short%> specified with char for %qs", name);
8338 else if (long_p && short_p)
8339 error ("%<long%> and %<short%> specified together for %qs", name);
8340 else if (type == char16_type_node || type == char32_type_node)
8342 if (signed_p || unsigned_p)
8343 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8344 else if (short_p || long_p)
8345 error ("%<short%> or %<long%> invalid for %qs", name);
8350 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8352 pedwarn (input_location, OPT_pedantic,
8353 "long, short, signed or unsigned used invalidly for %qs",
8355 if (flag_pedantic_errors)
8358 if (explicit_int128)
8360 if (int128_integer_type_node == NULL_TREE)
8362 error ("%<__int128%> is not supported by this target");
8367 pedwarn (input_location, OPT_pedantic,
8368 "ISO C++ does not support %<__int128%> for %qs",
8370 if (flag_pedantic_errors)
8376 /* Discard the type modifiers if they are invalid. */
8384 explicit_int128 = false;
8388 /* Decide whether an integer type is signed or not.
8389 Optionally treat bitfields as signed by default. */
8393 It is implementation-defined whether a plain (neither
8394 explicitly signed or unsigned) char, short, int, or long
8395 bit-field is signed or unsigned.
8397 Naturally, we extend this to long long as well. Note that
8398 this does not include wchar_t. */
8399 || (bitfield && !flag_signed_bitfields
8401 /* A typedef for plain `int' without `signed' can be
8402 controlled just like plain `int', but a typedef for
8403 `signed int' cannot be so controlled. */
8405 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8406 && TREE_CODE (type) == INTEGER_TYPE
8407 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8409 if (explicit_int128)
8410 type = int128_unsigned_type_node;
8412 type = long_long_unsigned_type_node;
8414 type = long_unsigned_type_node;
8416 type = short_unsigned_type_node;
8417 else if (type == char_type_node)
8418 type = unsigned_char_type_node;
8419 else if (typedef_decl)
8420 type = unsigned_type_for (type);
8422 type = unsigned_type_node;
8424 else if (signed_p && type == char_type_node)
8425 type = signed_char_type_node;
8426 else if (explicit_int128)
8427 type = int128_integer_type_node;
8429 type = long_long_integer_type_node;
8431 type = long_integer_type_node;
8433 type = short_integer_type_node;
8435 if (declspecs->specs[(int)ds_complex])
8437 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8438 error ("complex invalid for %qs", name);
8439 /* If we just have "complex", it is equivalent to
8440 "complex double", but if any modifiers at all are specified it is
8441 the complex form of TYPE. E.g, "complex short" is
8442 "complex short int". */
8443 else if (defaulted_int && ! longlong && ! explicit_int128
8444 && ! (long_p || short_p || signed_p || unsigned_p))
8445 type = complex_double_type_node;
8446 else if (type == integer_type_node)
8447 type = complex_integer_type_node;
8448 else if (type == float_type_node)
8449 type = complex_float_type_node;
8450 else if (type == double_type_node)
8451 type = complex_double_type_node;
8452 else if (type == long_double_type_node)
8453 type = complex_long_double_type_node;
8455 type = build_complex_type (type);
8458 type_quals = TYPE_UNQUALIFIED;
8459 if (declspecs->specs[(int)ds_const])
8460 type_quals |= TYPE_QUAL_CONST;
8461 if (declspecs->specs[(int)ds_volatile])
8462 type_quals |= TYPE_QUAL_VOLATILE;
8463 if (declspecs->specs[(int)ds_restrict])
8464 type_quals |= TYPE_QUAL_RESTRICT;
8465 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8466 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8469 type_quals |= cp_type_quals (type);
8470 type = cp_build_qualified_type_real
8471 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8472 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8473 /* We might have ignored or rejected some of the qualifiers. */
8474 type_quals = cp_type_quals (type);
8477 inlinep = !! declspecs->specs[(int)ds_inline];
8478 virtualp = !! declspecs->specs[(int)ds_virtual];
8479 explicitp = !! declspecs->specs[(int)ds_explicit];
8481 storage_class = declspecs->storage_class;
8482 if (storage_class == sc_static)
8483 staticp = 1 + (decl_context == FIELD);
8485 if (virtualp && staticp == 2)
8487 error ("member %qD cannot be declared both virtual and static", dname);
8488 storage_class = sc_none;
8491 friendp = !! declspecs->specs[(int)ds_friend];
8493 if (dependent_name && !friendp)
8495 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8496 return error_mark_node;
8499 /* Issue errors about use of storage classes for parameters. */
8500 if (decl_context == PARM)
8502 if (declspecs->specs[(int)ds_typedef])
8504 error ("typedef declaration invalid in parameter declaration");
8505 return error_mark_node;
8507 else if (template_parm_flag && storage_class != sc_none)
8509 error ("storage class specified for template parameter %qs", name);
8510 return error_mark_node;
8512 else if (storage_class == sc_static
8513 || storage_class == sc_extern
8515 error ("storage class specifiers invalid in parameter declarations");
8517 if (type_uses_auto (type))
8519 error ("parameter declared %<auto%>");
8520 type = error_mark_node;
8523 /* Function parameters cannot be constexpr. If we saw one, moan
8524 and pretend it wasn't there. */
8527 error ("a parameter cannot be declared %<constexpr%>");
8532 /* Give error if `virtual' is used outside of class declaration. */
8534 && (current_class_name == NULL_TREE || decl_context != FIELD))
8536 error ("%<virtual%> outside class declaration");
8540 /* Static anonymous unions are dealt with here. */
8541 if (staticp && decl_context == TYPENAME
8543 && ANON_AGGR_TYPE_P (declspecs->type))
8544 decl_context = FIELD;
8546 /* Warn about storage classes that are invalid for certain
8547 kinds of declarations (parameters, typenames, etc.). */
8550 && storage_class != sc_extern
8551 && storage_class != sc_static)
8552 || declspecs->specs[(int)ds_typedef]))
8554 error ("multiple storage classes in declaration of %qs", name);
8557 if (decl_context != NORMAL
8558 && ((storage_class != sc_none
8559 && storage_class != sc_mutable)
8562 if ((decl_context == PARM || decl_context == CATCHPARM)
8563 && (storage_class == sc_register
8564 || storage_class == sc_auto))
8566 else if (declspecs->specs[(int)ds_typedef])
8568 else if (decl_context == FIELD
8569 /* C++ allows static class elements. */
8570 && storage_class == sc_static)
8571 /* C++ also allows inlines and signed and unsigned elements,
8572 but in those cases we don't come in here. */
8576 if (decl_context == FIELD)
8577 error ("storage class specified for %qs", name);
8580 if (decl_context == PARM || decl_context == CATCHPARM)
8581 error ("storage class specified for parameter %qs", name);
8583 error ("storage class specified for typename");
8585 if (storage_class == sc_register
8586 || storage_class == sc_auto
8587 || storage_class == sc_extern
8589 storage_class = sc_none;
8592 else if (storage_class == sc_extern && funcdef_flag
8593 && ! toplevel_bindings_p ())
8594 error ("nested function %qs declared %<extern%>", name);
8595 else if (toplevel_bindings_p ())
8597 if (storage_class == sc_auto)
8598 error ("top-level declaration of %qs specifies %<auto%>", name);
8601 && storage_class != sc_extern
8602 && storage_class != sc_static)
8604 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8609 if (storage_class && friendp)
8611 error ("storage class specifiers invalid in friend function declarations");
8612 storage_class = sc_none;
8617 unqualified_id = NULL_TREE;
8620 unqualified_id = id_declarator->u.id.unqualified_name;
8621 switch (TREE_CODE (unqualified_id))
8624 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8625 if (TYPE_P (unqualified_id))
8626 unqualified_id = constructor_name (unqualified_id);
8629 case IDENTIFIER_NODE:
8630 case TEMPLATE_ID_EXPR:
8638 /* Determine the type of the entity declared by recurring on the
8640 for (; declarator; declarator = declarator->declarator)
8642 const cp_declarator *inner_declarator;
8645 if (type == error_mark_node)
8646 return error_mark_node;
8648 attrs = declarator->attributes;
8654 if (declarator == NULL || declarator->kind == cdk_id)
8655 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8656 if (declarator->kind == cdk_function)
8657 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8658 if (declarator->kind == cdk_array)
8659 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8660 returned_attrs = decl_attributes (&type,
8661 chainon (returned_attrs, attrs),
8665 if (declarator->kind == cdk_id)
8668 inner_declarator = declarator->declarator;
8670 switch (declarator->kind)
8673 type = create_array_type_for_decl (dname, type,
8674 declarator->u.array.bounds);
8682 /* Declaring a function type.
8683 Make sure we have a valid type for the function to return. */
8685 if (type_quals != TYPE_UNQUALIFIED)
8687 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8688 warning (OPT_Wignored_qualifiers,
8689 "type qualifiers ignored on function return type");
8690 /* We now know that the TYPE_QUALS don't apply to the
8691 decl, but to its return type. */
8692 type_quals = TYPE_UNQUALIFIED;
8694 errmsg = targetm.invalid_return_type (type);
8698 type = integer_type_node;
8701 /* Error about some types functions can't return. */
8703 if (TREE_CODE (type) == FUNCTION_TYPE)
8705 error ("%qs declared as function returning a function", name);
8706 return error_mark_node;
8708 if (TREE_CODE (type) == ARRAY_TYPE)
8710 error ("%qs declared as function returning an array", name);
8711 return error_mark_node;
8714 /* Pick up type qualifiers which should be applied to `this'. */
8715 memfn_quals = declarator->u.function.qualifiers;
8717 /* Pick up the exception specifications. */
8718 raises = declarator->u.function.exception_specification;
8720 /* Say it's a definition only for the CALL_EXPR
8721 closest to the identifier. */
8722 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8724 /* Handle a late-specified return type. */
8727 if (type_uses_auto (type))
8729 if (!declarator->u.function.late_return_type)
8731 error ("%qs function uses %<auto%> type specifier without"
8732 " late return type", name);
8733 return error_mark_node;
8735 else if (!is_auto (type))
8737 error ("%qs function with late return type has"
8738 " %qT as its type rather than plain %<auto%>",
8740 return error_mark_node;
8743 else if (declarator->u.function.late_return_type)
8745 error ("%qs function with late return type not declared"
8746 " with %<auto%> type specifier", name);
8747 return error_mark_node;
8750 type = splice_late_return_type
8751 (type, declarator->u.function.late_return_type);
8752 if (type == error_mark_node)
8753 return error_mark_node;
8755 if (ctype == NULL_TREE
8756 && decl_context == FIELD
8758 && (friendp == 0 || dname == current_class_name))
8759 ctype = current_class_type;
8761 if (ctype && (sfk == sfk_constructor
8762 || sfk == sfk_destructor))
8764 /* We are within a class's scope. If our declarator name
8765 is the same as the class name, and we are defining
8766 a function, then it is a constructor/destructor, and
8767 therefore returns a void type. */
8769 /* ISO C++ 12.4/2. A destructor may not be declared
8770 const or volatile. A destructor may not be
8773 ISO C++ 12.1. A constructor may not be declared
8774 const or volatile. A constructor may not be
8775 virtual. A constructor may not be static. */
8777 error ((flags == DTOR_FLAG)
8778 ? "destructor cannot be static member function"
8779 : "constructor cannot be static member function");
8782 error ((flags == DTOR_FLAG)
8783 ? "destructors may not be cv-qualified"
8784 : "constructors may not be cv-qualified");
8785 memfn_quals = TYPE_UNQUALIFIED;
8788 if (decl_context == FIELD
8789 && !member_function_or_else (ctype,
8792 return error_mark_node;
8794 if (flags != DTOR_FLAG)
8796 /* It's a constructor. */
8801 permerror (input_location, "constructors cannot be declared virtual");
8804 if (decl_context == FIELD
8805 && sfk != sfk_constructor)
8806 return error_mark_node;
8808 if (decl_context == FIELD)
8814 error ("can%'t initialize friend function %qs", name);
8817 /* Cannot be both friend and virtual. */
8818 error ("virtual functions cannot be friends");
8821 if (decl_context == NORMAL)
8822 error ("friend declaration not in class definition");
8823 if (current_function_decl && funcdef_flag)
8824 error ("can%'t define friend function %qs in a local "
8828 else if (ctype && sfk == sfk_conversion)
8832 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8837 arg_types = grokparms (declarator->u.function.parameters,
8840 if (inner_declarator
8841 && inner_declarator->kind == cdk_id
8842 && inner_declarator->u.id.sfk == sfk_destructor
8843 && arg_types != void_list_node)
8845 error ("destructors may not have parameters");
8846 arg_types = void_list_node;
8850 type = build_function_type (type, arg_types);
8857 /* Filter out pointers-to-references and references-to-references.
8858 We can get these if a TYPE_DECL is used. */
8860 if (TREE_CODE (type) == REFERENCE_TYPE)
8862 if (declarator->kind != cdk_reference)
8864 error ("cannot declare pointer to %q#T", type);
8865 type = TREE_TYPE (type);
8868 /* In C++0x, we allow reference to reference declarations
8869 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8870 and template type arguments [14.3.1/4 temp.arg.type]. The
8871 check for direct reference to reference declarations, which
8872 are still forbidden, occurs below. Reasoning behind the change
8873 can be found in DR106, DR540, and the rvalue reference
8875 else if (cxx_dialect == cxx98)
8877 error ("cannot declare reference to %q#T", type);
8878 type = TREE_TYPE (type);
8881 else if (VOID_TYPE_P (type))
8883 if (declarator->kind == cdk_reference)
8884 error ("cannot declare reference to %q#T", type);
8885 else if (declarator->kind == cdk_ptrmem)
8886 error ("cannot declare pointer to %q#T member", type);
8889 /* We now know that the TYPE_QUALS don't apply to the decl,
8890 but to the target of the pointer. */
8891 type_quals = TYPE_UNQUALIFIED;
8893 if (declarator->kind == cdk_ptrmem
8894 && (TREE_CODE (type) == FUNCTION_TYPE
8895 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8897 memfn_quals |= type_memfn_quals (type);
8898 type = build_memfn_type (type,
8899 declarator->u.pointer.class_type,
8901 if (type == error_mark_node)
8902 return error_mark_node;
8903 memfn_quals = TYPE_UNQUALIFIED;
8906 if (TREE_CODE (type) == FUNCTION_TYPE
8907 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8908 error (declarator->kind == cdk_reference
8909 ? G_("cannot declare reference to qualified function type %qT")
8910 : G_("cannot declare pointer to qualified function type %qT"),
8913 /* When the pointed-to type involves components of variable size,
8914 care must be taken to ensure that the size evaluation code is
8915 emitted early enough to dominate all the possible later uses
8916 and late enough for the variables on which it depends to have
8919 This is expected to happen automatically when the pointed-to
8920 type has a name/declaration of it's own, but special attention
8921 is required if the type is anonymous.
8923 We handle the NORMAL and FIELD contexts here by inserting a
8924 dummy statement that just evaluates the size at a safe point
8925 and ensures it is not deferred until e.g. within a deeper
8926 conditional context (c++/43555).
8928 We expect nothing to be needed here for PARM or TYPENAME.
8929 Evaluating the size at this point for TYPENAME would
8930 actually be incorrect, as we might be in the middle of an
8931 expression with side effects on the pointed-to type size
8932 "arguments" prior to the pointer declaration point and the
8933 size evaluation could end up prior to the side effects. */
8935 if (!TYPE_NAME (type)
8936 && (decl_context == NORMAL || decl_context == FIELD)
8937 && at_function_scope_p ()
8938 && variably_modified_type_p (type, NULL_TREE))
8939 finish_expr_stmt (TYPE_SIZE (type));
8941 if (declarator->kind == cdk_reference)
8943 /* In C++0x, the type we are creating a reference to might be
8944 a typedef which is itself a reference type. In that case,
8945 we follow the reference collapsing rules in
8946 [7.1.3/8 dcl.typedef] to create the final reference type:
8948 "If a typedef TD names a type that is a reference to a type
8949 T, an attempt to create the type 'lvalue reference to cv TD'
8950 creates the type 'lvalue reference to T,' while an attempt
8951 to create the type "rvalue reference to cv TD' creates the
8954 if (!VOID_TYPE_P (type))
8955 type = cp_build_reference_type
8956 ((TREE_CODE (type) == REFERENCE_TYPE
8957 ? TREE_TYPE (type) : type),
8958 (declarator->u.reference.rvalue_ref
8959 && (TREE_CODE(type) != REFERENCE_TYPE
8960 || TYPE_REF_IS_RVALUE (type))));
8962 /* In C++0x, we need this check for direct reference to
8963 reference declarations, which are forbidden by
8964 [8.3.2/5 dcl.ref]. Reference to reference declarations
8965 are only allowed indirectly through typedefs and template
8966 type arguments. Example:
8968 void foo(int & &); // invalid ref-to-ref decl
8970 typedef int & int_ref;
8971 void foo(int_ref &); // valid ref-to-ref decl
8973 if (inner_declarator && inner_declarator->kind == cdk_reference)
8974 error ("cannot declare reference to %q#T, which is not "
8975 "a typedef or a template type argument", type);
8977 else if (TREE_CODE (type) == METHOD_TYPE)
8978 type = build_ptrmemfunc_type (build_pointer_type (type));
8979 else if (declarator->kind == cdk_ptrmem)
8981 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8983 if (declarator->u.pointer.class_type == error_mark_node)
8984 /* We will already have complained. */
8985 type = error_mark_node;
8987 type = build_ptrmem_type (declarator->u.pointer.class_type,
8991 type = build_pointer_type (type);
8993 /* Process a list of type modifier keywords (such as
8994 const or volatile) that were given inside the `*' or `&'. */
8996 if (declarator->u.pointer.qualifiers)
8999 = cp_build_qualified_type (type,
9000 declarator->u.pointer.qualifiers);
9001 type_quals = cp_type_quals (type);
9014 /* A `constexpr' specifier used in an object declaration declares
9015 the object as `const'. */
9016 if (constexpr_p && innermost_code != cdk_function)
9018 if (type_quals & TYPE_QUAL_CONST)
9019 error ("both %<const%> and %<constexpr%> cannot be used here");
9020 if (type_quals & TYPE_QUAL_VOLATILE)
9021 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9022 type_quals |= TYPE_QUAL_CONST;
9023 type = cp_build_qualified_type (type, type_quals);
9026 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9027 && TREE_CODE (type) != FUNCTION_TYPE
9028 && TREE_CODE (type) != METHOD_TYPE)
9030 error ("template-id %qD used as a declarator",
9032 unqualified_id = dname;
9035 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9036 qualified with a class-name, turn it into a METHOD_TYPE, unless
9037 we know that the function is static. We take advantage of this
9038 opportunity to do other processing that pertains to entities
9039 explicitly declared to be class members. Note that if DECLARATOR
9040 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9041 would not have exited the loop above. */
9043 && declarator->u.id.qualifying_scope
9044 && TYPE_P (declarator->u.id.qualifying_scope))
9048 ctype = declarator->u.id.qualifying_scope;
9049 ctype = TYPE_MAIN_VARIANT (ctype);
9051 while (t != NULL_TREE && CLASS_TYPE_P (t))
9053 /* You're supposed to have one `template <...>' for every
9054 template class, but you don't need one for a full
9055 specialization. For example:
9057 template <class T> struct S{};
9058 template <> struct S<int> { void f(); };
9059 void S<int>::f () {}
9061 is correct; there shouldn't be a `template <>' for the
9062 definition of `S<int>::f'. */
9063 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9064 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9065 /* T is an explicit (not partial) specialization. All
9066 containing classes must therefore also be explicitly
9069 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9070 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9071 template_count += 1;
9073 t = TYPE_MAIN_DECL (t);
9074 t = DECL_CONTEXT (t);
9077 if (ctype == current_class_type)
9081 permerror (input_location, "member functions are implicitly friends of their class");
9085 permerror (declarator->id_loc,
9086 "extra qualification %<%T::%> on member %qs",
9089 else if (/* If the qualifying type is already complete, then we
9090 can skip the following checks. */
9091 !COMPLETE_TYPE_P (ctype)
9092 && (/* If the function is being defined, then
9093 qualifying type must certainly be complete. */
9095 /* A friend declaration of "T::f" is OK, even if
9096 "T" is a template parameter. But, if this
9097 function is not a friend, the qualifying type
9099 || (!friendp && !CLASS_TYPE_P (ctype))
9100 /* For a declaration, the type need not be
9101 complete, if either it is dependent (since there
9102 is no meaningful definition of complete in that
9103 case) or the qualifying class is currently being
9105 || !(dependent_type_p (ctype)
9106 || currently_open_class (ctype)))
9107 /* Check that the qualifying type is complete. */
9108 && !complete_type_or_else (ctype, NULL_TREE))
9109 return error_mark_node;
9110 else if (TREE_CODE (type) == FUNCTION_TYPE)
9112 if (current_class_type
9113 && (!friendp || funcdef_flag))
9116 ? "cannot define member function %<%T::%s%> within %<%T%>"
9117 : "cannot declare member function %<%T::%s%> within %<%T%>",
9118 ctype, name, current_class_type);
9119 return error_mark_node;
9122 else if (declspecs->specs[(int)ds_typedef]
9123 && current_class_type)
9125 error ("cannot declare member %<%T::%s%> within %qT",
9126 ctype, name, current_class_type);
9127 return error_mark_node;
9131 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9132 ctype = current_class_type;
9134 /* A constexpr non-static member function is implicitly const. */
9135 if (constexpr_p && ctype && staticp == 0
9136 && TREE_CODE (type) == FUNCTION_TYPE
9137 && sfk != sfk_constructor && sfk != sfk_destructor)
9138 memfn_quals |= TYPE_QUAL_CONST;
9140 /* Now TYPE has the actual type. */
9145 *attrlist = chainon (returned_attrs, *attrlist);
9147 attrlist = &returned_attrs;
9150 /* Handle parameter packs. */
9151 if (parameter_pack_p)
9153 if (decl_context == PARM)
9154 /* Turn the type into a pack expansion.*/
9155 type = make_pack_expansion (type);
9157 error ("non-parameter %qs cannot be a parameter pack", name);
9160 /* Did array size calculations overflow? */
9162 if (TREE_CODE (type) == ARRAY_TYPE
9163 && COMPLETE_TYPE_P (type)
9164 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9165 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9167 error ("size of array %qs is too large", name);
9168 /* If we proceed with the array type as it is, we'll eventually
9169 crash in tree_low_cst(). */
9170 type = error_mark_node;
9173 if ((decl_context == FIELD || decl_context == PARM)
9174 && !processing_template_decl
9175 && variably_modified_type_p (type, NULL_TREE))
9177 if (decl_context == FIELD)
9178 error ("data member may not have variably modified type %qT", type);
9180 error ("parameter may not have variably modified type %qT", type);
9181 type = error_mark_node;
9184 if (explicitp == 1 || (explicitp && friendp))
9186 /* [dcl.fct.spec] The explicit specifier shall only be used in
9187 declarations of constructors within a class definition. */
9188 error ("only declarations of constructors can be %<explicit%>");
9192 if (storage_class == sc_mutable)
9194 if (decl_context != FIELD || friendp)
9196 error ("non-member %qs cannot be declared %<mutable%>", name);
9197 storage_class = sc_none;
9199 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9201 error ("non-object member %qs cannot be declared %<mutable%>", name);
9202 storage_class = sc_none;
9204 else if (TREE_CODE (type) == FUNCTION_TYPE
9205 || TREE_CODE (type) == METHOD_TYPE)
9207 error ("function %qs cannot be declared %<mutable%>", name);
9208 storage_class = sc_none;
9212 error ("static %qs cannot be declared %<mutable%>", name);
9213 storage_class = sc_none;
9215 else if (type_quals & TYPE_QUAL_CONST)
9217 error ("const %qs cannot be declared %<mutable%>", name);
9218 storage_class = sc_none;
9220 else if (TREE_CODE (type) == REFERENCE_TYPE)
9222 permerror (input_location, "reference %qs cannot be declared "
9223 "%<mutable%>", name);
9224 storage_class = sc_none;
9228 /* If this is declaring a typedef name, return a TYPE_DECL. */
9229 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9233 /* Note that the grammar rejects storage classes
9234 in typenames, fields or parameters. */
9235 if (current_lang_name == lang_name_java)
9236 TYPE_FOR_JAVA (type) = 1;
9238 /* This declaration:
9240 typedef void f(int) const;
9242 declares a function type which is not a member of any
9243 particular class, but which is cv-qualified; for
9244 example "f S::*" declares a pointer to a const-qualified
9245 member function of S. We record the cv-qualification in the
9247 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9249 type = apply_memfn_quals (type, memfn_quals);
9251 /* We have now dealt with these qualifiers. */
9252 memfn_quals = TYPE_UNQUALIFIED;
9255 if (decl_context == FIELD)
9256 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9258 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9259 if (id_declarator && declarator->u.id.qualifying_scope) {
9260 error_at (DECL_SOURCE_LOCATION (decl),
9261 "typedef name may not be a nested-name-specifier");
9262 TREE_TYPE (decl) = error_mark_node;
9265 if (decl_context != FIELD)
9267 if (!current_function_decl)
9268 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9269 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9270 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9271 (current_function_decl)))
9272 /* The TYPE_DECL is "abstract" because there will be
9273 clones of this constructor/destructor, and there will
9274 be copies of this TYPE_DECL generated in those
9276 DECL_ABSTRACT (decl) = 1;
9278 else if (constructor_name_p (unqualified_id, current_class_type))
9279 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9280 "as enclosing class",
9283 /* If the user declares "typedef struct {...} foo" then the
9284 struct will have an anonymous name. Fill that name in now.
9285 Nothing can refer to it, so nothing needs know about the name
9287 if (type != error_mark_node
9290 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9291 && TYPE_ANONYMOUS_P (type)
9292 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9296 /* Replace the anonymous name with the real name everywhere. */
9297 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9299 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9300 /* We do not rename the debug info representing the
9301 anonymous tagged type because the standard says in
9302 [dcl.typedef] that the naming applies only for
9303 linkage purposes. */
9304 /*debug_hooks->set_name (t, decl);*/
9305 TYPE_NAME (t) = decl;
9308 if (TYPE_LANG_SPECIFIC (type))
9309 TYPE_WAS_ANONYMOUS (type) = 1;
9311 /* If this is a typedef within a template class, the nested
9312 type is a (non-primary) template. The name for the
9313 template needs updating as well. */
9314 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9315 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9316 = TYPE_IDENTIFIER (type);
9318 /* Adjust linkage now that we aren't anonymous anymore. */
9319 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9320 determine_visibility (TYPE_MAIN_DECL (type));
9322 /* FIXME remangle member functions; member functions of a
9323 type with external linkage have external linkage. */
9327 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9328 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9330 bad_specifiers (decl, BSP_TYPE, virtualp,
9331 memfn_quals != TYPE_UNQUALIFIED,
9332 inlinep, friendp, raises != NULL_TREE);
9337 /* Detect the case of an array type of unspecified size
9338 which came, as such, direct from a typedef name.
9339 We must copy the type, so that the array's domain can be
9340 individually set by the object's initializer. */
9342 if (type && typedef_type
9343 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9344 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9345 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9347 /* Detect where we're using a typedef of function type to declare a
9348 function. PARMS will not be set, so we must create it now. */
9350 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9352 tree decls = NULL_TREE;
9355 for (args = TYPE_ARG_TYPES (type);
9356 args && args != void_list_node;
9357 args = TREE_CHAIN (args))
9359 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9361 DECL_CHAIN (decl) = decls;
9365 parms = nreverse (decls);
9367 if (decl_context != TYPENAME)
9369 /* A cv-qualifier-seq shall only be part of the function type
9370 for a non-static member function. [8.3.5/4 dcl.fct] */
9371 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9372 && (current_class_type == NULL_TREE || staticp) )
9375 ? G_("qualified function types cannot be used to "
9376 "declare static member functions")
9377 : G_("qualified function types cannot be used to "
9378 "declare free functions"));
9379 type = TYPE_MAIN_VARIANT (type);
9382 /* The qualifiers on the function type become the qualifiers on
9383 the non-static member function. */
9384 memfn_quals |= type_memfn_quals (type);
9385 type_quals = TYPE_UNQUALIFIED;
9389 /* If this is a type name (such as, in a cast or sizeof),
9390 compute the type and return it now. */
9392 if (decl_context == TYPENAME)
9394 /* Note that the grammar rejects storage classes
9395 in typenames, fields or parameters. */
9396 if (type_quals != TYPE_UNQUALIFIED)
9397 type_quals = TYPE_UNQUALIFIED;
9399 /* Special case: "friend class foo" looks like a TYPENAME context. */
9402 if (type_quals != TYPE_UNQUALIFIED)
9404 error ("type qualifiers specified for friend class declaration");
9405 type_quals = TYPE_UNQUALIFIED;
9409 error ("%<inline%> specified for friend class declaration");
9415 /* Don't allow friend declaration without a class-key. */
9416 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9417 permerror (input_location, "template parameters cannot be friends");
9418 else if (TREE_CODE (type) == TYPENAME_TYPE)
9419 permerror (input_location, "friend declaration requires class-key, "
9420 "i.e. %<friend class %T::%D%>",
9421 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9423 permerror (input_location, "friend declaration requires class-key, "
9424 "i.e. %<friend %#T%>",
9428 /* Only try to do this stuff if we didn't already give up. */
9429 if (type != integer_type_node)
9431 /* A friendly class? */
9432 if (current_class_type)
9433 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9436 error ("trying to make class %qT a friend of global scope",
9439 type = void_type_node;
9442 else if (memfn_quals)
9444 if (ctype == NULL_TREE
9445 && TREE_CODE (type) == METHOD_TYPE)
9446 ctype = TYPE_METHOD_BASETYPE (type);
9449 type = build_memfn_type (type, ctype, memfn_quals);
9450 /* Core issue #547: need to allow this in template type args. */
9451 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9452 type = apply_memfn_quals (type, memfn_quals);
9454 error ("invalid qualifiers on non-member function type");
9459 else if (unqualified_id == NULL_TREE && decl_context != PARM
9460 && decl_context != CATCHPARM
9461 && TREE_CODE (type) != UNION_TYPE
9464 error ("abstract declarator %qT used as declaration", type);
9465 return error_mark_node;
9468 /* Only functions may be declared using an operator-function-id. */
9470 && IDENTIFIER_OPNAME_P (unqualified_id)
9471 && TREE_CODE (type) != FUNCTION_TYPE
9472 && TREE_CODE (type) != METHOD_TYPE)
9474 error ("declaration of %qD as non-function", unqualified_id);
9475 return error_mark_node;
9478 /* We don't check parameter types here because we can emit a better
9479 error message later. */
9480 if (decl_context != PARM)
9482 type = check_var_type (unqualified_id, type);
9483 if (type == error_mark_node)
9484 return error_mark_node;
9487 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9488 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9490 if (decl_context == PARM || decl_context == CATCHPARM)
9492 if (ctype || in_namespace)
9493 error ("cannot use %<::%> in parameter declaration");
9495 /* A parameter declared as an array of T is really a pointer to T.
9496 One declared as a function is really a pointer to a function.
9497 One declared as a member is really a pointer to member. */
9499 if (TREE_CODE (type) == ARRAY_TYPE)
9501 /* Transfer const-ness of array into that of type pointed to. */
9502 type = build_pointer_type (TREE_TYPE (type));
9503 type_quals = TYPE_UNQUALIFIED;
9505 else if (TREE_CODE (type) == FUNCTION_TYPE)
9506 type = build_pointer_type (type);
9509 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9510 && !NEW_DELETE_OPNAME_P (unqualified_id))
9511 type = build_memfn_type (type, ctype, memfn_quals);
9516 if (decl_context == PARM)
9518 decl = cp_build_parm_decl (unqualified_id, type);
9520 bad_specifiers (decl, BSP_PARM, virtualp,
9521 memfn_quals != TYPE_UNQUALIFIED,
9522 inlinep, friendp, raises != NULL_TREE);
9524 else if (decl_context == FIELD)
9526 /* The C99 flexible array extension. */
9527 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9528 && TYPE_DOMAIN (type) == NULL_TREE)
9530 tree itype = compute_array_index_type (dname, integer_zero_node,
9531 tf_warning_or_error);
9532 type = build_cplus_array_type (TREE_TYPE (type), itype);
9535 if (type == error_mark_node)
9537 /* Happens when declaring arrays of sizes which
9538 are error_mark_node, for example. */
9541 else if (in_namespace && !friendp)
9543 /* Something like struct S { int N::j; }; */
9544 error ("invalid use of %<::%>");
9545 return error_mark_node;
9547 else if (TREE_CODE (type) == FUNCTION_TYPE
9548 || TREE_CODE (type) == METHOD_TYPE)
9551 tree function_context;
9555 /* This should never happen in pure C++ (the check
9556 could be an assert). It could happen in
9557 Objective-C++ if someone writes invalid code that
9558 uses a function declaration for an instance
9559 variable or property (instance variables and
9560 properties are parsed as FIELD_DECLs, but they are
9561 part of an Objective-C class, not a C++ class).
9562 That code is invalid and is caught by this
9566 error ("declaration of function %qD in invalid context",
9568 return error_mark_node;
9571 /* ``A union may [ ... ] not [ have ] virtual functions.''
9573 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9575 error ("function %qD declared virtual inside a union",
9577 return error_mark_node;
9580 if (NEW_DELETE_OPNAME_P (unqualified_id))
9584 error ("%qD cannot be declared virtual, since it "
9592 /* Check that the name used for a destructor makes sense. */
9593 if (sfk == sfk_destructor)
9595 tree uqname = id_declarator->u.id.unqualified_name;
9599 gcc_assert (friendp);
9600 error ("expected qualified name in friend declaration "
9601 "for destructor %qD", uqname);
9602 return error_mark_node;
9605 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9607 error ("declaration of %qD as member of %qT",
9609 return error_mark_node;
9613 error ("a destructor cannot be %<constexpr%>");
9614 return error_mark_node;
9617 else if (sfk == sfk_constructor && friendp && !ctype)
9619 error ("expected qualified name in friend declaration "
9620 "for constructor %qD",
9621 id_declarator->u.id.unqualified_name);
9622 return error_mark_node;
9625 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9626 function_context = (ctype != NULL_TREE) ?
9627 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9628 publicp = (! friendp || ! staticp)
9629 && function_context == NULL_TREE;
9630 decl = grokfndecl (ctype, type,
9631 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9632 ? unqualified_id : dname,
9635 virtualp, flags, memfn_quals, raises,
9636 friendp ? -1 : 0, friendp, publicp,
9637 inlinep | (2 * constexpr_p),
9639 funcdef_flag, template_count, in_namespace,
9640 attrlist, declarator->id_loc);
9641 if (decl == NULL_TREE)
9642 return error_mark_node;
9644 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9645 /* The decl and setting of decl_attr is also turned off. */
9646 decl = build_decl_attribute_variant (decl, decl_attr);
9649 /* [class.conv.ctor]
9651 A constructor declared without the function-specifier
9652 explicit that can be called with a single parameter
9653 specifies a conversion from the type of its first
9654 parameter to the type of its class. Such a constructor
9655 is called a converting constructor. */
9657 DECL_NONCONVERTING_P (decl) = 1;
9659 else if (!staticp && !dependent_type_p (type)
9660 && !COMPLETE_TYPE_P (complete_type (type))
9661 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9664 error ("field %qD has incomplete type", unqualified_id);
9666 error ("name %qT has incomplete type", type);
9668 /* If we're instantiating a template, tell them which
9669 instantiation made the field's type be incomplete. */
9670 if (current_class_type
9671 && TYPE_NAME (current_class_type)
9672 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9674 && declspecs->type == type)
9675 error (" in instantiation of template %qT",
9676 current_class_type);
9678 return error_mark_node;
9684 error ("%qE is neither function nor member function; "
9685 "cannot be declared friend", unqualified_id);
9693 /* Friends are treated specially. */
9694 if (ctype == current_class_type)
9695 ; /* We already issued a permerror. */
9696 else if (decl && DECL_NAME (decl))
9698 if (template_class_depth (current_class_type) == 0)
9700 decl = check_explicit_specialization
9701 (unqualified_id, decl, template_count,
9702 2 * funcdef_flag + 4);
9703 if (decl == error_mark_node)
9704 return error_mark_node;
9707 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9708 decl = do_friend (ctype, unqualified_id, decl,
9714 return error_mark_node;
9717 /* Structure field. It may not be a function, except for C++. */
9719 if (decl == NULL_TREE)
9725 /* An attempt is being made to initialize a non-static
9726 member. But, from [class.mem]:
9728 4 A member-declarator can contain a
9729 constant-initializer only if it declares a static
9730 member (_class.static_) of integral or enumeration
9731 type, see _class.static.data_.
9733 This used to be relatively common practice, but
9734 the rest of the compiler does not correctly
9735 handle the initialization unless the member is
9736 static so we make it static below. */
9737 if (cxx_dialect >= cxx0x)
9739 sorry ("non-static data member initializers");
9743 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9745 permerror (input_location, "making %qD static", unqualified_id);
9750 if (uses_template_parms (type))
9751 /* We'll check at instantiation time. */
9753 else if (constexpr_p)
9754 /* constexpr has the same requirements. */
9756 else if (check_static_variable_definition (unqualified_id,
9758 /* If we just return the declaration, crashes
9759 will sometimes occur. We therefore return
9760 void_type_node, as if this was a friend
9761 declaration, to cause callers to completely
9762 ignore this declaration. */
9763 return error_mark_node;
9768 /* C++ allows static class members. All other work
9769 for this is done by grokfield. */
9770 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9771 set_linkage_for_static_data_member (decl);
9772 /* Even if there is an in-class initialization, DECL
9773 is considered undefined until an out-of-class
9774 definition is provided. */
9775 DECL_EXTERNAL (decl) = 1;
9778 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9780 if (constexpr_p && !initialized)
9782 error ("constexpr static data member %qD must have an "
9783 "initializer", decl);
9784 constexpr_p = false;
9791 error ("non-static data member %qE declared %<constexpr%>",
9793 constexpr_p = false;
9795 decl = build_decl (input_location,
9796 FIELD_DECL, unqualified_id, type);
9797 DECL_NONADDRESSABLE_P (decl) = bitfield;
9798 if (bitfield && !unqualified_id)
9799 TREE_NO_WARNING (decl) = 1;
9801 if (storage_class == sc_mutable)
9803 DECL_MUTABLE_P (decl) = 1;
9804 storage_class = sc_none;
9808 bad_specifiers (decl, BSP_FIELD, virtualp,
9809 memfn_quals != TYPE_UNQUALIFIED,
9810 inlinep, friendp, raises != NULL_TREE);
9813 else if (TREE_CODE (type) == FUNCTION_TYPE
9814 || TREE_CODE (type) == METHOD_TYPE)
9819 if (!unqualified_id)
9820 return error_mark_node;
9822 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9823 original_name = dname;
9825 original_name = unqualified_id;
9827 if (storage_class == sc_auto)
9828 error ("storage class %<auto%> invalid for function %qs", name);
9829 else if (storage_class == sc_register)
9830 error ("storage class %<register%> invalid for function %qs", name);
9832 error ("storage class %<__thread%> invalid for function %qs", name);
9834 /* Function declaration not at top level.
9835 Storage classes other than `extern' are not allowed
9836 and `extern' makes no difference. */
9837 if (! toplevel_bindings_p ()
9838 && (storage_class == sc_static
9839 || declspecs->specs[(int)ds_inline])
9842 if (storage_class == sc_static)
9843 pedwarn (input_location, OPT_pedantic,
9844 "%<static%> specified invalid for function %qs "
9845 "declared out of global scope", name);
9847 pedwarn (input_location, OPT_pedantic,
9848 "%<inline%> specifier invalid for function %qs "
9849 "declared out of global scope", name);
9852 if (ctype != NULL_TREE
9853 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9855 error ("%q#T is not a class or a namespace", ctype);
9859 if (ctype == NULL_TREE)
9863 error ("virtual non-class function %qs", name);
9866 else if (sfk == sfk_constructor
9867 || sfk == sfk_destructor)
9870 ? "%qs defined in a non-class scope"
9871 : "%qs declared in a non-class scope", name);
9876 /* Record presence of `static'. */
9877 publicp = (ctype != NULL_TREE
9878 || storage_class == sc_extern
9879 || storage_class != sc_static);
9881 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9882 virtualp, flags, memfn_quals, raises,
9884 publicp, inlinep | (2 * constexpr_p), sfk,
9886 template_count, in_namespace, attrlist,
9887 declarator->id_loc);
9888 if (decl == NULL_TREE)
9889 return error_mark_node;
9893 int invalid_static = 0;
9895 /* Don't allow a static member function in a class, and forbid
9896 declaring main to be static. */
9897 if (TREE_CODE (type) == METHOD_TYPE)
9899 permerror (input_location, "cannot declare member function %qD to have "
9900 "static linkage", decl);
9903 else if (current_function_decl)
9905 /* FIXME need arm citation */
9906 error ("cannot declare static function inside another function");
9913 storage_class = sc_none;
9919 /* It's a variable. */
9921 /* An uninitialized decl with `extern' is a reference. */
9922 decl = grokvardecl (type, unqualified_id,
9925 (type_quals & TYPE_QUAL_CONST) != 0,
9926 ctype ? ctype : in_namespace);
9927 bad_specifiers (decl, BSP_VAR, virtualp,
9928 memfn_quals != TYPE_UNQUALIFIED,
9929 inlinep, friendp, raises != NULL_TREE);
9933 DECL_CONTEXT (decl) = ctype;
9936 permerror (input_location, "%<static%> may not be used when defining "
9937 "(as opposed to declaring) a static data member");
9939 storage_class = sc_none;
9941 if (storage_class == sc_register && TREE_STATIC (decl))
9943 error ("static member %qD declared %<register%>", decl);
9944 storage_class = sc_none;
9946 if (storage_class == sc_extern && pedantic)
9948 pedwarn (input_location, OPT_pedantic,
9949 "cannot explicitly declare member %q#D to have "
9950 "extern linkage", decl);
9951 storage_class = sc_none;
9954 else if (constexpr_p && DECL_EXTERNAL (decl))
9955 error ("declaration of constexpr variable %qD is not a definition",
9959 if (storage_class == sc_extern && initialized && !funcdef_flag)
9961 if (toplevel_bindings_p ())
9963 /* It's common practice (and completely valid) to have a const
9964 be initialized and declared extern. */
9965 if (!(type_quals & TYPE_QUAL_CONST))
9966 warning (0, "%qs initialized and declared %<extern%>", name);
9970 error ("%qs has both %<extern%> and initializer", name);
9971 return error_mark_node;
9975 /* Record `register' declaration for warnings on &
9976 and in case doing stupid register allocation. */
9978 if (storage_class == sc_register)
9979 DECL_REGISTER (decl) = 1;
9980 else if (storage_class == sc_extern)
9981 DECL_THIS_EXTERN (decl) = 1;
9982 else if (storage_class == sc_static)
9983 DECL_THIS_STATIC (decl) = 1;
9985 /* Don't forget constexprness. */
9987 DECL_DECLARED_CONSTEXPR_P (decl) = true;
9989 /* Record constancy and volatility on the DECL itself . There's
9990 no need to do this when processing a template; we'll do this
9991 for the instantiated declaration based on the type of DECL. */
9992 if (!processing_template_decl)
9993 cp_apply_type_quals_to_decl (type_quals, decl);
9999 /* Subroutine of start_function. Ensure that each of the parameter
10000 types (as listed in PARMS) is complete, as is required for a
10001 function definition. */
10004 require_complete_types_for_parms (tree parms)
10006 for (; parms; parms = DECL_CHAIN (parms))
10008 if (dependent_type_p (TREE_TYPE (parms)))
10010 if (!VOID_TYPE_P (TREE_TYPE (parms))
10011 && complete_type_or_else (TREE_TYPE (parms), parms))
10013 relayout_decl (parms);
10014 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10017 /* grokparms or complete_type_or_else will have already issued
10019 TREE_TYPE (parms) = error_mark_node;
10023 /* Returns nonzero if T is a local variable. */
10026 local_variable_p (const_tree t)
10028 if ((TREE_CODE (t) == VAR_DECL
10029 /* A VAR_DECL with a context that is a _TYPE is a static data
10031 && !TYPE_P (CP_DECL_CONTEXT (t))
10032 /* Any other non-local variable must be at namespace scope. */
10033 && !DECL_NAMESPACE_SCOPE_P (t))
10034 || (TREE_CODE (t) == PARM_DECL))
10040 /* Like local_variable_p, but suitable for use as a tree-walking
10044 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10045 void *data ATTRIBUTE_UNUSED)
10047 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10049 else if (TYPE_P (*tp))
10050 *walk_subtrees = 0;
10056 /* Check that ARG, which is a default-argument expression for a
10057 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10058 something goes wrong. DECL may also be a _TYPE node, rather than a
10059 DECL, if there is no DECL available. */
10062 check_default_argument (tree decl, tree arg)
10067 if (TREE_CODE (arg) == DEFAULT_ARG)
10068 /* We get a DEFAULT_ARG when looking at an in-class declaration
10069 with a default argument. Ignore the argument for now; we'll
10070 deal with it after the class is complete. */
10079 decl_type = TREE_TYPE (decl);
10081 if (arg == error_mark_node
10082 || decl == error_mark_node
10083 || TREE_TYPE (arg) == error_mark_node
10084 || decl_type == error_mark_node)
10085 /* Something already went wrong. There's no need to check
10087 return error_mark_node;
10089 /* [dcl.fct.default]
10091 A default argument expression is implicitly converted to the
10093 if (!TREE_TYPE (arg)
10094 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10097 error ("default argument for %q#D has type %qT",
10098 decl, TREE_TYPE (arg));
10100 error ("default argument for parameter of type %qT has type %qT",
10101 decl_type, TREE_TYPE (arg));
10103 return error_mark_node;
10106 /* [dcl.fct.default]
10108 Local variables shall not be used in default argument
10111 The keyword `this' shall not be used in a default argument of a
10112 member function. */
10113 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10116 error ("default argument %qE uses local variable %qD", arg, var);
10117 return error_mark_node;
10124 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10127 type_is_deprecated (tree type)
10129 enum tree_code code;
10130 if (TREE_DEPRECATED (type))
10132 if (TYPE_NAME (type)
10133 && TREE_DEPRECATED (TYPE_NAME (type)))
10136 /* Do warn about using typedefs to a deprecated class. */
10137 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10138 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10140 code = TREE_CODE (type);
10142 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10143 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10144 || code == METHOD_TYPE || code == ARRAY_TYPE)
10145 return type_is_deprecated (TREE_TYPE (type));
10147 if (TYPE_PTRMEMFUNC_P (type))
10148 return type_is_deprecated
10149 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10154 /* Decode the list of parameter types for a function type.
10155 Given the list of things declared inside the parens,
10156 return a list of types.
10158 If this parameter does not end with an ellipsis, we append
10161 *PARMS is set to the chain of PARM_DECLs created. */
10164 grokparms (tree parmlist, tree *parms)
10166 tree result = NULL_TREE;
10167 tree decls = NULL_TREE;
10171 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10173 tree type = NULL_TREE;
10174 tree init = TREE_PURPOSE (parm);
10175 tree decl = TREE_VALUE (parm);
10176 const char *errmsg;
10178 if (parm == void_list_node)
10181 if (! decl || TREE_TYPE (decl) == error_mark_node)
10184 type = TREE_TYPE (decl);
10185 if (VOID_TYPE_P (type))
10187 if (same_type_p (type, void_type_node)
10188 && DECL_SELF_REFERENCE_P (type)
10189 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10190 /* this is a parmlist of `(void)', which is ok. */
10192 cxx_incomplete_type_error (decl, type);
10193 /* It's not a good idea to actually create parameters of
10194 type `void'; other parts of the compiler assume that a
10195 void type terminates the parameter list. */
10196 type = error_mark_node;
10197 TREE_TYPE (decl) = error_mark_node;
10200 if (type != error_mark_node
10201 && TYPE_FOR_JAVA (type)
10202 && MAYBE_CLASS_TYPE_P (type))
10204 error ("parameter %qD has Java class type", decl);
10205 type = error_mark_node;
10206 TREE_TYPE (decl) = error_mark_node;
10210 if (type != error_mark_node
10211 && (errmsg = targetm.invalid_parameter_type (type)))
10214 type = error_mark_node;
10215 TREE_TYPE (decl) = error_mark_node;
10218 if (type != error_mark_node)
10220 if (deprecated_state != DEPRECATED_SUPPRESS)
10222 tree deptype = type_is_deprecated (type);
10224 warn_deprecated_use (deptype, NULL_TREE);
10227 /* Top-level qualifiers on the parameters are
10228 ignored for function types. */
10229 type = cp_build_qualified_type (type, 0);
10230 if (TREE_CODE (type) == METHOD_TYPE)
10232 error ("parameter %qD invalidly declared method type", decl);
10233 type = build_pointer_type (type);
10234 TREE_TYPE (decl) = type;
10236 else if (abstract_virtuals_error (decl, type))
10237 any_error = 1; /* Seems like a good idea. */
10238 else if (POINTER_TYPE_P (type))
10240 /* [dcl.fct]/6, parameter types cannot contain pointers
10241 (references) to arrays of unknown bound. */
10242 tree t = TREE_TYPE (type);
10243 int ptr = TYPE_PTR_P (type);
10247 if (TYPE_PTR_P (t))
10249 else if (TREE_CODE (t) != ARRAY_TYPE)
10251 else if (!TYPE_DOMAIN (t))
10255 if (TREE_CODE (t) == ARRAY_TYPE)
10257 ? G_("parameter %qD includes pointer to array of "
10258 "unknown bound %qT")
10259 : G_("parameter %qD includes reference to array of "
10260 "unknown bound %qT"),
10266 else if (init && !processing_template_decl)
10267 init = check_default_argument (decl, init);
10270 if (TREE_CODE (decl) == PARM_DECL
10271 && FUNCTION_PARAMETER_PACK_P (decl)
10272 && TREE_CHAIN (parm)
10273 && TREE_CHAIN (parm) != void_list_node)
10274 error ("parameter packs must be at the end of the parameter list");
10276 DECL_CHAIN (decl) = decls;
10278 result = tree_cons (init, type, result);
10280 decls = nreverse (decls);
10281 result = nreverse (result);
10283 result = chainon (result, void_list_node);
10290 /* D is a constructor or overloaded `operator='.
10292 Let T be the class in which D is declared. Then, this function
10295 -1 if D's is an ill-formed constructor or copy assignment operator
10296 whose first parameter is of type `T'.
10297 0 if D is not a copy constructor or copy assignment
10299 1 if D is a copy constructor or copy assignment operator whose
10300 first parameter is a reference to non-const qualified T.
10301 2 if D is a copy constructor or copy assignment operator whose
10302 first parameter is a reference to const qualified T.
10304 This function can be used as a predicate. Positive values indicate
10305 a copy constructor and nonzero values indicate a copy assignment
10309 copy_fn_p (const_tree d)
10315 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10317 if (TREE_CODE (d) == TEMPLATE_DECL
10318 || (DECL_TEMPLATE_INFO (d)
10319 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10320 /* Instantiations of template member functions are never copy
10321 functions. Note that member functions of templated classes are
10322 represented as template functions internally, and we must
10323 accept those as copy functions. */
10326 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10330 arg_type = TREE_VALUE (args);
10331 if (arg_type == error_mark_node)
10334 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10336 /* Pass by value copy assignment operator. */
10339 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10340 && !TYPE_REF_IS_RVALUE (arg_type)
10341 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10343 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10349 args = TREE_CHAIN (args);
10351 if (args && args != void_list_node && !TREE_PURPOSE (args))
10352 /* There are more non-optional args. */
10358 /* D is a constructor or overloaded `operator='.
10360 Let T be the class in which D is declared. Then, this function
10361 returns true when D is a move constructor or move assignment
10362 operator, false otherwise. */
10365 move_fn_p (const_tree d)
10369 bool result = false;
10371 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10373 if (cxx_dialect == cxx98)
10374 /* There are no move constructors if we are in C++98 mode. */
10377 if (TREE_CODE (d) == TEMPLATE_DECL
10378 || (DECL_TEMPLATE_INFO (d)
10379 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10380 /* Instantiations of template member functions are never copy
10381 functions. Note that member functions of templated classes are
10382 represented as template functions internally, and we must
10383 accept those as copy functions. */
10386 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10390 arg_type = TREE_VALUE (args);
10391 if (arg_type == error_mark_node)
10394 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10395 && TYPE_REF_IS_RVALUE (arg_type)
10396 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10400 args = TREE_CHAIN (args);
10402 if (args && args != void_list_node && !TREE_PURPOSE (args))
10403 /* There are more non-optional args. */
10409 /* Remember any special properties of member function DECL. */
10412 grok_special_member_properties (tree decl)
10416 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10419 class_type = DECL_CONTEXT (decl);
10420 if (DECL_CONSTRUCTOR_P (decl))
10422 int ctor = copy_fn_p (decl);
10424 if (!DECL_ARTIFICIAL (decl))
10425 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10431 A non-template constructor for class X is a copy
10432 constructor if its first parameter is of type X&, const
10433 X&, volatile X& or const volatile X&, and either there
10434 are no other parameters or else all other parameters have
10435 default arguments. */
10436 TYPE_HAS_COPY_CTOR (class_type) = 1;
10437 if (user_provided_p (decl))
10438 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10440 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10442 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10444 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10445 if (user_provided_p (decl))
10446 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10448 else if (move_fn_p (decl) && user_provided_p (decl))
10449 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10450 else if (is_list_ctor (decl))
10451 TYPE_HAS_LIST_CTOR (class_type) = 1;
10453 if (DECL_DECLARED_CONSTEXPR_P (decl)
10454 && !copy_fn_p (decl) && !move_fn_p (decl))
10455 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10457 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10461 A non-template assignment operator for class X is a copy
10462 assignment operator if its parameter is of type X, X&, const
10463 X&, volatile X& or const volatile X&. */
10465 int assop = copy_fn_p (decl);
10469 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10470 if (user_provided_p (decl))
10471 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10473 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10475 else if (move_fn_p (decl) && user_provided_p (decl))
10476 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10478 /* Destructors are handled in check_methods. */
10481 /* Check a constructor DECL has the correct form. Complains
10482 if the class has a constructor of the form X(X). */
10485 grok_ctor_properties (const_tree ctype, const_tree decl)
10487 int ctor_parm = copy_fn_p (decl);
10493 A declaration of a constructor for a class X is ill-formed if
10494 its first parameter is of type (optionally cv-qualified) X
10495 and either there are no other parameters or else all other
10496 parameters have default arguments.
10498 We *don't* complain about member template instantiations that
10499 have this form, though; they can occur as we try to decide
10500 what constructor to use during overload resolution. Since
10501 overload resolution will never prefer such a constructor to
10502 the non-template copy constructor (which is either explicitly
10503 or implicitly defined), there's no need to worry about their
10504 existence. Theoretically, they should never even be
10505 instantiated, but that's hard to forestall. */
10506 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10514 /* An operator with this code is unary, but can also be binary. */
10517 ambi_op_p (enum tree_code code)
10519 return (code == INDIRECT_REF
10520 || code == ADDR_EXPR
10521 || code == UNARY_PLUS_EXPR
10522 || code == NEGATE_EXPR
10523 || code == PREINCREMENT_EXPR
10524 || code == PREDECREMENT_EXPR);
10527 /* An operator with this name can only be unary. */
10530 unary_op_p (enum tree_code code)
10532 return (code == TRUTH_NOT_EXPR
10533 || code == BIT_NOT_EXPR
10534 || code == COMPONENT_REF
10535 || code == TYPE_EXPR);
10538 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10539 errors are issued for invalid declarations. */
10542 grok_op_properties (tree decl, bool complain)
10544 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10546 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10547 tree name = DECL_NAME (decl);
10548 enum tree_code operator_code;
10553 /* Count the number of arguments and check for ellipsis. */
10554 for (argtype = argtypes, arity = 0;
10555 argtype && argtype != void_list_node;
10556 argtype = TREE_CHAIN (argtype))
10558 ellipsis_p = !argtype;
10560 class_type = DECL_CONTEXT (decl);
10561 if (class_type && !CLASS_TYPE_P (class_type))
10562 class_type = NULL_TREE;
10564 if (DECL_CONV_FN_P (decl))
10565 operator_code = TYPE_EXPR;
10569 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10570 if (ansi_opname (CODE) == name) \
10572 operator_code = (CODE); \
10575 else if (ansi_assopname (CODE) == name) \
10577 operator_code = (CODE); \
10578 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10582 #include "operators.def"
10583 #undef DEF_OPERATOR
10585 gcc_unreachable ();
10588 gcc_assert (operator_code != MAX_TREE_CODES);
10589 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10592 switch (operator_code)
10595 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10599 TYPE_GETS_DELETE (class_type) |= 1;
10603 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10606 case VEC_DELETE_EXPR:
10607 TYPE_GETS_DELETE (class_type) |= 2;
10614 /* [basic.std.dynamic.allocation]/1:
10616 A program is ill-formed if an allocation function is declared
10617 in a namespace scope other than global scope or declared static
10620 The same also holds true for deallocation functions. */
10621 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10622 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10624 if (DECL_NAMESPACE_SCOPE_P (decl))
10626 if (CP_DECL_CONTEXT (decl) != global_namespace)
10628 error ("%qD may not be declared within a namespace", decl);
10631 else if (!TREE_PUBLIC (decl))
10633 error ("%qD may not be declared as static", decl);
10639 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10641 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10642 DECL_IS_OPERATOR_NEW (decl) = 1;
10644 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10645 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10648 /* An operator function must either be a non-static member function
10649 or have at least one parameter of a class, a reference to a class,
10650 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10651 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10653 if (operator_code == TYPE_EXPR
10654 || operator_code == CALL_EXPR
10655 || operator_code == COMPONENT_REF
10656 || operator_code == ARRAY_REF
10657 || operator_code == NOP_EXPR)
10659 error ("%qD must be a nonstatic member function", decl);
10666 if (DECL_STATIC_FUNCTION_P (decl))
10668 error ("%qD must be either a non-static member "
10669 "function or a non-member function", decl);
10673 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10675 tree arg = non_reference (TREE_VALUE (p));
10676 if (arg == error_mark_node)
10679 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10680 because these checks are performed even on
10681 template functions. */
10682 if (MAYBE_CLASS_TYPE_P (arg)
10683 || TREE_CODE (arg) == ENUMERAL_TYPE)
10687 if (!p || p == void_list_node)
10690 error ("%qD must have an argument of class or "
10691 "enumerated type", decl);
10697 /* There are no restrictions on the arguments to an overloaded
10699 if (operator_code == CALL_EXPR)
10702 /* Warn about conversion operators that will never be used. */
10703 if (IDENTIFIER_TYPENAME_P (name)
10704 && ! DECL_TEMPLATE_INFO (decl)
10706 /* Warn only declaring the function; there is no need to
10707 warn again about out-of-class definitions. */
10708 && class_type == current_class_type)
10710 tree t = TREE_TYPE (name);
10711 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10714 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10716 if (TREE_CODE (t) == VOID_TYPE)
10717 warning (OPT_Wconversion,
10719 ? G_("conversion to a reference to void "
10720 "will never use a type conversion operator")
10721 : G_("conversion to void "
10722 "will never use a type conversion operator"));
10723 else if (class_type)
10725 if (t == class_type)
10726 warning (OPT_Wconversion,
10728 ? G_("conversion to a reference to the same type "
10729 "will never use a type conversion operator")
10730 : G_("conversion to the same type "
10731 "will never use a type conversion operator"));
10732 /* Don't force t to be complete here. */
10733 else if (MAYBE_CLASS_TYPE_P (t)
10734 && COMPLETE_TYPE_P (t)
10735 && DERIVED_FROM_P (t, class_type))
10736 warning (OPT_Wconversion,
10738 ? G_("conversion to a reference to a base class "
10739 "will never use a type conversion operator")
10740 : G_("conversion to a base class "
10741 "will never use a type conversion operator"));
10746 if (operator_code == COND_EXPR)
10749 error ("ISO C++ prohibits overloading operator ?:");
10752 else if (ellipsis_p)
10754 error ("%qD must not have variable number of arguments", decl);
10757 else if (ambi_op_p (operator_code))
10760 /* We pick the one-argument operator codes by default, so
10761 we don't have to change anything. */
10763 else if (arity == 2)
10765 /* If we thought this was a unary operator, we now know
10766 it to be a binary operator. */
10767 switch (operator_code)
10770 operator_code = MULT_EXPR;
10774 operator_code = BIT_AND_EXPR;
10777 case UNARY_PLUS_EXPR:
10778 operator_code = PLUS_EXPR;
10782 operator_code = MINUS_EXPR;
10785 case PREINCREMENT_EXPR:
10786 operator_code = POSTINCREMENT_EXPR;
10789 case PREDECREMENT_EXPR:
10790 operator_code = POSTDECREMENT_EXPR;
10794 gcc_unreachable ();
10797 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10799 if ((operator_code == POSTINCREMENT_EXPR
10800 || operator_code == POSTDECREMENT_EXPR)
10801 && ! processing_template_decl
10802 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10805 error ("postfix %qD must take %<int%> as its argument",
10808 error ("postfix %qD must take %<int%> as its second "
10816 error ("%qD must take either zero or one argument", decl);
10818 error ("%qD must take either one or two arguments", decl);
10822 /* More Effective C++ rule 6. */
10824 && (operator_code == POSTINCREMENT_EXPR
10825 || operator_code == POSTDECREMENT_EXPR
10826 || operator_code == PREINCREMENT_EXPR
10827 || operator_code == PREDECREMENT_EXPR))
10829 tree arg = TREE_VALUE (argtypes);
10830 tree ret = TREE_TYPE (TREE_TYPE (decl));
10831 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10832 arg = TREE_TYPE (arg);
10833 arg = TYPE_MAIN_VARIANT (arg);
10834 if (operator_code == PREINCREMENT_EXPR
10835 || operator_code == PREDECREMENT_EXPR)
10837 if (TREE_CODE (ret) != REFERENCE_TYPE
10838 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10840 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10841 build_reference_type (arg));
10845 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10846 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10850 else if (unary_op_p (operator_code))
10855 error ("%qD must take %<void%>", decl);
10857 error ("%qD must take exactly one argument", decl);
10861 else /* if (binary_op_p (operator_code)) */
10866 error ("%qD must take exactly one argument", decl);
10868 error ("%qD must take exactly two arguments", decl);
10872 /* More Effective C++ rule 7. */
10874 && (operator_code == TRUTH_ANDIF_EXPR
10875 || operator_code == TRUTH_ORIF_EXPR
10876 || operator_code == COMPOUND_EXPR))
10877 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10881 /* Effective C++ rule 23. */
10884 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10885 && (operator_code == PLUS_EXPR
10886 || operator_code == MINUS_EXPR
10887 || operator_code == TRUNC_DIV_EXPR
10888 || operator_code == MULT_EXPR
10889 || operator_code == TRUNC_MOD_EXPR)
10890 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10891 warning (OPT_Weffc__, "%qD should return by value", decl);
10893 /* [over.oper]/8 */
10894 for (; argtypes && argtypes != void_list_node;
10895 argtypes = TREE_CHAIN (argtypes))
10896 if (TREE_PURPOSE (argtypes))
10898 TREE_PURPOSE (argtypes) = NULL_TREE;
10899 if (operator_code == POSTINCREMENT_EXPR
10900 || operator_code == POSTDECREMENT_EXPR)
10902 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10907 error ("%qD cannot have default arguments", decl);
10915 /* Return a string giving the keyword associate with CODE. */
10917 static const char *
10918 tag_name (enum tag_types code)
10930 case typename_type:
10933 gcc_unreachable ();
10937 /* Name lookup in an elaborated-type-specifier (after the keyword
10938 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10939 elaborated-type-specifier is invalid, issue a diagnostic and return
10940 error_mark_node; otherwise, return the *_TYPE to which it referred.
10941 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10944 check_elaborated_type_specifier (enum tag_types tag_code,
10946 bool allow_template_p)
10952 struct S { struct S *p; };
10954 name lookup will find the TYPE_DECL for the implicit "S::S"
10955 typedef. Adjust for that here. */
10956 if (DECL_SELF_REFERENCE_P (decl))
10957 decl = TYPE_NAME (TREE_TYPE (decl));
10959 type = TREE_TYPE (decl);
10961 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10962 is false for this case as well. */
10963 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10965 error ("using template type parameter %qT after %qs",
10966 type, tag_name (tag_code));
10967 return error_mark_node;
10971 If the identifier resolves to a typedef-name or a template
10972 type-parameter, the elaborated-type-specifier is ill-formed.
10974 In other words, the only legitimate declaration to use in the
10975 elaborated type specifier is the implicit typedef created when
10976 the type is declared. */
10977 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10978 && !DECL_SELF_REFERENCE_P (decl)
10979 && tag_code != typename_type)
10981 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10982 error ("%q+D has a previous declaration here", decl);
10983 return error_mark_node;
10985 else if (TREE_CODE (type) != RECORD_TYPE
10986 && TREE_CODE (type) != UNION_TYPE
10987 && tag_code != enum_type
10988 && tag_code != typename_type)
10990 error ("%qT referred to as %qs", type, tag_name (tag_code));
10991 error ("%q+T has a previous declaration here", type);
10992 return error_mark_node;
10994 else if (TREE_CODE (type) != ENUMERAL_TYPE
10995 && tag_code == enum_type)
10997 error ("%qT referred to as enum", type);
10998 error ("%q+T has a previous declaration here", type);
10999 return error_mark_node;
11001 else if (!allow_template_p
11002 && TREE_CODE (type) == RECORD_TYPE
11003 && CLASSTYPE_IS_TEMPLATE (type))
11005 /* If a class template appears as elaborated type specifier
11006 without a template header such as:
11008 template <class T> class C {};
11009 void f(class C); // No template header here
11011 then the required template argument is missing. */
11012 error ("template argument required for %<%s %T%>",
11013 tag_name (tag_code),
11014 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11015 return error_mark_node;
11021 /* Lookup NAME in elaborate type specifier in scope according to
11022 SCOPE and issue diagnostics if necessary.
11023 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11024 found, and ERROR_MARK_NODE for type error. */
11027 lookup_and_check_tag (enum tag_types tag_code, tree name,
11028 tag_scope scope, bool template_header_p)
11032 if (scope == ts_global)
11034 /* First try ordinary name lookup, ignoring hidden class name
11035 injected via friend declaration. */
11036 decl = lookup_name_prefer_type (name, 2);
11037 /* If that fails, the name will be placed in the smallest
11038 non-class, non-function-prototype scope according to 3.3.1/5.
11039 We may already have a hidden name declared as friend in this
11040 scope. So lookup again but not ignoring hidden names.
11041 If we find one, that name will be made visible rather than
11042 creating a new tag. */
11044 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11047 decl = lookup_type_scope (name, scope);
11049 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11050 decl = DECL_TEMPLATE_RESULT (decl);
11052 if (decl && TREE_CODE (decl) == TYPE_DECL)
11054 /* Look for invalid nested type:
11058 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11060 error ("%qD has the same name as the class in which it is "
11063 return error_mark_node;
11066 /* Two cases we need to consider when deciding if a class
11067 template is allowed as an elaborated type specifier:
11068 1. It is a self reference to its own class.
11069 2. It comes with a template header.
11073 template <class T> class C {
11074 class C *c1; // DECL_SELF_REFERENCE_P is true
11077 template <class U> class C; // template_header_p is true
11078 template <class T> class C<T>::D {
11079 class C *c2; // DECL_SELF_REFERENCE_P is true
11082 t = check_elaborated_type_specifier (tag_code,
11085 | DECL_SELF_REFERENCE_P (decl));
11088 else if (decl && TREE_CODE (decl) == TREE_LIST)
11090 error ("reference to %qD is ambiguous", name);
11091 print_candidates (decl);
11092 return error_mark_node;
11098 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11099 Define the tag as a forward-reference if it is not defined.
11101 If a declaration is given, process it here, and report an error if
11102 multiple declarations are not identical.
11104 SCOPE is TS_CURRENT when this is also a definition. Only look in
11105 the current frame for the name (since C++ allows new names in any
11106 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11107 declaration. Only look beginning from the current scope outward up
11108 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11110 TEMPLATE_HEADER_P is true when this declaration is preceded by
11111 a set of template parameters. */
11114 xref_tag (enum tag_types tag_code, tree name,
11115 tag_scope scope, bool template_header_p)
11117 enum tree_code code;
11119 tree context = NULL_TREE;
11121 timevar_push (TV_NAME_LOOKUP);
11123 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11129 code = RECORD_TYPE;
11135 code = ENUMERAL_TYPE;
11138 gcc_unreachable ();
11141 /* In case of anonymous name, xref_tag is only called to
11142 make type node and push name. Name lookup is not required. */
11143 if (ANON_AGGRNAME_P (name))
11146 t = lookup_and_check_tag (tag_code, name,
11147 scope, template_header_p);
11149 if (t == error_mark_node)
11150 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11152 if (scope != ts_current && t && current_class_type
11153 && template_class_depth (current_class_type)
11154 && template_header_p)
11156 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11157 definition of this tag. Since, in addition, we are currently
11158 processing a (member) template declaration of a template
11159 class, we must be very careful; consider:
11166 { template <class V>
11167 friend struct S1; };
11169 Here, the S2::S1 declaration should not be confused with the
11170 outer declaration. In particular, the inner version should
11171 have a template parameter of level 2, not level 1. This
11172 would be particularly important if the member declaration
11175 template <class V = U> friend struct S1;
11177 say, when we should tsubst into `U' when instantiating
11178 S2. On the other hand, when presented with:
11188 we must find the inner binding eventually. We
11189 accomplish this by making sure that the new type we
11190 create to represent this declaration has the right
11192 context = TYPE_CONTEXT (t);
11198 /* If no such tag is yet defined, create a forward-reference node
11199 and record it as the "definition".
11200 When a real declaration of this type is found,
11201 the forward-reference will be altered into a real type. */
11202 if (code == ENUMERAL_TYPE)
11204 error ("use of enum %q#D without previous declaration", name);
11205 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11209 t = make_class_type (code);
11210 TYPE_CONTEXT (t) = context;
11211 t = pushtag (name, t, scope);
11216 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11218 if (!redeclare_class_template (t, current_template_parms))
11219 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11221 else if (!processing_template_decl
11222 && CLASS_TYPE_P (t)
11223 && CLASSTYPE_IS_TEMPLATE (t))
11225 error ("redeclaration of %qT as a non-template", t);
11226 error ("previous declaration %q+D", t);
11227 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11230 /* Make injected friend class visible. */
11231 if (scope != ts_within_enclosing_non_class
11232 && hidden_name_p (TYPE_NAME (t)))
11234 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11235 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11237 if (TYPE_TEMPLATE_INFO (t))
11239 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11240 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11245 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11249 xref_tag_from_type (tree old, tree id, tag_scope scope)
11251 enum tag_types tag_kind;
11253 if (TREE_CODE (old) == RECORD_TYPE)
11254 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11256 tag_kind = union_type;
11258 if (id == NULL_TREE)
11259 id = TYPE_IDENTIFIER (old);
11261 return xref_tag (tag_kind, id, scope, false);
11264 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11265 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11266 access_* node, and the TREE_VALUE is the type of the base-class.
11267 Non-NULL TREE_TYPE indicates virtual inheritance.
11269 Returns true if the binfo hierarchy was successfully created,
11270 false if an error was detected. */
11273 xref_basetypes (tree ref, tree base_list)
11276 tree binfo, base_binfo;
11277 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11278 unsigned max_bases = 0; /* Maximum direct bases. */
11280 tree default_access;
11281 tree igo_prev; /* Track Inheritance Graph Order. */
11283 if (ref == error_mark_node)
11286 /* The base of a derived class is private by default, all others are
11288 default_access = (TREE_CODE (ref) == RECORD_TYPE
11289 && CLASSTYPE_DECLARED_CLASS (ref)
11290 ? access_private_node : access_public_node);
11292 /* First, make sure that any templates in base-classes are
11293 instantiated. This ensures that if we call ourselves recursively
11294 we do not get confused about which classes are marked and which
11296 basep = &base_list;
11299 tree basetype = TREE_VALUE (*basep);
11301 if (!(processing_template_decl && uses_template_parms (basetype))
11302 && !complete_type_or_else (basetype, NULL))
11303 /* An incomplete type. Remove it from the list. */
11304 *basep = TREE_CHAIN (*basep);
11308 if (TREE_TYPE (*basep))
11310 if (CLASS_TYPE_P (basetype))
11311 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11312 basep = &TREE_CHAIN (*basep);
11316 TYPE_MARKED_P (ref) = 1;
11318 /* The binfo slot should be empty, unless this is an (ill-formed)
11320 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11322 error ("redefinition of %q#T", ref);
11326 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11328 binfo = make_tree_binfo (max_bases);
11330 TYPE_BINFO (ref) = binfo;
11331 BINFO_OFFSET (binfo) = size_zero_node;
11332 BINFO_TYPE (binfo) = ref;
11334 /* Apply base-class info set up to the variants of this type. */
11335 fixup_type_variants (ref);
11339 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11340 /* An aggregate cannot have baseclasses. */
11341 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11343 if (TREE_CODE (ref) == UNION_TYPE)
11345 error ("derived union %qT invalid", ref);
11352 if (TYPE_FOR_JAVA (ref))
11354 error ("Java class %qT cannot have multiple bases", ref);
11361 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11363 if (TYPE_FOR_JAVA (ref))
11365 error ("Java class %qT cannot have virtual bases", ref);
11370 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11372 tree access = TREE_PURPOSE (base_list);
11373 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11374 tree basetype = TREE_VALUE (base_list);
11376 if (access == access_default_node)
11377 access = default_access;
11379 if (PACK_EXPANSION_P (basetype))
11380 basetype = PACK_EXPANSION_PATTERN (basetype);
11381 if (TREE_CODE (basetype) == TYPE_DECL)
11382 basetype = TREE_TYPE (basetype);
11383 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11385 error ("base type %qT fails to be a struct or class type",
11390 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11391 TYPE_FOR_JAVA (ref) = 1;
11393 base_binfo = NULL_TREE;
11394 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11396 base_binfo = TYPE_BINFO (basetype);
11397 /* The original basetype could have been a typedef'd type. */
11398 basetype = BINFO_TYPE (base_binfo);
11400 /* Inherit flags from the base. */
11401 TYPE_HAS_NEW_OPERATOR (ref)
11402 |= TYPE_HAS_NEW_OPERATOR (basetype);
11403 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11404 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11405 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11406 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11407 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11408 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11409 CLASSTYPE_REPEATED_BASE_P (ref)
11410 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11413 /* We must do this test after we've seen through a typedef
11415 if (TYPE_MARKED_P (basetype))
11417 if (basetype == ref)
11418 error ("recursive type %qT undefined", basetype);
11420 error ("duplicate base type %qT invalid", basetype);
11424 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11425 /* Regenerate the pack expansion for the bases. */
11426 basetype = make_pack_expansion (basetype);
11428 TYPE_MARKED_P (basetype) = 1;
11430 base_binfo = copy_binfo (base_binfo, basetype, ref,
11431 &igo_prev, via_virtual);
11432 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11433 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11435 BINFO_BASE_APPEND (binfo, base_binfo);
11436 BINFO_BASE_ACCESS_APPEND (binfo, access);
11439 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11440 /* If we have space in the vbase vector, we must have shared at
11441 least one of them, and are therefore diamond shaped. */
11442 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11444 /* Unmark all the types. */
11445 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11446 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11447 TYPE_MARKED_P (ref) = 0;
11449 /* Now see if we have a repeated base type. */
11450 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11452 for (base_binfo = binfo; base_binfo;
11453 base_binfo = TREE_CHAIN (base_binfo))
11455 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11457 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11460 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11462 for (base_binfo = binfo; base_binfo;
11463 base_binfo = TREE_CHAIN (base_binfo))
11464 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11465 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11474 /* Copies the enum-related properties from type SRC to type DST.
11475 Used with the underlying type of an enum and the enum itself. */
11477 copy_type_enum (tree dst, tree src)
11479 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11480 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11481 TYPE_SIZE (dst) = TYPE_SIZE (src);
11482 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11483 SET_TYPE_MODE (dst, TYPE_MODE (src));
11484 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11485 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11486 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11487 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11490 /* Begin compiling the definition of an enumeration type.
11493 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11495 UNDERLYING_TYPE is the type that will be used as the storage for
11496 the enumeration type. This should be NULL_TREE if no storage type
11499 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11501 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11503 Returns the type object, as yet incomplete.
11504 Also records info about it so that build_enumerator
11505 may be used to declare the individual values as they are read. */
11508 start_enum (tree name, tree enumtype, tree underlying_type,
11509 bool scoped_enum_p, bool *is_new)
11511 tree prevtype = NULL_TREE;
11512 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11516 /* [C++0x dcl.enum]p5:
11518 If not explicitly specified, the underlying type of a scoped
11519 enumeration type is int. */
11520 if (!underlying_type && scoped_enum_p)
11521 underlying_type = integer_type_node;
11523 if (underlying_type)
11524 underlying_type = cv_unqualified (underlying_type);
11526 /* If this is the real definition for a previous forward reference,
11527 fill in the contents in the same object that used to be the
11528 forward reference. */
11530 enumtype = lookup_and_check_tag (enum_type, name,
11531 /*tag_scope=*/ts_current,
11532 /*template_header_p=*/false);
11534 /* In case of a template_decl, the only check that should be deferred
11535 to instantiation time is the comparison of underlying types. */
11536 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11538 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11540 error_at (input_location, "scoped/unscoped mismatch "
11541 "in enum %q#T", enumtype);
11542 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11543 "previous definition here");
11544 enumtype = error_mark_node;
11546 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11548 error_at (input_location, "underlying type mismatch "
11549 "in enum %q#T", enumtype);
11550 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11551 "previous definition here");
11552 enumtype = error_mark_node;
11554 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11555 && !dependent_type_p (underlying_type)
11556 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11557 && !same_type_p (underlying_type,
11558 ENUM_UNDERLYING_TYPE (enumtype)))
11560 error_at (input_location, "different underlying type "
11561 "in enum %q#T", enumtype);
11562 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11563 "previous definition here");
11564 underlying_type = NULL_TREE;
11568 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11569 || processing_template_decl)
11571 /* In case of error, make a dummy enum to allow parsing to
11573 if (enumtype == error_mark_node)
11575 name = make_anon_name ();
11576 enumtype = NULL_TREE;
11579 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11580 of an opaque enum, or an opaque enum of an already defined
11581 enumeration (C++0x only).
11582 In any other case, it'll be NULL_TREE. */
11588 prevtype = enumtype;
11589 enumtype = cxx_make_type (ENUMERAL_TYPE);
11590 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11591 if (enumtype == error_mark_node)
11592 return error_mark_node;
11594 /* The enum is considered opaque until the opening '{' of the
11595 enumerator list. */
11596 SET_OPAQUE_ENUM_P (enumtype, true);
11597 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11600 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11602 if (underlying_type)
11604 if (CP_INTEGRAL_TYPE_P (underlying_type))
11606 copy_type_enum (enumtype, underlying_type);
11607 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11609 else if (dependent_type_p (underlying_type))
11610 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11612 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11613 underlying_type, enumtype);
11616 /* If into a template class, the returned enum is always the first
11617 declaration (opaque or not) seen. This way all the references to
11618 this type will be to the same declaration. The following ones are used
11619 only to check for definition errors. */
11620 if (prevtype && processing_template_decl)
11626 /* After processing and defining all the values of an enumeration type,
11627 install their decls in the enumeration type.
11628 ENUMTYPE is the type object. */
11631 finish_enum_value_list (tree enumtype)
11634 tree underlying_type;
11637 tree minnode, maxnode;
11640 bool fixed_underlying_type_p
11641 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11643 /* We built up the VALUES in reverse order. */
11644 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11646 /* For an enum defined in a template, just set the type of the values;
11647 all further processing is postponed until the template is
11648 instantiated. We need to set the type so that tsubst of a CONST_DECL
11650 if (processing_template_decl)
11652 for (values = TYPE_VALUES (enumtype);
11654 values = TREE_CHAIN (values))
11655 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11659 /* Determine the minimum and maximum values of the enumerators. */
11660 if (TYPE_VALUES (enumtype))
11662 minnode = maxnode = NULL_TREE;
11664 for (values = TYPE_VALUES (enumtype);
11666 values = TREE_CHAIN (values))
11668 decl = TREE_VALUE (values);
11670 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11671 each enumerator has the type of its enumeration. Prior to the
11672 closing brace, the type of each enumerator is the type of its
11673 initializing value. */
11674 TREE_TYPE (decl) = enumtype;
11676 /* Update the minimum and maximum values, if appropriate. */
11677 value = DECL_INITIAL (decl);
11678 if (value == error_mark_node)
11679 value = integer_zero_node;
11680 /* Figure out what the minimum and maximum values of the
11681 enumerators are. */
11683 minnode = maxnode = value;
11684 else if (tree_int_cst_lt (maxnode, value))
11686 else if (tree_int_cst_lt (value, minnode))
11693 If the enumerator-list is empty, the underlying type is as if
11694 the enumeration had a single enumerator with value 0. */
11695 minnode = maxnode = integer_zero_node;
11697 if (!fixed_underlying_type_p)
11699 /* Compute the number of bits require to represent all values of the
11700 enumeration. We must do this before the type of MINNODE and
11701 MAXNODE are transformed, since tree_int_cst_min_precision relies
11702 on the TREE_TYPE of the value it is passed. */
11703 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11704 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11705 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11706 int precision = MAX (lowprec, highprec);
11708 bool use_short_enum;
11710 /* Determine the underlying type of the enumeration.
11714 The underlying type of an enumeration is an integral type that
11715 can represent all the enumerator values defined in the
11716 enumeration. It is implementation-defined which integral type is
11717 used as the underlying type for an enumeration except that the
11718 underlying type shall not be larger than int unless the value of
11719 an enumerator cannot fit in an int or unsigned int.
11721 We use "int" or an "unsigned int" as the underlying type, even if
11722 a smaller integral type would work, unless the user has
11723 explicitly requested that we use the smallest possible type. The
11724 user can request that for all enumerations with a command line
11725 flag, or for just one enumeration with an attribute. */
11727 use_short_enum = flag_short_enums
11728 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11730 for (itk = (use_short_enum ? itk_char : itk_int);
11734 underlying_type = integer_types[itk];
11735 if (underlying_type != NULL_TREE
11736 && TYPE_PRECISION (underlying_type) >= precision
11737 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11740 if (itk == itk_none)
11744 IF no integral type can represent all the enumerator values, the
11745 enumeration is ill-formed. */
11746 error ("no integral type can represent all of the enumerator values "
11747 "for %qT", enumtype);
11748 precision = TYPE_PRECISION (long_long_integer_type_node);
11749 underlying_type = integer_types[itk_unsigned_long_long];
11754 The value of sizeof() applied to an enumeration type, an object
11755 of an enumeration type, or an enumerator, is the value of sizeof()
11756 applied to the underlying type. */
11757 copy_type_enum (enumtype, underlying_type);
11759 /* Compute the minimum and maximum values for the type.
11763 For an enumeration where emin is the smallest enumerator and emax
11764 is the largest, the values of the enumeration are the values of the
11765 underlying type in the range bmin to bmax, where bmin and bmax are,
11766 respectively, the smallest and largest values of the smallest bit-
11767 field that can store emin and emax. */
11769 /* The middle-end currently assumes that types with TYPE_PRECISION
11770 narrower than their underlying type are suitably zero or sign
11771 extended to fill their mode. Similarly, it assumes that the front
11772 end assures that a value of a particular type must be within
11773 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11775 We used to set these fields based on bmin and bmax, but that led
11776 to invalid assumptions like optimizing away bounds checking. So
11777 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11778 TYPE_MAX_VALUE to the values for the mode above and only restrict
11779 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11780 ENUM_UNDERLYING_TYPE (enumtype)
11781 = build_distinct_type_copy (underlying_type);
11782 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11783 set_min_and_max_values_for_integral_type
11784 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11786 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11787 if (flag_strict_enums)
11788 set_min_and_max_values_for_integral_type (enumtype, precision,
11792 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11794 /* Convert each of the enumerators to the type of the underlying
11795 type of the enumeration. */
11796 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11798 location_t saved_location;
11800 decl = TREE_VALUE (values);
11801 saved_location = input_location;
11802 input_location = DECL_SOURCE_LOCATION (decl);
11803 if (fixed_underlying_type_p)
11804 /* If the enumeration type has a fixed underlying type, we
11805 already checked all of the enumerator values. */
11806 value = DECL_INITIAL (decl);
11808 value = perform_implicit_conversion (underlying_type,
11809 DECL_INITIAL (decl),
11810 tf_warning_or_error);
11811 input_location = saved_location;
11813 /* Do not clobber shared ints. */
11814 value = copy_node (value);
11816 TREE_TYPE (value) = enumtype;
11817 DECL_INITIAL (decl) = value;
11820 /* Fix up all variant types of this enum type. */
11821 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11822 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11824 /* Finish debugging output for this type. */
11825 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11828 /* Finishes the enum type. This is called only the first time an
11829 enumeration is seen, be it opaque or odinary.
11830 ENUMTYPE is the type object. */
11833 finish_enum (tree enumtype)
11835 if (processing_template_decl)
11837 if (at_function_scope_p ())
11838 add_stmt (build_min (TAG_DEFN, enumtype));
11842 /* Here there should not be any variants of this type. */
11843 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11844 && !TYPE_NEXT_VARIANT (enumtype));
11847 /* Build and install a CONST_DECL for an enumeration constant of the
11848 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11849 LOC is the location of NAME.
11850 Assignment of sequential values by default is handled here. */
11853 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11859 /* If the VALUE was erroneous, pretend it wasn't there; that will
11860 result in the enum being assigned the next value in sequence. */
11861 if (value == error_mark_node)
11864 /* Remove no-op casts from the value. */
11866 STRIP_TYPE_NOPS (value);
11868 if (! processing_template_decl)
11870 /* Validate and default VALUE. */
11871 if (value != NULL_TREE)
11873 value = cxx_constant_value (value);
11875 if (TREE_CODE (value) == INTEGER_CST
11876 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
11878 value = perform_integral_promotions (value);
11882 error ("enumerator value for %qD is not an integer constant", name);
11887 /* Default based on previous value. */
11888 if (value == NULL_TREE)
11890 if (TYPE_VALUES (enumtype))
11893 unsigned HOST_WIDE_INT lo;
11897 /* The next value is the previous value plus one.
11898 add_double doesn't know the type of the target expression,
11899 so we must check with int_fits_type_p as well. */
11900 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11901 if (error_operand_p (prev_value))
11902 value = error_mark_node;
11905 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11906 TREE_INT_CST_HIGH (prev_value),
11908 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11910 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11914 error ("overflow in enumeration values at %qD", name);
11915 value = error_mark_node;
11920 value = integer_zero_node;
11923 /* Remove no-op casts from the value. */
11924 STRIP_TYPE_NOPS (value);
11926 /* If the underlying type of the enum is fixed, check whether
11927 the enumerator values fits in the underlying type. If it
11928 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11929 if (ENUM_UNDERLYING_TYPE (enumtype)
11931 && TREE_CODE (value) == INTEGER_CST
11932 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11934 error ("enumerator value %E is too large for underlying type %<%T%>",
11935 value, ENUM_UNDERLYING_TYPE (enumtype));
11937 /* Silently convert the value so that we can continue. */
11938 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11943 /* C++ associates enums with global, function, or class declarations. */
11944 context = current_scope ();
11946 /* Build the actual enumeration constant. Note that the enumeration
11947 constants have the underlying type of the enum (if it is fixed)
11948 or the type of their initializer (if the underlying type of the
11949 enum is not fixed):
11953 If the underlying type is fixed, the type of each enumerator
11954 prior to the closing brace is the underlying type; if the
11955 initializing value of an enumerator cannot be represented by
11956 the underlying type, the program is ill-formed. If the
11957 underlying type is not fixed, the type of each enumerator is
11958 the type of its initializing value.
11960 If the underlying type is not fixed, it will be computed by
11961 finish_enum and we will reset the type of this enumerator. Of
11962 course, if we're processing a template, there may be no value. */
11963 type = value ? TREE_TYPE (value) : NULL_TREE;
11965 if (context && context == current_class_type)
11966 /* This enum declaration is local to the class. We need the full
11967 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11968 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11970 /* It's a global enum, or it's local to a function. (Note local to
11971 a function could mean local to a class method. */
11972 decl = build_decl (loc, CONST_DECL, name, type);
11974 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11975 TREE_CONSTANT (decl) = 1;
11976 TREE_READONLY (decl) = 1;
11977 DECL_INITIAL (decl) = value;
11979 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11980 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11981 on the TYPE_FIELDS list for `S'. (That's so that you can say
11982 things like `S::i' later.) */
11983 finish_member_declaration (decl);
11987 /* Add this enumeration constant to the list for this type. */
11988 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11991 /* Look for an enumerator with the given NAME within the enumeration
11992 type ENUMTYPE. This routine is used primarily for qualified name
11993 lookup into an enumerator in C++0x, e.g.,
11995 enum class Color { Red, Green, Blue };
11997 Color color = Color::Red;
11999 Returns the value corresponding to the enumerator, or
12000 NULL_TREE if no such enumerator was found. */
12002 lookup_enumerator (tree enumtype, tree name)
12005 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12007 e = purpose_member (name, TYPE_VALUES (enumtype));
12008 return e? TREE_VALUE (e) : NULL_TREE;
12012 /* We're defining DECL. Make sure that its type is OK. */
12015 check_function_type (tree decl, tree current_function_parms)
12017 tree fntype = TREE_TYPE (decl);
12018 tree return_type = complete_type (TREE_TYPE (fntype));
12020 /* In a function definition, arg types must be complete. */
12021 require_complete_types_for_parms (current_function_parms);
12023 if (dependent_type_p (return_type))
12025 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12026 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12028 tree args = TYPE_ARG_TYPES (fntype);
12030 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12031 error ("return type %q#T is incomplete", return_type);
12033 error ("return type has Java class type %q#T", return_type);
12035 /* Make it return void instead. */
12036 if (TREE_CODE (fntype) == METHOD_TYPE)
12037 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12039 TREE_CHAIN (args));
12041 fntype = build_function_type (void_type_node, args);
12043 = build_exception_variant (fntype,
12044 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12045 fntype = (cp_build_type_attribute_variant
12046 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12047 TREE_TYPE (decl) = fntype;
12050 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12053 /* Create the FUNCTION_DECL for a function definition.
12054 DECLSPECS and DECLARATOR are the parts of the declaration;
12055 they describe the function's name and the type it returns,
12056 but twisted together in a fashion that parallels the syntax of C.
12058 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12059 DECLARATOR is really the DECL for the function we are about to
12060 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12061 indicating that the function is an inline defined in-class.
12063 This function creates a binding context for the function body
12064 as well as setting up the FUNCTION_DECL in current_function_decl.
12066 For C++, we must first check whether that datum makes any sense.
12067 For example, "class A local_a(1,2);" means that variable local_a
12068 is an aggregate of type A, which should have a constructor
12069 applied to it with the argument list [1, 2].
12071 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12072 or may be a BLOCK if the function has been defined previously
12073 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12074 error_mark_node if the function has never been defined, or
12075 a BLOCK if the function has been defined somewhere. */
12078 start_preparsed_function (tree decl1, tree attrs, int flags)
12080 tree ctype = NULL_TREE;
12083 int doing_friend = 0;
12084 struct cp_binding_level *bl;
12085 tree current_function_parms;
12086 struct c_fileinfo *finfo
12087 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12088 bool honor_interface;
12090 /* Sanity check. */
12091 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12092 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12094 fntype = TREE_TYPE (decl1);
12095 if (TREE_CODE (fntype) == METHOD_TYPE)
12096 ctype = TYPE_METHOD_BASETYPE (fntype);
12098 /* ISO C++ 11.4/5. A friend function defined in a class is in
12099 the (lexical) scope of the class in which it is defined. */
12100 if (!ctype && DECL_FRIEND_P (decl1))
12102 ctype = DECL_FRIEND_CONTEXT (decl1);
12104 /* CTYPE could be null here if we're dealing with a template;
12105 for example, `inline friend float foo()' inside a template
12106 will have no CTYPE set. */
12107 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12113 if (DECL_DECLARED_INLINE_P (decl1)
12114 && lookup_attribute ("noinline", attrs))
12115 warning (0, "inline function %q+D given attribute noinline", decl1);
12117 /* Handle gnu_inline attribute. */
12118 if (GNU_INLINE_P (decl1))
12120 DECL_EXTERNAL (decl1) = 1;
12121 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12122 DECL_INTERFACE_KNOWN (decl1) = 1;
12123 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12126 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12127 /* This is a constructor, we must ensure that any default args
12128 introduced by this definition are propagated to the clones
12129 now. The clones are used directly in overload resolution. */
12130 adjust_clone_args (decl1);
12132 /* Sometimes we don't notice that a function is a static member, and
12133 build a METHOD_TYPE for it. Fix that up now. */
12134 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12135 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
12137 revert_static_member_fn (decl1);
12141 /* Set up current_class_type, and enter the scope of the class, if
12144 push_nested_class (ctype);
12145 else if (DECL_STATIC_FUNCTION_P (decl1))
12146 push_nested_class (DECL_CONTEXT (decl1));
12148 /* Now that we have entered the scope of the class, we must restore
12149 the bindings for any template parameters surrounding DECL1, if it
12150 is an inline member template. (Order is important; consider the
12151 case where a template parameter has the same name as a field of
12152 the class.) It is not until after this point that
12153 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12154 if (flags & SF_INCLASS_INLINE)
12155 maybe_begin_member_template_processing (decl1);
12157 /* Effective C++ rule 15. */
12159 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12160 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12161 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12163 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12164 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12165 if (!DECL_INITIAL (decl1))
12166 DECL_INITIAL (decl1) = error_mark_node;
12168 /* This function exists in static storage.
12169 (This does not mean `static' in the C sense!) */
12170 TREE_STATIC (decl1) = 1;
12172 /* We must call push_template_decl after current_class_type is set
12173 up. (If we are processing inline definitions after exiting a
12174 class scope, current_class_type will be NULL_TREE until set above
12175 by push_nested_class.) */
12176 if (processing_template_decl)
12178 /* FIXME: Handle error_mark_node more gracefully. */
12179 tree newdecl1 = push_template_decl (decl1);
12180 if (newdecl1 != error_mark_node)
12184 /* We are now in the scope of the function being defined. */
12185 current_function_decl = decl1;
12187 /* Save the parm names or decls from this function's declarator
12188 where store_parm_decls will find them. */
12189 current_function_parms = DECL_ARGUMENTS (decl1);
12191 /* Make sure the parameter and return types are reasonable. When
12192 you declare a function, these types can be incomplete, but they
12193 must be complete when you define the function. */
12194 check_function_type (decl1, current_function_parms);
12196 /* Build the return declaration for the function. */
12197 restype = TREE_TYPE (fntype);
12198 if (DECL_RESULT (decl1) == NULL_TREE)
12202 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12203 DECL_ARTIFICIAL (resdecl) = 1;
12204 DECL_IGNORED_P (resdecl) = 1;
12205 DECL_RESULT (decl1) = resdecl;
12207 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12210 /* Let the user know we're compiling this function. */
12211 announce_function (decl1);
12213 /* Record the decl so that the function name is defined.
12214 If we already have a decl for this name, and it is a FUNCTION_DECL,
12215 use the old decl. */
12216 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12218 /* A specialization is not used to guide overload resolution. */
12219 if (!DECL_FUNCTION_MEMBER_P (decl1)
12220 && !(DECL_USE_TEMPLATE (decl1) &&
12221 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12223 tree olddecl = pushdecl (decl1);
12225 if (olddecl == error_mark_node)
12226 /* If something went wrong when registering the declaration,
12227 use DECL1; we have to have a FUNCTION_DECL to use when
12228 parsing the body of the function. */
12232 /* Otherwise, OLDDECL is either a previous declaration
12233 of the same function or DECL1 itself. */
12235 if (warn_missing_declarations
12236 && olddecl == decl1
12237 && !DECL_MAIN_P (decl1)
12238 && TREE_PUBLIC (decl1)
12239 && !DECL_DECLARED_INLINE_P (decl1))
12243 /* Check whether DECL1 is in an anonymous
12245 for (context = DECL_CONTEXT (decl1);
12247 context = DECL_CONTEXT (context))
12249 if (TREE_CODE (context) == NAMESPACE_DECL
12250 && DECL_NAME (context) == NULL_TREE)
12254 if (context == NULL)
12255 warning (OPT_Wmissing_declarations,
12256 "no previous declaration for %q+D", decl1);
12264 /* We need to set the DECL_CONTEXT. */
12265 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12266 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12268 fntype = TREE_TYPE (decl1);
12270 /* If #pragma weak applies, mark the decl appropriately now.
12271 The pragma only applies to global functions. Because
12272 determining whether or not the #pragma applies involves
12273 computing the mangled name for the declaration, we cannot
12274 apply the pragma until after we have merged this declaration
12275 with any previous declarations; if the original declaration
12276 has a linkage specification, that specification applies to
12277 the definition as well, and may affect the mangled name. */
12278 if (DECL_FILE_SCOPE_P (decl1))
12279 maybe_apply_pragma_weak (decl1);
12282 /* constexpr functions must have literal argument types and
12283 literal return type. */
12284 validate_constexpr_fundecl (decl1);
12286 /* Reset this in case the call to pushdecl changed it. */
12287 current_function_decl = decl1;
12289 gcc_assert (DECL_INITIAL (decl1));
12291 /* This function may already have been parsed, in which case just
12292 return; our caller will skip over the body without parsing. */
12293 if (DECL_INITIAL (decl1) != error_mark_node)
12296 /* Initialize RTL machinery. We cannot do this until
12297 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12298 even when processing a template; this is how we get
12299 CFUN set up, and our per-function variables initialized.
12300 FIXME factor out the non-RTL stuff. */
12301 bl = current_binding_level;
12302 allocate_struct_function (decl1, processing_template_decl);
12304 /* Initialize the language data structures. Whenever we start
12305 a new function, we destroy temporaries in the usual way. */
12306 cfun->language = ggc_alloc_cleared_language_function ();
12307 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12308 current_binding_level = bl;
12310 /* Even though we're inside a function body, we still don't want to
12311 call expand_expr to calculate the size of a variable-sized array.
12312 We haven't necessarily assigned RTL to all variables yet, so it's
12313 not safe to try to expand expressions involving them. */
12314 cfun->dont_save_pending_sizes_p = 1;
12316 /* Start the statement-tree, start the tree now. */
12317 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12319 /* If we are (erroneously) defining a function that we have already
12320 defined before, wipe out what we knew before. */
12321 if (!DECL_PENDING_INLINE_P (decl1))
12322 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12324 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12326 /* We know that this was set up by `grokclassfn'. We do not
12327 wait until `store_parm_decls', since evil parse errors may
12328 never get us to that point. Here we keep the consistency
12329 between `current_class_type' and `current_class_ptr'. */
12330 tree t = DECL_ARGUMENTS (decl1);
12332 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12333 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12335 cp_function_chain->x_current_class_ref
12336 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12337 cp_function_chain->x_current_class_ptr = t;
12339 /* Constructors and destructors need to know whether they're "in
12340 charge" of initializing virtual base classes. */
12341 t = DECL_CHAIN (t);
12342 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12344 current_in_charge_parm = t;
12345 t = DECL_CHAIN (t);
12347 if (DECL_HAS_VTT_PARM_P (decl1))
12349 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12350 current_vtt_parm = t;
12354 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12355 /* Implicitly-defined methods (like the
12356 destructor for a class in which no destructor
12357 is explicitly declared) must not be defined
12358 until their definition is needed. So, we
12359 ignore interface specifications for
12360 compiler-generated functions. */
12361 && !DECL_ARTIFICIAL (decl1));
12363 if (DECL_INTERFACE_KNOWN (decl1))
12365 tree ctx = decl_function_context (decl1);
12367 if (DECL_NOT_REALLY_EXTERN (decl1))
12368 DECL_EXTERNAL (decl1) = 0;
12370 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12371 && TREE_PUBLIC (ctx))
12372 /* This is a function in a local class in an extern inline
12374 comdat_linkage (decl1);
12376 /* If this function belongs to an interface, it is public.
12377 If it belongs to someone else's interface, it is also external.
12378 This only affects inlines and template instantiations. */
12379 else if (!finfo->interface_unknown && honor_interface)
12381 if (DECL_DECLARED_INLINE_P (decl1)
12382 || DECL_TEMPLATE_INSTANTIATION (decl1)
12383 || processing_template_decl)
12385 DECL_EXTERNAL (decl1)
12386 = (finfo->interface_only
12387 || (DECL_DECLARED_INLINE_P (decl1)
12388 && ! flag_implement_inlines
12389 && !DECL_VINDEX (decl1)));
12391 /* For WIN32 we also want to put these in linkonce sections. */
12392 maybe_make_one_only (decl1);
12395 DECL_EXTERNAL (decl1) = 0;
12396 DECL_INTERFACE_KNOWN (decl1) = 1;
12397 /* If this function is in an interface implemented in this file,
12398 make sure that the back end knows to emit this function
12400 if (!DECL_EXTERNAL (decl1))
12401 mark_needed (decl1);
12403 else if (finfo->interface_unknown && finfo->interface_only
12404 && honor_interface)
12406 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12407 interface, we will have both finfo->interface_unknown and
12408 finfo->interface_only set. In that case, we don't want to
12409 use the normal heuristics because someone will supply a
12410 #pragma implementation elsewhere, and deducing it here would
12411 produce a conflict. */
12412 comdat_linkage (decl1);
12413 DECL_EXTERNAL (decl1) = 0;
12414 DECL_INTERFACE_KNOWN (decl1) = 1;
12415 DECL_DEFER_OUTPUT (decl1) = 1;
12419 /* This is a definition, not a reference.
12420 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12421 if (!GNU_INLINE_P (decl1))
12422 DECL_EXTERNAL (decl1) = 0;
12424 if ((DECL_DECLARED_INLINE_P (decl1)
12425 || DECL_TEMPLATE_INSTANTIATION (decl1))
12426 && ! DECL_INTERFACE_KNOWN (decl1))
12427 DECL_DEFER_OUTPUT (decl1) = 1;
12429 DECL_INTERFACE_KNOWN (decl1) = 1;
12432 /* Determine the ELF visibility attribute for the function. We must not
12433 do this before calling "pushdecl", as we must allow "duplicate_decls"
12434 to merge any attributes appropriately. We also need to wait until
12436 if (!DECL_CLONED_FUNCTION_P (decl1))
12437 determine_visibility (decl1);
12439 begin_scope (sk_function_parms, decl1);
12443 if (DECL_DESTRUCTOR_P (decl1)
12444 || (DECL_CONSTRUCTOR_P (decl1)
12445 && targetm.cxx.cdtor_returns_this ()))
12447 cdtor_label = build_decl (input_location,
12448 LABEL_DECL, NULL_TREE, NULL_TREE);
12449 DECL_CONTEXT (cdtor_label) = current_function_decl;
12452 start_fname_decls ();
12454 store_parm_decls (current_function_parms);
12458 /* Like start_preparsed_function, except that instead of a
12459 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12461 Returns 1 on success. If the DECLARATOR is not suitable for a function
12462 (it defines a datum instead), we return 0, which tells
12463 yyparse to report a parse error. */
12466 start_function (cp_decl_specifier_seq *declspecs,
12467 const cp_declarator *declarator,
12472 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12473 if (decl1 == error_mark_node)
12475 /* If the declarator is not suitable for a function definition,
12476 cause a syntax error. */
12477 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12479 error ("invalid function declaration");
12483 if (DECL_MAIN_P (decl1))
12484 /* main must return int. grokfndecl should have corrected it
12485 (and issued a diagnostic) if the user got it wrong. */
12486 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12487 integer_type_node));
12489 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12494 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12498 use_eh_spec_block (tree fn)
12500 return (flag_exceptions && flag_enforce_eh_specs
12501 && !processing_template_decl
12502 && !type_throw_all_p (TREE_TYPE (fn))
12503 /* We insert the EH_SPEC_BLOCK only in the original
12504 function; then, it is copied automatically to the
12506 && !DECL_CLONED_FUNCTION_P (fn)
12507 /* Implicitly-generated constructors and destructors have
12508 exception specifications. However, those specifications
12509 are the union of the possible exceptions specified by the
12510 constructors/destructors for bases and members, so no
12511 unallowed exception will ever reach this function. By
12512 not creating the EH_SPEC_BLOCK we save a little memory,
12513 and we avoid spurious warnings about unreachable
12515 && !DECL_ARTIFICIAL (fn));
12518 /* Store the parameter declarations into the current function declaration.
12519 This is called after parsing the parameter declarations, before
12520 digesting the body of the function.
12522 Also install to binding contour return value identifier, if any. */
12525 store_parm_decls (tree current_function_parms)
12527 tree fndecl = current_function_decl;
12530 /* This is a chain of any other decls that came in among the parm
12531 declarations. If a parm is declared with enum {foo, bar} x;
12532 then CONST_DECLs for foo and bar are put here. */
12533 tree nonparms = NULL_TREE;
12535 if (current_function_parms)
12537 /* This case is when the function was defined with an ANSI prototype.
12538 The parms already have decls, so we need not do anything here
12539 except record them as in effect
12540 and complain if any redundant old-style parm decls were written. */
12542 tree specparms = current_function_parms;
12545 /* Must clear this because it might contain TYPE_DECLs declared
12547 current_binding_level->names = NULL;
12549 /* If we're doing semantic analysis, then we'll call pushdecl
12550 for each of these. We must do them in reverse order so that
12551 they end in the correct forward order. */
12552 specparms = nreverse (specparms);
12554 for (parm = specparms; parm; parm = next)
12556 next = DECL_CHAIN (parm);
12557 if (TREE_CODE (parm) == PARM_DECL)
12559 if (DECL_NAME (parm) == NULL_TREE
12560 || TREE_CODE (parm) != VOID_TYPE)
12563 error ("parameter %qD declared void", parm);
12567 /* If we find an enum constant or a type tag,
12568 put it aside for the moment. */
12569 TREE_CHAIN (parm) = NULL_TREE;
12570 nonparms = chainon (nonparms, parm);
12574 /* Get the decls in their original chain order and record in the
12575 function. This is all and only the PARM_DECLs that were
12576 pushed into scope by the loop above. */
12577 DECL_ARGUMENTS (fndecl) = getdecls ();
12580 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12582 /* Now store the final chain of decls for the arguments
12583 as the decl-chain of the current lexical scope.
12584 Put the enumerators in as well, at the front so that
12585 DECL_ARGUMENTS is not modified. */
12586 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12588 if (use_eh_spec_block (current_function_decl))
12589 current_eh_spec_block = begin_eh_spec_block ();
12593 /* We have finished doing semantic analysis on DECL, but have not yet
12594 generated RTL for its body. Save away our current state, so that
12595 when we want to generate RTL later we know what to do. */
12598 save_function_data (tree decl)
12600 struct language_function *f;
12602 /* Save the language-specific per-function data so that we can
12603 get it back when we really expand this function. */
12604 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12607 f = ggc_alloc_language_function ();
12608 memcpy (f, cp_function_chain, sizeof (struct language_function));
12609 DECL_SAVED_FUNCTION_DATA (decl) = f;
12611 /* Clear out the bits we don't need. */
12612 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12613 f->bindings = NULL;
12614 f->x_local_names = NULL;
12618 /* Set the return value of the constructor (if present). */
12621 finish_constructor_body (void)
12626 if (targetm.cxx.cdtor_returns_this ()
12627 && (! TYPE_FOR_JAVA (current_class_type)))
12629 /* Any return from a constructor will end up here. */
12630 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12632 val = DECL_ARGUMENTS (current_function_decl);
12633 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12634 DECL_RESULT (current_function_decl), val);
12635 /* Return the address of the object. */
12636 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12637 add_stmt (exprstmt);
12641 /* Do all the processing for the beginning of a destructor; set up the
12642 vtable pointers and cleanups for bases and members. */
12645 begin_destructor_body (void)
12647 tree compound_stmt;
12649 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12650 issued an error message. We still want to try to process the
12651 body of the function, but initialize_vtbl_ptrs will crash if
12652 TYPE_BINFO is NULL. */
12653 if (COMPLETE_TYPE_P (current_class_type))
12655 compound_stmt = begin_compound_stmt (0);
12656 /* Make all virtual function table pointers in non-virtual base
12657 classes point to CURRENT_CLASS_TYPE's virtual function
12659 initialize_vtbl_ptrs (current_class_ptr);
12660 finish_compound_stmt (compound_stmt);
12662 /* And insert cleanups for our bases and members so that they
12663 will be properly destroyed if we throw. */
12664 push_base_cleanups ();
12668 /* At the end of every destructor we generate code to delete the object if
12669 necessary. Do that now. */
12672 finish_destructor_body (void)
12676 /* Any return from a destructor will end up here; that way all base
12677 and member cleanups will be run when the function returns. */
12678 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12680 /* In a virtual destructor, we must call delete. */
12681 if (DECL_VIRTUAL_P (current_function_decl))
12684 tree virtual_size = cxx_sizeof (current_class_type);
12688 At the point of definition of a virtual destructor (including
12689 an implicit definition), non-placement operator delete shall
12690 be looked up in the scope of the destructor's class and if
12691 found shall be accessible and unambiguous. */
12692 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12694 /*global_p=*/false,
12695 /*placement=*/NULL_TREE,
12696 /*alloc_fn=*/NULL_TREE);
12698 if_stmt = begin_if_stmt ();
12699 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12700 current_in_charge_parm,
12703 finish_expr_stmt (exprstmt);
12704 finish_then_clause (if_stmt);
12705 finish_if_stmt (if_stmt);
12708 if (targetm.cxx.cdtor_returns_this ())
12712 val = DECL_ARGUMENTS (current_function_decl);
12713 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12714 DECL_RESULT (current_function_decl), val);
12715 /* Return the address of the object. */
12716 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12717 add_stmt (exprstmt);
12721 /* Do the necessary processing for the beginning of a function body, which
12722 in this case includes member-initializers, but not the catch clauses of
12723 a function-try-block. Currently, this means opening a binding level
12724 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12727 begin_function_body (void)
12731 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12734 if (processing_template_decl)
12735 /* Do nothing now. */;
12737 /* Always keep the BLOCK node associated with the outermost pair of
12738 curly braces of a function. These are needed for correct
12739 operation of dwarfout.c. */
12740 keep_next_level (true);
12742 stmt = begin_compound_stmt (BCS_FN_BODY);
12744 if (processing_template_decl)
12745 /* Do nothing now. */;
12746 else if (DECL_DESTRUCTOR_P (current_function_decl))
12747 begin_destructor_body ();
12752 /* Do the processing for the end of a function body. Currently, this means
12753 closing out the cleanups for fully-constructed bases and members, and in
12754 the case of the destructor, deleting the object if desired. Again, this
12755 is only meaningful for [cd]tors, since they are the only functions where
12756 there is a significant distinction between the main body and any
12757 function catch clauses. Handling, say, main() return semantics here
12758 would be wrong, as flowing off the end of a function catch clause for
12759 main() would also need to return 0. */
12762 finish_function_body (tree compstmt)
12764 if (compstmt == NULL_TREE)
12767 /* Close the block. */
12768 finish_compound_stmt (compstmt);
12770 if (processing_template_decl)
12771 /* Do nothing now. */;
12772 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12773 finish_constructor_body ();
12774 else if (DECL_DESTRUCTOR_P (current_function_decl))
12775 finish_destructor_body ();
12778 /* Given a function, returns the BLOCK corresponding to the outermost level
12779 of curly braces, skipping the artificial block created for constructor
12783 outer_curly_brace_block (tree fndecl)
12785 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12786 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12787 /* Skip the artificial function body block. */
12788 block = BLOCK_SUBBLOCKS (block);
12792 /* If FNDECL is a class's key method, add the class to the list of
12793 keyed classes that should be emitted. */
12796 record_key_method_defined (tree fndecl)
12798 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12799 && DECL_VIRTUAL_P (fndecl)
12800 && !processing_template_decl)
12802 tree fnclass = DECL_CONTEXT (fndecl);
12803 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12804 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12808 /* Subroutine of finish_function.
12809 Save the body of constexpr functions for possible
12810 future compile time evaluation. */
12813 maybe_save_function_definition (tree fun)
12815 if (!processing_template_decl
12816 && DECL_DECLARED_CONSTEXPR_P (fun)
12817 && !DECL_CLONED_FUNCTION_P (fun))
12818 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
12821 /* Finish up a function declaration and compile that function
12822 all the way to assembler language output. The free the storage
12823 for the function definition.
12825 FLAGS is a bitwise or of the following values:
12827 We just finished processing the body of an in-class inline
12828 function definition. (This processing will have taken place
12829 after the class definition is complete.) */
12832 finish_function (int flags)
12834 tree fndecl = current_function_decl;
12835 tree fntype, ctype = NULL_TREE;
12836 int inclass_inline = (flags & 2) != 0;
12838 /* When we get some parse errors, we can end up without a
12839 current_function_decl, so cope. */
12840 if (fndecl == NULL_TREE)
12841 return error_mark_node;
12843 if (c_dialect_objc ())
12844 objc_finish_function ();
12846 gcc_assert (!defer_mark_used_calls);
12847 defer_mark_used_calls = true;
12849 record_key_method_defined (fndecl);
12851 fntype = TREE_TYPE (fndecl);
12853 /* TREE_READONLY (fndecl) = 1;
12854 This caused &foo to be of type ptr-to-const-function
12855 which then got a warning when stored in a ptr-to-function variable. */
12857 gcc_assert (building_stmt_tree ());
12858 /* The current function is being defined, so its DECL_INITIAL should
12859 be set, and unless there's a multiple definition, it should be
12860 error_mark_node. */
12861 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12863 /* For a cloned function, we've already got all the code we need;
12864 there's no need to add any extra bits. */
12865 if (!DECL_CLONED_FUNCTION_P (fndecl))
12867 if (DECL_MAIN_P (current_function_decl))
12871 /* Make it so that `main' always returns 0 by default (or
12874 stmt = finish_return_stmt (integer_one_node);
12876 stmt = finish_return_stmt (integer_zero_node);
12878 /* Hack. We don't want the middle-end to warn that this
12879 return is unreachable, so put the statement on the
12882 location_t linezero = linemap_line_start (line_table, 0, 1);
12883 SET_EXPR_LOCATION (stmt, linezero);
12887 if (use_eh_spec_block (current_function_decl))
12888 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12889 (TREE_TYPE (current_function_decl)),
12890 current_eh_spec_block);
12893 /* If we're saving up tree structure, tie off the function now. */
12894 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12896 finish_fname_decls ();
12898 /* If this function can't throw any exceptions, remember that. */
12899 if (!processing_template_decl
12900 && !cp_function_chain->can_throw
12901 && !flag_non_call_exceptions
12902 && !decl_replaceable_p (fndecl))
12903 TREE_NOTHROW (fndecl) = 1;
12905 /* This must come after expand_function_end because cleanups might
12906 have declarations (from inline functions) that need to go into
12907 this function's blocks. */
12909 /* If the current binding level isn't the outermost binding level
12910 for this function, either there is a bug, or we have experienced
12911 syntax errors and the statement tree is malformed. */
12912 if (current_binding_level->kind != sk_function_parms)
12914 /* Make sure we have already experienced errors. */
12915 gcc_assert (errorcount);
12917 /* Throw away the broken statement tree and extra binding
12919 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12921 while (current_binding_level->kind != sk_function_parms)
12923 if (current_binding_level->kind == sk_class)
12924 pop_nested_class ();
12926 poplevel (0, 0, 0);
12929 poplevel (1, 0, 1);
12931 /* Statements should always be full-expressions at the outermost set
12932 of curly braces for a function. */
12933 gcc_assert (stmts_are_full_exprs_p ());
12935 /* Save constexpr function body before it gets munged by
12936 the NRV transformation. */
12937 maybe_save_function_definition (fndecl);
12939 /* Set up the named return value optimization, if we can. Candidate
12940 variables are selected in check_return_expr. */
12941 if (current_function_return_value)
12943 tree r = current_function_return_value;
12946 if (r != error_mark_node
12947 /* This is only worth doing for fns that return in memory--and
12948 simpler, since we don't have to worry about promoted modes. */
12949 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12950 /* Only allow this for variables declared in the outer scope of
12951 the function so we know that their lifetime always ends with a
12952 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12953 we were to do this optimization in tree-ssa. */
12954 && (outer = outer_curly_brace_block (fndecl))
12955 && chain_member (r, BLOCK_VARS (outer)))
12956 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12958 current_function_return_value = NULL_TREE;
12961 /* Remember that we were in class scope. */
12962 if (current_class_name)
12963 ctype = current_class_type;
12965 /* Must mark the RESULT_DECL as being in this function. */
12966 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12968 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12969 to the FUNCTION_DECL node itself. */
12970 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12972 /* Save away current state, if appropriate. */
12973 if (!processing_template_decl)
12974 save_function_data (fndecl);
12976 /* Complain if there's just no return statement. */
12977 if (warn_return_type
12978 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12979 && !dependent_type_p (TREE_TYPE (fntype))
12980 && !current_function_returns_value && !current_function_returns_null
12981 /* Don't complain if we abort or throw. */
12982 && !current_function_returns_abnormally
12983 /* Don't complain if we are declared noreturn. */
12984 && !TREE_THIS_VOLATILE (fndecl)
12985 && !DECL_NAME (DECL_RESULT (fndecl))
12986 && !TREE_NO_WARNING (fndecl)
12987 /* Structor return values (if any) are set by the compiler. */
12988 && !DECL_CONSTRUCTOR_P (fndecl)
12989 && !DECL_DESTRUCTOR_P (fndecl))
12991 warning (OPT_Wreturn_type,
12992 "no return statement in function returning non-void");
12993 TREE_NO_WARNING (fndecl) = 1;
12996 /* Store the end of the function, so that we get good line number
12997 info for the epilogue. */
12998 cfun->function_end_locus = input_location;
13000 /* Complain about parameters that are only set, but never otherwise used. */
13001 if (warn_unused_but_set_parameter
13002 && !processing_template_decl
13003 && errorcount == unused_but_set_errorcount
13004 && !DECL_CLONED_FUNCTION_P (fndecl))
13008 for (decl = DECL_ARGUMENTS (fndecl);
13010 decl = DECL_CHAIN (decl))
13011 if (TREE_USED (decl)
13012 && TREE_CODE (decl) == PARM_DECL
13013 && !DECL_READ_P (decl)
13014 && DECL_NAME (decl)
13015 && !DECL_ARTIFICIAL (decl)
13016 && !TREE_NO_WARNING (decl)
13017 && !DECL_IN_SYSTEM_HEADER (decl)
13018 && TREE_TYPE (decl) != error_mark_node
13019 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13020 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13021 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13022 warning (OPT_Wunused_but_set_parameter,
13023 "parameter %q+D set but not used", decl);
13024 unused_but_set_errorcount = errorcount;
13027 /* Genericize before inlining. */
13028 if (!processing_template_decl)
13030 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13031 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13032 cp_genericize (fndecl);
13033 /* Clear out the bits we don't need. */
13034 f->x_current_class_ptr = NULL;
13035 f->x_current_class_ref = NULL;
13036 f->x_eh_spec_block = NULL;
13037 f->x_in_charge_parm = NULL;
13038 f->x_vtt_parm = NULL;
13039 f->x_return_value = NULL;
13040 f->bindings = NULL;
13041 f->extern_decl_map = NULL;
13043 /* Clear out the bits we don't need. */
13044 local_names = NULL;
13046 /* We're leaving the context of this function, so zap cfun. It's still in
13047 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13049 current_function_decl = NULL;
13051 /* If this is an in-class inline definition, we may have to pop the
13052 bindings for the template parameters that we added in
13053 maybe_begin_member_template_processing when start_function was
13055 if (inclass_inline)
13056 maybe_end_member_template_processing ();
13058 /* Leave the scope of the class. */
13060 pop_nested_class ();
13065 current_function_decl = NULL_TREE;
13067 defer_mark_used_calls = false;
13068 if (deferred_mark_used_calls)
13073 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13075 VEC_free (tree, gc, deferred_mark_used_calls);
13081 /* Create the FUNCTION_DECL for a function definition.
13082 DECLSPECS and DECLARATOR are the parts of the declaration;
13083 they describe the return type and the name of the function,
13084 but twisted together in a fashion that parallels the syntax of C.
13086 This function creates a binding context for the function body
13087 as well as setting up the FUNCTION_DECL in current_function_decl.
13089 Returns a FUNCTION_DECL on success.
13091 If the DECLARATOR is not suitable for a function (it defines a datum
13092 instead), we return 0, which tells yyparse to report a parse error.
13094 May return void_type_node indicating that this method is actually
13095 a friend. See grokfield for more details.
13097 Came here with a `.pushlevel' .
13099 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13100 CHANGES TO CODE IN `grokfield'. */
13103 grokmethod (cp_decl_specifier_seq *declspecs,
13104 const cp_declarator *declarator, tree attrlist)
13106 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13109 if (fndecl == error_mark_node)
13110 return error_mark_node;
13112 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13114 error ("invalid member function declaration");
13115 return error_mark_node;
13119 cplus_decl_attributes (&fndecl, attrlist, 0);
13121 /* Pass friends other than inline friend functions back. */
13122 if (fndecl == void_type_node)
13125 if (DECL_IN_AGGR_P (fndecl))
13127 if (DECL_CLASS_SCOPE_P (fndecl))
13128 error ("%qD is already defined in class %qT", fndecl,
13129 DECL_CONTEXT (fndecl));
13130 return error_mark_node;
13133 check_template_shadow (fndecl);
13135 DECL_DECLARED_INLINE_P (fndecl) = 1;
13136 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13138 /* We process method specializations in finish_struct_1. */
13139 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13141 fndecl = push_template_decl (fndecl);
13142 if (fndecl == error_mark_node)
13146 if (! DECL_FRIEND_P (fndecl))
13148 if (DECL_CHAIN (fndecl))
13150 fndecl = copy_node (fndecl);
13151 TREE_CHAIN (fndecl) = NULL_TREE;
13155 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13157 DECL_IN_AGGR_P (fndecl) = 1;
13162 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13163 we can lay it out later, when and if its type becomes complete. */
13166 maybe_register_incomplete_var (tree var)
13168 gcc_assert (TREE_CODE (var) == VAR_DECL);
13170 /* Keep track of variables with incomplete types. */
13171 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13172 && DECL_EXTERNAL (var))
13174 tree inner_type = TREE_TYPE (var);
13176 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13177 inner_type = TREE_TYPE (inner_type);
13178 inner_type = TYPE_MAIN_VARIANT (inner_type);
13180 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13181 /* RTTI TD entries are created while defining the type_info. */
13182 || (TYPE_LANG_SPECIFIC (inner_type)
13183 && TYPE_BEING_DEFINED (inner_type)))
13186 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13188 iv->incomplete_type = inner_type;
13193 /* Called when a class type (given by TYPE) is defined. If there are
13194 any existing VAR_DECLs whose type has been completed by this
13195 declaration, update them now. */
13198 complete_vars (tree type)
13201 incomplete_var *iv;
13203 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13205 if (same_type_p (type, iv->incomplete_type))
13207 tree var = iv->decl;
13208 tree type = TREE_TYPE (var);
13209 /* Complete the type of the variable. The VAR_DECL itself
13210 will be laid out in expand_expr. */
13211 complete_type (type);
13212 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13213 /* Remove this entry from the list. */
13214 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13220 /* Check for pending declarations which may have abstract type. */
13221 complete_type_check_abstract (type);
13224 /* If DECL is of a type which needs a cleanup, build and return an
13225 expression to perform that cleanup here. Return NULL_TREE if no
13226 cleanup need be done. */
13229 cxx_maybe_build_cleanup (tree decl)
13235 /* Assume no cleanup is required. */
13236 cleanup = NULL_TREE;
13238 if (error_operand_p (decl))
13241 /* Handle "__attribute__((cleanup))". We run the cleanup function
13242 before the destructor since the destructor is what actually
13243 terminates the lifetime of the object. */
13244 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13251 /* Get the name specified by the user for the cleanup function. */
13252 id = TREE_VALUE (TREE_VALUE (attr));
13253 /* Look up the name to find the cleanup function to call. It is
13254 important to use lookup_name here because that is what is
13255 used in c-common.c:handle_cleanup_attribute when performing
13256 initial checks on the attribute. Note that those checks
13257 include ensuring that the function found is not an overloaded
13258 function, or an object with an overloaded call operator,
13259 etc.; we can rely on the fact that the function found is an
13260 ordinary FUNCTION_DECL. */
13261 fn = lookup_name (id);
13262 arg = build_address (decl);
13264 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13267 /* Handle ordinary C++ destructors. */
13268 type = TREE_TYPE (decl);
13269 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13271 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13272 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13273 && CLASSTYPE_VBASECLASSES (type));
13277 if (TREE_CODE (type) == ARRAY_TYPE)
13280 addr = build_address (decl);
13282 /* Optimize for space over speed here. */
13283 if (!has_vbases || flag_expensive_optimizations)
13284 flags |= LOOKUP_NONVIRTUAL;
13286 call = build_delete (TREE_TYPE (addr), addr,
13287 sfk_complete_destructor, flags, 0);
13289 cleanup = build_compound_expr (input_location, cleanup, call);
13297 /* When a stmt has been parsed, this function is called. */
13304 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13305 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13306 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13309 static_fn_type (tree memfntype)
13314 if (TYPE_PTRMEMFUNC_P (memfntype))
13315 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13316 if (POINTER_TYPE_P (memfntype)
13317 || TREE_CODE (memfntype) == FUNCTION_DECL)
13318 memfntype = TREE_TYPE (memfntype);
13319 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13321 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13322 args = TYPE_ARG_TYPES (memfntype);
13323 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13324 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13325 fntype = (cp_build_type_attribute_variant
13326 (fntype, TYPE_ATTRIBUTES (memfntype)));
13327 fntype = (build_exception_variant
13328 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13332 /* DECL was originally constructed as a non-static member function,
13333 but turned out to be static. Update it accordingly. */
13336 revert_static_member_fn (tree decl)
13338 TREE_TYPE (decl) = static_fn_type (decl);
13340 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13341 error ("static member function %q#D declared with type qualifiers", decl);
13343 if (DECL_ARGUMENTS (decl))
13344 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13345 DECL_STATIC_FUNCTION_P (decl) = 1;
13348 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13349 one of the language-independent trees. */
13351 enum cp_tree_node_structure_enum
13352 cp_tree_node_structure (union lang_tree_node * t)
13354 switch (TREE_CODE (&t->generic))
13356 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13357 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13358 case OVERLOAD: return TS_CP_OVERLOAD;
13359 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13360 case PTRMEM_CST: return TS_CP_PTRMEM;
13361 case BASELINK: return TS_CP_BASELINK;
13362 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13363 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13364 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13365 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13366 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13367 default: return TS_CP_GENERIC;
13371 /* Build the void_list_node (void_type_node having been created). */
13373 build_void_list_node (void)
13375 tree t = build_tree_list (NULL_TREE, void_type_node);
13380 cp_missing_noreturn_ok_p (tree decl)
13382 /* A missing noreturn is ok for the `main' function. */
13383 return DECL_MAIN_P (decl);
13386 /* Return the COMDAT group into which DECL should be placed. */
13389 cxx_comdat_group (tree decl)
13393 /* Virtual tables, construction virtual tables, and virtual table
13394 tables all go in a single COMDAT group, named after the primary
13396 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13397 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13398 /* For all other DECLs, the COMDAT group is the mangled name of the
13399 declaration itself. */
13402 while (DECL_THUNK_P (decl))
13404 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13405 into the same section as the target function. In that case
13406 we must return target's name. */
13407 tree target = THUNK_TARGET (decl);
13408 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13409 && DECL_SECTION_NAME (target) != NULL
13410 && DECL_ONE_ONLY (target))
13415 name = DECL_ASSEMBLER_NAME (decl);
13421 #include "gt-cp-decl.h"